Abstract: An improved task light is comprised of a housing having a center cavity portion, a light passage opening below the center cavity portion, and an edge cavity for supporting a light source that emits light from the housing's edge cavity portion into its center cavity portion. A reflector, at least a portion of which spans the center cavity portion of the housing and which portion has a proximal and distal edge in relation to the light source, lies along a path that curves inwardly of the housing such that, when the reflector is viewed through the housing's light passage opening from the level of a task surface below the task light and from any position to the front of the task light, the luminance of the spanning portion of the reflector from reflected source light is substantially uniform over substantially the entirety of the spanning portion of the reflector.

Abstract: A cane for use by a visually handicapped person which has a tip at its bottom end which has a relatively broad outwardly facing convex contact surface. When slid along the ground as the person walks, the cane tip, which is preferably a hollow shell, provides auditory and kinesthetic clues about the environment and any impediments in the path of the user, yet cannot get caught, stuck or hung up on any obstacles.

Abstract: A saddle shaped mounting bracket straddles a conventional junction box mounting rail of a grid ceiling system and is used as a support location for hanging a lighting fixture from the grid ceiling. The mounting bracket has a straddle slot extending through the bottom portion of the bracket to allow the bracket to straddle the mounting rail. Threaded studs on the bottom of the bracket provide a means for coupling an electrical junction box to the bracket when the mounting bracket is used at an electrical feed location, or for coupling to other connector bracket hardware when the mounting bracket is used at a non-feed location. Load wires anchored to the overhead ceiling structure are attached to wire holes in the sides of the mounting bracket to provide efficient anchoring of the bracket.

Abstract: A cone crusher having a lower frame assembly and upper bowl assembly is provided with hold-down cylinders arranged in pairs which are oppositely inclined to counteract a rotational impact forces imparted to the upper bowl assembly. Additionally, the hold-down cylinders are inwardly inclined toward the gyratory axis of the crusher to exert a self-centering force on the upper bowl assembly. The paired and inclined cylinders form a conical truss arrangement that reduces the need for costly maintenance, repairs, and replacement of the hold-down cylinders.

Abstract: A vibrating shaft assembly has a magnetic compensation system for its rotating shaft for reducing the dynamic loads on the shaft bearings. The magnetic support system includes a radially magnetized permanent arc magnet which has an outward facing magnetic pole face and which is circumferentially affixed to the heavy side of the shaft at least one axial location along the shaft; it also has a stationary magnet, such as a permanent ring magnet or an electromagnet, external to the shaft for providing a magnetic pole face that surrounds the shaft in opposition to and concentric with the pole face of the shaft's arc magnet. The opposing pole faces of the stationary magnet and the arc magnet are of the same magnetic polarity such that, as the shaft and thus the permanent magnet on the heavy side of the shaft rotates, a constant radial repelling force is exerted on the heavy side of the shaft which counteracts the centrifugal force produced by the shaft's unbalanced mass.

Abstract: A luminaire, such as an indirect linear luminaire, is provided with a floating reflector assembly tied directly to securement points in the luminaire housing. The reflector assembly has a reflector element with tie down openings which overlay the reflector securement points and compliant spring-like retaining clips which overlap the tie down openings and which are secured at their center portion to the underlying securement points by a screw fastener. The width of the retaining clips are narrower than the tie down opening such that the center portion of the retaining clips can be drawn into and contact the housing securement points to provide good electrical grounding. The pressure contact of the retaining clips holds the reflector down yet permits it to float within the housing when the housing is distorted, such as by twisting, thereby avoiding distortion of the reflector.

Abstract: An apparatus and method for cleaning containers, such as sample containers for environmental testing, involves providing modular cleaning bays into which an array of inverted containers can be transported, such as by means of a drive chain. Independently operable nozzle banks disposed in the cleaning bay generally below the resident container tray are driven in an x-axis motion, such as by a stepper motor, to register a selected nozzle bank with successive rows of containers within the tray. At each row of containers the nozzle bank, which is selected in accordance with the size and spacing of the containers being processed, is caused to travel in a z-axis motion through a process cycle in which the nozzle elements of the nozzle bank traverse through the open mouth ends of the containers registered therewith and in which a fluid stream is projected directly onto the interior surfaces of the containers, preferably sweeping the entirety of those surfaces.

Abstract: A circuit for improving the transient behavior of a two-way loudspeaker system includes a crossover circuit with high selectivity, amplitude and phase correction circuitry for separately correcting the amplitude and phase responses of the high and low frequency drivers in their mounting environment, and correction circuitry for correcting the composite amplitude and phase response of the overall loudspeaker system after insertion of the crossover. A further phase offset technique and circuit provides for introducing frequency dependent phase shift in the loudspeaker system's high or low frequency channels for offsetting the phase responses of the high and low frequency drivers within the crossover frequency range. According to the phase offset technique of the invention, phase shift is added, preferably in the high frequency channel, until composite amplitude response curves observed on-axis and at different vertical angles off-axis are forced to be consistent.

Abstract: A ballast holder which can be fabricated from a single piece of bent sheet metal material, includes a gusseted riser structure, a base portion extending rearwardly from the foot of the riser structure, and a top flange portion extending in a forwardly direction from the top end of the riser structure for securing one of the mounting flanges of a ballast. The height of the rigid riser structure is chosen to be at least as great as the maximum height of a standard ballast to be held thereby. The ballast holder is used to install a ballast in an inverted position within a lighting fixture housing and can accommodate different sized ballasts. The ballast holder also reduces the amount of structure between the ballast and the overlying reflector element of the lighting fixture and thereby reduces the tendency of the ballast holding structure to bow or distort the lighting fixture's reflector where space is limited.

Abstract: A retaining device held in a compact, lensed, task lighting fixture operates to retain the lens in the fixture and to facilitate the removal of the fixture's fluorescent lamp which is otherwise difficult to access. The retaining device is comprised of a strip of resilient material having a base end mounted in a fixed position within the fixture, a resilient middle strip portion shaped to extend around the base end of the fluorescent lamp, and an outwardly biased distal end extending to contact and retain the lens in the fixture housing.