JP7794585B2 - hair iron - Google Patents

Description

The present invention relates to a hair iron.

Hair irons used for styling hairstyles are known. For example, the hair iron described in Patent Document 1 below has a pair of iron blades that are connected so that they can be opened and closed. The user holds their hair between the pair of iron blades, applies heat to the hair, and styles the hairstyle.

Japanese Patent Application Laid-Open No. 2020-150999

There is a demand for hair irons like the ones mentioned above that allow you to style your hair well without damaging it.

The present invention was developed based on the above circumstances, and aims to provide a hair iron that allows you to style your hair well without damaging it.

The hair iron of the present invention has an arm portion extending from a base end, the arm portion having a plate that is long in the direction of extension and an elastic member that supports the back side of the plate, and the elastic member has nonlinear elasticity that makes it more compressible when the load from the front side to the back side of the plate is small than when it is large.

According to the present invention, the plate is displaced with a small force, making it easier to bring the plate into uniform contact with the hair. This means that the plate does not need to be pressed strongly against the hair, allowing for good hairstyles without damaging the hair.

FIG. 1 is a perspective view showing a hair iron according to an embodiment of the present invention; A longitudinal cross-sectional view showing the hair iron in an open state Partially enlarged perspective view showing the vicinity of the switch An enlarged longitudinal cross-sectional view showing a part of the base end portion in a locked state. FIG. 10 is an enlarged cross-sectional plan view showing a portion of the base end portion when the locking member is placed in the lock position. FIG. 10 is an enlarged cross-sectional view showing a portion of the base end portion when the locking member is placed in the unlocked position. FIG. 10 is a partially cutaway perspective view showing the locking portion in a locked state. FIG. 10 is a partially cutaway perspective view showing the locking portion in an unlocked state. A longitudinal cross-sectional view showing the clamping portion of the upper arm portion. A plan view of the clamping portion of the upper arm as seen from below. FIG. 10 is an exploded perspective view showing the clamping portion of the upper arm portion. Flowchart showing the process when a power supply is connected to a hair iron Table showing the configuration of a conical coil spring of a comparative example FIG. 10 is a diagram showing the configuration of a conical coil spring of a comparative example. Table showing the calculation results of the load and deflection of the conical coil spring of the comparative example Graph showing the load-deflection curve of a conical coil spring of a comparative example

Preferred embodiments of the present invention are shown below.

In the hair iron of the present invention, the elastic member may support the plate at two or more points in the extension direction. With this configuration, the entire plate is supported in a balanced manner, making it easier for the entire plate to come into even contact with the hair.

Furthermore, in the hair iron of the present invention, the elastic member may be a conical coil spring.

<Example>
An embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 16. The hair iron 10 in this embodiment is used to arrange hairstyles. The hair iron 10 is a straightening iron, and as shown in FIG. 1, has a pair of arms 13A, 13B connected at a base end 12. The hair iron 10 arranges hairstyles by opening the pair of arms 13A, 13B, clamping hair therebetween, and applying heat to the hair. When the hair iron 10 is not in use, the pair of arms 13A, 13B are closed.

Hereinafter, the state in which the pair of arms 13A, 13B of the hair iron 10 are open will be referred to as the open state, and the state in which the pair of arms 13A, 13B are closed will be referred to as the closed state. In describing each component, the positive side of the Y axis in FIG. 1 (the side where the display unit 14 is provided) will be referred to as the upper side, the negative side of the Y axis in FIG. 1 will be referred to as the lower side, the positive side of the X axis (the tip side of the arms 13A, 13B) will be referred to as the front side, and the negative side of the X axis (the side where the base end 12 is provided) will be referred to as the rear side. The X axis indicates the front-to-rear direction or length direction, the Y axis indicates the up-down direction or thickness direction, and the Z axis indicates the left-to-right direction or width direction. In describing each arm 13A, 13B, the opposing sides of the pair of arms 13A, 13B will be referred to as the inner side or front side, and the sides opposite the opposing sides will be referred to as the outer side or back side.

The display unit 14 is provided on the outer surface of the upper arm portion 13A. The display unit 14 has, for example, an LED. The display unit 14 indicates whether the power is on or off, the set temperature, the charging status, etc.

The hair iron 10 has a clamping portion 15 that clamps the hair and a gripping portion 16 that the user holds. The clamping portion 15 is the front portion of the hair iron 10. The gripping portion 16 is the rear portion of the hair iron 10. In the closed state, the length, width, and thickness of the clamping portion 15 are smaller than the length, width, and thickness of the gripping portion 16.

The hair iron 10 is equipped with a cap case 17. The cap case 17 is placed over the clamping portion 15 from the front when it is closed.

The hair iron 10 is equipped with comb-shaped portions 18. The comb-shaped portions 18 are provided on both the left and right sides of the clamping portion 15. The comb-shaped portions 18 are formed along both the left and right edges of the housing 24 (described below) over roughly the entire length of the clamping portion 15 (see Figure 10). The comb-shaped portions 18 have multiple protrusions 19 arranged in the front-to-rear direction. Each protrusion 19 is triangular in shape with a pointed protruding end, and is arranged at equal intervals. By providing the comb-shaped portions 18, the surface area of the housing 24 can be increased, allowing for efficient heat dissipation and making it easier to reduce the temperature of the housing 24.

The hair iron 10 has a socket 22 for a USB cable 21. The socket 22 is compatible with USB Type-C. The socket 22 is located at the base end 12 of the upper arm portion 13A and opens to the rear. The hair iron 10 is connected to a power supply (not shown) via the USB cable 21. The power supply can be one that complies with the USB PD (Power Delivery) standard.

As shown in Figure 2, the pair of arms 13A, 13B can be freely moved between an open state and a closed state around a hinge 23 provided at the base end 12. Figure 2 shows the hair iron 10 in the open state. Each of the pair of arms 13A, 13B extends linearly forward from the base end 12.

Each arm portion 13A, 13B has a housing 24 that is long in the front-to-rear direction. The components that make up the hair iron 10 are housed inside the housing 24. The cross section of the housing 24 is curved in an arc, as shown in Figure 7. The left and right edges of the housing 24 are located closer to the front than the center of the housing 24 in the left-to-right direction.

As shown in FIG. 2, the housing 24 has a battery compartment 26 that houses a battery 25. The battery 25 is a rechargeable secondary battery such as a lithium-ion battery. The battery 25 is charged by connecting it to a power supply device via the USB cable 21. The hair iron 10 operates using power supplied from the battery 25.

The battery storage compartment 26 is provided in the grip portion 16 of the lower arm portion 13B. The front side of the battery storage compartment 26 is closed by a battery cover 27. The battery cover 27 is removable. By removing the battery cover 27, the battery 25 can be inserted or removed from the battery storage compartment 26.

As shown in Figure 3, the hair iron 10 is equipped with a switch 28 for turning the power on and off and for switching the set temperature of the heating element 44 (described below). The switch 28 is located on the inner surface of the upper arm portion 13A. By locating the switch 28 on the inner surface of the upper arm portion 13A, accidental operation is prevented more effectively than if the switch were located on the outer surface. The switch 28 is slidable in the front-to-rear direction. The power-off position of the switch 28 is located behind the power-on position. Figure 3 shows the switch 28 in the power-on position. When the cap case 17 is placed over the clamping portion 15, the switch 28 in the power-on position is pushed rearward by the pressing portion 17A located on the cap case 17, moving to the power-off position.

As shown in Figure 4, the base end 12 has a locking portion 30 that holds the pair of arms 13A, 13B in a closed state. The locking portion 30 has a first locking portion 31 provided on the upper side and a second locking portion 32 provided on the lower side. The first locking portion 31 and the second locking portion 32 come into contact when the pair of arms 13A, 13B attempt to move from the closed state to the open state, preventing further movement.

The first locking portion 31 protrudes downward from the housing 24 of the upper arm portion 13A.

The second locking portion 32 is provided on a locking member 33 held by the lower arm portion 13B. The locking member 33 swings left and right around the rotation shaft portion 33A between a locked position (see Figure 5) and an unlocked position (see Figure 6). In Figures 5 and 6, the line projected downward of the first locking portion 31 is shown by an imaginary line.

As shown in Figure 4, the locking member 33 comprises a main body 34 and an operating portion 35. The main body 34 is plate-shaped. The second locking portion 32 protrudes upward from the main body 34. The main body 34 has a lock retaining portion 36 that maintains the position of the locking member 33. The lock retaining portion 36 is a recess formed on the back surface of the main body 34. The lock retaining portion 36 fits into a protrusion 37 provided on the lower arm portion 13B. The protrusion 37 is elastically displaced in the vertical direction by a spring member 38. The elastic force of the spring member 38 acts in a direction that moves the protrusion 37 upward.

A pair of lock retaining portions 36 are provided, one on the left and one on the right. As shown in Figure 5, the left lock retaining portion 36 fits into the protrusion 37, thereby holding the locking member 33 in the locked position. As shown in Figure 6, the right lock retaining portion 36 fits into the protrusion 37, thereby holding the locking member 33 in the unlocked position.

The operating unit 35 protrudes from the rear surface of the main body 34. The operating unit 35 protrudes rearward from the housing 24. By moving the operating unit 35 left or right, the position of the second locking unit 32 can be changed between the locked position and the unlocked position. At this time, the protrusion 37 elastically deforms, providing the user with a clicking sensation.

As shown in Figure 7, the abutment surfaces 31A, 32A of the first locking portion 31 and the second locking portion 32 are inclined surfaces. When the abutment surfaces 31A, 32A abut against each other in the vertical direction, a force is generated at the abutment surfaces 31A, 32A that pushes the second locking portion 32 in the unlocking direction (to the left in Figure 7). When the force pushing the second locking portion 32 in the unlocking direction becomes greater than the force displacing the protrusion 37 downward, the lock retaining portion 36 disengages from the protrusion 37, and the locking member 33 moves to the unlocked position (see Figure 8).

The clamping portion 15 of the upper arm portion 13A and the clamping portion 15 of the lower arm portion 13B have roughly the same configuration. Here, we will explain the configuration of the clamping portion 15 of the upper arm portion 13A, and will not explain the configuration of the clamping portion 15 of the lower arm portion 13B.

As shown in Figure 9, each of the clamping portions 15 of the upper and lower arm portions 13A and 13B includes a plate 40 and an elastic member 41.

As shown in Figure 10, the plate 40 is a generally rectangular plate that is long in the front-to-rear direction. The length of the surface of the plate 40 is 60 mm, and the width is 12 mm. As shown in Figure 11, the plate 40 is equipped with, from the front side, a surface plate 42, a carbon-containing thermally conductive layer 43, a heating element 44, a thermally conductive layer 45, a temperature sensor 46, an elastic sheet 47, an insulating sheet 48, a pressing member 49, a thermal fuse 51, and a bracket 52.

The surface plate 42 is a roughly rectangular plate that is long in the front-to-rear direction. The surface plate 42 forms the contact surface that comes into contact with hair. The surface plate 42 has multiple holes 53 that penetrate from front to back. The holes 53 are arranged at equal intervals along the length of the surface plate 42. The front side of the surface plate 42 is covered with a low-friction sheet. The surface plate 42 has a peripheral wall 54 along its outer edge. The peripheral wall 54 surrounds the outer periphery of the carbon-containing thermally conductive layer 43, heating element 44, thermally conductive layer 45, elastic sheet 47, insulating sheet 48, and pressing member 49. The peripheral wall 54 has multiple protrusions 54A that protrude from the back side. The protrusions 54A guide the displacement of the plate 40 in the front-to-back direction relative to the housing 24.

The carbon-containing thermally conductive layer 43 is made of a graphite sheet. The carbon-containing thermally conductive layer 43 is rectangular and elongated in the front-to-rear direction, and is the same size as the back surface of the surface plate 42. The thickness of the carbon-containing thermally conductive layer 43 is uniform. The carbon-containing thermally conductive layer 43 is thin and flexible. Because the carbon-containing thermally conductive layer 43 is flexible, it is less likely to break even though it is thin. The thinness of the carbon-containing thermally conductive layer 43 allows for effective use of the space within the housing 24. Because the carbon-containing thermally conductive layer 43 is made of a graphite sheet, the surface temperature of the surface plate 42 can be made uniform. This makes it less likely that uneven hair protein denaturation will occur due to localized temperature increases.

The carbon-containing thermally conductive layer 43 contains a large amount of carbon and has a higher thermal conductivity than metal. The carbon-containing thermally conductive layer 43 is sandwiched between the surface plate 42 and the heating element 44. By providing the highly thermally conductive carbon-containing thermally conductive layer 43 between the surface plate 42 and the heating element 44, heat from the heating element 44 is quickly conducted to the surface plate 42. The heat from the heating element 44 is also quickly conducted in the planar direction of the carbon-containing thermally conductive layer 43, uniformly raising the temperature of the entire surface plate 42. The carbon-containing thermally conductive layer 43 emits far-infrared rays due to heat. The far-infrared rays are radiated to the hair through the holes 53 in the surface plate 42.

The heating element 44 is a flexible, planar heating element. It is composed of a film heater in which a heater wire (not shown) is disposed on an insulating film. The heater wire is disposed over the entire surface of the film. The heating element 44 is approximately rectangular and elongated in the front-to-rear direction. The heating element 44 is thin and lightweight. Electrodes are provided on both the front and rear ends of the heating element 44. The electrodes are fixed to the back surface of the pressing member 49 (see Figure 9).

The thermally conductive layer 45 is made of a metal foil (e.g., aluminum foil) with high thermal conductivity. The thermally conductive layer 45 is roughly rectangular, elongated in the front-to-rear direction, and spreads thinly over the entire back surface of the heating element 44. The thermally conductive layer 45 is attached to the back surface of the heating element 44. The thermally conductive layer 45 efficiently transfers the temperature of the heating element 44 to the temperature sensor 46. The thermally conductive layer 45 and the carbon-containing thermally conductive layer 43 are roughly the same size.

The temperature sensor 46 is an NTC thermistor or the like. The temperature sensor 46 detects the temperature of the heating element 44.

The elastic sheet 47 presses the temperature sensor 46 against the thermally conductive layer 45 (see Figure 9). The elastic sheet 47 is a silicone sheet. The elastic sheet 47 keeps the components that make up the plate 40 in close contact with each other. The elastic sheet 47 has protrusions 55 that secure the insulating sheet 48.

The insulating sheet 48 is a mica sheet. The insulating sheet 48 insulates the components that make up the plate 40.

The holding member 49 is a generally rectangular plate that is long in the front-to-rear direction. The holding member 49 is provided with a placement portion 56 for placing the thermal fuse 51.

The bracket 52 is a roughly rectangular plate that is long in the front-to-rear direction. The bracket 52 secures the thermal fuse 51 between itself and the retaining member 49. Both the front and rear ends of the bracket 52 have protruding pieces 52A that hook onto the housing 24. This prevents the plate 40 from coming off.

The bracket 52 has positioning portions 57 that position the elastic member 41. The positioning portions 57 protrude from the rear surface of the bracket 52. The positioning portions 57 are provided in two locations, one at the front and one at the back of the bracket 52. The positioning portions 57 are located on both the front and rear sides of the thermal fuse 51 (see Figure 9).

As shown in Figure 9, the elastic member 41 supports the back side of the plate 40. The plate 40 is held afloat above the housing 24 by the elastic member 41. The elastic member 41 is arranged in two locations, front and back. The elastic member 41 is tapered in side view. The elastic member 41 is circular in plan view (see Figure 10). The elastic member 41 has nonlinear spring characteristics that make it easier to compress when the load from the front side to the back side is small than when it is large. In other words, the resistance to deformation of the elastic member 41 is constant at the beginning of compression and increases as the amount of compression increases from the middle of compression onwards. The maximum axial compression amount of the elastic member 41 is, for example, 1.5 mm. The large maximum compression amount of the elastic member 41 allows the plate 40 to be displaced greatly in the front-to-back direction.

One axial end of the elastic member 41 is a small diameter portion 41A, and the other axial end is a large diameter portion 41B. The diameter of the small diameter portion 41A is smaller than the diameter of the large diameter portion 41B. The small diameter portion 41A is located on the plate 40 side, and the large diameter portion 41B is located on the housing 24 side. The small diameter portion 41A fits onto the outer periphery of a positioning portion 57 provided on the bracket 52.

The elastic member 41 is a conical coil spring. Conical coil springs have nonlinear elasticity, meaning they are more easily compressed when the load from the front to the back is small than when it is large. Conical coil springs have the advantage that the coil portions do not interfere when compressed. The relationship between the load and deflection of a conical coil spring is nonlinear. Therefore, the greater the load applied to the conical coil spring, the smaller the change in deflection of the conical coil spring.

The feel of using the hair iron 10 was compared using three conical coil springs (referred to as spring 1, spring 2, and spring 3) with different spring characteristics. The configuration of each of springs 1, 2, and 3 is as shown in Figures 13 and 14. The table in Figure 13 shows the material, modulus of transverse elasticity, wire diameter, minimum average diameter, maximum average diameter, number of turns, number of turns on the maximum diameter side seat, number of turns on the minimum diameter side seat, spring constant, pitch angle, and effective coil free height of each of springs 1, 2, and 3.

The load of each of the springs 1, 2, and 3 was calculated using the following formula 1. The deflection of each of the springs 1, 2, and 3 was calculated using the following formula 2.
Calculation formula 1: π×d ⁴ ×G×(α−d′/(2×π×Rs))/(32×Rs ² )
Calculation formula 2: n/(R2-R1)×16×P×(Rs ⁴ −R1 ⁴ )/(G×d ⁴ )+π×α×(R2 ² −Rs ² )−d′×(R2−Rs))
In the calculation formulas 1 and 2, d: wire diameter, G: modulus of transverse elasticity, α: pitch angle, d': contact pitch in the height direction, Rs: adhesion start radius, R1: minimum average radius, R2: maximum average radius, and P: load.

The load and deflection of each spring 1, 2, and 3 were calculated using formulas 1 and 2. The calculation results and graphs are shown in Figures 15 and 16. According to the graph in Figure 16, the load that results in the same amount of deflection is the highest for spring 3 and the lowest for spring 1.

Several hairdressers were asked to evaluate the usability of hair irons 10 using springs 1, 2, and 3 as the elastic member 41. The results are as follows: The usability of hair irons 10 using spring 3 as the elastic member 41 is better than that of hair irons 10 using springs 1 and 2 as the elastic member 41. The usability of hair irons 10 using spring 2 as the elastic member 41 is better than that of hair irons 10 using spring 1 as the elastic member 41. These evaluation results show that the more tangible the displacement of plate 40 a user feels, the better the usability. In other words, in addition to being able to easily displace plate 40 with a weak force, users feel that the tangible tangible response to the displacement of plate 40 makes it easier for the user to transmit the movement of their fingertips to plate 40, resulting in a better usability.

Next, we will explain an example of how to use the hair iron 10 of this embodiment. The hair iron 10 is palm-sized and has small length and width dimensions. Because the plate 40 of the hair iron 10 is small, it is suitable for detailed styling of bangs, sideburns, etc.

Charging of the battery 25 begins when the USB cable 21 is inserted into the hair iron 10 and connected to the power supply. The display 14 will indicate when charging of the battery 25 is complete. Once charging of the battery 25 is complete, unplug the USB cable 21. The hair iron 10 can be used cordlessly, making it ideal for use on the go.

The hair iron 10 operates not only on the battery 25 but also on power from a power supply connected via the USB cable 21. Figure 12 is a flowchart illustrating the process when the power supply is connected to the hair iron 10 via the USB cable 21. This process begins when the power supply is connected to the hair iron 10 via the USB cable 21 and the hair iron 10 is turned on. When the process begins, the control circuit of the hair iron 10 determines whether the output of the power supply is higher than a predetermined value (e.g., 36 W) (S10). If the output of the power supply is determined to be higher than the predetermined value (S10: YES), the control circuit of the hair iron 10 uses the power from the power supply to increase the temperature of the heating element 44 (S11). On the other hand, if the output of the power supply is determined to be lower than the predetermined value (S10: NO), the control circuit of the hair iron 10 determines whether the battery 25 is sufficiently charged (S12). If the battery 25 is determined to be insufficiently charged (S12: NO), the control circuit charges the battery 25 (S13). On the other hand, if it is determined that the battery 25 is sufficiently charged (S12: YES), the control circuit of the hair iron 10 uses power from the battery 25 to increase the temperature of the heating element 44 (S14). This flowchart ends when the power to the hair iron 10 is turned off.

The user removes the cap case 17 and moves the operating part 35 of the locking member 33 to the unlocked position, opening the hair iron 10. If the user attempts to force the hair iron 10 open without moving the operating part 35 to the unlocked position, the first locking part 31 and the second locking part 32 will come into contact. This allows the user to realize that the hair iron 10 is locked. If the user still attempts to force the hair iron 10 open, the contact force between the first locking part 31 and the second locking part 32 will increase, causing the locking member 33 to move to the unlocked position. This prevents damage to the base end 12 of the hair iron 10.

After opening the hair iron 10, the user slides the switch 28 forward. The power is turned on, and the hair iron 10 operates using power from the battery 25 or the power supply. If the battery 25 is not sufficiently charged, the display 14 will indicate this. The temperature of the heating element 44 will rise to the set temperature quickly (approximately 40 seconds) after the power is turned on.

The user places their hair between the pair of arms 13A and 13B. The plate 40 displaces to fit closely to the hair. Because the stroke of the plate 40 is large, the surface of the plate 40 easily fits tightly to the hair. Furthermore, because the plate 40 displaces easily with a weak force, the user feels that the movement of their fingertips is easily transmitted to the plate 40.

The heat from the heating element 44 is efficiently transferred to the surface plate 42 by the carbon-containing thermally conductive layer 43. The entire surface of the plate 40 heats up uniformly, and the plate 40 applies heat evenly to the hair. Far infrared rays are also radiated from the carbon-containing thermally conductive layer 43 to the hair. This allows the hair to be quickly styled while retaining moisture. The protrusions 19 on the comb-shaped portion 18 also improve the flow of the hair.

The heat from the heating element 44 is efficiently transferred to the surface plate 42 by the carbon-containing thermally conductive layer 43, preventing it from becoming trapped inside the housing 24. Furthermore, the heat inside the housing 24 is efficiently released to the outside by the comb-shaped portion 18. This prevents the outer surface of the clamping portion 15 from becoming too hot, allowing the user to grip the outer surface of the clamping portion 15 and operate the hair iron 10.

After using the hair iron 10, the user slides the switch 28 to the power-off position to turn it off. Then, the user closes the hair iron 10 and moves the operating part 35 of the locking member 33 to the locked position. This causes the first locking part 31 and the second locking part 32 to face each other vertically, keeping the hair iron 10 locked. The user then puts on the cap case 17.

Even if you forget to move the switch 28 to the power-off position and close the hair iron 10, the switch 28 can be moved to the power-off position by putting the cap case 17 on. Therefore, the hair iron 10 can be prevented from being left in the power-on state.

Next, the operation and effects of the embodiment configured as described above will be explained. The hair iron 10 of this embodiment has arms 13A and 13B extending from the base end 12. The arms 13A and 13B each have a plate 40 that is long in the extension direction, and an elastic member 41 that supports the back side of the plate 40. The elastic member 41 has nonlinear elasticity that makes it easier to compress when the load from the front side to the back side is small than when it is large. With this configuration, the plate 40 displaces with a small force, making it easier to bring the plate 40 into uniform contact with the hair. Therefore, the plate 40 does not need to be pressed hard against the hair, allowing for good hairstyles without damaging the hair. Furthermore, because the plate 40 displaces with a small force, it can respond to delicate finger movements.

In addition, the elastic member 41 supports the plate 40 at two points in the extension direction. With this configuration, the entire plate 40 is supported in a balanced manner, making it easier for the entire plate 40 to come into even contact with the hair.

The elastic member 41 is a conical coil spring. This configuration allows for sufficient deflection in a small space, making it possible to achieve compactness. In addition, it is easy to design the reaction force of the elastic member 41 to an appropriate value.

<Other Examples>
The present invention is not limited to the embodiments described above and illustrated in the drawings, and the following embodiments are also included within the technical scope of the present invention.
(1) In the above embodiment, the hair iron 10 is a straightening iron in which hair is sandwiched between a pair of arms 13A and 13B. However, the hair iron is not limited to this, and may be a curling iron having a cylindrical arm extending from a base end and a plate along the outer periphery of the arm, in which hair is sandwiched between the arm and the plate.
(2) In the above embodiment, the carbon-containing thermally conductive layer 43 is a flexible sheet. However, the carbon-containing thermally conductive layer is not limited to this, and may be a hard plate member or a layer to which a carbon material is sprayed.
(3) In the above embodiment, the elastic member 41 is a conical coil spring. However, the elastic member is not limited to this, and may be any member that is easier to compress when the load from the front side to the back side is small than when it is large. For example, the elastic member may be a block-shaped member made of an elastic material, or may be a combination of multiple spring members. When combining multiple elastic members, members with different elastic forces may be combined. The elastic member may also be rubber, a leaf spring, a variable pitch coil spring, a tapered coil spring, etc.
(4) In the above embodiment, the small diameter portion 41A of the conical coil spring is disposed on the plate 40 side, and the large diameter portion 41B is disposed on the housing 24 side. However, this is not limiting, and the small diameter portion of the conical coil spring may be disposed on the housing side, and the large diameter portion may be disposed on the plate side.
(5) In the above embodiment, the elastic member 41 supports the plate 40 at two locations. However, the present invention is not limited to this, and the elastic member may support the plate at three or more locations.
(6) In the above embodiment, the battery 25 is rechargeable. However, the battery is not limited to this and may be, for example, a dry cell battery.
(7) In the above embodiment, the dimensions of the plate 40 are shown as an example. However, the dimensions of the plate are not limited to these and can be changed as appropriate.

10... Hair iron 12... Base end portion 13... Arm portion 40... Plate 41... Elastic member

Claims (3)

An arm portion extending from the base end portion,
The arm portion includes a plate that is long in the extension direction and an elastic member that supports a back side of the plate,
The elastic member has nonlinear elasticity that makes it easier to compress when the load from the front side to the back side of the plate is small than when the load is large. The hair iron according to claim 1, wherein the elastic member supports the plate at two or more points in the extension direction. A hair iron according to claim 1 or claim 2, wherein the elastic member is a conical coil spring.