Latching actuator

Details Latching actuator Latching actuator

1983-12-01

1985-09-24

Sewell, Paul T.

Typewriting machines

Having fluid-pressure power drive

For type-face selection or choice

92 24, 400473, B41J 2322, F15B 1526

Patent

active

045430004

ABSTRACT:
A keyboard actuator for actuating the keys of a keyboard-operated apparatus including a plurality of fluid latching actuators supported to controllably and selectively actuate a key. In the preferred embodiment, each fluid actuator includes a latch and a piston. In response to fluid pressure, the latch releases the piston and the piston may be driven to actuate a key of the keyboard-operated apparatus. No return spring is used to cause a piston rod to rise to a position where it can be latched. The upward action of normally operative key effects the return of the piston rod to achieve latching.

REFERENCES:
patent: 859843 (1907-07-01), Rogers
patent: 2908251 (1959-10-01), Gratzmuller
patent: 3398651 (1968-08-01), Folmer
patent: 4441833 (1984-10-01), Hasenbalg

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