Fire prevention equipment

Abstract

To improve smoke blocking performance while eliminating the need for a vertical frame.SOLUTION: Fire prevention equipment 10 includes a plurality of steel doors 50 that are arranged horizontally and have the same opening style, which open / close openings G between them as they rotate about an upper rotation axis 22 and a lower rotation axis 32, 72 that extend in the vertical direction, and a cover portion 56 that is provided along a side end portion 50E of one of the adjacent steel doors 50 when the opening G is in a closed state, and that extends from the side end portion 50E onto a surface 50A of the side end portion 50E of the other adjacent steel door 50.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a fire prevention system. [Background technology]

[0002] BACKGROUND ART A fire-resistant partition wall provided with a plurality of shielding plates that rotate around a horizontally extending rotation axis is known (see, for example, Patent Document 1).

[0003] Also known is a fire blind that includes a plurality of fire-resistant shielding plates that rotate around a horizontally extending rotation axis (see, for example, Patent Document 2).

[0004] Furthermore, a fire-prevention louver unit is known that includes a plurality of louvers that rotate around a rotation axis that extends in the vertical direction (see, for example, Patent Document 3). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-146949 [Patent Document 2] Japanese Patent Application Laid-Open No. 2002-147138 [Patent Document 3] Japanese Patent Publication No. 2022-120730 Summary of the Invention [Problem to be solved by the invention]

[0006] In the fire-resistant partition wall disclosed in Patent Document 1, multiple shielding plates rotate around horizontally extending rotation axes, so vertical frames are required to support the rotation axes of these shielding plates. Therefore, for example, there is a possibility that the opening width may become narrower.

[0007] Similarly, in the fire blinds disclosed in Patent Document 1, multiple fire-resistant shielding plates rotate around horizontally extending rotation axes, so vertical frames are required to support the rotation axes of these fire-resistant shielding plates, which may result in a narrower opening width, for example.

[0008] On the other hand, in the louver unit disclosed in Patent Document 3, the multiple louvers rotate around a rotation axis that extends in the vertical direction, making it possible to eliminate the need for a vertical frame.

[0009] However, in the louver unit disclosed in Patent Document 3, there is a possibility that smoke may pass through the gaps between adjacent louvers in the event of a fire, so there is room for improvement in terms of smoke blocking performance.

[0010] In consideration of the above facts, the present invention aims to improve smoke-blocking performance while eliminating the need for vertical frames. [Means for solving the problem]

[0011] The fire prevention equipment described in claim 1 comprises a plurality of steel doors that are arranged horizontally and have the same opening style, and that open and close the openings between them as they rotate about a rotation axis that runs in the vertical direction, and a cover portion that is provided along the side edge of one of the adjacent steel doors when the openings are closed, and that extends from the side edge onto the surface of the side edge of the other adjacent steel door.

[0012] According to the fire prevention equipment of claim 1, the multiple steel doors have the same opening direction. These steel doors are arranged horizontally and open and close the openings between them as they rotate around a vertical axis. Therefore, in this invention, compared to a configuration in which the steel doors rotate around a horizontal axis, the vertical frame can be omitted. Therefore, for example, the opening width can be increased.

[0013] Furthermore, in a closed state where the opening between adjacent steel doors is closed, a cover portion is provided along the side edge of one of the adjacent steel doors. In the closed state, the cover portion extends from the side edge of one adjacent steel door onto the surface of the side edge of the other adjacent steel door. This cover portion covers the gap between the side edges of the adjacent steel doors in the closed state. Therefore, the smoke blocking performance of the fire prevention equipment can be improved.

[0014] The fire prevention equipment described in claim 2 is the fire prevention equipment described in claim 1, wherein the rotation shaft is provided on one end side of the steel door in the width direction.

[0015] According to the fire prevention equipment of claim 2, a rotation shaft is provided on one end side of the steel door in the width direction. The steel door rotates around this rotation shaft, thereby opening and closing the opening between adjacent steel doors.

[0016] By providing a rotation axis at one end of the steel door in this way, rotation space for the steel door is not required at that end, which increases the flexibility of installing fire prevention equipment.

[0017] The fire prevention equipment described in claim 3 is the fire prevention equipment described in claim 1, which is provided with a stepped portion along the side edge of the other adjacent steel door in the closed state, on which the cover portion is placed.

[0018] According to the fire prevention equipment of claim 3, in a closed state where the opening between the adjacent steel doors is closed, a step portion is provided along the side edge of the other adjacent steel door. By disposing a cover portion on this step portion, it is possible to cover the gap between the side edges of the adjacent steel doors while improving the design of the fire prevention equipment.

[0019] The fire prevention equipment described in claim 4 is the fire prevention equipment described in claim 1, and further comprises an upper frame that is positioned above the steel door and supports the steel door via the rotating shaft, and a smoke-blocking hanging wall portion that is provided on the upper frame, extends downward from the upper frame, and faces the steel door in the closed state.

[0020] According to the fire prevention equipment of claim 4, the upper frame is disposed above the steel door and supports the steel door via a rotation shaft. The upper frame is provided with a smoke-blocking hanging wall. The smoke-blocking hanging wall extends downward from the upper frame and faces the steel door in a closed state where the opening between adjacent steel doors is closed. The smoke-blocking hanging wall covers the gap between the upper frame and the steel door. Therefore, the smoke-blocking performance of the fire prevention equipment can be improved.

[0021] The fire prevention equipment described in claim 5 is the fire prevention equipment described in any one of claims 1 to 4, and comprises a stopper device that can be switched between a restrictive state that restricts the rotation of the steel door and an allowable state that allows the rotation of the steel door, a smoke detector that detects smoke, and a control device that switches the stopper device from the restrictive state to the allowable state when the smoke detector detects smoke.

[0022] According to the fire prevention equipment of claim 5, the stopper device can be switched between a restricting state that restricts the rotation of the steel door and an allowing state that allows the rotation of the steel door. As a result, for example, when the steel door is in an open state, the stopper device can be switched from the allowing state to the restricting state to maintain the open state of the steel door.

[0023] Furthermore, the smoke detector detects smoke. When the smoke detector detects smoke, the control device switches the stopper device from a restrictive state to an permissive state. This allows, for example, when the smoke detector detects smoke, the steel door maintained in an open state by the stopper device to be rotated to transition to a closed state that closes the opening between adjacent steel doors. Therefore, for example, in the event of a fire, smoke can be blocked early by the fire prevention equipment. [Effects of the Invention]

[0024] As described above, according to the present invention, it is possible to improve smoke blocking performance while eliminating the need for vertical frames. [Brief explanation of the drawings]

[0025] [Figure 1] 1 is an elevation view of a fire door constituting a fire prevention system according to one embodiment, viewed from the inside (room side). [Figure 2] FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. [Figure 3] FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. [Figure 5] FIG. 5 is a cross-sectional view taken along line 5-5 in FIG. [Figure 6] FIG. 6 is an enlarged cross-sectional view of a portion of FIG. 5. [Figure 7] FIG. 7 is a partially enlarged cross-sectional view corresponding to FIG. 6, showing the steel door in an open state. [Figure 8] 1 is a perspective view of a side end surface of a steel door provided with a stopper device in one embodiment, viewed obliquely from the outside (outside the room). FIG. [Figure 9] FIG. 9 is an elevational view showing a side end surface of a steel door provided with the stopper device shown in FIG. 8. DETAILED DESCRIPTION OF THE INVENTION

[0026] Hereinafter, an embodiment will be described with reference to the drawings.

[0027] (Fire prevention equipment) 1 shows a fire prevention system 10 according to this embodiment. As an example, the fire prevention system 10 is designated as a specific fire prevention system. The fire prevention system 10 includes a fire door 12, a smoke detector 14, and a control device 16.

[0028] (Fire door) As an example, the fire door 12 is disposed on the inside (inside) of a window (not shown) so as to face the window. Also, as an example, the fire door 12 has sound insulation and blind functions (functions for adjusting the amount of light entering and for providing privacy). The fire door 12 has an upper frame 20, a lower frame 30, a plurality of steel doors 50, an opening / closing link mechanism 60, and an automatic hinge 70.

[0029] Note that arrow H shown as appropriate in each drawing indicates the up-down direction (height direction) of the fire door 12, and arrow W indicates the width direction of the fire door 12. Also, arrow T indicates one side (outside, room side) of the thickness direction (outside direction) of the fire door 12.

[0030] (Upper frame) 2, the upper frame 20 is made of, for example, steel, and is arranged above the plurality of steel doors 50 along the width direction of the fire door 12. The upper frame 20 is provided with a plurality of upper rotation shafts 22 that rotatably support the upper ends of the plurality of steel doors 50. The upper rotation shafts 22 are an example of rotation shafts.

[0031] The multiple upper rotation shafts (top pivots) 22 are arranged in the vertical direction and are spaced apart in the longitudinal direction (direction of arrow W) of the upper frame 20. Each upper rotation shaft 22 rotatably supports the steel door 50 in a suspended state. Below this upper frame 20, a lower frame 30 is provided.

[0032] The upper frame 20 is provided with a smoke-blocking hanging wall portion 24, which will be described later.

[0033] (lower frame) As shown in Fig. 3, the lower frame 30 is made of, for example, steel, and is arranged below the multiple steel doors 50 along the width direction of the fire door 12. The lower frame 30 is arranged (stored) in an underfloor space 42 of a floor material 40, and is supported, for example, by a slab 44. The lower frame 30 is provided with multiple lower rotating shafts 32 and bearings 34 (see Fig. 4) that rotatably support the lower ends of the steel doors 50. The lower rotating shafts 32 are an example of a rotating shaft.

[0034] The multiple lower rotating shafts (floor hinges) 32 are arranged along the vertical direction and are spaced apart in the longitudinal direction of the lower frame 30. Each lower rotating shaft 32 is arranged below the corresponding upper rotating shaft 22 (see FIG. 1) and coaxially with the upper rotating shaft 22.

[0035] The lower rotating shaft 32 protrudes upward from the floor material 40 and is rotatably inserted into a bearing 52 provided at the lower end of the steel door 50. The lower end of the steel door 50 is rotatably supported by this lower rotating shaft 32.

[0036] As shown in FIG. 4, the bearing 34 is disposed in the underfloor space 42 of the floor material 40, and rotatably supports the lower rotation shaft 72 of the auto hinge 70 (described later) provided on the steel door 50.

[0037] (Steel door) As shown in Fig. 1, the multiple steel doors 50 are arranged with their longitudinal direction in the height direction (arrow H direction) of the fire door 12, and are also arranged in the width direction (horizontal direction, arrow W direction) of the fire door 12. The multiple steel doors 50 have the same opening style. As an example, each steel door 50 is a suspended door, and its upper end is rotatably suspended and supported by the upper frame 20 via the above-mentioned upper rotation shaft 22. Meanwhile, the lower end of each steel door 50 is rotatably supported by the lower frame 30 via the above-mentioned lower rotation shafts 32, 72.

[0038] As shown in Figure 5, the steel door 50 is made of steel plates or the like, and its cross section is a hollow rectangle. The steel plates or the like that form the steel door 50 have a thickness equal to or greater than a predetermined value so as to satisfy the fire resistance performance required for specific fire prevention equipment. An upper rotation shaft 22 (see Figure 1) and lower rotation shafts 32, 72 are provided on one end side (door base side) in the width direction of the steel door 50.

[0039] The multiple steel doors 50 are capable of opening and closing the openings G between each other, i.e., between adjacent steel doors 50, as they rotate around the upper rotation shaft 22 (see Figure 1) and the lower rotation shafts 32, 72. Specifically, as each steel door 50 rotates around the upper rotation shaft 22 and the lower rotation shaft 32, 72, it transitions between a closed state in which the opening G between the adjacent steel doors 50 is closed as shown in FIG. 6, and an open state in which the opening G between the adjacent steel doors 50 is opened as shown in FIG. 7.

[0040] As shown in Fig. 6, when the multiple steel doors 50 are in a closed state, the adjacent steel doors 50 are arranged in a straight line along the width direction of the fire door 12 in a plan view. This closes the opening G between the adjacent steel doors 50. On the other hand, as shown in Fig. 7, when the multiple steel doors 50 are in an open state, the steel doors 50 are inclined relative to the width direction of the fire door 12 in a plan view. This opens the opening G between the adjacent steel doors 50.

[0041] (Opening and closing link mechanism) As shown in Figures 6 and 7, adjacent steel doors 50 are connected via an opening / closing link mechanism 60 so that these steel doors 50 open and close in an interlocking manner. In this embodiment, as an example, five steel doors 50 are connected via the opening / closing link mechanism 60 to form a unit (door unit), and of the five steel doors 50, only the steel door 50 located on one end side is provided with a pull tab (handle) 54 (see Figure 1). By operating this pull tab 54, the five steel doors 50 are configured to open and close in an interlocking manner.

[0042] The number and arrangement of the pull tabs 54 can be changed as appropriate.

[0043] The opening / closing link mechanism 60 has a plurality of arm links 62 fixed to the plurality of steel doors 50, respectively, and a connecting link 64 connecting the plurality of arm links 62. The arm link 62 has a pair of arm portions 62A, 62B that form an L-shape in plan view.

[0044] One arm portion 62A is disposed along the thickness direction of the steel door 50, and one end portion thereof is fixed to the upper rotation shaft 22 and the lower rotation shafts 32, 72 of the steel door 50. The other arm portion 62B is provided to the other end portion of this one arm portion 62A.

[0045] The other arm portion 62B is disposed along the width direction of the steel door 50, and one end portion thereof is connected to the other end portion of one arm portion 62A. A connecting link 64 is rotatably connected to the other end portion of this other arm portion 62B.

[0046] The connecting link 64 is formed linearly in a plan view. When the steel doors 50 are in a closed state, the connecting link 64 is arranged along the width direction of the fire door 12, and overlaps with the other arm portion 62B of each of the arm links 62.

[0047] The connecting link 64 and the other end of each arm portion 62B are rotatably connected via a shaft 66 extending in the height direction of the fire door 12. As a result, as shown in Figure 7, when any one of the multiple steel doors 50 connected by the opening / closing link mechanism 60 is opened or closed, the opening / closing link mechanism 60 operates to open or close the remaining steel doors 50.

[0048] (Auto Hinge) As shown in FIG. 4, of the five steel doors 50 connected by the opening / closing link mechanism 60, the steel door 50 arranged on one end side is provided with an auto hinge 70.

[0049] The auto hinge 70 is an automatic closing device that automatically closes the open steel door 50 and transitions it to a closed state. The auto hinge 70 has a lower rotating shaft 72 and a hinge case 74 that houses the lower rotating shaft 72.

[0050] The lower rotation shaft 72 protrudes downward from the lower end of the steel door 50 and is rotatably supported by a bearing 34 provided on the lower frame 30. The upper end side of this lower rotation shaft 72 is housed in a hinge case 74.

[0051] The hinge case 74 houses an elastic body (not shown), such as a torsion spring. The elastic body is elastically deformed when the steel door 50 transitions from a closed state to an open state. By rotating the lower rotation shaft 72 using the restoring force of this elastic body, the steel door 50 automatically transitions from an open state to a closed state.

[0052] (Stopper device) 8, the stopper device 80 is a door stopper device that stops the rotation of the steel door 50 at a predetermined position. In addition, as an example, the stopper device 80 is a floor-stop type electromagnetic release that is built into the steel door 50. This stopper device 80 has a case 82, a stopper member 84, an operating lever 88, a locking device 90, an unlocking button 92, and an unlocking device 94.

[0053] The case 82 is formed in a box shape. The case 82 is housed at the other end side in the width direction of the lower part of the steel door 50 (the door-tip side, the opposite side to the upper rotation shaft 22 and the lower rotation shafts 32, 72). A side end surface 82S of the case 82 is exposed from the side end surface 50S of the steel door 50. A stopper member 84 is housed in the case 82.

[0054] The stopper member 84 is formed in a rod shape and is disposed with its axial direction in the height direction of the steel door 50. In addition, an anti-slip member 86 made of rubber or the like is provided at the lower end of the stopper member 84.

[0055] 9, the stopper member 84 is housed in the case 82 so that its lower end can protrude downward from the lower end of the steel door 50. As shown by the solid line, this stopper member 84 transitions between a retracted state in which it is housed in the case 82 and the anti-slip member 86 provided at the lower end is separated from the floor surface 40A, and a stopper state in which it protrudes downward from the case 82 and the anti-slip member 86 provided at the lower end lands on the floor surface 40A, as shown by the two-dot chain line.

[0056] The anti-slip member 86 may be provided as needed and may be omitted as appropriate.

[0057] The stopper member 84 is connected to the case 82 by an elastic body such as a coil spring (not shown) housed in the case 82. The elastic body elastically deforms when the stopper member 84 transitions from the retracted state to the stopper state. The restoring force of this elastic body automatically transitions the stopper member 84 from the stopper state to the retracted state. The stopper member 84 can be operated by an operating lever 88.

[0058] The operating lever 88 is stored in the side of the case 82. The upper end of the operating lever 88 is rotatably connected to the case 82 via a rotation shaft (not shown) that extends in the thickness direction of the steel door 50. The operating lever 88 can be pulled out from an opening 82K formed in a side end surface 82S of the case 82. The opening 82K is formed in the shape of a slit that extends in the height direction of the steel door 50.

[0059] The upper end of the operating lever 88 is connected to the case 82 via a rotation shaft (not shown) that extends in the thickness direction of the steel door 50. As the operating lever 88 rotates around this rotation shaft, it can be pulled out from the opening 82K while drawing an arc.

[0060] The operating lever 88 is connected to the stopper member 84 via a link mechanism (not shown). As a result, when the operating lever 88 is pulled out from the case 82, the stopper member 84 is shifted from the retracted state to the stopper state, as shown by the two-dot chain line in FIG. 9.

[0061] Furthermore, when the stopper member 84 is shifted from the retracted state to the stopper state, a locking device 90 (see FIG. 8) provided on the case 82 is activated, and the stopper member 84 is held (locked) in the stopper state against the restoring force of the elastic body. In this state, the operating lever 88 is stored in the case 82. The operating lever 88 is an example of an operating part.

[0062] The locking device 90 is configured by, for example, a well-known latch mechanism. An unlocking button 92 and an unlocking device 94 are connected to the locking device 90, which release the holding (lock) of the stopper member 84 by the locking device 90.

[0063] The unlock button 92 is provided on the side end surface 82S of the case 82, and is exposed from the side end surface 50S of the steel door 50. The unlock button 92 is a push button that can be operated by a user. When the unlock button 92 is operated by a user, the locking device 90 is activated, and the hold (lock) of the stopper member 84 by the locking device 90 is released. As a result, the restoring force of the elastic body causes the stopper member 84 to transition from the stopper state to the retracted state. The unlock button 92 is an example of an unlock operation unit.

[0064] The unlocking device 94 is configured by an actuator such as an electromagnetic solenoid. When the unlocking device 94 is activated, the locking device 90 is activated, the hold (lock) of the stopper member 84 by the locking device 90 is released, and the stopper member 84 is shifted from the stopper state to the retracted state. The control device 16, which will be described later, is electrically connected to the unlocking device 94 via a wire or wirelessly.

[0065] (Cover part, stepped part) 6, when the steel doors 50 are in a closed state, a cover portion 56 is provided on a side end portion 50E of one of the adjacent steel doors 50. The cover portion 56 is a wall-like portion (plate-like portion) that covers the gap P between the adjacent steel doors 50 when the steel doors 50 are in a closed state.

[0066] The cover part 56 is provided along the side edge 50E of one of the steel doors 50, and is provided over the entire length of said side edge. The cover part 56 is formed into a wall (plate) shape made of steel plate or the like that is thinner than the steel door 50, and is provided so as to be continuous with the surface 50A of the one steel door 50 on the inside (inside the room).

[0067] When the steel doors 50 are in a closed state, the cover portion 56 extends from the side end portion 50E of one steel door 50 onto the inner (room side) surface 50A of the other steel door 50, covering the gap P between adjacent steel doors 50.

[0068] A step portion 58 on which the cover portion 56 is disposed is provided at the side end portion 50E of the other adjacent steel door 50. The step portion 58 is provided along the side end portion 50E of the other steel door 50, and is provided over the entire length of the side end portion 50E.

[0069] The stepped portion 58 is formed by recessing the surface 50A at the side end 50E of the other steel door 50 in a stepped shape. The bottom surface of the stepped portion 58 forms the surface 50A on the inside (inside) of the steel door 50. A cover portion 56 is placed on this stepped portion 58 when the steel door 50 is in a closed state.

[0070] When placed on the stepped portion 58, the cover portion 56 faces the bottom surface (surface 50A) of the stepped portion 58, and its surface on the indoor side is approximately flush with the surface 50A of the other steel door 50.

[0071] (Smoke-blocking hanging wall) 2, the upper frame 20 is provided with a smoke-blocking hanging wall portion 24. The smoke-blocking hanging wall portion 24 is a hanging wall portion that covers the gap between the upper frame 20 and the upper end of the steel door 50 when the steel door 50 is in a closed state. This smoke-blocking hanging wall portion 24 is disposed close to one side (outside) in the width direction of the upper frame 20 so as to face the outer (outside) surface 50B of the steel door 50 when the steel door 50 is in a closed state.

[0072] The smoke-barrier hanging wall portion 24 extends downward from the lower surface of the upper frame 20, and faces the outer surface 50B of the steel door 50 when the steel door 50 is in a closed state. In addition, a door stopper 26 is provided on the surface of the smoke-barrier hanging wall portion 24 that faces the steel door 50.

[0073] The door stopper 26 is formed of a cushioning material such as rubber, and comes into contact with the outer surface of the steel door 50 when the steel door 50 is in a closed state. This suppresses the door stopper sound of the steel door 50 hitting the smoke-blocking hanging wall portion 24.

[0074] The door stopper 26 may be omitted as appropriate. The smoke blocking hanging wall 24 may also be omitted as appropriate.

[0075] (smoke detector) As shown in Fig. 8, the smoke detector 14 is a device that detects smoke. The smoke detector 14 is installed, for example, on a ceiling (not shown). The smoke detector 14 is electrically connected to a control device 16 via a wire or wirelessly. When the smoke detector 14 detects smoke, it transmits a signal (hereinafter referred to as "smoke detection information") to the control device 16.

[0076] (Control device) The control device 16 is configured by, for example, a computer. The computer has, for example, a CPU, a memory as a temporary storage area, a non-volatile storage unit, etc. The control device 16 activates the lock release device 94 of the stopper device 80 based on the smoke detection information detected by the smoke detector 14.

[0077] More specifically, when the control device 16 receives smoke detection information from the smoke detector 14, it activates the unlocking device 94. This releases the hold (lock) of the stopper member 84 by the locking device 90, and the stopper member 84 transitions from the stopper state to the retracted state.

[0078] The control device 16 is an example of a control device. The control device 16 is not limited to a CPU and may have other processors. Examples of such processors include PLDs such as FPGAs, whose circuit configuration can be changed after manufacture, and dedicated electric circuits such as ASICs, whose circuit configuration is designed specifically to execute specific processing.

[0079] (action) Next, the operation of this embodiment will be described.

[0080] As shown in Fig. 1, in the fire prevention equipment 10 according to this embodiment, the multiple steel doors 50 have the same opening direction. These steel doors 50 are arranged horizontally and open and close the openings G between them as they rotate around the upper rotation shaft 22 and the lower rotation shafts 32, 72 that extend in the vertical direction. Therefore, in this embodiment, a vertical frame can be omitted compared to a configuration in which the steel doors 50 rotate around a rotation shaft that extends horizontally. Therefore, for example, in this embodiment, the opening width of the fire door 12 can be widened.

[0081] Furthermore, as shown in FIG. 6, in a closed state where the opening G between adjacent steel doors 50 is closed, a cover portion 56 is provided along the side end portion 50E of one of the adjacent steel doors 50.

[0082] When the steel doors 50 are in a closed state, the cover portion 56 extends from the side end portion 50E of one adjacent steel door 50 onto the surface 50A of the side end portion 50E of the other adjacent steel door 50. When the steel doors 50 are in a closed state, the cover portion 56 covers the gap P between the side end portions 50E of the adjacent steel doors 50. Therefore, the smoke blocking performance of the fire door 12 can be improved.

[0083] In this embodiment, in a closed state where the opening G between the adjacent steel doors 50 is closed, a step portion 58 is provided along the side end portion 50E of the other adjacent steel door 50. By arranging the cover portion 56 on this step portion, the gap P between the side end portions 50E of the adjacent steel doors 50 can be covered, while improving the design of the fire door 12.

[0084] Furthermore, the cover portion 56 is provided so as to be continuous with the surface 50A of one of the steel doors 50. This allows the design of the fire door 12 to be further improved.

[0085] Furthermore, when the steel door 50 is in the closed state, the outer surface of the cover portion 56 is substantially flush with the surface 50A of the other steel door 50. This further improves the design of the fire door 12.

[0086] 5, in this embodiment, the upper rotation shaft 22 and the lower rotation shafts 32, 72 are provided at one end in the width direction of the steel door 50. By providing the upper rotation shaft 22 and the lower rotation shafts 32, 72 at one end in the width direction of the steel door 50 in this way, no rotation space for the steel door 50 is required at that end. Therefore, the degree of freedom in installing the fire door 12 is improved.

[0087] 2, in this embodiment, the upper frame 20 is provided with a smoke-blocking hanging wall portion 24. The smoke-blocking hanging wall portion 24 extends downward from the upper frame 20 and faces the steel door 50 in a closed state where the opening G between adjacent steel doors 50 is closed. The smoke-blocking hanging wall portion 24 covers the gap Q between the steel door 50 and the upper frame 20 in the closed state. Therefore, the smoke-blocking performance of the fire door 12 is further improved.

[0088] Furthermore, a door stop material 26 is provided on the surface of the smoke barrier hanging wall 24 that faces the steel door 50. This door stop material 26 can reduce the door stop sound of the steel door 50 hitting the smoke barrier hanging wall 24.

[0089] 5, in this embodiment, five adjacent steel doors 50 are connected by an opening / closing link mechanism 60. As a result, the five steel doors 50 connected by the opening / closing link mechanism 60 open and close in an interlocking manner. Therefore, a user can open and close the five steel doors 50 by, for example, operating a pull tab 54 provided on one of the five steel doors 50 at one end.

[0090] This reduces the effort required to open and close the five steel doors 50. Furthermore, since there is no need to provide a pull tab 54 for each of the five steel doors 50, the number of parts required for the pull tab 54 can be reduced.

[0091] Furthermore, in this embodiment, a stopper device 80 is provided on the steel door 50 on one end side of the five steel doors 50 connected to the opening / closing link mechanism 60. The stopper device 80 is switchable between a restricting state that restricts the rotation of the steel door 50 and an allowing state that allows the rotation of the steel door 50.

[0092] More specifically, as shown in Figure 8, when the user opens the steel door 50 to a desired rotation angle, the user pulls up the operating lever 88 exposed on the side end surface 50S of the steel door 50. As a result, as shown by the two-dot chain line in Figure 9, the lower end of the stopper member 84 protrudes downward from the bottom end of the steel door 50, and the anti-slip member 86 provided on said lower end lands on the floor surface 40A. In other words, the stopper member 84 is switched from the retracted state to the restricted state. At this time, the locking device 90 is activated, and the stopper member 84 is held (locked) in the restricted state.

[0093] The stopper member 84 limits the rotation of the steel doors 50 around the upper rotation shaft 22 and the lower rotation shafts 32, 72. Therefore, the five steel doors 50 connected by the opening / closing link mechanism 60 can be maintained in the desired open state.

[0094] By providing the stopper device 80 to the steel door 50 in this way, the steel door 50 can be maintained in a desired open state.

[0095] On the other hand, as shown in Figure 8, when closing the steel door 50, the user presses the unlock button 92 exposed on the side end surface 50S of the steel door 50, which activates the unlock device 94 and releases the hold (lock) of the stopper member 84 by the lock device 90.

[0096] As a result, the stopper member 84 is stored in the case 82 by the restoring force of the elastic body (not shown), and the stopper member 84 is shifted from the restricted state to the retracted state. As a result, the steel door 50 is closed by the auto hinge 70 (see FIG. 1), and the five steel doors 50 connected by the opening / closing link mechanism 60 are shifted from the open state to the closed state.

[0097] In this way, the five steel doors 50 connected by the opening / closing link mechanism 60 open and close in unison. Therefore, there is no need to provide a stopper device 80 for each of the five steel doors 50. Therefore, the number of parts of the stopper device 80 can be reduced.

[0098] Furthermore, the control device 16 is electrically connected to the lock release device 94 of the stopper device 80. Based on smoke detection information detected by the smoke detector 14, the control device 16 activates the lock release device 94 and switches the stopper device 80 from the restrictive state to the permissive state.

[0099] As a result, for example, in the event of a fire, when the smoke detector 14 detects smoke, the steel door 50, which is maintained in the open position by the stopper device 80, can be automatically rotated to the closed position. Therefore, the fire door 12 can quickly block smoke.

[0100] Furthermore, the fire door 12 according to this embodiment has a blind function. In other words, by opening and closing the multiple steel doors 50, the amount of light entering the building can be adjusted or the building can be shielded from view. This improves the convenience of the fire door 12.

[0101] (Variation) Next, a modification of the above embodiment will be described.

[0102] In the above embodiment, the control device 16 controls the unlocking device 94 based on smoke detection information detected by the smoke detector 14. However, the control device 16 may control the unlocking device 94 of the stopper device 80 based on fire detection information detected by a fire detector such as a heat detector or a flame detector, not limited to the smoke detector 14. Furthermore, the control device 16 and the unlocking device 94 may be provided as needed and may be omitted as appropriate.

[0103] In the above embodiment, the stopper device 80 is of a floor-stop type. However, the stopper device 80 is not limited to the floor-stop type, and may be, for example, a frame-embedded type or a latch type. The stopper device 80 and the auto hinge 70 may be provided as needed and may be omitted as appropriate.

[0104] In the above embodiment, the cover portion 56 and the step portion 58 are provided on the inner (room side) surface 50A of the steel door 50. However, the cover portion 56 and the step portion 58 may be provided on the outer (room side) surface 50B of the steel door 50.

[0105] Furthermore, in the above embodiment, the cover portion 56 is provided so as to be continuous with the surface 50A of the steel door 50. However, the arrangement of the cover portion 56 can be changed as appropriate, and for example, the cover portion 56 and the surface 50A of the steel door 50 may not be continuous with each other, and a step may be formed between the cover portion 56 and the surface 50A of the steel door 50. Furthermore, the step portion 58 may be provided as needed, and may be omitted as appropriate.

[0106] Furthermore, in the above embodiment, five steel doors 50 are connected by the opening and closing link mechanism 60. However, the opening and closing link mechanism 60 can connect at least two steel doors 50. Furthermore, the opening and closing link mechanism 60 may be provided as needed, and may be omitted as appropriate.

[0107] In the above embodiment, the steel door 50 is a suspended door. However, the steel door 50 is not limited to a suspended door, and may be another type of door.

[0108] Furthermore, in the above embodiment, the upper rotation shaft 22 and the lower rotation shafts 32, 72 are disposed on one side in the width direction of the steel door 50. However, the upper rotation shaft 22 and the lower rotation shafts 32, 72 are not limited to being disposed on one side in the width direction of the steel door 50, and may be disposed, for example, in the center in the width direction of the steel door 50. Furthermore, the upper rotation shaft 22 and the lower rotation shaft 32 may be formed as an integrated rotation shaft.

[0109] The fire door 12 may be installed not only on the inside of a window (inside the room) but also on other openings. The soundproofing and blind functions may be provided to the fire door 12 as needed, and may be omitted as appropriate.

[0110] Although one embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, and one embodiment and various modified examples may be used in appropriate combination, and it goes without saying that the present invention can be implemented in various forms as long as it does not deviate from the gist of the present invention. [Explanation of symbols]

[0111] 10 Fire protection equipment 14 Smoke detector 16 Control device 20 Upper frame 22 Upper rotation axis (rotation axis) 24 Smoke-blocking hanging wall 32 Lower rotating shaft (rotating shaft) 50 Steel Door 50A surface 50E side end 56 Cover part 58 Stepped part 72 Lower rotating shaft (rotating shaft) 80 Stopper device G aperture

Claims

1. A plurality of steel doors that are arranged horizontally and have the same opening style and that open and close openings between each other as they rotate around a rotation axis along the vertical direction; In a closed state in which the opening is closed, a cover portion is provided along the side edge of one of the adjacent steel doors and extends from the side edge onto the surface of the side edge of the other adjacent steel door; Fire prevention equipment.

2. The rotation shaft is provided at one end side in the width direction of the steel door, The fire protection system according to claim 1.

3. In the closed state, a stepped portion is provided along the side edge of the other adjacent steel door, and the cover portion is disposed thereon. The fire protection system according to claim 1.

4. An upper frame disposed above the steel door and supporting the steel door via the rotation shaft; a smoke-blocking hanging wall portion provided on the upper frame, extending downward from the upper frame, and facing the steel door in the closed state; The fire protection system according to claim 1 .

5. A stopper device that can be switched between a restricting state that restricts the rotation of the steel door and an allowing state that allows the rotation of the steel door; A smoke detector that detects smoke, a control device that switches the stopper device from the restricting state to the allowing state when the smoke detector detects smoke; The fire prevention equipment according to any one of claims 1 to 4, comprising:

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