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US 4,395,589 AGranted
Electro-acoustical structure
AssigneeEECO Incorporated
InventorDouglas J. Williams
Life of this patent
Estimating the term…
Abstract
An electro-acoustical structure for switching on and supplying sound to an all-acoustical headset upon the insertion of an acoustic-use plug. A piston-valve is depressed against a spring upon the insertion of the plug, opening acoustic ports, and also moving a bifurcated contact attached to the piston to close a circuit with coactive stationary contacts for energizing an electro-acoustic transducer.
Claims9
An electro-acoustical structure comprising;
- (a) a body (1) having at least one aperture (2) for receiving an acoustic-use plug (14),
- (b) a hollow piston valve (6) within said aperture,
- (c) a coiled spring (10) within said aperture and bearing outwardly against said piston valve with respect to said aperture,
- (d) a port (4) having an electro-acoustical transducer (3) within said body and acoustically communicating with said aperture,
- (e) a companion port (7) within said piston valve so related to said port (4) that when an acoustic-use plug is inserted into said aperture an acoustic channel exists from said transducer, through said port, through said companion port, and into the acoustic-use plug,
- (f) a bifurcated electrically conductive switch member (18) disposed within said piston valve, and
- (g) linear stationary contacts (19,20) to close an electrical circuit in coaction with said bifurcated switch member,
- when said piston valve is depressed within said aperture.
5 more elements
Dependencies are inferred from the claim text.