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Publication numberUS3658107 A
Publication typeGrant
Publication dateApr 25, 1972
Filing dateApr 1, 1971
Priority dateApr 1, 1971
Publication numberUS 3658107 A, US 3658107A, US-A-3658107, US3658107 A, US3658107A
InventorsJoseph Perina
Original AssigneeAmerican Velcro Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Self-locking system
US 3658107 A
Abstract
The self-locking system applies to two rigid members which are connected together by internally and externally threaded elements and have engaging surfaces which are flat. The self-locking arrangement is in the form of hooking elements bonded to the respective engaging surfaces.
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Description  (OCR text may contain errors)

United States Patent Perina 1 Apr. 25, 1972 [541 SELF-LOCKING SYSTEM 3,176,364 4/1965 Dritz ..24/2o4 [72] inventor: Joseph Perina, Huntington, N.Y. FOREIGN PATENTS 0R APPLICATIONS [731 Assign: America" Mmheser, 1,125,236 3/1962 Gennany ..151/34 [22] Filed: Apr. 1, 1971 Primary Examiner-Marion Parsons, Jr.

[21 Appl. No.: 130,229 Attorney-Pennie, Edmonds, Morton, Taylor & Adams [52] US. CL... ..15l/34, 24/204 ABSTRACT [51] Int. Cl ..Fl6b 39/282 The self lockin g system applles to two rigid members which [58] FleldofSearch ..24/204, DIG. l8, l5l/34,4l.7 are connected together by imemany and externally threaded elements and have engaging surfaces which are flat. The self- [56] Rem-anus Cited locking arrangement is in the form of hooking elements Nn- STATES PATENTS bonded to the respective engaging surfaces.

3,135,820 6/1964 Hallett et al. ..24/204 4 Claims, 4 Drawing Figures PATEMTEDAPR 25 m2 FIG. 4

FIG. 3

INVENTOR Joseph Perin l I l J ATTORNEYS SELF-LOCKING SYSTEM SUMMARY OF THE INVENTION By providing the flat surfaces with booking elements which engage one another when the threaded elements, such as a nut and bolt, are screwed one onto the other, as the two flat surfaces approach one another the hooking elements become engaged and fonn what amounts to a lock-washer. One important difference however is that with the usual form of lockwasher the interlocking elements do not engage one another until the connecting elements have been turned substantially to their final tight position, whereas with the self-locking system of the present invention the two rigid members become locked together by the engagement of the hooking elements before the final clamping together of the two rigid members. Thus a range of adjustability is provided throughout which the two rigid members are firmly locked together against loosenmg.

The locking force of the self-locking system can be varied in a number of ways, such for example, as by providing the flat interengaging surfaces with different numbers of hooking elements per square inch, or by using different types of hooking elements on the respective surfaces. For example, the cooperating hooking elements may be of the hook type and of the loop type respectively, or hook type elements may be used on both surfaces, or hook type on one surface and a pile type or loop type, or some other type, on the other surface. The intention however is to use a hooking element fabric or tape mounted on the cooperating flat surfaces of the two rigid members. Such a tape or fabric is manufactured as a fastener and sold under the tradename Velcro" by Velcro Corporation of 681 Fifth Avenue, New York, NY. 10022 This fabric contains many heat-set, semi-rigid nylon hooks per square inch. These hooks when pressed into a cooperating fabric capable of engaging with these hooks produce a strong fastener which can be attached and detached thousands of times by merely pressing the parts together and pulling them apart.

According to the present invention each of the flat surfaces of the two rigid members has a layer of fabric bonded thereto, one of these fabric layers having hook members and the other layer having either hook members or some other appropriate element, such as loops, projecting therefrom. Also the hook members and loop members may be bonded directly to the respective fiat surfaces of the two rigid members.

When the interengaging surfaces of the two rigid members are provided with the usual form of hooking fabric the hook members will be arranged in parallel rows. The invention provides however for placing these hooks in a generally circular arrangement so that the hooks face all in the direction in which the sheer forces are exerted.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view in central section showing two rigid members provided with the self-locking system of the invention.

FIG. 2 is an isometric view of a standard form of hooking fabric ready to be applied to the engaging surface of one of the rigid members.

FIG. 3 is a view similar to FIG. 2 of a modification, and

FIG. 4 is a vertical sectional view drawn to a larger scale.

DETAILED DESCRIPTION The rigid element shown in FIG. 1 will be referred to as a nut element and has a circular projection 11 with a central aperture 12 having internal threads 13. The second rigid member, indicated by numeral 14, in this case also has a cylindrical projection 15 and the same diameter as projection 11. Extending outwardly from the center of projection 15 is an externally threaded or bolt element 16 of appropriate diameter to fit the aperture 12. Also the internal threads 13 are of the same pitch and form to cooperate with the external threads of bolt element 16.

The cooperating faces 17 and 18 of the elements 10 and 14 are circular and are shown as having approximately the same diameter, although this is not necessary, the only essential requirement being that both surfaces should be flat. Appropriately secured to the face 17, as by bonding, there is a fabric washer 19, from the surface of which a multiplicity of hook members 20 project. On face 18 of member 14 there is a similar fabric washer 21 having a multiplicity of loops 22 projecting from its outer surface. As indicated, there are many more loops than hooks. It will be understood that although a loop type of hooking member on washer 21 is advantageous, other hooking elements as indicated above, and many others, may be used.

When the internal threads 13 and external threads 16 are engaged and the nut member 10 is screwed onto the bolt member, the surfaces of the two fabric washers l9 and 21 will be brought sufficiently close together that some of the hook elements 20 will engage some of the loop elements 22. Such engagement is shown in FIG. 4. Due to the fact that contact between the hook and loop elements occurs during a turning movement of the nut member 10 with respect to the second rigid or bolt member 14 the hook members 20 are apt to be shifted to a somewhat inclined position. Any loosening of the nut member with respect to the bolt member will tend to shift the hook members 20 to an oppositely inclined position. However even with the hook members barely entering the mass of loop members 22 a sufficient resistance to relative turning movement between the nut and bolt members exists to prevent the loosening of the nut member.

The tightening of nut member 10 with respect to the bolt member may continue until the hook members 20 have entered a considerable distance into the mass of loop members and a considerable range of adjustability is therefore provided. However, throughout this range a positive lock washer effect is produced. In other words, the parts are not only self-locking with respect to each other but selective positioning of the nut member with respect to the bolt member is available.

Referring to FIG. 2 there is here shown a washer 19 which is made from standard Velcro material with the hooks 20 facing in different directions, but with the hooks arranged in parallel rows. Under certain circumstances it may be desirable to provide an extraordinarily large locking force or sheer force between the hooking elements on the nut member and the cooperating elements on the bolt member. This can be accomplished by arranging the hook members so that they face generally in the same direction, the direction in which the locking forces are exerted. Such a construction is illustrated in FIG. 3 in which the washer 19b is made in wedge shaped sections 23 and the hooks 20b are arranged in either parallel or concentric rows with all of the hooks directed either counterclockwise (as shown) or clockwise.

Iclaim:

1. In a self-locking system for two rigid members having cooperating internally and externally threaded connecting elements and having flat engaging surfaces, the improvement in combination therewith which comprises a plurality of hooking elements bonded to each of said surfaces, said hooking elements on the respective surfaces engaging one another when said threaded elements are rotated with respect to each other to secure said rigid members together.

2. A self-locking system according to claim 1 in which the hooking elements on one of said surfaces are in the form of hooks, and those on the cooperating surfaces are in the form of loops.

3. A self-locking system according to claim 1 in which the engaging surfaces are circular in shape and the hooking elements project from fabrics bonded thereto, the improvement in combination therewith wherein the hooking elements on at least one of said engaging surfaces project from wedge-shaped sections of said fabric and the hooks thereon all face in the direction in which the locking forces are exerted.

4. A self-locking system according to claim 3 in which the hooking elements on both of said surfaces project from wedge-shaped sections of fabric, and the said elements all face in generally the same direction.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3135820 *Feb 2, 1962Jun 2, 1964Charleston Rubber CompanyFastening devices for linemen's rubber blankets
US3176364 *Oct 6, 1959Apr 6, 1965Dritz ArthurSeparable fastener
DE1125236B *Jun 14, 1958Mar 8, 1962Georg BrotzLoesbare Schrauben-Mutternverbindung
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4372224 *Feb 7, 1980Feb 8, 1983Gary J. KnostmanKnockdown furniture construction
US4430835 *Aug 20, 1981Feb 14, 1984Otis Elevator CompanyElevator cab
US4462193 *Jun 4, 1982Jul 31, 1984Otis Elevator CompanyElevator cab
US4541154 *Nov 4, 1983Sep 17, 1985Yoshida Kogyo K.K.Hooked fabric fastener tape
US4738260 *Apr 18, 1985Apr 19, 1988Travis Industries, Inc.Unintentional urination sensing device
US4760980 *Jan 19, 1984Aug 2, 1988William SharpeMethod and apparatus for patching an opening within a screen
US4916767 *Feb 18, 1988Apr 17, 1990Keisei Medical Industrial Company LimitedDevice for securing detachably filtering sheet to air bed
US5001794 *Jan 5, 1990Mar 26, 1991Keisei Medical Industrial Co., Ltd.Device for securing detachably filtering sheet to air bed
US5048160 *Apr 9, 1990Sep 17, 1991Goodrich Lewis SButton replacement device
US5152187 *May 31, 1991Oct 6, 1992Lafemina FioreLocking control device for electronic equipment & the like
US6595155Jan 24, 2002Jul 22, 2003Nelson A. Taylor Co., Inc.Combination snap and fastener
US7857565 *Jun 29, 2006Dec 28, 2010The Boeing CompanyCompensator bushing assembly for fasteners with location variability
US8562769Sep 13, 2012Oct 22, 2013Velcro Industries B.V.Forming construction underlayment
US8701264Nov 10, 2010Apr 22, 2014The Boeing CompanyCompensating for fastener location variability
US9637926Apr 8, 2009May 2, 2017Velcro BVBAMembrane roofing
US9752326 *Sep 13, 2012Sep 5, 2017Velcro BVBAMembrane roofing
US20030061781 *Oct 3, 2001Apr 3, 2003Smith Russell K.Support system for a structure
US20080003079 *Jun 29, 2006Jan 3, 2008The Boeing CompanyCompensator bushing assembly for fasteners with location variability
US20110056065 *Nov 10, 2010Mar 10, 2011The Boeing CompanyCompensating for fastener location variability
US20130000237 *Sep 13, 2012Jan 3, 2013Velcro Industries B.V.Membrane Roofing
US20150216266 *Feb 4, 2014Aug 6, 2015Brent FranklinButton replacement
WO2000013535A1 *Sep 3, 1999Mar 16, 2000Ellingson Leora LApparatus for affixing a decoration to a sock in a fixed orientation
Classifications
U.S. Classification411/81, 24/306, 411/187, 411/956, 411/190
International ClassificationF16B39/282, F16B1/00, A44B18/00
Cooperative ClassificationF16B2001/0028, Y10S411/956, A44B18/00, F16B39/282
European ClassificationA44B18/00, F16B39/282
Legal Events
DateCodeEventDescription
Apr 1, 1988ASAssignment
Owner name: VELCRO INDUSTRIES B.V., NEIUWE WETERINGSTRAAT 38,
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:VELCRO USA, INC.;REEL/FRAME:004871/0369
Effective date: 19870930
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:VELCRO USA, INC.;REEL/FRAME:004871/0369
Owner name: VELCRO INDUSTRIES B.V.,NETHERLANDS