Security classroom function lock mechanism

Details Security classroom function lock mechanism Security classroom function lock mechanism

2005-03-01

2005-03-01

Gall, Lloyd A. (Department: 3676)

Locks

Special application

For control and machine elements

C070S224000, C070S467000, C070S478000

Reexamination Certificate

active

06860129

ABSTRACT:
A lock mechanism operated by inner and outer lever handles provides a security classroom function and includes inner and outer lock mechanisms that are independently switchable between locked and unlocked states by inner and outer lock cylinders and keys. The inner handle always operates the lock mechanism to retract a latch bolt. The outer handle can only retract the latch bolt when both the inner and outer lock mechanisms are in the unlocked state. The outer key can retract the latch bolt when the inner lock mechanism is in the locked state, but cannot change the inner lock mechanism to the unlocked state or enable the outer handle, thereby ensuring positive control over the locked state of the outer handle from the inner side.

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Sargent Manufacturing Company,8LineParts List. pp. 8.1 and 8.2.

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