Soundproof door

Abstract

To provide a soundproof door which can be easily opened without reducing soundproofness.SOLUTION: A frame body 11 includes a pair of vertical frames 21, and a horizontal frame 22 for connecting the upper ends of the vertical frames 21. A door step 12 includes vertical materials 25 respectively fixed to the vertical frames 21, and a horizontal material 26 fixed to the horizontal frame 22. A magnet packing 16 includes first and second vertical parts 31 and 32 respectively fixed to the vertical materials 25, and a horizontal part 33 fixed to the horizontal material 26. The first vertical part 31 is closer to a door knob 14 than the second vertical part 32. A magnetic force of a magnet 17 in the first vertical part 31 is smaller than that of a magnet 17 in the second vertical part 32 and that of a magnet 17 in the horizontal part 33.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a soundproof door that can be easily opened.

Background Art

[0002] In the soundproof door described in Patent Document 1, a magnet packing is attached to the doorstop, and a magnetic sheet is attached to the door panel. When the door panel is closed, the magnetic sheet adheres to the magnet packing, preventing sound leakage between the door panel and the doorstop.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, the position and angle of the door with respect to the doorstop are adjusted when the door used in a house or the like is assembled with hinges or the like. In order to facilitate the opening and closing of the door, there is usually a certain gap between the door and the doorstop. In such a door, in order to prevent sound leakage, it is conceivable to adopt a magnet packing and a magnetic sheet as described in Patent Document 1.

[0005] In order to enhance the effect of preventing sound leakage, it is conceivable to increase the magnetic attraction force between the magnet packing and the magnetic sheet, that is, to strengthen the magnetic force of the magnet of the magnet packing. However, if the magnetic attraction force between the magnet packing and the magnetic sheet is increased, a large force is also required to open the door. As a result, it is conceivable that the soundproof door becomes difficult to open and the usability deteriorates.

[0006] On the one hand, if the magnetic attraction between the magnet packing and the magnetic sheet is reduced, the door can be easily opened. However, if the magnetic attraction is small, it is conceivable that the magnet packing does not magnetically adhere to the magnetic sheet so as to close the gap between the door and the door stop, and a gap is generated between the door and the door stop, and the sound leakage prevention effect cannot be sufficiently exhibited.

[0007] The present invention has been made in view of the above problems, and an object thereof is to provide a soundproof door that can be easily opened without reducing soundproof performance.

Means for Solving the Problems

[0008] (1) The soundproof door according to the present invention includes a frame body located at an opening of a wall of a house, a door stop fixed to the frame body, a non-magnetic door body that opens or closes the inside of the frame body, a doorknob fixed to the door body, and in the door stop, a magnet packing fixed to a contact surface facing the closed door body and having a magnet in an internal space, and in the door body, a magnetic sheet fixed around a surface facing the door stop in a closed state. The frame body has a pair of vertical frames and a horizontal frame connecting the upper ends of the vertical frames. The door stop has vertical members respectively fixed to the pair of vertical frames and a horizontal member fixed to the horizontal frame. The magnet packing has a first vertical portion and a second vertical portion respectively fixed to the vertical members and a horizontal portion fixed to the horizontal member. The first vertical portion is closer to the doorknob than the second vertical portion, and the magnetic force of the magnet in the first vertical portion is smaller than the magnetic force of the magnet in the second vertical portion and the magnetic force of the magnet in the horizontal portion.

[0009] By magnetically attaching a magnet packing to a magnetic sheet fixed around the door body using a magnet, the adhesion between the magnet packing and the door body is improved. By improving the adhesion, a soundproofing effect can be obtained. By using a magnetic sheet, even when the position of the door body is adjusted according to the construction status of the frame body, it is possible to facilitate magnetic attachment to the magnet. By making the magnetic force of the magnet in the first vertical portion located near the doorknob smaller than the magnetic force of other magnets, the force related to the opening of the door body can be reduced.

[0010] (2) The magnet is plate-shaped and has different magnetic attractions on two main surfaces. The magnet in the first vertical portion, the magnet in the second vertical portion, and the magnet in the horizontal portion may have the two main surfaces facing in opposite directions with respect to the magnetic sheet.

[0011] Since the magnetic attraction can be made different only by reversing the main surface of the plate-shaped magnet, the cost can be reduced compared to the case of preparing multiple types of magnets.

[0012] (3) The magnet packing may be elastically deformed so as to approach the magnetic sheet from a natural state in which it is not magnetically attached to the magnetic sheet to a magnetically attached state in which it is magnetically attached to the magnetic sheet.

[0013] Even if the gap between the magnetic sheet and the magnet packing changes due to adjustment during the construction of the door body, a soundproofing effect can be obtained by magnetically attaching the magnet packing to the magnetic sheet by the magnetic force of the magnet.

[0014] (4) The door body may be fixed to the frame body by a hinge having a plurality of axes.

[0015] When the door body closes, it rotates while moving toward the strike side by means of a hinge having multiple axes. The door body rotates by means of the hinge while bringing one main surface closer to the strike. As the one main surface of the door body rotates while facing the strike, the entire magnetic sheet located around the door body moves toward the magnet packing. Since the door body can be brought closer to the magnetic sheets of the first vertical portion and the second vertical portion 18, the curvature of the magnet packing in the left-right direction caused by the rotation of the door body can be suppressed, and the magnetic attachment between the magnet packing and the magnetic sheet can be stabilized.

Advantages of the Invention

[0016] According to the present invention, it is possible to provide a soundproof door that can be easily opened without reducing soundproof performance.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Embodiments for Carrying Out the Invention

[0018] Hereinafter, embodiments of the present invention will be described with reference to the drawings as appropriate. It should be noted that the embodiments described below are merely examples in which the present invention is embodied, and it goes without saying that the embodiments can be appropriately changed without changing the gist of the present invention.

[0019] Hereinafter, as directions related to the soundproof door 1, an up-down direction 7, a front-back direction 8, and a left-right direction 9 are shown. Both the front-back direction 8 and the left-right direction 9 are directions orthogonal to the up-down direction 7 and are orthogonal to each other. The up-down direction 7 is the direction in which the vertical frame 21 extends and is the longitudinal direction of the door body 13. The left-right direction 9 is the direction in which the horizontal frame 22 extends and is the lateral direction of the door body 13. The front-back direction 8 is the thickness direction of the door body 13 in the closed state.

[0020] [Soundproof Door 1] As shown in FIGS. 1 and 2, the soundproof door 1 is, for example, a door installed in a general house or the like. The soundproof door 1 includes a frame body 11, a doorstop 12, a door body 13, a doorknob 14, a hinge 15, a magnet packing 16, and a magnetic sheet 18.

[0021] As shown in FIGS. 1 to 4, the frame body 11 is a frame that partitions the outer periphery of the soundproof door 1. The frame body 11 is located at the opening of the wall 20 (see FIG. 3) of the house. The frame body 11 is located, for example, at the opening of the wall 20 that separates a room where soundproofing is expected from a corridor or other rooms. The frame body 11 has a vertical frame 21 and a horizontal frame 22.

[0022] The vertical frame 21 is a plate body extending in the vertical direction 7. The length of the vertical frame 21 in the vertical direction 7 is longer than the length of the door body 13 in the vertical direction 7. The vertical frames 21 are positioned in a pair with a space therebetween in the left-right direction 9. The main surfaces of the pair of vertical frames 21 face each other in the left-right direction 9. The space between the opposing main surfaces of the pair of vertical frames 21 is open to such an extent that the door body 13 in the closed state can be positioned therein. In the present embodiment, the vertical frame 21 closer to the doorknob 14 is also referred to as the left frame 21a. The vertical frame 21 farther from the doorknob 14 is also referred to as the right frame 21b. In the right frame 21b, holes (not shown) for embedding the second fixing portion 52 of the hinge 15 described later are located at a predetermined interval along the vertical direction 7 on the side surface (left side surface) facing the left frame 21a.

[0023] As shown in FIGS. 1, 2, and 5, the horizontal frame 22 is a plate body extending in the left-right direction 9. The length of the horizontal frame 22 in the left-right direction 9 is longer than the length of the door body 13 in the left-right direction 9 in the closed state. The horizontal frame 22 faces in the vertical direction 7. The horizontal frame 22 connects the upper and lower ends of the pair of vertical frames 21. In the present embodiment, the horizontal frames 22 are positioned in a pair in the vertical direction 7. The main surfaces of the pair of horizontal frames 22 face each other in the vertical direction 7. The space between the opposing main surfaces of the pair of horizontal frames 22 is open to such an extent that the door body 13 in the closed state can be positioned between the opposing main surfaces. In the present embodiment, the upper horizontal frame 22 is also referred to as the upper frame 22a. The lower horizontal frame 22 is also referred to as the lower frame 22b. The lower horizontal frame 22 is also referred to as the lower frame 22b. The upper frame 22a connects the upper ends of the left frame 21a and the right frame 21b. The lower frame 22b connects the lower ends of the left frame 21a and the right frame 21b.

[0024] The door stop 12 extends along the vertical frame 21 and the horizontal frame 22 inside the frame body 11. The door stop 12 is fixed to the frame body 11. As shown in FIGS. 2 and 3, the door stop 12 is, for example, an angle bar body. The door stop 12 has a vertical member 25 and a horizontal member 26.

[0025] The vertical member 25 extends in the vertical direction 7. The vertical members 25 are a pair and are fixed to each of the pair of vertical frames 21. The surfaces (side surfaces) of the vertical member 25 in the direction intersecting the vertical direction 7 face the left - right direction 9 and the front - rear direction 8. Among the side surfaces facing the front - rear direction 8, the side surface facing the rear constitutes a part of the contact surface 28 facing the door body 13 in the closed state. In the present embodiment, the vertical member 25 closer to the door knob 14 is also referred to as the left member 25a. The vertical member 25 farther from the door knob 14 is also referred to as the right member 25b.

[0026] The horizontal member 26 extends in the left - right direction 9. The horizontal member 26 is fixed inside the horizontal frame 22. The horizontal member 26 connects the upper ends of the vertical members 25 in the left - right direction 9. The side surfaces of the horizontal member 26 face the vertical direction 7 and the front - rear direction 8. Among the side surfaces facing the front - rear direction 8, the surface facing the rear constitutes a part of the contact surface 28 facing the door body 13 in the closed state. The positions of the contact surface 28 on the vertical member 25 and the contact surface 28 on the horizontal member 26 in the front - rear direction 8 are the same. In the present embodiment, the horizontal members 26 are positioned in a pair in the vertical direction 7. In the present embodiment, the upper horizontal member 26 is also referred to as the upper member 26a. The lower horizontal member 26 is also referred to as the lower member 26b. The upper member 26a connects the upper ends of the left frame 21a and the right frame 21b. The lower member 26b connects the lower ends of the left member 25a and the right member 25b.

[0027] The door body 13 is a plate body. The door body 13 is made of a non - magnetic material. The door body 13 is, for example, wooden. The surface of the door body 13 facing the front in the closed state is the surface facing the door stop 12 (hereinafter also referred to as the front surface 41). The front surface 41 of the door body 13 has dimensions such that it faces the door stop 12 of the vertical member 25 at each of the left and right edges and faces the door stop 12 of the horizontal member 26 at each of the upper and lower edges in the vertical direction 7. Among the side surfaces of the door body 13, a hole (not shown) for embedding the first fixing portion 51 of the hinge 15 described later is located on the side surface (right side surface) facing the right frame 21b.

[0028] As shown in FIGS. 3, 4, and 6, the magnet packing 16 is a resin structure that encloses a magnet 17 in an internal space. The magnet packing 16 is configured, for example, in a strip shape. The strip-shaped magnet packing 16 is positioned along the contact surface 28 of the door stop 12 and is fixed to the contact surface 28. As a result, the strip-shaped magnet packing 16 is configured in a frame shape. The frame-shaped magnet packing 16 is divided into a first vertical portion 31 positioned along the contact surface 28 of the left member 25a, a second vertical portion 32 positioned along the contact surface 28 of the right member 25b, and a horizontal portion 33 positioned along the contact surfaces 28 of the upper member 26a and the lower member 26b. Each magnet packing 16 of the first vertical portion 31, the second vertical portion 32, and the horizontal portion 33 includes an embedding portion 35, a deformation portion 36, a housing portion 37, and a magnet 17.

[0029] The embedding portion 35 is configured in a strip shape. The inside of the embedding portion 35 is hollow. Both main surfaces of the embedding portion 35 bulge in opposite directions. The embedding portion 35 is fixed to the contact surface 28 by being inserted while being deformed inside a groove 29 positioned on the contact surface 28. The embedding portion 35 is adhered to the inner surface of the groove 29, for example, in a state of being inserted inside the groove 29.

[0030] The deformation portion 36 is configured in a strip shape. The deformation portion 36 is connected to one side surface of the embedding portion 35. The inside of the deformation portion 36 is hollow. The surface facing the front of the deformation portion 36 is flat. The surface facing the rear of the deformation portion 36 is a curved surface 38 that curves in an S shape in a cross section extending in the left-right direction 9 and the up-down direction 7. The curved surfaces 38 are positioned in a pair side by side in the left-right direction 9 or the up-down direction 7. As shown in FIGS. 7(a) and 7(b), the deformation portion 36 is elastically deformable from a state of not being magnetically attached to the magnetic sheet 18 (natural state, see FIG. 7(a)) to a state of being magnetically attached to the magnetic sheet 18 (magnetically attached state, see FIG. 7(b)). The deformation portion 36 can extend rearward in the front-rear direction 8, for example, when being magnetically attached to the magnetic sheet 18 in a state where the embedding portion 35 is adhered to the groove 29. Due to the elastic deformation, the deformation portion 36 deforms by a distance d between the natural state and the magnetically attached state.

[0031] The accommodating portion 37 is configured in a strip shape. The accommodating portion 37 is connected to the rear end of the curved surface 38 of the deformable portion 36. Inside the accommodating portion 37, it is hollow. The outer shape and the inner shape of the accommodating portion 37 are both in the shape of a rectangular parallelepiped. One main surface on the outer surface of the accommodating portion 37 is connected to the deformable portion 36. The main surface opposite to one main surface on the outer surface of the accommodating portion 37 is a flat surface. In the following description, the main surface opposite to one main surface on the outer surface of the accommodating portion 37 is also referred to as the exposed surface 39 (see FIG. 4).

[0032] The magnet 17 is an anisotropic magnet. The magnet 17 is plate-shaped. The magnet 17 is encapsulated in the accommodating portion 37. The magnet 17 is positioned along the strip-shaped magnet packing 16. The magnet 17 is positioned in a frame shape in the magnet packing 16.

[0033] As shown in FIGS. 6 and 7(a), the magnetic attracting forces of the two main surfaces of the magnet 17 are different. The magnetic poles of the magnet 17 are respectively positioned on, for example, one main surface (hereinafter also referred to as the strong magnetic surface 171), the other main surface (hereinafter also referred to as the weak magnetic surface 172), and the side surface. The magnetic force lines extend from the strong magnetic surface 171 and the weak magnetic surface 172 toward the side surface. The magnetic flux density of the magnetic force lines extending from the strong magnetic surface 171 is greater than that of the magnetic force lines extending from the weak magnetic surface 172. Therefore, the magnetic force on the side of the strong magnetic surface 171 is greater than the magnetic force on the side of the weak magnetic surface 172. The magnetic attracting force of the strong magnetic surface 171 on the magnetic sheet 18 is greater than the magnetic attracting force of the weak magnetic surface 172 on the magnetic sheet 18. Preferably, the magnetic force on the weak magnetic surface 172 is within the range of 10% to 50% of the magnetic force on the strong magnetic surface 171 in terms of the ratio of the magnetic flux density (gauss).

[0034] In this embodiment, as shown in FIG. 6, in the magnet packing 16 located in the first vertical portion 31, the magnet 17 is enclosed in the accommodating portion 37 with the weak magnetic surface 172 facing the side of the exposed surface 39. That is, in the first vertical portion 31, the strong magnetic surface 171 of the magnet 17 is enclosed in the accommodating portion 37 facing backward. On the other hand, as shown in FIG. 7(a), in the magnet packing 16 located in the second vertical portion 32 and the horizontal portion 33, the magnet 17 is enclosed in the accommodating portion 37 with the strong magnetic surface 171 facing the side of the exposed surface 39. That is, in the second vertical portion 32 and the horizontal portion 33, the weak magnetic surface 172 of the magnet 17 is enclosed in the accommodating portion 37 facing backward. Thereby, the magnetic attraction force of the magnet 17 in the first vertical portion 31 (the magnetic attraction force directed toward the door main body 13) is smaller than the magnetic attraction force of the magnet 17 in the second vertical portion 32 and the horizontal portion 33 (the magnetic attraction force directed toward the door main body 13).

[0035] [Manufacturing Method of Magnet Packing 16] The magnet packing 16 is, for example, pre-formed in a frame shape and then carried into the construction site. The manufacturing method of the magnet packing 16 includes a cutting step, an accommodating step, and a welding step.

[0036] In the cutting step, the belt-shaped packing body 161 composed of the embedding portion 35, the deformation portion 36, and the accommodating portion 37 is cut to the lengths of the first vertical portion 31, the second vertical portion 32, and the horizontal portion 33. The packing body 161 is cut into two pieces according to the length of the horizontal portion 33.

[0037] In the accommodating step, the magnet 17 is accommodated in the packing body 161. In the packing body 161 of the first vertical portion 31, as shown in FIG. 6, the magnet 17 is accommodated in the accommodating portion 37 with the weak magnetic surface 172 facing the side of the exposed surface 39. On the other hand, in the packing body 161 of the second vertical portion 32 and the horizontal portion 33, as shown in FIG. 7(a), the magnet 17 is accommodated in the accommodating portion 37 with the strong magnetic surface 171 facing the side of the exposed surface 39.

[0038] In the welding stage, the packing body 161 of the first vertical portion 31, the second vertical portion 32, and the horizontal portion 33 is welded in a frame shape. That is, both ends of the first vertical portion 31 and the second vertical portion 32 are welded to both ends of the horizontal portion 33. Thereby, the magnetic packing 16 configured in a frame shape is manufactured.

[0039] The magnetic sheet 18 is, for example, a steel plate. The magnetic sheet 18 is fixed around the surface (front surface 41) facing the door stop 12 in a closed state on the door body 13. The magnetic sheet 18 is, for example, positioned and fixed in a strip shape along the edge of the front surface 41. The width of the magnetic sheet 18 is larger than the width of the exposed surface 39 of the housing portion 37.

[0040] As shown in FIGS. 2, 8, and 9, the hinge 15 rotatably fixes the door body 13 to the right frame 21b. The hinge 15 is, for example, a concealed hinge 15 having a plurality of axes. In the present embodiment, the hinge 15 rotates the door body 13 with respect to the right frame 21b by rotating five axes. The hinge 15 is a concealed hinge 15 and has a plurality of axes. In the vertical direction 7, a plurality of hinges 15 are positioned. Each of the hinges 15 includes a first fixing portion 51, a second fixing portion 52, a first protruding piece 54, a second protruding piece 55, a third protruding piece 56, and a fourth protruding piece 57.

[0041] The first fixing portion 51 and the second fixing portion 52 are box-shaped bodies with one side opening in a rectangle and are in a rectangular parallelepiped shape. At both ends in the longitudinal direction of the first fixing portion 51, a pair of plate-shaped flanges extending in the longitudinal direction are connected to both longitudinal ends of the opening. The first fixing portion 51 is embedded in the right side surface of the door body 13 with the longitudinal direction facing the vertical direction 7. In a state where the first fixing portion 51 is embedded, the opening is exposed outward. The second fixing portion 52 is embedded in the surface facing the left side of the right frame 21b with the longitudinal direction facing the vertical direction 7. In a state where the second fixing portion 52 is embedded, the opening is exposed outward.

[0042] The first tab 54 is a plate body. One end of the first tab 54 is located inside the opening of the first fixing portion 51. One end of the first tab 54 is axially fixed by a first shaft body (not shown) whose axial direction is in the vertical direction 7 of the first fixing portion 51 inside the opening of the first fixing portion 51.

[0043] The second tab 55 is a plate body. One end of the second tab 55 is located inside the opening of the second fixing portion 52. One end of the second tab 55 is axially fixed by a second shaft body (not shown) whose axial direction is in the vertical direction 7 of the second fixing portion 52 inside the opening of the second fixing portion 52. Note that the longitudinal direction of the second fixing portion 52 and the longitudinal direction of the second fixing portion 52 are in the same direction.

[0044] The third tab 56 is a plate body. There are a pair of the third tabs 56. The pair of third tabs 56 are located apart along the other end of the first tab 54. One ends of the pair of third tabs 56 are axially fixed by a third shaft body 61 whose axial direction is in the vertical direction 7 of the other end of the first tab 54 and the first fixing portion 51.

[0045] The fourth tab 57 is a plate body. The fourth tab 57 is located between the pair of third tabs 56. One end of the fourth tab 57 is axially fixed by a fourth shaft body 62 whose axial direction is in the longitudinal direction (vertical direction 7) of the middle portion of the third tab 56 and the first fixing portion 51. The other end of the fourth tab 57 is axially fixed by a fifth shaft body 63 whose axial direction is in the vertical direction 7 of the other end of the second tab 55 and the first fixing portion 51.

[0046] [Closing operation of the soundproof door 1] As shown in FIG. 2, from the state where the door body 13 is opened, the doorknob 14 is gripped. By rotating the door body 13 using the doorknob 14, the door body 13 starts to shift from the opened state to the closed state. The door body 13 rotates with respect to the frame body 11 by the rotation of the first tab 54, the second tab 55, the third tab 56, and the fourth tab 57 around the first shaft body, the second shaft body, the third shaft body 61, the fourth shaft body 62, and the fifth shaft body 63 as the axes. The door body 13 shifts from the opened state to the closing state, for example, by rotating clockwise when viewed from above.

[0047] As the door body 13 rotates, the third protruding piece 56 and the fourth protruding piece 57 gradually move forward. The third shaft body 61, the fourth shaft body 62, and the fifth shaft body 63 move toward the inside of the opening of the second fixing portion 52. In response to the rotation of the door body 13, the first shaft body, the third shaft body 61, the fourth shaft body 62, and the fifth shaft body 63 gradually approach the second shaft body. As the third shaft body 61, the fourth shaft body 62, and the fifth shaft body 63 approach the second shaft body, the door body 13 rotates while moving forward as shown in FIG. 10.

[0048] As the door body 13 rotates while moving forward, the front surface 41 of the door body 13 also rotates while moving forward. The front surface 41 of the door body 13 approaches the magnet packing 16 while rotating.

[0049] The door body 13 is rotated to the latch position with the left frame 21a and is fixed by a latch (not shown) to be in a closed state. The magnetic sheet 18 located on the front surface 41 of the door body 13 faces the magnet packing 16 in the front-rear direction 8. That is, the magnetic sheet 18 faces the exposed surface 39 of the accommodating portion 37. Thereby, the magnet 17 receives a force to move toward the magnetic sheet 18 by magnetic force.

[0050] When the deformable portion 36 elastically deforms, the accommodating portion 37 moves toward the magnetic sheet 18. Thereby, the magnet 17 magnetically adheres to the magnetic sheet 18 via the exposed surface 39. When the magnet packing 16 fixed to the first vertical portion 31, the second vertical portion 32, and the horizontal portion 33 is in close contact with the magnetic sheet 18 located on the front surface 41 of the door body 13, the gap between the entire circumference of the front surface 41 of the door body 13 and the door stop 12 is removed. Thereby, the sound insulation effect by the sound insulation door 1 can be obtained. Further, as the front surface 41 of the door body 13 rotates while approaching the magnet packing 16, the stability when the magnet packing 16 is in close contact with the magnetic sheet 18 can be improved.

[0051] [Opening operation of the sound insulation door 1] From the state where the door is closed, the doorknob 14 is grasped. When the latch is released using the doorknob 14 and the door body 13 is rotated, the door body 13 starts to shift from the closed state to the open state. At the start of rotation, there is a magnetic attraction force of the magnet 17 to the magnetic sheet 18 on the door body 13 against the rotational force. The door body 13 starts to rotate against the magnetic attraction force of the magnet 17 to the magnetic sheet 18.

[0052] When the rotation of the door body 13 starts, the entire deformed portion 36 of the magnet packing 16 extends rearward in the longitudinal direction 8 beyond the distance d (see FIGS. 7(a) and 7(b)) due to the magnetic attraction force between the magnetic sheet 18 and the magnet 17. When the door body 13 is further rotated against the magnetic attraction force, the deformed portion 36 of the magnet packing 16 on the side closer to the doorknob 14 (the first vertical portion 31) extends more. When the door body 13 is further rotated, the force for extending the deformed portion 36 becomes greater than the magnetic attraction force between the magnet packing 16 and the magnetic sheet 18 in the first vertical portion 31. As a result, the magnetic attachment between the magnetic sheet 18 and the magnet packing 16 in the first vertical portion 31 is released. Thus, the magnetic attachment of the magnet packing 16 to the magnetic sheet 18 is partially released. The deformed portion 36 of the magnet packing 16 in the first vertical portion 31 returns to the natural state (see FIG. 7(a)) due to the release of the magnetic attachment. When the magnetic attachment of the first vertical portion 31 is released, the force required to rotate the door body 13 decreases compared to the initial stage.

[0053] When the door body 13 is further rotated, the deformed portion 36 of the magnet packing 16 in the horizontal portion 33 extends further rearward in the longitudinal direction 8 as the door body 13 rotates. Due to further rotation, the force for extending the deformed portion 36 becomes greater than the magnetic attraction force by the magnet packing 16 in the horizontal portion 33. As a result, the magnet packing 16 in the horizontal portion 33 is gradually released from the magnetic attachment with the magnetic sheet 18 starting from the side closer to the first vertical portion 31 (the left side). The deformed portion 36 of the magnet packing 16 in the horizontal portion 33 returns to the natural state (see FIG. 7(a)) due to the release of the magnetic attachment.

[0054] When the door body 13 is further rotated, the deformed portion 36 of the magnet packing 16 of the second vertical portion 32 extends further toward the rear side in the front-rear direction 8 as the door body 13 rotates. Due to further rotation, the force for extending the deformed portion 36 becomes greater than the magnetic attraction force by the magnet packing 16 of the second vertical portion 32. As a result, the magnet packing 16 of the second vertical portion 32 is released from magnetic attachment to the magnetic sheet 18. The deformed portion 36 in the magnet packing 16 of the second vertical portion 32 returns to its natural state (see FIG. 7(a)) due to the release of magnetic attachment. Thereby, the door body 13 is released from the magnetic attachment between the magnetic sheet 18 and the magnet packing 16 and becomes rotatable. Then, by further rotation, the door body 13 is opened.

[0055] [Function and Effect of the Soundproof Door 1 According to the Embodiment] By magnetically attaching the magnet packing 16 to the magnetic sheet 18 fixed around the door body 13 using the magnet 17, the adhesion between the magnet packing 16 and the door body 13 is improved. By improving the adhesion, a soundproof effect can be obtained. By using the magnetic sheet 18, even when the position of the door body 13 is adjusted according to the construction situation of the frame body 11, it is possible to facilitate magnetic attachment to the magnet 17. By making the magnetic force of the magnet 17 in the first vertical portion 31 located near the door knob 14 smaller than the magnetic force of other magnets 17, the force required to open the door body 13 can be reduced.

[0056] Since the magnetic attraction force can be made different only by reversing the main surface of the plate-shaped magnet 17, the cost can be reduced compared to the case of preparing a plurality of types of magnets 17.

[0057] Depending on dimensional errors between the door body 13 and the frame body 11, the proficiency of constructors, etc., the position of the hinge 15 is adjusted, thereby adjusting the position of the door body 13 with respect to the frame body 11. Due to this adjustment, the distance and relative position between the position of the magnetic sheet 18 and the magnet packing 16 change each time of construction. When the door body 13 is in a closed state, the magnet packing 16 elastically deforms, causing the magnet 17 to approach the magnetic sheet 18 and magnetically adhere thereto. Thereby, even when the distance and relative position are different each time, the magnetic sheet 18 and the magnet packing 16 can be brought into close contact to obtain a sound insulation effect.

[0058] When the door body 13 closes, it rotates while moving toward the door stop 12 side by a hinge 15 having multiple axes. The door body 13 rotates by the hinge 15 while bringing one main surface closer to the door stop 12. As the one main surface of the door body 13 rotates toward the door stop 12, the entire magnetic sheet 18 located around the door body 13 moves toward the magnet packing 16. Since the door body 13 can be brought closer to the magnetic sheet 18 of the first vertical portion 31 and the second vertical portion 32, the bending of the magnet packing 16 in the left - right direction 9 caused by the rotation of the door body 13 can be suppressed, and the magnetic adhesion between the magnet packing 16 and the magnetic sheet 18 can be stabilized.

[0059] (Modification example) In the above - described embodiment, the frame body 11 is described as having the lower frame 22b, but it is not limited thereto. The sound - proof door 1 may have only the upper frame 22a for the horizontal frame 22, and may not have the lower frame 22b and the lower member 26b in the lower frame 22b.

[0060] In the above - described embodiment, the magnet 17 is described as an anisotropic magnet, but it is not limited thereto. A plurality of magnets 17 with different magnetic forces may be prepared for the magnet 17. A difference in the strength of the magnetic force between the first vertical portion 31 and the second vertical portion 32 and the horizontal portion 33 may be realized by a plurality of magnets 17 with different magnetic forces.

[0061] In the above embodiment, although the hinge 15 is assumed to have a plurality of axes, the present invention is not limited to this. The hinge 15 may have a single axis.

[0062] [Appendix 1] A frame body located at an opening in a wall of a house, A doorstop fixed to the above frame body, A non-magnetic door body that opens or closes the inside of the above frame body, A doorknob fixed to the above door body, In the above doorstop, a magnet packing that is fixed to a contact surface facing the above door body in a closed state and has a magnet in its internal space, In the above door body, a magnetic sheet fixed around a surface facing the above doorstop in a closed state, comprising: The above frame body has a pair of vertical frames and a horizontal frame connecting the upper ends of the vertical frames, The above doorstop has vertical members respectively fixed to the pair of vertical frames and a horizontal member fixed to the above horizontal frame, The above magnet packing has a first vertical portion and a second vertical portion respectively fixed to the above vertical members and a horizontal portion fixed to the above horizontal member, The above first vertical portion is closer to the above doorknob than the above second vertical portion, The magnetic force of the magnet in the above first vertical portion is smaller than the magnetic force of the magnet in the above second vertical portion and the magnetic force of the magnet in the above horizontal portion. A soundproof door.

[0063] [Appendix 2] The above magnet is plate-shaped and has different magnetic attractions on two main surfaces, The magnet in the above first vertical portion, the magnet in the above second vertical portion, and the magnet in the above horizontal portion are the soundproof doors according to Appendix 1, wherein the two main surfaces are opposite to the above magnetic sheet.

[0064] [Appendix 3] The magnetic packing is the soundproof door according to Appendix 1 or 2, which elastically deforms so as to approach the magnetic sheet from the natural state not magnetically attached to the magnetic sheet to the magnetically attached state magnetically attached to the magnetic sheet.

[0065] [Appendix 4] The door body is the soundproof door according to Appendix 3, which is fixed to the frame body by a hinge having a plurality of axes.

Explanation of Signs

[0066] 1 ··· Soundproof door 11 ··· Frame body 12 ··· Door stop 13 ··· Door body 14 ··· Door knob 15 ··· Hinge 16 ··· Magnetic packing 17 ··· Magnet 18 ··· Magnetic sheet 20 ··· Wall 21 ··· Vertical frame 22 ··· Horizontal frame 25 ··· Vertical member 26 ··· Horizontal member 28 ··· Contact surface 31 ··· First vertical part 32 ··· Second vertical part 33 ··· Horizontal part

Claims

1. A frame located at an opening in a wall of a house, a doorstop fixed to the frame, a non-magnetic door body that opens or closes the inside of the frame, a doorknob fixed to the door body, in the doorstop, a magnet packing fixed to a contact surface facing the closed door body and having a magnet in an internal space, in the door body, a magnetic sheet fixed around a surface facing the doorstop in a closed state, and comprising: the frame has a pair of vertical frames and a horizontal frame connecting the upper ends of the vertical frames, the doorstop has vertical members respectively fixed to the pair of vertical frames and a horizontal member fixed to the horizontal frame, the magnet packing has a first vertical portion and a second vertical portion respectively fixed to the vertical members and a horizontal portion fixed to the horizontal member, the first vertical portion is closer to the doorknob than the second vertical portion, a soundproof door in which the magnetic force of the magnet in the first vertical portion is smaller than the magnetic force of the magnet in the second vertical portion and the magnetic force of the magnet in the horizontal portion.

2. the magnet is plate-shaped and has different magnetic attractions on two main surfaces, the magnet in the first vertical portion, the magnet in the second vertical portion, and the magnet in the horizontal portion are such that the two main surfaces face the magnetic sheet in opposite directions, the soundproof door according to claim 1.

3. the magnet packing is elastically deformed so as to approach the magnetic sheet from a natural state in which it is not magnetically attached to the magnetic sheet to a magnetically attached state in which it is magnetically attached to the magnetic sheet, the soundproof door according to claim 1 or 2.

4. the door body is fixed to the frame by a hinge having a plurality of axes, the soundproof door according to claim 3.

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