Patent US3918534A successfully refreshed from Google Patents.
US3918534A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Special clutch for vibration isolated chain saws
Assignee: FOGELHOLM CARL MAGNUS
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Filing: 1974-04-25
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Granted: 1975-11-11
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Expires: 1994-04-25
Abstract
Abstract A special clutch for chain saws in which the motor is mounted on vibration isolators and the clutch axle on which the chain wheel is mounted is driven from the crankshaft by both a centrifugal clutch and a spring clutch.
Inventors
- 👤 Carl-Magnus Fogelholm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:03
CPC Classifications
B; B27; B27B; B27B17/00; B27B17/08; B27B17/10; F; F16; F16D; F16D43/00; F16D43/02; F16D43/04; F16D43/14; F16D43/18
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
193 words
In a portable chain saw, a body, a motor resiliently supported in said body and including a drive shaft, a guide bar secured to said body, an axle supported in said body generally in alignment with said drive shaft and having an end in spaced relationship to an end of said drive shaft but subject to some misalignment, a chain wheel supported for rotation about the axis of said axle, and a centrifugal clutch comprising an inner portion mounted on said drive shaft for rotation thereby and radially expandable with increased speed of rotation, a drum portion rotatably supported from said axle in driving relation to said chain wheel and including a peripheral portion radially spaced from said first clutch portion to be drivingly engaged by said inner portion, and resilient means secured to one of said clutch portions in substantially the same radial plane as said inner portion and said peripheral portion of said drum portion to provide such resiliency in the connection of said centrifugal clutch portions during driving engagement therebetween as to result in the engagement being substantially continuous despite occurrence of misalignment between said drive shaft and said axle.
Claim 2
Dependent Claim
193 words
In a portable chain saw, a body, a motor resiliently supported in said body and including a drive shaft, a guide bar secured to said body, an axle supported in said body generally in alignment with said drive shaft and having an end in spaced relationship to an end of said drive shaft but subject to some misalignment, a chain wheel supported for rotation about the axis of said axle, and a centrifugal clutch comprising an inner portion mounted on said drive shaft for rotation thereby and radially expandable with increased speed of rotation, a drum portion rotatably supported from said axle in driving relation to said chain wheel and including a peripheral portion radially spaced from said first clutch portion to be drivingly engaged by said inner portion, and resilient means secured to one of said clutch portions in substantially the same radial plane as said inner portion and said peripheral portion of said drum portion to provide such resiliency in the connection of said centrifugal clutch portions during driving engagement therebetween as to result in the engagement being substantially continuous despite occurrence of misalignment between said drive shaft and said axle.
Claim 3
Dependent Claim
23 words
A portable chain saw as recited in claim 1, wherein said resilient means is secured to said drum portion of said centrifugal clutch.
Claim 4
Dependent Claim
68 words
A portable chain saw as recited in claim 1, wherein said drum portion of said centrifugal clutch includes a portion on one side of its said peripheral portion rotatably supported on said axle and a portion on the opposite side of its said peripheral portion secured to said chain wheel to support said chain wheel in a position substantially concentric with but spaced radially from said drive shaft.
Claim 5
Dependent Claim
178 words
In a portable chain saw, a body, a motor resiliently supported in said body and including a drive shaft, a guide bar secured to said body, an axle supported in said body generally in alignment with said drive shaft and having an end in spaced relation to an end of said shaft, and power transmitting means comprising an inner centrifugal clutch portion secured to said drive shaft for rotation therewith and radially expandable with increased speed of rotation, a clutch drum portion rotatably supported from said axle and including a peripheral portion spaced radially about said inner clutch portion, chain wheel means rotatable with said clutch drum portion, an intermediate means including at least a peripheral member of smaller diameter than said peripheral portion of said clutch drum portion, and means resiliently securing said peripheral member of said intermediate means to said peripheral member of said drum portion between it and said inner clutch portion, whereby said inner clutch portion will drivingly engage said peripheral member upon reaching a predetermined speed to resiliently drive said clutch drum portion.
Claim 6
Dependent Claim
178 words
In a portable chain saw, a body, a motor resiliently supported in said body and including a drive shaft, a guide bar secured to said body, an axle supported in said body generally in alignment with said drive shaft and having an end in spaced relation to an end of said shaft, and power transmitting means comprising an inner centrifugal clutch portion secured to said drive shaft for rotation therewith and radially expandable with increased speed of rotation, a clutch drum portion rotatably supported from said axle and including a peripheral portion spaced radially about said inner clutch portion, chain wheel means rotatable with said clutch drum portion, an intermediate means including at least a peripheral member of smaller diameter than said peripheral portion of said clutch drum portion, and means resiliently securing said peripheral member of said intermediate means to said peripheral member of said drum portion between it and said inner clutch portion, whereby said inner clutch portion will drivingly engage said peripheral member upon reaching a predetermined speed to resiliently drive said clutch drum portion.
Claim 7
Dependent Claim
30 words
A portable chain saw as defined in claim 4, wherein said intermediate means comprises a portion supported free for rotation on said drive shaft for supporting its said peripheral member.
Claim 8
Dependent Claim
166 words
In a portable chain saw, a body, a motor resiliently supported in said body and including a drive shaft, guide bar secured To said body, an axle supported in said body generally in alignment with said drive shaft and having an end in spaced relation to an end of said drive shaft, a chain wheel rotatably supported on said axle, and a centrifugal clutch comprising an inner clutch portion secured to said drive shaft for rotation therewith and radially expandable with increased speed of rotation, a first drum portion supported free for rotation on said drive shaft and having a peripheral portion adapted for engagement by said inner clutch portion upon its attaining a predetermined speed, a second drum portion secured in driving relation to said chain wheel and including a peripheral portion spaced radially from and outside of the peripheral portion of said first drum portion, and resilient means disposed between the peripheral portions of said drum portions to provide a resilient drive connection therebetween.
Claim 9
Dependent Claim
166 words
In a portable chain saw, a body, a motor resiliently supported in said body and including a drive shaft, guide bar secured To said body, an axle supported in said body generally in alignment with said drive shaft and having an end in spaced relation to an end of said drive shaft, a chain wheel rotatably supported on said axle, and a centrifugal clutch comprising an inner clutch portion secured to said drive shaft for rotation therewith and radially expandable with increased speed of rotation, a first drum portion supported free for rotation on said drive shaft and having a peripheral portion adapted for engagement by said inner clutch portion upon its attaining a predetermined speed, a second drum portion secured in driving relation to said chain wheel and including a peripheral portion spaced radially from and outside of the peripheral portion of said first drum portion, and resilient means disposed between the peripheral portions of said drum portions to provide a resilient drive connection therebetween.
Claim 10
Dependent Claim
29 words
A portable chain saw as defined in claim 6, wherein a chain brake is supported on said body for operatively engaging said second drum portion upon occurrence of kick-back.
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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) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |