Patent ID: 8272166

Claim:
A self-propelled forward movement system, which is adapted to automatically move a movable member forward up to a stop position after the movable member is moved forward to a self-propelled movement start position, the movable member being adapted to have an upper portion housed in and supported by a rail member, comprising: a striker configured to be disposed in the rail member; a catcher configured to be housed in a recess so as to be movable along a moving direction of the movable member, the recess being formed in the upper portion of the movable member so as to extend along the moving direction; a biasing member for the catcher; the catcher including a catcher stopper, a holder for a striker, and a biasing member for the catcher stopper and the holder, the catcher stopper being disposed so as to protrude and enter with respect to a catcher body, the holder being disposed so as to be movable forward and backward and receive the striker from forward in a non-holding state; the catcher stopper being configured so that when the catcher stopper protrudes from the catcher body, the holder is set in a forward position and in the non-holding state by the biasing member, and when the holder is set in a backward position and in a holding state, the catcher stopper is withdrawn into the catcher body; and the recess having an engageable hole, which the catcher stopper is brought into engagement with when protruding, the engageable hole being disposed to store a force in the biasing member when the catcher is set in a reference position where the catcher stopper is brought into engagement with the engageable hole; wherein the striker enters into the holder of the catcher when the catcher is set in the reference position in a case where the movable member is moved forward to the self-propelled movement start position.