US2788047A - Plastic nut having workpiece engaging means - Google Patents

Plastic nut having workpiece engaging means Download PDF

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Publication number
US2788047A
US2788047A US34062553A US2788047A US 2788047 A US2788047 A US 2788047A US 34062553 A US34062553 A US 34062553A US 2788047 A US2788047 A US 2788047A
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Prior art keywords
shank
anchor member
screw
head
work
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Expired - Lifetime
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George M Rapata
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Illinois Tool Works Inc
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Illinois Tool Works Inc
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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, 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
    • F16B37/043Releasable devices with snap action
    • 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, 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
    • Y10S411/913Self-expanding anchor
    • 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
    • Y10S411/918Threadless nut

Description

April 9, 1957 G. M. RAPATA 2,788,047

PLASTIC NUT HAVING WORKPIECE ENGAGING MEANS Filed March 5, 1953 INVENTOR.

United States Patent 9 2,788,047 PLASTIC NUT HAVING WORKPIECE. ENGAGING MEANS George M. Rapata, Chicago, IlL, assignor to Illinois Tool Works, Chicago, 11]., a corporation of Illinois Application March s, 1953, Serial No. 340,625

7 Claims. 01. 151-4155 The present invention relatesto a novel fastening device, and more particularly to a novel fastening device including a novel anchorage member or insert adapted to be placed within an aperture in a work piece to receiveandhold .a threaded fastener, such as a screw.

An object of the present invention is to provide a novel fastener of the above described type including a novel anchor member adapted to receive and lock a threaded member such as a screw against retrograde move ment.

Another object of the present invention is. to provide a novel anchor member into which .a threaded fastener suchas a screw may be easily inserted.

Another object of the present invention is to provide a novel anchor member of the above described type with means for spacing a plurality of work pieces and constructed to seal the aperture into which the anchor mem her is inserted.

Another object of the present invention is to provide a novel anchor member of the above described type which includes expandable portions insertable in a suitable aperture in a work piece, which anchor member is constructed so as to prevent undue shear strains from bein applied to the expandable portions.

A more specific object of the present invention is to provide-a novel anchor member of the above described type which is constructed of suitable material so as to provide an insulator.

Other objects and advantages of the present invention will become apparent from the following description and the accompanying drawings, wherein:

Fig. 1 is a perspective view, showing one form of a novel anchor member embodying the principles of this invention in position to be inserted through an aperture in a work piece;

' Fig. 2 is another perspective view, showing the anchor member of Fig. 1;

Fig. 3 is a vertical cross sectional view, showing the anchor member of Figs. 1 and 2 assembled in a work piece and a screw threaded through the anchor member and securing another work piece;

Fig. 4 is a cross sectional view taken along line 44 in Fig. 3;

Fig. 5 is a vertical cross sectional view similar to Fig. 3, but showing the anchor member before the insertion of the screw;

Fig. 6 is a side elevational view, showing another form of an anchor member embodying the features of thisinvention;

Fig. 7 is an end view of the anchor member shownin Fig. 6;

Fig. 8 is an end'view of another modified form of the present invention;

Fig. 9 is an enlarged fragmentary cross sectional view similar to Fig. 3 and showing the parts in greater detail;

Fig. 10 is a perspective view, showing another form of the present invention; I

Fig. 11 is a side elevational. view partially in cross section, showing the anchor member of Fig. 10 assembled with suitable workpieces and a screw member; and

Fig. 12 is a perspective view, showing still another modified form of the present invention.

Referring now more specifically to the drawings, wherein like parts .are designated by the same numerals throughout the various figures, one form of a fastening device 14 embodying the; features of this invention is shown in Figs.pl through 5 and includesa novel anchor member 16 and ascrew. 18. The anchor member 16 may be made of any suitable material which is softer-than the material of the screw: and is preferably constructed of'a suitable plastic to provide desired insulating characteristics.

- The anchor member 16 includes a head portion 20 and a pair "of shank portions 22 and-24 formed integrally with and extending axially from the head portion. An axially extending bore 26 of substantially uniform diameter throughout its length is provided through the head and shank portions of the anchor member. The diameter of the bore 26 is less 'thanthe diameter of the threaded shank of screw 18 so thatas the screw is threaded into the bore, complementary threads will be formed in the sides, of the bore, and the shank portions will be spread apart, as described more fully hereinbelow. The bore is provided with an enlarged mouth having bevelled sides 28 in order to-guide the end of the screw shank and facilitate the initial starting of the screw shank into the bore.v

It should be noted that the shank portions 22 and 24 are.'constructed so as to provide a generally rectangular exterior surface so that upon insertion of the shank portions through a suitable rectangular opening 30' in a Work piece 32, the anchor member will be held against rotation during the application of the screw 18. Referring particularly to Fig. -5, it will be seen that'the shank portions'22 and 24 taper outwardly, as at 34 and'36, respectively, in order to provide inclined surfaces adapted to engage behind the-work piece 32 when the shank portions are expanded or spread apart, as shown in Fig. 3. In addition, it will be noted that the portions of the shanks provided by the inclined surfaces 34 and 36 are thickened to provide added strength and rigidity. The outer free ends of the shanks 22 and 24 taper inwardly, as at 38 and 40, respectively, to provide cam surfaces for facilitating insertion of the anchor member through the aperture 30. Furthermore, it will be noted that these free end portions of the shanks are relatively thin and considerably more flexible than the thickened portions of the shanks, which structure has the advantage more fully described below. i

- The screw 18 is preferably a thread cutting screw which may be of any of 'the usual constructions. In the embodi ment illustrated, the screw 18 includes a threaded shank 42 which is slotted in the usual manner, as at 44, to provide thread cutting edges. The threads at the free ends 46 of the screw shank preferably are of decreased height so that the end of the screw is' in effect tapered to facilitate insertion in the anchor member.

When utilizing the novel fastener of this invention, the anchor member 16 is firstas sembled with a work piece 32 by passing the shank portions through the aperture 30. The *inwardly'inclined surfaces 38 and '40 act as cams to compress the shank portions toward each other so that the thickened portions of the shanks may pass through theaperture to the position ,shownin Fig.. 5. Any'suitable workpiece 48'is then assembled over the head 206 of the anchor member, and the screw is inserted through a suitable opening in the work piece and into the anchor member A sthesc ew isthreaded into the anchor member, complementary threads are .cut 'in the walls of the bore 26, as shown best at 50 in Fig. 9. Furthermore, as the screw progresses through the anchor member, the shank portions 22 and 24 are expanded away from each other so that the inclined surfaces 34 and 36 are pressed tightly against the back of the work piece 32 to, hold securely the anchor member in place and to draw the head 20 of the anchor member securely against the face of the work piece. If desired, the work clamping surface of the head 20 may be provided with an annular recess, as at 52, to assure tight contact of the peripheral edge or flange 54 with the face of the work piece, whereby the aperture 30 is effectively sealed. It should be noted that because of the rigidity of the thickened portions of the anchor shanks, which portions are also backed up by the work piece, the threads 50 cut in the walls of the bore are of full depth for maximum strength. However, as the end of the screw progresses toward the outer thin and relatively flexible ends of the shank portions, only partial threads are formed in the walls of the bore, as shown at 56 in Fig. 9. This is because the relatively fiexible free ends of the shank portions are not sufficiently rigid to withstand the forces necessary for cutting full depth threads. It has been found that these partial threads provide an advantage in that they grip the threads of the screw under the pressure caused by the inherent resiliency in material and thereby lock the screw against retrograde movement. In order to get the full benefit of this gripping action, the shank of the screw 18 is preferably sufiiciently long so that the tapered end portion 46 thereof is located beyond the end of the anchor member when the screw is fully tightened, and only threads of full height on the screw shank are gripped by the partial threads 56 on the anchor member.

Fig. 6 illustrates an anchor member 16a, which is essentially identical to the above described anchor member 16, as shown by the application of identical reference numerals. However, in this embodiment, four shank portions 58, 60, 62, and 64 are provided and constructed so as to have a cylindrical cross section. Therefore, in order to hold the anchor member 16a against turning while the screw is being inserted, the head portion 20a is provided with a hexagonal configuration. However, it is understood that the particular shape of the head portion 20a may be modified as desired.

Fig. 8 shows an anchor member 16b embodying the novel features of this invention and which combines the features of the above described anchors 16 and 16a. Thus, the anchor member 16b is provided with four shank portions 58b, 60b, 62b, and 64b, but these shank portions are constructed to provide a rectangular cross section, whereby upon insertion within a rectangular aperture, the anchor member will be held against rotation. By providing four shank portions, as shown in Figs. 6, 7, and 8, rather than two shank portions, as shown in Figs. 1 and 2, greater flexibility may be imparted to the shank portions so that materials having a greater inherent rigidity may be utilized.

Fig. illustrates an anchor member 160, which is constructed in a substantially identical manner to the anchor member 16. However, another important feature of this invention is illustrated by this embodiment, and this feature includes a strain relief shoulder 66 between the shank portions and the head portion of the anchor member. Thus, when the anchor member 16c is assembled in a suitable work piece .320 having a recess 68 adapted to accommodate the strain relief shoulder substantially the greater portion of shear stresses is removed from relatively weak shank portions of the anchor member. It will be understood, of course, that the strain relief shoulder 66 may be applied to any of the forms of the invention illustrated and described herein and that if desired the undercut or recessed work clamping surface for providing a seal, as described with particular reference to Fig. 3, may also be provided in any of the embodiments illustrated herein.

Fig. 12 shows an anchor device 16d, which is identical to the previously described anchor device 16, except that the head 20d is of considerable axial extent to provide greater a space between the work pieces.

From the above description, it is seen that the present invention provides a simple fastening device including the novel anchor, which novel anchor may be simply and economically manufactured from an integral blank of suitable material, such as plastic, and which anchor may be easily assembled with a work piece. Furthermore, it is seen that the novel construction of the anchor permits the screw to be easily assembled therewith and effectively locks the screw against retrograde movement. The preferred form of the anchor shown in Figs. 1 through 5, which has only two shank portions, has been found to provide the greatest resistance to thread stripping and also greater locking action by the partial threads formed at the free ends of the shanks. In addition, it is seen that the novel anchor member provided by this invention may be easily held against rotation during the application of a screw thereto either by the rectangular formation of the expandable shanks or by the non-circular formed head. The novel structure of the present invention also provides an anchor member, wherein shear strains are substantially relieved from the relatively weak expandable shanks, and wherein the aperture in the work piece may be effectively sealed.

While the preferred embodiments of the present invention have been shown and described herein, it is obvious that structural details may be changed without departing from the spirit and scope of the appended claims.

I claim:

1. A one-piece plastic rivet type fastener including a four-sided shank adapted for axial insertion within a complementary work aperture, and a head extending radially outwardly from one extremity of said shank, said shank being bifurcated by a longitudinal recess which bisects the opposed peripheral sides of the shank so as to present a pair of laterally spaced, transversely yieldable shank sections having opposed longitudinal grooves along their inner surfaces defining axial continuations of a central substantially cylindrical aperture in the head for accommodating a rotary thread-forming screw, the bisected opposed peripheral sides of the shank being sufficiently flat to join adjacent sides of the shank at relatively sharp angles to provide relatively sharp meeting edges whereby to counteract tendency of the fastener to rotate in the work, said shank sections being separated by said longitudinal recess a distance less than the diameter of said central aperture whereby to provide opposed peripheral shank sides of substantial width adjacent said recess, the peripheral surfaces of said shank sections oppositely disposed from each of said longitudinal grooves also having substantial width and tapered at their free ends to facilitate initial insertion of the shank within a complemental work aperture, shoulders intermediate the head and free extremities of said yieldable shank sections cooperating with the head to secure the fastener within the work after the shank has been snapped into position within a work aperture, the peripheral surfaces defined by said opposed sides of each shank section in the vicinity of the head which intersects the shank bifurcation and the other peripheral shank surfaces being cooperatively disposed for engagement with complemental work surfaces which define a work aperture to prevent rotation of the fastener in the work when a thread-forming screw is rotatably applied thereto.

2. A one-piece plastic rivet type fastener as set forth in claim 1, wherein the free extremities of the shank sections are relatively thin as compared with the remainder of said shank sections whereby said free extremities will yield radially outwardly when the external thread of a thread-forming screw is rotated into engagemerit therewith and thus counteracting tendencies for the screw to experience retrograde rotation.

areaoa'r .3. A one-piece plastic rivet type fastener as set forth in claim 1, wherein the head of the fastener is undercut between the shank and the outer periphery of the head so as to facilitate sealing engagement of the head with the work surface.

4. A one-piece plastic rivet type fastener as set forth in claim 1, wherein the central aperture in the head is enlarged in the vicinity of the outer surface of said head to facilitate insertion within said recess of a threadforming screw.

5. A one-piece plastic rivet type fastener as set forth in claim 1, wherein a shear relief shoulder is provided at the juncture of the shank with the head.

6. A one-piece plastic rivet type fastener as set forth in claim 1, wherein the substantially cylindrical recess within the fastener is unthreaded over a substantial portion of its extent.

7. A one-piece plastic rivet type fastener including a four-sided shank adapted for axial insertion within a work aperture, a head extending radially outwardly from one extremity of said shank, said shank being bifurcated by a longitudinal recess which bisects the opposed peripheral sides of the shank so as to present a pair of laterally spaced, transversely yield-able shank sections having opposed longitudinal grooves along their inner surfaces defining axial continuations of a central substantially cylindrical aperture in the head for accommodating a rotary thread-forming screw, the bisected opposed peripheral sides of the shank being sufficiently flat to join adjacent sides of the shank at relatively sharp angles to provide relatively sharp meeting edges, said shank sections being separated by said longitudinal recess a distance less than the diameter of said central aperture whereby to provide opposed peripheral shank sides of substantial width adjacent said recess, the peripheral surfaces of said shank sections oppositely disposed from each of said longitudinal grooves also having substantial width and tapered at their free ends to facilitate initial insertion of the shank within a work aperture, shoulders intermediate the head and free extremities of said yieldable shank sections cooperating with the head to secure the fastener within the work after the shank has been snapped into position within a work aperture, and shear relief shoulder means projecting axially from the clamping side of said head and including portions extending laterally from opposed bifurcated peripheral shank surfaces, said shoulder means being shaped and disposed for engagement with complemental surfaces which define a Work aperture to oppose rotation of the fastener in the work when a thread-forming screw rotatably applied thereto.

References Cited in the file of this patent UNITED STATES PATENTS 1,816,970 Hess Aug. 4, 1931 1,978,935 Douglas Oct. 30, 1934 2,255,650 Burke Sept. 9, 1941 2,259,720 Amesbury Oct. 21, 1941 2,301,244 Bishop Nov. 10, 1942 2,333,277 Swank Nov. 2, 1943 2,387,468 Ritzel Oct. 23, 1945 2,402,287 Kearns June 18, 1946 2,415,560 Higley Feb. 11, 1947 2,542,144 Kearns Feb. 20, 1951 2,545,514 Erb Mar. 20, 1951 2,626,772 Flora Jan. 27, 1953 2,657,894 Sklenar Nov. 3, 1953

US2788047A 1953-03-05 1953-03-05 Plastic nut having workpiece engaging means Expired - Lifetime US2788047A (en)

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US2788047A US2788047A (en) 1953-03-05 1953-03-05 Plastic nut having workpiece engaging means
GB658954A GB745788A (en) 1953-03-05 1954-03-05 Improvements in anchoring screw threaded fasteners in workpieces
US2956605A US2956605A (en) 1953-03-05 1956-09-14 Plastic screw receiving insert having a circular body and a polygonal head

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US2836214A (en) * 1953-07-31 1958-05-27 Illinois Tool Works Plastic screw anchor with slotted head
US2836215A (en) * 1954-08-11 1958-05-27 Illinois Tool Works Plastic nut-like fastener with resilient wings
US2956605A (en) * 1953-03-05 1960-10-18 Illinois Tool Works Plastic screw receiving insert having a circular body and a polygonal head
DE1094049B (en) * 1958-05-31 1960-12-01 Opel Adam Ag Mother made of plastic
US2970287A (en) * 1959-04-24 1961-01-31 Gen Motors Corp Fastener assembly
US2975814A (en) * 1957-12-09 1961-03-21 George A Tinnerman Plastic anchoring fastener with diverging shanks
US3001567A (en) * 1955-10-06 1961-09-26 Adelaide E Brill Self-locking and self-sealing plastic fastening devices
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US3074134A (en) * 1961-04-14 1963-01-22 Thompson Ind Inc Fastening means
US3082807A (en) * 1956-07-27 1963-03-26 George A Tinnerman Plastic nut having metallic insert imbedded therein
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US4133532A (en) * 1975-08-12 1979-01-09 Lante Montefeltro Della Rovere Simulated target pigeon
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US4227759A (en) * 1978-03-21 1980-10-14 Pace Incorporated Container having threadable clip members and method of assembling same
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US2301244A (en) * 1942-01-28 1942-11-10 Archie G Bishop Rivet
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Cited By (61)

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Publication number Priority date Publication date Assignee Title
US3124666A (en) * 1964-03-10 Distributor having a snap-fitted rotor
US2956605A (en) * 1953-03-05 1960-10-18 Illinois Tool Works Plastic screw receiving insert having a circular body and a polygonal head
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