Bolt-like member and mounting therefor

Claim 1

IN COMBINATION: A BOLT HAVING A ROUNDED HEAD AND A NON-CIRCULAR SHANK PORTION ADJACENT THE BOLT HEAD, SAID HEAD IN ITS AXIAL DIRECTION BEING THINNER AT ITS PERIPHERY THAN AT ITS CENTER, AND A PLATE TO WHICH SAID BOLT IS TO BE ASSEMBLED WITH ITS SHANK PROJECTING FROM ONE SIDE AND ITS HEAD ABUTTING AND OVERLYING THE OPPOSITE SIDE, SAID PLATE HAVING A TONGUE LANCED THEREFROM TO PROVIDE A KEY-HOLE SLOT HAVING A LARGER PORTION TO FREELY PASS SAID BOLT HEAD AND A SMALLER PORTION WHOSE OPPOSED MARGINS ENGAGE WITH SAID NON-CIRCULAR SHANK PORTION TO HOLD SAID BOLT AGAINST ROTATION, SAID TONGUE HAVING ITS INTEGRAL CONNECTION WITH SAID PLATE AT SAID LARGER SLOT PORTION AND HAVING A PORTION OVERLYING AND DISPLACED, BOTH BEFORE AND AFTER ASSEMBLY OF SAID BOLT, AWAY FROM THAT PLATE SIDE WHICH SAID BOLT HEAD OVERLIES, THE DISPLACEMENT BEING A PREDETERMINED DISTANCE SUBSTANTIALLY EQUAL TO THE MAXIMUM THICKNESS OF SAID BOLT HEAD FOR CLOSELY CONFINING THE LATTER BETWEEN SAID TONGUE PORTION AND THE ADJOINING PLATE SIDE TO RESTRICT AXIAL MOVEMENT OF SAID BOLT, SAID BOLT BEING ASSEMBLED WITH SAID PLATE SOLELY FROM SAID PLATE ONE SIDE BY FIRST PASSING SAID HEAD THROUGH SAID LARGER SLOT PORTION AND WITH SAID BOLT TILTED RELATIVE TO THE PLANE OF SAID PLATE WHEREBY THE THIN PERIPHERAL HEAD PORTION FIRST ENTERS BETWEEN SAID TONGUE AND SAID PLATE,AND THEN MOVING SAID BOLT BODILY IN THE PLANE OF SAID PLATE AND INTO SAID SMALLER SLOT PORTION WHILE TILTING SAID BOLT TO POSITION ITS AXIS NORMAL TO THE PLANE OF SAID PLATE, SAID TONGUE PORTION HAVING AT LEAST ONE SECTION THEREOF DISPOSED NORMAL TO THE AXIS OF SAID BOLT AND ENGAGING THE BOTH HEAD AT A POINT AXIALLY INWARDLY OF SAID MAXIMUM THICKNESS THEREOF WHEREBY SAID SECTION AND SAID BOLT PROVIDE ABUTMENTS IN MUTUAL CONTACT TO RESTRAIN SAID BOLT FROM MOVEMENT OUT OF SAID SLOT.