US2531053A - Fastening for bracelet-watch straps - Google Patents

Description

W" M, 195 E. KEHRER FASTENING FOR BRACELET-WATCH STRAPS Filed Sept. 20, 1945 Patented Nov. 21, 1950 UNITED FASTENING FOR BRACELET-WATCH STRAPS Edmond Kehrer, La Chaux-de-Fonds, Switzerland Application September 20, 1945, Serial No. 617,528 In Switzerland June 4, 1945 1 Claim. 1

The problem of adjusting the length of bracelet-watch straps to the different sized wrists has up to the present day not yet been satisfactorily solved. In the case of metal straps or cords as well as in the case of devices consisting of linked elements which can be folded together to shorten the strap, the adjustment has to be made by a professional man. Partly owing to the supplementary price of such adjustments, customers usually finish by going back to leather bands in two pieces, in spite of the inconvenience and annoyance of the one end hanging out after fastening with a buckle.

The present invention relates to a method of definitely solving the problem of adjusting the length of bracelet watch straps in the case of cordonnet or metal straps. The fastening comprises a clamp with long jaws which can take a certain length of strap. Owing to the possibility of providin the strap with a fastening one centimeter leng at each end, the total practical length of reserve strap amounts to two centimeters. This is quite sufiicient for adjusting the strap to a normal ladys or gentlemans wrist.

The accompanying drawing represents, by way of example, an embodiment of the fastening according to the present invention in the case of metal straps.

Fig. 1 shows a top view;

Fig. 2, a section along the line IIII in Fig. 1;

Fig. 3, a bottom view; and

Fig. 4, a section along the line IVIV in Fig. 2.

The fastening represented comprises a thin metal clamp in one piece with two jaws l and 2.

The inside of the jaw l is adjusted on the turns of the spirally wound metal strap 3 on a metal band 4.

The ends l3 of the jaws l and 2 are claw shaped with the purpose of pinching the strap 3.

The sides M of jaw l are bent to form flanges l6 running along the outside of jaw 2 and forming grooves l in which a small spring plate 8 can slide with the purpose of tightening the jaws and 2 of the clamp 9 on to the strap 3.

The one extremity of the clamp 9 forms an eye l receiving a pin l2 engagin in eyes 10 of a hook H to hinge the latter to the clamp 9.

This hook H can be clipped on to the carrying member of a, watch (not shown) to which the strap 3 is to be fixed.

It can be seen that the size of the fastening can be chosen so as to allow the former to lodge within it a certain variable length of strap with which the total length of the strap can be adjusted to the wrist.

In the case of cords it will of course be necessary to choose the shape of the jaws of the fastening corresponding to the section of the cord.

What I claim is:

A strap fastener for connecting a flat spirallywound meal strap to a wrist watch comprising a one-piece U-shaped clamp having an outer strap shaped so as to conform to the fiat spiral windings of said strap and an inner jaw of less width than said outer jaw, said outer jaw having side forming flanges running along the outside edges of said inner jaw and said jaws forming together an eye, a hook, a connection piece engaging said eye and said hook to hinge the latter tosaid clamp, a fiat member insertable between said flanges and said inner jaw for tightening said clamp on said fiat spirally-wound metal strap inserted between said two jaws, said inner jaw having its free end bent towards said outer jaw so as to engage the space between two turns of said fiat spirally-wound metal strap, and said jaws being of sufiicient length whereby a length of reserve strap can be lodged therebetween.

EDMOND KEHRER.

REFERENCES CITED The following references are of record in the 4 file of this patent:

UNITED STATES PATENTS

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