Molded plastic control lock knob with push and/or pull feature

Details Molded plastic control lock knob with push and/or pull feature Molded plastic control lock knob with push and/or pull feature

1980-09-03

1983-02-15

Herrmann, Allan D.

Machine element or mechanism

Control lever and linkage systems

Elements

74553, 188 67, 403352, 403374, G05G 516, G05G 108

Patent

active

043734057

ABSTRACT:
A device is disclosed for use with adjustable rotary controls such as potentiometers that have a push and/or pull feature to provide a means for locking the control knob and to provide varying amounts of drag force to aid in fine adjustments. A locking shoe assembly having integral locking shoes with cam surfaces is attached to the control panel with the rotary control shaft extending through its center. A locking knob with internal cams fits over the locking shoe assembly and is held in place with an annular retention ring. A control knob with an integral land surface is attached to the rotary shaft and extends into the locking shoe assembly. Rotation of the locking knob engages the various cam surfaces thus binding the land surface and the control knob.

REFERENCES:
patent: 808992 (1906-01-01), Lawson
patent: 1568295 (1926-01-01), Schleicher
patent: 2312590 (1943-03-01), Reynolds
patent: 2542434 (1951-02-01), Russell
patent: 2546157 (1951-03-01), Hume
patent: 2636068 (1953-04-01), Perkins
patent: 2871044 (1959-01-01), Peterson et al.
patent: 3292956 (1966-12-01), Schiansky
patent: 3419293 (1968-12-01), Conrad
patent: 3515418 (1970-06-01), Nielsen, Jr.
patent: 3773371 (1973-11-01), Carlsson
patent: 3916721 (1975-11-01), Egger
patent: 3924957 (1975-12-01), Camosso
patent: 4154125 (1979-05-01), Frank
patent: 4154545 (1979-05-01), Pinto et al.

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