Door lock having multiple locking bolts

Details Door lock having multiple locking bolts Door lock having multiple locking bolts

1997-05-19

1998-10-13

Barrett, Suzanne Dino

Locks

Special application

For closures

70118, 292 34, E05B 5900

Patent

active

058195629

ABSTRACT:
A door lock has four separate locking bolts operated or controlled by a single key-operated tumbler lock. The key-operated lock is located directly above two conventional external doorknobs, in a conventional arrangement, so that a would-be thief is unaware of the fact that the door lock contains four locking bolts, rather than the two locking bolts that are conventionally used. The four locking bolts achieve a level of security that is not attainable with the conventional two locking bolt arrangement.

REFERENCES:
patent: 1535210 (1925-04-01), Dyer
patent: 1627420 (1927-05-01), Thomas
patent: 1908980 (1933-05-01), Heyel
patent: 2094369 (1937-09-01), Millice
patent: 3266276 (1966-08-01), Yulkowski
patent: 4322958 (1982-04-01), Eigemeier
patent: 4481796 (1984-11-01), Hamme
patent: 4962653 (1990-10-01), Kaup
patent: 5027625 (1991-07-01), Krachten
patent: 5265920 (1993-11-01), Kaup et al.
patent: 5495731 (1996-03-01), Riznik

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