Closing device for fire shutter

Abstract

To provide a closing device for a fire shutter with improved earthquake resistance.SOLUTION: In a closing device, which includes: an automatic closing mechanism having a first slider 60, a first coil spring 61, a holding means 62 and a solenoid 63; and a brake release mechanism that releases the brake of an opening / closing machine in conjunction with the operation of the automatic closing mechanism, the automatic closing mechanism is provided with an earthquake-resistant structure that prevents the engagement between the first slider and the holding means from being released due to large vibrations when the solenoid 63 is out of energization.SELECTED DRAWING: Figure 23

Description

[Technical Field]

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

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

[0003] A fire shutter equipped with such a closing device and a mechanical harm prevention device is disclosed, for example, in Patent Document 1. The automatic closing mechanism in the closing device comprises a slider that is movable between a first position and a second position and is urged by a spring from the first position to the second position, a holding means that engages with the slider to hold the slider at the first position, and a solenoid that is activated by electricity based on a fire detection signal to release the locked state between the slider and the holding means in the first position, and the solenoid is activated upon receiving a signal in the event of a fire to release the locked state between the slider and the holding means, thereby activating the automatic closing mechanism, and the brake is released in conjunction with the operation of the automatic closing mechanism, causing the shutter curtain to descend under its own weight to close the building opening.

[0004] The retaining means is required to reliably release the locked state in the event of a fire, allowing the shutter curtain to descend under its own weight. However, the retaining means is a mechanical means in which the hooking part engages with the slider, and when large vibrations (for example, vibrations caused by shaking during a major earthquake) act on the closing device, there is a risk that the locked state between the hooking part and the slider will be released due to the vibrations, even when there is no fire. In this case, the shutter curtain will descend under its own weight, unnecessarily closing the fire compartment. [Patent Document 1] Patent No. 6570986 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a closing device for a fire shutter with improved earthquake resistance.

[0006] The technical means adopted by the present invention are: a slider that is movable between a first position on a first side and a second position on a second side and is biased from the first position toward the second position by a spring; a retaining means that is engaged with the slider to retain the slider in a first position; a locking state releasing means that is actuated by energization based on a fire detection signal to release the locked state between the slider and the holding means, which are in the first position; an automatic closing mechanism that moves the slider from the first position to the second position in the event of a fire; a brake release mechanism that releases the brake of the opening / closing machine in conjunction with the operation of the automatic closing mechanism; In a closing device comprising: The automatic closing mechanism has an earthquake-resistant structure that prevents the locked state from being released by large vibrations when the locking state release means is not in operation. A fire shutter closing device.

[0007] In one embodiment, the holding means comprises a base that is slidable between a first position and a second position, and a rotary latch body that is rotatably provided on the second side of the base and has a hook portion that engages with the locked portion of the slider, and the rotary latch body is biased in a direction in which the hook portion engages with the locked portion of the slider, The unlocking means rotates the rotary latch body in the locked state in a direction to release the locked state, and thereby unlocks the locked state. The earthquake-resistant structure prevents the engaging portion from coming off the slider due to vibration.

[0008] In one embodiment, the rotary latch body is integrally formed in a U-shape from a pair of side pieces and a flat plate portion that integrally connects the pair of side pieces, A hook portion is formed between the pair of side pieces, extending in the width direction of the flat plate portion, the locked portion extends in a direction perpendicular to the moving direction of the slider, When the rotary latch body is in the locked state, the hooking portion and the locked portion are in line contact with each other. In one embodiment, the hook portion is a peripheral surface of a shaft portion that connects the pair of side pieces.

[0009] In one aspect, the slider has a surface portion and raised pieces on a first side and a second side of the surface portion, and the second side portion of the opening formed in the surface portion extends to be positioned at the pivotal latch body, so that when the slider is in the first position, the surface portion of the slider and the pivotal latch body are maintained in a non-contact state, preventing transmission of vibrations from the slider to the pivotal latch body.

[0010] In one embodiment, a pair of grooves are formed in the second side portion of the opening, both side portions of the hook portion of the rotary latch body are located in the grooves, and the engaged portion is provided on the surface portion, positioned between the pair of grooves.

[0011] In one embodiment, the main body of the closure device is provided with a support member that supports the unlocking means, the support member extends along the holding means, and a second side portion of the support member is located on a second side of the base; The support plate is fixed to the main body at the first side portion and the second side portion with screws, thereby preventing the locked state from being released due to the second side of the support member rising up.

[0012] In one embodiment, the body comprises a bottom wall, a first side wall, and a second side wall; The support member includes a surface portion on which the unlocking means is supported, a first raised piece on a first side of the surface portion, and a pair of second rising pieces rising on the opposite side to the first rising pieces on the second side of the face portion; a pair of connecting pieces extending from each second rising piece to the second side, the first raised piece is fixed to the first side wall of the main body by a first screw; The pair of connecting pieces are fixed to the bottom wall of the main body by second screws. In one embodiment, the head of the second screw is located in the opening of the slider. [Effects of the Invention]

[0013] According to the present invention, it is possible to prevent malfunction of an automatic closing device due to vibrations such as earthquakes. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a schematic front view of an electric shutter device equipped with a safety device. In the drawing, solid lines connecting elements represent electric wires, and dashed lines represent wires. [Figure 2] FIG. 1 is a front view of an entire electric shutter device (with the opening fully closed) equipped with a safety device. [Figure 3] FIG. 10 is a diagram showing a state in which a closing device is attached to an opening / closing machine. [Figure 4] The left figure is a front view of the operation box, and the right figure is a cross-sectional view taken along line AA in the left figure. [Figure 5]5 is a cross-sectional view taken along the line BB in the left diagram of FIG. 4, showing a state in which the recovery lever has been rotated downward. [Figure 6] The upper figure is a plan view of the closing device, and the lower figure is a side view of the closing device. The lower figure shows the state in which the wire W1 is pulled due to obstacle detection. [Figure 7] FIG. 1 is a perspective view of a first unit of the closure device. [Figure 8] FIG. 2 is a diagram showing a main body of the first unit. [Figure 9] FIG. 10 is a diagram showing a first slider of the first unit. [Figure 10] FIG. 10 is a view showing a holding means of the first unit. [Figure 11] 1A and 1B are a plan view, a side view, and a perspective view of a second unit. [Figure 12] FIG. 2 is a diagram showing the main body of the second unit. [Figure 13] FIG. 10 is a diagram showing a second slider of the second unit. [Figure 14] FIG. 10 is a diagram showing a third slider of the second unit. [Figure 15] 1A-1C are plan, side and cross-sectional views of a closure device in a steady state. [Figure 16] 16A and 16B are a plan view, a side view, and a cross-sectional view of the closing device in a state where the automatic closing mechanism is activated from the state of FIG. 15. [Figure 17] 17A and 17B are a plan view, a side view, and a cross-sectional view of the closing device in a state where the obstacle detection means is activated, following the state shown in FIG. 16. [Figure 18] 16A and 16B are a plan view, a side view, and a cross-sectional view of the closing device in a state where the manual closing mechanism is activated from the state of FIG. 15. [Figure 19] 19A and 19B are a plan view, a side view, and a cross-sectional view of the closing device in a state where the obstacle detection means is activated, following the state shown in FIG. 18. [Figure 20] The upper figure shows the closing device in a steady state, the middle figure shows the closing device after the automatic closing mechanism has been activated from the steady state, and the lower figure shows the closing device when an obstacle is detected after the automatic closing mechanism has been activated. [Figure 21]The upper figure shows the closing device (steady state) during power opening and closing, and the lower figure shows the closing device when an obstacle is detected during power descent. [Figure 22] The upper diagram shows the closing device in a steady state, the middle diagram shows the closing device after the automatic closing mechanism has been activated from the steady state, and the lower diagram shows the state after the emergency closing switch has been activated after the automatic closing device has been activated (the wire has loosened, the holding means has slid to the second side and is now engaged with the first slider). In the state shown in the lower diagram, the wire is pulled by the recovery lever to return it to a tensed state, and the automatic closing mechanism returns to the steady state shown in the upper diagram. [Figure 23] 10A and 10B are a side view and a bottom view showing another embodiment (second embodiment) of the first unit. [Figure 24] 23A and 23B are side and bottom views showing another embodiment of the first unit, where the side view shows the side view of FIG. 23 with the first coil spring 61 removed, and the bottom view shows the bottom view of FIG. 23 with the coil spring 66 removed. [Figure 25] 10A and 10B are diagrams showing a locked state of the rotary latch body; [Figure 26] FIG. 2 is a diagram showing a main body of the first unit. [Figure 27] FIG. 10 is a view showing a first slider assembly. [Figure 28] FIG. 10 is a view showing a slider body of the first slider assembly. [Figure 29] FIG. 10 is a view showing a base plate fixed to a slider body of the first slider assembly. [Figure 30] 10 is a view showing a slide holding metal fitting fixed to a base plate fixed to a slider body of the first slider assembly. FIG. [Figure 31] FIG. [Figure 32] 10A and 10B are views showing a rotating body main body constituting a rotating latch body; [Figure 33] FIG. 2 is a view showing a support bracket to which a solenoid is fixed. DETAILED DESCRIPTION OF THE INVENTION

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[0102] [D] Example of improvement of the first unit of the closing device (earthquake-resistant structure) A second embodiment of the first unit 6 will be described with reference to Figures 23 to 33. Overall views of the first unit 6 are shown in Figures 23 and 24. It should be noted that the basic components of the first unit 6 according to the second embodiment and their operations are substantially the same as the components and operations of the first unit 6 already described, and that the above description can be used as appropriate, except for the improvements described below.

[0103] The first unit 6 includes a first slider 60 that is slidable between a first position and a second position, a first coil spring 61 that urges the first slider 60 from the first position toward the second position, and an automatic closing mechanism that slides the first slider 60 from the first position to the second position in response to input of a fire detection signal.

[0104] The automatic closing mechanism includes a holding means 62 that engages with the first slider 60 in the first position and holds the first slider 60 in the first position, and a solenoid 63 (see FIGS. 23 and 24) that is activated by energization based on the input of a fire detection signal from the disaster prevention panel 4b to release the engagement between the first slider 60 in the first position and the holding means 62. As shown in FIG. 25, the holding means 62 is made up of a base 620 that can slide between the first position and the second position, and a rotary latch body 621' that is rotatably provided at the tip (second side) of the base, and the rotary latch body 621' can be engaged with the first slider 60.

[0105] As shown in FIG. 26 , the first unit 6 has a main body 64 including a plate-shaped bottom wall 640 and a first side wall 641 and a second side wall 642 that rise from a first side and a second side of the bottom wall in an opposing relationship. The basic configuration of the main body 64 is the same as that of the main body 64 shown in FIG. 8 , and the description related to the main body 64 shown in FIG. 8 can be used. A pair of slide shafts 65 are provided parallel to each other so as to bridge between the first side wall 641 and the second side wall 642. The first slider 60 is slidable along the slide shafts 65 between a first position and a second position, and a first coil spring 61 is attached to the slide shafts 65. An L-shaped member is fixed to the bottom wall 640 of the main body 64 at a position closer to the first side, and a contact rising piece 643 is provided from the rising portion of the member, and the slide shaft 65 is inserted into the contact rising piece 643.

[0106] 27 and 28, the first slider 60 has a slider main body 60' having a generally U-shaped configuration in side view, which is made up of a plate-like surface portion 600 extending parallel to a bottom wall 640 of a main body 64, a first rising piece 601 and a second rising piece 602 rising vertically and facing each other from a first side and a second side of the surface portion 600, and the slide shaft 65 can be inserted into the first rising piece 601 and the second rising piece 602. An opening 6000 is formed in the approximate center of the surface portion 600, and a locking hole 6001 for the coil spring 67 is formed on the first side of the opening 6000.

[0107] A contact rising piece 643 is provided on the bottom wall 640 of the main body 64 at a position close to the first side, and the first coil spring 61 fitted around the slide shaft 65 has an end on the first side that abuts against the contact rising piece 643 and an end on the second side that abuts against the second rising piece 602 of the first slider 60 (see FIG. 23). 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.

[0108] The basic configuration of the first slider 60 of the first unit 6 according to the second embodiment is the same as that of the first slider 6 shown in FIG. 9 , but there are the following differences. First, the shape of the opening 6000 is different. The opening 6000 shown in FIG. 9 is rectangular, but as shown in FIG. 28 , the opening 6000 according to the second embodiment has a pair of inclined edges 6002 on the second side of the rectangular portion, narrowing the width of the opening 6000, and a pair of grooves 6003 formed at the second end of the opening 6000. The portion between the pair of grooves 6003 forms a protrusion 6004 extending to the first side, and a protrusion 603 is formed at the tip of the protrusion 6004, rising perpendicular to the protrusion 6004 (on the opposite side to the first rising piece 601 and the second rising piece 602). The protrusion 603 is an element of an interlocking means or transmission means for transmitting the sliding movement of the first slider 60 to the second slider 70. The above description can be applied to the interlocking of the first slider 60 and the second slider 70.

[0109] Second, a cross-shaped base plate 604' is fixed to a second side portion of the face portion 600 of the first slider 60. As shown in Fig. 29 , the base plate 604' includes a rectangular portion 6040 fixed along the second side edge of the face portion 600, a protruding piece 605' protruding from the rectangular portion 6040 to the second side, and a portion 6041 protruding from the rectangular portion 6040 to the first side, and an insertion groove 6042 for the protruding piece 603 is formed in the central portion of the rectangular portion 6040. When the base plate 604' is fixed to the slider body 60', the portion 6041 protruding to the first side is located within an opening 6000 formed in the face portion 60 of the slider body 60'.

[0110] A slide holding fitting 606' forming an interlocking portion 606 is fixed to a portion 6041 protruding toward the first side of the base plate 604'. As shown in Fig. 30 , the slide holding fitting 606' is composed of a plate-shaped base 6060' fixed to the portion 6041 protruding toward the first side, and a block portion 6061' that is trapezoidal in side view and rises from the base 6060', and the upper end (the side farther from the base 6060') of a rising vertical surface 6062' of the block portion 6061' forms the interlocking portion 606 that extends across the entire width of the slide holding fitting 606'. The block portion 6061' of the slide holding fitting 606' is positioned between the groove portions 6003 on the second side of the opening 6000, and the rising vertical surface 6062' of the slide holding fitting 606' abuts against the tip of the protrusion 6004 on the second side of the opening 6000.

[0111] The holding means 62 includes a rotatable pivot latch body 621' that engages with the locked portion 606 of the first slider 60, and is slidable between a first position and a second position. The holding means 62 includes a first biasing means (coil spring 66) that biases the pivot latch body 621' in a direction in which it engages with the locked portion 606 of the first slider 60, and a second biasing means (coil spring 67) that biases the holding means 62 with a force that moves it from the first position to the second position in response to the first slider 60 moving from the first position to the second position when the automatic closing mechanism is activated.

[0112] The base 620 of the holding means 62 is located between the surface portion 600 of the first slider 60 and the bottom wall 640 of the main body 64. For the configuration of the base 620, reference can be made to Figure 10 and the description relating to Figure 10.

[0113] The rotary latch body 621' of the holding means 62 is shown in Figures 31 and 32. As shown in Figure 32, the rotary body main body 621'' of the rotary latch body 621' of the holding means 62 is integrally formed in a U-shape from a pair of side pieces 6210 and a flat plate portion 6214 that integrally connects the pair of side pieces 6210, and has a structure that is difficult to deform even when force is applied thereto due to an earthquake or the like. The locking body 621 of the type shown in Figure 10 is made up of two side plates connected by a shaft portion, and if a torsional force is applied to the left and right plates due to the influence of vibration or the like, there is a risk that the latch will not operate normally or will malfunction.

[0114] As shown in FIG. 32, a first hole 6211'', a second hole 6212'', and a third hole 6213'' are formed in each side piece 6210 so as to form the vertices of a triangle. The center of the first hole 6211'' is located on an extension of the flat portion 6214. As shown in FIG. 31, three shafts 6211', 6212', and 6213' extend between the side pieces 6210, positioned at the first hole 6211'', the second hole 6212'', and the third hole 6213'', and the first shaft 6211', the second shaft 6212', and the third shaft 6213' are arranged so as to form the vertices of a triangle in a side view. The rotating latch body 621' is rotatably connected to the rising piece 6202 at the tip of the base 620, with the second shaft portion 6212' as the rotation fulcrum, and the peripheral surface of the first shaft portion 6211' forms a locking portion (hook portion) that locks onto the locked portion 606.

[0115] A connecting piece 625 is connected to the third shaft portion 6213′ of the rotating latch body 621′. As shown in FIG. 31 , the connecting piece 625 is composed of a first portion to which the third shaft portion 6213′ is attached and a second portion located on a first side of the first portion and extending in the height direction, and the second portion is formed with a first hole on a side closer to the third shaft portion 6213′ and a second hole 6251 on a side farther from the third shaft portion 6213′. A pin 6250′ passing through the first hole of the connecting piece 625 is connected to the tip of the shaft portion 630 of the solenoid 63, and one end of a coil spring 66 is connected to the second hole 6251 of the connecting piece 625.

[0116] The holding means 62 has a base 620 positioned between the face 600 of the first slider 60 and the bottom wall 640 of the main body 64, and when the first slider 60 is in the first position, the pivoting latch body 621' is positioned at a second side portion of the opening 6000 of the face 600 of the first slider 60, portions 62101 of a pair of side pieces 6210 supporting both end portions of the second shaft portion 6212' are positioned at the second side portion of the opening 6000 on both sides of the base 6060' of the slide holding fitting 606', portions 62100 of the pair of side pieces 6210 supporting both end portions of the first shaft portion 6211' are positioned at a pair of groove portions 6003, and the peripheral surface of the first shaft portion 6211' is engaged with the engaged portion 606 of the slide holding fitting 606' fixed to the face 600 of the first slider 60 (via the base plate 604'). When the third shaft portion 6213' moves to the first side (the right side in the figure), the rotating latch body 621' rotates in a direction to release the locked state, and when the third shaft portion 6213 is biased toward the second side (the left side in the figure), the locked position is maintained.

[0117] The tip of the shaft 630 of the solenoid 63 is connected to the connecting piece 625 by a pin 6250′ passing through a first hole in the connecting piece 625. The pin 6250′ is located at approximately the same height as the third shaft 6213′ of the side piece 6210 (with respect to the rotation fulcrum of the rotating latch body 621′). When the shaft 630 is pulled toward the first side by energizing the solenoid 63, the third shaft 6213′ of the rotating latch body 621′ is pulled toward the first side via the connecting piece 625, and the rotating latch body 621′ rotates in a direction in which the first shaft (locking portion) 6211′ moves away from the locked portion 606 of the first slide 60, thereby releasing the locked state between the holding means 62 and the first slider 60.

[0118] One end of a coil spring 66 is connected to the second hole 6251 of the connecting piece 625 of the holding means 62, and the other end of the coil spring 66 is connected to an engagement hole 6421 of the second side wall 642 of the main body 64. The coil spring 66 according to this embodiment extends in the sliding direction of the first slider 60 and the holding means 62 (parallel to the first coil spring 61 and the slide shaft 65). The coil spring 66 functions as a first biasing means that maintains the attitude in which the rotating latch body 621′ is engaged with the engaged portion 606 of the first slider 60. The second hole 6251 of the connecting piece 625 to which one end of the coil spring 66 is connected is located away from the second shaft portion 6212' which is the rotation fulcrum of the rotating latch body 621', and the coil spring 66 urges the rotating latch body 621' in a direction pulling it toward the second side via the connecting piece 625, thereby urging the first shaft portion (locking portion) 6211' of the rotating latch body 621' to press it against the locked portion 606, and the attitude in which the first shaft portion (locking portion) 6211' of the rotating latch body 621' is locked to the locked portion 606 of the first slider 60 is maintained.

[0119] In the configuration shown in Figures 9 and 10, when the locking portion 621 of the holding means 62 is in the locked state, the locking portion 621 abuts against the surface portion 600 of the first slider 60, and if large vibrations occur due to an earthquake or the like, the vibrations from the first slider 60 are transmitted to the locking portion 621, which could cause malfunction. In this embodiment, a pair of grooves 6003 are formed in a second side portion of the opening 6000 of the face portion 600 of the first slider 60, and portions 62100 of a pair of side pieces 6210 supporting both end portions of the first shaft portion 6211' of the rotating latch body 621' are positioned in the pair of grooves 6003. As a result, when the rotating latch body 621' is in the locked position, the rotating latch body 621' and the face portion 600 of the first slider 60 are maintained in a non-contact state, and vibrations such as those caused by an earthquake are not transmitted from the first slider 60 to the rotating latch body 621' (see the upper diagram in FIG. 25 and the center right diagram, which is a partially enlarged view of the upper diagram). Furthermore, the grooves 6003 allow the rotating latch body 621' to engage deeply even in a non-contact state, preventing malfunction due to vibrations.

[0120] 9 and 10, the locking roller 6211 of the locking portion 621 of the holding means 62 is engaged with the locked portion 606 by point contact, thereby reducing contact resistance in the locked state. By locking the locking roller 6211 with the side piece 6060 of the locked portion 606 by point contact, contact resistance in the locked state is reduced and the spring force of the first coil spring 61 is increased, while the locked state is smoothly released in the event of a fire, allowing the automatic closing mechanism to exert a greater operating force. However, there is a risk that large vibrations such as those caused by a major earthquake will cause the locking portion 621 to release from its locked state when the automatic closing device is in a non-operating state, causing the shutter curtain to fall due to its own weight. In the second embodiment, the first shaft portion 6211' (hooking portion) of the rotating latch body 621' of the holding means 62 is engaged with the engaged portion 606 by line contact, which, combined with the improved strength of the rotating body main body 621'' of the rotating latch body 621', prevents malfunction due to vibrations such as earthquakes.

[0121] The solenoid 63 has a shaft (plunger) 630 extending in the sliding direction of the first slider 60, and a connecting piece 625 is attached to the tip of the shaft 630, which is connected to a rotating latch body 621' of the holding means 62 via the connecting piece 625. The shaft 630 is a movable shaft, and when current is instantly applied to the solenoid 63 based on the input of a fire detection signal from the disaster prevention panel 4b, the shaft 630 is pulled toward the first side, causing the rotating latch body 621' to rotate in a direction that releases the locked state, thereby releasing the locked state between the first slider 60 and the rotating latch body 621' of the holding means 62. When not energized, the shaft 630 of the solenoid 63 can be pulled out toward the second side.

[0122] A main body 631 of the solenoid 63 is fixed to and supported by a support bracket 632. As shown in Fig. 33, the support bracket 632 is formed from a surface 6320 to which the main body 631 of the solenoid 63 is fixed, a first rising piece 6321 rising from a first side of the surface 6320, a pair of second rising pieces 6322 rising on the opposite side to the first rising piece 6321 on the second side of the surface 6320, and a pair of connecting pieces 6323 extending from each tip of the pair of second rising pieces 6322 to the second side.

[0123] The solenoid 63 has a body 631 fixed to a surface portion 6320 of a support fitting 632, and the shaft portion 630 is positioned between a pair of second rising pieces 6322 and a connecting piece 6323 on the second side of the support fitting 632. An insertion hole 6321' for a screw 6324 is formed in the first rising piece 6321 of the support fitting 632, and an insertion hole 6323' for a screw 6325 is formed in the connecting piece 6323. The first rising piece 6321 at one end (first side) in the length direction of the support fitting 632 is fixed by the screw 6324 to a screw hole 6410 (see FIG. 26 ) in a first side wall 641 of the body 64 of the first unit 6, and the pair of connecting pieces 6323 at the other end (second side) in the length direction are fixed by the screw 6325 to a screw hole 6404 (see FIG. 26 ) in a bottom wall 640 of the body 64. The fixing portions of the pair of connecting pieces 6323 of the support fitting 632 are positioned in the opening 6000 of the first slider 60, and can be connected to the opening 6000 by screws 6325 (see FIG. 23).

[0124] 6, because this support fitting was fixed in a cantilevered manner, there was a risk that the support fitting would float in the event of large vibrations due to an earthquake, causing malfunction when the shaft (plunger) 630 of the solenoid 63 returns in reaction to being pulled out. In this embodiment, by fixing the support fitting 632 to the main body 64 of the first unit 6 on both the first side portion and the second side portion, the support fitting 632 is prevented from floating due to vibration, the shaft 630 is prevented from being pulled out due to vibrations such as an earthquake, and malfunctions caused by the shaft 630 being pulled out can be prevented. [Explanation of symbols]

[0125] 1. Shutter Curtain 5 Closing device 6 Unit 1 60 First slider (slider) 600 area 6000 aperture 6003 Groove 606 Locked part 606´ Slide Retaining Fitting 61 First coil spring 62 Holding means 621´ Rotating latch body 6211´ First shaft part (hook part) 621´´ Rotating body 63 Solenoid (locking state release means) 630 Shaft 631 Main Unit 632 Support bracket 6321 First rising piece 6323 Connecting piece

Claims

1. a slider movable between a first position on a first side and a second position on a second side, and biased by a spring from the first position toward the second position; a retaining means that is engaged with the slider to retain the slider in a first position; a locking state releasing means that is actuated by energization based on a fire detection signal to release the locked state between the slider and the holding means in the first position; an automatic closing mechanism that moves the slider from the first position to the second position in the event of a fire; a brake release mechanism that releases the brake of the opening / closing machine in conjunction with the operation of the automatic closing mechanism; In a closing device comprising: The automatic closing mechanism has an earthquake-resistant structure that prevents the locked state from being released by large vibrations when the locking state release means is not in operation. Fire shutter closing device.

2. the holding means comprises a base slidably movable between a first position and a second position, and a rotary latch body rotatably provided on the second side of the base and having a hooking portion for engaging with the locked portion of the slider, the rotary latch body being biased in a direction in which the hooking portion engages with the locked portion of the slider, The unlocking means rotates the rotary latch body in the locked state in a direction to release the locked state, and thereby unlocks the locked state. The earthquake-resistant structure prevents the engaging portion from coming off the slider due to vibration. A fire shutter closing device according to claim 1.

3. The rotary latch body is integrally formed in a U-shape from a pair of side pieces and a flat plate portion that integrally connects the pair of side pieces, A hook portion is formed between the pair of side pieces, extending in the width direction of the flat plate portion, the locked portion extends in a direction perpendicular to the moving direction of the slider, When the rotary latch body is in a locked state, the hooking portion and the locked portion are in line contact with each other. A fire shutter closing device according to claim 2.

4. the slider has a surface portion and rising pieces on a first side and a second side of the surface portion, and a second side portion of an opening formed in the surface portion extends to be positioned at the rotary latch body, so that when the slider is in the first position, the surface portion of the slider and the rotary latch body are kept in a non-contact state, and vibration transmission from the slider to the rotary latch body is prevented. A fire shutter closing device according to claim 2.

5. a pair of grooves are formed in a second side portion of the opening, both side portions of the hook portion of the rotary latch body are positioned in the grooves, and the engaged portion is provided on the surface portion and positioned between the pair of grooves; A fire shutter closing device according to claim 4.

6. The main body of the closing device is provided with a support member that supports the unlocking means, the support member extends along the holding means, and a second side portion of the support member is located on a second side of the base; The support plate is fixed to the main body at the first side portion and the second side portion with screws, thereby preventing the release of the locked state due to the second side of the support member rising up. A fire shutter closing device according to claim 2.

7. The body includes a bottom wall, a first side wall, and a second side wall; The support member includes a surface portion on which the unlocking means is supported, a first raised piece on a first side of the surface portion, and a pair of second rising pieces rising on the second side of the face portion, opposite to the first rising pieces; a pair of connecting pieces extending from each second rising piece to the second side, the first raised piece is fixed to the first side wall of the main body by a first screw; The pair of connecting pieces are fixed to the bottom wall of the main body by second screws. A fire shutter closing device according to claim 6.

Images