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How does an 'inertial' chain-brake work?

Discussion in 'Chainsaw' started by Skooks, Jan 19, 2007.

  1. Skooks

    Skooks ArboristSite Lurker

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    Hi all:

    How does an 'inertial' chain-brake (specifically on a Stihl) work? I have my 026 apart right now and am just curious how the brake is supposed to operate without hitting the hand-guard/brake control?

    Thanks,

    Skooks.
     
  2. windthrown

    windthrown Addicted to ArboristSite

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    Chain brake

    Inertia brake vs the hand lever brake? They use the same braking system, the metal band around drum. They are activated differently. The inertial brake is activated if the saw moves fast enough in a kichback motion. The force of kickback triggers the brake by releasing the catch latch which activates the brake by a spring. The brake is reset/released for both activation methods in the same motion by pulling the brake lever backward.
     
    Last edited: Jan 19, 2007
  3. Lakeside53

    Lakeside53 Stihl Wrenching

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    It's activated by a sudden upwards movement of the saw. The brake handle opposes this force (it's "hinged") and activates.
     

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