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| Number | Title | Issue Date |
| 7931254 | Hoisting device The invention relates to a hoisting device for use at a wind turbine, in particular for use in a wind turbine nacelle, which hoisting device 1 comprises a reel 4, a drive motor 12, control means 14 and a hoisting line 6. The hoisti... | 04/26/2011 |
| 7410150 | Winch safety switch for a hoist An improved hoist for raising and lowering a weighted object secured to a hoist cable, wherein the improvement comprises a safety switch in series with an up-down switch of the hoist. The safety switch has an actuating member with spaced-apart first and second porti... | 08/12/2008 |
| 7311297 | Electric powered lift with load control A lifting device utilizing a utility winch having an electric motor and cable drum. The cable on the cable drum extends around a pulley located on a load cell beam. Excessive loads will deflect the load cell beam causing a contact on a micro switch to be engaged to ... | 12/25/2007 |
| 7232113 | Draw works In the drawworks for lowering and withdrawing a load, in particular a drilling or a drilling plugging device, in particular for use on floating drilling platforms, which drawworks has at least one brake arrangement for braking and holding the load, an emergency brak... | 06/19/2007 |
| 7228899 | Warning device and method to prevent clutch burning This invention is generally directed towards a system designed to assist the rig operator by alerting him/her that the air pressure is too low to be using the drum clutch, to provide a log for studies on rig operation technique, and to provide a training tool for ri... | 06/12/2007 |
| 7226037 | System for assuring engagement of a hydromatic brake on a drilling or well service rig The present invention provides an automatic system for engaging the hydromatic brake on a drilling rig or a service rig. This system monitors both the hook load and traveling block velocity, and uses an electrical solenoid to activates the hydromatic when either the... | 06/05/2007 |
| 7165759 | Crown block dead line anchor The line system on a drilling rig is arranged to place the dead line clamp at the upper end of the derrick. A dead line anchor sheave is preferably located to accept wraps of the dead line to insure reduced load on the dead line clamp. The anchor sheave is preferabl... | 01/23/2007 |
| 7114577 | Safemode operating system for a drilling or service rig Disclosed herein is a system designed to manage or slow the block travel speed down to safe speeds when the rig is operating in a light load/high speed condition. The system monitors and controls engine torque and horsepower, providing the minimum amount of each nec... | 10/03/2006 |
| 7090200 | Actuator An actuator and control algorithm which provide an operator with the ability to intuitively and responsively maneuver heavy work-pieces with ease and precision. The structure of the apparatus may provide a hoist with a compliant sensing system to measure the weight ... | 08/15/2006 |
| 7059427 | Automatic drilling system An automatic drilling system is disclosed which includes an electric servo motor operatively coupled to a winch brake control, a servo controller operatively coupled to the servo motor, and a drum position encoder rotationally coupled to a winch drum. The controller... | 06/13/2006 |
| 7048256 | Method and machine for installing a catenary cable During the installation of a catenary cable of a catenary of a track, the catenary cable is pulled from a storage drum, on which it is wound, and guided over winch wheels of a friction winch while being held under tension. From there, the catenary cable is passed on... | 05/23/2006 |
| 7028988 | Cable handling system A system or apparatus and method for retrieving cable from water during marine operations is provided that reduces damage to the cable from pulling forces during the retrieval. A pulling device distributes the forces and stresses all along the cable components. In o... | 04/18/2006 |
| 7028989 | Tire carrier A tire carrier assembly for storing a spare tire on a vehicle which includes a carrier adapted for supporting the spare tire and a winch operatively connected to the carrier to raise and lower the carrier between a stowed position wherein the carrier is inaccessible... | 04/18/2006 |
| 7026950 | Motor pulse controller The present invention provides a method and apparatus for generating one or more than one physically detectable physical influence changes to control or manipulate a down hole device. The present invention intercepts existing control signals to various controllers o... | 04/11/2006 |
| 6997442 | Safety sensor for a lift assembly A lift assembly having a drum rotatably mounted to a frame and linearly translatable with respect to the frame. A plurality of head blocks are connected to the frame along a helical mounting path, wherein linear translation of the drum during takeoff or take-up main... | 02/14/2006 |
| 6994172 | Well drilling control system An improved oil and gas drilling control system which utilizes improved braking and feedback technology which, in turn, permits more precise weight-on-bit control and more smooth transitions of weight-on-bit than any existing technology. In addition, the system also... | 02/07/2006 |
| 6022002 | Apparatus for the assisted handling of a load An apparatus for the assisted handling of a load includes at least one motor unit, which actuates the winding and unwinding of a flexible traction element; one or more guiding sheaves; and a detector for detecting the weight of the load and the force appl... | 02/08/2000 |
| 5762083 | Support for garbage chute cleaning apparatus A support for a garbage chute cleaning apparatus includes a cart having ground engaging wheels. Outrigger legs are provided for anchoring and providing lateral stability to the cart. A rotatably mounted reel is provided having a length of line mounted on ... | 06/09/1998 |
| 5713422 | Apparatus and method for drilling boreholes The present invention provides a drilling system for drilling a borehole. A motor continuously coupled to the drawworks may be utilized to raise and lower a drill stem to continuously control the weight on bit at a desired value. A second motor rotates th... | 02/03/1998 |
| 5662311 | Lifting apparatus including overload sensing device A load lifting apparatus comprising: a frame; a load engaging mechanism for engaging a load having a weight; a hoist mechanism for raising the load engaging mechanism, the hoist mechanism being mounted on the frame and including a member supporting the lo... | 09/02/1997 |
| 5533711 | Apparatus and method for pulling cable A primary device placed at the upstream end of a duct and a relay device placed at an access point pull a cable through respective duct segments. The pulling speed of the primary device is controlled by an operator. The pulling speed of the relay device i... | 07/09/1996 |
| 5361565 | Elevating system An elevating system especially designed for raising and lowering battens used in stages. The elevating system preferably uses two or more winch assemblies with synchronous motors coupled together in parallel to an AC inverter to provide smooth, ramped sta... | 11/08/1994 |
| 5351430 | Device and a method for autotrawl operation A compensating device equipped with a hydraulic cylinder/piston arrangement as a damping member, and a sheave operatively connected with the cylinder and piston arrangement, and a hydraulic accumulator connected to the cylinder, for use on board a trawler... | 10/04/1994 |
| 5348273 | Lifting appliance, especially for a patient lifting device A lifting appliance, especially for a patient lifting device, comprises a telescopic column (10) having a carriage (22) which is reciprocable in the longitudinal direction of the column under the action of the telescopic extension and retraction motions o... | 09/20/1994 |
| 5295664 | Motor-driven tensioning and winding device for lashing straps including an integrated control of the lashing tension Electromotor driven tensioning and winding device for lashing straps (7) in integral construction, preferably including a tactile three-point measurement sensor (2) in direct contact with a flat side (40) of the lashing strap (7). For this purpose, the me... | 03/22/1994 |
| 4927294 | Method and equipment for laying an elongated element underground In mobile laying apparatus for laying an elongated element, such as a cable, in a trench, especially a trench in a sea bed, which apparatus is advanced in a predetermined direction and includes apparatus for digging the trench and ways along which the ele... | 05/22/1990 |
| 4865393 | Method and apparatus for braking a derrick winch The invention relates to the braking, by means of a control lever, of the winch of a derrick equipped with a band brake and located away from the lever. The lever and the band brake are included in a servo-control circuit and connected by an electric tran... | 09/12/1989 |
| 4861218 | Mobile boat hoist A straddle-type crane having the load-lifting mechanism positioned rearwardly of the transversely-extending cross beam used to effect the parallel spacing of the longitudinally-extending upper support beams from which the load-lifting mechanism is support... | 08/29/1989 |
| 4692063 | System to control tension in a cable during underground placement A tractor provided with a cable reel at one end and a plow at the trailing end includes a system to monitor tension applied to the cable during underground placement. A capstan engages the cable while driven by a hyraulic motor and the pressure of the flu... | 09/08/1987 |
| 4679771 | Cable tension sensing apparatus Apparatus for sensing the tension in a cable and for maintaining the tension between a minimum tension and a maximum tension value comprises a rocker carrying a pulley about which the cable is passed, the rocker being pivotally supported for rotation betw... | 07/14/1987 |
| 4662608 | Automatic drilling control system An automatic drilling control system is disclosed for a conventional drilling apparatus and rig having a drill line rolled up or fed off the drum during drilling by the engine and extending through a crown block and traveling block to a fixed point provid... | 05/05/1987 |
| 4624450 | Constant tension hoisting system A constant tension hoisting system is provided for raising and lowering an object between a platform and a surface undergoing vertical motion relative to the platform, such as raising and lowering a lifeboat from a seagoing vessel to the sea in rough weat... | 11/25/1986 |
| 4544070 | Sway control arrangement for hoist systems An apparatus for controlling sway and pendulous motion of suspended loads is disclosed which is particularly suited for embodiment in association with a mobile crane or similar hoist system. The arrangement includes stabilizing cables attached to a load l... | 10/01/1985 |
| 4519585 | Drawworks brake control Apparatus for controlling a brake on a drawworks having cable wound thereon. A tension gauge detects the tension in the cable which is displayed on a switch gauge. A pulse generator provides periodic pulses to one side of a relay having a set of normally ... | 05/28/1985 |
| 4499971 | Material handling vehicle having improved chain monitoring An improved system for monitoring lift chains included within mast assemblies in material handling vehicles disables downward movement of the forks upon detection of a first level of slackness in a lift chain. Since upward movement of the forks is not dis... | 02/19/1985 |
| 4491301 | Tackles Interposed between the driving shaft of the tackle and the hoisting hook of the tackle is a flat textile strap or a flat metal braid. The strap or braid is attached to the drum of a drum-pulley keyed on the driving shaft at the end of the strap or braid. ... | 01/01/1985 |
| 4448395 | Improvements in and relating to winches A winch arrangement intended for the rapid shifting of aircraft or other wheeled vehicles which incorporate their own braking system and which may be under the control of an occupant during winching, is so constructed as to provide compensation for wide f... | 05/15/1984 |
| 4434971 | Drilling rig drawworks hook load overspeed preventing system The method and apparatus for preventing runaway lowering of a hook block in an oil drilling rig characterized by monitoring the instantaneous values of hook load and speed and using these values together with parameters associated with the rig drawworks t... | 03/06/1984 |
| 4418491 | Automatic angling machine A switching arrangement for preventing backlash in an automatic angling machine, to activate and deactivate a braking clutch in the angling machine dependent upon whether or not the fishing line issuing from the line reel of the machine is slackened or ta... | 12/06/1983 |
| 4403655 | Draw works disabling device for use with a well drilling apparatus A device for disabling the draw works of a well drilling apparatus responsive to the locking of the drill string by a blow out prevention device. The device comprises an air-actuated valve connected for regulating the flow of air to the air-actuated clutc... | 09/13/1983 |
