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
1995-01-25
1997-01-28
Nappi, Robert
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
187274, 187394, 91170R, B66B 904, B66B 104
Patent
active
055979874
ABSTRACT:
A twin post, telescoping jack hydraulic elevator system has a pair of dynamic sensors to determine when the jacks are out of synchronization, by determining any relative differences in height between the two intermediate cylinders. The elevator also includes static sensors to determine if one or both intermediate cylinders are more than a predetermined distance away from their normal positions when the car is stopped at each floor. The controller actuates a resynchronization if the distance between the intermediate jacks exceeds a first threshold, and shuts down the elevator if the distance exceeds a second threshold or if resynchronization demands are issued too often. Preferably, the static sensors are positioned to detect the seal housing at the top of the intermediate cylinder, which projects outwardly from the cylinder.
REFERENCES:
patent: 4043428 (1977-08-01), White et al.
patent: 4201053 (1980-05-01), Atkey
patent: 4357995 (1982-11-01), Kappenhagen
patent: 4706458 (1987-11-01), Corghi
patent: 5060762 (1991-10-01), White
patent: 5065844 (1991-11-01), Hon
Gilliland Oscar
Hughes Martin W.
Thurmond, III Charlie R.
Tomes Paul
Vafaie Foad
Delaware Capital Formation Inc.
Nappi Robert
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