Maintenance termination unit circuit structure

Claim 1

A circuit board housing for use in enclosing a circuit board, said housing being adapted to be slidably engaged into slot forming means on a supporting wall in which the effective width of a pair of opposed slots formed by said slot forming means vary beyond normal commercial tolerances, said housing comprising: an outer planar wall and a pair of opposed side walls communicating with said outer planar wall; said side walls each defining a free edge bordering an opening for insertion of a circuit board; each of said side walls having a laterally extending flange at said free edge for engaging said slot forming means; said last mentioned flanges each having an effective thickness corresponding to the width of an engaged slot, and outer edge surfaces spaced from each other a distance corresponding to the spacing of said slot forming members; a projection disposed on each of said outer edge surfaces of thickness corresponding to that of said last mentioned flanges, said flanges having an elongated opening extending through the plane thereof to form a resilient segment of material supporting said projections whereby to permit limited flexing of said projection within the plane of said flange; whereby upon engagement of said circuit board housing within said slot forming means, said projections may flex within the plane of a respective laterally extending flange to apply a resilient force against said slot forming means to assure frictional engagement therewith.