| 摘要 |
A novel mechanical camper jack for mounting on a camper body is disclosed. The jack has an outer jack housing, which mounts to the camper body, and is slidably telescoped over a jack leg. Extension and retraction of the camper jack leg is accomplished with rotation of a lead screw that is threaded through a plastic nut mounted within the jack leg. Rotation of the lead screw is effected by the operation of a right-angled gear assembly, disposed within the jack housing. The gear assembly is operated with a hand crank, which is detachably mounted to the jack via a socket assembly. In one embodiment, the hand crank is provided with a ratchet and paul mechanism. The socket is implemented so that the coupling between the hand crank and the gear assembly occurs completely within the jack housing. In this way, the socket extends through the wall of the jack housing in a manner so as to be substantially flush with the exterior surface of the jack housing. In a preferred embodiment, the plastic nut is used in combination with a steel safety nut and a plastic wear guide.
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