Fastening device with pivotal locking means

Claim 1

A FASTENER FOR INSERTION WITHIN AN APERTURE PROVIDED IN A SUPPORT AND ENGAGEABLE WITH A REMOTE SURFACE THEREOF OPPOSITE A SIDE OF SAID SUPPORT AT WHICH SAID FASTENER IS INSERTED, SAID FASTENER COMPRISING A GENERALLY TUBULAR BODY HAVING A HEAD ENGAGEABLE WITH SAID SIDE OF SAID SUPPORT, A SHANK AND A LEVER MEMBER INTEGRAL WITH SAID SHANK, AND AN AXIALLY DISPLACEABLE PUSHER ELEMENT SHIFTABLE RELATIVELY TO THE AXIS OF SAID BODY, SAID LEVER MEMBER SAID SHANK, SAID PUSHER ELEMENT HAVING A FACE GENERALLY TRANSVERSE TO THE AXIS OF SAID BODY, SAID LEVER MEMBER HAVING A FIRST LEVER PORTION EXTENDING FROM SAID SHANK INWARDLY INTO THE PATH OF SAID PUSHER ELEMENT AND ENGAGEABLE BY SAID FACE THEREOF, SAID FIRST LEVER PORTION HAVING AN OBLIQUE SURFACE COOPERATING WITH SAID FACE AND EXTENDING LINEARLY FROM SAID SHANK INTO CONTACT WITH SAID FACE WHILE LYING IN THE PLANE INCLINED TO SAID AXIS AND OUTWARDLY THEREFROM IN THE DIRECTION OF DISPLACEMENT OF SAID PUSHER ELEMENT, SAID LEVER MEMBER BEING SWINGABLE WITH RESPECT TO SAID SHANK UPON ENGAGEMENT OF SAID PUSHER ELEMENT WITH SAID FIRST LEVER PORTION THROUGH AN ANGLE UPWARDLY OF ABOUT 90. AND HAVING A SECOND LEVER PORTION REMOTE FROM SAID FIRST LEVER PORTION ADAPTED TO BE FORCED AGAINST SAID REMOTE SURFACE BY SAID PUSHER ELEMENT, SAID PUSHER ELEMENT BEING PROVIDED WITH AT LEAST ONE PERIPHERAL RECESS INTERRUPTING THE PERIPHERY OF SAID ELEMENT, AND SAID SHANK BEING PROVIDING WITH AT LEAST ONE RETAINING ELEMENT EXTENDING INTO THE BORE OF SAID SHANK, THE UNINTERRUPTED PORTION OF THE PERIPHERY OF SAID PUSHER ELEMENT BEING OF GREATER CIRCUMFERENTIAL EXTENT THAN THE CIRCUMFERENTIAL EXTENT OF SAID RETAINING ELEMENT, WHEREBY THE FREE END OF SAID RETAINING ELEMENT IS ENGAGEABLE IN SAID RECESS IN ONE RELATIVE ANGULAR POSITION OF SAID BODY AND SAID ELEMENT AND DISENGAGEABLE IN ANOTHER RELATIVE ANGULAR POSITION FOR RELEASABLY SECURING SAID PUSHER ELEMENT AGAINST AXIAL DISPLACEMENT WITHIN SAID BODY.