Patent ID: 9408338
Filing Date: 2016-08-09
CPC Classification: A01B

Claim Text:
1. A disc assembly for use with a vertical tillage implement having a main frame supporting a plurality of tillage units thereon in which each tillage unit includes a disc supporting arm mounted on the main frame, the disc assembly comprising: a shaft arranged to be mounted on the disc supporting arm of a respective one of the tillage units; a hub supported on the shaft such that the hub is rotatable about a longitudinal axis of the shaft, the hub including: an end plate mounted fixedly on the shaft so as to substantially enclose the inner end of the annular body portion, the end plate including an annular tongue portion protruding axially from an interior side of the end plate so as to be matingly received within the annular groove between the first and second annular flange portions for relative rotation therebetween; wherein there is provided a clearance gap between the annular tongue portion and the annular flange portions, that includes a U-shaped portion about the annular tongue portion, in which the annular tongue portion and the annular flange portions remain open and unobstructed therebetween along a full length of the clearance gap in axial and radial directions of the clearance gap from an exterior opening at an outer end of the clearance gap to an inner end of the gap which is open to a hollow interior of the annular body portion.