Helmet and method for manufacturing helmet

Abstract

A helmet includes a helmet shell and an impact absorber arranged at an inner side of the helmet shell. The impact absorber includes a hemispherical main body and an inserted member. The main body includes an insertion recess in an outer surface of the main body, the insertion recess defines an insertion space between the outer surface of the main body and an inner surface of the helmet shell, and the insertion space is open toward a fitting opening of the helmet shell. The inserted member is press-fitted into the insertion space.

1 . A helmet, comprising:
 a helmet shell; and   an impact absorber arranged at an inner side of the helmet shell, wherein   the impact absorber includes:
 a hemispherical main body including an insertion recess in an outer surface of the main body, the insertion recess defining an insertion space between the outer surface of the main body and an inner surface of the helmet shell, the insertion space being open toward a fitting opening of the helmet shell; and 
 an inserted member that is press-fitted into the insertion space. 
   
     
     
         2 . The helmet according to  claim 1 , wherein the main body includes the insertion recess at a location covering a side of a head of a wearer. 
     
     
         3 . The helmet according to  claim 1 , wherein
 the main body and the inserted member are molded products of a same resin foam, and   a portion of the main body where the insertion space is defined has an expansion ratio equal to that of the inserted member.   
     
     
         4 . The helmet according to  claim 1 , wherein the inserted member has a thickness of 3 mm or greater and 30 mm or less. 
     
     
         5 . The helmet according to  claim 1 , wherein the inserted member is removable from the insertion space. 
     
     
         6 . The helmet according to  claim 1 , wherein
 the main body includes:
 a first member located at a position corresponding to a top of a head; 
 a second member having an annular shape and arranged entirely around the head at a lower side of the first member; 
 two third members located at positions corresponding to right and left sides of the head at a lower side of the second member; 
 two fourth members located at positions corresponding to right and left cheeks of the head at lower sides of the third members; and 
 a fifth member located at a position corresponding to a mouth and a chin of the head and connecting ends of the fourth members, 
   each of the third members is a member defining the insertion space that receives the inserted member between the inner surface of the helmet shell and an outer surface of the third member, and   the impact absorber includes a total of nine components.   
     
     
         7 . The helmet according to  claim 6 , wherein among the total of nine components, the first member has a density that is the lowest and the second member has a density that is second to the lowest. 
     
     
         8 . The helmet according to  claim 6  or  7 , wherein the second member has a density lower than that of the third members and lower than or equal to that of the inserted member. 
     
     
         9 . The helmet according to  claim 6 , wherein the third members have a density higher than or equal to that of the inserted member. 
     
     
         10 . The helmet according to  claim 6 , wherein
 the third members have a density lower than or equal to that of the fourth members, and   the inserted member has a density lower than that of the fourth members.   
     
     
         11 . The helmet according to  claim 6 , wherein
 the fifth member has a density higher than or equal to that of the fourth members, and   the density of the fifth member is the highest.   
     
     
         12 . The helmet according to  claim 6 , wherein the second member has a vertical width between the first member and the third members that is less than a vertical width of other regions. 
     
     
         13 . The helmet according to  claim 6 , wherein in the second member, a vertical width of a portion corresponding to a back of the head is greater than a vertical width between the first member and the third members and a vertical width of a portion corresponding to a front of the head. 
     
     
         14 . The helmet according to  claim 6 , wherein at least one of the first member, the second member, the third members, the fourth members, the fifth member, and the inserted member includes a blind hole. 
     
     
         15 . The helmet according to  claim 14 , wherein the blind hole includes:
 a hole extending through one member selected from a group of components consisting of the first member, the second member, the third members, the fourth members, the fifth member, and the inserted member, the hole including a first end in an outer surface of the one member and a second end in a first abutting surface of the one member, the first abutting surface abutting a second abutting surface of another member selected from the group or components to abut the one member; and   a closing portion included in the second abutting surface and closing the second end of the hole.   
     
     
         16 . The helmet according to  claim 15 , wherein the hole is included in the first member and the closing portion is included in the second member. 
     
     
         17 . The helmet according to  claim 1 , wherein the main body includes the blind hole. 
     
     
         18 . A method for manufacturing a helmet, the helmet including a helmet shell and an impact absorber arranged at an inner side of the helmet shell, the method comprising:
 attaching the impact absorber to the inner side of the helmet shell, wherein   the impact absorber includes a hemispherical main body, the main body including an insertion recess in an outer surface of the main body, the insertion recess defining an insertion space between the outer surface of the main body and an inner surface of the helmet shell, the insertion space being open toward a fitting opening of the helmet shell, and   during the attaching, after the main body is attached to the inner side of the helmet shell, an inserted member is press-fitted into the insertion recess.