Rotary harrows

• US 3,951,213 A
• Filed: 09/30/1974
• Issued: 04/20/1976
• Est. Priority Date: 04/19/1972
• Status: Expired due to Term

• Current Assignee: Cornelis Van Der Lely
• Original Assignee: Cornelis Van Der Lely
• Inventors: van der Lely, Cornelis
• Primary Examiner(s): Marlo, George J.
• Application Number:
  US05/510,164
• Time in Patent Office: 568 Days
• Field of Search: 172/59, 172/76, 172/77, 172/78, 172/79, 172/111, 172/395, 172/669, 172/670, 172/676, 172/421, 280/DIG. 7, 280/43
• US Class Current: 172/49.5
• CPC Class Codes: A01B 33/087 Lifting devices; Depth regulation devices; Mountings

Abstract

A harrow has side-by-side rotary soil working members mounted on upright shafts which are journalled in a frame portion that extends transverse to the direction of travel. Supporting members are pivoted to the harrow'"'"'s frame in front of the soil working members and at each end of the frame portion. The supporting members have a wide ground engaging surface that is at least equal in width to the distance between adjacent shafts for the soil working members. The supporting members may be in the form a wheel with a low pressure tire, a wheel with a cage-like construction and longitudinal bars, or a skid with a ground-engaging surface of convex configureation.

Claims

1. A rotary harrow comprising a frame having an elongated frame portion extending transverse to the normal direction of travel and a plurality of rotary soil-working members mounted on upwardly extending shafts in a row, said shafts being supported on said frame portion and drive means connected to the shafts to rotate said soil-working members, a supporting member on arm means being connected to said harrow adjacent each lateral end of the frame portion, said arm means with said supporting member extending forwardly of the front of said portion and providing substantially the sole ground engaging supporting surface of the harrow to control the working depth of said soil working members, said supporting member having a supporting ground engaging surface with a width that at least equals the distance between two adjacent shafts, said arm means including a pair of arms and each supporting member having an outer arm substantially in register with a corresponding lateral end of said frame portion, said supporting member being entirely and directly located in front of said frame portion.

2. A harrow as claimed in claim 1, wherein said arm means is pivoted to the harrow.

3. A harrow as claimed in claim 2, wherein said arms are spaced apart and said supporting member is turnable about a substantial horizontal axis that extends transverse to the direction of travel of said harrow.

4. A harrow as claimed in claim 2, wherein said arms have retaining means for retaining said supporting member at any chosen one of a plurality of different levels relative to said frame portion.

5. A harrow as claimed in claim 2, wherein said supporting member is a wheel having a low pressure tire.

6. A harrow as claimed in claim 4, wherein pairs of forwardly projecting supports are secured to said frame portion and each supporting member is connected to its corresponding pair of supports through two spaced apart arms of said arm means, said arms being pivoted to said supports and each supporting member being located between its corresponding pair of supports.

7. A harrow as claimed in claim 2, wherein said supporting member is a wheel with a cage-like construction and longitudinal bars.

8. A harrow as claimed in claim 1, wherein each supporting member is a skid with a ground-engaging surface of convex configuration, the leading end of each skid, with respect to the direction of travel, being located above the ground surface.