Back to results
US 4,001,529 AGranted
Percentage timer
AssigneeThe Singer Company
InventorJoseph J. Mahon
Life of this patent
Estimating the term…
Abstract
The follower tip of the switch operating bell-crank lever can ride on the large diameter of the axially movable, rotatably driven cam or on axial movement of the cam can drop onto the smaller diameter of the cam to close one switch and, upon further axial movement, the follower can move further in to a pseudo inner diameter to close a second switch. The lever acts to prevent return axial movement of the cam until the cam notch is aligned with the follower and the follower no longer interferes with axial movement.
Claims10
A timer including a motor driving a shaft,
- a disc cam mounted on and driven by said shaft and being axially movable relative to the shaft,
- means biasing the cam to a first position,
- a lever including a cam follower biased into engagement with the perimeter of the cam when the cam is in said first position,
- means for moving the cam axially on said shaft to a second position in which position the cam moves out from under said follower and the lever moves inwardly of the cam along a face of the cam and engagement of the follower with said face prevents return of the cam to said first position under influence of the cam biasing means,
- a switch actuated by said lever when the follower moves inwardly,
- and means for returning the follower to the perimeter of said cam and the cam to said first position.
3 more elements
A timer including a motor driving a shaft,
- a disc cam mounted on and driven by said shaft and being axially movable relative to the shaft,
- cam follower means biased into engagement with the disc cam,
- a switch actuated by the cam follower means,
- means for moving the disc cam axially from a first to a second position whereby the cam follower means is not controlled by the disc cam and moves inwardly relative to the disc cam to actuate said switch and to act against the face of the cam disc to prevent movement of the cam disc to said first position,
- means for moving the disc cam axially from said second to said first position whereby the cam follower means is restored to control by the disc cam.
2 more elements
Dependencies are inferred from the claim text.