Multiple section mast with a pair of lift jacks behind the prima

Details Multiple section mast with a pair of lift jacks behind the prima Multiple section mast with a pair of lift jacks behind the prima

1980-11-10

1983-01-25

Rolla, Joseph J.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

414642, B66B 920

Patent

active

043698611

ABSTRACT:
A pair of three-element, constant speed lift jacks are positioned at the rear of the stationary mast section uprights above the tilt jack connections with the same uprights, thus permitting the mast to be close-coupled to the front of a counterbalanced lift truck. The support for the lower ends of the lift jacks, at the rear of the primary uprights, are reinforced by the pivot brackets for the tilt jacks and also by an intermediate cross tie between the primary uprights.

REFERENCES:
patent: 2421472 (1947-06-01), Way
patent: 2456320 (1948-12-01), Repke
patent: 2581791 (1952-01-01), Gilman
patent: 3394778 (1968-07-01), Brinton
patent: 3529739 (1970-09-01), Shaffer
patent: 4030568 (1977-06-01), Heinold
patent: 4191092 (1980-03-01), Farmer
patent: 4191276 (1980-03-01), Farmer et al.
patent: 4219302 (1980-08-01), Leskovec
patent: 4280592 (1981-07-01), Bartow
"Telescoping Cylinder Stages Extend, Retract Simultaneously, at Constant Speed", Esser and Seshasal, Hydraulics & Pneumatics Magazine, pp. 144-145, Oct. 1979.
"A Trend in Lift Trucks", Modern Material Handling Magazine, pp. 78-81, Apr. 1980.

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