SE1650221A1

SE1650221A1 - Electronic door lock operating device

Info

Publication number: SE1650221A1
Application number: SE1650221A
Authority: SE
Inventors: Svedberg Michael
Original assignee: Hallandia Innovation Ab
Priority date: 2016-02-19
Filing date: 2016-02-19
Publication date: 2017-08-20
Also published as: EP3417130A1; WO2017142471A1; SE539749C2; EP3417130A4

Abstract

18 ABSTRACT The present invention relates to an electronic door lock operatingdevice (3) configured to operate a door lock (5) by moving a lock bolt (9) of anassociated lock case (7), the device (3) comprising an electric motor (21), alock bolt operating member (25), the lock bolt operating member (25) beingconnectable to a lock bolt following member (27) of a door lock (5), and acoupling arrangement (23) for connecting the motor (21) to the lock boltoperating member (25). The coupling arrangement (23) comprises a first rotatable couplingmember (35), which is fixedly connected to an output shaft (37) of the motor(21 ), a second rotatable coupling member (39), which is pivotally anddisplaceably connected to a shaft (37), the second coupling member (39)being axially movable between a disengaged position, to which it is biased, inwhich it is prevented from rotating relative to the first coupling member (35)and in which the motor (21) is disconnected from the lock bolt operatingmember (25), and an engaged position, in which the coupling arrangement(23) connects the motor (21) to the lock bolt operating member (25). Elected for publication: Figure 2.

Description

ELECTRONIC DOOR LOCK OPERATING DEVICE Technical Field of the lnventionThe present invention relates to an electronic door lock operating device configured to operate a door lock by moving a lock bolt of anassociated lock case, the device comprising an electric motor, a lock boltoperating member, the lock bolt operating member being connectable to alock bolt following member of a door lock, and a coupling arrangement forconnecting the motor to the lock bolt operating member.

Background ArtRetrofittable lock operating devices for conventional deadbolt locks are widely used today. WO2011/160628 discloses such a lock operating device.The lock operating device has an electric motor which is in connection withthe lock bolt via a transmission. Upon activation of the electrical motorrotational movement of the motor is transmitted to the lock case for locking orunlocking the door. The door lock may also be operated manually from theinside by turning a lock knob.

Also, the lock operating device has an electromagnetic couplingarrangement that disengages the electrical motor when not activated.

However, this coupling arrangement is considered to be complex.Furthermore, the power consumption of such a device is considered to behigh.

Summary of the lnvention lt is an object of the present invention to provide an improvedelectronic door lock operating device.

These and other objects that will be apparent from the followingsummary and description are achieved by an electronic door lock operatingdevice according to the appended claims.

According to an aspect of the present disclosure there is provided anelectronic door lock operating device configured to operate a door lock by moving a lock bolt of an associated lock case, the device comprising anelectric motor, a lock bolt operating member, the lock bolt operating memberbeing connectable to a lock bolt following member of a door lock, and acoupling arrangement for connecting the motor to the lock bolt operatingmember, wherein the coupling arrangement comprises a first rotatablecoupling member, which is fixedly connected to an output shaft of the motor,a second rotatable coupling member, which is pivotally and displaceablyconnected to a shaft, the second coupling member being axially movablebetween a disengaged position, to which it is biased, in which it is preventedfrom rotating relative to the first coupling member and in which the motor isdisconnected from the lock bolt operating member, and an engaged position,in which the coupling arrangement connects the motor to the lock boltoperating member.

Since the second coupling member is pivotally connected to a shaft,which may be an extension of the motor output shaft, the first couplingmember may rotate relative to the second coupling member with respect to acentral axis of the coupling arrangement. This has the advantage that the firstcoupling member may, upon rotation relative to the second coupling member,move the second coupling member to an engaged position. By rotating themotor output shaft the second coupling member may thus be moved from adisengaged position, in which the motor is disconnected from the lock boltoperating member, to an engaged position, in which the motor is connected tothe lock bolt operating member for transferring power thereto.

When the second coupling member is in a disengaged position it isprevented from rotating relative to the first coupling member in order to allowthe first coupling member to rotate relative to the second coupling memberand move the second coupling member axially. Upon the axial movement ofthe second coupling member from a disengaged position to an engagedposition, a friction force may, as long as the second coupling member is in adisengaged position, prevent the second coupling member from rotating withthe first coupling member. Upon continued rotation of the first couplingmember in the same direction when the second coupling member hasreached an engaged position, in which the second coupling member is engaged with the first coupling member, the second coupling member rotateswith the first coupling member. Then, the lock bolt operating member, whichis in mechanical engagement with the first coupling member via the secondcoupling member also rotates. ln the engaged position the first couplingmember, the second coupling member and the lock operating member arethus engaged with each other so as to rotate together as a single unit.

When the coupling arrangement is in the engaged position theelectrical motor is thus operatively connected to the lock bolt followingmember. A door locking operation, or a door unlocking operation, may thenbe performed by means of the motor. During a door locking operation, whichinvolves movement of the lock bolt of a lock case from a retracted positioncorresponding to a door unlocked position to a protruded positioncorresponding to a door locked position, the motor output shaft is rotated inone direction, and during a door unlocking operation, which involvesmovement of the lock bolt from a protruded position to a retracted position,the motor output shaft is rotated in an opposite direction. The second couplingmember may thus be moved to an engaged state by the first couplingmember, which is fixed to the motor output shaft, in a simple manner bymeans of the motor. Hence, no additional actuator for moving the secondcoupling member to an engaged position is needed, which provides for acompact solution.

The operation of an existing lock case may vary. For instance, in oneexisting lock case one revolution of the lock following member is required toperfom a locking or unlocking operation. Another existing lock case requirestwo revolutions of the lock following member to perform a locking or unlockingoperation. ln the engaged position, the second coupling member may rotate freelywithout limitation. This has the advantage that the lock operating device maybe used on an existing lock regardless of to which extent the lock followingmember of the actual lock case has to be turned to move the lock bolt from adoor unlocked position to a door locked position in order to perform a doorlocking operation. Hence, the coupling arrangement allows the device to be used for many different existing lock cases and thus provides for a flexiblesolution.

The coupling arrangement enables a compact and slim solution withlow power consumtion since the second coupling member is moved axiallybeetween a disengaged position and an engaged position. Furthermore, thecoupling arrangement provides for a robust solution since the secondcoupling member is moved axially upon connecting and disconnecting of themotor.

Furthermore, the axial movement of the second coupling memberenables the position thereof to be determined in a very accurate manner.Hence, control electronics of the electronic door lock operating device mayalways be aware of the exact axial position of the second coupling memberand thereby whether the second coupling member is situated in a disengagedor in an engaged position, i.e. if the motor is disconnected from or connectedto the lock bolt operating member. This has the advantage that mechanicalend positions of the lock bolt of a lock case may be avoided. The rotationalmovement of the motor may thus be stopped before such a mechanical endstop is reached, which minimizes power consumption and wear on the motorand wear parts. Hence, the electric motor may be controlled in a way thatsaves power and/or minimizes the need for maintenace and/or extends thelife of components of the lock operating device. A cost and power efficientlock operating device having a long service interval may thus be achieved.

Furthermore, the coupling arrangement enables the electric motor tobe disconnected from the lock bolt operating member and thus allows manualoperation a mechanical door fitted with the electronic lock operating device. Adoor lock provided with the electronic door lock operating device may thus beoperated manually by turning a lock knob or using a mechanical key. Thedoor lock may thus be operated either electrically or manually using the doorlock operating device.

According to one embodiment the coupling arrangement comprises aramp device configured to, upon rotation of the first coupling member relativeto the second coupling member, move the second coupling member from saiddisengaged position to said engaged position. This has the advantage that the second coupling member may be moved between a disengaged positionand an engaged position in a very controllable manner.

According to one embodiment the coupling arrangement comprises afriction element arranged to prevent the second coupling member fromrotating with the first coupling member when the second coupling member isin a disengaged position. The friction element is thus arranged to apply afriction force to the second coupling member that prevents the secondcoupling member from initially rotating with the first coupling member and aslong as the second coupling member is in a disengaged position.

The coupling arrangement may thus comprise a separate frictionelement, e.g. in the form of a magnetic element or a spring element. Thefriction element prevent the second coupling member from rotating with thefirst coupling member until the second coupling member engages the lockoperating member, i.e. until the second coupling member has reached anengaged position.

The friction element thus forces the second coupling member to moveaxially to an engaged position, i.e. into engagement with each of the firstcoupling member and the lock bolt following member. Upon continuedrotation of the first coupling member in the same direction the secondcoupling member rotates with the first coupling member. Then, the lock boltoperating member is operatively connected to the first coupling member viathe second coupling member.

According to one embodiment the coupling arrangement furthercomprises a guide device adapted to guide the the second coupling memberto move substantially axially along a coupling shaft of the couplingarrangement. The second coupling member may thus be moved axially underthe guidance of a guide device.

According to one embodiment the guide device comprises a guideelement being connected to the second coupling member and having aprojecting portion, and a guide aperture for receiving the projecting portion ofthe guide element. The second coupling member may thus be moved axiallyunder the guidance of a guide element.

According to one embodiment the guide element is magneticallyconnected to the second coupling member.

According to one embodiment the guide element is connected to thesecond coupling member by means of a biasing element, such as a biasingspnng.

According to one embodiment the guide element is ring-shaped.

According to one embodiment the electronic door lock operating devicefurther comprises a linear position sensor for determining the position of thesecond coupling member. The linear position sensor may be arranged todetermine the axial position of a guide element of the coupling arrangement.This allows the axial position of the second coupling member to bedetermined with very high precision.

According to one embodiment the position sensor comprises an opticalsensor, a hall effect sensor or a micro switch.

According to one embodiment the lectronic door lock operating devicefurther comprising a motion sensor, such as a pulse sensor or rotary encoder,for controlling the motor.

According to one embodiment the electronic door lock operating devicefurther comprises a linear position sensor for determining the position of thesecond coupling member and a motion sensor for controlling the motor The combination of a linear position sensor for determining the axialposition of the axially displaceably second coupling member and a motionsensor for controlling the motor enables accurate control of the door lockoperating device. The door lock operating device may thus be operatedwithout moving a lock bolt to a mechanical end position, which reduces wearof the electronic lock operating device significantly.

According to one embodiment the electronic door lock operating deviceis configured to communicate wirelessly with an electronic key.

The electronic door lock operating device thus enables a mechanicaldoor lock to be operated by an electronic lock device that communicates withthe electronic door lock operating device wirelessly using radiocommunication.

According to one embodiment the motor lock device is batterypowered.

According to one embodiment the coupling arrangement comprises aprimary coupling device, preferably in the form of an interference coupling,and a secondary coupling device, prefereably in the form of an interferencecoupling.

According to one embodiment at least one of the primary couplingdevice and the secondary coupling device comprises an interferencecoupling.

These and other aspects of the invention will be apparent from andelucidated with reference to the c|aims and the embodiments describedhereinafter.

Brief Description of the Drawinqs The invention will hereafter be described in more detail and withreference to the appended schematic drawings.

Fig. 1 is a perspective view of a door provided with an electronic doorlock operating device according to an embodiment of the present disclosure.

Fig. 2 is a perspective view and shows the door lock operating devicein Fig. 1.

Fig. 3 is an exploded perspective view and shows parts of the doorlock operating device in Fig. 1.

Figs. 4a-b are perspective views and show a coupling arrangement ofthe door lock operating device in Fig. 2 in a disengaged position.

Fig. 5 is a partly sectioned view of the coupling arrangement in Fig 4ain a disengaged position.

Figs. 6a-b are perspective views and illustrate the couplingarrangement in Fig. 4a during transition from a disengaged position to anengaged position.

Fig. 7 is a perspective view and shows the coupling arrangement inFig. 4a in an engaged position.

Detailed Description of Preferred Embodiments of the lnventionFig. 1 shows a door 1 provided with an electronic door lock operatingdevice 3 according to an embodiment of the present invention. The door 1, which may be a standard building door, is provided with a mechanical doorlock 5. The door lock operating device 3 is mounted to a lock case 7 of themechanical door lock 5 for operating a lock bolt 9 (or deadbolt) of the lock 5,i.e. for locking and unlocking the mechanical door lock 5. The lock case 7 is amechanical device that allows retraction and protrusion of the lock bolt 9. Acorresponding recess (not shown) is provided in an adjacent door frame foraccomodating the protruded lock bolt when the door is locked. The electronicdoor lock operating device 3 is configured to operate the door lock 5 bymoving the lock bolt 9 of the associated lock case 7 between a retractedposition corresponding to a door unlocked position and a protruded positioncorresponding to a door locked position.

Now referring to Fig. 2 the electronic door lock operating device 3comprises a housing 11, a turn knob 13, which is is operatively connected tothe lock bolt 9, and a base plate 15 to which the housing 11 and other parts ofthe electronic door lock operating device 3 is connected. The base plate 15comprises a connection portion 17 configured to engage the connectionportion of a mounting plate (not shown) secured to a door for mounting of theelectronic door lock operating device 3 to the door.

The electronic door lock operating device 3 further comprises anelectric motor 21, a coupling arrangement 23 and a lock bolt operatingmember 25.

The lock bolt operating member 25 is connected to a rotatable lockfollowing member 27 of the mechanical lock 5 by a bevel gear transmission29. The bevel gear transmission 29 is formed by a bevel gear 31 of the lockbolt operating member 25 and a bevel gear 33 of the lock following member27.

The rotatable lock following member 27 is fixedly connected to the tailpiece (not shown) of the door lock 5 in such a manner that by turning the lockfollowing member 27 the lock bolt 9 of the lock 5 is operated. Upon rotation ofthe lock following member 27 the lock bolt 9 thus moves in or out from thelock case 7.

The coupling arrangement 23 is arranged to connect the motor 21 tothe lock bolt operating member 25 for turning the lock bolt following member 27 via the transmission 29. The coupling arrangement 23 is thus arranged toconnect the motor 21 to the lock bolt operating member 25 for turning the lockbolt following member 27, thereby operating the lock bolt 9 of the door lock 5.The lock bolt operating member 25 is thus arranged to operate the lock bolt 9via the rotatable lock following member 27 when the motor 21 is connected tothe lock bolt operating member 25, i.e. when the coupling arrangement 23 isin the engaged position. The lock bolt 9 may be operated from a door lockedposition, in which the door lock 5 is locked, to a door unlocked position, inwhich the door lock 5 is unlocked, or from the door unlocked position to thedoor locked position, by the motor 21.

When the motor 21 is disconnected from the lock bolt operatingmember 25, i.e. when the coupling arrangement 23 is in an disengagedposition, the lock bolt operating member 25 may be operated manually byturning the lock knob 13 or using a mechanical key (not shown).

Now referring to Fig. 3 the coupling arrangement 23 comprises a firstcoupling member 35, which is fixedly connected to an output shaft 37 of themotor 21, a second coupling member 39, which is pivotally connected to themotor output shaft 37, a friction element, in the form of a magnet friction ring41, a biasing spring 43 and the lock bolt operating member 25 which ispivotally connected to the motor output shaft 37. An extended portion of themotor output shaft 37 thus forms a coupling shaft of the coupling arrangement23.

The second coupling member 39 comprises a first coupling portion 45which is configured to interact with a coupling portion 47 of the first couplingmember 35, thereby forming an interference coupling between the first andthe second coupling members 35, 39 together with the coupling portion 47 ofthe first coupling member 35. To this end the coupling portion 47 of the firstcoupling member 35 comprises two engagement projections 46, which areillustrated in Fig. 4b, extending in an axial direction, i.e. in a direction parallelto the motor output shaft 37 and the first coupling portion 45 of the secondcoupling member 39 comprises two axially extending engagement projections48.

The second coupling member 39 further comprises a second couplingportion 49 which is configured to interact with a coupling portion 51 of theoperating member 25, thereby forming an interference coupling between thesecond coupling member 39 and the operating member 25 together with theconnection portion 51 of the lock operating member 25. Each of the secondcoupling portion 49 of the second coupling member 39 and the couplingportion 51 of the operating member 25 comprises several axially extendingteeth 50, 52.

The coupling arrangement 23 thus comprises a primary couplingdevice 46, 48, in the form of a first inteference coupling, between the firstcoupling member 35 and the second coupling member 39 and a secondarycoupling device 50, 52, in the form of a second interference coupling,between the second coupling member 39 and the lock operating member 25.

Furthermore, the first coupling member 35 comprises a ramp surface53 facing the second coupling member 39 and the second coupling member39 comprises a ramp surface 55 facing the first coupling member 35. Theramp surfaces 53, 55 together form a ramp device 56 configured to move thesecond coupling member 39 axially along the coupling shaft 37 upon rotationof the first coupling member 35 relative to the second coupling member 39, aswill be described hereinafter with reference to Figs. 6a-b.

The magnetic friction ring 41 is connected to the second couplingmember 39 by means of two magnets, of which one 57 is shown in Fig. 3,received in magnet holders 59 formed in the second magnetic couplingmember 39. The magnetic friction ring 41 has a projecting portion 61 which isconfigured to be received in an elongated guide aperture 63 formed in thebase plate 15 of the lock operating device 3. The magnetic friction ring 41forms a guide element, which forms a guide device together with the guideaperture 63. The guide device 41, 61, 63 is configured to guide the secondcoupling member 39 axially during transition from a disengaged position to anengaged position.

The lock operating device 3 further comprises control electronics (notshown) and a linear position sensor (not shown), such as a an optical sensor,a hall effect sensor or a micro swith, for determining the axial position of the 11 second coupling member 39. Such a linear position sensor may be arrangedto determine the position of the projecting portion 61 of the guide element 41.

The lock operating device 3 further comprises a motion sensor 64,such as a pulse sensor or rotary encoder, connected to the output shaft 37 ofthe motor 21. The motion sensor 64 enables speed control of the motor 21.Furthermore, the motion sensor 64 enables the exact angular position of theshaft 37 to be determined whereby it is possible to determine if the door lock5 is in a locked state or in an unlocked state.

The electric motor 21 is powered by several batteries 65 disposed in abattery compartment 67 of the lock operating device 3.

Fig. 4a illustrates the coupling arrangement 23 in a disengaged state,i.e. in a state in which the motor 21 is disconnected from the lock operatingmember 25. ln this state the second coupling member 39 is biased to adisengaged position by the biasing spring 43. ln the disengaged position theteeth 50 of the second coupling member 39 and the teeth 52 of the operatingmember 25 are axially separated from each other, i.e. the engagementportions 50, 52 of the secondary coupling device are disconnected from eachother. The teeth 50 of the second coupling member 39 are thus held awayfrom engagement with the teeth 52 of the operating member 25 by the spring43. Also, in the disengaged position the engagement projections 46 of the firstcoupling member 35, which are illustrated in Fig. 4b, and the engagementprojections 48 of the second coupling member 39, which are also illustrated inFig. 4b, are rotationally separated from each other, i.e. the engagementportions 46, 48 of the primary coupling device are disconnected from eachother.

Fig. 4b shows the first coupling member 35, the second couplingmember 39 and the magnetic ring 41 separated from each other for thepurpose of illustration of features of the coupling arrangement 23. The rampsurfaces 53, 55, which are visible in Fig. 4b, are configured to, upon rotationof the first coupling member 35 relative to the second coupling member 39,move the second coupling member 39 axially from the disengaged position toan engaged position. 12 Now referring to Fig. 5, which also shows the coupling arrangement 23in a disengaged state, the biasing spring 43 is arranged between the secondcoupling member 39 and the lock operating member 25 and to bias thesecond coupling member 39 against the first coupling member 35, asillustrated by arrows in Fig. 5. ln the engaged position the biasing spring 43thus holds the teeth 50 of the second coupling member 39 and the teeth 52 ofthe operating member 25 at a distance from each other.

Figs. 6a-b illustrate transition of the coupling arrangement 23 from thedisengaged state to an engaged state, i.e. to a state in which the motor 21 isdrivingly connected to the operating member 25 so as to transfer rotationalmovement of the electric motor 21 to the lock operating member 25. Asdescribed hereinbefore the first coupling member 35 is fixedly connected tothe motor output shaft 37 and may thus be rotated by the motor 21. Uponrotation of the first coupling member 35, as illustrated by arrow A in Figs. 6a-b, the ramp device 56 forces the second coupling member 39 to move axially,as illustrated by arrow B in Fig. 6a, under the guidance of the guide device41, 61, 63.

Upon such rotation of the first coupling member 35 relative to thesecond coupling member 39 the engagement projections 46 of the firstcoupling member 35 are rotated into engagement with the engagementprojections 48 of the second coupling member 39, as illustrated by arrows Cin Fig. 6b. Furthermore, upon the axial movement of the second couplingmember 39, which is caused by the ramp device 56, the teeth 50 of thesecond coupling member 39 are moved into engagement with the teeth 52 ofthe lock operating member 25.

As mentioned hereinbefore the guide element 41 is magneticallyconnected to the second coupling member 39 and has a projecting portion 61received in a guide aperture 63. The magnetic ring 41 is thus prevented fromrotating by the projecting portion 61. The coupling force of the magneticcoupling between the element 41 and the second coupling member 39 isadapted to prevent the second coupling ring 39 from rotating with the firstcoupling member 35 until the engagement projections 46, 48 of the primarycoupling device are engaged to each other. 13 During transition from the disengaged state to the engaged state themagnetic friction element 41, which is magnetically connected to the firstcoupling member 35 thus guides the second coupling member 39 to moveaxially and thus prevents the second coupling member 39 from rotating withthe first coupling member 35 when the second coupling member 39 is in thedisengaged position.

Fig. 7 illustrates the coupling arrangement 23 in an engaged state, i.e.a state in which the motor 21 is drivingly connected to the operating member25 by the coupling arrangement. ln the engaged state the second couplingmember 39 is in an engaged position. ln the engaged position, theengagement projections 46, 48 of the primary coupling device are engagedwith each other and the teeth 50, 52 of the secondary coupling device areengaged with each other. Then, rotationa| movement is transferred from themotor 21 to the lock operating member 25 as the motor output shaft 37 isfurther rotated. Hence, upon continued rotation of the motor output shaft 37,i||ustrated by arrow D in Fig. 6, each of the second coupling member 39, thelock operating member 25, the lock following member 27 and the tail piece(not shown) is rotated, as i||ustrated by arrows E-H in Fig. 7. Then, the lockbolt 9 is operated by the motor 21 and may be moved from a retractedposition, in which the door lock 5 is in an unlocked state, to a protrudedposition in which the door lock 5 is in an unlocked state.

Upon rotation of the first coupling member 35 in an opposite directionthe second coupling member 39 is moved from the engaged position,i||ustrated in Fig. 7, to the disengaged position, i||ustrated in Fig. 4a. Hence,by performing a motion of the electric motor 21 in an opposite direction thesecond coupling member 39 is disconnected from engagement with the lockoperating member 25.

When the coupling arrangement is in the engaged position the electricmotor 21 is operatively connected to the lock bolt following member. A doorlocking operation, or a door unlocking operation, may then be performed bymeans of the motor 21. During a door locking operation, which involvesmovement of the lock bolt 9 from a retracted position to a protruded position,the motor output shaft 37 is rotated in one direction, and during a dunlocking 14 operation, which involves movement of the lock bolt 9 from a protrudedposition to a retracted position, the motor output shaft 37 is rotated in anopposite direction.

After a locking or unlocking operation, the second coupling member 39is free to return to a disengaged position. The second coupling member 39may, e.g., be moved from an engaged position to a disengaged state, therebydisconnecting the motor 21 from the lock bolt rotating member 25, byoperating the motor 21 in an opposite direction as described hereinbefore.The spring 43 maintains the second coupling member 39 in the disengagedposition until a locking or unlocking operation is initiated.

The linear position sensor (not shown) of the electronic door lockoperating device 3 enables the exact axial position of the second couplingmember 39 to be determined whereby it is possible to determine the exactaxial position of the second coupling member 39 upon engagement with thefirst coupling member 35, i.e. the axial position in which electric motor 21 isconnected to the lock bolt operating member 25.

Upon installation of the door lock operating device 3 the rotationalmovement of the lock following member 27 required to move the lock bolt 9from a retracted position corresponding to a door unlocked state to aprotruded position corresponding to a door locked state may be determinedand used to control the motor 21 in such a manner that the motor 21 isstopped just before the lock bolt 9 reaches a mechanical end position of thelock bolt. Hence, the motor 21 may be configured to, in a door lockingoperation, stop when the lock bolt 9 has been moved to an intermediate doorlocked position in which the lock bolt 9 protudes slightly less than in themechanical end position of the lock bolt arrangement but sufficiently tomaintain the door lock 5 in a door locked state. lt is realized by a person skilled in the art that features from variousembodiments disclosed herein may be combined with one another in order toprovide further alternative embodiments.

Claims

1. An electronic door lock operating device (3) configured to operate a doorlock (5) by moving a lock bolt (9) of an associated lock case (7), the device(3) comprising an electric motor (21 ), a lock bolt operating member (25), thelock bolt operating member (25) being connectable to a lock bolt followingmember (27) of a door lock (5), and a coupling arrangement (23) forconnecting the motor (21) to the lock bolt operating member (25),characterized inthat the coupling arrangement (23) comprises a first rotatable coupling member (35), which is fixedly connected to anoutput shaft (37) of the motor (21), a second rotatable coupling member (39), which is pivotally anddisplaceably connected to a shaft (37), the second coupling member (39)being axially movable between a disengaged position, to which it is biased, inwhich it is prevented from rotating relative to the first coupling member (35)and in which the motor (21) is disconnected from the lock bolt operatingmember (25), and an engaged position, in which the coupling arrangement(23) connects the motor (21) to the lock bolt operating member (25).

2. Electronic door lock operating device according to claim 1, wherein thecoupling arrangement (23) comprises a ramp device (56) configured to, uponrotation of the first coupling member (35) relative to the second couplingmember (39), move the second coupling member (39) from said disengagedposition to said engaged position.

3. Electronic door lock operating device according to any one of the precedingclaims, wherein the coupling arrangement (23) comprises a friction element(41) arranged to prevent the second coupling member (39) from rotating withthe first coupling member (35) when the second coupling member (39) is in adisengaged position. 16

4. Electronic door lock operating device according to any one of the precedingclaims, wherein the coupling arrangement (23) further comprises a guidedevice (41, 61, 63) adapted to guide the the second coupling member (39) tomove substantially axially along the shaft (37) of the coupling arrangement(23).

5. Electronic door lock operating device according to claim 4, wherein theguide device comprises a guide element (41) being connected to the secondcoupling member (39) and having a projecting portion (61), and a guideaperture (63) for receiving the projecting portion (61) of the guide element(41).

6. Electronic door lock operating device according to any one of the precedingclaims 4-5, wherein the guide element (41) is magnetically connected to thesecond coupling member (39).

7. Electronic door lock operating device according to any one of claims 4-6,wherein the guide element (41) is ring-shaped.

8. Electronic door lock operating device according to any one of the precedingclaims 4-7, further comprising a linear position sensor for determining theposition of the guide element (41 ).

9. Electronic door lock operating device according to claim 8, wherein thelinear position sensor comprises an optical sensor, a hall effect sensor or amicro switch.

10. Electronic door lock operating device according to any one of thepreceding claims 8-9, further comprising a motion sensor (64), such as apulse sensor or rotary encoder, for controlling the motor (21). 17

11. Electronic door lock operating device according to any one of thepreceding claims, wherein the electronic door lock operating device (3) isconfigured to communicate wirelessly with an electronic key.

12. Electronic door lock operating device according to any one of thepreceding claims, wherein the electrical motor (21) is battery powered.

13. Electronic door lock operating device according to any one of thepreceding claims, wherein the coupling arrangement (23) comprises aprimary coupling device (46,48) and a secondary coupling device (50, 52).

14. Electronic door lock operating device according to claim 13, wherein atleast one of the primary coupling device (46, 48) and the secondary couplingdevice (50, 52) comprises an interference coupling.