| 摘要 |
A Spring Bolt Guard consisting of a metal or plastic 'U' shape with a base plate, wherein a locating screw hole has been drilled, which base plate extends out into the 'U' shape from the base of the 'U' shape such that when the described form is screwed into the spring bolt retaining cavity cut into the door frame the top of the 'U' shape fills the gap between the door frame and the door edge thus preventing plastic or metal shims being used to force the spring bolt back into the lock housing and by this means allowing the door to be illegaly opened without the use of a key.
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