DOOR LOCK WITH A HOOK BOLT

Description

[0001] The invention relates to a door lock provided with a hook bolt in accordance with the preamble of claim 1.

[0002] The Finnish patent 104199 discloses a door lock of the kind meant above, in which a separate hook part of a hook bolt is turnably journalled to a guide part movable in the lock case. An aim of the invention is to further develop lock arrangements for a door or other turnable wings provided with a hook bolt so that the possibilities for installation of this kind of locks would be more extensive and their burglary preventing properties would further be improved. A further aim of the invention is that the lock would be secure as to the operation and advantageous as to its costs.

[0003] The aims of the invention can be met as is more closely disclosed in claim 1 and in the other claims. According to the invention the hook bolt comprises a pivot arrangement by means of which the hook part is movable with regard to the guiding part in the longitudinal direction of the front plate. In addition the lock case includes a guiding groove for guiding the pivoting point of the hook part both in the longitudinal direction of the front plate and in the direction of movement of the guiding part. This makes it possible to move the hook part inside the striking plate so that the hook part can turn into its locking position in a smaller space than before. Hereby it is possible to essentially reduce the requirement for space in the direction of the movement of the guiding part and the protruding length of the bolt, whereby possibilities for installation of the lock in different locations can correspondingly be increased.

[0004] In practice the pivot arrangement of the hook part is accomplished by means of a pivot pin, which is movably supported to a guiding groove arranged in the guiding part and extending mainly in the longitudinal direction of the front plate.

[0005] The shape of the guiding groove in the lock case is with advantage selected so that in the first phase of the movement of the hook bolt out into the protruding position the pivoting point of the hook part is moved at the same time downwards with regard to the front plate. When the hook part is moved out from the opening for the bolt in the front plate, the guiding groove extends substantially only in the direction of the movement of the guiding part.

[0006] In order to secure the turning movement of the hook part into the locking position the lock case includes a guiding surface which, after the hook part is moved through the opening for the bolt in the striking plate, is arranged to guide the hook part so that it is turned with regard to its pivoting point inside the striking plate into its locking position.

[0007] In order to improve burglar-proof properties of the lock and especially to prepare for a situation where one tries to lift the entire door provided with the lock away from its hinges by making use of the hook bolt, at the front plate side end of the guiding groove in the lock case at the position corresponding to the locking position of the hook part there is an extension part in the guiding groove extending upwards in the longitudinal direction of the front plate and separated from the guiding groove by means of a connection piece. This connection piece is with advantage fixed to the lock case through shallow parts, which can be broken with said pivot pin. Correspondingly the upper surface of the hook part includes a recess which is arranged in cooperation with the upper edge of the opening for the bolt in the front plate to prevent moving of the hook bolt inside the lock case after said connection piece is broken by means of said pivot pin. As a consequence of these measures the hook bolt remains fully jammed as a result of an attempted burglary and thus the attempted burglary utilizing said technique is effectively stopped.

[0008] In order to secure the preventing measures mentioned above the hook part is additionally so dimensioned that in its fully protruding locking position it fills the major part of the opening of the striking plate in the longitudinal direction of the front plate. For its part this prevents already as such moving of the door out from its hinges.

[0009] The construction of the bolt can be kept simple and secure as to its operation when the guiding part of the hook bolt is continuously located inside the lock case.

[0010] In the following the invention is described as a way of example with reference to the attached drawing, in which

• Fig. 1 shows a side view of a known door lock arrangement installed in a door and the lock case opened,
• Figs. 2-9 show an embodiment of a door lock according to the invention in different operating positions of the hook bolt.

[0011] The known door lock shown in figure 1 comprises a lock case 1, which is provided with a front plate 3, by means of which it is fixed to a door 2 or the like. The lock includes a hook bolt 4, which comprises a guiding part 5, which is linearly movable inside the lock case and to which a hook part 6 of the hook bolt is turnably journalled by means of a pivot pin 7. The lock case comprises also a guiding groove 8, which guides the pin 7 and thus the movements of the hook bolt. The hook bolt 4 is moved directly by means of a key 9 of the lock. In addition the lock includes a set of spring-loaded locking discs 10 movable with the key 9 of the lock and including a locking channel 11 for a lock pin 12 fixed to the guiding part 5 of the hook bolt. The operation of the lock as such is quite conventional and is described for instance in said Finnish patent 104199, so it is not here described in more detail. Figure 1 shows also a striking plate 14 for the lock fixed to a door frame 13 or the like and including a housing 15 for the bolt. In figure 1 the hook bolt 4 is in its protruding locking position, in which the hook part 6 has entered through an opening 3a for the bolt in the front plate and through an opening 14a for the bolt in the striking plate into the housing 15 so that the hook part 6 extends some length parallel with an inner surface 14b in the striking plate.

[0012] The arrangement according to the invention illustrated in figures 2-9 differs from the known arrangement of figure 1 in the first place so that in accordance with the invention when the hook bolt is moved from the withdrawn position into its protruding locking position the hook part 6 of the hook bolt is arranged to move in successive order in opposite turning directions relative to the guiding part 5 at the same time as the pivoting point of the hook part is moved in the direction of the front plate. Hereby the space required for the turning of the hook part of the hook bolt can be reduced and the protruding length of the bolt can be essentially shortened without compromising the security of locking and operation of the arrangement.

[0013] In practice this is accomplished so that also in this case the hook part 6 of the hook bolt is turnably journalled to the guiding part 5 by means of the pivot pin 7, but the pivot pin 7 can move in a guiding groove 5a arranged in the guiding part and extending in the longitudinal direction of the front plate 3. In addition the guiding groove 8 in the lock case includes two branches 8a and 8b extending in different directions. The first branch 8a is transverse with both the direction of movement of the guiding part 5 of the hook bolt and the front plate 3. As a consequence of this when the hook bolt is moved outwards from the lock case the hook part 6 is at the same time turned somewhat in clockwise direction relative to the guiding part 5 (figure 3). The second branch 8b extends in the direction of the movement of the guiding part 5, so when the hook bolt is moved further the hook part 6 moves at the same time through both the opening 3a for the bolt in the front plate and the opening 14a for the bolt in the striking plate (the latter is not shown; figure 4). Now the hook part 6 can turn by means of the pivot pin 7 in counterclockwise direction with regard to the guiding part 5 into its locking position, which occurs partly due to gravity and partly due to guiding surfaces 6b in the hook part and 17 in the lock case respectively (figures 5 and 6).

[0014] In accordance with the invention the guiding groove 8 in the lock case includes further an extension part 8c, which extends upwards in the direction of the front plate 3 and which is normally separated from the branch 8b by means of a connection piece 16, which is fixed to the lock case through shallow parts 16a. The shallow parts 16a are so dimensioned that if a lifting force acts on the lower edge of the hook part 6 for instance in the pursuit to lift the door out from its hinges, the pivot pin 7 of the hook part 6 breaks the shallow parts 16a at the same time as the pin 7 is moved on one hand along the guiding groove 5a in the guiding part and on the other hand along the extension part 8c of the guiding groove in the lock case upwards in the figures. This is illustrated in figures 7 and 8.

[0015] Moving of the door out from its hinges as such will fail since the hook part 6 is dimensioned with regard to the opening 14a for the bolt in the striking plate so that the construction does not allow an upward movement long enough. As a consequence of this movement, however, the entire hook bolt is jammed due to a recess 6a made in the hook part 6 and being in cooperation with the upper edge of the opening 3a for the bolt in the front plate. A bevel surface in the recess 6a together with the pivot pin 7, the broken connection piece 16 and the guiding grooves 5a and 8c act in a wedge-like manner on the hook part 6 preventing hereby effectively any further measures for this part (figure 9). Hereby damaging of other inner members of the lock by means of the bolt can also be prevented, whereby the requirements for strength for their part can correspondingly be kept lower and thus the manufacturing costs for the lock case itself can be kept lower as well.

[0016] It is to be noted that the hook bolt arrangement according to the invention can be applied in different lock cases independent on whether the movements of the bolt are carried out directly through a key, a key operated locking mechanism or for instance through an electric or electromagnetic arrangement. In addition to doors the lock can naturally be installed also to corresponding lockable locations such as hatches, turnable wings etc. Thus, the invention is not limited to the embodiment shown but several modifications are feasible within the scope of the attached claims.

Claims

1. A door lock, comprising a housing-like lock case (1) provided with a front plate (3) and including a hook bolt (4;5,6), which is movable between a locking and a releasing position by means of a key (9) of the lock or other force transmission element and comprises a guiding part (5) linearly movable inside the lock case (1) and a separate hook part (6) turnably journalled on the end of the guiding part (5) and which is arranged in cooperation with a striking plate (14) in a door frame (13) so that in its locking position the hook part (6) of the hook bolt (4;5,6) is moved through an opening (14a) in the striking plate and is turned towards an inner surface (14b) in the striking plate, characterized in that the hook bolt (4;5,6) comprises a pivot arrangement by means of which the hook part (6) is movable with regard to the guiding part (5) in the longitudinal direction of the front plate (3), and in that the lock case (1) includes a guiding groove (8;8a,8b) for guiding the pivoting point of the hook part (6) both in the longitudinal direction of the front plate (3) and in the direction of movement of the guiding part (5).

2. A door lock according to claim 1, characterized in that the pivot arrangement of the hook part (6) is accomplished by means of a pivot pin (7), which is movably supported to a guiding groove (5a) arranged in the guiding part (5) and extending mainly in the longitudinal direction of the front plate (3).

3. A door lock according to claim 1 or 2, characterized in that the shape of the guiding groove (8;8a,8b) in the lock case is selected so that in the first phase of the movement of the hook bolt (4) out into the protruding position the pivoting point (7) of the hook part (6) is moved at the same time downwards with regard to the front plate (3).

4. A door lock according to any one of the preceding claims, characterized in that the shape of the guiding groove (8;8a,8b) in the lock case is selected so that when the hook part (6) is moved out from an opening (3a) for the bolt in the front plate the guiding groove (8;8a,8b) extends substantially only in the direction of the movement of the guiding part (5).

5. A door lock according to any one of the preceding claims, characterized in that the lock case includes a guiding surface (17) which, after the hook part (6) is moved through the opening (14a) for the bolt in the striking plate, is arranged to guide the hook part (6,6b) so that it is turned with regard to its pivoting point (7) inside the striking plate (14) into its locking position.

6. A door lock according to any one of the preceding claims, characterized in that at the front plate (3) side end of the guiding groove (8;8a,8b) in the lock case at the position corresponding to the locking position of the hook part (6) there is an extension part (8c) in the guiding groove extending upwards in the longitudinal direction of the front plate (3) and separated from the guiding groove (8;8a,8b) by means of a connection piece (16), and in that said connection piece (16) is fixed to the lock case (1) through shallow parts (16a) which can be broken with said pivot pin (7).

7. A door lock according to claim 6, characterized in that the upper surface of the hook part (6) includes a recess (6a) which is arranged in cooperation with the upper edge of the opening (3a) for the bolt in the front plate to prevent moving of the hook bolt (4) inside the lock case after said connection piece (16) is broken by means of said pivot pin (7).

8. A door lock according to any one of the preceding claims, characterized in that the hook part (6) is so dimensioned that in its fully protruding locking position it fills the major part of the opening (14a) of the striking plate in the longitudinal direction of the front plate (3) preventing thereby moving of the door out from its hinges.

9. A door lock according to any one of the preceding claims, characterized in that the guiding part (5) of the hook bolt is continuously located inside of the lock case (1).

Ansprüche

1. Türschloß, das einen mit einer Frontplatte (3) versehenen gehäuseähnlichen Schloßkasten (1) umfaßt und einen Hakenbolzen (4; 5, 6) beinhaltet, der zwischen einer Verriegelungs- und einer Freigabeposition mittels eines Schlüssels (9) des Schlosses oder eines anderen Kraftübertragungselements bewegbar ist und ein innerhalb des Schloßkastens (1) linear bewegbares Führungsteil (5) sowie ein am Ende des Führungsteils (5) drehbar gelagertes separates Hakenteil (6) umfaßt, das zum Zusammenwirken mit einem Schließblech (14) in einem Türrahmen (13) vorgesehen ist, so daß in seiner Verriegelungsposition das Hakenteil (6) des Hakenbolzens (4; 5, 6) durch eine Öffnung (14a) im Schließblech bewegt und hin zu einer inneren Oberfläche (14b) im Schließblech gedreht wird, dadurch gekennzeichnet, daß der Hakenbolzen (4; 5, 6) eine Schwenkanordnung umfaßt, mittels derer das Hakenteil (6) im Verhältnis zum Führungsteil (5) in der Längsrichtung der Frontplatte (3) bewegbar ist, und daß der Schloßkasten (1) eine Führungsnut (8; 8a, 8b) beinhaltet, um den Schwenkpunkt des Hakenteils (6) sowohl in der Längsrichtung der Frontplatte (3) als auch in der Bewegungsrichtung des Führungsteils (5) zu führen.

2. Türschloß nach Anspruch 1, dadurch gekennzeichnet, daß die Schwenkanordnung des Hakenteils (6) mittels eines Schwenkstifts (7) verwirklicht wird, der sich gegenüber einer Führungsnut (5a), die im Führungsteil (5) vorgesehen ist und sich überwiegend in der Längsrichtung der Frontplatte (3) erstreckt, bewegbar abstützt.

3. Türschloß nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Form der Führungsnut (8; 8a, 8b) im Schloßkasten so gewählt ist, daß der Schwenkpunkt (7) des Hakenteils (6) in der ersten Phase der nach außen erfolgenden Bewegung des Hakenbolzens (4) in die herausragende Position hinein gleichzeitig im Verhältnis zur Frontplatte (3) nach unten bewegt wird.

4. Türschloß nach einem der vorstehend aufgeführten Ansprüche, dadurch gekennzeichnet, daß die Form der Führungsnut (8; 8a, 8b) im Schloßkasten so gewählt ist, daß sich die Führungsnut (8; 8a, 8b), wenn das Hakenteil (6) aus einer Öffnung (3a) für den Bolzen in der Frontplatte herausbewegt wird, im wesentlichen nur in der Richtung der Bewegung des Führungsteils (5) erstreckt.

5. Türschloß nach einem der vorstehend aufgeführten Ansprüche, dadurch gekennzeichnet, daß der Schloßkasten eine Führungsoberfläche (17) beinhaltet, die, nachdem das Hakenteil (6) durch die Öffnung (14a) für den Bolzen im Schließblech bewegt wurde, so vorgesehen ist, daß sie das Hakenteil (6, 6b) so führt, daß es im Verhältnis zu seinem Schwenkpunkt (7) im Inneren des Schließblechs (14) in seine Verriegelungsposition gedreht wird.

6. Türschloß nach einem der vorstehend aufgeführten Ansprüche, dadurch gekennzeichnet, daß sich am seitlichen Frontplattenende (3) der Führungsnut (8; 8a, 8b) im Schloßkasten an der der Verriegelungsposition des Hakenteils (6) entsprechenden Position ein Verlängerungsteil (8c) in der Führungsnut befindet, das sich nach oben in der Längsrichtung der Frontplatte (3) erstreckt und von der Führungsnut (8; 8a, 8b) mittels eines Verbindungsstücks (16) getrennt ist, und daß das Verbindungsstück (16) durch flache Teile (16a), die mit dem Schwenkstift (7) zerbrochen werden können, am Schloßkasten (1) fixiert ist.

7. Türschloß nach Anspruch 6, dadurch gekennzeichnet, daß die obere Oberfläche des Hakenteils (6) einen Rücksprung (6a) beinhaltet, der zum Zusammenwirken mit der oberen Kante der Öffnung (3a) für den Bolzen in der Frontplatte vorgesehen ist; um eine Bewegung des Hakenbolzens (4) im Inneren des Schlößkastens zu verhindern, nachdem das Verbindungsstück (16) mittels des Schwenkstifts (7) zerbrochen wurde.

8. Türschloß nach einem der vorstehend aufgeführten Ansprüche, dadurch gekennzeichnet, daß das Hakenteil (6) so dimensioniert ist, daß es in seiner vollständig herausragenden Verriegelungsposition den Hauptteil der Öffnung (14a) des Schließblechs in der Längsrichtung der Frontplatte (3) ausfüllt, wodurch verhindert wird, daß sich die Tür aus ihren Scharnieren herausbewegt.

9. Türschloß nach einem der vorstehend aufgeführten Ansprüche, dadurch gekennzeichnet, daß sich das Führungsteil (5) des Hakenbolzens ständig im Inneren des Schloßkastens (1) befindet.

Revendications

1. Serrure de porte, comprenant une case de serrure semblable à un logement (1) pourvue d'une plaque avant (3) et comprenant un pêne en crochet (4 ; 5, 6), qui peut se déplacer entre une position de verrouillage et une position de déverrouillage au moyen d'une clé (9) de serrure ou d'un autre élément de transmission d'une force et qui comprend une partie de guidage (5) pouvant se déplacer linéairement dans la case de serrure (1) et une partie crochet séparée (6) montée sur palier tournant à l'extrémité de la partie de guidage (5) et qui est agencée en coopération avec une gâche (14) située dans un encadrement de porte (13) de telle manière que dans sa position de verrouillage la partie crochet (6) du pêne en crochet (4 ; 5, 6) est déplacée à travers une ouverture (14a) dans la gâche et est tournée vers une surface intérieure (14b) dans la gâche, caractérisée en ce que le pêne en crochet (4 ; 5, 6) comprend un agencement de pivot au moyen duquel la partie crochet (6) peut se déplacer par rapport à la partie de guidage (5) dans la direction longitudinale de la plaque avant (3), et en ce que la case de serrure (1) comprend une gorge de guidage (8 ; 8a, 8b) pour guider le point de pivotement de la partie crochet (6) à la fois dans la direction longitudinale de la plaque avant (3) et dans la direction de mouvement de la partie de guidage (5).

2. Serrure de porte selon la revendication 1, caractérisée en ce que l'agencement de pivot de la partie crochet (6) est réalisé au moyen d'un axe de pivot (7), qui est supporté de façon mobile dans une gorge de guidage (5a) agencée dans la partie de guidage (5) et qui s'étend principalement dans la direction longitudinale de la plaque avant (3).

3. Serrure de porte selon la revendication 1 ou 2, caractérisée en ce que la forme de la gorge de guidage (8 ; 8a, 8b) dans la case de serrure est sélectionnée de telle façon que dans la première phase du mouvement du pêne en crochet (4) sortant en position de saillie, le point de pivot (7) de la partie crochet (6) est déplacé en même temps vers le bas par rapport à la plaque avant (3).

4. Serrure de porte selon l'une quelconque des revendications précédentes, caractérisée en ce que la forme de la gorge de guidage (8 ; 8a, 8b) dans la case de serrure est sélectionnée de telle façon que, quand la partie crochet (6) est déplacée hors d'une ouverture (3a) du pêne dans la plaque avant, la gorge de guidage (8 ; 8a, 8b) s'étend substantiellement et seulement dans la direction du mouvement de la partie de guidage (5).

5. Serrure de porte selon l'une quelconque des revendications précédentes, caractérisée en ce que la case de serrure comprend une surface de guidage (17) qui, après que la partie crochet (6) a été déplacée dans l'ouverture (14a) du pêne dans la gâche, est agencée pour guider la partie crochet (6, 6b) de telle façon qu'elle tourne par rapport à son point de pivot (7) à l'intérieur de la gâche (14) dans sa position de verrouillage.

6. Serrure de porte selon l'une quelconque des revendications précédentes, caractérisée en ce qu'à l'extrémité du côté plaque avant (3) de la gorge de guidage (8 ; 8a, 8b) dans la case de serrure à la position correspondant à la position de verrouillage de la partie crochet (6) se trouve une partie de prolongement (8c) dans la gorge de guidage s'étendant vers le haut dans la direction longitudinale de la plaque avant (3) et séparée de la gorge de guidage (8 ; 8a, 8b) au moyen d'une pièce de connexion (16), et en ce que ladite pièce de connexion (16) est fixée à la case de serrure (1) à travers des parties à faible profondeur (16a) qui peuvent être cassées avec ledit axe de pivot (7).

7. Serrure de porte selon la revendication 6, caractérisée en ce la surface supérieure de la partie crochet (6) comprend une découpe (6a) qui est agencée en coopération avec le bord supérieur de l'ouverture (3a) du pêne dans la plaque avant pour prévenir le mouvement du pêne en crochet (4) à l'intérieur de la case de serrure après que ladite pièce de connexion (16) a été cassée au moyen dudit axe de pivot (7).

8. Serrure de porte selon l'une quelconque des revendications précédentes, caractérisée en ce que la partie crochet (6) est dimensionnée de telle façon que dans sa position de verrouillage entièrement sortie, elle occupe la majeure partie de l'ouverture (14a) de la gâche dans la direction longitudinale de la plaque avant (3) empêchant de la sorte de dégonder la porte.

9. Serrure de porte selon l'une quelconque des revendications précédentes, caractérisée en ce que la partie de guidage (5) du pêne en crochet est continuellement logée à l'intérieur de la case de serrure (1).

Drawing