Patent ID: 9656839
Date: 2017-05-23
CPC Classifications: B66F,F15B

Claim:
1. A jacking device for lifting and supporting, the jacking device comprising: a base; a hydraulic or pneumatic cylinder including a barrel portion and a rod portion, the barrel portion being mounted to the base and the rod portion being extendable from within the barrel portion to extend the jacking device; a top plate mounted at its underside to the rod portion; an annular seat member rotatably engaged to the barrel portion; and a support member movable toward or away from the top plate with rotation of the annular seat member, the support member being positionable to engage the underside of the top plate, wherein the rod portion is movable between a retracted position and an extended position, and wherein, in the extended position, the support member is positionable to be between and in contact with the top plate and the annular seat member such that the rod portion is mechanically maintained in the extended position.