Double cylinder lock with key retention

Details Double cylinder lock with key retention Double cylinder lock with key retention

1978-07-03

1980-10-21

Frazier, Roy D.

Locks

Operating mechanism

Key

70134, 70389, 70DIG42, 70DIG60, E05B 910, E05B 1100, E05B 1704

Patent

active

042286697

ABSTRACT:
A double cylinder lock constructed with a single tailpiece driver and a clutch. The interior lock key can be extracted only when the lock bolt is retracted and not when the lock bolt is extended. The driver and clutch arrangement prevent either cylinder from becoming out of time, regardless of which cylinder is used to throw the bolt.

REFERENCES:
patent: 818719 (1906-04-01), Webb
patent: 1598551 (1926-08-01), Brauning
patent: 1639535 (1927-08-01), Russo
patent: 2100233 (1937-11-01), Beaumont
patent: 2712749 (1955-07-01), Quigley et al.
patent: 3123995 (1964-03-01), Russell et al.
patent: 3799592 (1974-03-01), Babb, Jr. et al.
patent: 4068510 (1978-01-01), Neary
patent: 4109496 (1978-08-01), Allemann et al.

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