Escalator drive mechanism with failure detection and backup

Details Escalator drive mechanism with failure detection and backup Escalator drive mechanism with failure detection and backup

2006-02-14

2006-02-14

Bidwell, James R. (Department: 3651)

Conveyors: power-driven

Conveyor or accessory therefor specialized to convey people

By stairway having steps forming an endless member

C198S323000

Reexamination Certificate

active

06997302

ABSTRACT:
An escalator drive assembly includes a backup member (40) that facilitates controlling movement of the escalator (20) even when the normal drive assembly operation is interrupted. A backup member (40) in the form of a flange (42) is associated with a drive pulley (34) and normally rotates in unison with the drive pulley (34). When there is a failure in the normal operation of the drive mechanism, however, there is a resulting relative movement between the backup member (40) and the drive pulley (34). Such relative motion preferably activates a switch (80) that provides a signal that indicates a failure of the normal operation of the drive mechanism. The backup member (40) facilitates providing an indication of a failure and control over movement of the escalator (20) even when the normal drive assembly is not operating as intended.

REFERENCES:
patent: 5024314 (1991-06-01), Kitamura et al.
patent: 5090551 (1992-02-01), Yasuhara et al.
patent: 6234295 (2001-05-01), Ogawa
patent: 6427823 (2002-08-01), Ishikawa et al.
patent: 6457573 (2002-10-01), Ostermeier et al.
patent: 6527099 (2003-03-01), Ostermeier et al.
PCT International Search Report dated Mar. 26, 2003.

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