A - Human Necessities – 01 – C
Patent
A - Human Necessities
01
C
A01C 7/08 (2006.01) A01B 61/04 (2006.01) A01C 5/06 (2006.01) A01C 7/00 (2006.01)
Patent
CA 2182631
A ground following opener comprises a support frame (20), a parallelogram arrangement (B, C, D and E) pivotably attached at (D) to the support frame, a tyne shank (14) supported by the parallelogram means at (C, B), and an opener means (10) supported at a free end of said tyne shank (14). The pivot at D is arranged to allow rotational movement of the parallelogram independent of the frame (tripping) so that the opener can pass over the surface of an obstacle in the ground. Furthermore, a ground following means (16) is attached to the tyne or the arm of the parallelogram to which it is attached. A single bias means (32) is pivotably attached at one of its ends to the supportframe (20) and also pivotably attached at its other end to an arm of the parallelogram so that the single bias means urges the opener means into the ground as well as biasing the return of the parallelogram, tyne, ground followerand opener means towards the ground after they have been rotated independent of the frame when the opener passes over the surface of an obstacle in the ground. To assist the operation of the invention the point of pivot of the biasing means to the parallelogram is offset from the axis of the pivotable attachment between arms of the parallelogram.
Fetherstonhaugh & Co.
Techsearch Incorporated
LandOfFree
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