Abstract: A double locking device includes two identical sliders movable close to or separate from one another. The slider has a sliding dock and a latch lock located on the sliding dock. The sliding docks of the two sliders may be moved close to each other and the latch locks may be latched securely through movable hooks. The latch lock is controllable for switching to an unlocking condition or a locking condition. In the unlocking condition, the movable hooks may be moved to a separation position so that the movable hooks release the latching relationship. In the locking condition the two movable hooks cannot be moved in order to maintain the latching relationship and prevent the two sliders from being separated.

Abstract: A lock mechanism for latching a first object then coupling with a second object includes a case, a first shackle and a second shackle. The case includes a bolt assembly. The first shackle may be selectively coupled with the case to form a closed boundary with the case and latch the first object at a latch position, and unfasten the closed boundary at a release position. At the latch position, the first shackle is latched and anchored by the bolt assembly. The second shackle is movably mounted on the case and may latch the second object at a first position and release the second object at a second position.