The invention relates to an expansible and contractible work room on a chassis supported by wheels, of the kind that is seen in the preamble of claim 1.

Such work rooms are at least partly known from, for instance, WO 96/13402, WO 98/18667, US-A-4912892, EP-O- 742119-A1, or US-A-5291701.

In a construction of the kind that is seen in the preamble of claim 1, there is a problem with partition walls that extend transverse to longitudinal direction/driving direc- tion of the chassis and that in the expanded state bridge over the lateral limits of the basic structure. The problem is associated with the fact that these transverse partition walls have to be foldable around an axis at either side edge, into a position, wherein the wall becomes generally parallel to and located next to either the bottom of the box or a fixed longitudinal structure in the central longi¬ tudinal intermediate area of the basic structure, so that the box can be pushed into the basic structure into a posi¬ tion, wherein the bottom of the box substantially coincides with the vertical side wall of the basic structure. Natu¬ rally, upon such turning of the partition wall, no annoying interferences must occur between the partition wall upon the folding thereof to and from operational position. Yet the partition wall has to be formed in order to be able to offer a substantially tight screening against the top wall of the box and/or the top wall of the basic structure.

Furthermore, the floor of the work room should form a sub¬ stantially planar and continuous surface in the expanded state of the work room, and furthermore allow the travers¬ ing motions of the boxes between the two end positions thereof. Therefore, an object of the invention is to provide a work room by means of which said drawback entirely or partly is obviated.

The object is attained by the invention.

The invention is defined in the appended claim 1.

Embodiments of the invention are defined in the appended dependent claims, and in the following description of a preferred embodiment of the invention.

Fig. 1 schematically shows a planar view of a mobile work room according, to the invention in the expanded state.

Fig. 2 shows a section taken along line II-II in fig. 1.

Fig. 3 shows a section corresponding to fig. 2 in the contracted state of the room.

Fig. 4 schematically shows a perspective view from above of the object of fig. 1.

Fig. 1 illustrates schematically a work room, which in the example constitutes a medical mobile district health centre that is constructed on a trailer chassis. The room com¬ prises a substantially orthogonal parallelepipedic basic structure 1, the.elongate vertical side walls of which have openings that sealingly receive laterally-positioned boxes 2, 3. The boxes are each substantially orthogonally paral¬ lelepipedic and have an open side facing the interior of the structure 1. The boxes have an outer vertical side wall 21 and 31, respectively, which in the contracted state of the room substantially coincide with the side wall surfaces of the basic structure 1, and in the expanded state are parallel to the side walls of the structure 1, but located at a distance outside these, as is seen in fig. 1. In the respective box 2, 3 there are partition walls 4, 5, 6 and 7, 8, 9, 10, respectively, which contain wall portions 41, 51, 61, which are turnable around a laterally-positioned 5 vertical axis, which also applies for the walls 7, 9, 10 and 8.

From fig. 1, it can be understood that the front and rear •' end walls of the boxes 2, 3 project into each other in the 10 contracted state of the boxes 2, 3, and that at least the walls 9, 10, 4, -5 have an extension in the transverse direction that is larger than the traversing direction of the boxes 2, 3. Furthermore, it can be seen that fixed structures 30, 31, 33 are mounted in a longitudinal central 15 intermediate portion of the structure 1 and contain, for instance, discharge sinks including hydraulic fittings and sewers. At least the walls 4 and 5 extend up to these fixed structures. For that sake, at least the wall parts 4, 5, on the wall portions 41, 51 thereof, are turnable around said 20. axes that may be located close by the fixed central struc¬ tures, between the position shown in fig. 1, into a posi¬ tion wherein they extend substantially parallel to the lon¬ gitudinal direction of the basic structure 1, so that the partition walls 4, 5 do not block the insertion of the box 25 2 into the basic structure 1. Concerning the box 3, it can be seen that the smaller transverse partition walls 9, 10 of the box 3 do not extend all the way up to the fixed cen¬ trally located structures, but that the partition wall structures 7, 8, 101, 91 are correspondingly arranged fpld- 30 able around vertical axes in order to be foldable away from the positions shown in fig. 1 so that they lie directed in the longitudinal direction of the basic structure, and near the outer side wall 31 of the box 2, so that the box 3 also can be inserted into the retracted position thereof, 35 wherein the wall 31 substantially coincides with the side wall of the basic structure 1. In that connection, at least the walls 4, 5 have an upper horizontal wall portion 51, 52, which is turnable around a horizontal pivot in the plane of the partition wall. Refer¬ ence being made to fig. 2, where it can be seen that the hinge 53 lies on the level of the upper limitation of the fixed structure, and at a distance below the rear wall 22 of the box 2, the wall elements 51, 52 having a height cor¬ responding to the distance between the hinge 53 and the inside of the rear wall 22 in order to fill out this gap. Since the shown elements 51, 52 suitably also should extend in over the fixed structure up to the far end wall surface thereof, which defines the side wall of the shown corridor, the wall elements 51, 52 are mutually turnably connected via a vertical hinge between nearby side edges thereof, in the embodiment example, the horizontal hinge 53 solely extending along the horizontal length of the element 51 in order to allow the element 52 to be folded inwards towards the element 51.

Between the ceiling of the basic structure 1 and the upper verge of the ceiling elements 51, 52, a screening element 63 is provided, which may be foldingly connected via a hinge to the ceiling surface of the basic structure 1, as is illustrated in fig. 2.

In fig. 2, it is further shown that the corridor wall 71 of the fixed structure, at the upper edge thereof, has a wall element 72, which ■is foldable around a hinge 73 between a position, wherein the element 72 is lowered against the wall 71 and raised, respectively, and extends upward from the hinge 73 in order to define the corridor space to the left in fig. 2.

From fig. 1, it can further be understood that the wall part 91 is foldable around a vertical axis indicated by a circle, the wall 8 being articulately connected to the inner end of the wall part 91 and being releasable from the wall 10 in order to be foldable into positions that are parallel to and located near the wall 31. Correspondingly, the wall 7 can be folded-in around a pivot into a position parallel to and near the corridor wall of the fixed struc- ture. The partition wall part 91 is also turnable 90° from the position according to fig.' 1, in order to, with the box 3, be inserted into the basic structure 1 into the indi¬ cated position.

From figs.- 2 and 3, it can further be understood that the basic structure 1, and the boxes 2, 3 have a floor that is . in a common plane, in the expanded state of the room, the floor on each side of the fixed structure comprising two equally wide portions 81, 82 and 91, 92, respectively, which are inter-linked via a horizontal pivoting hinge and have the spaced-apart edges thereof connected to fixed floor parts in the structure 1 and the respective box 2, 3 so that the floor plates 81, 82 as well as the floor plates 91, 92 can be folded upward and toward each other into the configuration shown in fig. 3, around the hinges 83-85 and 93-95 thereof, into a space that is left between the fixed structures and the folded partition walls, in the con¬ tracted state of the room (fig. 3) .

In fig. 1, the front end of the trailer is indicated by 7.