Variable resistor

Details Variable resistor Variable resistor

1974-05-31

1976-12-14

Albritton, C. L.

Electrical resistors

Mechanically variable

Movable contact electrically adjustable over length of...

338162, 338196, H01C 1030

Patent

active

039978648

ABSTRACT:
A variable resistor is disclosed which may readily attain or reproduce a preset value. A wiper arm or plate is carried by an outer shaft for rotation with a wiper in sliding contact with a resistor so that the resistance value may be continuously varied in a conventional manner. In order to detect the angular position of the outer shaft where a preset value is obtained, a click mechanism is incorporated. A click spring of the click mechanism is fixed to a switching plate carried by an inner shaft fitted into the outer shaft for rotation therewith or independently thereof in case of presetting, and a ball loosely carried at the free end of the click spring is adapted to engage with a recess formed at a predetermined position of a stationary click plate so that the inner shaft may be stopped at a predetermined angular position. To preset, one rotates the outer shaft to a desired resistance value, and then while holding the outer shaft stationary, he rotates only the inner shaft until it is stopped by the click mechanism. After presetting, a preset value is readily reproduced when one rotates both the outer and inner shafts until and they are stopped by the click mechaism. Furthermore, the variable resistor incorporates a switch so arranged that when, and only when the inner shaft is stopped by the click mechanism, the switch is closed to turn on an indicator lamp.

REFERENCES:
patent: 1997258 (1935-04-01), Krieger
patent: 2457920 (1949-01-01), Rider
patent: 2469924 (1949-05-01), Kunz, Jr.
patent: 2492286 (1949-12-01), Hermann
patent: 2650270 (1953-08-01), Mucher
patent: 3143098 (1964-08-01), Blackwell
patent: 3373393 (1968-03-01), Hauenstine et al.
patent: 3544749 (1970-12-01), De Angelo
patent: 3611245 (1971-10-01), Puerner
patent: 3697921 (1972-10-01), Urwin
patent: 3848219 (1974-12-01), Oka

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