Patent ID: 8485585

Claim:
A push-up device for pushing out a fuel lid openably and closably attached to a vehicle body, in an opening direction, comprising: a cylinder-shaped case fixed to a vehicle body side; a rod slidably held inside the case, and protruding from an inside of the case to push out the fuel lid; an urging device positioned between the case and the rod for urging the rod toward a direction protruding from the inside of the case; and a lock device positioned between the case and the rod for locking the rod in a backward-movement position of the case against an urging force of the urging device, wherein the lock device comprises: a cam portion positioned in a middle along an axis direction of the rod, protruding outwardly in a radial direction, and also including a stationary-side cam formed in a back surface in a protruding direction of the rod; a rotor supported in a lower-side rod portion positioned at a back in the protruding direction as a border of the cam portion so as to be capable of rotating and sliding in the axis direction, and including a movable-side cam, engaging the stationary-side cam of the cam portion, and also disengaging by sliding of the rod, for providing a rotational force in one direction; slide grooves positioned in one of an outer circumferential surface of the cam portion or an inner circumferential surface of the case, and extending in a sliding direction of the rod; slide projections positioned in the other of the outer circumferential surface of the cam portion or the inner circumferential surface of the case, and due to the sliding of the rod, relatively sliding inside the slide grooves so as to block a rotation of the rod relative to the case; engagement projections protruding from one of the outer circumferential surface of the rotor or the inner circumferential surface of the case; and lock grooves positioned in the other of the outer circumferential surface of the rotor or the inner circumferential surface of the case, and including lock portions in which the engagement projections are fitted in, wherein due to disengagement of the movable-side cam from the stationary-side cam, the rotor rotates so as to allow the engagement projections that have been fitted in the lock portions to be disengaged from the lock portions, and wherein the urging device comprises: a spring inserted to pass through the lower-side rod portion, and elastically shrunk inside the case for urging the rotor toward the cam portion; and a sleeve inserted to pass through the lower-side rod portion, and positioned between the rotor and the spring for restricting a movement of the rod in the sliding direction in a lock position of the lock device.