Novel knob type retractable watchband and watch

Abstract

The utility model relates to the field of daily life, in particular to a novel knob type retractable watchband and a watch, the novel knob type retractable watchband comprises a first band body connected with one side of a dial plate and a second band body connected with the other side of the dial plate; the first belt body and the second belt body are overlapped to form an overlapping area, the first belt body is provided with a first overlapping section overlapped with the second belt body, and the second belt body is provided with a second overlapping section overlapped with the first overlapping section; the folding and unfolding shell is used for accommodating the first overlapping section and the second overlapping section; the retractable shell comprises a first access port for the first overlapping section to enter and exit, a second access port for the second overlapping section to enter and exit and a mounting port for mounting the driving knob; the first belt body is provided with a first rack, and the second belt body is provided with a second rack. Tooth tips of the first rack and the second rack are oppositely arranged; the utility model also provides a watch. The utility model has the advantages of smooth expansion and contraction, flexibility and convenience, high-precision adjustment of any tightness, strong practicability and the like.

Description

Technical Field

[0001] The utility model relates to the field of daily life, in particular to a novel knob-type retractable watch strap and a watch. Background Art

[0002] Traditionally, watch straps on the market use pin buckles, but there are also hook buckles, snap buckles, folding buckles, folding safety buckles and butterfly buckles. Pin buckles are generally suitable for belts, and the rotating pin is inserted into different holes of the belt for adjustment and positioning. Hook buckles generally have a hook and a snap mouth to hook. Snap buckles generally use a card head and a card slot to press the buckle. Folding buckles usually have two or three folds, and the metal sheet is folded and shortened and a snap is set at the end. Folding safety buckles generally add a safety buckle sheet to the folding buckle to prevent the folding buckle from being accidentally opened. The principle of the butterfly buckle is similar to that of the folding buckle, but it is generally buckled together in the middle of the metal sheet. The above watch straps have their own characteristics and advantages and disadvantages, and are suitable for different watches or watch straps based on their structural limitations. However, these watch strap buckles on the market have complex structures, cumbersome operations, and are inconvenient to adjust the length and tightness of the strap at will, and their practicality needs to be improved.

[0003] In view of this, the inventor of this case conducted in-depth research on the above-mentioned issues, which led to the emergence of this case. Utility Model Content

[0004] One purpose of the utility model is to provide a novel knob-type retractable watch strap which is smoothly retractable, flexible and convenient and can adjust any tightness with high precision.

[0005] The second purpose of the utility model is to provide a watch which is flexible and convenient and can adjust any tightness with high precision.

[0006] In order to achieve the above object, the utility model adopts the following technical solution:

[0007] A novel knob-type retractable watch strap comprises a first strap body connected to one side of a watch dial and a second strap body connected to the other side of the watch dial; the first strap body and the second strap body overlap to have an overlapping area, the first strap body has a first overlapping section overlapping with the second strap body, and the second strap body has a second overlapping section overlapping with the first overlapping section; further comprising a retractable shell for accommodating the first overlapping section and the second overlapping section; the retractable shell comprises a first inlet and outlet for the first overlapping section to enter and exit, a second inlet and outlet for the second overlapping section to enter and exit, and an installation port for installing a driving knob; the first inlet and outlet, the second inlet and outlet and the installation port are connected; the first strap body is provided with a first rack, and the second strap body is provided with a second rack; the tooth tips of the first rack and the second rack are arranged facing each other.

[0008] The retractable shell has a first guide channel extending toward the first belt body, and a second guide channel extending toward the second belt body; the first inlet and outlet are formed in the first guide channel, and the second inlet and outlet are formed in the second guide channel; the first guide channel includes a first curved inner side wall facing one side and a first curved outer side wall facing the other side, the first curved inner side wall includes more than two first channel monomers arranged along the length direction of the first guide channel, and a first gap is provided between adjacent first channel monomers; the second guide channel includes a second curved inner side wall facing the same side as the first curved inner side wall and a second curved outer side wall facing the same side as the first curved outer side wall, the second curved inner side wall includes more than two second channel monomers arranged along the length direction of the second guide channel, and a second gap is provided between adjacent second channel monomers.

[0009] The first guide channel also includes a first connecting wall connected between the first curved inner side wall and the first curved outer side wall, the first connecting wall includes more than two first wall monomers corresponding to the first channel monomers one by one, there is a first wall gap between adjacent first wall monomers, and the first wall gap is connected to the first gap in a one-to-one correspondence; the second guide channel also includes a second connecting wall connected between the second curved inner side wall and the second curved outer side wall, the second connecting wall includes more than two second wall monomers corresponding to the second channel monomers one by one, there is a second wall gap between adjacent second wall monomers, and the second wall gap is connected to the second gap in a one-to-one correspondence; the first belt body is formed with a plurality of first wall monomers corresponding to the second channel monomers one by one, and a second wall gap is provided between adjacent second wall monomers, and the second wall gap is connected to the second gap in a one-to-one correspondence; The first strip hole extends, and the second belt body is formed with a second strip hole extending along the length direction of the second belt body; the first strip hole has a first toothed edge extending along the length direction of the first belt body and a first toothless edge on the other side, and the second strip hole has a second toothless edge corresponding to the first toothed edge and a second toothed edge corresponding to the first toothless edge; the first rack is formed on the first toothed edge and corresponds to the second toothless edge, and the second rack is formed on the second toothed edge and corresponds to the first toothless edge; the retractable shell has a accommodating cavity for accommodating the gear; the sum of the thickness of the first rack and the second rack is less than or equal to the length of the gear; the accommodating cavity is provided with a first abutting wall abutting the first toothed edge and a second abutting wall abutting the second toothed edge.

[0010] The mounting port is provided with a gear ring which cooperates with the claw teeth and is located at the outer ring of the anti-rotation elastic claw; the gear ring includes a plurality of ring teeth surrounding the gear axis and facing the gear axis; the ring teeth are formed on the inner side wall of the mounting port; the mounting port includes a top cavity for accommodating the anti-rotation elastic claw, and a bottom cavity for accommodating the gear; the gear ring is formed in the top cavity, and the first inlet and outlet and the second inlet and outlet are located in the bottom cavity and connected to the bottom cavity; the retractable shell has a partition wall between the top cavity and the bottom cavity.

[0011] The retractable shell has a first surrounding wall surrounding the installation opening; the first surrounding wall is a full-circle surrounding wall; and the ring teeth are formed on the inner circle side surface of the first surrounding wall.

[0012] The retractable shell has a second surrounding wall located in the outer circle of the first surrounding wall; a side wall gap for accommodating the button side wall is provided between the first surrounding wall and the second surrounding wall.

[0013] The second surrounding wall has an operating notch for an operator to operate the anti-slip part; the second surrounding wall includes a surrounding wall monomer 1 corresponding to the first inlet and outlet, and a surrounding wall monomer 2 corresponding to the second inlet and outlet; two operating notches are formed between the surrounding wall monomer 1 and the surrounding wall monomer 2.

[0014] The retractable shell has a bottom wall located at the opposite side of the installation opening; the bottom wall has a wall connecting portion connected to the button column.

[0015] The wall connection part includes a connection hole and a convex ring surrounding the connection hole; the convex ring is formed on the inner side of the retractable shell and extends into the wheel through hole of the gear, and the convex ring is formed with a ring hole for the button column to pass through; a wheel groove for accommodating the lower end of the gear is formed on the inner side of the bottom wall, and the wheel groove is arranged around the convex ring; the connection hole has a thin diameter portion extending into the button column and clamping the clamping edge of the column clamping head;

[0016] The outer side surface of the bottom wall is formed with a recessed groove for accommodating the column clamp; or, the bottom wall is formed with a protrusion surrounding the connecting hole.

[0017] A watch also includes a dial, which includes a first dial connecting part connected to the first belt body and a second dial connecting part connected to the second belt body.

[0018] After adopting the above technical scheme, the new knob-type retractable watch strap of the utility model breaks through the traditional watch strap structure and operation form, and can be connected to the dial as a watch strap. In actual use, the user drives the gear to rotate by turning the driving knob in the tightening rotation direction, and the gear drives the first rack and the second rack on the opposite side to move synchronously toward each other. Under the limiting effect of the retractable shell, the part of the first strap body outside the retractable shell is gradually retracted into the retractable shell from the first inlet and outlet, and the part of the second strap body outside the retractable shell is gradually retracted into the retractable shell from the second inlet and outlet, so that the overlapping part of the first strap body and the second strap body gradually becomes larger, and the watch strap as a whole becomes shorter, so that high-precision arbitrary tightening of the watch strap can be achieved. At the same time, the anti-rotation elastic claw of the anti-rotation component uses the claw teeth to clamp the corresponding parts such as the ring teeth of the retractable shell to the teeth. The wheel is positioned to maintain the corresponding tightness of the watchband; on the contrary, the user releases the blocking position of the anti-rotation component by turning the driving knob in the loosening rotation direction, and drives the gear to rotate in the opposite direction. The gear drives the first rack and the second rack on the opposite side to move synchronously in the direction away from each other. Under the limiting effect of the retractable shell, the part of the first strap body inside the retractable shell gradually extends out of the retractable shell from the first inlet and outlet, and the part of the second strap body inside the retractable shell gradually extends out of the retractable shell from the second inlet and outlet, so that the overlapping part of the first strap body and the second strap body gradually becomes smaller, and the overall length of the watchband becomes longer, so that the high-precision arbitrary loosening of the watchband is achieved. At the same time, the anti-rotation elastic claw of the anti-rotation component uses the claw teeth to clamp on the corresponding part such as the ring teeth of the retractable shell to position the gear, so as to maintain the corresponding tightness of the watchband. Compared with the prior art, the new knob-type retractable watchband of the utility model has the advantages of smooth extension and contraction, flexibility and convenience, high-precision adjustment of arbitrary tightness, and strong practicality.

[0019] The watch of the utility model breaks through the structural form of traditional watches. In the actual assembly process, the first band body of the watch strap can be connected to the first disc connecting part of the dial, and the second band body of the watch strap can be connected to the second disc connecting part of the dial to form the entire watch. In actual use, the user can wear the watch like wearing a bracelet. The user drives the gear to rotate by turning the driving knob in the tightening rotation direction, and the gear drives the first rack and the second rack on the opposite side to move synchronously toward each other. The part of the first band body outside the storage shell is gradually retracted into the storage shell from the first inlet and outlet, and the part of the second band body outside the storage shell is gradually retracted into the storage shell from the second inlet and outlet, so that the overlapping part of the first band body and the second band body gradually increases, and the watch strap becomes shorter as a whole, so that the watch strap can be tightened arbitrarily with high precision, and the anti-rotation elasticity of the anti-rotation component is improved. The claw uses claw teeth to clamp on the corresponding parts such as the ring teeth of the storage case to position the gear, thereby maintaining the corresponding tightness of the watchband; conversely, the user turns the driving knob in the direction of loosening rotation to release the clamping position of the anti-rotation component and drive the gear to rotate in the opposite direction, and the gear drives the first rack and the second rack on the opposite side to move synchronously in the direction away from each other, and the part of the first belt body inside the storage case gradually extends out of the storage case from the first inlet and outlet, and the part of the second belt body inside the storage case gradually extends out of the storage case from the second inlet and outlet, so that the overlapping part of the first belt body and the second belt body gradually becomes smaller, and the overall length of the watchband becomes longer, so that the high-precision arbitrary loosening of the watchband is achieved, and at the same time, the anti-rotation elastic claw of the anti-rotation component clamps on the corresponding parts such as the ring teeth of the storage case to position the gear, thereby maintaining the corresponding tightness of the watchband. Compared with the prior art, the watch of the utility model has the advantages of smooth extension and retraction, flexibility and convenience, high-precision adjustment of arbitrary tightness, and strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the three-dimensional structure of the strap;

[0021] Figure 2 It is a schematic diagram of the partial structure of the strap from a side view;

[0022] Figure 3 is a schematic diagram of a partial cross-sectional structure of a watch strap from a side view;

[0023] Figure 4 is a schematic diagram of the cross-sectional structure of the watch strap from another angle;

[0024] Figure 5 It is a schematic diagram of the three-dimensional structure of the retractable shell;

[0025] Figure 6 It is a schematic diagram of the top view of the retractable shell structure;

[0026] Figure 7 It is a schematic diagram of the three-dimensional structure of the gear and the anti-rotation elastic claw;

[0027] Figure 8This is a schematic diagram of the structure of the button body from the inner side perspective;

[0028] Fig. 9 A schematic diagram of the use status of a watch strap or a side view of a watch;

[0029] Fig.10 It is a schematic diagram of the usage status of the strap or the three-dimensional structure of the watch.

[0030] In the figure:

[0031] 1-first belt body, 11-first rack; 2-second belt body, 21-second rack;

[0032] 3-retractable shell, 31-first inlet and outlet, 32-second inlet and outlet, 331-toothed ring, 34-first guide channel, 341-first curved inner wall, 3411-first channel monomer, 3412-first gap, 342-first curved outer wall, 343-first connecting wall, 3431-first wall monomer, 3432-first wall gap, 35-second guide channel, 351-second curved inner wall, 3511-second channel Monomer, 3512-second gap, 352-second curved outer side wall, 353-second connecting wall, 3531-second wall monomer, 3532-second wall gap, 361-first top wall, 362-second top wall, 37-partition wall, 38-first surrounding wall, 39-second surrounding wall, 3a-side wall gap, 3b-bottom wall, 3b1-connecting hole, 3b11-card edge, 3b2-convex ring, 3b3-wheel groove, 3b4-sinking groove;

[0033] 4- dial;

[0034] 52-driving knob, 521-gear, 5211-anti-rotation elastic claw, 52111-elastic claw arm, 52112-claw teeth, 5212-claw ring, 5213-claw connecting part, 5214-wheel through hole, 522-button body, 523-button protrusion, 524-button column, 5244-column clamp, 531-switch main driving part, 5311-driving inclined plane, 532-switch driven part. DETAILED DESCRIPTION

[0035] In order to further explain the technical solution of the present utility model, it is described in detail through specific embodiments below.

[0036] The utility model discloses a novel knob-type retractable watch strap, such as Figure 1-10As shown, it includes a first belt body 1 connected to one side of the dial 4 and a second belt body 2 connected to the other side of the dial 4; the first belt body 1 and the second belt body 2 are superimposed and have an overlapping area, the first belt body 1 has a first overlapping section overlapping the second belt body 2, and the second belt body 2 has a second overlapping section overlapping the first overlapping section; it also includes a retractable shell 3 for accommodating the first overlapping section and the second overlapping section; the retractable shell 3 includes a first inlet and outlet 31 for the first overlapping section to enter and exit, a second inlet and outlet 32 ​​for the second overlapping section to enter and exit, and an installation port for installing a driving knob 52; the first inlet and outlet 31, the second inlet and outlet 32 ​​and the installation port are connected; the first belt body 1 is provided with a first rack 11, and the second belt body 2 is provided with a second rack 21; the tooth tips of the first rack 11 and the second rack 21 are arranged facing each other. The utility model can be connected to the dial 4 through the first strap connection part and the second strap connection part as a strap. In actual use, the user drives the gear 521 to rotate by turning the driving knob 52 in the tightening rotation direction, and the gear 521 drives the first rack 11 and the second rack 21 on the opposite sides to move synchronously toward each other. Under the restriction of the storage shell 3, the part of the first strap body 1 outside the storage shell 3 is gradually retracted into the storage shell 3 from the first inlet and outlet 31, and the part of the second strap body 2 outside the storage shell 3 is gradually retracted into the storage shell 3 from the second inlet and outlet 32, so that the overlapping part of the first strap body 1 and the second strap body 2 gradually becomes larger, and the strap as a whole becomes shorter, so that the strap can be tightened arbitrarily with high precision. At the same time, the anti-rotation elastic claw 5211 of the anti-rotation component uses the claw teeth 52112 to clamp the gear 521 on the corresponding part, such as the ring teeth of the storage shell 3, so as to achieve the positioning of the gear 521. The corresponding tightness of the watch strap is maintained; on the contrary, the user releases the locking position of the anti-rotation component by turning the driving knob 52 in the loosening rotation direction, thereby driving the gear 521 to rotate in the opposite direction, and the gear 521 drives the first rack 11 and the second rack 21 on the opposite side to move synchronously in the away direction. Under the limiting action of the storage shell 3, the part of the first strap 1 inside the storage shell 3 gradually extends out of the storage shell 3 from the first inlet and outlet 31, and the part of the second strap 2 inside the storage shell 3 gradually extends out of the storage shell 3 from the second inlet and outlet 32, so that the overlapping part of the first strap 1 and the second strap 2 gradually becomes smaller, and the strap as a whole becomes longer, thereby achieving high-precision arbitrary loosening of the strap. At the same time, the anti-rotation elastic claw 5211 of the anti-rotation component uses the claw teeth 52112 to clamp the gear 521 on the corresponding part such as the ring teeth of the storage shell 3, thereby maintaining the corresponding tightness of the watch strap.

[0037] When the claw teeth 52112 and the ring teeth are provided with matching inclined surfaces and card surfaces, the relative rotation in the corresponding clockwise direction can be realized, and the relative cardinal direction will be relatively locked. The specific structure can be that the first belt body 1 is formed with a first strip hole extending along the length direction of the first belt body 1, and the second belt body 2 is formed with a second strip hole extending along the length direction of the second belt body 2; the first strip hole has a first toothed edge extending along the length direction of the first belt body 1 and a first toothless edge on the other side, and the second strip hole has a second toothless edge corresponding to the first toothed edge and a second toothed edge corresponding to the first toothless edge; the first rack 11 is formed on the first toothed edge and corresponds to the second toothless edge, and the second rack 21 is formed on the second toothed edge and corresponds to the first toothless edge; the retractable shell 3 has an accommodating cavity for accommodating the gear 521; the sum of the thickness of the first rack 11 and the second rack 21 is less than or equal to the length of the gear 521; the accommodating cavity is provided with a first abutting wall 361 abutting the first toothed edge and a second abutting wall 362 abutting the second toothed edge.

[0038] The first strip hole and the second strip hole are closed. The axis of the gear 521 is perpendicular to the plane where the first belt body 1 and the second belt body 2 are located. The first rack 11 is formed in the first strip hole, and the second rack 21 is formed in the second strip hole, which can ensure the strength and integrity of the first belt body 1 and the second belt body 2; at the same time, the axis of the gear 521 is perpendicular to the plane where the first belt body 1 and the second belt body 2 are located, and the first toothless edge and the second toothless edge can be limited on both sides of the gear 521 and ensure the meshing and stable operation of the gear 521 with the first rack 11 and the second rack 21; at the same time, the first top wall 361 and the second top wall 362 can respectively limit the first tooth edge and the second tooth edge, further ensuring the meshing and stable operation of the gear 521 with the first rack 11 and the second rack 21.

[0039] In order to further ensure the above effect, the teeth of the first rack 11 are closer to the gear 521 than the second toothless edge, and the teeth of the second rack 21 are closer to the gear 521 than the first toothless edge. The width of the first overlapping section and the second overlapping section are the same, so that the first overlapping section and the second overlapping section can be limited by the first inlet and outlet 31 and the second inlet and outlet 32 ​​to guide the operation of the first belt body 1 and the second belt body 2.

[0040] The driving knob 52 includes a driving component for driving the anti-rotation elastic claw 5211; the driving component includes a button protrusion 523 arranged on the inner surface of the button body 522; the anti-rotation component also includes a claw ring 5212 that carries the anti-rotation elastic claw 5211 and is located in the inner circle of the anti-rotation elastic claw 5211, and the anti-rotation elastic claw 5211 is connected to the claw ring 5212 through a claw connecting portion 5213; the button protrusion 523 extends between adjacent claw connecting portions 5213; and there is a moving space between adjacent claw connecting portions 5213 for the button protrusion 523 to move in a tightening rotation direction or a loosening rotation direction. The driving knob 52 uses a driving component in the form of a button protrusion 523 to extend between adjacent claw connecting parts 5213. When the user rotates the button body 522 in the tightening rotation direction, the button body 522 drives the button protrusion 523 to drive the anti-rotation component to rotate in the tightening rotation direction, so that the gear 521 drives the first rack 11 and the second rack 21 on the opposite side to move toward each other, so that the overlapping part of the first belt body 1 and the second belt body 2 gradually becomes larger, and the strap as a whole becomes shorter, thereby achieving high-precision arbitrary tightening of the strap. At the same time, the anti-rotation elastic claw 5211 of the anti-rotation component uses the claw teeth 52112 to clamp on the corresponding parts such as the ring teeth of the retractable shell 3 to position the gear 521, thereby maintaining the corresponding tightness of the strap; conversely, when the user rotates the button body 522 in the loosening rotation direction, the button body The body 522 uses the moving space between the adjacent claw connecting parts 5213 to realize a short-term independent rotation. During this independent rotation, the button body 522 does not drive the anti-rotation elastic claw 5211, but unlocks the snapping state of the claw teeth 52112 and the ring teeth. Then the button body 522 drives the button protrusion 523 to drive the anti-rotation component to rotate in the loosening rotation direction, so that the gear 521 drives the first rack 11 and the second rack 21 on the opposite side to move away from each other, so that the overlapping part of the first belt body 1 and the second belt body 2 gradually becomes smaller, and the overall length of the watchband becomes longer, so as to realize high-precision arbitrary loosening of the watchband. At the same time, the anti-rotation elastic claw 5211 of the anti-rotation component uses the claw teeth 52112 to clamp on the corresponding part such as the ring teeth of the retractable shell 3 to position the gear 521, thereby realizing the corresponding tightness of the watchband. The claw ring 5212 can position the anti-rotation elastic claw 5211 and ensure the strength of the anti-rotation component. The specific structure may be that the claw connection part 5213 extends from the inner ring to the outer ring and is connected between the fixed end of the anti-rotation elastic claw 5211 and the claw ring 5212. This structure can ensure the strength of the anti-rotation component and enable the anti-rotation component and the button protrusion 523 to have a reasonable matching structure and space.

[0041] It also includes a driving switch for driving the claw teeth 52112 to disengage from the ring teeth; the driving switch includes a switch main driving portion 531 arranged on the button body 522, and a switch driven portion 532 arranged on the anti-rotation elastic claw 5211; the free end of the elastic claw arm 52111 has a claw top surface facing the button body 522, and a claw bottom surface facing the opposite direction; the switch main driving portion 531 is a main driving recess formed on the inner surface of the button body 522, and the switch driven portion 532 is a driven protrusion formed on the claw top surface and extending into the main driving recess. When the user operates the button body 522 to rotate in the loosening rotation direction, the main driving recess and the driven convex portion cooperate to extend into each other to form mutual interference in the rotation direction. When the button body 522 rotates, the main driving recess exerts a force on the driven convex portion to drive the claw tooth 52112 to move away from the ring tooth, thereby unlocking the gear 521. The first belt body 1 and the second belt body 2 move synchronously in the direction of separation, and the strap becomes longer as a whole, thereby achieving high-precision and arbitrary loosening of the strap. When the user stops rotating the button body 522, the anti-rotation elastic claw 5211 of the anti-rotation component swings toward the outer circle by relying on its own elasticity, and uses the claw tooth 52112 to clamp on the corresponding position such as the ring tooth of the retractable shell 3 to position the gear 521, thereby maintaining the corresponding tightness of the strap. The specific structure may be that the driven protrusion is a protruding column formed on the top surface of the claw, and the main driving recess is a groove formed on the inner surface of the button body 522; the main driving recess has a driving inclined surface 5311 which is located in the outer ring of the driven protrusion and drives the driven protrusion toward the inner ring, and the driving inclined surface 5311 is gradually inclined toward the inner ring from the loosening rotation direction to the tightening rotation direction; the main driving recess has an inner ring groove wall which is located in the inner ring of the driven protrusion, the main driving recess has a tightening recess end facing the tightening rotation direction and a relaxing recess end facing the loosening rotation direction, and the inner ring groove wall has a swinging space between the relaxing recess end and the driven protrusion for the driven recess to move toward the inner ring. When the user operates the button body 522 to rotate in the direction of loosening, the driving inclined surface 5311 of the main driving recess applies pressure toward the inner ring to the driven protrusion, so that the claw teeth 52112 swing toward the inner ring by relying on the elasticity of the anti-rotation elastic claw 5211 and then disengage from the engagement with the ring teeth, thereby unlocking the gear 521. The first belt body 1 and the second belt body 2 move synchronously in the direction of moving away, and the strap becomes longer as a whole, thereby achieving high-precision arbitrary loosening of the strap. When the user stops rotating the button body 522, the anti-rotation elastic claw 5211 of the anti-rotation component swings toward the outer ring by relying on its own elasticity, and the claw teeth 52112 are stuck on the corresponding parts such as the ring teeth of the storage shell 3 to position the gear 521. The swinging space between the inner ring groove wall at the end of the loosening recess and the driven protrusion serves as the swinging space for the anti-rotation elastic claw 5211 to drive the claw teeth 52112 to swing. In order to ensure that the aforementioned structure is stable and reliable, a more specific structure may be that the free end of the elastic claw arm 52111 has a claw head forming a driven protrusion, and the claw head protrudes toward the inner circle; the claw teeth 52112 are formed on the outer circle side of the claw head; and the driven protrusion is formed on the claw top surface of the claw head.In order to ensure smooth cooperation between the driven convex part and the main driving concave part, the driven convex part is cylindrical, the main driving concave part is roughly wedge-shaped, and each angle of the main driving concave part is chamfered.

[0042] The specific structure may be that three or four anti-rotation elastic claws 5211 are evenly arranged around the axis of the gear 521. In order to further ensure the consistent rotation strength of the anti-rotation elastic claw 5211 and the gear 521, the anti-rotation elastic claw 5211 and the gear 521 are integrally injection molded. The specific structure may be that the tip of the claw tooth 52112 faces the loosening rotation direction, which can ensure that the clamping force of each claw tooth 52112 is in the same clockwise direction, ensuring the clamping strength. In order to ensure the one-way locking function of the claw tooth 52112 and the claw tooth 52112 rotates along with the button body 522 in the tightening rotation direction, the claw tooth 52112 includes a claw inclined surface facing the tightening rotation direction and a claw clamping surface facing the loosening rotation direction; the claw inclined surface gradually tilts toward the loosening rotation direction from the root of the claw tooth 52112 to the tip, and the angle between the claw inclined surface and the plane where the claw clamping surface is located is less than 90° (preferably 75°, 60° or 45°). Furthermore, the claw surface gradually tilts toward the loosening rotation direction from the root of the claw tooth 52112 to the tip of the claw tooth 52112, and this structure can ensure the locking strength of the claw surface and the ring tooth, and is not easy to disengage. In order to further ensure the locking strength of the anti-rotation elastic claw 5211, the elastic claw arm 52111 is provided with two claw teeth 52112.

[0043] Preferably, the retractable shell 3 has a first guide channel 34 extending toward the first belt body 1, and a second guide channel 35 extending toward the second belt body 2; the first inlet and outlet 31 is formed in the first guide channel 34, and the second inlet and outlet 32 ​​is formed in the second guide channel 35; the first guide channel 34 includes a first curved inner side wall 341 facing one side and a first curved outer side wall 342 facing the other side, the first curved inner side wall 341 includes more than two first channel monomers 3411 arranged along the length direction of the first guide channel 34, and a first gap 3412 is provided between adjacent first channel monomers 3411; the second guide channel 35 includes a second curved inner side wall 351 facing the same side as the first curved inner side wall 341 and a second curved outer side wall 352 facing the same side as the first curved outer side wall 342, the second curved inner side wall 351 includes more than two second channel monomers 3511 arranged along the length direction of the second guide channel 35, and a second gap 3512 is provided between adjacent second channel monomers 3511. This structure can ensure that the first guide channel 34 has the function of cooperating with the first belt body 1 to bend inward, and the second guide channel 35 has the function of cooperating with the second belt body 2 to bend inward. When the first guide channel 34 bends inward, the sheet-like first curved outer side wall 342 bends directly, and the first curved inner side wall 341 is compressed by the first gap 3412 between the adjacent first channel monomers 3411, so that the entire first guide channel 34 has an inward curved shape, and the inner side surface of the smooth first curved outer side wall 342 smoothly contacts the first belt body 1 or the second belt body 2 without causing jamming; when the second guide channel 35 bends inward, the sheet-like second curved outer side wall 352 bends directly, and the second curved inner side wall 351 is compressed by the second gap 3512 between the adjacent second channel monomers 3511, so that the entire second guide channel 35 has an inward curved shape, and the inner side surface of the smooth second curved outer side wall 352 smoothly contacts the first belt body 1 or the second belt body 2 without causing jamming. As the retracting and extending adjusting device adjusts the first strap body 1 and the second strap body 2, the first guide channel 34 and the second guide channel 35 limit and guide the first strap body 1 and the second strap body 2, and form a corresponding curvature to adapt to the curvature of the arm, etc. Moreover, the first curved outer side wall 342 and the second curved outer side wall 352 of the whole piece make the outer side of the strap complete and beautiful.Preferably, the first guide channel 34 further includes a first connecting wall 343 connected between the first curved inner side wall 341 and the first curved outer side wall 342, the first connecting wall 343 includes two or more first wall monomers 3431 corresponding to the first channel monomers 3411, and there is a first wall gap 3432 between adjacent first wall monomers 3431, and the first wall gap 3432 is connected to the first channel gap 3412 in a one-to-one correspondence; the second guide channel 35 further includes a second connecting wall 353 connected between the second curved inner side wall 351 and the second curved outer side wall 352, the second connecting wall 353 includes two or more second wall monomers 3531 corresponding to the second channel monomers 3511, and there is a second wall gap 3532 between adjacent second wall monomers 3531, and the second wall gap 3532 is connected to the second channel gap 3 512 are connected in a one-to-one correspondence; the first belt body 1 is formed with a first strip hole extending along the length direction of the first belt body 1, and the second belt body 2 is formed with a second strip hole extending along the length direction of the second belt body 2; the first strip hole has a first toothed edge extending along the length direction of the first belt body 1 and a first toothless edge on the other side, and the second strip hole has a second toothless edge corresponding to the first toothed edge and a second toothed edge corresponding to the first toothless edge; the first rack 11 is formed on the first toothed edge and corresponds to the second toothless edge, and the second rack 21 is formed on the second toothed edge and corresponds to the first toothless edge; the retractable shell 3 has a receiving cavity for accommodating the gear 521; the sum of the thickness of the first rack 11 and the second rack 21 is less than or equal to the length of the gear 521; the receiving cavity is provided with a first abutting wall 361 abutting the first toothed edge and a second abutting wall 362 abutting the second toothed edge. The first connecting wall 343 and the second connecting wall 353 are used to form the first guide channel 34 and the second guide channel 35 to accommodate the thickness space of the first belt body 1 and the second belt body 2. There are more than three first wall monomers 3431 and first channel monomers 3411, and there are more than three second wall monomers 3531 and second channel monomers 3511; the first wall gap 3432 can ensure that the first guide channel 34 has the function of cooperating with the first belt body 1 to bend inward on the basis of having a certain thickness space, and the second guide channel 35 has the function of cooperating with the second belt body 2 to bend inward on the basis of having a certain thickness space.When the first guide channel 34 bends inwardly, the sheet-like first curved outer side wall 342 bends directly, while the first curved inner side wall 341 and the first connecting wall 343 are compressed by the first gap 3412 between adjacent first channel monomers 3411 and the first wall gap 3432 between adjacent first wall monomers 3431, so that the entire first guide channel 34 has an inwardly curved shape, and the inner side surface of the smooth first curved outer side wall 342 contacts smoothly with the first belt body 1 or the second belt body 2 without causing any jamming; when the second guide channel 35 bends inwardly, the sheet-like second curved outer side wall 352 bends directly, while the second curved inner side wall 351 and the second connecting wall 353 are compressed by the second gap 3512 between adjacent second channel monomers 3511 and the second wall gap 3532 between adjacent second wall monomers 3531, so that the entire second guide channel 35 has an inwardly curved shape, and the inner side surface of the smooth second curved outer side wall 352 contacts smoothly with the first belt body 1 or the second belt body 2 without causing any jamming. The first rack 11 is formed in the first strip hole, and the second rack 21 is formed in the second strip hole, which can ensure the strength and integrity of the first belt body 1 and the second belt body 2; at the same time; the first toothless edge and the second toothless edge can be limited on both sides of the gear 521 and ensure the meshing and stable operation of the gear 521 with the first rack 11 and the second rack 21; at the same time, the sum of the thickness of the first rack 11 and the second rack 21 is less than or equal to the length of the gear 521, which can ensure the meshing stability of the gear 521 with the first rack 11 and the second rack 21, and it is not easy to disengage. At the same time, the first top wall 361 and the second top wall 362 can respectively limit the first tooth edge and the second tooth edge, further ensuring the meshing and stable operation of the gear 521 with the first rack 11 and the second rack 21. The specific structure can be that, in order to ensure the inward bending performance of the first belt body 1 and the second belt body 2, the width of the first wall gap 3432 and the first gap 3412 is 1 mm (specifically 1.5, 2 or 2.5 mm) or more, and the width of the second wall gap 3532 and the second gap 3512 is 1 mm (specifically 1.5, 2 or 2.5 mm) or more to ensure the bending angle and amplitude.

[0044] Preferably, the mounting port is provided with a toothed ring 331 which cooperates with the claw teeth 52112 and is located on the outer ring of the anti-rotation elastic claw 5211; the toothed ring 331 includes a plurality of ring teeth surrounding the axis of the gear 521 and facing the axis of the gear 521; the ring teeth are formed on the inner side wall of the mounting port; the mounting port includes a top cavity for accommodating the anti-rotation elastic claw 5211, and a bottom cavity for accommodating the gear 521; the toothed ring 331 is formed in the top cavity, and the first inlet and outlet 31 and the second inlet and outlet 32 ​​are located in the bottom cavity and connected to the bottom cavity; the retractable shell 3 has a partition wall 37 between the top cavity and the bottom cavity. When the user rotates the button body 522 in the tightening direction, the button body 522 drives the button protrusion 523 to drive the anti-rotation component to rotate in the tightening direction, so that the gear 521 drives the first rack 11 and the second rack 21 on the opposite sides to move toward each other, so that the overlapping part of the first belt body 1 and the second belt body 2 gradually becomes larger, and the strap as a whole becomes shorter, so as to achieve high-precision arbitrary tightening of the strap. At the same time, the anti-rotation elastic claw 5211 of the anti-rotation component uses the claw teeth 52112 to clamp on the ring teeth of the gear ring 331 to position the gear 521, thereby maintaining the corresponding tightness of the strap; when the user operates the button body 522 to rotate in the loosening direction, the driving inclined surface 53 of the main drive recess is used to 11 applies pressure toward the inner ring on the driven convex portion, so that the claw tooth 52112 swings toward the inner ring by relying on the elasticity of the anti-rotation elastic claw 5211 and then disengages from the meshing with the ring teeth, thereby unlocking the gear 521. The first strap body 1 and the second strap body 2 move synchronously in the direction of moving away, and the strap as a whole becomes longer, thereby achieving high-precision arbitrary loosening of the strap. When the user stops turning the button body 522, the anti-rotation elastic claw 5211 of the anti-rotation component swings toward the outer ring by relying on its own elasticity, and the claw tooth 52112 is clamped on the ring teeth of the gear ring 331 to position the gear 521. The swinging space between the inner ring groove wall at the end of the relaxing recess and the driven convex portion serves as the swinging space for the anti-rotation elastic claw 5211 to drive the claw tooth 52112 to swing. In order to ensure the one-way locking function of the claw teeth 52112 and the ring teeth and the rotation of the claw teeth 52112 along with the button body 522 in the tightening rotation direction, the ring teeth include a ring clamping surface facing the tightening rotation direction and a ring bevel facing the loosening rotation direction; the ring bevel gradually tilts toward the tightening rotation direction from the root of the tooth to the tip, and the angle between the ring bevel and the plane where the ring clamping surface is located is less than 90° (preferably 75°, 60° or 45°). Furthermore, the ring clamping surface gradually tilts toward the loosening rotation direction from the root of the ring teeth to the tip of the ring teeth. This structure can ensure the locking strength of the claw clamping surface and the ring teeth and is not easy to disengage. In order to ensure that the button column 524 and the gear 521 are stably matched perpendicularly to the first belt body 1 and the second belt body 2, the opening of the installation port is perpendicular to the plane where the first belt body 1 and the second belt body 2 are located.The bottom cavity can limit the first belt body 1 and the second belt body 2 to ensure the smooth and stable operation of the first belt body 1 and the second belt body 2; the top cavity can accommodate or limit the anti-rotation elastic claw 5211 to ensure the smooth and stable operation of the anti-rotation elastic claw 5211; at the same time, the partition wall 37 can be used as a reinforcing rib of the retractable shell 3 to prevent the retractable shell 3 from being easily deformed and affecting the performance. In order to facilitate the installation and limiting of the gear 521, the middle part of the partition wall 37 has a wall through hole. In order to facilitate the rotation of the gear 521, the partition wall 37 is annular. In order to facilitate the smooth and stable rotation of the button body 522, the retractable shell 3 has a supporting surface for supporting the side wall of the button. The partition wall 37 corresponds to the bottom surface of the claw of the elastic claw arm 52111; the elastic claw arm 52111 is between the partition wall 37 and the button body 522.

[0045] Preferably, the retractable shell 3 has a first surrounding wall 38 surrounding the installation opening; the first surrounding wall 38 is a full-circle surrounding wall; the ring teeth are formed on the inner circle side of the first surrounding wall 38. In actual working process, the button body 522 has a button side wall facing the retractable shell 3, the button side wall is located in the outer circle of the toothed ring 331, and the outer side of the button side wall is formed with anti-slip stripes, the first surrounding wall 38 extends into the inner circle of the button side wall, and the first surrounding wall 38 and the button side wall are nested inside and outside to limit and guide each other, ensuring the stability of the rotation of the button body 522. And it is convenient for the ring teeth to directly correspond to the anti-rotation elastic claw 5211. Preferably, the retractable shell 3 has a second surrounding wall 39 located in the outer circle of the first surrounding wall 38; there is a side wall gap 3a between the first surrounding wall 38 and the second surrounding wall 39 to accommodate the button side wall. The second surrounding wall 39 can protect the button side wall at the outer circle of the button side wall to prevent the button side wall from being hit or accidentally touched. Moreover, the second surrounding wall 39 can cooperate with the first surrounding wall 38 to limit and guide the button side wall at the inner and outer circles of the button side wall, so as to ensure the smoothness and stability of the rotation of the button body 522. Preferably, the button body 522 has a button side wall extending toward the retractable shell 3, and the outer side surface of the button side wall is formed with an anti-skid portion for the operator to operate, and the second surrounding wall 39 has an operation notch for the operator to operate the anti-skid portion; the second surrounding wall 39 includes a surrounding wall monomer 1 corresponding to the first inlet and outlet 31, and a surrounding wall monomer 2 corresponding to the second inlet and outlet 32; two operation notches are formed between the surrounding wall monomer 1 and the surrounding wall monomer 2. The surrounding wall monomer 1 and the surrounding wall monomer 2, on the basis of protecting and limiting the button side wall, use the operation notch for the operator to operate the button body 522, which is convenient and practical. The specific structure can be that the anti-skid portion is an anti-skid stripe, and the anti-skid stripe protrudes to the outer circle from the edge of the operation notch. It is anti-skid and convenient for users to operate. In order to prevent the surrounding wall monomers 1 and 2 from colliding with external objects and to be more friendly, the specific structure may be that the outer side surfaces of the surrounding wall monomers 1 and 2 are inclined surfaces that gradually incline toward the inner circle from the root to the end.

[0046] Preferably, the retractable shell 3 has a bottom wall 3b on the opposite side of the installation opening; the bottom wall 3b has a wall connection portion connected to the button column 524. During installation, the button column 524 of the button body 522 passes through the gear 521 and is connected to the wall connection portion, so that the gear 521 and other components are wrapped in the retractable shell 3. Preferably, the wall connection portion includes a connection hole 3b1 and a convex ring 3b2 surrounding the connection hole 3b1; the convex ring 3b2 is formed on the inner side of the retractable shell 3 and extends into the wheel through hole 5214 of the gear 521, and the convex ring 3b2 is formed with a ring hole for the button column 524 to pass through; the connection hole 3b1 has a thin diameter portion that extends into the button column 524 and clamps the clamping edge 3b11 of the column clamp 5244; after the column clamp 5244 of the button column 524 passes through the connection hole 3b1, it is clamped on the clamping edge 3b11 of the connection hole 3b1 through the thin diameter portion near the end for limiting, and the convex ring 3b2 and the gear 521 form an inner and outer nested limiting and guiding structure, so that the gear 521 can rotate smoothly and stably, and the gear 521 can be prevented from being displaced or deformed by the force of the first belt body 1 and the second belt body 2. The specific structure may be that a wheel groove 3b3 for accommodating the lower end of the gear 521 is formed on the inner side of the bottom wall 3b of the retractable shell 3, and the wheel groove 3b3 is arranged around the convex ring 3b2. Preferably, a recessed groove 3b4 for accommodating the column clamp 5244 is formed on the outer side of the bottom wall 3b. The recessed groove 3b4 can accommodate the column clamp 5244 to prevent the column clamp 5244 from protruding too much and causing unfriendly situations such as damaging the arm. Alternatively, preferably, a protrusion surrounding the connecting hole 3b1 is formed on the bottom wall 3b. The protrusion can also surround or accommodate the column clamp 5244 to prevent the column clamp 5244 from protruding too much and causing unfriendly situations such as damaging the arm.

[0047] A watch also includes a dial 4, which includes a first disc connection portion connected to a first band body 1 and a second disc connection portion connected to a second band body 2. In the actual assembly process, the first band body 1 of the watchband can be connected to the first disc connection portion of the dial 4, and the second band body 2 of the watchband can be connected to the second disc connection portion of the dial 4 to form the entire watch. In actual use, the user can wear the watch like a bracelet. The user rotates the drive knob 52 in the tightening rotation direction to drive the gear 521 to rotate, and the gear 521 drives the first rack 11 and the second rack 21 on the opposite side to move synchronously toward each other. The portion of the first band body 1 outside the storage shell 3 gradually retracts from the first inlet and outlet 31 into the storage shell 3, and the portion of the second band body 2 outside the storage shell 3 gradually retracts from the second inlet and outlet 32 ​​into the storage shell 3, so that the overlapping portion of the first band body 1 and the second band body 2 gradually increases, and the overall strap becomes shorter, so that the strap can be tightened arbitrarily with high precision. At the same time, the anti-rotation elastic claw 5211 of the anti-rotation component is stuck in the corresponding position such as the storage shell by the claw teeth 52112. The gear 521 is positioned on the ring teeth of the housing 3, thereby maintaining the corresponding tightness of the watchband; conversely, the user rotates the driving knob 52 in the direction of loosening rotation to release the blocking position of the anti-rotation component and drive the gear 521 to rotate in the opposite direction, and the gear 521 drives the first rack 11 and the second rack 21 on the opposite side to move synchronously in the direction away from each other, and the part of the first strap 1 inside the housing 3 gradually extends out of the housing 3 from the first inlet and outlet 31, and the part of the second strap 2 inside the housing 3 gradually extends out of the housing 3 from the second inlet and outlet 32, so that the overlapping part of the first strap 1 and the second strap 2 gradually becomes smaller, and the overall length of the strap becomes longer, so that the high-precision arbitrary loosening of the strap is achieved, and at the same time, the anti-rotation elastic claw 5211 of the anti-rotation component uses the claw teeth 52112 to be stuck on the corresponding part such as the ring teeth of the housing 3 to position the gear 521, thereby maintaining the corresponding tightness of the strap. The first strap 1, the second strap 2 and the housing 3 can be made of nylon material. The dial 4 can be a smart watch, a mechanical watch, an electronic watch, etc.

[0048] The product form of the utility model is not limited to the illustrations and embodiments of this case. Any appropriate changes or modifications made by anyone with similar ideas should be deemed to be within the patent scope of the utility model.

Claims

1. A novel knob-type retractable watch strap, comprising a first strap body connected to one side of a watch dial and a second strap body connected to the other side of the watch dial; characterized in that: The first belt body and the second belt body overlap and have an overlapping area, the first belt body has a first overlapping section overlapping with the second belt body, and the second belt body has a second overlapping section overlapping with the first overlapping section; it also includes a retractable shell for accommodating the first overlapping section and the second overlapping section; the retractable shell includes a first inlet and outlet for the first overlapping section to enter and exit, a second inlet and outlet for the second overlapping section to enter and exit, and an installation port for installing a driving knob; the first inlet and outlet, the second inlet and outlet and the installation port are connected; the first belt body is provided with a first rack, and the second belt body is provided with a second rack; the tooth tips of the first rack and the second rack are arranged facing each other.

2. The novel knob-type retractable watch strap according to claim 1 is characterized in that: The retractable shell has a first guide channel extending toward the first belt body, and a second guide channel extending toward the second belt body; the first inlet and outlet are formed in the first guide channel, and the second inlet and outlet are formed in the second guide channel; The first guide channel includes a first curved inner side wall facing one side and a first curved outer side wall facing the other side, the first curved inner side wall includes more than two first channel monomers arranged along the length direction of the first guide channel, and a first gap is provided between adjacent first channel monomers; the second guide channel includes a second curved inner side wall facing the same side as the first curved inner side wall and a second curved outer side wall facing the same side as the first curved outer side wall, the second curved inner side wall includes more than two second channel monomers arranged along the length direction of the second guide channel, and a second gap is provided between adjacent second channel monomers.

3. The novel knob-type retractable watch strap according to claim 2 is characterized in that: The first guide channel also includes a first connecting wall connected between the first curved inner side wall and the first curved outer side wall, the first connecting wall includes more than two first wall monomers corresponding to the first channel monomers one by one, there is a first wall gap between adjacent first wall monomers, and the first wall gap is connected to the first gap in a one-to-one correspondence; the second guide channel also includes a second connecting wall connected between the second curved inner side wall and the second curved outer side wall, the second connecting wall includes more than two second wall monomers corresponding to the second channel monomers one by one, there is a second wall gap between adjacent second wall monomers, and the second wall gap is connected to the second gap in a one-to-one correspondence; the first belt body is formed with a plurality of first wall monomers corresponding to the second channel monomers one by one, and a second wall gap is provided between adjacent second wall monomers, and the second wall gap is connected to the second gap in a one-to-one correspondence; The first strip hole extends, and the second belt body is formed with a second strip hole extending along the length direction of the second belt body; the first strip hole has a first toothed edge extending along the length direction of the first belt body and a first toothless edge on the other side, and the second strip hole has a second toothless edge corresponding to the first toothed edge and a second toothed edge corresponding to the first toothless edge; the first rack is formed on the first toothed edge and corresponds to the second toothless edge, and the second rack is formed on the second toothed edge and corresponds to the first toothless edge; the retractable shell has a accommodating cavity for accommodating the gear; the sum of the thickness of the first rack and the second rack is less than or equal to the length of the gear; the accommodating cavity is provided with a first abutting wall abutting the first toothed edge and a second abutting wall abutting the second toothed edge.

4. The novel knob-type retractable watch strap according to any one of claims 1 to 3, characterized in that: The installation opening is provided with a toothed ring which matches with the claw teeth and is located at the outer ring of the anti-rotation elastic claw; the toothed ring includes a plurality of ring teeth surrounding the gear axis and facing the gear axis; the ring teeth are formed on the inner side wall of the installation opening; the installation opening includes a top cavity for accommodating the anti-rotation elastic claw, and a bottom cavity for accommodating the gear; The gear ring is formed in the top cavity, the first inlet and outlet and the second inlet and outlet are located in the bottom cavity and communicated with the bottom cavity; the retractable shell has a partition wall between the top cavity and the bottom cavity.

5. The novel knob-type retractable watch strap according to claim 4 is characterized in that: The retractable shell has a first surrounding wall surrounding the installation opening; the first surrounding wall is a full-circle surrounding wall; and the ring teeth are formed on the inner circle side surface of the first surrounding wall.

6. The novel knob-type retractable watch strap according to claim 5 is characterized in that: The retractable shell has a second surrounding wall located in the outer circle of the first surrounding wall; a side wall gap for accommodating the button side wall is provided between the first surrounding wall and the second surrounding wall.

7. The novel knob-type retractable watch strap according to claim 6 is characterized in that: The second surrounding wall has an operating notch for an operator to operate the anti-slip part; the second surrounding wall includes a surrounding wall monomer 1 corresponding to the first inlet and outlet, and a surrounding wall monomer 2 corresponding to the second inlet and outlet; two operating notches are formed between the surrounding wall monomer 1 and the surrounding wall monomer 2.

8. The novel knob-type retractable watch strap according to any one of claims 1 to 3, characterized in that: The retractable shell has a bottom wall located at the opposite side of the installation opening; the bottom wall has a wall connecting portion connected to the button column.

9. The novel knob-type retractable watch strap according to claim 8 is characterized in that: The wall connection part includes a connection hole and a convex ring surrounding the connection hole; the convex ring is formed on the inner side of the retractable shell and extends into the wheel through hole of the gear, and the convex ring is formed with a ring hole for the button column to pass through; a wheel groove for accommodating the lower end of the gear is formed on the inner side of the bottom wall, and the wheel groove is arranged around the convex ring; the connection hole has a thin diameter portion extending into the button column and clamping the clamping edge of the column clamping head; The outer side surface of the bottom wall is formed with a recessed groove for accommodating the column clamp; or, the bottom wall is formed with a protrusion surrounding the connecting hole.

10. A watch with a new type of knob-type retractable strap according to any one of claims 1 to 9, characterized in that: The device also includes a dial, which includes a first dial connecting portion connected to the first belt body and a second dial connecting portion connected to the second belt body.

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