RU2270311C2 - Fire door and fire door latch - Google Patents

Fire door and fire door latch Download PDF

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Publication number
RU2270311C2
RU2270311C2 RU2004104175/03A RU2004104175A RU2270311C2 RU 2270311 C2 RU2270311 C2 RU 2270311C2 RU 2004104175/03 A RU2004104175/03 A RU 2004104175/03A RU 2004104175 A RU2004104175 A RU 2004104175A RU 2270311 C2 RU2270311 C2 RU 2270311C2
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Russia
Prior art keywords
door
frame
door leaf
fire
fire door
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RU2004104175/03A
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Russian (ru)
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RU2004104175A (en
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Игорь Анатольевич Клейменов (RU)
Игорь Анатольевич Клейменов
ков Николай Николаевич Тепл (RU)
Николай Николаевич Тепляков
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Общество с ограниченной ответственностью "НПП "Модуль-К"
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Priority to RU2004104175/03A priority Critical patent/RU2270311C2/en
Publication of RU2004104175A publication Critical patent/RU2004104175A/en
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Abstract

FIELD: building, particularly fire doors.
SUBSTANCE: fire door comprises at least one door leaf with metal case forming outer door leaf surfaces, heat insulation means, stiffening frame and lock with latching mechanism, as well as door frame with ledge and hinges to connect the door leaf to the door frame. The heat insulation means is multilayered and includes two outer layers adjoining metal case but non-connected with it and at least one inner layer. Outer heat insulation means layers are made of material having greater heat conductivity and greater rigidity in comparison with that of inner layer material. The stiffening frame is arranged inside the door leaf and formed of U-shaped profile having central part fixedly connected with end surfaces of the door leaf along perimeter thereof. Both flanges are arranged in inner layer of the heat insulation means. The door has two latches snapped into action under the action of heat. The latches are located at end surfaces of the door leaf in corners thereof from door frame ledge side and spaced maximal possible distance from the hinges.
EFFECT: increased fire-resistance.
19 cl, 10 dwg

Description

The invention relates to the field of fire fighting equipment, in particular to fire doors and other similar devices, passively protecting openings in structures from an open flame.
The technical problem to be solved when creating fire doors is to create a simple structure that can reliably protect an enclosed space from an open flame for a certain period of time, i.e. design with the necessary fire resistance.
In the prior art, this problem has been solved in various ways.
A fire-resistant door leaf is known, including steel sheets forming the outer surfaces of the leaf, a fire-resistant high-density mineral wool aggregate and layers of an adhesive composition containing liquid alkali metal silicate and mineral powder, which is equipped with asbestos gaskets located between the inner surfaces of the steel sheets and the mineral wool filler and connected to these sheets and filler through layers of an adhesive composition containing a mixture of chalk, kaolin and fly ash, while the non-absorbent aggregate is made of slag, and the outer surfaces of the steel sheets are covered with a layer of fire-retardant paint (see, for example, RF patent No. 2158817, IPC E 06 B 5/16, publ. 2000.11.10). The presence of asbestos gaskets increases the fire resistance of a door leaf of this design, but it has the following disadvantages: firstly, gluing asbestos gaskets to steel sheets and to a filler, as well as coating the sheet with fireproof paint, complicates and increases the cost of the door manufacturing process; secondly, these technological operations introduce instability in the quality of manufactured products; thirdly, it is known that asbestos-based materials are fragile, therefore gluing asbestos gaskets to steel sheets having a coefficient of linear and volume expansion other than asbestos will lead to premature failure upon deformation of the door from heating; fourthly, the absence of stiffeners in the design reduces its resistance to thermal deformations and, fifthly, fixing the door leaf only by means of a lock latch and hinges will lead to the appearance of gaps in the upper and lower corners of the door when it is deformed by heating, i.e. reduce fire resistance of the door as a whole.
Closest to the present invention is a fire door "DKS", consisting of a door frame with a limiting doorway narthex, to which is fixed on hinges a door leaf formed by connected to each other casings of sheet steel with in the internal space between the shells with heat-resistant insulation and reinforced by a closed stiffness frame formed in the steel profile located in this space around the perimeter and, in which the thickness of the frame is less than the distance between the inner surfaces of the shells, while the supporting surface of the stiffening frame is pressed against the shell located on the side of the door opening, and the gap between the ends of the shelves of the stiffening frame perpendicular to its supporting surface and the shell of the cloth located on the side of the narthex , filled with heat-resistant insulation (see RF patent No. 2116426, IPC E 06 B 5/16, publ. 1998.07.27). The presence of a stiffening frame increases the fire resistance of this design in comparison with the design described above, however this is only true in the event of a fire from the vestibule, when the stiffening frame is separated from the temperature by a layer of heat-resistant insulation, in case of fire, on the other side, the frame will heat up together with the shell. The presence of only fibrous heat-resistant insulation does not provide high fire resistance, and most importantly its stability. In addition, as in the previous case, in this design there is no fixation of the corners of the door leaf and although, according to the authors, this will not lead to the formation of gaps that violate the fire resistance of the structure, this can only be agreed in case of a sufficiently wide door frame.
The prior art devices that secure the door leaf of the fire door with the help of three pull-out crossbars interconnected by means of rods (see, for example, NEMEF brochure). However, such a crossbar design has the following disadvantages. According to the requirements for the operating conditions, the door leaf of the fire door must be non-separable, and there is a problem with the repair of the crossbars if, for some reason, their unauthorized operation occurred, for example, due to a break in the traction inside the door leaf.
Autonomous crossbars that are triggered by heating to a certain temperature, including a cylindrical body, a movable element containing a guide and the latch itself, a spring and a fusible insert or filled with fusible material (see, for example, UK patents No. 2237835, IPC E 06 B 3 / 72, publ. 05.15.1991 and No. 2321492, IPC E 05 B 65/06, publ. 07.29.1998). This design provides for the exact installation of the crossbar in the door leaf, which creates problems if the door leaf has a thin-walled shell, since in this case, the installation of the crossbars requires the introduction of structural additional elements to fix the crossbar in place and align it with the receiving hole. In addition, while inside the door leaf, the bolt will warm up more slowly than the outer surfaces, which increases its response time. The presence in the crossbar of a fusible insert made of sufficiently soft material can lead to spontaneous operation of the crossbar, and since the crossbar is not collapsible, this can lead to its unsuitability for further use. The closest technical solution to the claimed invention in terms of the crossbar is the crossbar according to UK patent No. 2321492.
The technical problem solved by this invention is the creation of a simple, technological design of a fire door with high fire resistance (EI not less than 60 min according to GOST 30247.0 "Building structures. Test method for fire resistance. General requirements").
The problem is solved in that in the fire door comprising at least one door leaf containing a metal shell forming the outer surfaces of the door leaf, heat insulation, a stiffener frame and a latch lock, a door frame with a vestibule, and hinges fastening the door leaf to door frame, the thermal insulation is multilayer, including two outer layers adjacent to the metal shell, but not associated with it, and at least one inner layer, the outer layers of thermal insulation made of m terial having a higher coefficient of thermal conductivity and higher rigidity compared with the material of the inner layer, the stiffness frame is placed inside the door leaf and is made of a U-shaped profile, the middle part of which is rigidly connected with the end surfaces of the door leaf along the perimeter, and both shelves are placed in the inner layer of thermal insulation, while the door is equipped with two crossbars that are triggered by heating, mounted on the end surfaces of the door leaf in the corners of the vestibule at a distance, max imalno remote from the hinges.
The outer layers of thermal insulation are made of flexible fiber sheets (GVL) or drywall sheets, and the inner layer is made of mineral fiber containing basalt fiber with a diameter of not more than 1 μm.
The metal shell of the door leaf is made of two parts, one of which has a trough shape with the shelves bent outward to form a protrusion, and the second part is a sheet that is rigidly connected to these shelves by welding or rolling.
The door frame can be made of two parts, each of which is formed of pipes of rectangular cross-section, placed around the perimeter of the door. The pipes of the first and second parts have cross-sectional areas that are rotated relative to each other to form a vestibule. Thermal insulation is placed between the first and second parts of the frame, and the parts are fastened together by means of separate metal plates located on the outside of the frame.
The thermal insulation of the door frame is made of gypsum fiber or asbestos cord.
The door frame can be made of an L-shaped profile.
On the surface of the protrusion of the door leaf adjacent to the door frame, is installed a sealant from cold smoke, made of heat-resistant rubber.
On the end surfaces of the door leaf and the surfaces of the door frame mating with them, a coating is intumescent at a temperature of not more than 160 ° C.
The fire door may be provided with a second door leaf, similar to the first, while the second leaf is made with the possibility of fixing to the door frame.
An opening can be made in the door leaf, in which a translucent fire-prevention double-glazed window is installed.
The end surface of the door leaf, on the hinge side, is equipped with three passive crossbars made in the form of pins and placed uniformly along the length of the specified surface, while receiving recesses or holes are made in the door frame.
The door frame is equipped with openings located on its front surface opposite the crossbars that are triggered by heating, to open the doors during emergency operation of the crossbars.
The bolt for the fire door, triggered by heating, includes a housing, a movable element containing a guide and a retainer, a spring and a fusible insert, in which the housing is made in the form of a sleeve and is equipped with a mounting plate mounted on its end with a hole for the passage of the latch, as well as a removable mounting element of the spring located on the opposite end of the housing, and the movable element is equipped with a shank on which the end of the spring is located, and the end I part of the clamp is made conical and located in the initial position in the hole of the mounting plate, while the fusible insert is supported on the mounting plate and made rigid in the form of a ring through which the conical part of the clamp passes.
The length l 1 of the specified guide is selected to be greater than or equal to its diameter D 1 , while the length l 2 of the cylindrical part of the retainer is 1.5 D 1 , the conical part l 3 is 0.3 D 1 , and the ratio of the diameter D 2 of the retainer to the diameter D 1 guide rail is approximately 0.9.
The fusible insert is made of a material based on polyvinyl chloride or other similar rigid material.
The guide on the side of the latch is chamfered to facilitate the movement of the movable element.
The length l 4 of the shank of the movable element is at least three diameters d of the spring wire.
The outer layers of thermal insulation made of flexible fiber sheets, installed between the metal sheath and the inner layer of thermal insulation, act as a screen that, when the door is heated, scatters and equalizes the heat flux over the entire area of the structure. In the construction made according to the invention, the flexible fiber sheets are not connected with the metal shell, therefore, although they have different volume and linear expansion coefficients with it, the sheets do not get carried away with it and do not break when the shell is heated and bent. This allows GVL to play the role of a screen much longer than it does asbestos gaskets in the well-known technical solution according to the patent of the Russian Federation No. 2158817.
The stiffness frame made of a U-shaped profile, firstly, is more rigid compared to the frame described in the closest analogue (RF patent No. 2116426), made from a corner, and secondly, it does not come into contact with any of the metal sides door leaf shell and therefore heats up longer in case of fire. This means that the frame made according to this invention is able to hold the door leaf longer from bending when heated than the known frame. Thirdly, U-shaped shelves fix flexible fibrous sheets without tightly adhering to them, which allows the frame and flexible fibrous sheets to deform when heated, each according to their own laws without mutual destruction. Tests have shown that flexible fibrous sheets remain intact during heating due to the expansion of the inner layer of thermal insulation and the pressure of the outer layers to the metal shell.
The presence of crossbars made according to the present invention and installed in the corners of the door leaf at a distance as far as possible from the hinges allows the door leaf to be securely fixed in case of fire and to significantly increase the fire resistance of the door due to the following. The fixing plate, rigidly connected to the crossbar body, ensures its fixation in two mutually perpendicular planes, which completely excludes the possibility of opening the door after the crossbars are triggered by the action of temperature. The implementation of the fusible insert in the form of a ring made of a material that is more rigid than in the known technical solutions prevents, on the one hand, spontaneous operation of the bolt, and on the other hand provides faster heating of the massive conical part of the clamp passing through the fusible insert opening and being a heat conductor. As a result, the fusible insert adjacent to the conical part of the latch will collapse at the softening temperature of the insert material (lower than its melting temperature) and will be squeezed out into the gap between the end of the latch and the hole of the mounting plate and then into the free zone between the end surface of the door leaf and the door frame. Such destruction of the fusible insert will reduce the response time of the bolt, and thus increase the fire resistance of the door. The selected geometric parameters of the crossbar elements ensure the reliability of its operation.
So the selected length of the guide prevents jamming of the movable element in the housing, which also contributes to the chamfer on the side of the latch.
The presence of a shank, on which the end of the spring is mounted, ensures uniform movement of the movable element and eliminates the bias of the spring and excessive friction of the spring against the housing wall, since in the presence of a shank, the spring can be installed with a gap relative to the walls of the housing.
A removable fastener allows you to disassemble and repair the crossbar, if necessary. Known designs are made non-separable and therefore not suitable for repair.
Further, the essence of the present invention is explained with reference to the accompanying drawings, which show the following:
Figure 1 - fire door made according to the invention, a General view.
Figure 2 is the same, section aa of figure 1.
Figure 3 - fire door with a door frame made of an L-shaped profile, and a second door leaf, General view.
Figure 4 is the same, section bB of figure 3.
Figure 5 - fire door equipped with a translucent double-glazed window, General view.
6 - triggered when heated crossbar, General view, section.
7 is the same, view from the side of the mounting plate.
Fig - diagram of the deformation of the door leaf when exposed to flame from the porch, side view.
Fig.9 is a diagram of the deformation of the door leaf when exposed to flame from the narthex side, top view.
Figure 10 is a diagram of the deformation of the door leaf when exposed to flame from the side opposite to the narthex, side view.
Fire door (figure 1, 2) includes a door leaf 1, a door frame 2 with a narthex 3 and a hinge 4, fastening the door leaf 1 to the door frame 2. The door leaf 1 contains a metal shell forming its outer surfaces, thermal insulation, a frame of rigidity and the lock 5 with a latch 6. The thermal insulation is made of several layers, for example three, and includes two outer layers 7, 8 and an inner layer 9. The outer layers 7, 8 are adjacent to the metal shell, but are not connected with it. The outer layers of heat insulation 7, 8 are made of gypsum fiber (these layers can be made of gypsum plasterboard sheets), and the inner layer 9 is made of mineral fiber containing basalt fiber having a diameter of 1 μm.
GVL has a high thermal conductivity coefficient λ = 0.16-0.37, and the material of the inner layer 9 has a much lower thermal conductivity coefficient (λ = 0.037), while GVL has a higher stiffness. The frame of rigidity is placed inside the door leaf 1 and is made of a U-shaped metal profile, the middle part 10 of which is rigidly connected by welding with the end surfaces 11 of the door leaf 1 around the perimeter, and both shelves 12 are placed in the inner layer 9 of thermal insulation. The door is equipped with two crossbars 13, triggered by heating, mounted on the end surfaces 11 of the door leaf 1 in the corners of the narthex 3 at a distance as far as possible from the hinges 4.
The metal shell of the door leaf 1 is made of two parts 14 and 15. Part 14 has a trough shape with the shelves bent outward, forming a protrusion 16, and the second part 15 is a sheet that is rigidly connected to these shelves by welding or rolling.
The door frame 2 (figure 2) can be made of two parts 17, 18, each of which is made of rectangular pipes placed around the perimeter of the door. The pipes of the first and second parts 17, 18 have cross-sectional areas that are rotated relative to each other with the formation of a vestibule 3. Thermal insulation 19 is placed between the first and second parts 17, 18 of the frame 2. Parts 17, 18 are fastened together by means of separate metal plates 20 located on the outside of the frame 2.
Thermal insulation 19 is made of GVL or asbestos cord.
The door frame 2 may be made of a L-shaped profile 21, as shown in figure 3. On the surface of the protrusion 16 of the door leaf 1 adjacent to the door frame 2, a seal 22 against cold smoke is installed, made of heat-resistant rubber, for example, agrax-P.
On the end surfaces 11 of the door leaf 1 and the surfaces 23 of the door frame 2 mating with them, a coating is expanded that swells at a temperature of not more than 160 ° C, for example, KOP-100.
The fire door can be provided with a second door leaf 24, as shown in FIGS. 3, 4. Its construction is similar to that described above for the door leaf 1. The door leaf 24 can be fixed to the door frame 2 both when the door leaf is open and closed. one.
In the door leaf 1 or 24, an opening 25 can be made (Fig. 5), in which a translucent fire-prevention glass unit is installed, made, for example, in the form of a window 26 and containing either fire-prevention glass 27, or laminated safety glass, or any suitable material or composition such materials.
The end surface 11 of the door leaf 1, on the hinge side 4, is equipped with three passive crossbars 28 (Figs. 1, 2), made in the form of pins and placed uniformly along the length of the indicated surface, while receiving recesses or holes 29 are made in the door frame 2.
The door frame 2 is provided with openings 30 located on its front surface opposite the crossbars 13, which are triggered by heating, to open the doors during emergency operation of the crossbars 13.
The bolt 13 (FIGS. 6, 7) contributes to the solution of the problem for a fire door that is triggered by heating, including a housing 31, a movable element comprising a guide 32 and a retainer 33, a spring 34 and a fusible insert 35. The housing 31 is made in the form of a sleeve and is equipped with a mounting plate 36 mounted on its end. An opening 37 is made in the plate 36 for the passage of the latch 33. The housing 31 is also provided with a removable fastener 38 of the spring 34 located on the opposite end of the housing 31. The movable element is equipped with a shank 39 on which the end of the spring 34 is mounted. The end portion 40 of the latch 33 is conical and located in the initial position in the hole 37 of the mounting plate 36. The fusible insert 35 is supported on the mounting plate 36 and is made in the form of a ring through which the conical portion 40 of the retainer 33 passes.
The length l 1 of the specified guide 32 is selected to be greater than or equal to its diameter D 1 , while the length l 2 of the cylindrical part of the retainer 33 is 1.5 D 1 , the conical part l 3 is 0.3 D 1 , and the ratio of the diameter D 2 of the retainer 33 to the diameter D 1 of the guide 32 is approximately 0.9. In this example, D 1 is 15 mm.
The fusible insert 35 is made of a material based on polyvinyl chloride, for example polypropylene, having a softening temperature of 75 ° C.
The guide 35 on the side of the retainer 33 is chamfered 41. The length l 4 of the shank 39 is at least three diameters d of the spring wire 38.
Fire door is made as follows.
Billets of the required length are cut from pipes of various rectangular cross-sections, the required holes and recesses are made in them, and parts 17, 18 of the door frame are welded. They place heat insulation 19 from GVL between parts 17, 18, connect outside the perimeter with plates 20 by welding, and hinges 4 are welded on the front side. A trough-like part 14 of door leaf 1 is formed from a steel sheet 1.5 mm thick, and the outer layer 8 of heat insulation is laid inside whole sheet GVL. To the end surfaces 11 are welded around the perimeter of the middle part 10 of the U-shaped profile, forming a frame of rigidity. The crossbars 13 and passive crossbars 28 are installed. The inner layer 9 of mineral wool thermal insulation containing basalt fiber with a diameter of 1 μm is laid, filling the gap between the shelves 12 and the outer layer 8 of thermal insulation. The gap is approximately 2-3 mm. On top of the inner insulation layer 9, an outer layer 7 of GVL is placed. The second part 15 of the door leaf is cut out from a steel sheet 1.5 mm thick and welded along the perimeter to the shelves of part 14 to form a protrusion 16. The lock 5 with latch 6 is installed in place. Then, a decorative coating, for example polyester, is applied to the door frame and door leaf. powder paint. After the decorative coating has dried, a seal 23 against cold smoke is installed on the protrusion 16 by means of an adhesive, and an intumescent coating is applied when heated when applied to the end surfaces 11 of the door leaf and adjacent surfaces of the door frame 23. Then the door leaf 1 is hung on the hinges 4. The finished door is mounted in the doorway.
When a fire occurs, the door made according to the present invention operates as follows.
When the flame acts on the door leaf 1 from the narthex side 3, as shown in Figs. 8, 9, at the first stage, the leaf 1 fixed at three points due to the latch 6 of the lock 5 and the hinges 4 will slightly bend towards the flame, since the outer layer of thermal insulation 8, made of a single sheet of GVL, acts as a screen that scatters and equalizes the heat flux over the entire area of the door leaf 1 and at the same time protects the stiffness frame from heating. At the second stage, when the surface of the door leaf 1 reaches a temperature of about 160 ° C, the door frame 2 will heat up, and the crossbar 13 will also heat up with it, which will lead to its operation. Tests have shown that the bolt 13 is triggered after about 5 minutes from the moment the flame starts to act on the door leaf, with additional fixing of the door leaf 1 in the upper and lower corners. Placing the crossbar on the side of the narthex at a distance as far as possible from the hinges ensures minimum bending moments in the upper and lower corners when bending the door leaf from heating, which increases the fire resistance of the door by about 30%.
When the flame acts on the door leaf 1 from the front side, as shown in Fig. 10, the door leaf 1 bends towards the flame, while the upper and lower corners are pressed against the door frame 2. The load on the crossbars 13 in this case decreases, resulting in fire resistance the doors will be higher.
Fire resistance according to the specified GOST 30247.2 was tested on a fire door with the following parameters: the door leaf sheath is made of steel grade St.3, 1.5 mm thick; the outer layers of thermal insulation are made of GVL 10 mm thick; the inner layer of thermal insulation is made of 40 mm thick basalt wool. The fire resistance of this door (EI) when exposed to a flame from the narthex side was 68 minutes, and when exposed to a flame from the front side, 72 minutes.
From the foregoing, it follows that the fire door, made according to the present invention, has a simple, technologically advanced construction with increased fire resistance compared to known analogues.

Claims (19)

1. Fire door, comprising at least one door leaf containing a metal shell forming the outer surfaces of the door leaf, heat insulation, a stiffener frame and a latch lock, a door frame with an overhang and hinges fastening the door leaf to the door frame, characterized in that the heat insulation of the door leaf is multilayer, including two outer layers adjacent to the metal shell, but not associated with it, and at least one inner layer, the outer layers of thermal insulation made of material having a higher coefficient of thermal conductivity and higher rigidity compared with the material of the inner layer, the stiffness frame is placed inside the door leaf and is made of a U-shaped profile, the middle part of which is rigidly connected with the end surfaces of the door leaf along the perimeter, and both shelves are placed in the inner layer of thermal insulation, while the door is equipped with two crossbars that are triggered by heating, mounted on the end surfaces of the door leaf in the corners of the vestibule at a distance of maximum DUTY remote from the hinges.
2. Fire door according to claim 1, characterized in that the outer layers of thermal insulation are made of gypsum or gypsum board sheets, and the inner layer is made of mineral fiber containing basalt fiber with a diameter of not more than 1 μm.
3. Fire door according to claim 1 or 2, characterized in that the metal shell of the door leaf is made of two parts, one of which has a trough-like shape with the shelves bent outward to form a protrusion, and the second part is a sheet that is rigidly connected to the specified shelves by welding or rolling.
4. Fire door according to claim 1, characterized in that the end surfaces of the door leaf and the surfaces of the door frame mating with them are coated with a swell at a temperature of not more than 160 ° C.
5. Fire door according to claim 3, characterized in that the door frame is made of two parts, each of which is formed of rectangular pipes placed around the perimeter of the door, while the pipes of the first and second parts have different cross-sectional areas that are rotated relative to each other with the formation of a porch, heat insulation is placed between the first and second parts, and the parts are fastened together by means of separate metal plates located on the outside of the frame.
6. Fire door according to claim 5, characterized in that the thermal insulation between the parts of the door frame is made of plaster fiber material or asbestos cord.
7. Fire door according to claim 6, characterized in that on the surface of the protrusion of the door leaf adjacent to the frame, there is a seal from cold smoke made of heat-resistant rubber.
8. Fire door according to claim 5, characterized in that the door frame is provided with holes located on its front surface opposite the crossbars that are triggered by heating, to open the doors during abnormal operation of these crossbars.
9. Fire door according to claim 3, characterized in that the door frame is made of a L-shaped profile.
10. Fire door according to claim 9, characterized in that on the surface of the protrusion of the door leaf adjacent to the frame, a gasket from cold smoke, made of heat-resistant rubber, is installed.
11. Fire door according to claim 9, characterized in that the door frame is provided with holes located on its front surface opposite the crossbars that are triggered by heating, to open the doors during abnormal operation of these crossbars.
12. Fire door according to claim 3, characterized in that it is provided with a second door leaf made according to any one of claims 1 to 3 and with the possibility of fixing to the door frame.
13. Fire door according to claim 3, characterized in that the doorway is made an aperture in which a translucent fireproof glass is installed.
14. Fire door according to claim 3, characterized in that the end surface of the door leaf on the hinge side is provided with three passive crossbars made in the form of pins and placed uniformly along the length of the specified surface, while receiving recesses or holes are made in the door frame.
15. The crossbar for a fire door, triggered by heating, comprising a housing, a movable element comprising a guide and a retainer, a spring and a fuse, characterized in that the housing is made in the form of a sleeve and is equipped with a mounting plate mounted on its end, in which an opening is made for the passage of the latch, and a removable mounting element of the spring located on the opposite end of the housing, the movable element is equipped with a shank on which the end of the spring is placed, and the end part of the latch is made conical and located in the initial position in the hole of the mounting plate, while the fusible insert is supported on the mounting plate and made rigid in the form of a ring, and the conical part of the retainer is supported on the inner surface of the ring and extends beyond it.
16. The bolt according to claim 15, characterized in that the length l 1 of said guide is greater than or equal to its diameter D 1 , while the length l 2 of the cylindrical part of the retainer is 1.5 D 1 , the conical part l 3 is 0.3 D 1 and the ratio of the diameter D 2 of the retainer to the diameter D 1 of the guide is 0.9.
17. The bolt according to claim 15 or 16, characterized in that the fusible insert is made of a material based on polyvinyl chloride.
18. The bolt according to claim 15, characterized in that the guide from the side of the latch is chamfered.
19. The bolt according to claim 15, characterized in that the length l 4 of the shank of the movable element is at least three diameters d of the spring wire.
RU2004104175/03A 2004-02-16 2004-02-16 Fire door and fire door latch RU2270311C2 (en)

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RU2700718C2 (en) * 2018-03-14 2019-09-19 Федеральное государственное казенное военное образовательное учреждение высшего образования "Военный учебно-научный центр Военно-Морского Флота "Военно-морская академия им. Адмирала Флота Советского Союза Н.Г. Кузнецова" Fireproof door for household and industrial premises

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RU2535459C1 (en) * 2013-04-12 2014-12-10 Закрытое акционерное общество "Континент ЭТС" Fire-prevention door leaf
RU2535286C1 (en) * 2013-04-12 2014-12-10 Закрытое акционерное общество "Континент ЭТС" Double-leaf fire-prevention gates (versions)
RU185473U1 (en) * 2017-12-05 2018-12-05 Андрей Геннадьевич Тимофеев Metal-plastic door for rooms
RU2700718C2 (en) * 2018-03-14 2019-09-19 Федеральное государственное казенное военное образовательное учреждение высшего образования "Военный учебно-научный центр Военно-Морского Флота "Военно-морская академия им. Адмирала Флота Советского Союза Н.Г. Кузнецова" Fireproof door for household and industrial premises
RU2698434C1 (en) * 2018-04-03 2019-08-26 Общество с ограниченной ответственностью "Гарант" Protective and decorative door leaf
RU183812U1 (en) * 2018-06-18 2018-10-03 Общество с ограниченной ответственностью "Дорлок" Door thermal blocker

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