Sliding door mechanism

Abstract

This invention provides a sliding door mechanism that does not require the installation of ground rails. [Solution] A sliding door mechanism (100) includes a sliding door having an upper frame slidably mounted along a rail provided on the ceiling side and a lower frame with a projection toward the floor, wherein the sliding door mechanism (100) includes a sliding door (40) having a lower frame (44) with a projection (80) toward the floor (500), and the floor (500) is provided with a receiving portion (1) capable of accommodating the projection (80) when the sliding door (40) is in the closed position.

Description

Technical Field

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

Background Art

[0002] As an intermediate partition structure arranged to partition an indoor space, there is a sliding door type. The structure shown in Patent Document 1 realizes the opening and closing of the sliding door by laying a floor rail on the floor surface and allowing rollers provided on the bottom side of the sliding door to run bidirectionally on the floor rail.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above-described conventional configuration, the roller is pressed against the floor rail. Therefore, if an impact is applied to the sliding door from the outside and the roller is once disengaged from the floor rail, it is difficult to recover, and a large-scale operation such as removing the sliding door itself is required.

[0005] Further, in the above-described conventional configuration, since the floor rail is laid along the opening and closing section of the sliding door, only the floor rail is visible on the floor surface when the sliding door is in the open state. Also, generally, a carpet is laid on the floor surface, but since a boundary portion with the carpet is formed along the floor rail, "lifting" and "fraying" of the carpet occur at the boundary portion, which easily impairs the appearance.

[0006] Thus, it can be said that there is room for improvement in the structure and appearance of the conventional sliding door configuration.

[0007] Therefore, an aspect of the present invention aims to provide a sliding door mechanism that does not involve laying a floor rail. [Means for solving the problem]

[0008] To solve the above problems, a sliding door mechanism according to one aspect of the present invention includes a sliding door having an upper frame slidably mounted along a rail provided on the ceiling side and a lower frame with a projection extending toward the floor, wherein the projection is provided on a part of the lower frame, and the floor is provided with a receiving portion capable of accommodating the projection when the sliding door is in the closed position, and a floor surface is provided between the tail end of the sliding door in the closed position and the receiving portion. [Effects of the Invention]

[0009] According to one aspect of the present invention, a sliding door mechanism that does not require the laying of ground rails can be provided. [Brief explanation of the drawing]

[0010] [Figure 1] This is an external view of a sliding door mechanism relating to one embodiment of the present invention. [Figure 2] Figure 1 is a plan view of the sliding door mechanism. [Figure 3] This is a plan view of the sliding door mechanism shown in Figure 1, with the sliding door in the open position. [Figure 4] Figure 1 is a longitudinal cross-sectional view of the sliding door mechanism. [Figure 5] This is a magnified view of a portion of Figure 4. [Figure 6] This is a magnified view of a portion of Figure 5. [Figure 7] Figure 1 is a four-view drawing of the receiving portion of the sliding door mechanism. [Figure 8] This is a magnified view of a portion of Figure 3. [Figure 9] This is a magnified view of a portion of Figure 2. [Figure 10] This figure shows a modified version of Figure 8. [Modes for carrying out the invention]

[0011] The sliding door mechanism of one embodiment of the present invention will be described below with reference to Figures 1 to 10. Figure 1 is an external view showing an example of the sliding door mechanism 100 of this embodiment installed in a room. Figure 2 is a cross-sectional view of the sliding door mechanism 100 along the cutting line OO' shown in Figure 1. Figure 3 is a plan view of the sliding door mechanism 100 shown in Figures 1 and 2 when the sliding door is in the open position. In other words, Figures 1 and 2 show the state when the sliding door is in the closed position.

[0012] In Figure 1, two sliding door mechanisms 100 are provided, forming a pair. Each sliding door mechanism 100 has a fixed door 10 and a double sliding door 20 (sliding door).

[0013] As shown in Figure 2, the double sliding doors 20 of each sliding door mechanism 100 are arranged so that their sliding directions are aligned in the same line, and the leading edges of each double sliding door 20 face each other. As shown in Figure 2, when each double sliding door 20 is in the closed position, the sliding door mechanism 100 serves to partition the interior space.

[0014] On the other hand, as shown in Figure 3, when the double sliding doors 20 are in the open position, a person can pass through the space created between the double sliding doors 20 of one sliding door mechanism 100 and the double sliding doors 20 of the other sliding door mechanism 100. In Figure 3, both double sliding doors 20 are in the open position, but it is also possible to use the system with one double sliding door 20 in the open position and the other double sliding door 20 in the closed position.

[0015] Since each sliding door mechanism 100 has the same configuration, the following explanation will focus on one sliding door mechanism 100. Each figure also shows an XYZ three-dimensional coordinate system, where the axis along the sliding direction is defined as the X-axis, the direction perpendicular to the sliding direction as the Y-axis, and the vertical direction as the Z-axis. The positional relationships of each component will be explained using this coordinate system in the following description.

[0016] The sliding door mechanism 100 has a fixed door 10 fixed to the floor 500 and the ceiling 600 shown in FIG. 1 respectively. In addition, when a vertical wall extending toward the floor 500 side is provided on the ceiling 600, the sliding door mechanism 100 may be fixed to the vertical wall.

[0017] The fixed door 10 may have the same panel as the double sliding door 20 or different panels in order to have a unified design with the double sliding door 20. For example, when a transparent panel (for example, a glass panel) is arranged on the double sliding door 20, the fixed door 10 may also have a transparent panel (for example, a glass panel) arranged thereon, or other panels (for example, a steel panel) may be arranged thereon.

[0018] The double sliding door 20 includes two sliding doors 30 and 40. Note that it is not limited to two (two sheets), and may be three (three sheets) or more, or may be composed of only one sliding door. The two sliding doors 30 and 40 of the double sliding door 20 are arranged side by side in the Y-axis direction as shown in FIG. 3, and each is slidable along the X-axis direction to reach the closed position as shown in FIG. 2. Hereinafter, in order to distinguish the two sliding doors 30 and 40, the sliding door 30 is referred to as the child sliding door 30, and the sliding door 40 is referred to as the parent sliding door 40.

[0019] More specifically, the arrangement of the fixed door 10 and the double sliding door 20 is as follows. In the closed position shown in FIG. 2, the vertical frame 11 on the door tip side of the fixed door 10 and the vertical frame 32 on the door butt side of the child sliding door 30 are adjacent to each other in the Y-axis direction. Also, the vertical frame 31 on the door tip side of the child sliding door 30 and the vertical frame 42 on the door butt side of the parent sliding door 40 are adjacent to each other in the Y-axis direction. The vertical frame 41 on the door tip side of the parent sliding door 40 is adjacent to the vertical frame 41 on the door tip side of the parent sliding door 40 configured in the sliding door mechanism 100 forming the above-mentioned pair in the X-axis direction.

[0020] On the other hand, in the open position shown in FIG. 3, the vertical frame 11 on the door tip side of the fixed door 10 and the vertical frame 31 on the door tip side of the child sliding door 30 are adjacent to each other in the Y-axis direction. Also, the vertical frame 32 on the door butt side of the child sliding door 30 and the vertical frame 42 on the door butt side of the parent sliding door 40 are adjacent to each other in the Y-axis direction.

[0021] As shown in Figures 2 and 3, the vertical frames of each sliding door 30, 40 overlap in the Y-axis direction whether they are in the open or closed position. By adopting this arrangement where the vertical frames overlap, the field of view of a person standing on one side of the sliding door mechanism 100 and facing the other side is less likely to be obstructed by the vertical frames (the area of ​​the field of view obstructed by the vertical frames can be minimized).

[0022] As shown in Figures 1 to 3, the leading edge of the main sliding door 40 is provided with a gripping section 50 on the vertical frame 41, which a person can grasp to open and close the sliding door.

[0023] The sliding door 30, the sliding door 40, and the fixed door 10 have a unified design, as mentioned above. In one example, each door includes a rectangular glass panel and a frame surrounding the outer edge along all four sides of the glass panel. The frame consists of the vertical frame on the door-end side and the vertical frame on the door-front side of each door, as mentioned above, and the upper and lower frames, which will be described later. The glass panel is fitted into and held in place by a fitting groove provided on the inner circumference of each frame. Note that the configuration with a glass panel is just one example and is not limited to this configuration.

[0024] Figure 4 is a cross-sectional view showing the configuration of the sliding door mechanism 100 on the ceiling 600 side and the configuration on the floor 500 side. Figure 4 is a cross-sectional view taken along the arrow showing the sliding door mechanism 100 cut at the position of the cutting line AA' shown in Figure 2.

[0025] As shown in Figure 4, the fixed door 10 is fixed to the floor 500 and the ceiling 600, respectively. The smaller sliding door 30 and the main sliding door 40 are mounted to slide along a rail 601 provided on the ceiling 600 side. The smaller sliding door 30 and the main sliding door 40 are so-called suspended doors.

[0026] Specifically, the smaller sliding door 30 and the larger sliding door 40 have upper frames 33 and 43 that are slidably mounted along the rail 601. Note that the configuration of the rail 601 is not limited to the configuration shown in Figure 4.

[0027] Furthermore, the smaller sliding door 30 and the larger sliding door 40 have lower frames 34 and 44 positioned opposite the floor 500. The fixed door 10 also has a lower frame 14 that has the same appearance as the lower frames 34 and 44.

[0028] The lower frames 34 and 44 of the child sliding door 30 and the main sliding door 40 will be explained below using Figure 5. Figure 5 is an enlarged view of the enclosed area B in Figure 4.

[0029] As shown in Figure 5, of the two sliding doors, the main sliding door 40, which is located furthest towards the leading edge when in the closed position, is provided with a projection 80 on its lower frame 44. The projection 80 will be described later.

[0030] Furthermore, a groove 35 is provided in the lower frame 34 of the sliding door 30, which is guided by a guide roller 72 having a vertical rotation axis 71 protruding from the floor 500, and extends along the X-axis direction. The sliding door 30 is slidable in the X-axis direction, guided by the guide roller 72.

[0031] Furthermore, as shown in Figure 5, a mounting fixture 76 with a second guide roller 77 attached to its tip is fixed to the side of the lower frame 34 facing the main sliding door 40. A vertical rotating shaft 78 extending in the vertical direction is provided protruding from the tip of the mounting fixture 76, and the second guide roller 77 is attached to this vertical rotating shaft 78.

[0032] The second guide roller 77 is positioned in a groove 45 provided in the lower frame 44 of the main sliding door 40. The main sliding door 40 is slidable in the X-axis direction guided by the second guide roller 77. The arrangement of the guide roller 72 and the mounting fixture 76 (the second guide roller 77 attached to the mounting fixture 76) is shown in Figure 2.

[0033] As shown in Figure 5, the lower frame 44 of the main sliding door 40 is provided with a projection 80, as previously mentioned. The projection 80 protrudes toward the floor 500. The projection 80 is provided on a part of the lower frame 44, more specifically on the door-edge side of the lower frame 44. The position of the projection 80 provided on the lower frame 44 in a plan view is illustrated in Figures 2 and 3. In this embodiment, the projection 80 is provided on the door-edge side of the lower frame 44, that is, directly below or near the vertical frame 41 on the door-edge side, but is not limited to this. For example, as in the modified example described later, it may be provided in the middle part of the length from the door-edge to the door-end of the lower frame 44, or it may be provided between the middle part and the door-edge.

[0034] Figure 6 shows an enlarged view of the framed area C shown in Figure 5. For the sake of explanation, Figure 6 only illustrates the structure of the projection 80 and its surroundings. As shown in Figure 6, the projection 80 includes a wheel portion 81 and a biasing means 82 that biases the wheel portion 81 and pushes it downward in the negative Z-axis direction. The biasing means 82 is, for example, a spring.

[0035] The wheel portion 81 is configured to rotate around a horizontal rotation axis (not shown) along the horizontal direction (specifically the Y-axis direction). This wheel portion 81 is pushed down in the negative Z-axis direction by the biasing means 82. As a result, the projection 80 rotates the floor 500 in the X-axis direction while the wheel portion 81 remains pressed against the floor 500. Therefore, when a person grasps the gripping portion 50 (for example, Figure 1) and applies force in the X-axis direction to the main sliding door 40, the main sliding door 40 slides in the X-axis direction on the floor 500 by rotating the wheel portion 81.

[0036] As mentioned above, the main sliding door 40 is a suspended door, and apart from the projection 80 that rests on the floor 500, there are no other parts that apply load to the floor 500. Therefore, if the main sliding door 40 is subjected to an external impact, as described above, the leading edge of the main sliding door 40 is prone to swinging in the Y-axis direction. To address this, in this embodiment, as shown in Figures 1 and 3, a receiving part 1 capable of accommodating the projection 80 when the main sliding door 40 is in the closed position is provided on the floor 500.

[0037] The receiving portion 1 is embedded in a part of the floor 500, with its upper surface 2 exposed to the interior. In the plan view of Figure 3, the portion that has a roughly rectangular shape is the upper surface 2. A hole is provided in a part of the flooring material of the floor 500, and the receiving portion 1 is embedded in this hole so that its upper surface 2 is exposed to the interior. The upper surface 2 is flush with the surface of the floor 500.

[0038] The receiving portion 1 is positioned opposite the projection 80 when the main sliding door 40 is in the closed position as shown in Figures 1 and 2. In other words, unlike conventional ground rails, the receiving portion 1 is provided only in the position opposite the projection 80 when the sliding door 40 is in the closed position. When the main sliding door 40 is in the closed position, a floor 500 is provided between the door edge of the sliding door 40 and the receiving portion 1, and neither the receiving portion 1 nor any other rail-like structure is installed in that space.

[0039] The specific configuration of the receiving part 1 will be explained using Figure 7 in conjunction with Figure 6. Figure 7 shows a plan view of the receiving part 1 and side views from three different directions. Note that Figure 7 is the left-hand receiving part 1 of the two receiving parts 1 shown in Figure 3.

[0040] The upper surface 2 of the receiving portion 1 is provided with a groove 3 that accommodates the projection 80 (wheel portion 81) shown in Figure 6. The groove 3 extends along the X-axis direction. The groove 3 includes a bottom portion 5 and a pair of side walls 7 (Figure 7) that rise from both ends of the bottom portion 5 and define the width of the groove 3.

[0041] The pair of side walls 7 restrict the movement of the projection 80 (wheel portion 81). Specifically, the pair of side walls 7 define a width in the swing restriction region F1, which prevents the projection 80 (wheel portion 81) from swinging in the Y-axis direction, that is approximately the same as the width of the projection 80 in the Y-axis direction of the wheel portion 81. As a result, when the projection 80 (wheel portion 81) is located in the swing restriction region F1 of the groove 3, the projection 80 (wheel portion 81) is restricted from moving in the Y-axis direction. In this case, even if the main sliding door 40 is subjected to an external impact as described above, it will not swing unfavorably in the Y-axis direction. Note that, as shown in Figure 2, when the main sliding door 40 is in the closed position, the wheel portion 81 is pressed against the bottom 5 of the swing restriction region F1 by the biasing means 82.

[0042] Furthermore, the guide area F2, which is provided adjacent to the tail end of the swing-restricting area F1, corresponds to the tail end of the groove 3, and at this end, the groove width of the groove 3 widens towards the end. With the groove width widened at the tail end in this way, even if the main sliding door 40 swings slightly in the Y-axis direction when it slides in the positive X-axis direction during the closing operation and approaches the receiving part 1, it can still be placed in the groove 3. The projection 80 (wheel part 81) can then be guided towards the increasingly narrow swing-restricting area F1 by the pair of side walls 7 that define the groove width.

[0043] Furthermore, the upper surface 2 is provided with insertion holes 8 for inserting a fixing device (K in Figure 6) to secure the receiving part 1 to the floor structure (T in Figure 6) below the floor 500 (floor surface). There are two insertion holes 8 within the upper surface 2. These two insertion holes 8 are not aligned in the Y-axis direction, but are offset in the X-axis direction. This is because the receiving part 1 is a small rectangle with a short side along the Y-axis and a long side along the X-axis, and the upper surface 2 itself is also small, so the structural strength of the receiving part 1 can be ensured more effectively than if the insertion holes 8 were aligned in the Y-axis direction.

[0044] Regarding the size of the receiving portion 1 in plan view, that is, the size of the top surface 2 in plan view, the length in the X-axis direction is shorter than the length of the main sliding door 40 along the X-axis direction. In other words, it is shorter than the sliding length of the main sliding door 40. That is, the length of the top surface 2 in the X-axis direction is clearly different from that of a typical ground rail, which extends to the same length as or longer than the length of the main sliding door 40 along the X-axis direction. In one example, the length of the receiving portion 1 along the X-axis direction is approximately equal to the width of the vertical frame 41 along the X-axis direction.

[0045] Furthermore, the length of the receiving portion 1 along the Y-axis is equal to the length of the lower frame 44 along the Y-axis, so it is shorter than that. As a result, the receiving portion 1 is not visible when the main sliding door 40 is in the closed position.

[0046] Furthermore, the outer edge of the upper surface 2 includes a chamfered portion 9 along its entire length. The presence of the chamfered portion 9 makes it difficult to see the boundary with the flooring material (e.g., carpet) of the floor 500, thus reducing friction with the flooring material.

[0047] As described above, the sliding door mechanism 100 of this embodiment includes a main sliding door 40 having a lower frame 44 with a projection 80 projecting toward the floor 500. The projection 80 is provided on the leading edge side of the lower frame 44, and the floor 500 is provided with a receiving portion 1 capable of accommodating the projection 80 when the main sliding door 40 is in the closed position. No rail is laid between the trailing edge of the main sliding door 40 in the closed position and the receiving portion 1; only the floor 500 is provided. With this configuration, because there is no ground rail, it is possible to easily correct the misalignment of the sliding door, which was previously difficult. Also, because there is no ground rail, when the sliding door is in the open position, only the floor 500 (floor surface) is visible, resulting in a stylish appearance. Furthermore, there is no concern about the flooring material (e.g., carpet) curling or fraying at the boundary with the flooring material (e.g., carpet) that would occur with the installation of a ground rail, and the appearance is not spoiled.

[0048] Furthermore, even without a ground rail, the presence of the receiving portion 1 ensures that, in the configuration shown in Figures 1 to 3 where the two main sliding doors 40 open and close along the X-axis, the leading edges of the two main sliding doors 40 are aligned when closed. This allows for the realization of a sliding door mechanism 100 with a robust appearance.

[0049] In the above-described embodiment, the frame on which the protrusion 80 is installed is referred to as the lower frame 44. This lower frame 44 refers to the portion of the frame of the main sliding door 40 that is located along the floor 500. Therefore, in an embodiment where, for example, the lower end of each vertical frame extends to a position adjacent to the floor 500 as shown in Figure 1, the floor 500 side end of the vertical frame is also included in the lower frame 44.

[0050] Furthermore, the sliding door mechanism 100 of this embodiment achieves sound insulation and light leakage prevention by providing gap covers for the gaps between the fixed door 10 and the smaller sliding door 30, and between the smaller sliding door 30 and the main sliding door 40. The gap covers will be described below with reference to Figures 8 and 9.

[0051] Figure 8 is a partial plan view of the sliding door mechanism 100. The portion shown in Figure 8 is a plan view of the framed area D in Figure 2, where the two sliding doors 30 and 40 are in the closed position. In contrast, Figure 9 is a plan view of the framed area E in Figure 3, where the two sliding doors 30 and 40 are in the open position.

[0052] As shown in Figure 8, the vertical frame 42 on the tail end side of the main sliding door 40 has a cover projection 46 and a cover body 47. The cover projection 46 extends along the Z-axis direction on the side 42b of the vertical frame 42 facing the secondary sliding door 30. The cover projection 46 is provided on the tail end side of the side 42b. The cover projection 46 protrudes from the side 42b in the negative Y-axis direction (towards the secondary sliding door 30).

[0053] In the example shown in Figure 8, the cover projection 46 is part of the frame of the vertical frame 42, and its protruding shape is achieved by bending the frame. However, the cover projection 46 may also be realized from a separate component from the frame of the vertical frame 42. In this case, the cover projection 46 is realized by fixing the separate component to the side surface 42b formed by the frame of the vertical frame 42.

[0054] The cover body 47 is provided on the door-edge side of the side surface 42b. Like the cover projection 46, the cover body 47 extends along the Z-axis direction on the side surface 42b. Unlike the frame of the vertical frame 42, the cover body 47 is made of a soft material, such as rubber or silicone.

[0055] The cover body 47 protrudes toward the sliding door 30, and as shown in Figure 8, when the vertical frame 42 and the vertical frame 31 on the leading edge side of the sliding door 30 overlap, it abuts against a part of the side surface 31a of the vertical frame 31 on the leading edge side of the sliding door 30 that faces the main sliding door 40.

[0056] Here, a portion of the side surface 31a of the vertical frame 31 is the cover projection 38 shown in Figure 8, which protrudes from the side surface 31a in the positive Y-axis direction (towards the main sliding door 40). The cover body 47 abuts against the side of this cover projection 38 on the door-end side.

[0057] In this way, the cover body 47 abuts against the side of the door-end portion of the cover projection 38, thereby achieving both sound insulation and light leakage prevention.

[0058] Incidentally, the cover body 47 is sized so that it does not come into contact with any area of ​​the side surface 31a of the vertical frame 31 other than the cover projection 38. Therefore, when the main sliding door 40 is slid in the X-axis direction, the cover body 47 remains in a non-contact state while the vertical frame 42 and the vertical frame 31 are sliding past each other in the X-axis direction. As a result, no abnormal noise is generated when the soft material slides along the side surface of the vertical frame when the doors are sliding past each other, and the sliding of the door can be made quiet. Furthermore, even when both of the two sliding doors 30 and 40 shown in Figure 9 are in the closed position, the cover body 47 does not come into contact with the side surface of the vertical frame 31 on the tail end side of the secondary sliding door 30.

[0059] The cover projection 46 is a component that does not come into contact with anything. As shown in Figure 9, when the vertical frames 42 and 32 on the door edge side overlap in the Y-axis direction, and this overlapping area is viewed from the positive X-axis side, the gap between these vertical frames 42 and 32 is narrowed by the amount that the cover projection 46 protrudes, so the gap is not noticeable and a substantial appearance can be created.

[0060] The same configuration as the cover body 47 described above is also provided on the vertical frame 32 on the trailing end side of the sliding door 30. The cover body 37 (Figure 8) provided on the vertical frame 32 abuts against a cover projection 18 provided on a part of the side surface 11a of the vertical frame 11 on the leading end side of the fixed door 10 that faces the sliding door 30. The same configuration as the cover projection 46 described above is also provided as a cover projection 36 on the vertical frame 32 on the trailing end side of the sliding door 30.

[0061] With the above configuration, sound insulation and light leakage prevention can be achieved, and the sliding mechanism can be operated quietly.

[0062] Furthermore, the area where the cover body 47 (and similarly the cover body 37) makes contact does not need to be the cover projection 38 protruding from the door-edge side of the side surface 31a of the vertical frame 31 as described above. A modified example will be explained below using Figure 10. Figure 10 is a modified example showing the case where the two sliding doors 30 and 40 are in the open position, similar to Figure 9.

[0063] In the modified example shown in Figure 10, the cover body 47 abuts against the flexible body 39 provided on the side surface 31a of the vertical frame 31. The cover body 47 and the flexible body 39 can have the same configuration. By the abutment between the cover body 47 and the flexible body 39, sound insulation and light leakage prevention can be achieved at the abutment point. The cover body 47 and the flexible body 39 do not come into contact with anything other than each other. Therefore, as in the example described above, there is no generation of abnormal noise due to sliding.

[0064] Furthermore, in the example shown in Figure 10, there is a stepped portion 11g on the side surface 11a of the frame body of the vertical frame 11 on the door edge side of the fixed door. In this example, the cover body 37 abuts against the stepped portion 11g. By the cover body 37 abutting against the stepped portion 11g, sound insulation and light leakage prevention can be achieved at the contact point.

[0065] As described above, the vertical frames of each door—the fixed door 10, the smaller sliding door 30, and the main sliding door 40—achieve sound insulation and light leakage prevention, while also creating a robust and substantial appearance. Each of the vertical frames 11, 12, 31, 32, 41, 42, and the aforementioned upper frames 33, 43 and lower frames 14, 34, 44 may be frames made of a metal frame material such as steel or aluminum, with a veneer attached to the surface. One example is a wood-grain veneer.

[0066] [Variation] In the above-described embodiment, the projection 80 provided on the lower frame 44 is positioned on the door-edge side of the lower frame 44, that is, directly below or near the door-edge side of the vertical frame 41. However, it is not limited to this. For example, as a modified example, the projection 80 may be positioned in the middle of the length of the lower frame 44 from the door-edge to the door-end.

[0067] Furthermore, if the protrusion 80 is provided in the middle portion of the lower frame 44 in this manner, a configuration (positioning aid) to assist in positioning the main sliding door 40 may be provided on the door-edge side of the lower frame 44. Such a positioning aid may employ a magnetic auxiliary positioning device provided on the floor 500 and the door-edge of the lower frame 44, thereby assisting positioning by magnetic force.

[0068] [Additional Note 1] A sliding door mechanism according to embodiment 1 of the present invention includes a sliding door having an upper frame slidably mounted along a rail provided on the ceiling side and a lower frame with a projection extending toward the floor, wherein the projection is provided on a part of the lower frame, and the floor is provided with a receiving portion capable of accommodating the projection when the sliding door is in the closed position, and a floor surface is provided between the trailing edge of the sliding door in the closed position and the receiving portion.

[0069] According to the above configuration, there is no ground rail between the trailing edge of the sliding door in the closed position and the receiving portion that allows the projection to slide while it is housed. Therefore, it is possible to easily correct the misalignment of the sliding door, which was previously difficult.

[0070] Furthermore, with the above configuration, since there is no ground rail, only the floor surface is visible when the sliding door is open. In addition, there is no concern about the carpet curling or fraying at the boundary with the floor due to the installation of a ground rail, and the appearance is not spoiled.

[0071] In the sliding door mechanism according to aspect 2 of the present invention, the projection may be provided in the intermediate portion of the lower frame or on the door-edge side of the intermediate portion, as described in aspect 1 above.

[0072] According to the above configuration, the leading edge of the sliding door is effectively fixed when it is in the closed position.

[0073] In the sliding door mechanism according to embodiment 3 of the present invention, in embodiment 1 or 2, the receiving portion has an upper surface provided with a groove in which the projection is accommodated, and the groove may be provided with side walls that restrict the movement of the projection.

[0074] According to the above configuration, when the projection is housed in the groove, the movement of the projection is restricted, and consequently the movement of the sliding door is restricted, thereby preventing the sliding door from shifting position.

[0075] In the sliding door mechanism according to aspect 4 of the present invention, in aspect 3 described above, the upper surface of the receiving portion is configured to be flush with the floor surface, and the upper surface may be provided with an insertion hole for inserting a fastener for fixing the receiving portion to a floor structure below the floor surface.

[0076] According to the above configuration, since the upper surface of the receiving portion is flush with the floor surface, a stylish appearance can be achieved.

[0077] Furthermore, since an insertion hole for inserting a fastener is provided on the upper surface of the receiving portion, the protrusion housed in the groove and the fastener do not interfere with each other.

[0078] In the sliding door mechanism according to aspect 5 of the present invention, in aspect 3 or 4 described above, the end of the groove may be configured such that the groove width widens towards the end.

[0079] According to the above configuration, since the end of the groove is wide, even if the leading edge of the sliding door shifts slightly when the sliding door slides from the open position to the closed position, the protrusion can be inserted into the wide end of the groove, and the protrusion can be guided toward the back of the groove in the direction of extension.

[0080] [Additional Note 2] The present invention is not limited to the embodiments described above, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. [Explanation of symbols]

[0081] 1 Receiving part 2 Top side 3 grooves 7 side wall 8 Insertion holes 10 Fixed Doors 20 Double sliding doors 30 Small sliding door 40. Parent sliding door (sliding door) 11,12,31,32,41,42 Vertical frame 33,43 Upper frame 34,44 Lower frame 72 Guide Rollers 76 Mounting hardware 77. Second guide roller 80 Protrusion 81 Wheel section 82. Biasing means 100 Sliding door mechanism 500 floor (floor surface) 600 ceiling 601 Rail

Claims

1. A sliding door mechanism including a sliding door having an upper frame that is slidably mounted along a rail provided on the ceiling side and a lower frame with a projection extending toward the floor, The aforementioned projection is provided on a part of the lower frame, The floor is provided with a receiving portion capable of accommodating the protrusion when the sliding door is in the closed position, and a floor surface is provided between the door edge of the sliding door in the closed position and the receiving portion. Sliding door mechanism.

2. The aforementioned projection is provided in the middle portion of the lower frame or on the door-edge side of the middle portion. The sliding door mechanism according to claim 1.

3. The receiving portion has an upper surface provided with a groove in which the projection is accommodated. The groove is provided with a side wall that restricts the movement of the projection. The sliding door mechanism according to claim 1.

4. The upper surface of the receiving portion is configured to be flush with the floor surface. The upper surface is provided with an insertion hole for inserting a fastener for fixing the receiving portion to a floor structure below the floor surface. The sliding door mechanism according to claim 3.

5. The end of the groove widens towards the end. The sliding door mechanism according to claim 3.

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