An access door assembly provides a removable covering for an access opening in a wall panel. The assembly includes clip members frictionally mounted to the wall panel at spaced locations around the periphery of the access opening. A door overlies the opening and is dimensioned to cover the clip members as well as the opening. Spring-clip fastening elements releasably secure the door to the clip members and hold the door in position over the opening in the wall panel.

Access equipment for fire fighting purposes including an articulated boom structure having two booms, the structure being mounted on a turntable attached to a vehicle, each boom having ladder means extending along its length, a further ladder being telescopically extendible from either end selectively of the outermost boom of the boom structure to extend the reach of the equipment for any operative position of the booms.

An access union is disclosed which is especially useful for installation on containers for fluids to permit access thereto. The invention is also concerned with containers for fluids having the access union of the invention installed thereon. When installed on containers for fluids, the access union of the invention provides for permanency of the installation when desired, and also allows future changes and modifications to be made easily and without damaging the access union and/or an access co...

Apparatus enabling access to the interior surfaces bounding a large spaced comprises a pole adapted to extend vertically through the height of the space with its lower end located at the base of the space, at least one boom structure connected with said pole, a working platform connected to the end of said boom structure remote from said pole and the height of said boom structure is adjustable relative to said pole.

Access equipment of the kind comprising a boom assembly pivotally attached at one end to a supporting structure and having a cage or working platform at its other end, the boom assembly being movable relative to the supporting structure to raise the cage or platform to an elevated working position, and comprising at least one stretcher supporting member removably attached to a corner of the cage or platform and rotatable thereon thus to receive a stretcher from any direction without angular adju...

Access equipment having an articulated boom structure comprising two or more booms pivoted end to end, the lowermost boom being pivotally mounted on a supporting structure such as a vehicle, the boom structure being movable between a stowed position wherein said boom are located adjacent the supporting structure and a working position wherein the free end of the boom structure is raised to an elevated position above the supporting structure, characterised by the provision of a ladder extending a...

A patching module having an improved switching and monitor feature for use in a patch unit assembly. The monitor feature includes a monitor plug with monitor elements capable of directly monitoring selected leads of the circuit within the module without drawing any power from such circuit. Each module is provided with appropriate connections for an independent power source.

An accessory for converting a crane of the kind having a telescopically extendible jib pivotally connected to a turntable into access equipment comprising a unit to be fitted to the free end of the jib of the crane, a bracket member pivotally connected to said unit for rotation about a horizontal axis, first hydraulic cylinder means extending between said unit and the bracket and capable of being actuated to adjust the orientation of said bracket relative to the jib of the crane, a boom structur...

An access door primarily designed to provide an insulated entrance to heating, ventilating and air conditoning ducts consisting of a two-pan structure lockably connected together by a simple unfastening means.

An access door for installation in a rough opening formed in a building ceiling or wall including an outer framework having an opening adapted to be fitted in the rough opening and secured to the ceiling or wall, a cover for opening and closing the opening in the outer framework, and link hinges for pivotally connecting the cover to the outer framework, whereby when the cover is released, the cover has imparted a vertical descent movement thereto. Rapid opening and closing pivotal movement of th...