Buckles – buttons – clasps – etc. – Separable-fastener or required component thereof – Including member having distinct formations and mating...
Patent
1991-10-21
1993-01-05
Sakran, Victor N.
Buckles, buttons, clasps, etc.
Separable-fastener or required component thereof
Including member having distinct formations and mating...
24 71J, 24265WS, A44B 1100, A44B 2100
Patent
active
051759128
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to wristwatch straps and its object is to provide a fastener for such straps which has a simple, functional and versatile conformation as well as being convenient and easy to operate both during fastening of the watch on the user's wrist and during its removal, and when it is wished to remove the strap rapidly in order to replace it.
SUMMARY OF THE INVENTION
According to the invention, this object is achieved by means of a fastener for a wristwatch strap, characterised in that it comprises at least one arcuate catch element provided with guide means extending longitudinally of the strap and an end engagement member, and at least one slide element provided with a latch member complementary to the end engagement member of the catch element, the slide element being slidable along the guide means between an advanced position, in which the strap is shortest and in which the latch member engages the engagement member, and a retracted position, in which the strap is longest; means being provided for releasing the latch member from the engagement member when the- slide element is in the advanced position and for enabling the slide element to be released from the catch element in the retracted position to unfasten the strap.
The invention provides for various embodiments which may have two catch elements fitted to opposite sides of the watch case and which cooperate with two slide elements carried by the ends of the strap, or a single catch element provided on one side of the case and cooperating with a single slide element carried by the corresponding end of the strap, or even a single catch element and a single slide element fitted to a central region of the strap, that is, in a position remote from the case.
In the preferred embodiment of the invention, which has two slide elements fixed to the ends of the strap and which cooperate with two catch elements articulated to the watch case, each catch element comprises a base projecting from the end engagement member and provided with raised side walls with free guide edges bent inwardly of the base and each slide element has two side appendages engaged for sliding along the guide edges of the respective catch element.
According to this embodiment, the end engagement member is constituted by a transverse tab situated above the base and the latch member is constituted by a complementary recess formed in a resilient front appendage of the slide element which is resiliently deformable by means of a push member. Moreover, at its opposite end from the end engagement member, the base of the catch element has a projection for frictional interference with the back of the strap when the slide element is in the retracted position.
According to this embodiment, in practice, the two catch elements are articulated permanently to the watch case, that is, they need not be removed during the normal lengthening and shortening of the strap which is necessary for the watch to be fastened on the user's wrist and for it to be removed. In fact, for these operations, it suffices to release and move one or both of the slide elements. Any replacement of the strap can then be achieved by the user himself, without the need for any tools, by means of a pull on both of the slide elements, which have first been placed in the retracted positions, so as to overcome the frictional resistance of the projections provided on the two guide bases of the, catch elements.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in detail with reference to the appended drawings, provided purely by way of non-limiting example, in which:
FIG. 1 is a partially-sectioned, schematic, side-elevational view of a wristwatch with a strap provided with a fastener according to a first embodiment of the invention,
FIG. 2 is a schematic perspective view of part of the fastener,
FIG. 3 is a longitudinal section of the fastener of FIGS. 1 and 2 on an enlarged scale,
FIG. 4 shows a first variant of FIG. 1,
FIG. 5 shows a second variant of FIG. 1,
REFERENCES:
patent: 1764440 (1930-06-01), Gammell et al.
patent: 1786943 (1930-12-01), Gammell
patent: 1985835 (1934-12-01), Prestinari
patent: 1997723 (1935-04-01), Franklin, Jr.
patent: 1997836 (1935-04-01), Steinberg
patent: 2097055 (1937-10-01), Bender
patent: 2262623 (1941-11-01), Ritter
patent: 2282563 (1942-05-01), Corbi et al.
patent: 2461309 (1949-02-01), Cedar
Chevalley Gianandrea
De Carlo Enzo
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