Patent FR902023A successfully refreshed from Google Patents.
Patent US3683606A successfully refreshed from Google Patents.
US3683606A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blade assembly for rotary lawn mower
Assignee: Individual
•
Filing: 1970-11-12
•
Granted: 1972-08-15
•
Expires: 1990-11-12
Abstract
Abstract An arm and blade assembly for a rotary lawn mower is provided comprising an arm member defining a pair of arms, and a pair of blades, one affixed at the end of each arm, the blades being affixed to the arms by means of a keystone or dovetail joint providing restriction with respect to longitudinal and lateral movement, and a sleeve disposed over the joint providing restriction with regard to vertical movement, thereby providing a safe and positive means for readily affixing and detaching the blades to and from the arms.
Inventors
- 👤 Harvey C Staines
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:05
CPC Classifications
A; A01; A01D; A01D34/00; A01D34/01; A01D34/412; A01D34/63; A01D34/73; A01D34/733
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
133 words
An arm and blade subassembly for a rotary-type lawn mower, comprising an arm member adapted to be mounted on a shaft, a detachable blade having at least one cutting edge, and means for affixing said blade to the end of said arm comprising a tongue extending longitudinally as an integral part of one member of said blade and said arm end and a complementary slot provided in the other of said members, said tongue and slot being shaped to prevent relative longitudinal movement between said arm end and said blade, and a sleeve slidably mounted on said arm and adapted to be placed over said tongue and slot to confine said tongue within said slot, wherein longitudinal ribs are provided on the surface of said tongue to prevent corrosive adhesion to said sleeve.
Claim 2
Dependent Claim
133 words
An arm and blade subassembly for a rotary-type lawn mower, comprising an arm member adapted to be mounted on a shaft, a detachable blade having at least one cutting edge, and means for affixing said blade to the end of said arm comprising a tongue extending longitudinally as an integral part of one member of said blade and said arm end and a complementary slot provided in the other of said members, said tongue and slot being shaped to prevent relative longitudinal movement between said arm end and said blade, and a sleeve slidably mounted on said arm and adapted to be placed over said tongue and slot to confine said tongue within said slot, wherein longitudinal ribs are provided on the surface of said tongue to prevent corrosive adhesion to said sleeve.
Claim 3
Dependent Claim
27 words
An arm and blade subassembly according to claim 1, wherein said tongue comprises an extension of said blade and said slot is provided in said arm end.
Claim 4
Dependent Claim
27 words
An arm and blade subassembly according to claim 1, wherein said tongue comprises an extension of said arm end and said slot is provided in said blade.
Claim 5
Dependent Claim
16 words
An arm and blade subassembly according to claim 1, wherein said tongue has a dovetail shape.
Claim 6
Dependent Claim
16 words
An arm and blade subassembly according to claim 1, wherein said tongue is curvilinear in shape.
Claim 7
Dependent Claim
34 words
An arm and blade subassembly according to claim 1, wherein said blade has two cutting edges and is adapted to be reversed for alternatively presenting each cutting edge in the forward direction of rotation.
Claim 8
Dependent Claim
24 words
An arm and blade subassembly according to claim 1, wherein the surfaces of said arm are treated to prevent corrosive adhesion to said sleeve.
Claim 9
Dependent Claim
14 words
An arm and blade subassembly according to claim 7, wherein said treatment is anodizing.
Claim 10
Dependent Claim
131 words
A detachable blade having at least one cutting edge and adapted to be mounted at the end of a rotatable arm of a rotary lawn mower, and means for affixing said blade to the end of said arm comprising a tongue extending as an integral part of one member of said blade and said arm end, and a complementary slot provided at the end of the other member, said tongue and slot being shaped to prevent relative longitudinal movement between said arm end and said blade, a sleeve slidably mounted on said arm and adapted to be placed over said tongue when engaged in said slot, thereby confining said tongue within said slot, wherein said tongue is provided with longitudinal ribs to prevent corrosive adhesion of said tongue to said sleeve.
Claim 11
Dependent Claim
131 words
A detachable blade having at least one cutting edge and adapted to be mounted at the end of a rotatable arm of a rotary lawn mower, and means for affixing said blade to the end of said arm comprising a tongue extending as an integral part of one member of said blade and said arm end, and a complementary slot provided at the end of the other member, said tongue and slot being shaped to prevent relative longitudinal movement between said arm end and said blade, a sleeve slidably mounted on said arm and adapted to be placed over said tongue when engaged in said slot, thereby confining said tongue within said slot, wherein said tongue is provided with longitudinal ribs to prevent corrosive adhesion of said tongue to said sleeve.
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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |