# Patent

## Title
Adjustable clamp on head bracket

## Abstract

The selective positioning of row units along a planter tool bar is facilitated by introducing an elongated channel of generally C-shaped cross-sectional configuration intermediate the tool bar and a plurality of row unit head brackets. The channel is welded or otherwise fixed to the tool bar with the open edge of the “C” facing away from the tool bar and the head brackets are fixed to the channel by clamping nut and bolt assemblies. The bolts extend through the clamping brackets and engage corresponding clamping nuts. The clamping nuts are positioned within the “C” and may be slid along the inner edge of the channel to any preferred position. The bolts are then and tightened fixing the head bracket at the selected at location.

## Background
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to ground working equipment, such as an agricultural implement, and, more particularly, to a system for attaching row units on an agricultural implement.
2. Description of the Related Art
Generally, planting implements (e.g., planters) are towed behind a tractor or other work vehicle via a mounting bracket secured to a rigid frame (tool bar) of the implement. These planting implements typically include multiple row units distributed across the width of the implement. Each row unit is configured to deposit seeds at a desired depth beneath the soil surface, thereby establishing rows of planted seeds. For example, each row unit may include a ground engaging tool that forms a seeding path for seed deposition into the soil. As the implement travels across a field, the opener excavates a trench into the soil, and seeds are deposited into the trench. Individual row units are usually attached to a common implement tool bar, for example by U-bolts which fasten row unit receiving head brackets to the tool bar.
Some planters, known as splitters, have the ability to plant two different crops. For example, corn is typically planted in rows spaced 30 inches on center from one another while beans are more closely spaced at 15 inches between rows. A planter having 31 row units may have adjacent row units longitudinally offset from one another to allow field debris to pass around the offset units. Alternate ones of the units, 15 in this example, may be pivoted out of the way for planting, e.g., corn, in more widely spaced rows while the those units may be pivoted down and employed in planting crop such as beans in 31 more narrowly spaced rows.
Some farmers purchase a planter and modify it to change spacing. They may buy a 24 row planter with 20 inch spacing and change it to 12 row with 38 inch spacing to plant specialty crops. Tool bars are becoming increasingly crowded. Today with all of the obstructions on top of the bar (vacuum systems, hydraulic systems, and other structures) modifying the planter configuration is difficult.
What is needed in the art is a simple technique for modifying a planter configuration.
SUMMARY OF THE INVENTION
The present invention provides a way to attach head brackets to a tool bar using a clamping system for easier adjusting to the spacing of row units.
The invention in one form is directed to a towable agricultural implement having a transverse tool bar, a plurality of like row units, and a coupling arrangement for coupling the row units to the tool bar. A plurality of like brackets each receive a corresponding row unit head and an elongated transverse member of generally uniform C-shaped cross-sectional configuration has the closed side of the “C” fixed to the tool bar. Each of the brackets is bolted to the open side of the “C” opposite the tool bar.
The invention in another form is directed to a fastening arrangement for attaching row units to the tool bar of an agricultural implement. A plurality of head brackets are each adapted to receive a row unit. An elongated open C-shaped channel member is connected to the tool bar and protruding therefrom to removable receive a plurality of row unit head brackets. A plurality of clamping nut and bolt assemblies fasten the head brackets to the channel member. Each clamping nut and bolt assembly includes a bolt adapted to pass through a head bracket aperture and threadedly engage the corresponding clamping nut. Each clamping nut grips the inner edge of the “C” as a bolt is tightened.
In yet another form, the invention, there is a clamping nut and bolt assembly for fastening a head bracket of an agricultural implement to an elongated open C-shaped channel member. The clamping nut is formed as an elongated rigid member having a transverse threaded aperture and an elongated lip extending along one edge generally orthogonal to the threaded aperture. The lip is contoured to mate with a corresponding edge of the open side of the “C”. The clamping nut may include a second transverse threaded aperture extending generally parallel to and spaced from the first threaded aperture whereby the clamping nut may accommodate a pair of bolts.
An advantage of the present invention is that if is now possible to provide a common tool bar (or tooling) for different sized planters.
Another advantage is some tool bar clutter is alleviated and the repositioning of row unit head brackets is facilitated.
Yet another advantage is the possibility of providing a blank tool bar and the appropriate row unit completing kits to allow farmers to custom build a planter.



BRIEF DESCRIPTION OF THE DRAWINGS
The above-mentioned and other features and advantages of this invention, and the manner of attaining them, will become more apparent and the invention will be better understood by reference to the following description of an embodiment of the invention taken in conjunction with the accompanying drawings, wherein:
FIG. 1 is a top view of a portion of an agricultural planter incorporating the invention in one form;
FIG. 2 is an isometric view of an illustrative tool bar, C-shaped channel and head brackets suitable for use in FIG. 1;
FIG. 3 is a top plan view of the tool bar, C-shaped channel and head brackets of FIG. 2;
FIG. 4 is a rear elevation view of the structure of FIGS. 2 and 3;
FIG. 5 is a cross-sectional view along line 5-5 of FIGS. 3 and 4;
FIG. 6 is an exploded isometric view of an illustrative head bracket and clamping nuts for use in FIGS. 2-5;
FIG. 7 is a top plan view of a variation on FIG. 3;
FIG. 8 is a rear elevation view of the structure of FIG. 7;
FIG. 9 is a cross-sectional view along line 9-9 of FIGS. 7 and 8; and
FIG. 10 is an exploded isometric view of the variation of FIGS. 7-9.



Corresponding reference characters indicate corresponding parts throughout the several views. The exemplification set out herein illustrates one embodiments of the invention, in one form, and such exemplification is not to be construed as limiting the scope of the invention in any manner.
DETAILED DESCRIPTION OF THE INVENTION
Referring now to the drawings, and more particularly to FIG. 1, there is shown a portion of a planter 10 or similar agricultural implement which may be towed generally in the direction of arrow 12. The implement includes a tool bar 14 to which an elongated channel 16 of generally C-shaped cross-section is fixed as by welding along the closed edge of the “C”. As noted earlier, many planting implements are too wide for transport on highways, entry to farm fields through gates, or for barn storage. These may have a relatively fixed central portion with additional portions extending laterally as wings which may be pivoted and/or rotated to a stowed position for transport or storage. The tool bar 14 illustrated may either form part of such a central portion or part of a wing.
A number of illustrative row units such as 18 and 20 are shown. The configuration illustrated would be for planting narrow spaced rows of crop, e.g., beans. The illustrated row units are conventional and are received in head brackets such as 22, 24 and 26 in a conventional manner. The current technology uses threaded U-Bolts to clamp around the main part of the tool bar 14 and attaches the head brackets like 22, 24 and 26 directly thereto with nuts. These head brackets are attached to the tool bar in an entirely different fashion in the present invention.
In FIG. 2, an illustrative head bracket 30 is shown in spaced alignment with the elongated channel 16. The remaining head brackets such as 32, 34 and 36 are fixed to the channel. Brackets such as 32 and 36 differ from brackets such as 34 only in extending further rearward and employing an additional plate adjacent to the channel to accept bolts and clamping nuts. The channel 16 is fixed to the tool bar 14 by welding at 56 (FIG. 5) along the closed edge of the “C”. A set of clamping nuts 38, 40, 42 and 44 are positioned within the open side of the “C” to receive corresponding bolts such as 46 and 48. Each bracket has a generally U-shaped cross-sectional configuration having a pair of row unit gripping arms 50 and 52 extending from an intermediate region 54. The intermediate region 54 includes a set of apertures certain ones of which may be generally aligned with corresponding edges of the open side of the “C”.
There is a set of four clamping nut and bolt assemblies for each bracket. Each clamping nut may, as best seen in FIG. 6, comprise an elongated member of generally uniform cross-sectional configuration having a threaded aperture 58 or 60 near one edge and a laterally extending lip 62 or 64 whereby the nut may be positioned within the open “C” with the bolt passing through a bracket aperture to threadedly engage the nut with the lip gripping the inner edge of the “C” as the bolt is tightened. Any difficulty in locating the upper clamping nuts 40 and 44 within the “C” to threadedly receive the corresponding bolts may be avoided by first passing the upper bolts through the head bracket and loosely joining those bolts with the nuts 40 and 44. The clamping nuts may then be tipped into position behind the upper edge of the open “C” and the remaining bolts 46 and 48 then joined with their clamping nuts 38 and 42. An alternative is to employ the technique of FIG. 10.
The clamping brackets of FIGS. 2-5 are configured for a narrow row spacing while the clamping brackets of FIGS. 7-10 are configured for a wider row spacing as might be employed in planting corn. The clamping nuts 66 and 68 are again configured as elongated rigid members having a transverse threaded aperture and an elongated lip extending along one edge generally orthogonal to the threaded aperture. The lip is contoured to mate with a corresponding edge of the open side of the “C”. Clamping nuts 66 and 68 are a good bit longer that nuts such as 40 and each includes a pair of transverse generally parallel spaced apart threaded apertures 70 and 72 or 74 and 76 so that each clamping nut may accommodate a pair of bolts such as 78 and 80.
An assembly technique utilizing these longer clamping nuts is illustrated in FIG. 10. Bolts such as 78 and 80 are passed through apertures in head bracket 82 and loosely threaded into the clamping nut apertures 70, 72, 74 and 76 as indicated by dotted lines 84. Then the assembly is slid longitudinally into the channel open end 86 along lines 88. The set of clamping nuts passes into the open “C” end and along the interior of the “C” edge until the bracket is positioned at a preferred location whereupon the bolts may be tightened to lock the bracket at that preferred location. The opposite channel end may be similarly open to accept head brackets with clamping nut and bolt assemblies.
Repositioning of head brackets simply requires loosening four bolts, sliding the bracket to a desired location, and retightening the four bolts.
Substantially the same advantages accrue when employing a set of single clamping nuts as in FIG. 6, or the double clamping nut as shown in FIG. 10 and either clamping nut configuration may be employed in any of the illustrated assemblies. By moving the attachment point off the tool bar and to a formed structural shape that is welded to the bar adjustment is made easier. This also makes it possible to communize tool bars in the plant so that the base tool bar is the same for equal sizes planters. This would also allow the size of the tool bar shape (7×7 today) to vary in size (say to an 8×8 or a 9×7) without the need to tool another bolt on head bracket.
While this invention has been described with respect to at least one embodiment, the present invention can be further modified within the spirit and scope of this disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the invention using its general principles. Further, this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this invention pertains and which fall within the limits of the appended claims.

## Claims

1. A towable agricultural implement has a transverse tool bar; a plurality of like row units; and a coupling arrangement for coupling the row units to the tool bar including a plurality of like brackets, each receiving a corresponding row unit head, and an elongated transverse member fixed to the tool bar and removably fastened to each of the brackets; wherein the elongated transverse member has a generally uniform C-shaped cross-sectional configuration with the closed side of the “C” welded to the tool bar and the brackets generally uniformly spaced along and bolted to the open side of the “C” opposite the tool bar.

2. The towable agricultural implement of claim 1, wherein each bracket has a generally U-shaped cross-sectional configuration having a pair of row unit gripping arms extending from an intermediate region, the intermediate region including a set of apertures certain ones of which may be generally aligned with corresponding edges of the open side of the “C”.

3. The towable agricultural implement of claim 2, further including a set of clamping nut and bolt assemblies for each bracket, each clamping nut comprising an elongated member of generally uniform cross-sectional configuration having a threaded aperture near one edge and a laterally extending lip whereby the nut may be positioned within the open “C” with the bolt passing through a bracket aperture to threadedly engage the nut with the lip gripping the inner edge of the “C” as the bolt is tightened.

4. The towable agricultural implement of claim 3, wherein each intermediate region includes a set of four apertures and there is a set of four clamping nut and bolt assemblies for each bracket, and wherein the elongated transverse member uniform C-shaped cross-sectional configuration continues through at least one open end whereby each bolts may be passed into a corresponding aperture and threaded part way into the clamping nut, the set of clamping nuts passed into the open “C” end and along the interior of the “C” edge until the bracket is positioned at a preferred location whereupon the bolt may be tightened to lock the bracket at that preferred location.

5. The towable agricultural implement of claim 3, wherein there are two pair of nut and bolt assemblies, one pair for gripping the upper edge of the “C” and the other pair for gripping the lower edge of the “C”.

6. The towable agricultural implement of claim 3, wherein each clamping nut includes a second transverse threaded aperture extending generally parallel to and spaced from said threaded aperture whereby the clamping nut may accommodate a pair of bolts.