Improved shear bolt coupling.

摘要

A shear bolt coupling (48, 58, 52) incorporated in a drive transmission (49) of an agricltural baler (10) comprises : a first rotatable member (48); a second rotatable member (52) coaxial with the first member (48); a shear bolt (58) operatively interconnecting the first and second rotatable members (48 resp. 52) for, during normal operation, rotatably transmitting power therebetween and arranged to shear off under excessive load conditions for interrupting said power transmission and permitting the first and second members (48 resp. 52) to move relative to each other; and shear bolt introducing means (60/77) operatively associated with either the first or second rotatable member (48 resp. 52) for urging a shear bolt (58) into a drive engaging position. Said shear bolt introducing means (60/77) are movable, relative to the rotatable member (either 48 or 52) with respect to which they operatively are associated, between : an inoperative position clear of the shear bolt introducing area of said rotatable member (either 48 or 52) for enabling the insertion of a new shear bolt (58) in said member (either 48 or 52); and an operative, shear bolt engaging position for urging a newly inserted shear bolt (58) towards a coupling position in which the drive transmitting coupling between the first and second rotatable members (48 resp. 52) is re-established.