Enclosure for electrical circuit devices

Claim 1

AN ELECTRIC DEVICE ASSEMBLY, COMPRISING A CIRCUIT BOARD SUPPORTING THE ELECTRICAL COMPONENTS OF THE DEVICE AND THE CONNECTIONS BETWEEN SAID OCMPONENTS, AN ELECTRICAL SHIELDING ENCLOSURE OF GENERALLY RECTANGULAR TUBULAR CROSS SECTION HAVING TOP, BOTTOM AND SIDE WALLS, THE INTERIOR SURFACES OF THE SIDE WALLS OF THE ENCLOSURE BEING PROVIDED WITH SPACED PARALLEL RIBS DEFINING GROOVES RECEIVING THE LATERAL EDGE REGIONS OF SAID CIRCUIT BOARD, RESILIENT MEANS URGING SAID EDGE REGIONS AGAINST ESPECTIVE SIDES OF SAID GROOVES, IN FRICTIONAL ENGAGEMENT THEREWITH UNDER SUFFICIENT PRESSURE TO SUBSTANTIALLY PREVENT MOVEMENT OF SAID CIRCUIT BOARD RELATIVE TO SAID ENCLOSURE FURTHER MEANS ON THE INTERIOR SURFACES OF SAID ENCLOSURE DEFINING LONGITUDINAL GROOVES WITH AN INTERNAL CROSS SECTION SUBSTANTIALLY WIDER THAN THE LATERAL OPENINGS THEREOF, GENERALLY RECTANGULAR END PLATE CLOSURES AT THE ENDS OF SAID ENCLOSURE, AND MEANS REMOVABLY SECURING SAID END PLATES INCLUDING FASTENERS EXTENDING INTO AND COOPERATING WITH THE INTERIOR SURFACES OF SAID LAST MENTIONED GROOVES.