Title: Manufacturing method of gear wheel of clocks and watches and gearwheel made by said method
Application Number: 99126018 Application Date: 1999.10.14
Publication Number: 1253315 Publication Date: 2000.05.17
Approval Pub. Date: 2003.10.01 Granted Pub. Date: 2003.10.01
International Classifi-cation: B21D53/28;B23P15/14;G04B13/02;G04D3/00
Applicant(s) Name: ETA Sa Fabriques D Address:
Inventor(s) Name: M. Betteliney
Attorney & Agent: yang songling
Abstract:
    A clockwork wheel (1) including a plate (3) provided with a first series of peripheral teeth (4) and a second series of teeth (5) arranged at right angles to the plate is manufactured in a strip of steel suitable for stamping and by means of a progressive forging die. In order to form the second series of teeth (5), a die perforated with a plurality of openings arranged in a circle is applied onto one face of the strip, and the flat face of a cylinder is pressed onto the other face of the strip to cause the steel to flow inside the openings of the die. The clockwork wheel is used as a setting wheel in a time or date setting mechanism.
Time: 12