Storage and retrieval machine with spring tensioned shuttle pull

Details Storage and retrieval machine with spring tensioned shuttle pull Storage and retrieval machine with spring tensioned shuttle pull

1996-03-28

1998-09-29

Keenan, James W.

Material or article handling

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

Load-underlying members

414282, 414661, B66F 907

Patent

active

058138161

ABSTRACT:
A storage and retrieval machine has a telescopically extendible shuttle assembly and having spring tensioned shuttle idler pulleys for the slave drive members, preferably chains, of the shuttle assembly. A spring, preferably a die spring, exerts a biasing force on each idler pulley which opposes forces imposed on the idler pulley by the corresponding slave chain. Pre-tensioning the idler pulley in this manner assures adequate tension on the slave chain to prevent or at least inhibit undulations in plate movement which otherwise could occur during telescopic extension and retraction of the shuttle assembly if the slave chain were inadequately tensioned. Use of the spring loaded idler pulley also obviates the need to over-tension the slave chain and prevents or inhibits premature wear and failure of the idler pulley, pulley bearing, and/or chain.

REFERENCES:
patent: 2801731 (1957-08-01), York
patent: 4388033 (1983-06-01), Pipes
patent: 4458808 (1984-07-01), Loomer
patent: 4820109 (1989-04-01), Witt
patent: 4988262 (1991-01-01), Gines
patent: 5015140 (1991-05-01), Kling
patent: 5207555 (1993-05-01), Shirai
patent: 5275064 (1994-01-01), Hobbs
patent: 5397211 (1995-03-01), Lloyd et al.
patent: 5405232 (1995-04-01), Lloyd et al.
patent: 5460475 (1995-10-01), Lloyd et al.

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