Rotary cultivator hub blade connection - is polyhedral and prevents the hub from axial displacement from star shape blade

摘要

The part joining the hub and the piece inserted in it is a regular triangle in cross-section with rounded corners and with convexly - curved side edges. The polyhedral part, together with the hub, is made of plastic in one piece. The hub is pinned to and supported by double ball races. The blades are made of separate blades attached by rivets or by bolting to a flanged bush on the shaft, and pinned to the shaft or the assembly may have a single straight piece bent for forming cutting edges secured at the centre.