Avionics line replaceable unit with frameless spring ramp circuit card retainer

Claim 1

An improved avionics cabinet of the type having: an end; a box top coupled to said end; a box bottom, parallel to said box top and coupled to said end; a front box side coupled to said end and perpendicular to said box top and said box bottom; a back box side parallel to said front box side and perpendicular to said box top and said box bottom and coupled to said end; said back box side having a plurality of back pins therein; the end and all of said box sides are configured to create a rectangular box; the box further having a removable cover which is parallel with said end; and, said box containing a plurality of electronic circuit cards disposed therein in a parallel fashion, each of said electronic circuit cards having a back card side, an opposing front card side, an insertion side, an end side, a top card side, and a bottom card side; where upon insertion of said electronic circuit cards in said box, said top card side and said box top are adjacent and said bottom card side and said box bottom are adjacent, said plurality of electronic circuit cards, each having a pin receiving connector on its end side, said pin receiving connector for mechanically and electrically coupling with said plurality of back pins; wherein the improvement comprises: a spring member disposed within said box and parallel with said electronic circuit cards; and, said spring member being actuated by said removable cover, so that, an installation of said cover on said box causes said spring member to contact said electronic circuit cards.