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US 6,474,624 B2Granted
Hydraulic jack
AssigneeKayaba Kogyo Kabushiki Kaisha
InventorKyozi Sawano
Life of this patent
Estimating the term…
Abstract
To facilitate an operation for feeding a jack part into a desired position. A jack part 2, which extends when pressure oil from an oil pressure supply and discharge part 1 is supplied, and contracts when oil is recovered to the oil pressure supply and discharge part 1, is a pantograph type, and a wheel 5 is held in front which is one end in a folded state.
Claims7
A hydraulic jack comprising:
- an oil pressure supply and discharge part;
- and
- a 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.
A hydraulic jack comprising:
- a pressure supply/discharge part;
- a flow passage connected to said supply/discharge part;
- a jack part in communication with said supply/discharge part through said flow passage, said jack part including a hydraulic cylinder with a hydraulic piston connected to a driving link, and a pantograph linkage connected to said hydraulic piston through said driving link, said pantograph linkage including first links with first and second ends, said first ends being pivotally connected to said hydraulic cylinder, said second ends including a shaft, said pantograph linkage having second links with first and second ends, said first ends of said second links being pivotally connected to said shafts of said second ends of said first links, said jack part includes a pressure receiving plate connected to said second ends of said second links;
- a wheel pivotally mounted on one of said shafts connecting said first and second links.
1 more element
A hydraulic jack comprising:
- a jack part including a hydraulic cylinder with a hydraulic piston connected to a driving link, and a pantograph linkage connected to said hydraulic piston through said driving link;
- a wheel rotatably connected to said pantograph linkage;
- a flow passage connected to said jack part;
- a pressure supply/discharge part in communication with said jack part through said flow passage, said oil pressure supply and discharge part including a pump and a tank, said tank including a bellows type bladder for setting a volume chamber in said tank, said tank also including a protective casing formed of a visible material for receiving said bladder.
1 more element
Dependencies are inferred from the claim text.