JPS6323634B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a seat heater that is attached to a vehicle seat or the like to heat the seat.

Structure of conventional example and its problems As shown in Figs. 1 and 2, this type of conventional seat heater has string-like heating heaters 2 arranged in a zigzag pattern around a core 1 made of polyester nonwoven fabric or the like. The outer fabric 3 coated with a hot-melt adhesive is bonded to both sides of the core body 1 by heat pressing or the like to form a seat heater body 4, and a part of the seat heater body 4 is , the thermostat 5 is set so as to directly sense the heat of the seat heater heating section 4'.
A lead wire 6 is connected to the thermostat 5 and the heating heater 2, and a connection plug 7 is connected to the end of the lead wire 6 to be connected to a power source (not shown) of an automobile or the like. It is set up and configured.

As shown in FIG.
are installed on each.

As shown in FIG. 4, the seat heater main body 4 is installed by inserting it between a pad 9 made of urethane foam and a cushion material 10 made of urethane foam. Note that 11 is the skin of the seat.

In the conventional configuration described above, the thermostat 5 that detects the temperature of the heating heater 2 and controls energization/de-energization of the heater 2 is attached to the seat heater body 4. case,
The thermostat 5 hits the user with a rough feeling, and as a result, when the user sits on the seat 8, the thermostat 5 makes the user feel like a foreign body.

In order to eliminate this foreign body feeling, the seat 8 and the human body do not come into contact when the user sits on the seat 8, that is, the part where the seat part 8a and the backrest part 8b of the seat 8 overlap, or the part where the user sits on the seat 8. However, in these cases, the characteristics of each seat vary depending on the shape of the seat 8 and variations in the volume of the cushion material 10 and pad 9, so it is difficult to It is necessary to set the temperature of thermostat 5 corresponding to seat 1.

In addition, there is a method in which the thermostat 5 senses the ambient temperature of the seat, but in this method, if a cushion, thick seat cover, clothing, etc. are left on the seat 8 while the seat heater body 4 is on, the seat heater is activated. There was a risk that the main body 4 would be kept warm and heated to a dangerous temperature.

Purpose of the Invention In view of the above-mentioned problems of the conventional art, the present invention has been developed so that the user does not feel a foreign body when sitting on the seat, and the heating heater is kept in a stable state without depending on the shape or condition of the seat. can be controlled with,
Furthermore, the purpose is to provide a safe seat heater.

Structure of the Invention In order to achieve the above object, the present invention provides a thermostat that controls a heating heater and a heater that heats the thermostat, which are attached to a support base and covered with a covering material, so that the thermostat can be directly connected to the heating heater. A control device that exhibits almost the same temperature characteristics as when installed is separated from the heating heater section.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail based on FIGS. 5 to 9. Note that in FIGS. 5 to 9, the same parts as in FIGS. 1 to 4 shown in the conventional example are given the same numbers, and only the points that are different from the conventional example will be explained.

That is, in this embodiment, as shown in FIG. A connection plug 7 is provided in the section. The connecting plug 7 is removably attached thereto, and a control device 12 is provided which stops energizing the heating heater 2 when the temperature of the heating heater 2 exceeds a set temperature. Further, a connection plug 28 is provided at the end of the lead wire 23 led out from the control device 12, and is detachably attached to the connection plug 7 led out from the seat heater main body 4. Further, the connection plug 29 of the lead wire 23 is detachably attached to a power supply connection plug 30 which is connected in advance from a vehicle or the like. This control device 12 is shown in FIGS.
As shown in the figure, a support base 22 made of synthetic resin has a hole 22a for insertion into the thermostat 14.
Next, a heater 15 for heating the thermostat, which is constructed by thermocompressing a string-like heater 15a with a cloth body 16 made of non-woven fabric or the like and a flame-retardant cloth body 17, is adhered, and then one side of the hole 22a of the support base 22 is attached. Then, the thermostat 14 having the temperature sensing portion 13 is inserted into the hole 22a of the support base 22, facing the heater 15 for thermo-heating. Further, a heater wire 15a led out from a heater 15 for heating the thermostat and the thermostat 14 are connected by lead wires 23, 24, and 25.

Next, the above assembly is pushed through the covering material 19 having a square hole 19a for inserting the support stand 22,
Furthermore, a case 2 made of synthetic resin is covered with a covering material 18 from above and below, and has brim surfaces 20a and 20b around the entire circumference.
0 and 21 are mated together. In this manner, the collar surfaces 20a and 20b of the mated cases 20 and 21 are brought together, and the entire circumference is welded by means such as high frequency welding. At this time, case 20, 2
The lead wire 23 is led out from approximately the center of one side of the flange surfaces 20a, 20b. Further, a tube 27 for protecting the lead wire and the connection plugs 28 and 29 are connected to this lead wire 23.

FIG. 8 shows a circuit diagram of the seat heater, in which the control device 12 connects two thermostats 14 in series, and controls each thermostat 1.
A heater 15 for heating the thermostat is arranged so as to come into contact with the temperature sensing part 13 of No. 4, and the heater 15 for heating the thermostat and the heater 2 for heating
are connected in series via the connection plugs 27 and 28, respectively. Note that the pair of heating heaters 2 and thermo-heating heater 15 are connected in parallel.

The seat heater 31 attached to the seat 8a of the seat 8 is thermally connected to a thermostat 14 and a heater 15 for heating the thermostat.
The backrest seat heater 32, which corresponds to the unit 33 and is attached to the backrest 8b of the seat 8, corresponds to the unit 34 of the other thermostat 14 and thermostat heater 15. In the control device 12, the temperature increase characteristic of the thermostat 14 is determined by the heat capacity and heat retention state of the thermostat 14 and the surroundings surrounding the thermostat 14.

This embodiment is designed to obtain a temperature characteristic in which on-off is always repeated at a constant time t, as shown in FIG. 9B. That is, T in FIG. 9 is the set temperature, and A shows the characteristics when the time from the temperature rise until the thermostat 14 reaches the set temperature and turns off is short. Because the electricity is applied for a short time, the sense of warmth is impaired. In addition, C in Fig. 9 shows the characteristics of the thermostat 14 that does not operate at low temperatures; in this case, it takes time to reach the set temperature, and the normal state in which electricity is turned on to the heating heater 2 continues. , it's too hot. According to experiments, from a practical standpoint, for example, in the case of a vehicle, when the outside temperature is around -20℃, it will last for 30 minutes or more.
The results show that sufficient warmth can be obtained by turning on the electricity for about an hour.

In order to obtain such characteristics, the thermostat 14 is provided with a support base 22 having a heat capacity to further increase the heat capacity, the temperature is gradually increased with an appropriate capacity of the heater 15, and the heat is insulated with an appropriate covering material 18, 19. This can only be achieved by creating a heat transfer state that exhibits almost the same temperature characteristics as when a thermostat is directly attached to a heating heater. If it is only the heat capacity of thermostat 14,
The characteristics will be as shown in FIG. 9A, and if the heater capacity is not appropriate, the characteristics will be as shown in A or C.
Furthermore, if the covering materials 18 and 19 are not appropriate, the characteristics shown in C will result. Heat capacity can be determined by the product of weight and specific heat, but in experiments, the combined weight of thermostat 14 and support stand 22 was 20 to 25 g.
is appropriate, the heater 15 should be about 1W to 2W, and the thickness of the urethane foam covering materials 18 and 19 should be about 8 to 15W.
By stacking three sheets of about 1.0 mm diameter, we obtained a control device that showed just the right temperature characteristics, and the characteristics shown in Fig. 9 (b), which is the heat transfer state of the direct detection method, were obtained.

In this embodiment, the control device was installed on the underside of the seat (not shown), but the present invention does not particularly limit the installation location of the control device, and it can be installed in a place where the user does not feel a foreign body sensation when seated. Anywhere is fine.

According to the present embodiment, the following effects can be obtained due to the above-described configuration.

(a) Since the control device 12 is separated from the heating heater 2 and the thermostat 14 is not installed in the seat together with the heating heater 2 as in the past, the user feels less of a foreign body when sitting on the seat. do not have.

(b) It is no longer necessary to set the temperature of the thermostat 14 for one seat, and there is no need to set the temperature of the thermostat 14 for one seat.
is on, the cushion or thick seat cover,
Even if clothes, etc. are left behind and the two heating heaters become warm, the thermostat 14 will surely turn off the electricity after a certain period of time, preventing dangerous conditions such as abnormal overheating or burnout. It can be prevented.

(c) Since two thermostats 14 are connected in series, current flows through two stages of thermostats 14, making it possible to construct a double safety circuit.

(d) Heater 2 and two thermostats 14 attached to the seat 8a and back 8b of the seat 8
are connected in series, and the respective heating heaters 2 are connected in parallel.
Since the heater 15 for heating the thermostat is connected in series with each heating heater 2,
Even if one of the heating heaters 2 is disconnected for some reason and the thermostat 14 does not operate, the other one will operate normally and there will be no danger of abnormal overheating or burnout.

(E) In the unlikely event that the control device 12 breaks down, maintenance can be easily performed by removing the connection plugs 7 and 28.

Effects of the Invention As is clear from the above configuration, the present invention is capable of controlling the heating heater without causing any foreign body sensation caused by the thermostat when the user is seated, and without being dependent on the shape or condition of the seat pad skin. To provide a safe and highly reliable seat heater that is kept warm by clothes, blankets, cushioning materials, etc. on the seat and does not overheat the seat to a dangerous temperature even when energized.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a conventional seat heater, Fig. 2 is a sectional view taken along line A-A' in Fig. 1, Fig. 3 is a perspective view of a seat equipped with the same seat heater, and Fig. 4 is the same as Fig. 5 is a perspective view of a seat heater showing an embodiment of the present invention; FIGS. 6a and b are side views of the control device; and FIG. FIG. 7 is an exploded perspective view of the control device, FIG. 8 is an electric circuit diagram, and FIG. 9 is a temperature and time characteristic diagram of the seat heater. 2... Warming heater, 4... Seat heater body, 6... Lead wire, 7... Connection plug, 8...
Vehicle seat, 8a... Seat part, 8b... Backrest part, 12... Control device, 13... Temperature sensing part, 14...
...Thermostat, 15... Heater for heating the thermostat, 18, 19... Covering material, 20, 21
……Case.

Claims (1)

[Claims] 1. A heating heater provided in a seat, a thermostat for controlling the heating heater, and a heater for heating the thermostat and thermally connected to the thermostat, The heater is mounted on a support stand and covered with a covering material to form a control device that exhibits almost the same temperature characteristics as when the thermostat is directly attached to the heating heater, and this control device is separated from the heating heater. A seat heater characterized by being arranged outside the seat.