Permanent magnet, magnetodynamic safety brake for elevators and

Details Permanent magnet, magnetodynamic safety brake for elevators and Permanent magnet, magnetodynamic safety brake for elevators and

Filed on

1993-12-16

Date issued

1995-11-21

Examiner

Oberleitner, Robert J.

Patent Class

Brakes

SubClass

Operators

SubSubClass

Electric

Other Related Categories

187373, B60L 728

Type

Patent

Status

active

Patent number

054678501

Description

ABSTRACT:
A safety brake (14) for an elevator (or other) car has a plurality of permanent magnets (21, 23) arranged along the car guide rail (13) with alternate magnets disposed with opposite polar orientation so as to provide loops of flux (23) between the magnets and in the guide rail when the brake is actuated. A pawl (27) engages a latch (30) to retain the brake lifted when not in use; a governor operated safety rod (34) rotates the pawl to disengage the latch for actuation of the brake in an emergency. Guides (55-59) stabilize the brake against the braking forces. A jack screw (49) overcomes attractive magnetic forces to reset the brake into the lifted position.

REFERENCES:
patent: 3488535 (1970-01-01), Baermann
patent: 3799298 (1974-03-01), Loomer
patent: 4482034 (1984-11-01), Baermann
patent: 5018605 (1991-05-01), Hooghiem et al.
patent: 5140208 (1992-08-01), Tozoni
patent: 5301773 (1994-04-01), Jamieson et al.
"Eddy Current Brake WSB", Knorr-Bremse GmbH, 1975.

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