Patent ID: 8516656

Claim:
A combination castor comprising: a control unit; a linking unit connected with the control unit; and at least two castor units connected with the linking unit; wherein the control unit includes: at least one mounting seat; at least one bushing mounted in the at least one mounting seat and having an interior provided with a mounting hole; and a pedal pivotally mounted on a side of the at least one mounting seat and having an interior provided with a driving hole aligning with the mounting hole of the at least one bushing; the linking unit includes: a propeller shaft extended through the mounting hole of the at least one bushing and combined with the driving hole of the pedal; at least one rotation plate secured on the propeller shaft and rotatable in concert with the propeller shaft; and at least two links each having a first end pivotally connected with the at least one rotation plate and a second end pivotally connected with a respective one of the at least two castor units; wherein the mounting hole of the at least one bushing has a hexagonal shape and is fitted onto the propeller shaft of the linking unit; the propeller shaft of the linking unit has a hexagonal shape; the driving hole of the pedal has a hexagonal shape and is fitted onto the propeller shaft of the linking unit.