US3866509A - Self-tapping and self-retaining, screw thread insert - Google Patents

Self-tapping and self-retaining, screw thread insert Download PDF

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Publication number
US3866509A
US3866509A US390428A US39042873A US3866509A US 3866509 A US3866509 A US 3866509A US 390428 A US390428 A US 390428A US 39042873 A US39042873 A US 39042873A US 3866509 A US3866509 A US 3866509A
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US
United States
Prior art keywords
thread
insert
self
camber
retaining
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
US390428A
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English (en)
Inventor
Peter E Kraus
Kenneth C Newton
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.)
Emhart Industries Inc
Emhart Enterprises Corp
Original Assignee
Mite Corp
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 Mite Corp filed Critical Mite Corp
Priority to US390428A priority Critical patent/US3866509A/en
Priority to CA193,932A priority patent/CA988819A/en
Priority to IL44354A priority patent/IL44354A/en
Priority to SE7402991A priority patent/SE389380B/xx
Priority to GB1000974A priority patent/GB1415815A/en
Priority to IT49206/74A priority patent/IT1008410B/it
Priority to IN506/CAL/74A priority patent/IN140204B/en
Priority to BE142305A priority patent/BE812661A/xx
Priority to FR7409967A priority patent/FR2241716A1/fr
Priority to AR252999A priority patent/AR198734A1/es
Priority to DE19742415941 priority patent/DE2415941C3/de
Priority to JP3775074A priority patent/JPS5045159A/ja
Priority to CH633474A priority patent/CH570562A5/xx
Priority to BR4169/74A priority patent/BR7404169A/pt
Priority to AU77291/75A priority patent/AU479971B2/en
Application granted granted Critical
Publication of US3866509A publication Critical patent/US3866509A/en
Assigned to EMHART CORPORATION reassignment EMHART CORPORATION MERGER (SEE DOCUMENT FOR DETAILS). Assignors: MITE CORPORATION
Assigned to U.S.M. CORPORATION reassignment U.S.M. CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST. AS OF DEC 31, 1986 Assignors: EMHART CORPORATION
Assigned to EMHART ENTERPRISES CORP. reassignment EMHART ENTERPRISES CORP. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: USM CORPORTION
Assigned to EMHART INDUSTRIES, INC. A CORP. OF CT. reassignment EMHART INDUSTRIES, INC. A CORP. OF CT. MERGER (SEE DOCUMENT FOR DETAILS). SEPTEMBER 23, 1987, CT. Assignors: EMHART ENTERPRISES CORP.
Assigned to EMHART ENTERPRISES CORP. reassignment EMHART ENTERPRISES CORP. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: USM CORPORATION
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B37/00—Nuts or like thread-engaging members
    • F16B37/12—Nuts 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
    • F16B37/122—Threaded inserts, e.g. "rampa bolts"
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S411/00—Expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener
    • Y10S411/03—Utilizing fluid pressure
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S411/00—Expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener
    • Y10S411/924—Coupled nut and bolt
    • Y10S411/929—Thread lock
    • Y10S411/938—Distorted thread

Definitions

  • this screw thread insert embodies an effective self-retaining characteristic in the form of at least one external localized and longitudinal camber area extending back from its tip end and into its midsection with this camber area being provided along its crown with a generally longitudinal kerl' channel defining by its trailing side a thread cutting edge for forming a female receptive thread in the wall of a parent receiving body pilot hole.
  • the kerl channel interrupts a full diameter external thread turn of the midsection in a hump therein to form at the severed leading end of this thread turn a cutting tip at a radius slightly greater than the normal thread radius.
  • a following full diameter thread turn has a similar uninterrupted hump therein to provide an insertretaining means.
  • the present invention relates to self-tapping inserts equipped with retaining means.
  • Such screw thread inserts when of the tubular sleeve type has at least the back end section of its through bore internally threaded for screw-anchoring purposes.
  • the tapered tip end section is provided with circumferentially-spaced, longitudinal slots which break inward through the sleeve body wall into the internally-threaded bore to form trailing flanks which have cutting edges and intervening resilient fingers or tongues that are to serve as gripping retention means.
  • chips which are cut from the parent body pilot hole wall enter through the slots into the internally-threaded bore to foul the threads thereof.
  • the cutting edges be provided by generally longitudinally kerf channels, which will avoid passage through to the internal thread of fouling parent body chips, but the patentee recognizes in the specification that there is no adequate retention deflection of the strips of the insert wall between these channels.
  • the Harvey U.S. Pat. No. 3,174,521 of Mar. 23, l965 teaches a self-locking screw which has an externally-threaded solid shank provided with a transverse hole into which a tapered pin is driven transversely to bulge outwardly the areas of the thread turns on opposite sides of this transverse hole, for serving as locking means to provide interference fit with the female thread in a receptive parent body or nut. It does not propose any self-tapping feature in association therewith nor a sleeve insert equipped with a combination of cooperative self-tapping and self-retaining means.
  • An object of the present invention is to provide a practical self-tapping and self-retaining, screw thread sleeve or stud-shank insert which combines these features in a unique manner by equipping its exterior at one or more places with a generally longitudinal localized area that is distorted transversely outward slightly to project radially to a limited degree for forming a composite camber in which the sections of the external thread turns that cross this camber area are humped.
  • forward zone of such a camber area is provided with a generally longitudinal kerf channel or flute which interrupts forward thread turn hump portions there to produce interrupted thread turns as effective cutting edges.
  • These cutting edges will form the receptive female thread turns in the parent body receptive hole wall upon thread advancing rotation of the sleeve body, while retaining uninterrupted a hump portion of at least one following full diameter external thread turn to serve as an effective and controlled retaining means.
  • Another object is to provide these cooperative features in an improved self-tapping and self-retaining sleeve insert without distorting the internally-threaded bore of the sleeve body so as to assure proper threaded anchorage of a screw or stud therein.
  • the present screw thread insert is characterized by a body of relatively hard rigid material, such as, for example, carbon or corrosion resisting or plated steel, brass, relatively hard aluminum compositions, or other suitable materials that are appreciably harder than the parent body material.
  • the appreciably softer and relatively rigid parent body material may, for example, be cast or wrought aluminum or zinc alloys, cast magnesium, or relatively rigid plastics that are appreciably softer than the insert material.
  • the insert body has a leading tip end, a tip end section, a trailing back end and an intervening midsection. It is provided with an external male thread of any conventional or desired convenient style from the tip end back through the midsection at least to a point that normally will be located in the parent body receptive hole when fully seated therein.
  • the external thread turns on the midsection are of full diameter while those on the tip end section are taper chamfered to reduce the thread depth forward to the tip end of the insert body.
  • the radius be slightly greater than the nominal radius of such diameter thread turn in the portions of the insert which have not been transversely increased slightly by the provision of such a camber area.
  • the generally longitudinal kerf channel should extend along the crown of such camber area into and through at least the first full diameter external thread turn immediately back of the last thread turn of the tapered tip end section, so that the cutting tip of this first interrupted turn of the midsection on the trailing side of the kerf channel is located substantially at this slightly greater radius from the insert axis.
  • Such camber area may be so shaped transversely that the crest of its crown may have a relatively appreciable width.
  • this raised cutting tip as it is helically advanced in the female thread that is precedently cut progressively by the cutting thread turn tips in the tapered section to offset the inherent characteristic of the parent body material to spring back very slightly so as to close in sufficiently to form such a tight interference fit at the humped thread portions in each such camber area that may cause enough binding to hazard breakage of the rotary seating tool and incompletion of the insert seating.
  • the retentive characteristic can be selectively increased incrementally, each such added turn imposing a readily determinable increment of the amount of retention desired in a particular selection of the materials of the sleeve insert and parent body, the particular size of the sleeve insert and the duty it is to perform, as well as the degree of the camber height chosen.
  • the insert body be a tubular sleeve or a solid-shank stud having a counterbored leading end, so that the leading end section of the insert body has a generally tubular wall
  • the one or more camber areas should be located on this tubular wall in order to realize fully the desired retention characteristic.
  • the amount of retention desired can also be increased controllably by increasing selectively the number of localized camber areas that are provided. It may be desired for assuring a balanced insertion that is substantially free from insert cocking tendency to provide the insert body with a plurality of such camber areas located at substantially equal radial angles apart, e.g., 90, l and 180. So long as one of the localized camber areas is provided with a generally longitudinal kerf channel to form in at least one full diameter thread turn an interruption defining a greater radius cutting tip substantially at the crest of such camber area hump portion of this thread turn, then less than the full number or none of the additional camber areas need be provided with such a generally longitudinal kerf channel.
  • the degree of the camber height at the crest of the kerf-interrupted full diameter thread turn i.e., the height of the thread turn hump thereat over the flanking circular thread portions of this turn, should be quite small or slight, e.g., of the order of about 0.001 inch to about 0.010 inch, depending upon the size of the insert.
  • the greater the diameter of the insert the greater may be the slight difference between the radius of the circle described by the thread cutting tip of the full diameter turn at the crest of the hump therein and the radius of the flanking circular portions of this thread turn, within the approximate range indicated.
  • a pair thereof desirably may be provided at diametrically opposite points, or at quarter points, or at 120 apart, etc.
  • An effective arrangement has been determined to be the provision of three such localized camber areas located 120 apart with one thereof equipped with such a generally longitudinal kerf channel, and the additional provision of a similar kerf channel located diametrically opposite the firstmentioned one outside of any such localized camber area.
  • the localized and longitudinal raised camber areas in the externally threaded surface of the insert body may be formed in any suitable manner which is apparent to one skilled in this art.
  • the external male thread may be formed by a tool bit or thread chaser as the insert blank is axially rotated, with this tool being carried by a support which is caused by suitable means, such as a cam, to recede transversely where such camber areas are to be produced.
  • the tool support may be in the form of a rocker arm having a cam follower riding against a suitably lobed rotating arm.
  • the pitch of the external threads as they are being cut may be dictated by translation along the insert blank axis relative to the tool support or vice versa.
  • FIG. 1 is an elevational side view, to an enlarged scale, of an embodiment of the self-tapping and selfretaining, screw thread sleeve insert of the present invention
  • FIG. 2 is a tip end view of the sleeve insert depicted in FIG. 1;
  • FIG. 3 is a sectional detail of the sleeve insert of FIGS. 1 and 2 longitudinally through the kerf channel shown in FIG. 1 and that depicted on the right side of FIG. 2;
  • FIG. 4 is a tip end view, similar to FIG. 2, of another embodiment of sleeve insert of the present invention.
  • the embodiment of the sleeve insert 5 illustrated therein consists of a sleeve body 6 having a helical external male thread 7, and with its axial bore provided with an uninterrupted helical female thread 9.
  • This internallythreaded sleeve body has a leading tip end 10, a tip end section 11, a trailing back end 12, and an intervening midsection 13.
  • the successive external thread turns on the midsection are of full diameter and those on the tip end section 11 are taper chamfered progressively to reduce the thread depth toward the tip end 10, with this chamfering being of conventional form such as at an angle a of about l2 /z.
  • the external male thread 7 has its forward thread turns interrupted to produce a trailing cutting edge which includes severed tip ends of these interrupted thread turns for rotationally cutting a mating female thread into the wall of a receptive pilot hole in a parent body of rigid material which is relatively softer than the hard rigid material of the insert sleeve body 6, as will be explained later.
  • a generally longitudinal localized area, indicated at 14-1 in FIGS. 1 and 2, is provided on one exterior side of the sleeve body 6 from the tip end 10 back into the midsection 13 beyond portions of at least the first two thread turns of full diameter.
  • three such generally longitudinal localized areas are provided at 14-l, 142, and 14-3 at substantially equal radial angles apart, e.g., At least the first two thread turns of full diameter on the midsection 13 back of the chamfered tip end section 1 1 are included in this generally longitudinal localized area which projects radially outward to a quite limited degree to form a composite camber area in which the external thread turns which cross this localized camber area have hump portions provided with smooth transitions on the rotationally leading and trailing sides of this area with the adjacent circular portions of these thread turns flanking it, as will be best understood from FIG. 2.
  • One of these localized camber areas has a forward zone provided with a generally longitudinal and external threadinterrupting kerf channel or flute 15 extending across the external thread turns in this zone from a point rearward of at least the first full diameter turn in this midsection to the tip end without breaking inward through the wall of the sleeve body 6.
  • the rotationally trailing side 16 of this kerf channel and the severed ends of the external thread turns therein provide cutting edges which cut the female thread turns in the parent body receptive hole wall upon thread advancing rotation of the insert body thereinto.
  • this kerf channel I5 interrupts a full diameter thread turn it provides, at the trailing severed end 17 thereof, a cutting tip on a radius which is slightly greater than the radius of the circular portions of this full diameter turn, which is the radius of the full diameter turns of the midsection back of the localized camber areas, and this slightly greater radius is substantially that of the crests of the hump portions of all uninterrupted full diameter thread turns which cross such camber areas.
  • the height of such thread turn humps over the flanking parallel thread portions of such thread turns is quite small or slight, e.g., of the order of about 0.001 inch to about 0.010 inch, depending upon the size of the sleeve insert and desired end use.
  • the localized longitudinal camber areas 14-1 and 14-2 are free of such a kerf channel so that each provides full diameter thread turn humps to serve as cooperative retaining means.
  • a similar kerf channel 150 is provided diametrically opposite that at 15 which interrupts thread turn portions in the localized camber area 14-3, but that this second kerf channel does not interrupt thread turn humps. It does provide a trailing cutting edge and cutting thread turn tips on the smaller radius to supplement the thread cutting action of the kerf channel 15 for balancing to a desired degree the thread cutting torque.
  • each of the kerf channels 15 and 150 is substantially flat in the tangential direction and concaved in the longitudinal direction to run out to a full diameter thread turn for causing cut parent body material to break up into chips which may be readily removed from a receptive blind hole in the parent body.
  • each of the kerf channels provides a positive rake angle in the trailing cutting sides thereof to assure an efficient thread cutting action.
  • the shape of each of these kerf channels is such that, desirably, chips are formed ahead of the advancing insert similar to the action of a spiral point tap.
  • FIG. 4 illustrates another embodiment of the invention which satisfies the requisite characteristics.
  • the sleeve insert 50 of FIG. 4 is provided with a pair of the diametrically located localized longitudinal camber areas 14-1 and 14-2 each of which is provided with a kerf channel 1500 to form on its trailing side a cutting edge that includes a severed cutting thread tip substantially at the medial crest of a full diameter thread hump which extends across the localized camber area in which such kerf channel is formed.
  • a self-tapping and self-retaining, screw thread insert comprising an externally threaded cylindrical body of relatively hard rigid material having at least a hollow leading end portion defined by a tubular wall with external thread turns being interrupted for rotationally cutting a mating female thread into the wall of a receptive hole in a parent body of relatively softer rigid material; said insert body having a leading tip end, a tip end section, a trailing back end and an intervening midsection with the successive external thread turns on the latter being of full crest diameter and those on the tip end section having the crests thereon taper chamfered progressively to reduce the thread depth toward the tip end; characterized by the provision of l.
  • said localized camber area having a forward zone provided with a generally longitudinal and external thread-interrupting kerf channel extending forward across the external thread turns in this zone from a point rearward of at least the first full diameter turn in said midsection to said tip end without breaking inward through the wall of said sleeve body, whereby the rotationally trailing side of said kerf channel and the severed ends of the external thread turns therein provide cutting edges to form the female thread turns in the parent body receptive hole wall upon thread advancing rotation of said insert body thereinto with at least one uninterrupted full diameter thread turn of said midsection having such a hump portion crossing said camber area to serve with the female threads of said parent body an insert retaining means upon full seating of said insert into the parent body.
  • the self-tapping and self-retaining, screw thread insert of claim 1 characterized by said kerf channel having a bottom surface which is substantially flat in the tangential direction and concaved in the longitudinal direction to run out to a full diameter thread turn for causing cut parent body material to break up into readily removable chips.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Dowels (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
  • Joining Of Building Structures In Genera (AREA)
US390428A 1973-08-22 1973-08-22 Self-tapping and self-retaining, screw thread insert Expired - Lifetime US3866509A (en)

Priority Applications (15)

Application Number Priority Date Filing Date Title
US390428A US3866509A (en) 1973-08-22 1973-08-22 Self-tapping and self-retaining, screw thread insert
CA193,932A CA988819A (en) 1973-08-22 1974-03-04 Self-tapping and self-retaining, screw thread insert
IL44354A IL44354A (en) 1973-08-22 1974-03-05 Self-tapping and self-retaining screw thread insert
SE7402991A SE389380B (sv) 1973-08-22 1974-03-06 Sjelvgengande och sjelvlasande skruvgengad insats.
GB1000974A GB1415815A (en) 1973-08-22 1974-03-06 Self-tapping and self-retaining screw thread insert
IT49206/74A IT1008410B (it) 1973-08-22 1974-03-08 Tassello ad inserto autofilettante
IN506/CAL/74A IN140204B (xx) 1973-08-22 1974-03-11
BE142305A BE812661A (fr) 1973-08-22 1974-03-21 Element d'insertion a auto araudage et autofixation
FR7409967A FR2241716A1 (xx) 1973-08-22 1974-03-22
AR252999A AR198734A1 (es) 1973-08-22 1974-03-27 Un inserto de rosca a tornillo auto-roscante y auto-retenedor
DE19742415941 DE2415941C3 (de) 1973-08-22 1974-04-02 Selbstschneidender und sich selbst sichernder Gewindeeinsatz
JP3775074A JPS5045159A (xx) 1973-08-22 1974-04-03
CH633474A CH570562A5 (xx) 1973-08-22 1974-05-09
BR4169/74A BR7404169A (pt) 1973-08-22 1974-05-22 Inserto rosqueado auro-atarrachante e auto retentor aperfeicoado
AU77291/75A AU479971B2 (en) 1973-08-22 1975-01-14 Self-tapping and self-retaining screw thread insert

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US390428A US3866509A (en) 1973-08-22 1973-08-22 Self-tapping and self-retaining, screw thread insert

Publications (1)

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US3866509A true US3866509A (en) 1975-02-18

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Application Number Title Priority Date Filing Date
US390428A Expired - Lifetime US3866509A (en) 1973-08-22 1973-08-22 Self-tapping and self-retaining, screw thread insert

Country Status (13)

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US (1) US3866509A (xx)
AR (1) AR198734A1 (xx)
AU (1) AU479971B2 (xx)
BE (1) BE812661A (xx)
BR (1) BR7404169A (xx)
CA (1) CA988819A (xx)
CH (1) CH570562A5 (xx)
FR (1) FR2241716A1 (xx)
GB (1) GB1415815A (xx)
IL (1) IL44354A (xx)
IN (1) IN140204B (xx)
IT (1) IT1008410B (xx)
SE (1) SE389380B (xx)

Cited By (16)

* 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
US4097061A (en) * 1976-04-19 1978-06-27 Dietlein Robert W Ski insert for anchoring a ski binding screw in a ski
US4288189A (en) * 1979-08-10 1981-09-08 Yardley Products Corp. Threaded insert
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
US20020169453A1 (en) * 1998-08-07 2002-11-14 Berger J. Lee Cannulated internally threaded bone screw
US20080124920A1 (en) * 2006-11-15 2008-05-29 Clemens Fitz Fabrication method for an integrated circuit structure
US20080193252A1 (en) * 2005-04-26 2008-08-14 Tappex Thread Inserts Limited Fastener
US7819613B2 (en) 2007-10-31 2010-10-26 Carl Strom Self-tapping insert and method of utilizing the same to replace damaged bores and threads
US20100329814A1 (en) * 2007-10-31 2010-12-30 Carl Strom Self-Tapping Insert and Method of Utilizing the Same to Replace Damaged Bores and Threads
US20100329803A1 (en) * 2007-10-31 2010-12-30 Carl Strom Self-aligning thread tap and method of utilizing the same to tap existing bore holes
US20100329816A1 (en) * 2007-10-31 2010-12-30 Carl Strom Self-Tapping Insert and Method of Utilizing the Same to Replace Damaged Threads for Hydraulic and Pneumatic Applications
US20100329813A1 (en) * 2007-10-31 2010-12-30 Carl Strom Self-Tapping and Self-Aligning Insert to Replace Damaged Threads
US20110094977A1 (en) * 2009-10-27 2011-04-28 Quanta Computer Inc. Supporting rack with adjustable torsion
US8647038B2 (en) * 2009-01-07 2014-02-11 Illinois Tool Works Inc. Fastener with shaving inhibitor
US11076901B2 (en) 2017-04-21 2021-08-03 DePuy Synthes Products, Inc. Angled flutes in cannulated bone screws

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2703433A1 (de) * 1977-01-28 1978-12-07 Schumacher Wilhelm Kg Gewindeformende schraube sowie verfahren zum herstellen derselben und walzbacke zur durchfuehrung des verfahrens
FR2460168A1 (fr) * 1979-07-02 1981-01-23 Groov Pin Corp Procede de fabrication d'elements taraudes et autotaraudeurs lobulaires
DE3311378C1 (de) * 1983-03-29 1984-08-23 Precision Fasteners Gesellschaft für Verbindungstechnik mbH, 8450 Amberg Selbstschneidender Gewindeeinsatz
DE3717949A1 (de) * 1987-05-27 1988-12-08 Itw Ateco Gmbh Gewindeformende schraube
AU689729B2 (en) * 1995-11-25 1998-04-02 Sen-Yang Chen Screw for fibrous boards

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2278377A (en) * 1940-09-07 1942-03-31 Wrentham Products Company Tap stud or the like
US2455885A (en) * 1945-10-01 1948-12-07 Erich G Theurer Screw fastening
US3174521A (en) * 1961-01-09 1965-03-23 Lamson & Sessions Co Self-locking screw
US3251080A (en) * 1963-04-17 1966-05-17 Wilfred J Sharon Tool for forming screw threads by a cutting action followed by a swaging action

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2278377A (en) * 1940-09-07 1942-03-31 Wrentham Products Company Tap stud or the like
US2455885A (en) * 1945-10-01 1948-12-07 Erich G Theurer Screw fastening
US3174521A (en) * 1961-01-09 1965-03-23 Lamson & Sessions Co Self-locking screw
US3251080A (en) * 1963-04-17 1966-05-17 Wilfred J Sharon Tool for forming screw threads by a cutting action followed by a swaging action

Cited By (19)

* 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
US4097061A (en) * 1976-04-19 1978-06-27 Dietlein Robert W Ski insert for anchoring a ski binding screw in a ski
US4288189A (en) * 1979-08-10 1981-09-08 Yardley Products Corp. Threaded insert
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
US20020169453A1 (en) * 1998-08-07 2002-11-14 Berger J. Lee Cannulated internally threaded bone screw
US20080193252A1 (en) * 2005-04-26 2008-08-14 Tappex Thread Inserts Limited Fastener
US20080124920A1 (en) * 2006-11-15 2008-05-29 Clemens Fitz Fabrication method for an integrated circuit structure
US7819613B2 (en) 2007-10-31 2010-10-26 Carl Strom Self-tapping insert and method of utilizing the same to replace damaged bores and threads
US20100329814A1 (en) * 2007-10-31 2010-12-30 Carl Strom Self-Tapping Insert and Method of Utilizing the Same to Replace Damaged Bores and Threads
US20100329803A1 (en) * 2007-10-31 2010-12-30 Carl Strom Self-aligning thread tap and method of utilizing the same to tap existing bore holes
US20100329816A1 (en) * 2007-10-31 2010-12-30 Carl Strom Self-Tapping Insert and Method of Utilizing the Same to Replace Damaged Threads for Hydraulic and Pneumatic Applications
US20100329813A1 (en) * 2007-10-31 2010-12-30 Carl Strom Self-Tapping and Self-Aligning Insert to Replace Damaged Threads
US8052360B2 (en) 2007-10-31 2011-11-08 Carl Strom Self-aligning thread tap and method of utilizing the same to tap existing bore holes
US8439617B2 (en) 2007-10-31 2013-05-14 Carl Strom Self-tapping and self-aligning insert to replace damaged threads
US8647038B2 (en) * 2009-01-07 2014-02-11 Illinois Tool Works Inc. Fastener with shaving inhibitor
US20110094977A1 (en) * 2009-10-27 2011-04-28 Quanta Computer Inc. Supporting rack with adjustable torsion
US11076901B2 (en) 2017-04-21 2021-08-03 DePuy Synthes Products, Inc. Angled flutes in cannulated bone screws
US11751926B2 (en) 2017-04-21 2023-09-12 DePuy Synthes Products, Inc. Angled flutes in cannulated bone screws

Also Published As

Publication number Publication date
DE2415941B2 (de) 1976-12-02
CA988819A (en) 1976-05-11
DE2415941A1 (de) 1975-03-20
IL44354A (en) 1977-01-31
AU7729175A (en) 1976-07-15
AR198734A1 (es) 1974-07-15
IN140204B (xx) 1976-09-25
FR2241716A1 (xx) 1975-03-21
BR7404169A (pt) 1976-02-03
BE812661A (fr) 1974-07-15
IL44354A0 (en) 1974-06-30
CH570562A5 (xx) 1975-12-15
GB1415815A (en) 1975-11-26
SE7402991L (xx) 1975-02-24
AU479971B2 (en) 1976-07-15
IT1008410B (it) 1976-11-10
SE389380B (sv) 1976-11-01

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