Closing device for a fire shutter

Abstract

To set wires for actuating a manual closing device and an obstacle detection device at proper positions, in a closing device for fire shutter.SOLUTION: A closing device for fire shutter includes an actuation mechanism which includes movable elements connected to a manual closing device and an obstacle detection device respectively. By connecting a wire W1 to a movable element (third slider 71) positioned by first positioning means (screw 76, spacer 75), the wire W1 is set to a proper position. By connecting a wire W3 to a movable element (holding means 62) positioned by second positioning means (spacer 75'), the wire W3 is set to a temporary fixing position. By pulling the wire W3 from the temporary fixing position, the wire W3 is set to the proper position.SELECTED DRAWING: Figure 32

Description

Technical Field

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

Background Art

[0002] During a fire, a fire shutter is configured such that an automatic closing mechanism is activated by a signal from a disaster prevention panel to release a brake, and the shutter curtain descends by its own weight to close a building opening. Also, the fire shutter can be made to descend by its own weight at any time by operating a manual closing mechanism regardless of a fire detection signal to release the brake. Further, a mechanical hazard prevention device is provided for the fire shutter to mechanically stop the shutter curtain descending by its own weight in order to prevent a refugee from being pinched by the descending shutter curtain.

[0003] A fire shutter equipped with such a closing device and a mechanical hazard prevention device is disclosed in, for example, Patent Document 1. In the closing device disclosed in Patent Document 1, a first movable part of an automatic closing mechanism and a second movable part of an operating part that releases the brake of an opening / closing machine are connected by a wire. When a fire occurs, the first movable part moves by the operation of the automatic closing mechanism that has received a signal from a disaster prevention panel that has received a fire signal from a sensor, and the second movable part is moved in the brake release direction via the wire, thereby pressing a brake release lever of the opening / closing machine to release the brake and causing the shutter curtain to descend by its own weight. Also, it is possible to cause the shutter curtain to descend by its own weight at any time by a manual operation from the manual closing mechanism. The mechanical hazard prevention device is structured such that when a seat plate at the lower end of the shutter curtain detects a person or an obstacle during descent by its own weight, the second movable part is moved in the brake return direction to return the brake release lever and the brake of the opening / closing machine, temporarily stopping the shutter. After the shutter is temporarily stopped, when the obstacle is removed, the shutter curtain descends again by its own weight to close the opening.

[0004] Such a closing device for a fire shutter is completed through on-site construction using a plurality of components. Specifically, for example, on-site work such as connecting a manual closing wire to a predetermined movable element or connecting a brake return wire to a predetermined movable element is required. When manually closing the shutter curtain, it is necessary to ensure that the shutter curtain starts to descend under its own weight during manual operation. Also, when an obstacle is detected during the self-weight descent of the shutter curtain, it is necessary to reliably stop the shutter curtain descending under its own weight. For this purpose, it is important to connect the manual closing wire and the brake return wire to the movable element at a preset position. [Patent Document 1] Japanese Patent No. 6570986 [Disclosure of the Invention] [Problems to be Solved by the Invention]

[0005] An object of the present invention is to set wires for operating a manual closing device and an obstacle detection device at appropriate positions in a closing device for a fire shutter.

[0006] The technical means adopted by the present invention is as follows. A closing device for a fire shutter that releases the brake of an opener by an automatic closing device or a manual closing device to cause the shutter curtain to descend under its own weight, and restores the brake upon detecting an obstacle during the self-weight descent to stop the self-weight descent, The closing device includes an operating mechanism connected to a manual closing device and an obstacle detection device by wires respectively, and is provided with positioning means for positioning a movable element to which a wire is connected when fixing the wire to the operating mechanism during construction. It is a closing device for a fire shutter.

[0007] In one aspect, the positioning means includes first positioning means. By connecting a wire to a movable element positioned by the first positioning means, the wire is set at an appropriate position.

[0008] In one aspect, the movable element is a second slider unit including a second slider movable in conjunction with the movement of a first slider, a third slider, and a second spring provided between the second slider and the third slider. When the third slider moves in a first direction from a first position to a second position of the second slider, the third slider moves integrally with the second slider via the second spring to release the brake of the opening / closing device, and by compressing the second spring, the third slider moves in a second direction toward the first position independently of the second slider to return the brake of the opening / closing device. A wire for brake return that pulls the third slider in the second direction when an obstacle is detected can be connected to the third slider. By connecting a wire for brake return to the third slider of the second slider unit positioned by the first positioning means, the wire for brake return is set at an appropriate position.

[0009] In one aspect, the first positioning means includes a first movement restricting means for positioning the second slider unit at a first position and restricting movement in a first direction from the first position to the second position, and a second movement restricting means for positioning the second slider unit at a first position and restricting movement in a second direction from the first position. It is provided with. In one aspect, the first movement restricting means is a screw movable in the moving direction of the second slider unit, and the second movement restricting means is a spacer. In one aspect, a second unit (constituting a second operating mechanism) is formed from a second slider, a third slider, a second spring, a slide shaft, and a second main body in which these are incorporated. In one aspect, the screw is provided on one side wall of the second main body, and the tip of the shaft portion can abut against the second slider unit (second slider). In one aspect, the spacer is provided between the second slider unit (third slider) and the other side wall of the second body. In one aspect, the second movement restricting means (spacer) is removed after the connection of the brake return wire. In one aspect, the first movement restricting means (screw) is removed after the attachment of the second unit.

[0010] In one aspect, the positioning means includes second positioning means. By connecting a wire to the movable element positioned by the second positioning means, the wire is set at a temporary fixing position, and by pulling the wire from the temporary fixing position, the wire is set at an appropriate position.

[0011] In one aspect, the movable element is a first slider unit including a first slider biased in a first direction by a first spring. In case of fire, due to the operation of the automatic closing device, the first slider moves in the first direction from the first position to the second position. A manual closing wire for constituting a manual closing device for manually moving the first slider in the first direction from the first position to the second position 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. The first slider is positioned at the first position by being slightly pulled in the second direction from the temporarily fixed position via the manual closing wire when the manual closing device is set, and the manual closing wire is set at an appropriate position. In one aspect, the automatic closing device Holding means for engaging with the first slider and holding it in the first position. A solenoid that operates by energization based on a fire detection signal and releases the locking state between the movable body at the first position and the holding means. And is provided with The first slider unit includes the first slider and the holding means (in a locked state with respect to the first slider). One end of the manual closing wire is connected to the holding means, and a manual operation part is provided on the other end side. In one aspect, the second positioning means is a spacer. In one aspect, the second positioning means (spacer) is automatically removed when the manual closing device is set. In one aspect, a first unit (constituting a first operating mechanism) is formed from the first slider, the first spring, the slide shaft, the automatic closing device (including the holding means), and the first main body in which these are incorporated. In one aspect, the spacer is provided between the first slider and one side wall of the first main body.

[0012] In one aspect, interlocking means for interlocking the first slider and the second slider is provided. The first positioning means and the second positioning means are alignment means for aligning the interlocking means during construction. In one aspect, a portion of the second slider positioned at the first position by the first positioning means and a portion of the first slider positioned at the temporary fixing position by the second positioning means are aligned by the alignment means. In one aspect, when the first main body of the first unit including the first slider and the second main body of the second unit including the second slider are connected, the interlocking means is automatically aligned by the alignment means. In one aspect, the first slider includes a protruding piece. The second slider includes an opening for receiving the protruding piece of the first slider, and the protruding piece is positioned within the opening. The interlocking means is composed of the protruding piece and the edge of the opening.

Advantages of the Invention

[0013] According to the present invention, in the closing device of a fire shutter, it becomes possible to set a wire for operating a manual closing device or an obstacle detection device at an appropriate position.

Brief Description of the Drawings

[0014]

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Embodiments for Carrying out the Invention

[0015] [A] Overall Configuration of a Shutter with a Mechanical Hazard Prevention Device The overall configuration of the shutter with a mechanical hazard prevention device according to this embodiment will be described. As shown in FIGS. 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) provided above the opening. Guide rails 2 are erected at both the left and right ends of the opening. The shutter curtain 1 is configured by connecting a plurality of long slats extending in the opening width direction vertically. A seat plate 3 is provided at the lower end. In the fully open state of the opening, the shutter curtain 1 is wound around the winding shaft. By rotating the winding shaft from this state, the shutter curtain 1 descends while the left and right ends in the width direction are guided by the guide rails 2, and when the seat plate 3 at the lower end of the shutter curtain 1 touches down, the opening is fully closed. The seat plate 3 consists of a long upper seat plate 30 extending in the opening width direction and a long lower seat plate 31 suspended below the upper seat plate 30 so as to be vertically movable relative to the upper seat plate 30. The seat plate 3 is a component of an obstacle detection means that detects an obstacle when the shutter curtain 1 that descends under its own weight or by electric power hits an obstacle.

[0016] The take-up shaft is transmission-connected to the output shaft of the opening / closing machine M. In the fully open state of the opening, the rotation of the take-up shaft is restricted by the brake of the opening / closing machine M, thereby maintaining the fully open state of the opening. As shown in FIG. 3 and the like, a brake release lever ML protrudes from the brake case of the opening / closing machine M. By moving the brake release lever ML in the brake release direction, the brake that restricts the rotation of the output shaft and the take-up shaft of the opening / closing machine M is released. In a specific embodiment example, the brake means has a brake plate that is capable of approaching and separating from the opening / closing machine output shaft or a rotating member that rotates integrally with this output shaft. In the fully open state of the opening, the brake plate is pressed by a biasing means such as a spring, and the brake is in operation to restrict the rotation of the take-up shaft. In this state, by swinging the brake release lever against the spring, the brake plate is separated and the brake is released, enabling the rotation of the take-up shaft and causing the shutter curtain to descend by its own weight. Also, if the brake release lever is left free, the brake plate is pressed by the spring, which is the biasing means, and the brake and the brake release lever automatically return. That is, the brake of the opening / closing machine M is forcibly released by the movement of the brake release lever, and returns by the biasing means when the force applied by the brake release lever is released.

[0017] The shutter device is provided with a closing device 5 for causing the shutter curtain 1 in the fully open state at the time of a fire to descend by its own weight. In FIGS. 1 and 2, the closing device 5 is attached adjacent to the lower side of the opening / closing machine M, and in FIG. 3, the closing device 5 is attached adjacent to the upper side of the opening / closing machine M. However, the attachment position and attachment posture of the closing device 5 can be appropriately selected according to the attachment posture of the opening / closing machine M and the type of the opening / closing machine M.

[0018] The closing device 5 operates based on the input of a fire detection signal to release the brake of the switch M, allowing the shutter curtain 1 to descend by its own weight to fully close the opening and form a fire compartment. When a fire occurs in the fully open state of the opening, the fire detector 4a senses the fire, and the automatic closing mechanism of the closing device 5 is activated by energization based on the fire detection signal from the disaster prevention panel 4b. The brake of the switch M is released in conjunction with the operation of the automatic closing mechanism, causing the shutter curtain 1 to descend by its own weight. Additionally, the shutter device is equipped with a manual closing mechanism or device that enables the shutter curtain 1 to be manually lowered by its own weight at any time, separate from the input of the fire detection signal.

[0019] The closing device 5 according to this embodiment is an integrated type assembled from the first unit 6 and the second unit 7. By being attached adjacent to the switch M, it is configured to actuate the braking force on the brake release lever ML without using a wire. The first unit 6 constitutes the automatic closing mechanism and the manual closing mechanism, and the second unit 7 constitutes a brake release and return mechanism that releases the brake release lever of the switch 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 hazard prevention device. When the seat plate 3 at the lower end of the shutter curtain 1 during its self-weight descent hits an obstacle and detects the obstacle, the brake of the opening and closing machine M is restored via a brake return wire, and the self-weight descent of the shutter curtain 1 is stopped. The brake return wire is composed of a wire W1 and a wire W2. In the upper part above the opening, a relay device 8 is provided closer to the side where the opening and closing machine M in the opening width direction is installed. On the seat plate 3, a locking device 9 is provided closer to one side in the opening width direction so as to be located below the relay device 8. The locking device 9 includes a locking drum located substantially directly below the relay device 8, a winding drum adjacent to the locking drum, and a locking mechanism for locking the rotation of the locking drum when an obstacle is detected. As an example, the obstacle detection means uses a detection lever rotatably provided between the upper seat plate 30 and the lower seat plate 31 constituting the seat plate 3. The wire W1 and the 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 the locking drum of the locking device 9 provided on the seat plate 3 and is connected to be wound around the winding drum via the locking drum so as to be windable. The wire W2 is drawn out so as to extend along the surface of the shutter curtain 1 as the shutter curtain 1 descends. The locking device 9 is provided on the upper seat plate 30. When the lower seat plate 31 of the shutter curtain 1 during descent hits an obstacle and moves upward relative to the upper seat plate 30, the drawing out of the brake return wire (wire W1 + wire W2) is mechanically restricted, and when the brake return wire (wire W1 + wire W2) whose drawing out is restricted is pulled, the return mechanism of the brake release / return mechanism is activated.

[0021] When the lower seat plate 31 of the shutter curtain 1 during self-weight descent hits an obstacle, the brake return wire (wire W1 + wire W2) is pulled, causing the brake return mechanism to operate. As a result, the brake returns, restricting the rotation of the winding shaft and mechanically stopping the self-weight descent of the shutter curtain 1. When the obstacle is removed, the brake return wire (wire W1 + wire W2) can be pulled out, and the brake release mechanism of the brake release and return mechanism operates, allowing the shutter curtain 1 to resume self-weight descent. Also, after the obstacle is removed, the timing of the shutter curtain 1 to resume descent under its own weight is delayed. For detailed specific examples of the configurations of the relay device 8, the lock device 9, the obstacle detection means, and the delay means for resuming self-weight descent after the obstacle is removed, reference can be made to, for example, Patent Document 1.

[0022] As shown in FIGS. 1 and 2, an operation box 10 is provided on the wall surface near the shutter device at a height that is easy to operate. As shown in FIG. 4, the operation box 10 is a vertically long rectangular parallelepiped box body. A lid 100 is provided on the front surface so as to be openable and closable, and is equipped with a cylinder lock for maintaining the closed state of the lid 100. The lid 100 has a keyhole 1000 for inserting a key for locking and unlocking the cylinder lock. The operation box 10 has a function as a switch box, and an opening and closing operation switch 101 composed of an open switch U, a closed switch D, and a stop switch S is arranged inside. As shown in FIG. 1, the opening and closing operation switch 101 is electrically connected to a control unit (obstacle detection control panel 11A, shutter control panel 11B). In the case of a manual shutter device, the operation box 10 may not be provided with an opening and closing operation function (opening and closing operation switch 101).

[0023] The operation box 10 according to this embodiment includes, in addition to the opening / closing operation function using the opening / closing operation switch 101, a manual closing function using the emergency closing switch 102, an automatic closing mechanism using the recovery lever 103, and a recovery function for the manual closing mechanism. One end of the 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 fixing means or locking means. On the lid 100 of the operation box 10, the pressing part 102' of the emergency operation switch 102 is displayed. When the lid 100 is closed, by pressing the pressing part 102', the emergency operation switch 102 is activated to release the fixing means or locking means of the wire W3, relieve the tensioned state, and loosen the wire W3. In conjunction with loosening the wire 3, the manual closing mechanism is activated.

[0024] As shown in FIGS. 4 and 5, a recovery lever 103 is provided adjacent to the lid 100 on the front surface of the operation box 10. The recovery lever 103 is normally housed flush with the front surface of the operation box 10 and projects from the housed position to the projecting position (indicated by 103') in conjunction with the pressing operation of the emergency operation switch 102. By rotating the projecting recovery lever 103' downward (indicated by 103''), the loosened wire W3 is pulled to a tensioned state, the other end side of the wire W3 is locked, and the wire W3 maintains the tensioned state. Then, it is returned to the housed position and set to the initial position. The emergency closing switch 102 and the recovery lever 103 of the operation box 10 constitute a manual operation part, and a first operation (manual closing operation) by pressing the emergency closing switch 102 and a second operation (recovery operation) by rotating the recovery lever 103 are executed. Details of the manual closing function, the automatic closing mechanism, and the recovery function of the manual closing mechanism will be described later.

[0025] As aspects of the shutter with a mechanical hazard prevention device according to this embodiment, there can be an aspect of using it as a so-called combined management shutter, or an aspect of using it as a fire shutter that is normally in an open state of the opening and forms a fire compartment by allowing the shutter curtain 1 to fall by its own weight during a fire. In the case of a combined management shutter, normally, the shutter curtain 1 is electrically lifted and lowered to open and close the opening by driving the winding shaft forward and backward by the opening and closing machine M according to an operation from the opening and closing operation switch 101 of the operation box 10, and during a fire, it operates as a fire shutter that allows the shutter curtain 1 to fall by its own weight. When used as a combined management shutter, the control unit of the shutter device according to this embodiment is configured to execute different controls in the electric opening and closing mode (normal mode) and the self-weight lowering mode (fire mode).

[0026] The control unit according to this embodiment consists of an obstacle detection control panel 11A and a shutter control panel 11B. As shown in FIG. 1, in this embodiment, 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 opening and closing operation switch 101 in the operation box 10 and the obstacle detection control panel 11A are electrically connected. During electric lifting and lowering, the opening signal, closing signal, and stop signal based on the input from the opening and closing operation switch 101 are transmitted to the shutter control panel 11B via the obstacle detection control panel 11A. In the illustrated aspect, 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 the obstacle detection control panel 11A and the shutter control panel 11B.

[0027] In the combined management shutter according to this embodiment, even when the seat plate 3 at the lower end of the shutter curtain 1 during electric lowering hits an obstacle, the movement of the movable part (the third slider 71) of the brake release / return mechanism by the brake return wire (wire W1 + wire W2) is detected, and the shutter curtain 1 during electric lowering is stopped. That is, regardless of whether it is electric lowering or self-weight lowering, the stop of the descent of the shutter curtain 1 when the closing shutter curtain 1 hits an obstacle is performed via the brake release / return mechanism. More specifically, in the case of electric lowering, the opening / closing machine M is stopped by the operation of the second microswitch SW2 (see FIG. 21) that detects the movement of the movable part (the third slider 71), and in the case of self-weight lowering, the shutter curtain 1 during descent stops due to the mechanical return of the brake release lever ML accompanying the movement of the movable part (the third slider 71).

[0028] [B]Closing device As shown in FIGS. 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 a part of 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 machine 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. Hereinafter, the configuration of the closing device 5 will be described in detail.

[0029] [B-1]First unit 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 biases the first slider 60 from the first position toward the second position, and an automatic closing mechanism that slides the first slider 60 in the first position to the second position in response to the input of a fire detection signal. In the description of the first unit 6, the side closer to the first position is the first side, and the side closer to the second position is the second side. Also, note that the "rising piece" used as the name of a part of the member can be, for example, a piece extending downward or a piece extending horizontally depending on the posture of the member.

[0030] The automatic locking mechanism includes a holding means 62 that locks onto a first slider 60 in a first position and holds the first slider 60 in the first position, and a solenoid 63 that operates by energization based on the input of a fire detection signal from the disaster prevention panel 4b to release the locked state between the first slider 60 in the first position and the holding means 62. The holding means 62 consists of a base 620 that is slidable between a first position and a second position, and a latch portion or locking portion 621 rotatably provided at the tip of the base, and the locking portion 621 can be locked onto the first slider 60.

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

[0032] The first unit 6 is provided with a detection means (microswitch SW) for detecting that the automatic locking mechanism has been actuated. When the microswitch SW detects that the first slider 60 has moved from the first position to the second position due to the actuation of the automatic locking mechanism, a detection signal is transmitted to the disaster prevention panel 4b, and in response to the detection by the microswitch SW, the energization of the solenoid 63 based on the fire detection signal from the disaster prevention panel 4b is cut off.

[0033] The first unit 6 has a main body or frame 64 including a plate-shaped bottom wall 640, a first side wall 641 and a second side wall 642 that rise up oppositely from the first side and the second side of the bottom wall. A pair of slide shafts 65 are provided in parallel so as to bridge between the first side wall 641 and the second side wall 642. The first slider 60 is slidable between a first position and a second position along the slide shaft 65, and a first coil spring 61 is externally mounted on the slide shaft 65. On the bottom wall 640 of the main body 64, an L-shaped member is fixed at a position closer to the first side, and a contact rising piece 643 is provided from the rising part of the member. The slide shaft 65 is inserted through the contact rising piece 643.

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

[0035] As shown in FIG. 9, the first slider 60 has a plate-shaped surface portion 600 extending parallel to the bottom wall 640 of the main body 64, a first rising piece 601 and a second rising piece 602 that rise vertically oppositely from the first side and the second side of the surface portion 600, and has a substantially U-shaped cross section in side view. Holes 6010 and 6020 for inserting the slide shaft 65 are formed in the first rising piece 601 and the second rising piece 602. In the first slider 60 according to the present embodiment, the rising pieces 601 and 602 are a pair of rising pieces 601, 601; 602, 602 that rise from both sides in the width direction of the surface portion 600, respectively. An opening 6000 is formed at a substantially central portion 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, on the bottom wall 640 of the main body 64, a contact rising piece 643 is provided at a position closer to the first side. One end of the first coil spring 61 fitted around the slide shaft 65 abuts against the contact rising piece 643 at the end on the first side, and the other end on the second side abuts against the second rising piece 602 of the first slider 60. When the first slider 60 is in the first position, the distance between the second rising piece 602 of the first slider 60 and the contact rising 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 can be clearly seen, 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] On the outer surface on the second side of the surface portion 600 of the first slider 60, a projection piece 603 is provided as an element of an interlocking means or a transmission means for transmitting the sliding movement of the first slider 60 to the second slider 70. In the present embodiment, the projection piece 603 is a portion of an L-shaped arm in side view. The arm is composed of a base 604, a projection piece 603 rising from the base 604, and a tongue-shaped projection piece 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 surface portion 600 of the first slider 60 with screws (welding may also be used). The projection piece 603 passes through an opening 6400 formed in the bottom wall 640 of the main body 64, and when the first slider 60 slides between the first position and the second position, the projection piece 603 moves within the opening 6400.

[0038] When the first slider 60 moves to the second position, the protruding piece 605 protrudes from the opening 6420 formed in the second side wall 642 of the main body 64 (see Fig. 16). The closing device 5 according to the present 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 protruding piece 603 (reciprocating in a direction perpendicular to the protruding direction of the protruding piece 603) and the displacement of the protruding piece 605 (reciprocating along the protruding direction of the protruding piece 605) when the first slider 60 slides, it is possible to use the first unit 6 alone as a closing device for a shutter installed in an opening where a hazard prevention mechanism is not required. More specifically, the first unit 6 alone is attached in a posture and position where one of the protruding pieces 603 and 605 selected can press the brake release lever in the brake release direction against the opening and closing mechanism of the closing device without a hazard prevention mechanism. By the operation of the automatic closing mechanism or the manual closing mechanism, the selected protruding piece presses the brake release lever in the brake release direction to release the brake and allow the shutter curtain to drop by its own weight.

[0039] As shown in Fig. 9, on the inner surface of the second side of the surface portion 600 of the first slider 60, a portion to be locked 606 where the locking portion 621 of the holding means 62 locks is protruded adjacent to the edge portion of the second side of the opening 6000 formed in the surface portion 600. The portion to be locked 606 according to the present embodiment has a U-shape from a pair of side pieces 6060 and a bottom piece 6061, and the bottom piece 6061 is fixed to the surface portion 600 in a posture rising from the surface portion 600.

[0040] The holding means 62 includes a rotatable locking portion 621 that locks to the portion to be locked 606 of the first slider 60, and is also slidable between the first position and the second position. The holding means 62 includes a first biasing means (coil spring 66) that biases the locking portion 621 in a direction to lock to the portion to be locked 606 of the first slider 60, and a second biasing means (coil spring 67) that biases the holding means 62 with a force to move 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 operates.

[0041] The base 620 of the holding means 62 is positioned between the face 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 moving direction, and side pieces 6201 at both ends in the width direction of the bottom surface 6200. The 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. On the base end side (first side) of the bottom surface 6200, a wide extending surface 6200' is integrally formed beyond the base ends of the side pieces 6201, and a rising piece 6203 is formed from the base end of the extending surface 6200'.

[0042] Two elongated holes 6204 and 6205 extending in the length direction (moving direction) are formed in the bottom surface 6200. On the upper surface of the bottom surface 6200, a rectangular guide plate 622 extending in the moving direction is positioned. The guide plate 622 is connected to the bottom wall 640 (not shown in FIG. 10) of the main body 64 by using two screws 623 and 624 at two positions in the length direction. The shaft portions of the respective screws 623 and 624 are inserted through the respective elongated holes 6204 and 6205. The base 620 of the holding means 62 is positioned 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 the first side of the elongated hole 6205, and one end of the wire W3 is fixed to the edge portion on the first side of the opening 6206.

[0043] The locking portion 621 of the holding means 62 includes a pair of side pieces 6210 having a substantially triangular shape in side view with a first corner, a second corner, and a third corner. A pair of locking rollers 6211 are provided on a shaft portion provided between the first corners of the side pieces 6210. With a shaft portion 6212 provided between the second corners of the side pieces 6210 as a rotation fulcrum, it is rotatably connected to a rising piece 6202 at the tip of the base 620. A connecting piece 625 is connected to a shaft portion 6213 provided between the third corners of the side pieces 6210, and the tip of the shaft portion 630 of the solenoid 63 is connected to the connecting piece 625. The holding means 62 is positioned between the surface portion 600 of the first slider 60 and the bottom wall 640 of the main body 64, and the locking means 621 is positioned in the opening 6000 of the surface portion 600 of the first slider 60 and is located above the locked portion 606 fixed to the surface portion 600 (in the illustrated posture). In the locked posture, the first corner of the side piece 6210 of the locking portion 621 is located on the second side rather than the second corner, and the first corner and the second corner are located at substantially the same height with respect to the surface portion 600 (the side connecting the first corner and the second corner is substantially parallel to the surface portion 600). The third corner is located at a position more spaced apart from the surface portion 600 (higher in the illustrated posture), the first corner is located on the second side rather than the third corner, and the third corner is located slightly on the second side rather than the second corner. The locking portion 621 is biased to rotate in a direction in which the locking state is released when the third corner moves to the first side (the right side in the figure), and is biased to maintain the locked posture by biasing the third corner toward the second side (the left side in the figure).

[0044] As shown in FIG. 10, the connecting piece 625 includes a first portion to which the shaft portion 6213 is attached and a second portion located on the first side of the first portion and extending in the height direction. The connecting piece 625 is formed with a first hole 6250 on the side close to the shaft portion 6213 and a second hole 6251 on the side away from the shaft portion 6213. The angle between the line connecting the center of the shaft portion 6213 (the mounting hole of the shaft portion 6213) and the center of the first hole 6250 and the line connecting the center of the first hole 6250 and the center of the second hole 6251 is a right angle. The connecting piece 625 is attached in a posture where the shaft portion 6213 and the first hole 6250 are located at substantially the same height with respect to the surface portion 600.

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

[0046] One end of the 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 the locking hole 6421 of the second side wall 642 of the main body 64. The coil spring 66 according to the present 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 for biasing 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 rotation fulcrum) to maintain the posture 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 at a distance from the shaft portion 6212 which is the rotation fulcrum of the locking portion 621. By biasing the locking portion 621 in the direction of pulling it to the second side through the connecting piece 625, the coil spring 66 biases the locking roller 6211 of the locking portion 621 downward, and the locking posture of the locking roller 6211 of the locking portion 621 with respect to the locked portion 606 of the first slider 60 is maintained.

[0047] When the solenoid 63 is activated by instantaneous energization, against the biasing force of the coil spring 66, after the locking portion 621 rotates in the direction to release the locked state (after the power supply is cut off), the coil spring 66 causes the locking portion 621 to rotate so as to return to the locked position. In the present embodiment, the locking roller 6211 of the locking portion 621 that rotates so as to return to the locked position comes into contact with the locked portion 606 in a state of being placed thereon, and after the automatic closing mechanism is actuated, the locked portion 606 does not completely return to the locked position (see FIG. 16).

[0048] The first biasing means may be a torsion spring provided at the rotation base end portion of the locking portion 621 so as to bias the locking portion 621 in the locking direction. However, the coil spring 66 according to the present embodiment is advantageous in that it has an effect of stabilizing the locked position of the locking portion 621 when the holding means 62 slides. This will be described in the section on the restoration of the actuated closing device 5.

[0049] In the present embodiment, the locking roller 6211 of the locking portion 621 of the holding means 62 is in point contact with the locked portion 606 to reduce the contact resistance in the locked state. In the event of a fire, which is an emergency, in order to more reliably release the brake of the opening / closing machine M and allow the shutter curtain 1 to descend by its own weight to form a fire compartment, it is desirable to press the brake release lever with a greater actuating force, and this actuating force can be increased by increasing the spring force of the spring (the spring force of the first coil spring 61 in the present embodiment) for actuating the closing device. At this time, the contact resistance acting on the locking portion, that is, the latch portion, also increases (if the latch does not disengage, the automatic closing mechanism does not operate). However, in the present embodiment, the locking roller 6211 is in point contact with the side piece 6060 of the locked portion 606 to reduce the contact resistance in the locked state, and in cooperation with the fact that the locking roller 6211 is rotatable, while the first coil spring 61 increases the spring force, the locked state smoothly disengages during a fire so that the automatic closing mechanism can exert a greater actuating force.

[0050] A rising piece 6203 is formed at the proximal end portion (the end portion on the first side) of the base 620 of the holding means 62, and a coil spring 67 as a second biasing means is provided between the locking hole 6001 formed at the first side portion of the surface portion 600 of the first slider 60 and the rising piece 6203. In the present embodiment, in the first unit 6, the surface portion 600 of the first slider 60 and the upper portion of the rising piece 6203 of the holding means 62 are at substantially the same height position, and the coil spring 67 extends in the sliding movement direction of the first slider 60 and the holding means 62 and expands and contracts in the sliding movement direction.

[0051] The coil spring 67 is a tension spring. As the first slider 60 moves from the first position to the second position with respect to the holding means 62 (maintaining the first position), the coil spring 67 is tensioned, and a force acting to return to the original length accumulates as a biasing force for moving the holding means 62 from the first position to the second position. That is, when the locking state between the holding means 62 held in the first position and the first slider 60 is released by the operation of the automatic closing mechanism, the first slider 60 slides from the first position to the second position with respect to the holding means 62 maintaining the first position. At this time, a biasing force for moving the holding means 62 from the first position to the second position is accumulated by the coil spring 67 functioning as the second biasing means.

[0052] When the automatic closing mechanism operates, the energization of the solenoid 63 releases the locking state between the holding means 62 and the first slider 60. By the biasing force of the first coil spring 61, only the first slider 60 slides from the first position to the second position, while the wire W3 is in a tensioned state and the holding means 62 is maintained in the first position. At this time, a biasing force for moving the holding means 62 from the first position to the second position is accumulated in the tensioned coil spring 67.

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

[0054] The manual closing mechanism is configured such that, with the first slider 60 locked to the holding means 62, by the first operation of the manual operation part (that is, the pressing operation of the emergency closing switch 102 of the operation box 10), the fixing means of the other end side of the wire W3 in a tensioned state is released, the wire W3 is loosened, and by the biasing force of the first coil spring 61, the first slider 60 and the holding means 62 in the first position are moved to the second position while maintaining the locked state.

[0055] [B-2] Second unit As shown in FIG. 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, slides integrally with the second slider 70 from the first position to the second position, and is slidable independently of 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 third 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 / closing machine, and by compressing the second coil spring 72, it can move to the first position independently of the second slider 70 to restore the brake of the opening / closing machine. In the description of the second unit 7, the side closer to the first position is the first side, and the side closer to the second position is the second side. Also, it should be noted that the "rising piece" used as the name of a part of the member can be, for example, a piece extending downward or a piece extending horizontally depending on the posture 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 side of the wire W1 is connected to the relay device 8 of the mechanical hazard prevention device. When an obstacle is detected during free fall, the brake return wire (wire W1 + wire W2) is pulled, so that the third slider 71 at the second position slides toward the first side toward the first position independently of the second slider 70 while compressing the second coil spring 72 to restore the brake. When an obstacle is detected, the third slider 71 can move beyond the normal position (the first position) to 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 to the second side, and the third position (obstacle detection position) moved from the normal position to 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 that rise oppositely from the first side and the second side of the bottom wall 730. A pair of second slide shafts 74 are provided in parallel so as to span between the first side wall 731 and the second side wall 732. The second slider 70 and the third slider 71 are slidable between a first position and a second position along the second slide shaft 74, and a second coil spring 72 is externally mounted on the slide shaft 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 central portion of the bottom wall 730 to the second side. Left and right bending pieces 7310 are formed on both sides in the width direction of the first side wall 731, and one end side of the outer wire W1' is inserted and fixed between a pair of central bending pieces 7311 formed between the left and right bending pieces 7310. Left and right bending pieces 7320 are formed on both sides in the width direction of the second side wall 732.

[0059] As shown in FIG. 13, the second slider 70 has a plate-shaped surface portion 700 extending parallel to the bottom wall 730 of the main body 73, and a first rising piece 701 and a second rising piece 702 that rise vertically oppositely from the first side and the second side of the surface portion 700, and has a substantially U-shaped cross section in side view. Holes 7010 and 7020 for inserting the slide shaft 74 are formed in the first rising piece 701 and the second rising piece 702.

[0060] In this embodiment, the face portion 700 of the second slider 70 is located on the side closer to the first unit 6. An opening 703 for receiving the protruding piece 603 of the first slider 60 is formed in the face portion 700. When the protruding piece 603 of the first slider 60 abuts against 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 end portion on the second side of the face portion 700 is a protruding portion that protrudes to the second side from the second rising piece 702, and the opening 703 is formed at the base end portion of the protruding portion. Further, an opening 7000 is formed in the face portion 700 extending from the central portion to the base end side portion of the first rising piece 701, and the base end side portion of the first rising piece 701 has a concave edge.

[0061] As shown in FIG. 14, the third slider 71 includes a plate-shaped face portion 710 extending parallel to the bottom wall 730 of the main body 73, and first and second rising pieces 711 and 712 that vertically rise oppositely from the first and second sides of the face portion, and has a substantially U-shaped cross section in side view. Holes 7110 and 7120 for inserting the slide shaft 74 are formed in the first and second rising pieces 711 and 712. The edge on the second side of the face portion 710 is a concave edge, and a pressing piece 713 that protrudes in a curved shape with respect to the face portion 710 is integrally formed at the central portion in the width direction. The pressing piece 713 of the third slider 71 is located in the opening 7300 of the bottom wall 730 of the main body 73 of the second unit 7. A pair of bent pieces 714 are formed at the central portion in the width direction of the first rising piece 711, and the wire W1 is inserted and fixed between the bent pieces 714.

[0062] In this embodiment, the surface portion 710 of the third slider 71 is located on the side closer to the case of the opening / closing machine M, and the tip of the brake release lever ML of the opening / closing machine M extends from the opening 7300 of the bottom wall 730 of the main body 73 into the second unit 7. By the operation of the closing device, when the third slider 71 slides from the first position to the second position, the pressing piece 713 protruded on the surface portion 710 presses the brake release lever ML in the brake release direction to release the brake.

[0063] As shown in FIG. 11, the second slider 70 and the third slider 71 face each other with the surface portions 700 and 710 spaced apart. The second rising piece 702 of the second slider 70 is located closer to the second side wall 732 than the second rising piece 712 of the third slider 71. The second rising piece 712 of the third slider 71 abuts against the inside of the second rising piece 702 of the second slider 70. The first rising piece 711 of the third slider 71 is located closer to the first side wall 731 than the first rising piece 701 of the second slider 70. The first rising piece 701 of the second slider 70 abuts against the inside of the first rising piece 711 of the third slider 71 and is incorporated into the second slide shaft 74. The end portion on the first side of the second coil spring 72 externally mounted on the second slide shaft 74 abuts against the inside of the first rising piece 701 of the second slider 70, and the end portion on the second side abuts against the inside of the second rising 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 pushes the end portion on the first side of the second coil spring 72 to the second side. As a result, the second rising piece 712 of the third slider 71 is pressed to the second side by the end portion on the first side of the second coil spring 72. The second slider 70, the second coil spring 72, and the third slider 71 slide together to the second position. The pressing piece 713 of the third slider 71 presses the brake release lever ML to release the brake, and the shutter curtain 1 descends by its own weight.

[0065] When the shutter curtain 1 during self-weight descent hits an obstacle and obstacle detection is performed, 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 so as to move from the second position to the first position. The third slider 71 compresses the second coil spring 72 while the second rising piece 712 of the third slider 71 (at this time, a biasing force toward the second side is stored in the third slider 71), and independently of the second slider 70 (maintaining the second position), it slides to the first side toward the first position. The pressing of the brake release lever ML by the pressing piece 713 of the third slider 71 is released, the brake returns, and the shutter curtain 1 during self-weight descent stops.

[0066] After the shutter curtain 1 stops descending based on obstacle detection, when the obstacle is removed, the tension state of the brake return wire (wire W1 + wire W2) is released, the brake return wire (wire W1 + wire W2) loosens, and the biasing force of the compressed second coil spring 72 causes the third slider 71 to slide to the second side toward the second position. The pressing piece 713 of the third slider 71 presses the brake release lever ML to release the brake again, and the shutter curtain 1 is allowed to descend under its own weight again.

[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 that the automatic closing mechanism or the manual closing mechanism has operated. In the present embodiment, the first microswitch SW1 is located in the movement path of the second slider 70 so as to detect that the second slider 70 of the second unit 7 has moved from the first position to the second position in conjunction with the operation of the automatic closing mechanism or the manual closing mechanism, and is provided at a fixed part (a predetermined part of the main body 73) of the second unit 7. By detecting the first microswitch SW1, the electric opening and closing mode and the self-weight lowering mode can be identified. In conjunction with the operation of the automatic closing mechanism or the manual closing mechanism, when the second slider 70 slides from the first position to the second position, the self-weight lowering mode is entered and the electric operation is prohibited. In one aspect, the first microswitch SW1 has contacts that are ON during monitoring and OFF during operation. When the first microswitch SW1 changes from ON to OFF, an operation confirmation signal is input to the obstacle detection control panel 11A. When the shutter curtain 1 is being opened and closed electrically, the driving of the opening and closing machine M is stopped via the shutter control panel 11B, and the pressing operation of the opening and closing operation switch 101 is disabled, and the self-weight lowering starts promptly. That is, when the first microswitch SW1 is ON, it is in the electric opening and closing mode, and when the first microswitch SW1 is OFF, it is in the self-weight lowering mode. In the present embodiment, the first microswitch SW1 operates when it changes from ON to OFF, but those skilled in the art will understand that it can be designed to operate when it changes from OFF to ON.

[0068] The second microswitch SW2 is a detection means for detecting that an obstacle has been detected during the electric lowering of the shutter curtain 1. In the present embodiment, the second microswitch SW2 is provided at a predetermined position on the moving path of the third slider 71 so as to detect that the third slider 71 in the stationary position has moved to the first side, at a predetermined position on the stationary part (a predetermined part of the main body 73) of the second unit 7. The second microswitch SW2 operates when an obstacle is detected. In one aspect, the contacts are OFF during monitoring (during normal shutter opening and closing), and the contacts become ON when the microswitch operates. That is, it is assumed that an obstacle has been detected when the second microswitch SW2 changes from OFF to ON during the electric lowering of the shutter curtain 1. When the second microswitch SW2 changes from OFF to ON during the electric lowering of the shutter curtain 1, an obstacle detection signal is input to the obstacle detection control panel 11A, and the electric lowering of the opening / closing machine M is stopped via the shutter control panel 11B. In the present embodiment, the first microswitch SW1 operates by changing from OFF to ON, but those skilled in the art will understand that it can be designed to operate by changing from ON to OFF.

[0069] [B-3] Assembly of the closing device The closing device 5 is configured by assembling the first unit 6 and the second unit 7 so as to overlap in a direction orthogonal to the sliding direction of the first slider 60, the second slider 70, and the third slider 71. Also, as shown in FIG. 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 machine M. The main body 64 of the first unit 6 incorporates the first slider 60, the first coil spring 61, the holding 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 as to overlap.

[0070] On the outer surface of the first side wall 641 of the main body 64 of the first unit 6, an L-shaped mounting piece 68 in side view, composed of a first part 680 and a second part 681, is fixed via the second part 681, and the first part 680 extends 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 part 680 of the mounting piece 68 and connecting them with screws, and 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). In the state where the first unit 6 and the second unit 7 are assembled, the side surface and the upper surface of the first unit 6 (in the posture shown in the lower figure of Fig. 6) are open. A cover (not shown) having a U-shaped cross section may be attached to cover the open portions on three sides of the 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 close to the bottom wall 640 of the main body 64. In the second unit 7, the face portion 700 of the second slider 70 faces the bottom wall 640 on the side far from the bottom wall 730 of the main body 73 (the side close to the bottom wall 640). The protruding piece 603 of the first slider 60 protrudes into the main body 73 of the second unit 7 from the opening 6400 of 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 can slide 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 the compressed state (when the first slider 60 is in the first position, that is, the steady state), and a first compression force for starting compression from the length when the closing mechanism of the closing device 5 is operating, that is, when the first slider 60 is in the second position (in this embodiment, a state slightly compressed from the normal length). The first compression force is smaller than the first restoring force. The second coil spring 72 is a compression spring and has a second restoring force from the compressed state (when the third slider 71 moves to the first side when an obstacle is detected), and a second compression force for starting compression from the state when the second coil spring 72 moves to the second position integrally with the second slider 70 and the third slider 71, that is, the normal length. The second compression force is smaller than the second restoring force, and the first compression force is larger than the second restoring force. The second coil spring 72 compresses when a predetermined first force acts, and its length remains unchanged when a predetermined second force smaller than the first force acts. When the closing mechanism of the closing device 5 is operating, a force acts on the second coil spring 72 when the second slider 70 slides along with the sliding movement of the first slider 60, but the force at that time is the second force, and the second coil spring 72 remains unchanged in length without being substantially compressed, 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 close to the bottom wall 730 of the main body 73, and the pressing piece 713 protrudes into the opening 7300 of the bottom wall 730.The closing device 5 is attached by receiving the brake release lever ML within the opening 7300 of the bottom wall 730 of the second unit 7 and bringing the bottom wall 730 into contact with or close to the case of the opener M. The pressing piece 713 is located on the first side of the brake release lever ML. When the closing device 5 operates, the first slider 60 slides from the first position to the second position, and the protruding piece 603 of the first slider 60 located within 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. The pressing piece 713 presses the brake release lever ML to the second side, rotating the brake release lever in the brake release direction. The operating force due to the extension of the first coil spring 61 is directly transmitted from the first slider 60 to the second slider 70 and presses the brake release lever by the pressing piece 713 of the third slider 71 that slides integrally with the second slider 70. Therefore, the spring force of the first coil spring 61 can be efficiently and stably output as the brake release force. A brake return wire (wire W1) that pulls the third slider 71 to the first side when an obstacle is detected is connected to the third slider 71. When an obstacle is detected, the third slider 71 is pulled to the first side. At this time, the force acting on the wire W1 is the first force, the second coil spring 72 is compressed, and the third slider 71 moves independently to the first side from the second slider 70 (in the second position), 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 back to the first position, restoring the brake. At this time, the first compression 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 compression force of the second coil spring 72 (the force that compresses the second coil spring 72 of its normal length) and the second restoring force (the force by which the compressed second coil spring 72 extends). Therefore, 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 integrally from the second position to the first position. When the first slider 60 at the second position is slid to the first position during the recovery of the actuated closing mechanism, the second slider 70 and the third slider 71 at the second position slide integrally to the first position.

[0072] The closing device 5 needs to be assembled by arranging many components at predetermined positions 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, overlapping the first unit 6 and the second unit 7, and connecting them with screws, which results in good workability of the on-site assembly operation. More specifically, when the first unit 6 and the second unit 7 are carried into the site, the second unit 7 is fixed to the opening and closing machine M by receiving the brake release lever ML into the opening 7300 of the bottom wall 730 of the main body 73, and one end side of the wire W1 is fixed to the third slider 71 of the second unit 7. At this time, the other end side of the wire W1 is not attached to the relay device 8. One end side of the wire W3 is fixed to the holding means 62 of the first unit 6. At this time, the attachment adjustment between the other end side of the wire W3 and the manual operation part of the operation box 10 has not been performed. With respect to the second unit 7, the protruding piece 603 of the first slider 60 of the first unit 6 is inserted into the opening 703 of the surface part 700 of the second slider 70 of the second unit 7, the first unit 6 is overlapped, and the main body 64 of the first unit 6 and the main body 73 of the second unit 7 are fixed with screws. After that, the attachment adjustment of the other end side of the wire W1 and the other end side of the wire W3 is performed. At this time, one end side of the wire W1 is connected to the third slider 71, 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 the protruding piece 603 of the first slider 60 being inserted into the opening 703 of the second slider 70, and the third slider 71 cannot move to the first side unless a large force that compresses the second coil spring 72 is applied. The second coil spring 72 is not compressed by a force that manually pulls the other end side of the wire W1. Therefore, when the other end side of the wire W1 is attached 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, after temporarily fixing with a fixing piece, the attachment adjustment is performed with respect to 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 position or a steady state. The first slider 60, the holding means 62 of the first unit 6, the second slider 70, and the 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 surface portion 700 of the second slider 70 and is in contact with or close to the opening edge. The brake release lever ML of the opening / closing machine M is in the first position (brake operating state), and the pressing piece 73 of the third slider 71 of the second unit 7 is in contact with (non-pressing state) or close to the brake release lever ML (upper figure in FIG. 20).

[0074] [B-4-2] Operation of the automatic closing mechanism When a fire detection signal is input during a fire, the automatic closing mechanism operates to lower the shutter curtain 1 by its own weight. Specifically, based on the input of the fire detection signal, the solenoid 63 is energized to pull the shaft portion 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. As the first coil spring 61 extends, the first slider 60 slides from the first position to the second position. 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 lower by its own weight.

[0075] Figure 16 shows the closing device 5 after the automatic closing mechanism is actuated. The first slider 60 of the first unit 6, the second slider 70 of the second unit 7, and the third slider 71 are in the second position, and the locking state between the locking portion 621 of the holding means 62 and the locked portion 606 of the first slider 60 is released. The wire W3 is in a tensioned state. The solenoid 63 returns to the non-energized state after momentary energization, but the locking portion 621 is placed on the locked portion 606, and the shaft portion 630 is in a pulled position. The first coil spring 61 is in an extended state. The length of the coil spring 66 is longer by the amount that the connecting piece 625 is pulled to the first side by the shaft portion 630 compared to the state of FIG. 15. The coil spring 67 is in an extended state (central figure in FIG. 22). The protruding piece 603 of the first slider 60 abuts against the edge of the opening 703 of the surface portion 700 of the second slider 70. The brake release lever ML of the opening / closing machine M is in the second position (brake release 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 (central figure in FIG. 20). Further, the protruding piece 605 of the first slider 60 protrudes so that the protruding amount from the opening 6420 of the second side wall 642 of the main body 64 of the first unit 6 becomes large.

[0076] [B-4-3] Brake return after the operation of the automatic closing mechanism When the shutter curtain 1 during self-weight descent hits an obstacle and obstacle detection is performed, the brake return (wire W1 + wire W2) is pulled, so that the third slider 71 connected to one end of the wire W1 is pulled to the first side so as to move from the second position to the first position. The third slider 71 compresses the second coil spring 72 while the second rising piece 712 of the third slider 71 (at this time, a biasing force toward the second side is stored in the third slider 71), and slides independently of the second slider 70 (maintaining the second position) toward the first side. The pressing of the brake release lever ML in the brake release direction by the pressing piece 713 of the third slider 71 is released, the brake returns, and the shutter curtain 1 during self-weight descent stops.

[0077] Figure 17 shows the brake return state after the operation of the automatic closing mechanism. The third slider 71 is in a state of further sliding and moving to the second side from the first position, the second slider 70 is in the second position, and the second coil spring 72 is in a compressed state. The pressing piece 713 of the third slider 71 is separated from the brake release lever ML, and the pressing of the brake release lever ML in the brake release direction by the pressing piece 713 is released, and the brake has returned (the lower figure in Figure 20). The positions and postures of the components of the first unit 6 (the first slider 60, the first coil spring 61, the holding means 62, etc.) are the same as the state after the operation of the automatic closing mechanism. In this state, when the obstacle is removed, the tension state of the brake return wire (wire W1 + wire W2) is released, wire W1 loosens, and by the biasing force of the compressed second coil spring 72, the third slider 71 slides and moves to the second position toward the second side, and the pressing piece 713 of the third slider 71 presses the brake release lever ML in the brake release direction to release the brake again, resulting in the state shown in the central figures of Figures 16 and 20, and the shutter curtain 1 descends again under its own weight.

[0078] [B-4-4] Operation of the Manual Closing Mechanism In the fully open state of the opening, by pressing the emergency closing switch 102 of the operation box 10, the manual closing mechanism can be operated to cause the shutter curtain 1 to descend under its own weight. Specifically, when the emergency closing switch 102 is pressed, the wire W3 in a tension state loosens, the force holding the holding means 62 in the first position is released, and as the first coil spring 61 extends, with the holding means 62 locked to the first slider 60, the first slider 60 and the holding means 62 slide and move together from the first position to the second position. 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 and move 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 to release the brake, and thus the shutter curtain 1 descends under its own weight.

[0079] FIG. 18 shows the closing device 5 after the manual closing mechanism is actuated. The first slider 60, the holding means 62 of the first unit 6, the second slider 70, and the 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 de-energized, and the shaft portion 630 extends from the first position to the second position as the holding means 62 moves from the first position to the second position. The first coil spring 61 is in an extended state. The coil spring 66 is contracted compared to the state shown in FIG. 15. The protruding piece 603 of the first slider 60 is located within the opening 703 of the surface portion 700 of the second slider 70 and abuts against the opening edge. 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 machine M is in a brake release state.

[0080] [B-4-5] Brake return after actuation of the manual closing mechanism When the shutter curtain 1 during self-weight descent hits an obstacle and obstacle detection is performed, the brake return wire (W1 + W2) is pulled, so that the third slider 71 connected to one end of the wire W1 is pulled toward the first side so as to move from the second position to the first position. The third slider 71 compresses the second coil spring 72 while the second rising piece 712 of the third slider 71 (at this time, a biasing force toward the second side is stored in the third slider 71), and slides independently of the second slider 70 (which maintains the second position) toward the first position. The pressing of the brake release lever by the pressing piece 713 of the third slider 71 is released, the brake returns, and the shutter curtain during self-weight descent stops.

[0081] Figure 19 shows the brake return state after the operation of the manual closing mechanism. The third slider 71 is in a state of further sliding and moving to the first side from the first position, 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 (the first slider 60, the first coil spring 61, the holding means 62, etc.) of the first unit 6 are the same as those after the operation of the manual closing mechanism. When the obstacle is removed, the tension state of the brake return wire (wire W1 + wire W2) is released, wire W1 loosens, and due to the biasing force of the compressed second coil spring 72, the third slider 71 slides and moves to the second position toward the second side. The pressing piece 713 of the third slider 71 presses the brake release lever to release the brake again, resulting in the state of Figure 18, and the shutter curtain 1 descends under its own weight again.

[0082] [B-5]Recovery of the activated closing device In addition to the manual closing function, the operation box 10 according to this embodiment is provided with an automatic closing mechanism and a recovery function of the manual closing mechanism. The operation box 10 is provided with an emergency closing switch 102 for manual closing and a return lever 103. The pressing operation of the emergency closing switch 102 and the manual rotation operation of the return lever 103 can be performed with the lid 100 of the operation box 10 closed. One end of wire W3, which is a component of the manual closing mechanism, is connected to the holding means 62 of the first unit 6 of the closing device 5, and the other end of wire W3 extends into the operation box 10. Inside the operation box 10, a wire end fixing part for fixing the end (the other end) of wire W3 is provided. The position of the wire end fixing part can be fixed by the locking means, and by locking the wire end fixing part with wire W3 in a tension state, the tension state of wire W3 is maintained. Wire W3 is also a component of the recovery mechanism.

[0083] The operation parts of the manual operation part, specifically, the emergency closing switch 102 and the recovery lever 103 of the operation box 10, are mechanically connected to the other end side of the wire W3. When the emergency closing switch 102 is pressed, the lock by the locking means is released, the wire end fixing part moves upward by a predetermined distance, the wire W3 in a tensioned state is loosened, and the recovery lever 103 tilts forward with respect to the surface of the cover body 100 (the operating posture of the manual closing mechanism). When the tilted rotating lever 103' is rotated downward forward, the wire end fixing part is pulled down to the locking position, the wire W3 is pulled by a predetermined distance, and the movement of the wire W3 is restricted by the locking means in a state where tension is applied to the wire W3. Then, the rotating lever 103'' is rotated upward and housed in the operation box 10 to be in a set state.

[0084] The first slider 60 and the 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. The recovery lever 103 is a common operation part for recovery of the closing device (automatic closing mechanism, manual closing mechanism) 5. By pulling the wire W3, the recovery lever 103 is adapted to recover the operated closing device (automatic closing mechanism, manual closing mechanism) 5. That is, the recovery device according to the present embodiment can perform the recovery of the automatic closing mechanism and the recovery of the manual closing mechanism with one recovery device. There is no need for a recovery device for recovering an 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, and a closing device with a simpler configuration can be obtained.

[0085] [B-5-1] Recovery of the automatic closing mechanism The upper figure in FIG. 22 shows the closing device 5 in a steady state. The first slider 60, the holding means 62 of the first unit 6, the second slider 70, and the third slider 71 of the second unit 7 are in the first position. The locking roller 6211 of the locking part 621 of the holding means 62 is locked to the locked part 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 part 630 is in the first position. The first coil spring 61 (not shown in the upper figure of FIG. 22) is in a compressed state.

[0086] When the automatic closing mechanism operates from this state, based on the input of a fire detection signal, the solenoid 63 is energized, pulling the shaft portion 630 to the first side, thereby rotating the locking portion 621 of the holding means 62 to the side opposite to the locking direction, releasing the locked 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 extends, the first slider 60 slides from the first position to the second position. 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 1 to descend by its own weight.

[0087] The central view of Fig. 22 shows the closing device 5 after the operation of the automatic closing mechanism. The first slider 60 of the first unit 6, the second slider 70 of the second unit 7, and the third slider 71 are in the second position, and the locked state between the locking portion 621 of the holding means 62 and the locked portion 606 of the first slider 60 is released. The wire W3 is in a tensioned state, and the solenoid 63 returns to the non-energized state after instantaneous energization, but the locking roller 6211 of the locking portion 621 is in contact with the locked portion 606 in a resting state. When the automatic closing mechanism operates 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] In the state after the operation of the automatic closing mechanism shown in the central view of Fig. 22, when the first operation of the manual operation part (pressing the emergency closing switch 102) relaxes the tensioned wire W3, the holding means 62 is pulled to the second side by the biasing force of the coil spring 67 and moves from the first position to the second position.

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

[0090] In this state, by rotating the second operation (recovery lever 103) of the manual operation part and pulling the wire W3 to the other end side, the first slider 60 and the holding means 62 at the second position are integrally moved to the first position toward the first side while maintaining the locked state, and the wire W3 is put back in a tensioned state and the other end side of the wire W3 is locked and fixed to recover the operated automatic closing mechanism.

[0091] When pulling the wire W3 by rotating the recovery lever 103, a large force acts on the locking portion between the locking roller 6211 of the locking portion 621 and the locked portion 606 of the first slider 60. However, due to the coil spring 66, the locking portion 621 can stably slide from the second position to the first position while maintaining the locking posture. It is considered that the largest force acts on the locking portion when the wire W3 is completely pulled by the recovery lever 103. In this embodiment, when the first slider 60 and the holding means 62 reach the first position, the coil spring 66 is in the most extended state. At this time, the coil spring 66 pulls the part separated from the rotation fulcrum (shaft portion 6212) of the locking portion 621 to the second side through the connecting piece 625, so that the force (the force to maintain the locked state) that biases the locking portion 621 of the holding means 62 in the locking direction by the coil spring 66 becomes the largest, ensuring that the locked state is not released.

[0092] [B-5-2] Restoration of Manual Locking Mechanism To restore the activated manual locking mechanism, by the second operation of the manual operation part, pulling the wire W1 to the other end side moves the first slider 60 and the holding means 62 in the second position to the first position, and by putting the wire W1 in a tensioned state, the manual locking mechanism is restored.

[0093] [B-6] Movement of Operating Parts During Electric Descent With reference to Fig. 21, the obstacle detection during electric descent will be described. The upper figure in Fig. 21 shows the closing device 5 during electric opening and closing. Each component of the first unit 6 and each component of the second unit 7 of the closing device 5 are in a steady state. Specifically, the first slider 60, the holding means 62 of the first unit 6, the second slider 70, and the third slider 71 of the second unit 7 are in the first position, the locking part 621 of the holding means 62 is locked to the locked part 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 part 630 is in the first position. The first coil spring 61 (not shown in Fig. 21) is in a compressed state. The protruding piece 603 of the first slider 60 is located in the opening 703 of the surface part 700 of the second slider 70. By rotating the output shaft of the opener M through the control part (obstacle detection control panel 11A, shutter control panel 11B) by an opening and closing operation from the opening and closing operation switch 101 of the operation box 10, the winding shaft is rotated forward and backward to raise and lower the shutter curtain 1. The first microswitch SW1 of the second unit 7 determines that the shutter is in the electric opening and closing mode by detecting that the second slider 70 is in the steady position (the first position).

[0094] When the shutter curtain 1 descends electrically and the seat plate 3 at the lower end of the shutter curtain 1 abuts against an obstacle, the pulling out of the brake return wire (W1 + W2) is restricted by the locking device 9, and the third slider 71 is pulled to the second side by the wire W1. Thus, while compressing the second coil spring 72, the third slider 71 moves from the normal position to the second side, and when the second microswitch SW2 detects the movement of the third slider 71, an obstacle detection signal is transmitted to the obstacle detection control panel 11A. When an obstacle detection signal is input to the obstacle detection control panel 11A, the electric downward movement of the opener M is stopped via the shutter control panel 11B (in one form, it is stopped once it has risen after stopping, that is, it is touched up). When the obstacle is removed, the pulling force of the brake return wire (W1 + W2) disappears, the compressed second coil spring 72 extends, the second slider 71 returns to the normal position, the input of the obstacle detection signal is released, and the electric opening and closing operation becomes possible.

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

[0096] [C-1] Electric opening and closing mode In the normal mode, the electric opening and closing of the shutter curtain 1 is performed by pressing the push button of the opening and closing operation switch 101. More specifically, when the release switch U is pressed in the fully closed state or the half-open state of the opening, a signal is sent to the shutter control panel 11B via the obstacle detection control panel 11A, and the opening and closing machine M operates to rotate the winding shaft in the first direction to raise the shutter curtain 1 while winding it up. When the shutter curtain 1 rises, the wire W2 is wound onto the winding drum of the locking device 9. When the shutter curtain 1 rises to a preset upper limit position, the upper limit limit switch operates to stop the operation of the opening and closing machine M, stop the rotation of the winding shaft, and stop the winding of the shutter curtain 1.

[0097] When the closing switch D is pressed in the fully open state or the half-open state of the opening, a signal is sent to the shutter control panel 11B via the obstacle detection control panel 11A, and the opening and closing machine M operates to rotate the winding shaft in the second direction to lower the shutter curtain 1. When the shutter curtain 1 descends, 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 lower end of the descending shutter curtain 1 hits an obstacle, the lower seat plate 31 moves upward relative to the upper seat plate 30, the pulling out of the wire W2 is restricted by the locking device 9, and the upper seat plate 30 moves downward relative to the lower seat plate 31, so that the wire W2 with the restricted pulling out is pulled, the wire W1 is pulled via the relay device 8, the third slider 71 moves from the normal position to the first side (right side in the figure), the second microswitch SW2 changes from OFF to ON, and an obstacle detection signal (seat plate operation signal) is sent to the obstacle detection control panel 11A. The obstacle detection control panel 11A that receives the obstacle detection signal stops the operation of the opening and closing machine M for a predetermined time (for example, 1 second) via the shutter control panel 11B, and then operates the opening and closing machine M to reversely raise the shutter curtain 1 for a predetermined time (for example, 1.5 seconds) (touch-up), and then stops it. After that, by pressing the closing switch D of the opening and closing operation switch 101, the shutter curtain 1 can be electrically lowered again.

[0098] When the lower seat plate 31 at the lower end of the shutter curtain 1 that descends electrically lands, the lower seat plate 31 moves upward relative to the upper seat plate 30, the pulling out of the wire W2 is restricted by the locking device 9, and when the upper seat plate 30 moves downward relative to the lower seat plate 31, the wire W2 with restricted pulling out is pulled, the wire W1 is pulled via the relay device 8, the third slider 71 moves from the normal position to the second side (right side in the figure), the second microswitch SW2 changes from OFF to ON, and an obstacle detection signal is transmitted to the obstacle detection control panel 11A. The obstacle detection control panel 11A that receives the obstacle detection signal stops the operation of the opening and closing machine M via the shutter control panel 11B and stops the descent of the shutter curtain 1.

[0099] [C-2] Gravity descent mode When the automatic closing mechanism is activated by the input of a fire detection signal from the disaster prevention panel 4b, the locking state between the first slider 70 and the holding means 62 is released, 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. Or, when the tension of the wire W1 is relaxed by pressing the emergency closing switch 102, the tension force that maintains the holding means 62 at the first position is released, 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 and the first microswitch SW1 changes from ON to OFF, an operation confirmation signal is continuously output from the second unit 7 to the obstacle detection control panel 11A, and when the obstacle detection control panel 11A receives the operation confirmation signal, it changes from the electric opening and closing mode (normal mode) to the gravity descent mode (fire mode). When the obstacle detection control panel 11A is in the gravity descent mode, the electric opening and 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 and closing operation switch 101 are invalidated. When the shutter curtain 1 is in the process of electric opening and closing, the movement of the shutter curtain 1 stops and the gravity descent starts promptly.

[0100] When the lower seat plate 31 at the lower end of the shutter curtain 1 during self-weight lowering hits an obstacle, the lower seat plate 31 moves upward relative to the upper seat plate 30, the pulling out of the wire W2 is restricted by the locking device 9, and the upper seat plate 30 moves downward relative to the lower seat plate 31, so that the wire W2 with restricted pulling out is pulled, the wire W1 is pulled through the relay device 8, and the third slider 71 that has moved to the brake release position moves toward the second side to the first position, the brake of the opener M returns, and the shutter curtain 1 during self-weight lowering stops.

[0101] When the obstacle is removed, the lower seat plate 31 that has moved upward can move downward, the restriction on the pulling out of the wire W2 is released, the second coil spring 72 extends, the third slider 71 moves to the brake release position, the brake of the opener M is released by the brake release lever ML, and the shutter curtain 1 resumes self-weight lowering. When the lower seat plate 31 at the lower end of the shutter curtain 1 during self-weight lowering lands, the lower seat plate 31 moves upward relative to the upper seat plate 30, the pulling out of the wire W2 is restricted by the locking device 9, and the upper seat plate 30 moves downward relative to the lower seat plate 31, so that the wire W2 with restricted pulling out is pulled, the wire W1 is pulled through the relay device 8, the third slider 71 moves from the brake release position to the steady position, and the brake returns. The brake of the opener M returns, and the shutter curtain 1 during self-weight lowering stops and becomes fully closed.

[0102] [D] Closing device with improved workability during construction The closing device 5 according to the present embodiment is configured by assembling the first unit 6 and the second unit 7 in a direction orthogonal 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 as to overlap in the protruding direction of the brake release lever ML of the opener M.

[0103] [D-1] Screw used for assembling the first unit As shown in FIG. 6, a first slider 60, a first coil spring 61, holding means 62, a solenoid 63, a slide shaft 65, and a microswitch SW are incorporated in the main body 64 of the first unit 6. The first unit 6 is provided with an automatic closing mechanism, and the automatic closing mechanism includes holding means 62 that engages with the first slider 60 and holds it in the first position, and a solenoid 63 that operates by energization based on a fire detection signal and releases the locking state between the first slider 60 in the first position and the holding means. One end of a wire W3, which is a manual closing wire, is connected to the holding means 62, and the other end side of the wire W3 is connected to a return lever 103 (see FIGS. 1 and 5) of the manual closing mechanism. One end side of the 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. On the outer surface of the first side wall 641 of the main body 64 of the first unit 6, a mounting piece 68 having an L shape in side view L is fixed using a screw S2 through a second portion 681 from a pair of first portions 680 and the second portion 681, and the head of the screw S2 is exposed. Between the pair of first portions 680 of the mounting piece 68, a pair of third portions 682 extending parallel to the first portion 680 are formed. On the outer surface of the first side wall 641 of the main body 64 of the first unit 6, the head of a screw S3 for attaching a plate-like member that supports the solenoid 63 of the holding means 62 is exposed. On the bottom wall 640 of the main body 64, an L-shaped member forming a contact rising piece 643 is fixed using a screw S4, and the head of the screw S4 is exposed on the outer surface of the bottom wall 640. On the outer surface of the bottom wall 640 of the main body 64 of the first unit 6, the heads of screws 623 and 624 for attaching the guide plate 622 of the holding means 62 are exposed.

[0105] As shown in FIG. 25, one end of the wire W3 is locked to the edge on the first side of the opening 6206 formed in the base 620 of the holding means 62, and the wire W3 is sandwiched between the base 620 and the pressing plate 690, and two screws 69 are tightened and fixed. The pressing plate 690 according to the present embodiment is rotatable with the shaft portion of one screw 69 inserted therethrough, and the shaft portion of the other screw 69 is received in the locking recess 691. The wire W3 is inserted through the outer wire W3´, and the outer wire W3´ is sandwiched by the pressing plate 690´ with the outer wire W3´ positioned between the pair of third portions 682, and two screws 69´ are tightened and fixed to the main body 64.

[0106] As described above, the first unit 6 is configured by assembling a plurality of elements using a plurality of screws. However, the plurality of screws (S1, S2, S3, S4, 69, 69´, 623, 624) exposed outside the main body 64 of the first unit 6 are composed of a first group (screws 69, 69´) used during the construction of the first unit 6 at the site and a second group (screws S1, S2, S3, S4, 623, 624) not used during the construction.

[0107] As shown in FIGS. 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), which is the same as the metallic (silver) color of the main body 64 and the first slider 60. The plurality of screws 69, 69´ belonging to the first group and the plurality of screws S1, S2, S3, S4, 623, 624 belonging to the second group are visually distinguishable by making the colors of the screws different.

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

[0109] As shown in FIGS. 24 and 26, the longitudinal end portions 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] As shown in FIG. 26, the wire W1 has one end portion of the wire W1 locked between a pair of bent pieces 714 of the third slider 71, and the end portion of the wire W1 is sandwiched between the bent piece 714 and the pressing plate 770, and two screws 77 are tightened and fixed. The pressing plate 770 according to the present embodiment is rotatable with one screw 77 inserted through the shaft portion thereof, and the shaft portion of the other screw 77 is received in the locking recess 771. The wire W1 is inserted through the outer wire W1´, and the outer wire W1´ has one end side of the outer wire W1´ positioned between a pair of central bent pieces 7311, and the outer wire W1´ is sandwiched by the pressing plate 780 and two screws 78 are tightened to fix it to the main body 73.

[0111] A screw 76 is provided on the second side wall 732 of the second unit 7. The screw 76 includes a hexagonal head 760 and a shaft portion 761. The shaft portion 761 extends in the sliding direction of the second slider 70, and the tip of the shaft portion 761 can contact the tip edge of the protruding portion 700´ on the second side of the surface portion 700 of the second slider 70 (see FIG. 26).

[0112] As described above, the second unit 7 is configured by assembling a plurality of elements using a plurality of screws. However, the plurality of screws (S1, 76, 77, 78) exposed outside the main body 73 of the second unit 7 are composed of a first group (screws 76, 77, 78) used during the construction of the first unit 6 at the site and a second group (screw S1) not used during the construction.

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

[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 the first direction (a direction orthogonal to the sliding direction of the first slider 70 and the second slider 71) and screws 76 belonging to a second subgroup that are screwed in (screw in and out) in a second direction orthogonal to the first direction (the sliding direction of the first slider 70 and the second slider 71). In the present embodiment, the screws 77, 78 belonging to the first subgroup are screws with round heads, and the screws 76 belonging to the second subgroup are screws with hexagonal heads. By making the shapes of the screws in the first subgroup and the second subgroup different, they are visually distinguishable.

[0115] [D-3] Screws used for assembling the first unit and the second unit 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 as to overlap. In one aspect, as shown in FIG. 28, first, the second unit 7 is attached to the lower surface of the opening / closing machine M, and the first unit 6 is attached to the second unit 7 attached to the opening / closing machine M.

[0116] On 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, screw holes 7312 are respectively formed (see Fig. 26), and screws 79 are temporarily fixed in advance in the respective screw holes 7312 (see Fig. 28). In each of the pair of first portions 680 of the mounting piece 68 of the first unit 6, locking grooves 683 capable of receiving the shaft portions of the screws 79 are formed (see Fig. 25). With the second unit 7 attached to the opening / closing machine M, by locking the locking groove 683 of the first unit 6 to the screw 79, one end side of the first unit 6 can be supported and held by the second unit 7. The screw 79 according to this embodiment is a black screw.

[0117] A hole (which may be a screw hole or an insertion hole) 6404 is formed at the 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 sides in the width direction 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 locked to the screw 79 of the second unit 7, with the tip side as a fulcrum, the base end side of the first unit 6 is rotated upward, 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 with a screw 79' from below (see Fig. 27). The screw 79' according to this embodiment is a black screw.

[0118] [D-3] Construction of the First Unit and the Second Unit at the Site The first unit 6 and the second unit 7 constitute a closing device for a fire shutter through a predetermined construction at the 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 case of a fire, due to the operation of the automatic closing mechanism, the first slider 60 moves in the first direction from the first position to the second position. As shown in FIG. 6, in the first unit 6, a slider unit (first slider unit) is formed by the first slider 60 and a holding means 62 in a locked state with the first slider 60. A wire W3 can be connected to the holding means 62 forming the slider unit. By loosening the wire W3 in a tensioned state by the emergency closing switch 102 of the manual closing mechanism, the slider unit is moved in the first direction from the first position to the second position using the biasing force of the first coil spring 61.

[0119] The second unit 7 includes a slider unit (second slider unit) movable on a slide shaft 74. This slider unit includes a second slider 70 movable in conjunction with the movement of the first slider 60 and a second coil spring 72 between the second slider 70. When the second slider 70 moves in the first direction from the first position to the second position, it moves integrally with the second slider 70 via the second coil spring 72 to release the brake of the switch M. By compressing the second coil spring 72, it moves in the second direction toward the first position independently of the second slider 70 to return the brake of the switch M, and includes a third slider 71. A wire W1 constituting a brake return wire for pulling 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 the present embodiment, the first slider 60 is provided with a protruding piece 603 extending toward the second unit, and the second slider 70 is provided with an opening 703 for receiving the protruding piece 603 of the first slider 60. The protruding piece 603 is positioned within the opening 703 and can abut against the edge of the opening 703. The protruding piece 603 and the opening 703 constitute the interlocking means.

[0121] As shown in the upper figure of FIG. 29, the slider unit including the second slider 70, the third slider 71, and the second coil spring 72 can slide in the left - right direction (the first direction, the second direction) on the slide shaft 74 in a free state.

[0122] As shown in the central figure of FIG. 29, the slider unit including the second slider 70, the third slider 71, and the second coil spring 72 has its first position determined by being restricted from moving in the first direction and the second direction by a screw 76 as the first movement restricting means for restricting movement in the first direction and a spacer 75 as the second movement restricting means for restricting movement in the second direction.

[0123] As shown in FIG. 33, the spacer 75 is composed of a flat - rectangular face portion 750 and a pair of side face portions 751 that vertically rise oppositely from both longitudinal ends of the face portion 750. One side edge of the side face portion 751 includes a vertical edge 752, and the other side edge includes a first vertical edge 753 on the side close to the face portion 750, a second vertical edge 754 on the side far from the face 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 dimension in the short - hand direction of the bottom face portion 750, and the shortest distance d2 between the vertical edge 752 and the second vertical edge 754 is shorter than d1. In the present embodiment, by preparing one type of spacer 75, two distances d1 and d2 can be set. When the spacer 75 sets the distance d2, it is shown as the spacer 75´ (see the lower figure of FIG. 31).

[0124] The screw 76 is screwed into the second side wall 732 of the main body 73 of the second unit 7. In the deepest screwed-in position where the head 76 abuts against the outer surface of the second side wall 732, the tip of the shaft portion 761 abuts against the leading edge of the protruding portion 700' of the second slider 70, thereby determining the first position of the second slider 70, and from this state, the second slider 70 is restricted from moving in the first direction. When the second unit 7 is installed or when the first unit 6 is installed on the second unit 7, if the slider unit (the second slider 70, the third slider 71, the 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, and during the installation work, there is a risk that the brake of the opening / closing machine M is accidentally released and the shutter curtain 1 starts to descend due to its own weight. In the present embodiment, the tip of the shaft portion 761 of the screw 76 (extending in the moving direction of the slider unit) abuts against the leading edge of the protruding 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 central view of FIG. 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 from this state, the third slider 71 is restricted from moving in the second direction. The central view of FIG. 29 and the upper view of FIG. 31 are substantially the same figure. As shown in the upper view of FIG. 31, the vertical edge 752 of the spacer 75 abuts against the outer surface of the first rising piece 711 of the third slider 71, and the 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 the first position of the slider unit composed of the second slider 70, the third slider 71, and the second coil spring 72, and from this state, the movement in the second direction is restricted.

[0126] As described above, by using the screw 76 and the spacer 75 to restrict the movement of the slider unit including the second slider 70, the third slider 71, and the second coil spring 72 in the first direction and the second direction, the first position of the slider unit is determined. When the slider unit is in the first position, the first position of the third slider 71 is determined, and the positioning of the third slider 71 to which the wire W1 is connected is performed. As shown in the lower figure of FIG. 29, by connecting the wire W1 to the third slider 71 positioned by the positioning means composed of the screw 76 and the spacer 75, the wire W1 is designed to be set in the proper position.

[0127] The attachment of the wire W1 will be described more specifically. As shown in FIG. 26, the holding plate 770 in the first posture extending in the direction orthogonal to the length direction of one end side of the wire W1 is rotated with the shaft portion of one screw 77 as the rotation fulcrum to be in the second posture extending in the length direction of one end side of the wire W1 to be attached. The end portion of one end side of the wire W1 is locked between the pair of bent pieces 714 of the third slider 71 to be in the locked state. The holding plate 770 is rotated to the first posture, the shaft portion of the other screw 77 is received in the locking recess 771, and the two screws 77 are tightened to fix the end portion of one end side of the wire W1 to the third slider 71.

[0128] The wire W1 is inserted through the outer wire W1'. The outer wire W1' is sandwiched by the holding plate 780 with one end side of the outer wire W1' positioned between the pair of central bent pieces 7311, and the two screws 78 are tightened and fixed.

[0129] In this embodiment, the screws 77 and 78 are black and are distinguishable by color from other parts of the second unit 7 including a plurality of other screws S1 (such as the main body 73, the second slider 70, the third slider 71, etc.). During operation, the screws 77 and 78 to be used and their positions can be easily recognized. Therefore, by previously informing that the black screws are the screws to be used during installation, the screws 77 and 78 to be used can be recognized without confusion and accessed, and it is possible to prevent accidentally loosening or removing other screws S1. It should be understood by those skilled in the art that when the second unit 7 is carried into the site and the screws 77 and 78 are tightened, it is necessary to loosen the screws 77 and 78 prior to the connection operation of the wire W1 and the outer wire W1'.

[0130] The spacer 75 is removed after the wire W1 is set in the proper position. In one aspect, as shown in the upper figure of FIG. 30, by slightly loosening the screw 76 to allow the slider unit composed of the second slider 70, the third slider 71, and the second coil spring 72 to move in the first direction, 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 becomes larger than d1, and the spacer 75 can be easily removed. As shown in the lower figure of FIG. 30, after removing the spacer 75, the screw 76 is tightened again, and the tip of the shaft portion 761 of the screw 76 is brought into contact with the tip edge of the protruding portion 700' of the second slider 70, so that during operation (such as when the first unit 6 is attached to the second unit 7), the movement of the second slider 70 at the first position in the first direction is restricted.

[0131] In the first unit 6, the slider unit composed of the first slider 60 and the holding means 62 in a locked state with the first slider 60 is biased by the first coil spring 61 to move in the first direction. However, the slider unit is set at a temporarily fixed position where the movement in the first direction is restricted by the spacer 75' as the third movement restricting means before the wire W3 is connected to the holding means 62.

[0132] The following figure shows the state in which the slider unit, which consists of the first slider 60 and the holding means 62 in a locked state with the first slider 60, is set at the temporary fixing position. The vertical edge 752 of the spacer 75' abuts 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' abuts against the edge 600' of the surface portion 600 of the first slider 60, thereby restricting the movement of the first slider 60 in the first direction. The first slider 60 is biased in the first direction by one end side of the first coil spring 61 abutting against the inner surface of the second rising piece 602, and the other end side 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 movement of the slider unit, which consists of the first slider 60 and the holding means 62 in a locked state with the first slider 60, in the second direction is restricted, and the temporary fixing position is maintained.

[0133] In the upper figure of Fig. 31, the second slider 70 of the second unit 7 is in the first position, and in the lower figure, the first slider 60 of the first unit 6 is in the temporary fixing position. In this state, the protruding piece 603 of the first slider 60 and the opening 703 of the second slider 70 are aligned. When attaching the first unit 6 so as to overlap the second unit 7, the protruding piece 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 the interlocking means. That is, the screw 76, the spacer 75, and the spacer 75', which are the movement restricting means, function as the alignment means of the interlocking means. That is, the screw 76, the spacer 75, and the spacer 75' are the alignment and movement restricting means.

[0134] Referring to FIG. 32, the connection of wire W3 in the first unit 6 will be described. When the slider unit including the first slider 60 and the holding means 62 in a locked state with the first slider 60 is in the temporarily fixed position, one end side of the wire W3 is fixed to the holding means 62. As shown in FIG. 25, the pressing plate 690 in the first posture extending in a direction orthogonal to the length direction of one end side of the wire W3 is rotated with the shaft portion of one screw 69 as the rotation fulcrum to be in the second posture extending in the length direction of one end side of the wire W3 to be attached. The end portion of one end side of the wire W3 is locked to the edge portion on the first side of the opening 6206 formed in the base 620 of the holding means 62 to be in the locked state. The pressing plate 690 is rotated to the first posture, the shaft portion of the other screw 69 is received in the locking recess 691, and the two screws 69 are tightened to fix the end portion of one end side of the wire W3 to the holding means 62.

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

[0136] In the present embodiment, the screws 69 and 69' are black and are distinguishable by color from other parts (such as the main body 64 and the slider 60) of the first unit 6 including a plurality of other screws S1, S2, S3, S4, 623, and 624. During the operation, the screws 69 and 69' to be used and their positions can be easily recognized. Therefore, by informing in advance that the black screws are the screws to be used during installation, the screws 69 and 69' to be used can be recognized and accessed without confusion, and it is possible to prevent accidentally loosening or removing other screws S1, S2, S3, S4, 623, and 624. It should be understood by those skilled in the art that when the first unit 6 is carried into the site and the screws 69 and 69' are tightened, it is necessary to loosen the screws 69 and 69' prior to the connection operation of the wire W3 and the outer wire W3'.

[0137] The other end side of the wire W3 is connected to the restoration lever 103 of the manual closing mechanism provided in the operation box 10. At this time, the restoration lever 103 is in a state of tilting forward with respect to the surface of the cover body 100. Further, when the restoration lever 103' is rotated downward forward, the wire end fixing portion is pulled down to the locking position, the wire W3 is pulled by a predetermined distance, and the movement of the wire W3 is restricted by the locking means in a state where tension is applied to the wire W3 (see FIG. 5). In the state of the upper diagram in FIG. 32, by pulling the other end side of the wire W3, the slider unit (the first slider 60, the holding means 62) in the temporary fixing position is slightly pulled in the second direction via the wire W3 and positioned at the first position (see the lower diagram in FIG. 32). At this time, the wire W3 is set at the proper 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, by defining different distances d1 and d2 by one type of member, the members are made common to reduce the number of parts, but two types of spacers may be prepared. Further, the shape of the spacer is not limited to the illustrated shape, and for example, it may be a block or a shaft member (typically a screw).

[0140] With reference to FIGS. 34 and 35, the mounting process of the closing device including the first unit 6 and the second unit 7 will be described. In one aspect, the first unit 6 and the second unit 7 are preset at the factory and temporarily connected in a heavy box shape (further, in a state where a cover having a U-shaped cross section (not shown) is attached to cover the open portions of three sides of the first unit 6 and the second unit 7), and are carried to the site. In this case, at the site, the cover is removed, and further, the black screws 79 and 79' are removed to disassemble the first unit 6 and the second unit 7.

[0141] With reference to FIG. 34, the attachment of the second unit 7 will be described. The second unit 7 is attached to the switch M in a preset state. In the second unit 7, a slider unit including a second slider 70, a third slider 71, and a second coil spring 72 is in a preset state positioned at the first position by providing a spacer 75 as a 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, with the tip of the shaft portion 761 of the screw 76 as a first movement restricting means abutting against the tip edge of the protruding portion 700' of the second slider 70. When the preset second unit 7 is attached to a predetermined position of the switch M, the pressing piece 713 of the third slider 71 of the second unit 7 is set at an appropriate position with respect to the brake release lever ML.

[0142] For the second unit 7 attached to the switch M, a wire W1 and an outer wire W1' are attached. One end side of the wire W1 is connected to the third slider 71 at the first position using a black screw 77, and the other end side of the wire W1 is connected to the relay device 8. One end side 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 at the first position, the screw 76 is loosened slightly and the spacer 75 is removed. Then, the screw 76 is tightened back to restrict the movement of the second slider 70 at the first position in the first direction. The first unit 6 is attached to the second unit 7 attached to the switch M.

[0144] When the second unit 7 is attached to the opening / closing machine M, the slider unit (second slider 70, third slider 71, second coil spring 72) in the first position is restricted from moving in the first direction by the screw 76. Therefore, it is prevented that the pressing piece 713 of the third slider 71 accidentally presses the brake release lever ML, releasing the brake of the opening / closing machine 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 machine M, the slider unit (second slider 70, third slider 71, second coil spring 72) in the first position is restricted from moving in the first direction by the screw 76. Therefore, it is prevented that the pressing piece 713 of the third slider 71 accidentally presses the brake release lever ML, releasing the brake of the opening / closing machine M and causing the shutter curtain 1 to start descending under its own weight. Since the screw 76 is a hexagon screw, it is possible to rotate the hexagonal head 760 in a direction perpendicular to the length direction of the shaft portion 761 of the screw 76 to tighten and loosen the screw 76. Even when the space outside the second side wall 732 of the main body 73 of the second unit 7 attached to the opening / closing machine M is narrow, it is possible to tighten and loosen the screw 76 with respect to the second side wall 732.

[0145] While referring to FIG. 35, the attachment of the first unit 6 will be described. The first unit 6 is attached to the second unit 7 attached to the opening / closing machine M in a preset state. In the first unit 6, a slider unit including a first slider 60 and a holding means 62 in a locked state with the first slider 60 is positioned in a preset state fixed temporarily 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 the outer wire W3' are attached to the preset first unit 6. One end side of the wire W3 is connected to the holding means 62 of the slider unit in the temporarily fixed position using the black screw 69, and one end side of the outer wire W3' is connected to the main body 64 of the first unit 6 using the black screw 69'.

[0147] The first unit 6, which is preset and has one end side of the wire W3 and the outer wire W3' connected thereto, is attached to the second unit 7 attached to the opening and closing machine 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 temporarily fixed 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 and closing machine M, the other end side 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 side of the wire W3 is slightly pulled, and the first slider 60 and the holding means 62 move from the temporarily fixed position to the first position. When the first slider 60 moves from the temporarily fixed position to the first position, the spacer 75' automatically drops off. After the installation of the closing device composed of the first unit 6 and the second unit 7 is completed, finally, the screw 76 is removed from the second unit 7, enabling the sliders (the second slider 70, the third slider 71, the first slider 60) in the first position to move in the first direction during the operation of the automatic closing mechanism or the manual closing mechanism. The closing device 5 according to the present embodiment is configured by stacking the first unit 6 and the second unit 7 in a direction orthogonal to the sliding direction of the first slider 60, the second slider 70, and the third slider 71. However, the screw 76 is a screw that screws in and out in a direction different from the stacking direction of the first unit 6 and the second unit 7, and since the head 760 is exposed on the outer surface of the second unit 7, after the first unit 6 and the second unit 7 are stacked and attached to the opening and closing machine M, it is possible to turn the head 760 of the screw 76 to remove the screw 76 from the second unit 7. Also, since the screw 76 is a hexagon screw, even when the space outside the second side wall 732 of the main body 73 of the second unit 7 attached to the opening and closing machine M is narrow, it is possible to rotate the hexagonal head 760 from a direction orthogonal to the length direction of the shaft portion 761 of the screw 76 to remove the screw 76 from the second side wall 732.

[0149] [Supplementary Note] This specification includes 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 in the first position to the second position, a second movable body that is movable between the first position and the second position in conjunction with the movement of the first movable body, a third movable body that is movable between the first position and the second position, has a second spring between the third movable body and the second movable body, moves integrally with the second movable body via the second spring to release the brake of the opening / closing machine when the second movable body moves from the first position to the second position, and moves toward the first position independently of the second movable body by compressing the second spring to return the brake of the opening / closing machine, and includes a first unit is formed from the first movable body, the first spring, and the automatic closing mechanism, a second unit is formed from 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 orthogonal to the moving directions of the first movable body, the second movable body, and the third movable body, and includes interlocking means for interlocking the first movable body and the second movable body. A closing device for a fire shutter is disclosed. In one aspect, the interlocking means is configured such that the first movable body and the second movable body can slide integrally from the first position to the second position and from the second position to the first position by contact between a portion of the first movable body and a portion of the second movable body. In one aspect, the first movable body includes a protruding piece extending toward the second unit, the second movable body includes an opening for receiving the protruding piece of the first movable body, and the protruding piece is located within the opening, and the interlocking means consists of the protruding piece and an edge of the opening. The interlocking means is not limited to the combination of the protruding piece of the first movable body and the opening of the second movable body. For example, it may be a combination of the opening of the first movable body and the protruding piece of the second movable body, or a combination of the protruding piece or protrusion of the first movable body and the protruding piece or convex portion of the second movable body. In one aspect, the first movable body and the second movable body can slide integrally from the first position to the second position and from the second position to the first position. A brake return wire for pulling the third movable body to the first side when an obstacle is detected is connected to the third movable body. The second spring is a compression spring. When a predetermined first force acts, it compresses. When a predetermined second force smaller than the first force acts, its length remains unchanged. When an obstacle is detected, the third movable body is pulled to the first side by the first force, so that the second spring is compressed, and the third movable body moves independently of the second movable body to the first side. When the automatic closing mechanism operates, the length of the second spring remains unchanged, and the second movable body and the third movable body move integrally from the first position to the second position. In one aspect, the first spring is a compression spring, and has a first restoring force from the compressed state when the first movable body is in the first position and a first compression force for starting compression from the state when the first movable body is in the second position. The first compression force is smaller than the first restoring force. The second spring is a compression spring, and has a second restoring force from the compressed state when the third movable body moves toward the first position and a second compression force for starting compression from the state when the second movable body and the third movable body move to the second position integrally. The second compression force is smaller than the second restoring force. The first compression force is greater than the second restoring force. In one aspect, the automatic closing mechanism has holding means for holding the first movable body in a locked state at the first position, and a solenoid that operates by energization based on a fire detection signal to release the locked state between the movable body at the first position and the holding means. It is provided with these. In one aspect, the first movable body includes a face portion, a first upright piece, and a second upright piece. The automatic closing mechanism is located at the center in the width direction of the face portion. Between the first upright piece and the second upright piece, slide shafts are provided in parallel on both sides of the automatic closing mechanism. The first spring is two coil springs respectively mounted on the slide shafts on both sides of the automatic closing mechanism. In one aspect, a wire that constitutes a manual closing mechanism for manually moving the first movable body from the first position to the second position is connected to the first unit. In one aspect, one end of the wire is connected to the holding means, and a manual operation portion is provided on the other end side. The wire is held in a tensioned state when the first movable body in the first position and the holding means are in a locked state. The manual closing mechanism, with the first movable body locked to the holding means, releases the tension of the wire by a first operation of the manual operation portion, slackens the wire, and moves the first movable body and the holding means to the second position. In one aspect, the holding means includes a base slidable between the first position and the second position and a locking portion rotatably provided at the tip of the base. The holding means is provided with a first biasing means for biasing the locking portion in a direction to lock it to the movable body, and a second biasing means for biasing the holding means from the first position to the second position in response to the movement of the movable body when the automatic closing mechanism operates. In one aspect, the first unit includes a first main body in which a first movable body, a first spring, and an automatic closing mechanism are incorporated. The second unit includes a second main body in which a second movable body, a third movable body, and a second spring are incorporated. The first unit and the second unit are assembled by connecting the first main body and the second main body.

[0150] This specification includes In a closing device for a fire shutter in which a movable body in a first position moves in a first direction during a fire to reach a second position and the brake is released. There is disclosed a closing device for a fire shutter, which includes movement restricting means for restricting the movable body from moving in a first direction to a second position when the closing device is installed. In one aspect, the movement restricting means is detachable from the movable body or the device, and is in a first position during installation, and directly or indirectly abuts or locks against the movable body to restrict the movement of the movable body in the first direction. In one aspect, when the movable body abuts or locks against the movement restricting means in the first position, the first position of the movable body is determined. In one aspect, 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 the first direction from the first position to the second position, the slider unit including the third slider and the second spring moves integrally to release the brake of the opening / closing machine. The third slider moves in the second direction toward the first position independently of the second slider by compressing the second spring to restore the brake of the opening / closing machine. The movement restricting means restricts the movement of the second slider in the first direction by abutting against the second slider. In one aspect, the movement restricting means is a first movement restricting means for positioning the second slider in the first position and restricting the movement of the second slider in the first direction from the first position to the second position. There is provided a second movement restricting means for restricting the movement of the second slider in the second direction in the first position. In one aspect, the second slider is movable in conjunction with the movement of a first slider biased in the first direction by a first spring. During a fire, the first slider is configured to move in the first direction from the first position to the second position by the operation of an automatic closing device. During installation, the first slider is in a temporarily fixed position with its movement in the first direction restricted by a third movement restricting means. There is provided 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 alignment means for aligning the interlocking means during construction.

Explanation of Signs

[0151] 1 Shutter curtain 5 Closing device 6 First unit 60 First slider 61 First coil spring 62 Holding means 63 Solenoid 69 Screw for wire attachment 69' Screw for outer wire attachment 7 Second unit 70 Second slider 71 Third slider 72 Second coil spring 75 Spacer (positioning means, movement restricting means) 75' Spacer (positioning means, movement restricting means) 76 Screw (positioning means, movement restricting means) 77 Screw for wire attachment 78 Screw for outer wire attachment 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, which releases the brake of the shutter by an automatic closing device or a manual closing device to allow the shutter curtain to drop by its own weight, and restores the brake upon detecting an obstacle during the self-weight drop to stop the self-weight drop, The closing device includes a manual closing device, an obstacle detection device, and an operating mechanism connected by a manual closing wire and a brake return wire respectively. The brake return wire is connected to a first movable element of the operating mechanism. The operating mechanism is detachable or movable on the operating mechanism. When fixing the brake return wire to the first movable element during construction, a first positioning means is provided at a predetermined position on the operating mechanism to position the first movable element, and after construction, it is removed from the operating mechanism or moved from the predetermined position. By connecting the brake return wire to the first movable element positioned by the first positioning means, the brake return wire is set in an appropriate position. A closing device for a fire shutter.

2. The manual closing wire is connected to a second movable element of the operating mechanism, The operating mechanism is detachable. When fixing the manual closing wire to the second movable element during construction, a second positioning means is provided at a predetermined position on the operating mechanism to position the second movable element, and after construction, it is removed from the operating mechanism. By connecting the manual closing wire to the second movable element positioned by the second positioning means, the manual closing wire is set in a temporary fixing position, and by pulling the manual closing wire from the temporary fixing position, the manual closing wire is set in an appropriate position. The closing device for a fire shutter according to Claim 1.

3. The second movable element is a first slider unit including a first slider biased in a first direction by a first spring, During a fire, by the operation of the automatic closing device, the first slider moves in the first direction from the first position to the second position, The first slider unit is connectable to a manual closing wire that constitutes a manual closing device for manually moving the first slider in the first direction from the first position to the second position. 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 slightly pulled in the second direction from the temporarily fixed position via a manual closing wire, and the manual closing wire is set at an appropriate position. The closing device for a fire shutter according to claim 2.

4. The first movable element is a second slider unit including a second slider movable 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 third slider moves in the first direction from the first position to the second position of the second slider, the third slider moves integrally with the second slider via the second spring to release the brake of the opening / 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 return the brake of the opening / closing machine. A brake return wire for pulling the third slider in the second direction when an obstacle is detected can be connected to the third slider. 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 at an appropriate position. The closing device for a fire shutter according to claim 3.

5. The first positioning means includes a first movement restricting means for positioning the second slider unit at the first position and restricting the movement in the first direction from the first position to the second position. and a second movement restricting means for positioning the second slider unit at the first position and restricting the movement in the second direction from the first position. The closing device for a fire shutter according to claim 4.

6. It is provided with an interlocking means for interlocking the first slider and the second slider. The first positioning means and the second positioning means are alignment means for aligning the interlocking means during construction. The closing device for a fire shutter according to any one of claims 4 and 5.

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