1689 results about "Leaf spring" patented technology

A body support structure includes a base, a seat and a backrest, with the backrest connected to the base with a torsion leaf spring. The torsion leaf spring may be configured with a plurality of fingers, and / or one or more flex regions. One or more struts may be connected between the seat or backrest and the base. In another aspect, the seat and / or backrest may be supported with one or more links that provide a counter-intuitive motion. In another aspect, a link may be coupled to a support with a flexible blade.

The invention belongs to the technical field of plate spring performance analysis and evaluation, and discloses a high-strength two-stage gradual-change-stiffness plate spring performance analysis and evaluation system and method.The method comprises the steps that plate spring initial mechanical data collection and heterogeneous load response integrated processing are conducted on the basis of a multi-dimensional vehicle-mounted test experiment, and plate spring integrated mechanical response data are generated; performing double-rigidity gradient recognition analysis to generate rigidity transformation critical data; performing critical region stress field deconstruction analysis to generate stress field distribution characteristic data; carrying out local microstructure change characterization to generate structural deformation data; constructing a multi-scale stress transfer link, and generating critical region stress transfer path data; performing fatigue damage accumulative mapping to generate accumulative feature data; constructing a fatigue life prediction model, and generating life prediction data; carrying out comprehensive performance index quantitative evaluation to generate a performance evaluation result; executing plate spring optimization improvement scheme generation and verification; and a scientific basis is provided for performance optimization of the two-stage gradual-change-rigidity plate spring.

An actuator includes a movable body including: a disk-shaped magnet, a pair of disk-shaped yokes fixed to front and back surfaces of the disk-shaped magnet, a pair of spring retaining parts connected at one ends to the disk-shaped yokes, respectively, and connected at other ends to central portions of circular leaf springs, respectively, and a protruding part protruding in an axial direction of the disk-shaped magnet from the other end of one spring retaining part of the pair of spring retaining parts; and a fixing body including: a coil disposed at an outer circumference of the movable body, and a case including an opening portion through which the protruding part is inserted, the case accommodating the coil and the movable body such that a protruding end side of the protruding part protrudes to an outside.

A solenoid includes a first fixed iron core and a second fixed iron core located on a first end side and a second end side of an axial direction of a coil, a first movable iron core and a second movable iron core located therebetween and attracted by the first fixed iron core and the second fixed iron core by passage of current through the coil, respectively, a spring housed in a spring chamber formed on the first fixed iron core side of the first movable iron core and biasing the first movable iron core to the second fixed iron core side, a leaf spring that regulates movement of the first movable iron core to the second fixed iron core side with respect to the second movable iron core, and a throttle passage that causes the spring chamber to communicate with outside.

To provide a pressing spring device capable of outputting a high load in a saved space.SOLUTION: A pressing spring device 1 comprises a first leaf spring 11 and a second leaf spring 12 extending in a length direction X, and a length of an intermediate part 24 of the second leaf spring along a surface of the second leaf spring in a view in a plate width direction Y is shorter than a length of an intermediate part 23 of the first leaf spring along a surface of the first leaf spring in the view in the plate width direction. A manufacturing method of the pressing spring device includes: a first leaf spring forming step of forming the first leaf spring; and a bonding step of bonding both ends 21 of the first leaf spring in the length direction to both ends 22 of the second leaf spring in the length direction. In the first leaf spring forming step, the first leaf spring is formed in such a manner the size of the first leaf spring in the length direction becomes larger than the size of the second leaf spring in the length direction. In the bonding step, both the ends of the first leaf spring in the length direction are bonded to both the ends of the second leaf spring in the length direction in a state where the first leaf spring is elastically deformed so as to reduce the size of the first leaf spring in the length direction.SELECTED DRAWING: Figure 3

The invention relates to the technical field of part detection, and discloses a rapid detection device for automobile parts, which comprises a supporting table assembly, a rotating disc is rotatably connected in the supporting table assembly, and arc-shaped grooves I are formed in the edge of the rotating disc in an array manner and are used for accommodating a steel plate spring to be detected; a feeding assembly is arranged on the front side of the supporting table assembly, pushing assemblies are arranged in the rotating disc in an array mode, a driving assembly is arranged above the pushing assemblies, a detection assembly is arranged on the right side of the supporting table assembly, and a discharging assembly is arranged on the left side of the driving assembly. The steel plate spring is pushed into the detection hopper through the arc-shaped push plate so that the steel plate spring can be attached to the surface of the measuring cloth belt, the first camera shoots the scale, located on the measuring cloth belt, of the end of the steel plate spring so that the length of the steel plate spring can be detected, and meanwhile the second camera shoots from the upper portion so that the arc height of the steel plate spring can be measured. Therefore, the purpose of high steel plate spring detection efficiency is achieved.

The invention provides a relay contact pressure debugging method and device, equipment and a storage medium. A moving contact of the relay is arranged on the leaf spring, one end of the leaf spring is connected with the first part, and the moving contact is far away from or close to the static contact by rotating the first part. Before debugging, a first distance between a moving contact and a static contact is determined on the basis of a target debugging pressure under the condition that the target debugging pressure is applied to the moving contact on the leaf spring in the direction away from the static contact, and a first angle is determined on the basis of the first distance; the first angle can indicate a first angle that the first part needs to rotate under the condition that the leaf spring does not elastically deform and the moving contact of the leaf spring horizontally moves by a first distance. Therefore, after the first angle is calculated in advance, the moving contact can be close to the static contact and the pressure applied to the static contact by the moving contact is the target debugging pressure only by controlling the first part to rotate by the first angle along the specific direction, so that the debugging process is saved, and the production efficiency is improved.

A disc brake for a utility vehicle includes a brake caliper that is in the form of a sliding caliper and overlaps a brake disc; two brake pads which are located in the brake caliper, can be moved in opposite directions in the direction of the brake disc, each have a pad backing plate and a friction lining fastened thereto, and are each located in a pad shaft of a vehicle-side brake carrier, which pad shaft is delimited in the direction of rotation of the brake disc by brake carrier horns; and at least one restoring device by which the brake pads can be restored after a braking-related movement and release of the brake. The restoring device has at least one restoring element which is attached to a brake pad, is located between the brake pad and a stationary component, and exerts a restoring force on the brake pad, the at least one restoring element being in the form of a leaf spring which is fastened on the rear side of the pad backing plate facing away from the friction lining and has a spring arm which extends in the peripheral direction of the brake disc and is supported against the brake carrier as a stationary component.

The invention relates to the technical field of intelligent unmanned ships, in particular to a wave self-adaptive unmanned ship, a self-adaptive control system and a control method.The wave self-adaptive unmanned ship comprises a main ship body, a front arch, a rear arch, a suspension system, a propelling nacelle, a rigid sliding plate and a buoy, the main ship body is connected with the rear arch and the front arch, and the rigid sliding plate is fixed to the buoy; the propulsion nacelle is installed at the tail of the rigid sliding plate, the rear arch and the rigid sliding plate are installed through two bearings perpendicular to each other, the suspension system comprises a rocker arm, a plate spring and a TPMLM actuator, the rocker arm is connected to the rigid sliding plate, the plate spring and the TPMLM actuator are connected between the rocker arm and the rigid sliding plate and support the rocker arm to be in an upward inclined posture, and the rear arch is connected to the rigid sliding plate. The front arch is connected with the rocker arm, the plate spring and the TPMLM actuator are installed in parallel in the vertical direction, the TPMLM actuator is used for outputting active control force for restraining movement of the ship body, and the unmanned ship, the self-adaptive control system and the self-adaptive control method have the advantages that wave loads can be actively counteracted, and therefore movement restraining is achieved.

The invention discloses an active lubrication brake cylinder for a railway wagon and the railway wagon, and relates to the field of railway wagon control systems.The active lubrication brake cylinder comprises a fixed gear ring arranged at the bottom of a spinning cylinder body, and a piston is arranged in the spinning cylinder body; the matching gear ring and the fixed gear ring are arranged in parallel, and the side, facing the fixed gear ring, of the matching gear ring is a convex tooth surface; the projection of the S-shaped spiral elastic pieces in the axial direction of the piston is in a circular arc shape, one ends of the S-shaped spiral elastic pieces are connected with the side, away from the fixed gear ring, of the matched gear ring, the S-shaped spiral elastic pieces are symmetrically arranged in the circumferential direction of the matched gear ring, and the other ends of the S-shaped spiral elastic pieces are connected with a base of the piston; the brake cylinder structure meets the modification of the existing brake cylinder, is simple in structure and low in modification cost, and also has good manufacturability and maintainability.

The invention relates to a stepped-structure three-level rigidity non-equal-length automobile suspension steel plate spring and a design method thereof, and belongs to the technical field of steel plate springs. The device is of a step structure and comprises a first-stage plate spring, a second-stage plate spring and a third-stage plate spring which are arranged from top to bottom, and the action lengths of the first-stage plate spring, the second-stage plate spring and the third-stage plate spring are sequentially reduced. The three-stage stepped plate spring support is arranged in a matched mode, and the first-stage plate spring, the second-stage plate spring and the third-stage plate spring are designed in different parabolas; according to the method, it is guaranteed that the inherent offset frequency of the plate spring is always within a reasonable range from the no-load process to the full-load process, and therefore the consistent comfort of the empty vehicle and the full-load vehicle is guaranteed; the three plate spring pieces reasonably distribute the design stress of each stage of plate spring according to the load change borne by each plate spring piece, and the equal-strength and equal-service-life design of each stage of plate spring is guaranteed; except for the middle part, all the stages of plate springs do not make contact with one another, friction between pieces is eliminated, the dynamic stiffness is reduced, and the plate spring vibration reduction effect is improved.

The invention provides a loading safety monitoring method and system for a rear-loading vehicle and the vehicle. The method comprises the following steps that the arc height variable quantity of a plate spring of the vehicle in the current loading state is collected; based on the arc height variable quantity, a vehicle total weight estimated value is obtained through calculation; based on the axle load estimation values of the front axle and the rear axle and the axle distance of the vehicle, estimating the current gravity center height of the vehicle, and dynamically compensating the gravity center height according to the dynamic state parameters; and calculating a stability risk coefficient of the vehicle according to the total weight estimated value of the vehicle and the compensated gravity center height so as to carry out early warning. Displacement sensors are arranged on a front plate spring and a rear plate spring of a vehicle to collect arc height variation in real time, an axle load and a vehicle total weight estimated value are calculated based on a pre-calibrated plate spring rigidity coefficient, the gravity center height of the vehicle is estimated to evaluate the stability of the vehicle, and meanwhile the gravity center height is dynamically compensated based on dynamic parameters in the driving process. The evaluation precision under complex working conditions is improved, and the transportation safety is guaranteed.

The present invention relates to a spring seat attachment assembly for an axle / suspension system having at least one leaf spring and an axle, the attachment assembly comprising a band and a spring seat. The band may include a locator structure and is secured to the axle and extends between 180 degrees and 360 degrees around a portion of the axle. The spring seat receives the leaf spring and is secured to the band.

The invention relates to the technical field of vehicles, and particularly discloses a combined type air suspension system and a vehicle, the combined type air suspension system comprises a vehicle frame, a plate spring assembly, a connecting shaft, a longitudinal thrust assembly and a gas elastic piece, the plate spring assembly comprises a plate spring body, a front support and a rear support, and the plate spring body is provided with a front spring eye; the front spring eye is rotatably arranged on the front support, a plurality of connecting positions are arranged on the front support, and the plate spring body is provided with a rear spring eye which is rotatably arranged on the rear support. The connecting shaft is arranged on the plate spring body, the longitudinal thrust assembly comprises a longitudinal thrust rod and a base, the base is arranged at the connecting position of the plate spring body and the connecting shaft, one end of the longitudinal thrust rod is rotationally connected with the base, and the other end of the longitudinal thrust rod can be selectively rotationally connected with or separated from any connecting position. The gas elastic piece is arranged between the base and the frame, so that the motion trail of the connecting shaft can be finely adjusted, the guiding characteristic is improved, and the transverse vibration of the whole system is reduced.

The invention relates to suspended spindle body integrated automatic assembling equipment which comprises a main machine frame and a circulating conveying line, and each moving table of the circulating conveying line is fixedly connected with a positioning carrier. A supporting piece double-station feeding and assembling mechanism, a support overturning and feeding mechanism, a coaxial deviation rectifying mechanism, a first pin feeding and assembling machine, a first pin in-place installation detection mechanism, a rotor feeding and side inserting mechanism, a second pin feeding and assembling machine, a second pin in-place installation detection mechanism and a leaf spring feeding mechanism are sequentially arranged on the main machine frame around the circulating conveying line. The device comprises a leaf spring pressing mechanism, a leaf spring detection mechanism, a defective product unloading mechanism and a finished product unloading mechanism. The automatic assembling and detecting device has the beneficial effects that the automatic assembling, detecting and discharging device can adapt to automatic assembling, detecting and discharging treatment of supports, supporting pieces, pins, rotors and leaf springs, and the machining efficiency and the machining quality of suspended spindle bodies are improved.

The invention provides a modeling and KC analysis method for a double-front-axle balanced suspension. The modeling method comprises the steps that the structural form of the double-front-axle balanced suspension is determined; constructing a plate spring model of the double-front-axle balanced suspension; under the structural form, hard point coordinates in the double-front-axle balanced suspension are determined; and establishing the hard point coordinates in the plate spring model to obtain a corresponding balance connecting rod model, and assembling the balance connecting rod model to obtain an assembly body model of the double-front-axle balanced suspension. The KC analysis method comprises the following steps: newly adding a first-bridge and second-bridge reverse jumping working condition in a KC analysis project; and performing KC analysis on the assembly model of the double-front-axle balanced suspension on the basis of the first and second axle reverse jumping working condition to obtain a KC performance index of the assembly model under the first and second axle reverse jumping working condition. By means of the method and device, the defects existing in modeling and KC analysis modes of double-front-axle balanced suspensions and vehicle suspensions in the prior art are overcome.

The present invention discloses a novel combined vibration damping device with adjustable stiffness and damping, which relates to the technical field of vibration damping; it includes a magneto-resistive stress negative stiffness spring located inside the housing and a piezoelectric friction assembly located inside the bearing seat; a central shaft is connected between the two, and a metal helical spring is sleeved outside the central shaft. The bottom of the metal helical spring is connected to a spring base located at the top of the housing, and the top of the metal helical spring is connected to the bottom of the bearing seat; the central shaft is fixedly connected to the top inside the housing through a metal cross leaf spring. The magneto-resistive stress negative stiffness spring and the metal cross leaf spring can be connected in parallel to achieve the adjustment of quasi-zero stiffness, and the piezoelectric friction assembly can achieve the adjustment of damping; a load platform is fixedly arranged at the top of the bearing seat. The present invention has non-linear frequency-varying characteristics of high static stiffness - low dynamic stiffness, large low-frequency damping - small high-frequency damping, and can well solve the contradiction between the bearing capacity and the vibration damping frequency band, as well as the contradiction between high-frequency and low-frequency vibration attenuation, and achieve high-performance vibration damping.

The utility model discloses a gas inlet end plate structure of a fuel cell stack, belongs to the field of fuel cells, and solves the problem of non-uniform distribution of assembly force of the fuel cell stack in the prior art. According to the invention, the electric pile is located between the air inlet end plate and the tail end plate, and the two ends of the electric pile are in tight pressing contact with the air inlet end plate and the tail end plate respectively; a plate spring combined part is arranged between the tail end plate and the end part of the electric pile; the part, facing the electric pile, of the plate spring combined part is a plane part, and the part, facing the tail end plate, of the plate spring combined part is an elastic part; the plane part of the plate spring combined part is attached to the end part of the galvanic pile, and the elastic part of the plate spring combined part is arc-shaped and is in tight pressing contact with the surface, facing the galvanic pile, of the tail end plate. According to the air inlet end plate structure of the fuel cell stack, the distribution uniformity of stack assembling force is effectively improved, and the mass power density and the stack consistency of the fuel cell stack are improved.

The invention discloses a solid rocket engine in-situ heat preservation ignition test run frame which comprises a fixing base, a movable fixing plate, a supporting assembly, a force bearing pier, a first force transmission piece, a second force transmission piece, a force measuring piece, a heat preservation bottom plate and a heat preservation cover. A solid rocket engine to be tested is movably arranged on the movable fixing plate through the two supporting assemblies, and the movable fixing plate is connected to the fixing base through the multiple plate springs. The heat preservation bottom plate is arranged on the lower side of the movable fixing plate, the heat preservation cover is buckled on the heat preservation bottom plate, cold air is conveyed into the heat preservation cover through the cold air connector, the solid rocket engine to be tested can be cooled, and when the temperature of the solid rocket engine to be tested reaches the temperature required by testing conditions, the movable door is opened, and the solid rocket engine to be tested is ignited. And the force measuring piece can obtain thrust data of the solid rocket engine. The solid rocket engine in-situ heat preservation ignition test run rack can accurately simulate the thrust test of the solid rocket engine in an ultralow-temperature working environment.

The invention relates to the technical field of railway vehicles, and provides a bullet train bogie and a railway vehicle, and the bullet train bogie comprises a framework and a wheel drive system. The framework comprises a bearing body and two plate springs, a center pin channel is formed in the middle of the bearing body, two installation channels are formed in the bearing body in the longitudinal direction of the framework, and the two plate springs are installed in the two installation channels respectively. The wheel driving system comprises a shaft core, a shaft sleeve and two wheels, the shaft core is rotationally installed in the shaft sleeve, a gear box is constructed on the shaft sleeve, a driving tooth is arranged in the gear box, the shaft core is sleeved with a driven tooth, the driving tooth is externally meshed with the driven tooth, and the two wheels are installed at the two ends of the shaft sleeve through bearings respectively and connected with the two ends of the shaft core through flexible plates respectively. Cushion blocks are arranged at the two ends of each plate spring respectively, and the cushion blocks are connected with the shaft sleeves. And the bearing main body and the plate spring replace the original cross beam and side beam structure, so that the lightweight effect of the framework is obvious.

The present invention relates to an escapement mechanism (1) arranged to supply mechanical impulses from a driving source to an oscillating regulator (2) of a clock movement via a leaf spring (6) operating in buckling around an inflection point (I). The mechanism comprises a winding rocker (10), a release rocker (12), and a locking rocker (14). The leaf spring (6), in normal operation, is capable of accumulating energy from the driving source transmitted by winding elements (40a, 40b) during a winding phase, remaining in a wound state during a locking phase, and then releasing the accumulated energy to the oscillating regulator (2) during a pulse phase preceded by a release phase. The locking rocker (14) comprises two locking arms (56a, 56b), each equipped with a locking member. (58a, 58b) arranged to cooperate with a locking member (46a,46b) respective complement of the cocking lever (10) to block said cocking lever (10) during the locking phase. Each locking arm (56a, 56b) of said locking rocker (14) has, at its free end, an inclined plane (66a, 66b) configured to cooperate with the starting inclined plane (61a, 61b) provided correspondingly on the arming rocker (10) during a self-start phase during which an activation of the drive source causes the arming rocker (10) to move, the free passage of which is permitted by the locking rocker (14) which was previously positioned by the detent rocker (12) under the influence of the oscillating regulator (2) at rest, said angular movement of the arming rocker causing a displacement of the locking rocker (14) by pushing one of the starting inclined planes (61a, 61b) on the corresponding inclined plane (66a, 66b) of the locking rocker (10),so that said locking lever (14) rotates the oscillating regulator (2) out of the lifting angle, the escapement mechanism (1) positioning itself in a position corresponding to a locking phase ready to be followed by an unlocking phase and a pulse phase of normal operation.

The invention belongs to the technical field of elastic element manufacturing, and relates to a special-shaped plate spring and a manufacturing process thereof, in particular to a manufacturing process of a spring used in an ultrahigh vacuum environment. The process comprises the following steps: selecting a 07Cr17Ni7Al plate as a raw material; performing laser melting cutting blanking according to the shape and the size of the special-shaped plate spring plate blank; carrying out solution treatment on the blanked plate blank; carrying out punch forming and bending forming; the formed semi-finished product is subjected to aging treatment; and cleaning the surface after polishing. The manufactured special-shaped plate spring is reliable in work, good in temperature resistance, long in service life and capable of being used in an ultrahigh vacuum environment, the temperature resistance of the special-shaped plate spring can reach 250 DEG C, and the service life of the special-shaped plate spring is 600000 times or above.

Motor-vehicle suspension system (1), comprising a transversal leaf spring (2) arranged transversely with respect to the longitudinal direction of the motor-vehicle, connected to the motor-vehicle structure by means of two elastic blocks (5) symmetrically arranged at respective intermediate portions (2''') between the center of the leaf spring (2) and its end portions (2''), said transversal leaf spring (2) being configured as a foil spring adapted to oppose the vertical movements of the two wheel supports (4). The suspension system (1) also comprises a transversal active block (17) comprising: - a support body (18) having opposite end parts (18') connected to the elastic blocks (5) and a main part (18'') extending along a central portion (2') of the foil spring between the two elastic blocks (5), - an elastomeric component (19) mounted on said main part (18''), defining an internal chamber fillable with a pressurized fluid, connectable to a pressurized fluid supply system, - wherein said elastomeric component (19) is activated following filling of the internal chamber, to switch from an inactive configuration in which the outer surface of the foil spring is not in contact with the elastomeric component (11), to an active configuration in which the elastomeric component (19) has an enlarged volume for creating an abutment surface in contact with the foil spring.

The invention discloses a relay, which comprises a push rod assembly, a movable contact assembly and an elastic assembly, and is characterized in that the movable contact assembly comprises a movable contact piece; the elastic assembly is connected to the push rod assembly and the movable contact assembly and is used for providing contact pressure for the movable contact piece; the elastic assembly is provided with a first fulcrum and comprises a first leaf spring and a second leaf spring. In the over-travel process, the push rod assembly extrudes the elastic assembly, and the push rod assembly has an over-travel initial position and a first transition position in sequence relative to the position of the movable contact. Before the push rod assembly moves from the over-travel initial position to the first transition position, the first leaf spring deforms with the first fulcrum as the rotating point and is provided with a first force arm. And at the first transition position, the first leaf spring is in contact with the second leaf spring.

The invention relates to the technical field of precise positioning control, in particular to a two-degree-of-freedom large-stroke motion platform applied to wafer detection, which comprises a base platform and a load platform surface, the top surface of the base platform is provided with a linear motion platform and a rotary motion platform which are coaxially arranged, the linear motion platform is used for driving the load platform surface to do lifting motion, and the rotary motion platform is used for driving the load platform surface to do rotating motion. The rotary motion table is used for driving the linear motion table and the load table top to do circular motion, and the linear motion table comprises a linear actuator, an air floatation guide assembly, a first feedback device and a plate spring. The integrated design is adopted, the Z shaft and the Rz shaft are coaxially arranged and share the same air floatation guide assembly, the number of parts is effectively reduced, the axial space is compressed, the structure is more compact, the size of equipment is reduced, the self weight and the assembly difficulty are reduced, non-mechanical-friction guide is achieved, and the influence of friction on precision is avoided; besides, the plate springs distributed in a single layer achieve flexible decoupling through the axial and radial rigidity difference of the plate springs, motion crosstalk is restrained, and the dynamic response speed can be increased without a complex algorithm.

A vibration motor, including a housing with a receiving space, a stator assembly fixed in the housing, a vibrator assembly received in the housing and driven by the stator assembly to vibrate, and a leaf spring connecting the housing and the vibrator assembly. The leaf spring includes an outer fixed portion fixed to the housing, an inner fixed portion fixed to the vibrator assembly, and an elastic arm connecting the outer fixed portion and the inner fixed portion. The elastic arm extends from the inner fixed portion to the outer fixed portion in a manner of rotating around the inner fixed portion. The vibration motor further includes damping glue arranged between two adjacent elastic arms for adjusting vibration damping of the vibrator assembly. The vibration motor of the present disclosure reduces material costs and improves reliability and consistency of a product.

The utility model relates to the technical field of goods lift falling prevention, and discloses a high-strength anti-falling safety device suitable for goods lifts.The high-strength anti-falling safety device suitable for goods lifts.The high-strength anti-falling safety device comprises an elevator shaft, a transverse plate is fixedly connected to the top of the elevator shaft, a traction assembly is arranged on the upper portion of the transverse plate, a lift car is arranged in the middle of the elevator shaft, and an anti-falling assembly is arranged at the top in the lift car; protection assemblies are arranged on the two sides of the interior of the lift car, and an elevator door is installed outside the lift car. The anti-falling assembly comprises a plate spring, the plate spring is fixedly connected to the inner top of the lift car, a U-shaped ring is fixedly connected to the middle of the plate spring, and fixing frames are fixedly connected to the two sides of the inner top of the lift car. According to the elevator traction assembly, when the steel rope of the elevator traction assembly is broken, the bottoms of the two rotating blocks are clamped in the sawtooth grooves formed in the exteriors of the two limiting blocks through the cooperation of the plate springs and the rotating blocks, the steel rope is prevented from falling rapidly, and safety is guaranteed.

A roller spring member for an overrunning clutch is provided. A first bridge connecting portion couples a bridge to a first spring central location of a first leaf spring. A second bridge connecting portion couples the bridge to a second spring central location of a second leaf. The roller spring member further includes at least one of, each of the first bridge connecting portion and the second bridge connecting portion including an undercut radius section, each of the first leaf spring and the second leaf spring being tapering from an associated one of the first spring central location of the first leaf spring and the second leaf spring central location of the second leaf spring to a first end and a second end, and each of the first leaf spring and the second leaf spring including a straight portion proximate the central locations.

A bolt assembly for securing a passive door panel relative to an entryway frame. The bolt assembly has a base to be fixedly mounted relative to the passive door panel, a catch attached to the base with a leaf spring to deflect relative to the base, and a bolt which is able to translate relative to the base between a retracted position and an extended position for securing the passive door panel. The bolt is biased toward the extended position and selectively maintained in the retracted position by the catch.

The utility model discloses a swing check valve, which relates to the field of valve technology. The technical solution thereof is mainly as follows: it comprises a valve body, mounting flanges are arranged on both sides of the valve body, a valve cover is arranged on the top of the valve body, a rocker is rotatably arranged in the valve body, a valve disc is fixedly arranged on a remote lever, a leaf spring is arranged on the end side of the valve disc away from the rotating shaft of the remote lever, the leaf spring is arranged obliquely away from the valve disc, a support block corresponding to the leaf spring is arranged in the valve body, a pushing assembly movably connected to the valve disc is arranged on the valve cover, and the pushing assembly is used to push the valve disc to block the inlet of the valve body. The utility model arranges a leaf spring and a pushing assembly on the side of the valve disc away from the inlet of the valve body, and the leaf spring and the pushing assembly reduce the force exerted on the valve disc by the fluid, and at the same time, when the fluid pressure is reduced, the valve disc can be accelerated to block the inlet of the valve body to prevent the fluid from flowing back through the valve body.