Speed governor safety device for stopping an elevator car
US5065845A · kind A · utility
Inventor
Key dates
| Filing date | Sep 13, 1990 |
| Grant date | Nov 19, 1991 |
| Priority date | — |
| Expiry date | Sep 13, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B5/044
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A safety apparatus includes a safety device and a centrifugal force speed governor for preventing overspeed conditions of an elevator car in both the downward direction and the upward direction. A bracket attached to the elevator car slidably retains a shaft at right angle to a guide rail attached to an elevator shaft wall. A U-shaped frame is attached to an end of the shaft and rotatably carries a running wheel. A compression spring extends over the shaft between the bracket and the frame to bias the running wheel against the web of the guide rail. On each side of the running wheel, a pair of release levers are rotatably supported to rotate during travel of the car in normal operation. In response to an overspeed condition, the release levers pivot into engagement with a pair of stationary ratchet wheels which are connected with a pair of actuating levers. The ratchet wheels are rotated by the running wheel which movement rotates the actuating levers. The actuating levers each move a release arm and one of the levers is connected to an actuating rod, which in turn is in connected to a release arm of another safety device on the car. The release arms extend into a wedge box of the …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.