Patent Publication Number: US-9420839-B2

Title: Air permeable headwear

Description:
TECHNICAL FIELD 
     The present invention relates to a headwear that has secured air permeability, has a good exterior appearance and a high degree of freedom in design, and has improved production efficiency. 
     BACKGROUND ART 
     In the related art, a headwear having ventilation holes in its body, a headwear in which a mesh material is used in a part or an entire part of the fabric of the body, and other headwears are known as air permeable headwears. 
     According to a method of forming ventilation holes in the body, although ventilation holes having a diameter of approximately 1 mm to 5 mm are formed at a number of appropriate positions, since the ventilation holes are small, it is difficult to secure air permeability sufficient for giving a sense of refreshing feeling. Moreover, when a mesh material is used in a part of the fabric of the body, although it is possible to secure air permeability, since sunlight reaches directly the portion formed of a mesh material, the wearer cannot experience a sense of sufficiently refreshing feeling. Further, when ventilation holes are formed in the body and a mesh material is used in a part of the fabric of the body, the appearance is not satisfactory. 
     Patent Document 1 discloses a headwear in which ventilation portions are formed in a front surface of the crown and a length adjustment belt having a bag-shaped central portion and configured to receive a sweat absorbing mechanism and other heat absorbing mechanisms as necessary is attached to a front-half portion of the inner circumference of the lower end of the crown. According to this invention, although air incoming from the ventilation portions flows downward from voids appearing between the front surface of the belt and the inner circumferential surface of the crown, countermeasures against the sun glare and the foreign materials entering from the ventilation portions are not taken. 
     Moreover, when the length adjustment belt is tightly fastened to the forehead, since voids appear between the front surface of the belt and the inner circumferential surface of the crown and air incoming from the ventilation portions of the crown flows downward from the voids, the forehead is cooled with the flowing air and wetting and sweating of the head can be prevented. However, since one end of the belt except the bag-shaped portion is sewn to an inner circumferential end of the crown and the other end protrudes outward from the other circumferential end so as to be connected to an adjuster, the adjuster appears on the exterior appearance of the headwear. Moreover, it is difficult to attach the belt to the headwear. 
     Patent Document 2 discloses a headwear in which an inlet aperture for introducing air into the headwear is provided in the front of the crown above the level of the peak, a baffle or a blade is provided so as to be suspended from an upper edge of the inlet aperture, and an outlet aperture is provided in an occipital region of the crown. According to this invention, a mild turbulence created by the baffle or the blade in a region extending from the inlet aperture to the outlet aperture covers the top of the head of the wearer of the headwear to thereby create a cooling effect. However, since outside air from the front of the headwear is blocked by the baffle or the blade, the outside air will not come into direct contact with the forehead of the head of the wearer of the headwear, which is a region most sensitive to cool air. Moreover, in this invention, since the aperture is formed of a fabric, it is impossible to reliably maintain the aperture. 
     In Japanese Unexamined Patent Application Publication No. 2013-019088 (Patent Document 3), the present inventor has proposed a headwear in which an aperture is formed in the front and rear portions of the body and a louver mechanism including a louver frame and a blade plate is fixed to the aperture as a headwear which has air permeability and light shading properties and an excellent exterior design. Since the headwear of this invention has air permeability and light shading properties, the wearer can experience a sense of sufficiently refreshing feeling. However, since apertures need to be formed in the body and the louver mechanism needs to be fixed to the apertures, it is difficult to manufacture the headwear and the headwear is not appropriate for mass production. 
     Patent Document 1: Microfilm of Japanese Utility Model Registration Application No. S55-100319 (Japanese Unexamined Utility Model Registration Application, Publication No. 557-027427) 
     Patent Document 2: Japanese Patent No. 4516689 
     Patent Document 3: Japanese Unexamined Patent Application, Publication No. 2013-019088 
     DISCLOSURE OF THE INVENTION 
     Problems to be Solved by the Invention 
     The present invention provides a headwear which is capable of securing both air permeability and light shading properties and which can be easily manufactured. The outside air comes into direct contact with the forehead of the head of the wearer of the headwear, which is a region most sensitive to cool air, whereby a cooling effect is enhanced. 
     Moreover, the present invention provides a louver-attached headwear which has secured air permeability and has good exterior appearance and a high degree of freedom in design. 
     Means for Solving the Problems 
     A headwear of the present invention is a baseball cap-type headwear in which a peak is provided in a front lower end of a head circumferential portion and a crown is connected to an upper end of the head circumferential portion, in which a front portion of the head circumferential portion is formed as an inclined surface that widens in an outward direction of the headwear as the inclined surface advances toward a lower end, the front lower end of the head circumferential portion is connected to both sides of one end of the peak but is not connected to a central portion of one end of the peak so that a void is formed between the peak and the head circumferential portion, and the central portion of one end of the peak is positioned on an inner side of the headwear more than the front lower end of the head circumferential portion, and at least the front portion of the head circumferential portion and the peak are integrally molded from a synthetic resin. 
     Preferably, the front portion and both sides of the head circumferential portion and the peak are integrally molded from a synthetic resin. 
     Preferably an entire circumference of the head circumferential portion and the peak are integrally molded from a synthetic resin. 
     Preferably, the headwear is a baseball cap-type headwear in which a slide adjuster is provided on an inner side of the head circumferential portion, the slide adjuster includes a band and a buckle which are formed from a synthetic resin, a sawtooth-shaped engagement groove formed on an outer surface of the band engages with an engagement claw of the buckle, and in the engagement state, the band can freely advance in relation to the buckle but cannot retract, the buckle includes a buckle body which includes a bottom plate, a roof frame facing the bottom plate, and both side plate connecting the bottom plate and the roof frame, and in which an insertion space for the band is provided and an operating board which is provided horizontally on an inner side of the roof frame and in which an engagement claw is formed on a lower surface of one end thereof so as to engage with the engagement groove of the band and a pressing portion for disengaging the engagement is provided on the other end, and the operating board is supported by a connecting shaft that is provided at an intermediate position between the engagement claw and the pressing portion so as to connect with both side plates or the roof frame so that the operating board can freely swing about the intermediate position, a height of the pressing portion is the same as or lower than the roof frame, and the buckle is fixed to an inner side of the head circumferential portion with the roof frame interposed. 
     Preferably, the band and the head circumferential portion are integrally molded from a synthetic resin. 
     A headwear of the present invention is a headwear in which a peak is provided on a front side, in which the peak and a head circumferential portion are integrally molded from a synthetic resin, a louver for introducing air into a headwear body along a surface of the peak is provided on the peak, and a size adjustment belt is provided on an inner side of the head circumferential portion closer to the peak. 
     Preferably, an attachment portion for attaching the size adjustment belt is provided on the inner side of the head circumferential portion. 
     Preferably, the size adjustment belt is molded integrally with the head circumferential portion. 
     Preferably, a size adjustment mechanism of the size adjustment belt is an american hook-type adjuster. 
     Preferably, a size adjustment mechanism of the size adjustment belt is a slide adjuster. 
     Effects of the Invention 
     In the headwear according to the present invention, the front lower end of the head circumferential portion is connected to both sides of one end of the peak but is not connected to the central portion of one end of the peak so that the void is formed between the peak and the head circumferential portion, and at least the front portion of the head circumferential portion and the peak are integrally molded from a synthetic resin. Due to this, it is possible to secure a void easily between the peak and the head circumferential portion. Moreover, since the central portion of one end of the peak is positioned on the inner side of the headwear more than the front lower end of the head circumferential portion, outside air is introduced into the headwear from the void along the peak and makes direct contact with the forehead of the head of the wearer, which is a region most sensitive to cool air. Thus, a cooling effect is improved remarkably. Further, since the front portion of the head circumferential portion is formed as an inclined surface that widens in an outward direction of the headwear as the inclined surface advances toward the lower end, it is possible to prevent entering of sunlight or a foreign material from the void. In addition, since the headwear according to the present invention is configured such that the crown is connected to the upper end of the head circumferential portion, it is very easy to manufacture the headwear. 
     Further, according to the headwear in which the size adjustment belt is provided on the inner side of the head circumferential portion closer to the peak, a size adjustment mechanism such as a slide adjuster does not appear outside, and the gap in the front portion of the headwear is concealed by the peak. Thus, a degree of freedom in design is provided. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1A  is a side view of a headwear of the present invention; 
         FIG. 1B  is a side view illustrating a front portion of a head circumferential portion and the peak separated from the crown; 
         FIG. 2  is a vertical sectional side view illustrating a wearing state of the headwear illustrated in  FIG. 1A ; 
         FIG. 3  is a perspective view of a headwear according to another embodiment of the present invention, illustrating a slide adjuster provided on the inner side of a head circumferential portion when seen from above a left front portion of the headwear; 
         FIG. 4A  is a plan view of a slide adjuster including a band and a buckle; 
         FIGS. 4B and 4C  are vertical sectional side views taken along line z-z; 
         FIG. 5  is a bottom view of the headwear illustrated in  FIG. 3 ; 
         FIG. 6  is a perspective view illustrating a headwear in which a head circumferential portion and a band are integrally molded from a synthetic resin; 
         FIG. 7  is a side view of a headwear illustrating another embodiment of the present invention; 
         FIG. 8  is a bottom view of the headwear illustrated in  FIG. 7 ; 
         FIG. 9  is a perspective view of a size adjustment belt of the headwear illustrated in  FIG. 7 ; and 
         FIGS. 10A, 10B, and 10C  are perspective views of a size adjustment belt of a headwear according to another embodiment of the present invention. 
     
    
    
     EXPLANATION OF REFERENCE NUMERALS 
       2 : Crown 
       3 : Head circumferential portion 
       3   a : Front portion of head circumferential portion 
       4 : Peak 
       4   a : Both sides of one end of peak 
       4   b : Central portion of one end of peak 
       5 : Void 
       6 : Gap 
       7 : Louver 
       8 : Slide adjuster 
       9 : Size adjustment belt 
       10 : Band 
       12 : Engagement groove 
       20 : Buckle 
       22 : Roof frame 
       24 : Buckle body 
       30 : Operating board 
       31 : Engagement claw 
       32 : Pressing portion 
       40 A: One end of size adjustment belt 
       40 B: The other end of size adjustment belt 
     PREFERRED MODE FOR CARRYING OUT THE INVENTION 
     Hereinafter, embodiments of an air permeable headwear according to the present invention will be described based on the drawings. 
       FIG. 1A  is a side view of a headwear according to the present invention and illustrates a crown  2 , a head circumferential portion  3 , and a peak  4  that constitute the headwear.  FIG. 1B  is a side view illustrating a front portion  3   a  of the head circumferential portion and the peak  4  separated from the crown  2 . 
     The peak  4  is provided in a front lower end of the head circumferential portion  3  and the crown  2  is connected to the upper end of the head circumferential portion  3 . The front portion  3   a  of the head circumferential portion  3  and the peak  4  are integrally molded from a synthetic resin, and the crown  2  is connected to the upper end of the head circumferential portion  3  by sewing or the like. 
     The front portion  3   a  of the head circumferential portion  3  is formed as an inclined surface that widens in an outward direction of the headwear as the inclined surface advances toward the lower end. Due to this, it is possible to prevent sunlight and a foreign material from entering into the headwear from a void described later. Although the angle of the front portion  3   a  of the head circumferential portion  3  is not particularly limited, the front portion  3   a  may have such an angle that entering of sunlight and a foreign material can be effectively prevented. 
     The lower end of the front portion  3   a  of the head circumferential portion  3  is connected to both sides  4   a  at one end of the peak  4  and is not connected to a central portion  4   b  of one end of the peak  4 . Due to this, a void  5  is formed between the peak  4  and the head circumferential portion  3 . 
     Since the front portion  3   a  of the head circumferential portion  3  and the peak  4  are integrally molded from a synthetic resin, the void  5  is reliably secured in the front portion of the headwear. Moreover, by just connecting the crown  2  to the upper end of the head circumferential portion  3 , it is possible to easily manufacture a headwear having the void  5  between the front portion  3   a  of the head circumferential portion  3  and the peak  4 . 
     As a material of the front portion  3   a  of the head circumferential portion  3  and the peak  4 , a synthetic resin such as polyester, polypropylene, polyethylene, polycarbonate, or ABS resin can be used. The front portion  3   a  of the head circumferential portion  3  and the peak  4  can be easily integrally molded using a mold due to having a simple structure.  FIG. 1B  is a side view illustrating the front portion  3   a  of the head circumferential portion  3  and the peak  4  molded integrally, separated from the crown  2 . 
     Subsequently, the action of the headwear according to the present invention will be described using  FIG. 2 .  FIG. 2  is a vertical sectional side view illustrating a wearing state of the headwear illustrated in  FIG. 1A . 
     Since the central portion  4   b  of one end of the peak  4  is positioned on the inner side of the headwear more than the lower end of the front portion  3   a  of the head circumferential portion  3 , outside air W from the front side of the headwear is introduced into the headwear from the void  5  along the upper portion of the peak  4  without being blocked in the midway. In the present embodiment, as clearly shown in  FIG. 2 , only the central portion  4   b  of one end of the peak  4  is laterally positioned to an interior of the lower end of the front portion  3   a  of the head circumferential portion  3 . In addition, as shown in  FIG. 2 , a horizontal axis H bisects the void  5 . A portion of the lower end of the front portion  3   a  of the head circumferential portion  3  that is not connected to the central portion  4   b  of the one end of the peak  4  has an outermost portion that is positioned entirely above the horizontal axis H. And as shown in  FIG. 2 , an entirety of the peak  4 , including the central portion  4   b  of the one end of the peak  4 , is positioned entirely below the horizontal axis H, and a top surface of the peak  4  is downwardly inclined with respect to the horizontal axis H and forms a straight line from an upper end thereof to a lower end thereof when viewed in side view. Furthermore, as shown in  FIG. 2 , the peak  4  extends laterally from the interior to an exterior of the lower end of the front portion  3   a  of the head circumferential portion  3  such that the peak extends beyond an outermost point of the lower end of the front portion  3   a  of the head circumferential portion  3  in a horizontal direction. Yet still further, as shown in  FIG. 2 , the outermost point of the lower end of the front portion  3   a  of the head circumferential portion  3  and an uppermost point of the peak  4  define the void  5  situated therebetween. 
     According to the present invention, since a large amount of outside air W flowing into the headwear along the peak  4  from the void  5  comes into direct contact with the forehead of the head of the wearer of the headwear, which is a region most sensitive to cool air, and sunlight S is blocked by the front portion  3   a  of the head circumferential portion, the wearer can experience an excellent cooling effect. Moreover, since the front portion  3   a  of the head circumferential portion and the peak  4  are integrally molded from a synthetic resin, it is possible to reliably secure the void  5 . 
     In the present embodiment, although the front portion  3   a  of the head circumferential portion  3  and the peak  4  are integrally molded from a synthetic resin, the entire circumference of the head circumferential portion  3  and the peak  4  may be integrally molded from a synthetic resin. In this case, since the entire circumference of the head circumferential portion  3  serving as the base of the headwear is formed from a synthetic resin, the shape of the entire headwear having the void  5  is maintained. 
     Moreover, when the size adjustment mechanism is provided in the rear portion of the headwear, the front portion  3   a  and both side portions of the head circumferential portion  3  and the peak  4  may be integrally molded from a synthetic resin. 
     Next, another embodiment of the present invention will be described with reference to  FIG. 3 . 
     In this embodiment, a slide adjuster  8  is provided on the inner side of the head circumferential portion  3 .  FIG. 3  is a perspective view of the slide adjuster  8  when seen from above the left front portion of the headwear, illustrating a crown  2 , a head circumferential portion  3 , and a peak  4  that constitute the headwear. The peak  4  is provided in the front lower end of the head circumferential portion  3 , and the crown  2  is connected to the upper end of the head circumferential portion  3 . The entire circumference of the head circumferential portion  3  and the peak  4  are integrally molded from a synthetic resin, and the crown  2  is connected to the upper end of the head circumferential portion  3  by sewing or the like. 
     The slide adjuster  8  provided on the inner side of the head circumferential portion  3  includes a band  10  and a buckle  20  as will be described with reference to  FIG. 4A , and the buckle  20  is fixed to the inner side of the head circumferential portion  3  by a roof frame. 
     Although the fixing is generally realized by sewing, the fixing is not limited to this, and fixing means such as caulking and an adhesive may be used. Since the band  10  and the buckle  20  may be provided in an optional position in the circumferential direction of the head circumferential portion  3 , a disengagement pressing portion  32  described later may be provided at an optional position of the head circumferential portion  3 . 
     Subsequently, the slide adjuster  8  will be described with reference to  FIGS. 4A, 4B, and 4C . 
       FIG. 4A  illustrates a plan view in a slide adjuster including the band  10  and the buckle  20  and  FIG. 4B  is a vertical sectional side view along line z-z in  FIG. 4A . 
     In these figures, a sawtooth-shaped engagement groove  12  is formed on the outer surface of the band  10  having necessary length, width, and thickness so as to extend from a distal end (a portion close to the buckle  20 ) to a terminating end of the band  10 . 
     A main body of the buckle  20  includes a bottom plate  21 , a roof frame  22  facing the bottom plate  21 , and a flat and cylindrical buckle body  24  that includes side plates  23  connecting the bottom plate  21  and the roof frame  22 . A portion of the buckle body  24  in which the band  10  slides is open as an insertion opening, and the inside thereof serves as an insertion space  26  of the band  10 . 
     Since the roof frame  22  constituting the buckle body  24  is formed as a flat plate, the buckle  20  is easily attached to the sweatband. Due to this, it is possible to mass-produce the headwear according to the present invention without incurring much labor and cost. 
     In  FIGS. 4A, 4B, and 4C , although the pressing portion  32  is formed in a small circular form so that the pressing portion  32  is easily pressed by a finger tip of one hand, the pressing portion  32  is not limited to this but may be formed in an angular form. 
     In  FIGS. 4A, 4B, and 4C , a reference numeral  22   a  is a portion of the roof frame  22  facing one end of an operating board  30  and is formed so as to extend horizontally in a direction opposite to the operating board  30 . With the roof frame  22   a , the buckle  20  is reliably fixed to the inner side of the head circumferential portion  3  and the front end of the buckle  20  advances along the lower surface (the surface facing the bottom plate  21 ) of the roof frame  22   a  during sliding of the band  10 . Thus, the roof frame  22   a  also performs the role of a slide guide and a sheath. 
     When the extension length of the roof frame  22   a  has approximately the same length as the band  10 , the length of the slide guide and the sheath is sufficient. 
     On the other hand, in the present embodiment, since the entire circumference of the head circumferential portion  3  is molded from a synthetic resin, the head circumferential portion  3  itself may perform the role of a slide guide and a sheath and an optional portion of the roof frame  22  may be formed as a flat plate. 
     The operating board  30  having such a size that the operating board  30  is received in the roof frame  22  is provided horizontally on the inner side of the roof frame  22 . An engagement claw  31  configured to engage with the engagement groove  12  of the band  10  protrudes from the lower surface of one end of the operating board  30 , and the upper surface of the other end of the operating board  30  serves as the disengagement pressing portion  32 . Since the height of the pressing portion  32  is the same as or lower than the roof frame  22 , even when the headwear is worn with the buckle  20  fixed to the head circumferential portion  3 , it is possible to prevent careless disengagement. 
     A connecting shaft  35  is formed in an intermediate position in the longitudinal direction of the operating board  30 , and the connecting shaft  35  is connected to upper inner walls of both side plates  23 . The cross-sectional shape of the connecting shaft  35  may be a circular shape, an elliptical shape, and other various shapes. The connecting shaft  35  may have an optional shape as long as the connecting shaft  35  supports the operating board  30  so as to freely swing and is not broken after repeated swinging. Even when the connecting shaft  35  is supported by two sides of the roof frame  22  facing the operating board  30  without being limited to both side plates  23 , the same effects as described later can be obtained. 
     The band  10  and the buckle  20  are preferably molded from a flexible synthetic resin. When the band  10  is formed from a synthetic resin, the band  10  can smoothly slide on the lower surface of the roof frame  22   a  or the inner side of the head circumferential portion  3 . 
     Moreover, in order to allow the operating board  30  to swing about the connecting shaft  35 , the buckle  20  is preferably molded from an elastic synthetic resin such as polyacetal, polyoxymethylene, polyamide, or polycarbonate. This buckle  20  is formed of a small number of components and can be easily integrally molded using a mold due to having a simple structure. 
     Next, the action of the headwear illustrated in  FIG. 3  will be described. 
     When one wants to adjust the size of a headwear, the band  10  exposed to the inner side of the head circumferential portion  3  may be directly held with fingertips of one hand, a portion of the head circumferential portion  3  in which the slide adjuster  8  is provided may be held by fingertips of the other hand, and both hands may approach each other. 
     Although the size of the headwear can be decreased with this operation, even when both hands are detached, the size of the headwear will not increase due to the action of the slide adjuster  8  described later. When one wants to increase the size of the headwear, the pressing portion  32  of the slide adjuster  8  may be pressed by fingertips or the like. 
     When the headwear of the present embodiment is worn, although the band  30  makes contact with the forehead but the headwear does not make contact with the forehead, and a gap is formed between the forehead and the headwear (see  FIG. 5 ). Thus, when outside air enters into the headwear from the void  5 , the outside air makes direct contact with the forehead and warm air stored inside the headwear body is discharged outside the headwear body from the gap with the flow of the outside air. 
     Moreover, since the band  30  makes contact with the forehead, the headwear provides a good wearing feeling (in particular, a fitting feeling). Moreover, even when the central portion  4   b  of one end of the peak  4  protrudes toward the inner side of the headwear, it is possible to prevent the peak  4  from making contact with the forehead. 
     Further, a limited region makes contact with the hair, even when the headwear is worn, mess-up of the hair can be reduced remarkably. 
     In the present embodiment, an aperture  41  is formed in a portion of the head circumferential portion  3  corresponding to the pressing portion  32  of the slide adjuster  8 , and the pressing portion  32  is visible from the aperture  41 . Thus, the disengagement between the band  10  and the buckle  20  can be realized smoothly. 
     Next, the action of the slide adjuster will be described.  FIG. 4B  illustrates a state where the band  10  is inserted in the insertion space  26  of the buckle  20  and the engagement claw  31  of the buckle  20  engages with the engagement groove  12  formed on the outer surface of the band  10 . The cross-sectional shape in the sliding direction of the engagement groove  12  is a sawtooth shape (that is, a shape formed by a tapered surface of which the depth gradually increases in the advancing direction of the band  10  and a wall surface that rises approximately vertically from the deepest position. 
     When the band  10  advances into the insertion space  26  of the buckle body  24  from the side (the left side in  FIG. 4B ) of the pressing portion  32 , the upper surface of the band  10  makes contact with the engagement claw  31  of the operating board  30  and advances while pushing up one end (the side where the engagement claw  31  is formed) of the operating board  30 , and the approaching and separation positions of the band  10  in relation to the buckle  20  are adjusted. In this state, as illustrated in  FIG. 4B , since the engagement claw  31  and the predetermined engagement groove  12  are engaged and locked, the band  10  can freely advance in relation to the buckle  20  but cannot retract. 
     On the other hand, when one wants to retract or pull the band  10  from the buckle  20 , the pressing portion  32  of the operating board  20  is lightly pressed by fingers. As a result, the operating board  30  rotates about the connecting shaft  35  as illustrated in  FIG. 4C , and the engagement claw  31  positioned on the opposite side is raised so that the engagement claw  31  is disengaged from the engagement groove  12 . In this way, the band  10  can be freely slid. When fingers are separated from the pressing portion  32 , the pressing portion  32  returns to its original horizontal state due to elasticity of the synthetic resin. 
     In the present invention, the slide adjuster  8  is not limited to the above-described structure but may have an optional structure as long as a slide adjuster includes such a buckle and band that an engagement groove is formed in the band, the hook of the buckle elastically engages with the groove, and this engagement state is released frequently by a push button that operates approximately in a vertical direction in relation to the band. 
     Moreover, as illustrated in  FIG. 6 , the head circumferential portion  3  and the band  10  may be integrally molded from a synthetic resin. In this case, since it is possible to eliminate the labor of fixing the band  10  to the head circumferential portion  3  and to reliably fix the band  10  to the head circumferential portion  3 , the headwear can be manufactured more easily. 
     Hereinafter, an embodiment of the headwear according to the present invention will be described based on the drawings. 
       FIG. 7  is a side view of a headwear according to the present invention and illustrates a crown  2 , a peak  4 , and a head circumferential portion  3  that constitute the headwear. 
     Since the peak  4  and the head circumferential portion  3  are integrally molded and a louver  7  is formed on the peak  4 , it is possible to manufacture a louver-attached headwear easily just by fixing the crown  2  to the molded product. A method of fixing the crown  2  is not particularly limited and an optional method that can allow easy fixing and provide strength such as sewing, welding, or attachment using a surface fastener may be used. 
     The shape and size of the peak  4  are not particularly limited but are appropriately determined by taking the design into consideration as long as the light shading properties can be secured. In the present embodiment, although the peak  4  has a curved shape, the peak  4  may have a planar shape. 
     The shape and size of the louver  7  formed on the peak  2  are not particularly limited, and optional shape and size may be used as long as air can be introduced to the inner side of the crown  2  along the surface of the peak  2 . In the present embodiment, although the louver  7  is formed in an approximately half-moon shape, the louver  7  may have a trapezoidal shape, a circular shape, a rectangular shape, or other various shapes. 
     Next, the action of the headwear illustrated in  FIG. 7  will be described. 
     Since the louver  7  is formed on the peak  4 , outside air is introduced along the surface of the peak  4  from the louver  7  and the louver  7  blocks sunlight entering into the headwear body. According to the headwear of the present invention, since a large amount of outside air flowing from the louver  7  comes into direct contact with the head of the wearer of the headwear and the sunlight is blocked by the louver  7 , the wearer can experience an excellent cooling effect. 
     Moreover, since the head circumferential portion  3  is integrally molded from a synthetic resin, the holding feeling when the headwear of the present invention is worn is improved. 
     Since the head circumferential portion  3  is molded from a synthetic resin, the size adjustment belt  9  is provided on the inner side of the crown  2 .  FIG. 8  is a bottom view of the headwear illustrated in  FIG. 7 . The size adjustment belt  9  may be molded integrally with the head circumferential portion  3 , and an attachment portion may be provided on the inner side of the head circumferential portion  3  so that the size adjustment belt  9  can be attached to the inner side of the head circumferential portion  3 . When the size adjustment belt  9  is molded integrally with the head circumferential portion  3 , since a step of attaching the size adjustment belt  9  can be eliminated, the efficiency of manufacturing the headwear increases. On the other hand, if the size adjustment belt  9  can be detached from the head circumferential portion  3 , the size adjustment belt  9  can be easily replaced when the belt is destroyed or contaminated and one wants to replace the size adjustment mechanism. Since the size adjustment belt  9  is provided on the inner side of the headwear, the size adjustment mechanism is not visible from the outside of the headwear. 
     When the headwear of the present invention is worn, although the size adjustment belt  9  makes contact with the forehead but the crown  2  does not make contact with the forehead, and a gap  6  is formed between the forehead and the crown  2 . Thus, when outside air enters into the crown  2  from the louver  7 , the outside air makes direct contact with the forehead and warm air stored inside the crown  2  is discharged outside the crown  2  from the gap  6  with the flow of the outside air. Moreover, since the size adjustment belt  9  makes contact with the forehead, the headwear provides a good wearing feeling (in particular, a fitting feeling). Since the size adjustment belt  9  is provided on the side of the peak  4 , the gap  6  is concealed by the peak  4  and a good exterior appearance is provided. 
     Although materials of the peak  4 , the head circumferential portion  3 , and the louver  7  are not particularly limited, these portions can be molded from a flexible synthetic resin, and in particular, are preferably molded from an elastic synthetic resin such as polyacetal, polyoxymethylene, polyamide, polycarbonate, or nylon. 
     Next, a size adjustment mechanism of the size adjustment belt  9  of the present embodiment will be described with reference to  FIG. 9 .  FIG. 9  is a perspective view illustrating the size adjustment belt  9  of the headwear illustrated in  FIG. 8 . The size adjustment mechanism is an american hook-type adjuster in which male hooks  41 A are formed in one end  40 A of the size adjustment belt  9  and female hooks  41 B are formed in the other end  40 B. Although the number and interval of the hooks are not particularly limited, approximately seven hooks are formed at an interval of 3 mm to 10 mm. 
     When one wants to adjust the size, by moving the position at which the male hooks  41 A engage with the female hook  41 B, the inner circumference of the headwear can be fit to a size desired by the wearer. 
     Next, another embodiment of the present invention will be described with reference to  FIGS. 10A, 10B, and 10C . In the present embodiment, the size adjustment mechanism is configured as a slide adjuster. 
       FIG. 10A  is a perspective view illustrating a size adjustment belt  9  of the headwear of the present embodiment. 
     A slide guide  42  is formed in one end  40 A of the size adjustment belt  9  and has a portion having such a loop shape that the other end  40 B can be inserted, and claw-shaped engagement convex portions  44 A are formed on the inner side of a retaining ring  43  of the slide guide  42  as illustrated in  FIG. 10B . 
     On the other hand, engagement concave portions  44 B having a sawtooth cross-sectional shape are formed on the outer surface of the other end  40 B. In the present embodiment, both ends  40 A and  40 B are slid so that both engagement portions  44 A and  44 B engage with each other and the band is adjusted to a length optimal to the wearer. In a state where the claw-shaped engagement convex portions  44 A are locked at the engagement concave portions  44 B having a sawtooth cross-sectional shape, the other end  40 B can freely advance in relation to one end  40 A and cannot retract. 
     The size adjustment belt is formed from vinyl chloride, polyethylene, other flexible synthetic resins, or hard rubber. In this case, the band is preferably molded in advance into a curved surface following the head of the wearer. 
     Since the size adjustment belt  9  of the present embodiment is configured in the above-described manner, when both ends of the size adjustment belt  9  are retracted, both engagement portions  44 A and  44 B slide each other, and the other end  40 B advances into the slide guide  42 , whereby the circumferential length of the size adjustment belt  9  can be decreased. In this state, even when the other end  40 B is pulled in a direction of being separated from one end  40 A, since both engagement portions  44 A and  44 B engage with each other, the size adjustment belt  9  is not moved. 
     On the other hand, when one wants to disengage both engagement portions  44 A and  44 B to pull the other end  40 B from one end  40 A, a side portion (in particular, the position of the retaining ring  43 ) of the slide guide  42  may be pressed by fingers from the outer side so that the retaining ring  43  is bent outward (upward in  FIG. 10B ). In this case, as illustrated in  FIG. 10C , both engagement portions  44 A and  44 B are disengaged, whereby the other end  40 B is retracted from one end  40 A, and the band is naturally loosened. 
     In the size adjustment belt  9  according to the present invention, a method of engaging both ends of the belt is not particularly limited. Besides the above-described embodiment, a surface fastener or the like may be employed.