CA1181980A - Cultivator blade - Google Patents
Cultivator bladeInfo
- Publication number
- CA1181980A CA1181980A CA000391982A CA391982A CA1181980A CA 1181980 A CA1181980 A CA 1181980A CA 000391982 A CA000391982 A CA 000391982A CA 391982 A CA391982 A CA 391982A CA 1181980 A CA1181980 A CA 1181980A
- Authority
- CA
- Canada
- Prior art keywords
- blade
- leading
- trailing
- planar portion
- channel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
- A01B35/00—Other machines for working soil not specially adapted for working soil on which crops are growing
- A01B35/20—Tools; Details
- A01B35/22—Non-rotating tools; Resilient or flexible mounting of rigid tools
- A01B35/26—Rigid tools
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Soil Sciences (AREA)
- Environmental Sciences (AREA)
- Soil Working Implements (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
Apparatus for tilling, weeding and generally working soil comprises a blade having a leading planar portion with ends. This portion declines forwardly from the horizontal along a long axis and includes a broad, slightly curvilinear leading edge disposed in the plane of the leading portion. The blade is strengthened by means of a trailing portion extending rearwardly from the leading portion and downwardly along the long axis to define a reinforcing gusset. A tang in the form of a U-shaped in-verted channel, centrally disposed on the trailing portion, further reinforces the blade by means of trailing edges converging inwardly and rearwardly from the ends to the channel and joining corresponding side walls of the channel at curvilinear gussets. The blade structure is non-ggressive which forces fewer rocks and stones to the surface and provides a flat, shallow cut that remains uniform despite blade wear.
Apparatus for tilling, weeding and generally working soil comprises a blade having a leading planar portion with ends. This portion declines forwardly from the horizontal along a long axis and includes a broad, slightly curvilinear leading edge disposed in the plane of the leading portion. The blade is strengthened by means of a trailing portion extending rearwardly from the leading portion and downwardly along the long axis to define a reinforcing gusset. A tang in the form of a U-shaped in-verted channel, centrally disposed on the trailing portion, further reinforces the blade by means of trailing edges converging inwardly and rearwardly from the ends to the channel and joining corresponding side walls of the channel at curvilinear gussets. The blade structure is non-ggressive which forces fewer rocks and stones to the surface and provides a flat, shallow cut that remains uniform despite blade wear.
Description
~ACKGROUND OF THE INV~NTION
rl'his invention relates to a cul.tivator blade and more particularly -to a cul-tiva-tor blade having a rein:~orced body with a broad cu-tting edge.
Cul~iva-tor blades are well lcnown devices in the agriculture ar-t and are commonly referred to by various terminology, including the terms sweeps and shovels. The structure to which such terminology applies varies from -that of a fla-t blade having a chisel shaped leading edge to a V-sha.ped blade with similar chisel shaped leading edges that define a V-outline.
Regardless of the shape, the purpose of these ; blades is to till the soil, not only for aeration purposes but also to mee-t the general requirements of cultivation by cutting weeds to control weed growth. Moreover, the attain-ment of these objectives is e~pected to be achieved with rugged and durable blades having a long service life.
Flat blades meet these requirements handily since they provide a flat, shallow cut tha-t remains generally uniform in width despite blade wear and because mos-t weeds tend to be cut by -the broad cutting edge of the blade ra-ther than being deflected as occurs in the case of angled blades.
A problem e~peri.enced with fla-t blades, however, is that unless the blade struc-ture is specially reinforced, which reinforcement could hamper the cul-tiva-tor action, these blades can be bent out oE the flat plane which will result .in poor cul-tiva-tor action.
V-shaped blades are inherently stronger and are tll~refore less prone to bending~ although it is not uncommon 3() ~o.r the extended free ends of such blades to be bent in -the ;~
course of use. O-ther problems experiencecl by these blades inclu~e a tendency to skew to one sicl! as a result of un-even forces applied to a plurality of ~3uch blades mounted on a cultivator implemen-t. The problem is correctable but requires a prede-termined posi-tioning of the blacles which may no-t be co~patible under the particular conditions of use. Another problem includes a tendency for such blades to hook under a buried obstruction such as a rock and to unearth it which requires a subsequen-t operation of clearing the field. Moreover, variations in dragging pres-sure produce variations in cultivation depth, resul-ting in a series of sawtooth furrows of uneven dep-th.
Problems experienced wi-th any angled cultivator blade include an inability to cut tougher weeds which tend to deElect off the leading edges of -the angled blade. This condition is further agyravated with blade wear which can result in furrows narrowing as blades wear so -that overlap between a~jacent blades may be lost wllereby the space there-between remains untilled and the weeds left standing.
SUMMARY OF' THE INVENTION
.... . . ~
A principal object of the presen-t inven-tion is to provide acul-tivator blade having a broad leading edge -that will cu-t rather than deflect weeds.
Another provision o~ the invention is a blade that will maintain a wi~-th of cut as it wears.
Sti:lL another provision of the invention is a blade th.lt E)rov:lcles a flat, ~sha:LIow cu-t.
Yet ano-ther prov:ision of the invention is a blade ~0 tlav:ing a reinforced structure that is resistant to deformation.
Stlll another provision of the invention is a blade that has little or no tendency to skew.
Still another provision of the invention is a blade that may be mounted on the shank of a cultivator im-plemen-t at vi.rtually any angle w:ithout inducing a tendency to hook under any buried obstructions.
Yet another provision of the invention is a.
blade that is easy to stack and which is provided without sharp corners so that it is safer to handle.
Yet another provision of the invention is a blade that may be used in combination with other such blades -to replace a rod-weeder.
The problems associated with the prior art may be substantially overcome and the foregoing objectives achieved by recourse to my invention which is a non-aggressive cultivator blade having a reinforced unitary body that com-prises, a leading planar portion declining forwardly from the horizontal along a long axis with a broad, slightly curvilinear leading edge disposed in the plane thereof. ~trail~
lng ~l.anar por-tion o.E the body ex-tends rearwardly from the long axis of the leading portion and declines from the horizontal along the axis to form a reinforcing gusset with the leading planar portion. The blade also comprises means for centrally mounting the blade on one shank of an agricultural implement.
DE:SCRIPTION OF T~IE DRAWINGS
__~ _ _ The invention will now be more particularly de-scribecl wlth ref.erence to an embodiment thereof shown, by way of example, in the accompanying drawi.ngs in which:
Fig. 1 is a perspective view of a cultivator blade ~3 according -to the present invention;
Fig. 2 is a front elevation view -thereof;
Fig. 3 is a right~hand side elevat.ion view thereof;
Fig. 4 is a left-hand side elevation view thereof;
Fig. 5 is a rear elevation view thereof;
Fig. 6 is a top plan view thereof; and Fig. 7 is a bottom plan view thereof.
DE'SCRIPTION OF THE ILLUSTRATED EMB~DIMENT
An embodiment of the present invention appears in the drawings as a non-aggressive cultivator blade 10 having a reinforced unitary body 11. As shown throughout the ~igures,the body 11 will be seen to comprise a leading planar portion 12 having ends 13. As best shown in Figs. 6 and 7, the ends 13 sweep back from a leading edge 14 and converge in the direction of an axis oE symmetry 15 intermediate the edge 14 and a cor-responding trailing edge 16.
Declining forwardly from the horizontal, the leading portion 12 is shown with its edge 14 disposed in the plane thereof. Although substantially straight, it will be observed that the edge 14 is slightly curvilinear and is swept back slightly ahout the axis 15 towards a planar trailing portion 17.
The -trailing por-tion 17 extends rearwardly from a long axis 1.~ o:E -the blade. Referrillg -to Fig. 7 in this regard, .it wi].l be observed -tllat the axis ~ in fact comprises a sub-stantially straight line between -the leading and trailing port.ions 1.2 and :17, respectively, and consti-tutes a line about which said portions decline from the horizon-tal. ~n this regard, it wil.l. be unders-tood that the trailing portion 17 forms, in ~ ' ......
combina-tion with the leading portion 12, a reinEorcing gusset for the blade 10. This gusset feature streng-thens -the body 11 and minimizes the possibili-ty of bending -the leading por-tion 12 out of its plane should a buriecl ob-struction be hit in the course of blade use~
Means for mounting the blade 10 on a shank oE an ayricultural implement (no-t shown) is provided in -the form of a tang 20 tha-t is centrally disposed on the -trailing por-tion 17 in integral relation therewith. It will be noted that the tang 20 aomprises an lnverted U-shaped channel that extends upwardly and rearwardly from the trailing portion 17.
Various conventional means of mounting the tang 20 to the shank (not shown) are known. In this regard, -the free end of the shank would be apertured to correspond to aper-tures 21 which are formed in a known manner to accept a carriage bolt (not shown) which, in combination with a con-ventional nu-t, -Fastens the blade 10 securely to the shank.
Since the tang 20 comprises an inverted U-shaped channel, such channel could be adapted -to fit snugly on the ~0 shank. In this arrangement only one mounting nu-t and bolt would suffice al-though -two apertures are shown in -the tang 20 -to provide a more secure moun-ting arrangemen-t.
Further reinforcement of the blade 10 is provided y means of a curvilinear reinforcing gusset 23 -that is `
~ormed at the junction of tha -tang 20 and the -trailing por-tlon 17. [t will be observed -that the gusse-ts 23 are dis-L)osed sytmnetrically about the axis 15 with each gusset being decilled by an innermost end portion of -the edge 16 and a correspond:iny edge of the side walls of the -tang 20. In-~0 creast!d strengl:h of -the gussets 23 is provided by converging the trailing edyes L6 inwaxdly and rearwardly towards the side walls of the tang, -thereby ob-ta:ining a blade width that is substantia]ly grea-ter adjacent the axis 15 than at each end 13.
A further advantageto beob-tained from-this struc-tural feature is to reduce -the amount of raw material required over tha-t used if the blade was of substan-tially constant width. In addition, reference -to Fig. 5 shows a positive ~ihedral angle 22 formed between theplane ofeach edge16 and the plane of the edcJe 1~. This provides better blade control since the leading edge 14 is the only one directly involved in the -tilling action. Furthermore~ less drag results from lif-ting the trailing edges16 out of the plane of the leading edge 14, thereby making the blade 10 more energy efficen-t in -terms of fuel required to draw a cultivator equipped with a plurality of blades 10~ Theangle 22 is about two degrees.
The blade 10 has been described as a non-aggressive blade in order to distinguish its mode of operation from that of conventional blades. In this regard, the blade 10 will be understood tobe a straight blade compared with the pointed, V-shaped blades of the prior art. Thus, whereas a pointed blade wlll -tend -to hook onto a buried obstruction such as a roc~ or roo-t, wi-th possible damage to the blade or implement to which it is attached, the s-traight ~lade of -the embodiment described herein will tend to push the obstruction down, thereby riding over the obstruction and avoiding -the hang-up condition experienced~by the pointed blade. A fur-ther benefit ~-lel::ived Erom this ac-tion is that the blade 10 will bring fewer stolles t:o the surface resulting in a cleaner field than that o~tainclble wi-th pointed cultivator blades. Moreover, the single tany mountincJ permits the blade 10 to pivot abou-t the axis 15 which facilitates avoidiny the hang-up condition b~ allowing the ends 13 to move as much as three to four inches.
In view of the non-aggressive ac-tion of the blade lU, -the pitch of the shank to which -the blade is connected is not critical and allows a grea-ter la-titude in pi-tch setting to accommodate various soil conditions. Although not readily a~parent from the drawings, it will ~e urlcler-stood that a longer service life may be obtained by forming the leading edge 14 so that in cross-sec-tion the edge :is uniformly radiused. Since -the broad face of -the blade lO
does not have a tendency to deflect weeds, an effective weed cu-tting action may be obtained without recourse to a chisel shaped edge which wears faster. Moreover, as the blade lO wears, its width of cut remains subs-tan-tially the same thereby maintaining its effec-tiveness in weed eradica--tion over its entire service life~ O-ther benefits attri-butable directly to the broad cutting edge of the blade lO
include a flat, shallow cut that avoids the saw-tootllcd seed bed cut of pointed blades while the full width of the rein-for~cing gusset structure provides improved soil aeration, bo-th features being similar to -those found in the more ex-pensive rod-weede:r.
It will be apparent to those skilled in the art that the emL)odimerlt here:i.nabove descri.L)ecl may b(~ sul~-stantiall.y varied -to meet specialized requlrements withou-t depar-ting from the spirit and scope of the invention. The embodiment disclosed is therefore no-t to be -taken as limi-t:ing but rathe.r as an exemplary structure of the inven-tion which :is deEined by the claims appended hereto.
rl'his invention relates to a cul.tivator blade and more particularly -to a cul-tiva-tor blade having a rein:~orced body with a broad cu-tting edge.
Cul~iva-tor blades are well lcnown devices in the agriculture ar-t and are commonly referred to by various terminology, including the terms sweeps and shovels. The structure to which such terminology applies varies from -that of a fla-t blade having a chisel shaped leading edge to a V-sha.ped blade with similar chisel shaped leading edges that define a V-outline.
Regardless of the shape, the purpose of these ; blades is to till the soil, not only for aeration purposes but also to mee-t the general requirements of cultivation by cutting weeds to control weed growth. Moreover, the attain-ment of these objectives is e~pected to be achieved with rugged and durable blades having a long service life.
Flat blades meet these requirements handily since they provide a flat, shallow cut tha-t remains generally uniform in width despite blade wear and because mos-t weeds tend to be cut by -the broad cutting edge of the blade ra-ther than being deflected as occurs in the case of angled blades.
A problem e~peri.enced with fla-t blades, however, is that unless the blade struc-ture is specially reinforced, which reinforcement could hamper the cul-tiva-tor action, these blades can be bent out oE the flat plane which will result .in poor cul-tiva-tor action.
V-shaped blades are inherently stronger and are tll~refore less prone to bending~ although it is not uncommon 3() ~o.r the extended free ends of such blades to be bent in -the ;~
course of use. O-ther problems experiencecl by these blades inclu~e a tendency to skew to one sicl! as a result of un-even forces applied to a plurality of ~3uch blades mounted on a cultivator implemen-t. The problem is correctable but requires a prede-termined posi-tioning of the blacles which may no-t be co~patible under the particular conditions of use. Another problem includes a tendency for such blades to hook under a buried obstruction such as a rock and to unearth it which requires a subsequen-t operation of clearing the field. Moreover, variations in dragging pres-sure produce variations in cultivation depth, resul-ting in a series of sawtooth furrows of uneven dep-th.
Problems experienced wi-th any angled cultivator blade include an inability to cut tougher weeds which tend to deElect off the leading edges of -the angled blade. This condition is further agyravated with blade wear which can result in furrows narrowing as blades wear so -that overlap between a~jacent blades may be lost wllereby the space there-between remains untilled and the weeds left standing.
SUMMARY OF' THE INVENTION
.... . . ~
A principal object of the presen-t inven-tion is to provide acul-tivator blade having a broad leading edge -that will cu-t rather than deflect weeds.
Another provision o~ the invention is a blade that will maintain a wi~-th of cut as it wears.
Sti:lL another provision of the invention is a blade th.lt E)rov:lcles a flat, ~sha:LIow cu-t.
Yet ano-ther prov:ision of the invention is a blade ~0 tlav:ing a reinforced structure that is resistant to deformation.
Stlll another provision of the invention is a blade that has little or no tendency to skew.
Still another provision of the invention is a blade that may be mounted on the shank of a cultivator im-plemen-t at vi.rtually any angle w:ithout inducing a tendency to hook under any buried obstructions.
Yet another provision of the invention is a.
blade that is easy to stack and which is provided without sharp corners so that it is safer to handle.
Yet another provision of the invention is a blade that may be used in combination with other such blades -to replace a rod-weeder.
The problems associated with the prior art may be substantially overcome and the foregoing objectives achieved by recourse to my invention which is a non-aggressive cultivator blade having a reinforced unitary body that com-prises, a leading planar portion declining forwardly from the horizontal along a long axis with a broad, slightly curvilinear leading edge disposed in the plane thereof. ~trail~
lng ~l.anar por-tion o.E the body ex-tends rearwardly from the long axis of the leading portion and declines from the horizontal along the axis to form a reinforcing gusset with the leading planar portion. The blade also comprises means for centrally mounting the blade on one shank of an agricultural implement.
DE:SCRIPTION OF T~IE DRAWINGS
__~ _ _ The invention will now be more particularly de-scribecl wlth ref.erence to an embodiment thereof shown, by way of example, in the accompanying drawi.ngs in which:
Fig. 1 is a perspective view of a cultivator blade ~3 according -to the present invention;
Fig. 2 is a front elevation view -thereof;
Fig. 3 is a right~hand side elevat.ion view thereof;
Fig. 4 is a left-hand side elevation view thereof;
Fig. 5 is a rear elevation view thereof;
Fig. 6 is a top plan view thereof; and Fig. 7 is a bottom plan view thereof.
DE'SCRIPTION OF THE ILLUSTRATED EMB~DIMENT
An embodiment of the present invention appears in the drawings as a non-aggressive cultivator blade 10 having a reinforced unitary body 11. As shown throughout the ~igures,the body 11 will be seen to comprise a leading planar portion 12 having ends 13. As best shown in Figs. 6 and 7, the ends 13 sweep back from a leading edge 14 and converge in the direction of an axis oE symmetry 15 intermediate the edge 14 and a cor-responding trailing edge 16.
Declining forwardly from the horizontal, the leading portion 12 is shown with its edge 14 disposed in the plane thereof. Although substantially straight, it will be observed that the edge 14 is slightly curvilinear and is swept back slightly ahout the axis 15 towards a planar trailing portion 17.
The -trailing por-tion 17 extends rearwardly from a long axis 1.~ o:E -the blade. Referrillg -to Fig. 7 in this regard, .it wi].l be observed -tllat the axis ~ in fact comprises a sub-stantially straight line between -the leading and trailing port.ions 1.2 and :17, respectively, and consti-tutes a line about which said portions decline from the horizon-tal. ~n this regard, it wil.l. be unders-tood that the trailing portion 17 forms, in ~ ' ......
combina-tion with the leading portion 12, a reinEorcing gusset for the blade 10. This gusset feature streng-thens -the body 11 and minimizes the possibili-ty of bending -the leading por-tion 12 out of its plane should a buriecl ob-struction be hit in the course of blade use~
Means for mounting the blade 10 on a shank oE an ayricultural implement (no-t shown) is provided in -the form of a tang 20 tha-t is centrally disposed on the -trailing por-tion 17 in integral relation therewith. It will be noted that the tang 20 aomprises an lnverted U-shaped channel that extends upwardly and rearwardly from the trailing portion 17.
Various conventional means of mounting the tang 20 to the shank (not shown) are known. In this regard, -the free end of the shank would be apertured to correspond to aper-tures 21 which are formed in a known manner to accept a carriage bolt (not shown) which, in combination with a con-ventional nu-t, -Fastens the blade 10 securely to the shank.
Since the tang 20 comprises an inverted U-shaped channel, such channel could be adapted -to fit snugly on the ~0 shank. In this arrangement only one mounting nu-t and bolt would suffice al-though -two apertures are shown in -the tang 20 -to provide a more secure moun-ting arrangemen-t.
Further reinforcement of the blade 10 is provided y means of a curvilinear reinforcing gusset 23 -that is `
~ormed at the junction of tha -tang 20 and the -trailing por-tlon 17. [t will be observed -that the gusse-ts 23 are dis-L)osed sytmnetrically about the axis 15 with each gusset being decilled by an innermost end portion of -the edge 16 and a correspond:iny edge of the side walls of the -tang 20. In-~0 creast!d strengl:h of -the gussets 23 is provided by converging the trailing edyes L6 inwaxdly and rearwardly towards the side walls of the tang, -thereby ob-ta:ining a blade width that is substantia]ly grea-ter adjacent the axis 15 than at each end 13.
A further advantageto beob-tained from-this struc-tural feature is to reduce -the amount of raw material required over tha-t used if the blade was of substan-tially constant width. In addition, reference -to Fig. 5 shows a positive ~ihedral angle 22 formed between theplane ofeach edge16 and the plane of the edcJe 1~. This provides better blade control since the leading edge 14 is the only one directly involved in the -tilling action. Furthermore~ less drag results from lif-ting the trailing edges16 out of the plane of the leading edge 14, thereby making the blade 10 more energy efficen-t in -terms of fuel required to draw a cultivator equipped with a plurality of blades 10~ Theangle 22 is about two degrees.
The blade 10 has been described as a non-aggressive blade in order to distinguish its mode of operation from that of conventional blades. In this regard, the blade 10 will be understood tobe a straight blade compared with the pointed, V-shaped blades of the prior art. Thus, whereas a pointed blade wlll -tend -to hook onto a buried obstruction such as a roc~ or roo-t, wi-th possible damage to the blade or implement to which it is attached, the s-traight ~lade of -the embodiment described herein will tend to push the obstruction down, thereby riding over the obstruction and avoiding -the hang-up condition experienced~by the pointed blade. A fur-ther benefit ~-lel::ived Erom this ac-tion is that the blade 10 will bring fewer stolles t:o the surface resulting in a cleaner field than that o~tainclble wi-th pointed cultivator blades. Moreover, the single tany mountincJ permits the blade 10 to pivot abou-t the axis 15 which facilitates avoidiny the hang-up condition b~ allowing the ends 13 to move as much as three to four inches.
In view of the non-aggressive ac-tion of the blade lU, -the pitch of the shank to which -the blade is connected is not critical and allows a grea-ter la-titude in pi-tch setting to accommodate various soil conditions. Although not readily a~parent from the drawings, it will ~e urlcler-stood that a longer service life may be obtained by forming the leading edge 14 so that in cross-sec-tion the edge :is uniformly radiused. Since -the broad face of -the blade lO
does not have a tendency to deflect weeds, an effective weed cu-tting action may be obtained without recourse to a chisel shaped edge which wears faster. Moreover, as the blade lO wears, its width of cut remains subs-tan-tially the same thereby maintaining its effec-tiveness in weed eradica--tion over its entire service life~ O-ther benefits attri-butable directly to the broad cutting edge of the blade lO
include a flat, shallow cut that avoids the saw-tootllcd seed bed cut of pointed blades while the full width of the rein-for~cing gusset structure provides improved soil aeration, bo-th features being similar to -those found in the more ex-pensive rod-weede:r.
It will be apparent to those skilled in the art that the emL)odimerlt here:i.nabove descri.L)ecl may b(~ sul~-stantiall.y varied -to meet specialized requlrements withou-t depar-ting from the spirit and scope of the invention. The embodiment disclosed is therefore no-t to be -taken as limi-t:ing but rathe.r as an exemplary structure of the inven-tion which :is deEined by the claims appended hereto.
Claims (9)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A non-aggressive cultivator blade having a reinforced unitary body comprising:
a leading planar portion declining forwardly from the horizontal along a long axis with a broad slightly curvilinear leading edge disposed in the plane thereof a trailing planar portion extending rearwardly from the long axis of the leading portion and declining from the horizontal along the axis to form a reinforcing gusset with the leading planar portion; and means for mounting said blade centrally thereof on one shank of an agricultural implement.
a leading planar portion declining forwardly from the horizontal along a long axis with a broad slightly curvilinear leading edge disposed in the plane thereof a trailing planar portion extending rearwardly from the long axis of the leading portion and declining from the horizontal along the axis to form a reinforcing gusset with the leading planar portion; and means for mounting said blade centrally thereof on one shank of an agricultural implement.
2. A blade as claimed in Claim 1 wherein the leading edge is uniformly radiused in cross-section.
3. A blade as claimed in Claim 2 wherein said means for mounting comprises a tang portion centrally dis-posed in integral relation with said trailing planar portion and extending upwardly and rearwardlytherefrom.
4. A blade as claimed in Claim 3 wherein said tang portion comprises an inverted U-shaped channel having an apertured side wall adapted to receive at least one mounting bolt.
5. A blade as claimed in Claim 4 wherein the leading edge is slightly swept back about an axis of symmetry of the blade towards the trailing planar portion.
6. A blade as claimed in Claim 5 wherein the trailing planar portion includes a trailing edge disposed synmetrically on each side of said channel, each such edge converging inwardly and rearwardly towards said channel and forming a curvilinear reinforcing gusset at a corresponding side wall thereof.
7. A blade as described in Claim 6 wherein each trailing edge is inclined relative to the plane of the leading edge to form a positive dihedral angle therewith.
8. A blade as claimed in Claim 7 wherein the width thereof is substantially greater adjacent the axis of symmetry than at each free end of the body.
9. A blade as claimed in Claim 8 wherein the dihedral angle is about two degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000391982A CA1181980A (en) | 1981-12-10 | 1981-12-10 | Cultivator blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000391982A CA1181980A (en) | 1981-12-10 | 1981-12-10 | Cultivator blade |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1181980A true CA1181980A (en) | 1985-02-05 |
Family
ID=4121591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000391982A Expired CA1181980A (en) | 1981-12-10 | 1981-12-10 | Cultivator blade |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1181980A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4850435A (en) * | 1987-02-24 | 1989-07-25 | Morris Rob-Weeder Company, Ltd. | Cultivator sweep with pair of rearwardly extending downturned rigid flaps |
-
1981
- 1981-12-10 CA CA000391982A patent/CA1181980A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4850435A (en) * | 1987-02-24 | 1989-07-25 | Morris Rob-Weeder Company, Ltd. | Cultivator sweep with pair of rearwardly extending downturned rigid flaps |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |