Patent ID: 8672298

Claim:
A jack comprising: an outer tube being a hollow tube and a positioning member and a driving rod respectively connected to the outer tube, the positioning member being positioned by an object and the driving rod being driven by a crank; an inner tube located in the outer tube and a stand connected to a lower end of the inner tube; a lifting device located on a top of the inner tube so as to lift the outer tube, and the positioning member located on a top of the outer tube and the driving rod located below the positioning member, the positioning member being positioned by a pivotal device which pivots the positioning member, the positioning member being a U-shaped member and having a pivotal hole, multiple insertion holes and clamp holes, the pivotal device having a disk and a handle, the disk having a central hole and multiple positioning holes being located around the central hole, the handle connected to the disk by inserting a positioning protrusion into the insertion hole, multiple insertion rods inserted into the insertion holes, a bolt extending into the pivotal hole of the positioning member and the central hole of the disk so that the positioning member is pivotably connected to the outer tube, the disk being fixed to the outer tube.