Resilient engagement device

Claim 1

IN A STRUCTURE OF THE CLASS DESCRIBED, A MEMBER ADAPTED TO BE PROVIDED WITH A RESILIENT ENGAGEMENT ELEMENT, AND A SELF-CONTAINED, PRE-ASSEMBLED RESILIENT ENGAGEMENT STRUCTURE COMPRISING A HEAD PORTION WITH A REARWARDLY EXTENDING CONTROL SHAFT OF SMALLER CROSS SECTIONAL DIMENSION AND A WASHER ELEMENT PERFORATED TO RECEIVE SLIDABLY THE END OF SAID CONTROL SHAFT, THERE BEING BETWEEN THE SAID HEAD AND THE SAID WASHER AT LEAST ONE BODY OF RESILIENT SUBSTANCE THROUGH WHICH SAID CONTROL SHAFT PASSES, SAID BODY HAVING CYLINDRICAL OUTER SURFACE, MEANS ON THE END OF SAID CONTROL SHAFT TO PREVENT ITS WITHDRAWAL THROUGH THE PERFORATION OF SAID WASHER, THE SAID RESILIENT ENGAGEMENT DEVICE BEING LOCATED WITHIN A BORE FORMED IN THE SAID MEMBER IN WHICH SAID BODY OF RESLIENT SUBSTANCE FITS TIGHTLY ENOUGH TO MINIMIZE ENTRANCE OF FINES AND LIQUID WITHIN SAID BORE, AT LEAST ONE OF THE AFOREMENTIONED ELEMENTS HAVING A RECESS INTO WHICH A PORTION OF SAID BODY OF RESILIENT SUBSTANCE MAY MOVE UNDER PRESSURE AND MEANS FOR HOLDING THE SAID RESILIENT ENGAGEMENT DEVICE WITHIN SAID BORE COMPRISING MEANS ENGAGEABLE WITH SAID MEMBER AND BEARING UPON SAID WASHER.