JPS5942791B2 - door sealing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sealing device for a swinging door such as a smoke-proof and fire-proof door and a door frame.

The smoke-blocking structure of conventional smoke- and fire-proof doors is such that a groove is provided along the width direction on the lower end surface of the door facing the lower door frame, and a pantograph-like mechanism connected to an interlocking device on the door hanging side is installed in the core groove. It is known that a vertically movable gap blocking member is attached through the mechanism, and the gap blocking member is activated according to the opening and closing of the door, but the mechanism is complex and often fails, requiring timing adjustment with the interlocking device. Therefore, the function lacks reliability, and the door opening/closing resistance requires a large force to open and close the dog door in order to drive the interlocking device.

The present invention eliminates the above-mentioned drawbacks and provides a smoke-shielding structure that has a simple structure, is free from failure, has a reliable smoke-shielding effect, and is easy to operate when opening and closing the door.

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

The outline of this embodiment is that a magnet as a frame-side magnetic material is built into the door frame, a gap shielding member that can freely appear and retract is provided on the door outer layer facing the magnet, and the door-side magnetic material is attached to the shielding member. The gap shielding member and the door-side magnetic body are urged toward the door via a spring.

The door frame 3 is made of a non-magnetic material such as stainless steel and has a groove-shaped steel shape, and is arranged with its web portion facing the end surface of the door 1.

The outer lower surface of the lower frame 3a of the door frame 3 has two built-in magnets 4 with different polarities on the attracting surfaces. The entrance doors 1, which are buried in the floor 5 at intervals in the horizontal direction, can be opened and closed by hinges and other fittings on the door frame 3 fixed to the entrance of the partition wall 2, and have face plates 1a on both sides. A groove-shaped steel door support frame 1b with its flange portion facing the door frame 3 is fixed between the double-sided plates 1a on the upper, lower, and both side end faces of the door to form a groove along the length of the end face. .

A gap shielding member 6 having a groove-shaped steel cross section and facing the door tension rib 1b is fitted into the groove of the door tension rib 1b so as to be slidable in the depth direction of the groove while keeping the flange portions of the two in close contact with each other. There is.

A door-side magnetic body 7 made of steel or the like having a rectangular cross section is attached to the bottom of the groove of the gap shielding member 6 and facing both of the two magnets 4 .

These gap shielding members 6 and the door side magnetic body 7 are penetrated in the vertical direction, and an adjustment hole 8 is located at a position corresponding to the gap between both magnets 4.
is provided.

Tension coil springs 9 are attached to these adjustment holes 8.

That is, the spring 9 has a cylindrical coil shape with a small diameter part at the upper end and a large diameter part at the lower end, and the adjustment hole 8 has a large diameter on the lower side on the door side magnetic body 7 side and a large diameter on the upper side so that the adjustment hole 8 can fit the spring 9. It consists of a stepped circular upper hole 7a with a smaller diameter on the side and a lower hole 6a of the same size as the large diameter hole provided on the gap shielding member 6 side.

A spring 9 is fitted into the adjustment hole 8 between the groove bottom of the door support rib 1b and the gap shielding member 6, and a screw 10 is provided that allows the small diameter end of the spring 9 to move forward and backward into the web portion of the door support rib 1b. The gap shielding member 6 is screwed and supported via the spacer 11, and biased so as to sink into the groove side of the door.

As a result, the gap shielding member 6 is installed at the same time as the spring 9 is installed on the door 1, making installation and removal easy, and the spring force can be easily adjusted by adjusting the selection screw 10. Adjustment can be made freely after the interlocking shielding member 6 is attached.

Further, the door frame 3 has a simple shape, has no convex surface on the outside, and has a large opening, so that there is no chance of tripping when walking on the floor.

As the spacer 11, a low melting point material such as a fuse is used.

Further, of the two divided magnets 4, one (the left side in FIG. 2) has an S-pole attracting surface, and the other (the right-hand side in FIG. 2) has an N-pole attracting surface.

Next, the operating state will be explained.

When the door 1 is closed, the lower end surface of the door stops above and parallel to the lower door frame 3a.

Therefore, an annular magnetic field as shown by the dotted line A is formed between the frame side magnet 4 and the door side magnetic body 7 via the lower plume 3a and the gap shielding member 6, and the door side magnetic body 1 resists the spring 9 and the magnet 4 As a result, the gap shielding member 6 descends while maintaining close contact with the door frame 1b and comes into close contact with the lower frame door 3a.

When the magnetism of the magnet 4 disappears due to the heating of the flame while the door is closed, the spacer 11 melts and disappears, so even if the spring 11 restores itself, it descends and the gap shielding member 6 is caused by its own weight. It is maintained in close contact with the descending portion 3a.

When the door 1 is opened, the door-side magnetic body 7 moves away in a direction parallel to the attraction surface of the magnet 4, so that the attraction is released with a slight force.

When the magnet 4 and the door-side magnetic body 7 separate, the attraction force rapidly decreases in inverse proportion to the square of the distance, so the gap shielding member 6 is pulled together with the movable magnetic body 7 by the restoring force proportional to the displacement of the coil spring 9. When lifted, there is a suitable gap between the floor 5 and the lower surface of the door 1, so that the door does not rub against the floor surface.

In addition, since the shielding member 6 slides on the upper surface of the lower frame 3a when the door is opened and closed,
It has the effect of removing foreign matter from the top surface of the bottom frame.

The coil spring 9 can be attached and detached from the adjustment hole 8 through the screw 10, and a screwdriver is inserted through this hole and the screw 10 is inserted.
can be operated to adjust the elastic force of the spring 9 when the door is closed, and at the same time, the height of the lower end surface of the door can be adjusted.

The spring 9 may be formed into a coil shape with a downwardly widened shape instead of the same cylindrical coil shape of the above embodiment.

The repeated explosion sealing structure of the present invention can be used by increasing or decreasing the number of magnets attached according to the size of the door, and by freely selecting sizes of magnets.

Even if all kinds of mounting hardware such as hinges, pivot hinges, floor hinges, auto hinges, etc. are used for mounting the door, the above operating condition will not change.

In addition to being attached to the lower end surface of the door as shown in the above embodiment, the device of the present invention can also be applied to the upper surface or both sides of the door as necessary.

Further, the movable magnetic body on the gap shielding member side may be a magnet, and the fixed magnetic body on the door frame side may be the attracted magnetic body, or both may be magnets.

The magnet is not limited to the above embodiment, and the polarity of the two attracting surfaces may be reversed or the same, and the polarity of the two attracting surfaces may be reversed or the same, and one or three magnets may be used.
Of course, the number may be more than one.

The present invention includes a gap shielding member that is retractably inserted into the groove of the end face of the door, and a magnetic material is provided on both the shielding member and the door frame so that at least one of them is a magnet, and Since the shielding member is biased toward the door by the spring, the door cannot be opened in a direction parallel to the attracting surface of the magnet, and the door can be opened with a slight force, and once opened. The magnetic attraction force to the door rapidly decreases, the shielding member is lifted by the spring, and the door opens extremely smoothly. This is a very important effect provided by smoke and fire doors.

In addition, the gap shielding member is biased toward the door by a spring, and the end of the small diameter portion of the spring is screwed and supported by the door through a spacer, which is a low-melting point material, so that it can move forward and backward. The shielding member can be easily attached and removed, and the spring force can be freely and easily adjusted after the gap shielding member is attached.

Furthermore, when the magnetism of the magnet disappears due to the heating of the flame while the door is closed, the spacer melts and the gap shielding member is kept in close contact with the lower frame due to its own weight, and the sealing is maintained as it is.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a longitudinal sectional side view of one embodiment of the present invention, and FIG.
It is a sectional view taken along ■-■ in the figure. 1...Door, 1b...Door strength bone, 2...
...Partition wall, 3...Door frame, 3a...
・Bottom frame, 4... Melting method, 5... Floor, 6.
... Gap shielding member, 7 ... Door side magnetic material,
9... Coil spring, 10... Screw, 1
1...Spacer.

Claims (1)

[Claims] 1. A frame-side magnetic material is built into the door frame, and a groove is formed along the length of the door by arranging the door tension rib on the end face of the door facing the door frame, and a gap is secured within the groove. A shielding member is inserted and retracted freely, a door-side magnetic body is attached to the side of the gap shielding member facing the groove bottom, and at least one of the frame-side and door-side magnetic bodies is used as a magnet, and the groove bottom and the gap shield are attached. A spring that biases the shielding member toward the groove bottom is interposed between the spring and the member, and the small diameter end of the spring can move forward and backward with a screw against the web portion of the door force bone through a spacer made of a low melting point material. A door sealing device characterized by being screwed and supported by.