Ultrasonic method and apparatus for automatically controlling moving doors
US6329774A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 20, 2000 |
| Grant date | Dec 11, 2001 |
| Priority date | — |
| Expiry date | Mar 20, 2020 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE05Y2900/132
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method and apparatus for automatically controlling the movement of a door over a floor from an open position to a closed position with respect to a door frame, by mounting ultrasonic transmitters at one side of the door frame and oriented to transmit ultrasonic energy downwardly towards the floor and to reflect the energy from the floor upwardly upwardly at the other side of the door frame; mounting ultrasonic receivers over the door frame at the opposite side and oriented to receive the energy from the ultrasonic transmitter reflected by the floor; and processing the reflected energy received by the ultrasonic receiver to detect the presence of an object in the path of the door, when moving toward its closed position, and to automatically interrupt the closing of the door.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.