A screw cap structure convenient to assemble and disassemble and a lacing device comprising the same

Abstract

This utility model relates to the field of detachable cap technology, solving the problems of slow assembly and time-consuming alignment in existing cap structures. It provides a cap structure that is easy to assemble and disassemble, along with a strapping device comprising the same. This easy-to-assemble and disassemble cap structure includes an inner cap and a outer shell. The outer shell is detachably mounted on the outside of the inner cap. The outer shell has a locking block, and the inner cap has a locking part. The locking block and the locking part are locked together to link the outer shell and the inner cap. The inner cap has an assembly guide. Under the action of the assembly guide, the locking block can move from a misaligned position (at least partially offset from the locking part) to an aligned position, thereby locking the locking block and the locking part together. The cap structure provided by this utility model has the advantages of not requiring precise alignment when assembling the outer shell and being easy to assemble.

Description

Technical Field

[0001] This utility model relates to the field of detachable technology, and in particular to a screw cap structure that is easy to assemble and disassemble, and a strapping device including the same. Background Technology

[0002] Currently, laces, ropes, or other tensioning mechanisms are commonly used to tighten footwear, clothing, or other items. Laces are typically located on footwear, clothing, or other items so that they can tighten the openings of the footwear, clothing, or other items.

[0003] Existing technologies employ lacing mechanisms to tighten the laces and secure the openings of shoes, clothing, hats, or other items. These mechanisms typically consist of a top cover and a screw cap. The top cover's primary function is to enhance the aesthetics of the lacing mechanism; it is fitted over the screw cap to achieve assembly. However, existing lacing mechanisms involve rigidly deforming the top cover relative to the screw cap to fit it. Since the top cover can only be accurately installed by aligning it with the screw cap from a specific angle, this assembly method is not only time-consuming and labor-intensive, but also often results in excessive deformation of the top cover, making replacement difficult. Furthermore, inaccurate or improper fitting of the top cover relative to the screw cap can reduce assembly precision and efficiency.

[0004] Therefore, there is an urgent need for a screw cap structure that does not require precise alignment during assembly, is easy to assemble and disassemble, and includes a strapping device. Utility Model Content

[0005] This utility model addresses the problems of slow assembly, precise alignment, and time-consuming and labor-intensive processes in existing technologies. To achieve one of its objectives, it provides a screw cap structure that facilitates assembly and disassembly. The structure includes an inner screw cap and a front cover. The front cover is detachably mounted on the outside of the inner screw cap and has a locking block. The inner screw cap has a locking part, and the locking block and the locking part are locked together to link the front cover and the inner screw cap. The inner screw cap has an assembly guide. The locking block can be directly locked to the locking part at its aligned position, or, under the action of the assembly guide, the locking block can move from a non-aligned position (at least partially offset from the locking part) to the aligned position of the locking part, thereby locking the locking block to the locking part.

[0006] "The alignment position of the snap-fit ​​part" refers to the alignment position where the snap-fit ​​part faces each other. Facing each other means that the snap-fit ​​block and the snap-fit ​​part can directly snap into each other after only axial displacement. The alignment position of the snap-fit ​​part can be directly set at the snap-fit ​​part, or other transition structures can be set to connect with the snap-fit ​​part. Therefore, the alignment position of the snap-fit ​​part can refer to a location, or it can refer to the structure located at that location, such as the snap-fit ​​part or the transition structure connected to the snap-fit ​​part.

[0007] The "interlocking connection" refers to two interconnected components, where the movement or change of one component can cause a corresponding movement or change in the other component. Specifically, the interlocking connection between the outer shell and the inner screw cap means that the movement of the outer shell may synchronously cause the movement of the inner screw cap, or the inner screw cap may begin to move synchronously only after the outer shell has moved for a period of time. Therefore, the interlocking connection means that the outer shell and the inner screw cap can move together during a certain stroke, allowing the outer shell a certain period of free movement. Interlocking connections include axial linkage and / or circumferential linkage. Circumferential linkage allows for different linkage methods between the outer shell and the inner screw cap in the clockwise or counterclockwise direction, or linkage only in one circumferential direction while not linkage in the opposite circumferential direction. In this application, "axial" refers to the direction of the rotation axis of the inner screw cap, and "circumferential" refers to the circumferential direction of the inner screw cap.

[0008] In this application, the assembly guide has a proximal end near the bottom of the inner screw cap and a relatively distal end. Here, "bottom of the inner screw cap" refers to the end where the front shell and inner screw cap first meet or intersect during the assembly process, or the end that directly faces the front shell during the assembly process.

[0009] To achieve one objective of this utility model, a swivel cap structure that facilitates assembly and disassembly is also provided, comprising an inner swivel cap and a front shell. The front shell is detachably mounted on the outside of the inner swivel cap, and the front shell has a locking block. The inner swivel cap has a locking portion, and the locking block and the locking portion are locked together to enable a linkage connection between the front shell and the inner swivel cap. The inner swivel cap has an assembly guide portion that is inclined relative to the rotation axis of the inner swivel cap. The assembly guide portion has a proximal end near the bottom of the inner swivel cap and a corresponding distal end. The alignment position of the locking portion is adjacent to the distal end of the assembly guide portion. The locking block can move to the alignment position of the locking portion and lock together with it under the cooperation of the assembly guide portion. In the phrase "the alignment position of the locking portion is adjacent to the distal end of the assembly guide portion," "the alignment position of the locking portion" refers to the structure located at this position, such as the locking portion or a transition structure connected to the locking portion.

[0010] In a preferred embodiment, the faceplate has a plurality of locking blocks, the same number as the locking portions; each locking portion corresponds to an assembly guide pair, and the assembly guide pair includes two unit assembly guides, each unit assembly guide having a proximal end near the bottom of the inner screw cap and an opposite distal end, the alignment position of the locking portion being adjacent to the distal end of each unit assembly guide in the assembly guide pair. The assembly guide pair can provide tolerance space for the alignment of the faceplate and the inner screw cap, that is, to achieve a non-perfectly precise alignment and locking of the faceplate and the inner screw cap. In this application, "a plurality of" refers to two or more, including two.

[0011] Preferably, the guide surface of the assembly guide or unit assembly guide is constructed as a spiral surface, an inclined surface, or an irregular surface, wherein the irregular surface is a combination of different spiral surfaces, different inclined surfaces, or a combination of spiral surfaces and inclined surfaces.

[0012] More preferably, the guide surfaces of the two unit assembly guides are inclined surfaces, and the inclination directions of the two inclined surfaces are symmetrical about the axial direction of the inner screw cap.

[0013] In another preferred embodiment, the faceplate is provided with a guided portion that cooperates with the assembly guide portion. The locking block can move to the alignment position of the locking portion under the cooperation of the assembly guide portion and the guided portion, and then the locking block is locked and connected with the locking portion.

[0014] Preferably, the mating surfaces of the assembly guide and the guided part are constructed as helical surfaces, inclined surfaces, or irregular surfaces, wherein the irregular surfaces are different helical surfaces, different inclined surfaces, or a combination of helical surfaces and inclined surfaces; the assembly guide and the guided part both have the same direction of rotation.

[0015] Preferably, the irregular surface is composed of different helical surfaces, different inclined surfaces, helical surfaces and inclined surfaces having the same direction of rotation.

[0016] The helical motion trajectory of a moving point on a helical surface is a composite motion trajectory of circular rotation and axial motion. The rotation direction of the helical surface refers to the direction of the helical motion in the circumferential direction. However, the motion trajectory of a moving point on an inclined surface cannot be decomposed into a circumferential component. Since the radial distance between the moving point on the inclined surface and the inner screw cap's rotation axis is equal, it can be considered as having a circumferential component (referred to as "circumferential motion"). The rotation direction of this circumferential motion is defined as the "equivalent rotation direction." In this application, to unify terminology, the circumferential component motion direction of a moving point on a helical surface or inclined surface is uniformly defined as the "equivalent rotation direction."

[0017] The "equivalent rotation direction" of a helical surface refers to the rotation direction of a moving point on a helix that is equidistant from the radial distance of the axis of rotation of the helical surface from the near end to the far end of the helical surface.

[0018] The "equivalent rotation direction" of an inclined or irregular surface refers to the direction of rotation of a moving point on the inclined or irregular surface that is equidistant from the rotation axis of the inner screw cap as it moves from the near end to the far end of the inclined or irregular surface.

[0019] In this application, the proximal end of the guided portion is close to the opening end of the face shell, and the proximal end of the guided portion is the end closest to the inner screw cap when the face shell is installed onto the inner screw cap.

[0020] The "equivalent rotation direction" of the assembly guide and the guided part refers to the direction of rotation of the moving point on the mating surface of the assembly guide and the guided part, which is the same radial distance from the rotation axis of the inner screw cap, as the moving point moves from the near end to the far end of the assembly guide.

[0021] The "equivalent rotation direction" can be either clockwise or counterclockwise.

[0022] Preferably, the guided part and the locking block are an integral structure. The locking block includes a locking surface that abuts and engages with the locking part, and the guided part is located on the opposite side of the locking surface. The locking block can move along the assembly guide to the alignment position of the locking part and engage with it. For example, the locking surface is located on the upper end face of the locking block, and the guided part is located on the lower end face of the locking block.

[0023] Preferably, the assembly guide is configured as a helical surface, inclined surface, or irregular surface that is inclined relative to the rotation axis direction of the inner screw cap.

[0024] Preferably, the helical direction or inclined direction of the assembly guide intersects with the rotation axis direction of the inner screw cap. The helical direction or inclined direction refers to the direction of the projection trajectory of the helical structure or inclined surface structure of the assembly guide onto the plane where the rotation axis of the inner screw cap is located.

[0025] Preferably, the assembly guide has a single equivalent rotation direction or two opposite equivalent rotation directions.

[0026] Preferably, the assembly guide includes a helical surface or an inclined surface, and the guided portion correspondingly includes a helical surface or an inclined surface, such that when an external force is applied to the faceplate, the guided portion slides along the helical surface or the inclined surface. In this case, the assembly guide has a single, identical direction of rotation. The "external force" refers to the resultant force of the external forces applied to the faceplate when assembling it to the inner screw cap.

[0027] Furthermore, the assembly guide and the guided part are respectively configured as a first helical surface and a second helical surface with sliding fit, or a first inclined surface and a second inclined surface with sliding fit.

[0028] The first helical surface includes opposing helical proximal ends and helical distal ends, with the helical proximal end of the first helical surface near the bottom of the inner spiral cap; the first inclined surface includes opposing inclined proximal ends and inclined distal ends, with the inclined proximal end of the first inclined surface near the bottom of the inner spiral cap; both the first helical surface and the first inclined surface have the same direction of rotation.

[0029] Preferably, the assembly guide includes two sub-guides with opposite rotational directions, and the guided portion correspondingly includes two sub-guides with opposite rotational directions; when an external force is applied to the faceplate, one of the two sub-guides can slide along one of the two sub-guides that it mates with. Each sub-guide has a single, identical rotational direction.

[0030] Preferably, the mating surfaces of the guide portion and the receiving portion are constructed as spiral surfaces, inclined surfaces, or irregular surfaces.

[0031] Preferably, the assembly guide includes two helical surfaces with opposite rotational directions, two inclined surfaces with opposite rotational directions, or one helical surface and one inclined surface with opposite rotational directions. Therefore, the assembly guide has two identical rotational directions, but in opposite directions. For example, the identical rotational directions of the two sub-guides of the assembly guide may be clockwise and counterclockwise.

[0032] Preferably, each assembly guide can be a continuous integral structure or it can include multiple assembly guide segments. Small gaps may exist between the multiple assembly guide segments, as long as they do not affect the continuity of the sliding of the guided part on the guide surface of the assembly guide.

[0033] Preferably, the inner screw cap includes multiple assembly guides and multiple snap-fit ​​parts, with the snap-fit ​​parts positioned adjacent to the distal ends of the assembly guides. When the guided part slides along the assembly guides to its distal end, completely disengaged from the assembly guides, the snap-fit ​​block aligns with the corresponding snap-fit ​​part.

[0034] Preferably, the plurality of assembly guides and the plurality of snap-fit ​​parts are evenly spaced around the outer peripheral surface of the inner screw cap.

[0035] Preferably, the locking block includes a locking surface for abutting and locking the locking portion; the guided portion is aligned with the locking surface in a direction parallel to the axial direction of the inner screw cap.

[0036] Preferably, the snap-fit ​​portion is configured as a snap-fit ​​groove. The snap-fit ​​groove can be a recess or a through groove.

[0037] Preferably, a snap-fit ​​part is provided between each pair of adjacent assembly guide parts, and the face shell is provided with a plurality of snap-fit ​​blocks in the same number as the snap-fit ​​parts.

[0038] Preferably, the multiple card blocks are of the same size, or the multiple card blocks have different sizes. "The multiple card blocks have different sizes" means that the multiple card blocks include at least two size specifications, that is, at least one card block has a different size than another card block.

[0039] Preferably, for an assembly guide with a single, identical rotation direction, each pair of adjacent assembly guides and a snap-fit ​​portion forms an assembly unit, and multiple assembly units are provided on the inner rotating cover, with the multiple assembly units evenly arranged around the outer circumferential surface of the inner rotating cover.

[0040] Preferably, for an assembly guide having two opposite and equal rotational directions, one assembly guide and two adjacent snap-fit ​​parts form an assembly unit, and two adjacent assembly units share one snap-fit ​​part.

[0041] Preferably, multiple assembly units are evenly arranged and surround the outer circumference of the inner rotating cover.

[0042] Multiple assembly units are evenly arranged and continuously surround the outer circumference of the inner screw cap. This structural design ensures that when the outer shell and inner screw cap are assembled, the position of the locking block on the outer shell corresponding to the inner screw cap falls into two categories: one, the locking block is located above the assembly guide; two, the locking block is located at the alignment position of the locking part. When assembling the outer shell and inner screw cap, if the locking block is located above the assembly guide, the guided part on the outer shell slides down under the action of the fastening force until the locking block aligns and engages with the locking part. In the other case, if the locking block is exactly located at the alignment position of the locking part, the locking block on the outer shell moves axially downward under the action of the fastening force until it is locked with the locking part. Therefore, when assembling the outer shell and inner screw cap, regardless of where the outer shell is snapped off from above the inner screw cap, it will directly or be guided to the alignment position of the locking part, and thus be locked and connected with the locking part. Therefore, this structural design allows the outer shell to be snapped onto the inner screw cap in a 360° omnidirectional manner without prior alignment or foolproof design, simplifying the assembly process of the outer shell and inner screw cap. In other words, the outer shell and inner screw cap can achieve a completely non-precise alignment and snap-fit ​​connection.

[0043] Preferably, the inner screw cap is further provided with an assembly groove, which is located at the alignment position of the snap-fit ​​portion on the outer side of the inner screw cap. When assembling the outer shell and the inner screw cap, if the outer shell is engaged from the alignment position of the snap-fit ​​portion, the assembly groove is used to guide the locking block to the snap-fit ​​portion position. In conjunction with the foregoing, the "alignment position of the snap-fit ​​portion" in this application can be the snap-fit ​​portion itself or the assembly groove.

[0044] Preferably, the assembly groove is adjacent to the distal end of the assembly guide.

[0045] Preferably, the inner screw cap is also provided with a separation groove, which is located on the outer circumferential surface of the inner screw cap and is offset from the locking part along the circumferential direction of the inner screw cap; when the locking block and the locking part are locked together, the outer shell can also rotate relative to the inner screw cap to rotate the locking block from the locking part position to the separation groove position, and separate the outer shell and the inner screw cap through the separation groove.

[0046] Preferably, there are multiple separation grooves, and each separation groove corresponds to a snap-fit ​​part.

[0047] Preferably, the assembly guide protrudes from the outer peripheral surface of the inner screw cap, and the separation groove is formed on the side wall of the assembly guide.

[0048] Preferably, the inner rotating cover is further provided with a rotation transition part, which is disposed between the snap-fit ​​part and the separation groove, and is used to guide the snap-fit ​​block to rotate from the snap-fit ​​part position to the separation groove position.

[0049] For other structural designs, functions, and methods of implementing the assembly groove, separation groove, and rotation transition section, please refer to the relevant content in patent CN202411574034.1.

[0050] Preferably, the side wall of the faceplate has a slit, and at least one side of the locking block is adjacent to the slit. The slit design enhances the deformability of the side wall of the faceplate where the locking block is located, thereby making the assembly and disassembly of the inner screw cap and the faceplate simpler and faster.

[0051] Further preferably, a first slit and a second slit are respectively formed on the sidewalls of the faceplate on both sides of the card block. The presence of slits on both sides of the card block further enhances its ability to elastically shift.

[0052] Preferably, the inner sidewall of the faceplate has a number of grooves corresponding to the number of the locking blocks, the locking blocks are disposed on the elastic sheet, and there is a gap between the elastic sheet and the two sides of the grooves.

[0053] Preferably, the separation groove is disposed on the side wall of the assembly guide portion, the assembly guide portion includes a plurality of assembly guide portion segments, and at least the assembly guide portion segment with the separation groove has a radial gap with the side wall of the inner screw cap.

[0054] Preferably, the separation groove is disposed on the side wall of the assembly guide portion, the assembly guide portion comprising a plurality of assembly guide portion segments, wherein at least one assembly guide portion segment having the separation groove has a radial gap with the side wall of the inner screw cap.

[0055] More preferably, the outer wall of the inner screw cap has a number of notches corresponding to the separation groove, and there is a gap between the assembly guide segment with the separation groove and the notch.

[0056] Preferably, an elastic element is provided between the outer shell and the inner screw cap, and the elastic element is connected to at least one of the outer shell and the inner screw cap. Specifically, the elastic element is connected to the outer shell, connected to the inner screw cap, or one end of the elastic element is connected to the outer shell and the other end is connected to the inner screw cap.

[0057] When the outer shell and the inner screw cap are in the assembled state, the elastic element stores elastic potential energy. When the locking block on the outer shell rotates to the separation groove position, the elastic element releases the elastic potential energy and generates an elastic restoring force. Under the action of this elastic restoring force, the outer shell can separate from the inner screw cap along the separation groove.

[0058] Preferably, any of the above-described shells are integrally formed with a decorative structure; or any of the above-described screw cap structures further includes a decorative element, which is linked to the shell.

[0059] Preferably, the integrally formed decorative structure of the face shell includes the face shell itself having a shape, the face shell having a decorative shape, and the face shell surface having patterns, hollow structures, etc.

[0060] Preferably, the decorative element and the outer shell can be linked by means including but not limited to one or more combinations of adhesive, magnetic attraction, snap-fit ​​connection, interference fit, and embedded fit.

[0061] Preferably, the decorative element is made of materials including but not limited to silicone, metal, and plastic.

[0062] Preferably, the decorative components include, but are not limited to, specially shaped components, epoxy resin sheets, and light-emitting chips. Specially shaped components include, but are not limited to, cartoon characters, floral characters, plant characters, animal characters, natural landscapes, and vehicle characters.

[0063] To achieve another objective of this utility model, a strapping device is provided, comprising a spool, a housing, and any of the above-mentioned screw cap structures that are easy to assemble and disassemble. The screw cap structure is rotatably mounted on the housing. The spool is configured to wind up the strap when rotating in a tightening direction and release the strap when rotating in a loosening direction. The strapping device has a winding strap mode. In the winding strap mode, the inner screw cap can only rotate relative to the housing in the tightening direction. When an external force is applied to the outer shell to assemble it onto the inner screw cap, the locking block moves to the alignment position of the locking part under the action of the assembly guide, and then the locking block is locked and connected with the locking part.

[0064] Preferably, the faceplate is provided with a plurality of locking blocks in the same number as the locking portions. Each locking portion corresponds to an assembly guide pair. The assembly guide pair includes two unit assembly guide portions. Each unit assembly guide portion is inclined relative to the rotation axis of the inner screw cap and has a proximal end near the bottom of the inner screw cap and a opposite distal end. The alignment position of the locking portion is adjacent to the distal end of each unit assembly guide portion in the assembly guide pair.

[0065] Preferably, the faceplate is provided with a guided portion that cooperates with the assembly guide portion, the assembly guide portion having a single equivalent rotation direction, and the guided portion correspondingly having a single equivalent rotation direction.

[0066] More preferably, the assembly guide and the guided part are respectively configured as a first helical surface and a second helical surface with sliding fit or a first inclined surface and a second inclined surface with sliding fit.

[0067] Preferably, the assembly guide has an equivalent rotation direction opposite to the tightening direction. When an external force is applied to the face shell to engage the inner screw cap, the guided part slides along the assembly guide while the inner screw cap rotates along the tightening direction, and the face shell moves axially until the locking block and the locking part are locked together.

[0068] Preferably, the assembly guide has the same rotation direction as the tightening direction. When an external force is applied to the face shell to engage the inner screw cap, the inner screw cap remains stationary, while the face shell simultaneously rotates along the tightening direction and moves linearly along the axial direction until the locking block engages with the locking part.

[0069] Preferably, the assembly guide includes two sub-guides with the same rotation direction but opposite directions, and the guided part correspondingly includes two sub-guides with the same rotation direction but opposite directions, such that when an external force is applied to the face shell, one of the two sub-guides slides along one of the two sub-guides that it slides into.

[0070] Preferably, the sub-guide portion that slides with one of the two sub-guide portions has the same rotation direction as the tightening direction. When an external force is applied to the face shell to engage the inner screw cap, one of the two sub-guide portions slides along the sub-guide portion while the inner screw cap rotates along the tightening direction, and the face shell moves axially until the locking block and the locking part are locked together.

[0071] Preferably, the sub-guide portion that slides into one of the two sub-guide portions has the same rotational direction as the tightening direction. When an external force is applied to the face shell to engage the inner screw cap, the inner screw cap remains stationary, while the face shell simultaneously rotates along the tightening direction and moves linearly along the axial direction until the locking block engages with the locking portion.

[0072] Preferably, the inner screw cap is also provided with a separation groove, which is offset from the locking part along the circumference of the inner screw cap and is located on one side of the locking part in the loosening direction.

[0073] Preferably, the inner rotating cover is further provided with a rotation transition portion, which is disposed between the locking portion and the separation groove, and is used to guide the locking block to rotate from the locking portion position to the separation groove position. Therefore, the rotation transition portion is also located on the loosening direction side of the locking portion.

[0074] The separation groove allows the front cover to be separated from the inner screw cap without the need for tools; in addition, the structural design of the assembly guide and the guided part makes the assembly and disassembly of the front cover and the inner screw cap relatively simple, further simplifying the replacement operation of the front cover.

[0075] Preferably, an elastic element is provided between the outer shell and the inner screw cap, and the elastic element is connected to at least one of the outer shell and the inner screw cap; when the strapping device is in the winding strapping mode, the outer shell can rotate relative to the inner screw cap in the loosening direction to rotate the locking block from the locking part position to the separation groove position, and then the outer shell is separated from the inner screw cap via the separation groove by means of the restoring force of the elastic element.

[0076] Preferably, the fastening device further includes a check mechanism, ensuring that the inner screw cap can only rotate relative to the housing along the tightening direction in the winding fastening mode; the check mechanism includes a first check member and a second check member that cooperate with each other, and the first check member is a ratchet or a groove; the fastening device further includes a limiting part for limiting the axial displacement of the second check member. The second check member refers to a check member that cooperates with the first check member and is capable of offset. The so-called "offset" can be circumferential or radial offset, and the form of offset is not limited, as long as offset can occur. The so-called "limiting the axial displacement of the second check member" does not mean that the axial displacement of the second check member is strictly zero, but rather that a certain amount of axial displacement is allowed, as long as its structure is not damaged. For example, if there is a gap between the second check member and the limiting part at the initial position, but the second check member undergoes axial displacement under the action of friction and comes into contact with the limiting part, this amount of axial displacement is negligible and will not affect the structural stability of the second check member. Preferably, the amount of axial displacement of the second check member should not exceed the deformation threshold at which the second check member will fail. For example, if the second check member warps up to 100% of its own thickness, it will cause it to break and fail, then the amount of axial displacement should not exceed 100% of the thickness of the second check member itself.

[0077] Preferably, the first anti-reverse component and the second anti-reverse component are respectively disposed on the housing and the inner screw cap.

[0078] Preferably, the second anti-reverse component and the limiting part are both disposed on the housing, or both are disposed on the inner screw cap.

[0079] Preferably, the limiting part and the second anti-reverse member are disposed on the same component of the fastening device, and a force lock or shape lock is formed between the limiting part and the second anti-reverse member to restrict the axial displacement of the second anti-reverse member. "Force lock" refers to a locking function achieved by means of an applied external force and its reverse force at the contact point. Specifically, the external force causes the first anti-reverse member to move upward, generating friction on the meshing surfaces of the first and second anti-reverse members. The second anti-reverse member is subjected to a frictional force along the axial direction towards the first anti-reverse member, causing it to contact the limiting part. The reverse force applied by the limiting part to the second anti-reverse member at the contact point has a component along the axial direction away from the first anti-reverse member, preventing the second anti-reverse member from undergoing axial displacement. "Shape lock" refers to a locking method that uses the geometric constraints generated by the structural shape of the components to lock their relative movement. "The limiting part and the second anti-reverse member are disposed on the same component of the fastening device" means that they are both disposed on the housing or the screw cap structure.

[0080] Preferably, the second anti-reverse component is one of a ratchet, a deflectable component, and a swing arm. Any anti-reverse component that can engage with a ratchet and can deflect can be used as the second anti-reverse component.

[0081] Preferably, the anti-reverse mechanism further includes a third anti-reverse member. The second and third anti-reverse members are disposed on the same component of the belt device. The second anti-reverse member is an offset member, and the third anti-reverse member is a stop member. The head of the stop member is configured as a backflow limiting portion. The offset member includes a neck joint protrusion. The backflow limiting portion cooperates with the neck joint protrusion to limit the axial displacement of the second anti-reverse member.

[0082] The beneficial effects of this utility model include:

[0083] 1. The screw cap structure and the strapping device included therein provided by this utility model are easy to assemble and disassemble. By setting an assembly guide on the inner screw cap, a screw cap structure with non-perfectly precise alignment and snap-fit ​​is provided, so that the outer shell and the inner screw cap do not need to be strictly aligned during assembly, which increases the accuracy and convenience of assembly.

[0084] 2. By correspondingly setting assembly guides and guided parts on the inner screw cap and the outer shell, the outer shell is guided to slide to the alignment position during assembly with the inner screw cap, allowing the locking block and locking part to align and engage. This not only saves time and effort, but also ensures that the locking block and locking part will only elastically deform and align and engage when the guided part on the outer shell is guided to slide to the alignment position of the locking part by the assembly guide. This avoids excessive compression deformation and does not affect subsequent replacement of the outer shell. It also ensures that the outer shell is accurately and properly fitted relative to the screw cap, improving assembly accuracy.

[0085] 3. For screw cap structures that include assembly guide pairs with non-perfectly precise alignment and snap-fit, when the outer shell is to be assembled with the inner screw cap from above, the outer shell can fall within a certain tolerance range, so that the assembly of the outer shell and the inner screw cap has a certain degree of alignment and flexibility. The construction of this screw cap structure is relatively simple and is in line with the usage habits of some user groups.

[0086] 4. A non-precisely aligned snap-fit ​​cap structure: As a special case of non-precise alignment snap-fit, the outer shell can be snapped onto the inner cap from any position above it. If this position is aligned with the snap-fit ​​part, the snap-fit ​​block can simply move downwards axially to reach the snap-fit ​​part and achieve engagement. If the snap-fit ​​block is misaligned, the guide part slides down under the guidance of the assembly guide until the snap-fit ​​block aligns with the snap-fit ​​part. Applying further snapping force then secures the outer shell to the inner cap. Therefore, this structural design allows the outer shell to be snapped off from any position above the inner cap and ultimately guided and positioned to snap onto the inner cap, making assembly of the outer shell and inner cap more convenient and flexible.

[0087] 5. The screw cap structure provided by this utility model, which is easy to assemble and disassemble, is not limited to application to strapping devices, but is also applicable to other snap-fit ​​and disassembly systems with non-precise alignment installation requirements. Attached Figure Description

[0088] 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.

[0089] Figure 1 This is an exploded structural diagram of Embodiment 1 of the screw cap structure of this utility model, which is easy to assemble and disassemble;

[0090] Figure 2 yes Figure 1 A structural schematic diagram of the shell shown from another perspective;

[0091] Figure 3 yes Figure 1 A schematic diagram of another structure of the faceplate in the embodiment of the screw cap structure shown;

[0092] Figure 4 yes Figure 1 A schematic diagram of another structure of the faceplate in the embodiment of the screw cap structure shown;

[0093] Figure 5 This is an exploded structural diagram of Embodiment 2 of the screw cap structure of this utility model, which is easy to assemble and disassemble;

[0094] Figure 6 yes Figure 5 A structural schematic diagram of the shell shown from another perspective;

[0095] Figure 7 yes Figure 5 The diagram shows the structure of the inner screw cap;

[0096] Figure 8 yes Figure 5 The diagram shows the force analysis of the outer shell and inner screw cap in the screw cap structure under the action of the fastening force.

[0097] Figure 9 yes Figure 5 A schematic diagram of another structure of the inner screw cap in the embodiment shown;

[0098] Figure 10 yes Figure 5 A schematic diagram of another structure of the faceplate in the embodiment of the screw cap structure shown;

[0099] Figure 11 yes Figure 10 A structural schematic diagram of the shell shown from another perspective;

[0100] Figure 12 yes Figure 5 A schematic diagram of another structure of the faceplate in the embodiment of the screw cap structure shown;

[0101] Figure 13 This is a schematic diagram of the face shell structure in Embodiment 3 of the screw cap structure of this utility model, which is easy to assemble and disassemble;

[0102] Figure 14 This is a schematic diagram of the inner screw cap structure in Embodiment 3 of the present invention, which features a screw cap structure that is easy to assemble and disassemble.

[0103] Figure 15 This is a force analysis diagram of the outer shell and inner screw cap under the action of external force during fastening in Embodiment 3 of the screw cap structure of this utility model;

[0104] Figure 16This is a schematic diagram of the face shell structure of Embodiment 4 of the present invention, which features a screw cap structure that is easy to assemble and disassemble.

[0105] Figure 17 This is a schematic diagram of the inner screw cap structure of Embodiment 4 of the present invention, which features a screw cap structure that is easy to assemble and disassemble.

[0106] Figure 18 This is a simplified schematic diagram of a modified implementation of the two sub-guide portions and two sub-received guide portions of Embodiment 4 of the screw cap structure of this utility model;

[0107] Figure 19 This is a schematic diagram of the face shell structure of Embodiment 5 of the present invention, which features a screw cap structure that is easy to assemble and disassemble.

[0108] Figure 20 This is a schematic diagram of the inner screw cap structure of Embodiment 5 of the present invention, which features a screw cap structure that is easy to assemble and disassemble.

[0109] Figure 21 This is an assembly diagram of the inner screw cap and the anti-reverse mechanism in the screw cap structure of this utility model that is easy to assemble and disassemble.

[0110] Figure 22 This is an exploded structural diagram of Embodiment Six of the present invention, which features a screw cap structure that is easy to assemble and disassemble.

[0111] Figure 23 yes Figure 22 A full sectional front view of one embodiment of the screw cap structure after assembly;

[0112] Figure 24 yes Figure 23 A full sectional front view of the screw cap structure when the outer shell and inner screw cap are separated;

[0113] Figure 25 yes Figure 22 A full sectional front view of another embodiment of the screw cap structure after assembly;

[0114] Figure 26 This is a schematic diagram of the face shell structure of Embodiment 7 of the present invention, which features a screw cap structure that is easy to assemble and disassemble.

[0115] Figure 27 This is a schematic diagram of the inner screw cap structure of Embodiment 7 of the present invention, which features a screw cap structure that is easy to assemble and disassemble.

[0116] Figure 28 This is a schematic diagram of the decorative faceplate in the screw cap structure of this utility model, which is easy to assemble and disassemble;

[0117] Figure 29 This is a top view schematic diagram of an embodiment of the decorative component of this utility model;

[0118] Figure 30 It includes Figure 29 An exploded view of an embodiment of the screw cap structure for easy assembly and disassembly of the decorative element shown;

[0119] Figure 31 This is an exploded structural diagram of a first embodiment of a tethering device with a screw cap structure that is easy to assemble and disassemble according to the present invention.

[0120] Figure 32 This is an exploded structural diagram of Embodiment 2 of the tethering device including the screw cap structure of this utility model that is easy to assemble and disassemble;

[0121] Figure 33 This is an exploded structural diagram of Embodiment 3 of the tying device with a screw cap structure that is easy to assemble and disassemble according to this utility model;

[0122] Figure 34 yes Figure 33 The diagram shows the assembly structure of the offset component and the housing in Embodiment 3 of the tethering device.

[0123] Figure 35 This is a schematic diagram of the assembly structure of the offset component and the shell in the prior art;

[0124] Figure 36 yes Figure 34 A top view of the assembly structure shown;

[0125] Figure 37 yes Figure 36 A cross-sectional view along the AA direction;

[0126] Figure 38 When the outer shell and inner screw cap rotate and separate, Figure 37 The diagram shows the force analysis of the contact surface between the offset component and the stop component.

[0127] Explanation of icon numbers:

[0128] 10, 100, 100A, 100A': Inner screw cap; 101, ratchet; 102, 110, 110A: Snap-fit ​​part; 111, Assembly groove; 112, Snap-fit ​​surface; 12L, 12R, 120, 120A: (Unit) Assembly guide part; 1201 / 12011 / 12012, Separate guide part; 121, First spiral surface; 122, First inclined surface; 130, 130A: Separation groove; 131, First groove surface; 132, Second groove surface; 140: Rotation transition part; 150, Elastic element;

[0129] 20, 200, 200A, 200B, 200': Faceplate; 20G, Groove; 201, Adhesive Groove; 202, Elastic Plate; 21, 21A, 21B, 210, Locking Block; 211, Locking Surface; 220, Guided Part; 2201 / 22011 / 22012, Sub-Guided Part; 221, Second Helical Surface; 222, Second Inclined Surface; 231, First Gap; 232, Second Gap; 240, Locking Slot;

[0130] 300. Decorative parts;

[0131] 400, 400': Housing; 401, 401': Second anti-reverse component, elastic pawl, offset component;

[0132] 402', Stop component; 403, Check valve limiting part; 404, Neck joint protrusion;

[0133] 500, cable reel; 600, base component. Detailed Implementation

[0134] 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.

[0135] 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.

[0136] 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.

[0137] 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.

[0138] The following description, in conjunction with the accompanying drawings and specific embodiments, details the screw cap structure of this utility model that is easy to assemble and disassemble, as well as the fastening device containing it.

[0139] As one objective of this utility model, it provides a screw cap structure that facilitates assembly and disassembly, wherein the outer shell and the inner screw cap can be engaged even without precise alignment. This "non-precise alignment engagement," also known as "not fully precise alignment engagement," means that the locking block can perform the assembly operation of the outer shell and the inner screw cap within a certain radius, including the precisely aligned position of the engagement part. A "fully non-precise alignment engagement" is a special case of the non-fully precise alignment engagement, where the locking block, after being dropped from any direction, can slide to the precisely aligned position of the engagement part, thus completely eliminating the need to consider the angle of the locking block's fall. The outer shell can be dropped relative to the inner screw cap from all 360° omnidirectional angles for assembly. Figures 1 to 4 The illustrated embodiment reveals the typical situation of a non-perfectly precise alignment card connection scheme; Figures 5 to 23 The illustrated embodiment discloses a scheme of completely non-precise alignment and snap-fit. When the sizes of the multiple snap-fit ​​blocks in this embodiment are different, it also constitutes a technical solution of non-precise alignment and snap-fit.

[0140] refer to Figures 1 to 4 This utility model provides a first embodiment of a screw cap structure that is easy to assemble and disassemble, including an inner screw cap 10 and a front cover 20. The front cover 20 is detachably installed on the outside of the inner screw cap 10. The front cover 20 is provided with a locking block 21, and the inner screw cap 10 is provided with a locking part 102. The locking block 21 and the locking part 102 are locked together to enable the front cover 20 and the inner screw cap 10 to be linked together. The inner screw cap 10 is provided with assembly guide parts (12L, 12R). The guide surfaces of the assembly guides (12L, 12R) have a proximal end near the bottom of the inner screw cap 10 and a distal end opposite to it. The engaging portion 102 is adjacent to the distal end of the assembly guides (12L, 12R), allowing the locking block 21 to slide from a misaligned position at least partially offset from the engaging portion 102 along the guide surface of the assembly guide to the distal end of the assembly guide, where it reaches an aligned position facing the engaging portion 102, thus engaging and locking the locking block 21 with the engaging portion 102. Obviously, when the locking block 21 is positioned at the aligned position facing the engaging portion 102 as the cover falls, it directly engages and locks with the engaging portion 102 after axial movement. Preferably, one engaging portion 102 corresponds to one assembly guide pair, which includes two unit assembly guides 12L and 12R, with the distal end of each unit assembly guide 12L and 12R adjacent to the same engaging portion 102.

[0141] Furthermore, such as Figure 2As shown, the locking block 21 is disposed on the inner sidewall of the face shell 20. One or more locking blocks 21 can be provided, the same number as the locking parts 102. Assembly guide pairs are also provided in one or more pairs. Preferably, one assembly guide pair 12L and 12R corresponds to one locking part 102. The assembly guide pairs 12L and 12R are disposed on both sides of the locking part 102, forming a fault-tolerant alignment space P between them. This allows the corresponding locking block 21 to fall from any point above the fault-tolerant alignment space P and engage with the inner rotating cover 10. Under the action of any unit assembly guide, the locking block 21 can engage with the locking part 102 within the fault-tolerant alignment space P, achieving a non-perfectly precise alignment engagement. Specifically, in this embodiment, the locking block 21 includes three locking blocks 211, 212, and 213, with three corresponding locking parts 102 and three pairs of assembly guides. Locking block 211 corresponds to locking part 1021, and the assembly guide pairs corresponding to locking part 1021 are 12L1 and 12R1. A fault-tolerant alignment space P1 is formed between them. Locking block 211 can fall from any position above the fault-tolerant alignment space P1, either sliding under the influence of assembly guide pairs 12L1 and 12R1 to directly above locking part 1021 and engaging with it, or falling directly above locking part 1021 and engaging with it. The arrangement of 12L and 12R in the assembly guides allows the locking block to slide down from a non-precise alignment position of the locking part and engage with it. The fault-tolerant alignment space formed by the assembly guide pairs provides a certain amount of free space for the non-precise alignment engagement of the face shell 20 and the inner rotating cover 10. (Refer to...) Figure 1 The unit assembly guide portion 12L or 12R is inclined relative to the rotation axis direction of the inner rotating cover 10, and the inclination directions of the unit assembly guide portions 12L and 12R relative to the rotation axis direction are opposite. Specifically, as shown in... Figure 1 As shown, the proximal end of 12L tilts to the left, and the proximal end of 12R tilts to the right, approximating a trumpet shape. This provides a larger tolerance space for the snap-fit ​​between the faceplate and the inner screw cap. Alternatively, only one assembly guide can be provided, such as only the left 12L or only the right 12R, with a limiting wall extending parallel to the rotation axis of the inner screw cap on the other side. This allows the locking block to slide only along one side until it engages with the locking part, providing only a single-sided tolerance space for the inner screw cap, thus reducing the range of possible alignment angles when the faceplate is assembled with the inner screw cap. More preferably, in this embodiment, the guide surface of the assembly guide 12L or 12R is constructed as a slope or a spiral surface. Of course, the guide surface can also be an irregular shape, such as a slope or spiral surface with different inclinations. The end of the locking block 21 is chamfered to facilitate sliding along the guide surface. Furthermore, the three locking blocks can be the same size, so that each locking block can engage with any of the three locking parts, allowing for a wider range of drop directions when the faceplate is assembled with the inner screw cap. In other preferred embodiments, the three locking blocks 211, 212, and 213 can also be of different sizes, for example, referring to... Figure 1 The size of the locking block 211 is different from that of locking blocks 212 and 213, and the size of the locking part is also adjusted to make a one-to-one correspondence between the locking block and the locking part. When the faceplate is assembled to the inner screw cap, the locking block 211 can only fall from the misalignment space P1 corresponding to the locking part 1021. Although the size difference of the locking blocks reduces the randomness of the faceplate snapping direction, the differentiated locking blocks also have a foolproof function, and the misalignment space of each locking block still provides a certain degree of freedom of choice when aligning and snapping, which can meet the needs of some users who want to balance randomness and a certain degree of precision when assembling the faceplate and the inner screw cap.

[0142] Please refer to the reference. Figure 1 Preferably, the inner screw cap 10 is further provided with a separation groove 130. The separation groove 130 is located on the outer peripheral surface of the inner screw cap 10 and is offset from the locking part 102 along the circumference of the inner screw cap 10. The face shell 20 can also rotate relative to the inner screw cap 10 to rotate the locking block 21 from the locking part 102 to the separation groove 130. Then, by applying a lifting force and passing through the separation groove 130, the face shell 20 and the inner screw cap 10 are separated from each other. Preferably, multiple separation grooves 130 are provided, and each separation groove 130 corresponds one-to-one with the locking part 102. Each separation groove 130 and the corresponding locking part 102 can form a split-joint structure. In this way, by providing multiple separation grooves 130 on the outer circumferential surface of the inner screw cap 10, each corresponding to a locking portion 102, and forming multiple separation and engagement structures with the corresponding locking portions 102, the faceplate 20 and the inner screw cap 10 can be quickly separated or engaged, and the cooperation force between the two is uniform and stable, thus enabling easy replacement of the faceplate. Further preferably, the inner screw cap also provides a rotation transition portion 140, which is located between the locking portion 102 and the separation grooves 130, to guide the locking block 21 to rotate from the locking portion 102 to the separation groove 130. Further, when this screw cap structure is applied to a fastening device, the fastening device has a non-reverse direction (i.e., a loosening direction). In order for the locking block 21 of the faceplate to rotate relative to the inner screw cap to the separation groove 130, the separation groove 130 is preferably located on the loosening side of the locking portion 102, such as... Figure 1 The counter-clockwise side shown (from a top view) includes the strapping device of the screw cap structure. Figure 31The direction of loosening the strap (as shown) or the direction of preventing reversal is counterclockwise. Preferably, the locking part 102 and the separation groove 130 are connected by a rotation transition part 140. The rotation transition part 140 may include a transition arc surface and a rotation guide part. The transition arc surface is adjacent to the side of the locking part 102 near the separation groove 130, and the rotation guide part is disposed between the separation groove 130 and the transition arc surface. The transition arc surface is used to guide the locking block 21 to smoothly leave the locking part 102 when the face shell 20 and the inner screw cap 10 rotate and separate. Therefore, by providing the rotation transition part 140, the locking block 21 can be guided to move smoothly away from the locking part 102, reducing interference and wear. In particular, the transition arc surface can reduce its blocking force on the side wall of the locking block 21, thereby making the rotation of the locking block smoother, and thus only an appropriate external force is needed to guide the locking block 21 to move away from the locking part. Furthermore, the depth of the separation groove 130 can gradually increase from the bottom of the inner screw cap 10 to the opening end, so that the bottom surface of the separation groove 130 forms an inclined surface, thereby allowing the inner screw cap 10 and the outer shell 20 to gradually and smoothly separate under the action of external force. Other specific structures and methods for separating the outer shell and the inner screw cap using the separation groove 130 and the rotation transition part 140 can be found in the relevant content of patent CN202411574034.1.

[0143] To facilitate assembly and disassembly of the outer shell and inner screw cap in the first embodiment of the screw cap structure, the elastic deformation capability or elastic displacement capability of the locking block 21 can be increased. (See also...) Figure 3 The sidewall of the faceplate 20A has a slit, and at least one side of the locking block 21A is adjacent to the slit. Preferably, a first slit 231 and a second slit 232 are respectively provided on the sidewall of the faceplate 20A corresponding to the two sides where the locking block 21A is located. This strengthens the elastic deformation capacity of the sidewall of the faceplate supporting the locking block 21A, providing a certain restoring elastic force for the locking block 21A. During the assembly or disassembly of the inner screw cap and the faceplate, the locking block 21A will not be damaged, and the process is more effortless and smooth. The first slit 231 and the second slit 232 can be formed by etching or hollowing out the faceplate 20A, or they can be integrally formed during the injection molding process of the faceplate 20A, making the locking block 21A less prone to damage or detachment during use. However, because the faceplate with slits on the sidewall has a strong elastic deformation capacity, it is also more likely to fall off during use, assembly, and disassembly, reducing reliability. On the other hand, although opening gaps on both sides of the locking block makes it easier and less strenuous to assemble and separate the front cover and the inner screw cap, and the locking block is less likely to be damaged, the gaps on the front cover also limit the appearance or shape design of the front cover.

[0144] To balance the elasticity of the card block and the plasticity of the surface shell, preferably, referring to Figure 4The inner wall of the faceplate 20B has a number of grooves 20G corresponding to the number of locking blocks. The locking blocks 21B are disposed on the elastic sheet 202. There is a gap between the elastic sheet 202 and the two sides of the grooves 20G. This structural design not only enables the locking blocks 21B to have elastic deformation capability or elastic displacement capability, but also, since the elastic sheet 202 is located inside the faceplate 20B, the appearance or shape design of the faceplate 20B can still maintain strong plasticity.

[0145] The first type of screw cap structure shown in the first embodiment allows the outer shell to be snapped onto the inner screw cap in a non-precise alignment manner. However, the angle range at which the outer shell can fall is limited, which is a common solution for non-perfectly precise alignment and snapping. To further increase the flexibility and arbitrariness of alignment during outer shell assembly, and even to achieve 360° omnidirectional snapping between the outer shell and the inner screw cap, such as... Figures 5 to 23 As shown, by providing a guided portion on the faceplate that mates with the assembly guide portion, a second type of screw cap structure is provided that enables a snap-fit ​​connection that requires no precise alignment. For example, please refer to... Figures 5 to 8 An embodiment of a second type of screw cap structure is provided, including an inner screw cap 100 and a face shell 200. The face shell 200 is detachably mounted on the outside of the inner screw cap 100. The face shell 200 is provided with a locking block 210, and the inner screw cap 100 is provided with a locking portion 110. The locking block 210 and the locking portion 110 are locked together to enable a linkage connection between the face shell 200 and the inner screw cap 100. The inner screw cap 100 is provided with an assembly guide portion 120, and the face shell 200 is correspondingly provided with a guided portion 220. Under the cooperation of the assembly guide portion 120 and the guided portion 220, the locking block 210 can move from a misaligned position that is at least partially offset from the locking portion 110 to an aligned position that faces the locking portion 110, thereby aligning and engaging the locking block 210 with the locking portion 110. It is obvious that when the locking block 210 is in the alignment position facing the locking part 110, the locking block 210 will directly align and engage with the locking part 110 after axial movement.

[0146] Furthermore, the assembly guide 120 is axially inclined relative to the inner screw cap. The assembly guide 120 has a proximal end near the bottom of the inner screw cap and a relatively distal end. The engaging part 110 is adjacent to the distal end of the assembly guide 120. Therefore, when assembling the face shell 200 and the inner screw cap 100, the face shell 200 can move to the alignment position of the locking block 210 and the engaging part 110 under the cooperation of the assembly guide 120 and the guided part 220, thus achieving alignment and engagement. This makes the assembly operation more convenient and faster. This design eliminates the need for the face shell to be aligned with the inner screw cap in a specific orientation, and allows the locking block to move to the alignment position of the engaging part under the guidance of the assembly guide and the guided part. This ensures that the face shell 200 and the inner screw cap can be accurately and properly fitted, improving assembly accuracy and avoiding the hassle of precise alignment. It makes the assembly of the face shell and the inner screw cap more convenient and faster, and significantly increases the success rate.

[0147] Preferably, in the second type of screw cap structure, the assembly guide portion 120 and the guided portion 220 can be constructed as a helical surface or an inclined surface with a single, identical direction of rotation. Specifically, this includes a slidingly engaging first helical surface 121 and a second helical surface 221, or a slidingly engaging first inclined surface 122 and a second inclined surface 222. In the embodiments listed in this utility model, the guided portion 220 is integrally formed with the locking block 210 and is opposite to the locking surface 211; in other embodiments, the guided portion 220 can also be an independent component. Figure 7 As shown, the first helical surface 121 includes a proximal helical surface P near the bottom of the inner screw cap and an opposing distal helical surface D, with the engaging portion 110 adjacent to the distal helical surface D. The direction of movement from the proximal helical surface P to the distal helical surface D is the helical direction of the helical surface, and the equivalent rotation direction of the first helical surface 121 is counterclockwise. Further, the distal helical surface of the first helical surface 121 is adjacent to the axial center of the outer peripheral surface of the inner screw cap 100, and preferably located at the axial center. The structure of the second helical surface 221 is adapted to the structure of the first helical surface 121, and will not be described again here. In this utility model, "center" does not only refer to the exact middle position of the axial height of the inner screw cap, but also includes any intermediate position between the bottom and the opening end of the inner screw cap. In other preferred embodiments, the assembly guide portion 120 and the guided portion 220 can also be constructed as a combination of multiple helical surfaces and / or multiple inclined surfaces having the same equivalent rotation direction.

[0148] Optionally, in the second type of screw cap structure, the assembly guide can also be configured to include two sub-guides with the same rotation direction but opposite directions. For example... Figure 17As shown, the assembly guide 120 includes two first inclined surfaces 122, each of which includes a proximal end P near the bottom of the inner screw cap and a distal end D opposite to it, with the engaging portion adjacent to the distal end D. The direction from the proximal end P to the distal end D is the inclination direction of the inclined surface. The two first inclined surfaces 122 have opposite, equivalent rotational directions, namely clockwise and counterclockwise, respectively. The distal end D of the first inclined surface 122 is adjacent to the axial center of the outer peripheral surface of the inner screw cap 100, and preferably located at the axial center. The structure of the second inclined surface 222 is adapted to the structure of the first inclined surface 122, and will not be described further here. Therefore, by employing a sliding-fit helical surface or a sliding-fit inclined surface, the faceplate 200 can move smoothly and steadily relative to the inner screw cap 100, causing the locking block 210 to move to an aligned position facing the engaging portion 110, and then until it is aligned and engaged with the engaging portion 110.

[0149] Continue to refer to Figures 5 to 8 Preferably, as a second embodiment of the screw cap structure that facilitates assembly and disassembly, in this embodiment, the assembly guide 120 and the guided portion 220 are respectively described using a helical surface, and the equivalent rotation direction of the helical surface of the assembly guide is counterclockwise. When a fastening force is applied to the face shell 200 towards the inner screw cap 100, the direction of the fastening force is from the bottom of the inner screw cap 100 towards the opening end. Under the action of the pressing force F, the assembly guide 120 of the inner screw cap abuts against the guided portion 220 of the face shell, and the fastening force received by the guided portion 220 has a component force F perpendicular to the inclined plane. a Simultaneously, the guided part 220 itself also experiences gravity G1, which has a component Ga perpendicular to the inclined plane. The resultant force of this component Fa and Ga is the pressure exerted by the guided part 220 on the guide part 120. Correspondingly, according to the principle of action and reaction, the guided part 220 will experience a reverse supporting force P perpendicular to the inclined plane, and P = Fa + Ga. The supporting force P has a horizontal component P2 and a vertical component P1. Under the action of the pressing force F, the guided part 220 has a tendency to move downward or move downward along the contact surface, so the guided part 220 will experience a frictional force f obliquely upward along the contact surface. When the guided part 220 overcomes the static friction and begins to slide along the assembly guide part 120, the coefficient of dynamic friction of the dynamic frictional force f is fixed, and the frictional force f can be decomposed into a horizontal component f2 and a vertical component f1. Mathematical calculations show that when the guided part 220 is only subjected to the pressing force F, the resultant force on the guided part 220 has a vertically downward component and a horizontal component, allowing the guided part 220 to move axially downward and rotate counterclockwise. However, in practical applications (such as...) Figures 31 to 33In the lacing device shown, a reverse torque M is often applied by hand, so that the guided part (i.e. the face shell) can only move downward along the axis.

[0150] Similarly, force analysis of the assembly guide 120 shows that the guide 220 applies a pressure P' = Fa + Ga to the assembly guide 120, while simultaneously subjecting it to a reverse frictional force f'. The pressure P' has a vertical component P'1 and a horizontal component P'2, and the frictional force f' has a vertical component f'1 and a horizontal component f'2. When the downward movement of the inner cap is prevented by other structures, the component preventing its downward movement applies an upward supporting force Fs to the assembly guide 120. This force balances the resultant force of gravity G2 and the components P'1 and f', i.e., Fs = G2 + P'1 + f'1. In practical applications, the assembly guide 120 is fixed to the inner cap 100, and the inner cap 100, when the fastening device is in the winding fastening mode, cannot move axially downward relative to the housing. Therefore, in the axial direction, the forces on the inner cap (assembly guide 120) are balanced. Since the horizontal component of pressure P', P'2, is greater than the horizontal component of frictional force f', f'2, the assembly guide 120 (or inner screw cap) will rotate clockwise.

[0151] In summary, when the faceplate is subjected to a downward vertical pressure and a clockwise torque (rotational force), the faceplate moves downward axially while the inner screw cap rotates clockwise. This causes the guided portion to slide along the assembly guide portion, allowing the locking block to slide above the locking portion, thereby achieving the locking of the faceplate and the inner screw cap. In the application of this embodiment (e.g.) Figures 31 to 33 In any of the shown strap devices, the clockwise direction is the tightening direction of the strap device, and the equivalent rotation direction of the assembly guide is the counterclockwise direction. Therefore, the inner screw cap can rotate clockwise, and the faceplate only needs to move downwards axially, resulting in a good user experience. However, the clockwise and counterclockwise directions are only for a specific embodiment shown in the view, and the tightening direction of the strap device is not limited to the clockwise direction. However, when the faceplate moves downwards axially, the rotatable direction of the inner screw cap is the tightening direction of the strap device, and the equivalent rotation direction of the assembly guide is opposite to this.

[0152] Similar to the first embodiment, this embodiment also includes a separation groove 130 and a rotation transition portion 140, such as... Figure 7As shown, this allows for easy separation of the screw cap structure; the difference is that in the second embodiment, the separation groove 130 is located on the side of the assembly guide. Since the faceplate in the second embodiment can fall at any angle to assemble with the inner screw cap, the assembly unit composed of the assembly guide and the snap-fit ​​part is continuously arranged along the outer periphery of the inner screw cap. Therefore, unlike the first embodiment, it is impossible to reserve space for a separation groove in the circumferential direction; the separation groove can only be located on the side of the assembly guide. However, since the snap-fit ​​block 210 and the separation groove 130 have relatively poor deformability, Figure 5 The screw-on cap structure shown is somewhat difficult to separate from the inner cap. To further simplify the separation operation of the inner cap and the outer shell in the second embodiment, it is preferable to increase the elastic deformation capability of the locking block or the separation groove.

[0153] Preferred, such as Figure 9 As shown, the outer wall of the inner screw cap 100A has a number of notches corresponding to the separation groove. A radial gap exists between the assembly guide portion with the separation groove and the notch to increase the elastic deformation capability of the separation groove 130A. To further increase the elastic deformation capability of the separation groove 130A, preferably, the assembly guide portion 120A includes multiple segments. In this embodiment, it includes two assembly guide segments, wherein the assembly guide segment with the separation groove 130A also has a circumferential gap with its adjacent structure. Specifically, the assembly guide segment with the separation groove 130A has gaps 1001 and 1002 between it and the snap-fit ​​portion 110A and the adjacent assembly guide segment 120A(R). Preferably, the gap 1002 between the assembly guide segment with the separation groove and the adjacent assembly guide segment is relatively narrow so that the continuity of the sliding of the guided portion on the faceplate is not affected by the presence of the gap 1002 when sliding along the assembly guide portion. In other preferred embodiments, the entire assembly guide may be configured to be elastic, while the snap-fit ​​portion 110A is preferably non-elastic. For example... Figure 9 In the illustrated screw cap embodiment, the locking block is configured to have low elasticity, and the locking part 110A has low elasticity, which is more conducive to the firm locking between the outer shell and the inner screw cap; at the same time, the separation groove is configured to be elastic, which makes it easier and more convenient to disassemble the locking block and the separation groove.

[0154] Another implementation method for optimizing the disassembly performance of the front shell and inner screw cap in the second embodiment can be found in [reference needed]. Figure 10 and Figure 11 In this embodiment, the elastic deformation capability of the locking block 210 is increased by changing the structural design of the face shell 200A. Gaps 231 and 232 are provided on both sides of the side wall of the face shell 200A that supports the locking block 210. The principle of this design is similar to... Figure 3 The design principle of the shown shell is the same, so it will not be repeated here. As mentioned earlier, Figure 10 and Figure 11 The shell structure shown has limitations in its design due to the presence of gaps. To solve this problem, Figure 12 A modified embodiment of the face shell 200B is provided, the design principle of which is the same as... Figure 4 The same as the shown shell, that is, the inner wall of the shell 200B has a number of grooves 200G corresponding to the locking blocks 210. The locking blocks 210 are disposed on the elastic sheet 202, and there is a gap between the elastic sheet 202 and the two sides of the grooves 200G. The design of the grooves 200G constructs a hidden elastic locking block 210 structure, while the plasticity of the appearance of the shell 200B is preserved. Optimizing the detachable performance of the shell and the inner screw cap in the second embodiment, in addition to strengthening the elastic deformation ability of the locking blocks or the separation grooves respectively, can also simultaneously strengthen the elastic deformation ability of both. Figure 9 The inner screw cap shown can be used with Figure 10 or Figure 12 The faceplate shown is used in conjunction with the other faceplates.

[0155] Please refer to the reference. Figures 13 to 15 Preferably, as a third embodiment of a screw cap structure that facilitates assembly and disassembly, the same judgment criteria as the second embodiment are adopted. In this embodiment, the equivalent rotation direction of the first helical surface is clockwise. Assuming that the tightening direction of the fastening device used in the inner screw cap of this embodiment is the same as the tightening direction of the fastening device in the second embodiment, then the tightening direction of the inner screw cap 100 is the same as the equivalent rotation direction of the first helical surface. When an external force is applied to the face shell 200 to engage the inner screw cap 100, the inner screw cap 100 remains stationary, while the face shell 200 simultaneously performs a rotational movement along the tightening direction and a linear movement along the axial direction until the locking block 210 is locked into the locking part 110. Specifically, please refer to Figure 15 Referring to the above description of the second embodiment of the screw cap structure that is easy to assemble and disassemble, in this embodiment, the assembly guide 120 and the guided part 220 are respectively described using a helical surface as an example. Here, the inclined surface refers to the tangent plane of the helical surface at the contact point (force analysis point).

[0156] When a downward axial pressing force F is applied to the faceplate, under the combined action of gravity G1, pressing force F, reverse support force P, and frictional force f, the movement of the faceplate (guided part 220) includes downward axial movement and clockwise rotation. Similarly, based on the force analysis in the first embodiment, the inner screw cap and assembly guide in this embodiment should rotate counterclockwise under the combined external force. However, in the practical application of this embodiment (similar to...), Figures 31 to 33In any of the shown lacing devices, the counterclockwise direction is the direction for loosening the lacing, i.e., the direction in which rotation is prevented during the winding lacing mode. In the winding lacing mode, because the inner screw cap 100 cooperates with the anti-reverse mechanism, the inner screw cap 100 can only rotate relative to the housing in the tightening direction and cannot rotate in the loosening direction, which is opposite to the tightening direction. Therefore, the counterclockwise rotation of the inner screw cap is prevented by the anti-reverse mechanism, such as... Figure 15 As shown, at this time, the anti-reverse mechanism applies a lateral force Fc to the inner screw cap (assembly guide 220), preventing the inner screw cap from rotating counterclockwise. Therefore, in this embodiment, with the inner screw cap 100 remaining stationary, the face shell 200, guided by the sliding of the assembly guide 120 under the guidance of the guide 220, can rotate relative to the inner screw cap 100 in the tightening direction while simultaneously moving axially along the central axis of the inner screw cap 100 and moving downwards towards the bottom end away from the inner screw cap 100 (spiral movement along the assembly guide). This ensures that the inner screw cap 100 is not caused to rotate in the loosening direction, thus reducing the tightening degree of the strap, while allowing the locking block 210 to move to the alignment position of the locking part 110. Under the further action of the pressing force F, the elastic deformation generated by the interaction between the locking block 210 and the locking part 110 achieves a tight connection between the locking block 210 and the locking part 110, achieving the purpose of precise assembly of the face shell 200 and the inner screw cap 100.

[0157] Figures 13 to 15 In the screw cap structure embodiment shown, the shell moves very slowly by relying solely on the pressing force F, so in practical applications (similar to...) Figures 31 to 33 In order to improve the user experience, in any of the strap devices shown, the user needs to apply a pressing force F and a clockwise torque M to cause the faceplate to move in a spiral motion and speed up the process of the faceplate engaging with the inner screw cap.

[0158] Please refer to the reference. Figures 16 to 18Preferably, as a fourth embodiment of the screw cap structure for easy assembly and disassembly, the assembly guide portion 120 includes two sub-guide portions 1201 with opposite rotational directions, and the receiving guide portion 220 correspondingly includes two sub-receiving guide portions 2201 with opposite rotational directions. The two sub-guide portions 1201 can be two first helical surfaces 121, two first inclined surfaces 122, or a combination of one first helical surface 121 and one first inclined surface 122. Correspondingly, the two sub-receiving guide portions 2201 can be two second helical surfaces 221, two second inclined surfaces 222, or a combination of one second helical surface 221 and one second inclined surface 222. More preferably, the two sub-guide portions 1201 are located on the outer peripheral surface of the inner screw cap 100 and are mirror-symmetrical with respect to an outer axial line parallel to the central axis of the inner screw cap 100, and the two sub-receiving guide portions 2201 are mirror-symmetrical with respect to an inner axial line located on the inner peripheral surface of the face shell 200 and parallel to the central axis of the face shell 200. In this embodiment, both the two guide portions 1201 and the two receiving portions 2201 are described using inclined surfaces as an example. Therefore, when an external force is applied to the faceplate 200, the faceplate 200 is snapped inward and screwed onto the cover 100, and one of the two receiving portions 2201 slides along one of the two guide portions 1201 with which it slides. It is understood that the assembly guide portion 120 in this preferred embodiment is a combination of the assembly guide portions 120 in the second and third embodiments described above. Both the assembly guide portion 120 and the receiving portion 220 are "mountain" shaped, with the vertices of the "mountain" shape facing each other. The receiving portion 220 is guided downward by the side of the assembly guide portion 1201 whose vertices fall onto the vertices of the receiving portion 1200. Compared to the two embodiments described above, the spiral surface and inclined surface in this embodiment are steeper, allowing for a faster and more efficient locking connection between the locking block 210 and the locking part.

[0159] The fourth embodiment is not limited to Figure 16 and Figure 17 The two sub-guides 1201 and two sub-guides 2201 shown constitute a mirror-symmetric structure. When the guided portion faces the assembly guide, the two sub-guides of the guided portion and the two sub-guides of the assembly guide can slide and engage respectively. Typically, the sub-guides and sub-guides that slide and engage coincide after two axial symmetries, and these two axes of symmetry are perpendicular to each other. In other words, the sub-guides and sub-guides that slide and engage form a translational relationship. Specifically, as shown... Figure 18As shown, the assembly guide 120 includes two sub-guides 12011 and 12012 with opposite rotational directions. Correspondingly, the receiving guide 220 also includes two sub-receiving guides 22011 and 22012 with opposite rotational directions. The sub-receiving guides 22011 and 12012 are configured as sliding inclined surfaces, overlapping after being folded along axes of symmetry L11 and L12. The intersection of L11 and L12 is the vertex T of either the two sub-guides or the two sub-receiving guides. Therefore, the sub-receiving guide 22011 can mate with the sub-guide 12012 after translation. The sub-receiving guide 22012 and 12011 are configured as sliding helical surfaces, overlapping after being folded along axes of symmetry L11 and L12. Therefore, the sub-receiving guide 22012 can mate with the sub-guide 12011 after translation.

[0160] Please refer to the reference. Figures 5 to 23 Preferably, the inner screw cap includes multiple assembly guides and multiple locking parts, with a locking part between each pair of adjacent assembly guides. The outer shell has multiple locking blocks, the same number as the locking parts. In this way, when an external force is applied to the outer shell to engage the inner screw cap, the multiple assembly guides and the multiple guided parts slide and engage simultaneously, and the multiple locking blocks align and engage with the multiple locking parts respectively, which can improve the speed and reliability of assembling the outer shell and the inner screw cap.

[0161] Please refer to the reference. Figures 5 to 15 Each pair of adjacent assembly guides 120 and snap-fit ​​parts 110 forms an assembly unit; such as Figures 16 to 18 As shown, an assembly guide 120 and two adjacent snap-fit ​​parts 110 form an assembly unit, and the two adjacent assembly units share a snap-fit ​​part 110. Multiple assembly units are provided on the inner screw cover 100, and these multiple assembly units are continuously and evenly arranged around the outer peripheral surface of the inner screw cover 100. In this way, when the faceplate 200 is fastened to the inner screw cover 100 from any angle above it, the snap-fit ​​block either directly aligns with the snap-fit ​​part or is guided to the position aligned with the snap-fit ​​part by the cooperation of the guide and the assembly guide. On the other hand, the axial movement of the faceplate 200 towards the inner screw cover 100 is smoother and more uniform in speed, making the axial movement of the faceplate 200 essentially translational and less prone to deflection. Preferably, the assembly units can be 3 or 6, for example, Figures 19 to 20 A fifth embodiment of the screw cap structure, which facilitates assembly and disassembly, is shown, with three assembly units. Figures 5 to 18The second to fourth embodiments of the swivel cap structure shown, which facilitate assembly and disassembly, all employ six assembly units. Furthermore, the number of assembly units need not be less than two and must be able to evenly divide the 360° area. The firmness of the connection between the locking block 210 and the locking portion 110 is positively correlated with the number of assembly units, but an excessive number will increase manufacturing costs. Therefore, in the preferred embodiment of this invention, six assembly units are used.

[0162] Figure 21 This is a schematic diagram of the assembly of the inner screw cap and the anti-reverse mechanism of this utility model. Figure 21 The anti-reverse mechanism shown includes a first anti-reverse component ratchet 101 and a second anti-reverse component elastic pawl 401. The elastic pawl 401-ratchet 101 mechanism, acting as an anti-reverse mechanism, determines the tightening and loosening directions of the cap structure. Specifically, the arrows in this embodiment indicate the tightening direction (counterclockwise from a bottom view), and the loosening direction is opposite to the tightening direction (clockwise from a bottom view). This is consistent with the tightening and loosening directions of the lacing device used in the cap structure mentioned above. This anti-reverse mechanism is applicable to any of the above-mentioned cap structures that are easy to assemble and disassemble. Furthermore, the anti-reverse mechanism in this utility model is not limited to the elastic pawl-ratchet mechanism. Any mechanical structure that can achieve the function of preventing reverse reversal is acceptable. For example, the anti-reverse mechanism applicable to this patent includes, but is not limited to, the anti-reverse mechanisms disclosed in patents CN216256587U, CN215837385U, CN 215423119U, CN221662582U, CN216723374U, and CN208993976U.

[0163] For a structure where assembly units are continuously distributed along the outer periphery of the inner screw cap, after the faceplate and inner screw cap are engaged, in order to separate the faceplate from the inner screw cap via a separation groove by rotating the faceplate in the loosening direction, the separation groove corresponding to the engagement part and performing the separation function must be located on the loosening direction side of the engagement part. Therefore, the separation groove corresponding to the engagement part and performing the separation function may be provided on the assembly guide part of the assembly unit where the engagement part is located, or it may be provided on the assembly guide part of an adjacent assembly unit. Please refer to the reference. Figure 7 and Figure 14Taking embodiments two and three of the screw cap structure for ease of assembly and disassembly as examples, preferably, the assembly guide 120 protrudes from the outer peripheral surface of the inner screw cap 100, and the separation groove 130 is formed on the side wall of the assembly guide 120. The separation groove axially penetrates part of the side wall of the assembly guide where it is located. This separation groove only penetrates axially, but does not penetrate the thickness direction of the assembly guide. Therefore, the surface on the first helical surface 121 or the first inclined surface 122 that slides in conjunction with the guided part remains continuous; only the width of the guide surface at the location of the separation groove becomes narrower. For the assembly guide including two sub-guides with opposite rotation directions in embodiment four of the screw cap structure, the separation groove is preferably located near the central axis of the assembly guide, i.e., passing through the apex of the assembly guide, and its width evenly spans the two sub-guides, such as... Figure 17 As shown. This design balances the guiding surfaces of the two sub-guides, ensuring a consistent feel regardless of which sub-guide the guided part slides along.

[0164] Example 2, a further improved screw cap structure for easier assembly and disassembly, is shown below. Figure 7As shown, the snap-fit ​​part 110 includes a snap-fit ​​surface 112, and an assembly groove 111 is provided above the snap-fit ​​surface. The snap-fit ​​block 210 includes a snap-fit ​​surface 211 that abuts against the snap-fit ​​surface 112. Therefore, the snap-fit ​​block 210 can move elastically in the axial direction under the guidance of the assembly groove 111, so that the snap-fit ​​surface 211 can reliably snap against the snap-fit ​​surface 112. The separating groove 130 includes a first groove surface 131 and a second groove surface 132, and a transition slope 133 between them. The first groove surface 131 intersects with the remaining first spiral surface 121 and / or the first inclined surface 122 that is not penetrated by the groove. The second groove surface 132 is connected to the first groove surface 131 via the transition slope 133 and intersects obliquely with the outer peripheral wall of the inner spiral cap 100. The average depth of the first groove surface 131 is generally less than the depth of the second groove surface 132, and the second groove surface 132 extends radially from the opening end of the inner spiral cap towards the bottom in a gradually increasing manner, but with a very small inclination. In the axial upward direction, the first... The first groove surface 131 is radially inclined relative to the outer peripheral wall of the inner screw cap 100, while the transition slope surface is radially inclined relative to the outer peripheral wall of the inner screw cap. Therefore, the first groove surface 131 and the transition slope surface 133 form a wedge shape protruding relative to the outer peripheral wall of the inner screw cap 100. In this way, the first groove surface 131 can guide the locking block 210 to elastically and smoothly disengage from the separation groove 130. The second groove surface 132 is deep enough that when the locking block rotates from the locking part 110 to the position of the second groove surface 132, there is a noticeable drop and relaxation sensation, allowing the user to confirm that the locking block has rotated to the separation groove position. In other embodiments, the first groove surface 131 may also extend axially with a constant diameter, or the first and second groove surfaces may extend continuously with gradual protrusions (from the opening end of the inner screw cap to the bottom). All three methods can achieve the separation of the outer shell from the inner screw cap. However, by extending the first groove surface 131 with a constant diameter or by gradually narrowing and tilting it, the problem of excessively thick outer peripheral walls caused by directly extending the second groove surface 132 from the opening end of the inner screw cap to the bottom can be avoided, so the detachment effect will be smoother.

[0165] To further simplify the separation operation of the outer shell and the inner screw cap in this embodiment, preferably, as follows: Figure 22-25 In the sixth embodiment shown, an elastic element 150 may be provided between the face shell 200 and the inner screw cap 100A', which is a spring in this embodiment. At least one end of the elastic element 150 is connected to the face shell 200 or the inner screw cap 100A', and the connection method can be a fixed connection or a detachable connection. Fixed connections include methods such as adhesive bonding, and detachable connections include methods such as snap-fit ​​connections. Figure 23 and Figure 25 These are, respectively, full sectional front views of the assembled screw-top structures after one end of the elastic element 150 is connected to the face shell 200 in different ways; that is, schematic diagrams taken along the front and rear sections of the symmetrical face. Figure 23 and Figure 25One end of the middle spring 150 is bonded to the faceplate; Figure 25 One end of the spring 150 is connected to the faceplate 200 via a snap-fit ​​mechanism. Specifically, a slot 240 is provided in the center of the faceplate 200, and the spring coil at one end of the spring 150 is snapped into the slot 240. More preferably, the spring is a compression spring. When the faceplate 200 and the inner screw cap 100A' are assembled together, the spring 150 is in a compressed state and stores elastic potential energy. When the faceplate and the inner screw cap need to be separated, the faceplate is rotated to the separation groove position. Under the action of the spring's restoring force, the faceplate moves axially away from the inner screw cap, causing the faceplate to separate from the inner screw cap along the separation groove. This reduces the external force applied by the user to separate the faceplate, or even eliminates the need for external force, as the faceplate can detach from the inner screw cap on its own, further simplifying the faceplate replacement operation. In other preferred embodiments, one end of the spring 150 can also be connected to the inner screw cap. In all embodiments of this invention with a separation groove, an elastic element can be provided between the faceplate and the inner screw cap to provide the force for separating the faceplate and the inner screw cap. The inner screw cap 100A' in this embodiment and Figure 9 The inner screw cap 100A shown has a basically the same structure. The only difference is that another assembly guide segment adjacent to the assembly guide segment where the separation groove 130A is located also has a partial groove. The depth of this groove matches that of the separation groove and can be regarded as an extension of the separation groove in the circumferential direction. This structure provides a certain degree of leeway for the circumferential movement of the locking block in the separation groove.

[0166] in addition, Figure 26 and Figure 27 A seventh embodiment of the screw cap structure, which facilitates assembly and disassembly, is shown. This embodiment does not have a separation groove. In this case, when it is necessary to separate the outer shell 200 from the inner screw cap 100, a tool can be used to pry open the locking block 210 to separate them. Because this embodiment lacks a separation groove, it reduces the convenience of replacing the outer shell, making it particularly suitable for screw cap structures where the outer shell is replaced infrequently.

[0167] Furthermore, to enhance the aesthetic appeal of the screw-on cap structure, the faceplate of any of the above embodiments may be integrally molded with a decorative structure. For example... Figure 28 As shown, the faceplate 200' itself has a certain aesthetic design, with a simple structure that meets the aesthetic needs of some user groups. The design of the one-piece molded faceplate 200' with decorative structures is not limited to... Figure 28 The design shown. The faceplate 200' can be made of metal, hard plastic, soft rubber, etc.

[0168] Since directly forming a certain decorative structure on the shell has great limitations, in order to meet the user's diverse appearance design needs for the screw cap structure, the screw cap structure may further include a decorative element 300, which can be linked and connected with the shell 200.

[0169] Decorative components can be constructed in various styles and structures, such as three-dimensional cartoon figures, three-dimensional animal figures, floral shapes, or three-dimensional plant figures. They can also be aesthetically pleasing epoxy resin sheets or decorative light-emitting chips, and their corresponding structures can be set in irregular patterns. For example... Figure 29 The "flower" shape shown allows for greater diversity in the overall appearance of the screw cap structure through different configurations of decorative elements. Specifically, Figure 29 and Figure 30 The floral-shaped decorative piece shown is made using a drip molding process. Drip molding allows the material to be shaped and structured as needed while in a viscous state, and then cured at room temperature. This process makes it more comfortable to grip than hard plastic, provides better damping during use, reduces slippage, and is easier and simpler to process. Furthermore, other decorative pieces can be formed using injection molding, hollowing, carving, painting, polishing, and other techniques. The materials used for the decorative pieces are not limited to soft rubber, metal, or hard plastic.

[0170] Figure 29 and Figure 30 In the illustrated embodiment, the faceplate 200 and the decorative element 300 can be connected and fixed by adhesive to achieve a linkage connection between the decorative element 300 and the faceplate 200. Preferably, adhesive grooves 201 are provided on the side walls and bottom surface of the faceplate 200. The design of the adhesive grooves 201 allows for all-around bonding and fixing between the decorative element 300 and the faceplate 200, resulting in good adhesive effect and stronger reliability; the disadvantage is that the decorative element cannot be replaced. Of course, adhesive grooves can also be provided only on the bottom or side walls of the faceplate, which slightly reduces the reliability of the bonding, but can still provide a reliable connection for certain shaped decorative elements. Figures 1 to 27 The shown shell or its simple variants can be connected to decorative parts. It is worth mentioning that... Figure 3 , Figure 10 and Figure 11 The surface shown has a first gap 231 and a second gap 232. When gluing, the glue tends to overflow from the gaps, causing unnecessary trouble.

[0171] Of course, in other preferred embodiments, the faceplate and decorative parts can also be fixedly connected by a detachable method, including but not limited to one or more combinations of snap-fit ​​connection, magnetic connection, threaded connection, interference fit, and embedded fit, so that when using different styles of decorative parts, the decorative parts can be quickly disassembled and replaced, and the operation is simpler and more convenient during assembly, with higher adaptability.

[0172] As another objective of this utility model, it also provides a strapping device, such as... Figures 31-33As shown, the device includes a spool 500, housings 400 and 400', and a screw-on cap structure facilitating assembly and disassembly according to any of the above embodiments. The screw-on cap structure is rotatably mounted on the housings 400 and 400'. The spool 500 is configured to wind up the strap when rotating in the tightening direction and release the strap when rotating in the loosening direction. The strap mechanism has a winding strap mode in which the inner screw-on cap can only rotate relative to the housing in the tightening direction. When an external force is applied to the outer shell to assemble it onto the inner screw-on cap, the locking block, under the action of the assembly guide, can move from a misaligned position at least partially offset from the locking portion to an aligned position facing the locking portion, thereby aligning and engaging the locking portion, thus enabling a linkage connection between the outer shell and the inner screw-on cap. Figure 31 The screw cap structure in the middle adopts Figure 1 The screw cap structure shown, Figure 32 The screw cap structure in the middle adopts Figure 28 The faceplate shown is 200'. Figure 33 use Figure 30 The screw cap structure is shown. The strapping device provided by this utility model has anti-reverse mechanisms correspondingly provided on the inner screw cap and the shell. The anti-reverse mechanisms ensure that the strapping device can only rotate in the tightening direction when in the winding strapping mode. Figures 31 to 33 In any of the embodiments shown, the tightening direction of the strap device is clockwise, and the loosening direction is counterclockwise (from a top view). Figure 21 The diagram shows a bottom view illustrating the assembly of the inner rotating cap with the pawl 401 and ratchet 101. Figures 1 to 30 In any of the screw cap structures shown that are easy to assemble and disassemble, when applied to the strap device of this embodiment, the relative movement of the front shell and the inner screw cap during assembly is consistent with the screw cap structure described in the foregoing embodiments in practical application.

[0173] When the lacing device includes Figures 1 to 4 In the screw-on cap structure shown, the locking block 21 can be directly aligned and engaged with the locking part 102, or it can slide along the unit assembly guide 12L or 12R to the position of the locking part 102 before engaging with it. With this type of screw-on cap structure, the assembly of the outer shell 20 and the inner screw cap 10 is not a completely precise alignment and engagement. That is, the locking block on the outer shell 20 does not need to be precisely aligned with the locking part 102 on the inner screw cap 10. The locking block only needs to move downwards within the tolerance space radiated by the locking part 102 to directly engage with the corresponding locking part, or after a certain sliding, thus achieving the assembly of the outer shell and the inner screw cap.

[0174] When the lacing device includes Figures 5 to 27When the screw cap structure is shown, and the assembly unit consisting of the assembly guide and the snap-fit ​​part is identical, uniform, and continuously surrounds the outer circumference of the inner screw cap, and the snap-fit ​​blocks on the outer shell and the snap-fit ​​part of the inner screw cap are required to have the same structure, then no matter where the outer shell is snapped off from above the inner screw cap, the snap-fit ​​blocks will directly or be guided to the aligned position of the snap-fit ​​part, and thus lock tightly connected with the snap-fit ​​part. Therefore, this structural design can achieve a completely non-precise alignment and snap-fit ​​connection between the outer shell and the inner screw cap, that is, the outer shell can be dropped and snapped onto the inner screw cap from all 360° omnidirectional angles without prior alignment or foolproof design, simplifying the assembly process of the outer shell and the inner screw cap. Of course, for structures with multiple snap-fit ​​blocks, such as those with different sizes or shapes, a certain snap-fit ​​block can only snap onto a specific snap-fit ​​part. In this case, the outer shell and the inner screw cap also belong to the type of non-completely precise alignment and snap-fit. Regarding the fastening operation, specifically, when the rotation direction of the assembly guide 120 is the same as the tightening direction, when an external force is applied to the face shell 200, the inner screw cap 100 remains stationary while the guide 220 slides along the assembly guide 120, and the face shell 200 simultaneously performs a rotational motion along the tightening direction and a linear motion along the axial direction (a spiral motion along the assembly guide) until the locking block 210 is locked into the locking part 110; when the rotation direction of the assembly guide 120 is opposite to the tightening direction, an external force is applied to the face shell 200... When the external force is applied, the guide part 220 slides along the assembly guide part 120 while the inner screw cover 100 rotates along the tightening direction, and the face shell 200 moves axially until the locking block 210 is locked with the locking part 110. Therefore, regardless of whether the equivalent rotation direction of the assembly guide part is the same as or opposite to the tightening direction, the face shell 200 has axial movement or axial partial movement until the locking block 210 is locked with the locking part 110. Thus, when assembling the face shell 200 of the fastening device, the face shell 200 and the inner screw cover 100 can be quickly and linked together.

[0175] For a further preferred embodiment, please refer to the reference. Figures 1 to 21 The inner cap also has a separation groove 130, which is offset from the latching parts 102 and 110 circumferentially and located on one side of the release direction of the latching parts 102 and 110. Therefore, when removing the existing cover to replace the fastening device cover, the cover and inner cap can be quickly separated by the rotation method described above and the separation groove 130, satisfying the user's personalized aesthetic needs for the cap structure and the fastening device. The separation groove allows for tool-free separation of the cover and inner cap; coupled with the structural design of the assembly guide, precise alignment and fastening are not required for assembling the cover and inner cap. In particular, as... Figures 22 to 25The screw-on cap structure shown further optimizes the separation operation of the outer shell and the inner screw-on cap. Preferably, an elastic element 150 is provided between the outer shell and the inner screw-on cap. Utilizing the elastic restoring force of the elastic element 150, the user can separate the outer shell and the inner screw-on cap without applying external force or with very little external force. Therefore, the disassembly and assembly operations of the outer shell in the screw-on cap structure provided by this utility model are simplified; without special tools and skills, users can easily replace the outer shell with their desired one, meeting users' needs for diverse appearances of the strap device.

[0176] Further optimized, when the inner cap rotates the outer shell in the loosening direction and the outer shell is quickly separated from the inner cap using the separation groove, to prevent the anti-reverse component from shifting axially due to uneven force on the outer shell, thus preventing structural damage to the anti-reverse component, a limiting part is also provided on the inner cap or shell. This limiting part restricts the axial displacement of the anti-reverse component, thereby ensuring the reliability, stability, and durability of the structure. See details below. Figure 31 , Figure 33 and Figure 34 In the embodiment shown, the anti-reverse mechanism adopts a gear tooth-offset member 401'-stop member 402' structure, wherein the gear tooth is the first anti-reverse member, the offset member 401' is the second anti-reverse member, and multiple offset members 401' form an anti-reverse tooth ring 40. (See gear tooth for reference...) Figure 21 The ratchet 101 shown is disposed on the inner screw cap, and the offset member 401' and the stop member 402' are fixedly disposed on the housing 400'. The stop member 402' has a check head to prevent the offset member from shifting in the loosening direction, thereby preventing the inner screw cap and the winding drum from rotating in the loosening direction. The specific structure of the gear tooth-stop member-offset member and the anti-reverse mechanism can be found in patent CN202410035435.3. The assembly structure of the offset member 401'-stop member 402' and the housing in patent CN202410035435.3 is as follows. Figure 35 As shown, the main projection line L1 of the side wall of the stop-return section in this patent is parallel or collinear with the axial direction L of the inner screw cap. Therefore, the stop head of the offset member can only prevent the head of the offset member from shifting in the release direction, but cannot restrict the head of the offset member from shifting axially. When the shell is rotated in the release direction to separate it from the inner screw cap, since the offset member is engaged with the ratchet (or groove) on the inner screw cap, the shell is subjected to unbalanced external forces, causing friction on the meshing surface. The friction on the meshing surface causes the offset member to be driven to lift up, thereby damaging the structure of the second stop-return member. To avoid damage to the offset member due to lifting up, such as Figure 34 , Figures 36-37As shown, the stop member 402' has a stop head configured as a stop limiting part 403, and the main view projection line L1 of the side wall of the stop limiting part 403 is inclined relative to the axial direction L of the inner screw cover and the included angle is an acute angle; correspondingly, the neck joint of the offset member is configured as a neck joint protrusion 404, and the main view projection line L2 of the side wall of the neck joint protrusion 404 is also set to be inclined relative to the axial direction L of the inner screw cover.

[0177] The check valve 403 and the neck protrusion 404 of the offset member form a force lock in the axial direction. For example... Figure 38 As shown, when the faceplate is subjected to an unbalanced external force, causing the ratchet to move upward, the friction between the ratchet and the meshing surface of the offset member causes the offset member to move upward. When the neck protrusion 404 of the offset member 401' is subjected to an upward frictional force and tends to produce an axial upward displacement, the stop member's backstop limit portion 403 applies a force F perpendicular to the inclined plane and downward to the neck protrusion 404. 压 The force F 压 It has a vertically downward component force F1, which is used to balance the upward frictional force on the engagement teeth of the offset member, thereby limiting the upward displacement of the neck protrusion 404 (that is, the offset member) along the axial direction L, and thus preventing the offset member from being structurally damaged due to upward tilting.

[0178] In other embodiments of the anti-reverse mechanism, the second anti-reverse component is not limited to the aforementioned elastic pawl and offset component. Any component in the anti-reverse mechanism with strong deformation capacity or capable of offsetting during use can constitute the second anti-reverse component, such as a pawl, offset component, swing arm, or pin, etc. Since the second anti-reverse component is prone to warping and damage under upward external force, a limiting part can be provided on the housing or inner screw cover where the pawl or offset component is located. The function of the limiting part is to restrict the axial displacement of the pawl or offset component relative to the housing or inner screw cover it is located. For example, Figures 33 to 34 In the illustrated embodiment of the tethering device, the offset member 401' is fixed to the housing 400'. When the housing is reversed relative to the inner rotating cover, the offset member 401' is easily damaged by being driven upwards by the ratchet on the inner rotating cover due to friction. Therefore, the function of the limiting part is to restrict the axial displacement of the offset member 401' relative to the housing 400', so that the offset member 401', especially the engaging head of the offset member 401', can always remain close to the upper surface of the housing 400' and will not be lifted upwards, thereby avoiding structural damage. Similarly, if the offset member is provided on the inner rotating cover, then the function of the limiting part is to restrict the offset member from being driven downwards by friction, thereby avoiding structural damage.

[0179] Furthermore, the structural form of the limiting part is not limited to... Figure 34 The structure shown, Figure 34The shown check valve and limiting part functions to both prevent reverse rotation and limit the axial displacement of the offset component, integrating multiple functions and simplifying the structure of the tethering device. However, in other embodiments, the limiting part can also limit the axial displacement of the second check valve mechanism by shape locking. For example, the limiting part can be an independent transverse tab or other structure, as long as it can limit the axial displacement of the check valve mechanism relative to the inner screw cap or outer shell where it is located.

[0180] Of course, the strapping device used in the screw cap structure provided by this utility model is not limited to... Figures 31 to 33 The embodiments shown are not limited to clockwise tightening of the strap device. Even if the tightening directions are different, the principle of achieving the function of the screw cap structure, which is easy to assemble and disassemble, 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.

[0181] The lacing device can be used to fasten items, such as shoes, clothing, hats, bags, and various other types of bags. Using the aforementioned lacing device, along with other components like a lacing guide, the lacing can be tightened to close the opening. The lacing device achieves the beneficial effects of any easily assembled and disassembled screw-on cap structure, which will not be elaborated further here. Therefore, the assembly of the outer shell and inner screw-on cap of this utility model's lacing device is quick and precise, and users can easily replace the outer shell relative to the inner screw-on cap according to their aesthetic preferences. This embodiment of the lacing device also includes a base component 600 for fixing the main body of the lacing device onto the item to be fastened.

[0182] Furthermore, the application of the aforementioned easy-to-assemble and disassemble cap structure is not limited to the field of strap devices. It is applicable to any mechanical structure or product with a cap or screw cap, and to snap-fit ​​and disassembly systems that do not require precise alignment for installation.

[0183] 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 screw-on cap structure that is easy to assemble and disassemble, comprising an inner screw-on cap and a outer shell, the outer shell being detachably mounted on the outside of the inner screw-on cap, the outer shell having a locking block, and the inner screw-on cap having a locking portion, the locking block and the locking portion being locked together to enable a linkage connection between the outer shell and the inner screw-on cap; characterized in that, An assembly guide is provided on the inner rotating cover; The locking block can be directly engaged with the locking part at the alignment position of the locking part; or Under the action of the assembly guide, the locking block moves from a misaligned position that is at least partially offset from the locking part to an aligned position of the locking part, thereby locking the locking block and the locking part into a tight connection.

2. A screw-on cap structure that is easy to assemble and disassemble, comprising an inner screw-on cap and a outer shell, the outer shell being detachably mounted on the outside of the inner screw-on cap, the outer shell having a locking block, and the inner screw-on cap having a locking portion, the locking block and the locking portion being locked together to enable a linkage connection between the outer shell and the inner screw-on cap; characterized in that, The inner screw cap is provided with an assembly guide portion that is inclined relative to the rotation axis of the inner screw cap. The assembly guide portion has a proximal end near the bottom of the inner screw cap and a opposite distal end. The alignment position of the snap-fit ​​portion is adjacent to the distal end of the assembly guide portion. The locking block can be moved to the alignment position of the locking part under the action of the assembly guide, and then the locking block is locked and connected with the locking part.

3. The twist-off cap structure according to claim 1 or 2, wherein The faceplate is provided with a plurality of locking blocks, the same number as the locking parts; each locking part corresponds to an assembly guide pair, the assembly guide pair includes two unit assembly guides, each unit assembly guide has a proximal end near the bottom of the inner screw cap and a opposite distal end, and the alignment position of the locking part is adjacent to the distal end of each unit assembly guide in the assembly guide pair.

4. The screw cap structure for easy assembly and disassembly according to claim 3, characterized in that, Both of the unit assembly guides have inclined surfaces, and the inclination directions of the two unit assembly guide pairs are symmetrical about the axial direction of the inner screw cap.

5. The twist-off cap structure according to claim 1 or 2, wherein The faceplate is provided with a guided part that cooperates with the assembly guide part. The locking block can move to the alignment position of the locking part under the cooperation of the assembly guide part and the guided part, and then the locking block is locked and connected with the locking part.

6. The twist-off cap structure according to claim 5, wherein The guided part and the locking block are integral structures. The locking block includes a locking surface that abuts and locks against the locking part. The guided part is located on the opposite side of the locking surface. The locking block can move along the assembly guide to the alignment position of the locking part, and then the locking block and the locking part are locked together.

7. The twist-off cap structure according to claim 5, wherein The mating surfaces of the assembly guide and the guided part are constructed as helical surfaces, inclined surfaces, or irregular surfaces. The irregular surfaces are different helical surfaces, different inclined surfaces, or a combination of helical surfaces and inclined surfaces. The helical surfaces, inclined surfaces, and irregular surfaces all have a proximal end near the bottom of the inner spiral cover and a relatively distal end, and the assembly guide and the guided part both have the same direction of rotation.

8. The twist-off cap structure according to claim 5, wherein The assembly guide includes a spiral surface or an inclined surface, and the guided part correspondingly includes a spiral surface or an inclined surface; when an external force is applied to the shell, the guided part can slide along the spiral surface or the inclined surface.

9. The screw cap structure for easy assembly and disassembly according to claim 1 or 2, characterized in that, The inner rotating cover includes multiple assembly guides and multiple snap-fit ​​parts, and the face shell is provided with multiple snap-fit ​​blocks in the same number as the snap-fit ​​parts; the multiple snap-fit ​​blocks are of the same size, or the multiple snap-fit ​​blocks are of different sizes.

10. The twist-off cap structure according to claim 1 or 2, wherein The inner screw cap is also provided with a separation groove, which is located on the outer circumferential surface of the inner screw cap and is offset from the latching part along the circumferential direction of the inner screw cap; the outer shell can also rotate relative to the inner screw cap to rotate the latching block from the latching part position to the separation groove position, and separate the outer shell from the inner screw cap through the separation groove.

11. The twist-off cap structure according to claim 10, wherein The separation groove is provided in multiple ways, and each separation groove corresponds to a snap-fit ​​part.

12. The twist-off cap structure according to claim 10, wherein The inner rotating cover is also provided with a rotation transition part, which is located between the snap-fit ​​part and the separation groove, and is used to guide the snap-fit ​​block to rotate from the snap-fit ​​part to the separation groove.

13. The twist-off cap structure according to claim 1 or 2, wherein The sidewall of the faceplate has a slit, and at least one side of the card block is adjacent to the slit.

14. The twist-off cap structure according to claim 1 or 2, wherein The inner wall of the faceplate has a number of grooves corresponding to the number of the locking blocks. The locking blocks are disposed on the elastic sheet, and there is a gap between the elastic sheet and the two sides of the grooves.

15. The twist-off cap structure according to claim 10, wherein The separation groove is disposed on the side wall of the assembly guide, the assembly guide includes a plurality of assembly guide segments, wherein at least one assembly guide segment with a separation groove has a radial gap with the side wall of the inner screw cap.

16. The twist-off closure structure of any one of claims 1 to 15, wherein The outer shell is integrally formed with a decorative structure; or the screw cap structure that is easy to assemble and disassemble further includes a decorative component, which can be linked to the outer shell.

17. A lacing device, comprising: The device includes a spool, a housing, and a screw cap structure for easy assembly and disassembly as described in any one of claims 1-16, wherein the screw cap structure is rotatably disposed on the housing, the spool is configured to wind up the strap when rotated in a tightening direction and release the strap when rotated in a loosening direction; the strap device has a winding strap mode in which the inner screw cap can only rotate relative to the housing in the tightening direction; when an external force is applied to the outer shell and the outer shell is assembled onto the inner screw cap, the locking block can move to the alignment position of the locking portion under the action of the assembly guide, thereby locking the locking block and the locking portion together.

18. The lacing device of claim 17, wherein, The faceplate is provided with a plurality of locking blocks, the same number as the locking parts. Each locking part corresponds to an assembly guide pair. The assembly guide pair includes two unit assembly guides. Each unit assembly guide is inclined relative to the rotation axis of the inner screw cap and has a proximal end near the bottom of the inner screw cap and a opposite distal end. The alignment position of the locking part is adjacent to the distal end of each unit assembly guide in the assembly guide pair.

19. The lacing device of claim 17, wherein, The faceplate is provided with a guided part that cooperates with the assembly guide part. The assembly guide part has a single equivalent rotation direction, and the guided part correspondingly has a single equivalent rotation direction.

20. The lacing device of claim 19, wherein, The assembly guide has an equivalent rotation direction opposite to the tightening direction; when a fastening force is applied to the face shell, the guided part slides along the assembly guide while the inner rotating cover rotates along the tightening direction until the locking block moves to the alignment position of the locking part, and then the locking block and the locking part are locked together.

21. The lacing device of claim 17, wherein, The inner screw cap is also provided with a separation groove, which is offset from the locking part along the circumference of the inner screw cap and is located on one side of the loosening direction of the locking part.

22. The lacing device of claim 21, wherein, An elastic element is provided between the outer shell and the inner screw cap, and the elastic element is connected to at least one of the outer shell and the inner screw cap; when the strapping device is in the winding strapping mode, the outer shell can rotate relative to the inner screw cap in the loosening direction to rotate the locking block from the locking part position to the separation groove position, and then the outer shell is separated from the inner screw cap via the separation groove by means of the restoring force of the elastic element.

23. The lacing device of claim 21, wherein, The strapping device further includes a backstop mechanism, which ensures that the inner screw cap can only rotate relative to the housing in the tightening direction during the winding strapping mode; the backstop mechanism includes a first backstop member and a second backstop member that cooperate with each other, and the first backstop member is a ratchet or a groove; the strapping device further includes a limiting part for limiting the axial displacement of the second backstop member.

24. The lacing device of claim 23, wherein, The limiting part and the second anti-reverse member are disposed on the same component of the belt device, and the limiting part and the second anti-reverse member form a force lock or shape lock to limit the axial displacement of the second anti-reverse member.

25. The lacing device of claim 23, wherein, The second anti-reverse component is one of a pawl, an offset component, and a swing arm.

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