3673 results about "Block and tackle" patented technology

An orthotic trauma device is provided including an elongated orthosis body adapted to be wrapped around a portion of a body of a wearer of the device, the orthosis body being formed of a pliant material which is adapted to be easily cut with cloth-cutting scissors; a detachable fastening device provided at distal ends of the elongated orthosis body to releasably secure the distal ends to one another; and means for adjusting the tightness of the orthosis body operatively associated with the detachable fastening device. A pulley system for use in an orthotic device is also provided including a pair of pulley banks arranged in juxtaposed relationship, a first bank of which is adapted to be detachably disposed on a first distal end of an elongated orthosis body and a second bank of pulleys adapted to be detachably disposed on a second distal end of the elongated orthosis body; and a cable interconnecting the two pulley banks and running through a pulley on each of the pulley banks in alteration, such that shortening of the cable pulling the pulley banks together and tightening the orthotic device with the aid of a mechanical advantage dependent upon the number of pulleys mounted on each of the pulley banks.

A cruciform anterior spinal hyperextension orthosis comprising a front portion having a rigid anterior cruciform brace assembly provided with movable upper and lower arms extending therefrom and arranged vertically, two laterally disposed movable arms extending therefrom horizontally, and body contact pads rotatably secured to the free ends of each of the upper and lower vertically disposed arms. A rear portion is provided adjustably secured to the front portion and having a paraspinal support formed in two juxtaposed segments, a pulley system comprising at least one pulley set having two pulley banks each having a plurality of pulleys, each bank disposed proximate to an adjacent edge of the juxtaposed segment, and a cable running through each pulley of each bank of pulleys in the set in alteration and in series and linking together each of the two juxtaposed segments. Adjustable mechanism for securing the front portion to the rear portion including: two straps, respectively removably attached to lateral edges of the two juxtaposed segments and adapted to be secured to two strap engaging devices, respectively, attached to each of the laterally disposed movable arms.

A highly versatile exercise apparatuses is disclosed. More particularly, the invention relates to a cable crossover exercise apparatus including a central weight stack and opposed extension arms. The invention also relates to a functional lift exercise apparatus including a central weight stack and substantially parallel extension arms. The invention further relates to a cable type exercise apparatus employing a pulley assembly with a 4:1 load ratio.

An exercise apparatus includes a compact resistance unit that houses a pneumatic cylinder. The cylinder is connected to a pulley wheel that moves at least toward the cylinder. A main cable extends about a portion of the pulley wheel. One end of the main cable is fixed to the unit housing and the other end is attached to a pulley block of a block-and-tackle mechanism. A user cable extends through the block-and-tackle mechanism and is connected to a handle. The pneumatic cylinder resists movement of the handle away from the unit.

An exercise apparatus includes a compact resistance unit that houses a pneumatic cylinder. The cylinder is connected to a pulley wheel that moves at least toward the cylinder. A main cable extends about a portion of the pulley wheel. One end of the main cable is fixed to the unit housing and the other end is attached to a pulley block of a block-and-tackle mechanism. A user cable extends through the block-and-tackle mechanism and is connected to a handle. The pneumatic cylinder resists movement of the handle away from the unit.

A sealing device incorporating a block and tackle for assisting in sealing an internal tissue puncture with an internal and external component. The block and tackle provides a mechanical advantage multiplying an initial force to facilitate compression of the internal and external component together across the internal tissue puncture. The internal and external components may be an anchor and collagen sponge, respectively. The internal tissue puncture is generally an arteriotomy intentionally created in order to perform a vascular procedure. The ability to exert a greater compression force across the arteriotomy eliminates a tamping tube common to prior internal tissue puncture closure devices, and also eliminates additional steps heretofore common to sealing internal tissue punctures. The steps eliminated by application of the principles described herein include tamping the collagen sponge, attaching a tamping spring between a tamping tube and a filament connecting the anchor to the collagen sponge, and later removing the tamping spring.

Method and apparatus for making snow by generating water spray from a triple array of multiple nozzle sub-boom branch-pipes transversely protruding from the upper end of a main boom of a pivotably adjustable snow making pipe tower. Three air jet streams, one for each branch pipe, are simultaneously discharged under high pressure into and sequentially through the throats of each associated multiple stack of water sprays issuing from each set of branch pipe nozzles to thereby form multiple spray plumes of atomized and seeded water all directed forwardly from the upper end of the tower pipe. The water pipe may be an elliptical aluminum extrusion with two interior air tubes respectively controllably feeding large and small diameter air jet arrays to thereby provide a range of air jet water spray interaction. The pipe tower may be pivotally raised and lowered by a block-and-tackle or chain fall type drive mechanism that may be recoupled to the tops of a lifting pole and tower pipe for bodily raising the entire tower pipe and its support pipe telescopically on a ground support pole. Spreader-supported guy wires may be used to brace the tower pipe and also provide an electrical deicing circuit. Air jet control, blow-out valving and water drain conduit arrangements are disclosed, and also universally adjustable ground support systems for the pipe tower, including an underground-fed combined telescopic hydraulic ram forming air and water conduits.

A planter system includes an adjustable height and angular orientation planter and an optionally adjustable irrigation system for controllably supplying water to the planter and / or surrounding terrain. The planter is configured to controllably travel up and down a vertical support, such as a section of a planter pole or other suitable vertical support structure, from a highest to a lowest position using a pulley and winch, block and tackle, rotating shaft, continuous pulley driven belt, continuous sprocket driven chain, lead screw, ball screw, a ballast, hydraulics, pneumatics, spring or other lifting subsystem. The irrigation system may be configured to supply water to the planter and or to the surrounding terrain. The planter is carried along the pole, allowing it to be controllably rotated at any height along the travel.

A field circulatory constriction device suitable for self-application by an injured person in order to stop arterial blood loss in an injured limb includes a strap and a latch for coupling the strap around the limb. A buckle is provided for cinching the coupled strap to the limb and a block and tackle mechanism is provided for increasing the pressure of the cinch strap onto the limb.

A cordless window blind structure is provided. A movable seat having a pulley block and a cord-winding assembly is disposed within a head rail of the cordless blind. The pulley block is connected to a lift cord wound through a first positioning element, so as to control the opening and closing of a blind body. And the cord-winding assembly has a cord winder attached to one end of a retrieving cord and a torsion spring. The other end of the retrieving cord is fastened either on the head rail, the movable seat, a second positioning element, or an end cap. The structure of the second positioning element is resembled to the first positioning element. By taking one end of the retrieving cord as a pivot, the movable seat moves laterally therealong the head rail by a restoring force generated through the torsion spring.

A fall restraint system having a retractor assembly including a housing assembly that is mounted onto an aerial apparatus. A base pulley assembly is also mounted onto the aerial apparatus. A cable having first and second ends is partially stored within the housing assembly, whereby the first end is fixed within the housing assembly. The second end is threaded around the base pulley assembly and is also fixed onto the aerial apparatus. Tensioning means keep a predetermined tension on the cable while the aerial apparatus extends from a retracted position to an extended position and vice-versa.

The invention discloses a variable counterweight elevator and a variable counterweight hydraulic elevator and is designed for solving the problems of counterweight balance, high energy consumption and the like of the conventional elevator. The variable counterweight elevator comprises a traction electromotor, an elevator box arranged in an elevator well, a pulley block, a counterweight and a traction rope which connects the elevator box and the counterweight and passes through the pulley block, wherein the counterweight consists of at least two counter weight blocks; at least one group of counter weight adjusting manipulators are fixedly arranged in the elevator well; and control instrument input ends of the counter weight adjusting manipulators are connected with a control device which controls the counter weight adjusting manipulators to be clamped with the counter weight blocks. The variable counterweight elevator and the variable counterweight hydraulic elevator can correspondingly change the weight of the counterweight according to the weight of passengers and goods in the elevator box and have low electric power consumption.

A modular harness assembly worn by a person during physical exercise or rehabilitation. The modular harness assembly includes a non-stretchable waist belt that is secured around the waist of the patient or user, and can be associated with one or more auxiliary, non-stretchable harness component that can easily be added or removed from the waist belt. The auxiliary harness components can include a shoulder harness, a thigh harness having a movable connection to the waist belt proximate the hip joint, and a pelvic harness. The modular harness assembly can be used in combination with a hoisting system such as a block and tackle pulley system that is mounted onto a rolling carriage and an overhead rail.

The invention discloses a folded launching and withdrawing device for an unmanned aerial vehicle. The folded launching and withdrawing device comprises a base, a folded beam, a launching frame, a launching air cylinder, a traction cable, winch rollers and a pulley set. The tail end of the folded beam is hinged to the base, and the launching air cylinder is fixedly arranged at the end of an inner cavity of the folded beam. The two winch rollers are arranged at the end of the folded beam. The two ends of the traction cable connected with the launching frame are connected with the two winch rollers respectively in a winding mode along a traction line formed by the pulley set. The folded launching and withdrawing device is easy to store and hide after being folded, and is convenient to carry and transport flexibly, a slide is long after unfolding, launching force is large, high controllability is achieved, launching and withdrawing are integrated, fast and continuous launching and withdrawing cross work can be carried out, the large launching type application range is achieved, the device adapts to all carrier-based and vehicle-mounted maneuvering modes, operating can be maintained through a low-power fuel engine or motor, and other guarantees are not needed.

The invention discloses a spreader stabilizing mechanism of a container gantry crane, comprising a drum group, a pulley block, a spreader upper frame and a steel wire rope group wound on the drum group and the pulley block; the steel wire rope forms four congruent inverse triangles at the space between the spreader upper frame and a pulley frame; the bottom points of the four inverse triangles are distributed at the four corners of the spreader upper frame symmetrically; included angles which are formed by the planes of the four inverse triangles and the moving direction of a cart and a trolley are all acute angles. Therefore, in the moving direction of the cart and the trolley, the motion damping of the four space triangles exists, thus reducing the swing of the spreader; when the load of the spreader is not balance and the swing of opposite angles is generated, namely, twisting and vibration are generated, the space triangle forms the motion damping in the diagonal direction of the upper surface of the spreader upper frame and forms damping component in three directions of the space, thus offsetting the swing of the opposite angles. The invention has simple structure, convenient maintenance and use and high safe reliability.

The invention discloses a protective device of an elevating mechanism of a stacker-reclaimer, which aims at overcoming the shortcomings that a bucket wheel of the traditional stacker-reclaimer makes an elevating motion by using only one wire rope, and the sudden fracture of the wire rope can easily cause safety accidents to people or the device, influence the regular production and increase the repair cost. In the invention, the elevating mechanism is provided with two parallel wire ropes, the top of a stand column and a bucket wheel arm support are respectively provided with two parallel sets of pulley blocks corresponding to the wire ropes, wherein the head ends of the wire ropes are respectively fixed on two coaxial rollers of a hoister, the tail ends of the wire ropes are fixed on a hoister platform, and a balancing device which is connected with the tail ends of the two wire ropes is installed on the hoister platform. When one wire rope suddenly fractures, the other wire rope alone can maintain the balance of the bucket wheel arm support, can not cause damage to the stacker-reclaimer or result in personal safety accidents, and can gain time for the replacement of the wire rope, thereby greatly lowering the repair cost, and ensuring the safe and regular production.

The invention discloses a single-shaft pulling-pressing double-function creepmeter, which comprises a working platform, a pulling-pressing force loading system and a creep data measuring system. The working platform comprises a base, a first support rod assembly, a second support rod assembly, a press bearing plate, a pulling bearing plate, a working plate and a loading plate. The pulling-pressing force loading system comprises an oil drainage oil cylinder, a large-diameter oil cylinder and a small-diameter cylinder and further comprises a pulley weight loading device. The creep data measuring system comprises a strain sensor, a data collector and a microcomputer. The single-shaft pulling-pressing double-function creepmeter can be used for conducting both compression creep experiments andpulling creep experiments. The pulling-pressing force loading system can amplify weight loading load through a pulley block, and pressure can be amplified after being transferred to the large-diameter oil cylinder from the small-diameter oil cylinder, so that the loading force can meet requirements of a large mount of rocks for creep experiments. Simultaneously, the loading load is convenient to adjust and capable of maintaining constant for a long time. The creepmeter is high in measuring accuracy, low in manufacture cost and low in experiment cost due to the fact that the creepmeter consumes no electric energy in the experiment process.

The invention relates to a waterpower gravity type vertical ship lift. A ship chamber and a gravity water chamber are caused to be in butted joint by an assembly pulley and a steel cable winding system of a wound roll in the way of bilateral balance so as to cause the lifting points of the ship chamber and the gravity water chamber to be in mutual rigid connection, thereby benefiting the maintenance of favorable synchronization during up and down running. When the ship chamber needs to be descended, water in the gravity water chamber is discharged; and when the ship chamber needs to be lifted, water is added to the gravity water chamber. By changing the gravity difference of counterpoise on both sides, the abrasion resisting moment of the steel cable winding system is overcome, thereby causing a ship reception chamber to be moved up and down and realizing the navigable butted joint of upstream and downstream water levels. A method for adding water to the gravity water chamber is as follows: by enlarging the area of a feed water inlet, the flow of the water is decelerated, and the mode of multi-layer water supply is adopted so as to reduce the water supply drop height of the feed water inlet and the gravity water chamber. The water flows out from overflow pore plates of a water storage chamber in a way of overflow and then flows downwards into the gravity water chamber along water curtain wall plates.

The invention discloses a cargo grabbing device used for an industrial robot. The device comprises a supporting frame, a dual-shaft motor is arranged in the supporting frame, a first screw and a second screw are arranged on output shafts on the two sides of the dual-shaft motor, the first screw is sleeved with a first clamping plate, a limiting mechanism is arranged between the first clamping plate and a second clamping plate and the supporting frame, multiple through holes are formed in the bottoms in the first clamping plate and the second clamping plate, frame bodies are arranged on one sides of the first clamping plate and the second clamping plate, auxiliary clamping devices are arranged on the bottom ends in the frame bodies, driving motors are arranged on the top ends of one sides in the frame bodies, and the driving motors and the auxiliary clamping devices are in fit connection through pulley sets. The device has the beneficial effects that work is stable, in the grabbing process, cargos can be subjected to dual reinforcing, cargo falling is avoided, use is convenient, operation is easy, and work efficiency is high.

The invention discloses a quick replacement method for movable pulley blocks and wire ropes in cranes. The method includes: 1, lowering an old movable pulley block to a proper position; 2, cutting off an old wire rope and re-setting a wire rope; 3, welding the old wire rope; 4, firmly welding the end of the new wire rope to the end of the old wire rope; 5, positively rotating a reel to wind the wire ropes; 6, cutting off a soldering point; 7, removing the old wire rope thoroughly; and 8, using another lifting system to drive and lift the two ends of the new wire rope pulled to the movable pulley block to the reel, and pressing the two ends of the wire rope into a pressure plate to end the replacement process. The method has the advantages of labor saving, simplicity in operation, and high automation level.

The invention discloses a cable laying device. The cable laying device comprises a base, cable trays, a cable, a fixing frame, a guide support and a third pulley; three groups of universal wheels are distributed on each side below the base; two supporting columns are symmetrically arranged above the bilateral sides of the left end of the base respectively; supporting frames are fixedly arranged on the bilateral sides of the outer wall of each supporting column respectively; a hydraulic jack is fixedly arranged at the upper end of each supporting column; a supporting groove which is in a circular arc shape is fixedly formed above each hydraulic jack; a rotating shaft is arranged between the two supporting grooves in a straddled mode; the cable trays are arranged in the supporting grooves through the rotating shaft respectively; the upper end of the guide support is provided with a beam; an elastic guide device is fixed in the middle of the bottom surface of the beam; an elastic guide base, a first guide wheel and a spring are arranged in the elastic guide device. According to the cable laying device, the operation is simple, the use is convenient, the height of each cable supporting frame can be adjusted, the friction force in the movement process of the cable is reduced due to a pulley group, and accordingly the labor intensity of the construction personnel is reduced.

A sealing plug for a block-and-tackle balance comprises a sealing member having an outer periphery shaped so as to conform to an inner surface of a channel of a window jamb in which the block-and-tackle balance is accommodated. An opening is defined in the sealing member allowing a cord of the block-and-tackle balance to pass therethrough such that the cord is movable with a movement of a window panel. A connector configuration in the sealing member and allows the sealing member to be releasably secured to a bottom end of the block-and-tackle balance.

The invention relates to a portable powered rope climbing device, which can carry persons and objects to ascend or descend along a climbing rope, and ensure controllable speed. The invention comprises a battery pack, an electromagnetic brake direct current motor, an output shaft of the said motor is connected with an input shaft of a reducer. An output shaft of the reducer and the input shaft of the reducer are arranged in a 90-degree manner. A driving rope pulley is fixed to the output shaft of the reducer. A climbing rope is wound inside the driving rope pulley. A warping brake rope-pressing pulley block and rope-pressing pulleys tightly press the climbing rope. The climbing rope is wound between the driving rope pulley and a reversing rope pulley and is led out of the driving rope pulley. A speed control module is connected with the said motor.

A sealing device incorporating a block and tackle for assisting in sealing an internal tissue puncture with an internal and external component. The block and tackle provides a mechanical advantage multiplying an initial force to facilitate compression of the internal and external component together across the internal tissue puncture. The internal and external components may be an anchor and collagen sponge, respectively. The internal tissue puncture is generally an arteriotomy intentionally created in order to perform a vascular procedure. The ability to exert a greater compression force across the arteriotomy eliminates a tamping tube common to prior internal tissue puncture closure devices, and also eliminates additional steps heretofore common to sealing internal tissue punctures. The steps eliminated by application of the principles described herein include tamping the collagen sponge, attaching a tamping spring between a tamping tube and a filament connecting the anchor to the collagen sponge, and later removing the tamping spring.

An exercise resistance cable apparatus for engagement with a pulley assembly of a support structure and with a cable locking pin of an anchor assembly of the support structure. The exercise resistance cable apparatus includes an elastic exercise resistance cable. A cable anchor ring is securely connected to a first end of the elastic exercise resistance cable. A handgrip is connected to a second end of the elastic exercise resistance cable. During use the elastic exercise resistance cable is directed through an activity bay of the pulley assembly and ultimately attached, via the cable anchor ring, to the cable locking pin of the anchor assembly of the support structure. The exercise resistance cable apparatus is particularly adapted to be used with an exercise chair having a frame with pulley assemblies defining a plurality of activity bays positioned at desired locations thereon.

The invention discloses a marine drilling riser tensioning system which comprises a plurality of tensioner assemblies respectively arranged around a floating type drilling platform, wherein each tensioner assembly comprises a tensioning cylinder and an energy storage device, wherein the upper end and the lower end of the tensioning cylinder are respectively provided with an upper tackle block and a lower tackle block, the distance between the upper tackle block and the lower tackle block is changed with the flexibility of a piston; a lower cavity of the energy storage device is filled with a high-pressure liquid, an upper cavity of the energy storage device is filled with a high-pressure gas, the lower cavity of the energy storage device is communicated with a piston cavity of the tensioning cylinder, the upper cavity of the energy storage device is communicated with a high-pressure air system; and a steel rope sequentially bypasses through the upper tackle block and the lower tackle block and is connected with a connection device after guided by a guide pulley, and the connection device is connected with a tensioning ring hung on a riser system. The marine drilling riser tensioning system has the advantages of simple structure, convenience for control, reliability in control, low manufacture cost and large bearing capacity.

The invention discloses a quick replacement method of steel cables of a crane, which is used for replacing more than one steel cable wound on a movable pulley of gib head of the crane. The method comprises the following steps of: starting a reel of a crane needing to be replaced steel cables to reel off; lowering the gib head of the crane to a position being suitable for a welding operation and keeping the gib head of the crane still; cutting off an old steel cable at the outer most side of steel cables on movable pulley sets on the gib head by using an electric welding and welding the cable head of a new steel cable with the cable head of the cut off part of the old steel cable retained on the movable pulley sets; starting the reel of the crane to reel up so as to wind all the old steel cables welded together with the new steel cable onto the reel, and meanwhile, driving the new steel cable by the old steel cables to sequentially pass through pulley plates of each pulley set; and respectively fixing cable heads at both ends of the new steel cable with an appropriate length on corresponding positions of the reel of the crane. The method utilizes mechanical power to draw the old steel cables to drive the new steel cable so as to pass through the movable pulley plates, saves time and labor and is safe.

The invention relates to an insulator horizontal tensile testing machine, which comprises a working platform, wherein a rail is arranged on the working platform; the rail is provided with a headstock and a tailstock; the side wall of the working platform is provided with a plurality of through pin holes; the tailstock comprises a traveling mechanism, locking mechanisms and a fine adjustment mechanism, and is provided with a travel switch; the traveling mechanism comprises a driving motor, and an output end of the driving motor drives a pulley block through a middle transmission mechanism; the locking mechanisms are divided into two groups and are symmetrically arranged on two sides of the tailstock, each group of the locking mechanisms comprises a locking motor, an output end of the locking motor is connected with a transverse screw rod, a sliding block provided with a plug pin is inserted on the screw rod, and the position of the plug pin corresponds to the through pin holes; and the fine adjustment mechanism comprises a fine adjustment motor, an output end of the fine adjustment motor is connected with a rotating wheel, a longitudinally arranged screw rod is inserted on the rotating wheel, and the front end of the screw rod is connected with a tailstock clamp. The insulator horizontal tensile testing machine is also provided with a loading cylinder which is controlled by a remote measurement and control system. The insulator horizontal tensile testing machine adopts the movable tailstock, and has macro-movements, positioning and micro-adjustments so that the distance between the headstock and the tailstock on the working platform is convenient to adjust to adapt to tensile tests of insulators with different lengths.

The invention discloses a lifting mechanism of a free dropping type forced ramming machine with a hammer, comprising a hoisting device hoisted with a hydraulic cylinder and a fixed pulley block, wherein the fixed pulley block is matched with a movable pulley block which is fixedly arranged on a sliding device, the hydraulic cylinder is connected with a detaching device corresponding to the sliding device, and the detaching device is selectively connected with and separated from the sliding device. The lifting mechanism of the free dropping type forced ramming machine with the hammer replaces a detacher and a hoisting mechanism widely used in the construction of the present forced ramming machine, realizes the lifting and non-detached ramming operation, has the advantages of convenient use and appropriate cost, and has important significance on enhancing the safety and the efficiency of ramming construction.