US2282122A

US2282122A - Shock absorber for the balance staff of watches

Info

Publication number: US2282122A
Application number: US360181A
Authority: US
Inventors: Erismann Gerard
Original assignee: Individual
Current assignee: Individual
Priority date: 1939-10-30
Filing date: 1940-10-07
Publication date: 1942-05-05
Anticipated expiration: 1959-05-05

Description

May 5, 1942.

G. ERlsMANN 2,282,122

SHOCK ABSORBER FOR THE BALANCE STAFF` 0F WATCHES Filed Oct. 7, 1940 10 11 7 i2 9 f6 ZMS/p;

f mamy/272 Patented May 5, 1942 1 SHOCK ABSORBER FOR THE BALANCE STAFF OF WATCHES Grard Erismann, Neuveville, ,Switzerland Application October 7, 1940, Serial No. v360,181 InYSwitzerland October 30, 1939 .5 Claims.

a whole `with said setting and comprising a spiral spring and another ring in which said jewel-is setand which forms the inner end of said spiral spring.

A further object is to make the setting in one piece with said ring or to force the latter into said setting.

Still another object is to provide a second setting placed on the rst setting and made in one piece with a second elastic arrangement being supported on the cap-jewel. In a special embodiment this second elastic arrangement can f be made in one piece with the cover plate.

Other objects and features will be apparent as the following description proceeds, reference being had to the accompanying drawing in which Fig. l is a vertical section through the balance staff of an embodiment;

Fig. 2 is a top view with cover plate, index and cap-jewel removed,

Figs. 3 and 4 are vertical sections through the balance staff of other embodiments.

In the embodiment shown in Figs. 1 and 2, I represents the iiat part of the balance-cock to which a cover plate 2 is screwed; the index 3 tting, as usual, the circumference of this cover plate. An aperture is provided on the cover plate in which, by insertion of a. collet 4 and exible tongues 5 forming the object of a former invention, a cap-jewel 6 is held, serving the purpose of absorbing the axial component of the A shocks to which the balance staff is exposed.

The arrangement according to the present invention is intended to absorb the radial cornponent of these shocks. It comprises a setting 8, an elastic member consisting of a ring 9 and of a spiral spring I0 ending in a ring H, and a perforated jewel I2. The setting 8 is inserted into a circular recess of the part I and is supported on the bottom of said recess. The perforated jewel I2 is set in the ring Il, which is in the center of the elastic member. In this (Cl. .5S-140) embodiment the two portions of the elastic member, zviz.: the spiral spring I0 and the ring 9 are made in one piece with the setting 8. The ring A9 could, however, just as well be forced into the setting 8 or xed to the setting in any other sui-table way.

I'Itis understood that the elastic member may .be-diiferentffrom that above described and illustrated. flteould, for instance, -have any form yoft-he larrangements shown -in the Swiss Patents l;S6,317,-92,767, 192,768. f .Int'iiig 13van vexample is illustrated, which is distinguished by the feature that the setting of fthe elastic memberpr arrangement carries aseo- 15 rond setting. A .secondlelastici member, being supported on the capjeweLis Lmade in :one piece Lwi'th this second'fsetting 'In this'Fig. 3, II again represents the fiat part of the balance cock, into a recess of which the setting 8 made in one piece with the spiral spring I0, is inserted` The center of this spiral spring is formed as a ring into which a perforated jewel I2 is set, which, in its turn, serves as a bearing for the balance staff 1. A second setting I3 is fitted to the setting 8 with the help of a rim I4. The center part of this second setting I3 is formed by elastic lamellae constituting a spring, the cap-jewel being located under these lamellae. The number of these lamellae I5, disposed along radii of the setting, varies from three to six` These lamellae absorb the axial shocks to which the capjewel is exposed. Together with the setting carrying them, they constitute a second elastic member or arrangement completing the one formed by the spiral spring I0 and the perforated jewel I2. The tting of the setting I3 to the setting 8 being rather close, the two devices form a handy whole which, as a single piece, can, accurately centered, be inserted into the corresponding recess of the part I. The whole is kept in place by the cover plate 2. The cap-jewel 6, on its circumference, is so thick that it does not cant or fall out of the setting I3 whatever the shock, to which the timepiece in the direction of the 7 shaft axis and away from the bearing is subjected, may be.

In the embodiment illustrated in Fig. 4 the same parts are seen as in the preceding one. 'Ihe first elastic member or arrangement absorbing the radial shocks is, also in this embodiment, formed by the spiral spring IIJ made in one piece with the setting 8. 'Ihe second elastic arrangement is formed by the lamellae 2l made, in this case, in one piece with the cover plate 20 forced into the setting 8 of the rst elastic piece in the direction of the shaft axis and away from the bearing is subjected, may be. WhatI claim is: l. In a watch, a balance staff, a jewel adapted to hold said balance stai pivotally, a balance cock comprising a at part, a hollow on said t flat part, a setting lodged in said hollow, an elastic arrangement forming a whole 4With said setting, a ring disposed in the center of said elastic arrangement forming a Whole with said jewel, a cap-jewel, asecond setting placed on said setting, a second elastic arrangement made in one piece with said second setting and adapted to press against said cap jewel.

2. In a watch, a balance stai, a jewel adapted to hold said balance staff pivotally, a balance cock comprising a at part, a hollow in said at part, a setting lodged in said hollow, an elastic arrangement forming a whole with said setting, a ring disposed in the center of saidelastic arrangement andadapted to receive said jewel, a cap-jewel,v a second setting fitted into said setting, a second elastic arrangement made in one piece with said second setting and adapted to press against said cap jewel. 1' I Y v 3. In a watch,l a balance staff,y a jewel adapted 4. In a watch, a balance stai, a jewel adapted to hold said balance staff pivotally, a balance cock comprising a flat part, a hollow in said flat part, a setting lodged Iin said hollow, an elastic arrangement forming a whole with said setting, a ring disposedin the center of said elastic arrangement and adapted to receive said jewel,

a cap-jewel, a cover plate fitting said setting, a second elastic arrangement made in one piece with said cover plate and adapted to press against said cap-jewel, said cover plate and said setting being connected with one another in such a way as lto form a whole centered in said hollow by means of the circumference of said setting` 5. In a watch, a balance staff, a jewel adapted to hold said balance staff pivotally, a balance cock comprising a iiat part, a hollow on said flat part, an elastic member, a setting surrounding said elastic member and integral with and of greater thickness than said elastic member and extending beyond both front faces of said elastic member and lodged in said hollow, and a ring disposed in the center of and integral with said elastic member and adapted to receive said jewel.

GRARD ERISMANN.