Enhanced door lock capable of being locked from inner side of doorplate

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.