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US3656554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lawn edge trimmer blade
Assignee: Individual
•
Filing: 1970-03-10
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Granted: 1972-04-18
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Expires: 1990-03-10
Abstract
Abstract A lawn edge trimmer having a cutting blade mounted on an arbor connected with the drive shaft of the machine. The blade is provided with a hub portion mounted on the arbor or drive shaft and has opposite end portions curved outward relative to the axis of rotation thereof to create a desireable contour shape at the edge of a lawn or around a sprinkler head, etc.
Inventors
- 👤 William A Buhner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:54
CPC Classifications
A; A01; A01G; A01G3/00; A01G3/06; A01G3/062; A01D; A01D34/00; A01D34/835; A01D34/84
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
108 words
In a lawn edger having a power shaft rotatable about an axis, and a cutting tool mounted on the shaft for rotation therewith about said axis, said cutting tool comprising a hub portion in a plane normal to the axis and with blade portions on the periphery of the hub portion with each blade portion extending generally axially outwardly from the periphery of the hub portion in a smooth curve which begins adjacent the hub portion and extends along the length of the blade portiOn substantially to a radially extending outer end thereof, said blade portions having longitudinal edges thereof sharpened to cut grass on a contoured edge.
Claim 2
Dependent Claim
108 words
In a lawn edger having a power shaft rotatable about an axis, and a cutting tool mounted on the shaft for rotation therewith about said axis, said cutting tool comprising a hub portion in a plane normal to the axis and with blade portions on the periphery of the hub portion with each blade portion extending generally axially outwardly from the periphery of the hub portion in a smooth curve which begins adjacent the hub portion and extends along the length of the blade portiOn substantially to a radially extending outer end thereof, said blade portions having longitudinal edges thereof sharpened to cut grass on a contoured edge.
Claim 3
Dependent Claim
36 words
In a lawn edger according to claim 1, wherein the blade portion extends approximately parallel with axis from the hub portion and curved outwardly from said parallel portion through approximately 90* with respect to said axis.
Claim 4
Dependent Claim
27 words
In a lawn edger according to claim 1, wherein the cutting tool blade portions at the periphery of the hub portion each is curved through approximately 90*.
Claim 5
Dependent Claim
42 words
In a lawn edger according to claim 3, wherein each blade portion at one end extends approximately tangent to a plane parallel with the axis and at the opposite end extends approximately tangent to a plane at right angles to the axis.
Claim 6
Dependent Claim
21 words
In a lawn edger according to claim 3, wherein the curve of each blade portion is a quadrant of an ellipse.
Claim 7
Dependent Claim
148 words
In a lawn edger having a power operated drive shaft with a projecting end and rotatable about an axis, an arbor mounted at one end on the drive shaft and extending outwardly therefrom, and a cutting tool mounted on the opposite end of said arbor, said cutting tool comprising an elongated hub portion in a plane normal to the axis and with blade portions on the opposite ends of the hub portion with each blade portion extending generally axially outwardly from said end of the hub portion in a smooth curve which begins normal to the end of the hub portion and extends axially and radially outward from the axis substantially to the outer end of the blade portion which is substantially parallel with the hub portion, said blade portions having longitudinal edges thereof sharpened to operate about the axis in cutting a curved edge to the grass.
Claim 8
Dependent Claim
148 words
In a lawn edger having a power operated drive shaft with a projecting end and rotatable about an axis, an arbor mounted at one end on the drive shaft and extending outwardly therefrom, and a cutting tool mounted on the opposite end of said arbor, said cutting tool comprising an elongated hub portion in a plane normal to the axis and with blade portions on the opposite ends of the hub portion with each blade portion extending generally axially outwardly from said end of the hub portion in a smooth curve which begins normal to the end of the hub portion and extends axially and radially outward from the axis substantially to the outer end of the blade portion which is substantially parallel with the hub portion, said blade portions having longitudinal edges thereof sharpened to operate about the axis in cutting a curved edge to the grass.
Claim 9
Dependent Claim
19 words
In a lawn edger according to claim 6, wherein the curve of the blade portions extends through approximately 90*.
Claim 10
Dependent Claim
21 words
In a lawn edger according to claim 6, wherein the curve of each blade portion is a quadrant of an ellipse.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |