Trolley-type conveyance device

A carriage-type conveying apparatus comprising:

• a conveying carriage provided with an elevatable workpiece support base and an elevating drive means to vertically drive the workpiece support base;
• a workpiece support height changing position set on a traveling path of the conveying carriage and, when the conveying carriage passes through the workpiece support height changing position, the elevating drive means being operable to change a height of the workpiece support base;
• a power source carriage provided aside of the traveling path of the conveying carriage at the workpiece support height changing position said power source carriage being reciprocable along the traveling path;
• a synchronization drive means provided aside of the traveling path of the conveying carriage at the workpiece support height changing position to make the power source carriage travel synchronously with the conveying carriage;
• the conveying carriage having a passive shaft interlocked with a driving shaft of the elevating drive means;
• and having
• a locking means to prevent descent of the workpiece support base while the passive shaft does not receive a torque;
• the power source carriage having a transmission shaft acceptable to transmit a torque to the passive shaft;
• a power source operable to rotationally drive the transmission shaft;
• and
• a separable interlocking means to interlock the passive shaft and the transmission shaft with each other in a state where the conveying carriage and the power source carriage synchronously travel.