Rotary harrow tool and harrow equipped with such tools

Patent metadata

Field	Value
Publication number	US-10149421-B2
Application number	US-201615332577-A
Country	US
Kind code	B2
Filing date	Oct 24, 2016
Priority date	Oct 23, 2015
Publication date	Dec 11, 2018
Grant date	Dec 11, 2018

Abstract

A rotary harrow tool includes a body with a lower part that has, in the zone of its lower end, a working portion capable of and designed for being engaged and displaced in the soil and is equipped with at least one element attached in the form of an insert constituting at least the active front edge and the active adjoining elongated face of the working portion at least of the tool. The upper insert, situated opposite the free or lower end of the second part, has a rounded inner corner. Each insert has a substantially plane structure with, viewed in section along a plane perpendicular to the active edge and to the active face, a variable thickness that decreases from its front longitudinal rim forming the active edge to its rear longitudinal rim mounted in the receiving site, while forming a bevel by cooperation with the support piece.

First claim

The invention claimed is:

1. A rotary harrow tool, comprising:
a body with a first upper connecting part and a second lower part forming a blade, wherein the second part has, in a zone of a free or lower end, a working portion to be engaged and displaced in the soil and is equipped with at least one element attached in the form of an insert constituting at least an active front edge and an active adjoining elongated face of the working portion at least of the tool, wherein the at least one insert is mounted rigidly with conjugate shape in a hollow complementary receiving site of the portion of the body defining the working portion or of an intermediate support piece attached on or in the working portion,
wherein the at least one insert includes an upper insert or an upper region of a single insert, situated opposite the free or lower end of the second part, has a rounded inner corner of convex shape and the at least one insert has a substantially plane structure with, viewed in section along a plane perpendicular to the active edge and to the active face, a variable thickness that decreases from a front longitudinal rim forming the active edge to a rear longitudinal rim mounted in the receiving site, while forming a bevel by cooperation with the working portion and/or the support piece.

2. The tool according to claim 1 , wherein the at least one insert has a substantially rectangular shape and two opposite longitudinal sides of the rectangular shape correspond respectively to the active edge and to the rear longitudinal rim, while the convex rounded corner is situated between the rear longitudinal rim and an upper transverse rim of the at least one insert, while being prolonged as a bulging portion of the upper transverse rim.

3. The tool according to claim 1 , wherein the convex rounded inner corner borders the active face of the working portion.

4. The tool according to claim 1 , wherein the rear longitudinal rim is mounted against a shoulder of the receiving site.

5. The tool according to claim 4 , wherein the at least one insert has a plane and flat general constitution of variable thickness, the working portion or the intermediate support piece substantially has a form of a prism of triangular section, and the receiving site is made in a lateral flank of the prism, wherein a contact surface between the receiving site and the at least one insert is plane and flat beyond the shoulder.

6. The tool according to claim 4 , wherein the upper insert or the upper region of the single insert, situated opposite the free or lower end of the second part, has a rounded outer corner, wherein the upper transverse rim of the at least one insert has, by contiguous association of the inner and outer corners, a convex rounded shape over its entire width that extends between the front edge and the rear longitudinal rim, and the shoulder of the receiving site has a groove of concave rounded complementary shape, in a region cooperating with the upper transverse rim.

7. The tool according to claim 6 , wherein a lower insert or a lower region of the single insert of the at least one insert, situated at a level of the free or lower end of the second part, has a rounded outer lower corner extending from the front edge.

8. The tool according to claim 7 , wherein the rounded rims of the upper and lower outer corners are joined in continuous and smooth manner with the active front edge.

9. The tool according to claim 1 , wherein the active front edge is protruding relative to the working portion and/or to the support piece, in the direction of displacement of the second part in a working phase of the tool, and has a rounded outer shape in cross section.

10. The tool according to claim 1 , wherein the working portion of the second part of the body of the tool or the intermediate support piece receiving the at least one insert has, in a zone adjoining the upper insert or in the upper region of the single insert, a width of section that increases progressively from the active edge toward a front rim or edge of the portion of the second part extending above the working portion.

11. The tool according to claim 1 , wherein the at least one insert is mounted in the receiving site that is formed directly in the second part of the body of the tool and is made integral with the second part by brazing.

12. The tool according to claim 1 , wherein the at least one insert is mounted in the receiving site of the intermediate support piece, wherein the intermediate support piece is mounted in a cutout or a housing site made in the second part of the body of the tool or forms in totality the working portion, wherein the at least one insert is made integral with the support piece by brazing and the support piece is made integral with the second part by welding.

13. The tool according to claim 1 , wherein the at least one insert is a single insert forming the active edge and the active face of the working portion of the second part of the body of the tool, wherein the single insert has a rounded upper end over an entire width and a rounded lower end at a level of a front corner.

14. The tool according to claim 1 , wherein the at least one insert is at least two separate elementary inserts, which together form a composite insert providing the active edge and the active face of the working portion of the second part of the body of the tool, the at least two separate elementary inserts including at least one upper insert with a rounded upper end and at least one lower insert with a rounded lower end at a level of an outer front corner as well as, at least one intermediate insert disposed in an adjoining and abutting manner between the upper and lower inserts.

15. A rotary harrow, comprising:
rotary tool-holding rotors, each having a pair of opposite tools, wherein each of the opposite tools includes the tool according to claim 1 .

16. A method for manufacturing the tool according to claim 1 , comprising:
providing an elongated metal insert by cutting;
performing hot-bending of the insert to obtain an L-shaped body with a first connecting part and a second part forming a blade;
making one or more fixation orifices in the first part;
machining a receiving site of one or more inserts;
mounting the one or more inserts in the receiving site and making the one or more inserts integral with the receiving site by brazing to make a composite tool; and
performing, after the mounting, operations of heating, quenching and tempering of the composite tool.

17. A method for manufacturing a tool according to claim 1 , comprising:
providing an elongated metal insert by cutting;
performing hot-bending of the insert to obtain an L-shaped body with a first connecting part and a second part forming a blade;
making one or more fixation orifices in the first part;
providing an intermediate support piece;
mounting, after the providing the intermediate support piece, one or more inserts on the support piece and making the one or more inserts integral with the support piece by brazing;
mounting the support piece carrying the one or more inserts in a housing site already obtained during the cutting and making the support piece carrying the one or more inserts integral with the housing site by welding to form a composite tool; and
performing, after the mounting the support piece, operations of heating, quenching and tempering of the composite tool.

Assignees

• Kuhn Sa

Inventors

• Schott Thierry
• Teitgen Herve

Classifications

• A01B23/00 Primary

  Elements, tools, or details of harrows · CPC title

• A01B33/106 Primary

  the rotating shaft being oriented vertically or steeply inclined · CPC title

• A01B27/00

  Clod-crushers · CPC title

• A01B23/02

  Teeth; Fixing the teeth · CPC title

• A01B21/02 Primary

  with tooth-like tools · CPC title