Sliding door

Abstract

To provide a sliding door whose airtightness and durability can be enhanced.SOLUTION: A sliding door 1 configured such that a door 20 is suspended on wheels 36 that run along a rail 31 provided on an upper frame 11 of a door frame 10, wherein the rail 31 has a main rail 32 provided parallel to a width direction of the door frame 10, and a pair of branch rails 33 and 34 branching from the main rail 32 and extending in a direction intersecting the width direction toward an opening 10h of the door frame 10, the pair of branch rails 33 and 34 being parallel to each other, and grooves 33g and 34g formed in the pair of branch rails 33 and 34 and a groove 32g formed in the main rail 32 being arranged so as to be continuous with each other, and a guide section being provided in the main rail 32 to mitigate an impact applied to the wheel 36 located on a rear side in a moving direction of the door 20 when the wheel 36 moves to a branch rail 34 located on the rear side in the moving direction of the door 20 among the pair of branch rails 33 and 34 and passes through the groove 32g of the main rail 32.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a sliding door. [Background technology]

[0002] There are two types of doors that open and close openings in homes and other places: swing doors and sliding doors, each with its own advantages and disadvantages.Swing doors and sliding doors each have their own advantages.Compared to swing doors, sliding doors have the advantage of being able to reduce the space the door needs to move through when opened (i.e., the space in front and behind the door), but they have the disadvantage of requiring space for the door to move to either the left or right side of the opening (i.e., in the direction the door moves).Furthermore, when the door is closed, only the tip of the door comes into contact with the door frame, which creates the problem of reducing the door's airtightness.

[0003] Patent Documents 1 to 3 disclose techniques that address the aforementioned design issues. The techniques described in Patent Documents 1 to 3 have a structure in which a rail is provided within the upper frame of a door frame, and a door is suspended from wheels that move along the rail. The rail includes a linear main rail that extends along the wall surface and multiple branch rails that branch off from the main rail and extend in a forward direction toward an opening in the wall. The bottom walls of the main rail and the multiple branch rails form tracks along which the wheels run, and the wheels and the door are connected by axles inserted into grooves formed to connect the inside and outside of the rail. With this structure, when the door is moved in the opening direction, it can be moved in a direction away from the wall surface and along the wall surface along the forward direction. Conversely, when the door is moved in the closing direction, it can be moved in a direction toward the wall surface and along the wall surface along the forward direction. This allows the surface of the door on the forward direction to come into contact with the door frame when the door is closed, potentially improving the door's airtightness. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 4200468 [Patent Document 2] Japanese Patent Application Laid-Open No. 2002-089125 [Patent Document 3] Patent No. 3433145 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the technologies of Patent Documents 1 to 3, there is only one main rail, so when the wheels move from the main rail to the branch rail located at the forefront in the door closing direction among the multiple branch rails, they move continuously on the bottom wall, but when the wheels move from the main rail to the branch rail on the other branch rails, they move over a groove. As a result, the wheels are subjected to a large impact when they move over the groove, which damages the wheels in a short period of time and reduces the durability of the sliding door itself.

[0006] SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide a sliding door that can improve airtightness and durability. [Means for solving the problem]

[0007] The sliding door of the first invention is a sliding door in which the door is hung from wheels that run on rails attached to the upper frame of the door frame, and the rails include a main rail that is arranged parallel to the sight direction of the door frame and has a groove formed in its bottom wall extending along the axial direction, and a pair of parallel branch rails that branch off from the main rail and extend in a direction intersecting the sight direction toward the opening of the door frame and have a groove formed in its bottom wall extending along the axial direction, the grooves formed in the pair of branch rails and the groove formed in the main rail are arranged so that they are continuous, and the main rail is provided with a guide part that absorbs the impact applied to the wheels located behind the door in the movement direction when the wheels pass through the grooves in the main rail. The sliding door of the second invention is characterized in that, in the first invention, the guide portion is a connecting wall that is arranged to block the groove of the main rail and has an upper surface that is flush with the upper surface of the bottom wall of the main rail and the upper surface of the bottom wall of the branch rail. The sliding door of the third invention is characterized in that, in the first invention, a door stop made of a ferromagnetic material is provided around the opening of the door frame so as to surround the opening, and a packing member containing a magnet is provided on the surface of the door on the opening side at a position corresponding to the door stop. The sliding door of the fourth invention is characterized in that, in the first invention, it has side wall surfaces on the sides of the opening in the door frame that are flush with the surface of the door when it is closed. The sliding door of the fifth invention is a sliding door in which the door is hung from wheels that run on rails attached to the upper frame of the door frame, the rails comprising: a main rail that is arranged parallel to the sight direction of the door frame and has a groove formed in its bottom wall extending along the axial direction; and a branch rail that branches off from the main rail and extends in a direction intersecting the sight direction toward the opening of the door frame and has a groove formed in its bottom wall extending along the axial direction, the groove formed in the branch rail and the groove formed in the main rail are arranged so as to be continuous, a door stop made of a ferromagnetic material is provided around the periphery of the opening of the door frame so as to surround the opening, and a packing member containing a magnet is provided on the surface of the door on the opening side at a position corresponding to the door stop. [Effects of the Invention]

[0008] According to the first aspect of the present invention, the guide portion can reduce the impact on the wheels when they pass through the grooves of the main rail, thereby preventing damage to the wheels and the like and increasing the durability of the sliding door. According to the second aspect of the present invention, the wheels move on the connecting wall, so that the door moves smoothly. According to the third aspect of the present invention, airtightness can be improved when the door is closed. According to the fourth aspect of the invention, when the door is closed, the surface of the door and the side wall surface can be made almost flush. Moreover, since there is only one main rail, the width of the upper frame in the projecting direction can be shortened, improving the design of the door. According to the fifth aspect of the present invention, airtightness can be improved when the door is closed. [Brief explanation of the drawings]

[0009] [Figure 1] 1A and 1B are schematic explanatory views of the sliding door 1 of this embodiment with the door 20 closed, in which (A) is a cross-sectional view taken along line AA in (B), and (B) is a schematic front view. [Figure 2] 1A and 1B are schematic explanatory views showing the sliding door 1 of the present embodiment with the door 20 in an open state, in which (A) is a cross-sectional view taken along line AA in (B), and (B) is a schematic front view. [Figure 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 2 is a schematic enlarged view of the door 20 portion of FIG. 1(A). [Figure 5] 1A and 1B are schematic explanatory diagrams of a guide mechanism 30, in which (A) is a view from the front side of the door 20, and (B) is a cross-sectional view taken along line BB in (A). [Figure 6] (A) is a diagram illustrating the positions of the rail 31, the door 20, and the pair of hanging members 35 when the door 20 is open, and (B) is a diagram illustrating the positions of the rail 31, the door 20, and the pair of hanging members 35 when the door 20 is closed. [Figure 7] 1A and 1B are schematic explanatory views of a guide groove 30g of a guide mechanism 30 provided in the bottom frame 12 of a door frame 10, in which (A) is a plan view and (B) is a view taken along the line BB in (A). [Figure 8] 10 is a schematic explanatory diagram of the movement of wheel portions 36 of a pair of hanging members 35 along rails 31. FIG. [Figure 9] 1A and 1B are schematic explanatory views of a door frame 10 alone, in which (A) is a cross-sectional view taken along line AA of (B), and (B) is a schematic front view. [Figure 10] 1A and 1B are schematic explanatory views of the door 20 alone, in which (A) is a plan view and (B) is a front view. [Figure 11]1A and 1B are schematic explanatory views of the door 20 alone, in which (A) is a plan view and (B) is a rear view. [Figure 12] 10A and 10B are schematic explanatory views of a sliding door 1 according to another embodiment with the door 20 closed, in which (A) is a cross-sectional view taken along line AA in (B), and (B) is a schematic front view. DETAILED DESCRIPTION OF THE INVENTION

[0010] The sliding door of this embodiment is characterized by being able to improve airtightness when the door is closed, and also by being able to improve durability.

[0011] The sliding door of this embodiment can be used in any location. For example, it can be used in the entrance or indoor entrance of an apartment or residence, the entrance or patient room of a nursing home or hospital, or the entrance of a Japanese-style hotel. It can also be used in indoor entrances such as toilets and bedrooms.

[0012] <Sliding door 1 of this embodiment> The sliding door of this embodiment will be described below with reference to the drawings. 1 and 2 show a state in which the sliding door 1 of this embodiment is installed on a wall surface. As shown in Fig. 1 and 2, the sliding door 1 of this embodiment includes a door frame 10, a door 20, and a guide mechanism 30.

[0013] <Door Frame 10> As shown in Figures 1, 2, and 9, the door frame 10 has an upper frame 11, a lower frame 12, left and right vertical frames 13, 14, and an intermediate frame 15 provided between the vertical frames 13, 14. The door frame 10 also has a side wall surface 16 between the frame 14 and the intermediate frame 15. An opening 10h is formed in the area surrounded by the upper frame 11, the lower frame 12, the vertical frames 13, and the intermediate frame 15. The door frame 10 also has a door stop 17 provided to surround the opening 10h, and the door 20 is arranged so that an inner surface 20a of the door 20 (see Figures 1(A), 3, and 4) comes into contact with the door stop 17 when the door 20 is closed.

[0014] The upper frame 11 of the door frame 10 is provided with rails 31 of a guide mechanism 30 that guides the movement of the door 20, and the lower frame 12 of the door frame 10 is formed with guide grooves 30g of the guide mechanism 30 that guide the movement of the door 20. Details of the rails 31 and guide grooves 30g of the guide mechanism 30 will be described later.

[0015] <Door 20> As shown in FIG. 1, the door 20 is a member formed to a size that allows it to close the opening 10h. A packing 20p is provided on the surface 20a of the door 20 at a position that corresponds to the door stop 17 of the door frame 10 when the door 20 is closed. The door stop 17 is provided so as to surround the opening 10h, and therefore the packing 20p is provided on the surface 20a of the door 20 so as to form an area 20s surrounded by the packing 20p. In other words, the door 20 is formed so that when the door 20 is closed and the packing 20p on its inner surface 20a comes into contact with the door stop 17 of the door frame 10, the packing 20p can airtightly separate the space inside the door 20 (the space to the right in FIGS. 3 and 4) from the space outside the door 20 (the space to the left in FIGS. 3 and 4). In this context, airtightness includes both a state in which no gas leaks between the door 20 and the door frame 10, and a state in which some gas leaks between the door 20 and the door frame 10 but the airtightness is high.

[0016] 3, the door 20 is suspended from a rail 31 by a suspension member 35 of a guide mechanism 30, and is configured to move along the rail 31 by a wheel portion 36 of the suspension member 35. In addition, a cam member 39 is provided at the bottom of the door 20, which is inserted into a guide groove 30g of the guide mechanism 30 and guides the movement of the door 20 along the guide groove 30g.

[0017] <Guide mechanism 30> As shown in FIG. 5, the guide mechanism 30 includes a rail 31 provided within the upper frame 11, which has a main rail 32 and a pair of branch rails 33 and 34 branching off from the main rail.

[0018] The main rail 32 is a member formed, for example, from a square pipe, and is provided so that its axial direction extends along the viewing direction of the door frame 10 (in other words, along the wall surface on which the door frame 10 is installed (in the left-right direction in FIG. 1)). Note that, in the main rail 32, the side wall located below (in other words, on the opening 10h side) when installed within the upper frame 11 may be referred to as the bottom wall 32a below.

[0019] The pair of branch rails 33, 34 are components formed, for example, from square pipes. Of the pair of branch rails 33, 34, the branch rail 33 is provided so that its base end is continuous with the tip end of the main rail 32 (see FIG. 5(B)). That is, the branch rail 33 is provided so that its internal space is connected to the space within the main rail 32 at its base end. The branch rail 33 is provided so that its axial direction intersects with the axial direction of the main rail 32. Specifically, the branch rail 33 is provided so that it extends from its base end to its tip end in a direction intersecting the front view direction (the left-right direction in FIG. 5(B)) toward the opening 10h of the door frame 10. For example, as shown in FIG. 5(B), the branch rail 33 may be partially arc-shaped and so that the axial direction of its tip end is parallel to the front view direction. Note that, in the branch rail 33, the side wall located below (i.e., on the opening 10h side) when installed within the upper frame 11 may be referred to as the bottom wall 33a below.

[0020] The base end of the branch rail 34 is connected to the side wall 32b (the side wall intersecting with the bottom wall 32a) of the main rail 32. The branch rail 34 is provided so that its internal space communicates with the space within the main rail 32 through an opening formed in the side wall 32b (see FIG. 5(B)). That is, the branch rail 34 is provided so that its internal space communicates with the space within the main rail 32 at its base end. The branch rail 34 is provided parallel to the branch rail 33. That is, like the branch rail 33, the branch rail 34 is provided so that its axial direction intersects with the axial direction of the main rail 32. Specifically, the branch rail 34 is arranged to extend from its base end to its tip in a direction that intersects with the sight direction (left-right direction in Figure 5(B)) toward the opening 10h of the door frame 10. For example, as shown in Figure 5(B), the branch rail 334 can be arranged so that a portion is arc-shaped and the axial direction of its tip is parallel to the sight direction. In addition, in the branch rail 34, the side wall that is located below (in other words, on the opening 10h side) when installed within the upper frame 11 may be referred to as the bottom wall 34a below.

[0021] Grooves 32g, 33g, and 34g are provided in the bottom walls 32a, 33a, and 34a of the main rail 32 and the pair of branch rails 33 and 34, respectively. These grooves 32g, 33g, and 34g are all formed along the axial direction of each rail 32, 33, and 34, and are provided to communicate between the interior and exterior of the rail. That is, grooves 32g, 33g, and 34g are provided to communicate with the space on the opening 30h side (see FIG. 5(A)). Grooves 32g and 33g are formed to be continuous, and grooves 32g and 34g are also formed to be continuous. More specifically, groove 32g is provided with a connecting wall 32w provided to close groove 32g. The connecting wall 32w is provided so that its upper surface is flush with the upper surface of the bottom wall 32a and the upper surface of the bottom wall 34a of the branch rail 34. This connecting wall 32w divides groove 32g into groove 32g1 on the tip side and groove 32g2 on the base side (Figure 5(B)), and of groove 32g, groove 32g1 is continuous with groove 33g at its tip, and groove 32g2 is continuous with groove 34g at its tip.

[0022] Note that "the upper surface of connecting wall 32w is provided so as to be flush with the upper surface of bottom wall 32a and the upper surface of bottom wall 34a of branch rail 34" includes a state in which they are completely flush as well as a state in which there is a slight difference in level. Note that "a slight difference in level" means a difference in level that does not damage wheel portion 36 even when wheel portion 36 of hanging member 35 moves between the upper surface of connecting wall 32w and the upper surface of bottom wall 32a and the upper surface of bottom wall 34a of branch rail 34.

[0023] <Hanging member 35> As shown in Figures 10 and 11, the guide mechanism 30 is provided with a pair of hanging members 35A, 35B that hang the door 20 from the rail 31. The pair of hanging members 35A, 35B are provided at the end on the tip side and the end on the base side of the door 20. Specifically, the pair of hanging members 35A, 35B are provided at the end on the tip side and the end on the base side of the door 20 so that they are spaced apart by approximately the same distance as the distance in the view direction of the pair of branch rails 33, 34 described above. Each of the pair of hanging members 35A, 35B is provided with a wheel portion 36 provided inside the rail 31, and a shaft-shaped connecting member 37 whose upper end is connected to the wheel portion 36 and whose lower end is connected to the upper end of the door 20.

[0024] As shown in FIGS. 5(B) and 6, the wheel unit 36 ​​has a pair of wheels 36a, 36a that run on the upper surfaces of the bottom walls 32a, 33a, 34a of the rails 32, 33, 34 of the pair of rails 31, located on both sides of the grooves 32g, 33g, 34g. The pair of wheels 36a, 36a are rotatably mounted on shafts 36b, to which the upper end of a connecting shaft 37a of the connecting member 37 is connected. The connecting shaft 37a is rotatable about its axis but is immovable in its axial direction. The connecting shaft 37a has a length that protrudes downward from the grooves 32g, 33g, 34g of the bottom walls 32a, 33a, 34a of the rails 32, 33, 34, and its lower end is fixed to a fixed portion 37b. The fixed portion 37b is fixed to the upper end of the door 20. In other words, the wheel portion 36 in the rails 32, 33, 34 and the fixed portion 37b of the connecting member 37, in other words, the wheel portion 36 in the rails 32, 33, 34 and the door 20, are connected by the connecting shaft 37a of the connecting member 37 which passes through the grooves 32g, 33g, 34g in the bottom walls 32a, 33a, 34a of the rails 32, 33, 34.

[0025] The connecting shaft 37a may be connected to the fixed portion 37b so as to be rotatable about its axis but not move in the axial direction, while being fixed to the shaft 36b of the wheel portion 36. The connecting shaft 37a may also be connected to both the shaft 36b of the wheel portion 36 and the fixed portion 37b so as to be rotatable about its axis but not move in the axial direction.

[0026] <Guide groove 30g> As shown in FIG. 7 , the upper surface of the bottom frame 12 of the door frame 10 is provided with a guide groove 30g recessed from the upper surface. This guide groove 30g guides the movement of the lower end of the door 20. It is provided approximately vertically below the main rail 32 and the branch rail 34 provided on the top frame 11 and is provided so as to have approximately the same shape as the groove 32g2 of the main rail 32 and the groove 34 of the branch rail 34 in a plan view. "Same shape" here means that the axial length and curvature are the same. The width of the groove 32g2 of the main rail 32 and the groove 34 of the branch rail 34 does not necessarily have to be the same as the width of the guide groove 30g. A cam member 39 provided at the lower end of the door 20 is inserted into this guide groove 30g. This cam member 39 is configured to move smoothly along the guide groove 30g.

[0027] <Operation of the sliding door 1 of this embodiment> The movement of the door 20 of the sliding door 1 of this embodiment, that is, the opening and closing operation, will be described below with reference to Fig. 8. Note that Fig. 8 only shows the rail 31, the door 20, and the wheels 36 of the pair of hanging members 35A, 35B so that the movement of the door 20 can be easily understood.

[0028] First, when the door 20 is closed (see FIG. 1), the door 20 is in a state where the door stop 17 of the door frame 10 and the gasket 20p on its surface 20a are in contact (see FIGS. 3 and 4), and furthermore, the surface is arranged in a state where it is parallel to the front view direction of the door frame 10 (see FIG. 5(B)). Also, in this state, the wheel portions 36 of the pair of hanging members 35A, 35B are both positioned at the tip portions of the pair of branch rails 33, 34 (see FIG. 5(B)). And, because the axial directions of the tip portions of the pair of branch rails 33, 34 are approximately parallel to the front view direction, the wheels 36a, 36a of the wheel portions 36 of the pair of hanging members 35A, 35B are in a state where their rotation planes are approximately parallel to the front view direction. In other words, the wheels 36a, 36a of the wheel portions 36 are in a state where their rotation axes are perpendicular to the front view direction (parallel to the front view direction).

[0029] When the door 20 is opened from a closed state, a force is applied in a direction in which the door 20 moves away from the door frame 10 (i.e., in the front direction of the door 20), and a force is also applied so that the door 20 moves in the front direction. Then, the door 20 moves in the front direction while moving away from the door frame 10 (see FIG. 8(A)). At this time, in the pair of hanging members 35A, 35B that hang the door 20, the connecting shafts 37a of the connecting members 37 are inserted into the grooves 33g, 34g of the pair of branch rails 33, 34. Therefore, guided by the grooves 33g, 34g of the pair of branch rails 33, 34 and the connecting shafts 37a of the connecting members 37, the wheel portions 36 of the pair of hanging members 35A, 35B move from their tip ends to their base ends along the grooves 33g, 34g of the pair of branch rails 33, 34, i.e., from their tip ends toward the main rail 32.

[0030] Furthermore, the pair of hanging members 35A, 35B are provided at the distal end and proximal end of the door 20 so that they are spaced apart by approximately the same distance as the distance in the front direction between the pair of branch rails 33, 34. Moreover, a connecting member 37 is provided to the wheel portion 36 so as to be rotatable about its axis. Therefore, even if the pair of branch rails 33, 34 are arc-shaped, the wheel portions 36 of the pair of hanging members 35A, 35B can move smoothly along the pair of branch rails 33, 34. Moreover, even if the wheel portions 36 of the pair of hanging members 35A, 35B move in an arc-shaped manner along the grooves 33g, 34g of the pair of branch rails 33, 34, the door 20 moves while its surface remains parallel to the front direction of the door frame 10 (see FIG. 8(A)).

[0031] When the wheel units 36 of the hanging members 35, 35 eventually move to the connection between the pair of branch rails 33, 34 and the pair of branch rails 33, 34, the wheels 36a of the wheel units 36 move from the bottom walls 33a, 34a of the pair of branch rails 33, 34 to the bottom wall 32a of the main rail 32. In other words, the wheels 36a of the wheel units 36 are guided by the grooves 31g1, 31g2 of the main rail 31, the grooves 33g, 34g of the pair of branch rails 33, 34, and the connecting shaft 37a of the connecting member 37, and move from the bottom walls 33a, 34a of the pair of branch rails 33, 34 to the bottom wall 32a of the main rail 32 (see FIG. 8(B)).

[0032] At this time, since the bottom walls 32a located on both sides of the groove 32g1 in the bottom wall 32a of the main rail 32 and the bottom walls 33a located on both sides of the grooves 33g of the pair of branch rails 33 are both continuous, the wheels 36a of the wheel section 36 moving on the branch rail 33 move smoothly from the bottom wall 33a of the branch rail 33 to the bottom wall 32a of the main rail 32.

[0033] In addition, in the branch rail 34, the bottom wall 32a (referred to as first side wall 32a1) located on the opening side of the groove 32g2 in the bottom wall 32a of the main rail 32 (upper side in FIG. 8) is continuous with the bottom wall 34a (referred to as first side wall 34a1) located on the opening side of the branch rail 34 (right side in FIG. 8). Therefore, the wheel 36a of the wheel unit 36 ​​moving on the first side wall 34a1 moves smoothly from the first side wall 34a1 to the first side wall 32a1.

[0034] Meanwhile, groove 32g of main rail 32 is present between bottom wall 32a (referred to as second side wall 32a2) located on the opposite side of the opening of groove 32g of bottom wall 32a of main rail 32 (the lower side in FIG. 8) and bottom wall 34a (referred to as second side wall 34a2) located on the opposite side of the opening of branch rail 34 (the left side in FIG. 8). However, a connecting wall 32w is provided in groove 32g of main rail 32 at a position corresponding to second side wall 34a2 of branch rail 34. Moreover, connecting wall 32w is provided so as to be flush with the upper surface of bottom wall 32a and the upper surface of bottom wall 34a of branch rail 34. This allows wheel 36a moving on second side wall 34a2 of branch rail 34 to travel on connecting wall 32w and move to second side wall 32a2. Therefore, the wheels 36a moving on the second side wall 34a2 of the branch rail 34 can also move smoothly to the second side wall 32a2 of the main rail 32 (see FIG. 8(B)).

[0035] When the wheel portions 36 of the pair of hanging members 35A, 35B both move to the main rail 32, the pair of hanging members 35A, 35B can be moved along the main rail 32 (see Figure 8(C)), and the door 20 can move parallel to the viewing direction of the door frame 10, allowing the opening 10h to be completely opened (see Figure 2).

[0036] When closing the door 20, applying force along the find direction moves the wheel portions 36 of the pair of hanging members 35A, 35B along the main rail 32 (see FIG. 8(C)), allowing the door 20 to move along the find direction while keeping its surface parallel to the find direction. When the wheel portions 36 of the pair of hanging members 35A, 35B move to the branch position where the main rail 32 and the pair of branch rails 33, 34 branch off, the wheels 36a of the wheel portions 36 are guided by the grooves 31g1, 31g2 of the main rail 31, the grooves 33g, 34g of the pair of branch rails 33, 34, and the connecting shaft 37a of the connecting member 37, and smoothly move from the main rail 31 to the pair of branch rails 33, 34 (see FIG. 8(A)). Then, the door 20 can be moved in the find direction while moving along the find direction while keeping its surface parallel to the find direction.

[0037] When the door stop 17 of the door frame 10 and the gasket 20p on its surface 20a come into contact, the door 20 is closed and the door 20 can block the opening 10h (see Figures 1, 3, and 4).

[0038] As described above, according to the sliding door 1 of this embodiment, when the door 20 is closed, the gasket 20p on the surface 10a of the door 20 can come into contact with the door stop 17 provided around the opening 10h of the door frame 10, so that even with the sliding door 1, the opening 10h of the door frame 10 can be airtightly sealed.

[0039] Moreover, since the impact applied to the wheel parts 36 of the pair of hanging members 35A, 35B that move the door 20 can be absorbed, damage to the wheel parts 36 can be suppressed, and the sliding door 1 can have high durability.

[0040] <About the Information Desk> In the example described above, connecting walls 32w are provided in grooves 32g in the bottom wall 32 of the main rail 32 to prevent damage to the wheel units 36 of the hanging members 35 even when the wheel units 36 move between the upper surface of the connecting wall 32w, the upper surface of the bottom wall 32a, and the upper surface of the bottom wall 34a of the branch rail 34. However, the mechanism for preventing damage to the wheel units 36 when the wheel units 36 move between the upper surface of the connecting wall 32w, the upper surface of the bottom wall 32a, and the upper surface of the bottom wall 34a of the branch rail 34 is not particularly limited. For example, a bridge or the like may be provided in the bottom wall 32 of the main rail 32, through which the wheels 36a of the wheel units 36 pass when they move in the grooves 32g.

[0041] <Improvement of airtightness> As described above, if the packing 20p on the surface 20a of the door 20 comes into contact with the door stop 17 of the door frame 10 when the door 20 is closed, the airtightness of the sliding door 1 can be made higher than that of a normal sliding door 1. To further increase the airtightness of the sliding door 1, it is desirable to use a structure that increases the adhesion between the door 20 and the door stop 17. For example, a plate made of a ferromagnetic material such as iron or SUS305 is installed on the outer surface of the door stop 17, and a magnet m is embedded in the packing 20p of the door 20 (see FIGS. 3 and 4). In this case, when the door 20 is closed, the magnetic force of the magnet m causes the packing 20p to adhere closely to the door stop 17, preventing the formation of a gap between the door 20 and the door stop 17. Note that the magnet m does not necessarily have to be installed on the entire packing 20p, but installing the magnet m on the entire packing 20p can increase the airtightness of the door 20 when closed.

[0042] <Regarding the side wall surface 16 of the door frame 10> There are no particular limitations on the structure or arrangement of the side wall surface 16 of the door frame 10. As shown in Fig. 12, it is desirable that the side wall surface 16 is provided so that when the door 20 is closed, the side wall surface 16 of the door frame 10 and the outer surface 20b of the door 20 are substantially flush with each other (surface SF in Fig. 12). This reduces the step between the surface 20b of the door 20 and the surface 20b of the side wall surface 16 when the door 20 is closed, thereby improving the design of the sliding door 1.

[0043] <About Rail 31> In the above example, the rail 31 is described as having one main rail 32 and a pair of branch rails 33, 34. However, two main rails may be provided, each with its own branch rail. For example, the two main rails may be installed side by side so that their axial directions are coaxial, and branch rails may be installed at the ends of each main rail so that they are parallel to each other. In this case, the main rail located on the closing side of the door 20 corresponds to the portion of the rail 31 where the groove 32g1 is formed, and the branch rail connected to this main rail corresponds to the branch rail 33. The main rail located on the opening side of the door 20 corresponds to the portion of the rail 31 where the groove 32g2 is formed, and the branch rail connected to this main rail corresponds to the branch rail 34. When two main rails are provided in this way, the two main rails may be connected or installed separately. [Industrial Applicability]

[0044] The sliding door of the present invention is suitable as a door for airtightly opening and closing an opening. [Explanation of symbols]

[0045] 1 sliding door 10 Door Frame 11 Upper frame 12 Bottom frame 16 Side wall 17 per household 20 Doors 20a surface 30 Guide mechanism 31 Rail 32 Main Rail 32a bottom wall 32g groove 32w connecting wall 33 Branch Rail 33a bottom wall 33g groove 34 Branch Rail 34a bottom wall 34g groove 35 Hanging member 36 Wheel section 36a wheels 37 Connecting member

Claims

1. A sliding door in which the door is suspended from wheels that run on rails installed on the upper frame of the door frame, The rail is A main rail provided parallel to the viewing direction of the door frame, and having a groove formed in the bottom wall extending along the axial direction; a pair of parallel branch rails branching from the main rail and extending in a direction intersecting the sight direction toward the opening of the door frame, the branch rails having grooves formed in the bottom walls extending along the axial direction; the grooves formed in the pair of branch rails and the grooves formed in the main rail are provided so as to be continuous with each other, The main rail has: A guide portion is provided to absorb the impact applied to the wheel when the wheel located behind the door in the moving direction passes through the groove of the main rail. A sliding door characterized by:

2. The guide unit is A connecting wall is provided to close the groove of the main rail, and its upper surface is flush with the upper surface of the bottom wall of the main rail and the upper surface of the bottom wall of the branch rail.

2. The sliding door according to claim 1.

3. Around the opening of the door frame, A door stop made of a ferromagnetic material is provided to surround the opening, On the surface of the opening side of the door, A packing member containing a magnet is provided at a position corresponding to the door stop.

2. The sliding door according to claim 1.

4. The door frame has a side wall surface on the side of the opening, the side wall surface being flush with the surface of the door when the door is closed.

2. The sliding door according to claim 1.

5. A sliding door in which the door is suspended from wheels that run on rails installed on the upper frame of the door frame, The rail is A main rail provided parallel to the viewing direction of the door frame, and having a groove formed in the bottom wall extending along the axial direction; a branch rail branching from the main rail and extending toward the opening of the door frame in a direction intersecting the sight direction, the branch rail having a groove formed in a bottom wall extending along the axial direction; a groove formed in the branch rail and a groove formed in the main rail are provided so as to be continuous with each other, Around the opening of the door frame, A door stop made of a ferromagnetic material is provided to surround the opening, On the surface of the opening side of the door, A packing member containing a magnet is provided at a position corresponding to the door stop. A sliding door characterized by:

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