Swing door structure

Abstract

To provide a fitting structure for a hinged door that reduces the step between the surface of the hinged door and the wall surface while suppressing protrusion from the wall surface. [Solution] The hinged door (1) includes two vertical frames (21, 22), a hinged door (1) that can rotate around a hinge, a door stop, a magnetic member, and an attraction member. The hinged door has a pull tab (7A) embedded in its surface. The hinge is positioned so that it is not exposed on the surface of the hinged door when the hinged door is in a state where it closes an opening (110). When the hinged door is in a state where it closes an opening, the distance between the surface of the hinged door and the wall surface in a direction perpendicular to the wall surface (WA) is smaller than the distance between the surface of the vertical frame and the wall surface in the perpendicular direction.

Description

[Technical Field]

[0001] This invention relates to a hinged door structure. [Background technology]

[0002] Patent Document 1 describes a fitting structure in which the door panel of a swing door is set back from the wall surface so that the door handle does not protrude into the passageway that the swing door faces. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-138845 Summary of the Invention [Problem to be solved by the invention]

[0004] In the fitting structure described in Patent Document 1, when the hinged door is closed, the distance between the surface of the hinged door and the wall surface (the first wall surface on the opening side of the hinged door) in the direction perpendicular to the wall surface becomes large. In other words, a relatively large step occurs between the hinged door and the wall surface, and dust and the like easily accumulates in the step.

[0005] If the door panel of a swing door is brought closer to the wall in the direction perpendicular to the wall to reduce the step, the doorknob and hinges will be more likely to protrude from the wall.

[0006] Therefore, the object of the present invention is to provide a hinged door structure that can reduce the step between the surface of the hinged door and the first wall while suppressing protrusion from the first wall. [Means for solving the problem]

[0007] The hinged door structure of the present invention comprises two vertical frames attached to an opening in a wall, a hinged door attached to one of the two vertical frames with a hinge and rotatable around the hinge, a door stop attached to the other vertical frame and facing the door tip on the back side of the hinged door when the hinged door is in a state where it closes the opening, a magnetic member arranged on one of the hinged door and the door stop, and an attracting member arranged on the other of the hinged door and the door stop and attracting to the magnetic member by the magnetic force of the magnetic member when the hinged door is in a state where it closes the opening, the hinged door has a handle embedded in the surface, the hinge is arranged so that it is not exposed on the surface side of the hinged door when the hinged door is in a state where it closes the opening, and when the hinged door is in a state where it closes the opening, the distance between the surface of the hinged door and the first wall surface in a direction perpendicular to the first wall surface of the wall is smaller than the distance between the surface of the vertical frame and the first wall surface in the perpendicular direction.

[0008] This reduces the difference in level between the surface of the hinged door and the first wall when the door is closing the opening. Also, the hinges do not protrude further outward than the surface of the hinged door. The handle protrudes only slightly from the surface of the hinged door. As a result, when the door is closing the opening, it is possible to reduce the difference in level between the surface of the hinged door and the first wall while suppressing protrusion from the first wall. As a result, the difference in level between the first wall and the surface of the hinged door is reduced, making it difficult for dust to accumulate. Even if dust does accumulate, it can be easily removed. Generally, the surface of the vertical frame is positioned at a position that protrudes slightly from the first wall beyond the surface of the baseboard provided on the first wall. In addition, the magnetic member and the attraction member keep the hinged door in a closed state. This means that there is no need to provide a latch receiving portion on the other vertical frame. Therefore, even if the vertical frame is made smaller, it is possible to bring the surface of the hinged door closer to the first wall so that the distance between the surface of the hinged door and the first wall is smaller than the distance between the surface of the vertical frame and the first wall.

[0009] In the present invention, it is preferable that the surface of the hinged door is located between the first wall surface and the surface of the vertical frame when the hinged door closes the opening. This reduces the distance between the surface of the hinged door and the surface of the vertical frame. Therefore, when the hinged door closes the opening, the step between the surface of the hinged door and the surface of the vertical frame is reduced.

[0010] In addition, in the present invention, it is preferable that the magnetic member is built into the hinged door and covered by the surface material that forms the back surface of the hinged door, and the attracting member is a magnetic member built into the door stop and covered by the surface material that forms the front surface of the door stop. In this way, the magnetic member and attracting member are not exposed to the outside when the hinged door is in an open state. Furthermore, because the attracting member is made of a magnetic member, it is easy to obtain the desired attracting force without increasing the magnetic force of each magnetic member.

[0011] In addition, in the present invention, it is preferable that at least a portion of the magnetic member and the magnetic attraction member are disposed between the upper and lower ends of the handle in the vertical direction, so that when a user pulls the handle toward themselves to open the door, the force of the user to separate the magnetic member and the magnetic attraction member can be easily transmitted.

[0012] In addition, in the present invention, it is preferable that the vertical frame has a first portion disposed within the wall and a second portion that is longer than the first portion in the vertical direction and covers the edge of the opening, and that the second portion is shorter than the first portion in a horizontal direction perpendicular to the vertical direction. This makes it possible to reduce the protrusion of the vertical frame. [Effects of the Invention]

[0013] According to the hinged door fitting structure of the present invention, when the hinged door is closed, the step between the surface of the hinged door and the first wall surface is small. In addition, the hinges do not protrude beyond the surface of the hinged door. The handles protrude only slightly from the surface of the hinged door. As a result, when the hinged door is closed, it is possible to reduce the step between the surface of the hinged door and the first wall surface while suppressing protrusion from the first wall surface. As a result, the step between the first wall surface and the surface of the hinged door is small, making it difficult for dust to accumulate. Even if dust does accumulate, it can be easily removed. In addition, the surface of the vertical frame is generally positioned at a position that protrudes slightly from the first wall surface beyond the surface of the baseboard provided on the first wall surface. In addition, the magnetic member and the attraction member keep the hinged door in a closed state. This means that there is no need to provide a latch receiving portion on the other vertical frame. Therefore, even if the vertical frame is made smaller, it is possible to bring the surface of the hinged door closer to the first wall so that the distance between the surface of the hinged door and the first wall is smaller than the distance between the surface of the vertical frame and the first wall. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a front view of a hinged door structure according to one embodiment of the present invention; FIG. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II shown in FIG. [Figure 3] FIG. 3 is an exploded perspective view of the door stop body and the magnet member shown in FIG. 2. [Figure 4] 3 is a diagram showing the state in which the surface material of the door stop shown in FIG. 2 is unfolded. FIG. [Figure 5] FIG. 3 is a left side view of the core shown in FIG. 2. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI shown in FIG. 5. DETAILED DESCRIPTION OF THE INVENTION

[0015] A hinged door fitting structure according to one embodiment of the present invention will be described below with reference to the drawings. Fig. 1 is a view of the hinged door fitting structure according to one embodiment of the present invention as seen from the front (front). Fig. 2 is a cross-sectional view taken along line II-II shown in Fig. 1. The following description will be based on the front-to-back direction, which is a horizontal direction shown in Fig. 1; the left-to-right direction, which is perpendicular to the front-to-back direction and is viewed from the front (near side in Fig. 1); and the up-to-down direction, which is perpendicular to the front-to-back direction and the left-to-right direction. For ease of explanation, the directions shown in Fig. 1 will also be used as the basis in other drawings. The front-to-back direction corresponds to the "vertical direction" of the present invention, and the left-to-right direction corresponds to the "lateral direction" of the present invention.

[0016] As shown in FIGS. 1 and 2, the hinged door fitting structure 100 of this embodiment includes a hinged door 1 disposed in an opening 110 formed in a wall W, a frame 20 attached to the opening 110, and two magnet members M1 and M2. As shown in FIG. 2, the opening 110 penetrates the wall W in the front-to-rear direction and opens to a first wall surface WA and a second wall surface WB. The opening 110 has a rectangular shape that is elongated in the vertical direction. The wall W has a plurality of studs W1 and a plurality of gypsum boards W2 and W3 arranged on either side of the studs W1 in the front-to-rear direction. Wallpaper is pasted on the front surface of the gypsum board W2 and the rear surface of the gypsum board W3. The gypsum board W2 constitutes the first wall surface WA in the front of the wall W. The gypsum board W3 constitutes the second wall surface WB in the rear of the wall W. The first wall surface WA is the wall surface on the opening direction (front) of the hinged door 1.

[0017] As shown in FIG. 1 , the frame body 20 has two vertical frames 21, 22 that are long in the up-down direction and a horizontal frame 23 that is long in the left-right direction. The vertical frame 21 is arranged along the left edge of the opening 110. The vertical frame 22 is arranged along the right edge of the opening 110. The two vertical frames 21, 22 are arranged spaced apart from each other in the left-right direction. The horizontal frame 23 is arranged along the upper edge of the opening 110 and connects the upper ends of the two vertical frames 21, 22. In this embodiment, the vertical frame 22 corresponds to "one of the vertical frames" and the vertical frame 21 corresponds to "the other vertical frame" of the present invention.

[0018] As shown in FIG. 2, the two vertical frames 21, 22 have first portions 21A, 22A disposed within the wall W and second portions 21B, 22B covering the edges of the opening 110. The second portions 21B, 22B are longer than the first portions 21A, 22A in the front-to-rear direction. Furthermore, the left-to-right length L2 of the second portions 21B, 22B is shorter than the left-to-right length L1 of the first portions 21A, 22A. The front-to-rear ends of the second portions 21B, 22B form visible portions. The front surfaces 21B1, 22B1 of the second portions 21B, 22B protrude forward beyond the first wall surface WA of the wall W. The amount of protrusion of the surfaces 21B1, 22B1 from the first wall surface WA is equal to or slightly greater than the thickness of the baseboard disposed at the lower end of the first wall surface WA.

[0019] As shown in Figure 2, a door stop 31 is attached to the vertical frame 21. The door stop 31 faces the door tip of the back surface 1B of the hinged door 1 when the hinged door 1 closes the opening 110. The door stop 31 extends vertically. The door stop 31 has a door stop main body 31A and a surface material 31B that covers the surface of the door stop main body 31A and forms the surface of the door stop 31.

[0020] As shown in FIG. 3, the door stop body 31A has a recess 31A1. The recess 31A1 is located midway up and down on the door stop body 31A. The recess 31A1 opens forward and to the right. The recess 31A1 is large enough to accommodate the magnet member M1. As shown in FIG. 4, the face material 31B has a plate-shaped base material 31B1 and a sheet 31B2 attached to one side of the base material 31B1. The face material 31B also has four V-shaped grooves 31B3. The base material 31B1 in this embodiment is made of MDF (Medium Density Fiberboard). However, it may also be made of wood-based surface materials such as LVL (Laminated Veneer Lumber), laminated lumber, plywood, PB (Particle Board), CLT (Cross Laminated Timber), PSL (Parallel Strand Lumber), OSB (Oriented Strand Board), and solid wood.

[0021] The door stop 31 is constructed by folding and attaching such a surface material 31B to the door stop main body 31A, which has the magnet member M1 housed in the recess 31A1, at the V-groove 31B3. In other words, the magnet member M1 is covered by the surface material 31B and built into the door stop 31. In this embodiment, the magnet member M1 corresponds to the "attraction member" of the present invention.

[0022] As shown in FIG. 2, a door stop 32 is attached to the vertical frame 22, facing the hanging portion of the back surface 1B of the hinged door 1 when the hinged door 1 closes the opening 110. The door stop 32 also extends vertically. The door stop 32 has a door stop main body 32A and a face material 32B that covers the surface of the door stop main body 32A and forms the surface of the door stop 32. The face material 32B also has a plate-shaped base material similar to the above-mentioned base material 31B1, a sheet attached to one side of the base material, and four V-grooves. The door stop 32 is formed by folding this face material 32B at the V-grooves and attaching it to the door stop main body 32A.

[0023] In addition, a door stop (not shown) that faces the upper end of the rear surface 1B of the hinged door 1 when the hinged door 1 closes the opening 110 is also attached to the horizontal frame 23.

[0024] As shown in Figures 1 and 2, the hinged door 1 is attached to a vertical frame 22 with a hinge 9 and is rotatable around the hinge 9. That is, the hinged door 1 in this embodiment is a right-swinging door 1. The hinged door 1 is configured to be able to selectively assume a state in which the opening 110 is closed (the state shown in Figures 1 and 2) and a state in which the opening 110 is open. The hinged door 1 has a rectangular shape that is slightly smaller than the opening 110 and is elongated in the vertical direction. The hinge 9 is a known hidden hinge, and as shown in Figure 2, is arranged so as not to be exposed on the front surface 1A side of the hinged door 1 when the hinged door 1 is in a state in which the opening 110 is closed.

[0025] The hinged door 1 has a door body 2 and two face materials 3 and 4. The door body 2 has a core material 2A arranged at the door tip. As shown in FIG. 5, the core material 2A is a rod-shaped member that is long in the vertical direction. The core material 2A has two recesses 2A1 and 2A2. The recess 2A1 is arranged at a vertical midpoint of the core material 2A. The recess 2A1 is arranged at a position that overlaps with the recess 31A1 in the front-to-rear direction when the hinged door 1 closes the opening 110. The recesses 2A1 and 31A1 in this embodiment have the same shape and size, and are arranged at the same height so that they entirely overlap in the front-to-rear direction when the hinged door 1 closes the opening 110. Note that the recesses 2A1 and 31A1 may be different in shape and size.

[0026] The recess 2A1 is open toward the rear and left as shown in Figures 5 and 6. The size of the recess 2A1 is large enough to accommodate the magnet member M2.

[0027] The recess 2A2 is open to the left side surface of the core 2A. The recess 2A2 is located in the center of the core 2A in the front-rear direction. The recess 2A2 extends over the entire length of the core 2A in the up-down direction.

[0028] The face materials 3 and 4 have a plate-shaped base material similar to the base material 31B1 described above and a sheet attached to one side of the base material. The face materials 3 and 4 also have a plurality of V-shaped grooves. The face material 3 forms the front surface 1A of the hinged door 1. The face material 4 forms the back surface 1B of the hinged door 1.

[0029] The hinged door 1 is constructed by folding and attaching such face materials 3 and 4 to the door body 2 including the core material 2A in which the magnetic member M2 is housed in the recess 2A2, using the V-groove. In other words, as shown in FIG. 2, the magnetic member M2 is covered by the face material 4 and built into the hinged door 1. Because the core material 2A has the recess 2A2, the tips of the face materials 3 and 4 can be housed in the recess 2A2. Therefore, the tips of the face materials 3 and 4 do not butt against each other, and gaps are less likely to occur between them.

[0030] The hinged door 1 has a first pull tab 7A and a second pull tab 7B. The first pull tab 7A is embedded in the front surface 1A. The second pull tab 7B is embedded in the back surface 1B. The first pull tab 7A and the second pull tab 7B are well-known pull tabs and are the same component. The first pull tab 7A corresponds to the "pull tab" of the present invention.

[0031] The first pull tab 7A and the second pull tab 7B are arranged at the same height so that they are completely overlapped in the front-to-back direction. The first pull tab 7A is arranged at a position where the recesses 2A1 and 31A1 are located between the upper and lower ends in the vertical direction. In other words, the two magnet members M1 and M2 are arranged between the upper and lower ends of the first pull tab 7A in the vertical direction.

[0032] Since magnet member M1 and magnet member M2 have the same configuration, only magnet member M1 will be described. As shown in Fig. 3, magnet member M1 has a rectangular parallelepiped shape that is elongated in the vertical direction. Magnet member M1 has a permanent magnet 5 and two yokes 6. The yokes 6 are made of iron or steel.

[0033] The magnet member M1 is accommodated in the recess 31A1 with its longitudinal direction parallel to the vertical direction, as shown by the two-dot chain line in FIG. 3, and is fixed to the door stop body 31A via double-sided tape. The magnet member M1 is arranged, for example, so that the left yoke 6 is the north pole and the right yoke 6 is the south pole. In this case, the magnet member M2 is accommodated in the recess 2A1 with its longitudinal direction parallel to the vertical direction, and is fixed to the core material 2A via double-sided tape. In this case, the magnet member M2 is arranged so that the left yoke 6 is the south pole and the right yoke 6 is the north pole. In this way, the two magnet members M1 and M2 are attracted to each other via the surface members 4 and 31B by their mutual magnetic forces when the hinged door 1 closes the opening 110. In other words, the two magnet members M1 and M2 maintain the hinged door 1 in a state where the opening 110 is closed. Furthermore, the desired attractive force can be easily obtained without increasing the magnetic force of each magnet member M1 and M2. The magnet members M1 and M2 may be fixed to the recesses 31A1 and 2A1 with a member other than the double-sided tape (for example, an adhesive).

[0034] Next, we will explain the positional relationship in the front-to-rear direction between the surface 1A of the hinged door 1, the first wall surface WA, and the surfaces 21B1, 22B1 of the vertical frames 21, 22. As shown in Fig. 2, in the fitting structure 100 for the hinged door 1, when the hinged door 1 closes the opening 110, the separation distance T1 between the surface 1A of the hinged door 1 and the first wall surface WA in the front-to-rear direction is smaller than the separation distance T2 between the surfaces 21B1, 22B1 of the vertical frames 21, 22 and the first wall surface WA in the front-to-rear direction.

[0035] Further, the surface 1A of the hinged door 1 is located between the first wall surface WA and the surfaces 21B1 and 22B1 of the vertical frames 21 and 22 when the hinged door 1 closes the opening 110.

[0036] As described above, according to the fitting structure 100 of the hinged door 1 of this embodiment, when the hinged door 1 closes the opening 110, the step D1 between the surface 1A of the hinged door 1 and the first wall surface WA is small. Furthermore, the hinge 9 does not protrude outward (forward) from the surface 1A of the hinged door 1. The first pull tab 7A protrudes only slightly from the surface 1A of the hinged door 1. As shown in FIG. 2, the first pull tab 7A in this embodiment only protrudes slightly from the surface 1A. As a result, when the hinged door 1 closes the opening 110, it is possible to reduce the step D1 between the surface 1A of the hinged door 1 and the first wall surface WA while suppressing protrusion from the first wall surface WA. Therefore, the step D1 between the first wall surface WA and the surface 1A of the hinged door 1 is small, making it difficult for dust and the like to accumulate. Even if dust does accumulate, it can be easily removed. Furthermore, since the step D1 is small, the fitting structure 100 of the hinged door 1 has a nearly flat appearance when viewed from the front, giving the fitting structure 100 of the hinged door 1 a refined and beautiful appearance.

[0037] Furthermore, the two magnet members M1 and M2 maintain the hinged door 1 in a state in which the opening 110 is closed. In other words, there is no need to provide a latch receiving portion on the vertical frame 21, and there is no need to ensure a thickness in the left-right direction for providing the latch receiving portion on the vertical frame 21. This allows the height of the vertical frames 21 and 22 to be reduced. Even if the height is reduced, there is no need to provide a latch receiving portion on the vertical frame 21, so the latch receiving portion does not interfere with the gypsum board W2. As a result, even if the height of the vertical frame 21 is reduced, it is possible to bring the height of the hinged door 1 closer to the first wall surface WA so that the separation distance T1 between the height of the vertical frame 21 and the first wall surface WA is smaller than the separation distance T2 between the height of the vertical frames 21 and 22 and the first wall surface WA.

[0038] Furthermore, when the hinged door 1 closes the opening 110, the surface 1A of the hinged door 1 is located between the first wall surface WA and the surfaces 21B1, 22B1 of the vertical frames 21, 22. This reduces the distance in the front-to-rear direction between the surface 1A of the hinged door 1 and the surfaces 21B1, 22B1 of the vertical frames 21, 22. Therefore, when the hinged door 1 closes the opening 110, the step D2 between the surface 1A of the hinged door 1 and the surfaces 21B1, 22B1 of the vertical frames 21, 22 is reduced. Furthermore, because the step D2 is small, the fitting structure 100 of the hinged door 1 has an even more beautiful appearance when viewed from the front.

[0039] Moreover, the magnet member M1 is covered by the surface material 4 and is built into the hinged door 1. The magnet member M2 is covered by the surface material 31B and is built into the door stop 31. As a result, when the hinged door 1 opens the opening 110, the two magnet members M1 and M2 are not exposed to the outside.

[0040] Furthermore, the two magnet members M1 and M2 are disposed between the upper and lower ends of the first pull tab 7A in the vertical direction, which makes it easier for the user's force to separate the magnet members M1 and M2 when the user pulls the first pull tab toward him (forward) to open the hinged door 1.

[0041] Furthermore, the length L2 in the left-right direction of the second portions 21B, 22B of the vertical frames 21, 22 is smaller than the length L1 in the left-right direction of the first portions 21A, 22A. This makes it possible to reduce the visibility of the vertical frames 21, 22.

[0042] The above describes the preferred embodiment of the present invention, but the present invention is not limited to the above embodiment and various modifications are possible within the scope of the utility model registration claims.

[0043] One of the two magnet members M1, M2 may be an attracting member that can be attracted to the other magnet member by the magnetic force of the other magnet member. A magnetic material such as iron may be used as the attracting member. Furthermore, at least one of the two magnet members M1, M2 may be exposed to the outside without being covered by a covering material such as a face material.

[0044] The two magnet members M1 and M2 may be arranged so as to be partially offset from the range between the upper and lower ends of the first pull-tab 7A in the vertical direction. Also, the two magnet members M1 and M2 may be arranged outside the range between the upper and lower ends of the first pull-tab 7A in the vertical direction.

[0045] The second pull tab 7B does not have to be provided. Also, if the separation distance T1 is smaller than the separation distance T2, the surface 1A of the hinged door 1 may be located between the first wall surface WA and the second wall surface WB when the hinged door 1 closes the opening 110. Also, the surface 1A of the hinged door 1 may be located at the same position in the front-to-rear direction as the first wall surface WA when the hinged door 1 closes the opening 110. Also, the surfaces 21B1 and 22B1 of the vertical frames 21 and 22 may be located at the same position in the front-to-rear direction as the first wall surface WA.

[0046] The vertical frames 21, 22 may be composed of only the second portions. Also, the length L2 in the left-right direction of the second portions 21B, 22B may be equal to or greater than the length L1 in the left-right direction of the first portions 21A, 22A.

[0047] The hinged door 1 may be a left-hinged door. In this case, the left and right positions of the components of the fitting structure 100 of the hinged door 1 may be interchanged. [Explanation of symbols]

[0048] 1 Swing door 1A, 21B1, 22B1 surface 1B Back side 2 Doors 2A Core Material 2A1, 2A2, 31A1 recess 3, 4, 31B, 32B surface material 5. Permanent magnets 6 York 7A 1st pull 7B 2nd Pull 9 hinges 20 Frame 21,22 Vertical frame 21A,22A 1st part 21B,22B 2nd part 23 Horizontal frame 31, 32 per unit 31A, 32A door stop body 31B1 Base material 31B2 sheet 31B3 V groove 100 Door and window construction 110 Opening L1, L2 length M1, M2 magnet components T1,T2 separation distance W wall W1 stud W2, W3 gypsum board WA No. 1 wall WB 2nd wall

Claims

1. Two vertical frames attached to the wall opening, a hinged door attached to one of the two vertical frames by a hinge and rotatable about the hinge; A door stop attached to the other vertical frame and facing the door tip portion on the back surface of the hinged door when the hinged door closes the opening; a magnet member disposed on one of the hinged door and the door stop; an attraction member that is arranged on the other of the hinged door and the door stop, and that can be attracted to the magnet member by the magnetic force of the magnet member when the hinged door is in a state where the opening is closed; The hinged door has a handle embedded in the surface, The hinge is arranged so as not to be exposed on the front surface side of the hinged door when the hinged door closes the opening, A hinged door fitting structure characterized in that, when the hinged door is in a state where the opening is closed, the distance between the surface of the hinged door and the first wall surface in a direction perpendicular to the first wall surface of the wall is smaller than the distance between the surface of the vertical frame and the first wall surface in the perpendicular direction.

2. The hinged door fitting structure according to claim 1, characterized in that the surface of the hinged door is located between the first wall surface and the surface of the vertical frame when the hinged door is in a state where the hinged door closes the opening.

3. The magnet member is built into the hinged door and is covered by a surface material that forms the back surface of the hinged door, 2. The hinged door structure according to claim 1, wherein the attracting member is a magnetic member built into the door stop and is covered by a surface material that constitutes the surface of the door stop.

4. 2. The hinged door structure according to claim 1, wherein at least a portion of the magnet member and the attraction member are disposed between the upper and lower ends of the handle in the vertical direction.

5. The vertical frame has a first portion disposed within the wall and a second portion that is longer than the first portion in the vertical direction and covers an edge of the opening, The hinged door structure according to claim 1, wherein the second portion has a length smaller than that of the first portion in a horizontal direction perpendicular to the vertical direction.

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