Electromechanical door lock

Abstract: An electromechanical door lock, comprising a lock body (1), which includes a dead bolt (5) movable between a protruding locking position and a withdrawn releasing position by electromechanical force transmission means, dead-locking means (6) for dead-locking the dead bolt and a manually operable force transmission means for moving the dead bolt and the dead-locking means manually for instance through key operation, includes coupling means (22; 23) having a first position, in which it is arranged to provide force transmission connection from both said manually operable force transmission means and said electromechanical force transmission means to the dead bolt (5). The coupling means (22; 23) is movable by means of said manually operable force transmission means into a second position, in which the force transmission connection from said electromechanical force transmission means to the dead bolt (5) is disconnected so that the dead bolt (5) is movable only through said manually operable force transmission means.

Description: This invention relates to an electromechanical door lock according to the preamble of claim 1. Electromechanical door locks of various kinds are known. Desirable properties of electromechanical door locks are inter alia a simplicity of construction, applicability for remote-controlled operation, a possibility for dead-locking the dead bolt, an ability to move the dead bolt manually (e.g. through key operation) especially for possible interruptions in electrical power supply as well as for operation of a defective lock. The importance of the two last-mentioned properties has increased according to the norms provided for the lock industry. The aim of the present invention is to create an improved electromechanical door lock, in which the desiderata set out above and especially the simplicity of the construction and secure operation of the lock in different operational situations are taken into account. A further aim is to provide an arrangement, which makes it possible to lock the dead bolt, when necessary, in whichever position thereof within the range of its movements, but so that the locking of the dead bolt can always be manually released for enabling its movement. Manual operation can refer for instance to a key operable lock mechanism, but any suitable manual means ( e.g. a turn knob) can be used depending on the level of security selected for access through the door in question, in normal use, and/or especially for emergency situations. The aims of the invention are achieved as described in the characterising part of claim 1. The basic idea of the invention is to provide the lock body with coupling means having a first position, in which it is arranged to provide force transmission connection from both manually operable force transmission means and electromechanical force transmission means to the dead bolt. In addition the coupling means is movable by means of said manually operable force transmission means into a second position, in which the force transmission connection from said electromechanical force transmission means to the dead bolt is disconnected so that the dead bolt is movable only through said manually operable force transmission means. The dead-locking means can with advantage be arranged to lock the dead bolt also in its withdrawn position in the lock body. A constructionally favourable solution is accomplished when the dead-locking means comprises a turnable dead-locking element supported to the lock body and spring-loaded towards its locking position. The manually operable force transmission means desirably includes a turnable force transmission piece, which through its turning movement is arranged to move the coupling means on one hand in the direction of the dead bolt and on the other hand substantially in the longitudinal direction of the lock body so that the movement takes place transversely with regard to the dead bolt. In order to accomplish the movements of the dead bolt the coupling means can be positioned in a guide groove in the dead bolt transverse to the direction of movement of the dead bolt. In practice the turnable force transmission piece can with advantage be formed eccentrically for accomplishing said movement of the coupling means substantially in the longitudinal direction of the lock body. In addition the force transmission piece suitably comprises a pin or the like, which is arranged to cooperate with a force transmission slot arranged in the coupling means for accomplishing the movements of the coupling means in the direction of the dead bolt and thus for accomplishing the back and forth movements of the dead bolt. Said pin or the like in the force transmission piece can be flexibly supported to the turnable force transmission piece so that it is movable into said force transmission slot in all the positions of the coupling means and the dead bolt. In this way manual movement of the dead bolt can be secured for different situations of defective operation and regardless of the position within the range of movement, in which the dead bolt has remained unmovable. Naturally, when necessary, it should be possible to remove the dead-locking means in a simple way into the position for releasing the dead bolt so as to make it possible to move the dead bolt. This can with advantage be accomplished so that the coupling means is arranged to release the dead bolt from the locking of the dead-locking means through their said movement substantially in the longitudinal direction of the lock body. The coupling means can with advantage be implemented so that it comprises a coupling body element, which is arranged to act on the dead-locking means, and a separate bifurcated element arranged to cooperate with it and with the electromechanical force transmission means so as to accomplish their force transmission connection with the dead bolt. Then said movement of the coupling means substantially in the longitudinal direction of the lock body can be arranged to move said bifurcated element substantially in the direction of the width of the lock body so that the force transmission connection from the electromechanical force transmission means to the dead bolt is disconnected. In practice said movement of the bifurcated element substantially in the direction of the width of the lock body can be accomplished by providing the bifurcated element and the coupling body element with wedge-like counter surfaces. In order to secure the electromechanical operation the bifurcated element is spring-loaded towards its position, in which the electromechanical force transmission means is connected to the dead bolt and from which it can be moved only by turning said manually operable force transmission piece. In accordance with a favourable embodiment of the invention said electromechanical force transmission means includes a force transmission wheel turnable by means of an electric motor and provided with a pin or the like, which is arranged to cooperate with said bifurcated element, and preferably with pin means for releasing the dead bolt from said dead-locking means. For providing automatic lock control, the lock body can include means, for instance a limit switch, for sensing the locking position of the dead-locking means and the position thereof releasing the dead bolt and in addition a Hall sensor for sensing the position of the dead bolt. In practice it is sufficient that the Hall sensor gives a signal when the dead bolt is in its extreme protruding position. In addition the lock body is desirably provided with a logic unit which receives the sensor information relating to the position of the dead bolt and of the dead-locking means and gives control commands for said electromechanical force transmission means in accordance with preprogrammed principles in a way known per se. One embodiment of door lock in accordance with the invention will now be described, by way of example, with reference to the accompanying drawings, in which: Figure 1 is a side view of the door lock with the cover partly opened and the dead bolt in a protruding position, Figure 2 shows a section on the line II-II of Figure 1, Figure 3 shows the lock with the dead bolt withdrawn, Figure 4 shows the lock with the dead bolt locked in an intermediate position, Figure 5 shows a section on the line V-V of Figure 4, Figure 6 shows the lock with the dead bolt moved into an intermediate position through manual operation, Figure 7 shows a section on the line VII-VII of Figure 6, Figures 8A and 8B show a coupling body element of the coupling means in the door lock, as a front view and a side view, and Figures 9A and 9B show a bifurcated element of the coupling means in the door lock as a side view and a front view. In the drawings the reference numeral 1 indicates a lock body, which is provided with a cover 2, a front plate 3 and an opening 4 for a dead bolt 5. The dead bolt 5 is movable between a protruding and a withdrawn position on the one hand by electromechanical force transmission means and on the other hand by a manually operable force transmission means. In addition the lock body includes a dead-locking element 6, which is turnably supported to the lock body by means of a pin 8 and which is urged by a spring 7 into the locking position of the dead bolt 5, i.e. in the counter-clockwise direction in Figure 1. The dead-locking element 6 includes a protrusion 9 with a stop face 10, which is arranged to cooperate with a stop face 11 of the dead bolt 5 for dead-locking the dead bolt in its protruding position. In addition the protrusion 9 includes a stop face 12, which is correspondingly arranged to cooperate with a stop face 13 of the dead bolt 5 for locking the dead bolt in its withdrawn position (cf. Figures 1 and 3). The electromechanical force transmission means includes an electric motor 14, which is arranged to turn a gear wheel 17 through a gear member 16 positioned on a shaft 15 drivably connected to the electric motor. The manually operable force transmission means for its part includes two turnable force transmission pieces 18 independent of one another having an opening 19, into which for instance a key operable force transmission element of a cylinder lock is connectable in a known way (not shown in the drawings). As there are two pieces 18, key operation can be accomplished from either side of the lock body as required. The perimeter of each force transmission piece 18 is formed as an eccentric guide surface 20 and in addition each piece 18 includes a pin 21, which is spring-loaded to move towards a central plane of the lock body (see Figure 2). The lock body includes also coupling means, by means of which the force transmission connection from both the electromechanical force transmission means and the manually operable force transmission means to the dead bolt 5 is accomplished. The coupling means includes a coupling body element 22 and a bifurcated element 23 arranged to cooperate therewith. These elements 22, 23 are positioned in a guide groove 42 in the dead bolt 5 so that locking and unlocking movements of the dead bolt 5 can be obtained by moving the coupling means in the longitudinal direction of the dead bolt. In Figure 1 the dead bolt 5 is shown in its extreme protruding position. The directions of movement of the parts, when the dead bolt is retracted into the lock body by means of the electromechanical force transmission means, are indicated in Figures 1, 3 and 6 by arrows. For electromechanical operation the electric motor 14 rotates the gear wheel 17 through the parts 15 and 16, whereby a pin 24 in the gear wheel 17 moves into a force transmission slot 25 in the bifurcated element 23 attempting to move the dead bolt 5 into the lock body 1. For making this movement possible, at the same time, a pin 26a in the gear wheel 17 presses the dead locking element 6 via a stop face 27 in the deadlocking element 6 into a position releasing the dead bolt (cf. Figure 1). In Figure 3 the dead bolt 5 is shown in its extreme withdrawn position, from which it is movable into its protruding position by operating the electric motor 14 in the opposite direction as compared with the situation shown in Figure 1. In this case, however, in order to release the dead bolt 5 from the locking accomplished by the stop face 12 in the dead-locking element 6, the gear wheel 17 is provided with a pin 26b, which bears against a stop face 28 on the dead-locking element 6 thereby turning it into a position where it releases the dead bolt 5 to be moved out from the lock body 1. Figures 4 and 5 disclose a situation, in which the dead bolt 5 remains in an intermediate position where it is protruding from the lock body less then in the extreme protruding position shown in Figure 1. In practice this can happen for instance when during the movement of the dead bolt 5 it hits against an obstacle blocking the movement into the extreme position. In case the obstacle is not overcome, the dead bolt can first be attempted to be moved in the opposite direction by means of the electric motor 14. If this does not work either, the dead bolt 5 remains locked in this position due to frictional forces within the electromechanical force transmission means, and thereby defective operation of the lock is prevented. From this position the dead bolt can now be moved by key operation, which is described in the following with reference to Figures 6 and 7. When one of the force transmission pieces 18 is turned by acting with a key from either side of the lock body 1 and the dead bolt 5 is in its extreme position either protruding or withdrawn, the pin 21 moves into a force transmission slot 29 in the coupling body element 22. When the turning movement of the force transmission piece 18 is continued this results in movement of the dead bolt 5 through the coupling means and the guide groove 42 in the dead bolt 5. Before the dead bolt 5 can be moved, however, it must be disconnected from the electromechanical force transmission means through the coupling means, and in addition, the dead bolt 5 must be released from the locking of the dead-locking element 6. As described above, the perimeter of each force transmission piece 18 is formed by the eccentric guide surface 20 and this surface is in engagement with a force transmission surface 30 provided in the coupling body element 22. Hence turning of a force transmission piece 18 simultaneously accomplishes movement of the coupling body element 22 transversely with regard to the dead bolt 5 downwards in the Figures. Then the wedge-like force transmission surfaces 31a and 31b arranged in the coupling body element 22 and the wedge-like force transmission surfaces 32a and 32b in the bifurcated element 23 corresponding thereto (see also Figures 8 and 9) move the bifurcated element 23 against the force of a spring 33, supported to a cover element 34 fixed on the dead bolt 5, towards the cover 2 of the lock body as shown in Figure 7. Support members 35 in the bifurcated element 23 prevent it from moving downwards in the Figures together with the coupling body element 22. As a result of this, the force transmission connection of the bifurcated element 23 to the pin 24 and thus to the force transmission wheel 17 is disconnected (cf. Figure 7) making it possible to move the dead bolt 5 through key operation independent of the electric force transmission means. Releasing of the dead bolt 5 from the locking of the dead-locking means 6 occurs at the same time as the coupling body element 22 moves, under the influence of the force transmission piece 18, downwards in the Figures. For this purpose the coupling body element 22 is provided with protrusions 36 and 37, which press the dead-locking element 6 through its protrusion 9 into the releasing position of the dead bolt shown in Figure 6. The protrusion 36 is used when the dead bolt is in its extreme protruding position and the protrusion 37 when the dead bolt is in its extreme withdrawn position, respectively. In case the dead bolt 5 is locked into some intermediate position for some reason or other, it can still be moved through key operation as described above. For this purpose the pins 21 are flexibly supported to the force transmission piece 18 so that when the pin 21 hits the coupling body element 22 it is pressed inside the force transmission piece 18. Thus, the pin 21 can always be moved into the force transmission slot 29 of the coupling body element 22 for accomplishing the movements of the dead bolt 5. For remote-controlled lock operation, the lock body can, with advantage, be provided with a Hall sensor 38, which with the assistance of magnetic means 39 located in the dead bolt senses the extreme protruding position of the dead bolt, and with a limit switch 40, which correspondingly senses whether the dead-locking means 6 is in the locking or in the releasing position of the dead bolt 5. This sensor information can be fed into a logic unit 41, which can be preprogrammed so as to control the electric force transmission means fur certain situations. For instance when the dead bolt meets an obstacle preventing movement of the dead bolt, whereby the dead bolt 5 may remain in an intermediate position as shown in Figures 4 and 5, the logic unit 41 can be arranged to control the electric force transmission means to move the dead bolt in the opposite direction. In case this does not release the obstruction and the dead bolt 5 is stuck, it can be moved through key operation as described above. The logic unit 41 can also be arranged to transmit the information about the positions of different members in each case to a remote control centre, from which it is possible to give control commands for the electric force transmission means and to conclude, if necessary, whether the situation presumes manual operation of the lock. The different parts of the lock shown can be formed in other ways. For instance the force transmission slot 25 of the bifurcated element 23 need not be a through-going slot but for instance only a guiding groove. In place of key operation other forms of manual operation can be provided. Thus the invention is by no means limited to the embodiment shown since several modifications are feasible within the scope of the following claims.

Claims: Electromechanical door lock, comprising a lock body (1), which includes a dead bolt (5) movable between a protruding locking position and a withdrawn releasing position by electromechanical force transmission means, dead-locking means (6) for dead-locking the dead bolt and manually operable force transmission means (18; 20) for moving the dead bolt and the dead-locking means manually for instance through key operation, characterised in that the lock body (1) includes coupling means (22; 23) having a first position, in which it is arranged to provide force transmission connection from both said manually operable force transmission means and said electromechanical force transmission means to the dead bolt (5), and in that said coupling means (22; 23) is movable by means of said manually operable force transmission means into a second position, in which the force transmission connection from said electromechanical force transmission means to the dead bolt (5) is disconnected so that the dead bolt (5) is movable only through said manually operable force transmission means. A door lock according to claim 1, characterised in that said dead-locking means (6) is arranged to lock the dead bolt (5) also in its withdrawn position in the lock body (1). A door lock according to claim 1 or 2, characterised in that said dead-locking means comprises a turnable dead-locking element (6) supported to the lock body and spring-loaded towards its locking position. A door lock according to any one of the preceding claims, characterised in that said manually operable force transmission means includes a turnable force transmission piece (18), which through its turning movement is arranged to move the coupling means (22; 23) on the one hand in the direction of the dead bolt (5) and on the other hand substantially in the longitudinal direction of the lock body (1) so that the movement takes place transversely with regard to the dead bolt (5). A door lock according to any one of the preceding claims, characterised in that the coupling means (22; 23) is positioned in a guide groove (42) in the dead bolt (5) transverse to the direction of movement of the dead bolt (5) for accomplishing the movements thereof. A door lock according to claim 4 or 5, characterised in that said turnable force transmission, piece (18) is provided with an eccentric guide edge (20) for accomplishing said movement of the coupling means (22; 23) substantially in the longitudinal direction of the lock body and is provided with a pin (21) or the like, which is arranged to cooperate with a force transmission slot (29) arranged in the coupling means (22; 23) for accomplishing the movements of the coupling means (22; 23) in the direction of the dead bolt (5) and thus for moving the dead bolt (5). A door lock according to claim 6, characterised in that said pin (21) or the like is flexibly supported to the turnable force transmission piece (18) so that it is movable into said force transmission slot (29) in all the positions of the coupling means (22; 23) and the dead bolt (5). A door lock according to any one of claims 4 to 7, characterised in that the coupling means (22; 23) is arranged to release the dead bolt (5) from the locking of the dead-locking means (6) through their said movement substantially in the longitudinal direction of the lock body (1). A door lock according to any one of claims 4 to 8, characterised in that said coupling means (22; 23) comprises a coupling body element (22), which is arranged to act on the dead-locking means (6), and a separate bifurcated element (23) arranged to cooperate with it and with the electromechanical force transmission means so as to accomplish their force transmission connection with the dead bolt (5), and in that said movement of the coupling means (22; 23) substantially in the longitudinal direction of the lock body is arranged to move said bifurcated element (23) substantially in the direction of the width of the lock body (1) so that the force transmission connection from the electromechanical force transmission means to the dead bolt (5) is disconnected. A door lock according to claim 9, characterised in that for accomplishing said movement of the bifurcated element (23) substantially in the direction of the width of the lock body (1) the bifurcated element (23) and the coupling body element (22) are provided with wedge-like counter surfaces (31a, 31b; 32a, 32b). A door lock according to claim 9 or 10, characterised in that the bifurcated element (23) is spring-loaded towards its position, in which the electromechanical force transmission means is connected to the dead bolt (5) and from which it can be moved only by turning said manually operable force transmission piece (18). A door lock according to any of claims 9, 10 or 11, characterised in that said electromechanical force transmission means included a force transmission wheel (17) turnable by means of an electric motor (14) and provided with a pin (24) or the like, which is arranged to cooperate with said bifurcated element (23) for moving the dead bolt (5), and preferably with pin means (26a, 26b) for releasing the dead bolt (5) from said dead-locking means (6). A door lock according to any one of the preceding claims, characterised in that the lock body (1) includes means, for instance a limit switch (40), for sensing the positions of the dead-locking means (6) both for dead-locking and releasing the dead bolt (5). A door lock according to any one of the preceding claims, characterised in that the lock body (1) is provided with means (38; 39), preferably based on the so-called Hall-effect, for sensing the position of the dead bolt (5). A door lock according to claim 14, characterised in that the lock body (1) is provided with a Hall sensor (38) arranged to give a signal when the dead bolt (5) is in its extreme protruding position. A door lock according to any one of the preceding claims, characterised in that the lock body (1) is provided with a logic unit (41) arranged to receive information relating to the position of the dead bolt (5) and of the dead-locking means (6) and to give control commands for said electromechanical force transmission means.

Inventors: ISSAKAINEN JORMA, JURVANEN MARKKU, MERILAEINEN JAAKKO, ISSAKAINEN, JORMA, JURVANEN, MARKKU, MERILAEINEN, JAAKKO, Meriläinen, Jaakko
Applicants: ABLOY SECURITY LTD OY, ABLOY SECURITY LTD. OY
Application year: 1991
Main classification: E05B47
IPC codes: E05B63, E05B47