Abstract: A hinged hatch in a gas containment cover particularly for a sewage treatment tank has a slide bolt contained within a shaped channel of an extrusion of the hatch, positioned to engage the bolt at a mid-level position of the adjacent fixed beam or other member of the tank cover. The position of the bolt enables the hinged hatch to fully seal against a rubber-covered lip of the adjacent structural member, so that the bolt latch does not compromise integrity of the gas seal. As the bolt is slid into locking position it forces the hatch cover down more tightly against the gas seal.

Abstract: A tonneau cover system clamp can include first and second clamp members with first and second clamping surfaces, respectively. The second clamp member can be slidably coupled to an elongate member relative to the first clamp member. A locking mechanism can be movable to engage the elongate member to prevent lateral translation of the second clamping surface relative to the first clamping surface in response to the first and the second clamp members being in the locked position. The locking mechanism can be movable to release the elongate member to allow lateral translation of the second clamping surface relative to the first clamping surface in response to the first and the second clamp members being in the unlocked position. A biasing member can apply a biasing force biasing the first clamp member and the second clamp member toward the proximal end of the elongate member.

Abstract: A threaded rod can be pivotably coupled to the tonneau cover via a proximal end. A housing can have first and second housing portions slidably coupled to the threaded rod and moveable along the threaded rod relative to each other between locked and unlocked positions. The second housing portion can include a channel positioned to receive a downwardly disposed distal edge of an inboard flange. Locking pawls within the housing can move to engage threads of the rod to prevent movement of the channel relative to the elongate member when in the locked position. The locking pawls can move to release the threads of the rod to allow movement of the channel relative to the rod when in the unlocked position. A biasing member can apply a biasing force biasing the housing toward the proximal end of the elongate member and biasing the housing toward the locked position.

Abstract: A metal container with a combustible liner for use as a portable firefighting training unit. The combustible liner is formed of particle board sections loosely assembled inside the metal container with an opening in the liner in registry with an access opening in the metal container. The unit may be used to demonstrate various phenomena associated with a developing fire including the flammability of unburned products of combustion, hose stream techniques with a spray bottle filled with water, flashover and backdraft.

Abstract: A flange plate closure for accessing a containment vessel has a metal base plate, having an interior and an exterior surface, at least one vertical metal tube having an open end, a metal flange ring at said open end defining an upper planar surface, and a lining made of non-corrosive material. The lining is disposed in overlying relation to the interior surface of the base plate, the interior of the tube and the upper planar surface of the flange ring. The lining is rigid, and is mechanically affixed to the metal components. The lining is made of Ultra High Molecular Weight Polyethylene.

Abstract: A latch assembly includes a housing having a cavity between first and second end walls. The housing includes first and second journal members and first and second swing arm apertures at the second end wall. A swing arm member having a joining end is positioned within the cavity having first and second swing arms connected to the joining end having portions extending freely through the first and second swing arm apertures. A keeper/catch member is rotatably connected to the first and second journal members. Keeper/catch member rotation from an orientation rotated away from a longitudinal axis defined by a portion of the first and second swing arms extending through the swing arm apertures to an orientation approximately parallel with the longitudinal axis creates an over-center locking condition for the housing and a pushing force acting through the keeper/catch member to push a first component into contact with a second component.

Abstract: A locking assembly for a ballast housing simply and easily locks a lid to a body of the housing. The body has a first base and a first wall extending upwardly from the first base. The lid has a second base and a second wall extending downwardly from the second base. A tab extends outwardly from the first wall. A fastener is pivotally disposed in an opening in the tab, and has a head adapted to receive a rotating device. A third base extends outwardly from the second wall. A slot in the third base is adapted to receive the fastener. A nut is threadably disposed on the fastener and the fastener is rotatable through the nut to engage the fastener head with the tab and to engage the nut with the base to tightly secure the lid to the body.

Abstract: A portable computer and base member arrangement having a base member and a portable computer is disclosed. The base member has two stop flanges protruded upwardly from the top face in two rear corners and adapted to engage two recessed locating holes of the portable computer after attachment of the portable computer to the base member, and a swinging retainer plate fastened pivotally with the front side and provided with two retaining rods adapted to engage into corresponding retaining holes in the front peripheral side of the portable computer to lock the portable computer to the base member after engagement between the recessed locating holes with protruded retaining portions of the stop flanges of the base member.

Abstract: A computer case with side panel clip fastening configuration utilizing a direct clip fastening method to quickly secure side panels of a computer case to a computer case housing. An inner catch first lodges into a notch defined on the side panel, and subsequently rotated 90° therein to secure its positioning. The configuration further employs a cylindrical positioning socket configured on the clip fasteners to pass through through-holes defined in the side panels and thereupon into securing holes defined in the computer case housing. The side panels and computer case housing are thereby assembled to form a computer case in its entirety.

Abstract: A manway assembly (10) designed for mounting within an opening (19) in a vessel wall (20) is provided which includes a manway ring (12) having a passageway (24) therethrough, with an inner cover (14) and a cover lock (18). The cover (14) is supported by a swing mount (16) including a tubular member (42), an arm (44) telescopically received within member (42), and a suspension connector (48). The lock (18) is made up of studs (38) secured to cover (14) and extending through passageway (22), with an annular locking plate (50) having bores (54) for receiving the studs (38); nuts (64) complete the locking arrangement.

Abstract: A manway assembly (10) designed for mounting within an opening (19) in a vessel wall (20) is provided which includes a manway ring (12) having a passageway (24) therethrough, with an inner cover (14) and a cover lock (18). The cover (14) is supported by a swing mount (16) including a tubular member (42), an arm (44) telescopically received within member (42), and a suspension connector (48). The lock (18) is made up of studs (38) secured to cover (14) and extending through passageway (22), with an annular locking plate (50) having bores (54) for receiving the studs (38); nuts (64) complete the locking arrangement.

Abstract: A high temperature industrial door having a flexible door plate with notches about the periphery thereof for receipt of swing bolts. The door plate includes interior insulation and is suspended from and hinged to a door frame using a davit assembly. In the closed position, the lower edge of the door extends below floor level. To open the door, the davit assembly allows the door to be lifted above floor level and moved to an open position, by pivoting of the davit assembly.