Abstract: A conveyor system is disclosed which is adapted to be suspended from an overhead monorail and which includes a plurality of carriages each having an open longitudinal portion extending therethrough. Each of the carriages interconnect one to another in a single file fashion so as to be moved as a unit below and along the overhead monorail. The conveyor belt is supported and carried by the carriages. An improved power transmission device is connected to at least one of the carriages for moving the plurality of carriages along the overhead monorail. The power transmission device means includes a pair of transversely spaced apart rotatable drive wheels which are drivably coupled to and which support a pair of transversely spaced apart power units. The power units are pivotally connected below the drive wheels. A hydraulic system is provided for pivoting the power units toward and away from one another to maintain the drive wheels in traction relationship with the overhead monorail.

Abstract: This invention is to a formed control member which is secured to a longitudinally stretchable or elongatable conveyor belt to provide a generally uniform longitudinal elongation throughout the length of the belt and to indicate a preselected total elongation of the belt. The form of the control member also provides a visual indication of the approximate elongation of the belt.

Abstract: An improved screw compressor for the compression and axial displacement of a gas is set forth. The compressor is of the type having a housing formed with an axially extending passage. The axially extending passage has at one axial end thereof a gas inlet and at the other axial end thereof a gas outlet. A one piece male rotor is positioned in the passage and extends axially therein. The male rotor is formed with a plurality of helical ribs having generally convex flanks and root regions which are at least partially formed as involutes in cross section. Each rib of the male rotor has a profile consisting of a leading flank formed at least partially as an involute generated from a first base circle and a trailing flank at least partially formed as an involute generated from a second base circle. The second base circle has a diameter greater than the first base circle.

Abstract: An improved drive sprocket for driving a chain is set forth. The drive sprocket contains a plurality of peripheral drive teeth having a leading drive surface thereon. The sprocket has a first pair of teeth spaced a predetermined circumferential distance from each other on a pitch circle about the sprocket and a third tooth being spaced a distance less than the above mentioned predetermined distance from the trailing tooth of the first pair of teeth. The leading drive surface of each tooth engages and drives the chain around the sprocket.

Abstract: A pneumatic motor for rock drills and the like having a reciprocating piston with valves at its opposite ends for valving motive air to the piston head from both ends of the cylinder. Large receivers are provided near the respective valves to accommodate availability of air on demand from the valves and to dampen pressure fluctuations. One of the receivers is connected to an external source of fluid under pressure; while the two receivers are interconnected by tubing external to the pneumatic motor itself. This permits the cylinder for the piston to comprise a simple tube provided with exhaust ports only. Additionally, exhaust air and oil from an air motor, which rotates the rock drill, are directed into the area between the lower end of the reciprocating piston and a striking bar for the drill rod to lubricate the reciprocating parts.

Abstract: An apparatus for bolting the roof of an underground mine is disclosed comprising a mobile frame, a boom extending from the frame and a housing provided at the end of the frame. The housing supports an upwardly extending stinger, a drilling mechanism including a drill centralizer having a central bore therethrough and a passageway in communication with the central bore, a device for delivering a container of roof bolting anchoring media through the passageway and through the drill centralizer and into a drilled hole, a device for indexing a roof bolt into alignment with the drilled hole and a spinner for driving the roof bolt into the drilled hole. The present invention also provides a method for bolting the roof of an underground mine comprising the steps of stinging a housing against the roof of the mine, moving a drill centralizer into communication with the roof and drilling a hole in the roof.

Abstract: A heat exchanger assembly has an elongated shell provided with fluid inlet and fluid outlet openings. An elongated bundle assembly is received within the shell. The bundle assembly has a plurality of elongated tubes extending generally longitudinally and a plurality of generally parallel fin plates which are transversely oriented. The bundle assembly has a top sheet and a bottom sheet. The bundle assembly support is interposed between the bottom sheet and the shell. A baffle is provided in the form of an elongated plate extending generally diagonally between the top sheet of the bundle assembly and the shell. In a preferred form, the baffle plate is provided with an underlying seal which is interposed between the baffle plate and the top sheet and has an upper edge which is of generally complementary curvature with respect to the adjacent portions of the shell and may take the form of a portion of a sine wave.

Abstract: A drill motor rigid enclosure is provided for a rock drill motor. The drill motor is encompassed within the enclosure such that viration, torque, and thrust produced by the motor is isolated from the rigid enclosure, therefore noise reduction of the drill motor is achieved.

Abstract: An improved endless flexible conveying element is set forth. The flexible conveying element is of the type adapted to be mounted on a carrier and to conform with a generally curvilinear endless path for orbital traverse of such endless path. The conveying element has an elongated resiliently deformable portion which includes a longitudinally extending portion located laterally intermediate the longitudinal extending side portions thereof. The resiliently deformable portion of said conveying element laterally flexes to permit the belt to follow laterally curvilinear portions of the endless path in an upright position. The resiliently deformable portion has a tendency to spontaneously assume a natural form thereof, which is configured such that the resiliently deformable portion, when mounted on the carrier, is deformed from its natural form in a manner to provide in the side portions a condition of relative longitudinal tension with respect to the central portion.

Abstract: An elongated conveyor having conveying and return traverses formed by an endless conveying element orbitally movable through a closed horizontally extending loop, the length and direction of which may be varied.

Abstract: A dual bushing centralizer is provided for a rock drill. The one bushing is provided for stabilizing the rock bit and a second bushing is provided which stabilizes the drill rod. An elastomeric stinger encapsulates both bushings and also provides a noise reduction seal around the drilled hole.

Abstract: A suspension system for the operator compartment of a mine vehicle suitable for working in underground mines having low head room. A pair of vertically extending guide tracks are rigidly secured to a frame member of the mine vehicle. Each of the track members has associated with it a roller bracket constructed so that all moving contact between the roller bracket and the guide track which guides it is a rolling contact. Each roller bracket includes a projecting stud member of substantial construction which passes through an opening in the rear wall of the operator compartment, the two stud members providing the only points of support for the operator compartment. The operator compartment normally rests on and slides over the floor of the mine and by this arrangement is free to move vertically up and down as the elevation of the mine floor changes or when the bottom of the operator compartment encounters obstacles or debris on the mine floor.

Abstract: A bearing structure which incorporates the advantages of a hydrodynamic film and of a hydrostatic squeeze film. The structure uses an inner elongated cylindrical bearing member with a hydrodynamic bearing therein, and an outer bearing member axially encompasses the inner bearing member. Passageways and adjacent surface on such members establish fluid flow paths, hydrostatic pockets and squeeze film areas to support such inner bearing member.

Abstract: An earth drilling apparatus including centralizer means for stabilizing a drive rod during drilling operations.

Abstract: An apparatus and method of controlling the input power to a drill feed or other hydraulic system in which the hydraulic power source is obtained from a compressed air supply. Wherein, the flow of air is varied in response to a hydraulic signal controlled by the load demand of the hydraulic system. Low and high mode controls are provided to operate hydraulically actuated mechanisms; and a hydraulic absorbing load is imposed to prevent stall or overspeed of the pump and motor during low load conditions.