Shaft assembly safety mechanism

A shaft coupling element comprising:

• a first portion configured for connection to a shaft having a bolt receiving recess and a second portion configured for connection to a secondary component;
• the first portion comprising first and second spaced apart side walls with a partial cylindrical portion extending therebetween to define a shaft receiving slot, the shaft receiving slot having an axial direction and having an axial opening into the shaft receiving slot and the partial cylindrical portion having opposite ends in the axial direction;
• a through bore extending through the first and second walls for receiving a bolt extending through the through bore in the first and second walls and engaging the bolt receiving recess when the shaft is completely inserted into the shaft receiving slot;
• and
• a safety notch extending entirely through one of the opposite ends of the partial cylindrical portion adjacent the axial opening into the shaft receiving slot so as to define a radial opening extending from the shaft receiving slot entirely through the cylindrical portion in a direction transverse to the axial direction, such that the shaft can pass through the radial opening in a radially outward direction when the shaft is not completely inserted into the shaft receiving slot, such that the bolt is not in engagement with the bolt receiving recess.