JPH0137113Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an emergency release device for an electric shutter that is attached to an opening in a building.

[Problems to be solved by the prior art and the invention] Generally, in this type of electric shutter, the electric motor is normally driven by an AC power source to open and close the opening, but in the event of a disaster such as a fire, etc. Since there is a risk that the AC power supply may be cut off, it is necessary to provide some kind of emergency release means. Therefore, in the past, manual release devices that rotate the motor shaft by operating a hand chain, etc., or devices that perform emergency release using the water pressure of a fire engine were installed, but the manual release device described above opens the shutter. Since it is necessary to operate the hand chain and release the brake at the same time, there is a problem in operability as an emergency release device, and there is also the drawback that it takes a very long time to release the brake. In addition, with systems that use water pressure, the shutter cannot be opened until the arrival of a fire engine, which may pose a safety issue in the event of a disaster, but this system is large and has a complex structure. It was extremely expensive. Therefore, it has been proposed that a DC electric motor be provided separately from the AC electric motor, and that this be configured to be driven by a charged DC current in the event of an emergency to open the emergency. Since two types of electric motors must be provided, the entire device inevitably becomes larger, and there are disadvantages such as an increase in cost.

[Means for Solving the Problem] The present invention was devised in view of the above-mentioned circumstances with the aim of providing an emergency release device for an electric shutter that can eliminate these drawbacks. In an electric shutter that uses a motor to open and close a shutter curtain, the electric motor is provided with a rectifying means for rectifying the alternating current power source and a charging means for charging the direct current output from the rectifying means. and a DC current output from the charging means when the emergency release operation means is operated in an emergency when the supply of AC power is cut off, respectively, as power sources to drive a DC electric motor, and the DC electric motor is driven by the It is characterized by a structure in which the shutter is opened in normal and emergency situations using the driving force of an electric motor.

With this configuration, the present invention enables the shutter to be opened easily and quickly in both normal and emergency situations using a single type of DC electric motor.

[Example] Next, an example of the present invention will be described based on the drawings. In the drawings, reference numeral 1 denotes a DC electric motor installed in an electric shutter, and the DC electric motor 1 uses its driving force to move up and down a shutter curtain (not shown) to open and close an opening. The DC electric motor 1 includes a reduction gear 2 using a worm and parrot wheel mechanism, thereby eliminating the need for a conventional brake and brake release device.

Furthermore, the control circuit of this embodiment will be explained based on FIG. In this circuit, the DC electric motor 1 is connected to a lift control circuit 4 via a forward/reverse switch 3, while the forward/reverse switch 3 is connected to an AC power source via a rectifier circuit 5. And always,
Opening push button switch PBU, closing push button switch
By switching the forward/reverse switch 3 based on the operation of the PBD and the stop push button switch PBS, the DC current rectified by the rectifier circuit 5 flows to the DC electric motor 1 to drive it in forward and reverse directions. Therefore, normal opening/closing control is performed.

On the other hand, the AC power source is wired in parallel to the power supply circuit from the rectifier circuit 5 to the DC electric motor 1 side and connected to the battery 6, but the battery 6 is normally connected to the rectifier circuit and the current limiter. A current is supplied through a charging circuit 7 including the circuit, so that the battery 6 is always kept in a charged state. Furthermore, 8 is a push button switch for emergency opening, and the push button switch 8 is
A switch contact 9 such as a smoke detector and a contactor contact 10 form a parallel circuit, and this parallel circuit includes an electromagnetic contactor 12 including the contactor contact 10 and a contactor contact 11 described below, and the limit switch 13. Upper limit switch contact 14, relay switch contact 1 of the electromagnetic relay 15 provided in the normal opening/closing control circuit
6 is connected in series. In an emergency, when the pushbutton switch 8 or the switch contact 9 is closed, the contactor contacts 10 and 11 are closed by energizing the electromagnetic contactor 12, whereby the emergency open control circuit is kept in a self-maintained state. When the shutter curtain rises to the upper limit position, the upper limit switch contact 14 opens and the electromagnetic contactor 12 self-holds the shutter curtain. is released, and along with this, the drive of the DC electric motor 1 is stopped and the shutter curtain is held in an open state. Further, when the AC power is energized, the relay switch contact 16 is open, so that battery power is not applied to the DC electric motor 1.
Note that these control circuits are installed in the control panel A. Furthermore, in the figure, 17 is a smoothing capacitor.

In the embodiment of the present invention configured as described above, the shutter curtain is normally raised and lowered by the driving force of the DC electric motor 1 driven by a DC power source obtained by rectifying an AC power source to open and close the opening. In an emergency when the AC power is cut off, by operating the emergency release push button switch 8, the DC electric motor 1 is driven using the battery 6, which is always kept in a charged state by the AC power, as a power source to start the shuttle. This will cause the tar curtain to rise to the fully open position.

As described above, in the present invention, although the shutter is opened in an emergency when the AC power supply is cut off, it can be easily opened in an emergency by operating the push button switch in the same way as a normal opening/closing operation. Therefore, in the event of an emergency such as a fire, the system can be opened quickly without any confusion, and as a result, safety in an emergency can be significantly improved. Moreover, this device uses one type of DC electric motor 1 for both normal and emergency opening operations, so two types of electric motors are prepared: an AC electric motor and a DC electric motor. In addition to simplifying the structure, the entire opening/closing machine can be clearly made lighter and more compact, and the electric motor can also be used effectively, making it cheaper. .

[Operations and Effects] In short, the present invention is constructed as described above, so even when the AC power is cut off in an emergency such as a fire, the DC electric motor can be driven to perform normal opening/closing operations. The shutter can be opened automatically without any changes. Therefore, it is possible to open the emergency door quickly and without the confusion of manual release type or fire engine water pressure release type, and as a result, it is an extremely superior product that can significantly improve safety in an emergency. It can be made into Furthermore, since the DC electric motor that opens and closes in emergencies also drives the opening and closing in normal times, it is only necessary to incorporate one type of DC electric motor into the switch, which simplifies the structure. Of course, the entire opening/closing machine can be obviously made lighter and more compact, and the electric motor can be effectively used both in normal and emergency situations, is inexpensive, and the installation work is simplified, which is extremely convenient.

[Brief explanation of drawings]

The drawings show an embodiment of the emergency release device for an electric shutter according to the present invention, and FIG. 1 is a front view of the emergency release device, and FIG. 2 is a circuit diagram of the emergency release device. In the figure, 1 is a DC electric motor, 5 is a rectifier circuit, and 6 is a DC electric motor.
7 is a battery, 7 is a charging circuit, and 8 is an emergency push button switch.

Claims (1)

[Scope of utility model registration request] An electric shutter that uses an electric motor to open and close a shutter curtain is provided with rectifying means for rectifying the alternating current power supply and charging means for charging the direct current output from the rectifying means, and the electric motor is provided with A DC electric motor is driven by the DC current outputted from the means and the DC current outputted from the charging means when the emergency release operation means is operated in an emergency when the supply of AC power is cut off, respectively. An emergency release device for an electric shutter, characterized in that it is configured to open the shutter in normal and emergency situations using the driving force of a DC electric motor.