Patent ID: 8534100

Claim:
A door lock, with a center, two ends, and a transmission mechanism controlled by a key, for a door, comprising: a main lock ensemble at the center of the door lock; two auxiliary lock ensembles, an one auxiliary lock ensemble on each end of the door lock; and two long bars, one long bar connecting one auxiliary lock ensemble to the main lock ensemble; wherein the main lock ensemble includes a housing with a pivotal part that automatically returns to an original position after pivotally rotating to a fixed angle; the pivotal part drives a first connecting bar to move vertically and a second connecting bar to swing as the pivotal part rotates; a third connecting bar pivotally attached to the housing; the first connecting bar movably mounted on the third connecting bar, the first connecting bar capable of driving the third connecting bar to swing as the first connecting bar moves vertically; one end of the third connecting bar engages a vertical bar with two ends to move, vertically; a position limiting element within the housing positions the vertical bar at an unlocked state; each end of the vertical bar connects to one long bar of one auxiliary lock ensemble for controlling the long bar to open or close the door lock; the second connecting bar drives a lock tongue to retract into or extend out of the housing as the second connecting bar swings; a lock core in the housing driven by the key to shift shifts a lock chip horizontally; a positioning element in the housing adjacent to the lock chip urges and positions the lock chip; and the lock chip when horizontally shifted by the lock core prevents the vertical bar from moving so that the lock tongue is not extended by the pivotal part.