IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0808734
(1977-06-22)
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발명자
/ 주소 |
- Phillips William R. (Sacramento CA)
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출원인 / 주소 |
- Crow, Lytle, Gilwee, Donoghue, Adler and Weineger (Sacramento CA 02)
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인용정보 |
피인용 횟수 :
108 인용 특허 :
1 |
초록
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An apparatus and method for the prevention of injury to the operator of a chain saw, which saw includes on-off actuating means, a housing, an engine within said housing, a guide bar, connected to the housing, a cutting chain carried by said bar, said engine having a drive shaft operably connected th
An apparatus and method for the prevention of injury to the operator of a chain saw, which saw includes on-off actuating means, a housing, an engine within said housing, a guide bar, connected to the housing, a cutting chain carried by said bar, said engine having a drive shaft operably connected thereto, and to a centrifugal clutch, a flywheel, gear means meshed in driving engagement with said cutting chain and said flywheel, said clutch engageable with said flywheel for driving said cutting chain, a brake system for slowing the speed of the flywheel to a stop during operation of the saw, and a secondary brake to prevent the re-engagement of the clutch with the flywheel while the on-off actuating switch is on. The brake becoms operative as a result of an electromechanical sensing of a kickback condition, as does the secondary brake. The method includes providing an electro-mechanical sensing of a kickback, and providing a self-energizing braking of the flywheel, and preventing the re-engagement of the clutch with the flywheel.
대표청구항
▼
In a chain saw having a housing, and an engine in said housing, an activation means for the engine, a chain bar connected to said housing, a cutting chain operably carried by said chain bar; said engine including a drive shaft, operably connectable to said cutting chain, a centrifugal clutch, gear m
In a chain saw having a housing, and an engine in said housing, an activation means for the engine, a chain bar connected to said housing, a cutting chain operably carried by said chain bar; said engine including a drive shaft, operably connectable to said cutting chain, a centrifugal clutch, gear means meshed in driving engagement with said cutting chain, journalled for free rotation on said drive shaft, a flywheel rigidly secured to said gear means, said centrifugal clutch positioned within said flywheel and connected to said drive shaft, said clutch operable for connecting said drive shaft to said gear means, upon engagement of said clutch with said flywheel, for driving said cutting chain, the improvement comprising; (a) electromechanical means for sensing movement of the chain abruptly from a predetermined direction to another direction, and for providing an electrical signal in response thereto; (b) means responsive to said electrical signal for activating a brake system to disengage and to stop the driving of the cutting chain.
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