Patent ID: 6474624
Filing Date: 2002-11-05
Classification: B66F

Abstract:
A hydraulic jack comprising: an oil pressure supply and discharge part; anda jack part connected to the oil pressure supply and discharge part through a flow passage, said jack part being provided with a hydraulic cylinder, a pantograph type link connected to the hydraulic cylinder through a driving link, and a wheel provided on the pantograph type link, said pantograph type link comprising a pair of rotatable lower links, a pair of upper links pivotally mounted on extreme ends of the lower links through shafts, and a pressure receiving plate provided on upper ends of said upper links, said driving link being rotatably connected between the hydraulic cylinder and the lower links, wherein the lower links and the upper links are provided in a paired relation as front links and rear links before and behind said hydraulic cylinder respectively, and the wheel is rotatably mounted on said shaft of said front links.