Tightening mechanism and non-return assembly thereof

Abstract

According to the fastening mechanism and the non-return assembly thereof, the novel non-return assembly of the fastening mechanism comprises the offset component, the stop component and the gear teeth, on one hand, the elastic arm of the offset component is high in deformability, the smoothness of a tightening lacing is improved, and the structural simplicity is considered; and on the other hand, reverse self-locking is formed by the neck joint part of the joint head part of the deflectable component and the non-return head part of the stop component, so that the anti-reverse reliability of the fastening mechanism can be greatly enhanced.

Description

Technical Field

[0001] The present invention relates to the field of daily necessities, and particularly to a fastening mechanism and its anti - reverse component. Background Art

[0002] The ratchet - pawl structure is a common mechanical structure for realizing one - way rotation. However, the traditional pawl - ratchet structure has a complex structural design when realizing the one - way rotation of the fastening mechanism. The existing anti - reverse components either have the problem of being too hard and laborious to use, or have the problem of poor anti - reverse ability.

[0003] Therefore, there is an urgent need for a new type of anti - reverse component with good feel in use and reliable anti - reverse performance to increase the market competitiveness of the fastening mechanism products. Summary of the Invention

[0004] The present invention provides a fastening mechanism and its anti - reverse component, which adopts a deflectable member - stop member - tooth as a new type of anti - reverse component. On the one hand, the elastic arm of the deflectable member has strong deformation ability, which improves the smoothness of tightening while taking into account the simplicity of the structure. On the other hand, the neck - connecting part of the engaging head of the deflectable member and the stop head of the stop member form reverse self - locking, which can greatly enhance the anti - reverse reliability of the fastening mechanism.

[0005] A fastening mechanism includes: a rotary cap, a winding wheel and a housing. The rotary cap is rotatably arranged on the housing, and the winding wheel is supported by the housing and can rotate relative to the housing. Among them,

[0006] The rotary cap is provided with teeth, and the teeth include one or more tooth grooves;

[0007] The winding wheel is configured to wind up the lacing when rotating in the fastening direction and release the lacing when rotating in the loosening direction;

[0008] The housing is provided with one or more deflectable members. The deflectable member includes an elastic arm and an engaging head that cooperates with the teeth of the rotary cap. The first end of the elastic arm is connected to the engaging head, and the second end of the elastic arm is connected to the housing. The engaging head includes engaging teeth and a neck - connecting part, and the engaging teeth are configured to be able to engage with the tooth grooves of the teeth;

[0009] The housing is also fixedly provided with one or more stop members. The stop member is located on one side of the engaging head in the loosening direction. The stop member includes a stop head, at least a part of the stop head is adjacent to the neck - connecting part, and the surface of the stop head adjacent to the neck - connecting part is a first relative surface. The first relative surface includes a self - locking support surface, and the self - locking support surface is set as an abnormal surface composed of one or more of an inclined plane, a concave surface, and a convex surface;

[0010] When an external force in the tightening direction acts on the screw cap, the stop member and the elastic arm allow the engaging head to deflect in the tightening direction until the engaging teeth move out of the tooth grooves of the gear teeth, so as to allow the screw cap to rotate in the tightening direction;

[0011] When an external force in the loosening direction acts on the screw cap, the engaging head deflects in the loosening direction until the neck joint portion abuts against at least part of the self-locking support surface, so that the engaging teeth always remain engaged with the tooth grooves of the gear teeth to prevent the screw cap from rotating in the loosening direction.

[0012] Preferably, the gear teeth are helical gear teeth. In this application, the helical gear teeth mean that the tooth grooves formed between adjacent teeth are asymmetric triangles, that is, the lengths of the two side walls of the tooth grooves are not equal.

[0013] The "deflection" in this application includes deflection, swing or bending. The deflection movement makes the engaging head no longer in the original position but tilt or bend to a certain extent.

[0014] In this application, if the position where the engaging teeth of the engaging head of the deflectable member are engaged with the tooth grooves of the gear teeth is set as the "original position", then "when an external force in the tightening direction acts on the screw cap, the stop member and the elastic arm allow the engaging head to deflect in the tightening direction until the engaging teeth move out of the tooth grooves of the gear teeth", the "the engaging head deflects in the tightening direction" means that the engaging head deflects to the tightening direction side of the original position; similarly, "when an external force in the loosening direction acts on the screw cap, the engaging head deflects in the loosening direction until the neck joint portion abuts against at least part of the self-locking support surface", the "the engaging head deflects in the loosening direction" means that the engaging head deflects to the loosening direction side of the original position.

[0015] In addition, "the engaging head is offset in the loosening direction until the neck joint portion abuts at least partially against the self-locking supporting surface" means that if there is no stop member, or the stop member does not have the anti-return head, then the engaging head can be offset in the loosening direction until the engaging teeth move out of the tooth groove of the gear tooth, and then the screw cap can also rotate in the loosening direction. Therefore, when an external force is applied to the screw cap, the engaging head of the offsettable member can be offset in the tightening direction relative to its original position until it disengages from the tooth groove of the gear tooth, or can be offset in the loosening direction relative to its original position until it disengages from the tooth groove of the gear tooth. That is to say, a single offsettable member-gear tooth assembly cannot achieve the function of effectively preventing the screw cap (and / or the winding wheel) from reversing. Only after setting a stop member with an anti-return head can the offset of the engaging head relative to its original position in the loosening direction that is sufficient to disengage from the tooth groove of the gear tooth be prevented, so as to play a role in preventing the screw cap and the winding wheel from reversing. In the present application, "the winding wheel is supported by the housing" includes that the winding wheel is located inside the housing, and the position of the winding wheel in the tightening mechanism is restricted by the housing.

[0016] Preferably, when the neck joint portion abuts at least partially against the self-locking supporting surface, the force exerted by the self-locking supporting surface on the neck joint portion has a component force that urges the engaging teeth to tightly abut against the tooth groove of the gear tooth. The "component force that urges the engaging teeth to tightly abut against the tooth groove of the gear tooth" includes a component force that urges the tooth tip of the engaging teeth to move towards the vertex of the tooth groove, and a component force that urges the engaging teeth to tightly abut against the side wall of the tooth groove. When the vertices of one or more tooth grooves are arranged along the circumference, the component force that urges the engaging teeth to tightly abut against the tooth groove of the gear tooth, that is: a radially outward (upward) component force along the circumference of the tooth groove where the contact point between the self-locking supporting surface and the neck joint portion is located.

[0017] Preferably, the special-shaped surface includes a special-shaped surface composed of inclined planes with different inclinations, a special-shaped surface composed of concave surfaces with different curvatures, a special-shaped surface composed of convex surfaces with different curvatures, a special-shaped surface composed of an inclined plane and a concave surface, a special-shaped surface composed of an inclined plane and a convex surface, a special-shaped surface composed of a concave surface and a convex surface, a special-shaped surface composed of concave surfaces with the same curvature, a special-shaped surface composed of convex surfaces with the same curvature, a special-shaped surface formed by an inclined plane and a concave surface and a convex surface, etc.

[0018] Preferably, the tooth tips of the engaging teeth of the engaging head of one or more offsettable members are arranged along the same circumference. This circumference is hereinafter referred to as the "housing circumference" for short.

[0019] Preferably, the vertices of one or more tooth grooves of the gear teeth are arranged along the same circumference. This circumference is hereinafter referred to as the "gear tooth circumference" for short. For example, in the present application, the projection of the tooth groove on the plane where the gear tooth circumference is located is V-shaped or inverted V-shaped, the vertex of the tooth groove is the vertex of the V shape, and the two points at the opening of the V shape are defined as the opening endpoints of the tooth groove.

[0020] The circumferences on which the tips of the engaging teeth are located and the circumferences on which the tooth grooves are located are concentric circumferences or parallel circumferences.

[0021] The self-locking support surface means that when the neck joint portion abuts against any point on the self-locking support surface, the force exerted by the self-locking support surface on the neck joint portion at the abutting point is either perpendicular to the radial direction of the housing circumference passing through the abutting point or has a component force along the radial direction of the housing circumference passing through the abutting point and outward. Under the action of this force, the engaging teeth of the engaging head can always remain engaged with the tooth grooves, thereby realizing the reverse self-locking function. It should be noted that all points on the self-locking support surface can be used as the abutting points for providing the self-locking force, but not all points on the self-locking support surface are actual abutting points. Only the points where the neck joint portion and the self-locking support surface come into contact after abutting are the actual abutting points. That is to say, the actual abutting points must be points on the self-locking support surface, but the points on the self-locking support surface are not necessarily actual abutting points.

[0022] Preferably, when the self-locking support surface is an inclined plane, the projection of the inclined plane on the plane where the housing circumference is located is an inclined line segment, and the inclined line segment includes at least one critical point. The radial direction of the circumference passing through the critical point is the critical radial direction; the inclined line segment is collinear with the critical radial direction, or the inclined line segment intersects the critical radial direction at the critical point and is located on one side of the critical radial direction in the loosening direction. Apparently, when the self-locking support surface is an inclined plane, the upper end point of the projection line segment of the inclined plane on the plane where the housing circumference is located is inclined towards the loosening direction side relative to the lower end point. The so-called upper end point is the point relatively far from the center of the housing circumference, and the lower end point is the point relatively close to the center of the housing circumference.

[0023] Among them, when the self-locking support surface is an inclined plane, the determination method of the critical radial direction: The radial direction of the housing circumference passing through any other point on the inclined line segment is located on one side of the critical radial direction in the loosening direction.

[0024] In this application, when it is determined that "line A is on the loosening direction side of line B", the part extending radially outward from the intersection point of line A and line B upward is used as the judgment reference. The radially outward part refers to the part located outside the housing circumference where the intersection point is located; if this part of line A is on the loosening direction side of the corresponding part of line B, then it is determined that "line A is on the loosening direction side of line B". In this application, the relative directions of the two tangent lines and the relative directions of the tangent line and the radial direction are all determined by the same determination method. Similarly, when determining that "line A is on the tightening direction side of line B", the same judgment reference and determination method are also used. The relative position relationship between the two radial directions can be directly determined by the clockwise or counterclockwise positions of the two radii relative to each other.

[0025] Preferably, when the self-locking supporting surface is a concave surface or a convex surface, the projection of the concave surface or convex surface on the plane where the circumference is located is an arc segment, the arc segment includes a critical point, and the tangent of any other point on the arc segment is located on one side of the tangent of the critical point in the loosening direction; the radial direction of the circumference passing through the critical point is the critical radial direction, and the tangent of any point on the curve segment is collinear with the critical radial direction or is located on one side of the critical radial direction in the loosening direction. Apparently, when the self-locking supporting surface is a concave surface or a convex surface, the upper end point of the projection arc of the concave surface or convex surface on the plane where the circumference of the housing is located is inclined towards the loosening direction side relative to the lower end point, and the method for identifying the upper and lower end points is the same as described above.

[0026] Wherein, when the self-locking supporting surface is a convex surface, the projection of the convex surface on the plane where the circumference of the housing is located is a convex arc, and the radial direction of the housing circumference passing through any other point on the convex arc is located on one side of the critical radial direction in the loosening direction.

[0027] Wherein, when the self-locking supporting surface is a concave surface, the projection of the concave surface on the plane where the circumference of the housing is located is a concave arc, and the radial direction of the housing circumference passing through any other point on the concave arc is located on one side of the critical radial direction in the tightening direction.

[0028] Preferably, the self-locking supporting surface can be a special-shaped surface composed of any two or more of an inclined plane, a concave surface, and a convex surface that meet the above conditions.

[0029] Preferably, the surface of the neck joint part adjacent to the retaining head part is the second opposite surface, the second opposite surface includes a self-locking mating surface, and the self-locking supporting surface and the self-locking mating surface are at least one of surface contact, line contact, or point contact. The surface contact means that the set of contact points forms a continuous surface; the line contact means that the set of contact points forms a line, and the line is a straight line segment or a curve segment; the point contact means that the contact points are one or more and are independent of each other.

[0030] Preferably, when the neck joint part abuts against the retaining head part, at least one of the contact points between the self-locking supporting surface and the self-locking mating surface is not the end point on the self-locking supporting surface closest to the neck joint part. When the self-locking supporting surface is an inclined plane and a convex surface, the point closest to the neck joint part is the critical point; when the self-locking supporting surface is a concave surface, the point closest to the neck joint part is the end point at the other end of the self-locking supporting surface opposite to the end where the critical point is located.

[0031] Preferably, the self-locking mating surface is an inclined plane, and the bottom end of the self-locking mating surface is inclined away from the self-locking supporting surface relative to its top end. The end of the self-locking mating surface facing the center of the housing circumference is the bottom end, and the end away from the center of the housing circumference is the top end.

[0032] More preferably, the plane passing through the top end point of the self-locking mating surface and the housing rotation axis is coplanar with the plane where the self-locking mating surface is located or intersects with the plane where the self-locking mating surface is located at an acute angle. When the self-locking mating surface is arranged in this way, even if the self-locking supporting surface and the self-locking mating surface are in contact only at the two end points of the self-locking supporting surface, the force exerted by the self-locking supporting surface on the neck joint part also has a component force radially outward (upward) along the contact point, preventing the engaging teeth from disengaging from the tooth grooves.

[0033] More preferably, when the neck joint part abuts against the stop head part, the self-locking supporting surface and the self-locking mating surface form a surface contact in a form-fitting manner.

[0034] The "in a form-fitting manner" means that the two surfaces in contact are complementary in shape and closely fit. For example: the cooperation between a plane and a plane, a concave surface and a convex surface.

[0035] When an external force in the loosening direction is applied to the engaging head part, the engaging head part deflects in the loosening direction until the neck joint part abuts against the stop head part, and the self-locking supporting surface and the self-locking mating surface form a surface contact in a form-fitting manner. At this time, the acting force exerted by the stop head part on the neck joint part is greater than the point contact, realizing a stronger self-locking function.

[0036] Preferably, the self-locking supporting surface is arranged as a first inclined plane, and the self-locking mating surface is arranged as a second inclined plane or a convex surface.

[0037] More preferably, when the neck joint part abuts against the stop head part, the first inclined plane and the second inclined plane are parallel. At this time, the first inclined plane and the second inclined plane are in surface contact. When in surface contact, the force exerted by the stop head part on the neck joint part is the largest, and the engaging teeth can be prevented from disengaging from the tooth grooves to the greatest extent.

[0038] Preferably, the self-locking supporting surface is arranged as a convex surface, and the self-locking mating surface is correspondingly arranged as a concave surface or an inclined plane.

[0039] More preferably, when the self-locking supporting surface is a convex surface and the self-locking mating surface is a concave surface, when the self-locking mating surface abuts against the self-locking supporting surface, the convex surface and the concave surface form a surface contact in a form-fitting manner.

[0040] Preferably, the self-locking supporting surface is arranged as a concave surface, and the self-locking mating surface is correspondingly arranged as a convex surface or an inclined plane.

[0041] More preferably, when the self-locking supporting surface is a concave surface and the self-locking mating surface is a convex surface, when the self-locking mating surface abuts against the self-locking supporting surface, the concave surface and the convex surface form a surface contact in a form-fitting manner.

[0042] Preferably, the anti-return head further includes a base portion, and the base portion of the anti-return head is correspondingly arranged with the connecting portion between the elastic arm and the neck joint portion.

[0043] Preferably, the engaging head further includes a tail portion, and the first end of the elastic arm is connected to the tail portion of the engaging head.

[0044] Furthermore, the base portion of the anti-return head is correspondingly arranged with the tail portion of the engaging head.

[0045] Preferably, the housing is fixedly provided with a plurality of deflectable members, and the plurality of deflectable members are independently formed and respectively connected to the housing, or the plurality of deflectable members are integrally formed.

[0046] Preferably, the second ends of the elastic arms of the one or more deflectable members are connected to a central ring, and the one or more deflectable members are connected to the housing through the central ring.

[0047] Preferably, the stop member is integrally formed with or fixedly connected to the housing.

[0048] Preferably, the stop members and the deflectable members are arranged in one-to-one correspondence.

[0049] Preferably, the stop member further includes a retaining beam, the anti-return head and the retaining beam are of an integral structure or are separately arranged, the retaining beam is adjacent to at least part of the elastic arm, and the main extension direction of at least part of the retaining beam and the main extension direction of at least part of the elastic arm form an equidistant curve. An equidistant curve is a curve in which the normal distance at each point on a given curve is everywhere equal, that is, the main extension curve of at least part of the retaining beam and the normal distance of the main extension direction of the elastic arm are everywhere equal.

[0050] When the screw cap is rotated in the loosening direction, the biasing force exerted by the side wall of the tooth groove of the gear teeth on the engaging teeth of the engaging head includes a component force radially outward of the screw cap and a component force circumferentially in the loosening direction. The component force circumferentially in the loosening direction causes at least part of the neck joint portion of the engaging head to abut against the self-locking support surface of the anti-return head. When an external force in the loosening direction is increased, the biasing force exerted on the engaging head by the tooth groove increases, and the biasing force received by the engaging head is transmitted to the elastic arm, prompting the elastic arm to undergo an elastic deformation of radially outward protrusion until the retaining beam of the stop member abuts against the deformed elastic arm. The retaining beam exerts a reaction force on the elastic arm to prevent the elastic arm from continuing to deform. Furthermore, the connecting end of the elastic arm and the engaging head cannot move further to make way, so that the engaging teeth of the deflectable member and the tooth groove of the gear teeth of the housing always remain engaged, and the screw cap cannot be rotated in the loosening direction, thereby achieving the function of preventing reverse rotation.

[0051] Preferably, the stop head and the retaining beam are of an integral structure, and at least part of the retaining beam and at least part of the elastic arm form a concentric circular arc section. Concentric circular arcs belong to equidistant curves, and the distance between the two is the radius difference.

[0052] Preferably, the stop head and the retaining beam are separately arranged. The retaining beam is of an integral structure or includes a plurality of retaining beam segments, and the trend line of one or more of the plurality of retaining beam segments and the main extension direction of the corresponding part of the elastic arm form an equidistant curve.

[0053] Preferably, the engaging head includes one or more engaging teeth.

[0054] Preferably, when the second opposite surface of the neck joint part is an inclined plane, the included angle between the main extension direction of the elastic arm and the inclination direction of the second opposite surface is a right angle or an acute angle. The inclination direction of the second opposite surface is the inclination direction of the projection of the second opposite surface on the plane where the circumference of the housing is located.

[0055] In the present invention, the "main extension direction" refers to the extension direction or trend of the vast majority of projection points in the projection of the object on the plane where the circumference of the housing or the circumference of the tooth is located. Small deformations and protrusions in the middle are allowed, but the overall extension direction remains unchanged. For example, the main extension direction of a rectangle is the length direction. It can be understood that the main extension direction of the elastic arm is generally the long axis direction of the elastic arm.

[0056] Preferably, the main extension direction of the elastic arm intersects the midline or equivalent midline of the neck joint part at an angle β, and 30° ≤ β ≤ 150°.

[0057] More preferably, the main extension direction of the elastic arm intersects the midline or equivalent midline of the neck joint part at an angle β, and 45° ≤ β ≤ 135°.

[0058] Further preferably, the main extension direction of the elastic arm intersects the midline or equivalent midline of the neck joint part at an angle β, and 60° ≤ β ≤ 120°.

[0059] Even more preferably, the main extension direction of the elastic arm intersects the midline or equivalent midline of the neck joint part at an angle β, and 80° ≤ β ≤ 110°.

[0060] The midline of the neck joint is defined as the line connecting the midpoints of the upper and lower contour lines of the regularly shaped neck joint. The upper contour line of the neck joint refers to the root contour line of the engaging tooth, and the lower contour line is parallel to the upper contour line and passes through the connection point of the neck joint and the elastic arm; if the neck joint is a substantially symmetric shape, the line connecting the midpoints of the upper and lower contour lines is taken as the midline of the neck joint; if the shape of the neck joint is significantly asymmetric, an equivalent midline is taken; the so-called equivalent midline refers to the midline of the neck joint corresponding to the first engaging tooth. The first engaging tooth refers to the engaging tooth closest to the stop head. The neck joint corresponding to the first engaging tooth refers to the part of the neck joint close to the stop head after dividing the neck joint along the extension line of the second side wall of the first engaging tooth, and then the equivalent midline is obtained according to the above definition of the midline of the neck joint. The second side wall of the engaging tooth refers to the side wall of the engaging tooth that bears the external force in the loosening direction. If the main extension direction of the elastic arm is a curve, the angle β here is the angle between the tangent direction at the intersection of the curve of the main extension direction and the midline or equivalent midline and the midline or equivalent midline.

[0061] The main extension direction of the elastic arm forms a certain angle with the midline or equivalent midline direction of the neck joint. Then, the force transmitted to the elastic arm through the engaging head is a biasing force, which forces the elastic arm to undergo elastic deformation. When the external force is removed, the elastic arm can return to its original shape. In particular, when the main extension direction of the elastic arm intersects the midline or equivalent midline of the neck joint at a right angle or approximately at a right angle, then when an external force is applied to the screw cap, regardless of whether the external force direction is along the tightening direction or the loosening direction, the external force applied by the screw cap to the engaging head through the tooth groove of the gear is a biasing force, and the component forces of this biasing force that cause the neck joint to shift or cause the elastic arm to bend are approximately equal. Therefore, if the tooth shape of the engaging tooth of the tooth groove of the gear and the engaging head is a symmetric tooth, the ability of the engaging head to shift relative to the original position in the tightening direction or the loosening direction is approximately the same. Even if the engaging tooth of the tooth groove of the gear and the engaging head is an asymmetric tooth, the difference in the biasing forces applied to the engaging head by the two side walls of the tooth groove of the gear is not particularly large. At this time, if there is no stop member or stop head, the offset member - gear assembly has no anti-reverse function at all.

[0062] Preferably, the tips of the engaging teeth of the engaging head of one or more offset members are arranged along the same circumference, and the main extension direction of the elastic arm is consistent with the circumferential direction of the parallel circumference of the circumference.

[0063] When an external force in the tightening direction acts on the screw cap, the tightening force causes the side wall of the tooth groove of the gear teeth to bias the engaging head, and the biasing force is transmitted to the elastic arm through the engaging head. The biasing force applied by the gear teeth includes a component force radially inward along the circumference of the gear teeth and a circumferential component force in the tightening direction. Under the action of the radially inward component force along the circumference of the gear teeth, the elastic arm will undergo elastic deformation, thereby driving the engaging head to move radially inward; the circumferential component force in the tightening direction mainly acts on the engaging head and has the same direction as the circumferential component force of the tightening force. In addition, the stop member does not prevent the engaging head from shifting in the tightening direction, and this circumferential component force causes the engaging head to undergo circumferential displacement (including flexural deformation, swinging or deflection). Therefore, under the action of the tightening force, the displacement of the engaging head includes a radially inward displacement component and a circumferential displacement component in the tightening direction along the tightening direction.

[0064] The force in the loosening direction causes the side wall of the tooth groove of the gear teeth to apply a biasing force to the engaging teeth of the engaging head. The biasing force includes a circumferential component force in the loosening direction and a component force radially outward along the circumference of the gear teeth. The component force radially outward along the circumference of the gear teeth causes the engaging teeth to closely abut against the tooth groove of the gear teeth, forming a first self-locking force; the circumferential component force in the loosening direction prompts the engaging teeth to shift in the loosening direction until at least part of the self-locking mating surface of the neck joint portion abuts against the self-locking supporting surface of the stop head portion. At the abutting position, the abutting manner between the self-locking supporting surface and the self-locking mating surface is at least one of point abutting, line abutting or surface abutting. The neck joint portion receives the biasing force transmitted by the engaging teeth, causing the neck joint portion to generate a biasing force on the stop head portion through the abutting position. At this time, the stop head portion generates a reverse extrusion force on the neck joint portion. The reverse extrusion force has a component force radially outward along the circumference of the housing, causing the engaging head to remain in the engaged position with the gear teeth, forming a second self-locking force. The dual self-locking function greatly enhances the anti-reversal function of the tightening mechanism. Among the three methods of point abutting, line abutting and surface abutting, surface abutting enables the stop head portion to provide a greater reverse extrusion force, provide a greater self-locking force, and achieve a better locking function.

[0065] The present invention also discloses a novel tightening mechanism, including: a screw cap, a wire reel and a housing. The screw cap is rotatably arranged on the housing, and the wire reel is supported by the housing and can rotate relative to the housing; wherein,

[0066] The housing is provided with gear teeth, and the gear teeth include one or more tooth grooves;

[0067] The wire reel is configured to wind up the lacing when rotating in the tightening direction and release the lacing when rotating in the loosening direction;

[0068] The screw cap is provided with one or more offsettable members. The offsettable member includes an elastic arm and an engaging head that mates with the teeth of the housing. The first end of the elastic arm is connected to the engaging head, and the second end of the elastic arm is connected to the screw cap. The engaging head includes engaging teeth and a neck joint. The engaging teeth are configured to engage with the tooth spaces of the teeth.

[0069] The screw cap is further fixedly provided with one or more stop members. The stop member is located on one side of the tightening direction relative to the engaging head. The stop member includes a stop head. At least a part of the stop head is adjacent to the neck joint. The surface of the stop head adjacent to the neck joint is a first opposing surface. The first opposing surface includes a self-locking support surface. The self-locking support surface is set as an irregular surface composed of one or more of an inclined plane, a concave surface, and a convex surface.

[0070] When an external force in the tightening direction is applied to the screw cap, the stop member and the elastic arm allow the engaging head to offset in the loosening direction until the engaging teeth move out of the tooth spaces of the teeth, so as to allow the screw cap to rotate in the tightening direction.

[0071] When an external force in the loosening direction is applied to the screw cap, the engaging head offsets in the tightening direction until the neck joint abuts against at least a part of the self-locking support surface, so that the engaging teeth always remain engaged with the tooth spaces of the teeth to prevent the screw cap from rotating in the loosening direction.

[0072] In this solution, when an external force in the loosening direction is applied, the biasing force of the side wall of the tooth space of the teeth against the engaging head is a reverse biasing force. The reason for the "reverse biasing force" is that the biasing force comes from the resistance of the external force in the loosening direction, and the circumferential component force of the biasing force along the circumference is opposite to the direction of the applied external force in the loosening direction. Whether it is a forward biasing force or a reverse biasing force, it belongs to a kind of biasing force. The forward and reverse are only simple distinctions based on the consistency of the direction of the biasing force and the external force.

[0073] When an external force in the loosening direction acts on the screw cap, the external force in the loosening direction causes the engaging head to abut against the side wall of the tooth groove of the housing. The abutting force causes the side wall of the tooth groove of the tooth to reversely bias the engaging head. At this time, the biasing force of the tooth groove on the engaging head has a component force radially outward along the circumference of the housing and a component force in the circumferential tightening direction. The radially outward component force causes the engaging head to have a displacement component that presses tightly against the tooth groove, preventing the engaging head from disengaging from the tooth groove and forming a first self-locking force. In this solution, the stop member is arranged on the tightening direction side of the displaceable member. Under the action of the component force in the circumferential tightening direction, it causes the engaging head to circumferentially shift in the tightening direction under the action of this force, so that at least part of the neck joint portion of the engaging head abuts against the first opposite surface of the anti-return head. Furthermore, the anti-return head applies a reverse squeezing force to the neck joint portion. This reverse squeezing force makes it difficult for the engaging head to further shift and displace. This reverse squeezing force has a radially outward component force that causes the engaging head to displace in the direction of pressing tightly against the tooth groove, forming a second self-locking force, and the engaging teeth can always remain engaged with the teeth of the housing to prevent the screw cap from rotating in the loosening direction.

[0074] The present invention also provides a check assembly for a tightening mechanism, comprising:

[0075] Teeth provided on the first component, including one or more tooth grooves;

[0076] One or more displaceable members provided on the second component, the displaceable member includes an elastic arm and an engaging head that cooperates with the teeth. The first end of the elastic arm is connected to the engaging head, and the second end of the elastic arm is connected to the second component; the engaging head includes engaging teeth and a neck joint portion, and the engaging teeth are configured to be able to engage with the tooth grooves of the teeth;

[0077] One or more stop members provided on the second component, the engaging head includes an opposite first side and a second side, the stop member is located on the first side of the engaging head, and the stop member and the displaceable member are separately arranged; the stop member includes an anti-return head, and at least part of the anti-return head is adjacent to the neck joint portion, and the surface of the anti-return head adjacent to the neck joint portion is a first opposite surface, and the first opposite surface includes a self-locking support surface, and the self-locking support surface is set as an abnormal surface composed of one or more of an inclined plane, a concave surface, and a convex surface;

[0078] When an external force in the tightening direction acts on the first component or the second component, the stop member and the elastic arm allow the engaging head to shift toward the second side until the engaging teeth move out of the tooth grooves of the teeth to allow the first component or the second component to rotate in the tightening direction;

[0079] When an external force in the loosening direction is applied to the first component or the second component, the engaging head offsets towards the first side until the neck joint portion abuts against the retaining head of at least a part of the retaining member, so that the engaging teeth always remain engaged with the tooth grooves of the gear teeth, preventing the first component and the second component from rotating in the loosening direction.

[0080] In this solution, when the first component is the screw cap (moving part) of the fastening mechanism and the second component is the housing (static part) of the fastening mechanism, the direction where the first side of the engaging head is located is the loosening direction of the mechanism, and the direction where the second side of the engaging head is located is the fastening direction of the fastening mechanism. When the first component is the housing (static part) of the fastening mechanism and the second component is the screw cap (moving part) of the fastening mechanism, the direction where the first side of the engaging head is located is the fastening direction of the mechanism, and the direction where the second side of the engaging head is located is the loosening direction of the fastening mechanism.

[0081] Only when the retaining member and the offsettable member are located on the same component can it be ensured that the retaining member and the offsettable member rotate as the component rotates, and the retaining member and the offsettable member can remain relatively stationary (excluding the offset movement, bending deformation, etc. of the offsettable member).

[0082] The beneficial effects of the present invention include the following aspects:

[0083] 1. Provide a novel anti-backflow assembly based on an offsettable member - retaining member - gear teeth, and apply it to the fastening mechanism, enriching the types of fastening mechanisms and increasing the diversity of user choices;

[0084] 2. The ingenious design and cooperation of the retaining head of the retaining member and the neck joint portion of the offsettable member enable the screw cap to form reverse self-locking under the action of an external force in the loosening direction, further enhancing the anti-reverse rotation performance of the anti-backflow assembly;

[0085] 3. The self-locking of the retaining head of the retaining member and the neck joint portion of the offsettable member, as well as the self-locking of the engaging teeth of the offsettable member and the side walls of the tooth grooves of the gear teeth, constitute a double self-locking effect under the loosening force. Coupled with the restriction of the bending deformation of the elastic arm by the retaining beam of the retaining member, the three effects are combined into one, greatly enhancing the anti-reverse rotation performance of the fastening mechanism. The design is ingenious and the anti-reverse rotation effect is remarkable;

[0086] 4. The deformation ability of the elastic arm in the offsettable member enables the fastening mechanism to operate with less effort and have a smooth feel when tightening the fastening belt; with excellent anti-reverse rotation performance, the fastening mechanism using this novel anti-backflow assembly not only has a good feel when tightening the fastening belt, but also can effectively prevent the fastening belt from accidentally loosening. Description of the Drawings

[0087] Figure 1It is an exploded structural schematic diagram of a fastening mechanism provided by the present invention, which uses an offset member - a stop member - a tooth as a check assembly;

[0088] Figure 2 It is a structural schematic diagram of the screw cap of the present invention;

[0089] Figure 3 It is a structural schematic diagram of the housing of the present invention;

[0090] Figure 4 It is a structural schematic diagram of the anti - reverse gear ring of the present invention;

[0091] Figure 5 It is a structural schematic diagram after the anti - reverse gear ring and the housing of the present invention are assembled;

[0092] Figure 6a It is Figure 1 A top view (the engaging tooth and the tooth groove engaging position) when the offset member has not yet shifted when an external force is applied to the shown fastening mechanism in the fastening direction;

[0093] Figure 6b It is Figure 6a A partial enlarged view at A1 in

[0094] Figure 7a It is Figure 1 A top view of different positions where the offset member shifts to make way when an external force is applied to the shown fastening mechanism in the fastening direction (the engaging tooth has partially separated from the tooth groove position);

[0095] Figure 7b It is Figure 7a A partial enlarged view at A2 in

[0096] Figure 8a It is Figure 1 A top view of different positions where the offset member shifts to make way when an external force is applied to the shown fastening mechanism in the fastening direction (the critical position where the engaging tooth shifts to make way);

[0097] Figure 8b It is Figure 8a A partial enlarged view at A3 in

[0098] Figure 9a It is Figure 1 A top view of different positions where the offset member moves to make way when an external force is applied to the shown fastening mechanism in the fastening direction (the position where the engaging tooth and the tooth groove are re - engaged);

[0099] Figure 9b It is Figure 9a A partial enlarged view at A4 in

[0100] Figure 10a It is Figure 1 A top view of the check assembly when an external force is applied to the shown fastening mechanism in the loosening direction;

[0101] Figure 10b is Figure 10a The partial enlarged view at B1 in and its force analysis diagram;

[0102] Figure 10c is Figure 10a The partial enlarged view at B2 in and its force analysis diagram;

[0103] Figure 10d is Figure 10a The partial enlarged view at B3 in and its force analysis diagram;

[0104] Figure 11a It is the top view of the check component when the neck joint part and the check head part of another embodiment of the fastening mechanism of the present invention are in contact;

[0105] Figure 11b is Figure 11a The partial enlarged view at C1 in and its force analysis diagram;

[0106] Figure 12a It is the top view of the check component when the neck joint part and the check head part of another embodiment of the fastening mechanism of the present invention are in contact;

[0107] Figure 12b is Figure 12a The partial enlarged view at C2 in and its force analysis diagram;

[0108] Figure 13a It is the top view of the check component when the neck joint part and the check head part of an embodiment of the fastening mechanism of the present invention are in contact;

[0109] Figure 13b is Figure 13a The partial enlarged view at C3 in and its force analysis diagram;

[0110] Figure 14 It is the top view of check head parts with different shapes;

[0111] Figure 15 It is the top view of the neck joint part and the check head part in contact in different ways;

[0112] Figure 16 It is the top view of another embodiment of the cooperation between the neck joint part and the check head part;

[0113] Figure 17 is the top view of another embodiment of the cooperation between the neck joint part and the check head part, where Figure 17a is the top view in the natural state, Figure 17b is the top view when in contact;

[0114] Figure 18 It is the top view of another embodiment of the offsettable member - stop member;

[0115] Figure 19 Yes Figure 1 The top view (the engaged position of the engaging teeth and the tooth grooves) of the offset member - gear component when the shown fastening mechanism removes the stop member;

[0116] Figure 20 Yes Figure 1 The top view of the deformed state of the offset member when the shown fastening mechanism is subjected to an external force in the loosening direction after removing the stop member;

[0117] Figure 21 Yes Figure 1 The top view of the critical position where the offset member moves in the opposite direction to make way when the shown fastening mechanism is subjected to an external force in the loosening direction after removing the stop member (the engaging teeth are disengaged from the tooth grooves);

[0118] Figure 22a The top view of the intermediate position where the offset member moves to make way when another fastening mechanism embodiment is subjected to an external force in the fastening direction (the position where the engaging teeth have been partially separated from the tooth grooves);

[0119] Figure 22b Yes Figure 22a The partial enlarged view at D1 in;

[0120] Figure 23a Yes Figure 22a The top view of the check component when the shown fastening mechanism is subjected to an external force in the loosening direction;

[0121] Figure 23b Yes Figure 23a The partial enlarged view at D2 in and its force analysis diagram;

[0122] Figure 24 Yes Figure 1 The top view of the offset member - gear - stop head component when only the stop head of the stop member in the shown fastening mechanism is retained;

[0123] Figure 25 Yes Figure 1 The top view of the offset member - gear - retaining beam component when the stop head of the stop member in the shown fastening mechanism is removed;

[0124] Figure 26 Yes Figure 25 The top view of the deformed state of the offset member when the shown fastening mechanism is subjected to an external force in the loosening direction;

[0125] Figure 27 Yes Figure 25 The top view of the critical position where the offset member moves in the opposite direction to make way when the shown fastening mechanism is subjected to an external force in the loosening direction (the engaging teeth are disengaged from the tooth grooves). Detailed implementation mode

[0126] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, where the same or similar reference numerals throughout represent the same or similar components or components with the same or similar functions. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0127] It should be understood that the terms indicating orientation or positional relationship used in the description of the present invention, such as "upper", "lower", "left", "right", "front", "rear", "length", "width", "horizontal", "vertical", "top", "bottom", "inner", "outer", etc., are all based on the orientation or positional relationship shown in the accompanying drawings, and are intended to facilitate the description of the present invention and simplify the description, and should not be construed as a limitation on the device or component that must have a specific orientation or specific positional relationship.

[0128] In addition, the terms "first" and "second" are only used for the purpose of differential description, without the connotation of relative importance, and are not intended to indicate or imply the quantity of technical features. Therefore, the features defined by "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "a plurality" is two or more, unless otherwise clearly defined.

[0129] Unless otherwise clearly specified, terms such as "connection" and "fixation" in the present invention should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrally formed; it can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0130] The following will make a detailed description of the novel check assembly based on the offset member - stopper - tooth groove and the novel fastening mechanism including the same in the present invention in conjunction with the accompanying drawings and specific embodiments.

[0131] Embodiment 1

[0132] As Figure 1 shown, a novel fastening mechanism includes a screw cap 1, a reverse tooth ring 2, a housing 3, a winding wheel 4, and a base 5. The base 5 can be fixedly arranged on the shoe upper, shoe tongue, clothing, or luggage. The reverse tooth ring 2 is arranged on the housing 3 through a snap structure. The structure of the winding wheel 4 and its connection method with the screw cap 1 can refer to the content of the patent document CN202321495677.8.

[0133] As Figure 2As shown, a retaining pin 14 is provided on the screw cap 1, and a retaining ring is provided on the wire winding wheel 4. When the retaining pin is in the first position relative to the retaining ring, the screw cap and the wire winding wheel are synchronously rotationally connected, and the anti-reverse gear ring 2 engages with the gear teeth of the screw cap to prevent the screw cap and the wire winding wheel from rotating in the direction of loosening the lace when a loosening force is applied to the screw cap, while allowing the screw cap and the wire winding wheel to rotate in the direction of tightening the lace when a tightening force is applied to the screw cap. When the retaining pin is in the second position relative to the retaining ring, the screw cap is separated from the wire winding wheel, the anti-reverse gear ring 2 is separated from the gear teeth of the screw cap, and the wire winding wheel can rotate freely relative to the screw cap. The following analysis of screwing the screw cap in the tightening direction and screwing the screw cap in the loosening direction is based on the state where the retaining pin is in the first position relative to the retaining ring.

[0134] As Figures 3 to 5 shown, the anti-reverse gear ring 2 includes three offsettable members 21 and a central ring 22. The three offsettable members 21 are connected to and integrally formed on the central ring 22, and the three offsettable members 21 are fixedly connected to the housing 3 through the central ring 22. The offsettable member 21 includes an engaging head formed by an engaging tooth 211 and a neck connecting portion 212, and an elastic arm 213. The engaging tooth 211 is an inclined tooth, and corresponding inclined gear teeth are provided on the screw cap 1. A stop member 31 is provided on the housing 3. The stop member 31 includes a stop beam 311 and a stop head 312. In this embodiment, three stop members 31 are provided on the housing 3, and the three stop members 31 are integrally formed with the housing 3. The three stop members 31 and the three offsettable members 21 are arranged in one-to-one correspondence. The stop head 312 and the stop beam 311 are an integral structure, and the stop beam 311 is adjacent to at least a part of the elastic arm 213, and the main extension direction LZ1 of the stop beam 311 and the main extension direction LZ2 of the elastic arm 213 form an equidistant curve (see Figure 9a ), and both are consistent with the concentric arc direction of the central ring 22. As shown in the figure, each engaging head in this embodiment includes two engaging teeth 2111 and 2112, and the shapes of each engaging tooth 2111 and 2112 are engaged with or separated from the tooth grooves 12 (tooth grooves 121 and 122) on the screw cap 1 (as shown in Figure 6). The tips of the engaging teeth 2111 and 2112 are also on a circumference, and this circumference is defined as the housing circumference; the vertices of the tooth grooves are also on the same circumference, and this circumference is defined as the gear tooth circumference. Among them, the housing circumference, the gear tooth circumference, and the central ring belong to parallel circumferences. When the engaging teeth are engaged with the tooth grooves, the three are coplanar concentric circumferences; the first end of the elastic arm 213 is connected to the engaging head, and the second end of the elastic arm 213 is connected to the housing 3 through the central ring 22; the stop member 31 is located on the side in the counterclockwise direction relative to the engaging head. As shown in the figure, the loosening direction of the tightening mechanism in this embodiment is the counterclockwise direction, and the stop head 312 of the stop member 31 is adjacent to the neck connecting portion 212. The surface where the stop head 312 is adjacent to the neck connecting portion 212 is the first relative surface NS1, and the surface where the neck connecting portion is adjacent to the stop head is the second relative surface NS2 (seeFigure 8b )。

[0135] When the fastening mechanism is assembled, first fasten the end face of the annular platform of the housing 3 to the anti-reverse gear ring 2 by snap-fitting, then press and fasten the rotary cover 1 onto the housing 3 for fixation, then install the wire reel 4 into the housing 3 (the housing 3 has an inner cavity), and finally thread the lacing and fix it to the base 5, and the fastening mechanism is assembled. Among them, the method of threading the lacing and the structure of the fastening mechanism for coupling the lacing can refer to the content of patent document CN202211616513.6 and patent document CN202321495677.8.

[0136] When using this fastening mechanism, press the rotary cover 1 forcefully until a "click" sound is heard, so that the engaging teeth 13 on the rotary cover 1 mesh with the engaging teeth 41 on the wire reel 4. At this time, the rotation of the rotary cover 1 can drive the wire reel 4 to rotate together. Rotate the rotary cover 1 in the tightening direction, and a clear "click-click" sound can be heard. At this time, the engaging teeth 2111, 2112 of the anti-reverse gear ring 2 engage with the tooth grooves 12 on the rotary cover 1, the engaging teeth on the upper end faces of the rotary cover 1 and the wire reel 4 mesh, and the rotary cover 1 drives the wire reel 4 to rotate in the tightening direction. The lacing is wound around the winding grooves of the wire reel 4 one by one, and the item to be tightened is slowly tightened by the lacing until it feels the right tightness. If it feels too tight, pull up the rotary cover 1, and the engaging teeth on the upper end faces of the rotary cover 1 and the wire reel 4 disengage. At this time, the taut lacing will drive the wire reel 4 to rotate in reverse, loosening the item. Then press the rotary cover 1 again and repeat the previous tightening operation to adjust the item to be tightened to the right tightness.

[0137] Such as Figures 6a - 9b, in this embodiment, when the screw cap 1 is screwed in the tightening direction (clockwise direction), at the initial position A1, the two engaging teeth 2111 and 2112 of the displaceable member 21 are engaged with the two tooth grooves 121 and 122 of the teeth 11 on the screw cap 1. The displaceable member 21 is in a natural extended state. At this time, there is a gap between the neck joint portion 212 of the displaceable member 21 and the anti-return head portion 312 of the stop member 31. When the screw cap 1 is screwed in the clockwise direction, the tooth grooves 121 and 122 are subjected to a screwing force in the clockwise direction. With the continuous application of the screwing force, the first side walls C1 and C2 of the tooth grooves 121 and 122 squeeze the first side walls B1 and B2 of the engaging teeth 2111 and 2112 of the displaceable member 21, forcing the elastic arms 213 and the engaging teeth 2111 and 2112 to displace and yield in the direction of the squeezing force. Specifically, the direction of the squeezing force is perpendicular to the first side walls B1 and B2 and radially inward. This squeezing force includes a circumferential component force in the clockwise direction and a radial inward component force along the circumference of the teeth. Therefore, under the action of this squeezing force, the displaceable member 21 simultaneously displaces clockwise along the circumference of the teeth and radially inward along the circumference of the teeth to reach the position A2. The radial inward component force along the circumference of the teeth is transmitted to the elastic arm 213 through the engaging head, forcing the elastic arm to move radially inward, thereby driving the engaging head to undergo a radial displacement. The elasticity of the elastic arm 213 makes the displacement and yielding of the engaging head smoother, and the stop member 31 does not hinder the displacement of the displaceable member 21 in these two directions. The first side walls B1 and B2 of the engaging teeth 2111 and 2112 of the engaging head slide along the first side walls C1 and C2 of the tooth grooves 121 and 122. By continuously applying the screwing force, the engaging teeth 2111 and 2112 slide along the first side walls C1 and C2 of the tooth grooves 121 and 122 to the first end points DD1 and DD2 of the tooth grooves 121 and 122, as shown in the figure to reach the position A3. At this time, the displacement and yielding amplitude of the engaging teeth 2111 and 2112 is the largest and reaches the critical position. This critical position is unstable. Under the restoring elastic force of the elastic arm 213, the engaging teeth 2111 and 2112 are quickly driven to engage with the next tooth grooves 120 and 121, reaching the re-engaged position A4. At this time, the tooth groove 12 advances one step in the clockwise direction. By repeating the previous tightening action, the screw cap 1 and the wire reel 4 can be rotated one by one in circles.

[0138] As Figure 10a and 10bAs shown, when the screw cap 1 is screwed in the loosening direction (counterclockwise), the second side walls C3 and C4 of the tooth grooves 121 and 122 bias the second side walls B3 and B4 of the engaging teeth 2111 and 2112. The two second side walls B3 and B4 of the engaging teeth 2111 and 2112 are respectively subjected to a biasing force F1. The biasing force F1 includes a circumferential component force f2 in the counterclockwise direction and a radial component force f1 radially outward along the circumference of the tooth. The radial component force f1 urges the engaging teeth 2111 and 2112 to remain engaged with the tooth grooves 121 and 122 of the screw cap 1. This radially outward radial component force f1 causes the engaging teeth 21 to tightly press against the side walls C3 and C4 of the tooth grooves 121 and 122, forming a first self-locking force for the engaging teeth 2111 and 2112 to remain engaged with the tooth grooves 121 and 122 of the screw cap 1. On the other hand, under the action of the circumferential component force f2, the engaging teeth 2111 and 2112 are offset in the counterclockwise direction until the neck joint portion 212 of the engaging head abuts against the anti-return head 312 of the stopper member 31. The first opposing surface NS1 is parallel to the second opposing surface NS2. The first opposing surface NS1 and the second opposing surface NS2 are in surface contact, and when the first opposing surface NS1 and the second opposing surface NS2 are in contact, the first opposing surface NS1 exerts a squeezing force F2 on the neck joint portion 212. The squeezing force F2 forms a second self-locking force for the engaging head to remain engaged with the tooth grooves 121 and 122 of the screw cap 1. The combined action of the squeezing force F2 and the biasing force F1 causes the engaging head to radially outwardly tightly press against the tooth grooves 121 and 122 of the screw cap 1. As Figure 10c shown, in this embodiment, the first opposing surface NS1 includes a self-locking supporting surface 313, which is set as a first inclined plane. The second opposing surface NS2 includes a self-locking mating surface 2121, which is set as a second inclined plane. The self-locking supporting surface 313 and the self-locking mating surface 2121 are in surface contact. As shown in the figure, the self-locking supporting surface is an inclined line segment 313 in the top view (parallel or coplanar with the plane where the circumference of the housing is located). This line segment is collinear with the circumferential radius R0 passing through the endpoints of this line segment. Therefore, in this embodiment, the force F2 exerted by the self-locking supporting surface on the neck joint portion is perpendicular to the self-locking supporting surface and points to the neck joint portion. This force has no radially outward component force, but it can also play a role in preventing the engaging teeth from disengaging from the tooth grooves. After all, there is no radially inward component force that causes the engaging teeth to have a tendency to disengage from the tooth grooves. Therefore, it can make the engaging teeth and the tooth grooves have a stable tendency to remain engaged. Combining Figure 10b and 10d, the engaging head is subjected to the biasing force F1 of the tooth groove. The circumferential component force f2 of the biasing force F1 in the counterclockwise direction urges the engaging head to shift counterclockwise. This shift of the engaging head gives way to applying a biasing force with a radially inward component force to the first end of the elastic arm 213. This biasing force causes the elastic arm 213 to bend radially outward. In this embodiment, when the engaging head abuts against the check head, the deformed elastic arm 213 also abuts against the retaining beam 311. At this time, the retaining beam 311 applies a squeezing force F5 to the elastic arm 213 at the abutting point. The squeezing force F5 is basically a radial force, which can prevent the elastic arm 213 from continuing to bend radially outward. Since the elastic arm 213 has a reaction force on the engaging head, it can prevent the engaging head from further shifting and giving way, and promotes the stable engagement of the engaging head with the tooth groove of the gear tooth. In this way, the triple effect of the double self-locking force and the retaining beam restricting the excessive deformation of the elastic arm is achieved, greatly enhancing the anti-reversal performance of the fastening mechanism. Only one retaining member 31 is needed to obtain the anti-reversal effect under a large loosening force. The design is ingenious and the anti-reversal effect is remarkable.

[0139] In this embodiment, both of the first opposite surfaces can be used as the self-locking supporting surfaces. The radial directions of the radial component forces of the biasing force F1 received by each engaging tooth 2111, 2112 respectively correspond to the radial directions passing through the acting points of the forces on each engaging tooth 2111, 2112. The radial direction of the radial component force of the squeezing force F2 applied by the first opposite surface NS1 to the second opposite surface NS2 of the neck joint portion 212 refers to the radial direction where the abutting point is located, that is, the P1 direction in the figure. In the description of this embodiment, the same reference numeral is used to label the same structure. In the case where there is no corresponding reference numeral in a single drawing, the drawing with the corresponding structural reference numeral can be referred to. In this embodiment, the main extension direction of the retaining beam 311 is the same as or substantially parallel to the main extension direction of the elastic arm 213 of the displaceable member 21, which can enable the retaining beam 311 to limit the bending deformation of any bent part of the elastic arm 213 when the loosening force is further increased, and prevent further deformation of any part of the elastic arm 213. Any other structural cooperation mode between the retaining beam 311 and the elastic arm 213 can be selected as long as it can achieve the limiting function of the retaining beam 311 on the elastic arm 213.

[0140] In a more preferred embodiment, such as Figure 11a and 11bAs shown, when the neck connection part and the check head part are in contact, the self-locking support surface and the self-locking matching surface are parallel inclined planes and in surface contact. As shown in the figure, the self-locking support surface is an inclined line segment X1 in the top view (parallel or coplanar with the plane where the shell circumference is located), and the line segment includes two endpoints D1 and D2, where D1 is the critical point, and the circumferential radial direction passing through the critical point D1 is the critical radial direction R01; the inclined line segment X1 intersects with the critical radial direction R01 at the critical point D1 and is located in the counterclockwise direction of the critical radial direction R01 (i.e., the release direction). According to the elastic force direction judgment rules between various contact surfaces, the self-locking support surface and the self-locking matching surface in this embodiment are plane-to-plane contact, and the neck connection part is a force-bearing object, so the direction of the force applied by the check head part to the neck connection part is perpendicular to the self-locking support surface X1 and points to the neck connection part, that is, as shown in Figure 11b is shown as Fz in. The radial direction of the circle passing through the end point D2 is R D2 ,R D2 Located in the clockwise direction of the oblique line segment X1, so the circumferential radial direction passing through any point on the oblique line segment X1 is located in the clockwise direction of the oblique line segment X1. Therefore, in this embodiment, the force Fz applied to the neck joint by each point on the self-locking bearing surface X1 has a radially upward component Fr along the abutment point, forming a self-locking force.

[0141] In other embodiments, the self-locking mating surface can also be a curved surface or a special-shaped surface, and the self-locking mating surface can be in contact with the self-locking support surface in a linear or point contact manner. According to the elastic force direction judgment rules between various contact surfaces, no matter the force-bearing surface contacts the force-applying plane in a linear, plane or point manner, the force direction is perpendicular to the plane through the contact point and points to the force-bearing object. Therefore, when the self-locking support surface is an inclined plane, the direction of the force applied to the neck connection part is perpendicular to the self-locking support surface through the contact point and points to the neck connection part. Only when the force has an upward component along the radial direction of the shell circumference where the contact point is located (i.e., the radial direction in FIG. 11) or has no component in the radial direction, can it constitute a self-locking force to prevent the engagement teeth from disengaging from the tooth groove. According to this rule, as long as the slope line of the projected line segment of the self-locking support surface is collinear with the radial direction passing through the critical point D1 or is located on the counterclockwise side of the critical radial direction R01, then the radial direction passing through each point on the projected line segment is located on the counterclockwise side of the critical radial direction or is collinear with the critical radial direction, no matter which point on the self-locking support surface the neck joint abuts against, the force applied by the self-locking support surface to the neck joint at the abutment point constitutes a self-locking force.

[0142] In other preferred embodiments, the self-locking bearing surface may also be a convex surface, such as Figure 12a and 12bAs shown, correspondingly, the self-locking mating surface is a concave surface, and when in contact, the self-locking supporting surface and the self-locking mating surface are in surface-to-surface contact. In this embodiment, the self-locking supporting surface is a convex arc H1 in the top view. This arc H1 includes two endpoints D3 and D4, where D3 is the critical point. The circumferential radial direction passing through the critical point D3 is the critical radial direction R02. The tangent line at the critical point is collinear with the radial direction R02 passing through this point. The circumferential radial direction passing through any other point on the convex arc H1 (such as R D4 and R D5 ) is on the counterclockwise side relative to the critical radial direction R02. The tangent line at any other point on the arc segment H1 is on the counterclockwise side relative to the tangent line direction at the critical point (i.e., the critical radial direction R02). For example, the intersection point of the tangent line T D5 at point D5 in the figure and the critical radial direction R02 is J. The circumferential arc passing through J is y1. According to the part above the intersection point J of the tangent line T D5 and the critical radial direction R02, that is, the part outside the circumferential arc y1, it is judged that the tangent line T D5 is on the counterclockwise side of the critical radial direction R02. The same method is used to judge the positional relationship between the tangent lines at other points and the tangent line at the critical point. According to the judgment rule of the elastic force direction of surface-to-surface contact, the force Fz exerted by the self-locking supporting surface on the neck joint part is perpendicular to the common tangent plane at the contact point and points to the neck joint part. Refer to Figure 12b for the force analysis at the midpoints D3, D5, and D4. Since the tangent line directions at other points on this convex arc are on the counterclockwise side of the circumferential radial direction R02 passing through this point (refer to the cases of points D4 and D5), for any point on this convex arc as the contact point, the force Fz exerted by the self-locking supporting surface on the neck joint part has a radial outward component force Fr greater than or equal to 0, which is used to prevent the engaging teeth from disengaging from the tooth grooves. Further, since the force exerted by the self-locking supporting surface on the neck joint part is perpendicular to the tangent line T direction of the contact point, no matter what shape the self-locking mating surface is, as long as there is a contact point between the self-locking supporting surface and the self-locking mating surface, the convex self-locking supporting surface can exert an effective self-locking force on any shape of the self-locking mating surface.

[0143] Similarly, in other preferred embodiments, the self-locking supporting surface can be a concave surface, such as Figure 13a and 13b shown. Correspondingly, the self-locking mating surface is a convex surface, and when in contact, the self-locking supporting surface and the self-locking mating surface are in surface-to-surface contact. The projection of the concave surface of the self-locking supporting surface on the plane where the circumference is located is a concave arc H2. This arc H2 includes two endpoints D6 and D7, where D6 is the critical point. The circumferential radial direction passing through the critical point D6 is the critical radial direction R03. The tangent line at the critical point is collinear with the radial direction R03 passing through this point. The circumferential radial direction passing through any other point on the concave arc H2 (such as R D7 and R D8)On the clockwise side relative to the critical radial R03, the tangent of any other point on the arc segment H2 is on the counterclockwise side relative to the tangent direction of the critical point (i.e., the critical radial R03). The judgment method is the same as described above (according to the part above the intersection of the two lines, such as the part outside the circumferential arcs y2 and y3). According to the judgment rule of the direction of the contact elastic force between surfaces, the force exerted by the self-locking support surface on the neck joint part is perpendicular to the common tangent plane at the contact point and points to the neck joint part. See Figure 13b the force analysis at the midpoints D6, D8, and D7. Since, except for the critical point D6 on this concave arc, the tangent directions of other points are on the counterclockwise side of the circumferential radial passing through this point (see the cases of points D7 and D8), for any point on this concave arc H2 as the contact point, the force Fz exerted by the self-locking support surface on the neck joint part has a radially outward component Fr greater than or equal to 0, which is used to prevent the engaging teeth from disengaging from the tooth grooves. Further, since the force exerted by the self-locking support surface on the neck joint part is perpendicular to the tangent T direction of the contact point, no matter what shape the self-locking mating surface is, as long as there is a contact point between the self-locking support surface and the self-locking mating surface, and at least one contact point is not the end point of the arc segment, the concave self-locking support surface can exert an effective self-locking force on any shape of the self-locking mating surface.

[0144] In other embodiments, the self-locking support surface of the anti-return head is not limited to the above single-shaped surfaces such as inclined planes, convex surfaces, and concave surfaces, but can also be a special-shaped surface formed by a combination of single-shaped surfaces that meet the above conditions. Among them Figure 14 shows several cases of special-shaped surfaces, but is by no means limited to the listed cases. Figures (a) and (b) are special-shaped surfaces composed of a convex surface and an inclined plane, and a concave surface and an inclined plane respectively; Figures (c) and (d) are special-shaped surfaces formed by connecting two concave surfaces and two convex surfaces with the same curvature respectively; Figure (e) is a smooth transition between a convex surface and an inclined plane, that is, the inclined plane and the tangent planes of some points on the convex surface are coplanar; (f) is a special-shaped surface formed by a concave surface and a convex surface with a common tangent plane.

[0145] The above figures all show the situation where the neck joint part and the joint head adopt surface contact. Figure 15Examples are given for the cases where the neck joint part and the joint head part are in line contact and point contact. Among them, in Fig. (a), the self-locking support surface of the inclined plane-shaped stop head part is in contact with the V-shaped self-locking mating surface, and the two are in line contact, where point D11 is the projection of the contact line. In Fig. (b), the self-locking support surface of the convex stop head part is in contact with the concave self-locking mating surface, and the curvature of the concave surface is smaller than that of the convex surface. If it is the contact between spherical crown-shaped concave and convex surfaces, it is point contact. If it is the contact between cylindrical concave and convex surfaces, it is line contact, where point D12 is the projection of the contact point or the contact line. Based on the self-locking support surface of the stop head part and the self-locking mating surface of the neck joint part, there are also many cases of surface shape matching, so the contact between the two also has more than two contact forms among surface contact, line contact, and point contact.

[0146] In this application, the process from the initial contact to the stable contact between the self-locking mating surface of the neck joint part and the self-locking support surface of the stop head part is a gradual one. Due to the shape configuration of the self-locking mating surface and the self-locking support surface, as well as the way of applying the loosening force, different contact forms such as point contact, line contact, and surface contact may occur before reaching the final stable state; even when reaching a temporary stable state, with the change of external forces during use, the contact form may also change accordingly. However, no matter which contact method it is, as long as there is an effective contact point, the self-locking support surface can apply an effective self-locking force to the neck joint part to prevent the tightening mechanism from rotating in the loosening direction. Among these three contact methods, because the surface contact has the most contact points, the self-locking force provided is the strongest, and it has the best effect of preventing reverse rotation.

[0147] In other preferred embodiments, the self-locking support surface is only a part of the first opposite surface of the stop head part, and there are still local surfaces in the first opposite surface that cannot provide self-locking force. As Figure 16 shown, the projection of the first opposite surface of the stop head part is a semi-circle, but only the thickened part ZM above the critical point L0 can be used as the self-locking support surface, which can provide an effective self-locking force for the neck joint part; the tangent direction at the critical point L0 is collinear with the radial direction R0’ of the circle where it is located. And the remaining part of the first opposite surface serves as the base B of the stop head part, which is correspondingly arranged with the tail part of the neck joint part with a smooth transition.

[0148] As Figure 17a and 17b shown, one end of the self-locking mating surface P of the neck joint part facing the center of the circle is the bottom end, and the end far from the center of the circle is the top end. The bottom end of the self-locking mating surface is inclined in the direction away from the self-locking support surface relative to the top end. The projection of the plane passing through the top end point of the self-locking mating surface and the housing rotation axis on the housing circumference is L1, and the projection of the self-locking mating surface P on the housing circumference is L2 (L2’), where L1 is collinear with L2 or intersects with L1 and L2’ at an acute angle α (the dotted line L2’ represents the projection of another embodiment of the self-locking mating surface). Figure 17ashows the forms of the self-locking support surface and the solid-line self-locking mating surface in the natural state, where L1 and L2 are collinear; as Figure 17b shown, when the mating head is offset and the solid-line self-locking mating surface abuts against the self-locking support surface, there is an included angle γ between L1 and L2. According to the force analysis of the contact between two planes in Fig. 11, this inclination angle setting of the self-locking mating surface P makes it such that when it abuts against the self-locking support surface satisfying the above conditions, regardless of whether the contact point between the two is at the end point, critical point, or a point other than the end point of the self-locking support surface, the force exerted by the self-locking support surface on the neck joint portion has a radially outward component force Fr towards the contact point. Figure 17b Fig. only shows the special case where the two only abut at the end point N closest to the neck joint portion in the self-locking support surface. In this case, the force Fz exerted by the self-locking support surface on the neck joint portion also has a radially outward component force Fr towards the contact point R N outward, which helps the mating head and the tooth groove of the gear to maintain locking. Thus, it can be seen that if there is an included angle α between L1 and L2' in the natural state (as shown by the dashed line L2' in Figure 17a ), then when the self-locking mating surface and the support surface abut, any point on the self-locking support surface as the contact point can exert an effective self-locking force on the neck joint portion. Moreover, as the α angle increases, the two gradually change from point contact to surface contact, and the self-locking force is the strongest and the anti-reverse effect is the best during surface contact.

[0149] In other preferred embodiments, the mating head may only include one mating tooth, as shown in Figure 18 , compared with the mating head having two mating teeth, the anti-reverse effect of the two mating teeth is better.

[0150] In the above embodiments, as shown in Figure 9a , the elastic arm 213 extends along the parallel circumferential direction of the housing circumference (or the central ring), and the stop member 311 also extends along the parallel circumferential direction of the housing circumference (or the central ring). The stop head and the retaining beam of the stop member 311 are of an integral structure, and the main extension direction of the retaining beam is substantially parallel to the main extension direction of the elastic arm of the offsettable member. In other preferred embodiments, the stop head and the retaining beam of the stop member may be separately provided, the retaining beam is of an integral structure or includes a plurality of retaining beam segments DP, Figure 18 shows that the retaining beam includes a plurality of retaining beam segments DP. In this embodiment, the trend line LZ3 of the plurality of retaining beam segments DP forms an equidistant curve with the main extension direction LZ4 of the corresponding part of the elastic arm EB.

[0151] In all embodiments of the present invention, the main extension direction of the elastic arm intersects the midline of the neck joint portion at an angle β, 30° ≤ β ≤ 150°. As shown in Figure 18 , the main extension direction LZ4 of the elastic arm is the long axial direction of the elastic arm. Figure 18In the illustrated embodiment, the center line ZL of the neck joint portion is the center connection line of the contour of the neck joint portion. The connection line of the root end points of the engaging teeth (i.e., the connection line of the two opening end points of the corresponding tooth sockets) is taken as the upper contour line K1 of the neck joint portion, and the line passing through the connection point of the neck joint portion and the elastic arm and parallel to the upper contour line is taken as the lower contour line K2 of the neck joint portion. The connection line of the midpoints of the upper and lower contour lines is the center line ZL of the neck joint portion. Since the main extension direction LZ4 of the elastic arm is a curve, the angle β is the angle between the tangent direction T at the intersection of the curve LZ4 and the center line ZL and the center line ZL. Figure 18 The included angle β1 therein is 92°. In other embodiments, this included angle can be any angle within 30° ≤ β ≤ 150°. The main extension direction of the elastic arm forms a certain included angle with the center line of the neck joint portion or the equivalent center line direction. Then, the force transmitted to the elastic arm through the engaging head is a biasing force, forcing the elastic arm to undergo elastic deformation. When the external force is removed, the elastic arm can return to its original shape. For the case where the engaging head has two engaging teeth, as Figure 9a shown, since the contour of the neck joint portion is obviously not a left-right symmetric structure, it is necessary to take the center line of the neck joint portion corresponding to the first engaging tooth as the equivalent center line, and take the neck joint portion of the counterclockwise direction part along the second side wall of the first engaging tooth as the neck joint portion corresponding to the first engaging tooth. According to the above method, the upper contour line k1 and the lower contour line k2 are made, and the midpoints of k1 and k2 are connected to obtain the equivalent center line ZL' of the neck joint portion. The included angle β2 between the main extension direction LZ2 of the elastic arm and the equivalent center line ZL' is 90°. β1 and β2 are preferably set to a right angle or an angle close to a right angle. Preferably, in Figure 9a the illustrated embodiment, the included angle δ between the main extension direction LZ2 of the elastic arm and the second opposite surface NS2 is 80°. In other preferred embodiments, the included angle between the main extension direction LZ2 of the elastic arm and the second opposite surface NS2 can be a right angle or other acute angles. In other preferred embodiments, the included angle δ can be any angle within 30° ≤ δ ≤ 120°; more preferably, 60° ≤ δ ≤ 100°.

[0152] In other embodiments, the shapes of the elastic arm 213 and the retaining beam 311 can be wavy or similar to a spiral structure, but the main extension directions of the retaining beam 311 and the elastic arm 213 should satisfy the limiting function of the retaining beam 311 on the elastic arm 213. In some other embodiments, the number of the offsettable member 21 and the stop member 31 can be one or more, and multiple offsettable members 21 can be independently formed and then respectively connected to the housing 3.

[0153] In other embodiments, the stop member 31 is separately formed and then fixedly connected to the housing 3.

[0154] In other preferred embodiments, the counterclockwise direction can also be set as the direction for tightening the lace, and the clockwise direction can be set as the direction for loosening the lace. At this time, the stop member 31 needs to prevent the deflectable member 21 from deflecting in the clockwise direction, so the setting position of the stop member 31 should be reasonably set according to the actual situation.

[0155] Figures 19 - 21 Yes Figure 1 The top view shows the different states of the deflectable member - gear tooth assembly when the shown fastening mechanism embodiment is subjected to an external force in the loosening direction after removing the stop member. The counterclockwise direction indicated by the arrow is the direction for loosening the lace. Among them Figure 20 and Figure 21 are drawn based on the photos at specific time points in the video captured by the video shooting device during the anti-reverse performance test. The specific formation process can be seen in the effect embodiment part below. Combining Figures 6a - 9b and Figures 19 - 21 it can be seen that the deflectable member - gear tooth groove assembly provided in the present application can achieve two-way movement and yielding without a stop member. The deflectable member 21 can deflect in the clockwise or counterclockwise direction relative to the starting engagement position ( Figure 19 the position shown). It is not only the offset of the engagement head itself, but also the elastic deformation of the elastic arm 213 that plays an important role. The excellent deformation ability of the elastic arm 213 reduces the difficulty of the offset of the engagement head and is beneficial to improving the user's feel. The movement and yielding of the deflectable member 21 are not only the offset of the engagement head to both sides in the clockwise or counterclockwise direction, but also include the movement and yielding of the engagement head radially inward. The realization mechanism of the radial inward movement of the deflectable member relies on the elastic deformation ability of the elastic arm 213.

[0156] Embodiment 2

[0157] The structure of this embodiment is basically the same as that of Embodiment 1, except that: the setting positions of the gear teeth 11, the anti-reverse gear ring 2 and the stop member 31 are different. That is, in this embodiment, the gear teeth 11 are arranged on the housing 3, and the mechanism formed by the deflectable member 21 - the stop member 31 is arranged on the screw cap 1. The stop member 31 is located on one side of the engagement head of the deflectable member 21 in the tightening direction.

[0158] In the actual use of this embodiment, as Figure 22a and 22b shown, the screw cap 1 rotates in the tightening direction. During actual use, the deflectable member 21 - stop member 31 mechanism rotates with the rotation of the screw cap 1; the tooth grooves 12 (tooth grooves 122, 123) are stationary, and the side walls of the tooth grooves 12 (tooth grooves 122, 123) generate resistance to the movement of the engagement head, and this resistance causes the deflectable member 21 to bend and deform to swing and yield. As Figures 22a - 22bAs shown, the clockwise direction indicated by the arrow is the direction for tightening the lacing. When an external force is applied to the screw cap 1 in the clockwise direction, the side walls of the tooth grooves 12 (tooth grooves 122, 123) apply a reverse resistance F' to the engaging teeth 2113, 2114, forcing the offsetable member 21 to offset in the counterclockwise direction. The stop member 31 is located in the clockwise direction of the engaging head, so the stop member 31 allows the offsetable member 21 to offset in the counterclockwise direction to make way, and the screw cap 1 can rotate in the clockwise direction. As Figure 23a and 23b ˋ shown, when a counterclockwise screwing force is applied to the screw cap 1, the offsetable member 21 attempts to rotate in the counterclockwise direction. At this time, the other side walls C3', C4' of the tooth groove 12 apply a reverse resistance F3 to the engaging teeth 2113, 2114, forcing the offsetable member 21 to offset in the clockwise direction. However, since the stop member 31 is located in the clockwise direction of the engaging head, the retaining beam 311 of the stop member 31 hinders the elastic arm 213 from bending radially outward in the circumferential direction of the screw cap. Only the engaging head can slightly offset in the clockwise direction until its neck joint portion 212 abuts against the retaining head of the stop member. The squeezing force F4 applied by the first opposite surface of the retaining head to the neck joint portion 212 includes a component force P3 radially outward along the circumference of the tooth. This component force P3 causes the engaging teeth 2113, 2114 to always remain engaged with the tooth groove 12, so the engaging teeth 2113, 2114 cannot be disengaged from the tooth groove 12 (tooth grooves 122, 123), and the screw cap 1 cannot rotate reversely. The counterclockwise direction is the anti-reverse direction.

[0159] In this embodiment, the rotation direction of the screw cap 1 is opposite to the offset direction of the engaging head of the offsetable member 21; while in Embodiment 1, the rotation direction of the screw cap 1 is the same as the offset direction of the engaging head of the offsetable member 21. The reason for this difference is related to which component, the tooth 11 or the offsetable member 21, is set on the driving member, because the force forcing the engaging head of the offsetable member 21 to offset laterally comes from the biasing pressure of the tooth groove side wall on the engaging tooth: when the tooth groove 12 is set on the driving member, this biasing pressure is in the same direction as the applied external force, so the offset direction of the engaging head of the offsetable member is the same as the rotation direction of the screw cap 1; when the offsetable member 21 is set on the driving member, the biasing pressure is opposite to the applied external force, so the offset direction of the engaging head of the offsetable member is opposite to the rotation direction of the screw cap 1.

[0160] Effect embodiment

[0161] When a loosening force is applied to the fastening mechanism provided in the present application via the lacing, the anti-reverse performance of the entire fastening mechanism is tested. At the same time, the stop member in the anti-reverse component provided in the present application is partially / entirely removed or retained as a comparative example to illustrate the anti-reverse mechanism and effect of the anti-reverse component. The following Specimen 1 is the fastening mechanism provided in the present application, and Specimens 2-4 are comparative embodiments.

[0162] Test principle: The maximum force value when the test specimen breaks, is damaged, or rotates at a certain tensile rate.

[0163] Test equipment: GT-AI-7000S tensile testing machine.

[0164] Specimen preparation: Overall tensile test of the fastening mechanism: Cut a 150-cm wire, couple the fastening mechanism with the wire according to the content described above, then rotate the fastening mechanism three times along the fastening direction, and cut the tail of the wire. All specimens of the fastening mechanism use transparent screw caps.

[0165] Test parameters: The tensile speed is set at 200 mm / min.

[0166] Test method: Install the TB-3 fixture on the tensile testing machine, adjust the distance between the upper and lower fixtures to 300 mm, press down the screw cap, and then fix the two ends of the tail of the wire in the fastening mechanism specimen to the upper and lower fixtures respectively; Start the stretching mode of the computer servo tensile machine and start the test at a speed of 200 mm / min until the fastening mechanism specimen is damaged or rotates, and immediately stop the machine; Record the maximum tensile force value shown in the test. During the test, use a video shooting device to take videos of the real-time state of the internal components of the fastening mechanism. The screw cap of the fastening mechanism uses a transparent material to facilitate shooting the real-time condition of the internal components. The video shooting device can be a high-definition camera or the camera of a smart phone, and the shooting pixel is required to be not less than 1080*1920 pixels.

[0167] Test specimens:

[0168] Specimen 1: Figure 1 The shown fastening mechanism;

[0169] Specimen 2: Figure 1 For the shown fastening mechanism, only the retaining head of the retaining member is retained. The retaining head is assumed to be one-fourth of the axial length of the entire retaining member, that is, only the front quarter of the retaining member of the fastening mechanism is retained. The top view of the deflectable member - gear - retaining head assembly is as Figure 24 shown;

[0170] Specimen 3: Figure 1 For the shown fastening mechanism, the retaining member is completely removed. The top view of the deflectable member - gear assembly is as Figure 19 shown.

[0171] Specimen 4: Figure 1 For the shown fastening mechanism, the retaining head of the retaining member is removed (i.e., only the retaining beam is retained). The retaining head is assumed to be one-fourth of the axial length of the entire retaining member, that is, the front quarter of the retaining member of the fastening mechanism is removed. The top view of the deflectable member - gear - retaining beam assembly is as Figure 25 shown.

[0172] Table 1 Data Sheet for Anti-Reversal Performance Test of Different Tightening Mechanism Specimens

[0173]

[0174] For each specimen, five groups of maximum tensile force values were tested, and then the average value was calculated as the maximum tensile force value that the specimen could withstand. According to the standards set by shoe manufacturers in the market, "maximum tensile force value ≥ 180 N" was used as the standard to determine whether the maximum tensile force value that the tightening mechanism specimen could withstand was qualified. The test results are shown in Table 1.

[0175] According to the data in Table 1, the specimen 1 had the best anti-reversal performance, and the specimen 4 had the worst anti-reversal effect. Comparing specimen 1 and specimen 2, the average maximum tensile force that the specimen 1 with a complete stop member could withstand was 239.6 N, which was higher than the standard of 180 N; the average maximum tensile force that the specimen 2 with only the retaining head could withstand was 231.2 N, which was also higher than the standard of 180 N and was only slightly lower than the specimen 1 with a complete stop member, indicating that the retaining component with only the retaining head already had excellent anti-reversal effect. The maximum tensile force values that specimen 3 and specimen 4 could withstand were both lower than the standard of 180 N, indicating that they did not have the anti-reversal effect required by shoe manufacturers.

[0176] Comparing the data of specimen 1 and specimen 4, it can be seen that the anti-reversal effect of the retaining component with only the retaining beam was very poor and could not meet the requirements of the tightening mechanism to prevent reversal. Comparing the test data of specimen 1, specimen 2, and specimen 4 further proved that the retaining head in the stop member was the main part to achieve the anti-reversal effect. In addition, although both specimen 3 and specimen 4 did not meet the performance indicators for preventing reversal, the anti-reversal effect of specimen 4 was worse. According to the previous discussion, the main function of the retaining head in the stop member is to prevent the offset of the engaging head, and the main function of the retaining beam is to prevent the elastic arm from bending radially outward. Comparing the test results of specimen 2 and specimen 4, it can be seen that as long as the offset of the engaging head in the offsettable component can be effectively prevented, the offset and yielding of the entire offsettable component can be effectively prevented.

[0177] Based on the entire test data sheet, when the stop member includes both the retaining head and the retaining beam, the retaining beam can further enhance the anti-reversal effect of the retaining component. This is because the retaining head directly hinders the offset and yielding of the engaging head, and at the same time the retaining beam prevents the elastic arm from bending radially outward, further eliminating the possibility of the elastic arm driving the engaging head to shift. Therefore, the two complement each other and comprehensively improve the overall anti-reversal effect of the retaining component.

[0178] Since the anti-reversal performance of Specimen 4 with only the retaining beam structure is even lower than that of Specimen 3 with the stop member completely removed, to figure out the reason, based on the high-definition videos of the real-time states of the internal components of Specimen 3 and Specimen 4, the images at important time points were intercepted, and the state diagrams of the internal components at the corresponding time points were drawn according to the intercepted video images, where Figure 20 is the top view of the offset member - gear assembly when the elastic arm of Specimen 3 undergoes the maximum radial outward deformation; Figure 21 is the top view of the critical position where the offset member of Specimen 3 moves in the reverse direction to make way, at this time the engaging tooth disengages from the tooth groove. Figure 26 is the top view of the elastic arm of Specimen 4 when it deforms and abuts against the retaining beam, at this time the engaging tooth and the tooth groove are still fully engaged; Figure 27 is the top view of the critical position where the offset member of Specimen 4 moves in the reverse direction to make way, at this time the engaging tooth disengages from the tooth groove. According to Figures 20 - 21 the state diagram of the internal components of Specimen 3 shown in Figures 26 - 27 and the state diagram of the internal components of Specimen 4 shown in

[0179] 1. By applying a loosening force to the spool via the lacing, for the latching mechanism Specimen 3 with the stop member completely removed, the external force is transmitted to the elastic arm through the engaging head. The elastic arm bends radially outward until the deformed elastic arm abuts against the tooth tip of the gear. At this time, the radial outward deformation amplitude of the elastic arm is the largest, as shown in Figure 20 ; when the external force is further increased, the elastic arm can no longer bend radially outward. Under the biasing action of the tooth groove of the gear, the engaging head shifts in the loosening direction. At the same time, the deformed elastic arm has an elastic force to return to its original state, and this elastic force urges the tail of the engaging head to shift in the latching direction. Under the dual action of the biasing force of the tooth groove of the gear and the restoring elastic force of the elastic arm, the engaging head undergoes a large shift, and the engaging tooth gradually leaves the tooth groove of the gear. As the restoring elastic force of the elastic arm is released and the displacement of the engaging tooth causes the engaging head to shift radially inward until the engaging tooth is completely disengaged from the tooth groove of the gear, as shown in Figure 21 , the spool realizes reverse rotation.

[0180] 2. When only the retaining beam is set as the stop member, the loosening force applied to the spool via the lacing is transmitted to the elastic arm through the engaging head. The elastic arm bends radially outward until the deformed elastic arm abuts against the retaining beam. At this time, the elastic arm cannot continue to bend radially outward, as shown in Figure 26 . Obviously, the radial outward bending amplitude of the elastic arm of Specimen 4 is much smaller than that of Figure 20The radially outward bending deformation amplitude of the elastic arm of the sample 3 shown can be said to be very small when the engaging teeth and the tooth grooves remain engaged, and the elastic arm of the sample 4 is radially outward bent under the blocking action of the retaining beam. Similarly, as the external force further increases, since the elastic arm cannot be further bent radially outward, under the biasing action of the tooth grooves of the gear teeth, the engaging head can only shift in the loosening direction. As described above, under the dual action of the biasing force of the tooth grooves of the gear teeth and the restoring elastic force of the elastic arm, the engaging teeth gradually leave the tooth grooves of the gear teeth, and the spool rotates in the reverse direction, as Figure 27 shown. Therefore, in the case where only the retaining beam exists, the fastening mechanism does not have a qualified anti-reverse effect and the anti-reverse effect is worse than that of the fastening mechanism without the stop member completely removed. The reason is that: the maximum tensile force value that the fastening mechanism can withstand when damaged and reversed is determined by the combined external force that can be borne by the offset and yielding of the engaging head and the radially outward bending deformation of the elastic arm. The retaining beam limits the amplitude of the radially outward bending deformation of the elastic arm, and the external force consumed by the deformation of the elastic arm is reduced; therefore, when reversed, the maximum tensile force value that the sample 4 can withstand is smaller than that of the sample 3, and the anti-reverse effect is worse.

[0181] On the other hand, the data of the above anti-reversal performance test proves that the anti-reversal mechanism of the check component provided by the present application is different from that of the elastic pawl-housing tooth check component in the prior art. The anti-reversal effect of the existing elastic pawl-housing tooth check component is mainly achieved by preventing the radial outward bending deformation of the elastic arm of the pawl. Because when a loosening force is applied to the fastening mechanism, when the elastic pawl arm attempts to radially outwardly bend and deform, it will abut against the tip of the housing tooth, and the housing tooth prevents the elastic pawl arm from radially outwardly bending and deforming. Also, because the pawl tooth is directly provided at the distal end of the elastic pawl arm, the connection part between the pawl tooth and the elastic pawl arm is basically in the same direction as the extension direction of the elastic pawl arm, and the angle between the pawl tooth and the elastic pawl arm cannot be changed. Therefore, the bending deformation of the elastic arm is the only inducement for driving the displacement of the pawl tooth. As long as the radial outward bending deformation of the elastic pawl arm is prevented, the pawl tooth can always engage with the housing tooth, thereby achieving the anti-reversal effect. In the present application, the engaging tooth is connected to the elastic arm through a neck joint, and the center line or equivalent center line of the neck joint intersects with the main extension direction of the elastic arm at a certain angle. When an external force in the loosening direction is applied, the engaging tooth drives the neck joint to shift, causing the angle between the engaging head and the main extension direction of the elastic arm to change. Coupled with the fact that the distal end of the elastic arm is connected to the engaging head, the elastic deformation ability of the elastic arm enables the engaging head to shift radially inward while shifting in the loosening direction, thereby finally realizing the disengagement of the engaging tooth from the tooth groove of the gear tooth. Therefore, the displacement of the engaging head itself (including the shift in the loosening direction and the radial inward shift) and the bending deformation of the elastic arm in the offset member provided by the present application are both inducements for causing the displacement of the engaging tooth. Moreover, according to the test results of Specimens 2, 3, and 4, the displacement of the engaging head is the direct inducement for causing the engaging tooth to disengage from the tooth groove of the gear tooth, with the greatest influencing effect. Although the retaining beam can prevent the radial outward bending deformation of the elastic arm, thereby indirectly affecting the displacement of the engaging head, the retaining beam cannot prevent the direct offset of the engaging head under the action of an external force. Therefore, relying solely on the retaining beam to prevent the bending deformation of the elastic arm in the present application cannot prevent the offset member from moving and yielding in the loosening direction, and thus does not have the anti-reversal effect. This is also the biggest difference between the offset member in the present application and the elastic pawl in the prior art, that is: setting a stop head in the present application to prevent the direct offset and yielding of the engaging head is a necessary way to achieve the anti-reversal effect, and relying solely on the retaining beam to prevent the bending deformation of the elastic arm cannot achieve the anti-reversal effect; in the prior art, the pawl tooth can only be driven to move away from the housing tooth by the bending deformation of the elastic arm of the pawl, so preventing the deformation of the elastic pawl arm is the only effective way to achieve the anti-reversal effect.

[0182] The above are only the preferred embodiments of the present invention, and are further detailed descriptions of the present invention in combination with specific preferred implementation manners. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A tightening mechanism, comprising: A rotary cover, a winding wheel and a housing, wherein the rotary cover can be rotatably arranged on the housing, and the winding wheel is supported by the housing and can rotate relative to the housing; characterized in that: The rotary cover is provided with gear teeth, and the gear teeth include one or more tooth grooves; The reel is configured to wind up the lace when rotating in a tightening direction and release the lace when rotating in a loosening direction; The housing is provided with one or more deflectable members, the deflectable members include an elastic arm and an engagement head, the first end of the elastic arm is connected to the engagement head, and the second end of the elastic arm is connected to the housing; the engagement head includes an engagement tooth and a neck connection portion, the engagement tooth is configured to engage with the tooth groove of the gear tooth; The housing is further fixedly provided with one or more stopper members, the stopper members are located at one side of the loosening direction relative to the engaging head, the stopper member includes a non-return head, at least part of the non-return head is arranged adjacent to the neck connection portion, and the surface of the non-return head adjacent to the neck connection portion is a first opposing surface, the first opposing surface includes a self-locking support surface, and the self-locking support surface is arranged as a special-shaped surface composed of one or more of an inclined plane, a concave surface, and a convex surface; Wherein, when the rotary cover is subjected to an external force in the tightening direction, the stop member and the elastic arm allow the engaging head to deviate in the tightening direction until the engaging tooth moves away from the tooth groove of the gear tooth, so as to allow the rotary cover to rotate in the tightening direction; When the rotary cover is subjected to an external force in a loosening direction, the engaging head is offset in the loosening direction until the neck connection portion abuts against at least a portion of the self-locking support surface, so that the engaging teeth always remain engaged with the tooth grooves of the gear teeth to prevent the rotary cover from rotating in the loosening direction.

2. The tightening mechanism according to claim 1, characterized in that: When the neck portion abuts against at least a portion of the self-locking support surface, the force applied by the self-locking support surface to the neck portion has a component force that causes the engaging tooth to press against the tooth groove of the gear tooth.

3. The tightening mechanism according to claim 1, characterized in that: The tooth tips of the engaging teeth of the one or more displaceable components are arranged along the same circumference. When the self-locking supporting surface is an inclined plane, the projection of the inclined plane on the plane where the circumference is located is an inclined line segment, and the inclined line segment includes at least one critical point, and the radial direction of the circumference passing through the critical point is the critical radial direction; the inclined line segment is collinear with the critical radial direction, or the inclined line segment intersects with the critical radial direction at the critical point and is located on one side of the release direction of the critical radial direction.

4. The tightening mechanism according to claim 1, characterized in that: The tooth tips of the engaging teeth of the one or more displaceable components are arranged along the same circumference. When the self-locking supporting surface is a concave surface or a convex surface, the projection of the concave surface or the convex surface on the plane where the circumference is located is an arc segment, and the arc segment includes a critical point. The tangent of any other point on the arc segment is located on one side of the loosening direction relative to the tangent of the critical point; the radial direction of the circumference passing through the critical point is the critical radial direction, and the tangent of any point on the curved segment is collinear with the critical radial direction, or is located on one side of the loosening direction relative to the critical radial direction.

5. The tightening mechanism according to claim 1, characterized in that: The surface of the neck portion adjacent to the check head is a second opposing surface, and the second opposing surface includes a self-locking matching surface. The self-locking supporting surface and the self-locking matching surface are in at least one of surface contact, line contact or point contact.

6. The tightening mechanism according to claim 5, characterized in that: The self-locking support surface and the self-locking mating surface are in surface contact, wherein when the self-locking support surface is set as a first inclined plane, the self-locking mating surface is set as a second inclined plane; when the self-locking support surface is set as a convex surface or a concave surface, the self-locking mating surface is correspondingly set as a concave surface or a convex surface.

7. The tightening mechanism according to claim 1, characterized in that: The shell is fixedly provided with a plurality of deflectable components, the plurality of deflectable components are independently formed and respectively connected to the shell, or the plurality of deflectable components are integrally formed.

8. The tightening mechanism according to claim 1, characterized in that: The second ends of the elastic arms of the one or more deflectable members are connected to a central ring, and the one or more deflectable members are connected to the housing through the central ring.

9. The tightening mechanism according to claim 1, characterized in that: The stop member also includes a stop beam, the check head and the stop beam are an integral structure or separately arranged, the stop beam is arranged adjacent to at least part of the elastic arm, and the main extension direction of at least part of the stop beam and the main extension direction of at least part of the elastic arm form an equidistant curve.

10. The tightening mechanism according to claim 1, characterized in that: The one or more tooth grooves are arranged along the circumference of the gear tooth, the main extension direction of the elastic arm is consistent with the circumference of the circle parallel to the circumference of the gear tooth, the main extension direction of the elastic arm intersects with the center line of the neck connection part or the equivalent center line to form an angle β, and 30°≤β≤150°.

11. A tightening mechanism, comprising: A rotary cover, a winding wheel and a housing, wherein the rotary cover can be rotatably arranged on the housing, and the winding wheel is supported by the housing and can rotate relative to the housing; characterized in that: The housing is provided with gear teeth, and the gear teeth include one or more tooth grooves; The reel is configured to wind up the lace when rotating in a tightening direction and release the lace when rotating in a loosening direction; The rotary cover is provided with one or more deflectable members, the deflectable members include an elastic arm and an engagement head, the first end of the elastic arm is connected to the engagement head, and the second end of the elastic arm is connected to the rotary cover; the engagement head includes an engagement tooth and a neck connection portion, the engagement tooth is configured to engage with the tooth groove of the gear tooth; The screw cap is also fixedly provided with one or more stopper members, the stopper members are located at one side of the tightening direction relative to the engagement head, the stopper member includes a non-return head, at least part of the non-return head is arranged adjacent to the neck connection portion, and the surface of the non-return head adjacent to the neck connection portion is a first opposing surface, the first opposing surface includes a self-locking support surface, and the self-locking support surface is arranged as a special-shaped surface composed of one or more of an inclined plane, a concave surface, and a convex surface; When the rotary cover is subjected to an external force in the tightening direction, the stop member and the elastic arm allow the engaging head to deflect toward the loosening direction until the engaging teeth move away from the tooth grooves of the gear teeth, so as to allow the rotary cover to rotate in the tightening direction; When the rotary cap is subjected to an external force in a loosening direction, the engaging head is offset toward the tightening direction until the neck connection portion abuts against at least a portion of the self-locking support surface, so that the engaging teeth always remain engaged with the tooth grooves of the gear teeth to prevent the rotary cap from rotating in the loosening direction.

12. A non-return assembly for a tie-down mechanism, characterized in that: include: A gear tooth disposed on the first component includes one or more tooth grooves; One or more deflectable members disposed on the second component, the deflectable members comprising a resilient arm and an engaging head, a first end of the resilient arm being connected to the engaging head, and a second end of the resilient arm being connected to the second component; the engaging head comprising engaging teeth and a neck portion, the engaging teeth being configured to engage with the tooth grooves of the gear teeth; One or more stopper members are arranged on the second component, the engaging head includes a first side and a second side opposite to each other, the stopper member is located on the first side of the engaging head, and the stopper member and the deflectable member are arranged separately; the stopper member includes a check head, at least a part of the check head is arranged adjacent to the neck portion, and the surface of the check head adjacent to the neck portion is a first opposing surface, the first opposing surface includes a self-locking bearing surface, and the self-locking bearing surface is arranged as a special-shaped surface composed of one or more of an inclined plane, a concave surface, and a convex surface; When the first component or the second component is subjected to an external force in the tightening direction, the stop member and the elastic arm allow the engaging head to deflect toward the second side until the engaging tooth moves away from the tooth groove of the gear tooth, so as to allow the first component or the second component to rotate in the tightening direction; When the first component or the second component is subjected to an external force in the loosening direction, the engaging head is offset toward the first side until the neck connection portion abuts against at least a portion of the self-locking support surface, so that the engaging teeth always remain engaged with the tooth grooves of the gear teeth to prevent the first component and the second component from rotating in the loosening direction.

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