Abstract: A chair arm-rest comprises a rear portion secured to the supporting structure of the arm-rest, and a front portion which is pivotally mounted to the rear portion around an axis substantially parallel to the longitudinal direction of the arm-rest and adapted to assume two different operative positions which are spaced from each other by about 180.degree.. The articulation axis is offset towards one side of the rear portion of the arm-rest, so that in one of said two operative positions the front portion projects towards the inner side of the arm-rest with respect to the rear portion, so as to provide adequate support for the arm of the occupant when the latter must perform an operation at the keyboard of a typewriter or a computer.

Abstract: A chair arm-rest, particularly for an office chair, includes a supporting structure and an arm-rest structure movable relative to the supporting structure by movement of a user's forearm resting on the arm-rest between a shortened condition and a forwardly extended condition, in which the arm-rest can support the user's forearm better, for instance when performing a typewriting operation.

Abstract: The sofa according to the invention can be converted into bed by drawing forwardly the supporting structure until it reaches an elongated condition in which the mattress lies down thereon. In the retracted condition for use as sofa, the mattress is folded under the supporting structure.