US3796079A - Method and apparatus for making a fastener - Google Patents

Method and apparatus for making a fastener Download PDF

Info

Publication number
US3796079A
US3796079A US00277388A US3796079DA US3796079A US 3796079 A US3796079 A US 3796079A US 00277388 A US00277388 A US 00277388A US 3796079D A US3796079D A US 3796079DA US 3796079 A US3796079 A US 3796079A
Authority
US
United States
Prior art keywords
forming
shank
workpiece
rotating
roller
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
US00277388A
Other languages
English (en)
Inventor
J Wedler
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.)
Russell Burdsall and Ward Corp
Original Assignee
Lamson and Sessions Co
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 Lamson and Sessions Co filed Critical Lamson and Sessions Co
Application granted granted Critical
Publication of US3796079A publication Critical patent/US3796079A/en
Assigned to RUSSELL, BURDSALL & WARD CORPORATION reassignment RUSSELL, BURDSALL & WARD CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: LAMSON & SESSIONS CO. THE
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/64—Making machine elements nuts
    • B21K1/70—Making machine elements nuts of special shape, e.g. self-locking nuts, wing nuts
    • B21K1/702—Clinch nuts
    • 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
    • B21H7/00—Making articles not provided for in the preceding groups, e.g. agricultural tools, dinner forks, knives, spoons
    • B21H7/14—Making articles not provided for in the preceding groups, e.g. agricultural tools, dinner forks, knives, spoons knurled articles

Definitions

  • the drical head and a frustro-conical shank which extends from oneend of the head.
  • the flat side surfaces are formed on the frustro-conical shank by the improved tool which has a form roller which is rotated by a drive roller.
  • the drive roller has teeth or serrations which are pressed against the rotating insert to provide a positive driving action from the insert to the drive and form rollers.
  • the form roller has a plurality of arcuate segments arranged in an annular array about its surface. These arcuate segments are shaped so as to form the flat surfaces on the rotating shank as the form roller is rotated by the drive roller and pressed against the shank.
  • FIGS METHOD AND APPARATUS FOR MAKING A FASTENER BACKGROUND AND SUMMARY OF THE INVENTION
  • This invention relates generally to a method and apparatus for forming a plurality of surfaces about the circumference of a rotating workpiece and more specifically to a method and apparatus for forming flat surfaces on an outwardly flaring shank of an insert.
  • a self-staking insert having a polygonal shank with flat side surfaces which flare outwardly to a bluge at the outer end portion of the shank has been formed by upsetting or cold forging one end of the shank in the manner disclosed in U.S. Pat. No. 3,399,409.
  • this method is generally satisfactory for forming selfstaking inserts, problems have been encountered in forming inserts of a relatively small size. These problems arise due to the fact that small self-staking inserts are relatively difficult to handle and have very small shanks which are difficult to accurately and economically form to the desired configuration.
  • the prcsent'inven'tion provides a new and improved method and apparatus which are advantageously utilized to form a plurality of flat outwardly flaring side surfaces on the shank of a small self-staking insert.
  • the flat axially outwardly flaring surfaces are formed on the shank of the insert by cold working the shank as it is rotated by the chuck of a screw machine. This cold working is performed by arcuate segments arranged in an annular array on the periphery of :1 form roller.
  • the form roller is rotated by a drive roller which is itself rotated by engagement with the rotating workpiece.
  • Another object of this invention is to provide a new and improved method of making an insert and which includes the steps of forming an outwardly flaring shank having a generally circular cross sectional configuration and forming the shank to a non-circular cross sectional configuration as it is being rotated.
  • Another object of this invention is to provide a new and improved method for forming a workpiece and which includes the steps of pressing a circular array of arcuate segments on a form roller against the workpiece as it is being rotated to form a plurality of surfaces on the workpiece.
  • Another object of this invention is to provide a new and improved method and apparatus for forming a plu- I rality of axially extending flat surfaces about the circumference of a rotating workpiece by engaging the surface of the rotating workpiece with a rotating form roller.
  • Another object of this invention is to provide a new and improved tool for forming a plurality of surfaces on a rotating workpiece and wherein the tool includes a rotatable form roller and a drive roller which is connected with the form roller and transmits drive forces from the rotating workpiece to the form roller to rotate the form roller about its central axis, the form roller being provided with a circular array of arcuate segments which form the plurality of surfaces on the rotating workpiece during rotation of the form roller.
  • FIG. 1 is a pictorial illustration of a self-staking insert having a shank portion with flat side surfaces formed by a method and apparatus which are in accordance with the present invention
  • FIG. 2 is a sectional view, taken generally along the line 22 of FIG. 1, illustrating the engagement of the flat surfaces on the shank of the insert with a receiving plate or sheet member;
  • FIG. 3 is a schematic illustration depicting the formation of flat outwardly flaring surfaces on the rotating shank of an insert by a forming tool constructed in accordance with the present invention
  • FIG. 4 is an elevational view, taken generally along the line 4-4 of FIG. 3, further illustrating the relationship of the forming tool to the shank of the insert;
  • FIG. 8 is an enlarged plan view, taken generally along the line 88 of FIG. 7, illustrating the configuration of arcuate segments disposed in an annular array about the surface of the form roller;
  • FIG. 9 is an enlarged plan view, taken generally along the line 9-9 of FIG. 7, illustrating the configuration of a plurality of teeth arranged in an annular array about the perpheral surface of the drive roller.
  • a self-staking insert or nut 10 formed by the method and apparatus of the present invention includes a cylinderical head 12 and an outwardly projecting shank 14 which has a polygonal cross sectional configuration (FIG. 2).
  • a tapped central opening 16 extends through the insert and has internal threads for engagement with external threads on a bolt or other member. If the insert 10 is to be utilized as a bearing or support element, it is contemplated that the thread 16 would be omitted.
  • the insert 10 When the insert 10 is installed in a plate or a sheet metal member 18, the insert acts as its own punch to form a hole in the plate. Thus, the insert 10 is pressed against the plate 18 by a ram or other tool with sufficient force to cause a tapered leading end portion 20 of the shank 14 to punch a circular hole 22 in the plate. As this occurs, the shank 14 enters the hole 22 and the head 12 presses the metal of the plate 18 into tight engagement with flat outwardly flaring side surfaces 24 on the shank 14.
  • the flat surfaces 24 of the polygonal shank 14 engages the metal plate l8and holds the insert 10 against rotation in the hole 22.
  • the flat surfaces 24 extend axially between the inner and outer end portions of the shank 14.
  • the flat surfaces are disposed in transversely extending planes which intersect in a radially extending plane through the shank 14 of the insert 10 (FIG. 2).
  • the general configuration of the insert 10 and the manner in which it cooperates with the plate 18 is disclosed in US. Pat. No. 3,399,705 therefore will not be further described herein in order to avoid prolixity of description.
  • the insert 10 is made in a known screw machine having a chuck 28 which rotates a pieceof bar stock 30 (FIG. 3).
  • a blank 34 having a cylinderical head 36 and frustro- "conical shank 38, corresponding to the head 12 and shank 14 of the insert 10, is formed on the outer or leading end of the bar stock 30 with known tools.
  • the flat side surfaces 24 are then formed on the shank 38 with a forming tool 42.
  • the forming tool 42 includes a circular form roller 46 which is rotated by circular drive roller 48.
  • the drive roller 48 is rotated by engagement with the rotating bar stock 30.
  • arcuate segments 52 arranged in a circular array on a scalloped forming surface 54 cold work the shank 38 to form the flat surfaces 24.
  • the forming tool 42 When the flat surfaces 24 are to be rolled on the circular shank 38 of the blank 34, the forming tool 42 is moved radially inwardly toward the blank by a suitable cross slide orother device 58 on the screw machine. As the forming tool 42 is moved toward the blank 34, the drive roller 48 is moved into engagement with an annular bottom or inner surface 62 of a groove 64 at the inner end of the head of the blank (FIG. 3). Since the blank 34 is being rotated by the chuck 28, the drive roller 48 is rotated by engagement with the blank. Rotation of the drive roller 48 is transmitted to the form roller 46 by connecting screws 68 and pins 70 (FIGS. 6 and 7) which fixedly interconnect the drive roller and form roller.
  • each of the arcuate segments 52 Due to the relative rotation between theshank 38 and the form roller 46, the crest 76 of each of the arcuate segments 52 is moved in turn into engagement with the surface 78 of the shank. This results in the formation of a plurality of flat spots about the circumference of the shank 38. Initially the crests 76 of the arcuate segments 52 will barely engage the outer surface 78 of the shank 38. Therefore, each of the flat spots formed by the arcuate segments 52 will initially have a very small circumferential extent and will be separated from an adjacent flat spot by a circular arc formed by a portion of the shank surface 78.
  • the arcuate segments 52 slope'or taper inwardly atthe same angle as the surface 78 of the shank 38 (see FIG. 3) so that each of the flat spots extends from the head 36 of the blank 34 to a radially extending outer end face '80 of the blank.
  • each of the flats formed in the frustro-conical of the surface 78 of the shank 38 is increased by continuing the movement of the form roller 46 radially inwardly toward the central axis 84 about which the bar stock 30 is being rotated by the chuck 28 (FIG. 3).
  • the arcuate forming segments 52 are moved inwardly toward the center of rotation of the blank 34, the extent of engagement of the arcuate segments with the frustro-conical surface 78 of the shank 38 increases with a resulting increase in the circumferential extent of each of the flats and a decrease in the extent of thecircular segments of the surface 78 between the flats.
  • the fully formed flat surfaces 24 extend from a bottom surface 84 of the head 36 to the-face end surface 80 of shank 38.
  • the arcuate segments 52 are formed about axes which slope inwardly toward the center of rotation of the form roller 46 at the same angle as the surface 78 of the shank 38 slopes inwardly toward the axis of rotation 84 of the blank 34. Therefore, each of the arcuate forming or working surfaces on the segments 52 bottom surface 84 of the head 34 the other parallel side at the end face 80.
  • the flat surfaces will not be exactly trapezoidal since the middle of the shank 38 will tend to flow slightly outwardly toward the face surface 80 as the flat surfaces are formed in the shank.
  • the arcuate segments 52 are shaped so that the side surfaces 24 (FIG. 1) on the shank 14 of the insert are flat and form cords of a major diameter circle circumscribing the shank and tangents to a minor diameter circle inscribed within the surfaces 24.
  • the frustro-conical surface 78 I of the shank 38 flares outwardly from the head 36 to the end face 80 of the shank.
  • the flat surfaces formed in the shank 38 by the form roller 46 also flare outwardly from the head 36 to the face surface 80.
  • the form roller 46 Since the outersurfaces of the arcuate segments 52 on the form roller 46 taper inwardly at the same angle as which the shank 38 flares outwardly, the form roller can be moved radially inwardly, that is in a direction perpendicular to the axis of rotation 84 of the blank 34, to form the outwardly flaring flat surfaces on the shank. Therefore, the form roller 46 is merely subjected to radially directed pressure forces as the flat surfaces 24 are cold forged or worked in the surface 78 of the'shank 38 and the form roller will have a relatively long service life.
  • the drive roller 48 is driven by the rotating bar stock 30.
  • a circular array of teeth 90 (FIGS. 5 and 9) is formed about the periphery of the drive roller 48.
  • the teeth 90 indent the annular bottom surface 62 (FIG.- 3) of the groove 64 as the cross slide 58 moves the drive roller 48 and form roller 46 radially inwardly toward the axis of rotation 84 of the bar stock 30. This indenting action provides a positive or gear type of driving relationship between the bar stock 30 and roller 48.
  • the teeth 90 are sized so that the root or bottom portion 98 of the teeth will not have moved into engagement with the bar stock 30 prior to complete formation of the flat surfaces 24 by the forming roller 46. If the space between adjacent teeth 90 became filled with metal prior to complete formation of the flats 24 on the shank 38, the metal between the teeth 90 would block further inward movment of the drive roller 48. This would prevent form roller 46 from moving further inwardly to completely form the flat surfaces 24.
  • the teeth 90 have flank surfaces disposed at right angles to facilitate disengagement of the teeth from the bar stock 30.
  • the drive roller 48 and form roller 46 are mounted for rotation about a common support shaft or axle 102.
  • the axle 102 extends between a pair of arms 104 and 106 (see FIGS. 3 and 5) of a support mounting bracket 108.
  • the support bracket 108 is connected with the cross slide 58 by a shaft 110 (see FIGS. 3 and 4) and is held against rotation relative to the cross slide 58 by a position or locating pin 112.
  • the support bracket 108 has been illustrated as having particular configuration, it is contemplated that the support bracket could have many different configurations and could be mounted in many different ways on a suitable support, such as the cross slide 58, for movement relative to the bar stock 30.
  • the cross slide 58 is moved away from the bar stock 30 to move the drive roller 48 and form roller 46 out of engagement with the blank 34.
  • the tapered leading end portion 20 (see FIG. 1) of the insert 10 is then formed on the axially outer end portion of the shank 38 with a suitable forming or cutting tool 116 (see FIG. 3).
  • the blank 34 is then severed from the bar stock 30 with a cutting or parting tool 120.
  • the cutting or parting tool 120 is utilized to form the groove 64 during initial formation of the blank 34.
  • the drive roller 48 has a thickness which is very slightly less than the thickness of the cutting tool 120 and the teeth 90 on the drive roller can move into engagement with the bottom 62 of the groove 64. Since the drive roller 48 and the cutting tool 120 are of substantially the same thickness, the groove 64 is not unnecessarily extended along the bar stock 30 to thereby prevent wastage of material.
  • a cylinderical central passage 124 is reamed and tapped to form the central opening .16 and complete the formation of the insert 10.
  • the central passage 124 was drilled in the bar stock 30 prior to the forming of the blank 34 since the drilling of the single hole in a long piece of bar stock is easier than locating to the forces applied against the shank 38 as the flats 24 are formed by the roller 46. Depending upon the use to which the insert is to be put, it is contemplated that the central opening 16 would be left untapped.
  • the drive roller 48 and form roller 46 are axially separated by a distance equal to the axial thickness of the head 36-of the blank 34.
  • the distance between a radially extending inner side surface 128 of the drive roller 48 and a radially extending inner surface 130 of the form roller 46 is equal to the axial extent of the head 36 (FIG. 3).
  • the distance between the annular surfaces 128 and 130 varies with variations in the size of the head 12 and the insert 10.
  • the axial slope of the arcuate segments 52 of the form roller 46 and the axial extent of the arcaute segments may vary with variations in the size of the insert 10.
  • the present invention provides an improved method and apparatus for forming a plurality of surfaces about the circumference of a workpiece as the workpiece is being rotated.
  • the method and apparatus of the present invention can be used to form many different types of objects, they are advantageously used to form the insert 10 on a screw machine.
  • the form roller 46 engages the outwardly flaring shank 38 of the blank 34 and forms a plurality of outwardly flaring flat surfaces 24 about the circumference of the shank.
  • arcuate segments 52 on the form roller 46 are shaped so as to form flat surfaces 24 about a circumference of the shank 38, it is contemplated that the arcuate segments 52 could be shaped so as to form surfaces having a configuration other than the flat configuration illustrated in the drawings.
  • the form roller 46 When flat surfaces 24 are to be formed on the outwardly flaring shank 38, the form roller 46 is rotated by the drive roller 48.
  • the drive roller is itself rotated by engagement with the rotating bar stock 30.
  • the arcuate segments 52 on the form roller are pressed against the rotating shank 38 to cold forge the surfaces 24 on the shank.
  • a method of making an insert adapted to be disposed in a hole in a plate or sheet member and having a head portion and an outwardly flaring shank which is adapted to be received in the hole and is ofa noncircular cross sectional configuration throughout at least a portion of its length to enable the shank to resist rotation in the hole comprising the steps of providing a longitudinally extending piece of material, forming the head portion of the insert from the piece of material, rotating the piece of material about its longitudinal axis, and forming the outwardly flaring shank of the insert from the piece of material, said step of forming the shank including the steps forming the shank with an axially outer end portion which is spaced from the head portion of the insert and has a first circular cross sectional area which is coaxial with the longitudinal axis of the piece of material in a first radial plane extending perpendicular to the longitudinal axis of the piece of material, forming the shank with an axially inner end portion which is adjacent to the head portion of the insert and
  • steps of forming first and second noncircular cross sectional areas during rotation of the piece of material include forming a plurality of flat surfaces flaring axially outwardly from the inner end portion of the shank to the outer end portion of the shank.
  • a method as set forth in claim 1 wherein said steps of forming the shank with axially outer and inner end portions having first and second circular cross sectional areas includes the step of forming at least a portion of the shank to the configuration of a truncated cone which extends between the inner and outer end portions of the shank and has its base at the outer end portion of the shank.
  • steps of forming first and second noncircular cross sectional areas during rotation of the piece of material include forming the first and second noncircular areas to a polygonal configuration.
  • a method as set forth in claim 1 further including the step of providing a tool having a circular drive roller and a circular form roller, said steps of forming the first and second noncircular cross-sectional areas during rotation of the piece of material including the steps of pressing the circular drive roller against the rotating piece of material at a location axially displaced from the shank of the insert to rotate the drive roller under the influence of forces transmitted to the drive roller from the rotating piece of material, rotating the form roller under the influence of forces transmitted from the drive roller to the form roller, and pressing the form roller against the shank of the insert.
  • step of forming the head portion of the insert includes the step of forming a circular groove in the piece of material adjacent to an end of the head portion which is opposite from the shank of the insert, said step of pressing the circular drive roller against the rotating piece of material including the step of pressing a circular peripheral surface of the drive roller against an inner surface of the circular groove.
  • a method as set forth in claim 1 wherein said steps of forming the first and second noncircular cross sectional areas during rotation of the piece of material includes the step of simultaneously cold working the inner and outer end portions of the shank.
  • a method as set forth in claim 1 further including the step of providing a form roller having generally circular working surface on which a plurality of arcuate segments are formed, said step of forming the first and second noncircular cross sectional areas during rotation of the workpiece including the step of pressing the working surface of the form roller against the shank of the insert and forming the plurality of outwardly flaring surfaces by pressure engagement of the arcuate segments with the shank of the insert.
  • a method comprising the steps of rotating a workpiece about its central axis;'forming an outwardly flaring section on the rotating workpiece, said step of forming an outwardly flaring section on the rotating workpiece including the steps of forming the outwardly flaring section with one end portion which has a first circular cross sectional area which is coaxial with the central axis of the workpiece and which is disposed in a first radial plane extending perpendicular to the central axis of the rotating workpiece and forming the outwardly flaring section with a second end portion which has a second circular cross sectional area which is smaller than the first circular cross sectional area and is coaxial with the central axis of the rotating workpiece and which is disposed in a second radial plane extending perpendicular to the central axis of the rotating workpiece, providing a tool having a generally circular drive roller and a form roller having a generally circular working surface which is at least partially formed by a circular array of arcuate segments having centers disposed radially outwardly
  • a method as set forth in claim 10 further including the step of moving both the form roller and the drive roller toward the central axis of the workpiece to increase the circumferential extent on the rotating workpiece of the outwardly flaring surfaces formed by the arcuate segments of the form roller and to increase the extent to which the teeth on the drive roller indent the workpiece.
  • step of forming a plurality of outwardly flaring surfaces on the workpiece includes the step of forming a plurality of flat surfaces which flare outwardly from said first end portion to said second end portion.
  • a method as set forth in claim 12 wherein said step of pressing each of the arcuate segments on the rotating form roller in turn against the rotating workpiece includes the step of moving the circular array of arcuate segments radially toward the central axis of the rotating workpiece.
  • a tool for forming a plurality of outwardly flaring surfaces on a rotating workpiece comprising a base, a forming roller, means for rotatably connecting said forming roller with said base and for enabling said forming roller to rotate about its central axis, and drive means for rotating said forming roller about its central axis, said forming roller including a plurality arcuate segments disposed in a circular array, each of said arcuate segments having anarcuate forming surface disposed on a radially outer portion of said formin'g roller, each said forming surfaces sloping toward the central axis of the forming roller and extending from a first end portion of the forming roller at which crests of the arcuate segments extend tangentially to a circle having a first diameter to a second end portion of the forming roller at which crests of the arcuate segments extend tangentially to a circle having a second diameter which is smaller than said first diameter.
  • An apparatus for forming a plurality of axially extending and inwardly tapered surfaces on a workpiece comprising chuck means for rotating the workpiece about its central axis, and forming tool means for forming a plurality of surfaces around the circumference of and extending axially along the workpiece as it is rotated by said chuck means with each of the surfaces being disposed in planes which intersect each other in a plane extending perpendicular to the central axis of the workpiece, said forming tool means including drive roller means for engaging the workpiece as it is rotated by said chuck means to effect rotation of said drive roller means about its central axis at a speed which is a function of the speed at which said chuck means rotates the workpiece, form roller means disposed in a coaxial relationship with said drive roller means for forming the plurality of tapered surfaces on the workpiece as it is rotated by said chuck means, and
  • said form roller means including a generally circular body, means for supporting said body for rotation about its central axis, and a circular array of arcuate segments disposed on the periphery of said body, each of said arcuate segments defining an arcuate forming surface which extends transversely to the central axis of said body and is moved in turn into engagement with the workpiece during rotation of the workpiece by said drive roller means to form the plurality of tapered surfaces on the workpiece by cold working the workpiece, each of said arcuate forming surfaces including an outer portion having a first crest diameter for forming a first portion of the workpiece to a first non-circular cross sectional area in a first plane extending perpendicular to the central axis of the workpiece and an inner portion having a second crest diameter which is larger than said first
  • a method of making an insert adapted to be disposed in a hole in a member and having a head portion and a shank which is adapted to be received in the hole and is of a noncircular cross sectional configuration throughout at least a portion of its length to enable the shank to resist rotation in the hole comprising the steps of providing a longitudinally extending piece of material having a generally circular cross sectional configuration throughout at least a portion of its length, forming the head portion of the insert from the piece of material, rotating the piece of material about its longitudinal axis, providing a tool having a generally circular drive roller with a plurality of radially extending teeth and a form roller disposed in a coaxial relationship with and connected to the drive roller and having a generally circular working surface which is at least partially formed by a circular array of arcuate segments having spaced apart crest portions, rotating the form and drive rollers by pressing the teeth of the drive roller against the rotating piece of material at a location disposed on a first side of the head portion, forming the shank of
  • a method as set forth in claim 18 further including the method steps of disengaging the form and drive rate the insert from the remaining portion of the piece of material.
  • step of providing a longitudinally extending piece of material includes the step of providing a piece of material having a cylinderical central passage, said method further comprising the steps of reaming and tapping a portion of the cylinderical passage disposed within an insert after forming the shank of the insert.
  • a method of making a threaded insert adapted to be disposed in a hole in a member and having a head portion and a shank which is adapted to be received in the hole and is ofa noncircular cross sectional configuration throughout at least a portion of its length to enable the shank to resist rotation in the hole comprising the steps of providing a longitudinally extending piece of material, forming the head portion of the insert from the piece of material, forming the shank of the insert from the piece of material, forming a generally cylinderical axially extending bore in the insert, and tapping at least a portion of the said bore, said step of forming the shank including the steps of forming about the circumference of the shank a plurality of longitudinally extending surfaces which extend transversely to each other and extend at least part way between inner and outer end portions of the shank, said step of forming a plurality of longitudinally extending surfaces about the shank including the steps of providing a form roller having a generally circular working surface which is at least partially formed by
  • step of providing a longitudinally extending piece of material includes the steps of providing a piece of material having a longitudinally extending passage formed therein, and said step of forming a generally cylinderical bore includes the step of reaming at least a portion of said passage after performing said step of forming the shank.
  • a method as set forth in claim 21 wherein said step of forming a plurality of longitudinally extending surfaces about the shank includes the step of forming a plurality of surfaces having longitudinal axes which extend transversely to the longitudinal axis of the piece of material and the axis about which the shank is rotated.
  • arcuate segments are portions of intersecting circles and are effective to form on the rotating workpiece a plurality of flat surfaces extending axially along the workpiece and disposed in planes which intersect each other in a radial plane extending perpendicular to the axis of rotation of the workpiece.
  • said means includes a drive roller mounted in a coaxial relationship with said forming roller, said drive roller having an outer surface means for engaging the rotating workpiece to effect rotation of said drive and forming rollers under the influence of forces transmitted to said drive roller from the rotating workpiece.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Agronomy & Crop Science (AREA)
  • Forging (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Metal Rolling (AREA)
  • Slide Fasteners (AREA)
US00277388A 1972-08-02 1972-08-02 Method and apparatus for making a fastener Expired - Lifetime US3796079A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US27738872A 1972-08-02 1972-08-02

Publications (1)

Publication Number Publication Date
US3796079A true US3796079A (en) 1974-03-12

Family

ID=23060647

Family Applications (1)

Application Number Title Priority Date Filing Date
US00277388A Expired - Lifetime US3796079A (en) 1972-08-02 1972-08-02 Method and apparatus for making a fastener

Country Status (9)

Country Link
US (1) US3796079A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JP (2) JPS5653454B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
CH (1) CH586588A5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE2336826A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR2195289A5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (2) GB1433826A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
IT (1) IT992747B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
NL (1) NL7310618A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
SE (1) SE408275B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220074443A1 (en) * 2019-07-15 2022-03-10 Rb&W Manufacturing Llc Self-clinching fastener

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1826795A (en) * 1928-06-12 1931-10-13 Western Electric Co Indenturing apparatus
US3214310A (en) * 1962-06-29 1965-10-26 Modern Engraving And Machine C Method of making embossing rolls by engraving mills
US3399409A (en) * 1966-02-10 1968-09-03 Lamson & Sessions Co Method of making a self-staking insert

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1826795A (en) * 1928-06-12 1931-10-13 Western Electric Co Indenturing apparatus
US3214310A (en) * 1962-06-29 1965-10-26 Modern Engraving And Machine C Method of making embossing rolls by engraving mills
US3399409A (en) * 1966-02-10 1968-09-03 Lamson & Sessions Co Method of making a self-staking insert

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220074443A1 (en) * 2019-07-15 2022-03-10 Rb&W Manufacturing Llc Self-clinching fastener
US11773894B2 (en) * 2019-07-15 2023-10-03 Rb&W Manufacturing Llc Self-clinching fastener

Also Published As

Publication number Publication date
JPS4945878A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1974-05-01
JPS5653454B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1981-12-18
GB1433826A (en) 1976-04-28
JPS5762832A (en) 1982-04-16
DE2336826A1 (de) 1974-02-14
SE408275B (sv) 1979-06-05
CH586588A5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1977-04-15
IT992747B (it) 1975-09-30
FR2195289A5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1974-03-01
JPS5749298B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1982-10-21
AU5879773A (en) 1975-02-06
NL7310618A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1974-02-05
GB1433827A (en) 1976-04-28

Similar Documents

Publication Publication Date Title
US3559513A (en) Hole saw
US3648508A (en) Hole saw
US3195156A (en) Method of producing thread swaging devices
US9630267B2 (en) Thread generating tool for producing a thread in a workpiece
US3429171A (en) Radius spin drill
US4209275A (en) Twist drill
US4278374A (en) Apparatus for screw-threading
US3186464A (en) Thread forming screw and method and apparatus for making the same
US3517581A (en) Self-tapping screw
US3710676A (en) Self-drilling and thread-forming screw
US2093742A (en) Circular cutting tool
US3218656A (en) Method of forming a self-tapping or thread-forming screw
US3241426A (en) Drilling and tapping screw with ragged cutting edges
US2391396A (en) Drill
US3939512A (en) Male screw-forming members
US2446846A (en) Joint construction
US3241423A (en) Fastener device having a countersink type head
US3473211A (en) Method of forming teeth on a tubular member
US3796079A (en) Method and apparatus for making a fastener
US4919577A (en) Blind fastener
US3962899A (en) Method and apparatus for making an eccentric locking collar
US3466910A (en) Method and machine for blanking ball bearings
US2790188A (en) Method of and apparatus for forming polygonal articles
US3685328A (en) Thread roll dies
US3444714A (en) Adjustable peening tool

Legal Events

Date Code Title Description
AS Assignment

Owner name: RUSSELL, BURDSALL & WARD CORPORATION, 8100 TYLER B

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:LAMSON & SESSIONS CO. THE;REEL/FRAME:003925/0073

Effective date: 19810408