Securing of closures or end caps to cylinders

Claim 1

A CYLINDER FOR HOUSING A PISTON, WHICH CYLINDER COMPRISES: (A) FIRST PART BORED TO PROVIDE A CYLINDER SPACE WITHIN IT; (B) A CLOSURE PART AT ONE END OF THE FIRST PART; (C) A PORTION OF THE CLOSURE PART WHICH IS DISPOSED WITHIN THE BORE OF THE FIRST PART; (D) A MEMBER MOVABLY MOUNTED ON SAID PORTION; (E) A RADIALLY FACING PERIPHERAL FIRST GROOVE PROVIDED BY OPPOSED INCLINED FACES ON THE PORTION OF THE CLOSURE PART AND THE MEMBER MOVABLY MOUNTED THEREON RESPECTIVELY; (F) A TRIANGULAR CROSS-SECTION PERIPHERAL GROOVE IN SAID FIRST PART; (G) WHICH GROOVE FACES THE FIRST SAID GROOVE; (H) A RESILIENT RING WHICH IS CAPABLE OF RADIAL EXPANSION AND CONTRACTION; (I) WHICH RING CAPABLE WHEN CONTRACTED TO BEING ACCOMMODATED WITHIN THE FIRST SAID GROOVE AND SPACED FROM THE SECOND SAID GROOVE; (J) AND WHICH RING IS CAPABLE WHEN EXPANDED OF BEING ACCOMMODATED PARTIALLY WITHIN THE FIRST SAID GROOVE AND PARTIALLY WITHIN THE SECOND SAID GROOVE; (K) MEANS FOR MOVING SAID MOVABLE MEMBER RELATIVELY TO SAID PORTION OF THE CLOSURE PART TO TEND TO CLOSE THE FIRST SAID GROOVE TO EXPAND THE RING RADIALLY INTO THE SECOND SAID GROOVE, AND TO TEND TO OPEN THE FIRST SAID GROOVE TO PERMIT THE RING TO CONTRAT WHEREBY THE RING MOVE RADIALLY OUT OF THE SECOND SAID GROOVE; (L) WHICH MEANS ARE OPERABLE FROM OUTSIDE THE CYLINDER.