Soil-loosening rotary hoe |
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| 申请号 | US28071972 | 申请日 | 1972-08-14 | 公开(公告)号 | US3812920A | 公开(公告)日 | 1974-05-28 |
| 申请人 | GREEN H; | 发明人 | GREEN H; | ||||
| 摘要 | A rotary hoe having a rotating disc with blades on its right and left sides, each blade having a sharp ground-penetration edge facing away from the axis of the disc and inclined with respect to the disc as seen in front view, and inclined with respect to the radius of the disc as seen in side elevation, said hoe having an elongated handle means provided with right and left arm engaging portions disposed above right and left hand grips. | ||||||
| 权利要求 | 1. A soil loosening rotary hoe comprising: an elongated handlebeam means having a forked means, said hoe having only one rotating ground-engaging member adapted to rotate as a unit as it is rolled across the surface of the ground, said handle-beam means being of a length for extending from said forked means upwardly and an acute angle with respect to the horizontal a distance substantialLy sufficient for a substantially erect human operator to hold an upper section of said handle-beam means in his hands while said rotating member is on the ground, said hoe being of a total size adapting it for manual operation, said rotating member having a hub means, said hub means having right and left sides having an axis extending from right to left and being journalled to said forked means for rotation about said axis, said handle-beam means being disposed at substantially a right angle to said axis, first and second sets of blades disposed to the right and left of each other and attached to said hub, said blades of each set being substantially disposed for following in the same swath as other blades in the same set and offset along said axis from the swath of blades in the other set as said hub rotates, said hoe being free of any other sets of blades beyond said first and second sets for narrowness for working in small places, each said blade having a forward side, the forward side of each blade being identified as that side thereof which faces in a rearward direction when the respective blade is disposed downwardmost, each of said blades having a certain one-third portion which is disposed outermost from said axis, said certain one-third portion of each blade having its forward side inclining as seen from a respective one of said right and left sides of said hub means with respect to a certain radius of said hub means which certain radius extends through a center of said certain one-third portion at a certain acute angle with respect to the respective radius. 2. The hoe of claim 1 further comprising said hub means having a center along said axis through which a vertical reference plane extends at a right angle to said axis, as said hoe is seen from its forward side each of said blades having an outer edge disposed farthest from said vertical reference plane, said outer edge of each blade being inclined at an acute angle with respect to said reference plane beginning with that outermost end of the respective blade which is disposed farthest from said axis being at a point substantially adjacent said reference plane, and said outer edge inclining at substantially an acute angle further and further away from said reference plane as said axis is approached along said outer edge. 3. The hoe of claim 2 in which said acute angle of said outer edge is approximately 30. 4. The hoe of claim 1 further comprising: said hub-means comprising a disc havng right and left sides which latter are substantially disposed in side-planes which latter are each at a right angle to said axis, said first and second sets of blades being attached to respective right and left sides of said disc so as to balance said hoe. 5. The hoe of claim 4 further comprising over three-fourths of the periphery of said disc being free of serrations. 6. The hoe of claim 1 further comprising: each of said blades having their said forward sides concave so as to have a scooping effect. 7. The hoe of claim 6 further comprising: the forward sides of said blades having a continuous surface with a gradual curvature for ease of penetration. 8. The hoe of claim 1 in which the periphery of said disc is sharpened in a manner causing a lesser disc-edge swath for easier penetration. 9. The hoe of claim 1 in which said certain angle is approximately 40. 10. The hoe of claim 1 in which said blades each respectively have a ground penetration edge disposed farthest from the blades of the other set, said penetration edges being substantially sharpened for easier penetration. 11. The hoe of claim 1 further comprising said hub means having a center along said axis through which a vertical reference plane extends at a right angle to said axis, as said hoe is seen from its forward side each of said blades having an outer edge disposed on that side of each blade which is farthest from said vertical reference plane, said outer edge of each blade being inclined at an acute angle with respeCt to said reference plane beginning with that outermost end of the respective blade which is disposed farthest from said axis being at a point substantially adjacent said reference plane, and said outer edge inclining at substantially an acute angle further and further away from said reference plane as said axis is approached along said outer edge, said hub-means comprising a disc having right and left sides substantially disposed in side-planes at a right angle to said axis, said first and second sets of blades being attached to respective right and left sides of said disc so as to balance said hoe, each of said blades having their said forward sides concave so as to have a scooping effect, the forward sides of said blades having a continuous surface with a gradual curvature for ease of penetration. 12. The hoe of claim 4 in which said disc projects away from said axis beyond all of said blades so that first ground penetration is made by said disc, and whereby said rotating member rolls on the edge of said disc. 13. The hoe of claim 1 in which said certain acute angle is approximately 20* to 60* for best penetration because of the motion of a blade during operation. 14. The hoe of claim 11 in which said certain acute angle is approximately 20* to 60* for best penetration because of the motion of a blade during operation. 15. The hoe of claim 14 further comprising over three-fourths of the periphery of said disc being free of serrations. 16. The hoe of claim 7 further comprising over three-fourths of the periphery of said disc being free of serrations. |
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