JP2007016430A - Safety device for fire shutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structurally simple and inexpensive safety device for a fire shutter without using an electric means while being installable on an existing or new fire shutter only by performing simple incidental work. <P>SOLUTION: This safety device has a wire-wire winding pulley 17 rotating by interlocking with rotation of a winding shaft 7, a wire 18 having the upper end fixed to the wire-wire winding pulley 17 and suspended and held by installing a lifting piece 22, and a weight 25 passably inserting the wire 18 and arranged above the lifting piece 22. When closing by lowering a shutter curtain 2 by dead weight by releasing restriction of a brake 14, the wire 18 is wound on the wire-wire winding pulley 17 by interlocking with lowering by the dead weight of the shutter curtain 2.When the lifting piece 22 rises, the lifting piece 22 lifts the weight by abutting on the weight 25 from the middle of a rising process, and reduces a load in the lowering direction of the shutter curtain 2 via the wire 18. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fire shutter used in commercial buildings, schools, hospitals, factories, and other buildings and facilities, and more particularly to a fire shutter safety device that prevents an accident that a person gets caught in a fire shutter.

  In recent years, fire shutters are widely used as countermeasures against fires in commercial buildings and schools. A conventional fire shutter has a structure in which the shutter is wound up and stored by being restrained by a brake when released, and is closed by lowering the shutter by its own weight by releasing the restraint of the brake at the time of a fire or inspection.

  In recent years, there has been a serious accident in which children become underlays of fire shutters that have been lowered due to malfunctions and are killed by their loads, and reviewing the safety of fire shutters has become a social problem.

  Conventionally, as a safety measure, it is designed so that the fire shutter does not fall down except at the time of a fire or inspection, but if there is an obstacle directly under the fire shutter when the fire shutter is lowered, There is known a shutter that detects this with a switch and applies a brake to stop the descent (see Patent Document 1).

JP 2000-282769 A

  The conventional shutter shown in Patent Document 1 requires a switch for detecting an obstacle, a control device for controlling a brake, and the like, and even when a fire prevention shutter is newly installed due to a complicated configuration, it is attached to an existing fire prevention shutter. Even if you do, the equipment cost will be high. Moreover, if an electrical or optical detection device or control device is used, it cannot be said that there is no danger of malfunction or the like.

  The present invention aims to solve the above-described conventional problems, and can be attached to an existing or new fire shutter with simple incidental construction without using electrical means. It realizes a safety device for fire shutter with simple structure and low cost.

  In order to solve the above-mentioned problems, the present invention is configured such that the shutter curtain is wound around the winding shaft by the rotational force of the winding motor to open the fire shutter, and this state is restrained and maintained by a brake. A safety device for a fire shutter in a fire shutter that closes the shutter curtain by dropping by its own weight by releasing the restraint of the wire, the wire take-up pulley rotating in conjunction with the rotation of the take-up shaft, and the wire A wire having an upper end fixed to a take-up pulley, attached with a lifting piece, and suspended; and a weight inserted through the wire so as to pass therethrough and disposed above the lifting piece. When the wire is wound around the wire take-up pulley in conjunction with the lowering of the shutter curtain and the lifting piece rises, the lifting piece comes into contact with the weight and lifts up, Providing a safety device for a fire shutter, characterized in that the arrangement for reducing the load descent direction fire shutter through the ear.

  A plurality of weights may be provided along the wire.

  In order to solve the above-mentioned problems, the present invention is configured such that the shutter curtain is wound around the winding shaft by the rotational force of the winding motor to open the fire shutter, and this state is restrained and maintained by a brake. A safety device for a fire shutter in a fire shutter that closes the shutter curtain by dropping by its own weight by releasing the restraint of the wire, the wire take-up pulley rotating in conjunction with the rotation of the take-up shaft, and the wire The upper end is fixed to the take-up pulley, the lifting piece is attached to the lower end and suspended, and the wire is inserted so that it can pass through. One end located above the lifting piece is fixed and the other end is free. A tension spring or a compression spring in a state, and the wire is wound around the wire take-up pulley in conjunction with the lowering of the shutter curtain, When the lifting piece rises, the lifting piece comes into contact with the other end of the tension spring or compression spring to pull or compress, and the load in the downward direction of the fire shutter is reduced via the wire. A safety device for fire shutters is provided.

  A plurality of the tension springs or compression springs may be provided along the wire.

  In order to solve the above-mentioned problems, the present invention is configured such that the shutter curtain is wound around the winding shaft by the rotational force of the winding motor to open the fire shutter, and this state is restrained and maintained by a brake. A safety device for a fire shutter in a fire shutter that closes the shutter curtain by dropping by its own weight by releasing the restraint of the wire, the wire take-up pulley rotating in conjunction with the rotation of the take-up shaft, and the wire A wire whose upper end is fixed to a take-up pulley, a lifting piece attached and suspended, a weight that is inserted so that the wire can pass therethrough, and that is disposed above the lifting piece, and the wire that can pass therethrough A tension spring or a compression spring that is inserted through and is disposed above the lifting piece, the other end being fixed, and the other end being in a free state. When the wire is wound around the wire take-up pulley in conjunction with the lowering of the wire and the lifting piece rises, the lifting piece abuts against the weight and lifts, and when the lifting piece further rises, A safety device for a fire shutter, wherein the weight is in contact with the other end of the tension spring or compression spring and pulled or compressed to reduce a load in the descending direction of the fire shutter via a wire. I will provide a.

  The winding pulley is preferably provided on the winding shaft via a speed reducer.

According to the fire shutter safety device according to the present invention having the above configuration, the following effects are produced.
(1) The basic configuration of the present invention is such that the upper end of the wire is fixed to a conventional wire take-up pulley attached to a take-up shaft and the lower end lifts the weight, or the spring is elastic. Since it is configured to exert a resisting force, the structure is simple, and it can be attached to an existing or new fire shutter by simply performing ancillary construction at low cost.

(2) Since the safety device for fire shutters of the present invention does not use electrical means, there is little possibility of malfunction and the structure is simple, so that maintenance and inspection are easy.

  The best mode for carrying out a fire shutter safety device according to the present invention will be described with reference to the drawings based on the embodiments.

(Overall configuration of fire shutter)
FIG. 1 is a diagram showing the overall configuration of a fire shutter 1 according to the present invention, FIG. 1 (a) is a front view, and FIG. 1 (b) is a side view. The fire prevention shutter 1 includes a shutter curtain 2 that opens and closes a doorway of a building, and a winding device 3 that is disposed above the shutter curtain 2 and winds up the shutter curtain 2. Note that W is a fire wall of the building, and S is a ceiling wall of the building.

  As shown in FIG. 1A, the shutter curtain 2 may be a metal curtain formed by connecting a plurality of slats 1, a cloth-like flexible member having fire resistance, and a weight at the lower end thereof. It may be a curtain with a structure. In the following embodiments, a description will be given using a metal curtain formed by connecting a plurality of slats 4 together.

  Left and right guide rails 5 for guiding the shutter curtain 2 are disposed on both sides of the entrance of the building. The left and right guide rails 5 have concave grooves on the inner surfaces facing each other. The left and right edge portions of the shutter curtain 2 are slidably fitted in the recessed grooves of the guide rail 5, thereby being guided up and down in the vertical direction.

  As illustrated in FIGS. 1A and 1B, the winding device 3 includes a winding case 6, a winding shaft 7 that is rotatably disposed in the winding case 6, and a winding shaft drive shaft 8. A driven sprocket 9 fixed to the take-up shaft drive shaft 8, a drive-side sprocket 10, a chain 11, a take-up motor 12, a speed reducer 13, a brake 14, and a control device 15. Yes.

  The winding motor 12 rotationally drives the winding shaft drive shaft 8 via the speed reducer 13, the driving side sprocket 10, the chain 11, and the driven side sprocket 9, thereby rotating the winding shaft 7. The winding shaft 7 is attached to the upper end of the shutter curtain 2 and winds up (winds up) the shutter curtain 2 by the driving force of the winding motor 12.

  The brake 14 is provided adjacent to the take-up motor 12 and has a function of restraining the rotational force of the rotary shaft of the take-up motor 12 and a function of releasing this restraint. The structure of the brake 14 is well known and will not be described here. For example, the structure is such that the rotating shaft of the take-up motor 12 is constrained by an electromagnet and can be released.

  In a normal time that is not during a fire or inspection, the fire shutter 1 is open, the shutter curtain 2 is wound up by the winding motor 12 and stored in the winding case 6, and the winding motor is driven by the brake 14. The rotation axis of 12 is restricted so that the shutter curtain 2 does not descend.

  When checking the raising / lowering of the shutter curtain 2 during normal inspection, or when a fire occurs and the smoke is detected by a smoke detector or when heat is detected by a heat detector, the restraint by the brake 14 Is released, the shutter curtain 2 is lowered by its own weight, and the fire shutter 1 is closed. In this closed state, the rotation shaft of the winding motor 12 is again restrained by the brake 14.

  With only the fire shutter 1 having the above configuration, when a shutter curtain 2 is lowered in an emergency such as a fire, if a person such as a child is sandwiched between the shutter curtain 2 and the floor 21, an extremely dangerous accident occurs. Therefore, in order to prevent such an accident, the fire shutter 1 is provided with the fire shutter safety device 16 according to the present invention.

  The fire shutter safety device 16 includes a wire take-up pulley 17 attached to the take-up shaft drive shaft 8 (the wire take-up pulley 17 may be attached via a speed reduction mechanism not shown), and the wire take-up pulley. 17 includes a wire 18 having an upper end (base end) fixed to 17 and a load reduction mechanism 19. Here, the load reduction mechanism 19 is a mechanism for reducing the load in the descending direction of the shutter curtain 2, and is provided in the box 20. Hereinafter, the basic configuration, operation, and the like of the fire shutter safety device 16 will be sequentially described.

(Basic configuration and operation of safety device for fire shutter)
FIGS. 2A to 2C are diagrams schematically illustrating the basic configuration and operation of the fire shutter safety device 16 attached to the fire shutter 1. 2 (a) to 2 (c), as already described with reference to FIG. 1, winding is performed via the speed reducer 13, the driving side sprocket 10, the chain 11, and the driven side sprocket 9 by the driving force of the winding motor 12. The shutter curtain 2 can be wound up by driving the take-up shaft drive shaft 8 and rotating the take-up shaft 7.

  In a state where the shutter curtain 2 is wound around the winding shaft 7 (see FIG. 2A), the rotating shaft of the winding motor is restrained by the brake 14 and the shutter curtain 2 is maintained in the wound state. In an emergency such as a fire, the shutter curtain 2 can be lowered by releasing the restraint of the brake 14 (see FIGS. 2B and 2C).

  2A to 2C, a wire take-up pulley 17 is coaxially fixed to the take-up shaft drive shaft 8. In the basic configuration shown in FIG. 2, in order to simplify the description, the winding shaft drive shaft 8 will be described with a configuration in which a wire winding pulley 17 is attached without using a speed reduction mechanism. As a configuration in which the wire take-up pulley 17 is attached to the drive shaft 8 via a speed reduction mechanism, the wire take-up pulley 17 may be rotated at a reduced speed with respect to the take-up shaft 7.

  An upper end (base end) of the wire 18 is fixed to the wire take-up pulley 17 and wound. The lower end (tip) of the wire 18 enters the box 20 and is suspended to the vicinity of the floor 21 of the building in a state where the shutter curtain 2 is wound around the winding shaft 7 as shown in FIG. ing. A lifting piece 22 is attached to the tip (lower end) of the wire 18 and is hung.

  A weight mounting shelf 23 is provided in the box 20. The weight mounting shelf 23 has a gap 24 through which the lifting piece 22 passes. A weight 25 is placed on the weight placing shelf 23. The weight 25 has a through hole 26 in the vertical direction, and the wire 18 can move up and down through the through hole 26, but the lifting piece 22 is configured so that it cannot pass through the through hole 26.

  Now, when the restraint by the brake 14 on the rotating shaft of the winding motor 12 is released, the shutter curtain 2 descends by its own weight, the wire winding pulley 17 starts winding the wire 18, and the wire 18 passes through the weight 25. It moves upward through the hole 26 and raises the lifting piece 22.

  Then, as shown in FIG. 2B, when the shutter curtain 2 is lowered downward to some extent, the lifting piece 22 comes into contact with the weight 25 and starts to lift, and the weight 25 is raised. The shutter curtain 2 shown in 2 (c) is continued until the lower end of the shutter curtain 2 reaches the floor 21 through the vicinity of the floor 21. In short, when the shutter curtain 2 is lowered and lowered halfway, that is, when it hits a person, the lifting piece 22 begins to lift up against the weight 25, and the weight 25 is raised. Continue during the process of the lower end reaching the floor 21.

  Thereby, the lowering speed of the shutter curtain 2 through the process until the lower end of the shutter curtain 2 reaches the floor 21 from the middle of the lowering of the shutter curtain 2 (after the lifting piece 22 comes into contact with the weight 25 and starts to lift). And the load in the downward direction of the shutter curtain 2 is reduced. As a result, when the shutter curtain 2 is lowered, it does not receive a large load even if a person is caught, so that it is prevented from being injured.

  The weight W of the weight 25 is designed so that the lowering of the shutter curtain 2 is maintained and does not stop even when the lifting piece 22 starts to lift the weight 25 as described above. That is, the weight W of the weight 25 is set to be slightly smaller than the upward force F applied to the wire 18 whose upper end is fixed to the wire take-up pulley 17 by the dead weight of the shutter curtain 2. In addition, although the weight W of the weight 25 is mentioned later, it is good also as a structure which can be adjusted.

(Specific configuration and action of safety device for fire shutter)
FIGS. 3A to 3C are diagrams illustrating a specific configuration of the safety device for fire shutters. In FIG. 1C, the inside of the box 20 of the safety device 16 for fire shutters is viewed from the side. It is the drawing which saw.

  3A to 3C, the winding shaft drive shaft 8 is moved by the winding motor 12 through the driving sprocket 10, the chain 11, and the driven sprocket 9 as described in FIGS. The shutter curtain 2 is configured to rotate at a reduced speed, thereby rotating the winding shaft 7 and winding up the shutter curtain 2. A wire take-up pulley 17 is attached coaxially with the driven sprocket 9, and a wire 18 having an upper end fixed to the wire take-up pulley 17 is inserted into the box 20.

  The box 20 stands on the floor 21 and is disposed directly below the wire take-up pulley 17. The box 20 has a partition wall 27 formed approximately in the middle in the front-rear direction, and is partitioned into a pulley chamber 28 and a loading chamber 29 (a chamber for loading a downward load on the wire 18) except for the upper portion.

  Two pulleys, a first guide pulley 31 and a second guide pulley 32, are mounted on the bottom wall 30 of the box 20 with a U-shaped bracket 33. A third guide pulley 35 is mounted on the upper wall 34 of the box 20 with a U-shaped bracket 36, and a fourth guide pulley 37 is suspended.

  The wire 18 whose upper end is fixed to the wire take-up pulley 17 enters the box 20 through a through hole 38 formed in the upper wall 34 of the box 20, and as shown in FIGS. The first guide pulley 31, the second guide pulley 32, the third guide pulley 35, and the fourth guide pulley 37 are sequentially spanned. Further, as shown in FIG. 3A, the lower end of the wire 18 is suspended to a lower position in the loading chamber 29, and the lifting piece 22 is attached.

  A weight placing shelf 23 is provided in the loading chamber 29, and the weight 25 is placed on the weight placing shelf 23. A through hole 26 is formed in the weight 25, and the wire 18 hangs into the loading chamber 29 through the through hole 26. In the weight mounting shelf 23, a gap 24 through which the lifting piece 22 passes is formed.

Action:
The operation of the fire shutter safety device constructed as above will be described. As shown in FIG. 3A, in a state where the shutter curtain 2 is wound around the winding shaft 7 and is restrained by a brake, the lower end of the wire 18 is suspended to a lower position in the loading chamber 29, The lifting piece 22 is near the bottom wall 30 of the box 20.

  When the restriction of the motor rotation shaft by the brake 14 is released in the event of a fire and the shutter curtain 2 is lowered, the wire 18 is taken up by the wire take-up pulley 17 and pulled upward. Then, the wire 18 is guided by the first to fourth guide pulleys 31, 32, 35, and 37, and the lifting piece 22 at the lower end is raised. In the middle of this ascending process, the lifting piece 22 comes into contact with the weight 25 and begins to lift the weight 25 as shown in FIG.

  Thus, the lower end of the shutter curtain 2 is moved from the middle of the lowering of the shutter curtain 2 (after the lifting piece 22 comes into contact with the weight 25 and starts to be lifted) as shown in FIG. In the lowering process until it comes into contact with the surface 21, the speed is reduced and the load applied to the lower part (downward direction) of the shutter curtain 2 is reduced, and the entire load of the shutter curtain 2 is not applied to the person. Even if it is damaged, it can prevent injury.

  FIGS. 3D and 3E are diagrams illustrating a configuration that allows the weight 25 to be adjusted with the adjustment weight 39. As shown in FIG. 3 (d), the adjustment weight 39 is formed with a groove 40 that is open to the side and into which the wire 18 can be inserted from the side surface, and a recess 41 or a protrusion is formed on the lower surface thereof. ing. On the other hand, as shown in FIG. 3E, a convex portion 42 or a concave portion is formed on the upper surface of the weight 25 corresponding to the concave portion 41 or the convex portion of the adjustment weight 39.

  If the descent load of the shutter curtain 2 cannot be sufficiently reduced even when the weight 25 acts, as shown in FIG. 3 (e), an adjustment weight 39 having a weight smaller than that of the weight 25 is used. The concave portion 41 or the convex portion is fitted on the convex portion 42 or the concave portion of the weight 25. Thereby, the weight of the weight 25 can be adjusted without the adjustment weight 39 falling off the weight 25.

  That is, in order to adjust the weight W of the weight, the weight 25 is set to the basic weight Wo, which is placed on the weight placing shelf 23, and the weight 39 for adjusting the weight w1 is placed thereon. It is possible to adjust the weight weight W = Wo + w1. Similarly, if a plurality of adjustment weights having weights w2, w3,... Wn are prepared, and one or more of them are appropriately selected and added to the weight 25, the weight can be adjusted more finely. .

  In the first embodiment, the winding shaft drive shaft 8 has been described with a configuration in which the wire take-up pulley 17 is attached to the take-up shaft drive shaft 8 without using a speed reduction mechanism. The wire take-up pulley 17 may be configured to rotate at a reduced speed with respect to the take-up shaft 7 as a configuration in which the wire take-up pulley 17 is attached to the wire 8 via a speed reduction mechanism. The configuration regarding this point will be described in detail in a fifth embodiment.

(Modification)
FIGS. 4A and 4B are diagrams illustrating a first modification of the first embodiment, and FIGS. 4C and 4D are diagrams illustrating a second modification of the first embodiment. In these modified examples 1 and 2, a plurality of weight mounting shelves are provided at intervals in the vertical direction of the loading chamber 29, and a plurality of weights having different weights are provided on each of the plurality of weight mounting shelves. It features a configuration in which a weight is placed.

  In Modification 1, as shown in FIGS. 4A and 4B, a lower weight mounting shelf 43, a middle weight mounting shelf 44, and an upper weight mounting shelf 45 are provided. The lower weight 46, the middle weight 47, and the upper weight 48 are placed on the weight mounting shelf. The ratio of the weight of each of the weights 46, 47, 48 to the sum of the weights of the plurality of weights 46, 47, 48 is in order from the lower weight 46, for example, 80%, 15%, 5%. It is good to lighten one by one toward the weight 48.

  In this configuration, the gap 49 between the lower weight mounting shelves 43 is wider than the lifting piece 22 so that the lifting piece 22 can pass therethrough. The gap 50 of the intermediate weight mounting shelf 44 is configured to be wider than the lower weight 46 so that the lower weight 46 can pass therethrough. Further, the gap 51 of the upper weight mounting shelf 45 is wider than the middle weight 47 so that the middle weight 47 can pass therethrough.

  According to the first modified example, when the restriction of the motor rotation shaft by the brake 14 is released in the event of a fire and the shutter curtain 2 is lowered, the lifting piece 22 starts to rise and the rising process is continued as in the first embodiment. From the middle, the lifting piece 22 comes into contact with the lower weight 46 and lifts, and as shown in FIG. 4B, the lower weight 46 comes into contact with the middle weight 47, and the middle weight The weight 47 abuts on the upper weight 48 (indicated by a dotted line in FIG. 4B), and lifts the weight one after another.

  Thereby, in the descent process until the shutter curtain 2 abuts against the surface of the floor 21 from the middle of the descent of the shutter curtain 2 (after the lifting piece 22 abuts against the lower weight 46 and starts to lift), the descent speed Is gradually reduced, and the load applied to the lower side of the shutter curtain 2 is subtracted by an amount corresponding to the ratio of the weights of the respective weights to be reduced stepwise.

  That is, when the load applied downward when the shutter curtain 2 descends is F and the sum of the weights of the lower weight 46, the middle weight 47, and the upper weight 48 is W, the shutter curtain 2 The load at the time of lowering becomes F−0.8 W at which the lifting piece 22 starts to lift the lower weight 46, and when the middle weight 47 starts to lift as shown in FIG. 4B, F− It becomes 0.95W, and as shown in FIG. 4D, when the upper weight 48 starts to be lifted, it is reduced to become FW.

  As a result, in the lowering process of the shutter curtain 2, the lowering weight 46 is first lowered without reducing the speed corresponding to 100% of the weight of the weight 25, and the lower weight 46 is first lifted in the middle of the lowering. Even if an adult is sandwiched while the shutter curtain 2 is still high above the floor 21, a load obtained by subtracting the weight of 85% of the total weight is applied, so that injuries and the like can be prevented. Furthermore, even when the shutter curtain 2 is relatively close to the upper side of the floor 21 and sandwiches a small child, a load equivalent to 95 to 100% of the weight of the weight 25 is applied, so that an injury or the like is caused. Can be prevented.

  In the second modification, as shown in FIG. 4C, a lower weight placing shelf 43 and an upper weight placing shelf 45 are provided, and different weights are respectively provided on these weight placing shelves. A lower weight 46 and an upper weight 48 are placed. A lower through hole 52 and an upper through hole 53 for passing a wire are formed in the lower weight 46 and the upper weight 48, respectively. The wire 18 has a lifting piece 22 at its lower end and a lifting piece 54 above it. The lifting piece 54 has a size that passes through the lower through hole 52 but does not pass through the upper through hole 53.

  According to the second modification, when the shutter curtain 2 is lowered, as shown in FIG. 4 (d) in the event of a fire, the lifting piece 54 is moved slightly after the lifting piece 22 lifts the lower weight 46. Since the upper weight 48 is lifted, the speed of the shutter curtain 2 and the downward load can be reduced step by step (in this modification 2 in two steps).

  5 (a) and 5 (b) are diagrams for explaining a second embodiment of the safety device 16 for a fire shutter according to the present invention. The second embodiment has substantially the same configuration as the first embodiment, but the weight 25 is used in the first embodiment in order to reduce the load in the descending direction of the shutter curtain 2. There is a feature in the configuration using a tension coil spring instead of the weight 25. Below, Example 2 is demonstrated centering around a different structure from Example 1. FIG.

  In FIG. 5A, the lifting piece 22 is attached to the lower end of the wire 18 that spans the first to fourth guide pulleys 31, 32, 35, and 37 as in the first embodiment. A spring fixing shelf 55 is provided in the loading chamber 29. The spring fixing shelf 55 is provided with a gap 56 through which the lifting piece 22 passes.

  A tension coil spring 57 is attached to the spring fixing shelf 55 with its lower end fixed, and a contact plate 58 is fixed to the upper end of the tension coil spring 57. The contact plate 58 is formed with a through hole 59 having a size that allows the wire 18 to pass therethrough but prevents the lifting piece 22 from contacting and passing therethrough.

Action:
The operation of the second embodiment having the above-described configuration is as follows. When the restriction of the motor rotating shaft by the brake 14 is released in the event of a fire and the shutter curtain 2 is lowered, the lifting piece 22 fixed to the lower end of the wire 18 starts to rise, as in the first embodiment, and the rising process As shown in FIG. 5 (b), the lifting piece 22 abuts against the abutment plate 58 and pulls the tension coil spring 57 upward.

  As a result, the shutter curtain 2 moves in the opposite direction to the lowering direction through the process until the lower end of the shutter curtain 2 reaches the floor 21 from the middle of the lowering process (after the lifting piece 22 starts to pull the coil spring 57). The elastic force of the tension coil spring 57 acts to lower the descent speed and reduce the load below the shutter curtain 2. As a result, even when a person is caught between the shutter curtain 2 and the floor 21 when the shutter curtain 2 is lowered, it is possible to prevent injuries and the like.

  The elastic force of the tension coil spring 57 is designed so that the shutter curtain 2 continues to descend and does not stop even when the lifting piece 22 lifts the contact piece and starts to pull the tension coil spring 57 as described above. In short, the elastic force of the tension coil spring 57 is a slightly smaller elastic force P (tensile force) than the upward force F applied to the wire 18 whose upper end is fixed to the wire take-up pulley 17 due to its own weight. Make it as big as you want.

  In the second embodiment, the winding shaft drive shaft 8 is described as having a configuration in which the wire take-up pulley 17 is attached to the take-up shaft drive shaft 8 without using a speed reduction mechanism. The wire take-up pulley 17 may be configured to rotate at a reduced speed with respect to the take-up shaft 7 as a configuration in which the wire take-up pulley 17 is attached to the wire 8 via a speed reduction mechanism. The configuration regarding this point will be described in detail in a fifth embodiment.

(Modification)
FIGS. 5C and 5D are diagrams illustrating a modification of the second embodiment. This modification is characterized in that a plurality of tension coil springs are provided in the loading chamber 29. Here, a configuration in which two tension coil springs are provided will be described.

  In FIG. 5C, a lower spring fixing shelf 60 and an upper spring fixing shelf 61 are provided in the loading chamber 29. The wire 18 is provided with a lifting piece 22 at the lower end and a lifting piece 62 above the lifting piece 22. The lower spring fixing shelf 60 and the upper spring fixing shelf 61 are formed with gaps 63 and 64 through which the lifting pieces 22 and 62 pass, respectively. A lower tension coil spring 65 and an upper tension coil spring 66 are attached to the lower spring fixing shelf 60 and the upper spring fixing shelf 61 with their lower ends fixed.

  A lower contact plate 67 and an upper contact plate 68 are fixed to the upper ends of the lower tension coil spring 65 and the upper tension coil spring 66, respectively. The lower contact plate 67 is formed with a through hole 69 that passes through the wire 18 and the lifting piece 62 but does not pass through the lifting piece 22. The upper contact plate 68 is formed with a through hole 70 that passes through the wire 18 but does not pass through the lifting piece 62.

  The operation of the modified example configured as described above is as follows. When the restriction of the motor rotating shaft by the brake 14 is released in the event of a fire and the shutter curtain 2 is lowered, the lifting piece 22 fixed to the lower end of the wire 18 starts to rise, as in the first embodiment, and the rising process As shown in FIG. 5D, the lifting piece 22 contacts the lower contact plate 67 and pulls the lower tension coil spring 65 upward. Further, when the lifting piece 62 comes into contact with the upper contact plate 68, the upper tension coil spring 66 is also pulled in addition to the lower tension coil spring 65.

  As a result, the elastic force of the lower tension coil spring 65 and the upper tension coil spring 66 opposite to the lowering direction acts on the shutter curtain 2 in two stages, the lowering speed decreases, and the shutter curtain 2 moves downward. The load is reduced. As a result, even when a person is caught between the shutter curtain 2 and the floor 21 when the shutter curtain 2 is lowered, it is possible to prevent injuries and the like.

  When the plurality of tension coil springs 65 and 66 are provided in this way, the elastic force of the tension coil spring 65 is halfway in the descending process of the shutter curtain 2 as in the case where the plurality of weights 25 are provided in the modification of the first embodiment. Even if the action is applied, it is lowered without reducing the speed by an amount corresponding to 100% of the plurality of tension coil springs from the beginning, and the shutter curtain 2 is still high above the floor 21 and sandwiches an adult. However, since the load on the shutter curtain 2 is reduced by an amount corresponding to the pulling force of the lower pulling coil spring 65, it is possible to prevent injuries and the like even if a person is caught.

  Further, when the shutter curtain 2 is relatively close to the upper side of the floor 21 and sandwiches a small child, the elastic force of both the lower tension coil spring 65 and the upper tension coil spring 66 acts, greatly increasing the load on the shutter curtain 2. Therefore, danger can be prevented.

  FIG. 6 is a diagram for explaining a third embodiment of the safety device 16 for fire shutters according to the present invention. The third embodiment has substantially the same configuration as the first and second embodiments, but is different from the second embodiment in that a compression coil spring is used instead of a tension coil spring. Below, Example 3 is demonstrated centering on a different structure from Example 2. FIG.

  In FIG. 6A, the lifting piece 22 is attached to the lower end of the wire 18 that spans the first to fourth guide pulleys 31, 32, 35, and 37 as in the first and second embodiments. A spring fixing shelf 71 is provided in the loading chamber 29. In the spring fixing shelf 71, a gap 72 through which the wire 18 passes is formed.

  The upper end of the compression coil spring 73 is fixed and attached to the lower surface of the spring fixing shelf 71. A contact plate 74 is fixed to the lower end of the compression coil spring 73. The contact plate 74 is formed with a through hole 75 that passes through the wire 18 but does not pass through the lifting piece 22.

  In the third embodiment, the winding shaft drive shaft 8 has been described with a configuration in which the wire take-up pulley 17 is attached to the take-up shaft drive shaft 8 without using a speed reduction mechanism. The wire take-up pulley 17 may be configured to rotate at a reduced speed with respect to the take-up shaft 7 as a configuration in which the wire take-up pulley 17 is attached to the wire 8 via a speed reduction mechanism. The configuration regarding this point will be described in detail in a fifth embodiment.

Action:
The operation of the third embodiment having the above-described configuration is as follows. When the restriction of the motor rotation shaft by the brake 14 is released in the event of a fire and the shutter curtain 2 is lowered, the lifting piece 22 fixed to the lower end of the wire 18 starts to rise as in the first and second embodiments. In the middle of the ascending process, as shown in FIG. 6B, the lifting piece 22 contacts the contact plate 74 and compresses the compression coil spring 73 upward.

  Thereby, the elastic force of the compression coil spring 73 opposite to the descending direction acts on the shutter curtain 2, the descending speed decreases, and the load below the shutter curtain 2 decreases. As a result, even when a person is caught between the shutter curtain 2 and the floor 21 when the shutter curtain 2 is lowered, it is possible to prevent injuries and the like.

  The strength of the compression coil spring 73 is designed so that the shutter curtain 2 continues to descend and does not stop even if the lifting piece 22 lifts the contact piece 74 and compresses the compression coil spring 73 as described above. . In short, the strength of the compression coil spring 73 is such that a downward compression force acts slightly lower than the upward force F applied to the wire 18 whose upper end is fixed to the wire take-up pulley 17 due to the weight of the shutter curtain 2. Make it big.

(Modification)
6C and 6D are diagrams for explaining a modification of the third embodiment. This modification is characterized in that a plurality of compression coil springs are provided in the loading chamber 29. Here, a configuration in which two compression coil springs are provided will be described.

  In FIG. 6C, a lower spring fixing shelf 76 and an upper spring fixing shelf 77 are provided in the loading chamber 29. A lifting piece 22 at the lower end and a lifting piece 78 are attached to the upper side of the wire 18. The lower spring fixing shelf 76 and the upper spring fixing shelf 77 are formed with gaps 79 and 80 through which the lifting pieces 22 and 78 pass, respectively. A lower compression coil spring 81 and an upper compression coil spring 82 are attached to the lower spring fixing shelf 76 and the upper spring fixing shelf 77 with their upper ends fixed.

  A lower contact plate 83 and an upper contact plate 84 are fixed to lower ends of the lower compression coil spring 81 and the upper compression coil spring 82, respectively. The lower contact plate 83 is formed with a through-hole 85 that passes through the wire 18 and the lifting piece 78 but does not pass through the lifting piece 22. The upper contact plate 84 is formed with a through hole 86 that passes through the wire 18 but does not pass through the lifting piece 78.

  The operation of the modified example configured as described above is as follows. When the restriction of the motor rotating shaft by the brake 14 is released in the event of a fire and the shutter curtain 2 is lowered, the lifting piece 22 fixed to the lower end of the wire 18 starts to rise, as in the first embodiment, and the rising process As shown in FIG. 6 (d), the lifting piece 22 abuts on the lower abutting plate 83 and compresses the lower compression coil spring 81. Further, when the lifting piece 78 contacts the upper contact plate 84, the upper compression coil spring 82 is compressed in addition to the lower compression coil spring 81.

  As a result, the elastic force generated by the compression of the lower compression coil spring 81 and the upper compression coil spring 82 opposite to the lowering direction acts on the shutter curtain 2 in two stages, and the lowering speed is reduced. The load on is reduced. As a result, even when a person is caught between the shutter curtain 2 and the floor 21 when the shutter curtain 2 is lowered, it is possible to prevent injuries and the like.

  In Examples 2 and 3, a tension coil spring and a compression coil spring are provided. However, these springs may be appropriately combined with each other, or an air cylinder spring, a hydraulic shock absorber, or the like is attached to these wires. It may be configured such that the lifted piece is engaged from the middle after moving upward, so that the load on the lower side when the shutter curtain 2 is lowered is reduced.

  FIG. 7 is a view for explaining a fourth embodiment of the safety device for fire shutters according to the present invention. The fourth embodiment is substantially the same as the first to third embodiments, but is characterized by a combination of a weight and a spring in order to reduce the load in the descending direction of the shutter curtain 2. In the fourth embodiment, the first embodiment using the weight 25 and the third embodiment using the spring are combined. Below, Example 4 is demonstrated centering on a different structure from Examples 1-3.

  In FIG. 7A, a weight mounting shelf 23 having the same structure as that of the first embodiment is provided in the loading chamber 29 of the box 20, and a weight 25 is placed on the weight mounting shelf 23. Has been. The weight 25 has a through hole 26 in the vertical direction, and the wire 18 hangs down through the through hole 26 so as to be movable up and down, and a lifting piece 22 is attached to the lower end thereof.

  A spring fixing shelf 71 is provided above the weight mounting shelf 23 in the loading chamber 29 as in the third embodiment, and the upper end of the compression coil spring 73 is attached to the lower surface of the spring fixing shelf 71. Further, a contact plate 74 is fixed to the lower end of the compression coil spring 73. The contact plate 74 has a through hole 75 through which the wire 18 passes.

  Now, when the restriction of the rotating shaft of the winding motor 12 by the brake 14 is released, the shutter curtain 2 is lowered by its own weight, and the wire 18 moves upward through the through hole 26 of the weight 25. Then, when the shutter curtain 2 descends, that is, as shown in FIG. 7B, the lifting piece 22 starts to lift the weight 25 when the shutter curtain 2 descends to some extent, and when the shutter curtain 2 descends, As shown in 2 (c), the weight 25 comes into contact with the contact piece 74 and starts to compress the compression coil spring 73.

  As a result, the lowering speed and the downward load of the shutter curtain 2 are first reduced by the weight of the weight 25, and further, when the compression coil spring 73 starts to be compressed, it is reduced by the elasticity of the compression coil spring 73. Thereby, the load in the descending direction of the shutter curtain 2 is reduced. When the shutter curtain 2 is lowered, a large load is not applied even if a person is caught, so that it is possible to prevent injury.

  In the fourth embodiment, the winding shaft drive shaft 8 has been described with a configuration in which the wire take-up pulley 17 is attached to the take-up shaft drive shaft 8 without using a speed reduction mechanism. The wire take-up pulley 17 may be configured to rotate at a reduced speed with respect to the take-up shaft 7 as a configuration in which the wire take-up pulley 17 is attached to the wire 8 via a speed reduction mechanism. The configuration regarding this point will be described in detail in the fifth embodiment.

  FIG. 8 is a diagram for explaining the fifth embodiment. In the fifth embodiment, the wire take-up pulley 17 is attached to the take-up shaft drive shaft 8 via the speed reduction mechanism 86 in the first to fourth embodiments, and the wire take-up pulley 17 is rotated at a reduced speed with respect to the take-up shaft 7. It is characterized by its configuration. The configuration of the fifth embodiment is the same as that of the first to fourth embodiments except for the configuration in which the wire winding pulley 17 is attached to the winding shaft drive shaft 8 via the speed reduction mechanism 86.

  FIG. 8A is a diagram showing a part of the front view of the fire shutter according to the present invention, which is almost the same as that in FIG. 1A, so that the description of the configuration of the same part is omitted and the characteristic part is mainly described. Explained. 8B is a side view for explaining the arrangement of the wire take-up pulley 17 and the speed reduction mechanism 86, and FIGS. 8C and 8D are views for explaining an example of the speed reduction mechanism 86. It is the figure which looked at the inside of mechanism 86 from the side and the upper part.

  8A to 8D, a gear box 88 is attached to the winding case 6 by a bracket 87. The speed reduction mechanism 86 includes a first gear 89, a second gear 90, a third gear 91, and a fourth gear 92 provided in the gear box 88.

  The first gear 89 is concentrically fixed to the winding shaft drive shaft 8. The second gear 90 and the third gear 91 are fixed to the gear shaft 93. The gear shaft 93 is rotatably attached to the gear box 88 by a bearing. The fourth gear 92 is fixed concentrically to the pulley shaft 94. The pulley shaft 94 is rotatably mounted by a bearing in the gear box 88 and fixes the wire take-up pulley 17 concentrically.

  In this reduction mechanism 86, the number of teeth of the second gear 90 is increased from the first gear 89 and the first gear is reduced by meshing the both, and the number of teeth of the fourth gear 92 is increased from the third gear 91 to both By performing the second deceleration by meshing the two, the rotation is reduced and rotated in two stages. Note that the speed reduction mechanism 86 is not limited to such a configuration.

(Function)
According to the fifth embodiment configured as described above, when the restriction of the rotating shaft of the winding motor 12 by the brake 14 is released, the shutter curtain 2 descends by its own weight, and accordingly the winding shaft 7 and the winding shaft drive shaft. 8 rotates.

  The first reduction is performed by the combination of the first gear 89 fixed to the winding shaft drive shaft 8 and the second gear 90 fixed to the gear shaft 93, and further, the first gear 89 is fixed to the gear shaft 93. The second speed reduction is performed by the combination of the third gear 91 and the fourth gear 92 fixed to the pulley shaft 94.

  As a result, the rotation of the take-up shaft drive shaft 8 is decelerated in the pulley shaft 94 and transmitted to the pulley shaft 94 and the wire take-up pulley 17, and the wire 18 is taken up by the wire take-up pulley 17. Note that the load reducing mechanism 19 reduces the load in the downward direction of the shutter curtain 2 as described in the first to fourth embodiments.

(Common modification of Examples 1 to 5)
In Examples 1 to 5 described above, the first to fourth guide pulleys 31, 32, 35, and 37 are so-called constant pulleys. For example, FIG. 9A schematically illustrates the relationship between the weights of the first to fourth guide pulleys 31, 32, 35, 37 and the weight 25 while the shutter curtain 2 of the first embodiment is descending. is there. In the first embodiment, the first to fourth guide pulleys are fixed pulleys, and the weight W of the weight 25 is slightly smaller than the force F ′ that pulls the wire 18 via the wire take-up pulley 17 while the shutter curtain 2 is lowered. Weight.

  However, not only a fixed pulley but also a moving pulley may be combined. With such a configuration, it is possible to reduce the weight of the weight (see Examples 1 and 4) arranged in the mounting chamber 29 or the elasticity of the spring (see Examples 2 and 3).

  For example, as shown in FIG. 9B, the weight W of the weight 25 can be reduced by combining the first and third guide pulleys 31 ′ and 37 ′ as a constant pulley and the second guide pulley 35 ′ as a moving pulley. . In FIG. 9C, when the force that pulls the wire 18 via the wire take-up pulley 17 while the shutter curtain 2 is lowered is F ′, and the weight of the second guide pulley 35 ′ (moving pulley) itself is D, The weight W of the weight 25 may theoretically be slightly smaller than ½ (F ′ + D). Thereby, if the second guide pulley 35 '(moving pulley) is light, the weight W of the weight 25 can be considerably reduced.

  As shown in FIG. 9B, even when the shutter curtain 2 is wound up and restrained by the brake, the second guide pulley 35 ′ (moving pulley) may be lowered by its own weight. In order to prevent this, the lifting piece 22 needs to be formed with a weight larger than ½ of the weight D of the second guide pulley 35 ′. Further, the support shaft that rotatably supports the second guide pulley 35 ′ is linearly guided in the vertical direction by the guide means provided in the mounting chamber 29 (for example, the supporting shaft is mounted in the mounting chamber). 29) is required to be slidably guided by a guide groove provided in the guide 29.

  As another common modification of the first to fifth embodiments, the lifting piece 22 in the first to fifth embodiments is attached to the lower end (tip) of the wire 18, but is not limited to the lower end of the wire 18. It is good also as a structure which can select suitably the position above and attach or detach. In this way, it is possible to adjust the stroke from when the shutter curtain 2 starts to descend until it comes into contact with the weight or spring. That is, the stroke from when the lifting piece 22 starts to come into contact with the weight or the spring until the shutter curtain 2 arrives at the floor 21 and the stroke in which the load in the descending direction of the shutter curtain 2 is reduced can be adjusted.

  The best mode of the safety device for a fire shutter according to the present invention has been described based on the embodiments. However, the present invention is not particularly limited to such embodiments, and the technical matters described in the scope of claims. It goes without saying that there are various embodiments within the scope of the above.

  Since the safety device for a fire shutter according to the present invention has the above-described configuration, the shutter curtain is lowered by its own weight by opening not only the fire shutter 1 and the smoke shutter but also the brake. This shutter can be used for various purposes.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure explaining Example 1, and is a figure which shows the whole structure of the fire shutter which applies the safety device for fire shutters of this invention especially, (a) is a front view, (b) is front view. It is the side view seen from the left side. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram for explaining the basic configuration and operation of a safety device for a fire shutter according to the present invention in Example 1. It is a figure explaining the specific structure of the safety device for fire prevention shutters of this invention, and an effect | action about Example 1. FIG. It is a figure explaining the specific structure and effect | action of the safety device for fire prevention shutters of this invention about the modification of Example 1. FIG. It is a figure explaining the specific structure and effect | action of the safety device for fireproof shutters of this invention about Example 2 and its modification. It is a figure explaining the specific structure and effect | action of the safety device for fire prevention shutters of this invention about Example 3 and its modification. It is a figure explaining the specific structure and effect | action of the safety device for fire prevention shutters of this invention about Example 4. FIG. It is a figure explaining the specific structure and effect | action of the safety device for fire prevention shutters of this invention about Example 5. FIG. It is a figure explaining the modification common to Examples 1-5.

Explanation of symbols

1 Fire shutter
2 Shutter curtain
3 Winding device
4 Slats
5 Guide rail
6 Winding case
7 Winding shaft
8 Winding shaft drive shaft
9 Driven side sprocket
10 Drive side sprocket
11 Chain
12 Winding motor
13 Reducer
14 Brake
15 Control device
16 Safety device for fire shutter
17 Wire take-up pulley
18 wires
19 Load reduction mechanism
20 boxes
21 floors
22 Lifting piece
23 Weight loading shelf
24 Clearance
25 weight
26 Weight through hole
27 Bulkhead
28 Pulley room
29 Loading room
30 The bottom wall of the box
31 First guide pulley
32 Second guide pulley
33 U-shaped bracket
34 Upper wall of the box
35 Third guide pulley
36 U-shaped bracket
37 4th guide pulley
38 Through holes formed in the upper wall
39 Weight for adjustment
40 slots
41 recess
42 Convex
43 Lower weight shelf
44 Medium weight shelf
45 Upper weight shelf
46 Lower weight
47 Medium weight
48 Upper weight
49 Clearance between the lower weight racks
50 Clearance between the middle weight racks
51 Clearance of the upper weight shelf
52 Lower hole
53 Upper hole
54 Lifting piece
55 Spring fixed shelf
56 Clearance
57 Tension coil spring
58 Contact plate
59 Through hole of contact plate
60 Lower spring fixed shelf
61 Upper spring fixing shelf
62 Lifting piece
63 Clearance of the lower spring fixing shelf
64 Clearance of upper spring fixing shelf
65 Lower tension coil spring
66 Upper tension coil spring
67 Lower contact plate
68 Upper contact plate
69 Through hole in lower contact plate
70 Through hole of upper contact plate
71 Spring fixed shelf
72 Spring fixed shelf gap
73 Compression coil spring
74 Contact plate
75 Contact plate through hole
76 Lower spring fixed shelf
77 Upper spring fixing shelf
78 Lifting piece
79 Clearance of lower spring fixing shelf
80 Clearance of upper spring fixing shelf
81 Lower compression coil spring
82 Upper compression coil spring
83 Lower contact plate
84 Upper contact plate
85 Through hole of lower contact plate
86 Deceleration mechanism
87 Bracket
88 gearbox
89 1st gear
90 Second gear
91 3rd gear
92 4th gear
93 Gear shaft
94 Pulley shaft

Claims (6)

The shutter curtain is wound around the take-up shaft by the rotational force of the take-up motor so that the fire-proof shutter is opened, and this state is restrained and maintained by the brake, and the restraint of the brake is released. It is a safety device for a fire shutter in a fire shutter that is closed by dropping by its own weight,
A wire take-up pulley that rotates in conjunction with rotation of the take-up shaft;
A wire whose upper end is fixed to the wire take-up pulley, and a lifting piece is attached and suspended;
A weight that is inserted so that the wire can pass therethrough and is disposed above the lifting piece;
With
When the wire is taken up by the wire take-up pulley in conjunction with the lowering of the shutter curtain and the lifting piece rises, the lifting piece comes into contact with the weight and lifts up, and a fire-proof shutter is passed through the wire. A safety device for a fire shutter, which is configured to reduce the load in the descending direction of the fire.   The safety device for a fire shutter according to claim 1, wherein a plurality of weights are provided along the wire. The shutter curtain is wound around the take-up shaft by the rotational force of the take-up motor so that the fire-proof shutter is opened, and this state is restrained and maintained by the brake, and the restraint of the brake is released. It is a safety device for a fire shutter in a fire shutter that is closed by dropping by its own weight,
A wire take-up pulley that rotates in conjunction with rotation of the take-up shaft;
A wire having an upper end fixed to the wire take-up pulley and a lifting piece attached to the lower end and suspended;
A tension spring or a compression spring in which the wire is inserted so that it can pass through, one end disposed above the lifting piece is fixed, and the other end is in a free state;
With
When the wire is taken up by the wire take-up pulley in conjunction with the lowering of the shutter curtain and the lifting piece rises, the lifting piece comes into contact with the other end of the tension spring or compression spring and pulls. Alternatively, a safety device for a fire shutter, which is configured to compress and reduce a load in a descending direction of the fire shutter through the wire.   4. The fire shutter safety device according to claim 3, wherein a plurality of the tension springs or compression springs are provided along the wire. The shutter curtain is wound around the take-up shaft by the rotational force of the take-up motor so that the fire-proof shutter is opened, and this state is restrained and maintained by the brake, and the restraint of the brake is released. It is a safety device for a fire shutter in a fire shutter that is closed by dropping by its own weight,
A wire take-up pulley that rotates in conjunction with rotation of the take-up shaft;
A wire whose upper end is fixed to the wire take-up pulley, and a lifting piece is attached and suspended;
A weight that is inserted so that the wire can pass therethrough and is disposed above the lifting piece;
A tension spring or a compression spring in which the wire is inserted so that it can pass through, one end disposed above the lifting piece is fixed, and the other end is in a free state;
With
In conjunction with the lowering of the shutter curtain, the wire is wound around the wire take-up pulley, and when the lifting piece rises, the lifting piece comes into contact with the weight and lifts up,
When the lifting piece further rises, the weight is brought into contact with the other end of the tension spring or compression spring to be pulled or compressed, and the load in the downward direction of the fire shutter is reduced via the wire. A safety device for fire prevention shutters.   The fire protection shutter safety device according to any one of claims 1 to 5, wherein the take-up pulley is provided to the take-up shaft via a speed reduction mechanism.

Images