A - Human Necessities – 01 – B
Patent
A - Human Necessities
01
B
37/38
A01B 31/00 (2006.01) E01C 23/082 (2006.01) E02F 3/00 (2006.01)
Patent
CA 1247860
ABSTRACT OF THE DISCLOSURE A subgrading machine precisely levels and contours the subgrade within an area having first and second parallel oriented forms including parallel upper surfaces vertically spaced above the subgrade and defining a form surface plane. A grading blade extends along the front of a triangular truss frame terminated by first and second end sections and having a length less than the spacing between the forms. The front and rear edges of the frame define a frame base plane. An adjustable end bracket is coupled to each frame end section and includes a form contact element for maintaining a parallel alignment between the frame base plane and the form surface plane. The form contact element is coupled at a selectable vertical position to each end bracket to vary the spacing between the frame base plane and the form surface plane to thereby determine the grading depth of the grading blade. A winch system provides a traction force having an effective horizontal force vector at approximately the same elevation as the grading blade and the subgrade.
522480
Allen Engineering Corporation
Ridout & Maybee Llp
LandOfFree
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