Abstract: A printed circuit board wedge assembly having a center section riveted to a printed circuit board. The center section is designed to allow the wedge operating shaft running longitudinally through the wedge assembly to be positioned into the center section opening with no obstructions. A biasing spring is placed through a slot and moved in place along grooves cut into the center section. The spring captivates the operating shaft assembly to the center section and enables all the wedge sections to be aligned.

Abstract: A retainer apparatus for conveniently installing and retaining a printed circuit board within a housing. The apparatus includes a lever mounted on the board and a cooperating gear assembly carried by the board and the housing for use in manually installing the board in, or removing the board from, the housing. A conventional locking wedge assembly can be manually operated by the same lever, to retain the printed circuit board within the housing after its installation.

Abstract: A locking wedge apparatus for fastening a printed circuit board within an elongated slot in a rack. The apparatus includes an elongated center wedge having sloped surfaces at its opposite ends and two end wedges abutting against the center wedge's slopes surfaces. A screw extends lengthwide through a channel in the center wedge to connect together the two end wedges. Rotating the screw in a forward direction draws the two end wedges toward each other, causing them to slide on the center wedge's sloped surfaces and thereby deflect transversely to lock the printed circuit board in place. A clutch mechanism limits the maximum torque that can be applied to the screw, to provide predetermined tightening of the apparatus and thereby prevent physical or functional damage to the printed circuit board. A biasing spring biases the wedges into longitudinal alignment, to facilitate initial installation of the printed circuit board and wedge assembly into the slot.