Lacing adjustment device and article having same

Abstract

The utility model discloses a kind of lace adjusting device and the article with it of being convenient for adjusting lace tightening and loosening. Lace adjusting device includes shell, winding assembly, coupling assembly, bottom plate assembly and rotary drive assembly, winding assembly can be movably erected in bottom plate assembly and be placed in hollow inner cavity, coupling assembly and winding assembly can be linked, rotary drive assembly and shell movable buckling and can relatively rotate. When coupling assembly and winding assembly are in meshing state, rotary drive assembly can drive coupling assembly to rotate along first direction and further drive winding assembly to rotate to tighten lace;Rotary drive assembly can also drive coupling assembly to rotate along second direction and further drive winding assembly to move along first axial direction and press against bottom plate assembly, until coupling assembly and winding assembly disengage from meshing state, and winding assembly is driven by bottom plate assembly and reengaged with coupling assembly, so as to realize lace micro-release, convenient for user operation and carry out fine loosening lace adjustment.

Description

Technical Field

[0001] This utility model relates to the field of daily necessities technology, and in particular to a strap adjustment device and a product having the same. Background Technology

[0002] For tightening and loosening the laces of shoes, bags, clothing, hats, or other items, an adjustable lace-up device can be installed on the item. This device allows for precise adjustment of the laces. Currently, lace-up adjustable devices typically have two positions: tighten and loosen. When the device is in the tightening position, the laces can be tightened by rotating it in the tightening direction. To loosen the laces, the device must be switched to the loosening position. In some scenarios, such as when a user wants to finely loosen shoelaces after tightening them, switching the adjustment position is necessary. Furthermore, when operating in the loosening position, users may over-tighten the laces, sometimes requiring multiple switching positions to achieve the most comfortable fit. This time-consuming and inconvenient fine-tuning negatively impacts the user experience. Utility Model Content

[0003] This invention addresses the problems of inconvenient operation and difficulty in precise control of the tie adjustment in the existing technology by providing a tie adjustment device that facilitates the tightening and loosening of the tie, as well as an item with a tie adjustment device.

[0004] The belt adjustment device provided by this utility model includes:

[0005] A housing having a hollow inner cavity;

[0006] A winding assembly located within the hollow inner cavity;

[0007] A coupling component, which is engageably connected to the winding assembly;

[0008] The base plate assembly, the winding assembly is movably mounted on the base plate assembly, and the connecting assembly, the winding assembly and the base plate assembly are arranged sequentially along the first axial direction;

[0009] A rotary drive assembly is movably connected to the housing and can rotate relative to the housing. The rotary drive assembly is linked to the connecting assembly. When the connecting assembly and the winding assembly are engaged, the rotary drive assembly can drive the connecting assembly to rotate relative to the housing in a first direction, and the connecting assembly drives the winding assembly to rotate to tighten the strap.

[0010] When the connecting component and the winding component are in an engaged state, the rotary drive component can drive the connecting component to rotate relative to the housing in a second direction opposite to the first direction, and the connecting component drives the winding component to move along the first axial direction and press against the base plate component until the connecting component and the winding component disengage from the engaged state, and the base plate component drives the winding component to re-engage with the connecting component.

[0011] In some embodiments, the base plate assembly includes an elastic portion, the connecting assembly includes a first engagement tooth, and the winding assembly includes a second engagement tooth. The connecting assembly and the winding assembly engage or disengage through the first engagement tooth and the second engagement tooth. The elastic portion is configured to have an elastically compressible distance ≥ H in the first axial direction, where H is the height at which the two tooth surfaces of the first engagement tooth and the second engagement tooth overlap axially in the first axial direction when they are in engagement.

[0012] In some embodiments, the base plate assembly includes a first base and a cantilever tongue, the cantilever tongue including a fixed end and a free end, the fixed end of the cantilever tongue being connected to the first base, and the free end of the cantilever tongue being offset from the first base in a direction opposite to the first axial direction.

[0013] In some embodiments, the connecting component includes a first engagement tooth, and the winding component includes a second engagement tooth. The connecting component and the winding component engage or disengage through the first engagement tooth and the second engagement tooth. The axial distance between the vertex of the free end of the cantilever tongue and the first base is ≥H, where H is the height at which the two tooth surfaces overlap axially in the first axial direction when the first engagement tooth and the second engagement tooth are in the engaging state.

[0014] In some embodiments, there are multiple cantilever tongues, which are arranged symmetrically around the central axis of the base plate assembly.

[0015] In some embodiments, the cantilever tongue is integrally formed with the first base.

[0016] In some embodiments, the fixed end of the cantilever tongue is detachably connected to the first base.

[0017] In some embodiments, 1 mm ≤ H ≤ 2 mm.

[0018] In some embodiments, the elastic portion includes one or more of a spring, a plastic spring, and a metal spring.

[0019] In some embodiments, a stop pin is fixedly provided at the central axis position of the base plate assembly, the winding assembly has a through hole, the stop pin passes through the through hole and extends to the connecting assembly, and is used to cooperate with the connecting assembly to control gear switching.

[0020] In some embodiments, the base plate assembly includes a snap-fit ​​portion, and the housing has a snap-fit ​​groove, wherein the snap-fit ​​portion engages with the snap-fit ​​groove.

[0021] In some embodiments, the coupling assembly includes an elastic arm that can produce radial elastic deformation or radial displacement when the rotation drive assembly causes the coupling assembly to rotate relative to the housing in the second direction.

[0022] In some embodiments, the rotary drive assembly is provided with a rib, and the elastic arm is disposed opposite to the rib in an adjacent area. The side of the elastic arm facing the rib is provided with a protrusion. When the rotary drive assembly drives the connecting assembly to rotate relative to the housing in the second direction, the rib can press against the protrusion to cause the elastic arm to undergo radial elastic deformation.

[0023] In some embodiments, the rotary drive assembly is provided with a guide protrusion, the connecting assembly is provided with a guide groove, and the guide protrusion can be snapped into the guide groove and slide in cooperation with the guide groove.

[0024] This utility model provides an article with a strap adjustment device, including a strap adjustment device as described above that is installed on the article.

[0025] The tie adjustment device provided in this embodiment of the utility model uses the linkage between the rotary drive component and the connecting component, and provides the axial movement space for the winding component by setting the base plate component. This allows the user to rotate the rotary drive component in the opposite direction of the tie tightening direction without switching operating gears, and drive the winding component to move through the connecting component until the connecting component and the winding component disengage from the meshing state. This allows for a slight release of the tie, making the user's operation more convenient and facilitating fine adjustment of the tie.

[0026] Additional aspects and advantages of embodiments of the present invention will be set forth in the description which follows, and in part will be obvious from the description or may be learned by practice of embodiments of the present invention. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments of this utility model will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, and these are all within the protection scope of this utility model.

[0028] Figure 1 This is an exploded structural diagram of the tether adjustment device according to an embodiment of the present invention;

[0029] Figure 2 yes Figure 1 An exploded view of the tether adjustment device shown.

[0030] Figure 3A and Figure 3B yes Figure 1 A schematic diagram of the base plate assembly of the belt adjustment device is shown.

[0031] Figure 4 yes Figure 1 A schematic diagram of the housing of the belt adjustment device is shown.

[0032] Figure 5A and Figure 5B yes Figure 1 A schematic diagram of the connecting assembly of the belt adjustment device is shown.

[0033] Figure 6 yes Figure 1 A schematic diagram of the assembly of the connecting components and housing of the belt adjustment device shown (top view after removing the housing).

[0034] Figure 7 yes Figure 1 The diagram shows the structure of the rotary drive assembly in the belt adjustment device.

[0035] Figure 8A yes Figure 1 The diagram shows the motion of the drive assembly, connecting assembly, and housing gear ring of the belt adjustment device in its natural state when the belt is in the tightening operation position (bottom view).

[0036] Figure 8B yes Figure 8A The diagram shows the motion state of the connecting component and the meshing teeth of the winding component in the indicated motion state.

[0037] Figure 8C yes Figure 8A The diagram shows the motion state of the winding assembly and the base plate assembly corresponding to the shown motion state.

[0038] Figure 9A yes Figure 1The diagram shows the motion state of the rotary drive assembly, connecting assembly, and housing gear ring during the rotation of the rotary drive assembly in the second direction when the belt adjustment device is in the belt tightening operation position (bottom view).

[0039] Figure 9B yes Figure 9A The diagram shows the motion state of the connecting component and the meshing teeth of the winding component in the indicated motion state.

[0040] Figure 9C yes Figure 9A The diagram shows the motion state of the winding assembly and the base plate assembly corresponding to the shown motion state.

[0041] Figure 10A yes Figure 1 The diagram shows the motion of the rotary drive assembly, connecting assembly, and housing gear ring during the process of the rotary drive assembly rotating in the second direction to reach the critical point position and then re-engaging with the next tooth when the belt adjustment device is in the belt tightening operation position.

[0042] Figure 10B yes Figure 10A The diagram shows the motion state of the connecting component and the meshing teeth of the winding component in the indicated motion state.

[0043] Figure 10C yes Figure 10A The diagram shows the motion state of the winding assembly and the base plate assembly corresponding to the shown motion state.

[0044] Figure 11A yes Figure 1 The diagram shows the motion of the rotary drive assembly, connecting assembly, and housing gear ring at the moment when the pawl re-engages with the next tooth during the tightening operation of the belt adjustment device.

[0045] Figure 11B yes Figure 11A The diagram shows the motion state of the connecting component and the meshing teeth of the winding component in the indicated state.

[0046] Figure 11C yes Figure 11A The diagram shows the motion state of the winding assembly and the base plate assembly in the indicated state.

[0047] Figure 11D This is a schematic diagram showing the motion state of the connecting component and the winding component after they re-engage and return to their natural state at the meshing teeth.

[0048] Figure 11E This is a schematic diagram of the motion state of the winding assembly and base plate assembly after the connecting assembly and winding assembly have re-engaged and returned to their natural state.

[0049] Figure 12 yes Figure 1 The diagram shows the three-dimensional structure of the belt adjustment device.

[0050] Explanation of icon numbers:

[0051] 100-Lace adjustment device, 110-Housing, 111-Hollow inner cavity, 112-Slot, 1122-Limiting groove, 113-First annular ridge, 114-Gear ring, 1141-Gear groove, 1142-First ratchet surface, 1143-Second ratchet surface, 1144-Third ratchet surface, 1145-Fourth ratchet surface, 1146-First ratchet groove, 1147-Second ratchet groove, 120-Connecting assembly, 121-First meshing tooth, 1211-First tooth, 12111-First tooth surface, 12112-Second tooth surface, 122-Elastic arm, pawl, 1221-Protrusion, 12211-Abutting surface, 1222-Outer surface, 1223-Pawl end, 12231-Top surface, 123-Guide groove, 124-Second base, 12 5-Connecting part, 126-Second ring ridge, 127-Shaft hole, 130-Winding assembly, 131-Second engagement tooth, 1311-Second tooth, 13111-Third tooth surface, 1313-First engagement tooth groove, 13131-First groove wall, 132-Through hole, 133-Third base, 134-Annular disc, 135-Groove, 140-Base plate assembly, 141-Elastic part, cantilever tongue, 1411-Fixed end, 1412-Free end, 142-First base, 143-Stop pin, 144-Snap-fit ​​part, 1442-Limiting tooth, 1431-Gear control part, 150-Rotary drive assembly, 151-Rib, 1511-Rib end, 1512-Side wall, 1513-End face, 152-Guide protrusion, 160-Base Detailed Implementation

[0052] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein the same or similar reference numerals denote the same or similar parts or parts having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0053] It should be understood that the terms "upper", "lower", "left", "right", "front", "back", "length", "width", "horizontal", "vertical", "top", "bottom", "inner", and "outer" used in the description of this utility model to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are intended to facilitate the description of this utility model and simplify the description, and should not be construed as a limitation that the device or component referred to must have a specific orientation or positional relationship.

[0054] Furthermore, the terms "first" and "second" are used solely for distinguishing purposes and do not imply relative importance, nor do they indicate or suggest the number of technical features. Therefore, a feature defined by "first" or "second" may explicitly or implicitly indicate that there is one or more of that feature. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly defined.

[0055] Unless otherwise expressly specified, the terms "connection" and "fixation" in this utility model should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integrally formed connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0056] The following description, in conjunction with the accompanying drawings and specific embodiments, details an embodiment of the present invention for adjusting the tightening and loosening of a strap, and an article comprising the same.

[0057] Please see Figure 1 and Figure 2 The strap adjustment device 100 provided in this embodiment includes a housing 110, a connecting assembly 120, a winding assembly 130, a base plate assembly 140, a rotary drive assembly 150, and a base 160. The housing 110 has a hollow inner cavity 111. The winding assembly 130 is movably mounted on the base plate assembly 140 and housed within the hollow inner cavity 111. The connecting assembly 120 and the winding assembly 130 are interlocking. The connecting assembly 120, the winding assembly 130, and the base plate assembly 140 are arranged sequentially along a first axial direction. The first axial direction is the direction along the central axis of the strap adjustment device 100 from the connecting assembly 120 toward the base plate assembly 140. In this embodiment, the first axial direction is as follows: Figure 1 As shown in the diagram, direction A1, the second axial direction is the opposite of the first axial direction, i.e., as... Figure 1 The direction shown is A2. The rotary drive assembly 150 and the connecting assembly 120 are linked together. The rotary drive assembly 150 is also movably fastened to the housing 110. The rotary drive assembly 150 can drive the connecting assembly 120 to rotate relative to the housing 110. The housing 110 can be fixed to the base 160 by a snap-fit ​​structure. The housing 110 is equivalent to the stator of the strap adjustment device 100. The base 160 can be fixed to shoes, hats, clothes, bags, etc. by adhesive, sewing, or other means. The straps of the items can be connected to the winding assembly 130. The tightening and loosening of the straps can be adjusted by rotating the winding assembly 130.

[0058] When the connecting assembly 120 and the winding assembly 130 are engaged, the rotary drive assembly 150 can drive the connecting assembly 120 to rotate relative to the housing 110 in a first direction. At the same time, the connecting assembly 120 drives the winding assembly 130 to rotate in the strap tightening direction to wind and tighten the strap. The rotary drive assembly 150 and the connecting assembly 120 are also configured such that when the connecting assembly 120 and the winding assembly 130 are engaged, the rotary drive assembly 150 can drive the connecting assembly 120 to rotate relative to the housing 110 in a second direction opposite to the first direction. At the same time, the connecting assembly 120 drives the winding assembly 130 to move in the first axial direction and press against the base plate assembly 140 until the connecting assembly 120 and the winding assembly 130 disengage from the engagement state, and the base plate assembly 140 drives the winding assembly 130 to re-engage with the connecting assembly 120.

[0059] It should be noted that when the rotary drive assembly 150 drives the connecting assembly 120 to rotate relative to the housing 110 in the first direction, and simultaneously the connecting assembly 120 drives the winding assembly 130 to rotate in the strap tightening direction to tighten the strap, the direction of the strap tightening rotation of the winding assembly 130 may be the same as or opposite to the first direction. This is related to the meshing motion direction of the connecting assembly 120 driving the winding assembly 130, but the working principle is the same. In this embodiment, for the sake of simplification and understanding, the example of the winding assembly 130's strap tightening rotation being the same as the first direction is used for illustration. It can be understood that the direction of the winding assembly 130's strap loosening rotation is opposite to the direction of the strap tightening rotation. In this embodiment, the direction of the winding assembly 130's strap loosening rotation is the second direction, and the first direction is as follows: Figure 1 The second direction is as shown in the diagram. Figure 1 The D2 direction is shown.

[0060] In this embodiment, the winding assembly 130 includes a third base 133 and an annular disc 134. Both the third base 133 and the annular disc 134 have through holes. The third base 133 and the annular disc 134 are connected by a connecting post (not shown in the figure), so that the winding assembly 130 forms a through hole 132 in the central axis direction, and a groove 135 is formed between the third base 133, the connecting post, and the annular disc 134. The groove 135 is used to accommodate the strap. When the strap adjustment device 100 is installed on the item and the item's strap is connected, the end of the strap (not shown in the figure) can be engaged with the connecting post of the winding assembly 130, so that the strap can be tightened and loosened by rotating the winding assembly 130.

[0061] Please refer to the following: Figure 3AA stop pin 143 extending along a second axial direction is fixedly installed at the central axis position of the base plate assembly 140. The stop pin 143 passes through the through hole 132 of the winding assembly 130, so that the winding assembly 130 is movably mounted on the base plate assembly 140. The base plate assembly 140 can be fixedly connected to the housing 110 through a snap-fit ​​structure, and the winding assembly 130 is housed in the hollow inner cavity 111 of the housing 110.

[0062] Please combine them together Figure 3A and Figure 4 The base plate assembly 140 is fixedly connected to the housing 110 via a snap-fit ​​structure. Specifically, the base plate assembly 140 includes a snap-fit ​​portion 144, and the housing 110 has a snap-fit ​​groove 112. The snap-fit ​​portion 144 of the base plate assembly 140 can engage with the snap-fit ​​groove 112 of the housing 110, thereby fixing the base plate assembly 140 to the housing 110. Specifically, the snap-fit ​​portion 144 of the base plate assembly 140 is configured to protrude radially outward from the periphery of the first base 142 and extend along the second axial direction. The snap-fit ​​groove 112 of the housing 110 is formed on the side wall of the housing 110. Furthermore, the top of the snap-fit ​​portion 144 is also provided with an inwardly facing snap-fit ​​flange, which can be embedded in the snap-fit ​​groove 112. Through the snap-fit ​​connection between the snap-fit ​​portion 144 and the snap-fit ​​groove 112, the base plate assembly 140 is fixedly connected to the housing 110. In addition, the base plate assembly 140 is provided with limiting teeth 1442 protruding from the periphery of the first base 142, and the lower periphery of the housing 110 is provided with limiting grooves 1122. The limiting teeth 1442 can be embedded into the limiting grooves 1122 to achieve a limiting effect, making the connection between the base plate assembly 140 and the housing 110 more stable. Understandably, multiple snap-fit ​​portions 144 and limiting teeth 1442 can be provided in the base plate assembly 140, and multiple snap-fit ​​grooves 112 and limiting grooves 1122 can also be provided in the housing 110. Through multiple sets of axial locking and radial limiting, the base plate assembly 140 can be more firmly fixedly connected to the housing 110. Furthermore, the thickness of the limiting tooth 1442 of the base plate assembly 140 is the same as the thickness of the first base 142, and the height of the limiting groove 1122 opened in the housing 110 in the axial direction is the same as the thickness of the limiting tooth 1442. As a result, when the base plate assembly 140 and the housing 110 are fastened and locked, the bottom surface of the base plate assembly 140 and the bottom surface of the housing 110 are basically coincident on the same plane, making the overall structure more compact and the bottom appearance flat without steps.

[0063] Please see Figure 4The inner wall of the outer shell 110 is provided with a first annular ridge 113, which divides the hollow inner cavity 111 into an upper chamber and a lower chamber along the first axial direction. The diameter of the central hole of the first annular ridge 113 is smaller than the outer diameter of the annular disc 134 of the winding assembly 130. When the winding assembly 130 is mounted on the base plate assembly 140 and the base plate assembly 140 is fastened to the outer shell 110, the winding assembly 130 is placed in the lower chamber of the hollow inner cavity 111 of the outer shell 110 and cannot pass through the central hole of the first annular ridge 113 to reach the upper chamber. This limits the axial movement of the winding assembly 130 and increases the stability of the winding assembly 130 during rotation.

[0064] Please see Figures 1 to 5B The connecting assembly 120 may be partially or entirely arranged in the upper chamber of the hollow inner cavity 111 and placed on the winding assembly 130. The connecting assembly 120 also cooperates with the retaining pin 143 of the base plate assembly 140 to control gear switching. Specifically, the connecting assembly 120 has a through shaft hole 127 along the axial direction, and the retaining pin 143 of the base plate assembly 140 can pass through the through hole 132 of the winding assembly 130 and extend to the shaft hole 127 of the connecting assembly 120. The inner peripheral wall of the shaft hole 127 is provided with a second annular ridge 126, which can cooperate with the retaining pin 143 of the base plate assembly 140 to control the engagement and disengagement of the connecting assembly 120 and the winding assembly 130, thereby enabling the belt adjustment device 100 to switch gears in the axial direction, and can be divided into a first operating gear and a second operating gear. The stop control part 1431 at the free end of the stop pin 143 is an elastic part. When the stop control part 1431 passes through the second annular ridge 126 of the connecting assembly 120 along the second axial direction and is engaged at the upper end of the second annular ridge 126, the connecting assembly 120 and the winding assembly 130 will be engaged. The connecting assembly 120 can drive the winding assembly 130 to move in conjunction. At this time, it is the first operating position of the belt adjustment device 100, that is, the belt tightening operating position. When the stop control part 1431 at the free end of the stop pin 143 is retracted under the second annular ridge 126 of the connecting assembly 120, the connecting assembly 120 and the winding assembly 130 are disengaged. The winding assembly 130 can be disengaged from the linkage of the connecting assembly 120. At this time, it is the second operating position of the belt adjustment device 100, that is, the belt loosening operating position.

[0065] Furthermore, after the rotary drive assembly 150 is engaged with the housing 110, it can not only rotate relative to the housing 110, but also move up and down relative to the housing 110 in the axial direction. Simultaneously, the rotary drive assembly 150 is linked to the connecting assembly 120. When the rotary drive assembly 150 is pulled upwards in the second axial direction, it simultaneously drives the connecting assembly 120 to move in the second axial direction, causing the second annular ridge 126 of the connecting assembly 120 to be positioned above the stop control part 1431 of the stop pin 143. The connecting assembly 120 and the winding assembly 130 are in a disengaged state, and the winding assembly 130 can disengage from the linkage of the connecting assembly 120, i.e., the belt adjustment device 100 is in the second operating position. If the winding assembly 130 is subjected to the tension of the belt at this time, the winding assembly 130 can rotate in the second direction to loosen the belt. When the rotary drive assembly 150 is pressed downward along the first axial direction, it simultaneously drives the connecting assembly 120 to move along the first axial direction, placing the second annular ridge 126 of the connecting assembly 120 under the stop control part 1431 of the stop pin 143. This engages the connecting assembly 120 and the winding assembly 130, allowing the connecting assembly 120 to drive the winding assembly 130 to move. At this time, the belt adjustment device 100 is in the first operating position. If the rotary drive assembly 150 is rotated relative to the housing 110 along the first direction, the rotary drive assembly 150 will link with the connecting assembly 120, and the connecting assembly 120 will drive the winding assembly 130 to rotate along the first direction, thus winding and tightening the belt. By providing the stop pin 143 on the base assembly 140 to cooperate with the connecting assembly 120, and through the linkage between the rotary drive assembly 150 and the connecting assembly 120, the two operating positions of the belt adjustment device 100 can be switched by lifting and pressing the rotary drive assembly 150.

[0066] Please see Figures 4 to 6 The upper end face of the first annular ridge 113 of the housing 110 is also provided with a toothed ring 114 that circumferentially rotates around the circumference. The tooth profile of the toothed ring 114 is axially symmetrical triangular teeth. The connecting assembly 120 includes a second base 124, a connecting portion 125, and an elastic arm 122. The elastic arm 122 is fixedly connected to the second base 124 through the connecting portion 125. The elastic arm 122 can engage or disengage with the toothed ring 114, thereby controlling the engagement and disengagement of the connecting assembly 120 and the housing 110, and thus controlling the rotational movement of the connecting assembly 120 and the rotary drive assembly 150 relative to the housing 110. Specifically, in this embodiment, the elastic arm 122 can be configured as a pawl, and the pawl 122 can engage or disengage with the toothed ring 114. Under normal circumstances, please refer to Figure 6 To better demonstrate and illustrate the assembly relationship and interaction between the connecting component 120 and the housing 110, Figure 6The image shows a top view of the connecting assembly 120 and the housing 110 after removing the rotary drive assembly 150. The pawl end 1223 of the pawl 122 engages with the tooth groove 1141 of the gear ring 114. When a rotational force along the first direction is applied to the connecting assembly 120, the pawl 122 has a certain elasticity, and the pawl end 1223 can slide from the tooth groove 1141 of the gear ring 114 and jump into the next tooth groove. By continuously applying a rotational force along the first direction, the pawl 122 can form a periodic cycle of engagement-sliding-tooth skipping, realizing the rotation of the connecting assembly 120 within the gear ring 114 along the first direction. It can be understood that if the rotary drive assembly 150 is fixedly connected to the connecting assembly 120, rotating the rotary drive assembly 150 along the first direction can cause the rotary drive assembly 150 to drive the connecting assembly 120 to rotate within the gear ring 114 along the first direction. Furthermore, if the connecting assembly 120 has no external rotary drive assembly 150, but only... Figure 6 In the example structure where the pawl 122 and the toothed ring 114 engage, if a rotational force along the second direction is applied to the connecting component 120, the end 1223 of the pawl will press against the tooth surface of the toothed groove 1141 and will not move. This means that under this simple structure where the pawl 122 and the toothed ring 114 engage, the connecting component 120 can only rotate unidirectionally in the first direction and cannot rotate in the opposite direction in the second direction.

[0067] Please refer to the following: Figures 5A to 8A In order to better demonstrate and illustrate the assembly and actuation relationship of the rotary drive assembly 150, the connecting assembly 120, and the gear ring of the housing 110, Figure 8A The diagram shown is a schematic representation of the assembly relationship between the gear ring, connecting assembly 120, and rotary drive assembly 150 of the housing 110 in its natural state when the belt adjustment device 100 is in the belt tightening operation position, omitting the base plate assembly 140, cable winding assembly 130, and other parts of the housing 110. This is a bottom-view diagram showing the assembly relationship between the gear ring, connecting assembly 120, and rotary drive assembly 150 of the housing 110. In this bottom-view perspective, the second direction is as shown... Figure 8AThe direction is shown in D2. A guide protrusion 152 is provided on the inner bottom surface of the rotary drive assembly 150 facing the connecting assembly 120. The connecting assembly 120 also has a guide groove 123, and the guide protrusion 152 is fastened within the guide groove 123 and slides in cooperation with it. Specifically, the guide protrusion 152 and the guide groove 123 are correspondingly arranged. The top of the guide protrusion 152 has a flange that can be embedded in the guide groove 123, making the connection between the connecting assembly 120 and the rotary drive assembly 150 more stable and less prone to detachment. The guide groove 123 is arc-shaped, and the arc length of the arc section is greater than the length of the guide protrusion 152, allowing the guide protrusion 152 to slide along the guide groove 123 after being fastened, thereby allowing the connecting assembly 120 and the rotary drive assembly 150 to slide relative to each other. Meanwhile, through the fastening connection of the guide protrusion 152 and the guide groove 123, when the rotary drive assembly 150 is pulled upward along the second axis and pressed downward along the first axis, it can simultaneously drive the axial movement of the connecting assembly 120. This allows the positional relationship between the base plate assembly 140 stop pin 143 and the second ring ridge 126 of the linkage assembly 120 to be controlled by the pulling and pressing of the rotary drive assembly 150, thereby controlling the engagement and disengagement of the connecting assembly 120 and the winding assembly 130, i.e., controlling the switching of the operating gear of the belt adjustment device 100.

[0068] In this embodiment, the guide groove 123 is formed on the outer end side of the second base 124, and the guide protrusion 152 and guide groove 123 are configured in three pairs. This ensures connection stability while making the structural design of the connecting component 120 and the structural arrangement of the inner bottom surface of the rotary drive component 150 more compact. It is understood that in other embodiments, the number of guide protrusions 152 and guide grooves 123 can be one or more, and the guide groove 123 can also be formed in the second base 124.

[0069] In this embodiment, the elastic arm 122 of the connecting assembly 120 is further configured such that when the rotary drive assembly 150 drives the connecting assembly 120 to rotate relative to the housing 110 in a second direction, the rotary drive assembly 150 can drive the elastic arm 122 to produce radial elastic deformation or radial displacement. Specifically, a rib 151 is also provided on the inner bottom surface of the rotary drive assembly 150 facing the connecting assembly 120. The rib 151 corresponds one-to-one with the elastic arm 122 of the connecting assembly 120 and is arranged opposite to each other in adjacent areas. The rib 151 is provided on the side of the corresponding elastic arm 122 away from the outer side 1222 of the second base 124. The elastic arm 122 has a protrusion 1221 on the outer side 1222 facing the rib 151. When the rotary drive assembly 150 rotates in the second direction, the protrusion 1221 can be pressed by the rib 151, causing the elastic arm 122 to produce radial inward elastic deformation or radial displacement. Specifically, the rib 151 extends from near the connecting portion 125 toward the protrusion 1221 and is correspondingly arranged roughly along the contour of the outer surface 1222 of the elastic arm 122, and the end face 1513 of the rib 151 extends from the side wall 1512 as an inclined surface. The angle between the abutting surface 12211 of the protrusion 1221 and the outer surface 1222 near the connecting portion 125 is an obtuse angle, and the abutting surface 12211 is arranged as an inclined surface and corresponds to the contour of the end face 1512. In the normal state, the side wall 1512 of the rib 151 is close to or in contact with the outer surface 1222 of the elastic arm 122. When the rotary drive assembly 150 rotates in the second direction, the guide protrusion 152 slides along the guide groove 123, and the end face 1513 of the rib 151 presses against the abutment surface 12211 of the protrusion 1221 of the elastic arm 122. As the rotary drive assembly 150 rotates further, the end face 1513 presses against and slides further on the abutment surface 12211, while the elastic arm 122 generates radially inward elastic contraction and gradually leaves the current tooth groove. When the end of the elastic arm 122 is displaced to the end position of the tooth groove, in this embodiment, that is, when the pawl end 128 of the pawl 122 slides to the vertex where the two teeth intersect in the tooth groove, the end of the elastic arm 122 disengages from the current tooth groove and jumps into the next tooth groove under the action of the rebound force. By continuously rotating the drive assembly 150 in the second direction, the end of the elastic arm 122 can repeatedly engage, disengage, and jump into the next tooth groove, thereby enabling the rotation drive assembly 150 and the connecting assembly 120 to rotate relative to the housing 110 in the second direction.

[0070] Please refer to the following: Figure 1 , Figure 2 and Figure 8BThe connecting component 120 has a first engagement tooth 121 on its end face facing the winding component 130, and the winding component 130 has a second engagement tooth 131 formed along the inner circumferential surface of the annular disc 134. The first engagement tooth 121 and the second engagement tooth 131 can be engaged and connected. The connecting component 120 and the winding component 130 are engaged or disengaged through the first engagement tooth 121 and the second engagement tooth 131. Furthermore, the first engagement tooth 121 and the second engagement tooth 131 enable the connecting component 120 to move in conjunction with the winding component 130. When the first engagement tooth 121 and the second engagement tooth 131 are engaged, that is, when the connecting component 120 and the winding component 130 are in an engaged state, the connecting component 120 can act as an active component to drive the winding component 130 to move. When the first engagement tooth 121 and the second engagement tooth 131 disengage, that is, when the connecting assembly 120 and the winding assembly 130 are in a disengaged state, the winding assembly 130 is disengaged from the linkage of the connecting assembly 120. In this embodiment, when the connecting assembly 120 and the winding assembly 130 are engaged, the engagement direction of the two teeth can be as follows: Figure 8B As shown, Figure 8B A schematic diagram of the assembly relationship of the first meshing tooth 121 and the second meshing tooth 131 in the meshing state is shown. Specifically, the tooth surfaces of the first meshing tooth 121 and the second meshing tooth 131 are obliquely arranged relative to the central axis, and the angle formed by the normal of the first tooth surface 12111 of the first tooth of the first meshing tooth 121 and the axial line is an acute angle. Therefore, when the rotary drive assembly 150 drives the connecting assembly 120 to rotate relative to the housing 110 in the first direction, the connecting assembly 120 will drive the winding assembly 130 to rotate in the first direction. Taking the interaction and movement of the first tooth 1211 of the first engagement tooth 121 and the second tooth 1311 of the second engagement tooth 131 as an example, in the initial state, the first tooth 1211 is in the first engagement tooth groove 1313 of the winding assembly 130. When the connecting assembly 120 rotates in the first direction, the first tooth 1211 will press against the first groove wall 13131 of the first engagement tooth groove 1313, and apply a horizontal and upward thrust to the first groove wall 13131, thereby driving the winding assembly 130 to rotate in the first direction and thus tightening the strap.

[0071] Please see Figure 3A , 3B and Figures 8A to 11E In order to better demonstrate and illustrate the actuation relationship of the rotary drive assembly 150, the connecting assembly 120, and the gear ring of the housing 110 under different motion states, Figure 8A , 9AFigures 10A and 11A show schematic diagrams of the motion relationship between the gear ring of the housing 110, the connecting assembly 120, and the rotary drive assembly 150 from a bottom-view perspective, omitting the base plate assembly 140, the winding assembly 130, and other parts of the housing 110 under different motion states. In this bottom-view perspective, the second direction is the direction shown as D2 in the figure. In this embodiment, when the connecting assembly 120 and the winding assembly 130 are engaged, the rotary drive assembly 150 drives the connecting assembly 120 to rotate relative to the housing 110 in the second direction. The connecting assembly 120 drives the winding assembly 130 to move along the first axial direction and press against the base plate assembly 140 until the connecting assembly 120 and the winding assembly 130 disengage from the engaged state, and the base plate assembly 140 drives the winding assembly 130 to re-engage with the connecting assembly 120. Specifically, the first tooth 1211 presses against the third tooth surface 13111 of the second tooth 1311, applying a horizontal downward thrust to the third tooth surface 13111. This thrust can be decomposed into a force acting on the winding assembly 130 along the first axial direction. This force further drives the winding assembly 130 to press against the base plate assembly 140 and is transmitted to the base plate assembly 140. The base plate assembly 140 also includes an elastic portion 141, which is configured to generate elastic compression in the first axial direction when subjected to the pressing force from the winding assembly 130, allowing the winding assembly 130 to have movement space in the first axial direction and thus generate displacement in the first axial direction. If the rotary drive assembly 150 continues to rotate in the second direction, the winding assembly 130 is displaced in the first axial direction due to the thrust from the connecting assembly 120. The second tooth 1311 and the first tooth 1211 will gradually slide. When the tips of the second tooth 131 and the first tooth 121 overlap, the first engagement tooth 121 and the second engagement tooth 131 disengage from the meshing state, that is, the connecting assembly 120 and the winding assembly 130 disengage from the meshing state. At the same time, the displacement of the winding assembly 130 in the first axial direction caused by the push of the connecting assembly 120 reaches its maximum value, and the elastic compression of the elastic part 141 in the first axial direction due to the pressure of the winding assembly 130 also reaches its maximum value. At the moment when the first engagement tooth 121 and the second engagement tooth 131 disengage, if the tie or the tie itself has sufficient tension, the tension applied by the tie to the winding assembly 130 can cause the winding assembly 130 to rotate in the second direction, thereby releasing the tie. After the elastic part 141 is elastically compressed, it will generate a rebound force in the second axial direction. After the first biting tooth 121 and the second biting tooth 131 disengage, the winding assembly 130 will move along the second axial direction under the action of the rebound force of the elastic part 141, so that the first biting tooth 121 and the second biting tooth 131 will quickly re-enter the meshing state, that is, the base plate assembly 140 drives the winding assembly 130 to re-mesh with the connecting assembly 120.

[0072] Because the elastic portion 141 is provided on the base plate 140 and is configured to provide axial elasticity, when the connecting assembly 120 and the winding assembly 130 are in an engaged state and the winding assembly 130 is subjected to a force from the connecting assembly 120 in the first axial direction, the elastic portion 141 provides the winding assembly 130 with a movement space that can generate displacement in the first axial direction, so that the connecting assembly 120 and the winding assembly 130 can gradually separate from the engaged state until they become disengaged, and through the rebound force of the elastic portion 141, the connecting assembly 120 and the winding assembly 130 can quickly re-enter the engaged state from the disengaged state. At the instant the connecting assembly 120 and the winding assembly 130 disengage, the winding assembly 130 can be pulled by the tie and rotated in the second direction to release the tie. However, due to the rebound force of the elastic part 141, the winding assembly 130 quickly re-engages with the connecting assembly 120, and the winding assembly 130 stops rotating in the second direction, thus stopping the release of the tie. Therefore, the amount of tie release is very small, allowing for fine adjustment of the tie length. Of course, the rotation drive assembly 150 can be continuously rotated in the second direction to make the connecting assembly 120 and the winding assembly 130 repeat the engagement-disengagement-engagement cycle. Each time from engagement to disengagement, the winding assembly 130 can release a small amount of tie under the action of the tie tension, allowing the user to make multiple fine adjustments to the tie to achieve the most comfortable state.

[0073] In this embodiment, in order to provide sufficient axial displacement space for the winding assembly 130 from engagement of the first engagement tooth 121 and the second engagement tooth 131 to disengagement, the elastic portion 141 is configured to provide axial elasticity and has an elastically compressible distance ≥ H in the first axial direction. (See also...) Figure 8B H is the height at which the first biting tooth 121 and the second biting tooth 131 overlap axially in the first axial direction when they are in the meshing state.

[0074] Specifically, please refer to Figure 3A and 3BThe elastic part 141 is constructed as a cantilever tongue, which includes a fixed end 1411 and a free end 1412. The fixed end 1411 of the cantilever tongue 141 is connected to the first base 142, and the free end 1412 of the cantilever tongue 141 is tilted off the first base 142 along the second axial direction. The axial distance B between the vertex of the free end 1412 and the first base 142 is B, where B ≥ H, that is, B must be greater than or equal to the height at which the first biting teeth 121 and the second biting teeth 131 are axially coincident in the first axial direction when they are in the meshing state. In this embodiment, considering the compactness of the overall structure of the tether adjustment device 100, the range of H is set to 1 mm ≤ H ≤ 2 mm. In this embodiment, there are four cantilever tongues 141, which are symmetrically arranged around the central axis of the base plate assembly 142. The cantilever tongues 141 and the first base 140 can be integrally formed.

[0075] In other embodiments, the elastic part 141 may also be one or more elastic materials such as springs, elastic plastic sheets, and elastic silicone sheets. The number of cantilever tongues 141 may also be other numbers. The fixed end 1411 of the cantilever tongue 141 may be detachably connected to the first base 140. For example, the fixed end 1411 may be detachably snapped or fastened to the first base 140 to connect the cantilever tongue 141 to the first base 140.

[0076] The following combination Figures 8A to 11E The following is a detailed description of the motion state in which the belt adjustment device 100 is adjusted to the fastening operation position, i.e., the first operation position, and the connecting component 120 and the winding component 130 are engaged, and the rotating component 150 drives the connecting component 120 to rotate in the second direction, with each component moving in tandem.

[0077] Please see Figures 8A-8C By pressing and rotating the drive assembly 150, the connecting assembly 120 and the winding assembly 130 are engaged. When the drive assembly 150 is not rotated, it is in its natural state. The pawl end 1223 of the pawl 122 engages with the first ratchet groove 1146 of the gear ring 114. The first engagement tooth 121 of the connecting assembly 120 and the second engagement tooth 131 of the winding assembly 130 are engaged. The first tooth 1211 of the first engagement tooth 121 is located in the first engagement groove 1313. Furthermore, since the winding assembly is relatively light, the winding assembly 130 simply rests naturally on the cantilever tongue 141 of the base assembly 140. The force acting on the cantilever tongue 141 is very small, and the cantilever tongue 141 experiences only slight or essentially non-elastic axial elastic compression.

[0078] When the rotary drive assembly 150 is rotated in the second direction, the guide protrusion 152 of the rotary drive assembly 150 slides along the guide groove 123, and the end face 1513 of the rib 151 approaches and eventually presses against the abutment surface 12211 of the protrusion 1221 of the pawl 122. There is friction between the abutment surface 12211 and the end face 1513. When sufficient rotational force is applied to the rotary drive assembly 150, the force exerted by the end face 1513 on the abutment surface 12211 increases to overcome the friction, and the end face 1513 begins to slide along the abutment surface 12211. The force exerted by the end face 1513 on the abutment surface 12211 causes the pawl 122 to undergo radially inward elastic deformation, thereby causing the pawl 122 to form a radially inward displacement along the first ratchet surface 1142. When the end of the pawl 1223 reaches the intersection of the first ratchet surface 1142 and the fourth ratchet surface 1145, the displacement of the end of the pawl 1223 reaches the critical point. Figures 9A-9C The diagram shows the movement of each component when the pawl 122 reaches the critical position. Specifically, during the process of the pawl moving from the contact surface 12211 of the protrusion 1221 being pressed against the end face 1513 of the rib 151 to the critical position at the end 1223, the first engagement tooth 121 of the connecting component 120 and the second engagement tooth 131 of the winding component 130 remain engaged, with the first tooth 1211 of the first engagement tooth 121 still located in the first engagement tooth groove 1313. The winding component 130 remains naturally mounted on the cantilever tongue 141 of the base component 140.

[0079] After the displacement of the end of the pawl 122 reaches the critical point, the elastic restoring force of the pawl 122 will drive it to jump into the second ratchet groove 1147, and quickly abut against the third ratchet surface 1144 and the fourth ratchet surface 1145, thus re-entering the meshing state. The process of the pawl 122 jumping from the first ratchet groove 1146 into the second ratchet groove 1147 for re-engagement is actually also the process of the connecting assembly 120 starting to rotate in the second direction. From the critical point to complete engagement in the second ratchet groove 1147, the connecting assembly 120 rotates by one tooth angle. During the process from the critical point to complete re-engagement, the connecting assembly 120 will generate a thrust along the first axial direction on the winding assembly 130, pushing the winding assembly 130 to move along the first axial direction and press against the cantilever tongue 141 of the base plate assembly 140, causing the cantilever tongue 141 to undergo elastic compression. That is, the elastic compression of the cantilever tongue 141 provides movement space for the winding assembly 130 to move along the first axial direction.

[0080] Specifically, please refer to Figures 10A-10C , Figures 10A-10CThe diagram illustrates the motion of each component during the process of the pawl 122 re-engaging with the next tooth after reaching the critical position. During this process, as the pawl 122 re-engages with the next tooth after reaching the critical position, the connecting component 120 begins to rotate in the second direction. At this time, due to the engagement of the connecting component 120 and the winding component 130, the surfaces of the first and second engagement teeth 121 are in contact. The first engagement tooth 121 of the connecting component 120 exerts a horizontal radial thrust on the second engagement tooth 131 of the winding component 130, deviating from the first axial direction. A portion of this thrust is decomposed into a force driving the winding component 130 to move along the first axial direction. (See also...) Figure 10B Taking point P1 on the second tooth 1311 as an example, where the first tooth 1211 presses against the second tooth 1311, the first tooth 1211 will exert a pushing force F1 on the second tooth 1311. F1 can be decomposed into a force F along the first axial direction. 1a and radial force F 1b The force F acting along the first axial direction 1b The winding assembly 130 will be driven to move along the first axial direction, and the first tooth 1211 and the second tooth 1311 will slide. The winding assembly 130 will press against the cantilever tongue 141 of the base plate assembly 140, causing the cantilever tongue 141 to generate elastic compression along the first axial direction. Figures 10A-10C The diagram shows the state of each component during the rebound process of the pawl 122, but before it has fully engaged with the second ratchet groove 1147. At this time, the end 1223 of the pawl is partially in contact with the fourth ratchet surface 1145 but has not reached the third ratchet surface 1144. The first tooth 1211 and the second tooth 1311 have slipped but are still partially in contact. The cantilever tongue 141 of the base plate assembly 140 is partially compressed by the pressure of the winding assembly 130.

[0081] Please see Figure 11A-11E As the connecting assembly 120 continues to rotate in the second direction, the pawl 122 fully engages in the second ratchet groove 1147, that is, when the end 1223 of the pawl abuts against the third ratchet surface 1144 and the fourth ratchet surface 1145, the connecting assembly 120 pushes the winding assembly 130 to move to its maximum value in the first axial direction. At this time, the second tooth 1311 slides relative to the first tooth 1211 until the apex of the two teeth coincides, and the first biting tooth 121 and the second biting tooth 131 disengage from the engagement state, that is, the connecting assembly 120 and the winding assembly 130 disengage from the engagement state. At the same time, the elastic compression of the cantilever tongue 141 of the base plate assembly 140 caused by the pressure of the winding assembly 130 also reaches its maximum value.

[0082] If the tie is pulled or tightened sufficiently at this time, the tension of the tie will exert a force on the winding assembly 130 in the second direction, causing the winding assembly 130 to rotate and release in the second direction. Simultaneously, the compressed cantilever tongue 141 will exert a force on the winding assembly 130 in the second axial direction, driving the winding assembly 130 to move in the second axial direction. For details, please refer to... Figure 11B Taking point P2 on the second tooth 1311 as an example, P2 is subjected to the tension F2 of the tether, which can be decomposed into a force F along the first axial direction. 1a and the radial force F along the second direction 2b Simultaneously, the cable reel assembly 130 is also subjected to a rebound force F3 from the cantilever tongue 141. Under the combined action of the strap tension and the rebound force of the cantilever tongue 141, the cable reel assembly 130 is driven to rotate in the second direction and jump back to the first engagement tooth groove 1313. The cable reel assembly 130 and the connecting assembly 120 re-engage and return to their natural state. In fact, during this process, the cable reel assembly 130 rotates by one tooth angle in the second direction, causing the strap to release the length of the cable corresponding to that tooth rotation, thereby achieving the effect of controlling the release length of the strap and enabling fine adjustment of the strap. The above-mentioned linkage motion can be repeated in small cycles to release the strap multiple times, allowing the user to make fine adjustments to the strap.

[0083] Therefore, the strap adjustment device 100 provided in this embodiment of the present invention can, when in the strap tightening operation position, i.e., when the connecting component 120 and the winding component 130 are engaged, drive the rotating component 150 to rotate the connecting component 120 in the second direction to release a small amount of strap. The user can loosen the strap by rotating the rotating component 150 in the opposite direction of the strap tightening direction without switching the operating position of the strap adjustment device 100. This makes loosening the strap more convenient and allows for precise and minute adjustments to the amount of strap loosening, making it easier for the user to adjust the strap to the most comfortable state.

[0084] Figure 12 A perspective view of the assembled components of the strap adjustment device 100 is shown. This embodiment of the invention also provides an item with a strap adjustment device. The main body of the strap adjustment device 100 can be fixedly installed on the item to be tightened via a base 160, and the item can be tightened using the strap adjustment device 100. The item to be tightened can be shoes, clothing, hats, bags, or various types of bags, etc. The strap adjustment device 100, in conjunction with other components such as a strap guide, can tighten the strap. Furthermore, the strap adjustment device 100 of this embodiment allows for precise and minor strap loosening adjustment by rotating in the opposite direction to the tightening direction, without needing to adjust the operating position. Further details are omitted here.

[0085] Of course, the tightening direction of the strap adjustment device 100 provided by this utility model is not limited to the first direction. Even if the strap directions are different, the principle of realizing its function is the same. The corresponding structure can be changed according to the actual application requirements, and the same function and effect can be achieved in the end.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A strap adjustment device, characterized in that, include: A housing having a hollow inner cavity; A winding assembly located within the hollow inner cavity; A coupling component, which is engageably connected to the winding assembly; The base plate assembly, the winding assembly is movably mounted on the base plate assembly, and the connecting assembly, the winding assembly and the base plate assembly are arranged sequentially along the first axial direction; A rotary drive assembly is movably connected to the housing and can rotate relative to the housing. The rotary drive assembly is linked to the connecting assembly. When the connecting assembly and the winding assembly are engaged, the rotary drive assembly can drive the connecting assembly to rotate relative to the housing in a first direction, and the connecting assembly drives the winding assembly to rotate to tighten the strap. When the connecting component and the winding component are in an engaged state, the rotary drive component can drive the connecting component to rotate relative to the housing in a second direction opposite to the first direction, and the connecting component drives the winding component to move along the first axial direction and press against the base plate component until the connecting component and the winding component disengage from the engaged state, and the base plate component drives the winding component to re-engage with the connecting component.

2. The strap adjustment device according to claim 1, characterized in that, The base plate assembly includes an elastic portion, the connecting assembly includes a first engagement tooth, and the winding assembly includes a second engagement tooth. The connecting assembly and the winding assembly engage or disengage through the first engagement tooth and the second engagement tooth. The elastic portion is configured to have an elastically compressible distance ≥ H in the first axial direction, where H is the height at which the two tooth surfaces overlap axially in the first axial direction when the first engagement tooth and the second engagement tooth are in the engaging state.

3. The strap adjustment device according to claim 1, characterized in that, The base plate assembly includes a first base and a cantilever tongue. The cantilever tongue includes a fixed end and a free end. The fixed end of the cantilever tongue is connected to the first base, and the free end of the cantilever tongue is offset from the first base in a direction opposite to the first axial direction.

4. The strap adjustment device according to claim 3, characterized in that, The connecting component includes a first engagement tooth, and the winding component includes a second engagement tooth. The connecting component and the winding component engage or disengage through the first engagement tooth and the second engagement tooth. The axial distance between the vertex of the free end of the cantilever tongue and the first base is ≥H, where H is the height at which the two tooth surfaces overlap axially in the first axial direction when the first engagement tooth and the second engagement tooth are in the engaging state.

5. The strap adjustment device according to claim 3, characterized in that, There are multiple cantilever tongues, which are arranged symmetrically around the central axis of the base plate assembly.

6. The strap adjustment device according to claim 3, characterized in that, The cantilever tongue is integrally formed with the first base.

7. The strap adjustment device according to claim 3, characterized in that, The fixed end of the cantilever tongue is detachably connected to the first base.

8. The strap adjustment device according to claim 2 or 4, characterized in that, 1mm≤H≤2 mm.

9. The strap adjustment device according to claim 2, characterized in that, The elastic part includes one or more of springs, plastic springs, and metal springs.

10. The strap adjustment device according to claim 1, characterized in that, A stop pin is fixedly installed at the central axis position of the base plate assembly. The winding assembly has a through hole, and the stop pin passes through the through hole and extends to the connecting assembly for cooperating with the connecting assembly to control gear switching.

11. The strap adjustment device according to claim 1, characterized in that, The base plate assembly includes a snap-fit ​​part, and the housing has a snap-fit ​​groove, with the snap-fit ​​part engaging with the snap-fit ​​groove.

12. The strap adjustment device according to claim 1, characterized in that, The connecting assembly includes an elastic arm, which can generate radial elastic deformation or radial displacement when the rotation drive assembly drives the connecting assembly to rotate relative to the housing in the second direction.

13. The strap adjustment device according to claim 12, characterized in that, The rotary drive assembly is provided with a rib, and the elastic arm and the rib are arranged opposite to each other in an adjacent area. The side of the elastic arm facing the rib is provided with a protrusion. When the rotary drive assembly drives the connecting assembly to rotate relative to the housing in the second direction, the rib can press against the protrusion to cause the elastic arm to produce radial elastic deformation.

14. The strap adjustment device according to claim 1, characterized in that, The rotary drive assembly is provided with a guide protrusion, and the connecting assembly is provided with a guide groove. The guide protrusion can be fastened in the guide groove and slides with the guide groove.

15. An article having a strap adjustment device, characterized in that, Includes a strap adjustment device as described in any one of claims 1 to 14, mounted on the article.

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