EP2628876A2 - Electronic locking cylinder - Google Patents

Abstract

The electronic lock cylinder (10) has cylinder housing (24) which is inserted into opening in a mortise lock (12). A metal shaft (26) is rotatably mounted in cylinder housing along longitudinal axis (27), and is rotatably connected with actuator (28) at axial end. A cam (30) is rotatably mounted at cylinder housing about the longitudinal axis. An electrical or electronic assembly (49) is arranged in actuator. The shaft is connected with the actuator by a thermal protection element (60) made of ceramic or Teflon (RTM: PTFE).

Description

The present invention relates to an electronic lock cylinder with a cylinder housing which is inserted into an opening in a mortise lock, with a shaft which is rotatably mounted about a longitudinal axis in the cylinder housing and is rotatably connected at one axial end with an actuating element with a the cam housing rotatably mounted about the longitudinal axis mounted cam, wherein in the actuating element an electrical and / or electronic assembly is arranged.

Such an electronic lock cylinder is for example from the document DE 10 2005 034 618 A1 known.

The lock cylinder includes a control circuit, which is designed as an access control electronics and allows for verification (verification of authenticity) of the access authorization of a requesting on the side of the actuator access person. The access control electronics carries out a data exchange with an identifier (transponder) of the person requesting access. The transponder may be a passive or an active transponder coupled to an antenna of the assembly in the actuator, in particular in a non-contact manner (e.g., inductive or radio). The assembly may include a suitable antenna for this purpose.

In the assembly is regularly a battery included, which can be based in particular on lithium technology.

If such a lock cylinder to be installed in a fire door, there is generally a potential hazard by the arranged in the actuator battery. In the event of a fire, conventional electronic locking cylinders can even reach temperatures far above 200 ° C, even on the side facing away from the fire. At such temperatures, a battery such as a lithium battery may explode and / or cause a jet of flame.

It is known to receive in the actuator a fire protection element, which may be made for example of an expanded graphite. Upon reaching temperatures of o.g. Magnitude this fire protection element expands by a multiple of its original size, so that the assembly is pushed away from the fire side. In this case, a sleeve provided around the actuating element for forming a knob can be pressed out of a latching with a flange element.

From the document WO 2010/144078 A1 An electronic lock is known. The electronic lock is designed as a motor lock and has on a door inside a door fitting, within which a battery is arranged. Furthermore, an electronic circuit board is arranged in the door fitting. It will proposed here, to arrange a thermal insulation between a door facing the side of the motor lock and the circuit board and / or the lithium battery. In one variant, the battery is completely surrounded by the thermal insulation. In a further variant, a thermal insulation between a lock plate, which adjoins the door, and a circuit board is arranged, wherein a battery is articulated to the engine lock.

Against the above background, it is an object of the invention to provide an improved electronic lock cylinder, which is improved in particular with regard to fire protection.

This object is achieved in the aforementioned electronic lock cylinder characterized in that the shaft is connected to the actuating element via a thermal protection element. With this measure, it is achieved that heat transmitted in particular via the shaft does not transfer to the actuating element as quickly or strongly. In addition, the thermal protection element can be mounted in a comparatively simple manner, since it is arranged in particular outside the cylinder housing and / or outside the actuating element. As a result, structurally no major changes are required compared to such lock cylinders that do not need to be installed in fire doors. Furthermore, the actuating element, which is designed in particular as a knob, may be constructed substantially identical to lock cylinders, which need not be installed in fire doors.

Due to the thermal protection element, the increase in the temperature within the actuating element can be significantly slowed down and / or limited in terms of height.

The thermal protection element is in particular configured (in terms of material and / or in terms of axial length and / or diameter) that the temperature within the actuating element in a conventional fire test remains below an allowable limit, in particular below 250 ° C.

The thermal protection element thus forms a thermal resistance between the shaft and the actuator.

The inventive design of the lock cylinder, it may be possible to dispense with fire protection elements within the actuator. In addition, the actuator can be closed as a whole and not framed be configured (a sleeve can be connected to a flange so that they can not be pushed away with the help of a fire protection element), so that the safety can be increased if necessary.

The electronic assembly within the actuator may be configured to interface with passive transponders operating, for example, at a frequency of 125 kHz or 13.6 MHz. However, it is also possible to provide the electronics with such functionality that coupling with radio transponders or other means of transmission (e.g., capacitive or IR) is possible.

The cam of the electronic lock cylinder can be connected by means of different Aktor- / Kupplungsprinzipien with the shaft, preferably with an electromechanical coupling.

The task is thus completely solved.

Of particular preference is when the thermal protection element is formed as a disc.

Such a disk can be made comparatively easily from thermally insulating materials and moreover can be accommodated between the shaft and the actuating element such that an aesthetically pleasing installation position can be realized.

According to a further preferred embodiment, a diameter of the thermal protection element is equal to an outer diameter of the shaft. hereby For example, the same connection technology between actuator and shaft can be used, as it is used in conventional lock cylinders (which are not designed for use in fire doors).

In general, however, the diameter of the thermal protection element can also be smaller and, in particular, larger than an outer diameter of the shaft.

Furthermore, it is advantageous if the actuating element has a flange element which is connected to the shaft via at least one fastening element.

Such a flange member is a larger diameter member than the shaft and is preferably disk-shaped and is in an installed condition adjacent to a door surface. The diameter of the thermal protection element is preferably smaller than the diameter of the flange element.

The rotationally fixed connection between the actuating element and the shaft is realized by the connection of the flange with the shaft.

It is particularly advantageous if the thermal protection element has at least one through hole for the passage of the fastening element.

In this way, despite the arrangement of the thermal protection element between the shaft and the actuating element, a mechanically secure and stable connection between the actuating element and the shaft can be established. It has been found that providing at least one through-hole in the thermal protection element has little or no adverse effect on thermal insulation. The fastener may be made of metal. Even in this case, a much better insulation of the actuating element is achieved by the thermal protection element. However, the fastening element can also be made, for example, from a thermally insulating material such as plastic, ceramic or the like.

According to a further preferred embodiment, the shaft is formed as a hollow shaft and connected via a plurality of screws with the flange element, which are arranged distributed over the circumference of the shaft.

The formation of the shaft as a hollow shaft allows the implementation of an electrical line from the actuator to a clutch in the cylinder housing. In a corresponding manner, the thermal protection element preferably has a through-hole for carrying out such an electrical conduction.

Further, it is advantageous if the actuating element has a sleeve for receiving the electrical and / or electronic assembly, wherein the sleeve is connected at one axial end to the flange portion (for example by a latching connection) and at the other axial end has a cover through through which a coupling between the module and a transponder is possible.

The sleeve may for example be made of metal, whereas the cover may be made of a plastic material or the like, for example, which allows a coupling between the transponder and assembly.

The latching connection between the sleeve and the flange portion may be designed so that a withdrawal of the sleeve itself by means of a fire protection element may not be possible.

Furthermore, it is altogether advantageous if the thermal protection element has at least one axial projection for torsion-proof and / or captive mounting on the shaft.

On the shaft, more precisely on the end face of the shaft, a corresponding recess for receiving the axial projection can be provided. The dimensions of the axial projection and recess can be chosen in this case that the thermal protection element can be connected largely captive with the shaft, so that the overall assembly can be simplified.

Furthermore, the circumferentially positive connection between the axial projection and the recess in the shaft can also be designed to prevent twisting of the thermal protection element on the shaft.

Possibly. Such an axial projection can also be provided on an axially opposite side of the thermal protection element, for engagement in a corresponding recess of the actuating element (in particular a flange element thereof).

According to a further preferred embodiment, the actuating element in a region between the connection with the shaft and the electrical and / or electronic assembly on a fire protection element which expands when heated above a predetermined temperature.

Such a fire protection element can optionally further improve the thermal insulation between a battery arranged in the actuating element and the shaft.

A lithium battery is preferably part of the electrical and / or electronic assembly. The shaft and the cylinder housing are preferably made of metal. The same applies preferably to an outer portion of the actuating element, which is preferably designed as a sleeve.

The thermal protection element is preferably made of a plastic, of a Teflon material or of a ceramic or of a composite material of such materials.

It is understood that the features mentioned above and those yet to be explained not only in the combination specified in each case, but also in other combinations or alone, without departing from the scope of the present invention.

• Fig. 1 eine schematische Längsschnittansicht durch eine Tür mit einem Einsteckschloss und einer Ausführungsform eines erfindungsgemäßen Schließzylinders in schematischer Form;
• Fig. 2 eine Explosionsansicht eines Teils einer weiteren Ausführungsform eines erfindungsgemäßen Schließzylinders; und
• Fig. 3 eine perspektivische Ansicht einer weiteren Ausführungsform eines erfindungsgemäßen Schließzylinders.

Embodiments of the invention are illustrated in the drawings and are explained in more detail in the following description. Show it:

• Fig. 1 a schematic longitudinal sectional view through a door with a mortise lock and an embodiment of a lock cylinder according to the invention in a schematic form;
• Fig. 2 an exploded view of a portion of another embodiment of a lock cylinder according to the invention; and
• Fig. 3 a perspective view of another embodiment of a lock cylinder according to the invention.

In Fig. 1 a first embodiment of an electronic lock cylinder is generally designated 10.

The lock cylinder 10 is formed as a profile cylinder and used in a conventional manner in a mortise lock 12 which is installed in a door 14 which separates an outer side A from an inner side I.

The lock cylinder 10 serves to actuate an in Fig. 1 schematically illustrated bolt 16 of the castle 12th

Further, the electronic lock cylinder 10 is adapted to contact a transponder 18 in wireless contact. The wireless coupling between the lock cylinder 10 and the transponder 18 is in Fig. 1 schematically designated 20. The coupling 20 can be of an inductive nature, the transponder 18 in this case being generally designed as a passive transponder (eg with 125 kHz or 13.6 MHz). However, the coupling 20 may also be a radio link, as for example used with some active transponders. In general, it is also conceivable that the coupling 20 operates capacitively or on an infrared basis. Instead of a wireless contact and a coupling via a card reader or the like is conceivable.

The lock cylinder 10 has a housing 24, which is designed as a profile housing (DIN profile cylinder).

On the housing 24, a shaft 26 is rotatably mounted, which projects axially relative to the housing 24. An outside actuating element in the form of an outside knob 28 is non-rotatably connected to the shaft 26 via a connection 29 (for example a screw connection).

On the housing 24, a lock bit 30 is also rotatably mounted in a conventional manner per se. The lock bit 30 is engaged with the latch 16.

Between the lock bit 30 and the shaft 26, a schematically illustrated coupling 32 is mounted in the housing 24. The coupling 32 can be actuated by means of a likewise schematically indicated, arranged in the housing 24 actuator assembly 34.

The coupling 32 may be, for example, an electromechanical coupling, which is controlled by means of an electrical signal and between the shaft 26 and the cam 30 can produce a positive connection or frictional engagement.

The lock cylinder 10 also has a control device. The control device includes, for example, an outer or outer control section 40, which is mounted in the outer knob 28. In the outer knob 28, a battery 42 and an antenna 44 are also stored. The outer control section 40 includes a receiving circuit 46, which is connected to the antenna 44 (receiving element), and an evaluation circuit 48. The evaluation circuit 48 is connected to an output of the receiving circuit 46.

The control device further includes, for example, an inner control section 50 which is arranged within the housing 24, seen from the outer side A behind a drill protection 52 also optionally provided in the housing 24.

The drilling protection 52 may be formed in a manner known per se, for example by a plurality of carbide rods extending transversely to the longitudinal axis, by a hard metal plate or the like.

The inner control section 50 is connected to the evaluation circuit 48 by means of an electrical line 54. The electrical line 54 is laid through the shaft formed as a hollow shaft 26 therethrough. The hollow shaft 26 passes through the drill protection 52 therethrough. Furthermore, in the hollow shaft 26, a further Bohrschutzabschnitt 53 may be provided, which rotates with the shaft 26.

The inner control section 50 is further connected to the actuator assembly 34 and is adapted to drive the actuator assembly 34 (to supply with a drive signal 55). As soon as the drive signal 55 is applied to the actuator assembly 34, the clutch 32 is closed. The drive signal 55 can be applied, for example, by the actuator assembly 34 is energized.

The general operation of the electronic lock cylinder 10 is as follows.

In the idle state of the electronic lock cylinder, the clutch 32 is opened. The outer knob 28 and the shaft 26 are freely rotatable with respect to the housing 24. Persons who have no access authorization in the form of a valid transponder (with valid identity code) can therefore not open the door 14 from the outside A.

The electronic lock cylinder 10 is formed as a half cylinder. From the inside I there is no way to operate the lock bit 30. It is conceivable that the door 14 is formed as an escape door, the lock 12 is always open from the inside I, for example, by depressing a door handle, which also actuates the latch 16. The electronic lock cylinder 10 may also be designed as a double cylinder. In this case, no one cam be rigidly connected to another shaft, which is for example rotationally fixedly connected to an inner knob.

If a person with an authorized transponder 18 requires access, a data exchange takes place between the transponder 18 and the outer control section 40 via the coupling 20 and the antenna 44. The authenticity of the transponder 18 is checked in the outer control section 40. In other words, it is evaluated in the outer control section 40 whether an authorization signal transmitted by the transponder 18 (with an identity code contained therein, for example) entitles it to perform a closing operation on the door 14, ie to unlock the latch 16, for example.

If the transponder 18 does not transmit a valid authorization signal 20, the process is aborted.

If the authenticity of the transponder 18 is confirmed (the transponder 18 thus carries a valid identity code), the outer control section 40 outputs a code signal to the inner control section 50 via the line 54, the code signal containing an identification code.

The identification code can theoretically be equal to the identification code of the transponder 18. However, it is usually a simpler code in the form of a binary code with 32 bits, for example.

The transmitted to the inner control section 50 identification code may be a fixed code for each lock cylinder 10 code. However, it is also possible that the identification code is generated by means of a so-called master transponder, as a cylinder-specific 32-bit key for the Communication between the outer control section 40 and the inner control section 50. In such a "programming operation", the code in the inner control section 50 is fixedly stored. A reprogramming is possible only by re-using the master transponder, in which case a new identification code can also be programmed.

The specification of the identification code with 32 bits is only to be understood as an example. It is understood that the number of bits can also be smaller or larger, for example in the range of 16 to 64 bits.

Furthermore, the code can also be designed as a change code, which is changed with each new closing operation. Of course, this requires a more complicated communication between the inner and outer control sections 50, 40.

Furthermore, it is also possible that the security is increased even further, by additional authentication mechanisms (eg in the form of the so-called "mutual authentication"), wherein the coding or decoding a random number is used, which is multiplied, for example, with the binary code , The random number may be based on a pseudo-stochastic system, wherein the same pseudo-random sequence of random numbers is stored both in the outer control section 40 and in the inner control section 50, so that synchronization takes place without being transmitted via the line 54.

If, after receiving a valid authorization signal 20 from a transponder 12, the outer control section 40 sends a code signal with the identification code to the inner control section 50, then the code signal is decoded there (compared, for example, with the binary code stored there). If the identification code received in the code signal proves to be valid in the inner control section, the drive signal 55 is output to the actuator arrangement 34 and thereby the clutch 32 is closed. Then, the lock bit 30 can be operated by means of the outer knob 28 so as to perform a closing operation.

The actuator assembly 34 drives the clutch 32, for example, for a predetermined period of a few seconds. After the period of time, the clutch 32 is automatically opened again, so that the idle state is restored.

The inner control portion 50 and the actuator assembly 34 are located together with the lock bit 30 behind the Bohrschutz 52, 53, as seen from the outside A of.

Even if the outside knob 28 should be removed without authorization, the actuator assembly 34 can not be operated by energizing, for example, the electrical line 54 yet. Because to generate the drive signal 55, it is necessary that the inner control section 50 receives the code signal with the valid identification code.

Therefore, a manipulation of the outside A is excluded, despite the arrangement of a major part of the control device in the outer knob 28th

Upon receipt of a valid authorization signal 20 may be in the electronic lock cylinder 10 of Fig. 1 a buzzer 56 is activated, which indicates by a visual and / or acoustic signal that a valid authorization signal has been received.

The inner control section 50 is formed as a kind of electronic safety circuit inside the housing 24.

In the region of the connection 29 between the shaft 26 and the outer knob 28, a thermal protection element 60 is arranged. More specifically, the shaft is connected to the outside knob 28 via the thermal protector 60. In the event of a fire on the inside I, the heat development can be so great that heat is transported via the housing 24 and the shaft 26 in the direction of the outside knob 28 becomes. By the thermal protection element 60, which acts as a thermal resistance, it can be achieved that the temperature rise within the outer knob 28 is much slower and possibly limited to a temperature which is less than a hazard temperature at which, for example, the battery 42 could explode , The battery 42 is preferably designed as a lithium battery and therefore particularly sensitive to heat.

In addition, within the outer knob 28, a schematically indicated fire protection element 62 may be arranged, which is realized, for example, on expanded graphite base. The fire protection element 62 expands when heat develops in case of fire and contributes to a thermal insulation, in particular the battery 42, possibly also of the control section 40 at.

The lock cylinder 10 of Fig. 1 is therefore suitable for installation in fire doors. The lock cylinder 10 of Fig. 1 is designed as a so-called. Semicylinder, but may also be designed as a double cylinder. In this case, the housing 24 may extend to the inside I. The cam 30 may be rigidly connected to another shaft extending to the inner side I and there rotatably connected to an inner knob. In this case, the door 14 can always be opened from the inside I via the inside knob.

In such a double cylinder, the resulting heat due to a fire on the inside over the inner knob and the further shaft and the housing 24 and the shaft 26 can propagate towards the outer knob 28, so that in this case the use of the thermal protection element 60, if necessary even more important.

In Fig. 2 is a part of another embodiment of a lock cylinder 10 shown in exploded view. The lock cylinder 10 of Fig. 2 corresponds in terms of design and operation generally the lock cylinder of Fig. 1 , The same elements are therefore provided with the same reference numerals. The following section essentially deals with the differences.

The lock cylinder 10 of Fig. 2 has an outside knob 28 which has a flange 66 adjacent the door. The diameter of the flange 66 is greater than the diameter of the shaft 26. The flange 66 is connected to the shaft 26 via a plurality of fasteners in the form of screws 68. For this purpose, a plurality of threaded holes 70 is provided in an end face of the shaft 26 (four threaded holes in the present case). Further, a corresponding plurality of through holes 72 are provided in the flange 66, can be inserted through the shafts of the fasteners 68.

The outer knob 28 also has an assembly holder 74. The assembly holder 74 has a substantially cylindrical shape and is surrounded by a likewise substantially cylindrical sleeve 76 made of metal. The sleeve 76 may cooperate at one axial end with detent means 78 on the outer periphery of the flange member 66 to thereby fix the sleeve 76 to the flange member 66. At the axially opposite end, the sleeve 76 is closed by a cover 80, which allows a coupling between a transponder and the antenna provided as a ring antenna 44, which is covered by the cover 80 in the installed state. The cover 80 is preferably made of a plastic material or the like to facilitate this coupling. The transponder is preferably an inductive or a radio transponder and is designed to establish a non-contact coupling with the antenna 44.

The assembly holder 74 includes a compartment for receiving the battery unit 42, which may preferably have two single batteries. The battery unit can be connected via a plug connection to a control section 40, which is likewise fixed to the module holder 74 (which can be seen in FIG Fig. 2 for reasons of clarity not shown).

Between the module holder 74 and the heads of the screws 68, a fire protection element made of expandable graphite is arranged, which is disc-shaped in the present case. At the side facing the module holder 74 side of the flange 66 further comprises a plurality of circumferentially distributed Recesses 82 are provided, which are formed as Sackausnehmungen and can also be used in the correspondingly shaped, circular segment fire protection elements.

Between the end-side end face of the shaft 26 and the flange member 66, a thermal protection element 60 is arranged in the form of a relatively flat disc. The thermal protection element 60 has a plurality of through holes 83 through which the shanks of the screws 68 can be passed. Further, the thermal protection element 60 on the shaft 26 facing axial side at least one axial projection 84 which can engage in a corresponding recess 85 on the end face of the shaft 26 to achieve in this way an anti-rotation or captive.

The axial projection 84 may be formed eccentrically to the longitudinal axis 27. In the present case, the axial projection 84 is formed as an axial pin. Alternatively or additionally, an axial projection 84 'may be formed in the form of a circular section which engages in a corresponding circular section recess 85' on the end face of the shaft 26.

The shaft 26 is formed as a hollow shaft, and in the flange member 66, a central through hole is formed (in Fig. 1 not further described). Here, an electrical line can be guided, which connects a control section 40 of the outer knob 28 with an inner control section 50 of the lock cylinder 10. Similarly, the thermal protection element 60 preferably also has a central through hole for performing such electrical conduction.

The screws 68 may be made of metal, but may be made of plastic or ceramic or the like.

The shaft 26 and the flange 66 are preferably made of metal. The sleeve 76 is also made of metal with the cover 80 made of Plastic or the like is made. The assembly holder 74 is preferably made of plastic.

Fig. 3 shows a further embodiment of a lock cylinder 10, which generally with respect to structure and operation of the lock cylinder 10 of Fig. 2 equivalent. The same elements are therefore identified by the same reference numerals. The following section essentially explains the differences.

The lock cylinder 10 of Fig. 3 is designed as a double cylinder and is constructed identically in the direction of the outside A as the lock cylinder 10 of Fig. 2 , In Fig. 3 the lock cylinder 10 is shown in the assembled state.

The housing 24 is formed as a profile cylinder housing and has a longitudinally extending web portion 86 through which a bore 88 is formed for a forend screw (in the direction transverse or skewed to the longitudinal axis).

Furthermore, the housing 24 has a first annular portion 90, on which the shaft 26 is rotatably mounted. The housing 24 further has a second annular section 92 offset in the direction towards inner side I, on which an inner shaft 94 is rotatably mounted. The inner shaft 94 is rotatably connected to the cam 30, which is also rotatably mounted on the housing 24. The inner shaft 94 is rotatably connected to an inner knob 96.

Claims (11)

An electronic lock cylinder (10) having a cylinder housing (24) which can be inserted into an opening in a mortise lock (12), with a shaft (26) which is rotatably mounted about a longitudinal axis (27) in the cylinder housing (24) and on an axial end with an actuating element (28) is rotatably connected, with a on the cylinder housing (24) rotatably mounted about the longitudinal axis of the cam (30), wherein in the actuating element (28) an electrical and / or electronic assembly (49) is
characterized in that
the shaft (26) is connected to the actuating element (28) via a thermal protection element (60). Electronic lock cylinder according to claim 1, characterized in that the thermal protection element (60) is formed as a disc. Electronic lock cylinder according to claim 1 or 2, characterized in that a diameter of the thermal protection element (60) is equal to an outer diameter of the shaft (26). Electronic lock cylinder according to one of claims 1 - 3, characterized in that the actuating element (28) has a flange element (66) which is connected via at least one fastening element (68) with the shaft. Electronic lock cylinder (60) according to claim 4, characterized in that the thermal protection element (60) has at least one through hole (83) for the passage of the fastening element (68). Electronic lock cylinder according to claim 4 or 5, characterized in that the shaft is formed as a hollow shaft and is connected via a plurality of screws (68) with the flange member (66) which are arranged distributed over the circumference of the shaft (26). An electronic lock cylinder according to any one of claims 4-6, characterized in that the actuating element (28) comprises a sleeve (76) for receiving the electrical and / or electronic assembly (49), wherein the sleeve (76) at one axial end with the Flange portion (66) is connected and at the other axial end of a cover (80) through which a coupling between the assembly and a transponder (18) is made possible. Electronic lock cylinder according to one of claims 1 - 7, characterized in that the thermal protection element (60) has at least one axial projection (84) for torsion-proof and / or captive mounting on the shaft (26). An electronic lock cylinder according to any one of claims 1-8, characterized in that the actuating element (28) in a region between the connection (29) with the shaft (26) and the electrical and / or electronic assembly (49) has a fire protection element (62). which expands when heated above a predetermined temperature. An electronic lock cylinder according to any one of claims 1-9, characterized in that the shaft (26) is made of metal. Electronic lock cylinder according to one of claims 1 - 10, characterized in that the thermal protection element (60) is made of a plastic, Teflon or a ceramic.

Images