Patent ID: 6941622

Claim:
A hook capable of hooking a chain at a desired length comprising a hook body, and a buckle above the hook body; the buckle having a U shape opening; width of the U shape opening being confined by the size of a chain to be hung thereon; the buckle having a penetrating groove which penetrates two inner sides of the buckle, one outer side of the buckle and the penetrating groove is formed with a groove opening at the outer side; a spring and a movable shaft passing through the penetrating groove; the movable shaft being positioned by a pin so that the spring is compressed by the movable shaft and the movable shaft will not drop out of the buckle; a notch being formed at a predetermined portion of the movable shaft; a semi-round groove being formed at a coupling portion of the buckle and the notch, and the semi-round groove being positioned across the two inner sides of the buckle; wherein in assembly, the spring and the movable shaft are inserted into the penetrating groove from the groove opening of the penetrating groove at the outer side of the buckle; the spring is positioned at a non-penetrating side; the notch is exposed out from the buckle; then, a ring of a chain is placed into the inner sides of the U shape buckle with one end of the first ring exactly passes through the notch so, that the first ring is positioned in the inner side; of the shape notch; then the ring is driven into the semi-round groove and a second ring exactly resists against a top surface of the semi-round groove; then the movable shaft is released so as to move out by the resilient force of the spring and thus the ring will release out from the notch; as a result, the ring resists against the movable shaft instead of the notch; finally, the pin is inserted into the buckle and the movable shaft so as to prevent the chain from releasing out; thereby, the chain S is positioned.