Dust and water protection system

Abstract

The present invention relates to the technical field of protection systems, and provides a dust and water protection system including a seat body and a dust cover; an anti-foolproof guide mechanism for guiding the dust cover to slide in a predetermined direction to cover the seat body is provided between the seat body and the dust cover; a buckle mechanism is provided between the seat body and the dust cover; when the dust cover is covered on the seat body, the dust cover is detachably buckled on the seat body through the buckle mechanism. The dust cover slides in a predetermined direction and covers the seat body under the guidance of the anti-foolproof guide mechanism, which reduces the difficulty of covering the dust cover; the dust cover maintains a stable covering direction in a predetermined direction under the guidance of the anti-foolproof guide mechanism, which avoids the difficulty of covering caused by the disorder of the direction during the covering process of the dust cover, and the anti-foolproof guide mechanism also avoids the dust cover from covering incorrectly; when the dust cover is covered on the seat body, the buckle mechanism can prevent the dust cover from loosening, and is also easy to disassemble.

Description

Technical Field

[0001] The present invention belongs to the technical field of protection systems, and more specifically, relates to a dust and water protection system. Background Art

[0002] The existing power switch will inevitably be contaminated by dust during long-term use. The dust cover is usually directly covered on the switch base, but the dust cover and the base are generally not firm and are easy to loosen; and the cover is also difficult to cover. Summary of the invention

[0003] The object of the present invention is to provide a dust and water protection system to solve the technical problems existing in the prior art that the dust cover and the base body are not firm and the dust cover is difficult to install.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a dust and water protection system including a seat body and a dust cover; an anti-foolproof guide mechanism is arranged between the seat body and the dust cover to guide the dust cover to slide in a predetermined direction to cover the seat body; a snap mechanism is arranged between the seat body and the dust cover; when the dust cover is covered on the seat body, the dust cover can be detachably snapped on the seat body through the snap mechanism.

[0005] Furthermore, the snap mechanism includes a recessed portion arranged on the outer wall of the seat body and a raised portion arranged on the inner wall of the dust cover and used to be snapped into the recessed portion; the recessed portion has a first planar inner wall, and the raised portion has a planar stopper outer wall used to abut against the first inner wall, and the first inner wall is located on the moving path of the stopper outer wall when the dust cover is removed.

[0006] Furthermore, the protrusion has a guiding surface for guiding the protrusion to be inserted into the recessed portion when the dust cover is placed on the base.

[0007] Furthermore, the guide surface and the stop outer wall are connected via a transition surface in the form of an arc.

[0008] Further, in the disassembly direction of the dust cover, the first inner wall and the stop outer wall are respectively perpendicular to the disassembly direction.

[0009] Furthermore, the recessed portion also includes a second inner wall, a third inner wall, and a fourth inner wall, which are respectively planar; the first inner wall is arranged parallel to the second inner wall; the first inner wall, the second inner wall, the third inner wall and the fourth inner wall together form the recessed portion; and a predetermined angle is formed between the third inner wall and the fourth inner wall.

[0010] Furthermore, the fool-proof guiding mechanism includes a convex strip and a groove; the outer surface of the seat body is convex to form the convex strip extending along the predetermined direction, and the inner wall of the dust cover is concave to form the groove adapted to the convex strip; a notch is opened on the edge of the bottom wall of the groove.

[0011] Furthermore, the notch extends along the predetermined direction.

[0012] Furthermore, in the predetermined direction, the width of the notch gradually increases.

[0013] Furthermore, it also includes a waterproof gasket, which includes an elastic sheet body, an assembly hole is opened on the sheet body, the seat body is inserted into the assembly hole, and the two side surfaces of the sheet body are respectively a first side surface and a second side surface; the first side surface of the sheet body is recessed to form a plurality of first recessed parts, and a first water-stopping rib is formed between any two adjacent first recessed parts; the edge of the first side surface is ring-shaped to form a second water-stopping rib.

[0014] The beneficial effects of the dust and water protection system provided by the present invention are as follows: compared with the prior art, in the dust and water protection system provided by the present invention, when the dust cover is covered on the seat body, the dust cover slides in a predetermined direction and covers the seat body under the guidance of the anti-foolproof guide mechanism, thereby reducing the difficulty of covering the dust cover; the dust cover maintains a stable covering direction in the predetermined direction under the guidance of the anti-foolproof guide mechanism, thereby avoiding the difficulty of covering due to the disorder of direction during the covering process of the dust cover, and at the same time, the anti-foolproof guide mechanism also avoids the dust cover from being covered incorrectly; when the dust cover is covered on the seat body, the snap mechanism can prevent the dust cover from loosening and is also easy to disassemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 Schematic diagram of the three-dimensional structure of the dust and water protection system provided in an embodiment of the present invention Figure 1 ;

[0017] Figure 2 Schematic diagram of the three-dimensional structure of the seat provided in the embodiment of the present invention Figure 1 ;

[0018] Figure 3 for Figure 2 The enlarged schematic diagram at A in the middle;

[0019] Figure 4Schematic diagram of the three-dimensional structure of the seat provided in the embodiment of the present invention Figure 2 ;

[0020] Figure 5 for Figure 4 The enlarged schematic diagram of point B in the middle;

[0021] Figure 6 Schematic diagram of the three-dimensional structure of the dust cover provided by the embodiment of the present invention Figure 1 ;

[0022] Figure 7 for Figure 6 The enlarged schematic diagram at C in the middle;

[0023] Figure 8 Schematic diagram of the three-dimensional structure of the dust cover provided by the embodiment of the present invention Figure 2 ;

[0024] Fig. 9 for Figure 8 The enlarged schematic diagram at D in the middle;

[0025] Fig.10 Schematic diagram of the three-dimensional structure of the dust and water protection system provided in an embodiment of the present invention Figure 2 ;

[0026] Fig.11 Schematic diagram of the three-dimensional structure of the seat provided in the embodiment of the present invention Figure 3 ;

[0027] Fig.12 for Fig.11 The enlarged schematic diagram at E in the middle;

[0028] Fig.13 Schematic diagram of the three-dimensional structure of the dust cover provided by the embodiment of the present invention Figure 3 ;

[0029] Fig.14 for Fig.13 The enlarged schematic diagram at F in the middle;

[0030] Fig.15 Schematic diagram of the three-dimensional structure of the dust cover provided by the embodiment of the present invention Figure 4 ;

[0031] Fig.16 for Fig.15 The enlarged schematic diagram of G in the middle;

[0032] Fig.17 A schematic diagram of installing a waterproof gasket provided in an embodiment of the present invention;

[0033] Fig.18 A three-dimensional schematic diagram of a waterproof gasket provided in an embodiment of the present invention;

[0034] Fig.19 for Fig.18 Enlarged schematic diagram at H in the middle.

[0035] Among them, the reference numerals in the figure are:

[0036] 1-base; 11-recessed portion; 111-first inner wall; 112-second inner wall; 113-third inner wall; 114-fourth inner wall; 121-convex strip; 2-dust cover; 21-raised portion; 211-stop outer wall; 212-guide surface; 213-transition surface; 22-injection hole; 23-groove; 231-notch; 2311-left side wall; 2312-right side wall; 2313-bottom side wall; 3-sheet; 31-first side surface; 311-first recessed portion; 312-first water-stopping rib; 313-second water-stopping rib; 314-third water-stopping rib; 32-second side surface; 33-installation hole; 34-assembly hole. DETAILED DESCRIPTION

[0037] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0038] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0039] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and 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 orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0041] Please also refer to Figures 1 to 9The dust and water protection system provided by the present invention is now described. The dust and water protection system comprises a seat body 1 and a dust cover 2; a foolproof guide mechanism for guiding the dust cover 2 to slide in a predetermined direction to cover the seat body 1 is provided between the seat body 1 and the dust cover 2 (foolproof: prevent the dust cover 2 from covering the wrong position); a buckle mechanism is provided between the seat body 1 and the dust cover 2; when the dust cover 2 is covered on the seat body 1, the dust cover 2 is detachably buckled on the seat body 1 through the buckle mechanism.

[0042] In this way, during the process of the dust cover 2 being covered on the seat body 1, the dust cover 2 slides in a predetermined direction under the guidance of the anti-foolproof guide mechanism and covers the seat body 1, thereby reducing the difficulty of putting on the dust cover 2; the dust cover 2 maintains a stable covering direction in a predetermined direction under the guidance of the anti-foolproof guide mechanism, thereby avoiding the difficulty of covering due to disordered direction during the covering process of the dust cover 2, and at the same time, the anti-foolproof guide mechanism also avoids the dust cover 2 from being covered incorrectly; when the dust cover 2 is covered on the seat body 1, the snap mechanism can prevent the dust cover 2 from loosening and is also easy to disassemble.

[0043] For further information, see Figures 1 to 9 As a specific embodiment of the dust and water protection system provided by the present invention, the snap mechanism includes a recessed portion 11 arranged on the outer wall of the base body 1 and a raised portion 21 arranged on the inner wall of the dust cover 2 and used to be snapped into the recessed portion 11; the recessed portion 11 has a first planar inner wall 111, and the raised portion 21 has a planar stopper outer wall 211 used to abut against the first inner wall 111, and the first inner wall 111 is located on the moving path of the stopper outer wall 211 when the dust cover 2 is removed. In this way, to install the dust cover 2, you only need to put the dust cover 2 on the base body 1 and insert the protrusion 21 into the recessed portion 11; when the protrusion 21 is inserted into the recessed portion 11, if you want to remove the dust cover 2, since the first inner wall 111 on the recessed portion 11 is located on the moving path of the stop outer wall 211 on the protrusion 21, the stop outer wall 211 and the first inner wall 111, which are respectively planar, can be in close contact, and the first inner wall 111 can effectively block the protrusion 21, thereby improving the firmness of the dust cover 2.

[0044] For further information, see Figures 1 to 9 As a specific embodiment of the dust and water protection system provided by the present invention, the protrusion 21 has a guide surface 212 for guiding the protrusion 21 to be inserted into the recess 11 when the dust cover 2 is placed on the base 1. In this way, the protrusion 21 can be easily inserted into the recess 11 through the guide surface 212.

[0045] Optionally, in one embodiment, the guide surface 212 is a plane, so that the plane is easy to process, and the guide surface 212 is easy to slide along the surface of the seat body 1.

[0046] For further information, see Figures 1 to 9As a specific embodiment of the dust and water protection system provided by the present invention, the guide surface 212 is connected to the stopper outer wall 211 through the arc-shaped transition surface 213. In this way, when the guide surface 212 guides the protrusion 21 to be inserted into the recess 11, the arc-shaped transition surface 213 makes it difficult for the protrusion 21 to be stuck.

[0047] For further information, see Figures 1 to 9 As a specific embodiment of the dust and water protection system provided by the present invention, in the removal direction of the dust cover 2, the first inner wall 111 and the stopper outer wall 211 are respectively perpendicular to the removal direction. In this way, when the dust cover 2 is removed, after the stopper outer wall 211 abuts against the first inner wall 111, the dust cover 2 is not easy to be removed, thereby improving the firmness of the dust cover 2.

[0048] Optionally, in one embodiment, there are multiple recessed portions 11 and multiple raised portions 21, and the multiple recessed portions 11 correspond one to one with the multiple raised portions 21. In this way, the cooperation between the multiple raised portions 21 and the recessed portions 11 enables the dust cover 2 to be more firmly fixed on the base body 1.

[0049] Optionally, in one embodiment, the number of the recessed portions 11 and the number of the raised portions 21 are four respectively.

[0050] For further information, see Figures 1 to 9 As a specific embodiment of the dust and water protection system provided by the present invention, the recessed portion 11 also includes a second inner wall 112, a third inner wall 113, and a fourth inner wall 114, which are respectively planes; the first inner wall 111 is arranged parallel to the second inner wall 112; the first inner wall 111, the second inner wall 112, the third inner wall 113 and the fourth inner wall 114 enclose the recessed portion 11; and a predetermined angle is formed between the third inner wall 113 and the fourth inner wall 114. In this way, the mutually parallel first inner wall 111 and the second inner wall 112 are easy to process; and the mutually parallel first inner wall 111 and the second inner wall 112 can easily limit the protrusion 21 between the first inner wall 111 and the second inner wall 112; the first inner wall 111, the second inner wall 112, the third inner wall 113 and the fourth inner wall 114, which are respectively planar, are easy to process; the protrusion 21 is not easily scratched when it contacts the first inner wall 111, the second inner wall 112, the third inner wall 113 and the fourth inner wall 114.

[0051] Optionally, in one embodiment, an injection hole 22 is provided on the dust cover 2. Thus, when the raised portion 21 on the inner side of the dust cover 2 is injection-molded, the dust cover 2 can be positioned through the injection hole 22.

[0052] For further information, see Figures 10 to 16As a specific embodiment of the dust and water protection system provided by the present invention, the foolproof guide mechanism includes a convex strip 121 and a groove 23; the outer surface of the seat body 1 is convexly provided with a convex strip 121 extending in a predetermined direction, and the inner wall recessed portion 11 of the dust cover 2 forms a groove 23 adapted to the convex strip 121; a notch 231 is provided at the edge of the bottom wall of the groove 23. In this way, when installing the dust cover 2, it is only necessary to cover the dust cover 2 on the seat body 1 in a predetermined direction, and the convex strip 121 is inserted into the groove 23. Under the guidance of the convex strip 121, the dust cover 2 can be pushed in the predetermined direction, which is very convenient; because the convex strip 121 and the groove 23 are adapted to each other, the dust cover 2 is prevented from being installed upside down or wrongly; a notch 231 is provided on the bottom wall of the groove 23, and the notch 231 can release the tension exerted on the groove 23 when the convex strip 121 is stuck in the groove 23, making the installation of the dust cover 2 more convenient.

[0053] For further information, see Figures 10 to 16 As a specific embodiment of the dust and water protection system provided by the present invention, the notch 231 extends along a predetermined direction, so that the dust cover 2 can be conveniently covered on the base body 1 along the predetermined direction.

[0054] For further information, see Figures 10 to 16 As a specific implementation of the dust and water protection system provided by the present invention, the width of the notch 231 gradually increases in a predetermined direction, so as to release the stress on the bottom wall of the groove 23 when the notch 231 is stretched open by an external force.

[0055] Optionally, in one embodiment, the top surface of the convex strip 121 is a plane, so that the convex strip 121 and the groove 23 are not prone to collision when they are matched.

[0056] Optionally, in one embodiment, the cross section of the edge of the convex strip 121 is an arc surface. In this way, the edge of the convex strip 121 is not likely to encounter bumps or resistance during the movement of the convex strip 121 relative to the dust cover 2.

[0057] Optionally, in one embodiment, the width of the convex strip 121 is the same in the predetermined direction. In this way, the convex strip 121 is not easily stuck in the groove 23 when sliding in the groove 23 .

[0058] Optionally, in one embodiment, the depth of each part of the groove 23 is the same. In this way, the groove 23 is easier to process, and the convex strip 121 slides more smoothly in the groove 23.

[0059] Optionally, in one embodiment, the notch 231 includes a planar left side wall 2311, a planar right side wall 2312, and a curved bottom side wall 2313; the left side wall 2311, the right side wall 2312, and the bottom side wall 2313 enclose the notch 231. In this way, the curved bottom side wall 2313 can be easily restored when deformed by tension.

[0060] Optionally, in one embodiment, the bottom side wall 2313 is smoothly connected to the left side wall 2311 and the right side wall 2312. In this way, the bottom side wall 2313 is convenient to transmit the force received by itself to the left side wall 2311 and the right side wall 2312 respectively.

[0061] Optionally, in one embodiment, the bottom side wall 2313 is an arc surface.

[0062] For further information, see Figures 17 to 19 As a specific embodiment of the dust and water protection system provided by the present invention, it also includes a waterproof gasket, which includes an elastic sheet 3, an assembly hole 34 is opened on the sheet 3, the base 1 is inserted into the assembly hole 34, and the two side surfaces of the sheet 3 are respectively a first side surface 31 and a second side surface 32; the first side surface 31 of the sheet 3 has a plurality of first recessed portions 311 formed in the recessed portion 11, and a first water-stopping rib 312 is formed between any two adjacent first recessed portions 311; the edge of the first side surface 31 is formed with a second water-stopping rib 313. In this way, when the user clamps the sheet 3 of the waterproof gasket between the seat body 1 and the outer wall of the external device, the seat body 1 can be electrically connected to the external device through the assembly hole 34, and the concave cavity space possessed by the first recessed portion 311 can buffer the deformation of the sheet 3 after being squeezed, which is beneficial for the sheet 3 to maintain its own elasticity after being squeezed, improves the sealing ability, and reduces the penetration of water; in addition, when the user clamps the sheet 3 of the waterproof gasket between the seat body 1 and the outer wall of the external device, the clamping force between the seat body 1 and the outer wall of the external device is borne on the first water-stop rib 312 and the second water-stop rib 313 with smaller force surfaces; the pressure between the first water-stop rib 312 and the second water-stop rib 313 and the seat body 1 / the outer wall of the external device is increased, the waterproof sealing performance is improved, and the penetration of water is reduced; in addition, the second water-stop rib 313 is arranged around the edge of the first side surface 31, which effectively prevents water from penetrating from the edge of the first side surface 31.

[0063] Optionally, in one embodiment, the waterproof grade of the waterproof gasket is IPX7 to IPX8.

[0064] Optionally, in one embodiment, the bottom surface (bottom surface: assuming that the first side surface 31 faces upward) of each first recessed portion 311 is a plane. In this way, when the sheet 3 is squeezed, if the outer wall of the base 1 or the external device contacts the bottom surface of the first recessed portion 311, the bottom surface of the first recessed portion 311 can reduce the deformation of the sheet 3.

[0065] Optionally, in one embodiment, the bottom surfaces of the first recessed portions 311 are coplanar, so that the bottom surfaces of the first recessed portions 311 are subjected to more uniform force.

[0066] Optionally, in one embodiment, the top surface of the first water stop rib 312 and the top surface of the second water stop rib 313 (top surface: assuming the first side surface 31 faces upward) are coplanar. In this way, the first water stop rib 312 and the second water stop rib 313 are subjected to more uniform external forces during the extrusion process.

[0067] Optionally, in one embodiment, a mounting hole 33 is formed on the sheet body 3, and a third water-stop rib 314 surrounding the mounting hole 33 is formed on the first side surface 31. In this way, screws or other fasteners pass through the mounting hole 33 to fix the seat body 1 and the external device, and the third water-stop rib 314 surrounding the mounting hole 33 can prevent the moisture in the mounting hole 33 from penetrating from one side of the first side surface 31 through the third water-stop rib 314 to other places in a clamped state.

[0068] Optionally, in one embodiment, a fourth water-stop rib surrounding the mounting hole 33 is formed on the second side surface 32. In this way, the seat body 1 passes through the mounting hole 33, and the fourth water-stop rib surrounding the mounting hole 33 can prevent the water in the mounting hole 33 from penetrating from one side of the second side surface 32 to other places through the fourth water-stop rib in the clamping state.

[0069] Optionally, in one embodiment, the third water-stopping rib 314 is plane-symmetrical with the fourth water-stopping rib. In this way, when the waterproof gasket is squeezed, the third water-stopping rib 314 and the fourth water-stopping rib are subjected to more uniform force.

[0070] Optionally, in one embodiment, the sheet 3 is an integrally formed piece made of silicone, so that the silicone has good waterproof performance.

[0071] Optionally, in one embodiment, the sheet 3 is an oil-permeable silicone member. In this way, grease is added to the silicone to facilitate the sheet 3 to be more firmly in contact with the seat 1 or external equipment during installation and clamping.

[0072] Optionally, in one embodiment, a plurality of second recessed portions 11, a fifth water-stopping rib and a sixth water-stopping rib are formed on the second side surface 32; each first recessed portion 311 is plane-symmetrical with each second recessed portion 11, the first water-stopping rib 312 is plane-symmetrical with the fifth water-stopping rib, and the second water-stopping rib 313 is plane-symmetrical with the sixth water-stopping rib. In this way, when the first side surface 31 and the second side surface 32 of the waterproof gasket are relatively squeezed, the first side surface 31 and the second side surface 32 are subjected to more uniform force.

[0073] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A dust and water protection system, comprising a seat body and a dust cover; characterized in that: An anti-foolproof guide mechanism is provided between the base body and the dust cover to guide the dust cover to slide in a predetermined direction so as to cover the base body; a buckle mechanism is provided between the base body and the dust cover; when the dust cover is covered on the base body, the dust cover is detachably buckled on the base body through the buckle mechanism; It also includes a waterproof gasket, which includes an elastic sheet body, an assembly hole is opened on the sheet body, the seat body is inserted into the assembly hole, and the two side surfaces of the sheet body are respectively a first side surface and a second side surface; the first side surface of the sheet body is recessed to form a plurality of first recessed parts, and a first water-stop rib is formed between any two adjacent first recessed parts; a second water-stop rib is formed on the edge of the first side surface; a plurality of second recessed parts, a fifth water-stop rib and a sixth water-stop rib are formed on the second side surface; each of the first recessed parts is respectively symmetrical with each of the second recessed parts, the first water-stop rib is symmetrical with the fifth water-stop rib, and the second water-stop rib is symmetrical with the sixth water-stop rib.

2. The dust and water protection system according to claim 1, characterized in that: The snap mechanism includes a recessed portion arranged on the outer wall of the seat body and a raised portion arranged on the inner wall of the dust cover and used to be snapped into the recessed portion; the recessed portion has a first planar inner wall, and the raised portion has a planar stopper outer wall used to abut against the first inner wall, and the first inner wall is located on the moving path of the stopper outer wall when the dust cover is removed.

3. The dust and water protection system according to claim 2, characterized in that: The protrusion has a guiding surface for guiding the protrusion to be inserted into the recessed portion when the dust cover is arranged on the seat body.

4. The dust and water protection system according to claim 3, characterized in that: The guide surface is connected to the stopper outer wall via a transition surface in the form of an arc surface.

5. The dust and water protection system according to claim 2, characterized in that: In the disassembly direction of the dust cover, the first inner wall and the stop outer wall are respectively perpendicular to the disassembly direction.

6. The dust and water protection system according to claim 2, characterized in that: The recessed portion also includes a second inner wall, a third inner wall, and a fourth inner wall, which are respectively planes; the first inner wall is arranged in parallel with the second inner wall; the first inner wall, the second inner wall, the third inner wall and the fourth inner wall enclose the recessed portion; and a predetermined angle is formed between the third inner wall and the fourth inner wall.

7. The dust and water protection system according to any one of claims 1 to 6, characterized in that: The fool-proof guiding mechanism comprises a convex strip and a concave groove; the outer surface of the seat body is convexly provided to form the convex strip extending along the predetermined direction, and the inner wall of the dust cover is concavely provided to form the concave groove matching the convex strip; a notch is provided at the edge of the bottom wall of the concave groove.

8. The dust and water protection system according to claim 7, characterized in that: The notch extends along the predetermined direction.

9. The dust and water protection system according to claim 7, characterized in that: In the predetermined direction, the width of the notch gradually increases.

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