Abstract: A retainer for retaining an electronic module, such as a printed circuit board, in the slot of a casing. Oppositely oriented wedge-shaped elements are slidingly received on a rail in a manner which prevents rotation of the wedge-shaped elements about the rail. A pivotable lever having a cam surface is provided such that rotation of the lever actuates the retainer by compressing the wedge-shaped elements. In one embodiment, the lever is provided with a projection which engages the casing to extract the module when the lever is pivoted to release the retainer.

Abstract: A guide device is disclosed which assists in the positioning of cards in a card cage by adding to the front of a channel retaining a card edge a V-shaped entrance formed by complimentarily shaped guide members. The guide members each include a peg which is inserted through an associated hole in front of the channel into an associated aperture in a base member. The peg and associated base member aperture are complimentarily sized to permit the peg to be retained by the base member. The guide members are attached to the base member via flexible ribbons.