JP2005300104A - Heating mat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heating mat capable of coping with various laying states. <P>SOLUTION: This heating mat comprises two mat-shaped non-woven fabrics (base material) 11, an electric heater wire (heat generating means) 12 mounted on faces of the non-woven fabrics 11, a laminated body (heat dispersing means) 14 mounted in a state of being kept into contact with the non-woven fabrics 11 and the electric heater wire 12 for dispersing the heat generated by the electric heater wire 12, and terminal panels 9a, 9b composed of terminals for supplying the power to the electric heater wire 12. Two non-woven fabrics 11 are rotatably connected by a rotating spindle 22 of a fitting fixed to the terminal panels 9a, 9b, further a plurality of small joists 15 are mounted on a surface of the laminated body 14, the electric heater wire 12 is mounted on the faces of the non-woven fabrics 11 in a meandering state, and the small joists 15 are arranged in a state of not overlapped to the electric heater wire 12. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electric heating mat for floor heating that heats a space on a floor board by heating the floor board.

  As a conventional electric heating mat, as described in Patent Document 1 below, one having a heater sheet laminated on a flexible substrate and a small joist laminated on the heater sheet is known. It has been.

When this electric heating mat is installed in a room for floor heating, the electric heating mat is disposed at a place where heating is desired on the base plate in the room, and the electric heating mat is fixed to the base plate with screws at the position of the small joists. The electric heating mat is smaller than the floor of the room, and when the electric heating mat is placed on the base plate, a portion where the electric heating mat is not laid remains between the edge of the electric heating mat and the wall of the room. A peripheral panel such as a plywood having substantially the same thickness as the electrothermal mat is provided in this portion. Furthermore, a floor heating apparatus is constructed by laying a floor board on the electric heating mat and the peripheral panel.
JP 2003-166720 A

  According to the conventional electric heating mat, the dimensions of the electric heating mat are set in advance corresponding to the size of a general residential room. Considering the size of the room, an electric heating mat corresponding to this can be used, an electric heating mat is laid in the room, a peripheral panel is provided around the electric heating mat, and a floor board can be laid to construct the floor heating device.

However, the electric heating mat is set according to the size of the floor of the room. Therefore, if the electric heating mat is installed in a place or direction other than its size and shape, the size of the room (size) and the size of the electric heating mat will be described. In relation to (dimension), there are limitations on the laying direction and laying position of the electric heating mat. Furthermore, since an electric heating mat corresponding to the size of the room cannot be laid in a long and narrow part like a hallway of a house, it is necessary to prepare an elongated electric heating mat for the hallway separately from the room.

  An object of the present invention is to provide an electric heating mat that can correspond to a plurality of laying configurations with one type of electric heating mat.

  In order to achieve the above object, the present invention provides a plurality of mat-like base materials, heat generating means provided on each of the base materials and capable of generating heat electrically, and contacting each base material including the heat generating means. A heat disperser that disperses the heat generated by the heat generating means, and a terminal panel that is provided on each of the bases and serves as a terminal for supplying power to the heat generating means. The base materials located mutually are connected with the rotation means which makes it relatively rotatable within a horizontal surface, It is characterized by the above-mentioned.

  By doing so, the electric heating mat is divided into a plurality of parts, and the electric heating mats (or base materials) located next to each other can be rotated relative to each other in a horizontal plane, and thus, for example, rotated by 180 degrees. The adjacent electric heating mats can be positioned so as to be adjacent in the same direction. Moreover, it can be rotated 90 degree | times within a horizontal surface, and the electric heating mat located adjacent can be located so that it may orthogonally cross. In this way, a plurality of types of laying configurations are possible depending on the size and shape of the place to be constructed.

  In addition, the electric heating mat is divided into two, and each electric heating mat (or base material) has a rectangular shape. A terminal panel is provided at one corner of each electric heating mat, and the terminal panel and the terminal panel extend to the terminal panel. The long sides can be positioned adjacent to each other. In this case, a rotation means having two rotation support shafts is used, and each rotation support shaft is rotatably fixed to each terminal panel.

  If the terminal panels are connected to each other by this rotating means, the two electric heating mats are rotated relative to each other by 180 degrees in the horizontal plane around the rotation supporting shaft so that the short sides of the two electric heating mats are adjacent to each other. can do. Or it can be rotated 90 degrees relatively in a plane, and the extended line of the long side of two electrothermal mats can be made into the state where it intersects perpendicularly. In this way, a plurality of types of laying forms are possible depending on the place of construction.

  And a plurality of small joists provided on the surface of the heat dispersing means, wherein the heat generating means are provided in a meandering manner on the surface of the substrate, and the small joists are arranged so as not to overlap the heat generating means. And good.

  By adopting such a configuration, the small joist is provided on the heat dispersion means, and therefore, when the heating floor board is stretched, the tip of the heating floor board can be provided on the small joist. In this way, the fixing position when the heating floor board is fixed with a nail or a wood screw can be clearly understood, and the heating means such as the electric heater wire is not damaged by the nail or the wood screw. Furthermore, since the joint of the heating floor board is stretched so as to be located on the small joist, the joint part of the heating floor board is not deformed such as bending or jumping up, and the floor surface without unevenness can be given. it can.

  Note that the small joists provided on the base material including the heat generating means can be provided in a lattice shape. In this way, even when the adjacent base materials are in a 90-degree positional relationship, since there is a small joist that aligns in the same direction, the front end of the heating floor plate in the longitudinal direction can be positioned on the small joist, and the heating floor plate Can be stretched.

  Further, by providing the small joists in a lattice shape, the electric heating mat can be used upside down. For example, even when the adjacent electric heating mats are in a positional relationship of 90 degrees, by providing the small joists in a lattice shape, there are small joists that are aligned in the same direction when the electric heating mat is turned upside down. The tip of the direction can be positioned on the small joists and the heating floor can be stretched.

  Further, since the heat generating means is provided in a meandering manner, the heat generated by the heat generating means is generated in a meandering manner. Since the heat dispersing means is in close contact with the heat generating means and the heat dispersing means is excellent in heat conductivity, the heat generated by the heat generating means spreads by the heat dispersing means and is uniformly and efficiently transferred to the heating floorboard.

  Next, each requirement constituting the present invention will be described in more detail. The electric heating mat of the present invention heats a heating floor board using electric energy and heats an upper space of the heating floor board. The base material is formed of a mat-like material having elasticity and compressibility and having a certain degree of heat resistance, and it is preferable to use a nonwoven fabric, a net-like sheet, paper, a perforated sheet, or the like.

  As the heating means, an electric heater wire or a planar heating element may be used. When an electric heater wire is used as the heat generating means, a heat sensitive wire (sensor wire) may be provided in the vicinity of the electric heater wire. By providing a heat sensitive wire, the temperature of the heating floor board is controlled and overheating is prevented.

  The heat dispersion means is preferably provided on the entire surface of the substrate including the heat generation means such as an electric heater wire, and disperses the heat generated by the heat generation means. As a heat dispersion means, a non-woven fabric such as spunbond, a net having a certain degree of heat resistance, a metal sheet or metal foil having heat conductivity and flexibility, such as copper foil or aluminum foil, etc. It is a sheet-like material sandwiched between layers and has some compressibility.

  Adhesive when sticking the heat generating means to the base material, or the adhesive when sticking the heat dispersion means to the base material or the metal thin plate or metal foil in the heat dispersing means itself between two sheets or the surface of the sheet As an adhesive (synthetic resin) to be attached to the substrate, for example, vinyl acetate, vinyl acetate / acrylic, ethylene / vinyl acetate, acrylic / ethylene, urethane, or the like may be used.

  The terminal panel is provided for connecting the heating means and the electric wiring outside the electric heating mat. When the base material has a rectangular shape, the terminal panel is preferably provided at the corner of the terminal panel. Furthermore, it is good to connect by the rotation means which can rotate the adjacent terminal panel. As the rotating means, a known fitting such as a hinge, a hinge and a bendable elastic member can be used.

  The small joist is to transmit the load applied to the heating floor plate to the floor base material, and is fixed on the heat dispersion means at a position not overlapping with the heat generation means, but the shape is not particularly limited. In general, an elongated or strip-like plate or a rod-like material is used.

  Small joists are made of wood such as plywood, wood board, wood fiber board (MDF, etc.), wood chipboard, single board laminated board, etc., synthetic resin, metal board such as iron, copper, aluminum alloy, It can also be used for shapes.

  According to the present invention, the electric heating panel is divided into a plurality of parts, and can be turned by a turning means provided between the terminal panels so as to have a shape suitable for the place to be constructed. It can correspond to multiple laying forms.

  Hereinafter, embodiments of the electrothermal mat according to the present invention will be described in detail with reference to the drawings. 1 to 10, the same or equivalent parts are denoted by the same reference numerals.

  FIG. 1 is a perspective view showing a floor heating apparatus using the electric heating mat of Example 1 in the electric heating mat according to the present invention, excluding a part of the heating floor plate. The floor heating apparatus H heats a heating floor board using electric energy and heats a room. That is, the electric heating mats 1a and 1b installed on the surface of the floor base material (not shown), and the peripheral panel 10 provided on the surface of the floor base material between the electric heating mats 1a and 1b and the surroundings of the room, These electric heating mats 1a and 1b and the heating floor plate 2 laid on the peripheral panel 10 are provided. A peripheral floor board 18 is provided at both ends of the heating floor board 2.

  Furthermore, the electric heating mats 1a and 1b are laid in close contact with the bottom of the heating floor board 2, and the heating floor board 2 is heated to heat the space on the heating floor board. Moreover, the electric heating mats 1a and 1b are compressed in a state where the heating floor board 2 is laid, and become the same as the peripheral panel 10, for example, 3 mm thick.

  The thickness of the heating floor board 2 is selected to be 9 mm, for example. The heating floor plate 2 is laid in a direction orthogonal to the small joist 15 (described later), and the joint 2 c at the longitudinal end is laid so as to be positioned on the small joist 15.

  Further, the floor heating device H includes a controller 4, and an electric heating mat side cable 20 laid in the cable receiving groove 24 from the terminal panels 9 a and 9 b provided on the electric heating mats 1 a and 1 b, and a controller drawn from the controller 4. A side cable 5 is connected via a connector 6. A power cord 7 for supplying power is connected to the controller 4.

  The power cord 7 may be used as it is connected to the controller 4, but a plug 8 is attached to the power cord 7, and the power cord 7 is temporarily used for a current test of the electric heating mats 1a and 1b. Then, when the energization test is completed, the power cord 7 may be removed, and power may be wired between the controller 4 and a distribution board (not shown). The electric control of the electric heating mats 1a and 1b is on / off, heating intensity, overheating prevention, leakage prevention, and other heating reservations.

  FIG. 2 is a plan view showing the electrothermal mat of the first embodiment. The electric heating mats 1a and 1b include electric heater wires (heating means) 12 provided on the surface of a nonwoven fabric 11 (FIG. 3) described later. The electric heater wire 12 is provided in a meandering manner on the nonwoven fabric 11. Furthermore, it is provided with terminal panels 9 a and 9 b that are provided on each nonwoven fabric 11 and serve as terminals for supplying electric power to the electric heater wires 12. The electrothermal mat 1 a and the electrothermal mat 1 b are connected by a connection fitting (rotating means) 21. The connection bracket 21 is rotatably fixed to the terminal panels 9a and 9b, and the terminal panel 9a and the terminal panel 9b are connected to each other.

  Furthermore, each of the electrothermal mats 1a and 1b includes a plurality of small joists 15 provided on the surface of a laminate (heat dispersion means) 14 described later. The small joist 15 provided in the electric heating mat 1a and the small joist 15 provided in the electric heating mat 1b have a point-symmetrical relationship. The small joist 15 is disposed so as not to overlap the electric heater wire 12.

  FIG. 3 is a cross-sectional view showing the cross section along the line AA in FIG. 2 together with the heating floor plate and the base plate. The electrothermal mat 1a is provided on the surface of a base plate 17 made of a wood-based material such as plywood, wood board, wood fiber board (MDF, etc.). Furthermore, the electrothermal mat 1a includes a mat-like nonwoven fabric 11 having elasticity and an electric heater wire 12 attached to the surface of the nonwoven fabric 11.

  A heat sensitive wire 13 is provided along the electric heater wire 12. By controlling the heat sensitive wire 13 along the electric heater wire 12, the temperature of the heating floor board 2 is controlled and overheating is prevented. Furthermore, on the nonwoven fabric 11 including the electric heater wire 12 and the heat sensitive wire 13, a laminated body 14 for dispersing the heat generated in the electric heater wire 12 and a small joist 15 arranged on the laminated body 14 are provided. Prepare.

  The nonwoven fabric 11 is a mat-like material having elasticity, and is formed of a nonwoven fabric, a net-like sheet, paper, a perforated sheet, etc., and has a thickness of several millimeters and is sandwiched between the heating floor board 2 and the base board 17. In a compressed state, for example, the thickness is about 3 mm.

  The laminate 14 is provided on substantially the entire surface of the nonwoven fabric 11 including electric heater wires and heat sensitive wires. In the structure of the laminated body, an aluminum foil (thin plate) having thermal conductivity and flexibility is sandwiched between two sheets formed of a nonwoven fabric such as spunbond and attached with an adhesive. Examples of the adhesive for sticking the aluminum foil between the two sheets include vinyl acetate, vinyl acetate / acrylic, ethylene / vinyl acetate, acrylic / ethylene, and urethane.

  The small joist 15 is preferably made of a material that can sufficiently withstand the compressive force from the heating floor board 2, and a wood-based or synthetic resin-based material such as plywood or wood fiber board (MDF or the like) is preferably used. The cross section of the small joist 15 is a rectangular, elongated or strip-shaped plate. The small joist 15 is fixed to the base plate 17 with wood screws (screws) 16. As described above, since the nonwoven fabric 11 has elasticity, the nonwoven fabric 11 and the laminate 14 positioned under the small joist 15 are compressed, and the thickness of the electrothermal mat 1a including the small joist 15 is approximately 3 mm. It becomes.

  The base plate 17 is supported by the joists 26. A heat insulating material 27 such as polystyrene foam is preferably provided between the joists 26. This reduces the amount of heat dissipated under the floor and improves the heating efficiency.

  A heating floor board 2 is laid on the electric heating mat 1a. The heating floor board 2 is made of a wood system such as a plywood board, a wood fiber board (MDF, etc.), a wood chip board, and a single board laminated board, and its surface is a decorative surface. As the size of the heating floor board 2, for example, a width 303 mm × a length 1818 mm × a thickness 9 to 12 mm is selected. Further, the heating floor board 2 is fixed to the base board 17 through the small joists 15 using nails 34.

  A male fruit 2a and a female fruit 2b are formed at the joint position of the heating floor board 2. 3 illustrates the electric heating mat 1a, the electric heating mat 1b has the same structure as the electric heating mat 1a, and the small joist 15 is a material that can sufficiently withstand the compressive force from the heating floor board 2. Therefore, the description is omitted.

  4 is a plan view of the electric heating mat in FIG. 2 in a state in which the right electric heating mat is rotated 180 degrees. The electric heating mat 1a and the electric heating mat 1b are connected to each other by a connection bracket 21 such that the terminal panel 9a and the terminal panel 9b are connected to each other so as to be rotatable by a rotation support shaft provided on the connection fitting 21. By rotating the electric heating mat 1b on the right side by 180 degrees, a vertically long electric heating mat shape in which the small joists 15 are oriented in the same direction can be obtained.

  FIG. 5 is a plan view showing a state in which the electric heating mat shown in FIG. 2 is laid in the approximate center of the room. FIG. 6 is a plan view showing a state where the electric heating mat shown in FIG. 2 is laid on the right side of the room. The electric heating mats 1a and 1b of the present embodiment can be installed by being rotated by the connection fitting 21 according to the size and shape of the room and the place where heating is desired. In the floor heating apparatus using the electric heating mats 1a and 1b of the present invention, a peripheral panel is provided on the base plate 17 between the four peripheral edges of the electric heating mats 1a and 1b and the wall edge of the room.

  The peripheral panel is formed of a partial panel that has substantially the same thickness as the electrothermal mats 1a and 1b and is divided into a plurality of parts. And the clearance gap T is provided between the electric heating mats 1a and 1b and the partial panel adjacent to this, and between partial panels. The size of the gap T is about 3 mm.

  The floor heating device H is constructed by laying a heating floor plate 2 (not shown) on the electric heating mats 1a, 1b and a peripheral floor plate 18 (not shown) on the peripheral panel 10. For the heating floor board 2 and the peripheral floor board 18, for example, a wood system such as a plywood board, a wood fiber board (MDF, etc.), a woodcut piece board, and a single board laminated board is used. In this case, the surface of the floor board is a decorative surface. As the size of the heating floor board 2 and the peripheral floor board 18, for example, a width of 303 mm × a length of 1818 mm × a thickness of 9 to 12 mm is selected.

  FIG. 7 is a plan view showing a form in which the electrothermal mats 1a and 1b of the present invention are laid in a room having a kitchen. If the electric heating mats 1a and 1b of the present embodiment are used, the electric heating mats 1a and 1b formed in a shape close to a square shape in the living room or the living room are formed in a vertically long shape along the front of the kitchen 35. The formed electrothermal mats 1a and 1b can be provided. Reference numeral 36 denotes a sliding door.

  The electrothermal mats 1a and 1b according to the first embodiment having the above structure operate as follows. That is, in FIG. 1, the terminal panels 9a and 9b are connected by the connection fitting 21 in a state where the long sides of the electric heating mats 1a and 1b are adjacent to each other, and from this state, the electric heating mat 1a, 1b is rotated 180 degrees in the plane and the short sides of the electric heating mats 1a and 1b are adjacent to each other, or 90 ° is rotated in the plane and the extended lines of the long sides of the electric heating mats 1a and 1b are orthogonal to each other. Depending on the place of construction, multiple types of laying configurations are possible.

  Further, since the small joist is provided on the laminate 14, it can be confirmed when the heating floor board 2 is stretched, and the position where the heating floor board 2 is fixed when the heating floor board 2 is fixed with a nail or a wood screw can be clearly seen. Neither electric heater wires nor heat-sensitive wires are damaged by wood screws. Furthermore, since the joint of the heating floor board 2 is stretched so as to be located on the small joist 15, the joint part of the heating floor board 2 is not deformed such as bending or jumping up, and a floor surface without unevenness is formed. Can be given.

  Furthermore, since the electric heater wire 12 is provided in a meandering manner, the heat generated by the electric heater wire 12 is produced in a meandering manner. Since the laminate 14 is in close contact with the electric heater wire 12 and the laminate 14 is excellent in thermal conductivity, the heat generated in the electric heater wire 12 spreads in a planar shape and is uniformly and efficiently transferred to the heating floor plate 2.

  In addition, in the electrothermal mat of Example 1, the front and back can be turned over and used. In FIG. 3, when the front and the back are turned over, the small joist 15 is on the lower side (the base plate 17 side), so the small joist 15 cannot be seen from the surface. Therefore, a mark indicating the position of the small joist 15 or a mark indicating a position where a nail or a screw is provided may be provided on the surface of the substrate 11 by printing or the like. By doing so, the nail and the screw do not damage the electric heater wire and the heat sensitive wire.

  Further, the small joists of the electric heating mats 1a and 1b may be provided in a lattice shape. By providing the small joists in a lattice shape, the degree of freedom in the direction in which the heating floor board 2 is stretched is further expanded.

  FIG. 8 is a plan view showing the electrothermal mat of the second embodiment. Similar to the electric heating mat of the first embodiment, the electric heating mat 1a and the electric heating mat 1b of the second embodiment are connected to each other by a connection fitting (rotating means) 21 between the terminal panel 9a and the terminal panel 9b. The connection bracket 21 is fixed so that the rotation support shaft 22 can rotate with respect to the terminal panels 9a and 9b. The electric heating mat 1a and the electric heating mat 1b are connected to each other by the rotation support shaft 22 provided on the connection fitting 21. It is pivotally connected.

  Furthermore, the electrothermal mat 1 a includes a plurality of small joists 15 provided on the surface of the laminate 14. The electric heating mat 1 b includes a small root joist 23 in addition to a plurality of small joists 15 provided on the surface of the laminate 14. Here, the small joist 15 provided in the electric heating mat 1a and the small joist 15 provided in the electric heating mat 1b have a point-symmetrical relationship. The small joist 15 is disposed so as not to overlap the electric heater wire 12.

  Further, the small joist 15 and the small joist 23 provided in the electric heating mat 1b are orthogonal to each other and are provided in a lattice shape. When the heating floor board (symbol 2) (not shown) is stretched in the state shown in FIG. 8, the heating floor board 2 is stretched in a direction perpendicular to the small joists 15 and the heating floor board 2 in the longitudinal direction. The tip is positioned on the small joist 15.

  FIG. 9 is a plan view of the electric heating mat shown in FIG. 8 with the right electric heating mat 1b rotated 90 degrees. Since the small joist 15 and the small joist 23 of the electric heating mat 1b are formed in a lattice shape, the small joist 15 of the electric heating mat 1a and the small joist 23 of the electric heating mat 1b are parallel even if the electric heating mat 1b is rotated 90 degrees. Can be arranged. Since the heating floor board 2 can be stretched in a direction orthogonal to the small joists 15 and 23 and the longitudinal ends of the heating floor boards 2 can be positioned on the small joists 15 and 23, warping and unevenness of the heating floor boards 2 can be prevented. It rarely occurs.

  Furthermore, the electrothermal mat of Example 2 can be used with the front and back turned upside down. Since the small joist 15 and the small joist 23 of the electric heating mat 1b are formed in a lattice shape, even if the electric heating mats 1a and 1b are turned upside down, the small heating rod 15 of the electric heating mat 1a and the small heating rod 23 of the electric heating mat 1b are It is parallel to the same direction, can be provided in a direction orthogonal to the heating floor board 2, and the heating floor board can be laid. 8 and 9, the small joists of the electrothermal mat 1a may be provided in a lattice shape. The other structures and operations in FIGS. 8 and 9 are the same as those of the electrothermal mat of the first embodiment shown in FIGS.

  FIG. 10 is a plan view showing an example of the shape of the connection fitting in the electrothermal mat according to the present invention. 10A shows a rectangular shape of the terminal panels 9a and 9b, FIG. 10B shows a circular shape of the terminal panels 9a and 9b, and FIG. 10C shows a shape of the terminal panels 9a and 9b. Has a triangular shape, and the design of the terminal panel can be refined.

  The present invention has been described in detail with reference to the illustrated embodiments. However, the present invention is not limited to the embodiments, and various modifications can be made without departing from the spirit of the present invention. It goes without saying that various modifications can be made.

  The electric heating mat of the present invention can be used for heating a room of an apartment house or an individual house, or for a business room such as an office, a barber shop, or a beauty salon.

The electric heating mat which concerns on this invention WHEREIN: The floor heating apparatus which uses the electric heating mat of Example 1 is shown, and it is a perspective view of the state which removed a part of heating floor board. 1 is a plan view showing an electrothermal mat of Example 1. FIG. FIG. 3 is a cross-sectional view showing a cross section along line AA in FIG. FIG. 3 is a plan view of the electric heating mat in FIG. 2 in a state where the right electric heating mat is rotated 180 degrees. It is a top view of the state which laid the electric heating mat shown in FIG. 2 in the approximate center of the room. FIG. 3 is a plan view of a state where the electric heating mat shown in FIG. 2 is laid on the right side of the room. It is a top view which shows the form which lays the electric heating mat of this invention in the room which has a kitchen. 6 is a plan view showing an electrothermal mat of Example 2. FIG. FIG. 9 is a plan view of the electric heating mat shown in FIG. 8 with the right electric heating mat rotated 90 degrees. In the electrothermal mat according to the present invention, it is a plan view showing an example of the shape of the connection fitting.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a, 1b Electric heating mat 2 Heating floor board 9a, 9b Terminal panel 11 Nonwoven fabric (base material)
12 Electric heater wire (heating means)
14 Laminate (heat dispersion means)
15, 23 Koneta 21 Connecting bracket (turning means)
22 Rotating spindle

Claims (2)

  A plurality of mat-shaped base materials, heat generating means provided on each of the base materials and capable of generating heat electrically, and heat generated by the heat generating means provided in contact with each base material including the heat generating means. Heat dispersion means for dispersing, and a terminal panel provided on each of the base materials and serving as a terminal for supplying power to the heat generating means, and the plurality of base materials are adjacent to each other in a horizontal plane. An electrothermal mat that is connected by a rotating means that is relatively rotatable.   A plurality of small joists provided on the surface of the heat dispersing means, wherein the heat generating means are provided in a meandering manner on the surface of the base material, and the small joists are arranged so as not to overlap the heat generating means. The electrothermal mat according to Item 1.

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