Apparatus and method of thermally detecting elevator machine bra

Details Apparatus and method of thermally detecting elevator machine bra Apparatus and method of thermally detecting elevator machine bra

1997-12-23

2000-08-01

Oberleitner, Robert J.

Brakes

With condition indicator

Electrical

188 111R, F16D 6600

Patent

active

06095289&

ABSTRACT:
An apparatus and method are provided for detecting brake drag of an elevator machine brake (30). Temperature sensors (44) are disposed in close proximity to a pair of brake pads (35,36) and compared to ambient temperature to determine whether the brake pads are dragging on a rotating brake drum (37). A comparison circuit (47) is used to determine if the temperature of the brake pads has exceeded a predetermined threshold level (55) and to produce an output signal (52) corresponding to the position of the brake pads.

REFERENCES:
patent: 4674326 (1987-06-01), Reinecke
patent: 5060890 (1991-10-01), Utterback et al.
patent: 5149025 (1992-09-01), Utterback et al.
patent: 5419415 (1995-05-01), Lamb et al.
patent: 5651431 (1997-07-01), Kyrtsos
patent: 5742920 (1998-04-01), Cannuscio et al.

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