Method and system for a hydraulic cylinder
AssigneeXtreme Manufacturing, LLC
InventorsDon Francis Ahern, Ronald Lee Fifield
Life of this patent
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Abstract
A system and method of operating a scissors lift assembly are provided. The system includes a hollow piston rod including an internal fluid reservoir, a cylinder body that is coaxial with and at least partially surrounding the hollow piston rod, and a fluid pump in flow communication with the reservoir through a suction channel extending from the internal fluid reservoir though a transfer tube to a suction port of the fluid pump. The transfer tube is coaxial with the piston, the piston rod, and the cylinder body and a discharge port of the fluid pump is in flow communication with an extension pressure chamber.
Claims19
A fluid cylinder assembly comprising:
- a piston assembly comprising a piston coupled to a piston rod formed of a hollow body, said hollow body comprising an internal fluid reservoir;
- a cylinder body coaxial with and at least partially surrounding said hollow piston rod;
- and
- a fluid pump driven by an electric motor, a pump suction channel of said fluid pump coupled in flow communication with said internal fluid reservoir through a transfer tube extending through said piston into said internal fluid reservoir, said transfer tube coaxial with said piston, said piston rod, and said cylinder body, a piston face comprising an aperture that slidably engages said transfer tube, a discharge of said fluid pump coupled in flow communication with an extension pressure chamber, said piston positioned between said internal fluid reservoir and said pressure extension chamber.
A fluid cylinder assembly comprising:
- a fluid pump;
- a cylinder body comprising an inner surface and a pressure extension chamber coupled in flow communication with a pump discharge channel of said fluid pump;
- a piston assembly comprising:
- a piston rod comprising an internal fluid reservoir coupled in flow communication with a pump suction channel of said fluid pump through a transfer tube;
- and
- a piston face coupled to said piston rod, said piston face slidably engaged to said inner surface, said piston face slidably engaged to said transfer tube extending between said internal fluid reservoir and said pump suction channel,
- a piston positioned between said internal fluid reservoir and said pressure extension chamber.
Dependencies are inferred from the claim text.