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US 4,536,626 AGranted
Timer drive mechanism
AssigneeThe Singer Company
InventorGuy A. Wojtanek
Life of this patent
Estimating the term…
Abstract
A drive mechanism for a timer includes a drive pawl having a pin which is trapped between two camming surfaces of a continuously driven drive cam. The drive pawl is slidably mounted in the timer frame so that it is linearly reciprocated when the drive cam is rotated. A spring biases the drive pawl against the ratchet track.
Claims9
A mechanism for driving a switching device in a timer or the like in a step-by-step manner, comprising:
- a ratchet track on said switching device;
- a motor;
- a drive cam coupled to said motor for continuous rotation therewith, said drive cam having opposed first and second camming surfaces thereon;
- a drive pawl operatively associated with said ratchet track;
- a cam follower mounted on said drive pawl and trapped between said first and second camming surfaces;
- means for yieldably biasing said drive pawl against said ratchet track;
- and
- guide means for limiting the motion of said drive pawl to substantially linear reciprocation tangential to said ratchet track.
5 more elements
Dependencies are inferred from the claim text.