Door chain-locking device

Details Door chain-locking device Door chain-locking device

1990-02-26

1991-02-19

Nicholson, Eric K.

Closure fasteners

Extension link

Chain

292DIG41, E05C 1908

Patent

active

049937600

ABSTRACT:
A door chain-locking device comprises a door-frame side locking unit and a door side locking unit. The frame-side locking unit has a locking bolt for permanently securing thereon the fixed-end link of a chain and a case for fixing the locking bolt. The door-side locking unit has an engaging bolt operable to engage thereon one of the middle part's links of the chain fixed at its fixed end link to the door-frame side locking bolt and also to engage the free-ended link of the chain when the door is being closed and to be lifted out of engagement with the free-end link of the chain after disengagement of the middle part's link therefrom.

REFERENCES:
patent: 807779 (1905-12-01), Rinald
patent: 832420 (1906-10-01), Rinaldy
patent: 1575429 (1926-03-01), Lawrence
patent: 1850367 (1932-03-01), Winter
patent: 2881611 (1959-04-01), Callegari
patent: 3071958 (1963-01-01), Russo
patent: 3762752 (1973-10-01), Saunders
patent: 3894762 (1975-07-01), Segal
patent: 3950019 (1976-04-01), Dugan

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