Inventors:
Gary S. Mosholder - Sykesville MD, US
Thomas Zuby - Linthicum MD, US
Assignee:
The United States of America as represented by the Director, The National Security Agency - Washington DC
International Classification:
E06B 11/00
Abstract:
An enhanced security manhole cover is disclosed, comprising a frame, outer cover, inner cover, crossbar, saddle, eyebolt, and padlock. The inner cover, which closes the lower opening in a manhole, includes a detent in the top surface for receiving the eyebolt. The crossbar is positioned above the inner cover and engages the walls of the frame. The crossbar includes a threaded hole that aligns with the detent. The saddle, an upside down U-shaped member, is positioned over the crossbar and includes a slot for the eyebolt to partially extend through. The saddle may include a shoulder on the base, to protect the eyebolt. The eyebolt passes partially through the saddle and crossbar and threads into the bore. The shackle of the padlock passes through holes in the upright of the U-shaped saddle below the crossbar, locking the saddle in place. The upper cover closes the top of the frame.