Dual mast apparatus for storage and retrieval vehicles

Details Dual mast apparatus for storage and retrieval vehicles Dual mast apparatus for storage and retrieval vehicles

1991-04-12

1992-09-22

Huppert, Michael S.

Material or article handling

Plural, static structures for supporting discrete loads and...

Load-underlying members

187 859, 187 11, 254DIG9, 414282, B65G 100

Patent

active

051492415

ABSTRACT:
A novel dual mast storage and retrieval vehicle comprising structure which maintains each mast essentially vertical as variably weighted heavy loads are placed on a carriage disposed between the masts. Each mast is disposed near the center of a separately supported base such that bending of the base under such loads induces little off-vertical deflection to the mast. The separately supported bases are coupled by a connector which comprises cross-aisle and vertical degrees of freedom but is strictly constrained in the down-aisle direction. In the currently preferred embodiment, two down-aisle drive motors, in master/slave relationship, provide a synchronous drive for the vehicle. Further, interconnecting joints a strut at the top of the masts and of the carriage comprise hinges which resist propagation of mast induced moments caused by beam deflection or vehicle dynamics. The invention comprises a lift cable vertical drive assembly wherein a motor is horizontally disposed down-aisle in line with a lift cable winding and unwinding drum. The vertical drive assembly is modularly assembled on a frame and is attachable and detachable from the vehicle as a unit. The vertical drive assembly comprises, in seriatim, the motor, a belt drive sprocket wheel, a drive belt, a belt driven sprocket wheel, and, juxtaposed and on the same axis as the driven sprocket wheel, an input adapter, a speed reducer, and a two lift cable drum. The motor is attached to the frame by jacks used to raise and lower the motor to adjust tension in the belt.

REFERENCES:
patent: 3556266 (1971-01-01), McCarthy
patent: 3770147 (1973-11-01), Kito et al.
patent: 3887038 (1975-06-01), Buschbom et al.
patent: 3993202 (1976-11-01), Neitzel
patent: 4331418 (1982-05-01), Klebe
patent: 4466765 (1984-08-01), Mautino
patent: 4509620 (1985-04-01), Verbos
patent: 5020957 (1991-06-01), Liston

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