Abstract: A telescoping mast assembly for floodlighting equipment or other apparatus is arranged to be raised by admitting pressurized fluid to the interior of the assembly and lowered by releasing the fluid. The assembly is constructed of light metal, such as aluminum alloy, and includes a plurality of telescoping hollow members, or tubes, each inner member having a pair of substantially spaced wear rings near its lower end for maintaining the spaced positions of the members and a fitting at its outer end carrying an internally mounted wear ring for maintaining the spacing at the outer end. The telescoping members do not engage one another but are spaced by the wear rings. The fitting is readily detachable and facilitates the use of straight lengths of standard aluminum tube stock for the mast sections. The fittings include keys slidably engaging longitudinal slots in the members for preventing rotation of the members with respect to one another. Seals are provided for preventing leakage of fluid between the members.

Abstract: A portable floodlighting unit of the type having an extensible mast mounted on a vehicular body for transportation and collapsible into a horizontal position on the body is provided with two collapsible masts at diagonally opposite corners of the vehicle. East mast is provided with a frame carrying a battery of floodlights. Floodlighting at high intensity on all sides of the vehicle is made possible, and if desired all the lights may be positioned to light an area at one side of the vehicle.

Abstract: A portable electric sign display unit comprises a wheeled trailer having a main frame on which is mounted a motor-generator unit and a structure for holding a warning sign or the like in an elevated position. The sign carrying structure is collapsible into a position in which a central portion of the sign panel forms a roof over the motor-generator unit and two hinged side panels form the sides of the cover for the unit. The sign is erected by operation of a winch which first rotates the sign panel toward its vertical position and then raises the structure a further distance to the fully elevated position. The side panels are locked into position in the same plane as the central portion and electric lights forming the display are mounted on all three portions.

Abstract: A pavement cutting wheel assembly is arranged to be secured to the earth engaging tool of a motorized earth moving vehicle by a clamping device, and an element of the clamping device is arranged to use the force on the cutting wheel during its cutting operation to increase the clamping effort of the clamping device.