US3662529A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Swinging blade arrangement for mower assembly
Assignee: Maschinenfabrik Fahr AG
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Filing: 1970-10-30
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Granted: 1972-05-16
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Expires: 1990-10-30
Abstract
Abstract A mower assembly of the type in which a cylindrical mower body is rotated about a vertical axis and has a downwardly and outwardly divergent frustoconical apron or plate. The plate is provided with leaf-spring mounts for the blades whereby relative movement of the blades and the support plate is permitted.
Inventors
- 👤 Josef Glunk
- 👤 Heinz Gnadler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:18
CPC Classifications
A; A01; A01D; A01D34/00; A01D34/01; A01D34/412; A01D34/63; A01D34/73; A01D34/733; A01D34/736
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
78 words
In a rotary mower, comprising in combination a mower body rotatable about a generally vertical axis; a plurality of blades mounted on said body for rotatable entrainment therewith, and retaining means mounting said blades on said body to permit freedom of movement in the vertical direction and swinging movement about respective axes transverse to the cutting direction and lying in vertical planes so as to permit the blades to swing to an inoperative position upon striking an obstruction.
Claim 2
Dependent Claim
78 words
In a rotary mower, comprising in combination a mower body rotatable about a generally vertical axis; a plurality of blades mounted on said body for rotatable entrainment therewith, and retaining means mounting said blades on said body to permit freedom of movement in the vertical direction and swinging movement about respective axes transverse to the cutting direction and lying in vertical planes so as to permit the blades to swing to an inoperative position upon striking an obstruction.
Claim 3
Dependent Claim
67 words
The rotary mower defined in claim 1 wherein said body comprises a downwardly and outwardly divergent frustoconical cutter blade support plate, said retaining means including a respective pin extending perpendicular to said plate and pivotally supporting a respective blade, and a member fixed to said pin and spaced from said plate by a distance equal to a multiple to the thickness of the blade for holding same.
Claim 4
Dependent Claim
26 words
The rotary mower defined in claim 2 wherein said member is a leaf spring fixed to said body and having a free end carrying said pin.
Claim 5
Dependent Claim
33 words
The rotary mower defined in claim 3 wherein said leaf spring is spaced from said plate at said pin by a distance equal to at least four times the thickness of said blade.
Claim 6
Dependent Claim
25 words
The rotary mower defined in claim 4 wherein said pin has a frustoconical head, said plate being formed with a frustoconical recess accommodating said head.
Claim 7
Dependent Claim
42 words
The rotary mower defined in claim 5 wherein said pin has a frustoconical portion converging in the direction of said plate and spaced from said head by a cylindrical portion having an axial length approximately equal to the thickness of said blade.
Claim 8
Dependent Claim
26 words
The rotary mower defined in claim 4 wherein said pin is cylindrical and is received at least in part in a bore formed in said plate.
Claim 9
Dependent Claim
26 words
The rotary mower defined in claim 7, further comprising stop means on said pin for restricting the depth of penetration of said pin into said bore.
Claim 10
Dependent Claim
31 words
The rotary mower defined in claim 7, further comprising stop means on said leaf spring spaced from said pin for limiting the depth of penetration of said pin into said bore.
Claim 11
Dependent Claim
24 words
The rotary mower defined in claim 7 wherein each of said blades has a center of gravity lying within the outline of said plate.
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |