US3821989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary harrows
Assignee: Individual
•
Filing: 1972-08-24
•
Granted: 1974-07-02
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Expires: 1992-08-24
Abstract
Abstract A rotary harrow has a main frame that extends transverse to the direction of travel with soil-working members journalled in the frame to rotate above vertical axes. A supporting structure surrounds the main frame and is attached to spaced apart plates secured at intervals along the top of the main frame. The supporting structure includes coupling means with strengthening rods attached to the structure at the front and rear of the main frame. A roller is connected to arms to trail the soil-working members and the arms are pivotally associated with the supporting structure with adjusting means to regulate the working depth of the soil-working members. A screening element is resiliently pivoted to the front of the main frame to protect the soilworking members from debris during operation.
Inventors
- 👤 Der Lely A Van
- 👤 C Bom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:54
CPC Classifications
A; A01; A01B; A01B33/00; A01B33/08; A01B33/14; A01B33/146; A01B33/06; A01B33/065; A01B33/12
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
276 words
A rotary harrow attachment comprising an elongated box-shaped main frame part housing drive means, said drive means being in driving engagement with a plurality of soil-working members rotatably journalled in said frame part, said members being mounted to turn about upwardly extending axes, a supporting structure being positioned above said frame part and extending substantially parallel to and over at least the length of said frame part, said supporting structure including at least two spaced apart beams that extend substantially parallel to a line interconnecting the axes of rotation of said soil-working members and said beams being positioned at different levels, above the ground, said beams being spaced from the forward and rearmost sides of said main frame part with respect to the direction of travel, and said beams being interconnected by a plurality of relatively spaced support plates that extend substantially parallel to said direction of travel, said supporting structure being coupled to the upper portion of said main frame part and having coupling means connectable to the three point lift of a prime mover, said coupling means comprising two pairs of lower coupling elements for connecting said harrow to the lower lift of the three-point lifting device, said elements being attached to the leading beam of said supporting structure, said lower coupling elements including at least one plate element with an aperture for receiving a pin that establishes a connection with a corresponding lower lifting link of the three-point lifting device, said coupling means having strengthening rod means for connection with the upper link of the three-point hitch, said strengthening rod extending downwardly and rearwardly to connect with the rear beam of said structure.
Claim 2
Dependent Claim
276 words
A rotary harrow attachment comprising an elongated box-shaped main frame part housing drive means, said drive means being in driving engagement with a plurality of soil-working members rotatably journalled in said frame part, said members being mounted to turn about upwardly extending axes, a supporting structure being positioned above said frame part and extending substantially parallel to and over at least the length of said frame part, said supporting structure including at least two spaced apart beams that extend substantially parallel to a line interconnecting the axes of rotation of said soil-working members and said beams being positioned at different levels, above the ground, said beams being spaced from the forward and rearmost sides of said main frame part with respect to the direction of travel, and said beams being interconnected by a plurality of relatively spaced support plates that extend substantially parallel to said direction of travel, said supporting structure being coupled to the upper portion of said main frame part and having coupling means connectable to the three point lift of a prime mover, said coupling means comprising two pairs of lower coupling elements for connecting said harrow to the lower lift of the three-point lifting device, said elements being attached to the leading beam of said supporting structure, said lower coupling elements including at least one plate element with an aperture for receiving a pin that establishes a connection with a corresponding lower lifting link of the three-point lifting device, said coupling means having strengthening rod means for connection with the upper link of the three-point hitch, said strengthening rod extending downwardly and rearwardly to connect with the rear beam of said structure.
Claim 3
Dependent Claim
36 words
A harrow as claimed in claim 1, wherein said rear beam of said supporting structure is located at a higher level from the ground than said leading beam when the harrow is seen from the side.
Claim 4
Dependent Claim
19 words
A harrow as claimed in claim 1, wherein said beams are releasably connected to said support plates by clamps.
Claim 5
Dependent Claim
37 words
A harrow as claimed in claim 1, wherein said support plates comprise pairs of spaced apart plates, the space between at least one pair of plates forming a storage compartment and a top cover overlying said space.
Claim 6
Dependent Claim
14 words
A harrow as claimed in claim 1, wherein said beams are of angular corss-section.
Claim 7
Dependent Claim
38 words
A harrow as claimed in claim 1, wherein each soil-working member has tines and includes a substantially horizontal tine support which has tine holders at its opposite ends in which upper fastening portions of said tines are secured.
Claim 8
Dependent Claim
18 words
A harrow as claimed in claim 6, wherein the longitudinal axes of the tine holders are substantially vertical.
Claim 9
Dependent Claim
70 words
A harrow as claimed in claim 7, wherein each tine has substantially straight fastening portion and a substantially straight soil-working portion, the longitudinal axes of said two portions being relatively inclined at an angle of not less than about 8*, and said fastening portion of each tine cooperates with its respective holder whereby the soil-working portion of each tine occupies a trailing position with respect to its direction of rotation.
Claim 10
Dependent Claim
57 words
A harrow as claimed in claim 8, wherein said fastening portion of each tine has at least one rib which is entered in a corresponding recess at the lower end of its corresponding tine holder, the uppermost end of each tine fastening portion being screw-threaded to receive a nut which clamps said fastening portion in its holder.
Claim 11
Dependent Claim
34 words
A harrow as claimed in claim 6, wherein each tine holder has a screening plate and said plate is located above and in front of its holder relative to the direction of rotation thereof.
Claim 12
Dependent Claim
27 words
A harrow as claimed in claim 10, wherein each screening plate is inclined upwardly and forwardly with respect to the direction of rotation of its corresponding holder.
Claim 13
Dependent Claim
50 words
A harrow as claimed in claim 6, wherein a screening element is connected to said attachment to extend in front of said main frame part with respect to the direction of travel, the lower edge of said screening element being located at a lower horizontal level than said tine supports.
Claim 14
Dependent Claim
50 words
A Harrow as claimed in claim 12, wherein said screening element is pivotably connected to said frame to turn about a substantially horizontal axis that extends transverse to the direction of travel, said screening element being inclined downwardly and rearwardly with respect to said direction, away from its connection points.
Claim 15
Dependent Claim
37 words
A harrow as claimed in claim 13, wherein said screening element is operatively associated with resilient means connected to said attachment whereby the element is turnable about said axis in at least one direction against resilient opposition.
Claim 16
Dependent Claim
60 words
A harrow as claimed in claim 14, wherein said screening element is pivotably connected to said attachment with arms, and said resilient means includes springs which engage said arms between the horizontal pivotal axis and said screening element, said springs extending substantially parallel to the direction of travel, whereby said screening element pivots forwardly against the opposition of said springs.
Claim 17
Dependent Claim
21 words
A harrow as claimed in claim 15, wherein the pivotal axis of said screening element extends above said main frame part.
Claim 18
Dependent Claim
42 words
A harrow as claimed in claim 1, wherein said lower coupling elements are attached to the leading beam at different distances from opposite sides of a vertical plane of substantial symmetry of said harrow that extends parallel to the direction of travel.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-01 | 1977-12-31 | 1978-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-01 | 1981-12-31 | 1982-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-01 | 1985-12-31 | 1986-07-02 | $7700.00 | Window Closed / Lapsed |