Expanded interval timer drive mechanism

Details Expanded interval timer drive mechanism Expanded interval timer drive mechanism

1984-07-02

1985-02-19

Miska, Vit W.

Horology: time measuring systems or devices

Time interval

Electrical or electromechanical

200 38B, G04F 800

Patent

active

045002126

ABSTRACT:
An expanded interval drive mechanism for a program timer includes a lift cam which periodically engages a pawl lifter to move the pawl lifter so as to lift the drive pawl away from the ratchet teeth. The ratchet teeth are at two levels. Where the ratchet teeth are at the lower level, operation of the pawl lifter prevents the drive pawl from engagement with the lower level ratchet teeth. However, the higher level ratchet teeth are always engaged by the drive pawl regardless of the operation of the pawl lifter. Therefore, an expanded interval is achieved in the region having the lower level ratchet teeth.

REFERENCES:
patent: 3141344 (1964-07-01), Nagy
patent: 3335235 (1967-08-01), Godwin
patent: 3373253 (1968-03-01), Davin
patent: 3717043 (1973-02-01), Cartier
patent: 4381432 (1983-04-01), Cushing

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