Watch buckle and watch

Abstract

The utility model provides a kind of watch buckle and watch, the watch buckle includes: frame, form with through slot and first installation gap, and the frame on the both sides of first installation gap respectively has first mounting hole;Core, first end has second installation hole, the tail end of the core has second installation gap, and the core on the both sides of second installation gap respectively has third mounting hole;Face cover assembly, tail end has watchband connecting portion, the lower surface of the face cover assembly has protruding portion, and the protruding portion has fourth mounting hole;The first end of the core is embedded first installation gap and is assembled to frame by first pin shaft assembly, the protruding portion of the face cover assembly is embedded second installation gap and is assembled to core by second pin shaft assembly, and when the core and face cover assembly are stacked on frame, the watchband connecting portion of the tail end of the face cover assembly protrudes from the end of frame.The utility model can improve the comfort of watch wearing.

Description

Technical Field

[0001] This utility model relates to the field of watch wearing, and more specifically, to a watch buckle and a watch. Background Technology

[0002] When wearing a steel watch band with a butterfly clasp, the bezel is usually stacked underneath the band. This not only makes the overall thickness of this part larger, but also, because the bezel protrudes from the lower surface of the band, the band cannot fit well against the wrist, which can easily cause discomfort after wearing it for a long time. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a new watch buckle and watch, which addresses the issue that the frame of the watch buckle overlaps under the watch strap when the watch is worn, resulting in a large overall thickness.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is to provide a watch buckle for connecting a metal watch strap, comprising: A frame is formed with a through groove and a first mounting notch. The through groove is located on the upper surface of the frame and is arranged along the length direction of the metal watch band. The first mounting notch is located at the end of the frame, and the frame on both sides of the first mounting notch has a first mounting hole arranged along the width direction of the metal watch band. The core is made, the first end of which has a second mounting hole, the tail end of which has a second mounting notch, and the core on both sides of the second mounting notch has a third mounting hole arranged along the width direction of the metal watch band. The faceplate assembly has a strap connection portion at its tail end, and a protrusion on the lower surface of the faceplate assembly that matches the second mounting notch. The protrusion has a fourth mounting hole arranged along the width direction of the metal strap. The distance from the protrusion to the strap connection portion is greater than the distance from the beginning to the end of the core. The first end of the core is embedded in the first mounting notch and assembled to the frame through a first pin assembly passing through the first and second mounting holes. The protrusion of the faceplate assembly is embedded in the second mounting notch and assembled to the core through a second pin assembly passing through the third and fourth mounting holes. The core is stacked on the frame by rotating around the first pin assembly and the faceplate assembly is stacked on the frame by rotating around the second pin assembly. When the core and the faceplate assembly are stacked on the frame, the core is embedded in a through groove on the frame. The strap connection part at the tail end of the faceplate assembly is located on the same curved surface as the frame and protrudes from the end of the frame. As a further improvement of this utility model, the two sides of the frame are respectively provided with T-shaped grooves arranged along the width direction of the metal strap, the opening of the T-shaped groove is located on the upper surface of the frame, and the bottom of the T-shaped groove has a countersunk hole. The buckle includes two push-buttons and four elastic elements. The size of the push-buttons is adapted to the size of the head of the T-slot, and each push-button has a first screw hole and a through hole. The four elastic elements are respectively disposed on both sides of the head of the two T-slots. The two push-buttons are respectively embedded into the head of the two T-slots and are assembled into the T-slot of the frame by screws that are threaded to the first screw hole and inserted into the countersunk hole at the bottom of the T-slot. The countersunk hole is larger than the diameter of the screw in the width direction of the metal strap. The faceplate assembly has a locking pin, which includes a mushroom head. The diameter of the mushroom head is smaller than the diameter of the through hole. When the faceplate assembly is stacked on the frame, the mushroom head of the locking pin passes through the through hole of the pressing plate, and the elastic element pushes the pressing plate to lock the locking pin, thereby locking the faceplate assembly to the frame.

[0005] As a further improvement of this utility model, the lower surface of the pressing piece has a guide groove, the bottom opening of the through hole is located in the guide groove, and the guide groove is arranged along the width direction of the metal watch band and is adapted to the mushroom head of the locking pin.

[0006] As a further improvement of this utility model, the faceplate assembly has two rivet holes away from the strap connection part, and the two locking pins are respectively riveted into the two rivet holes with the mushroom head facing down. When the core and the faceplate assembly are stacked on the frame, the core is located between the two locking pins, and the mushroom heads of the two locking pins pass through the through holes on the two pressing pieces respectively.

[0007] As a further improvement of this utility model, the two ends of the pressing sheet in the width direction are respectively provided with lugs, and when the pressing sheet is assembled into the T-slot, the two lugs are respectively embedded in the two sides of the head of the T-slot. The two ends of the elastic member abut against the lugs and the inner side of the T-slot respectively. The elastic member pushes the lugs to make the outer edge of the pressing sheet protrude from the edge of the frame.

[0008] As a further improvement of this utility model, the faceplate assembly includes a faceplate body and a telescopic adjustment piece, and the strap connection part is located at the tail end of the telescopic adjustment piece; the lower surface of the faceplate body has a sliding groove arranged along the length direction of the metal strap, and the two side walls of the sliding groove along the length direction of the metal strap each have a set of limiting holes, each set of limiting holes including a plurality of blind holes arranged along the length direction of the metal strap; the telescopic adjustment piece has two side walls perpendicular to the width direction of the metal strap each have spring pins, and the telescopic adjustment piece is embedded in the sliding groove of the faceplate body and connected to the faceplate body by means of the spring pins being embedded in the limiting holes. As a further improvement of this utility model, the face cover body includes a bottom plate and two side plates, the two side plates are respectively located on both sides of the bottom plate, the sliding groove is located between the bottom plate and the two side plates, and when the core and face cover assembly are stacked on the frame, the two side plates respectively wrap around both sides of the frame. Each side plate has a second screw hole, and the telescopic adjustment piece in the sliding groove is locked and fixed by a set screw connected to the second screw hole through a thread.

[0009] As a further improvement of this utility model, two first mounting notches are formed on the frame, and the two first mounting notches are respectively located at both ends of the frame; the buckle includes two cores and two cover assemblies, the two cores are respectively assembled to the two first mounting notches through first pin assemblies, and the two cover assemblies are respectively assembled to the two cores through second pin assemblies.

[0010] As a further improvement of this utility model, one of the faceplate components includes a faceplate pressure plate, and the faceplate body of the faceplate component has a groove and a clearance notch at one end away from the strap connection part; the groove is located on the upper surface of the faceplate body and is connected to the clearance notch, the faceplate pressure plate is embedded into the groove and covers the clearance notch, and the faceplate pressure plate is assembled to the faceplate body by means of a snap fastener on the lower surface engaging with a snap hole on the bottom wall of the groove; Another faceplate assembly has a tab on its main body that is away from the strap connection. When the two cores and the two faceplate assemblies are stacked on the frame, the tab is inserted into an avoidance notch and the faceplate pressure plate is stacked on the tab. This utility model also provides a watch, including a watch head, a metal watch band and a watch buckle as described above, wherein the two ends of the metal watch band are respectively connected to the watch band connecting parts of the watch head and the watch buckle.

[0011] The present invention has the following advantages: by setting a through groove on the upper surface of the frame and making the strap connection part at the tail end of the faceplate assembly located on the same curved surface as the frame and protruding from the end of the frame when the faceplate assembly is stacked on the frame, the strap and the frame are avoided from overlapping when the watch is worn, thus improving the comfort of wearing the watch. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the buckle provided in an embodiment of the present utility model.

[0013] Figure 2 This is a schematic diagram of the watch buckle in the open state of the face cover assembly according to an embodiment of the present invention.

[0014] Figure 3 This is an exploded structural diagram of the watch buckle provided in an embodiment of this utility model.

[0015] Figure 4This is a cross-sectional structural diagram of the watch buckle at the locking pin provided in an embodiment of this utility model.

[0016] Figure 5 This is a schematic diagram of the bottom structure of the main body of the watch buckle provided in this embodiment of the utility model.

[0017] Figure 6 This is a schematic diagram of the bottom structure of the telescopic adjustment piece in the buckle provided in this embodiment of the utility model.

[0018] Figure 7 This is a schematic diagram of the bottom structure of the snap fastener provided in this embodiment of the utility model.

[0019] Figure 8 This is a schematic diagram of the bottom structure of the cover plate of the watch buckle provided in this embodiment of the utility model.

[0020] Figure 9 This is a schematic diagram of the buckle provided in this embodiment of the present invention for adjusting the wearing length. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0022] like Figure 1-2 The diagram shows a structural schematic of a watch buckle provided in this embodiment of the present invention. This buckle can be used to connect a metal watch band (e.g., a steel watch band) and to achieve watch wearing together with the metal watch band. The buckle in this embodiment includes a frame 10, a core 20, and a faceplate assembly 30. The frame 10, core 20, and faceplate assembly 30 can all be made of metal (e.g., stainless steel) or similar hard materials. The two ends of the core 20 are pivotally connected to the frame 10 and the faceplate assembly 30, respectively. The core 20 can be rotated relative to the frame 10, and the faceplate assembly 30 can be rotated relative to the core 20, so that the core 20 and the faceplate assembly 30 are sequentially stacked on the frame 10 (e.g., ...). Figure 1 (as shown), or to separate the core 20 from the frame 10 and the faceplate assembly 30 from the core 20 (as shown). Figure 2 (As shown).

[0023] Combination Figure 3 As shown, the frame 10 has a through groove 11 and a first mounting notch 12 formed thereon, wherein the through groove 11 is located on the upper surface of the frame 10 and along the length of the metal watchband (e.g., Figure 3 As indicated by arrow X in the image, the first mounting notch 12 is located at the end of the frame 10, and the frame 10 on both sides of the first mounting notch 12 has a notch along the width direction of the metal watchband (e.g., as indicated by arrow X in the image). Figure 3 The first mounting hole 13 (pointed to by arrow X in the image) is provided, meaning the central axis of the first mounting hole 13 is set along the width direction of the metal watch band. Those skilled in the art will understand that the frame 10 is generally sheet-like, and its dimension along the width direction of the metal watch band is smaller than its dimension along the length direction of the metal watch band; the first mounting notch 12 penetrates the upper and lower surfaces of the frame 10, and the dimension of the first mounting notch 12 in the width direction of the metal watch band is the same as the dimension of the through groove 11 in the width direction of the metal watch band; the first mounting holes 13 on both sides of the first mounting notch 12 are coaxial.

[0024] The first end of the core 20 has a second mounting hole 21, and the second end of the core 20 has a second mounting notch 22. On both sides of the second mounting notch 22, the core 20 has third mounting holes 23 arranged along the width direction of the metal watch band, i.e., the central axis of the third mounting holes 23 is arranged along the width direction of the metal watch band. Those skilled in the art will understand that the core 2 is generally sheet-like, and its shape and size are adapted to the shape and size of the through groove 11 on the frame 10, so that the core 2 can be embedded in the through groove 11 without significant shaking; the second mounting notch 22 penetrates the upper and lower surfaces of the core 20, and the third mounting holes 23 on both sides of the second mounting notch 22 are coaxial.

[0025] The tail end of the faceplate assembly 30 has a strap connection portion 31, to which a metal watch strap can be fitted. Its specific structure is similar to the mounting structure of existing steel watch straps and will not be described in detail here. Figure 5 As shown, the lower surface of the faceplate assembly 30 has a protrusion 325, the shape and size of which are adapted to the shape and size of the second mounting notch 22 on the core 20, so that the protrusion 325 can be inserted into the second mounting notch 22; the protrusion 325 has a fourth mounting hole 3251 provided along the width direction of the metal watch band, and when the protrusion 325 is fully inserted into the second mounting notch 22 (for example, the lower surface of the faceplate assembly 30 is in contact with the upper surface of the core 20), the fourth mounting hole 3251 is coaxial with the third mounting hole 23.

[0026] The first end of the core 20 is inserted into the first mounting notch 12 (until the first mounting hole 13 and the second mounting hole 21 are coaxial) and is assembled to the frame 10 by a first pin assembly 14 passing through the first mounting hole 13 and the second mounting hole 21; the protrusion 325 of the faceplate assembly 30 is inserted into the second mounting notch 22 (until the third mounting hole 23 and the fourth mounting hole 3251) and is assembled to the core 20 by a second pin assembly 24 passing through the third mounting hole 23 and the fourth mounting hole 3251. The core 20 is stacked on the frame 10 by rotating around the first pin assembly and the faceplate assembly 30 is stacked on the frame 10 by rotating around the second pin assembly. When the core 20 and the faceplate assembly 30 are stacked on the frame 10, the core 20 is inserted into the through slot 11 on the frame 10. The strap connection portion 31 at the tail end of the faceplate assembly 30 is located on the same curved surface as the frame 10 (the curved surface is adapted to the wrist surface) and protrudes from the end of the frame 10 (the end along the length direction of the metal strap). In practical applications, the first pin assembly 14 and the second pin assembly 24 can both adopt conventional structures in the art, as long as the two connected parts can rotate relative to each other. For example, the first pin assembly 14 is composed of a double-stage tube and two double-stage pins.

[0027] The aforementioned buckle, by providing a through groove 11 on the upper surface of the frame 10 and ensuring that the strap connection portion 31 at the tail end of the faceplate assembly 30 is located on the same curved surface as the frame 10 and protrudes from the end of the frame 10 when the watch is worn, avoids the strap overlapping with the frame 10 and improves the comfort of wearing the watch.

[0028] In one embodiment of this utility model, the two sides of the frame 10 (i.e. Figure 3 The two T-slots 15 are respectively located in the direction indicated by the middle arrow X. The two T-slots 15 are respectively set along the width direction of the metal watch band, and the opening of the T-slot 15 is located on the upper surface of the frame 10. The bottom of the T-slot 15 has a countersunk hole 151.

[0029] Accordingly, the buckle of this embodiment also includes two push-button tabs 41 and four elastic members 42, wherein the size (including shape) of the push-button tabs 41 is adapted to the size (including shape) of the head of the T-slot 15, that is, the push-button tabs 41 can be inserted into the head of the T-slot 15 from the side of the T-slot 15, and can slide within the T-slot 15 along the width direction of the metal strap, without coming out from the neck of the T-slot 15. Each push-button tab 41 has a first screw hole 412 and a through hole 411. Four elastic elements 42 are respectively disposed on both sides of the head of the two T-slots 15. Two pushers 41 are respectively embedded into the head of the two T-slots 15 and are assembled into the T-slots 15 of the frame 10 by screws 43 that are threaded to the first screw hole 412 and inserted into the countersunk hole 151 at the bottom of the T-slot 15. The countersunk hole 151 is larger than the diameter of the screw 43 in the width direction of the metal strap. That is, the screw 43 and the countersunk hole 151 cooperate so that the pushers 41 can only slide within a certain range in the T-slots 15. The elastic elements 42 can be compression springs. When there is no external force pressing the pushers 41, the elastic elements 42 push the pushers 41 to the outermost position of the T-slot 15, that is, protruding from the outer edge of the frame 10.

[0030] Combination Figure 3 As shown, the faceplate assembly 30 has a locking pin 36, which includes a mushroom head 361 and a neck located inside the mushroom head 361 (those skilled in the art will understand that the diameter of the neck is smaller than the diameter of the mushroom head 361). The diameter of the mushroom head 361 is smaller than the diameter of the through hole 411. When the faceplate assembly 30 is stacked on the frame 10, the mushroom head 361 of the locking pin 36 passes through the through hole 411 of the pressing plate 41, and the elastic member 42 pushes the pressing plate 41 to lock the locking pin 36. That is, the mushroom head 361 is located below the through hole 411, and the neck of the locking pin 36 abuts against the inner side of the through hole 411. Figure 4 As shown, the faceplate assembly 30 is then locked to the frame 10, allowing the watch to be worn. When it is necessary to remove the watch, the pressing plate 41 can be pressed against the inside of the frame 10 to compress the elastic element 42. When the through hole 411 is coaxial with the locking pin 36, the mushroom head 361 passes through the through hole 411 and comes out from the pressing plate 41, thereby unlocking the faceplate assembly 30. The faceplate assembly 30 and the movement 20 can then be separated from the frame 10.

[0031] The above structure facilitates locking and unlocking of the faceplate assembly 30. In particular, the free end of the mushroom head 361 may have a chamfer, so that by pressing the faceplate assembly 30, the mushroom head 361 can push the pusher 41 to move, thereby allowing the mushroom head 361 to pass through the through hole 411 for easy wearing of the watch.

[0032] like Figure 7As shown, in one embodiment of this invention, the lower surface of the aforementioned clip 41 has a guide groove 413, the bottom opening of the through hole 411 is located within the guide groove 413, and the guide groove 413 is arranged along the width direction of the metal watch band and is adapted to the mushroom head 361 of the locking pin 36. When the clip 41 slides along the width direction of the metal watch band, the mushroom head 361 of the locking pin 36 slides along the guide groove 413. This structure helps to reduce the thickness of the watch buckle.

[0033] In one embodiment of this utility model, the faceplate assembly 30 has two riveting holes 3261 located away from the strap connection portion. Two locking pins 36 are riveted into the two riveting holes 3261 with their mushroom heads 361 facing downwards. When the core 20 and the faceplate assembly 30 are stacked on the frame 10, the core 20 is located between the two locking pins 36, and the mushroom heads 361 of the two locking pins 36 pass through the through holes 411 on the two push-button pieces 41. This structure not only facilitates the assembly of the faceplate assembly 30, but also allows the faceplate assembly 30 to be stably locked to the push-button pieces 41.

[0034] Combination Figure 7 As shown, in one embodiment of this utility model, the two ends of the pressing sheet 41 in the width direction are respectively provided with lugs 414. When the pressing sheet 41 is assembled into the T-slot 15, the two lugs 414 are respectively embedded into the two sides of the head of the T-slot 15 (i.e., protruding from the neck of the T-slot 15). The two ends of the elastic member 42 abut against the lugs 414 and the inner side of the T-slot 15 respectively. The elastic member 42 pushes the lugs 414 so that the outer edge of the pressing sheet 41 protrudes to the edge of the frame 10. The above structure facilitates the assembly of the elastic member 42 and the pressing sheet 41 into the T-slot 15 of the frame 10.

[0035] Combination Figure 3 , Figure 5 and Figure 6 As shown, in one embodiment of this utility model, the faceplate assembly 30 includes a faceplate body 32 and a telescopic adjustment piece 33, wherein the strap connection portion 31 is located at the tail end of the telescopic adjustment piece 33. A sliding groove 324 is formed on the lower surface of the faceplate body 32 along the length direction of the metal strap, and each of the two sidewalls of the sliding groove 324 along the length direction of the metal strap has a set of limiting holes 323, each set of limiting holes including multiple blind holes arranged along the length direction of the metal strap; correspondingly, spring pins 34 are respectively provided on the two sidewalls of the telescopic adjustment piece 33 perpendicular to the width direction of the metal strap. The head of the spring pin 34 protrudes from the sidewall of the telescopic adjustment piece 33 when subjected to external pressure, and the telescopic adjustment piece 33 is embedded in the sliding groove 324 of the faceplate body 32 and connected to the faceplate body 32 by means of the spring pins 34 being embedded in the limiting holes.

[0036] Those skilled in the art will understand that the width of the telescopic adjustment piece 33 is adapted to the width of the sliding groove 324. By pushing the spring pin 34 on the telescopic adjustment piece 33 into different limiting holes, the relative position of the strap connection part 31 and the frame 10 can be changed, thereby achieving fine adjustment of the watch wearing length.

[0037] Specifically, the two sidewalls of the sliding groove 324 along the length of the metal strap each have a second screw hole 3263. The telescopic adjustment piece 33 in the sliding groove 324 can be locked and fixed by the set screw 37 threaded to the second screw hole 3263, thereby improving the stability of the connection between the telescopic adjustment piece 33 and the face cover body 32.

[0038] Combination Figure 9 As shown, when it is necessary to adjust the wearing length of the watch, you can first use a screwdriver or similar tool to turn the set screw 37 in the second screw hole 3263 to loosen the telescopic adjustment piece 33, and then push the telescopic adjustment piece 33 to slide in the sliding groove 324 so that the spring wave pin 34 is embedded in different limit holes. After the adjustment is in place, use a screwdriver or similar tool to tighten the set screw 37, and then lock and fix the telescopic adjustment piece 33.

[0039] In one embodiment of this utility model, the faceplate body 32 includes a base plate 321 and two side plates 322, which are located on both sides of the base plate 321. Specifically, the base plate 321 and the side plates 322 can be an integral structure. A sliding groove 324 is located between the base plate 321 and the two side plates 322, and a limiting hole group 323 is located inside the two side plates 322. When the core 20 and the faceplate assembly 30 are stacked on the frame 10, the two side plates 322 respectively wrap around both sides of the frame 10, with only the sheet 41 exposed. Figure 1 As shown. This structure prevents the movement 20 and frame 10 from being exposed when the watch is worn, improving the consistency of the clasp's appearance.

[0040] In one embodiment of this utility model, two first mounting notches 12 are formed on the frame 10, and the two first mounting notches 12 are respectively located at both ends of the frame 10; correspondingly, the clasp includes two cores 20 and two faceplate assemblies 30. The two cores 20 are respectively assembled to the two first mounting notches 12 via first pin assemblies, and the two faceplate assemblies 30 are respectively assembled to the two cores 20 via second pin assemblies. In this way, the frame 10, the two cores 20 and the two faceplate assemblies 30 form a butterfly-shaped structure, which greatly increases the overall length of the watch when the clasp is loosened, making it easier to take off and wear the watch.

[0041] Combination Figures 3-5 , Figure 8As shown, in one embodiment of this utility model, one of the faceplate assemblies 30 includes a faceplate pressure plate 35, and the faceplate body 32 of the faceplate assembly 30 has a groove 328 and a clearance notch 329 at one end away from the strap connection portion 31. The groove 328 is located on the upper surface of the faceplate body 32 and is connected to the clearance notch 329. The faceplate pressure plate 35 is embedded into the groove 328 and covers the clearance notch 329. The faceplate pressure plate 35 is assembled to the faceplate body 32 by means of a snap fastener 351 on the lower surface engaging with a snap hole 3262 on the bottom wall of the groove 328. The rivet hole 3261 and the snap hole 3262 may both be located on the bottom wall of the groove 328. Correspondingly, the other faceplate assembly 30 has a tab 327 on its faceplate body 32 that is away from the strap connection portion 31. When the two cores 20 and the two faceplate assemblies 30 are respectively stacked on the frame 10, the tab 327 is inserted into the clearance notch 329, and the faceplate pressure plate 35 is stacked on the tab 327. In this way, when the watch is worn, the two faceplate assemblies 30 completely cover the upper surface of the frame 10, improving the consistency of the clasp.

[0042] In addition, the lower surface of the cover plate 35 may have a recess 352 at the position corresponding to the locking pin 36, and the top of the locking pin 36 may be embedded in the recess 352, thereby ensuring that the cover plate 35 can fit against the bottom wall of the groove 328 and the upper surface of the tongue 327.

[0043] This utility model also provides a watch, including a watch head, a metal watch band and a watch buckle as described above, wherein the two ends of the metal watch band are respectively connected to the watch band connecting parts of the watch head and the watch buckle.

[0044] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A buckle for connecting a metal watchband, characterized by, include: A frame is formed with a through groove and a first mounting notch. The through groove is located on the upper surface of the frame and is arranged along the length direction of the metal watch band. The first mounting notch is located at the end of the frame, and the frame on both sides of the first mounting notch has a first mounting hole arranged along the width direction of the metal watch band. The core is made, the first end of which has a second mounting hole, the tail end of which has a second mounting notch, and the core on both sides of the second mounting notch has a third mounting hole arranged along the width direction of the metal watch band. The faceplate assembly has a strap connection portion at its tail end, and a protrusion on the lower surface of the faceplate assembly that matches the second mounting notch. The protrusion has a fourth mounting hole arranged along the width direction of the metal strap. The distance from the protrusion to the strap connection portion is greater than the distance from the beginning to the end of the core. The first end of the core is embedded in the first mounting notch and assembled to the frame through a first pin assembly passing through the first and second mounting holes. The protrusion of the faceplate assembly is embedded in the second mounting notch and assembled to the core through a second pin assembly passing through the third and fourth mounting holes. The core is stacked on the frame by rotating around the first pin assembly and the faceplate assembly is stacked on the frame by rotating around the second pin assembly. When the core and the faceplate assembly are stacked on the frame, the core is embedded in a through groove on the frame. The strap connection part at the tail end of the faceplate assembly is located on the same curved surface as the frame and protrudes from the end of the frame.

2. The clasp of claim 1, wherein The frame has T-shaped grooves on both sides, which are arranged along the width direction of the metal strap. The opening of the T-shaped groove is located on the upper surface of the frame, and the bottom of the T-shaped groove has a countersunk hole. The buckle includes two push-buttons and four elastic elements. The size of the push-buttons is adapted to the size of the head of the T-slot, and each push-button has a first screw hole and a through hole. The four elastic elements are respectively disposed on both sides of the head of the two T-slots. The two push-buttons are respectively embedded into the head of the two T-slots and are assembled into the T-slot of the frame by screws that are threaded to the first screw hole and inserted into the countersunk hole at the bottom of the T-slot. The countersunk hole is larger than the diameter of the screw in the width direction of the metal strap. The faceplate assembly has a locking pin, which includes a mushroom head. The diameter of the mushroom head is smaller than the diameter of the through hole. When the faceplate assembly is stacked on the frame, the mushroom head of the locking pin passes through the through hole of the pressing plate, and the elastic element pushes the pressing plate to lock the locking pin, thereby locking the faceplate assembly to the frame.

3. The clasp of claim 2, wherein, The lower surface of the pressing piece has a guide groove, the bottom opening of the through hole is located in the guide groove, and the guide groove is arranged along the width direction of the metal strap and is adapted to the mushroom head of the locking pin.

4. The clasp of claim 2, wherein The faceplate assembly has two rivet holes away from the strap connection. The two locking pins are riveted into the two rivet holes with their mushroom heads facing down. When the core and faceplate assembly are stacked on the frame, the core is located between the two locking pins, and the mushroom heads of the two locking pins pass through the through holes on the two pressing plates.

5. The clasp of claim 2, wherein The pressing sheet has lugs at both ends in the width direction. When the pressing sheet is assembled into the T-slot, the two lugs are respectively embedded in the two sides of the head of the T-slot. The two ends of the elastic member abut against the lugs and the inner side of the T-slot, respectively. The elastic member pushes the lugs to make the outer edge of the pressing sheet protrude from the edge of the frame.

6. The clasp of claim 1, wherein The faceplate assembly includes a faceplate body and a telescopic adjustment piece, with the strap connection located at the tail end of the telescopic adjustment piece. A sliding groove is formed on the lower surface of the faceplate body along the length of the metal strap, and each of the two sidewalls of the sliding groove along the length of the metal strap has a set of limiting holes, each set including multiple blind holes arranged along the length of the metal strap. The telescopic adjustment piece has spring pins on two sidewalls perpendicular to the width of the metal strap. The telescopic adjustment piece is embedded in the sliding groove of the faceplate body and connected to the faceplate body by the spring pins being embedded in the blind holes.

7. The clasp of claim 6, wherein The main body of the cover includes a base plate and two side plates, which are located on both sides of the base plate. The sliding groove is located between the base plate and the two side plates. When the core and cover assembly are stacked on the frame, the two side plates wrap around both sides of the frame. Each side plate has a second screw hole, and the telescopic adjustment piece in the sliding groove is locked and fixed by a set screw connected to the second screw hole through a thread.

8. The clasp of claim 4, wherein, The frame has two first mounting notches, which are located at both ends of the frame. The buckle includes two cores and two cover assemblies. The two cores are respectively assembled to the two first mounting notches via first pin assemblies, and the two cover assemblies are respectively assembled to the two cores via second pin assemblies.

9. The clasp of claim 8, wherein, One of the faceplate assemblies includes a faceplate plate, and the faceplate body of the faceplate assembly has a groove and a clearance notch at one end away from the strap connection; the groove is located on the upper surface of the faceplate body and is connected to the clearance notch, the faceplate plate is embedded into the groove and covers the clearance notch, and the faceplate plate is assembled to the faceplate body by means of a snap fastener on the lower surface engaging with a snap hole on the bottom wall of the groove; Another faceplate assembly has a tab on its main body that is away from the strap connection. When the two cores and the two faceplate assemblies are stacked on the frame, the tab is inserted into an avoidance notch and the faceplate pressure plate is stacked on the tab.

10. A watch characterized by It includes a watch head, a metal watch band, and a watch buckle as described in any one of claims 1-9, wherein both ends of the metal watch band are respectively connected to the watch band connecting portions of the watch head and the watch buckle.

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