Threaded hole finishing tool
OwnerDavid P. Newmarkinventor
Life of this patent
Estimating the term…
Abstract
A finishing tool rides upward and downward on the surface of a tap. A spring urges the finishing tool toward an outer end of the tap. The finishing tool is guided along a helical flute on the surface of the tap. Cutting edges on the finishing tool are ground to deburr the perimeter of a hole being tapped either during entry of the tap into the hole or during withdrawal. When the cutting edges provide deburring during withdrawal, the helix angle of the helical flute must be less than a critical helix angle to avoid jamming. When the cutting edges provide deburring during entry of the tap, the critical helix-angle limitation is eliminated.
Claims12
A deburring tool for use in conjunction with a threading tap, comprising:
- a tap;
- tapping threads on said tap;
- helical flutes on said tap overlaid on said tapping threads;
- a cutting member fitted over a periphery of said tap;
- means for resiliently urging said cutting member toward an outer end of said tap;
- means in said cutting member for guiding in said helical flutes to rotate said cutting member as said cutting member is forced up said tap against urging of said means for resiliently urging;
- at least one cutting edge on said cutting member;
- and
- said at least one cutting edge being directed to cut burs from said workpiece during one of withdrawal and advance of said tap in said workpiece.
A deburring tool comprising:
- a tap;
- at least one helical flute in a surface of said tap;
- a cutter body fitted on said tap;
- means for guiding said cutter body along said helical flute;
- resilient means for urging said cutter body toward an end of said tap;
- cutting members on said cutter body;
- and
- said cutting members being shaped to deburr a perimeter of a hole during one of advance of said tap into said hole and withdrawal of said tap from said hole.
Dependencies are inferred from the claim text.