Abstract: A locking device includes a housing, a base, an electromagnetic sensor, a locking hook, a locking mechanism having a locking bolt and a linking member, and a key having a first end formed with a mechanical unlocking portion and a second end formed with an electromagnetic unlocking portion. Thus, the locking device can be opened by the mechanical unlocking portion of the key and the electromagnetic unlocking portion of the key, thereby enhancing the versatility of the locking device.

Abstract: A card type locking apparatus having a chamber enclosed by an upper half and a lower half and having a slidable element, a spring, and four spring plungers in the chamber. When a card plate with raised blocks acting as security codes thereon is inserted into a preset opening provided on the locking apparatus, the raised blocks lift the spring plungers and urge the pin rods mounted on the spring plungers to align horizontally. When the card plate is pressed further the four pin rods enter a window formed on the upper half, which results in the backward movement of the slidable element and the release of the hook, producing the unlocked state.