JPH04347293A - Obstruction sensor for shutter - Google Patents

Abstract

PURPOSE:To raise the safeness of a shutter by a method in which when the left and right-side pieces of the shutter are stopped by an obstruction, operating frames provided on the left and right sides of the bottom slat are laterally moved, and a sensor provided on one side is operated to stop the operation of the shutter. CONSTITUTION:Slats 3 and the bottom slat 9 on the lowest stage are connected in an expandible manner, and operating levers 11 and 12 are provided to the slat 9 in a butted and laterally movable manner. The descending motion of the slats 3 is switched to lateral motion and the lever 11 is laterally moved to project the slat 9 sidewards by the first motion converting mechanism 16. The descending motion of the slats 3 is switched to lateral motion and the lever 12 is moved laterally to press the lever 11 by the second motion converting mechanism 17. In case where any side of the left and right sides of the slat 9 is stopped by obstruction, the slats 3 go down to project the lever 11. The projection is detected by a photoelectric switch to stop the operation of the shutter. The shutter can thus be quickly stopped and the cost can also be reduced because the sensor is provided on one side.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a shutter that automatically moves up and down, and when the lowering is blocked by an obstacle during the lowering, the obstacle is detected and the lowering drive of the shutter is stopped. The present invention relates to an object sensing device.

0002

2. Description of the Related Art Devices of this type are necessary for ensuring safety in automatic raising/lowering shutters, and have conventionally been installed in various structures. As an example, Utility Model Application Publication No. 3-14299 or Utility Model Application Publication No. 3-2459
The one described in Publication No. 8 is known. In the devices described in both of the above publications, the slats that make up the shutter are connected vertically and retractably to each other, and the bottom slat is prevented from descending by an obstacle, while the upper slat continues to descend. At the same time, the downward movement is switched to a lateral movement to cause the member to protrude outside the side of the bottom slat,
The tape switch is pressed by the protrusion of this member, and the lowering of the shutter is stopped in response to the command.

0003

[Problems to be Solved by the Invention] Incidentally, the above publication states that the protruding member and tape switch may be provided only on one side of the shutter, but each slat of the above structure can be expanded and contracted up and down. If the slats are freely connected and an obstacle is located in the center of the slats, the gap between the slats will be reduced in the same way in the width direction. In some cases, the side of the slat that hits the obstacle stops, and the other side moves down further, causing the slat to tilt. At that time, if the protruding member and tape switch happen to be installed on the side where the obstacle is, it will work without any problem and issue a stop command, but if it is on the opposite side, the slats will be tilted to the extreme. Since the above-mentioned member protrudes only after the vehicle has stopped, there is a time delay before the stop command is activated. In such cases, there was a risk of unexpected accidents resulting in injury or damage due to the large pressure. Therefore, in order to further improve safety, it is actually a good idea to provide the protruding member and the tape switch on both sides of the shutter (in the embodiments of the above-mentioned publications, they are provided on both sides). However, if tape switches are provided on both sides of the shutter, the cost will be high and the installation work will be troublesome. Furthermore, control to sense both tape switches is required, making the control complex.

SUMMARY OF THE INVENTION Therefore, the present invention aims to provide a shutter that can reliably and quickly respond to the detection of an obstacle even if it is on one side of the shutter, and that can be easily installed. An object of the present invention is to provide an obstacle sensing device.

[0005]

[Means for Solving the Problems] The solution according to the present invention includes an actuating rod that operates a sensor for instructing the shutter to stop descending, in the bottom slat of a shutter in which a plurality of slats are telescopically connected to each other; When the lowering of the bottom slat is stopped due to an obstacle, the lowering motion of the upper slat is changed into a lateral movement by a motion conversion mechanism that connects the operating lever to the other operating lever that faces the operating lever. One of the operating rods is provided so as to be able to protrude outward from inside the bottom slat, and the other operating rod is provided so as to be movable in the direction in which the operating rod is projected.

[0006]

[Operation] Therefore, if the motion conversion mechanisms of both operating rods are arranged at both ends of the bottom slat, when there is an obstacle on one side, for example on the protruding operating rod side, the operating rod will move from the slat. Even if the operating rod protrudes outward and is on the other side, the operating rod will protrude out of the slat, so even if the slat is tilted to the left or right, the operating rod will not move This activates a sensor that instructs the shutter to stop lowering. Furthermore, since the sensor only needs to be provided on one side that corresponds to the operating rod, the shutter can be easily attached and operated, and control can also be simplified.

[0007]

[Embodiment] To explain an embodiment of the present invention, the entire structure of the shutter is shown in FIG. A motor 4 is connected to one end of the winding and winding shaft 2, and both ends of each slat 3 are formed to move up and down along guide rails 5, 5 hanging down from both ends of the shutter case 1. be. Furthermore, a sensor 6 made of a reflective photoelectric switch is attached to a portion of the shutter case 1 facing one guide rail 5 (on the right side in the figure).

As shown in FIG. 1, each of the slats 3 has a hook piece 7 projecting from the upper surface of the hollow member over the entire length in the longitudinal direction, and the hook piece 7 of the lower slat 3 is provided on the lower surface.
The slats 3 are provided with a groove 8 for receiving the slats, and the rising length of the hook piece 7 is made long to connect the slats 3 to each other in a flexible manner. Furthermore, a bottom slat 9 is connected to the lowest stage of the slats 3, and its form is similar to that of each of the slats 3.
It has the same structure as the slat 3, and its vertical width is larger than that of the other slats 3. Further, caps 10 are fitted into both end openings of each slat 3 including the bottom slat 9.

Inside the bottom slat 9, as shown in FIG.
. It is inserted into a hole and supported, and when it moves laterally, its tip protrudes to the side of the cap 10c, as shown in FIG. is installed. Further, the second operating rod 12 is supported on a pair of rollers 14, 14 provided on the left and right sides of the bottom slat 9. It is preferable to provide mohair 15 on the top surface of the first operating rod 11 for wiping the top surface of the reflecting mirror 13.

Further, the first and second operating rods 11 and 12 are connected to each other so that the bottom slats 9 are telescopically connected, although the lowering of the bottom slat 9 is stopped due to an obstacle during the lowering of the shutter. Since the movement further descends, the movement is moved in the lateral direction by the first and second movement conversion mechanisms 16 and 17, which switch the downward movement into lateral movement.

As shown in FIG. 2, the first motion converting mechanism 16 has a first stroke bar 18 suspended vertically movably from the cap 10a of the upper slat 3, and the stroke bar 18 is attached to the bottom slat 9. When inserted into the cap 10c and when the shutter is normally lowered, the lower surface of the stroke bar 18 is formed to have a length that is flush with the lower surface of the bottom slat 9. Further, a compression spring 19 is fitted into the cap 10a of the upper slat 3 so as to face the upper end of the stroke bar 18. Furthermore, a projecting piece 20 is provided in a protruding manner at the middle of the portion of the bottom slat 9 of this stroke bar 18 that is inserted into the cap 10c. And bottom slat 9 cap 10c
A first lever 21 in the shape of a bell crank is attached within the shutter so as to be swingable in the left-right direction of the shutter about a fulcrum a, one end of the first lever 21 abuts the lower surface of the protruding piece 20, A notched groove 2 whose other end is provided in the first operating rod 11
2 is engaged. Furthermore, the biasing force of a double-acting spring 23 provided in the cap 10c of the bottom slat 9 is applied to a portion below the fulcrum a of the first lever 21 via a projecting rod 24. One end of the first lever 21 is pressed against the protrusion 20, and the first operating rod 1
1 is held within the bottom slat 9.

Therefore, as shown in FIGS. 4 and 5, the lowering of the bottom slats 9 is stopped due to the obstruction near the first operating rod 11 during the lowering of the shutter, but the upper slats 3 are further lowered. Since the first stroke bar 18 continues to move downward, the first lever 21 tilts as the first stroke bar 18 descends, causing the first actuating rod 11 to protrude to the side, and this protrusion causes the sensor 6 to operate. This will stop the shutter from lowering. If the obstacle is removed, the tilted bottom slat 9 will return to its normal position due to its own weight, and the first stroke bar 18 will rise relatively. It returns to its original state and the first operating rod 11 is housed within the bottom slat 9.

Next, as shown in FIG. 2, the second motion converting mechanism 17 moves the second stroke bar 25 from the cap 10b of the upper slat 3 to the compression spring 19 in the same way as the first stroke bar 18. There is also a projecting piece 20 in the middle of the part of the second stroke bar 25 that is inserted into the cap 10d of the bottom slat 9.
is installed protrudingly. On the other hand, a link 26 is provided on the cap 10d with its center part as a fulcrum b, and a substantially triangular second lever 27 is pivoted at a fulcrum c, and the upper end of the second lever 27 is connected to a second actuating rod. The second lever 27 and the link 26 are arranged in a dogleg shape and pivotally supported, and one end of the link 26 is connected to the protruding piece 20.
It is pivotally attached to the toggle shape.

In this case as well, as shown in FIGS. 6 and 7, the lowering of the bottom slat 9 is stopped due to an obstacle near the second operating rod 12 during the lowering of the shutter, but the upper slat 3 Since it continues to descend, the second stroke bar 25 also descends, so that the connection point between the link 26 and the second stroke bar 25 is lowered, and the connection point between the link 26 and the second lever 27 is lowered. On the contrary, since it rises, the second lever 27 rotates around its fulcrum c, and the second operating rod 12 is moved in the direction of pushing out the first operating rod 11, so that at the same time the first movement conversion mechanism 16 The first lever 21 is tilted, thereby causing the first operating rod 11 to protrude in the same manner as described above, and this protrusion activates the sensor 6 to stop the shutter from lowering. If the obstruction is removed, the slanted bottom slat 9
assumes a normal posture due to its own weight, and the second stroke bar 25 rises relatively, so the first lever 21 moves back to its original state by the double-movement spring 23, and the first operating rod 11 moves back to the bottom position. At the same time that the second actuating rod 12 is accommodated within the rat 9, the second actuating rod 12 is moved back by the first actuating rod 11.

Note that since the sensor 6 employs a reflective photoelectric switch, a reflective mirror 1 is attached to the first operating rod 11.
3, but the sensor is not limited to this type, and as shown in FIGS. 12 and 13, a sensor 6 made of a tape switch is attached to the guide rail 5 on the side from which the first operating rod 11 protrudes. In this case, the first actuating rod 11 does not require a reflecting mirror, and the tip thereof is formed into a hemispherical round shape.

[0016]

According to the obstacle sensing device for a shutter according to the present invention, a pair of left and right operating rods are provided in the bottom slat so as to be movable laterally and abut each other, so that the vertical movement is changed from the horizontal reciprocating movement. Both actuating rods are configured to move forward in the same direction by a motion conversion mechanism that switches to the same direction, and one of the actuating rods is configured to be able to protrude outside the bottom slat by the movement, so that one end of the shutter, i.e. If there is an obstacle on the side of the operating rod that protrudes to the outside of the bottom slat, the movement conversion mechanism at one end causes the operating rod to protrude to the outside of the bottom slat, and this protruding action activates a sensor to stop the shutter from lowering. In addition, when there is an obstacle on the opposite side, the other operating rod moves by the corresponding motion conversion mechanism and pushes out the opposing operating rod, resulting in the above-mentioned situation. Similarly, the lowering of the shutter is stopped.

Therefore, even if there is an obstacle near either end of the shutter, only one of the actuating rods will protrude outside the bottom slat, so the sensor will only be placed on the side where the actuating rod protrudes. This eliminates the need for complicated installation work when assembling the shutter, allowing for easy and quick installation.

Furthermore, even if the obstacle is biased to one side, the operating lever on the biased side will move first, and since the left and right operating levers are provided so as to butt against each other, the obstacle will not be removed. No matter which way it is biased, one operating rod will surely protrude,
The generation of a stop command in response to the detection of an obstacle becomes faster, further increasing safety.

[Brief explanation of drawings]

1 is a right sectional view of a shutter equipped with an obstacle sensing device according to the invention; FIG.

FIG. 2 is a sectional view showing an obstacle sensing device for a shutter according to the present invention.

FIG. 3 is a left sectional view of the shutter.

FIG. 4 is a sectional view showing a state in which the distance between the upper and lower slats is shortened.

[Figure 5] First case when there is an obstacle on the right side of the shutter
FIG. 3 is a cross-sectional view showing the operation of the operating rod.

[Figure 6] First case when there is an obstacle on the left side of the shutter
, is a sectional view showing the operation of the second operating rod.

7 is a left sectional view in FIG. 6. FIG.

8 is a right sectional view of FIG. 9. FIG.

FIG. 9 is a sectional view showing the state when the shutter is completely closed.

FIG. 10 is a left sectional view of FIG. 9;

FIG. 11 is a sectional view showing the entire structure of the shutter.

FIG. 12 is a cross-sectional view of a shutter provided with a similar sensor, viewed from above.

FIG. 13 is a sectional view seen from the front in FIG. 12;

[Explanation of symbols]

3 Slats 6 Sensor 9 Bottom slat 11 First operating rod 12 Second operating rod 16 First motion conversion mechanism 17 Second motion conversion mechanism

Claims (1)

[Claims] 1. A bottom slat (9) of a shutter in which a plurality of slats (3) are telescopically connected to each other is provided with an operating rod (11) for operating a sensor (6) for instructing the shutter to stop descending. , and another operating rod (12) that butts against and opposes the operating rod (11), so that when the lowering of the bottom slat (9) is stopped due to an obstacle, the upper slat (3) continues to lower. Through each movement conversion mechanism (16, 17) that switches a downward movement into a lateral movement, one operating rod (11) can protrude outward from inside the bottom slat (9), and the other operating rod (12) An obstacle sensing device for a shutter, characterized in that the operating rod (11) is movable in a protruding direction.