| 主权项 |
1. A locking device comprising:
a lock including
a housing that includes a housing body, said housing body having an inner surrounding surface that defines an inner space, and a limiting groove that is formed in said inner surrounding surface,a cylindrical core that extends along a core axis into said housing, that is rotatable relative to said housing about the core axis, and that has an insertion end, a helical keyway and a retaining groove, said insertion end being retained in said inner space of said housing body, said helical keyway being formed in an outer surrounding surface of said cylindrical core, and extending through said insertion end to form an opening of said insertion end, said retaining groove being formed in said outer surrounding surface of said cylindrical core, anda tumbler unit that includes a limiting member and a resilient member, said limiting member being mounted to said cylindrical core, being movable relative to said cylindrical core along a limiting axis of the cylindrical core, and having a main body and a limiting projection, said main body extending into said retaining groove and having a driven section that extends into said helical keyway, said limiting projection projecting away from said cylindrical core, and being aligned with said limiting groove in the direction of the limiting axis when said cylindrical core is at a locked position, said limiting projection engaging fittingly said limiting groove to prevent the relative rotation between said cylindrical core and said housing when said limiting member is at an engaged position, said limiting projection being disengaged from said limiting groove to permit the relative rotation between said cylindrical core and said housing when said limiting member is at a disengaged position, said resilient member abutting against said limiting member for biasing resiliently said limiting member to the engaged position when said cylindrical core is at the locked position, so as to prevent the relative rotation between said cylindrical core and said housing; and a key having
a grip section for being held, anda blade section that is connected to said grip section, and that includes a helical blade, said helical blade being capable of being inserted into said helical keyway via said opening of said insertion end of said cylindrical core to access said driven section of said limiting member when said cylindrical core is at the locked position, so as to drive movement of said limiting member to the disengaged position to permit the relative rotation between said cylindrical core and said housing. |
