| 摘要 |
An anti-theft lock includes a cylinder having multiple upper pin holes and a core is rotatably received in the cylindrical recess and has multiple lower pin holes which communicate with the upper pin holes. Each lower pin hole includes a shoulder located close to the wall of the core. A lower pin, an upper pin, a spring and a cap are installed into the aligned lower pin hole and upper pin hole in sequence. A special lower pin, a special upper pin, one of the springs and one of the caps are received in one of the aligned upper pin hole and lower pin hole. The special upper pin includes ridges rested on the shoulder of the lower pin hole and a gap is defined between the special upper pin and the special lower pin.
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