SE543473C2 - An auxiliary latch bolt for installation 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 INSTALLfÉgTION IN A DOOR LOCK ARRANGEl\/IENT 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 as solenoidlock 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.

BACKGROUND Door lock arrangements have a vast range of applications, such as at hotels, hospitals, officesor the like. For these applications, for example solenoid locks are particularly popular. A commontype of solenoid locks is activated, e.g. unlocked, by means of a Radio Frequency Identification (RFID)tag, a magnetic card or the like. With a solenoid lock of this type, a locking mechanism of thesolenoid lock cannot be operated through actuation of a door handle unless the solenoid lock iselectrically activated (Power-To-Open type locking arrangements). Some solenoid locks allow thedoor handle to operate the locking mechanism without power and do instead require power todeactivate the door handle, i.e. the door is locked when electrically activated (Power-To-Lock typelocking arrangements). These door lock arrangements also often include a knob for manually lockingand 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 housing thereofcomprises many different lever arms and pivoting bodies. This makes space available for electronicsto control and/or monitor the solenoid door lock arrangement severely limited. ln future door lockarrangements, it is expected that further electronics will be built into the housing, e.g. in order toallow for e.g. sensors to register positions of different moving internal mechanism of the solenoidarrangements.

EP1354113 discloses a solenoid arrangement for controlling handle operation in a door lock,in which force transmission from an operation axis of a handle or the like to a follower acting on abolt of the lock is arranged by means of a movable coupling member which receives its guidancefrom the solenoid arrangement. The arrangement includes a shaft element which is arranged tomove through a solenoid against the force of a spring and which moves a turnable lever memberselecting the operating position of said coupling member. The position of the turning axis of the saidlever member with regard to the coupling member is arranged to be selectively changed to provide a desired handle operation. The solenoid arrangement 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 providedwith an operation axis, to which a follower is installed. The follower is turnablyjournalled to the lockcase and acts on the 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 lock arrangement tobe adapted such that the door, in which the door lock arrangement is installed, can be opened fromeither side of the two sides of the door, such as the inside or the outside of the door, merely byoperating the handle, e.g. without using any existing electronic locking functionality.

For example, EP0620341 discloses a device for adapting a panic-safe lock to the openingdirection of a door, for pre-setting the lock to open only from one side and for temporarily allowingto open it from the opposite side, comprising a pair of annular elements rotatably supportable in thelock and having coaxial polygonal seats for the side-fitting engagement of a respective handle, andthreaded coaxial holes parallel to the axis of the seats, the annular elements being able to rotate incontrast with elastic means from a fixed abutment position, a lever which is pivoted between theannular elements coaxially thereto and has a slot that can be aligned with the threaded holes and inwhich a screw is inserted, the screw being screwed into one of the threaded holes and having such alength as to rotationally couple the lever and the annular element in which the screw has beenscrewed, the other annular element being free, the lever having a first arm for the actuation of thespring latch, a second arm for the simultaneous actuation of the bolt, and a pawl actuatable bymeans of the tumbler of a key-operated device and suitable to engage teeth of the annular elementsto provide a rotational coupling between the lever and the annular elements. A disadvantage withthis 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 called auxiliarylatch bolt. When a door, in which such door lock arrangement is installed, is closed, the auxiliarylatch bolt is forced into the door lock arrangement. This causes a locking bolt, such as a dead bolt ora latch bolt, to be secured in its extracted position, i.e. it is prevented that the locking bolt is pushedinto the door lock arrangement. ln the extracted position, the locking bolt projects through and awayfrom a faceplate of the door lock arrangement. ln this manner, an attempt to tamper with thelocking bolt, e.g. by inserting a screw driver in a slit between the door and the door frame in order topush the locking bolt into the door lock arrangement to thereby be able to open the door, may beprevented.

A known auxiliary latch bolt comprises a main body adapted to guide two tiltable barring bodies such that the auxiliary latch bolt moves away from and into the door lock arrangement whena tip of any one of the barring bodies is caused to tilt, e.g. due to closing of a door in which thepresent door lock arrangement may be installed. Thanks to that the known auxiliary latch boltcomprises two tiltable barring bodies, the door lock arrangement may be installed in a door with thehinges to the right or left as seen by an observer towards which the door opens. A disadvantage isthat, once the door has been installed, only one of the tiltable barring bodies will be in active usewhen the door closes. A further disadvantage with this auxiliary latch bolt is that it is somewhatcomplex to manufacture.

Another known auxiliary latch bolt has only one barring body. The barring body is rigidlymounted on a transversally movable main body. The barring body is typically mounted with a screwsuch that the barring body may be released and installed again, whereby the auxiliary latch bolt isadapted to left or right hinged doors. A few barring bodies are adapted to handle both left and righthinged doors. A disadvantage with these known auxiliary latch bolts may be that friction between astrike plate of a door frame, enclosing a door lock arrangement provided with these known auxiliarylatch bolts, and the rigidly mounted barring body may cause unnecessary wear and possibly also undesired sounds when the door is closed.

SUMMARYln view of the 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 adoor lock arrangement, wherein the auxiliary latch bolt, when mounted in the door lockarrangement, is displaceable between a locking position and an unlocking position by translationthereof in parallel with a geometrical axis that is perpendicular to a main plane of a faceplate of thedoor lock arrangement.

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

The auxiliary latch bolt, when mounted in the door lock arrangement, projects less, or not atall, through the faceplate in the locking position than in the unlocking position. The auxiliary latchbolt, when mounted in the door lock arrangement, is spring biased towards the unlocking position.

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

The guiding unit is adapted to guide the actuation unit when the tip is caused to move awayfrom a secondary plane that is perpendicular to the main plane of the faceplate and parallel with alongitudinal axis of the faceplate, wherein the tip is located in the secondary plane when the auxiliarylatch bolt is in the unlocking position.

The actuation unit comprises a base portion having at least two supporting surfaces arranged to abut against the faceplate when the auxiliary latch bolt is located in the unlocking position. 1 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 abut againstthe guiding unit. The rounded face is further adapted to guide the actuation unit when the tip iscaused to move away from the secondary plane, and the auxiliary latch bolt is composed of only one - - .\ .. _. .rxa . ._ .mig _. ;~. .\_. .___ ._.~. u: . . _. .. -.. :_ ._ _ . _: c. w. _. _.~ _ _ _ ,aCtuatlOn Unit. .H L}'Q:“E::_.~l: C-š LPG ègšzikššfiëï :Afinï ušïx-ašixšš. ESS àkfzucušíšxšš: 'uEEEL =í> “\.:.>l:x..~:š\-':? SNC! MN =ïïaïxš såå. å? T _ .~Ä. _. . i . ...Åïßfifiß . . _ . _ \t -. ¿ -. z-.iu -«._ .s >_~ . . y ..~»». .ß-.z- '~ \ > \šfifiè: gu: mätas.. v? e: »vännen m. gcrhMtizï.

Thanks to that the auxiliary latch bolt is composed of only one actuation unit that abutsagainst the rounded face, the auxiliary latch bolt is easy to manufacture. A reason for this is that theauxiliary 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 disclosed 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 lock arrangement isinstalled.

Figure 2 is a side view illustrating the door lock arrangement with connecting lever spindlesand 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 circuit board andan exemplifying printed circuit board to be used with at least some embodiments herein.

Figure 9 includes views illustrating an exemplifying hub arrangement according to someexamples herein.

Figure 10 includes views illustrating an exemplifying cam pin.

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

Figure 12 illustrates an exemplifying actuation unit of the auxiliary latch bolt.

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

DETAILED DESCRIPTION Figure 1 illustrates a door lock arrangement 1 when installed, or mounted, in a door leaf 2, ordoor for short.

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

To the right in Figure 1, illustrating a cross-sectional view of the door leaf 2, it is shown thatthe 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 of the door lock arrangement 1 isprovided. As illustrated, the first hub 4 may be adapted to receive a lock actuator spindle 202 thatmay be connected to a knob 204 for manually manoeuvring the door lock arrangement. By use of theknob 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 lever handlespindles 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 as enumeratedfrom the left to right, an exemplifying door lock arrangement 1 according to some embodimentsherein. The exemplifying door lock arrangement 1 includes all aspects disclosed herein for reasons ofsimplicity. lt shall, however, be understood that the aspects disclosed herein may be implementedseparately. Accordingly, there may be provided other door lock arrangements that include any one or more of the aspects of the present invention.

Generally, with reference to the cross-sectional view of Figure 3, the door lock arrangement1 for mounting in the door leaf 2 comprises a faceplate 10 mountable in the door leaf 2, and amounting plate 12 adapted to be received by the door leaf 2. The faceplate 10 comprises a firstopening 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 displace the bolt18 by rotation about a rotational axis 20 perpendicular to the mounting plate 12. The bolt 18 may bea latch bolt, a dead bolt or the like depending on realization of the door lock arrangement 1. lt is wellknown that some door lock arrangements include one or more bolts selected from a group comprising at least a latch bolt, a dead bolt and the like.

Moreover, the casing 14 comprises a lock hub 22 adapted to receive a lock actuator spindle202 for manoeuvring the bolt 18. The lock hub 22 may typically connect to a knob for manuallydisplacing the bolt 18, whereby opening of the door is possible in case being closed in the first place.

The casing 14 further comprises a hub arrangement 24 adapted to allow the bolt 18 to becontrolled by actuation of a lever handle spindle, such as the first and second lever handle spindles206, 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. ln order tocooperate 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, the casing 14further comprises an elongated guiding element 26 that is displaceable between a first position 401and a second position 402 by translation thereof in a longitudinal direction 406 of the elongated guiding element 26 as illustrated in Figure 4.

The elongated guiding element 26 is spring biased towards the first position 401 in which thebolt 18 protrudes out of the faceplate 10 by that the bolt 18 is spring biased. ln Figure 4, springbiasing towards the first position is achieved by a spring 405.

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

Moreover, the elongated guiding element 26 comprises a lock actuation element 28 at a firstend 411 thereof in proximity of the lock hub 22. The lock actuation element 28 is arranged to convertrotation of the lock hub 22 to a translational movement of the elongated guiding element 26 fromthe first position 401, e.g. in a direction away from the first position. Preferably, a one-wayconversion of the rotation of the loch hub 22 to translational movement of the elongated guidingelement 26 is provided. ln this manner, the lock hub 22 is not necessarily 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 middle portion413 thereof in proximity of the rotational axis 20 of the gear arm 16, wherein the bolt displacingelement 30 is arranged to convert the translational movement of the elongated guiding element 26to a rotation of the gear arm 16.

The elongated guiding element 26 comprises a lever actuation element 32 at a second end412 thereof in proximity of the hub arrangement 24, wherein the lever actuation element 32 isarranged to convert rotation of the hub arrangement 24 to the translational movement of theelongated guiding element 26.

The elongated guiding element 26 is displaceable along an interior face 34 of the casing 14 inaccordance with the translational movement, wherein the interior face 34 is opposite to thefaceplate 10 of the door lock arrangement 1. The interior face 34 may be parallel with the faceplate10. lt may be noted that the elongated guiding element 26 may abut directly to the lock hub 22at the first end 411 of the elongated guiding element 26, abut directly to the hub arrangement 24 atthe second end 412 of the elongated guiding element 26 and abut directly to the gear arm 16 at themiddle portion 413 of the elongated guiding element 26 between the first 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 of thelever handle spindle 206, 208 and the lock actuator spindle 202 to be displaced between the first and second positions 401, 402. Hence, in this manner, the elongated guiding element may 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 at leastone groove 850 of the lock hub 22 to convert the rotation of the lock hub 22 to the translationalmovement of the elongated guiding element 26. ln this manner, the rotation of the lock hub 22 isefficiently converted to the translational movement of the elongated guiding element 26 whilerequiring a very limited amount of space in the casing 14. For example, the rotation of the lock hub22 does not cause arms or levers to rotate, which normally would require relatively large amounts ofspace within the casing 14. The fork 420 together with said at least one groove 850 of the lock hub22 forms an exemplifying mechanism to achieve the abovementioned one-way conversion.

The bolt displacing element 30 may comprise a projecting part 31 adapted to convert therotation of the hub arrangement 24 to the translational movement of the elongated guiding element26 to cause the bolt 18 to be retracted.

The lever actuation element 32 may comprise a first set of gear teeth 430 adapted to bereceived by a second set of gear teeth 910 of the lever hub 29, as shown in more detail in Figure 9, toconvert the rotation of the lever hub 29 to the translational movement of the elongated guidingelement 26. ln this manner, clockwise or counter-clockwise rotation of the lever hub 29 may betransferred to the translation of the elongated guiding element 26, while only requiring the lever hub29 and the elongated guiding element 26 to connect, or abut, with each other at one small section,e.g. 90 degrees or less, of an imaginary circle that is concentric with a rotational axis of the lever hub29.

As described above, this means that the elongated guiding element 26 is arranged to bedisplaceable without rotation (from a first position 401) to a second position 402, in which the bolt18 is retracted.

Again, the elongated guiding element 26 is arranged to be biased towards the first position401 in which the lock hub 22 is in a first rotational hub position. When the lock hub 22 is rotated, e.g.by means of a knob, the lock hub 22 leaves the first rotational hub position, counter-clockwise orclockwise, while the elongated guiding element 26 at the same time is forced to leave its first biasedposition 401.

The lock hub 22 is connected to the guiding element 26 to provide a one-way conversion ofspindle 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 lever portion 550 of the gear arm 16 is spaced away from the mounting plate in order to allow the printed circuitboard to fit under the lever portion 550. The gear arm 16 comprises a projection 552 projecting froma cylindrical housing 554 enclosing the rotational axis 20 (shown in Figure 3) of the gear arm 16.

At a distal portion 556 of the gear arm 16, a preventing surface 558 is adapted to preventthat 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 exemplifying realization. ln this example,the groove 850 extends along somewhat more than half of the circumference of the lock hub 22.Notably, the lock hub 22 comprises two abutting surfaces 852, 854, which are adapted to cause the elongated guiding element 26 to be displaced from its first position 401 when desired.

Figure 7 illustrates an exemplifying printed circuit board 752 which takes advantage of thespace made available, amongst others thanks to the elongated guiding element 26. Other shapes of the exemplifying 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 754 using thespace 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 exemplifying hub arrangement 24. ln this example, thehub arrangement 24 comprises a cam pin 510, which may be rotated between at least a firstrotational position and a second rotational position to selectively cause either of the first or secondlever 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 1 forinstallation in a door leaf 2. Again, the door lock arrangement 1 comprises a mounting plate 12adapted to be received by the 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 or notupon on actuation of at least one of a first lever handle 8a and a second lever handle 8b, mountableat a first side 5 of the door leaf 2 and a second side 7 of the door leaf 2, respectively.

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

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

Firstly, the hub arrangement 24 further comprises a first engaging arm 501 having a firstproximal end 502 and a first distal end 503, wherein the first engaging arm 501 is biased to keep thefirst distal end 503 spaced apart from the first rower 25a, wherein the first proximal end 502 isrotatably mounted at a first face of the lever hub 29, wherein the first face faces the first side of thedoor leaf 2, wherein the first distal end 503 and the first rower 25a are adapted to cause, whenabutting against each other, the lever hub 29 to rotate when the first rower 25a is rotated whileallowing the lever hub 29 to rotate while not causing the first rower 25a to rotate.

Secondly, the hub arrangement 24 further comprises a second engaging arm 504 having asecond proximal end 505 and a second distal end 506, wherein the second engaging arm 504 isbiased to keep the second distal end 506 spaced apart from the second rower 25b, wherein thesecond proximal end 505 is rotatably mounted at a second face of the lever hub 29, wherein thesecond face faces the second side of the door leaf 2, wherein the second distal end 506 and thesecond rower 25b are adapted to cause, when abutting against each other, the lever hub 29 to rotatewhen 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 the campin 510 is rotatably installed.

The cam pin 510 is rotatable about a longitudinal axis thereof between at least a firstrotational position and a second rotational position. A difference in rotation between the first andsecond rotational positions may be 90 degrees, 180 degrees or another suitable value. An advantagewith 90 degrees compared to 180 degrees may be that the cam pin 510 need be rotated 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 first engagingarm 501 and a second end 610 in the vicinity of the second engaging arm 504, wherein the first end602 comprises a first forcing surface 604 and a first allowing surface 606, wherein the second end610 comprises a second forcing surface 612 and a second allowing surface 614.

When the cam pin 510 is in the first rotational position, the first forcing surface 604 isadapted to abut against the first proximal end 502 to force the first distal end 503, against bias of thefirst engaging arm 501, to abut against the first rower 25a. Moreover, when the cam pin 510 is in the first rotational position, the second allowing surface 614 is adapted to allow the second distal end 11 506 to be spaced apart from the second rower 25b according to bias of the second engaging arm504.

When the cam pin 510 is in the second rotational position, the first allowing surface 606 isadapted to allow the first distal end 503 to be spaced apart from the first rower 25a according to biasof the first engaging arm 501. Furthermore, when the cam pin 510 is in the second rotationalposition, the second forcing surface 612 is adapted to abut against the second proximal end 505 toforce the second distal end 506, against bias of the second engaging arm 504, to abut against the second rower 25b.

The mounting plate 12 may preferably comprise an opening 50 adapted to reveal a butt 620,provided at the second end 610 of the cam pin 510, that is adapted to allow the cam pin 510 to berotated 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 electrically activatablemoving member 40 having a displaceable element 42 that is displaceable between an engagingposition and a non-engaging position based on electrical activation of the electrically activatablemoving member 40. The electrically activatable moving member may be a solenoid, an electric motoror the like. The displaceable element 42 ensures that both the first and second engaging arms 501,504 are engaged with the first and second rowers 25a, 25b, respectively, when the displaceableelement 42 is in the engaging position and wherein the displaceable element 42 allows both the firstand second engaging arms 501, 504 to disengage with the first and second rowers 25a, 25b,respectively, when the displaceable element 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 engaged with therespective rower, e.g. the first and/or second rower 25a, 25b. An idea of the cam pin is thus that thecam pin by rotation exposes different sides, or faces, thereof to the first and second engaging arms501, 504 at the first and second ends 602, 610, respectively.

Therefore, the_first forcing surface 604 and the second forcing surface 612 may have manydifferent shapes that may suitably achieve that the first and/or second engaging arms 501, 504becomes engaged against their biases. For example, the first and second forcing surfaces 604, 612may be convex, protruding or the like. Similarly, the first and second allowing surfaces 606, 614 mayhave many different shapes that may suitably achieve that the first and/ second engaging arms 501, 504 are allowed to be spaced apart from its respective rower 25a, 25b. For example, the first and 12 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 and that isperpendicular to the through hole, wherein a ball spring plunger 520 is installed in the throughboreto secure the cam pin 510. As a result, rotation of the cam pin 510 is made inert to avoid unintentional rotation thereof. ln some embodiments, the cam pin 510 is rotatable about the longitudinal axis thereofbetween at least the first and second rotational positions and a third rotational position. ln theseembodiments, the first end 602 comprises a further first allowing surface 607, and the second end610 comprises a further second allowing surface 615. Additionally, when the cam pin 510 is in thethird rotational position, the first further allowing surface 607 is adapted to allow the first distal end503 to be spaced apart from the first rower 25a according to bias of the first engaging arm 501. Thisfurther means that, when the cam pin 510 is in the third rotational position, both the first forcingsurface 604 and the first allowing surface 606 are directed towards other direction than the firstrower 25a.

When the cam pin 510 is in the third rotational position, the second further allowing surface615 is adapted to allow the second distal end 506 to be spaced apart from the second rower 25baccording to bias of the second engaging arm 504. This further means that, when the cam pin 510 isin the third rotational position, both the second forcing surface 612 and the second allowing surface614 are directed towards other direction than the first rower 25a.

As illustrated by the dotted lines of the cross-sectional views of the first and second ends602, 610 of the cam pin 510 in the upper portion of Figure 10, the first and the further first allowingsurfaces 606, 607 and the second and the further second allowing surface 614, 614 may be differentportions of a respective common surface.

According to the embodiment of Figure 10, the rotational difference between the first andsecond rotational positions is 180 degrees, and the third rotational position may be located betweenthe 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 of the present invention is illustrated. Three portions of Figure11 illustrate locking and unlocking positions of an exemplifying auxiliary latch bolt 800 for installationin a door lock arrangement, such as the one described above or similar door lock arrangement.

The auxiliary latch bolt 800, when mounted in the door lock arrangement 1, is displaceable between a locking position 704, 706 and an unlocking position 702 by translation thereof in parallel 13 with a geometrical axis 63 that is perpendicular to a main plane 60 of a faceplate 10 of the door lockarrangement 1.

The auxiliary latch bolt 800 comprises a guiding unit 802 adapted to guide the auxiliary latch bolt 800 when being displaced between the locking position 704, 706 and the unlocking position 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 locking position 704, 706. The bolt 18 is allowed to, unlesslocked by the auxiliary latch bolt 800, be retracted while being biased to be extracted through thefaceplate 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 the unlockingposition 702.

The auxiliary latch bolt 800, when mounted in the door lock arrangement 1, projects less, ornot at all, through the faceplate 10 in the locking position 704, 706 than in the unlocking position702.

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

The auxiliary latch bolt 800 comprises an actuation unit 801 comprising a wedge-shapedportion 804, having two side surfaces 806, 808 meeting at a tip 810 of the wedge-shaped portion804.

The guiding unit 802 is adapted to guide the actuation unit 801 when the tip is caused tomove away from a secondary plane 61 that is perpendicular to the main plane 60 of the faceplate 10and parallel with a longitudinal axis 62 of the faceplate 10, wherein the tip 810 is located in thesecondary plane 61 when the auxiliary latch bolt 800 is in the unlocking position 702.

The actuation unit 801 comprises a base portion 812 having at least two supporting surfaces816, 818 arranged to abut against the faceplate 10 when the auxiliary latch bolt 800 is located in theunlocking position 702. The wedge-shaped portion 804 typically projects from and tapers in adirection 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. The baseportion 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 of the actuationunit 801 to abut against the guiding unit 802. The rounded face 814 is further adapted to guide the actuation unit 801 when the tip 810 is caused to move away from the secondary plane 61. This 14 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 latch bolt 800 is composed of only one actuation unit 801. Sincethere is only one actuation unit 801, there is e.g. less risk of that dirt or other debris may cause theactuation unit 801 to malfunction. With two actuation units, as in the prior art, debris may get stuckbetween the two moving and tilting actuation units and cause malfunction of the auxiliary latch bolt 800.

The actuation unit 801 may preferably be symmetric with respect to the secondary plane 61,being centrally located with respect to the faceplate 10. ln this manner, the auxiliary latch 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 be between 20and 60 degrees, more preferably between 25 and 40 degrees. By adjusting the magnitude of theangle, the displacement of the auxiliary latch bolt 800 into the interior of the door lock arrangement1. E.g. the lesser the angle, the larger the displacement into the interior of the door lock arrangement1. The angle may also depend on a depth of the faceplate, where the depth is measured perpendicularly to the secondary plane 61.

Figure 12 illustrates a series of views illustrating the exemplifying auxiliary latch bolt 800. ln this exemplary embodiment of the actuation unit 801, the aforementioned angle is about28 degrees, e.g. +/- two degrees.

Said at least two supporting surfaces 816, 818 may be one and the same surface, or they maybe separated by e.g. a groove 817 or other indentation. An idea of said at least two supportingsurfaces 816, 818 is that the actuation unit 801 of the auxiliary latch bolt 800 is caused to rotateabout 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 with theauxiliary latch bolt 800 to achieve locking and unlocking of an exemplifying bolt, such as the bolt 18.

The locking member 13 has a hook portion 1010 adapted to engage with the bolt, wherebythe bolt is prevented from being further retracted into the casing 14. Moreover, the locking member13 has a protruding locking support 1020 adapted to engage with the guiding unit 802 when the auxiliary latch bolt 800 is in the unlocking position 702. Furthermore, the locking 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, becombined with one or more other embodiments, examples, or features disclosed herein.

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

Claims (5)

16

1. CLAll\/IS1. An auxiliary latch bolt (800) for installation in a door lock arrangement (1), wherein the auxiliarylatch bolt (800), when mounted in the door lock arrangement (1), is displaceable between a lockingposition (704, 706) and an unlocking position (702) by translation thereof in parallel with ageometrical axis (63) that is perpendicular to a main plane (60) of a faceplate (10) of the door lockarrangement (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 belocked in a projecting position, in which the bolt projects through the faceplate (10), when theauxiliary 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 partly into aninterior of the door lock arrangement (1), when the auxiliary latch bolt (800) is located in theunlocking position (702), wherein the auxiliary latch bolt (800), when mounted in the door lock arrangement (1), projectsless, or not at all, through the faceplate (10) in the locking position (704, 706) than in the unlockingposition (702), wherein the auxiliary latch bolt (800), when mounted in the door lock arrangement (1), is springbiased towards the unlocking position (702), wherein 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-shapedportion (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) of thefaceplate (10) and parallel with a longitudinal axis (62) of the faceplate (10), wherein the tip (810) islocated in the secondary plane (61) when the auxiliary latch bolt (800) is in the unlocking position(702), wherein 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 latch bolt (800) islocated in the unlocking position (702), wherein the actuation unit (801) of the auxiliary latch bolt(800) is caused to rotate about one of said at least two supporting surfaces (816, 818) when beingdisplaced in a secondary direction perpendicular to the secondary plane (61), wherein the base portion (812) has a rounded face (814) adapted to the guiding unit (802), wherein the auxiliary latch bolt (800) is composed of only one actuation unit (801), wherein the 17 auxiliary latch bolt (800) is characterized in that the guiding unit (802) is adapted to allow the rounded face (814) of the actuation unit (801) toabut against the guiding unit (802), wherein the rounded face (814) is adapted to guide the actuationunit (801) when the tip (810) is caused to move away from the secondary plane (61), wherein aportion of the guiding unit (802) towards the actuation unit (801) is concave and formed as an inner surface (803) of a cylindric segment.

2. The auxiliary latch bolt (800) according to claim 1, wherein the actuation unit (801) is symmetric 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 angle between the secondary plane (61) and the side surfaces (806, 808) is between 20 and 60 degrees.

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