Sliding window or sliding glass door

Sliding window or sliding glass door having a fixed frame and, in this frame, at least one glazed panel which cooperates with guiding members mounted on the frame and guiding the glazed panel so as to move along the said frame in a longitudinal direction, in which the said glazed panel has at least one lower longitudinal border and is equipped on said at least one lower longitudinal border with a rigid reinforcing member which has, projecting from the border, two opposing symmetrical edges defining a longitudinal channel in this reinforcing member, and in which the said guiding members have several fixed guides equipped with respective centering elements engaged in the said channel and being configured so as to permit a lateral deflection of said centering elements inside said channel perpendicular to said longitudinal direction, wherein the said guides are assemblies independent to and intercalated, along the sliding direction of the glazed panel, between slide support units with rollers mounted on a lower side of the frame and forming part of the said guiding members, wherein a lower side of the frame has a longitudinal covering profiled part with an inverted U-shaped profile placed on two seats of an assembly of two profiled parts forming the structure of a lower element of the frame, the guides being fixedly attached to this covering profiled part by transverse pins, these pins being perpendicular to a vertical plane of symmetry of the glazed panel.