Straight line telephone dialer

Details Straight line telephone dialer Straight line telephone dialer

1977-07-25

1980-04-22

Brigance, Gerald

H04M 131

Patent

active

041996666

ABSTRACT:
A straight line dialing mechanism for a telephone employs a movable plate having finger tip accommodating apertures. Initial movement of the plate to an index position causes a spline on the plate to close a switch that short circuits the telephone receiver and winds a spring that supplies the force for return of the plate. Return movement of the plate is controlled by a speed governor. The plate carries a series of nodes which actuate the leaf of a normlly closed switch to momentarily open the switch with the passage of each node in the return of the plate to its initial position. The leaf carries a ratchet head that enables the nodes to pass in the opposite direction without appreciable flexure of the leaf.

REFERENCES:
patent: D145780 (1946-10-01), Deakin
patent: 1038419 (1912-09-01), Nevin
patent: 1040389 (1912-10-01), Nevin
patent: 1257180 (1918-02-01), Betulander
patent: 2236997 (1941-04-01), Feinberg
patent: 2502440 (1950-04-01), Deakin
patent: 2503542 (1950-04-01), Brander
patent: 2635230 (1953-04-01), Madden
patent: 2888521 (1959-05-01), Doring
patent: 3072749 (1963-01-01), Haussermann

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