Patent ID: 7913361

Claim:
A door handle system comprising: a door opening lever swingably assembled to a door panel and configured to be linked to a door latch so as to open a door by a pulling operation; a damper including a cylinder, a one-piece piston disposed in the cylinder, a piston rod upon which the one-piece piston is slidably disposed, and a biasing member for constantly biasing the one-piece piston in a direction away from a depth end of the cylinder, the damper being configured so as to provide a resistance of a fluid to a retracting movement of the one-piece piston against a biasing action of the biasing member, the fluid being sealed in the cylinder, the one-piece piston comprising: a large diameter rear end and a small diameter portion integrally connected to the rear end by a plurality of connection portions, at last one window formed in the connection portions which communicate with a first through hole formed in the smaller diameter portion, a groove formed in an external periphery of the large diameter rear end, the groove cooperating with an inner wall of the cylinder to define an orifice, the large diameter rear end having a second through hole therein; and a support for the damper, fixed to the door panel; wherein the door opening lever has an operating part formed on one end thereof and a pressing part formed on the other end thereof with respect to a swingable shaft, the pressing part having a cam surface, the cam surface being configured so as to have a distance from the swingable shaft gradually increasing toward a cam end; wherein the damper is configured so that the cylinder is fixed to the support, and that the piston rod has an outer end constantly brought into press-contact with the cam surface of the door opening lever under the biasing action; and wherein the damper is configured so that a portion of the cam surface close to the cam end is brought into press-contact with the outer end of the cylinder to retract the piston into the cylinder at a maximum when the door opening lever is not subjected to the pulling operation.