Pumps – Expansible chamber type – Plural pumping chambers
Patent
1999-03-17
2000-11-28
Freay, Charles G.
Pumps
Expansible chamber type
Plural pumping chambers
92 51, 91169, F04B 3910, F01B 720
Patent
active
061527092
ABSTRACT:
A hydraulic drive cylinder with a cylinder tube, which at its respective ends has a cylinder base and a cylinder head, thus delimiting a cylinder space. A piston can move to and fro in the cylinder space between the cylinder base and the cylinder head, which piston delimits a head-side chamber and a base-side chamber, which chambers are sealed off from one another by the piston. The piston rod has a free end which is delimited by an end face, which end face is situated in the head-side chamber. At the said free end, the piston rod is provided with a first stop. The piston is provided with a projection which extends towards the cylinder head inside the head-side chamber and is provided, at a distance from the piston, with a second stop, in such a manner that the piston rod can move to and fro along an axial travel with respect to the piston, between a retracted position with respect to the piston and an extended position with respect to the piston, in which the first and second stops bear against one another, and in such a manner that when hydraulic pressure is present in the head-side chamber the piston rod adopts the extended position with respect to the piston.
REFERENCES:
patent: 762627 (1904-06-01), Fink
patent: 2893353 (1959-07-01), Short, Jr.
patent: 3008454 (1961-11-01), Wilkins
patent: 3269275 (1966-08-01), Waite
patent: 3614912 (1971-10-01), Nepp
patent: 4199007 (1980-04-01), Holmes
patent: 5014602 (1991-05-01), Iwata
Applied Power Inc.
Freay Charles G.
Gray Michael K.
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