A lacing device based on a swing arm structure

Abstract

The application provides a lacing device based on a swing arm structure, which realizes tightening and loosening of lacing by adopting a swing arm-groove-stop block structure, and the swing arm-groove-stop block structure provides a new type of anti-reversing structure for the lacing device, which not only enriches the types of automatic lacing devices, but also has excellent use reliability and durability.

Description

Technical Field

[0001] This invention relates to the field of lacing systems, and more specifically to a lacing device based on a swing arm structure. Background Technology

[0002] Most fastening mechanisms on the market currently employ a housing tooth-pawl structure to achieve unidirectional rotation. This structure utilizes the flexural deformation of the elastic arm to achieve unidirectional rotation and employs a mechanism to prevent material buckling to prevent reverse rotation. When the fastening mechanism rotates in reverse, the applied rotational force is axial stress. As long as the axial stress does not exceed the allowable stress, the pawl arm generally will not buckle. Even if the external force exceeds the ultimate yield strength, the housing teeth abut against the pawl arm, preventing radial outward buckling. Essentially, this structure utilizes the fact that the material's buckling strength is often greater than the external force to achieve the anti-reverse rotation effect.

[0003] Although the external force generally does not exceed the yield strength, unexpected situations can occur. Once the external force exceeds the buckling strength, the pawl arm will buckle and deform. This deformation is destructive and irreversible. Once the pawl arm buckles, the structure fails.

[0004] Although some fastening mechanisms use housing teeth to abut against the pawl arm to prevent buckling, the fastening mechanism is frequently subjected to reverse loosening forces during normal operation. These reverse loosening forces are pulsed forces. Even if the pulsed force itself is less than the yield strength of the pawl arm, the point-to-point contact between the housing teeth and the pawl arm results in relatively poor stress transmission and energy dissipation efficiency, inevitably leading to residual stress in the pawl arm. After frequent application of these pulsed forces, failure may occur even if the stress value never exceeds the strength limit of the pawl arm material, or even falls below the elastic limit; that is, fatigue failure; more specifically, normal fracture fatigue caused by normal stress.

[0005] To improve the reliability of the fastening mechanism against loosening forces during normal use, a fastening mechanism with a novel anti-reverse structure is needed. Summary of the Invention

[0006] This invention provides a tethering device based on a swing arm structure. The swing arm mechanism utilizes the bending deformation of the material to achieve swinging and yielding. The bending deformation causes less damage to the material strength, does not easily generate stress accumulation, and has excellent reliability and durability.

[0007] A lacing device based on a swing arm structure includes: a cap, a winding reel, and a housing. The cap is rotatably mounted on the housing, and the winding reel is supported by the housing and can rotate relative to the housing.

[0008] The screw cap is provided with one or more grooves;

[0009] The reel is configured to wind up the tether when rotating in the tension direction and release the tether when rotating in the unwind direction;

[0010] The housing is provided with one or more swing arms, each swing arm including at least a swing arm tooth and a swing arm beam, the swing arm including a first side and a second side opposite to each other; the swing arm tooth is configured to engage the screw cap groove when the swing arm is in its original position, and the swing arm beam and / or the swing arm tooth is configured to swing from its original position toward the first side of the swing arm, or from its original position toward the second side of the swing arm.

[0011] The housing is further provided with one or more stops, and at least the first side of the swing arm is adjacent to the stops; when the cap is subjected to an external force in the tensioning direction, the stops allow the swing arm beam and / or swing arm teeth to swing from their original position to the second side of the swing arm, so as to allow the cap to rotate in the tensioning direction;

[0012] When the cap is subjected to an external force in the opening direction, the stop is configured to prevent the rocker arm beam and / or rocker arm teeth from swinging toward the first side of the rocker arm, thereby preventing the cap from rotating in the opening direction.

[0013] In the above technical solution, the swing arm swings to the second side in accordance with the rotation of the cap in the tightening direction. The first and second sides of the entire swing arm are completely consistent with the orientation of the first and second sides of the swing arm teeth or swing arm beam; the swing arm teeth also include a first and second side, and the orientation of the first and second sides of the swing arm teeth is consistent with the orientation of the first and second sides of the swing arm beam or swing arm. For example, taking the central axis of the swing arm as a reference, the left side of the central axis is the first side, and the right side of the central axis is the second side; similarly, taking the central axis of the swing arm teeth as a reference, the left side of the central axis is also the first side, and the right side of the central axis is the second side. In other words, if the position when the swing arm teeth engage with the cap groove is called the original position, we call the direction of screwing the cap in the loosening direction the first side of the swing arm teeth, swing arm beam, and swing arm, and the direction of screwing the cap in the tightening direction the second side of the swing arm teeth, swing arm beam, and swing arm. The first and second sides are located on both sides of the original position.

[0014] "The swing arm beam and / or swing arm teeth are configured to swing from their original position to a first side of the swing arm" means at least one of the following three technical solutions: both the swing arm beam and the swing arm teeth swing from the original position of the swing arm to its first side; the swing arm beam swings from the original position of the swing arm to its first side; and the swing arm teeth swing from the original position of the swing arm to its first side. Similarly, "The swing arm beam and / or swing arm teeth swing from their original position to a second side of the swing arm" means at least one of the following three technical solutions: both the swing arm beam and the swing arm teeth swing from the original position of the swing arm to its second side; the swing arm beam swings from the original position of the swing arm to its second side; and the swing arm teeth swing from the original position of the swing arm to its second side.

[0015] When the swing arm beam and swing arm teeth are integrally formed and made of similar materials, the swing arm beam and swing arm teeth generally swing together. In technical solutions where the swing arm beam and swing arm teeth are formed separately or the materials have different elasticities, only the swing arm beam or swing arm teeth may swing and yield individually. However, the swing arm beam's yielding will generally cause the swing arm teeth to swing and yield as well.

[0016] When the swing arm teeth engage the cap groove, the swing arm is in its original position, and the swing arm in its original position is in a naturally extended state (i.e., both the swing arm beam and the swing arm teeth are in their original positions and are in a naturally extended state); when the cap is subjected to external force, during the process of the swing arm beam and / or the swing arm teeth swinging from their original positions to the first side or from their original positions to the second side, the swing arm beam and / or the swing arm teeth are in a state of flexural deformation.

[0017] Preferably, when the cap is subjected to an external force in the tensioning direction, the stop allows the swing arm beam and / or swing arm teeth to swing from their original position to the second side of the swing arm. At this time, the swing arm teeth slide along the side wall of the cap groove to allow the cap to rotate in the tensioning direction.

[0018] Preferably, when the cap is subjected to an external force in the loosening direction, the stop is configured to prevent the swing arm beam and / or swing arm teeth from swinging toward the first side of the swing arm, so that the swing arm teeth remain engaged with the cap groove to prevent the cap from rotating in the loosening direction.

[0019] Preferably, when the cap is subjected to an external force in the tensioning direction, the stop allows the swing arm beam and / or swing arm teeth to reciprocate from their original position to the second side of the swing arm, so as to allow the cap to rotate in the tensioning direction.

[0020] Preferably, when the cap is subjected to an external force in the tensioning direction, the cap groove is configured such that its sidewalls bias the rocker arm teeth, thereby forcing the rocker arm beam to deviate from its original position and swing to its second side, such that each rocker arm tooth disengages from each groove to allow the cap to rotate in the tensioning direction.

[0021] When the cap is subjected to an external force in the loosening direction, the sidewall of the cap groove biases the rocker arm tooth, causing the rocker arm beam to tend to swing from its original position toward the first side. However, the stop block prevents the rocker arm beam from swinging toward its first side, so that the rocker arm tooth and the knob groove always remain engaged.

[0022] "At least the first side of the swing arm is adjacent to the stop" means that the swing arm includes a first side and a second side. All the first sides of the swing arms are adjacent to the stop. The second side may or may not have a stop. Therefore, at least one side of the swing arm is provided with a stop, and this side is the first side.

[0023] Preferably, the screw cap is provided with protrusions along the circumference, the protrusions extend into the circumference, and the grooves are formed between adjacent protrusions.

[0024] Preferably, the screw cap is provided with protrusions along its circumference, and the protrusions extend radially inward along the circumference, forming the groove between adjacent protrusions. The radially inward extension of the protrusions includes the symmetrical protrusions extending radially along the circumference along the axis of symmetry or one sidewall of the protrusion extending radially along the circumference.

[0025] Preferably, the housing is provided with a swing arm along the circumference, and the swing arm teeth of the swing arm protrude outward radially along the circumference.

[0026] Preferably, when the cap is subjected to an external force in the tensioning direction, the swing arm beam swings from its original position to the second side, thereby moving the swing arm teeth away from the cap groove, that is, the swing arm teeth move from the engagement position to the disengagement position, so as to allow the cap and the winding wheel to rotate in the tensioning direction.

[0027] Preferably, the rocker arm tooth includes a tooth tip for engaging the groove.

[0028] Preferably, the rocker arm gear is integrally formed.

[0029] In the absence of a stop, the swing arm-groove structure in this application is configured to allow the cap to rotate in the release direction when a release force is applied to the cap.

[0030] Preferably, the orthographic projection shape of the tip of the rocker arm tooth matches the shape of the groove. Matching the orthographic projection shape of the tip of the rocker arm tooth with the shape of the groove allows the tip of the tooth to be inserted into the groove, thus achieving engagement between the rocker arm tooth and the groove.

[0031] Preferably, the rocker arm tooth is a symmetrical tooth or an asymmetrical tooth. A symmetrical tooth has the same slope on both sides of the tooth tip, while an asymmetrical tooth has different slopes on both sides of the tooth tip.

[0032] More preferably, the rocker arm teeth are asymmetrical teeth.

[0033] Preferably, the groove is a symmetrical groove or an asymmetrical groove. A symmetrical groove is one in which the orthographic projection shape of the groove is symmetrical, and an asymmetrical groove is one in which the orthographic projection shape of the groove is asymmetrical.

[0034] Preferably, the orthographic projection shape of the symmetrical groove is one of the following: isosceles triangle, semicircle, isosceles trapezoid, arch, wave, fan, rectangle, and square.

[0035] Preferably, the orthographic projection of each of the symmetrical grooves is substantially symmetrical along the radial direction of the circumference of the groove. The substantially symmetrical design means that, without the presence of a stop, when the rocker arm teeth engage the grooves and an external force is applied, the cap can rotate bidirectionally in both opening and closing directions; both perfect symmetry and slight variations can achieve bidirectional rotation of the cap.

[0036] Preferably, the symmetrical groove includes a first sidewall and a second sidewall, and the difference between the angle between the tangent of the straight line or the extension direction of the first and second sidewalls and the radius of the apex or the center of the apex of the groove is -10° to +10°.

[0037] Preferably, the one or more grooves are distributed along the circumference. The groove of this application includes a top and an open end, the open end facing the inner side of the circumference. The open end of the groove has two endpoints, the endpoint corresponding to the first side of the rocker arm tooth is called the first endpoint, and the endpoint corresponding to the second side of the rocker arm tooth is called the second endpoint.

[0038] Preferably, the first and second endpoints of each groove are located on the same circumference. This circumference is referred to below as the "groove endpoint circumference". This is what is meant by having one or more grooves distributed along the circumference.

[0039] Preferably, the groove is a circumferential groove or a segmented groove. A circumferential groove refers to a groove structure evenly distributed along the circumference at 360°. In some embodiments, the segmented groove consists of three grooved segments and three ungrooved segments, each segment being of equal length, and the grooved and ungrooved segments are spaced apart along the circumference. The first and second endpoints of each groove in both the circumferential and segmented grooves are located on the same circumference, also referred to simply as the "groove endpoint circumference".

[0040] Preferably, the central axis of the swing arm coincides with or is parallel to a certain radius of the circumference of the end of the groove.

[0041] Preferably, the asymmetrical groove also includes a first sidewall and a second sidewall.

[0042] Preferably, the angle between the straight line containing the second sidewall of the asymmetrical groove and the radius corresponding to the second endpoint on the circumference of the groove endpoint is 0° to 10°.

[0043] More preferably, the straight line containing the second sidewall of the asymmetrical groove extends along the radial direction corresponding to the second endpoint on the circumference of the groove endpoint.

[0044] Only when the second sidewall coincides with the radius or is within a 30° angle range can the force exerted by the second sidewall on the rocker arm teeth be primarily a bending force, with a smaller radial inward force. Combined with the stop's resistance to the rocker arm's bending deformation towards the first side, this ensures the cap cannot rotate in the loosening direction. Although an acute angle between the second sidewall and the circumference of the groove's end point is advantageous in preventing the cap from rotating in the loosening direction because it generates a force that causes the rocker arm teeth to press upward against the groove, if the angle exceeds 30°, the second sidewall will also exert upward resistance on the rocker arm teeth when tightening the cap in the tightening direction, thus hindering the cap's rotation in that direction. Therefore, this angle is best controlled within the range of 0–30°, ensuring smooth rotation of the cap in the tightening direction while preventing rotation in the loosening direction.

[0045] When the straight line containing the second sidewall of the groove in this application forms a positive acute angle with the radius corresponding to the second endpoint on the circumference of the groove endpoint, the so-called positive acute angle means that the second sidewall is located on the second side of the circumference radius.

[0046] Preferably, the straight line containing the first sidewall of the groove forms an angle of 45° to 80° with the radius corresponding to the first endpoint on the circumference of the groove endpoint. The first sidewall is located on the second side of the radius corresponding to the first endpoint on the circumference of the groove.

[0047] For asymmetrical grooves, the radius of the first sidewall corresponding to the first endpoint forms a large acute angle. In this case, the radial component of the force transmitted to the rocker arm teeth through the first sidewall is relatively large. Under the action of this radial component, the rocker arm beam will slide radially inward, while the lateral component perpendicular to this radial component will cause the rocker arm beam to swing towards the second side, causing the rocker arm teeth to move from the engagement position to the disengagement position. This allows the cap and the roll to tighten the strap in the tensioning direction. At the same time, the second sidewall is set to be parallel to the radius corresponding to the second endpoint. Thus, the force applied to the rocker arm teeth through the second sidewall has virtually no radial component. This prevents the rocker arm from sliding radially inward to make room. Also, since the stop block prevents the rocker arm from swinging towards the first side, the rocker arm cannot swing to make room either. As a result, the rocker arm teeth and the knob groove always remain engaged, and the cap and the roll cannot rotate in the loosening direction.

[0048] Preferably, the housing is further provided with a base, and the swing arm is fixedly mounted on the housing through the base.

[0049] Preferably, the base is an annular base, and the swing arms are evenly spaced on the circumference of the annular base.

[0050] Preferably, the base is a stretchable annular base.

[0051] Preferably, the retractable annular base includes a retractable portion and a fixing portion, wherein the retractable portion has a wavy or spiral structure. The fixing portion is used to fix the retractable annular base to the housing.

[0052] Although the wavy or spiral structure of the expandable part is not a regular circular arc structure, it can be defined as a expandable annular base because the expandable part and the fixed part form a closed loop.

[0053] Preferably, the head of each swing arm beam is adjacent to the swing arm tooth, and the tail is adjacent to the telescopic part.

[0054] Preferably, the retractable part includes at least one retractable segment.

[0055] More preferably, the retractable portion includes two or more retractable segments.

[0056] Preferably, each of the retractable segments is a wave-shaped structure or a spiral structure.

[0057] Preferably, the tail end of the swing arm beam is connected to at least one telescopic section.

[0058] More preferably, the tail portion of the swing arm beam is connected to two telescopic sections, which extend toward a first side and a second side of the swing arm beam, respectively.

[0059] Preferably, the connection between the tail of the swing arm beam and the two telescopic sections is in the shape of a three-pronged fork or an inverted Y.

[0060] The tail of the swing arm beam is connected to at least one telescopic section, which can improve the swing arm's ability to swing to both sides. Therefore, in the swing arm-groove structure of this application, the swing arm can swing to both sides without the stop block, and the screw cap can also rotate in both clockwise and counterclockwise directions.

[0061] Compared to ordinary ring bases, ring bases with extendable sections can not only improve the swing elasticity of the swing arm by compressing or extending in the circumferential direction, but also improve the radial clearance capability of the swing arm by achieving radial inward and outward extension through the crest and trough structure, so the actual feel is better.

[0062] For a typical annular bottom, one end of the swing arm is fixed (hereinafter referred to as the "fixed end of the swing arm"), and the other end is a free swing end, i.e. the end of the swing arm; since the end of the swing arm is toothed, the end of the swing arm is also called the swing arm tooth.

[0063] For the retractable annular base, although the retractable section allows the tail of the swing arm beam to swing slightly, the swing amplitude of the tail of the swing arm beam is very small compared to the swing arm teeth, so it can be considered as a relatively fixed end, while the swing arm teeth are a relatively free swing end.

[0064] The statement in this application that the housing is provided with one or more swing arms along the circumference means that the fixed end or the relatively fixed end of one or more swing arms is located on the same circumference of the housing.

[0065] More preferably, the crests of each of the stretchable segments of the wave-shaped structure are located on the same crest circumference.

[0066] More preferably, the troughs of each of the stretchable segments of the wave-shaped structure are located on the same trough circumference.

[0067] Alternatively, the crest circumference and trough circumference are concentric circles.

[0068] Preferably, the swing arm and the fixing part are evenly spaced on the base.

[0069] More preferably, the base is provided with three swing arms and three fixing parts.

[0070] Preferably, the fixing part is fixedly connected to the housing by a snap-fit ​​structure, a magnetic structure, or an adhesive.

[0071] Preferably, the swing arm is integrally formed with the base.

[0072] Preferably, the swing arm and its two adjacent telescopic sections are integrally formed.

[0073] Preferably, the extendable section can be a corrugated plastic component or a spring.

[0074] When the swing arm in this application swings to the second side along the tension direction, it is subjected to a bending force. According to the bending deformation mechanism of a cantilever beam, since the deflection of the bending deformation is related to the bending stiffness of the material and the magnitude of the external force, when the swing arm beam has high elasticity, only a small force is needed to cause a slight bending deformation. Because the hysteresis curve of the biased bending shear member is very full and has excellent energy dissipation performance, repeated biasing has little adverse effect on the pawl rotating along direction A. For a swing arm with a telescopic base, in addition to the bending clearance of the swing arm beam itself, there is also the elastic clearance of the telescopic section, which makes the swing arm swing easier and the internal stress is quickly dissipated. The stress is not easy to accumulate inside the swing arm beam and cause fatigue damage.

[0075] When rotating in the release direction, the rocker arm teeth are also subjected to bending force. Without the stop, this bending force would cause the rocker arm to swing and move out of position. However, the stop dissipates and cancels out the bending force transmitted from the rocker arm teeth. Since the stop is located on the first side of the rocker arm, when the cap is rotated in the release direction, the second sidewall of the groove applies an external force to the second side of the rocker arm teeth. Since the second side and the first side of the rocker arm are in the direction of the minor axis (perpendicular to the major axis), and since the rocker arm needs to have a certain degree of elasticity, the width in the direction of the minor axis is small. That is to say, the force applied by the second sidewall of the groove and the reverse force applied by the stop can be canceled out after a very short transmission distance, so there is basically no residual stress inside the rocker arm. On the other hand, the inclination of the two sides of the rocker arm teeth means that the force actually applied to the rocker arm by the second sidewall of the groove is mainly a force perpendicular to the axial direction (or only a force perpendicular to the axial direction), so there is also basically no stress generated and dissipated along the major axis inside the rocker arm. In summary, even if the cap is rotated in the loosening direction, there will be virtually no accumulation of residual stress inside the swing arm beam, and the probability of fatigue damage is relatively small.

[0076] Furthermore, the contact between the stop and the swing arm is a surface contact. The larger the contact surface, the faster the external force is consumed, and the stronger the ability to prevent the swing arm from swinging to the first side. Moreover, since the stop is directly mounted on the housing, the external force can also be dissipated to the entire housing through the stop. Therefore, compared with the existing ratchet and pawl anti-reverse structure, the swing arm-groove integral structure provided in this application has high energy consumption efficiency, less damage to the mechanical properties of the swing arm-groove structure from repeated biasing, and a long service life.

[0077] Preferably, the swing arm beam extends radially along the circumference of the swing arm. The radial extension of the swing arm beam along the circumference of the swing arm is defined as: the radial extension of the orthographic projection symmetry axis of the swing arm beam along the circumference of the swing arm.

[0078] The orthographic projection refers to the projection obtained by projecting a parallel projection line perpendicular to the projection plane onto the groove or swing arm, using the circumferential surface parallel to the groove or swing arm as the projection plane.

[0079] Preferably, the orthographic projection symmetry axis of the symmetrical rocker arm tooth extends radially along the circumference of the rocker arm.

[0080] Preferably, the stop is disposed adjacent to the first side of the one or more rocker arm teeth.

[0081] Preferably, the stop block and the swing arm are separately configured and correspond one-to-one.

[0082] Preferably, the minimum distance between the leading edge of the stop block and the endpoint of the groove is less than the average width of the cross-section of the swing arm. Here, the leading edge of the stop block refers to the side facing the groove, and the minimum distance between the leading edge of the stop block and the endpoint of the groove refers to the distance between the endpoint of the groove closest to the leading edge of the stop block (which may be facing more than one groove).

[0083] In this case, the stop is only provided on one side of the one or more swing arms, and the stop is only located on the same side of the swing arm teeth. The movement clearance mechanism of the swing arm described in this application is swing clearance. An external force is applied to the swing arm teeth, and the torque of the external force on the fixed end of the swing arm affects the swing state of the swing arm teeth. The greater the torque, the easier it is for the swing arm teeth to swing. The stop is fixed and separately provided on one side of the swing arm teeth, which is equivalent to forming a new fixed end. The lever arm of the external force on this new fixed end is reduced, so the torque is reduced. When the torque is small enough, the swing arm teeth will basically not swing. Therefore, when a loosening force is applied to the cap, the stop can prevent the swing arm teeth and the swing arm beam from moving to the side where the stop is located, thereby preventing the cap and the winding reel from rotating in the direction of loosening the strap.

[0084] In this application, both the stop and the swing arm are fixedly mounted on the housing. The stop and the swing arm are two independent components, rather than the stop being part of the swing arm. Since the fixed ends of the stop and the swing arm are both fixed to the housing, the stop can form a new fixed end point and have the function of adjusting the length of the lever arm.

[0085] More preferably, the minimum distance between the front edge of the stop block and the end point of the groove is less than the width of the cross section of the swing arm corresponding to the rear edge position of the stop block.

[0086] The swing-arm beam's oscillation clearance refers to the movement of the swing-arm beam from its original position towards the first side of the swing arm or from its original position towards the second side of the swing arm to make way for the groove. The entire or most part of the swing-arm beam shifts, primarily through oscillation clearance, causing the swing-arm teeth to oscillate clockwise or counterclockwise to allow the end point of the groove to pass over the tooth tip. While the displacement of the swing-arm beam is mainly oscillating, some radial deflection is also possible. The degree of radial deflection of the "swing-type" swing-arm beam is related to its material composition and structural design.

[0087] For a swing arm with a retractable annular base, when the cap is rotated in the tensioning direction, the first sidewall of the groove applies a component force (radially inward) along the axial direction of the swing arm beam and a torque along the tensioning direction to the swing arm teeth. Since the tail of the swing arm beam is connected to at least one retractable section, and this connection point is not fixed, based on the elastic characteristics of the retractable section, the connection point can move radially inward under the action of the axial external force transmitted from the swing arm beam, thereby causing the entire swing arm beam to move radially inward to make room. In summary, the swing arm with a retractable annular base, due to the elasticity of the retractable section, allows the tail of the swing arm beam to undergo a slight radial inward displacement. Combined with the swinging clearance of the swing arm beam itself, the two work together to allow the swing arm teeth to quickly and effortlessly make room for the groove when the cap is rotated in the tensioning direction. Compared to a swing arm with a normal annular base, which only requires the swinging clearance of the swing arm, the swing arm with a retractable annular base provides a better feel and is more effortless and smoother during use.

[0088] The swing arm beam's oscillation and yielding is an elastic deformation. Once the end point of the groove passes the tooth tip, the swing arm tooth swings back counterclockwise or clockwise and engages in the groove, thus advancing the groove one step in the direction of rotation. After each step, the swing arm tooth quickly swings back to its original position and re-engages with the groove to prevent the cap from rotating under force below the critical value.

[0089] Preferably, the rocker arm beam and the rocker arm gear are integrally formed.

[0090] Preferably, the swing arm beam extends radially along the circumference of the swing arm.

[0091] Preferably, the swing arm is a constant cross-section swing arm or a variable cross-section swing arm. A constant cross-section means that the cross-sectional area is equal at all positions along the entire length of the swing arm (excluding the tooth tips). A variable cross-section swing arm means that at least two positions along the entire swing arm have different cross-sectional areas.

[0092] Preferably, the length-to-diameter ratio of the constant cross-section swing arm is L / D. i The range is 4 to 12. Among them, D... i The diameter of the inscribed circle of the cross section of the swing arm is given.

[0093] Preferably, the constant cross-section swing arm includes one of a cylindrical swing arm, a prism swing arm, and a cylindrical swing arm. The cylindrical swing arm refers to a three-dimensional shape with arched top surfaces and cylindrical sides; the cylindrical swing arm refers to a three-dimensional shape with circular top surfaces.

[0094] Preferably, the maximum cross-sectional area of ​​the swing arm teeth in the variable cross-section swing arm is smaller than the cross-sectional area of ​​the fixed end of the swing arm.

[0095] Preferably, the variable cross-section swing arm is a frustum structure, which includes one of a truncated cone, a trapezoidal frustum, or a pyramidal frustum.

[0096] Preferably, the stop includes a first stop and a second stop, with the first stop adjacent to the first side of each of the one or more swing arms, and the second stop adjacent to the second side of at least one of the swing arms.

[0097] Preferably, the swing arm includes a swing arm tail portion, the first stop block is adjacent to the first side of the swing arm tooth, and the second stop block is adjacent to the second side of the swing arm tail portion.

[0098] In the embodiment where the groove rotates, the direction of the first side of the swing arm is the loosening direction of the lacing device; the direction of the second side opposite to the first side of the swing arm is the tightening direction of the lacing device.

[0099] When an external force is applied to screw on the cap, the torque of the external force on the fixed end of the swing arm affects the swing state of the swing arm teeth. The greater the torque, the easier it is for the swing arm teeth to swing. The first stop and the second stop respectively form new fixed ends. The lever arm of the external force is different for these two newly formed fixed ends. Since the swing arm teeth are closer to the point of application of the external force than the fixed end of the swing arm, the lever arm of the external force on the first stop is smaller than the lever arm on the second stop. This results in the torque on the first stop being smaller than the torque on the second stop. When the torque on the first stop is small enough, even if the same screwing force is applied, the cap can only rotate in the direction of the second stop and cannot rotate in the opposite direction.

[0100] In this application, the unidirectional motion constraint effect of the stop is achieved by adjusting the external torque of the stop. The stop forms a new fixed point, with a larger torque for a longer lever arm and a smaller torque for a shorter lever arm. The stop allows the cap to rotate in the direction of the longer lever arm and prevents rotation in the direction of the shorter lever arm. Generally, the lever arm of the stop adjacent to the rocker arm tooth should be as short as possible so that the torque is small enough to better prevent the cap from rotating in that direction.

[0101] Based on the above, a stop can be set on the second side of the swing arm. However, the purpose of setting the stop on the second side is not to prevent the swing arm from swinging to the second side, but only to adjust the torque. Therefore, the stop on the second side cannot prevent the swing arm from swinging to the second side, but the stop on the first side can prevent the swing arm from swinging to the first side.

[0102] Preferably, the rocker arm teeth and the rocker arm beam are made of the same material.

[0103] Preferably, the one or more swing arms and the annular base are integrally formed. The one or more swing arms and the annular base constitute a swing arm ring.

[0104] Preferably, one or more swing arms extend radially outward along the circumference of the annular base.

[0105] Preferably, the annular base is fixed to the housing in a detachable or non-detachable manner.

[0106] Preferably, the annular base is detachably and fixedly mounted on the housing via a snap-fit ​​structure.

[0107] Preferably, the buckle structure is spaced apart from the swing arm and disposed at the periphery of the annular base.

[0108] Preferably, one end face of the housing is provided with an annular platform, and the tail ends of the one or more swing arms are fixed to the annular platform. The annular platform is used to support the one or more swing arms.

[0109] Preferably, the annular base is fixedly disposed on the annular platform.

[0110] Preferably, the annular base is fixedly disposed on the inner periphery of the annular platform by a snap-fit ​​structure; the one or more swing arms are supported on the end face of the annular platform.

[0111] Preferably, the one or more blocks are fixedly mounted on the annular platform of the housing.

[0112] Preferably, the one or more stops are evenly spaced on the outer periphery of the annular platform.

[0113] Preferably, the stop block is integrally formed with the annular platform.

[0114] Preferably, the tip of the rocker arm tooth protrudes from the outer periphery of the annular platform. The protruding tooth tip is designed to fit into the groove of the screw cap, thereby achieving engagement between the rocker arm tooth and the groove.

[0115] Preferably, the leading edge of the one or more stops is substantially flush with the outer periphery of the annular platform. "Substantially flush" means that the distance between the leading edge of the stop and the outer periphery of the annular platform is within ±1 mm.

[0116] Preferably, the screw cap has a cavity with a snap-fit ​​feature, and the cavity may at least be provided with the circumferential groove or segmented groove.

[0117] In a preferred embodiment, the inner wall of the cavity of the screw cap is provided with a circumferential groove. Correspondingly, the housing is provided with a swing arm ring, the swing arm ring including a centrally located annular base, and one or more swing arms extending from the outer periphery of the annular base. The swing arms include swing arm teeth and swing arm beams, and the swing arm teeth can engage or disengage with the groove on the screw cap.

[0118] Preferably, the groove and the rocker arm achieve axial engagement and disengagement through a shifting structure. Engagement or disengagement of the groove and rocker arm teeth via the swinging of the rocker arm is radial engagement and disengagement; while the shifting structure achieves axial engagement and disengagement of the groove and rocker arm. Axial engagement is the basis for radial engagement and disengagement. Axial engagement means that the groove and rocker arm lie on the same plane. In this application, when the groove and rocker arm are axially engaged, the circumference of the annular base and the circumference of the groove are concentric circles.

[0119] The gear mechanism can provide at least two gear positions. For example, pressing down on the cap creates the first gear position, where the groove engages with the swing arm teeth; pulling up the cap creates the second gear position, where the groove axially separates from the swing arm teeth.

[0120] Specifically, when the cap is pressed down, the cap engages with the winding reel, and the groove of the cap engages with the swing arm teeth of the housing. At this time, the belt system is in the first gear position. When the cap is turned in the tightening direction, the belt will wrap around the winding reel in the tightening direction. In this gear position, due to the constraint of the stop block, the swing arm teeth can only move in one direction, and the cap cannot rotate in the opposite direction, thus achieving the function of tightening the belt and preventing it from loosening.

[0121] When the cap is pulled up, the cap disengages from the winding reel, the swing arm disengages from the groove, and the swing arm is no longer constrained by the stop. At this time, both the cap and the winding reel can rotate freely clockwise or counterclockwise, thereby achieving automatic unwinding of the cable.

[0122] Preferably, both the tip of the rocker arm tooth and the upper surface of the groove are provided with a chamfered surface. When the cap is pressed down, the chamfered surface has a sliding guiding function, which facilitates the smooth engagement of the rocker arm tooth with the groove.

[0123] Preferred embodiments of the gear shifting structure, the winding wheel structure, and the connection method between the winding wheel and the cap not mentioned in this application can be found in the content of patent document CN208993976U, all of which are incorporated herein by reference. In this application, the cap is equivalent to the top cover in patent CN208993976U, and the winding wheel is equivalent to the winding groove in patent CN208993976U.

[0124] However, the gear shifting structure in this application is not limited to the gear shifting structure disclosed in patent document CN208993976U. Other structures that can realize the gear shifting function are also applicable to the belt device of this application.

[0125] Preferably, the housing is directly fixed to the object to be secured. The object to be secured includes shoes, clothing, hats, and bags, etc.

[0126] Preferably, the tying device further includes a base, the housing is fixed on the base, and the base is fixed to the object to be fastened.

[0127] Preferably, the winding reel can be integrally formed with the screw cap, or fixedly connected to or detachably connected to the screw cap. When the winding reel is connected to the screw cap, the rotation of the screw cap will drive the winding reel to rotate.

[0128] This invention discloses a strapping device based on a swing arm-groove-stop structure, wherein the swing arm and stop are located on the housing, and the groove is located on the cap. The cap can rotate relative to the housing, that is, the groove can rotate relative to the swing arm; however, the swing arm can also rotate relative to the groove. In this case, it is only necessary to set the swing arm and stop on the cap and set the groove on the housing to achieve the strapping function.

[0129] The present invention also provides a lacing device based on a swing arm structure, the lacing device comprising: a cap, a winding reel, and a housing, wherein the cap is rotatably mounted on the housing, and the winding reel is supported by the housing and can rotate relative to the housing; wherein,

[0130] The housing is provided with one or more grooves;

[0131] The reel is configured to wind up the tether when rotating in the tension direction and release the tether when rotating in the unwind direction;

[0132] The screw cap is provided with one or more swing arms; the swing arm includes at least a swing arm tooth and a swing arm beam, the swing arm includes a first side and a second side opposite to each other; the swing arm tooth is configured to engage the housing groove when the swing arm is in its original position, and the swing arm beam and / or the swing arm tooth is configured to swing from its original position toward the first side of the swing arm, or from its original position toward the second side of the swing arm.

[0133] The cap is further provided with one or more stops, and at least the first side of the swing arm is adjacent to the stops; when the cap is subjected to an external force in the tensioning direction, the stops allow the swing arm beam and / or swing arm teeth to swing from their original position to the second side of the swing arm, so as to allow the cap to rotate in the tensioning direction;

[0134] When the cap is subjected to an external force in the opening direction, the stop is configured to prevent the swing arm beam and / or swing arm teeth from swinging toward the first side of the swing arm, thereby preventing the cap from rotating in the opening direction.

[0135] When the swing arm teeth engage the housing groove, the swing arm is in its original position and is in a naturally extended state. When the cap is subjected to external force, the swing arm beam and / or swing arm teeth swing from the original position to the first side or from the original position to the second side, and the swing arm beam and / or swing arm teeth are in a state of flexural deformation.

[0136] In the embodiment of swing arm rotation, the direction of the first side of the swing arm is the tensioning direction of the belt device; the direction of the second side opposite the first side of the swing arm is the anti-reverse direction of the belt device. The swing arm-groove-stop structure provided in this application is an anti-reverse structure. When the swing arm teeth engage with the groove, the belt device is only allowed to rotate in the tensioning direction and cannot rotate in the loosening direction.

[0137] When the swing arm rotates, the swing arm acts as the driving component. The groove in the swing arm acts as a barrier to the movement of the swing arm teeth. Therefore, when the cap is screwed in the tightening direction, the swing arm teeth are resisted by the groove in the housing, causing the swing arm beam to swing to the second side of the swing arm to make way. The cap and the winding drum can rotate in the tightening direction. However, when the cap is screwed in the loosening direction, although the resistance applied to the swing arm teeth by the sidewall of the groove makes the swing arm teeth tend to swing to the first side, the stop block set on the first side of the swing arm prevents the swing arm beam from swinging to the first side to make way. Therefore, the swing arm teeth and the groove in the housing always remain engaged, and the cap cannot rotate in the loosening direction, thereby achieving the function of preventing reverse rotation.

[0138] When the cap is subjected to an external force in the tensioning direction, the stop allows the swing arm beam and / or swing arm teeth to swing from their original position to the second side of the swing arm. At this time, the swing arm teeth slide along the side wall of the housing groove to allow the cap to rotate in the tensioning direction.

[0139] When the cap is subjected to an external force in the opening direction, the stop is configured to prevent the swing arm beam and / or swing arm teeth from swinging toward the first side of the swing arm, so that the swing arm teeth remain engaged with the housing groove to prevent the cap from rotating in the opening direction.

[0140] Preferably, when the cap is subjected to an external force in the tensioning direction, the stop allows the rocker arm beam and / or rocker arm teeth to reciprocate from their original position to the second side of the rocker arm, thereby allowing the cap to rotate in the tensioning direction. The present invention also provides a rocker arm-groove-stop structure for a fastening device, comprising:

[0141] One or more grooves provided along the circumference;

[0142] One or more swing arms are arranged along a circumference, each swing arm including at least a swing arm tooth and a swing arm beam; the swing arm includes a first side and a second side opposite to each other; the swing arm tooth is configured to engage the groove when the swing arm is in its original position, and the swing arm beam and / or the swing arm tooth is configured to swing from its original position toward the first side of the swing arm, or from its original position toward the second side of the swing arm.

[0143] One or more stops are provided, and at least one stop is provided adjacent to the first side of the swing arm, the stop and the swing arm are separately disposed; when the groove is subjected to a tension force, the stop is configured to allow the swing arm beam and / or swing arm teeth to swing from their original position to the second side of the swing arm, so as to allow the groove to move in the tension direction;

[0144] When the groove is subjected to a loosening force, the stop is configured to prevent the rocker arm beam and / or rocker arm teeth from swinging from their original position toward the first side of the rocker arm, thereby preventing the groove from moving in the loosening direction.

[0145] The direction of the first side of the swing arm is the anti-reverse direction of the structure, which is the loosening direction of the strap device; the direction of the second side of the swing arm is the tightening direction of the strap device.

[0146] When the groove is subjected to tension, the stop allows the rocker arm beam and / or rocker arm teeth to swing from their original position to the second side of the rocker arm. At this time, the rocker arm teeth slide along the side wall of the groove in the housing to allow the cap to move in the tensioning direction.

[0147] When the groove is subjected to a loosening force, the stop is configured to prevent the rocker arm beam and / or rocker arm teeth from swinging toward the first side of the rocker arm, so that the rocker arm teeth remain engaged with the housing groove to prevent the groove from moving in the loosening direction.

[0148] Preferably, when the groove is subjected to tension, the stop allows the rocker arm beam and / or rocker arm teeth to reciprocate from their original position to the second side of the rocker arm, thereby allowing the groove to rotate in the tension direction.

[0149] Preferably, when the groove is subjected to a tension force, the groove is configured such that its sidewalls bias the rocker arm teeth, thereby forcing the rocker arm beam to deviate from its original position and swing to a second side, causing each rocker arm tooth to disengage from each groove, allowing the groove to move along the tension direction. Preferably, the groove is formed by adjacent protrusions arranged circumferentially.

[0150] Preferably, the opening end of the groove extends protruding inwards into the circumference; the rocker arm tooth extends outwards radially along the circumference.

[0151] Preferably, the opening end of the groove protrudes inward along the circumferential radial direction; the rocker arm tooth extends outward along the circumferential radial direction.

[0152] Preferably, the rocker arm tooth includes a tooth tip for engaging the groove.

[0153] Preferably, the tooth tip matches the shape of the groove so that the tooth tip can be embedded in the groove to achieve engagement between the rocker arm tooth and the groove.

[0154] Preferably, the swing arm beam extends radially along the circumference of the swing arm.

[0155] Preferably, the stop block and the swing arm are separately configured.

[0156] Preferably, the stop block and the swing arm are configured in a one-to-one correspondence.

[0157] Preferably, the minimum distance between the leading edge of the stop and the end point of the groove opening is less than the average width of the cross section of the swing arm.

[0158] More preferably, the minimum distance between the front edge of the stop block and the end point of the groove opening is less than the width of the cross section of the swing arm corresponding to the rear edge position of the stop block.

[0159] Preferably, the stop includes a first stop and a second stop, with the first stop adjacent to the first side of the one or more swing arms, and the second stop adjacent to the second side of at least one swing arm.

[0160] Preferably, the swing arm includes a swing arm tail portion, the first stop block is disposed adjacent to a first side of the swing arm beam near the swing arm teeth, and the second stop block is disposed adjacent to a second side of the swing arm beam near the swing arm tail portion.

[0161] The lever arm corresponding to the fixed point formed by the first stop is much smaller than the lever arm corresponding to the fixed point formed by the second stop, so the first stop can prevent the cap from moving in the direction of the first stop.

[0162] More preferably, the stop is disposed on the first side of the swing arm beam, and the stop spans 1 / 2 to 1 / 2 of the length of the swing arm beam. In this case, the contact area between the stop and the swing arm beam is relatively large, so as to offset the external force exerted on the swing arm beam by the groove sidewall to the greatest extent, and to more reliably and stably prevent the swing arm from swinging to the first side.

[0163] Preferably, the rocker arm beam and the rocker arm gear are integrally formed.

[0164] Preferably, the one or more swing arms are fixedly mounted on an annular base.

[0165] Preferably, the one or more swing arms extend radially outward along the circumference of the annular base.

[0166] Preferably, the base is a stretchable annular base.

[0167] Preferably, the retractable annular base includes a retractable portion and a fixing portion, wherein the retractable portion has a wavy or spiral structure. The fixing portion is used to fix the retractable annular base to the housing.

[0168] Preferably, the head of each swing arm beam is adjacent to the swing arm tooth, and the tail of the swing arm beam is adjacent to the telescopic part.

[0169] Preferably, the retractable part includes at least one retractable segment.

[0170] More preferably, the retractable portion includes two or more retractable segments.

[0171] Preferably, each of the retractable segments is a wave-shaped structure or a spiral structure.

[0172] Preferably, the propagation direction of the expandable section of the wave-shaped structure extends along the circumference of the annular base. A sine curve in the wave-shaped structure constitutes one cycle, and the direction in which the cycle repeats is the propagation direction.

[0173] Preferably, the tail end of the swing arm beam is connected to at least one telescopic section, which extends toward a first side and / or a second side of the swing arm beam.

[0174] Preferably, the tail portion of the swing arm beam is connected to two telescopic sections, which extend toward the first and second sides of the swing arm beam, respectively.

[0175] Preferably, the connection between the tail of the swing arm beam and the two telescopic sections is in the shape of a three-pronged fork or an inverted Y.

[0176] Preferably, the one or more swing arms and the annular base are integrally formed.

[0177] Preferably, the one or more swing arms and the annular base constitute a swing arm ring.

[0178] Preferably, the number of swing arms is the same as the number of fixed parts, and each swing arm is evenly spaced from each fixed part.

[0179] The beneficial effects of this invention include the following aspects:

[0180] 1. A novel swing arm-groove-stop structure is provided, which is applied to the belt fastening device, enriching the types of belt fastening devices and increasing the diversity of user choices;

[0181] 2. By setting the stop, the cap can only rotate in the tensioning direction when it is in the first position, which enhances the anti-reverse performance of the strap device and prevents the strap from accidentally coming loose.

[0182] 3. By using the principle of adjusting the length of the lever arm with a stop block, the torque applied to the swing arm tooth is adjusted to prevent the cap from rotating in the direction of the shorter lever arm, thus achieving the anti-reverse performance of the belt device.

[0183] 4. The swing arm-groove-stop structure uses bending force to make the swing arm swing and move. The stop structure not only prevents the tie device from reversing, but also improves the efficiency of stress dissipation inside the swing arm. Compared with the pawl-ratchet structure that uses the material's buckling resistance to prevent reversal, the swing arm structure has stronger fatigue resistance and excellent reliability and durability.

[0184] 5. The retractable annular base can greatly increase the swing elasticity and clearance of the swing arm teeth, making it easier to rotate the screw cap in the tightening direction, thus improving the user's feel and user experience. Attached Figure Description

[0185] Figure 1 This is a schematic diagram of a ratchet structure that uses a ratchet-ratchet anti-reverse mechanism in the prior art;

[0186] Figure 2 A schematic diagram of another ratchet structure using the ratchet-ratchet anti-reverse mechanism in the prior art;

[0187] Figure 3 An exploded view of an embodiment of the tethering device based on a swing arm structure of the present invention;

[0188] Figure 4 yes Figure 1 Reverse perspective view of the center-turn cap;

[0189] Figure 5 yes Figure 4 The diagram shows the orthographic projection view and sectional view of the screw cap; in which Figure 5 a is the orthographic projection view of the screw cap. Figure 5 b is a cross-sectional view of the screw cap along the AA direction. Figure 5 c is a magnified view of a portion of region A;

[0190] Figure 6 yes Figure 1 A schematic diagram and orthographic projection view of the middle swing arm ring; wherein, Figure 6 a is a 3D view of the swing arm ring. Figure 6 b is the orthographic projection view of the swing arm ring;

[0191] Figure 7 yes Figure 1 The above-ground projection view of the housing in the lacing device shown;

[0192] Figure 8 yes Figure 1 The diagram shows the combined structure of the housing and the swing arm ring in the lacing device. Figure 8 a is a three-dimensional diagram of the composite structure. Figure 8 b is the orthographic projection view of the composite structure;

[0193] Figure 9 yes Figure 1 The top view shown illustrates the movement of multiple swing arms to make room when the cap is screwed on in the tightening direction. Figure 9 a and local magnification Figure 9 b;

[0194] Figure 10 This is a schematic diagram analyzing the torque of multiple swing arms when screwing the cap in the tightening and loosening directions;

[0195] Figure 11 yes Figure 10 A magnified view of a portion of region B in the middle;

[0196] Figure 12 This is a schematic diagram of another embodiment of the stop block arrangement in the belt fastening device;

[0197] Figure 13 This is a schematic diagram of another embodiment of the groove in the lacing device;

[0198] Figure 14 This is a schematic diagram of the swing arm ring in another embodiment of the lacing device;

[0199] Figure 15 This is a schematic diagram of the orthographic projection of the combined structure of the cap, housing, and swing arm ring in another embodiment of the lacing device;

[0200] Figure 16 This is a top view of the process of the swing arm moving to make way when an external force is applied in the tensioning direction in another embodiment of the tethering device. Figure 16 Local magnification at points a and A1 Figure 16 b (position where the rocker arm tooth engages with the groove);

[0201] Figure 17 Top view of the process of the swing arm moving to make way when an external force is applied in the tensioning direction in another embodiment of the lacing device. Figure 17 Local magnification at points a and A2 Figure 17 b (position during the middle stage of the swing arm yielding);

[0202] Figure 18 Top view of the process of the swing arm moving to make way when an external force is applied in the tensioning direction in another embodiment of the lacing device. Figure 18 Magnified views of points a and A3 Figure 18 b (swing arm yielding critical position);

[0203] Figure 19 Top view of different positions where the swing arm moves to make way when an external force is applied in the tensioning direction in another embodiment of the lacing device. Figure 19 Magnified views of points a and A4 Figure 19 b (the state where the rocker arm tooth and the groove re-engage);

[0204] Figure 20 yes Figure 14The illustrated embodiment shows top views of different positions of the swing arm moving in the opposite direction to make way after the stop block is removed, and enlarged views of positions B1 and B2 (where B1 is the position where the swing arm tooth engages with the groove and B2 is the position during the intermediate process of the swing arm making way).

[0205] Figure 21 yes Figure 14 The force analysis diagram of the swing arm moving to make way when an external force is applied in the tensioning direction in the embodiment shown;

[0206] Figure 22 yes Figure 14 The force analysis diagram of the swing arm moving in the opposite direction to make room when an external force is applied in the loosening direction after the stop block is removed in the embodiment shown;

[0207] Figure 23 This is a top view of the process of the swing arm moving to make way when an external force is applied in the tensioning direction in another embodiment of the lacing device. Figure 23 Local magnification at points a and C2 Figure 23 b (position during the middle stage of the swing arm yielding);

[0208] Figure 24 This is a top view of another embodiment of the lacing device when an external force is applied in the release direction. Figure 24 Local magnification at points a and C1 Figure 24 b (the position where the rocker arm tooth engages with the groove). Detailed Implementation

[0209] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein the same or similar reference numerals denote the same or similar parts or parts having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0210] It should be understood that the terms "upper", "lower", "left", "right", "front", "back", "length", "width", "horizontal", "vertical", "top", "bottom", "inner", and "outer" used in the description of this invention are based on the orientation or positional relationship shown in the accompanying drawings and are intended to facilitate the description of this invention and simplify the description. They should not be construed as a limitation that the device or component referred to must have a specific orientation or positional relationship.

[0211] Furthermore, the terms "first" and "second" are used solely for distinguishing purposes and do not imply relative importance, nor do they indicate or suggest the number of technical features. Therefore, a feature defined by "first" or "second" may explicitly or implicitly indicate that there is one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise expressly defined.

[0212] Unless otherwise explicitly specified, the terms "connection" and "fixation" in this invention should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integrally formed connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0213] Existing technology description

[0214] like Figure 1 The diagram shows a pawl in a commonly used ratchet-ratwheel anti-reverse structure. The housing teeth (ratchet) are stationary, while the pawl moves, a common configuration. In this structure, the pawl tooth C with the elastic pawl arm Ar can only rotate along the ratchet teeth in direction A and cannot rotate in the opposite direction. This is because when the pawl tooth C rotates along direction A, when a rotational force Q1 is applied along direction A through the screw cap, the pawl tooth C experiences a lateral pressure F1 from the ratchet teeth. This lateral pressure F1 forces the portion of the pawl arm Ar containing the pawl tooth C to undergo radial inward bending deformation, thus displacing the pawl tooth C by bias. However, when a rotational force Q2 is applied along direction B through the screw cap, the pawl tooth C experiences an axial pressure F2 from the ratchet teeth, approximately parallel to the extension direction of the elastic pawl arm, and a static friction force F3 at the contact surface. This static friction force F3 extends radially outward along the tangent of the contact surface. At this point, the pawl tooth C can only remain firmly attached to the surface of the ratchet teeth, preventing the pawl from rotating in the opposite direction. Furthermore, under the combined action of axial pressure F2 and rotational force Q2, the elastic pawl arm Ar is prone to radially outward buckling deformation as shown by the arrow in the figure. Since this buckling deformation is irreversible, it constitutes destructive structural instability. This structure allows the housing teeth to abut against the pawl arm Ar, so that when the pawl arm Ar attempts to deflect or bend radially outward, it rests against the tips of the housing teeth, distributing the force radially to the housing teeth and preventing buckling. The pawl teeth with elastic pawl arms prevent reversal because the pawl arms are difficult to buckle. Figure 1The structure shown can prevent buckling deformation through a mechanism similar to the buckling restraint support principle. The rotatable direction is applicable to the bending deformation mechanism of cantilever beams. Since the bending deformation deflection is related to the bending stiffness of the material and the magnitude of the external force, when the elastic pawl arm has high elasticity, only a small force is needed to cause a small amount of bending deformation. Since the hysteresis curve of the biased bending shear member is very full and has excellent energy dissipation performance, repeated biasing has little adverse effect on the pawl rotating in the A direction. However, when rotating along direction B, the pawl arm is forced to yield by axial compressive force. Although the housing teeth abut against the pawl arm to prevent buckling, both pressure F2 and rotational force Q2 are transmitted along the axial direction of the pawl arm Ar. Since the pawl arm Ar often adopts a slender structure to maintain good elasticity, the transmission paths of pressure F2 and rotational force Q2 are relatively long. Although their directions are opposite, they are difficult to cancel each other out quickly, resulting in buckling deformation as shown in the figure. While the presence of the housing teeth can prevent excessive buckling, it cannot avoid local stress concentration in the pawl arm, which can easily lead to fatigue failure. Furthermore, the housing teeth and pawl arm are in point contact, resulting in low energy efficiency, and the pointed contact is prone to wear. Therefore, when the fastening mechanism is subjected to a large reverse external force, the pawl arm is easily damaged unexpectedly.

[0215] Another type of ratchet-ratchet check mechanism exists in the prior art, such as... Figure 2 As shown, the pawl structure is a cantilever Ca structure, where each cantilever Ca includes a free end Ca1 and a supporting base Ca2. Each pawl Ca is positioned substantially perpendicular to a specific radial line passing through the center of the spool member. This radial line extends from the center point of the spool member and intersects each base Ca2. (Reference) Figure 2 Each pawl 62 can be positioned such that its central axis OL1 forms an angle of approximately 90° with respect to a radial line OL2, wherein the radial line OL2 extends from the approximate center of the spool assembly and intersects the base Ca2 of the pawl. When the cap is screwed counterclockwise in the illustrated direction, the end Ca1 of each pawl abuts against the first sidewall Dr1 of the groove, which prevents the spool assembly from rotating in the illustrated direction. Figure 2 As shown, the first sidewall Dr1 of the groove is basically perpendicular to the central axis OL1 of the long axis of the pawl Ca. Therefore, when a rotational force is applied in the counterclockwise direction, the force Q3 applied to the pawl is basically along the long axis OL1 of the pawl. Under the action of this external force, the pawl abuts against the first sidewall Dr1. The reverse pressure F4 applied to the pawl by the first sidewall Dr1 of the groove is also along the long axis OL1. Under the combined action of the reverse pressure F4 and the twisting force Q3, the cantilever Ca is prone to buckling deformation. For details of the deformation mechanism, see [link to relevant documentation]. Figure 1The existing technology is described in the section on the prior art, but the difference is that this structure does not have a structure to prevent excessive buckling of the cantilever. Therefore, under an external force exceeding the yield strength, the cantilever Ca will buckle and fail.

[0216] Figure 1 and Figure 2 The existing structures shown have the following similarities: (1) The long axis of the pawl arm extends basically along the radial line perpendicular to the spool member; (2) The unidirectional rotation of the structure is achieved by utilizing the anti-buckling deformation of the material, that is, the loosening force and the reverse pressure transmitted by the groove are both along the long axis. As long as the pawl arm does not buckle, the spool cannot rotate along the direction of the loosening force, thereby achieving unidirectional anti-reverse rotation; (3) The unidirectional rotation along the tensioning direction is achieved by utilizing the bending deformation of the cantilever.

[0217] For structures with good elasticity, the external force required for bending deformation is not large, especially since a small bending moment can lead to slight bending deformation. Therefore, bending deformation in the tension direction has little impact on the service life of the pawl arm. However, when subjected to a release force, the pawl arm mainly relies on its yield strength to prevent reverse rotation. Even if the release force is always less than the yield strength, the external force along the long axis can easily cause stress concentration inside the pawl arm, leading to fatigue damage and thus adversely affecting the service life of the pawl structure. To solve the above problems, the swing arm structure provided in this application uses the bending force of the swing arm for both tension and release forces. The swing arm extends radially along the spool component, and the free end of the swing arm can bend and deform in both clockwise and counterclockwise directions to swing and make way. Therefore, the swing arm structure alone can enable the spool component to rotate in both directions and cannot achieve unidirectional reverse rotation prevention. However, to ensure the fastening mechanism prevents accidental loosening of the strap, this application cleverly incorporates a stop structure. This prevents the free end of the swing arm from bending towards the side where the stop is located; that is, the swing arm cannot swing to the side where the stop is located. Therefore, the swing arm-stop structure enables unidirectional anti-reverse rotation of the spool component. Since the external forces acting on the swing arm structure during bidirectional rotation are bending forces, bending deformation and swinging have minimal damage to the swing arm structure. The focus here is on the stress in the anti-reverse direction. Because the bending force is transmitted along the short axis of the swing arm, the force transmission is short-range. Therefore, the biased pressure applied by the groove sidewall and the reverse resistance provided by the stop can cancel each other out to some extent. Furthermore, the stop and the swing arm are in surface contact, resulting in high stress dissipation efficiency. Therefore, the loosening force is less likely to cause stress concentration inside the swing arm, and compared to stress concentration along the long axis, fatigue damage is less likely to occur, thus greatly improving the reliability and durability of the fastening mechanism.

[0218] The novel one-way anti-reverse structure of the swing arm-stop block-groove in this invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0219] Example 1

[0220] like Figure 3 As shown, a lacing device based on a swing arm structure includes a base 1, an elastic stop pin 2, a winding wheel 3, a housing 4, a swing arm ring 5, and a screw cap 6. The base 1 can be fixedly mounted on the upper, tongue, heel, clothing, hat, or bag. The top end face of the housing 4 is fixedly connected to the swing arm ring 5 through a snap-fit ​​structure 42. The structure of the elastic stop pin 2 and the winding wheel 3, as well as the connection method between the winding wheel 3 and the screw cap 6, can be found in the patent document CN208993976U.

[0221] like Figure 4 and 5 As shown, the inner wall of the cavity of the screw cap 6 has a circumferential groove 62, and an inner groove 621 is provided on the inner circumference of the circumferential groove. The orthographic projection OP of the groove 621 is the two sides of a rounded isosceles triangle, and a beveled surface 621S is provided on the top of the side wall of the groove 621. Correspondingly, as Figure 6 As shown, the swing arm ring 5 includes a centrally located annular base 51, with one or more swing arms 52 extending outward from the outer periphery of the annular base 51. In this embodiment, three swing arms are provided, which are equally spaced and extend radially along the circumference of the annular base. The swing arms 52 are frustum-shaped pyramids, with the cross-sectional area decreasing from the swing arm beam 522 to the swing arm tooth 521, and a length-to-diameter ratio of 4.5. Each swing arm includes a swing arm tooth 521 and a swing arm beam 522. As shown, the swing arm tooth 521 includes a tooth tip 5211, the shape of which is consistent with the shape of the groove 621, also being a rounded isosceles triangle with two sides, allowing it to engage or disengage with the groove 621 on the screw cap 6. The top of the swing arm tooth 521 also has a chamfered surface 521S. The chamfered surface of the swing arm tooth and the chamfered surface of the groove sidewall cooperate to provide a sliding guide function, facilitating smooth engagement between the swing arm and the groove.

[0222] like Figure 7 The image shown is a frontal projection view of the housing in this embodiment; Figure 8 This is a schematic diagram of the combined structure of the housing and the swing arm ring. (Example) Figure 3 , 7 As shown in Figure 8, the housing 4 includes an annular platform 43. One or more stops 44 are integrally formed on the outer periphery of the annular platform 43. The stops 44 are arranged one-to-one with the swing arms 52 and are adjacent to the same side (clockwise side or counterclockwise side, in this embodiment it is the counterclockwise side (also called the first side)) of the swing arm teeth 521. The stops 44 are used to prevent the swing arm teeth 521 from swinging in the counterclockwise direction (first side direction), thereby preventing the cap from rotating in the counterclockwise direction. The clockwise direction of the lacing device using the stop-swing arm ring structure is the direction of tightening the lacing. Therefore, the setting of the stops 44 can prevent the cap and the winding wheel from rotating in the counterclockwise direction under the action of the loosening force, thereby avoiding accidental disengagement of the lacing in the tightened state.

[0223] like Figure 3 and 4 As shown, the inner wall of the cavity of the cap 6 has at least one latch 63, and the housing 4 is correspondingly provided with a latch protrusion 41. The cap 6 is pressed against the outer periphery of the housing to form an integral locking structure of the strap device. A grip 64 is provided on the periphery of the cap 6; the grip 64 facilitates the user to rotate or move the cap, thereby realizing the adjustment of the gear position and the tightening and loosening of the strap through the grip.

[0224] During assembly, after the cable is threaded through, the elastic stop pin 2 is fixed to the base 1, the winding wheel 3 passes through the elastic stop pin 2 and is set inside the housing 4. The top end face of the housing 4 is fastened to the swing arm ring 5 and then fixed to the base 1. After the screw cap 6 is fixed with the interlocking teeth 61, it is pressed onto the housing 4. The screw cap 6 is detachably connected to the winding wheel 3 through the interlocking teeth 61, and the cable tying device is then assembled.

[0225] When using this lacing device, press the cap 6 firmly until you hear a "click," indicating that the teeth 61 on the cap 6 are engaged with the teeth 31 on the reel 3. Rotating the cap 6 at this point will cause the reel 3 to rotate as well. Turning the cap 6 in the tightening direction will produce a crisp "click-click" sound. At this point, the swing arm tooth 521 engages with the groove 621, and the teeth 61 and 31 are engaged. The cap 6 drives the reel 3 to rotate in the tightening direction, and the lacing strap winds around the winding groove 32 of the reel 3, gradually tightening the item until it feels comfortable. If it feels too tight, pull up the cap 6, disengaging the teeth 61 and 31. The taut lacing strap will then cause the reel to rotate in the opposite direction, loosening the item. Press the cap 6 again and repeat the tightening action to adjust the tightness of the item to a comfortable level.

[0226] Figure 9 This is a top view showing the movement of multiple swing arms to make way when the strap device of this embodiment is screwed on in the tensioning direction. Figure 9As shown, when the swing arm 52 is in its original position, the swing arm beam 522 naturally extends radially R along the circumference. At this time, the swing arm tooth 521 engages with the groove 621 in the first position P1. When the cap is screwed in the direction shown in the figure, the sidewall of the groove 621 presses the sidewall of the swing arm tooth 521 clockwise, and the swing arm beam 522 shifts to the second side as a whole. The swing arm tooth 521 moves from the first position P1 to the second position P2 to make way for the groove 621, so that the opening end point 621T of the groove 621 can pass the top 5211T of the tooth tip 5211. Once the opening end point 621T of the groove passes the top 5211T of the tooth tip, the swing arm tooth 521 swings back counterclockwise to the first position P1 to re-engage with the groove 621, thereby causing the groove 621 to advance one step in the clockwise direction. By repeating the previous tightening action, the cap and the winding wheel can be rotated one circle at a time. When the cap is turned counterclockwise, the stop 44 prevents the swing arm tooth 521 from swinging counterclockwise (towards the first side), thus preventing the cap and winding wheel from rotating counterclockwise and avoiding accidental loosening of the strap under the action of loosening force. Figure 10 As shown, when the cap is turned clockwise, the external force is transmitted to the swing arm teeth through the sidewall of the groove. At this time, the lever arm of the external force on the fixed end point G1 of the swing arm is L1. When the cap is turned counterclockwise, the fixed point closest to the swing arm is transferred to G2, and the lever arm length is L2. Since L1 is much larger than L2, under the same external force, according to the torque M = external force F * lever arm L, the torque M2 generated by the external force when the swing arm swings counterclockwise (towards the first side) is much smaller than the torque M1 generated by the external force when swinging clockwise (towards the second side). Therefore, when the cap is turned clockwise with the same external force, the cap can rotate. However, when the cap is turned counterclockwise, the rotational torque on the swing arm is very small and cannot swing to make way, so the cap cannot rotate counterclockwise, thus preventing the strap from accidentally coming loose under the action of the loosening force.

[0227] Figure 11 yes Figure 10 The enlarged view of region B shows that D1 is the width of the cross-section of the swing arm corresponding to the rear edge Eb position of the stop 44, and D2 is the minimum distance from the front edge Ef of the stop 44 to the end point of the opening of the groove 621. When D2 < D1, the stop 44 can better prevent the swing arm from swinging towards the side where the stop 44 is located, thereby preventing the cap and the winding wheel from rotating in the opposite direction.

[0228] In other preferred embodiments, such as Figure 12 As shown, each swing arm has a first stop 441 and a second stop 442 on both sides, wherein the position and manner of the first stop 441 are the same as those of the second stop. Figure 3-9The middle stop 44 is set in the same way and in the same position, while the second stop 442 is set on the second side adjacent to the fixed end (tail end) of the swing arm. The second stop 442 is also integrally formed on the annular platform. In this preferred embodiment, when the cap is screwed clockwise, the external force is transmitted to the swing arm teeth through the groove sidewall. At this time, the lever arm of the external force on the second stop 442 of the swing arm is L1'. When the cap is screwed counterclockwise, the lever arm length on the first stop 441 is still L2, and L1' is often much larger than L2. Therefore, under the same external force, as long as the lever arm L2 is small enough, the torque M2 generated by the external force when the swing arm swings counterclockwise (towards the first side) is small enough. So when the cap is screwed clockwise with a basically the same external force, the cap can rotate. However, when the cap is screwed counterclockwise, because the rotational torque on the swing arm is very small, it cannot swing to make way, causing the cap to not rotate counterclockwise, thereby preventing the strap from accidentally loosening under the action of the loosening force. Of course, in other embodiments, the first stop and the second stop can be provided on the first and second sides of one or two of the swing arms, respectively.

[0229] In other preferred embodiments, the grooves may not be circumferential grooves arranged along 360°, but may be three grooved structures 621' and three non-grooved structures 622' spaced apart along the circumference, wherein each segment is of equal length, such as... Figure 13 As shown. In other preferred embodiments, the number of swing arms may also be 1, 2, 4...

[0230] In other preferred embodiments, the counterclockwise direction can be set as the direction of tightening the strap, and the clockwise direction can be set as the direction of loosening the strap. In this case, the stop block should prevent the swing arm from swinging in the clockwise direction. Therefore, the setting position of the stop block should be set reasonably according to the actual situation.

[0231] Example 2

[0232] The tying device structure provided in this embodiment is basically the same as that in embodiment 1. The main difference is that the annular base of the swing arm ring is a retractable annular base, and the inclination of the swing arm teeth and the two side walls of the groove are different.

[0233] like Figure 14As shown, the swing arm ring 5' includes a retractable annular base 51' and three swing arms 52'. The tails of the three swing arms 52' are located on a circumference, and each swing arm beam 522' and swing arm tooth 521' extends radially outward along the circumference. The retractable annular base 51' includes a retractable portion 511' and three fixing portions 512', forming a closed ring. The three swing arms 52' and three fixing portions 512' are evenly spaced on the circumference of the base. The fixing portions 512' are provided with a snap-fit ​​structure 5121' for fixing the retractable annular base 51' to the housing. The retractable portion 511' includes six relatively independently arranged retractable segments 5111' and three independently arranged fixing portions 5121'. The six retractable segments 5111' have a wavy structure. In other preferred embodiments, the retractable segments can also be a spiral structure.

[0234] The swing arm teeth and swing arm beams of each swing arm extend radially outward. The head of each swing arm beam is adjacent to the swing arm teeth, and the tail is connected to two telescopic sections 5111' respectively. The connection point X is inverted Y shape, that is, the two telescopic sections 5111' extend to the first side LC and the second side RC of the swing arm beam respectively.

[0235] The crests of each wavy, retractable section are located on the same crest circumference; the troughs are located on the same trough circumference; and the crest and trough circumferences are concentric circles. The fixing part 512' is fixedly connected to the housing via a snap-fit ​​structure, thereby fixing the entire annular base and the three swing arms to the housing.

[0236] Figure 15 This is a top view of the combined structure of the cap, housing, and swing arm ring 5' in this embodiment. As shown, the retractable annular base 51' is fixed to the housing annular platform 43' by the snap-fit ​​structure of the fixing part 512'. Both the retractable annular base 51' and the swing arm beam 522' are supported on the annular platform 43'. The stop block 44' is located on the first side LC of the swing arm beam. Unlike embodiment 1, the stop block 44' spans the entire length of the swing arm beam. In this case, the contact area between the stop block and the swing arm beam is maximized to offset the external force exerted on the swing arm beam by the groove sidewall to the greatest extent, thus more reliably and stably preventing the swing arm from swinging to the first side.

[0237] The grooves in this embodiment are basically the same as those in Embodiment 1, also being circumferential grooves 65 with beveled surfaces. The difference is that each groove 651 in this embodiment is an asymmetrical groove, with different inclinations on the two side walls of the groove 651. Each groove 651 has an opening that opens inward toward the center, with two endpoints at the opening: a first endpoint DD1 and a second endpoint DD2. Adjacent grooves share a common vertex, meaning that the first endpoint of the preceding groove is also the second endpoint of the following groove. The first endpoint DD1 and the second endpoint DD2 of each groove 651 in the circumferential groove 65 are located on the same circumference, which is concentric with the circumference of the annular platform 43'. The angle α between the straight line BL1 containing the first side wall of each groove 651 and the radius RD1 corresponding to the first endpoint DD1 is 60°, and the first side wall is located on the second side of the radius RD1 corresponding to the first endpoint. The straight line BL2 containing the second side wall of the groove 651 extends along the direction of the radius RD2 corresponding to the second endpoint DD2. In other preferred embodiments, the angle between the straight line BL1 containing the first sidewall and the radius RD1 corresponding to the first endpoint DD1 can be selected within the range of 45° to 80°; the angle between the straight line BL2 containing the second sidewall and the radius RD2 corresponding to the second endpoint can be selected within the range of 0° to 10°. Preferably, in this embodiment, the two sidewalls of each groove 651 are set in the same way, which is beneficial to the uniform feel when tightening. Of course, in some embodiments, grooves with different inclinations can also be set, which can conveniently indicate the number of rotations.

[0238] Combination Figure 16-19 In this embodiment, the process of the swing arm moving and yielding is as follows: At position A1, the swing arm tooth 521' engages with the groove 6511, and the cap is screwed clockwise. The groove is subjected to a clockwise twisting force, and the first sidewall BL1 of the groove squeezes the swing arm tooth 521', forcing the swing arm beam to swing and yield to the second side of the swing arm. Thus, the first sidewall of the swing arm tooth 521' slides along the first sidewall BL1 of the groove 6511 to position A2. The twisting force is continued to be applied, and the swing arm tooth 521' slides along the first sidewall BL1 of the groove to the first end point DD1 of the groove. At this time, the swing yielding amplitude of the swing arm is the largest and reaches the critical position A3. This critical position is unstable. Under the restoring elasticity of the swing arm, the swing arm tooth 521' quickly engages with the next groove 6512 and reaches the re-engaged position A4. At this time, the groove 651 advances one step clockwise. By repeating the previous tightening action, the cap and the winding wheel can be rotated one circle at a time.

[0239] Figure 20 yes Figure 14 The illustrated embodiment shows top views and enlarged partial views of different positions where the rocker arm moves in the opposite direction to make room after the stop block is removed, including position B1 where the rocker arm tooth engages with the groove and position B2 during the intermediate process of rocker arm making room. Figure 16-19 and Figure 20It can be seen that the swing arm structure provided by this invention can achieve bidirectional movement and clearance without the presence of a stop. The swinging of the swing arm to both sides is not only due to the swinging of the swing arm beam itself, but also to the circumferential contraction of the telescopic section along the swing direction, which plays an important role. Figure 17-18 As shown, the wave-shaped structure of the retractable section contracts along the direction of the swing arm's swing, thereby reducing the difficulty of swinging the arm and improving the user's feel. The movement of the swing arm involves not only lateral swinging but also radial inward movement. The mechanism for this radial inward movement relies on the elasticity of the retractable annular base. In this embodiment, the retractable section of the annular base can not only extend and retract circumferentially but also has radial contraction elasticity. Because the retractable section has a wave-shaped structure, including crests and troughs, applying radial inward pressure near the troughs causes the entire retractable annular base to contract radially inward, thereby driving the swing arm to move radially inward.

[0240] In this embodiment, the connection between the swing arm beam and the telescopic section is a smooth transition near the trough position. The connecting arc of the telescopic section is a concave curve, that is, it is radially concave. When the swing arm beam applies radially inward pressure to the connecting arc of the telescopic section, since the direction of the pressure is consistent with the curvature direction of the connecting arc, the telescopic section can contract radially inward, thereby allowing the swing arm beam to make radial inward clearance.

[0241] In Example 1, the swing arm beam is mounted on a circular base. Each arc segment of the circular base is a convex curve. The internal stress of the circular base causes each arc segment to convex radially outward. The fixed end of the swing arm is located radially above the convex arc. When it applies radial inward pressure, forcing the circular base to move radially inward, the radial inward pressure applied by the swing arm is opposite in direction to the internal stress of the circular base. Therefore, the circular base prevents the swing arm from moving radially inward. Moreover, when the radial inward pressure is too large, it can easily cause the circular base to break. Therefore, as... Figure 9 As shown, in Example 1, there is only the swing arm's oscillation and no radial inward movement. Compared to Example 1, Example 2 has the advantage of radial inward movement, so tightening the strap requires less effort and feels better.

[0242] Figure 21 and Figure 22 The diagram shows the forces acting on the swing arm as it moves to both sides. As can be seen from the diagram, in the structure where the swing arm is fixed by rotating through the groove, the forces acting on the swing arm as it moves to both sides are bending forces. Specifically, the pressure applied to the swing arm teeth through the groove has a component force (F52 and F6) perpendicular to the long axis of the swing arm. We call this force the bending force, and the effect of the bending force is to cause the swing arm to deflect laterally, i.e., to swing.

[0243] like Figure 21As shown, when the cap is rotated along the tensioning direction, the force exerted on the rocker arm teeth by the first sidewall BL1 of the groove also has a radially inward component force F51. This radially inward component force F51 causes the rocker arm beam to move radially inward. It needs further explanation regarding the transmission process of the radially inward force F51. Although this radially inward force F51 is along the long axis of the rocker arm, compared to Embodiment 1, the tail of the rocker arm beam in this embodiment is not absolutely fixed. Therefore, the axial force will not concentrate within the rocker arm beam, causing buckling deformation. In this embodiment, the tail of the rocker arm beam is provided with two telescopic sections 5111' on both sides. As described above, after the radially inward component force is transmitted to the tail of the rocker arm beam, it will apply radially inward pressure to the two telescopic sections respectively. Under the action of this pressure, the telescopic sections will contract radially inward. Since the telescopic sections and the rocker arm beam are integrally formed, this causes the rocker arm beam to contract radially inward.

[0244] Figure 22 When the swing arm slides along the second sidewall BL2 of the groove, the force F6 exerted by the groove on the swing arm teeth is mainly a bending force. As the cap is screwed in the direction shown in the figure, the force exerted by the second sidewall of the groove on the swing arm teeth will have a small radial inward component. However, since the radial inward pressure is very small, the yielding mechanism of the swing arm is mainly elastic deformation swinging yielding when the cap is screwed in the direction shown in the figure. The radial inward displacement is relatively small compared to the radial inward displacement. Figure 21 The direction shown is much smaller. Because... Figure 22 The middle swing arm's yielding is mainly achieved through swinging, which is essentially bending deformation; while Figure 21 The mid-swing arm clearance mechanism is a dual-effect mechanism of bending deformation + radial movement, therefore Figure 21 The twisting force in the indicated direction makes it easier for the swing arm to move and give way.

[0245] Based on the above force analysis, it can be seen that the larger the angle between the groove sidewall and the long axis of the swing arm beam, the greater the radial force exerted by the groove on the swing arm, which is more conducive to the movement and yielding of the swing arm. Tightening the cap from the side with the larger angle to the side with the smaller angle is set as the tightening direction of the strap, resulting in a better user experience. When the groove sidewall is basically parallel to the long axis of the swing arm beam, the force on the swing arm is closer to a pure bending force, achieving swing yielding through elastic deformation. In this case, the yielding of the swing arm is more difficult than that of the double-effect yielding mechanism, so setting this direction as the reversible direction is better.

[0246] Example 3

[0247] This embodiment is basically the same in structure as Embodiment 2, except that the positions of the swing arm-stop and the groove are interchanged. Specifically, in this embodiment, the swing arm D52-stop D44 structure is located on the cap, and the groove J651 is located on the housing. In actual use, the swing arm D52-stop D44 structure rotates with the cap; the groove J651 remains stationary, and the sidewall of the groove J651 creates resistance to the movement of the swing arm teeth. This resistance causes the swing arm to bend and deform to swing and make way. Figure 23 As shown, the clockwise direction indicated by the arrow is the direction for tightening the strap. When an external force is applied in the clockwise direction, the sidewall of the groove applies a reverse resistance F7 to the rocker arm teeth, forcing the rocker arm D52 to shift counterclockwise. The stop D44 is located in the clockwise direction of the rocker arm, so the stop D44 allows the rocker arm D52 to shift counterclockwise to make room, and the cap can rotate clockwise. Figure 24 As shown, when a counterclockwise twisting force is applied, the rocker arm D52 attempts to rotate counterclockwise. At this time, the other side wall of the groove J651 applies a reverse resistance F8 to the rocker arm teeth, forcing the rocker arm to shift clockwise. However, since the stop block D44 is located in the clockwise direction of the rocker arm D52, it prevents the rocker arm D52 from shifting clockwise to make room. Therefore, the rocker arm teeth cannot disengage from the groove, and the cap cannot rotate in the opposite direction. Counterclockwise is the reverse direction.

[0248] The difference between this embodiment and embodiments 1 and 2 is that in this embodiment, the direction in which the cap can rotate is opposite to the direction in which the swing arm can swing; while in embodiments 1 and 2, the direction in which the swing arm can swing and make way is consistent with the direction in which the cap can rotate. The reason for this difference is related to whether the groove or the swing arm is located on the driving member, because the force that forces the swing arm to shift laterally comes from the pressure of the groove sidewall on the swing arm teeth; when the groove is located on the driving member, this pressure is basically consistent with the applied external force, so the direction of the swing arm shift is consistent with the direction of rotation; when the swing arm is located on the driving member, this pressure is a reverse force, so the direction of the swing arm shift is opposite to the direction of rotation.

[0249] The descriptions of the first and second sides of the swing arm and the groove in this application are consistent. This orientation is based on the state after the screw cap and housing are assembled; in other words, it is based on the orientation of the swing arm-groove structure in actual use. The first side of the groove corresponds to the first side of the swing arm, and the second side of the groove corresponds to the second side of the swing arm. For example, if the left side of the swing arm is considered the first side, then the right side of the swing arm can be considered the second side.

[0250] The above description is merely a preferred embodiment of the present invention and is a further detailed description of the present invention in conjunction with specific preferred embodiments. It should not be construed that the specific implementation of the present invention is limited to these descriptions. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A lacing device based on a swing arm structure, the lacing device comprising: A screw cap, a reel, and a housing, wherein the screw cap is rotatably mounted on the housing, and the reel is supported by the housing and can rotate relative to the housing; characterized in that... The screw cap is provided with one or more grooves; The reel is configured to wind up the tether when rotating in the tension direction and release the tether when rotating in the unwind direction; The housing is provided with one or more swing arms, each swing arm including at least a swing arm tooth and a swing arm beam. The swing arm includes a first side and a second side opposite to each other. The swing arm tooth is configured to engage the screw cap groove when the swing arm is in its original position. The swing arm beam and / or the swing arm tooth is configured to swing from its original position toward the first side of the swing arm, or from its original position toward the second side of the swing arm. The direction of the first side of the swing arm is the loosening direction of the strap device, and the direction of the second side of the swing arm is the tightening direction of the strap device. The housing is further provided with one or more stops, and at least the first side of the swing arm is adjacent to the stops; when the cap is subjected to an external force in the tensioning direction, the stops allow the swing arm beam and / or swing arm teeth to swing from their original position to the second side of the swing arm, so as to allow the cap to rotate in the tensioning direction; When the cap is subjected to an external force in the opening direction, the stop is configured to prevent the swing arm beam and / or swing arm teeth from swinging toward the first side of the swing arm, thereby preventing the cap from rotating in the opening direction.

2. The lacing device according to claim 1, characterized in that, The housing is provided with one or more swing arms along the circumference, and the swing arm teeth of each swing arm protrude radially outward along the circumference.

3. The lacing device according to claim 1, characterized in that, The screw cap has protrusions along its circumference, and the protrusions extend into the circumference, forming grooves between adjacent protrusions.

4. The lacing device according to claim 1, characterized in that, The stop block and the swing arm are separately configured and correspond one-to-one.

5. The lacing device according to claim 1, characterized in that, The housing is also provided with an annular base, and one or more swing arms are disposed on the circumference of the annular base, and the annular base is fixedly disposed on the housing.

6. The lacing device according to claim 5, characterized in that, The annular base is a retractable annular base, which includes at least one retractable segment, and the tail of the swing arm beam is connected to at least one retractable segment.

7. A lacing device based on a swing arm structure, the lacing device comprising: A screw cap, a reel, and a housing, wherein the screw cap is rotatably mounted on the housing, and the reel is supported by the housing and can rotate relative to the housing; characterized in that... The housing is provided with one or more grooves; The reel is configured to wind up the tether when rotating in the tension direction and release the tether when rotating in the unwind direction; The screw cap is provided with one or more swing arms, each swing arm including at least a swing arm tooth and a swing arm beam. The swing arm includes a first side and a second side opposite to each other. The swing arm tooth is configured to engage the housing groove when the swing arm is in its original position. The swing arm beam and / or the swing arm tooth is configured to swing from its original position toward the first side of the swing arm, or from its original position toward the second side of the swing arm. The direction of the first side of the swing arm is the tensioning direction of the strap device, and the direction of the second side of the swing arm is the loosening direction of the strap device. The cap is further provided with one or more stops, and at least the first side of the swing arm is adjacent to the stops; when the cap is subjected to an external force in the tensioning direction, the stops allow the swing arm beam and / or swing arm teeth to swing from their original position to the second side of the swing arm, so as to allow the cap to rotate in the tensioning direction; When the cap is subjected to an external force in the opening direction, the stop is configured to prevent the swing arm beam and / or swing arm teeth from swinging toward the first side of the swing arm, thereby preventing the cap from rotating in the opening direction.

8. A swing arm-groove-stop structure for a lacing device, characterized in that, include: One or more grooves provided along the circumference; One or more swing arms are arranged along a circumference, each swing arm including at least a swing arm tooth and a swing arm beam; each swing arm includes a first side and a second side opposite to each other; the swing arm tooth is configured to engage the groove when the swing arm is in its original position, and the swing arm beam and / or the swing arm tooth is configured to swing from its original position toward the first side of the swing arm, or from its original position toward the second side of the swing arm; wherein the direction of the first side of the swing arm is the loosening direction of the lacing device, and the direction of the second side of the swing arm is the tightening direction of the lacing device; One or more stops are provided, and at least one stop is provided adjacent to the first side of the swing arm, the stop and the swing arm are separately disposed; when the groove is subjected to a tension force, the stop is configured to allow the swing arm beam and / or swing arm teeth to swing from their original position to the second side of the swing arm, so as to allow the groove to move in the tension direction; When the groove is subjected to a loosening force, the stop is configured to prevent the rocker arm beam and / or rocker arm teeth from swinging from their original position toward the first side of the rocker arm, thereby preventing the groove from moving in the loosening direction.

9. The swing arm-groove-stop structure according to claim 8, characterized in that, The one or more swing arms are disposed on the circumference of a retractable annular base, and each swing arm extends radially outward along the circumference of the annular base; the retractable annular base includes at least one retractable segment, which is a wave-shaped structure or a spiral structure.

10. The swing arm-groove-stop structure according to claim 9, characterized in that, The tail section of each of the swing arm beams is connected to two telescopic sections, which extend toward a first side and a second side of the swing arm beam, respectively.

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