| 摘要 |
<p>A bump resistant pin-tumbler lock having a housing; a plug rotatably mounted within the housing and having a keyway; and a shear line defined between the interface between the plug and housing. The plug has one or more pin chambers extending from and orthogonally to the shear line and the keyway, wherein each pin chamber is capable of housing a bottom pin and is aligned with a corresponding driver chamber when the plug is in a locked position. Each driver chamber extends into the housing from and orthogonally to the shear line, includes a biasing means and is capable of housing one or more top pins. The plug further includes a bottom pin retaining means extending into one of the pin chambers so as to selectively retain a predetermined bottom pin in its respective pin chamber and prevent the predetermined bottom pin from fully extending into the pin chambers, such that, in use, kinetic energy cannot be transferred to the predetermined bottom pin from a bump member.</p> |
