US3209383A - Fluted lobular thread-forming members - Google Patents

Fluted lobular thread-forming members Download PDF

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Publication number
US3209383A
US3209383A US138478A US13847861A US3209383A US 3209383 A US3209383 A US 3209383A US 138478 A US138478 A US 138478A US 13847861 A US13847861 A US 13847861A US 3209383 A US3209383 A US 3209383A
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US
United States
Prior art keywords
thread
lobes
lobe
lobular
root
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
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US138478A
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English (en)
Inventor
Raymond H Carlson
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.)
Textron Industries Inc
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Textron Industries Inc
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
Priority to BE621925D priority Critical patent/BE621925A/xx
Application filed by Textron Industries Inc filed Critical Textron Industries Inc
Priority to US138478A priority patent/US3209383A/en
Priority to FR907906A priority patent/FR1332430A/fr
Priority to GB33272/62A priority patent/GB1012741A/en
Priority to ES0280827A priority patent/ES280827A1/es
Application granted granted Critical
Publication of US3209383A publication Critical patent/US3209383A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
    • B23G7/00—Forming thread by means of tools similar both in form and in manner of use to thread-cutting tools, but without removing any material
    • B23G7/02—Tools for this purpose
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H3/00—Making helical bodies or bodies having parts of helical shape
    • B21H3/10—Making helical bodies or bodies having parts of helical shape twist-drills; screw-taps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/28—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools
    • B23P15/48—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools threading tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H3/00—Making helical bodies or bodies having parts of helical shape
    • B21H3/02—Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling
    • B21H3/06—Making by means of profiled members other than rolls, e.g. reciprocating flat dies or jaws, moved longitudinally or curvilinearly with respect to each other

Definitions

  • This invention relates to fluted lobular thread-forming members, such as swaging taps and the like, and to a method for manufacturing such members.
  • Taps for swaging threads in a female member as compared with taps for cutting threads in such members, have the advantages of generating a superior thread and of not producing chips during thread formation. While swaging taps have been made heretofore with lobular or noncircular cross sections to reduce the otherwise high driving torque characteristic of swaging taps they have been costly to manufacture. This high cost is due to the use heretofore of high grade tool steel in manufacture to obtain the necessary high tensile and yield strength, which use requires grinding the threads to form the desired lobular shapes.
  • Another important object of this invention is to provide a new and improved lobular thread-forming member having flutes, which will swage threads in a parent body with an exceptionally low driving torque and without cutting any chips.
  • Another object of this invention is to provide a new and improved fluted swaging tap having rolled threads, which will form substantially full threads in a parent body.
  • a fluted swaging tap having an odd number of threaded lobes, the lobes having a radius of curvature substantially less than the distance from the tap axis to the lobe extremity of the tap.
  • the tap is formed by extruding from a generally cylindrical workpiece a fluted lobular shank portion approaching the crosssectional shape of the finished tap, and then rolling the lobular shank portion between conventional thread-rolling dies.
  • This method is especially advantageous because inexpensive metal wire, or rod may be used, which is work-hardened during the extrusion and thread-rolling steps and subsequently heat-treated to produce a durable tap inexpensively as compared to the cost of manufacturing swaging taps heretofore commercially available.
  • FIG. 1 is a side view of a swaging tap made in accordance with and embodying the present invention.
  • FIG. 2 is an enlarged schematic cross section through the major threaded shank portion of the tap of FIG. 1 as seen within a threaded pilot hole in a female member.
  • FIG. 3 is an enlarged end view of the tap of FIG. 1.
  • FIG. 4 is a side view of a tap blank following the second forming operation.
  • FIG. 5 is an enlarged cross-sectional view of the tap blank of FIG. 4.
  • FIG. 6 is a side view of the initial cylindrical blank from which the illustrated thread-forming member is produced.
  • FIG. 7 is a side view of the tap blank following the first forming operation.
  • FIG. 8 is a sectional view of the extrusion die within which the blank of FIG. 4 is formed.
  • FIG. 9 is a schematic representation of one means for rolling threads on the tap blank of FIGS. 3 and 4.
  • FIG. 10 is a schematic view of the work-entering portion of a screw embodying the present invention.
  • FIG. 11 is an enlarged side view of the threaded portion of the tap of FIG. 1.
  • a tap 15 having a round cylindrical shank portion 17 and a lobular threaded shank portion 20 including a slightly tapered work-entering portion 21.
  • the tap has a blunt tip 23 at the worloentering end and a driving means, for example, the square portion 25 at the opposite end for mounting in a handle or driver.
  • the lobular shank portion 20 and work-entering end are provided with a rolled thread formation 27, which is substantially discontinuous through each thread convolution.
  • the lobular shank portion in cross section comprises an odd number of, in this instance three, convexly curved lobes 29 symmetrically arranged about the member axis and intermediate generally concave flutes or fluted surfaces 31 which may vary in width considerably depending upon the initial width of the flutes on the blank as discussed below and the depth of penetration of the ridges of the thread-rolling dies as the blank is threaded.
  • each lobe is not concentric about the tap axis but has a radius of curvature 33, at least in the outermost portion thereof, substantially less than the distance from the tap axis to the lobe extremity 35. As shown in FIG. 2, the radius of curvature is about one-half such distance. However, the relationship will vary depending upon the size of the flutes extruded in the blank as compared to the size of the lobes and the width of chamfer provided, the limits of which are discussed below.
  • the above-described tap is made from a blank 37 which approaches in cross section the configuration of the finished tap and comprises the cylindrical shank portion 17 and the generally lobular shank portion 19.
  • the effective diameter of the cross section of the lobular portion 19 of the blank is defined as the diameter of a circle 39 circumscribed about the outermost portions of the three lobes 29 as shown in FIG. 5.
  • the lobes 29 are generally convex and correspond to the number of lobes in the finished tap, being separated by the intermediate concave flutes 31.
  • the lobes of the blank are concentric about the blank axis through the major portion thereof, as for example through the arcuate surface 41, and have a radius of curvature 43 equal to one-half the diameter of such shank portion.
  • the edges 45 of each lobe adjacent the fluted surfaces 31 are chamfered and have a radius of curvature 47 substantially greater than the distance from the blank axis to the lobe extremity. In the preferred form shown this radius of curvature is about equal to the effective diameter of the lobular portion of the blank, or alternatively, twice the distance from the blank axis to the lobe extremity and has a center of curvature outside the opposite lobe extremity.
  • the blank 37 may be shaped from an initially cylindrical workpiece 48, shown in FIG. 6, in a two-stage operation.
  • the workpiece 48 which is sheared from a length of rod or wire stock, is'transferred to a first die station (not shown) Where it is transformed into the intermediate blank shape shown in FIG. 7.
  • the square driver or handle-mounting portion 25 is formed at one end, and the opposite end portion 21 is provided with a slight taper, such as degrees.
  • the cylindrical shank portion 18 is reduced in diameter slightly from the diameter of the initial workpiece to a predetermined value in order that standard thread sizes can be provided on the shank. This enables the use of a wide range of stock sizes having various initial diameters, therefore, eliminating the necessity for keeping a large inventory of one stock size on hand for each different thread size.
  • the intermediate blank is transferred to a second, extrusion die, 49, FIG. 8, wherein the blank shape shown in FIG. 4 is formed by extruding the flutes 31 in the reduced shank portion 18.
  • the die 49 is provided with an outer cylindrical cavity sidewall portion 51 of a diameter and length to receive entire workpiece of FIG. 7, an extrusion orifice 53 corresponding to the cross-sectional shape of the lobular shank portion 19 of FIG. 4, and an inner cylindrical sidewall portion 55 to receive the extruded portion of the blank.
  • a knockout pin 57 serves to eject the extruded workpiece.
  • the concave die surface 59 extends from the outer sidewall portion 51 to the orifice 53 and merges smoothly with the two portions.
  • the extrusion of the flutes in the reduced shank 18 of FIG. 7 is effected by applying endwise pressure to the square end 25 of the workpiece by means of the extrusion punch 61. Since only the flutes and chamfered edges 45 of the lobe are extruded in this die, the maximum effective diameter of the extruded shank portion 19 will be substantially the same as the cylindrical shank portion 18 so that the taper at the work-entering end 21 of the blank will be maintained.
  • the amount of extrusion which takes place in the second die 49, and thus the amount of resistance of the blank to extrusion is not so great as to cause any deformation or upsetting of the previously squared end portion 25 or the slightly reduced shank portion 18.
  • the lobular shank portion is threaded by rolling it between conventional, uniformly spaced apart thread-forming dies, 63 and 65.
  • Other thread-rolling means such as uniformly spaced apart arcuate rolling dies could likewise be used.
  • the blank form described previously and as shown in FIG. 5, will roll readily between such thread-rolling dies because the blank has an approximately uniform rolling width across the rounded lobes.
  • the chordal width 67 of the concave flutes 31 is not so great as to cause the flutes to interfere with the ability of the blank to roll between uniformly spaced apart dies. This width should not exceed substantially the chordal width 69 across the generally convex lobes, or, alternatively, the distance from the blank axis to the lobe extremity.
  • the maximum width of the flutes as shown in FIG. 5 it is desirable to provide the chamfered lobe edge portions 45 as previously described, having a greatly increased radius of curvature.
  • the concave flutes 31 may be of any depth desired consistent with strength requirements and limitations of percentage reduction imposed by extrusion.
  • this depth is defined by the distance from the member axis to the bottom of each of such flutes, which distance is substantially less than the maximum distance from such axis to the periphery of the root cylinder, or root, of the final thread at the midportion of each lobe.
  • such distance to the bottom of each flute is substantially no less than the minimum distance from the member axis to the periphery of the root cylinder.
  • the thread formation on the lobes is rolled to its final shape such that in cross section through such lobes the final curvature of the root and crest of such thread formation, at least at the midportions of such lobes, is defined by root and crest radii of curvature which are substantially less than the distance from the member axis to the lobe extremity at the corresponding root and crest, respectively.
  • root and crest radii of curvature which are substantially less than the distance from the member axis to the lobe extremity at the corresponding root and crest, respectively.
  • the radius of curvature along the sides of the lobes is immaterial due to the fact that thread forming is performed only by the outermost portions of each lobe in a manner to be described.
  • the thread root outline, or cylinder, 73 of the threaded shank and work-entering end portions in cross section is substantially of arcuate polygonal, in this case triangular, configuration having arcuate sides merging with each other substantially at the midportion of the lobes 29 and which are substantially internally tangential to the bottoms of the flutes 31. Thread rolling causes the flutes 31 to close up considerably from their original width 67, and at the same time the crest extremity 35 is raised above the original concentric surface 41 of the blank.
  • the thread depth is substantially uniform, because the thread crest and root outlines have substantially the same center of curvature through such portion.
  • the thread crest gradually vanishes into the flute and merges smoothly with the root outline 73 so that the thread is discontinuous through one thread convolution, having a zero thread depth at each flute, as illustrated more clearly in the enlarged view of FIG. 11.
  • the relationships between the thread crest, thread root, and flutes may vary considerably, the important consideration being the shape of the lobes at their midportions as previously pointed out.
  • the thread crest 71 on the lobe has a lesser radius of curvature than the distance from the tap axis to the lobe extremity and is therefore internally tangential to the circular thread root 77 generated in the parent body 79, results in the tap having a very low driving torque due to a minimum of frictional contact between the generating and generated threads, which contact occurs only along each lobe extremity 35, at least in the straight shank portion of the tap.
  • the parent body will have fully formed threads with a circular root outline 77 generated by the crest of the tap.
  • the actual formation of the thread in the parent body is caused by the tapered work-entering portion 21 of the tap of FIG. 1 which portion is shown having a decreasing height and an in creasingly unfinished thread crest toward the work-entering end.
  • the thread formation in that portion will have more than a point contact with the parent body since, as the tap rotates, each succeeding lobe extends outwardly from the axis a slightly greater distance from the preceding lobe, thus, each succeeding lobe swages a slightly deeper groove and raises a slightly higher crest in the parent body than its preceding lobe.
  • the lobe D will generate a thread represented by the are 83 and the succeeding lobe E will come into contact with the thread 83 of the parent body below the crest extremity and maintain contact along the crest of the lobe E through the are 85 to generate a deeper thread represented by the arc 87.
  • Each succeeding lobe E, F and G builds up a slightly higher thread 87, 89 and 91, respectively, in the parent body so that, in one thread convolution or 360 degrees a partial thread of the height 93 is generated.
  • a three-lobed thread-forming member is preferred under most circumstances, a five-lobed or sevenlobed member may be desirable for providing internal threads in pilot holes of extremely large diameter.
  • a thread-forming member for swaging threads in a parent body comprising,
  • lobular fluted shank portion including a tapered workentering end
  • said shank midportion in cross section comprising an odd number of symmetrically arranged roll-threaded lobes separated by intermediate concave flutes,
  • the radius of curvature of at least the outermost portion of said lobes being substantially less than the distance from said member axis to the lobe extremity substantially at the midpoint of said lobe, and the radius of curvature of the root of said lobes being substantially less than the maximum distance between said axis and said root.
  • a thread-forming member for swaging threads in a parent body comprising:
  • a thread-forming member for swaging threads in a parent body comprising:
  • said shank portion and work-entering end including three longitudinally extending threaded lobes symmetrically arranged about the member axis, separated by intermediate flutes,
  • a fluted lobular thread-forming member for swaging threads in a parent body comprising:
  • said shank portion and said work-entering end including an odd number of equally circumferentially spaced lobes extending longitudinally of the member axis separated by intermediate longitudinally extending flutes,
  • a thread-forming member according to claim 4 wherein in any cross section through said shank portion the root cylinder is of arcuate lobular cross section and the distance from the member axis to the bottoms of said flutes is less than the maximum distance from the member axis to the periphery of the root cylinder and is substantially no less than the minimum distance from said axis to the periphery of said root cylinder.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
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US138478A 1961-09-15 1961-09-15 Fluted lobular thread-forming members Expired - Lifetime US3209383A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BE621925D BE621925A (en(2012)) 1961-09-15
US138478A US3209383A (en) 1961-09-15 1961-09-15 Fluted lobular thread-forming members
FR907906A FR1332430A (fr) 1961-09-15 1962-08-27 élément lobulaire cannelé à former les filetages
GB33272/62A GB1012741A (en) 1961-09-15 1962-08-30 Improvements in or relating to thread-forming taps and the like, including their manufacture
ES0280827A ES280827A1 (es) 1961-09-15 1962-09-15 Perfeccionamientos en la fabricaciën de machos para la producciën de roscas

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US138478A US3209383A (en) 1961-09-15 1961-09-15 Fluted lobular thread-forming members

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Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3263533A (en) * 1964-08-27 1966-08-02 Textron Ind Inc Screw extractor
US3434168A (en) * 1967-09-26 1969-03-25 Maynard Mfg Co Method of making a lobular threaded fastener
US3492908A (en) * 1969-01-17 1970-02-03 Microdot Inc Thread swaging screw or bolt
US3597781A (en) * 1967-06-05 1971-08-10 Christian Eibes Self-tapping threaded bushings
US3866510A (en) * 1967-06-05 1975-02-18 Carl B H Eibes Self-tapping threaded bushings
USRE28907E (en) * 1967-06-05 1976-07-20 Self-tapping threaded bushings
US4069730A (en) * 1976-06-03 1978-01-24 Wales-Beech Corporation Thread-forming screw
US4161132A (en) * 1975-06-05 1979-07-17 Bulten-Kanthal Aktiebolog Self-tapping screw
WO1980000425A1 (en) * 1978-08-17 1980-03-20 D Veldman Self-thread creating fastener and method and apparatus for making the same
US4315340A (en) * 1978-08-17 1982-02-16 Veldman Donald R Method and apparatus for making a self-thread creating fastener
US4724694A (en) * 1984-07-05 1988-02-16 The Fastron Company Method of manufacturing a thread-forming screw
US4818165A (en) * 1986-04-23 1989-04-04 Rexnord Inc. Threaded element for use as an insert
US5842923A (en) * 1995-06-14 1998-12-01 Minebea Kabushiki-Kaisha Screw and method for its production
US5961267A (en) * 1998-06-23 1999-10-05 Textron Inc. Thread forming fastener
US20050271486A1 (en) * 2004-06-07 2005-12-08 Henderer Willard E Low torque tap
US20080219800A1 (en) * 2007-03-06 2008-09-11 Van Cor Dale E Threaded fastener and fastener system
US20090035091A1 (en) * 2007-08-03 2009-02-05 Newfrey Llc Threaded bolt and method for its production
US20090097942A1 (en) * 2007-10-11 2009-04-16 Weiss Tad A Deck screw
US20100209204A1 (en) * 2009-02-16 2010-08-19 Hilti Aktiengesellschaft Method for forming an internal thread on a base body
US20120093612A1 (en) * 2003-05-16 2012-04-19 Abbott-Interfast Corporation Fasteners for composite material
WO2016030100A1 (de) * 2014-08-26 2016-03-03 EMUGE-Werk Richard Glimpel GmbH & Co. KG Fabrik für Präzisionswerkzeuge Gewindeformwerkzeug, insbesondere gewindefurcher
WO2016030099A1 (de) * 2014-08-26 2016-03-03 EMUGE-Werk Richard Glimpel GmbH & Co. KG Fabrik für Präzisionswerkzeuge Gewindeformwerkzeug mit gotischem gewindeprofil und verfahren zur herstellung eines solchen gewindeformwerkzeugs
US12228158B2 (en) 2017-12-15 2025-02-18 Phillips Screw Company Stick fit fastener recess system
US12384007B2 (en) 2016-07-11 2025-08-12 Phillips Screw Company Fastener system with stabilizer ribs

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2610555A1 (fr) * 1987-02-05 1988-08-12 Rineau Freres Outillage Armor Taraud a guidage ameliore
USD505076S1 (en) * 2004-04-02 2005-05-17 W.M. Barr & Co., Inc. Container

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1048921A (en) * 1912-02-19 1912-12-31 Frederic E Wells Die-blank.
US2656740A (en) * 1950-11-20 1953-10-27 Emma G Bedker Method of making thread cutting taps
US2703419A (en) * 1951-03-06 1955-03-08 Barth Corp Method and tool for swaging internal threads
US2787798A (en) * 1952-11-26 1957-04-09 Rosan Joseph Swaging tool for reconditioning deformed lock threads
USRE24572E (en) * 1956-04-03 1958-12-02 Fluteless swaging tap
AT210236B (de) * 1958-07-29 1960-07-25 Strojirny A Slevarny Bohumira Gewindebohrer
US2991491A (en) * 1958-11-21 1961-07-11 Besly Welles Corp Fluteless swaging tap with sizing area increasing at a constant rate

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1048921A (en) * 1912-02-19 1912-12-31 Frederic E Wells Die-blank.
US2656740A (en) * 1950-11-20 1953-10-27 Emma G Bedker Method of making thread cutting taps
US2703419A (en) * 1951-03-06 1955-03-08 Barth Corp Method and tool for swaging internal threads
US2787798A (en) * 1952-11-26 1957-04-09 Rosan Joseph Swaging tool for reconditioning deformed lock threads
USRE24572E (en) * 1956-04-03 1958-12-02 Fluteless swaging tap
AT210236B (de) * 1958-07-29 1960-07-25 Strojirny A Slevarny Bohumira Gewindebohrer
US2991491A (en) * 1958-11-21 1961-07-11 Besly Welles Corp Fluteless swaging tap with sizing area increasing at a constant rate

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3263533A (en) * 1964-08-27 1966-08-02 Textron Ind Inc Screw extractor
US3597781A (en) * 1967-06-05 1971-08-10 Christian Eibes Self-tapping threaded bushings
US3866510A (en) * 1967-06-05 1975-02-18 Carl B H Eibes Self-tapping threaded bushings
USRE28907E (en) * 1967-06-05 1976-07-20 Self-tapping threaded bushings
US3434168A (en) * 1967-09-26 1969-03-25 Maynard Mfg Co Method of making a lobular threaded fastener
US3492908A (en) * 1969-01-17 1970-02-03 Microdot Inc Thread swaging screw or bolt
US4161132A (en) * 1975-06-05 1979-07-17 Bulten-Kanthal Aktiebolog Self-tapping screw
US4069730A (en) * 1976-06-03 1978-01-24 Wales-Beech Corporation Thread-forming screw
WO1980000425A1 (en) * 1978-08-17 1980-03-20 D Veldman Self-thread creating fastener and method and apparatus for making the same
US4235149A (en) * 1978-08-17 1980-11-25 Veldman Donald R Self-thread creating fastener and method and apparatus for making the same
US4315340A (en) * 1978-08-17 1982-02-16 Veldman Donald R Method and apparatus for making a self-thread creating fastener
US4724694A (en) * 1984-07-05 1988-02-16 The Fastron Company Method of manufacturing a thread-forming screw
US4818165A (en) * 1986-04-23 1989-04-04 Rexnord Inc. Threaded element for use as an insert
US5842923A (en) * 1995-06-14 1998-12-01 Minebea Kabushiki-Kaisha Screw and method for its production
US5961267A (en) * 1998-06-23 1999-10-05 Textron Inc. Thread forming fastener
US20120093612A1 (en) * 2003-05-16 2012-04-19 Abbott-Interfast Corporation Fasteners for composite material
US8430618B2 (en) * 2003-05-16 2013-04-30 Abbott-Interfast Corporation Fasteners for composite material
US7144208B2 (en) 2004-06-07 2006-12-05 Kennametal Inc. Low torque tap
US20050271486A1 (en) * 2004-06-07 2005-12-08 Henderer Willard E Low torque tap
US20080219800A1 (en) * 2007-03-06 2008-09-11 Van Cor Dale E Threaded fastener and fastener system
US8858144B2 (en) * 2007-03-06 2014-10-14 Dale E. Van Cor Threaded fastener and fastener system
US20090035091A1 (en) * 2007-08-03 2009-02-05 Newfrey Llc Threaded bolt and method for its production
US7988396B2 (en) * 2007-10-11 2011-08-02 Handy & Harman Deck screw
US20090097942A1 (en) * 2007-10-11 2009-04-16 Weiss Tad A Deck screw
US20100209204A1 (en) * 2009-02-16 2010-08-19 Hilti Aktiengesellschaft Method for forming an internal thread on a base body
WO2016030100A1 (de) * 2014-08-26 2016-03-03 EMUGE-Werk Richard Glimpel GmbH & Co. KG Fabrik für Präzisionswerkzeuge Gewindeformwerkzeug, insbesondere gewindefurcher
WO2016030099A1 (de) * 2014-08-26 2016-03-03 EMUGE-Werk Richard Glimpel GmbH & Co. KG Fabrik für Präzisionswerkzeuge Gewindeformwerkzeug mit gotischem gewindeprofil und verfahren zur herstellung eines solchen gewindeformwerkzeugs
US12384007B2 (en) 2016-07-11 2025-08-12 Phillips Screw Company Fastener system with stabilizer ribs
US12228158B2 (en) 2017-12-15 2025-02-18 Phillips Screw Company Stick fit fastener recess system

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Publication number Publication date
BE621925A (en(2012))
ES280827A1 (es) 1963-02-01
GB1012741A (en) 1965-12-08

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