vertical shaft 4 the location of the stops 6 a 6 b in the sliding rail 5 is defined such that the edge of the first work surface 1 is adjacent to the near leg 8 a 8 b without contact when the shaft 4 is in stopped position the length of the first work surface 1 is determined such that in stowed position with the shaft 4 stopped the second end 12 of the first work surface 1 does not come into contact with the near leg 8 a 8 b during its deployment fig1 c illustrates a configuration of the office device with a parallelepipedal storage container placed on the floor under the work surfaces 1 2 one end of the container 13 is fixed to a leg 8 b of the arch while the other end is distant from the other leg 8 a of the arch this container 13 leg 8 a distance creates a free storage space for the base 7 of the first work surface 1 the first work surface 1 is rotatable in relation to the axis marked by the vertical shaft 4 located in the transverse medial plane of the container 13 this vertical axis 4 slides in a sliding rail 5 worked in the upper surface 14 of the container 13 in the longitudinal direction consequently the first work surface 1 is also displaceable along the longitudinal axis of the rail 5 whether the first work surface 1 is stowed or deployed the access to the storage container 13 as well as access to the second work surface 2 remains easy fig2 to 4 represent the various possibilities of deployment and adjustment.