| 摘要 |
Knife sharpener comprising a pair of rolling supports providing knife blade guide surfaces of generally frusto-conical form spaced along an axis, an abrasive mounted between the supports and having blade sharpening surfaces respectively facing and making acute angles with the guide surfaces, and risers extending between the guide surfaces and the sharpening surfaces, the risers making angles with the sharpening surfaces larger than the acute angles, at least one of the guide surfaces departing from the frusto-conical form at protuberances spaced angularly from each other with respect to the axis, the protuberances merging into the frusto-conical form.
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