Ground-working apparatus and hitch assembly therefor

Details Ground-working apparatus and hitch assembly therefor Ground-working apparatus and hitch assembly therefor

1979-04-23

1980-12-02

Stouffer, Richard T.

Earth working

Scraper position automatically controlled by linkage for...

172451, 172456, 172780, E02F 376

Patent

active

042365872

ABSTRACT:
Land leveling apparatus includes a leveling attachment drawn by a tractor with the attachment having pivotally connected side blade sections on a central blade section affording a substantially greater leveling capacity. The side blade sections fold up to reduce width during transport and have a power-driven linkage arrangement for each blade section that moves and positions the blade sections and locks them in the lowered working position, together with upper and lower level adjustments for the side blade sections. A hitch assembly facilitates quick coupling to a crossbar carried by the lower links of the tractor linkage and is pivotally joined to the central blade section so as to facilitate rear tractor wheel movement independently of the scraper blades. A leveling frame is connected at the front end to the central blade section and the pivotal attachments of the hitch assembly to the tractor linkage with the central blade section provide a four-bar linkage leveling structure that automatically moves in response to tractor movement to maintain the scraping edge substantially in a ground plane of the rear leveler frame wheels and front wheels of the tractor independently of the vertical movement of the rear wheels of the tractor.

REFERENCES:
patent: 2478736 (1949-08-01), Balzer
patent: 2583897 (1952-01-01), Smeds
patent: 2697393 (1954-12-01), Gardner
patent: 3032902 (1962-05-01), Shumaker
patent: 3090141 (1963-05-01), Shumaker
patent: 3428335 (1969-02-01), Clark
patent: 3524269 (1970-08-01), Jackoboice
patent: 3967684 (1976-07-01), Haverdink
patent: 4047574 (1977-09-01), Foreman
patent: 4090725 (1978-05-01), Perin
patent: 4126328 (1978-11-01), Old

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