Plessey Overseas Limited

Plessey Handel Und Investments A.g.

John A Carrier

The cathode ray tube assembly of a visual display unit is suspended over the static base in a cradle, the suspension pivots being as close as possible to the center of gravity of the moving section. Attached to the underside of the cradle is a bracket with forked arms. The forks engage with a spindle carrying a pair of friction pads and a helical compression spring. The spindle runs in a curved slot in a bracket attached to the static base. The friction pads are situated one on each side of the bracket and are maintained in intimate contact with it by the helical spring generating a friction force. Thus a force of sufficient magnitude applied to the moving part of the visual display unit will overcome the friction force and permit it to move, although normally the friction force will hold it in the required position.

Pivotal mounting system

A hinge assembly for a lid for a container consists of a pivot pin secured to the lid and which is rotatably mounted at its end in recesses formed inside the container. The pivot pin is retained in the recesses by an abutment member formed inside the container, the abutment member being deflectable to permit the pivot pin to be inserted into or withdrawn from the recesses. The abutment member is moulded as part of the container and is shaped so that no movable cores are required for the moulding tool resulting in a low cost arrangement.

Hinge assembly

An indexing mechanism for the volume control of a telephone bell comprises a slot and associated indexing notches which co-operate with a guide pin and an indexing pin respectively. Volume control is effected by forcing the indexing pin over one or more notches as desired. The volume setting is not easily altered by vibration of the instrument.

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Chilwell, United Kingdom

John A Carrier