JP4588746B2 - Shutter curtain lowering device - Google Patents

Description

  The present invention relates to a shutter curtain lowering device that closes the building opening by unwinding and lowering a shutter curtain housed by being wound or the like above the building opening.

  Shutter curtains that open and close by raising and lowering the opening of a building divide the interior and exterior of the shutter curtain by closing the opening. The structure has a predetermined fire prevention performance according to the fire prevention standard.

  This shutter curtain for fire prevention is normally stored in an open state, that is, wound around the top of a building opening, and when opening and closing, the shutter curtain is rewound and wound using an electric motor as a drive source. It can be lifted and closed.

  In the event of a fire, etc., the shutter curtain is lowered to the closed state in order to block the opening. In this closing (lowering) operation, the power supply is not relied upon, that is, winding is performed. The shutter curtain stored in the rotating state operates the brake mechanism in the stored state and does not easily rewind and does not close, but in the event of a fire, the brake mechanism Then, the shutter curtain is lowered by its own weight, and the opening is closed.

In a fireproof shutter or smokeproof shutter, in order to make it easy to lower its own weight, the weight is hung on the lower edge of the smoke screen, or a structure in which a weight is provided at the draining part of the lower edge of the shutter curtain. A structure (Patent Document 2 below) has been proposed.
JP-A-7-259454 Japanese Patent Laid-Open No. 53-16696

However, the weight structure according to Patent Document 1 or 2 has the following problems.

That is , in the configuration of lowering the conventional shutter curtain described above, since the shutter curtain is in a state of being wound at the upper part of the building opening, the center of gravity is not necessarily in the rewinding direction, but at the time of a fire occurrence, For example, even if the brake is released by receiving a signal from a smoke sensor or the like, simply releasing the brake does not start the shutter curtain descending quickly, that is, it may not be able to smoothly transition to the descent operation. There is.

  In particular, when the shutter curtain material is a light material, the start delay of the closing operation due to the weight of the shutter curtain may be significant. And from this, there is a risk of delaying the formation of the fire prevention compartment when a fire occurs.

  Therefore, in order to solve the above problems, the present invention assists the start of the descent of the shutter curtain that descends by its own weight, and more reliably performs the descent without delaying the descent of the shutter curtain. An object of the present invention is to provide a shutter curtain lowering device capable of closing a building opening.

  Next, means for solving the above problems will be described with reference to the drawings corresponding to the embodiments.

The shutter curtain lowering device of the present invention is a shutter curtain lowering device that draws and lowers the shutter curtain 3 housed in the upper part of the building opening from the housed state,
There is provided an urging means by weights 10 and 10 ' for engaging the seat plate member 7 of the shutter curtain 3 and assisting the start of the descent of the shutter curtain 3, and is assisted by the urging means when the descent of the shutter curtain 3 starts. After the shutter curtain 3 starts to descend, and after the shutter curtain 3 begins to descend, the engagement between the assisting means and the seat plate member 7 is released, and the shutter curtain 3 is continuously moved by its own weight. It is drawn out and moved downward with respect to the building opening to close the building opening .

Further, in the shutter curtain lowering device of the present invention, the weight as the assisting means is a state in which a downward load is applied to the seat plate member in a state where the shutter curtain is housed in the shutter curtain housing portion. The shutter curtain is brought into a contact state, and the shutter curtain is assisted by the weight load applied to the seat plate member, and the descent is started .

Further, in the shutter curtain lowering device of the present invention, the weight as the assisting means is a weight suspended by a wire, and one end of the wire is connected to the upper part of the building opening, and is provided at the other end of the wire. The weight is brought into contact with an engagement piece projecting from the lower part of the shutter curtain .

Still further, in the shutter curtain lowering device of the present invention, when the shutter curtain is raised, the weight comes into contact with the seat plate member and comes into a storage state in which it is stored in the upper part of the building opening. It is characterized by that.

Further, the weight as the assisting means is pivotally supported at the upper part of the building opening so as to be swingable about the pivot, and the swinging part of the weight projects from the lower part of the shutter curtain. It is characterized by being brought into a contact state.

  The left and right guide rails for guiding the raising and lowering of the shutter curtain or the surface of the building frame adjacent to the outside of the left and right guide rails are provided with a pair of left and right restricting pieces, and the weights elongated in the left-right direction The shutter curtain can be lowered until both ends are placed on the left and right restricting pieces, and then closed by its own weight.

  The left and right guide rails for guiding the raising and lowering of the shutter curtain are respectively formed with step portions in both groove openings facing each other at a predetermined height position, and the shutter curtain and the weight move up and down above these step portions. Lower the shutter curtain until the both ends of the weight, which is elongated in the left-right direction, are placed on the left and right stepped parts. Can be supported and then closed by its own weight.

  The assisting means is constituted by a spring that is engaged with a part of the shutter curtain in the housed state, assists the start of the shutter curtain descending, and the spring is detached from the shutter curtain after the descending is started. It can be set as the structure made into.

  The assisting means is constituted by a spring that is engaged with a part of the shutter curtain in the holding state, assists the start of the shutter curtain descending, and the spring is detached from the shutter curtain after the descending is started. It can be set as the structure made into.

  The shutter curtain may be configured such that at least the lower edge side is made of a sheet material.

  The shutter curtain may be configured such that at least about 50 to 60 cm on the lower edge side, for example, the lower edge side, is made of a sheet material, for example, a flameproofed sheet material. In this case, a slat curtain made of a strip-like slat member and a panel curtain made of a panel member may be formed on the upper side of the shutter curtain.

Or more shutter curtain drop device according to the present invention described, the shutter curtain is, when starting the descent from the accommodated state, et al or be assisted start of the descent at assisting means, the shutter curtain descent operation It is possible to improve the start.

  Further, by providing the engagement piece on the shutter curtain and providing the assisting means related thereto, the assisting means applies a load to the engaging piece when the shutter curtain starts to descend. The shutter curtain can be lowered through the engagement piece.

  That is, when the shutter curtain is stored in the upper part of the opening of the building, the assisting means or the engagement may be engaged even if the balance of the shutter curtain in the stored state is not in the descending direction for closing. By adopting a configuration in which the piece and the assisting means are provided, the start of the descent of the shutter curtain is more reliably performed and the opening of the building can be closed.

  Further, since the assisting means is configured as a weight, the weight of the shutter curtain is not sufficient, and even if the shutter curtain itself is difficult to start at the start of the descent, the weight of the weight causes the descending direction. Thus, the load can be applied smoothly, and the descent starts smoothly, so that the shutter curtain can be closed more reliably.

  Furthermore, by configuring the weight as described above, one end is connected to the upper part of the building opening, so that the weight is assisted only at the start of the descent of the shutter curtain, and in the closed state after the descent starts, The weight can be detached from the shutter curtain, so that the weight of the shutter curtain itself does not change, that is, the load on the lower side of the shutter curtain by the shutter curtain during the closing operation and in the closed state is increased. There is no.

  In addition, according to the shutter curtain lowering device of the present invention, the start of the lowering of the shutter curtain is assisted regardless of the weight of the shutter curtain. Even for shutter curtains with different weight balance in the height direction of the shutter curtain, which is considered to be lightweight, the descent starts more reliably, and the building opening is closed with the shutter curtain. Is possible.

The shutter curtain lowering device of the present invention is provided in a fire prevention shutter device used for fire prevention when a fire occurs.
This fire shutter device is a shutter device that is applied to a fire prevention zone according to the Building Standard Law Enforcement Order and automatically closes a shutter curtain by a sensor (sensor) that detects smoke or heat.

This shutter device 1 is provided with a shutter housing portion 2 such as a shutter case above a building opening as an opening portion of a space or the like that needs to form a building entrance / exit, a fire prevention compartment, and the like. A winding shaft 4 for winding the curtain 3 is provided.
The take-up shaft 4 is rotated with an electric motor (not shown) as a drive source, and the shutter curtain 3 is taken up and rewound with respect to the take-up shaft 4 by this rotation, that is, the shutter is stored. It is drawn out or accommodated from the part 2 and moves up or down with respect to the building opening to be opened or closed.
In the storage state in which the shutter curtain 3 is wound around the winding shaft 4, the lower edge of the shutter curtain 3 is positioned at the slit-shaped entrance / exit 5 formed on the lower surface of the shutter storage portion 2.

  In addition, although not shown in the figure, the drive mechanism portion constituted by the electric motor and the take-up shaft 4 is provided with a brake mechanism, and when the shutter curtain 3 is taken up and stored, The shutter curtain 3 is held so as not to be fed out without rotating the take-up shaft 4.

Further, this brake mechanism is connected to an automatic closing device constituting a shutter curtain lowering device together with an engagement piece and an assisting means described later.

  This automatic closing device is connected to a control panel including a sensor for detecting smoke and heat, and releases the rotation-blocking state of the winding shaft 4 by the brake mechanism based on a detection signal from the sensor. That is, the take-up shaft 4 can be rotated, whereby the shutter curtain 3 can be rewound, and the shutter curtain 3 is lowered and closed by its own weight.

  Further, the shutter curtain 3 in this embodiment is composed of a slat curtain portion 3A made of a slat member and a sheet curtain portion 3B made of a sheet material 6.

  The slat member constituting the slat curtain portion 3A is made of a plate material made of, for example, a steel plate formed in a substantially strip-like plate shape, and the slat curtain portion 3A is configured by connecting the upper and lower edges of the slat member to each other and continuously. Has been.

  In addition, the sheet material 6 constituting the seat curtain portion 3B is made of a non-combustible material or a semi-incombustible material subjected to a flameproofing treatment, such as a fireproof fabric treated with a flameproofing chemical or the like and having a characteristic of being difficult to flame. Or a flame-retardant material such as silica cloth or glass cloth.

  The shutter curtain 3 is configured by connecting a seat curtain portion 3B to a lower portion of the slat curtain portion 3A. The seat curtain portion 3B has a height of 50 to 60 cm in the present embodiment. ing.

As shown in FIGS. 1 and 2, a seat plate member 7 is disposed at the lowermost edge of the sheet curtain portion 3 </ b> B constituting the shutter curtain 3.
The seat plate member 7 is composed of a plate portion 8 and an engagement piece 9, and the plate portion 8 is formed at the lower edge portion of the sheet material 6 of the seat curtain portion 3B as shown in FIG. The bag portion 6a is inserted and disposed.

Further, the engagement piece 9 constitutes a shutter curtain lowering device together with assisting means to be described later, and has a vertical portion 9a and a horizontal portion 9b as shown in FIG. The vertical portion 9 a is fixed to the plate portion 8 along the plate portion 8, and the horizontal portion 9 a protrudes in the horizontal direction with respect to the plate portion 8.

  The seat plate member 7 is not heavy in weight, and is set to such an extent that the sheet material 6 of the seat curtain portion 3B that is suspended from the slat curtain portion 3A is in a stretched state. The tip edge of the horizontal portion 9b is preferably bent or curved at a desired angle as shown in FIG.

Next, the weight 10 as the assisting means constituting the shutter curtain lowering device of the present invention is disposed in the lintel 11 constituting the lower part of the shutter housing portion 2.

  As shown in FIGS. 2 and 3, the weight 10 is formed in a substantially rectangular block shape, and one end in the longitudinal direction is pivotally supported on the lintel 11 by a substantially horizontal pivot 12. It can be swung freely around.

Further, a contact roller 13 is disposed at the other longitudinal end of the weight 10.
As shown in FIG. 3, the contact roller 13 is preferably disposed so as to protrude through the bracket 14 with respect to the other end of the weight 10.

Further, a regulation pin 15 that regulates the swing angle of the weight 10 is disposed on the lintel 11.
The restriction pin 15 is arranged in parallel with the pivot shaft 12 and abuts against the side surface of the weight 10 so that the swing angle of the weight 10 is not changed from a substantially horizontal state to a substantially vertical state, preferably a vertical state. Regulation is made within about 90 ° of a slightly inclined state (broken line in FIG. 3).

  The weight 10 has an engagement piece 9 of the seat plate member 7 which is the lowermost edge of the shutter curtain 3 in a state where the shutter curtain 3 is wound around the winding shaft 4 and stored in the shutter storage portion 2. (See FIG. 1).

  In this contact state, as shown in FIG. 3, the contact roller 13 at the other end of the weight 10 is placed on the upper surface of the horizontal portion 9b of the engagement piece 9 with the longitudinal direction being substantially horizontal, that is, this engagement state. The joint piece 9 is in a cantilevered state and is in a state where a load is applied downward.

  Therefore, when the shutter curtain 3 is housed, that is, wound around the winding shaft 4, when a fire or the like occurs and the automatic closing device operates to release the brake mechanism, the winding shaft 4 The rotation becomes free.

  The shutter curtain 3 wound around the winding shaft 4 has a weight 10 placed on the engagement piece 9 at the lowermost edge, and the load of the weight 10 is applied downward. The engagement piece 9 is urged downward.

  As a result, the shutter curtain 3 is assisted by the load of the weight 10 applied to the engagement piece 9 and starts to descend, and the shutter curtain 3 is continuously drawn out by the start of the descending, and thereafter, by its own weight, The shutter curtain 3 is automatically closed.

  In particular, in the present embodiment, since the lower part of the shutter curtain 3 is made of a lightweight sheet material 6, the center of gravity is not on the closed side where the shutter curtain 3 is fed out when the shutter curtain 3 is wound around the winding shaft 4. However, the weight 10 assists the start of the rotation of the winding shaft 4, and the shutter curtain 3 is reliably guided in the closing direction.

  The weight 10 is rotated while applying the load to the engagement piece 9, and is biased in the closing direction of the shutter curtain 3 while being in a substantially vertical state and abutting the restriction pin 15. On the other hand, when the engagement piece 9 is disengaged, the weight 10 is suspended from the pivot 12 (see the broken line in FIG. 3).

  When the shutter curtain 3 is opened, that is, when the shutter curtain 3 is lifted, the shutter 10 is wound up by the rotational driving force of the winding shaft 4, and the weight 10 comes into contact with the engagement piece 9 and is placed on the engagement piece 9. Thus, it rotates about the pivot 12 and the contact roller 13 at the other end is lifted while rolling, and is in an initial state, that is, a substantially horizontal state along the lintel 11 (FIG. 3).

In the above-described embodiment, the number of the weights 10 serving as the assisting means is not described. However, the weights 10 may be composed of a plurality of weights. By providing 10 on the lintel 11, it is possible to more reliably assist the start of the descent from the housed state of the shutter curtain 3.

Further, in the above-described embodiment, an example in which the weight 10 constituting the assisting means is configured to support one end and the load of the weight 10 is applied to the engaging piece 9 in a cantilever manner has been described. As shown in FIG. 6, the weight 10 ′ suspended by the wire 20 may be used.

  In the configuration in which the weight 10 ′ is suspended by the wire 20, the weight 10 ′ has a prismatic structure, and as shown in FIG. 4, the weight 10 ′ extends over the entire width of the engagement piece 9 at the lowermost edge of the shutter curtain 3. It is set as the structure which mounts.

Also, one end of a pair of left and right wires 20 is connected to the vicinity of both ends in the longitudinal direction of the weight 10.
For example, as shown in FIG. 5, these wires 20 are hooked on pulleys disposed in the lower plate 2 a portion in the shutter storage portion 2, and the other ends are fixed to the lower plate 2 a via brackets or the like. It is like that.

  The shutter curtain lowering device having the wire and the pulley will be described in detail. The lower plate 2a of the shutter storage unit 2 is located near both ends in the width direction of the shutter curtain 3, and the shutter curtain of the shutter storage unit 2 is provided. In the vicinity of the entrance / exit 5, vertical pulleys 21 having horizontal axes are provided in pairs. Further, horizontal pulleys 22 corresponding to the paired vertical pulleys 21 and having a vertical axis located in the back with respect to the entrance / exit 5 are provided as a pair. Further, a stopper bracket 23 and a fixed bracket 24 are disposed on the lower plate 2a in pairs corresponding to the wires 20, respectively.

  Then, as shown in FIG. 6, the wires 20 are put on the vertical pulleys 21 and the horizontal pulleys 22 so that the wires 20 are L-shaped on the lower plate 2 a, and the other ends of the wires 20 are passed through the stopper bracket 23. One end of the turnbuckle 25 is connected to the end. One end of the tension coil spring 26 is connected to the other end of the turnbuckle 25, and the other end of the tension coil spring 26 is connected to the fixed bracket 24.

  According to this configuration, from the state where the shutter curtain 3 is wound and accommodated on the take-up shaft 4, that is, the state where the brake mechanism operates and the accommodation state is maintained, the release is released due to a fire or the like. When the rotation of the winding shaft 4 becomes free, the engagement piece 9 is urged downward by the load of the prismatic weight 10 ′ placed on the engagement piece 9 at the lower edge of the shutter curtain 3. That is, the shutter curtain 3 is closed and the start of the descent is assisted.

  Then, while the tension coil spring 26 reaches a predetermined extension length, the shutter curtain 3 is moved and assisted in the downward direction through the engagement piece 9 until the turnbuckle 25 comes into contact with the stopper bracket 23. Then, the weight 10 ′ is suspended by the wires 20 and detached from the engagement piece 9, and the subsequent shutter curtain 3 continues to descend due to its own weight and is closed.

  Further, when the shutter curtain 3 is opened, the engagement piece 9 operates to lift the weight 10 ′, the weight 10 ′ is raised, and each wire 20 is not loosened by pulling by the tension coil spring 26. .

  Even in this example, the lower part of the shutter curtain 3 is composed of a lightweight sheet material 6 and is wound around the winding shaft 4, and the weight is not required to be on the closing side where the shutter curtain 3 is extended. The start of rotation of the winding shaft 4 is assisted by 10 ', and the shutter curtain 3 is surely guided in the closing direction.

Further, as another example of the example in which the assisting means of each embodiment described above is the weight 10, 10 ′, for example, the assisting means is formed in a substantially prismatic shape similar to the above, as shown in FIG. A wire reel 30 having an urging force for constantly winding the wire 20 is provided in the vicinity of both ends of the weight 10 ′, and the tip of the wire 20 extending from the wire reel 30 is a shutter storage portion. The wire 20 fixed to the second side, that is, the wire 20 having the weight 10 ′ in the suspended state may be configured to be able to advance and retreat from the weight 10 ′ side, and the wire 20 may be wound around and stored in the wire reel 30. Further, as shown in FIG. 7B, the wire reel 30 may be disposed in the shutter housing portion 2 and the weight 10 ′ may be fixed to the tip of the wire 20.

Furthermore, as an example in which the assisting means is constituted by a weight, it may be configured as shown in FIG. 8A, FIG. 8B, or FIG.

  In the example shown in FIG. 8A, the weight 10 ′ is formed in a substantially prismatic shape as in the above embodiment, and both ends are positioned between the left and right guide rails 31 that guide the raising and lowering of the shutter curtain 3. In other words, it is formed in a length slightly shorter than the frontage width, and when the shutter curtain 3 is wound and stored, it is placed on the engagement piece 9 and is engaged downward by the load of the weight 10 '. The piece 9 is energized. Further, the left and right guide rails 31 have a structure in which a pair of left and right restricting pieces 32 project inwardly on surfaces facing each other at a predetermined height position.

  In the example shown in FIG. 8B, as described above, the weight 10 ′ is formed in a substantially prismatic shape and is formed to be equal to or slightly longer than the interval width of the left and right guide rails 31. In a state where it is wound and stored, it is placed on the engagement piece 9 and the engagement piece 9 is biased downward by the load of the weight 10 '. In addition, a structure in which a pair of right and left restricting pieces 32 project from the left and right guide rails 31 or one surface of the building housing adjacent to the outside of the guide rails 31 facing the outdoors or indoors at a predetermined height position. And

  Further, in the example shown in FIG. 9, the weight 10 ′ is formed in a substantially prismatic shape, and both ends are formed to have a length located in the left and right guide rails 31 that guide the raising and lowering of the shutter curtain 3. In a state in which is wound and stored, the engagement piece 9 is placed on the engagement piece 9, and the engagement piece 9 is biased downward by the load of the weight 10 '. Further, the left and right guide rails 31 are respectively formed with paired step portions 33 in both groove openings facing each other at a predetermined height position, and the shutter curtain 3 and the weight 10 ′ above the step portions 33. The wide portion 31a moves up and down, and the lower portion of the step 33 is configured as a narrow portion 31b where only the shutter curtain 3 moves up and down.

  In the configuration of the example as described above, when the brake mechanism is released, the shutter curtain 3 is assisted by the load of the weight 10 ′ and is lowered together with the weight 10 ′. Until the both ends are placed on the regulating piece 32 or the stepped portion 33, the shutter curtain 3 is assisted in the lowering operation. When the weight 10 ′ is placed on the regulating piece 32 or the stepped portion 33, the weight 10 ′ is released from the engaging piece 9, and then the shutter curtain 3 continues to descend by its own weight and is closed.

  Further, when the shutter curtain 3 is opened, the engagement piece 9 lifts the weight 10 'on both the restricting pieces 32 (both step portions 33), and rises together with the weight 10' to be opened.

  The restricting piece 32 may be arranged in the groove of the guide rail 31. In this case, the groove opening portion of the guide rail 31 as shown in FIG. Further, the weight 10 ′ in the example shown in FIGS. 8A, 8B, and 9 is not connected to the shutter housing portion 2 or the shutter curtain 3, so that it is suspended by the wire 20 described above. By combining with the configuration of the state, it is possible to prevent problems such as dropping of the weight 10 ′ with the wire 20 and the restriction piece 32 (step portion 33).

  Further, in each of the above-described embodiments, the weights 10 and 10 ′ are configured to be positioned only on one surface side of the shutter curtain 3. 10 and 10 'may be positioned. In this case, a load in the lowering direction can be obtained, and the lowering of the shutter curtain 3 can be more surely supported, and the shutter curtain 3 can be closed ( It is possible to make the start to (descent) smooth and quick.

Further, in each of the above-described embodiments, the example in which the shape of the weight 10 ′ as the assisting means is configured as a prismatic shape has been described. Saddle shape, cross-sectional shape is not continuous in the longitudinal direction, for example, a shape in which a plurality of locations at both ends and midway are rectangular in cross-section and other portions are circular in cross-section, a shape that is not straight in the longitudinal direction, etc. It will never be done.

  Further, in each of the above-described embodiments, the assisting means is configured as the weights 10 and 10 ′, and the start of the descent of the shutter curtain 3 is assisted by combining the weights 10 and 10 ′ and the engagement piece 9. In addition to these configurations, any other configuration may be used as long as it assists the start of the descent of the shutter curtain 3.

  That is, it is only necessary to provide assistance means for assisting the descent of the shutter curtain at the start of the descent.

  As the assisting means, as in the above-described embodiments, the shutter curtain is engaged with the shutter curtain to assist the start of the descent of the shutter curtain, for example, one shutter curtain in the housed state. A spring that is engaged with the part is provided in the guide rail or in the shutter housing part, and the pulling force or pressing force of the spring is used at the start of the descent to assist the start of the descent. A structure in which the support means is connected to the shutter curtain, for example, one that is detached from the shutter curtain, for example, one end is connected to the lower edge of the building opening, and the other end is connected to the shutter curtain so that the tension spring is placed in the guide rail. When the shutter curtain is wound and stored, the pulling force of the tension spring is generated. When the holding state is released, the pulling force of the tension spring assists the start of the shutter curtain descent, and after the descent starts, the pulling force of the tension spring is released. Is not to be done.

  Furthermore, in the above-described embodiment, the shutter curtain structure is a sheet curtain portion 3B having a lower portion made of a sheet material 6 and an upper portion being a slat curtain portion 3A made of a slat member. It is not limited to this, It is good also as a shutter curtain comprised by the shutter curtain comprised entirely with a sheet material, the shutter curtain comprised only by the slat member 3, and also the panel board.

  In the above-described embodiment, an example of a configuration in which the shutter curtain 3 is housed by being wound by the winding shaft 4 has been described. However, the shutter curtain 3 is not limited to this. For example, it is good also as a thing of the structure accommodated by raising a shutter curtain upwards with respect to the opening of a building.

Schematic side sectional view showing a shutter device provided with a shutter curtain lowering device according to the present invention. The side view which shows one Embodiment of the shutter curtain descent | fall apparatus by this invention Front view of the shutter curtain lowering device Front view of a shutter device including a shutter curtain lowering device according to another embodiment Side view of shutter curtain lowering device of other embodiment Plan view (A) Front view of a shutter device including a shutter curtain lowering device according to another embodiment (b) Front view of a shutter device including a shutter curtain lowering device according to another embodiment (A) Front view of a shutter device including a shutter curtain lowering device according to another embodiment (b) Front view of a shutter device including a shutter curtain lowering device according to another embodiment Side view of a shutter device including a shutter curtain lowering device according to another embodiment

3 ... shutter curtain 6 ... sheet material 9 ... engagement piece 10, 10 '... assisting means (weight)

Claims (8)

A shutter curtain lowering device that draws and lowers the shutter curtain stored in the upper part of the building opening from the storage state,
There is provided a supporting means by a weight that engages with the seat plate member of the shutter curtain and assists the start of the descent of the shutter curtain. At the start of the descent of the shutter curtain, the descent of the shutter curtain is started by the assisting means. After the descent of the shutter curtain is started, the engagement between the assisting means and the seat plate member is released, and the shutter curtain is continuously drawn out by its own weight, and moves downward with respect to the building opening. A shutter curtain lowering device characterized in that a building opening is closed. The weight as the assisting means is in a contact state when a load is applied downward to the seat plate member in a state where the shutter curtain is housed in the shutter curtain housing portion. The shutter curtain lowering device according to claim 1, wherein the lowering is started by being assisted by a weight load applied to the member. The weight as the assisting means is a weight suspended by a wire, one end of the wire is connected to the upper part of the building opening, and a weight provided at the other end of the wire is projected from the lower part of the shutter curtain. The shutter curtain lowering device according to claim 1, wherein the shutter curtain lowering device is brought into contact with the engaging piece. The weight as the assisting means is pivotally supported at the upper part of the opening of the building so as to be swingable about a pivot, and the swinging part of the weight is in contact with an engaging piece protruding from the lower part of the shutter curtain. The shutter curtain lowering device according to claim 1, wherein the shutter curtain lowering device is in a contact state. The left and right guide rails for guiding the raising and lowering of the shutter curtain or the surface of the building frame adjacent to the outside of the left and right guide rails are provided with a pair of left and right restricting pieces, and the weights elongated in the left-right direction 4. The shutter curtain lowering device according to claim 1, wherein the shutter curtain descending is assisted until both ends thereof are placed on the left and right restricting pieces, and thereafter closed by its own weight. . The left and right guide rails for guiding the raising and lowering of the shutter curtain are respectively formed with step portions in both groove openings facing each other at a predetermined height position, and the shutter curtain and the weight move up and down above these step portions. Lower the shutter curtain until the both ends of the weight, which is elongated in the left-right direction, are placed on the left and right stepped parts. The shutter curtain lowering device according to claim 1, wherein the shutter curtain is closed by its own weight. 6. When the shutter curtain is raised, the weight comes into contact with the seat plate member and comes into a storage state in which the weight is stored in the upper part of the building opening. A shutter curtain lowering device according to claim 1. The shutter curtain has a structure in which a seat curtain portion made of a sheet material is connected to a lower portion of a slat curtain portion made of a steel material, and the weight of the seat plate member provided at the lower portion of the seat curtain portion is suspended. The shutter curtain lowering device according to any one of claims 1 to 7, wherein the shutter curtain lowering device is set to such an extent that the sheet material of the seat curtain portion in the lower state is in a stretched state.

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