Patent ID: 7056100

Claim:
A piston assembly for use in a compressor comprising at least one piston provided with a piston body at one end and a foot portion at its other end; a front casing with an inner wall surface defining a longitudinally extending recess in a position apposed to said piston; the piston body and the foot portion of said piston being connected by a bridge that is being resistant and projects outwardly into the apposed recess; and said bridge having a pair of symmetric wings with each of said wings projecting laterally from along the full length of each side of the bridge of said piston, the diameter of the external profile of said wings being substantially the same as the diameter of the adjacent inner wall so that said wings are in contact with and are supported by said inner wall cooperating to support and lock said piston against the adjacent inner wall surface of the front casing without said bridge contacting said inner wall surface defining said recess and with said wings disposed to one side of the recess.