Elevator drive brake device monitor
US8016081B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 16, 2008 |
| Grant date | Sep 13, 2011 |
| Priority date | — |
| Expiry date | Mar 25, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49826
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An elevator drive with a brake device has compression springs that act on brake levers, whereby brake linings generate a brake force on a brake drum. The more the brake linings wear due to abrasion, the smaller the distance of the plunger from the brake magnet housing becomes. Should the plunger come into contact with the brake magnet housing, the braking capacity of the brake linings is completely eliminated creating an operating condition that is dangerous for elevator users. A switch is provided that detects a minimum distance. The switch can be arranged on the plunger of the brake magnet and detect the minimum distance to the brake magnet housing or, in the case of a retrofit, the switch can be arranged on the brake magnet rod and, for example, detect the distance of the second joint from the brake magnet housing, and at the minimum distance the switch switches.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.