Tension sensing security apparatus and method for fencing
US5371488A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 27, 1993 |
| Grant date | Dec 6, 1994 |
| Priority date | — |
| Expiry date | May 27, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/122
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The security device receives longitudinal tension from a taut wire of a fence and preferably is placed in-line in the taut wire system away from posts used to support the fence. The security device senses variations in the longitudinal tension in the taut wire and produces a tension signal which is transmitted to a central location when it senses such a tension deviation. The security device may be used in conjunction with a resistance sensing device to provide further protection. The resistance of a conductive loop formed either by the taut wire or by the combination of the taut wire and another conductor is monitored and a resistance signal is produced when it senses either a discontinuity or a variation in the resistance of the loop. The method of the present invention includes steps for receiving the tension in the taut wire and producing a signal when the tension in the taut wire varies more than a triggering amount. Further features of the present invention include anti-tampering arrangements including features that produce a tampering signal when the lid is removed from the device and when an attempt is made to clamp the device to its protective housing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.