Lift truck mast having high visibility and extensibility

Details Lift truck mast having high visibility and extensibility Lift truck mast having high visibility and extensibility

1979-07-18

1981-04-14

Bartuska, F. J.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

414631, B66B 920

Patent

active

042614384

ABSTRACT:
An extensible-contractible four-stage telescopic mast for a lift truck having a single fluid-actuated ram of low-collapsed height for high visibility which accomplishes both free lift and mast extension. The associated chain reeving of the mast provides a lesser ratio of load carriage speed to ram extension speed during free lift than during mast extension. To obtain substantially uniform speed of the load carriage throughout its lifting range, the ram assembly has a variable speed of extension substantially inversely proportional to such ratio such that ram speed is higher during free lift than during mast extension. An arrangement of the four mast sections, associated chain reeving and hydraulic conduits is provided which is especially conducive to high visibility and maximum load capacity.

REFERENCES:
patent: Re27731 (1973-08-01), McIntosh
patent: 3051265 (1962-08-01), Boyajian et al.
patent: 3172339 (1965-03-01), Quayle
patent: 3188917 (1965-06-01), Quayle
patent: 3235033 (1966-02-01), Quayle
patent: 3235034 (1966-02-01), Quayle
patent: 3394778 (1968-07-01), Brinton
patent: 3638761 (1972-02-01), Ohta
patent: 3968859 (1976-07-01), Ehrhardt
patent: 4008648 (1977-02-01), Farmer et al.
patent: 4026432 (1977-05-01), Abels

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