JPH11311075A - Automatic return mechanism for automatic closing device in shutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reset the brake function of a shutter positively and accurately in automatic return mechanism for releasing a brake of the shutter automatically by sensing heat, smoke, and the like by a sensor in the case of the outbreak of a fire so as to make a shutter curtain descend of its own weight and stopping the descent of the shutter curtain by the recovery of the brake function when the shutter curtain comes in contact with a floor face. SOLUTION: A fixture 9 is provided with a linearly movable base 10. A screw shaft 12 is journalled to the base 10, and a slide block 14 is thread- fastened to the screw shaft 12 to allow the slide block 14 to be reciprocated within a specified range in association with the rotation of the screw shaft 12 rotated being interlocked with an output shaft of a shutter 1. In the rotation locked state of the screw shaft 12 due to the slide block 14 abutting the base 10, the base 10 is moved by the rotation of the output shaft of the shutter 1 to reset brake function.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic return device that can reliably stop a shutter curtain at a predetermined position when a shutter detects heat or smoke in a fire and automatically closes. It is. Here, the shutter includes a fireproof shutter, a smokeproof shutter, a banner, a fireproof panel, and the like.

[0002]

2. Description of the Related Art Heretofore, fire protection shutters have been configured to detect smoke or heat and automatically close when a fire occurs. In other words, this is to prevent smoke and flame from moving to the next by descending the shutter curtain, and such large fireproof shutters are installed in large buildings.
By the way, the fire prevention shutter operates simultaneously with the occurrence of a fire, but the shutter curtain is lowered by its own weight on the assumption that the power is turned off, and is provided in the fire alarm equipment as an emergency power supply. Excitation operation of the solenoid by the storage battery, driving of the DC motor, unlocking the coil spring pre-compressed or tensile deformation, and using the repulsive elastic force to release the brake of the switchgear The shutter curtain is lowered by its own weight.

In order to restore the lock once it has been released, the coil spring must be manually or automatically returned. However, as in the case of a shutter brake control device according to Japanese Utility Model Application Laid-Open No. 63-64849, the coil spring is not used. Is a solenoid or DC motor. Also, as in the automatic reset type automatic closing device according to Japanese Utility Model Application Laid-Open No. 3-46695, there is a method of mechanically resetting by using the rotation of the main shaft of the opening / closing device due to the self-weight drop of the shutter curtain instead of electric power.

[0004] When the shutter curtain descends by its own weight and the brake of the switch remains open even when the shutter curtain is fully closed, the take-up shaft continues to rotate as it is by inertia. Curtains may dub and sometimes cause reverse winding. Therefore, when the shutter curtain is lifted later, the shutter curtain which is in the reverse winding state falls down with the normal rotation of the winding shaft, which is very dangerous. In order to solve such a situation, it is possible to use an emergency DC power supply to return the motor electrically, but if the disaster prevention signal is cut off before the shutter curtain is fully closed, it can be recovered. Or electric capacity may be insufficient.

For this reason, the mechanical reset type is more reliable, but the automatic reset type automatic closing device disclosed in Japanese Utility Model Laid-Open No. 3-46695 has the following problems. That is, the operation rod is moved to the driven sprocket side by the return nut, the operation of holding the lock state by engaging the ratchet step teeth and the ratchet lock pawl, and the swing operation lever releasing the brake is returned. It is difficult to take the timing to stop rotation. Normally, a brake device of a switchgear has a structure in which brake members are pressed against each other at a driving source and rotation is stopped by the frictional force, and the reduction ratio is 1/50 to 1/1.
Since it is about 00, the timing of stopping based on the rotation of the output shaft becomes very delicate.

If the swing operation lever returns quickly, the ratchet pawl is not locked because the ratchet pawl is not completely engaged. If the shutter curtain is opened and the return nut moves in the opposite direction to the driven sprocket, there is a possibility that the operating rod pushes the swing operation lever and the brake is released.

[0007]

As described above, the conventional automatic return device for the automatic closing device in the shutter has the above-mentioned problems. The problems to be solved by the present invention are these problems, and an automatic return device capable of stopping the descent of the shutter curtain at a predetermined position by reliably and accurately returning the brake function of the switchgear is provided. .

[0008]

The automatic return device of the present invention mechanically recovers the brake function of the switch to stop the descending shutter curtain at a predetermined position. Therefore, a screw shaft that rotates in conjunction with the output shaft of the switch is provided, and a slide block is screwed to the screw shaft, and the slide block can reciprocate along the screw shaft with the rotation of the screw shaft. It is made up of

The slide block is provided with a stopper for stopping the reciprocating movement of the slide block at a predetermined position and locking the rotation of the screw shaft. When the rotation of the screw shaft is locked and stopped, the base supporting the screw shaft can be moved by the rotation of the output shaft of the switchgear. The return wire is connected so that the movement of the base returns the automatic closing device.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The rotation of the output shaft of a switchgear is transmitted to a screw shaft to rotate the screw shaft, but a sprocket is attached to the screw shaft and the output shaft to wind a chain, Gears can be attached to mesh with each other. The screw shaft is a shaft formed with a screw or a shaft having a screw, and a slide block screwed to the screw shaft moves with rotation. Since the slide block is guided so as not to rotate, the screw shaft can rotate within a movable range.

However, if the slide block hits the stopper and stops, the rotation of the screw shaft is disabled, but the base on which the screw shaft is mounted moves together with the screw shaft. This movement form is a linear movement, a rotational movement, or a swing movement, and differs depending on the mounting form of the base. The automatic closing device is connected to the base via a return wire, and the movement of the base restores the braking function, so that the shutter curtain can be stopped at a predetermined position. That is, the moving distance of the slide block is regulated by the stopper so that the shutter curtain can be stopped at a predetermined position. Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an opening / closing device provided with a shutter automatic return device, wherein 1 denotes a switch, 2 denotes an automatic return device, 3 denotes a winding shaft, and 4 denotes a shutter curtain. The take-up shaft 3 is rotated by the motor 5 of the opening / closing device 1, and the shutter curtain 4 can be taken up or rewound by the take-up shaft 3 to move the shutter curtain 4 up and down. The rotation of the motor 5 is achieved by winding a chain 8 around a sprocket 6 provided on the main shaft and a sprocket 7 provided on the winding shaft 3, and rotating the winding shaft 3.

When a fire occurs, the sensor senses heat or smoke and descends the shutter curtain 4. In this case, the automatic release device 29 pulls the brake release wire 30 to brake the switchgear 1. By opening the shutter curtain 4, the shutter curtain 4 can naturally descend by its own weight. The descending speed of the shutter curtain 4 gradually increases, and the winding shaft 3 continues to rotate due to inertia even when the lower end of the shutter curtain 4 hits the floor, so that the shutter curtain 4 is wound in the opposite direction.

The above-mentioned automatic return device is provided to prevent such a situation, and restores the brake function so that the shutter function can be stopped when the shutter curtain touches the floor or approaches the floor. . FIG. 2 shows an embodiment of the automatic return device, in which a base 10 is slidably mounted on a mounting 9 and a sprocket 11 is rotatably supported on the base 10 so that the sprocket 11 can rotate. In the figure, a screw shaft 12 in which a screw is cut extends.

A guide 13 extends on the base 10 along a screw shaft 12, and a slide block 14 is screwed to the screw shaft 12. Therefore, the slide block 14 can move along the guide 13 if the screw shaft 12 rotates. The screw shaft 12 rotates with the rotation of the sprocket 11 to move the slide block 14, but if the slide block 14 contacts the base 10, the screw shaft 12 cannot rotate.

As shown in FIG. 1, the sprocket 11 meshes with the chain 8, and if the shutter curtain 4 descends, the sprockets 7 and 6 rotate, and the chain 8 travels inevitably. Therefore, the sprocket 11 meshing with the chain 8 is turned, and the slide block 14 can move with the rotation of the screw shaft 12. When the shutter curtain 4 descends to a predetermined position, the slide block 14 The rotation of the sprocket 11 is stopped by contact with the sprocket 11. However, the shutter curtain 4 still descends due to inertia, and pulls the sprocket 11 meshing with the chain 8 together with the base.

The distal end of a return wire 15 is connected to the base 10 by screwing, and the spring force of a coil spring 16 is urged to fit into one end of the fixture 9. The base 10 slides along the guides 17a and 17b together with the sprocket 11, and extends the coil spring 16 and pulls the return wire 15 to return the automatic closing device 29, thereby restoring the braking function. When the brake function returns, the rotation of the winding shaft 3 stops, and the shutter curtain 4 also stops.
When the shutter curtain 4 moves up and down as usual, the slide block 14 reciprocates along the guide 13 with the rotation of the screw shaft 12.

FIGS. 3 and 4 show another embodiment of the return device according to the present invention.
A sprocket 20 is attached to the tip of the screw shaft 19. Accordingly, the screw shaft 19 can rotate together with the sprocket 20, and the base 21 is supported on the screw shaft 10 so as to be swingable. Of course, the support portion of the base 21 does not have a screw, the ball bearings 22 are arranged on both sides, and the guide rod 23 is provided along the screw shaft 19.

A slide block 24 is screwed onto the screw shaft 19, as in the above embodiment, and can reciprocate with the rotation of the screw shaft 19. On this occasion,
The guide bar 23 prevents the slide block 24 from rotating.
, And reciprocates on a straight line along the guide rod 23.
If the slide block 24 hits the base 21, it cannot move any further and the screw shaft 19
Rotation stops.

However, the sprocket 20 of the return device connected via a chain to the sprocket attached to the output shaft of the switchgear 1 continues to rotate. Will be turned. On the side plate 25 of the attachment 18, curved long grooves 26a and 26b around the screw shaft 19 are provided in pairs. A pin 27a fixed to and protruding from the side plate 28 of the base 21 extends through the curved long groove 26a, and one pin 27b extends through the curved long groove 26b.

Accordingly, the base 21 is provided with a curved elongated groove 26.
a, 26b can be swung within the range of
Is pulled by the movement of the pin 27a accompanying the swing of the base 21, and as a result,
The brake function will return. One pin 27b
Is connected to a coil spring 28, and the base 21 is positioned by the spring force of the coil spring 28. Accordingly, the rotation of the slide block 24 is stopped when the slide block 24 comes into contact with the base 21, and the base 21 swings about the screw shaft 19.
Is pulled, and the return wire 15 is pulled.

FIGS. 5A and 5B show a case where the return device is mounted on the switchgear 1. FIG. The return wire 15
Is connected to the automatic closing device 29 of the switchgear 1. In addition, since the return device is provided with a pair of curved long grooves 26a and 26b, the switch 1 is opposed by connecting the return wire 15 to the pin 27b and the coil spring 28 to the pin 27a. Even if it is attached to the side, it can be used also.

As described above, in the automatic return device of the automatic shutter closing device according to the present invention, the slide block is screwed to the screw shaft and the screw shaft is attached to the base. Is reciprocated, and when the shutter curtain comes into contact with the floor, the movement of the slide block is locked to move the base, and the movement of the base restores the braking function. The following effects are obtained. I can do it.

[0024]

The automatic return device of the present invention is of a mechanical type,
Since it is not an electric type, there is no electrical trouble and the operation is stable, and the brake function of the switchgear can be reliably restored. Then, the slide block is screwed onto the screw shaft, and the moving range in which the slide block hits the base stopper and stops is adjusted, so that the position where the shutter function is restored and the shutter curtain stops is determined. This device is a highly versatile device that can be attached to an existing shutter.

[Brief description of the drawings]

FIG. 1 shows a shutter opening / closing device provided with an automatic return device.

FIG. 2 is an embodiment of an automatic return device according to the present invention.

FIG. 3 is a sectional view of another automatic return device according to the present invention.

FIG. 4 is a side view of another automatic return device according to the present invention.

FIG. 5 is a shutter opening / closing device provided with an automatic return device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 switchgear 2 automatic return device 3 take-up shaft 4 shutter curtain 5 motor 6 sprocket 7 sprocket 8 chain 9 mounting tool 10 base 11 sprocket 12 screw shaft 13 guide 14 slide block 15 return wire 16 coil spring 17 guide 18 mounting tool 19 screw Shaft 20 Sprocket 21 Base 22 Ball bearing 23 Guide rod 24 Slide block 25 Side plate 26 Curved long groove 27 Pin 28 Side plate 29 Automatic closing device 30 Brake release wire

[Procedure amendment]

[Submission date] November 24, 1998

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

Claims (3)

[Claims] 1. When a fire occurs, heat or smoke is sensed by a sensor, and a brake of a switchgear is automatically released to lower a shutter curtain by its own weight and contact a floor surface, or a floor surface. In the automatic return device in which the brake function recovers and the shutter curtain can be stopped when approaching, a base is provided on the fixture so that it can move linearly or rotationally, and the base has a screw shaft. At the same time as supporting and screwing the slide block to the screw shaft,
The slide block can be reciprocated within a predetermined range with the rotation of the screw shaft rotating in conjunction with the output shaft of the switch, and the base is biased by a spring force so that the slide block is fixed at a fixed position. A return wire extending from the switch is connected to the base so that the base is moved by the rotation of the output shaft of the switch when the rotation of the screw shaft is locked against the base and the brake function is restored. Automatic return device for automatic closing device in the shutter to be turned on. 2. A base is provided on a mounting so as to be able to move linearly along a guide, and a sprocket meshing with a chain wound around to transmit a motor output of a switch to a winding shaft is provided on a screw shaft end. 2. An automatic return device for an automatic closing device in a shutter according to claim 1. 3. A screw shaft is supported by the mounting member, a base is swingably supported by the screw shaft, and a rotation of a motor output shaft of a switch and a transmission chain are provided at a screw shaft end. 2. An automatic return device for an automatic closing device in a shutter according to claim 1, wherein an integrally rotating sprocket is mounted.