| 摘要 |
An arm and blade assembly for a rotary lawn mower is provided comprising an arm member defining a pair of arms, and a pair of blades, one affixed at the end of each arm, the blades being affixed to the arms by means of a keystone or dovetail joint providing restriction with respect to longitudinal and lateral movement, and a sleeve disposed over the joint providing restriction with regard to vertical movement, thereby providing a safe and positive means for readily affixing and detaching the blades to and from the arms.
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