Control switch and potentiometer for hearing aids and the like

Details Control switch and potentiometer for hearing aids and the like Control switch and potentiometer for hearing aids and the like

1987-08-28

1989-02-07

Albritton, C. L.

Electrical resistors

Mechanically variable

With switch actuated by resistor actuator

338172, 338200, H01C 1050

Patent

active

048034584

ABSTRACT:
A control switch and potentiometer assembly for use in an in-the-canal type hearing air comprising a miniature single pole, single or double throw, push-pull control switch and rotary potentiometer. The components of the control switch and potentiometer are mounted within a durable thermoplastic resin housing which is anchored within the hearing aid. A single control knob for actuation of the control switch and potentiometer is raised and shaped to permit gripping between the fingertips of the user for removing the hearing aid from the ear canal.
The switch contacts and switch wiper are designed such that the process of pulling on the potentiometer control knob to remove the hearing aid will extend the control switch, thereby disengaging a normally closed switch contact and opening a battery powered circuit so as to turn the hearing aid off. A contact leg portion of a switch wiper has a projecting corner which slidingly engages a ramp section on one of the switch contacts, thereby providing an adjustable spring force which resists moving the potentiometer control knob between the extended and retracted positions.

REFERENCES:
patent: 3840838 (1974-10-01), Ja et al.

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