A manhole lock system includes a frame positioned over an access opening, a cover movable between a closed position in which the cover extends over the access opening, and an open position in which the access opening is exposed; and a lock mechanism for locking the cover in the closed position. The lock mechanism includes a lock member that is movable along a path between a unlocked position and a locked position, wherein in the locked position the lock member prevents the cover from moving to the open position, wherein in the unlocked position the lock member is retracted to enable movement of the cover to the open position.

A cover device includes a cover plate having a body portion with inner and outer surfaces. A deployable retainer mechanism is positioned on the inner surface of the cover plate and includes a plurality of engagement features operable between retracted and deployed positions. An adjustment mechanism interconnects the deployable retainer mechanism and the cover plate, wherein the adjustment mechanism includes a portion thereof that is accessible from the outer surface of the cover plate for moving the plurality of engagement features between the retracted and deployed positions.

A system including a backfill protector including a skirt having an opening configured to receive a cover therein and a lip extending around a perimeter of the opening. The lip is configured to support the cover thereon, and the skirt further includes an inwardly-extending channel positioned adjacent to the lip.

A manhole includes a device for safely closing and locking the manhole, which has a cylinder with centering pins that is attached to a slab and is rotatable with an operating key acting on the pins, and further includes an anti-burglary block, which in locked position is positioned inside the cylinder and hides and protects an anti-theft bolt positioned inside a hole, which crosses the entire anti-burglary block and has a larger diameter at the front and the same diameter as the anti-theft bolt in the back, so as to receive the anti-theft bolt in a threaded spot in the inner wall of the cylinder and enable placement of the anti-theft bolt in the body of the anti-burglary block when totally tightened into the threaded spot, wherein the end of the anti-theft bolt, in closed position, is housed in a locking hole on a circular support of the cover.

A lockable manhole cover system including a manhole cover removably attached to a mounting ring secured to a surrounding structure such as an underground vault or concrete column, for example. A locking mechanism is attached to the bottom surface of the cover and includes a fixed end and an actuated end, each including at least one but preferably two locking pins which are movable between locked and unlocked positions. The actuated end includes a keyed lock. When in the locked position, the free ends of the locking pins extend beneath a flange extending radially inwardly on the inside surface of the ring thereby preventing the cover from being lifted up and off the ring. When the actuated side is moved to the unlocked position via the key, the locking pin free ends retract and locate radially inwardly of the flange such that the cover (and locking mechanism which is mounted thereto) is free to be lifted from the ring. On the fixed side, the locking pins are biased to move to their extended positions upon manual depression of a release stem located at the upper surface of the cover.

An access cover to underground city infrastructure, particularly a cast iron or a cast iron-concrete cover provided with a cover detection sensor connected with a radio frequency signal transmitting antenna through a transmitter, characterized in that an antenna module (1) provided with a housing made of a material neutral to electromagnetic fields, preferably made of plastic, is installed in the through channel or hole (4) with variable cross-section, and removably fixed at the bottom to a sensor module (2) located underneath the bottom of the cover (3), provided with a battery powered, low current electronic system containing a radio transmitter and an acceleration sensor or a gyroscope and an appropriate controller which detects changes to the position of cover (3) in space and in time, whereby the surface area of the sensor module (2) is greater than the surface area of the through channel or hole (4).

A closure, particularly for closing construction and technological apertures, the principle of which consists in that on the bottom side of the cover of the closing hole a rocker arm is pivotally mounted, the functional part of which in the closed position of the cover rests on the opposite element, which is anchored in the closing hole. The rocker arm is pivotally attached on a pin that is anchored by means of brackets to the bottom part of the cover. The axis of the pin, on which the rocker arm is mounted, may be either parallel to the longitudinal axis of the closing hole or perpendicular to it. The rocker arm and the rocker lug are balanced relative to the pin so that the closure is maintained in a closed position.

A system for monitoring a structures containing utility components is provided. The system includes a sensing devices, each being disposed within a structure and distributed within a geographic region, each of the sensing devices measuring parameters within the structure. A display is coupled to the sensing devices and is positioned remotely therefrom. One or more processors communicate with the sensing devices and the display. Wherein the processors perform a method comprising: receiving the measured parameters; comparing the measured parameters to thresholds; displaying on the display device elements, each device element representing one of the sensing devices, each of the device elements being geometrically arranged on the geographic distribution of the sensing devices; displaying on the display a plurality of elements, each associated with one of the device elements; and changing at least one of the elements when a measured parameter crossing one of the thresholds.

A subgrade vault system with a locking lid assembly is provided. Specifically, a subgrade vault suitable for housing utility and similar equipment is provided, the vault comprising a main body portion, a cap, and a lid that may be selectively secured with one or more rotatable locking mechanisms to prevent or deter unauthorized access to vault contents.

Described are hatch assemblies comprising a frame having sidewalls, a pivotally connected cover, and a number of easily repairable and replaceable torsion-spring-assisted hinge assemblies. Hinge assemblies may comprise a torsion spring having a coiled body along the center axis of which a carriage bolt is inserted. Once one end of the torsion spring that extends vertically from the center axis is engaged by a support member, such as a semi-open enclosure that is mounted on a hinge plate, the spring is rotated and supports the torque generated by the weight of the cover when operated by a user. Advantageously, this provides for a controlled and almost effortless opening and closing of a heavy door or covers of hatch assemblies.