Rotary operation type variable resistor

Details Rotary operation type variable resistor Rotary operation type variable resistor

1996-01-16

1999-12-21

Gellner, Michael L.

Electrical resistors

Mechanically variable

Movable contact electrically adjustable over length of...

338163, 338170, H01C 1032

Patent

active

060054735

ABSTRACT:
A rotary operation type variable resistor including a resistor base and a holder, on which a sliding-element supporting member is rotatably retained, are placed in a case provided with only one opening for component insertion. An operating lever is fixedly connected to a shaft portion of the sliding-element supporting member using a speed nut. A resistor pattern is formed by printing on the resistor base in a positional relationship determined by positioning reference portions formed on the resistor base. Positioning reference portions are also formed on the holder, and positioning portions are formed in the case. A resilient-contact member for bringing the positioning reference portions of each of the resistor base and the holder into contact with the positioning portions of the case is also provided on the case. A lower bearing made of stainless steel and formed by pressing so as to have a cylindrical portion and a flange formed at one end of the cylindrical portion is integrally combined with the holder by insert molding, while an upper bearing is press-fitted to the holder, thereby forming a bearing unit for receiving the shaft portion of the sliding-element supporting member.

REFERENCES:
patent: 3629780 (1971-12-01), Burcham et al.
patent: 3683308 (1972-08-01), Hamill
patent: 3905097 (1975-09-01), Beetle
patent: 3970986 (1976-07-01), Seyler et al.
patent: 4523175 (1985-06-01), Sakurai
patent: 4701740 (1987-10-01), Reuss et al.
patent: 4894638 (1990-01-01), Flierl et al.
patent: 5039975 (1991-08-01), Ishihara
patent: 5053742 (1991-10-01), Masuda
patent: 5144277 (1992-09-01), Ishihara et al.

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