Multi-stage mast assembly for portable lifts

Details Multi-stage mast assembly for portable lifts Multi-stage mast assembly for portable lifts

1994-04-18

1996-05-14

Terrell, William E.

Elevator, industrial lift truck, or stationary lift for vehicle

Industrial lift truck or required component thereof

Having extensible vertical guide for load support

187406, B66F 908

Patent

active

055159451

ABSTRACT:
A multi-stage mast assembly has its mast stages stacked front to back when retracted and has front-to-back guide rollers and side-to-side guide rollers between the mast stages and a front carriage frame. An extrusion is used for the mast stages and the carriage frame. The extrusion has a central hollow rectangular column, inwardly facing channels at the front corners, outwardly directed flanges at the back corners, and pairs of central stub flanges at the front and back.

REFERENCES:
patent: 670466 (1901-03-01), Bolander
patent: 2973835 (1961-03-01), Quayle
patent: 3851732 (1974-12-01), Wagner et al.
patent: 4015686 (1977-04-01), Bushnell, Jr.
patent: 4635757 (1987-01-01), Yamagishi et al.

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