(under subclass 67) Subject matter wherein a tool engages the work with a sudden blow or impact.
(1) Note. Many of the disclosures in this subclass show a plurality of tools surrounding (or surrounded by) work and delivering a quick succession of impacts to the work during the relative rotation of the tool and work. For similar structure wherein relative rotation does not occur, see subclass 402, wherein the tools surround the work, and subclass 393, wherein the work surrounds the tools.
SEE OR SEARCH THIS CLASS, SUBCLASS:
393, for similar structure including a tool that is surrounded by the work but does not involve relative rotation between the tool and work.
402, for similar structure including a tool that surrounds the work but does not involve relative rotation between the tool and work.
