International Computers Limited

Sidney H Martin

A cabinet for housing electronic equipment constructed entirely from plastics material. The cabinet comprises a base and panels all formed with integral parts which interlock to secure adjacent panels together thereby dispensing with the need for any structural framework. The cabinet is provided with a removable panel to allow access to its interior. Cam surfaces on the cabinet engage with complementary cam surfaces on the removable panel when the panel is slid into position to draw it into engagement with the cabinet. The inner surfaces of the panels have conductive coatings to provide screening against radio frequency interference and compressible electrically conductive gaskets are provided between the panels to form airtight seals and to maintain continuity of the screening.

Equipment cabinets having sliding closure

A connection arrangement (6) located on the side of a screened sleeve (2) housing electrical cables (1) for connecting the sleeve (2) to a unit of electrical or electronic equipment. The arrangement comprises a frame (17,18,19,20) of conductive material secured to flaps (13,14,15,16) cut in the wall of the screened sleeve (2) so as to form an electrical connection between the frame and the screen of the sleeve. The frame is received into a corresponding aperture (23) in a connection plate (22) on the unit of equipment allowing electrical cables housed in the sleeve to enter the unit through the frame and the connection plate aperture while maintaining the screening at the connection.

Connection arrangement for an electrically screened sleeve

A membrane switch assembly in which portions of a membrane 14 mounted on a base member 11 are belled-outwardly to provide cavities 15, which are positioned so as to overly the location at which conductors 21, 22 are to be connected. The formation of each belled out portion is such that each portion carries electrical contactor means 16, 20 and such that the portion has a circumscribing region 18 which on compression of the portion to cause switch operation allows the membrane 14 to collapse at this region before the membrane is fully compressed.

Electrical devices

An electrical sealing device consisting of a brush-like element comprising a plurality of flexible filaments (1) the majority of which are electrically conductive and are distributed substantially uniformly among the insulating filaments. The device can be used, for example, for electrically sealing around the edge of a door (6) of an equipment enclosure (5) so as to prevent electromagnetic interference from leaking into or out of the enclosure, or can be used for electrically sealing an aperture (9) through which wires (10) may pass.

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Mellor, United Kingdom

Sidney H Martin