278 results about "Compliant mechanism" patented technology

A micromanipulator comprising a tubular structure and a structural compliance mechanism that are formed from a tube made of an elastic and/or superelastic material. The micromanipulator is useful for intravascular interventional applications and particularly ultrasonic imaging when coupled with an ultrasound transducer. Also disclosed are medical devices for crossing vascular occlusions using radio-frequency energy or rotary cutting, preferably under the guidance of real-time imaging of the occlusion, as well as accompanying methods.

A suspended-load backpack designed to permit the load to move relative to the wearer during walking and running so that the large movements between the load and the wearer of the backpack reduce the fluctuations of vertical motion of the load with respect to ground. Because the hip (and thus the pack body) goes up a down a good deal during walking, a large relative movement between the wearer and the load reduces the absolute excursion of the load. This movement may be, in turn, transferred to a motor through, for example, a rack and pinion gear, to convert the mechanical movement to electrical or mechanical energy. Such movement of the suspended-load relative to the wearer also reduces the forces on the wearer's body while walking or running, thus reducing the likelihood of orthopedic injury. The suspended-load backpack includes a suspension system having a first portion connected to shoulder straps directly or through an interface and a second portion connected to the pack body and a compliant mechanism that permits the second portion of the suspension system and the pack body to move up and down relative to the first portion of the suspension system in accordance with a gait of the wearer of the backpack.

The invention discloses a two-degree-of-freedom piezoelectric driving nanometer positioning platform. The two-degree-of-freedom piezoelectric driving nanometer positioning platform is characterized in that an XY motion platform body is connected with a base through an X-axis full compliant mechanism, a Y-axis full compliant mechanism and a cross-shaped XY decoupling mechanism; laser ruler planar mirrors for checking X-direction motion and Y-direction motion are arranged on the side faces of the XY motion platform body and the base respectively; the laser ruler planar mirrors are matched with laser ruler reading heads for detecting X and Y directions respectively to finish the detection and feedback of two-degree-of-freedom motion of the nanometer positioning platform together; piezoelectric ceramic drivers are embedded into the X-axis full compliant mechanism and the Y-axis full compliant mechanism respectively. The two-degree-of-freedom piezoelectric driving nanometer positioning platform has the beneficial effects that flexible hinges are taken as a kinematic pair, and motion is transmitted and decoupled through micro-deformation, so that clearance errors introduced in an assembly process are reduced, and the accuracy of motion transmission is increased.

A MEMS actuator includes a coil stack in the form of microfabricated, electrically conductive first and second superposed layers. A magnet array is superposed in magnetic communication with the coil stack, with first and second coils being selectively, electrically actuatable to generate relative movement between the coil stack and the magnet array both in-plane and out-of-plane. In various embodiments, a plurality of the actuators are integrally coupled to a microfabricated compliant mechanism to provide a high bandwidth, six degree of freedom nanopositioner.

The embodiment of the invention provides a soft robot system which is applicable to detection operation of complex environments and unknown fields, based on SMA, self-feedback and SSMA driving, combines external feedback, and matches soft joints and rigid joints. The modules namely an SSMAs driver element module, a flexible mechanism module and foot SMA driver modules are provided, wherein electric current flowing through SSMAs is adopted to control the telescopic length of the SSMAs so as to control the integral contraction of the robot; the parallel structure of SMA and SSMA realizes SMA self-feedback and the external feedback of the SSMA, so that the accurate control on the soft robot is realized; an external 3D shell is used for connecting the front rigid part with the rear rigid part of the robot, so that the soft robot system has better flexibility; a square spring supports a flexible silica gel shell to provide restoring force and other power; two groups of SMA driver modules in front of and at back of each foot structure are controlled respectively, so that the feet motion is realized, and the motion of the robot is realized along with other units.

A laser resonator is provided that includes a cavity bounded by an end mirror and output coupler, and one or more gain media between the end mirror and output coupler. The laser resonator also includes a modal corrector mirror between the end mirror and output coupler. The modal corrector mirror includes a controllable-profile faceplate including an optically-treated front surface, and an array of static actuators. Each static actuator includes an adjustable element, and a compliant mechanism located between the adjustable element and faceplate. The adjustable element is configured to exert a selectable, localized push-pull force on the faceplate via the compliant mechanism, and the compliant mechanism is configured to scale the respective force.

The invention discloses a space micro-gripper based on compliant mechanisms. The space micro-gripper comprises plane gripping branch chains with a symmetric structure and microprobes. Five pairs of symmetric circular flexible hinges are adopted in the gripping branch chains to achieve two stages of amplification of input displacement of the space micro-gripper, wherein three pairs of flexible hinges are symmetrically distributed on the two sides to achieve the first stage of amplification of input displacement, and the other two pairs of flexible hinges are used for achieving the second stage of amplification. A clamping groove structure is adopted for perpendicularly and symmetrically assembling the two gripping branch chains in a cross form, the two gripping branch chains are connected together in the manner of nesting an upper groove and a lower groove so that the drive positions of the two gripping branch chains can be the same, and the two gripping branch chains are driven by one driver at the same time. Four gripping arms of the two gripping branch chains are each provided with one corresponding microprobe, the microprobes are sleeved with the gripping branch chains in a threaded connection manner so that the elongation of the microprobes can be adjusted, and adjustability of the size of a gripping opening is achieved. The four microprobes are symmetrically arranged to form the square space gripping opening, and when gripped objects are in four-point contact, objects in irregular shapes can be gripped. The designed space micro-gripper can be used for the fields of bioengineering, micro electro mechanical systems, nanoscale science and technology, optical engineering and the like.

The invention discloses a light beam precision pointing device based on a resolution multiplied compliant mechanism, comprising a mirror bracket component, a driving mechanism and a control mechanism. The mirror bracket component is connected with the driving mechanism through the resolution multiplied compliant mechanism, the resolution multiplied compliant mechanism comprises a base and a flexible hinge fixed on the base and the mirror bracket component is fixed at the top of the flexible hinge; the driving mechanism comprises two drive motors used for pushing the flexible hinge and fixed on the base and the two drive motors are symmetrically arranged at two sides of the lower part of the flexible hinge. The invention has the advantages of compact structure, convenient processing, simple assembling, no friction loss, no movement clearance, no need for lubrication, high locating precision, network control, simple and convenient use, high reliability, strong adaptability and wide application range.

The invention discloses a 3-PRR micro-displacement platform based on a symmetrical variable cross-section compliant mechanism, wherein three micro-displacement driving devices are all mounted on a fixed platform; three branch chains connecting a movable platform with the fixed platform are arranged evenly; and in each branch chain, a lever amplification mechanism is connected with the fixed platform through a flexible hinge and a symmetrical trapezoidal compliant mechanism is connected with the lever amplification mechanism through the flexible hinge. One end of the symmetrical folding leaf spring type compliant mechanism is connected with the lever amplification mechanism through the flexible hinge, while the other of the symmetrical folding leaf spring type compliant mechanism is connected with a rigid connecting rod through the flexible hinge; the rigid connecting rod is connected with the movable platform through the flexible hinge; and the movable platform is capable of realizing planar three-freedom degree micro-motion. The symmetrical trapezoidal compliant mechanism of the 3-PRR micro-displacement platform is capable of avoiding incomplete contact of the driving devices when the elastic resistance is as low as possible; as a result, the motion accuracy is improved; and due to the amplification function of the lever amplification mechanism of the 3-PRR micro-displacement platform and the low resistance feature of the symmetrical folding leaf spring type compliant mechanism, large stroke output of the micro-displacement platform can be realized.

The invention discloses a piezoelectric valveless micropump suction cup based on a parallel connection compliant mechanism. The piezoelectric valveless micropump suction cup based on the parallel connection compliant mechanism comprises a monocrystalline silicon substrate, a copper-based composite film, the compliant mechanism and a piezoelectric stack driver. The compliant mechanism is provided with a deformation displacement input part, a deformation displacement output part and a locating groove. The piezoelectric stack driver is fixedly clamped at a hollowed-out position in the upper portion of the deformation displacement input part and is closely attached to the deformation displacement input part. The copper-based composite film located on the upper layer and the monocrystalline silicon substrate located on the lower layer are bonded together and assembled through epoxy structure bonding glue to form a thin film micropump. The thin film micropump is clamped into the locating groove of the compliant mechanism and is sealed in a bonding mode. The lower end face of the deformation displacement output part is attached to the upper plane of the copper-based composite film in a bonding mode. The compliant mechanism amplifies unidirectional deformation displacement generated after the piezoelectric stack driver is powered on, and then transmits the unidirectional deformation displacement to the copper-based composite film to drive the thin film micropump to operate, gas in an adsorption cavity formed in the lower portion of the monocrystalline silicon substrate is extracted, and negative pressure of the suction cup is generated. The piezoelectric valveless micropump suction cup based on the parallel connection compliant mechanism is small in size, light in weight, free of noise, and capable of being used as an adsorption device of a wall-climbing robot.

A comb-tooth-shaped capacitor is a common structural type of a micro-actuator and a micro-sensor of MEMS devices. Gaps between teeth of the comb-tooth-shaped capacitor are only several micrometers, and a gap between a positive plate and a negative plate needs to be fine controlled. The invention provides a comb-tooth capacitor accurate assembly method based on a bi-stable state compliant mechanism. The comb-tooth capacitor accurate assembly method based on the bi-stable state compliant mechanism can improve fine control of the gap between the positive plate and the negative plate of the comb-tooth-shaped capacitor, so that a batch of MEMS devices with the same structure have the same and estimable capacitance, and uniformity of performance of the static MEMS devices at the time of lot manufacturing is improved.

The invention relates to a pneumatic serial-connection flexible hinge multi-finger paw of a compliant mechanism. The multi-finger paw consists of a palm and three flexible fingers, and the palm has a rectangular structure and a hexagonal structure; the structure of each flexible finger is identical, and each flexible finger structure mainly consists of an internal guide air cylinder and a serial-connection flexible hinge; the multi-finger paw is driven by an air cylinder to produce a grasping force, the multi-finger paw is applied to a fragile object or used for grasping a specially-shaped object with a varied shape and varied size; and the flexible finger of the multi-finger paw is a compliant mechanism, and the serial-connection flexible hinge is a deformation element of the compliant mechanism. The pneumatic serial-connection flexible hinge multi-finger paw has the characteristics that: a good flexible degree of freedom and good buffering performance can be realized for an outer load, and the flexible adaptability is good. The pneumatic serial-connection flexible hinge multi-finger paw belongs to the technical field of the robot and mechatronics; and the pneumatic serial-connection flexible hinge multi-finger paw is connected with a robot main body and particularly suitable for the production and logistics field such as the grasping, sorting and packaging of food, agricultural products and light products.

The invention relates to a static microrelay based on a bistable compliant mechanism, belonging to static relays used in a micro-electro mechanical system (MEMS). Bistable fully-compliant beams of the static microrelay adopt two compliant beams, wherein one end of the left compliant beam is fixed on a left insulated anchor point, and the other end of the left compliant beam is fixed on a member; one end of the right compliant beam is fixed on a right insulated anchor point, and the other end of the right compliant beam is also fixed on the member; under the voltage drive, a movable comb tooth drives the bistable fully-compliant beams to transversely move and rapidly overturn to a second stable position; a movable contact is in bridging connection with a left fixed contact and a right fixed contact which are fixed on a lower insulated anchor point so as to switch a circuit on; and the relay is rapidly skipped to return to a first stable position when an aelotropic driving voltage is applied. The static microrelay substitutes a traditional linear elasticity structure by adopting the bistable compliant mechanism so as to improve the response speed and the stable holding capacity and has the characteristics of simple mechanism, short-distance drive, low energy consumption and strong anti-jamming capacity.

The invention discloses a flexible mechanism with a negative poisson ratio characteristic. The flexible mechanism is formed by stacking a plurality of same flexible units, wherein the flexible units are symmetrical flexible Sarrus mechanisms. The flexible mechanism is characterized by comprising two same isosceles trapezoid flat plates and four same rectangular flat plates, wherein the six flat plates are connected through notch type flexible hinges to form a single-degree-of-freedom spatial six-rod flexible mechanism; the six flat plates are a first isosceles trapezoid plate, a second isosceles trapezoid plate, a first rectangular plate, a second rectangular plate, a third rectangular plate and a fourth rectangular plate respectively; the notch type flexible hinges are arranged on opposite sides of each flat plate; the flexible units are periodically stacked through a shared flat plate to form a hollow cylindrical flexible mechanism; when the flexible mechanism is subjected to pressure in the axis direction of a cylinder, the mechanism generates axis shrinkage and radial shrinkage; when the flexible mechanism is subjected to tension in the axis direction of the cylinder, the flexible mechanism generates axis extension and radial extension; and the flexible mechanism can be used in a precise snakelike robot to adjust the size of the robot.