Material or article handling – Self-loading or unloading vehicles – Loading or unloading by other carrier or mover means – and...
Reexamination Certificate
2007-11-06
2007-11-06
Kramer, Dean J. (Department: 3652)
Material or article handling
Self-loading or unloading vehicles
Loading or unloading by other carrier or mover means, and...
C414S556000, C414S921000
Reexamination Certificate
active
10100200
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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Donald Sievenpiper A.
Richard Thurman L.
Kramer Dean J.
Mechanical Tech & Engineering Co.
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