hinge
The hinge design with an internal rotation center and overhang portion addresses the issue of moisture leakage by sealing gaps between hinge members, ensuring effective sealing regardless of door direction, thus preventing moisture ingress.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- SUGATSUNE IND CO LTD
- Filing Date
- 2022-10-17
- Publication Date
- 2026-06-29
AI Technical Summary
Existing hinges for glass doors in bathrooms and shower booths allow moisture to leak through gaps between the movable and fixed members due to the protruding portion being pressed against the fixing member, causing deformation and increased gaps, especially when the door opens slightly or both inward and outward.
The hinge design features a rotation center inside the door with an overhang portion positioned between the front and rear lines of the door, effectively closing the gaps between the movable and fixed members, and optionally between the movable member and the main body, using protruding portions that can be integrated with or separate from the cover or clamping bodies.
The design effectively seals gaps, preventing moisture leakage by ensuring the protruding portion remains functional even with door openings, maintaining a sealed interface regardless of the direction of door movement.
Smart Images

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Abstract
Description
Technical Field
[0006] , , , , ,
[0001] The present invention relates to a hinge used for doors of bathrooms, shower booths, etc.
Background Art
[0002] For doors of bathrooms, shower booths, etc., glass doors may be used to create an open space. As a hinge for opening and closing a glass door, a hinge including a fixed member attached to a main body such as a frame or a glass wall and a movable member attached to the glass door is known (see Patent Document 1). The movable member has a first clamping body and a second clamping body that sandwich the glass door back and forth.
[0003] In the case of a glass door in a bathroom, shower booth, etc., moisture inside the bathroom may leak to the outside. For example, by attaching an edge seal having a U-shaped cross section around the door, the gap around the door can be blocked. However, since the movable member of the hinge gets in the way, the edge seal cannot be extended to the portion of the movable member of the hinge. Therefore, a gap occurs between the movable member and the fixed member of the hinge, and moisture leaks to the outside through this gap.
[0004] To solve this problem, Patent Document 1 discloses providing an overhanging portion that protrudes toward the fixed member on a packing interposed between the first clamping body and the door or a packing interposed between the second clamping body and the door, and blocking the gap between the movable member and the fixed member of the hinge by the overhanging portion of the packing.
Prior Art Documents
Patent Documents
[0005]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0007] The present invention has been made in view of the above problems, and aims to provide a hinge that can effectively close the gap between the movable member and the fixed member of the hinge and / or the gap between the movable member of the hinge and the main body such as a frame or glass wall. [Means for solving the problem]
[0008] To solve the above problems, one aspect of the present invention is a hinge comprising a fixed member attached to a main body and a movable member attached to a door and rotatable about an axis, wherein the movable member has a first clamping body and a second clamping body that clamp the door front to back, the rotation center of the door is located inside the door in a plan view, and at least one of the movable member or the fixed member is provided with an overhang portion which is positioned between the front line and the rear line of the door, and the overhang portion is a hinge that closes the gap between the movable member and the fixed member and / or the gap between the movable member and the main body. [Effects of the Invention]
[0009] According to one aspect of the present invention, in a plan view, the rotation center of the door is located inside the door, and a protruding portion is provided between the front line and the rear line of the door. As a result, the protruding portion can effectively close the gap between the movable member and the fixed member of the hinge and / or the gap between the movable member and the main body of the hinge. [Brief explanation of the drawing]
[0010] [Figure 1]This is a perspective view showing an entrance to a bathroom, shower booth, etc., in which the hinge of the first embodiment of the present invention is used. [Figure 2] Figure 2(a) is a front perspective view of the hinge of this embodiment, and Figure 2(b) is a rear perspective view of the hinge of this embodiment. [Figure 3] This is an exploded perspective view of the hinge of this embodiment. [Figure 4] These are detailed diagrams of the hinge of this embodiment (Figure 4(a) is a cross-sectional view along line AA in Figure 4(c), Figure 4(b) is a plan view, and Figure 4(c) is a front view). [Figure 5] This is a diagram illustrating the operation of the hinge in this embodiment. [Figure 6] Figure 6(a) is a front perspective view of the hinge according to the second embodiment of the present invention, and Figure 6(b) is a rear perspective view of the hinge according to the second embodiment of the present invention. [Figure 7] Figure 7(a) is a rear perspective view of the hinge according to the third embodiment of the present invention (showing the door in the closed position), and Figure 7(b) is a rear perspective view of the hinge according to the third embodiment of the present invention (showing the door in the open position). [Figure 8] This is a cross-sectional view taken along line VIII-VIII in Figure 7(a). [Figure 9] This is an exploded perspective view of a hinge according to a third embodiment of the present invention. [Figure 10] This is a perspective view of a hinge according to the fourth embodiment of the present invention. [Figure 11] Figure 11(a) is a plan view of the protruding section, and Figure 11(b) is a plan view of the hinge. [Figure 12] This is a perspective view of a hinge according to a fifth embodiment of the present invention. [Figure 13] Figure 13(a) is a plan view of the protruding section, and Figure 13(b) is a plan view of the hinge. [Modes for carrying out the invention]
[0011] Hereinafter, based on the attached drawings, the hinge of the embodiment of the present invention will be described in detail. However, the hinge of the present invention can be embodied in various forms and is not limited to the embodiments described in this specification. This embodiment is provided with the intention of enabling those skilled in the art to fully understand the invention by sufficiently disclosing the specification. (First Embodiment)
[0012] FIG. 1 shows an entrance / exit such as a bathroom or a shower booth. 1 is the hinge of the first embodiment of the present invention, 2 is a main body such as a frame, and 3 is a glass door.
[0013] The hinge 1 includes a fixed member 4 attached to the main body 2 and a movable member 5 attached to the door 3. The movable member 5 is rotatable about a shaft 6 (see FIG. 3). The hinge 1 is configured to be able to open the door 3 inward or outward. The door 3 may be configured to be able to open both inward and outward, or may be configured to be able to open only in one direction by a door stop or the like.
[0014] In the following, for the convenience of explanation, the configuration of the hinge 1 will be described using the directions when the door 3 in the closed position is viewed from the front from the indoor side of a bathroom or the like, that is, the front-back, left-right, and up-down directions in FIG. 1.
[0015] FIG. 2(a) shows a front-side perspective view of the hinge 1, and FIG. 2(b) shows a back-side perspective view of the hinge 1. 4 is the fixed member, 5 is the movable member, and 3 is a part of the door.
[0016] The fixed member 4 includes a plate-shaped base portion 4a attached to the main body 2, a bifurcated shaft support portion 4b provided protruding from the center in the front-back direction of the base portion 4a, and a shaft support portion 4c disposed between the shaft support portions 4b. The shaft 6 (see FIG. 3) is supported by the shaft support portions 4b and 4c. The shaft support portions 4b and 4c may be formed in an integral block shape.
[0017] The movable member 5 comprises a first clamping body 7 and a second clamping body 8 that clamp the door 3 from the front and back. The first clamping body 7 and the second clamping body 8 are connected by a screw 9. By tightening the screw 9 with the door 3 clamped, the door 3 is fixed to the first clamping body 7 and the second clamping body 8.
[0018] Figure 3 is an exploded perspective view of hinge 1. Figure 4 is a detailed view of hinge 1. Figure 4(a) is a cross-sectional view along line AA in Figure 4(c), Figure 4(b) is a plan view, and Figure 4(c) is a front view.
[0019] In Figure 3, 4 is the fixed member, 3 is the door, 7 is the first clamping body of the movable member 5, and 8 is the second clamping body of the movable member 5. Figure 3 shows the state in which the first clamping body 7 is connected to the fixed member 4 via the shaft 6.
[0020] The base portion 4a of the fixed member 4 has a recess 4d with a circular arc cross-section to avoid interference between the door 3 and the movable member 5. Two recesses 4d are formed above and below the shaft support portions 4b and 4c.
[0021] The movable member 5 comprises a first clamping body 7, a cover 10, a first packing 11, a second packing 14, a second clamping body 8, and an overhanging portion 12. The configuration of each part is described below.
[0022] The first clamping body 7 comprises a U-shaped plate portion 7a in a front view (see also the front view in Figure 4(c)) and a protrusion 7b formed integrally with the plate portion 7a and fitting into the notch 3a of the door 3. The protrusion 7b extends along the inner periphery of the U-shaped plate portion 7a. A shaft housing hole 7b1 for fixing the shaft 6 is formed in the protrusion 7b. The shaft 6 fits into the notch 3a of the door 3 together with the protrusion 7b. The door 3 is rotatable around the shaft 6. In a plan view, the rotation center C of the door 3 is located inside the door 3 (see Figure 5(a)). A screw hole 7b2 is formed in the protrusion 7b into which a screw 9 is screwed.
[0023] The first packing 11 is U-shaped and sheet-like. The first packing 11 extends along the outer edge of the protrusion 7b. The first packing 11 is interposed between the first clamping body 7 and the door 3.
[0024] Door 3 is a glass door. Door 3 has a notch 3a into which the protrusion 7b of the first clamping body 7 fits. The notch 3a is formed to be similar in shape to the outer shape of the protrusion 7b, and is also made larger than the outer shape of the protrusion 7b to allow for adjustment of the position of door 3.
[0025] The second packing 14 is U-shaped and sheet-like. The second packing 14 is interposed between the door 3 and the second clamping body 8. The second packing 14 is formed to be the same shape as the first packing 11.
[0026] The second clamping body 8 is formed in a U-shape and plate-like manner. The second clamping body 8 has a through hole 8a through which the screw 9 passes.
[0027] The cover 10 is formed in a U-shape. Each side of the cover 10 is formed in an L-shape in cross-section so that it can cover the side and top surfaces of the outer edge of the protrusion 7b. The cover 10 is made of resin. The cover 10 prevents the metal protrusion 7b from coming into contact with the edge of the notch 3a of the glass door 3. The cover 10 has through holes 10a for the screws 9.
[0028] The protruding portion 12 is provided on the movable member 5 side. In this embodiment, the protruding portion 12 is integrally formed with the cover 10 and is separate from the first clamping body 7 and the second clamping body 8 of the movable member 5. The protruding portion 12 may be bonded to the cover 10 or attached to the cover 10 using screws or the like. The protruding portion 12 has a circular arc cross-section and extends in the vertical direction. As shown in Figure 4(b), at least a part of the protruding portion 12 is positioned between the front line L1 (the line on the front of the door 3) and the rear line L2 (the line on the rear of the door 3). The protruding portion 12 closes the gap g that occurs between the door 3 and the fixing member 4. The protruding portion 12 may be in contact with the fixing member 4 or may be separated from the fixing member 4 as shown in Figure 4(b) (i.e., a gap may exist between the fixing member 4 and the protruding portion 12).
[0029] As shown in Figure 4(a), in the horizontal cross-section, the outer surface of the protruding portion 12 is formed symmetrically, and protrudes most towards the fixing member 4 at the center of the door 3 in the front-to-back direction. As shown in Figure 4(b), the protruding portion 12 has a recess 13 (see also Figure 3) into which the door 3 fits, allowing the position of the door 3 to be adjusted to the left in Figure 4. Also, as shown in Figure 3, the protruding portion 12 has a drainage hole 12a that penetrates vertically through the connection portion with the cover 10.
[0030] When assembling hinge 1, the cover 10 is fitted onto the protrusion 7b of the first clamping body 7. Then, the notch 3a of the door 3 is fitted onto the protrusion 7b of the first clamping body 7, and the door 3 is clamped between the first clamping body 7 and the second clamping body 8, and the screw 9 is loosely tightened. After adjusting the position of the door 3, the screw 9 is fully tightened to firmly fix the door 3 to the first clamping body 7 and the second clamping body 8.
[0031] The operation and effects of hinge 1 of this embodiment will be described below.
[0032] Figure 5 shows door 3 in a plan view. Figure 5(a) shows door 3 in the closed position, Figure 5(b) shows door 3 90 degrees open when opening outwards, Figure 5(c) shows door 3 45 degrees open when opening outwards, Figure 5(d) shows door 3 90 degrees open when opening inwards, and Figure 5(e) shows door 3 45 degrees open when opening inwards.
[0033] As shown in Figure 5(a), in a plan view, the rotation center C of the door 3 is located inside the door 3. At least a portion of the overhang 12 is positioned between the front line L1 and the rear line L2 of the door 3. Therefore, whether the door 3 is opened 45 degrees inward or outward (see Figures 5(c) and 5(e)), the overhang 12 can effectively close the gap between the fixed member 4 and the movable member 5.
[0034] As shown in Figure 3, since the protruding portion 12 is provided on the cover 10 that covers the protrusion 7b of the first clamping body 7, the protruding portion 12 can be easily provided on the movable member 5.
[0035] As shown in Figure 4(a), in the horizontal cross-section, the outer surface of the protruding portion 12 is formed symmetrically, and it protrudes most towards the fixing member 4 at the center of the door 3 in the front-to-back direction, so that the gap g that occurs between the fixing member 4 and the movable member 5 of the hinge 1 can be effectively sealed.
[0036] As shown in Figure 3, since a recess 13 with a circular arc cross-section is formed in the fixing member 4, it is no longer necessary to form a notch in the end face 3b of the door 3 to avoid interference with the fixing member 4.
[0037] In the above embodiment, the protruding portion 12 closes the gap between the movable member 5 and the fixed member 4. However, the vertical length of the fixed member 4 may be shortened, and the protruding portion 12 may be used to close the gap between the movable member 5 and the main body 2 such as a frame. (Second Embodiment)
[0038] Figure 6 shows a perspective view of a hinge 21 according to a second embodiment of the present invention. Figure 6(a) is a front perspective view of the hinge 21, and Figure 6(b) is a rear perspective view of the hinge 21. 24 is a fixing member, 3 is a door, 7 is a first clamping body, 8 is a second clamping body, and 12 is an overhang. The configuration of the door 3, the first clamping body 7, the second clamping body 8, and the overhang 12 is the same as in the first embodiment, so the same reference numerals are used and their descriptions are omitted.
[0039] In the first embodiment, the fixing member 4 is attached to the frame which serves as the main body, whereas in the second embodiment, the fixing member 24 is attached to a glass wall (not shown) which serves as the main body. Specifically, the fixing member 24 comprises a first clamping body 22 and a second clamping body 23 that sandwich the glass wall from the front and back. A shaft support portion 25 is fixed to the fixing member 24. The shaft support portion 25 may be rotatably connected to the fixing member 24 via a shaft.
[0040] As in this embodiment, the main body 2 may be made from a glass wall, and the protruding portion 12 may be used to close the gap between the door 3 and the glass wall. (Third embodiment)
[0041] Figure 7 shows a rear perspective view of the hinge 31 according to the third embodiment of the present invention. Figure 7(a) shows the hinge 31 in the closed position, and Figure 7(b) shows the hinge 31 in the 90-degree open position. 32 is a fixed member, 35 is a movable member, and 36 is an overhang. In the first embodiment, the overhang 12 is provided on the cover 10, whereas in the third embodiment, the overhang 36 is attached to the first clamping body 33 and the second clamping body 34 of the movable member 35.
[0042] The hinge 31 of the third embodiment comprises a fixed member 32 attached to the main body and a movable member 35 attached to the door 3. The movable member 35 is rotatable around an axis (not shown).
[0043] The fixing member 32 comprises a plate-shaped base portion 32a and a shaft support portion 32b that protrudes from the center of the base portion 32a in the front-rear direction. The shaft support portion 32b is formed in a block shape. The base portion 32a has a recess 32c with an arc-shaped cross-section to avoid interference between the door 3 and the movable member 35.
[0044] The movable member 35 includes a first clamping body 33 and a second clamping body 34 that clamp the door 3 from the front and back. The first clamping body 33 and the second clamping body 34 are connected by a screw 37. By tightening the screw 37, the door 3 is fixed to the first clamping body 33 and the second clamping body 34.
[0045] As shown in the cross-sectional view of Figure 8, the first clamping body 33 comprises a U-shaped plate portion 33a (see also Figure 7) and a protrusion 33b (see also Figure 7) which is formed integrally with the plate portion 33a and fits into the notch 3a of the door 3. The protrusion 33b extends along the inner periphery of the U-shaped plate portion 33a. The second clamping body 34 is formed in a U-shape and plate-like manner (see also Figure 7).
[0046] A first packing 38 and a first segmented cover 39 are interposed between the door 3 and the first clamping body 33 (see also Figure 7(b)). A second packing 40 and a second segmented cover 44 are interposed between the door 3 and the second clamping body 34 (see also Figure 7(b)). The first segmented cover 39, which is attached to the first clamping body 33, covers the protrusion 33b of the first clamping body 33.
[0047] The protruding portion 36 is separate from the covers 39 and 44. At least a portion of the protruding portion 36 is positioned between the front line L1 and the rear line L2 of the door 3, closing the gap between the door 3 and the fixing member 32. The outer surface of the protruding portion 36 is formed symmetrically in a horizontal cross-section and protrudes most towards the fixing member 32 at the center of the door 3 in the front-rear direction. A triangular projection 36a is formed in the center of the protruding portion 36. This projection 36a contacts the recess 32c of the fixing member 32.
[0048] As shown in Figure 9, the first clamping body 33 and the second clamping body 34 each have guide grooves 33c and 34c into which the guide projections 36b at both ends of the protruding portion 36 are inserted. By inserting the guide projections 36b of the protruding portion 36 into the guide grooves 33c and 34c, the protruding portion 36 is attached to the first clamping body 33 and the second clamping body 34.
[0049] The hinge 31 of the third embodiment provides the same effects as the hinge 1 of the first embodiment, and since the protruding portion 36 is separate from the covers 39 and 44, for example, the covers 39 and 44 can be made of resin and the protruding portion 36 can be made of rubber, and the protruding portion 36 can be brought into contact with the fixing member 32. (Fourth Embodiment)
[0050] Figure 10 shows a perspective view of a hinge 41 according to a fourth embodiment of the present invention. Figure 11(a) shows a plan view of the protruding portion 42, and Figure 11(b) shows a plan view of the hinge 41.
[0051] As shown in Figure 10, the hinge 41 of the fourth embodiment, like the hinge 1 of the first embodiment, comprises a fixed member 4 and a movable member 5. The fixed member 4 comprises a base portion 4a and shaft support portions 4b and 4c. Since these components are the same as those of the first embodiment, they are given the same reference numerals and their descriptions are omitted.
[0052] As shown in Figure 11(b), the movable member 5 comprises a first clamping body 7, a first packing 11, a second packing 14, and a second clamping body 8. Since these components are the same as in the first embodiment, they are given the same reference numerals and their descriptions are omitted.
[0053] In the hinge 1 of the first embodiment, the protruding portion 12 is provided on the movable member 5 side, whereas in the hinge 41 of the fourth embodiment, the protruding portion 42 is provided on the fixed member 4 side.
[0054] The protruding portion 42 is separate from the fixing member 4. As shown in Figure 10, the base portion 4a of the fixing member 4 has a housing portion 43 into which the protruding portion 42 is fitted. As shown in Figure 11(b), the housing portion 43 includes, for example, a slit 43b formed vertically in the base portion 4a and a recess 43a formed on the back side of the base portion 4a so as to communicate with the slit 43b.
[0055] As shown in Figure 11(a), the protruding portion 42 comprises a plate-shaped base portion 42a and a substantially triangular projection portion 42b that protrudes from the base portion 42a. As shown in Figure 11(b), the base portion 42a is fitted into the recess 43a, and the constricted portion 42c at the base of the projection portion 42b is fitted into the slit 43b.
[0056] The protruding portion 42 is made of rubber or resin. The tip of the projection 42b of the protruding portion 42 contacts the end face of the door 3. The projection 42b of the protruding portion 42 is positioned between the front line L1 and the rear line L2 of the door 3. Even when the door 3 is opened and closed, the projection 42b of the protruding portion 42 bends, maintaining a state in which the tip of the projection 42b contacts the end face of the door 3. In the hinge 41 of this embodiment, the protruding portion 42 can effectively close the gap g between the movable member 5 and the fixed member 4.
[0057] Although Figure 10 shows an example in which the protruding portion 42 is provided above and below the shaft support portions 4b and 4c of the fixing member 4, the protruding portion 42 may be provided above or below either the shaft support portions 4b and 4c of the fixing member 4, and the protruding portion 12 of the first embodiment may be provided on the other side. (Fifth embodiment)
[0058] Figure 12 shows a perspective view of a hinge 51 according to a fifth embodiment of the present invention. Figure 13(a) shows a plan view of the protruding portion 52, and Figure 13(b) shows a plan view of the hinge 51.
[0059] As shown in Figure 12, the hinge 51 of the fifth embodiment, like the hinge 1 of the first embodiment, comprises a fixed member 4 and a movable member 5. The fixed member 4 comprises a base portion 4a and shaft support portions 4b and 4c. Since these components are the same as those of the first embodiment, they are given the same reference numerals and their descriptions are omitted.
[0060] As shown in Figure 13(b), the movable member 5 comprises a first clamping body 7, a first packing 11, a second packing 14, and a second clamping body 8. Since these components are the same as in the first embodiment, they are given the same reference numerals and their descriptions are omitted.
[0061] In the hinge 1 of the first embodiment, the protruding portion 12 is provided on the movable member 5 side, whereas in the hinge 51 of the fifth embodiment, the protruding portion 52 is provided on the fixed member 4 side, similar to the hinge 41 of the fourth embodiment.
[0062] The protruding portion 52 is separate from the fixing member 4. As shown in Figure 12, the base portion 4a of the fixing member 4 has a housing portion 53 into which the protruding portion 52 is fitted. As shown in Figure 13(b), the housing portion 53 includes, for example, a slit 53b formed vertically in the base portion 4a and a recess 53a formed on the back side of the base portion 4a so as to communicate with the slit 53b.
[0063] As shown in Figure 13(a), the protruding portion 52 comprises a plate-shaped base portion 52a and a substantially arc-shaped projection portion 52b that protrudes from the base portion 52a. As shown in Figure 13(b), the base portion 52a is fitted into the recess 53a, and the constricted portion 52c at the base of the projection portion 52b is fitted into the slit 53b.
[0064] The protruding portion 52 is made of rubber, resin, or metal. At least a portion of the projection 52b of the protruding portion 52 is positioned between the front line L1 and the rear line L2 of the door 3. In the hinge 51 of this embodiment, the protruding portion 52 can effectively close the gap g between the movable member 5 and the fixed member 4. Furthermore, since the projection 52b of the protruding portion 52 is formed in an arc shape, interference between the protruding portion 52 and the movable member 5 can be prevented even when the door 3 is opened and closed.
[0065] Although Figure 12 shows an example in which the protruding portion 52 is provided above and below the shaft support portions 4b and 4c of the fixing member 4, the protruding portion 52 may be provided above or below either the shaft support portions 4b and 4c of the fixing member 4, and the protruding portion 12 of the first embodiment may be provided on the other.
[0066] The hinge of the present invention is not limited to being embodied in the above-described embodiment, and can be embodied in other embodiments without altering the spirit of the invention.
[0067] For example, the above embodiment described an example of applying hinges to a bathroom or shower booth, but hinges can also be applied to, for example, a door that separates the interior and exterior of a building.
[0068] Furthermore, although the door is made of glass in the above embodiment, the door is not limited to being made of glass, but may be made of resin, wood, or metal. [Explanation of symbols]
[0069] 1…Hinge 2…Main unit 3... Door 4… Fixing member 4D... indentation 5…Movable parts 6…axis 7...First clamping body 7b... protruding part 8...Second clamping body 10…cover 12...Protrusion 21…Hinge 22...first clamping body 23...Second clamping body 24… Fixing member 31…Hinge 32… Fixing member 32c... indentation 33...first clamping body 33b... protruding part 34...Second clamping body 35…Movable parts 36…Protrusion 41…Hinge 42...Protrusion 51…Hinge 52...Protruding part C... Center of rotation of the door L1…Front line of the door L2… Rear line of the door
Claims
1. A fixing member that is attached to the main body, It includes a movable member that is attached to the door and can rotate around an axis, The movable member has a first clamping body and a second clamping body that clamp the door from the front and back, In a plan view, the center of rotation of the door is located inside the door. At least one of the movable member or the fixed member is provided with an overhang portion which is positioned between the front line and the rear line of the door, The protruding portion acts as a hinge that closes the gap between the movable member and the fixed member and / or the gap between the movable member and the main body.
2. The first clamping body has a protrusion that fits into a notch formed in the door, At least a portion of the protrusion is covered by a cover that prevents the protrusion from coming into contact with the edge of the notch of the door. The hinge according to claim 1, characterized in that the protruding portion is provided on the cover.
3. The hinge according to claim 1, characterized in that the protruding portion is attached to the first clamping body and the second clamping body.
4. The hinge according to any one of claims 1 to 3, characterized in that the outer surface of the protruding portion is formed symmetrically in a horizontal cross-section and protrudes most towards the fixing member at the center of the door in the front-rear direction.
5. The hinge according to any one of claims 1 to 3, characterized in that the fixing member has a recess with a circular arc cross-section to avoid interference with the door and the movable member.