Two-speed passenger lift and pump assembly therefor
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United States of America Patent
Stats
-
Nov 6, 2007
Grant Date -
Dec 12, 2002
app pub date -
Mar 16, 2002
filing date -
Mar 17, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A passenger lift includes a lift platform that operates between a generally vertical stowed position in a motor vehicle, a substantially horizontal position at the height of the vehicle floor, and a position resting on the ground. The passenger lift is actuated by hydraulic cylinders responsive to hydraulic pressure and fluid flow from a hydraulic pump driven by a DC electric motor, in cooperation with direction and flow control components. A power-dissipating resistor is switched into and out of series with the motor to effect selected two-speed operation of the motor, the pump, the actuating cylinders and the passenger lift platform, such that one speed is used for deployment and retraction of the lift platform from and to the stowed position, and the second speed is used to raise and lower the lift platform and passenger between the vehicle and the ground.
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