Automatic power trim device
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United States of America Patent
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Jun 8, 1993
Grant Date -
N/A
app pub date -
Oct 9, 1991
filing date -
Oct 9, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Marine apparatus comprising a member adapted to be mounted on a boat for pivotal movement relative thereto about an axis, and control structure for causing pivotal movement of the member about the axis, the structure including a hydraulic assembly having one end adapted to engage the boat and an opposite end engaging the member, the hydraulic assembly including a cylinder, a piston dividing the cylinder into first and second chambers, and a piston rod which is fixed to the piston and which extends through the second chamber, and structure utilizing water pressure created by relative movement between the boat and the body of water in which the boat is operating for pressurizing the hydraulic assembly, the pressurizing structure including a conduit having one end which opens forwardly and which is adapted to communicate with the body of water, and having an opposite end communicating with the first chamber, and the pressurizing structure permitting the pressure in the first chamber to decrease in response to decreasing water pressure at the one end of the conduit.
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