Helmet buckle

Abstract

The present disclosure relates to a helmet buckle. The helmet buckle according to the present disclosure comprises: a base part ( 100 ) for guiding a band part ( 400 ) to slide when the band part ( 400 ) advances or retreats; a locking part ( 200 ) rotatably coupled to the base part ( 100 ), and fastened to the band part ( 400 ); and an operating part ( 300 ) which is rotatably coupled to the base part ( 100 ), and which rotates the locking part ( 200 ) so as to separate the locking part ( 200 ) from the band part ( 400 ) if the operating part rotates at least a predetermined angle with respect to the base part ( 100 ).

1 . A helmet buckle comprising:
 a base part configured to guide a band part to slide when the band part advances or retreats;   a locking part rotatably coupled to the base part and fastened with the band part; and   an operating part rotatably coupled to the base part and configured to rotate the locking part to separate the locking part from the band part when the operating part is rotated more than a predetermined angle with respect to the base part.   
     
     
         2 . The helmet buckle according to  claim 1 , wherein the locking part has a first engaging portion on a side,
 wherein the operating part has, on a side, a second engaging portion that the first engaging portion engages,   wherein while the operating part is rotated up to the predetermined angle with respect to the base part, the first engaging portion and the second engaging portion are spaced apart from each other, and   wherein when the operating part is rotated more than the predetermined angle with respect to the base part, the first engaging portion engages the second engaging portion.   
     
     
         3 . The helmet buckle according to  claim 2 , wherein the operating part has a predetermined space on a side,
 wherein the second engaging portion is formed at a boundary of the predetermined space,   wherein while the operating part is rotated up to the predetermined angle with respect to the base part, the first engaging portion is moved with respect to the operating part in the predetermined space, and   wherein when the operating part is rotated more than the predetermined angle with respect to the base part, the first engaging portion engages the second engaging portion.   
     
     
         4 . The helmet buckle according to  claim 3 , wherein the predetermined space is formed in a receding portion recessed at the side of the operating part, and
 wherein the second engaging portion is formed as a step formed at a boundary of the receding portion.   
     
     
         5 . The helmet buckle according to  claim 3 , wherein the first engaging portion is formed in a plate shape and disposed in the predetermined space. 
     
     
         6 . The helmet buckle according to  claim 1 , wherein the locking part includes:
 a fastening portion rotatably coupled to the base part and fastened with the band part; and   a first engaging portion protruded from two sides of the fastening portion in a direction, and   wherein the operating part has a receding portion recessed at two sides, and a second engaging portion is formed as a step formed at a boundary of the receding portion.   
     
     
         7 . The helmet buckle according to  claim 6 , wherein while the operating part is rotated up to the predetermined angle with respect to the base part, the first engaging portion is moved with respect to the operating part in the receding portion, and
 wherein when the operating part is rotated more than the predetermined angle with respect to the base part, the first engaging portion engages the second engaging portion.   
     
     
         8 . The helmet buckle according to  claim 2 , wherein the locking part is rotatably coupled to the base part by a first rotation axis,
 wherein the operating part is rotatably coupled to the base part by a second rotation axis, and   wherein the second rotation axis is farther away from the first engaging portion and the second engaging portion than the first rotation axis.   
     
     
         9 . The helmet buckle according to  claim 1 , wherein before the operating part is rotated with respect to the base part, the operating part fastens the locking part with the band part by applying pressure to the locking part. 
     
     
         10 . The helmet buckle according to  claim 9 , wherein the locking part has a first engaging portion on a side,
 wherein the operating part has, on a side, a third engaging portion that the first engaging portion engages, and   wherein before the operating part is rotated with respect to the base part, the first engaging portion engages the third engaging portion.   
     
     
         11 . The helmet buckle according to  claim 10 , wherein the operating part has a predetermined space on a side, and
 wherein the third engaging portion is formed at a boundary of the predetermined space.   
     
     
         12 . The helmet buckle according to  claim 11 , wherein the predetermined space is formed in a receding portion recessed at a side of the operating part, and
 wherein the third engaging portion is formed as a step formed at a boundary of the receding portion.   
     
     
         13 . The helmet buckle according to  claim 11 , wherein the first engaging portion is formed in a plate shape and disposed in the predetermined space. 
     
     
         14 . The helmet buckle according to  claim 1 , wherein the base part includes:
 a bottom portion extended in a plate shape; and   a pair of partition walls extended from two sides of the bottom portion, facing each other, such that the locking part is rotatably coupled to one portion, and the operating part is rotatably coupled to the other portion.   
     
     
         15 . The helmet buckle according to  claim 1 , further comprising:
 an elastic means to provide an elastic force to the operating part in a direction toward the band part.   
     
     
         16 . The helmet buckle according to  claim 15 , wherein the elastic means is a torsion spring, and
 wherein an end of the torsion spring is coupled to the operating part, and an opposite end of the torsion spring is supported on a first rotation axis rotatably coupling the locking part to the base part.