JP2008067850A - Seat heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the probability of breakage of a conductive warp 20 on a backrest side of a vehicle sheet. <P>SOLUTION: Since an amount of deflection on the backrest side is larger in comparison with an amount of deflection on the opposite side of the backrest of a cushion member 11, the conductive warp 20 on the side of the backrest bends considerably as a person is seated, while the conductive warp 20 are arranged so that the backrest side is more dense than the other side. Thus, the conductive warp 20 can reduce the probability of breakage of the conductive warp 20 on the backrest side in comparison with a case in which warp are arranged at equal intervals between the backrest side and the opposite side of the backrest. A non-conductive weft 24 are arranged so that they stride over the conductive warp 20 on the backrest side and the conductive warp 20 on the opposite side of the backrest. Therefore, differences in temperature between the backrest side and the opposite side of the backrest is reduced. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a seat heater that warms a seat surface of a chair.

Conventionally, it is a heat generating sheet woven from a plurality of conductive warps that generate heat when energized and non-conductive wefts that are electrically insulated from the plurality of conductive warps (see, for example, Patent Document 1).
JP-A-6-295780

  When this inventor earnestly examined applying the above-mentioned exothermic sheet to a chair with a backrest and heating a seat surface of a chair, the following problems were found.

  That is, when one sits on the seat surface of the chair, most of the weight of the seat surface is applied to the backrest side (that is, the buttocks side), and when a person sits on the chair, as shown in FIG. The deflection amount (L2 in the figure) on the backrest side is larger than the deflection amount (L1 in the figure) on the opposite back side (knee side). For this reason, it was found that the conductive warp on the backrest side is large and bent each time the occupant is seated, so that the conductive warp on the backrest side is easily broken.

  An object of this invention is to provide the seat heater which reduced the probability that the electrically conductive thread | yarn of the backrest side will break in view of the said point.

  In order to achieve the above object, in the present invention, a plurality of conductive warp yarns that generate heat when energized and a plurality of non-conductive weft yarns electrically insulated from the plurality of conductive warp yarns are woven with a backrest. In the seat heater that heats the seat surface of the chair, the plurality of conductive warps are arranged so that the anti-back side is denser than the back side, and the non-conductive wefts are the conductive warp on the back side. It is arranged so that it may straddle the conductive warp on the backrest side.

  Here, the anti-backrest side is the opposite side of the backrest (that is, the knee side) with respect to the seating surface.

  According to the above, since the plurality of conductive warp yarns are arranged so that the anti-backrest side is denser than the backrest side, the probability that the conductive warp yarns on the backrest side are disconnected can be reduced.

  Further, since the plurality of conductive warps are arranged so that the anti-back side is denser than the back side, temperature unevenness may occur between the back side and the anti-back side. That is, the temperature on the anti-backrest side is higher than the temperature on the backrest side.

  On the other hand, in the present invention, the plurality of non-conductive wefts are arranged so as to straddle the back-side conductive warp and the anti-back-side conductive warp. For this reason, since a plurality of non-conductive wefts can transmit the heat generated from the backrest side to the backrest side, occurrence of temperature unevenness between the backrest side and the anti-backrest side can be suppressed.

  The second feature of the present invention is that each of the plurality of non-conductive wefts has a thin metal wire.

  Here, since the conductive thin metal wire generally has excellent heat conductivity, heat from the conductive warp on the anti-back side can be transferred well to the back side through a plurality of non-conductive wefts. , Temperature unevenness can be further reduced.

  The present invention is arranged between any two conductive warp yarns among a plurality of conductive warp yarns so as to be electrically insulated from the plurality of conductive warp yarns and to intersect with a plurality of non-conductive weft yarns. A third feature is that a non-conductive warp yarn is provided.

  In this case, since the heat from the conductive warp is transferred to the non-conductive warp through the non-conductive weft, the temperature between the two conductive warps can be increased as compared with the case where the non-conductive warp is not provided.

  In the present invention, the plurality of non-conductive weft yarns and the non-conductive warp yarns are the same type of yarn material as the plurality of conductive warp yarns, and each of the plurality of conductive warp yarns is supplied with power from the power supply device and is energized. The fourth feature is that the plurality of non-conductive weft yarns and non-conductive warp yarns are not connected to the power supply device.

  This makes it possible to divide the same type of thread material into a non-conductive weft, a non-conductive warp, and a plurality of conductive warps. Therefore, since the sheet heater can be manufactured using a common thread material as the non-conductive weft, the non-conductive warp, and the plurality of conductive warps, the manufacturing cost can be reduced.

  1 and 2 show an embodiment of a vehicle seat to which the seat heater of the present invention is applied. FIG. 1 is a view of the vehicle seat as viewed from above, and FIG. 2 is a view of the vehicle seat as viewed from the horizontal direction.

  The vehicle seat of this embodiment is comprised from the seat cushion 10 and the backrest 15 (seat back), and the seat cushion 10 supports a passenger | crew's buttocks. The backrest 15 is disposed behind the vehicle with respect to the seat cushion 10. The backrest 15 is formed in a substantially flat shape and supports the back of the occupant.

  Hereinafter, the structure of the seat cushion 10 will be described. FIG. 3 is a view showing a cross section of the seat cushion 10.

  The seat cushion 10 includes a cushion member (seat pad) 11 made of an elastic material such as sponge, and a skin member 12 disposed so as to cover the cushion member 11 from above. The skin member 12 forms a seating surface 12a that contacts the occupant's buttocks. A seat heater 13 is disposed above the cushion member 11, and the seat heater 13 is sandwiched between the skin member 12 and the cushion member 11. The seat heater 13 is a sheet-like electric heater that warms the occupant's buttocks through the skin member 12.

  As shown in FIG. 1, the seat heater 13 is woven from seven conductive warp yarns 20, 17 non-conductive warp yarns 22, and 24 non-conductive weft yarns 24. In FIG. 1, a state in which the conductive warp yarn 20, the nonconductive warp yarn 22, and the nonconductive weft yarn 24 are seen through is shown.

  The conductive warp 20 is composed of, for example, a metal fine wire made of a twisted copper nickel wire having a diameter of 30 μm and an electrically insulating coating layer formed of plasticized polyvinyl chloride or the like so as to cover the outer periphery of the metal fine wire. The electrically insulating coating layer electrically insulates between the conductive warp 20 and the nonconductive warp 22 and electrically insulates between the conductive warp 20 and the nonconductive weft 24.

  As shown in FIG. 1, the conductive warp yarns 20 are arranged parallel to the backrest 15 and in a ladder shape, and the conductive warp yarns 20 are arranged at predetermined intervals as shown in FIG. Has been.

  Here, the intervals L12 (= 80 mm), L23 (= 75 mm), L34 (= 50 mm), L45 (= 40 mm), L56 (= 40 mm), L67 (= 30 mm) range from the backrest side to the anti-backrest side, In order, the length becomes shorter (L12> L23> L34> L45> L56> L67). Thus, the conductive warp 20 is arranged so that the anti-back side is denser than the back side. Moreover, the anti-backrest side is the opposite side (the person's knee side) to the backrest 15 with respect to the seat surface 12a (seat cushion 10).

  Here, as shown in FIG. 3, one end of the conductive warp 20 is connected to the positive terminal of the power supply device via a common lead wire 30. The other end of the conductive warp 20 is connected to the negative terminal of the power supply device via a common lead wire 30. The power supply device is a power supply device that generates power from a vehicle battery and generates a constant voltage.

  The non-conductive warp 22 is a thin metal wire such as a twisted copper nickel wire having a diameter of 30 μm, for example, and is arranged so as to be parallel to the conductive warp 20 and to fill the intervals L12, L23, L34, L45, L56, and L67. Has been devised.

  For example, the five nonconductive warp yarns 22 are arranged at the interval L12, and the four nonconductive warp yarns 22 are arranged at the interval L23. The three nonconductive warp yarns 22 are arranged at the interval L34, and the two nonconductive warp yarns 22 are arranged at the interval L45. The two nonconductive warp yarns 22 are arranged at the interval L56, and the one nonconductive warp yarn 22 is arranged at the interval L67.

  The non-conductive weft 24 is a fine metal wire such as a twisted copper nickel wire having a diameter of 30 μm, for example, and the non-conductive weft 24 intersects the conductive warp 20 and the non-conductive warp 22 to provide a conductive warp 20 on the backrest side. Are arranged so as to straddle the conductive warp 20 on the opposite side of the backrest.

  Next, the operation of the vehicle seat of this embodiment will be described.

  First, when power is supplied to the power supply device, current flows from the positive terminal of the power supply device to each of the conductive warps 20 through the common lead wire 30, and the current from the conductive warp yarn 20 passes through the common lead wire 30 to the negative electrode of the power supply device. Flows to the side terminal. At this time, each conductive warp 20 generates heat when energized. Along with this, heat generated from the conductive warp 20 on the anti-back side is transmitted from the anti-back side to the back side through the non-conductive weft 24. On the other hand, heat is transmitted to the non-conductive warp yarn 22 through the intersection with the non-conductive weft yarn 24, and this heat is transmitted to the non-conductive weft yarn 24 over the entire length. Then, heat from the conductive warp yarn 20, the non-conductive warp yarn 22, and the non-conductive weft yarn 24 is transmitted to the butt of the occupant through the skin member 12.

  According to the present embodiment described above, the amount of deflection on the backrest side of the cushion member 11 is larger than the amount of deflection on the anti-backrest side (knee side). However, the conductive warp 20 is arranged so that the backrest side is denser than the backrest side. For this reason, the conductive warp yarn 20 can reduce the probability that the back warp side conductive warp yarn 20 is disconnected as compared to the case where the backrest side and the anti-backrest side are arranged at the same interval.

  Further, since the conductive warp 20 is arranged so that the anti-back side is denser than the back side, the heat amount from the conductive warp 20 on the anti-back side is larger than the heat amount from the conductive warp 20 on the back side. Become more.

  On the other hand, the non-conductive weft 24 is arranged so as to straddle the conductive warp 20 on the backrest side and the conductive warp 20 on the anti-backrest side. For this reason, the heat from the conductive warp 20 on the anti-back side is transmitted to the back side through the non-conductive weft 24. Therefore, temperature unevenness between the anti-backrest side and the backrest side can be reduced. Therefore, temperature unevenness in the crossing direction (X direction in FIG. 4) crossing the conductive warp yarn 20 can be reduced.

  In this embodiment, since the nonconductive warp yarn 22 is provided between the two conductive warp yarns 20 (intervals L12, L23... L67), heat is transmitted through the intersection with the nonconductive weft yarn 24, and this heat is It is transmitted in the longitudinal direction of the non-conductive weft 24 (Y direction in FIG. 4). Therefore, the temperature between the two conductive warp yarns 20 can be increased as compared with the case where the non-conductive warp yarns 22 are not provided between the two conductive warp yarns 20 (intervals L12, L23... L67).

  Furthermore, in this embodiment, since the conductive warp 20 is arranged so that the anti-back side is denser than the back side, the conductive warp 20 is arranged at the same interval between the back side and the anti-back side. Compared with the case where it does, the number of the conductive warp yarns 20 can be decreased.

  However, as described above, the temperature unevenness in the intersecting direction is reduced and the temperature between the two conductive warps 20 is increased. In particular, since fine metal wires are used as the non-conductive warp yarns 22 and the non-conductive weft yarns 24, heat is transmitted well over the entire lengths of the non-conductive warp yarns 22 and the non-conductive weft yarns 24, respectively. For this reason, the temperature nonuniformity of the whole seat surface 12a can be made small, and the heating performance as the seat heater 13 can be ensured.

(Other embodiments)
In the above-described embodiment, an example in which different yarn materials are used as the conductive warp yarn 20, the non-conductive warp yarn 22, and the non-conductive weft yarn 24 has been described, but instead of this, the conductive warp yarn 20, the non-conductive warp yarn 22, and the non-conductive yarn The same type of thread material may be used as the weft 24.

  In this case, as shown in FIG. 5, the conductive warp 20 is connected to the power supply device via the common cable 30, and the nonconductive warp yarn 22 and the nonconductive weft yarn 24 are not connected to the power supply device.

  This makes it possible to divide the same type of thread material into the conductive warp yarn 20, the non-conductive warp yarn 22, and the non-conductive weft yarn 24. Therefore, the seat heater can be manufactured by using a common thread material as the conductive warp yarn 20, the non-conductive warp yarn 22, and the non-conductive weft yarn 24, so that the manufacturing cost can be reduced.

  In the above-described embodiment, in order to electrically insulate between the conductive warp 20 and the non-conductive warp 22 and to electrically insulate between the conductive warp 20 and the non-conductive weft 24, an electrically insulating coating layer is used as the conductive warp 20. Although the example using what is comprised was demonstrated, not only this but the thread material which has the electrically insulating coating layer which coat | covers the outer periphery of a metal fine wire is used as the nonelectroconductive warp 22 and the nonconductive weft 24 It may be.

It is a top view of the vehicle seat in one embodiment of the present invention. It is a side view of the vehicle seat of FIG. It is sectional drawing of the seat cushion of the vehicle seat of FIG. It is the figure which showed only the electrically conductive warp and the non-conductive weft in the seat heater 13 of FIG. It is a figure which shows the structure of a seat heater in the modification of one Embodiment of this invention. It is a figure for demonstrating the problem of a seat heater.

Explanation of symbols

10 ... Seat cushion, 11 ... Cushion member,
12 ... Skin member, 12a ... Seat surface, 13 ... Seat heater, 15 ... Backrest,
20 ... conductive warp, 22 ... non-conductive warp, 24 ... non-conductive weft,
30: Lead wire.

Claims (4)

In a seat heater for heating a seat surface of a chair with a backrest, which is woven from a plurality of conductive warps that respectively generate heat when energized and a plurality of non-conductive wefts that are electrically insulated from the plurality of conductive warps ,
The plurality of conductive warp yarns are arranged so that the backrest side is denser than the backrest side,
The plurality of non-conductive wefts are arranged so as to straddle the conductive warp on the backrest side and the conductive warp on the anti-backrest side. The seat heater according to claim 1, wherein each of the plurality of non-conductive wefts has a thin metal wire. Arranged between any two conductive warp yarns among the plurality of conductive warp yarns so as to be electrically insulated from the plurality of conductive warp yarns and cross the plurality of non-conductive weft yarns. The seat heater according to claim 1, wherein a non-conductive warp yarn is provided. The plurality of non-conductive wefts and the non-conductive warp are the same type of yarn material as the plurality of conductive warps,
Each of the plurality of conductive warp yarns is supplied with power from a power supply device and energized,
The seat heater according to claim 1 or 2, wherein the plurality of non-conductive wefts and the non-conductive warp are not connected to the power supply device.

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