Patent
1979-04-30
1981-01-06
Brigance, Gerald L.
179164, 179 1HS, H04M 108
Patent
active
042438470
ABSTRACT:
A mechanism for automatically restoring an operated and depressed pushbutton line key in a multi-line key telephone instrument. When the telephone instruments handset is returned to the instruments cradle, the cradle rotates a cradle shaft which in turn rotates a hookswitch and a restoral actuator mounted to the shaft. The hookswitch actuator operates hookswitch contact springs placing the instrument in the "on-hook" condition and simultaneously the restoral actuator moves a button restoral arm which swings horizontally about a pivot. Restoral linkage mounted to the restoral arm transfers the arms' motion to an interlock lever which also pivots applying a mechanical force on the line key latch bar, unlatching the depressed pushbutton and restoring it to its original or non-operated position.
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patent: 2780677 (1957-02-01), Schaufuss
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patent: 4049925 (1977-09-01), Laing et al.
Black Robert J.
Brigance Gerald L.
GTE Automatic Electric Laboratories Incorporated
Miologos Anthony
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