Patent
1976-07-15
1978-06-27
Reeves, Robert B.
115 17, B63H 2126
Patent
active
040968200
ABSTRACT:
A marine propulsion device includes a member adapted to be attached to a boat hull, a propulsion assembly connected to the member for vertical swinging movement, a tilt hydraulic cylinder-piston assembly connected between the member and the propulsion assembly and including a tilt cylinder having opposed first and second ends, a pressure fluid supply pump communicating with a control valve, a first conduit communicating between the first tilt cylinder end and the control valve and including a first valve preventing fluid flow from the control valve and releasably preventing fluid flow from the first tilt cylinder end, a second conduit communicating between the first tilt cylinder end and the control valve and including a second valve preventing flow from the first tilt cylinder end and releasably preventing fluid flow from the control valve, together with a let-down assembly including a third conduit communicating between the ends of the tilt cylinder and including a valve arrangement operative for temporarily affording fluid flow from the first end of the tilt cylinder to the second end thereof in response to the generation of relatively high pressure adjacent the second end thereof occurring incident to the striking of an underwater obstacle.
REFERENCES:
patent: 3508400 (1970-04-01), Mercier
patent: 3799104 (1974-03-01), Kurling
patent: 3885517 (1975-05-01), Borst
patent: 3983835 (1976-10-01), Hall
Outboard Marine Corporation
Reeves Robert B.
Wacyra Edward M.
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