Side Release Buckle

Abstract

A side release buckle includes a plug and a socket into which the plug is inserted for engagement. The plug includes: a base being provided with a belt attachment and a pair of legs; and an engaging portion being formed to each of the legs. The socket includes: a body being provided with a belt attachment and an insertion opening; a housing space being formed in the body and capable of housing the legs inserted from the insertion opening; and an engaged portion being formed in the body and engageable with the engaging portion. The body includes an undulation being continuously formed in an insertion direction of the legs on at least one of top and bottom surfaces of the body.

1 . A side release buckle comprising:
 a plug; and   a socket into which the plug is inserted for engagement, wherein   the plug comprises: a base being provided with a belt attachment and a pair of legs; and an engaging portion being formed to each of the legs,   the socket comprises: a body being provided with a belt attachment and an insertion opening; a housing space being formed in the body and capable of housing the legs inserted from the insertion opening; and an engaged portion being formed in the body and engageable with the engaging portion, and   the body comprises an undulation being continuously formed in an insertion direction of the legs on at least one of top and bottom surfaces of the body, the undulation being provided by a linear concave formed on an outer surface of the body and a linear convex formed on an inner surface of the body along the linear concave.   
     
     
         2 . The side release buckle according to  claim 1 , wherein
 the undulation is located in the housing space at an intermediate position between portions in which the pair of legs are housed respectively.   
     
     
         3 . The side release buckle according to  claim 2 , wherein
 the engaging portion is formed at a tip end of each of the legs and has a dimension in a top-bottom direction larger than each of the legs, and   the linear convex is provided by opposing linear convexes formed on both top and bottom surfaces of the body with a gap therebetween the opposing linear convexes smaller than a gap between portions in which the linear convex is not formed.   
     
     
         4 . The side release buckle according to  claim 2 , wherein
 the undulation also functions as a guide to guide the engaging portion to the engaged portion when the legs are inserted.   
     
     
         5 . The side release buckle according to  claim 1 , wherein
 a cutout extending along the undulation from an edge of at least one of the insertion opening and the belt attachment is formed in the top and bottom surfaces of the body.   
     
     
         6 . The side release buckle according to  claim 5 , wherein
 the cutout has a C-shaped or U-shaped outline.   
     
     
         7 . The side release buckle according to  claim 5 , wherein
 the cutout comprises a U-shaped deep cutout extending from the belt attachment and a C-shaped shallow cutout extending from the insertion opening.   
     
     
         8 . The side release buckle according to  claim 5 , wherein
 the cutout comprises the cutout extending along the belt attachment, the cutout being formed with a projection projecting along the belt attachment as portions facing both ends of the belt attachment.   
     
     
         9 . The side release buckle according to  claim 5 , wherein
 the plug comprises a connecting portion configured to connect the pair of legs,   an inner shape of the legs and the connecting portion is a C-shape or U-shape, and   the cutout comprises the cutout extending along the belt attachment, an outline of the cutout being formed along the inner shape of the legs and the connecting portion.