Patent ID: 8651025
Filing Date: 2014-02-18
Classification: E01B,H01L

Abstract:
1. An overhead wafer transport system comprising: an overhead transportation (OHT) rail including a main track and two lateral tracks, each having a hollow transverse cross-section, each lateral track being in corresponding connection with the main track through the two respective sides thereof; and a shuttle having a track-interface assembly and a docking unit, wherein the track-interface assembly is adapted to travel along the OHT rail and includes a frame structure, three pairs of main wheels and four pairs of branching wheels, wherein the frame structure is substantially H-shaped and includes a vertical bar coupled between two horizontal bars; wherein the four pairs of branching wheels are correspondingly arranged on the two horizontal bars with a predetermined distance in between; wherein when the shuttle travels toward a junction of the two lateral tracks and the main track, the track-interface assembly is adapted to selectively travel along at least one of the main track and the lateral tracks.