Patent ID: 9127431
Filing Date: 2015-09-08
Classification: E02D,E05F

Abstract:
1. A manhole security cover for covering an opening to a manhole, comprising: a manhole cover body comprising a non-metallic RF signal transmissive material; said manhole cover body having a generally planar first side, a second side spaced from said first side and a peripheral edge portion; said manhole cover body being operatively positionable during use thereof to seat on a manhole frame and cover said manhole opening, such that said first side of said manhole cover body is accessible from outside said manhole, said second side of said manhole cover body is disposed within said manhole, and said peripheral edge portion of said manhole cover body engages a manhole cover support surface on said manhole frame; a manhole cover tamper sensor responsive to a predetermined movement of said manhole security cover body; a transmitter operatively connected to said manhole cover tamper sensor and configured to generate a radio frequency manhole cover tamper signal when said manhole cover tamper sensor detects said predetermined movement of said manhole security cover body; an antenna operatively coupled to said transmitter to radiate radio frequency energy through said manhole cover body to a receiver located outside of said manhole; and said transmitter, said antenna and said tamper sensor being enclosed within a single transmitter/antenna/sensor (TAS) unit on said second side of said manhole cover body.