Electric appliance timer with automatic turn off

In a timer assembly for control of an electrical device, said timer assembly including a motor, a clockwork gear train rotated by said motor, manually-operable means for determining a set-time, and an electrical switch controlling said device, the improvement comprising:

• a rotatable cam,
• means responsive to the rotation of said cam for actuating and deactuating said switch,
• means connected to said gear train for rotating said cam in a first direction when said set-time is reached to actuate said switch,
• a gear connected to said cam to further rotate said cam in said first direction for a predetermined time interval after said set-time, and
• means for engaging said gear with said gear train upon actuation of said switch for said predetermined time interval after said set-time.

A timer assembly for control of an electrical device, said timer assembly comprising

• a motor,
• a clockwork gear train rotated by said motor, manually-operable means for determining a set-time, an electrical switch controlling said device, a rotatable cam,
• means responsive to the rotation of said cam for actuating and deactuating said switch,
• means connected to said gear train for rotating said cam in a first direction when said set-time is reached to actuate said switch,
• a gear connected to said cam to further rotate said cam in said first direction for a predetermined time interval after said set-time, and
• means for engaging said gear with said gear train upon actuation of said switch for said predetermined time interval after said set-time.

A timer assembly for automatic or manual actuation of a switch, said timer assembly comprising,

• a motor,
• a timing gear driven by said motor,
• a manually-rotatable setting gear co-axially disposed and axially moveable with respect to said timing gear,
• means for axially shifting said timing and setting gears with respect to one another at a time selectable by rotating said setting gear,
• an electric switch having a depressable button to open or close said switch,
• an actuator longitudinally moveable and having a plunger positionable to depress said switch button,
• means biasing said actuator away from said switch button,
• a rotatable selector having an automatic latching arm and a sector gear, said selector having cam means cooperating with said actuator to move said actuator longitudinally toward said switch button upon rotation of said selector either in one rotational direction or in an opposite rotational direction,
• first detent means on one of said timing or setting gears cooperating with said automatic latching arm to latch said selector after it has turned in said one rotational direction and to release said automatic latching arm when said timing and setting gears are shifted axially with respect to one another,
• second detent means on the selector cooperating with said actuator to latch said selector after it has turned in said opposite rotational direction, and,
• a friction gear assembly cooperating with said sector gear for automatically rotating said selector in said opposite rotational direction when said automatic latching arm is released.