Overhead hoist transport system

An overhead hoist transport system comprising:

• a driving rail extending in a first direction;
• a pair of support rails extending in the first direction and being spaced apart from each other in a second direction perpendicular to the first direction, wherein the driving rail is disposed in a space between the pair of support rails;
• and
• a crane movably connected to the driving rail and the support rail and configured to move along the driving rail and the support rail,
• wherein the crane includes:
• a base extending lengthwise in the second direction and crossing the driving rail and the pair of support rails;
• a driving wheel connected to the base and configured to move along the driving rail;
• a bogie including at least one bogie shaft, wherein the bogie is configured to tilt about the at least one bogie shaft;
• and
• a support connected to the base and the bogie and configured to tilt about the at least one bogie shaft,
• wherein the support includes a pair of guide wheels configured to move along the pair of support rails, and
• wherein the pair of guide wheels are configured to be pressed toward the pair of support rails to maintain contact between the pair of support rails and the pair of guide wheels.

An overhead hoist transport system comprising:

• first and second support rails provided along a ceiling in a factory and extending parallel to each other in a first direction;
• a driving rail positioned between the first support rail and the second support rail;
• and
• a crane movably connected to the first support rail, the second support rail, and the driving rail to move along the first support rail, the second support rail, and the driving rail,
• wherein the crane includes:
• a base extending lengthwise in a second direction perpendicular to the first direction and crossing the first support rail, the second support rail, and the driving rail, wherein the base includes an auxiliary rail extending in the second direction;
• a carriage movably connected to the auxiliary rail and configured to move in a third direction perpendicular to the first and second directions;
• a driving wheel connected to the base and configured to move along the driving rail;
• and
• a support including:
• a bogie including at least one bogie shaft and connected to the base;
• and
• a pair of guide wheels connected to the bogie and configured to be tiltable about the at least one bogie shaft and to move along the first support rail and the second support rail, respectively, and
• wherein the pair of guide wheels are configured to be pressed toward the first support rail and the second support rail to maintain contact with the first support rail and the second support rail, respectively.