JP2009293332A - Device for preventing rapid unusual descent of shutter curtain of shutter device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for preventing rapid unusual descent of a shutter curtain of a shutter device capable of preventing rapid unusual descent of the shutter curtain uncontrollably due to free rotation of a winding shaft of a chain when a chain is cut off while simplifying a structure of the shutter device. <P>SOLUTION: A first sprocket wheel 11 is attached to the winding shaft for winding and unwinding the shutter curtain, a second sprocket wheel 12 is attached to a driving device for rotating the winding shaft, and the chain 13 is stretched around these sprocket wheels. A contact member 78 coming into contact with the chain 13 is attached to a turning member 75 of a rotation stop means 70, and the rotation stop means 70 is provided with a spring for turning and biasing the turning member 75 onto a side for engaging a protrusion 75B of the turning member 75 with teeth 11A of the sprocket wheel 11 centered on a central shaft 74. The protrusion 75B being an engaging part is engaged with the teeth 11A by cutting-off of the chain 13. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an apparatus for preventing a shutter curtain from rapidly and abnormally falling uncontrollably when a chain for rotating a winding shaft for moving the shutter curtain of a shutter apparatus is cut, for example, It can be used for various shutter devices such as an opening shutter device that opens and closes openings such as doorways and windows with shutter curtains, and a disaster prevention shutter device that forms disaster prevention zones with shutter curtains. is there.

  An opening shutter device for opening and closing an opening such as an entrance / exit with a shutter curtain winds up a shutter curtain whose opening / closing movement direction is vertical, and rotates a winding shaft and a winding shaft. And a first sprocket wheel attached to the winding shaft, a second sprocket wheel attached to the opening / closing machine, and a first sprocket wheel and a second sprocket wheel. And a chain. The driving force of the opening / closing machine is transmitted to the winding shaft via the second sprocket wheel, the chain, and the first sprocket wheel, so that the winding shaft winds up and rotates the shutter curtain, and thereby the shutter. The curtain moves up and down.

  In a shutter device having such a structure, when the chain is cut due to aging or fatigue failure, the winding shaft on which the shutter curtain's own weight acts freely rotates, and the shutter curtain is rapidly out of control. Since the abnormal drop occurs, a means for solving such a problem is shown in Patent Document 1 below.

In Patent Document 1, a ratchet gear, which is a rotating member that rotates integrally with a take-up shaft, is provided in a shutter device, and a contact portion that contacts a chain with a spring that is an urging means is provided on a stationary member of the shutter device. A stopper that has an idler and an engaging portion that can be engaged with the ratchet gear is rotatably provided to prevent rotation of the winding shaft when the chain is cut. By rotating the stopper serving as the means with the spring to the side where the engaging portion engages with the ratchet gear, the engaging portion engages with the ratchet gear. The shutter curtain is prevented from falling rapidly and uncontrollably by free rotation.
Japanese Utility Model Publication No. 2-105494

  According to this prior art, in order to prevent the shutter curtain from dropping rapidly and uncontrollably due to the free rotation of the winding shaft when the chain is cut, the shutter device has a ratchet that rotates integrally with the winding shaft. A special gear must be provided. According to this, the number of members of the shutter device increases and the structure becomes complicated.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a shutter curtain for a shutter device capable of preventing the shutter curtain from rapidly and unintentionally dropping uncontrollably due to free rotation of a winding shaft when the chain is cut while simplifying the structure of the shutter device It is to provide a rapid abnormal drop prevention device.

  A shutter curtain rapid abnormal drop prevention device for a shutter device according to the present invention includes a first sprocket wheel attached to a winding shaft for winding and unwinding a shutter curtain whose vertical direction is the opening and closing movement direction, and the winding A second sprocket wheel attached to a drive device for rotating the spindle, a chain wound around the first sprocket wheel and the second sprocket wheel, and a contact with the chain by a biasing force of a biasing means A mechanism for stopping rotation of the winding shaft by engaging a rotating member that has a contact portion and rotates integrally with the winding shaft with the biasing force of the biasing means when the chain is cut. In the shutter curtain rapid abnormal drop prevention device of the shutter device comprising a rotation stop means having a joint portion, The rotating member is in said first sprocket wheel is characterized in.

  In this apparatus, when the chain is cut, the rotating member for preventing the shutter curtain from rapidly falling abnormally due to the free rotation of the winding shaft when the engaging portion of the rotation preventing means is engaged is the winding member. The first sprocket wheel is attached to the shaft and transmits the driving force of the driving device to the winding shaft via the chain. For this reason, by combining the first sprocket wheel, it is possible to prevent a rapid abnormal drop of the shutter curtain, thereby simplifying the structure of the shutter device.

  The part of the first sprocket wheel with which the engaging part of the rotation stop means engages may be any part of the first sprocket wheel. One example is that the portion of the first sprocket wheel with which the engaging portion of the rotation stop means engages is the tooth of the outer peripheral portion of the first sprocket wheel. According to this, since the teeth are originally formed on the first sprocket wheel, the engagement portion of the rotation stopping means is provided on the first sprocket wheel without providing any special member or part on the first sprocket wheel. Can be engaged.

  Further, the number of first sprocket wheels provided in the shutter device may be one or plural.

  When the number of first sprocket wheels provided in the shutter device is one, the first sprocket wheel connected to the second sprocket wheel attached to the driving device via the chain is connected to the first sprocket wheel when the chain is cut. Then, the engaging portion of the rotation stopping means is engaged.

  When the number of the first sprocket wheels provided in the shutter device is plural, the second sprocket wheels are coaxially coupled and arranged, and one of the first sprocket wheels is the first sprocket wheel. The chain is wound around the sprocket wheel and the second sprocket wheel, and the engaging portion of the rotation stopping means is engaged with the plurality of first sprocket wheels.

  According to this, since the engaging portion of the rotation stopping means engages with the plurality of first sprocket wheels, the load for preventing the shutter curtain rapid abnormal drop from acting on the first sprocket wheel from the engaging portion of the rotation stopping means. Thus, it is possible to more reliably prevent the shutter curtain from rapidly falling down with a large strength.

  Further, the first sprocket wheel, the second sprocket wheel, and the rotation stopping means may be disposed in an exposed state on a bracket that rotatably supports the winding shaft, or these first sprocket wheel and second sprocket wheel. And a rotation stop means are disposed on a bracket that rotatably supports the winding shaft, and a cover for covering the first sprocket wheel, the second sprocket wheel, the chain, and the rotation stop means together with the bracket on the bracket. You may attach a structure.

  According to the latter, for example, even if the shutter device is installed in a building built near the coast, the first sprocket wheel, the second sprocket wheel, the chain, the rotation arranged between the bracket and the cover structure Corrosion of the stop means due to salt damage can be prevented by the bracket and the cover structure, and the first sprocket wheel, the second sprocket wheel, the chain, and the rotation stop means can be protected from an unexpected external force.

  As described above, the first sprocket wheel, the second sprocket wheel, and the rotation preventing means are arranged on the bracket, and the first sprocket wheel, the second sprocket wheel, the chain, and the rotation stopping means are covered with the bracket together with the bracket. When the cover structure is attached, the cover structure includes a member disposed between the bracket and the cover structure and / or a part of the member disposed between the bracket and the cover structure. It is preferable to form at least one window hole for visually recognizing the window.

  According to this, the member disposed between the bracket and the cover structure and / or the portion of the member disposed between the bracket and the cover structure are shielded from the outside by the bracket and the cover structure. Even if it is in a state, since the state of these members and parts can be visually confirmed through the window holes formed in the cover structure, confirmation of the necessity of maintenance work for these members and parts is confirmed. It can be done easily.

  What is visually recognized by the window hole formed in the cover structure is a member disposed between the bracket and the cover structure and / or a part of the member disposed between the bracket and the cover structure. As long as it is arbitrary. One example thereof is the above-described chain, and another example is the above-described first sprocket wheel and the engaging portion of the above-described rotation stopping means facing the first sprocket wheel with a gap therebetween. Still another example is the above-described contact portion of the rotation stopping means.

  The cover structure may be formed by a single member, or the cover structure may be formed by a plurality of cover members, and each cover member may be individually attached to and detached from the bracket. .

  According to the latter, since each cover member can be individually attached to and detached from the bracket, the members that are disposed on the bracket are attached and detached from the cover structure when performing maintenance work, etc. It can be done easily without being affected by

  Further, in the present invention, the contact portion provided in the above-described rotation stopping means and contacting the chain may be of any structure and shape, and an example thereof is a sliding type that slides while the chain contacts. Another example is a rotary type such as a gear that meshes with a chain and rotates as the chain travels.

  Furthermore, the present invention is attached to a first sprocket wheel attached to a take-up shaft for taking up and feeding out a shutter curtain whose vertical direction is the opening / closing movement direction, and a drive device for rotating the take-up shaft. As long as the shutter device includes the second sprocket wheel, and the first sprocket wheel and the chain spanned around the second sprocket wheel, the shutter device can be applied to various shutter devices used for arbitrary purposes. The shutter device may be, for example, an opening shutter device for opening and closing openings such as doorways and windows with a shutter curtain, or a disaster prevention shutter device for forming a disaster prevention zone with the shutter curtain. The shutter device for disaster prevention also includes a shutter device for lifting means for blocking between a space near the lifting means such as an elevator or a staircase and a general indoor space excluding this space with a shutter curtain.

  Further, a member that forms the shutter curtain is also optional, and this member may be a slat, a sheet, a pipe connected to each other by a link member, a net, or a panel. Further, the shutter curtain is not formed of one type of member, but may be formed of a composite of different types of members such as a slat and a sheet.

  According to the present invention, while simplifying the structure of the shutter device, it is possible to obtain an effect that the shutter curtain can be prevented from being rapidly and abnormally lowered uncontrollably by free rotation of the winding shaft when the chain is cut.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated based on drawing. The shutter device according to the present embodiment is an opening shutter device for opening and closing an opening such as an entrance / exit with a shutter curtain whose vertical direction is an opening / closing movement direction.

  FIG. 1 shows a front view of an opening shutter device according to the present embodiment. On the left and right sides of an opening 2 such as an entrance that is opened and closed by a shutter curtain 1 of this shutter device, there are walls and pillars. A pair of left and right guide rails 4 attached to a building housing 3 such as the like are provided, and both end portions in the width direction which is the left and right direction of the shutter curtain 1 are slidably inserted into the guide rails 4. The curtain 1 is guided by the guide rail 4 and moves up and down in the vertical direction. A shutter case 5 is disposed above the opening 2, and a winding shaft 6 to which the upper end of the shutter curtain 1 is coupled is housed in the shutter case 5, and the winding shaft 6 is rotated forward and backward. The shutter curtain 1 opens and closes in the vertical direction by winding and unwinding by the winding shaft 6.

  The take-up shaft 6 is rotatably mounted horizontally on a pair of brackets 7 and 8 that form side members on the left and right sides of the shutter case 5. Further, in the shutter case 5, a first sprocket wheel 11 attached to the winding shaft 6, an opening / closing device 9 serving as a drive device for rotating the winding shaft 6 forward and backward, and the opening / closing device A second sprocket wheel 12 attached to 9, a first sprocket wheel 11, and a chain 13 wound around the second sprocket wheel 12 are accommodated. Since the opening / closing machine 9 is a combination of an electric motor and a brake, and the second sprocket wheel 12 is attached to the drive shaft of the electric motor, the forward / reverse rotation of the drive shaft of the electric motor causes the second sprocket wheel 12 and the chain to rotate. 13. The shutter curtain 1, which is transmitted to the take-up shaft 6 via the first sprocket wheel 11 and thereby inserted vertically through the slit formed in the lower surface portion of the shutter case 5, is in the vertical direction as described above. Move to open and close.

  When the shutter curtain 1 provided at the lowermost part of the shutter curtain 1 reaches the lower surface of the shutter case 5 when the shutter curtain 1 is fully opened, or when the seat board 1A reaches the floor 2A of the opening 2 When the shutter curtain 1 is fully closed, and further, when the shutter curtain 1 is stopped at an intermediate position between the fully open position and the fully closed position, the brake of the opening / closing device 9 is turned on, whereby the shutter curtain 1 is It stops at the fully open position, fully closed position, or midway position. When the “close” button of the switch device (not shown) is turned on while the shutter curtain 1 is stopped at the fully open position or halfway position, the brake is turned off and the electric motor of the opening / closing device 9 rotates in the forward direction. The shutter curtain 1 is fed out from the winding shaft 6 that rotates forward, and the shutter curtain 1 is closed and moved downward. Further, when the “open” button of the switch device is turned on while the shutter curtain 1 is stopped at the fully closed position or halfway position, the brake is turned off and the electric motor of the opening / closing device 9 is rotated in reverse. Therefore, the shutter curtain 1 is wound around the winding shaft 6 that rotates in the reverse direction, and the shutter curtain 1 opens and moves upward. When the shutter curtain 1 that has been closed or moved reaches the fully open position or the fully closed position, the electric motor of the switch 9 is stopped by a signal from a sensor (not shown) that detects these positions, and the switch 9 The brake is turned on. Further, when the “stop” button of the switch device is turned on while the shutter curtain 1 is being closed or opened, the electric motor of the switch 9 is stopped and the brake of the switch 9 is turned on. As a result, the shutter curtain 1 stops at a midway position between the fully open position and the fully closed position.

  As can be seen from FIG. 1, the arrangement position of the opening / closing device 9 with respect to the winding shaft 6 is a front position that is the front side of the winding shaft 6 when the thickness direction of the shutter curtain 1 is the front-rear direction. ing.

  As shown in FIG. 1, the first sprocket wheel 11, the second sprocket wheel 12, and the chain 13 described above are attached to the bracket 7 out of the pair of brackets 7 and 8 constituting the shutter case 5. It is arranged at a close position. Also, a cover structure 10 is attached to the bracket 7 inside the shutter case 5, and between the bracket 7 and the cover structure 10, the first sprocket wheel 11, the second sprocket wheel 12, A chain 13 is arranged. Therefore, the first sprocket wheel 11, the second sprocket wheel 12, and the chain 13 are covered with the bracket 7 and the cover structure 10.

  FIG. 2 is a view showing the bracket 7 and the cover structure 10, and is a side view of the bracket 7 and the cover structure 10 as viewed from the winding shaft 6 side. The cover structure 10 is composed of four first to fourth cover members 21 to 24, and these cover members 21 to 24 are bent sheet metal products like the bracket 7. Of these cover members 21 to 24, the first cover member 21 faces the rear portion of the bracket 7 which is substantially half of the bracket 7 when the thickness direction of the shutter curtain 1 is the front-rear direction. It has an area. The second to fourth cover members 22 to 24 are disposed to face the front portion of the bracket 7, and the second cover member 22 includes an upper portion of the front portion of the bracket 7 and a third portion. The cover member 23 is disposed opposite to the upper and lower intermediate portions of the front portion of the bracket 7, and the fourth cover member 24 is disposed to face the lower portion of the front portion of the bracket 7.

  The first cover member 21 is fixed to the projecting piece portions 7A, 7B, and 7C of the bracket 7 with fixing tools 30 to 32 such as screws, and the second cover member 22 is attached to the projecting piece portions 7B and 7D of the bracket 7. The fourth cover member 24 is fixed to the projecting portions 7C and 7E of the bracket 7 with fixing devices 35 and 36 such as screws.

  FIG. 3 is a view similar to FIG. 2 showing the second to fourth cover members 22 to 24 removed. As shown in FIG. 3, the first cover member 21 is formed with a protruding piece portion 21A that is slightly bent toward the bracket 7 side, and the first cover member 21 is also attached to the bracket 7 at the protruding piece portion 21A. Fastened with a fastening tool 37 such as a screw. Further, as shown in FIG. 2, the third cover member 23 is fixed to the bracket 7 by the fixing device 37, and the third cover member 23 is further moved to the bracket 7 side of the third cover member 23. The projecting piece 23A that is slightly bent is fixed to the second cover member 22 with a fastening member 38 such as a screw, and the third cover member 23 is slightly bent to the bracket 7 side with respect to the fourth cover member 24. In the projecting piece portion 24 </ b> A thus formed, it is fixed to the fourth cover member 24 with a fixing tool 39 such as a screw.

  Further, as shown in FIG. 2, the third cover member 23 is indirectly fixed to the bracket 7 by fixing tools 40 and 41 such as screws. These stoppers 40 and 41 are, as will be described later with reference to FIGS. 3 and 6, the rotation stopper 70 according to the present embodiment that is disposed in the space between the bracket 7 and the cover structure 10. It is also used for this purpose.

  As shown in FIG. 2, the third cover member 23 is formed with three first to third window holes 51 to 53, and the bracket 7 and the cover structure are formed through these window holes 51 to 53. The space between the body 10 can be seen.

  Further, as shown in FIG. 2, the first cover member 21 is formed with a hole 54 through which the central shaft 6A on the bracket 7 side of the winding shaft 6 is exposed. The first sprocket wheel 11 is coupled, and the outer periphery of the end of the center shaft 6A on the winding shaft 6 side is fitted with the winding shaft 6 so that the center shaft 6A and the winding shaft 6 are connected. A coupling portion 6B for connecting and integrating is formed. By coupling and integrating the central shaft 6A and the winding shaft 6 with the coupling portion 6B, the central shaft 6A is rotatably supported by the bracket 7 and is also rotated by the bearing member 20 provided on the first cover member 21. The winding shaft 6 and the first sprocket wheel 11 rotate as a unit around a freely supported central shaft 6A (see also FIG. 1).

  The fourth cover member 24 is formed with a hole 55 through which the shaft member 12A serving as the central axis of the second sprocket wheel 12 is exposed, and the end portion of the shaft member 12A on the opening / closing machine 9 side described above. A coupling portion 12B for connecting and integrating the shaft member 12A and the drive shaft 9A by engaging with the drive shaft 9A (see FIG. 5) of the electric motor of the opening / closing device 9 is formed on the outer peripheral portion. ing. The shaft member 12A and the drive shaft 9A are connected and integrated by the coupling portion 12B, so that the second sprocket wheel 12 has the shaft member 12A (see also FIG. 1) supported rotatably by the bracket 7. As the center, it is rotated by the driving force of the electric motor of the switch 9.

  Further, as shown in FIG. 3, three round rod-like members 56 to 58 extending to the opening / closing machine 9 side are coupled to the bracket 7, and as shown in FIG. 2, the fourth cover The member 24 is formed with through portions 59 to 61 by holes or holes for allowing these rod-shaped members 56 to 58 to penetrate the fourth cover member 24 and reach the opening / closing device 9. 4 and 5 are front views of the bracket 7 and the cover structure 10 of FIG. 2 as seen from the front side of the shutter curtain 1 as in FIG. 1. In FIG. The state which penetrated the 4th cover member 24 and reached the opening / closing machine 9 by the penetration parts 59-61 of FIG. 2 is shown. FIG. 4 shows a state before the opening / closing device 9 is attached, and FIG. 5 shows a state after the opening / closing device 9 is attached.

  As shown in FIG. 4, at the end of the rod-shaped member 56 on the opening / closing machine 9 side, a small-diameter screw shaft portion 56A extending toward the opening / closing machine 9 is formed. Screw holes 57A, 58A extending to the opposite side to the opening / closing machine 9 side are formed at the end on the side.

  In addition, as shown in FIG. 2, the fourth cover member 24 is attached with a round bar-shaped rod-shaped member 62 extending toward the switch 9, and the end of the bar-shaped member 62 on the switch 9 side is A screw hole 62A extending to the opposite side to the opening / closing machine 9 side is formed.

  As shown in FIG. 5, screw members 63 are inserted into holes of the flange portion 9B provided in the opening / closing machine 9, and these screw members 63 are inserted into the screw holes 57A, 58A, 62A of the rod-like members 57, 58, 62. By screwing, the opening / closing machine 9 is attached to the rod-shaped members 57, 58, 62. When this attachment is performed, as described above, the shaft member 12A serving as the central axis of the second sprocket wheel 12 and the drive shaft 9A of the electric motor of the switch 9 are coupled and integrated by the coupling portion 12B. Is done.

  Further, the screw shaft portion 56 </ b> A of the rod-shaped member 56 is used for temporarily holding the switch 9 on the rod-shaped member 56 until the switch 9 is attached to the rod-shaped members 57, 58, 62 by the screw member 63. That is, by inserting the screw shaft portion 56A into the hole 9C of FIG. 5 formed in the flange portion 9B of the opening / closing device 9, the opening / closing device 9 can be temporarily fixed to the rod-shaped member 56. After the stop state, the opening / closing machine 9 is attached to the rod-like members 57, 58, 62 by the screw member 63 inserted into the hole of the flange portion 9B, and the nut 56B is screwed onto the screw shaft portion 56A protruding from the flange portion 9B. And tighten. According to this, since the weight of the switch 9 can be supported by the screw shaft portion 56A of the rod-shaped member 56 until the switch 9 is attached to the rod-shaped members 56 to 58, 62 by the screw member 63 and the nut 56B. The attachment work of the opening / closing machine 9 to the rod-shaped members 56 to 58, 62 can be performed by one worker.

  Of the three rod-like members 57, 58, 62, one rod-like member 62 is provided not on the bracket 7 but on the fourth cover member 24, so the rod-like member 62 is provided on the bracket 7. In such a case, the position where the rod-shaped member 62 is disposed interferes with members (such as the chain 13 and the second sprocket wheel 12 described above in the present embodiment) disposed between the bracket 7 and the fourth cover member 24. Even if it becomes, it can arrange | position the rod-shaped member 62 without this interference.

  As shown in FIG. 3, the bracket 7 is provided with a free rotation of the winding shaft 6 between the first sprocket wheel 11 and the second sprocket wheel 12 due to the weight of the shutter curtain 1 when the chain 13 is cut. A rotation stopping means 70 for stopping and preventing a rapid abnormal drop of the shutter curtain 1 is arranged. For this reason, the first sprocket wheel 11, the second sprocket wheel 12, and the rotation stopping means 70 are arranged on the bracket 7 that rotatably supports the winding shaft 6 together with the bracket 8 shown in FIG. It will be. Further, as shown in FIG. 3, the rotation stopping means 70 is disposed inside the chain 13 that is looped around the first sprocket wheel 11 and the second sprocket wheel 12.

  FIG. 6 shows an enlarged view of the rotation stopping means 70. The rotation stopping means 70 is formed on the base member 72 fixed to the bracket 7 with a plurality of fixing means 71 such as screws, and two are formed on the base member 72, and each of them is directed to the switch 9 side. Column portions 72A projecting in a rod shape toward the winding shaft 6 side, covering members 73 attached to these column portions 72A with the fasteners 40 and 41 described in FIG. 2, and the height of the column portions 72A A rotation member 75 having a thickness dimension corresponding to the thickness dimension and disposed between the base member 72 and the cover member 73 so as to be rotatable about the central axis 74. . The central shaft 74 is supported by the bracket 7 because a hole into which one end of the central shaft 74 is inserted is formed in the bracket 7, and the third cover shown in FIG. Since the member 23 is formed with a hole 76 into which the other end of the central shaft 74 is inserted, the central shaft 74 is also supported by the third cover member 23. That is, the center shaft 74 is supported by the bracket 7 and the third cover member 23 in a both-side supported state. The central shaft 74 is inserted through the cylindrical body 75A of the rotating member 75.

  As shown in FIG. 3, the rotating member 75 is formed with a protrusion 75 </ b> B that protrudes toward the first sprocket wheel 11 at a location facing the first sprocket wheel 11. As shown in FIG. 6, the anti-rotation means 70 is provided with a torsion coil spring 77 serving as an urging means that constantly applies a rotation urging force to the rotation member 75. The spring 77 has the rotation member 75 centered on the central shaft 74 toward the side where the protrusion 75B of the rotation member 75 is engaged with the teeth 11A (see FIG. 3) formed on the outer peripheral portion of the first sprocket wheel 11. Is biased to rotate. One end 77 </ b> A of the spring 77 is locked to the column portion 72 </ b> A of the base member 72, the other end 77 </ b> B is locked to the rotating member 75, and the coil portion 77 </ b> C is wound around the trunk portion 75 </ b> A of the rotating member 75. It has been turned.

  The projecting portion 75B engages with the teeth 11A of the first sprocket wheel 11 when the chain 13 is cut, thereby preventing the winding shaft 6 from rotating freely and preventing the shutter curtain 1 from rapidly falling down. It is an engaging part in the form. This protrusion 75B is preferably formed with a thickness dimension larger than the tooth 11A of the first sprocket wheel 11, and the engagement of the protrusion 75B with the tooth 11A is the same as that of the center of the tooth 11A. It is preferable to set so that the thickness central portion of the portion 75B matches or substantially matches.

  As shown in FIG. 6, a contact member 78 having a channel cross section having an opening 78A is attached to the rotating member 75 so as to be swingable by a pin member 79 such as a screw. As shown in FIG. 3, the chain 13 is inserted into the interior of 78A. In other words, the contact member 78 is disposed so as to straddle the chain 13 with respect to the chain 13, and is a slide type in which the chain 13 can slide. 7 is a cross-sectional view taken along line S7-S7 in FIG. 6. As shown in FIG. 7, the inside of the opening 78A slides on the inner surface of the opening 78A of the contact member 78. As shown in FIG. A sliding body 80 is attached to reduce contact friction with the chain 13 so that the chain 13 can smoothly pass through the opening 78A.

  The sliding body 80 according to the present embodiment includes one of side portions 78B and 78C on both sides forming a contact member 78 having a channel-like cross section and a connecting portion 78D connecting these side portions 78B and 78C. The first sliding member 81 disposed on the side portion 78B and the connecting portion 78D, and the second sliding member 82 disposed on the other side portion 78C. These sliding members 81, 82 include the sliding member 81, Since the projections 81A and 82A provided on the 82 are press-fitted into the holes 78E and 78F formed in the side portions 78B and 78C, the sliding members 81 and 82 are detachable from the contact member 78, in other words, exchanged. It is attached freely.

  That is, when the sliding members 81 and 82 are worn more than a predetermined amount due to contact with the traveling chain 13, the sliding members 81 and 82 can be exchanged. Further, by removing the sliding member 82 from the contact member 78, it is possible to perform an operation for confirming that the protrusion 75B of the rotating member 75 is engaged with the teeth 11A of the first sprocket wheel 11. ing. For this reason, the thickness dimension of the sliding member 82 is such that the protrusion 75B separated from the teeth 11A of the first sprocket wheel 11 is formed on the teeth 11A by the rotation of the rotation member 75 about the center shaft 74. The dimension corresponding to the rotation stroke of the rotation member 75 until it is engaged or a dimension larger than this is set.

  The sliding members 81 and 82 are made of, for example, a hard synthetic resin such as urethane, and these sliding members 81 and 82 may be made of an oil-containing hard synthetic resin. Moreover, you may form the sliding body 80 by one sliding member.

  Further, as shown in FIG. 6, the sliding members 81 and 82 are inclined obliquely outward at the ends on both sides in the running direction of the chain 13 from the inside to the outside of the opening 78 </ b> A of the contact member 78. Tapered portions 81B, 81C, 82B, and 82C are formed. Therefore, when the first sprocket wheel 11 and the second sprocket wheel 12 described above rotate forward and backward and the chain 13 travels, the chain 13 can smoothly enter and exit the opening 78A of the contact member 78.

  The contact member 78 described above is a contact portion that comes into contact with the chain 13 in the rotation stopping means 70 of the present embodiment, and the sliding member 82 of the contact member 78 is brought into contact with the chain 13 by the spring 77 shown in FIG. It is urged to the side to do. Since the contact member 78 is swingably connected to the rotating member 75 by the pin member 79, the contact member 78 can follow the swinging motion of the chain 13.

  The urging force of the torsion coil spring 77 is always applied to the rotating member 75 of the rotating means 70. This urging force is applied to the rotating member 75 and the contact member 78 in FIGS. The contact member 78 contacts the chain 13 which is an endless chain via the sliding body 80 from the outside to the inside because it is intended to rotate in the clockwise direction around the center shaft 74. ing.

  In addition, since the contact member 78 is pressed against the chain 13 from the outside to the inside via the sliding body 80 by the torsion coil spring 77 in this way, the chain 13 causes the first and second sprockets to be pressed by this pressing force. The wheels 11 and 12 are deeply engaged, whereby the tension of the chain 13 during normal operation is ensured and the chain 13 is prevented from coming off from the first and second sprocket wheels 11 and 12.

  The arrangement position of the contact member 78 is a position that does not interfere with the second sprocket wheel 12 even after the chain 13 is cut.

  As shown in FIG. 3, the bracket 7 is attached with a sensor 85 that operates when the chain 13 is cut and transmits a signal related to the cutting of the chain 13. An activation member 86 for activating the movable portion 85A of the sensor 85 is attached to the rotation member 75 of the rotation stop means 70. As shown in FIG. 6, the activation member 86 includes an arm portion 86A having a base end portion fixed to the rotating member 75 with a fixing device 87 such as a screw, and a distal end portion of the arm portion 86A. And an activation unit 86B provided. In FIG. 3, when the chain 13 is cut, the rotating member 75 rotates in the clockwise direction around the central axis 74, so that the starting portion 86B comes into contact with the movable portion 85A of the sensor 85 and this movable portion 85A. As a result, a signal relating to the cutting of the chain 13 is transmitted from the sensor 85.

  Further, as shown in FIG. 3, a guard member 88 made of an angle member is attached to the bracket 7 outside the chain 13 that is looped around the first sprocket wheel 11 and the second sprocket wheel 12. Yes. As will be described later, the guard member 88 is used for the purpose of preventing the chain 13 from jumping outward and damaging the member disposed on the bracket 7 or the like when the chain 13 is cut. It is arranged on the bracket 7. In the present embodiment, two guard members 88 are arranged on both sides of the sensor 85. By arranging the sensor 85 at a position in the vicinity of the second sprocket wheel 12, for example, Instead of the member 88, a guard member having a length longer than one guard member 88 may be attached to the bracket 7.

  As shown in FIG. 2, when the first cover member 21 is attached to the bracket 7, and the second to fourth cover members 22 to 24 are also attached, the above described formed on the third cover member 23. Among the first to third window holes 51 to 53, the position of the first window hole 51 corresponds to the position of the chain 13, and the position of the second window hole 52 is the tooth of the first sprocket wheel 11. 11A corresponds to the arrangement position of the protrusion 75B of the rotation member 75 of the rotation stopping means 70 facing the tooth 11A with a gap, and the position of the third window hole 53 is the rotation stopping means. This corresponds to the arrangement position of the 70 contact members 78. For this reason, the take-up shaft 6 is rotated forward and backward by the electric motor of the opening / closing machine 9 via the second sprocket wheel 12, the chain 13, and the first sprocket wheel 11, and the opening / closing movement of the shutter curtain 1 is performed for a predetermined period. After performing, the opening / closing machine 9 is removed from the rod-shaped members 56 to 58, 62 described above, or the opening / closing machine 9 is disposed at a position corresponding to the fourth cover member 24, and the first to third window holes 51 to 51 are disposed. 53 is formed in the third cover member 23, so that the state of the chain 13 from the first window hole 51, for example, the chain 13 cannot be permitted by not removing the opening / closing machine 9 from the rod-shaped members 56 to 58, 62. It is possible to visually recognize the state of deterioration over time, and the like, through the second window hole 52, the teeth 11A of the first sprocket wheel 11 and the rotating member 75 of the rotation stopping means 70. It is possible to visually confirm whether or not the distance between the protrusion 75B is maintained in an allowable amount within an appropriate range, and the state of the contact member 78 of the rotation stop means 70 from the third window hole 53, In particular, the worn state of the sliding body 80 can be visually recognized.

  When the state that can be confirmed by these visual recognitions has progressed to an unacceptable state, the second to fourth cover members 22 to 24 constituting the cover structure 10 described above are removed from the bracket 7. Thereby, the exchange work of the chain 13, the adjustment work or exchange work of the rotating member 75 of the rotation stopping means 70, the exchange work of the contact member 78 and the sliding body 80, and the like can be performed.

  And the cover structure 10 is comprised by the 1st-4th cover members 21-24, and since these cover members 21-24 can be attached to the bracket 7 separately and can be removed, a cover structure Even if the take-up shaft 6 and the opening / closing device 9 are arranged close to 10, the above adjustment work and replacement work can be performed by removing or not removing the take-up shaft 6 and the opening / closing device 9. Only the cover member necessary for performing the operation can be removed, and these adjustment operations, replacement operations, and the like can be easily performed.

  In particular, the rod-like members 56 to 58 to which the opening / closing device 9 is attached are arranged at positions corresponding to the fourth cover member 24 among the first to fourth cover members 21 to 24. 9 is not removed from the rod-shaped members 56 to 58, and when performing the above adjustment work or replacement work, the first to third cover members 21 to 23, or the second and third cover members 22 and 23, or These operations and the like can be performed by removing the second cover member 22 or the third cover member 23 from the bracket 7.

  Further, when the third cover member 23 is removed, the fasteners 40 and 41 shown in FIGS. 2, 3 and 6 are removed, and these fasteners 40 and 41 are the rotation stop means 70 shown in FIG. Since the cover member 73 is attached to the base member 72, the cover member 73 can be removed by removing the fasteners 40 and 41. Thereby, the rotating member 75 to which the starting member 86 is fixed by the fixing tool 87 of FIG. 6 is exposed. Therefore, adjustment work and replacement work for the rotating member 75 are easily performed. In addition, adjustment work and replacement work for the starting member 86 can be easily performed. Further, the contact member 78 attached to the rotating member 75 by the pin member 79 and the contact member 78 Adjustment work and exchange work for the attached sliding body 80 can be easily performed.

  Note that the fasteners 30 to 37 in FIG. 2 in which the first to fourth cover members 21 to 24 are attached to the bracket 7 and the third cover member 23 are attached to the second and fourth cover members 22 and 24. 2 are the first sprocket wheel 11, the second sprocket wheel 12, the chain 13, and the rotation that are disposed in the space between the bracket 7 and the first to fourth cover members 21 to 24. Since it is arranged at a position where it does not interfere with the stopping means 70, the sensor 85, etc., the attaching operation of the cover members 21 to 24 to the bracket 7 by these fasteners 30 to 39, the second and second of the third cover member 23, The attachment work to the fourth cover members 22 and 24 can be performed without any trouble.

  Furthermore, in the present embodiment, the above-described rotation stopping means 70 includes a base member 72, a cover member 73, a rotation member 75 disposed between the base member 72 and the cover member 73, and the rotation member. The central shaft 74 inserted through the 75 cylindrical body 75A, the contact member 78 attached to the rotating member 75, the starting member 86 attached to the rotating member 75, and the rotating member 75 as the central axis. 74, and a spring 77 that urges the protrusion 75B of the rotating member 75 to engage with the teeth 11A of the first sprocket wheel 11, and one end 77A of the spring 77 is Since the other end portion 77B is locked to the rotating member 75 and the coil portion 77C is wound around the trunk portion 75A of the rotating member 75, the rotation is stopped. The means 70 is entirely unity. It has become of structure.

  For this reason, when performing the whole exchange work etc. of rotation stop means 70, since this rotation stop means 70 can be handled as a unit, exchange work etc. can be performed easily.

  The first sprocket wheel 11, the second sprocket wheel 12, the chain 13, the rotation stop means 70, the sensor 85, and the like described above are the bracket 7 and the first to fourth cover members 21 to 24 attached to the bracket 7. It is in the state covered with the cover structure 10 comprised by this. For this reason, even if the shutter device is installed in a building constructed near the coast, the first sprocket wheel 11, the second sprocket wheel 12, the chain 13 and the like can be prevented from being corroded by salt damage, The first sprocket wheel 11, the second sprocket wheel 12, and the chain 13 can be protected from an unexpected external force.

  In particular, as shown in FIG. 2, the first to fourth cover members 21 to 24 are formed with bent portions 21 </ b> H to 24 </ b> H that are bent toward the bracket 7 side. Since the bent portions 7H to 7K that are bent toward the cover members 21 to 24 are formed at the edges of the first sprocket wheel 11, the second sprocket wheel 12, the chain 13, and the like, the bracket 7 and the cover It is housed in a substantially sealed space formed by the members 21 to 24. For this reason, it is possible to more effectively achieve prevention of corrosion due to salt damage and protection from an unexpected external force with respect to the first sprocket wheel 11, the second sprocket wheel 12, the chain 13, and the like.

  FIG. 8 shows that when the shutter curtain 1 is opened and closed by rotating the winding shaft 6 forward and backward by the electric motor of the opening and closing machine 9, the chain 13 is cut due to, for example, aging deterioration or fatigue failure. Shows the time. In FIG. 8, the second to fourth cover members 22 to 24 are removed and shown for convenience of understanding. When the chain 13 is cut, the tension of the chain 13 disappears, and thereby the rotation of the contact member 78 around the central axis 74 by the spring 77 regulated by the chain 13 is released. The rotating member 75 of the means 70 is rotated clockwise around the central axis 74 in FIGS. 3 and 8 by the spring force of the spring 77. For this reason, the protrusion 75B of the rotating member 75 is engaged with the teeth 11A of the first sprocket wheel 11, and the winding shaft 6 connected to the first sprocket wheel 11 is engaged with the shutter curtain 1 by this engagement. 8 is prevented from freely rotating in the direction A in FIG. 8, and the shutter curtain 1 is prevented from rapidly and abnormally descending uncontrollably.

  The portion of the first sprocket wheel 11 with which the protrusion 75B of the rotating member 75 engages is a tooth 11A on the outer peripheral portion of the first sprocket wheel 11, and this tooth 11A is originally formed on the first sprocket wheel 11. Therefore, the protrusion 75B of the rotating member 75 can be engaged with the first sprocket wheel 11 without providing a special member or part on the first sprocket wheel 11.

  Further, the distance from the rotation center portion of the first sprocket wheel 11 to the teeth 11A of the first sprocket wheel 11 and the center portion of the central shaft 74 serving as the rotation center portion of the rotation member 75 The sum of the distance to the tip of the protrusion 75 </ b> B is longer than the distance from the center of rotation of the first sprocket wheel 11 to the center of the center shaft 74. Further, the line segment drawn from the rotation center portion of the first sprocket wheel 11 to the position where the protrusion 75B engages the teeth 11A is in contrast to the line segment drawn from the rotation center portion of the first sprocket wheel 11 to the central axis 74. Thus, the winding shaft 6 forms an angle opposite to the rotation direction A shown in FIG. For this reason, when the winding shaft 6 tries to rotate in the direction A, the protrusion 75B of the rotating member 75 will engage with the teeth 11A more deeply, and therefore, the winding shaft 6 is prevented from freely rotating. Prevention of rapid abnormal drop of the shutter curtain 1 can be effectively achieved by the rotation stopping means 70.

  In addition, the valley between the teeth 11A of the first sprocket wheel 11 has a round U shape, and the tip of the protrusion 75B that enters this valley also has a round shape. Engaging the protrusions 75B with the teeth 11A is performed by suppressing the generation of concentrated load due to the large contact area, thereby further preventing the first sprocket wheel 11 and the winding shaft 6 from rotating. It can be done reliably.

  Further, when the chain 13 is cut, the starting member 86 connected to the rotating member 75 also rotates about the central shaft 74, and therefore, the starting portion 86B of the starting member 86 is shown in FIG. Activates the movable portion 85A of the sensor 85, whereby the electric circuit for driving the electric motor of the opening / closing device 9 is interrupted by the signal from the sensor 85. That is, when the protrusion 75B of the rotating member 75 is engaged with the teeth 11A of the first sprocket wheel 11, the winding shaft 6 cannot rotate in the direction A in FIG. 8, but the winding shaft 6 winds up the shutter curtain 1. The electric motor of the opening / closing machine 9 is wound around the winding shaft via the first and second sprocket wheels 11 and 12 on which the cut chain 13 is still wound. In order not to rotate 6 in the direction opposite to the A direction, an electric circuit for driving the electric motor is shut off by a signal from the sensor 85.

  Note that the abnormality occurrence notification device may be operated by a signal from the sensor 85 to notify the administrator of the shutter device or people around the shutter device that the chain 13 has been broken.

  When the chain 13 is cut, the guard member 88 prevents the cut chain 13 from jumping outward, so that the members disposed on the bracket 7 and the like are damaged by the chain 13 jumping outward. The guard member 88 can also prevent the broken chain 13 from being detached from the first and second sprocket wheels 11 and 12.

  Further, when the cut chain 13 jumps outward, the jumping delay delays the contact member 78 and the rotation member 75 from rotating about the central axis 74 in the clockwise direction in FIG. May cause a time lag until the protrusion 75B of the rotating member 75 engages the teeth 11A of the first sprocket wheel 11, but the guard member 88 prevents the spring 13 from jumping to the outside. After the chain 13 is cut, the protrusion 75B of the rotating member 75 is instantaneously engaged with the teeth 11A of the first sprocket wheel 11 to prevent the shutter curtain 1 from rapidly falling down by preventing the winding shaft 6 from freely rotating. be able to.

  In the embodiment described above, the arm portion 86A of the activation member 86 passes between the chain 13 and the bracket 7 as shown in FIG. 3, but in the embodiment of FIG. 9, this arm portion 86A. Is passed between the chain 13 and the third cover member 23. Further, as shown in FIG. 3, in the above-described embodiment, the contact member 78 of the rotation stopping means 70 passes between the chain 13 and the bracket 7. However, in the embodiment of FIG. The member 78 is passed between the chain 13 and the third cover member 23. That is, the contact member 78 in the embodiment of FIG. 9 is put on the chain 13 from the third cover member 23 side, and thus the chain 13 is inserted into the opening 78 </ b> A of the contact member 78.

  According to the embodiment of FIG. 9, the chain 13 obstructs the replacement work of the starting member 86, the contact member 78, the sliding body 80, etc. performed by removing the third cover member 23 or the second to fourth cover members 22 to 24. This can be easily done.

  FIG. 10 shows an embodiment in which the number of the first sprocket wheels 111 attached to the take-up shaft is two and these first sprocket wheels 111 are coaxially coupled and arranged. In this embodiment, of the two first sprocket wheels 111, the chain 113 is wound around one first sprocket wheel 111 and a second sprocket wheel connected to the drive shaft of the electric motor of the switchgear. The Further, the rotation member 175 of the rotation stopping means 170 has a size straddling the two first sprocket wheels 111.

  For this reason, when the chain 113 is cut, the protrusions 175B of the rotating member 175 serving as the engaging portions of the rotation stopping means 170 are engaged with the teeth of the two first sprocket wheels 111.

  According to this embodiment, since the protrusion 175B of the rotating member 175 simultaneously engages with the teeth of the two first sprocket wheels 111, the shutter acting on the first sprocket wheel 111 from the protrusion 175B of the rotating member 175. The load for preventing the curtain abnormal fall can be dispersed, and thus, the shutter curtain can be prevented more reliably with a large strength.

  The present invention is used in a shutter device in which a first sprocket wheel is attached to a take-up shaft, a second sprocket wheel is attached to a drive device for rotating the take-up shaft, and these sprocket wheels are connected by a chain. be able to.

FIG. 1 is a front view showing an entire shutter device according to an embodiment of the present invention. FIG. 2 is a side view showing the bracket and the cover structure as seen from the winding shaft side. FIG. 3 is a view similar to FIG. 2 illustrating a state where the second to fourth cover members constituting the cover structure illustrated in FIG. 2 are removed. FIG. 4 is a front view of the bracket and the cover structure shown in FIG. 2 as seen from the front side of the shutter curtain, as in FIG. FIG. 5 is a view similar to FIG. 4 showing a state in which an opening / closing device as a driving device is attached to the rod-like member shown in FIG. 6 is an enlarged view of the rotation stopping means shown in FIG. 7 is a cross-sectional view taken along line S7-S7 in FIG. FIG. 8 is a view similar to FIG. 3 showing when the chain is cut. FIG. 9 is a view similar to FIG. 3 showing an embodiment in which the orientation of the contact member or the like of the rotation stop means shown in FIG. 3 is opposite to the orientation shown in FIG. FIG. 10 is a diagram showing an embodiment in which the number of second sprocket wheels is two.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shutter curtain 6 Winding shaft 7 Bracket 9 Opening and closing machine which is a drive device 10 Cover structure 11, 111 1st sprocket wheel 11A tooth 12 2nd sprocket wheel 13 Chain 21-24 First to fourth cover members 51-53 1st to 3rd window hole 70 Anti-rotation means 75, 175 Rotating member 75B, 175B Projection part 77 as an engaging part 77 Spring as an urging means 78 Contact member as a contact part

Claims (9)

A first sprocket wheel attached to a take-up shaft for taking up and feeding out a shutter curtain whose vertical direction is an opening / closing movement direction, and a second sprocket attached to a drive device for rotating the take-up shaft A wheel, a chain wound around the first sprocket wheel and the second sprocket wheel, a contact portion which contacts the chain by a biasing force of a biasing means, and when the chain is cut, the winding An anti-rotation means having an engaging portion for stopping rotation of the take-up shaft by engaging with a rotating member that rotates integrally with the take-up shaft by the urging force of the urging means. In the shutter curtain rapid abnormal drop prevention device of the shutter device,
The shutter curtain rapid abnormal drop prevention device for a shutter device, wherein the rotating member is the first sprocket wheel.   2. The shutter curtain rapid abnormal drop prevention device according to claim 1, wherein the engagement portion of the rotation stopping means engages with teeth of an outer peripheral portion of the first sprocket wheel. 3. Shutter curtain rapid abnormal drop prevention device.   3. The shutter curtain rapid abnormal drop prevention device for a shutter device according to claim 1 or 2, wherein there are a plurality of the first sprocket wheels that are coaxially arranged and coupled, and one of these first sprocket wheels. The shutter is characterized in that the chain is wound around the first sprocket wheel and the second sprocket wheel, and the engaging portion of the rotation stopping means engages with the plurality of first sprocket wheels. Shutter curtain rapid abnormal drop prevention device.   The shutter curtain rapid abnormal drop prevention device for a shutter device according to any one of claims 1 to 3, wherein the first sprocket wheel, the second sprocket wheel, and the rotation stopping means rotatably support the winding shaft. The bracket is provided with a cover structure for covering the first sprocket wheel, the second sprocket wheel, the chain, and the rotation stopping means together with the bracket. Shutter curtain rapid abnormal drop prevention device for the shutter device to do.   5. The shutter curtain rapid abnormal drop preventing device for a shutter device according to claim 4, wherein the cover structure includes a member disposed between the bracket and the cover structure and / or the bracket and the cover structure. A shutter curtain rapid abnormal drop prevention device for a shutter device, wherein at least one window hole for visually recognizing a portion of a member arranged between the body and the body is formed.   6. The shutter curtain rapid abnormal drop prevention device according to claim 5, wherein what is visually recognized by the window hole is the chain.   7. The shutter curtain rapid abnormal drop prevention device for a shutter device according to claim 5 or 6, wherein the one visually recognized by the window hole is opposed to the first sprocket wheel and the first sprocket wheel. A shutter curtain rapid abnormal drop prevention device for a shutter device, characterized in that: the engaging portion of the rotation stopping means.   8. The shutter curtain rapid abnormal drop prevention device for a shutter device according to claim 5, wherein what is visually recognized by the window hole is the contact portion of the rotation stopping means. Shutter curtain rapid abnormal drop prevention device.     9. The shutter curtain rapid abnormal drop prevention device for a shutter device according to claim 1, wherein the cover structure is constituted by a plurality of cover members, and each of the cover members is individually attached to the bracket. The shutter curtain rapid abnormal drop prevention device of the shutter device characterized by being removable.

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