Control device for overhead conveyors

Details Control device for overhead conveyors Control device for overhead conveyors

2005-01-04

2005-01-04

Bidwell, James R. (Department: 3651)

Conveyors: power-driven

With alarm or indicator

C198S502400, C212S285000

Reexamination Certificate

active

06837363

ABSTRACT:
A control device for overhead conveyors equipped with at least two actuators (6, 7), specifically crane and crane trolley drive units, with transmission of control signals and transmission of safety signals from control unit (10) to actuators (6, 7) via a signal connection, with a control unit (10) exhibiting a safety switch unit emitting at least one safety signal, which can be triggered manually in order to shut down at least one actuator (6, 7). In order to specify a simple control device ensuring a conveyor's increased operational safety, it is suggested that a signal connection feature serial bi-directional data bus (11) used for signal transmission between control unit (10) and actuators (6, 7), which are therefore equipped with the pertinent controls (12, 13), each operating jointly with a corresponding safety control (14, 15), monitoring independently from each other all of the safety signals transmitted via data bus (11) and emitting at least one shut-down command to at least one of controls (12, 13), when at least one predetermined incident has occurred.

REFERENCES:
patent: 5749454 (1998-05-01), Layne
patent: 6439370 (2002-08-01), Hoffman et al.
patent: 6446788 (2002-09-01), Leidy et al.
patent: 6508353 (2003-01-01), Edstrom
patent: 3706325 (1988-09-01), None
patent: 4108347 (1992-09-01), None
patent: 547280 (1993-06-01), None
patent: 0592795 (1993-08-01), None
patent: 592795 (1994-04-01), None
European Search Report dated Oct. 13, 2003, from corresponding Patent Application Ser. No. EP 03014636.9.

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