Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1975-01-20
1976-10-05
Blunk, Evon C.
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
182141, 254122, B66B 1104, E04G 122
Patent
active
039839605
ABSTRACT:
An improved scissors lift is provided which includes a working platform, two scissors linkages, a frame, and an hydraulic mechanism, all of which combine to permit the working platform to be elevated in a horizontal plane to any desired height, and to permit the lift to be collapsed to a compact position when not in use. The hydralic mechanism, in the form of one or more hydraulic cylinder/piston units, is mounted on the scissors linkages in an essentially vertical position in appropriate cradles between two of the arm pairs of the linkages, at a position in which there is substantial movement at both ends of the hydraulic unit. The cylinder/piston hydraulic unit is so mounted to exert a thrust primarily in the direction of the load for all positions of the linkages, and to provide an essentially constant load/thrust/speed ratio for all positions of the linkages, and also to permit full extension of the linkages without excessive movement of the hydraulic piston.
REFERENCES:
patent: 2402579 (1946-06-01), Ross
patent: 3003746 (1961-10-01), Gridley
patent: 3032319 (1962-05-01), Dale
patent: 3259369 (1966-07-01), Gridley
patent: 3446379 (1969-05-01), Phillips
patent: 3486583 (1969-12-01), Wiklund
patent: 3796282 (1974-03-01), Denier
Ballymore Co. Advertisement, Modern Materials Handling, vol. 26, No. 1, Jan., 1971, p. 91.
Ballymore Co. Sales Bulletin S-70R, West Chester, Pennsylvania. hydraulic
Blunk Evon C.
Rowland James L.
Staines Robert
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