Amphibious vehicle retractable suspension

Marine propulsion – Self-propelled vehicle having land and water propulsion means – Having separated propulsion means for land and water

Reexamination Certificate

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Details

C440S012660

Reexamination Certificate

active

10851016

ABSTRACT:
Amphibious vehicle (1, FIG.1) has retractable road wheels (2, 2′, FIG.1). This may allow planing. During marine travel, at least one wheel may droop below the water line. This increases drag, particularly when cornering. Suspension height sensor22may be arranged to detect a threshold beyond which the wheel should not be allowed to droop over water, unless mode change is in progress. When this threshold is passed, pump18co-operates with controller15to pump fluid into lower chamber7′of actuator5to retract the wheel. Switchable valves9, 19, 21, and23are provided to allow adjustment of fluid chamber volumes. Gas filled accumulators11may be provided where a hydraulic suspension is used. Numeral42represents an adjustable trim tab. FIG.4shows an alternative fluid system layout, with valves19, 19′, and110to allow fluid to be returned to tank18′.

REFERENCES:
patent: 5145205 (1992-09-01), Takehara et al.
patent: 5562066 (1996-10-01), Gere et al.
patent: 6282470 (2001-08-01), Shono et al.
patent: 6945832 (2005-09-01), Roycroft
patent: 2002/0000699 (2002-01-01), Ruddle
patent: 2003/0047899 (2003-03-01), Gibbs
patent: 2005/0239351 (2005-10-01), Darby et al.
patent: 2 402 106 (2004-01-01), None
patent: 2 402 108 (2004-12-01), None
patent: WO94/00332 (1994-01-01), None
patent: WO03/045716 (2003-06-01), None
Combined Search and Examination Report for Application No. GB0411569.7; Jul. 21, 2004.
Combined Search and Examination Report for Application No. GB0411570.5; Jul. 21, 2004.

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