Door opening / closing device and workspace expansion unit

Abstract

To provide a door opening and closing device that can reliably secure a workspace for maintenance regardless of the condition of the installation site on the building side. [Solution] The door opening and closing device comprises a door drive unit 11, a door control unit 12, a case 13, and an inspection hatch cover 27. The door drive unit 11 drives the door 3 to open and close. The door control unit 12 controls the door drive unit 11. The case 13 has an equipment housing section 21 and a work space section 22. The equipment housing section 21 houses the door drive unit 11 and the door control unit 12 at a position above the ceiling panel 23 of the building in which the door 3 is installed. The work space section 22 communicates with the equipment housing section 21 at a position above the ceiling panel 23. The case 13 has an inspection hatch 40 below the work space section 22. The inspection hatch cover 27 is connected to the lower end of the case 13 and closes the inspection hatch 40 so that it can be opened and closed.

Description

Technical Field

[0001] The present invention relates to a door opening / closing device and a work space expansion unit.

Background Art

[0002] An automatic door installed at an entrance of a building includes a door attached to the entrance and a door opening / closing device for opening and closing the door. The door opening / closing device includes a door driving unit that drives the door to open and close, and a door control unit that controls the door driving unit. These are installed above the entrance while being housed in a case. The door driving unit includes a guide rail arranged along the door opening / closing direction above the entrance, a door hanger that is suspended and supported so as to be rollable on the guide rail, a feed belt connected to the door hanger, and an electric motor (drive engine) that moves the feed belt.

[0003] In many of this type of door opening / closing devices, a case housing the door driving unit and the door control unit is fixedly installed on the upper frame above the entrance. And the upper frame and the case of the door opening / closing device are usually installed at a position lower than the ceiling (ceiling board) of the building. An inspection port is provided on the vertical wall of the case facing the indoor side, and the inspection port is closed by an inspection port cover that can be opened and closed (see, for example, Patent Document 1).

[0004] In the door opening / closing device described in Patent Document 1, since the inspection port is provided on the vertical wall of the case facing the indoor side, the door driving unit and the door control unit in the case can be easily inspected by opening the inspection port cover from the indoor side.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] Most door opening and closing devices installed at building entrances are positioned lower than the building's ceiling (ceiling panel). However, in cases where the building's ceiling is low or the door itself is tall, part of the case housing the door drive and control units may be installed inside the ceiling (in the space above the ceiling panel) to improve the exterior design.

[0007] The door opening and closing device described in Patent Document 1 has an inspection opening on the vertical wall of the case facing the interior, for inspecting the equipment inside the case (door drive unit and door control unit). Therefore, when a part of the case is installed inside the ceiling (space above the ceiling panel), space must be secured outside the inspection opening for workers to perform their duties. However, depending on the size of the installation opening in the ceiling of the building and the condition of the space above the ceiling, it can be difficult to secure a stable workspace for performing maintenance work through the inspection opening.

[0008] The present invention provides a door opening and closing device and a workspace expansion unit that can stably secure a workspace for maintenance regardless of the conditions of the installation site on the building side. [Means for solving the problem]

[0009] A door opening and closing device according to one aspect of the present invention comprises: a door drive unit for driving a door to open and close; a door control unit for controlling the door drive unit; a case having an equipment housing unit that houses the door drive unit and the door control unit at a position above the ceiling panel of a building on which the door is installed, and a working space unit that communicates with the equipment housing unit at a position above the ceiling panel, and an inspection opening provided below the working space unit; and an inspection opening cover connected to the lower end of the case that closes the inspection opening so that it can be opened and closed.

[0010] In the door opening and closing device according to this embodiment, a device housing section and a work space section communicating with the device housing section are provided in the case, and an inspection opening located below the work space section is closed by an inspection opening cover. Therefore, by opening the inspection opening cover at the bottom of the case, the device inside the device housing section can be easily inspected through the work space section inside the case. Furthermore, in the door opening and closing device according to this embodiment, the inspection hatch cover is connected to the lower end of the case so that the inspection hatch can be opened and closed. Therefore, the inspection hatch cover can be reliably opened and closed regardless of the size of the installation opening formed in the ceiling panel of the building or the condition of the space above the ceiling panel. Consequently, a stable workspace for maintenance can be secured regardless of the condition of the installation area on the building side.

[0011] The inspection hatch cover may also be further provided with an opening fixing mechanism that holds it in the open position.

[0012] In this case, the opening locking mechanism can hold the inspection hatch cover open, ensuring that the inspection hatch remains open and allowing maintenance work on the equipment inside the case to be performed.

[0013] The inspection hatch cover is rotatably supported on the edge of the inspection hatch, and the opening fixing portion is positioned inside the case and has a restricting piece that, when the inspection hatch cover is open, at least a portion of it protrudes below the ceiling plate, and the restricting piece may restrict the rotation of the inspection hatch cover in the closing direction when at least a portion of it protrudes below the ceiling plate.

[0014] In this case, despite its simple structure, the inspection hatch cover can be reliably kept open. Furthermore, when the inspection hatch cover is closed, the restricting piece can be stored inside the case. Therefore, the appearance quality when the inspection hatch cover is closed can be improved.

[0015] The case comprises a case body that forms the equipment housing section and an extension case that forms the workspace section and to which the inspection port cover is connected at the lower end, and the extension case may be detachably attached to the case body.

[0016] In this case, by preparing expansion cases of different sizes, the most suitable expansion case can be attached to the main case depending on the environment of the building where it will be installed. Furthermore, a door opening and closing device can be manufactured using a main case with the same specifications as an existing door opening and closing device that does not have an expansion case, and then by attaching an expansion case to that main case. Therefore, adopting this configuration can increase production efficiency.

[0017] The equipment housing is positioned to face the door in the vertical direction, the equipment housing and the work space are arranged side by side along the horizontal direction, the equipment housing is positioned closer to the door than the work space, and the inspection hatch cover is rotatably mounted around a pivot axis provided on the equipment housing side of the inspection hatch, the pivot axis may be oriented horizontally.

[0018] In this case, with the inspection hatch cover open, a worker can reach their hand into the work area from the side of the cover facing the work space. This improves the efficiency of construction and maintenance work.

[0019] The inspection hatch cover is connected to the case via a connecting member having a rotating shaft, and the connecting member may be positioned above the inspection hatch cover in the vertical direction when the inspection hatch cover is closed over the inspection hatch.

[0020] In this case, when the inspection hatch cover is closed, the connecting member (hinges, etc.) is covered by the inspection hatch cover, thus improving the aesthetic appearance.

[0021] The inspection port cover and the case may each be provided with a temporary fixing portion that is detachably connected in a state where the inspection port is closed by the inspection port cover.

[0022] In this case, after once closing the inspection port with the inspection port cover using the temporary fixing portion, the inspection port cover can be fixed to the case while finally maintaining the closed state by the inspection port cover using a fixture. Therefore, when closing this inspection port cover, it is no longer necessary for the operator to perform a fixing operation using a fixture while holding the inspection port cover by hand. Thus, the operation of closing the inspection port cover can be facilitated.

[0023] The inspection port cover may be provided with a wiring holding portion that holds wiring used for door opening and closing.

[0024] In this case, it is no longer necessary to directly fix the wiring used for the door opening and closing device inside the case. Since the wiring may be fixed to the wiring holding portion of the open cover, the wiring fixing operation can be performed in front of the operator. Therefore, the assembly workability of the door opening and closing device can be improved.

[0025] The equipment accommodation portion and the work space portion are arranged side by side along the horizontal direction, and the equipment accommodation portion is arranged on the door side rather than the work space portion. Among the cases, a support portion is provided on the side surface of the equipment accommodation portion opposite to the work space portion and below. When the first direction is the direction in which the equipment accommodation portion and the work space portion are aligned in a state where the inspection port cover closes the inspection port, the support portion may support the side toward the equipment accommodation portion from the center in the first direction of the inspection port cover.

[0026] In this case, a closed cross-sectional structure (a structure in which the cross-section is in a frame shape) can be formed by the case, the support portion (bracket), and the inspection port cover that closes the inspection port. Therefore, the rigidity of the case can be increased, and deformation in which the work space portion side of the case falls downward can be suppressed.

[0027] The door drive unit comprises a rail arranged along the opening and closing direction of the door, and a door hanger having rollers that roll on the rail and suspending and supporting the door from the rail, wherein the support unit may be fixed to the rail.

[0028] In this case, the bracket can be fixed using the rail without needing to prepare separate parts for fixing the bracket. This allows for a simpler door opening and closing mechanism.

[0029] A workspace expansion unit according to one aspect of the present invention comprises a door drive unit for driving a door to open and close, a door control unit for controlling the door drive unit, and a case body for housing the door drive unit and the door control unit inside, wherein the door drive unit and the door control unit are used in a door opening and closing device located above the ceiling panel of a building on which the door is installed, and further comprises an expansion case attached to the case body, and an inspection port cover rotatably connected to the lower end of the expansion case and closing the inspection port so as to be openable and closable.

[0030] The workspace expansion unit according to this embodiment has a workspace section in the expansion case that communicates with the inside of the case body, and an inspection opening located below the workspace section is openable and closable by an inspection opening cover. By attaching the expansion case to the case body, a door opening and closing device can be manufactured that allows easy inspection of the equipment inside the case body through the lower inspection opening and workspace section. With the door opening and closing device thus manufactured, by opening the lower inspection opening cover of the expansion case, the equipment inside the case body can be easily inspected through the workspace section inside the expansion case. Furthermore, in this embodiment of the workspace expansion unit, the inspection hatch cover is connected to the lower end of the expansion case so that the inspection hatch can be opened and closed. Therefore, the inspection hatch cover can be reliably opened and closed regardless of the size of the installation opening formed in the ceiling panel of the building or the condition of the space above the ceiling panel. Thus, a stable workspace for maintenance can be secured regardless of the condition of the installation area on the building side. Furthermore, by using a case body of the same specifications as existing door opening and closing devices that do not have an expansion case, and attaching a workspace expansion unit to the case body of the same specifications, a door opening and closing device equipped with a workspace, an inspection hatch, and an inspection hatch cover can be manufactured. [Effects of the Invention]

[0031] The aforementioned door opening and closing device ensures a stable workspace for maintenance, regardless of the installation location on the building side.

[0032] According to the aforementioned workspace expansion unit, by attaching the workspace expansion unit to the case body, a stable workspace for maintenance can be secured regardless of the conditions of the installation site on the building side. [Brief explanation of the drawing]

[0033] [Figure 1] Front view of the automatic door according to the embodiment. [Figure 2] A cross-sectional view of a door opening and closing device according to one embodiment, along the line II-II in Figure 1. [Figure 3] A cross-sectional view similar to Figure 2, showing the inspection hatch cover of a door opening / closing device in one embodiment in an open state. [Figure 4] A cross-sectional view similar to Figure 2 of a door opening and closing device of another embodiment. [Figure 5] Furthermore, a cross-sectional view similar to Figure 2 of a door opening and closing device of another embodiment. [Figure 6] Cross-sectional view of the door opening and closing device in the second embodiment. [Figure 7] An enlarged cross-sectional view of section VII of the door opening and closing device shown in Figure 6. [Figure 8] Cross-sectional view of the door opening and closing device in the third embodiment. [Figure 9] Cross-sectional view of the door opening and closing device in the fourth embodiment. [Figure 10] A cross-sectional view of a door opening and closing device in a modified example of the fourth embodiment. [Figure 11] Cross-sectional view of the door opening and closing device in the fifth embodiment. [Figure 12] A cross-sectional view of the door opening and closing mechanism along the line XII-XII in Figure 11. [Figure 13] Cross-sectional view of the door opening and closing device in the sixth embodiment. [Figure 14] This is a cross-sectional view of the door opening and closing device along the line XIV-XIV in Figure 13. [Figure 15] Cross-sectional view of the door opening and closing device in the seventh embodiment. [Figure 16] A cross-sectional view of the door opening and closing mechanism along the line XVI-XVI in Figure 15. [Figure 17] A cross-sectional view of the door opening and closing device in the first modified example of the seventh embodiment. [Figure 18] Cross-sectional view of a door opening and closing device in a second modified example of the seventh embodiment. [Figure 19] Cross-sectional view of the door opening and closing device in the eighth embodiment. [Figure 20] Front view of the binding member in the eighth embodiment. [Figure 21] A cross-sectional view showing the binding member in the opened state in the eighth embodiment. [Figure 22] A cross-sectional view illustrating the operation of attaching the binding member to the wiring support in the eighth embodiment. [Figure 23] A cross-sectional view of the door opening and closing device in the first modified example of the eighth embodiment. [Figure 24] A cross-sectional view of the binding member in a second modified example of the eighth embodiment. [Figure 25] A cross-sectional view showing the binding member in an open state in a second modified example of the eighth embodiment. [Figure 26] A front view of the door opening and closing device in the ninth embodiment, as seen from the interior side. [Figure 27] A cross-sectional view of the door opening and closing mechanism along the line XXVII-XXVII in Figure 26. [Figure 28] Figure 27 is a front view of the door opening and closing mechanism as seen from the inside. [Figure 29] Cross-sectional view of the door opening and closing mechanism along the line XXIX-XXIX in Figure 26. [Figure 30] Figure 29 is a front view of the door opening and closing mechanism as seen from the inside. [Figure 31] A cross-sectional view of the door opening and closing mechanism along the line XXXI-XXXI in Figure 26. [Figure 32] Figure 31 is a front view of the door opening and closing mechanism as seen from the inside. [Figure 33] A front view illustrating an example of removing a pair of bolts from the inspection hatch cover in the ninth embodiment. [Figure 34] A front view illustrating an example of suppressing the downward movement of the inspection hatch cover due to its own weight in the ninth embodiment. [Figure 35] A front view illustrating an example of moving the first bracket along the groove in the ninth embodiment. [Figure 36] A front view illustrating the folded state of the pair of inspection hatch covers in the ninth embodiment. [Figure 37] A cross-sectional view showing a modified example of the ninth embodiment in which the T-slot bolt is supported in the groove. [Figure 38] Cross-sectional view of the door opening and closing device in the 10th embodiment. [Figure 39] A cross-sectional view illustrating the operation of hooking the fixing part of the inspection hatch cover to the support part of the vertical wall in the 10th embodiment. [Figure 40] A cross-sectional view illustrating the operation of fixing the inspection hatch cover to the support and cover fixing wall in the 10th embodiment. [Figure 41] A cross-sectional view illustrating the operation of opening the inspection hatch cover in the tenth embodiment. [Figure 42] A cross-sectional view illustrating the operation of holding the inspection hatch cover in the open position in the tenth embodiment. [Figure 43] Cross-sectional view of the door opening and closing device in the 11th embodiment. [Figure 44] A cross-sectional view illustrating the operation of holding the door opening / closing device inspection hatch cover 27 in the open position in the 11th embodiment. [Figure 45] A cross-sectional view of a door opening and closing device in a modified example of the 11th embodiment. [Figure 46] A cross-sectional view illustrating the operation of opening the inspection hatch cover of the door opening / closing device in a modified example of the 11th embodiment. [Figure 47] A cross-sectional view illustrating the operation of holding the inspection hatch cover of the door opening / closing device in the open position in a modified example of the 11th embodiment. [Modes for carrying out the invention]

[0034] Next, embodiments of the present invention will be described with reference to the drawings. In the embodiments described below, common reference numerals are used to denote identical parts, and some redundant explanations are omitted. Furthermore, the drawing includes arrows indicating the upper (vertically upward) direction of the building (UP) and the outside of entrance 2 of the building (OU) in appropriate places. In the following explanation, the side pointed to by arrow UP will be referred to as the upper side, and the opposite side as the lower side. Also, for the sake of clarity, the side pointed to by arrow OU will be referred to as the exterior side, and the opposite side as the interior side.

[0035] Figure 1 is a front view (viewed from the interior side) of an automatic door 1 in which the door opening / closing device 10 of this embodiment is employed. Figure 2 is a cross-sectional view of the door opening / closing device 10 along the line II-II in Figure 1. As shown in Figure 1, the automatic door 1 comprises a pair of doors 3 installed to open and close at an entrance 2 of a building, and a door opening and closing device 10 for opening and closing the pair of doors 3. The pair of doors 3 are sliding doors and close together in the center of the entrance 2. The pair of doors 3 also open the entrance 2 by moving away from each other from the closed position. In the following, the direction in which door 3 moves at entrance / exit 2 will be referred to as the "door opening / closing direction."

[0036] In this embodiment, the entrance / exit 2 is formed by being surrounded by an upper frame 4 and a lower frame 5 that extend along the door opening and closing direction, and a pair of fixed door sections 6 fixed to the upper frame 4 and the lower frame 5. The pair of fixed door sections 6 are spaced apart from each other in the door opening and closing direction. Note that the location where the fixed door sections 6 are located does not have to be in the form of a door; it may be a wall of a building.

[0037] <Door opening and closing device of the first embodiment> The door opening / closing device 10 is located on the interior side of the upper frame 4 above the doorway 2. The door opening / closing device 10 comprises a door drive unit 11 that drives the door 3 to open and close, a door control unit 12 that controls the door drive unit 11, and a case 13 that houses these components inside. Since the door opening / closing device 10 is located on the interior side of the upper frame 4 above the doorway 2, the door 3 is located on the exterior side of the door opening / closing device 10. In other words, in the following description of the door opening / closing device 10, the exterior side also includes the side of the door 3.

[0038] The door drive unit 11 comprises a long rail 14 positioned above the entrance 2 of the building along the door opening and closing direction, a plurality of door hangers 16 having rollers 15 that roll on the rail 14 and suspending and supporting each door 3 from the rail 14, a feed belt 17 that moves each door hanger 16 along the door opening and closing direction, and an electric motor 18 (drive engine) that drives the feed belt 17. The rail 14 is formed integrally with a part of the wall of the case 13. The rail 14 and the part of the wall of the case 13 are integrally formed from, for example, an aluminum alloy.

[0039] Two door hangers 16 are provided above each door 3, spaced apart in the door opening and closing direction. A drive pulley 19 is positioned above one fixed door section 6 (the right fixed door section 6 in Figure 1), and a driven pulley 20 is positioned above the other fixed door section 6 (the left fixed door section 6 in Figure 1). The drive pulley 19 is connected to the shaft of the electric motor 18 and is supported together with the electric motor 18 on the wall of the case 13. The driven pulley is supported on the wall of the case 13 via a bracket (not shown). The door control unit 12 mainly controls the drive of the electric motor 18.

[0040] The feed belt 17 is made of an endless belt and is stretched between a drive pulley 19 and a driven pulley 20. The feed belt 17 stretched between the drive pulley 19 and the driven pulley 20 has an upper moving section 17u that moves linearly toward one side of the door opening and closing direction when the drive pulley 19 rotates in one direction, and a lower moving section 17l that moves linearly toward the other side of the door opening and closing direction when the drive pulley 19 rotates in the same one direction. When the drive pulley 19 rotates in the other direction, the upper moving section 17u moves linearly toward the other side of the door opening and closing direction, and the lower moving section 17l moves linearly toward one side of the door opening and closing direction.

[0041] The two door hangers 16 supporting the upper part of the left door 3 in Figure 1 are connected to the upper moving section 17u of the feed belt 17. The two door hangers 16 supporting the upper part of the right door 3 in Figure 1 are connected to the lower moving section 17l of the feed belt 17.

[0042] Therefore, for example, as shown in Figure 1, when the drive pulley 19 rotates in one direction by the power of the electric motor 18 from a state where the left and right doors 3 are closed, the left door 3 is pushed to the left by the upper moving part 17u, and the right door 3 is pushed to the right by the lower moving part 17l. As a result, the left and right doors 3 open the entrance 2. Also, when the drive pulley 19 rotates in opposite directions by the power of the electric motor 18 from a state where the left and right doors 3 are open, the left door 3 is pushed to the right by the upper moving part 17u, and the right door 3 is pushed to the left by the lower moving part 17l. As a result, the left and right doors 3 close the entrance 2.

[0043] In this embodiment, the electric motor 18 that drives the drive pulley 19 and the door control unit 12 that controls the door drive unit 11 are located above one of the fixed door sections 6 (the right-side fixed door section 6). The aforementioned door drive unit 11 and door control unit 12 are located inside a case 13 that is elongated in the door opening and closing direction. In this embodiment, the electric motor 18 and the door control unit 12 are positioned above one of the fixed door sections 6, but the electric motor 18 and the door control unit 12 do not necessarily have to be positioned above the fixed door section 6. For example, the electric motor 18 and the door control unit 12 may be positioned above the door 3 that opens and closes.

[0044] As shown in Figure 2, Case 13 is formed in a roughly rectangular shape with a horizontally elongated cross-section perpendicular to the door opening and closing direction. Case 13 has an equipment housing section 21 on the exterior side that houses the door drive unit 11 and the door control unit 12, and a working space section 22 on the interior side that communicates with the equipment housing section 21. The main part of Case 13 is positioned above the ceiling panel 23 of the building. The equipment housing section 21 houses the door drive unit 11 and the door control unit 12 at a position above the ceiling panel 23 of the building. The working space section 22 communicates with the equipment housing section 21 at a position above the ceiling panel 23 of the building.

[0045] The case 13 comprises a case body 30 that forms an equipment housing section 21, and an extension case 31 that is detachably connected to the interior side of the case body 30 and forms a workspace section 22. In this embodiment, both the case body 30 and the extension case 31 are made of aluminum alloy.

[0046] The case body 30 has a vertical wall 30a connected to the back surface of the upper frame 4, an upper wall 30b extending substantially horizontally inward from the upper end of the vertical wall 30a, and a connecting wall 30c extending downward in a curved manner from the indoor-side extension end of the upper wall 30b. The equipment housing section 21, where equipment such as the rail 14, door hanger 16, electric motor 18, and door control unit 12 are arranged, is located below the upper wall 30b. A bracket fixing section 30d supporting a bolt 26 for fixing a bracket is provided on a part of the lower surface of the upper wall 30b closer to the indoor side. A fixing bracket 28 for fixing the inspection hatch cover 27, which will be described later, in a closed state is connected to the bracket fixing section 30d. The upper end of the fixing bracket 28 is fixed to the bracket fixing section 30d by a bolt 26 and a nut 29 screwed onto the shaft of the bolt 26. A cover fixing wall 28a, which is curved substantially horizontally inward, extends from the lower end of the fixing bracket 28. The upper surface of the inspection hatch cover 27 abuts against the lower surface of the cover fixing wall 28a. The inspection hatch cover 27 is detachably fixed to the cover fixing wall 28a by bolts 32.

[0047] The rail 14 is integrally formed with the vertical wall 30a of the case body 30. The electric motor 18 and the door control unit 12 are fixed to the upper wall 30b of the case body 30. However, the fixing points of the electric motor 18 and the door control unit 12 are not limited to the upper wall 30b. The electric motor 18 and the door control unit 12 may be fixed, for example, to a side wall (not shown) of the case body 30.

[0048] Furthermore, the connecting wall 30c is provided with an expansion case fixing section 34 that supports bolts 33 for fixing the expansion case. The expansion case 31 is detachably connected to the expansion case fixing section 34. The expansion case 31 is detachably fixed to the expansion case fixing section 34 by bolts 33 and nuts 35 that are screwed onto the shafts of the bolts 33.

[0049] The extension case 31 has an upper wall 31b that extends horizontally toward the interior from a position adjacent to the upper wall 30b of the case body 30, a vertical wall 31a that bends downward from the interior end of the upper wall 31b, and a connecting wall 31c that is connected to the exterior end of the upper wall 31b. The connecting wall 31c of the extension case 31 abuts against the extension case fixing part 34 of the case body 30, and in that state is detachably connected to the extension case fixing part 34 by bolts 33 and nuts 35. In addition, a locking fitting 36 with a substantially U-shaped cross section that fits onto the edge of the ceiling panel 23 is attached to the lower end of the vertical wall 31a of the extension case 31.

[0050] The workspace 22 is located below the upper wall 31b of the expansion case 31. In Figure 2, the equipment housing 21 and the workspace 22 are depicted as being separated by a fixing bracket 28, but the fixing bracket 28 is only positioned in a portion of the door opening direction, and the equipment housing 21 and the workspace 22 are in communication.

[0051] Furthermore, the expansion case 31 is provided with an inspection opening 40 below the work space 22. The inspection opening 40 spans a wide area in the door opening direction of the expansion case 31. The inspection opening 40 is an opening for an operator to insert their hand from the lower side of the case 13 when performing maintenance work inside the equipment housing 21 through the work space 22.

[0052] Furthermore, an inspection hatch cover 27 is rotatably attached to the lower end of the vertical wall 31a of the expansion case 31 (the edge of the inspection hatch 40) via a hinge member 41 such as a flat hinge. The inspection hatch cover 27 rotates on the edge of the inspection hatch 40 via the hinge member 41, allowing the inspection hatch 40 to be opened as needed. The hinge members 41 are attached to multiple locations on the lower end of the vertical wall 31a, spaced apart in the door opening and closing direction.

[0053] The inspection hatch cover 27 is formed from a nearly flat aluminum alloy plate. However, an upright wall 42 is attached to the interior-facing end of the inspection hatch cover 27, which bulges upward (upward in the state shown in Figure 2). A hinge member 41 is connected to this upright wall 42. When the inspection hatch cover 27 is rotated downward by more than 90° around the hinge member 41 (see Figure 3), the bulging end of the upright wall 42 points downward.

[0054] A bracket fixing portion 31d is provided on the lower surface of the upper wall 31b of the expansion case 31. A support bracket 44 that supports the stopper plate 43 is attached to the bracket fixing portion 31d. The support bracket 44 is fixed to the bracket fixing portion 31d, for example, by tightening a bolt 45 and a nut 46. The lower end of the stopper plate 43 is fastened and fixed to the lower end of the support bracket 44 by a bolt 50 and a nut 51. The stopper plate 43 is a long, plate-shaped member that is elongated in the vertical direction. The stopper plate 43 is allowed to rotate around the shaft of the bolt 50 by loosening the tightening of the bolt 50 and nut 51. The rotational position of the stopper plate 43 is fixed by tightening the bolt 50 and nut 51. When the inspection cover 27 is closed, the stopper plate 43 is fixed to the support bracket 44 with its extension end facing upward, as shown in Figure 2.

[0055] The support position of the stopper plate 43 by the support bracket 44 is set to be close to the vertical wall 31a of the expansion case 31. Furthermore, the support bracket 44 and the stopper plate 43 are positioned inside the expansion case 31 so that their lower ends do not protrude below the inspection opening 40 when the inspection opening cover 27 is closed.

[0056] Figure 3 is a cross-sectional view similar to Figure 2, showing the inspection hatch cover 27 of the door opening / closing device 10 in the open position. As shown in Figure 3, when the bolts 32 that secure the inspection hatch cover 27 are removed, the inspection hatch cover 27 can be rotated downward around the pivot axis of the hinge member 41. This opens the inspection hatch 40 at the bottom of the expansion case 31. At this time, when the bolts 50 connecting the support bracket 44 and the stopper plate 43 are loosened, the extended end of the stopper plate 43 can be displaced downward around the shaft of the bolts 50. At this point, the stopper plate 43 protrudes below the inspection hatch 40. In this state, the bolts 50 can be tightened to maintain the extended end of the stopper plate 43 protruding below the inspection hatch 40.

[0057] As shown in Figure 3, with the extended end of the stopper plate 43 protruding below the inspection opening 40, the upright wall 42 of the inspection opening cover 27, which opens widely downwards, abuts against it from the indoor side. At this time, the inspection opening cover 27 attempts to rotate around the axis of the hinge member 41 due to gravity, but the upright wall 42 abuts against the stopper plate 43 from the indoor side, restricting further rotation of the inspection opening cover 27. In this embodiment, the stopper plate 43 constitutes a restricting piece that can protrude below the ceiling panel 23. The stopper plate 43, which is a restricting piece, also constitutes an open fixing part that holds the inspection hatch cover 27 in an open state. The open state means that when the inspection hatch 40 is viewed from directly below, there is no part of the inspection hatch 40 that is covered by the inspection hatch cover 27, and the inspection hatch cover 27 is completely open.

[0058] Furthermore, in this embodiment, an example is described in which the inspection hatch 40 is opened and closed by rotating the inspection hatch cover 27 up and down about the pivot axis of the hinge member 41, but the embodiment is not limited to this. As another example, the inspection hatch 40 may be opened and closed by sliding the inspection hatch cover 27 along the lower surface of the ceiling panel 23.

[0059] When performing maintenance on the door drive unit 11 and door control unit 12 inside the case 13 (case body 30), the inspection hatch cover 27 is opened as described above, and the inspection hatch cover 27 is kept open by the stopper plate 43. When the inspection hatch 40 is opened downward in this way, maintenance work on the door drive unit 11 and door control unit 12 can be easily performed from the inspection hatch 40 through the work space 22 of the expansion case 31.

[0060] Furthermore, after opening the inspection hatch cover 27 as described above and performing maintenance work on the door drive unit 11 and door control unit 12, the bolts 50 are loosened to return the stopper plate 43 to its initial rotational position, and then the bolts 50 are tightened again to store the stopper plate 43 inside the expansion case 31. After this, the inspection hatch cover 27 is rotated around the axis of the hinge member 41 to return to the closed position, and in that state, the inspection hatch cover 27 is fixed to the fixing bracket 28 with bolts 32.

[0061] In this embodiment, the case body 30 can be used as a standalone unit without connecting the extension case 31 if the door opening / closing device is installed below the ceiling panel 23. However, in this case, a cover member (not shown) is attached to the interior side of the case body 30. Therefore, the same case body 30 can be used for both door opening / closing devices 10 that require the extension case 31 and those that do not. In this case, the expansion case 31 having a workspace section 22 and an inspection opening 40 can be treated as a workspace expansion unit by attaching an inspection opening cover 27 to its lower end in an openable and closable manner.

[0062] As described above, in this embodiment, the door opening and closing device 10 has an equipment housing section 21 and a work space section 22 provided in the case 13, and an inspection opening 40 located below the work space section 22 is openable and closable by an inspection opening cover 27. Therefore, in this embodiment, by opening the inspection opening cover 27 at the bottom of the case 13, the equipment inside the equipment housing section 21 can be easily inspected through the work space section 22 inside the case 13. Furthermore, in the door opening and closing device 10 of this embodiment, the inspection hatch cover 27 is connected to the lower end of the case 13 so that the inspection hatch cover 27 can be opened and closed without being affected by the ceiling of the building. Specifically, the inspection hatch cover 27 can be opened and closed reliably below the ceiling panel 23, regardless of the size of the installation opening formed in the ceiling panel 23 of the building or the condition of the space above the ceiling panel 23. Therefore, when the door opening and closing device 10 of this embodiment is adopted, a stable workspace for maintenance can be secured regardless of the condition of the installation site on the building side.

[0063] Furthermore, the door opening and closing device 10 of this embodiment is further equipped with a stopper plate 43 (opening fixing part) that holds the inspection hatch cover 27 in an open state. As a result, the inspection hatch cover 27 can be held in an open state by the stopper plate 43, which is the opening fixing part, so that the inspection hatch 40 can be reliably opened and maintenance work on the equipment inside the case 13 can be performed.

[0064] In particular, in the door opening and closing device 10 of this embodiment, the inspection hatch cover 27 is rotatably supported on the edge of the inspection hatch 40, and the opening fixing part is composed of a stopper plate 43 which is a restricting piece. The stopper plate 43 is positioned inside the case 13 and, when the inspection hatch cover 27 is open, at least a portion of it protrudes below the ceiling plate 23, restricting the rotation of the inspection hatch cover 27 in the closing direction. With this configuration, the inspection hatch cover 27 can be reliably kept in the open state despite its simple structure. In addition, when the inspection hatch cover 27 is not opened, the stopper plate 43 can be stored inside the case 13, thus improving the appearance quality when the inspection hatch cover 27 is closed.

[0065] The door opening and closing device 10 of this embodiment has a case 13 that comprises a case body 30 forming an equipment housing section 21 and an extension case 31 that forms a working space section 22 and to which an inspection hatch cover 27 is connected at the lower end. The extension case 31 is detachably attached to the case body 30.

[0066] Figure 4 is a cross-sectional view similar to Figure 4 of another embodiment of the door opening and closing device 110, which uses an extension case 131 that is longer in the depth direction than the extension case 31 shown in Figure 2. In this embodiment, the length of the upper wall 131b in the depth direction is longer than that of the embodiment shown in Figure 2. In this embodiment, since the length of the expansion case 131 in the depth direction is longer, the inspection hatch cover 127 is also set to have a longer length in the depth direction, similar to the expansion case 131. In this way, by having expansion cases 31 and 131 of different sizes available, the optimal expansion case 31 can be attached to the case body 30 and used according to the depth of the electric motor 18 and door control unit 12, and the environment of the building in which it will be installed. In the embodiment shown in Figure 4, the electric motor 18 and door control unit 12 are longer in the depth direction compared to the embodiment shown in Figure 2.

[0067] Furthermore, these embodiments utilize a case body 30 with the same specifications as existing door opening and closing devices that do not include expansion cases 31 and 131, and the door opening and closing device can be manufactured by attaching the expansion cases 31 and 131 to the case body 30 of the same specifications. Therefore, production efficiency can be increased by adopting the configuration of these embodiments.

[0068] Furthermore, as described above, the expansion case 31 having a workspace section 22 and an inspection opening 40 can be treated as a workspace expansion unit by attaching an inspection opening cover 27 to its lower end in an openable and closable manner. This workspace expansion unit can be attached to an existing case body 30 to easily manufacture a door opening and closing device 10 equipped with a workspace section 22, an inspection opening 40, and an inspection opening cover 27.

[0069] Furthermore, while the dimensions (length in the depth direction) of the door drive unit 11 and the door control unit 12 are not particularly limited, it is desirable that they fit within the depth direction of the case body 30, as shown in the embodiment in Figure 2. In this case, the case body 30, which has the same specifications as existing door devices that do not have expansion cases 31 and 131, can be used as is, together with the door drive unit 11 and the door control unit 12.

[0070] Next, as other embodiments, the door opening and closing devices of the second to ninth embodiments will be described with reference to Figures 6 to 37. In the second to ninth embodiments, the same reference numerals are used for parts that are identical or similar to the door opening and closing device 10 of the first embodiment, and detailed explanations are omitted.

[0071] <Door opening and closing device of the second embodiment> Figure 6 is a cross-sectional view of the door opening / closing device 310 in the second embodiment. Figure 7 is an enlarged cross-sectional view of part VII of the door opening / closing device 310 in Figure 6. As shown in Figures 6 and 7, the main difference between the second embodiment and the first embodiment is that the configuration of the inspection cover 312 of the door opening / closing device 310 in the second embodiment is different from the configuration of the inspection cover 27 of the door opening / closing device 10 in the first embodiment.

[0072] The inspection hatch cover 312 is made of, for example, an aluminum alloy. The inspection hatch cover 312 is rotatably mounted via a hinge member (connecting member) 314 such as a flat hinge. In the door opening and closing device 310 of the second embodiment, a hinge member 314 such as a flat hinge is used as an example of a connecting member, but the connecting member is not limited to a hinge member such as a flat hinge.

[0073] The inspection hatch cover 312 has a bulge 313 that extends integrally upward (i.e., toward the equipment housing 21) at the outdoor end 312a. Here, the equipment housing 21 is positioned to face the door 3 in the vertical direction. A hinge member 314 is connected to the bulge 313. The hinge member 314 is connected to the lower end 315a of the hinge bracket 315. The upper end 315b of the hinge bracket 315 is supported, for example, by a fixing bracket 28 and a bolt 26 to a bracket fixing portion 30d of the upper wall 30b. Thus, the hinge bracket 315 can be stably supported. In the second embodiment, an example is described in which the hinge bracket 315 is supported on the bracket fixing portion 30d of the upper wall 30b, but the hinge bracket 315 may be supported at any location.

[0074] The hinge bracket 315 is positioned to avoid the feed belt 17 (see Figure 2). The hinge bracket 315 and hinge member 314 are attached at multiple spaced locations along the extension of the rail 14. The hinge member 314 has a pivot shaft 314a. The pivot shaft 314a is located on the equipment housing 21 side of the inspection opening 40. The pivot shaft 314a is positioned horizontally, similar to the rail 14.

[0075] The outdoor end 312a of the inspection hatch cover 312 is connected to the case body 30 via a hinge member 314 and a hinge bracket 315. In other words, the inspection hatch cover 312 is rotatably mounted at the lower end 315a of the hinge bracket 315, around the pivot axis 314a of the hinge member 314. Furthermore, the approximate central portion 312b of the inspection hatch cover 312 is detachably fixed to the cover fixing wall 28a by bolts 32. That is, the inspection hatch cover 312 is fixed to the case body 30 by the hinge member 314 and bolts 32. The approximate central portion 312b of the inspection hatch cover 312 is located approximately midway between the outdoor end 312a and the indoor end 312c.

[0076] In the second embodiment, an example is described in which the approximately central portion 312b of the inspection hatch cover 312 is detachably fixed to the cover fixing wall 28a with bolts 32, but the embodiment is not limited to this. As another example, instead of the approximately central portion 312b of the inspection hatch cover 312, the indoor-side end 312c of the inspection hatch cover 312 may be detachably fixed with bolts.

[0077] The inspection hatch cover 312 can close the inspection hatch 40 when it is fixed to the case body 30 by the hinge member 314 and bolts 32. Here, the hinge member 314 is provided above the inspection hatch cover 312 in the vertical direction (i.e., on the equipment housing section 21 side) when the inspection hatch cover 312 is closing the inspection hatch 40.

[0078] Furthermore, the inspection hatch cover 312 can be rotated 90° downward toward the equipment housing 21 side by, for example, removing the bolt 32, so as to be in the open position, with the hinge member 314's rotation axis 314a as the pivot point. By positioning the inspection hatch cover 312 in the open position toward the equipment housing 21 side, the inspection hatch 40 can be opened. In this state, a workspace S can be secured below the inspection hatch cover 312.

[0079] In this way, the door opening and closing device 310 connects the exterior end 312a of the inspection hatch cover 312 to the hinge bracket 315 via a hinge member 314. Therefore, the door opening and closing device 310 can eliminate the need for the stopper plate 43, support bracket 44, and hinge member 41 (see Figure 2 for each) that are provided in the door opening and closing device 10 of the first embodiment.

[0080] As described above, the door opening and closing device 310 of the second embodiment opens the inspection hatch 40 by positioning the inspection hatch cover 312 in an open position facing the equipment housing section 21. Therefore, the inspection hatch cover 312 can be positioned on the opposite side of the worker from the work space S. This allows the worker to reach into the work space 22 from the side of the inspection hatch cover 312 that faces the work space 22 when the inspection hatch cover 312 is open. This prevents the inspection hatch cover 312 from getting in the way of the worker and improves the work efficiency of construction and maintenance.

[0081] Furthermore, in the second embodiment, the door opening and closing device 310 can improve aesthetics because, when the inspection hatch cover 312 is closed, the hinge member 314 is covered by the inspection hatch cover 312.

[0082] <Door opening and closing device of the third embodiment> Figure 8 is a cross-sectional view of the door opening and closing device 350 in the third embodiment. As shown in Figure 8, the main difference between the third embodiment and the second embodiment is that the configuration of the inspection cover 352 of the door opening / closing device 350 in the third embodiment is different from the configuration of the inspection cover 312 of the door opening / closing device 310 in the second embodiment. The inspection hatch cover 352 includes, for example, a cover body 353, a vertical wall 354 integrally provided with the cover body 353, and an upper wall 355 integrally provided with the vertical wall 354. The inspection hatch cover 352 is made of, for example, an aluminum alloy.

[0083] The cover body 353 is formed in the same manner as the inspection hatch cover 312 of the second embodiment. The vertical wall 354 rises upward from approximately the center of the cover body 353. The vertical wall 354 is provided with a projection 357 for holding wiring in place. The projection 357 protrudes toward the hinge member 314 from a position spaced upward from the lower end of the vertical wall 354. A wiring retainer 358 is detachably attached to the projection 357. The wiring retainer 358 is formed of, for example, resin.

[0084] The projection 357 and the wiring retainer 358 form a space for holding the wiring 359. The wiring 359 is used to connect the door drive unit 11, which drives the pair of doors 3 to open and close, and the door control unit 12, which controls the door drive unit 11 (see Figure 1 for both). The wiring 359 can be placed in the space when the wiring retainer 358 is detached from the projection 357. The wiring 359 placed in the space is held in the space by the wiring retainer 358 and projection 357 by attaching the wiring retainer 358 to the projection 357. The projection 357 and the wiring retainer 358 form a wiring holding portion 361. That is, the inspection hatch cover 352 is equipped with, for example, a wiring holding portion 361.

[0085] The upper wall 355 extends from the upper end of the vertical wall 354 toward the expansion case fixing portion 34 of the upper wall 30b (i.e., case 13). The expansion case fixing portion 34 has a first locking portion 34a that opens toward the upper wall 355. The upper wall 355 has a second locking portion 355a at its tip. The second locking portion 355a protrudes toward the first locking portion 34a so that it can be temporarily fixed toward the first locking portion 34a. The first locking portion 34a and the second locking portion 355a form a temporary fixing portion 362 that is detachably connected when the inspection opening 40 is closed by the cover body 353. That is, the inspection opening cover 352 and the case 13 are equipped with a temporary fixing portion 362. The temporary fixing portion 362 allows the second locking portion 355a to be fitted into the first locking portion 34a by, for example, elastically deforming the upper wall 355. Hereinafter, this type of fixing, which uses the elastic deformation of parts to fit parts together, will be referred to as snap-fit ​​fixing.

[0086] In the third embodiment, a snap-fit ​​fastening is described as an example of the temporary fixing part 362, but the temporary fixing part 362 is not limited to a snap-fit ​​fastening. Other examples include using magnets or plungers for the temporary fixing part 362. For example, by using magnets for the temporary fixing part 362, it is possible to fix it without elastic deformation like with a snap-fit ​​fastening. Therefore, deterioration of the material can be suppressed, and the durability of the temporary fixing part 362 can be improved. For example, by using plungers for the temporary fixing part 362, the temporary fixing position of the inspection hatch cover 352 can be maintained more firmly compared to a snap-fit ​​fastening. Furthermore, instead of snap-fit ​​fastening, the inspection hatch cover 352 may be temporarily secured with a latch, or the rotation angle of the inspection hatch cover 352 may be fixed with a torque hinge.

[0087] As described above, the door opening and closing device 350 of the third embodiment is equipped with an inspection hatch cover 352 and a temporary fixing part 362. Therefore, after temporarily closing the inspection hatch 40 with the inspection hatch cover 352 using the temporary fixing part 362, the inspection hatch cover 352 can be finally fixed to the case 13 using bolts (fixing devices) 32. As a result, when closing the inspection hatch cover 352, it is no longer necessary for the worker to hold the inspection hatch cover 352 with their hand while fixing it with the bolts 32. Thus, the closing work of the inspection hatch cover 352 can be made easier.

[0088] Furthermore, the door opening and closing device 350 of the third embodiment is equipped with a wiring retaining section 361 on the inspection hatch cover 352. Therefore, it is no longer necessary to directly fix the wiring 359 used to connect the door drive unit 11 and the door control unit 12 (both, see Figure 1) inside the case 13, for example. Also, since the wiring 359 can be fixed to the wiring retaining section 361 of the open inspection hatch cover 352, the wiring fixing work can be performed in front of the worker. This improves the ease of assembly of the door opening and closing device 350.

[0089] <Door opening and closing device of the fourth embodiment> Figure 9 is a cross-sectional view of the door opening and closing device 410 in the fourth embodiment. As shown in Figure 9, the main difference between the fourth embodiment and the first embodiment is that the door opening / closing device 410 of the fourth embodiment is provided with a support bracket (support part) 412 and a fixing bracket 414 in addition to the door opening / closing device 10 of the first embodiment.

[0090] Similar to the door opening and closing device 10 of the first embodiment, the door opening and closing device 410 has the equipment housing section 21 and the work space section 22 arranged side by side along the horizontal direction, with the equipment housing section 21 positioned on the exterior side of the work space section 22. Also, similar to the door opening and closing device 10 of the first embodiment, the door opening and closing device 410 includes a door drive unit 11 (see Figure 1). The door drive unit 11 includes a rail 14 arranged along the opening and closing direction of the door 3, and a door hanger 16 (see Figure 2) that suspends and supports the door 3 on the rail 14. The door hanger 16 has rollers 15 (see Figures 1 and 2) that roll on the rail 14.

[0091] The support bracket 412 is fixed to the fixing bracket 414 via bolts 415 with its outdoor end 412a positioned on the lower surface of the rail 14. The support bracket 412 is formed of, for example, sheet metal. The fixing bracket 414 is positioned on the upper surface of the rail 14. The fixing bracket 414 is formed in a block shape by, for example, extrusion molding of an aluminum alloy.

[0092] Specifically, the fixing bracket 414 has its outdoor end 414a positioned on the upper surface of the rail 14, and its indoor end 414b positioned on the upper surface of the support bracket 412. Therefore, the outdoor end 414a of the fixing bracket 414 and the outdoor end 412a of the support bracket 412 are positioned above and below the rail 14. In this state, the fixing bracket 414 and the support bracket 412 are tightened from above and below by bolts 415 so as to sandwich the rail 14. As a result, the outdoor end 412a of the support bracket 412 is fixed to the lower surface of the rail 14 by the fixing bracket 414 and bolts 415.

[0093] The rail 14 is provided on the vertical wall (side) 30a of the case 13. The vertical wall 30a forms the side of the case 13 opposite to the working space 22 in the equipment housing section 21. Therefore, the support bracket 412 is provided on the vertical wall 30a of the case 13 and below the rail 14. In the fourth embodiment, an example is described in which the outdoor end 412a of the support bracket 412 is fixed to the lower surface of the rail 14, but the embodiment is not limited to this. As another example, for instance, the vertical wall 30a of the case 13 may be extended downwards from the rail 14, and the outdoor end 412a of the support bracket 412 may be fixed to the portion that extends downwards.

[0094] Furthermore, the indoor end portion 412b of the support bracket 412 can be detachably fixed to the center 27a of the inspection hatch cover 27 by a bolt 32 when the inspection hatch cover 27 is closing the inspection hatch 40. The center 27a of the inspection hatch cover 27 is the central position of the inspection hatch cover 27 in the first direction A, or near that central position, when the inspection hatch cover 27 is closing the inspection hatch 40, and the direction in which the equipment housing portion 21 and the work space portion 22 are aligned is defined as the first direction A. In other words, the support bracket 412 supports the equipment housing section 21 side from the center 27a of the inspection port cover 27 when the inspection port cover 27 is closed over the inspection port 40. Thus, the case 13, the support bracket 412, and the inspection port cover 27 with the inspection port 40 closed can form a closed cross-sectional structure (a structure with a frame-shaped cross-section).

[0095] As described above, the door opening and closing device 410 of the fourth embodiment has a closed cross-sectional structure formed by the case 13, the support bracket 412, and the inspection opening cover 27 that closes the inspection opening 40. Therefore, the load (self-weight) of the door opening and closing device 410 can be distributed to the upper and lower ends of the vertical wall 30a of the case 13. As a result, the rigidity of the case 13 can be increased, and deformation that would cause the working space 22 side of the case 13 to tilt downward can be suppressed.

[0096] Furthermore, in the fourth embodiment of the door opening and closing device 410, the outdoor end 412a of the support bracket 412 is fixed to the lower surface of the rail 14 by a fixing bracket 414 and a bolt 415. Therefore, the outdoor end 412a can be fixed using the rail 14. As a result, there is no need to prepare a separate part for fixing the support bracket 412. Therefore, the door opening and closing device 410 can have a simple structure.

[0097] <Modified form of the fourth embodiment> Figure 10 is a cross-sectional view of the door opening and closing device 430 in a modified example of the fourth embodiment. As shown in Figure 10, the main difference between the modified version of the fourth embodiment and the fourth embodiment is that the configuration of the fixing bracket 432 of the door opening / closing device 430 in the modified version of the fourth embodiment is different from the configuration of the fixing bracket 414 in the fourth embodiment.

[0098] The fixing bracket 432 has its outdoor end 432a positioned on the upper surface of the rail 14 and its indoor end 432b positioned on the upper surface of the support bracket 412. Therefore, the outdoor end 432a of the fixing bracket 432 and the outdoor end 412a of the support bracket 412 are positioned above and below the rail 14. In this state, the fixing bracket 432 and the support bracket 412 are tightened from above and below by bolts 415 so as to sandwich the rail 14. As a result, the outdoor end 412a of the support bracket 412 is fixed to the lower surface of the rail 14 by the fixing bracket 432 and bolts 415.

[0099] As described above, the modified door opening / closing device 430 in the fourth embodiment can obtain the same effects and advantages as the door opening / closing device 410 in the fourth embodiment.

[0100] <Door opening and closing device of the fifth embodiment> Figure 11 is a cross-sectional view of the door opening / closing device 450 in the fifth embodiment. Figure 12 is a cross-sectional view of the door opening / closing device 450 in Figure 11 along the line XII-XII, showing only the groove 452 and the slide bolt 454. As shown in Figures 11 and 12, the main difference between the fifth embodiment and the first embodiment is that the door opening / closing device 450 of the fifth embodiment is provided with a groove 452 and a slide bolt 454 in addition to the door opening / closing device 10 of the first embodiment.

[0101] The groove 452 is provided in the vertical wall 31e. The vertical wall 31e is provided with a gap between it and the vertical wall 31a on the working space 22 side. The gap is formed to accommodate the head 454a of the slide bolt 454.

[0102] The groove 452 has a first groove 461, a second groove 462, and a third groove 463. The first groove 461 has a main portion that extends in the vertical direction. The first groove 461 is formed to allow the threaded portion 454b of the slide bolt 454 to move freely. The first groove 461 extends laterally (horizontally) from the lower end of the main portion and communicates with the second groove 462. The second groove 462 is formed to accommodate the head 454a of the slide bolt 454.

[0103] Furthermore, the first groove 461 extends laterally (horizontally) from the upper end of the main part and communicates with the third groove 463. The third groove 463 extends downward from the tip of the laterally extending first groove 461. The third groove 463 is capable of accommodating the threaded portion 454b of the slide bolt 454.

[0104] The slide bolt 454 is attached together with a nut 458 to a projection 456 that protrudes upward from the hinge member 41. For example, with the nut 458 loosened, the head 454a of the slide bolt 454 is fitted into the second groove 462, and the threaded portion 454b is fitted from the second groove 462 into the first groove 461. The slide bolt 454 moves vertically along the main part of the first groove 461. By moving the slide bolt 454 vertically along the main part of the first groove 461, the hinge member 41 can move vertically together with the slide bolt 454. Furthermore, the slide bolt 454 is fixed to the third groove 463 by tightening the nut 458 when it is in the position where it has moved to the third groove 463.

[0105] According to the fifth embodiment of the door opening and closing device 450, for example, when inspecting the door opening and closing device 450, the bolt 32 is removed and the inspection hatch cover 27 is opened and lowered vertically. By raising the inspection hatch cover 27 after it has been lowered, the slide bolt 454 rises along the first groove 461. The upper half of the raised inspection hatch cover 27 is stored in the work space 22 from the inspection hatch 40.

[0106] By moving the raised inspection hatch cover 27 laterally (horizontally), the slide bolt 454 moves laterally from the upper end of the main part in the first groove 461 and is positioned in the third groove 463. In this state, the inspection hatch cover 27 can be fixed to the vertical wall 31a during inspection by tightening the nut 458.

[0107] As described above, in the fifth embodiment of the door opening and closing device 450, the upper half of the inspection hatch cover 27 can be stored in the work space 22 from the inspection hatch 40. This allows the inspection hatch cover 27 to be kept out of the way of inspection work without having to remove it when inspecting the door opening and closing device 450. Furthermore, there is no need to attach or detach the inspection hatch cover 27 to the vertical wall 31a, allowing the work to be done by a small number of people. In addition, the vertical wall 31a can prevent the inspection hatch cover 27 from moving in the forward direction, thus preventing the inspection hatch cover 27 from being moved by contact with a worker. This improves the workability when inspecting the door opening and closing device 450, for example.

[0108] <Door opening and closing device of the 6th embodiment> Figure 13 is a cross-sectional view of the door opening / closing device 510 in the sixth embodiment. Figure 14 is a cross-sectional view of the door opening / closing device 510 in Figure 13 along the line XIV-XIV, showing only the groove 512 and the slide bolt 454. As shown in Figures 13 and 14, the main difference between the sixth embodiment and the fifth embodiment is that the configuration of the groove 512 and inspection cover 514 of the door opening / closing device 510 in the sixth embodiment is different from the configuration of the groove 452 and inspection cover 27 of the door opening / closing device 450 in the fifth embodiment.

[0109] The groove 512 has a first groove 521 and a second groove 522. The first groove 521 has a main portion that extends in the vertical direction. The first groove 521 is formed so that the threaded portion 454b of the slide bolt 454 can move freely. The first groove 521 extends laterally (horizontally) from the lower end of the main portion and communicates with the second groove 522. The second groove 522 is a groove capable of accommodating the head 454a of the slide bolt 454.

[0110] The inspection hatch cover 514 has an interior end portion 514a that extends from the hinge member 41 toward the interior. The other shape of the inspection hatch cover 514 is the same as that of the inspection hatch cover 27 in the fifth embodiment. By extending the interior end portion 514a of the inspection hatch cover 514 toward the interior, the hinge member 41 and the head 454a of the slide bolt 454 can be covered from below when the inspection hatch cover 514 is closed.

[0111] According to the door opening and closing device 510 of the sixth embodiment, for example, when inspecting the door opening and closing device 510, the bolt 32 is removed and the inspection cover 514 is moved downward along the main part of the groove 512 as indicated by the arrow. The slide bolt 454 moves downward together with the inspection cover 514 as indicated by the arrow. With the inspection cover 514 positioned downward, the inspection cover 514 is opened and hangs down. In this way, by moving the inspection hatch cover 514 downward before opening it, space can be secured for the inspection hatch cover 514 to rotate in the opening direction around the hinge member 41. This allows the inspection hatch cover 514 to be opened without the indoor end 514a of the inspection hatch cover 514 interfering with the lower end of the vertical wall 31a or the like.

[0112] As described above, the door opening and closing device 510 of the sixth embodiment can cover the hinge member 41, slide bolt 454, etc. from below when the inspection hatch cover 514 is closed. Furthermore, the door opening and closing device 510 of the sixth embodiment can open the inspection hatch cover 514 by moving the inspection hatch cover 514 downward, without interfering the interior end 514a of the inspection hatch cover 514 with the lower end of the vertical wall 31a, etc.

[0113] <Door opening and closing device of the 7th embodiment> Figure 15 is a cross-sectional view of the door opening / closing device 550 in the seventh embodiment. Figure 16 is a cross-sectional view of the door opening / closing device 550 in Figure 15 along the line XVI-XVI, showing the state with the inspection hatch cover 556 omitted. As shown in Figures 15 and 16, the main difference between the seventh embodiment and the first embodiment is that the door opening / closing device 550 of the seventh embodiment is provided with a rail base 552 and a pair of angle members 554 in addition to the door opening / closing device 10 of the first embodiment. Also, the configuration of the inspection hatch cover 27 of the door opening / closing device 10 in the first embodiment is different from the configuration of the inspection hatch cover 556 of the door opening / closing device 550 in the seventh embodiment.

[0114] The inspection hatch cover 556 is attached to the interior end by changing the orientation of the hinge member 41. The other components of the inspection hatch cover 556 are the same as those of the inspection hatch cover 27.

[0115] The rail base 552 is integrally formed along the lower end of the vertical wall 31a at a point near the lower end. The rail base 552 protrudes from the point near the lower end of the vertical wall 31a toward the working space 22. Hinge members 41 are attached to both ends 552a and the central part 552b of the rail base 552 in the longitudinal direction. The longitudinal direction of the rail base 552 is perpendicular to the plane of the paper. The interior end 556a of the inspection hatch cover 556 is attached to the hinge members 41 at both ends 552a and the central part 552b.

[0116] The pair of angle members 554 are formed in an L-shape. The vertical pieces 554a of the pair of angle members 554 are fixed to a pair of side walls 31f in the expansion case 31 by welding, for example. Note that the method of fixing the pair of angle members 554 to the pair of side walls 31f is not limited to welding. The horizontal pieces 554b of the pair of angle members 554 are attached to both ends 552a of the rail base 552 by a plurality of (two in the seventh embodiment) bolts 558. Both ends 552a of the rail base 552 are fixed by a plurality of bolts 558 while positioned on the horizontal pieces 554b of the pair of angle members 554.

[0117] This allows the ends 552a of the rail base 552 to be connected (fixed) to the pair of side walls 31f via angle members 554. In this state, the pair of angle members 554 are attached close to the hinge members 41 of both ends 552a in the longitudinal direction of the rail base 552. In the seventh embodiment, two bolts 558 are used as an example to describe the plurality of bolts 558, but the number of bolts 558 can be arbitrarily selected.

[0118] As described above, in the seventh embodiment, the door opening and closing device 550 connects both ends 552a of the rail base 552 to a pair of side walls 31f via angle members 554. Therefore, the majority of the load due to the weight of the inspection hatch cover 514 and hinge member 41 can be supported by the pair of side walls 31f. This reduces the load on the vertical wall 31a and prevents deformation that would cause the expansion case 31 side (i.e., the work space 22 side) to tilt downward.

[0119] <First modified example of the seventh embodiment> Figure 17 is a cross-sectional view of the door opening and closing device 610 in a first modified example of the seventh embodiment. As shown in Figure 17, the main difference between the first modified example of the seventh embodiment and the seventh embodiment is that the door opening and closing device 610 in the first modified example of the seventh embodiment is equipped with a U-shaped bracket 612 in addition to the pair of angle members 554 provided in the door opening and closing device 550 of the seventh embodiment.

[0120] The lower end portion 612a of the bracket 612 is attached to the longitudinal central portion 552b of the rail base 552 via a bolt 614. The upper end portion 612b of the bracket 612 is attached by bolt 615 to the central part of the interior end portion 31g of the upper wall 31b. The central part of the interior end portion 31g of the upper wall 31b is located above the central portion 552b of the rail base 552. In other words, the central portion 552b of the rail base 552 is supported by the upper wall 31b via the bracket 612.

[0121] As described above, in the seventh embodiment, the door opening and closing device 610 of the first modified example supports the central part 552b of the rail base 552 on the upper wall 31b via a bracket 612. Therefore, the load on both ends 552a of the rail base 552 is supported by the pair of side walls 31f, and the load on the central part 552b of the rail base 552 is supported by the upper wall 31b. This makes it possible to keep the load on the vertical wall 31a small and suppress deformation that would cause the expansion case 31 side (i.e., the working space 22 side) to tilt downward.

[0122] <Second modified example of the seventh embodiment> Figure 18 is a cross-sectional view of the door opening and closing device 650 in a second modified example of the seventh embodiment. As shown in Figure 18, the main difference between the second modified example of the seventh embodiment and the first embodiment is that the door opening / closing device 650 in the first modified example of the seventh embodiment is provided with a pair of angle members 652 in addition to the door opening / closing device 10 of the first embodiment. The pair of angle members 652 are formed in an L-shape. The pair of angle members 652 are connected (fixed) at both ends to the pair of side walls 31f (see also Figure 16) at the upper end 31h of the vertical wall 31a. The ends at the upper end 31h of the vertical wall 31a are in close proximity to the pair of side walls 31f.

[0123] As described above, in the second modified example of the seventh embodiment, the door opening and closing device 650 has both ends of the upper end 31h of the vertical wall 31a connected to a pair of side walls 31f with angle members 652. Therefore, the load on the vertical wall 31a can be supported by the upper wall 31b. This makes it possible to keep the load on the vertical wall 31a small and suppress deformation that would cause the expansion case 31 side (i.e., the work space 22 side) to tilt downward.

[0124] <Door opening and closing device of the 8th embodiment> Figure 19 is a cross-sectional view of the door opening and closing device 710 in the eighth embodiment. As shown in Figure 19, the main difference between the eighth embodiment and the first embodiment is that the configuration of the case body 712 of the door opening / closing device 710 in the eighth embodiment is different from the configuration of the case body 30 of the door opening / closing device 10 in the first embodiment. In addition, the door opening / closing device 710 of the eighth embodiment is provided with a fastening member 713 on the case body 30 of the first embodiment.

[0125] The case body 712 has a wiring support portion 714 with an L-shaped cross-section. The wiring support portion 714 is integrally formed with the interior end of the upper wall 30b. The wiring support portion 714 has a first wiring support portion 714a that extends horizontally from the upper wall 30b to the interior end, and a second wiring support portion 714b that extends downward from the first wiring support portion 714a. The first wiring support portion 714a is equipped with a first magnet plate 715 on its inner surface. The first magnet plate 715 is fixed to the inner surface of the first wiring support portion 714a, for example, with double-sided tape 716. Alternatively, the first magnet plate 715 may be attached to the inner surface of the first wiring support portion 714a with an adhesive or the like. The second wiring support section 714b is equipped with a second magnet plate 718 on its inner surface. The second magnet plate 718 is fixed to the inner surface of the second wiring support section 714b, for example, with double-sided tape 719. Alternatively, the second magnet plate 718 may be attached to the inner surface of the second wiring support section 714b with an adhesive or the like.

[0126] Figure 20 is a front view of the fastening member 713 in the eighth embodiment. Figure 21 is a cross-sectional view showing the fastening member 713 in the eighth embodiment in an open state. As shown in Figures 19 to 21, the binding member 713 is made of metal (magnetic material). The binding member 713 has, for example, a binding portion 721 that accommodates a plurality of wires 720, a lid portion 722 that opens and closes the binding portion 721, and a shaft portion 723 that biases the lid portion 722 to a closed state. The binding member 713 is formed in a rectangular cross-section when the lid portion 722 is closed.

[0127] The binding member 713 is formed in a U-shape in cross-section. The lid portion 722 is formed in an L-shape in cross-section. The shaft portion 723 biases the lid portion 722 to a closed position. The lid portion 722 can be opened from the closed position against the negative force of the shaft portion 723. The binding member 713 is magnetically and detachably fixed to the first magnet plate 715 and the second magnet plate 718 when multiple wires 720 are bundled together. That is, the binding member 713 is detachably fixed to the wiring support portion 714. The binding member 713 is attached, for example, to multiple locations at intervals along the longitudinal direction (direction perpendicular to the plane of the paper) of the wiring support portion 714.

[0128] Figure 22 is a cross-sectional view illustrating the operation of attaching the binding member 713 to the wiring support portion 714 in the eighth embodiment. As shown in Figure 22, with the lid 722 of the binding member 713 open, multiple wires 720 are placed together in the binding section 721. With the multiple wires 720 placed in the binding section 721, the lid 722 is closed with the shaft 723 using non-force. This allows the multiple wires 720 to be bundled together in the binding member 713. With the multiple wires 720 bundled together, the binding member 713 is attached to the first magnet plate 715 and the second magnet plate 718 so as to be detachable by magnetic force.

[0129] As described above, in the eighth embodiment, the door opening and closing device 710 allows the binding member 713 to be removed from the wiring support portion 714, and the wiring 720 to be bound to the binding member 713 at a position lower than the wiring support portion 714 of the case body 712. After the wiring 720 is bound to the binding member 713, the binding member 713 can be moved to the wiring support portion 714 and attached to the wiring support portion 714 magnetically and detachably. This makes it easy to bind the wiring 720 to the wiring support portion 714 of the door opening and closing device 710.

[0130] <First modified example of the eighth embodiment> Figure 23 is a cross-sectional view of the door opening and closing device 750 in the first modified example of the eighth embodiment. As shown in Figure 23, the difference between the first modified example of the eighth embodiment and the eighth embodiment lies in the fact that the configuration of the case body 752 of the door opening / closing device 750 in the first modified example of the eighth embodiment is different from the configuration of the case body 712 of the door opening / closing device 710 in the eighth embodiment. The case body 752 is a modified version of the case body 712 in the eighth embodiment, in which the wiring support portion 714 is replaced with the wiring support portion 754.

[0131] The wiring support section 754 includes a first wiring support section 754a that extends horizontally from the upper wall 30b to the interior end, and a second wiring support section 754b that extends downward from the first wiring support section 754a. The first wiring support portion 754a has a pair of protruding pieces 756. The first wiring support portion 754a can be attached by inserting the first magnet plate 715 between the inner surface of the first wiring support portion 754a and the pair of protruding pieces 756. The second wiring support portion 754b has a pair of protruding pieces 758. The second wiring support portion 754b can be attached by inserting the second magnet plate 718 between the inner surface of the second wiring support portion 754b and the pair of protruding pieces 758.

[0132] As described above, the door opening and closing device 750 in the first modified example of the eighth embodiment can obtain the same effects and advantages as the door opening and closing device 710 in the eighth embodiment.

[0133] <Second variation of the eighth embodiment> In the eighth embodiment and the first modification of the eighth embodiment, an example was described in which the binding member 713 has a rectangular cross-section, but the binding member may have other shapes such as a circular cross-section. Next, an example in which the binding member has a circular cross-section will be described in the second modification of the eighth embodiment. Figure 24 is a cross-sectional view of the fastening member 770 in a second modified example of the eighth embodiment. Figure 25 is a cross-sectional view showing the fastening member 770 in an open state in the second modified example of the eighth embodiment. As shown in Figures 24 and 25, the binding member 770 is made of metal (magnetic material). The binding member 770 has a binding portion 771 for housing the wiring, a lid portion 772 for opening and closing the binding portion 771, and a shaft portion 773 for biasing the lid portion 772 to a closed state. The binding member 770 is formed in a circular arc shape in cross-section when the lid portion 772 is closed.

[0134] The binding portion 771 is formed in a semi-circular cross-section. The lid portion 772 is formed in a semi-circular cross-section. The shaft portion 773 biases the lid portion 772 to a closed position. The lid portion 772 can be opened from the closed position against the non-force of the shaft portion 773. The binding member 770 can be attached to and detached by magnetic force from a wiring support portion of a case body (not shown) when multiple wires (not shown) are bundled together. This wiring support portion is equipped with a magnetic plate (not shown) to which the binding member 770, which has a circular cross-section, can be attached and detached.

[0135] <Door opening and closing device of the 9th embodiment> Figure 26 is a front view of the door opening / closing device 810 in the ninth embodiment, as seen from the interior side. As shown in Figure 26, the main difference between the ninth embodiment and the first embodiment is that the door opening and closing device 810 of the ninth embodiment includes a case body 812, a cover holding part 813, and a pair of inspection hatch covers 814, instead of the case body 30, inspection hatch cover 27, and hinge member 41 of the first embodiment. The pair of inspection hatch covers 814 are positioned to meet along the door 3 (see Figure 2).

[0136] The case body 812 has a groove 821 that extends horizontally along the door 3 (see Figure 2). The groove 821 is open toward the interior side. The cover retaining portion 813 comprises a pair of first brackets 823, a pair of second brackets 824, a pair of first hinge portions 825, and a pair of second hinge portions 826.

[0137] A pair of first brackets 823 are slidably supported along the door 3 (see Figure 2) via slide bolts 831 and slide plates 832 at both ends of the groove 821. The lower ends of the pair of first brackets 823 are connected to the outer ends of a pair of inspection hatch covers 814 via a pair of first hinges 825.

[0138] The pair of second brackets 824 are slidably supported along the door 3 (see Figure 2) via slide bolts 831 and slide plates 832 in the center of the groove 821. The lower ends of the pair of second brackets 824 are detachably fixed to the inner ends of the pair of inspection hatch covers 814 by a pair of bolts 827. The pair of inspection hatch covers 814 are connected at their opposing inner ends by a pair of second hinges 826. The pair of second hinges 826 are spaced apart in the direction in which the equipment housing section 21 and the work space section 22 are aligned (see also Figure 29). The pair of inspection hatch covers 814 can cover the work space section 22 from below.

[0139] Figure 27 is a cross-sectional view of the door opening / closing device 810 in Figure 26 along the line XXVII-XXVII. Figure 28 is a front view of the door opening / closing device 810 in Figure 27, as seen from the interior side. As shown in Figures 27 and 28, the first bracket 823 is formed in an L-shape. The upper end portion 823a of the first bracket 823 is slidably supported in the groove portion 821 by a slide bolt 831 and a slide plate 832. Specifically, the slide plate 832 is slidably positioned in the groove portion 821. The slide bolt 831, which passes through the upper end portion 823a of the first bracket 823, is screw-connected to the slide plate 832. The lower end portion 823b of the first bracket 823 is connected to the outer end portion of the inspection hatch cover 814 via the first hinge portion 825. The first hinge portion 825 supports the inspection hatch cover 814 so that it can be lowered as indicated by the arrow.

[0140] Figure 29 is a cross-sectional view of the door opening / closing device 810 in Figure 26 along the line XXIX-XXIX. Figure 30 is a front view of the door opening / closing device 810 in Figure 29, as seen from the interior side. As shown in Figures 29 and 30, the pair of second hinges 826 connect the inner ends of the pair of inspection hatch covers 814 so that they can be moved downward as indicated by the arrows.

[0141] Figure 31 is a cross-sectional view of the door opening / closing device 810 in Figure 26 along the line XXXI-XXXI. Figure 32 is a front view of the door opening / closing device 810 in Figure 31, as seen from the interior side. As shown in Figures 31 and 32, the second bracket 824 is formed in an L-shape. The upper end portion 824a of the second bracket 824 is slidably supported in the groove 821 by a slide bolt 831 and a slide plate 832. Specifically, the slide plate 832 is slidably positioned in the groove 821. The slide bolt 831, which passes through the upper end portion 824a of the second bracket 824, is screw-connected to the slide plate 832. The lower end portion 824b of the second bracket 824 is detachably fixed to the inner end portion of the inspection hatch cover 814 by a bolt 827.

[0142] Next, the operation of opening the pair of inspection hatch covers 814 will be explained based on Figures 33 to 36. Figure 33 is a front view illustrating an example of removing a pair of bolts 827 from the inspection hatch cover 814 in the ninth embodiment. As shown in Figures 26 and 33, remove the pair of bolts 827 from the inner ends of the pair of inspection hatch covers 814. By removing the pair of bolts 827 from the inner ends of the pair of inspection hatch covers 814, the inner ends of the pair of inspection hatch covers 814 will descend due to their own weight as indicated by the arrows.

[0143] Figure 34 is a front view illustrating an example of suppressing the descent of the inspection hatch cover 814 due to its own weight in the ninth embodiment. As shown in Figures 33 and 34, when the inner ends of the pair of inspection hatch covers 814 descend due to their own weight, the sliding plate 832 rotates within the groove 821 as indicated by the arrow. The rotation of the sliding plate 832 restricts its sliding movement within the groove 821. By restricting the movement of the sliding plate 832, the downward movement of the inner ends of the pair of inspection hatch covers 814 due to their own weight is suppressed.

[0144] Figure 35 is a front view illustrating an example in which the first bracket 823 moves along the groove 821 in the ninth embodiment. As shown in Figure 35, one of the first brackets 823 is moved by the worker's hand along the groove 821 in the direction of the arrow. By moving one of the first brackets 823 along the groove 821, the pair of inspection hatch covers 814 are folded.

[0145] Figure 36 is a front view illustrating the folded state of the pair of inspection hatch covers 814 in the ninth embodiment. As shown in Figure 36, one of the first brackets 823 is moved by the worker along the groove 821 to the end (i.e., to the other first bracket 823). Moving one of the first brackets 823 causes the pair of second brackets 824 to move together with the first bracket 823. Moving one of the first brackets 823 to the end folds the pair of inspection hatch covers 814. This keeps the pair of inspection hatch covers 814 in the open position. In this state, the inspection hatch 40 can be opened.

[0146] As described above, the door opening and closing device 810 in the ninth embodiment can enhance its aesthetic appeal by covering the inspection opening 40 of the work space 22 from below with a pair of inspection opening covers 814. Furthermore, the inspection hatch 40 in the work space 22 can be opened by folding the pair of inspection hatch covers 814. This allows the pair of inspection hatch covers 814 to be kept out of the way when inspecting the door opening and closing device 810 without having to remove them. Also, there is no need to attach or detach the pair of inspection hatch covers 814 to the vertical wall 31a (see Figure 2), allowing the work to be done by a small number of people. In addition, since the movement of the pair of inspection hatch covers 814 in the forward direction can be suppressed, it is possible to prevent the pair of inspection hatch covers 814 from being moved by contact with a worker. This improves the workability, for example, when inspecting the door opening and closing device 810.

[0147] In the ninth embodiment, an example is described in which the inner ends of a pair of inspection hatch covers 814 are lowered and folded into a V-shape, but the folding method of the inspection hatch cover is not limited to a V-shape. As another example, the inspection hatch cover may be configured to be folded in multiple places in a wave shape with a continuous W-shaped cross-section, like a curtain. Furthermore, for example, when the inspection hatch cover is folded in a wave shape in multiple places, the folded inspection hatch cover may be configured to slide along the groove 821 in a bundled state.

[0148] <Modified form of the 9th embodiment> In the ninth embodiment, an example was described in which the slide plate 832 is moved along the groove 821, but other members such as T-slot bolts may also be used. Next, an example of moving the T-slot bolt 850 along the groove 821 will be described as a modification of the ninth embodiment. Figure 37 is a cross-sectional view showing a modified example of the ninth embodiment in which the T-slot bolt 850 is supported in the groove 821. As shown in Figure 37, the T-slot bolt 850 has a head 850a and a threaded portion 850b. The head 850a is slidably positioned in the groove 821. The threaded portion 850b passes through the upper ends 823a of a pair of first brackets 823 and the upper ends 824a of a pair of second brackets 824. A nut 851 is screwed to the threaded portion 850b that protrudes from the upper ends 823a of the pair of first brackets 823 and the upper ends 824a of the pair of second brackets 824.

[0149] Therefore, the T-slot bolt 850 is movable along the groove 821 while supporting the upper ends 823a of the pair of first brackets 823 and the upper ends 824a of the pair of second brackets 824. This allows the pair of inspection hatch covers 814 (see Figure 36) to be kept open by folding them.

[0150] As described above, by using the T-slot bolt 850, the modified version of the ninth embodiment can obtain the same effects and advantages as the door opening and closing device 810 of the ninth embodiment.

[0151] <Door opening and closing device of the 10th embodiment> Figure 38 is a cross-sectional view of the door opening and closing device 910 in the tenth embodiment. As shown in Figure 38, the door opening and closing device 910 includes an expansion case 912, a fall prevention plate 913, a retaining plate (opening fixing part) 914, and an inspection cover 915, replacing the expansion case 31, support bracket 44, stopper plate 43, and inspection cover 27 of the first embodiment. The expansion case 912 has a vertical wall 917 in place of the vertical wall 31a of the expansion case 31 in the first embodiment.

[0152] The lower end of the vertical wall 917 has a support portion (connecting member) 921, a locking projection 923, and a locking recess 924. The support portion 921 is formed in a substantially U-shaped cross section that opens upward so as to support the inspection hatch cover 915, which will be described later. The support portion 921 extends, for example, along the longitudinal direction of the rail 14. The support portion 921 is provided on the same plane as the inspection hatch cover 915 in the vertical direction when the inspection hatch cover 915, which will be described later, is closing the inspection hatch 40.

[0153] The locking projection 923 protrudes from the vertical wall 917 toward the work space 22 so as to be able to position the inspection hatch cover 915, which will be described later. The locking recess 924 is formed in a recessed shape so as to be able to lock the fall prevention plate 913, which will be described later. For example, one or two locking projections 923 and locking recesses 924 are formed along the longitudinal direction of the rail 14. The number of locking projections 923 and locking recesses 924 can be arbitrarily selected.

[0154] The fall prevention plate 913 is fixed to the bracket fixing part 31d, for example, by tightening a bolt 45 and a nut 46. When the fall prevention plate 913 is fixed to the bracket fixing part 31d, the tip of the lower end 913a is locked into the locking recess 924. The retaining plate 914 is fixed, for example, to the bracket fixing portion 31d together with the fall prevention plate 913 by tightening bolts 45 and nuts 46. The fall prevention plate 913 and the retaining plate 914 are formed in pairs, for example, corresponding to the locking projection 923 and the locking recess 924. The number of fall prevention plates 913 and retaining plates 914 can be arbitrarily selected.

[0155] The inspection hatch cover 915 has a fixing portion 926 at the indoor end. The fixing portion 926 is rotatably formed relative to the support portion 921. The fixing portion 926 has a frame portion 927, a rod portion 928, and a corner portion 929. The frame portion 927 has a first frame portion 927a and a second frame portion 927b. The first frame portion 927a is formed in a substantially U-shaped cross section, for example, to open to the support portion 921. The second frame portion 927b extends, for example, from the tip of the first frame portion 927a along the bottom portion 927a1. The rod portion 928 is integrally formed at the tip of the second frame portion 927b. The corner portion 929 is integrally formed at the intersection of the bottom portion 927a1 and the side portion 927a2 of the first frame portion 927a. The rigidity of the fixing portion 926 is ensured, for example, by the rod portion 928 and the corner portion 929.

[0156] The fixing portion 926 is supported by the support portion 921 when the inspection hatch cover 915 is fixed to the cover fixing wall 28a of the fixing bracket 28 by bolts 32. Specifically, the fixing portion 926 is supported with the rod portion 928 and the second frame portion 927b resting on the bottom portion 921a of the support portion 921, and the side portion 927a2 of the first frame portion 927a in contact with the first side portion 921b of the support portion 921. In this state, the corner portion 929 contacts the lower end of the locking projection portion 923. As a result, the fixing portion 926 is supported by the support portion 921 with its vertical movement restricted and its movement toward the interior restricted. As a result, the inspection hatch cover 915 is supported by the bolts 32 and the support portion 921 so that the equipment housing portion 21 and the working space portion 22 (specifically, the inspection hatch 40) can be opened and closed.

[0157] Next, the operation of fixing (attaching) the inspection hatch cover 915 to the support part 921 and the cover fixing wall 28a will be explained with reference to Figures 38 to 40. Figure 39 is a cross-sectional view illustrating the operation of hooking the fixing portion 926 of the inspection hatch cover 915 onto the support portion 921 of the vertical wall 917 in the tenth embodiment. As shown in Figure 39, the fixing portion 926 of the inspection hatch cover 915 is oriented upward as indicated by the dashed line. The rod portion 928 of the upward-oriented fixing portion 926 is hooked onto the support portion 921 of the vertical wall 917 as indicated by the arrow. The inspection hatch cover 915 is supported in a state where it is suspended from the support portion 921 via the rod portion 928.

[0158] Figure 40 is a cross-sectional view illustrating the operation of fixing the inspection hatch cover 915 to the support portion 921 and the cover fixing wall 28a in the tenth embodiment. As shown in Figure 40, with the fixing part 926 hooked onto the support part 921, the fall prevention plate 913 and the retaining plate 914 are placed on the bracket fixing part 31d as indicated by the arrows, and fixed to the bracket fixing part 31d with bolts 45 and nuts 46. In this state, the tip of the lower end 913a of the fall prevention plate 913 is locked into the locking recess 924.

[0159] With the fall prevention plate 913 and the retaining plate 914 fixed to the bracket fixing part 31d, the inspection hatch cover 915 rotates around the rod part 928 as indicated by the arrows up to the cover fixing wall 28a. The side part 927a2 of the fixing part 926 is positioned away from the first side part 921b of the support part 921, with a gap on the outdoor side.

[0160] In this state, for example, the fixing portion 926 of the inspection hatch cover 915 may lift upward from the support portion 921. In this case, the fixing portion 926 can come into contact with the lower end 913a of the fall prevention plate 913. Therefore, the lifting of the fixing portion 926 can be kept to a minimum. By keeping the lifting of the fixing portion 926 to a minimum, it is possible to prevent the fixing portion 926 from falling from the support portion 921 by lifting upward. With the inspection hatch cover 915 rotated to the cover fixing wall 28a, the inspection hatch cover 915 is slid horizontally towards the interior of the room as indicated by the arrow. By moving the inspection hatch cover 915 towards the interior of the room, the side portion 927a2 of the fixing portion 926 comes into contact with the first side portion 921b of the support portion 921.

[0161] As shown in Figure 38, when the side portion 927a2 contacts the first side portion 921b, the corner portion 929 of the fixing portion 926 contacts the lower end of the locking projection 923. Therefore, the fixing portion 926 is supported by the support portion 921 with its vertical movement restricted and its movement toward the interior restricted. In this state, the inspection hatch cover 915 is fixed to the cover fixing wall 28a with bolts 32. This completes the process of fixing (attaching) the inspection hatch cover 915 to the support part 921 and the cover fixing wall 28a.

[0162] Next, the operation of opening the inspection hatch cover 915 will be explained based on Figures 41 and 42. Figure 41 is a cross-sectional view illustrating the operation of opening the inspection hatch cover 915 in the tenth embodiment. As shown in Figure 41, remove the bolt 32 (see Figure 38) from the cover fixing wall 28a. With the bolt 32 removed, move the inspection hatch cover 915, shown by the dashed line, outwards as indicated by the arrow, so that the rod portion 928 of the fixing portion 926 comes into contact with the second side portion 921c of the support portion 921. With the rod portion 928 in contact with the second side portion 921c, rotate the inspection hatch cover 915 around the rod portion 928 as indicated by the solid line as shown by the arrow until the inspection hatch cover 915 is open.

[0163] Figure 42 is a cross-sectional view illustrating the operation of holding the inspection hatch cover 915 in the open position in the tenth embodiment. Note that the fall prevention plate 913 is omitted in Figure 42 to facilitate understanding of the configuration. As shown in Figure 42, by moving the inspection hatch cover 915 inward as indicated by the arrow, the side portion 927a2 of the fixing portion 926 comes into contact with the second side portion 921c of the support portion 921, and the corner portion 929 comes into contact with the bottom portion 921a of the support portion 921.

[0164] In this state, loosening the nut 46 on the bolt 45 rotates the retaining plate 914, shown by the dashed line, as indicated by the arrow. By rotating the retaining plate 914, the lower end 914a of the retaining plate 914, shown by the solid line, comes into contact with the side portion 927a2 of the fixing portion 926. The lower end 914a of the retaining plate 914 protrudes below the ceiling plate 23. Therefore, by pressing the lower end 914a against the side portion 927a2, the rotation of the inspection hatch cover 915 in the closing direction is restricted. This holds the inspection hatch cover 915 in the open position at the lower end 914a of the retaining plate 914.

[0165] As described above, the door opening and closing device 910 in the tenth embodiment can be made more aesthetically pleasing by covering the inspection opening 40 of the work space 22 from below with the inspection opening cover 915. Furthermore, when installing the inspection hatch cover 915, the lifting of the fixing part 926 can be kept to a minimum. Therefore, the inspection hatch cover 915 can be prevented from falling from the support part 921 by the fixing part 926 lifting upward. This makes it easier to attach the inspection hatch cover 915 to the support part 921 and the cover fixing wall 28a. Furthermore, by keeping the inspection hatch cover 915 in the open position, the inspection hatch cover 915 can be kept out of the way of inspection work. This improves the ease of installation, for example, when inspecting the door opening and closing device 910.

[0166] <Door opening and closing device of the 11th embodiment> Figure 43 is a cross-sectional view of the door opening and closing device 1010 in the 11th embodiment. As shown in Figure 43, the door opening and closing device 1010 is equipped with a support bracket 1014 and a stopper plate (opening fixing part) 1013 in place of the support bracket 44 and stopper plate 43 in the first embodiment.

[0167] The support bracket 1014 is fixed to the bracket fixing portion 31d of the expansion case 31, for example, by tightening a bolt 45 and a nut 46. The support bracket 1014 is, for example, an L-shaped plate-like member. The support bracket 1014 is positioned perpendicular to the longitudinal direction (i.e., the direction perpendicular to the plane of the paper) of the upright wall 42 in the inspection hatch cover 27. The lower end of the support bracket 1014 is fixed to the lower end of the stopper plate 1013 by tightening a bolt 1050 and a nut 51 (see Figure 2). Alternatively, a tapped hole may be provided in the stopper plate 1013, and the bolt 1050 may be fastened to the stopper plate 1013 without using a nut 51.

[0168] The stopper plate 1013 is a plate-shaped member. The stopper plate 1013 is positioned perpendicular to the longitudinal direction of the upright wall 42. The stopper plate 1013 is allowed to rotate around the shaft of the bolt 1050 by loosening the tightening of the bolt 1050 and nut 51. The rotational position of the stopper plate 1013 is fixed by tightening the bolt 1050 and nut 51.

[0169] Examples of bolts 1050 include wing bolts. By using a wing bolt as bolt 1050, it is possible to rotate the bolt 1050 manually. In this embodiment, a wing bolt is used as an example of bolt 1050, but bolt 1050 is not limited to wing bolts. As an alternative to a wing bolt, any fastening component with the same bolt diameter and a knob or projection on the bolt head that allows the bolt 1050 to be rotated manually can be used. Specifically, examples include eye bolts, knurled bolts, thumb screws, and fan bolts. When the inspection hatch cover 27 is closed, the stopper plate 1013 is fixed to the lower end of the support bracket 1014 with its extending end 1013a facing upward.

[0170] The support position of the stopper plate 1013 by the support bracket 1014 is set to be close to the vertical wall 31a of the expansion case 31. Furthermore, the support bracket 1014 and the stopper plate 1013 are positioned inside the expansion case 31 so that their lower ends do not protrude below the inspection opening 40 when the inspection opening cover 27 is closed. The number of support brackets 1014 and stopper plates 1013 can be arbitrarily selected. When multiple support brackets 1014 and stopper plates 1013 are to be installed, the multiple support brackets 1014 and multiple stopper plates 1013 are to be arranged along the longitudinal direction of the upright wall 42 of the inspection hatch cover 27.

[0171] Next, the operation of opening the inspection hatch cover 27 will be explained based on Figure 44. Figure 44 is a cross-sectional view illustrating the operation of the door opening / closing device 1010 in the 11th embodiment, which holds the inspection hatch cover 27 in the open position. As shown in Figure 44, remove the bolts 32 (see Figure 43) that secure the inspection hatch cover 27, which are indicated by dashed lines, and open the inspection hatch cover 27 around the pivot axis of the hinge member 41 as indicated by the arrows. This opens the inspection hatch 40 at the bottom of the expansion case 31. In this state, the upright wall 42 of the inspection hatch cover 27 is positioned below the inspection hatch 40.

[0172] With the upright wall 42 positioned below the inspection opening 40, loosening the bolt 1050 causes the stopper plate 1013, shown by the dashed line, to be displaced downwards around the shaft of the bolt 1050, as indicated by the arrow. By inclining the stopper plate 1013 downwards, the extended end 1013a of the stopper plate 1013 protrudes below the inspection opening 40 (i.e., the ceiling panel 23) in an inclined state. In this state, tightening the bolt 1050 fixes the extended end 1013a in a protruding state that is inclined below the inspection opening 40. The upright wall 42 of the inspection opening cover 27 comes into contact with the tip edge 1013b of the fixed extended end 1013a.

[0173] Here, the support bracket 1014 and the stopper plate 1013 are positioned perpendicular to the longitudinal direction of the upright wall 42. Therefore, the tip edge 1013b of the extended end 1013a of the stopper plate 1013 can abut against the upright wall 42. This allows the stopper plate 1013 to support the weight of the inspection hatch cover 27 in a compressive direction. Furthermore, the load acting from the stopper plate 1013 to the support bracket 1014 can be supported in the surface direction of the support bracket 1014. Therefore, the weight of the inspection hatch cover 27 restricts the rotation of the inspection hatch cover 27 in the closing direction without deforming the support bracket 1014 and the stopper plate 1013. As a result, the inspection hatch cover 27 can be held in the open position by the support bracket 1014 and the stopper plate 1013.

[0174] As described above, the door opening and closing device 1010 in the 11th embodiment, like the door opening and closing device 10 in the first embodiment, can house the support bracket 1014 and the stopper plate 1013 inside the case 13 when the inspection hatch cover 27 is closed. This allows for a good appearance when the inspection hatch cover 27 is closed. Furthermore, by holding the inspection hatch cover 27 in the open position with the support bracket 1014 and stopper plate 1013, the inspection hatch cover 27 can be kept out of the way of inspection work. This improves the ease of installation, for example, when inspecting the door opening and closing device 1010.

[0175] In particular, in the 11th embodiment, the door opening and closing device 1010 has the support bracket 1014 and stopper plate 1013 positioned perpendicular to the longitudinal direction of the upright wall 42. Therefore, the weight of the inspection hatch cover 27 can be properly supported by the stopper plate 1013 and support bracket 1014. As a result, the inspection hatch cover 27 can be held in the open position by the support bracket 1014 and stopper plate 1013, and the ease of installation when inspecting the door opening and closing device 1010 can be appropriately improved.

[0176] <Variation of the 11th embodiment> Figure 45 is a cross-sectional view of the door opening / closing device 1110 in a modified example of the 11th embodiment. As shown in Figure 45, the door opening and closing device 1110 is modified in which the stopper plate 1013 and support bracket 1014 of the 11th embodiment are replaced with a stopper plate (opening fixing part) 1113 and support bracket 1114.

[0177] The support bracket 1114 has, for example, an elongated hole 1114a, a first mounting hole 1114b (see Figure 46), and a second mounting hole 1114c at its lower end. The elongated hole 1114a extends vertically along the side opposite the vertical wall 31a at the lower end of the support bracket 1114. The first mounting hole 1114b and the second mounting hole 1114c are arranged vertically along the side facing the vertical wall 31a at the lower end of the support bracket 1114.

[0178] The stopper plate 1113 has an elongated hole 1113a and a mounting hole 1113b (see Figure 46). The stopper plate 1113 is attached to the lower end of the support bracket 1114 by the first bolt 1050A and nut 51, with the first bolt 1050A passing through the elongated holes 1113a and 1114a. The stopper plate 1113 is also attached to the lower end of the support bracket 1114 by the second bolt 1050B and nut 51, with the second bolt 1050B passing through the mounting hole 1113b and the first mounting hole 1114b.

[0179] In this state, the stopper plate 1113 is fixed at the lower end of the support bracket 1114 in a state where it is inclined downward toward the interior of the room. Examples of the first bolt 1050A and the second bolt 1050B include wing bolts, as in the 11th embodiment.

[0180] Next, the operation of opening the inspection hatch cover 27 will be explained based on Figures 46 and 47. Figure 46 is a cross-sectional view illustrating the operation of opening the inspection cover 27 of the door opening / closing device 1110 in a modified example of the 11th embodiment. As shown in Figure 46, the bolts 32 (see Figure 45) that secure the inspection hatch cover 27 are removed, and the inspection hatch cover 27 is opened around the pivot axis of the hinge member 41. This opens the inspection hatch 40 at the bottom of the expansion case 31. In this state, the upright wall 42 of the inspection hatch cover 27 is positioned below the inspection hatch 40.

[0181] With the upright wall 42 positioned below the inspection opening 40, loosen the first bolt 1050A and remove the second bolt 1050B (see Figure 45). With the first bolt 50A loosened and the second bolt 50B removed, move the stopper plate 1113 downward along the elongated hole 1114a as indicated by the arrow.

[0182] Figure 47 is a cross-sectional view illustrating the operation of the door opening / closing device 1110 in which the inspection hatch cover 27 is held in the open position in a modified example of the 11th embodiment. As shown in Figure 47, with the stopper plate 1113 moved downward, the stopper plate 1113 is moved inclined along the elongated hole 1113a as indicated by the arrow. By moving the stopper plate 1113 as indicated by the arrow, the leading edge 1113c of the stopper plate 1113 protrudes below the inspection opening 40 (i.e., the ceiling panel 23). In this state, the leading edge 1113c of the stopper plate 1113 comes into contact with the upright wall 42.

[0183] With the tip edge 1113c of the stopper plate 1113 in contact with the upright wall 42, the first bolt 1050A is tightened to position the stopper plate 1113 in contact with the upright wall 42. With the stopper plate 1113 in this position, the second bolt 1050B is tightened to fix the stopper plate 1113 so that it does not rotate. In this state, the support bracket 1114 and the stopper plate 1113 restrict the rotation of the inspection hatch cover 27 in the closing direction. As a result, the inspection hatch cover 27 can be held in the open position by the support bracket 1114 and the stopper plate 1113.

[0184] As described above, the door opening and closing device 1110 in the modified version of the 11th embodiment can obtain the same operation and effects as the door opening and closing device 1010 of the 11th embodiment. In other words, similar to the door opening and closing device 10 of the first embodiment, the support bracket 1114 and stopper plate 1113 can be stored inside the case 13 when the inspection hatch cover 27 is not opened (closed). This allows for good appearance quality when the inspection hatch cover 27 is closed. Furthermore, by holding the inspection hatch cover 27 in the open position with the support bracket 1114 and stopper plate 1113, the inspection hatch cover 27 can be kept out of the way of inspection work. This improves the ease of installation, for example, when inspecting the door opening and closing device 1110.

[0185] In particular, in the modified version of the 11th embodiment, the door opening / closing device 1110 can secure the stopper plate 1113 to the support bracket 1114 in a non-rotating manner using two bolts, the first bolt 1050A and the second bolt 1050B. Therefore, the inspection hatch cover 27 can be properly held in the open position by the support bracket 1114 and the stopper plate 1113. This makes it possible to further improve the workability when inspecting the door opening / closing device 1110, for example.

[0186] It should be noted that the present invention is not limited to the embodiments described above, and various design modifications are possible without departing from the spirit of the invention. For example, in the first embodiment, the case 13 is composed of a separate case body 30 and expansion cases 31, 131, but the case body 230 and the expansion case 231 may be formed as an integrated case 213, as in the door opening and closing device 210 in the second modified example of the first embodiment shown in Figure 5.

[0187] Furthermore, although the embodiment is applied to an automatic door where a pair of doors 3 open and close to the left and right, the number of doors that open and close the entrance / exit may be one or three or more.

[0188] Furthermore, in the embodiments disclosed herein, those composed of multiple objects may be integrated, and conversely, those composed of a single object may be divided into multiple objects. Whether or not they are integrated, the invention is only necessary to achieve its objective. [Explanation of Symbols]

[0189] 2... Entrance / Exit, 3... Door, 10, 310, 350, 410... Door opening / closing device, 11... Door drive unit, 12... Door control unit, 13... Case, 14... Rail, 15... Roller, 16... Door hanger, 21... Equipment housing section, 22... Working space section, 23... Ceiling panel, 27, 312, 352, 915... Inspection hatch cover, 27a... Center of inspection hatch cover, 30... Case body, 30a... Vertical wall (side), 31, 912... Expansion case -, 32... Bolt (fixing device), 40... Inspection opening, 43, 1013, 1113... Stopper plate (regulating piece, opening fixing part), 314... Hinge member (connecting member), 314a... Rotating shaft, 359... Wiring, 362... Temporary fixing part, 361... Wiring holding part, 412... Support bracket (support part), 414, 432... Fixing bracket, 914... Holding plate (regulating piece, opening fixing part), 921... Support part (connecting member)

Claims

1. A door drive unit that drives the door to open and close, A door control unit that controls the door drive unit, A case having an equipment housing section that houses the door drive unit and the door control unit at a position above the ceiling panel of the building in which the door is installed, and a working space section that communicates with the equipment housing section at a position above the ceiling panel, and an inspection opening provided below the working space section, A door opening and closing device comprising: an inspection port cover connected to the lower end of the case, which closes the inspection port so that it can be opened and closed; and an inspection port cover connected to the lower end of the case.

2. The door opening and closing device according to claim 1, further comprising an opening fixing part for holding the inspection hatch cover in an open state.

3. The inspection hatch cover is rotatably supported on the edge of the inspection hatch, The opening fixing portion is positioned inside the case and has a restricting piece that, when the inspection hatch cover is open, at least a portion of it can protrude below the ceiling panel. The door opening and closing device according to claim 2, wherein the restricting piece restricts the rotation of the inspection hatch cover in the closing direction when at least a portion of it protrudes below the ceiling plate.

4. The aforementioned case is, The case body forming the equipment housing section, The system comprises an extension case that forms the aforementioned workspace and has the inspection port cover connected to its lower end, The door opening and closing device according to any one of claims 1 to 3, wherein the expansion case is detachably attached to the case body.

5. The equipment housing section is positioned so as to face the door in the vertical direction. The equipment housing section and the work space section are arranged side by side along the horizontal direction, and the equipment housing section is positioned closer to the door than the work space section. The inspection port cover is rotatably mounted around a pivot axis provided on the equipment housing side of the inspection port. The door opening and closing device according to claim 1, wherein the rotation axis is aligned in the horizontal direction.

6. The inspection hatch cover is connected to the case via the connecting member having the rotating shaft, The door opening and closing device according to claim 5, wherein, when the inspection hatch cover is in the state of closing the inspection hatch, the connecting member is provided above the inspection hatch cover in the vertical direction.

7. The door opening and closing device according to claim 1 or claim 5, wherein the inspection hatch cover and the case each have a temporary fixing part that is detachably connected when the inspection hatch is closed by the inspection hatch cover.

8. The door opening and closing device according to claim 1 or claim 5, wherein the inspection hatch cover is provided with a wiring holding portion for holding wiring used for opening and closing the door.

9. The equipment housing section and the work space section are arranged side by side along the horizontal direction, and the equipment housing section is positioned closer to the door than the work space section. The aforementioned case includes a support portion provided on the side opposite to the working space portion of the equipment housing portion, and located below it. The door opening and closing device according to claim 1 or claim 5, wherein the support portion supports the equipment housing portion side of the inspection opening cover from the center in the first direction when the inspection opening cover is closed over the inspection opening, with the direction in which the equipment housing portion and the work space portion are aligned being defined as the first direction.

10. The aforementioned door drive unit is A rail arranged along the opening and closing direction of the aforementioned door, A door hanger having rollers that roll on the rail, and suspending and supporting the door on the rail, Equipped with, The door opening and closing device according to claim 9, wherein the support portion is fixed to the rail.

11. A workspace expansion unit used in a door opening and closing device, comprising a door drive unit for opening and closing a door, a door control unit for controlling the door drive unit, and a case body for housing the door drive unit and the door control unit, wherein the door drive unit and the door control unit are positioned above the ceiling panel of the building on which the door is installed. An extension case having a working space that communicates with the interior of the case body at a position above the ceiling panel, and an inspection opening located below the working space, and which is detachably attached to the case body, A workspace expansion unit comprising: an inspection port cover rotatably connected to the lower end of the expansion case and capable of opening and closing the inspection port; and an inspection port cover.

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