SE539359C2 - Variable-size bed arrangement - Google Patents

Abstract

ABSTRACT The present invention relates to a variable-size bed arrangement (10)comprising a mattress core (30) and a base (20), which base (20) is adaptedto support at least a portion of the mattress core (30). The bed arrangement(10) comprises a cover layer (50) arranged to cover the mattress core (30).The bed arrangement (10) is adjustable between an expanded state and acontracted state. The bed arrangement (10) comprises means for adjustingthe cover layer (50) so as to provide a covering over the mattress core (30) inboth the expanded state and the contracted state of the bed arrangement(10). The means for adjusting the cover layer comprises a springarrangement (90) connected to one end (50b) of the cover layer (50) suchthat a spring load is applied to said cover layer (50) by adjusting the bedarrangement (10) to the expanded state. The present invention also relates to a vehicle comprising a bed arrangement. (Fig. sb)

Description

VARIABLE-SIZE BED ARRANGEIVIENT TECHNICAL FIELD The invention relates to a variable-size bed arrangement according to thepreamble of claim 1. The invention also relates to a vehicle. The invention also relates to a vehicle.

BACKG ROUND ART Bed arrangements with variable size where the bed arrangement is adjustablebetween an expanded state and a contracted state by means of some kind ofextension mechanism are known. Such variable-size bed arrangements areadvantageous in trucks or lorry cabs where space may be limited. Suchvariable-size bed arrangement may function as a sleeping arrangement in the expanded state and a seating arrangement in the contracted state.

SE532788C2 discloses a variable-size bed comprising a mattress core and abase, which base is adapted to support at least a portion of the mattress core.The mattress core and the base are changeable between an expanded stateand a contracted state. The bed arrangement comprises means for adjustingthe cover layer so as to provide a covering over the mattress core in both theexpanded state and the contracted state of the bed arrangement. The meansfor adjusting the cover layer comprises a roll-up device adapted to roll out thecover layer in the expanded state and roll in the cover layer in the contractedstate. The bed arrangement further comprises a padding layer arrangedbetween the mattress core and the cover layer, the padding layer beingconfigured to be moved by means of a second roll-up device so that a portionof the padding layer is folded down in connection to the roll in the contractedstate.

Such a means with roll-up devices occupies space in both the width and height direction of the bed arrangement.

There is thus a need to further improve variable-sized bed arrangement inorder to provide a space efficient bed arrangement facilitating efficientadjustment of the cover layer.

OBJECTS OF THE INVENTION An object of the present invention is to provide a space efficient bedarrangement facilitating efficient adjustment of the cover layer which is spaceefficient.

SUMMARY OF THE INVENTION These and other objects, apparent from the following description, are achievedby an extension mechanism, a variable-size bed arrangement and a vehicleas set out in the appended independent claims. Preferred embodiments of theextension mechanism and the bed arrangement are defined in appendeddependent claims.

Specifically an object of the invention is achieved by a variable-size bedarrangement comprising a mattress core and a base, which base is adaptedto support at least a portion of the mattress core. The bed arrangement furthercomprises a cover layer arranged to cover the mattress core. The bedarrangement is adjustable between an expanded state and a contracted state.The bed arrangement comprises means for adjusting the cover layer so as toprovide a covering over the mattress core in both the expanded state and thecontracted state of the bed arrangement. The means for adjusting the coverlayer comprises a spring arrangement connected to one end of the cover layer such that a spring load is applied to said cover layer by adjusting the bed arrangement to the expanded state. íšaid spring arrangement cornbrises a firstsprång rnerriber, a second spring rrierttber and a bar etetrtent. said bar element ;f\ being connected bettveest the first and second språng mentbers. -\ v: -'\ ww '~*\-\.- iir-w »~\ w*- mï *Ewe 5-\»~\-\=\~\\\ »'\\\ÄJ »'1\-5\;\\ ilkß. \~.~! ß.\\ s' v: 4»\ ..-~.-,-~.-\-\.-\.Nvmng +.\,_\ .M .~\.\ .\,,.~_.\,\.\,\\_ “g . . » t n. . .Hxvßl n \.\! .\»\ dt I '\ i» x Fx ' ~ v t' !\»\ svßu n \,\! !\~.\ ax u På!! IQ \»~'\~.-! > t\,~\ t\~\ vfiv w-l* . ~ . -_x.~\-\ ,_\..__.~\tt-_x-t ..~\ . ~ .~: sšaunzs: \.\iit.t::\t-*\.~\» tu tt _61. '.=..~ .ut t .t ~ . - _ t - .- i t t - , , t~ ~~*~-\'-*\.f\' et' '-\ \-\-.~*wr\.~x*~.~'r*w *r-*fisx svt: ^t~ r v» u* ~^.:---'\.~*:.f\\.~*\' * ' " “\.-'\.: \.1:.\.\>.\~_.-. E-'E-'a av: vi: s t: :\.- 'M-'m- ' ~ .~: :i :Q :Ai i Lä: :cêxflxs v _. « 1. ~.\ »s 'WN w. _ .N -,\.~\ -\ f .w \ . .q . . .wfi ,-\ ._ s. ~ ;-\ _. v:to st = nu oss n s: :tsenmtšs t ~ - t i i g c~^\ r: -*_\_i r\* rg t -'_\ :N13 s. - -\ V -*\ v * \ .~ -\ 'I tm ist» u ušsït: « ~ ~ ef: \.- t « \ i E _» »x S-»t -~ i ~~ attt'.\.\ w x.- .xats ss.- .a Hereby etfšctent adtustrnent ot the cover Eaver bettveen the cotttracted stateand expanded state is obtained xvith a space efficient cortstrttctšon of the bed arrangement, m' ' in .q _. " " :__ _ .ai a ...n both regarding height and width. eterebyFurther, no roll-up device is required in order to obtain the adjustment of thecover layer, hereby facilitating a space efficient construction of the bed arrangement.

The bed arrangement with the spring arrangement is applicable to any suitablelocation. The bed arrangement may be arranged in a vehicle such as a truckcabin. The bed arrangement may be arranged in other vehicles such as pickuptrucks, vans, campers, trains and also be used as hospital bed, camping bed or the like.

According to an embodiment of the bed arrangement the spring arrangementcomprises at least one spring member arranged to be compressed in theexpanded state so as to provide said spring load to said cover layer. Herebyefficient adjustment of the cover layer between the contracted state andexpanded state is obtained facilitating a space efficient construction of the bed arrangement.

According to an embodiment of the bed arrangement said one end of the coverlayer is connected to said bar element. Hereby efficient operation of the spring arrangement is obtained.

According to an embodiment of the bed arrangement said one end of the coverlayer is connected to a run and arranged to slide against said bar element.Hereby efficient operation of the spring arrangement is obtained. »arrangementf According to an embodiment of the bed arrangement the mattress corecomprises an extension mechanism, said extension mechanism comprisingrows of interconnected spring members and rods linked to the spring members in a parallelogram configuration to provide a resilient mattress core portion.

Hereby easy adjustment of a bed arrangement is facilitated withoutcompromising the sleeping comfort. Such an extension mechanism isaccording to an embodiment arranged to be a complement to a non-expandable pocket-spring mattress core comprising a plurality ofinterconnected coil springs enclosed in spring covers, the extensionmechanism thus acting as the extendable portion of the mattress core. Such an extension mechanism could be arranged to be a complement to anysuitable non-extendable mattress core portion such as any suitable resilientmattress core portion having any suitable spring configuration and/or layerconfiguration. Such an extension mechanism is according to an alternativeembodiment arranged to provide substantially the whole mattress core of thebed arrangement, thus providing extension function of the mattress core andresilience for sleeping comfort. By applying the extension mechanism to a bedarrangement space saving of the bed arrangement is facilitated.

The adjustment of the bed arrangement between an expanded state and acontracted state is an adjustment of the width of the bed arrangement betweenan expanded state and a contracted state. The adjustment of the bedarrangement between an expanded state and a contracted state couldaccording to an alternative embodiment be an adjustment of the length of thebed arrangement between an expanded state and a contracted state.

The extension mechanism may be one set of such parallelogramconfigurations or two or more such parallelogram configurations separated from each other.

According to an embodiment of the bed arrangement the rows ofinterconnected spring members and the rods linked to the spring members arepivotable relative to each other at said links to be substantially parallel in thecontracted state and having an angle relative to each other in the expandedstate. Hereby an efficient construction for facilitating extension and contraction of the extension mechanism is provided.

According to an embodiment of the bed arrangement the rows ofinterconnected spring members are mutually parallel and the rows of rods aremutually parallel in the expanded state as well as the contracted state. Herebyan efficient construction for facilitating extension and contraction of the extension mechanism is provided.

According to an embodiment of the extension mechanism the respectivespring member comprises arc shaped and/or ring shaped parts arranged insaid rows with the curved sides facing each other. Hereby a mattress coreproviding an equal comfort compared to a pocket spring mattress core isprovided in an efficient way.

The extension mechanism can have any suitable shape with spring membersin rows. The rows of spring members can be formed in one piece with ring shapes linked together.

According to an embodiment of the extension mechanism the rods are linkedto the upper side and/or lower side of the arc shaped and/or ring shaped partsof the spring members. Hereby an efficient construction for facilitating extension and contraction of the extension mechanism is provided.

According to an embodiment of the extension mechanism the rows ofinterconnected spring members are configured to be at least part of the mattress core of the bed arrangement.

According to an embodiment of the extension mechanism the spring membersare made of a polymeric material. Hereby a construction with relatively lightweight is provided. Hereby a construction is provided which is relatively easy to manufacture.

According to an embodiment of the bed arrangement said extensionmechanism is slidably connected to said base and slidably connected to afastening member of said bed arrangement movable relative to said base.

Hereby efficient operation of the extension mechanism is obtained.

According to an embodiment the bed arrangement further comprises a pieceof padding layer arranged between the mattress core and the cover layer, thepiece of padding layer comprising perforations distributed over at least aportion of the padding layer so as to allow said piece of padding layer toexpand its total surface cover in the expanded state. Hereby no roll-up device is required in order to obtain the adjustment of the padding layer, herebyfacilitating a space efficient construction of the bed arrangement. Hereby thepadding layer does not need to be fo|ded down in the contracted state thus saving space.

According to an embodiment of the bed arrangement said perforations havean elongated shape. The elongated shape is in the length direction of the bedarrangement when the bed arrangement is adjustable in the width direction.By having an elongated shape of the perforations efficient expansion of thepadding layer is obtained. Elongated shape of the perforations further reducesthe risk of cracks or the like on the padding layer when expanding the padding layer According to an embodiment of the bed arrangement said elongated shapedperforations have the shape of two arcs with their respective ends connected,the curvature of the arcs decreasing in the expanded state. Hereby efficientexpansion of the padding layer is obtained. Hereby the risk of cracks or thelike on the padding layer is reduced when expanding the padding layer.

According to an embodiment of the bed arrangement said elongated shapedperforations have an oval shape. Hereby efficient expansion of the paddinglayer is obtained. Hereby the risk of cracks or the like on the padding layer is reduced when expanding the padding layer.

According to an embodiment of the bed arrangement the padding layercomprises a foam material. According to an embodiment the foam material isfoam rubber. Hereby a material suitable for such expansion is obtained which provides a good sleeping/sitting comfort.

A vehicle comprising a bed arrangement according to the invention.

BRIEF DESCRIPTION OF THE DRAWINGS For a better understanding of the present invention reference is made to thefollowing detailed description when read in conjunction with the accompanyingdrawings, wherein like reference characters refer to like parts throughout the several views, and in which: Fig. 1 schematically illustrates a side view of a vehicle according to the present invenfion; Fig. 2a schematically illustrates a perspective view of a variable-size bedarrangement according to an embodiment of the present invention in acontracted state; Fig. 2b schematically illustrates a perspective view of the variable-size bed arrangement in fig. 2a in an expanded state; Fig. 3a schematically illustrates a view from above of the bed arrangement infig. 2a in the expanded state without cover layer; Fig. 3b schematically illustrates a view from underneath of the bed arrangement in fig. 2a in the expanded state without cover layer;Fig. 3c schematically illustrates a back view of the bed arrangement in fig. 2a; Fig. 3d schematically illustrates a perspective view of the bed arrangement infig. 2a in the expanded state without cover layer; Fig. 4a schematically illustrates a side view of the bed arrangement in fig. 2ain the contracted state; Fig. 4b schematically illustrates a side view of the bed arrangement in fig. 2ain the expanded state; Fig. 5a schematically illustrates a cross sectional side view of the bedarrangement in fig. 2a in the contracted state; Fig. 5b schematically illustrates a cross sectional side view of the bed arrangement in fig. 2a in the expanded state; and Fig. 6a schematically illustrates a perspective view of an extension mechanism according to an embodiment of the present invention in a contracted state; Fig. 6b schematically illustrates a plan view of the extension mechanism in fig. 6a in the contracted state; Fig. 6c schematically illustrates a perspective view of the extensionmechanism in fig. 6a in an expanded state; Fig. 6d schematically illustrates a plan view of the extension mechanism in fig. 6a in the expanded state; Fig. 7a schematically illustrates a perspective view of piece of padding layeraccording to an embodiment of the present invention in a contracted state; Fig. 7b schematically illustrates a perspective view of the piece of padding layer in fig. 7a in the expanded state; Fig. 7c schematically illustrates a plan view of a perforation of the piece ofpadding layer in fig. 7b in the expanded state; Fig. 8a schematically illustrates a plan view of the piece of padding layer in fig.7a in the contracted state; Fig. 8b schematically illustrates a cross sectional side view of the piece of padding layer in fig. 8a Fig. 8c schematically illustrates a plan view of the piece of padding layer in fig.7a in the expanded state; and Fig. 8d schematically illustrates a cross sectional side view of the piece of padding layer in fig. 8c.

DETAILED DESCRIPTION Fig. 1 schematically illustrates a side view of a vehicle 1 according to thepresent invention. The exemplified vehicle 1 is a heavy vehicle in the shape ofa truck with a cab 2. The vehicle according to the present invention could beany suitable vehicle such as a lorry or a car. The vehicle comprises a variable- size bed arrangement 10 according to the present invention.

Fig. 2a and 2b schematically illustrates perspective views of a variable-sizebed arrangement 10 according to the present invention in a contracted stateand expanded state respectively.

The bed arrangement 10 is applicable to any suitable location. The bedarrangement 10 may be arranged in a vehicle such as a truck cabin. The bedarrangement 10 may be arranged in other vehicles such as pickup trucks,vans, campers, trains and also be used as hospital bed, camping bed or thelike.

The bed arrangement 10 has an upper side 10a, an underside 10b, a front side10c and a back side 10d. The bed arrangement 10 further has a first short side 10e and an opposite second short side 10f.

The bed arrangement 10 has a length L and a height H. The variable-size bedarrangement 10 has an adjustable width, the width being adjustable betweena contracted state with a width W1 illustrated in fig. 2a and an expanded statewith a width W2 illustrated in fig. 2b.

The bed arrangement 10 comprises a base 20 and a mattress core 30, whichbase 20 is adapted to support at least a portion of the mattress core 30. The base 20 functions as a bed carrier.

The bed arrangement 10 further comprises a padding layer 40 arranged onthe upper side of the mattress core 30. The padding layer 40 is a piece of padding layer 40.

The bed arrangement 10 further comprises a cover layer 50 arranged to coverthe upper side of the mattress core 30 and the padding layer 40. The paddinglayer 40 is provided in between the mattress core 30 and the cover layer 50.

Fig. 3a-d schematically illustrates different views of the bed arrangement 10 inthe expanded state without cover layer 50 exposing the piece of padding layer40.

As can be seen in fig. 3b the base 20 has a substantially rectangular shape.

As can be seen in e.g. fig. 3d the mattress core 30 comprises a so calledpocket spring mattress core 32. The pocket spring mattress core 32 comprisesa plurality of interconnected coil springs 32a. The coil springs 32a are arrangedin several strips each comprising two layer portions arranged so as to formspring covers for enclosing the coil springs.

Fig. 4a and 4b schematically illustrates a side view and fig. 5a and 5b a crosssectional side view of the bed arrangement 10 in the contracted state andexpanded state.

The bed arrangement 10 comprises an extension mechanism 60 for adjustingthe bed arrangement 10 between an expanded state and a contracted state.The extension mechanism 60 integrated in the bed arrangement 10 can beseen in fig. 2a-b, 3a-b, fig. 3d, fig. 4a-b and fig. 5a-b. The extension mechanism 60 is described in more detail below with reference to fig. 6a-d.

The mattress core 30 comprises the extension mechanism 60. The extensionmechanism 60 is thus comprised in the mattress core 30.

The bed arrangement 10 comprises a groove element 70 configured to runalong the back side 10d of the bed arrangement 10. The groove element 70has a J-shaped profile with an inner leg portion 70a facing the extensionmechanism, an outer leg portion 70b and a bottom portion 70c as illustrated infig. 4b.

The bed arrangement 10 comprises a guide arrangement 80 for guiding thebed arrangement 10 and hence the extension mechanism 60 between thecontracted state and expanded state. The guide arrangement 80 is arrangedin connection to the underside 10b of the bed arrangement. The guidearrangement 80 comprises a guide member pair 80a 80b. The guidearrangement 80 comprises a first guide member 80a and a second guidemember 80b, the first and second guide member 80a, 80b being arranged ata distance from each other and configured to run in the width direction of thebed arrangement 10. The guide arrangement 80 thus comprises a guidemember pair 80a 80b.

The first guide member 80a comprises a first rear guide element 82aconnected to the groove element 70 and a first front guide member 84aconnected to the base 20.

The second guide member 80a comprises a second rear guide element 82bconnected to the groove element 70 and a second front guide member 84bconnected to the base 20.

The guide member pair 80a, 80b thus comprises a rear guide element pair82a, 82b and a front guide element pair 84a, 84b.

The first rear guide element 82a and first front guide element 84a are movablerelative to each other and correspondingly the second rear guide element 82band second front guide element 84b are movable relative to each other.

The first rear guide element 82a and first front guide element 84a are slidablyconnected to each other and correspondingly the second rear guide element82b and second front guide element 84b are slidably connected to each other.

The connection between the respective first and second guide elements 82a,82b, 84a, 84b is according to an embodiment a rail engagement, the first andsecond guide elements 82a, 82b, 84a, 84b comprising rails for slidableengagement.

The first and second front guide elements 82a, 82b are connected to theoutside of the outer leg portion 70b of the groove element 70. The first andsecond front guide elements 82a, 82b are thus arranged to run from theunderside 10b of the bed arrangement 10 to the back side of the bedarrangement 10 as can be seen e.g. in fig. 2b.

The first and second front guide elements 82a, 82b are connected fasteningelements 86a, 86b for fastening the bed arrangement to e.g. a wall. The firstand second front guide elements 82a, 82b are according to an embodimentpivotably connected to the fastening elements 86a, 86b for pivoting the bedarrangement about an axis X running in the length direction of the bedarrangement 10 for raising and lowering the bed arrangement between a raised position for non-use and a lowered position for use.

The guide arrangement 80 comprises an actuator member 88 for manuallyactuating the bed arrangement 10 between the expanded state and thecontracted state. The actuator member 88 is arranged at the front side 10c ofthe bed arrangement 10. The actuator member 88 is connected to the first andsecond guide members 80a, 80b. The actuator member 88 comprises actuatorelements 88a for unlocking the first and second rear guide elements 82a, 82bfrom the first and second front guide elements 84a, 84b for allowing sliding forexpansion/contraction of the bed arrangement 10. The guide arrangement 80thus comprises a locking arrangement for locking the bed arrangement at leastin the expanded state and the contracted state, the locking arrangement beingoperable by means of the actuator elements 88a of the actuator member 88.The locking arrangement is according to an embodiment arranged to lock thebed arrangement in in the expanded state and the contracted state andpositions there between.

Fig. 6a-b schematically illustrates a perspective view and a plan view of anextension mechanism 60 according to an embodiment of the present invention in a contracted state, and fig. 6c-d a perspective view and a plan view of the extension mechanism 60 in the expanded state. See also fig. 5b illustrating the extension mechanism 60 integrated in the bed arrangement 10.

The extension mechanism 60 is intended for adjusting the bed arrangement10 between the expanded state and the contracted state.

The extension mechanism 60 has an upper side 60a and an underside 60b.When the extension mechanism 60 is arranged in the bed arrangement 10,the upper side 60a is arranged to face the padding layer 40 and the undersideis arranged to face the base 20 of the bed arrangement 10. The extensionmechanism 60 further has a front side 60c and a back side 60d opposite to thefront side 60c. When the extension mechanism 60 is arranged in the bedarrangement 10, the front side 60c of the extension mechanism 60 is arrangedto face in substantially the same direction as the front side 10c of the bedarrangement 10 and the back side 60d is arranged to face in the same directionand towards the back side 10d of the bed arrangement.

The extension mechanism 60 comprises rows of interconnected springmembers 62 and rods 64 linked L to the spring members 62 in a para||e|ogramconfiguration. The extension mechanism 60 comprises rows of interconnectedspring members 62 and rods 64 linked to the spring members 62 in a para||e|ogram configuration via links L.

The rows of interconnected spring members 62 and the rods 64 linked to thespring members 62 are pivotable relative to each other at said links to besubstantially parallel in the contracted state and having an angle relative to each other in the expanded state.

The respective spring member 62 comprises arc shaped parts 62a arrangedin said rows with the curved sides facing each other. The respective springmember 62 comprises upper and lower connection parts 62b connecting twoarc shaped parts 62a facing each other with their curved sides forming an anvilprofile. The upper and lower connection parts 62b have a wavy profile. Thespring members 62 comprising arc shaped parts 62b and upper and lower connection parts 62b are connected in rows such that ring shapes are formedby the arc shaped parts 62b of two connected spring members 62. The springmembers 62 are according to an embodiment connected in rows by means of snap fit joints.

The rods 64 are linked to the upper side and lower side of the arc shaped parts 62a of the spring members 62.

The spring members 62 have spring action similar to the spring action of thecoil springs 32a of the pocket spring mattress core 32. The extensionmechanism 60 is configured to provide a similar spring action as the pocketspring mattress core 32. The extension mechanism 60 is configured to providea similar sleeping comfort as the non-extendable spring mattress core 32. Theextension mechanism 60 and the non-extendable spring mattress core 32provides an even pressure distribution over the entire sleeping area.

The extension mechanism 60 is slidably connected to the base 20. As can beseen in fig. 5b, the extension mechanism 60 is connected to the base 20 viafastening members at the underside 60b of the extension mechanism 60. Theextension mechanism 60 is connected to the base 20 via links L at theunderside 60b of the extension mechanism 60, the links L being links arrangedin connection to the front side of 60c of the extension mechanism 60. Theextension mechanism 60 is connected to the base 20 via fastening memberson the underside 60b arranged in connection to the front side 60c of theextension mechanism 60. The extension mechanism 60 is according to anembodiment slidably connected to grooves in connection to the base 20. Theextension mechanism 60 is arranged to slide in the longitudinal extension ofthe base 20 during adjustment of the bed arrangement 10 between thecontracted state and the expanded state of the bed arrangement 10.

The extension mechanism 60 is slidably connected to the groove element 70.The extension mechanism 60 is arranged to slide in the longitudinal extensionof the groove element 70 during adjustment of the bed arrangement 10 between the contracted state and the expanded state of the bed arrangement10. The extension mechanism 60 is connected to the groove element 70 vialinks L of the extension mechanism 60, the links L being links arranged in connection to the back side of 60d of the extension mechanism 60.

The extension mechanism 60 is slidably connected to the inner leg portion 70aof the groove element 70. The inner leg portion 70a of the groove element 70comprises an upper track 72a and a lower track 72b, see e.g. fig. 4a, the tracks72a, 72b running in the length direction of the bed arrangement and hence thelongitudinal direction of the groove element 70 along the inner grove element70a on the side facing the extension mechanism 60. The upper track 72a andlower track 72b constitute a fastening member 72a, 72b. The extensionmechanism 60 is thus slidably connected to a fastening member 72a, 72b of the bed arrangement 10 movable relative to the base 20.

The extension mechanism 60 is thus slidably connected to the base 20 andslidably connected to the fastening member 72a, 72b of the bed arrangement10 movable relative to said base 20. The extension mechanism 60 is slidablyconnected to the base 20 in connection to the front side 60c of the extensionmechanism 60 and slidably connected to the fastening member 72a, 72b ofthe groove 70 in connection the rear side 60d of the extension mechanism 60,wherein the extension mechanism 60 is adjustable between the contractedstate and the extended state by moving the groove element 70 relative to thebase 20 in the width direction of the bed arrangement 10.

The extension mechanism 60 is slidably connected to the tracks 72a, 72b viaconnection elements 65a, 65b. The connection elements 65a, 65b comprisesupper connection elements 65a for slidable connection to the upper track 72aand lower connection elements 65b for slidable connection to the lower track72b. The connection elements 65a, 65b are attached to spring members 62adjacent to the groove element 70. The upper connection elements 65a areconnected to the upper side of the arc shaped parts 62b of the spring members62 and the lower connection elements 65b are connected to the lower side of the arc shaped parts 62b of the spring members 62 adjacent to the groove element 70.

The connection element 65a, 65b are arranged to slide in the tracks 72a, 72bwhen the extension mechanism 60 is moved between the contracted state andthe expanded state.

The bed arrangement 10 comprises means for adjusting the cover layer 50.The cover layer 50 has a front end 50a arranged in connection to the front side10c of bed arrangement 10 and a rear end 50b opposite to the front end 50a.The rear end of the cover layer is arranged in connection to the rear end 10dof the bed arrangement.

The means for adjusting the cover layer 50 comprises a spring arrangement90 connected to rear end 50b of the cover layer 50 such that a spring load isapplied to said cover layer 50 by adjusting the bed arrangement to theexpanded state.

The spring arrangement 90 comprises a first spring member 92 and a secondspring member 94, said spring members being arranged to be compressed inthe expanded state.

The first spring member 92 comprises a first coil spring 92a, a first cylinder 92band a first sleeve member 92c. The first coil spring 92a and the sleeve member92c are arranged around the first cylinder 92b. The first sleeve member 92c ismovable along the first cylinder 92b and guided by the cylinder 92b. The firstsleeve member 92c is arranged to act upon the first coil spring 92a. The firstsleeve member 92c is movable between a first position corresponding to thecontracted position of the bed arrangement 10 and a substantially non-compressed state of the coil spring, and a second position corresponding tothe expanded state of the bed arrangement 10 and thus a compressed state of the coil spring 92a.

The second spring member 94 comprises a second coil spring 94a, a secondcylinder 94b and a second sleeve member 94c. The second coil spring 94aand the sleeve member 94c is arranged around the second cylinder 94b. Thesecond sleeve member 94c is movable along the second cylinder 94b andguided by the cylinder 94b. The second sleeve member 94c is arranged to actupon the second coil spring 94a. The second sleeve member 94c is movablebetween a first position corresponding to the contracted position of the bedarrangement 10 and a substantially non-compressed state of the coil spring,and a second position corresponding to the expanded state of the bedarrangement 10 and thus a compressed state of the coil spring 94a.

The spring arrangement 90 comprises a bar element 96. The bar 96 elementis connected between the first and second spring members 92, 94.

The cover layer 50 is arranged to act upon said bar element 96 duringexpansion to said expanded state, wherein the bar element 96 is arranged toact upon the first and second spring members 92, 94 to compress said springmembers, i.e. compress the coil springs 92a, 94a, during expansion to theexpanded state.

The rear end 50b of the cover layer 50 is connected to the bar element 96.

The inner leg portion 70a of the groove element 70 extends in the upper portionhorizontally to a support portion 74 for supporting the rear portion of the coverlayer 50. The support portion 74 has a curve profile.

The rear end 50b of the cover layer 50 is according to an embodimentconnected to a run 76, wherein an end portion of the cover layer is arrangedto slide against the bar element 96. The cover layer 50 is thus connected tothe bar element 96 via the run 76. The rear end 50b of the cover layer 50 isthus according to this embodiment attached to the run 76. The run 76 could beany suitable element for attaching the cover layer 50, i.e. the rear end 50b ofthe cover layer.

According to an alternative embodiment not shown the rear end 50b of thecover layer 50 could be directly attached to the bar element 96. ln such anembodiment in which the rear end 50b of the cover layer 50 is attached to thebar element 96 the cover layer 50 may act upon the bar element 96 so as tomove the bar element. Alternatively the bar element 96 may be configured asa roll-up device, wherein the cover layer 50 is arranged to act upon the barelement and to be partly rolled up by means of the bar element 96.

Fig. 7a-b and fig. 8a-d schematically illustrates different views of the piece ofpadding layer 40.

The piece of padding layer 40 has an upper side 40a, an underside 40b, a frontside 40c and a back side 40d. The padding layer 40 further has a first shortside 40e and an opposite second short side 40f.

The piece of padding layer 40 comprises perforations 42 distributed over amajor portion of the padding layer 40. The perforations 42 are distributed overthe padding layer 40 so as to allow said piece of padding layer to expand itstotal surface cover in the expanded state.

The perforations 42 have an elongated shape. The elongated perforations 42are extending in the length direction of the bed arrangement 10. The elongatedperforations 42 are distributed in rows where an adjacent row of elongatedperforations 42 are displaced such that the respective elongated perforation inthat row is located such that an imaginary line through the respective elongatedperforation perpendicular to its extension runs between two adjacent elongated perforations 42 in adjacent rows.

The elongated shaped perforations 42 have according to this embodiment theshape of two arcs with their respective ends connected, the curvature of thearcs decreasing in the expanded state.

Fig. 7c schematically illustrates an elongated perforation 42 in the expandedstate. The elongated perforation 42 has a first long side 42a, a second long side 42b facing the first long side 42a, a first short side 42c and a second shortside 42d facing the first short side 42c. The respective long side 42a, 42b hasa curved shape, according to a variant an arced shape, at least in expandedstates. The respective long side 42a, 42b constitute inner walls of theelongated perforation 42. The first long side 42a and the second long side 42bare configured to move away from each other when the bed arrangement 10and hence the padding layer 40 is expanded from the contracted state to theexpanded state. The first long side 42a and the second long side 42b areconfigured to move against each other when the bed arrangement 10 andhence the padding layer 40 is contracted from the expanded state to thecontracted state.

The first long side 42a and the second long side 42b are according to anembodiment configured to at least partly abut each other in the contractedstate.

The elongated shaped perforations 42 constitute through holes at least in theexpanded state.

The elongated shaped perforations 42 have an oval shape.

The padding layer 40 comprises a foam material. The foam material is according to an embodiment foam rubber.

The foregoing description of the preferred embodiments of the presentinvention has been provided for the purposes of illustration and description. ltis not intended to be exhaustive or to limit the invention to the precise formsdisclosed. Obviously, many modifications and variations will be apparent topractitioners skilled in the art. The embodiments were chosen and describedin order to best explain the principles of the invention and its practicalapplications, thereby enabling others skilled in the art to understand theinvention for various embodiments and with the various modifications as are suited to the particular use contemplated.

Claims (11)

1. CLAIIVIS ---- --A variable-size bed arrangement (10) comprising a mattress core (30) and a base(20), which base (20) is adapted to support at least a portion of the mattress core (30),a cover layer (50) arranged to cover the mattress core (30), wherein the bedarrangement (10) is adjustable between an expanded state and a contracted state,comprising means for adjusting the cover layer (50) so as to provide a covering overthe mattress core (30) in both the expanded state and the contracted state of the bed arrangement (10), ' ~ 2 the means for adjusting the cover layercomprises a spring arrangement (90) connected to one end (50b) of the cover layer(50) such that a spring load is applied to said cover layer (50) by adjusting the bed arrangement (10) to the expanded state enaraetertzed in that Qi ---- "Afl-eed--tarrar-tdernert-'i--raeeeifdirtg-"te--ezieiirr---1--,---Wnereän~the spring arrangement (90)eeinnrieee a first snrind rneniber (92). a seeend enrind rnember (94) and a bar element(96) cerinected between the first and second snririci nrernbers :'92 94L ' , , __ twnereiit ut n. ..o.-v-Ä' ...t A e-eirre-râeee--eHear--e~ê-eirtent--(9隧t-,-~said cover layer (50) being arranged to act upon saidbar element (96) during expansion to said expanded statemagd; wherein the barelement (96) is arranged to act upon said firet snrind niernber (92: and seednd dennarnernber (94) to compress said spring member§(92, 94) se as to nrnxride said eprind lead ie said cover layer (50) during expansion to said expanded state. A bed arrangement according to claim 13, wherein said one end (50b) of the cover layer is connected to said bar element (96). â,_A bed arrangement according to claim _13 or _24, wherein said one end of the coverlayer (50b) is connected to a run (76) and arranged to slide against said bar element(96). w.- -arfr-'angeinent-fQriri--ee-rrteifi-eee--e»firat»een-ng---rneirreer-»(92)-end--a--eeeenei--eerirtg--rfrierneer ______ __A bed arrangement according to any preceding claims, wherein the mattress core (30) comprises an extension mechanism (60), said extension mechanism (60)comprising rows of interconnected spring members (62) and rods (64) linked (L) to thespring members (62) in a para||e|ogram configuration to provide a resi|ient mattresscore portion. ~\ \\\\\\ “A bed arrangement according to c|aim ål, wherein the rows of interconnectedspring members (62) and the rods (64) linked to the spring members (62) are pivotablerelative to each other at said links (L) to be substantially parallel in the contracted stateand having an angle relative to each other in the expanded state. .~~ -x bed arrangement according to c|aim 552 or gå, wherein the rows ofinterconnected spring members (62) are mutually parallel and the rows of rods (64)are mutually parallel in the expanded state as well as the contracted state. bed arrangement according to any of claims 41-60, wherein said extensionmechanism (60) is slidably connected to said base (20) and slidably connected to afastening member (72a, 72b) of said bed arrangement (10) movable relative to saidbase (20). bed arrangement according to any preceding claims, further comprising apiece of padding layer (40) arranged between the mattress core and the cover layer(50), the piece of padding layer (40) comprising perforations (42) distributed over atleast a portion of the padding layer (40) so as to allow said piece of padding layer (40) to expand its total surface cover in the expanded state. ¿.“N_A bed arrangement according to c|aim _64, wherein said perforations have an elongated shape. bed arrangement according to c|aim gi, wherein said elongated shapedperforations have the shape of two arcs with their respective ends connected, the curvature of the arcs decreasing in the expanded state. vehicle (1) comprising a bed arrangement (10) according to any of claims 1; 1