Patent ID: 7377561

Claim:
A locking and unlocking apparatus of an engine hood door. comprising: a frame which includes an opening at one side of the same and receives various parts including an engine therein; a door which is hinge-rotated about a hinge shaft at the frame for opening and closing the opening; a stay which includes: a first arm of which one side is pivotally connected to the frame by a first fixing joint, and the other side is rotatable; a second arm of which one side is foldably engaged with the other side of the first arm, and the other side is pivotally connected to the door by a second fixing joint, with the stay being foldable with respect to a foldable joint which connects the other side of the first arm and one side of the second arm; a fixing means which allows the door to be fixed at an inclined angle with respect to the hinge shaft when the door is opened, and maintains a fixed state of the stay so that the first arm and the second arm may not be folded; an unlocking means which unlocks the fixed state of the stay when the door is closed; and a remote control switch which overcomes an elastic force of a coil spring and pulls a wire, wherein said fixing means includes: a ring-shaped lock which is extended from the foldable joint of the first arm; a locking piece which is provided at the second arm, with the locking piece being locked by the lock; and a coil spring which is supported by one side of the second arm and allows the locking piece to be elastically biased in a direction that the lock is locked.