JP5447879B2 - Sliding door interlocking device - Google Patents

Description

  The present invention relates to a sliding door interlocking device.

  Conventionally, a double sliding door provided with an interlocking device using a wire has been proposed (see Patent Document 1).

Japanese Patent Laid-Open No. 2006-233597

  However, the conventional sliding door interlocking device has a drawback that the wire may be loosened and detached, and failures frequently occur. In addition, maintenance to adjust the tension of the wire periodically is necessary to prevent failure. Such maintenance is a troublesome task and wastes a lot of time and effort.

  Accordingly, an object of the present invention is to provide a sliding door interlocking device that can be used for a long time without troublesome maintenance.

The sliding door interlocking device according to the present invention is a sliding door interlocking device capable of opening and closing by interlocking the two first sliding doors and the second sliding doors suspended movably on the upper frame. a fixed rack provided in a position and a moving rack secured to the upper Symbol second sliding door, comprising a first gear member in mesh with the fixed rack, and a second gear member meshing with the moving rack, the A reduction gear member that is integrally connected to the first gear member and rotates about the same rotation axis is attached to the first sliding door, and the number of teeth of the first gear member and the second gear member is set. The number of teeth of the speed reduction gear member is ½ times that of the first gear member and the second gear member, and the first gear member and the second gear member are shifted vertically with a height difference. The first sliding door is disposed and meshed with the second gear member in the reduction gear member. Those constructed as the second sliding door is opened and closed moves in conjunction with the differential travel allowance.

Further, in the sliding door interlocking device having a door at the lower end and capable of opening and closing the two first sliding doors and the second sliding doors that are movable, the sliding door interlocking device is provided at a predetermined fixed position on the upper frame side. A fixed rack; a movable rack fixed to the second sliding door; and a first gear member meshing with the fixed rack, a second gear member meshing with the movable rack, and the first gear member. A reduction gear member that is connected in the shape of a shaft and rotates about the same rotation axis is attached to the first sliding door, and the number of teeth of the first gear member and the second gear member is the same and the reduction gear The number of teeth of the gear member is 1/2 times that of the first gear member and the second gear member, and the first gear member and the second gear member are vertically displaced with a height difference to arrange the speed reduction. to use the gear member is meshed with said second gear member, said first sliding door and the second sliding door Those configured to open and close moves in conjunction with the differential line charges.

In addition, in the sliding door interlocking device capable of opening and closing the two first sliding doors and the second sliding doors suspended movably on the upper frame, a fixed rack provided at a predetermined fixing position on the upper frame side And a moving rack fixed to the first sliding door, and a first gear member meshing with the fixed rack, a second gear member meshing with the moving rack, and a reduction gear member, Attach to two sliding doors, make the number of teeth of the first gear member and the second gear member the same, and reduce the number of teeth of the speed reduction gear member to 1/2 the number of the first gear member / second gear member The first gear member and the reduction gear member are engaged with each other, and the reduction gear member and the second gear member are interlocked via a connecting mechanism, so that the first sliding door and the second sliding door are allowed to travel. Are configured to open and close in conjunction with each other.
Further, in the sliding door interlocking device having a door at the lower end and capable of opening and closing the two first sliding doors and the second sliding doors that are movable, the sliding door interlocking device is provided at a predetermined fixed position on the upper frame side. A fixed rack; a movable rack fixed to the first sliding door; and a first gear member that meshes with the fixed rack, a second gear member that meshes with the movable rack, and a reduction gear member. It is attached to the second sliding door, the number of teeth of the first gear member and the second gear member is the same, and the number of teeth of the speed reduction gear member is 1 / of that of the first gear member / second gear member. And the first gear member and the speed reduction gear member are engaged with each other, and the speed reduction gear member and the second gear member are interlocked via a connecting mechanism so that the first sliding door and the second sliding door are It is configured to open and close in conjunction with the travel cost differentially .

  According to the sliding door interlocking device of the present invention, the fixed rack, the movable rack, and the gear group can be reliably engaged with each other to interlock the plurality of sliding doors, so that there is no failure and durability can be improved. Therefore, troublesome maintenance can be omitted. In addition, the structure is simple, manufacture and installation are easy, and costs can be reduced.

It is the simple top view which showed the fully open state of one Embodiment of this invention. It is the simplified top view which showed the closed state of one Embodiment of this invention. It is a principal part enlarged plan view of a sliding door interlocking device. It is a principal part expanded sectional front view of a sliding door interlocking device. It is a principal part expanded sectional side view of a sliding door interlocking device. It is the simplified top view which showed the full open state of other embodiment of this invention. It is the simplified top view which showed the closed state of other embodiment of this invention. It is a principal part expanded sectional front view of other embodiment. It is the simplified top view which showed the full open state of another embodiment of this invention. It is a principal part expanded sectional front view of another embodiment. It is a principal part expanded sectional side view of another embodiment.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments.
As shown in FIGS. 1 and 2, the sliding door interlocking device of the present invention includes two first sliding doors 1 suspended movably on an upper frame 30 installed at an entrance of a house, a building, a warehouse, a storeroom or the like. This is a sliding door interlocking device that allows the second sliding door 2 to be opened and closed in conjunction with each other. The sliding door interlocking device of the present invention includes a fixed rack 3 provided at a predetermined fixed position on the upper frame 30 side, and a movable rack 4 fixed to the first sliding door 1 or the second sliding door 2 (any one). A gear group 10 is provided that meshes with the fixed rack 3 and the movable rack 4 to interlock the traveling allowances of the two first sliding doors 1 and 2 while differentially driving.

The first sliding door 1 has its width dimension W ₁ set slightly larger than ½ times the width dimension W ₀ of the entrance / exit, and the second sliding door 2 has its width dimension W ₂ equal to the width dimension W of the entrance / exit. The size is set to about ½ times ₀ . Most of the first sliding doors 1 and the second sliding doors 2 can be accommodated in a door pocket 40 having a depth that is approximately ½ times the width dimension W ₀ of the doorway. In FIG. 1 and FIG. 2, the gear group 10 is disposed on the first sliding door 1 (near the rear end) provided with the drawer handle H out of the two first sliding doors 1 and 2. A movable rack 4 is fixed to a second sliding door 2 that follows the first sliding door 1. Further, the first sliding door 1 is provided with an elastic pad member 18 for reducing the impact.
The fixed rack 3 and the movable rack 4 are made of prismatic metal or hard resin, and gear teeth are formed on one surface. The fixed rack 3 is provided over a predetermined width dimension W ₃ from the inside of the door pocket 40 to about half of the width dimension W ₀ of the entrance / exit, and the movable rack 4 is slightly shorter than the width dimension W ₂ of the second sliding door 2. It provided across the width dimension W _4.
The gear group 10 is formed by combining a plurality of gears. Although described later detailed configuration, gear train 10, the running cost dimension R ₁ of the first sliding door 1, while the differential travel allowance dimensions R ₂ of the second sliding door 2 as ½ ( see FIG. 2), the first sliding door 1 the two and in conjunction with the second sliding door 2 and the lead-possible storage, first the sliding door 1 and the second sliding door 2 is configured to open and close across the width dimension W ₀ of the doorway ing.

Specifically, as shown in FIGS. 3 to 5, the gear group 10 includes a first gear member 11 that meshes with the fixed rack 3 and a second gear member 12 that meshes with the movable rack 4. Yes.
The first gear member 11 and the second gear member 12 are formed with the same number of teeth. Between the first gear member 11 and the second gear member 12, a reduction gear member 13 having a number of teeth that is 1/2 times that of the first gear member 11 and the second gear member 12 is interposed.
Further, the first gear member 11 and the second gear member 12 is disposed side by side in a substantially serial manner along the drawing direction of arrow F ₁ (first traveling direction of the sliding door 1), and, with a predetermined height difference D They are arranged shifted in the vertical direction.

3 to 5, the first gear member 11 and the reduction gear member 13 meshing with the fixed rack 3 are integrally connected so as to rotate around the same rotation axis L ₁ , and the reduction gear member. 13 is engaged with the second gear member 12.
The first gear member 11 and the reduction gear member 13 are integrally formed in a two-stage gear shape formed by connecting two spur gears having different sizes. The first gear member 11 and the reduction gear member 13 are pivotally supported by a shaft 15 and are attached to the upper surface portion of the rear end of the first sliding door 1. The second gear member 12 is formed of a spur gear, is pivotally supported by a shaft 16, and is attached to the upper surface portion of the rear end of the first sliding door 1. That is, when the first gear member 11 and the reduction gear member 13 rotate at the rotation speed N ₁ , the second gear member 12 that meshes with the reduction gear member 13 rotates at a speed that is 1/2 times that of the first gear member 11. It is configured to rotate at N ₂ . The shafts 15 and 16 are attached with collar members 41 and 41 for preventing shaft shake.

As shown in FIG. 5, the first sliding door 1 and the second sliding door 2 are suspended in a vertical plane by suspension rails 33, 33 on guide rails 31, 32 fixed to the upper frame 30. The suspension wheels 33 and 33 are disposed at positions vertically above the center of gravity G of the first sliding door 1 and the second sliding door 2.
The upper frame 30 has a rack holding member 35 that is formed in a stepped shape and attached outwardly from the upper surface thereof. The upper frame 30 firmly holds the guide rail 31 on the first vertical surface 34A and the guide rail 32 on the second vertical surface 34B formed below the first vertical surface 34A. The guide rails 31 and 32 support the suspension wheels 33 and 33 so that they can run freely. The suspension wheels 33 and 33 have the first sliding door 1 and the second sliding door 2 fixed to the lower ends of the suspension members 36 and 36 with bolts or the like, and pass through the center of gravity G of the first sliding door 1 and the second sliding door 2. _On the extension line of the vertical lines V ₁ and V ₂ , the load is applied to the first sliding door 1 and the second sliding door 2 in contact with the guide rails 31 and 32. The fixed rack 3 is fixed to the inner surface of the rack holding member 35. The suspension wheel 33 that supports the second sliding door 2 has the movable rack 4 fixed to the inner surface of the suspension member 36.

Next, another embodiment of the sliding door interlocking device of the present invention will be described.
As shown in FIGS. 6-8, in other embodiment of this invention, the movable rack 4 is attached to the 1st sliding door 1 which attached the handle H for drawer among the two 1st sliding doors 1 and 2 of the 2nd sliding doors. The gear group 10 is disposed on the second sliding door 2 while being fixed.
The fixed rack 3 is provided inside the door pocket 40, and the movable rack 4 is provided so as to be slightly shorter than the width dimension W ₁ of the first sliding door 1. Gear group 10, the running cost dimension _{R 1} of the first sliding door 1, while the differential travel allowance dimensions _{R 2} of the second sliding door 2 as ½ (see FIG. 2), two first The sliding door 1 and the second sliding door 2 can be pulled out and stored in conjunction with each other, and the first sliding door 1 and the second sliding door 2 are configured to open and close over the width W _{0 of the} entrance / exit.
The gear group 10 is the same as the above-described embodiment in that it is configured by combining a plurality of gears, and meshes the first gear member 11 and the reduction gear member 13 that mesh with the fixed rack 3, The speed reduction gear member 13 and the second gear member 12 are interlocked via a coupling mechanism 14.

In other embodiment, the 1st gear member 11 consists of a spur gear, and is attached to the rear-end upper surface part of the 2nd sliding door 2. As shown in FIG. The second gear member 12 is formed of a spur gear and is attached to the upper surface of the front end of the second sliding door 2. A bevel gear 19 is integrally formed at the upper end of the shaft 17 that pivotally supports the second gear member 12. The reduction gear member 13 is formed of a spur gear having half the number of teeth of the first gear member 11 and the second gear member 12, and is attached to mesh with the first gear member 11. A bulk gear 20 is integrally formed at the upper end of the shaft 21 that supports the reduction gear member 13.
The first gear member 11, the second gear member 12, and the reduction gear member 13 are arranged substantially in series along the arrow F ₂ direction (the traveling direction of the second sliding door 2) in the drawing. Yes.

Although not shown in FIGS. 6 and 7, as shown in FIG. 8, the connecting mechanism 14 has a connecting member 5 that rotates the bevel gears 19 and 20 in the opposite direction in conjunction with each other. . The connecting member 5 includes a connecting shaft 6 pivotally mounted around a horizontal axis H ₀ and a pair of bevel gears 26 and 27 pivotally supported on the connecting shaft 6. The bevel gear 26 meshes with the bevel gear 19 that rotates integrally with the reduction gear member 13, and the bevel gear 26 meshes with the bevel gear 19 that rotates integrally with the second gear member 12. doing. That is, the second gear member 12 and the reduction gear member 13 are rotated in the opposite directions in conjunction with each other by the coupling mechanism 14, and the first gear member 11 that meshes with the reduction gear member 13 is the second gear member 12. It is configured to rotate at a rotational speed that is 1/2 times the rotational speed.

Next, another embodiment of the sliding door interlocking device of the present invention will be described.
As shown in FIGS. 9 and 10, another embodiment of the present invention is configured such that the movable rack 4 is attached to the first sliding door 1 provided with the drawer handle H out of the two first sliding doors 1 and 2. At the same time, the gear group 10 is disposed in the second sliding door 2, the first gear member 11 meshing with the fixed rack 3 and the reduction gear member 13 are engaged, and the reduction gear member 13 and the second gear member 12 are engaged. Are configured in the same manner as in the other embodiments described above in that they are interlocked via the connecting mechanism 14.
9 and 10, the coupling mechanism 14 connects the screw gear 22 that rotates integrally with the second gear member 12, the screw gear 23 that rotates integrally with the reduction gear member 13, and the screw gears 22, 23 to each other. It has a connecting member 25 that rotates in the reverse direction in conjunction with it. The connecting member 25 includes a connecting shaft 24 pivotally mounted around the horizontal axis H ₀ and a pair of screw gears 28 and 29 pivotally supported by the connecting shaft 24. The screw gear 29 meshes with the screw gear 23 that rotates integrally with the reduction gear member 13, and the screw gear 28 meshes with the screw gear 22 that rotates integrally with the second gear member 12. That is, the second gear member 12 and the reduction gear member 13 are rotated in the opposite directions in conjunction with each other by the coupling mechanism 14, and the first gear member 11 that meshes with the reduction gear member 13 is the second gear member 12. It is configured to rotate at a rotational speed that is 1/2 times the rotational speed.
The first gear member 11, the second gear member 12, and the reduction gear member 13 are arranged substantially in series along the arrow F ₂ direction (the traveling direction of the second sliding door 2) in the drawing. Yes.

As shown in FIG. 11, the first sliding door 1 and the second sliding door 2 have door wheels 43, 43 at the lower ends, travel movably on rail members 42 laid on the floor surface, and the gear group 10 ( (Not shown in the figure).
Tilt prevention means 44 and 44 are provided at the upper ends of the first sliding door 1 and the second sliding door 2. The tilt prevention means 44 includes a guide rail member 45 and a slide member 46 supported so as to be slidable along the guide rail member 45. One tilt prevention means 44 is interposed between the first sliding door 1 and the second sliding door 2, and is for a guide attached to the slide member 46 attached to the first sliding door 1 side and the second sliding door 2 side. The rail member 45 is engaged. Further, the other tilt prevention means 44 is interposed between the upper frame 30 and the second sliding door 2, and is a guide member attached to the slide member 46 attached to the second sliding door 2 side and the upper frame 30 side. The rail member 45 is engaged.

The use method (action) of the above-described sliding door interlocking device of the present invention will be described.
As shown in FIG. 1, the first sliding door 1 of the two and the second sliding door 2 in a state of being housed in the door pocket 40, press lightly first sliding door 1 of the handle H, is moved in direction of arrow F _1. At this time, the fixed rack 3 fixed to the upper frame 30 and the first gear member 11 mesh with each other, and a rotational force is applied to the first gear member 11 as the first sliding door 1 is pulled out. The rotational force of the first gear member 11, second gear member 12 is transmitted with speed reduction through the reduction gear member 13, half the number of rotations N ₁ of the first gear member 11 Rotating at N ₂ , a moving force (1/2 times that of the first sliding door 1) is applied in the direction of arrow F ₂ to the second sliding door 2 to which the movable rack 4 is attached. In this way, the running cost dimension R ₁ of the first sliding door 1, a first sliding door 1 while the differential travel allowance dimensions R ₂ of the second sliding door 2 as the half second sliding door 2 is interlocked Then pulled out.

  In the sliding door interlocking device of the present invention, the fixed rack 3 / movable rack 4 and the first gear member 11 / second gear member 12 can reliably be free from play from the fully open state of FIG. 1 to the closed state of FIG. The first sliding door 1 and the second sliding door 2 are stably and smoothly interlocked to withstand long-term use without requiring maintenance. Moreover, also when returning from a closed state to a full open state, it is possible to hold | maintain the driving allowance of the 1st sliding door 1 and the 2nd sliding door 2 in the relationship of 2: 1, and to make it interlock | cooperate.

  Note that the design of the present invention can be changed within a range not departing from the gist. For example, in the embodiment shown in FIG. 1 to FIG. 4 and FIG. 6 to FIG. 8, the first sliding door 1 and the second sliding door 2 have the suspension wheels 33 and 33 of FIG. 9 or 10, and in the embodiment shown in FIGS. 9 to 10, the structure having either the suspension wheel 33 or 33 of FIG. 5 or the door wheel 43 or 43 of FIG. 11. It is also good.

  As described above, the sliding door interlocking device according to the present invention is a sliding door interlocking device that can open and close the two first sliding doors 1 and 2 suspended from the upper frame 30 in a movable manner. A fixed rack 3 provided at a predetermined fixed position on the upper frame 30 side, and a movable rack 4 fixed to the first sliding door 1 or the second sliding door 2, and meshes with the fixed rack 3 and the movable rack 4. Since the gear group 10 that interlocks the two first sliding doors 1 and the second sliding door 2 while differentially moving is provided, the fixed rack 3 and the movable rack 4 and the gear group 10 are surely engaged with each other so that the two The first sliding door 1 and the second sliding door 2 can be interlocked smoothly and stably, there is no failure, and durability can be improved. Therefore, it can withstand long-term use by omitting troublesome maintenance. In addition, the structure is simple, manufacture and installation are easy, and costs can be reduced.

  Further, in the sliding door interlocking device having a door at the lower end and capable of opening and closing the first sliding door 1 and the second sliding door 2 traveling in a movable manner, a predetermined fixed position on the upper frame 30 side is provided. The fixed rack 3 provided and the movable rack 4 fixed to the first sliding door 1 or the second sliding door 2 are provided. The fixed rack 3 and the movable rack 4 are meshed with each other, and the two first sliding doors 1 and 2 Since the gear group 10 that interlocks the sliding allowance of the sliding door 2 while being differentially provided, the fixed rack 3, the movable rack 4, and the gear group 10 are surely engaged with each other so that the two first sliding doors 1 and 2 are connected. It can be linked smoothly and stably, has no failure, and can improve durability. Therefore, it can withstand long-term use by omitting troublesome maintenance. In addition, the structure is simple, manufacture and installation are easy, and costs can be reduced.

  The gear group 10 includes a first gear member 11 that meshes with the fixed rack 3 and a second gear member 12 that meshes with the movable rack 4, and the teeth of the first gear member 11 and the second gear member 12. A reduction gear member 13 having the same number of gears and having half the number of teeth of the first gear member 11 and the second gear member 12 is interposed between the first gear member 11 and the second gear member 12. Therefore, the second sliding door 2 can be moved to the first sliding door 1 while decelerating to 1/2 times the speed, and the first sliding door 1 and the second sliding door 2 can be made smooth and stable. Can be linked.

In addition, the gear group 10 is disposed on the first sliding door 1 provided with the drawer handle H out of the two first sliding doors 1 and 2, and the movable rack 4 is fixed to the second sliding door 2. The first gear member 11 and the reduction gear member 13 meshing with the fixed rack 3 are integrally connected so as to rotate around the same rotation axis L ₁ , and the second gear member 12 is connected to the reduction gear member 13. Since the first sliding door 1 and the second sliding door 2 are configured to open and close in conjunction with each other while differentially traveling, the simple structure (from the fully open state to the closed state) The 1st sliding door 1 and the 2nd sliding door 2 can be made to interlock | cooperate reliably, manufacture and installation become easy and cost can be reduced.

  The movable rack 4 is fixed to the first sliding door 1 provided with the drawer handle H out of the two first sliding doors 1 and 2, and the gear group 10 is disposed on the second sliding door 2. The first gear member 11 and the speed reduction gear member 13 that mesh with the fixed rack 3 are meshed with each other, and the speed reduction gear member 13 and the second gear member 12 are interlocked with each other via the connecting mechanism 14 so that the first sliding door 1 and the first gear Since the two sliding doors 2 are configured to open and close in conjunction with the travel cost differentially, the first sliding door 1 and the second sliding door 2 can be reliably connected with a simple structure (from the fully open state to the closed state). It can be linked, making manufacture and installation easy and reducing costs.

  Moreover, since the 1st gear member 11 and the 2nd gear member 12 are arrange | positioned along with the advancing direction of the 1st sliding door 1 and the 2nd sliding door 2 in the substantially serial form, Can be designed in a compact manner and can be reliably engaged with each other.

  The first sliding door 1 and the second sliding door 2 are suspended on guide rails 31 and 32 fixed to the upper frame 30 in a vertical plane via suspension wheels 33 and 33. The sliding door 1 and the second sliding door 2 are arranged vertically above the center of gravity G of the sliding door 1 so that the whole can be designed compactly and reliably interlocked while supporting the first sliding door 1 and the second sliding door 2 in a well-balanced manner. Can be made.

DESCRIPTION OF SYMBOLS 1 1st sliding door 2 2nd sliding door 3 Fixed rack 4 Moving rack 10 Gear group 11 1st gear member 12 2nd gear member 13 Reduction gear member 14 Connection mechanism 30 Upper frame 31 Guide rail 32 Guide rail 33 Suspension wheel H Drawer handle L ₁ axis of rotation G Center of gravity
D Height difference

Claims (4)

In the sliding door interlocking device which can open and close the two first sliding doors (1) and the second sliding door (2) which are suspended movably on the upper frame (30),
The upper frame (30) side of the fixed rack provided at a predetermined fixed position (3) and a moving rack secured to the upper Symbol second sliding door (2) (4), provided with said fixed rack (3) The first gear member (11) meshing with the movable rack (4), the second gear member (12) meshing with the movable rack (4), and the same rotating shaft ( L ₁ ) A reduction gear member (13) rotating around is attached to the first sliding door (1), and the number of teeth of the first gear member (11) and the second gear member (12) is set. And the number of teeth of the reduction gear member (13) is ½ times that of the first gear member (11) and the second gear member (12),
The first gear member (11) and the second gear member (12) are vertically displaced with a height difference (D) to dispose the second gear member (12) on the reduction gear member (13). The sliding door interlocking device is configured such that the first sliding door (1) and the second sliding door (2) are opened and closed in conjunction with each other while differentially traveling . In a sliding door interlocking device having a door at the lower end and capable of opening and closing the two first sliding doors (1) and the second sliding door (2) that move freely,
An upper frame (30) side of the fixed rack provided at a predetermined fixed position (3) and a moving rack secured to the upper Symbol second sliding door (2) (4), comprising, on the fixed rack (3) The first gear member (11) that meshes, the second gear member (12) that meshes with the movable rack (4), and the same rotational axis (L) that is integrally connected to the first gear member (11). ₁ ) A reduction gear member (13) rotating around is attached to the first sliding door (1), and the number of teeth of the first gear member (11) and the second gear member (12) is the same. And the number of teeth of the reduction gear member (13) is ½ times that of the first gear member (11) and the second gear member (12),
The first gear member (11) and the second gear member (12) are vertically displaced with a height difference (D) to dispose the second gear member (12) on the reduction gear member (13). The sliding door interlocking device is configured such that the first sliding door (1) and the second sliding door (2) are opened and closed in conjunction with each other while differentially traveling . In the sliding door interlocking device which can open and close the two first sliding doors (1) and the second sliding door (2) which are suspended movably on the upper frame (30),
A fixed rack (3) provided at a predetermined fixed position on the upper frame (30) side; and a movable rack (4) fixed to the first sliding door (1), and the fixed rack (3) A first gear member (11) that meshes, a second gear member (12) that meshes with the movable rack (4), and a reduction gear member (13) are attached to the second sliding door (2). The first gear member (11) and the second gear member (12) have the same number of teeth, and the reduction gear member (13) has the same number of teeth as the first gear member (11) and the second gear. ½ times the member (12)
The first gear member (11) and the reduction gear member (13) are engaged with each other, and the reduction gear member (13) and the second gear member (12) are interlocked via a coupling mechanism (14). The sliding door interlocking device is configured such that the first sliding door (1) and the second sliding door (2) are opened and closed in conjunction with each other while differentially traveling . In a sliding door interlocking device having a door at the lower end and capable of opening and closing the two first sliding doors (1) and the second sliding door (2) that move freely,
A fixed rack (3) provided at a predetermined fixed position on the upper frame (30) side; and a movable rack (4) fixed to the first sliding door (1), and meshed with the fixed rack (3) A first gear member (11), a second gear member (12) meshing with the movable rack (4), and a reduction gear member (13) are attached to the second sliding door (2); The first gear member (11) and the second gear member (12) have the same number of teeth, and the reduction gear member (13) has the same number of teeth as the first gear member (11) and the second gear member. 1/2 of (12)
The first gear member (11) and the reduction gear member (13) are engaged with each other, and the reduction gear member (13) and the second gear member (12) are interlocked via a coupling mechanism (14). The sliding door interlocking device is configured such that the first sliding door (1) and the second sliding door (2) are opened and closed in conjunction with each other while differentially traveling .

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