275results about How to "Avoid stiffness" patented technology

A chair and standing device includes a mechanism for allowing movement in an individual's hips and lower back while seated in a chair or standing in one's workstation, by letting the pelvis glide unabated through an apparatus made up of a series of balls, round springs or magnets built into a two pad chair seat cushion. Two pads under the respective ilia of the person preferably move in a forward & rearward glide pitch, roll, yaw and opposing medial glide enhanced by a ¼″ to ⅜″ raised platform in the center of the apparatus. The chair allows the pelvis to move in a gliding motion that mimics walking while the person is seated or standing, thus reducing the structurally caused lower back pain and stiffness so commonly associated with long periods of standing or sitting.

A pneumatic tire according to the present invention includes blocks on its tread which are segmented by plural circumferential grooves 3 extending along a tire circumferential direction and plural lateral grooves 5 extending along a tread width direction. Circumferential sipes extending along the tire circumferential direction are provided in the blocks. Inside circumferential sipes extend straight along a tire radial direction and outside circumferential sipes extend along the tire radial direction in zigzag patterns. According to the present invention, a handling performance, especially, a cornering performance can be improved regardless of road surface conditions.

Disclosed is a sliding type multifunctional traction frame for lower limb skin traction which comprises a thigh support, a shank support, a fixed mount, a lifting lever, an adjusting device, a hauling cable, a bonding belt, a massage belt and an electric aerating device, wherein the shank support comprises a crossing member and a shank sliding tube, the shank sliding tube is provided with a traction rod, a connection rope is arranged between the thigh sliding tube and the shank sliding tube, the lower end of the lifting lever is connected with the adjusting device, the massage belt is placed on the outward surface of the suffered limbs, the massage belt and the suffered limbs are secured with the bonding belt, the massage belt can perform loose massage to the suffered limbs and prevent the common complication effectively.

A hydrodynamic bearing device is provided for use with a spindle motor. The hydrodynamic bearing device has a sleeve made of a sintered metal that is obtained by sintering a sintering material that is iron, an iron alloy, copper, a copper alloy or a mixture thereof. This sintered metal has independent pores, which do not communicate with each other, by selecting conditions for forming a desired sintered body within a predetermined range. The conditions includes a grain size of powdered metal of a material for the sintered metal, a molding pressure when the molded body is formed, sintering temperature and sintering period in the sintering step.

The invention discloses a four-degree-of-freedom parallel robot with a double-acting platform structure. The four-degree-of-freedom parallel robot with the double-acting platform structure comprises afixed platform, four driving devices, four branched chains and a movable platform component. The four driving devices are arranged on the fixed platform, and each driving device comprises a driving arm and a driving unit which is used for driving the driving arm to pivot; the four branched chains are spaced along the circumferential direction of the fixed platform and are connected with the fourdriving arms in a one-to-one correspondence mode, and the upper end of each branch chain is connected with the driving arm through a first hooke joint; and the movable platform component is arranged below the fixed platform, the movable platform component is connected with the lower ends of the four branched chains, each branched chain is connected with the movable platform component through a second hooke hinge, and the movable platform component comprises an outer movable platform, an inner movable platform and a rotating screw rod. The four-degree-of-freedom parallel robot with the double-acting platform structure can realize a three-movement and one-rotation freedom-degree in one space, and has the characteristics of good dynamic performance, high whole machine rigidity, high output end positioning precision, high rotary angle precision and the like so that the high-speed and high-precision operation can be easily realized.

The invention relates to a reinforced concrete platy stair with a simple sliding support and a construction method, which belong to the field of civil engineering and are mainly used for building engineering. The reinforced concrete platy stair is a cast-in-place concrete platy stair, the upper end of a stair section plate and an upper-end supporting component connected to a main body structure are in integral casting, and the simple sliding support is arranged at the lower end of the stair section plate. The method includes that the stair section plate and a lower-end supporting component or a stair beam bridging piece are separately provided with bars and are in pouring separately, the lower end of the stair section plate is shelved on the lower-end supporting component, the upper surface of the lower-end supporting component is a smooth and flat horizontal plane, a plastic film isolating layer is fully laid on the horizontal plane, so that the lower-end supporting component is isolated from the lower end of the stair section plate, the sliding support is formed and is used as a pouring bottom formwork at the lower end of the stair section plate during construction, and the lower end of the stair section plate is also isolated from a building surface layer of the supporting component. The problem that the stair is broken in advance during earthquake and adverse influences to the main body structure are avoided due to the sliding support, earthquake damage is relieved, and the reinforced concrete platy stair is simple, economical and durable, and can be widely used for multiple high-rise building structures and particularly concrete structures.

A surgical method for gastrocnemius muscle reduction is provided. The method may search for a motor nerve associated with a gastrocnemius muscle of a patient, inserts a probe by penetrating an epidermis around the motor nerve and locates a tip of the probe in the motor nerve, stimulates the motor nerve through supply of an electric signal to the probe, thereby shutting down the motor nerve.

A horizontal rotary torso exercising apparatus allows a user to strengthen the core muscles of the body and obtain maximum flexibility of the spine without squeezing or pinching the intervertebral discs or nerves. The apparatus is comprised of a frame supporting a longitudinally adjustable bench covered by a contoured pad. The contoured pad follows the natural curvature of the spine by providing a raised lumbar region with lateral pads. A rod is supported by the frame with two collars including bearings. At one end of the rod is a rack for holding weights and at the opposite end is a height adjustable leg rest. The user lies supine on the bench, places knees over the leg rest, and rotates the lower body at the waist side to side through a number of repetitions. The movement rotates the leg rest, the rod, and the rack about the axis of the rod.

A guide arrangement for a roof element on an opening vehicle roof which includes a guide web connected to the roof element and a guide claw, having two opposing guide surfaces, which engages the guide web in such a manner that the guide surfaces lie on the guide web. The guide claw also includes an elastic element which provides adjustment for one of the two guide surfaces, such that the separation between the two opposing guide surfaces may be altered to provide tolerance adjustment.

The invention discloses a self-adjustment leg muscle massage wheelchair which comprises a seat. A front leg supporting seat and a rear leg supporting seat are in hollow structures and hinged to the right lower corner of the seat, a massage cushion is connected to the right side of each leg supporting seat, an elastic plate is arranged in each leg supporting seat, the right end face of each elasticplate is connected with the corresponding massage cushion through springs, a plurality of massage hammers are uniformly arranged on the right end face of each elastic plate, right ends of the massagehammers are abutted against the massage cushions, and magnets are arranged on the elastic plates respectively. Second slide rails are arranged on inner left side walls of the leg supporting seats, right sides of the second slide rails are in slide connection with iron blocks respectively, a second speed reducing motor is arranged at the top of each leg supporting seat, a motor shaft at the bottomend of each second speed reducing motor penetrates the top of the corresponding leg supporting seat to connect with a screw rod, and each screw rod penetrates the corresponding iron block and is in threaded connection with the same. By magnetic force of the magnets and elastic force of the springs, the massage hammers vibrate side to side, and the vibration force is transmitted through the massage cushions to massage leg muscles of a patient so as to promote leg blood circulation of the patient.

The invention belongs to the field of mechanical measurement and provides an acoustic excitation non-contact modal testing system and method. The problem that the conventional modal testing result for a thin-slab structure is inaccurate is solved in a non-contact modal testing mode. According to the technical scheme, the method comprises the following steps: giving a sound by using a loudspeaker, generating vibration through a non-contact excitation thin-slab testing piece, measuring an acoustic signal by using an acoustic sensor, and measuring the vibration response of the thin-slab testing piece by using a scanning-type laser vibration measurement system in a laser non-contact way; by taking the acoustic signal measured by the acoustic sensor as an input signal and taking the vibration response measured by the scanning-type laser vibration measurement system as an output signal, performing analysis through conventional modal analysis software in the scanning-type laser vibration measurement system to obtain modal parameters of the thin-slab testing piece. The system and the method have the benefits that the influence on additional quality and additional rigidity is avoided in a modal test performed by using the system and the method, and the accurate modal parameters can be obtained; meanwhile, the structural damage to the testing piece is avoided, and the testing effect is good.

The invention provides a large-amplitude free vibration wind tunnel test device with three degrees of freedom, and belongs to the technical field of wind tunnel test devices for bridges. The large-amplitude free vibration wind tunnel test device which is a large-amplitude free vibration wind tunnel test device with three degrees of freedom coupling for bridges comprises a rigid test model, a rigidround bar, a rigid suspension arm, arc blocks with grooves, light high-strength strings, linear extension springs, fixed pulleys and a bearing. The large-amplitude free vibration wind tunnel test device has the advantages that the problem of incapability of guaranteeing the linear vertical rigidity, the linear torsional rigidity and the linear lateral rigidity due to down warping of lateral springs horizontally arranged in the traditional vibration test device with three degrees of freedom and lateral tilting of vertical springs under large-amplitude conditions can be effectively solved by the aid of the large-amplitude free vibration wind tunnel test device; the large-amplitude free vibration wind tunnel test device is simple and is convenient to mount, initial attack angles are easy toadjust, down warping and tilting of the springs are prevented in vibration procedures, accordingly, the linear rigidity and stable vibration frequencies of systems still can be guaranteed even in large-amplitude vibration procedures, and research on the three-dimensional nonlinear pneumatic characteristics of the bridges becomes possible under large-amplitude conditions.

The invention discloses a plate spring, a plate spring set and a compressor, wherein the plate spring comprises two elastic arms and a fixing device used for installation and positioning; the structures of the two elastic arms are same and are formed by tangency of a plurality of concentric circular arcs or eccentric circular arcs; the radii of the plurality of concentric circular arcs or eccentric circular arcs increase from inside to outside gradually, and all the concentric circular arcs or eccentric circular arcs are located on the same straight line; the initial ends of the two elastic arms are tagent, and an inner fixing hole is formed in the connection position of the two elastic arms which are uniformly distributed taking the inner fixing hole as the center; the tail ends of the two elastic arms are connected with fixing device respectively. The plate spring has smaller equivalent mass and higher inherent frequency and rigidity. The plate spring set comprises a plurality of plate springs, and the rigidity among relative moving parts can be improved. According to the compressor, the plate spring set is adopted, so that the rigidity among the relative moving parts is improved, the weight is light, and the service life is long.

The present invention is concerned with a building system comprising i) at least first and second hollow blocks each having at least one side wall, and at least two end walls extending in at least one common direction, at least one of the walls in each block having a given thickness and being provided with a first cut-out extending throughout said wall thickness at a first free end of said wall, and ii) at least one connector element defining a cylindrical hollow body having a shape and size conforming with a perimeter corresponding to a juxtaposition of said first and second cut-outs for snug engagement within the perimeter, and at least one first flange projecting from a first end of the body and at least one second flange projecting from a second end of the body, said first and second flanges defining an intermediate spacing substantially equal to twice the value of said thickness. Thereby, the first block can be connected to the second block for erecting structures by registering cut-outs of adjacent walls against each other and connecting said adjacent walls together by snugly positioning the connector element in the cut-outs with first and second flanges abutting respectively on inner faces of each of the adjacent walls.

The invention discloses an armor apparatus of a multimodal consciousness promoting system for passive rehabilitation training of patients in vegetative states and relates to the field of medical instruments. The armor apparatus comprises a set of armor covering the whole human body. Ankle joints, knee joints, hip joints, shoulder joints and elbow joints of the armor are respectively connected with each other movably. Motion simulation driving mechanisms are respectively arranged between parts, at movably connected positions of the ankle joints, the knee joints, the hip joints, the shoulder joints and the elbow joints, of the armor. The armor is combined of two halves of casings which are closed with each other; one side of one half of casing is hinged to one side of the other half of casing; close lockers are arranged between the other sides of the two halves of casings; and close driving mechanisms are arranged at hinged positions of the two halves of casings. With the armor apparatus, infective complications and the like can be avoided while neural restoration is achieved for consciousness promoting. The armor apparatus is of high automation degree as different driving mechanisms thereof are controlled to work by a smart system.

The invention discloses an auxiliary stent for puncture, and relates to the technical field of auxiliary stents for medical hemostatic balloons. Specifically, the auxiliary stent comprises a clampingplate, a fixed tube sheet and a hemostatic balloon, wherein a first threaded mouth is formed in the bottom of the clamping plate, a first threaded rod penetrates the interior of the first threaded mouth, and a fixing clamping plate is connected to the top of the first threaded rod; a second threaded mouth is formed in the top of the clamping plate, a second threaded rod penetrates the interior ofthe second threaded mouth, and a bearing is connected to the inner end of the second threaded rod; and the fixed tube sheet is fixed to the top of a connecting piece, and the hemostatic balloon is arranged inside the fixed tube sheet. According to the auxiliary stent for puncture, a lower pressing plate can be lifted vertically so as to adjust the distance between the lower pressing plate and thebottom of the inner wall of an arm placing tube, arms of different thickness and size can be clamped conveniently through the arrangement, an observation skylight is formed in the middle of the arm placing tube, the observation skylight can be used for observing the situation of the puncture site of the arms in real time, and meanwhile air circulation inside the arm placing tube can be maintainedconveniently.

The invention belongs to the technical field of viscous-elastic materials, and particularly relates to a viscous-elastic material with significant changes in damping controlled by a magnetic field. The invention further provides a preparation method of the viscous-elastic material. The viscous-elastic material is characterized in that the viscous-elastic material is prepared from polyhydric alcohol, magnetic particles, diisocyanate, a reinforcing agent, an organo-metallic catalyst, an accelerant and a stabilizing agent. The viscous-elastic material is good in adjustability, can work in a vibration reduction mode requiring high loss capability and a large loss factor and also work in a vibration isolation mode requiring a small loss factor according to the requirements of a vibration reduction and isolation device, and can be applied to vibration, impact and noise control isolation devices in the field of vehicles, machines, aviation, aerospace, shipping and coasts, construction, etc.

An experimental setup for bridge deck large-amplitude vertical-torsional coupled free vibration in wind tunnel test, which belongs to the technical field of wind tunnel test apparatus. The experimental setup includes the rigid model, the rigid circular rods, the lightweight rigid circular sprockets, the chains, the linear tensile vertical springs, the bearings, the sliders, and the guides. For the new setup, large-amplitude vertical-torsional coupled free vibration of a rigid deck model that failed in conventional testing device can be adapted by the vertical deformation of the springs without any lateral tilt. As a result, the possible nonlinear mechanical stiffness due to the springs tilt in conventional testing device is excluded. In addition, owing to the low rolling friction and damping between the sprockets and the chains, the mechanical damping ratio of the system are quite low and stable for very large-amplitude vibrations.

The invention discloses an intelligent frequency conversion control method for a circulating fan during tobacco leaf curing in a descending bulk curing barn. After tobacco leaves are loaded into a curing barn as required and begin to be cured, an intelligent variable-frequency regression equation is constructed according to the following ten conditions in sequence, and the intelligent variable-frequency regression equation is constructed according to changes of parameters such as the target dry-wet bulb temperature, the actual dry-wet bulb temperature and the upper and lower shed tobacco leaftemperature difference set in each stage. According to the importance and contribution degree of the target dry bulb temperature difference (a), the upper and lower shed temperature difference (b) andthe wet bulb temperature difference (c) in each baking stage to the tobacco leaf baking process, coefficient assignment is conducted, the coefficient range is 0-1, and beneficial guarantees are provided for improving the softness of tobacco leaves, increasing the aroma and oil content of the tobacco leaves, enhancing the chromaticity of the tobacco leaves and avoiding stiffness.

The invention discloses an intelligent frequency conversion control method for a circulating fan during tobacco leaf curing in an ascending type bulk curing barn. After tobacco leaves are loaded intoa curing barn as required and begin to be cured, an intelligent variable-frequency regression equation is constructed according to the following ten conditions in sequence, and the intelligent variable-frequency regression equation is constructed according to changes of parameters such as the target dry-wet bulb temperature, the actual dry-wet bulb temperature and the upper and lower shed tobaccoleaf temperature difference set in each stage. According to the importance and contribution degree of the target dry bulb temperature difference (a), the upper and lower shed temperature difference (b) and the wet bulb temperature difference (c) in each baking stage to the tobacco leaf baking process, coefficient assignment is conducted, the coefficient range is 0-1, and beneficial guarantees areprovided for improving the softness of tobacco leaves, increasing the aroma and oil content of the tobacco leaves, enhancing the chromaticity of the tobacco leaves and avoiding stiffness.

The invention relates to a finishing method of imitated silk pure cotton yarn-dyed fabric, which sequentially comprises the following procedures: singeing, desizing, mercerizing, shaping, calendaring and preshrinking. The main technical characteristics of the finishing method are as follows: a liquid ammonia treatment procedure and a high-temperature washing procedure are added between the mercerizing procedure and the shaping procedure, and a glucose washing procedure is added between the shaping procedure and the calendaring procedure. In the invention, by adding the liquid ammonia treatment procedure, the high-temperature washing procedure and the glucose washing procedure, the finished pure cotton woven fabric has a hand-feeling style of imitated silk effect; and clothes prepared by the fabric are comfortable and beautiful to wear, thus promoting the grade of the pure cotton woven fabric.