US4062171A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cutter blade assembly
Assignee: Massey Ferguson Inc
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Filing: 1976-08-30
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Granted: 1977-12-13
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Expires: 1996-08-30
Abstract
Abstract Two blades of the cutter blade assembly are pivotally mounted separately by means of a coupler on opposite sides of a drive shaft and move to an extended position by centrifugal force. Upon one blade striking an inseverable object both blades are caused to move to a retracted position. In moving from the extended position to the retracted position the impacted blade coacts with the opposite blade to move the latter to a retracted position.
Inventors
- 👤 Jack Howard Rose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:38
CPC Classifications
A; A01; A01D; A01D34/00; A01D34/01; A01D34/412; A01D34/63; A01D34/73; A01D34/736
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
83 words
A lawn mower cutter blade assembly having a plurality of cutter blades movable between extended and retracted position, drive means including a shaft, means for pivotally mounting said blades on said drive means, and each blade pivoting about a separate axis radially outwardly from said shaft, the improvement comprising, means for coacting between said blades upon the striking of an unseverable object by one of said blades, and said coacting means being spaced radially outwardly of said means for pivotally mounting said blades.
Claim 2
Dependent Claim
83 words
A lawn mower cutter blade assembly having a plurality of cutter blades movable between extended and retracted position, drive means including a shaft, means for pivotally mounting said blades on said drive means, and each blade pivoting about a separate axis radially outwardly from said shaft, the improvement comprising, means for coacting between said blades upon the striking of an unseverable object by one of said blades, and said coacting means being spaced radially outwardly of said means for pivotally mounting said blades.
Claim 3
Dependent Claim
46 words
An assembly as set forth in claim 1 wherein said drive means including a shaft has a coupler attached to said shaft, whereby when said assembly is in its extended position said shaft is between said coacting means and said pivotal means of a respective blade.
Claim 4
Dependent Claim
16 words
An assembly as set forth in claim 2 wherein said coacting means is on each blade.
Claim 5
Dependent Claim
26 words
An assembly as set forth in claim 1 wherein said assembly is two cutter blades and said coupler is a single cross-piece pivotally connecting said blades.
Claim 6
Dependent Claim
35 words
An assembly as set forth in claim 1 wherein each blade has a cutting portion, a mounting portion and an end portion, and said mounting portion is between said cutting portion ans said end portion.
Claim 7
Dependent Claim
17 words
An assembly as set forth in claim 5 wherein said cutting portion has a uniform longitudinal dimension.
Claim 8
Dependent Claim
27 words
An assembly as set forth in claim 6 wherein said end portion includes a tip portion at an angle to the plane of said respective end portion.
Claim 9
Dependent Claim
22 words
An assembly as set forth in claim 7 wherein said tip portion is normal to the plane of said respective end portion.
Claim 10
Dependent Claim
24 words
An assembly as set forth in claim 8 wherein said cutting portion, said mounting portion and said end portion are in the same plane.
References Cited (Backward Citations)
US2939264A
Cited
US3158977A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-12 | 1981-06-13 | 1981-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-12 | 1985-06-13 | 1985-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-12 | 1989-06-13 | 1989-12-13 | $7700.00 | Window Closed / Lapsed |