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专利名称：Retrofit doorknob lock apparatus发明人：Maxwell G. Atchisson申请号：US06/049079申请日：19790618公开号：US04285221A公开日：19810825
摘要：Apparatus for securing a doorknob against unauthorized entry. A shroud fitsover the entire doorknob and its associated shaft, and extends to fit on or over the rosethrough which the shaft extends. A clevis fits through slots in the shroud to retain theshroud in place on the door knob and shaft. The present apparatus can be used toretrofit a lock onto an existing knob which has no locking structure, and also preventstampering or unauthorized access to an existing built-in lock cylinder of a doorknob.
申请人：ATCHISSON; MAXWELL G.
代理机构：Jones, Thomas & Askew
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