Rim lock with classroom function

Details Rim lock with classroom function Rim lock with classroom function

1978-11-30

1982-02-02

Lyddane, William E.

Locks

Special application

For closures

70 92, 70DIG27, 70DIG42, 292 92, 292DIG65, E05B 6506, E05B 6510

Patent

active

043133207

ABSTRACT:
An improved and simplified dead bolt rim lock, which provides "classroom function". A dead bolt is fixed on a draw plate slidable in a rim lock case and having a cross slot which extends one way from center and is engaged by a crank pin movable in an 180.degree. arc between front and rear centered positions. The crank pin is on a crank arm carried by a turnknob rotatable in the rim lock case, and its projecting end lies in the path of a cam mounted for rotation in the back plate of the case and connected for operation from a key-actuated cylinder mounted in the outside face of the door. For classroom function, the turnknob has a limited throw and has lost motion relative to the crank arm so as to allow retraction of the bolt by the turnknob but prevent its advancement thereby to locked position.

REFERENCES:
patent: 1495820 (1924-05-01), Tierney
patent: 1908980 (1933-05-01), Heyel
patent: 2136539 (1938-11-01), Brinton
patent: 4047408 (1977-09-01), Johns et al.

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