97results about How to "Limit radial movement" patented technology

An assembly for guiding resection of a femur and tibia of a knee joint in preparation for installing a femoral and tibial knee components. For example, the assembly can include tibial and femoral IM rods to which are connected through a tensioning bolt that allows controlled adjustment of the distraction of the tibia and femur during cut positioning in a range of flexion angles. Also, the assembly is usable with relatively small, noninvasive approaches to the knee joint by way of relatively narrow, low profile components that attach to tibial and femoral IM rods. Further, the assembly includes several quick-release components to allow fast assembly and disassembly in a surgical setting. Each of these aspects, along with the ability of the assembly to accurately guide initial reference cuts to the tibia and femur, promotes an improved outcome for the patient.

A quasi-zero stiffness vibration isolator with annular permanent magnets used for generating negative stiffness comprises a base and an outer cylinder connected with the base, the outer permanent magnet is arranged in a top notch of the outer cylinder, an upper cover is connected with the outer cylinder, a sliding bearing is combined with a central hole of the upper cover in a sleeved mode, and a central shaft is sleeved with the sliding bearing and is in clearance fit with the sliding bearing. A sleeve and an adjusting sleeve are sequentially connected to the position, located on the lower portion of the sliding bearing, of the central shaft, and the inner permanent magnet is installed in the sleeve. A spring is arranged at the bottom of the central shaft in a sleeving mode, the bottom end of the spring is fixed to the base, and the top end of the spring is fixed to the adjusting sleeve. A mark line on the central shaft is used for representing the position of the inner permanent magnet relative to the outer permanent magnet. When the mark line coincides with the upper end face of the sliding bearing, the inner permanent magnet exactly faces the outer permanent magnet, and the isolator is in a normal working state. The quasi-zero stiffness vibration isolator has the advantages of being high in static stiffness and low in dynamic stiffness, basic stimulation with large amplitude can be isolated, and the mass of a vibration-isolated objected can be adjusted.

Embodiments of the present invention include a specimen enclosure apparatus. The specimen enclosure apparatus includes a container having a cavity configured to receive the specimen and an opening extending through a neck of the container to the cavity. An internal flange is positioned intermediate the neck of the container. The specimen enclosure apparatus further includes a closure device configured to be received in the opening. The closure device has a flange seal portion configured to contact the internal flange to form a flange seal proximate the cavity and further has a radial travel limiter integrally formed with the closure device that is configured to contact the container in the opening to limit radial movement of the flange seal portion relative to the internal flange. Containers and closure devices are also provided.

A flexible composite tube for medical applications is described. The tube has the ability to transmit a torque and to resist compression, tension, and kinking. The tube is also very flexible in bending, and has a small wall thickness. Different layers are used to obtain the desired properties. Torsional stiffness is obtained by embedding a braid in an elastomeric material. Resistance to kinks and to compression and tension is obtained by placing coils radially inward or outward of the braid. Smooth plastic layers are used to seal the assembly, and facilitate sliding in a body cavity.

A downhole tool for incorporation in a drill pipe for selective operation of the tool from surface level when the tool is in a wellbore. The tool comprises a controller electrically powered by a power source separate from surface level, a first sensor of the controller to detect a dynamic variable of the tool in the wellbore and produce an output signal dependent thereon; a second sensor of the controller to detect a mechanical signal transmitted from an operator at surface level; a motor driven by the power source under the control of the controller when said mechanical signal is received; and an actuator driven by the motor to actuate the tool; wherein the controller switches between at least two states in response to changes in said dynamic variable, only in said second state the controller being receptive to said mechanical signal from the operator to drive the motor.

The invention provides a six-degree-of-freedom quasi-zero-rigidity vibration isolation system based on a Stewart platform. The system comprises an upper platform, a lower platform and six same landing legs fixed between the upper platform and the lower platform through hinge blocks. The three hinge blocks are distributed in an equilateral triangle mode, two corresponding landing legs are fixed to each hinge block, the adjacent landing legs are perpendicular, and the upper platform has six degrees of freedom relative to the lower platform. The six landing legs have the quasi-zero-rigidity characteristic, so that the vibration isolation system has the quasi-zero-rigidity characteristic on the six degrees of freedom, the all-order resonant frequency of the vibration isolation system is small, and the wide vibration isolation frequency range is achieved. The system has the advantages of being high in bearing capacity and low in resonant frequency, has the good restraint effect on low-frequency vibration, and is suitable for vibration isolation of flywheel systems and optical cameras in the spaceflight field and vibration isolation of equipment such as precision machine tools and precision measuring systems in the civil field.

A turbine, e.g., a high pressure (HP) turbine, has a conventional drum-type structure with reaction turbine stages. A preceding or following turbine, e.g. an intermediate pressure (IP) turbine, on a common axis and on the same steam path, has rotor drum which carries an annular row of moving blades having root portions held within a slot in the periphery of the drum. A turbine casing surrounds the drum and carries a static blade assembly with an annular row of static blades which, together with the annular row of moving blades, constitutes a modified turbine stage. The static blade assembly has a radially inner static ring with a radially inner side confronting the periphery of the drum. A seal acts between the inner static ring and the rotor. The static blade assembly has an outer static ring which has a substantially greater thermal inertia and stiffness then the inner static ring and which is capable of sufficient sliding relative to the casing in a radial sense to accommodate relative thermal expansion and contraction of the outer static ring and the turbine casing.

A back reamer includes a drive stem configured to support a main reamer body, the main reamer body including a plurality of receptacles, and a plurality of cutting leg assemblies in positive locking engagement with the plurality of receptacles to restrict radial movement of the cutting leg assemblies.

A turbine (10) comprising a turbine rotor (11) having a blade support frame (13), and a plurality of blades (12) each pivotally mounted adjacent to its leading edge to the frame (13) for rotation about an axis extending substantially parallel to the axis of rotation of the rotor (11) with the trailing edge of each blade (12) being capable of pivoting downstream or downwind due to fluid dynamic forces on each blade. Pitch control means in the form of a ring or guide (23) is located around the shaft (15) and is coupled via links or lines (20) to the trailing end of each blade (12) to control the pitch of each blade (12) during rotation of the turbine rotor (11).

A vane assembly for a gas turbine engine comprising a number of radial loading elements disposed between lugs of the vane ring and the vane support, such as to generate a radial load force against the vane ring. The radial load force prevents unwanted relative movement between the vane ring and the vane support during operation of the gas turbine engine.

A polishing module including a chuck having a substrate receiving surface and a perimeter, and one or more polishing pads positioned about the perimeter of the chuck, wherein each of the one or more polishing pads are movable in a sweep pattern adjacent the substrate receiving surface of the chuck and are limited in radial movement to about less than one-half of the radius of the chuck measured from the perimeter of the chuck.

A plunger for use in tubulars in wells which produce fluids and / or gases under variable pressure. The plunger has at least two separate jackets comprised of segments mounted about one body or bodies joined by a connector, which collectively have increased sealing, holding, and lifting capabilities. A inner turbulent or labyrinth-type seal is accomplished by circumferential grooves on the core and / or fingers which project inwardly from the underside of the segments. The plunger body may also have an internal passage to facilitate more rapid descent, and a simplified stopper housed inside a chamber which is actuated when the plunger reaches a well stop or well bottom and which is held in a closed position by the build up of pressure below the plunger. When the pressure inside the tubulars above the plunger is reduced, the plunger and fluids move upwardly to the surface.

An assembly for guiding resection of a femur and tibia of a knee joint in preparation for installing a femoral and tibial knee components. For example, the assembly can include tibial and femoral IM rods to which are connected through a tensioning bolt that allows controlled adjustment of the distraction of the tibia and femur during cut positioning in a range of flexion angles. Also, the assembly is usable with relatively small, noninvasive approaches to the knee joint by way of relatively narrow, low profile components that attach to tibial and femoral IM rods. Further, the assembly includes several quick-release components to allow fast assembly and disassembly in a surgical setting. Each of these aspects, along with the ability of the assembly to accurately guide initial reference cuts to the tibia and femur, promotes an improved outcome for the patient.

A vane assembly for a gas turbine engine comprising a number of radial loading elements disposed between lugs of the vane ring and the vane support, such as to generate a radial load force against the vane ring. The radial load force prevents unwanted relative movement between the vane ring and the vane support during operation of the gas turbine engine.

A vibration dampening system for an air gun charging system includes a rear guide tube and a forward guide tube that are received within opposite ends of an air gun power spring, and a sleeve that fits concentrically over the power spring. The rear guide tube and the sleeve cooperate to reduce the free length of the power spring allowed to vibrate, which reduces vibration and improves firing performance.

The invention provides a suspension rotor blood pump and a pumping system, and relates to the field of artificial heart. The suspension rotor blood pump comprises a pump shell, a suspension rotor and an internal bracing-type journal; the suspension rotor and the internal bracing-type journal are located inside the pump shell; an inlet is formed in one end of the pump shell, and the internal bracing-type journal is located at the other end of the pump shell; the suspension rotor comprises substrates, blades and permanent magnet rotors; the substrates are arranged outside the internal bracing-type journal in a sleeving mode, and gaps are left, the blades are fixed to the sides, close the inlet, of the substrates, and the permanent magnet rotors are embedded in the substrates; the portion, close to the blades, of the pump shell is further provided with a water pumping chamber which is used for collecting blood and is communicated with the outside; a circle of stators corresponding to the permanent magnet rotors are fixed to the peripheral side of the pump shell. The suspension rotor blood pump is applied to the pumping system. According to the suspension rotor blood pump and the pumping system, the technical problem that blood contamination occurs when an existing blood pump is prone to axial leakage is solved.

The invention discloses a steel stranded wire bender, which comprises a bracket. A locating cylinder is arranged on the bracket, the bracket is further fixedly provided with a locating block, the locating block and a circumferential face of the locating cylinder are spaced, the bracket is hinged with a press arm, a swinging track surface of the press arm is vertical to an axial line of the locating cylinder, the middle part of the press arm is provided with a press wheel, a rotary shaft of the press wheel is parallel with the axial line of the locating cylinder, the locating cylinder is arranged at the inner side of a swinging track of the press wheel, and the minimum interval between the circumferential face of the locating cylinder and the swinging track of the press wheel is not less than the diameter of a steel stranded wire. The circumferential face of the locating cylinder is provided with at least two convex rings arranged at an interval. The circumferential face of the press wheel is also fixedly provided with auxiliary convex rings corresponding to the convex rings. The steel stranded wire bender of the structure has the advantages of reasonable structure, convenience for bending, time and labor saving, contribution to the improvement of working efficiency and convenience for carrying, and is particularly suitable for bending the steel stranded wire by one person.

The invention discloses a baffle rod type heat exchanger with a built-in expansion joint. The baffle rod type heat exchanger with the built-in expansion joint comprises a tube box assembly, a shell assembly, a tube bundle assembly and an expansion joint assembly, wherein the tube box assembly comprises a tube box cylinder, a tube box end socket, a tube box flange, a gas inlet and a gas distributor; the tube bundle assembly comprises a tube bundle, a left tube plate and a right tube plate are arranged at the two ends of the tube bundle, and the tube bundle assembly further comprises a short joint and a conical end socket; the expansion joint assembly comprises the expansion joint and a flange ring; the shell assembly comprises a shell pass cylinder, a shell pass end socket and a reinforcing tube; the tube bundle assembly is positioned in the shell pass cylinder, and the reinforcing tube extends to the outer part of the shell pass end socket from the inner part of the shell pass end socket; a cylinder flange is mounted at the end, close to the tube box, of the shell pass cylinder, and the left tube plate is clamped by the cylinder flange and the tube box flange of the tube box assembly; the right tube plate adopts a floating structure and is connected with the big end of the conical end socket through the short joint; and the small end of the conical end socket is connected with the expansion joint, the flange ring is positioned at the end part of the expansion joint, and the flange ring is hermetically connected with the end part of the reinforcing tube of the shell assembly.

The pressure jet propulsion disclosed herein generally includes an air compressor for generating a mass flow of compressed air and a mast mount assembly in fluid communication with the air compressor for receiving and channeling the mass flow of compressed air. A positioning system supports the mast mount assembly and is movable on-demand to relocate the mast mount assembly relative to a center of gravity in response to environmental changes. Furthermore, at least two blades are in fluid communication with the mass flow of compressed air from the movable mast mount assembly, which is discharged through an outlet at an angle relative to an axis of rotation to cause rotation of the blades.

A downhole tool for incorporation in a drill pipe for selective operation of the tool from surface level when the tool is in a wellbore. The tool comprises a controller electrically powered by a power source separate from surface level, a first sensor of the controller to detect a dynamic variable of the tool in the wellbore and produce an output signal dependent thereon; a second sensor of the controller to detect a mechanical signal transmitted from an operator at surface level; a motor driven by the power source under the control of the controller when said mechanical signal is received; and an actuator driven by the motor to actuate the tool; wherein the controller switches between at least two states in response to changes in said dynamic variable, only in said second state the controller being receptive to said mechanical signal from the operator to drive the motor.

Improvements in a semiconductor wafer container for reducing movement of semiconductor wafers within a wafer carrier using flexible wall segments, panels or flexible inserts in the base member's main inner containment diameter. These walls allow a vertical containment surface to move and capture the entire stack of wafers rather than a few wafers. The surface that contacts the wafers moves uniformly inward. The wafer stack is secured by reducing or eliminating the gap between the wafer container and the wafer stack. Further improvements include the addition of a ramped engagement surfaces in the top and / or bottom cover that provides mechanical advantage for easier assembly of the top and bottom cover. This design also allows for automated loading and unloading of the wafer stack because once the top cover is removed, the flexible walls spring back outward. Thus providing a small gap in which to freely remove the wafers.

One turbine, e.g. a high pressure (HP) turbine, has a conventional diaphragm and disc structure with impulse turbine stages. A preceding or following turbine, e.g. an intermediate (IP) turbine, on a common axis and on the same steam path, has a rotor drum which carries an annular row of moving blades having root portions held within a slot in the periphery of the drum. A turbine casing surrounds the drum and carries a static blade assembly with an annular row of static blades which, together with the annular row of moving blades, constitutes a modified turbine stage. The static blade assembly has a radially inner static ring with a radially inner side confronting the periphery of the drum. A seal acts between the inner static ring and the rotor. The static blade assembly has an outer static ring which has a substantially greater thermal inertia and stiffness then the inner static ring and which is capable of sufficient sliding relative to the casing in a radial sense to accommodate relative thermal expansion and contraction of the outer static ring and the turbine casing.

A variable-geometry turbine engine compressor, in particular a low-pressure turboreactor compressor, which is also called a booster, includes: an annular row of variable stator vanes, each of the vanes including a control gearing, and an synchronizing ring with an additional gearing which cooperates with the control gearing of the vanes, so as to control the effect with respect to the flow of the turbine engine. Each gearing of the vane or of the ring is a herringbone gearing, the teeth of a herringbone of which form between them an angle β of between 60° and 150° inclusive, or possibly equal to 120°.

A turbine, e.g., a high pressure (HP) turbine, has a conventional drum-type structure with reaction turbine stages. A preceding or following turbine, e.g. an intermediate pressure (IP) turbine, on a common axis and on the same steam path, has rotor drum which carries an annular row of moving blades having root portions held within a slot in the periphery of the drum. A turbine casing surrounds the drum and carries a static blade assembly with an annular row of static blades which, together with the annular row of moving blades, constitutes a modified turbine stage. The static blade assembly has a radially inner static ring with a radially inner side confronting the periphery of the drum. A seal acts between the inner static ring and the rotor. The static blade assembly has an outer static ring which has a substantially greater thermal inertia and stiffness then the inner static ring and which is capable of sufficient sliding relative to the casing in a radial sense to accommodate relative thermal expansion and contraction of the outer static ring and the turbine casing.

A configuration of a gear wheel (4, 5) on a main shaft (1) of a transmission, having at least two lay shafts (2, 3). The wheel (4, 5) is designed as a sum wheel or gear wheel, meshes with both of the lay shafts (2, 3), and is movable in the radial direction between lay shafts (2, 3). An elastic element (8, 13) is positioned, between the gear wheel (4, 5) and the main shaft (1), and / or between the gear wheel and the lay shaft to reduce radially movement of the gear wheel (4, 5).

A quasi-zero stiffness vibration isolator with annular permanent magnets used for generating negative stiffness comprises a base and an outer cylinder connected with the base, the outer permanent magnet is arranged in a top notch of the outer cylinder, an upper cover is connected with the outer cylinder, a sliding bearing is combined with a central hole of the upper cover in a sleeved mode, and a central shaft is sleeved with the sliding bearing and is in clearance fit with the sliding bearing. A sleeve and an adjusting sleeve are sequentially connected to the position, located on the lower portion of the sliding bearing, of the central shaft, and the inner permanent magnet is installed in the sleeve. A spring is arranged at the bottom of the central shaft in a sleeving mode, the bottom end of the spring is fixed to the base, and the top end of the spring is fixed to the adjusting sleeve. A mark line on the central shaft is used for representing the position of the inner permanent magnet relative to the outer permanent magnet. When the mark line coincides with the upper end face of the sliding bearing, the inner permanent magnet exactly faces the outer permanent magnet, and the isolator is in a normal working state. The quasi-zero stiffness vibration isolator has the advantages of being high in static stiffness and low in dynamic stiffness, basic stimulation with large amplitude can be isolated, and the mass of a vibration-isolated objected can be adjusted.