Locks – Special application – For closures
Reexamination Certificate
1997-03-26
2002-05-21
Gall, Lloyd A. (Department: 3627)
Locks
Special application
For closures
C070S109000, C070S110000, C070S143000, C292S035000, C292S036000, C292S335000
Reexamination Certificate
active
06389855
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a locking device for a door, window or the like, having a main lock box, at least one supplementary lock box, and at least one drive rod connecting the supplementary lock boxes to the main lock box.
BACKGROUND OF THE INVENTION
From German Patent DE 35 05 379 C1, a drive rod lock has been disclosed that is connected via a drive rod to a middle lock. In other words, this drive rod connects the two latches of the two locks. In this way, a door can be connected to the edge plate in the door frame not only in the middle but also in the region of its corners. When the door is closed, the latches are pushed inward along the edge plate, so that the door can assume its closing position. For opening the door, the latch of the middle lock is actuated and retracted via a door handle or a lock cylinder; this motion is transmitted via the drive rod via the latch of the drive rod lock, thus retracting this latch as well. A disadvantage here is that when the latch is pushed inward, the drive rod is also always moved. This makes the latch sluggish and causes functional problems.
European Patent Disclosure EP 431 369 A2 discloses a mortise lock with a latch bolt. This latch bolt has the task, besides that of a conventional bolt, of additionally locking the door, which is accomplished in that the latch bolt after the door is closed changes over automatically from a latching position to a locking position, in which it is pushed farther out of the mortise lock than in the latching position and thus engages far inside the edge plate in the door frame. As a rule, such a latch bolt can no longer be retracted by inserting some tool into the slit between the door and the door frame. A door with this kind of latch bolt is automatically locked after being closed.
OBJECT AND SUMMARY OF THE INVENTION
An object of the present invention is to furnish a locking device with supplementary lock boxes with which the door offers better resistance to break-ins and moreover to improve the latch function.
According to the present invention, this object is attained in that in the locking device of the type referred to at the outset, the supplementary lock box has a latch bolt that can be retracted freely; the latch bolt is displaceable by a spring and/or by a gear past the normal latching position into its locking position.
With the locking device according to the present invention, the advantage is attained that the door can be held outside the middle, or in other words at least in the region of one corner, via the latch bolt and can also be locked thereby. If a door equipped with the locking device according to the present invention is swung shut, then first the latch bolt is retracted via the edge plate in the door frame, thus making it possible for the door to be closed. If the door is in the closed position, the latch bolt is pushed out of the supplementary lock box and moves past its latching position into a locking position. In that position, the latch bolt cannot be pushed back into the gap between the door and the door frame, for instance, by inserting some flat tool. A door locked in this way offers high resistance to break-ins.
It is especially worth noting that the latch bolt, when the door is open, is held in the latching position by a blocking element, so that the door can easily be closed. Not until the door assumes its closed position does the blocking element release the latch bolt, so that the latch bolt can move past the latching position further by approximately 10 mm to 15 mm out of the supplementary lock box and can engage the edge plate in the door frame. The release of the latch bolt by the blocking element takes place automatically whenever the door assumes its closing position, since then the blocking element is forced by the edge plate in the door frame into the release position. In other words, the automatic movement outward of the latch bolt is tripped by the edge plate.
In a further feature it is provided that the blocking element is supported pivotably in the latch bolt in a normal plane to the pivot axis of the door. In other words, the blocking element has a pivot axis parallel to the pivot axis of the door, so that when it meets the edge plate it can deflect. In the position of repose, the blocking element protrudes part way past the contour of the latch bolt.
Preferably, the blocking element is forced in the projection direction via a spring-loaded lever. From this projection direction, in which the blocking element protrudes beyond the contour of the latch bolt, the blocking element can be pushed counter to the force of the spring-loaded lever into a position inside the contour of the latch bolt and is thereby rendered inoperative.
In one exemplary embodiment it is accordingly provided that via the blocking element, the latch bolt is forced into the latching and locking position. The spring-loaded lever that forces the blocking element in the projection direction also brings about the projection of the latch bolt into its latching position when the door is open and into its locking position when the door is closed.
The latch bolt, on its side opposite the contact incline and in the region of the latch tail, preferably has a protrusion which is engaged by a latch restoring lever. Via this latch restoring lever, the latch bolt is retracted either out of its locking position or out of its latching position, to allow the door to be opened. The latch restoring lever is connected to the drive rod in such a way that on actuation of the drive rod it is carried along by the drive rod into the reverse closing position. On being shifted into this reverse closing position, the latch restoring lever pulls the latch bolt all the way into the supplementary lock box. Via the drive rod, a plurality of supplementary lock boxes can be connected to the main lock box, so that the individual latch bolts of the supplementary lock boxes are thrust synchronously into the respective lock boxes via the drive rod. The use of a plurality of lock boxes over the height of the door also prevents warping of the door and further reduces the danger of break-ins.
Preferably, on closure of the door and pushing in of the latch bolt, the latch restoring lever is pivoted by the latch bolt and decoupled from the drive rod. Accordingly, on closing of the door only the latch bolt is thrust inward but the drive rod is not actuated.
Preferably, the latch restoring lever is pivotable about an axis at right angles to the door leaf. In this way, the latch restoring lever converts the shear force, which on displacement of the drive rod extends in a direction parallel to the pivot axis of the door, into a shear force that is orthogonal to it and is located at the plane of the door leaf, and with this latter shear force the latch bolt can be retracted into the supplementary lock box.
In accordance with a preferred exemplary embodiment, the latch bolt is engaged by a latch blocking lever, which when the latch bolt has been pushed all the way out locks the latch bolt in the locking position. This latch blocking lever prevents the latch bolt, located in the locking position, from being retractable into the supplementary lock box, for instance via a tool inserted between the door and the door frame, even if the door frame is damaged, exposing the latch bolt.
A further feature provides that the latch blocking lever in the locking position engages the latch bolt, or a protrusion of the latch bolt from behind with a latch blocking edge. As soon as the latch bolt assumes its locking position, the latch blocking lever is shifted in such a way that its latch blocking edge secures the latch bolt in the locking position. Displacement of the latch bolt can occur only whenever the engagement from behind of the latch blocking edge of the latch blocking lever is undone.
An especially preferred exemplary embodiment contemplates that the latch restoring lever has a pawl, which upon actuation of the latch restoring lever by means of the drive rod lifts the latch blocking lever out of its positio
Henzler Thomas
Renz Walter
Röger Wolfgang
Gall Lloyd A.
Gretsch-Unitas GmbH Baubeschlage
Jones Tullar & Cooper P.C.
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