| 摘要 |
The present invention relates to a lock, and more particularly, to an anti-bumping lock cylinder. The anti-bumping lock cylinder comprises a lock cylinder barrel, a lock cylinder housing , columns of pin channels in rows in the lock cylinder barrel and the lock cylinder housing, which are arranged in communication with each other, lower pins in the pin channels of the lock cylinder barrel, cover pins at the top of the pin channels of the lock cylinder housing, springs, upper pins, and a key hole; and the lock cylinder is characterized in that an anti-bumping pin is provided in at least one column of each row of the pin channels of the lock cylinder barrel, the anti-bumping pin being suspended in the pin channel of the lock cylinder barrel, the upper edge of the anti-bumping pin being lower than the plane of the lock cylinder barrel and the lower edge of the anti-bumping pin being higher than the bottom of the pin channel of lock cylinder barrel. A cylindrical thin pin is provided beneath each of the springs. When a bump key is bumped strongly, the bits of the bump key bump only the normal lower pins but not the anti-bumping pins. Further, due to the function of the cylindrical thin pin, it is even hard for the upper pins opposite to the anti-bumping pins to be ejected out of the pin channels of the lock cylinder barrel, which remain jammed between the upper and lower pin channels, so that the lock cylinder cannot be opened and security is ensured.
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