JP2021050884A - Electric foot warmer - Google Patents

Abstract

To provide an electric foot warmer that makes it easy to operate a temperature adjusting knob and never increases in cost, without increasing a vertical length of a heater unit.SOLUTION: A heater unit 10 is provided with a protective cover 9 for preventing a user from directly touching an electric heater 5 during use, the protective cover 9 consists of side faces 9A which are substantially in a quadrangular shape in bottom face view, and consist of successive four faces in a flat plate shape, and a protective cover body 9B which is coupled with those side faces 9A to form a bottom face and has vent holes, and in a region including one of the four sides of the protective cover 9, a fitting face 9AC in a flat plate shape formed by bending a lower part of an extension face 9AB formed by extending downward a part of one side face 9AA among the side faces 9A of the protective cover 9 and three side faces 9BA formed by folding the protective cover body 9B upward form a fitting recessed part SS which has the lower part and the part of one side face recessed upward. In this fitting recessed part SS, a part of a temperature adjusting knob 21 is housed and arranged, and the temperature adjusting knob 21 is operated from below.SELECTED DRAWING: Figure 1

Description

The present invention relates to an electric kotatsu in which a heater unit provided with an electric heater for heating the inside of the heating space is attached to a storage space at the center of a main body formwork in which the outer circumference is formed into a rectangular shape and assembled into a well girder.

Conventionally, in this type of electric kotatsu, the length of the heater unit in the vertical direction is sufficiently secured without reducing the space for warming and so that the user's legs do not hit the heater unit. (Thickness) tends to be shortened. For this reason, the lower part of the frame body constituting the main body formwork collides with the temperature control knob provided so as to project outward from the side surface of the heater unit, which interferes with the temperature control knob. A notch recess was purposely formed at a portion of the frame body constituting the main body formwork corresponding to the temperature control knob (see, for example, Patent Documents 1 and 2).

Japanese Unexamined Patent Publication No. 6-2862 JP-A-2018-185073

Therefore, as described above, since the temperature control knob is provided on the side surface of the heater unit, there is a problem that it is difficult for the user to operate the knob, and the frame body constituting the main body formwork has a problem. Since the notch recess is purposely formed at the portion corresponding to the temperature control knob, the cost is high.

Therefore, in view of the above points, the present invention provides an electric kotatsu that facilitates the operation of the temperature control knob without increasing the vertical length of the heater unit, and at the same time, does not increase the cost. The purpose is.

Therefore, the first invention is an electric kotatsu in which a heater unit equipped with an electric heater for heating the inside of the heating space is attached to a storage space in the center of the main body formwork assembled into a girder with a rectangular outer circumference. hand,
A protective cover is provided on the heater unit to prevent the user from directly touching the electric heater during use.
The protective cover has a quadrangular shape when viewed from the bottom, and is composed of a flat plate-shaped continuous four-sided side surface and a protective cover body having ventilation holes connected to these side surfaces to form a bottom surface.
A mounting recess is formed in the lower part of the protective cover body, and all or a part of the temperature control knob is housed and arranged in the mounting recess so that the user can operate the temperature control knob from below. It is characterized by.

The second invention is an electric kotatsu in which a heater unit equipped with an electric heater for heating the inside of the heating space is attached to a storage space in the center of the main body formwork assembled into a girder with a rectangular outer circumference. ,
A protective cover is provided on the heater unit to prevent the user from directly touching the electric heater during use.
The protective cover has a substantially quadrangular shape when viewed from the bottom, and is composed of a flat plate-shaped continuous four-sided side surface and a protective cover body having ventilation holes connected to these side surfaces to form a bottom surface.
A mounting recess is formed in a portion including one of the four sides of the protective cover, and a part of the lower portion and the side portion thereof is recessed upward, and all or a part of the temperature control knob is placed in the mounting recess. It is characterized in that it is stored and arranged so that the user can operate the temperature control knob from below.

Further, the third invention is an electric kotatsu in which a heater unit provided with an electric heater for heating the inside of the heating space is attached to a storage space in the central part of the main body formwork assembled into a girder with a rectangular outer circumference. ,
A protective cover is provided on the heater unit to prevent the user from directly touching the electric heater during use.
The protective cover has a substantially quadrangular shape when viewed from the bottom, and is composed of a flat plate-shaped continuous four-sided side surface and a protective cover body having ventilation holes connected to these side surfaces to form a bottom surface.
A flat plate-like shape in which the lower part of an extension surface obtained by extending a part of one side surface of the side surface of the protective cover downward at a portion including one side of the four sides of the protective cover is bent inward at a right angle. The mounting surface and the three side surfaces of the protective cover body bent upward form a mounting recess in which a part of the lower portion and the side portion thereof is recessed upward, and all of the temperature control knobs are formed in the mounting recess. Alternatively, a part of the temperature control knob is stored and arranged so that the user can operate the temperature control knob from below.

According to the present invention, it is possible to provide an electric kotatsu that facilitates the operation of the temperature control knob without increasing the vertical length of the heater unit, and at the same time, does not increase the cost.

It is a front view of the electric kotatsu which is the part of the kotatsu comforter hung on the electric kotatsu in the vertical section. It is an electric circuit diagram of an electric kotatsu. It is a perspective view of a heater unit (only a part of the mesh-like expression is used). It is a top view of an electric kotatsu seen from below. It is an enlarged view of the main part of FIG. FIG. 5 is a cross-sectional view taken along the line AA of FIG. It is a partially enlarged front view of the electric kotatsu which shows the temperature control mechanism by the dial type temperature control knob operation. It is a partially enlarged front view of the electric kotatsu which shows the temperature control mechanism by the slide type temperature control knob operation. It is a partially enlarged front view of the electric kotatsu which shows the temperature control mechanism by the slide type temperature control knob operation. The figure which shows the temperature control mechanism by the slide type temperature control knob operation is the partially enlarged front view of the electric kotatsu. It is a perspective view of the heater unit which adopted the other dial type temperature control knob (the mesh-like expression is only a part).

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 7. First, in FIG. 1, reference numeral 1 denotes an electric kotatsu, which is placed substantially in the center of a kotatsu mattress 4 or the like laid on a tatami mat that serves as a floor surface to provide warmth. In this electric kotatsu 1, the heater unit 10 is in contact with the lower surface of the top plate 3 which forms the top surface of the storage space in the center of the main body form 2 assembled into a well girder with a rectangular outer circumference, and the heater unit 10 is bolted or the like ( The heater unit 10 is equipped with a blower that blows air sucked from below in the horizontal direction radially, an electric heater 5 having a U-shape when viewed from the bottom, a bimetal thermostat 18 described later, and the like. In this case, the blower does not necessarily have to be provided.

Then, the heating space S is formed by supporting the main body formwork 2 on the floor surface by the support legs 6 arranged at the four corners of the main body formwork 2. Further, a table plate 8 is placed on the upper part of the main body formwork 2 via a kotatsu comforter 7 that covers the outside of the support legs 6. Then, in order to prevent burns or the like from directly touching the electric heater 5 when the user puts his / her feet or body in the heating space S of the electric kotatsu 1, the electric kotatsu 1 has a large number of ventilation holes. A mesh-shaped protective cover 9 is provided on the heater unit 10. The shape of the ventilation hole is a rhombus shape, but the shape is not limited to this shape and may be another type of shape.

In FIGS. 1 and 2, 11 is a power supply line for supplying power to the electric heater 5, and one power supply line 11 is connected to a power plug 16 for connecting to a power outlet 15 of a commercial power supply of AC100V and the electricity. An operation start / stop switch that is connected to the terminal block 12 of the heater unit 10 provided with the heater 5 and the like, and the other power line 11 is connected to the power plug 16 and is operated by the user provided in the controller 14. It is connected to the terminal block 12 via 13.

In the heater unit 10, the electric heater 5, a thermal fuse 17 connected in series with the electric heater 5, a bimetal thermostat 18 connected in series with the thermal fuse 17, and the like are arranged. The bimetal thermostat 18 can be adjusted so that the operating temperature differs depending on the user, and adjusts the temperature of the heating space S. The temperature fuse 17 is blown and energized when the electric heater 5 is abnormally heated. It shuts off.

As shown in FIGS. 3 to 6, the protective cover 9 has a square shape (for example, a substantially square shape) when viewed from the bottom surface, and has four continuous flat side surfaces 9A having no ventilation holes and these side surfaces 9A. It is composed of a mesh-like protective cover body 9B having ventilation holes forming a bottom surface connected to the above.

Then, a mounting recess SS having a certain depth is formed in a portion including one of the four sides of the protective cover 9 having a quadrangular shape when viewed from the bottom, with a part of the lower portion and the side portion recessed upward. .. The central portion of the side surface 9AA of one of the four side surfaces 9A of the mounting recess SS is extended downward to form an extension surface 9AB, and the lower portion of the extension surface 9AB is bent inward at a right angle. It is composed of a flat plate-shaped mounting surface 9AC having no pores and three side surfaces 9BA obtained by bending the mesh-shaped protective cover body 9B upward. Of the three side surfaces 9BA, the opposite side surface 9BA1 has a substantially triangular shape so as to become narrower toward the outside. Each of these side surfaces 9BA is formed by bending the protective cover body 9B upward so as to form an angle of about 45 degrees.

The extension surface 9AB may be integrally manufactured with the one side surface 9AA by extending the central portion of the one side surface 9AA of the four side surfaces 9A downward from the beginning, or later. The extension surface 9AB may be attached to the one side surface 9AA by welding or the like.

Further, in the state where the heater unit 10 is attached to the electric kotatsu 1, the protective cover body 9B has a rounded cross-sectional shape such that the central portion protrudes most downward when viewed from the bottom surface. As described above, the mounting recess SS is formed.

Then, as shown in FIGS. 3 and 7 showing the first embodiment of the temperature control knob, the temperature control knob 21 arranged in the protective cover 9 via the opening 9AD opened in the mounting surface 9AC. A part of the above protrudes into the mounting recess SS. The temperature control knob 21 is used so that the operating temperature of the bimetal thermostat 18 in the heater unit 10 is different via the temperature control mechanism in order to adjust and set the temperature (heating temperature) in the heating space S. It can be adjusted by rotating it from below.

The bimetal thermostat 18 has a shape in which two metal plates having different coefficients of thermal expansion are laminated, and when the temperature exceeds a certain temperature set by the rotation operation of the temperature control knob 21, the metal on one side is curved. The contact is disconnected and the state is turned off. By rotating the temperature control knob 21, the opening / closing temperature of the contact can be adjusted by the degree of pressing against the bimetal. For example, in FIG. 7, when the temperature control knob 21 is rotated clockwise and stopped at the limit position, the maximum temperature (for example, the temperature of the bimetal thermostat 18 is 100 ° C.) is set, and conversely, in the heating space S. When setting to lower the temperature, if the temperature control knob 21 is also rotated counterclockwise and stopped at the limit position, the minimum temperature (similarly 60 ° C.) is set, and the range between the two limit positions is set. The temperature can be set within. In FIG. 7, the temperature control knob 21 is set to a high set temperature when it is rotated clockwise, but conversely, when it is rotated clockwise, it is set to a low set temperature and when it is rotated counterclockwise. It may be set to a high set temperature.

Then, when the bimetal thermostat 18 reaches the higher set temperature, the electric heater 5 is turned off (OFF) and the electric heater 5 is de-energized, and when the bimetal thermostat 18 reaches the lower set temperature, the electric heater 5 is turned on (ON). Is energized.

As can be seen from FIGS. 1 and 6, as described above, the above is in a state of being in contact with the lower surface of the top plate 3 forming the top surface of the storage space in the central portion of the main body formwork 2 assembled in the grid. The heater unit 10 is attached, but the height dimension of the main body formwork 2 is slightly longer than the height dimension of the one side surface 9AA of the side surface 9A of the attached heater unit 10, and the height dimension of the one is slightly longer than the height dimension of the one side surface 9AA. The lower end of the side surface 9AA is located above the lower end of the main body formwork 2, and is shorter than the total height dimension of the one side surface 9AA and the extension surface 9AB. By shortening the height dimension of the main body form 2 or increasing the height dimension of all the side surfaces 9A or at least the one side surface 9AA, the main body is made larger than the height dimension of the main body form 2. The height dimension of the one side surface 9AA of the heater unit 10 attached to the formwork 2 is slightly longer so that the lower end of the one side surface 9AA is located below the lower end of the main body formwork 2. It may be. Then, the lower end portion of the extension surface 9AB9AB is bent inward at a right angle to form the mounting surface 9AC, whereby the mounting recess SS is formed by the mounting surface 9AC and the three side surfaces 9BA.

Therefore, the temperature control knob 21 and the cover 22 for protecting the portion of the power line 11 connected to the terminal block 12 are housed in the mounting recess SS. Become.

Due to the above configuration, the temperature control knob 21 can be operated from below without increasing the length of the heater unit 10 in the vertical direction (height direction), which makes it easier to operate. At the same time, it is possible to provide an electric kotatsu that does not increase the cost. That is, conventionally, since the temperature control knob 21 is provided on the side surface of the protective cover 9, there is a problem that it is difficult for the user to operate, and the temperature control knob 21 of the main body form 2 has a problem. Since it was necessary to form a notch recess in the corresponding portion, the cost was high, but such a problem can be solved.

Here, the operation of the electric kotatsu 1 will be briefly described. First, the power plug 16 is connected to the power outlet 15 of the commercial power source, and the controller 14 is operated so that the user operates in the normal operation mode. When the operation start / stop switch 13 is operated to turn on, power is supplied to the electric heater through the operation start / stop switch 13, the bimetal thermostat 18, and the thermal fuse 17, and the electric heater is energized. The inside of the heating space S is heated by the electric heater 5.

Then, when the inside of the heating space S is warmed by the electric heater 5, when the set temperature (for example, 100 degrees) is reached, the bimetal thermostat 18 is opened, the electric heater 5 is de-energized, and the electric heater 5 is de-energized. The heating in the heating space S will be stopped. Then, when the inside of the heating space S cools down due to the stop of heating and reaches a set temperature (for example, 60 degrees), the bimetal thermostat 18 is closed, and as described above, the electric heater 5 is energized. , The inside of the heating space S will be warmed. Similarly, the operation will be repeated.

Although the temperature control knob 21 described above is a dial type, a slide type temperature control knob 21A as shown in FIG. 8 may be used, and the temperature is controlled via a temperature control mechanism. That is, the temperature control knob 21A is provided on the rack 23 (they may be integrated from the beginning or may be mounted and fixed later), and the knob 21A may be mounted and fixed later through the opening 9AE opened in the mounting surface 9AC. The pinion 24 is rotated via the rack 23 by sliding the temperature control knob 21A, which is partially projected from above into the mounting recess SS and stored, in the lateral direction, and the temperature control knob 21A is stored from below. The opening / closing temperature of the contacts is adjusted by the degree of pressing against the bimetal by sliding operation.

Further, a slide type temperature control knob 21B as shown in FIG. 9 may be used, and the temperature is controlled via the temperature control mechanism. That is, the temperature control knob 21B is provided on the first connecting body 25A (the two may be integrated from the beginning or may be attached and fixed later), and the first connecting body 25A is formed. An opening opened in the mounting surface 9AC by fixing the two connecting bodies 25B (the two may be integrated from the beginning or may be mounted and fixed later) to the belts 27 stretched on both pulleys 26 and 26. The belt 27 is rotated by sliding the temperature control knob 21B, which is stored by projecting a part of the portion 9AE from above into the mounting recess SS, in the lateral direction, and the temperature control knob is rotated from below. The opening / closing temperature of the contact is adjusted by the degree of pressing against the bimetal by the slide operation of 21B.

Further, the slide type temperature control knob 21C as shown in FIG. 10 may be used, and the temperature is controlled via the temperature control mechanism. That is, the temperature control knob 21C is provided on the first connecting body 28A (the two may be integrated from the beginning or may be attached and fixed later), and the second connecting body 28A is formed. A wire 30 is stretched between the pulleys 29 and 29 and the pulleys 31 provided on the connecting bodies 28B and 28B (they may be integrated from the beginning or may be attached and fixed later). The wire 30 is rotated by sliding the temperature control knob 21C, which is housed by projecting a part of the opening 9AE from above into the mounting recess SS through the opening 9AE opened in the mounting surface 9AC, in the lateral direction. The opening / closing temperature of the contact is adjusted by the degree of pressing against the bimetal by sliding the temperature control knob 21C from below.

Further, the temperature control knob 21 according to the first embodiment described above is a dial type and is operated by vertical rotation in the vertical direction. However, as shown in FIG. 11, temperature control in horizontal rotation is performed. The picking 21D may be used. In this case, when the temperature control knob 21D is viewed from below, it is set to a high (or low) set temperature when it is rotated clockwise, and it is set to a low (or high) set temperature when it is rotated counterclockwise. Is set to.

In the embodiments shown in FIGS. 8 to 10, when the temperature control knobs 21A, 21B, and 21C that can be moved in the left-right direction within a certain range are moved to the left, the set temperature is set higher and the right direction is set. When it is moved to, the set temperature is set lower, but when it is moved to the right, the set temperature is set higher, and when it is moved to the left, the set temperature may be set lower.

As described above, the mechanism for adjusting the set temperature is not limited to the present invention regardless of its structure and method, but a part of the temperature control knob is stored and arranged in the mounting recess SS. Even if it is (the rest of the temperature control knob is stored inside the protective cover 9), the entire temperature control knob may be stored and arranged in the mounting recess SS.

Although the embodiments of the present invention have been described above, various alternative examples, modifications or modifications can be made to those skilled in the art based on the above description, and the present invention has the above-mentioned alternative examples, modifications or modifications without departing from the spirit of the present invention. It includes deformation.

1 Electric kotatsu 5 Electric heater 9 Protective cover 9A Side surface 9B Protective cover body 9AA Side surface 9AB Extension surface 10 Heater unit 18 Bimetal thermostat 21, 21A, 21B, 21C, 21D Temperature control knob SS mounting recess

Claims (3)

An electric kotatsu in which a heater unit equipped with an electric heater that warms the inside of the heating space is attached to the storage space in the center of the main body formwork, which is assembled into a rectangular shape around the outside.
A protective cover is provided on the heater unit to prevent the user from directly touching the electric heater during use.
The protective cover has a quadrangular shape when viewed from the bottom, and is composed of a flat plate-shaped continuous four-sided side surface and a protective cover body having ventilation holes connected to these side surfaces to form a bottom surface.
A mounting recess is formed in the lower part of the protective cover body, and all or part of the temperature control knob is housed and arranged in the mounting recess so that the user can operate the temperature control knob from below. An electric kotatsu featuring. An electric kotatsu in which a heater unit equipped with an electric heater that warms the inside of the heating space is attached to the storage space in the center of the main body formwork, which is assembled into a rectangular shape around the outside.
A protective cover is provided on the heater unit to prevent the user from directly touching the electric heater during use.
The protective cover has a substantially quadrangular shape when viewed from the bottom, and is composed of a flat plate-shaped continuous four-sided side surface and a protective cover body having ventilation holes connected to these side surfaces to form a bottom surface.
A mounting recess is formed in a portion including one of the four sides of the protective cover, and a part of the lower portion and the side portion thereof is recessed upward, and all or a part of the temperature control knob is placed in the mounting recess. An electric kotatsu that is stored and arranged so that the user can operate the temperature control knob from below. An electric kotatsu in which a heater unit equipped with an electric heater that warms the inside of the heating space is attached to the storage space in the center of the main body formwork, which is assembled into a rectangular shape around the outside.
A protective cover is provided on the heater unit to prevent the user from directly touching the electric heater during use.
The protective cover has a substantially quadrangular shape when viewed from the bottom, and is composed of a flat plate-shaped continuous four-sided side surface and a protective cover body having ventilation holes connected to these side surfaces to form a bottom surface.
A flat plate-like shape in which the lower part of an extension surface obtained by extending a part of one side surface of the side surface of the protective cover downward at a portion including one side of the four sides of the protective cover is bent inward at a right angle. The mounting surface and the three side surfaces of the protective cover body bent upward form a mounting recess in which a part of the lower portion and the side portion thereof is recessed upward, and all of the temperature control knobs are formed in the mounting recess. Alternatively, an electric kotatsu is characterized in that a part of the kotatsu is stored and arranged so that the user can operate the temperature control knob from below.

Images