US3581482A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Devices for fastening and protecting the cutters of rotary mowing machines
Assignee: Kuhn Freres and Cie
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Filing: 1968-11-22
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Granted: 1971-06-01
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Expires: 1988-11-22
Abstract
Abstract Device for fastening and protecting cutter elements of a rotary mowing machine which are mounted on the marginal portion of supporting discs secured to the main bar of the mowing machine, characterized in that each cutter element is secured by a suitable bolt provided with a self-locking nut protected by a device consisting of an integral collar and washer assembly adapted, when tightened, to permit the backward pivoting movement of the relevant cutter element when the latter engages a resistant obstacle, adequate members being provided for preventing the distortion of said cutter elements and protecting the disc fastening means.
Inventors
- 👤 Walter E Reber
- 👤 Adrien J Formery
- 👤 Wilhelm H M Van Den Heuvel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:28
CPC Classifications
A; A01; A01D; A01D34/00; A01D34/01; A01D34/412; A01D34/63; A01D34/64; A01D34/66; A01D34/664
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
143 words
A device for fastening and protecting cutter elements of a rotary mowing machine, having a main bar, rotating supporting discs secured to the main bar by means of a spindle journaled in a bearing fitted in a case secured to the upper portion of said bar, said discs having a tapered portion and a marginal flat annular flange parallel to said bar portion with a plurality of cutter elements secured to said flange beneath said disc, said device comprising pivot bolts securing said cutter elements to said flange and permitting pivoting movement of each cutter element on its bolt, an integral collar-and-washer assembly in said disc flange for each bolt, a self-locking nut on each bolt fitting entirely in the collar-shaped portion of said assembly, means for protecting said cutters against bending and means for protecting said disc spindle bearings against any ingress.
Claim 2
Independent Claim
143 words
A device for fastening and protecting cutter elements of a rotary mowing machine, having a main bar, rotating supporting discs secured to the main bar by means of a spindle journaled in a bearing fitted in a case secured to the upper portion of said bar, said discs having a tapered portion and a marginal flat annular flange parallel to said bar portion with a plurality of cutter elements secured to said flange beneath said disc, said device comprising pivot bolts securing said cutter elements to said flange and permitting pivoting movement of each cutter element on its bolt, an integral collar-and-washer assembly in said disc flange for each bolt, a self-locking nut on each bolt fitting entirely in the collar-shaped portion of said assembly, means for protecting said cutters against bending and means for protecting said disc spindle bearings against any ingress.
Claim 3
Dependent Claim
26 words
A device according to claim 1, wherein said flange of the supporting disc has bores receiving said collar-and-washer assembly, said assembly being welded to said flange.
Claim 4
Dependent Claim
18 words
A device according to claim 1, wherein said collar-and-washer assembly is an integral part of said supporting disc.
Claim 5
Dependent Claim
84 words
A device according to claim 1, wherein the lower face of said collar-and-washer assembly defines a cylindrical bore, a shoulder at the end of the bore and a flattened hole, and said bolt securing the cutter comprising a cylindrical portion permitting the pivotal movement of said cutter element and abutting against the shoulder of said assembly, and a flat portion engaging said flattened hole of the assembly, said cylindrical portion being centered by said bore and said flat portion locking the bolt against rotation.
Claim 6
Dependent Claim
40 words
A device according to claim 1, further comprising a reinforcing rib formed on said supporting disc and provided with stop members for stopping a backward movement of said pivoting cutter elements when they pivot beneath said flange of the disc.
Claim 7
Dependent Claim
22 words
A device according to claim 1, wherein said supporting disc has a reinforcing rib interrupted to provide passage for said cutter elements.
Claim 8
Dependent Claim
47 words
A device according to claim 1, wherein the means for protecting said disc spindle bearings comprises a tapered deflector integral with said case of the bearing and having its outer edge concentric to said spindle and leaving only a minimum gap between it and said supporting disc.
Claim 9
Dependent Claim
78 words
A device according to claim 1, wherein the means for protecting said cutters against bending comprises a wear member secured between two adjacent supporting diScs to said bar of the mowing machine so as to fit around the marginal portion of said bar, said wear member having a raised portion engaging the upper portion of said bar in order to straighten the cutters in case these have previously been bent downwards by their engagement with a resistant obstacle.
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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |