Abstract: A self-deploying stabilizing support jack is presented which stabilizes and positions a recreational vehicle or trailer. The support jack comprises a bracket, a two-cylinder, lift arms and a stabilizing sleeve. The lift arms and cylinder are attached to the bracket at separate, offset first and second points so that when the ram of the cylinder contacts the foot of the lift arm, the entire apparatus is raised to a horizontal position. A stabilizing sleeve attached to the lift and surrounding the cylinder stabilizes the the device from lateral movement. An intermediate third pivot point in the lift arm helps reduce stress upon raising. Also provided is an automatically released pressure valve for the cylinder and a signalling device to warn the operator when the support jack is in the deployed position. A safety circuit also automatically raises any support jack that is not in the horizontal safety position should the ignition be turned to the "ON" position.

Abstract: The present invention provides a three-piece telescoping jack that is capable of rapid coarse adjustments in height. The invention comprises first, second and third elongated tubular members that are somewhat nested in a telescoping relationship. The invention further comprises fine adjustment means for holding and adjusting the position of the second member in relation to the first and coarse adjustment means for holding and adjusting the position of the third member in relation to the second. The coarse adjustment means further allow the position of the third member to be rapidly adjusted, either retracted or extended, in relation to the second member. In a preferred embodiment, the fine adjustment means are a threaded nut and bolt. Also in a preferred embodiment, the coarse adjustment means are a pin and a series of holes in the second and third members.

Abstract: A kind of vise comprising a back jaw and a front jaw which are separately provided with a plurality of different jaw faces corresponding to one another for pinching different shapes of things or material, the faces are changeable in their position by turning for choosing the most proper one for pinching a thing to be worked on. A punch set on the screw is also able to punch a hole.