Harrows

• US 4,043,400 A
• Filed: 10/13/1976
• Issued: 08/23/1977
• Est. Priority Date: 06/23/1972
• Status: Expired due to Term

• Current Assignee: C. Van Der Lely N. V.
• Original Assignee: C. Van Der Lely N. V.
• Inventors: van der Lely, Cornelis, VAN DER Lely, Ary
• Primary Examiner(s): Pellegrino, Stephen C.
• Application Number:
  US05/732,093
• Time in Patent Office: 314 Days
• Field of Search: 172/39, 172/43, 172/59, 172/68, 172/111, 172/121, 172/526, 172/543, 172/552, 172/556
• US Class Current: 172/43
• CPC Class Codes: A01B 27/00 Clod-crushers
• CPC Class Codes: A01B 33/065 comprising a plurality of rotors carried by an elongate, substantially closed transmission casing, transversely connectable to a tractor
• CPC Class Codes: A01B 49/025 about a substantially vertical axis

Abstract

This invention relates to harrows, such harrows being of the kind comprising a frame portion that is movable over the ground and that is provided with a plurality of soil working members or rotors arranged to turn about corresponding upwardly extending axes, the frame portion being sustained from the ground during the use of the harrow by a rotary supporting member.

Claims

1. A rotary harrow comprising a frame portion supporting at least four soil-working members rotatably mounted side-by-side in a row that extends transverse to the normal direction of travel on corresponding upwardly extending shafts, driving means supported by said frame portion and said driving means engaging said shafts to rotate same about axes defined by said shafts, a rotatable transversely extending supporting member being connected to said frame portion to the rear of said soil-working members, said supporting member comprising at least two portions and each of said portions having a periphery comprising ground engaging rods mounted on at least one elongated support, said rotatable portions being located adjacent one another and being rotatable about a common horizontal transverse axis, said rods extending in the same general direction as said common axis and having angular bends between their opposite ends, the points of said bends being located substantially in line with a plane that extends midway between two adjacent soil-working members and parallel to the direction of travel of the harrow.

2. A rotary harrow as claimed in claim 1, wherein said bends are shallow and said rods extend substantially straight to each side of their corresponding bends.

3. A rotary harrow as claimed in claim 2, wherein said rods have end portions that are fastened to plates secured to the elongated support.

4. A rotary harrow as claimed in claim 1, wherein said rods extend substantially parallel to one another and are comprised of resilient material having a circular cross-section.

5. A rotary harrow as claimed in claim 1, wherein the lengths of said supporting member portions are substantially the same.

6. A rotary harrow as claimed in claim 1, wherein said soil working members are arranged in pairs and the members of each pair are rotated in relative opposite directions by said driving means, said points of the rod bends being in line with the plane that extends midway between adjacent members of said pair.

9. A harrow comprising a frame portion supporting a plurality of soil working members rotatably mounted side-by-side in a row that extends transverse to the normal direction of travel, said soil working members being mounted on corresponding upwardly extending shafts and driving means on said harrow in driving engagement with said shafts to rotate same, a rotatable supporting member being connected to said frame portion to the rear of said soil working members, said rotatable member comprising at least two portions which are rotatably mounted on tube means, each of said rotatable portions including ground engaging rods that extend across the width of that portion, said rods having opposite ends that are bent towards said tube means and fastened to plate means secured to said tube means, said rotatable portions being located adjacent one another and being independently rotatable with respect to one another about a common axis, the axial width of each portion being substantially equal to the working width of two adjacent soil working members in said row.

7. A harrow as claimed in claim 9, wherein said rotatable portions adjoin one another in a region that is in general alignment with a further region between two of said soil working members having tines that are rotated towards one another during operation.

8. A harrow as claimed in claim 9, wherein said rods are supported solely at their opposite ends, said rods being resilient and providing flexible support for said harrow.