Fireproof door

The present invention relates to a fireproof door, which comprises a fire-protection glass and a support means for supporting the fire-protection glass, and the support means comprising an elastic member in contact with both surfaces of an edge portion of the fire-protection glass, a reinforcing frame for supporting the elastic member, and a fixing plate fixed to a support and corresponding to both surfaces of the reinforcing frame. The fireproof door of the present invention has a grade A fireproof performance.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a fireproof door, and more particularly, to a fireproof door having a grade A fireproof performance.

2. Description of the Related Art

In general, a fireproof door means a door having an ability to endure a fire. The fireproof door serves to gain time for persons to escape from a fire, prevent the spread of a fire, delay a fire propagation, and endure fire over a certain time. The fireproof doors are classified into grade according to the performance of fire resistance.

Here, the grade A fireproof performance of the fireproof door means that the performance of fire resistance can be ensured for 1 hour or more as a result of the tests according to the Korean Industrial Standards regulated in the Industrial Standardization Act.

Conventional fireproof doors with glass applied thereto, which have a fire-resistance for 1 hour or more, are mainly formed of steel, thereby being generally used as only a front door.

Such door can resist effectively the spread of fire if it is applied to a room door, but this door is not easily constructed as a room door due to the heterogeneity between the wooden indoor design and the steel door. In addition, due to cold sensation of steel itself, the conventional fireproof door is not harmonized with the interior design, thereby defiling a beauty of the interior design.

Due to such drawbacks, wooden fireproof doors with glass applied thereto are often commercialized in Europe. However, a fire-resistant glass without thermal deformation is employed in wooden fireproof doors to ensure fire resistance for 1 hour or more. In other cases, most fireproof doors just ensure fire resistance for less than 1 hour.

However, such a fire-resistant glass is expensive, which increases a burden on production costs, and there is also a limit in supply and demand. Thus, there is a practical problem in commercialization.

SUMMARY OF THE INVENTION

The present invention is conceived to solve the above-mentioned problems of the conventional fireproof door, an object of the present invention is to provide a fireproof door that may ensure a grade A fire-protection performance while being in harmonization with interior designs.

A fireproof door according to the present invention comprises a frame-shaped support having an opening formed thereon; a fire-protection glass placed in the opening of the support and supported to the support; and a support means fixed to the support for supporting the fire-protection glass to the support.

Here, the support means comprising an elastic member in contact with both surfaces of an edge portion of the fire-protection glass, fixing plates being fixed to the support and being in contact with both side surfaces of the elastic member through inner surfaces thereof to support the elastic member to the support, and a reinforcing frame provided between the fixing plate and the elastic member.

In particular, the elastic member is composed of a first portion corresponding to a terminal end of the fire-protection glass, second portions extending from both ends of the first portion and corresponding to both sides of the fire-protection glass, respectively, and third portions respectively bent from ends of the second portions toward the fire-protection glass, whereby the edge portion of the fire-protection glass is placed between the second portions of the elastic member and ends of the third portions of the elastic member are in contact with both side surfaces of the fire-protection glass.

Preferably, the elastic member may be divided into a plurality of unit elastic pieces, the unit elastic pieces are spaced from each other.

The fireproof door of the present invention may further comprise a nonflammable tape disposed between the reinforcing frame and the fixing plate and a flame retardant wood may be attached to an periphery of the fixing plate.

Also, the elastic member may have a plurality of slits in the bent third portion.

Preferably, the fixing plate is in contact with the fire-protection glass through an end portion bent toward the fire-protection glass.

In addition, the fireproof door of the present may further comprise an expansible flame retardant attached to a surface of the bent portion of the fixing plate. In particular, an expansible flame retardant may be received in a space formed between the reinforcing frame and the support and fixed to at least one of the fixing plate and the reinforcing frame through one surface thereof.

DESCRIPTION OF THE PREFERRED EMBODIMENT

Hereinafter, a fireproof door according to one embodiment of the present invention will be described in more detail with reference to the accompanying drawings.

FIG. 1is a perspective view showing an example of the fireproof door according to one embodiment of the present invention,FIG. 2is an enlarged perspective view taken along line A-A ofFIG. 1andFIG. 3is a detailed sectional view taken along line A-A ofFIG. 1.

A fireproof door500according to the embodiment comprises a frame-shaped support300having an opening formed thereon, a fire-protection glass10placed in the opening of the support and supported to the support300and a supporting means100for supporting the fire-protection glass10to the support300.

The support means100comprises an elastic member110which is in contact with both surfaces of an edge portion of the fire-protection glass10, fixing plates140fixed to the support300and contacted to both side surfaces of the reinforcing frame120and a reinforcing frame120provided between the fixing plate140and the elastic member110.

The elastic member110may be composed of a first portion111corresponding to an end portion of the fire-protection glass10, second portions112extended from both ends of the first portion111and corresponding to both side surfaces of the fire-protection glass10, respectively, and third portions113bent from ends of the second portions112toward the fire-protection glass10, respectively.

In the above structure, the edge portion of the fire-protection glass10is placed between the second portions112of the elastic member110and ends of the third portions113of the elastic member110are in contact with both side surfaces of the fire-protection glass10.

The elastic member110elastically supports the fire-protection glass10so as to prevent the fire-protection glass10from being separated from the support100when the fire-protection glass10is moved freely and deformed at the time of the fire.

Also, the elastic member110is preferably formed such that, in a case where the fire-protection glass10is moved freely and deformed in a fire, the first portion111corresponding to the end portion of the fire-protection glass10and the second portions112corresponding to both the side surfaces of the fire-protection glass10are sufficiently spaced from the fire-protection glass10to prevent the fire-protection glass10from being broken.

In this embodiment, the elastic member110may be formed by bending a metal plate with elasticity, and particularly, the metal plate is preferably formed of spring steel.

FIG. 4is an enlarged perspective view showing a coupling state of a fire-protection glass and an elastic member constituting a fireproof door according to one embodiment of the present invention.

As shown inFIG. 4, the elastic member110may consists of a plurality of unit elastic pieces (hereinafter, the numeral reference110indicates the unit elastic piece), each of which is in contact with the edge portion of the fire-protection glass10. Also, the unit elastic pieces110are spaced apart from each other at certain intervals.

In a case where the single elastic member110is in contact with the entire edge portion of the fire-protection glass10, it is difficult to form a sufficient gap between the elastic member110and the fire-protection glass10when the fire-protection glass10is moved freely in the opening of the support means100at the time of the fire, and so the fire-protection glass10may be broken.

In addition, since heat is rapidly transferred due to the material of the elastic member, the internal temperature of the support means100and the surface temperature of the fire-protection glass10are rapidly increased. Thus, it is difficult to expect that the elastic member110prevents a separation of the fire-protection glass10from the support means100. On the contrary, if a plurality of the unit elastic pieces110are spaced apart from each other at large intervals and are in contact with the fire-protection glass10, the fire-protection glass10is moved freely at the time of fire, and so the fire-protection glass10is separated from the unit elastic pieces110.

FIG. 5is an enlarged perspective view of “B” portion inFIG. 4and illustrates the elastic member constituting the fireproof door according to one embodiment of the present invention.

As shown inFIG. 5, the elastic member110(or the unit elastic piece) is preferably configured such that a plurality of slits115are formed in the bent third portion113.

In this embodiment, due to the plurality of slits115as described above, the bent third portion113of the elastic member110is divided into a plurality parts. As a result, although a part of the bent third portion113is deformed by the movement of the fire-protection glass10and does not grip the fire-protection glass10, the remained parts of the bent third portion113may grip the fire-protection glass10.

In addition, it is preferable that an expansible flame retardant153is provided between the fire-protection glass10and the first portion111of the elastic member110. Preferably, one surface of the expansible flame retardant153is fixed to the first portion111of the elastic member110.

The reinforcing frame120constituting the supporting means100may be coupled to the elastic member110along an outer periphery of the elastic member. In a case where the fire-protection glass10is moved freely within support means100in a fire, the reinforcing frame120acting as a member capable of holding more securely the fire-protection glass10.

In this embodiment, the reinforcing frame120may be formed by bending a metal plate with elasticity. In particular, the metal plate is preferably a zinc-coated steel plate.

In particular, the reinforcing frame120is preferably configured such that the elastic member110may be mechanically fitted thereto.

The support300may be made of retardant plywood that is generally filled in a wooden fireproof door. In particular, it is preferable that the support300is made of a calcium silicate board.

As the fireproof door in this embodiment, the support300can be separated from an indoor wall of a building. However, the present invention is not limited thereto. In a case where the support300is fixed to a wall corresponding to an exterior, the support may be used as a fireproof window frame, and this modification will be included within the scope of the present invention.

Meanwhile, an end portion of the fixing plate140may be bent toward the fire-protection glass10. By bending the end portion of the fixing plate, it is possible to prevent the reinforcing frame120and the elastic member110supporting the fireproof glass10from being deviated in a fire.

In addition, at least one expansible fire-protective members (flame retardant)154and155are preferably attached to inner surfaces of the bent portions of the fixing plates

The expansible flame retardant154and155are expanded in a fire to prevent the elastic member110and the reinforcing frame120from being separated from the fire-protection glass10. Also, the flame retardant154and155prevent heat possessed in the fire-protection glass10placed out of the support means from being transferred into the support means100, thereby lowering the temperature of a surface the fireproof door, which is opposite to a surface corresponding an area in which a fire is occurred.

The fireproof door500according to this embodiment may further comprise a nonflammable tape130disposed between the reinforcing frame120and the fixing plate140.

The nonflammable tape130is not burned easily. Preferably, the nonflammable tape130has elasticity and is disposed between the reinforcing frame120and the fixing plate140.

In this embodiment, since the elastic member110, the reinforcing frame120and the fixing plates140are made of steel with high thermal conductivity, the nonflammable tape130restrains heat from being transferred, and so the temperature of a surface the fireproof door, which is opposite to a surface corresponding an area in which a fire is occurred, is lowered.

In this embodiment, the nonflammable tape130is preferably made of a ceramic material.

Preferably, the fireproof door500according to this embodiment may further include expansible flame retardant151and152, which are received in spaces defined between the reinforcing frame120and the support300. Each of the expansible flame retardant is attached to at least one of the fixing plate140and the reinforcing frame120.

In this embodiment, each of the expansible flame retardant151,152,153,154, and155is preferably made of graphite (“expansible graphite”). The expansible graphite causes water and oxidized compounds contained therein to generate gas by heat, and as a result, a scale-shaped graphite is expanded to form a stable layer against heat or chemicals, thereby exhibiting flame retardant effects.

In particular, the expansible graphite forming the expansible flame retardant of this embodiment is a flame retardant material free from halogen and is environment-friendly since an incendiary property may be controlled to a low level. This graphite prevents or delays the collapse of the fireproof door caused by flame generated at the time of the fire.

The expansible flame retardant is expanded in a fire to intercept fire propagation, delays heat transfer together with the nonflammable tape to lower the temperature of a surface the fireproof door, which is opposite to a surface corresponding an area in which a fire is occurred, and so the fireproof door is not easily burnt.

In the fireproof door500according to this embodiment, flame retardant woods200are attached to the periphery of the fixing plates140. The flame retardant woods200harmonizes the fireproof door with the interior designs and improves retardant performance.