Buckles – buttons – clasps – etc. – Strap tighteners – Strap-attached folding lever
Patent
1998-02-27
1998-11-03
Sakran, Victor N.
Buckles, buttons, clasps, etc.
Strap tighteners
Strap-attached folding lever
24 68J, 24265WS, A44C 500
Patent
active
058291040
DESCRIPTION:
BRIEF SUMMARY
This application claims priority from PCT application number PCT/CH96/00417 designating the United States, which application is hereby incorporated by reference.
The invention relates to fasteners and more particularly a fastener having a clasp for a bracelet according to the claims.
Fasteners are used in numerous different technical fields. They are e.g. used in security engineering (doors, windows, etc.) and in watch and clock making (wrist-watches). For example, wrist-watch bracelets or bands open and close by means of known fastening means such as an opening out and snap-on clasp.
Such a bracelet clasp is conventionally provided with a bar or pin and a stud for fixing strands of the bracelet and is equipped with opening out strips so as to be able to remove the wrist-watch with the bracelet closed. Said bar permits a permanent fixing of a first strand of the bracelet to the clasp and said lug permits the temporary fixing of another strand of the bracelet to the clasp by introducing the stud into a hole in the said free strand. The bar and the stud are attached to different strips, articulated with respect to one another through a common hinge, permitting an increase in the diameter of the bracelet on separating and pivoting the two strips so as to be able to remove the bracelet without undoing the temporary fixing of the strand.
Hereinafter, discussion will be limited to the advantages and disadvantages of a wrist-watch fastener having an opening out and snap-on clasp. A description will be given of disadvantages associated with a stable fixing of the free strand to the stud of a clasp strip, a strong construction of the elements of the clasp and a random length regulation of the bracelet in a reliable and easy manner.
The fixing of the free strand is not very reliable when the stud used is articulated with respect to a support strip and when said mechanism has modest dimensions so as to be deformable and damageable under the effect of the torque and tensile forces intercepted by the bracelet. The opening of the clasp and the regulation of the length of the bracelet take place in several stages and require a large number of elements on the one hand for carrying out the unlocking of the strips of the clasp and on the other for undoing the fixing of the free strand of the bracelet.
A solution permitting an easy fixing of the free strand of the bracelet is described in Swiss patent 661,186 by incorporating a stud into a solid cover articulated with respect to a first support strip permitting the fixing of a free strand by pivoting the cover towards said support strip and introducing the stud into a hole in said strand. The locking of the clasp strips is obtained by notching a second stud placed on the first support strip in an opening of a second clasp strip.
This construction suffers from the disadvantage that the torque and tensile forces acting on the bracelet are intercepted by the hinge of the cover, so that it can become deformed and damaged, leading to rapid wear.
A solution making it possible to remove the bracelet without any risk of undoing the fixing of the free bracelet strand is described in European patent 607,726 with a stud located on a base plate detachably connected to a first strip, permitting the fixing of the free bracelet strand. A cover is mounted on said first strip and articulated with respect to said strip and with respect to said base plate, permitting a pivoting towards the base plate and a notching with said base plate. Another bracelet strand is permanently fixed to a second strip of the clasp. The locking of the two strips is obtained by engaging two openings of two strips on two rods mounted on a third clasp strip.
This construction suffers from the disadvantage that the torque and tensile forces acting on the bracelet are intercepted by the hinge of the cover and the base plate, so as to be able to deform and damage it, leading to rapid wear.
Therefore the object of the present invention is to provide a solution to these problems by creating a fastener having a clasp and w
REFERENCES:
patent: 1741421 (1929-12-01), Kraemer
patent: 1997723 (1935-04-01), Franklin, Jr.
patent: 2532840 (1950-12-01), Gaun
patent: 4382318 (1983-05-01), Takimoto
Ferrario Luigi
Gay Jacques Hubert
Gay Freres Vente et Exportation S.A.
Sakran Victor N.
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