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| Number | Title | Issue Date |
| 7255330 | Field adjustable bridge crane block A field adjustable block for use with a bridge crane having a rotating cylindrical drum for rope. The block includes a cylindrical center pin having a key way recess parallel to an axis of the center pin. An inner side plate has an opening therethrough and an extend... | 08/14/2007 |
| 7152349 | Dragline bucket rigging and control apparatus A large electric dragline having a housing (35) and boom (37) is provided with spaced apart in-line sheaves (34) and (36) at boom point to separate hoist ropes (31) and (32) which are led to the front and rear of bucket (... | 12/26/2006 |
| 7024805 | Dragline excavating machine with direct drive hoist and drag drums A dragline excavating machine includes a gearless direct drive AC drive motor for driving each of the hoist and the drag drums in the system. The gearless AC motor is driven using a digital system which receives AC power from the utility system rectifies the power u... | 04/11/2006 |
| 7024806 | Auxiliary assembly for reducing unwanted movement of a hoist rope An auxiliary hoist sheave assembly comprising a sheave support frame, a mechanism for mounting the sheave support frame to a boom, a lower sheave shaft mounted on the sheave support frame, and a grooved hoist sheave, rotatably supported by and slidable along the low... | 04/11/2006 |
| 6826466 | Dragline dump position control A method of controlling the dump position of a dragline (1) of the type where inclination of the bucket (4) is controlled by differential control of the front hoist rope (7) and the rear hoist rope (8), in order to control dumping too clo... | 11/30/2004 |
| 6588126 | Drag link bucket controls A dragline excavation bucket control system including a pair of hoist ropes and a drag rope, the hoist ropes being coupled adjacent opposite ends of the bucket. The hoist ropes are supported on spaced sheaves on an excavation boom whereby the hoist ropes ... | 07/08/2003 |
| 6484423 | Dragline rigging system The invention relates to a dragline rigging system (10) which includes a pair of drag lines (12) connected to drag connection points (24) on a dragline bucket (18) for dragging the bucket through material to be excavated, a pair of hoist lines (14) connec... | 11/26/2002 |
| 6401370 | Fairlead mechanism A dragline comprising a main housing including a generally horizontal platform, a boom extending forwardly from the main housing, a bucket suspended from the boom, a winding drum mounted on the platform for rotation about a generally horizontal axis, a fa... | 06/11/2002 |
| 6038795 | Dredger with lockable rear door A dredge having substantially a box-like shape, with an open front face and an open rear face, the rear face having a door hinged thereto and a lock member to hold the door in a locked position. An A-shaped frame member is pivotally secured to the front e... | 03/21/2000 |
| 6039193 | Integrated and automated control of a crane's rider block tagline system A method is provided to automatically control a cranes's rider block lifte and taglines. Current position of the crane's rider block is determined in terms of its horizontal and vertical coordinates, as well as in terms of the inhaul angle of the liftlin... | 03/21/2000 |
| 5970636 | Dump block An integral dump block for use in a dragline bucket that comprises a sheave to movably support a dump line, a central pin rotatably supporting the sheave, and a housing to couple the pin to lift lines. Bearings are disposed within the sheave and each side... | 10/26/1999 |
| 5832638 | Low draft high yield bucket system for draglines A low draft, high yield, dragline bucket system that has about half the weight of current art. It has a low wide configuration with special highly efficient ground engaging, loading and dumping qualities. The strength, cube accomplishment, simplicity, and... | 11/10/1998 |
| 5752334 | Dumping system for a dragline bucket A draglined bucket having first and second contoured dumping rails respectively supported on first and second spaced apart opposite sidewalls and a rear wall. Each dumping rail extends from above the sidewall on which it is supported to the rear wall on w... | 05/19/1998 |
| 5619810 | Pin retention device and related method for retaining a trunnion link pin in a digging implement Disclosed is a digging implement (such as a dragline bucket) having a trunnion link connected to the implement by a pin secured in place by a retention device. Such device is coupled to the pin along the pin longitudinal axis. The pin has a first portion ... | 04/15/1997 |
| 5603174 | Dragline including improved walking mechanism A dragline comprising a main housing, a bucket hoist mechanism mounted on the housing, a bucket drag mechanism mounted on the main housing, a walking mechanism for moving the main housing over the ground, the walking mechanism including a motor mounted on... | 02/18/1997 |
| 5600905 | Dragline with improved pinion shaft mounting A dragline comprising a main housing, and a moving mechanism for moving the main housing over the ground, the moving mechanism including a drive mechanism mounted on the main housing, an output shaft which extends along an axis and which is driven by the ... | 02/11/1997 |
| 5446982 | Motion controller handrest with lever lock A dragline comprises a main chassis, a mechanism for moving the main chassis over the ground, a boom mounted on the main chassis, a sheave rotatably mounted on the boom, a dragline bucket, a hoist rope reeved over the sheave and having an end connected to... | 09/05/1995 |
| 5408767 | Excavation controlling apparatus for dipper shovel An excavation controlling apparatus which can effect precise driving control off a dipper in accordance with an actual operation condition with a simple structure of a low cost. A dipper handle extension instruction calculation section calculates a dipper... | 04/25/1995 |
| 5400530 | Dragline excavator bucket and rigging A dragline excavating bucket is constructed to be supported through a minimum number of support chains and control cables, and made to provide for rapid digging and distribution of overburden removed by dumping the bucket rearwardly over a rear wall of th... | 03/28/1995 |
| 5349766 | Boom support pendant pin retainer A boom support pendant pin retainer for an earth working machine having a retainer plate and a projection for preventing rotational, axial and coaxial movement of the pendant pin. The projection is constructed and arranged to mesh in the void between the ... | 09/27/1994 |
| 5343641 | Spreader bar for strip mine rigging apparatus A spreader bar assembly has a middle spreader bar having a nose-shaped link at opposite ends to which is pivoted pivotal end pieces which comprise about half of the structural weight. The pivotal end pieces have a rounded tip portion which is pivotally co... | 09/06/1994 |
| 5307571 | High production system bucket A high production dragline bucket which has a low profile in the back wall as well as fewer components than those commonly in use. The bucket is not only lower in production costs, but has higher operating efficiencies. It is adaptable to both single or d... | 05/03/1994 |
| 5226249 | Tightline apparatus for draglines A tightline apparatus for draglines which includes a pair of mechanical safety devices, each having an engaging bar pivotally attached to a swivel frame of the dragline above each drag rope at the point where the respective drag rope extends between each ... | 07/13/1993 |
| 5140761 | Dragline bucket line protection device In a support assembly for an excavating dragline bucket controlled by a hoist line and a drag line, the bucket having opposite side walls and an open forward end, a line protection device includes a sleeve for encircling the hoist line adjacent the bucket... | 08/25/1992 |
| 4542600 | Method for controlling the depth of dragline excavating operations The operation of a dragline machine in digging below the earth's surface is monitored to provide measurements of the variations in pull cable length, lift cable length, and main boom inclination. From these measurements, the angle of inclination of the pu... | 09/24/1985 |
| 4370713 | Anti-tightline control system and method for dragline type equipment An anti-tightline control system and method which monitors the hoist and drag rope-in length of dragline type equipment, and in the event that certain preset levels are exceeded, the control system functions to slow the hoist and drag rope drives, initiat... | 01/25/1983 |
| 4368521 | Method and apparatus for dragline tightline protection Method and Apparatus are described for effecting tightline protection in a dragline excavating machine or the like. The described technique uses optical shaft encoders to provide binary coded decimal inputs related to the amount of hoist and drag rope pai... | 01/11/1983 |
| 4364704 | Grab bucket suspended from hoisting installation The disclosure is directed to a grab bucket suspended from the cable of a hoisting means. The hosting means includes a first reversible motor drive means to raise and lower the grab bucket and a second motor drive means is associated with the grab bucket ... | 12/21/1982 |
| 4284265 | Dual drive system for dragline with power interlock Separate torque converters are selectively clutched to the hoist and drag drums of a dragline machine with a selectively engageable clutch providing a power interlock of the output of both torque converters to either one of the drums as desired. The appli... | 08/18/1981 |
| 4261119 | Method for digging and transporting material In digging and hauling soil, rocks, minerals and the like by the use of a dragline the invention provides a novel combination of said dragline, a conveyor for hauling the materials dug, and a hopper disposed over and movable along the conveyor whereby mat... | 04/14/1981 |
| 4143856 | Split drive system for dragline with power interlock Separate torque converters are selectively clutched to the hoist and drag drums of a dragline machine with a selectively engageable clutch providing a power interlock of the output of both torque converters to either one of the drums as desired. Another c... | 03/13/1979 |
| 4035936 | Excavator attachment for boom structure An excavating device is disclosed which is capable of attachment to a conventional hydraulic boom structure having a power-driven winch cable. The device has a bucket pivotably mounted thereon, such that when the device is attached to the boom structure i... | 07/19/1977 |
| 4035621 | Excavator data logging system A system for measuring, storing, and analyzing excavator parameters in order to classify excavator activity. A rotary position sensor is coupled to the drag drum, the hoist drum, and the center pindle of an excavator in order to generate analog signals th... | 07/12/1977 |
| 3971215 | Power shovel and crowd system therefor A power shovel comprising a body; a front end assembly mounted on the body including a dipper; means for crowding the dipper; means for hoisting the dipper; and an energy regeneration system including an energy storing means and means actuated by a predet... | 07/27/1976 |
| 3934126 | Control device for a dragline excavator A control device for a dragline excavator, comprising hoist and drag rope length increment transducers and revolving platform swing angle transducers responding to the movement of a bucket from its breakout point on the face to the dumping point and from ... | 01/20/1976 |
