U.S. Philips Corporation

Wilhelmus J Rath

Karel G Koken

Cornelis Ouwerkerk

Cornelis M Beijersbergen Van Henegouwen

Johannes Martinus Van Der Donk

Pieter G Markus

Paul J Van Weele

Cornelius Ouwerkerk

Cornelis M Van Beijersbergen

A system for recording and/or reading signals on/from information carriers (4) accommodated in cassettes (2) composed of cassettes (2-3A) of a first type and cassettes (2-3B) of a second type, which two types of cassettes have substantially identical dimensions and shapes apart from local identifying distinctive features (22-3A, 26-3A; 22-3B, 26-3B) of a first type and of a second type respectively. Drive apparatus constructed to cooperate with a cassette of the system when inserted in a correct orientation. Drive apparatus of the first type, is constructed for cooperation with cassettes (2-3A) of the first type but not for cooperation with cassettes (2-3B) of the second type, and drive apparatus of a second type, is constructed for cooperation with cassettes (2 3B) of the second type but not for cooperation with cassettes (2 3A) of the first type. The drive apparatus further comprise a physical blocking mechanism (30; 52) of a first type and a second type respectively, which are constructed to cooperate with the distinctive features of the different cassette types wherein the drive apparatus of the first type accept cassettes of a first type but do not accept cassettes of the second type and the drive apparatus of the second type accept cassettes of the second type but do not accept cassettes of the first type, at least when that the cassettes are inserted in a correct orientation and in other cases block the cassettes.

System for selectively interfacing information carriers by physically

A cassette accommodates an information disc (1) which is rotatable inside a housing (2) and which can be read by means of a pick-up which is movable over the disc surface through an aperture (6) in a main wall (3). To enable the information disc to be exchanged rapidly and conveniently, the disc receiving space in the housing is readily accessible in that a shutter (16), which includes at least one of the transverse walls (4, 5, 17) of the housing, can be moved to an open position.

Cassette with removable disc

A slide switch having S-shaped movable contact springs which are movably connected to the contact slide, the free legs of the contact springs being provided with contact areas twisted through an angle of at least 1.degree., so that the switch is substantially crackle-free.

Slide switch having resilient movable contact arm twisted to provide

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Eindhoven, Netherlands

Wilhelmus J Rath