Device for fastening a rotationally symmetrical part, in particu

Details Device for fastening a rotationally symmetrical part, in particu Device for fastening a rotationally symmetrical part, in particu

1996-05-15

1997-08-05

Miska, Vit W.

Horology: time measuring systems or devices

Cases

With bezel or crystal details

G04B 3700

Patent

active

056549415

ABSTRACT:
A rotatable ring is fastened to a watchcase to an encircling, rotationally symmetrical shoulder extending in axial direction with respect to the watchcase. For this purpose an encircling groove is provided on the shoulder along an outer generated surface, from which at least two slots extend which are disposed distributed over the circumference of the groove essentially in axial direction to a face protruding toward the watchcase. Disposed on the rotatable ring are radially directed peg-shaped projections corresponding to the number of slots. To fasten the rotatable ring, the projections are inserted into the groove through the slots, which are preferably inclined with respect to a longitudinal axis of the watch. The projections can then slide along the groove. First and second engagement means, in the example embodiment shown a sawtooth-shaped toothing and a leaf spring with bent up flexible tongues, have the effect that the rotatable ring can be rotated only in one direction, that direction corresponding to the inclined position of the slots. To detach the rotatable ring, the rotatable ring is turned in the blocked direction with increased force.

REFERENCES:
patent: 4815053 (1989-03-01), Dal Busco
patent: 5122997 (1992-06-01), Schneider et al.
patent: 5541895 (1996-07-01), Nussbaum

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