US3604189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Knife mounting on a rotary mower
Assignee: Unisys Corp
•
Filing: 1969-09-18
•
Granted: 1971-09-14
•
Expires: 1989-09-18
Abstract
Abstract A rotary mower has a plurality of supporting discs longitudinally spaced with cutting knives mounted adjacent to the periphery of the supporting disc. The individual knives have elongated slots fitting over elongated heads spaced from and securely fastened to the discs by cylindrical portions of an attaching bolt and interlock with the attaching bolt when the knives extend to radial cutting positions. Resiliently springs are attached to the supporting discs forwardly of the respective knives in the direction of rotation and have openings fitting over the elongated heads to hold the knife on the cylindrical portions of the attaching bolt as it pivots about the attaching bolt.
Inventors
- 👤 Delmar C Harer
- 👤 Charles B Adams
- 👤 Nigel W Meek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:58
CPC Classifications
A; A01; A01D; A01D34/00; A01D34/01; A01D34/412; A01D34/63; A01D34/64; A01D34/66; A01D34/664; A01D34/73; A01D34/733; A01D34/736
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
143 words
A mounting for a mower knife blade comprising a rotatable support, knife-blade-attaching means secured to said support and with a shank and an elongated head spacing said head from said support, said head having length and width extending longitudinally of said support with said length greater than said width, a slot in said knife blade for fitting said blade over said head and having a dimension less than the length of a said head, an elongated leaf spring mounted on said support and pressing against said blade for retaining said blade on said support when said slOt and head alignment is characterized by the longitudinal axis of said spring extending in the direction of rotation of said blade and attached to an area of said support located forwardly of said blade and attaching means relative to the direction of rotation of said blade.
Claim 2
Dependent Claim
143 words
A mounting for a mower knife blade comprising a rotatable support, knife-blade-attaching means secured to said support and with a shank and an elongated head spacing said head from said support, said head having length and width extending longitudinally of said support with said length greater than said width, a slot in said knife blade for fitting said blade over said head and having a dimension less than the length of a said head, an elongated leaf spring mounted on said support and pressing against said blade for retaining said blade on said support when said slOt and head alignment is characterized by the longitudinal axis of said spring extending in the direction of rotation of said blade and attached to an area of said support located forwardly of said blade and attaching means relative to the direction of rotation of said blade.
Claim 3
Dependent Claim
30 words
A mounting as set forth in claim 1 wherein said spring has an opening of substantially the same configuration as said head to fit over said head to engage blade.
Claim 4
Dependent Claim
54 words
A mounting as set forth in claim 1 wherein said spring has a circular opening with a diameter greater than the length of said head to fit over said head to engage said blade. 4 A mounting as set forth in claim 1 wherein said head has the length extending radially of the shank.
Claim 5
Dependent Claim
17 words
A mounting as set forth in claim 1 wherein said head has the length extending generally circumferentially.
Claim 6
Dependent Claim
29 words
A mounting as set forth in claim 1 wherein said support has a raised portion rotationally preceding said spring on the same side of said spring and attaching means.
Claim 7
Dependent Claim
26 words
A mounting as set forth in claim 1 wherein said spring is spaced from said support to pass said knife rotating on or about said shank.
Claim 8
Dependent Claim
46 words
A mounting as set forth in claim 1 wherein a strip is provided between said spring and said support and secured to said spring and support and having an opening fitting around said attaching means for maintaining the alignment of said spring with said attaching means.
Claim 9
Dependent Claim
24 words
A mounting as set forth in claim 6 wherein said raised portion has a sloped surface and said spring is secured to said surface.
Claim 10
Dependent Claim
26 words
A mounting as set forth in claim 1 wherein said support is disc shaped and said spring is curved to follow the contour of said support.
Claim 11
Dependent Claim
26 words
A mounting as set forth in claim 7 wherein said knife blade has a longitudinally extending slot permitting said knife blade to reverse the cutting position.
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) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |