Expanded interval timer drive mechanism

Details Expanded interval timer drive mechanism Expanded interval timer drive mechanism

G - Physics

05

G

74/2

G05G 15/00 (2006.01) H01H 43/10 (2006.01)

Patent

CA 1229002

EXPANDED INTERVAL TIMER DRIVE MECHANISM ABSTRACT An expanded interval drive mechanism for a program timer includes two ratchet rings. One of the ratchet rings is fixed to the monoblock and at certain regions thereon it is missing teeth over a portion of its width. Thus, the first ratchet ring has regions of narrow teeth. The other ratchet ring is arranged for free relative rotational move- ment in a first direction with respect to the monoblock. All of the teeth of the two ratchet rings have substantial- ly the same major and minor diameters. However, the second ratchet ring is formed with at least one deep notch. In the region where the first ratchet ring has missing teeth, the toothless region is at substantially the same level as the notch. A single drive pawl extends over both ratchet rings and its driving surface is formed at a plurality of levels so that the drive pawl engages the first ratchet ring in the arc length corresponding to the toothless region only when the drive pawl engages the notch of the second ratchet ring. Otherwise, in this toothless region the drive pawl only advances the second ratchet ring, there- by providing an expanded interval.

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