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US 4,531,863 AGranted
Thread-cutting apparatus
AssigneeIngersoll Cutting Tool Company
InventorDarrel E. Smith
Life of this patent
Estimating the term…
Abstract
Thread-cutting apparatus includes an indexable insert having multiple thread-cutting profiles. The invention may be embodied either in a thread-milling insert or a thread-chasing insert. The insert is configured to provide clearance for internal threading and to enable cutting force to be directed through a large cross-sectional area of the insert.
Claims4
An indexable insert for mounting on a holder to form a continuous helical thread on a workpiece surface, the insert comprising:
- at least two rows of cutting teeth, each said row of cutting teeth including a substantially planar forward cutting surface and a grooved back surface intersecting said forward cutting surface to define a cutting edge, said grooved back surface defining a row of parallel ridges extending rearwardly of said forward cutting surface.
- first and second opposite, substantially parallel substantially planar locating surfaces, each intersecting a respective one of said grooved back surfaces and being contiguous therewith, and
- a third substantially planar locating surface located rearwardly of both said rows of cutting teeth and oriented perpendicular to said first and second locating surfaces;
- an included angle A of greater than 180.degree. being defined between each of said first and second locating surfaces and the ridges of the respective grooved surface contiguous therewith.
1 more element
Dependencies are inferred from the claim text.