Abstract: An adjusting assembly for mounting a supporting tray assembly to a chair using one or more arm assemblies. The proximal end portion of a mounting bar is secured to a chair such that the mounting bar is disposed substantially horizontally. A substantially vertically disposed support assembly is mounted from the distal end portion of the mounting bar, and the support assembly may be rotatable about a vertical axis, if desired, to facilitate entering and exiting the chair. If only one arm assembly is used, the first end portion of an arm assembly is supported for articulation from the pivot assembly, and a tray assembly is pivotally supported from the second end portion of the arm assembly. If two or more arm assemblies are utilized, each arm assembly has a housing with first and second end portions.

Abstract: An adjusting device embodying the concepts of the present invention is incorporated in a mount by which a tray assembly adapted to support an input device for a computer is supported from a chair. The proximal end portion of a mounting bar is supported from a chair such that the mounting bar is disposed substantially horizontally from the chair. A substantially vertically disposed support assembly is rotatable mounted from the distal end portion of the mounting bar. The first end portion of an arm assembly is supported for articulation from the pivot assembly about an articulating axis that is disposed substantially horizontally. A tray assembly is pivotally supported from the second end portion of the arm assembly about an pivotal axis that is disposed substantially horizontally. Means may be provided selectively to establish the distance between the mounting bar and the articulating axis.