Braking device for an elevator
US5363942A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 6, 1993 |
| Grant date | Nov 15, 1994 |
| Priority date | — |
| Expiry date | Jul 6, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B5/22
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A braking device for an elevator, wherein a cage moves along a guide rail. The braking device includes a wedge braking device a speed governor and a linking mechanism. The wedge braking device includes a resilient support member, a pair of wedge guides provided inside the resilient support member and a pair of wedges. Each wedge is provided between the guide rail and the wedge guides. The wedges are pressed against the guide rail by the wedge guides by biasing force generated by the resilient support member, thereby stopping the cage by a first frictional force resulted between the guide rail and the wedges. The wedge braking device further includes a releasing mechanism for releasing the resilient support member such that the wedges separate from the guide rail when releasing force is generated. The linking mechanism is linked such that the speed governor pulls up the wedges along the wedge guide when the speed governor detects that a speed of the cage is larger than a rated speed, thereby pressing the wedges against the guide rail and effecting emergency stop of the cage by a second frictional force resulted between the guide rail and the wedges.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.