Spring winding gearing including a safety mechanism against raci

Details Spring winding gearing including a safety mechanism against raci Spring winding gearing including a safety mechanism against raci

1987-10-22

1989-09-19

Roskoski, Bernard

Horology: time measuring systems or devices

Mechanical time base

185 39, G04B 100

Patent

active

048688010

ABSTRACT:
The invention relates to a spring winding gearing for the drive assembly of a device with a drive shaft biased by a coil spring and a drive controlling device acting on the drive shaft via at least one intermediate transmission. A first toothed wheel is firmly attached to the drive shaft, a pivotable locking pawl is provided for the first toothed wheel, which locking pawl is held in the disengaged position by a movable support member, and a second toothed wheel is arranged at the support member, which second toothed wheel cooperates with the first toothed wheel and, upon increased rotational speed of the first toothed which second toothed wheel cooperates with the first toothed wheel for releasing the locking pawl. In this manner, racing of the drive shaft in case of a broken axle and the like is prevented, and in order to realize malfunction in due time, the safety mechanism against racing can be checked manually.

REFERENCES:
patent: 3293922 (1966-12-01), Pittman, Jr.
patent: 4602700 (1986-07-01), Szabo
patent: 4676122 (1987-06-01), Szabo et al.

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