Helmet

Abstract

A helmet is disclosed. A helmet according to an exemplary embodiment of the present invention may include: a helmet body capable of surrounding a user's head; a fixing member which is fixed to a side surface of the helmet body and has a cam seat part; a movable member coupled to the fixing member so as to be linearly movable forward or backward; a pivot member which has a cam pivotally seated on the cam seat part and is disposed to be engaged with the movable member so as to be pivotable around the cam as a pivot axis; and a pressing member disposed in the fixing member to elastically support the cam and press the cam backward, wherein when the pivot member pivots from a first position toward a second position, the pivot axis moves forward and the pivot member and the movable member are accordingly displaced forward.

1 . A helmet, comprising:
 a helmet body configured to surround a user's head;   a fixing member fixed to a side surface of the helmet body and having a cam seat part;   a movable member coupled to the fixing member so as to be linearly movable forward or backward;   a pivot member which has a cam pivotally seated on the cam seat part and is disposed to be engaged with the movable member so as to be pivotable around the cam as a pivot axis; and   a pressing member disposed in the fixing member to elastically support the cam and press the cam backward,   wherein when the pivot member pivots from a first position toward a second position, the pivot axis moves forward and the pivot member and the movable member are accordingly displaced forward.   
     
     
         2 . The helmet of  claim 1 , wherein the cam seat part and the cam have a profile in which the cam is displaced forward when the pivot member pivots from the first position toward the second position. 
     
     
         3 . The helmet of  claim 2 ,
 wherein the cam has a triangular shape including a first corner part, a second corner part, and a third corner part, and the cam seat part provides one or more support surfaces surrounding the cam, and   wherein in the cam at the first position, a first cam surface between the first corner part and the second corner part is supported by a first support surface on the rear side of the cam seat part, and the third corner part is in contact with the pressing member.   
     
     
         4 . The helmet of  claim 3 ,
 wherein the pressing member is disposed on the front side of the cam seat part, and   wherein in the cam at the second position, a second cam surface between the second corner part and the third corner part is in contact with the pressing member, and the first corner part is in contact with the first support surface.   
     
     
         5 . The helmet of  claim 3 , wherein the first corner part, the second corner part, and the third corner part protrude toward a cam seating surface of the cam seat part so as to be in contact with the cam seating surface, and the cam seating surface is not in contact between the first corner part and the second corner part, between the second corner part and the third corner part, and between the third corner part and the first corner part. 
     
     
         6 . The helmet of  claim 1 ,
 wherein the fixing member further comprises a pivot guide part for providing a pivot profile of the pivot member in front of the fixing member, and   wherein the pivot member further comprises a pivot guided part guided by the pivot guide part during pivoting with the cam as a pivot axis.   
     
     
         7 . The helmet of  claim 6 , wherein the movable member comprises a first pivot support part engaged with the pivot guided part to prevent the pivot member from being separated when the pivot member is pivoted. 
     
     
         8 . The helmet of  claim 7 , wherein when the movable member reaches a predetermined position in front of the fixing member at the second position, the engagement between the pivot guided part and the first pivot support part is released to separate the pivot member. 
     
     
         9 . The helmet of  claim 8 , wherein the movable member further comprises a fixing means for fixing the movable member in a state in which the movable member reaches the predetermined position in front. 
     
     
         10 . The helmet of  claim 9 , wherein at least a part of the fixing means protrudes outward from the helmet body by elasticity to fix the movable member in a state in which the movable member reaches the predetermined position in front. 
     
     
         11 . The helmet of  claim 10 , wherein the pivot member further comprises a pressing part wherein when it is coupled to the movable member in a state in which the movable member is fixed by the fixing means, the fixed state of the movable member by the fixing means is released to press the fixing means toward the helmet body so that the pivot guided part and the first pivot support part are engaged with each other. 
     
     
         12 . The helmet of  claim 11 , wherein the fixing member further comprises a pressing part pivot part for providing a pivot path of the pressing part when the pivot member is pivoted. 
     
     
         13 . The helmet of  claim 7 ,
 wherein the pivot member further comprises a pivot auxiliary part at a position spaced rearward from the pivot guided part at a predetermined interval, and   wherein the movable member further comprises a second pivot support part engaged with the pivot auxiliary part to prevent the pivot member from being separated when the pivot member is pivoted.   
     
     
         14 . The helmet of  claim 1 , further comprising a first elastic member disposed between the fixing member and the pressing member to elastically support the pressing member. 
     
     
         15 . The helmet of  claim 1 , further comprising a second elastic member disposed between the fixing member and the movable member to press the pressing member rearward.