Assignee: Joy Manufacturing Company

Location: Pittsburgh, PA
No. of patents: 165

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Number	Title	Issue Date
4852724	Crawler-mounted conveying train A material conveying system capable of traversing a surface along an elongated path having at least one curvilinear portion. The conveyor structure includes a plurality of framework members arranged in tandem on the surface of the elongated path. There ar...	08/01/1989
4750274	Sludge processing Methods for continuous drying of sludges. Large scouring particles are added to a sludge to be dried to create a mixture which is passed through a rotary screw type indirect heat exchanger. The scouring particles are large relative to the particulates of ...	06/14/1988
4682757	Secondary backseat for gate valve A rising stem expanding gate valve including an improved metal-to-metal stem backseat seal assembly. An axially slidable seal ring is press fit onto the valve stem and is adapted to seal against a counterbored bonnet seat portion to provide a secondary me...	07/28/1987
4667812	Conveyor belt assembly and method Apparatus and a method of protecting the lateral edges of a conveyor belt. A resilient tubular member having a longitudinal slit therein is in resiliently maintained contact with the belt adjacent lateral edges. The resilient member may have portions of i...	05/26/1987
4667813	Conveyor belt chain An improved chain for use as a tension element in conjunction with a resiliently deformable conveyor belt which permits the belt to be prestretched at installation by a predetermined, controlled and limited amount....	05/26/1987
4658848	Heat responsive backseat for gate valves An improved heat responsive backseat for gate valves which includes a rotating valve stem (50) carried by a bonnet assembly (14) for actuation of a gate member (40). A fusible stem ring (126) supports the valve stem at an outer portion thereof (68) within...	04/21/1987
4655507	Continuous miner A maneuverable mining machine is disclosed. The mining machine has a chassis with at least one cutting head mounted on the front of the chassis and adapted to cut into a mine face extending transversely across the front of the machine. The cutting head co...	04/07/1987
4651970	Valve actuator with auxiliary energy storage means A fluid-powered actuator assembly 10 for gate valves 13 having a slab gate 21 with a port 22 adapted to be placed in registry with the flow passage through the valve wherein the valve is moved to open position by application of fluid pressure to the actua...	03/24/1987
4650225	Hydraulic holddown screw with mechanical retention means A holddown screw assembly 10 which features a shaft 33, an energizer screw 39 and a detachable contact nose 20 adapted to be assembled in coaxial alignment in a radial bore in a wellhead structure. The shaft is provided with a passage 40 extending from it...	03/17/1987
4650254	Bit holder A bit holder for a replaceable bit is disclosed. The bit is of the type having a pointed head portion axially extending from a shaft portion. The bit holder has a holder part for receiving the bit and has a base part for securing to a cutter head. The bit...	03/17/1987
4650226	Holddown screw A holddown screw 10 which features a shank 23 and contact nose 22 of separate construction. The contact nose 22 is provided with a flat bevelled contact surface 32 of predetermined angle to the axis of the screw selected to correspond to the angle of the ...	03/17/1987
4648292	Tong assembly A tong assembly for makeup and break out of tool joints including a power tong and a backup tong which is rotatable through a limited rotation with respect to the power tong. During a torquing operation a single, self energizing free jaw and die grips the...	03/10/1987
4648794	Pump with high speed expeller Pumps for pumping liquids including a gear train for rotating an expeller at a speed greater than the speed of the pump primary impeller....	03/10/1987
4647749	Apparatus and method for weld cladding cylindrical objects Apparatus and method for depositing a corrosion resistant weld clad material upon a cylindrical surface of a workpiece such as the internal cylindrical conduit of a valve body (10). The apparatus includes a turntable (12) having a rotating platform (24) w...	03/03/1987
4643395	Valve with protected seats A gate valve 10 of slab gate variety with "floating" seats having means for protecting the seat ring seals and seat pockets in severe operating conditions. Each seat ring (40,41) is provided in its rear face (43,44) with an annular groove (49) coaxial wit...	02/17/1987
4616725	Suspension system for operator's compartment A suspension system for an operator's compartment of a mine vehicle. The mine vehicle is of the type having a body wherein the operator's compartment is floatingly supporting on the body adjacent one side thereof for riding on the mine floor as the vehicl...	10/14/1986
4607891	Rotary retainer for mining bits A cutter bit holding assembly is disclosed. The cutter bit assembly contains a cutter bit having a shank portion and a cutter bit holder having a socket for receiving the cutter bit shank portion. Also included is a rotary locking element which is associa...	08/26/1986
4601308	Ball valve with seat loading mechanism A top-entry ball valve 10 comprising a valve body 12 having a chamber 13, flow passages 14, 15, a ball 20 rotatably mounted in the chamber for movement between open and closed positions relative to the passages, and a pair of seat assemblies 50 at opposed...	07/22/1986
4596286	Rotary processor A rotary processor useful in mixing, conveying, and heating or cooling a fluid material. Interchangeable subassemblies each comprise a helical coil permanently affixed at each end to a terminal block. The terminal blocks of each subassembly are removably ...	06/24/1986
4589981	Fluidized bed classifier Fluidized bed systems for segregating cleaning or classifying particulate matter of differing physical properties such as particle density or size. Multiple stage beds preferably operate in a partially fluidized state and the classification structure prov...	05/20/1986
4585207	Expanding gate valve with pneumatic actuator A piston type pneumatic powered actuator (9) for operating a valve (10) of the expanding gate type wherein velocity of the piston-stem-gate drive train is maintained substantially constant in the latter stage of the actuator stroke. The actuator (9) inclu...	04/29/1986
4584271	Bacterial regeneration apparatus and process Apparatus and a method are disclosed for reducing sulfate contained within a flowable material to hydrogen sulfide by the use of two stages of reaction. The flowable material is deoxygenated and then introduced into a first reactor which contains a sulfat...	04/22/1986
4575106	High pressure sealing connection with metal seal A high pressure sealing connection for sealing between coaxially aligned members (22, 10) which are connected by metal bolt means having a different coefficient of thermal expansion from the aligned members. The connection comprises a metallic sealing rin...	03/11/1986
4570942	Dual diameter valve stem packing A "fire-resistant" packing arrangement (30) for use with linear motion or rotary motion shafts (20) characterized by a stepped dual diameter packing chamber provided by successive enlargements of the stem bore (22). A primary packing assembly (31) dispose...	02/18/1986
4571330	Flue gas desulfurization Systems for desulfurization of a flue gas containing fly ash including formation of a dry powder in a spray dryer absorber resulting from reaction of an alkaline aqueous feed and the flue gas. The dry powder is collected and a specifically selected fracti...	02/18/1986
4569489	Cable tension control device A cable tension control device for an electrically powered mine vehicle is disclosed. The vehicle is of the type having an electric trailing cable wound on a cable reel mounted on the vehicle. The cable reel has a motor for rotating the reel in the direct...	02/11/1986
4568058	Dual stage hydraulic actuator for expanding gate valve A dual stage hydraulic actuator (9) for actuation of an expanding gate valve (10). The actuator is mountable to the valve housing and comprises a housing 40 which defines a piston chamber 41 and a primary piston (61) slidably received therein. An actuator...	02/04/1986
4557524	Mining machine duct work arrangement A mining machine is disclosed which has a vehicle body with a first end thereof having a boom pivoted for up and down rotational movement about an axis extending transversely of the vehicle. A cutter head is carried by the boom and a conveyor is mounted o...	12/10/1985
4556117	Free floating operator compartment A suspension system for an operator's compartment of a mine vehicle is set forth. The mine vehicle is of a type that has a body and operator's compartment positioned adjacent to the body. A guide is attached to the body of the vehicle and a rail is attach...	12/03/1985
4556224	Crossover seal assembly A crossover seal assembly (44) for sealing the annulus between a well casing (16) and tubing head (22). The assembly includes spaced pairs of upper and lower metal seal rings (60 and 72, 108 and 120) having matching frusto-conical wedging surfaces (70 and...	12/03/1985
4549119	Control system and method for operating mining machine traction motors and the like Method and apparatus for controlling DC traction motors on opposite sides of a vehicle, particularly a mining machine, by means of an SCR converter. The motors are accelerated while controlling the firing angles of the SCR's such that the current and volt...	10/22/1985
4541490	Adapter for a wellhead Improved wellhead structure and method for modification of commercially operating wellheads. Screwed type wellheads include an adapter attached to a body extending upwardly from a well bore. The adapter supports a stripper rubber and a slip assembly on in...	09/17/1985
4535967	Expanding gate valve with fluid-powered actuator An expanding gate valve (10) provided with a piston type pneumatic powered actuator (40) for opening and closing the valve wherein the actuator piston (54) is adapted to be driven by fluid pressure in one direction to operate the valve but is returned by ...	08/20/1985
4535326	Liner deterioration warning for fluid movers Method and apparatus for detecting deterioration of a replaceable liner in a pump transporting an electrically conductive fluid medium. A conductive component is isolated, during normal operation, from the conductive fluid medium by the electrically insul...	08/13/1985
4530377	Block valve A block valve (10) for selectively establishing and selectively blocking communication between a pressurized fluid supply (30), a fluid actuated device (DHSV) and a reservoir (35). The valve comprises a valve body (41, 42) with an inlet (81), an outlet (8...	07/23/1985
4519715	Propeller Propellers including blades affixed to a hub which provide generally axial flow of a fluid medium through the blade area. The blades are formed from cylindrical segments and include a generally straight leading edge and a generally convex trailing edge....	05/28/1985
4516752	Mechanically preloaded packing assembly A pressure energized mechanically preloaded packing assembly (48, 68) of a high pressure gate valve (10). The packing assemblies are positioned in an annular space about the valve stems (36, 64) for sealing between the valve stems and bonnet (38) or valve...	05/14/1985
4515174	Gate valve with internal pressure relief means A valve (10) having an expansible gate assemblage of ported juxtaposed gate and segment members (18, 19) which are movable into sealing engagement with upstream and downstream valve seats (28) about the flow passage (12, 14) in the open and closed conditi...	05/07/1985
4515347	Valve seat structure A valve seat structure adapted to be positioned within each annular seat pocket (37, 36) which is formed about the flow passage (12, 13) adjacent the valve chamber on both the upstream and downstream sides of the gate element of a gate valve. The valve se...	05/07/1985
4514195	Discharge electrode Discharge electrodes for use in electrostatic precipitators. In preferred form a discharge electrode is formed of a pair of body elements arranged in a partially overlapping relationship. The overlapping structure is such that a longitudinally extending s...	04/30/1985

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Assignee: Joy Manufacturing Company