Gravity self-locking support

Abstract

The utility model provides a gravity self -locking support belongs to support technical field, including casing, clamping component and locking assembly, and the casing is limited to clamping component and locking assembly and carries out location fixed, clamping component includes two cantilever, rocker piece I, rocker piece II and the hook, locking assembly includes the buckle and the button, and the technical scheme of the application can realize firm clamping and gravity self -locking, compact structure.

Description

Technical Field

[0001] This utility model relates to the field of bracket technology, and in particular to a clamping bracket for electronic devices with a self-locking function. Background Technology

[0002] Brackets used to hold electronic devices are ubiquitous in daily life. Some brackets use elastic force to hold electronic devices, while others use gravity to hold them, and they have different structural features.

[0003] Patent document 1 (CN 113965635A) discloses a gravity-driven swing arm mobile phone holder, wherein one end of the swing arm is a gear end and the other end is a clamping end. The gear end meshes with a slide plate with two parallel straight racks to realize the swing arm swinging up and down. It cooperates with the bracket to achieve the purpose of clamping the mobile phone. A locking block is set on the bracket support plate of the bracket. The locking block relies on the weight of the mobile phone to engage and lock with the teeth on the slide plate.

[0004] The aforementioned support structure is complex, with non-standard racks and teeth being machined. The swing arm swings up and down, and there is a clearance hole at the root of the swing arm. As the usage time increases, dirt will accumulate in the clearance hole, which is not easy to clean.

[0005] Patent document 2 (CN 119996551A) discloses a mobile phone holder and its clamping mechanism. The holder assembly has a gear rotatably mounted in the center via a pivot shaft. First sliding frames are slidably mounted on both sides of the holder assembly, and each of the first sliding frames has a first rack fixed to it to mesh with the gear. A second sliding frame is slidably mounted at the bottom of the holder assembly, and a second rack fixed to it to mesh with the gear. The three sliding frames cooperate with each other, and the rotation of the gear achieves clamping and limiting of the mobile phone on both sides.

[0006] The first sliding frame of the aforementioned mobile phone holder extends horizontally left and right without needing to increase the size of the clearance hole, thus solving the problem of dirt accumulation. The first and second sliding frames overlap and mesh with the gear, increasing the thickness of the holder assembly. At the same time, it is also necessary to consider how to prevent the first sliding frame from disengaging from the gear.

[0007] Design schemes with the above two structures can also be found in patent documents CN209823823U, CN218603508U, CN218830033U, CN219592440U, CN221283233U and CN222940837U. Utility Model Content

[0008] The technical solution disclosed in this application can achieve gravity self-locking, with a compact bracket structure and stable clamping and locking.

[0009] A gravity self-locking bracket includes a housing, a clamping assembly, and a locking assembly, wherein the housing limits and fixes the clamping assembly and the locking assembly;

[0010] The housing includes an upper cover and a lower cover, the upper cover and the lower cover forming a space for accommodating the clamping assembly and the locking assembly;

[0011] The clamping assembly includes two cantilever arms, rocker arm I, rocker arm II, and hook;

[0012] One end of the cantilever is bent into a clamping part, and a notch is constructed on the side of the other end. A long hole of the cantilever is constructed on the side of the notch. The long axis of the long hole of the cantilever is parallel to the short side of the cantilever. The two cantilevers are arranged in opposite directions, and the two clamping parts face the same side.

[0013] The rocker arm I is a semi-circular gear structure with a positioning hole I, and the rocker arm I is formed by horizontally extending from both ends of the gear structure. The end of the rocker arm I is provided with a positioning post I that can be assembled with the cantilever elongated hole. A rocker arm II is constructed between the two rocker arms I facing away from the gear structure. The end of the rocker arm II is provided with a positioning post II.

[0014] The rocker arm component II is a gear component with a positioning hole II. The side of the gear component extends out of the rocker arm III. The end of the rocker arm III is constructed with a positioning post III. The rocker arm component II is meshed with the rocker arm component I.

[0015] The hook includes a hook body and two parallel legs extending from one end of the hook body. The legs have elongated holes at the ends away from the hook body, with the major axis of the elongated holes parallel to the short side of the legs. The two elongated holes are respectively fitted to the positioning post II and the positioning post III. An elastic element is provided on the hook body, and the other end of the elastic element is fixed to the bottom shell. The hook is fitted below the cantilever.

[0016] Preferably, the cantilever is a strip-shaped structure.

[0017] Preferably, the notch of one of the two cantilever arms abuts against the side of the notch of the other cantilever arm.

[0018] Preferably, the top of rocker arm II is lower than the top of rocker arm I, and the top of positioning post II is lower than the top of rocker arm I; the top of rocker arm III is lower than the top of the gear component, and the top of positioning post III is lower than the top of the gear component; the gear structure has the same tooth profile parameters as the gear component and has the same height.

[0019] Preferably, the support leg is a strip-shaped structure.

[0020] Preferably, the locking assembly includes a buckle and a button;

[0021] The buckle has a positioning hole III and a locking part extending from the side of the positioning hole III. The locking part can engage with the gear component. The buckle has an inclined groove with an outward inclined surface at one end away from the locking part. A blind hole I for accommodating the spring I is opened at a position away from the central axis of the positioning hole III and close to the locking part.

[0022] The button has a button and two support legs extending parallel to the end of the button. A pivot II is constructed on the inward side of the two support legs. A convex shaft I and a convex shaft II are constructed on the outer side of one of the support legs. A downward blind hole II for accommodating a spring II is constructed between the support legs near the end of the button.

[0023] The buckle is assembled with the button, the spring I abuts against the convex shaft I, and the inclined groove matches the convex shaft II.

[0024] This utility model's gravity self-locking bracket uses a clamping component to hold an item placed on the bracket. When the item presses the button, the locking component locks the clamping component, achieving stable clamping and fixation. Attached Figure Description

[0025] Referring to the accompanying drawings, the drawings used in the following description of the embodiments or prior art will be briefly introduced. Obviously, the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model.

[0026] Figure 1 This is a three-dimensional structural diagram of the stent involved in this application;

[0027] Figure 2 This is a schematic diagram of the split structure of the stent involved in this application;

[0028] Figure 3 This is a three-dimensional structural diagram of the cantilever involved in this application;

[0029] Figure 4 This is a three-dimensional structural diagram of rocker arm I and rocker arm II involved in this application;

[0030] Figure 5 This is a three-dimensional structural diagram of the clamping component involved in this application;

[0031] Figure 6 This is a three-dimensional structural diagram of some of the clamping components involved in this application assembled onto the base shell;

[0032] Figure 7 This is a three-dimensional structural diagram of the buckle involved in this application;

[0033] Figure 8 This is a three-dimensional structural diagram of the button involved in this application;

[0034] Figure 9 This is a three-dimensional structural diagram of the button involved in this application from another perspective;

[0035] Figure 10 This is a three-dimensional structural diagram of the locking components involved in this application assembled onto the base shell;

[0036] Figure 11 This is a side view of the assembly of the snap fastener and button with the convex shaft II involved in this application.

[0037] Explanation of icon numbers:

[0038] 10. Gravity self-locking bracket;

[0039] 11. Housing; 111. Top cover; 1111. Through hole; 112. Bottom shell; 1121. Positioning pin; 1122. Fixed shaft; 1123. Fixed seat; 1124. Pivot I; 1125. Baffle;

[0040] 12. Clamping assembly;

[0041] 121. Cantilever; 1211. Clamping part; 1212. Notch; 1213. Elongated hole; 1214. Short side of the cantilever; 12a. Long axis of the elongated hole; 12b. Central axis of the cantilever;

[0042] 122. Rocker arm I; 1221. Positioning hole I; 1222. Gear structure; 1223. Rocker arm I; 1224. Positioning post I; 1225. Rocker arm II; 1226. Positioning post II;

[0043] 123. Rocker arm II; 1231. Positioning hole II; 1232. Gear; 1233. Rocker arm III; 1234. Positioning pin III;

[0044] 124. Hook; 1241. Hook body; 1242. Support leg; 1243. Elastic element; 1244. Bending part; 1245. Elongated hole;

[0045] 13. Locking components;

[0046] 131. Buckle; 1311. Positioning hole III; 1312. Engaging part; 1313. Slanted groove; 1314. Blind hole I; 1315. Spring I;

[0047] 132. Button; 1321. Button; 1322. Support leg; 1323. Pivot II; 1324. Cam shaft I; 1325. Cam shaft II; 1326. Blind hole II; 1327. Spring II.

[0048] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure.

[0050] like Figure 1 As shown, the gravity-locking bracket 10 includes a clamping component and a locking component. The clamping component is used to clamp electronic devices, such as mobile phones, iPads, and displays; it can also clamp other items, such as picture frames, plates, and drawing boards. The locking component is used to lock the clamping component, ensuring that it is not affected by vibration, impact, or other factors that could cause it to fall off or become loosely clamped while it is clamped. Furthermore, this bracket features a stable structure and a small thickness. It can be fixed to a support to form a mobile phone holder, fixed to a telescopic rod to form a selfie stick, or fixed to a wall to form a load-bearing bracket for clamping displays or other items. This application does not limit the method of fixing the bracket.

[0051] Figure 2 An exploded perspective view of the gravity self-locking bracket 10 is shown. The bracket 10 includes a housing 11, a clamping assembly 12, and a locking assembly 13. The clamping assembly and the locking assembly are limited and fixed by the housing 11 to satisfy the assembly relationship.

[0052] The housing 11 includes an upper cover 111 and a bottom shell 112. The upper cover and bottom shell can be made of rigid plastic or easily moldable metal. The bottom shell has multiple positioning posts and multiple groove structures for limiting and fixing the clamping and locking components. Therefore, the structure of the bottom shell can be manufactured by injection molding or casting, reducing the difficulty of production and processing. The upper cover and bottom shell together form a space for accommodating the clamping and locking components.

[0053] The clamping assembly 12 includes two cantilever arms 121, rocker arm I 122, rocker arm II 123, and hook 124.

[0054] like Figure 3 As shown, the cantilever 121 is a strip-shaped structure. One end of the cantilever is bent inward to form a clamping part 1211. The other end of the cantilever has a notch 1212 on its side. An elongated hole 1213 is constructed on the side of the notch 1212. The major axis 12a of the elongated hole is parallel to the short side 1214 of the cantilever. Two cantilever structures with the same structure are arranged in opposite directions, as shown. Figure 5As shown, the clamping portions 1211 of the cantilever face the same side, and the notch 1212 of one cantilever mates with the side of the notch of the other cantilever. In some embodiments, the notch 1212 of one cantilever abuts against the side of the notch of the other cantilever, allowing the two cantilever to extend and retract left and right. The length of the notch is sufficient to allow the cantilever to move a certain distance for left and right extension and retraction, thus improving the stability of the cantilever during extension and retraction. In some embodiments, the notch is opened along the central axis 12b of the cantilever. When the two cantilevers are arranged in opposite directions, it can be ensured that the clamping portions of the cantilever extend and retract on a horizontal plane.

[0055] like Figure 4 As shown, one end of the rocker arm I 122 is a semi-circular gear structure 1222 with a positioning hole I 1221. Rocker arms I 1223 extend horizontally from both ends of the gear structure, and a positioning post I 1224 extends from the end of the rocker arm I. The positioning post I can be fitted into the elongated hole 1213 of the cantilever 121, as shown. Figure 5 As shown, during the rotation of rocker arm I around positioning hole I, positioning post I on rocker arm I drives two cantilever arms to extend and retract left and right, and at the same time reciprocates up and down within the elongated hole.

[0056] Please continue reading Figure 4 A rocker arm II 1225 is constructed between the rocker arm I 1223 and the back gear structure 1222, with a positioning post II 1226 extending from the end of the rocker arm II. The top of the rocker arm II 1225 is lower than the top of the rocker arm I 1223, and the top of the positioning post II 1226 is slightly lower than the top of the rocker arm I 1223. This construction facilitates the mounting of the hook 124 below the cantilever 121, which will be described in detail below.

[0057] Please continue reading Figure 4 The difference between rocker arm II 123 and rocker arm I 122 is that it does not have a structure similar to rocker arm I 1223, but retains a structure similar to rocker arm II 1225. Specifically, it has a gear arm 1232 with a positioning hole II 1231, a rocker arm III 1233 extending from the side of the gear arm 1232, and a positioning post III 1234 extending from the end of the rocker arm III. The top of the rocker arm III is lower than the top of the gear arm 1232, and the top of the positioning post III is slightly lower than the top of the gear arm 1232. This structure also facilitates the assembly of the hook 124.

[0058] It should be noted that the gear structure 1222 of rocker arm I 122 and the gear 1232 of rocker arm II 123 have the same tooth profile parameters (including module, pressure angle and base circle radius), that is, rocker arm I 122 and rocker arm II 123 can mesh and transmit power, and when the lengths of rocker arm II 1225 and rocker arm III 1233 are the same, the swing distance is equal or approximately equal.

[0059] It should be noted that the top of the gear structure 1222 of rocker arm I 122 is flush with the gear 1232 of rocker arm II 123 when they mesh.

[0060] See Figure 5 The hook 124 includes a hook body 1241 and a strip-shaped support leg 1242 extending from one end of the hook body. In some embodiments, two parallel support legs 1242 extend from one end of the hook body, and an elastic element 1243 is provided in the middle of the two support legs. One end of the elastic element is fixed to the hook body, and the other end of the elastic element is fixed to the bottom shell 112 to provide a reset elastic force.

[0061] See also Figure 5 In some embodiments, a bend 1244 is provided near the area where the support leg 1242 connects to the hook body 1241, which avoids the need to open a long slot on the bottom shell 112.

[0062] The support leg 1242 has an elongated hole 1245 at one end away from the hook body 1241. The long axis of the elongated hole is parallel to the short side of the support leg. The positioning pin II 1226 on the rocker arm I 122 can be installed in the elongated hole 1245 of the support leg 1242. The positioning pin III 1234 on the rocker arm II 123 can be installed in the elongated hole 1245 of the other support leg 1242. When the gear structure 1222 of the rocker arm I 122 meshes and rotates with the gear 1232 of the rocker arm II 123, the positioning pin II 1226 on the rocker arm I 122 and the positioning pin III 1234 on the rocker arm II 123 can reciprocate left and right in the corresponding elongated hole 1245 of the support leg 1242. At the same time, the support leg 1242 drives the hook body 1241 to reciprocate up and down.

[0063] When assembling the clamping assembly 12, first assemble rocker arm I 122 and rocker arm II 123 onto the corresponding positioning posts on the base shell 112 (e.g., Figure 6 The positioning pin 1121 shown is engaged with the positioning pin; the support leg 1242 of the hook 124 is then assembled onto the positioning pin II 1226 of the rocker arm I 122 and the positioning pin III 1234 of the rocker arm II 123, and the other end of the elastic element 1243 fixed on the hook body 1241 of the hook 124 is fixed onto the fixing shaft 1122 of the bottom shell 112. The elongated holes 1213 of the two cantilever 121 are then assembled onto the positioning pin I 1224 of the rocker arm I 122.

[0064] Please combine Figure 4 , Figure 5 and Figure 6As shown, the support leg 1242 of the hook 124 is a strip-shaped structure. The thickness of the support leg 1242 is equivalent to the height of the positioning post II 1226 and the positioning post III 1234. When the elongated hole 1245 of the support leg 1242 is assembled onto the positioning post II 1226 of the corresponding rocker arm I 122 and the positioning post III 1234 of the rocker arm II 123, the support leg 1242 of the hook is flush with the top of the rocker arm I 122 and the rocker arm II 123. Since the positioning post I 1224 of the rocker arm I 122 is formed by the horizontal extension of the top of both ends of the gear structure 1222 of the rocker arm I 1223, the cantilever 121 can be assembled onto the positioning post I 1224 of the rocker arm I 1223 of the rocker arm I 122 and is located above the support leg 1242 of the hook 124.

[0065] When no items are placed on the bracket 10, it is in an extended open state under the elastic force provided by the elastic element 1243. The two cantilever arms 121 extend to the left and right, while the hook 124 is in an elastically reset state. The cantilever arms 121 are in a left and right open state to facilitate the placement of items. When items with their own weight, such as electronic products or other items, are placed on the hook 124 of the bracket, the weight of the product overcomes the elastic force of the elastic element, causing the hook 124 to move downward. At the same time, the support leg 1242 on the hook 124 drives the rocker arm I 122 to rotate clockwise and the rocker arm II 123 to rotate counterclockwise. The rocker arm I 122 and the rocker arm II 123 mesh and rotate, causing the positioning pin I 1224 to rotate clockwise around the positioning hole I 1221. The two cantilever arms 121 assembled with the positioning pin I 1224 move closer to each other, and the clamping part 1211 clamps the item placed on the hook 124, realizing the function of gravity self-locking. When the item placed on the hook 124 is removed, the bracket 10 will return to its original open state under the elastic force of the elastic element 1243.

[0066] The locking assembly 13 includes a snap-fit ​​131 and a button 132.

[0067] like Figure 7 As shown, the buckle 131 has a positioning hole III 1311 and extends from the side of the positioning hole III 1311 to form an engaging portion 1312. The engaging portion 1312 can engage with the teeth on the gear 1232 of the rocker arm II 123. Specifically, the engaging portion 1312 engages near the meshing area between the gear structure 1222 of the rocker arm I 122 and the gear 1232 of the rocker arm II 123.

[0068] A groove 1313 is provided at the end away from the engaging part 1312, and the inclined surface of the groove 1313 is inclined outward. A blind hole I 1314 is provided at a position close to the engaging part 1312, which is between the engaging part 1312 and the groove 1313 and is offset from the central axis of the positioning hole III 1311. A spring I 1315 is provided in the blind hole I 1314.

[0069] like Figure 8 and Figure 9 As shown, button 132 has button 1321 and two support legs 1322 extending parallel from the end of button. Pivot II 1323 is constructed on the inner side of the support legs 1322 facing each other. On the outer side of one of the support legs, that is, on the side opposite to pivot II 1323, adjacent convex shaft I 1324 and convex shaft II 1325 are constructed. A downward blind hole II 1326 is constructed between the support legs 1322 near the end of button 1321. Spring II 1327 is installed in the blind hole II 1326.

[0070] See Figure 10 The bottom shell 112 has a fixing seat 1123 and a pivot I 1124. The fixing seat 1123 has a hole for mounting with the pivot II 1323 of the support leg 1322 of the button 132, so that the button 132 can rotate at a certain angle with the pivot II 1323 as the center. The pivot I 1124 is mounted with the buckle 131.

[0071] See also Figure 10 The latch 131 and the button 132 are assembled together onto the base shell 112. The positioning hole Ⅲ 1311 of the latch 131 is assembled onto the pivot I 1124 of the base shell 112. At this time, the engaging part 1312 of the latch 131 can engage with the gear 1232 of the rocker arm II 123. A baffle 1125 is provided near the pivot I 1124 on the base shell 112 and outside the engaging part 1312 of the latch 131 to ensure that when the engaging part 1312 engages with the gear 1232 of the rocker arm II 123, the rocker arm II 123 cannot rotate clockwise, that is, to prevent the cantilever 121 from extending and to keep the cantilever in a locked state.

[0072] The other end of the spring I 1315 inside the blind hole I 1314 of the snap fastener 131 abuts against the convex shaft I 1324 on the outside of the support leg 1322 of the button 132. The inclined groove 1314 of the snap fastener 131 is assembled with the convex shaft II 1325 on the outside of the support leg 1322 of the button 132. The other end of the spring II 1327 inside the blind hole II 13326 of the button 132 abuts against the bottom shell 112. Spring II 1327 exerts an elastic force on button 132, causing button 1321 of button 132 to extend outward into the through hole 1111 of the upper cover 111 of housing 11. At this time, the convex shaft II 1325 on the support leg 1322 of button 132 is located at the top of the snap-fit ​​groove 1314 and interacts with the inclined surface of the groove 1314, generating a thrust. The snap-fit ​​131 shifts clockwise around the positioning hole III 1311, causing the engaging part 1312 of snap-fit ​​131 to disengage from the gear part 1232 of rocker arm II 123, allowing cantilever 121 to extend and retract freely. When an object is placed on the gravity self-locking bracket 10 and button 132 is pressed, the convex shaft II 1325 on the support leg 1322 of button 132 moves downward, as... Figure 11 At the position of the dotted circle, the thrust generated by the convex shaft II 1325 on the inclined surface of the inclined groove 1314 disappears. Under the action of the elastic force of the spring I 1315, the buckle 131 shifts counterclockwise with the positioning hole III 1311 as the center, so that the engaging part 1312 of the buckle 131 engages with the gear part 1232 of the rocker arm II 123, thereby locking the cantilever 121.

[0073] The clamping and locking components in the above embodiments enable the bracket to be fixed by the weight of the item itself and then locked, ensuring its stable clamping and preventing it from falling off even when shaken. For example, all car phone gravity brackets on the market do not have a locking function. When the car passes over bumpy roads, the phone may slip off the bracket and fall off due to the violent shaking of the car body. With the addition of the locking function, this problem will no longer exist.

Claims

1. A gravity-locking bracket (10), comprising a housing (11), a clamping assembly (12), and a locking assembly (13), wherein the housing (11) limits and fixes the clamping assembly (12) and the locking assembly (13); characterized in that: The housing (11) includes an upper cover (111) and a bottom shell (112), the upper cover (111) and the bottom shell (112) forming a space for accommodating the clamping assembly (12) and the locking assembly (13); The clamping assembly (12) includes two cantilever arms (121), rocker arm I (122), rocker arm II (123), and hook (124). One end of the cantilever (121) is bent into a clamping part (1211), and the other end has a notch (1212) on its side. A cantilever elongated hole is constructed on the side of the notch (1212). The long axis of the cantilever elongated hole is parallel to the short side of the cantilever. The two cantilever (121) are arranged in opposite directions, and the two clamping parts (1211) face the same side. The rocker arm I (122) is a semi-circular gear structure (1222) with a positioning hole I (1221), and rocker arm I (1223) is formed by horizontally extending from both ends of the gear structure (1222). The end of the rocker arm I (1223) is provided with a positioning post I (1224) that can be assembled with the cantilever elongated hole. A rocker arm II (1225) is constructed between the two rocker arms I (1223) facing away from the gear structure (1222), and the end of the rocker arm II (1225) is provided with a positioning post II (1226). The rocker arm II (123) is a gear (1232) with a positioning hole II (1231). The rocker arm III (1233) extends out from the side of the gear (1232). The end of the rocker arm III (1233) is constructed with a positioning post III (1234). The rocker arm II (123) is meshed with the rocker arm I (122). The hook (124) includes a hook body (1241) and two parallel legs (1242) extending from one end of the hook body (1241). The legs (1242) have a long hole at the end away from the hook body (1241). The long axis of the long hole is parallel to the short side of the leg. The two long holes are respectively assembled with the positioning post II (1226) and the positioning post III (1234). An elastic element (1243) is provided on the hook body (1241). The other end of the elastic element (1243) is fixed on the bottom shell (112). The hook (124) is assembled below the cantilever (121).

2. The gravity self-locking support (10) according to claim 1, characterized in that, The cantilever (121) is a strip-shaped structure.

3. The gravity self-locking bracket (10) according to claim 1, characterized in that, The notch (1212) of one of the two cantilever arms (121) abuts against the side of the notch (1212) of the other cantilever arm (121).

4. The gravity self-locking bracket (10) according to claim 1, characterized in that, The top of rocker arm II (1225) is lower than the top of rocker arm I (1223), and the top of positioning post II (1226) is lower than the top of rocker arm I (1223); the top of rocker arm III (1233) is lower than the top of gear (1232), and the top of positioning post III (1234) is lower than the top of gear (1232); the gear structure (1222) has the same tooth profile parameters as the gear (1232) and has the same height.

5. The gravity self-locking bracket (10) according to claim 1, characterized in that, The support leg (1242) is a strip-shaped sheet structure.

6. The gravity self-locking bracket (10) according to any one of claims 1-5, characterized in that, The locking assembly (13) includes a buckle (131) and a button (132); The buckle (131) has a positioning hole III (1311) and a locking part (1312) extending from the side of the positioning hole III (1311). The locking part (1312) can engage with the gear (1232). The buckle (131) has an inclined groove (1313) with an outward inclined surface at one end away from the locking part (1312). A blind hole I (1314) for accommodating a spring I (1315) is opened at a position away from the central axis of the positioning hole III (1311) and close to the locking part (1312). The button (132) has a button (1321) and two support legs (1322) extending parallel to the end of the button (1321). Pivots II (1323) are constructed on the inward side of the two support legs (1322), and convex shafts I (1324) and convex shaft II (1325) are constructed on the outer side of one of the support legs (1322). A downward blind hole II (1326) for accommodating a spring II (1327) is constructed between the support legs (1322) near the end of the button (1321). The buckle (131) is assembled with the button (132), the spring I (1315) abuts against the convex shaft I (1324), and the inclined groove (1313) matches the convex shaft II (1325).

Images