Patent ID: 6983518

Claim:
A buckle for belts for connecting a strap-connecting element, the buckle comprising: a first shell unit having a releasing piece; a second shell unit having a first end and a second end opposing the first end connected to the first shell unit and defining an entrance at said first end together with the first shell unit, the second shell unit further having a slit at said second end for connecting a belt and a seat situated between the entrance and the slit; a locking element being pivotally connected to the seat of the second shell unit and having a latch adjacent the entrance, a ledge extending towards the slit, and a shoulder formed between the latch and the ledge; an elastic element being provided at the seat for repositioning the locking element; a moving element being movably installed between the seat and the slit such that the moving element is able to slide relative to the seat; and the buckle being designed such that when the strap-connecting element is inserted into the entrance between the first shell unit and the second shell unit, the shoulder is pushed by the strap-connecting element so that the locking element is pivotally rotated to make the latch lock the strap-connecting element to enlarge a gap between said ledge and a main body of said second shell unit such that the moving element is moved in said gap to contact with the ledge so as to keep the locking element in a state of firmly securing the strap-connecting element; when the releasing piece of the first shell unit is actuated, the releasing piece cooperating with the moving element to move the moving element out of said gap away from the ledge such that said elastic element repositions said locking element to release the latch from the state of locking the strap-connecting element.