JPH1113361A - Air-tight device of door - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily adjust projected length of a rod in the case where a door is erected in an air-tight device for ensuring air-tightness between door and sill, ease the impact to rod and jambs caused by directly contacting the rod with the jambs in the case the door is closed, at the same time, prevent the interference of the door bottom with a floor hinge in the case a vertical pivot is used for the floor hinge and to easily ensure air-tightness around the floor hinge. SOLUTION: An air-tight device is constituted of an interlocking member directly connecting an operating member 4 corresponding to a rod coming into contact with jambs 8 in the chase a door 7 is closed and an interlocked member connected to the interlocking member. In the case the door 7 is closed, a cover for covering the operating member pushing the door bottom 2 against the door head is mounted to the door 7. An opening for storing a vertical pivot is formed near to the jambs 8 of the door bottom 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door airtightness device for ensuring airtightness between a door and a lower frame.

[0002]

2. Description of the Related Art An airtight device for ensuring airtightness between a door and a lower frame which opens and closes by rotating about a vertical axis is disclosed in Japanese Utility Model Laid-Open Nos. 55-13729 and 61-120893. No., etc., is built into the lower end of the door so as to be able to move up and down freely, and a door bottom with an airtight material laid at the lower end, a rod that contacts the vertical frame on the hanging side when closing the door and lowers the door bottom, It is composed of a spring that raises the door bottom,
In any case, since the adjustment of the length of the rod protruding from the door when opening the door is performed by turning the rod with a driver, it is difficult to operate, and when the door is closed, the rod directly contacts the vertical frame, There is a problem that impact is applied to the rod and the vertical frame at the time of contact.

In the case of a floor hinge whose vertical axis is installed in a lower frame as in Japanese Utility Model Application Laid-Open No. 61-120893, the door bottom must not interfere with the floor hinge. Therefore, the airtightness around the floor hinge cannot be ensured depending on the airtight material of the door bottom.

The present invention solves the above problem and proposes an airtight device having a form different from that of a conventional airtight device.

[0005]

According to the first aspect of the present invention, an operating member which is connected to a hanging side of a door bottom having an airtight material laid at a lower end and which comes into contact with a vertical frame of the hanging side when the door is closed is directly connected to the door bottom. By configuring the engaging member to be connected and the engaged member connected to the engaging member, by adjusting the engaging position of the engaging member and the engaged member, the protrusion length of the operating member is adjusted. Improve operability.

The engaging member has an engaging portion that engages with the engaged member. The engaged member has a tip portion that contacts the vertical frame and a plurality of engaging portions that engage with the engaging portion of the engaging member. It has an engaged portion and is connected to the engaging member so as to be movable in the width direction of the door.

The adjustment of the projecting length of the operating member is performed only by moving the engaged member with respect to the engaging member and engaging the engaging portion of the engaging member with the engaged portion at an arbitrary position. Done.

[0008] Since the engaging member and the engaged member are connected by the engagement of the engaging portion and the engaged portion, if the protruding amount of the operating member is too large, the operating member is operated when the door is closed. Even if the member is strongly pushed by the vertical frame, the engaging portion is separated from the engaged portion, so that no impact is applied to the vertical frame and the operating member.

In the second aspect, the door is connected to the hanging side of the door bottom so as to protrude from the door, and a cover for covering an operation member for pushing the door bottom toward the door tip side when the door is closed is attached to the hanging side of the door. The shock caused by the operation member directly contacting the vertical frame when the door is closed is reduced.

The cover comes into contact with the vertical frame when the door is closed by being attached to the surface on the hanging side of the door, but when the door is to be closed by covering the operating member from the vertical frame side, a portion close to the vertical frame is provided. And the operation member is gradually pressed, so that no shock is applied to the operation member and the vertical frame.

When the vertical axis is a floor hinge,
By forming an opening for accommodating the longitudinal axis near the hanging base of the door bottom as described in the above, interference between the door bottom and the floor hinge is avoided. As a result of avoiding interference, the door bottom can be provided with a length extending up to the vertical frame with the floor hinge interposed therebetween, so that an airtight material is attached to a portion of the door bottom around the floor hinge to thereby provide airtightness around the floor hinge. Can be secured.

According to a fourth aspect of the present invention, there is provided a door bottom fixed to a lower end portion of the door and supporting the airtight material so as to be able to move up and down. An air-tight device from an urging member for urging the elevating member to the hanging side, and an operating member connected to the hanging side of the elevating member, contacting the vertical frame when the door is closed, and detaching from the vertical frame when the door is opened. By forming an opening to accommodate the vertical axis in the operating member, it is possible to secure airtightness around the floor hinge while avoiding interference between the door bottom and the floor hinge when the vertical axis is a floor hinge To

According to a fourth aspect of the present invention, the actual climbing is performed except for the operation member.
Although it is common with No. 515075, actual climbing No. 2515075 cannot be applied as it is in the case where the vertical axis is a floor hinge, whereas claim 4 has an opening in the operating member, so that the vertical axis is a hinge. There is an advantage that any of the floor hinges can be handled.

When the door is closed, the operating member which is movable with the elevating member is positioned close to the vertical frame with the door bottom interposed therebetween. Therefore, if an airtight material is laid at the lower end of the operating member, the door bottom secures the door. There is also an advantage that airtightness around the floor hinge, which cannot be achieved, can be secured.

According to a fifth aspect of the present invention, a door bottom is provided at the lower end of the door so as to be able to move up and down, and an airtight material is laid at the lower end, and is installed around a floor hinge, and a recess having a relatively low level is formed at the door tip side. The airtight device is constituted by an operating member connected to the hanging base side of the door cover and the bottom of the door bottom, entering the recess of the pedestal cover when the door is closed, and detaching from the recess when the door is opened. By lowering the door bottom when entering the door and raising it when detached from the recess, without using the conventional biasing means for raising the door bottom when opening the door,
Raise and lower the door bottom as the door opens and closes.

In this case, since the operating member is always in contact with or in contact with the pedestal cover, and the door bottom is moved up and down by entering and leaving the recess, no impact is applied to the vertical frame and the door when the door is closed.

According to a sixth aspect of the present invention, a door bottom is provided at the lower end of the door so as to be able to move up and down, an airtight material is laid at the lower end, a roller pivotally supported under the door bottom, and a lower frame when the door is closed. Construct an airtight device from a rail that is laid along the airtight material of the door bottom and that the airtight material of the door bottom contacts when the door is closed, and that the roller is positioned on the lower frame when the door is closed, and the airtight material contacts the rail. Thus, the door bottom is moved up and down together with the opening and closing of the door without using the urging means as in the fifth aspect.

In this case, since the roller moves up and down the rail to move the door bottom up and down, no impact is applied to the vertical frame and the door when the door is closed.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The airtight device according to the first embodiment is shown in FIGS.
As shown in the figure, the door bottom 2 is supported at the lower end of the door 7 so as to be able to move up and down, and the lower end is provided with an airtight material 1. The door bottom 2 is connected to the door 7 and the door bottom 2 to suspend and support the door bottom 2.
It comprises a support member 3 having elasticity and an operating member 4 connected to the hanging side of the door bottom 2, which contacts the vertical frame 8 on the hanging side when the door 7 is closed, and separates from the vertical frame 8 when the door 7 is opened. Is done. The drawing shows the case of a frame door, but door 7
Is not limited to frame doors.

The door bottom 2 is composed of juxtaposed find pieces 2a, 2a and a prospect piece 2b, and the find pieces 2a, 2b on the lower surface of the prospect piece 2b.
Airtight material 1 is laid near 2a. In the drawing, the vertical axis supporting the door 7 is the floor hinge 10. Therefore, in order to avoid collision with the floor hinge 10, an opening 2c for storing the vertical axis near the vertical frame 8 of the prospective piece 2b of the door bottom 2 is provided. However, when the vertical axis is a hinge, it is not necessary to form the opening 2c.

The support member 3 is formed by bending or bending a single plate so as to have a lower end portion of the door 7, in the drawing, a piece overlapping the lower piece of the lower frame and the lower piece 2 b of the door bottom 2. The two pieces are connected to the door 7 and the door bottom 2, and an intermediate portion of the two pieces acts as a spring for returning the door bottom 2 to the original position when the door bottom 2 is lowered with respect to the door 7.

The operating member 4 is connected to the door bottom 2 as shown in FIG. 3, and includes an engaging member 5 having an engaging portion 5a and a plurality of engaged members with which the engaging portions 5a of the engaging member 5 engage. It is composed of an engaged member 6 having a portion 6a. The engaged member 6 has a tip 6b that comes into contact with the vertical frame 8, and is connected to the engaging member 5 by a screw 9 or a pin so as to be movable in the width direction of the door 7.

The insertion hole 6c of the engaged member 6 through which the screw 9 is inserted
Is long in the width direction of the door 7, and a plurality of engaged portions 6 a are arranged in the width direction of the door 7. Engaging member 5 and engaged member 6
Are connected, the engaging portion 5a is connected to one of the engaged portions 6a.
And the engaged member 6 protrudes from the engaging member 5 toward the vertical frame 8. The protruding length is reduced in the width direction of the door 7 in a state where the engaged member 6 is elastically deformed by pushing the engaged member 6 downward, and the engaging portion 5a is detached from the engaged portion 6a. This is performed by sliding the engagement member 6 and restoring it. In the drawing, a groove 6d is formed near the tip 6b so that the engaged member 6 can be pressed by a driver. The impact when the tip 6b comes into contact with the vertical frame 8 is reduced by the elastic deformation of the engaged member 6.

In the drawings, a roller is used for the tip 6b in order to reduce the resistance at the time of contact with the vertical frame 8. However, the tip 6b may be simply formed in a curved or curved shape. .

As shown in FIGS. 4 to 6, the airtight device according to the second embodiment has a door 7 in addition to the door bottom 2 and the support member 3 according to the first embodiment.
Is connected to the door bottom 2 in a state protruding from the door 7 to the hanging side, and is attached to the hanging side of the door 7 so as to cover the operating member 11 on the hanging side of the door 7 when the door 7 is closed. And a cover 12 that contacts the vertical frame 8 when the door 7 is closed.

The operating member 11 is screwed into the door bottom 2 substantially in the longitudinal direction thereof, and the tip on the vertical frame 8 side projects from the end face of the door 7 toward the vertical frame 8 side. The length of the tip of the operating member 11 protruding from the door 7 is adjusted by adjusting the length of screwing into the door bottom 2.

The cover 12 is provided on the door 7 as shown in FIG.
And cover the operation member 11 with the back surface in contact with the tip of the operation member 11 or with a clearance as shown in (b). The cover 12 contacts the vertical frame 8 to push the operating member 11 toward the door end, and lowers the door bottom 2 as shown by the dashed line in FIG. 5- (b). As a result, when the door 7 is closed, the operating member 11 is slowly pressed to lower the door bottom 2 because the door 7 is kept in contact with the vertical frame 8 from both sides in the expected direction to the center in the expected direction. When the door 7 is opened, the operation member 11 is slowly released from the vertical frame 8 and the door bottom 2 is raised.

In FIG. 5A, similarly to FIG. 2, when the vertical axis is the floor hinge 10, the vertical axis is shifted toward the vertical frame 8 of the prospective piece 2b of the door bottom 2 in order to avoid collision with the floor hinge 10. An opening 2c for accommodating therein is formed.

FIGS. 7 (a) and 7 (b) show examples for securing airtightness around the floor hinge 10 which is not secured by the airtight material 1 of the door bottom 2. FIG. (a) shows the case where the airtight material 13 is arranged between the vertical frame 8 and the floor hinge 10, and (b) shows the case where the airtight material 13 is attached to the lower end of the vertical frame of the door 7. 8a in Fig. 7- (a)
Denotes a backing plate for protecting the vertical frame 8 from collision with the operation members 4 and 11. The airtightness around the floor hinge 10 is also ensured by laying an airtight material at the lower end of the door bottom 2 near the vertical frame 8.

As shown in FIG. 8, the airtight device according to claim 4 is fixed to the lower end of the door 7 and supports the airtight material 1 so as to be able to move up and down, and reciprocates in the width direction of the door 7 with respect to the door bottom 2. An elevating member 14 that is movable and raises and lowers the airtight material 1 with reciprocation, and an urging member that urges the elevating member 14 to the hanging side.
15 and an operating member 16 connected to the hanging side of the elevating member 14 and coming into contact with the vertical frame 8 when the door 7 is closed and detaching from the vertical frame 8 when the door 7 is opened. The operation member 16 has an opening 17 for receiving the vertical axis.

The airtight material 1 is suspended and supported on the lifting member 14.
The suspension member 18 having a small rigidity is connected, and the airtight material 1 is connected to the tip of the suspension member 18. The suspension member 18 is partially forcibly bent by the guide member 19 fixed to the door bottom 2, and the lower end of the suspension member 18 is moved to the position of the guide member 19 with the movement of the lifting member 14 along the door bottom 2. The airtight material 1 moves up and down.

8 (a) shows the door 7 in the open state and FIG. 8 (b) shows the closed state. In the open state of the door 7, the lifting member 14 is suspended by the urging member 15 which is locked to the door bottom 2. The airtight material 1 is urged toward the original side and maintains the state in which the airtight material 1 has risen.
When the door 7 is closed and the operating member 16 is pushed toward the door top, the operating member 16 moves the elevating member 14 toward the door top, and the airtight material 1 descends. In FIG. 8, a part corresponding to the operation member 11 in FIGS. 4 to 6 is connected to the hanging side of the operation member 16, and this part is brought into contact with the vertical frame 8.

The opening 17 of the operating member 16 is formed in a section where the opening 17 interferes with the floor hinge 10 when it moves, so that the collision between the operating member 16 and the floor hinge 10 is avoided regardless of the opening and closing of the door 7.

In the present invention, as shown in FIG.
The airtightness around the floor hinge 10 can be ensured by laying the airtight material 20 at the lower end of the floor hinge.

The airtight device according to claim 5 is arranged at the lower end of the door 7 so as to be able to move up and down, and is installed around the door bottom 2 on which the airtight material 1 is laid at the lower end and the floor hinge 10, as shown in FIG. A pedestal cover 21 having a relatively low level recess 22 formed on the door tip side, and connected to the hanging side of the door bottom 2, enters the recess 22 of the pedestal cover 21 when the door 7 is closed, and opens when the door 7 is opened. The operation member 23 is detached from the concave portion 22. When the vertical axis is the floor hinge 10, the airtightness between the door 7 and the lower frame 25 is ensured.

According to the present invention, when the operating member 23 enters the recess 22 of the pedestal cover 21, the door bottom 2 descends and the airtight material 1 contacts the lower frame 25, and when the operating member 23 separates from the recess 22, the door bottom 2 2 rises.

FIG. 9 shows that the door bottom 2 is suspended
An example in the case of hanging and supporting is shown. The number of suspension members 24 is not limited to one. In this case, as shown by solid lines in FIGS. 9A and 9B, when the door 7 is in the closed state, the operating member 23 is
When the door bottom 2 is lowered, the airtight material 1 is in contact with the lower frame 25, and when the door 7 is open, the operating member 23 rides on a portion higher in level than the concave portion 22, as indicated by a chain line. The door bottom 2 rises. In FIG. 9, the operation member 23 has a plate shape, but the shape of the operation member 23 does not matter.

FIG. 10 shows an example in which the door bottom 2 is simply arranged in the lower end of the door 7 so as to be able to move up and down, and a roller rotating around a horizontal axis is used as the operation member 23. Also in this case, as shown by the solid line in FIGS. 10A and 10B, when the door 7 is in the closed state, the operation member 23 which is a roller is accommodated in the recess 22.
The door bottom 2 is in a lowered state, and when the door 7 is open, the operation member 23 rides on a portion higher in level than the concave portion 22 as shown by a chain line, and the door bottom 2 rises.

When the door bottom 2 rises, the level of the door bottom 2 is fixed to the protrusion 7a protruding from the inside of the door 7.
It is regulated by locking 2d.

9 and 10, since the operation member 23 always moves on the pedestal cover 21, the door bottom 2 is supported by the pedestal cover 21 regardless of whether the door 7 is opened or closed.

As shown in FIG. 12, the airtight device according to the sixth aspect is disposed at the lower end of the door 7 so as to be able to move up and down, and at the lower end a door bottom 2 on which an airtight material 1 is laid, and is pivotally supported below the door bottom 2. The door comprises a roller 26 and a rail 27 which is laid on the lower frame 25 along the airtight material 1 of the door bottom 2 when the door 7 is closed, and which comes into contact with the airtight material 1 of the door bottom 2 when the door 7 is closed. When the door is closed, the airtight material 1 comes into contact with the rail 27 to ensure airtightness between the door 7 and the lower frame 25.

In the drawing, the airtight materials 1 and 1 are laid in parallel with the door bottom 2 and the rails 27 and 27 are also arranged in parallel to ensure the stability of the roller 26 when the door 7 is closed. However, if the stability of the roller 26 can be ensured by forming a recess in the lower frame 25, etc., the airtight material 1 and the rail 27
Need not be paralleled.

The roller 26 is rotatably supported around a horizontal axis facing the width direction of the door 7 as shown in FIGS. 12 (a) and 12 (c). Shape that does not give The airtight material 1 has a flat shape in the width direction of the rail 27 so that the airtight material 1 can easily contact the rail 27 when the door 7 is closed.

According to the present invention, when the door 7 is closed,
The door bottom 2 is supported by the lower frame 25 and the floor surface because the 26 contacts the lower frame 25 and contacts the floor surface in the open state.

When the door 7 is opened and the roller 26 is in contact with the floor, the airtight material 1 is in a state of floating from the floor.
The door 7 is closed, the rollers 26 are located between the rails 27, 27 arranged in parallel, and the airtight material 1 is
Touch 27.

In the present invention, it does not matter whether the vertical axis is the floor hinge 10 or the hinge.

[0047]

According to the first aspect, an operating member connected to the hanging base of the door bottom and coming into contact with the vertical frame when the door is closed is directly connected to the door bottom, and an engaging member connected to the engaging member. It is composed of a mating member, and the protrusion length of the operation member is adjusted by adjusting the engagement position between the engagement member and the engaged member, so that the operability of the adjustment is good.

Further, since the engaging member and the engaged member are connected by the engagement of the engaging portion and the engaged portion, if the projecting amount of the operating member is too large, the engaging portion is not engaged. Since it is separated from the engaged portion, no impact is given to the vertical frame and the operation member.

According to the second aspect of the present invention, since the cover for covering the operation member for pushing the door bottom toward the door tip side when the door is closed is attached to the hanging side of the door, the impact caused by the operation member directly contacting the vertical frame when the door is closed is reduced. Can be relaxed.

In the third aspect, the opening for accommodating the vertical axis is formed near the vertical frame of the door bottom. Therefore, when the vertical axis is the floor hinge, the interference between the door bottom and the floor hinge is avoided while the vertical axis is close to the vertical frame of the door bottom. The airtightness around the floor hinge can be ensured by laying an airtight material on the floor.

According to the fourth aspect of the present invention, an opening for accommodating the vertical axis is formed in the operating member which reciprocates in the width direction of the door with respect to the door bottom, contacts the vertical frame when the door is closed, and separates from the vertical frame when the door is opened. Therefore, when the vertical axis is a floor hinge, by attaching an airtight material to the operation member while avoiding interference between the door bottom and the floor hinge, airtightness around the floor hinge that cannot be secured by the door bottom can be secured.

According to the fifth aspect, since the door bottom is raised and lowered by the pedestal cover having a relatively low level concave portion formed on the door tip side, there is no need for an urging means for raising the door bottom when the door is opened.

According to a sixth aspect of the present invention, the door bottom is moved up and down by a roller pivotally supported below the door bottom and a rail laid on the lower frame, and when the door is closed, the airtight material is brought into contact with the rail to thereby provide a space between the door and the lower frame. In order to secure the airtightness, no urging means for raising the door bottom when the door is opened is required as in the fifth aspect.

According to a fifth aspect of the present invention, the operation member is always in contact with or in contact with the pedestal cover, and the door bottom is moved up and down by entering and leaving the recess. In a sixth aspect, the roller is moved up and down the rail to move the door bottom up and down. In either case, no impact is applied to the vertical frame and the door when the door is closed.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a relationship between an airtight device and a door according to the first embodiment.

2A is a plan view showing an airtight device, FIG. 2B is a side view thereof, and FIG. 2C is an end view of FIG. 2B.

FIG. 3 is a perspective view showing a configuration example of an operation member shown in FIG. 2;

FIG. 4 is an elevation view showing a state in which the airtight device of claim 2 is attached to a door.

5 (a) is a perspective view showing the airtight device without a cover, and FIG. 5 (b) is a side view showing how the device is moved up and down.

FIG. 6A is a perspective view showing a state when a cover is attached,
(b) is a plan view showing the opening and closing of the door and the state of the cover.

FIG. 7A is a perspective view showing a state in which an airtight material is arranged between a floor hinge and a vertical frame, and FIG. 7B is a perspective view showing a state in which an airtight material is attached to a lower end of a vertical frame of a door. is there.

8 (a) is a side view showing the airtight device of claim 4 when the door is open, and FIG. 8 (b) is a side view showing the airtight device when the door is closed.

FIG. 9 (a) is a side view showing the airtight device of claim 5,
(b) is a plan view thereof.

10A is a side view showing another airtight device according to claim 5, and FIG. 10B is a plan view thereof.

FIG. 11 is a perspective view showing a pedestal cover used in FIGS. 9 and 10;

12 (a) is an elevation view showing a state in which the airtight device of claim 6 is attached to a door, FIG. 12 (b) is a plan view thereof, and FIG. 12 (c) is an end view of FIG.

[Explanation of symbols]

1 ... airtight material, 2 ... door bottom, 2a ... find piece, 2b
... Prospect piece, 2c opening, 2d locking part, 3 support member, 4 operating member, 5 engaging member, 5a engaging section, 6 engaged member , 6a ... engaged part, 6b ... tip part, 6c ... insertion hole, 6d ... groove, 7 ... door, 7a ... projection, 8 ... vertical frame, 8a ... contact plate, 9 ... ... screws, 10 ... floor hinge, 11 ... operating member, 12 ... cover, 13 ... airtight material, 14 ... elevating member, 15 ... urging member, 16 ... operating member, 17 ... opening, 18 ... hanging member, 19 ... guide member, 20
... airtight material, 21 ... pedestal cover, 22 ... recess, 23 ... operating member, 24 ... hanging member, 25 ... lower frame, 26 ... roller,
27 …… Rail.

Claims (6)

[Claims] An airtight device which is built in a lower end portion of a door that opens and closes around a vertical axis, moves up and down with opening and closing of the door, descends when the door is closed, and secures airtightness with a lower frame. A door bottom, which is supported at the lower end portion so as to be able to move up and down, and an airtight material is laid at a lower end, is connected to the door and the door bottom, and supports the door bottom, has an elastic support member, and is connected to a hanging side of the door bottom, An operating member that contacts the vertical frame on the hanging side when the door is closed and separates from the vertical frame when the door is opened; the operating member is connected to the door bottom and has an engaging member having an engaging portion; The engaging member has a plurality of engaged portions to be engaged with the engaging portion of the mating member and an engaged member which has a tip portion in contact with the vertical frame and is movably connected to the engaging member in the width direction of the door. Door airtightness. 2. An airtight device which is built into a lower end of a door which opens and closes around a vertical axis, moves up and down with opening and closing of the door, descends when the door is closed, and secures airtightness with a lower frame. A door bottom supported at the lower end of the door so as to be able to move up and down and an airtight material is laid at a lower end, a support member having elasticity connected to the door and the door bottom and suspending and supporting the door bottom, and protruding from the door at the hanging side of the door bottom. Connected in a state where
An operating member that pushes the door bottom toward the door tip when the door is closed,
It is attached to the hanging side of the door so as to cover the operation member,
An airtight door device consisting of a cover that contacts the vertical frame on the hanging side when the door is closed. 3. An opening for accommodating the longitudinal axis is formed near the hanging base of the door bottom.
An airtightness device for a door according to claim 1. 4. An airtight device built in a lower end portion of a door that opens and closes around a vertical axis, moves up and down with opening and closing of the door, descends when the door is closed, and secures airtightness with a lower frame. A door bottom fixed to the lower end of the door and supporting the airtight material in an ascending and descending manner, an elevating member capable of reciprocating in the width direction of the door with respect to the door bottom, and elevating and lowering the airtight material with reciprocation, and moving the elevating member to the hanging side. An operating member that is connected to the hanging side of the lifting member and that is in contact with the vertical frame on the hanging side when the door is closed, and detaches from the vertical frame when the door is opened, An airtight device for a door in which an opening for accommodating the vertical axis is formed. 5. An airtight device built in a lower end portion of a door that opens and closes around a floor hinge, moves up and down with opening and closing of the door, descends when the door is closed, and secures airtightness with a lower frame. A door bottom that is disposed at the lower end of the door so as to be able to move up and down, an airtight material is laid at the lower end, a pedestal cover that is installed around the floor hinge, and a relatively low-level recess is formed on the door tip side, and a door bottom. An airtight device for a door, comprising an operating member connected to the hanging side, which enters into the recess of the pedestal cover when the door is closed, and comes off from the recess when the door is opened. 6. An airtight device built in a lower end portion of a door that opens and closes around a vertical axis, moves up and down with opening and closing of the door, descends when the door is closed, and secures airtightness with a lower frame. A door bottom, which is disposed at the lower end of the door so as to be able to move up and down, and an airtight material is laid at the lower end, a roller pivotally supported below the door bottom, and a lower frame, laid along the airtight material of the door bottom when the door is closed. A door airtight device comprising a rail that comes into contact with an airtight material at the door bottom when the door is closed.