Mobile lifting device for the disabled
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United States of America Patent
Stats
-
Feb 6, 2001
Grant Date -
N/A
app pub date -
Jul 26, 1994
filing date -
Jul 26, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A mobile lifting device includes a car having a gate and a docking plate mechanically interconnected at one end of the car. A low voltage DC control system includes an 'up' circuit, a 'down' circuit connected in parallel with the up circuit, and a sensor circuit in series with the up circuit and down circuit. The sensor circuit includes a plurality of series connected switches for automatically preventing operation of the lifting device if predetermined conditions are not met. The 'up' circuit includes a switch positioned on a stage and connected to the control circuit by a coiled cable. A wand on the switch engages a knob on the side of the car when the car reaches the level of the stage, actuating the switch to stop the car. In the event of a power failure, a battery supplies power for opening a solenoid valve to lower the car. Three control panels are provided, one at each end of the car and one in the middle of the car. Each control panel includes a switch for causing the car to be raised or lowered and the switches are electrically interlocked to prevent simultaneous operation of relays for up and down motion. The control panel in the car can be disabled.
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