Robert Boschgmbh

U.S. Philips Corporation

Jurgen Montag

Manfred Muller

Kurt Eisemann

Albert Eggert

Peter Wiener

The housing is essentially spherically shaped, formed with a flattened end wall (14), through which a sound receiving opening (42) extends in axial direction, located eccentrically with respect to the spherical housing. A volume control button (50) covers the sound receiving opening, the volume control button being maintained by a small distance (h) spaced from the spherical end wall to permit entry of sound to the sound receiving opening, while preventing masking of the sound receiving opening by the finger of a user, and free entry of contamination thereto. Preferably, the button is connected to the volume control element by an inwardly extending collar (52) which snaps over an adjustment rim (35) on a volume control positioned axially centrally on a printed circuit board (31) secured within the housing and passing through a central opening (47) formed therein. The flat end wall (14) can be formed with additional openings to permit access to adjustment screwdriver heads (36) of trimmer resistors, the additional openings likewise being masked by the volume control button for protection and to prevent contamination.

Miniature hearing aid

In a record player an overload coupling is arranged between a command disk and a pick-up arm controlled by the disk. The coupling comprises two coupling members which are pivotable relative to each other out of a neutral position about an axis, which members each comprise a guide which is concentrically curved around the axis. Viewed parallel to the axis, the guides coincide in the neutral position. A continuous helical spring, whose ends bear against end portions of the guides in the neutral position, is slid over the guides.

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Berlin, Germany

Jurgen Montag