Patent US3610382A successfully refreshed from Google Patents.
US3610382A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal clutch
Assignee: Campbell Hausfeld LLC
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Filing: 1969-10-27
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Granted: 1971-10-05
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Expires: 1989-10-27
Abstract
Abstract A centrifugal clutch particularly for a chain saw is provided. The clutch is made of two sintered centrifugal elements normally urged together by coil springs which are under compression when in a static condition and are further compressed as the clutch elements move outwardly under centrifugal force. By functioning in compression, the springs last longer and the engagement of the clutch is smoother.
Inventors
- 👤 Clifford Makinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:28
CPC Classifications
F; F16; F16D; F16D43/00; F16D43/02; F16D43/04; F16D43/14; F16D43/18
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
112 words
A centrifugal clutch comprising hub means engageable with a drive shaft, two generally U-shaped clutch shoe elements, each including clutch shoes with arcuate outer surfaces and two spaced, depending legs, each of said legs of one of said elements being positioned beside one of said legs of the other of said elements, two compression springs, each of said legs having an elongate opening therein aligned with an opening in the adjacent leg, with the adjacent openings defining spaces in which said compression springs are located, end portions of said legs being engaged with end portions of said springs to compress said springs when said clutch elements move outwardly away from one another.
Claim 2
Dependent Claim
112 words
A centrifugal clutch comprising hub means engageable with a drive shaft, two generally U-shaped clutch shoe elements, each including clutch shoes with arcuate outer surfaces and two spaced, depending legs, each of said legs of one of said elements being positioned beside one of said legs of the other of said elements, two compression springs, each of said legs having an elongate opening therein aligned with an opening in the adjacent leg, with the adjacent openings defining spaces in which said compression springs are located, end portions of said legs being engaged with end portions of said springs to compress said springs when said clutch elements move outwardly away from one another.
Claim 3
Dependent Claim
45 words
A centrifugal clutch according to claim 1 characterized by said legs having flanges at the ends of said openings engageable with the ends of said springs, said flanges being the end portions of said legs which are engaged with the end portions of said springs.
Claim 4
Dependent Claim
16 words
A centrifugal clutch according to claim 1 characterized by said clutch shoe elements being substantially identical.
Claim 5
Dependent Claim
97 words
A centrifugal clutch comprising two generally U-shaped clutch shoe elements, each of said shoe elements having two spaced, depending legs, each of said legs of one of said elements being positioned beside one of said legs of the other said elements, with the adjacent legs being substantially identical to one another, an end portion of each of said legs having a flange extending toward the adjacent leg, two compression springs, said flanges of said legs being engaged with end portions of said springs to compress said springs when said clutch elements move outwardly away from one another.
Claim 6
Dependent Claim
97 words
A centrifugal clutch comprising two generally U-shaped clutch shoe elements, each of said shoe elements having two spaced, depending legs, each of said legs of one of said elements being positioned beside one of said legs of the other said elements, with the adjacent legs being substantially identical to one another, an end portion of each of said legs having a flange extending toward the adjacent leg, two compression springs, said flanges of said legs being engaged with end portions of said springs to compress said springs when said clutch elements move outwardly away from one another.
Claim 7
Dependent Claim
39 words
A centrifugal clutch according to claim 4 characterized by each of said legs having an elongate opening therein aligned with an opening in the adjacent leg, with the adjacent openings defining spaces in which said compression springs are located.
Claim 8
Dependent Claim
22 words
A centrifugal clutch according to claim 5 characterized by said flanges of said legs being located at ends of said elongate openings.
Claim 9
Dependent Claim
36 words
A centrifugal clutch according to claim 4 characterized further by said legs of each of said shoe elements being substantially identical to each other, with the flanges at the end portions thereof facing in opposite directions.
Claim 10
Dependent Claim
65 words
A centrifugal clutch according to claim 4 characterized by hub means for engaging a drive shaft, said clutch shoe elements being mounted on said hub means and movable inwardly and outwardly with respect to said hub means, said hub means and said clutch shoe elements having cooperating edge and groove means for guiding said elements in their inward and outward movements relative to one another.
Claim 11
Dependent Claim
27 words
A centrifugal clutch according to claim 8 characterized by said clutch shoe elements and said hub means having cooperating notches and tangs to provide mechanical engagement therebetween.
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) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |