Seed drill having parallel guide means for the movable shank

Details Seed drill having parallel guide means for the movable shank Seed drill having parallel guide means for the movable shank

1977-09-02

1980-06-24

Burr, Edgar S.

Planting

Drilling

Lister units

111 61, 111 66, 111 86, 172484, 172725, A01C 506, A01C 720

Patent

active

042089743

ABSTRACT:
A seed drill (FIG. 1 ) having a frame (1 ) with knife hoes (7 ) mounted thereon. The knife hoes are movable in a vertical plane and each has two laterally projecting wings (8 ) bent downwardly toward one another; the outer edges of the wings merge forwardly together to form a point. Each knife hoe has an upright strut (13 ) supporting the leading point of the knife. Further, each knife hoe is disposed on a shank (9 ) which is mounted on the frame with parallel guide means (10 ). The parallel guide means has at least one articulation (19 ) acting in a vertical plane, a stop (21 ) limiting forward swinging movement of the knife hoe about the articulation, and at least one resilient element (22 ) exerting a force on the knife hoe in the direction of the stop. The drill further includes a gauge wheel (16 ) for each knife hoe to limit the depth of penetration of the knife hoe into the soil.

REFERENCES:
patent: 77924 (1868-05-01), Shreiner
patent: 292404 (1884-01-01), Bradford
patent: 404853 (1889-06-01), Mast
patent: 421501 (1890-02-01), Johnson
patent: 424240 (1890-03-01), Wise
patent: 652513 (1900-06-01), Friend
patent: 662823 (1900-11-01), Rhodes
patent: 719272 (1903-01-01), Steep
patent: 939595 (1909-09-01), Gale et al.
patent: 1574917 (1926-03-01), Mitchell
patent: 1993169 (1935-03-01), Hazard
patent: 2239918 (1941-04-01), Kriegbaum
patent: 2713836 (1955-07-01), Ajero
patent: 3177830 (1965-04-01), Zimmerman
patent: 3797418 (1974-03-01), Bridger, Jr.

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