Rotary or active harrow

Details Rotary or active harrow Rotary or active harrow

1992-10-02

1994-10-18

Crowder, Clifford D.

Earth working

Axis of rotation of wheel lockable or angularly adjustable

172385, 1724452, 172543, 172548, 172556, A01B 2104, A01B 2300

Patent

active

053559630

ABSTRACT:
An active rotary harrow is towed with its longitudinal horizontal axis at an acute angle relative to a line perpendicular to the direction of travel. A plurality of unitary tines are mounted by bolts or rivets on mounting plates which are secured to a shaft aligned along the horizontal axis. Each tine is made from spring steel which is flattened on one end, the flattened portion being mounted directly on the mounting plate by two or more fasteners. The tines are curved such that the outer end of the tine, being rounded in shape, is directed towards the trailing end of the harrow when in operation. The tines, and to a lesser extent, the mounting plates, are resilient in nature and can be deflected towards the trailing end of the harrow, when obstacles such as rocks are encountered. The tines are also capable of some pivotal deflection, to a lesser extent.

REFERENCES:
patent: 989338 (1911-04-01), Corne
patent: 2503474 (1950-04-01), Dooley
patent: 2559048 (1951-07-01), Seaman
patent: 3150721 (1964-09-01), Van Der Lely
patent: 3702638 (1972-11-01), Takata
patent: 4611669 (1986-09-01), Ballard
patent: 4629007 (1986-12-01), Pegoraro
patent: 4646850 (1987-03-01), Brown et al.
patent: 5158145 (1992-10-01), Karchewski

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