JP5161049B2 - Electric floor heating panel and wooden substrate for electric floor heating panel - Google Patents

Description

  The present invention relates to an electric floor heating panel provided with a cord-like heater and a wooden substrate constituting the electric floor heating panel.

  An electric floor heating panel in which a cord-like heater is wired on the back surface of a wooden substrate is known (see Patent Document 1). When manufacturing the electric floor heating panel, a wiring groove for wiring the cord heater is formed on the back surface of the wooden base material, and the cord heater is embedded in the wiring groove. In order to facilitate the embedding work, the width of the wiring groove is the same as the diameter of the cord heater to be embedded in the wooden base material used in an actual electric floor heating panel. Just by pushing the cord heater, the cord heater is fixed in the groove by a frictional force.

  In the electric floor heating panel of the above-mentioned form, when a load is applied from the upper surface of the electric floor warming panel after being constructed as a floor heating structure, a slight warping is projected downward in the long side direction of the wooden substrate. Occurs. When many sound insulation grooves parallel to the short side are formed on the wooden base material for the purpose of improving the sound insulation function, or when cushioning material is pasted on the back surface of the wooden base material for the purpose of improving walking feeling, etc. In this case, the amount of warpage becomes large.

  The cord heater wired in the wiring groove also bends downward in the long side direction following the behavior of the wooden base material. Conventionally, since the cord heater is wired so that it fits in the wiring groove including the U-turn part, the cord heater wired in the straight part of the wiring groove curves downward in the long side direction. Then, in the U-turn portion, the inner wall surface serves as a resistance point, and a tensile stress is generated in the cord heater.

  A wooden base material and an electric floor heating panel that can avoid the occurrence of tensile stress in the cord-like heater due to warping of the wooden base material are described in Patent Document 1, in which FIG. ), The groove width Wb of the U-turn portion 53b of the wiring groove 53 formed on the back surface of the wood substrate 50A is made wider than the groove width Wa of the linear portion 53a, and the inner wall surface 57 of the U-turn portion 53b is In the arc shape, the outer wall surface 58 of the U-turn portion 53b is formed by a curved portion R1, a straight portion L, and a curved portion R2. The cord-shaped heater 54 having a diameter d is wired along the outer wall surface 58 in the U-turn portion.

  In the electric floor heating panel of this embodiment, as shown in FIG. 6A, a gap S having a required width exists between the inner wall surface 57 of the U-turn portion 53 b and the cord-like heater 54. Therefore, even when the cord-shaped heater 54 is deformed due to warping of the wooden base material, the deformation is absorbed by the gap S as shown in FIG. There is an advantage that it is possible to avoid the stress in the pulling direction from acting on the heater 54.

JP 2008-57280 A

  The inventors of the present invention have been working to make an electric floor heating panel by wiring the cord-like heater 54 to the wood base material 50A having the wiring groove 53 of the above-described form on the back surface. It has been found that when the wire heater 54 is wired along the outer wall surface 58 of the U-turn portion 53b, the cord heater may be lifted or returned. When lifting or returning occurs, it is necessary to correct it, and wiring work may be complicated.

  The present invention has been made in view of the above circumstances, and for an electric floor heating panel that can prevent the cord-shaped heater from being lifted or returned when the cord-shaped heater is wired in the wiring groove. It is a first problem to provide a wooden substrate. Moreover, it is set as the 2nd subject to provide the electric floor heating panel which wired the cord-shaped heater to the wooden base material.

  In order to solve the above problems, the present inventors have conducted many experiments, and as shown in FIG. 6, the shape of the outer wall surface 58 in the U-turn portion 53 b in which the gap S having the required width is present, In the case of the shape formed by the curved portion R1, the straight portion L, and the curved portion R2, when the corded heater 54 is wired along the outer wall surface 58, the bent shape of the corded heater 54 formed therein is This is different from the shape of the bent portion formed when the linear cord-like heater 54 is bent at 180 degrees in a natural state. Therefore, a large elasticity (internal stress) is formed in the bent portion of the cord-like heater 54. It was found that the above-described cord-shaped heater was lifted and returned in an attempt to release it.

  The present invention is based on the above findings, and the wood base material according to the present invention is formed on the back surface of the long wood base material in which the long side is linear and the short side is linear or birch. A wooden substrate for an electric floor heating panel in which a wiring groove for accommodating a cord-shaped heater is formed, wherein the wiring groove is a straight portion along the long side direction and the length of the wooden substrate following the linear portion. At least a U-turn portion in the vicinity of the end in the side direction, and at least the outer wall surface of the U-turn portion is naturally formed when wiring the cord-like heater continuously to the adjacent linear portion. The cord heater has a shape that matches or substantially matches the shape of the U-turn bent portion of the cord heater, and the cord heater is wired in contact with the outer wall surface of the U-turn portion. .

  In the wood base material according to the present invention, the shape of the outer wall surface in the U-turn portion of the wiring groove is such that the cord-shaped heater U formed naturally when trying to continuously wire the cord-shaped heater to the adjacent linear portion. Since the shape is the same as or substantially the same as the shape of the turn-shaped bent portion, even if the cord-shaped heater is wired along the outer wall surface of the U-turn portion, a large internal stress is formed in the bent portion. Never happen. Therefore, it is possible to reliably avoid the occurrence of lifting and returning after wiring.

  Depending on the distance between adjacent straight portions along the long side direction formed on the back side of the wooden flooring, or the physical properties of the cord-like heater used, wiring is continued to the adjacent straight portions. There are cases where the shape of the U-turn bent portion of the cord-like heater that is naturally formed when trying is different. In that case, it may be costly to produce many types of woody base material having a U-turn portion having an outer wall surface that matches or substantially matches the shape of each bent portion.

  Therefore, in one aspect of the wood substrate according to the present invention, at least the outer wall surface of the U-turn portion is a semicircular processed surface. In many cases, considering that the shape of the bent portion formed when the linear member having elasticity is bent by 180 degrees is almost semicircular, even in this aspect, the intended purpose is sufficiently achieved. Can be achieved. Further, in this aspect, when the U-turn portion of the wiring groove is formed on the wooden substrate using an NC processing machine, a processed surface other than the semicircular processed surface (for example, the U-turn portion 53b as shown in FIG. 6). The processing program capacity can be reduced as compared with the case where the outer wall surface 58 has a shape formed by the curved portion R1, the straight portion L, and the curved portion R2). It becomes.

  In one aspect of the wood substrate according to the present invention, the U-turn portion has a groove width wider than that of the straight portion. In this aspect, when the electric floor heating panel is used, it is effective that the tensile stress is generated in the cord-like heater due to the warp of the wooden base material as in the electric floor heating panel described in Patent Document 1. Can be avoided.

  The present invention is an electric floor heating panel including at least the above-described woody base material for an electric floor heating panel and a cord-like heater wired in the wiring groove thereof, wherein the cord-like heater is provided on the U-turn portion. An electric floor heating panel is also disclosed which is wired along the outer wall surface.

  For the reasons described above, when the electric floor heating panel is manufactured, it is possible to prevent the cord-shaped heater from being lifted or returned, and therefore, the manufacturing can be facilitated and speeded up. Moreover, in the aspect using the wooden base material in which the U-turn part of the wiring groove is wider than the straight part as the wooden base material, tensile stress is generated in the cord-like heater due to the warp of the wooden base material. Can be effectively avoided.

  In the present invention, the cord-like heater is a heater provided with a temperature fuse with a resistor and a detection line as described in JP-A-2008-157603, or described in JP-A-10-335046. A heater or the like combining a three-wire heater provided with such a detection line (signal line) and a temperature fuse with a resistor can also be used. An example of a usage mode of a three-wire heater provided with a temperature fuse with a resistor is described in Japanese Patent Application No. 2008-054784 to the same applicant as the present application.

  According to the present invention, when the cord heater is wired in the wiring groove formed on the back surface of the wooden substrate, it is possible to prevent the cord heater from being lifted or returned at the U-turn portion of the wiring groove. When manufacturing the floor heating panel, the operation of wiring the cord-like heater in the wiring groove can be facilitated and speeded up.

  Hereinafter, the present invention will be described based on embodiments with reference to the drawings. 1 is a plan view showing an example of an electric floor heating panel according to the present invention, FIG. 2 is a cross-sectional view taken along line II of FIG. 1, and FIG. 3 is a cross-sectional view taken along line II-II of FIG. FIG. 4 is a bottom view of the electric floor heating panel shown in FIG. 1, with the cushioning material layer removed. FIG. 5 is a diagram for explaining the relationship between the U-turn portion of the wiring groove and the cord heater in the electric floor heating panel.

  In the illustrated electric floor heating panel A according to the present invention, as shown in FIG. 2, the wood base 50A has a long unit piece 50 in which a male fruit 51 and a female fruit 52 are formed around the long side. One wooden base material 50A is assembled in the shape of an oak tree while shifting the position in the direction. That is, as shown in FIG. 1, the wood base 50 </ b> A has a long shape in which the long side is linear and the short side is an oak. Although not shown, the entire short side may be a rectangle. Each unit piece 50 is made of a composite substrate made of plywood or plywood in which an extremely thin MDF is kneaded on the surface layer, and a surface decorative material (not shown) such as a veneer or a decorative sheet is provided on the surface of each unit piece 50. Preferably they are laminated. A wiring groove 53 is formed on the back surface of each unit piece 50. As shown in FIG. 4, the wiring groove 53 mainly includes a straight portion 53a along the long side direction of the wood base material 50A, and a U-turn portion 53b in the vicinity of the end portion in the long side direction of the wood base material 50A. (A part of which is indicated by circles in FIG. 4). Depending on the place, there is a place that is a meandering part. In the illustrated example, the wiring grooves 53 are continuously formed so that there are three wiring grooves per unit piece. In addition, the wiring grooves 53 are continuous at the junction between adjacent unit pieces 50 and 50. A cord-shaped heater 54 is embedded in the continuous wiring groove 53, and the end of the cord-shaped heater 54 is electrically connected to the connectors 55 and 56.

  An example of an enlarged view of the vicinity of the U-turn portion 53b of the wiring groove 53 is shown in FIG. As illustrated, the U-turn portion 53b, that is, the groove width Wb of the curved portion is wider than the groove width Wa of the linear portion 53a of the wiring groove 53 over the entire region. In this example, the groove width Wa of the linear portion 53a of the wiring groove 53 is substantially equal to the diameter d of the cord-shaped heater 54 to be wired. Therefore, the groove width Wb of the U-turn portion (curved portion) 53b is the cord-shaped heater over the entire area. It is larger than the diameter d of 54. By increasing the groove width Wa of the linear portion 53a of the wiring groove 53 to about 1.1 to 1.3 of the diameter d of the cord-like heater 54 to be wired, wear due to wear of the cord-like heater 54 can be avoided. Even in this case, the groove width Wb of the U-turn portion 53b is set wider than the groove width Wa of the linear portion 53a over the entire area. Although not shown in the drawing, the depth of the wiring groove 53 is the same in all of the straight portion 53a and the U-turn portion 53b, and is substantially the same as the diameter d of the cord heater 54.

  In the example shown in FIG. 5, the shape of the inner wall surface 57 of the U-turn portion 53 b in a plan view is a semicircular machining surface, and the shape of the outer wall surface 58 in a plan view is determined by inserting the cord heater 54 into a wiring groove. It occurs when trying to wire continuously to the two adjacent linear portions 53a, 53a of 53, that is, matches or substantially matches the shape of the U-turn bent portion 54a of the cord-like heater 54 formed naturally. It is made into a shape. In the illustrated example, the shape of the outer wall surface 58 in a plan view is a substantially semicircular machining surface, but the semicircular machining surface is one example, and the outer wall surface 58 is a plan view. The shape differs depending on the type of the cord-like heater 54 to be wired, the distance between the two linear portions 53a, 53a adjacent to the wiring groove 53, and the like.

  When the electric floor heating panel A is manufactured, the cord-shaped heater 54 is embedded in the wiring groove 53 formed on the back surface of the wooden substrate 50A. The straight line portion 53a of the wiring groove 53 is simply pushed from above. In the U-turn portion 53b, the cord heater 54 is wired so as to be in contact with the outer wall surface 58 thereof. As described above, the shape of the outer wall surface 58 of the U-turn portion (curved portion) 53 b in plan view is to wire the cord heater 54 continuously to the two adjacent straight portions 53 a and 53 a of the wiring groove 53. The cord-shaped heater 54 has a shape that matches or substantially matches the shape of the U-turn bent portion 54a of the cord-shaped heater 54, and the cord-shaped heater 54 is formed on the outer wall surface 58 of the U-turn portion (curved portion) 53b. Since the wiring is performed along the wiring, a large internal stress due to the embedding is not formed in the U-turn bent portion 54a of the cord-shaped heater 54 in the wired state. Therefore, it is possible to reliably avoid the U-turn bent portion 54a of the cord heater 54 from being lifted or returned after wiring. As a result, the wiring work of the cord heater 54 can be performed quickly and appropriately.

  Further, as described above, the groove width wb of the U-turn portion 53b is wider than the groove width wa of the linear portion 53a, that is, wider than the diameter d of the cord-like heater 54. By wiring the heater 54 to the U-turn part 53 b, a large gap S is formed between the inner wall surface 57 of the U-turn part 53 b and the cord-like heater 54. Thereby, it is possible to effectively avoid the generation of tensile stress in the cord-like heater 54 due to the warp of the wooden base material 50A.

  Further, in the illustrated example, a large number of sound insulating grooves 59 parallel to the short side of the unit piece 50 are formed on the back surface of each unit piece 50 so as to intersect the linear portion 53 a mainly of the wiring groove 53. . Although not limited, in this example, the groove width of the sound insulation grooves 59 is approximately 2 mm, and the pitch between the sound insulation grooves 59 is approximately 15 mm. By providing the sound insulation groove 59, the floor heating structure in which the electric floor heating panel A is spread can have a high sound insulation function. The sound insulation groove 59 can be omitted.

  Moreover, the buffer material 60 is affixed on the whole surface except the accommodating part of the connectors 55 and 56 on the back surface of the wooden substrate 50A. In this example, as shown in FIGS. 2 and 3, the cushioning material 60 has a two-layer configuration of a nonwoven fabric layer 61 as a cushioning material and a soft resin foam layer 62 that functions as a heat insulating material. Attached so as to face the back side of the wooden base material 50A with 62 being on the outside. Thereby, in addition to having a high sound insulation function, the floor heating structure in which the electric floor heating panel A is spread provides a high walking feeling and high heat insulation.

The top view which shows an example of the electric type floor heating panel by this invention. Sectional drawing by the II line | wire of FIG. Sectional drawing by the II-II line of FIG. The bottom view in the state which removed the shock absorbing material from the electric type floor heating panel shown in FIG. The figure which expands and shows the U-turn part vicinity of the wiring groove | channel in the electric floor heating panel by this invention. The figure which expands and shows the U-turn part vicinity of the wiring groove | channel in the conventional electric floor heating panel.

Explanation of symbols

A ... Electric floor heating panel according to the present invention,
50A ... woody substrate,
50 ... unit piece,
51 ... Yumi,
52 ... Female fruit,
53. Wiring groove,
53a ... linear part of the wiring groove,
53b: U-turn portion of the wiring groove,
54 ... Cord heater,
54a ... U-turn bent portion of the cord heater,
57 ... Inner wall surface of U-turn part,
58 ... the outer wall surface of the U-turn part,
59 ... Sound insulation groove,
60 ... cushioning material,
61 ... Nonwoven fabric layer,
62 ... Resin foam layer

Claims (4)

  An electric floor heating panel in which a wiring groove for accommodating a cord-like heater is formed on the back surface of a long wooden substrate in which the long side is linear and the short side is linear or wood The wiring groove has at least a straight portion along the long side direction and a U-turn portion in the vicinity of the end portion in the long side direction of the wooden base material that follows, and the U At least the outer wall surface of the turn portion has a shape that matches or substantially matches the shape of the U-turn bent portion of the cord heater that is naturally formed when the cord heater is continuously wired to the adjacent linear portion. The cord-like heater is wired so as to be in contact with the outer wall surface of the U-turn part.   The wooden substrate for an electric floor heating panel according to claim 1, wherein at least an outer wall surface of the U-turn portion is a semicircular processed surface.   The wood substrate for an electric floor heating panel according to claim 1 or 2, wherein the U-turn portion has a groove width wider than that of the straight portion.   An electric floor heating panel comprising at least the wooden base material for an electric floor heating panel according to any one of claims 1 to 3 and a cord-like heater wired in a wiring groove thereof, wherein the cord-like shape is provided. The electric floor heating panel, wherein the heater is wired along the outer wall surface of the U-turn portion.

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