Abstract: A lighting fixture housing includes two end caps, a reflector assembly, and a ballast box cover. The two end caps further include top and bottom flanges and mounting brackets having support tabs extending thereon. The lighting fixture housing is installed by first sliding the end caps into position at opposite ends of an opening in a suspended ceiling formed of a T-bar grid, and then attaching the reflector assembly to the end caps. The reflector assembly may be temporarily suspended from the end caps so that electrical connections to the assembly are made and the ballast box cover installed.

Abstract: A flexor connector drive system for mechanical flexors of a modular causeway system includes a linear slide mechanism coupled to a linear drive located within a well on a first section of the causeway system. The linear slide mechanism is adapted to be driven out of the well by the linear drive and couple to a flexor located within a well on a second section of the causeway. Upon reversal of the linear drive, the linear slide mechanism pulls the flexor into the well on the first section, for interconnecting the two sections. The linear drive includes a high helix screw that provides high torque under high speed conditions for quickly moving the heavy flexor between the two sections.

Abstract: A mine scaling vehicle for use in removing loose materials from the roof and walls of underground mines includes an articulated frame with a turntable mounted on a forward portion of the frame and a drive system mounted on the back portion of the frame. The turntable rotatably supports an operators cab and a boom carrying a scaling pick, with the operators cab being located centered rearwardly of the boom to provide improved scaling visability for the operator. The drive system and a hydraulic control system of the mine scaling vehicle are mounted on the frame located below a plane of the turntable to provide a low center of gravity of the mine scaling vehicle.

Abstract: A battery-powered vehicle for transporting a mined payload or supplies over the roadways existing in or around an underground mine, includes variable voltage, variable frequency drivers that convert DC voltage from a battery into an AC voltage for driving AC induction motors of a front wheel drive system of the vehicle, and a further variable frequency driver that converts DC voltage from the battery into an AC voltage for driving an AC pump motor for supplying hydraulic fluid to hydraulically operated components of the vehicle. A controller controls the operation of the variable voltage variable frequency drivers in response to commands supplied to the controller by an operator of the vehicle.