Box scraper with plural blades
US4869326A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Oct 14, 1988 |
| Grant date | Sep 26, 1989 |
| Priority date | — |
| Expiry date | Oct 14, 2008 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02F3/7631
- WIPO fieldCivil engineering
- WIPO sectorOther fields
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.