2451 results about "Jackscrew" patented technology

Apparatus and method for measuring spinal instability through the use of a distractor arm assembly having segments pivotal with respect to each other and movable through the movement of a pivotal collar assembly along a centrally positioned jackscrew.

An electrical connector including a jack and a plug is disclosed. The plug includes a spring biased push button slidably anchored in an opening on a top shell and including an indentation at either side, and a front trigger adjacent the indentation; two U-shaped positioning devices each comprising a front first protrusion at one end and an intermediate second protrusion; and a shield case comprising a grounding plate. The push button is pushed forward to engage with a front end of the opening in an inoperative state. The push button is adapted to push rearward to cause the trigger to push and press down the second protrusions until the first protrusions clear internal openings of the jack such that a subsequent pulling will disengage the plug with the jack.

Systems and methods are disclosed for manipulating an anatomical feature within the body of the patient. An implant such as an internal jackscrew is implanted at the anatomical and has first and second attachment points that secure to spaced-apart locations on the anatomical feature, an internal rotor coupled to the jackscrew, and is configured to drive motion of the jackscrew to manipulate the anatomical feature. The system further includes an external rotor that is magnetically coupled to the internal rotor such that rotation of the external rotor at an exterior location to the patient's body affects a corresponding internal rotation of the internal rotor to manipulate the anatomical feature.

The invention provides a liquid nitrogen pump power end assembly. The liquid nitrogen pump power end assembly comprises a crankshaft box assembly. The crankshaft box assembly is correspondingly connected with crosshead shell assemblies. Lubricating systems are correspondingly arranged between the crankshaft box assembly and the crosshead shell assemblies. The liquid nitrogen pump power end assembly adopts split type module combination of the crankshaft box assembly and the crosshead shell assemblies to be assembled, a crankshaft box is designed into a welding type, crosshead shells are designed into a casting type, compared with inblock casting or overall welding, the structure is simple and compact, existing machining manners are considered, machining, manufacturing, assembling, repairingand maintaining are facilitated, crossheads are provided with threads for connection and can be connected with fluid ends with different specifications on the market to play a role in transmitting power, a crankshaft adopts a split type structure that a straight shaft and multiple eccentric wheels are connected through flat keys, the crankshaft overall machining difficulty is lowered, crosshead hinge pins are provided with jackscrew holes, by means of jackscrew fixing, axial floating of hinge pins can be eliminated, the lubricating system can protect movement members, and the service life ofeach movement member is prolonged.

Systems and methods are disclosed for manipulating an anatomical feature within the body of the patient. An implant such as an internal jackscrew is implanted at the anatomical and has first and second attachment points that secure to spaced-apart locations on the anatomical feature. An internal motor is coupled to the jackscrew, and is configured to drive motion of the jackscrew to manipulate the anatomical feature. The system further includes an external driver that is inductively coupled to the internal motor to manipulate the anatomical feature.

A pallet jack with a pallet engaging fork having separate and independently movable first and second fork arms connected to independently controlled and operable first and second fork arm elevating means, for lifting a pallet loaded with a stack of items so that when the stack of items leans and is out of balance one fork arm can be elevated higher than the other to compensate and restore balance to the stack of items.

A powered auxiliary toilet seat lift provides a U-shaped casement formed by two similar elongate side members interconnected by a forward end plate to fit about a toilet stool and support a toilet seat structure thereabove for vertical and forwardly and downwardly angulated motion. Each casement side member is peripherally defined to create an internal chamber carrying similar elongately spaced lateral pairs of forward and rearward compound jackscrews that pivotally interconnect with the toilet seat structure thereabove. Powering mechanism provides separate electric motors powering each jackscrew that are controlled by a computerized feedback type circuitry for manually selectable or pre-programed motion of the toilet seat structure.

The invention relates to an indoor stretching-shearing testing device for an anchor rod, belonging to the technical field of geotechnical engineering. The device comprises a counterforce frame, a horizontal loading system, a lower shearing box, a vertical loading system, a horizontal guide rail system, an upper shearing box and a limit device. Due to the structure design of the horizontal guide rail system, the shearing movement of the upper shearing box along the horizontal loading direction is realized and a friction resistance in a shearing process can be effectively reduced. A first vertical loading jack and a second vertical loading jack in the vertical loading system are connected with the same hydraulic control system, thus a test anchor rod can always bear a vertically upward axial stretching force in the vertical loading process. By the indoor stretching-shearing testing device for an anchor rod, a shearing damage test of the anchor rod under different axial drawing forces can be realized and the defect that a conventional indoor stretching-shearing testing device for an anchor rod is only capable of performing a pure-stretching test is overcome; and the indoor stretching-shearing testing device for an anchor rod is of great importance in acquiring stretching-shearing damage test data of the anchor rod and understanding a damage mechanism of the anchor rod under a stretching and shearing comprehensive function.

A testing apparatus is disclosed that includes a turntable, an upper scissor jack assembly and a lower scissor jack assembly positioned in parallel planes, about a longitudinal axis and affixed to a base. The apparatus is powered by at least three motors with supporting controllers. The lower assembly is affixed to the base mechanically via the turntable which allows the lower assembly to rotate with respect to the upper assembly. There are two loading plates attached to the hinges of each scissor jack. The test specimen is secured by the loading plate. Each scissor jack operates by a screw-gear powered by one of the motors. Upon energizing a stepper motor; the screw-gear positions a scissor jack to apply a tension or compression on the specimen. While subjected to tension or compression, the lower jack assembly can be rotated with respect to the upper assembly for in-plane shear loading.

A bow press for use in stringing or repairing bows includes a base member, a vertical riser bar pivotally supporting a horizontal riser beam on which are adjustably mounted two handle rollers, left and right inclined spacer bars adjustably positionable along the base member, each spacer bar supporting a limb roller thereon and a jack mechanism for moving the riser bar up and down. An upper end portion of one spacer bar mounts a limb roller, a pivot connector mounts the upper end portion to the spacer bar for pivotal movement of the upper end portion toward and away from the other spacer bar and a hydraulically operated piston causes the upper end portion to pivot about the pivot connector toward the other spacer bar, whereby a bow limb supported by the limb roller is caused to bend toward the other bow limb to release the tension in the bowstring.

A converter allows a user to convert a conventional car jack from a non-specialized, general service variety into a specialty transmission jack. The car jack has a low, wheeled frame; a handle; a boom extending between a base end pivoted to the frame near the handle and an opposite end formed with a seat portion; and a hydraulic cylinder stretching between the frame and the boom which is actuated by pumping the jack handle to raise the boom. The seat portion of the boom is formed with a socket. The car jack conventionally is provided with a conventional cup having a stem which allows removable seating in the socket of the jack's boom. The converter head has a base plate defining a plane; a stem beneath the base plate for removable seating in the socket of the jack's boom; four or so arms extending between a butt end and a tip end; and cap screws threaded through the tip end of each arm. The cap screws allow adjustment in length and provide upper contact ends for propping a vehicle transmission thereon. The arms have slots in them and are bolted to the base plate by these slots such that the tip ends can be adjustably moved and locked into located in various positions substantially in the plane of the base plate. Wherein swapping back and forth between the cup and the converter head allows conversion of the jack into the specialty transmission jack.

The invention discloses a construction method for lifting an arch structure in a zero-deformation state. The construction method specifically comprises the following steps: 1, sectioning a large-span arch structure into floor arch structures and a lifting construction unit; 2, building up a support bed jig, splicing and assembling the lifting construction unit in situ and simultaneously installing the floor arch structures; 3, installing horizontal steel strands, horizontal jacks and tensioning the horizontal jacks to tension the horizontal steel strands; 4, building up lifting frames, installing lifting jacks and vertical lifting steel strands; 5, alternately tensioning the horizontal steel strands and the vertical lifting steel strands level by level so that the lifting construction unit is separated from the support bed jig; 6, lifting the lifting construction unit to a preset height to be in butt joint with the floor arch structures at two sides, thus forming the large-span arch structure; and 7, unloading and disassembling the horizontal jacks, the horizontal steel strands, the lifting jacks, the vertical lifting steel strands and the lifting frames level by level to finish the construction. The construction method has the advantages of high construction accuracy, high quality, reliable safety and low-cost construction measures.

The invention discloses a gear transmission jack which comprises a top tray, a threaded drum, a threaded mandril and gear transmission assemblies, wherein the lower part of the top tray is fixedly connected with the threaded drum; the lower end of the threaded drum is in threaded fitting with the upper end of the threaded mandril; at least two driving motors commonly drive the threaded mandril through the corresponding gear transmission assemblies to rotate, so that rotation of the threaded mandril can drive the threaded drum to rise and fall, to implement that the top tray jacks up and drops down a heavy object. By the arrangement of the two gear transmission assemblies, the jacking capacity of the jack is greatly improved, and the gear transmission efficiency is improved. Supporting of the gear assemblies of the gear transmission jack is also greatly improved, and the use convenience is enhanced; furthermore, due to motor driving, jacking automation is realized.

The invention discloses a jack hydraulic press, which belongs to the technical field of presses, and comprises a machine frame comprised of an upper beam, a lower beam, first and second trailing arms which are connected between the upper beam and the lower beam and longitudinally parallel to each other, a work rest arranged at the first trailing arm and the second trailing arm and corresponding to the space between the upper beam and the lower beam, a jack body arranged on the outer side of the first trailing arm or the second trailing arm, and an under-thrust device arranged at the upper beam and connected with a hydraulic circuit of the jack body. The jack hydraulic press is characterized in that: the upper beam is in a square structure which is closed on four sides and hollow along the up-and-down direction, the inner walls of a pair of wall bodies along the length direction of the upper beam are fixedly provided with a guide rail respectively, two guide rails are parallel to each other, and the under-thrust device is slipperily arranged on the guide rails. The jack hydraulic press has the advantages of saving operational labor, achieving high adaptability and reducing the labor intensity of the operator.

A jack assembly is provided for supporting a brake assembly, particularly an air disc brake caliper. The jack assembly includes a base having a telescoping cylinder that extends therefrom. A support member is secured on an opposite end of the cylinder and includes a securing arrangement for attaching the support member to an associated brake carrier. The support member is rotated about a vertical axis, translated along an horizontal plane provided by the wheels on the base, raised and lowered in height by the selectively extending cylinder, and/or pivoted along a connection with the cylinder. In this manner, the jack assembly is advantageously positioned adjacent the brake assembly, the caliper housing secured to the jack assembly, and then the jack assembly carries the caliper housing to a desired location for service.

A pallet jack includes a hydraulic system that allows for adjustment of the pallet-engaging portion of the jack using a mechanical adjusting system whereby a large variety of pallet sizes can be accommodated. Once the desired width is achieved, the hydraulic system is used to raise the pallet engaging portion of the pallet jack once the pallet is engaged.

An arrangement for supporting a building wall, such as a foundation wall, against inward movement caused by shifting of adjacent soil or by hydrostatic forces or other forces acting on the exterior surface of the wall to push it inwardly. The support arrangement includes upper and lower jacking members that each engage respective upper and lower sections of a support beam that is placed vertically against the surface of the wall to be supported. Each jacking member includes a respective jackscrew that is rotatable for applying a wall holding or a wall restoring force to either or both of the upper and lower sections of the wall.

A pool table carriage for supporting a pool table at an elevated position above a horizontal support structure, and for transporting the pool table between locations without damaging the pool table. The pool table carriage comprises two support plate assemblies and a main frame interposed therebetween. Each support plate assembly selectively supports one of the legs of the pool table, when the pool table carriage is being deployed. Each support plate assembly further has four selectively extendable rotatable jackscrews, and two wheel assemblies each having wheels. The jackscrews are extendable in two opposite directions. Rotation of the jackscrew in one direction causes the jackscrew to retract upward, thereby allowing the wheels to contact the support structure, thereby allowing the pool table carriage to roll between different locations. Rotation of the jackscrew in the other direction causes the jackscrew to extend downward, thereby raising the wheels above the support structure, thereby immobilizing the pool table carriage.

A method and apparatus for leveling a building foundation including excavating a cavity below the portion of the foundation to be raised at regular intervals and using and an oversized screw anchor driven under the foundation at approximately 15 degrees relative to the foundation edge at each of the excavated cavities, the anchor having relatively large helical screw flighting or auger plate to insure support at relatively shallow depths. Each excavated cavity is provided with a bed of dry cement mix. The method includes the steps of installing an anchor jack-plate upon said bed of dry cement the jack plate having a collar and gusset attached thereto slidable upon the screw anchor shaft, providing a pair of hydraulic jacks atop the anchor plate, taking a portion of the foundation load on each jack, thereby directing the load at each jack in axial alignment with the helical screw anchor flighting or auger plate, setting the cement by wetting and welding the collar of the anchor jack-plate to the screw anchor shaft only when the foundation is considered level, installing a screw jack at each lifting point and removing the hydraulic jacks and pumping cement into any voids detected below the foundation footing.

A snow bike system includes a motorcycle converted for use in the snow with a rear suspension and belt track system. The belt track is relatively very wide and driven by a front wheel sprocket through a jackshaft. Matching shocks and struts in the rear suspension independently equalize the pressure applied to the ground. The rear strut is a sliding extension type that causes the front of the sliders to kick up when fully compressed during acceleration or climbing uphill. Increased weight on the rear track is shifted forward to keep the front ski down. The jackshaft provides both disc braking and moves the motorcycle engine drive power outboard to accommodate the wider belt track. A tubular subframe and tunnel rigidly mounts to the motorcycle's original rear swing arm pivots and shock mounts.

A frame assembly is formed of side rails with a cross rail and spaced vertical support rails. A drive screw is positioned on the cross rail. A motor and a follower are received on the jack screw. The follower may move upwardly and downwardly on the drive screw. A chair has a seat portion and a back portion and is movable between a raised orientation and a lowered orientation on the floor. A separable securement area couples the seat portion with the follower. A control assembly includes an up button and a down button and a stop button.

A scissor lift device is provided having twin vertical screws that act to raise or lower a substantially horizontal and flat platform using a pair of scissor jacks. A single DC motor can be provided within the scissor lift device housing, and is operatively connected to one vertical screw. The other vertical screw is connected to the first by a locked linkage that passes from one screw to the other in the base of the scissor lift device. As such, rotation of the motor results in an equal movement in both vertical screws, and thus equal movement of both scissor jacks. The configuration is easily serviced and installed, and is adapted to have the stationary and moveable components each covered by a protective shells. Additionally, the platform of the device can be easily leveled using a locking pin to lock the platform in a level position once the base of the device has been installed.

Disclosed herein is a mechanical screw jack comprising: a housing; a mechanical jack stroke limiting nut connected to the housing, the nut having a nut wall, the wall defining an interior female threaded surface and an interior screw travel limiting surface located adjacent to the interior female threaded surface; and a mechanical jack screw having an externally threaded male surface for threadably engaging the interior female threaded surface of the mechanical jack stroke limiting nut and a disruption; wherein the unthreaded screw travel limiting surface is capable of interferingly engaging at least a portion of the disruption to prevent over travel of the threaded screw. A method of limiting screw travel in a mechanical screw jack is also disclosed. Advantageously, screw travel is limited such that a user can over torque the screw, such that the screw can travel with respect to the nut without damaging the threaded portion of the nut. The invention increases mechanical screw jack life and reduces the likelihood of separation of such mechanical jacks into their component parts during repeated and vigorous use. The invention further reduces, or substantially eliminates the likelihood of a user experiencing any residual torque effect which can cause a screw jack to lock up during repeated use.

A jack plate is configured to allow removal of hydraulic components from a fixed portion of the jack plate without having to remove an outboard motor from the jack plate. A mechanical stop device is provided which supports a movable member of the jack plate relative to a stationary member of the jack plate and, as a result, supports the outboard motor even as the hydraulic components are removed from the jack plate. This allows the hydraulic cylinder, hydraulic pump, and motor to be removed from the jack plate by loosening and then detaching a removable bracket member from the jack plate. As a result, the hydraulic system can be inspected, maintained, or replaced without having to remove the outboard motor from the jack plate.

The invention relates to a construction method for demounting a cable-stayed bridge fast. An anchor is hard to be removed under the condition that a stayed cable has cable tension, a special tool is used for transforming the stress of an upper anchor ring, a cable and a lower anchor head into zero, then an upper anchor head is cut by compulsion, the cable is chopped up, and the lower anchor head is removed for saving the anchor-removing time, so as to change cables fast. A punching tensioning jack is installed at an anchor pipe opening of the cable. A tension rod is arranged in the jack. The tension rod tensions after penetrating into a tool anchor ring. The tool anchor ring is screwed into the tail end of an anchor head to replace an old anchor ring, and the old anchor ring is taken out by cool cutting. The jack is moved to the tail of the tension rod by the repeated tension and release of the tool anchor ring to ensure that the cable still has 30 to 40 tons of tension. Two sets of cable clamps are used for clamping two ends of the cable to be chopped up. A windlass pulley set is connected between the cable clamps. The pulley set is frapped to transform the internal force of the cut section of the cable into zero and chops the cable. A hoisting apparatus is used for taking out the cut cable on a tower. A hollow drill rod is used for drilling concrete or epoxy mortar in a cable anchor pipe at the end of a beam. The punching tensioning jack is used for pulling out the anchor head by compulsion.

The invention discloses a test apparatus and a method for geotechnical engineering side slope multi-direction loading. The test apparatus comprises a steel frame, a rotation shaft support, a horizontal loading jack, a vertical loading jack and an inclined loading jack, wherein the steel frame is connected with the rotation shaft support, the bottom inside the steel frame is provided with a side slope bottom support plate, one side of the steel frame is provided with a side slope vertical retaining wall, one end of the horizontal loading jack is connected with a horizontal loading reaction wall, the other end is connected with the side slope vertical retaining wall, the horizontal loading reaction wall is connected with the rotation shaft support, the bottom of the side slope vertical retaining wall is matched with the upper surface of the side slope bottom support plate, the vertical loading jack is connected with a vertical loading reaction frame above the steel frame, one end of the side slope bottom support plate and the rotation shaft support form a hinged connection so as to relatively rotate, and the other end is connected with the inclined loading jack. According to the present invention, test requirements are met, test efficiency is increased, comprehensiveness is strong, and test operation is convenient.

An adjustable height table includes a base frame, a slider frame assembly, a generally planar support surface and a lifting mechanism. The main portion of the base frame is formed by welding three tubular components to form an H-shape. Each of the end portions of the H-shape include a mounting to support a swiveling locking castor. Above each castor there extends from the H-shaped main portion, a vertically extending tubular post. The slider frame assembly preferably includes an H-shaped main portion formed of three tubular members. Four vertically extending hollow tubular column members are attached to the H-frame so that they may telescopingly engage the four vertically extending posts of the base frame. A generally planar support surface is attached to the top of the four vertically extending columns located on the slider frame. Located between the central tube of the H portion of the base frame and central tube of the slider frame assembly, there is located a lifting mechanism, preferably a hydraulic jack or a pair of electric motors. This jack can be actuated by a pedal mechanism to lift the slider frame assembly relative to the base frame. A second pedal is provided in the lifting mechanism to have the slider frame lower at a controlled rate of descent. Additionally an anti-sway bar is provided to prevent the lifting pump pedal from swaying side to side when in use.

An extensible and turnover handle structure for a jack comprises a pivot ear formed at the front end of a base. The pivot ear is provided for a pivot connection with the handle. Moreover, the handle includes an inner pipe inserted in an outer pipe and serves to draw out the inner pipe in use, thus elongating an arm of force relative to the base, and the handle can be turned to a position above a top plate to reduce volume during storage.

A trailer tongue jack includes a grease (or zerk) fitting for providing grease to internal parts The jack includes an outer tube and an inner telescoping tube. A threaded insert (or nut) is fixedly attached inside an upper end of the inner telescoping tube. A screw shaft threadedly cooperates with the insert to extend or retract the inner telescoping tube from a lower end of the outer tube. A crank is provided to turn the screw shaft either directly or through gears, and a thrust bearing carries a vertical load between the screw shaft and the outer tube. The grease fitting allows the internal parts, and the thrust bearing in particular, to be easily lubricated.

The invention relates to a method for assembling a main shaft and a gear box of a large-scale wind-driven generator. The assembly steps are as follows: a. the gear box is horizontally arranged on a rack to cause the shaft hole of the main shaft of the gear box to be horizontal, and a hole which relatively penetrates the shaft hole of the main shaft is arranged on the gear box; b. the main shaft is horizontally lifted to target at the installation position of the gear box; c. an overhead travelling crane is adjusted to cause the main shaft to be coaxial with the shaft hole of the gear box; d. a pull rod penetrates the hole of the main shaft and the hole on the shaft center of the gear box, and a fixed block member is underlaid under one end of the pull rod extending out from the main shaft; e. the other end of the pull rod, which extends out from the gear box, is sheathed with a jack, and is provided with a fixing member; f. the jack is driven to extend, and on the premise that both ends of the pull rod are fixed, the extension of the jack can pull the main shaft into the gear box; g. after being pulled into the gear box, the main shaft is fixed on the gear box by a locking ring; h. the main shaft is well supported by the support, and hanging belts are removed; and i. the fixing member and the jack are dismounted, the pull rod is pulled out of the main shaft and the gear box, and finally, the entire assembly process is completed.