US4254550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lawn trimmer
Assignee: Kioritz Corp
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Filing: 1979-08-16
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Granted: 1981-03-10
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Expires: 1999-08-16
Abstract
Abstract A lawn trimmer comprises a housing fixed to a rotating shaft and containing a spool therein and a stub shaft threadedly received in the rotating shaft. A support member is provided for holding the spool against the housing and fixedly secured to said stub shaft. A ground engaging disc is rotatably mounted on the stub shaft and connected to the support member by means of spring loaded centrifugal elements during stoppage of the trimmer. During rotation of the trimmer, the centrifugal elements function to free connection between the disc and the support member by being subjected to the centrifugal force.
Inventors
- 👤 Masatoshi Satoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:58
CPC Classifications
A; A01; A01D; A01D34/00; A01D34/01; A01D34/412; A01D34/416; A01D34/4161; A01D34/4167
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
167 words
A trimmer comprising a housing rigidly fixed to the end of a rotating shaft, a spool around which a cutting nylon cord element is wound and which is contained in said housing, said cord element having its free end portion extending radially outwardly through the wall of the housing, a stub shaft threadedly received in said rotating shaft at its lower end, a support member fixedly secured to said stub shaft for holding said spool against the housing, a ground engaging disc rotatably mounted on said stub shaft by means of a bearing, a bearing casing secured to the inner surface of said disc and having grooves formed therein, and a pair of opposed spring loaded centrifugal elements pivotally mounted on said support member and engaging said grooves for connection of said disc with said support member during stoppage of the trimmer, said centrifugal elements being moved radially outwardly of said bearing casing under the centrifugal force during rotation of the trimmer to disengage from the grooves.
Claim 2
Dependent Claim
167 words
A trimmer comprising a housing rigidly fixed to the end of a rotating shaft, a spool around which a cutting nylon cord element is wound and which is contained in said housing, said cord element having its free end portion extending radially outwardly through the wall of the housing, a stub shaft threadedly received in said rotating shaft at its lower end, a support member fixedly secured to said stub shaft for holding said spool against the housing, a ground engaging disc rotatably mounted on said stub shaft by means of a bearing, a bearing casing secured to the inner surface of said disc and having grooves formed therein, and a pair of opposed spring loaded centrifugal elements pivotally mounted on said support member and engaging said grooves for connection of said disc with said support member during stoppage of the trimmer, said centrifugal elements being moved radially outwardly of said bearing casing under the centrifugal force during rotation of the trimmer to disengage from the grooves.
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) | 1984-03-09 | 1984-09-08 | 1985-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-09 | 1988-09-08 | 1989-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-09 | 1992-09-08 | 1993-03-10 | $7700.00 | Window Closed / Lapsed |