Timepiece with a constant-force device for acting on an...

Details Timepiece with a constant-force device for acting on an... Timepiece with a constant-force device for acting on an...

2007-11-13

2007-11-13

Miska, Vit W (Department: 2833)

Horology: time measuring systems or devices

Mechanical time base

Mainspring

C368S207000

Reexamination Certificate

active

11634654

ABSTRACT:
A timepiece, in particular a wristwatch, includes a constant-force device for acting on an oscillating system, the constant-force device including a switching unit and a tensioning module having a primary spring-energy store and a secondary spring-energy store. A seconds shaft bearing a seconds wheel and a cam plate is driven to rotate constantly by the secondary spring-energy store. The seconds wheel drives the oscillating system, and the cam plate acts on the switching unit for the periodic tensioning of the secondary spring-energy store by the primary spring-energy store.

REFERENCES:
patent: 240287 (1881-04-01), Vogel
patent: 1125617 (1915-01-01), Wilkinson
patent: 1237216 (1917-08-01), Oeth
patent: 1385351 (1921-07-01), Akerlund
patent: 1475629 (1923-11-01), Haynes
patent: 1611568 (1926-12-01), Standow
patent: 6863434 (2005-03-01), Mojon
patent: 6997602 (2006-02-01), Mojon et al.
patent: 120028 (1927-08-01), None
Examination Report dated Jan. 11, 2007 issued for the corresponding German Application No. 10 2005 058 321.0-31.

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