Electromechanical door lock

ELECTROMECHANICAL DOOR LOCK - ELECTROMECHANICAL DÖRRLÄS

The invention relates to an electromechanical door lock according to the preamble of claim 1.

One problem with electromechanical motor-operated door locks, which can also be easily arranged for remote control, is to guide and center the locking axle in the opening of the counter plate in the door frame. For this purpose, the lock body is further provided with a spring-loaded latch projecting from the lock body. The problem in this case is the frictional forces caused by the lateral loading of the bogie and the latch, which make it difficult to move these members from their protruding position from the opening of the lock counter plate inside the lock body. On the other hand, the aim is to provide a lock body that meets the standards set for the dimensions of a door lock, for example the relevant standards of the German DIN standard. Thus, in practice, it is difficult to accommodate a sufficiently powerful electric motor in the lock body which would be able to pull both the bogie and the latch simultaneously into the lock body. The suitability of the lock body for remote control is poor if the latch has to be operated with separate manual actuators.

One solution to the above problem is presented in Finnish Patent Application No. 880953, according to which the lock bar and latch are partially retracted into the lock body at different times, so that a different transmission ratio is used in the transmission mechanism between the electric motor and said lock parts. The solution is Complicated and causes eg that the axle has two different retracted positions.

The object of the invention is to eliminate the shortcomings of the prior art and to solve said problem in a new way. The object of the invention is at the same time to provide a lock body with an electrically retractable axle, which is preferably suitable for remote control and has a simple and reliable structure and is also a compact unit.

The objects of the invention are achieved as defined in the characterizing part of claim 1. In a new and advantageous way, an articulated latch structure known per se has been used to solve the above-mentioned problems, the more detailed structure and operating principle of which is referred to in Finnish Patent Application No. 871,601. By ap plying said latch structure in accordance with the invention to the electrically operated lock body which is the subject of the invention, a lock body provided with a latch centering the lattice is provided, in which no separate operating devices are required in the lock body for retracting the latch. Namely, when the bar is first retracted into the lock body and the door is opened or closed by pushing so that the latch presses against the lock counter plate, the counter plate at the same time presses the latch into the lock body just like a conventional inclined axis. However, the difference is that when the oblique tent can be pushed into the lock body only when the door is closed, the bogie structure applied in the invention can also be pushed into the lock body in this way also when the door is opened.

A prerequisite for the operation of the latch described above is, of course, that the rear lock of the latch has first been removed. This can advantageously be achieved mainly by a transmission unit which is displaceable in the longitudinal direction of the lock body, which is at the same time arranged to also remove the rear locking of the bogie. This simplifies the structure of the lock body.

In its second extreme position, said transmission unit can advantageously itself act as a time-retaining means for the rear locking of the bogie. In this case, the transfer of the transmission unit from the rear locking position of the bogie to its other extreme position can at the same time advantageously be arranged to cause the bogie to be retracted into the lock body.

It is advantageous to provide for the removal of the rear locking of the latch to be achieved only at the end of the retraction of the bogie lock body, in which case the bogie is preferably already completely displaced from the opening of the chest plate. In this way, frictional forces due to the lateral loading of the bogie can be advantageously eliminated.

In the event of a power failure and for panic operation, the lock body is preferably also provided with operating shafts for key operation and push-button or knob operation, so that these means are also arranged to act on said transmission unit to move it to the bogie-releasing position.

An advantageous solution, both in terms of space utilization and manufacturing technology, is obtained if the transmission unit comprises one functionally integrated, plate-like body. Depending on the requirements for the dimensions of the lock body, the transmission unit can in practice be only one piece, but it can also be made of several parts, if necessary, which are nevertheless connected to each other so that they form one functional unit.

The invention will now be described in more detail with reference to the accompanying drawing, in which Figure 1 shows a side view of a lock body according to the invention and in which the lock bar and latch are in the locked position, Figure 2 shows the lock of Figure 1 with the lock bar and latch in the door open position.

In the drawing, reference numeral 1 denotes a lock body comprising a breast plate 2. The lock body has a straight axis 3 which is pressed by the spring 5 into the protruding locking position, and a latch 4 which is pressed out of the lock body by the spring 6. The latch 4 comprises a body part 4c movable inside the lock body, into which the tip part projecting from the lock body is articulated to rotate about the longitudinal axis of the lock body. In the embodiment of the figures, the tip part of the latch comprises two separate wedge-shaped outwardly tapering pieces 4a and 4b, but equally well the tip part could consist of only one wedge-shaped tip part articulated to the body part 4c, as disclosed in the above-mentioned Finnish patent application number 871601.

The lock body also has an electric motor 7, which is arranged by means of transmission elements 8, 9 and 10 to act on the arm 12 of the transmission body 11 to be moved longitudinally of the lock body. The transmission body 11 also has a guide groove 14 cooperating with the bogie 3 guide pin 13 The guide groove 14 is shaped in such a way that, in the extreme position of Fig. 1, it at the same time locks back to the protruding position of the bogie 3 by means of the guide pin 13 (cf. Fig. 1).

The lock body is also provided with a rear locking member 15 of the latch 4 and a spring 16 which tends to press the rear locking member 15 into its rear locking position against the abutment surface 17 of the latch body 4c.

The lock body is further provided with an auxiliary shaft 19, which is pressed outwards from the lock body by a spring 20. In the position of Figure 1, the auxiliary tent 19 is pressed against a counter plate 18 located in the door frame or the like. The auxiliary bogie 19 is provided with a mating surface 21 which, in the retracted position of the bogie 3, cooperates with the stop 22 of the transmission 11, thus preventing the transmission 11 from moving downwards in Fig. 2 and the bogie moving into its protruding locking position.

In the situation shown in Figure 1, the bar 3 and the latch 4 are locked to the rear in their protruding locking position, whereby the door is locked. When the electric motor 7 has moved the transmission piece 11 to its position shown in Fig. 2 by means of the transmission means 8, 9 and 10, the groove 14 of the transmission piece has moved the bogie 3 to its retracted position by means of the guide pin 13. At the same time, the guide surface 31 of the transmission piece 11 has moved the rear locking member 15 of the latch 4 to the rear locking release position. In this case, the door can be opened by pushing, because when the tip part of the latch 4 presses against the edge of the opening of the counter plate, the tip part at the same time slightly rotates around its articulated shaft a nd presses against the force of the spring 6 inside the lock body. More specifically, only the part 4a rotates in this case, since the part 4b is already in a position where it can be pressed inside the lock body like a Diagonal roller.

When the door is pushed past the counter plate 18, the situation is as shown in Figure 2. In this case, the spring 6 pushes the latch 4 again to its position protruding from the lock body, and at the same time the tip part 4a rotates back to its original position due to its stop 35 and the spring 6. Likewise, the auxiliary bogie 19 moves to its protruding position when pressed by the spring 20, so that the abutment 21 of the auxiliary bogie 19 is located below the abutment 22 of the transmission 11, thus preventing the transmission 11 from moving downwards and thus moving the bogie 3 out of the lock body.

The motor 7 can be programmed in a continent known per se after a certain delay to move the transmission elements 8, 9 and 10 back to the position shown in Fig. 1. When the door is then pushed closed, the latch 4 and the auxiliary bar 19 hit the edge of the counter plate 18, which presses them both into the inserted position. More specifically, in this case, only the tip part 4b rotates, because correspondingly the part 4a is already in the already compliant position. In this case, the abutment 21 of the auxiliary bogie 19 moves away from the abutment 22 of the transmission body 11, thus releasing the transmission member 11 to move

3 8 02 back to the position of Figure 1. As soon as the latch 4 is at the counter-opening in the counter plate, the spring 6 pushes the latch 4 out of the lock body and the bar 3, when pressed by the spring 5, moves to its protruding position into its own opening in the counter plate 18. In its extended position, the latch 4 at the same time centers the position of the door relative to the counter plate 18. As shown in the figure

I show that the auxiliary bar 19 presses against the counter plate 18, because the counter plate does not have its own opening for the auxiliary bar 19.

In the event of electrical disturbances, electric motor failure or panic functions, the lock body is provided with operating shafts 23 and 27. The operating shaft 23 can be mounted on the inside of the door with a push-knob 24 rotatable against the force of a spring 26 by means of a button, knob or the like. in the figures upwards to the opening position of the bogie 3. In this case, the door can always be opened by pushing from the inside. Especially in the case where the actuator is a button, the spring 26 ensures that the button remains horizontal.

Correspondingly, key-operated actuators, for example a cylinder lock, can be mounted on the operating shaft 27, by means of which the transmission member 11 can act on the stop 32 of the transmission piece 11 to move the bogie 3 to its release position inserted inside the lock body.

The lock body is also provided with microswitches 28 and 29 arranged to co-operate with the transmission

II with control pins 33 and 34. Since the movement movements of the transmission piece 11 also determine the position of the bogie 3, the state of the lock and its bogie can be unambiguously identified in this way. This information can be fed to a control unit 30, which can be further arranged to control the operation of the motor 7. The matter is shown only schematically in the figures. In this way, the lock can easily be arranged to be remotely controlled in a manner known per se.

Alternatively, the control unit 30 can be placed in the lock body itself or by wiring out of the lock body as required. As further shown in Figure 1, the lock body is also connected to an external power supply.

The invention is not limited to the embodiment shown, but several variations are conceivable within the scope of the appended claims.