Patent US3937306A successfully refreshed from Google Patents.
US3937306A
Expired / Lapsed
US
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Automatic brake actuator for a chain saw
Assignee: Husqvarna AB
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Filing: 1974-08-27
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Granted: 1976-02-10
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Expires: 1994-08-27
Abstract
Abstract A device for automatically actuating a band brake on a motor saw for emergency stopping of the saw chain, wherein a latching mechanism including pretensioned elastic force-providing coupling is released, occurring upon a throw movement of the saw, by a pin or the like transferring a force between a carrying handle of the saw and a collapsable arm of the mechanism.
Inventors
- 👤 Ulf Vilheim Naslund
- 👤 Egil Skog
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:28
CPC Classifications
B; B27; B27B; B27B17/00; B27B17/08; B27B17/083
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
141 words
A motor saw of the kind having a driven drum; a band brake around the drum; a pre-tensioned elastic means for supplying a tensioning force to the band; a resilient, fixed carrying handle insulated by elastic elements against vibration; a collapsible arm pivotably connected to a part of the saw which is not insulated against vibrations and arranged adjacent said handle; a latching mechanism actuatable by said collapsible arm which, when released by actuation of the collapsible arm, is arranged to release the brake so that the said band is brought into operation by means of said pre-tensioned elastic means, the improvement which comprises a projection means extending between the carrying handle and the collapsible arm for transmitting a force occurring upon a throw movement of the saw to release said latching mechanism without the operator's hands leaving said carrying handle.
Claim 2
Dependent Claim
141 words
A motor saw of the kind having a driven drum; a band brake around the drum; a pre-tensioned elastic means for supplying a tensioning force to the band; a resilient, fixed carrying handle insulated by elastic elements against vibration; a collapsible arm pivotably connected to a part of the saw which is not insulated against vibrations and arranged adjacent said handle; a latching mechanism actuatable by said collapsible arm which, when released by actuation of the collapsible arm, is arranged to release the brake so that the said band is brought into operation by means of said pre-tensioned elastic means, the improvement which comprises a projection means extending between the carrying handle and the collapsible arm for transmitting a force occurring upon a throw movement of the saw to release said latching mechanism without the operator's hands leaving said carrying handle.
Claim 3
Dependent Claim
17 words
A motor saw according to claim 1, wherein said projection means has the form of a pin.
Claim 4
Dependent Claim
22 words
A motor saw according to claim 2, wherein the collapsible arm is in the form of a forwardly collapsible protective stirrup structure.
Claim 5
Dependent Claim
36 words
A motor saw according to claim 2, wherein said latching means comprises a pawl which is spring-biased in the latching direction, and that said projection means transmits said force in the opening direction of said pawl.
References Cited (Backward Citations)
US2129435A
Cited
FR1313888A
Cited
US3253391A
Cited
US3290871A
Cited
US3776331A
Cited
US3839795A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-09 | 1979-08-11 | 1980-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-09 | 1983-08-11 | 1984-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-09 | 1987-08-11 | 1988-02-10 | $7700.00 | Window Closed / Lapsed |