| 摘要 |
PURPOSE: An auxiliary key for a door is provided to prevent the door from being unlocked from the outside by embedding the auxiliary key in the door, to make the exterior appearance good, and to prevent accidents caused by collisions by almost removing protruded parts. CONSTITUTION: An auxiliary key for installing a door mounted with a knob to a doorframe and fixing the door not to be separated from the door is composed of a key connecting tool(10) having a key groove(11') for inserting a rotary bar(11) into a door lock cylinder(5) having a key groove(5') into which a key(6) is inserted from the outside; a lever(12) rotated by a locking lever(24) and the key connecting tool rotated by the key and formed with wings(12') at both sides; and upper and lower operating plates formed with operating spaces at which the wings are positioned, and connected with upper and lower locking shafts(18,17) locked at the upper and lower sides of the door to move up and down.
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