JP4628883B2 - Architectural shutter sudden descent stop device - Google Patents

Description

  The present invention belongs to the technical field of a sudden descent stop device for an architectural shutter installed in an opening.

  In general, in this architectural shutter, a shutter that is connected to a shutter curtain is rotatably supported by a bracket that is integrally fixed to a housing, and the shutter is moved in accordance with forward and reverse rotation of the winding shaft. Some curtains are configured to open and close the opening. In such a case, when the braking device of the switch breaks down, or when the power transmission chain between the switch and the winding shaft is cut off, the winding shaft is in a free state (a state in which the rotation restriction is eliminated). It is assumed that the shutter curtain suddenly descends (falls) under its own weight.

As a countermeasure to prevent this, it is proposed to provide a fall prevention device (corresponding to the sudden descent stop device of the present invention) that detects the sudden descent of the shutter curtain and stops the winding shaft urgently. As an example, the fall prevention device is composed of a case body fixed to the housing bracket and externally fitted to the take-up shaft, speed increasing means built in the case body, and braking means, and rotation of the take-up shaft. It is known that when the rotational speed of the speed increasing means interlocking with the motor exceeds a predetermined value, the braking body (brake shoe) of the braking means presses against the inner peripheral surface of the case to stop the rotation of the winding shaft. It has been.
JP 2001-32655 A

By the way, in the conventional fall prevention device, when the fall prevention device is operated for some reason, the shutter curtain is urgently stopped. However, the conventional fall prevention device is configured only to urgently stop the shutter curtain. In the case where the administrator cannot determine whether the stop state is caused by the fall prevention device or other causes (for example, electrical or mechanical), and the administrator wants to perform maintenance. First, there is a problem that the cause of the shutter curtain stop must be investigated.
Furthermore, when the shutter device is an electric type, when the fall prevention device is activated and stopped, the shutter curtain is simply stopped in appearance, and the drive control circuit of the switch also operates the operation switch. If there is, the switch can be driven. For this reason, it is also assumed that the user operates the operation switch for opening and closing without knowing that the fall prevention device has been activated. In such a case, if the switch is driven again to close the shutter curtain, a load in the closing direction may act on the braking body in the braking state, which may damage the fall prevention device. These have problems to be solved by the present invention.

The present invention has been created for the purpose of solving these problems in view of the above circumstances, and the invention of claim 1 is based on forward and reverse rotation of a winding shaft supported by a housing bracket. In an architectural shutter in which an opening is opened and closed by a shutter curtain connected to the winding shaft, a braking body is provided between the housing bracket and the winding shaft on the inner peripheral surface of the case body that is supported by the housing bracket in a non-rotating manner. In the provision of a sudden descent stop device that stops the rotation of the winding shaft by being pressed, the stop operation detecting means for detecting the stop operation by the sudden descent stop device is configured to detect the displacement of the case body relative to the housing bracket. It is a thing.
According to a second aspect of the present invention, in the first aspect, the sudden descent stop device includes a speed increasing means for speeding up the rotation of the take-up shift, and a braking operation as the speed of the speed increasing means exceeds a predetermined speed. The apparatus includes a rotation number detecting means for displacing the body toward the case body peripheral surface side, and a lock means for locking the braking state by the braking body.
According to a third aspect of the present invention, in any one of the first or second aspects, the stop operation detecting means is constituted by a strain gauge provided on a connecting member that connects the case body to the housing bracket in a detent shape. It is.
According to a fourth aspect of the present invention, in any one of the first and second aspects, the stop operation detecting means is constituted by a pressure-sensitive sensor provided in a connecting member that connects the case body to the housing bracket in a non-rotating manner. Is.
According to a fifth aspect of the present invention, in any one of the first and second aspects, the case body is configured to be connected to the housing bracket in a state in which a predetermined rotational displacement is freely possible. A micro switch provided between the body side member and the housing bracket side member, and an operating tool that operates the switch lever of the micro switch in conjunction with the rotational displacement of the case body with respect to the housing bracket. is there.

According to the first and second aspects of the invention, it is possible to confirm the stop operation of the take-up shaft by the sudden descent stop device, to facilitate maintenance, and to protect the sudden descent stop device.
According to the invention of claim 3, the detection of the presence or absence of the stop operation of the sudden descent stop device can be configured simply, at low cost, and compactly.
According to the fourth aspect of the present invention, the presence / absence of the stop operation of the sudden descent stop device can be detected simply, at low cost, and compactly.
According to the fifth aspect of the present invention, the presence or absence of the stop operation of the sudden descent stop device can be detected with a mechanical configuration.

Next, a first embodiment of the present invention will be described with reference to the drawings.
In the drawings, reference numeral 1 denotes a shutter curtain of an architectural shutter installed in an opening. The shutter curtain 1 is rotatably provided on a pair of left and right mounting brackets 2 and 3 fixed to a housing above the opening. An upper end portion is connected to the wound winding shaft 4. Further, in FIG. 1, an auxiliary bracket 3a is formed on the right mounting bracket 3 so as to project forward, and an opening / closing machine 5 is provided on the auxiliary bracket 3a. The opening / closing machine 5 and the winding shaft 4 are provided. The transmission chain 5a is suspended between the right end of the switch 5 and the interlocking connection between the switch 5 and the take-up shaft 4 is achieved. When the shutter 5 is driven to rotate based on the operation of the operation switch S provided at the opening, the winding shaft 4 rotates forward and backward, and the shutter curtain 1 is moved from the winding shaft 4. It is set to open and close between the fully closed posture of unwinding and closing the opening and the fully open posture of the shutter curtain 1 being wound around the winding shaft 4 to open the opening. The basic configuration such as that the left and right side portions of the shutter curtain 1 are configured to receive movement guidance by the guide rails 6 provided on the left and right sides of the opening portion is the same as the conventional one.

The take-up shaft 4 has both left and right end portions formed in a narrow diameter portion 4a, which is a driven side with respect to the drive side (right side) on which the opening / closing device 5 is disposed and is close to the left mounting bracket 2. A sudden descent stop device 7 of the present invention is provided in the small diameter portion 4a.
The sudden descent stop device 7 includes a rotating body 8 that is externally fitted to the winding shaft 4, and the rotating body 8 has a key groove 8 a that fits a key 4 b formed on the winding shaft 4. It is formed and is configured to rotate integrally with the winding shaft 4 while being prevented from rotating. At the right end portion of the rotating body 8, lock nut pins 4 c that assist the rotation prevention between the rotating body 8 and the winding shaft 4 are provided at two places in the circumferential direction.

And the speed increasing means 9 is arrange | positioned in the right end part (part distant from the left side attachment bracket 2) of the outer periphery of the rotary body 8. FIG.
The speed increasing means 9 is a base wheel in which an engaging portion 10a that fits into an engaging groove 8b formed on the outer periphery of the rotating body 8 is formed on the inner periphery of a cylindrical speed increasing portion casing 9a. 10, a first planetary gear 11 that is rotatably supported by the base wheel 10 and meshes with gear teeth 9b formed on the inner periphery of the casing 9a, and a first gear that rotates in response to the rotation of the first planetary gear 11. 10b, a second planetary gear 11a that is supported by the first gear 10b and meshes with a gear tooth 9b formed on the inner periphery of the casing 9a, and a second planetary gear 11a that rotates by receiving the rotation of the second planetary gear 11a. A two-gear 10c is internally provided. The rotation from the winding shaft 4 is configured to transmit power to the second gear 10c via the base wheel 10, the first planetary gear 11, the first gear 10b, and the second planetary gear 11a. Thus, the second gear 10c is set to rotate in a state in which the rotational speed of the winding shaft 4 is increased (the rotational speed is increased).
The speed increasing portion casing 9a is covered with a ring-shaped lid 9c fixed to the right end edge, and the right cylinder end is covered with the inner diameter side portion of the cylinder 9d and the rotating body. The bearing 8c is interposed between the outer periphery of the 8 and the winding shaft 4 is configured to be relatively rotatable.

Further, a rotation speed detecting means 12 is provided on the outer periphery of the rotating body 8 and on the left side of the speed increasing means 9. The rotational speed detecting means 12 is composed of a weight body 12a that is divided into a plurality of circumferential directions and is slidably movable in the radial direction with respect to the disk surface of the second gear 10c of the speed increasing means 9. The weight body 12a is configured to slide outward in the radial direction by centrifugal force when the rotation speed of the second gear 10c exceeds a predetermined rotation speed, and on the left side surface of the weight body 12a. Is formed on the inner diameter side so that the protrusion 12b protrudes in the left direction. In addition, 12c is a ring-shaped urging ammunition, and this ring-shaped urging ammunition 12c is set so as to urge the weight body 12c toward the inner diameter side.
The weight body 12a does not slide and move to the outer diameter side even when it is accelerated by the speed increasing means 11 in the rotation of the winding shaft 4 in a state in which the shutter curtain 1 is normally opened and closed. When the centrifugal force due to the rotation of the second gear 10c based on the rotation (rapid descent) of the winding shaft 4 (rotating body 8) exceeding the rotation at the time of the opening / closing operation is received, it resists the urging force of the ring-shaped urging machine 12c. Is set to slide to the outer diameter side.

  A braking means 13 is provided at the left end of the outer periphery of the rotating body 8 and on the left side of the rotational speed detection means 12. The braking portion casing 14 constituting the braking means 13 is formed in a bottomed cylindrical shape that covers the outer periphery of the rotational speed detection means 12 together with the braking means 13, and is inside the small diameter cylindrical portion 14 b formed on the inner diameter side of the bottom portion 14 a. The bearing 8d is interposed between the peripheral surface and the outer periphery of the rotating body 8, so that the rotating body 8 is set to rotate relative to the outer surface. Further, the braking portion casing 14 is integrated with the right end surface 14c being abutted against the left end surface of the speed increasing portion casing 9a, and the speed increasing portion casing 9a, the lid 9c, and the braking portion casing 14 are combined. Although the case body C is configured, the case body C is rotatable relative to the winding shaft 4 (rotating body 8).

  The braking means 13 is configured using a general-purpose centrifugal clutch device, and a pair of brake plates that are opposed to each other in the axial direction and rotate integrally with the rotating body 8 are disposed inside a braking portion casing 14 corresponding to a brake drum. 13a and the brake plate 13a via a swing support shaft 13b so as to be swingable, swinging to the outer diameter side and being displaced to a braking posture, the outer brake surface is changed to the inner periphery of the brake part casing 14. A plurality of brake shoes (corresponding to the braking body of the present invention) 13c that press against the surface are provided in the circumferential direction. These brake shoes 13c are connected to the other end of an urging ammunition 13d fixed to the oscillating support shaft 13b of the adjacent brake shoe 13c, and oscillated toward the inner diameter side by the urging ammunition 13d. It is urged so as to be in a non-acting posture separated from the braking section casing 14.

Further, the braking means 13 includes a recess 13e that is recessed toward the outer diameter side on the inner diameter side surface of the brake shoe 13c, and a recess that is recessed toward the inner diameter side of the rotating body 8 so as to face the recess 13e. A clutch roller 13f having an oval cross section is provided in the space surrounded by 8e, and as described later, the sudden descent stop device 7 is operated to cause the brake shoe 13c to be in a braking posture in the radial direction. The brake shoe 13c is held in the braking posture and the winding shaft 4 is maintained in the stopped state even when the centrifugal force based on the rotation of the brake plate 13a is lost.
Further, the brake shoe 13c is provided with a protrusion receiving piece 13g which is located on the outer diameter side of the protrusion 12b of the rotation speed detecting means 12 and which faces in the radial direction. When the shutter curtain 1 suddenly descends and the rotation of the second gear 10c exceeds a predetermined rotational speed, the auxiliary weight 12a slides to the outer diameter side, and the protrusion 12b biases the protrusion receiving piece 13g. The brake shoe 13c is forcibly displaced to the outer diameter side by being pushed to the outer diameter side against the bullet machine 13d, so that the clutch roller 13f stands up.

In the sudden descent stop device 7 configured as described above, mounting holes 14d are recessed in the left end surface of the bottom portion 14a (case body C) of the braking portion casing 14 at four locations in the circumferential direction.
On the other hand, the left mounting bracket 2 is provided with a bearing member 2b provided with a ring-shaped bearing 2a for bearing the take-up shaft 4 to which the shutter curtain 1 is connected. Although fixed to the shape, the screwing tip 15a of the fixing bolt 15 penetrates the bearing member 2b and protrudes to the right. Then, when the left end portion of the take-up shaft 4 is supported by the bearing member 2b, the screwing tip portion 15a of the fixing bolt 15 is loosely fitted into the case body mounting hole 14d of the sudden descent stop device 7. Is set. In other words, the screwing tip 15a (fixing bolt 15) corresponds to the connector of the present invention, and is set so as to prevent rotation of the case body 14 that is rotatably provided on the rotating body 8. .

  At this time, the outer diameter R1 of the fixing bolt screwing tip 15a is set smaller than the inner diameter R2 of the mounting hole 14d (R1 <R2). The cover body C of the sudden descent stop device 7 has the screwing tip portion 15a positioned substantially at the center of the mounting hole 14d, and therefore, the outer diameter R1 of the screwing tip portion 15a and the inner diameter R2 of the mounting hole 14d. Rotation based on half of the difference ((R2−R1) / 2) (allowable rotation range) is allowed, and for further rotation, the hole edge of the mounting hole 14d hits the screwing tip 15a (fixing bolt 15). As described later, when the braking means 13 of the sudden descent stop device 7 is operated, the cover body C rotates based on the rotation allowable range in the mounting hole 14d, and then rotates. Based on the regulation, the rotation of the winding shaft 4 is set to be braked based on the regulation. Incidentally, the fixing bolt screwing tip portion 15a of the sudden descent stop device 7 is set so as to be attached in a state of being located at a substantially central position (concentric) of the case body attaching hole 14d.

In the normal opening / closing operation of the shutter curtain 1, when the winding shaft 4 rotates forward and backward at a predetermined rotational speed, the speed increasing means 9 rotates with the rotation of the winding shaft 4, but the speed increasing means 9, the second gear 10 c does not reach a predetermined rotational speed, and the auxiliary weight 12 does not slide to the outer diameter side.
Further, in the normal opening operation of the shutter curtain 1, the winding shaft 4 is set to rotate in the arrow X direction as shown in FIG. Along with this, the brake plate 13a and the brake shoe 13c rotate. At this time, the clutch roller 13f is loosely fitted in an inclined posture in which the radially outer side is located on the rear side in the rotational direction. Even if the centrifugal force due to the rotation is received, the clutch roller 13f does not stand up in the radial direction due to the centrifugal force, and since it receives the biasing force of the biasing bullet 13d, the brake shoe 13c is not It is set so that it is held in the acting posture and is not braked by the braking means 13.

On the other hand, in the normal closing operation of the shutter curtain 1, the take-up shaft 4 is set so as to rotate in the counter arrow X direction in FIG. For this reason, the clutch roller 13f receives a centrifugal force in a standing direction by rotating together with the brake plate 13a, but the brake shoe 13c is held in a non-acting posture by receiving the urging force of the urging ammunition 13d. The clutch roller 13f does not stand up and is set so that braking by the braking means 13 is not performed.
Here, in such a state in which the normal opening / closing operation is performed, the speed increasing means 11, the rotation speed detecting means 12, and the braking means 13 of the sudden descent stop device 7 are rotated based on the rotation of the rotating body 8. On the other hand, as described above, the cover body C of the sudden descent stop device 7 is allowed to rotate based on half the difference in diameter between the mounting hole 14d and the fixing bolt screwing tip 15a. For this reason, during the normal opening / closing operation, with the rotation of the speed increasing means 11, between the cover body C and the bearings 8c and 8d bearing the cover body C, the base wheel 10 and the speed increasing portion casing 9a have an inner periphery. Rotational resistance is generated between the gear teeth 9b, and in this case, the load of the case body C exceeds the rotational resistance and the cover body C is not rotated.

On the other hand, when the take-up shaft 4 becomes free from the opening / closing machine 5 due to the transmission chain 5a being cut or the like and suddenly descends based on the weight of the shutter curtain 1, the take-up shaft is increased in the speed increasing means 9. 4 is increased, and the second gear 10c rotates beyond a predetermined rotational speed. Along with this, in the rotation speed detection means 12 provided in the second gear 10c, the auxiliary weight 12a receives a centrifugal force and is forcibly displaced toward the outer diameter side. In this state, the brake shoe 13c of the braking means 13 is forcibly transformed into a braking posture by the auxiliary weight 12a, and the braking surface is pressed against the inner peripheral surface of the case body C. At this time, the clutch roller 13f receiving the centrifugal force due to the rotation of the brake plate 13a in the closing direction (counter arrow X direction) is set up to hold the brake shoe 13c in the braking posture. As described above, when the brake shoe 13c is in the braking posture, the case body C uses the winding shaft 4 as a rotation support shaft, and allows rotation in the mounting hole 14d at the mounting portion between the brake shoe 13c and the left mounting bracket 2. It is configured to rotate based on the range, and thereafter to be subjected to rotation regulation by the fixing bolt 15, whereby the rotating body 8 and the take-up shaft 4 are set to urgently stop the rotation via the brake shoe 13 c. In this state, the clutch roller 13f receives a rotation in the closing direction and fits in a wedge shape between the recess 13e on the brake shoe 13c side and the recess 8e on the rotating body 8 side, thereby braking the brake shoe 13c. The posture is more reliably maintained.
In FIG. 4, the clutch roller 13f rotates in the direction of arrow X in FIG. 4, that is, when the shutter curtain 1 is operated in the opening direction, the clutch roller 13f falls from the standing state to the circumferential direction. 13c is set to return from the braking posture to the non-operating posture while receiving the biasing force of the biasing ammunition 13d.

  A strain gauge 16 for detecting distortion of the screwing tip 15a is attached to any one of the fixing bolt screwing tips 15a that are loosely fitted to the sudden descent stop device 7. The strain gauge 16 measures a load acting on the screwing tip 15a as a resistance value, and the load on the screwing tip 15a changes when the case body C is displaced with respect to the fixing bolt 15. By monitoring the change of the load with the strain gauge 16 that measures the load as a resistance value, the operating state of the sudden descent stop device 7 is set to be detected. That is, the strain gauge 16 is set to detect that the sudden descent stop device 7 has been operated based on the fact that the change value of the measured value (resistance value) is larger than the preset change value. This configuration corresponds to the stop operation detecting means of the present invention. Note that a general-purpose strain gauge 16 is used in the present embodiment, and is fixed to a distal end side of the threaded distal end portion 15a and a portion that fits in the mounting hole 14d of the case body C. .

  A control unit 18 is connected to the detection circuit 17 connected to the strain gauge 16, and the control unit 18 detects when the change value of the measured value from the strain gauge 16 exceeds a preset change value. The controller 18 is set to determine that the sudden descent stop device 7 has been operated. When the sudden descent stop device 7 has been operated, the control unit 18 does not drive the switch 5 based on the operation of the operation switch S. The control circuit opening signal is set to be output to the drive control circuit 19 of the switch 5. Further, when it is determined that the sudden descent stop device 7 has been operated, the control unit 18 outputs a lighting command signal to the notification lamp 20 provided at an appropriate location above the opening so that the notification lamp 20 is turned on. Is set. Thereby, when the sudden descent stop device 7 is activated, the switch 5 is not driven even if the operation switch S is operated, and the sudden descent stop device 7 does not perform the braking operation again. When the notification lamp 20 is turned on, the confirmation that the stop of the shutter curtain 1 is due to the operation of the sudden descent stop device 7 can be obtained immediately.

In this embodiment configured as described, when the shutter curtain 1 suddenly descends (falls) for some reason, the take-up shaft 4 lowers the shutter curtain 1 at a rotational speed exceeding the normal rotational speed. At that time, the take-up shaft 4 is provided with a sudden descent stop device 7, and the rotation speed of the take-up shaft 4 is increased to operate the braking means 13, so that the shutter curtain 1 starts to fall. In addition, the shutter curtain 1 can be prevented from falling while reacting quickly. In this case, as the sudden descent stop device 7 is operated, a control circuit opening signal is output to the drive control circuit 19 of the switch 5, and the drive control circuit 19 is closed even if the operation switch S is operated. It is possible to prevent the shutter curtain 1 from being opened and closed. As a result, when the sudden descent stop device 7 prevents the shutter curtain 1 from falling and stops and the sudden descent stop device 7 is in a braking state, the closing operation is performed again and a load is applied to the brake shoe 13c. Such a situation can be reliably prevented, and the sudden descent stop device 7 can be protected.
In addition, in this case, when the steep descent stop device 7 is operated, the notification lamp 20 for notifying that the stop operation has been performed is turned on, so that the shutter curtain 1 is stopped by the steep descent stop device 7. It can be confirmed immediately and maintenance can be performed efficiently.

  Further, in this device, the sudden descent stop device 7 stops the descent of the shutter curtain 1 based on the increased rotation of the take-up shaft 4, so that the shutter curtain 1 can be quickly and urgently stopped. In addition, since the braking means 13 directly stops the rotation of the winding shaft 4, it is not necessary to further increase the strength of the other members of the sudden descent stop device 7, and the compact sudden descent stop device 7 can be obtained.

  In this case, the stop operation detecting means for detecting the operation of the sudden descent stop device 7 applies a large load by preventing the case body C from rotating when the rotation of the winding shaft 4 is braked by the sudden descent stop device 7. Since it is configured to detect the distortion of the threaded tip 15a of the fixing bolt 15 that acts, the configuration can be simplified, the installation space can be reduced, and further reduction in weight and size can be achieved. it can.

Needless to say, the present invention is not limited to the above-described embodiment, and the first embodiment includes a screwing tip portion of a fixing bolt and a case that is prevented from rotating by the screwing tip portion. A stroke that allows a predetermined rotation is provided between the mounting hole of the body, but a configuration that does not form a rotation allowable stroke between them may be provided. The load changes corresponding to the displacement on the case body side, and the stop operation of the sudden descent stop device can be detected by measuring the change with a strain gauge.
Further, as the stop operation detecting means, a pressure-sensitive sensor may be provided at a screwing tip portion of a fixing bolt as a rotation stopper. In this case, it is possible to detect that the sudden descent stop device has been stopped by a change in the measured value of the pressure sensor. For example, there is a pressure-sensitive conductive elastomer sensor. When such a sensor is used, a member made of elastomer is provided between the fixing bolt and the mounting hole, and the pressure of the member is detected. By doing so, the operation of the sudden descent stop device can be detected.

Furthermore, it can also be configured as in the second embodiment shown in FIGS.
The basic configuration of the steep descent stop device in the second embodiment is the same as that in the first embodiment, and description of each member is omitted by attaching the same reference numerals.
The sudden descent stop device 7 of the second embodiment has a difference between the outer diameter T1 of the mounting hole 14d provided in the bottom 14a of the case body 14 and the outer diameter T2 of the screwing tip 15a of the fixing bolt 15 ( T1-T2) is configured to be larger than the difference in diameter in the first embodiment.
Of the four mounting holes 14d formed in the cover body C of the sudden descent stop device 7, the switch bracket 21 is integrally provided on the outer peripheral portion facing the one mounting hole 14d so as to protrude to the outer diameter side. Here, a micro switch 22 constituting a stop operation detecting means is provided. The switch lever 22a of the micro switch 22 is arranged with the tip of the swing extending toward the inner diameter side (the outer peripheral surface side of the cover body C), and when the switch lever 22a is displaced toward the outer diameter side, It is set to close the contact.

  On the other hand, a through-hole 14e communicating with the mounting hole 14d is formed in the outer peripheral surface of the cover body C, that is, the outer peripheral surface of the brake casing 14 facing the swinging tip side of the switch lever 22a of the micro switch 22, Further, an operating rod 23 serving as an operating tool for operating the switch lever 22a penetrates through the hole in the hole length direction. The biasing machine 23a, one end of which is connected to the actuating rod 23, is connected to the hole edge of the through hole 14c at the other end so as to hold the actuating rod 23 toward the inner diameter side in a natural state. Is set to In this natural state, as shown in FIG. 9 (A), the operation plate 23b provided at the outer diameter side tip of the operation rod 23 may be in any posture in contact with or away from the switch lever 22a. However, the switch contact is set to be in an open state (OFF state). Furthermore, in this state, the inner diameter side distal end portion of the operating rod 23 is separated from the fixing bolt screwing distal end portion 15a that is a member on the housing bracket side that is loosely fitted in the mounting hole 14d of the sudden drop detecting device 7 in the inoperative state. It is set so that it is located in the part to do.

Then, when the sudden descent stop device 7 is stopped and the winding shaft 4 rotates in the closing direction, and the screwing tip 15a is relatively rotated and displaced in the direction of the arrow in the mounting hole 14, the state shown in FIG. As shown, the inner diameter side tip of the operating rod 23 abuts on the screwing tip 15a, and the operating rod 23 is set to be pushed to the outer diameter side against the biasing ammunition 23a. The operation plate 23b, which is the outer diameter side distal end portion 23, pushes the switch lever 22a to the outer diameter side so that the switch contact of the micro switch 22 is closed (ON state). The tip end portion on the inner diameter side of the actuating rod 23 is formed with a tapered surface 23c so as to be easily moved up by the screwing tip portion 15c, and the switch lever 22a can be smoothly moved up on the outer diameter side surface of the actuating plate 23b. A protrusion 23d is formed to perform the above.
As described above, in the second embodiment, the stop operation detecting means includes the micro switch 22 and the operating rod 23, and the switch contact of the micro switch 22 is closed, so that the sudden descent stop device 7 is It is comprised so that it may detect that it stopped and operated. In addition, when the micro switch 22 is connected to the control unit and the micro switch 22 is detected to be closed, the control circuit opening signal is output to the drive control circuit of the switch and the lighting command signal is output to the notification lamp. In this way, the same effect as in the first embodiment can be obtained.
Furthermore, the stop operation detecting means having a mechanical configuration as in the second embodiment may be provided between the case body and the member on the housing bracket side. For example, a micro switch is provided on the housing bracket. It is also possible to provide an operation rod that operates the switch contact by rotation of the case body between the microswitch and the case body.

It is a schematic perspective view explaining the structure of the shutter for construction. It is a partially cutaway front view explaining the principal part of the shutter for construction. It is sectional drawing of a sudden descent stop apparatus. FIGS. 4A and 4B are a side view of the main part showing the non-operating state of the braking means in the sudden descent stop device, and a side view of the main part showing the braking state, respectively. FIGS. 5A, 5B, and 5C are cross-sectional views illustrating the power transmission state of the sudden descent stop device, respectively. FIGS. 6A, 6B, and 6C are a side view, a front view, and a side view, respectively, of the sudden descent stop device. FIGS. 7A and 7B are an exploded perspective view and a strain gauge control circuit diagram, respectively, of the sudden descent stop device. It is a side view of the sudden descent stop device in the second embodiment. FIGS. 9A and 9B are enlarged side views of main parts for explaining the operation of the stop operation detecting means in the second embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shutter curtain 2 Left side mounting bracket 4 Winding shaft 5 Opening and closing machine 7 Sudden descent stop device 8 Rotating body 9 Speed increasing means 12 Rotation speed detecting means 13 Brake means 13c Brake shoe 14 Brake part casing 14d Mounting hole 15 Fixing bolt 16 Strain gauge 18 Control unit

Claims (5)

  In an architectural shutter in which the shutter curtain linked to the winding shaft opens and closes by the forward / reverse rotation of the winding shaft supported by the housing bracket, the shutter rotates around the housing bracket between the housing bracket and the winding shaft. Stop operation detecting means for detecting a stop operation by the sudden descent stop device in providing a sudden descent stop device that stops the rotation of the winding shaft by pressing the braking body against the inner peripheral surface of the case body supported in a stop shape Is a sudden descent stop device for architectural shutters configured to detect displacement of the case body relative to the housing bracket.   2. The rapid descent stop device according to claim 1, wherein the speed increasing means for increasing the rotation of the take-up shift, and the brake body is moved to the case body peripheral surface side as the speed increased by the speed increasing means exceeds a predetermined rotational speed. A rapid descent stop device for a building shutter, comprising: a rotation number detecting means for displacing the shutter; and a lock means for locking a braking state by a braking body.   3. The architectural shutter sudden descent stop device according to claim 1 or 2, wherein the stop operation detecting means is constituted by a strain gauge provided on a connector for connecting the case body to the housing bracket in a non-rotating manner.   3. The rapid descent stop device for a building shutter according to claim 1, wherein the stop operation detecting means is composed of a pressure-sensitive sensor provided on a connector that connects the case body to the housing bracket in a non-rotating manner. 4. .   3. The case body according to claim 1, wherein the case body is connected to the housing bracket in a state in which a predetermined rotational displacement can be freely made, and the stop operation detecting means includes a member on the case body side and the housing bracket side. A rapid descent stop device for a building shutter, comprising: a micro switch provided between the member and an actuator that operates a switch lever of the micro switch in conjunction with a rotational displacement of the case body relative to the housing bracket.

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