JP2006125120A - Fire-proofing and smoke-proofing screen curtain device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fire-proofing and smoke-proofing screen curtain device, used in the case of installing a screen device up to the wall edge of a building, having excellent flexibility and facilitating the installation work. <P>SOLUTION: A speed regulating means for slowing the descending speed of the screen curtain includes: a speed increasing mechanism for increasing the rotating speed of a take-up shaft when the screen curtain descends; and a centrifugal force brake for generating braking force according to the output speed of the speed increasing mechanism. The speed increasing mechanism has first to third transmission gears 61, 62, 63 respectively rotatably supported between the adjacent wall parts 54 in a housing 50. In the second transmission gear 62, a support shaft 62a is movable along an elongated hole 69 of each wall part and always meshes with the first transmission gear 61, and when the screen curtain descends, the support shaft is located at one end side of the elongated hole to mesh with the third transmission gear 63 as well to transmit power. When the screen curtain rises, the support shaft is moved to the other end side of the elongated hole by rotation of the first transmission gear to disengage from the third transmission gear. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fire / smoke screen curtain device that is installed as a shutter / swing wall for fire / smoke prevention in a building opening or ceiling.

  Conventionally, as a screen curtain device for fire prevention and smoke prevention, for example, as disclosed in Patent Document 1, a winding shaft (also referred to as a winding drum) rotatably attached to an upper edge portion or a ceiling portion of an opening of a building. And a screen curtain composed of a fire-resistant cloth wound around the winding shaft, and an operation means for operating the lowering of the screen curtain, and a signal such as a smoke sensor or the person constituting the operation means in the event of a fire It is known that the screen curtain is extended from the take-up shaft and lowered based on the button operation, etc., and the opening of the building or the indoor space is shut off like a shutter, or the indoor upper space is partitioned like a leaning wall. It has been.

In such a screen curtain device for fire prevention and smoke prevention, as disclosed in Patent Document 1, in order to ensure the safety by slowing the descending speed of the screen curtain, it is further provided at one end of the winding shaft. A coupled speed adjusting means (corresponding to the speed reducing means of Patent Document 1) and a clutch provided between the speed adjusting means and the take-up shaft, and interrupting transmission of rotational force between the two when the screen curtain is raised Means. In this case, as the speed adjusting means, normally, a speed increasing mechanism for increasing the rotation speed of the winding shaft when the screen curtain descends and outputting, and an output connected to the speed increasing mechanism and transmitted from the speed increasing mechanism. What has a centrifugal brake which generates braking force according to speed is used.
JP 2003-310777 A

  However, in the above-described conventional one, the clutch means, the speed increasing mechanism of the speed adjusting means, and the centrifugal brake are arranged in a row on one end side of the winding shaft, so that the axial length is increased accordingly. For this reason, when installing a screen curtain device for fire prevention and smoke prevention in order to make it possible to block the indoor space with a screen curtain up to the wall of the building, it is possible to secure a sufficient space on the ceiling near the wall of the building. It is not possible to install.

  Further, it is necessary to center and attach both the clutch means and the speed adjusting means on the axis of the take-up shaft at the time of installation work, and there is a problem that the work is complicated.

  The present invention has been made in view of the above points, and the problem is that the screen curtain device is installed up to the wall of the building by integrating the conventional clutch means and the speed adjusting means and reducing the thickness. It is intended to provide a screen curtain device for fire and smoke prevention that can be used even in the case where it is used, has excellent versatility, and can be easily installed.

  In order to solve the above-described problems, the invention according to claim 1 is directed to a screen curtain device for fire and smoke prevention, and a winding shaft rotatably supported on the upper edge or ceiling of the opening of a building, A screen curtain that is wound around the take-up shaft and is lowered from the take-up shaft by releasing the brake of the take-up shaft in the event of a fire, and is connected to one end of the take-up shaft in order to slow down the screen curtain. Speed adjusting means, and the speed adjusting means is connected to the speed increasing mechanism for increasing the rotational speed of the take-up shaft when the screen curtain is lowered, and is transmitted from the speed increasing mechanism. It is assumed that it has a centrifugal brake that generates a braking force in accordance with the output speed. The speed increasing mechanism has a series of three transmission gears that are rotatably supported between at least two adjacent wall portions in the housing, and an intermediate transmission gear has a support shaft on the intermediate transmission gear. It is movable along the long holes formed in each wall and always meshes with other transmission gears near the take-up shaft. When the screen curtain is lowered, the support shaft is located at one end of the long hole and close to the centrifugal brake. Engage with other transmission gears to transmit power, and when the screen curtain is lowered, the support shaft moves to the other end side of the long hole due to the rotation of the other transmission gear near the take-up shaft. It is set as the structure provided so that meshing | engagement with other transmission gears near may be removed.

  In this configuration, in the speed increasing mechanism of the speed adjusting means, in addition to the original speed increasing function, an intermediate transmission of a series of three transmission gears supported between two adjacent walls in the housing. While the gear is always meshed with the other transmission gear near the take-up shaft, the support shaft is located at one end of the long hole formed in each wall when the screen curtain is lowered, and the other transmission gear near the centrifugal brake To the other end of the long hole due to the rotation of the other transmission gear near the take-up shaft when the screen curtain rises after descending, and the other transmission near the centrifugal brake Since the engagement with the gear is disengaged, the function as a conventional clutch means can be exhibited. In addition, the axial length can be shortened as compared to the case where the clutch means, the speed increasing mechanism of the speed adjusting means and the centrifugal brake are arranged in a row on one end side of the winding shaft as in the prior art. At the time of installation work, only the speed adjusting means needs to be centered and attached on the axis of the take-up shaft, and the work can be easily performed correspondingly.

  According to a second aspect of the present invention, in the screen curtain device for fire prevention and smoke prevention according to the first aspect, the housing of the speed increasing mechanism includes a housing main body constituting an outer wall surface including two left and right side wall surfaces, And the three transmission gears are arranged between one side wall surface of the housing body and the partition wall, and two spaces in the housing body are formed. In addition, a speed increasing gear different from the transmission gear is arranged. In this configuration, since the housing of the speed increasing mechanism is a relatively simple structure including a housing main body that forms the outer wall surface and a partition wall that partitions the inside of the housing main body into two left and right spaces, the speed increasing mechanism Can be thinned in the axial direction.

  The invention according to claim 3 is the screen curtain device for fire and smoke prevention according to claim 2, wherein the housing main body further comprises a first outer wall plate that constitutes one of left and right side walls, an upper wall surface, and a lower wall surface. And a second outer wall plate constituting the other side wall surface, the front wall surface, and the rear wall surface, and each outer wall plate of the housing body and the partition wall are separated from each other by a predetermined dimension via a spacer. It is configured to be combined. In this configuration, the housing main body is constituted by the first and second outer wall plates, and the outer wall plates and the partition walls are coupled via the spacers. It can be made thinner in the axial direction and can be easily assembled.

  The invention according to claim 4 provides a specific form of the centrifugal brake in the screen curtain device for fire prevention and smoke prevention according to any one of claims 1 to 3. That is, the centrifugal brake includes a brake disk that is integrally connected to an output shaft that extends out of the housing of the speed increasing mechanism, and a brake drum that is fixed to the housing of the speed increasing mechanism so as to cover the brake disk. A brake shoe whose one end is supported by the brake disc so as to be swingable around a support shaft, and whose other end is in contact with the brake drum; and a spring that biases the other end of the brake shoe in a direction away from the brake drum; It is set as the structure which has. In this configuration, when the screen curtain is lowered, the rotation speed of the take-up shaft is increased by the speed increasing mechanism and transmitted from the output shaft to the brake disc of the centrifugal brake. When this brake disc rotates, the brake shoe is moved by the centrifugal force. A braking force is generated by rotating around the support shaft against the biasing force of the spring and contacting the brake drum.

  The invention according to claim 5 is the fire and smoke screen curtain device according to claim 4, further comprising operating means for operating the lowering of the screen curtain, the operating means being a brake for the centrifugal brake. A lever disposed close to the drum and having one end supported on the housing of the speed increasing mechanism so as to be rotatable about a support shaft, and a brake disc attached to a central portion of the lever and through an opening provided in the brake drum A lining capable of contacting the outer peripheral surface of the lever, an operation wire connected to the other end of the lever via a first adjustment spring, and when the operation wire is loosened, the lever is rotated in a direction in which the lining separates from the brake disc. And a second adjustment spring that is urged to move.

  In this configuration, when the operation wire is in a tension state, the lever is attracted to the brake drum side of the centrifugal brake by the operation wire and the first adjustment spring, and the lining attached to the center portion of the lever is the opening of the brake drum. By contacting the outer peripheral surface of the brake disc through the portion, the rotation of the brake disc, and hence the lowering of the screen curtain, is held in a stopped state. When the operation wire is loosened from this state, the lever is rotated around the support shaft by the second adjustment spring and the lining is separated from the brake disc, whereby the screen curtain starts to descend. In this case, since the connection between the operation wire and the lever is performed via the first adjustment spring, wiring in the tension state of the operation wire can be easily performed.

  As described above, according to the screen curtain device for fire and smoke prevention according to the present invention, the speed increasing mechanism of the speed adjusting means also exhibits a clutch function by a series of transmission gears. The axial length can be shortened as compared with the case where the clutch means, the speed increasing mechanism of the speed adjusting means and the centrifugal brake are arranged in a row on one end side. As a result, the screen curtain device can be easily installed even when a sufficient space cannot be secured in the ceiling, such as near the wall of a building, and is excellent in versatility. Further, since only the speed adjusting means needs to be centered and attached on the axis of the take-up shaft during the installation work, the work can be facilitated.

  In particular, in the invention according to claim 2, the housing of the speed increasing mechanism is a relatively simple one composed of a housing main body constituting the outer wall surface and a partition wall dividing the inside of the housing main body into two left and right spaces. Therefore, the speed increasing mechanism can be thinned in the axial direction, which is excellent in practicality.

  In the invention according to claim 3, the housing body is constituted by the first and second outer wall plates, and each plate and the partition wall are coupled via the spacers. The thickness of the mechanism in the axial direction can be further reduced, and the assembling work can be easily performed.

  Furthermore, in the invention according to claim 5, it is possible to reliably operate the lowering of the screen curtain by the operation means using the brake disk of the centrifugal brake, and it is possible to easily wire the operation wire in a tension state. Thus, the installation work can be facilitated.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments that are the best mode for carrying out the present invention will be described below with reference to the drawings.

  1 and 2 show a fire and smoke screen curtain device A according to an embodiment of the present invention. The screen curtain device A is for blocking the opening 1 such as a building entrance and a passageway in the event of a fire, and includes a winding shaft 11 disposed substantially horizontally on the ceiling 2 on the upper edge side of the opening 1. Yes. The take-up shaft 11 has support shafts 12 and 13 that extend outward on the shaft center at both left and right ends thereof, and brackets attached to the beam 3 of the ceiling portion 2 via the support shafts 12 and 13. 14 and 15 are rotatably supported.

  A screen curtain 21 made of a fireproof cloth or the like is wound around the outer peripheral surface of the winding shaft 11, and a seat plate 22 as a weight is attached to the lower end of the screen curtain 21. This seat plate 22 is normally located in the slit-shaped descent port 4 provided in the ceiling part 2. When the brake state (that is, the rotation stop state) of the winding shaft 11 is released by an operation means 90 described later in the event of a fire or the like, the winding shaft 11 is rotated by the weight of the seat plate 22 and the screen curtain 21 is rotated. The seat plate 22 is lowered to the floor 5 as shown in the figure, and the opening 1 is blocked by the screen curtain 21 as shown in the figure. Reference numeral 26 denotes a box cover provided on the ceiling portion 2 so as to cover the winding shaft 11 and the brackets 14, 15, etc., and 27 L and 27 R are a pair of guide rails provided on the left and right edges of the opening 1, When the screen curtain 21 is lowered, both left and right ends of the seat plate 22 and both left and right edges of the screen curtain 21 are guided along the guide rails 27L and 27R. The edge is held by the guide rails 27L and 27R.

  As shown in FIG. 3, the take-up shaft 11 is formed in a hollow cylindrical shape, and one end of the support shaft 12 is a bearing and an end plate at one end (the left end in the figure) of the take-up shaft 11. The other end of the support shaft 12, that is, the end extending outside the take-up shaft 11, is fixed to the bracket 14. On the other hand, one end of a support shaft 13 is fixedly connected to the other end portion (right end portion in the figure) of the take-up shaft 11, and the other end portion of the support shaft 13, that is, an end portion extending outside the take-up shaft 11. Is supported rotatably on the bracket 15 via a bearing 35. Further, a torsion coil spring 38 extending over substantially the entire length is disposed inside the take-up shaft 11, and one end of the torsion coil spring 38 is on the side of the support shaft 12, which is the stationary side, and the other end is on the movable side. The torsion coil spring 38 is twisted with the rotation of the winding shaft 11 when the screen curtain 21 is lowered. The reaction force imparts an appropriate tension to the screen curtain 21 when the opening 1 is cut off, and rotates the winding shaft 11 when the screen curtain 21 is lifted by lifting the seat plate 22 at the lower end of the screen curtain 21. The screen curtain 21 is wound up.

  A speed adjusting means 40 for reducing the descending speed of the screen curtain 21 is connected to the support shaft 13 at the right end of the winding shaft 11, and this speed adjusting means 40 is disposed outside the bracket 15 and attached. It is attached to the bracket 15 via the plate 41. As shown in detail in FIGS. 4 to 7, the speed adjusting means 40 includes a speed increasing mechanism 50 that increases the rotational speed of the winding shaft 11 when the screen curtain 21 is lowered, and outputs the speed increasing mechanism 50. The centrifugal brake 80 is connected and generates a braking force in accordance with the output speed transmitted from the speed increasing mechanism 50.

  The speed increasing mechanism 50 includes a series of three transmission gears 61, 62, 63 and three speed increasing gears 64, 65, 66 arranged rotatably in a housing 51. The housing 51 includes a box-shaped housing main body 52 having a small lateral width that constitutes six outer wall surfaces, that is, a front wall surface 51a, a rear wall surface 51b, an upper wall surface 51c, a lower wall surface 51d, a right wall surface 51e, and a left wall surface 51f. It consists of a rectangular plate-like partition wall 54 that partitions the interior into two left and right spaces 53L and 53R. Further, the housing main body 52 has a U-shaped first outer wall plate 55 that constitutes a right wall surface 51e, an upper wall surface 51c, and a lower wall surface 51d, a left wall surface 51f, a front wall surface 51a, and a rear wall surface 51b. The first outer wall plate 55 is connected to the upper and lower edges of the first outer wall plate 55, that is, the edge on the upper wall surface 51c side and the edge on the lower wall surface 51d side, respectively, with the mounting plate 41 and the like. Flange portions 55a and 55a are formed. The first outer wall plate 55 and the second outer wall plate 56 are assembled so as to form a box shape with the partition wall 54 interposed therebetween, and the outer wall plates 55 and 56 and the partition wall 54 are At these four corners, as shown in an enlarged detail in FIG. Both of the spacers 57 and 58 are hexagonal columnar, and one end portion of the spacer 57 is formed with a screw portion 57a that is screwed into a screw hole 59 provided in the second outer wall plate 56. A screw hole 57 b is formed at the other end of the spacer 57. In addition, a threaded portion 58a that is screwed into a threaded hole 57b of the spacer 57 is formed at one end of the spacer 58, and a threaded hole 58b is formed at the other end of the spacer 58. A set screw 60 is screwed into the outer wall plate 55 from the outside.

  All of the three transmission gears 61 to 63 are disposed between the space 53 </ b> L in the housing 51, that is, between the left wall surface 51 f and the partition wall 54. Among them, the first transmission gear 61 near the winding shaft 11 and the third transmission gear 63 near the centrifugal brake 80 have the same diameter and the same number of gears, and both ends of the support shafts 61a and 63a. The respective parts are rotatably supported by the left wall surface 51 f and the partition wall 54 of the housing 51 through bearings 67. The two transmission gears 61 and 63 are arranged on the substantially same vertical line with the first transmission gear 61 on the upper side and close to each other, and the take-up shaft 11 of the support shaft 61a of the first transmission gear 61. The side end portion extends outside the housing 51 and is connected to the support shaft 13 of the take-up shaft 11 via a coupling 68 as shown in FIG.

  The second transmission gear 62 located in the middle of the three transmission gears 61 to 63 has a diameter and the number of gears as compared with the other two transmission gears 61 and 63 as shown in FIGS. The both ends of the support shaft 62a are supported so as to be movable and rotatable along the long holes 69 formed in the left wall surface 51f and the partition wall 54, respectively. The long hole 69 is formed in an arc shape centered on the axis of the first transmission gear 61. Therefore, the second transmission gear 62 always meshes with the first transmission gear 61 regardless of the position of the support shaft 62a in the long hole 69, and the support shaft 62a is shown by a solid line in FIG. As shown in FIG. 4, the first transmission gear 61 is rotated when the screen curtain 21 ascends after the lowering of the screen transmission 21 (shown in the direction of rotation). 9 counterclockwise), the support shaft 62a moves to the other end side of the long hole 69 as shown by the phantom line in FIG. 9 so that the engagement with the third transmission gear 63 is released.

  Of the three speed increasing gears 64 to 66, the first speed increasing gear 64 that meshes with the third transmission gear 61 is disposed in the space 53L in the housing 51, like the transmission gears 61 to 63. The second speed increasing gear 65 and the third speed increasing gear 66 meshing therewith are arranged between another space 53R in the housing 51, that is, between the partition wall 54 and the right side wall surface 51e. Further, the first speed increasing gear 64 and the second speed increasing gear 65 are integrally rotated at the same height position as the third transmission gear 61 in the housing 51 via the same support shaft 71. Is provided. That is, as shown in enlarged detail in FIG. 11, the support shaft 71 penetrates the partition wall 54 of the housing 51 and is provided between the left and right side wall surfaces 51 e and 51 f, and both end portions of the support shaft 71. Are rotatably supported on the side wall surfaces 51e and 51f via bearings 72, respectively. The first speed increasing gear 64 is integrally formed with the support shaft 71 at a position between the space 53L in the housing 51, that is, the left wall surface 51f and the partition wall 54 so as to mesh with the third transmission gear 61. The second speed-up gear 65 is integrally fitted at a position between the partition wall 54 and the right side wall surface 51e. The diameter and the number of gears of the second speed increasing gear 65 are both set larger than that of the first speed increasing gear 64. Further, the third speed increasing gear 66 is integrally formed with the output shaft 73 of the speed increasing mechanism 50 as shown in an enlarged detail in FIG. And one end of the output shaft 73 extends from the right wall 51e to the outside of the housing 51 while being rotatably supported by the right wall 51e via a bearing 74. The diameter and the number of gears of the third speed increasing gear 66 are both set smaller than that of the second speed increasing gear 65.

  On the other hand, the centrifugal brake 80 includes a brake disc 81 connected to one end of an output shaft 73 extending out of the housing 51 of the speed increasing mechanism 50 and integrally connected to the speed increasing mechanism 50, as shown in detail in FIGS. A shallow bottom cylindrical brake drum 82 fixed to the right side wall surface 51e of the housing 51 of the speed increasing mechanism 50 so as to cover the brake disc 81, and one end of each of the brake disc 81 and the support shaft 83 around the brake disc 81. A pair of brake shoes 85 and 85 that are supported so as to be able to swing and whose other end side can contact the inner surface of the cylindrical portion 82a of the brake drum 82 via the brake pad 84 and the like, and the brake shoes 85 and 85 are provided respectively. It is provided straddling between the joint portions 85a, 85a, and the other end sides of both brake shoes 85, 85 are separated from the inner surface of the cylindrical portion 82a of the brake drum 82. Comprising a coil spring 86 for urging direction twice movement. At the tip of the cylindrical portion 82a of the brake drum 82, flange portions 82b for fixing to the housing 51 of the speed increasing mechanism 50 are formed at two positions facing each other across the center, and the cylindrical portion of the brake drum 82 is formed. An opening 87 is provided in a portion located at the uppermost portion of 82 a so as to face the outer peripheral surface of the brake disc 81.

  Further, as shown in FIGS. 4 and 5, the screen curtain device A includes an operation means 90 for operating the lowering of the screen curtain 21. The operating means 90 is disposed close to the upper side of the brake drum 82 of the centrifugal brake 80, and one end of the operating means 90 is supported on the right side wall surface 51e of the housing 51 of the speed increasing mechanism 50 so as to be rotatable around the support shaft 91. And a wire plate 93 fixed to the right side wall surface 51e of the housing 51 of the speed increasing mechanism 50 by screwing corresponding to the other end (free end) side of the lever 92. The lever 92 is U-shaped with a cross-section opening downward, and at the center thereof, as shown in FIG. A lining 94 is attached.

  The wire plate 93 is formed with a first flange portion 93a below the free end of the lever 92, and the lever 92 is sandwiched between the first flange portion 93a and the support shaft 91 of the lever 92. The second and third flange portions 93b and 93c that are vertically opposed to each other are formed. One end of the outer wire 95a of the operation wire 95 is connected to the first flange portion 93a. One end of the inner wire 95b of the operation wire 95 extends through the free end side of the lever 92 to the upper side of the lever 92, and a spring seat 96 attached to one end of the inner wire 95b and a spring seat 97 attached to the lever 92. A first adjustment spring 98 made of a coil spring is disposed in a compressed state between them, and therefore one end of the inner wire 95b is connected to the free end of the lever 92 via the first adjustment spring 96. ing. Although not shown, the other end of the operation wire 95 is connected to an operation box attached to a wall in the vicinity of the opening 1 and the operation wire 95 is pulled by an operation lever of the operation box or the operation box is operated. The operation wire 95 is loosened by a button or the like.

  Further, a guide pin 99 penetrating the lever 92 is provided between the second flange portion 93b and the third flange portion 93c in the middle, and the outer periphery of the guide pin 99 is formed by a coil spring. The second adjusting spring 100 is arranged in a state of being sandwiched between the lever 92 and the third flange portion 93c. The second adjustment spring 100 has a spring constant set smaller than that of the first adjustment spring 98, and when the operation wire 95 is loosened (that is, the spring force of the first adjustment spring 98 is a lever). When the lever 92 no longer acts, the lever 92 is urged to rotate upward, that is, in a direction in which the lining 94 separates from the brake disc 81.

  Next, the operation of the screen curtain device A, particularly the operation of the speed adjusting means 40 and the operating means 90, which are the features of the present invention, will be described. Now, the screen curtain 21 is wound around the outer periphery of the winding shaft 11, and the operation wire 95 of the operation means 90 is pulled, that is, in a tension state. At this time, in the operation means 90, the lever 92 is pulled toward the brake drum 82 side of the centrifugal brake 80 by the operation wire 95 and the first adjustment spring 98, and the lining 94 passes through the opening 87 of the brake drum 82 and the brake disc 81. , The rotation of the brake disc 81 and the lowering of the screen curtain 21 are held in a stopped state.

  When the operation wire 95 is loosened from this state, the spring force of the first adjustment spring 98 does not act on the lever 92, and the lever 92 rotates upward around the support shaft 91 by the spring force of the second adjustment spring 100. When the lining 94 is separated from the brake disc 81, the winding shaft 11 is free to rotate, and the screen curtain 21 is lowered by the weight of the seat plate 22.

  At this time, in the speed increasing mechanism 50 of the speed adjusting means 40, the first transmission gear 61 among the three transmission gears 61 to 63 receives rotational force from the support shaft 13 of the winding shaft 11, and 9, the second transmission gear 62 has its support shaft 62a positioned on one end side of the long hole 69 as shown by a solid line in FIG. 9, and the first transmission gear 61 and the third transmission gear. It rotates while meshing with both of 63. As a result, the rotational force of the take-up shaft 11 is transmitted to the speed increasing gears 64 to 66 via the transmission gears 61 to 63, and the rotational speed is increased by the speed increasing gears 64 to 66 and the centrifugal force is increased. It is output to the force brake 80. Due to the operation of the centrifugal brake 80, the screen curtain 21 is gently lowered.

  On the other hand, when the screen curtain 21 is lifted by raising the seat plate 22 at the lower end of the screen curtain 21 after the screen curtain 21 is lowered, the first transmission gear 61 rotates counterclockwise in FIG. The support shaft 62a of the transmission gear 62 moves to the other end side of the long hole 69 as shown by the phantom line in FIG. 9, and the engagement between the second transmission gear 62 and the third transmission gear 63 is released. For this reason, no rotational force is transmitted to the centrifugal brake 80 side, and the screen curtain 21 can be raised smoothly without the centrifugal brake 80 being operated.

  As described above, the speed increasing mechanism 50 of the speed adjusting means 40 transmits or blocks the rotational force according to the rotation direction by the three transmission gears 61 to 63 separately from the speed increasing function by the speed increasing gears 64 to 66. Since it also functions as a clutch, it is axially compared to the case where the clutch means, the speed increasing mechanism of the speed adjusting means and the centrifugal brake are arranged in a row on one end side of the take-up shaft 11 as in the prior art. As a result, it is possible to easily install the screen curtain device A even when a sufficient space cannot be secured in the ceiling such as a wall of a building. Further, since only the speed adjusting means 40 has to be centered and attached on the axis of the take-up shaft 11 during the installation work, the work can be easily performed correspondingly.

  In particular, in the case of this embodiment, the housing 51 of the speed increasing mechanism 50 includes a housing main body 52 that constitutes an outer wall surface, and a partition wall 54 that partitions the inside of the housing main body 52 into two left and right spaces 53L and 53R. Since the housing main body 52 is composed of two outer wall plates 55 and 56, and the outer wall plates 55 and 56 and the partition wall 54 are coupled via spacers 57 and 58, respectively, the speed increasing mechanism 50 is axially arranged. Thus, the thickness can be reduced and the assembling work can be easily performed.

  Further, since the operation wire 90 (specifically, the inner wire 95b) is connected to the lever 92 via the first adjustment spring 98, the operation means 90 can be easily wired in the tension state of the operation wire 95. This can be done reliably and reliably. In addition, when the operation wire 95 is loosened, the lever 92 is rotated upward around the support shaft 91 by the second adjustment spring 100 and the lining 94 is separated from the brake disc 81, so that the screen curtain 21 starts to descend by releasing the brake. The operation can be performed reliably, and the operation reliability can be improved.

  In addition, this invention is not limited to the said embodiment, A various other form is included. For example, in the above embodiment, of the series of three transmission gears 61 to 63 of the speed increasing mechanism 50, the first transmission gear 61 near the winding shaft 11 and the third transmission gear 63 near the centrifugal brake 80 are used. Although the number of gears is the same and the number of second transmission gears 62 located in the middle is set smaller than that of the first and third transmission gears 61 and 63, the present invention is not limited to this. Alternatively, the number of gears of the three transmission gears 61 to 63 may be set as appropriate so that these transmission gears 61 to 63 have a function as a speed increasing gear. At this time, the speed-dedicated gears 64 to 66 may be reduced.

  Moreover, in the said embodiment, although the screen curtain apparatus A for fire prevention and smoke prevention which interrupts | blocks the opening parts 1 of the entrance / exit of a building, a passage opening, etc. at the time of a fire was described, this invention is a room other than the opening part 1 of a building at the time of a fire. Of course, the present invention can be similarly applied to a screen curtain device as a fire / smoke / shutter shutter that blocks a space or the like, or a screen curtain device as a smoke proof wall that partitions an upper space in a building interior in the event of a fire. is there.

1 is a partially cutaway front view of a fire and smoke screen curtain device according to an embodiment of the present invention. It is sectional drawing in the XX line of FIG. It is an expanded sectional view in the YY line of FIG. It is a front view which shows structures, such as a speed adjustment means which are the principal parts of the said screen curtain apparatus. It is a partially incision right side view. It is sectional drawing in the ZZ line | wire of FIG. It is sectional drawing in the EE line | wire of FIG. It is an expanded sectional view in the FF line of FIG. FIG. 7 is an enlarged view of the vicinity of the second transmission gear in FIG. 6. It is sectional drawing in the GG line of FIG. It is an expanded sectional view in the HH line of FIG. It is an expanded sectional view in the II line of FIG. It is sectional drawing in the JJ line of FIG.

Explanation of symbols

A Fire and smoke screen curtain device 11 Winding shaft 21 Screen curtain 40 Speed adjusting means 50 Speed increasing mechanism 51 Housing 51a Front wall surface 51b Rear wall surface 51c Upper wall surface 51d Lower wall surface 51e Right wall surface 51f Left wall surface 52 Housing body 53L, 53R Space 54 Partition wall 55 First outer wall plate 56 Second outer wall plate 57, 58 Spacer 61, 62, 63 Transmission gear 62a Transmission gear support shaft 64, 65, 66 Speed increasing gear 69 Long hole 73 Output shaft 80 Centrifugal force Brake 81 Brake disc 82 Brake drum 85 Brake shoe 86 Coil spring 87 Opening 90 Operation means 91 Support shaft 92 Lever 94 Lining 95 Operation wire 95b Inner wire 98 First adjustment spring 100 Second adjustment spring

Claims (5)

A winding shaft that is rotatably supported on the upper edge or ceiling of the opening of the building, and is wound around the winding shaft, and is unwound from the winding shaft by lowering the winding shaft in the event of a fire and descends. A screen curtain and speed adjusting means connected to one end of the take-up shaft in order to slow down the descending speed of the screen curtain, the speed adjusting means being a rotational speed of the take-up shaft when the screen curtain is lowered. For the fire and smoke prevention, which has a speed increasing mechanism for speeding up the output and a centrifugal brake connected to the speed increasing mechanism and generating a braking force according to the output speed transmitted from the speed increasing mechanism In the screen curtain device,
The speed increasing mechanism has a series of three transmission gears that are rotatably supported between at least two adjacent wall portions in the housing, and an intermediate transmission gear of which the support shaft is attached to each wall. It is movable along the long hole formed in the part and always meshes with another transmission gear near the take-up shaft, and when the screen curtain is lowered, the support shaft is located at one end of the long hole and close to the centrifugal brake. The transmission shaft engages with the other transmission gear to transmit power, and when the screen curtain is lowered, the shaft moves toward the other end of the long hole due to the rotation of the other transmission gear near the winding shaft, and close to the centrifugal brake A screen curtain device for fire and smoke prevention, which is provided so as to be disengaged from other transmission gears.   The housing of the speed increasing mechanism includes a housing body that forms an outer wall surface including two left and right side wall surfaces, and a plate-like partition wall that partitions the inside of the housing body into two left and right spaces. The three transmission gears are The speed increasing gear different from the transmission gear is disposed in two spaces in the housing body, which is disposed between one side wall surface of the housing body and the partition wall. Screen curtain device for fire and smoke prevention.   The housing main body includes a first outer wall plate that forms one of the left and right side wall surfaces, an upper wall surface, and a lower wall surface, and a second outer wall plate that forms the other side wall surface, the front wall surface, and the rear wall surface. 3. The screen curtain device for fire and smoke prevention according to claim 2, wherein each outer wall plate of the housing body and the partition wall are connected to each other with a predetermined dimension through a spacer.   The centrifugal brake includes a brake disk that is integrally connected to an output shaft that extends out of the housing of the speed increasing mechanism, a brake drum that is fixed to the housing of the speed increasing mechanism so as to cover the brake disk, and one end Is supported by the brake disc so as to be swingable around the support shaft, and has a brake shoe whose other end can come into contact with the brake drum, and a spring that biases the other end of the brake shoe away from the brake drum. The screen curtain device for fire prevention and smoke prevention according to any one of claims 1 to 3. An operating means for operating the lowering of the screen curtain is provided, and this operating means is arranged in the vicinity of the brake drum of the centrifugal brake, and one end thereof is rotatable around the support shaft in the housing of the speed increasing mechanism. A supported lever, a lining attached to the central portion of the lever and capable of contacting the outer peripheral surface of the brake disc through an opening provided in the brake drum, and a first adjusting spring at the other end of the lever 5. A fireproof and smokeproof device according to claim 4, further comprising a connected operation wire and a second adjustment spring for urging the lever in a direction in which the lining separates from the brake disk when the operation wire is loosened. Screen curtain device.

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