| 摘要 |
The present invention is directed to a lock with a master cylinder that is highly resistant to pulling. The lock comprises a lock body 10 with a hole, a master cylinder 20 rotatably mounted within the cylindrical hole of the lock body, and tumbler unit 30 mounted in the master cylinder wherein at least one metal pull resistant element 40 is inserted between the outer surface of the master cylinder and the inner surface of the wall of the cylindrical hole in the lock body. The metal pull resistant element prevents the master cylinder from being pulling out of the lock body in an axial direction. The metal pull resistant element 40 may be a ball, a cylinder or a block inserted 20 and held in place between an indentation 21 provided on the outer surface of master cylinder and an annular concavity provided on the inner wall surface of the cylindrical hole for the master cylinder in the lock body 10 and at a location opposite to the indentation 21. The metal pull resistant element 40 may be inserted via a cylindrical aperture 12 in the wall of the lock body 10. The cylindrical aperture is then sealed with a plug screw 50 after the metal pull resistant element has been inserted. The presence of the metal pull resistant element between the master cylinder and the lock body of the lock of the present invention provides an effective means for providing a high pulling resistance of the master cylinder in an axial direction to enhance lock security.
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