Abstract: A flat sliding door unit comprising a main rail extending in the right and the left directions along the upper door frame; swing arms provided aside the main rail and supported by the upper door frame or an extension thereof; sliding doors, each of which is provided with a pair of rollers to be shifted along the main rail and secured to upper both ends of the sliding door; wherein the swing arm is provided with an engaging pin at the tip thereof; a hook member to detachably engage the engaging pin and extending from the roller stay disposed on the leading end in the opening direction of the sliding door; an opening part of the hook member being directed in a fixed direction so as to depart from the engaging pin when the sliding door is slid along the main rail in the opening direction; the sliding door being retained in the closure position when the hook member engages the engaging pin; and, upon swinging of the sliding door to one side, the swing arm swings to shift the roller retaining the swing arm to a do

Abstract: A flat sliding door unit comprising an upper suspension secured to the upper frame on the front of a furniture, a lower suspension secured to the lower frame on the front, and a pair of sliding doors disposed on the right and left sides and supported by the suspensions, the upper suspension comprising a straight rail extending in the right and left directions, a pair of side rails disposed on the right and left sides and extending rearwardly from the central part of the straight rail, and a pair of pointers for switching the door path from the straight rail to side rails, the lower suspension comprising a straight rail extending in the right and left directions, a side space formed to extend rearwardly from the central part of the straight rail, and side paths formed to extend obliquely rearwardly from both ends of the straight rail, and, the right- and left-hand sliding doors each being provided, at both lower ends, with a pair of lower sliding bodies to slide along the rail of the lower suspension and, furt