Patent US4461138A successfully refreshed from Google Patents.
US4461138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hub for flexible cutting blades
Assignee: Individual
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Filing: 1982-12-17
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Granted: 1984-07-24
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Expires: 2002-12-17
Abstract
Abstract The subject invention is a lawn mower blade hub member adapted for interconnecting a plurality of flexible blades, all affixed and disposed in a radial fashion from the centrally disposed hub member, which hub member is then mounted for concentric rotation on the lawn mower engine drive shaft; and wherein each such blade mounted to the hub member is comprised of a flexible, non-rigid, material. The hub member is a circular, plate-like member which has a plurality of insert openings which are adapted to receive and securely hold the radially inner ends of the respective flexible blade members. Disposed laterally adjacent to and just radially outwardly of the respective insert openings are vertically extending bosses, which bosses are disposed between the respective insert openings, thereby forming between adjacent bosses a channel area to securely hold a portion of the radially inner end of the flexible blade member in a radially outwardly rigid position.
Inventors
- 👤 Robert E. Whitman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:45
CPC Classifications
A; A01; A01D; A01D34/00; A01D34/01; A01D34/412; A01D34/416; A01D34/4166
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
80 words
A hub for flexible grass cutting blade members for a power lawn mower comprising: (a) a circular plate member, with an upper surface and a lower surface, and a circular perimeter, said circular plate member having a plurality of slotted openings extending completely through the plate member from the lower surface to the upper surface, said slotted openings having an access exposure on the lower surface of said plate member and having two access openings in the upper surface thereof;
Claim 2
Dependent Claim
80 words
A hub for flexible grass cutting blade members for a power lawn mower comprising: (a) a circular plate member, with an upper surface and a lower surface, and a circular perimeter, said circular plate member having a plurality of slotted openings extending completely through the plate member from the lower surface to the upper surface, said slotted openings having an access exposure on the lower surface of said plate member and having two access openings in the upper surface thereof;
Claim 3
Dependent Claim
178 words
(b) ring means having an upper surface and a lower surface integrally disposed on the upper surface of the plate member overlapping at least one of a portion of each said slotted openings; whereby each said slotted opening has two exposed accesses from the upper surface, and an opening to the lower surface; (c) a plurality of raised boss members disposed over the upper surface of said plate member, whereby said boss members are disposed in succession intermediate the respective areas of the upper surface of said plate members which are just radially outwardly of the respective slotted members, and wherein said upper surface of said boss members is in the same plane as the upper surface as said ring members; (d) a radially outer ledge on the upper surface of said hub member to receive a portion of the blade, said ledge being disposed between adjacent bosses; (e) a circular abutment means located radially on the upper surface of said plate member inwardly of the slotted openings to keep the cutting blade members from moving radially inwardly.
Claim 4
Dependent Claim
178 words
(b) ring means having an upper surface and a lower surface integrally disposed on the upper surface of the plate member overlapping at least one of a portion of each said slotted openings; whereby each said slotted opening has two exposed accesses from the upper surface, and an opening to the lower surface; (c) a plurality of raised boss members disposed over the upper surface of said plate member, whereby said boss members are disposed in succession intermediate the respective areas of the upper surface of said plate members which are just radially outwardly of the respective slotted members, and wherein said upper surface of said boss members is in the same plane as the upper surface as said ring members; (d) a radially outer ledge on the upper surface of said hub member to receive a portion of the blade, said ledge being disposed between adjacent bosses; (e) a circular abutment means located radially on the upper surface of said plate member inwardly of the slotted openings to keep the cutting blade members from moving radially inwardly.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-24 | 1988-01-23 | 1988-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-24 | 1992-01-23 | 1992-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-24 | 1996-01-23 | 1996-07-24 | $7700.00 | Window Closed / Lapsed |