Patent ID: 7788777

Claim:
A device for installing a piston ring comprising: a base that has a through-hole passing through the base in a vertical direction; a guide member disposed in the through-hole and fixed to the base, the guide member having a concave part for receiving a head of a piston that is suspended and held downwardly in a vertical direction and swingably connected to a connecting rod, and guiding a piston ring while widening a diameter of the piston ring by means of an outer peripheral surface of the guide member; a piston pressing member disposed above the base and having a centering part that performs a centering action while coming into contact with an upper end edge of the piston suspended downwardly in the vertical direction; a driving mechanism, provided on the base, for driving the piston pressing member toward the concave part of the guide member while holding the piston pressing member; and a ring feeding mechanism that feeds the piston ring guided by the guide member upwardly, wherein the centering part of the piston pressing member is formed into the shape of a cylindrical cap that is opened downwardly and has a notch part defined by cutting off a part thereof so as not to come into contact with the connecting rod of the piston, and a tapered inner wall surface that is widened downwardly so as to come into contact with the upper end edge of the piston.