Rack for accommodating circuit boards

Claim 1

A rack for accommodating circuit boards, comprising two metal end plates, opposed pairs of upper and lower extruded metal tie bars fixed at their opposite ends to the end plates, and guide rails molded from plastics material which extend between the upper tie bars and between the lower tie bars in directions parallel to the end plates in opposed pairs, the guide rails being attached at the ends thereof to the tie bars and having grooves in the opposing faces thereof for accommodating the upper and lower edges of circuit boards slid endwise into the rack, each of said rear tie bars having a forwardly facing vertical face formed with regularly pitched slots for accommodating the rear ends of said guide rails, each of said front tie bars having a horizontal face formed with slots regularly pitched at the same pitch as the slots in the rear tie bars for accommodating the front ends of said guide rails, each guide rail having at the rear end thereof a projection capable of insertion into one of said slots in a rear tie bar to locate said guide rail vertically and capable of limited horizontal movement with respect to said tie bar, said guide rail also having at the front end thereof a deformable projection for entry into a slot in the opposed front tie bar, each front tie bar having adjacent each slot therein a portion operative to deform said deformable projection as it enters said slot and thereafter to locate said guide rail horizontally.