Box scraper with plural blades

Details Box scraper with plural blades Box scraper with plural blades

1988-10-14

1989-09-26

Johnson, Richard J.

Earth working

Diverse tools

Second implement follows path of first

1724451, A01B 4902, E02F 376

Patent

active

048693260

ABSTRACT:
A box blade attachment for tractors and like vehicles comprises a box frame which supports, for pivotal movement, a pair of moldboards, horizontally spaced from each other for scraping a surface in either a forward or backward path. Each of the moldboards moves independently of the other between a first position depending vertically between the sidewalls of the frame, and a second position pivoted inwardly and upwardly to lie in a plane substantially parallel to the surface being scraped. Hydraulic moldboard controls in the preferred embodiment synchronize the movement such that the moldboards move, alternatively and relative to each other, between the first and second positions. Thus arranged the box blade can be used in a conventional manner when the vehicle is moving in either direction by raising the appropriate moldboard and lowering the other.

REFERENCES:
patent: 1074538 (1913-09-01), Alexander
patent: 1220898 (1917-03-01), Smith
patent: 2433019 (1947-12-01), Arps
patent: 3834465 (1974-09-01), Collins
patent: 4044843 (1977-08-01), Holub
patent: 4524532 (1985-06-01), Browning
patent: 4655297 (1987-04-01), Bourgeois

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