Length-adjustable head particle structure, watchband and watch

Abstract

The utility model discloses a length-adjustable head particle structure, a watchband and a watch, and the structure comprises a first head particle, one end of which is provided with a slot, and the side wall of the slot is provided with a clamping groove; the second head particle is arranged in the slot and can move along the length direction of the first head particle, and the second head particle is provided with a spring bar; the key is connected to the side part of the first head particle in a springback manner; when the second head particle is driven to move to a first position in the direction away from the first head particle, the telescopic end of the spring bar extends and is clamped in the clamping groove, so that the first head particle and the second head particle are relatively fixed; when the button is pressed, the button drives the telescopic end of the spring bar to be separated from the clamping groove, so that the second head particle can move to a second position in the direction close to the first head particle. According to the utility model, the length of the watchband can be adjusted in a small range so as to obtain better wearing experience and a comfortable wearing effect.

Description

Technical Field

[0001] This utility model relates to the field of wearable device technology, and further to an adjustable length headstock structure, a watch strap, and a watch. Background Technology

[0002] With the rapid development of technology, various smart wearable devices are permeating all aspects of people's lives, bringing tremendous changes to their daily experiences. Wearable devices are not merely hardware devices; they achieve their powerful functions through software support, data interaction, and cloud interaction. Their applications are very broad, including healthcare, fitness, and communication. For example, watches are no longer limited to simply telling time. By embedding intelligent hardware and running a smartphone operating system connected to the network, they can perform various functions such as making calls, sending text messages, emails, viewing photos, and listening to music and videos. Smartwatches are an extension and expansion of smartphone functions, bringing great convenience to people's daily lives.

[0003] When wearing a smartwatch, the case should fit snugly against the wrist for a secure fit and improved wearing experience. However, traditional watch straps are generally divided into buckle straps and separate chain straps. Buckle straps require disassembly and reassembly for each length adjustment, which is cumbersome and results in a poor user experience. Separate chain straps, on the other hand, have fixed-length individual links, requiring users to purchase additional parts or remove excess links for adjustment. This process is complex and may not always achieve the desired length, impacting the performance of the smartwatch.

[0004] Therefore, the inventors hope to solve the technical problem of how to further adjust the length of the watch strap within a small range without affecting the original adjustment method, so as to obtain a watch strap with a better wearing experience and a comfortable wearing effect. Utility Model Content

[0005] To address the aforementioned technical problems, the purpose of this utility model is to provide an adjustable end piece structure, watch strap, and watch that can adjust the length of the watch strap within a small range to achieve a better wearing experience and a comfortable wearing effect.

[0006] To achieve the above objectives, this utility model provides a length-adjustable headstock structure, comprising:

[0007] The first lead has a slot at one end, and the side wall of the slot is provided with a groove;

[0008] The second headpiece is disposed in the slot and is movable along the length direction of the first headpiece. The second headpiece is provided with a spring ear.

[0009] A button is spring-loaded and attached to the side of the first head piece;

[0010] When the second headpiece is driven to move away from the first headpiece to the first position, the telescopic end of the spring ear extends and engages in the slot, so that the first headpiece and the second headpiece remain relatively fixed.

[0011] Pressing the button causes the retractable end of the spring ear to separate from the slot, allowing the second tip to move to a second position closer to the first tip.

[0012] In some embodiments, a button groove is provided on the side of the first tip, and the card slot is disposed at the bottom of the button groove;

[0013] The button includes a pressing section, a first elastic element, and a driving section. The pressing section is adapted to be disposed in the button slot. The first elastic element is disposed between the pressing section and the bottom of the button slot. The driving section is connected to the pressing section.

[0014] When the button is pressed, the drive section extends into the slot and drives the telescopic end of the spring ear to retract until it separates from the slot;

[0015] When the button is released, it returns to its original position under the elastic force of the first elastic element.

[0016] In some embodiments, the bottom of the button slot is further provided with a mounting hole, which is spaced apart from the card slot;

[0017] The button also includes a mounting post, which is fixed to the side of the pressing section near the driving section. The end of the mounting post is provided with a hook, and the mounting post is adapted to be inserted into the mounting hole. The hook engages with the mounting hole.

[0018] The first elastic element is elastic foam cotton. One side of the elastic foam cotton is bonded and fixed to the pressing section, and the other side is bonded and fixed to the bottom of the button groove.

[0019] In some embodiments, the first head piece is provided with a first limiting member disposed within the slot, the second head piece is provided with a second limiting member, and a second elastic member is disposed between the first limiting member and the second limiting member, the second elastic member being used to provide a driving force for the second head piece to move toward the first head piece.

[0020] In some embodiments, the second elastic member includes at least one spring, the first limiting member includes a limiting hook that is detachable or fixed to the bottom of the slot, the second limiting member includes a limiting groove, one end of the spring abuts against the limiting hook, and the other end abuts against the bottom of the limiting groove.

[0021] In some embodiments, the second elastic element includes two springs, two limiting slots are provided, the bottom of the slot is provided with a hook groove, the limiting hook includes a limiting hook body and a hook portion and two limiting platforms disposed on the limiting hook body, the hook portion is fixed in the hook groove by adhesive, the two limiting platforms are arranged at intervals, one end of the spring abuts against the limiting platform, and the other end abuts against the bottom of the corresponding limiting slot, so that the spring is compressed between the limiting platform and the bottom of the limiting slot.

[0022] In some embodiments, the second elastic member includes at least one spring, the first limiting member includes a first limiting stop fixed to the bottom of the slot, the second limiting member includes a second limiting stop detachably or fixed to the second head piece, one end of the spring abuts against the first limiting stop and the other end abuts against the second limiting stop.

[0023] In some embodiments, the second elastic element includes two springs, the first limiting stop is integrally formed with the first head piece, and the first limiting stop is provided with two first grooves;

[0024] The top of the second headpiece is provided with a decorative groove, a decorative plate is provided in the decorative groove, a fixing post is provided in the decorative plate, a fixing hole is provided at a corresponding position in the decorative groove, and the fixing post is adapted to be inserted into the fixing hole, so that the decorative plate is fixedly or detachably connected to the second headpiece. The second limiting stop is integrally provided with the decorative plate, and two second stop grooves are provided on the second limiting stop.

[0025] One end of the spring rests against the bottom of the first stop groove, and the other end rests against the bottom of the corresponding second stop groove, so that the spring is compressed between the bottom of the first stop groove and the bottom of the second stop groove.

[0026] In some embodiments, the second elastic element includes a torsion spring, and the first limiting element includes two spaced-apart stop posts, the two stop posts being fixed to the bottom of the slot;

[0027] The bottom of the second head is provided with a clearance groove, and the second limiting member includes a torsion spring post. The torsion spring post is fixed to the bottom of the clearance groove, and the torsion spring is adapted to be installed on the torsion spring post. The two ends of the torsion spring abut against the two stop posts respectively.

[0028] In some embodiments, the two side walls of the slot are respectively provided with slots, the second end piece is provided with a spring ear groove, the spring ear is fitted into the spring ear groove, and the telescopic end of the spring ear faces the two sides of the second end piece;

[0029] The first tip has button slots on both sides, and the two buttons are respectively located in the corresponding button slots.

[0030] According to another aspect of the present invention, the present invention further provides a watch strap, including the length-adjustable end link structure described in any one of the above, and further including:

[0031] Multiple surface particles are connected in sequence, and the second head particle is connected to the first surface particle;

[0032] Alternatively, a soft adhesive tape, wherein the second end piece is connected to the end of the soft adhesive tape.

[0033] According to another aspect of the present invention, the present invention further provides a watch, including the watch strap described above, and also including a watch body, the watch body being connected to the first head link.

[0034] Compared with the prior art, the adjustable end link structure, watch strap, and watch provided by this utility model have the following advantages:

[0035] The adjustable end link structure provided by this utility model is novel and ingenious. It can further realize automatic adjustment of the watch strap length within a small range without affecting the original adjustment method, thus achieving a better wearing experience and a more comfortable wearing effect. It also has the advantages of easy disassembly and assembly, convenient adjustment, and compatibility with traditional chain straps and soft rubber straps. Attached Figure Description

[0036] The preferred embodiments will be described below in a clear and easy-to-understand manner, in conjunction with the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages and implementation methods of this utility model.

[0037] Figure 1 This is a schematic diagram of the preferred embodiment of the adjustable headstock structure of this utility model;

[0038] Figure 2 This is a schematic diagram of the preferred embodiment of the present invention, showing the elongated state of the adjustable headstock structure.

[0039] Figure 3 This is a cross-sectional view of the length-adjustable headstock structure of a preferred embodiment of this utility model;

[0040] Figure 4 This is a schematic diagram of the structure of the first head piece in a preferred embodiment of this utility model;

[0041] Figure 5 This is an exploded schematic diagram of the length-adjustable head piece structure of a preferred embodiment of this utility model;

[0042] Figure 6 This is a schematic diagram of the structure of the limiting hook of the preferred embodiment of this utility model;

[0043] Figure 7 This is a schematic diagram of the structure of the adjustable head piece in another preferred embodiment of the present invention;

[0044] Figure 8 This is a cross-sectional view of another preferred embodiment of the present invention, featuring an adjustable-length headstock structure;

[0045] Figure 9 This is a schematic diagram of the structure of the first head piece in another preferred embodiment of this utility model;

[0046] Figure 10 This is a partial structural schematic diagram of the adjustable headstock structure of another preferred embodiment of the present invention;

[0047] Figure 11 This is a schematic diagram of the structure of the second head piece in another preferred embodiment of the present invention;

[0048] Figure 12 This is a schematic diagram of the structure of a decorative panel according to another preferred embodiment of the present invention;

[0049] Figure 13 This is a schematic diagram of the structure of the first head piece in another preferred embodiment of this utility model;

[0050] Figure 14 This is a schematic diagram of the structure of the second head piece in another preferred embodiment of the present invention;

[0051] Figure 15 This is a cross-sectional view of another preferred embodiment of the present invention, showing an adjustable headstock structure.

[0052] Explanation of icon numbers:

[0053] First end piece 1, slot 11, card slot 12, button slot 13, mounting hole 14, hook slot 15, first limiting member 16, limiting hook 161, limiting hook body 1611, hook part 1612, limiting card platform 1613, first limiting stop 162, first stop groove 1621, stop post 163, first connecting part 17, second end piece 2, spring bar groove 21, spring bar 211, second limiting member 22, limiting card slot 221, second limiting stop 222, torsion spring post 223, second elastic member 23, decorative groove 24, decorative plate 241, fixing post 242, buckle structure 243, fixing hole 244, second connecting part 25, clearance groove 26, button 3, pressing section 31, first elastic member 32, driving section 33, mounting post 34. Detailed Implementation

[0054] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0055] To keep the drawings concise, each figure only schematically shows the parts relevant to the utility model, and these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of the components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0056] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0057] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0058] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0059] In one embodiment, refer to the appendix to the specification. Figures 1 to 6 The present invention provides an adjustable length headstock structure, comprising: a first headstock 1, a second headstock 2, and a button 3. One end of the first headstock 1 forms a slot 11, and the side wall of the slot 11 is provided with a groove 12. The second headstock 2 is disposed in the slot 11 and can move along the length direction of the first headstock 1. The second headstock 2 is provided with a spring ear 211. The button 3 is spring-loaded and connected to the side of the first headstock 1. When the second headstock 2 is driven to move away from the first headstock 1 to a first position, the telescopic end of the spring ear 211 extends and is locked in the groove 12, so that the first headstock 1 and the second headstock 2 remain relatively fixed. When the button 3 is pressed, the button 3 drives the telescopic end of the spring ear 211 to separate from the groove 12, so that the second headstock 2 can move towards the first headstock 1 to a second position.

[0060] In this embodiment, the second end piece 2 is slidably disposed in the slot 11 of the first end piece 1. When the second end piece 2 moves away from the first end piece 1 to the farthest distance, that is, when the second end piece 2 is at its maximum extension position, the telescopic end of the spring bar 211 extends and is locked in the slot 12. The first end piece 1 and the second end piece 2 remain relatively fixed. This state makes it convenient for the user to wear or remove the watch. Pressing the button 3 causes the telescopic end of the spring bar 211 to separate from the slot 12, and the second end piece 2 moves towards the first end piece 1 until it reaches the closest distance. At this time, the second end piece 2 and the first end piece 1 are in a free sliding state, and the watch strap can be freely adjusted in length according to the thickness of the user's arm.

[0061] The novel and ingenious structure of this adjustable end link allows for automatic adjustment of the strap length within a small range without affecting the original strap adjustment method. This results in a better wearing experience and a more comfortable wearing effect. It also has the advantages of easy disassembly and assembly, convenient adjustment, and compatibility with traditional chain straps and soft rubber straps.

[0062] In one embodiment, refer to the appendix to the specification. Figures 1 to 6 The first protrusion 1 has a button groove 13 on its side, and a retaining groove 12 is located at the bottom of the button groove 13. The button 3 includes a pressing section 31, a first elastic element 32, and a driving section 33. The pressing section 31 is adapted to be disposed in the button groove 13, the first elastic element 32 is disposed between the pressing section 31 and the bottom of the button groove 13, and the driving section 33 is connected to the pressing section 31. When the button 3 is pressed, the driving section 33 extends into the retaining groove 12 and drives the telescopic end of the spring ear 211 to retract until it separates from the retaining groove 12; when the button 3 is released, the button 3 returns to its original position under the elastic force of the first elastic element 32.

[0063] Further, refer to the attached instruction manual. Figure 4 , Figure 5The bottom of the button slot 13 is also provided with mounting holes 14, which are spaced apart from the slot 12. The button 3 also includes a mounting post 34, which is fixed to the side of the pressing section 31 near the driving section 33. The end of the mounting post 34 is provided with a hook. The mounting post 34 is adapted to be inserted into the mounting hole 14, and the hook engages with the mounting hole 14. The mounting post 34 can also move back and forth within the mounting hole 14. The mounting post 34 not only serves as a fixing component but also as a guide. The first elastic component is elastic foam cotton. One side of the elastic foam cotton is bonded and fixed to the pressing section 31, and the other side is bonded and fixed to the bottom of the button slot 13. This structure not only has fewer parts but also a simple structure and is easy to assemble. It can also be adjusted after wearing by pulling the second head piece 2 and pressing the button 3 to retract it, making operation convenient and interactive.

[0064] Furthermore, slots 12 are provided on both sides of the slot 11, and spring bar slots 21 are provided on the second end link 2. There are two spring bar slots 21, and the two spring bars 211 are fitted into the corresponding spring bar slots 21, so that the telescopic ends of the spring bars 211 face the sides of the second end link 2. Button slots 13 are provided on both sides of the first end link 1, and two buttons 3 are respectively provided in the corresponding button slots 13. Each button 3 drives the telescopic end of the corresponding spring bar 211 to separate from the slot 12. The first end link 1 is provided with a first connecting part 17, which is located at the end of the first end link 1 away from the slot 11. The first connecting part 17 is used to connect with the watch body, watch strap, or watch links. The second end link 2 is provided with a second connecting part 25, which is located at the end of the second end link 2 away from the first end link 1. The second connecting part 25 is used to connect with the watch body, watch strap, or watch links.

[0065] It should be noted that the specific structure of button 3 is described with reference to the accompanying drawings in the instruction manual. In actual use, button 3 can also be set to other structures according to actual needs, as long as the above functions can be achieved. This is only for better illustration of the present invention and should not constitute a limitation on the present invention.

[0066] Reference manual attached Figure 3 The first head piece 1 is provided with a first limiting member 16, which is disposed in the slot 11. The second head piece 2 is provided with a second limiting member 22. A second elastic member 23 is disposed between the first limiting member 16 and the second limiting member 22. The second elastic member 23 is used to provide a driving force for the second head piece 2 to move closer to the first head piece 2.

[0067] For example, refer to the appendix to the instruction manual. Figures 3 to 6The second elastic element 23 includes at least one spring, and the first limiting element 16 includes a limiting hook 161, which is fixed to the bottom of the slot 11 by a hook structure and adhesive. The second limiting element 22 includes a limiting groove 221, with one end of the spring abutting against the limiting hook 161 and the other end abutting against the bottom of the limiting groove 221. Of course, the second elastic element 23 can also be an elastic post, etc.

[0068] Specifically, the second elastic element 23 includes two springs, two limiting slots 221 are provided, the bottom of the slot 11 is provided with a hook groove 15, and the limiting hook 161 includes a limiting hook body 1611, a hook part 1612 and two limiting platforms 1613 provided on the limiting hook body 1611. The hook part 1612 is fixed in the hook groove 15 by adhesive. The two limiting platforms 1613 are arranged at intervals. One end of the spring abuts against the limiting platform 1613, and the other end abuts against the bottom of the corresponding limiting slot 221, so that the spring is compressed between the limiting platform 1613 and the bottom of the limiting slot 221. By setting a double spring structure, the extension and retraction of the second head piece 2 is smoother and more stable.

[0069] In one embodiment, refer to the appendix to the specification. Figures 7 to 12 The specific structure and installation structure of button 3 are the same as those in the above embodiments, and will not be described in detail here. The difference between this embodiment and the above embodiments lies in the installation structure of the second elastic element 22, which will be explained in detail below.

[0070] The second elastic element 23 includes at least one spring, the first limiting element 16 includes a first limiting stop 162, which is fixed to the bottom of the slot 11, and the second limiting element 22 includes a second limiting stop 222, which is detachable or fixed to the second end piece 2. One end of the spring rests on the first limiting stop 162, and the other end rests on the second limiting stop 222. Of course, the second elastic element 23 can also be an elastic post, etc.

[0071] Specifically, the second elastic element 23 includes two springs. The first limiting stop 162 is integrally formed with the first end piece 1, and the first limiting stop 162 is provided with two first stop grooves 1621. The top of the second end piece 2 is provided with a decorative groove 24, and a decorative plate 241 is provided in the decorative groove 24. The decorative plate 241 is provided with a fixing post 242, and a fixing hole 244 is provided at a corresponding position in the decorative groove 24. The fixing post 242 is adapted to be inserted into the fixing hole 244. A snap-fit ​​structure 243 is also provided at the connection between the decorative plate 241 and the two sides of the decorative groove 24. The decorative plate 241 and the second end piece 2 are fixedly connected by the fixing post 242, the snap-fit ​​structure 243, and adhesive. The specific structure of the decorative plate 241 and the fixing post 242 can be set according to actual needs. Only the shape of the decorative groove 24 and the fixing hole 244 needs to be changed accordingly. The second limiting stop 222 is integrally formed with the decorative panel 241, and the second limiting stop 222 is provided with two second stop grooves; one end of the spring abuts against the bottom of the first stop groove 1621, and the other end abuts against the bottom of the corresponding second stop groove, so that the spring is compressed between the bottom of the first stop groove 1621 and the bottom of the second stop groove. By setting a double spring structure, the extension and retraction of the second head piece 2 is smoother and more stable.

[0072] In one embodiment, refer to the appendix to the specification. Figures 13 to 15 The specific structure and installation structure of button 3 are the same as those in the above embodiments, and will not be described in detail here. The difference between this embodiment and the above embodiments lies in the specific structure and installation structure of the second elastic element 22, which will be explained in detail below.

[0073] The second elastic element 22 includes a torsion spring, and the first limiting element 16 includes two spaced-apart stop posts 163, which are fixed to the bottom of the slot 11. The bottom of the second head piece 2 is provided with a clearance groove 26. The second limiting element 22 includes a torsion spring post 223, which is fixed to the bottom of the clearance groove 26. The torsion spring is adapted to be mounted on the torsion spring post 223. The torsion spring post 223 can be fixed with a hot melt plastic post, and the two ends of the torsion spring abut against the two stop posts 163 respectively.

[0074] It should be noted that the specific structure and installation structure of the second elastic element 22 are described with reference to the accompanying drawings. In actual use, the second elastic element 22 can also be set to other structures according to actual needs, as long as the above functions can be achieved. This is only for better illustrating the present utility model and should not constitute a limitation on the present utility model.

[0075] According to another aspect of the present invention, the present invention further provides a watch strap, including the length-adjustable end link structure described in any one of the above, and further including:

[0076] Multiple watch links are connected in sequence, with the second watch link 2 connected to the first watch link to form a chain-like watch strap. It can be used in wearable devices such as mechanical watches, electronic watches, smart watches, and smart bracelets.

[0077] Alternatively, a soft rubber strip, with the second end piece 2 connected to the end of the soft rubber strip to form a soft rubber watch strap, which can be applied to wearable devices such as mechanical watches, electronic watches, smart watches, and smart bracelets.

[0078] In the field of watch straps, the connection between the end links and the soft rubber strap is a common technique used in the field, which is to fix them by means of spring bars or the like. The installation through holes are shown in the figure. They can also be set according to common knowledge in the field, so they will not be described in detail here.

[0079] According to another aspect of the present invention, the present invention further provides a watch, including the watch strap described above, and also including a watch body, the watch body being connected to the first end link 1.

[0080] In this invention, the product is easy to assemble and can be adjusted after wearing. Simply pull the second end piece 2 and press the button 3 to retract it. The operation is convenient and the interactivity is better. The brand-new strap adjustment mechanism optimizes the adjustment operation feel and improves convenience.

[0081] In the watch industry, the use of interlocking links and spring bars to fix the watch body is a common technique. The installation through-hole is shown in the figure, but it can also be set according to common knowledge in the field, so it will not be described in detail here.

[0082] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0083] It should be noted that the above embodiments can be freely combined as needed. The above are merely preferred embodiments of this utility model. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A headstock structure with adjustable length, characterized in that, include: The first lead has a slot at one end, and the side wall of the slot is provided with a groove; The second headpiece is disposed in the slot and is movable along the length direction of the first headpiece. The second headpiece is provided with a spring ear. A button is spring-loaded and attached to the side of the first head piece; When the second headpiece is driven to move away from the first headpiece to the first position, the telescopic end of the spring ear extends and engages in the slot, so that the first headpiece and the second headpiece remain relatively fixed. Pressing the button causes the retractable end of the spring ear to separate from the slot, allowing the second tip to move to a second position closer to the first tip.

2. The length-adjustable headstock structure according to claim 1, characterized in that, The first tip has a button groove on its side, and the card slot is located at the bottom of the button groove; The button includes a pressing section, a first elastic element, and a driving section. The pressing section is adapted to be disposed in the button slot. The first elastic element is disposed between the pressing section and the bottom of the button slot. The driving section is connected to the pressing section. When the button is pressed, the drive section extends into the slot and drives the telescopic end of the spring ear to retract until it separates from the slot; When the button is released, it returns to its original position under the elastic force of the first elastic element.

3. The length-adjustable headstock structure according to claim 2, characterized in that, The bottom of the button slot is also provided with mounting holes, which are spaced apart from the card slot. The button also includes a mounting post, which is fixed to the side of the pressing section near the driving section. The end of the mounting post is provided with a hook, and the mounting post is adapted to be inserted into the mounting hole. The hook engages with the mounting hole. The first elastic element is elastic foam cotton. One side of the elastic foam cotton is bonded and fixed to the pressing section, and the other side is bonded and fixed to the bottom of the button groove.

4. The length-adjustable headstock structure according to claim 1, characterized in that, The first head piece is provided with a first limiting member, which is disposed in the slot. The second head piece is provided with a second limiting member. A second elastic member is disposed between the first limiting member and the second limiting member. The second elastic member is used to provide a driving force for the second head piece to move closer to the first head piece.

5. The length-adjustable headstock structure according to claim 4, characterized in that, The second elastic member includes at least one spring, the first limiting member includes a limiting hook, the limiting hook is detachable or fixed to the bottom of the slot, the second limiting member includes a limiting groove, one end of the spring abuts against the limiting hook, and the other end abuts against the bottom of the limiting groove.

6. The length-adjustable headstock structure according to claim 5, characterized in that, The second elastic element includes two springs, and two limiting slots are provided. The bottom of the slot is provided with a hook groove. The limiting hook includes a limiting hook body, a hook part and two limiting platforms provided on the limiting hook body. The hook part is fixed in the hook groove by adhesive. The two limiting platforms are arranged at intervals. One end of the spring abuts against the limiting platform and the other end abuts against the bottom of the corresponding limiting slot, so that the spring is compressed between the limiting platform and the bottom of the limiting slot.

7. The length-adjustable headstock structure according to claim 4, characterized in that, The second elastic member includes at least one spring, the first limiting member includes a first limiting stop fixed to the bottom of the slot, the second limiting member includes a second limiting stop detachably or fixed to the second head piece, one end of the spring abuts against the first limiting stop and the other end abuts against the second limiting stop.

8. The length-adjustable headstock structure according to claim 7, characterized in that, The second elastic element includes two springs, the first limiting stop is integrally formed with the first head piece, and the first limiting stop is provided with two first grooves; The top of the second headpiece is provided with a decorative groove, a decorative plate is provided in the decorative groove, a fixing post is provided in the decorative plate, a fixing hole is provided at a corresponding position in the decorative groove, and the fixing post is adapted to be inserted into the fixing hole, so that the decorative plate is fixedly or detachably connected to the second headpiece. The second limiting stop is integrally provided with the decorative plate, and two second stop grooves are provided on the second limiting stop. One end of the spring rests against the bottom of the first stop groove, and the other end rests against the bottom of the corresponding second stop groove, so that the spring is compressed between the bottom of the first stop groove and the bottom of the second stop groove.

9. The length-adjustable headstock structure according to claim 4, characterized in that, The second elastic element includes a torsion spring, and the first limiting element includes two spaced-apart stop posts, the two stop posts being fixed to the bottom of the slot; The bottom of the second head is provided with a clearance groove, and the second limiting member includes a torsion spring post. The torsion spring post is fixed to the bottom of the clearance groove, and the torsion spring is adapted to be installed on the torsion spring post. The two ends of the torsion spring abut against the two stop posts respectively.

10. The length-adjustable headstock structure according to claim 1, characterized in that, The slot has slots on both sides, and the second end piece has a spring ear groove. The spring ear is fitted into the spring ear groove, and the telescopic end of the spring ear faces the two sides of the second end piece. The first tip has button slots on both sides, and the two buttons are respectively located in the corresponding button slots.

11. A watch strap, characterized in that, Including the length-adjustable headpiece structure as described in any one of claims 1-10, further comprising: Multiple surface particles are connected in sequence, and the second head particle is connected to the first surface particle; Alternatively, a soft adhesive tape, wherein the second end piece is connected to the end of the soft adhesive tape.

12. A watch, characterized in that, The watch includes the strap as described in claim 11, and also includes a watch body connected to the first head link.

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