KR101312338B1 - Obstacle detector for motorized shutter and motorized shutter with obstacle detector - Google Patents

Abstract

(Problem) Provides an obstacle detecting device for an electric shutter having high sensitivity and high reliability and does not allow any flame to escape from one side of the fire shutter in the event of a fire, and is provided with such an obstacle detecting device. It is to provide an electric shutter.

(Solution)

The obstacle detecting device has a flexible edge member 24 attached to the bottom edge of the shutter curtain 12 and extending along almost the entire length of the bottom edge of the shutter curtain 12. In the vicinity of one end portion of the edge member, a laser beam injection machine 34 for projecting a laser beam in the longitudinal direction of the edge member is located through the hollow space 30 formed in the edge member. In the vicinity of the other end of the edge member, an optical sensor 40 that receives the laser beam is located. When the edge member is deformed and crushed by an external force, the laser beam is blocked by the edge member, thereby preventing the incident to the optical sensor. The edge member is formed of a flame retardant elastomer.

Electric shutter, obstacle detection device, edge member, shutter curtain, bottom edge, light beam projection means, light sensor, base part, tubular part, wing part

Description

OBSTACLE DETECTOR FOR MOTORIZED SHUTTER AND MOTORIZED SHUTTER WITH OBSTACLE DETECTOR}

The present invention relates to an obstacle detecting device for use in an electric shutter provided with a metal shutter curtain and an electric lifting mechanism for elevating the shutter curtain. The present invention also relates to an electric shutter having such an obstacle detecting device.

BACKGROUND ART Electric shutters equipped with metal shutter curtains and electric lifting mechanisms for lifting the shutter curtains are widely used. As a typical example of such a shutter, there exists an electric hoisting shutter etc., for example. Electric hoist shutters are used as entrances to buildings, gate shutters for facilities, and the like. Electric hoist shutters are also widely used as fire shutters. Many recent fire shutters consist of a motorized shutter with a fire sensor and a controller to provide automatic operation. In the event of a fire, when the fire sensor detects high temperature and / or smoke, the electric shutter automatically operates to lower the shutter curtain to the closed position.

In general, the electric shutter having a metal shutter curtain preferably has an obstacle detecting device provided at the bottom edge of the shutter curtain. This configuration makes it possible to detect any obstacle, especially the human body, which can be caught between the bottom edge of the shutter curtain and the floor when the shutter curtain is recommended and lowered. By using such an obstacle detection device, such an obstacle detection device is particularly necessary for an automatically operated fire shutter so that the bottom edge of the shutter is in contact with the obstacle. Examples of obstacle detection devices for use in electric shutters are disclosed in Japanese Patent Laid-Open Nos. 10-238261 and 2000-54765.

Patent publication 1: Japanese Patent Laid-Open No. 10-238261

Patent Publication 2: Japanese Patent Publication No. 2000-54765

(Problems to be Solved by the Invention)

From the safety point of view, the moving speed of the shutter curtain of the self-acting fire shutter should be kept below a certain speed. However, typical conventional fire shutters configured to be self-acting have shutter curtains that operate at a travel speed that is too lower than the safety limit speed. In order to speed up the operation of the automatic actuation fire shutter while ensuring stability, an obstacle detecting device having high sensitivity and high reliability is required. At the same time, the obstruction detection device for use in the fire shutter should not allow the escape of the flame which occurs when the obstruction detection device in the fire can be damaged by the flame. It has been difficult to meet these requirements with conventional obstacle detecting devices for electric fire shutters.

In view of these circumstances, when used in an electric fire shutter having high sensitivity and high reliability, an obstacle detecting device for use in an electric shutter that does not allow escape of any flame from one side of the fire shutter to the other is provided. It is an object of the present invention.

Moreover, it is another object of this invention to provide the electric shutter provided with such an obstacle detection apparatus.

(MEANS FOR SOLVING THE PROBLEMS)

In order to achieve this object, according to the first aspect of the present invention, there is provided an obstacle detecting device for use in an electric shutter having a metal shutter curtain and an electric lifting mechanism for elevating the shutter curtain. The obstacle detecting device has a flexible edge member attached to the bottom edge of the shutter curtain and extending along almost the entire length of the bottom edge of the shutter curtain. The edge member defines a hollow space extending therein in its longitudinal direction. The obstacle detecting device is provided with light beam projection means positioned near one end of the edge member and projecting a light beam in the longitudinal direction of the edge member through the hollow space of the edge member. The obstacle detecting device has an optical sensor positioned near the other end of the edge member and receiving a light beam from the light beam projection means through the hollow space of the edge member. When the edge member is deformed and crushed by an external force, the light beam projected from the light beam projection means is blocked by the crushed edge member, thereby preventing the incident to the optical sensor. The edge member is formed of a flame retardant elastomer that is fixed to the lower edge of the shutter curtain without burning when exposed to high temperature in a fire.

According to a second aspect of the present invention, there is provided a metal shutter curtain, an electric lifting mechanism for elevating the shutter curtain, a controller for controlling the operation of the electric lifting mechanism, and an obstacle detecting device equipped at a lower edge of the shutter curtain. An electric shutter is provided. The obstacle detecting device has a flexible edge member attached to the bottom edge of the shutter curtain and extending along almost the entire length of the bottom edge of the shutter curtain. The edge member defines a hollow space extending therein in its longitudinal direction. The obstacle detecting device is provided with light beam projection means positioned near one end of the edge member and projecting a light beam in the longitudinal direction of the edge member through the hollow space of the edge member. The obstacle detecting device has an optical sensor positioned near the other end of the edge member and receiving a light beam from the light beam projection means through the hollow space of the edge member. When the edge member is deformed and crushed by an external force, the light beam projected from the light beam projection means is blocked by the crushed edge member, thereby preventing the incident to the optical sensor. The edge member is formed of a flame retardant elastomer that is fixed to the bottom edge of the shutter curtain without burning when exposed to high temperature in a fire. The controller may further include: i) stopping the drop of the shutter curtain or moving the shutter curtain downward when the light beam projected by the optical sensor while the shutter curtain falls is blocked. The motorized elevating mechanism is controlled to invert upward, and ii) thereafter is programmed to control the motorized elevating mechanism such that when the light beam enters the optical sensor again, the controller starts to descend the shutter curtain.

(Effects of the Invention)

The obstacle detecting device according to the present invention has a flexible edge member attached to the bottom edge of the shutter curtain. When the light beam passing through the edge member is blocked, the deformation of the flexible edge member can be detected, so that the obstacle detecting device can have high sensitivity and high reliability. In addition, since the edge member is made of a flame retardant elastomer that does not burn when exposed to high temperatures in a fire and adheres to the bottom edge of the shutter curtain, the edge member is formed with the bottom edge of the closed (dropped) shutter curtain. Adheres to both floor surfaces, sealing the gap between the bottom edge of the shutter curtain and the floor surface, thereby not allowing any flame to escape from one side of the shutter to the other.

1A is a front view of an electric hoist shutter provided with an obstacle detecting device according to a preferred embodiment of the present invention, FIG. 1B is a side view of an electric hoist shutter, and FIG. 1C is a cross-sectional plan view of the electric hoist shutter taken along line CC of FIG. 1A. to be.

FIG. 2A is a cross-sectional view of the bottom edge of the shutter curtain shown in FIG. 1A and the edge member attached thereto, and FIG. 2B is a cross-sectional view similar to FIG. 1A showing the shutter curtain fully lowered to the lowest position.

3 is an enlarged front view of the first end of the bottom edge of the shutter curtain.

4 is an enlarged front view of the second end of the bottom edge of the shutter curtain.

5 is a cross-sectional view of the bottom edge of the shutter curtain and the edge member attached thereto according to the modification of the present invention, showing the state in which the shutter curtain is completely lowered to the lowest position.

(Explanation of drawing)

10 electric hoist shutter

12 shutter curtain

14 shutter box

21 controller

22 slats

24 edge members

28 Tubular part of the edge member

30 hollow space

32 Wing members of the edge member

34 Laser Beam Injection Machine (Light Beam Projection Means)

40 Light Sensor

52 slats

54 Edge member

55 wing member

56 hollow space

(Best Mode for Carrying Out the Invention)

EMBODIMENT OF THE INVENTION Preferred embodiment of this invention is described, referring an accompanying drawing below. 1A to 1C show a preferred embodiment of the present invention, and FIG. 1A is a front view of the electric hoist shutter 10 provided with an obstacle detecting device, and FIG. 1B is a side view of the electric hoist shutter 10, FIG. 1C. Is a cross-sectional plan view of the electric hoist shutter 10 along the CC line of FIG. 1A. As shown in FIGS. 1A-1C, the electric hoist shutter 10 includes a shutter curtain 12, a shutter box 14 fixedly mounted to a part of a building, and a pair of fixedly mounted parts of a building. It is provided with the prop 16 extended perpendicularly. The strut 16 consists of a hollow steel column. The hoisting shutter 10 is also provided with a pair of guide rails 18 extending perpendicularly, and these guide rails 18 are accommodated in and fixed to the hollow support 16.

The electric hoist shutter 10 further includes an electric hoisting mechanism (winding mechanism) 20 which winds and unwinds the shutter curtain 12 to lift the shutter curtain 12. This electric lifting mechanism 20 is housed in the shutter box 14. The electric hoist shutter 10 also has a controller 21 for controlling the operation of the electric lifting mechanism 20. The controller 21 has an electronic circuit 21a having a combination of a microcomputer and a power regulator for controlling the electric power supplied to the electric lifting mechanism 20, and an operator inputs various commands to the electronic circuit 21a. And a fire sensor 21c such as, for example, a temperature sensor and / or a smoke sensor. The electronic circuit 21a, the input device 21b, and the fire sensor 21c are shown only schematically in FIG. 1B.

The shutter curtain 12 includes a plurality of metal slats 22 extending in the horizontal direction, similar to the shutter curtains of many conventional hoisting shutters, and the plurality of metal slats 22 are arranged to be connected up and down with each other. As a result, a rollable metal shutter curtain is formed. Although the shutter curtain of many conventional hoist shutters consists of steel slats, the slats 22 of the shutter curtain 12 shown in Figs. 1A to 1C have a predetermined length of extruded aluminum profile material, i. It is formed of an elongated material made of an alloy. However, the obstacle detecting device according to the present invention is not limited to the shutter curtain made of aluminum slats. Indeed, the present invention can be applied to electric hoist shutters with shutter curtains made of forced slats, and in addition to many other types of electric shutters.

The obstacle detecting device according to the present invention has a flexible edge member 24 made of a flame retardant elastomer, which is attached to the bottom edge of the shutter curtain 12 and extends along almost the entire length of the bottom edge of the shutter curtain 12. have. In addition, since both side edges of the shutter curtain 12 are housed in the hollow strut 16, the edge member 24 need not extend to reach both side edges of the shutter curtain 12. It is sufficient that the edge member 24 extends along the bottom edge of the shutter curtain 12 in a range that is exposed at least outside the strut 16. The flame-retardant elastomer forming the edge member 24 is a material having a characteristic of being fixed to the lower edge of the shutter curtain 12 without burning when the edge member 24 is exposed to high temperature during a fire. Suitable flame retardant elastomers include, but are not limited to, chloroprene rubber and silicone rubber.

2A and 2B are cross-sectional views showing the bottom edge of the shutter curtain 12 to which the edge member 24 is attached, respectively, and FIG. 2B shows the shutter curtain 12 completely lowered to the lowest position. 3 and 4 are enlarged front views of the first and second ends of the bottom edge of the shutter curtain 12, respectively. In each of the figures of FIGS. 2A, 2B, 3 and 4, a portion of the bottom slat 22 of the shutter curtain 12 is shown. The edge member 24 attached to the bottom slat 22 of the shutter curtain 12 is formed of an extruded elastomeric profile material of a certain length, ie a long material made of flame retardant elastomer with a constant cross-sectional shape. The cross-sectional shape of the edge member 24 will have the shape that is most beneficial for its purpose.

As shown in FIGS. 2A and 2B, the edge member 24 is formed on the base portion 25 which is held in contact with the lowermost slat 22 of the shutter curtain 12, and the upper surface of the base portion 25. The engaging part 26 is provided. A pair of opposing grooves is formed between the upper surface of the base portion 25 and the lower surface of the engaging portion 26. The pair of grooves of the edge member 24 accommodate the pair of edges of the slats protruding inward, and the edge member 24 is fixed to the slats 22.

The edge member 24 also has a tubular portion 28 formed below the base portion 25. The tubular portion 28 has a lower wall having a semi-cylindrical cross section and defines a hollow elongated space 30 extending in the longitudinal direction of the edge member 24 in the edge member 24.

The edge member 24 also has a pair of wing portions 32 formed on both sides of the tubular portion 28, and the pair of wing portions 32 extend downward from the base portion 25. It protrudes toward and reaches the height below the lowest part of the tubular part 28. As shown in FIG. The blade portion 32 covers and protects the tubular portion 28 when the shutter curtain 12 is completely lowered to the lowest position (see Fig. 2B). With this configuration, when the shutter curtain 12 is lowered at the time of fire, the wing portion 32 functions to protect the tubular portion 28 from damage caused by the heat of the fire, thereby lowering the wall of the tubular portion 28. This may have a very thin thickness as detailed below.

The electric hoist shutter 10 has a limit mechanism (not shown) for stopping the movement of the shutter curtain when the uppermost position is reached when the shutter curtain moves upward and when the lowermost position is reached when the shutter curtain moves downward. have. This limit mechanism is electrically connected to the controller 21 (refer FIG. 1B), and provides an electric signal to the controller 21 which shows when the shutter curtain 12 reached the uppermost position and the lowermost position. This kind of limit mechanism is generally found in many conventional electric hoist shutters and will not be described in detail here. When the shutter curtain 12 is in the lowest position, the relative position of the floor surface FL with respect to the bottom edge of the shutter curtain 12 is shown in Figs. 2B, 3 and 4, wherein the floor surface ( There is a small gap between FL) and the lower surface of the tubular portion 28 of the edge member 24.

In general, when the shutter curtain 12 is completely lowered to the lowest position, the relative position of the floor surface FL with respect to the bottom edge of the shutter curtain 12 is such that the floor surface FL is tubular of the edge member 24. It may be set to be at approximately the same height as the height of the lower surface of the upper 28. Therefore, it is not necessary that a small gap exists between the floor surface FL and the lower surface of the tubular portion 28 of the edge member 24. In other words, when the shutter curtain 12 is in the lowermost position, the floor surface FL and the lower surface of the tubular portion 28 of the edge member 24 may be set to contact each other, and the floor surface FL and It may be set such that a relatively large gap exists between the lower surfaces of the tubular portion 28 of the edge member 24. It is only important to ensure that the lower edge of the wing 32 contacts the floor surface FL to cover and protect the tubular 28.

Nevertheless, the relative position of the floor surface FL with respect to the lower edge of the shutter curtain 12 shown in Figs. 2B, 3 and 4 does not allow the tubular portion 28 to contact the floor surface FL. Thus, even after the shutter curtain 12 is held at the lowermost position for a long time, it is very advantageous because no creep is generated in the semi-cylindrical lower wall of the tubular portion 28.

At the first end of the lower edge of the shutter curtain 12 shown in Fig. 3, a light beam projection means composed of a laser beam ejector 34 is provided. This laser beam injection machine 34 is located near one end of the edge member 24 and is fixed to the lowermost slat 22 of the shutter curtain 12 via the bracket 36. The laser beam injection machine 34 is a compact device having a laser diode, and projects a light beam (here laser beam) 38 in the longitudinal direction of the edge member 24 through the hollow space 30 of the edge member 24. Is oriented so as to

At the second end of the bottom edge of the shutter curtain 12 shown in FIG. 4, it is located near the other end of the edge member 24 and secured to the lowest slat 22 of the shutter curtain 12 via the bracket 42. An optical sensor 40 is provided. The optical sensor 40 is oriented to receive the laser beam 38 from the laser beam ejector 34 through the hollow space 30 of the edge member 24.

During operation of the electric hoisting shutter 10 which lowers the shutter curtain 12, an obstacle, in particular a human body, may be caught between the lower edge of the shutter curtain 12 and the floor surface FL. If this happens, an external force from the obstacle is imparted to the lower wall of the tubular portion 28 of the edge member 24, thereby causing deformation and crushing of the portion of the edge member 24 which comes into contact with the obstacle. do. Whenever a portion of the tubular portion 28 is crushed, the laser beam 38 projecting from the laser beam injection machine 34 is blocked by the crushed portion of the tubular portion 28, so as to the optical sensor 40. Incidents are disturbed.

The laser beam injection machine 34 and the optical sensor 40 are electrically connected to the controller 21 (see FIG. 1B). When the shutter curtain 12 begins to descend, the controller 21 activates the laser beam ejector 34 to start projecting the laser beam 38 and at the same time starts monitoring the output of the light sensor 40. do. The controller 21 is programmed as follows. If the laser beam 38 projected by the optical sensor 40 is blocked while the shutter curtain 12 falls, and the output of the optical sensor 40 is extinguished, the controller 21 moves on the electric lifting mechanism 20. ), The descent of the shutter curtain 12 is stopped. After that, when the laser beam 38 enters the optical sensor 40 again, the controller 21 controls the electric lifting mechanism 20 to resume the drop of the shutter curtain 12.

Alternatively, the controller 21 can be programmed as follows. If the laser beam 38 projected by the optical sensor 40 is blocked while the shutter curtain 12 falls, and the output of the optical sensor 40 is extinguished, the controller 21 moves on the electric lifting mechanism 20. ) Is controlled to reverse the moving direction of the shutter curtain 12 so as to be downward from upward. After that, when the laser beam 38 is incident again to the optical sensor 40, the controller 21 controls the electric lifting mechanism 20 to reverse the moving direction of the shutter curtain 12 again so that it moves upwards and downwards. The descent of the shutter curtain 12 is resumed.

The controller 21 also terminates the falling of the shutter curtain 12 in response to the electric signal from the above-described limit mechanism indicating when the shutter curtain 12 has reached the lowest position, and the laser beam injection machine 34 is turned off. It is programmed to deactivate and terminate monitoring of the output of the optical sensor 40.

The obstacle detection device described above is more conventional than a mechanical obstacle detection device using a movable probe member attached to the lower edge of the shutter curtain and a mechanical link mechanism for transmitting the displacement of the movable probe member generated by the obstacle to an electric switch. It has higher sensitivity and higher reliability. The sensitivity of the above-described obstacle detecting device can be improved by reducing the thickness of the lower wall of the tubular portion 28 of the edge member 24 made of an elastomer to facilitate deformation of the lower wall. When this obstacle detection device is used for a fire shutter, it is important that the edge member 24 is not damaged by fire, because such damage may cause the flame to escape from one side of the shutter curtain to the other. to be. The shape of the edge member 24 is very advantageous because it has a pair of wing portions 32 that donate to cover and protect the tubular portion 28, because the lower wall of the tubular portion 28 is somewhat to some extent. Even if it is thin and fine, the wing | blade part 32 prevents flame escape in case of a fire, and the lower wall of the tubular part 28 is free from the risk of damage. More specifically, since the edge member 24 is formed of a flame retardant elastomer that is fixed to the bottom edge of the shutter curtain 12 without burning when the edge member 24 is exposed to a high temperature in a fire, the wing 32 is closed. Stuck between the bottom edge of the (dropped) shutter curtain 12 and the floor surface to seal any gaps between the bottom edge of the shutter curtain 12 and the floor surface, thereby eliminating any flame from one side of the fire shutter to the other. No exit is allowed.

5 shows an edge member 54, a pair of wing members 55, and an edge member 54 and a wing member 55, which can be used in place of the edge member 24 and the bottom slat 22 described above. ) Shows a cross-sectional view of the bottom slat 52 of the shutter curtain to which is attached. 5 shows the shutter curtain fully lowered to the lowest position. The slat 52 is the same as the slat 22 described above except for the shape of the bottom edge which is suitable for attachment of the edge member 54 and the pair of wing-like members 55. The edge member 54 and the pair of wing members 55, like the edge member 24 described above, are flexible members made of flame retardant elastomer, and extend along almost the entire length of the bottom edge of the shutter curtain. In addition, the flame retardant elastomer forming the edge member 54 and the pair of wing members 55 does not burn when exposed to high temperatures in a fire, similar to the flame retardant elastomer forming the edge member 24. It is an elastomer that is fixed to the bottom edge of the shutter curtain 12. Suitable flame retardant elastomers include, but are not limited to, chloroprene rubber and silicone rubber as described above.

The edge member 54 is formed of a predetermined length extruded elastomeric profile material having a constant cross-sectional shape. Each wing member 55 is also formed of a predetermined length extruded elastomeric profile material having a constant cross-sectional shape.

The edge member 54 has a substantially U-shaped cross-sectional shape and defines a hollow space 56 extending along its longitudinal direction. The edge member 54 also has at its upper end a pair of opposing engagements 58 for engaging and securing the bottom edge of the shutter curtain. The hollow space 56 partitioned on the edge member 54 provides the same function as the hollow space 30 partitioned on the edge member 24 described above.

The pair of wing members 55 are arranged on both sides of the edge member 54 and extend in parallel with the edge member 54. Each vane member 55 has an engaging portion 60 at its upper end for engaging and securing the lower edge of the shutter curtain. In addition, the blade-shaped member 55 covers and protects the edge member 54 when the shutter curtain is completely lowered to the lowest position. With this configuration, when the shutter curtain is dropped during the fire, the wing member 55 functions to prevent the edge member 54 from being damaged by the heat of the fire, so that the wall of the edge member 54 is shown in FIG. Like the lower wall of the tubular portion 28 shown in 2A and 2B, it can have a very thin thickness that contributes to the improvement of the sensitivity of the obstacle detecting device.

Instead of the slat 22 and the edge member 24 shown in FIG. 2, by using the slat 52, the edge member 54 and the pair of wing members 55 shown in FIG. 5, The obstacle detecting device can provide the same function. The main difference between the obstacle detection device using the components shown in FIG. 5 and the obstacle detection device using the components shown in FIG. 2 lies in the manufacturing effort and cost of the obstacle detection device. Which is more preferable depends on the specific use and design of the obstacle detecting apparatus.

Claims (10)

An obstacle detecting device for use in an electric shutter having a metal shutter curtain and an electric lifting mechanism for elevating the shutter curtain, The obstacle detecting device has a flexible edge member attached to the bottom edge of the shutter curtain and extending along almost the entire length of the bottom edge of the shutter curtain, The edge member defines a hollow space extending therein in its longitudinal direction, The obstacle detecting device is provided near one end of the edge member and includes light beam projection means for projecting a light beam in the longitudinal direction of the edge member through the hollow space of the edge member, The obstacle detecting device has an optical sensor positioned near the other end of the edge member and receiving a light beam from the light beam projection means through the hollow space of the edge member, When the edge member is deformed and crushed by an external force, the light beam projected from the light beam projection means is blocked by the crushed edge member, thereby preventing the incident to the optical sensor, The edge member is formed of a flame retardant elastomer that is fixed to the bottom edge of the shutter curtain without burning when exposed to high temperature in a fire, The edge member is provided with a base portion which is held in contact with the bottom edge of the shutter curtain, a tubular portion formed below the base portion to define the hollow space, and a pair formed on both sides of the tubular portion. It has a wing shape of The pair of wing portions protrude downward from the base portion to reach a height below the lowest portion of the tubular portion, The pair of wing portions cover and protect the tubular portion when the shutter curtain is completely lowered to the lowest position. The edge member is formed to adhere to both the bottom edge of the shutter curtain and the floor surface when the edge member is exposed to high temperature in a fire, thereby sealing a gap between the bottom edge of the shutter curtain and the floor surface. Obstacle detection device to use for electric shutter to say. An obstacle detecting device for use in an electric shutter having a metal shutter curtain and an electric lifting mechanism for elevating the shutter curtain, The obstacle detecting device has a flexible edge member attached to the bottom edge of the shutter curtain and extending along almost the entire length of the bottom edge of the shutter curtain, The edge member defines a hollow space extending therein in its longitudinal direction, The obstacle detecting device is provided near one end of the edge member and includes light beam projection means for projecting a light beam in the longitudinal direction of the edge member through the hollow space of the edge member, The obstacle detecting device has an optical sensor positioned near the other end of the edge member and receiving a light beam from the light beam projection means through the hollow space of the edge member, When the edge member is deformed and crushed by an external force, the light beam projected from the light beam projection means is blocked by the crushed edge member, thereby preventing the incident to the optical sensor, The edge member is formed of a flame retardant elastomer that is fixed to the bottom edge of the shutter curtain without burning when exposed to high temperature in a fire, The edge member has a substantially U-shaped cross-sectional shape, and has a pair of opposing engagement portions at its upper end for engaging and securing the lower edge of the shutter curtain, The obstacle detecting device further includes a pair of wing-shaped members positioned on both sides of the edge member and extending in parallel with the edge member, Each of the wing-shaped members has an engaging portion for engaging and securing the lower edge of the shutter curtain to an upper end portion; The pair of wing members is formed of a flame retardant elastomer that is fixed to the bottom edge of the shutter curtain without burning when exposed to high temperature in a fire, The pair of wing members cover and protect the edge member when the shutter curtain is completely lowered to the lowest position. The edge member is formed to adhere to both the bottom edge of the shutter curtain and the floor surface when the edge member is exposed to high temperature in a fire, thereby sealing a gap between the bottom edge of the shutter curtain and the floor surface. Obstacle detection device to use for electric shutter to say. The obstacle detection device according to claim 1 or 2, wherein the flame retardant elastomer is made of chloroprene rubber. The obstacle detecting device for use in an electric shutter according to claim 1 or 2, wherein the flame retardant elastomer material is made of silicone rubber. In the electric shutter provided with a metal shutter curtain, the electric lifting mechanism which raises and lowers the said shutter curtain, the controller which controls the operation of the electric lifting mechanism, and the obstacle detection apparatus equipped in the lower edge of the said shutter curtain, The obstacle detecting device has a flexible edge member attached to the bottom edge of the shutter curtain and extending along almost the entire length of the bottom edge of the shutter curtain, The edge member defines a hollow space extending therein in its longitudinal direction, The obstacle detecting device is provided near one end of the edge member and includes light beam projection means for projecting a light beam in the longitudinal direction of the edge member through the hollow space of the edge member, The obstacle detecting device has an optical sensor positioned near the other end of the edge member and receiving a light beam from the light beam projection means through the hollow space of the edge member, When the edge member is deformed and crushed by an external force, the light beam projected from the light beam projection means is blocked by the crushed edge member, thereby preventing the incident to the optical sensor, The edge member is formed of a flame retardant elastomer that is fixed to the bottom edge of the shutter curtain without burning when exposed to high temperature in a fire, The controller may be configured to: i) stop the falling of the shutter curtain or move the shutter curtain downward from the upward direction when the light beam projected by the optical sensor while the falling of the shutter curtain is incident is blocked. Control the motorized elevating mechanism to invert, and ii) thereafter control the motorized elevating mechanism such that when the light beam enters the light sensor again, the controller starts the descent of the shutter curtain, The edge member is provided with a base portion which is held in contact with the bottom edge of the shutter curtain, a tubular portion formed below the base portion to define the hollow space, and a pair formed on both sides of the tubular portion. It has a wing shape of The pair of wing portions protrude downward from the base portion to reach a height below the lowest portion of the tubular portion, The pair of wing portions cover and protect the tubular portion when the shutter curtain is completely lowered to the lowest position. The edge member is formed to adhere to both the bottom edge of the shutter curtain and the floor surface when the edge member is exposed to high temperature in a fire, thereby sealing a gap between the bottom edge of the shutter curtain and the floor surface. Electric shutter. In the electric shutter provided with a metal shutter curtain, the electric lifting mechanism which raises and lowers the said shutter curtain, the controller which controls the operation of the electric lifting mechanism, and the obstacle detection apparatus equipped in the lower edge of the said shutter curtain, The obstacle detecting device has a flexible edge member attached to the bottom edge of the shutter curtain and extending along almost the entire length of the bottom edge of the shutter curtain, The edge member defines a hollow space extending therein in its longitudinal direction, The obstacle detecting device is provided near one end of the edge member and includes light beam projection means for projecting a light beam in the longitudinal direction of the edge member through the hollow space of the edge member, The obstacle detecting device has an optical sensor positioned near the other end of the edge member and receiving a light beam from the light beam projection means through the hollow space of the edge member, When the edge member is deformed and crushed by an external force, the light beam projected from the light beam projection means is blocked by the crushed edge member, thereby preventing the incident to the optical sensor, The edge member is formed of a flame retardant elastomer that is fixed to the bottom edge of the shutter curtain without burning when exposed to high temperature in a fire, The controller may be configured to: i) stop the falling of the shutter curtain or move the shutter curtain downward from the upward direction when the light beam projected by the optical sensor while the falling of the shutter curtain is incident is blocked. Control the motorized elevating mechanism to invert, and ii) thereafter control the motorized elevating mechanism such that when the light beam enters the light sensor again, the controller starts the descent of the shutter curtain, The edge member has a substantially U-shaped cross-sectional shape, and has a pair of opposing engagement portions at its upper end for engaging and securing the lower edge of the shutter curtain, The obstacle detecting device further includes a pair of wing-shaped members positioned on both sides of the edge member and extending in parallel with the edge member, Each of the wing-shaped members has an engaging portion for engaging and securing the lower edge of the shutter curtain to an upper end portion; The pair of wing members is formed of a flame retardant elastomer that is fixed to the bottom edge of the shutter curtain without burning when exposed to high temperature in a fire, The pair of wing members cover and protect the edge member when the shutter curtain is completely lowered to the lowest position. The edge member is formed to adhere to both the bottom edge of the shutter curtain and the floor surface when the edge member is exposed to high temperature in a fire, thereby sealing a gap between the bottom edge of the shutter curtain and the floor surface. Electric shutter. 7. The electric shutter of claim 5 or 6, wherein the flame retardant elastomer is made of chloroprene rubber. 7. The electric shutter of claim 5 or 6, wherein the flame retardant elastomeric material is made of silicone rubber. delete delete

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