| 摘要 |
The present invention provides a slippage apparatus adapted for use with a vegetation cutting device including a blade and a prime mover having an output shaft. The slippage apparatus includes an adapter rotatable with the blade. The adapter also includes a bore defining a sidewall. The slippage apparatus also includes an insert received in the bore. The insert includes an aperture to receive the output shaft, a first radial thickness, and a second radial thickness defining a groove having a bottom surface spaced from the sidewall. The second radial thickness is less than the first radial thickness. The insert also includes a first key extending toward a central axis of the out shaft that engages a keyway in the output shaft. The first key is positioned adjacent the groove. The insert is adapted to at least partially crack at the groove when the blade strikes an object.
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