Multi-stage mast for a forklift truck

Details Multi-stage mast for a forklift truck Multi-stage mast for a forklift truck

1992-07-29

1994-07-12

Huppert, Michael S.

Material or article handling

Elevator or hoist and loading or unloading means therefor

Elevator wherein means comprises guide mounted for relative...

414635, 414637, 414663, 187 9E, B66F 908

Patent

active

053283210

ABSTRACT:
A three-stage mast (1) for a forklift truck and a forklift truck incorporating the mast (1). The mast (1) has an outer mast section (2) for mounting on the truck. A middle mast section (5) is slidably movable on the outer mast section (2) by rams (7). An inner mast section (12) is slidably mounted on the middle mast section (5) and carries a fork carriage (14). Lifting chains (20) and lowering chains (30) extend between the inner mast section (12) and outer mast section (2) passing over intermediate guides (24, 31) on the middle mast section (5). The chains (20, 30) raise and lower the inner mast section (12) on the middle mast section (5) when the rams (7) are operated. Similarly lifting chains (26) and lowering chains (34) extend between the middle mast section (5) and the fork carriage (14) via guides (27, 35) on the inner mast section (12) for movement of the fork carriage (14) on the inner mast section (12). The fork carriage (14) has a frame bracket (51) with a tine support member (52) rotatably mounted on the frame (51).

REFERENCES:
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patent: 3930563 (1976-01-01), Abels
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patent: 3998345 (1976-12-01), Fiehler et al.
patent: 4051970 (1977-10-01), Ramsey
patent: 4675827 (1987-06-01), Narita
patent: 4762203 (1988-08-01), Ryan
patent: 4921075 (1990-05-01), Schumacher et al.
patent: 5036952 (1991-08-01), Harper

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