US1790129A - Separable fastener - Google Patents

Description

Jan. 27, 1931. P. A. ARONSON 7 1,790,129

SEPARABLE FASTENER Original Filed June 14, 1923 INVENTQR.

K/Q WM BY J7 z: I

I ATTORNEY.

Patented Jan. 27, 1931 UNITED STATES PETER A. ARONSON, OF DEVON, CONNECTICUT, ASSIGNOR T HOOKLE SS FASTENERv PATENT OFFICE COMPANY, OF MEADVILLE, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA SEPARABLE FASTENEB original application This invention relates to separable fasteners of the slider controlled type and is a division of my copending application Serial No. 645,223, filed June 14, 1923. (Patent 1,671,921, issued May 29, 1928).

An object of the invention is-to enable compressible jaw members having interlocking projection and recess portions to be made of flat strip material without requiring buli- '10 ing or other finishing operations after the fastener members are set on the stringer. Another object of the invention is to construct such a member so as to require a minimum number per unit length of tape. A-further object of the invention is to provide an improved holding power on the corded edge of the tape without cutting either the cord or tape by providing each interlocking mem ber with spaced clamping jaws. Another object is to provide flexibility, whereby the engaged stringers can be bent laterally without disengagement or distortion, as such function is very essential in fasteners for many uses. In the several forms of the invention shown herein for purposes of illustration, the interlocking members are made from successive pieces of wire of generally fiattened cross section .by being cut oil to the the desired length, then bent up after being stamped or perforated to provide a shell type of member each comprising separated pairs of compressible jaws for clamping to a tape, an oppositely disposed recess and projection, a. bridging element connecting the spaced pairs of jaws, and slider guiding meansparallel with the tape and forming a track on which the slider moves.

According to a feature of the invention, the bridging element which connects the spaced pairs of jaws forms the slider guiding mcansQthe interlocking projection and recess being formed in outwardly extending end portions of the locking member. This construction provides a. firm grip between opposite interlocking members when interlocked, facilitates locking and unlocking, and increases lateral flexibility. The number of interlocking members per unit length of tape may be easily varied, which is of 'ad-' filed'June 14, 1923, Serial No. 645,223, and in Great Britain June 6, 1924 Divided and this application filed January 23, 1928. Serial No. 248,676. Y

number of interlocking members per unit length is desirable, while for other uses a minimum number of such members is wanted. Either requirement may be fulfilled simply by changing the dimensions of the rectangle into which the metal strip is bent. I It is important in this type of fastener that the locking members be clamped securely on the tape so as not to slip longitudinally or transversely, and yet they must not be clamped so tightly as to cut either the cord or tape. The corded edge of the tape is compressed or flattened by the compression of the jaws which causes the cord to bulge on either side. In this invention, by having each locking member held in place by. two pairs of spaced clamping jaws, the relative swelling of the tape within the locking member and between these spaced jaws is effective in holding the members securely in position. With such an arrangement, the clamping force may be distributed between the two pairs of jaws requiring less clamping action in each pair whereby likelihood of cutting is lessened as well as the danger of the tape not lying flat.

Referring to the drawing:

Fig. 1 shows one embodiment of my ;invention in a partially closed fastener;

Fig. 2 is a detail of one of the lockingmembers illustrated in ig. 1;

Fig. 3 is a bottom plan View of the locking member of Fig. 2 showing the same secured to a tape;

Fig. 4 is an end View of the locking member shown in Fig. 2;

Fig. 5 is a developed plan view of the locking member before being bent;

Fig. 6 is a developed plan view of another form of locking member before being bent prising an interlocking projection 14 stan'iped -tached to the stringers.

on one side and a' recess 15 with which the opposite locking members cooperate. The flat wire blank from which these members are formed has substantially parallel longitudinal edges and jaws 16 and 17 directly connected by a bridging element 18 which bridging element at the same time forms a guiding means or track on which the slider 13 moves, as shown in Fig. 1. The projection 14 is formed by bending an end portion of the strip while the recess 15 is also located adjacent the end portion. The portions of the strip containing the recess and projection are shown in Figs. 1 to 4 as being in the form of fingers angularly disposed to the plane of the jaws 16 and 17 and are disposed at substantially the same angle. It will be noted that the recessf-15 and the projection 14 are centrally located, that is, substantially midway between the side edges of the element as viewed in Fig. 4. As seen in Figs. 2 and 3,

it will also be noted that the projection extends out further from the jaws than the recess, thus providing a staggered interlocking relation. As shown in Fig. 5, the jaw members 16 and 17 are formed by stamping out portions to fit the corded edges of the tape, and these portions are connected by the slot 19 with intermediate inwardly extended portions20. After being bent to overlapping position the pairs of jawsj 16 and 17 may be spread to receive the corded edge of the tape and then clamped thereon with the flat ends of the portions 20 gripping the opposite faces of the tapelO. In this construction the recess 15 is substantially larger than the projection 14 so that each projection may easily enter the cooperating recess and move freely therein without coming apart. This reduces the friction between the cooperating members and increases the flexibility in locking and unlocking and in lateral flexing. When the closed fastener is stretched or otherwise put under strain the cooperating locking members tend to ride one on the other and thus cumulatively increase the locking eflect due to the inability of the members to longitudinally separate at their rear ends where atp The strain at the back due to the riding at the front is taken up byslight tension on\ the tape between the members. This action is promoted by reason of the angular position of the cooperating projection and recess portions.

In the form of the invention illustrated in Figs. 6 to 9, inclusive, each locking member 22 is likewise bent from a flat wire blank provided with jaw portions 23 and 24, a projection '25 and a recess 26; In this form the metal blank is bent to form a substantially closed rectangle, that is, it is provided with two bridging portions 27 and.28 connecting the spaced jaw members. The projection 25 is formed by bending an end of the blank as is the case with the modification illustrated in Figs. 1 to 5, and the pairs of jaws in this locking member are formed within the blank and attached to the stringer in a manner similar to that described in the modification illustrated in Figs. 1' to '5 by stamping out the portions 29 and 30 connected by the slot 31, bending, spreading and subsequently clamping the jaws in place. Since the sides of the projection 25 are substantially straight, at least one side of the recess 26 is preferably tapered to facilitate entry of the straight walls of the projection. This tapered side of the recess is shown at 32 in Fig. 8. The bridging portions 27 lie at the back of the corded edges 11 of the stringers and form a track for guiding the slider 13.

Among the advantages of this invention may be mentioned the simplicity of construetion .whereby a fastener member is stamped from a fiat wire and bent to the desired shape without the previously necessary finishing operations, inasmuch as the sides of the wire form the side faces of the jaw.members. The number of locking members per unit length of stringer may be varied by controlling the length of .the bridging element. The use of spaced clamping jaws provides a double grip on the tape and lessens the liability of the locking member slipping along the tape, and the space between the pairs of clamping jaws provides a suitable location for a bulge in the corded edge which is caused by the clamping action of the jaws and is helpful to retain the locking member in lace. The formation of the jaws is accomp ished with a minimum waste of material. Reduced friction and longer. life for the slider are some of the advantages resulting from the increased metal track or slider guiding means provided by the bridging element of the lockmg member. Another advantage resides in the lightness of weight of this type of fastener making it especially adapted for use in largersizes. With the double grip upon the tape less clamping action in-each pair of jaws is necessary in order to prevent the locking member from moving longitudinally on the tape. With the locking members of the hollow type, it may bedesirable to use one or more overliapping flaps as illustrated, for example, in 1g. 5 of Patent No. 1,4;32,219 to Sundback, dated October 17, 1922, to prevent granular or other material from passing through the locking members, and leaking out of the container or whatever the fastener is applied to.

Various changes may be made in the detener comprising a strip of material bent back on itself, having integral means at the bend for clampingit securely on a stringer. and having locking means adjacent the-ends to engage locking means on an opposite stringer.

V 2. A locking member for a slide type fastener comprising a flatstrip of material bent back on itself, having integral means at the bend for clamping it securely to a stringer, and having a projection and recess spaced from the bent portion.

3. A locking member for a slide type fastener comprising a flat strip of material bent to provide outwardly extending ends connected by a'bridging element, said bridging element having a portion cut out to secure the member to a stringer, one of said outwardly extending ends having a projection and the other having a recess.

4. A locking member for a slide type fastener comprising a strip of material bent back on itself to provide pairs-of clamping jaws, a projection adjacent one pair and a recess adjacent the other pair, and a bridging element directly connecting said pairs of jaws,

the recess and projection being formed in' the end portions of said strip.

5. A locking member for a slide type fastener comprising a strip of material bent back on itself to provide a projection and a recess in the end portions, a bridging element connecting said end portions, and jaws in the bridging element adapted to be compressed on the corded edge of a stringer with the bridging element lying substantially parallel to said edge.

6. A locking member for a slide type fas tener comprising a fiat strip of material bent to overlapping position, having a clamping portion cut out at the bend for securing the member to a stringer. and having a projection and recess spaced from said clamping portion.

7. A locking member for a slide type-fastener having compressible jaws for clamping the member to a stringer, and separate interlocking port-ions projecting downwardly away from said jaws in substantially the same direction throughout their lengths, one of, said portions providing an interlocking projection and the other of said portions-having an interlocking recess formed therein.

8. A locking member for a slide type fastener comprising a strip of material bent back on itself toprovidc a bridging element and projection and recess portions disposed at an angle to said bridging element, and compressible jaws formed in said strip of material for clamping said member to the corded edge of a stringer with the bridging element lying adjacent and substantially parallel to said corded edge.

9. A locking member for a slide type fastener comprising a strip of material bent back on itself in the middle and having end portions, one of which is provided with a projection and the other of which is provided with a projection receivingrecess, and compressible clamping'jaws formed in said member at the bend.- I

10. A locking member for a slide type, fastener comprising a. flat strip of material bent back on itself in the middle and having outwardly extending'substantially parallel ends, one of which is provided with a projection and the other of which is provided with a projection receiving recess, and pairs of compressible clamping jaws formed in said member at the bend.

11. In a slide fastener an interlocking member comprising a strip of material bent back on itself and having. integral compressible.

means at the bend for attaching itsecurely to a fabric strip, the free ends of said strip projecting outwardly from said attaching means in a straight line and thence at an angle thereto and forming means for interlocking with cooperating members.

12. In a slide fastener a pair of stringers each comprising a fabric strip and a series of interlocking members secured to said strip, each of said members on one stringer comprising a. portion extending laterally of said stringer and provided with means for clamping it to the edge of said fabric strip and a plurality of fingers extending in the same general direction outwardly from said edge and at an acute angle thereto throughout their lengths to provide means for interlock ing with said members of the other series.

13. In a slide fastener a pair of stringers each comprising a fabric strip and a series of interlocking members secured to said strip, each of said members in one series comprising a body portion provided with compressible means for clamping it to the edge of said fabric strip, and a plurality of fingers projecting from said body portion in the same direction throughout their lengths to provide means for interlocking with members'of the other series, one of said fingers'providing an interlocking projection and the other of said fingers having an interlocking recess formedtherein.

14. In a slide fastener, the construction set forth in claim 13 wherein all of said interlocking members on both stringers are of llke construction.

15. In a slide fastener an interlocking member comprising a strip of material bent back on itself-and having means adjacent the bend forming clamping jaws compressed on the edge of said strip for attaching the member securely to the fabric strip, said strip being bent so as to form two parallel portions ex-- tending laterally of the bend and th outer portion for securing it to the edge of. said' free ends of said portions being bent so as to extendat an angle to said parallel portions.

16. In a slide fastener a pair of stringers saclrcomprising a fabric strip and a series of interlocking members secured to each of said strips, all-said interlocking members being'of the constructionset forth in claim 15.

17. In a slide fastener a pair of stringers each comprising a fabric strip and a series of interlocking members secured to said strip,

each of said members comprising a strip of material bent back on itself to form parallel portions for receiving and clamping the edge of said fabric strip, and k the ends of said strips being bent at an acute angle to said parallel portions and extending outwardly of the edge of said strip, each of said ends being formed to provide interlocking portions for cooperation with similar members of the other series. 7

18. In a slide fastener, a fabric strip, interlocking, members along the edge of said strip, each of said members having an attaching strip, an interlocking recess centrally located with respect to and set in from the side edges of the locking member and spaced from the edge of said strip, and an interlocking projection also centrally located with respect to and set in from the side edges of the locking member and spaced from the edge of the strip farther than said recess.

19. In a slide fastener, a flexible stringer, interlocking members along the edge of said stringer, each having clamping portions for 19th day of January, A. D. 1928.

securing it to the'stringer, and an interlock; ing recess and projection both centrally located with respect to and set in from the s1de edges of the locking member and spaced from the stringer and out of substantial longitudinal alinement for cooperation with. a recess and a projection of an opposite interlocking member.

Signed at Riverclifi'e, Devon, in the county of New Haven, and State of Connecticut, this PETER A. ARONSO'NQ

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