Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1983-04-22
1985-02-19
Rolla, Joseph J.
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
187 81, 182 19, 182 63, 182148, 254273, 414665, 414674, B66B 920
Patent
active
044999712
ABSTRACT:
An improved system for monitoring lift chains included within mast assemblies in material handling vehicles disables downward movement of the forks upon detection of a first level of slackness in a lift chain. Since upward movement of the forks is not disabled, the forks may be raised to clear any obstruction causing the chain slackness. A lift chain may also be monitored to detect a broken chain in which case all vertical movement of the forks is disabled. In a material handling vehicle wherein the operator is elevated along a first mast and the forks are elevated along a second mast connected to an operator's platform, dual lift chains in the first mast are individually monitored for both slackness and breakage while dual lift chains in the second mast are monitored in common primarily to detect slackness. Lateral and rotational movement of the forks is also disabled for detection of a slack or broken first mast lift chain, but not for detection of a slack or broken second mast lift chain.
REFERENCES:
patent: Re24958 (1961-03-01), Ehmann
patent: 3012520 (1961-12-01), Curtis
patent: 3096896 (1963-07-01), Norton et al.
patent: 3202242 (1965-08-01), Dolphin
patent: 3241697 (1966-03-01), Rogant
patent: 3416109 (1968-12-01), Gandolfo et al.
patent: 3612221 (1971-10-01), Branham
patent: 3937346 (1976-02-01), van der Laan
patent: 3998345 (1976-12-01), Fiehler et al.
patent: 4236862 (1980-12-01), McCormick
patent: 4252491 (1981-02-01), Hock
patent: 4305513 (1981-12-01), Voelz
patent: 4366883 (1983-01-01), Reeves
Klopfleisch Kim A.
Luebrecht Donald
Crown Controls Corporation
Miller Lawrence J.
Rolla Joseph J.
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