Double cylinder safety lock

Details Double cylinder safety lock Double cylinder safety lock

1976-06-28

1978-01-17

Wolfe, Robert L.

Locks

Operating mechanism

Key

70DIG42, 70DIG60, E05B 910

Patent

active

040685101

ABSTRACT:
A double cylinder safety lock has a bolt projected and retracted by a device having a rotatable hub. A key operated exterior device has a lost-motion connection to the rotatable hub so the key can be extracted from the device with the bolt in projected position or retracted position. A key operated interior device has either a direct or a lost-motion connection (depending upon the key used) to the rotatable hub, the hub connections being arranged to turn together. A key for the interior device can project and retract the bolt but can be extracted only when the bolt is in retracted position.

REFERENCES:
patent: 1564463 (1925-12-01), Best
patent: 1850586 (1932-03-01), Heyer
patent: 2042025 (1936-05-01), Schlage
patent: 2691290 (1954-10-01), Schlage

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