Lift control mechanism and method

Elevator – industrial lift truck – or stationary lift for vehicle – Having specific load support drive-means or its control – Includes control for power source of drive-means

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Details

187222, 414557, B66B 128, B60P 100

Patent

active

058641017

ABSTRACT:
A lift attached to a truck has a tail gate supported by at least one hydraulic lift and at least one tilt cylinder for respectively lifting the tail gate as a whole and rotating it for opening and closing. A control system for moving such a tail gate up and down as a whole and rotating it to open and close it is provided with a power unit including a hydraulic pump, an electric motor for the hydraulic pump, and a plurality of valves for selectably allowing or not allowing transport of a hydraulic liquid by the hydraulic pump into the hydraulic cylinders, a sensor for measuring the slope angle of the tail gate, external switches, and a controller which serves to transmit output signals to the motor and to the valves in response to input signals from the sensor and the external switches and is capable of stopping rotary motion of the tail gate at a horizontal position irrespective of the slope of the vehicle and starting and stopping the rotary motion of the tail gate gradually.

REFERENCES:
patent: 3614567 (1971-10-01), Payne et al.
patent: 4517645 (1985-05-01), Yuki et al.
patent: 4520443 (1985-05-01), Yuki et al.
patent: 4957408 (1990-09-01), Ohkura

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