Roller carriage arrangement for a door or a window of a building having a fixed frame and a leaf which is displaceable relative to the fixed frame

A roller carriage arrangement for a door or a window of a building, wherein the window or the door has a fixed frame and a leaf which can be released from the fixed frame and which can be displaced relative to the fixed frame, and wherein the roller carriage arrangement comprises following:

• a first roller carriage having a single-piece roller carriage housing;
• a first roller, a second roller and a third roller which are arranged in series in the roller carriage housing and which are configured to be rolled together on a sliding rail of the fixed frame,
• a first coupling rod, and
• a second roller carriage that is connected indirectly or directly via the first coupling rod to the first roller carriage,
• wherein the first roller carriage has a first deployment arm and a second deployment arm which are each pivotably arranged in a region of first ends thereof on the roller carriage housing and which, in a region of second ends thereof which are opposite the first ends, can be connected indirectly or directly to the leaf in order to discharge a leaf load,
• wherein the first deployment arm is arranged on the roller carriage housing between the first roller and the second roller, and wherein the second deployment arm is arranged on the roller carriage housing between the second roller and the third roller.