JP2010088568A - Foot warmer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a foot warmer which can use heat from a heater efficiently and without loss and can be used as a heating pad or a body warmer without variations in temperature. <P>SOLUTION: The foot warmer 1 includes a housing 10 the top of which is fitted with a footrest 13 having through holes 13c, a heater 20 which is arranged in the housing 10 and heats the footrest 13, a heat receiving board 30 which is arranged under the heater 20 in the housing 10 so that it can be inserted and detached, and a heat storage body 50 which is detachably attached on the lower side of the heat receiving board 30. It is so constructed that the heat storage body 50 is heated by the heat of the heater 20 through the heat receiving board 30. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a foot warmer that can warm a foot and can be used as an anchor or a warmer.

  In winter, when sitting on a chair for office work or studying, foot warmers are widely used to warm your feet.

  As a conventional foot warmer of this type, for example, the following Patent Document 1 includes a foot warmer body in which a heater is disposed, and a footrest body disposed above the foot warmer body. An electric foot warmer is disclosed. In addition, a cover such as transparent glass is provided above the heater of the foot warmer main body, and a lattice shape is provided below the upper surface of the footrest so that the foot does not directly touch the cover. There are no bars. When electricity is supplied to the heater, the heat from the heater is transmitted to the soles of the feet through a cover made of transparent glass or the like and a grid-like crosspiece so that the feet are warmed.

By the way, when the winter is particularly cold, there are cases where an anchor is used at bedtime or a warmer is put inside clothing. In recent years, as this type of anchor or warmer, a heat storage material capable of storing the temperature from the heating element and maintaining it at a predetermined temperature for a long period of time has been used. As this type of heat storage material, Patent Document 2 below discloses a gel-type heat storage material obtained by mixing a dispersion of microcapsules and a water-absorbing pigment inside a heat storage material having a melting point of 0 to 80 ° C. Yes. As the heating method, it is described that an electric heater, a microwave oven, or the like can be selected.
Japanese Utility Model Publication No. 6-64626 JP 2004-256578 A

  In the case of the electric foot warmer disclosed in Patent Document 1, when the heater generates heat, heat is diffused radially from the outer periphery thereof. However, in the above structure, only the heat moved above the heater is transferred to the footrest to warm the foot, so other heat, for example, heat moved below the heater. Has a demerit that it is wasteful and has poor thermal efficiency and is not economical.

  Moreover, the gel-like heating material described in Patent Document 2 needs to be heated in advance by an electric heater or the like, and preparation is troublesome and troublesome. Furthermore, with radiant heat from an electric heater or the like, it is difficult to uniformly heat the gel-like heat storage material without unevenness, which may cause inconvenience when used as an anchor or a warmer.

  Accordingly, an object of the present invention is to provide a foot warmer that can be used efficiently as an anchor or a warmer without temperature unevenness while being able to efficiently use heat from a heater without waste.

  In order to achieve the above object, a foot warmer of the present invention includes a housing in which a footrest portion having a through hole is formed on an upper surface, a heater disposed in the housing and heating the footrest portion, A heat receiving board that is detachably disposed below the heater in the housing; and a heat storage body that is detachably attached to a lower surface of the heat receiving board, and the heat storage body via the heat receiving board by heat of the heater. Is configured to be heated.

  According to the above invention, when the heater is heated and the foot is placed on the footrest, the heat of the heater is directly irradiated to the sole through the through hole, and the heat of the footrest heated by the heater is Heat is transferred to the body and the hot air rises and wraps around your feet, so you can warm your feet.

  Further, since the heat of the heater is transferred to the heat storage body via the heat receiving board during use as a foot warmer for warming the foot, the heat storage body can also be warmed. Therefore, it is possible to take out this heat storage body and put it inside the futon as an anchor or put it inside the clothes as a warmer. As a result, it is possible to efficiently use the heat from the heater without waste. it can. Moreover, since the heat of the heater is made uniform by the heat receiving board and is transferred to the heat storage body, the heat storage body can be heated evenly.

  In addition, dust and debris that have entered through the through holes in the footrest drop and accumulate on the heat receiving board, but by removing the heat receiving board, dust and debris are placed on the heat receiving board and removed, so Intruding dust and debris can be easily cleaned.

  In the foot warmer of the present invention, a support plate made of a metal perforated plate that supports the heater is disposed between the heater and the heat receiving board, and in the portion of the support plate where the hole is not opened, It is preferable that the heat of the heater is reflected and applied to the footrest portion, and the heat of the heater is applied to the heat receiving board through the hole of the support plate.

  According to this, it is possible to effectively distribute the heat of the heater to both the footrest and the heat receiving board, and dust and dirt that have entered the housing fall onto the heat receiving board through the holes in the support plate. , Dust and dust can be cleaned.

  In the foot warmer of the present invention, it is preferable that a metal baffle plate covering the heater with a width slightly wider than the heater is disposed above the heater. According to this, since the heat of the heater is diffused by the baffle plate and irradiated to the footrest portion, the footrest portion can be heated relatively uniformly. In addition, since a part of the heat of the heater is reflected by the lower surface of the baffle plate and irradiated to the heat receiving board, the heat storage body can also be effectively heated via the heat receiving board.

  In the foot warmer of the present invention, it is preferable that a temperature sensor and a temperature fuse are attached to the baffle plate, and a control device for adjusting the output of the heater by a signal from the temperature sensor is provided.

  According to this, it is possible to measure the heat of the heater more directly by attaching the temperature sensor and the temperature fuse to the baffle plate that covers the upper part of the heater, and the temperature response in the stop or over temperature adjustment. Property can be improved.

  In the foot warmer of the present invention, the control device is switched between a control for cold time in which the upper limit of the set temperature is relatively high and a control for warm time in which the upper limit of the set temperature is relatively low. It is preferable that it is comprised.

  According to this, for example, during cold weather such as winter, select the control for the cold when the upper limit of the set temperature is high, and switch to the control for the warm when the upper limit of the set temperature is low during the warm season such as spring, summer, and autumn. By doing so, an energy saving effect can be brought about.

  In the foot warmer of the present invention, it is preferable that the foot rest portion of the housing is inclined obliquely at a predetermined angle with respect to the mounting surface of the foot warmer. According to this, when used in an office chair such as a study desk, office desk, etc., the knee is almost at right angles, but by placing the foot heater with the lower height toward the foot, Since the toes can be made lower than the heel, it is possible to place the foot on a natural body rather than the horizontal plane. Also, for example, when used on a sofa or the like, the knee is 90 degrees or more, but by placing the higher one of the foot warmers toward the toes, the toes can be made higher than the heels. So you can put your feet on the natural surface from the horizontal. Therefore, it is possible to put the foot on the foot warmer with a natural body, and to reduce fatigue.

  In the foot warmer of the present invention, the heat storage body is filled with a heat storage material configured to encapsulate a phase change material and to maintain a predetermined temperature range for a long time by using latent heat of the phase change material. It is preferable that According to this, by setting the temperature region that changes from the liquid phase of the phase change material constituting the heat storage material to the solid phase at an optimum temperature for heat retention as an anchor or a warmer, without risk of burns, A heat storage body that can be maintained at a temperature suitable for heat retention for a long time can be provided.

  In the foot warmer of the present invention, it is preferable that the heat receiving board has a box shape and is configured such that the heat storage body is accommodated in the box so that the heat storage body can be taken in and out. According to this, by making the heat receiving board into a box shape and housing the heat storage body inside the box, the heat accumulated in the heat storage body can be held by surrounding the outer periphery of the heat storage body with the box.

  According to the foot warmer of the present invention, the feet can be warmed by the heat of the heater, and during use, the heat of the heater is transferred to the heat storage body via the heat receiving board, so that the heat storage body is warmed. This heat storage body can be used as an anchor or a warmer. At this time, since the heat of the heater is made uniform by the heat receiving board and transferred to the heat storage body, the heat storage body can be heated evenly.

  In addition, dust and debris that have entered through the through holes in the footrest drop and accumulate on the heat receiving board, but by removing the heat receiving board, dust and debris are placed on the heat receiving board and removed, so Intruding dust and debris can be easily cleaned.

  Hereinafter, an embodiment of a foot warmer of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the foot warmer 1 has a housing 10. Referring to FIGS. 2 and 3 together, the casing 10 in this embodiment has a horizontally long box shape as a whole, and is disposed in parallel with the horizontally long front wall 11 extending in a predetermined length. The horizontally long rear wall 12, the front wall 11 and the footrest 13 connected to the upper ends of the rear wall 12, and the longitudinal ends of the front wall 11, the rear wall 12 and the footrest 13 are connected to each other. And a long plate-like bottom plate 15 connected to the lower ends of the front wall 11 and the rear wall 12. In the case of this embodiment, each member constituting the housing 10 is made of wood.

  A control device storage port 11a is formed at a corner portion where the front wall 11 and the footrest portion 13 are connected (see FIG. 1), and a control device 40 (to be described later) is stored, and its operation buttons are arranged. It is exposed to the outside. Further, in the middle of the rear wall 12 in the height direction, a vent 12a is formed along the length direction. Further, below the rear wall 12, a drawer port 12b that slidably receives a heat receiving board 30 described later is formed with a predetermined length. The upper side of each side wall 14 has a shape that is inclined such that the front wall 11 side is low and gradually increases toward the rear wall 12.

  In addition, the footrest 13 has a structure in which a plurality of elongated pillars 13a extending in a bar shape are arranged in parallel with a predetermined gap, and on the back side thereof, a metal made with a flocked surface is used. The protection plate 13b is integrally attached via a bolt or the like (not shown). A plurality of round holes 13c are formed in a portion of the protective plate 13b that is not hidden by the column member 13a in order to pass heat from the heater 20 described later. The through-hole 13c may be a long hole or a square hole, and may be a large-diameter hole that is opened larger, and is not particularly limited.

  And the footrest part 13 of the said structure is arrange | positioned along the upper side of the side wall 14, and each pillar material 13a is arrange | positioned so that the front wall 11 side may become low and it may become high gradually toward the rear wall 12 side. As a result, the footrest 13 has a structure that is inclined obliquely at a predetermined angle with respect to the placement surface of the foot warmer 1.

  In addition, guide ribs 15a and 15a are erected in parallel on the upper surface of the bottom plate 15 with a width adapted to the length direction of the heat receiving board 30 to prevent the heat receiving board 30 from rattling during the sliding operation. It has become so. In addition, when the screw to which the support plate 22 is fixed is slipped off and slips off, it is designed to stop at the guide rib 15a so that safety can be ensured. A gripping groove 15 b is formed in the center of the side plate of the bottom plate 15 on the rear wall 12 side so as to facilitate gripping a handle 34 (described later) of the heat receiving board 30.

  A heater 20 for heating the footrest 13 is disposed inside the housing 10 having the above structure. The heater 20 includes an infrared bulb including a halogen heater using a tungsten wire as a heating element, a carbon heater using a carbon fiber as a heating element, a quartz tube heater using nickel chrome as a heating element, and a metal pipe with a heater wire built-in. In this embodiment, a halogen heater that has good responsiveness when a voltage is applied is used. In addition, the heater 20 of this embodiment has a rod shape extending at a predetermined length, and is supported along the length direction of the horizontally long box-shaped casing 10 by a support plate 22 disposed below the heater 20.

  Specifically, a long plate-like support plate 22 made of a metal perforated plate is disposed between the heater 20 and the heat receiving board 30. A pair of brackets 24, 24 are fixed in the center of the width direction (direction perpendicular to the length direction) of the support plate 22 and in the vicinity of both side portions in the length direction. Both ends are supported. As a result, the heater 20 is supported substantially at the center in the width direction of the support plate 22 and along the length direction thereof.

  Further, both side portions 22a and 22a in the length direction of the support plate 22 are bent downward, and these are fixed to the inner surfaces of the pair of side walls 14 and 14 by screws or the like, and are supported in the housing 10. The plate 22 is fixed. As shown in FIG. 3, the support plate 22 of this embodiment is fixed at a position shifted to the rear wall 12 side.

  Further, the support plate 22 is formed with a plurality of long holes 22b. In the support plate 22 of this embodiment, a plurality of holes 22b are formed in a range slightly wider than the length of the heater 20, and a portion located below the heater 20 and both sides in the length direction of the support plate 22 are The hole 22b is not formed. The through-hole 13c is not particularly limited, and may be a round hole, a square hole, or the like, or a large-diameter hole having a larger opening.

  Further, in the description with respect to the hole 22b, the length in the width direction of the support plate 22 is formed so as to be substantially matched with the length in the width direction of the protection plate 13b. Dust and dust that have entered the interior 10 fall onto the heat receiving board 30 through the holes 22b of the support plate 22.

  Furthermore, a metal baffle plate 27 is disposed above the heater 20 so as to cover the heater 20 with a width slightly wider than that of the heater 20. That is, as shown in FIG. 1, a pair of support columns 25, 25 are erected on the front wall 11 side from the center in the width direction of the support plate 22 and in the vicinity of both side portions in the length direction. Both ends of the baffle plate 27 are fastened and fixed to the columns 25, 25 via bolts 27a, 27a. As a result, the baffle plate 27 covers the heater 20 and is supported so as to protrude toward the front wall 11 so as to cover a wide range of the support plate 22 on the front wall 11 side (see FIG. 3). .

  On the upper surface side of the baffle plate 27 and on both sides in the width direction, a temperature sensor 28 and a temperature fuse 29 are attached via screws, adhesives, or the like. The temperature sensor 28 measures the surface temperature of the baffle plate 27 heated by the heater 20 and sends a signal to a control device 40 which will be described later. The temperature fuse 29 has a surface temperature of the baffle plate 27 exceeding a predetermined value. When the temperature rises, the fusible material in the fuse melts and the voltage supply to the heater 20 is cut off.

  In connection with the temperature sensor 28 and the thermal fuse 29, the control apparatus 40 is demonstrated with reference to FIG. As shown in the figure, a temperature sensor 28 and a temperature fuse 29 are connected to the heater 20 via lead wires, and the temperature sensor 28 is further connected to a control device 40 via lead wires. . Further, the control device 40 and the thermal fuse 29 are connected to a power source V.

  A control signal is sent from the temperature sensor 28 that measures the surface temperature of the baffle plate 27 to the control device 40, and the maximum output of the heater 20 is controlled by the control device 40. Further, when the surface temperature of the baffle plate 27 becomes equal to or higher than a predetermined value, the voltage supply from the power source V is cut off by the thermal fuse 29 and the heating operation of the heater 20 is stopped.

  Further, in the control device 40, a cold circuit 41 in which the maximum output of the heater 20 is set high, a warm circuit 42 in which the maximum output of the heater 20 is set low, and both circuits 41, 42. And a change-over switch 43 capable of switching both circuits 41 and 42 is provided. Accordingly, by appropriately operating the changeover switch 43, the circuit is switched to either the cold circuit 41 or the warm circuit 42, and the maximum output of the heater 20 is controlled. In this embodiment, the output is controlled at 0 to 220 W, and in the cold circuit 41, the temperature of the through hole 13c is adjusted to 50 to 100 ° C., while in the warm circuit 42, the through hole is adjusted. The temperature of 13c is adjusted to 40 to 80 ° C.

  A heat receiving board 30 is detachably disposed inside the housing 10 having the above structure and below the heater 20. The heat receiving board 30 includes a long plate-like bottom plate 31, a peripheral wall 32 erected from both sides in the length direction and one side in the width direction, and a long plate-like shape connected to the upper end of the peripheral wall 32. It consists of a ceiling plate 33 and has a box shape with one side open. Therefore, a heat storage body 50 described later can be taken in and out of the heat receiving board 30 from the opening. Further, below the one side in the length direction of the bottom plate 31 (on the rear wall 12 side of the housing 10), when the heat receiving board 30 is housed in the back of the housing 10, it is disposed in the gripping groove 15 b of the bottom plate 15. A handle 34 is provided to facilitate the sliding operation of the heat receiving board 30.

  The heat receiving board 30 is formed of wood selected from fiber boards such as hard board, MDF (medium density fiber board), insulation board, plywood (laminated plywood), muku material and laminated material. Since the hard board, MDF, and the like have high heat resistance and are homogeneous, there is an advantage that heat from the heater 20 is not released and the heat can be made uniform.

  A heat storage body 50 is detachably attached to the lower surface of the heat receiving board 30. In this embodiment, the heat storage body 50 is accommodated in the box-shaped heat receiving board 30 described above, the periphery of the heat storage body 50 is covered, and the heater 50 is supplied to the heat storage body 50 from the ceiling plate 33 disposed mainly on the upper surface side. Twenty heats are transferred. The heat storage body 50 is formed from a heat storage fiber, a synthetic resin, or the like, which is a heat storage material configured to microencapsulate a phase change material and maintain a predetermined temperature range for a long time using latent heat of the phase change material. It is composed of a bag filled with a bag. As the heat storage material as described above, for example, “NOPOS” (trade name, manufactured by Yamaichi Co., Ltd.) can be used.

  Next, the usage method of the foot warmer 1 of the present invention having the above configuration will be described.

  FIG. 5 shows a usage method when the user sits on a chair such as a study desk or an office chair such as an office desk. In this case, a power switch (not shown) is turned on to supply voltage to the heater 20, and the front wall 11 side of the foot warmer 1 having a low height is arranged on the toe side, and the rear wall 12 side is arranged on the heel side. Then, place the foot on the footrest 13. Thus, in this embodiment, by adjusting the orientation of the foot warmer 1, the toe can be lowered from the heel even when sitting on a chair and the knee is almost perpendicular, so that it is lower than the horizontal plane. You can put your feet naturally and even if you put your feet on the foot warmer 1 for a long time, the fatigue can be reduced.

  Then, the heat of the heater 20 passes through the through-hole 13c of the protective plate 13b on the back surface of the footrest 13 and is directly irradiated to the sole, as shown by reference numeral H1 in FIG. However, as shown by reference numeral H2 in FIG. 3, the back surface of the protection plate 13b is irradiated, the entire footrest portion 13 is heated via the protection plate 13b, and the heat is transferred to the sole, Hot air rises and wraps around your feet, warming your feet.

  In addition, the heat of the heater 20 is mainly applied to the ceiling plate 33 of the heat receiving board 30 during use as the foot warmer 1 for warming the feet. As a result, the heat of the heater 20 is transferred to the heat storage body 50 via the heat receiving board 30, so that the heat storage body 50 can also be warmed. Therefore, after gripping the handle 34 and pulling out the heat receiving board 30 from the inside of the housing and taking out the heat storage body 50 from the heat receiving board 30, the heat storage body 50 can be placed inside the futon as an anchor, You can use it inside. As a result, the heat from the heater 20 can be used efficiently without waste. At this time, since the heat of the heater 20 is made uniform by the heat receiving board 30 and is transferred to the heat storage body 50, the heat storage body 50 can be heated evenly.

  The heat receiving board 30 has a box shape in this embodiment, and the heat storage body 50 is accommodated therein so as to be able to put in and out. As a result, the outer periphery of the heat storage body 50 is surrounded by each component of the box-shaped heat receiving board 30, that is, the bottom plate 31, the peripheral wall 32, and the ceiling plate 33. Therefore, it can be held efficiently by making it difficult to release to the outside, and the above-described anchor and warmer can be effectively heated.

  Furthermore, the heat storage body 50 in this embodiment is filled with a heat storage material configured to encapsulate a phase change material and to maintain a predetermined temperature range for a long time using the latent heat of the phase change material. Yes. As a result, by setting the temperature range that changes from the liquid phase to the solid phase of the phase change material that constitutes the heat storage material to the optimum temperature for the insulation as an anchor or warmer, it is possible to keep the heat without risk of burns etc. The heat storage body 50 that can be maintained at a suitable temperature for a long time can be provided.

  By the way, in the foot warmer 1 of this embodiment, the support plate 22 made of a metal perforated plate is disposed between the heater 20 and the heat receiving board 30. Therefore, the heat of the heater 20 is reflected by a portion where the hole 22b is not opened as shown by reference numeral H3 in FIG. 3, and the ceiling of the heat receiving board 30 is passed through the hole 22b as shown by reference numeral H4 in FIG. The plate 33 is irradiated. As a result, the heat of the heater 20 can be effectively distributed to both the footrest 13 and the heat receiving board 30.

  Furthermore, in this embodiment, a metal baffle plate 27 that covers the heater 20 is disposed above the heater 20 with a width that is slightly wider than the heater 20. As a result, as shown by reference numeral H5 in FIG. 3, the heat of the heater 20 is diffused by the baffle plate 27 and irradiated to the footrest portion 13, so that the footrest portion 13 can be heated relatively uniformly. . Thereby, the user's sole can be warmed evenly, and the comfort can be enhanced. 3, a part of the heat of the heater 20 is reflected by the lower surface of the baffle plate 27 and is irradiated on the ceiling plate 33 of the heat receiving board 30, so that heat is stored via the heat receiving board 30. The body 50 can be heated more effectively.

  In this embodiment, since the metal baffle plate 27 is disposed above the heater 20, the surface temperature of the baffle plate 27 also varies as the heater 20 fluctuates. A temperature sensor 28 and a thermal fuse 29 are attached to such a baffle plate 27, and a control device 40 for adjusting the output of the heater 20 by a signal from the temperature sensor 28 is provided (see FIG. 4). ). As a result, it becomes possible to measure the heat of the heater 20 more directly, and it is possible to improve the temperature responsiveness in stopping the overheating and adjusting the temperature.

  Furthermore, the control device 40 according to this embodiment includes a control for cold time in which the upper limit of the set temperature is relatively high (see FIG. 4: circuit for cold time 41) and a warm temperature in which the upper limit of the set temperature is relatively low. It is configured to be switched by a changeover switch 43 for time control (see FIG. 4: circuit for warming time 42). For this reason, for example, by selecting control for cold weather with high maximum output during cold weather such as winter, and switching to control for warm weather with low maximum power during warm weather such as spring, summer, and autumn, energy saving effects are achieved. Can bring.

  By the way, in this foot warmer 1, since the through hole 13c is provided in the footrest part 13, if it is used for a long period of time, dust and dust enter the housing 10 from the through hole 13c. It may end up. However, in this foot warmer 1, dust and dirt accumulate on the upper surface of the ceiling plate 33 of the heat receiving board 30. Therefore, by removing the heat receiving board 30 from the housing 10, dust and dirt are placed on the heat receiving board 30 and taken out. Therefore, it is possible to easily clean dust and dirt that have entered the housing 10.

  Moreover, in this embodiment, although the support plate 22 is arrange | positioned under the heater 20, it can suppress that dust and a dust accumulate on this. That is, in this embodiment, since the support plate 22 is provided with the hole 22b, dust and dirt that have entered through the through hole 13c of the footrest portion 13 pass through the hole 22b and onto the ceiling plate 33 of the heat receiving board 30. Since it falls (see arrow F in FIG. 4), dust and dirt can be deposited on the heat receiving board 30 and can be cleaned, and dust and dirt are prevented from accumulating on the support plate 22. be able to.

  FIG. 6 shows another example of use of the foot warmer 1. That is, the user sits on the sofa and relaxes by throwing his legs forward. At this time, the knee is 90 degrees or more. In this case, contrary to FIG. 5, the front wall 11 side of the foot warmer 1 having a low height is disposed on the heel side, the rear wall 12 side is disposed on the toe side, and the foot is placed on the footrest portion 13. . As a result, the toe can be lowered from the heel, so that it is possible to put the foot on the natural body rather than the horizontal surface, the foot can be placed on the foot warmer 1 with the natural body, and fatigue can be reduced.

It is a disassembled perspective view which shows one Embodiment of the foot warmer of this invention. It is a perspective view of the same leg warmer. It is sectional drawing in the AA arrow line of FIG. It is a block diagram of the control circuit centering on the control apparatus of the foot warmer of this invention. It is a perspective view which shows one example of use of the same leg warmer. It is a perspective view which shows the other usage example of the same leg warmer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Foot warmer 10 Housing | casing 11 Front wall 11a Control apparatus accommodation port 12 Rear wall 12a Vent 12b Drawer port 13 Foot mounting part 13a Pillar material 13b Protection plate 13c Through-hole 14 Side wall 15 Bottom plate 15a Guide rib 15b Holding groove 20 Heater 22 Support Plate 22a Both sides 22b Hole 24 Bracket 25 Post 27 Baffle plate 27a Bolt 28 Temperature sensor 29 Thermal fuse 30 Heat receiving board 31 Bottom plate 32 Peripheral wall 33 Ceiling plate 34 Handle 40 Controller 41 Cold circuit 42 Warming circuit 43 Changeover switch 50 Thermal storage

Claims (8)

A housing in which a footrest portion having a through hole is formed on the upper surface;
A heater disposed in the housing for heating the footrest;
A heat receiving board that is detachably disposed below the heater in the housing;
A heat storage body detachably attached to the lower surface of the heat receiving board,
The foot warmer is configured such that the heat storage body is heated by the heat of the heater through the heat receiving board.   A support plate made of a metal perforated plate that supports the heater is disposed between the heater and the heat receiving board, and heat of the heater is reflected at a portion of the support plate where the hole is not opened, so that the foot 2. The foot warmer according to claim 1, wherein the foot warmer is configured to irradiate the mounting portion and to irradiate the heat receiving board with heat of the heater through a hole of the support plate.   The foot warmer according to claim 1 or 2, wherein a metal baffle plate that covers the heater with a width slightly wider than the heater is disposed above the heater.   The foot warmer according to claim 3, wherein a temperature sensor and a temperature fuse are attached to the baffle plate, and a control device for adjusting the output of the heater according to a signal from the temperature sensor is provided.   5. The control device is configured to be switched between a control for cold time in which the upper limit of the set temperature is relatively high and a control for warm time in which the upper limit of the set temperature is relatively low. The listed foot warmer.   The foot warmer according to any one of claims 1 to 5, wherein the footrest portion of the housing is inclined obliquely at a predetermined angle with respect to a mounting surface of the foot warmer.   The heat storage body is one in which a phase change material is microencapsulated and filled with a heat storage material configured to maintain a predetermined temperature range for a long time by using latent heat of the phase change material. The foot warmer as described in one.   The foot heat heater according to any one of claims 1 to 7, wherein the heat receiving board has a box shape, and the heat storage body is housed in the box so that the heat storage body can be put in and out.