Electrical resistors – Mechanically variable – With switch actuated by resistor actuator
Patent
1977-07-14
1978-09-26
Albritton, C. L.
Electrical resistors
Mechanically variable
With switch actuated by resistor actuator
338164, 338172, 338184, 338199, 338200, H01C 1050
Patent
active
041174445
ABSTRACT:
A potentiometer and switch combination suitable for use as a hearing aid volume control. A control cap positioned over the potentiometer body is provided with an integral cam which performs the function of switch actuation. Positive seal is provided by an O-ring formed from a flexible, resilient material. The body of the potentiometer holds the control cap in place by means of heat stakes over a lip on the housing and a post having a chevron at its upper end which mates with a recess in the control cap. The cap is positioned by heat staking to press the stiffly flexible, resilient material of the O-ring into frictional sealing relation with an abutting member and thereby seal the interior of the potentiometer housing. The sealing arrangement also introduces a torque which opposes the rotation of the control cap, thus providing positional stability and positive operating feel. The switch includes conductive strips held by the body, one strip forming a first contact surface and another strip forming a spring detent and a second contact surface. Rotating the cap moves the cam so as to actuate the switch, and also causes the spring detent to snap so as to give the operator a positive switching feel.
REFERENCES:
patent: 2857496 (1958-10-01), Louis
patent: 2909749 (1959-10-01), Barden et al.
patent: 3629780 (1971-12-01), Burcham
patent: 3760324 (1973-09-01), Baldwin et al.
Hildreth Bradrick Alan
Stephens Donald Harrison
Albritton C. L.
Becker William G.
Bourns Inc.
Ware Paul H.
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