Importance

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Abstract

A rotary lawn mower blade mounted on a blade carrier by diametrically spaced bolts is further retained against release from the drive shaft by a retainer fixed on the drive shaft and having a cylindrical shank extending in bearing relation through a central opening in the blade having an enlarged head to obstruct separation of the blade from the retainer. The head includes at least one radial projection and the opening one radial extension, and the head and opening have one orientation in which the same are in registry to permit axial removal of the blade from the retainer. Preferably, the head is triangular with three truncated apexes, one of which is longer than the others and another of which may be wider than all others. The sides of the triangular blade opening lie tangent to the cylindrical retainer shank to hold the blade concentric with such shank.

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First Claim