Abstract: A system and method for transferring tubular elements may include a first structure having a first horizontal platform attached to the first structure on a bottom side and a monorail attached to the first structure on a top side, a second structure having a second horizontal platform attached to the second structure. The first structure and the second structure may be located proximate to each other, while the monorail can extend from the first structure to the second structure. The monorail can have a motion controlled assembly to move a tubular element or assembly of tubular elements.

Abstract: An offshore vessel for performing offshore subsea wellbore related activities, for example for drilling a subsea wellbore includes a drilling tower. A method for drilling a subsea wellbore includes using an offshore vessel and a method for tripping a tubulars string is disclosed. The offshore vessel is provided with a hoisting system which has a first configuration, wherein a hoisting cable is connected to a working deck and a second configuration wherein said hoisting cable is connected to a traveling block. The system allows for efficient tripping in and tripping out.

Abstract: A sheet-metal spinning cutter bar assembly includes a cutter bar body. One end of the cutter bar body is provided is provided with a pulley through a screw. The cutter bar body includes a bearing seat. Two ends of the bearing seat are respectively provided with bearings. A mandrel is inserted into the bearing seat, and a tail end of the mandrel is connected with the pulley. The pulley is provided with a plurality of sets of lightening holes. A fixing plate and a supporting plate are arranged on the bearing seat, which are connected by interference fit and welding, and are provided with reinforcing ribs. A processing method of the sheet-metal spinning cutter bar assembly is also provided.

Abstract: Disclosed are a winch, a rope guide, and a transmission device having a clutch function. The winch includes a base seat, a reel, a rope guide, a transmission assembly, and a motor. The reel is rotatably provided to the base seat. The rope guide is provided to the base seat. The transmission assembly is connected with the rope guide. The motor is connected with the reel to drive the reel to rotate, and the motor drives the rope guide through the transmission assembly. In the winch according to embodiments of the present disclosure, the rope guide is an active rope guide, bringing about a good rope guiding effect. Moreover, the reel and the rope guide are driven by the same motor, which reduces the number of components and parts, simplifies the structure and control, and lowers costs.

Abstract: This is achieved according to the present invention by a torque/power transfer device comprising a main frame, a driving member (2), a driven member (3), and at least two pulley systems. Each pulley system comprises at least one stationary pulley (11a, 11b), which is stationary relative to the main frame, at least one movable pulley, which is movable relative to the main frame, a first wire connected to the driving member (2) and running over the at least one stationary pulley and the at least one movable pulley and a second wire operatively connected to the at least one movable pulley at one end and to the driven member (3) at its other end, wherein the second wire is running via a stationary regulator. The first wire of each pulley system is connected to a common point of the driving member and the second wire of each pulley system is operatively connected to a common eccentric point of the driving member.

Abstract: A vertically moving device includes a spool mechanism for spooling at least two wires that are fed out to form loops and a vertically movable platform suspended by looped portions of the at least two wires fed out from the spool mechanism. The vertically movable platform includes at least four wire-guiding rotating bodies over which the looped portions of the wires are run.

Abstract: A multi purpose hoisting device for use on a floating vessel having a deck, including: a load bearing structure to be mounted on the vessel; a main hoisting mechanism for raising/lowering an object above the deck and including: at least one main hoisting winch; an upper cable pulley block supported by the load bearing structure; a travelling cable pulley block; a main hoisting cable associated with the at least one main hoisting winch and passed over pulleys of the upper cable pulley block and of the travelling pulley block in a multiple fall configuration, such that the travelling cable pulley block is moveable relative to the load bearing structure by using the at least one main hoisting winch; a main hoist heave compensation mechanism associated with the main hoisting cable for damping the effect of sea-state induced motion of the vessel onto an object supported by the main hoisting cable.

Abstract: A portable crane for installing and removing windows. The portable crane for installing and removing windows includes a wheeled base with a platform having front and rear ends; a boom support assembly removably fastened to the wheeled base; and a boom assembly supported by the boom support assembly.

Abstract: Disclosed herein is an apparatus for cable management synchronized with telescopic motion. The apparatus is configured such that cables for transmitting power or signals to a manipulator provided on a lower end of a telescopic tube and for receiving signals therefrom are wound or unwound in response to expansion or contraction of the telescopic tube. Moreover, the apparatus is configured such that the cables are prevented from being displaced from the correct positions, a noise is prevented from being generated, and the tension of each cable is adjusted even when it is in the clamped state.

Abstract: A hoist system comprises a first line (112) and a first pulley (114), the first line extending around the first pulley to provide for raising and lowering a load attached to the first line and further comprises a second line (111) and a second pulley (113), the second line extending around the second pulley, the first pulley being suspended on the second line.

Abstract: A winch with adjustable arms allowing the length to be adjusted. The winch can have a very thin drum to allow it to fit in confined spaces.

Abstract: A lifting reel with a four-line wire structure includes a fixed body fixed to a ceiling of a structure, first and second drums installed to the body at a predetermined interval and rotated by a driving motor, wires respectively connected to the first and second drums, and first, second, third and fourth guide rollers arranged on a top of a lifting body at regular intervals and suspended on the wires to form a four-line wire. A wire-twisting prevention device is installed between an end of the wire connected to the first drum and an end of the wire connected to the second drum so as to connect both wires with each other. The wire-twisting prevention device includes bearings installed to the ends of the wires to be rotatable, respectively. The bearings prevent the wires from being twisted while the wires are wound around or unwound from the drums.

Abstract: A winch with adjustable arms allowing the length to be adjusted. The winch can have a very thin drum to allow it to fit in confined spaces.

Abstract: A hoist system includes a drive system and a shaft in rotatable connection with the drive system. The hoist system also includes a flexible first hoist member operatively connected to the shaft at a first longitudinal position thereon so that it can be wound around the shaft or unwound from around the shaft upon rotation of the shaft. The first hoist member extends from the shaft in a first direction. The hoist system also includes at least a second flexible hoist member operatively connected to the shaft at the first longitudinal position so that it can be wound around the shaft or unwound from around the shaft upon rotation of the shaft. The second hoist member extends from the shaft in a second direction, different from the first direction, so that the first hoist member and the second hoist member are wound around the shaft upon rotation of the shaft in a first or forward direction and are unwound from around the shaft upon rotation of the shaft in a second or reverse direction.

Abstract: A winch with adjustable arms allowing the length to be adjusted. The winch can have a very thin drum to allow it to fit in confined spaces.

Abstract: A lifting device comprises at least two multi-stage masts and a cable mechanism. Each multi-stage mast comprises a first length and a second length that is longer than the first length. Each multi-stage mast further comprises a plurality of stages, such that at least one stage of a mast is vertically movable with respect to at least one other stage. The cable mechanism comprises a spool and at least one cable that is coupled to the spool and arranged with respect to the multi-stage masts so that when each cable is wound onto the spool, each mast simultaneously and in unison changes length in a direction from the first length to the second length, and when each cable is unwound off the spool, each mast changes length simultaneously and in unison in a direction from the second length to the first length.

Abstract: An apparatus is disclosed for tensioning lines of a winch having a reel and three lines wound about the reel. The apparatus is used to position an object on a support. The first and second lines are wound about the reel in a first direction and the third line is wound about the reel in a second direction opposite the first direction. The first line extends around the first guide, the second line extends around the second guide, and the third line extends between the first and second guides. All three lines are connected to each other and to the object at their distal ends. An inner frame and an outer frame each contact the first and second lines. At least one of the inner frame and outer frame moves with respect to the other of the inner and outer frame to maintain tension in the first and second lines.

Abstract: A hoist device adaptable to lift or pull load material of various types. The hoist device is attachable to the trailer hitch of a vehicle and comprises a telescopic boom of a pair of rectangular tubular members attachable slidably to a base support member. In adjacent position on the base support is a control post member to which other components are attached, including a motor-driven winch positionable on the upright end thereof. A lifting component is attachable to the end of the boom member to be able to rotate easily, in any direction, since the angular movement of the boom member is always only one direction in regard to the axis of the boom member. A cable is used to operate the movement of the boom member, and has one end attached to the winch and a second end attached to a rigid component on the boom member after engaging pulley means on the boom member or control post member as chosen to provide suitable angular orientation of the boom member and telescopic extension of the boom member.

Abstract: An opposed-rope driven telescoping mast assembly includes a stationary support and a longitudinal mast comprising a longitudinal section joined to move relative to the stationary support. A drive assembly drives the longitudinal mast and includes a frame and a rotatable drum assembly mounted to the frame. A first rope is joined to the drum assembly and to the longitudinal mast to pull the longitudinal section in a first direction, while a second rope is joined to the drum assembly and to the longitudinal mast to pull the longitudinal section in a second direction. A sensor is operably coupled to the drive assembly to sense overload tension in the first rope or the second rope.

Abstract: An apparatus is disclosed for tensioning lines of a winch having a reel and three lines wound about the reel. The apparatus is used to position an object on a support. The first and second lines are wound about the reel in a first direction and the third line is wound about the reel in a second direction opposite the first direction. The first line extends around the first guide, the second line extends around the second guide, and the third line extends between the first and second guides. All three lines are connected to each other and to the object at their distal ends. An inner frame and an outer frame each contact the first and second lines. The inner frame and the outer frame are movable with respect to each other to maintain tension in the first and second lines.

Abstract: A mounting and lowering system for supporting one or more luminaires or similar devices having use within an indoor space or similarly configured space such as an open-air pavilion or the like, the system comprising a support assembly capable of being raised and lowered above a location within such a space not conveniently available for use in the servicing of luminaires or devices mounted by the system. The present system includes a latching mechanism permitting remote latching and unlatching of the support assembly. Vertical displacement of the support assembly can be effected without power interruption. Primary drive components are positioned within the system to facilitate service and replacement. The invention further contemplates transition apparatus capable of use in indoor spaces having differing ceiling angles.

Abstract: A load hoisting system for raising and lowering a load. A first line supports a rigid beam with unequal mechanical advantages on either side of the load. A second line supports the same rigid beam with mechanical advantages on either side of the load that are, in total, equal to those on the first line but with a ratio of mechanical advantages unequal to the ratio of mechanical advantages of the first line. One end of each line is fastened to a fixed support and the other ends of the two lines are drawn at the same rate by a power source, which system eliminates all axial rotation of the beam. The system may be applied to both ends of a long load by drawing of all lines in synchronism, advantageously being applied to lift both ends of a boat.

Abstract: A load equalizing rope termination serves to prevent a load imbalance between a pair of rope leads of a rope termination. The rope termination includes an end section such as an end loop and the pair of rope leads attached to a pair of rope ends. A rope termination fitting includes a base support member over which the end section is supported, and a pair of load equalizing support members disposed upstream of the base support member and over which the rope ends are supported. The engagement between the rope ends and the equalizing support members prevents a load imbalance of the rope leads.

Abstract: The invention is a hoist system for a derrick with a derrick inside, a derrick outside, and a derrick top side; a splittable block connected to the derrick top side; a hoisting cable guided through the splittable block; a moveable trolley with a trolley top side and a trolley bottom side, wherein the trolley is connected to the splittable block and wherein the moveable trolley is removably secured on the derrick; and a hoist winch adapted to pull the hoisting cable over the derrick top side and through the splittable block to move the moveable trolley relative to the derrick.

Abstract: The invention is a hoisting device for a vessel a base structure provided with fixed cable blocks with pulleys; a trolley connected to a cable pulley block and a mechanism for gripping a load; a compensator a hoisting mechanism with a hoisting cable and a winch, wherein the hoisting cable is guided over the cable pulleys connected to the base structure and is adapted to move the trolley relative to the base structure with the aid of the winch; a secondary compensator with fixed cable blocks and pulleys connected to the base; a cable pulley set connected to the compensator end; a connection cable connected to a stationary section and a movable cable block with pulleys; a hoist connected to the vessel; a connecting cable guided over pulleys; and movable cable block and is adapted to move the compensator second end with the aid of the secondary hoisting mechanism.

Abstract: Apparatus and method are provided for lifting heavy loads beneath the floor of a drilling rig or a platform. A base skid supports tables to which winch bases are attached. Winches, usually four in number, are placed on the winch bases and the cables of the winches are placed through sheaves and attached to a double line bar. Sheaves are attached to a load, such as a blowout preventer. Cradle lines may support a blowout preventer. Load cells may be used with the winch cables.

Abstract: The suspension and hoisting system for a load support comprises two cable circuits, each comprising a cable (C1, C2) fixed at one of the ends thereof to a fixed point (Pf1, Pf2) and at the other end to a lifting apparatus (T1, T2) and being reeved around deflection pulleys (A1, A2, A3, B1, B2, B3) mounted on two parallel shafts (Ax) located adjacent one and the other end, respectively, of the load support, the lifting apparatus (T1) of one of the two cable circuits being provided above one of the ends of the load support and the lifting apparatus (T2) of the other cable circuit being provided above the other end of the load support.

Abstract: A lifting arrangement for overhead traveling cranes. The lifting arrangement includes two single reeved drums that are reeved together to provide true vertical lift of a load. The lifting arrangement allows for equalization of full up and full down rope fleet angles through utilization of axially staggered dual drums and/or a bottom block with two separate sheave nests. The lifting arrangement may utilize commercially available components to reduce the overall cost of the crane when compared with other powerhouse crane designs.

Abstract: A multi-block rigging system for a heavy crane, pulling or lifting device. The system uses sheave blocks in series orientation to enable the use of standard, economical or preferred, size winch drums and standard, economical or preferred, diameter and length wire rope, each forming a separate set of reeving lines. Each set of reeving lines moves its corresponding load block a proportional distance of the total travel length for the load hook. Alternatively, different line parts of line for each reeved set enables different travel speeds of the load block for different capacity requirements.

Abstract: The invention is a hoisting device for a vessel with a mast in the form of a tube or sleeve with fixed cable blocks on the top side, a trolley with moveable pulleys, a feature on the bottom side for gripping a load, a hoisting system with at least a hoisting cable and a winch, wherein the hoisting cable is guided over the cable blocks and pulleys of both the mast and the trolley in order to move the trolley relative to the mast with the aid of the hoisting system, and a compensator located in the mast in the form of a pneumatic or hydraulic cylinder for damping movements of the vessel as a result of heave and beating of the waves characterized in that the hoisting cable is guided over cable pulleys that are connected to the ends of the compensator.

Abstract: A shock absorbing device is provided for use on a hoist of the type generally used for safety of personnel entering a manhole or the like which has a base for mounting on a support surface at the hole and a jib portion. A winch is mounted at one position on the hoist for paying out and pulling in a first cable which passes over the jib portion to a pulley at the jib end. A fall restraint device with a second cable is mounted at a different location on the host with the second cable extending upwardly from the hoist to a second pulley at the jib end. The shock absorbing device for the pulleys includes a common mounting member pivotally attached to the mounting element at the jib end for pivotal movement relative thereto about a horizontal axis with a shock absorbing brake arranged to resist said pivotal movement up to a predetermined load limit such that a downward shock force from the load on at least one of the first and second pulleys causes the common member to pivot downwardly in a shock absorbing action.

Abstract: Winch apparatus for raising and holding a rolling steel door includes a wheeled base with telescoping members extending upwardly from the base. A hand cranked winch raises and lowers the telescoping members, while a reversible electric motor is used to power a separate winch for raising and lowering a load secured to an arm extending outwardly from an innermost telescoping member. The arm is disposed against a building when the apparatus is in position to raise the rolling steel door for its installation.

Abstract: A pulling apparatus includes a frame having a securing stirrup for securing a beam. The beam is provided at one end with a return pulley. Due to the structure of the securing stirrup, the tractive forces are transferred completely to the beam and the frame so that the means for securing the apparatus to the ground can be minimized. Such a design easily allows the beam to be set at an angle when the pipe is off center. The apparatus may also be easily placed in a cable chamber for operation.

Abstract: A lifting apparatus for lifting a heavy object. The lifting apparatus including a frame assembly having a pair of side beams spaced parallel to one another. A sliding sheave assembly is mounted to the frame assembly. The sliding sheave assembly is positioned between the pair of side beams. The sliding sheave assembly has a first shaft with a plurality of first sheaves mounted thereto and a second shaft with a plurality of second sheaves mounted thereto. The first and second shafts are separated by a distance which can be varied A cylinder has a first end connected to the frame assembly and a rod end attached to the sliding sheave assembly. The cylinder rod end is capable of moving longitudinally relative to the first end to hereby alter the distance between the first and second shafts. A cable having first and second ends attached to the frame assembly is reeved between the pluralities of first and second sheaves.

Abstract: A deep water lowering apparatus that utilizes dual davit structures mounted on a barge. Each davit structure has a pulling wire rope line spooled on a storage winch. Each pulling line is reeved onto a traction winch and through upper and lower sheaves on the davit structure. Corresponding ends of each pulling line are connected together on an equalizer beam. An adaptor box is suspended from a spreader bar provided with a dog leg center portion for effecting the load transfer from the crane. The lowering tool that supports the load is directly received in the adaptor box and transfers the load to the lowering apparatus without the need for rigging work.

Abstract: A rope guide for a winch, especially for hoisting gear, with a winding drum which has rope grooves running in opposite directions, including guide means which are provided for the alignment of at least a pair of rope lines and connected with one another via coupling means so as to run in opposite directions. The guide means include guide elements and are drivable by the rope lines, which can be wound on or wound off the winding drum. To facilitate a gentle winding on and winding off of the rope in a compact constructional form which is robust, resistant to impact and maintenance-free, each guide element comprises a rope guide channel which is formed in a channel support and which has, in a first plane disposed at a right angle to the axis of rotation of the winding drum and in a second plane disposed parallel to the axis of rotation of the winding drum, an input contact portion, for a rope and an oppositely located output contact portion for the rope.

Abstract: A rope guide for a winch including a rotatably supported winding drum defining an axis of rotation and having helical cable or rope grooves defined about the drum periphery and which spiral inward from the drum distal edges toward the drum center. Two guide elements are provided to align a corresponding pair of rope lines as the lines are wound onto and from the rotating winding drum. Coupling means affixed to the guide elements movably connect the guide elements for movement along the tracks of an elongated rail and parallel to the axis of rotation of the winding drum as the rope lines are wound onto and from the drum. The coupling means are constructed as longitudinal coupling supports that are concurrently movable in opposite directions longitudinally along the rail and are guided in the respective tracks and supported at at least two spaced apart points. The combination of each longitudinal coupling support and guide element is preferably guided and supported via the guide element in different tracks.

Abstract: A dual draw works hoisting apparatus. A single derrick structure is provided for two drilling rigs. The crown block platform receives the crown blocks for both drilling operations such that both crown blocks are slidable along the crown block platform. The hoisting lines are reaved in a conventional manner, except for the dead lines. The dead lines from the two crown blocks are connected together by means of a sheave assembly which is locked in position during normal independent operation of the crown blocks and their respective travelling blocks. To provide increased lifting capacity for lifting the drilling riser, the crown blocks are moved closer together on the platform such that the travelling blocks may be attached to a spreader bar to be positioned above a drill slot and attached to the drilling riser. The sheave assembly connecting the two deadlines is unlocked to allow relative movement between the two deadlines during simultaneous use of the draw works for both travelling blocks.

Abstract: The disclosure involves a crane having a main hoist drum and an auxiliary hoist drum for handling a load under normal and emergency (the latter actual or simulated) conditions, respectively. The latter condition involves a main hoist which is inoperative because of a failure or by intent. The auxiliary hoist drum is wrapped with about twice the length of cable as the main drum and can move the load up or down, irrespective of load position if and when the main hoist becomes inoperative. Also disclosed is a novel method for moving a load. Steps include maintaining one drum in a non-rotating mode and rotating the other drum. An improved crane load block is also disclosed to have "floating sheaves" which help prevent excessive fleet angles.

Abstract: An improved method and system for a liftcrane in which a load is lifted through the combined action of first and second hoist drums. The method and system use a first rope wound on one hoist drum and a second rope wound on the second hoist drum. The ends of the ropes opposite the hoist drums are linked together to transmit tension between them. The load is coupled to the ropes. If the take up speed of one of the ropes exceeds the take up speed of the other, the linked ends of the ropes will shift. This condition is detected and the operation of at least one of the first and second hoist drums is modified to bring the take up rates into balance. This system is advantageously used with a hoist block sheave arrangement. This system can also be used with a single rope in which each of the ends of the single rope are wound on a separate one of the hoist drums and the load is coupled to the middle of the rope.

Abstract: A load-hoisting system comprising a motor and gear box unit having the parallel outlet gears. Each outlet gear drives a hoisting device connected to the load by a cable, such a device comprising a toothed disk meshing with one of the two outlet gears, the toothed disk driving a winch drum via a friction clutch comprising an intermediate clutch disk, the cable being attached to and wound on the drum, the intermediate disk including retaining catches preventing it from rotating in a direction corresponding to lowering the load, the drum being fixed to a central shaft whose rotation in the direction corresponding to lowering the load ensures that the clutch is engaged. The central shaft is synchronized in rotation with the central shaft of the other hoisting device by means of a plate coupling and a coupling disk provided with tenons or grooves that are orthogonal, the two central shafts being supported by a fixed frame.

Abstract: A crane and lift apparatus for controlling the lifting and lowering of large cargo containers. A trolley assembly includes a hoist drum from which is suspended a system of cable or rope reevings connected to material securing assembly. The apparatus is effective to unload containers stacked one above another from one location to an alternate location. The system of cable reevings permits the raising and lowering of containers in planes defined by X, Y, and Z axes. The cables are deployed from the hoist drum on the trolley assembly to sheaves disposed at the four corners of the material securing assembly and then returned to anchor assemblies secured to an undercarriage of the trolley assembly. The sheaves are selectively angled and located in headblock assemblies positioned on the material securing assembly. A system of brakes controls movement of the cables through the sheaves.

Abstract: A boat support framework including an elevating cradle supported between a plurality of cable and pulley containing lift towers via a plurality of roller bearings in engagement therewith. A cable take up axle includes separate cable drums and cables to each lift tower and is controlled from a handwheel or winch operated articulating drive arm and multiple endless chains coupled therebetween. Hinged frameworks pivotally coupled to cross frame members of a base frame and the cradle articulate to support the cradle over the range of lift travel.

Abstract: A hoisting device comprises a cable controlled at one end by a conventional crane winch assembly and at the other end by a traction winch assembly comprising traction device and storage winch. The hook is raised and lowered using the crane winch assembly and/or traction winch assembly depending upon whether the operation requires critical control or long haul travel.

Abstract: A reeving apparatus for a crane hoist is disclosed as having an overhead frame, a lifting beam positioned below the frame and carrying a plurality of rotatable lifting beam sheaves, and load carrying means suspended from the lifting beam. A plurality of ropes are also provided for supporting the lifting beam and load carrying means with each one of the plurality of ropes being wrapped around at least one of the plurality of lifting beam sheaves. A pair of rotatable drums are mounted on the overhead frame with the first drum being connected to the plurality of ropes for raising and lowering the lifting beam and the second drum also being connected to the plurality of ropes for raising and lowering the lifting beam. Although both drums are connected to the plurality of ropes, they are operable independently of each other to raise and lower the lifting beam in the event of inoperability of either drum.

Abstract: A winch having a pair of first and second cylindrical drums; a drive to simultaneously axially rotate the drum; a reciprocating bracket which travels substantially axially parallel to the drums when the drums rotate; the bracket having a pair of spaced apart first and second rope guides; the first guide being capable of receiving a rope being level wound on, or unwound from, the first drum; and the second guide being capable of receiving a rope being level wound on, or unwound from, the second drum.

Abstract: An integrated winch and windlass for hauling in and paying out a mooring line which consists of wire rope serially connected to chain cable is described. The integrated system has a pair of traction winch drums for conveying the wire rope, and a chain wheel for conveying the chain cable. The chain wheel is coaxially mounted with one traction winch drum, and has a wire rope groove with a groove diameter substantially the same as that of the traction winch drums. A sheave directs wire rope between one of the drums and the chain wheel, and is so positioned that a wrap of wire rope is formed about the chain wheel whenever the system is operating on wire rope exclusively. A drive mechanism is provided for rotating the traction winch drums and chain wheel, including a common drive shaft, and a clutch mechanism which permits the traction winch drums and the chain wheel to be located simultaneously or separately.

Abstract: An elevator system has a selector mechanism driven by a cable loop attached to the elevator car. The opposite cable ends are wound on a take-up drum, in opposite rotational directions, in sequential rows across the drum, such that the cable leads travel back and forth across the drum as the drum rotates. A selector cable guide includes a frame pivotable about an axis generally perpendicular to the drum axis. The frame is disposed about the drum, and has a pair of pulleys mounted adjacent to the pivot axis, and a second pair of pulleys mounted to the frame on the opposite side of the drum. Each cable portion is guided about one of the first pulleys, thereafter about one of the second pulleys, and is thereafter wrapped onto the drum. The second pulleys swing laterally to follow the position of the cable leads as they travel across the drum, whereas the first pulleys remain relatively stationary for directing the cable portions up and down the elevator shaft from a relatively constant position.

Abstract: A drum hoist or winch in which at least one circular cam lobe mounted eccentrically on an axle overlapping the axle is interconnected with a like circular cam lobe mounted on a second axle by inboard linkage whereby rotation of one axle will rotate the other axle in unison. A hoist drum mounted concentrically with at least one of the axles can thus be rotated in unison with the other axle to wind or unwind one or more cables thereon.A preferred embodiment has three circular cam lobes mounted eccentrically on each axle 120.degree. angularly out of phase with each other with an inboard link plate interconnecting a cam lobe on each axle in rotatable relation.A brake mechanism mounted on an axle has components normally frictionally engaged which rotate as a unit. Sliding frictional motion to slow down and positively brake the hoist to a stop is provided only when rotary speed of the axle exceeds a predetermined speed.

Abstract: 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. The strap passes around the pulleys of a pulley-block comprising an upper block mounted on the frame of the tackle to pivot about a horizontal axis X-X, and a lower block suspended from the strap or braid and carrying the hook.