SE1950994A1 - An auxiliary latch bolt for installtion in a door lock arrangement - Google Patents

Abstract

An auxiliary latch bolt (800) is disclosed. The auxiliary latch bolt (800) is displaceable between a locking position (704, 706) and an unlocking position (702). A guiding unit (802) of the auxiliary latch bolt (800) is adapted to allow the rounded face (814) of the actuation unit (801) to abut against the guiding unit (802). A rounded face (814) is adapted to guide an actuation unit (801) of the auxiliary latch bolt (800) when the tip (810) is caused to move away from a secondary plane (61). The auxiliary latch bolt (800) is composed of only one actuation unit (801).

Description

AN AUXILIARY LATCH BOLT FOR INSTALLTION IN A DOOR LOCK ARRANGEMENT TECHNICAL FIELD The present invention relates to door lock arrangements for mounting in doors. Someembodiments of the present invention relate to electric door lock arrangements, such assolenoid lock arrangements, solenoid locks, electric locks or the like. ln particular, it is herein disclosed an auxiliary latch bolt for installation in a door lock arrangement.

BACKGROUNDDoor lock arrangements have a vast range of applications, such as at hotels, hospitals, offices or the like. For these applications, for example solenoid locks are particularly popular. Acommon type of solenoid locks is activated, e.g. unlocked, by means of a Radio FrequencyIdentification (RFID) tag, a magnetic card or the like. With a solenoid lock ofthis type, a lockingmechanism of the solenoid lock cannot be operated through actuation of a door handle unlessthe solenoid lock is electrically activated (Power-To-Open type locking arrangements). Somesolenoid locks allow the door handle to operate the locking mechanism without power and doinstead require power to deactivate the door handle, i.e. the door is locked when electricallyactivated (Power-To-Lock type locking arrangements). These door lock arrangements alsooften include a knob for manually locking and unlocking the door, where the knob is only mounted at one side of the door, or the door lock arrangement.

A general problem with known solenoid door lock arrangements is that a housingthereof comprises many different lever arms and pivoting bodies. This makes space availablefor electronics to control and/or monitor the solenoid door lock arrangement severely limited.ln future door lock arrangements, it is expected that further electronics will be built into thehousing, e.g. in order to allow for e.g. sensors to register positions of different moving internalmechanism of the solenoid arrangements.

EP1354113 discloses a solenoid arrangement for controlling handle operation in a doorlock, in which force transmission from an operation axis of a handle or the like to a followeracting on a bolt of the lock is arranged by means of a movable coupling member whichreceives its guidance from the solenoid arrangement. The arrangement includes a shaftelement which is arranged to move through a solenoid against the force of a spring and which moves a turnable lever member selecting the operating position of said coupling member. The position ofthe turning axis of the said lever member with regard to the coupling member isarranged to be selectively changed to provide a desired handle operation. The solenoidarrangement is further provided with a front plate through which a bolt of the lock is movable.A lock case of the solenoid arrangement is additionally provided with an operation axis, towhich a follower is installed. The follower is turnablyjournalled to the lock case and acts onthe bolt of the lock through a separate force transmission lever. A disadvantage is thus that space available for electronics is very limited.

For door lock arrangements, there exists a solution that enable a door lockarrangement to be adapted such that the door, in which the door lock arrangement isinstalled, can be opened from either side of the two sides ofthe door, such as the inside or theoutside of the door, merely by operating the handle, e.g. without using any existing electroniclocking functionality.

For example, EPO620341 discloses a device for adapting a panic-safe lock to theopening direction of a door, for pre-setting the lock to open only from one side and fortemporarily allowing to open it from the opposite side, comprising a pair of annular elementsrotatably supportable in the lock and having coaxial polygonal seats for the side-fittingengagement of a respective handle, and threaded coaxial holes parallel to the axis of the seats,the annular elements being able to rotate in contrast with elastic means from a fixedabutment position, a lever which is pivoted between the annular elements coaxiallytheretoand has a slot that can be aligned with the threaded holes and in which a screw is inserted, thescrew being screwed into one of the threaded holes and having such a length as to rotationallycouple the lever and the annular element in which the screw has been screwed, the otherannular element being free, the lever having a first arm for the actuation ofthe spring latch, asecond arm for the simultaneous actuation of the bolt, and a pawl actuatable by means ofthetumbler of a key-operated device and suitable to engage teeth ofthe annular elements toprovide a rotational coupling between the lever and the annular elements. A disadvantagewith this solution may be that there is a risk of losing the screw and that it, at times, may be time consuming and/or cumbersome to move the screw from one hole to another.

Furthermore, it is common to provide the door lock arrangement with a so calledauxiliary latch bolt. When a door, in which such door lock arrangement is installed, is closed, the auxiliary latch bolt is forced into the door lock arrangement. This causes a locking bolt, such as a dead bolt or a latch bolt, to be secured in its extracted position, i.e. it is preventedthat the locking bolt is pushed into the door lock arrangement. ln the extracted position, thelocking bolt projects through and away from a faceplate ofthe door lock arrangement. ln thismanner, an attempt to tamper with the locking bolt, e.g. by inserting a screw driver in a slitbetween the door and the door frame in order to push the locking bolt into the door lockarrangement to thereby be able to open the door, may be prevented.

A known auxiliary latch bolt comprises a main body adapted to guide two tiltablebarring bodies such that the auxiliary latch bolt moves away from and into the door lockarrangement when a tip of any one ofthe barring bodies is caused to tilt, e.g. due to closing ofa door in which the present door lock arrangement may be installed. Thanks to that the knownauxiliary latch bolt comprises two tiltable barring bodies, the door lock arrangement may beinstalled in a door with the hinges to the right or left as seen by an observer towards which thedoor opens. A disadvantage is that, once the door has been installed, only one of the tiltablebarring bodies will be in active use when the door closes. A further disadvantage with thisauxiliary latch bolt is that it is somewhat complex to manufacture.

Another known auxiliary latch bolt has only one barring body. The barring body isrigidly mounted on a transversally movable main body. The barring body is typically mountedwith a screw such that the barring body may be released and installed again, whereby theauxiliary latch bolt is adapted to left or right hinged doors. A few barring bodies are adapted tohandle both left and right hinged doors. A disadvantage with these known auxiliary latch boltsmay be that friction between a strike plate of a door frame, enclosing a door lock arrangementprovided with these known auxiliary latch bolts, and the rigidly mounted barring body may cause unnecessary wear and possibly also undesired sounds when the door is closed.

SUMMARYln view ofthe above, an object may be to alleviate or at least reduce one or more of the abovementioned disadvantages and/or problems.

This object, and other objects, may be achieved by the independent claims appended herewith.

According to an aspect, there is hence provided an auxiliary latch bolt for installation in a door lock arrangement, wherein the auxiliary latch bolt, when mounted in the door lock arrangement, is dísplaceable between a locking position and an unlocking position bytranslation thereof in parallel with a geometrical axis that is perpendicular to a main plane of afaceplate of the door lock arrangement.

Furthermore, the auxiliary latch bolt comprises a guiding unit adapted to guide theauxiliary latch bolt when being displaced between the locking position and the unlockingposition, The guiding unit is adapted to allow a bolt of the door lock arrangement to be locked ina projecting position, in which the bolt projects through the faceplate, when the auxiliary latchbolt is located in the locking position. The guiding unit is also adapted to allow the bolt to beretracted at least partly into an interior of the door lock arrangement, when the auxiliary latchbolt is located in the unlocking position.

The auxiliary latch bolt, when mounted in the door lock arrangement, projects less, ornot at all, through the faceplate in the locking position than in the unlocking position. Theauxiliary latch bolt, when mounted in the door lock arrangement, is spring biased towards theunlocking position.

The auxiliary latch bolt comprises an actuation unit comprising a wedge-shapedportion, having two side surfaces meeting at a tip ofthe wedge-shaped portion.

The guiding unit is adapted to guide the actuation unit when the tip is caused to moveaway from a secondary plane that is perpendicular to the main plane ofthe faceplate andparallel with a longitudinal axis ofthe faceplate, wherein the tip is located in the secondaryplane when the auxiliary latch bolt is in the unlocking position.

The actuation unit comprises a base portion having at least two supporting surfacesarranged to abut against the faceplate when the auxiliary latch bolt is located in the unlockingposition. The base portion has a rounded face adapted to the guiding unit.

The guiding unit is adapted to allow the rounded face of the actuation unit to abutagainst the guiding unit. The rounded face is further adapted to guide the actuation unit whenthe tip is caused to move away from the secondary plane, and the auxiliary latch bolt iscomposed of only one actuation unit.

Thanks to that the auxiliary latch bolt is composed of only one actuation unit thatabuts against the rounded face, the auxiliary latch bolt is easy to manufacture. A reason forthis is that the auxiliary latch bolt includes few parts that have rigid shapes in that the parts includes no complex projecting parts or otherwise convoluted shapes.

BRIEF DESCRIPTION OF THE DRAWINGS The various aspects of embodiments dísclosed herein, including particular features andadvantages thereof, are explained in the following detailed description and the accompanyingdrawings. The drawings are not to scale and any measures indicated are merely provided asexamples for ease of understanding.

Figure 1 is an overview illustrating a door in which an exemplifying door lockarrangement is installed.

Figure 2 is a side view illustrating the door lock arrangement with connecting leverspindles and lever handles.

Figure 3 includes three views illustrating the exemplifying door lock arrangement.

Figure 4 includes views illustrating features relating to the elongated guiding element.

Figure 5 illustrates an exemplifying gear arm according to some examples herein.

Figure 6 illustrates an exemplifying lock hub according to some examples herein.

Figure 7 is a cross-sectional view illustrating a printed circuit board mounted in theexemplifying door lock arrangement.

Figure 8 shows plan views illustrating difference between a known printed circuitboard and an exemplifying printed circuit board to be used with at least some embodimentsherein.

Figure 9 includes views illustrating an exemplifying hub arrangement according tosome examples herein.

Figure 10 includes views illustrating an exemplifying cam pin.

Figure 11 shows a set of views illustrating locking and unlocking positions ofanauxiliary latch bolt as well as an exploded view of some parts relating to the auxiliary latchbolt.

Figure 12 illustrates an exemplifying actuation unit ofthe auxiliary latch bolt.

Figure 13 is a perspective view illustrating an exemplifying locking member that isadapted to cooperate with the auxiliary latch bolt to achieve locking and unlocking of an exemplifying bolt.

DETAILED DESCRIPTIONFigure 1 illustrates a door lock arrangement 1 when installed, or mounted, in a doorleaf 2, or door for short.

To the left in Figure 1, illustrating a plan view of the door leaf Z, it is shown that the door lock arrangement 1 comprises a first hub 4 for receiving a lock lever (not shown) and asecond hub 6 for receiving a lever handle 8. The door leaf 2 is usually mounted in a door framevia hinges 9.

To the right in Figure 1, illustrating a cross-sectional view ofthe door leaf 2, it is shownthat the door leaf 2 may be provided with one handle at each side of the door leaf 2, i.e. a first handle 8a and a second handle 8b.

Turning to Figure 2, a more detailed cross-sectional view ofthe door lock arrangement1 is provided. As illustrated, the first hub 4 may be adapted to receive a lock actuator spindle202 that may be connected to a knob 204 for manually manoeuvring the door lockarrangement. By use of the knob 204, opening and/or closing of the door may be enabled.

Additionally, the second hub 6 is adapted to receive at least one of a first lever handlespindle 206 and a second lever handle spindle 208. ln turn, each of the first and second leverhandle spindles 206, 208 may be connected to a respective lever handle, such as the first and second handles 8a, 8b.

Figure 3 shows, in a cross-sectional view and two different perspective views asenumerated from the left to right, an exemplifying door lock arrangement 1 according to someembodiments herein. The exemplifying door lock arrangement 1 includes all aspects disclosedherein for reasons of simplicity. lt shall, however, be understood that the aspects disclosedherein may be implemented separately. Accordingly, there may be provided other door lock arrangements that include any one or more ofthe aspects of the present invention.

Generally, with reference to the cross-sectional view of Figure 3, the door lockarrangement 1 for mounting in the door leaf 2 comprises a faceplate 10 mountable in the doorleaf 2, and a mounting plate 12 adapted to be received by the door leaf 2. The faceplate 10comprises a first opening 52 adapted to receive an auxiliary latch bolt and a second opening 54 adapted to receive a bolt 18. The faceplate 10 and the mounting plate 12 forms a casing 14.

The casing 14 comprises a rotatable gear arm 16 adapted to translationally displacethe bolt 18 by rotation about a rotational axis 20 perpendicular to the mounting plate 12. Thebolt 18 may be a latch bolt, a dead bolt or the like depending on realization ofthe door lock arrangement 1. lt is well known that some door lock arrangements include one or more bolts selected from a group comprising at least a Iatch bolt, a dead bolt and the like.

Moreover, the casing 14 comprises a lock hub 22 adapted to receive a lock actuatorspindle 202 for manoeuvring the bolt 18. The lock hub 22 may typically connect to a knob formanually displacing the bolt 18, whereby opening ofthe door is possible in case being closedin the first place.

The casing 14 further comprises a hub arrangement 24 adapted to allow the bolt 18 tobe controlled by actuation of a lever handle spindle, such as the first and second lever handlespindles 206, 208 as shown in Figure 2. The lever handle spindle may have a square cross-section. Therefore, the hub arrangement 24 may be a square hub arrangement.

The hub arrangement 24 may comprise a rower 25 adapted to receive the lever handlespindle, and a lever hub 29 adapted to at least partially enclose and receive the rower 25. lnorder to cooperate well with the hub arrangement 24 the rower may comprise a square- shaped cavity for receiving the lever handle spindle. ln one exemplifying embodiment of the door lock arrangement 1 of Figure 3, thecasing 14 further comprises an elongated guiding element 26 that is displaceable between afirst position 401 and a second position 402 by translation thereof in a longitudinal direction406 ofthe elongated guiding element 26 as illustrated in Figure 4.

The elongated guiding element 26 is spring biased towards the first position 401 inwhich the bolt 18 protrudes out of the faceplate 10 by that the bolt 18 is spring biased. lnFigure 4, spring biasing towards the first position is achieved by a spring 405.

The elongated guiding element 26 is arranged to retract the bolt 18, when theelongated guiding element 26 is located in the second position 402.

Moreover, the elongated guiding element 26 comprises a lock actuation element 28 ata first end 411 thereof in proximity of the lock hub 22. The lock actuation element 28 isarranged to convert rotation ofthe lock hub 22 to a translational movement of the elongatedguiding element 26 from the first position 401, e.g. in a direction away from the first position.Preferably, a one-way conversion ofthe rotation of the loch hub 22 to translational movementof the elongated guiding element 26 is provided. ln this manner, the lock hub 22 is notnecessarily rotated when the elongated guiding element 26 is displaced from the first position 401 to the second position 402.

The elongated guiding element 26 comprises a bolt displacing element 30 at a middleportion 413 thereof in proximíty of the rotatíonal axis 20 ofthe gear arm 16, wherein the boltdisplacing element 30 is arranged to convert the translational movement ofthe elongatedguiding element 26 to a rotation of the gear arm 16.

The elongated guiding element 26 comprises a lever actuation element 32 at a secondend 412 thereof in proximíty ofthe hub arrangement 24, wherein the lever actuation element32 is arranged to convert rotation of the hub arrangement 24 to the translational movementofthe elongated guiding element 26.

The elongated guiding element 26 is displaceable along an interior face 34 of thecasing 14 in accordance with the translational movement, wherein the interior face 34 isopposite to the faceplate 10 of the door lock arrangement 1. The interior face 34 may beparallel with the faceplate 10. lt may be noted that the elongated guiding element 26 may abut directly to the lockhub 22 at the first end 411 of the elongated guiding element 26, abut directly to the hubarrangement 24 at the second end 412 of the elongated guiding element 26 and abut directlyto the gear arm 16 at the middle portion 413 of the elongated guiding element 26 between thefirst and second ends 411, 412. Typically, the gear arm 16 is adapted to displace the bolt 18 when rotated by translation of the elongated guiding element 26.

The elongated guiding element 26 may further be operable by means of actuation ofthe lever handle spindle 206, 208 and the lock actuator spindle 202 to be displaced betweenthe first and second positions 401, 402. Hence, in this manner, the elongated guiding elementmay be displaced between the first and second positions 401, 402 according to operation be e.g. a user, a human, a person or any one attempting to open and/or close the door.

The lock actuation element 28 may comprise a fork 420 adapted to be received by atleast one groove 850 ofthe lock hub 22 to convert the rotation of the lock hub 22 to thetranslational movement of the elongated guiding element 26. ln this manner, the rotation ofthe lock hub 22 is efficiently converted to the translational movement of the elongated guidingelement 26 while requiring a very limited amount of space in the casing 14. For example, therotation of the lock hub 22 does not cause arms or levers to rotate, which normally wouldrequire relatively large amounts of space within the casing 14. The fork 420 together with said at least one groove 850 of the lock hub 22 forms an exemplifying mechanism to achieve the abovementioned one-way Conversion.

The bolt displacing element 30 may comprise a projecting part 31 adapted to convertthe rotation ofthe hub arrangement 24 to the translational movement ofthe elongatedguiding element 26 to cause the bolt 18 to be retracted.

The lever actuation element 32 may comprise a first set of gear teeth 430 adapted tobe received by a second set of gear teeth 910 of the lever hub 29, as shown in more detail inFigure 9, to convert the rotation of the lever hub 29 to the translational movement oftheelongated guiding element 26. ln this manner, clockwise or counter-clockwise rotation of thelever hub 29 may be transferred to the translation ofthe elongated guiding element 26, whileonly requiring the lever hub 29 and the elongated guiding element 26 to connect, or abut, witheach other at one small section, e.g. 90 degrees or less, of an imaginary circle that is concentricwith a rotational axis of the lever hub 29.

As described above, this means that the elongated guiding element 26 is arranged tobe displaceable without rotation (from a first position 401) to a second position 402, in whichthe bolt 18 is retracted.

Again, the elongated guiding element 26 is arranged to be biased towards the firstposition 401 in which the lock hub 22 is in a first rotational hub position. When the lock hub 22is rotated, e.g. by means of a knob, the lock hub 22 leaves the first rotational hub position,counter-clockwise or clockwise, while the elongated guiding element 26 at the same time isforced to leave its first biased position 401.

The lock hub 22 is connected to the guiding element 26 to provide a one-wayconversion of spindle rotation to translational movement of the elongated guiding element, e.g. thanks to the aforementioned fork as an exemplifying realization.

Figure 5 illustrates the gear arm 16 according to an exemplifying realization. A leverportion 550 of the gear arm 16 is spaced away from the mounting plate in order to allow theprinted circuit board to fit under the lever portion 550. The gear arm 16 comprises a projection552 projecting from a cylindrical housing 554 enclosing the rotational axis 20 (shown in Figure3) of the gear arm 16.

At a distal portion 556 of the gear arm 16, a preventing surface 558 is adapted toprevent that the bolt is locked in the extracted position when the elongated guiding element 26 is displaced towards its second position 402.

Figure 6 illustrates the lock hub 22 according to an exemplífying realízation. ln thisexample, the groove 850 extends along somewhat more than half of the circumference ofthelock hub 22. Notably, the lock hub 22 comprises two abutting surfaces 852, 854, which areadapted to cause the elongated guiding element 26 to be displaced from its first position 401 when desired.

Figure 7 illustrates an exemplífying printed circuit board 752 which takes advantage ofthe space made available, amongst others thanks to the elongated guiding element 26. Other shapes of the exemplífying printed circuit board may be contemplated by the skilled person.

Figure 8 shows two plan views, to the left one of a known printed circuit board 754using the space available in a known door lock arrangement, and to the right the printed circuit 752 board of Figure 7.

Figure 9 illustrates in more detail an exemplífying hub arrangement 24. ln thisexample, the hub arrangement 24 comprises a cam pin 510, which may be rotated between atleast a first rotational position and a second rotational position to selectively cause either ofthe first or second lever handle 8a, 8b to be operational for opening of the door 2.

Hence, according to another aspect, there may be provided a door lock arrangement 1for installation in a door leaf 2. Again, the door lock arrangement 1 comprises a mounting plate12 adapted to be received bythe door leaf 2.

The mounting plate 12 supports, or upholds, a hub arrangement 24.

The hub arrangement 24 is adapted to selectably control whether a bolt is retracted ornot upon on actuation of at least one ofa first lever handle 8a and a second lever handle 8b,mountable at a first side 5 of the door leaf 2 and a second side 7 ofthe door leaf 2,respectively.

The hub arrangement 24 further comprises a first rower 25a, wherein the secondengaging arm 504 is biased to disengage the second distal end 506 from the second rower 25badapted to receive a first lever handle spindle, connectable to the first lever handle 8a, fromthe first side ofthe door leaf 2, and a second rower 25b adapted to receive a second leverhandle spindle, connectable to the second lever handle 8b, from the second side of the doorleaf 2.

Moreover, the hub arrangement 24 comprises a lever hub 29 adapted to at least 11 partially enclose and receive the first and second rowers 25a, 25b.

Fírstly, the hub arrangement 24 further comprises a first engaging arm 501 having afirst proximal end 502 and a first distal end 503, wherein the first engaging arm 501 is biasedto keep the first distal end 503 spaced apart from the first rower 25a, wherein the firstproximal end 502 is rotatably mounted at a first face of the lever hub 29, wherein the first facefaces the first side ofthe door leaf 2, wherein the first distal end 503 and the first rower 25aare adapted to cause, when abutting against each other, the lever hub 29 to rotate when thefirst rower 25a is rotated while allowing the lever hub 29 to rotate while not causing the firstrower 25a to rotate.

Secondly, the hub arrangement 24 further comprises a second engaging arm 504having a second proximal end 505 and a second distal end 506, wherein the second engagingarm 504 is biased to keep the second distal end 506 spaced apart from the second rower 25b,wherein the second proximal end 505 is rotatably mounted at a second face of the lever hub29, wherein the second face faces the second side ofthe door leaf 2, wherein the second distalend 506 and the second rower 25b are adapted to cause, when abutting against each other,the lever hub 29 to rotate when the second rower 25b is rotated while allowing the lever hub 29 to rotate while not causing the second rower 25b to rotate.

Returning to the cam pin 510, the lever hub 29 comprises a through hole in which thecam pin 510 is rotatably installed.

The cam pin 510 is rotatable about a longitudínal axis thereof between at least a firstrotational position and a second rotational position. A difference in rotation between the firstand second rotational positions may be 90 degrees, 180 degrees or another suitable value. Anadvantage with 90 degrees compared to 180 degrees may be that the cam pin 510 need berotated less to change which lever handle that active, i.e. effective for causing the retraction of the bolt.

As shown in Figure 10, the cam pin 510 has a first end 602 in the vicinity of the firstengaging arm 501 and a second end 610 in the vicinity of the second engaging arm 504,wherein the first end 602 comprises a first forcing surface 604 and a first allowing surface 606,wherein the second end 610 comprises a second forcing surface 612 and a second allowingsurface 614.

When the cam pin 510 is in the first rotational position, the first forcing surface 604 is 12 adapted to abut against the first proximal end 502 to force the first distal end 503, against biasofthe first engaging arm 501, to abut against the first rower 25a. Moreover, when the cam pin510 is in the first rotational position, the second allowing surface 614 is adapted to allow thesecond distal end 506 to be spaced apart from the second rower 25b according to bias of thesecond engaging arm 504.When the cam pin 510 is in the second rotational position, the first allowing surface 606 is adapted to allow the first distal end 503 to be spaced apart from the first rower 25aaccording to bias ofthe first engaging arm 501. Furthermore, when the cam pin 510 is in thesecond rotational position, the second forcing surface 612 is adapted to abut against thesecond proximal end 505 to force the second distal end 506, against bias ofthe second engaging arm 504, to abut against the second rower 25b.

The mounting plate 12 may preferably comprise an opening 50 adapted to reveal abutt 620, provided at the second end 610 ofthe cam pin 510, that is adapted to allow the campin 510 to be rotated by engagement with the butt 620. ln this manner, the cam pin 510 may be rotated while the hub arrangement 24 remains installed at the mounting plate 12. ln some embodiments, the door lock arrangement 1 may be an electric door lockarrangement 1. ln these embodiments, the mounting plate 12 may hold an electricallyactivatable moving member 40 having a displaceable element 42 that is displaceable betweenan engaging position and a non-engaging position based on electrical activation of theelectrically activatable moving member 40. The electrically activatable moving member may bea solenoid, an electric motor or the like. The displaceable element 42 ensures that both thefirst and second engaging arms 501, 504 are engaged with the first and second rowers 25a,25b, respectively, when the displaceable element 42 is in the engaging position and whereinthe displaceable element 42 allows both the first and second engaging arms 501, 504 todisengage with the first and second rowers 25a, 25b, respectively, when the displaceableelement 42 is in the non-engaging position.lt may here be noted that according to prior art, a solenoid always activates both arms, i.e. there is no means to against the bias of the arm to force the arm to always be engagedwith the respective rower, e.g. the first and/or second rower 25a, 25b. An idea ofthe cam pinis thus that the cam pin by rotation exposes different sides, or faces, thereof to the first and second engaging arms 501, 504 at the first and second ends 602, 610, respectively. 13 Therefore, the_fírst forcing surface 604 and the second forcing surface 612 may havemany different shapes that may suitably achieve that the first and/or second engaging arms501, 504 becomes engaged against their biases. For example, the first and second forcingsurfaces 604, 612 may be convex, protruding or the like. Similarly, the first and secondallowing surfaces 606, 614 may have many different shapes that may suitably achieve that thefirst and/ second engaging arms 501, 504 are allowed to be spaced apart from its respectiverower 25a, 25b. For example, the first and second allowing surfaces 606, 614 may be concave, formed as a recess or the like.

The lever hub 29 may have a throughbore that emanates from the through hole andthat is perpendicular to the through hole, wherein a ball spring plunger 520 is installed in thethroughbore to secure the cam pin 510. As a result, rotation ofthe cam pin 510 is made inert to avoid unintentional rotation thereof. ln some embodíments, the cam pin 510 is rotatable about the longitudinal axis thereofbetween at least the first and second rotational positions and a third rotational position. lnthese embodíments, the first end 602 comprises a further first allowing surface 607, and thesecond end 610 comprises a further second allowing surface 615. Additionally, when the campin 510 is in the third rotational position, the first further allowing surface 607 is adapted toallow the first distal end 503 to be spaced apart from the first rower 25a according to bias ofthe first engaging arm 501. This further means that, when the cam pin 510 is in the thirdrotational position, both the first forcing surface 604 and the first allowing surface 606 aredirected towards other direction than the first rower 25a.

When the cam pin 510 is in the third rotational position, the second further allowingsurface 615 is adapted to allow the second distal end 506 to be spaced apart from the secondrower 25b according to bias of the second engaging arm 504. This further means that, whenthe cam pin 510 is in the third rotational position, both the second forcing surface 612 and thesecond allowing surface 614 are directed towards other direction than the first rower 25a.

As illustrated by the dotted lines of the cross-sectional views ofthe first and secondends 602, 610 of the cam pin 510 in the upper portion of Figure 10, the first and the furtherfirst allowing surfaces 606, 607 and the second and the further second allowing surface 614,614 may be different portions of a respective common surface.

According to the embodiment of Figure 10, the rotational difference between the first 14 and second rotational positions is 180 degrees, and the third rotational position may belocated between the first and second rotational positions, e.g. at 90 degrees. Other embodiments may have different values of the angle for rotational difference. ln Figure 11, a further aspect ofthe present invention is illustrated. Three portions ofFigure 11 illustrate Iocking and unlocking positions of an exemplifying auxiliary latch bolt 800for installation in a door lock arrangement, such as the one described above or similar doorlock arrangement.

The auxiliary latch bolt 800, when mounted in the door lock arrangement 1, isdisplaceable between a Iocking position 704, 706 and an unlocking position 702 by translationthereof in parallel with a geometrical axis 63 that is perpendicular to a main plane 60 ofafaceplate 10 of the door lock arrangement 1.

The auxiliary latch bolt 800 comprises a guiding unit 802 adapted to guide the auxiliarylatch bolt 800 when being displaced between the Iocking position 704, 706 and the unlockingposition 702.

The guiding unit 802 is adapted to allow a bolt 18 of the door lock arrangement 1 to belocked in a projecting position, in which the bolt projects through the faceplate 10, when theauxiliary latch bolt 800 is located in the Iocking position 704, 706. The bolt 18 is allowed to,unless locked by the auxiliary latch bolt 800, be retracted while being biased to be extractedthrough the faceplate 10.

The guiding unit 802 is adapted to allow the bolt to be retracted at least partly into aninterior of the door lock arrangement 1, when the auxiliary latch bolt 800 is located in theunlocking position 702.

The auxiliary latch bolt 800, when mounted in the door lock arrangement 1, projectsless, or not at all, through the faceplate 10 in the Iocking position 704, 706 than in theunlocking position 702.

The auxiliary latch bolt 800, when mounted in the door lock arrangement 1, is springbiased towards the unlocking position 702.

The auxiliary latch bolt 800 comprises an actuation unit 801 comprising a wedge-shaped portion 804, having two side surfaces 806, 808 meeting at a tip 810 of the wedge-shaped portion 804.

The guiding unit 802 is adapted to guide the actuation unit 801 when the tip is caused to move away from a secondary plane 61 that is perpendicular to the main plane 60 of the faceplate 10 and parallel with a longitudinal axis 62 of the faceplate 10, whereín the tip 810 islocated in the secondary plane 61 when the auxiliary Iatch bolt 800 is in the unlocking position702.

The actuation unit 801 comprises a base portion 812 having at least two supportingsurfaces 816, 818 arranged to abut against the faceplate 10 when the auxiliary Iatch bolt 800 islocated in the unlocking position 702. The wedge-shaped portion 804 typically projects fromand tapers in a direction away from said at least two supporting surfaces 816, 818.

The base portion 812 has a rounded face 814 adapted to the guiding unit 802. Thebase portion 812 may thus be formed as a cylindric segment, a box with heavily rounded corners or the like. ln particular, the guiding unit 802 is adapted to allow the rounded face 814 oftheactuation unit 801 to abut against the guiding unit 802. The rounded face 814 is furtheradapted to guide the actuation unit 801 when the tip 810 is caused to move away from thesecondary plane 61. This means that a portion of the guiding unit 802 towards the actuation unit 801 may be concave and formed as an inner surface 803 of a cylindric segment.

Furthermore, the auxiliary Iatch bolt 800 is composed of only one actuation unit 801.Since there is only one actuation unit 801, there is e.g. less risk ofthat dirt or other debris maycause the actuation unit 801 to malfunction. With two actuation units, as in the prior art,debris may get stuck between the two moving and tilting actuation units and cause malfunction ofthe auxiliary Iatch bolt 800.

The actuation unit 801 may preferably be symmetric with respect to the secondaryplane 61, being centrally located with respect to the faceplate 10. ln this manner, the auxiliaryIatch bolt 800 may be equally well adapted for a right-hand opened door or a left-hand opened door.

An angle between the secondary plane 61 and the side surfaces 806, 808 may bebetween 20 and 60 degrees, more preferably between 25 and 40 degrees. By adjusting themagnitude of the angle, the displacement of the auxiliary Iatch bolt 800 into the interior of thedoor lock arrangement 1. E.g. the lesser the angle, the larger the displacement into the interior ofthe door lock arrangement 1. The angle may also depend on a depth of the faceplate, where 16 the depth is measured perpendicularly to the secondary plane 61.

Figure 12 illustrates a series of views illustrating the exemplifying auxiliary latch bolt800. ln this exemplary embodiment of the actuation unit 801, the aforementioned angle isabout 28 degrees, e.g. +/- two degrees.

Said at least two supporting surfaces 816, 818 may be one and the same surface, orthey may be separated by e.g. a groove 817 or other indentation. An idea of said at least twosupporting surfaces 816, 818 is that the actuation unit 801 of the auxiliary latch bolt 800 iscaused to rotate about one of said at least two supporting surfaces 816, 818 when being displaced in a secondary direction perpendicular to the secondary plane 61.

Figure 13 shows an exemplifying locking member 13 that is adapted to cooperate withthe auxiliary latch bolt 800 to achieve locking and unlocking of an exemplifying bolt, such asthe bolt 18.

The locking member 13 has a hook portion 1010 adapted to engage with the bolt,whereby the bolt is prevented from being further retracted into the casing 14. Moreover, thelocking member 13 has a protruding locking support 1020 adapted to engage with the guidingunit 802 when the auxiliary latch bolt 800 is in the unlocking position 702. Furthermore, thelocking member 13 is biased to rotate such that the hook portion 1010 engages with the bolt unless the locking member 13 is inhibited by e.g. the gear arm 16.

As used herein, the term ”bias”, ”biased”, ”biasing” or the like may refer to mechanicalbiasing by means of a spring, a plate spring or the like.

Each embodiment, example or feature disclosed herein may, when physically possible,be combined with one or more other embodiments, examples, or features disclosed herein.

Even though embodiments ofthe various aspects have been described above, manydifferent alterations, modifications and the like thereof will become apparent for those skilledin the art. The described embodiments are therefore not intended to limit the scope of the present disclosure.

Claims (5)

17

1. CLAIIVIS1. An auxiliary latch bolt (800) for installation in a door lock arrangement (1), wherein theauxiliary latch bolt (800), when mounted in the door lock arrangement (1), is displaceablebetween a locking position (704, 706) and an unlocking position (702) by translation thereof inparallel with a geometrical axis (63) that is perpendicular to a main plane (60) of a faceplate(10) ofthe door lock arrangement (1), wherein the auxiliary latch bolt (800) comprises a guiding unit (802) adapted to guide theauxiliary latch bolt (800) when being displaced between the locking position (704, 706) and theunlocking position (702), wherein the guiding unit (802) is adapted to allow a bolt of the door lock arrangement (1)to be locked in a projecting position, in which the bolt projects through the faceplate (10),when the auxiliary latch bolt (800) is located in the locking position (704, 706), wherein the guiding unit (802) is adapted to allow the bolt to be retracted at least partlyinto an interior ofthe door lock arrangement (1), when the auxiliary latch bolt (800) is locatedin the unlocking position (702), wherein the auxiliary latch bolt (800), when mounted in the door lock arrangement (1),projects less, or not at all, through the faceplate (10) in the locking position (704, 706) than inthe unlocking position (702), wherein the auxiliary latch bolt (800), when mounted in the door lock arrangement (1), isspring biased towards the unlocking position (702), whereín the auxiliary latch bolt (800) comprises an actuation unit (801) comprising awedge-shaped portion (804), having two side surfaces (806, 808) meeting at a tip (810) ofthewedge-shaped portion (804), wherein the guiding unit (802) is adapted to guide the actuation unit (801) when the tip iscaused to move away from a secondary plane (61) that is perpendicular to the main plane (60)ofthe faceplate (10) and parallel with a longitudinal axis (62) of the faceplate (10), wherein thetip (810) is located in the secondary plane (61) when the auxiliary latch bolt (800) is in theunlocking position (702), wherein the actuation unit (801) comprises a base portion (812) having at least twosupporting surfaces (816, 818) arranged to abut against the faceplate (10) when the auxiliarylatch bolt (800) is located in the unlocking position (702), wherein the base portion (812) has a rounded face (814) adapted to the guiding unit (802), wherein the auxiliary latch bolt (800) is characterized in that 18 the guiding unit (802) is adapted to allow the rounded face (814) of the actuation unit(801) to abut against the guiding unit (802), wherein the rounded face (814) that is adapted toguide the actuation unit (801) when the tip (810) is caused to move away from the secondary plane (61), and that the auxiliary latch bolt (800) is composed of only one actuation unit (801).

2. The auxiliary latch bolt (800) according to claim 1, wherein the actuation unit (801) issymmetric with respect to the secondary plane (61), being centrally located with respect to the faceplate (10).

3. The auxiliary latch bolt (800) according to any one of claims 1-2, wherein the base portion (812) is formed as a cylindric segment.

4. The auxiliary latch bolt (800) according to any one of claims 1-3, wherein an anglebetween the secondary plane (61) and the side surfaces (806, 808) is between 20 and 60 degrees (to be verified by inventors).

5. The auxiliary latch bolt (800) according to any one of claims 1-4, wherein the wedge-shaped portion (804) projects from and tapers in a direction away from said at least two supporting surfaces (816, 818).