Patent ID: 6691538
Filing Date: 2004-02-17
Classification: E05B,Y10T

Abstract:
An enhanced door lock capable of being locked from an inner side of a doorplate; the door lock comprising an outer lock portion, an inner lock portion and a lock pull; wherein the door lock is locked on a doorplate and the doorplate is formed by an outer plate and an inner plate;the outer lock portion being installed at an outer side of a lock hole of the outer plate and being formed by an outer lock casing, a lock center, and a ring seat; the inner lock portion being installed at inner side of the lock hole of the inner plate; the inner lock portion being formed by an inner cover and a control knob; the lock pull being installed at a lateral side of the doorplate; the lock pull serving for pulling the lock center of the outer lock portion and the control knob of the inner lock portion; the inner cover being locked to the inner doorplate and the control knob being axially installed in a center of the inner cover and being connected to the lock center; characterized in that: an outer thread is formed on an outer edge of an outer periphery of the ring seat; the outer thread is engageable with an inner thread at an inner edge of the outer lock casing; an interior of the outer plate of the doorplate has a C ring coupled to the outer ring seat; an inner side of the ring seat has connecting ears and an inner side of the C ring are installed with connecting ears; the connecting ears of the C ring are configured with respect to the connecting ears of the ring seat; each connecting ear has a penetrating hole and each connecting ear has a screw hole; the connecting ears of the C ring and connecting ears of the ring seat are locked by screws; thereby, the ring seat and C ring clamp two sides of the outer plate of the doorplate so as to enhance the structure of the doorplate to prevent the door lock from being pulled out; the inner cover is installed with a positioning hole; one side of a top of the control knob is drilled with a stud receiving groove; an inner wall of the stud receiving groove is formed with a spring receiving groove and an inlet; a spring and a bead are received in the spring receiving groove through the inlet, a positioning pin is placed in the stud receiving groove; the positioning pin has an outer sleeve; one end of the outer sleeve is installed with a stud; an inner side of the stud is formed with two positioning grooves; thereby, the outer sleeve and the stud of the positioning pin are coupled with the stud receiving groove; then the bead resisting against the spring exactly pushes the positioning groove of the stud to resist against one positioning groove; wherein, when the control knob rotates to a lock position; the positioning pin will press downwards so that the bead slides to elastically resist against another positioning groove; then, a distal end of the stud exactly inserts into the positioning hole of the inner cover to lock the control knob; thereby, the lock is locked at the inner side of the doorplate.