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
Patent
1997-03-31
1999-10-19
Nappi, Robert E.
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
414556, 197240, B66B 128, B66B 916, B60P 100
Patent
active
059693029
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 pressure inside the hydraulic pump, external switches, and a controller which includes a CPU, a timer and a semiconductor switch and serves to calculate on real time the speed of the tail gate from signals from the sensor and the timer. The position of the tail gate is accurately determined therefrom and the tail gate is gradually started, accelerated and decelerated to prevent damage to its cargo.
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patent: 5333533 (1994-08-01), Hosseini
Fujisawa Hitoshi
Izumida Yutaka
Nishizawa Kazumi
Nappi Robert E.
Nikko Electric Industry Co., Ltd.
Pabco Co., Ltd.
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