CA2127028A1 - Root cutting shovel blade - Google Patents
Root cutting shovel bladeInfo
- Publication number
- CA2127028A1 CA2127028A1 CA002127028A CA2127028A CA2127028A1 CA 2127028 A1 CA2127028 A1 CA 2127028A1 CA 002127028 A CA002127028 A CA 002127028A CA 2127028 A CA2127028 A CA 2127028A CA 2127028 A1 CA2127028 A1 CA 2127028A1
- Authority
- CA
- Canada
- Prior art keywords
- cutting
- spaced apart
- cutting teeth
- array
- concave surface
- 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.)
- Abandoned
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
- A01B1/00—Hand tools
- A01B1/02—Spades; Shovels
- A01B1/04—Spades; Shovels with teeth
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Soil Sciences (AREA)
- Environmental Sciences (AREA)
- Component Parts Of Construction Machinery (AREA)
Abstract
A root cutting shovel blade has a first concave surface extending between a longitudinally aligned handle shank and a radially spaced apart array of cutting teeth spaced apart around a curved edge of the first concave surface opposed to the handle shank, an opposed pair of side edges extending around the first concave surface between the handle shank and the curved edge of the first concave surface opposed to the handle shank, the radially spaced apart array of cutting teeth having stamped thereon a correspon-ding substantially parallel spaced apart array of longitudinal creases so as to form a corresponding substantially parallel spaced apart array of second concave surfaces on the radially spaced apart array of cutting teeth, one of the second concave surfaces per tooth of the array of cutting teeth, wherein the cutting teeth have curvilinear cutting edges.
Description
ROOT CUTTING ~nuv~ BLADE
Field of the Invention 5This invention relates to the field of garden tools and in particular to an improved root cutting shovel.
Background of the Invention 10Applicant is aware of French Patent No. 830,902 which issued to Mercier on August 12, 1938, which patent discloses a shovel blade having serrated tapered edges and in particular tines or teeth formed in the soil engaging end of the shovel blade. The tines or teeth are formed with a depression running 15longitudinally along each tine or tooth. ;
Similarly, United States Patent No. 1,263,949 which issued to Singer on April 23, 1918, United States Patent No.
Field of the Invention 5This invention relates to the field of garden tools and in particular to an improved root cutting shovel.
Background of the Invention 10Applicant is aware of French Patent No. 830,902 which issued to Mercier on August 12, 1938, which patent discloses a shovel blade having serrated tapered edges and in particular tines or teeth formed in the soil engaging end of the shovel blade. The tines or teeth are formed with a depression running 15longitudinally along each tine or tooth. ;
Similarly, United States Patent No. 1,263,949 which issued to Singer on April 23, 1918, United States Patent No.
2,594,598 which issued to Timmins on April 29, 1952, and French 20Patent No. 2,388,472 which issued to Tanguy on December 29, 1978, all disclose shovel blades having teeth or tines formed in the soil engaging end of the shovel blade for cutting roots and the like.
25Each of the prior art instruments above described cut roots by the action of forcing the shovel blade against the roots in a direction substantially parallel to the longitudinal axis of the shovel handle so as to thereby cut through roots caught between the teeth or tines. The roots are brought against a 30sharpened edge of the shovel blade between the teeth or tines and thereby cut merely by the thrusting force acting on the shovel.
It has been found that the root cutting ability of a shovel blade having teeth or tines extending forward from the 35soil engaging end of the shovel blade or formed therein so as to leave "V" shaped notches between the teeth or tines, may be improved by a shovel blade according to the present invention.
Consequently it is an object of the present invention to provide a shovel blade having teeth extending forward from, or formed in, the soil engaging end of the shovel blade wherein the teeth cutting edges which are twisted longitudinally to provide a shearing cutting action as the twisted cutting edges are forced into cutting engagement with roots.
SummarY of the Invention A root cutting shovel blade has a first concave surface extending between a longitudinally aligned handle shank and a radially spaced apart array of cutting teeth, the cutting teeth spaced apart around a curved edge of the first concave surface opposed to the handle shank. An opposed pair of side edges extends around the first concave surface between the handle shank and the curved edge of the first concave surface opposed to the handle shank. The radially spaced apart array of cutting teeth have stamped thereon a corresponding substantially parallel spaced apart array of longitudinal creases so as to form a corresponding substantially parallel spaced apart array of second concave surfaces on the radially spaced apart array of cutting teeth. The stamping forms one of the second concave surfaces per tooth.
One or more cutting teeth have substantially flat forward tips. The tips are flat in a plane parallel to a plane substantially containing the opposed pair of side edges of the first concave surface, whereby the cutting teeth have cutting edges which are twisted between the flat forward tips and the first concave surface so as to form curvilinear cutting edges for shearing through roots being cut.
Advantageously, each cutting tooth may have an opposed pair of diverging twisted or curvilinear cutting edges extending from the flat forward tip to a point of intersection of the cutting edges with the first concave surface.
21271~28 Brief Description of the Drawings Figure 1 is a plan view of a root cutting shovel blade of the present invention.
Figure 2 is a perspective bottom view of the shovel blade of Figure 1.
Figure 3 is a partial side elevation view of the cutting teeth of the shovel blade of Figure 1.
Detailed Description of the Preferred Embodiment Figures 1 and 2 depict a shovel blade having root cutting teeth of the present invention. In particular, shovel blade 10, having shank 12, concave shovel surface 14, has cutting teeth 16. Cutting teeth 16 may be a radially spaced apart array of "V"-shaped cutting teeth around the forward, that is the soil engaging end, of shovel blade 10.
Cutting teeth 16 have formed thereon longitudinal concave creases 18 formed by stamping or like manufacturing method.
Longitudinal concave creases 18 strengthen teeth 16.
By the stamping process by which longitudinal concave creases 18 are formed on teeth 16, cutting edges 20 of teeth 16 are deformed into a twisted curvilinear shape. It has been found that between the forward apex of cutting teeth 16 and the forward end of longitudinal concave creases 18 that the stamping process forms flat tips 22 on the forward ends of cutting teeth 16.
A stamping process which is substantially vertical applied to shovel blade 10 deforms forward tips 22 out of conformal concavity with the concavity of concave surface 14, typically resulting in forward tips 22 being deformed into an orientation substantially parallel with a plane containing concave surface 14 were concave surface 14 flat. Thus what is formed along cutting edges 20 is a curved or twisted cutting edge between forward tips 22 and the intersection of cutting edges between individual cutting teeth 16.
As will be apparent to those skilled in the art in the light of the foregoing disclosure, many alterations and modifica-tions are possible in the practice of this invention without departing from the spirit or scope thereof. Accordingly, the scope of the invention is to be construed in accordance with the substance defined by the following claims.
25Each of the prior art instruments above described cut roots by the action of forcing the shovel blade against the roots in a direction substantially parallel to the longitudinal axis of the shovel handle so as to thereby cut through roots caught between the teeth or tines. The roots are brought against a 30sharpened edge of the shovel blade between the teeth or tines and thereby cut merely by the thrusting force acting on the shovel.
It has been found that the root cutting ability of a shovel blade having teeth or tines extending forward from the 35soil engaging end of the shovel blade or formed therein so as to leave "V" shaped notches between the teeth or tines, may be improved by a shovel blade according to the present invention.
Consequently it is an object of the present invention to provide a shovel blade having teeth extending forward from, or formed in, the soil engaging end of the shovel blade wherein the teeth cutting edges which are twisted longitudinally to provide a shearing cutting action as the twisted cutting edges are forced into cutting engagement with roots.
SummarY of the Invention A root cutting shovel blade has a first concave surface extending between a longitudinally aligned handle shank and a radially spaced apart array of cutting teeth, the cutting teeth spaced apart around a curved edge of the first concave surface opposed to the handle shank. An opposed pair of side edges extends around the first concave surface between the handle shank and the curved edge of the first concave surface opposed to the handle shank. The radially spaced apart array of cutting teeth have stamped thereon a corresponding substantially parallel spaced apart array of longitudinal creases so as to form a corresponding substantially parallel spaced apart array of second concave surfaces on the radially spaced apart array of cutting teeth. The stamping forms one of the second concave surfaces per tooth.
One or more cutting teeth have substantially flat forward tips. The tips are flat in a plane parallel to a plane substantially containing the opposed pair of side edges of the first concave surface, whereby the cutting teeth have cutting edges which are twisted between the flat forward tips and the first concave surface so as to form curvilinear cutting edges for shearing through roots being cut.
Advantageously, each cutting tooth may have an opposed pair of diverging twisted or curvilinear cutting edges extending from the flat forward tip to a point of intersection of the cutting edges with the first concave surface.
21271~28 Brief Description of the Drawings Figure 1 is a plan view of a root cutting shovel blade of the present invention.
Figure 2 is a perspective bottom view of the shovel blade of Figure 1.
Figure 3 is a partial side elevation view of the cutting teeth of the shovel blade of Figure 1.
Detailed Description of the Preferred Embodiment Figures 1 and 2 depict a shovel blade having root cutting teeth of the present invention. In particular, shovel blade 10, having shank 12, concave shovel surface 14, has cutting teeth 16. Cutting teeth 16 may be a radially spaced apart array of "V"-shaped cutting teeth around the forward, that is the soil engaging end, of shovel blade 10.
Cutting teeth 16 have formed thereon longitudinal concave creases 18 formed by stamping or like manufacturing method.
Longitudinal concave creases 18 strengthen teeth 16.
By the stamping process by which longitudinal concave creases 18 are formed on teeth 16, cutting edges 20 of teeth 16 are deformed into a twisted curvilinear shape. It has been found that between the forward apex of cutting teeth 16 and the forward end of longitudinal concave creases 18 that the stamping process forms flat tips 22 on the forward ends of cutting teeth 16.
A stamping process which is substantially vertical applied to shovel blade 10 deforms forward tips 22 out of conformal concavity with the concavity of concave surface 14, typically resulting in forward tips 22 being deformed into an orientation substantially parallel with a plane containing concave surface 14 were concave surface 14 flat. Thus what is formed along cutting edges 20 is a curved or twisted cutting edge between forward tips 22 and the intersection of cutting edges between individual cutting teeth 16.
As will be apparent to those skilled in the art in the light of the foregoing disclosure, many alterations and modifica-tions are possible in the practice of this invention without departing from the spirit or scope thereof. Accordingly, the scope of the invention is to be construed in accordance with the substance defined by the following claims.
Claims (5)
1. A root cutting shovel blade comprises:
a shovel blade having a first concave surface extending between a longitudinally aligned handle shank and a radially spaced apart array of cutting teeth, said radially spaced apart array of cutting teeth spaced apart around a curved edge of said first concave surface opposed to said handle shank, an opposed pair of side edges extending around said first concave surface between said handle shank and said curved edge of said first concave surface opposed to said handle shank, said radially spaced apart array of cutting teeth having stamped thereon a corresponding spaced apart array of longitudinal creases so as to form a corresponding spaced apart array of second concave surfaces on said radially spaced apart array of cutting teeth, one of said second concave surfaces per tooth of said array of cutting teeth, said cutting teeth of said radially spaced apart array of cutting teeth having curvilinear cutting edges.
a shovel blade having a first concave surface extending between a longitudinally aligned handle shank and a radially spaced apart array of cutting teeth, said radially spaced apart array of cutting teeth spaced apart around a curved edge of said first concave surface opposed to said handle shank, an opposed pair of side edges extending around said first concave surface between said handle shank and said curved edge of said first concave surface opposed to said handle shank, said radially spaced apart array of cutting teeth having stamped thereon a corresponding spaced apart array of longitudinal creases so as to form a corresponding spaced apart array of second concave surfaces on said radially spaced apart array of cutting teeth, one of said second concave surfaces per tooth of said array of cutting teeth, said cutting teeth of said radially spaced apart array of cutting teeth having curvilinear cutting edges.
2. The device of Claim 1 wherein said cutting teeth of said array of cutting teeth have substantially flat tips lying in a plane parallel to a plane substantially containing said opposed pair of side edges, whereby said at cutting edges are curvilinear between said flat tip and said first concave surface.
3. The device of claim 2 wherein said at least one cutting tooth comprises opposed diverging curvilinear cutting edges extending from said flat tip to a point of intersection of said curvilinear cutting edges with said first concave surface, said opposed diverging curvilinear cutting edges extending along either side of said second concave surface on said at least one cutting tooth.
4. The device of claim 3 wherein said array of cutting teeth comprises at least one opposed pair of cutting teeth having said opposed diverging curvilinear cutting edges, opposed equidistant from a longitudinal axis longitudinally bisecting said first concave surface, said handle shank and said array of cutting teeth.
5. A method of making a root cutting shovel blade having a first concave surface extending between a longitudinally aligned handle shank and a radially spaced apart array of cutting teeth, wherein said radially spaced apart array of cutting teeth is spaced apart around a curved edge of said first concave surface opposed to said handle shank, an opposed pair of side edges extending around said first concave surface between said handle shank and said curved edge of said first concave surface opposed to said handle shank, comprises the step of stamping on said radially spaced apart array of cutting teeth a corresponding substantially parallel spaced apart array of longitudinal creases so as to form a corresponding substantially parallel spaced apart array of second concave surfaces on said radially spaced apart array of cutting teeth, one of said second concave surfaces per tooth of said array of cutting teeth, whereby at least one cutting tooth of said array of cutting teeth has a substantially flat tip lying in a plane parallel to a plane substantially containing said opposed pair of side edges, so as to form a cutting edge along said at least one cutting tooth which is curvilinear between said flat tip and said first concave surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002127028A CA2127028A1 (en) | 1994-06-29 | 1994-06-29 | Root cutting shovel blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002127028A CA2127028A1 (en) | 1994-06-29 | 1994-06-29 | Root cutting shovel blade |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2127028A1 true CA2127028A1 (en) | 1995-12-30 |
Family
ID=4153914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002127028A Abandoned CA2127028A1 (en) | 1994-06-29 | 1994-06-29 | Root cutting shovel blade |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2127028A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USD952422S1 (en) * | 2020-09-17 | 2022-05-24 | Changzhi Fu | Shovel head |
-
1994
- 1994-06-29 CA CA002127028A patent/CA2127028A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USD952422S1 (en) * | 2020-09-17 | 2022-05-24 | Changzhi Fu | Shovel head |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |