JPS64559B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fire and smoke prevention shutter equipped with a safety device.

In conventional fire and smoke prevention shutters, when the brake release device's motor and solenoid are activated by the output of the fire detector or the start switch, and the shutter brake is released, the shutter falls to the floor under its own weight, causing a fire or smoke. Since it was constructed to block off the tunnel, there was a risk that anyone trying to pass through would be crushed by the falling shutters and injured.

Therefore, fire and smoke prevention shutters have been proposed that are equipped with a safety device that temporarily stops the shutter from descending if someone tries to pass under it while it is descending.

However, conventional fire and smoke prevention shutters equipped with such safety devices are able to stop temporarily by detecting the presence of a person in the vicinity while the shutter is descending under its own weight. The pin protrudes to catch the shutter midway through its descent, and when there are no more people present, the stop pin is retracted to allow the shutter to resume its descent. Therefore, once the descent is resumed from a pause at a given height, it is no longer possible to pause even if someone tries to pass under the shutter again until it descends to the floor. In such a case, there was still a risk of being caught in the shutter. This also applies if the shutter does not pause at a predetermined height.

In view of the above points, this invention provides the following,
A shutter that descends under its own weight when the brake of the shutter drive device is released by the output of a fire detector or a start switch, and its descent is temporarily stopped by detecting the presence of a person near the shutter during its descent. , until the shutter has descended to a predetermined height that is necessary to prevent the spread of flames or smoke in the early stages of a fire and allows people to pass under it, even if someone attempts to pass under it, A person who continues to monitor the presence of humans by making it possible to detect the presence of humans in the vicinity of the shutter when the shutter descends to that height, and thereafter attempts to pass under it until the shutter descends to the floor. Each time the brake is released, the brake release device is restored based on the detection output, and the temporary stop is repeated.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A fire and smoke prevention shutter according to an embodiment of the present invention will be explained below with reference to FIGS. 1 and 2.

In the figure, C indicates a shutter drive device that controls the opening and closing of the shutter curtain S, including a shutter motor M, a shutter brake B, and a brake release device.
Consists of ER. LSH is Shutter Curtain S
The LSD is a limit switch as a fall detection device whose contacts close when the shutter curtain S falls to a predetermined height, for example, 0.8 m to 1.0 m above the floor, and the LSD is a limit switch whose contacts open when the shutter curtain S falls to the floor. LSH and LSD in Fig. 1 indicate the position of the shutter curtain S when the limit switch operates, and are actually mounted on the drive device.
The position is controlled by counting the rotations of motors, etc.
The LS of the brake release device ER is a micro switch whose contacts open when the motor rotates, and the motor m is a relay contact n or a push button switch contact that is activated by the operation of a fire detector, and a limit switch LSD, LS, which will be described later. through the break contact r' of the relay R and the brake release device.
The electromagnetic clutch X, which holds the ER in the released state, is connected to the power supply through a contact n, a limit switch LSD, and a contact r', respectively. In addition, L and D are a light emitter and a light receiver as a proximity switch installed on a pillar or wall near the shutter guide rail Y of the shutter curtain S.
A light receiving section consisting of Cds, transistor Tr, relay A, etc. is connected to the power supply through contact n and limit switch LSH, and timer T and timer T
A relay R as a recovery control device of a brake release device ER having a break contact t in series is connected to a power source through a contact n, a limit switch LSH, and a parallel circuit of contacts a and r of relays A and R.

Next, to explain the operation of this shutter, when a fire detector (not shown) is activated and contact n is closed, motor m of brake release device ER is activated by relay R.
operates through contact r' and limit switches LS and LSD to release brake B of shutter drive device C, and even when electromagnetic clutch Curtain S begins to fall under its own weight. When the shutter curtain S descends to 0.8m to 1.0m above the floor, the limit switch LSH closes and power is supplied to the emitter L and receiver D. Light is emitted from the emitter L to the Cds of the receiver D, and the proximity switch is activated. It becomes detectable. If someone tries to pass under the falling shutter curtain S in such a state, the light to the light receiver D will be blocked, the resistance of Cds will increase, the transistor Tr will become conductive, and the relay A will be turned on. Operate.
This operation of relay A causes relay R to operate and contact
When r' is opened, the power to the electromagnetic clutch X of the brake release device ER is cut off, so the electromagnetic clutch
is restored, the brake release device ER is also restored, and the lowering of the shutter curtain S is stopped. On the other hand, when the timer T is started by the other contact r of the relay R and the contact t is opened after, for example, 30 seconds, the relay R is restored and the motor m is operated through the contact r', and the electromagnetic clutch X is energized and the brake release device When the ER operates, the shutter curtain S descends from the stop position again, and the limit switch LSD, which lowers to the floor, opens and the power to the electromagnetic clutch X is cut off, causing the shutter curtain S to stop. Furthermore, if several people pass through one after another after the shutter curtain S has resumed lowering, the above operation is repeated and the shutter curtain S is temporarily stopped each time to ensure safety. Note that when power is supplied to the emitter L and the receiver D, if no one tries to pass under the shutter curtain S, the receiver D
Since the shutter curtain S does not operate, the shutter curtain S descends to the floor without being stopped in any way.

Furthermore, in the above embodiment, an optical switch consisting of a light emitter and a light receiver was used as a proximity switch to detect the presence of a person near the shutter. Other proximity switches used may also be used.

The shutter of this invention is constructed as described above,
When the brake of the shutter drive device is released by the output of the fire detector or the start switch, and the shutter starts to descend under its own weight, a predetermined distance is required to prevent the spread of fire or smoke in the early stages of a fire, and which allows people to pass under it. Until you descend to a height
Even if someone tries to pass under the shutter, it continues to descend, and when the shutter has descended to a predetermined height, the presence of humans in the vicinity of the shutter can be detected, and the presence of humans is monitored;
After that, if someone tries to pass under the shutter until it descends to the floor, the brake release device will be restored by the above detection output each time and the temporary stop will be repeated, so there is no risk of being caught and it is safe. This has the effect of providing a fireproof and smokeproof shutter.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an embodiment of the shutter of the present invention, and FIG. 2 is a circuit diagram thereof. S...Shutter curtain, Y...Shutter guide rail, C...Shutter drive device, M...Shutter motor, B...Brake, ER...Brake release device, m
...Brake release device motor, X...Electromagnetic clutch, LS...Brake release device micro switch,
LSH, LSD...Limit switch, L...Floodlight,
D...Receiver, A, R...Relay, T...Timer.

Claims (1)

[Scope of Claims] 1. A shutter curtain, a shutter drive device that controls the opening and closing of the shutter curtain, and a brake of the shutter drive device that is released by the output of a fire detector or a start switch to open the shutter curtain. In a fire prevention/smoke prevention shutter comprising a brake release device for lowering the shutter curtain by its own weight, and a proximity switch for detecting the presence of a person near the shutter curtain, the lowering of the shutter curtain's own weight is temporarily stopped by the output of the proximity switch. , a drop detection device that detects when the shutter curtain has descended to a predetermined height; and a drop detection device provided near the shutter curtain, which is normally not in a detection state but becomes detectable by the output of the drop detection device. The fire prevention system is characterized by comprising: the proximity switch that is controlled; and a recovery control device that restores the brake release device and temporarily stops the drop of the shutter curtain's own weight each time the proximity switch generates a detection output. Smoke shutter safety device. 2. The safety device for fire and smoke prevention shutters according to claim 1, wherein the descent detection device is a limit switch that is activated when the shutter curtain falls to a predetermined height. 3. The safety device for fire and smoke prevention shutters according to claim 1 or 2, wherein the detection output of the proximity switch is output for a short time and then restored.