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Chain saw braking mechanism

  • US 4,152,833 A
  • Filed: 06/22/1977
  • Issued: 05/08/1979
  • Est. Priority Date: 06/22/1977
  • Status: Expired due to Term
First Claim
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1. 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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