Permanent magnet, magnetodynamic safety brake for elevators and the like
US5467850A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 16, 1993 |
| Grant date | Nov 21, 1995 |
| Priority date | — |
| Expiry date | Dec 16, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B5/16
- WIPO fieldHandling
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.