2526 results about "Linear displacement" patented technology

An electromagnetic linear generator and regenerative electromagnetic shock absorber is disclosed which converts variable frequency, repetitive intermittent linear displacement motion to useful electrical power. The innovative device provides for superposition of radial components of the magnetic flux density from a plurality of adjacent magnets to produce a maximum average radial magnetic flux density within a coil winding array. Due to the vector superposition of the magnetic fields and magnetic flux from a plurality of magnets, a nearly four-fold increase in magnetic flux density is achieved over conventional electromagnetic generator designs with a potential sixteen-fold increase in power generating capacity. As a regenerative shock absorber, the disclosed device is capable of converting parasitic displacement motion and vibrations encountered under normal urban driving conditions to a useful electrical energy for powering vehicles and accessories or charging batteries in electric and fossil fuel powered vehicles. The disclosed device is capable of high power generation capacity and energy conversion efficiency with minimal weight penalty for improved fuel efficiency.

A syringe driver or pump system based upon a syringe stem and associated assembly having a spiral threaded pattern along the outer surface of the stem, a collet-button which is displaceable along the stem assembly (as a nut is displaced along a bolt) and a spring. All are disposed to provide a cam action, translating rotary activity of the collet-button, which tends to be displaced to compress the spring when rotated, to linear displacement as the force of energy is released from the spring when compressed. Thus, force available for driving effluent fluid flow from the syringe is limited by the energy available from the spring, rather than force and energy which might be directly applied to otherwise displace the syringe stem assembly and collet-button. A digitally activated syringe driver and an electrical motor activated driver is disclosed. A number of electronic control systems for the motor are also disclosed.

An improved system (20) for the calibration of a robot system. The system (20) comprising a linear displacement measurement device (32) in conjunction with a robot calibration system. The linear displacement measurement device (32) comprising an elongated member (34), a drum, a shaft, a drum displacement mechanism and a drum rotation sensor. The drum is displaced axially upon the shaft as the drum rotates when the elongated member (34) is moved. The drum rotation sensor provides accurate information regarding the distance the elongated member (34) travels. The displacement measuring device (32) is used in an iterative manner with the calibration system (20) for the purpose of the calibration of a robotic device (22).

An apparatus (10) for applying at least one load to a specimen (12) according to one embodiment of the invention may comprise a mass (18). An actuator (20) mounted to the specimen (12) and operatively associated with the mass (18) moves the mass (18) along a linear displacement path (22) that is perpendicular to a longitudinal axis of the specimen (12). A control system (26) operatively associated with the actuator (20) operates the actuator (20) to reciprocate the mass (18) along the linear displacement path (22) at a reciprocating frequency, the reciprocating frequency being about equal to a resonance frequency of the specimen (12) in a test configuration.

A magnetic linear displacement sensor. In accordance with one embodiment, the displacement sensor includes a Hall transducer element having a sensor plate surface and at least one magnet having a lengthwise dimension along which said Hall element detects a magnetic field component orthogonal to the sensor plate surface during displacement sensing. The magnet includes first and second pole faces disposed on opposite lengthwise sides thereof and a polarization axis aligned orthogonally with respect to the lengthwise dimension. The first pole face opposes the Hall, element and is characterized as having a non-planar surface contoured to generate a substantially linear orthogonal magnetic field component sensed by said Hall element during linear displacement sensing.

Methods and apparatus for detecting an operation of a downhole tool using an optical sensing system are disclosed. In an embodiment, a flow control device has an inner tubular member moveable relative to an outer tubular member and a thermally responsive chamber capable of a change in temperature during a movement between the inner tubular member and the outer tubular member. Detecting the change in temperature in the thermally responsive chamber with an optical sensing system provides real time knowledge of the position of the flow control device. In another embodiment, a flow control device comprises an inner tubular member moveable relative to an outer tubular member that produces an acoustic signal during a movement between the inner tubular member and the outer tubular member. Detecting the acoustic signal with an optical sensor provides real time knowledge of the position of the flow control device.

A universal holding fixture assembly includes a plurality of linear actuators supported by the fixture and adapted to engage and support a workpiece relative to the fixture. A linear displacement member is supported by a housing and adapted to move between retracted and extended positions. An end effector assembly is operatively supported by the linear actuator and adapted to engage the workpiece when the linear displacement member is in its extended position. A sensor is operatively supported by the end effector assembly and is responsive to contact with the workpiece to establish a datum of the position of the linear actuator relative to the workpiece.

The invention discloses a double-frequency grating interferometer displacement measurement system. The system comprises a double-frequency laser device, an interferometer, a measuring grating and an electrical signal processing portion. The measurement system achieves displacement measurement based on optical grating diffraction, the optical doppler principle and an optical beat frequency principle. The double-frequency laser device transmits double-frequency laser, the laser is divided into reference light and measuring light through a polarizing beam splitter, the measuring light transmits into a position of the measuring grating, positive and negative first-order diffraction occurs, diffraction light and the reference light form a beat frequency signal which contains displacement information in two directions at the position of a light detection unit, and linear displacement output is achieved through signal processing. According to the system, the sub-nanometer-grade or even higher grade of resolution ratio and accuracy can be achieved, and horizontal large-stroke displacement and horizontal displacement can be measured at the same time. The system has the advantages of being insensitive to the environment, high in measuring accuracy, small in volume and light in weight. The system serves as a lithography machine ultraprecise workpiece platform position measurement system, the comprehensive performance of the workpiece platform can be improved.

A muscle toning exercise device adaptable from a stationary configuration wherein the device is capable of 360° rotation about a vertical axis, to a movable configuration wherein the device is capable of movement in all directions on a planar surface in addition to 360° rotation. The exercise device includes a handle that extends out from a base that supports the weight of a user. The base of the exercise device contains a series of rolling members that protrude out from the bottom to allow the device to move along the surface upon which the exercise is being performed so that the entire exercise device can be rotated a full 360° about an axis that extends through the center of the device, while further allowing for the displacement of the base, and subsequently the entire exercise device in any direction along a planar surface. A separate cup-shaped base member that rests on the planar surface and in which the exercise device may be selectively installed in covering relation with the rolling members. The cup-shaped member includes a vertically projecting generally cylindrical side wall extending around the base of the exercise device thereby limiting the linear displacement of the device along the planar surface and allowing only for the rotation of the device about a central axis.

An actuator including actuator base, bobbin, and pole piece forming a pocket for a ferromagnetid armature located therein. The actuator including a radial magnet and a solenoid coil constructed and arranged to cause a linear displacement of the armature upon application of a coil drive current from a control circuit. The actuator may include a flexible membrane that partially encloses the armature to form an armature chamber filled with an incompressible fluid. In a valve design, a fluid flow is stopped by driving the membrane against a valve seat. Pressure from the controlled fluid in the conduit is transmitted through the membrane to the fluid within the armature chamber so that the armature does not need to counteract force applied to the membrane by the conduit fluid's pressure. A fluid flow is opened by driving the membrane away from the valve seat.

Electromagnetic actuators capable of generating a symmetrical bidirectional force are disclosed. The electromagnetic actuators include a housing made of a ferromagnetic material and a shaft made of a magnetically inert material movable along an axis within the housing. In one type of actuator, captive permanent magnets are arranged on opposite interior end walls of the housing and an electromagnetic coil is mounted on a central portion of the shaft. The electromagnetic coil is capable of generating a force when energized that causes linear displacement of the shaft in either direction along its axis depending on the direction of current through the electromagnetic coil. In another type of actuator, captive electromagnetic coils are arranged on opposing inner end walls of the housing, and a permanent magnet is mounted on a central portion of the shaft. The electromagnetic coils are capable of generating a force when energized that causes linear displacement of the shaft in either direction along its axis depending on a direction of current through the electromagnetic coils.

A handheld wet slurry thickness gauge and method for its use. The thickness gauge includes a distance displacement measurement gauge, a skirt, a platen and support legs. The distance displacement measurement gauge includes a case, a vertical stem, and a vertical spindle. The stem extends from the case. The spindle is slidably supported to move in an axial direction within the stem. The case body has a display for indicating a linear displacement of the spindle. The skirt has a central through-hole for receiving the stem of the gauge and retaining the stem in an upright position. The measuring platen has a platen base and a platen shaft extending upwardly from the platen base and attached to the spindle. The support legs extend downwardly from the skirt. The platen is below the skirt.

The invention discloses a component combined torsion experimental device comprising two counter-force frames which are fixed on a foundation terrace, a counter-force beam with two ends which are fixed at the upper ends of the counter-force frames and a counter-force wall fixed at the left side of the counter-force beam, wherein a component is fixed on the foundation terrace. The component combined torsion experimental device is characterized by further comprising a vertical force loading system for applying a vertical force to the component, a horizontal force loading system for applying a horizontal force to the component, a component top linear displacement guide system for meeting requirements of axial deformation, bending deformation and shearing deformation of the component, and a foundation displacement limiting system for fixing the position of the component. According to the experimental device and the method disclosed by the invention, the disadvantages of the existing similar experimental devices and methods are overcome; an experimental principle is scientific and an experimental process is simple to operate and control; the experimental device is convenient to assemble and can be used while being installed; and the experimental device can be circularly used and an experimental result meets a combined torsion performance of the structural component under the horizontal earthquake action, so as to provide experimental guarantees for disclosing a combined torsion mechanism and an anti-seismic property of the structural component.

The invention provides a three-dimensional detection device and method for scanning the appearance of a welding seam in high-frequency resistance welding based on linear structured light. The three-dimensional detection device comprises a linear structured light sensor, a linear displacement transmission system and a computer, wherein the linear structured light sensor comprises a laser, an industrial camera and a fixed panel; and the linear displacement transmission system comprises a base, a stepping motor and a stepping motor controller. A welded object is placed on the base of the transmission system, scanning is performed by adopting the linear structured light, the industrial camera shoots a laser stripe image of the welding seam, the laser stripe image is processed through a software system to obtain three-dimensional point cloud data of the welding seam, appearance characteristics such as the width and the height of the welding seam are acquired through analysis, and thus judgment can be performed on the quality of the welding seam. The three-dimensional detection device has the advantages of high precision, safety, reliability, real-time detection and the like, improves the efficiency of welding seam quality detection and can achieve automatic detection for the welding seam quality.

The invention discloses a three-degree-of-freedom reflector adjusting device, which can achieve inclination and pitch adjustment of a reflector by using the multi-degree-of-freedom work principle of gimbal and achieve linear displacement adjustment of another degree of freedom by controlling the distance between an adjusting pedestal and a reflector frame. The adjusting device comprises the reflector frame and the adjusting pedestal, wherein the a reflector is arranged on one side of the reflector frame; the other side of the reflector frame is opposite to the adjusting pedestal; a linear displacement adjuster connected with the reflector frame and the adjusting pedestal, the linear displacement adjuster is universally connected with the side of the reflector frame opposite to the adjusting pedestal at one end and is axially connected with the adjusting pedestal at the other end; and the connection position of the linear displacement adjuster and the reflector frame corresponds to the geometric center of the reflector.

A fast-releasing device of an activator includes a clutching means, a turning means and a pulling means. The clutching means covers on a screw rod of the activator and is accommodated within a base, and includes a fixing base and a clutch. The turning means is accommodated within the casing of the activator and includes a swinging arm pivoted to the base. One end of the swinging arm is arranged to correspond to the clutch so as to control the clutching action between the fixing base and the clutch. The pulling means includes a pulling rod assembly. One end of the pulling rod assembly is accommodated within the casing and connected to the swinging arm, and the other end thereof penetrates out of the casing and is joined with a connecting block. With the above arrangement, a curved swinging movement can be transferred into a linear displacement, thereby to substantially reduce the applied tension force of an operator.

The invention discloses a crane device with a three-degree-of-freedom active heave compensation function and a compensation method in the ship field. A circular movable platform is arranged over a circular fixed platform. Three servo cylinders which are distributed uniformly in the circumferential direction are connected between the circular fixed platform and the circular movable platform. Each servo cylinder is provided with a linear displacement sensor. A stand column fixedly connected with the circular movable platform is arranged on the lowermost portion of the crane device. The upper end of the stand column is connected with the rotating end of a crane jib through a hinge pin. A hydraulic motor is fixedly arranged at the rotating end of the crane jib. An angular displacement sensor is arranged on the hydraulic motor. Movement posture values are measured through a posture sensor. The movement values of the three servo cylinders and the hydraulic motor are worked out through a movement controller according to the movement posture values. The inverse values of the movement values are compensation values. Real-time compensation for rolling and pitching of a ship is achieved through the three servo cylinders, real-time compensation for heaving is achieved through the hydraulic motor, and therefore lifting tasks can be executed safely and efficiently under severe sea conditions.

This invention relates to a tap assembly for a liquid vessel, having an overfill protection device and a float controlled mechanical or magnetic level gauge. A single float actuates a stem of the overfill protection device as well as a rod of the level gauge. The rod of the level gauge has one end movable linearly in a valve body bore and carrying a permanent magnet for actuating a magnetic level indicator. In one embodiment a crank mechanism may be provided between a float lever and the rod of the level gauge to cause the rod to effectuate a swinging movement and simultaneously displace the rod longitudinally to cause linear displacement of the permanent magnet in the valve body bore. In another embodiment the rod may be actuated by a cam to cause axial displacement thereof without swinging motion.

The invention discloses an ultrasonic linear motor which comprises an outer tube stator, a middle tube rotor, an inner tube, a guide mechanism and a piezoelectric piece, wherein the piezoelectric piece is fixed on the outer side surface of the stator, the stator drives the middle tube rotor to rotate, the inner tube is connected with the stator through the guide mechanism, and the middle tube rotor drives the inner tube to make linear motion. The invention also discloses an automatic focusing / zooming system driven by the ultrasonic linear motor, an optical lens is inserted inside the inner tube, and a light sensing chip is fixed on a plane at the bottom part of the stator. The invention has the advantages that two-stage drive motor structure is provided, the helical motion generated by the rotor in the first-stage drive is restored to be the only linear motion of the inner tube through the second-stage drive, only the linear displacement without rotation is generated during the working process of the automatic focusing / zooming lens module, so as to meet the requirements of high pixel, and high-precision automatic focusing or zooming, and the invention still has simple and compact structure, is suitable for the miniaturization, and has high precision of the linear displacement.

An ablation catheter includes a flexible elongated shaft having a flexible electrode at its distal end. The flexible electrode includes an inner, flexible, electrically-conductive element and an outer, flexible, electrically-conductive polymer layer in electrical contact with the inner, flexible, electrically-conductive element. The catheter further includes an electrically insulative sheath surrounding at least a portion of the flexible electrode and a linear displacement mechanism capable of adjusting at least one of the electrically insulative sheath and the flexible electrode to vary a length of the flexible electrode exposed at the distal end of the shaft. Also disclosed is an adjustable length ablation electrode and methods of ablating tissue.

Instrumentation for treatment of the spine, including an elongate member having a deformable distal end portion at least partially formed of a flexible and preferably elastic material. The distal end portion has an initial configuration for placement adjacent a vertebral body and a deformed configuration defining at least one outwardly extending projection for displacement of at least a portion of the vertebral body. The elongate member preferably comprises a rod member, a sleeve member and an actuator mechanism for imparting relative linear displacement between the rod and sleeve members to effect outward deformation of the distal end portion of the sleeve member. In one embodiment, the instrumentation is used to compact cancellous bone to form a cavity within a vertebral body. In another embodiment, the instrumentation is used to reduce a compression fracture. In yet another embodiment, the instrumentation is used to distract a disc space between adjacent vertebral bodies.

A position sensing device comprises a light source that radiates diffuse source light along an optical axis direction to a detector, and a moving aperture arrangement positioned between the source and detector, to move perpendicular to the optical axis direction. The moving aperture arrangement comprises first and second limiting apertures, which angularly filter and transmit the diffuse source light to form a measurement spot on the detector. At least one signal output by the detector is indicative of a position of the movable member along a measurement axis. The angular intensity distribution of the angularly filtered rays of light which form the measurement spot is more consistent as a function of position along the measurement axis than the angular intensity distribution of the source light. The resulting consistent intensity distribution within the measurement spot throughout the measurement range enhances measurement linearity and accuracy.

A time grating linear displacement sensor based on an alternating electric field comprises two parts, namely a head measuring base body and a sizing base body, wherein a left electrode and a right electrode are coated on the lower surface of the head measuring base body; a left row of electrodes and a right row of electrodes are coated on the upper surface of the sizing base body; the distance between the start position of the left row of electrodes and the start position of the right row of electrodes of the sizing base body is 1 / 2 electrode width; the lower surface of the head measuring base body is relatively parallel to the upper surface of the sizing base body; a fixed clearance theta is formed between the lower surface of the head measuring base body and the upper surface of the sizing base body; a left group of differential capacitors and a right group of differential capacitors are formed; the head measuring base body and the sizing base body are relatively moved; the left rowof electrodes and the right row of electrodes of the sizing base body are respectively connected with sinusoidal excitation voltages with equal amplitude and equal frequency, wherein the difference between the phases of the sinusoidal excitation voltages is 90 degrees; two routes of electric field coupling signals respectively generated by the left electrode and the right electrode of the head measuring base body are combined into one route of travelling wave signals Uo through an adding circuit; after the route of travelling wave signals Uo is shaped with one route of common-frequency reference signals Ur with fixed phase, phase comparison is performed; and the phase difference between the two routes of signals is represented by an interpolated clock pulse and is transformed to generate a linear displacement value. The time grating linear displacement sensor based on the alternating electric field has the advantages of low power consumption, light weight, high resolution and low cost.

The invention provides an automatic measurement device for treewalk growth, which realizes that the real-time growth and growing status of treewalk are monitored in real time by virtue of a wireless network node remote monitoring device. The device comprises a device fixing module and a measurement module, wherein the device fixing module fixes the measurement module on a position of a trunk requiring measuring treewalk variation; the measurement module comprises a linear displacement sensor with a spring, a measuring head pulley, a steering pulley, a guide pulley, a non-elastic fine steel wire, a clamp and a connecting part of the measuring head pulley and the linear displacement sensor with the spring; the non-elastic fine steel wire passes through the steering pulley, the guide pulley and the measuring head pulley, and encloses the position requiring measuring the treewalk; two ends of the non-elastic fine steel wire are clamped by virtue of the clamp; and the treewalk growing variation is determined according to the displacement of the linear displacement sensor with the spring.

The invention relates to an extraction module with linear closure for the pressurized preparation of a drink from a capsule, containing a substance for extraction, comprising a device for extraction with a first extraction sub-assembly and a second mobile extraction sub-assembly closing against the first sub-assembly such as to form an extraction chamber in the closed position and to provide sufficient space between the two sub-assemblies for introduction of a capsule between the sub-assemblies in the open position and comprising a device for fixing and positioning the capsule between the two sub-assemblies. The device for fixing and positioning may be displaced in a coaxial manner with relation to the linear displacement of the mobile extraction sub-assembly and is capable of being displaced linearly by the second mobile sub-assembly in to a displaced position such as to permit a closing of the two sub-assemblies around the capsule.

The invention relates to space coordinate measurement of large engineering and large machines and workpieces, and provides a large three-dimensional coordinate measuring system, which can be used on an engineering or production site, has high measurement accuracy, safe and reliable working and large measurement range, can detect the internal and external characteristics of a detected object and can meet the requirement for large size measurement in various engineering and production. The technical scheme adopted by the invention is as follows: the large three-dimensional coordinate measuring device with laser tracking comprises a measuring machine, a laser tracker and a calculation control system as well as a laser interferometer for measuring linear displacement, wherein the measuring machine is provided with a horizontal arm capable of doing x-direction movement and a main shaft capable of doing z-direction movement; the other end of the horizontal arm is provided with a corner prism; one end of the main shaft is provided with a measuring head rotating body which is provided with a measuring head; the other end of the main shaft is provided with a target and an angle measuring device; and a temperature measuring element which is used for carrying out temperature compensation is stuck on the main shaft. The invention is mainly applied in three-dimensional coordinate measurement.

The invention discloses an RCM mechanism for a mechanical arm of a laparoscopic minimally invasive surgical robot. The RCM mechanism disclosed by the invention comprises a connecting rod I, a connecting rod II, a connecting rod III, a connecting rod IV, a connecting rod V, a connecting rod VI, a linear motion output mechanism I, a linear motion output mechanism II, a rotation output mechanism and surgical instruments, wherein the six connecting rods form double parallelogram mechanisms. According to the RCM mechanism, motions of the surgical instruments including linear displacement freedom degree T, deflection freedom degree P and rotation freedom degree Y are correspondingly realized through the driving actions of the linear motion output mechanism I, the linear motion output mechanism II and the rotation output mechanism respectively; requirements of various freedom degrees to moment / torque of a driving mechanism are reduced through the double parallelogram mechanisms and the manner that the rotary centre axis of the rotation freedom degree Y and the connecting rod II form a certain included angle theta; the connecting rod III is directly pushed and pulled through the linear motion output mechanism II, so that the output moment / torque requirements to a freedom degree driving mechanism are reduced; and thus, the light weight and the miniaturization of the mechanical arm of the laparoscopic minimally invasive surgical robot are realized.