JPH09165983A - Obstacle detector for shutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device which is simple in structure and low cost to manufacture and operate definitely even when it is used for a long period of time. SOLUTION: A sensor lever 17 consisting of a material, such as aluminum, which is strong in torsional rigidity, is laid out in the longitudinal direction of a seat board comprising a seal board main body 011 and a sensor board. When the sensor board is in contact with an obstacle and pushed up, the sensor lever 17 is forced to move. Since the sensor lever 17 is strong in torsional rigidity, even if contact with an obstacle occurs at any site no matter where it may be, the detection can be definitely transmitted to a microswitch so that a shutter may come to a halt simultaneously. Preferably, one microswitch should be loaded in the seat board. Furthermore, since there is no need to divide the sensor board, its outward appearance will be kept undamaged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an obstacle detecting device for a shutter, which detects contact of a shutter provided at the tip of a shutter with the obstacle when the seat plate contacts the obstacle.

[0002]

2. Description of the Related Art Generally, shutters are provided at entrances of warehouses, stores, and the like for security purposes. There are generally two types of shutters: a vertical shutter that operates in the up-and-down direction to open and close, and a horizontal shutter that operates in the left-and-right direction to open and close. In either type, the shutter is for closing a desired opening. The shutter includes a curtain, guide rails for guiding both sides of the shutter curtain, a winding shaft for winding the shutter curtain, and an opening / closing device having an electric motor for rotating the winding shaft. Further, since the front end of the shutter curtain comes into contact with the contact surface (the floor surface in the case of the vertical type and the side wall surface in the case of the horizontal type) when closing, the seat plate is attached.

[0003] In addition, since the shutter normally opens and closes by reversibly driving an electric motor, if there is an obstacle at the shutter closing position, the seat plate collides with the obstacle and the shutter closes. You will not be able to do it. Further, if the vehicle collides with a human such as a pedestrian instead of an obstacle, an unexpected injury may occur, which is dangerous. Therefore, conventionally, in order to solve such a problem, an obstacle detection device for a shutter has been used, and when the seat plate of the shutter collides with a foreign object, the rotation of the electric motor is immediately stopped to ensure safety. It secures sex.

FIG. 5 is an explanatory view schematically showing the structure of a conventional vertical shutter obstacle detection device. FIG. 5 (a) is a front view of the inside of the seat plate 101, and FIG. 5 (b) is a seat. Board 1
A cross-sectional view of the inside of 01 and the same figures (c) to (e) schematically show explanatory views each showing an operation when a force is applied from the direction of the arrow. As shown in FIG.
The seat plate 101 is composed of a seat plate main body 102 having a substantially U-shaped cross section and a sensing plate 103 which is loosely fitted and fixed to the seat plate main body 102 and has a laterally elongated structure as a whole. ing. That is, the length of the seat plate 101 is the width of the shutter.

The lower end portion of the seat plate body 102 is bent inward at a right angle to a minute length, and the bent portion serves as a locking piece 104 with the sensing plate 103. Further, a stopper 105 for determining the rising limit of the sensing plate 103 is provided at a position slightly above the locking piece. The outer surface of the sensing plate 103 has a U-shaped cross section,
Its width is slightly wider than that of the seat plate body 102 described above. Therefore, as shown in FIG. 5B, the sensing plate 103 is arranged so as to include the lower end portion of the seat plate body 102. Further, two locking projections 106 are formed on the inner surface side of the sensing plate 103, and the sensing projections 103 are formed by engaging the locking projections 106 of the seat plate body 102 with the tips of the locking projections 106. The weight of the whole body is supported. The sensing plate 103 is divided into four parts in the lateral direction as shown in FIG. 7A, and the microswitches 107 are arranged at the end portions of each of the four divided sensing plates 103. .

As shown in FIG. 1B, the micro switch 107 is constructed by a base plate 108 and a seat plate main body 1.
It is fixed to No. 02 using a bolt, a nut, etc., and a detection protrusion 107a for switching contacts is attached to the lower end portion. Then, when the sensing plate 103 is pushed upward and comes into contact with the detection protrusion 107a, the micro switch 107 is switched. That is, as shown in FIG.
As shown in (d) and (e), when the seat plate 101 located at the lower end of the shutter curtain comes into contact with an obstacle when the shutter is closed, a force is applied in the direction of the arrow shown in each drawing. This contact pushes the sensing plate 103 upward, whereby the detection protrusion 107a of the micro switch 107 is moved and the micro switch 107 is switched, and it is possible to detect that the seat plate 101 has come into contact with an obstacle. Therefore, by connecting the output terminal of the microswitch 107 to the electric motor for winding the shutter curtain and linking them, it is possible to immediately stop the closing of the shutter curtain when the contact with the obstacle is detected.

Further, as shown in FIG. 5A, the sensing plate 1
The reason why 03 is divided into multiple (4 in this case) is
For example, in the case where the sensing plate 103 that is integrally formed in the lateral direction without being divided is used, even if the sensing plate 103 comes into contact with an obstacle and the sensing plate 103 is pushed up at this contact portion, the sensing plate 103 is pushed up. The deflection of 103 does not always push up the sensing plate 103 at the position where the microswitch 107 is arranged. That is, suppose that one micro switch 107 is attached to each end of the seat plate 101 in the lateral direction, and when an obstacle contacts the sensing plate 103 at the center, the sensing plate 103 bends. It may not be possible to switch the micro switch 107. In addition, if the thickness of the sensing plate 103 is increased to increase the strength in order to prevent the sensing plate 103 from bending, the weight of the sensing plate 103 itself increases, which causes inconvenience such as poor sensitivity. Therefore, when the seat plate is long in the lateral direction, it is necessary to divide the sensing plate 103 into a length that does not cause the deflection.

Therefore, in the conventional obstacle detecting device, a large number (in this case, eight) of obstacles are detected in the seat plate body 102 in order to reliably detect the obstacles at any position. It is necessary to dispose the micro switch 107, which is expensive in cost. Further, since the sensing plate 103 of the seat plate 101 is divided, when the shutter is rolled up and fully opened, the divided sensing plate 103 can be seen from below, which has a drawback of impairing aesthetics. Further, as another conventional example, Japanese Patent Laid-Open No. 10695/1993
No. 5 microfilm and those described in JP-A-5-12595 are known. Although illustration is omitted about these contents, a rotary body and a rotary body receiver are used, and when the seat plate collides with an obstacle, the rotary body rotates to detect the switch by turning on the switch. . However, in the method described in each of the above microfilms, when the friction between the rotating body and the rotating body receiver increases due to aging, the rotating body may not rotate. In this case, even if the obstacle is removed after the switch is turned on and the electric motor is stopped, the switch may not be turned off, which causes a malfunction.

On the other hand, in the case of the horizontal type shutter, as shown in FIG. 6, a seat plate 111 having a tape switch 112 attached to the front end is often used. As shown in the figure, the tape switch 112 is composed of a contact member 116 formed of a flexible material such as rubber and having an arcuate cross section, and arranged inside the contact member 116 and separated by a predetermined distance. And contact points 113a and 113b arranged to face each other. Therefore, when the seat plate 111 comes into contact with the obstacle, the contact member 116 is pressed inward, whereby the contact 1
Since 13a and 113b are in contact with each other, the contact is turned on, whereby the shutter opening / closing device can be stopped. However, such a tape switch is expensive in terms of cost, and since it uses a flexible material such as rubber, it has a drawback that it is consumed due to long-term use.

[0010]

As described above, as shown in FIG.
In the conventional example shown in FIG.
Since 07 is used, the cost is high, and since the sensing plate 103 is divided, the aesthetic appearance is impaired. In addition, the contents described in JP-A-5-10695 and JP-A-5-12595 microfilm have a drawback that malfunction occurs due to aging. Further, the method of using the tape switch shown in FIG. 6 has the drawbacks that the cost is high and that it is consumed after a long period of use. The present invention has been made to solve such a conventional problem, and its object is to be able to be configured easily and inexpensively, and to operate reliably even when used for a long period of time. An object is to provide an obstacle detection device for a shutter.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to a case where a long seat plate arranged along a closed end of a shutter curtain collides with an obstacle. In the shutter obstacle detection device for detecting,
The seat plate is composed of a seat plate body and a sensing plate that is loosely arranged on the contact side of the seat plate body when the seat plate body is closed. The seat plate is arranged along the longitudinal direction in the seat plate and has a high torsional rigidity. And a sensing lever that is movable in contact with the sensing plate when the sensing plate is pressed toward the seating plate main body, and is fixed in the seating plate body to detect the operation of the sensing lever. And a detection switch whose contact is switched.
Further, the present invention is characterized in that an urging means for urging the sensing plate to move away from the seat plate body is interposed between the seat plate body and the sensing plate.

According to the present invention constructed as described above, even if any portion of the seat plate having a long structure comes into contact with an obstacle,
The sensing lever moves at this portion, and since the sensing lever has strong torsional rigidity, the movement of the sensing lever is transmitted to the mounting position of the detection switch. Therefore, the detection switch can reliably detect contact with an obstacle, improving safety, and since the torsional rigidity of the sensing lever hardly deteriorates with time, etc., it may malfunction even after long-term use. Does not cause. In addition, the horizontal shutter (type that slides the shutter curtain to the left and right) does not allow the sensing plate to return due to its own weight, so by providing a biasing means such as a spring between the seat plate body and the sensing plate, contact with obstacles The position of the sensing plate is restored to the original position when is released.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are schematic views showing a schematic configuration of a shutter to which the present invention is applied, FIG. 1 showing a vertical shutter structure, and FIG. 2 showing a horizontal shutter structure. As shown in FIG. 1, the vertical shutter is
Mainly, a shutter curtain 1 for closing an opening surface such as an entrance of a warehouse or an entrance of a store, guide rails 2 arranged on both sides of the shutter curtain 1 for guiding a vertical movement of the shutter curtain 1, and a shutter curtain 1 Of the seating plate 3, which is arranged at the bottom of the table, is in contact with the floor surface 6 and on which an obstacle detection device described later is mounted, the winding shaft 4 for winding up the shutter curtain 1, and the winding shaft 4. It is configured by an opening / closing device 5 that reversibly rotates the shutter curtain 1 to operate in the vertical direction. Reference numeral 7 indicates an obstacle that is carelessly placed between the seat plate 3 and the floor surface 6. On the other hand, as shown in FIG. 2, in the horizontal shutter, the shutter curtain 1 is guided by the lower guide rail 8 and the hanger rail 9 so as to be operated in the left-right direction. Is equipped with a hanger roller 10 for smoothly sliding the shutter curtain 1. Other seat plate 3, winding shaft 4, opening / closing device 5
Is the same as the vertical shutter described above.

FIG. 3 is an explanatory view schematically showing the seat plate 3 on which the obstacle detecting device for a shutter according to the first embodiment of the present invention is mounted. FIG. 3 (a) is a front view and FIG. (B) is a cross-sectional view taken along the line AA of (a) of the same figure, and (c) to (e) of the same figure are operation explanatory views when a force is applied from each arrow direction. As shown in FIG. 1B, the seat plate 3 is mainly composed of a seat plate body 11 having a substantially U-shaped cross section and having a lower opening, and a sensing plate 12 loosely fitted and fixed to the seat plate body 11. It has a long structure as a whole. A lower end portion of the seat plate body 11 is bent inward at a small length in a substantially right angle direction, and the bent portion serves as a locking piece 13 that locks the sensing plate 12. Further, a stopper 14 for determining the rising limit of the sensing plate 12 is provided at a slightly upper side of the locking piece 13.

The sensing plate 12 has an outer surface of a U-shaped cross section, and its width is slightly wider than that of the seat plate body 11 described above. Therefore, as shown in FIG. 3B, the sensing plate 12 is arranged so as to include the lower end portion of the seat plate body 11. Further, two locking projections 15 and 16 are formed on the inner surface side of the sensing plate 12, and the locking projections 15 and 16 are formed.
The locking pieces 15a and 16a are attached to the respective ends of the seats, and by engaging the locking pieces 15a and 16a with the locking pieces 13 of the seat plate body 11, the weight of the sensing plate 12 is supported. Has become. A pressing piece 16b is also attached to the tip of the locking projection 16, and the pressing piece 16b is attached.
The sensing lever 17 described later is pressed by b. The sensing plate 12 has a laterally integrated structure as shown in FIG.

One microswitch 19 as a detection switch is attached to the inner surface of the seat plate body 11 in the longitudinal direction (the left end in the figure) through the base plate 20, and the tip of the microswitch 19 is attached. Is facing down. The microswitch 19 has a detection protrusion 19 at the tip.
When the detection protrusion 19a is pressed, it operates so as to switch the contact signal (that is, it turns on in the case of a contact and turns off in the case of b contact). The detection signal of the micro switch 19 is connected to the switch device 5 shown in FIG. A fixing protrusion 18 is provided on the inner surface of the seat plate body 11 so as to project therefrom.
One end of a sensing lever 17, which is made of a material having a high torsional rigidity such as aluminum and having an obtuse L-shaped cross section, is fixed to 8. The other end of the sensing lever 17 is close to the tip of the detection protrusion 19a of the microswitch 19, and the convex portion 1 is provided at a portion facing the detection protrusion 19a.
7a are formed. A pressing piece 16b is in contact with the sensing lever 17 in the vicinity of the bent portion.
When b moves upward, the convex portion 17a acts so as to rise.

Next, the operation of this embodiment configured as described above will be described. When there is an obstacle 6 (see FIG. 1) below the seat plate of the shutter when closing the shutter, the seat plate 3 is lowered when the shutter curtain 1 descends.
The obstacle 6 will collide with any part in the longitudinal direction. Then, as shown in FIG. 3E, the sensing plate 12 is pushed upward to raise the sensing lever 17, so that the convex portion 17a at the tip of the sensing lever 17 presses the detection protrusion 19a of the microswitch 19. , The micro switch 19 is turned on (or turned off when the contact point is b). As a result, the opening / closing device 5 shown in FIG. 1 is turned off, and the descent of the shutter curtain 1 is stopped. At this time, obstacle 6
No matter where the seat board 3 collides with the seat board 3 in the lateral direction, the sensing lever 17 is made of a material having a high torsional rigidity such as aluminum as described above, so that the micro switch 19 is securely pressed to the installation position. The generated force is transmitted, and the microswitch 19 can be turned on (or turned off in the case of the b contact). Further, as shown in FIGS. 3 (c) and 3 (d), even when a force acts on the seat plate 3 with a bias toward the rear side or the front side, the detection plate 12 or the pressing piece 16b surely causes the detection lever 17 to move. By pressing, the microswitch 19 can be turned on (off in the case of the b contact).

As described above, according to the obstacle detecting device of the present embodiment, it is not necessary to dispose a large number of microswitches 19 or divide the sensing plate 12 into plural pieces as in the conventional case, and at least one piece is required. Since it can be configured by using the micro switch 19 and the sensing plate 12 integrally molded in the lengthwise direction, the configuration can be inexpensive and simple as compared with the conventional one. Further, since the sensing lever 17 is made of a metal having high torsional rigidity, it does not deteriorate due to long-term use, and high reliability can be obtained. Further, even when the seat plate 3 is tilted forward and backward and a force is applied, the contact with the obstacle can be reliably detected.

FIG. 4 is an explanatory view schematically showing the seat plate 3 on which the shutter obstacle detecting device according to the second embodiment of the present invention is mounted. FIG. 4 (a) is a front view and FIG. (B) is a cross-sectional view taken along the line AA of (a) of the same figure, and (c) to (e) of the same figure are operation explanatory views when a force is applied from each arrow direction. This embodiment differs from the first embodiment described above in that it is mounted on a seat plate used for a horizontal shutter (see FIG. 2). The configuration is such that the seat plate 3 that is substantially the same as that of the first embodiment shown in FIG. 3 is arranged vertically, and thus the detection plate 12 is not urged in the lateral direction (in this case, the right direction) by its own weight. A plurality (four in this case) of springs 31 (biasing means) are interposed between the seat plate body 11 and the sensing lever 17. Therefore, as shown in FIG. 6E, when the sensing plate 12 of the seat plate 3 contacts the obstacle 7, the micro switch 19 is turned on (or turned off in the case of the b contact) via the sensing lever 12, so that the shutter is released. The sliding operation of the curtain 1 is stopped. When the obstacle 7 is removed, the spring 3
Since the sensing plate 12 is returned to the right by the urging force of 1, the micro switch 19 is turned off. With such a configuration, it is possible to obtain the same effect as that of the first embodiment with respect to the horizontal shutter.

[0020]

As described above, according to the present invention,
A sensing lever made of a material having high torsional rigidity is attached along the longitudinal direction of the seat plate, and when the sensing plate comes into contact with an obstacle, the sensing lever is pressed at this part, so the torsional rigidity of the sensing lever is As a result, the sensing lever is pressed in the entire length direction. Therefore, since this can be detected by one detection switch, the cost can be reduced and the configuration can be simplified. Moreover, since it is not necessary to divide the sensing plate of the seat plate into a plurality of parts, the appearance is not spoiled. Further, it is possible to reduce the weight of the sensing plate without requiring the strength for preventing the bending of the sensing plate itself. Further, when applied to a horizontal shutter, if a biasing means such as a spring that biases the detection switch in the off direction when an obstacle is not in contact with the sensing plate is arranged, a method similar to that of the vertical shutter is obtained. Can be used in. Furthermore, since the sensing lever is made of a material having a high torsional rigidity, deterioration due to long-term use is very small, and troubles such as malfunctions and malfunctions are greatly reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a schematic configuration of a vertical shutter to which the present invention is applied.

FIG. 2 is an explanatory diagram showing a schematic configuration of a horizontal shutter to which the present invention is applied.

FIG. 3 is an explanatory diagram showing a configuration of an obstacle detection device for a shutter according to the first embodiment of the present invention.

FIG. 4 is an explanatory diagram showing a configuration of a shutter obstacle detection device according to a second embodiment of the present invention.

FIG. 5 is an explanatory diagram showing a configuration of a conventional shutter obstacle detection device.

FIG. 6 is an explanatory diagram showing a configuration of a tape switch used in a conventional horizontal shutter.

[Explanation of symbols]

 1 Shutter Curtain 2 Guide Rails 3, 101, 111 Seat Plate 4 Winding Shaft 5 Opening / Closing Device 6 Floor 7 Obstacle 8 Lower Guide Rail 9 Hanger Rail 10 Hanger Roller 11, 102 Seat Plate Body 12, 103 Sensing Plate 13, 104 Locking piece 14,105 Stopper 15,16,106 Locking projection 15a Locking piece 16a Pushing piece 17 Sensing lever 17a Convex part 18 Fixing projection 19,107 Micro switch 19a, 107a Detection projection 20,108 Base plate 31 Spring 112 Tape Switch 113a, 113b Contact 116 Contact member

Claims (3)

[Claims] 1. When an elongated seat plate arranged along a front end portion on a closing side of a shutter curtain collides with an obstacle,
In the obstacle detection device for a shutter that detects this collision, the seat plate includes a seat plate main body and a sensing plate that is loosely arranged on the contact side of the seat plate main body when the seat plate main body is closed. A sensing lever that is arranged along the lengthwise direction and is made of a material having a high torsional rigidity, and that is movable by abutting the sensing plate when the sensing plate is pressed toward the seat plate main body; An obstacle detection device for a shutter, comprising: a detection switch that is fixed in the main body and that detects a movement of the sensing lever and switches a contact. 2. The shutter according to claim 1, wherein an urging means for urging the sensing plate away from the seat plate body is interposed between the seat plate body and the sensing plate. Obstacle detection device. 3. The obstacle detecting device for a shutter according to claim 1, wherein the sensing lever is made of aluminum.