DE10020038A1 - Electromagnetically activatable locking mechanism - Google Patents

Abstract

The mechanism has a locking bar (16) forming a unit with an armature and able to be moved into the path of motion of a core (2), an electromagnet (14) for holding the armature in a release position, a blocking spring and control electronics (12). The control electronics are activated by detecting an electromagnetic pulse of the electromagnet produced when inserting a key or initial rotation of the core causes movement of the locking bar

Description

The invention relates to an electromagnetically activated baren locking mechanism, especially for a lock cylinder of a mortise lock for optional blocking Ren or release one arranged in a housing movable core, with a structural unit with an anchor, in the path of movement of the core feasible locking bolt, with one in the open position to the Hal the anchor in one movement of the core designed the release of the locking bolt Elektro magnets, with a locking position for pre-tensioning the Locking bolt in a block the movement of the core Position designed locking spring and with a control elec electronics for controlling the electromagnet.

Such locking mechanisms are particularly common in modern Access control systems for buildings are often used and are known for example from EP 0 600 194 B1. This document describes a locking cylinder with next to the electromagnetically activated locking mechanism orderly, mechanical pin tumblers. A key for turning the core has a data memory, which at Insert the key into the lock cylinder from the Control electronics is read out. A control center controls the electromagnet depending on the read out Data. Moved when activated by the control center the electromagnet the pin-shaped locking bolt from a position locking the core to the housing against the force of the locking spring in a rotation of the  Kern's enabling position. This locking mechanism he demands a high level of cabling for each individual Lock cylinder and high power consumption at the Movement of the locking bolt. Furthermore, the tax Electronics always on standby, leading to a wide contributes to increasing electricity consumption.

It has already been thought of in the lock cylinder Reducing power consumption when introducing the Key operated in the lock channel switch watch. When inserting a key, the Switch activates the control electronics. A constant Electricity-consuming readiness of the control electronics is avoided. However, this is disadvantageous the high structural complexity of the switch and the cost intensive production of the locking cylinder by the arrangement Switch wiring and wiring.

The invention is based on the problem of an electro magnetically activated locking mechanism of the entrance mentioned kind so that he is a special enables simple activation of the control electronics and is as simple as possible.

This problem is solved according to the invention by the Er Detection of an electromagnetic pulse of the electroma were the same when inserting a key or movement caused by the initial rotation of the core the locking bolt and by activating the tax electronics by means of the pulse. This impulse comes because arrangements of such electrical magnets always have a certain remanence when this not intentionally taking special precautions  is pressed. As a result of this remanence, it occurs in external Actions to an induction, which according to the invention as Wake-up pulse is used.

With this design, the control electronics can abge switches and thus be without power consumption if none Key inserted into the locking channel or the core is not rotated. This will make the control electronics automatically activated when using the locking mechanism fourth. Constant electricity consumption when ready the control electronics is avoided. The inventor Lock mechanism according to the invention thus has a special low power consumption. The control electronics needed no switch to activate them. Because the electro magnet and the locking bolt are present anyway, expl the locking mechanism according to the invention no additional Lich components to be assembled and is therefore special simply set up. With a knob cylinder, the Akti vation of the control electronics instead of inserting the Key also slightly moves the knob axially the.

To strengthen the momentum is in a training the invention provided that by the remanence of Electromagnet magnetic field formed by an additional Lich arranged permanent magnet is reinforced. In order to reliability is increased because the impulse measurable threshold value for the control electronics more clearly exceeds.

The pulse of the electromagnet is according to one advantage adhere to further development of the invention, if the anchor when inserting the key or when  initial turning of the core from one of the electro magnet spaced position in one on the electric Magnet adjacent position is movable. Through the the impulse becomes clearly noticeable stations of the control unit, for example, by external Magnetic fields are largely avoided. Wei terhin can by this design of the electromagnet Activation by the control electronics the anchor in ner adjacent position and thus the locking bolt in one hold the position allowing the core to rotate. There with the anchor in contrast to the well-known Sperrme mechanism of the electromagnet not against the force the locking spring are moved. This contributes in comparison the known locking mechanism to a clear Ver reduction in electricity consumption. Without control the locking bolt from the locking spring into the core blockie Moving position and thus the anchor of the Electromagnet removed. The stroke of the locking bolt at Insert the key or when initially turning can also be very large, so that the locking bolt with every rotation of the core, even when the Electromagnet is moved. This is a through Rusting or sticking caused jamming of the Barrier bar largely avoided. Due to the large stroke the locking bolt is also the safe generation of the Im pulses guaranteed.

The locking mechanism according to the invention is con structurally particularly simple if the core fits into one Has recess protruding recess, when the locking bar rests on the displacement element or is made in one piece with this and if the Ver pushing element when inserting a key into one  Locking channel of the core is designed to be movable. In the The recess can be, for example, the closing box act. The one generated when the key was inserted Movement of the locking bolt can be very large measure up.

The displacement element is according to another advantage adhere to the invention against pollution and Damage caused by the in the lock cylinder key particularly reliably protected if the displacement element in a itself to the locking channel subsequent recess of the core penetrates and when a from a key that can be inserted into the locking channel movable control element for moving the displacement element is designed.

The locking mechanism according to the invention requires a be particularly small number of components to be assembled, if the core is a groove for receiving a pre-cut that portion of the free end of the locking bar.

The displacement element is designed according to another ren advantageous development of the invention particularly inexpensive if it is designed as a ball.

The locking mechanism according to the invention requires a be particularly small number of components to be assembled, if the actuator has a sliding pot with a Displacement element has opposite chamfer.

The locking mechanism according to the invention is suitable for two opposing control elements for arrangement  opening in a lock that can be unlocked from both sides cylinder.

The control element or the control elements are according to ei ner other advantageous development of the invention held reliably in its intended position and against guided the displacement element when the actuator or the adjusting elements are axially displaceable on a sleeve are led.

With lock cylinders that can be unlocked from both sides the locking mechanism according to the invention con structurally particularly simple when facing each other standing, each designed as sliding pots elements arranged within the sleeve Spring biased against stops in the core are.

Contamination and thus possible jamming of the Locking bar can be advantageous according to another Simply avoid further development of the invention if the All-round stops in the core for the control elements tet and an O-ring to seal the Stellele have elements opposite the core. Furthermore, these are Control element and the corresponding stops in the core hereby constructed rotationally symmetrically and can be therefore manufacture particularly inexpensively.

To further reduce the risk of pollution the locking bolt carries it advantageously according to another ten further development of the invention when the core against sealed over the housing in the area of the locking bolt is. O-rings are particularly suitable for sealing.

The invention permits numerous embodiments. For There are two more to clarify its basic principle of shown in the drawing and are below described. This shows in

Fig. 1 shows a longitudinal section through a lock cylinder with a lock mechanism according to the invention,

FIG. 2a is a greatly enlarged view of a locking device of the locking mechanism of FIG. 1,

FIG. 2b shows the locking device of Fig. 2a with inserted into a key channel key,

Fig. 3 shows a cross section through the lock cylinder of FIG. 1 along the line III-III,

Fig. 4 shows a locking cylinder in cross section with a further embodiment of the locking mechanism according to the invention.

Fig. 1 shows a lock cylinder that can be unlocked from two sides with a housing 1 and a core 2 arranged in a rotating bar therein. The core 2 has a locking bit 3 in its central region and a locking channel 4 , 5 at its ends for inserting a key 6 shown in FIG. 2b. The closing channels 4 , 5 have a round cross section. For transmission egg ner rotary movement of the key 6 on the core 2 , each driver 7 , 8 are arranged on the end faces of the core 2 . The drivers 7 , 8 are used to generate a positive connection with a not shown reid of the key 6 . The locking cylinder has an electronically activatable locking mechanism, each with code receivers 9 , 10 arranged near the end faces of the housing 1 and with a locking device 13 . The code receivers 9 , 10 detect signals from transponders 11 of the key 6 and route them to control electronics 12 . The control electronics 12 determines from the signals of the trans ponder 11 whether the key 6 is authorized to unlock the locking cylinder. If there is a right, the control electronics 12 controls the locking device 13 . The locking device 13 has an elec tromagnet 14 and one of a locking spring 15 in Rich direction of the core 2 biased locking bolt 16th The locking bar 16 is made with an electromagnet 14 facing the armature 17 as a structural unit. To power the control electronics 12 and the locking device 13 , a battery 18 is arranged in the housing 1 . The locking device 13 is constructed symmetrically and has a slide 19 for transmitting an axial movement of a key inserted into the right locking channel 5 .

Fig. 2a shows greatly enlarged the locking device 13 of FIG. 1 with a locking bolt 16 to the holder ends Ver drängungselement 20th The displacement element 20 is designed as a ball and holds the locking bolt 16 in a position in which the armature 17 is at a distance from the electric magnet 14 . The locking device 13 has two oppositely arranged adjusting elements 21 , 22 , each with a sliding cup 24 , 25 guided on a sleeve 23 . The sliding pots 24 , 25 are the displacement element 20 with a chamfer 26 , 27 opposite. In the sleeve 23 , a spring 28 for biasing the sliding pots 24 , 25 away from the displacement element 20 against circumferential stops 29 , 30 of the core 2 is arranged. The sliding pots 24 , 25 and the core 2 are sealed in the area of the locking device 13 by means of O-rings 31 , 32 .

The electromagnet 14 is de-energized in the position of the locking device 13 shown in FIG. 2a and the control electronics 12 are deactivated. When inserting a key 6 into the locking channel 4 , 5 , the corresponding actuating element 21 , 22 is moved from the front end of the shaft of the key 6 or from the slide 19 to the other actuating element 21 , 22 and the displacement element 20 is pressed down . As a result, the locking bolt 16 is moved with the armature 17 against the electromagnet 14 .

This position is shown in Fig. 2b. When the armature 17 moves against the electromagnet 14, it generates a pulse which activates the control electronics 12 . This now receives the signals of the transponder 11 of the key 6 and evaluates them. When the key 6 is unlocked for unlocking the locking device 13 , a voltage is applied to the electromagnet 14 for an intended period of time. As a result, the armature 17 remains in the position shown, which bears against the electromagnet 14 . The electromagnet 14 therefore only has to hold the armature 17 in the adjacent position when the locking mechanism is unlocked. An energy-consuming movement of the armature 17 by the electromagnet 14 is therefore not necessary. If the key 6 is not authorized to unlock the locking mechanism, the actuation of the electromagnet 14 remains, so that the locking spring 15 prestresses the locking bolt 16 in the direction of the core 2 . When the core 2 is rotated without a key 6 with lock authorization, the locking bolt 16 reaches the locking recesses 33 , 34 of the core 2 shown in FIG .

Fig. 3 shows the lock cylinder with the locking mechanism of FIG. 1 in a cross section along the line III-III. It can be seen here that the locking troughs 33 , 34 are arranged on both sides of the displacement element 20 . Furthermore, the locking bolt 16 is shown in section in the drawing. The locking bolt 16 is hollow on the inside and is slightly pivotable and axially displaceably connected to the armature 17 . The locking bolt 16 and the anchor 17 are also clamped apart by a spring 35 . This design serves the tolerance compensation and ensures a uniform contact of the core 17 with the electromagnet 14 and prevents jamming of the locking bolt 16 when the armature 17 is tightened by the electromagnetic 14 .

Fig. 4 shows a further embodiment of the locking mechanism according to the invention in cross section. Here, the rotatable in the housing 1 core 36 between two Sperrmul 37 , 38 has a groove 39 for receiving a pre-hen section of the free end of the locking bolt 16th With an initial rotation of the core 36 , the locking bolt 16 is pressed out of the fillet 39 . The armature 17 then comes against the electromagnet 14 . The electromagnet 14 generates a pulse for activating the control electronics 12 shown in FIG. 1. The function and mode of operation of the electromagnet 14 is described as in the embodiment according to FIGS. 1 to 3. In order to amplify the pulse generated by the electromagnet 14, a permanent magnet 40 is additionally arranged at the lower end, through which the magnetic field caused by the remanence is increased to a certain minimum field strength.

Claims (13)

1. Electromagnetically activatable locking mechanism, in particular for a lock cylinder of a mortise lock for selectively blocking or releasing a movable core arranged in a housing, with a structural unit with an armature forming an in the path of movement of the core lockable ren, with a Open position for holding the armature in a movement of the core through the locking bolt releasing position gestalte th electromagnet, with a locking position designed to bias the locking bolt into a blocking position of the movement of the core locking spring and with control electronics for controlling the electromagnet, characterized by the detection of an electromagnetic pulse of the Elektromagne th ( 14 ) when a key ( 6 ) or during the initial rotation of the core ( 2 , 36 ) caused movement of the locking bolt ( 16 ) and by activating the control electronics ( 12 ) with means of the impulse. 2. Locking mechanism according to claim 1, characterized in that to strengthen a remanence of the electromagnet ( 14 ), a magnetic field is amplified by an additionally arranged permanent magnet ( 40 ). 3. Locking mechanism according to claim 1 or 2, characterized in that the armature ( 17 ) when inserting the key ( 6 ) or during the initial rotation of the core ( 2 , 36 ) from a position spaced apart from the electromagnet ( 14 ) into one the electromagnet ( 14 ) adjacent position is movable. 4. Locking mechanism according to claim 1, 2 or 3, characterized in that the core (2) into a Ausneh mung which projects displacement element (20) comprises that the locking bolt (16) element to the displacement (20) abuts and that the Displacement element when inserting a key ( 6 ) in a locking channel ( 4 , 5 ) of the core ( 2 ) is designed to be movable. 5. Locking mechanism according to at least one of the preceding claims, characterized in that the displacement element ( 20 ) in a closing channel ( 4 , 5 ) adjoining recess of the core ( 2 ) penetrates and that one of one in the closing channel ( 4th , 5 ) insertable key ( 6 ) movable position element ( 21 , 22 ) for moving the displacement element ( 20 ) is designed. 6. Locking mechanism according to at least one of the preceding claims, characterized in that the core ( 36 ) has a groove ( 39 ) for receiving a portion of the free end seen before the Sperrie gel ( 16 ). 7. Locking mechanism according to at least one of the preceding claims, characterized in that the displacement element ( 20 ) is designed as a ball. 8. Locking mechanism according to at least one of the preceding claims, characterized in that the actuating element ( 21 , 22 ) has a sliding pot ( 24 , 25 ) with a displacement element ( 20 ) opposite bevel ( 26 , 27 ). 9. Locking mechanism according to at least one of the preceding claims, characterized by two mutually opposite on each side of the Verdrängungsele element ( 20 ) adjacent actuating elements ( 21 , 22 ). 10. Locking mechanism according to at least one of the preceding claims, characterized in that the actuating element ( 21 , 22 ) or the actuating elements are guided axially displaceably on a sleeve ( 23 ). 11. Locking mechanism according to at least one of the preceding claims, characterized in that the mutually opposed, each as sliding pots ( 24 , 25 ) formed adjusting elements ( 21 , 22 ) by means of a spring ( 28 ) arranged inside the sleeve ( 23 ) against each other Stops ( 29 , 30 ) in the core ( 2 ) are biased. 12. Locking mechanism according to at least one of the preceding claims, characterized in that the stops ( 29 , 30 ) in the core ( 2 ) for the adjusting elements ( 21 , 22 ) are circumferential and an O-ring ( 31 , 32 ) for sealing of the adjusting elements ( 21 , 22 ) relative to the core ( 2 ). 13. Locking mechanism according to at least one of the preceding claims, characterized in that the core ( 2 , 36 ) with respect to the housing ( 1 ) is sealed in the region of the locking bolt ( 16 ).