This design is a kind of rope buckle structure with anti falling function, which is made up of buckle base and buckleA movable round bolt is arranged between the upper covers.An indicator push block is arranged on the movable round bolt.The bottom side of the movable round bolt is provided with a return spring.One end of the return spring is pushed against the movable round bolt and the other end is pushed against the fastener base.Make the opening and closing block at the front end of the movable round bolt lean against the limit block of the fastener base.Let the buckle groove of the fastener form a closed space.Limit the clasp on the pet collar to the clasp slot.The leash connecting the buckle can control the dog's movement.The shape of the movable round bolt is slightly three quarters of a round slider.At the fastening centre,Rotate the opening and closing with the central point of the fastener.It can prevent the clasp from moving when the pet is struggling restlessly.Touch and push to the movable round bolt.Make sure that the opening and closing block of the movable round bolt is against the limit block of the fastener base.Not struggling with a pet's restlessness.The retaining ring is pushed to the movable round bolt.Cause the opening and closing block to leave the limit block, so that the pet is lost.本創作是一種具防脫功能之繩帶扣具結構，係藉由扣具底座及扣具上蓋間設有一活動圓栓，該活動圓栓上設有指示推塊，活動圓栓底側設有回復彈簧，回復彈簧一端推抵於活動圓栓另端推抵於扣具底座，使活動圓栓前端的啟閉塊靠合於扣具底座限位塊上，讓扣具的扣槽形成一封閉空間，將寵物項圈上扣環限制於扣槽內，使連接扣環的牽繩可控制狗兒行動，上述活動圓栓外型略為四分之三圓形滑塊，設於扣具中心，以扣具中心點旋轉啟閉，可避免扣環於寵物躁動掙扎左右推擠移動時，碰觸推擠到活動圓栓，確實讓活動圓栓之啟閉塊靠合於扣具底座限位塊上，不會因寵物躁動掙扎時，扣環推擠到活動圓栓，造成啟閉塊離開限位塊因而使寵物走失。
