Fire shutter closing device

Abstract

To prevent releasing of a brake caused by an erroneous operation during construction in a fire shutter closing device.SOLUTION: The fire shutter closing device in which a movable body (third slider 71) present at a first position moves in a first direction to release a brake at a second position at the time of fire comprises movement restricting means (screw 76) for restricting movement of movable bodies (second slider 70, third slider 71, and second spring 72) in the first direction to be set at a second position during construction of the closing device. The movement restricting means (screw 76) is attachable to / detachable from the device, and abuts against the movable body (second slider 70) at the first position during construction to restrict movement of the movable bodies (second slider 70, third slider 71, and second spring 72) in the first direction.SELECTED DRAWING: Figure 29

Description

[Technical Field]

[0001] The present invention relates to a fire shutter, and more particularly to a closing device for a fire shutter that allows the shutter curtain to descend under its own weight in the event of a fire by releasing the brake through the operation of an automatic closing mechanism or a manual closing mechanism. [Background technology]

[0002] In the event of a fire, the automatic closing mechanism of the fire shutter is activated by a signal from the disaster prevention panel, releasing the brake, causing the shutter curtain to descend under its own weight and close the building opening. Fire shutters can also be operated manually to release the brake at any time and allow the shutter curtain to descend under its own weight, without a fire detection signal. In addition, fire shutters are equipped with a mechanical injury prevention device that mechanically stops the shutter curtain as it descends under its own weight to prevent evacuees from getting caught in the shutter curtain as it descends under its own weight.

[0003] A fire shutter equipped with such a closing device and a mechanical safety device is disclosed, for example, in Patent Document 1. The closing device disclosed in Patent Document 1 has a first movable part of the automatic closing mechanism connected by a wire to a second movable part of the operating unit that releases the brake of the shutter curtain. When a fire breaks out, the automatic closing mechanism receives a signal from a fire prevention panel that receives a fire signal from a detector, and the first movable part moves, moving the second movable part via the wire in the brake release direction, thereby pressing the brake release lever of the shutter curtain, releasing the brake and allowing the shutter curtain to descend under its own weight. The shutter curtain can also be manually lowered at any time by manual operation using the manual closing mechanism. The mechanical safety device is designed so that when the seat plate at the bottom of the shutter curtain detects a person or obstacle during its own descent, it moves the second movable part in the brake return direction, resetting the brake release lever and brake of the shutter curtain and temporarily suspending the shutter. After the shutter has temporarily suspend, if the obstacle is removed, the shutter curtain descends again under its own weight to close the opening.

[0004] Such a fire shutter closing device is completed through on-site installation using multiple components. Specifically, for example, work is required on-site, such as installing a unit consisting of multiple components in a predetermined position, connecting a manual closing wire to a predetermined movable element, and connecting a brake return wire to a predetermined movable element. During on-site installation, it is necessary to avoid the movable element accidentally moving in a direction that releases the brake of the opening / closing mechanism, causing the shutter curtain to start descending under its own weight. [Patent Document 1] Patent No. 6570986 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0005] The present invention aims to prevent the brake from being released due to a malfunction in a fire shutter closing device during installation.

[0006] The technical means adopted by the present invention are: In a closing device for a fire shutter, a movable body that is in a first position moves in a first direction to a second position in the event of a fire, and the brake is released. The closing device is provided with a movement restricting means for restricting the movable body from moving in the first direction to the second position when the closing device is installed. A fire shutter closing device.

[0007] In one aspect, the movement restricting means is movable or detachable from the device, and during installation, is in a first position and directly or indirectly abuts or engages with the movable body, restricting movement of the movable body in a first direction. In one embodiment, the first position of the movable body is determined by the movable body coming into contact with or locking against the movement restricting means that is in the first position.

[0008] In one embodiment, the movable body is the second slider in a slider unit including a second slider, a third slider, and a second spring provided between the second slider and the third slider; When the second slider moves in a first direction from the first position to the second position, a slider unit including the third slider and the second spring moves together to release the brake of the opening and closing machine, and the third slider compresses the second spring to move in a second direction toward the first position independently of the second slider to release the brake of the opening and closing machine, The movement restricting means restricts movement of the second slider in the first direction by coming into contact with the second slider.

[0009] In one embodiment, the movement restricting means is a first movement restricting means that positions the second slider at a first position and restricts movement in a first direction from the first position to the second position, The second slider is provided with a second movement restricting means for restricting movement of the second slider in the second direction when the second slider is at the first position.

[0010] In one embodiment, the first movement restricting means is a screw that is movable in the movement direction of the slider unit, and the second movement restricting means is a spacer. In one embodiment, the second unit (constituting the second operating mechanism) is formed from the second slider, the third slider, the second spring, the slide shaft, and the second body incorporating these. In one embodiment, the screw is provided on one side wall of the second main body, and the tip of the shaft portion is capable of abutting against the second slider unit (second slider). In one embodiment, the spacer is provided between the second slider unit (third slider) and the other side wall of the second body. In one embodiment, the second movement restricting means (spacer) is removed after the brake return wire is connected. In one embodiment, the first movement restricting means (screw) is removed after the second unit is attached.

[0011] In one embodiment, the second slider is movable in conjunction with the movement of the first slider biased in a first direction by a first spring; In the event of a fire, the first slider is moved in a first direction from the first position to the second position by activation of the automatic closing device, During construction, the first slider is in a temporary fixed position with its movement in the first direction restricted by a third movement restricting means; The device includes a linking means for linking the first slider and the second slider, The first movement restricting means, the second movement restricting means, and the third movement restricting means are positioning means for aligning the interlocking means during construction.

[0012] In one embodiment, the third movement restricting means is a spacer. In one embodiment, the third movement restricting means (spacer) is automatically removed when the manual closing device is set. In one embodiment, the first unit (constituting the first operating mechanism) is formed from the first slider, the first spring, the slide shaft, the automatic closing device (including the retaining means), and the first body in which these are incorporated. In one embodiment, the third movement restricting means (spacer) is provided between the first slider and one side wall of the first body. In one aspect, the portion of the second slider positioned at the first position by the first movement regulating means and the portion of the first slider positioned at the temporary fixed position by the third movement regulating means are aligned by the alignment means. In one embodiment, when the first body of the first unit including the first slider and the second body of the second unit including the second slider are connected, the interlocking means is automatically aligned by the alignment means. In one embodiment, the first slider includes a protrusion, the second slider has an opening for receiving the protruding piece of the first slider, and the protruding piece is positioned within the opening; The interlocking means comprises the protrusion and the edge of the opening. [Effects of the Invention]

[0013] According to the present invention, in a closing device for a fire shutter, the brake is prevented from being released due to malfunction during installation. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a schematic front view of an electric shutter device equipped with a safety device. In the drawing, solid lines connecting elements represent electric wires, and dashed lines represent wires. [Figure 2] FIG. 1 is a front view of an entire electric shutter device (with the opening fully closed) equipped with a safety device. [Figure 3] FIG. 10 is a diagram showing a state in which a closing device is attached to an opening / closing machine. [Figure 4] The left figure is a front view of the operation box, and the right figure is a cross-sectional view taken along line AA in the left figure. [Figure 5] 5 is a cross-sectional view taken along the line BB in the left diagram of FIG. 4, showing a state in which the recovery lever has been rotated downward. [Figure 6] The upper figure is a plan view of the closing device, and the lower figure is a side view of the closing device. The lower figure shows the state in which the wire W1 is pulled due to obstacle detection. [Figure 7] FIG. 1 is a perspective view of a first unit of the closure device. [Figure 8] FIG. 2 is a diagram showing a main body of the first unit. [Figure 9] FIG. 10 is a diagram showing a first slider of the first unit. [Figure 10] FIG. 10 is a view showing a holding means of the first unit. [Figure 11] 1A and 1B are a plan view, a side view, and a perspective view of a second unit. [Figure 12] FIG. 2 is a diagram showing the main body of the second unit. [Figure 13] FIG. 10 is a diagram showing a second slider of the second unit. [Figure 14] FIG. 10 is a diagram showing a third slider of the second unit. [Figure 15]1A-1C are plan, side and cross-sectional views of a closure device in a steady state. [Figure 16] 16A and 16B are a plan view, a side view, and a cross-sectional view of the closing device in a state where the automatic closing mechanism is activated from the state of FIG. 15. [Figure 17] 17A and 17B are a plan view, a side view, and a cross-sectional view of the closing device in a state where the obstacle detection means is activated, following the state shown in FIG. 16. [Figure 18] 16A and 16B are a plan view, a side view, and a cross-sectional view of the closing device in a state where the manual closing mechanism is activated from the state of FIG. 15. [Figure 19] 19A and 19B are a plan view, a side view, and a cross-sectional view of the closing device in a state where the obstacle detection means is activated, following the state shown in FIG. 18. [Figure 20] The upper figure shows the closing device in a steady state, the middle figure shows the closing device after the automatic closing mechanism has been activated from the steady state, and the lower figure shows the closing device when an obstacle is detected after the automatic closing mechanism has been activated. [Figure 21] The upper figure shows the closing device (steady state) during power opening and closing, and the lower figure shows the closing device when an obstacle is detected during power descent. [Figure 22] The upper diagram shows the closing device in a steady state, the middle diagram shows the closing device after the automatic closing mechanism has been activated from the steady state, and the lower diagram shows the state after the emergency closing switch has been activated after the automatic closing device has been activated (the wire has loosened, the holding means has slid to the second side and is now engaged with the first slider). In the state shown in the lower diagram, the wire is pulled by the recovery lever to return it to a tensed state, and the automatic closing mechanism returns to the steady state shown in the upper diagram. [Figure 23] 1A and 1B are a plan view, a left side view, a right side view, a front view, and a bottom view of the first unit, and among the screws used to assemble the first unit, the screws used during construction are shown in black. [Figure 24] 1A and 1B are a plan view, a left side view, a right side view, and a front view of the second unit, and among the screws used to assemble the second unit, the screws used during construction are shown in black. [Figure 25]A plan view of the first unit and a partial view of the wire fixing portion, in which the screws used to assemble the first unit are shown in black as the screws used during construction, and in the plan view, the pressure plate used to attach the wire is in a first position, and in the partial view, the pressure plate used to attach the wire is in a second position. [Figure 26] A bottom view of the second unit and a partial view of the wire fixing part, in which the screws used to assemble the second unit are shown in black as the screws used during construction, and in the plan view, the pressure plate used to attach the wire is in a first position, and in the partial view, the pressure plate used to attach the wire is in a second position. [Figure 27] FIG. 1 is a perspective view of a first unit with a wire attached thereto, showing the state before the first unit is attached to a second unit (not shown). [Figure 28] 10 is a diagram illustrating the attachment of a first unit to a second unit attached to a door-opening machine. FIG. [Figure 29] The upper figure shows the slider unit of the second unit in a free state (it can slide left and right), the middle figure shows the slider unit positioned in the first position, and the lower figure shows the slider unit positioned in the first position with a wire attached. [Figure 30] The upper figure shows the process of releasing the first movement restricting means that restricts the movement of the slider unit of the second unit from the first position in the first direction and removing the means that restricts the movement of the slider unit from the first position in the second direction, and the lower figure shows the state in which the released first movement restricting means has been returned to its original position to restrict the movement of the slider unit from the first position in the first direction. [Figure 31] The upper figure shows the second unit with the slider unit in the first position, and the lower figure shows the first unit with the slider unit in the temporary fixing position. [Figure 32] The upper diagram shows the first unit with the slider unit in a temporary fixed position, and the lower diagram shows the slider unit moved from the temporary fixed position in the upper diagram to the first position. [Figure 33]10 is a diagram showing a spacer that serves as both the second movement restricting means and the third movement restricting means. FIG. [Figure 34] 10 is a flowchart showing a process of attaching a second unit to an opening / closing machine. [Figure 35] 10 is a flowchart showing a process of attaching a first unit to a second unit attached to an opening / closing machine. DETAILED DESCRIPTION OF THE INVENTION

[0015] [A] Overall structure of shutter with mechanical safety device The overall configuration of a shutter with a mechanical safety device according to this embodiment will be described. As shown in Figures 1 and 2, the shutter device includes a shutter curtain 1 that opens and closes an opening. The upper end of the shutter curtain 1 is connected to a winding shaft (not shown) located above the opening, and guide rails 2 are provided on both the left and right ends of the opening. The shutter curtain 1 is made up of multiple long slats that extend in the width direction of the opening and are connected vertically, and a seat plate 3 is provided at the lower end. When the opening is fully open, the shutter curtain 1 is wound up around the winding shaft. As the winding shaft rotates from this state, the shutter curtain 1 descends while being guided by the guide rails 2 at both the left and right ends in the width direction until the seat plate 3 at the lower end of the shutter curtain 1 touches the floor, fully closing the opening. The seat plate 3 consists of a long upper seat plate 30 extending in the width direction of the opening, and a long lower seat plate 31 suspended below the upper seat plate 30 so that it can move up and down relative to the upper seat plate 30.The seat plate 3 is one component of the obstacle detection means that detects an obstacle when the shutter curtain 1, which descends by its own weight or is electrically descended, hits an obstacle.

[0016] The winding shaft is power-coupled to the output shaft of the opening / closing device M, and when the opening is fully open, the rotation of the winding shaft is restricted by the brake of the opening / closing device M, thereby maintaining the opening fully open. As shown in FIG. 3 and other figures, a brake release lever ML protrudes from the brake case of the opening / closing device M. Moving the brake release lever ML in the brake release direction releases the brake that restricts the rotation of the output shaft of the opening / closing device M and the winding shaft. In a specific embodiment, the brake means has a brake plate that can be freely moved toward and away from the opening / closing device output shaft or a rotating member that rotates integrally with the output shaft. When the opening is fully open, the brake plate is pressed against a biasing means such as a spring, and the brake is applied to restrict the rotation of the winding shaft. In this state, by swinging the brake release lever against the spring, the brake plate is separated, releasing the brake, allowing the winding shaft to rotate and allowing the shutter curtain to descend under its own weight. Furthermore, when the brake release lever is released, the brake plate is pressed by the spring, which is the biasing means, and the brake and brake release lever are automatically returned to their original positions. In other words, the brake of the opening / closing device M is forcibly released by the movement of the brake release lever, and is returned to its original position by the biasing means when the force exerted by the brake release lever is released.

[0017] The shutter device is equipped with a closing device 5 for lowering the shutter curtain 1 under its own weight when the opening is fully open in the event of a fire. In Figures 1 and 2, the closing device 5 is attached adjacent to the lower side of the opening / closing device M, and in Figure 3, the closing device 5 is attached adjacent to the upper side of the opening / closing device M, but the attachment position and attachment posture of the closing device 5 can be selected appropriately depending on the attachment posture of the opening / closing device M and the type of the opening / closing device M.

[0018] The closing device 5 is activated based on the input of a fire detection signal, releasing the brake of the opening / closing mechanism M and causing the shutter curtain 1 to descend under its own weight to fully close the opening and form a fire compartment. If a fire occurs when the opening is fully open, the fire is detected by the fire detector 4a, and the automatic closing mechanism of the closing device 5 is activated by the passage of electricity based on the fire detection signal from the disaster prevention panel 4b, and in conjunction with the operation of the automatic closing mechanism, the brake of the opening / closing mechanism M is released, causing the shutter curtain 1 to descend under its own weight. The shutter device also has a manual closing mechanism or device that allows the shutter curtain 1 to be manually lowered under its own weight at any time, separate from the input of a fire detection signal.

[0019] The closing device 5 according to this embodiment is an integrated unit assembled from a first unit 6 and a second unit 7, and is attached adjacent to the opening / closing machine M so that the operating force is applied to the brake release lever ML without using a wire. The first unit 6 constitutes the automatic closing mechanism and part of the manual closing mechanism, and the second unit 7 constitutes a brake release / return mechanism that releases the brake release lever of the opening / closing machine in conjunction with the operation of the automatic closing mechanism or the manual closing mechanism. Details of the configuration and operation of the closing device 5 according to this embodiment will be described later.

[0020] The shutter device is equipped with a so-called safety device. When the seat plate 3 at the bottom of the shutter curtain 1 hits an obstacle during its own descent and detects the obstacle, the brake of the opening / closing device M is released via a brake release wire, stopping the shutter curtain 1 from descending under its own weight. The brake release wire is composed of wires W1 and W2. A relay device 8 is provided above the opening, near the side of the opening width where the opening / closing device M is installed. A locking device 9 is provided on the seat plate 3, near one side of the opening width, below the relay device 8. The locking device 9 includes a locking drum located approximately directly below the relay device 8, a winding drum adjacent to the locking drum, and a locking mechanism that locks the rotation of the locking drum when an obstacle is detected. One example of the obstacle detection means is a detection lever rotatably mounted between the upper seat plate 30 and the lower seat plate 31 of the seat plate 3. Wire W1 and wire W2 are connected via the relay device 8. One end of the wire W1 is connected to the brake release / return mechanism, and the other end is connected to the relay device 8. The wire W1 extends inside the outer wire W1'. One end of the wire W2 is connected to the relay device 8, and the other end is wound around a lock drum of a lock device 9 provided on the base plate 3 and connected to a take-up drum via the lock drum so that it can be wound around the take-up drum. The wire W2 is pulled out so as to extend along the surface of the shutter curtain 1 as the shutter curtain 1 descends. The lock device 9 is provided on the upper base plate 30, and when the lower base plate 31 of the shutter curtain 1 hits an obstacle during descending and moves upward relative to the upper base plate 30, the lock device 9 mechanically restricts the withdrawal of the brake return wire (wire W1 + wire W2), and when the brake return wire (wire W1 + wire W2) whose withdrawal has been restricted is pulled, the return mechanism of the brake release / return mechanism is activated.

[0021] In the case where the lower base plate 31 of the shutter curtain 1 hits an obstacle while it is descending under its own weight, the safety device pulls the brake return wire (wire W1 + wire W2), activating the brake return mechanism, releasing the brake and restricting the rotation of the winding shaft, mechanically stopping the shutter curtain 1 from descending under its own weight. When the obstacle is removed, the brake return wire (wire W1 + wire W2) can be pulled, activating the brake release mechanism of the brake release / return mechanism, causing the shutter curtain 1 to descend again under its own weight. In addition, after the obstacle is removed, the timing at which the shutter curtain 1 will descend again under its own weight is delayed. For detailed specific examples of the configurations of the relay device 8 and locking device 9, the configuration of the obstacle detection means, and the configuration of the means for delaying the re-descension under its own weight after the obstacle is removed, see, for example, Patent Document 1.

[0022] As shown in FIGS. 1 and 2, an operation box 10 is provided on a wall near the shutter device at a height that allows for easy operation. As shown in FIG. 4, the operation box 10 is a vertically elongated rectangular box with an openable and closable lid 100 provided on the front and a cylinder lock that keeps the lid 100 closed. The lid 100 has a keyhole 1000 into which a key for locking and unlocking the cylinder lock is inserted. The operation box 10 functions as a switch box, and is internally provided with an open / close operation switch 101 consisting of an open switch U, a close switch D, and a stop switch S. As shown in FIG. 1, the open / close operation switch 101 is electrically connected to the control unit (obstacle detection control panel 11A, shutter control panel 11B). In the case of a manual shutter device, the operation box 10 does not necessarily have to be provided with an open / close operation function (open / close operation switch 101).

[0023] The operation box 10 according to this embodiment has an opening / closing operation function using an opening / closing operation switch 101, a manual closing function using an emergency closing switch 102, an automatic closing mechanism using a recovery lever 103, and a recovery function for the manual closing mechanism. One end of a wire W3, which is a component of the manual closing mechanism, is connected to the first unit 6 of the closing device 5, and the other end of the wire W3 extends into the operation box 10 and is fixed in a tensioned state by a fixing means or a locking means. A pressing portion 102' of the emergency operation switch 102 is displayed on the cover 100 of the operation box 10. With the cover 100 closed, pressing the pressing portion 102' activates the emergency operation switch 102, releases the fixing means or locking means of the wire W3, and releases the tensioned state, loosening the wire W3. The manual closing mechanism is activated in conjunction with loosening the wire W3.

[0024] As shown in Figures 4 and 5, a recovery lever 103 is provided adjacent to the cover 100 on the front of the operation box 10. The recovery lever 103 is normally stored flush with the front of the operation box 10 and changes from a stored position to a protruding position (indicated by 103') in response to pressing the emergency operation switch 102. By rotating the recovery lever 103' from the protruding position downward (indicated by 103"), the loosened wire W3 is pulled and placed in a taut state, and the other end of the wire W3 is locked, maintaining the taut state of the wire W3. The recovery lever 103 is then returned to the stored position and set to its initial position. The emergency closing switch 102 and recovery lever 103 of the operation box 10 constitute a manual operation unit, and a first operation (manual closing operation) is performed by pressing the emergency closing switch 102, and a second operation (recovery operation) is performed by rotating the recovery lever 103. Details of the manual closing function, the automatic closing mechanism, and the recovery function of the manual closing mechanism will be described later.

[0025] The shutter with a mechanical harm prevention device according to this embodiment can be used as a so-called controlled combined shutter, or as a fire shutter that is normally left open but in the event of a fire, the shutter curtain 1 descends under its own weight to form a fire compartment. In the case of a controlled combined shutter, under normal circumstances, the shutter curtain 1 is electrically raised and lowered by operating the opening / closing operation switch 101 on the operation box 10 to rotate the winding shaft forward and backward by the opening / closing device M, thereby opening and closing the opening, and in the event of a fire, the shutter curtain 1 descends under its own weight, operating as a fire shutter. When used as a controlled combined shutter, the control unit of the shutter device according to this embodiment is designed to execute different controls in the electric opening / closing mode (normal mode) and the gravity descent mode (fire mode).

[0026] The control unit according to this embodiment includes an obstacle detection control panel 11A and a shutter control panel 11B. As shown in FIG. 1 , the closing device 5 and the obstacle detection control panel 11A are electrically connected, the obstacle detection control panel 11A and the shutter control panel 11B are electrically connected, and the open / close operation switch 101 in the operation box 10 is electrically connected to the obstacle detection control panel 11A. During electric lifting, an open signal, a close signal, or a stop signal based on input from the open / close operation switch 101 is transmitted to the shutter control panel 11B via the obstacle detection control panel 11A. In the illustrated embodiment, the obstacle detection control panel 11A and the shutter control panel 11B are physically separated, but the control unit may be a single control unit having the functions of both the obstacle detection control panel 11A and the shutter control panel 11B.

[0027] In the controlled combined shutter according to this embodiment, even if the seat plate 3 at the bottom end of the shutter curtain 1 hits an obstacle during electric descent, the movement of the movable part (third slider 71) of the brake release / return mechanism via the brake return wire (wire W1 + wire W2) is detected, and the electric descent of the shutter curtain 1 is stopped. In other words, regardless of whether the descent is electric or gravity descent, the descent of the shutter curtain 1 is stopped via the brake release / return mechanism when the shutter curtain 1 hits an obstacle during closing. More specifically, in the case of electric descent, the opening / closing device M is stopped by the operation of the second microswitch SW2 (see FIG. 21) which detects the movement of the movable part (third slider 71), and in the case of gravity descent, the shutter curtain 1 is stopped during descent by the mechanical return of the brake release lever ML accompanying the movement of the movable part (third slider 71).

[0028] [B] Closing device As shown in Figures 3, 6, etc., the closing device 5 according to this embodiment is configured by assembling a first unit 6 and a second unit 7. The first unit 6 constitutes the automatic closing mechanism and the manual closing mechanism, and the second unit 7 constitutes a brake release / return mechanism that releases the brake lever ML of the opening / closing device M in conjunction with the operation of the automatic closing mechanism or the manual closing mechanism, and returns the brake lever ML when an obstacle is detected. The configuration of the closing device 5 will be described in detail below.

[0029] [B-1] Unit 1 The first unit 6 includes a first slider 60 that is slidable between a first position and a second position, a first coil spring 61 that urges the first slider 60 from the first position toward the second position, and an automatic closing mechanism that slides the first slider 60 from the first position to the second position in response to an input of a fire detection signal. In the description of the first unit 6, the side closer to the first position is referred to as the first side, and the side closer to the second position is referred to as the second side. It should be noted that the term "rising piece" used to name a portion of a component can refer to, for example, a piece that extends downward or a piece that extends horizontally, depending on the position of the component.

[0030] The automatic closing mechanism includes a holding means 62 that engages with the first slider 60 in the first position to hold the first slider 60 in the first position, and a solenoid 63 that is activated by energization based on the input of a fire detection signal from the disaster prevention panel 4b to release the engagement between the first slider 60 in the first position and the holding means 62. The holding means 62 is made up of a base 620 that can slide between the first position and the second position, and a latch or locking portion 621 that is rotatably provided at the tip of the base, and the locking portion 621 can be engaged with the first slider 60.

[0031] The solenoid 63 has a shaft (plunger) 630 extending in the sliding direction of the first slider 60, and a connecting piece 625 is attached to the tip of the shaft 630, which is connected to a locking portion 621 of the holding means 62 via the connecting piece 625. The shaft 630 is a movable shaft, and when current is instantly applied to the solenoid 63 based on the input of a fire detection signal from the disaster prevention panel 4b, the shaft 630 is pulled toward the first side, causing the locking portion 621 to rotate in a direction that releases the locking state, thereby releasing the locking state between the first slider 60 and the locking portion 621 of the holding means 62. When not energized, the shaft 630 of the solenoid 63 can be pulled toward the second side.

[0032] The first unit 6 is provided with a detection means (microswitch SW) that detects that the automatic closing mechanism has been activated. When the microswitch SW detects that the automatic closing mechanism has been activated and the first slider 60 has moved from the first position to the second position, a detection signal is sent to the disaster prevention panel 4b, and in response to the detection by the microswitch SW, the power supply to the solenoid 63 is cut off based on the fire detection signal from the disaster prevention panel 4b.

[0033] The first unit 6 has a main body or frame 64 including a plate-shaped bottom wall 640 and a first side wall 641 and a second side wall 642 rising from a first side and a second side of the bottom wall in an opposing relationship. A pair of slide shafts 65 are provided parallel to each other so as to bridge between the first side wall 641 and the second side wall 642. The first slider 60 is slidable along the slide shafts 65 between a first position and a second position, and a first coil spring 61 is attached to the slide shafts 65. An L-shaped member is fixed to the bottom wall 640 of the main body 64 at a position close to the first side, and a contact rising piece 643 is provided from the rising portion of the member, and the slide shaft 65 is inserted into the contact rising piece 643.

[0034] 8 shows a parts diagram of the main body 64 of the first unit 6. An opening 6400 is formed in a portion of the bottom wall 640 closer to the second side, and an opening 6401 is formed in a portion closer to the first side. In the bottom wall 640, between the openings 6400 and 6401, holes 6402 and 6403 are formed to receive the heads of screws 623 and 624 (see FIG. 10) for attaching a guide plate 622, which will be described later. An opening 6420 is formed adjacent to the bottom wall 640 on the base end side of the second side wall 642.

[0035] 9, the first slider 60 has a generally U-shaped configuration in side view, and includes a plate-like surface portion 600 extending parallel to a bottom wall 640 of the main body 64, and a first rising piece 601 and a second rising piece 602 rising vertically and facing each other from a first side and a second side of the surface portion 600. Holes 6010 and 6020 are formed in the first rising piece 601 and the second rising piece 602, through which the slide shaft 65 is inserted. In the first slider 60 according to this embodiment, the rising pieces 601 and 602 are a pair of rising pieces 601, 601; 602, 602, respectively, rising from both sides in the width direction of the surface portion 600. An opening 6000 is formed in the approximate center of the surface portion 600, and a locking hole 6001 for the coil spring 67 is formed on the first side of the opening 6000.

[0036] As described above, the bottom wall 640 of the main body 64 is provided with the abutment raised piece 643 at a position close to the first side, and the first coil spring 61 mounted on the slide shaft 65 has its first-side end abutting against the abutment raised piece 643 and its second-side end abutting against the second raised piece 602 of the first slider 60. When the first slider 60 is in the first position, the distance between the second raised piece 602 of the first slider 60 and the abutment raised piece 643 is smaller (compared to when the first slider 60 is in the second position), and the first coil spring 61 is in a compressed state. This is clear, for example, by comparing the length of the first coil spring 61 in FIG. 15 with the length of the second coil spring 61 in FIG. 16. The first coil spring 61 is an operating spring common to both the automatic closing mechanism and the manual closing mechanism.

[0037] A protrusion 603 is provided on the outer surface of the second side of the face portion 600 of the first slider 60 as an element of an interlocking means or transmission means for transmitting the sliding movement of the first slider 60 to the second slider 70. In this embodiment, the protrusion 603 is part of an arm that is L-shaped in side view, and the arm is made up of a base 604, the protrusion 603 standing up from the base 604, and a tongue-shaped protrusion 605 at the tip of the base 604. The arm is integrated with the first slider 60 by fixing the base 604 to the outer surface of the face portion 600 of the first slider 60 with screws (or welding). The protrusion 603 is inserted through an opening 6400 formed in a bottom wall 640 of the main body 64, and the protrusion 603 moves within the opening 6400 when the first slider 60 slides between the first position and the second position.

[0038] When the first slider 60 moves to the second position, the protrusion 605 protrudes from an opening 6420 formed in the second side wall 642 of the main body 64 (see FIG. 16 ). The closing device 5 according to this embodiment is configured by assembling the first unit 6 and the second unit 7, and the first unit 6 can also be used independently. Therefore, by selectively using the displacement of the protrusion 603 (which can reciprocate in a direction perpendicular to the protrusion direction of the protrusion 603) and the displacement of the protrusion 605 (which can reciprocate along the protrusion direction of the protrusion 605) when the first slider 60 slides, the first unit 6 can be used alone as a closing device for a shutter to be installed in an opening that does not require a safety mechanism. More specifically, the first unit 6 can be attached alone to the opening / closing mechanism of a closing device that does not have a safety mechanism in an attitude and position where one of the protrusions 603 and 605 can be selected to press the brake release lever in the brake release direction, and when the automatic closing mechanism or the manual closing mechanism is activated, the selected protrusion presses the brake release lever in the brake release direction, releasing the brake and allowing the shutter curtain to descend under its own weight.

[0039] 9, a locked portion 606, which is locked by a locking portion 621 of the holding means 62, protrudes from the inner surface of the second side of the face portion 600 of the first slider 60, adjacent to the edge of the second side of an opening 6000 formed in the face portion 600. The locked portion 606 according to this embodiment has a U-shape consisting of a pair of side pieces 6060 and a bottom piece 6061, and is fixed to the face portion 600 with the bottom piece 6061 standing upright from the face portion 600.

[0040] The holding means 62 has a rotatable locking portion 621 that locks with the locked portion 606 of the first slider 60, and is slidable between a first position and a second position. The holding means 62 has a first biasing means (coil spring 66) that biases the locking portion 621 in a direction in which it locks with the locked portion 606 of the first slider 60, and a second biasing means (coil spring 67) that biases the holding means 62 with a force that moves it from the first position to the second position in response to the first slider 60 moving from the first position to the second position when the automatic closing mechanism is activated.

[0041] The base 620 of the holding means 62 is located between the surface portion 600 of the first slider 60 and the bottom wall 640 of the main body 64. As shown in Fig. 10, the base 620 of the holding means 62 includes a rectangular bottom surface 6200 extending in the movement direction and side pieces 6201 at both ends in the width direction of the bottom surface 6200, a rising piece 6202 on the tip side (second side) of the side piece 6201 serves as a support portion for the shaft portion 6212 of the locking portion 621, and a wide extending surface 6200' is integrally formed on the base end side (first side) of the bottom surface 6200 beyond the base end of the side piece 6201, and a rising piece 6203 is formed from the base end of the extending surface 6200'.

[0042] The bottom surface 6200 is formed with two elongated holes 6204, 6205 extending in the length direction (movement direction). A rectangular guide plate 622 extending in the movement direction is located on the upper surface of the bottom surface 6200, and the guide plate 622 is connected to a bottom wall 640 (not shown in FIG. 10 ) of the main body 64 at two points in the length direction using two screws 623, 624. The shanks of the screws 623, 624 are inserted into the elongated holes 6204, 6205, respectively, and the base 620 of the holding means 62 is located between the bottom wall 640 and the guide plate 622 and is slidable between a first position and a second position while being guided by the guide plate 622. An opening 6206 is formed in the bottom surface 6200 at a first side of the elongated hole 6205, and one end of the wire W3 is fixed to the edge of the opening 6206 on the first side.

[0043] The locking portion 621 of the holding means 62 includes a pair of side pieces 6210 having a generally triangular shape in a side view and having a first corner, a second corner, and a third corner, and a pair of locking rollers 6211 are provided on a shaft provided between the first corners of the side pieces 6210, and is rotatably connected to a rising piece 6202 at the tip of the base 620, with a shaft 6212 provided between the second corners of the side pieces 6210 as a rotation fulcrum. A connecting piece 625 is connected to a shaft 6213 provided between the third corners of the side pieces 6210, and the tip of a shaft 630 of the solenoid 63 is connected to the connecting piece 625. The holding means 62 has a base 620 positioned between the surface 600 of the first slider 60 and the bottom wall 640 of the main body 64, and a locking means 621 positioned in the opening 6000 of the surface 600 of the first slider 60, and positioned above (in the illustrated position) the locked portion 606 fixed to the surface 600. In the locked position, the first corner of the side piece 6210 of the locking portion 621 is positioned on the second side of the second corner, and the first corner and the second corner are positioned at approximately the same height relative to the surface 600 (the side connecting the first corner and the second corner is approximately parallel to the surface 600), and the third corner is positioned further away from the surface 600 (higher in the illustrated position), and the first corner is positioned on the second side of the third corner, and the third corner is positioned slightly on the second side of the second corner. The locking portion 621 rotates in a direction that releases the locked state when the third corner portion moves to the first side (right side in the figure), and is biased so that the locked position is maintained by biasing the third corner portion toward the second side (left side in the figure).

[0044] 10 , connecting piece 625 is made up of a first portion to which shaft portion 6213 is attached and a second portion located on a first side of the first portion and extending in the height direction, and connecting piece 625 is formed with a first hole 6250 on the side closer to shaft portion 6213 and a second hole 6251 on the side farther from shaft portion 6213. A line connecting the center of shaft portion 6213 (attachment hole of shaft portion 6213) and the center of first hole 6250 forms a right angle with a line connecting the center of first hole 6250 and the center of second hole 6251. Connecting piece 625 is attached in an orientation in which shaft portion 6213 and first hole 6250 are positioned at approximately the same height relative to surface portion 600.

[0045] The tip of the shaft 630 of the solenoid 63 is connected to the connecting piece 625 by a pin that passes through a first hole 6250 of the connecting piece 625. The first hole 6250 is located at approximately the same height as the third corner of the side piece 6210 (with respect to the rotation fulcrum of the locking portion 621), and when the shaft 630 is pulled toward the first side by energizing the solenoid 63, the third corner of the locking portion 621 is pulled toward the first side via the connecting piece 625, and the locking portion 621 rotates in a direction in which the locking roller 6211 located at the first corner moves away from the locked portion 606 of the first slide 60, and the locked state between the holding means 62 and the first slider 60 is released.

[0046] One end of a coil spring 66 is connected to the second hole 6251 of the connecting piece 625 of the holding means 62, and the other end of the coil spring 66 is connected to a locking hole 6421 in the second side wall 642 of the main body 64. The coil spring 66 according to this embodiment extends in the sliding direction of the first slider 60 and the holding means 62 (parallel to the first coil spring 61 and the slide shaft 65). The coil spring 66 functions as a first biasing means that biases the locking portion 621 in the locking direction (the direction in which the locking roller 6211 moves downward with the shaft portion 6212 as the pivot point) to maintain the attitude in which the locking portion 621 is locked to the locked portion 606 of the first slider 60. The second hole 6251 of the connecting piece 625 to which one end of the coil spring 66 is connected is located away from the shaft portion 6212, which is the pivot point of the locking portion 621, and the coil spring 66 urges the locking portion 621 in a direction pulling it toward the second side via the connecting piece 625, thereby urging the locking roller 6211 of the locking portion 621 to press downward, and the locking roller 6211 of the locking portion 621 is maintained in an engaged position with the locked portion 606 of the first slider 60.

[0047] When current is momentarily applied, solenoid 63 is activated, causing locking portion 621 to rotate in the direction of releasing the locked state against the biasing force of coil spring 66 (after current is cut off), and then coil spring 66 causes locking portion 621 to rotate so as to return to the locked position. Note that in this embodiment, locking roller 6211 of locking portion 621, which rotates to return to the locked position, comes into contact with locked portion 606 so as to rest on it, and locked portion 606 does not completely return to the locked position after the automatic closing mechanism is activated (see FIG. 16).

[0048] The first biasing means may be a torsion spring provided at the base end of the rotation of the locking portion 621 so as to bias the locking portion 621 in the locking direction, but the coil spring 66 according to this embodiment is advantageous in that it has the effect of stabilizing the locking position of the locking portion 621 during the sliding movement of the holding means 62. This will be explained in the section on restoring the activated closure device 5.

[0049] In this embodiment, the locking roller 6211 of the locking portion 621 of the holding means 62 is locked to the locked portion 606 by point contact, thereby reducing contact resistance in the locked state. In an emergency such as a fire, in order to more reliably release the brake of the opening / closing device M and allow the shutter curtain 1 to descend under its own weight to form a fire compartment, it is desirable to press the brake release lever with a greater operating force, and this operating force can be increased by increasing the spring force for operating the closing device (in this embodiment, the spring force of the first coil spring 61). At this time, the contact resistance acting on the engaging portion, i.e., the latch portion, also increases (the automatic closing mechanism will not operate unless the latch is released), but in this embodiment, the engaging roller 6211 engages with the side piece 6060 of the engaged portion 606 by point contact, thereby reducing the contact resistance in the engaged state, and in cooperation with the fact that the engaging roller 6211 is free to rotate, this increases the spring force of the first coil spring 61, but in the event of a fire the engaged state is released smoothly, allowing the automatic closing mechanism to exert a greater operating force.

[0050] A rising piece 6203 is formed at a base end portion (first side end portion) of the base 620 of the holding means 62, and a coil spring 67 serving as a second biasing means is provided between the rising piece 6203 and the locking hole 6001 formed in the first side portion of the face portion 600 of the first slider 60. In this embodiment, in the first unit 6, the face portion 600 of the first slider 60 and the upper portion of the rising piece 6203 of the holding means 62 are at approximately the same height position, and the coil spring 67 extends in the sliding direction of the first slider 60 and the holding means 62 and is adapted to expand and contract in the sliding direction.

[0051] The coil spring 67 is a tension spring, and as the first slider 60 moves from the first position to the second position relative to the holding means 62 (which maintains the first position), the coil spring 67 is pulled, and the force acting to return to its original length is stored as a biasing force that moves the holding means 62 from the first position to the second position. In other words, when the automatic closing mechanism is activated and the locked state between the holding means 62 and the first slider 60, which are maintained at the first position, is released, the first slider 60 slides from the first position to the second position relative to the holding means 62, which maintains the first position, and at this time, a biasing force that moves the holding means 62 from the first position to the second position is stored by the coil spring 67, which functions as the second biasing means.

[0052] When the automatic closing mechanism is activated, the solenoid 63 is energized, releasing the locked state between the holding means 62 and the first slider 60, and only the first slider 60 slides from the first position to the second position due to the biasing force of the first coil spring 61, while the wire W3 is in a tensioned state, maintaining the holding means 62 at the first position. At this time, a biasing force that moves the holding means 62 from the first position to the second position is stored in the pulling coil spring 67.

[0053] One end of a wire W3 constituting a manual closing mechanism that manually moves the first slider 60 from the first position to the second position is connected to a proximal end portion of the base 620 of the holding means 62 (the edge portion on the first side of the opening 6206). A manual operation unit (emergency closing switch 102) is provided on the other end of the wire W3. The wire W3 extends inside the outer wire W3'. The wire W3 is maintained in a tensioned state when the first slider 60 in the first position and the holding means 62 are engaged (i.e., when the holding means 62 is in the first position). When the wire W3 is in a tensioned state, the holding means 62 is maintained in the first position. The tensioned state of the wire W3 is maintained by pulling the other end on the operation box 10 side to tension the wire W3 and fixing the other end of the tensioned wire W3.

[0054] The manual closing mechanism is configured such that, when the first slider 60 is engaged with the holding means 62, the fixing means at the other end of the wire W3, which is in a tensioned state, is released by a first operation of the manual operating unit (i.e., pressing the emergency closing switch 102 on the operation box 10), thereby loosening the wire W3, and the force of the first coil spring 61 moves the first slider 60 and holding means 62, which are in the first position, to the second position while maintaining the engaged state.

[0055] [B-2] Second Unit 11 , the second unit 7 includes a second slider 70 that is slidable between a first position and a second position in conjunction with the sliding movement of the first slider 60, a third slider 71 that is slidable between the first position and the second position, sliding integrally with the second slider 70 from the first position to the second position, and sliding independently from the second slider 70 from the second position to the first position, and a second coil spring 72 provided between the second slider 70 and the second slider 71. When the second slider 70 moves from the first position to the second position, the third slider 71 slides integrally with the second slider 70 via the second coil spring 72 to release the brake of the opening and closing device, and by compressing the second coil spring 72, the third slider 71 can move to the first position independently of the second slider 70 to release the brake of the opening and closing device. In the description of the second unit 7, the side closer to the first position is referred to as the first side, and the side closer to the second position is referred to as the second side. Also, please note that the term "rising piece" used as the name of a part of a member can be, for example, a piece extending downward or a piece extending horizontally, depending on the position of the member.

[0056] One end of the wire W1 of the brake return wire (wire W1+wire W2) is connected to the third slider 71, and the other end of the wire W1 is connected to the relay device 8 of the mechanical safety device. When an obstacle is detected during gravity descent, the brake return wire (wire W1+wire W2) is pulled, causing the third slider 71, which is in the second position, to slide toward the first side toward the first position independently of the second slider 70 while compressing the second coil spring 72, thereby releasing the brake. When an obstacle is detected, the third slider 71 is movable beyond the normal position (first position) toward the first side. That is, the third slider 71 takes three positions: the normal position or the first position (brake return position), the second position (brake release position) moved from the normal position toward the second side, and the third position (obstacle detection position) moved from the normal position toward the first side.

[0057] The second unit 7 has a main body or frame 73 including a plate-shaped bottom wall 730 and a first side wall 731 and a second side wall 732 rising up oppositely from a first side and a second side of the bottom wall 730. A pair of second slide shafts 74 are provided in parallel to each other so as to bridge between the first side wall 731 and the second side wall 732. The second slider 70 and the third slider 71 are slidable along the second slide shafts 74 between a first position and a second position, and a second coil spring 72 is fitted around the slide shafts 74.

[0058] A component diagram of the main body 73 of the second unit 7 is shown in Fig. 12. In the main body 73 according to this embodiment, an opening 7300 is formed from the center of the bottom wall 730 to the second side. Left and right bent pieces 7310 are formed on both sides of the first side wall 731 in the width direction, and one end of the outer wire W1' is inserted and fixed between a pair of central bent pieces 7311 formed between the left and right bent pieces 7310. Left and right bent pieces 7320 are formed on both sides of the second side wall 732 in the width direction.

[0059] As shown in Figure 13, the second slider 70 has a roughly U-shaped configuration in side view, consisting of a plate-like surface portion 700 extending parallel to the bottom wall 730 of the main body 73, and a first raised piece 701 and a second raised piece 702 rising vertically and oppositely from a first side and a second side of the surface portion 700, and holes 7010 and 7020 are formed in the first raised piece 701 and the second raised piece 702, through which the slide shaft 74 is inserted.

[0060] In this embodiment, the surface portion 700 of the second slider 70 is located closer to the first unit 6, and an opening 703 is formed in the surface portion 700 to receive the protruding piece 603 of the first slider 60. When the protruding piece 603 of the first slider 60 abuts the edge of the opening 703, the sliding movement of the first slider 60 is transmitted to the second slider 70, and the second slider 70 slides from the first position to the second position in conjunction with the sliding movement of the first slider 60 from the first position to the second position. In this embodiment, the second end of the surface portion 700 is a protruding portion that protrudes further toward the second side than the second rising piece 702, and an opening 703 is formed at the base end of the protruding portion. In addition, an opening 7000 is formed in the surface portion 700 from the central portion to the base end portion of the first rising piece 701, and the base end portion of the first rising piece 701 has a concave edge.

[0061] As shown in FIG. 14 , the third slider 71 has a generally U-shaped configuration in side view, consisting of a plate-like surface portion 710 extending parallel to the bottom wall 730 of the main body 73, and first and second rising pieces 711 and 712 rising vertically from a first side and a second side of the surface portion in opposing directions. Holes 7110 and 7120 are formed in the first and second rising pieces 711 and 712, respectively, through which the slide shaft 74 is inserted. The edge on the second side of the surface portion 710 is concave, and a compression piece 713 that protrudes in a curved shape relative to the surface portion 710 is integrally formed at the center in the width direction. The compression piece 713 of the third slider 71 is located within an opening 7300 in the bottom wall 730 of the main body 73 of the second unit 7. A pair of bent pieces 714 is formed at the center in the width direction of the first rising piece 711, and a wire W1 is inserted between the bent pieces 714 to secure the first rising piece 711 in place.

[0062] In this embodiment, the surface 710 of the third slider 71 is located on the side closer to the case of the opening / closing device M, and the tip of the brake release lever ML of the opening / closing device M extends into the second unit 7 through an opening 7300 in the bottom wall 730 of the main body 73. When the closing device is activated, the third slider 71 slides from the first position to the second position, causing a compression piece 713 protruding from the surface 710 to compress the brake release lever ML in the brake release direction, thereby releasing the brake.

[0063] As shown in FIG. 11 , the second slider 70 and the third slider 71 have their surfaces 700, 710 facing each other with a gap therebetween, and the second raised piece 702 of the second slider 70 is positioned closer to the second side wall 732 than the second raised piece 712 of the third slider 71, and the second raised piece 712 of the third slider 71 abuts against the inside of the second raised piece 702 of the second slider 70, and the first raised piece 711 of the third slider 71 is positioned closer to the second side wall 732 than the second raised piece 701 of the second slider 70. The third slider 71 is positioned closer to the first side wall 731, and is assembled to the second slide shaft 74 with the first raised piece 701 of the second slider 70 abutting against the inside of the first raised piece 711 of the third slider 71. The first side end of the second coil spring 72 mounted on the second slide shaft 74 abuts against the inside of the first raised piece 701 of the second slider 70, and the second side end abuts against the inside of the second raised piece 712 of the third slider 71.

[0064] In conjunction with the first slider 60 sliding from the first position to the second position, when the second slider 70 slides from the first position to the second position, the first rising piece 701 of the second slider 70 presses the first side end of the second coil spring 72 toward the second side, and the second rising piece 712 of the third slider 71 is pressed toward the second side by the first side end of the second coil spring 72, so that the second slider 70, the second coil spring 72, and the third slider 71 slide together to the second position, and the compression piece 713 of the third slider 71 presses the brake release lever ML to release the brake, causing the shutter curtain 1 to descend under its own weight.

[0065] When the shutter curtain 1, which is descending under its own weight, hits an obstacle and the obstacle is detected, the brake return wire (wire W1 + wire W2) is pulled, and the third slider 71 connected to one end of the wire W1 is pulled to the first side from the second position toward the first position, and the third slider 71 slides toward the first side toward the first position independently of the second slider 70 (which maintains the second position) while the second rising piece 712 of the third slider 71 compresses the second coil spring 72 (at this time, a spring force toward the second side is stored in the third slider 71), and the pressure on the brake release lever ML by the pressure piece 713 of the third slider 71 is released, the brake is returned, and the shutter curtain 1, which is descending under its own weight, stops.

[0066] After the shutter curtain 1 stops descending due to the detection of an obstacle, when the obstacle is removed, the tension in the brake return wire (wire W1 + wire W2) is released, the brake return wire (wire W1 + wire W2) loosens, and the third slider 71 slides to the second side toward the second position due to the force of the compressed second coil spring 72, and the compression piece 713 of the third slider 71 presses the brake release lever ML to release the brake again, causing the shutter curtain 1 to descend again under its own weight.

[0067] As shown in FIG. 21 , the first unit 7 is provided with a first microswitch SW1 and a second microswitch SW2. The first microswitch SW1 is a means for detecting activation of the automatic closing mechanism or the manual closing mechanism. In this embodiment, the first microswitch SW1 is located in the path of the second slider 70 of the second unit 7 and is provided in a fixed portion (a predetermined portion of the main body 73) of the second unit 7 so as to detect when the second slider 70 of the second unit 7 moves from the first position to the second position in response to activation of the automatic closing mechanism or the manual closing mechanism. Detection by the first microswitch SW1 makes it possible to distinguish between the power-operated opening / closing mode and the gravity-lowering mode. When the second slider 70 slides from the first position to the second position in response to activation of the automatic closing mechanism or the manual closing mechanism, the power-operated opening / closing mode is activated and the gravity-lowering mode is entered, prohibiting power operation. In one embodiment, the first microswitch SW1 has an ON contact during monitoring and an OFF contact during activation. When the first microswitch SW1 changes from ON to OFF, an operation confirmation signal is input to the obstacle detection control panel 11A, and if the shutter curtain 1 is being electrically opened or closed, the operation of the opening / closing mechanism M is stopped via the shutter control panel 11B, and the pressing operation of the opening / closing operation switch 101 is invalidated, and gravity descent begins immediately. That is, when the first microswitch SW1 is ON, the system is in the electric opening / closing mode, and when the first microswitch SW1 is OFF, the system is in gravity descent mode. In this embodiment, the first microswitch SW1 operates when it changes from ON to OFF, but it will be understood by those skilled in the art that it can also be designed to operate when it changes from OFF to ON.

[0068] The second microswitch SW2 is a detection means for detecting an obstacle during the electrically driven descent of the shutter curtain 1. In this embodiment, the second microswitch SW2 is provided at a fixed portion of the second unit 7 (a predetermined portion of the main body 73) at a predetermined position on the path of the third slider 71 so as to detect when the third slider 71, which is in its normal position, moves to the first side. The second microswitch SW2 is activated when an obstacle is detected. In one embodiment, the contact is OFF during monitoring (normal shutter opening and closing), and the contact is ON when the microswitch is activated. In other words, an obstacle is detected when the second microswitch SW2 changes from OFF to ON during the electrically driven descent of the shutter curtain 1. When the second microswitch SW2 changes from OFF to ON during the electrically driven descent of the shutter curtain 1, an obstacle detection signal is input to the obstacle detection control panel 11A, which stops the electrically driven descent of the opening / closing mechanism M via the shutter control panel 11B. In this embodiment, the first microswitch SW1 is activated by being turned from OFF to ON, but it will be understood by those skilled in the art that the first microswitch SW1 may be designed to be activated by being turned from ON to OFF.

[0069] [B-3] Assembly of the closing device The closing device 5 is constructed by assembling a first unit 6 and a second unit 7 so that they overlap in a direction perpendicular to the sliding direction of the first slider 60, the second slider 70, and the third slider 71. As shown in FIG. 3, the first unit 6 and the second unit 7 are assembled so that they overlap in the protruding direction of the brake release lever ML of the opening / closing device M. The main body 64 of the first unit 6 incorporates the first slider 60, the first coil spring 61, the retaining means 62, the solenoid 63, the slide shaft 65, and the microswitch SW. The main body 73 of the second unit 7 incorporates the second slider 70, the third slider 71, the second coil spring 72, the slide shaft 64, the first microswitch SW1, and the second microswitch SW2. The first unit 6 and the second unit 7 are assembled by connecting the box-shaped main body 64 and the box-shaped main body 73 so that they overlap.

[0070] An attachment piece 68 having an L shape in side view is fixed to the outer surface of the first side wall 641 of the main body 64 of the first unit 6 from a first portion 680 and a second portion 681 via the second portion 681, and the first portion 680 extends so as to be flush with the bottom wall 640. The first unit 6 and the second unit 7 are assembled by overlapping and abutting the bent piece 7310 of the first side wall 731 of the main body 73 against the second portion 680 of the attachment piece 68 and connecting them with screws, and by overlapping and abutting the bent piece 7320 of the first side wall 732 of the main body 73 against the second side portion of the bottom wall 640 of the main body 64 and connecting them with screws (see FIG. 15 ). When the first unit 6 and the second unit 7 are assembled, the side surfaces and the top surface of the first unit 6 (in the position shown in the lower diagram of FIG. 6 ) are open. A cover (not shown) having a U-shape in cross section may be attached to cover the open areas on three sides of the stacked box-shaped first unit 6 and second unit 7.

[0071] In the closing device 5 assembled from the first unit 6 and the second unit 7, in the first unit 6, the face portion 600 of the first slider 60 faces the bottom wall 640 on the side closer to the bottom wall 640 of the main body 64, and in the second unit 7, the face portion 700 of the second slider 70 faces the bottom wall 640 on the side farther from the bottom wall 730 of the main body 73 (the side closer to the bottom wall 640), and the protruding piece 603 of the first slider 60 protrudes into the main body 73 of the second unit 7 from an opening 6400 in the bottom wall 640, and the protruding piece 603 is further inserted into the opening 703 of the face portion 700 of the second slider 70 of the second unit 7. The first slider 60 and the second slider 70 are slidable integrally from the first position to the second position and from the second position to the first position. The first coil spring 61 is a compression spring and has a first restoring force from a compressed state (when the first slider 60 is in the first position, i.e., a steady state) and a first compressive force for starting compression when the closing mechanism of the closing device 5 is activated, i.e., from the length when the first slider 60 is in the second position (in this embodiment, a state slightly compressed from the normal length), and the first compressive force is smaller than the first restoring force. The second coil spring 72 is a compression spring and has a second restoring force from a compressed state (a state when the third slider 71 has moved to the first side when an obstacle is detected) and a second compressive force for starting compression when the second coil spring 72 has moved integrally with the second slider 70 and the third slider 71 to the second position, i.e., from the normal length, and the second compressive force is smaller than the second restoring force, and the first compressive force is larger than the second restoring force. The second coil spring 72 compresses when a predetermined first force is applied, and its length remains unchanged when a predetermined second force smaller than the first force is applied. When the closing mechanism of the closing device 5 is activated, a force acts on the second coil spring 72 when the second slider 70 slides in conjunction with the sliding movement of the first slider 60. However, since the force at that time is the second force, the second coil spring 72 is not substantially compressed and its length remains unchanged, and the second slider 70 and the third slider 71 move integrally from the first position to the second position. In the second unit 7, the face portion 710 of the third slider 71 faces the bottom wall 730 on the side closer to the bottom wall 730 of the main body 73, and the compression piece 713 protrudes into the opening 7300 in the bottom wall 730.The closing device 5 is attached with the bottom wall 730 abutting or adjacent to the case of the opening / closing device M so that the brake release lever ML is received in the opening 7300 of the bottom wall 730 of the second unit 7. The pressing piece 713 is located on a first side of the brake release lever ML. When the closing device 5 is activated, the first slider 60 slides from the first position to the second position, and the protruding piece 603 of the first slider 60, located in the opening 703 of the second slider 70, moves to the second side, causing the second slider 70, the second coil spring 72, and the third slider 71 to move integrally from the first position to the second position, and the pressing piece 713 presses the brake release lever ML to the second side, thereby rotating the brake release lever in the brake release direction. The operating force due to the expansion of the first coil spring 61 is transmitted directly from the first slider 60 to the second slider 70, and the brake release lever is pressed by the compression piece 713 of the third slider 71, which slides integrally with the second slider 70, so that the spring force of the first coil spring 61 can be output efficiently and stably as a brake release force. A brake return wire (wire W1) that pulls the third slider 71 toward the first side when an obstacle is detected is connected to the third slider 71, and when an obstacle is detected, the third slider 71 is pulled toward the first side, and the force acting on the wire W1 at this time is the first force, so that the coil spring 72 is compressed and the third slider 71 moves toward the first side independently of the second slider 70 (which is in the second position), thereby releasing the brake. When the obstacle is removed, the force pulling the wire W1 is released, and the second restoring force of the second coil spring causes the third slider 71 to slide to the first position, restoring the brake. At this time, the first compressive force of the first coil spring 61 (the force that compresses the first coil spring 61 when the first slider 60 is in the second position) is greater than the second compressive force of the second coil spring 72 (the force that compresses the second coil spring 72 at its normal length) and the second restoring force (the force that expands the compressed second coil spring 72), so the force pulling the wire W1 does not affect the second slider 70 and the first slider 60 in the second position.The first slider 60 and the second slider 70 can slide together from the second position to the first position, and when the activated closing mechanism is restored, the first slider 60, which is in the second position, is slid to the first position, and the second slider 70 and the third slider 71, which are in the second position, slide together to the first position.

[0072] The closing device 5 requires assembly by arranging many components in predetermined locations in a limited space. However, the closing device 5 according to this embodiment can be assembled by separately assembling the first unit 6 and the second unit 7, then stacking the first unit 6 and the second unit 7 and connecting them with screws, improving on-site assembly workability. More specifically, when the first unit 6 and the second unit 7 are delivered to the site, the second unit 7 is fixed to the opening / closing device M by receiving the brake release lever ML within the opening 7300 in the bottom wall 730 of the main body 73, and one end of the wire W1 is fixed to the third slider 71 of the second unit 7. At this time, the other end of the wire W1 is not attached to the relay device 8. One end of the wire W3 is fixed to the holding means 62 of the first unit 6. At this time, the attachment and adjustment of the other end of the wire W3 to the manual operation unit of the operation box 10 is not performed. The first unit 6 is placed on the second unit 7 by inserting the protruding piece 603 of the first slider 60 of the first unit 6 into the opening 703 of the surface portion 700 of the second slider 70 of the second unit 7, and then the main body 64 of the first unit 6 and the main body 73 of the second unit 7 are fixed with screws. Then, the other end of the wire W1 and the other end of the wire W3 are attached and adjusted. At this time, one end of the wire W1 is connected to the third slider 71, and a second coil spring 72 is interposed between the third slider 71 and the second slider 70. The position of the second slider 70 is fixed by inserting the protruding piece 603 of the first slider 60 into the opening 703 of the second slider 70. Therefore, the third slider 71 cannot move toward the first side unless a large force is applied to compress the second coil spring 72. The second coil spring 72 is not compressed by a force that is applied by manually pulling the other end of the wire W1. Therefore, when attaching the other end of the wire W1 to the relay device 8, the position of the wire W1 does not move, and the attachment adjustment of the wire W1 can be easily performed. For example, in the device disclosed in Patent Document 1, the wire W1 is temporarily fixed with a fixing piece, and then the attachment adjustment is performed on the relay device.

[0073] [B-4] Operation of the closing device [B-4-1] Steady state Figure 15 shows the closing device 5 in a standby or steady state. The first slider 60 and holding means 62 of the first unit 6, and the second slider 70 and third slider 71 of the second unit 7 are in the first position, the locking portion 621 of the holding means 62 is locked to the locked portion 606 of the first slider 60, the wire W3 is in a tensioned state, the solenoid 63 is in a non-energized state, and the shaft portion 630 is in the first position. The first coil spring 61 is in a compressed state. The protruding piece 603 of the first slider 60 is located within the opening 703 of the face portion 700 of the second slider 70, abutting or adjacent to the edge of the opening. The brake release lever ML of the opening / closing device M is in the first position (brake activated state), and the pressing piece 73 of the third slider 71 of the second unit 7 is abutting (non-pressed state) or adjacent to the brake release lever ML (top view of Figure 20).

[0074] [B-4-2] Operation of the automatic closing mechanism When a fire detection signal is input in the event of a fire, the automatic closing mechanism is activated, causing the shutter curtain 1 to descend under its own weight. Specifically, based on the input of the fire detection signal, the solenoid 63 is energized and pulls the shaft 630, thereby rotating the locking portion 621 of the holding means 62 in the direction opposite to the locking direction, releasing the locking state between the locking roller 6211 of the locking portion 621 and the locked portion 606 of the first slider 60, and the first coil spring 61 expands, causing the first slider 60 to slide from the first position to the second position, and in conjunction with the movement of the protruding piece 603 of the first slider 60 from the first position to the second position, the second slider 70, the third slider 71, and the second coil spring 72 slide integrally to the second position. When the third slider 71 moves to the second position, the pressing piece 713 of the third slider 71 presses the brake release lever to release the brake, causing the shutter curtain to descend under its own weight.

[0075] Figure 16 shows the closing device 5 after the automatic closing mechanism has been activated. The first slider 60 of the first unit 6 and the second slider 70 and third slider 71 of the second unit 7 are in the second position, and the locking portion 621 of the holding means 62 and the locked portion 606 of the first slider 60 are disengaged. The wire W3 is in a tensioned state, and the solenoid 63 returns to a non-energized state after a momentary energization, but the locking portion 621 is resting on the locked portion 606, and the shaft portion 630 is in a tensioned position. The first coil spring 61 is in an elongated state. The length of the coil spring 66 is longer than in the state shown in Figure 15 by the amount by which the connecting piece 625 is pulled toward the first side by the shaft portion 630. The coil spring 67 is in an elongated state (center view of Figure 22). The protruding piece 603 of the first slider 60 abuts against the edge of the opening 703 of the face portion 700 of the second slider 70, the brake release lever ML of the opening / closing device M is in the second position (brake released state), and the pressing piece 73 of the third slider 71 of the second unit 7 abuts against the brake release lever ML and presses the brake release lever ML in the brake release direction (center diagram in FIG. 20). In addition, the protruding piece 605 of the first slider 60 protrudes from the opening 6420 of the second side wall 642 of the main body 64 of the first unit 6 so that the protruding amount is large.

[0076] [B-4-3] Brake recovery after automatic closing mechanism activation When the shutter curtain 1, which is descending under its own weight, hits an obstacle and the obstacle is detected, the brake return wire (wire W1 + wire W2) is pulled, and the third slider 71 connected to one end of the wire W1 is pulled to the first side from the second position toward the first position, and the third slider 71 slides toward the first side independently of the second slider (which maintains the second position) 70 while the second rising piece 712 of the third slider 71 compresses the second coil spring 72 (at this time, a spring force toward the second side is stored in the third slider 71), and the pressure on the brake release lever ML by the pressure piece 713 of the third slider 71 in the brake release direction is released, the brake is returned, and the shutter curtain 1, which is descending under its own weight, stops.

[0077] Figure 17 shows the brake reset state after activation of the automatic-closing mechanism. The third slider 71 has slid further from the first position toward the second side, the second slider 70 is in the second position, and the second coil spring 72 is in a compressed state. The compression piece 713 of the third slider 71 is separated from the brake release lever ML, and the compression of the brake release lever ML by the compression piece 713 in the brake release direction is released, resulting in the brake being reset (bottom diagram of Figure 20). The position and posture of each component of the first unit 6 (first slider 60, first coil spring 61, holding means 62, etc.) are the same as those in the state after activation of the automatic-closing mechanism. In this state, when the obstacle is removed, the tension in the brake return wire (wire W1 + wire W2) is released, wire W1 loosens, and the third slider 71 slides toward the second side to the second position due to the force of the compressed second coil spring 72, and the compression piece 713 of the third slider 71 presses the brake release lever ML in the brake release direction, releasing the brake again, resulting in the state shown in the center of Figures 16 and 20, and the shutter curtain 1 descends again under its own weight.

[0078] [B-4-4] Operation of manual closing mechanism When the opening is fully open, the manual closing mechanism can be activated by pressing the emergency close switch 102 on the operation box 10, causing the shutter curtain 1 to descend under its own weight. Specifically, when the emergency close switch 102 is pressed, the tensioned wire W3 is loosened, releasing the force holding the holding means 62 in the first position, and the first coil spring 61 is extended, causing the first slider 60 and the holding means 62 to slide together from the first position to the second position while the holding means 62 is engaged with the first slider 60. In conjunction with the movement of the protruding piece 603 of the first slider 60 from the first position to the second position, the second slider 70, the third slider 71, and the second coil spring 72 slide together to the second position. When the third slider 71 moves to the second position, the pressing piece 713 of the third slider 71 presses the brake release lever ML in the brake release direction, releasing the brake and causing the shutter curtain 1 to descend under its own weight.

[0079] Figure 18 shows the closing device 5 after the manual closing mechanism has been activated. The first slider 60 and holding means 62 of the first unit 6, and the second slider 70 and third slider 71 of the second unit 7 are in the second position, and the locking portion 621 of the holding means 62 and the locked portion 606 of the first slider 60 are in a locked state. The wire W3 is in a slack state, the solenoid 63 is in a non-energized state, and the shaft portion 630 is extended from the first position to the second position in response to the movement of the holding means 62 from the first position to the second position. The first coil spring 61 is in an extended state. The coil spring 66 is compressed compared to the state shown in Figure 15. The protrusion 603 of the first slider 60 is located within the opening 703 of the face portion 700 of the second slider 70 and abuts against the edge of the opening. The pressing piece 73 of the third slider 71 of the second unit 7 abuts against the brake release lever ML and presses the brake release lever ML in the brake release direction, and the brake release lever ML of the opening / closing device M is in the brake released state.

[0080] [B-4-5] Brake return after manual closing mechanism activation When the shutter curtain 1, which is descending under its own weight, hits an obstacle and the obstacle is detected, the brake return wire (W1+W2) is pulled, and the third slider 71 connected to one end of the wire W1 is pulled to the first side from the second position toward the first position, and the third slider 71 slides toward the first position independently of the second slider 70 (which maintains the second position) while the second rising piece 712 of the third slider 71 compresses the second coil spring 72 (at this time, a spring force toward the second side is stored in the third slider 71), and the pressure on the brake release lever by the pressure piece 713 of the third slider 71 is released, the brake is returned, and the shutter curtain, which is descending under its own weight, stops.

[0081] Figure 19 shows the brake reset state after the manual closing mechanism is activated. The third slider 71 has slid further from the first position toward the first side, the second slider 70 is in the second position, and the second coil spring 72 is in a compressed state. The positions and postures of the components of the first unit 6 (first slider 60, first coil spring 61, retaining means 62, etc.) are the same as those after the manual closing mechanism is activated. When the obstacle is removed, the tension in the brake reset wire (wire W1 + wire W2) is released, wire W1 is loosened, and the third slider 71 slides toward the second side to the second position due to the biasing force of the compressed second coil spring 72. The compression piece 713 of the third slider 71 presses the brake release lever, releasing the brake again, resulting in the state shown in Figure 18, and the shutter curtain 1 is lowered again under its own weight.

[0082] [B-5] Restoration of activated closing device The operation box 10 according to this embodiment is equipped with an automatic closing mechanism and a manual closing mechanism recovery function in addition to a manual closing function. The operation box 10 is provided with an emergency closing switch 102 for manual closing and a reset lever 103. The emergency closing switch 102 can be pressed and the reset lever 103 can be manually rotated when the cover 100 of the operation box 10 is closed. One end of the wire W3, a component of the manual closing mechanism, is connected to the holding means 62 of the first unit 6 of the closing device 5. The other end of the wire W3 extends into the operation box 10, where a wire end fixing portion is provided to fix the end (other end) of the wire W3. The position of the wire end fixing portion can be fixed by a locking means. By tensioning the wire W3 and locking the wire end fixing portion, the tensioned state of the wire W3 is maintained. The wire W3 is also a component of the recovery mechanism.

[0083] The operating section of the manual operation unit, specifically the emergency closing switch 102 and the recovery lever 103 of the operation box 10, are mechanically connected to the other end of the wire W3. When the emergency closing switch 102 is pressed, the locking mechanism is released, the wire end fixing part moves upward a predetermined distance, the tensioned wire W3 is loosened, and the recovery lever 103 tilts forward at an angle relative to the surface of the cover body 100 (the operating position of the manual closing mechanism). When the inclined rotating lever 103' is rotated downward and forward, the wire end fixing part is pulled down to the locked position and the wire W3 is pulled a predetermined distance. With tension applied to the wire W3, the movement of the wire W3 is restricted by the locking mechanism. Thereafter, the rotating lever 103'' is rotated upward and stored in the operation box 10, resulting in the set state.

[0084] The first slider 60 and first coil spring 61 of the first unit 6 of the closing device 5, and the wire W3 are elements common to the automatic closing mechanism and the manual closing mechanism, and the recovery lever 103 is a common operating part for recovering the closing device (automatic closing mechanism, manual closing mechanism) 5, and the recovery lever 103 recovers the activated closing device (automatic closing mechanism, manual closing mechanism) 5 by pulling the wire W3. In other words, the recovery device according to this embodiment can recover the automatic closing mechanism and the manual closing mechanism with a single recovery device. There is no need for a recovery device for recovering the automatic closing device as disclosed in Patent Document 1, and the number of components of the entire closing device, including the recovery device, can be reduced, resulting in a closing device with a simpler configuration.

[0085] [B-5-1] Restoration of automatic closing mechanism The upper diagram of Figure 22 shows the closing device 5 in a steady state. The first slider 60 and holding means 62 of the first unit 6, and the second slider 70 and third slider 71 of the second unit 7 are in the first position, the locking roller 6211 of the locking portion 621 of the holding means 62 is locked to the locked portion 606 of the first slider 60, the wire W3 is in a tensioned state, the solenoid 63 is in a non-energized state, and the shaft portion 630 is in the first position. The first coil spring 61 (not shown in the upper diagram of Figure 22) is in a compressed state.

[0086] When the automatic closing mechanism is activated from this state, the solenoid 63 is energized based on the input of a fire detection signal, pulling the shaft 630 toward the first side, thereby rotating the locking portion 621 of the holding means 62 in the direction opposite to the locking direction, releasing the locking state between the locking roller 6211 of the locking portion 621 and the locked portion 606 of the first slider 60. As the first coil spring 61 expands, the first slider 60 slides from the first position to the second position, and in conjunction with the movement of the protruding piece 603 of the first slider 60 from the first position to the second position, the second slider 70, the third slider 71, and the second coil spring 72 slide together to the second position. As the third slider 71 moves to the second position, the pressing piece 713 of the third slider 71 presses the brake release lever, releasing the brake and causing the shutter curtain 1 to descend under its own weight.

[0087] The center diagram in Figure 22 shows the closing device 5 after the automatic closing mechanism has been activated. The first slider 60 of the first unit 6 and the second slider 70 and third slider 71 of the second unit 7 are in the second position, and the locking portion 621 of the holding means 62 and the locked portion 606 of the first slider 60 are disengaged. The wire W3 is in a tensioned state, and the solenoid 63 returns to a non-energized state after a momentary energization, but the locking roller 6211 of the locking portion 621 remains in contact with the locked portion 606. When the automatic closing mechanism is activated and the first slider 60 slides from the first position to the second position, the wire W3 is in a tensioned state, and the holding means 62 maintains the first position. The coil spring 67 is pulled by the first slider 60 and extends, and a biasing force in the direction of sliding from the first position to the second position is stored in the holding means 62.

[0088] When the wire W3, which is in a taut state, is loosened by the first operation of the manual operation unit (pressing the emergency closing switch 102) after the automatic closing mechanism is activated as shown in the central diagram of Figure 22, the retaining means 62 is pulled toward the second side by the force of the coil spring 67, moving from the first position to the second position.

[0089] At this time, the locking roller 6211 of the locking portion 621 of the holding means 62 is in point contact with the locked portion 606 of the first slider 60 in the second position and is biased in the locking direction by the coil spring 66. When the holding means 62 in the first position slides to the second position, the locking roller 6211 climbs over the locked portion 606 and moves to the second side of the locked portion 606, automatically locking with the locked portion 606 of the first slider 60. This locks the locked portion 606 of the first slider 60 in the second position and the locking roller 6211 of the locking portion 621 of the holding means 62 in the second position. This state is shown in the lower diagram of Figure 22. The state shown in the lower diagram of Figure 22 is the same as the state after the manual closing mechanism is activated (Figure 18).

[0090] In this state, by rotating the second operation (recovery lever 103) of the manual operation unit, the wire W3 is pulled toward the other end, and the first slider 60 and holding means 62, which are in the second position, are moved together toward the first side to the first position while maintaining the locked state, to reach the state shown in the upper diagram of Figure 22.Then, by again placing the wire W3 in a taut state and locking and fixing the other end of the wire W3, the activated automatic closing mechanism is restored.

[0091] When the recovery lever 103 is rotated to pull the wire W3, a large force acts on the engagement portion between the engagement roller 6211 of the engagement portion 621 and the engaged portion 606 of the first slider 60, but the coil spring 66 allows the engagement portion 621 to slide stably from the second position to the first position while maintaining the engagement posture. It is thought that the greatest force acts on the locking portion when the wire W3 is fully pulled by the recovery lever 103, but in this embodiment, the coil spring 66 is in its most extended state when the first slider 60 and the holding means 62 are in the first position, and at this time, the coil spring 66 pulls the portion of the locking portion 621 that is away from the pivot point (axis portion 6212) toward the second side via the connecting piece 625, so that the force that urges the locking portion 621 of the holding means 62 in the locking direction (force that maintains the locked state) by the coil spring 66 becomes the greatest, and the locked state will not be released.

[0092] [B-5-2] Restoration of manual closing mechanism To restore an activated manual closing mechanism, the wire W1 is pulled toward the other end by a second operation of the manual operating unit, which moves the first slider 60 and the holding means 62, which are in the second position, to the first position, and the wire W1 is put into a tensile state, thereby restoring the manual closing mechanism.

[0093] [B-6] Movement of the operating part during electric descent Obstacle detection during power lowering will be described with reference to FIG. 21. The upper diagram of FIG. 21 shows the closing device 5 during power opening and closing. The components of the first unit 6 and the second unit 7 of the closing device 5 are in a steady state. Specifically, the first slider 60 and the holding means 62 of the first unit 6, and the second slider 70 and the third slider 71 of the second unit 7 are in a first position, the locking portion 621 of the holding means 62 is locked to the locked portion 606 of the first slider 60, the wire W3 is in a tensioned state, the solenoid 63 is in a non-energized state, and the shaft portion 630 is in the first position. The first coil spring 61 (not shown in FIG. 21) is in a compressed state. The protrusion 603 of the first slider 60 is located within the opening 703 of the surface portion 700 of the second slider 70. By operating the opening / closing operation switch 101 of the operation box 10, the output shaft of the opening / closing device M is rotated via the control unit (obstacle detection control panel 11A, shutter control panel 11B), which rotates the winding shaft forward and backward to raise and lower the shutter curtain 1. The first microswitch SW1 of the second unit 7 detects that the second slider 70 is in the normal position (first position), thereby determining that the shutter is in the electric opening / closing mode.

[0094] When the seat plate 3 at the lower end of the shutter curtain 1 abuts against an obstacle during the electric descent of the shutter curtain 1, the locking device 9 restricts the withdrawal of the brake return wire (W1+W2), and the wire W1 pulls the third slider 71 toward the second side, causing the third slider 71 to move from its normal position toward the second side while compressing the second coil spring 72. When the second microswitch SW2 detects this movement of the third slider 71, an obstacle detection signal is sent to the obstacle detection control panel 11A. When the obstacle detection signal is input to the obstacle detection control panel 11A, the electric descent of the opening / closing device M is stopped via the shutter control panel 11B (in one embodiment, after stopping, it is raised once and then stopped again, i.e., touched up). When the obstacle is removed, the pulling force of the brake return wire (W1+W2) is released, the compressed second coil spring 72 expands, the second slider 71 returns to its normal position, the input of the obstacle detection signal is released, and electric opening and closing operation becomes possible.

[0095] [C] Control section In the electric shutter with mechanical harm prevention device according to the present invention, different controls are performed in the electric opening / closing mode (normal mode) and the gravity descent mode (fire mode). During normal electric opening / closing, the operation control of the shutter curtain 1 is performed in the normal mode. During gravity descent due to activation of the automatic closing mechanism based on input of a fire detection signal or activation of a manual closing operation, the control mode changes from the normal mode to the gravity descent mode, and the operation control of the shutter curtain 1 is performed in the gravity descent mode. In this embodiment, the control unit comprises an obstacle detection control panel 11A and a shutter control panel 11B. This will be explained in detail below.

[0096] [C-1] Electric opening / closing mode In normal mode, the shutter curtain 1 is electrically opened and closed by operating the push button of the opening / closing operation switch 101. More specifically, when the opening switch U is pressed with the opening fully closed or half-open, a signal is sent to the shutter control panel 11B via the obstacle detection control panel 11A, and the opening / closing device M is activated to rotate the winding shaft in a first direction and lift the shutter curtain 1 while winding it up. As the shutter curtain 1 lifts up, the wire W2 is wound up onto the winding drum of the locking device 9. When the shutter curtain 1 lifts up to a preset upper limit position, the upper limit switch is activated to stop the operation of the opening / closing device M, stopping the rotation of the winding shaft and stopping the winding of the shutter curtain 1.

[0097] When the closing switch D is pressed while the opening is fully or partially open, a signal is sent to the shutter control panel 11B via the obstacle detection control panel 11A, which activates the opening / closing device M and rotates the winding shaft in the second direction to lower the shutter curtain 1. As the shutter curtain 1 lowers, the wire W2 is pulled out from the winding drum while extending along the surface of the shutter curtain 1. When the lower seat plate 31 at the bottom end of the shutter curtain 1 hits an obstacle while it is being lowered, the lower seat plate 31 moves upward relative to the upper seat plate 30, and the locking device 9 restricts the withdrawal of the wire W2. As the upper seat plate 30 moves downward relative to the lower seat plate 31, the wire W2 whose withdrawal is restricted is pulled, and the wire W1 is pulled via the relay device 8, which moves the third slider 71 from its normal position to the first side (the right side in the figure), turning the second microswitch SW2 from OFF to ON, and an obstacle detection signal (seat plate activation signal) is sent to the obstacle detection control panel 11A. The obstacle detection control panel 11A, which has received the obstacle detection signal, stops the operation of the opening / closing device M for a predetermined time (for example, 1 second) via the shutter control panel 11B, and then operates the opening / closing device M to reverse and raise (touch up) the shutter curtain 1 for a predetermined time (for example, 1.5 seconds), after which it stops. Thereafter, by pressing the close switch D of the opening / closing operation switch 101, the shutter curtain 1 can be electrically lowered again.

[0098] When the lower plate 31 at the bottom of the electrically descending shutter curtain 1 lands, the lower plate 31 moves upward relative to the upper plate 30, the locking device 9 restricts the withdrawal of the wire W2, and the upper plate 30 moves downward relative to the lower plate 31, pulling the wire W2 whose withdrawal is restricted, and the wire W1 is pulled via the relay device 8, the third slider 71 moves from the normal position to the second side (the right side in the figure), the second microswitch SW2 changes from OFF to ON, and an obstacle detection signal is sent to the obstacle detection control panel 11A. Having received the obstacle detection signal, the obstacle detection control panel 11A stops the operation of the opening / closing device M via the shutter control panel 11B, thereby stopping the descent of the shutter curtain 1.

[0099] [C-2] Gravity Descent Mode When the automatic closing mechanism is activated by input of a fire detection signal from the disaster prevention panel 4b, the first slider 70 and the holding means 62 are disengaged, the first slider 70 slides from the first position to the second position, and in conjunction with the movement of the first slider 60, the second slider 70 and the third slider 71 slide from the first position to the second position, and the brake is released. Alternatively, when the tension on the wire W1 is released by pressing the emergency closing switch 102, the tension maintaining the holding means 62 in the first position is released, and the first slider 70 and the holding means 62 slide together from the first position to the second position, and in conjunction with the movement of the first slider 60, the second slider 70 and the third slider 71 slide from the first position to the second position, and the brake is released. When the second slider 70 slides from the first position to the second position, causing the first microswitch SW1 to change from ON to OFF, an operation confirmation signal is continuously output from the second unit 7 to the obstacle detection control panel 11A, and upon receiving the operation confirmation signal, the obstacle detection control panel 11A changes from the electric opening / closing mode (normal mode) to the gravity descent mode (fire mode). When the obstacle detection control panel 11A enters the gravity descent mode, the electric opening / closing operations (push button operations for electric opening and closing) from the open switch U, close switch D, and stop switch S of the opening / closing operation switch 101 are disabled, and if the shutter curtain 1 is being electrically opened or closed, the movement of the shutter curtain 1 is stopped and gravity descent begins immediately.

[0100] When the lower plate 31 at the lower end of the shutter curtain 1 hits an obstacle while it is descending under its own weight, the lower plate 31 moves upward relative to the upper plate 30, the locking device 9 restricts the withdrawal of the wire W2, and the upper plate 30 moves downward relative to the lower plate 31, pulling the wire W2 whose withdrawal is restricted, and the wire W1 is pulled via the relay device 8, and the third slider 71, which has moved to the brake release position, moves to the second side toward the first position, the brake of the opening / closing device M is restored, and the shutter curtain 1, which is descending under its own weight, stops.

[0101] When the obstacle is removed, the lower plate 31 that has moved up can move down, the restriction on the withdrawal of the wire W2 is released, the second coil spring 72 expands, the third slider 71 moves to the brake release position, the brake release lever ML releases the brake of the opening / closing device M, and the shutter curtain 1 descends again under its own weight. When the lower plate 31 at the bottom of the shutter curtain 1 lands on the floor while it is descending under its own weight, the lower plate 31 moves up relative to the upper plate 30, the locking device 9 restricts the withdrawal of the wire W2, and the upper plate 30 moves down relative to the lower plate 31, pulling the wire W2 whose withdrawal has been restricted, and the wire W1 is pulled via the relay device 8, moving the third slider 71 from the brake release position to its normal position and resetting the brake. The brake of the opening / closing device M is reset, and the shutter curtain 1, which is descending under its own weight, stops and becomes fully closed.

[0102] [D] Closure device with improved workability during construction The closing device 5 of this embodiment is constructed by assembling the first unit 6 and the second unit 7 by stacking them in a direction perpendicular to the sliding movement direction of the first slider 60, the second slider 70, and the third slider 71, and as shown in Figure 3, the first unit 6 and the second unit 7 are assembled so as to overlap in the protruding direction of the brake release lever ML of the opening / closing device M.

[0103] [D-1] Screws used to assemble the first unit As shown in FIG. 6, the main body 64 of the first unit 6 incorporates a first slider 60, a first coil spring 61, a retaining means 62, a solenoid 63, a slide shaft 65, and a microswitch SW. The first unit 6 is equipped with an automatic closing mechanism, which includes a retaining means 62 that engages with the first slider 60 to retain it in the first position, and a solenoid 63 that is activated by energization based on a fire detection signal to release the engagement between the first slider 60 in the first position and the retaining means. One end of a wire W3, which is a manual closing wire, is connected to the retaining means 62, and the other end of the wire W3 is connected to a reset lever 103 (see FIGS. 1 and 5) of the manual closing mechanism. One end of an outer wire W3' is connected to the main body 64 of the first unit 6.

[0104] As shown in FIGS. 23 and 25 , the longitudinal ends of the slide shaft 65 are fixed to the first side wall 641 and the second side wall 642 of the main body 64 using screws S1, and the heads of the screws S1 are exposed on the outer surfaces of the first side wall 641 and the second side wall 642. A pair of first portions 680 and a second portion 681 are fixed to the outer surface of the first side wall 641 of the main body 64 of the first unit 6 using screws S2 via the second portions 681, and the heads of the screws S2 are exposed. A pair of third portions 682 extending parallel to the first portions 680 are formed between the pair of first portions 680 of the mounting piece 68. The heads of screws S3 are exposed on the outer surface of the first side wall 641 of the main body 64 of the first unit 6 for attaching a plate-shaped member that supports the solenoid 63 of the holding means 62. An L-shaped member forming a contact rising piece 643 is fixed to the bottom wall 640 of the main body 64 with a screw S4, and the head of the screw S4 is exposed on the outer surface of the bottom wall 640. The heads of screws 623 and 624 that attach the guide plate 622 of the holding means 62 are exposed on the outer surface of the bottom wall 640 of the main body 64 of the first unit 6.

[0105] 25 , one end of the wire W3 is locked on a first edge of an opening 6206 formed in a base 620 of the holding means 62, and the wire W3 is sandwiched between the base 620 and a presser plate 690 and fixed by tightening two screws 69. The presser plate 690 according to this embodiment is rotatable with the shank of one screw 69 inserted therethrough, and the shank of the other screw 69 is received in a locking recess 691. The wire W3 is inserted through an outer wire W3′, and with the outer wire W3′ positioned between the pair of third portions 682, the outer wire W3′ is sandwiched between a presser plate 690′ and fixed to the main body 64 by tightening two screws 69′.

[0106] As described above, the first unit 6 is constructed by assembling multiple elements using multiple screws, but the multiple screws (S1, S2, S3, S4, 69, 69', 623, 624) exposed to the outside of the main body 64 of the first unit 6 consist of a first group (screws 69, 69') that are used when constructing the first unit 6 at the site, and a second group (screws S1, S2, S3, S4, 623, 624) that are not used during construction.

[0107] 23 and 25, the screws 69, 69' belonging to the first group are black, while the screws S1, S2, S3, S4, 623, 624 belonging to the second group are metallic (silver), the same as the metallic (silver) color of the main body 64 and the first slider 60. The multiple screws 69, 69' belonging to the first group and the multiple screws S1, S2, S3, S4, 623, 624 belonging to the second group are visually distinguishable by having different screw colors.

[0108] [D-2] Screws used to assemble the second unit As shown in Figures 11 and 21, the second slider 70, the third slider 71, the second coil spring 72, the slide shaft 74, the first microswitch SW1, and the second microswitch SW2 are assembled in the main body 73 of the second unit 7. One end of the wire W1 (which constitutes a brake return wire together with the wire W2) is connected to the third slider 71 of the second unit 7. The other end of the wire W1 is connected to the relay device 8 (see Figure 1). One end of the outer wire W1 is connected to the main body 73 of the second unit 7.

[0109] As shown in Figures 24 and 26, the longitudinal ends of the slide shaft 74 are fixed to the first side wall 731 and the second side wall 732 of the main body 73 using screws S1, and the heads of the screws S1 are exposed on the outer surfaces of the first side wall 731 and the second side wall 732.

[0110] 26 , with one end of the wire W1 locked between a pair of bent pieces 714 of the third slider 71, the end of the wire W1 is sandwiched between the bent pieces 714 and a presser plate 770 and fixed by tightening two screws 77. The presser plate 770 according to this embodiment is rotatable with the shank of one screw 77 inserted therethrough, and the shank of the other screw 77 is received in the locking recess 771. The wire W1 is inserted through an outer wire W1′, and with one end of the outer wire W1′ positioned between a pair of central bent pieces 7311, the outer wire W1′ is sandwiched between the presser plate 780 and fixed to the main body 73 by tightening two screws 78.

[0111] A screw 76 is provided on the second side wall 732 of the second unit 7. The screw 76 is composed of a hexagonal head 760 and a shaft 761. The shaft 761 extends in the sliding movement direction of the second slider 70, and the tip of the shaft 761 is able to abut against the tip edge of the protrusion 700′ on the second side of the face 700 of the second slider 70 (see FIG. 26).

[0112] As described above, the second unit 7 is constructed by assembling multiple elements using multiple screws, but the multiple screws (S1, 76, 77, 78) exposed to the outside of the main body 73 of the second unit 7 consist of a first group (screws 76, 77, 78) that are used when constructing the first unit 6 at the site, and a second group (screw S1) that are not used during construction.

[0113] The screws 76, 77, 78 belonging to the first group are black, and the screws S1 belonging to the second group are a metallic color (silver), which is the same metallic color (silver) as the main body 64, the second slider 70, and the third slider 71. The multiple screws 76, 77, 78 belonging to the first group and the multiple screws belonging to the second group are visually distinguishable by having different screw colors.

[0114] The screws 76, 77, 78 belonging to the first group are further divided into screws 77, 78 belonging to a first subgroup that are screwed in a first direction (a direction perpendicular to the sliding movement direction of the first slider 70 and the second slider 71), and screws 76 belonging to a second subgroup that are screwed (forward and backward) in a second direction (the sliding movement direction of the first slider 70 and the second slider 71) that is perpendicular to the first direction. In this embodiment, the screws 77, 78 belonging to the first subgroup have round heads, and the screws 76 belonging to the second subgroup have hexagonal heads; by making the screws of the first subgroup and the second subgroup have different shapes, they can be visually distinguished from each other.

[0115] [D-3] Screws used to assemble the first and second units The first unit 6 and the second unit 7 are assembled by overlapping and connecting the box-shaped main body 64 and the box-shaped main body 73. In one embodiment, as shown in Fig. 28, the second unit 7 is first attached to the underside of the opening / closing device M, and then the first unit 6 is attached to the second unit 7 attached to the opening / closing device M.

[0116] A screw hole 7312 is formed in each of the bent pieces 7310 formed on both sides in the width direction of the first side wall 731 of the main body 73 of the second unit 7 (see FIG. 26), and a screw 79 is temporarily fixed in each of the screw holes 7312 in advance (see FIG. 28). A locking groove 683 capable of receiving the shank of the screw 79 is formed in each of the pair of first portions 680 of the mounting piece 68 of the first unit 6 (see FIG. 25). With the second unit 7 attached to the opening / closing device M, the locking groove 683 of the first unit 6 can be locked onto the screw 79, allowing one end of the first unit 6 to be supported and rested on the second unit 7. The screws 79 in this embodiment are black.

[0117] A hole (which may be a screw hole or an insertion hole) 6404 is formed in a corner on the other end side of the bottom wall 640 of the main body 64 of the first unit 6 (see FIG. 25), and screw holes 7321 are formed in the bent pieces 7320 formed on both widthwise sides of the second side wall 732 of the main body 73 of the second unit 7 (see FIG. 26). With the locking groove 683 on the tip side of the first unit 6 engaged with the screw 79 of the second unit 7, the base end side of the first unit 6 is rotated upward with the tip side as a fulcrum, and the hole 6404 formed in the bottom wall 640 of the main body 64 of the first unit 6 is aligned with the screw hole 7321 formed in the bent piece 7320 of the second unit 7, and fixed from below with a screw 79' (see FIG. 27). The screw 79' in this embodiment is a black screw.

[0118] [D-3] Construction of the first and second units on site The first unit 6 and the second unit 7 constitute a fire shutter closing device after being installed on-site. The first unit 6 includes a first slider 60 movable on a slide shaft 65 and a first coil spring 61 that biases the first slider 60 in a first direction. In the event of a fire, the automatic closing mechanism is activated to move the first slider 60 in the first direction from the first position to the second position. As shown in FIG. 6 , the first unit 6 includes the first slider 60 and a retaining means 62 that is engaged with the first slider 60 to form a slider unit (first slider unit). A wire W3 can be connected to the retaining means 62 that forms the slider unit. By loosening the tensioned wire W3 using the emergency closing switch 102 of the manual closing mechanism, the biasing force of the first coil spring 61 is used to move the slider unit in the first direction from the first position to the second position.

[0119] The second unit 7 includes a slider unit (second slider unit) movable on a slide shaft 74. The slider unit includes a second slider 70 movable in conjunction with the movement of the first slider 60, and a third slider 71 provided with a second coil spring 72 between the second slider 70 and the second slider 70. When the second slider 70 moves in a first direction from the first position to the second position, the third slider 71 moves integrally with the second slider 70 via the second coil spring 72 to release the brake of the opening / closing device M, and compresses the second coil spring 72 to move in a second direction toward the first position independently of the second slider 70 to release the brake of the opening / closing device M. A wire W1 constituting a brake release wire that pulls the third slider 71 in the second direction when an obstacle is detected can be connected to the third slider 71 of the slider unit.

[0120] The first unit 6 and the second unit 7 are provided with interlocking means for interlocking the first slider 60 and the second slider 70. In this embodiment, the first slider 60 is provided with a protrusion 603 extending toward the second unit, and the second slider 70 is provided with an opening 703 that receives the protrusion 603 of the first slider 60, the protrusion 603 being positioned within the opening 703 so as to be able to abut against the edge of the opening 703, and the protrusion 603 and the opening 703 constitute the interlocking means.

[0121] As shown in the upper diagram of Figure 29, the slider unit consisting of the second slider 70, the third slider 71, and the second coil spring 72 is capable of sliding in the left and right directions (first direction, second direction) on the slide shaft 74 when in a free state.

[0122] As shown in the central diagram of Figure 29, the slider unit consisting of a second slider 70, a third slider 71, and a second coil spring 72 has its first position determined by a screw 76 as a first movement restriction means that restricts movement in the first direction and a spacer 75 as a second movement restriction means that restricts movement in the second direction.

[0123] As shown in FIG. 33 , the spacer 75 includes a rectangular surface portion 750 in a plan view and a pair of side surfaces 751 extending vertically and facing each other from both longitudinal ends of the surface portion 750. One side edge of the side surface portion 751 includes a vertical edge 752, and the other side edge includes a first vertical edge 753 closer to the surface portion 750, a second vertical edge 754 farther from the surface portion 750, and a horizontal edge 755 extending between the first vertical edge 753 and the second vertical edge 754. The shortest distance d1 between the vertical edge 752 and the first vertical edge 753 is the same as the width of the bottom surface portion 750 in the short direction, and the shortest distance d2 between the vertical edge 752 and the second vertical edge 754 is shorter than d1. In this embodiment, two distances d1 and d2 can be set by using one type of spacer 75. When the spacer 75 sets the distance d2, it is indicated as a spacer 75′ (see the lower diagram in FIG. 31 ).

[0124] The screw 76 is threaded into the second side wall 732 of the main body 73 of the second unit 7, and when the head 76 is in the deepest screwed position with the head 76 abutting against the outer surface of the second side wall 732, the tip of the shaft 761 abuts against the tip edge of the protrusion 700' of the second slider 70, thereby determining the first position of the second slider 70 and restricting movement of the second slider 70 in the first direction from this state. When installing the second unit 7 or when installing the first unit 6 to the second unit 7, if the slider unit (second slider 70, third slider 71, second coil spring 72) in the first position moves a predetermined distance in the first direction, the pressing piece 713 of the third slider 71 presses the brake release lever ML, which may accidentally release the brake of the opening / closing device M during the installation work and cause the shutter curtain 1 to start descending under its own weight. In this embodiment, the tip of the shaft portion 761 (extending in the movement direction of the slider unit) of the screw 76 abuts against the tip edge of the protrusion portion 700' of the second slider 70, thereby restricting the slider unit in the first position from moving in the first direction.

[0125] As shown in the center diagram of Figure 29, the spacer 75 is positioned so as to be sandwiched between the outer surface of the first rising piece 711 of the third slider 71 and the inner surface of the first side wall 731 of the main body 73, and movement of the third slider 71 in the second direction from this state is restricted. The center diagram of Figure 29 and the upper diagram of Figure 31 are substantially the same diagram, and as shown in the upper diagram of Figure 31, a vertical edge 752 of the spacer 75 abuts against the outer surface of the first rising piece 711 of the third slider 71, and a vertical edge 753 of the spacer 75 abuts against the inner surface of the first side wall 731 of the main body 73, thereby determining a first position of the slider unit consisting of the second slider 70, the third slider 71, and the second coil spring 72, and movement in the second direction from this state is restricted.

[0126] As described above, the first position of the slider unit is determined by restricting the movement of the slider unit, which is made up of the second slider 70, the third slider 71, and the second coil spring 72, in the first and second directions using the screw 76 and the spacer 75. When the slider unit is in the first position, the first position of the third slider 71 is determined, and the third slider 71, to which the wire W1 is connected, is positioned. As shown in the lower diagram of Figure 29, the wire W1 is designed to be set in the appropriate position by connecting the wire W1 to the third slider 71, which has been positioned by the positioning means made up of the screw 76 and the spacer 75.

[0127] 26, the presser plate 770, which is in a first position extending in a direction perpendicular to the longitudinal direction of one end of the wire W1, is rotated about the shank of one of the screws 77 as a pivot point to assume a second position extending in the longitudinal direction of one end of the wire W1 to be attached, and the end of the one end of the wire W1 is locked between the pair of bent pieces 714 of the third slider 71 to assume a locked state. The presser plate 770 is then rotated to assume the first position, and the shank of the other screw 77 is received in the locking recess 771. The two screws 77 are then tightened to fix the end of the one end of the wire W1 to the third slider 71.

[0128] The wire W1 is inserted through the outer wire W1', and with one end of the outer wire W1' positioned between a pair of central bent pieces 7311, the outer wire W1' is clamped by a pressure plate 780 and fixed by tightening two screws 78.

[0129] In this embodiment, the screws 77, 78 are black, which allows them to be distinguished by color from other parts of the second unit 7 (such as the main body 73, second slider 70, and third slider 71) that include the other screws S1. This makes it easy to identify the screws 77, 78 to be used and their positions during installation. Therefore, by indicating in advance that the black screws are the screws to be used during installation, the screws 77, 78 to be used can be identified and accessed without hesitation, and it also prevents other screws S1 from being loosened or removed by mistake. It will be understood by those skilled in the art that when the screws 77, 78 are tightened when the second unit 7 is delivered to the site, the screws 77, 78 must be loosened prior to the operation of connecting the wire W1 and the outer wire W1′.

[0130] The spacer 75 is removed after the wire W1 is set in the appropriate position. In one embodiment, as shown in the upper diagram of FIG. 30 , the screw 76 is slightly loosened to allow the slider unit, consisting of the second slider 70, the third slider 71, and the second coil spring 72, to move in the first direction. This makes the distance between the outer surface of the first rising piece 711 of the third slider 71 and the inner surface of the first side wall 731 of the main body 73 greater than d1, allowing the spacer 75 to be easily removed. As shown in the lower diagram of FIG. 30 , after the spacer 75 is removed, the screw 76 is again tightened to bring the tip of the shaft portion 761 of the screw 76 into contact with the tip edge of the protruding portion 700′ of the second slider 70. This prevents the second slider 70, which is in the first position, from moving in the first direction during work (such as when attaching the first unit 6 to the second unit 7).

[0131] In the first unit 6, a slider unit consisting of a first slider 60 and a holding means 62 engaged with the first slider 60 is biased by a first coil spring 61 to move in a first direction, but before the wire W3 is connected to the holding means 62, the slider unit is set to a temporary fixed position where movement in the first direction is restricted by a spacer 75' serving as a third movement restriction means.

[0132] The lower diagram in Figure 31 shows a state in which a slider unit consisting of a first slider 60 and a retaining means 62 engaged with the first slider 60 is set in a temporary fixed position, with the vertical edge 752 of the spacer 75' abutting against the inner surface of the second side wall 642 of the main body 64 of the first unit 6 and the vertical edge 754 of the spacer 75' abutting against the edge 600' of the face portion 600 of the first slider 60, thereby restricting movement of the first slider 60 in the first direction. The first slider 60 is biased in the first direction by one end of the first coil spring 61 abutting against the inner surface of the second rising piece 602, and the other end of the first coil spring 61 abuts against the abutting rising piece 643, which is a stationary member.Therefore, unless the first coil spring 61 is compressed with a strong force, the slider unit consisting of the first slider 60 and the retaining means 62 engaged with the first slider 60 is restricted from moving in the second direction, and the temporary fixed position is maintained.

[0133] 31, the second slider 70 of the second unit 7 is in the first position, and in the lower diagram, the first slider 60 of the first unit 6 is in the temporary fixed position. In this state, the protrusion 603 of the first slider 60 and the opening 703 of the second slider 70 are aligned, and when the first unit 6 is attached so as to be stacked on the second unit 7, the protrusion 603 of the first slider 6 of the first unit 6 is inserted into the opening 703 of the first slider 7 of the second unit 7 to form interlocking means. In other words, the screw 76, spacer 75, and spacer 75' serving as movement restricting means function as alignment means for the interlocking means. In other words, the screw 76, spacer 75, and spacer 75' serve as alignment and movement restricting means.

[0134] 32, the connection of the wire W3 in the first unit 6 will be described. When a slider unit consisting of the first slider 60 and the holding means 62 engaged with the first slider 60 is in a temporary fixed position, one end of the wire W3 is fixed to the holding means 62. As shown in FIG. 25, the presser plate 690, which is in a first position extending in a direction perpendicular to the longitudinal direction of one end of the wire W3, is rotated about the shank of one screw 69 as a pivot point to assume a second position extending in the longitudinal direction of one end of the attached wire W3. The one end of the wire W3 is engaged with the edge on the first side of the opening 6206 formed in the base 620 of the holding means 62 to assume an engaged state. The presser plate 690 is then rotated to the first position, and the shank of the other screw 69 is received in the engaging recess 691. The two screws 69 are then tightened to fix the one end of the wire W3 to the holding means 62.

[0135] The wire W3 is inserted through the outer wire W3', and the outer wire W3' is positioned between the pair of third portions 682, and then the outer wire W3' is sandwiched between a pressing plate 690' and fixed by tightening two screws 69'.

[0136] In this embodiment, the screws 69, 69' are black, which allows them to be distinguished by color from other parts of the first unit 6 (such as the main body 64 and slider 60) including the other screws S1, S2, S3, S4, 623, and 624. This allows the screws 69, 69' to be used and their positions to be easily identified during installation. Therefore, by indicating in advance that the black screws are the screws to be used during installation, the screws 69, 69' to be used can be identified and accessed without hesitation, and it also prevents the other screws S1, S2, S3, S4, 623, and 624 from being loosened or removed by mistake. It will be understood by those skilled in the art that when the screws 69, 69' are tightened when the first unit 6 is delivered to the site, the screws 69, 69' must be loosened prior to the operation of connecting the wire W3 and the outer wire W3'.

[0137] The other end of the wire W3 is connected to a recovery lever 103 of the manual closing mechanism provided on the operation box 10. At this time, the recovery lever 103 is tilted toward the front relative to the surface of the cover body 100. When the recovery lever 103' is further rotated downward toward the front, the wire end fixing portion is pulled down to the lock position, and the wire W3 is pulled a predetermined distance. With tension applied to the wire W3, the movement of the wire W3 is restricted by the locking means (see FIG. 5). In the state shown in the upper diagram of FIG. 32, by pulling the other end of the wire W3, the slider unit (first slider 60, holding means 62) in the temporary fixing position is pulled slightly in the second direction via the wire W3 and positioned to the first position (see the lower diagram of FIG. 32). At this time, the wire W3 is set to the appropriate position.

[0138] The spacer 75' is automatically removed when the manual closing mechanism is set. Specifically, when the first slider 60 in the temporary fixing position moves in the second direction, the distance between the outer surface of the second rising piece 602 of the first slider 60 and the inner surface of the second side wall 642 of the main body 64 becomes larger than d2, and the spacer 75' automatically falls off.

[0139] In this embodiment, the different distances d1 and d2 are defined by one type of member, thereby standardizing the member and reducing the number of parts, but two types of spacers may also be prepared. Also, the shape of the spacer is not limited to the shape shown in the figure, and it may be, for example, a block or an axial member (typically a screw).

[0140] 34 and 35, the installation process of a closing device consisting of a first unit 6 and a second unit 7 will be described. In one embodiment, the first unit 6 and the second unit 7 are preset in a factory and transported to the site in a temporarily connected state in a stacked box shape (with a U-shaped cross-sectional cover (not shown) attached to cover the open areas on three sides of the first unit 6 and the second unit 7). In this case, the cover is removed at the site, and the first unit 6 and the second unit 7 are disassembled by removing the cover and then removing the black screws 79 and 79'.

[0141] The installation of the second unit 7 will be described with reference to Figure 34. The second unit 7 is installed in a preset state on the opening / closing device M. In the second unit 7, the slider unit consisting of the second slider 70, the third slider 71, and the second coil spring 72 is in a preset state, positioned at the first position, by having the tip of the shaft portion 761 of the screw 76 serving as the first movement restricting means abut against the tip edge of the protruding portion 700' of the second slider 70 and by providing a spacer 75 serving as the second movement restricting means between the first rising piece 711 of the second slider 71 and the first side wall 731 of the main body 73. When the preset second unit 7 is installed in a predetermined position on the opening / closing device M, the compression piece 713 of the third slider 71 of the second unit 7 is set to an appropriate position with respect to the brake release lever ML.

[0142] The wire W1 and outer wire W1' are attached to the second unit 7 attached to the opening / closing device M. One end of the wire W1 is connected to the third slider 71 in the first position using a black screw 77, and the other end of the wire W1 is connected to the relay device 8. One end of the outer wire W1' is connected to the main body 73 of the second unit 7 using a black screw 78.

[0143] After the wire W1 is positioned and fixed to the third slider 71 in the first position, the screws 76 are slightly loosened to remove the spacer 75. The screws 76 are then retightened to restrict movement of the second slider 70 in the first position in the first direction. The first unit 6 is attached to the second unit 7 attached to the opening / closing device M.

[0144] When the second unit 7 is attached to the opening / closing device M, the screw 76 restricts the slider unit (second slider 70, third slider 71, second coil spring 72) in the first position from moving in the first direction, preventing the compression piece 713 of the third slider 71 from accidentally pressing the brake release lever ML, releasing the brake of the opening / closing device M and causing the shutter curtain 1 to start descending under its own weight. When the first unit 6 is attached to the second unit 7 attached to the opening / closing device M, the screw 76 restricts the slider unit (second slider 70, third slider 71, second coil spring 72) in the first position from moving in the first direction, preventing the compression piece 713 of the third slider 71 from accidentally pressing the brake release lever ML, releasing the brake of the opening / closing device M and causing the shutter curtain 1 to start descending under its own weight. Since the screw 76 is a hexagonal screw, the hexagonal head 760 can be rotated in a direction perpendicular to the longitudinal direction of the shaft 761 of the screw 76 to tighten or loosen the screw 76, and even if the space outside the second side wall 732 of the main body 73 of the second unit 7 attached to the opening / closing device M is narrow, the screw 76 can be tightened or loosened relative to the second side wall 732.

[0145] Attachment of the first unit 6 will be described with reference to Figure 35. The first unit 6 is attached in a preset state to the second unit 7 attached to the opening / closing device M. In the first unit 6, the slider unit consisting of the first slider 60 and the holding means 62 engaged with the first slider 60 is in a preset state positioned at a temporary fixed position by providing a spacer 75' as a third movement restricting means between the second rising piece 602 of the first slider 60 and the second side wall 642 of the main body 64.

[0146] The wire W3 and outer wire W3' are attached to the preset first unit 6. One end of the wire W3 is connected to the holding means 62 of the slider unit in the temporary fixing position using a black screw 69, and one end of the outer wire W3' is connected to the main body 64 of the first unit 6 using a black screw 69'.

[0147] The preset first unit 6, with one end of the wire W3 and the outer wire W3′ connected, is attached to the second unit 7 attached to the opening / closing device M using black screws 79, 79′. At this time, the opening 703 of the second slider 70 in the first position and the protruding piece 603 of the first slider 6 in the temporary fixing position are aligned, and the protruding piece 603 of the first slider 60 fits into the opening 703 of the second slider 70.

[0148] With the first unit 6 attached to the second unit 7 attached to the opening / closing device M, the other end of the wire W3 is connected to the recovery lever 103, and the recovery lever 103 is rotated to set the manual closing device. At this time, the other end of the wire W3 is slightly pulled, and the first slider 60 and the holding means 62 move from the temporary fixing position to the first position. When the first slider 60 moves from the temporary fixing position to the first position, the spacer 75' automatically falls off. Once the installation of the closing device consisting of the first unit 6 and the second unit 7 is complete, the screw 76 is finally removed from the second unit 7, allowing the sliders (second slider 70, third slider 71, first slider 60) in the first position to move in the first direction when the automatic closing mechanism or manual closing mechanism is activated. The closing device 5 according to this embodiment is configured by assembling the first unit 6 and the second unit 7 by stacking them in a direction perpendicular to the sliding direction of the first slider 60, the second slider 70, and the third slider 71, but the screw 76 is a screw that screws forward and backward in a direction different from the stacking direction of the first unit 6 and the second unit 7, and the head 760 is exposed on the outer surface of the second unit 7. Therefore, after the first unit 6 and the second unit 7 are stacked and attached to the opening / closing device M, the head 760 of the screw 76 can be turned to remove the screw 76 from the second unit 7. Furthermore, because the screw 76 is a hexagonal screw, even if the space outside the second side wall 732 of the main body 73 of the second unit 7 attached to the opening / closing device M is narrow, the hexagonal head 760 can be turned in a direction perpendicular to the longitudinal direction of the shaft 761 of the screw 76 to remove the screw 76 from the second side wall 732.

[0149] [Note] In this specification, a first movable body that is movable between a first position and a second position and is biased from the first position toward the second position by a first spring; an automatic closing mechanism that moves the first movable body from the first position to the second position; a second movable body that is movable between a first position and a second position in conjunction with movement of the first movable body; a third movable body that is movable between a first position and a second position, has a second spring between it and the second movable body, and when the second movable body moves from the first position to the second position, moves integrally with the second movable body via the second spring to release the brake of the opening and closing device, and compresses the second spring to move toward the first position independently of the second movable body to release the brake of the opening and closing device; Equipped with a first unit is formed by the first movable body, the first spring, and the automatic closing mechanism; a second unit is formed by the second movable body, the third movable body, and the second spring; The first unit and the second unit are assembled so as to overlap in a direction perpendicular to the moving directions of the first movable body, the second movable body, and the third movable body, A linking means for linking the first movable body and the second movable body is provided. A fire shutter closing device is disclosed. In one aspect, the interlocking means is configured so that a portion of the first movable body and a portion of the second movable body abut against each other, allowing the first movable body and the second movable body to slide integrally from the first position to the second position and from the second position to the first position. In one embodiment, the first movable body includes a protrusion extending toward the second unit, the second movable body has an opening for receiving the protruding piece of the first movable body, and the protruding piece is located within the opening; The interlocking means comprises the protrusion and the edge of the opening. The interlocking means is not limited to a combination of a protrusion on the first movable body and an opening on the second movable body, but may be, for example, a combination of an opening on the first movable body and a protrusion on the second movable body, or a combination of a protrusion or protrusion on the first movable body and a protrusion or convex portion on the second movable body. In one embodiment, the first movable body and the second movable body are slidable integrally from the first position to the second position and from the second position to the first position, A brake return wire is connected to the third movable body, which pulls the third movable body toward the first side when an obstacle is detected, the second spring is a compression spring that compresses when a predetermined first force is applied thereto and maintains its length unchanged when a predetermined second force smaller than the first force is applied thereto; When an obstacle is detected, the third movable body is pulled toward a first side by a first force, thereby compressing the second spring, and the third movable body moves toward the first side independently from the second movable body; When the automatic closing mechanism is activated, the length of the second spring remains unchanged, and the second movable body and the third movable body move together from the first position to the second position. In one embodiment, the first spring is a compression spring, and has a first restoring force from a compressed state in which the first movable body is in a first position, and a first compressive force for starting compression from a state in which the first movable body is in a second position, the first compressive force being smaller than the first restoring force; the second spring is a compression spring, and has a second restoring force from a compressed state in which the third movable body has moved toward the first position, and a second compressive force for starting compression from a state in which the second movable body and the third movable body have moved integrally to the second position, the second compressive force being smaller than the second restoring force; The first compressive force is greater than the second restoring force. In one embodiment, the automatic closing mechanism comprises: a holding means for engaging with the first movable body and holding it at a first position; a solenoid that is activated by energization based on a fire detection signal to release the locked state of the movable body and the holding means in the first position; It is equipped with: In one embodiment, the first movable body includes a surface portion, a first side rising piece, and a second side rising piece, The automatic closing mechanism is located at the center of the width of the face portion, and between the first side rising piece and the second side rising piece, slide shafts are arranged in parallel on both sides of the automatic closing mechanism, and the first springs are two coil springs located on both sides of the automatic closing mechanism and each fitted onto the slide shaft. In one embodiment, a wire constituting a manual closing mechanism that manually moves the first movable body from the first position to the second position is connected to the first unit. In one embodiment, one end of the wire is connected to the holding means, and the other end is provided with a manual operation unit, the wire is maintained in a tensioned state when the first movable body and the holding means are in a locked state at the first position; The manual closing mechanism releases the tension on the wire by a first operation of the manual operating unit while the first movable body is engaged with the holding means, thereby loosening the wire and moving the first movable body and the holding means to a second position. In one embodiment, the holding means comprises a base that is slidable between a first position and a second position and a locking portion that is rotatably provided at the tip of the base, and is provided with a first biasing means that biases the locking portion in a direction that locks it to the movable body, and a second biasing means that biases the holding means from the first position toward the second position in response to the movement of the movable body when the automatic closing mechanism is activated. In one embodiment, the first unit includes a first body incorporating a first movable body, a first spring, and an automatic closing mechanism; the second unit includes a second main body incorporating a second movable body, a third movable body, and a second spring; The first unit and the second unit are assembled by connecting the first body and the second body.

[0150] In this specification, A fire shutter closing device that uses an automatic closing device or a manual closing device to release the brake of the opening / closing machine to allow the shutter curtain to descend under its own weight, and when an obstacle is detected during the descent under its own weight, the brake is released to stop the descent under its own weight. The closing device is equipped with an operating mechanism connected to the manual closing device and the obstacle detection device by wires, and a positioning means for positioning a movable element to which the wire is connected when the wire is fixed to the actuation mechanism during installation. A fire shutter closing device is disclosed. In one embodiment, the positioning means includes a first positioning means; By connecting the wire to the movable element positioned by the first positioning means, the wire is set in the appropriate position. In one embodiment, the movable element is a second slider unit including a second slider that can move in conjunction with the movement of the first slider, a third slider, and a second spring provided between the second slider and the third slider; When the second slider moves in the first direction from the first position to the second position, the third slider moves integrally with the second slider via the second spring to release the brake of the opening and closing machine, and by compressing the second spring, the third slider moves in the second direction toward the first position independently of the second slider to release the brake of the opening and closing machine, A brake return wire can be connected to the third slider, which pulls the third slider in the second direction when an obstacle is detected, By connecting a brake return wire to the third slider of the second slider unit positioned by the first positioning means, the brake return wire is set in an appropriate position. In one embodiment, the first positioning means comprises: a first movement restricting means for positioning the second slider unit at a first position and restricting movement of the second slider unit in a first direction from the first position to the second position; a second movement restricting means for positioning the second slider unit at a first position and restricting movement from the first position in a second direction; It is equipped with: In one embodiment, the positioning means includes a second positioning means; By connecting a wire to the movable element positioned by the second positioning means, the wire is set to a temporary fixing position, and by pulling the wire from the temporary fixing position, the wire is set to an appropriate position. In one embodiment, the movable element is a first slider unit including a first slider biased in a first direction by a first spring; In the event of a fire, the automatic closing device is activated, causing the first slider to move in a first direction from the first position to the second position, A manual closing wire constituting a manual closing device that manually moves the first slider from the first position toward the second position in a first direction can be connected to the first slider unit, the first slider is in a temporarily fixed position with its movement in the first direction restricted by the second positioning means; When the manual closing device is set, the first slider is positioned at the first position by being pulled slightly in the second direction from the temporary fixed position via the manual closing wire, and the manual closing wire is set to the appropriate position. In one embodiment, the slider further includes a linking means for linking the first slider and the second slider, The first positioning means and the second positioning means are positioning means for positioning the interlocking means during construction. [Explanation of symbols]

[0151] 1. Shutter Curtain 5 Closing device 6 Unit 1 60 First slider 61 First coil spring 62 Holding means 63 Solenoid 69 Screws used for attaching wires 69´ Screw used to attach the outer wire 7 Unit 2 70 Second slider 71 Third Slider 72 Second coil spring 75 Spacer (positioning means, movement restriction means) 75' Spacer (positioning means, movement restriction means) 76 Screws (positioning means, movement restriction means) 77 Screws used for attaching wires 78 Screws used to attach outer wires 10 Operation box 102 Emergency closing switch 103 Recovery Lever W1, W2 Brake return wire W3 Wire

Claims

1. A closing device for a fire shutter, comprising a slider unit consisting of a plurality of sliders, in which, in the event of a fire, the slider unit, which is in a first position, moves in a first direction to a second position and releases the brake, a movement restricting means for restricting the slider unit from moving in the first direction to the second position when the closing device is installed; the movement restricting means is movable or detachable from the device, and during installation, is located at a first position on the device and abuts against one of the sliders constituting the slider unit, restricting movement of the one slider in a first direction, thereby restricting movement of the slider unit in the first direction; Fire shutter closing device.

2. 2. The fire shutter closing device according to claim 1, wherein the first position of the one slider is determined by the one slider abutting against the movement restricting means which is in the first position.

3. The slider unit comprises a second slider, a third slider, and a second spring provided between the second slider and the third slider, and the one slider is the second slider; When the second slider moves in a first direction from the first position to the second position, a slider unit including the third slider and the second spring moves together to release the brake of the opening and closing machine, and the third slider compresses the second spring to move in a second direction toward the first position independently of the second slider to release the brake of the opening and closing machine, the movement restricting means restricts movement of the second slider in the first direction by contacting the second slider; A fire shutter closing device according to any one of claims 1 and 2.

4. the movement restricting means is a first movement restricting means that positions the second slider at a first position and restricts movement of the second slider in a first direction from the first position to the second position, a second movement restricting means for restricting movement of the second slider in the second direction when the second slider is at the first position; A fire shutter closing device according to claim 3.

5. the second slider is movable in conjunction with the movement of the first slider biased in a first direction by a first spring; The first slider is configured to move in a first direction from a first position to a second position in response to activation of an automatic closing device in the event of a fire, During construction, the first slider is in a temporary fixed position with its movement in the first direction restricted by the third movement restricting means; The device includes an interlocking means for interlocking the first slider and the second slider, The first movement restricting means, the second movement restricting means, and the third movement restricting means are positioning means for aligning the interlocking means during construction. A fire shutter closing device according to claim 4.

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