Patent ID: 8113021

Claim:
A door lock with an improved structure having a turning device on the outer side of a door, the turning device comprising: a positioning base on the outer side of the door, which has a through hole; a hollow circular spacer, which penetrates from the inner side of the positioning base outwards through the through hole and whose one end is pivotally connected to the inner side of the positioning base; a limiting element, which is vertically disposed in the circular spacer on the outer side of the positioning base, whose center has a connecting hole, and whose one end has a protruding part extending out of the circular spacer for its user to press; wherein a stopping part protrudes from the circular spacer between the protruding part and the connecting hole, the end of the protruding part of the limiting element is urged by an elastic element disposed in the circular spacer, and the circular spacer has space for the limiting element to move along the depressing direction of the protruding part; a connecting shaft, whose one end goes through the positioning base and is positioned in the circular spacer outside the positioning base with the end extending out of the connecting hole of the limiting element, the diameter of the connecting hole being larger than the diameter of the connecting shaft; a lock control device, which is disposed in the circular spacer inside the positioning base, wherein the connecting shaft also goes through the lock control device to control its lock state; and a handle, which has a junction hole on one side for mounting on the circular spacer outside the positioning base, a concave hole at a position corresponding to the protruding part of the limiting element and in communication with the exterior for the protruding part to fall into and to block, and a lock having a lock core whose one end allows the insertion and turning of a key and whose other end has inward grooves on two opposite sides, respectively, for a stopping part of the limiting element to fall into when the lock is unlocked, one end of the groove being connected with the extended end of the connecting shaft so as to move the connecting shaft as it turns; wherein the stopping part of the limiting element falls into the grooves on the lock core end of the lock when the door lock is unlocked for the limiting element to retreat into the circular spacer as the protruding part is depressed, and the stopping part of the limiting element mismatches with the grooves on the lock core end of the lock when the door lock is locked for the limiting element not to retreat into the circular spacer as the protruding part is depressed because of the block of the outer edge of the lock core.