SE539717C2 - Spring bolt arrangement with blocking device, actuator and blocking member - Google Patents

Abstract

Abstract Spring bolt arrangement (1, 1”) comprising an axially displaceable spring bolt(10, 10”) with a bolt latch (20) and a blocking device. The spring bolt is fixedto the bolt latch, rotatably about a rotational axis. The blocking devicecomprises an actuator (30) and is switchable between a blocking state, inwhich the position of the spring bolt relative to the bolt latch is fixed and areleasing state. At least one blocking member (40a, 40b), is linearlydisplaceable relative to the actuator, the bolt latch and the spring bolt. A firstblocking recess (41a, 41b) arranged in the spring bolt (10), and a secondblocking recess (42a, 42b) arranged in the bolt latch (20). The actuator (30)is arranged to selectively maintain the blocking member (40a, 40b) insimultaneous engagement with the first blocking recess (41a, 41b) and thesecond blocking recess (42a, 42b), thereby maintaining the blocking device inthe blocking state and to allow the blocking member to be brought out ofengagement from at least one of the first and second blocking recesses, thereby setting the blocking device in the releasing state. Fig. 1

Description

SPRING BOLT ARRANGEMENT WITH BLOCKING DEVICE,ACTUATOR AND BLOCKING MEMBER Technical field The invention relates to a spring bolt arrangement comprising an axiallydisplaceable spring bolt with a bolt latch. The invention also relates to a lockcomprising such an arrangement. The spring bolt arrangement and the lock may particularly be used at emergency or evacuation doors.

Background Emergency and evacuation doors are often equipped with so-calledemergency or panic evacuation fittings or accessories. Such fittings aredisposed on the inner side of the door to allow quick and easy operation ofthe lock from the inner side of the door, from which evacuation through thedoor shall be allowed. The emergency doors are opened outwards and thefittings are configured and coupled to the bolts of the lock to allow the door to be opened with a simple thrust on a handle or a panic opening bar. ln panic situations, for example, where crowding occurs by the emergencydoor, it can happen that the crowd is pressed against the door before this hasbeen opened. The spring bolt of the lock is thus pressed against the strikingplate so that a friction force arises between them. Agreater force is henceneeded to be applied to the fitting in order to withdraw the spring bolt fromits engagement with the striking plate. ln order to prevent the need forexcessively large forces to operate the fitting, there are safety regulationswhich specify how large a maximum force on the operating members of thefitting may be required to open the door when a certain pressure force isapplied to the inner side of the door leaf. According to European safetyregulations, for example, the necessary force upon a panic fitting to operatethe lock must not exceed 220 N ifa pressure force of 1000 N is applied centrally to the inner side of the door leaf.

Prior art In order to reduce the forces which need to be applied to the fitting in panicsituations, it is previously known to configure the spring bolt such that it isrotatable relative to the bolt latch, about a rotation aXis which isperpendicular to the direction of aXial displacement of the spring bolt and ofthe bolt latch. In order to prevent the door from possibly opening from theoutside, the rotational motion of the spring bolt can selectively be blockedand allowed by means of a blocking device operated with the emergency orpanic evacuation fitting. When the door is pressed outwards and the fitting isactivated, the blocking device of the spring bolt is released, so that the springbolt can be rotated in the direction away from the striking plate, whereuponthe friction between them decreases. The force which is required to releasethe spring bolt from engagement with the striking plate is thereby reduced.Such rotatable spring bolts are sometimes referred to as collapsible spring bolts.

DE 102 07 630 A1 describes a lock having a latch bolt which is aXiallydisplaceable together with a latch carrier and is rotatable relative to the latchcarrier. The lock also comprises an electrically operable blocking device, withwhich the rotational motion of the latch relative to the latch carrier can beblocked or allowed. The construction shown in DE 102 07 630 A1 comprises anumber of lever arms, which makes it relatively complicated and bulky. Thedevice which is described therein additionally entails that the whole or arelatively large part of the force with which the striking plate is pressed again st the spring bolt is tran smitted to that part of the blocking device atwhich the release of the rotational motion of the latch shall be achieved.There is hence a risk that a relatively large force, transmitted from thestriking plate, will cause a high friction between the parts of the blocking device, whereby the force required to release the blocking device is high.

EP 1291478 A1 describes another lock having a spring bolt which is aXiallydisplaceable together with a bolt latch and is rotatable in relation to the latter. Ablocking device for selectively releasing and blocking the rotational motion of the spring bolt comprises a contact roller Which is disposed on arocker arm and which, in contact with two different surfaces on a linearlydisplaceable part of the blocking device, can selectively allow and preventlinear displacement of this part so as thereby to allow or prevent rotation ofthe spring bolt. This device, too, is relatively bulky and complicated. Thoughthe use of a rotating roller helps to reduce the friction in the blocking device,it simultaneously increases the spatial requirement, as well as the complexity of the device and the material and production costs.

WO 2009/ 096892 discloses a lock comprising a spring bolt with a bolt latchand a blocking device which is switchable between a release position in whichthe spring bolt may rotate relative to the bolt latch and a blocking position, inwhich the spring bolt is fixed relative to the bolt latch. The blocking devicecomprises a first and a second linearly displaceable element and at least twopairs of sliding surfaces arranged on the spring bolt, the first element and thesecond element and interacting in pairs. The displaceable elements areconnected one after the other in series with the spring bolt via the pairs of sliding surfaces.

Summary of the invention lt is an object of the present invention to provide an enhanced collap sible spring bolt. lt is another object to provide such a spring bolt arrangement which is simplein construction and which comprises only a comparatively low number of movable parts.Afurther object is to provide such an arrangement which is reliable in use.

A still further object is to provide such a spring bolt arrangement which requires only a limited space when mounted in a lock casing or the like.

Yet another object is to provide such a spring bolt arrangement which easy to mount.

These and other object are achieved by a spring bolt arrangement of the typespecified in the preamble of claim 1 and eXhibiting the special technicalfeatures set out in the characterizing portion of the claim. The inventivespring bolt arrangement comprises an aXially displaceable spring bolt with abolt latch and a blocking device. The spring bolt is fixed to the bolt latch,rotatably about a rotational aXis which is substantially perpendicular to thedirection of aXial displacement of the spring bolt and bolt latch. The blockingdevice is switchable between a blocking state, in which the position of thespring bolt relative to the bolt latch is fixed and a releasing state, in whichrotation of the spring bolt is allowed. The blocking device comprises anactuator which is arranged linearly displaceable between a first aXial positionand a second aXial position, inside of and relative to the bolt latch. At leastone blocking member is linearly displaceable relative to the actuator, the boltlatch and the spring bolt, in a direction which is essentially perpendicular tothe displacement direction of the actuator. A first blocking recess is arrangedin the spring bolt and a second blocking recess is arranged in the bolt latch.The actuator is arranged to, in the first aXial position, maintain the blockingmember in simultaneous engagement with the first blocking recess and thesecond blocking recess, thereby maintaining the blocking device in theblocking state and to, in the second aXial position, allow the blocking memberto be brought out of engagement from at least one of the first and second blocking recesses, thereby setting the blocking device in the releasing state.

The invention thus provides a spring bolt arrangement which requires only alow number of constituent parts and especially a low number of movableparts. Hereby, a very reliable arrangement is achieved. The low number ofparts also reduces the manufacturing costs and facilitates assembly of the arrangement and the mounting of it to a lock or the like.

The actuator may be arranged to drive the blocking member intosimultaneous engagement with the first and second blocking recess, during displacement from the second to the first aXial position.

The actuator may eXhibit a release recess Which is arranged to receive the blocking member When the actuator has assumed its second aXial position.

The first blocking recess may have a cross sectional geometry Whichcorresponds to the geometry of the blocking member, such that a recess Wallof the first blocking recess, in contact With the blocking member, urges theblocking member out of engagement With the first blocking recess, When theactuator has assumed its second aXial position and a rotational force is applied to the spring bolt.

The release recess may have a cross sectional geometry Which corresponds tothe geometry of the blocking member, such that a release recess Wall of therelease recess, in contact With the blocking member, urges the blockingmember into engagement With the first blocking recess, When the actuator is moved from the second to the first aXial position.The blocking member may eXhibit a curved periphery.The blocking member may be a ball.

The first blocking recess may be an elongated grove having a semi circular cross section.

The spring bolt arrangement may preferably comprise two blockingmembers, a pair of first blocking recesses and a pair of second blocking ICCCSSCS.

The at least one blocking member may be displaceable in a direction Which is parallel With the rotational aXis of the spring bolt.

A spring arrangement may be arranged to bias the actuator towards the first aXial position.

The invention also concerns a lock comprising a lock mechanism and such a spring bolt arrangement as Well as a door comprising such a lock.

Generally, all terms used in the claims are to be interpreted according to theirordinary meaning in the technical field, unless explicitly defined otherwiseherein. All references to "a/ an/the element, apparatus, component, means,step, etc." are to be interpreted openly as referring to at least one in stance ofthe element, apparatus, component, means, step, etc., unless explicitly statedotherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.

Brief description of the drawings The invention is now described, by way of example, with reference to the accompanying drawings, in which: Fig. l is an exploded perspective view ofa spring bolt arrangement according to an embodiment of the invention.

Fig. 2 is a perspective view illustrating the arrangement shown in fig. lwhen assembled and when the blocking device is in the blocking state.

Fig. 3 is a perspective view corresponding to fig. 2 illustrating the arrangement when the blocking device is in the releasing state.

Figs. 4 and 5 are longitudinal sections in perspective view corresponding to figs. 2 and 3 respectively.

Figs. 6 and 7 are cross sections in perspective view corresponding to figs. 4 and 5 respectively.

Figs. 8-10 are perspective views illu strating a lock provided with two springlock arrangements according to the invention and showing the lock arrangements in different states and positions.

Detailed description of embodiments The invention will now be described more fully herein after with reference tothe drawings illustrating exemplifying embodiments of the invention. Thedescription should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided by way of example so that this disclosure will be thorough and complete, and will fully convey the scopeof the invention to those skilled in the art. Like numbers refer to like elements throughout the description.

Figs. 1-7 show a spring bolt arrangement 1 according to a first embodiment ofthe invention. The spring bolt arrangement lcomprises a spring bolt 10 and a bolt latch 20.

The spring bolt 10 is rotationally connected to the bolt latch 20 by means of ashaft pivot 11 which in the example shown has the form ofa radiallycompressible pin sleeve eXhibiting a longitudinal slot. The shaft pivot mayhowever be formed in many different ways. The spring bolt may be rotatedbetween a locking position (shown in figs. 2, 4 and 6) and a collapsedposition (shown in figs. 3, 5, and 7). As common for spring bolts, it eXhibits astop side 12 which is intended to be in engagement with a striker plate (notshown) for keeping a door (not shown) closed. In the locking rotationalposition of the spring bolt 10, the stop surface is arranged generally inparallel with the longitudinal direction of the bolt latch. An angled side 13 isarranged opposite to the stop side 12. When shutting the door, the angledside 13 makes contact with the striker plate and forces the spring bolt 10 andthe bolt latch 20 to be retracted into the lock case 50 (see figs. 8-10) .It ispossible to adapt the spring bolt arrangement 1 for left and right hand doorsby rotating the spring bolt 10 about the longitudinal aXis of the bolt latch 20to a corresponding rotational orientation. The spring bolt 10 furthercomprises a bolt neck which is formed by two flanges 14a, 14b protruding inthe direction towards the bolt latch 20. Both flanges are provided with a through hole 15a, 15b for receiving the shaft pivot 11.

The bolt latch 20 has a generally U-shaped cross section, formed by a top wall21 and two mutually opposed side walls 22a, 22b. The top 21 and side 22a,22b walls thus define a downwardly (as seen in fig. 1) open channel 25. At aforward end of the bolt latch 20, proximal to the spring bolt 10, each side wall22a, 22b is provided with a through hole 23a, 23b which receives the shaftpivot 11. At the rear end, distal to the spring bolt 10, the bolt latch 20 eXhibits a radially protruding manoeuvring collar 24, The manoeuvring collar eXhibitsa slot 26, Which is aligned with the channel 25. Aguiding peg 27 is arrangedat the upper edge of the manoeuvring collar 24 and is intended to be received in a guiding slot (not shown) of the top or bottom Wall of a lock case 50.

The spring bolt arrangement 1further comprises a blocking device, which isarranged to selectively allow and prevent rotation of the spring bolt 10 aboutits rotational aXis defined by the shaft pivot 11. The blocking device comprisesan actuator 30 which is arranged linearly displaceable in the channel 25,along the longitudinal aXis of the bolt latch 20. The actuator has a generalyrectangular cross section. Amanoeuvring peg 31 is arranged at the rear endof the actuator 30. The manoeuvring peg 31 protrudes downwards, such thatit may be received in the slot 26 and aligned with the manoeuvring flange 24when the actuator assumes a rearwardly displaced position. The front end ofthe actuator is formed as a fork with two forwardly protruding tines 32a, 32barranged one above the other. The tines 32a, 32b both have curved tips whichtapper in the forward direction. The shaft pivot 11 is received between the twotines 32a, 32b, such that the actuator 30 is guided by the shaft pivot 11,during aXial displacement. Arectangular through opening 33 is arrangedsomewhat behind the middle of the actuator 30 and extends in thelongitudinal direction of the actuator 30. Ahelical compression spring 34 isarranged in the through opening 33. The forward end of the spring 34 bearsagainst a front wall 33a of the through opening 33. The rear end of the springbears against a cylindrical support sleeve 35 which is threaded onto a fiXationpin 36, which in turn is fixed in fiXation holes 37a, 37b arranged in the sidewalls 22a, 22b of the bolt latch 20. By this means the actuator 30 is preten sioned or biased forwardly towards a first aXial position. When a forcegreater than the spring force is applied to the actuator in the rearwarddirection, the actuator 30 is displaced rearwardly to a second aXial position, under compression of the spring 34.

The actuator 30 further eXhibits two release recesses 38a, 38b arranged inopposing lateral side surfaces of the actuator, just behind the tines 32a, 32b.

The release recesses 38a, 38b tappers inwardly. An area arranged on each lateral side of the actuator 30, just behind a respective release recess 38a, 38bforms a blocking surface 39a, 39b of the blocking device. The release recesses38a, 38b are arranged to receive a respective blocking member 40 a, 40b. In the shown embodiments the blocking members are formed as balls.

The spring bolt l0 eXhibits two first blocking recesses 4la, 4lb, which arearranged on the in side ofa respective flange l4a, l4b, just behind the shaftpivot receiving through holes l5a, l5b. In the shown example the firstblocking recesses are formed as longitudinal grooves, eXtending in parallelwith the longitudinal aXis of the bolt latch 20 when the spring bolt l0assumes its locking rotational position. The first blocking recesses 4la, 4lbeXtend rearwardly all the way to the rear end of the respective flange l4a, l4b.The cross section of the blocking recesses 4la, 4lb is semi circular with aradius that corresponds to the radius of the blocking members 40a, 40b.When the blocking members are con stituted by balls, the first blockingrecesses may also be formed semi spherical. The first blocking recesses arepositioned such that they are aligned with the blocking surfaces when thespring bolt l0 is in the locking rotational position and the actuator 20 is in the first axial position.

Two second blocking recesses 42a, 42b are arranged, one in each side wall22a, 22b. The second blocking recesses 42a, 42b are formed as cylindricalthrough holes having a radius which is essentially the same as the radius ofthe blocking members 40 a, 40b. The second blocking recesses are positionedsuch that they are aligned with the blocking surfaces 39a, 39b when theactuator is in the first aXial position and with the release recesses when the actuator is in the second aXial position.

The actuator 30 is further provided with a resetting pin 45 which projectsupwardly from the upper side of the actuator 30 and eXtends through an elongated opening 46 arranged through the top wall 2l of the bolt latch 20.

With reference to figs 2-7 the functioning of the spring bolt arrangement will now be explained. Figs 2, 4, and 6 illustrate the arrangement lin a first operational mode. In these figures the spring bolt 10 is in its lockingrotational position such that the stop surface may engage a striker plate (notshown) to thereby keep the door closed. The actuator 30 is biased forwardly,by means of the spring 34, to the first aXial position. In this axial position theblocking surfaces 39a, 39b of the actuator 30 are aligned with the first 41a,41b and second 42a, 42b blocking recesses. By this means, the blockingmembers 40 a, 40b are maintained in an outwardly displaced position. In thisposition, the blocking members 40 a, 40b each simultaneously engages both afirst 41a, 41b and a second 42a, 42b blocking recess. Thereby, the spring bolt10 is prevented from rotating from the locking to the collap sed rotationalposition. Ifa force is applied to the spring bolt 10 in the rotational directiontoward the collap sed position, the curved recess walls of the first blockingrecesses 41a, 41b will urge the blocking members 40 a, 40b inwardly, towardthe actuator 30. However, since the blocking members 40 a, 40b aresupported by the flat blocking surfaces 39a, 39b, which are arrangedperpendicular to the radial displacement direction of the blocking members,no force in the aXial direction of the actuator 30 will be transmitted to theactuator. Thereby the blocking members 40 a, 40b are securely maintained insimultaneous engagement with both the spring bolt 10 and the bolt latch 20,such that the spring bolt 10 is prevented from collap sing.

When evacuation through the door provided with the spring boltarrangement is to be allowed, a coupling arm or the like arranged in the lockcase and connected e.g. to an evacuation handle or panic bar acts on themanoeuvring peg 31 of the actuator 30. The manoeuvring peg 31 is pushedbackwards, again st the spring force eXerted by the spring 34, such that theactuator 30 is displaced aXially to its second aXial position. Hereby, therelease recesses 38a, 38b are brought into alignment with the first 41a, 41band second 42a, 42b blocking recesses. The blocking members 40 a, 40b arethus allowed to be displaced inwardly such th at they are received in therelease recesses 38a, 38b. As soon as any force is applied to the spring bolt inthe rotational direction towards collapsed position this force will be transmitted by means of the curved recess walls of the first blocking recesses 11 41a, 41b, to the blocking members 40 a, 40b. The blocking members 40 a, 40bare thus pushed into the release recesses 38a, 38b such that they are broughtout of engagement with the first blocking recesses 41a, 41b. Thereby, thespring bolt 10 is allowed to rotate, and the force applied by the striker platewill cause the spring bolt to assume its collap sed position. The spring boltarrangement has then assumed the operational mode and position illustratedin figs. 3, 5 and 7. At the collapsed position, the stop surface 12 is arranged atan angle to the striker plate such that the force applied by the striker plate istransferred to an axial force on the spring bolt 10. This aXial force thuscontributes to displace the spring bolt 10 together with the bolt latch 20 andthe actuator 30 rearwardly, into the lock case, such that the spring bolt 10 isbrought completely out of engagement with the striker plate and the door may be opened. lt should be noted that the geometry of the first blocking recesses and theblocking members provides for that the force is tran smitted from the springbolt via the blocking member to the actuator under a certain gear ratio. It isthus possible to choose how great force that is needed to be applied to thespring bold for collapsing the bolt by designing the relative angles betweenthe walls of the first blocking recesses and the corresponding surface of the blocking members.

For bringing the spring bolt arrangement back to the first operational modeillustrated in figs. 2, 4 and 6, a latch bolt spring (not shown) acts on theresetting pin 45 and pushes the resetting pin 45 in the forward direction. Bythis means the actuator 30 is urged forwardly. However, since the firstblocking recesses 41a, 41b have been brought out of alignment with thesecond blocking recesses 42a, 42b, the blocking members 40 a, 40b can notmove radially outwards. Thereby, the blocking members 40 a, 40b, in contactwith the release recesses 38a, 38b and the second blocking recesses 42a, 42bwill drive the bolt latch 20 and the spring bolt 10 to be displaced forwardlytogether with the actuator. During this initial forward displacement, an outersurface of the spring bolt 10 makes contact with the edge ofa spring boltopening 51 (fig. 8-10) arranged in the forend 51 of a lock case 50 and forces 12 the spring bolt 10 to be rotated back to is 1ocking rotationa1 position.Thereby, the b1ocking recesses 41a, 41b are again a1igned with the secondb1ocking recesses 42a, 42b and the b1ocking members are a11owed to bedisp1aced radia11y outward1y into the first b1ocking recesses 41a, 41b. Theactuator may then be pushed forward1y re1ative to the bo1t1atch 20, such thatit again assumes its first aXia1 position. During this disp1acement of theactuator re1ative to the bo1t 1atch 20 , the tapering wa11s of the re1ease recesses38a, 38b, drives the contact members radia11y outwards into simu1taneousengagement with the first 41a, 41b and second, 42a, 42b b1ocking recesses. Atthis position the resetting pin 45 a1so makes contact with the front edge of thee1ongated through opening 46, such that continued forward movement of theresetting pin 45 brings about simu1taneous forward aXia1disp1acement of theactuator 30, the bo1t1atch 20 and the spring bo1t. The spring 1ockarrangement then reassumes its position and state as shown in figs. 2, 4 and 6.

Fig. 8-10 i11ustrates an example ofhow the spring bo1t arrangement 1i11ustrated in figs. 1-7 may be mounted in a 1ock 50. The 1ock 50 a1socomprises a second spring bo1t arrangement 1' which functions essentia1y inthe same way as the spring bo1t arrangement 1, but which is shorter than the spring bo1t arrangement 1i11ustrated in figs 1-7.

The 1ock 50 comprises a 1ock case 52 and a forend 53. The spring bo1tarrangements 1, 1' are arranged 1inear1y disp1aceab1e in the 1ock case 52 suchthat the spring bo1ts 10, 10 ° may be disp1ace outward1y and inward1y througha respective spring bo1t opening 51, 51' arranged in the forend 53 of the 1ock CaSC.

The 1ock 50 further comprises a 1ock mechanism arranged in the 1ock case.The 1ock mechanism transfers movements from fo11owers (not shown) to thespring bo1t arrangements 1, 1' for manoeuvring as described above. Thefo11owers may be connected to evacuation hand1es, panic bars (not shown)and other fittings for a11owing fast and re1iab1e emergency eXit through a door provided with the 1ock 50. 13 Fig. 8 shows the lock 50 When the spring bolts 10, 10 ° and the bolt latcheshave been displaced aXially outwardly, the spring bolts are in the lockingrotational positions and the actuators are in the first aXial positions. Fig. 9shows the lock when the spring bolts 10, 10 ° and the bolt latches have beendisplaced outwardly, the actuators have assumed the second aXial positionsand the spring bolts have rotated to the collapsed position. Fig. 10 shows thelock in the same state as in fig 9, but were the spring bolts 10, 10' have been aXially displaced inwardly to their respective retracted positions.

The invention has mainly been described above with reference to a fewembodiments. However, as is readily appreciated by a person skilled in theart, other embodiments than the ones disclosed above are equally possiblewithin the scope of the invention, as defined by the appended patent claims.For example, the blocking members need not be formed as balls, but canassume many other shapes such as cylindrical. However, the geometry of theblocking member should correspond to the geometry of the first and secondblocking recesses, such that the blocking member may be brought intosimultaneous engagement with both the first and the second blockingrecesses. Preferably the geometry of the blocking members, should alsocorrespond to the first blocking recesses such that a rotational force andmotion applied to the spring bolt may be transferred to a linear force andmotion of the blocking member. In the shown embodiment the arrangementis provided with two blocking members. However it is also possible to providethe arrangement with only one or a larger number of blocking members and acorresponding number of first and second blocking recesses. The inventivespring lock arrangement may also be applies at other locks than locks foremergency or evacuation doors, e.g. in other locks and doors where it is desirable to reduce the forces needed to open the door.

Claims (14)

14 Claim s

1. Spring bolt arrangement (1, 1°) comprising an axially displaceable springbolt (10, 10 °) with a bolt latch (20) and a blocking device, wherein; -the spring bolt (10, 10 °) is fixed to the bolt latch (20), rotatably about arotational aXis which is substantially perpendicular to the direction of aXialdisplacement of the spring bolt (10, 10 °) and bolt latch (20), - the blocking device is switchable between a blocking state, in which theposition of the spring bolt (10, 10 °) relative to the bolt (20) latch is fixed and areleasing state, in which rotation of the spring bolt (10, 10 °)is allowed,characterized in that the blocking device comprises; - an actuator (30) which is arranged linearly displaceable between a first aXialposition and a second aXial position, inside of and relative to the bolt latch(20), - at least one blocking member (40 a, 40b), which is linearly displaceablerelative to the actuator (30), the bolt latch (20) and the spring bolt (10, 10 °, ina direction which is essentially perpendicular to the displacement direction ofthe actuator, - a first blocking recess (41a, 41b) arranged in the spring bolt (10), and - a second blocking recess (42a, 42b) arranged in the bolt latch (20), wherein- the actuator (30) is arranged to, in the first aXial position, maintain theblocking member (40a, 40b) in simultaneous engagement with the firstblocking recess (41a, 41b) and the second blocking recess (42a, 42b), therebymaintaining the blocking device in the blocking state and to, in the secondaXial position, allow the blocking member (40 a, 40b) to be brought out ofengagement from at least one of the first (41a, 41b) and second (42a, 42b) blocking recesses, thereby setting the blocking device in the releasing state.

2. Spring bolt arrangement according to claim 1, wherein the actuator (30)is arranged to drive the blocking member (40 a, 40b) into simultaneousengagement with the first (41a, 41b) and second (42a, 42b) blocking recess, during displacement from the second to the first aXial position.

3. Spring bolt arrangement according to c1aim 1 or 2, Wherein the actuator(30) eXhibits a re1ease recess (38a, 38b) Which is arranged to receive theb1ocking member (40a, 40b) When the actuator has assumed its second aXia1 position.

4. Spring bolt arrangement according to any one of c1aims 1-3, Wherein thefirst b1ocking recess (41a, 41b) has a cross sectiona1geometry Whichcorresponds to the geometry of the b1ocking member (40 a, 40b), such that arecess Wa11 of the first b1ocking recess, in contact With the b1ocking member,urges the b1ocking member out of engagement With the second b1ockingrecess, When the actuator (30) has assumed its second aXia1 position and a rotationa1 force is app1ied to the spring bo1t (10).

5. Spring bo1t arrangement according c1aim 3, Wherein the re1ease recess(38a, 38b) has a cross sectiona1geometry Which corresponds to the geometryof the b1ocking member (40 a, 40b), such that a re1ease recess Wa11 of there1ease recess, in contact With the b1ocking member, urges the b1ockingmember into engagement With the first b1ocking recess (41a, 41b), When the actuator is moved from the second to the first aXia1 position.

6. Spring bo1t arrangement according to any one of c1aims 1-5, Wherein the blocking member (40 a, 40b) eXhibits a curved periphery.

7. Spring bo1t arrangement according to c1aim 6, Wherein the b1ocking member (40 a, 40b) is a ba11.

8. Spring bo1t arrangement according to c1aim 7, Wherein the first b1ocking recess (41a, 41b) is an e1ongated grove having a semi circu1ar cross section.

9. Spring bo1t arrangement according to any one of c1aims 1-8, comprisingtwo b1ocking members (40 a, 40b) , a pair of first b1ocking recesses (41a, 41b) and a pair of second b1ocking recesses (42a, 42b).

10. Spring bo1t arrangement according to any one of c1aims 1-9, Wherein theat 1east one b1ocking member (40 a, 40b) is disp1aceab1e in a direction Which is para11e1With the rotationa1 aXis of the spring bo1t (10). 16

11. Spring bolt arrangement according to any one of c1aims 1-10,comprising a spring arrangement (34) Which is arranged to bias the actuator (30) towards the first aXia1 position.

12. Alock comprising a lock case, a lock mechanism and a spring bolt arrangement according to any of c1aims 1-11.

13. Adoor comprising a 1ock according to c1aim 12.

14. Adoor according to c1aim 13, Wherein the door is an emergency orevacuation door and further comprises emergency or evacuation fittings and/ or accessories.