TILLAGE AND FERTILIZER KNIFE ATTACHMENT METHOD

Abstract

A tillage implement has row units with shank assemblies including shanks. The shank assemblies may be pivotally engaged with the row units and biased toward engagement with the ground using a spring member. A tool assembly is connected to each shank assembly by way of planar members on each lateral side of the shank. Each shank has at least two mounting features, and each planar member has at least two matching mounting features. A pivot member may be engaged with one of the mounting features of the shank and with one of the matching mounting features of each planar member. At least one shear member may be engaged with at least one of the mounting features of the shank and with at least one of the matching mounting features of each planar member. The shear member may minimize damage to the tool assembly, while the planar members may minimize misalignment.

Claims

1. A tillage implement, comprising: at least one row unit; at least one shank assembly including a shank engaged with said at least one row unit; a tool assembly connected to each of said at least one shank assembly by way of a planar member on each lateral side of said shank; said shank having at least two mounting features; each said planar member having at least two matching mounting features; a first connecting member engaged with one of said at least two mounting features of said shank and with one of said at least two matching mounting features of each said planar member; and at least one additional connecting member engaged with at least one of said at least two mounting features of said shank and with at least one of said at least two matching mounting features of each said planar member.

2. The tillage implement of claim 1, wherein: said at least one shank assembly and said tool assembly being arranged on a common vertical centerline when said tool assembly is connected to said shank by way of said planar members; and said planar members on each lateral side of said shank being symmetrically opposite of one another about said common vertical centerline.

3. The tillage implement of claim 2, wherein: said shank is pivotally engaged with said at least one row unit; and said shank is biased toward engagement with the ground using at least one spring member.

4. The tillage implement of claim 2, further comprising: at least one adapter, said planar members on each lateral side of said shank further comprising ears of said at least one adapter.

5. The tillage implement of claim 2, wherein: said planar members on each lateral side of said shank each further comprises a separate adapter plate.

6. The tillage implement of claim 2, wherein: said first connecting member is a pivot member; and said at least one additional connecting member is at least one shear member.

7. The tillage implement of claim 6, wherein: said at least two mounting features of said shank and said at least two mounting features of each said planar member further comprise holes; said pivot member further comprises a bolt or pin; and said at least one shear member further comprises a bolt or a pin.

8. The tillage implement of claim 7, wherein: said pivot member is inserted through an upper of said at least two mounting feature holes in said shank and through an upper of said at least two mounting feature holes in each said planar member; and said at least one shear member is inserted through a lower of said at least two mounting feature holes in said shank and through a lower of said at least two mounting feature holes in each said planar member.

9. The tillage implement of claim 7, wherein: said at least one shear member is further provided with at least one shear ensuring feature.

10. The tillage implement of claim 1, wherein: said shank of said at least one shank assembly further comprises a flat-sided curved shank having no lateral offset.

11. A ground working member of a tillage implement, comprising: a shank assembly including a shank; a tool assembly connected to said shank assembly by way of a planar member on each lateral side of said shank; said shank having at least two mounting features; each said planar member having at least two matching mounting features; a first connecting member engaged with one of said at least two mounting features of said shank and with one of said at least two matching mounting features of each said planar member; and at least one additional connecting member engaged with at least one of said at least two mounting features of said shank and with at least one of said at least two matching mounting features of each said planar member.

12. The ground working member of claim 11, wherein: said shank assembly and said tool assembly being arranged on a common vertical centerline when said tool assembly is connected to said shank by way of said planar members; and said planar members on each lateral side of said shank being symmetrically opposite of one another about said common vertical centerline.

13. The ground working member of claim 12, further comprising: at least one adapter, said planar members on each lateral side of said shank further comprising ears of said at least one adapter.

14. The ground working member of claim 12, wherein: said planar members on each lateral side of said shank each further comprises a separate adapter plate.

15. The ground working member of claim 12, wherein: said first connecting member is a pivot member; and said at least one additional connecting member is at least one shear member.

16. The ground working member of claim 15, wherein: said at least two mounting features of said shank further comprise projecting cylindrical bosses; said at least two mounting features of each said planar member further comprise holes; said pivot member further comprises a cylindrical surface of at least one of said projecting cylindrical bosses; and said at least one shear member further comprises a cross section of another of said projecting cylindrical bosses.

17. The ground working member of claim 15, wherein: said at least two mounting features of said shank and said at least two mounting features of each said planar member further comprise holes; said pivot member further comprises a bolt or pin; and said at least one shear member further comprises a bolt or a pin.

18. The ground working member of claim 17, wherein: said pivot member is inserted through an upper of said at least two mounting feature holes in said shank and through an upper of said at least two mounting feature holes in each said planar member; said at least one shear member is inserted through a lower of said at least two mounting feature holes in said shank and through a lower of said at least two mounting feature holes in each said planar member; and said at least one shear member is further provided with at least one shear ensuring feature.

19. The ground working member of claim 11, wherein: said shank of said shank assembly further comprises a flat-sided curved shank having no lateral offset.

20. A method of manufacturing a tillage implement, comprising: attaching at least one row unit to the tillage implement; pivotally engaging at least one shank assembly including a shank with said at least one row unit and biasing said at least one shank assembly toward engagement with the ground using at least one spring member; connecting a tool assembly to each of said at least one shank assembly on a common vertical centerline by way of a symmetrically opposite planar member on each lateral side of said shank, said at least one shank assembly and said tool assembly being arranged on a common vertical centerline when said tool assembly is connected to said shank by way of said symmetrically opposite planar members; providing said shank with at least two mounting features; providing each said planar member with at least two matching mounting features; engaging a pivot member with one of said at least two mounting features of said shank and with one of said at least two matching mounting features of each said planar member; engaging at least one shear member with at least one of said at least two mounting features of said shank and with at least one of said at least two matching mounting features of each said planar member.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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 embodiments of the invention taken in conjunction with the accompanying drawings, wherein:

[0020] FIG. 1 is a front isometric view of a row unit, in accordance with an exemplary embodiment of the present invention;

[0021] FIG. 2A is an isometric view of a shank and fertilizer knife assembly, in accordance with an exemplary embodiment of the present invention;

[0022] FIG. 2B is a side view of a shank and fertilizer knife assembly, in accordance with an exemplary embodiment of the present invention;

[0023] FIG. 2C is a front view of a shank and fertilizer knife assembly, in accordance with an exemplary embodiment of the present invention;

[0024] FIG. 3A is an isometric view of a shank and front mounted chisel assembly, in accordance with an exemplary embodiment of the present invention;

[0025] FIG. 3B is a front view of a shank and front mounted chisel assembly, in accordance with an exemplary embodiment of the present invention;

[0026] FIG. 4A is an isometric view of a shank and strip till knife assembly, in accordance with an exemplary embodiment of the present invention; and

[0027] FIG. 4B is a front view of a shank and strip till knife assembly, in accordance with an exemplary embodiment of the present invention.

[0028] Corresponding reference characters indicate corresponding parts throughout the several views. The exemplifications set out herein illustrate embodiments of the invention, and such exemplifications are not to be construed as limiting the scope of the invention in any manner.

DETAILED DESCRIPTION OF THE INVENTION

[0029] The terms forward, rearward, left and right, are used principally throughout this specification for convenience but it is to be understood that these terms are not intended to be limiting. When used in connection with the tillage implement, row unit, shank assembly, and/or components thereof, these terms are usually determined with reference to the direction of forward operative travel of the tillage implement, but again, they should not be construed as limiting. The terms longitudinal and transverse are determined with reference to the fore-and-aft direction of the tillage implement and are equally not to be construed as limiting.

[0030] Referring now to the drawings, and more particularly to FIG. 1, there is shown a row unit 100 according to an embodiment of the present invention. The row unit 100 performs several functions as it moves in the travel direction 10, including displacing grass or residual crop material using the row cleaner assembly 120, breaking up, aerating, and/or fertilizing the soil using the shank assembly 150, closing the furrow and creating a berm using the sealing disc assembly 130, and breaking up clods and preparing the seedbed using the rolling basket assembly 140. The row unit 100 includes a row unit mount assembly 110 which clamps to the toolbar of a tillage implement (not shown), and which provides a point of attachment for each of the row cleaner assembly 120, the shank assembly 150, the sealing disc assembly 130, and the rolling basket assembly 140.

[0031] The row cleaner assembly 120 includes a row cleaner assembly mount 121, which may be pivotally connected to the row unit mount assembly 110. A row cleaner suspension 122 is connected to the row cleaner assembly mount 121. Two row cleaner wheels 123 are connected to the row cleaner suspension 122 at oblique angles, such that, as the row unit 100 moves in the travel direction 10, grass or residual crop material is moved to either side of the following shank assembly 150. The pivotal connection between the row cleaner assembly mount 121 and the row unit mount assembly 110 allows the two row cleaner wheels 123 to remain approximately centered before the following shank assembly 150 as the tillage implement turns. The row cleaner suspension 122 keeps the two row cleaner wheels 123 properly engaged with the ground as the depth of the following shank assembly 150 is varied, and as the tillage implement passes over ground irregularities.

[0032] The shank assembly 150 includes a shank 151 connected to the row unit mount assembly 110, and a tool assembly 200. In at least one embodiment of the present invention, the shank 151 may be connected to the row unit mount assembly 110 by way of shank pivot 152 and shank springs 153. In this way, resilient support is provided for the tool assembly 200 as the row unit 100 moves in travel direction 10 and the tool assembly 200 performs its function of breaking up, aerating, and/or fertilizing the soil. Upon contact between the tool assembly 200 and an excessively resistant item, such as a rock, the shank pivot 152 and shank springs 153 allow the shank 151 and tool assembly 200 to pivot back and upward to avoid breakage of the shank 151 or tool assembly 200. In other embodiments of the present invention, the shank 151 may be fixedly connected to the row unit mount assembly 110, so breakage of the shank 151 or tool assembly 200 is avoided by use of a shear member, and/or by substantial support of the tool assembly 200 against impact loads, as will be illustrated.

[0033] The sealing disc assembly 130 includes a sealing disc assembly frame 131, which is also pivotally connected to the row unit mount assembly 110. Sealing disc assembly springs 132 keep two sealing discs 133 properly engaged with the ground as the depth of the shank assembly 150 is varied, and as the tillage implement passes over ground irregularities. In this way, as the row unit 100 moves in the travel direction 10, the two sealing discs 133 perform their function of closing the furrow and creating a berm.

[0034] The rolling basket assembly 140 similarly includes a rolling basket assembly arm 141 pivotally connected to the row unit mount assembly 110. A rolling basket assembly spring 142 keeps the rolling basket 143 properly engaged with the ground as the depth of the shank assembly 150 is varied, and as the tillage implement passes over ground irregularities. In this way, as the row unit 100 moves in the travel direction 10, the rolling basket 143 performs its function of breaking up clods and preparing the seedbed.

[0035] Turning now to FIGS. 2A, 2B, and 2C, there is shown an embodiment of the present invention, a shank assembly 150 including a shank 151 and a tool assembly 200. The shank 151 is part of a modular system, such that tool assemblies of multiple configurations are easily adapted to connect to the shank 151 while preserving certain strength and alignment characteristics, as will be shown. In the embodiment of the present invention shown in FIGS. 2A, 2B, and 2C, the shank 151 describes part of an arc, extending from an approximately horizontal alignment where it connects to the shank pivot 152 of the row unit mount assembly 110 (not shown) in the travel direction 10, to approximately 20 from vertical in the downward direction. At its downward end, the shank 151 is provided with at least two mounting features, which may be holes. Two adapter plates 201 are attached to the shank 151 by way of matching mounting features, which may be holes, through which an adapter plate pivot bolt 202 and an adapter plate shear bolt 203 may be inserted as shown. The adapter plate pivot bolt 202 and adapter plate shear bolt 203 may be in the form of bolts, as shown, or may be in the form of pins, as a non-limiting example. Alternately, the mounting features of the shank 151 may be projecting cylindrical bosses, over which the holes in the two adapter plates are fitted, and with a cotter pin or similar device retained.

[0036] The tool assembly 200 is attached to the two adapter plates 201 by way of at least two further mounting features, which may again be holes and which match holes in the two adapter plates 201. An upper tool mounting bolt 204 and a lower tool mounting bolt 205 may inserted through the matching holes in the tool assembly 200 and in the two adapter plates 201. The upper tool mounting bolt 204 and lower tool mounting bolt 205 may again be in the form of bolts, as shown, or may be in the form of pins, as a non-limiting example. Further, the matching mounting features of the tool assembly 200 may alternately be projecting cylindrical bosses, over which projecting cylindrical bosses the holes in the two adapter plates 201 are fitted, and with a cotter pin or similar device retained.

[0037] The tool assembly 200, which in FIGS. 2A, 2B, and 2C is a fertilizer knife assembly 210, has a fertilizer knife blank 212 including the matching mounting features to which the two adapter plates 201 are attached by way of the upper tool mounting bolt 204 and lower tool mounting bolt 205. The fertilizer knife blank 212 extends downwards from its attachment to the two adapter plates 201, approximately at the surface line 12, to a lower terminus having a fertilizer knife point 211, approximately at depth line 14. The fertilizer knife assembly 210 may be provided with a fertilizer tube 213, through which fertilizer is delivered to the area of the depth line 14 following passage of the fertilizer knife point 211.

[0038] Considering particularly FIG. 2C, it can be seen that the shank assembly 150 and the tool assembly 200 share a common centerline C/L from the uppermost end of the shank 151 to the fertilizer knife point 211, unlike prior art side mounted fertilizer knives. Depending on the configuration of the tool assembly 200, spacers 214 may be required between the adapter plates 201 and the tool assembly 200. These spacers 214 may be welded to the fertilizer knife blank 212, or integrated therewith, or may be simply stacked next to the fertilizer knife blank 212. By arranging the shank 151 and the tool assembly 200 to have a common centerline from the uppermost end of the shank 151 to the fertilizer knife point 211, and by configuring the adapter plates 201 to be symmetric to one another, alignment of the tool assembly 200 to the shank 151, and thereby to the travel direction 10 of the tillage implement, is greatly improved. Furthermore, by arranging the shank 151 and the tool assembly 200 to have a common centerline from the uppermost end of the shank 151 to the fertilizer knife point 211, and by configuring the adapter plates 201 to be symmetric to one another, alignment of the tool assembly 200 to the shank 151 when under the stress of being pulled through potentially hard packed soil, is improved.

[0039] The relative thicknesses and cross sections of the fertilizer knife blank 212, the two adapter plates 201, and of the shank 151, along with the matching mounting features of the fertilizer knife blank 212, the two adapter plates 201, and of the shank 151, may be chosen in such a way that, upon contact of the tool assembly 200 with a hard object and failure of the shank assembly 150 to pivot up and over the hard object, the most likely outcome is shear of the second uppermost matching mounting feature, which in this embodiment of the present invention is the adapter plate shear bolt 203, at both planes of contact between the two adapter plates 201 and the shank 151. That is to say, the relative thickness and cross section of the shank 151 is substantial enough that any of the two adapter plates 201, the fertilizer knife blank 212, the upper and lower tool mounting bolts 204 and 205, the adapter plate pivot bolt 202, and the adapter plate shear bolt 203 will fail upon contact of the tool assembly 200 with a hard object and failure of the shank assembly 150 to pivot up and over the hard object, before the shank 151 will fail. The relative thickness and cross section of the two adapter plates 201 is substantial enough that any of the fertilizer knife blank 212, the upper and lower tool mounting bolts 204 and 205, the adapter plate pivot bolt 202, and the adapter plate shear bolt 203 will fail before the two adapter plates 201 will fail. The relative thickness and cross section of the fertilizer knife blank 212 is substantial enough that any of the upper and lower tool mounting bolts 204 and 205, the adapter plate pivot bolt 202, and the adapter plate shear bolt 203 will fail before the fertilizer knife blank 212 will fail.

[0040] In this case, upon contact of the tool assembly 200 with a hard object and failure of the shank assembly 150 to pivot up and over the hard object, and upon shear of the adapter plate shear bolt 203, the tool assembly 200 then pivots up and rearwards about the uppermost matching mounting feature, the adapter plate pivot bolt 202. In order to ensure that the adapter plate shear bolt 203 shears before the adapter plate pivot bolt 202, the upper tool mounting bolt 204, or the lower tool mounting bolt 205, as well as to ensure that the adapter plate shear bolt 203 shears before any of the shank 151, the adapter plates 201, or the tool assembly 200 are damaged, the adapter plate shear bolt 203 may be of a reduced diameter as compared to the adapter plate pivot bolt 202 and/or the upper tool mounting bolt 204 and lower tool mounting bolt 205. Alternately, the adapter plate shear bolt 203 may be provided with other shear features, such as a frangible score line or neck, or metallurgical properties that promote shear of the adapter plate shear bolt 203 in a controlled manner.

[0041] By providing a shank assembly 150 and tool assembly 200 that are symmetric about a common centerline C/L as illustrated in FIG. 2C, and by providing two adapter plates 201 that are symmetric to one another, even in the case of contact of the tool assembly 200 with a hard object and shear of the adapter plate shear bolt 203 at the planes of contact between the adapter plates 201 and the shank 151, the tool assembly 200 is prevented from twisting about its connections with the two adapter plates 201 and/or about the connection between the two adapter plates 201 and the shank 151, so that any tendency of the tool assembly 200 to bend as a result of being dragged sideways is minimized. In other words, upon shear of the adapter plate shear bolt 203, the two adapter plates 201 and the tool assembly 200 simply pivots up and rearwards about the uppermost matching mounting feature, the adapter plate pivot bolt 202, while remaining in the plane of the arc of the shank 151. Even in an embodiment of the present invention wherein the shank assembly 150 is rigidly connected to the row unit mount assembly 110 without any shank springs 153 or shank pivot 152 to allow the shank assembly 150 to pivot up and rearward, and/or even in an embodiment of the present invention wherein no adapter plate shear bolt 203 or other designated shear member is provided, providing a shank assembly 150 and tool assembly 200 that are symmetric about a common centerline C/L, and providing two adapter plates 201 that are symmetric to one another attaching the tool assembly 200 to the shank assembly results in substantially increased support of the tool assembly 200 against impact loads and reduction of damage and failures due to side loads and cleavage forces.

[0042] Turning now to FIGS. 3A and 3B, there is shown another embodiment of the present invention, a shank assembly 150 including a shank 151 and a tool assembly 200. The shank 151 again describes part of an arc, extending from an approximately horizontal alignment where it connects to the shank pivot 152 of the row unit mount assembly 110 (not shown) in the travel direction 10, to approximately 20 from vertical in the downward direction. At its downward end, the shank 151 is again provided with at least two mounting features, which may be holes. In lieu of the two adapter plates 201 of FIGS. 2A, 2B, and 2C, the tool assembly 200 shown in FIGS. 3A and 3B, which may be a front mounted chisel assembly 300, is provided with a single chisel point adapter 302 having matching mounting features on each of two chisel point adapter ears 302A and 302B, which matching mounting features may be holes. The chisel point adapter 302 and the chisel point adapter ears 302A and 302B may be cast, constructed as a weldment, or formed, as non-limiting examples. Chisel point adapter pivot bolt 303 is inserted through the upper holes of the single chisel point adapter ears 302A and 302B, and through the upper hole of the shank 151. Chisel point adapter shear bolt 304 is inserted through the lower holes of the single chisel point adapter ears 302A and 302B, and through the lower hole of the shank 151. The chisel point adapter pivot bolt 303 and the chisel point adapter shear bolt 304 may be in the form of bolts, as shown, or may be in the form of pins, as a non-limiting example. A chisel point 301 is then attached to the lower end of the chisel point adapter 302, so that the front mounted chisel assembly 300 extends downward from the surface line 12 approximately midway along the length of the chisel point adapter 302 to the depth line at the terminus of the chisel point 301.

[0043] Considering particularly FIG. 3B, it can be seen that the shank 151 and the tool assembly 200 again share a common centerline C/L from the uppermost end of the shank 151 to the lower end of the chisel point 301. By arranging the shank 151 and the chisel point adapter 302 and chisel point 301 of the front mounted chisel assembly 300 to have a common centerline in this way, and by configuring the chisel point adapter ears 302A and 302B to be symmetric about the shank 151, alignment of the front mounted chisel assembly 300 to the shank 151, and thereby to the travel direction 10 of the tillage implement, is greatly improved. Again, this is particularly advantageous when the tool assembly 200 is under the stress of being pulled through potentially hard packed soil.

[0044] As with the embodiment of the present invention shown in Figs. FIGS. 2A, 2B, and 2C, the relative thicknesses and cross sections of the shank 151 and the chisel point adapter ears 302A and 302B in the embodiment of the present invention shown in FIGS. 3A and 3B, along with the matching mounting features of shank 151 and the chisel point adapter ears 302A and 302B, may be chosen in such a way that, upon contact of the tool assembly 200 with a hard object and failure of the shank assembly 150 to pivot up and over the hard object, the most likely outcome is shear of the lower matching mounting feature, which in this embodiment of the present invention is the chisel point adapter shear bolt 304, at both planes of contact between the chisel point adapter ears 302A and 302B and the shank 151. That is to say, the relative thickness and cross section of the shank 151 is substantial enough that any of the chisel point adapter ears 302A and 302B, the chisel point adapter pivot bolt 303, and the chisel point adapter shear bolt 304 will fail upon contact of the tool assembly 200 with a hard object and failure of the shank assembly 150 to pivot up and over the hard object, before shank 151 will fail. The relative thickness and cross section of the chisel point adapter ears 302A and 302B is substantial enough that the chisel point adapter pivot bolt 303 or the chisel point adapter shear bolt 304 will fail before the chisel point adapter ears 302A and 302B will fail.

[0045] In this case, upon contact of the tool assembly 200 with a hard object and failure of the shank assembly 150 to pivot up and over the hard object, and upon shear of the chisel point adapter shear bolt 304, the tool assembly 200 then pivots up and rearwards about the uppermost matching mounting feature, the chisel point adapter pivot bolt 303. In order to ensure that the chisel point adapter shear bolt 304 shears before the chisel point adapter pivot bolt 303, as well as to ensure that the chisel point adapter shear bolt 304 shears before the shank 151 or the front mounted chisel assembly 300 is damaged, the chisel point adapter shear bolt 304 may again be of a reduced diameter as compared to the chisel point adapter pivot bolt 303. Alternately, the chisel point adapter shear bolt 304 may be provided with other shear features, such as a frangible score line or neck, or metallurgical properties that promote shear of the chisel point adapter shear bolt 304 in a controlled manner.

[0046] Again, by providing a shank 151 and front mounted chisel assembly 300 that are symmetric about a common centerline C/L as illustrated in FIG. 3B, including chisel point adapter ears 302A and 302B, even in case of contact of the front mounted chisel assembly 300 with a hard object and shear of the chisel point adapter shear bolt 304 at the planes of contact between the chisel point adapter ears 302A and 302B and the shank 151, the front mounted chisel assembly 300 is prevented from twisting about its connection with the shank 151, so that any tendency of the front mounted chisel assembly 300 to bend as a result of being dragged sideways is minimized. In other words, upon shear of the chisel point adapter shear bolt 304, the front mounted chisel assembly 300 simply pivots up and rearwards about the upper matching mounting feature, the chisel point adapter pivot bolt 303, while remaining in the plane of the arc of the shank 151. Clearance at the upper end of the chisel point adapter 302 between the chisel point adapter ears 302A and 302B is provided to facilitate the front mounted chisel assembly 300 pivoting up and rearwards in this way. Again, even in an embodiment of the present invention wherein the shank assembly 150 is rigidly connected to the row unit mount assembly 110 without any shank springs 153 or shank pivot 152 to allow the shank assembly 150 to pivot up and rearward, and/or even in an embodiment of the present invention wherein no chisel point adapter shear bolt 304 or other designated shear member is provided, providing a shank assembly 150 and tool assembly 200 that are symmetric about a common centerline C/L, and providing chisel point adapter ears 302A and 302B that are symmetric to one another attaching the chisel point adapter 302 of the tool assembly 200 to the shank assembly results in substantially increased support of the tool assembly 200 against impact loads and reduction of damage and failures due to side loads and cleavage forces.

[0047] Turning now to FIGS. 4A and 4B, there is shown another embodiment of the present invention, a shank assembly 150 including a shank 151 and a tool assembly 200. The shank 151 again describes part of an arc, extending from an approximately horizontal alignment where it connects to the shank pivot 152 of the row unit mount assembly 110 (not shown) in the travel direction 10, to approximately 20 from vertical in the downward direction. At its downward end, the shank 151 is again provided with at least two mounting features, which may be holes. Two adapter plates 201 are again attached to the shank 151 by way of matching mounting features, which may be holes, through which an adapter plate pivot bolt 202 and an adapter plate shear bolt 203 may be inserted as shown. The adapter plate pivot bolt 202 and adapter plate shear bolt 203 may be in the form of bolts, as shown, or may be in the form of pins, as a non-limiting example. Alternately, the mounting features of the shank 151 may again be projecting cylindrical bosses, over which the holes in the two adapter plates are fitted, and with a cotter pin or similar device retained.

[0048] The tool assembly 200 in FIGS. 4A and 4B is again attached to the two adapter plates 201 by way of at least two further mounting features, which may again be holes and which match holes in the two adapter plates 201. An upper tool mounting bolt 204 and a lower tool mounting bolt 205 may inserted through the matching holes in the tool assembly 200 and in the two adapter plates 201. The upper tool mounting bolt 204 and lower tool mounting bolt 205 may again be in the form of bolts, as shown, or may be in the form of pins, as a non-limiting example. Further, the matching mounting features of the tool assembly 200 may alternately be projecting cylindrical bosses, over which projecting cylindrical bosses the holes in the two adapter plates 201 are fitted, and with a cotter pin or similar device retained.

[0049] In the case of the embodiment of the present invention in FIGS. 4A and 4B, the tool assembly 200 is a strip till knife assembly 400 having a ripstrip shank 401 with the matching mounting features to which the two adapter plates 201 are attached by way of the upper tool mounting bolt 204 and lower tool mounting bolt 205. The ripstrip shank 401 extends downwards from its attachment to the two adapter plates 201, approximately at the surface line 12, to a lower terminus having a strip till knife point 402, approximately at depth line 14. The strip till knife assembly 400 may be provided with a fertilizer tube 403, through which fertilizer is delivered to the area of the depth line 14 following passage of the strip till knife point 402.

[0050] Considering the front view of the present embodiment of the invention shown in FIG. 4B, the shank assembly 150 and the tool assembly 200 again share a common centerline C/L from the uppermost end of the shank 151 to the strip till knife point 402. Depending on the configuration of the tool assembly 200, spacers 214 may again be required between the adapter plates 201 and the tool assembly 200. These spacers 214 may again be welded to the ripstrip shank 401, or integrated therewith, or may be simply stacked next to the ripstrip shank 401. By arranging the shank 151 and the tool assembly 200 to have a common centerline from the uppermost end of the shank 151 to the strip till knife point 402, and by configuring the adapter plates 201 to be symmetric to one another, alignment of the tool assembly 200 to the shank 151, and thereby to the travel direction 10 of the tillage implement, is greatly improved, particularly when under the stress of being pulled through hard packed soil.

[0051] The relative thicknesses and cross sections of the ripstrip shank 401, the two adapter plates 201, and of the shank 151, along with the matching mounting features of the ripstrip shank 401, the two adapter plates 201, and of the shank 151, may again be chosen in such a way that, upon contact of the tool assembly 200 with a hard object and failure of the shank assembly 150 to pivot up and over the hard object, the most likely outcome is shear of the second uppermost matching mounting feature, which in this embodiment of the present invention is the adapter plate shear bolt 203, at both planes of contact between the two adapter plates 201 and the shank 151. As before, that is to say that the relative thickness and cross section of the shank 151 is substantial enough that any of the two adapter plates 201, the ripstrip shank 401, the upper and lower tool mounting bolts 204 and 205, the adapter plate pivot bolt 202, and the adapter plate shear bolt 203 will fail upon contact of the tool assembly 200 with a hard object and failure of the shank assembly 150 to pivot up and over the hard object, before the shank 151 will fail. The relative thickness and cross section of the two adapter plates 201 is substantial enough that any of the ripstrip shank 401, the upper and lower tool mounting bolts 204 and 205, the adapter plate pivot bolt 202, and the adapter plate shear bolt 203 will fail before the two adapter plates 201 will fail. The relative thickness and cross section of the ripstrip shank 401 is substantial enough that any of the upper and lower tool mounting bolts 204 and 205, the adapter plate pivot bolt 202, and the adapter plate shear bolt 203 will fail before the ripstrip shank 401 will fail.

[0052] Once again, upon contact of the tool assembly 200 with a hard object and failure of the shank assembly 150 to pivot up and over the hard object, and upon shear of the adapter plate shear bolt 203, the tool assembly 200 then pivots up and rearwards about the uppermost matching mounting feature, the adapter plate pivot bolt 202. In order to ensure that the adapter plate shear bolt 203 shears before the adapter plate pivot bolt 202, the upper tool mounting bolt 204, or the lower tool mounting bolt 205, as well as to ensure that the adapter plate shear bolt 203 shears before any of the shank 151, the adapter plates 201, or the tool assembly 200 are damaged, the adapter plate shear bolt 203 may be of a reduced diameter as compared to the adapter plate pivot bolt 202 and/or the upper tool mounting bolt 204 and lower tool mounting bolt 205. Alternately, the adapter plate shear bolt 203 may be provided with other shear features, such as a frangible score line or neck, or metallurgical properties that promote shear of the adapter plate shear bolt 203 in a controlled manner.

[0053] As with the embodiments of the present invention in FIGS. 2A, 2B, 2C, 3A, and 3B, by providing a shank assembly 150 and tool assembly 200 that are symmetric about a common centerline C/L as illustrated in FIG. 4B, and by providing two adapter plates 201 that are symmetric to one another, even in the case of contact of the tool assembly 200 with a hard object and shear of the adapter plate shear bolt 203 at the planes of contact between the adapter plates 201 and the shank 151, the tool assembly 200 is prevented from twisting about its connections with the two adapter plates 201 and/or about the connection between the two adapter plates 201 and the shank 151, so that any tendency of the tool assembly 200 to bend as a result of being dragged sideways is minimized. In other words, upon shear of the adapter plate shear bolt 203, the two adapter plates 201 and the tool assembly 200 simply pivots up and rearwards about the uppermost matching mounting feature, the adapter plate pivot bolt 202, while remaining in the plane of the arc of the shank 151. Again, even in an embodiment of the present invention wherein the shank assembly 150 is rigidly connected to the row unit mount assembly 110 without any shank springs 153 or shank pivot 152 to allow the shank assembly 150 to pivot up and rearward, and/or even in an embodiment of the present invention wherein no adapter plate shear bolt 203 or other designated shear member is provided, providing a shank assembly 150 and tool assembly 200 that are symmetric about a common centerline C/L, and providing two adapter plates 201 that are symmetric to one another attaching the tool assembly 200 to the shank assembly results in substantially increased support of the tool assembly 200 against impact loads and reduction of damage and failures due to side loads and cleavage forces.

[0054] 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.