Wireless safety chain for elevator system
US6467585B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 5, 2001 |
| Grant date | Oct 22, 2002 |
| Priority date | — |
| Expiry date | Jul 5, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B13/22
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A wireless safety chain for an elevator system includes a base transceiver connected to a system controller. A plurality of safety chain components each includes a physical sensor such as a switch, and a wireless transceiver. The physical sensor monitors the component status. The wireless transceiver communicates among the other safety chain components and the system controller. The wireless safety chain preferably employs a token scheme, where a token is sent from the base transceiver to one component, which in turn sends the token to another component, and so on, until the token returns to the base transceiver. Failure of the token to return to the base transceiver in a predetermined amount of time signals that the elevator system is unsafe.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.