Patent ID: 8869354

Claim:
A ratchet buckle for helmets comprising; a ratchet adapted to be fastened to a strap provided inside the helmet, wherein multiple tabs for engagement are provided on a surface of the ratchet, and a buckle comprising: a base member which is a basic structure of the buckle; an operating member which is rotatably assembled to the base member via a pin through which coil springs are inserted, wherein the operating member is biased by the coil springs in a first direction in which a distal end of the operating member moves toward the base member, said distal end being defined as a rear end distanced more from the pin than a proximal end which is a front end; and an engagement/releasing member having an engagement part and a center convex part, which engagement/releasing member is rotatably assembled via the pin between the base member and the operating member, wherein the engagement part and both ends of the center convex part are configured to selectively engage with one of the multiple tabs, respectively, when an end of the ratchet is inserted into the buckle, wherein this engagement is releasable by pulling up the operating member provided on the buckle; wherein when the operating member is pulled up and rotated in a second direction in which the rear end of the operating member moves away from the base member, a front end of the operating member contacts a front end of the engagement/releasing member, and when the operating member is further pulled up and rotated in the second direction, the front end of the operating member pushes the front end of the engagement/releasing member to move together in the second direction, the engagement part and both ends of the center convex part of the engagement/releasing member rotate to release an engagement with the tab of the ratchet.