JPH0339432Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a portable warming box suitable for use as a leisure bag, which is used to keep lunch boxes and the like warm inside an automobile when driving or the like.

[Problems to be solved by the present invention] Thermal boxes used for this type of purpose must be lightweight so that they can be easily carried, and because they are powered by the car's battery, they have low power consumption. Moreover, it is desired that it has good thermal efficiency.

From this point of view, it is conceivable to employ a surface heating element as a heat source. As is well known, the surface heating element is suitable for this purpose because it only raises the temperature to a relatively low temperature and does not require the use of any special heat-resistant material around the installation part.

It is also conceivable to make the entire box made of synthetic resin to reduce weight. However, synthetic resins are generally sensitive to heat, and even if a surface heating element raises the temperature only to a relatively low temperature as mentioned above, if it is constantly in contact with synthetic resins, thermal deformation and carbonization of the synthetic resins will inevitably occur. becomes.

[Purpose and structure of the invention] In order to meet the above requirements, this invention uses a surface heating element with excellent thermal efficiency, while at the same time making the outer bottom located at the lower level of the heating element made of synthetic resin in order to reduce weight. The purpose of this project is to provide a portable thermal box that can be used as a heat insulator.

For this purpose, an opening/closing lid is provided at the upper end opening of the rectangular cylinder formed of a heat insulating material, and a synthetic resin lower frame is fitted to cover the lower edge of the rectangular cylinder. Both ends of an arch-shaped support member are screwed to ribs integrally formed on the inner circumferential surface of the rectangular cylinder, and the surface heating element is supported on the support member via a heat insulating sheet, and the surface heating element is attached to the rectangular tube. A power connector and a pilot lamp are placed in close contact with the lower surface of the inner bottom plate with good thermal conductivity stretched over the inner bottom of the body, and a power connector and a pilot lamp are arranged around the periphery of the synthetic resin outer bottom plate with support legs formed on the lower surface. is screwed to the rib, so that the outer sole plate is attached at a distance from the surface heating element.

[Function] Since the surface heating element is placed in close contact with the lower surface of the inner bottom plate having good thermal conductivity, heat is efficiently conducted to the inner bottom plate of the rectangular cylinder body.

Since the surface heating element is supported on the arch-shaped support member through the heat insulating sheet, the outer sole plate can be attached at a distance from the heating element, and radiation of high heat by the heating element can be avoided. .

[Example] An example of the present invention will be described based on the drawings. A is a portable warming box, and the first and second
In the figure, 1 is an opening/closing lid that covers the opening at the top of the box A, and 2 is a handle attached to the top surface of the opening/closing lid 1. The outer periphery of the opening/closing lid 1 is formed by interposing foamed urethane 4 as a heat insulating material between an outer wall 3a and an inner wall 3b, and the surface of the outer wall 3a is formed of a decorative board.

Reference numeral 5 designates a rectangular cylindrical body forming the outer periphery of the portable box A, and like the opening/closing lid 1, a foamed urethane 7 as a heat insulating material is interposed between an outer wall 6a and an inner wall 6b, and the surface of the outer wall 6a is a decorative surface. It is formed in
The upper end edge 5a and the lower end edge 5b of the rectangular cylinder body 5 are formed so that the body wall thickness of a predetermined length is thinner than the body wall thickness of the intermediate portion thereof. Concave upper and lower frames 8 and 9 made of synthetic resin are fitted around the entire circumference so as to cover these. Further, a convex portion 8a projects from the tip of the upper frame 8 fitted to the upper edge 5a of the square cylinder body 5, and the outer circumferential wall of the opening/closing lid 1 responds to the opening/closing of the opening/closing lid 1. It fits into or comes out of the recess 3c formed at the lower end of.

Reference numeral 10a denotes a hinge provided on the outer circumferential surface of the connecting portion between the opening/closing lid 1 and the rectangular cylinder body 5, and 10b denotes a pair of male and female locking devices for keeping the opening/closing lid 1 closed in conjunction with the hinge.

The lower frame body 9 fitted onto the lower edge 5b of the square cylinder body 5
A rib 9a is integrally formed on the inner circumferential surface of. As shown in FIG. 3, cross-sections with a predetermined height are formed at appropriate intervals in the left and right directions in the short direction so that the plane contacts the lower surface of the substantially rectangular inner bottom 11 of the rectangular cylinder body. two substantially trapezoidal arch-shaped support members 12;
12 are arranged in parallel. The support members 12, 12 are made of metal and have elastic central portions curved in a convex shape, and both ends 12b, 12c are screwed onto the lower surface of the rib 9a with screws 13. A planar heating element 15 having a predetermined thickness is supported on the arch-shaped support members 12, 12 via a heat insulating sheet 14 made of urethane foam material. The surface heating element 15 has a surface area about 2/3 of the plane of the inner bottom 11 of the box A, and is placed at the center of the heat insulating sheet 14. Reference numeral 16 designates the inner bottom plate of the box A which is placed in close contact with the surface heating element 15 and stretched over its top surface, and is made of a metal plate with good thermal conductivity so that the heat from the surface heating element 15 can be easily conducted into the inside of the box A. . The outer peripheral edge portion forms a fin portion 16a and hangs down at a substantially right angle, and is clamped and fixed between the inner peripheral wall 9b of the lower frame body 9 and the end face of the urethane foam 7 serving as a heat insulating material. As a result, the arch-shaped support members 12, 12 elastically push up the surface heating element 15 onto the elastic curved surface 12a via the heat insulating sheet 14, and push it up onto the inner bottom plate 16.
Crimp and secure on the bottom surface.

In addition, at the corner of the peripheral edge of the outer bottom plate 17 made of synthetic resin located at the lower stage of the arch-shaped support members 12, 12, there is a power source (not shown) for a cigarette lighter connected to a battery (not shown) in the car. A power supply connector 25 for connection is provided as shown in FIG. 4, and a terminal 20 to which the end of the conducting wire 25a is adhered is fixed at a predetermined position in the center and front side. Also 2
Reference numeral 1 denotes a terminal attached to the back surface of the surface heating element 15 for electrical conduction. Reference numeral 22a is a pilot lamp for indicating that the power is on, and 22b is a pilot lamp for indicating that the power is on, and these are each attached to a part of the outer bottom plate 17, as shown in FIG. 23 is a temperature fuse, and 24 is a thermostat embedded in the surface heating element 15.

The outer sole plate 17 is located below the arch-shaped support members 12, 12 having a predetermined height.
A hollow part c is formed between the outer sole plate 1 and the outer sole plate 1.
The frame-shaped outer peripheral edge 17a of No. 7 is brought into contact with the entire circumference of the lower surface of the rib 9a, and screwed in with a screw 18 at a predetermined position. 17b is a reinforcing rib on the outer sole plate 17.
Further, reference numeral 19 denotes a rubber support leg fixed to the lower surface of the outer sole plate 17.

When using this portable thermal box A in a car, the power connector 25 is connected to the power source of a cigarette lighter (not shown) and current is applied to the bottom surface of the inner bottom plate 16 via the terminals 20 and 21. conduction to the surface heating element 15. At this time, both pilot lamps 22a and 22b are lit. As a result, the temperature of the surface heating element 15 rises, and the heat is conducted to the inner bottom plate 16 that is in close contact with the upper surface, so that the temperature inside the heat insulation box A gradually rises. When the inside of box A reaches a predetermined temperature, the thermostat 24 is activated to maintain the inside of box A at an appropriate temperature. At this time, the pilot lamp 22b lights up,
The other lamp 22a is turned off. On the other hand, in this energized state, from the surface heating element 15 to the outer sole plate 1
The heat radiated toward 7 is first blocked by the heat insulating sheet 14 on the lower surface of the surface heating element 15, and then arch-shaped support members 12, 12 having a predetermined height are placed between the sheet 14 and the outer sole plate 17. Since the hollow portion c is formed, the surface heating element 15, the outer bottom plate 17, and the lower frame body 9 can be separated from each other so as to have a space therebetween. As a result, the radiant heat directed downward from the surface heating element 15 can be completely blocked, and almost no heat reaches the outer sole plate 17 made of synthetic resin, so the outer sole plate 1
Even if 7 is made of synthetic resin, it will not deform or carbonize, and in addition, the circuit B disposed on the outer bottom plate 17
can be protected from overheating.

Please note that dry ice is placed inside the box without electricity being applied.
If you fill it with ice, you can use it as an ice box.

[Effects of the invention] As explained in the above embodiments, the portable thermal box of the invention has a double-bottomed bottom and an arch-shaped support member is placed in the hollow part, thereby reducing radiation from the surface heating element. Since heat can be further completely blocked by adding heat to the heat insulating sheet, the outer bottom plate and the lower frame at the bottom of the box can be made of synthetic resin. This makes it possible to keep the overall weight light and have excellent thermal efficiency, making it suitable for use in automobiles.
The value for cashier use can be increased.

In addition, when inspecting or replacing surface heating elements, etc., each part can be easily disassembled and taken out by simply removing the screws screwed into the ribs formed on the lower frame, making maintenance work quick. There are also benefits to be gained.

[Brief explanation of the drawing]

Figure 1 is a central longitudinal cross-sectional view of a portable thermal box.
Figure 2 is a horizontal sectional view, Figure 3 is a sectional view taken along the line X-X in Figure 2, Figure 4 is a sectional view taken along the Y-Y line in Figure 2, and Figure 5 is a sectional view taken along the line Y-Y in Figure 2.
The figure is a sectional view taken along the Z-Z line in FIG. 2. 1... Opening/closing lid, 4, 7... Insulating material (urethane foam), 5... Square tube body, 8... Upper frame body, 9... Lower frame body, 9a... Rib, 11... (square tube Torso) Inner bottom, 1
2... Arch shaped support member, 12a... Arch shaped support member curved surface, 12b, 12c... Arch shaped support member both ends, 13, 18... Screw, 14... Heat insulation sheet, 15... Planar heating element, 16...Inner bottom plate, 1
7...Outer bottom plate, 22a, 22b...Pilot lamp, 25...Power connector, A...Portable thermal box, B...Circuit, C...Hollow part.

Claims (1)

[Scope of utility model registration request] An opening/closing lid is provided at the upper end opening of the rectangular cylinder formed of a heat insulating material, and a synthetic resin lower frame is fitted to cover the lower edge of the rectangular cylinder. Both ends of an arch-shaped support member are screwed to ribs integrally formed on the peripheral surface, and the surface heating element is supported on the support member via a heat insulating sheet, and the surface heating element is inserted into the rectangular cylinder body. A power connector and a pilot lamp are placed in close contact with the lower surface of the inner sole plate with good thermal conductivity stretched on the bottom, and a power connector and a pilot lamp are arranged on the periphery of the outer sole plate made of synthetic resin with supporting legs formed on the lower surface, and the outer sole plate is 1. A portable heat-insulating box, characterized in that the outer sole plate is attached with a distance from the surface heating element by screwing to the ribs.