Track for sliding closure

A track assembly for a sliding closure member comprising a track extending in a longitudinal direction and a support arm mounted at one end in the track for traveling movement along the track by a connecting means which retains the arm generally perpendicular to the track during part of the traveling movement and permits rotation of the arm about an axis perendicular to the common plane of the track and arm in one end region of the track,

• control means engageable with the connecting means when the arm is in the end region of the track for effecting a rolling movement of the arm along the track in the said common plane, the control means for effecting the rolling movement of the arm comprising a rack which is fixed relative to the track at least when the connecting means is in the end region of the track, the rack being engageable with a pinion portion of the connecting means, the connecting means comprising a ball roller mounted on the arm for rolling movement along the track when the arm is generally perpendicular to the track while permitting rotation of the connecting means about the axis perpendicular to the common plane of the arm and the track, and holding means engageable with the connecting means to prevent such rotation when the connecting means is not positioned in the end region of the track.