Expansible chamber devices – Piston with rigid axially extending hollow stem – Relatively movable elongated part within stem
Patent
1976-05-17
1977-09-27
Cohen, Irwin C.
Expansible chamber devices
Piston with rigid axially extending hollow stem
Relatively movable elongated part within stem
91422, 92129, 92143, 92171, F01B 300, F16J 110
Patent
active
040503593
ABSTRACT:
A hydraulic system for a combined power trim and shock absorbing piston-cylinder unit of an outboard motor includes a reversible pump means having a trim-up port connected by a pressure responsive pilot valve piston cylinder units and a trim-down port through a reverse lock solenoid valve and a down-pilot spool valve providing full drain flow for trim-up and power flow for trim-down. An "up-reverse" pilot valve with a pressure operator is in parallel with the reverse lock valve and provides a restricted by-pass for limited trim-up in reverse. The trim-up hydraulic input or powered side of the cylinder units define a trapped hydraulic system creating "memory" in the system so after impact the motor returns to the original trim position. The return side permits relatively free-flow to permit "trail-out" under low impact. At high speed impact, the flow is restricted and cylinder pressure increases. At a selected point, a shock valve within the piston-cylinder opens and absorbs the shock forces. The piston unit includes an inner floating head telescoped into a head secured to the piston rod with a chamber thereby formed to store the liquid flow during shock movement. A metered orifice and check valve allows return to the original trim-set position.
REFERENCES:
patent: 2186266 (1940-01-01), Onions
patent: 2679827 (1954-06-01), Pardue
patent: 2761425 (1956-09-01), Bertsch et al.
patent: 2858802 (1958-11-01), Parsons et al.
patent: 2893209 (1959-07-01), Colley
patent: 3426651 (1969-02-01), Arendarski
patent: 3871527 (1975-03-01), Schimmeyer et al.
Brunswick Corporation
Cohen Irwin C.
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