JP2024067690A - Airtight material and fitting - Google Patents

Abstract

To improve fire retardant property.SOLUTION: An airtight material 30 is applied to a fitting having a frame body and a surface material installed on the frame body and has a base part 31 to be attached to the frame body or the surface material and an abutting part 32 to be abutted against the frame body or the surface material. The base part 31 and the abutting part 32 are formed of thermally expansible member. The airtight material has parts having expansion start temperatures different from each other.SELECTED DRAWING: Figure 3

Description

The present invention relates to airtight materials and building materials.

In order to improve the fire resistance of building materials, airtight materials are provided that are placed between the frame and a surface material such as a shoji screen, with the base molded from a thermally expandable material. Building materials fitted with such airtight materials expand when exposed to high temperatures in the event of a fire, etc., and it becomes possible to prevent the occurrence of gaps between the frame and the surface material that could allow flames to penetrate (see, for example, Patent Document 1).

JP 2019-199956 A

However, when building materials are exposed to high temperatures, the facing material may thermally deform so that it curves relative to the frame. When thermal deformation occurs in the facing material in this way, the gap between the facing material and the frame increases, raising concerns that flames may penetrate the material if the base of the airtight material expands.

In view of the above, the present invention aims to provide airtight materials and fittings that can improve fire resistance.

In order to achieve the above object, the airtight material of the present invention is an airtight material applied to a fitting having a frame body and a surface material arranged on the frame body, and is characterized in that it has a base part attached to the frame body or the surface material and an abutment part abutting the frame body or the surface material, both of which are molded from a thermally expandable material and have parts with mutually different expansion start temperatures.

According to the present invention, when exposed to high temperatures during a fire or the like, both the base and the abutting parts of the airtight material will expand. Therefore, even if the facing material is thermally deformed so as to curve relative to the frame body, it is possible to prevent gaps from occurring, and improve fire resistance. Furthermore, since there are parts with different expansion start temperatures, the thermally expandable member will expand at different times. Therefore, for example, even if a gap between the frame body and the facing material expands or a new gap occurs after the thermally expandable member expands at a relatively low temperature, there is an advantage in that it is possible to seal this gap with the thermally expandable member that expands at a relatively high temperature.

FIG. 1 is a vertical cross-sectional view of a fixture according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of the fixture shown in FIG. 1 . FIG. 2 is an end view of the airtight material applied to the fitting shown in FIG. 1 . 2A is a cross-sectional view of the essential parts of the fixture shown in FIG. 1 when the panel is placed in a closed position relative to the frame body, FIG. 2B is a cross-sectional view of the essential parts when the base of the airtight material is expanded, and FIG. 2C is a cross-sectional view of the essential parts when the abutment portion of the airtight material is further expanded. FIG. 5 is a vertical cross-sectional view of a fitting according to a second embodiment of the present invention. FIG. 6 is a cross-sectional view of the fixture shown in FIG. 5 . FIG. 11 is a vertical cross-sectional view of a fitting according to a third embodiment of the present invention. FIG. 8 is a cross-sectional view of the fixture shown in FIG. 7 . FIG. 11 is a vertical cross-sectional view of a fitting according to a fourth embodiment of the present invention. FIG. 10 is a cross-sectional view of the fixture shown in FIG. 1A shows an end view of modified configuration of an airtight material, FIG. 1B shows an end view of modified configuration of a second embodiment, and FIG. 1C shows an end view of modified configuration of a third embodiment. 1A and 1B show modified configurations of the airtight material, with FIG. 1A being an end view of modified configuration 4 and FIG. 1B being an end view of modified configuration 5. FIG. 2 is an end view showing a first modified shape of the airtight material. FIG. 2 is an end view showing a second modified shape of the airtight material. FIG. 4 is an end view showing a third modified shape of the airtight material. FIG. 4 is an end view showing a fourth modified shape of the airtight material. FIG. 5 is an end view showing a modified shape of the airtight material. FIG. 6 is an end view showing a modified shape 6 of the airtight material. FIG. 7 is an end view showing a modified shape of the airtight material.

Below, a detailed description of preferred embodiments of the airtight material and fittings according to the present invention will be given with reference to the attached drawings. For convenience, the terms "prospect direction" and "visible direction" may be used below. The "prospect direction" is the direction along the depth of the fittings, as shown by arrow A in the figure. A surface along the prospective direction may be referred to as a "prospect surface." The "visible direction" is the direction perpendicular to the prospective direction for items that extend horizontally, such as a sill frame. For items that extend vertically, such as a vertical frame, the horizontal direction perpendicular to the prospective direction is called the "visible direction." A surface along the prospective direction may be called a "visible surface."

(Embodiment 1)
1 and 2 show a fitting according to a first embodiment of the present invention. The fitting exemplified here is called a hinged window, which comprises a frame 10 and a shoji (surface material) 20. This fitting has a link mechanism (not shown) between the frame 10 and the shoji 20, and can open the shoji 20 relative to the frame 10 so that it protrudes toward the outside. The frame 10 is constructed by assembling left and right vertical frames 11 and 12, an upper frame 13, and a lower frame 14 around the four sides. The shoji 20 is constructed by comprising a surface material 21 such as a rectangular double-glazed glass, and left and right vertical frames 22 and 23, an upper frame 24, and a lower frame 25 arranged around the four sides of the surface material 21. The vertical frames 11, 12, the upper frame 13, and the lower frame 14 are provided with exterior door contact sight surfaces 11a, 12a, 13a, and 14a and interior door contact sight surfaces 11b, 12b, 13b, and 14b on their respective inner peripheral portions. The exterior door contact sight surfaces 11a, 12a, 13a, and 14a extend along the sight direction on the parts of the vertical frames 11, 12, the upper frame 13, and the lower frame 14 that are located on the exterior side of the room. The interior door contact sight surfaces 11b, 12b, 13b, and 14b extend along the sight direction on the parts of the vertical frames 11, 12, the upper frame 13, and the lower frame 14 that are located on the interior side of the room, and are provided on the inner peripheral portion of the exterior door contact sight surfaces 11a, 12a, 13a, and 14a. The dimensions of these inner door abutment sight surfaces are set so that their respective exterior facing sight surfaces can simultaneously face the vertical frames 22, 23, upper frame 24, and lower frame 25 of the shoji screen 20. Furthermore, the vertical frames 22, 23, upper frame 24, and lower frame 25 are provided with abutment fins 22a, 23a, 24a, and 25a on the portions located on the exterior side of the room. The abutment fins 22a, 23a, 24a, and 25a extend toward the outer periphery. The dimensions of these abutment fins 22a, 23a, 24a, and 25a are set so that their respective exterior facing sight surfaces can simultaneously face the outer door abutment sight surfaces 11a, 12a, 13a, and 14a. The vertical frames 11, 12, upper frame 13, and lower frame 14 that constitute the frame body 10, and the vertical frames 22, 23, upper frame 24, and lower frame 25 that constitute the shoji screen 20 are all extruded shapes made of metal such as aluminum or resin, and are each configured to have a cross-sectional shape that is approximately uniform along their entire longitudinal length.

As is clear from the figure, an airtight material 30 is provided between the frame body 10 and the shoji screen 20. The airtight material 30 is intended to ensure airtightness between the frame body 10 and the shoji screen 20 when the shoji screen 20 is placed in a closed position relative to the frame body 10. In this embodiment 1, a dovetail-shaped mounting portion 15 is provided on each of the exterior door contact visible surfaces 11a, 12a, 13a, 14a and the interior door contact visible surfaces 11b, 12b, 13b, 14b facing the outside, and an airtight material 30 is attached to each mounting portion 15. The airtight material 30 has a base 31 and an abutment portion 32, and is attached to each mounting portion 15 via the base 31. Each airtight material 30 is provided continuously over the entire length of the vertical frames 11, 12, upper frame 13, and lower frame 14 along the longitudinal direction. When the shoji screen 20 is placed in the closed position, the abutment parts 32 of each airtight material 30 abut against the visible surface of the shoji screen 20 facing the room and the visible surfaces of the abutment fin parts 22a, 23a, 24a, and 25a facing the room, thereby ensuring airtightness between the frame body 10 and the shoji screen 20 both indoors and outdoors.

The specific configuration of the airtight material 30 will be described in detail below, along with a description of the characteristic parts of the present invention. Figure 3 shows the airtight material 30 to which the above-mentioned fittings are applied. The base 31 of the airtight material 30 is a part that is attached to the mounting part 15 provided on the frame body 10, and has a base body 31a, a protrusion 31b, and a bulge 31c. The base body 31a is substantially flat and is formed with a width that can cover the opening of the mounting part 15. The protrusion 31b protrudes from a part that is substantially the center in the width direction on one surface of the base body 31a, and is formed with a width that can be inserted into the opening of the mounting part 15. The bulge 31c is flat and extends in the width direction from the protruding edge of the protrusion 31b. The base 31 of this airtight material 30 is attached to the mounting part 15 by pressing the bulge 31c and the protrusion 31b through the opening, with the base body 31a covering the opening of the mounting part 15. The abutment part 32 of the airtight material 30 is fin-shaped and extends at an angle from one end edge of the base body 31a, and the extended edge abuts in an elastically deformed state against the shoji screen 20 to be airtight.

In this embodiment 1, the base 31 and the contact portion 32 of the airtight material 30 are integrally formed from a thermally expandable material. The thermally expandable material is a non-flammable or flame-retardant fire-resistant material that expands due to heat. The thermally expandable material is, for example, a material formed by incorporating thermally expandable graphite into a base material made of resin, rubber, or elastomer, or a base material made of a combination of resin, rubber, and elastomer. However, the base 31 is adjusted so that the set temperature at which it starts to expand is higher than that of the contact portion 32. The specific set temperature at which it starts to expand can be adjusted arbitrarily, and the specific temperature difference between the two can be set appropriately.

According to the fittings equipped with the airtight material 30 configured as described above, as shown in Figs. 1, 2, and 4(a), the airtight material 30 is interposed between the frame body 10 and the shoji screen 20, so that it is possible to prevent the outside air and water from entering the room. Moreover, since the airtight material 30 is made of a thermally expandable material, as shown in Figs. 4(b) and 4(c), when the fittings are exposed to high temperatures in the event of a fire, the airtight material 30 will expand. This makes it possible to prevent a flame from penetrating between the frame body 10 and the shoji screen 20, which is advantageous in terms of fire resistance. In particular, according to the above-mentioned airtight material 30, since both the base 31 and the abutment portion 32 are formed from a thermally expandable material, it is possible to prevent a gap from being generated even when the shoji screen 20 is thermally deformed so as to be curved relative to the frame body 10, and it is possible to further improve the fire resistance of the fittings. Furthermore, because the base 31 and the abutment 32 have different expansion start temperatures, specifically, the base 31 begins to expand after the abutment 32 expands, even if the gap between the frame 10 and the screen 20 widens or a new gap appears after the abutment 32 expands, the base 31 can then expand to close the gap, providing great fire resistance.

In the above-mentioned embodiment 1, a hinged window is used as an example of a fixture, but there are no restrictions on the type of window as long as the door opens and closes relative to the frame. For example, it may be applied to a sliding window as in the embodiment 2 shown below, or it may be applied to a fixed window as in the embodiment 3.

(Embodiment 2)
5 and 6 show a fitting according to the second embodiment of the present invention. The fitting shown here is called a sliding window, and is composed of a frame 40, an outer screen (surface material) 50A arranged on the outside of the frame 40, and an inner screen (surface material) 50B arranged on the inside of the frame 40.

The frame body 40 is constructed by assembling the left and right vertical frames 41, 42, the upper frame 43, and the lower frame 44 around the four sides. The upper frame 43 and the lower frame 44 are provided with outer horizontal guide rails 43a, 44a and inner horizontal guide rails 43b, 44b, and the left and right vertical frames 41, 42 are provided with outer vertical guide rails 41a and inner vertical guide rails 42a. The outer horizontal guide rails 43a, 44a and inner horizontal guide rails 43b, 44b are formed on the facing surfaces of the upper frame 43 and the lower frame 44 at positions that are the outside and inside of the room, respectively, and are provided so as to be parallel to each other over almost the entire length of the upper frame 43 and the lower frame 44. The outer vertical guide rails 41a and inner vertical guide rails 42a are formed on the facing surfaces of the left and right vertical frames 41, 42, and are formed on the entire length of the vertical frames 41, 42. In this embodiment 2, only the outer vertical guide rail 41a is provided on the vertical frame 41 located on the left side as viewed from the inside of the room, and only the inner vertical guide rail 42a is provided on the vertical frame 42 located on the right side as viewed from the inside of the room.

The outer screen 50A is configured with a rectangular panel 51 such as laminated glass, and left and right vertical frames 52, 53, an upper frame 54, and a lower frame 55 arranged around the four sides of the panel 51, while the inner screen 50B is configured with a rectangular panel 51 and left and right vertical frames 52, 53, an upper frame 54, and a lower frame 55 arranged around the four sides of the panel 51. The outer screen 50A and the inner screen 50B are movably arranged on the frame body 40 via the outer horizontal guide rails 43a, 44a and the inner horizontal guide rails 43b, 44b, and are capable of opening and closing the opening of the frame body 40. That is, although not shown in the figure, a door roller is provided on the lower frame 55 of the door screens 50A, 50B, and the door roller is placed on the outer horizontal guide rail 44a and the inner horizontal guide rail 44b of the lower frame 44, and the outer horizontal guide rail 43a and the inner horizontal guide rail 43b of the upper frame 43 are arranged between the fin portions 54a provided on the upper frame 54, thereby making it possible to move the door screens 50A, 50B to open and close relative to the frame body 40. In this embodiment 2, the frame body 40 and the two door screens 50A, 50B are configured so that when the outer door screen 50A is arranged on the left side of the frame body 40 and the inner door screen 50B is arranged on the right side when viewed from the inside of the room, the opening of the frame body 40 can be closed. When the outer screen 50A and the inner screen 50B are arranged in the closed position relative to the frame body 40, the vertical frame 53 located on the right side of the outer screen 50A and the vertical frame 52 located on the left side of the inner screen 50B are aligned with each other in the forward direction when viewed from the inside of the room. Also, when the outer screen 50A and the inner screen 50B are arranged in the closed position relative to the frame body 40, the outer vertical guide rail 41a is arranged between the fin portions 52a provided on the vertical frame 52 that forms the door end of the outer screen 50A, and the inner vertical guide rail 42a is arranged between the fin portions 53a provided on the vertical frame 53 that forms the door end of the inner screen 50B. The vertical frames 41, 42, upper frame 43, and lower frame 44 that make up the frame body 40, and the vertical frames 52, 53, upper frame 54, and lower frame 55 that make up the shoji screens 50A and 50B, are all extruded shapes made of metal such as aluminum or resin, and are each configured to have a cross-sectional shape that is approximately uniform over the entire length along the longitudinal direction.

As is clear from the figure, this fitting has airtight material 30 similar to that of embodiment 1 provided between the frame 40 and the outer and inner screens 50A and 50B, and between the outer and inner screens 50A and 50B. More specifically, airtight material 30 is provided on the fins 54a, 55a, and 52a provided on the outside of the upper and lower frames 54 and 55 of the outer screen 50A, and airtight material 30 is provided on the fins 54a, 55a, and 52a provided on the outside of the upper and lower frames 54 and 55 of the inner screen 50B, and airtight material 30 is provided on the fins 54a, 55a, and 53a provided on the outside of the upper and lower frames 54 and 53 of the inner screen 50B. The airtight material 30 is attached via a base 31 to the dovetail-shaped mounting portions 56 provided on the respective fins 52a, 53a, 54a, and 55a. The airtight material 30 provided on the upper frame 54 and the lower frame 55 functions to ensure airtightness between the interior and exterior of the frame 40 and the shoji screens 50A, 50B by the extended edge of the abutment portion 32 abutting against the outer horizontal guide rails 43a, 44a and the inner horizontal guide rails 43b, 44b. Each airtight material 30 is provided continuously over the entire length of the upper frame 54, the lower frame 55, and the vertical frames 52, 53. Furthermore, the airtight material 30 is provided on the outer shoji screen 50A via a dovetail-shaped mounting portion 56 over the entire length of the visible surface of the vertical frame 53 that meets the door. This airtight material 30 functions to ensure airtightness between the exterior and interior of the room between the exterior screen 50A and the interior screen 50B by abutting the abutting portion 32 against the exterior facing surface of the vertical frame 52 that joins the interior screen 50B when the exterior screen 50A and the interior screen 50B are placed in the closed position.

In the fittings of this embodiment 2, airtight material 30 is interposed between the frame body 40 and each of the shoji screens 50A, 50B and between the shoji screens 50A, 50B, so it is possible to prevent outside air and water from entering the room. Moreover, since the airtight material 30 is made of a thermally expandable material, both the base 31 and the abutment part 32 of the airtight material 30 will expand when the fittings are exposed to high temperatures in the event of a fire, etc., so it is possible to more reliably prevent a situation in which a flame penetration hole occurs between the frame body 40 and the shoji screens 50A, 50B and between the shoji screens 50A, 50B. Furthermore, because the base 31 begins to expand after the contact portion 32 expands, even if gaps between the frame 40 and the screens 50A, 50B or between the screens 50A, 50B expand or new gaps appear after the contact portion 32 expands, the base 31 can then expand to close the gaps, providing an excellent fire protection advantage.

(Embodiment 3)
7 and 8 show a fitting according to the third embodiment of the present invention. The fitting shown here is called a FIX window, and a panel (surface material) 70 is directly supported on a frame body 60. The frame body 60 is constructed by assembling left and right vertical frames 61 and 62, an upper frame 63, and a lower frame 64 around the four sides. The vertical frames 61 and 62, the upper frame 63, and the lower frame 64 are provided with surface material support walls 61a, 62a, 63a, and 64a facing each other from the outside and inside parts of the vertical frames 61 and 62, the upper frame 63, and the lower frame 64, respectively. The surface material support walls 61a, 62a, 63a, and 64a are provided with dovetail-shaped mounting parts 65 on the extended edges, and airtight materials 30 are attached to the respective mounting parts 65 via base parts 31. The airtight materials 30 used are the same as those in the first embodiment. The panel 70 has a rectangular flat plate shape, and each of the four peripheral edges is sandwiched between the airtight materials 30. The vertical frames 61, 62, upper frame 63, and lower frame 64 that make up the frame body 60 are all extruded shapes made of metal such as aluminum or resin, and are each configured to have a cross-sectional shape that is approximately uniform over the entire length along the longitudinal direction.

In the fitting of this embodiment 3, the airtight material 30 is interposed between the frame body 60 and the panel 70, so that it is possible to prevent the outside air and water from entering the room. Moreover, since the airtight material 30 is made of a thermally expandable material, when the fitting is exposed to high temperatures in the event of a fire, both the base 31 and the abutment 32 of the airtight material 30 will expand, so that it is possible to more reliably prevent the occurrence of a flame penetration hole between the frame body 60 and the panel 70. Furthermore, since the base 31 begins to expand after the abutment 32 expands, even if the gap between the frame body 60 and the panel 70 expands or a new gap occurs after the abutment 32 expands, it is possible to close it by expanding the base 31 afterwards, which is extremely advantageous in terms of fire resistance.

(Embodiment 4)
The fixed window is not limited to the one in which the panel 70 is directly supported by the frame 60 as shown in the third embodiment. For example, as shown in the fourth embodiment shown in Figs. 9 and 10, the fixed window may be configured by supporting a shoji (face material) 80 having frames 71, 72, 73, and 74 on the four sides of the panel 70a on the frame 60. That is, in the fourth embodiment, the vertical frames 71 and 72, the upper frame 73, and the lower frame 74 are arranged on the four sides of the panel 70a, and the shoji 80 is supported by the frame 60 in a state in which the airtight materials 30 of the face material support walls 61a, 62a, 63a, and 64a provided on the frame 60 abut against the visible surfaces of the frames 71, 72, 73, and 74. The airtight materials 30 are the same as those in the first embodiment. In the fourth embodiment, the same components as those in the third embodiment are denoted by the same reference numerals.

In the fitting of this embodiment 4, the airtight material 30 is interposed between the frame body 60 and the shoji screen 80, so that it is possible to prevent the outside air and water from entering the room. Moreover, since the airtight material 30 is made of a thermally expandable material, when the fitting is exposed to high temperatures in the event of a fire, both the base 31 and the abutment 32 of the airtight material 30 will expand, so that it is possible to more reliably prevent the occurrence of a flame penetration hole between the frame body 60 and the shoji screen 80. Furthermore, since the base 31 begins to expand after the abutment 32 expands, even if the gap between the frame body 60 and the frame 71, 72, 73, 74 of the shoji screen 80 expands or a new gap occurs after the abutment 32 expands, the base 31 can expand thereafter to close the gap, which is extremely advantageous in terms of fire resistance.

In the above-mentioned first to fourth embodiments, the airtight material 30 is configured so that the base 31 and the abutment portion 32 have different expansion start temperatures, but this is not necessarily limited to this as long as the airtight material has at least a portion with a different expansion start temperature. Also, when the airtight material 30 is configured with two portions with different expansion start temperatures, in the above-mentioned first to fourth embodiments, the boundary surface 30A between the two portions is made to coincide with the boundary surface between the base 31 and the abutment portion 32, but this is not necessarily limited to this. For example, the airtight material 30 may be configured so that two portions having different expansion start temperatures have an boundary surface 30A inside the base body 31a, as in configuration variant 1 shown in Figure 11(a); the airtight material 30 may be configured so that the boundary surface 30A of two portions having different expansion start temperatures coincides with the boundary surface between the base body 31a and the protrusion body 31b, as in configuration variant 2 shown in Figure 11(b); or the airtight material 30 may be configured so that the boundary surface 30A of two portions having different expansion start temperatures coincides with the boundary surface between the protrusion body 31b and the bulge body 31c, as in configuration variant 3 shown in Figure 11(c). Furthermore, the expansion start temperature of the base 31 is set higher than that of the contact portion 32, but the airtight material 30 may be configured so that the expansion start temperature of the contact portion 32 is higher than that of the expansion body 31c of the base 31, as in the configuration modification 4 shown in FIG. 12(a), or the airtight material 30 may be configured so that the expansion start temperatures of the base body 31a, the contact portion 32, and the expansion body 31c located on both sides of the protrusion 31b of the base 31 are higher, as in the configuration modification 5 shown in FIG. 12(b). In the airtight material 30 shown in these embodiments 1 and 2 and FIGS. 11 to 12, it is preferable that the parts with different expansion start temperatures are arranged side by side in the respective expansion directions.

In addition, the shape of the applied airtight material 30 is exemplified as one in which the abutment portion 32 extends from the base body 31a of the base 31 so as to be inclined, but the shape of the airtight material 30 is not limited to that of embodiment 1, and various shapes of airtight materials 30 can be applied, for example, as in shape modification 1 shown in FIG. 13 to shape modification 7 shown in FIG. 19. That is, in the airtight material 30 of shape modification 1 shown in FIG. 13, the abutment portion 32 is provided so as to extend from one side edge of the base body 31a in a perpendicular direction and then incline. In the airtight material 30 of shape modification 2 shown in FIG. 14, the abutment portion 32 is provided at both end edges of the base body 31a. In the airtight material 30 of shape modification 3 shown in FIG. 15, the abutment portion 32 is provided at one end edge and the central portion of the base body 31a. In the airtight material 30 of shape modification 4 shown in FIG. 16, the abutment portion 32 is provided at both end edges and the central portion of the base body 31a. In the airtight material 30 of shape modification 5 shown in FIG. 17, the abutment portion 32 is provided in a semi-cylindrical shape on the surface of the base body 31a. In the airtight material 30 of shape modification 6 shown in FIG. 18, the base body 31a is provided in a hollow square tube shape. In the airtight material 30 of shape modification 7 shown in FIG. 19, only the base body 31a is included as the base 31, and the abutment portion 32 is provided in its central portion. Although the expansion start temperature is not specifically indicated in each shape modification, it is sufficient that there are at least portions with different expansion start temperatures, similar to the airtight material 30 shown in embodiment 1, FIG. 11, and FIG. 12.

As described above, the airtight material of the present invention is an airtight material applied to a fixture having a frame body and a surface material arranged on the frame body, and is characterized in that it has a base portion attached to the frame body or the surface material and a contact portion abutting the frame body or the surface material, both of which are molded from a thermally expandable material and have portions with different expansion start temperatures.
According to this invention, when exposed to high temperatures during a fire or the like, both the base and the abutting parts of the airtight material will expand. Therefore, even if the face material is thermally deformed so as to curve relative to the frame body, it is possible to prevent gaps from occurring, and improve fire resistance. Moreover, since there are parts with different expansion start temperatures, the heat-expandable member will expand at different times. Therefore, for example, even if a gap between the frame body and the face material expands or a new gap occurs after the heat-expandable member expands at a relatively low temperature, there is an advantage that this can be blocked by the heat-expandable member that expands at a relatively high temperature.

The present invention is also characterized in that the airtight material has a portion in which the portions having different expansion start temperatures are arranged side by side in the respective expansion directions.
According to this invention, it is possible to prevent a situation in which a flame penetration hole is created when a part that expands at a relatively low temperature expands and then a part that expands at a relatively high temperature expands in the same direction due to a subsequent temperature rise.

The present invention is also characterized in that, in the above-mentioned airtight material, the base portion has a first expansion portion that begins to expand at a first set temperature, and the abutment portion has a second expansion portion that begins to expand at a second set temperature, and the first set temperature is set higher than the second set temperature.
According to this invention, the first expansion section expands at a relatively low temperature, which prevents the airtight material from falling off, and it becomes possible to subsequently expand the second expansion section at the desired portion, which is advantageous in terms of fire resistance.

The fitting according to the present invention is also characterized in that the above-mentioned airtight material is attached to a frame or a surface material via the base.
According to this invention, when exposed to high temperatures during a fire or the like, both the base and the abutting parts of the airtight material will expand. Therefore, even if the face material is thermally deformed so as to curve relative to the frame body, it is possible to prevent gaps from occurring, and improve fire resistance. Moreover, since there are parts with different expansion start temperatures, the heat-expandable member will expand at different times. Therefore, for example, even if a gap between the frame body and the face material expands or a new gap occurs after the heat-expandable member expands at a relatively low temperature, there is an advantage that this can be blocked by the heat-expandable member that expands at a relatively high temperature.

10, 40, 60 Frame body, 20, 80 Screen, 30 Airtight material, 31 Base, 32 Contact part, 50A Outer screen, 50B Inner screen, 70 Panel

Claims (4)

An airtight material applied to a fitting having a frame body and a surface material disposed on the frame body,
An airtight material having a base portion attached to the frame body or the surface material, and an abutment portion abutting the frame body or the surface material, wherein both the base portion and the abutment portion are molded from a thermally expandable material and have portions with different expansion start temperatures. The airtight material according to claim 1, characterized in that it has parts in which the parts with different expansion start temperatures are arranged side by side in the respective expansion directions. The airtight material according to claim 1, characterized in that the base portion has a first expansion portion that starts expanding at a first set temperature, and the contact portion has a second expansion portion that starts expanding at a second set temperature, and the first set temperature is set higher than the second set temperature. A fitting characterized in that the airtight material described in any one of claims 1 to 3 is attached to a frame or a surface material via the base.

Images