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| Number | Title | Issue Date |
| 7896315 | Control and regulation device for safeguarding a conveyor device, conveyor device and crane unit A control and regulation arrangement for protection of a conveyor or other hoisting or crane device that assures a safe reaction to overloading. A brake apparatus is provided that acts on the conveyor under control of an overload sensor. If the load approaches a pre... | 03/01/2011 |
| 7850145 | Portable pulling tool A portable pulling tool is provided including an integrally formed one-piece gear case for positioning all of the gear train components. The gear train includes a combination of helical gears and a differential planetary gear unit in a unique configuration. A motor ... | 12/14/2010 |
| 7850144 | Hoist for elevator An elevator hoist apparatus includes a stationary frame member, a main shaft, a stationary element disposed to said stationary frame member, a rotary frame member supported on said main shaft and extending in a radial direction in axial opposition to said stationary... | 12/14/2010 |
| 7500650 | Safety circuit for lift doors An improved lift system door control or safety circuit utilizes locking devices for the lift shaft doors and lock sensors to monitor the status of the locking devices. The lock sensors are coupled to a lift drive unit control through a data bus, which need not be es... | 03/10/2009 |
| 7416169 | Hoisting-cable drive comprising a single bottom-hook block and two winches The invention proposes a hoisting-cable drive for a mobile crane, which hoisting-cable drive uses a single bottom-hook block (15) instead of a known double bottom-hook block. However, to prevent this single bottom-hook block (15) from tilting in the tw... | 08/26/2008 |
| 7389972 | Lifting system with overload protection circuit A pneumatically operated hoist system including a load support is disclosed, wherein the system is capable of sensing an overload and preventing the raising of the load support. ... | 06/24/2008 |
| 7374153 | Dual braking device for a power winch A dual braking device for a power winch includes a first braking device and a second braking device, which is composed of a transmitting sleeve, a braking lining, an electromagnetic induction coil, a magnetic conduction member, and an elastic member. When the power ... | 05/20/2008 |
| 7293761 | Diagnostic system for cranes A hoist system for critical loads incorporates improved safety technology to monitor various possible fault conditions. For example, a command-not-operated function causes braking of the hoist when an encoder detects one of a group of conditions including a lack of ... | 11/13/2007 |
| 7267241 | Device for determining a load on a hoist The invention relates to a device for determining a load on a hoist of a crane for handling a container, including rope drum, drive motor as well as hoist transmission disposed between drive motor and rope drum and having a hoist transmission case which is swingably... | 09/11/2007 |
| 7237765 | Speed limiting system for lifting devices Speed limiter system to detect over speed and generate a signal to cut the power and if necessary operate brakes. It consist of the limiter itself, with a tension pulley. The limiter consists of weights connected by a mechanism that moves asymmetrically and by centr... | 07/03/2007 |
| 7225616 | Stopping apparatus and method for oil pump In stopping apparatus and method for an oil pump, which are applied to a hydraulic actuator that works based on a hydraulic pressure derived from the oil pump driven by a motor, a backward rotation of the oil pump is prevented by resisting a remaining pressure that ... | 06/05/2007 |
| 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 |
| 7180255 | Controlling the release of a brush motor which has applied a load A method for controlling the release of a brush motor which has applied a load includes several steps. One step includes applying a release current to the brush motor to rotate the brush motor in a direction toward releasing the applied load of the brush motor. Anot... | 02/20/2007 |
| 7159851 | Apparatus for deploying and retrieving water sampler An apparatus includes a bi-directional DC motor; a gear reducer connected to the DC motor; a pulley mounted on an output of the gear reducer; an anti-back drive brake mounted on the output of the gear reducer; a reel wound with cable; a second pulley attached to the... | 01/09/2007 |
| 7080824 | Chain motor drive controller An improved chain motor drive controller is provided for a chain hoist. The system employs a position encoder including a position sensor located within the casing of the chain hoist to producing encoded electrical position signals. A motor pulley is mounted on the ... | 07/25/2006 |
| 7080825 | Chain motor drive control system An improved chain motor drive controller is provided for a chain hoist. The system employs a position encoder including a position sensor located within the casing of the chain hoist to producing encoded electrical position signals. A motor pulley is mounted on the ... | 07/25/2006 |
| 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 |
| 6932325 | Active-over-passive coordinated motion winch The instant invention is directed to a active-over-passive coordinated motion winch designed to be used in combination with a class of existing offshore lifting systems such as A-Frames, booms or cranes to minimize the relative movement between a payload position an... | 08/23/2005 |
| 6893005 | Tensing a flexible floating cover Apparatus comprising a tensing element connected at one end thereof to a supporting structure and at another end thereof to a cover, wherein movement of the cover imparts a force on the tensing element, an actuator adapted to move the tensing element, and a sensing ... | 05/17/2005 |
| 6655662 | Method for controlling crane brake operation The invention relates to a method for controlling the operation of a crane brake, the crane comprising an electric motor (2) controlled by means of a frequency converter (10) for hoisting and lowering movements of the crane; an electromechanical brake (9)... | 12/02/2003 |
| 6595493 | Device for controlling a motor-driven hoist A device for controlling a motor-driven hoist, includes a housing and a control unit supplied with electric energy from a power source and secured to the housing. The control unit has control elements operable from outside the housing between an inactive ... | 07/22/2003 |
| 6029951 | Control system for drawworks operations The system and method for use with a drawworks having a rotatable drum on which a line is wound, wherein the drawworks and the line are used for facilitating movement of a load suspended on the line, includes a drawworks control system for monitoring and ... | 02/29/2000 |
| 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 |
| 5167400 | Has invented certain and useful improvements in control device for lifting winches, in particular for drilling rigs A control device for lifting winches, in particular for drilling rigs, uses an electric motor able to operate in all four quadrants of the torque-speed diagram. A control circuit procures controlled excitation of the electric motor. A manipulator on a con... | 12/01/1992 |
| 5120023 | Hoist winding system A shaft winding or winch system for raising and lowering a load attached to one end of a rope. The system includes a brake unit for braking a drum, a detection unit for detecting the length of the rope, and a control unit for controlling the brake unit ac... | 06/09/1992 |
| 5039028 | Overload protection Method and device for indicating overload are provided for a load suspended from a hoist. The hoist comprises a slip-ring induction motor (1). The input power together with the angular acceleration of the motor are metered. Then the metered values are com... | 08/13/1991 |
| 4804095 | Cutoff device for crane systems The cutoff device is provided for crane systems, especially a dredger to which a grab 1 is attached. Grab 1 has a cable 5 connected to it, which is guided over pulleys 4, 7 and kept under tension with the help of a weight 9. One of the two pulleys 4 is pr... | 02/14/1989 |
| 4714208 | Magnetic brake control for fishing reel A bait cast fishing reel includes electronic timing circuitry for controlling deceleration of the spool thereof, about which fishing line is wound and playing out. The spool is mechanically released and the timing circuitry is activated by the pressing of... | 12/22/1987 |
| 4555093 | Cable pulling device with force indicator and overload protection The cable pulling device includes a control unit having a force indicator gauge and a switch and circuit breaker assembly in series in the hot wire to the electric motor which rotates the capstan for cable pulling. Power to the electric motor can thereby ... | 11/26/1985 |
| 4492363 | Multiple pulley sheave assembly with retainer pulleys Disclosed is a multiple pulley sheave assembly for supporting a cable comprising a plurality of pulleys, including a center pulley, mounted in an arcuate path on a support frame; a pair of retainer pulleys for keeping the bend of the cable constant around... | 01/08/1985 |
| 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 |
| 4433755 | Elevator apparatus An elevator apparatus comprising a reduction gear unit having reduction mechanism of rotary parts of parallel axial gears, an input shaft and an output shaft as main parts; a main rope suspending a car and a counterweight; a traction sheave which is direc... | 02/28/1984 |
| 4423943 | Photographic film assemblage having a non-lighttight film withdrawal opening A photographic film assemblage including a film spool about which is wound a length of film, a housing for rotatably supporting the film spool such that a leading end of the film may be advanced to the exterior of the housing via a film withdrawal opening... | 01/03/1984 |
| 4403845 | Cassette for holding and dispensing a roll of web material A cassette for holding and dispensing a roll of web material that is provided with locking means for preventing rotation of the roll prior to initial withdrawal of material from the roll, the locking means being formed by a generally rigid locking member ... | 09/13/1983 |
| 4349179 | Control means for motion compensation devices A control system for stabilizing a body suspended by a flexible line from a structure such as a ship, which is subject to uncontrolled oscillating movements, such as may be caused by wave motion, incorporates a winch (3) to which the line is attached, a p... | 09/14/1982 |
| 4276498 | Adjustable torque control winch system System for maintaining a preselected constant torque on a loaded reel of a winding mechanism. The system includes a d.c. motor wherein both the armature and field windings are adapted for independent rotation about a common axis. The field winding is coup... | 06/30/1981 |
| 4109799 | Skyline logging carriage A skyline logging carriage wherein the winch drum around which the load line is wound is powered by a fluid motor through a worm gear arrangement which eliminates the need for a separate braking system. The fluid motor is driven by a fluid pump powered by... | 08/29/1978 |
| 4109798 | Crane having overload release means A crane having a hoist winch with a hoist cable connected to a link which parts at a predetermined tension, and a jib over which the hoist cable is reeved for connection to a load. A derricking system on the crane includes a derricking winch and a derrick... | 08/29/1978 |
| 4103873 | Overload protection apparatus for hoisting machine The disclosure relates to an overload protection apparatus for hoisting machines such as rope hoists or chain blocks. One gear incorporated in the reduction gear train of the hoisting machine is composed of an outer and an inner gear units between which t... | 08/01/1978 |
| 4070981 | Mooring system for floating drilling vessels A mooring system is disclosed for maintaining a ship shape drilling vessel within alignment limits and for warping it into the sea while drilling a well from the vessel in the sub-surface ground below it. The mooring system absorbs all of the forces on th... | 01/31/1978 |
