Coupling device for a power transmission shaft

A device for releasably coupling a power take-off shaft of a tractor to a transmission shaft of a trailer towed by said tractor, said device comprising a coupling hub, means drivingly mounting said hub on said power take-off shaft, a coupling drum co-axially surrounding and spaced from said hub, said drum being substantially fixed relative to said tractor, a pivot support mounted on an outer surface of said drum, a coupling sleeve drivingly mounted on said transmission shaft, a first arm having a first end, means for pivotally connecting said first end to said sleeve, an actuating member non-rotatably connected to the other end of said first arm, a second arm having a first end non-rotatably connected to said actuating member, the other end of said second arm extending from said member whereby when said actuating member is positioned on said pivot support, pivotal movement of said second arm about the axis of said support will move said sleeve to a position co-axially between said hub and said drum for driving engagement with said hub, and quick-release fastener means for detachably connecting said sleeve to said hub when in said engagement.