Expansible chamber devices – Rotating cylinder – Plural cylinders
Patent
1995-06-26
1997-08-12
Denion, Thomas E.
Expansible chamber devices
Rotating cylinder
Plural cylinders
92 71, 92135, 417269, F01B 1304
Patent
active
056554303
ABSTRACT:
A hydraulic helm pump used for vessel steering has a housing, a barrel rotating in the housing, and one or more cylindrical pistons reciprocating in the barrel. The barrel has a separate abutment surface at the end of each piston bore and spaced from each respective piston. The pistons are solid, not hollow. A compression spring is interposed between each respective piston and the abutment surface and the spring outside diameter is about equal to the maximum diameter of the piston. When each piston is in its forward position, its forward end is very close to the abutment surface, thereby reducing unswept volume. And each piston return spring occupies most of the remaining otherwise-unswept volume between the piston and its bore. The pistons are random-fitted to their bores and include resilient piston-and-bore seal members.
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Denion Thomas E.
IMO Industries Inc.
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