A foldable earphone charging compartment

Abstract

The utility model discloses a foldable earphone charging bin, which relates to the field of earphone technology, including an earphone charging bin body, a bin cover, a hinge, and a convenient cleaning component for portability, limiting the position of Bluetooth earphones, and cleaning the interior of the earphone charging bin body after disassembly. In the utility model, two Bluetooth earphones are placed upright or inverted in a positive T-shaped groove and an inverted T-shaped groove respectively, which solves the problem that the two Bluetooth earphones in the existing earphone charging bin body are both placed upright or inverted therein, and the earphone charging bin body is large and inconvenient to carry. Moreover, a person pinches the position where the positive T-shaped groove and the inverted T-shaped groove on the special-shaped frame are close to each other, so as to facilitate the special-shaped frame to be away from the special-shaped groove, and then facilitate the cleaning of the inner wall of the earphone charging bin body and the special-shaped frame. By setting the feedforward microphone groove and the feedforward microphone groove, it is convenient to store the feedforward microphone and the feedback microphone of the Bluetooth earphone, and improves the fixing effect of the Bluetooth earphone.

Description

Technical Field

[0001] The utility model belongs to the technical field of earphones, and specifically relates to a foldable earphone charging compartment. Background Art

[0002] A Bluetooth headset is a headset that applies Bluetooth technology to headphones, allowing users to avoid the entanglement of annoying wires and is equipped with a headset charging compartment. However, when charging existing Bluetooth headsets, the Bluetooth headset can be charged by inserting the Bluetooth headset into the charging slot in the charging compartment. However, the headphone jack of the Bluetooth headset charging compartment is matched with the Bluetooth headset, has a small diameter and a deep depth, and the dust inside is not cleaned regularly, which will affect the charging of the Bluetooth headset after a long time.

[0003] A Chinese patent with patent number CN201920420312.6 discloses an earphone charging case, comprising a first shell, a cover body and a sliding assembly. The first shell is formed with an opening and a second shell embedded in the first shell for accommodating the earphone. The cover body is slidably connected to the second shell and covers the opening. The sliding assembly is attached between the cover body and the charging case and is used to slide the cover body to open or close the opening. The assembly is efficient and the process is simple. The user can operate it simply with one hand and the push is smooth, and the opening and closing feel is excellent.

[0004] However, in the implementation of relevant technologies, it was found that the above-designed earphone charging case has the following problems: when charging, the Bluetooth earphones can be charged by inserting them into the charging slot in the charging case, but the earphone jack of the Bluetooth earphone charging case is matched with the Bluetooth earphones, and its diameter is small and the depth is deep. The dust inside is not cleaned regularly, which will affect the charging of the Bluetooth earphones after a long time. In addition, the two Bluetooth earphones are placed upright or inverted therein, and the earphone charging case is large and inconvenient to carry. In view of this, a foldable earphone charging case is provided to overcome the above-mentioned defects.

[0005] In view of this, this application is hereby filed. Utility Model Content

[0006] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a foldable earphone charging bin, so as to solve the problem that the two Bluetooth earphones in the existing earphone charging bin are both placed upright or inverted therein, and the earphone charging bin is large in size and inconvenient to carry and difficult to clean the dust inside.

[0007] In order to solve the above technical problems, the utility model provides a foldable earphone charging bin, comprising an earphone charging bin body, a bin cover, a hinge, and a convenient cleaning component for portability, limiting the position of Bluetooth earphones, and cleaning the interior of the earphone charging bin body after disassembly, the convenient cleaning component comprising a special-shaped groove, a feedforward microphone groove, and a first feedback microphone groove opened on the front side of the earphone charging bin body, the adjacent feedforward microphone grooves and the first feedback microphone grooves are connected, the inner wall of the special-shaped groove is fitted with a special-shaped frame, and the front side of the special-shaped frame is penetrated by a positive T-shaped groove and an inverted T-shaped groove that are close to each other and not connected.

[0008] Furthermore, a slot is provided on the front side of the special-shaped frame, a positioning slot is provided on the inner wall of the special-shaped slot close to the slot, an elastic block is tightly attached between the slot and the positioning slot, and anti-slip particles are integrally formed on the outer surface of the elastic block.

[0009] Furthermore, a first elastic reinforcement block is installed on the outer top wall of the special-shaped frame, and a second elastic reinforcement block is installed on the outer right side wall of the special-shaped frame. Both the first elastic reinforcement block and the second elastic reinforcement block are tightly attached to the inner wall of the special-shaped groove.

[0010] Furthermore, the inner walls of the positive T-shaped groove and the inverted T-shaped groove are integrally formed with a plurality of first arc-shaped grooves, and the inner walls of the positive T-shaped groove and the inverted T-shaped groove are also integrally formed with a second arc-shaped groove, and the second arc-shaped groove is adapted to the call microphone of the Bluetooth headset.

[0011] Furthermore, a placement groove is provided through the front side of the special-shaped frame, and the material of the special-shaped frame is carbon fiber.

[0012] Furthermore, a card slot is integrally formed on the compartment cover, and a second feedback microphone slot and a third feedback microphone slot are provided on the inner wall of the card slot. Two call microphone slots are also provided on the inner wall of the card slot, and the two call microphone slots are respectively connected to the second feedback microphone slot and the third feedback microphone slot.

[0013] Furthermore, the inner walls of the positive T-shaped groove and the inverted T-shaped groove are integrally formed with multiple first arc chamfers, the four corners of the earphone charging compartment body are integrally formed with second arc chamfers, the first permanent magnet and the second permanent magnet are respectively installed on the opposite sides of the compartment cover and the earphone charging compartment body, and the outer wall of the compartment cover is provided with a groove.

[0014] Furthermore, the front side of the earphone charging case body is integrally formed with control buttons and a power indicator light, and the inner wall of the special-shaped groove is integrally formed with two groups of charging contacts, and the two groups of charging contacts are respectively located in the positive T-shaped groove and the inverted T-shaped groove.

[0015] After adopting the above technical scheme, the utility model has the following beneficial effects compared with the prior art.

[0016] 1. In the utility model, two Bluetooth headsets are placed upright or inverted in the positive T-shaped groove and the inverted T-shaped groove respectively, which solves the problem that the two Bluetooth headsets in the existing headset charging bin body are both placed upright or inverted therein, which makes the headset charging bin body large and inconvenient to carry. Moreover, a person pinches the position where the positive T-shaped groove and the inverted T-shaped groove on the special-shaped frame are close to each other, so that the special-shaped frame is conveniently moved away from the special-shaped groove, and then it is convenient to clean the inner wall of the headset charging bin body and the special-shaped frame. By arranging the feedforward microphone groove and the feedforward microphone groove, the feedforward microphone and the feedback microphone of the Bluetooth headset are conveniently stored, thereby improving the fixing effect of the Bluetooth headset, avoiding the problem of shaking and damage in the headset charging bin body, and thus extending the service life of the Bluetooth headset.

[0017] 2. In the utility model, the elasticity of the elastic card block is utilized and it is clamped between the slot and the positioning slot, thereby increasing the friction between the outer wall of the special-shaped frame and the inner wall of the special-shaped slot. By setting the first elastic reinforcement block and the second elastic reinforcement block, the friction between the outer wall of the special-shaped frame and the inner wall of the special-shaped slot is further increased, ensuring that the special-shaped frame is more stable in the special-shaped slot, avoiding the special-shaped frame from being separated from the special-shaped slot without human power, and manually picking out the elastic card block between the slot and the positioning slot, thereby facilitating manual removal of the special-shaped frame from the special-shaped slot for subsequent cleaning of the special-shaped slot and the special-shaped frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation on the present invention. Obviously, the accompanying drawings described below are only some embodiments. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work. In the accompanying drawings:

[0019] Figure 1 This is a schematic diagram of the overall structure of a foldable earphone charging compartment of the utility model;

[0020] Figure 2 This is a schematic diagram of the structure of a special-shaped frame in a foldable earphone charging compartment of the utility model;

[0021] Figure 3 for Figure 1 A magnified view of the structure at center A;

[0022] Figure 4 for Figure 1 A magnified view of the structure at point B.

[0023] Numbers in the figure:

[0024] 1. Headphone charging compartment body; 2. Compartment cover; 3. Hinge;

[0025] 4. Convenient cleaning assembly; 401. Special-shaped slot; 402. Special-shaped frame; 403. Positive T-shaped slot; 404. Inverted T-shaped slot; 405. Feedforward microphone slot; 406. First feedback microphone slot;

[0026] 5. Slot; 6. Positioning slot; 7. Elastic card block; 8. First elastic reinforcement block; 9. Second elastic reinforcement block; 10. First arc-shaped groove; 11. Second arc-shaped groove; 12. First arc-shaped chamfer; 13. Placement slot; 14. Card slot; 15. Second feed-back microphone slot; 16. Third feed-back microphone slot; 17. Call microphone slot; 18. Control button; 19. Battery indicator light; 20. Charging contact; 21. First permanent magnet; 22. Second permanent magnet; 23. Groove; 24. Second arc-shaped chamfer.

[0027] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.

[0029] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] An existing earphone charging case has the following problems: when charging, the Bluetooth earphone can be charged by inserting it into the charging slot in the charging case, but the earphone jack of the Bluetooth earphone charging case is matched with the Bluetooth earphone, and its diameter is small and the depth is deep. The dust inside is not cleaned regularly, which will affect the charging work of the Bluetooth earphone after a long time. In addition, the two Bluetooth earphones are placed upright or upside down therein, and the earphone charging case is large in size and inconvenient to carry.

[0032] Embodiment 1

[0033] Depend on Figure 1-Figure 4 The utility model provides a foldable earphone charging compartment.

[0034] Specifically, by Figure 1-Figure 4 Provided, including an earphone charging compartment body 1, a compartment cover 2, a hinge 3 and a convenient cleaning component 4 for portability, limiting the position of the Bluetooth earphone and cleaning the interior of the earphone charging compartment body 1 after disassembly, the hinge 3 is installed between the earphone charging compartment body 1 and the compartment cover 2, the compartment cover 2 is hinged to the earphone charging compartment body 1 through the hinge 3, and then the compartment cover 2 is folded on the earphone charging compartment body 1, the convenient cleaning component 4 includes a special-shaped groove 401, a feedforward microphone groove 405 and a first feedback microphone groove 406 opened on the front side of the earphone charging compartment body 1, the adjacent feedforward microphone groove 405 and the first feedback microphone groove 406 are connected, the inner wall of the special-shaped groove 401 is attached with a special-shaped frame 402, and the front side of the special-shaped frame 402 is penetrated with a positive T-shaped groove 403 and an inverted T-shaped groove 404 that are close to each other and not connected;

[0035] The inner walls of the positive T-shaped groove 403 and the inverted T-shaped groove 404 are integrally formed with a plurality of first arc-shaped grooves 10. The inner walls of the positive T-shaped groove 403 and the inverted T-shaped groove 404 are also integrally formed with a second arc-shaped groove 11. The second arc-shaped groove 11 is adapted to the call microphone of the Bluetooth headset. By providing the first arc-shaped groove 10 and the second arc-shaped groove 11, it is not only convenient to clean the special-shaped frame 402, and avoid the problem that the corners of the special-shaped frame 402 are easy to scratch the user, but also improves the aesthetics and avoids scratches on the outer surface of the Bluetooth headset.A placement groove 13 is provided on the front side of the special-shaped frame 402. The material of the special-shaped frame 402 is carbon fiber. By providing the placement groove 13, it is convenient to put the cotton cloth used to clean the special-shaped groove 401 and the Bluetooth headset into the special-shaped frame 402 for subsequent cleaning operations. Carbon fiber has a series of excellent properties that cannot be replaced by other materials, such as light weight, high strength, high temperature resistance, corrosion resistance, erosion and sputtering resistance, good designability, and compositeness. It can also improve the structural design freedom of the finished product and improve the shock resistance of the product, thereby extending the service life of the special-shaped frame 402. At the same time, it is light in weight and easy to carry. A card slot 14 is integrally formed on the compartment cover 2. The inner wall of the card slot 14 is provided with a second feedback microphone slot 15 and a third feedback microphone slot 16. The card slot 1 The inner wall of the card slot 14 is also provided with two call microphone grooves 17, and the two call microphone grooves 17 are respectively connected to the second feed-back microphone groove 15 and the third feed-back microphone groove 16. By providing the second feed-back microphone groove 15, the third feed-back microphone groove 16 and the call microphone groove 17 in the card slot 14, the fixing effect of the feed-back microphone and the call microphone of the Bluetooth headset is improved. The inner walls of the positive T-shaped groove 403 and the inverted T-shaped groove 404 are integrally formed with a plurality of first arc chamfers 12, and the four corners of the earphone charging compartment body 1 are integrally formed with second arc chamfers 24. The first permanent magnet 21 and the second permanent magnet 22 are respectively installed on the opposite sides of the compartment cover 2 and the earphone charging compartment body 1. The outer wall of the compartment cover 2 is provided with a groove 23. By setting the first arc chamfer 1 2, it is not only convenient to clean the special-shaped frame 402, and avoid the problem that the corners of the special-shaped frame 402 are easy to scratch the user, but also improves the aesthetics, and again avoids scratches on the outer surface of the Bluetooth headset. By setting the second arc chamfer 24, the problem that the corners of the headset charging compartment body 1 are easy to scratch the user is avoided, and the aesthetics of the headset charging compartment body 1 is increased. By setting and utilizing the magnetism of the first permanent magnet 21 and the second permanent magnet 22, after the headset charging compartment body 1 and the compartment cover 2 are fitted, the first permanent magnet 21 and the second permanent magnet 22 are magnetically attracted to each other, so as to fix the compartment cover 2 on the headset charging compartment body 1, and avoid the problem that the compartment cover 2 is away from the headset charging compartment body 1 without human power, thereby avoiding the Bluetooth headset in the headset charging compartment body 1 and the compartment cover 2 from accidentally being moved. The problem of falling outside is solved, so it is ensured that the Bluetooth headset is not easy to fall and be damaged, and the service life of the Bluetooth headset is extended. By setting the groove 23, it is convenient for the thumb to pop open the compartment cover 2 with one hand, so as to take and put the Bluetooth headset in the headset charging compartment body 1. The front side of the headset charging compartment body 1 is integrally formed with a control button 18 and a power indicator light 19, and the inner wall of the special-shaped groove 401 is integrally formed with two groups of charging contacts 20, which are respectively located in the positive T-shaped groove 403 and the inverted T-shaped groove 404. The control button 18 is used for pairing and connecting the Bluetooth headset, and the power indicator light 19 flashing different colors is used to indicate whether the Bluetooth headset in the headset charging compartment body 1 is fully charged and whether the headset charging compartment body 1 is fully charged. The two groups of charging contacts 20 are used to charge two Bluetooth headsets;The two Bluetooth headsets are placed upright or inverted in the positive T-shaped groove 403 and the inverted T-shaped groove 404 respectively, which solves the problem that the two Bluetooth headsets in the existing headset charging compartment body 1 are both placed upright or inverted therein, and the headset charging compartment body 1 is large and inconvenient to carry. The position where the positive T-shaped groove 403 and the inverted T-shaped groove 404 on the special-shaped frame 402 are close to each other is pinched by hand, so that the special-shaped frame 402 is conveniently moved away from the special-shaped groove 401, and then it is convenient to clean the inner wall of the headset charging compartment body 1 and the special-shaped frame 402. By setting the feedforward microphone groove 405 and the feedforward microphone groove 405, it is convenient to store the feedforward microphone and the feedback microphone of the Bluetooth headset, improve the fixing effect of the Bluetooth headset, avoid the problem of shaking and damage in the headset charging compartment body 1, and thus extend the service life of the Bluetooth headset. ;

[0036] Embodiment 2

[0037] Furthermore, as a specific implementation of the present invention, the present invention provides a foldable earphone charging compartment.

[0038] Based on the first embodiment, specifically, Figure 1-Figure 3 It is shown that a slot 5 is provided on the front side of the special-shaped frame 402, a positioning slot 6 is provided on the inner wall of the special-shaped slot 401 close to the slot 5, an elastic block 7 is closely attached between the slot 5 and the positioning slot 6, and the outer surface of the elastic block 7 is integrally formed with anti-slip particles;

[0039] The outer top wall of the special-shaped frame 402 is installed with a first elastic reinforcement block 8, and the outer right side wall of the special-shaped frame 402 is installed with a second elastic reinforcement block 9. The first elastic reinforcement block 8 and the second elastic reinforcement block 9 are both in close contact with the inner wall of the special-shaped groove 401. By utilizing the elasticity of the elastic clamping block 7 and clamping it between the slot 5 and the positioning slot 6, the friction between the outer wall of the special-shaped frame 402 and the inner wall of the special-shaped groove 401 is increased. By providing the first elastic reinforcement block 8 and the second elastic reinforcement block 9, the friction between the outer wall of the special-shaped frame 402 and the inner wall of the special-shaped groove 401 is increased again, ensuring that the special-shaped frame 402 is more stable in the special-shaped groove 401, avoiding the special-shaped frame 402 from detaching from the special-shaped groove 401 without human power, and manually picking out the elastic clamping block 7 between the slot 5 and the positioning slot 6, it is convenient for manpower to remove the special-shaped frame 402 from the special-shaped groove 401, so as to subsequently clean the special-shaped groove 401 and the special-shaped frame 402.

[0040] Working principle:

[0041] The two Bluetooth headsets are placed upright and inverted in the positive T-shaped groove 403 and the inverted T-shaped groove 404 respectively, which solves the problem that the two Bluetooth headsets in the existing earphone charging case body 1 are both placed upright or inverted therein, which makes the earphone charging case body 1 large and inconvenient to carry. Moreover, by pinching the positive T-shaped groove 403 and the inverted T-shaped groove 404 on the special-shaped frame 402 where they are close to each other, it is convenient to move the special-shaped frame 402 away from the special-shaped groove 401, and then it is convenient to clean the inner wall of the earphone charging case body 1 and the special-shaped frame 402. By setting the feedforward microphone groove 405 and the feedforward microphone groove 405, it is convenient to store the feedforward microphone and the feedback microphone of the Bluetooth headset, thereby improving the fixing effect of the Bluetooth headset and avoiding the problem of shaking and damage in the earphone charging case body 1, thereby extending the service life of the Bluetooth headset.

[0042] By providing the groove 23 , it is convenient to open the compartment cover 2 with the thumb of one hand so as to take out and put in the Bluetooth headset in the headset charging compartment body 1 .

[0043] By utilizing the elasticity of the elastic card block 7 and clamping it between the slot 5 and the positioning slot 6, the friction between the outer wall of the special-shaped frame 402 and the inner wall of the special-shaped slot 401 is increased. By providing the first elastic reinforcement block 8 and the second elastic reinforcement block 9, the friction between the outer wall of the special-shaped frame 402 and the inner wall of the special-shaped slot 401 is further increased, ensuring that the special-shaped frame 402 is more stable in the special-shaped slot 401, avoiding the special-shaped frame 402 from escaping from the special-shaped slot 401 without human power, and manually picking out the elastic card block 7 between the slot 5 and the positioning slot 6, thereby facilitating manual removal of the special-shaped frame 402 from the special-shaped slot 401, so as to facilitate subsequent cleaning of the special-shaped slot 401 and the special-shaped frame 402.

[0044] The above is only a preferred embodiment of the present invention, and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation schemes in the above embodiments can also be further combined or replaced. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the present invention.

Claims

1. A foldable earphone charging case, comprising: Headphone charging case body (1); Bin cover (2); Hinge (3); A convenient cleaning component (4) for portability, limiting the position of a Bluetooth headset, and cleaning the interior of a headset charging compartment body (1) after disassembly; It is characterized in that the convenient cleaning component (4) includes a special-shaped groove (401), a feed-forward microphone groove (405) and a first feed-back microphone groove (406) opened on the front side of the earphone charging compartment body (1), the adjacent feed-forward microphone groove (405) and the first feed-back microphone groove (406) are connected, the inner wall of the special-shaped groove (401) is fitted with a special-shaped frame (402), and the front side of the special-shaped frame (402) is penetrated by a positive T-shaped groove (403) and an inverted T-shaped groove (404) that are close to each other and not connected.

2. The foldable earphone charging compartment according to claim 1, characterized in that: A slot (5) is provided on the front side of the special-shaped frame (402); a positioning slot (6) is provided on the inner wall of the special-shaped slot (401) close to the slot (5); an elastic card block (7) is tightly attached between the slot (5) and the positioning slot (6); and anti-slip particles are integrally formed on the outer surface of the elastic card block (7).

3. The foldable earphone charging compartment according to claim 2, characterized in that: A first elastic reinforcement block (8) is installed on the outer top wall of the special-shaped frame (402), and a second elastic reinforcement block (9) is installed on the outer right side wall of the special-shaped frame (402), and both the first elastic reinforcement block (8) and the second elastic reinforcement block (9) are tightly attached to the inner wall of the special-shaped groove (401).

4. The foldable earphone charging compartment according to claim 3, characterized in that: The inner walls of the positive T-shaped groove (403) and the inverted T-shaped groove (404) are integrally formed with a plurality of first arc-shaped grooves (10), and the inner walls of the positive T-shaped groove (403) and the inverted T-shaped groove (404) are also integrally formed with a second arc-shaped groove (11), and the second arc-shaped groove (11) is adapted to the call microphone of the Bluetooth headset.

5. The foldable earphone charging compartment according to claim 4, characterized in that: A placement groove (13) is provided through the front side of the special-shaped frame (402), and the material of the special-shaped frame (402) is carbon fiber.

6. The foldable earphone charging compartment according to claim 5, characterized in that: The compartment cover (2) is integrally formed with a card slot (14), the inner wall of the card slot (14) is provided with a second feed-back microphone slot (15) and a third feed-back microphone slot (16), the inner wall of the card slot (14) is also provided with two communication microphone slots (17), and the two communication microphone slots (17) are respectively connected to the second feed-back microphone slot (15) and the third feed-back microphone slot (16).

7. The foldable earphone charging compartment according to claim 6, characterized in that: The inner walls of the positive T-shaped groove (403) and the inverted T-shaped groove (404) are integrally formed with a plurality of first arc chamfers (12); the four corners of the earphone charging compartment body (1) are integrally formed with second arc chamfers (24); the first permanent magnet (21) and the second permanent magnet (22) are respectively installed on the opposite sides of the compartment cover (2) and the earphone charging compartment body (1); and the outer wall of the compartment cover (2) is provided with a groove (23).

8. The foldable earphone charging compartment according to claim 7, characterized in that: The front side of the earphone charging case body (1) is integrally formed with a control button (18) and a power indicator light (19), and the inner wall of the special-shaped groove (401) is integrally formed with two groups of charging contacts (20), and the two groups of charging contacts (20) are respectively located in the positive T-shaped groove (403) and the inverted T-shaped groove (404).

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