Locks – Special application – For closures
Reexamination Certificate
1998-10-26
2001-12-11
Gall, Lloyd A. (Department: 3627)
Locks
Special application
For closures
C070S109000, C070S110000, C292S167000, C292S169140
Reexamination Certificate
active
06327881
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a locking device for a door, window, or the like, with a main lock casing, at least one additional lock casing and at least one pushrod connecting the additional lock casing with the main lock casing. The additional lock casing has a freely retractable latch bolt, which can be pushed past the normal latch position into its locking position by means of a spring and/or a gear, and which on its side located opposite a leading incline and in the area of the latch end has a protrusion on which a latch restoring lever acts. The latch restoring lever has a first catch, by means of which a pushrod is taken along in the one direction.
BACKGROUND OF THE INVENTION
A pushrod lock is known from DE 35 05 379 C1. The lock connected via a pushrod with a center lock. This pushrod therefore connects the elements of the two locks. In this way it is possible to connect a door with the locking plate on the door frame not only in the center, but also in the area of its corners. In the process of closing the door, the latches are pushed in via the locking plate, so that the door can take up its locked position. For opening the door, the latch of the center lock is actuated by means of a latch key or a lock cylinder and retracted, wherein the movement is transferred to the latch of the pushrod lock via the pushrod, so that this latch is also retracted. It is disadvantageous in this connection that the pushrod is always also activated in the course of the insertion movement of the latch. This leads to stiff movements of the latch and malfunctions.
A mortise lock with a latch bolt is known from EP 431 369 A2. Besides the job of a conventional bolt, this latch bolt has the job of additionally locking the door, which is accomplished in that after closing the door the latch bolt changes automatically from a latch position into a lock position, in which it is extended away farther from the mortise lock than in the latch position and because of this extends deeply into the locking plate in the door frame. As a rule, such a latch bolt can no longer be pushed back by the insertion of a tool in the slit between the door and the door frame. A door with such a latch bolt is automatically locked after closing.
A locking device of the type mentioned at the outset is also known from DE 296 05 517 U1 wherein, however, there is the danger that in case of a warped door the spring-loaded latch bolt of the additional lock casing possibly no longer completely enters into the locking plate of the door panel frame and instead is jammed against the locking plate.
SUMMARY OF THE INVENTION
The present invention has as an object making available a locking device with additional lock casings by means of which the door offers improved resistance to break-ins and further, that the locking function is dependably performed.
In accordance with the present invention, this object is attained in that in connection with locking devices of the type mentioned at the outset, the latch restoring lever has a second catch, by means of which it is taken along in the other direction by the pushrod.
By means of the locking device in accordance with the present invention the advantage is attained, that the door can be held and also locked via the latch bolt outside of the center, i.e. at least in the area of a corner. In the course of locking a door equipped with the locking device in accordance with the present invention, first the latch bolt is pushed back via the locking plate on the side of the door frame, as a result of which closing of the door is made possible. Once the door is in the closed position, the latch bolt is pushed out of the additional lock casing and assumes a locking position past its latched position. In this position the latch bolt can no longer be pushed back, for example by the insertion of a flat tool into the gap between the door and the door frame. A door locked in this way offers great resistance to break-in. By means of the second catch it is assured that the latch bolt is inevitably extended with a downward movement of the pushrod, which is caused by locking the main lock by means of keys. If the latch bolt should become jammed against the locking plate of the door panel frame, this is either noted when actuating the key, so that the door can be correctly locked, or the jamming effect is overcome by the locking movement of the key and the latch bolt is locked shut.
In accordance with an exemplary embodiment it is provided that the second catch is formed by an element extending from the latch restoring lever. which is bent, at preferably a right angle from the latch restoring lever Such a component can be produced simply and at reasonable cost. Furthermore, existing latch restoring levers can be easily exchanged for the latch restoring lever of the present invention.
Another exemplary embodiment provides that the second catch comprises a welded-on element. The latch restoring levers in accordance with the present invention can also be produced at reasonable cost and simply.
In a variant in accordance with the present invention, the push-out stroke of the latch bolt is caused in that the main lock bolt has an extension, which acts on the pushrod during locking. The pushrod is displaced by the extension, so that the latch bolt is extended by means of the latch bolt restoring lever even against possible small resistance.
Further advantages, characteristics and details ensue from the claims as well as from the description which follows, wherein particularly preferred exemplary embodiments are represented in detail, making reference to the drawings. Here, the characteristics represented in the drawings and mentioned in the specification and the claims can be essential for the present invention respectively by themselves or in any arbitrary combination.
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patent: 1706486 (1929-03-01), Gasey
patent: 5495731 (1996-03-01), Riznik
patent: 5782114 (1998-07-01), Zeus et al.
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patent: 0798436A2 (1997-10-01), None
patent: 2540170 (1984-08-01), None
patent: 4862 (1823-11-01), None
Dieners Udo
Gründler Daniel
Gall Lloyd A.
Gretsch-Unitas GmbH Baubeschlage
Jones Tullar & Cooper P.C.
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