(under subclass 199) Device including a work-engaging protuberance positioned on the tool-axis, having a sharp helically-disposed edge, which protuberance is axially advanced of the cutting edge of the tool and is specifically adapted to penetrate the work-surface and both stabilize the tool against lateral displacement and pull the rotating tool through the work.
(1) Note. The device of this subclass is not to be confused with the device of Class 83, Cutting or the device of Class 72, Metal Deforming. To be placed herein, the penetrating means must be disclosed solely as means facilitating the securing or aligning of a cutting instrumentality relative to the work and the depression formed must be unused at any other time for any other purpose.
SEE OR SEARCH THIS CLASS, SUBCLASS:
85+, for similar structure including means to "form" a
depression in work, which means is movable relative to the tool during operation.
195, for similar structure wherein there is provision to permit the tool to be positioned relative to the tool-support.
208, for similar structure having a product receiving chamber.
