Patent ID: 7856857
Filing Date: 2010-12-28
Classification: E05B,E05C,Y10T

Abstract:
1. A door lock of key-driven transmission structure comprising: a case with a lock-bolt through hole, a lock-tongue through hole; a lock-bolt structure transversely installed in the case, the lock-bolt structure having a lock-bolt head which extends through the lock-bolt through hole, and the lock-bolt structure further having a first transverse guide slot, in which a rod from a base plate of the case is inserted, and also a longitudinal slot at an outer edge between the lock-bolt head and the first transverse guide slot on the lock-bolt structure; a swing arm hinged on the base plate and on the opposite side of the longitudinal slot of the lock-bolt structure; a first link bar with one end hinged on the swing arm, and the first link bar striding across the lock-bolt structure, whereof a guide slot is defined between two ends of the first link bar and the rod is inserted therein, whereby when the first link bar is driven by the swing arm, rotation of the first link bar is limited by the rod; a second link bar with one end hinged on the first link bar and driven by first link bar to rotate, another end of the second link bar is hinged on the lock-bolt structure near the longitudinal slot, whereby the lock-bolt structure is driven by the second link bar causing the lock-bolt head to shrink in or extend out through the lock-bolt through hole; a labor saving component is installed on the second link bar, whereof the labor saving component is connected with the first link bar and the lock-bolt structure, thereby making transverse translation of the lock-bolt structure in a more labor saving and convenient way; a first transmission piece hinged on the base plate of the case near the longitudinal slot, said first transmission piece has a first end and a second end, the first end is inserted into the longitudinal slot, when the lock-bolt structure is translated transversely, the first end is driven by the longitudinal slot to rotate the first transmission piece; an actuator provided with a transverse slot corresponding to the second end of the first transmission piece, the top and bottom ends of the actuator are respectively connected with two pull rods, whereof each pull rod is connected with an auxiliary lock-bolt, and the actuator and the two pull rods are driven by the first transmission piece to move up and down to push the two top and bottom lock-bolts out for locking action; at least one push piece hinged on the case and has a push face; a second transmission piece hinged on the case, in which the second transmission piece has a third end and a fourth end, whereof the third end is installed against and pushed by the push piece, and the rotating direction of the push piece is different from the rotating direction of the second transmission piece; and a lock-tongue structure which is transversely installed on the case, whereof the lock-tongue structure is installed with a lock-tongue head which can be extended through the lock-tongue through hole, a stop part is installed at the opposite end on the lock-tongue structure far away from the lock-tongue head, whereof the side facing lock-tongue of the stop part is pushed against by the fourth end of the second transmission piece, whereby the stop part is pushed by the hinged rotation of the second transmission piece to make the lock-tongue structure translate inward transversely, another side of the stop part is pushed by an elastic component installed on the case to make the lock-tongue structure translate to the lock-tongue through hole transversely.