Patent ID: 7059257

Claim:
A seeding-knife assembly, compromising a body-member and a replaceable tip-member, wherein: the assembly comprises a knife having an angled blade assembly; the body-member includes a body-over-surface and a body-under-surface, which intersect at a line, and the line defines a body-knife-edge; the tip-member includes a tip-over-surface and a tip-under-surface, which intersect at a line defines a tip-knife-edge; the shapes of the body-member and the tip-member, and the arrangement of the assembly, are such that: (a) the body-knife-edge terminates at a lower extremity thereof, and the tip-knife-edge terminates at an upper extremity thereof; (b) the lower extremity of the body-knife-edge is contiguous with, and co-linear with, the upper extremity of the tip-knife-edge; (c) the tip-over-surface is a continuation of the plane of the body-over-surface, and the tip-under-surface is a continuation of the plane of the body-under surface; the body-member, as viewed in cross-section at right angles to the body-knife-edge, is generally triangular in form, the three sides of the triangle being the said body-over-surface, the said body-under-surface, and a body-back-side of the body member; the tip-member, as viewed in cross-section at right angles to the tip-knife-edge, is generally triangular in form, the three sides of the triangle being the said tip-over-surface, the said tip-under-surface, and the tip-back-side of the tip-member; the triangular form of the body-member is substantially identical to the triangular form of the tip member; a first one of the members includes a spline, and the other includes a complementary socket; the spline and socket are complementarily shaped such that the tip-member is engaged on the body-member and, is thereby held constrained against all modes of rotational movement relative to the body-member, and the spline is prism-shaped having the same general triangular-shaped form as a cross-section of the first member; the assembly includes an operable release mechanism; the release mechanism is effective to hold the tip-member fully engaged on the body-member, and, when operated, is effective to release the tip-member from the body-member.