Elevator hoistway terminal zone position checkpoint detection apparatus using a binary coding method for an emergency terminal speed limiting device
US6032761A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 27, 1998 |
| Grant date | Mar 7, 2000 |
| Priority date | — |
| Expiry date | Apr 27, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B1/50
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
An emergency terminal speed limiting device (ETSLD) uses terminal zone position checkpoint detection with a binary coding method for the sensible stationary part mounted in the terminal zone. Instead of using three separate stationary vanes of different lengths as cams for actuating three separate switches on the car as they pass by the cams, only two vanes are needed. They can be of shorter length, e.g. equal length, and overlapped in a central part of the terminal zone to create three distinct subzones to thereby create a sensible binary coded subzone indicator. The boundaries of the subzones can be used as position checkpoints. Material and manpower for installation are thereby reduced. The stationary part need not be vanes but could take other forms such as reflective tape. Likewise, the moving sensor part can be other than a cam-operated switch, such as an optical transceiver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.