Lock with latch bolt for door or window

Details Lock with latch bolt for door or window Lock with latch bolt for door or window

1999-05-12

2001-06-19

Gall, Lloyd A. (Department: 3627)

Locks

Special application

For closures

C070S143000, C292S039000, C292S140000, C292S150000, C292S165000, C292S170000

Reexamination Certificate

active

06247342

ABSTRACT:

FIELD OF INVENTION
The invention concerns a lock with a latch bolt for a door or a window.
BACKGROUND OF THE INVENTION
The latch bolt of a door lock serves to latch the door automatically when the door is closed and to hold the door in the closed position. The latch bolt can be retracted into the lock from its normal position against spring pressure in order to release the door. This retraction of the latch bolt can be caused by a button-actuated hub and/or by a key-operated element, e.g. a lock cylinder, via appropriate mechanical elements. Such a latch bolt does not have an anti-burglary function, such as, e.g., as is exerted by a key-operated bolt of the lock. On the one hand, the amount of its projection into the strike plate on the door or window frame is too little for this, on the other hand a latch bolt easily can be pushed back into the lock against the spring force from outside by means of a suitable instrument, which for example acts on the inclined surface of the latch bolt.
SUMMARY OF THE INVENTION
The object of the invention is to design a lock of the above-mentioned kind so that the latch bolt also has a burglary prevention function, preferably with the anti-burglary function corresponding to a key-operated bolt.
In the case of the lock in accordance with the invention, a translating part can be moved by turning the hub in the direction opposite the opening direction so that it moves the latch bolt out of its normal position by an additional amount out of the lock, so that it extends into the strike plate on the side of the door or window frame with a sufficient depth of penetration. Preferably the latch bolt is blocked against being drawn into the lock in this extended position.


REFERENCES:
patent: 1553947 (1925-09-01), Lindberg
patent: 2370370 (1945-02-01), Neer et al.
patent: 3828592 (1974-08-01), Horgan, Jr.
patent: 4691542 (1987-09-01), Young
patent: 4691543 (1987-09-01), Watts
patent: 5290077 (1994-03-01), Fleming
patent: 0 466 677 (1992-01-01), None
patent: 2 203 414 (1974-05-01), None
patent: 2 439 283 (1980-05-01), None
patent: 2 540 170 (1984-08-01), None
patent: 2 215 770 (1989-09-01), None

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