US2383133A - Method of forming fastening devices - Google Patents

Method of forming fastening devices Download PDF

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US2383133A
US2383133A US429030A US42903042A US2383133A US 2383133 A US2383133 A US 2383133A US 429030 A US429030 A US 429030A US 42903042 A US42903042 A US 42903042A US 2383133 A US2383133 A US 2383133A
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protuberance
sheet
wall
screw
helix
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US429030A
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Harold W Kost
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Detroit Harvester Co
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Detroit Harvester Co
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16BDEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B37/00Nuts or like thread-engaging members
    • F16B37/04Devices for fastening nuts to surfaces, e.g. sheets, plates
    • F16B37/041Releasable devices
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S411/00Expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener
    • Y10S411/955Locked bolthead or nut
    • Y10S411/965Locked bolthead or nut with retainer
    • Y10S411/97Resilient retainer
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/18Expanded metal making

Definitions

  • This invention relates to fastening devices, and v is particularly directed to a method of forming sheet metal structures or elements for self docking threaded engagement by a screw. More particularly, the invention is concerned with the production of the self-locking thread and adjacent portions of the structure or element by a'succession of comparatively simple operations or steps.
  • An object or the invention is to produce a method of forming a self-locking thread in sheet metal structures-or elements whereby a round screw-thread receiving aperture is obtained.
  • this invention provides a method of forming a sheet metal structure or element for self-locking engagement by a screw in which a portion 01. the metal is pressed out of the normal plane of the sheet to produce an imperforate substantially frusto-conical protuberance, a hole is pierced in the end wall with the circumferential wall of the hole disposed perpendicular to the plane of the sheet, the protuberance is slit from one edge of the hole to a point adjacent the base of the protuberance.
  • the metal at one side of the slit is pressed in a direction toward the sheet so that a portion of the wall of the opening is formed into the inner or lower portion of a helix which extends progressively anduniformly to the outer or higher portion of the helix.
  • the edge wall of the opening is held in a positionperpendicular to the sheet.
  • FIG. 1 is a perspective view of a sheet metal element having a self-locking thread formed in accordance with the present invention
  • Figure 2 is a side elevation of a sheet metal element having a protuberance formed therein and illustrating the initial step in the present method
  • Figure 3 is a view similar to Figure 2 and illustrating the second step of piercing the top of the protuberance
  • Figure 4 is a view similar to Figure 2 illustrating the step of radially slitting the wall of the protuberance and forming the adjacent edge portions of the material adjacent the aperture;
  • Figures 6 and 6 are side elevations of a sheet metal structure adapted for the production of the element in accordance with a modified method constituting a part of the present invention
  • Figure 7 is a detailed sectional view of the self-locking thread formation shown in the preceding tlgures with a screw applied thereto:
  • Figure 8 is a perspective view oi a fastener having upstanding longitudinal flanges
  • Figure 9 is an enlarged longitudinal sectional view of the fastener shown on Figure 8 mounted on a supporting panel and with ascrew applied thereto;
  • Figures 10, 11 and 12 are top plan views showing respectively the steps employed in producing a fastener according to Figures 8 and 9.
  • a sheet metal element adapted for threaded engagement by a screw and produced by the method oi the present invention has been illustrated in the form of a substantially square body II, which is intended to be representative of all structures or elements which are suitable for production in accordance 'with'the present invention. It is to be understood that the body I! may take the iorm of a large panel or sheet which has formed therein one or more oi the self-locking thread formations so that the same may be of any desired shape diii'erent from that disclosed.
  • the body I! has formed therein a protuberance designated in its entirety by the numeral II, in the top or apex of which has been pierced a hole or aperture I4 and a radially extending slot or slit ll, which is provided in the wall of the protuberance, and extends from the edge of the aperture II to a point adjacent the base oi the protuberance.
  • the edge or wall of the opening it is shaped or developed, in the manner hereinafter appearing and by means or suitable tools. to take the form of a helix 01' a length substantially equal to one convolution of the thread of a screw which is to be associated with the selflocking thread formation.
  • a point I which is at the juncture of the aperture and the slot, is provided the high part of the developed helix and at a point II is provided the low part of the helix.
  • the high point II and the low point ll of the helix are axially spaced a distance equal to the pitch of the thread of the screw, which is to be associated with the structure or element represented by the member II.
  • the diameter of the finished aperture I4 is the same as that of the initially formed opening.
  • the forming operation serves to depress the metal adjacent a portion of the aperture downwardly to complete the lower half of the helix, it being noted that the lowest point of the helical wall is dispose above the normalplane of the body Ill.
  • the operations just described are preferably performed in rapid succession by a plurality of is provided with an unperforated protuberance l2 having an irregular, generally cone-shaped contour.
  • The'protuberance has a topportion 20 disposed at an angle with respect to the normal planeof the base or body ll providing'at one side thereof the height or depth required for the high point H, the adjacent wall of the protuberance including a smooth curved.
  • the opposite side of the protuberance conforms generally to that portion Just descrew has a head 32 and a threaded body orscribed, but is of a lower over-ail height for a purpose hereinafter appearing.
  • the protuberance is formed by pressing a portion of the metal out of the plane of the body III with suitably shaped cooperating dies arranged so that considerably more metal is pressed out of the plane of the body Ilito produce the high point I] than at the opposite side of the protuberance, such metal serving to embrace the upper portion of a developed helix or opening now to be described.
  • the protuberance is subsequently pierced or punched to provide an opening or aperture ll disposed at an angle with respect to the plane of the body and having parallel or cylindrical edge or wall portions substantially perpendicular to the plane of the body, as shown in Figure 3.
  • hole or opening it is preferably produced by means of a cylindrical punch so that a perfectly round aperture, as viewed from the top thereof, is provided in the protuberance, spaced a substantial distance outwardly from the plane of the body ill. Dueto the slight angularity of the top wall 20, however, it is to be noted that opposite walls of the aperture H are disposedat varyingelevations as at 21 and 28, and that the intermediatewall 29 takes the form of a portion of a helix. Portion 28 is located intermediate the high and low parts of the helix to engage a central portion successively operating dies and punches, though it will be understood that the several operations may be separately performed. Should it be necessary or advisable, an additional operation of restriking or reforming the developed structure may be performed in order to insure that no deformation has occurred.
  • shank 33 provided with a well known form of screw thread having anguiarly disposed sides 34 and 36 and a. flat root surface 38.
  • the wall of thedeveloped hole crhelix engages substantially an entire convolution of the thread provided on screw ii, the inner face or base 38 of the thread being in engagement with the opening it uniformly throughout its length.
  • the cylindrical wall of the opening I4 is flush with the base of the screw thread from the extreme upper corner or edge to the extreme lower corner or edge.
  • the high point I! of the structure being inturned by the formation of the wall portion at 24 engages the upper portion of the screw thread while the low point it being pressed downwardly and inwardly engages the end of the thread convolution below that of the high point ll while the intermediate portion of the helix engages.
  • the pierced protuberance is subsequently, provided with a slit at I 6, and the material at one side thereof pressed downwardly so that a portion of the wall of the opening is formed into the lower portion or half of the helix and to position the low point l8 thereof.
  • the high point ll, as well as the upper portion of the helix are maintained in their the protuberance II will be compressed or fiattened to a certain extent with the result thatthe edge wall of the aperture It will be forced.
  • the protuberance may be drawn to a thickness substantially equal to the distance between the threads of the particularscrew with which the structure is to be used, and subsequent operations-performed without altering such thickness of metal.
  • the sheet metal is formed with a protuberance 40 of the general form of the finished structure and including a radial slit 4!.
  • the next step in the operation consists in punching or piercing a hole 44 in the top of the protuberance and forming the adjacent wall of the protuberance into the form of a helix having a pitch approximating that of the screw, which the structure is adapted to receive.
  • This latter step is preferably preformed as a compound operation in orderthat the edge or wall 45 of the opening 44 will be disposed perpendicular to thenormal plane of the sheet, and maintained in that position during'the formation .of the adjacent metal to provide an opening of spiral form.
  • the protuberance initially formed is prefer ably made of a size and shape in which the highest point is equal to the highest point of the finished structure, the angularity of the walls similar to the finished walls, and the base of a di- I ameter equal to that of the finished base.
  • the metal required for the finished structure is initially drawn out of the plane of the body portion, and subsequent steps varying thickness as a result of any subsequent drawing or forming operation. As the entire thickness of the protuberance will enter the ,helical groove in the shank of the screw and being uniform throughout, a thread, strength will be formed.
  • the preferred operations may take place in rapid succession upon a single reciprocating movement of a compound die toward a suitable matrix, apart of the die and matrix cooperating to form the protuberance and slit, to be followed in succession by a punch to form the perforation, and a die to form the wall of the opening to produce the screw receiving aperture in-helical form.
  • a similar succession of forming and punching operations can be performed in a; progressive die, as will be clearly understood.
  • the fastener shown on Figures 8 and 9 is similar to that hereinbefore described except for the side flanges ll. which adapt the fastener for a specific use.
  • Figures 10, 11 and 12 show the meth- 0d of forming this fastener.
  • a strip of sheet metal MI is providedand from this, a section 49 of the portion 0, a surface (2 extends by a gradual curve,
  • a protuberance which may be defined as a composite involute circular protuberance, the circular portion as above indicated extending from the point a to the point b and the involute portion being the curved portion d which terminates at the inclined notch portion' d.
  • the protuberance is pierced to provide a hole 5
  • This hole is formed with a circular portion extending from the point a to substantially the point D. From the point 11' extends an in? of great Thus,[
  • curved portiond terminates at a notch portion c which is in the same general position with respect to the protuberance as the notch c above described. It will be manifest that the shape of the hole 5
  • the slot 52 is formed which extends from'the point a of the hole Iii-substantially' to the point a at the base of the protuberance.
  • the side e of the slit is then pressed in a direction toward the sheet ,49 in such a manner that a portion of the wall of the opening is'formed into the inner portion of a helix.
  • the helix extends progressively and uniformlyfto the outer portion 1.
  • the last described slitting and formingoperations are done by dies and in such a manner that the edge wall of the hole it remains unchanged and in position. at approximately right angles tothe plane of the sheet 49.
  • the formation of the flanges 4! is accomplished prior to the final forming steps of the fastener.
  • a fastener produced in accordance with this method is particularly adapted for use in connection with heavier gauge metal and the fastener can I be very satisfactorily produced to accommodate a screw formed with an acme thread.

Description

Aug. 21, 1945. H. w. KOST 2,383,133
METHOD OF FORMING FASTENING DEVIQES Filed Jan. 31, 1942 '2 Sheets-Sheet 1 INVENTOR 199M040 W K057 WMQ/QM ATTORNEY Aug. 21, 1945. V H. w. KOST 2, 33
METHOD OF FORMING FASTENING DEVICES Filed Jan. 31, 1942 2' Sheets-Sheet 2 flczz ald Inf/(m? IN V EN ZOR.
A TTORNEY Patented Aug. 2 1, 1945 Mnrnonor roamso rssrmvnw nnvrcss Harold w. xm'nlmig ham, Mich, assignor to Detroit Harvester Company, Detroit, Mich, a
corporation of Mic Application January 31, 1942, Serial No. 429,330 4 Claims. (01. 113-116) This invention relates to fastening devices, and v is particularly directed to a method of forming sheet metal structures or elements for self docking threaded engagement by a screw. More particularly, the invention is concerned with the production of the self-locking thread and adjacent portions of the structure or element by a'succession of comparatively simple operations or steps.
'An object or the invention is to produce a method of forming a self-locking thread in sheet metal structures-or elements whereby a round screw-thread receiving aperture is obtained.
In one aspect this invention provides a method of forming a sheet metal structure or element for self-locking engagement by a screw in which a portion 01. the metal is pressed out of the normal plane of the sheet to produce an imperforate substantially frusto-conical protuberance, a hole is pierced in the end wall with the circumferential wall of the hole disposed perpendicular to the plane of the sheet, the protuberance is slit from one edge of the hole to a point adjacent the base of the protuberance. The metal at one side of the slit is pressed in a direction toward the sheet so that a portion of the wall of the opening is formed into the inner or lower portion of a helix which extends progressively anduniformly to the outer or higher portion of the helix. During the final pressing operation, the edge wall of the opening is held in a positionperpendicular to the sheet.
Further objects and advantages of the inven- .tion reside in the steps and sequence of steps hereinafter more fully described and for purposes of illustration but not of limitation,-embodiments of the invention are shown on the accompany ing drawings in which a Figure 1 is a perspective view of a sheet metal element having a self-locking thread formed in accordance with the present invention;
Figure 2 is a side elevation of a sheet metal element having a protuberance formed therein and illustrating the initial step in the present method;
Figure 3 is a view similar to Figure 2 and illustrating the second step of piercing the top of the protuberance;
Figure 4 is a view similar to Figure 2 illustrating the step of radially slitting the wall of the protuberance and forming the adjacent edge portions of the material adjacent the aperture;
Figures 6 and 6 are side elevations of a sheet metal structure adapted for the production of the element in accordance with a modified method constituting a part of the present invention Figure 7 is a detailed sectional view of the self-locking thread formation shown in the preceding tlgures with a screw applied thereto:
Figure 8 is a perspective view oi a fastener having upstanding longitudinal flanges;
Figure 9 is an enlarged longitudinal sectional view of the fastener shown on Figure 8 mounted on a supporting panel and with ascrew applied thereto; and
Figures 10, 11 and 12 are top plan views showing respectively the steps employed in producing a fastener according to Figures 8 and 9.
Referring to Figure 1 of the drawings, a sheet metal element adapted for threaded engagement by a screw and produced by the method oi the present invention has been illustrated in the form of a substantially square body II, which is intended to be representative of all structures or elements which are suitable for production in accordance 'with'the present invention. It is to be understood that the body I! may take the iorm of a large panel or sheet which has formed therein one or more oi the self-locking thread formations so that the same may be of any desired shape diii'erent from that disclosed.
The body I! has formed therein a protuberance designated in its entirety by the numeral II, in the top or apex of which has been pierced a hole or aperture I4 and a radially extending slot or slit ll, which is provided in the wall of the protuberance, and extends from the edge of the aperture II to a point adjacent the base oi the protuberance. The edge or wall of the opening it is shaped or developed, in the manner hereinafter appearing and by means or suitable tools. to take the form of a helix 01' a length substantially equal to one convolution of the thread of a screw which is to be associated with the selflocking thread formation. Accordingly, at a point I], which is at the juncture of the aperture and the slot, is provided the high part of the developed helix and at a point II is provided the low part of the helix. The high point II and the low point ll of the helix are axially spaced a distance equal to the pitch of the thread of the screw, which is to be associated with the structure or element represented by the member II.
'It is to be understood that many diillculties arise in the production or a structure such as has been illustrated in Figure 1, and it will be appreciated that the problem of so forming the aperture and adjacent portions of the metal, embraces a number of difllculties in order to produce a structure that will positively and uniformly engage the inner surface or based a screw thread without detrimental distortion of the structure I 'or severing of the screw thread upon tightening.
ness of the aperture is maintained. Furthermore,
the diameter of the finished aperture I4 is the same as that of the initially formed opening. Thus, the forming operation serves to depress the metal adjacent a portion of the aperture downwardly to complete the lower half of the helix, it being noted that the lowest point of the helical wall is dispose above the normalplane of the body Ill.
The operations Just described are preferably performed in rapid succession by a plurality of is provided with an unperforated protuberance l2 having an irregular, generally cone-shaped contour. The'protuberance has a topportion 20 disposed at an angle with respect to the normal planeof the base or body ll providing'at one side thereof the height or depth required for the high point H, the adjacent wall of the protuberance including a smooth curved. lower portion, indicated generally at 22, blending into the body 10 and from which the wall is inclined upwardly in substantially a straight line as at 23, and
slightly inwardly curved as at 24 adjacent the high point II. The opposite side of the protuberance conforms generally to that portion Just descrew has a head 32 and a threaded body orscribed, but is of a lower over-ail height for a purpose hereinafter appearing. The protuberance is formed by pressing a portion of the metal out of the plane of the body III with suitably shaped cooperating dies arranged so that considerably more metal is pressed out of the plane of the body Ilito produce the high point I] than at the opposite side of the protuberance, such metal serving to embrace the upper portion of a developed helix or opening now to be described.
The protuberance is subsequently pierced or punched to provide an opening or aperture ll disposed at an angle with respect to the plane of the body and having parallel or cylindrical edge or wall portions substantially perpendicular to the plane of the body, as shown in Figure 3. The
hole or opening it is preferably produced by means of a cylindrical punch so that a perfectly round aperture, as viewed from the top thereof, is provided in the protuberance, spaced a substantial distance outwardly from the plane of the body ill. Dueto the slight angularity of the top wall 20, however, it is to be noted that opposite walls of the aperture H are disposedat varyingelevations as at 21 and 28, and that the intermediatewall 29 takes the form of a portion of a helix. Portion 28 is located intermediate the high and low parts of the helix to engage a central portion successively operating dies and punches, though it will be understood that the several operations may be separately performed. Should it be necessary or advisable, an additional operation of restriking or reforming the developed structure may be performed in order to insure that no deformation has occurred.
Referringnow to Figure 'l, the structure pro- I .duced in accordance with the foregoing description is shown in use, and it will be noted that the body-10 with its protuberance l2'is attached to an element 30 by means of a. screw 3|. The
shank 33 provided with a well known form of screw thread having anguiarly disposed sides 34 and 36 and a. flat root surface 38. The wall of thedeveloped hole crhelix engages substantially an entire convolution of the thread provided on screw ii, the inner face or base 38 of the thread being in engagement with the opening it uniformly throughout its length. The cylindrical wall of the opening I4 is flush with the base of the screw thread from the extreme upper corner or edge to the extreme lower corner or edge. The high point I! of the structure being inturned by the formation of the wall portion at 24 engages the upper portion of the screw thread while the low point it being pressed downwardly and inwardly engages the end of the thread convolution below that of the high point ll while the intermediate portion of the helix engages.
the thread of the screw at an intermediate portion thereof. As the screw is tightened down,
of the screw thread convolution, substantially diametrically opposite the high and low parts thereof. During, the piercing operation the general contour of the initially formed protuberance is maintained so that the curvature of the wall portions indicated at 22, 23 and 24 corresponds to that provided by the initial forming operation, and the high point I! is'retained in the same relative position with respect to the base of the protuberance.
As illustrated in Figure 4, the pierced protuberance is subsequently, provided with a slit at I 6, and the material at one side thereof pressed downwardly so that a portion of the wall of the opening is formed into the lower portion or half of the helix and to position the low point l8 thereof. It is to be noted that during the. slitting and forming operation the high point ll, as well as the upper portion of the helix, are maintained in their the protuberance II will be compressed or fiattened to a certain extent with the result thatthe edge wall of the aperture It will be forced.
radially inwardly throughout its length to effect a binding action against the root surface 38 of the screw. The thickness of the sheet metal body cannot exceed or even be equal to the pitch of the screw thread or the edge of the aperture would bind against the opposed sides of the screw'thread. Likewise, forming operations cannot alter the thickness of the metal adjacent the opening or a similar result would occur. Therefore, by use of the, foregoing method, the protuberance may be drawn to a thickness substantially equal to the distance between the threads of the particularscrew with which the structure is to be used, and subsequent operations-performed without altering such thickness of metal.
Referring to Figures 5 and 6, a modified method of adapting the sheet metal structure or element for the reception of a screw, has been iiiustrated. In its completed form, the structure same relative positions and that the edge or wall of the aperture I4. is retained perpendicular to theplane of the body portion so that the roundis the same as that shown in Figure l, the steps involved in its production being somewhat modified over those hereinbefore described. First,
the sheet metal is formed with a protuberance 40 of the general form of the finished structure and including a radial slit 4!. The next step in the operation consists in punching or piercing a hole 44 in the top of the protuberance and forming the adjacent wall of the protuberance into the form of a helix having a pitch approximating that of the screw, which the structure is adapted to receive. This latter step is preferably preformed as a compound operation in orderthat the edge or wall 45 of the opening 44 will be disposed perpendicular to thenormal plane of the sheet, and maintained in that position during'the formation .of the adjacent metal to provide an opening of spiral form. By 'so punching and forming the opening, it will be clear that the danger of deforming the hole is eliminated.
The protuberance initially formed is prefer ably made of a size and shape in which the highest point is equal to the highest point of the finished structure, the angularity of the walls similar to the finished walls, and the base of a di- I ameter equal to that of the finished base. it will be noted that the metal required for the finished structure is initially drawn out of the plane of the body portion, and subsequent steps varying thickness as a result of any subsequent drawing or forming operation. As the entire thickness of the protuberance will enter the ,helical groove in the shank of the screw and being uniform throughout, a thread, strength will be formed.
The preferred operations may take place in rapid succession upon a single reciprocating movement of a compound die toward a suitable matrix, apart of the die and matrix cooperating to form the protuberance and slit, to be followed in succession by a punch to form the perforation, and a die to form the wall of the opening to produce the screw receiving aperture in-helical form. A similar succession of forming and punching operations can be performed in a; progressive die, as will be clearly understood. I The fastener shown on Figures 8 and 9 is similar to that hereinbefore described except for the side flanges ll. which adapt the fastener for a specific use. Figures 10, 11 and 12 show the meth- 0d of forming this fastener. A strip of sheet metal MI is providedand from this, a section 49 of the portion 0, a surface (2 extends by a gradual curve,
to and merges with the circular portion at the point b. Thus a protuberance is formed which may be defined as a composite involute circular protuberance, the circular portion as above indicated extending from the point a to the point b and the involute portion being the curved portion d which terminates at the inclined notch portion' d. V
In the next operation of forming the fastener as indicated on Figure 11, the protuberance is pierced to provide a hole 5| in the central portion thereof. This hole is formed with a circular portion extending from the point a to substantially the point D. From the point 11' extends an in? of great Thus,[
wardly curved surface d" which, as compared with the circular portion or portion of uniform radii a'--b', the curved surface d has decreasing radii. The curved portiond' terminates at a notch portion c which is in the same general position with respect to the protuberance as the notch c above described. It will be manifest that the shape of the hole 5| resembles that of the base of the protuberance except in reverse position.
In the next step, the slot 52 is formed which extends from'the point a of the hole Iii-substantially' to the point a at the base of the protuberance. The side e of the slit is then pressed in a direction toward the sheet ,49 in such a manner that a portion of the wall of the opening is'formed into the inner portion of a helix. The helix extends progressively and uniformlyfto the outer portion 1. The last described slitting and formingoperations are done by dies and in such a manner that the edge wall of the hole it remains unchanged and in position. at approximately right angles tothe plane of the sheet 49. Preferably the formation of the flanges 4! is accomplished prior to the final forming steps of the fastener. A fastener produced in accordance with this method is particularly adapted for use in connection with heavier gauge metal and the fastener can I be very satisfactorily produced to accommodate a screw formed with an acme thread.
This application constitutes a continuation in part of my application Serial No. 264,956 filed March 30, 1939, and entitled Method of forming fastening devices."
It is to be understood thatnumerous changes in'detailsof construction, arrangement and operation may be effected without departing from the spirit of the invention especially as defined in the appended claims.
What I claim is:
1. The method of forming a sheet metal structure or element for self-lockingengagement by a screw comprising pressing a portion of the metal out of the normal plane of the sheet to produce an imperforate substantially frusto conical protuberance with an end wall inclinedly disposed relative to the plane of the sheet. and side walls circumferential wall thereof disposed perpendicular to the plane of the sheet, radially slitting the protuberance from one edge of the hole at the highest point of the protuberance and in a direcinto the inner or lower portion of a helix which extends progressively and uniformly to the outer an imperforate substantially frusto-conical protuberance with an end wall inclinedly disposed relative to the plane of thesheet and side walls inclining gradually from the end wall to the sheet, piercing a round hole in said end wall with the circumferential wall thereof disposed perpendicular to the plane of the Sheet, radially slitting the protuberance from one edge of the hole at the highest point of the protuberance and in a direction radially thereof to a point adjacent the base of the protuberance, pressing the metal at one side of the slit in a direction toward the sheet so that a portion of the wall of the opening is formed into the inner or lower portion of a helix which extends progressively and uniformly to the outer or higher portion of the helix, holding the edge wall of the opening perpendicular to the sheet during said last pressing operation, and restriking the developed structure to insure against deformation.
3. The method of forming a sheet metal structure or element forself-locking engagement by a screw comprising pressing a portion of the metal out of th normal plane of the sheet to produce an imperforate substantially frusto-conical protuberance with an end wall inclinedly disposed relative to the plane of the sheet and side walls inclining gradually from the end wall to the sheet, piercing a hole in said end wall with the circumferential end wall thereof disposed perpendicular to the plane of the sheet, said hole being round except for a notch and an involute curved edge portion contiguous thereto, and thereafter slitting the metal from said notch to the base of the protuberance and pressing the metal at one side of the slit in a direction toward the sheet so that a portion of the wall of the opening is formed into the inner or lower portion of a helix which extends progressively and uniformly to the outer or higher portion of the helix, and during said last step holding the edge wall of the opening perpendicular to the sheet.
4. The method of forming a sheet metal structure or element for self-locking engagement by a screw comprising pressing a portion of the metal out of the normal plane of the sheet to produce an imperforate substantially frusto-conical protuberance, piercing-a hole in said end wall with the circumferential end wall thereof disposed perpendicular t the plane of the sheet, said hole being round except for a notch and an involute curved edge portion contiguous thereto, and thereafter slitting the metal from said notch to the base of the protuberance and pressing the metal at one side of the slit in a direction toward the sheet so that a portion of the wall of the opening is formed into the inner or lower portion of a helix which extends progressively and uniformly to the outer or higher portion of the helix, during said last step holding the edge wall of the opening perpendicular to the sheet, and subsequently restriking the developed structure to insure against deformation and to press the edge wall of the hole into a plane substantially parallel with the sheet and to make the extreme edge slightly thinner than the remainder, thereby to provide a portion for engaging substantially between the threads of a screw.
' HAROLD W. KOST.
US429030A 1942-01-31 1942-01-31 Method of forming fastening devices Expired - Lifetime US2383133A (en)

Priority Applications (3)

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US429030A US2383133A (en) 1942-01-31 1942-01-31 Method of forming fastening devices
US483231A US2366114A (en) 1942-01-31 1943-04-16 Method of forming screw-receiving fasteners
DEP850A DE825922C (en) 1942-01-31 1950-02-28 Fastening element for a screw and method for its manufacture

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US429030A US2383133A (en) 1942-01-31 1942-01-31 Method of forming fastening devices
US483231A US2366114A (en) 1942-01-31 1943-04-16 Method of forming screw-receiving fasteners

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2506675A (en) * 1944-11-07 1950-05-09 Letts Maurice Cole Cigar box pyramiding clip
US2697274A (en) * 1950-05-20 1954-12-21 M B Skinner Company Method of making pressed metal clamps
US2831388A (en) * 1953-11-23 1958-04-22 Prestole Corp Apertured screw receiving deformity in sheet metal
US2879569A (en) * 1954-09-23 1959-03-31 Illinois Tool Works Moulding clip
US2916807A (en) * 1953-10-15 1959-12-15 Joseph D Christian Heat exchange equipment
US3044165A (en) * 1960-05-16 1962-07-17 Prestole Corp Method of making screw-receiving fasteners or the like
US3108371A (en) * 1959-11-16 1963-10-29 Bishop & Babcock Corp Method of making sheet metal fastener
US3135313A (en) * 1961-06-23 1964-06-02 Niagara Machine & Tool Works Apparatus for forming sheet metal
US3403437A (en) * 1965-12-10 1968-10-01 Bishop & Babcock Corp Method of making a nut impression to effect a liquid-tight seal with a screw
US3648335A (en) * 1969-06-28 1972-03-14 Wolfgang Henning Hose clip
US3802476A (en) * 1972-05-08 1974-04-09 Illinois Tool Works Screw anchor
US4316426A (en) * 1979-01-19 1982-02-23 Pieter Meeusen Structure for the mooring of yachts and similar craft
US5139380A (en) * 1990-11-28 1992-08-18 Pac Fasteners Scalloped nut and method of construction
US5762560A (en) * 1993-01-20 1998-06-09 Emmett; John Eric Fastener and screw means therefor

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2678843A (en) * 1950-09-22 1954-05-18 Julius A Steffan Keeper mechanism
US2681229A (en) * 1952-02-04 1954-06-15 Bryant Grinder Corp Diaphragm chuck
DE1153944B (en) * 1955-03-12 1963-09-05 Bishop & Babcock Corp Fastening a screw in a sheet metal and a tool for making the fastening
DE964722C (en) * 1955-06-14 1957-05-29 Paul Stork K G Screw fitting for detachable connection of furniture parts
US2966711A (en) * 1956-10-04 1961-01-03 Ft Products Ltd Fasteners
US3153972A (en) * 1960-09-08 1964-10-27 Tinnerman Products Inc Fastener and method of making the same
DE4405759A1 (en) * 1994-02-23 1995-08-24 Licentia Gmbh Screw fastener for enamelled part
DE19808897B4 (en) * 1997-03-12 2008-10-30 Volkswagen Ag Twin sheet metal nut
JP4023746B2 (en) * 2005-02-23 2007-12-19 日本発条株式会社 Base for hard disk drive and manufacturing method
DE102006058174A1 (en) * 2006-12-09 2008-06-12 Dr.Ing.H.C. F. Porsche Ag Spring for a composite brake disc and composite brake disc

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2506675A (en) * 1944-11-07 1950-05-09 Letts Maurice Cole Cigar box pyramiding clip
US2697274A (en) * 1950-05-20 1954-12-21 M B Skinner Company Method of making pressed metal clamps
US2916807A (en) * 1953-10-15 1959-12-15 Joseph D Christian Heat exchange equipment
US2831388A (en) * 1953-11-23 1958-04-22 Prestole Corp Apertured screw receiving deformity in sheet metal
US2879569A (en) * 1954-09-23 1959-03-31 Illinois Tool Works Moulding clip
US3108371A (en) * 1959-11-16 1963-10-29 Bishop & Babcock Corp Method of making sheet metal fastener
US3044165A (en) * 1960-05-16 1962-07-17 Prestole Corp Method of making screw-receiving fasteners or the like
US3135313A (en) * 1961-06-23 1964-06-02 Niagara Machine & Tool Works Apparatus for forming sheet metal
US3403437A (en) * 1965-12-10 1968-10-01 Bishop & Babcock Corp Method of making a nut impression to effect a liquid-tight seal with a screw
US3648335A (en) * 1969-06-28 1972-03-14 Wolfgang Henning Hose clip
US3802476A (en) * 1972-05-08 1974-04-09 Illinois Tool Works Screw anchor
US4316426A (en) * 1979-01-19 1982-02-23 Pieter Meeusen Structure for the mooring of yachts and similar craft
US5139380A (en) * 1990-11-28 1992-08-18 Pac Fasteners Scalloped nut and method of construction
US5762560A (en) * 1993-01-20 1998-06-09 Emmett; John Eric Fastener and screw means therefor

Also Published As

Publication number Publication date
DE825922C (en) 1951-12-27
US2366114A (en) 1944-12-26

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