US3866510A - Self-tapping threaded bushings - Google Patents

Self-tapping threaded bushings Download PDF

Info

Publication number
US3866510A
US3866510A US329952A US32995273A US3866510A US 3866510 A US3866510 A US 3866510A US 329952 A US329952 A US 329952A US 32995273 A US32995273 A US 32995273A US 3866510 A US3866510 A US 3866510A
Authority
US
United States
Prior art keywords
bushing
bevel
crests
thread
frontal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US329952A
Inventor
Carl B H Eibes
Christian Eibes
Carl-Herwig Eibes
Maria-Theresi Wagner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EIBES CARL H
WAGNER MARIA THERESI
Original Assignee
EIBES CARL H
WAGNER MARIA THERESI
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by EIBES CARL H, WAGNER MARIA THERESI filed Critical EIBES CARL H
Priority to US329952A priority Critical patent/US3866510A/en
Application granted granted Critical
Publication of US3866510A publication Critical patent/US3866510A/en
Priority to US05/593,404 priority patent/USRE28907E/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16BDEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B37/00Nuts or like thread-engaging members
    • F16B37/12Nuts or like thread-engaging members with thread-engaging surfaces formed by inserted coil-springs, discs, or the like; Independent pieces of wound wire used as nuts; Threaded inserts for holes
    • F16B37/122Threaded inserts, e.g. "rampa bolts"
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21HMAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H3/00Making helical bodies or bodies having parts of helical shape
    • B21H3/02Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling
    • B21H3/027Rolling of self-tapping screws
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23GTHREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
    • B23G7/00Forming thread by means of tools similar both in form and in manner of use to thread-cutting tools, but without removing any material
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16BDEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/001Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed
    • F16B25/0031Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed the screw being designed to be screwed into different materials, e.g. a layered structure or through metallic and wooden parts
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16BDEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/0036Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
    • F16B25/0042Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw
    • F16B25/0052Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw the ridge having indentations, notches or the like in order to improve the cutting behaviour

Definitions

  • Threaded bushings possessing a self-tapping male thread are usually manufactured from metals, such as steel, bronze or brass, and serve to fasten screws, bolts or similar connecting elements within or to structural members or work pieces which have a lesser hardness than the bushing material and can consist for example of soft steel or iron, wood, plastics, light metals and the like. It is the purpose of such threaded bushings, also called liners, to create within a relatively soft work piece an internal thread possessing relatively great strength. This strength is attained not only by this thread of substantially greater diameter relative to the internal thread diameter of the bushing but also by avoidance of a severance of the fibers of the material, and it is one of the purposes of the invention to avoid this disadvantage.
  • the invention is designed to solve several problems:
  • the internal thread, produced within the bore of the work piece, is to be produced partially without cutting; for example, by notching, and partially by cutting, i.e., by metal removal;
  • the entering torque of the threaded bushing is to be kept relatively low, while the return torque or restoring moment should be relatively high;
  • the costs for manufacturing the threaded bushing should be as low as possible.
  • Threaded bushings of various types and designs are known.
  • threaded bushings which provide, at least over a portion of the length of the bushing, grooves or slots which run substantially parallel to its axis and which form cutting edges together with the webs-of the thread, and with the outside of the penetrating end of the bushing usually designed conically.
  • These slots or grooves of the known threaded bushings are usually produced, following the manufacture of the male thread of the bushing, by milling, grinding or the like. The method of manufacture is very costly.
  • threaded bushings of this type will produce the internal thread within the bore of the work piece almost exclusively by cutting.
  • the forming of the thread by cutting in the manner described has the disadvantage that the fibers of the work piece material are severed, thereby lowering its stability and especially its shearing strength.
  • the invention is based on a threaded bushing possessing bevels, grooves, or the like which intersect the male thread and form recesses within the originally round contour, and which extend axially at least over several threads but preferably over the total axial length of the threaded bushing, and whereby between the bevel, groove, or the like on the one hand and the threads on the other hand (i.e., at the crests of the thread) faces or frontal areas are created which will produce female threads within the bore of the work piece, the novel and inventive feature being that the frontal areas of each thread are bent or curved up, relative to the original contour, and are formed concavely, similar to a shovel or spoon.
  • frontal areas possess edges which are designed in the form of not too sharply edged cutting edges, or edges which will help to increase the restoring moment.
  • These frontal areas are produced by a male threadrolling process and appropriate deformation of material; that is, they are formed by raising from the original surface or contour of the bevel or the like.
  • this is accomplishing by furnishing a profile bar which has several axially extending bevels distributed around its contour (the bevels preferably being axially parallel), with a male thread by means of rolling tools, whereby the characteristics of the rolling process, such as rolling pressure, rolling depth, rolling advance, shape and material of the rolling tool, and the like, are set and selected in such manner that the frontal area, created in the zone of transition between an individual crest of the thread and an individual bevel, is curved at the thread end to a greater or lesser degree relative to the original plane or contour of the bevel, or is raised due to the deformation of material, and that the edges of said frontal areas project above the areas with the edges not too sharply edged.
  • the characteristics of the rolling process such as rolling pressure, rolling depth, rolling advance, shape and material of the rolling tool, and the like
  • the not too sharply edged design is a decisive feature for the creation of a powerful restoring moment, but it leads also to the other desired effect, namely that upon entering and turning of the bushing the internal thread of the work piece is being formed only partially by cutting but mainly by deformation without cutting.
  • Preferred basic material to be utilized is profile material, for example bars or tubes, produced by drawing. Such profile material will already possess bevels in flat, convex or concave form.
  • the invention proposes further that during or after the rolling of the male thread, there are produced in a manner known per se, adjacent to one or both ends of the threaded bushing, conically beveled male thread profiles, their outer diameters tapering off toward the ends.
  • the invention makes it feasible to select one or the other of a threaded bushing to be entered and turned in the smooth bore of a work piece, or to fasten it within the work piece, utilizing the greater or lesser curved frontal area as cutting surface, or the lesser or greater curved frontal area as means to increase the restoring torque.
  • the direction of rolling at the creation of the male thread of the bushing and the direction of turning of the bushing into the work piece will either coincide or be opposite to each other, and accordingly the more heavily curved frontal area will act as thread-forming means, and the lesser curved frontal area as means to increase the restoring torque, or vice-versa.
  • the invention proposes further that the boring of the threaded bushing and the furnishing of the female thread is accomplished in a manner known per se either before or after the thread-rolling.
  • each individual crest of a thread possesses two frontal areas, and according to the invention the second area formed in the direction of rolling has a lesser pitch than the frontal area designed for cutting, but even the latter is still kept sufficiently concave or spoon-shaped in order to attain a restoring torque which is greatly improved over the designs known heretofore. It is also possible, under special circumstances, to interchange the functions of the two frontal areas so that the flatter area will act as thread-forming means when entering and turning in the threaded bushing, with the more pronouncedly curved frontal area increasing the exit torque during return movement.
  • Manufacture is accomplished by a process covered by the invention, preferably by thread-rolling. It was found unexpectedly and surprisingly that in case of basic material possessing the bevels or grooves at full length, anbd proper selection of the rolling surface pressure as well as the other characteristics of the rolling process, there are created by the thread-rolling curved frontal areas at the crests of the thread, that is within the zone of transition between the crest of the thread and the bevel or groove, a significant feature being that through such rolling process, correctly set and controlled, said raised edges of the frontal area are produced.
  • the direction of rolling should correspond to the direction of turning in of the bushing if it is desired to use the steeper or more pronouncedly curved three-forming element (the frontal areas) for the creation of the internal thread within the smooth bore of the work piece; if it is desired, in case of special circumstances, to employ the lesser curved frontal areas as the thread-forming areas, the opposite rolling direction will be chosen. As ready mentioned, in the latter case the restoring moment is thus increased still further.
  • the ratio between the internal thread forming by cutting and by shaping without cutting will vary, depending for example on the steepness or height of the frontal area curvature, the sharpness of the edges of the frontal area, and other characteristics.
  • the invention will have the effect of attaining a sufficient deformation of material without cutting, following, timewise, the cutting phase of the thread-forming process, so that compacting of the material as well as an improvement in the fiber structure of the material of the work piece can be attained.
  • Such deformation of the material has the additional advantage that the inserted threaded bushing will be seated more strongly and securely in the work piece.
  • edges of the frontal areas are not especially sharp, as can be definitely accomplished by means of a properly controlled rolling process, any danger of separating the fibers of the work piece material will be eliminated.
  • FIG. 4 a plan view of a completed threaded bushing
  • FIG. 5 a plan view of another species of a completed bushing
  • FIG. 6 a completed threaded bushing in perspective
  • FIG. 7 an enlargement of the area VII depicted in FIG. 6;
  • FIG. 8 a section along line VIII-VIII of FIG. 7;
  • FIG. 9 a section along line IX IX of FIG. 7;
  • FIG. 10 a section along line X X of FIG. 7;
  • FIG. 1 shows rod I, originally a round bar, provided with flat bevels 2, spaced uniformly at the contour and running axially parallel, that is, in a longitudinal direction of the rod.
  • FIG. 2 shows a substantially identical rod 1, its bevels 2 shaped slightly in convex form, but otherwise identical with bevels 2.
  • the bevels 2" are shaped concavely at the otherwise identical rod 1'', running again in longitudinal direction, axially parallel.
  • the rod can be hollowed, whereby the inner wall 3 can be provided with the required internal thread at the proper stage of the manufacturing process.
  • FIG. 4 shows a completed threaded bushing B in plan view, where the direction of turning is identical with the direction of rolling, both running in clockwise direction.
  • the rolling direction illustrated, creating the male thread causes the above-discussed bulging, that is, the formation of curved-up or bent-up cutting edges 13, created by clockwise displacement of material.
  • the rolling process also has the peculiar consequence that there will rise in the other direction, that is, opposite to the rolling direction, a less pronounced curvature at 14, which in this case represents the restoring edge.
  • FIG. 6 shows the tapering of the lower threads within area 12, a feature which is known per se and which can be accomplished for example by proper turning or grinding.
  • the preferred basic material is a rod, manufactured by drawing and formed as shown in FIGS. 1-3.
  • a significant feature of the invention is the fact that the frontal areas l3-as well as the opposite areas 14, created at the intersections between the bevels 2, the flanks a and 15b and the crests 15 of each thread at the zone of transition toward the bevel 2 or the like, have a concave shape, similar to a spoon, for example, an internal surface in the form of a spade or scoop; in other words, areas are curved inwards spherically and cup-like. Also, the roots 11 between successive threads are essentially discontinuous at bevel 2.
  • FIGS. 7 and 8 illustrate these points in a particularly clear manner.
  • the frontal areas 13 possess a spherical concavity of the frontal edge or area of the crest 15 of the thread.
  • the frontal areas 14 are shaped in the same manner although less pronouncedly.
  • the edges 13 and 13 of said frontal areas I3 are formed at the intersection of flanks 15a and 15b with bevel 2 and are upwardly forced, narrow crests which act in a certain manner as cutting edges, that is, metal-removing edges; however, since they do not possess the sharpness of a knife, they will fulfill the desired effect of not only removing metal by cutting but to begin, and at least carry out partially, the process of deforming material during the formation of the'female thread within the work piece.
  • the edges or rims 14' and 14 of the frontal areas M will form not too sharp cutting edges, so that these frontal areas 14 will increase significantly the restoring moment during the back-out, assuming that the direction of entry and turning corresponds to the arrow E in FIG. 7.
  • the frontal area I4 will be the area forming the female thread, and areas 13 the back-out areas, causing a particularly great increase in the restoring moment.
  • FIGS. 9 and I0 illustrate the sectional views along the lines depicted in FIG. 7. It should be noted that within the lower region 12 (see FIG. 6), the crests of the thread are flattened, that is, designed in tapered shape, as indicated by the broken line 17 in FIG. 10 (note shown in FIG. 9).
  • FIG. 11 shows how a threaded bushing B is introduced and turned in work piece 19 in direction E by a turning tool 18 of known construction, the work piece possessing a known smooth bore 20, the bore diameter being smaller than the widest part of the outer diameter of bushing B.
  • the bushing B illustrated in FIG. 11, has for example the thread-forming frontal areas 13 and the back-out areas 14, as shown in FIG. 6.
  • the bushings of the present invention are made from a length of rod of basic circular cross section which has been provided with longitudinal planar bevels generally as shown, for example, in FIG. I.
  • the longitudinal planar bevels are located on chords of the basic circular cross section of the rod which are at a depth within the circular cross section sufficient to ensure that subsequent thread-rolling on the circular cross section does not produce any threads whose roots extend completely across the bevelled portions.
  • the thread root radius is chosen to be at least as large as the minimum radius between the center of the circular cross section and the planar bevel.
  • Thread rolling is properly carried out by the wellknown means of three rollers spaced circumferentially about the rod, and preferably the direction of thread rolling is clockwise, that is, in the direction of turning of the bushing into the workpiece.
  • the .thread rolling rollers are adjusted as required by the particular thread geometry and the rod material so that the conventional thread rolling surfaces do not roll any thread roots completely across the area in which the planar bevels are located on the rod, in a manner that will be appreciated by those skilled in the thread-rolling art.
  • the thenthreaded rod is cut into a plurality of pieces each of which comprises a single bushing.
  • Also covered by the invention is the manufacture of threaded bushings possessing one or more of the above discussed features in that manner that first pieces of bushing length are cut off from a rod or tube section possessing a round contour, the pieces are then provided with bevels (2,2) and with a male thread by rolling, the internal thread being created in usual manner.
  • a threaded self-tapping bushing adapted to be secured to a workpiece and comprising,
  • an elongate member having helical male threads extending over at least a portion of its axial length said threads having crests, roots between said crests, and flanks extending from said crests to said roots on either side of said crests;
  • said member having at least one axially extending bevel intersecting a plurality of successive threads, the crests and flanks of each said male thread at their intersection with said bevel defining frontal areas on either side of said bevel which are concave both along the circumferential direction of each said male thread and transversely thereto along the axial direction of the bushing, each said bevel being approximately as deep as the roots between the crests to ensure that the roots between successive crests are essentially discontinuous at each bevelled portion, each said frontal area providing cutting edges along at least a part of its periphery as defined by said crest, flanks, and bevel,

Abstract

The disclosure relates to a threaded bushing which, upon entering and turning in the initially smooth bore of the work piece, will form through its own male thread the corresponding internal thread within the wall of the work piece bore. The bushing is formed with one or more exterior bevels or grooves which extend axially over at least several threads and intersect such threads to form spoon or cup-shaped frontal areas where each bevel or groove merges into a respective thread.

Description

United States Patent Eibes, deceased et al.
[11 3,866,510 ['45] Feb. 18,1975
[ SELF-TAPPING THREADED BUSHINGS [76] Inventors: Carl B. H. Eibes, deceased, late of Dr. Carl-Eibes-Str. ll, Schnaittenback, Germany by Ursula Eibes, nee Waschau; Christian Eibes, Dr. Carl-Eibes-Strt 11, Schnaittenback, Germany;
Carl-Herwig Eibes, Grunewaldstra. 30, BerlinSchoneberg, Germany; Maria-Theresia Wagner, nee Eibes, Hans Klopferweb Nr. 1, Amberg, Germany legal heirs Feb. 5, 1973 [21] Appl. No.: 329,952
Related US. Application Data [60] Continuation of Ser. No. 125,260, March 17, 1971, abandoned, which is a division of Ser. No. 733,562, May 13, 1968, Pat. No. 3,597,781.
[22] Filed:
[52] US. Cl. 85/47 [51] Int. Cl. Fl6b 25/00 [58] Field of Search 85/47, 48
[56] References Cited UNITED STATES PATENTS Muenchinger 85/47 3,209,383 lO/l965 Carlson 85/47 3,45l,080 6/1969 McIntyre et al. .r 85/47 FOREIGN PATENTS OR APPLICATIONS 843,129 8/1960 Australia 85/47 Primary Examiner-Edward C. Allen Attorney, Agent, or FirmPollock, Philpitt & Vande Sande [5 7] ABSTRACT The disclosure relates to a threaded bushing which, upon entering and turning in the initially smooth bore of the work piece, will form through its own male thread the corresponding internal thread within the wall of the work piece bore. The bushing is formed with one or more exterior bevels or grooves which extend axially over at least several threads and intersect such threads to form spoon or cup-shaped frontal areas where each bevel or groove merges into a respective thread.
3 Claims, 11 Drawing Figures mmnurw 2.866510 SHEET 1 OF 5 F 16.4 was CA1 H, Eibu3eeeas 1 y sula. Eilms, qei Wasahau C area/ Eibes' s IN V EN TOR.
SELF-TAPPING THREADED BUSHINGS This is a continuation of Ser. No. 125,260, filed Mar. 17, 1971, and now abandoned, which was a division of application Ser. No. 733,562, filed May 13, 1968, and now US. Pat. No. 3,597,781, issued Aug. 10, 1971.
BACKGROUND OF THE INVENTION Threaded bushings possessing a self-tapping male thread are usually manufactured from metals, such as steel, bronze or brass, and serve to fasten screws, bolts or similar connecting elements within or to structural members or work pieces which have a lesser hardness than the bushing material and can consist for example of soft steel or iron, wood, plastics, light metals and the like. It is the purpose of such threaded bushings, also called liners, to create within a relatively soft work piece an internal thread possessing relatively great strength. This strength is attained not only by this thread of substantially greater diameter relative to the internal thread diameter of the bushing but also by avoidance of a severance of the fibers of the material, and it is one of the purposes of the invention to avoid this disadvantage.
The invention is designed to solve several problems:
1. The internal thread, produced within the bore of the work piece, is to be produced partially without cutting; for example, by notching, and partially by cutting, i.e., by metal removal;
2. The entering torque of the threaded bushing is to be kept relatively low, while the return torque or restoring moment should be relatively high;
3. The costs for manufacturing the threaded bushing should be as low as possible.
Self-tapping threaded bushings of various types and designs are known. For example, there exist threaded bushings which provide, at least over a portion of the length of the bushing, grooves or slots which run substantially parallel to its axis and which form cutting edges together with the webs-of the thread, and with the outside of the penetrating end of the bushing usually designed conically. These slots or grooves of the known threaded bushings are usually produced, following the manufacture of the male thread of the bushing, by milling, grinding or the like. The method of manufacture is very costly. Furthermore, threaded bushings of this typewill produce the internal thread within the bore of the work piece almost exclusively by cutting. The forming of the thread by cutting in the manner described has the disadvantage that the fibers of the work piece material are severed, thereby lowering its stability and especially its shearing strength.
SUMMARY OF THE INVENTION In order to solve the above-descussed problems. the invention is based on a threaded bushing possessing bevels, grooves, or the like which intersect the male thread and form recesses within the originally round contour, and which extend axially at least over several threads but preferably over the total axial length of the threaded bushing, and whereby between the bevel, groove, or the like on the one hand and the threads on the other hand (i.e., at the crests of the thread) faces or frontal areas are created which will produce female threads within the bore of the work piece, the novel and inventive feature being that the frontal areas of each thread are bent or curved up, relative to the original contour, and are formed concavely, similar to a shovel or spoon.
Particularly significant in connection with the threaded bushing proposed by the invention is the point that the frontal areas of the thread, facing each other from both sides ofa bevel, are bent or curved up at dissimilar magnitudes relative to the original contour, and that they are designed in the shape of a shovel or spoon.
Another specific characteristic, significant in connection with the invention, of these frontal areas is the fact that they possess edges which are designed in the form of not too sharply edged cutting edges, or edges which will help to increase the restoring moment. These frontal areas are produced by a male threadrolling process and appropriate deformation of material; that is, they are formed by raising from the original surface or contour of the bevel or the like.
According to the invention, this is accomplishing by furnishing a profile bar which has several axially extending bevels distributed around its contour (the bevels preferably being axially parallel), with a male thread by means of rolling tools, whereby the characteristics of the rolling process, such as rolling pressure, rolling depth, rolling advance, shape and material of the rolling tool, and the like, are set and selected in such manner that the frontal area, created in the zone of transition between an individual crest of the thread and an individual bevel, is curved at the thread end to a greater or lesser degree relative to the original plane or contour of the bevel, or is raised due to the deformation of material, and that the edges of said frontal areas project above the areas with the edges not too sharply edged. The not too sharply edged design is a decisive feature for the creation of a powerful restoring moment, but it leads also to the other desired effect, namely that upon entering and turning of the bushing the internal thread of the work piece is being formed only partially by cutting but mainly by deformation without cutting.
Preferred basic material to be utilized is profile material, for example bars or tubes, produced by drawing. Such profile material will already possess bevels in flat, convex or concave form.
The invention proposes further that during or after the rolling of the male thread, there are produced in a manner known per se, adjacent to one or both ends of the threaded bushing, conically beveled male thread profiles, their outer diameters tapering off toward the ends. By making the threaded bushing pointed at both ends, the invention makes it feasible to select one or the other of a threaded bushing to be entered and turned in the smooth bore of a work piece, or to fasten it within the work piece, utilizing the greater or lesser curved frontal area as cutting surface, or the lesser or greater curved frontal area as means to increase the restoring torque.
The direction of rolling at the creation of the male thread of the bushing and the direction of turning of the bushing into the work piece will either coincide or be opposite to each other, and accordingly the more heavily curved frontal area will act as thread-forming means, and the lesser curved frontal area as means to increase the restoring torque, or vice-versa.
The invention proposes further that the boring of the threaded bushing and the furnishing of the female thread is accomplished in a manner known per se either before or after the thread-rolling.
If applicable, it is further proposed that in case of a threaded bushing made of steel the male thread or the entire bushing is tempered after the thread-rolling.
It has been found that such concave or spoon-shaped designs of the frontal areas which are curved or drawn up relative to the bevel, groove, or the like possess edges which have, or can perform, at least partially, the function of cutting and also simultaneously of displacing material if these frontal areas are utilized as internal thread-generating means.
At each bevel, groove, or the like, each individual crest of a thread possesses two frontal areas, and according to the invention the second area formed in the direction of rolling has a lesser pitch than the frontal area designed for cutting, but even the latter is still kept sufficiently concave or spoon-shaped in order to attain a restoring torque which is greatly improved over the designs known heretofore. It is also possible, under special circumstances, to interchange the functions of the two frontal areas so that the flatter area will act as thread-forming means when entering and turning in the threaded bushing, with the more pronouncedly curved frontal area increasing the exit torque during return movement.
Manufacture is accomplished by a process covered by the invention, preferably by thread-rolling. It was found unexpectedly and surprisingly that in case of basic material possessing the bevels or grooves at full length, anbd proper selection of the rolling surface pressure as well as the other characteristics of the rolling process, there are created by the thread-rolling curved frontal areas at the crests of the thread, that is within the zone of transition between the crest of the thread and the bevel or groove, a significant feature being that through such rolling process, correctly set and controlled, said raised edges of the frontal area are produced. The direction of rolling should correspond to the direction of turning in of the bushing if it is desired to use the steeper or more pronouncedly curved three-forming element (the frontal areas) for the creation of the internal thread within the smooth bore of the work piece; if it is desired, in case of special circumstances, to employ the lesser curved frontal areas as the thread-forming areas, the opposite rolling direction will be chosen. As ready mentioned, in the latter case the restoring moment is thus increased still further.
The ratio between the internal thread forming by cutting and by shaping without cutting will vary, depending for example on the steepness or height of the frontal area curvature, the sharpness of the edges of the frontal area, and other characteristics. In any event, the invention will have the effect of attaining a sufficient deformation of material without cutting, following, timewise, the cutting phase of the thread-forming process, so that compacting of the material as well as an improvement in the fiber structure of the material of the work piece can be attained. Such deformation of the material has the additional advantage that the inserted threaded bushing will be seated more strongly and securely in the work piece.
If the edges of the frontal areas are not especially sharp, as can be definitely accomplished by means of a properly controlled rolling process, any danger of separating the fibers of the work piece material will be eliminated.
BRIEF DESCRIPTION OF THE DRAWINGS Specifically, the drawings illustrate:
In FIG. 1, the profile of a solid rod with three uniformly-spaced bevels in longitudinal direction;
In FIG. 2, a solid rod in profile with slightly convex bevels running in a longitudinal direction;
In FIG. 3, a solid rod in profile with three uniformlyspaced, slightly concave bevels running in longitudinal direction;
In FIG. 4, a plan view ofa completed threaded bushing;
In FIG. 5, a plan view of another species of a completed bushing;
In FIG. 6, a completed threaded bushing in perspective;
In FIG. 7, an enlargement of the area VII depicted in FIG. 6;
In FIG. 8, a section along line VIII-VIII of FIG. 7;
In FIG. 9, a section along line IX IX of FIG. 7;
In FIG. 10, a section along line X X of FIG. 7; and
In FIG. 11, the insertion and turning process of a bushing into a work piece.
DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS FIG. 1 shows rod I, originally a round bar, provided with flat bevels 2, spaced uniformly at the contour and running axially parallel, that is, in a longitudinal direction of the rod.
FIG. 2 shows a substantially identical rod 1, its bevels 2 shaped slightly in convex form, but otherwise identical with bevels 2.
In FIG. 3 the bevels 2" are shaped concavely at the otherwise identical rod 1'', running again in longitudinal direction, axially parallel. At area 3 it is indicated that the rod can be hollowed, whereby the inner wall 3 can be provided with the required internal thread at the proper stage of the manufacturing process. Usually,
- solid rods will be preferable in view of the rolling process because there exists the danger that a thin-walled tube could be deformed excessively due to the rolling pressure.
FIG. 4 shows a completed threaded bushing B in plan view, where the direction of turning is identical with the direction of rolling, both running in clockwise direction. The rolling direction illustrated, creating the male thread, causes the above-discussed bulging, that is, the formation of curved-up or bent-up cutting edges 13, created by clockwise displacement of material. The rolling process also has the peculiar consequence that there will rise in the other direction, that is, opposite to the rolling direction, a less pronounced curvature at 14, which in this case represents the restoring edge.
In case of the threaded bushing B, shown in FIG. 5 in the form of an axial view, the rolling had been performed in opposite direction, and this figure illustrates that the position of the edges or frontal areas 13 and 14 becomes reversed, the areas being designated by numerals l3 and 14'.
FIG. 6 shows the tapering of the lower threads within area 12, a feature which is known per se and which can be accomplished for example by proper turning or grinding.
We wish to mention that the preferred basic material is a rod, manufactured by drawing and formed as shown in FIGS. 1-3. A significant feature of the invention is the fact that the frontal areas l3-as well as the opposite areas 14, created at the intersections between the bevels 2, the flanks a and 15b and the crests 15 of each thread at the zone of transition toward the bevel 2 or the like, have a concave shape, similar to a spoon, for example, an internal surface in the form of a spade or scoop; in other words, areas are curved inwards spherically and cup-like. Also, the roots 11 between successive threads are essentially discontinuous at bevel 2.
FIGS. 7 and 8 illustrate these points in a particularly clear manner. The frontal areas 13 possess a spherical concavity of the frontal edge or area of the crest 15 of the thread. The frontal areas 14 are shaped in the same manner although less pronouncedly. The edges 13 and 13 of said frontal areas I3 are formed at the intersection of flanks 15a and 15b with bevel 2 and are upwardly forced, narrow crests which act in a certain manner as cutting edges, that is, metal-removing edges; however, since they do not possess the sharpness of a knife, they will fulfill the desired effect of not only removing metal by cutting but to begin, and at least carry out partially, the process of deforming material during the formation of the'female thread within the work piece. Likewise, the edges or rims 14' and 14 of the frontal areas M will form not too sharp cutting edges, so that these frontal areas 14 will increase significantly the restoring moment during the back-out, assuming that the direction of entry and turning corresponds to the arrow E in FIG. 7. Obviously, in case of the opposite direction of turning, as indicated by arrow E, the frontal area I4 will be the area forming the female thread, and areas 13 the back-out areas, causing a particularly great increase in the restoring moment.
FIGS. 9 and I0 illustrate the sectional views along the lines depicted in FIG. 7. It should be noted that within the lower region 12 (see FIG. 6), the crests of the thread are flattened, that is, designed in tapered shape, as indicated by the broken line 17 in FIG. 10 (note shown in FIG. 9).
FIG. 11 shows how a threaded bushing B is introduced and turned in work piece 19 in direction E by a turning tool 18 of known construction, the work piece possessing a known smooth bore 20, the bore diameter being smaller than the widest part of the outer diameter of bushing B. The bushing B, illustrated in FIG. 11, has for example the thread-forming frontal areas 13 and the back-out areas 14, as shown in FIG. 6.
According to a preferred embodiment, the bushings of the present invention are made from a length of rod of basic circular cross section which has been provided with longitudinal planar bevels generally as shown, for example, in FIG. I. As shown in FIGS. 4, 5, 7, and 8, the longitudinal planar bevels are located on chords of the basic circular cross section of the rod which are at a depth within the circular cross section sufficient to ensure that subsequent thread-rolling on the circular cross section does not produce any threads whose roots extend completely across the bevelled portions. In other words, the thread root radius is chosen to be at least as large as the minimum radius between the center of the circular cross section and the planar bevel. Thread rolling is properly carried out by the wellknown means of three rollers spaced circumferentially about the rod, and preferably the direction of thread rolling is clockwise, that is, in the direction of turning of the bushing into the workpiece. The .thread rolling rollers are adjusted as required by the particular thread geometry and the rod material so that the conventional thread rolling surfaces do not roll any thread roots completely across the area in which the planar bevels are located on the rod, in a manner that will be appreciated by those skilled in the thread-rolling art. After the threads have been rolled onto the rod, the thenthreaded rod is cut into a plurality of pieces each of which comprises a single bushing.
Also covered by the invention is the manufacture of threaded bushings possessing one or more of the above discussed features in that manner that first pieces of bushing length are cut off from a rod or tube section possessing a round contour, the pieces are then provided with bevels (2,2) and with a male thread by rolling, the internal thread being created in usual manner.
Finally, another manufacturing process within the framework of the invention could utilize pressure die casting with the pressure die casting tools or molds being shaped and designed in such manner that the I above-discussed physical features, in particular the scoop-shaped form of the frontal areas l3, 14, will be created.
Having described an improved self-tapping bushing as one improvement of this invention, we desire it to be understood that various other modifications and alterations may be made to the specific forms shown without departing from the scope of the invention.
What we claim is:
l. A threaded self-tapping bushing adapted to be secured to a workpiece and comprising,
an elongate member having helical male threads extending over at least a portion of its axial length said threads having crests, roots between said crests, and flanks extending from said crests to said roots on either side of said crests;
said member having at least one axially extending bevel intersecting a plurality of successive threads, the crests and flanks of each said male thread at their intersection with said bevel defining frontal areas on either side of said bevel which are concave both along the circumferential direction of each said male thread and transversely thereto along the axial direction of the bushing, each said bevel being approximately as deep as the roots between the crests to ensure that the roots between successive crests are essentially discontinuous at each bevelled portion, each said frontal area providing cutting edges along at least a part of its periphery as defined by said crest, flanks, and bevel,
one of the two said frontal areas formed at the junction of each said male thread with said bevel having a greater curvature than the other.
2. The threaded bushing of claim 1 in which the leading frontal area in the direction of turning said bushing into said work piece has less curvature than the lagging frontal area.
3. The threaded bushing of claim 1 in which the beveled male thread profiles at at least one end of the bushing are conically tapered inwardly.

Claims (3)

1. A threaded self-tapping bushing adapted to be secured to a workpiece and comprising, an elongate member having helical male threads extending over at least a portion of its axial length said threads having crests, roots between said crEsts, and flanks extending from said crests to said roots on either side of said crests; said member having at least one axially extending bevel intersecting a plurality of successive threads, the crests and flanks of each said male thread at their intersection with said bevel defining frontal areas on either side of said bevel which are concave both along the circumferential direction of each said male thread and transversely thereto along the axial direction of the bushing, each said bevel being approximately as deep as the roots between the crests to ensure that the roots between successive crests are essentially discontinuous at each bevelled portion, each said frontal area providing cutting edges along at least a part of its periphery as defined by said crest, flanks, and bevel, one of the two said frontal areas formed at the junction of each said male thread with said bevel having a greater curvature than the other.
2. The threaded bushing of claim 1 in which the leading frontal area in the direction of turning said bushing into said work piece has less curvature than the lagging frontal area.
3. The threaded bushing of claim 1 in which the beveled male thread profiles at at least one end of the bushing are conically tapered inwardly.
US329952A 1967-06-05 1973-02-05 Self-tapping threaded bushings Expired - Lifetime US3866510A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US329952A US3866510A (en) 1967-06-05 1973-02-05 Self-tapping threaded bushings
US05/593,404 USRE28907E (en) 1967-06-05 1975-07-03 Self-tapping threaded bushings

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEK0062476 1967-06-05
US329952A US3866510A (en) 1967-06-05 1973-02-05 Self-tapping threaded bushings

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US05/593,404 Reissue USRE28907E (en) 1967-06-05 1975-07-03 Self-tapping threaded bushings

Publications (1)

Publication Number Publication Date
US3866510A true US3866510A (en) 1975-02-18

Family

ID=25984377

Family Applications (1)

Application Number Title Priority Date Filing Date
US329952A Expired - Lifetime US3866510A (en) 1967-06-05 1973-02-05 Self-tapping threaded bushings

Country Status (1)

Country Link
US (1) US3866510A (en)

Cited By (64)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4003287A (en) * 1975-07-08 1977-01-18 Yardley Products Corporation Insert of the self-tapping fluted type
US4288189A (en) * 1979-08-10 1981-09-08 Yardley Products Corp. Threaded insert
EP0062712A1 (en) * 1981-04-09 1982-10-20 Deere & Company Improved shaft bearing bush and bearing assembly
FR2597937A1 (en) * 1986-04-23 1987-10-30 Rexnord Inc NET ELEMENT USED AS INSERT
EP0444795A1 (en) * 1990-02-28 1991-09-04 Tappex Thread Inserts Limited Fastener
US5403137A (en) * 1990-12-13 1995-04-04 Upat Gmbh & Co. Process and device for attaching an object to a lightweight material wall
US5547323A (en) * 1994-05-31 1996-08-20 Fang; Steven Threaded bush
WO2001038762A1 (en) * 1999-11-23 2001-05-31 Thomas Industries Inc. Pressure relief valve assembly
US20010007074A1 (en) * 1999-12-23 2001-07-05 Michael Strobel Screw for medical purposes and a driving tool
US6349739B1 (en) 1997-01-06 2002-02-26 Caterpillar Inc. Multi-component metallic housing for a fluid
US20020138144A1 (en) * 1995-02-17 2002-09-26 Michelson Gary Karlin Threaded frusto-conical interbody spinal fusion implants
US6645206B1 (en) * 1995-03-27 2003-11-11 Sdgi Holdings, Inc. Interbody fusion device and method for restoration of normal spinal anatomy
US20040220575A1 (en) * 2003-04-30 2004-11-04 Biedermann Motech Gmbh Bone anchoring element with thread that can be unscrewed
US20050164146A1 (en) * 2004-01-28 2005-07-28 Cantor Stanton R. Anchoring element for use in bone
US20050203522A1 (en) * 2001-10-03 2005-09-15 Vaughan Medical Technologies, Inc. Vertebral stabilization assembly and method
US20080003539A1 (en) * 2004-03-05 2008-01-03 Dan Lundgren Tubular Bone Anchoring Element
US20090035091A1 (en) * 2007-08-03 2009-02-05 Newfrey Llc Threaded bolt and method for its production
US20100191294A1 (en) * 2003-06-13 2010-07-29 Tyco Healthcare Group Lp Multiple member interconnect for surgical instrument and absorbable screw fastener
US20110262246A1 (en) * 2010-04-23 2011-10-27 Stahlwerk Annahütte Max Aicher GmbH & Co., KG Threaded Rod
US8876530B2 (en) 2008-09-10 2014-11-04 Nobel Biocare Services Ag Device and procedure for implanting a dental implant
US9351728B2 (en) 2013-06-28 2016-05-31 Covidien Lp Articulating apparatus for endoscopic procedures
US9351733B2 (en) 2013-01-18 2016-05-31 Covidien Lp Surgical fastener applier
US9358010B2 (en) 2013-03-12 2016-06-07 Covidien Lp Flex cable and spring-loaded tube for tacking device
US9358004B2 (en) 2013-06-28 2016-06-07 Covidien Lp Articulating apparatus for endoscopic procedures
US9364231B2 (en) 2011-10-27 2016-06-14 Covidien Lp System and method of using simulation reload to optimize staple formation
US20160215806A1 (en) * 2015-01-23 2016-07-28 Spirol International Corporation Extruded Metal Insert
US9526498B2 (en) 2013-09-17 2016-12-27 Covidien Lp Surgical device with a trigger lockout mechanism device
US9655621B2 (en) 2013-03-15 2017-05-23 Covidien Lp Surgical instrument for dispensing tacks and solution
US9668730B2 (en) 2013-06-28 2017-06-06 Covidien Lp Articulating apparatus for endoscopic procedures with timing system
USD802407S1 (en) * 2015-11-11 2017-11-14 Gard Specialist Co., Inc. Thread repair insert
US9827028B2 (en) * 2010-02-26 2017-11-28 Biedermann Technologies Gmbh & Co. Kg Bone screw
US9867620B2 (en) 2013-03-14 2018-01-16 Covidien Lp Articulation joint for apparatus for endoscopic procedures
US10085746B2 (en) 2013-06-28 2018-10-02 Covidien Lp Surgical instrument including rotating end effector and rotation-limiting structure
US10098634B2 (en) 2004-04-27 2018-10-16 Covidien Lp Absorbable fastener for hernia mesh fixation
US10335146B2 (en) 2014-04-02 2019-07-02 Coviden Lp Surgical fastener applying apparatus, kits and methods for endoscopic procedures
US10349982B2 (en) 2011-11-01 2019-07-16 Nuvasive Specialized Orthopedics, Inc. Adjustable magnetic devices and methods of using same
US10478232B2 (en) 2009-04-29 2019-11-19 Nuvasive Specialized Orthopedics, Inc. Interspinous process device and method
US10617409B2 (en) 2016-10-21 2020-04-14 Covidien Lp Surgical end effectors
US10617453B2 (en) 2015-10-16 2020-04-14 Nuvasive Specialized Orthopedics, Inc. Adjustable devices for treating arthritis of the knee
US10646262B2 (en) 2011-02-14 2020-05-12 Nuvasive Specialized Orthopedics, Inc. System and method for altering rotational alignment of bone sections
US10653507B2 (en) 2013-07-24 2020-05-19 Covidien Lp Expanding absorbable tack
US10660675B2 (en) 2010-06-30 2020-05-26 Nuvasive Specialized Orthopedics, Inc. External adjustment device for distraction device
US10729470B2 (en) 2008-11-10 2020-08-04 Nuvasive Specialized Orthopedics, Inc. External adjustment device for distraction device
US10743794B2 (en) 2011-10-04 2020-08-18 Nuvasive Specialized Orthopedics, Inc. Devices and methods for non-invasive implant length sensing
US10743859B2 (en) 2016-10-21 2020-08-18 Covidien Lp Surgical end effectors
US10751094B2 (en) 2013-10-10 2020-08-25 Nuvasive Specialized Orthopedics, Inc. Adjustable spinal implant
US10835290B2 (en) 2015-12-10 2020-11-17 Nuvasive Specialized Orthopedics, Inc. External adjustment device for distraction device
US10888309B2 (en) 2017-01-31 2021-01-12 Covidien Lp Surgical fastener devices with geometric tubes
US10918425B2 (en) 2016-01-28 2021-02-16 Nuvasive Specialized Orthopedics, Inc. System and methods for bone transport
US11090097B2 (en) 2015-03-17 2021-08-17 Covidien Lp Connecting end effectors to surgical devices
US11116500B2 (en) 2018-06-28 2021-09-14 Covidien Lp Surgical fastener applying device, kits and methods for endoscopic procedures
US11191579B2 (en) 2012-10-29 2021-12-07 Nuvasive Specialized Orthopedics, Inc. Adjustable devices for treating arthritis of the knee
US11197675B2 (en) 2019-12-19 2021-12-14 Covidien Lp Positioning guide for surgical instruments and surgical instrument systems
US11202707B2 (en) 2008-03-25 2021-12-21 Nuvasive Specialized Orthopedics, Inc. Adjustable implant system
US11234849B2 (en) 2006-10-20 2022-02-01 Nuvasive Specialized Orthopedics, Inc. Adjustable implant and method of use
US11246694B2 (en) 2014-04-28 2022-02-15 Nuvasive Specialized Orthopedics, Inc. System for informational magnetic feedback in adjustable implants
USD944984S1 (en) 2019-12-19 2022-03-01 Covidien Lp Tubular positioning guide
USD944985S1 (en) 2019-12-19 2022-03-01 Covidien Lp Positioning guide cuff
US11298123B2 (en) 2016-10-21 2022-04-12 Covidien Lp Surgical end effectors
US11298126B2 (en) 2018-05-02 2022-04-12 Covidien Lp Shipping wedge for end effector installation onto surgical devices
US11357549B2 (en) 2004-07-02 2022-06-14 Nuvasive Specialized Orthopedics, Inc. Expandable rod system to treat scoliosis and method of using the same
US11439449B2 (en) 2014-12-26 2022-09-13 Nuvasive Specialized Orthopedics, Inc. Systems and methods for distraction
US11523817B2 (en) 2019-06-27 2022-12-13 Covidien Lp Endoluminal pursestring device
US11612416B2 (en) 2015-02-19 2023-03-28 Nuvasive Specialized Orthopedics, Inc. Systems and methods for vertebral adjustment

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2347360A (en) * 1942-08-03 1944-04-25 American Screw Co Self-tapping screw
US3209383A (en) * 1961-09-15 1965-10-05 Textron Ind Inc Fluted lobular thread-forming members
US3451080A (en) * 1965-11-23 1969-06-24 Glynwed Screws & Fastening Ltd Screws

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2347360A (en) * 1942-08-03 1944-04-25 American Screw Co Self-tapping screw
US3209383A (en) * 1961-09-15 1965-10-05 Textron Ind Inc Fluted lobular thread-forming members
US3451080A (en) * 1965-11-23 1969-06-24 Glynwed Screws & Fastening Ltd Screws

Cited By (109)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4003287A (en) * 1975-07-08 1977-01-18 Yardley Products Corporation Insert of the self-tapping fluted type
US4288189A (en) * 1979-08-10 1981-09-08 Yardley Products Corp. Threaded insert
US4487460A (en) * 1981-04-09 1984-12-11 Deere & Company Bushing assembly for preloading a thrust bearing
EP0062712A1 (en) * 1981-04-09 1982-10-20 Deere & Company Improved shaft bearing bush and bearing assembly
FR2597937A1 (en) * 1986-04-23 1987-10-30 Rexnord Inc NET ELEMENT USED AS INSERT
US7534254B1 (en) 1988-06-13 2009-05-19 Warsaw Orthopedic, Inc. Threaded frusto-conical interbody spinal fusion implants
EP0444795A1 (en) * 1990-02-28 1991-09-04 Tappex Thread Inserts Limited Fastener
US5403137A (en) * 1990-12-13 1995-04-04 Upat Gmbh & Co. Process and device for attaching an object to a lightweight material wall
US5547323A (en) * 1994-05-31 1996-08-20 Fang; Steven Threaded bush
US20020138144A1 (en) * 1995-02-17 2002-09-26 Michelson Gary Karlin Threaded frusto-conical interbody spinal fusion implants
US20040097928A1 (en) * 1995-03-27 2004-05-20 Thomas Zdeblick Interbody fusion device and method for restoration of normal spinal anatomy
US7238186B2 (en) 1995-03-27 2007-07-03 Warsaw Orthopedic, Inc. Interbody fusion device and method for restoration of normal spinal anatomy
US6645206B1 (en) * 1995-03-27 2003-11-11 Sdgi Holdings, Inc. Interbody fusion device and method for restoration of normal spinal anatomy
US8226652B2 (en) 1995-06-07 2012-07-24 Warsaw Orthopedic, Inc. Threaded frusto-conical spinal implants
US8679118B2 (en) 1995-06-07 2014-03-25 Warsaw Orthopedic, Inc. Spinal implants
US8057475B2 (en) 1995-06-07 2011-11-15 Warsaw Orthopedic, Inc. Threaded interbody spinal fusion implant
US20110054529A1 (en) * 1995-06-07 2011-03-03 Gary Karlin Michelson Threaded interbody spinal fusion implant
US7828800B2 (en) 1995-06-07 2010-11-09 Warsaw Orthopedic, Inc. Threaded frusto-conical interbody spinal fusion implants
US6349739B1 (en) 1997-01-06 2002-02-26 Caterpillar Inc. Multi-component metallic housing for a fluid
WO2001038762A1 (en) * 1999-11-23 2001-05-31 Thomas Industries Inc. Pressure relief valve assembly
US7261716B2 (en) * 1999-12-23 2007-08-28 Karl Storz Gmbh & Co. Kg Biodegradable interference screw and tool for attaching a transplant to a bone
US20010007074A1 (en) * 1999-12-23 2001-07-05 Michael Strobel Screw for medical purposes and a driving tool
US20050203522A1 (en) * 2001-10-03 2005-09-15 Vaughan Medical Technologies, Inc. Vertebral stabilization assembly and method
US10285744B2 (en) 2003-04-30 2019-05-14 Biedermann Technologies Gmbh & Co. Kg Bone anchoring element with thread that can be unscrewed
US7713292B2 (en) * 2003-04-30 2010-05-11 Biedermann Motech Gmbh Bone anchoring element with thread that can be unscrewed
US20100234903A1 (en) * 2003-04-30 2010-09-16 Biedermann Motech Gmbh Bone anchoring element with thread that can be unscrewed
US20040220575A1 (en) * 2003-04-30 2004-11-04 Biedermann Motech Gmbh Bone anchoring element with thread that can be unscrewed
US9364274B2 (en) 2003-06-13 2016-06-14 Covidien Lp Multiple member interconnect for surgical instrument and absorbable screw fastener
US20100191294A1 (en) * 2003-06-13 2010-07-29 Tyco Healthcare Group Lp Multiple member interconnect for surgical instrument and absorbable screw fastener
EP2308404A1 (en) * 2003-06-13 2011-04-13 Tyco Healthcare Group LP Multiple member interconnect for surgical instrument and absorbable screw fastener
EP2314241A1 (en) * 2003-06-13 2011-04-27 Tyco Healthcare Group LP Multiple member interconnect for surgical instrument and absorbable screw fastener
JP2011101814A (en) * 2003-06-13 2011-05-26 Tyco Healthcare Group Lp Multiple member interconnect for surgical instrument and absorbable screw fastener
US9662106B2 (en) 2003-06-13 2017-05-30 Covidien Lp Surgical fastener with predetermined resorption rate
US10070860B2 (en) 2003-06-13 2018-09-11 Covidien Lp Multiple member interconnect for surgical instrument and absorbable screw fastener
US9788833B2 (en) 2003-06-13 2017-10-17 Covidien Lp Multiple member interconnect for surgical instrument and absorbable screw fastener
US9259221B2 (en) 2003-06-13 2016-02-16 Covidien Lp Multiple member interconnect for surgical instrument and absorbable screw fastener
US8292933B2 (en) 2003-06-13 2012-10-23 Tyco Healthcare Group Lp Multiple member interconnect for surgical instrument and absorbable screw fastener
US7845945B2 (en) * 2004-01-28 2010-12-07 Stanton R. Canter Anchoring element for use in bone
US20050164146A1 (en) * 2004-01-28 2005-07-28 Cantor Stanton R. Anchoring element for use in bone
US20070292820A1 (en) * 2004-01-28 2007-12-20 Canter Stanton R Anchoring Element for Use in Bone
US8128402B2 (en) 2004-03-05 2012-03-06 Nobel Biocare Services, Ag Tubular bone anchoring element
US20080003539A1 (en) * 2004-03-05 2008-01-03 Dan Lundgren Tubular Bone Anchoring Element
US10098634B2 (en) 2004-04-27 2018-10-16 Covidien Lp Absorbable fastener for hernia mesh fixation
US11357549B2 (en) 2004-07-02 2022-06-14 Nuvasive Specialized Orthopedics, Inc. Expandable rod system to treat scoliosis and method of using the same
US11672684B2 (en) 2006-10-20 2023-06-13 Nuvasive Specialized Orthopedics, Inc. Adjustable implant and method of use
US11234849B2 (en) 2006-10-20 2022-02-01 Nuvasive Specialized Orthopedics, Inc. Adjustable implant and method of use
US20090035091A1 (en) * 2007-08-03 2009-02-05 Newfrey Llc Threaded bolt and method for its production
US11202707B2 (en) 2008-03-25 2021-12-21 Nuvasive Specialized Orthopedics, Inc. Adjustable implant system
US8876530B2 (en) 2008-09-10 2014-11-04 Nobel Biocare Services Ag Device and procedure for implanting a dental implant
US9463078B2 (en) 2008-09-10 2016-10-11 Nobel Biocare Services Ag Device and procedure for implanting a dental implant
US10729470B2 (en) 2008-11-10 2020-08-04 Nuvasive Specialized Orthopedics, Inc. External adjustment device for distraction device
US10478232B2 (en) 2009-04-29 2019-11-19 Nuvasive Specialized Orthopedics, Inc. Interspinous process device and method
US9827028B2 (en) * 2010-02-26 2017-11-28 Biedermann Technologies Gmbh & Co. Kg Bone screw
US8696284B2 (en) * 2010-04-23 2014-04-15 Stahlwerk Annahutte Max Aicher Gmbh & Co. Kg Threaded rod
US20110262246A1 (en) * 2010-04-23 2011-10-27 Stahlwerk Annahütte Max Aicher GmbH & Co., KG Threaded Rod
US10660675B2 (en) 2010-06-30 2020-05-26 Nuvasive Specialized Orthopedics, Inc. External adjustment device for distraction device
US10646262B2 (en) 2011-02-14 2020-05-12 Nuvasive Specialized Orthopedics, Inc. System and method for altering rotational alignment of bone sections
US10743794B2 (en) 2011-10-04 2020-08-18 Nuvasive Specialized Orthopedics, Inc. Devices and methods for non-invasive implant length sensing
US11051805B2 (en) 2011-10-27 2021-07-06 Covidien Lp System and method of using simulation reload to optimize staple formation
US9364231B2 (en) 2011-10-27 2016-06-14 Covidien Lp System and method of using simulation reload to optimize staple formation
US10349982B2 (en) 2011-11-01 2019-07-16 Nuvasive Specialized Orthopedics, Inc. Adjustable magnetic devices and methods of using same
US11123107B2 (en) 2011-11-01 2021-09-21 Nuvasive Specialized Orthopedics, Inc. Adjustable magnetic devices and methods of using same
US11191579B2 (en) 2012-10-29 2021-12-07 Nuvasive Specialized Orthopedics, Inc. Adjustable devices for treating arthritis of the knee
US11213330B2 (en) 2012-10-29 2022-01-04 Nuvasive Specialized Orthopedics, Inc. Adjustable devices for treating arthritis of the knee
US10226248B2 (en) 2013-01-18 2019-03-12 Covidien Lp Surgical fastener applier
US9351733B2 (en) 2013-01-18 2016-05-31 Covidien Lp Surgical fastener applier
US10105135B2 (en) 2013-03-12 2018-10-23 Covidien Lp Flex cable and spring-loaded tube for tacking device
US9358010B2 (en) 2013-03-12 2016-06-07 Covidien Lp Flex cable and spring-loaded tube for tacking device
US9867620B2 (en) 2013-03-14 2018-01-16 Covidien Lp Articulation joint for apparatus for endoscopic procedures
US10869671B2 (en) 2013-03-14 2020-12-22 Covidien Lp Articulation joint for apparatus for endoscopic procedures
US10806455B2 (en) 2013-03-15 2020-10-20 Covidien Lp Surgical instrument for dispensing tacks and solution
US9655621B2 (en) 2013-03-15 2017-05-23 Covidien Lp Surgical instrument for dispensing tacks and solution
US9668730B2 (en) 2013-06-28 2017-06-06 Covidien Lp Articulating apparatus for endoscopic procedures with timing system
US10786250B2 (en) 2013-06-28 2020-09-29 Covidien Lp Surgical instrument including rotating end effector and rotation-limiting structure
US10588627B2 (en) 2013-06-28 2020-03-17 Covidien Lp Articulating apparatus for endoscopic procedures with timing system
US9351728B2 (en) 2013-06-28 2016-05-31 Covidien Lp Articulating apparatus for endoscopic procedures
US10188387B2 (en) 2013-06-28 2019-01-29 Covidien Lp Articulating apparatus for endoscopic procedures
US11266401B2 (en) 2013-06-28 2022-03-08 Covidien Lp Articulating apparatus for endoscopic procedures with timing system
US9358004B2 (en) 2013-06-28 2016-06-07 Covidien Lp Articulating apparatus for endoscopic procedures
US9783329B2 (en) 2013-06-28 2017-10-10 Covidien Lp Articulating apparatus with shipping wedge
US10085746B2 (en) 2013-06-28 2018-10-02 Covidien Lp Surgical instrument including rotating end effector and rotation-limiting structure
US10653507B2 (en) 2013-07-24 2020-05-19 Covidien Lp Expanding absorbable tack
US9526498B2 (en) 2013-09-17 2016-12-27 Covidien Lp Surgical device with a trigger lockout mechanism device
US10751094B2 (en) 2013-10-10 2020-08-25 Nuvasive Specialized Orthopedics, Inc. Adjustable spinal implant
US10335146B2 (en) 2014-04-02 2019-07-02 Coviden Lp Surgical fastener applying apparatus, kits and methods for endoscopic procedures
US11246694B2 (en) 2014-04-28 2022-02-15 Nuvasive Specialized Orthopedics, Inc. System for informational magnetic feedback in adjustable implants
US11439449B2 (en) 2014-12-26 2022-09-13 Nuvasive Specialized Orthopedics, Inc. Systems and methods for distraction
US9856902B2 (en) * 2015-01-23 2018-01-02 Spirol International Corporation Extruded metal insert
US20160215806A1 (en) * 2015-01-23 2016-07-28 Spirol International Corporation Extruded Metal Insert
US11612416B2 (en) 2015-02-19 2023-03-28 Nuvasive Specialized Orthopedics, Inc. Systems and methods for vertebral adjustment
US11090097B2 (en) 2015-03-17 2021-08-17 Covidien Lp Connecting end effectors to surgical devices
US11871976B2 (en) 2015-03-17 2024-01-16 Covidien Lp Connecting end effectors to surgical devices
US10617453B2 (en) 2015-10-16 2020-04-14 Nuvasive Specialized Orthopedics, Inc. Adjustable devices for treating arthritis of the knee
USD802407S1 (en) * 2015-11-11 2017-11-14 Gard Specialist Co., Inc. Thread repair insert
US10835290B2 (en) 2015-12-10 2020-11-17 Nuvasive Specialized Orthopedics, Inc. External adjustment device for distraction device
US10918425B2 (en) 2016-01-28 2021-02-16 Nuvasive Specialized Orthopedics, Inc. System and methods for bone transport
US11298123B2 (en) 2016-10-21 2022-04-12 Covidien Lp Surgical end effectors
US11382614B2 (en) 2016-10-21 2022-07-12 Covidien Lp Surgical end effectors
US10743859B2 (en) 2016-10-21 2020-08-18 Covidien Lp Surgical end effectors
US11596396B2 (en) 2016-10-21 2023-03-07 Covidien Lp Surgical end effectors
US10617409B2 (en) 2016-10-21 2020-04-14 Covidien Lp Surgical end effectors
US10888309B2 (en) 2017-01-31 2021-01-12 Covidien Lp Surgical fastener devices with geometric tubes
US11298126B2 (en) 2018-05-02 2022-04-12 Covidien Lp Shipping wedge for end effector installation onto surgical devices
US11779328B2 (en) 2018-05-02 2023-10-10 Covidien Lp Shipping wedge for end effector installation onto surgical devices
US11116500B2 (en) 2018-06-28 2021-09-14 Covidien Lp Surgical fastener applying device, kits and methods for endoscopic procedures
US11523817B2 (en) 2019-06-27 2022-12-13 Covidien Lp Endoluminal pursestring device
USD944985S1 (en) 2019-12-19 2022-03-01 Covidien Lp Positioning guide cuff
USD944984S1 (en) 2019-12-19 2022-03-01 Covidien Lp Tubular positioning guide
US11197675B2 (en) 2019-12-19 2021-12-14 Covidien Lp Positioning guide for surgical instruments and surgical instrument systems

Similar Documents

Publication Publication Date Title
US3866510A (en) Self-tapping threaded bushings
USRE28907E (en) Self-tapping threaded bushings
US3597781A (en) Self-tapping threaded bushings
US3878759A (en) Bi-lobular self-thread forming fastener
US3978760A (en) Self-thread forming threaded fasteners and blanks for making same
US4194430A (en) Thread-forming screw with step taper
US2232336A (en) Fastening sorew
US4486135A (en) Tapping screw
US3209383A (en) Fluted lobular thread-forming members
US3942406A (en) Slab-sided self-tapping screw
US3237506A (en) Recessed head fasteners
US3218656A (en) Method of forming a self-tapping or thread-forming screw
US3775792A (en) Thread forming tap
US4561277A (en) Method of making screws and dies therefor
US1912517A (en) Means for threading nut blanks
US3939512A (en) Male screw-forming members
US3550255A (en) Method of making rotary threaded fasteners
CH646622A5 (en) METHOD AND TOOL FOR PRODUCING AN INSERT WITH A POLYGONAL FLANGE.
US3479921A (en) Non-circular screws
US4491002A (en) Method for forming on workpiece resilient thread having closed helical cavity inside the thread
US3238540A (en) Punch means for forming recesses in fastener heads and driving tools for said fasteners
US4046051A (en) Thread forming screw
DE3050452A1 (en) Method of obtaining butt-end wall with concentric recess in a tubular workpiece
US2347360A (en) Self-tapping screw
US3803889A (en) Self-thread forming threaded fasteners and method for making same