Patent ID: 9591895
Date: 2017-03-14
CPC Classifications: A44B,Y10T

Claim:
1. A buckle, of which an engagement claw can be engaged with a serrate engagement groove formed on an outer surface of a band, the buckle comprising: a buckle main body composed of a base plate and a roof frame opposed to each other, and two side plates connecting the base plate and the roof frame, wherein an inside of the buckle main body is an insertion space for the band; and an operation piece horizontally installed inside the roof frame, and having, on an under surface of one end thereof, the engagement claw that can be engaged with the engagement groove of the band, wherein an other end thereof is a pressing portion for releasing the engagement, wherein the operation piece is movably supported by a connecting shaft connecting the two side plates at an intermediate point, thereby allowing the operation piece to swing around the intermediate point as a fulcrum, wherein the buckle main body is provided with a control piece having a surface that is obliquely inclined relative to a direction perpendicular to a plane in which the band extends, and the control piece faces toward an upper surface of the operation piece so as to function as a spring and controls a swing of the operation piece, wherein the connecting shaft and the buckle main body are separate, individual components, and wherein in a locked state in which the engagement claw is engaged with the engagement groove of the band, when the band further enters the insertion space of the buckle main body, a top face of the band comes in contact with the engagement claw of the operation piece, and the band advances while pushing up the one end of the operation piece and while the operation piece contacts the control piece, and then the operation piece returns to an initial position by recoil force of the control piece, thereby allowing the band to advance but not to retreat, relatively to the buckle main body.