Closure fasteners – Extension link – Multiple
Patent
1992-09-30
1993-09-14
Moore, Richard E.
Closure fasteners
Extension link
Multiple
E05C 1732
Patent
active
052442403
ABSTRACT:
A system for locking a door can: (1) lock the door in dead bolt fashion, (2) allow the door to open a limited distance, or (3) allow the door to open freely. The system has a door-mounted latch assembly that includes a base plate, an intermediate link pivoted to the base plate, and a mode selection and latching assembly that is pivoted to the intermediate link. The latch assembly also includes a high strength, "T"-shaped latch member, and camming means to slide the latch member back and forth as a control knob is rotated. A latch plate is mounted on the door frame in juxtaposition to the door-mounted latch assembly. The latch plate has a cylindrical portion with a vertical slot for receiving the "T"-shaped latch member. A cylindrical sleeve fits inside the cylindrical portion of the latch plate. Like the cylindrical portion of the latch plate, the sleeve has a vertical slot for receiving the latch member. The sleeve also has a horizontal slot running perpendicular to and intersecting with the vertical slot. When the latch member is engaged in the cylindrical portion of the latch plate, the cylindrical sleeve can be rotated so that the latch member is engaged with the horizontal slot in the cylindrical sleeve. The latch member then cannot be directly withdrawn from the latch plate.
REFERENCES:
patent: 1029693 (1912-06-01), Klein
patent: 2205156 (1940-06-01), Rowley
patent: 2407900 (1946-09-01), Paul
patent: 3873142 (1975-03-01), Reid
patent: 3924885 (1975-12-01), Markovitch
patent: 3924886 (1975-12-01), Markovitch
patent: 3924887 (1975-12-01), Markovitch
Levenson Alvin S.
Nordmeyer Robert A.
Moore Richard E.
The Brooke-Duveen Group Ltd.
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