Metal working – Plow or cultivator iron making
Patent
1990-04-25
1991-03-19
Eley, Timothy V.
Metal working
Plow or cultivator iron making
B21H 706
Patent
active
049998935
ABSTRACT:
A method of making a bentleg plow includes cutting from a metal plate a tetragon having a leading edge and a trailing edge converging toward each other, the tetragon having a top portion adjacent a top edge, and a bottom portion adjacent a bottom edge. The bottom portion is bent with respect to the top portion about a hinge line which is such that the bottom portion has a rake which seeks to draw the plow into the soil being plowed. In a variant, a plurality of bentleg plow blades can be made. A length of steel plate, defined between two parallel edges, has cut from it a plurality of substantially identical trapezoids, each trapezoid having (1) a top edge along one of said parallel edges of the steel plate, (2) a leading edge defining an obtuse angle with the top edge and extending between said parallel edges, (3) a trailing edge defining an acute angle with the top edge and extending between said parallel edges, the leading edge and the trailing edge converging toward each other in the direction away from the top edge, and (4) a bottom edge along the other parallel edge and connecting the leading and trailing edges, each tetragon having a top portion adjacent the top edge, and a bottom portion adjacent the bottom edge. The bottom portion of each trapezoid is then bent in such a way as to meet the criteria given above.
REFERENCES:
patent: 2262885 (1941-11-01), Condo
patent: 2733500 (1956-02-01), Rendleman
patent: 4345358 (1982-08-01), Petkidis
Eley Timothy V.
Governors of the University of Alberta
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