Electrical resistors – Mechanically variable – With switch
Patent
1976-08-04
1978-03-28
Albritton, C. L.
Electrical resistors
Mechanically variable
With switch
338164, 338184, 338172, 338198, 338199, H01C 1050
Patent
active
040817822
ABSTRACT:
A potentiometer and switch combination including a rotatable control cap positioned over a potentiometer body to form a housing. The cap is provided with an annular flange which abuts an annular shoulder on the body, either the flange or the shoulder being formed from stiffly flexible, resilient material. The body holds the cap in place by means of a post having a chevron at its upper end which mates with a recess in the cap. The cap is positioned to deform the stiffly flexible, resilient material into frictional sealing relation with its abutting member and thereby seal the interior of the housing. The sealing arrangement also introduces a torque which opposes rotation of the cap. The switch includes a conductive strip held by the body, one portion of the strip forming a first contact and another portion forming a spring detent. A cantilever spring blade which holds a second contact adjacent to and radially inward from the first contact urges the contacts together, while a nonconductive blocking member projects downwardly from the cap to separate the contacts when the switch is off. Rotating the cap moves the blocking member out from between the contacts, permitting them to close, and also causes the spring detent to snap against the blocking member and give the operator a positive switch feel.
The device is particularly suited for use in a hearing aid.
REFERENCES:
patent: 2451241 (1948-10-01), Rosentreter
Hildreth Bradrick Alan
Stephens Donald Harrison
Wiley George Richard
Albritton C. L.
Becker William G.
Bourns Inc.
Ware Paul H.
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