Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1980-05-07
1982-11-09
Spar, Robert J.
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
182 63, 52115, B66B 1104
Patent
active
043579949
ABSTRACT:
A vertically elongated frame is provided including pairs of opposite sides and each opposite side includes a pair of upstanding opposite side guides. First, second and third pairs of upper, intermediate and lower hydraulic cylinders are provided on each frame side and the lower portion of each upper cylinder lower portion is communicated with the upper portion of the next lower cylinder upper portion whereby fluid pressure in all of the cylinders is maintained equal and the cylinders may extend in sequence with the upper cylinders extending first, the intermediate cylinders extending second and the lower cylinders extending last. Further, the equalization of the fluid pressures within the cylinders also enables the cylinders to retract in sequence with the lower cylinders retracting first, the intermediate cylinders retracting second and the upper cylinders retracting third. With all of the interiors of the hydraulic cylinders communicated a single supply line may be provided to supply hydraulic fluid under pressure thereto and safety valves may be operatively associated with the various upper, intermediate and lower cylinders of automatically preventing the venting of hydraulic fluid therefrom in the event a hydraulic leak occurs in the main supply system to the cylinders.
REFERENCES:
patent: 815594 (1906-03-01), Kovacevic
patent: 3338334 (1967-08-01), Matthews
patent: 3360078 (1967-12-01), Hopsold
patent: 3534664 (1970-10-01), Ulinski
patent: 3970171 (1976-07-01), Honecker et al.
Jacobson Harvey B.
Noland Kenneth
Spar Robert J.
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