JPH0831552A - Heat radiating body for thawing snow on steps - Google Patents

Abstract

PURPOSE:To make it unnecessary to change the whole body of a heat radiating body and make it sufficient to change only a protective layer of a step sides which is damaged and worn easily by making the protective layer in the step side of the heat radiating body composed of two layers and forming a specified intermediate layer between the two layers. CONSTITUTION:Regarding a heat radiating body 11, a first protective layer 6 and a second protective layer 7 are formed for protecting and water-proofing purposes on a panel-like heat radiating element 12. An intermediate layer 8 to make peeling of the upper layer easy is formed between those protective layers. The intermediate layer 8 formed between the protective layers 6 and 7 makes the peeling of the protective layers 6, 7 and on the other hand the layer 8 has a function to prevent the layers from shifting relatively in transverse directions. The intermediate layer 8 is formed by spreading preferably inorganic pulverized matters (granular matters) with 10-3000mum average particle size on the surface of the protective layer 6. The protective layer 7 is formed by overlaying the layer 7 on the intermediate layer 8 and sticking both layers together by heating.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a step snow melting heating element installed at a step step of a building entrance in a snowy area. By installing this heating element, it is possible to prevent snow accumulation and icing on the step part and prevent personal injury due to slipping, falling, etc.

[0002]

2. Description of the Related Art The step portion of a structure having a staircase at the entrance of a building constructed in a snowy area becomes very slippery during snowfall or freezing, and a personal injury caused by stepping off or falling has been postponed. Not in the present situation.

As a method of solving this problem, specifically, in Japanese Utility Model Laid-Open No. 01-60388, first, a heat insulating material is placed on the step for the purpose of enhancing snow melting efficiency, and the entire front and back surfaces of the heating element are electrically insulated. It is proposed that the snow melting sheet be attached to the stairs with a structure in which heating elements covered with a waterproof sheet are placed in layers. In Japanese Utility Model Publication No. 04-12181, a heating element is covered with a rubber elastic body and integrally molded into a sheet to form a stair snow melting mat, which is installed in the ascending / descending direction of the stairs, It has been proposed that a heating element is located at the step portion of the stairs, and a cutout portion is provided in advance so that the rising portion of the staircase has a shape without the heating element.

In the above-mentioned two inventions, the tread surface of the stair step portion is not considered at all when it is worn or cracked or damaged due to long-term walking use. Sometimes it is necessary to replace all heating elements. In addition, in order to avoid electric leakage, electric shock, etc. due to damage to the protective layer due to wear, etc.
No. 388 is characterized in that the voltage applied to the heating element is 30V.

In Japanese Utility Model Application Laid-Open No. 58-94704, the heating element is L-shaped, and the outside is covered with a thermosetting resin reinforced with glass fibers molded into an L-shape as a protective layer to be integrated. The shape to be proposed is proposed. In this case, the glass fiber reinforced thermosetting resin corresponding to the tread of the step portion is
Since the wear resistance is superior, the wear due to walking is generally small, but the wear also occurs during long-term use, and in that case, it is necessary to completely replace the heat-generating element together with the heat-generating element. Further, a material having a high surface hardness is generally difficult to use because it also has a drawback that it is slippery.

[0006]

As described above, in the conventional snow-melting heating element installed in the step portion of the stairs, the protective layer on the tread surface is worn or cracked by walking and cannot be used as a heating element. In this case, there is a drawback that the entire element including the heating element must be replaced.

[0007]

In order to make up for this drawback, the side of the coating layer portion of the heating element, which is the tread surface, has two layers with an intermediate layer interposed, and the outermost layer portion has good slip resistance. Depending on the structure, a covering material having an appropriate elasticity is used so that only the surface layer portion can be peeled and replaced very easily when damage such as wear or cracks due to walking occurs.

That is, the step-by-step snow-melting heating element of the present invention is a heating element comprising a sheet-like heating element having an electrically insulating coating and protective layers covering both front and back surfaces of the heating element. As two layers of a first protective layer and a second protective layer,
It is characterized in that an intermediate layer is provided between the two layers so as not to slip between the two layers but to facilitate peeling.

Specifically, for example, the sheet-like heating element has an electric insulation coating formed on the front and back sides of a rubber or fiber reinforced rubber asphalt sheet, and the rubber or rubber on the side facing the tread surface of the stair step portion. An intermediate layer in which inorganic particles of 10 to 3000 μm are dispersed is formed on the surface of the asphalt sheet, and a rubber or rubber asphalt sheet is further laminated on the upper layer and pressure-bonded. By doing so, when the uppermost layer, which is the tread surface, is worn or cracked due to walking, it is possible to easily peel off and replace only the upper layer with the intermediate layer as the boundary. it can. Therefore, the heating element can be used for a long period of time.

The intermediate layer is a layer that does not slip between the first and second protective layers, that is, the lower layer and the upper layer, but facilitates peeling. The constituent material of the intermediate layer is the layer in which the inorganic particles are dispersed. In addition, a thin plate made of metal, plastic, wood or the like having a large number of irregularities on the front and back, or a plastic film or sheet-like material having pressure-sensitive adhesive applied to both front and back surfaces, the same effect as the above layers can be obtained. Can be demonstrated.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail below with reference to the embodiments shown in the drawings. FIG. 1 is a conceptual diagram showing a state where the staircase snow-melting heating element of the present invention is installed on a staircase. The planar heating elements 11 are individually arranged on the upper surface of step ST and are continuously bound by a lead wire for energization. There is. FIG. 2 is a plan view of the heating element of the present invention installed on the stairs, showing a state in which a plurality of strip-shaped heating elements 11 cover the main area of the step ST surface. FIG. 3 is a partially cutaway perspective view of the sheet heating element 11, showing a sheet heating element 12 having an electrically insulating coating and first and second protective layers 6 and 7 for protecting and waterproofing the sheet heating element 12. Indicates a heating element. FIG. 4 is a partial vertical cross-sectional view of the staircase snow melting heating element of the present invention installed on step ST, showing two types of intermediate layers 8, in which the inorganic particulate matter 8 a is provided on the first protective layer 6. An intermediate layer 8 made of a thin plate (plate-like material) 8b made of metal, plastic or wood having unevenness on the scattered layers or the front and back is stacked, and the second protective layer 7 is stacked on the upper surface thereof.

As the heating element 12 incorporated in the heating element for step snow melting of the present invention having the above structure, for example, a semiconductive coating material is applied on a plastic sheet or film having a high insulation resistance value as a base material. Of the semiconductive sheet 1 and the sheet-like heating element 12 provided with the electrode 2 and the insulating coating 5 thereon, or carbon black or metal powder is mixed in advance in a synthetic resin to form a film or sheet. The sheet-like heat generating element 12 in which an electrode and an insulating coating are formed is formed, or the sheet-like heat generating element 12 in which a woven cloth or a non-woven fabric is made of carbon fiber and which is provided with an electrode and an insulating coating.

Among the heating elements 12 described above, it is preferable to use a polyolefin resin such as polyethylene or polypropylene filled with conductive metal fine particles such as carbon black or copper to impart semiconductivity. Since the heating element 12 having the semiconductive sheet 1 formed into a sheet or a film by using a different processing machine exhibits a so-called PTC characteristic in which its electric resistance value has a positive temperature coefficient, it is heated by electric current. Since the electric resistance value of the element increases with the start of and the temperature rise accompanying it, the self-suppressing action of heat generation works,
It is particularly preferable because it is easy to control the temperature during heating.

The electrode 2 provided on the planar heating element 12
As the material of the above, any of a tape-shaped metal foil or a braided wire of metal wires such as copper and aluminum and a twisted wire can be used, but it is preferable to use a twisted wire from the viewpoint of easy coupling with a lead wire for energization. .

As the electric insulating coating 5 constituting the above-mentioned sheet heating element 12, various thermoplastic resins or synthetic rubbers processed into a sheet or film can be used.
It is preferable to use a synthetic resin that constitutes the heating element, or a carbon fiber that exhibits good adhesion to the carbon fiber when the element is coated.

The heating element 11 of the present invention comprises the electric insulation coating 5 described above.
The first heating layer 6 and the second protection layer 7 are further formed on the sheet heating element 12 having the above-mentioned structure for the purpose of protection and waterproofing. As a material for forming these protective layers, synthetic rubber, asphalt, a mixture of both, or a material obtained by mixing an inorganic powder in the mixture is preferable. Furthermore, a so-called composite material sheet obtained by combining the above-mentioned material and a fibrous material or a film processed into a film can be used as the protective layer.

A feature of the present invention is that the protective layer on the tread side of the heating element installed on the stair step ST is the first protective layer 6
The intermediate layer 8 is composed of two layers (a lower layer) and a second protective layer 7 (an upper layer), and an intermediate layer 8 that facilitates peeling of the upper layer is formed between the two layers.

In this way, the second protective layer (upper layer) 7 is
Although it is easy to replace the replacement member when it is worn or damaged due to cracks or the like, it is preferable that both layers are made of the same material. Furthermore, the tread surface of the second protective layer 7 is adhesive. It is more preferable that the surface layer portion is made of a mixture of rubber or plastic chip-like pulverized material, wood, inorganic material or other granular material so as not to exhibit properties.
When the second protective layer 7 is made of a material different from that of the first protective layer 6, for example, a cement mortar layer having a rough tread surface is also suitable.

The thickness of the coating forming the second protective layer 7 is preferably as thick as possible in consideration of the life of the pedestrian until it is replaced due to wear and damage, but if it is too thick, the heat transfer effect is reduced or the existing structure is used. A thickness of 3 to 10 mm is preferable because it gives a pedestrian a feeling of strangeness on the stairs and makes the walking unstable.

The intermediate layer 8 provided between the first protective layer 6 and the second protective layer 7 facilitates peeling of the first layer and the second layer, but also has a function of preventing lateral displacement between them. It is a layer that has. The intermediate layer 8 has an average particle size of 10 to 3000 μm,
Preferably, crushed powder (granular material) 8a made of an inorganic material is sprayed on the surface of the first protective layer 6 at an appropriate density. Second
The protective layer 7 is formed by stacking the protective layer 7 on the intermediate layer 8 and pressure-bonding the both. By doing so, the crushed powder bites into both the first protective layer 6 and the second protective layer 7, and it becomes a state in which a large number of shavings are struck between them, so that the above-mentioned function is exhibited. Other materials that can be used for the intermediate layer 8 include a plate-shaped material made of metal or plastic having a large number of irregularities on the front and back surfaces, a plastic film coated with an adhesive on the front and back surfaces, and a sheet-shaped material having the same function. Can be used as shown. When the second protective layer 7 is a cement mortar layer, the intermediate layer 8 is
A metal plate having irregularities or a plastic sheet coated with an adhesive is suitable.

[0021]

[Effect] When the snow melting heating element for stairs of the present invention as described above is used, it is possible to prevent snow accumulation and icing on the stepped portion of the staircase structure in a snowy area, so that pedestrians can step off the stairs, slip and fall. It is possible to prevent personal injury and wear of the upper protective layer of the tread due to frequent walking,
When the damage occurs, it is possible to replace only the tread side second protective layer 7 of the heating element very easily without replacing the entire heating element, and for a long period of time, the heating element is used for staircase snow melting. It is economical because it can be used, and it is effective because it can broaden the range of choice of tread material that requires slip prevention.

[0022]

[Brief description of drawings]

FIG. 1 is a conceptual view of a staircase snow melting heating element according to the present invention installed in a staircase.

FIG. 2 is a plan view of a snow-melting heating element of the present invention installed on stairs.

FIG. 3 is a partially cutaway perspective view of a planar heating element.

FIG. 4 is a partial vertical sectional view of two different examples of the heating element for snow melting of the present invention installed on the stairs.

[Explanation of symbols]

 1 semi-conductive sheet 2 electrode 3 connection with energizing lead wire caulking metal fitting 4a energizing lead wire 4b energizing main wire 5 electrical insulating coating 6 first protective layer 7 peelable second protective layer 8 intermediate layer 8a intermediate layer Powdery substance to be formed 8b Plate-like substance having irregularities to form an intermediate layer ST Stair step part

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display area E04H 9/16 H H05B 3/14 F 7512-3K 3/34

Claims (6)

[Claims] 1. A planar heating element having an electrically insulating coating,
In a step snow melting heating element comprising protective layers covering both front and back surfaces, the protective layer on the tread side of the heating element is a two-layer structure including a first protective layer and a second protective layer, and the two layers are formed between the two layers. A heating element for snow melting in stairs, characterized by having an intermediate layer that does not slip but facilitates peeling. 2. The average particle diameter of the intermediate layer is 10 to 3000 μm.
2. The stairs according to claim 1, which is a film or sheet obtained by applying a pressure-sensitive adhesive to the plate-like material such as metal, plastic, or wood having a large number of irregularities on the scattering layer or the front and back surfaces of the granular material. Heating element for snow melting. 3. The planar heating element is a semiconductive sheet formed by molding a mixture obtained by kneading carbon black in a thermoplastic polymer into a sheet or a film. Alternatively, the heating element for staircase snow melting described in 2. 4. The intermediate layer has an average particle size of 10 to 3000 μm.
The heating element for snow melting in stairs according to claim 1, which is a dispersion layer of the inorganic particulate matter. 5. The heating element for step snow melting according to claim 1, 2, 3 or 4, wherein the second protective layer is a rubber or rubber asphalt layer. 6. The heating element for step snow melting according to claim 1, 2 or 3, wherein the second protective layer is a cement mortar layer.