Safety protection mechanism of electric saw

Abstract

The utility model discloses a safety protection mechanism of an electric saw, which comprises a front protective cover, and the front protective cover comprises a first cover body and a second cover body which are arranged in a split manner; the first cover body can swing between a first position and a second position relative to the frame, and when the first cover body is located at the first position, the first cover body and the second cover body are in limiting fit for limiting upward swinging of the second cover body; when the first cover body is located at the second position, the first cover body and the second cover body are matched in a staggered mode so as to relieve limiting of the second cover body. The front protective cover comprises the first cover body and the second cover body which are arranged in a split mode, when the first cover body is located at the first position, the whole front protective cover has a large arc length, and then the front protective cover shields the cutting edge at the front end of the saw blade; when the first cover body is located at the second position, the second cover body swings upwards along with downward pressing of the frame and is arranged outside the first cover body in a covering mode, the front protective cover has the small arc length, and therefore the lower end of the front protective cover cannot interfere with the workpiece to be cut.

Description

Technical Field

[0001] This utility model relates to the field of electric saw technology, and in particular to a safety protection mechanism for an electric saw. Background Technology

[0002] Existing compound saws with miter cutting capabilities typically include a base, a movable platform, a frame, and a head assembly. The head assembly is mounted on the frame and has a saw blade housed within the frame but partially exposed. The specific structure and working principle of the compound saw can also be found in a compound saw disclosed in Chinese Invention Patent (Publication No.: CN105081453A). For safety, a protective cover is installed on the saw blade. This cover typically includes a front cover and a rear cover, which work together to protect the saw blade's cutting edge. When the far hinge end of the frame is tilted upwards, the front cover swings downwards relative to the frame to shield the cutting edge of the saw blade. When the tilted end of the frame is pressed down, the front cover swings upwards relative to the frame to expose the cutting edge of the saw blade for cutting.

[0003] In existing technologies, the front guard of compound saws is mostly designed as a single piece, which limits the actual effective protection area. If the protection range is expanded by increasing the arc length of the guard (i.e., increasing the central angle), the upward swing is constrained by the movable platform, resulting in insufficient swing angle of the front guard. When the downward frame cuts the workpiece, the front guard with its large central angle is prone to interference with the workpiece at its lower end due to insufficient swing stroke.

[0004] Therefore, it is necessary to improve the existing technology. Utility Model Content

[0005] The purpose of this utility model is to address the defects and deficiencies of the existing technology by providing a safety protection mechanism for an electric saw, including a front protective cover. The front protective cover includes a first cover and a second cover that are separately arranged. The first cover can swing between a first position and a second position relative to the frame, so that the first cover and the second cover have two engagement states, which can meet the protection requirements of the saw blade edge without interfering with the workpiece to be cut.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A safety protection mechanism for an electric saw includes a front protective cover, comprising a first cover and a second cover that are separately configured. The upper end of the first cover is hinged to the frame of the electric saw. The first cover can swing relative to the frame between a first position and a second position. An elastic locking mechanism is provided between the frame and the first cover, which ensures that the first cover always tends to move towards the first position. The center of the second cover is hinged to the frame. When the frame is pressed down, the first cover moves down synchronously with the frame, and the second cover swings upward relative to the first cover. When the frame is tilted upward, the first cover moves up synchronously with the frame, and the second cover swings downward relative to the first cover. When the first cover is in the first position, the first cover and the second cover are in a limiting engagement to restrict the upward swing of the second cover. When the first cover is in the second position, the first cover and the second cover are in a misaligned engagement to release the limiting engagement of the second cover.

[0008] Furthermore, it also includes a linkage rod, one end of which is eccentrically hinged to the second cover, and the other end of which is hinged to the base of the electric saw.

[0009] Furthermore, the linkage rod is provided with an oblong hole, and the linkage rod is hinged to the base through the oblong hole; a torsion spring is provided between the second cover and the frame, and the torsion spring causes the second cover to always have a downward swinging motion tendency relative to the frame; when the frame performs a downward pressing action, the second cover swings upward relative to the first cover under the action of the linkage rod; when the frame performs an upward tilting action, the second cover swings downward relative to the first cover under the action of the torsion spring.

[0010] Furthermore, the elastic locking mechanism includes a transmission rod and a compression spring. The transmission rod is fixedly connected to the first cover, and the compression spring is abutted between the frame and the first cover, so that the first cover always tends to move toward the first position.

[0011] Furthermore, the first cover is provided with a first stop block, the frame is provided with a second stop block that corresponds to and cooperates with the first stop block, and the transmission rod and the compression spring are sequentially arranged between the first stop block and the second stop block.

[0012] Furthermore, the transmission rod is fixedly connected to the first stop by bolts, and the compression spring is sleeved on the outer periphery of the bolts.

[0013] Furthermore, the first stop is provided with a retaining edge to restrict the rotation of the transmission rod.

[0014] Furthermore, the lower end of the first cover is provided with a first protrusion that abuts against the upper edge of the second cover.

[0015] Furthermore, the upper end of the second cover is provided with a protruding ridge, and a slot is formed between every two adjacent protruding ridges; the lower end of the first cover is provided with a second protrusion, and a locking block is provided on the second protrusion, the locking block engaging with the slot; the protruding ridge is provided with a first inclined surface, the second protrusion is provided with a second inclined surface, and the first inclined surface and the second inclined surface abut against each other.

[0016] With the above structure, the beneficial effects of this utility model are as follows: The safety protection mechanism for an electric saw of this utility model includes a front protective cover, which includes a first cover and a second cover that are separately arranged; the first cover can swing relative to the frame between a first position and a second position with a first hinge point as the rotation center; an elastic locking mechanism is provided between the frame and the first cover, which makes the first cover always tend to move towards the first position; when the first cover is in the first position, the first cover and the second cover are in a limiting fit to restrict the second cover from swinging upward; when the first cover is in the second position, the first cover and the second cover are in a misaligned fit to release the limiting fit on the second cover. The front protective cover of this utility model includes a first cover and a second cover that are separately arranged. When the first cover is in the first position, the first cover and the second cover are in a limiting fit, so that the front protective cover as a whole has a large arc length (i.e. a large central angle), thereby allowing the front protective cover to block the cutting edge of the saw blade. When the first cover is in the second position, the first cover and the second cover are in a misaligned fit to release the limiting fit on the second cover. At this time, the second cover swings upward as the frame is pressed down and covers the outside of the first cover, so that the front protective cover has a small arc length (i.e. a small central angle), thereby preventing its lower end from interfering with the workpiece to be cut. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model, the accompanying drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model. Figure 1 (The first cover is located in the first position);

[0019] Figure 2 This is a schematic diagram of the overall structure of this utility model. Figure 2 (The first cover is located in the second position);

[0020] Figure 3 This is a schematic diagram of the connection between the first cover and the second cover of this utility model. Figure 1 (The first cover is located in the first position);

[0021] Figure 4 This is a cross-sectional view of the first cover and the second cover of this utility model in cooperation and connection (the first cover is located in the first position);

[0022] Figure 5 This is a schematic diagram of the connection between the first cover and the second cover of this utility model. Figure 2 (The first cover is located in the second position);

[0023] Figure 6 This is a schematic diagram showing the connection between the elastic locking mechanism of this utility model and the first cover and frame.

[0024] Figure 7 This is the utility model Figure 6 Enlarged schematic diagram of the structure at point A;

[0025] Figure 8 This is an exploded view of the elastic locking mechanism, the first cover, the second cover, and the frame of this utility model;

[0026] Figure 9 This is a schematic diagram of the connection between the first cover and the second cover of this utility model. Figure 3 (The first cover is located in the first position);

[0027] Figure 10 This is the utility model Figure 9 Enlarged schematic diagram of the structure at point B;

[0028] Figure 11 This is an exploded view of the first and second covers of this utility model;

[0029] Figure 12 This is a three-dimensional schematic diagram of the first cover of this utility model;

[0030] Figure 13 This is a three-dimensional schematic diagram of the second cover of this utility model.

[0031] Figures 1 to 13 The winning number is:

[0032] 1. First cover; 11. First stop block; 111. Side guard; 12. First protrusion; 13. Second protrusion; 131. Locking block; 132. Second inclined surface; 14. First hinge hole; 2. Second cover; 21. Protruding ridge; 211. First inclined surface; 22. Slot; 23. Second hinge hole; 24. First insertion hole; 3. Elastic locking mechanism; 31. Transmission rod; 32. Compression spring; 33. Bolt; 4. Torsion spring; 41. First grab hook; 42. Second grab hook; 5. Linkage rod; 51. Waist-shaped hole; 52. Screw; 100. Electric saw; 101. Frame; 1011. Second stop block; 1012. Second insertion hole; 1013. Square hole; 102. Saw blade; 103. Base; 1031. Base support. Detailed Implementation

[0033] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0034] In the description of this utility model, it should be understood that if terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, the term "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0036] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] In this utility model, unless otherwise explicitly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact, or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0038] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this invention are for illustrative purposes only and do not represent the only possible implementation.

[0039] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0040] like Figures 1 to 13As shown, a safety protection mechanism for an electric saw includes a front protective cover, which comprises a first cover 1 and a second cover 2 arranged separately. The upper end of the first cover 1 is hinged to the frame 101 of the electric saw 100. The first cover 1 can swing relative to the frame 101 between a first position and a second position. An elastic locking mechanism 3 is provided between the frame 101 and the first cover 1, which makes the first cover 1 always tend to move towards the first position. The center of the second cover 2 is hinged to the frame 101. When the first cover 1 is pressed down, it moves down synchronously with the frame 101, and the second cover 2 swings upward relative to the first cover 1. When the frame 101 is tilted upward, the first cover 1 moves up synchronously with the frame 101, and the second cover 2 swings downward relative to the first cover 1. When the first cover 1 is in the first position, the first cover 1 and the second cover 2 are in a limiting engagement to restrict the upward swing of the second cover 2. When the first cover 1 is in the second position, the first cover 1 and the second cover 2 are in a misaligned engagement to release the limiting engagement of the second cover 2. The system also includes a linkage rod 5, one end of which is eccentrically hinged to the second cover 2, and the other end of which is hinged to the base 103 of the electric saw 100. The linkage rod 5 is provided with an oblong hole 51, and the linkage rod 5 is hinged to the base 103 through the oblong hole 51. A torsion spring 4 is provided between the second cover 2 and the frame 101. The torsion spring 4 causes the second cover 2 to always have a downward swinging tendency relative to the frame 101. When the frame 101 performs a downward pressing action, the second cover 2 swings upward relative to the first cover 1 under the action of the linkage rod 5. When the frame 101 performs an upward tilting action, the second cover 2 swings downward relative to the first cover 1 under the action of the torsion spring 4. When the first cover 1 is in the first position, the lower end of the first cover 1 abuts against the upper edge of the second cover 2. When the first cover 1 is in the second position, the second cover 2 covers the outside of the first cover 1. The lower end of the first cover 1 is provided with a first protrusion 12 that abuts against the upper edge of the second cover 2. The elastic locking mechanism 3 includes a transmission rod 31 and a compression spring 32. The transmission rod 31 is fixedly connected to the first cover 1, and the compression spring 32 is abutted between the frame 101 and the first cover 1 so that the first cover 1 always has a tendency to move toward the first position.

[0041] Based on the above embodiments, the present invention aims to provide a safety protection mechanism for an electric saw, including a front protective cover. The front protective cover includes a first cover 1 and a second cover 2, which are separately arranged. The first cover 1 can swing relative to the frame 101 between a first position and a second position with a first hinge point as the rotation center. An elastic locking mechanism 3 is provided between the frame 101 and the first cover 1. The elastic locking mechanism 3 makes the first cover 1 always tend to move towards the first position. When the first cover 1 is in the first position, the first cover 1 and the second cover 2 are in a limiting engagement to restrict the second cover 2 from swinging upward. When the first cover 1 is in the second position, the first cover 1 and the second cover 2 are in a misaligned engagement to release the limiting of the second cover 2. The front protective cover of this utility model includes a first cover 1 and a second cover 2 arranged separately. When the first cover 1 is in the first position, the first cover 1 and the second cover 2 are in a limiting fit, so that the front protective cover has a large arc length (i.e. a large central angle), thereby allowing the front protective cover to block the cutting edge of the front end of the saw blade 102. When the first cover 1 is in the second position, the first cover 1 and the second cover 2 are in a misaligned fit to release the limiting fit on the second cover 2. At this time, the second cover 2 swings upward as the frame 101 is pressed down and covers the outside of the first cover 1, so that the front protective cover has a small arc length (i.e. a small central angle), thereby preventing its lower end from interfering with the workpiece to be cut.

[0042] In this embodiment, a linkage rod 5 is provided between the second cover 2 and the base 103 of the electric saw 100. Specifically, the base 103 is provided with a base bracket 1031, one end of the linkage rod 5 is hinged to the second cover 2, and the other end of the linkage rod 5 is hinged to the base bracket 1031. When the frame 101 tilts up or down, the second cover 2 swings downward or upward relative to the first cover 1 under the drive of the linkage rod 5.

[0043] In a further preferred embodiment, the linkage rod 5 is provided with an oblong hole 51, and a screw 52 is provided inside the oblong hole 51. The screw 52 passes through the oblong hole 51 and is fixedly connected to the base bracket 1031. The oblong hole 51 allows the second cover 2 to be manually swung up and down to facilitate the replacement of the saw blade 102. Because the oblong hole 51 prevents the linkage rod 5 from driving the second cover 2 to swing down when the frame 101 is tilted upward, a torsion spring 4 is provided between the second cover 22 and the frame 101. The first end of the torsion spring 4 is provided with a first hook 41, and the second cover 2 is provided with a first insertion hole 24 for engaging with the first hook 41; the second end of the torsion spring 4 is provided with a second hook 42, and the frame 101 is provided with a second insertion hole 1012 for engaging with the second hook 42. When the frame 101 tilts upward, the second cover 2 swings downward under the elastic force of the torsion spring 4; when the frame 101 is pressed down, the second cover 2 swings upward against the elastic force of the torsion spring 4 under the drive of the linkage rod 5.

[0044] In another preferred embodiment of this utility model, the first cover 1 is provided with a first stop 11, and the frame 101 is provided with a second stop 1011 that corresponds to and cooperates with the first stop 11. The transmission rod 31 and the compression spring 32 are sequentially arranged between the first stop 11 and the second stop 1011. The transmission rod 31 is fixedly connected to the first stop 11 by bolts 33, and the compression spring 32 is sleeved on the outer periphery of the bolts 33. The first stop 11 is provided with a retaining edge 111 to limit the rotation of the transmission rod 31. In this embodiment, as... Figure 6 and Figure 7As shown, a square hole 1013 is provided on the frame 101. The second stop 1011 is located on one side of the square hole 1013, and the first stop 11 extends out of the square hole 1013 and is located on the other side of the square hole 1013, so that the first stop 11 and the second stop 1011 are arranged facing each other. The transmission rod 31 is fixedly connected to the first stop 11. When pressure is applied to the transmission rod 31, the first stop 11 is also subjected to pressure, causing the first stop 11 to move closer to the second stop 1011, thereby causing the first cover 1 to move away from the second cover 2, until the first protrusion 12 disengages from and abuts against the upper edge of the second cover 2, thereby releasing the restriction of the first cover 1 on the second cover 2. When the pressure on the transmission rod 31 is released, the first stop 11 and the transmission rod 31 move away from the second stop 1011 under the elastic force of the compression spring 32. This causes the first cover 1 to move closer to the second cover 2. When the second cover 2 swings downwards until its upper edge aligns with the first protrusion 12 of the first cover 1, the first protrusion 12 automatically abuts against the upper edge of the second cover 2, thus limiting the first cover 1's position on the second cover 2. In this embodiment, the first stop 11 is provided with a retaining edge 111. When the transmission rod 31 is fixedly connected to the first stop 11, the retaining edge 111 limits the transmission rod 31, restricting its rotation.

[0045] As another preferred embodiment of this utility model, the upper end of the second cover 2 is provided with a protruding ridge 21, and a slot 22 is formed between every two adjacent protruding ridges 21; the lower end of the first cover 1 is provided with a second protrusion 13, and a locking block 131 is provided on the second protrusion 13, the locking block 131 engaging with the slot 22; the protruding ridge 21 is provided with a first inclined surface 211, and the second protrusion 13 is provided with a second inclined surface 132, the first inclined surface 211 and the second inclined surface 132 abutting against each other. In this embodiment, as... Figure 10 , Figure 12 and Figure 13 As shown, when the lower end of the first cover 1 abuts against the upper end of the second cover 2, that is, when the first protrusion 12 of the first cover 1 abuts against the upper edge of the second cover 2, the locking block 131 of the second protrusion 13 is engaged in the locking groove 22, and the first inclined surface 211 of the protrusion 21 abuts against the second inclined surface 132 of the second protrusion 13, thereby improving the stability of the locking point and enabling the first cover 1 to stably and reliably limit the second cover 2.

[0046] As another preferred embodiment of this utility model, the upper end of the first cover 1 is provided with a first hinge hole 14, and the first cover 1 swings relative to the frame 101 between a first position and a second position with the first hinge hole 14 as the first hinge point; the center of the second cover 2 is provided with a second hinge hole 23, and the second cover 2 swings upward and downward relative to the first cover 1 with the second hinge hole 23 as the second hinge point. In this embodiment, as... Figure 4 and Figure 8 As shown, during installation, a first screw is inserted into the first hinge hole 14, and the first screw provides a fulcrum for the rotation of the first cover 1; a second screw is inserted into the second hinge hole 23, and the second screw provides a fulcrum for the rotation of the second cover 2.

[0047] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this utility model.

Claims

1. A safety protection mechanism for an electric saw, comprising a front protective cover, characterized in that: The front protective cover includes a first cover (1) and a second cover (2) that are set in separate parts; The upper end of the first cover (1) is hinged to the frame (101) of the electric saw (100). The first cover (1) can swing between a first position and a second position relative to the frame (101). An elastic locking mechanism (3) is provided between the frame (101) and the first cover (1). The elastic locking mechanism (3) makes the first cover (1) always tend to move toward the first position. The center of the second cover (2) is hinged to the frame (101). When the frame (101) presses down, the first cover (1) moves down synchronously with the frame (101), and the second cover (2) swings upward relative to the first cover (1). When the frame (101) tilts upward, the first cover (1) moves up synchronously with the frame (101), and the second cover (2) swings downward relative to the first cover (1). When the first cover (1) is in the first position, the first cover (1) and the second cover (2) are in a limiting engagement to restrict the second cover (2) from swinging upward; when the first cover (1) is in the second position, the first cover (1) and the second cover (2) are in a misaligned engagement to release the limiting of the second cover (2).

2. The safety protection mechanism for an electric saw according to claim 1, characterized in that: It also includes a linkage rod (5), one end of which is eccentrically hinged to the second cover (2), and the other end of which is hinged to the base (103) of the electric saw (100).

3. The safety protection mechanism for an electric saw according to claim 2, characterized in that: The linkage rod (5) is provided with a waist-shaped hole (51), and the linkage rod (5) is hinged to the base (103) through the waist-shaped hole (51); a torsion spring (4) is provided between the second cover (2) and the frame (101), and the torsion spring (4) makes the second cover (2) always have a downward swinging motion tendency relative to the frame (101); when the frame (101) performs a downward pressing action, the second cover (2) swings upward relative to the first cover (1) under the action of the linkage rod (5), and when the frame (101) performs an upward tilting action, the second cover (2) swings downward relative to the first cover (1) under the action of the torsion spring (4).

4. The safety protection mechanism for an electric saw according to claim 1, characterized in that: When the first cover (1) is in the first position, the lower end of the first cover (1) abuts against the upper edge of the second cover (2); when the first cover (1) is in the second position, the second cover (2) covers the outside of the first cover (1).

5. The safety protection mechanism for an electric saw according to claim 1, characterized in that: The elastic locking mechanism (3) includes a transmission rod (31) and a compression spring (32). The transmission rod (31) is fixedly connected to the first cover (1), and the compression spring (32) is abutted between the frame (101) and the first cover (1) so that the first cover (1) always tends to move toward the first position.

6. The safety protection mechanism for an electric saw according to claim 5, characterized in that: The first cover (1) is provided with a first stop (11), the frame (101) is provided with a second stop (1011) that corresponds to and cooperates with the first stop (11), and the transmission rod (31) and the compression spring (32) are sequentially arranged between the first stop (11) and the second stop (1011).

7. The safety protection mechanism for an electric saw according to claim 6, characterized in that: The transmission rod (31) is fixedly connected to the first stop (11) by bolts (33), and the compression spring (32) is sleeved on the outer periphery of the bolt (33).

8. The safety protection mechanism for an electric saw according to claim 6, characterized in that: The first stop (11) is provided with a stop (111) to limit the rotation of the transmission rod (31).

9. The safety protection mechanism for an electric saw according to claim 4, characterized in that: The lower end of the first cover (1) is provided with a first protrusion (12) that abuts against the upper edge of the second cover (2).

10. The safety protection mechanism for an electric saw according to claim 4, characterized in that: The upper end of the second cover (2) is provided with a protruding ridge (21), and a slot (22) is formed between every two adjacent protruding ridges (21); the lower end of the first cover (1) is provided with a second protrusion (13), and a locking block (131) is provided on the second protrusion (13), and the locking block (131) engages with the slot (22); the protruding ridge (21) is provided with a first inclined surface (211), and the second protrusion (13) is provided with a second inclined surface (132), and the first inclined surface (211) and the second inclined surface (132) abut against each other.

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