Abstract: The Assembly has a circular platform, which is threaded about its periphery, and has an upstanding stub about which to set a sleeve-type or cylindrical seal, as well as an arcuately cross-sectioned groove in circumscription of the base of the stub. A cup-shaped closure, having a circular wall, and threaded on the inner wall surface, threadedly engages the threaded periphery of the platform. Upon the platform and closure being threadedly engaged, the closure forces the seal along the stub until an inner end of the seal enters the groove and takes on a proper flare. The closure protects the seal from shipping damage.

Abstract: A vehicle is supported by wheel and tire assemblies. The assemblies each have a tire mounted around a cylindrical wheel rim and retained in place by an annular retaining ring that abuts the wheel rim and the tire. A lock ring is located in an annular groove in the wheel rim and abuts the retaining ring to hold the retaining ring in place against the tire. A tension plate is connected to the retaining ring through a set of tap screws to hold the tension plate against the end of the wheel rim and thereby retain the annular ring and the tire against rotation around the rim.

Abstract: A mine bolter machine has a main body supported by wheels and a main drill system structure forward of the main body. The main drill support is transversely movable relative to the main body and supports a first and second drilling mechanism. The first drilling mechanism is movable to the left of the main support structure and the second drilling mechanism is movable to the right of the main support structure.

Abstract: An impulse tool has an air motor connected to rotate a housing that carries a spindle adapted to be connected to a tool. The housing and cavity provide a pulsating force for rotating the spindle and tool to a pre-selected torque limit. When the limit is reached a rod in the housing is moved rearwardly to contact an "L" shaped arm. The "L" shaped arm is moved to release a valve assembly that operates to close off the air supply to the air motor and thereby turn off the tool.

Abstract: A selectable multi-wheel drive system for a mining machine has an electrical motor directly driving a wheel and driving a hydraulic pump through a clutching mechanism. Another wheel is connected to be driven by a hydraulic motor connected through a hydraulic circuit to be driven by the hydraulic pump. The hydraulic pump is selectively connected to the hydraulic motor so that one wheel or both wheels may be driven. The hydraulic circuit is controlled so that when in a one wheel drive condition the hydraulic motor is placed in a free-wheeling mode and no losses occur in the hydraulic circuit because of connection to the wheel.

Abstract: A hydraulic system is disclosed which provides automatic proportional actuation of pairs of hydraulic cylinders. The proportioning mechanism comprises one or more standard hydraulic cylinders.

Abstract: A drill box support mechanism for a mining bolter machine is driven by a hydraulic motor and drives a drill steel through a drill chuck. The drill box is supported on a support plate by a spring washer that extends over a central lip at the bottom of the drill box. A rod descends downwardly from the drill box offset from the center of rotation and engages a hole in the support plate.

Abstract: A seal gland for a pump shaft made of plastic material and adapted to retain a ceramic seal seat and having an annular groove for circulating cooling fluid around the periphery of the seal seat. The seal gland has an internal cavity part with an inlet and outlet for cooling fluid to be circulated through the gland. Another outlet provides cooling water for flowing around the seal seat through a hole in the supporting groove of the seal gland.

Abstract: Disclosed herein is a power feed system for translating a rotary drill head along the length of a guide tower. The system utilizes a compound balanced area, end fed hydraulic cylinder as the actuating means. This arrangement provides a large ratio of fixed overall length to usable travel distance, balanced feed force in both directions, direct connection of the rotary head to the outer stage of the cylinder, and drift-free operation, all without the need for moving hydraulic hoses.

Abstract: This invention pertains to a hydraulic reciprocating device having a housing and a piston in the housing. The piston has a first and second surface, and a means for intermittently communicating the first surface of the piston with a hydraulic pressure source. Also provided is a means for continuously communicating the second surface of the piston with pressurized fluid such as pneumatic fluid. The piston moves in a first direction when the hydraulic pressure source communicates with the first surface of the piston and the piston moves in a second direction when the hydraulic pressure source does not communicate with the first surface of the piston.

Abstract: A receptacle for retaining a battery case in a battery powered vehicle contains hydraulic cylinders for lowering and raising the battery case into and out of the vehicle. Retaining arms attached to the hydraulic cylinder have retaining lips that are moved by contact with the walls of the receptacle to engage lip extensions on the battery case when the battery case is loaded into the vehicle. Upon removal of the battery case a bias spring swings the retaining arms away from the battery and releases it for removal.

Abstract: According to a depicted embodiment thereof, the novel earth bit comprises a shank having a threaded end and a bit head centrally bored and threaded to receive a shank. A stack of apertured discs, however, is interposed between the threaded bore or cavity in the bit head and the threaded end of the shank. The discs intimately engage, and bridge between, the shank and bit head threads, and communicate torque therebetween. The bit head cavity has a bearing surface or land upon which the discs are supported, and the shank has an annular shoulder which bears upon the stack and, thus, compressive forces are communicated from the shank to the bit head. The bit head, of the invention, then, comprises the aforesaid bit head, having the stack of discs secured therein by a retainer, for use, in a plural-part earth bit having a threaded shank.

Abstract: An improved drill feeding mechanism for a rock and earth drilling machine is disclosed wherein substantially all the loading forces due to the drilling and extracting operations are directed away from the upper portion of the tower. This is accomplished in the preferred embodiment by having a hydraulically displaced carriage guidingly supported for linear translation along a drill tower. Cable reeving about the carriage is anchored at a mid point on the tower and reversably displaces a guided drilling head at twice the linear velocity of the carriage and in the same direction. A hydraulic cylinder is attached at the tower base and activates the carriage.

Abstract: An air duct system for use with mining machines in dust collection systems is connectable between a suction source and the cutting area of a mining machine and has two duct sections movable relative to each other. One duct section is mounted on the cutter boom of the mining machine and has an extendable upper wall, connected through a hinged plate, that abuts a wall of the first duct section which is mounted on the mining machine body. A lower hinged plate connected to the bottom wall of the duct swivels freely and rests on the bottom wall of the first duct to enclose the space between the two duct sections.

Abstract: A rotating device for a drill mast of a roof bolting mining machine has a pair of hydraulic cylinders respectively connected to appropriate ends of a lever arm. The hydraulic cylinders are connected at their respective other ends to the mast and to the mining machine. Full contraction of one cylinder rotates the lever arm which rotates the mast up to 45 degrees. Additional contraction of the other cylinder rotates the mast an additional 45 degrees.

Abstract: A column and bearing assembly having a column, a shaft in the column and a guide bearing means disposed in the column to support the shaft.

Abstract: A roto-dynamic pump having recirculating means for preventing pump cavitation surging at low flow rates and at moderate to low values of net positive suction head.

Abstract: A roto-dynamic pump having recirculating means for preventing pump cavitation surging at low flow rates and at moderate to low values of net positive suction head.

Abstract: A mobile, low-profile feeder-crusher machine for receiving, crushing and feeding freshly mined coal to a stationary conveyor system includes a rigid frame supporting a rotary crusher shaft and supporting an endless conveyor for delivering coal to the crusher shaft and for removing crushed coal therefrom. The drive system for the crusher shaft is mounted on the frame and includes a hydraulic pump driven by an electric motor, a hydraulic motor driven by the pump, a planetary gear reduction driven by the hydraulic motor and having a carrier output driving the crusher shaft, and a flywheel rotatable with the input of the reduction gear assembly.

Abstract: The seal, for use especially in non-lubricated, high-pressure, as compressors, in a one-piece, continuous sleeve which envelopes a reciprocable piston for sealing against the piston, or against the cylinder in which the piston translates. One end of the sleeve effects the sealing engagement, and the other end is spring-loaded to maintain the engagement. During operation of the compressor, or the like, it is the high-pressure gas which urges the seal into sealing engagement.