No till seed drill

Claim 2

A tractor drawn no till seed drill for planting seeds in previously harvested plots that have not since been tilled with the seeds being evenly spaced along a furrow formed in the stubble ground, while moving in a forward direction, comprising: a wheel supported framework; a hopper on said framework for receiving seeds in bulk; a seed delivery tube extending downwardly from said hopper to an open end; a coulter disc operatively connected to said framework for rotation about a first axis; a furrow opening disc operatively connected to said framework for rotation about a second axis inclined to and rearward of said first axis with said furrow opening disc tangentially engaging said coulter disc at a point of convergence elevationally below said first and second axes; and wherein said seed delivery tube open end is located directly above said point of convergence.

Claim 3

The seed drill as recited in claim 1 further comprising a clevis member pivotably mounted at one end to the framework and rotatably mounting said coulter disc and furrow opening disc at a remaining bifurcated end between the furcations thereof; cylinder means connecting the clevis member and frame selectively operable through a pressure supply to exert a downward force on the clevis member and to thereby urge the discs downwardly.

Claim 4

The seed drill as recited in claim 2 wherein a plurality of pairs of coulter discs and furrow opening discs are mounted by a like number of clevis members to said framework and wherein said cylinder means is comprised of a double acting hydraulic cylinder for each clevis member with said cylinders being connected in a parallel hydraulic circuit to a common pressure supply so equal force is exerted against each clevis member.

Claim 5

The seed drill as recited in claim 3 wherein the plurality of pairs of coulter discs and furrow opening discs are staggered with alternate pairs forward of the remaining pairs.

Claim 6

The seed drill as recited in claim 1 wherein said coulter disc and furrow opening disc are mounted between furcations of a clevis member having one end pivotably mounted to said framework; wherein said first and second axes are inclined relative to each other so the coulter disc and furrow opening disc converge forwardly and downwardly and diverge rearwardly and upwardly so said point of convergence is located forward of said first and second axes; and a fertilizer hopper mounted to the framework having a fertilizer discharge tube leading therefrom to a discharge point rearward of the seed delivery tube open end.

Claim 7

The seed drill as recited in claim 1 wherein one of said discs includes an annular flange of a diameter less than the diameter of the furrow opening disc for regulating furrow depth.

Claim 8

The seed drill as recited in claim 5 wherein a plurality of pairs of coulter discs and furrow opening discs are provided along with a like number of clevis members mounted to the framework such that alternate pairs of coulter discs and furrow opening discs are located forward of the remaining pairs of coulter and furrow opening discs.

Claim 9

In a seed drill of the type having a wheel supported frame, a hopper on the frame for receiving seeds in bulk and a seed discharge tube leading downwardly from the hopper to an open end; a seed planting assembly comprising: a clevis member having one end thereof pivotably mounted to the framework and a bifurcated end extending rearwardly therefrom; a coulter disc rotatably mounted to one of the furcations of the clevis member for rotation about an inclined first axis; a furrow opening disc rotatably mounted to a remaining furcation of the clevis member for rotation about an inclined second axis rearward of the first axis so the coulter disc and furrow opening disc diverge upward and rearwardly of the axes and converge downward and forwardly of the axes and come into tangential contact at a point of convergence below the axes; wherein the open end of the seed discharge tube is located directly above the point of convergence; and cylinder means connecting the clevis member and framework operated through a pressure supply to exert a downward force against the clevis member and thereby urge the coulter disc and furrow opening disc downwardly.

Claim 10

In a seed drill of the type having a wheel supported frame, a hopper on the frame for receiving seeds in bulk and a seed discharge tube leading downwardly from the hopper to an open end; a seed planting assembly comprising: a clevis member having one end thereof pivotably mounted to the framework and a bifurcated end extending rearwardly therefrom; a coulter disc rotatably mounted to one of the furcations of the clevis member for rotation about an inclined first axis; a furrow opening disc rotatably mounted to a remaining furcation of the clevis member for rotation about an inclined second axis rearward of the first axis so the coulter disc and furrow opening disc diverge upward and rearwardly of the axes and converge downward and forwardly of the axes and come into tangential contact at a point of convergence below the axes; wherein the open end of the seed discharge tube is located directly above the point of convergence; and cylinder means connecting the clevis member and framework operated through a pressure supply to exert a downward force against the clevis member and thereby urge the coulter disc and furrow opening disc downwardly.

Claim 11

In a seed drill as recited in claim 8 wherein a plurality of pairs of coulter discs and furrow opening discs are provided and mounted to a like number of clevis members; the clevis members being pivotably mounted to the framework in staggered relation so alternate pairs of coulter discs and furrow opening discs are located forward of the remaining pairs; and the cylinder means comprises a hydraulic cylinder for each clevis member connected between the clevis member and the framework, the hydraulic cylinders being connected to one another and to a common pressure supply in a parallel hydraulic circuit so that equal downward force may be applied against each clevis member.

Claim 12

In a seed drill as recited in claim 8 wherein the point of convergence is located forward of the first and second axes; and an annular flange mounted coaxially to one of the discs of each pair for preventing furrow formation beyond a desired depth.