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| Number | Title | Issue Date |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 4514796 | Method and apparatus for controlling the position of a hydraulic boom A method is set forth for controlling the orientation of an articulated boom of the type having a first portion and a second feed arm portion such that the first portion remains parallel to a predetermined position during movement of the articulated boom.... | 04/30/1985 |
| 4500228 | Granular material pneumatic transport apparatus An apparatus for transporting granular materials is disclosed comprising a first conduit having an inlet for introducing the granular material, and transport pump for transporting the material through the first conduit. A nozzle provides a compressible fl... | 02/19/1985 |
| 4489985 | Cutter drum extension latching mechanism A continuous mining machine cutting head structure is set forth. The mining machine is of a type having a support member and an elongated mining head member mounted on the forward end of the support member. The head member is powered for rotation about it... | 12/25/1984 |
| 4486051 | Mining Machine A mining machine is disclosed comprising a mobile base and a cutting head assembly at a forward end of the mobile base having a cutter drum rotatable about an output shaft disposed along the longitudinal axis of the cutter drum. A drive system for the cut... | 12/04/1984 |
| 4476975 | Monorail suspended conveyor system 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 s... | 10/16/1984 |
| 4474289 | Control member for an elongatable conveyor belt 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 elongat... | 10/02/1984 |
| 4445831 | Screw rotor machine rotors and method of making 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 ... | 05/01/1984 |
| 4433777 | Conveyor belt drive sprocket 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 f... | 02/28/1984 |
| 4429752 | Pneumatic motor for rock drills and the like 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 ... | 02/07/1984 |
| 4420277 | Mine roof driller-bolter apparatus and method 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 inclu... | 12/13/1983 |
| 4415024 | Heat exchanger assembly 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 ... | 11/15/1983 |
| 4402383 | Drill motor enclosure 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... | 09/06/1983 |
| 4387801 | Conveyor belt 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... | 06/14/1983 |
| 4380288 | Conveyor 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.... | 04/19/1983 |
| 4377213 | Dual bushing centralizer 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 ... | 03/22/1983 |
| 4365849 | Hydrodynamic shaft bearing with concentric outer hydrostatic squeeze film bearing 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 encom... | 12/28/1982 |
| 4365682 | Suspension system for operator compartment 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 mem... | 12/28/1982 |
| 4351399 | Drill An earth drilling apparatus including centralizer means for stabilizing a drive rod during drilling operations.... | 09/28/1982 |
