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US 5,233,749 AGranted
Hydraulic actuator
AssigneeNitto Kohki Co., Ltd.
InventorsMasayuki Saito, Masunari Kowada
Life of this patent
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Abstract
A hydraulic puncher comprises a cylindrical casing, a pump unit including a pump and fixedly held in the casing, a cylinder chamber defined by the cylindrical inner face and the inner end face of the pump unit, a piston reciprocatingly and slidably provided in the cylinder chamber and an oil reservoir which is formed adjacent to the pump unit in the casing and from which the pump sucks operating oil filled within the cylindrical casing.
Claims9
A hydraulic actuator comprising:
- a casing having an inner peripheral wall formed with a female screw;
- a pump unit fixedly fitted in said casing and having an inner end face, said pump unit including a pump housing having an outer surface formed with a male screw threadedly engaged with said female screw in such a way that said pump housing is fixedly held in said casing;
- a cylindrical chamber defined by said inner peripheral wall of said casing and said inner end face of said pump unit;
- a reciprocating piston assembly provided in said cylinder chamber and having an end provided with a tool;
- an oil reservoir filled with operating oil and provided adjacent to said pump unit;
- and
- said pump unit sucking said operating oil from said oil reservoir and supplying said operating oil to said cylinder chamber.
4 more elements
Dependencies are inferred from the claim text.