Patent US3726070A successfully refreshed from Google Patents.
US3726070A
Expired / Lapsed
US
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Staggered blade mower
Assignee: TORO Manufacturing CORP
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Filing: 1969-08-11
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Granted: 1973-04-10
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Expires: 1989-08-11
Abstract
Abstract A reel for a reel type mower having unequally spaced blades, in which the distance or angle between each pair of adjacent blades is different from the distance or angle between every other pair of adjacent blades on the reel.
Inventors
- 👤 A Klosterman
- 👤 D Klemenhagen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:29
CPC Classifications
A; A01; A01D; A01D34/00; A01D34/01; A01D34/412; A01D34/42; A01D34/52; A01D34/53
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
162 words
A reel mower comprising a bed knife and a rotatable cutting reel having at least three spiral cutting blades secured about a common axis and positioned to define a cutting edge for each said blade along the circumference of said reel To engage said bed knife for cutting grass therebetween, said spiral blades comprising a first blade located between a second blade and a third blade, said second blade located substantially parallel to said first blade along their coaxial length and located to define a first circumferential distance between said first and second blade, and said third blade located substantially parallel to said first blade along their coaxial length and located to define a second circumferential distance between said first and third blade, which second distance is different from said first distance to result in different time periods between said three blades engaging said bed knife and thus change the excitation frequency of said bed knife as caused by said three blades.
Claim 2
Dependent Claim
162 words
A reel mower comprising a bed knife and a rotatable cutting reel having at least three spiral cutting blades secured about a common axis and positioned to define a cutting edge for each said blade along the circumference of said reel To engage said bed knife for cutting grass therebetween, said spiral blades comprising a first blade located between a second blade and a third blade, said second blade located substantially parallel to said first blade along their coaxial length and located to define a first circumferential distance between said first and second blade, and said third blade located substantially parallel to said first blade along their coaxial length and located to define a second circumferential distance between said first and third blade, which second distance is different from said first distance to result in different time periods between said three blades engaging said bed knife and thus change the excitation frequency of said bed knife as caused by said three blades.
Claim 3
Dependent Claim
35 words
A reel mower of claim 1 wherein said reel includes more than three spiral parallel cutting blades and said blades are located wherein the circumferential distances between adjacent said blades are dissimilar from one another.
Claim 4
Dependent Claim
29 words
A reel mower of claim 2 wherein said circumferential distances between adjacent said blades does not progressively increase between successive adjacent blades in either circumferential direction about said reel.
Claim 5
Dependent Claim
15 words
A reel mower of claim 3, wherein said reel comprises an odd number of blades.
Claim 6
Dependent Claim
36 words
A reel mower of claim 4, wherein the difference in angular displacement between one pair of adjacent blades and any other pair of adjacent blades the reel is substantially in the range of 1 to 9*.
Claim 7
Dependent Claim
22 words
A reel mower of claim 4, wherein said circumferential distances vary from one another in the range of 0.018 to 0.170 inches.
Claim 8
Dependent Claim
22 words
A reel mower of claim 2, wherein said circumferential distances vary from one another in the range of 0.19 to 0.30 inches.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |