Earth working – Towed scraper with ground support wheels
Patent
1987-03-13
1990-02-06
Johnson, Richard J.
Earth working
Towed scraper with ground support wheels
172413, 172477, 172200, E02F 376
Patent
active
048982474
ABSTRACT:
An earth scraper attachment adapted to be drawn by a farm tractor or other vehicle having a vertically adjustable three point hitch has an elongated frame with a front tongue portion connectable to the hitch with a specially designed hitch connection member. A rear end portion of the frame is supported on opposite sides of the longitudinal axis of the frame by a pair of wheels whose heights relative to the frame may be selectively and independently adjusted. Depending from a longitudinally central portion of the frame is an earth scraping blade which is supported on the frame for pivotal motion about a generally vertically extending axis, and may be locked in a selected pivotally adjusted position. A laterally spaced series of downwardly extending earth ripping teeth are supported beneath the frame forwardly of the scraping blade and are used to rip and loosen the earth prior to operation thereon by the scraping blade. The independent height adjustment of the rear support wheels, together with the tongue height adjustment provided by the three point hitch, allows various positional adjustments to be made to the frame including uniformly raising or lowering the overall frame, altering its front-to-rear tilt angle and altering its side-to-side tilt angle about the longitudinal frame axis. These frame positional adjustments, coupled with the pivotal adjustment capability of the scraping blade, permit the blade and its associated ripping teeth to be variously positioned to perform most of the sophisticated earth-scraping and grading functions of heavy duty commercial apparatus, such as motor graders, at a fraction of the cost thereof.
REFERENCES:
patent: 1982219 (1934-11-01), McAlister
patent: 2866281 (1958-12-01), Breaux
patent: 3172480 (1965-03-01), Bemis
patent: 3302317 (1967-02-01), Domres
patent: 3716105 (1973-02-01), Hallam
patent: 3924689 (1975-12-01), Manor
patent: 4526238 (1985-07-01), Williams
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