JP2012143406A - Heat insulation instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat insulation instrument which gives a good feeling of use and easily puts legs in and out.SOLUTION: The heat insulation instrument 10 includes a cylindrical storing part 12 provided with an upper opening part 22 capable of putting the legs in and out on an upper part, to heat the legs stored into the storing part 12 through the upper opening part 22. The storing part 12 is composed of a plate-like heat insulating material 14 prepared by joining a surface fabric 18 and a back surface fabric 20 on the surface and the back surface of a flexible urethane foam 16 with a flexibility by a flame lamination. In the heat insulating material 14 is set so that the tensile loadings in the surface fabric 18 and the back surface fabric 20 along the vertical direction of the storing part 12 are larger than the tensile loading in the flexible urethane foam 16 along the vertical direction of the storing part 12.

Description

  The present invention relates to a heat retaining device that accommodates and retains feet.

  There are socks such as high socks and shoes such as boots as a material for covering the feet with a heat-insulating fabric and keeping the feet warm. These are fabrics fitted to the feet to suppress heat dissipation from the body. However, since the foot and the dough come into contact with each other, hot air tends to be accumulated and easily steamed. In addition, the fabric may absorb sweat released from the body surface, and may be cooled by the heat of vaporization of the sweat.

  As a heat retaining device that provides a space between the foot and covers the foot to keep warm, there is a heat-insulating fabric formed in a bag shape. For example, in patent document 1, the opening part for foot insertion is provided in the upper part of the main body formed in the bag shape with the quilting fabric | filling with a batting, or raising fabric. The opening is narrowed with a rubber string so that both feet can be taken in and out. In addition, the heat insulating device of Patent Document 2 has an outer case in which a front material and a lining material are sewn into a substantially foot shape that opens upward, and a heating fabric woven with silver fibers provided inside the outer material. And the board | plate material is provided between the outline and the heat generating cloth, and the shape of the heat insulator is ensured.

Japanese Utility Model Publication No. 61-159917 JP 2008-237356 A

  However, since the warmer of Cited Document 1 does not have a configuration for retaining the shape of the warmer, the main body is deformed by its own weight, and the position and shape of the opening for foot placement are not determined. For this reason, it is difficult to insert and remove the foot smoothly from the opening. In the heat retaining device of the cited document 2, the shape is held by the plate material provided between the outer shell and the heat generating fabric, so that the opening for putting in and out the foot is maintained at a predetermined position and shape. However, since a hard and rigid plate material is used, there is a problem in that the freedom of movement of the foot is limited and the feeling of use is poor.

  That is, the present invention has been proposed in order to suitably solve these problems inherent in the prior art, and it is intended to provide a heat retaining device that has a good feeling of use and that can be easily inserted and removed. Objective.

In order to overcome the above-mentioned problems and achieve the intended purpose, a heat insulating device according to claim 1 of the present application is:
A heat retaining device that includes a cylindrical storage portion provided with an opening that allows a foot to be taken in and out, and that warms the foot stored in the storage portion through the opening,
The container is composed of a plate-shaped heat insulating material in which a fabric is joined to the front and back surfaces of a flexible flexible polyurethane foam.
The gist of the heat insulating material is that the tensile load along the vertical direction of the accommodating portion in the fabric is set larger than the tensile load along the vertical direction of the accommodating portion in the flexible urethane foam.
According to the first aspect of the present invention, since the housing portion is formed of the heat insulating material in which the fabric is bonded to the front and back surfaces of the heat-insulating flexible urethane foam, the heat retaining property of the heat retaining device can be ensured. In addition, since the tensile load along the vertical direction of the housing portion in the fabric is larger than the tensile load along the vertical direction of the housing portion in the flexible urethane foam, the flexible urethane foam is moved in the vertical direction by the fabric attached to the flexible urethane foam. Therefore, the accommodating portion can be made independent. Thereby, the position and shape of the opening part which takes in / out a leg | foot are easy to be maintained, and the insertion / extraction of a leg | foot becomes smooth. In addition, since the heat insulating material constituting the housing portion is composed of a fabric joined to both surfaces of the soft urethane foam, the housing portion has flexibility because the fabric is difficult to impair the flexibility of the soft urethane foam. ing. For this reason, since the freedom degree of the motion of the leg accommodated in an accommodating part increases, a usability can be improved. Furthermore, since it is not necessary to provide a hard member as the core material, it is possible to avoid the restriction of the foot movement due to the hard member.

The gist of the invention according to claim 2 is that the heat insulating material is set such that the tensile load along the circumferential direction of the accommodating portion in the fabric is smaller than the tensile load along the vertical direction of the accommodating portion in the fabric. To do.
According to the second aspect of the present invention, since the tensile load along the circumferential direction of the accommodating portion in the fabric is smaller than the tensile load along the vertical direction, the circumferential deformation in the accommodating portion is smaller than the vertical direction of the accommodating portion. Since it is permitted, the degree of freedom of movement of the foot placed in the accommodating portion is increased, and the usability can be further improved.

The gist of the invention according to claim 3 is that the accommodating portion is formed by forming the one heat insulating material into a cylindrical shape.
According to the invention which concerns on Claim 3, since a accommodating part is formed by shape | molding one continuous heat insulating material in the cylinder shape, it is easy to balance and the shape of an accommodating part is more easily hold | maintained.

The gist of the invention according to claim 4 is that the heat insulating material has a fabric laminated on the front side and the back side of the flexible urethane foam by frame lamination.
According to the invention which concerns on Claim 4, since a fabric is directly bonded on both surfaces of a flexible urethane foam by frame lamination, the feeling of use is not hindered by an adhesive layer such as an adhesive or a double-sided tape.

  According to the heat insulator according to the present invention, the feeling of use is good and the shape is easily maintained.

It is a perspective view which shows the heat insulating tool which concerns on an Example in the state fractured | ruptured partially. It is a side view which shows the use condition of the heat insulator which concerns on an Example. It is XX sectional drawing of the heat insulating tool of FIG. It is a rear view of the heat insulator which concerns on an Example, (a) shows the state which the opening-and-closing part closed, (b) shows the state which the opening-and-closing part opened. It is a perspective view which shows the heat retention tool of another Example. It is a side view which shows the heat insulator of another Example.

  The heat insulating device according to the present invention will be described below with reference to the accompanying drawings by giving a preferred embodiment. In the following description, “upper”, “lower”, “left”, “right”, “front”, and “rear” are designated based on the state in which the user holds his / her foot in the heat insulator. . That is, the side where the foot is put in and out is the upper side, and the side in contact with the back of the stored foot is the lower side. The side where the user's toes are accommodated is the front side, the side where the user's heel is accommodated is the rear side, the right foot side of the user is the right side, and the left foot side of the user is the left side.

(Example)
In the embodiment, as shown in FIG. 2, a description will be given by taking as an example a heat retaining device 10 that accommodates and warms both legs (under the knee) of a user M sitting on a chair or the like. As shown in FIG. 1, the heat retaining device 10 includes a hollow cylindrical housing portion 12 provided with an upper opening 22 (opening) in which a foot can be taken in and out. The interior of the accommodating portion 12 serves as an accommodating space 24 that encloses and accommodates the user's feet from front, rear, left and right. A flat bottom portion 26 is provided at the lower portion of the accommodating portion 12. That is, the heat retaining device 10 is formed in a bucket shape from the housing portion 12 and the bottom portion 26.

  The accommodating portion 12 has a substantially quadrangular cylindrical shape with a rounded cross section, and has a substantially quadrangular prism shape with open upper and lower surfaces. The accommodating part 12 is comprised with the plate-shaped heat insulating material 14 which joined the fabrics 18 and 20 to the surface and back surface of the plate-shaped soft urethane foam 16 which has flexibility. The accommodating portion 12 is formed by bending one heat insulating material 14 into a cylindrical shape and joining a seam 28. That is, the front surface, the right surface, the rear surface, and the left surface of the housing portion 12 are configured by a single heat insulating material 14.

  As shown in FIG. 1, the heat insulating material 14 includes a flexible urethane foam 16 composed of a lining fabric 20 that constitutes the inside (accommodating space 24 side) of the accommodating portion 12 and a surface fabric 18 that constitutes the outside of the accommodating portion 12. It has a sandwich structure. The heat insulating material 14 is laminated by a so-called frame laminate in which the surface of the thermoplastic flexible urethane foam 16 is heat-melted and the outer fabric 18 and the lining fabric 20 made of woven fabric or knitted fabric are bonded. And the tensile load along the up-down direction (longitudinal direction) of the accommodating part 12 in the fabrics 18 and 20 is set larger than the tensile load along the up-and-down direction of the accommodating part 12 in the flexible urethane foam 16, and the fabrics 18 and 20 Compared to the flexible urethane foam 16, it is difficult to expand and contract in the vertical direction. In addition, the tensile load along the circumferential direction (lateral direction) of the accommodating portion 12 in the fabrics 18 and 20 is set to be smaller than the tensile load along the vertical direction in the fabrics 18 and 20, and the fabrics 18 and 20 are circumferential in the vertical direction. It is easy to expand and contract. In accordance with the tensile load (JIS L1096: 2010 A method (strip method)) of the heat insulator 10 of the example, the test piece is 30% wide at 30 mm, the distance between the grippers is 100 mm, and the test speed is 150 mm / min. Measuring time load) is 8.4 N for the flexible urethane foam 16, 35.8 N along the vertical direction of the accommodating portion 12 in the outer fabric 18, and the direction along the circumferential direction of the accommodating portion 12 in the outer fabric 18. 3.0N, the direction along the up-and-down direction of the accommodating part 12 in the lining fabric 20 is 17.8N, and the direction along the circumferential direction of the accommodating part 12 in the lining fabric 20 is 1.2N.

  As shown in FIG. 1 and FIG. 4, the joint 28 of the heat insulating material 14 in the housing portion 12 is provided vertically at a substantially central position in the left-right direction of the rear surface of the housing portion 12. In the joint 28 of the heat insulating material 14, an inner end 30 that is an inner circumferential end and an outer end 32 that is an outer circumferential end are joined in a state of overlapping in the front-rear direction. That is, the inner end portion 30 extending from the right side and the outer end portion 32 extending from the left side are joined in a state where the rear surface of the inner end portion 30 and the front surface of the outer end portion 32 are in contact with each other. In the warmer 10, about one third of the vertical direction is sewn from the lower end of the joint 28 in the housing 12 (the broken line in FIGS. 1 and 4 indicates the seam), and the inner end 30 and the outer end 32 is joined. In addition, approximately two-thirds of the upper and lower directions from the upper end of the joint 28 in the accommodating portion 12 are not stitched, and an opening / closing portion 34 that can be opened and closed by the inner end portion 30 and the outer end portion 32 is formed. That is, a cut is formed in the upper part of the rear surface of the housing part 12 in the vertical direction. In the opening / closing portion 34, the rear surface of the inner end portion 30 and the front surface of the outer end portion 32 overlap each other with a width of about 40 mm. Since the opening / closing portion 34 is not joined, the opening / closing portion 34 is opened so as to be separated from each other in the left-right direction with the lower joining portion as a fulcrum, or is overlapped with each other to close the cut.

  A constricted portion 36 that is constricted inside is provided at the height of the housing portion 12 near the ankle of the user M (see FIG. 2). In the warmer 10, a portion about 100 mm above the lower end of the front surface of the housing portion 12 is narrowed from the front to the rear by picking and sewing the heat retaining material 14. For this reason, a projecting portion 38 projecting forward is provided below the constricted portion 36 in the housing portion 12, and a projecting space 40 projecting forward is provided below the housing space 24. The overhanging space 40 corresponds to the toe of the user M.

  The bottom portion 26 is formed so as to cover the lower opening of the housing portion 12 from below (see FIG. 3). The bottom portion 26 is sewn to the lower edge of the housing portion 12, and is formed in accordance with the bottom fabric 25 that seals the lower opening of the housing portion 12 and the lower opening of the housing portion 12, and is placed on the bottom fabric 25. And a bottom plate 27 fitted to the lower portion of the accommodating portion 12. The bottom fabric 25 is not particularly limited as long as it is a woven fabric or a knitted fabric. However, it is preferable that the bottom fabric 25 is more flexible and breathable than the heat insulating material 14 forming the housing portion 12. The bottom plate 27 is formed of a waterproof synthetic resin, and is provided so as to be detachable from the housing portion 12 and the bottom fabric 25. As the waterproof synthetic resin, a closed cell resin foam having high heat insulation is preferable, and a polyolefin-based foam can be adopted. For example, a polyethylene foam having a thickness of about 10 mm, an ethylene-vinyl acetate copolymer resin ( EVA) foam or the like may be employed.

The flexible urethane foam 16 of the heat insulating material 14 has a foaming ratio of about 10 to 60 times and an apparent density of about 16 to 100 kg / m ^3, and is soft and has restorability (no plastic deformation). The flexible urethane foam 16 has an open-cell structure in which bubbles are continuous, but preferably has low air permeability from the viewpoint of heat insulation. The flexible urethane foam 16 preferably has a thickness of 3 to 30 mm, and more preferably 6 to 20 mm. The thickness ratio of the flexible urethane foam 16 to the height (vertical dimension) of the accommodating portion 12 is preferably 1/100 to 1/20. 40-200N are preferable and, as for the hardness (JIS K6400-2 D method) of the flexible urethane foam 16, 70-150N are more preferable. The elongation percentage (JIS K6400-53) of the flexible urethane foam 16 is preferably 30 to 350%, more preferably 50 to 200%. In accordance with the tensile load of flexible urethane foam 16 (JIS L1096: 2010 A method (strip method)), the load at 30% elongation was obtained under the conditions of a test piece width of 30 mm, a distance between grips of 100 mm, and a test speed of 150 mm / min. Measurement) is preferably 4 to 40N, and more preferably 8 to 30N. The heat retaining device 10 is configured such that the flexible urethane foam 16 has a hardness (JIS K6400-2 D method) of 70 N or more, a thickness of 3 mm or more, and 1/100 or more with respect to the height of the housing portion 12. Therefore, it is possible to easily hold the shape by suppressing bending by its own weight. In addition, the heat insulation device 10 is configured so that the flexible urethane foam 16 has a hardness (JIS K6400-2 D method) of 200 N or less and a thickness of 30 mm or less, so that it can be easily folded and handled when transported or unused. Can be.

  As the outer fabric 18 and the lining fabric 20, a knitted fabric or a woven fabric having the following characteristics can be adopted. For example, the heat retaining device 10 employs a suede-like polyester brushed product as the outer fabric 18 and employs a short-bore bore fabric as the lining fabric 20. Further, the outer fabric 18 and the lining fabric 20 can be adopted regardless of the air permeability. However, by using the fabrics 18 and 20 having a lower air permeability than the soft urethane foam 16, the soft urethane foam 16 has a lower air permeability. , 20, the gas is easily held in the flexible urethane foam 16 and the heat retaining action of the heat retaining device 10 can be improved. By adopting the lining fabric 20 having a lower air permeability than the flexible urethane foam 16, it is possible to suppress the release of heat of the gas in the accommodation space 24 to the outside. 50-130% is preferable and the elongation rate along the up-down direction in the accommodating part 12 of the surface fabric 18 is more preferable 70-110%. 140-230% is preferable and the elongation rate along the circumferential direction in the accommodating part 12 of the surface fabric 18 is more preferable 160-210%. The stretch rate along the circumferential direction of the housing portion 12 of the outer fabric 18 is preferably larger than the stretch rate along the vertical direction of the housing portion 12. Moreover, 20-60N are preferable and the tensile load along the up-down direction in the accommodating part 12 of the surface fabric 18 is more preferable, and 25-45N. 0.5N-40N are preferable and, as for the tensile load along the circumferential direction in the accommodating part 12 of the outer fabric 18, 18-30N are more preferable. 10-100% is preferable and, as for the elongation rate which follows the up-down direction in the accommodating part 12 of the lining fabric 20, 30-70% is more preferable. 50-150% is preferable and the elongation rate along the circumferential direction in the accommodating part 12 of the lining fabric 20 has more preferable 80-120%. It is preferable that the elongation rate along the circumferential direction in the accommodating portion 12 of the lining fabric 20 is larger than the elongation rate along the vertical direction in the accommodating portion 12. Moreover, 10-50N are preferable and, as for the tensile load along the up-down direction in the accommodating part 12 of the lining fabric 20, 15-45N are more preferable. 0.5N-40N are preferable and, as for the tensile load along the circumferential direction in the accommodating part 12 of the lining fabric 20, 1-30N are more preferable. The tensile load of the outer fabric 18 and the backing fabric 20 is 30 in accordance with JIS L1096: 2010 A method (strip method) under the conditions of a test piece width of 30 mm, a distance between grippers of 100 mm, and a test speed of 150 mm / min. The load at% elongation is measured. The elongation is measured under the same conditions as the tensile load at the maximum load.

(Operation of Example)
Since the heat insulating material 14 forming the accommodating portion 12 of the heat insulating material 14 is configured by joining the outer fabric 18 and the lining fabric 20 to both surfaces of the flexible urethane foam 16 having open cells, the heat retaining property of the heat insulating device 10 is ensured. can do. Moreover, since the tensile load along the up-down direction of the accommodating part 12 in the outer fabric 18 and the lining fabric 20 is larger than the tensile load of the flexible urethane foam 16, the outer fabric 18 and the lining fabric affixed to the flexible urethane foam 16. 20 will reinforce the flexible urethane foam 16 in the vertical direction. That is, the accommodating portion 12 can be made independent by the elasticity of the outer fabric 18 and the lining fabric 20. Thereby, the deformation | transformation of the accommodating part 12 by dead weight can be suppressed, the position and shape of the upper opening part 22 which puts in / out a leg | foot are easy to be hold | maintained, and the taking in / out of a leg | foot becomes smooth. Further, since the outer fabric 18 and the backing fabric 20 bonded to the flexible urethane foam 16 have a certain degree of elasticity and flexibility, it is difficult to impair the flexibility of the flexible urethane foam 16. Part 12) remains flexible as a whole. For this reason, since the accommodating part 12 can be deformed with flexibility when the accommodated foot abuts against the accommodating part 12, the touch feeling of the foot is soft and the freedom of movement of the foot is increased. To improve the feeling of use. Furthermore, it is not necessary to provide a hard plate material or the like in order to maintain the shape of the heat retaining device 10, and the movable range of the foot is not limited by using the plate material.

  Since the tensile load along the circumferential direction of the accommodating portion 12 in the outer fabric 18 and the lining fabric 20 is smaller than the tensile load along the vertical direction, the heat retaining device 10 is in the accommodating portion 12 while ensuring the shape retaining property of the accommodating portion 12. Since deformation in the circumferential direction is allowed, the degree of freedom of the foot accommodated in the accommodating portion 12 can be increased and the feeling of use can be further improved. Moreover, since the accommodating part 12 is formed by bending one sheet of the heat insulating material 14 into a cylindrical shape, it is easy to balance the accommodating part 12 and to make the heat insulating device 10 more self-supporting. Furthermore, since the outer fabric 18 and the backing fabric 20 are bonded to the flexible urethane foam 16 by frame lamination, the feeling of use is not hindered by an adhesive layer such as an adhesive or a double-sided tape.

  The heat retaining device 10 accommodates both feet in the accommodating space 24 and the feet and the accommodating portion 12 are not in close contact with each other. Further, since the released sweat is difficult to be absorbed by the storage portion 12, it is possible to suppress the cooling due to the heat of vaporization of the sweat absorbed by the storage portion 12. Further, since the opening / closing part 34 is provided on the rear surface of the accommodating part 12, the opening / closing part 34 is opened when the foot is taken in and out, so that the upper opening 22 is widened and the foot can be easily taken in and out (FIG. 4B). )reference). Since the accommodating portion 12 has shape retention, even if the inner end portion 30 and the outer end portion 32 are not sewn together as the opening / closing portion 34, the opening / closing portion is opened and closed because it is difficult to bend due to its own weight. It is easy to hold the closed shape of the portion 34. Since the inner end 30 and the outer end 32 of the opening / closing part 34 overlap each other, when the upper opening 22 spreads and the opening / closing part 34 opens to the left and right, the housing space 24 in the opening / closing part 34 and the outside Communication can be suppressed (see FIG. 4B). For this reason, the heat retaining property of the heat retaining device 10 can be secured while facilitating taking in and out of the foot.

  The warming device 10 is configured such that the air in the overhanging space 40 corresponding to the toe of the user M formed below the constricted portion 36 is exposed to the outside by the constricted portion 36 provided near the ankle of the user M in the accommodating portion 12. Since it can suppress flowing out, heat retention can be improved. Further, since the bottom plate 27 is provided so as to be detachable with respect to the accommodating portion 12, it can be removed and replaced or washed when it becomes dirty. Further, since the bottom plate 27 is detachably formed of a waterproof synthetic resin, the bottom plate 27 can be removed and easily washed even when used while wearing mud-attached or wet shoes. be able to. If the bottom fabric 25 is more flexible and breathable than the heat insulating material 14 forming the housing portion 12, the heat retaining device 10 with the bottom plate 27 removed can be easily washed. Furthermore, if the mesh-shaped bottom fabric 25 is employed, drying after washing becomes easier.

(Another embodiment)
Next, the heat insulator 50 according to another embodiment will be described. In the description of another embodiment, only portions different from the embodiment will be described, and the same portions as those of the embodiment will be denoted by the same reference numerals and detailed description thereof will be omitted.

  As shown in FIG. 5, the housing portion 12 of the heat retaining device 50 according to another embodiment has a substantially circular cylindrical shape in cross section, and has a substantially cylindrical shape with an open upper surface and a lower surface. A protruding portion 38 that protrudes forward by sewing is formed at the lower portion of the accommodating portion 12. As shown in FIG. 6, the housing 12 of the heat retaining device 50 is set such that the upper end of the rear surface is lower than the upper end of the front surface.

  A fixing portion 52 that fixes the opening / closing portion 34 is provided on the rear surface of the accommodating portion 12. The fixing portion 52 is a tongue-shaped belt 54 extending in the circumferential direction from the edge of the outer end portion 32 (in the heat retaining device 50, the outer end portion 32 extends from the right side and the inner end portion 30 extends from the left side). And a belt passage 56 provided at a position corresponding to the tongue-shaped belt 54 in the housing portion 12. The tongue belt 54 is integrated with the housing portion 12 by extending the heat insulating material 14 of the housing portion 12, and the edge portion is reinforced by piping. The belt passage 56 is formed in an arch shape joined to the accommodating portion 12 at the top and bottom of the tongue belt 54. The opening / closing part 34 is fixed by inserting the tongue belt 54 into the belt passage 56.

(Operation of another embodiment)
Since the rear surface upper end of the accommodating portion 12 in the heat retaining device 50 is set lower than the upper end of the front surface, it is easy to put in and out the foot from the rear. Thereby, the height of the accommodating part 12 can be made high and it can be set as the heat retention tool 50 with higher heat retention property. In addition, since the fixing portion 52 that fixes the opening / closing portion 34 is provided, the inner end portion 30 and the outer end portion 32 of the opening / closing portion 34 can be fixed in a desired positional relationship. The heat retaining property of the heat retaining device 50 can be improved by suppressing the inflow. Further, since the fixing portion 52 is configured by the tongue belt 54 and the belt passage 56, the fixing portion 52 can be configured simply. Further, since the tongue belt 54 is formed of the heat insulating material 14 extending from the accommodating portion 12, the tongue belt 54 can be easily inserted into the belt passage 56 by the elasticity of the heat insulating material 14. Since the edge of the tongue belt 54 is reinforced by piping, the tongue belt 54 can be more easily inserted into the belt loop 56.

(Example of change)
The present invention is not limited to the above-described embodiment, and can be modified as follows.
(1) In the embodiment, the warmer that accommodates both feet is taken as an example, but the warmer that accommodates and warms one foot may be used.
(2) In the embodiment, a cylindrical accommodating portion having a substantially square shape and a substantially circular cross section is adopted, but the accommodating portion may be a cylindrical shape capable of accommodating a foot.
(3) In the embodiment, an accommodating portion configured by bending a single heat insulating device into a cylindrical shape is adopted, but it is sufficient if it is formed into a cylindrical shape with a heat insulating material, and a plurality of parts formed with a heat insulating material. May be joined to form a cylinder.
(4) In the embodiment, a heat insulating material is used in which the tensile load of the outer fabric is larger than the tensile load of the lining fabric, but a thermal insulating material in which the tensile load of the outer fabric is smaller than the tensile load of the lining fabric may be used. Although the tensile load along the circumferential direction of the accommodating part in the fabric is set larger than the tensile load along the vertical direction of the fabric, the tensile load in the circumferential direction may be smaller than the tensile load in the vertical direction. In the embodiment, the outer fabric and the lining fabric are made of different fabrics, but the same fabric may be used.
(5) In the embodiment, the seam of the heat insulating material in the housing portion is stitched with the front end and the rear end overlapped in the front-rear direction, but the front end and the rear end are applied to the left and right. You may make it contact and join with an adhesive agent etc.
(6) In the embodiment, the opening / closing part is provided at the joint of the heat insulating material in the housing part, but the opening / closing part may be provided at a position different from the joint, or a plurality of opening / closing parts may be provided. The size of the opening / closing portion is not limited to one-third in the up-down direction, as long as the shape of the housing portion is maintained, and may be, for example, approximately one-half in the up-down direction. Moreover, the structure which does not provide an opening / closing part may be sufficient.
(7) In the embodiment, the entire accommodating portion is made of a heat insulating material having a soft urethane foam having the same degree of hardness, but the entire rear surface or the upper portion of the accommodating portion is softer than other portions. You may form with the heat insulating material which has. Since the rear surface of the housing part is more easily deformed, the legs can be easily put in and out. In this case, the hardness (JIS K6400-2 D method) of a soft urethane foam that is softer than other parts is preferably 15 to 40N. Such a soft flexible urethane foam may be attached along the inner edge of the upper end of the rear surface of the housing portion, and the inflow of outside air into the housing space can be suppressed.
(8) In the embodiment, a configuration in which the inner end and the outer end of the opening / closing portion overlap with each other with a width of 40 mm is adopted, but it is only necessary to suppress communication between the accommodation space with the opening / closing portion and the outside, and overlap with a width of 30 to 100 mm. A configuration is preferable.
(9) In the embodiment, the accommodating portion provided with the constricted portion is adopted, but the accommodating portion not provided with the constricted portion may be used. Further, in the embodiment, the constricted portion is formed by stitching, but it is sufficient that the vicinity of the ankle is constricted inward, and for example, it may be tied with a string.
(10) In the embodiment, a fabric that is more flexible and breathable than the heat insulating material is used as the bottom fabric, but the same fabric as the heat insulating material may be used. In the embodiment, a bottom plate provided detachably with respect to the housing portion is employed, but the bottom plate may be configured such that it cannot be removed, or may be configured so that there is no bottom plate. The bottom part may be formed of a heat insulating material, and the bottom part may be formed integrally with the housing part. Moreover, the structure which does not have the bottom part of a heat insulator may be sufficient.
(11) In the embodiment, the tongue belt is formed of a heat insulating material extending from the housing portion, but the tongue belt may be formed of a separate member. In the embodiment, a tongue belt and a belt loop are adopted as the fixing portion. However, the fixing portion may be fixed by a hook-and-loop fastener or a magnet as long as the opening / closing portion can be fixed.
(12) In the embodiment, the opening / closing part is provided on the rear surface of the housing part, but it may be provided on the left surface or the right surface of the housing part. In particular, when the opening / closing portion is provided with a tongue-shaped belt and a fixing portion including a belt loop as in another embodiment, the tongue-shaped belt can be easily inserted into the belt loop by providing the opening / closing portion on the left surface or the right surface.
(13) The upper opening can be made difficult to bend by being configured to be inclined inward (accommodating space side) as the accommodating portion is directed upward.

DESCRIPTION OF SYMBOLS 10 Heat insulating tool, 12 accommodating part, 14 heat insulating material, 16 flexible urethane foam 18 surface fabric (fabric), 20 lining fabric (fabric), 22 upper opening (opening)

Claims (4)

A heat retaining device that includes a cylindrical storage portion provided with an opening that allows a foot to be taken in and out, and that warms the foot stored in the storage portion through the opening,
The container is composed of a plate-shaped heat insulating material in which a fabric is joined to the front and back surfaces of a flexible flexible polyurethane foam.
In the heat insulating material, the tensile load along the vertical direction of the accommodating portion in the fabric is set to be larger than the tensile load along the vertical direction of the accommodating portion in the flexible urethane foam.   The warmer according to claim 1, wherein the heat retaining material has a tensile load along a circumferential direction of the housing portion in the fabric set smaller than a tensile load along the vertical direction of the housing portion in the fabric.   The heat retaining device according to claim 1 or 2, wherein the housing portion is formed by forming one sheet of the heat retaining material into a cylindrical shape.   The said heat insulating material is a heat insulating material as described in any one of Claims 1-3 which affixed the cloth on the front side and the back side of the said flexible urethane foam by frame lamination.

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