| 摘要 |
PROBLEM TO BE SOLVED: To prevent the breakage of a lock by holding and rotating a decorative ring and to prevent the breakage by forcedly opening the decorative ring and applying a large external force to an exposed cylinder lock. SOLUTION: This lock structure comprises the cylinder lock 31 engagingly fixed to the inside of a fixed cylinder 43, the base end of the fixed cylinder 43 being fixed to a lock box provided within a door through a lock insert hole bored in the door surface; and the substantially conical decorative ring 67 fitted onto the tip-side circumference of the fixed cylinder 43 protruded from the door surface, the rear end of the decorative ring 67 being allowed to abut on the door surface by the energizing force of an energizing means inserted onto the fixed cylinder 43. The fixed cylinder 42 is formed of a double structure consisting of an inner fixed cylinder 45 for engagingly fixing the cylinder lock 31 and an outer fixed cylinder 46 engagingly fixed to the circumference of the inner fixed cylinder 34. The cylinder lock 31 is fixed to the lock box through the inner fixed cylinder 45, and the decorative ring 67 having no hollow part in the section is engagingly fixed to the circumference of the outer fixed cylinder 47, so that the decorative ring 67 side is slipped to the cylinder lock 31.
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