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US 4,410,873 AGranted
Rotary variable resistor
AssigneeAlps Electric Co., Ltd.
InventorJunichi Kuratani
Life of this patent
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Abstract
A rotary variable resistor wherein a pair of levers are arranged in a case, a knife-shaped cam has its one end pivotally mounted on a projection of each lever, and the cam comes into engagement with a tooth portion of a toothed wheel in accordance with the operation of the lever so as to turn a slider holder. The moving stroke of the lever can be made small, and the slider holder can be turned every small angle.
Claims5
A rotary variable resistor comprising a case;
- two levers arranged on opposite sides of said case;
- two cams each having one end pivotally mounted on a respective one of said levers, said cams each being formed with an indent in a position close to the pivotal connection to the respective lever;
- two cam keepers formed in said case and adapted to engage a respective one of said indents;
- a slider holder carrying a toothed wheel rotatably arranged in a central part of said case;
- sliders mounted on said slider holder and adapted to engage arcuate resistors formed on an insulating base plate;
- said levers being vertically moved to cause the edge portions of the corresponding cam to pivot said toothed wheel and said slider holder and thus cause said sliders to slide on said arcuate resistors, whereby a resistance value of said variable resistor can be varied.
3 more elements
Dependencies are inferred from the claim text.