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Expired
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Otto Demke
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Individual
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Individual
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Publication of GB189807730ApublicationCriticalpatent/GB189807730A/en
7730. Demke, O. March 31. Door chains.-The end of the chain has a catch plate f with an undercut bevelled head e which engages with pivoted spring tumblers i in a lock g on the door frame. The lock is operated by a double-bitted key, fitting over a pin l, to disengage the catch plate, the door being pushed open as far as the chain allows to operate the lock from the outside.
GB189807730D1898-03-311898-03-31A Locking Safety Chain for Doors.
ExpiredGB189807730A
(en)