Automatic restoral mechanism for a pushbutton key telephone...

Details Automatic restoral mechanism for a pushbutton key telephone... Automatic restoral mechanism for a pushbutton key telephone...

H - Electricity

04

M

379/107

H04M 1/02 (2006.01) H04M 1/08 (2006.01)

Patent

CA 1143496

TITLE AUTOMATIC RESTORAL MECHANISM FOR A PUSHBUTTON KEY TELEPHONE INSTRUMENT ABSTRACT OF THE INVENTION A mechanism for automatically restoring an operated and depressed pushbutton line key in a multi-line key telephone instrument. When the tele- phone instruments handset is returned to the instru- ments 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.

350220

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