CH430593A - Fixed bearing for timepiece - Google Patents

Description

Fixed bearing for a timepiece The principal patent relates to a fixed bearing for a timepiece, comprising a support in which is fixed a bearing and housed a counter-pivot piece capable of being turned on it. same, characterized by the fact that the support has two superimposed circular recesses in each of which rotates a circular bearing of the counter-pivot piece, one of these bearings, at least, being eccentric with respect to the corresponding wear of the plate support f#on that a rotation of said pike causes the first wedging of said range in its recess.

0n has already proposed, moreover, certain counter-pivot plate devices in which the stone is mounted in a ring provided with several eccentric bearing surfaces cooperating with recesses in the plate.

These recesses have the form of frustoconical skirts with a non-circular director, while the edges of the bearing surfaces have a sharp edge by which the ring is wedged, by rotation, in the recess.

A disadvantage of this arrangement resides in the fact that this sharp edge always cuts slightly into the skirt of the hollow.

In addition, the contact surface between this skirt and the seat being reduced practically to a line, the progressive tightening of the ring is reduced.

Other proposed devices provide for a split ring having at least on a part of its height a slightly conical oval periphery, the ring being able to be introduced into a slightly conical oval recess made in the part of the movement intended to receive the stone, which is enclosed by said ring when the large diameter of the oval part thereof corresponds with the small diameter of said hollow.

A disadvantage of this arrangement resides in the existence of an elliptical cross-section surface which is always more difficult to manufacture than the circular cross-section pikes.

The present invention, the realization of which differs notably from that of the devices previously enumerated, relates to a fixed bearing for watchmaking, according to the claim of the main patent, bearing characterized by the fact that two recesses of the Support are eccentric by one another. relative to each other and that the two bearing surfaces of the counter-pivot piece 1e are also between them so that, in a certain position of the counter-pivot pike, each bearing bears in its respective recess.

The accompanying drawing shows, by way of example, two embodiments of the present invention.

fig. 1 is a plan view of the first embodiment and FIG. 2 a section through I1-11 of FIG. 1. Fig. 3 is a plan view of the second form of execution, and fig. 4 a cowpe according to IV-IV @ of fig. 3.

The form of execution represented by FIGS. 1 and 2 comprises a bearing support 1 intended to be fixed in a plate or in a bridge.

The pierced stone 2 is driven in the axial position, in this support. Above this stone, the support presents a recess 3 offset with respect to Faxe X-X of the Support, its axis Passing through A. A second recess 16, whose Faxe merges with Faxe X-X, is located above the Premiere. The counter-pivot 4 is driven into a hole in the kitten 12, its axis spassed by B. This kitten presents two litters. One 12a, whose Faxe passes through A, is located in the creu.sure I6, of axis X-X of the Support, and the other 12b is located in the hollow 3 and its axis passes through B. The chato, n 12 is constituted by a crown extending higher than the counter-pivot 4 and has, on its upper face, two diametrically opposed notches 12e.

The installation is carried out by placing the first counter-pivot 4 and its kitten 12 in the first bearing 1, for example in a position offset by 180 from that represented in FIG. 2,

after which, by means of a tool engaging in the notches 12e, an imparts to the piece 12 a rotational movement to bring it into the nmntree position, in FIG. 2, Jans position which the d@euxportees 12a and 12b take a # support in their corresponding recesses at diamitrally opposite points.

The embodiment of FIGS. 3 and 4 differs from the previous pf only in that the counter-#pivot 4 is mounted in a kitten 14 in the form of a cap and which, as in the 1st case preceding, extends higher than the counter-# swivel; at its upper part, the cap has a diame tral slot 14a for the introduction of a tool.

Claims (1)

CLAIM Fixed bearing for clock pike according to the claim of the main patent, bearing characterized by the first fact that the @two hollows of the Support are eccentric one by relative to one another and that the two bearing surfaces of the counter-pivot piece 1e are also between them so that, in a certain pasition of the counter-pivot piece, each bearing bears in its respective recess. SUB-CLAIM Bearing according to claim, the pike against pivot of which has a stone driven out of a bezel, characterized by the fact that the said bearing surfaces of the pike against pivot are located on the outer periphery of the bezel.