Abstract: A system and method for ventilating a utility structure enclosed by a vented cover is provided. The system includes at least one air movement device coupled to the cover. A first induction loop is electrically coupled to the at least one air movement device, the first induction loop being coupled to the cover. A second induction loop is disposed in the utility structure, the second induction loop being inductively coupled to the first induction loop. A gas sensor is operably coupled to the second induction loop to direct electrical power to the second induction loop in response to a gas level being equal to or exceeding a predetermined threshold.

Abstract: A shroud that includes a body, a cavity, a curved outlet, and at least one non-linear channel. The body can have a top end and a bottom surface, as well as a first end and a second end located opposite the first end. The cavity can be located under the top end of the body and disposed toward the first end. The curved outlet can be disposed toward the second end of the body and have a banana-shaped vent that traverses at least two sides of the body. Each linear channel can include a bent passage, a third end, and a fourth end, where the third end adjoins the cavity, and where the fourth end adjoins a portion of the banana-shaped vent of the curved outlet. The curved outlet and the at least one non-linear channel can prevent substantially all liquids and solids outside the body from entering the cavity.

Abstract: There is provided is a blower installed at a manhole opening, with which it is possible to facilitate an entry or an exit of a worker or an import or an export of an article. The present invention provides a ventilation system in a pipe conduit using the blower. Provided is a blower comprising: a ring-like or circular arc-like frame; a nozzle installed continuously or discontinuously along the frame; and compressed air supplying means for supplying the nozzle with compressed air, wherein the compressed air supplied from the compressed air supplying means is emitted while swallowing up air in the nozzle or near the nozzle, whereby, an airflow to a normal direction of a disk surface of which the flame is periphery is generated. The nozzle may be a nozzle for exhausting an air flown from an entry port of a cylindrical flow channel to an exit port of the cylindrical flow channel, and a plurality of the nozzles may be discontinuously installed along the frame.

Abstract: A lid-lift hole assembly for an underground utility vault lid comprises a liner positioned in an open-ended lid-lift hole, and a receptacle positioned below the liner. Opposite side walls of the receptacle contain thru-holes aligned with fastener holes in opposite side walls of the liner, Fasteners extending through the thru-holes and into the fastener holes (from the underside of the lid) are tightened (to apply pressure to the juncture between the receptacle and the liner) to lock the liner in the lid-lift hole. The receptacle forms an enlarged-volume, box-like enclosure rigidly (but releasably) held beneath an open passage through the liner. The space inside the receptacle can contain debris kept from entering the working area of the vault. The space inside the receptacle is shaped to receive a tool for removing the lid.

Abstract: A cover for a structure may include a plate including upper and lower surfaces. A rim portion of the lower surface may be configured to contact an edge of the structure. The cover may include a spider including a center portion, a plurality of legs extending radially outward from the center portion, and a plurality of coupling elements. Each leg may be coupled to the lower surface of the plate with a corresponding coupling element. The center portion of the spider may be movable away from the lower surface of the plate to move the spider from a locked position in which a distal end of each leg extends outward to a first radial position to engage the structure to an open position in which the distal end of each leg is withdrawn to a second radial position radially inward of the first radial position to disengage the structure.

Abstract: A one-piece, unitary manhole cover has dual lifting ports that drain through the outer circumferential edge of the cover. A lifting channel runs from the interior of the upper face out to the outer circumferential edge. A lifting bar spans the lifting channel and defines an ergo lifting port and a pry bar lifting port. Both the ergo lifting port and the pry bar lifting port drain through the outer circumference of the manhole cover.

Abstract: A security grill for a security institution has an air inlet face, an air outlet face, and zigzag channels extending from a point adjacent the inlet face toward the outlet face. The zigzag channels are defined by slats which are bent at least twice in alternating directions. The zigzag channels are divided into segments each having a cross-sectional width. The segments adjacent the air outlet face have a cross-sectional width less than any of the other segments along the channel. The slats are bent at certain angles which are larger than those of conventional security grills. Corners are created along each slat as a result of bending the slats in alternating directions. The corners are rounded.

Abstract: A security module for use with a ventilation grating comprising a body, a base with a planar surface for attachment to the grating, and an outer wall extending from the base. The body has inner passageways extending from the base to the outer wall, the first portion of which extends from the base in a direction perpendicular to the base, and the second portion of which extends from the outer wall to intersect perpendicularly with the first portion within the body. The security module, when attached to a ventilation grating, prevents threading a rope-like material, through the grating, and using the make-shift rope to commit suicide by hanging, and is therefore particularly suitable for use in penal institutions, hospitals and mental health facilities.

Abstract: A security module for use with a ventilation grating comprising a body, said body having a base with a planar surface and an outer wall extending from said base, said body further including an inner passageway extending from said base to said outer wall, said passageway having a first portion extending from said base in a first axial direction perpendicular to said base, and a second portion extending from said outer wall in a second axial direction to intersect said first portion within said body, said first and second axial directions being perpendicular with respect to each other. Said security module, when affixed to a ventilation grating of a ventilation system, prevents threading a rope-like material, through the ventilation grating, and using the make-shift rope to commit suicide by hanging. Said security module is particularly suitable for use in penal institutions, such as jails, prisons and penitentiaries, as well as in hospitals and mental health facilities.

Abstract: A template for temporary placement on the open upper end of a below-ground structure, including a rectangular body matching key dimensions of a permanent ground-level member to be installed, the body having an open bottom to engage the open upper end of the below-ground structure, a raised top surface, a back road-edge portion on one side of the body, and upright sidewalls. A method for using the template to facilitate adjustment of positioning of below-ground structures on which permanent ground-level members will be installed, the method involving placing, removing and re-placing the template while determining and adjusting positioning of the below-ground structure.

Abstract: An expanding and retractably collapsing device includes a generally cylindrical hose which is expandable and retractably collapsible and has formed on a surface thereof a circumferentially extending rib. A roller assembly having rotatable framework is disposed adjacent the hose and has roller bearings disposed in the framework for mechanically engaging the rib such that rotation of the framework in one or another direction causes either expanding or collapsing the hose. The roller assembly is generally axially stationary with respect to an axis about which the hose expands and contracts. An air supply unit is connected to the hose to deliver conditioned air. A remote controller enables operation of the air supply unit and includes a detector for detecting toxic air conditions and generating an alert signal indicating an unsuitable environmental condition.

Abstract: Assemblies and methods are provided to divert liquids that would otherwise infiltrate utility manholes or other hatchways, while allowing gases to vent to the atmosphere. Preferred embodiments of the assemblies comprise a cover support frame, a sheet of water-repellent gas-permeable material occluding the central opening of the support frame and a cover mated to the frame. Preferably, a stiffening ring or other means of providing structural rigidity to the venting structure is provided. The assemblies are lightweight and are simple to install, and can be fabricated from materials that are readily available. Moreover, the assemblies can be easily modified to accommodate field conditions.

Abstract: Assemblies and methods are provided to divert liquids that would otherwise infiltrate utility manholes or other hatchways, while allowing gases to vent to the atmosphere. Preferred embodiments of the assemblies comprise a cover support frame, a sheet of water-repellent gas-permable material occluding the central opening of the support frame and a cover mated to the frame. Preferably, a stiffening ring or other means of providing structural rigidity to the venting structure is provided. The assemblies are lightweight and are simple to install, and can be fabricated from materials that are readily available. Moreover, the assemblies can be easily modified to accommodate field conditions.

Abstract: The present invention relates to a device for use in a manhole or similar structure, whereby the device is designed to filter contaminate gas typically found in such structure. More particularly, the device includes a canister member filled with filtration media, a skirt member designed to direct contaminate gases towards the canister, and a support member for holding the canister in place.

Abstract: An apparatus for evacuating sewer gas from a city sewer system comprises a frame that can be inserted into a manhole and supported by the surface surrounding the manhole, a gasoline engine carried by the frame, and a fan turned by the engine shaft so that it draws air upwards from the sewer through ventholes formed in the frame.

Abstract: A security vent, providing a housing assembly mounted to a support, the housing assembly including a side wall portion having first and second distal ends thereof and defining a passageway therebetween; a drawer assembly having a filter-receiving slot therein, the drawer assembly being slidingly received by the housing assembly second distal end, the drawer assembly being moveable within the housing assembly passageway between an open position and a closed position, wherein the filter-receiving slot is disposed within the housing assembly when the drawer assembly is in the closed position, and wherein the filter-receiving slot is in communication with a region outside the housing support when the drawer assembly is in the open position; and, a latch assembly mounted to the housing assembly, the latch assembly being moveable between a locked position and an unlocked position, the latch assembly being received by a latch-receiving notch provided in the drawer assembly when the drawer assembly is in the closed p

Abstract: An apparatus for mounting a portable ventilation fan at an access port in the wall of an enclosure. The apparatus comprises a fixable base plate having a first opening extending therethrough, and which is detachably mounted to the port with the first opening in alignment with the port opening. A swing plate having a second opening extending therethrough is pivotably coupled to the base plate for pivotal movement between a closed position in which the first and second openings are aligned and an open position. The fan is detachably coupled to the swing plate so that the fan is in alignment with the second opening, whereupon when the swing plate is in the closed position, the fan is operable to promote a flow of air through the access port via the first and second openings.

Abstract: A heat venting system for subterranean transformer enclosures for sidewalks or streets includes a vent guard that passes air but prevents solids and fluids such as destructive oil from dropping upon the transformers. Used in connection with a vent plate having very many small holes will prevent leaves and sticks from clogging the vent and destroying the transformers.

Abstract: A security vent, providing a housing assembly mounted to a support, the housing assembly including a side wall portion having first and second distal ends thereof and defining a passageway therebetween; a drawer assembly having a filter-receiving slot therein, the drawer assembly being slidingly received by the housing assembly second distal end, the drawer assembly being moveable within the housing assembly passageway between an open position and a closed position, wherein the filter-receiving slot is disposed within the housing assembly when the drawer assembly is in the closed position, and wherein the filter-receiving slot is in communication with a region outside the housing support when the drawer assembly is in the open position; and, a latch assembly mounted to the housing assembly, the latch assembly being moveable between a locked position and an unlocked position, the latch assembly being received by a latch-receiving notch provided in the drawer assembly when the drawer assembly is in the closed p