Abstract: An apparatus for holding recording discs is disclosed. The apparatus includes a first plate defining a first slot for receiving a recording disc and a second plate defining a second slot for also receiving the disc and for cooperating with the first slot to substantially support the disc on the disc's outer edge. In addition, the second slot cooperates with the first slot to laterally stabilize the disc. The apparatus further includes a housing for supporting the first and second plates in spaced relationship from each other.

Abstract: A displayboard comprises sheets with a plastics foam core formed in situ between them. Edging strips having internal channels in which the edges of the board lie are mechanically connected directly to the sheets either by tongues that project out of the sheets into recesses in the sides of the channels or by the pressure of the foam core when being formed forcing parts of the sheets into the recesses. The edging strips have external channels serving auxiliary functions, e.g. securing the displayboard to wall brackets, securing a hinge joining a second displayboard, securing a pencil tray and carrying a pelmet containing a spring-loaded clamp for clamping papers against the edging strip.

Abstract: A low profile switch or keypad has one or more touch buttons of circular or polygonal shape in plan formed integrally with and raised from a surrounding membrane of elastomeric material by a wall of resiliently deformable material of thickness and angle relative to the membrane so that the wall can flex under finger pressure on the or each button without deflecting the surrounding membrane. The membrane and at least the periphery of the button are relatively thick and the wall is relatively thin so that deformation during the keystroke is localized in the wall. The length of the wall is about equal to the keystroke and is relatively small compared to the width of the touch button. The junction between the wall and the membrane is located a distance greater than the keystroke above the lower surfaces of the membrane so that the wall passes overcenter during the keystroke resulting in a change in tactile sensation.

Abstract: A low profile switch or keypad has one or more touch pads (14) formed integrally with and raised from a surrounding membrane or key mat (15) of elastomeric material by a wall (30) of resiliently deformable material of thickness and angle relative to the mat (15) so that the wall (30) can flex under finger pressure on the or each pad (14) without deflecting the surrounding membrane. The underside of each pad (14) is formed with a convex contact pad (29) dimensioned in relation to the pad diameter and travel and the length of wall (30) so that the pad (29) makes surface to surface contact with conductors (12), (13) of an underlying circuit board (10). The mat (15) is held in tension to the board (10) fits. The keyboard uses only two interfitting parts and needs no bezel but provides a tactile response to key depression.