WO2007142080A1

WO2007142080A1 - Obstacle detector of electric shutter and electric shutter equipped with obstacle detector

Info

Publication number: WO2007142080A1
Application number: PCT/JP2007/060902
Authority: WO
Inventors: Ichiro Takahashi; Hiromichi Yamada; Manfred Seysen
Original assignee: Fujita Corporation; Efaflex Japan K.K.
Priority date: 2006-06-07
Filing date: 2007-05-29
Publication date: 2007-12-13
Also published as: JPWO2007142080A1; KR20090023572A; CN101443525A; KR101312338B1; CN101443525B; JP5329953B2

Abstract

[PROBLEMS] To provide an obstacle detector of an electric shutter exhibiting high sensitivity and high operation reliability and not permitting blow-through of flame from one side to the other side of the shutter upon occurrence of a fire, and to provide an electric shutter equipped with such an obstacle detector. [MEANS FOR SOLVING PROBLEMS] The obstacle detector comprises a flexible edge member (24) fixed to the bottom edge of a shutter curtain (12) and extending substantially over the entire length thereof. In the vicinity of one end of the edge member, a laser beam projector (34) projecting a laser beam in the longitudinal direction of the edge member through a hollow space (30) defined by the edge member is arranged, and a photosensor (40) for receiving that laser beam is arranged in the vicinity of the other end of the edge member. When the edge member is deformed elastically by external force and crushed, the laser beam is intercepted by the edge member and prevented from entering the photosensor. The edge member is made of a flame retardant elastomer material.

Description

Specification

Electric shutter obstacle detection device and electric shutter equipped with obstacle detection device

Technical field

The present invention relates to an obstacle detection device used for an electric shutter including a metal shutter curtain and an electric lifting mechanism that lifts and lowers the shutter curtain. The present invention further relates to an electric shutter provided with a powerful obstacle detection device.

Background art

[0002] As a shutter including a metal shutter curtain and an electric lifting mechanism for moving the shutter curtain up and down, for example, there is an electric lifting shutter. Electric lift shutters are widely used as fire shutters in addition to being used as shirts for closing entrances to buildings and facility gates. Many fire shutters in recent years consist of electric shutters combined with fire sensors and automatic actuators. If a fire sensor detects high temperature and Z or smoke in the event of a fire, the electric shutters Is automatically activated so that the shutter curtain descends.

[0003] Generally, when an electric shutter is used, the lower edge of the falling shutter curtain comes into contact with an obstacle in preparation for a person being caught between the falling shutter curtain and the floor. Sometimes it is desirable to equip the bottom edge of the shutter force with an obstacle detection device so that the descent operation can be stopped. In addition, such an obstacle detection device is particularly necessary for an automatically operated fire shutter. Documents disclosing such an obstacle detection device used for an electric shutter include, for example, Japanese Patent Laid-Open Nos. 10-238261 and 2000-54765.

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

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

Disclosure of the invention

Problems to be solved by the invention [0005] For safety fire-operated shutters, it is necessary to keep the shutter curtain up and down at a certain speed or less for safety reasons. However, the ascending / descending speed of the conventional fire shutter is slower than necessary, and its ascending / descending operation is too slow. However, in order to increase the ascending / descending speed of the fire shutter while ensuring safety, an obstacle detection device with higher sensitivity and higher operation reliability is required. On the other hand, obstacle detection devices for fire shutters should not burn out in the event of a fire and allow flames to blow through. Satisfying these requirements together has never been easier.

[0006] The present invention has been made in view of the circumstances in which power is applied. The object of the present invention is to provide a high-sensitivity, high-reliability operating force that is applied to a fire-proof shutter. One side force of the shutter is to provide an obstacle detection device used for an electric shutter without allowing a flame to blow to the other side.

[0007] A further object of the present invention is to provide an electric shutter provided with such an obstacle detection device.

Means for solving the problem

In order to achieve the above object, an obstacle detection device for a shutter according to the present invention is an obstacle used for an electric shutter including a metal shutter curtain and an electric lifting mechanism for moving the shutter curtain up and down. It is a detection device, and is provided with a flexible edge member attached to the lower edge of the shutter curtain and extending over substantially the entire length of the lower edge of the shutter curtain. The edge member defines a hollow space extending in the longitudinal direction of the edge member. The obstacle detection apparatus further includes a light beam projecting unit disposed in the vicinity of 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 optical beam projecting means force is also provided in the vicinity of the other end of the edge member, and the optical beam projection means force receives a light beam through the hollow space of the edge member. Further, when the edge member is in a deformed state due to elastic deformation due to an external force, the light beam force of the light beam projecting means is blocked by the edge member in a collapsed state and is incident on the optical sensor. It is designed to prevent you from doing. The edge member is made of a flame retardant elastomer material that adheres to the lower edge of the shutter curtain without igniting when exposed to a high temperature during a fire. It is made more.

[0009] In addition, an electric shutter equipped with the obstacle detection device according to the present invention controls a metal shirt curtain, an electric lifting mechanism for moving the shutter curtain up and down, and an operation of the electric lifting mechanism. And an obstacle detection device provided at a lower edge of the shutter curtain. The obstacle detection device includes a flexible edge member that is attached to a lower edge of the shutter force and extends substantially over the entire length of the lower edge of the shutter curtain. The edge member defines a hollow space extending in the longitudinal direction of the edge member. The obstacle detection device further includes a light beam projecting unit that is disposed in the vicinity of one end of the edge member and projects a light beam in the longitudinal direction of the edge member through the hollow space of the edge member. And an optical sensor disposed in the vicinity of the other end of the edge member for receiving the light beam projection means force light beam through the hollow space of the edge member. Further, when the edge member is elastically deformed and crushed by an external force, the light beam of the light beam projection means is blocked by the crushed edge member, and the light sensor It is designed to be prevented from entering. The edge member is made of a flame retardant elastomer material that adheres to the lower edge of the shutter curtain without igniting when exposed to high temperatures during a fire. Further, the control device is configured to apply a force for stopping the lowering operation of the shirt curtain or the shutter curtain if the light beam is incident on the optical sensor during the lowering operation of the shutter curtain and the light beam is interrupted. The shutter curtain is lowered and resumed when the light beam is incident on the optical sensor again after being raised and blocked.

The invention's effect

[0010] According to the present invention, the obstacle detection device for the electric shutter detects the elastic deformation of the edge member attached to the lower edge of the shutter curtain by blocking the light beam. Very high sensitivity and high operational reliability. The edge member also has a high degree of flame retardancy, and it adheres to the lower edge of the shutter curtain without igniting when exposed to high temperatures during a fire. It sticks tightly to the floor and keeps that part sealed, so that the shirt can It does not allow a flame to blow from one side of one to the other.

Brief Description of Drawings

[0011] FIG. 1 is a diagram showing a preferred embodiment of the present invention, in which A is a front view of an electric lifting shutter equipped with an obstacle detection device, B is a side view thereof, and C is a CC thereof. It is a cross-sectional plan view along the line.

[Fig. 2] A is a cross-sectional view of the lower edge of the shutter curtain shown in FIG. 1 and the edge member attached thereto, and B is the same diagram as A, but the shutter curtain is completely (lower limit) It is the figure which showed the state when it was taken down to the position.

FIG. 3 is an enlarged partial front view showing a portion of one end of a lower edge of the shutter curtain shown in FIG.

4 is an enlarged partial front view showing the other end portion of the lower end edge of the shutter curtain shown in FIG. 1. FIG.

FIG. 5 is a cross-sectional view showing the lower end edge of the shutter curtain according to the modified example and the edge member according to the modified example attached thereto, when the shutter curtain is completely lowered (to the lower limit position). It is the figure which showed the state.

Explanation of symbols

[0012] 10 …… Electric hoisting shutter

12 …… Shutter curtain

14 Shutter box

21 …… Control device

22 …… Slat

24 …… Edge member

28 …… Tubular section of edge member

30 …… hollow space

32 …… Wings of edge member

34 …… Laser beam ejector (light beam projection means)

40 …… Optical sensor

52 …… Slat 54 …… Edge member

55 …… Wings

56 …… Hollow space

BEST MODE FOR CARRYING OUT THE INVENTION

[0013] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a diagram showing a preferred embodiment of the present invention. A is a front view of an electric lifting shutter 10 equipped with an obstacle detection device, B is a side view thereof, and C is a CC line thereof. FIG. As shown in FIGS. 1A to 1C, the electric lifting shutter 10 includes a shutter curtain 12, a shutter box 14 fixedly attached to the building, and a pair of vertical extensions fixedly attached to the building. It is provided with a supporting column 16 to be used. The pair of struts 16 are made of hollow steel pillars, and a pair of vertically extending guide rails 18 are accommodated in the struts 16.

[0014] The electric hoisting shutter 10 is further provided with an electric elevating mechanism (leaking mechanism) 20 that raises and lowers the shutter curtain 12 by removing and rewinding the shutter curtain 12. The mechanism 20 is accommodated in the shutter box 14. The electric hoisting shutter 10 is further provided with a control device 21 for controlling the operation of the electric lifting mechanism 20, and the control device 21 includes a microcomputer for controlling the power supplied to the electric lifting mechanism 20. An electronic circuit 21a composed of a power control element, an operation terminal 21b for an operator to input commands to the electronic circuit 21a, and a fire sensor 21c composed of a temperature sensor and a Z or smoke detection sensor (The electronic circuit 21a, the operation terminal 21b, and the fire sensor 21c are schematically shown in the figure).

[0015] The shutter curtain 12 is configured by vertically connecting a plurality of metal slats 22 extending in the horizontal direction, like the shutter curtains of many conventional lifting shutters. However, while many conventional shutter shutters use a steel plate slat, the slat 22 of the shutter curtain 12 shown in the figure has a constant cross-sectional shape produced by extrusion. Profil material strength made of aluminum alloy. However, this is not an indispensable requirement for carrying out the present invention. The present invention is based on an electric saddle equipped with a shutter curtain using steel plate slats. The present invention can also be applied to a flip shutter, and can also be applied to other types of electric shutters other than a lifting shutter.

[0016] A flexible edge member 24 made of a flame-retardant elastomer material, which is a constituent element of the obstacle detection device according to the present invention, is attached to the lower edge of the shutter curtain 12. The edge member 24 extends over substantially the entire length of the lower end edge of the shutter curtain 12. Since both side edges of the shutter curtain 12 are accommodated inside the hollow support column 16, the end edge member 24 does not need to extend to the side ends of the both side edges of the shutter curtain 12 and is at least of the support column 16. It only needs to extend over the range exposed to the outside. The flame retardant elastomer material used to produce the edge member 24 has the property of adhering to the lower edge of the shutter curtain 12 without igniting when exposed to high temperatures during a fire. Suitable flame retardant elastomer materials having various properties include chloroprene rubber and silicone rubber.

FIG. 2A is a cross-sectional view of the lower end edge of the shutter force ten and the end edge member 24 attached thereto, and B is the same view as A, but the shutter curtain 12 is completely ( It is the figure which showed the state when it was lowered (to the lower limit position). FIGS. 3 and 4 are enlarged front views showing one end and the other end of the lower end edge of the shutter curtain 12, and these drawings show a part of the lowermost slat 22 of the shutter curtain 12. It is shown. The edge member 24 attached to the slat 22 is a long profile member having a constant cross-sectional shape manufactured by extrusion molding and has a unique cross-sectional shape as shown in the figure. Yes.

[0018] As shown in FIGS. 2A and 2B, the edge member 24 includes a base portion 25 attached in contact with the lowermost slat 22 of the shutter curtain 12, and an engagement formed on the upper surface of the base portion 25. A pair of edges of the slats 22 are fitted into a pair of grooves formed between the upper surface of the base portion 25 and the lower surface of the locking portion 26. It is attached to slat 22.

The edge member 24 further includes a tubular portion 28 formed below the base portion 25. The tubular portion 28 has a semicylindrical lower wall, has a semicircular cross-sectional shape bulging downward, and a hollow space 30 extending in the longitudinal direction of the edge member 24 is formed therein. Defined [0020] The edge member 24 further includes a pair of wing-like portions 32 formed on both sides of the tubular portion 28. The pair of wings 32 extends obliquely downward and outward from the base 25 and extends further downward from the lowermost part of the tubular portion 28. The wings 32 are formed on the shutter curtain 12. Is formed so as to cover the tubular portion 28 when it is completely lowered (to the lower limit position) (see B in FIG. 2). According to this configuration, if a fire occurs and the shutter force 10 is lowered, the wing-like portion 32 prevents the tubular portion 28 from being damaged by the heat of the fire. In addition, the wall thickness of the tubular portion 28 can be reduced.

[0021] When the shutter curtain 12 reaches the upper limit position when the shutter curtain 12 is raised, the electric lifting shutter 10 stops raising, and when the shutter curtain 12 is lowered. A limit mechanism (not shown) is provided for stopping the descent when the shutter curtain 12 reaches the lower limit position. This limit mechanism is electrically connected to the control device 21 (see B in FIG. 1). If the shutter curtain 12 reaches the upper limit position and the lower limit position, an electric signal indicating that these positions have been reached. Is sent to the control device 21. Since the limit mechanism having such a function is generally equipped in various conventional electric lifting shutters, it is not shown in detail here. Further, in the illustrated electric lifting shutter 10, when the shutter curtain 12 is at its lower limit position, the position of the floor surface relative to the shutter force 10 is shown in FIG. 2B, FIG. 3 and FIG. In other words, a small gap is present between the floor surface FL and the lower surface of the tubular portion 28 of the end edge member 24.

[0022] Generally, when the shutter curtain 12 is completely lowered, the position of the floor surface FL is substantially aligned with the position of the lower surface of the tubular portion 28 of the edge member 24. You can do it. Therefore, as in the illustrated example, when the shutter curtain 12 is in its lower limit position, a small gap is present between the floor surface and the lower surface of the tubular portion 28 of the edge member 24. It is possible to make the lower surface of the tubular portion 28 in contact with the floor surface, which is not an essential requirement for implementation, or to make the gap between them slightly larger. It is important to note that when shutter curtain 12 is fully lowered, The edge is in contact with the floor surface FL and the cover is covered with the tubular portion 28.

However, if the relative position in the illustrated example is adopted, the tubular portion 28 of the edge member 24 does not contact the floor surface FL, so that the shutter curtain 12 is completely lowered over a long period or a long period of time. Even if this continues, there is an advantage that creep does not occur on the semi-cylindrical lower wall of the tubular portion 28.

[0024] At one end of the lower edge of the shutter curtain 12 shown in FIG. 3, a laser beam emitter 34, which is a light beam projection means, is disposed in the vicinity of one end of the edge member 24. The laser beam generator 34 is attached to the lowermost slat 22 of the shutter curtain 12 via a bracket 36. The laser beam ejector 34 is a small device using a laser diode, and is arranged so as to project a laser beam 38 in the longitudinal direction of the edge member 24 through the hollow space 30 of the edge member 24. The

At the other end of the lower end edge of the shutter curtain 12 shown in FIG. 4, a photosensor 40 is disposed in the vicinity of the other end of the end edge member 24. This photosensor 40 is a bracket 42. It is attached to the lowermost slat 22 of the shutter curtain 12 via. The optical sensor 40 is arranged to receive the laser beam 38 from the laser beam emitter 34 through the hollow space 30 of the edge member 24.

[0026] If an obstacle such as a human body is sandwiched between the lower edge of the shutter curtain 12 and the floor surface FL while the electric hoisting shutter 10 is being lowered, Due to the external force applied from the obstacle, the lower wall of the tubular portion 28 of the edge member 24 is elastically deformed, and the tubular portion 28 is crushed at the place where the obstacle comes into contact. When the tubular portion 28 is in a collapsed state, the laser beam 38 projected from the laser beam ejector 34 is blocked by the tubular portion 28 and prevented from entering the optical sensor 40.

The laser beam emitter 34 and the optical sensor 40 are electrically connected to the control device 21 (see B in FIG. 1). At the start of the descent operation of the shutter curtain 12, the control device 21 activates the laser beam ejector 34 to start projecting the laser beam 38 and starts monitoring the output of the optical sensor 40. Then, the control device 21 cuts off the laser beam 38 incident on the optical sensor 40 during the lowering operation of the shutter curtain 12 so that the optical sensor 40 If the light receiving output of 40 disappears, the electric lift mechanism 20 is controlled to stop the lowering operation of the shutter curtain 12, and then the interrupted laser beam 38 enters the optical sensor again. For example, the descent operation of the shutter curtain 12 is resumed.

[0028] Alternatively, if the configuration of the control device 21 is such that the laser beam 38 incident on the optical sensor 40 during the lowering operation of the shutter curtain 12 is interrupted and the received light output of the optical sensor 40 disappears, When the shutter curtain 12 is lifted by controlling the electric lifting mechanism 20 and then shut off, and the laser beam 38 enters the optical sensor again, the lowering operation of the shirt curtain 12 is resumed. It is good also as such a structure.

[0029] Further, when the shutter curtain 12 is lowered to the lower limit position, the control device 21 also receives a signal indicating that the limit mechanism force described above, and in response to the signal, performs a lowering operation of the shutter force ten. At the same time, the laser beam emitter 34 is deactivated, and monitoring of the output of the optical sensor 40 is terminated.

[0030] The obstacle detection device described above is a system in which the displacement generated when the movable member attached to the lower edge of the shutter curtain comes into contact with the obstacle is transmitted to the electric switch by a mechanical link mechanism. Compared to conventional obstacle detection devices, it is very sensitive and has high operational reliability. This obstacle detection device detects a thin wall by thinning the lower wall of the tubular portion 28 of the edge member 24 made of an elastomer material so that the elastic deformation of the lower wall occurs more easily. Sensitivity can be further improved. When this obstacle detection device is applied to a fire shutter, the edge member 24 should not burn out in the event of a fire, and the flame from one side of the shutter to the other must not blow through. Since the edge member 24 has a pair of wings 32 covering and covering the tubular part 28, no matter how thin the lower wall of the tubular part 28 is, the wings 32 can prevent such a flame. Blowing is prevented. That is, the material of the edge member 24 is fixed to the lower edge of the shutter curtain without igniting when exposed to a high temperature at the time of a fire. It sticks between the floor and the floor and keeps that part sealed, preventing the blowout of flame from one side of the shutter to the other. FIG. 5 is a cross-sectional view showing an edge member 54, a pair of wing-like members 55 according to the modified example, and a lower end edge of the slat 52 at the lowest stage of the shutter curtain according to the modified example to which they are attached. It shows the state when the shutter curtain is completely lowered (to the lower limit position). The slat 52 is configured in the same manner as the slat 22 described above, except that the cross-sectional shape of the lower end edge thereof is a shape suitable for attaching the end edge member 54 and the pair of wing members 55. . The edge member 54 and the pair of wing members 55 are flexible members made of a flame-retardant elastomer material, like the edge member 24 described above. The bottom edge extends substantially over the entire length. In addition, the flame-retardant elastomer material that is the material for producing the edge member 54 and the pair of wing-like members 55 is similar to the flame-retardant elastomer material that is the material for producing the edge member 24 in the event of a fire. When exposed to high temperatures, it has the property of adhering to the lower edge of the shutter curtain without igniting, and as described above, a suitable flame retardant elastomer material having such properties is chloroprene. There are rubber and silicone rubber.

[0032] The edge member 54 is a long member made of a profile material force having a constant cross-sectional shape manufactured by extrusion molding. The pair of wing members 55 is also a long member having a profile material force having a constant cross-sectional shape manufactured by extrusion molding.

[0033] The end edge member 54 has a U-shaped cross section, and a hollow space 56 extending in the longitudinal direction of the end edge member 54 is defined therein. The edge member 54 has, at its upper end, a pair of locking portions 58 that are locked and attached to the lower edge of the shirt curtain. The hollow space 56 defined by the end edge member 54 performs the same function as the hollow space 30 defined by the end edge member 24 described above.

The pair of wing members 55 are disposed on both sides of the edge member 54 and extend in parallel with the edge member 54. Each of the pair of wing-like members 55 has an engaging portion 60 attached to the upper end edge of the pair of wing-like members 55 while being engaged with the lower end edge of the shutter curtain. Further, the pair of wing-like members 55 are formed so as to cover and cover the edge member 54 when the shutter curtain is completely lowered (to the lower limit position). According to this configuration, if a fire occurs and the shutter curtain is completely lowered, the wing member 55 prevents the edge member 54 from being damaged by the heat of the fire. And the configuration shown in B In the same way that the wall thickness of the tubular portion 28 can be reduced, the wall thickness of the end edge member 54 can be reduced, whereby the detection sensitivity can be further improved.

Even when the slat 52, the edge member 54, and the pair of wing members 55 shown in FIG. 5 are used instead of the slat 22 and the edge member 24 shown in FIGS. There is no particular change in the function and effect. The main difference between the two is the production effort and the cost in terms of cost. In these respects, either the configuration shown in Figs. 2A and 2B or the configuration shown in Fig. 5 can be superior. This depends on the individual application and design.

Claims

The scope of the claims

[1] In an obstacle detection device used for an electric shutter including a metal shutter curtain and an electric lifting mechanism for moving the shutter curtain up and down,

A flexible edge member attached to the lower edge of the shutter curtain and extending over substantially the entire length of the lower edge of the shutter curtain;

The edge member defines a hollow space extending in a longitudinal direction of the edge member, and passes through the hollow space of the edge member disposed in the vicinity of one end of the edge member. Light beam projecting means for projecting a light beam in the longitudinal direction of the edge member, and the light beam passes through the hollow space of the edge member and is disposed near the other end of the edge member. Projection means force A light sensor for receiving the light beam is provided.

When the edge member is in a deformed state due to elastic deformation due to an external force, the light beam of the light beam projection means is blocked by the edge member in the collapsed state and is incident on the optical sensor. To prevent

The edge member is made of a flame retardant elastomer material that adheres to the lower edge of the shutter curtain without igniting when exposed to a high temperature during a fire. Obstacle detection device.

[2] The obstacle detection device for an electric shutter according to claim 1, wherein the flame retardant elastomer material is made of chloroprene rubber.

3. The obstacle detection device for an electric shutter according to claim 1, wherein the flame retardant elastomer material is made of silicone rubber.

[4] The edge member includes a base portion that is attached to contact with a lower end edge of the shutter curtain, a tubular portion that is formed below the base portion and defines the hollow space, and both sides of the tubular portion. A pair of wings formed,

The pair of wings extend to the lower side of the tubular part by extending the base force diagonally downward and outward, and extending further downward from the lowermost part of the tubular part,

The pair of wing-shaped portions are formed so as to cover and cover the tubular portion when the shutter curtain is completely lowered.

The obstacle detection of the electric shutter according to any one of claims 1 to 3, Intelligent device.

[5] The end edge member has a cross-sectional shape, and has a pair of locking portions attached to the upper end edge of the end edge member to be engaged with the lower end edge of the shutter force.

The obstacle detection device further includes a pair of wing-shaped members disposed on both sides of the edge member and extending in parallel with the edge member.

Each of the pair of wing-shaped members has a locking portion that is locked to and attached to the lower end edge of the shutter curtain at the upper end edge thereof,

The pair of wing members are made of a flame retardant elastomer material that adheres to the lower edge of the shutter curtain without igniting when exposed to a high temperature during a fire. Formed so as to cover and cover the edge member when the shutter curtain is completely lowered;

The obstacle detection device for an electric shutter according to any one of claims 1 to 3.

[6] With a metal shutter curtain,

An electric lifting mechanism for lifting and lowering the shutter curtain;

A control device for controlling the operation of the electric lifting mechanism;

An obstacle detection device equipped at a lower edge of the shutter curtain, the obstacle detection device,

A flexible edge member attached to the lower edge of the shutter curtain and extending substantially over the entire length of the lower edge of the shutter curtain;

The edge member defines a hollow space extending in a longitudinal direction of the edge member, and passes through the hollow space of the edge member disposed in the vicinity of one end of the edge member. And a light beam projecting means for projecting a light beam in the longitudinal direction of the edge member, and passing through the hollow space of the edge member disposed in the vicinity of the other end of the edge member. An optical sensor for receiving a light beam from the light beam projection means;

When the edge member is in a state where it is elastically deformed and crushed by an external force, the light beam of the light beam projection means is blocked by the edge member in the crushed state, and the light To prevent it from entering the sensor,

The edge member is made of a flame retardant elastomer material that adheres to the lower edge of the shirt curtain without igniting when exposed to a high temperature during a fire, and the control device includes the shutter force If the light beam is incident on the light sensor during the tenth descent operation and the light beam is interrupted, the force to stop the descent operation of the shutter curtain or the shutter curtain is raised and interrupted !, The descent operation of the shutter curtain is resumed when the light beam again enters the optical sensor.

An electric shutter equipped with an obstacle detection device.

7. The electric shutter equipped with an obstacle detection device according to claim 6, wherein the flame retardant elastomer material also has a chloroprene rubber force.

8. The electric shutter equipped with the obstacle detection device according to claim 6, wherein the flame retardant elastomer material is made of silicone rubber.

[9] The end edge member includes a base portion that is attached in contact with a lower end edge of the shutter curtain, a tubular portion that is formed below the base portion and defines the hollow space, and both sides of the tubular portion. A pair of wings formed,

An electric shutter provided with the obstacle detection device according to any one of claims 6 to 8.

[10] The edge member has a cross-sectional shape of a force, and has a pair of locking portions attached to the upper edge of the edge member to be locked to the lower edge of the shutter force.

Each of the pair of wing-shaped members has a locking portion that is locked to and attached to the lower end edge of the shutter curtain at the upper end edge thereof, The pair of wing members are made of a flame retardant elastomer material that adheres to the lower edge of the shutter curtain without igniting when exposed to a high temperature during a fire. Formed so as to cover and cover the edge member when the shutter curtain is completely lowered;