Title: Safety clutch device

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Abstract: A clutch or coupling device for interconnecting a drive shaft to an axially aligned driven shaft which supports drive sprockets for chain belt conveyor of a press characterized by a disk member connected to the drive shaft for rotation therewith and having a plurality of recesses which have converging planar side walls and are circumferentially spaced on a circle coaxial with the axis of the drive shaft to receive circumferentially spaced dogs which have slanting plane surfaces extending substantially parallel to the side walls of the grooves and are mounted on a flange member which is connected by a mounting device to the driven shaft. The mounting device directly transfers rotational motion between the flange member to the driven shaft but enables relative axial movement of the flange member from a first position with the slanting plane surfaces of the dogs engaged with the side walls of the recesses to transfer torque between the shaft to a second position with the slanting plane surfaces withdrawn from engagement and includes a spring device for biasing the flange member to the first position. In operation, when an overload occurs, the increased torque acting on the engaged slanting surfaces of the dogs and recesses overcomes the force of the spring device and urges the flange member axially to the second position to disengage the coupling between the drive shaft and driven shaft.


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