| 摘要 |
A lawnmower blade construction comprising a disc having a plurality of radially disposed cutting blades pivoted thereto. The blades are positioned for cutting by centrifugal force but are pivotally retractable should they strike an obstruction. Novel means is provided to retain the blades in a retracted and non-cutting position after striking an obstruction to reduce the likelihood of serious injury to a user and of damage to the mower or blade.
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