JPS589962Y2 - door holding device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a door holding device that can hold a door in an open or closed state.

Conventionally, such a device has been proposed in Japanese Utility Model Application Publication No. 52-104262, in which a ferromagnetic suction plate is attached to a fire door, and a permanent magnet is placed on the opposite side of the building and the magnetic force of this permanent magnet is applied. The electromagnet is normally demagnetized and the magnetic force of the permanent magnet attracts the adsorption plate of the door to hold the door, and in case of an emergency, the electromagnet is energized to cancel out the adsorption force of the permanent magnet. , there is one that eliminates the holding force of the door.

However, in this design, there is a risk that in the event of an emergency such as a fire, the electromagnet will not be energized due to breakage of the electromagnet wiring, and the electromagnet will not be able to perform the above-mentioned holding force canceling action. If the electromagnet is constantly energized to hold the door without using it, and in an emergency the electromagnet is demagnetized to release the holding force, the power consumption would be large and it would be impractical.

In order to solve the above-mentioned drawbacks, the present invention uses a permanent magnet and a fluid pressure cylinder in combination, and applies a holding force by the magnetic force of the permanent magnet, and releases this by the output of the fluid pressure cylinder.

The configuration and operation of the present invention will be explained with reference to an example of its implementation.

FIG. 1 is a plan view showing the arrangement of the building and the doors when an example of implementation is applied to the fire doors, where a (solid line) shows the fire doors that are always held in the open position; It is a revolving door centered on the shaft.

C is a passage, and in the event of a fire, it is closed by a fire door as shown by a' (dashed line).

d is a wall on the side of the building, and a door holding device f is provided at a position facing the magnetic adsorption plate e attached to the fire door a in the open state.

FIG. 2 is a front view of the door holding device f as seen in the direction of arrow E in FIG. 1, and FIGS.
It is a sectional view taken along the B' line.

As described above, a door holding device f is built into a recess provided on the building side facing the adsorption plate e made of magnetic material attached to a portion of the fire door a.

Reference numeral 1 denotes an annular permanent magnet, which is held by a magnet mounting member 2. A switch actuator 3 is loosely fitted into the center hole of the permanent magnet 1, and is constantly pressed toward the permanent magnet 1 by a spring 4.

The outer diameter of the switch actuator 3 is the large diameter part 3 as shown in the figure.
a, a medium diameter portion 3b, and a small diameter portion 3C have a stepped shape, and the outer peripheral surfaces of the large diameter portion 3a and the medium diameter portion 3b form a contact surface of the contact roller 5a of the limit switch 5.

6 is a piston shaft whose one end is fitted into the inner hole of the switch actuator 3, and the piston 7 attached to the other end is slidably fitted into the cylinder hole 9 of the pneumatic cylinder 8 of the door holding device f. It matches.

Reference numeral 10 denotes a spring that constantly presses the piston 7 in the right direction in the figure.

The cylinder chamber 11 has a supply/discharge hole 13. The piping 14 communicates with a pressure air source (not shown) via an electromagnetic switching valve (not shown), and the cylinder chamber 12 communicates with the atmosphere through a filtered port 15.

Reference numeral 16 denotes a protective case that is fitted into and secured to a recess on the building side, and as shown in FIG. 4, a mounting plate 17. Adjustment screw 20° adjustment spring 21. The pneumatic cylinder 8 is connected via the cylinder mounting plate 22, and the permanent magnet 1 is connected via the mounting member 2.
The front and rear positions can be adjusted freely.

23 is a decorative board.

5b and 5C are terminals of the switch 5, and the conductor 19
is connected to a warning device (not shown) in the central monitoring room.

Next, the operation of this embodiment will be explained.

Compressed air from a compressed air source (not shown) is routed through a solenoid valve (not shown) to piping 14. When supplied to the cylinder chamber 11 through the supply/discharge hole 13, the piston 7 and piston shaft 6 move to the left against the spring 10, and the tip 6a of the piston shaft 6 leaves the inner bottom surface of the switch actuator 3.

However, the switch actuator 3 remains pressed by the spring 4 and protrudes from the outer surface of the permanent magnet 1 as shown.

Now, when the door a is manually opened and pushed against the building d side, the magnetic adsorption plate e attached to the door comes into contact with the switch actuator 3, compresses the spring 4, and pushes the tip of the switch actuator 3 into the permanent magnet 1. , the inner bottom surface of the switch actuator 3 reaches a position where it almost contacts the tip 6a of the piston shaft, that is, the tip surface of the switch actuator 3 reaches a position on the same plane as the surface that the magnetic adsorption plate e of the permanent magnet 1 contacts, The magnetic attraction plate e is attracted to the permanent magnet 1.

The door a is therefore held in its open position, and the contact roller 5a of the switch 5
The connection between the terminals 5b and 5C is broken, and a signal indicating that the door is held open is transmitted to the central monitoring room via the conductor 19.

In this state, if a person pulls the door 1 away against the attraction force of the permanent magnet, closes it, and then returns it to the open position, the permanent magnet acts again to keep the door open.

In the event of a fire, smoke detectors and other detection devices will
Automatically or by a command from the central monitoring room, an electromagnetic switching valve (not shown) provided in the middle of the piping 14 is switched to the discharge side, and the compressed air in the cylinder chamber 11 is transferred to the supply/discharge hole 13. It is discharged from the electromagnetic switching valve via the pipe 14.

Therefore, the piston 7 is moved to the right by the tension of the spring 10, and the piston shaft 6 is moved to the right together with the switch actuator 3, pushing out the adsorption plate e and separating it from the permanent magnet 1 to reach the position shown in the figure.

At this position, the attraction force of the magnet has almost no effect, so
The door holding force is released and the door a is automatically closed by a door closer (automatic door closing device) or the like, and functions as a fire door such as preventing the spread of fire and movement of smoke.

The contact roller 5a of the switch 5 rides on the outer circumferential surface of the large diameter portion 3a of the switch actuator 3 and contacts the terminal 5 of the switch 5.
B and 5C are connected to send electrical signals to the central monitoring room,
Informs you that the door is closed.

Even if a person opens the door after it has been closed, the door holding force has been released, so it will not be held in the open position, and if the door is released, it will be closed again by a door closer or the like.

In other words, in the event of a fire, the door will always be in the closed position and will be automatically closed even if a person leaves the door open and evacuates.

In the embodiment of the present invention, compressed air is stored in the cylinder during normal times, and is discharged in an emergency to operate the piston. Therefore, in the event of an emergency, if the piping 14 is damaged on the way and the compressed air is Once released, the piston 7 is automatically actuated to close the fire door.

In addition, if the electromagnetic switching valve is switched to the discharge side when demagnetizing, it will be energized and energized when the door is held, and will be demagnetized and closed when the energization is stopped, such as during a power outage that is likely to occur in an emergency. (In this case, if one electromagnetic switching valve is used to control a large number of door holding devices f, power consumption can be reduced.) It can be said that it has the necessary conditions as a disaster prevention device.

Due to the above-described configuration and operation, the present invention has the following effects.

(1) Since the present invention utilizes fluid pressure, the required operation is possible even during a power outage.

(2) As mentioned above, the present invention is highly safe as a disaster prevention device in case of an emergency.

In the conventional example, there is a risk of inoperability due to breakage of the electromagnet wiring.

Although the above embodiment shows an example of use in a rotating fire door, it can also be used as a door holding device for a sliding door, and can also be used not only for fire doors but also as a locking device for windows, boxes, etc. can.

[Brief explanation of drawings]

Fig. 1 is a plan view showing the layout of a fire door using an embodiment of the present invention, Fig. 2 is a front view of the embodiment, and Fig. 3 is a sectional view taken along the line A-A' in Fig. 2. , Figure 4 shows the same B-B'
FIG. 1...Permanent magnet, 3...Switch actuator, 5...Switch, 6...
Piston shaft, 7... Piston, 8...
Cylinder, 9...Cylinder hole, 11...
・Cylinder chamber, 13... Suction and exhaust hole, 14...
...Piping, a...Door, d...Wall, e...
...Magnetic adsorption plate, f...Door holding device.

Claims (1)

[Scope of utility model registration request] A magnetic adsorption plate provided on either the door side or the building side,
A permanent magnet is attached to the other side facing this, and the piston shaft is attached to the building side and is normally supplied with pressure fluid to draw the piston shaft from the attraction surface of the permanent magnet or attraction plate, and by discharging the pressure fluid, A door holding device comprising a fluid pressure cylinder that pushes out a piston shaft from the suction surface.