5167 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.

The invention relates to a three-dimensionally adjustable disconnectable curtain wall connecting device. In the three-dimensionally adjustable disconnectable curtain wall connecting device, the section of a back pendant has a chair shape; a back bolt hole is formed at the back of the chair and is in threaded connection with an embedded nut at the back of each curtain wall plate through a back bolt; the back chair legs have L shapes and are propped against the back of each curtain wall plate; a jackscrew bolt hole is formed on the chair surface and is connected with an adjustable supporting piece of which the upper end is embedded between the front and back chair legs through a jackscrew bolt; the adjustable supporting piece is formed by connecting a supporting plate, a vertical plate and an adjusting plate to be a whole; the supporting plate is in top contact connection with the jackscrew bolt; the thread height of the jackscrew bolt is more than the longitudinally adjusting distance of each curtain wall plate; and a long round hole vertical to the wall body is formed on the adjusting plate. The device solves the problems that the position of each curtain wall plate cannot be adjusted, the plate gaps are different in sizes, the curtain wall plates are staggered with one another and the like so as to guarantee the appearance of the curtain wall and overcomes the defect that the installation of the traditional curtain wall plates completely depends on the control level and the vertical deflection of keels at the same time, so that the construction quality can be controlled easily.

A jack storage assembly is provided for use in conjunction with an automotive vehicle having a wheel well for storage of a spare tire and in which the wheel well includes a bracket over which the spare tire is positioned. The assembly includes a bucket which is adapted to contain a jack, and the bucket is detachably secured to the bracket so that the spare tire is sandwiched in between the bucket and the wheel well. The cover is then positioned over the spare tire while a fastener is detachably secured to the bucket such that the cover is sandwiched in between the fastener and the bucket.

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.

The invention discloses a liftable hydraulic climbing mould and construction method, which comprises the following parts: mould system, hydraulic elevation system and operation platform system, wherein the mould system connects two moulds through extended bolt, whose back connects the steel back deck; the stripper is set on the mould at each space; the liftable jack of hydraulic elevation system crosses on the top of support rod, which connects the support ridge cross-shape; the elevation rack and operation system are connected under the support ridge; the pillar of elevation rack contains moving support leg and channel clamp; the moving support leg contains horizontal extension lead-screw in the clamp, which connects the mould back ridge; the bottom of elevation pillar connects the adjustment lead-screw vertically.

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.

The invention provides a control method of an intelligent tension system and the intelligent tension system. The method is characterized by including the steps that a loading speed control unit is built and used for detecting pressure of an oil inlet, and the pressure, monitored in real time, of the oil inlet is compared with preset pretightening force of each stage; a prestressing tendon extending amount control unit is built and used for detecting the displacement value of a prestressed steel bar in real time in the tensioning process and the displacement value of the prestressed steel bar in set holdup time after the prestressed steel bar reaches set tension force of each stage; tensioning values of different jacks are compared after first-stage tension; control signals of different stage conditions in the tensioning process are converted into electromagnetic motions and frequency converter rotation speed control requirements; according to signals fed back by a pressure sensor and a displacement sensor in the tensioning process, the related control commands undergo fuzzy conditioning. The control method and the system have the advantages of improving data measuring precision and construction efficiency, reducing labor intensity of construction workers, reducing cost, improving labor efficiency, eliminating safety hidden risks of the construction workers, and enabling the whole tensioning process to be finished at a time.

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.

A wheel dolly is disclosed that is suited to serve as both an automobile jack, capable of holding large loads aloft for extended periods, relying on only mechanical systems and eliminating hydraulic systems. In a further aspect, the wheel dolly of the present invention does not include extended arms, handles, or levers for pumping or rotating the lifting mechanisms. Each lifting element terminates in only a single nut exposed to the user. Preferably, each nut of each lifting system has the same plan dimensions as the other, thus providing the advantage of allowing the user to operate the dolly with a driver and only one socket.

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.