Longitudinally movable landing gear for trailers and the like

Claim 1

In a chassis frame having trackways at the sides, a horizontal frame slidably mounted on said trackways, a landing gear on said slidable frame having extending portions with ground-engaging means thereon, said extending portions being mounted for vertical movement relative to the slidable frame, a pair of drivable wheels on said slidable frame engageable with said trackways drive means carried by said landing gear for raising and lowering the extending portions thereof, means for driving said drive means, said slidable frame being raisable to a position wherein said driveable wheels are out of contact with said trackways when upon actuating said drive means there is sufficient downward movement of said extending portions to cause said landing gear to function as a lifting jack means thereby raising said slidable frame to said position, means for retaining said slidable frame fixed in said position to prevent any movement relative to the chassis frame, and additional drive means actuated by the landing gear drive means for simultaneously driving said drivable wheels of the slidable frame, so that upon releasing of said retaining means the operation of the landing gear drive means to raise the extending portions and the groundengaging means from the ground lowers the slidable frame and engages the drivable wheels with the trackways which moves the frame rearwardly as the extending portions continue to be raised by the further operation of the landing gear drive means.