Kitchen and bath fast-assembly locking structure applied to multiple scenes

Abstract

The utility model provides a kitchen and bath fast-assembly locking structure applied to multiple scenes. The kitchen and bath fast-assembly locking structure comprises a bolt, a nut sleeve and a clamping piece. The upper end of the nut sleeve is provided with an enclasping part capable of deflecting and deforming, the inner side threads are matched with the bolt, and the outer side inclined guide face is matched with the conical matching face of the clamping piece. According to the utility model, the deformable first stop structure is matched with the second stop structure below the enclasping part, so that a reasonable gap is kept between the clamping piece and the nut sleeve in the pushing-in process, and the sliding resistance caused by advanced contact is avoided; the quick-mounting locking structure effectively solves the clamping stagnation problem of an existing quick-mounting locking structure in the mounting process, improves the construction efficiency, enhances the locking stability and is suitable for various mounting scenes.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of quick lock structure, especially a kitchen and bathroom quick installation locking structure of multi-scene application. BACKGROUND

[0002] The quick lock structure is widely used in the kitchen and bathroom field, especially in the installation and fixation of toilet cover and toilet body, water tank and other components. Its advantage lies in that it can quickly complete the locking operation in limited installation space, improve the installation efficiency and enhance the structural stability.

[0003] The existing quick lock structure is usually composed of the following key components:

[0004] 1. Bolt: the surface is provided with external threads for passing through the installation hole and providing locking support.

[0005] 2. Nut sleeve: slidably arranged on the screw rod and locked to the final position through threads.

[0006] 3. Clamping piece: cooperates with the nut sleeve to apply clamping force during locking to make the nut sleeve firmly hold the bolt.

[0007] The inside of the nut sleeve is axially through, forming a through slot for sliding cooperation with the bolt. The upper end is formed with a plurality of holding parts around the through slot through slotting, the inner side of the holding part is provided with internal threads matched with the external threads of the screw rod, and the outer side is provided with an inclined guide surface. The inner side of the clamping piece is formed with a tapered matching surface matched with the guide surface of the nut sleeve. When the two are in contact and are pressed, the holding part is contracted to the center position of the through slot under the action of the tapered matching surface, so that the internal threads are more closely matched with the external threads of the screw rod. Then, further rotation of the nut sleeve or the bolt can be realized.

[0008] However, in actual application, the existing quick lock structure has the following problems:

[0009] Because the tapered matching surface of the clamping piece is matched with the guide surface of the nut sleeve under the action of gravity, it is easy to apply a weak extrusion force to the nut sleeve, which causes the holding part to shrink in the direction of the screw rod, so that the internal threads are in contact with the screw threads too early, thereby increasing the sliding resistance and affecting the smooth insertion of the nut sleeve, and even causing the jamming phenomenon.

[0010] In the narrow installation environment of the toilet base, water tank and other components, the construction personnel need to complete the insertion and locking of the nut sleeve in the limited operation space. If the quick lock structure is jammed during the insertion process, it not only affects the installation progress, but also greatly increases the construction difficulty and time cost.

[0011] Therefore, the present application has been specially designed by the inventor, and the case has been produced. CONTENT OF THE UTILITY MODEL

[0012] To solve the above problems, the technical scheme of the utility model is as follows:

[0013] A kitchen and bathroom quick installation locking structure of multi-scene application, including bolt with external thread, nut sleeve and clamping piece which are sequentially and slidingly sleeved on the bolt, the upper end of the nut sleeve is slotted to form a plurality of clamping portions which are distributed around the through slot and can be deflected and deformed, the inner side of the clamping portion forms an internal thread matched with the external thread, the outer side wall of the plurality of clamping portions forms an inclined guide surface, the clamping piece is internally provided with a matching groove for the clamping portion of the top of the nut sleeve to pass through, the top of the matching groove forms a tapered matching surface matched with the guide surface, the bottom of the matching groove is provided with a deformable first stop structure, the outer side wall of the plurality of clamping portions and located below the guide surface is provided with a second stop structure matched with the first stop structure, when the first stop structure is located below the lower end of the second stop structure, the guide surface and the matching surface have a gap.

[0014] Preferably, the first stop structure and the second stop structure are respectively a ring and a clamping point, and a plurality of clamping points are arranged at the same horizontal height.

[0015] Preferably, the bottom of the clamping piece is recessed inwardly and forms an annular deformation groove, and the design position of the ring is located within the coverage range of the deformation groove.

[0016] Preferably, the surface of the clamping point is arc-shaped, and the upper and lower sides thereof are arc-shaped and connected with the side wall of the clamping portion.

[0017] Preferably, the clamping portion includes a deformation section connected with the top of the nut sleeve and a connecting section arranged at the top of the deformation section, the inner side of a plurality of connecting sections forms a continuous internal thread matched with the external thread of the rod body, and the guide surface is arranged on the outer side of the connecting end.

[0018] Preferably, the clamping piece includes a base body and a buckle piece, the upper end of the base body forms a mounting groove matched with the buckle piece, the buckle piece is buckled and mounted in the mounting groove, and the matching surface is arranged on the inner bottom of the buckle piece.

[0019] Preferably, the side wall of the buckle piece forms an annular buckle groove around the circumferential side thereof, and the side wall of the mounting groove is provided with a plurality of clamping blocks in limiting cooperation with the buckle groove.

[0020] Preferably, the bottom edge of the buckle piece forms an inclined first guide corner surface.

[0021] Preferably, the bottom of the matching groove is provided with an inclined second guide corner surface.

[0022] Preferably, the nut sleeve is symmetrically provided with a sheet-shaped operation portion around the circumferential side.

[0023] The utility model discloses a fastening locking structure, which comprises a clamping piece and a nut sleeve.

[0024] 1. The cooperation of the deformable first stop structure and the second stop structure keeps a reasonable gap between the clamping piece and the nut sleeve during the pushing-in process, avoids the sliding resistance caused by early contact, and ensures smooth installation.

[0025] 2. The optimized design of the clamping part of the nut sleeve keeps a proper loose state during the pushing-in process, and then the guiding surface of the clamping piece applies pressure to realize quick and stable locking.

[0026] 3. The design of the sheet-shaped operation part improves the convenience of hand operation, making the rotary locking more relaxed and efficient.

[0027] 4. The design of the ring-distributed clamping part, combined with the conical matching surface, makes the clamping part bear force uniformly, improves the locking strength, and prevents loosening.

[0028] 5. The compact structure design is suitable for installation environments in narrow spaces such as toilets and water tanks, ensuring efficient assembly in limited space.

[0029] In summary, the utility model adopts the cooperation of the deformable first stop structure and the second stop structure to keep a reasonable gap between the clamping piece and the nut sleeve during the pushing-in process, avoid the sliding resistance caused by early contact, effectively solve the jamming problem of the existing fastening locking structure during installation, improve the construction efficiency, enhance the locking stability, and be suitable for various installation scenes. BRIEF DESCRIPTION OF DRAWINGS

[0030] The drawings described herein are used to provide a further understanding of the utility model and form a part of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an improper limitation on the utility model.

[0031] Among them:

[0032] Figure 1 is the three-dimensional structure schematic diagram of the utility model;

[0033] Figure 2 is the overall structure schematic diagram of the utility model;

[0034] Figure 3 is the cross-sectional structure schematic diagram of the utility model;

[0035] Figure 4 is the explosion structure schematic diagram of the utility model;

[0036] Figure 5 This is a three-dimensional structural diagram of the nut sleeve in this utility model;

[0037] Figure 6 This is one of the cross-sectional and exploded structural schematic diagrams of this utility model;

[0038] Figure 7 This is the second cross-sectional and exploded structural schematic diagram of this utility model.

[0039] Label Explanation:

[0040] 10. Bolt; 11. Rod; 12. Nut; 13. External thread; 20. Nut sleeve; 21. Through groove; 30. Clamping part; 31. Mating groove; 311. Conical area; 312. Limiting area; 313. Mating surface; 314. Moving area; 32. Snap ring; 33. Deformation groove; 34. Base; 341. Mounting groove; 342. Snap block; 35. Snap fastener; 351. Snap groove; 352. First chamfered surface; 36. Second chamfered surface; 40. Clamping part; 41. Deformation section; 42. Connecting section; 43. Internal thread; 44. Guide surface; 45. Locking point; 50. Operating part; 51. Base plate. Detailed Implementation

[0041] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer and more understandable, 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 only used to explain this utility model and are not intended to limit this utility model.

[0042] Please see Figures 1 to 7 This is a multi-scenario application quick-install locking structure for kitchens and bathrooms, which is the preferred embodiment of this utility model. It includes a bolt 10 with external threads 13, a nut sleeve 20 that is slidably sleeved on the bolt 10, and a clamping member 30, wherein:

[0043] like Figure 3 , 4 As shown, the bolt 10 consists of a shank 11 and a nut 12. The outer periphery of the shank 11 is provided with an external thread 13, and the top of the nut 12 is provided with a tool groove (not shown in the figure) for cooperating with tools such as screwdrivers to rotate the bolt 10.

[0044] like Figure 3 , 4As shown, the nut sleeve 20 is cylindrical in whole, and a through slot 21 is formed along the axial direction of the nut sleeve 20, the through slot 21 is cylindrical to match the rod body 11, and has a smooth inner wall for the rod body 11 to pass through smoothly. The top of the nut sleeve 20 is slotted downward along the outer sidewall, so that the top of the nut sleeve 20 forms several gripping portions 40 distributed around the through slot 21. Since the slot penetrates the outside and the inside of the through slot 21, the individual gripping portions 40 can be based on the inner and outer deflection of the bottom.

[0045] In combination Figure 3 , 4 , as shown in FIG. 5, the gripping portion 40 includes a deformation section 41 connected to the top of the nut sleeve 20 and a connecting section 42 provided at the top of the deformation section 41. The inner side of the several connecting sections 42 forms a continuous internal thread 43 that matches the external thread 13 of the rod body 11. Under normal circumstances, due to the existence of the slot, the upper end of the gripping portion 40 is deflected outward. When the nut sleeve 20 is inserted into the rod body 11, the internal thread 43 on the inner side of the gripping portion 40 is away from the external thread 13 of the rod body 11, so that the nut sleeve 20 can slide along the rod body 11 smoothly. When the gripping portion 40 is pressed to deform inward, the internal thread 43 on the inner side of the gripping portion 40 is engaged on the external thread 13 on the outer side of the rod body 11. At this time, the nut sleeve 20 is threadedly connected with the rod body 11, and further thread locking can be achieved by rotating.

[0046] As shown in Figure 4 , the slot has a total of 4 and is uniformly distributed around the top of the nut sleeve 20, so that the top of the nut sleeve 20 forms four evenly distributed gripping portions 40.

[0047] As shown in Figure 5 , 6 , the outer side of the connecting section 42 forms an inclined guide surface 44, and the guide surfaces 44 of the several connecting sections 42 form a tapered surface that is spaced around the through slot 21.

[0048] As shown in Figure 3 , 6 , 7, in order to match the guide surface 44 to press the gripping portion 40 to make it connect with the external thread 13 of the rod body 11 smoothly, the clamping piece 30 in this embodiment is cylindrical in whole, and a matching slot 31 that matches the gripping portion 40 is formed along the axial direction of the clamping piece 30. The matching slot 31 includes a tapered region 311 at the upper end that matches the several guide surfaces 44. The inner sidewall of the tapered region 311 constitutes a matching surface 313 that matches the inclined guide surface 44. The tapered region 311 further includes a limiting region 312 below for the several deformation sections 41 to pass through, and the limiting region 312 is cylindrical in whole.

[0049] As shown in Figure 3 , 6As shown, the bottom of the conical region 311 has a movable region 314 for the up-and-down movement of the connecting section 42, and when the connecting section 42 is located at the bottom of the movable region 314, the guiding surface 44 at the upper end of the connecting section 42 has a certain spacing with the matching surface 313, at this time, the clamping portion 40 will not be deformed, and thus the clamping member 30 and the nut sleeve 20 can smoothly slide along the rod body 11.

[0050] The bottom of the matching groove 31 is provided with a deformable first stop structure, and the outer side wall of each clamping portion 40 and below the guiding surface 44 is provided with a second stop structure for stop cooperation with the first stop structure, and when the first stop structure is located at the lower end of the second stop structure, the guiding surface 44 has a gap with the matching surface 313.

[0051] In this embodiment, the first stop structure and the second stop structure are respectively the ring 32 and the clamping point 45, and the clamping points 45 are arranged at the same horizontal height.

[0052] In order to maintain the above state, a ring-shaped ring 32 is arranged around the side wall in the limiting region 312, and the outer wall of the deformation section 41 is correspondingly provided with a plurality of clamping points 45, and the clamping points 45 are arranged at the same height position of the deformation section 41, in addition, the clamping point 45 is located at the lower end of the ring 32, and when the clamping point 45 contacts with the ring 32, the lower end of the connecting section 42 is in contact with the bottom of the movable region 314, at this time, the spacing state of the guiding surface 44 and the matching surface 313 can be maintained through the contact between the clamping point 45 and the lower end of the ring 32; when the clamping member 30 and the nut sleeve 20 are synchronously moved to the position close to the top of the rod body 11, at this time, the top of the clamping member 30 also contacts with the inner top of the mounting hole of the toilet seat, and cannot continue to be pushed upward, after the nut sleeve 20 is pushed upward again, the clamping point 45 is deformed with the ring 32, so that the clamping point 45 passes over the ring 32 upwardly and moves to the upper side of the ring 32, at this time, the guiding surface 44 can continue to move toward the direction close to the matching surface 313 until contacting with the matching surface 313, after the nut sleeve 20 is continuously moved upwardly, under the guiding action of the matching surface 313, the clamping portions 40 deform toward the central position of the rod body 11, so that the internal thread 43 in the clamping portion 40 is smoothly connected with the external thread 13 on the outer side of the rod body 11, thereby clamping the rod body 11, rotating the nut sleeve 20 or the nut 12, so that the nut sleeve 20 continues to move toward the direction of the nut 12, under the guiding action of the matching surface 313, the rod body 11 is further clamped, and finally the fast installation of the rod body 11 on the mounting hole of the toilet seat is realized.

[0053] In this embodiment, the clamping points 45 are respectively designed on the outer side of the deformation section 41 of the four clamping portions 40, and the outermost clamping point 45 contacts with the inner side wall of the limiting region 312, so that the nut sleeve 20 maintains a relatively stable posture with the clamping member 30 during the movement process, avoiding the inclination of the clamping member 30, which causes the guiding surface 44 to contact with the matching surface 313 in advance and causes the jamming phenomenon.

[0054] As shown in Figure 3 , 5 , the surface of the clamping point 45 is arc-shaped, and the upper and lower sides thereof are arc-shaped and connected with the side wall of the clamping portion 40, so that the cooperation process of the clamping point 45 and the clamping ring 32 is smoother.

[0055] In addition, as shown in Figure 3 , 6 , the bottom of the clamping piece 30 is recessed inward to form a ring-shaped deformation groove 33 distributed around the limiting area 312, and the designed position of the clamping ring 32 is located in the coverage range of the deformation groove 33, so that through the design of the deformation groove 33, when the clamping point 45 passes the clamping ring 32, the side wall of the limiting area 312 can be deformed outward as a whole, and the cooperation can realize the action process of the clamping point 45 passing the clamping ring 32. During this process, the clamping portion 40 itself can also swing and deform inward to achieve the purpose of the clamping point 45 passing the clamping ring 32. The cooperation of the two can make the process of the clamping point 45 passing the clamping ring 32 more smooth, and reduce the deformation amplitude of the clamping portion 40, avoiding the phenomenon of clamping stagnation caused by the deformation of the clamping portion 40 making the nut sleeve 20 clamping the rod body 11 in advance.

[0056] As shown in Figure 3 , 4 , 6, in the embodiment, the clamping piece 30 includes a base body 34 and a buckle piece 35, the buckle piece 35 is in a whole cylindrical shape, the upper end of the base body 34 forms a mounting groove 341 matched with the buckle piece 35, the side wall of the buckle piece 35 forms a ring-shaped buckle groove 351 around the circumferential side thereof, the side wall of the mounting groove 341 is provided with a plurality of clamping blocks 342 matched with the limiting of the buckle groove 351, and the cooperation surface 313 is designed on the inner bottom of the buckle piece 35.

[0057] In the embodiment, the clamping block 342 is designed to have three, and is uniformly distributed around the circumferential side of the mounting groove 341, and the bottom of the mounting groove 341 forms a stepped surface (not marked in the figure), the upper end of the stepped surface is in contact with the bottom of the buckle piece 35, and the stepped area of the lower end forms the aforementioned movable area 314.

[0058] As shown in Figure 4 , 5 , in order to facilitate the user's hand operation, a pair of sheet-shaped operation portions 50 are protruded along the radial direction of the nut sleeve 20, the operation portion 50 and the top surface of the nut sleeve 20 are connected as a whole through a sheet-shaped base plate 51, and the clamping portion 40 is integrally arranged on the upper end of the base plate 51, so that when the nut sleeve 20 slides to the predetermined position, the nut sleeve 20 can be conveniently rotated and controlled through the operation portion 50.

[0059] In the embodiment, the bottom edge of the buckle piece 35 forms an inclined first guide corner surface 352, so as to facilitate the buckle piece 35 to penetrate into the mounting groove 341.

[0060] In this embodiment, the bottom of the matching groove 31 is provided with an inclined second guide surface 36, so that the upper end of the holding part 40 is easily inserted into the limiting area 312.

[0061] The operation process and beneficial effects of the utility model are as follows:

[0062] Firstly, taking the connection between the toilet base and the toilet cover as an example, the toilet cover base is opposite to the mounting hole, the bolt 10 is sequentially inserted into the rod body 11 through the toilet cover base and the corresponding mounting hole, and then the clamping part 30 and the nut sleeve 20 assembled in the clamping part 30 are sequentially sleeved on the rod body 11 from the inside of the toilet base. At this time, when the nut sleeve 20 is pushed upward, the clamping point 45 is located at the lower end of the clamping ring 32, the contact position of the clamping point 45 and the clamping ring 32 serves as the supporting point of the clamping part 30, the gap is formed between the guide surface 44 and the matching surface 313, so that the internal thread 43 of the holding part 40 is located away from the external thread 13 of the rod body 11. When the nut sleeve 20 and the clamping part 30 are pushed to the inner top of the toilet seat, the clamping part 30 is in contact with the inner top of the toilet seat and cannot continue to move upward. At this time, under the pushing of the user's hand, the clamping point 45 on the nut sleeve 20 and the clamping ring 32 are deformed, so that the clamping point 45 moves to the position of the upper end of the clamping ring 32, and then the guide surface 44 can realize contact with the matching surface 313. Under the pushing force and the guiding effect of the matching surface 313, the plurality of holding parts 40 are deformed and deviated towards the central position of the rod body 11, the internal thread 43 of the holding part 40 is connected with the external thread 13 of the rod body 11, so as to realize the threaded connection between the nut sleeve 20 and the threaded rod. Then, the user's hand continues to rotate the nut sleeve 20, so that the nut sleeve 20 and the threaded rod are further held, and finally the whole quick locking structure is stably fixed on the toilet base, so as to realize the purpose of fixing the toilet cover base on the mounting hole of the toilet base, thereby facilitating the subsequent installation and fixation of the toilet cover.

[0063] The utility model discloses the cooperative movement mode of clamping part 30 and nut sleeve 20 is optimized, the problem that the existing quick mounting locking structure is easy to occur in the installation process is solved, the installation efficiency is improved, and the locking stability is enhanced. Its main beneficial effects are as follows:

[0064] 1、Adopt the cooperation of deformable first stop structure and second stop structure, so that the clamping part 30 and the nut sleeve 20 maintain reasonable gap during pushing, avoid sliding resistance caused by early contact, and ensure smooth installation.

[0065] 2、Through the design of the holding part 40 of the nut sleeve 20, it maintains a proper loose state during pushing, and then applies pressure through the guide surface 44 of the clamping part 30 when locking, realizing quick and stable locking.

[0066] 3、The design of the sheet-shaped operation part 50 improves the convenience of hand operation, making the rotary locking more relaxed and efficient.

[0067] 4. The design of the embracing part 40 is distributed around, and cooperates with the conical matching surface 313, so that the embracing part 40 is uniformly stressed, the locking strength is improved, and loosening is prevented.

[0068] 5. The structure is compact, is suitable for the installation environment of a narrow space such as a toilet and a water tank, and ensures that assembly can be efficiently completed in a limited space.

[0069] In summary, the first stop structure and the second stop structure are cooperated to make the clamping part 30 and the nut sleeve 20 keep a reasonable gap during the pushing process, so that the sliding resistance caused by early contact is avoided, the existing quick-mounting locking structure is effectively solved from the problem of jamming during the installation process, the construction efficiency is improved, the locking stability is enhanced, and the utility model is suitable for various installation scenes.

[0070] The utility model is described above in conjunction with the drawings, and obviously, the specific implementation of the utility model is not limited by the above method, as long as various non-essential improvements are adopted by using the method concept and the technical scheme of the utility model, or the concept and the technical scheme of the utility model are directly applied to other occasions without improvement, and all fall within the protection scope of the utility model.

Claims

1. A multi-scene application kitchen and bathroom quick-mount locking structure, comprising a bolt (10) with an external thread (13), a nut sleeve (20) and a clamping piece (30) which are sequentially and slidingly sleeved on the bolt (10), the upper end of the nut sleeve (20) is slotted to form a plurality of clamping portions (40) which are distributed around the through slot (21) and can be deflected and deformed, the inner side of the clamping portion (40) forms an internal thread (43) matched with the external thread (13), the outer side wall of the clamping portion (40) forms an inclined guide surface (44), the clamping piece (30) is internally provided with a matching groove (31) for the clamping portion (40) at the top of the nut sleeve (20) to pass through, and the top of the matching groove (31) forms a tapered matching surface (313) matched with the guide surface (44), characterized in that, The bottom of the matching groove (31) is provided with a deformable first stop structure, the outer side wall of each of the clamping portions (40) and below the guide surface (44) is provided with a second stop structure matched with the first stop structure, when the first stop structure is located below the second stop structure, the guide surface (44) and the matching surface (313) have a gap.

2. The kitchen and bathroom quick-mount locking structure for multiple scenes according to claim 1, characterized in that, The first stop structure and the second stop structure are respectively a ring (32) and a clamping point (45), and a plurality of clamping points (45) are arranged at the same horizontal height.

3. The kitchen and bathroom quick-mount locking structure for multiple scenes according to claim 2, characterized in that, The bottom of the clamping part (30) is concave inwardly and forms an annular deformation groove (33), and the design position of the ring (32) is located in the coverage range of the deformation groove (33).

4. The kitchen and bathroom quick-mount locking structure for multiple scenes according to claim 2, characterized in that, The surface of the clamping point (45) is arc-shaped, and the upper and lower sides thereof are connected to the side wall of the clamping portion (40) in an arc-shaped transition.

5. The multi-scene application bathroom quick-mount locking structure according to claim 1, characterized in that, The clamping portion (40) includes a deformation section (41) connected to the top of the nut sleeve (20) and a connecting section (42) arranged at the top of the deformation section (41), the inner side of each of the connecting sections (42) forms a continuous internal thread (43) matched with the external thread (13) of the rod body (11), and the guide surface (44) is arranged at the outer side of the connecting end.

6. The multi-scene application bathroom quick-mount locking structure according to claim 1, characterized in that, The clamping part (30) includes a base body (34) and a clamping buckle (35), the upper end of the base body (34) forms a mounting groove (341) matched with the clamping buckle (35), the clamping buckle (35) is clamped and mounted in the mounting groove (341), and the matching surface (313) is arranged at the inner bottom of the clamping buckle (35).

7. The kitchen and bathroom quick-mount locking structure of multiple scenes according to claim 6, characterized in that, The side wall of the clamping buckle (35) surrounds the circumferential side thereof to form an annular clamping groove (351), and the side wall of the mounting groove (341) is provided with a plurality of clamping blocks (342) limited matched with the clamping groove (351).

8. The kitchen and bathroom quick-mount locking structure for multiple scenes according to claim 6, characterized in that, The bottom edge of the clamping buckle (35) forms an inclined first guide corner surface (352).

9. The multi-scene application bathroom quick-mount locking structure according to claim 1, characterized in that, The bottom of the matching groove (31) is provided with an inclined second guide corner surface (36).

10. The multi-scene application bathroom quick-mount locking structure according to claim 1, characterized in that, The nut sleeve (20) is symmetrically provided with a sheet-shaped operation portion (50) on the circumferential side.

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