Expansible reciprocating piston

Claim 1

AN EXPANSIBLE PISTON DISPOSED FOR CONNECTION TO A PISTON ROD FOR RECIPROCAL MOVEMENTS WITHIN A CYLINDER BORE, SAID PISTON COMPRISING A CENTRALLY DISPOSED PISTON SUPPORT BODY DISPOSED FOR CONNECTION TO SAID PISTON ROD, SAID PISTON SUPPORT BODY HAVING FIRST AND SECOND OPPOSED END PORTIONS AND AN AXIALLY EXTENDING OUTER BODY SURFACE RADIALLY SPACED INWARDLY FROM SAID CYLINDER BORE, SAID FIRST END PORTION OF SAID PISTON SUPPORT BODY HAVING ABUTMENT SUPPORT FLANGE SURFACE MEANS EXTENDING RADIALLY FROM SAID OUTER BODY SURFACE OF SAID PISTON SUPPORT BODY AND TERMINATING WITHIN THE LIMITS OF SAID CYLINDER BORE, SAID SECOND END PORTION OF SAID PISTON SUPPORT BODY HAVING CLAMPING MEANS INCLUDING CLAMPING MEMBER MEANS, CONNECTING MEANS FOR DETACHABLY CONNECTING SAID CLAMPING MEMBER MEANS TO SAID SECOND END PORTION OF SAID PISTON SUPPORT BODY, SAID CLAMPING MEMBER MEANS INCLUDING ABUTMENT CLAMPING FLANGE SURFACE MEANS RADIALLY EXENDING FROM SAID OUTER BODY SURFACE OF SAID PISTON SUPPORT BODY AND TERMINATING WITHIN THE LIMITS OF SAID CYLINDER BORE, SAID CLAMPING MEMBER MEANS HAVING A LATERALLY EXTENDING SURFACE SPACED FROM AND DISPOSED IN FACE-TOFACE RELATION TO SAID SECOND END PORTION OF SAID PISTON SUPPORT BODY TO PROVIDE A CLEARANCE SPACE THEREBETWEEN, SAID ABUTMENT CLAMPING FLANGE SURFACE MEANS AND SAID ABUTMENT SUPPORT FLANGE SURFACE MEANS OPPOSING AND FACING EACH OTHER, EXPANSIBLE BAND MEANS HAVING AN OUTER SUBSTANTIALLY CYLINDRICAL SURFACE FOR SLIDABLY ENGAGING SAID CYLINDER BORE AND COMPRISING A FIRST BAND PORTION, A SECOND BAND PORTION, AND AN INTERMEDIATE BAND PORTION BETWEEN SAID FIRST AND SECOND BAND PORTIONS, SAID INTERMEDIATE BAND PORTION HAVING INNER SURFACE CAM MEANS RADIALLY SPACED FROM AND ANNULARLY DISPOSED ABOUT SAID OUTER BODY SURFACE OF SAID PISTON SUPPORT BODY, SAID FIRST AND SECOND BAND PORTIONS RESPECTIVELY OF SAID BAND MEANS HAVING FIRST AND SECOND ABUTMENT OPPOSED END SURFACES RESPECTIVELY CLAMPED BETWEEN SAID ABUTMENT SUPPORT FLANGE SURFACE MEANS AND SAID ABUTMENT CLAMPING FLANGE SURFACE MEANS, SAID INNER SURFACE CAM MEANS HAVING FIRST AND SECOND TERMINATING ENDS AXIALLY SPACED RESPECTIVELY FROM SAID ABUTMENT SUPPORT FLANGE SURFACE MEANS AND SAID ABUTMENT CLAMPING FLANGE SURFACE MEANS AND AXIALLY MOVABLE CAM MEANS DISPOSED BETWEEN SAID OUTER BODY SURFACE OF SAID PISTON SUPPORT BODY AND SAID INNER SURFACE CAM MEANS FOR EXPANDING SAID BAND MEANS RELATIVE TO SAID CYLINDER BORE, SAID ABUTMENT CLAMPING FLANGE SURFACE MEANS COMPRISING FIXED SURFACE DRIVING MEANS ENGAGING SAID CAM MEANS AND FORCIBLY DRIVING SAID CAM MEANS AGAINST SAID INNER SURFACE CAM MEANS OF SAID BAND MEANS, SAID CONNECTION MEANS UPON CONNECTING SAID CLAMPING MEMBER MEANS TO SAID SECOND END PORTION OF SAID PISTON SUPPORT BODY MOVING SAID LATERALLY EXTENDING SURFACE TOWARD SAID SECOND END PORTION OF SAID PISTON SUPPORT BODY AND ALSO AXIALLY MOVING SAID CAM MEANS RELATIVE TO SAID INNER SURFACE CAM MEANS TOWARD SAID ABUTMENT SUPPORT FLANGE SURFACE MEANS AND THEREBY EXPANDING SAID BAND MEANS, SAID FIRST AND SECOND ABUTMENT OPPOSED END SURFACES OF SAND BAND MEANS UPON BEING CLAMPED BETWEEN SAID ABUTMENT SUPPORT FLANGE SURFACE MEANS AND SAID ABUTMENT CLAMPING FLANGE SURFACE MEANS ARRESTING THE AXIAL MOVEMENT OF SAID LATERALLY EXTENDING SURFACE BEFORE IT ENGAGES SAID SECOND END PORTION OF SAID PISTON SUPPORT BODY TO THEREBY MAINTAIN SAID CLEARENCE SPACE, WHEREBY SAID EXPANDABLE BAND MEANS IS SOLIDLY CLAMPED BETWEEN SAID ABUTMENT SUPPORT FLANGE SURFACE MEANS AND SAID ABUTMENT CLAMPING FLANGE SURFACE OF SAID BAND MEANS UPON ABUTMENT OPPOSED END SURFACE MEANS, SAID FIRST AND SECOND BEING CLAMPED BETWEEN SAID ABUTMENT SUPPORT FLANGE SURFACE MEANS AND SAID ABUTMENT CLAMPING FLANGE SURFACE MEANS ALSO LIMITING THE AXIAL EXTENT TO WHICH SAID CLAMPING MEMBER MEANS MAY FORCE SAID CAM MEANS AGAINST SAID INNER SURFACE CAM MEANS OF SAID BAND MEANS FOR ARRESTING THE EXPANSION OF SAID BAND MEANS RELATIVE TO SAID CYLINDER BORE.