Metal working – Method of mechanical manufacture – Gear making
Patent
1999-10-14
2000-07-04
Echols, P. W.
Metal working
Method of mechanical manufacture
Gear making
2989334, 298963, 2989631, 72335, 74460, 74462, 368324, B21D 5328
Patent
active
060820012
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.
REFERENCES:
patent: 364107 (1887-05-01), Hart
patent: 4958430 (1990-09-01), Grieb et al.
patent: 5515607 (1996-05-01), Ikegami
patent: 5647125 (1997-07-01), Yokoyama
Patent Abstracts of Japan, vol. 10, No. 18 (M-503) Jul. 30, 1986 & JP 61 055472, Mar. 19, 1986.
Echols P. W.
Eta SA Fabriques d'Ebauches
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