45 results about "Length contraction" patented technology

A seat restraint system whose torso belt includes an inflatable structure that inflates upon impact to protect the occupants of a vehicle such as an automobile. The torso belt is secured to an anchor arm that is pivotally mounted on a side surface of a seat of the vehicle or a side structure of the vehicle. The anchor arm is rotationally biased to remove slack in the torso belt and locks up in the event of a vehicle crash or sudden stop. The inflatable structure is linked to a gas generator and crash sensor. The gas generator may be mounted in the seat or within the anchor arm itself. When an impact above a predetermined level of severity is detected, the gas generator is ignited, inflating the inflatable structure which contracts in length as it inflates. In a preferred embodiment, the inflatable structure is a braided tube. As the braided tube inflates, the diameter of the tube increases significantly and its length decreases significantly, due to the orientation of the fibers comprising the braided tube. The contraction in length pretensions the seat belt system by pulling any additional slack out of the seat belt systems. In a frontal impact, the inflated structure restricts the forward motion of an occupant and distributes crash loads over a larger occupant surface area to reduce both primary and secondary injuries. In a side impact, the inflated structure passes over the occupant's shoulder, restricts occupant motion, distributes crash loads and provides head and neck protection.

A method of measuring a terahertz wave includes the steps of: starting input of a pulse signal showing that scale marks have been detected, which are arranged at equal intervals along a moving direction of a movable stage which can move in a direction in which an optical path length of incident pulse light is contracted or extended; and taking signals outputted at pulse intervals of the pulse light from a terahertz wave detecting section by synchronizing the timing with the pulse signal.

An egg package assembly includes a protective case that contains predetermined number of eggs and a sleeve that fixedly surrounds the protective case. The protective case comprises a base and a lid. The sleeve comprises a thin packing film that is shrunk by heat. The sleeve is provided having a length similar to that of the case and a width wider than that of the case. After heat shrinking, the sleeve conforms to the shape of the case and fixed to the case. The length of the sleeve shrinks and allows the ends of the case to be exposed.

The present invention provides an activating device which is provided with a shape memory alloy. The activating device with the shape memory alloy comprises the following components: a base; a plurality of sliding blocks which are installed on the base; a carrier which is installed on the plurality of sliding blocks; the shape memory alloy which is installed outside the plurality of sliding blocks and surrounds the sliding block; and an elastic component which is positioned on the carrier and surrounds the periphery of carrier, wherein, the length of shape memory alloy is reduced through the process of martensite transformation and austenite transformation of shape memory alloy. The shape memory alloy extrudes the sliding block for moving the sliding block inwards. The carrier is caused to move inwards and compress the elastic component. The invention uses the length reducing of shape memory alloy caused by the process of martensite transformation and austenite transformation to makes that the sliding block, the carrier and the elastic component act respectively. Furthermore the heat conductivity of base is used for accelerating the heat dissipation of shape memory alloy for increasing the action reaction rate of carrier.

The invention relates to an optical imaging lens and an electronic device applying the optical imaging lens. The optical imaging lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens from an objective side to an image side, wherein the lenses are all provided with an objective side face facing to the objective side and an image side face facing to the image side, the first lens has a negative refractive index, and the second lens has a positive refractive index and is provided with a convex face portion located in an area nearby a circumference; the objective side face of the third lens is provided with a concave face portion located in an area nearby the circumference, and the image side face is provided with a convex face portion located in an area nearby the circumference; and the image side face of the fourth lens is provided with a convex face portion located in an area nearby an optical axis, and the objective side face of the fifth lens is provided with a concave face portion located in an area nearby the optical axis. The electronic device comprises a casing and an image module, wherein the image module comprises the optical imaging lens, a lens cone, a module rear base unit and an image sensor. The lens provided by the invention has good optical performance under the condition of length contraction.

The invention relates to a multi-purpose safe-type hanging-type folding table board mounted through a brace rod of a headrest, and belongs to a placement device for various traffic tools (such as an automobile, a ship, an aircraft and the like) equipped with seats for passengers with independent headrests and adjustable height. The invention aims to provide the hanging-type folding table board provided with collision safety prevention design and being capable of being stably mounted on various seats for passengers equipped with independent headrests and adjustable height at any moment, so as to meet the practical demand of back-row passengers for safely and reasonably placing objects. The multi-purpose hanging-type folding table board has the following key points: 1. the brace rod of the headrest is taken as an installation foundation, so that the overall reliability, stability and convenience in mounting the device are guaranteed; 2. a slide sleeve of a guide rod and a slide rail of the brace rod are matched, so that the folding action of the plane of the table board is completed; and 3. the length contraction and guide action of the pneumatic brace rod are utilized for adsorbing overload collision, so as to achieve the function of overload collision safety.

The invention relates to an optical imaging lens. The optical imaging lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens, wherein the first lens, the second lens, the third lens, the fourth lens and the fifth lens are arranged in sequence from the object side to the image side. The first lens has a positive refractive index. The second lens has a negative refractive index, wherein the object side face of the second lens is provided with a convex part located in the area nearby an optical axis, and the image side face of the second lens is provided with a concave part located in the area nearby the circumference. The object side face of the third lens is provided with a concave part located in the area nearby the circumference, and the image side face of the third lens is provided with a convex part located in the area nearby the optical axis. The object side face of the fourth lens is a concave surface. The image side face of the fifth lens comprises a concave part located in the area nearby the optical axis and a convex part located in the area nearby the circumference. The invention further provides a portable electronic device which comprises an enclosure and an image module installed in the enclosure, wherein the image module comprises the optical imaging lens, a lens cone, a module pedestal unit, a substrate and an image sensor. According to the portable electronic device and the optical imaging lens of the portable electronic device, the lens still can have good optical performance under the condition of length contraction.

The present invention provides an actuation device having a shape memory alloy component. The present invention utilizes a length contraction occurred to the shape memory alloy component during its phase transformation from martensite to austenite. The length contraction causes a slider, a carrier and a base to move relatively. Also, the present invention utilizes thermal conductivity of the base to speed up heat dissipation of the shape memory alloy component, so that response time for actuating the carrier can be reduced.

The present invention provides a hydraulic pressure actuator having an inner tube and a mesh sleeve covering the outer periphery of the inner tube and longitudinally extendable by pressure fluid fed into the inner tube, wherein a low friction body formed in an elastic cylindrical body by knitting fine fibers is disposed between the inner tube and the mesh sleeve, and the low friction body contributes to an increase in the life of the hydraulic pressure actuator repeatedly performing extension/retraction motions. The hydraulic pressure actuator is used as an actuator for driving a CPM device which supports the extremity of a human body by at least one of a plurality of members combined with each other and performs the rehabilitation of the joints of a handicapped by operating the member.

The invention discloses a device and a method for measuring a reheating linear shrinkage ratio of ultra-thin glass through a laser method. The device comprises an L-shaped rack body, a heating furnace, a laser sensor, a quartz support, a quartz pushrod, a quartz rod and the like, wherein an electric lifting mechanism which is used for adjusting top and bottom positions of the heating furnace is mounted on a vertical rack of the L-shaped rack body; an X, Y and Z three-dimensional movable platform which is used for adjusting the laser sensor is mounted on the top of the vertical rack of the L-shaped rack body; when the test is carried out, a glass test sample is put in the special quartz support, and the quartz support is put in the heating furnace, the length shrinkage variation before andafter heating of the glass test sample is monitored by the laser sensor in real time, and the length shrinkage variation is divided by the original length of the glass test sample so as to obtain thereheating linear shrinkage ratio of the glass test sample. According to the device and the method disclosed by the invention, monitoring is carried out by using the high-accuracy laser sensor in realtime, so that the problems of errors caused by a human operation such as a scribing method and low microscopic observation accuracy are avoided, and a relatively simple and feasible testing method anddevice are provided for measuring the ultra-thin glass with the low shrinkage variation ratio of less than or equal to 10ppm.

This invention relates to two apparatus and one method for use in spooling composite coiled tubing onto a coiled tubing reel. One apparatus includes the modification of tubing reel cores currently in common use by the direct adhesion of a compliant material to the hub. Another apparatus modifies the commonly used tubing reel hub by affixing several panels concentric to the hub and mounted on compression springs. The method entails the pressurization of the composite coiled tubing prior to spooling onto the tubing reel, and subsequently releasing the pressure within the composite tubing after it has been spooled onto the tubing reel. Both apparatus and the method protect the reel core by absorbing or eliminating the radially inward forces of the composite tubing resulting from the pressurization and corresponding contraction in length of the spooled composite coiled tubing.

The invention discloses a leg rehabilitation instrument, which comprises a machine body, a motor, a support frame, a power supply device and a control device, wherein the machine body comprises a pedaling plate, a protection tool, an electrode plate and a resistance regulator; the pedaling plate is connected with the motor, and is driven by the motor to rotate; the resistance regulator is electrically connected with the control device and prevents the rotation of a motor fly wheel; the lower limb of a patient is limited and fixed by the protection tool; the electrode plate is fixed onto the inner side of the protection tool and is in contact with and connected with the lower limb of the patient; the support frame comprises a vertical rod, a first circular ring and a second circular; a plurality of first safety belts for fixing the waist of the patient are arranged on the first circular ring; a plurality of second safety belts for fixing the armpit and the shoulder of the patient are arranged on the second circular ring. The leg rehabilitation instrument has the advantages that the muscle equal length contraction training, passive training, active training and load bearing trainingcan be performed by the patients; various training measures are used for performing comprehensive rehabilitation on the sick limbs; the sick limbs are rehabilitated and trained from the first stage inthe whole process; the best sick limb rehabilitation effect can be reached.

The invention relates to a strength training and information feedback device, in particular to an infrared ray super-equal-length lower fixing turning core strength training and information feedback device. The infrared ray super-equal-length lower fixing turning core strength training and information feedback device aims to solve the problems that no turning core stabilization strength training device for achieving super-equal-length contraction of muscles exists currently and information of motion parameters can not be fed back. An arc surface of a balance base and a base are in rotatable connection; a chassis is fixed to the upper end face of the balance base; a pedal and the chassis are connected through a vertically arranged fixing shaft; the upper end of the fixing shaft and the lower end face of the pedal are fixedly connected; the lower end of the fixing shaft and the chassis are fixedly connected; the fixing shaft at the lower end of the pedal is sleeved with a shaft sleeve; a rotatable damper is installed between the fixing shaft and the shaft sleeve; the lower end of a rotary frame and the outer end face of the shaft sleeve are fixedly connected; the upper end of the rotary frame is provided with two rotary handles; the signal output ends of two distance measuring sensors are connected with a first distance signal input end and a second distance signal input end of a control circuit. The infrared ray super-equal-length lower fixing turning core strength training and information feedback device is used for turning strength training.

The invention relates to a large-scale, multi-cylinder, two-cycle crosshead diesel engine (10), comprising one bent shaft (1), said bent shaft is assembled with a plurality of cranks (2) connected with each other through main journal (5), and main journal is supported by one main bearing. Every crank comprises two arms (3) connected by crankpin (4). Said arm is connected to main journal through one contraction connection, said contraction connection comprises main journal end in pore of arm. The maximum axial thickness of crank arm (T1, T2,..., Tn) and length contraction connection are determined according to each crank. The length of main journal bearing (M1, M2,..., Mn+x) are determined respectively. The cylinder pitch and main journal pitch are changeable and suited to each crank and main journal. So the weight and length of crank and engine (10) are reduced.

A suspension device for a vehicle includes a spring device disposed between a sprung member and an unsprung member of a vehicle and allowing a relative displacement between the sprung member and the unsprung member. The spring constant k2c of the spring device when the spring device is deformed in the direction in which the spring device contracts with respect to the predetermined reference length is configured to be smaller than the spring constant k2e of the spring device when the spring device is deformed in the direction in which the spring device expands with respect to the predetermined reference length. Consequently, it is possible to obtain a characteristic opposite to the spring characteristic of the seat, and as a result, ride quality can be improved.

The invention discloses a colored spun yarn coloring machine capable of preventing fibers from length contraction due to water absorption. The colored spun yarn coloring machine capable of preventingthe fibers from length contraction due to water absorption structurally comprises yarns, a pay-off device, a machine body, a driving device, a take-up device, a support frame and a shock absorption support, wherein the bottom of the machine body is mechanically connected with the support frame; and the pay-off device is mounted on one side of the machine body. Compared with the prior art, the colored spun yarn coloring machine capable of preventing the fibers from length contraction due to water absorption has the beneficial effects that the colored spun yarn coloring machine is provided witha plurality of stations, a plurality of single yarns can be colored at the same time, the coloring time is short, the speed is high, a whole roll is prevented from being dipped and dyed, the coloringis uniform, pay-off dyeing and the coloring take-up are synchronous to apply certain tension to the yarns, the fibers are effectively prevented from length contraction due to water absorption, the effective diameter is prevented from being increased, the dyeing time is greatly shortened, the yarns expanded after coloring can be squeezed, extra dye is further squeezed out, the yarn dyeing concentration is effectively prevented from being too high, and dyestuff is saved.

A thermal-powered reciprocating-force motor includes a shutter switchable between a first position that passes solar energy and a second position that blocks solar energy. A shape memory alloy (SMA) actuator is coupled to the shutter to control switching thereof between the shutter's first and second position. The actuator is positioned with respect to the shutter such that (i) solar energy impinges on the SMA when the shutter is in its first position so that the SMA experiences contraction in length until the shutter is switched to its second position, and (ii) solar energy is impeded from impingement on the SMA when the shutter is in its second position so that the SMA experiences extension in length. Elastic members coupled to the actuator apply a force to the SMA that aids in its extension in length until the shutter is switched to its first position.

The invention relates to stretcher reconstruction and provides a telescopic boat-shaped stretcher applicable for standard series elevators, aiming at solving the problem that it is difficult for traditional stretchers to pass in and out of elevators. The stretcher is characterized in that a lying board of the stretcher is boat-shaped in general; two sides of the lying board are straight lines, and two ends are elliptical curves with one end being relatively sharp which is half of an elliptical curve divided by a short axis, and with the other one being relatively obtuse which is half of an elliptical curve divided by a long axis. the stretcher is provided with a head lying board, a intermediate lying board, and a foot lying board; among the three lying boards, the intermediate board is an intermediate sleeve made of a stainless sheet steel with thickness of about 3mm and is provided with a vertical rib plate and a hook-head block device; the vertical rib plate can increase the stiffness and improve the structure, and the hook-head block device enables orderly relative motion with constraint of the three lying boards; parts of the head lying board and the foot lying board can be retracted into the intermediate lying board and therefore length contraction is realized.