Cutters – for shaping – Rectilinear broach
Reexamination Certificate
2000-07-14
2003-05-06
Tsai, Henry W. H. (Department: 2183)
Cutters, for shaping
Rectilinear broach
C407S015000, C407S019000
Reexamination Certificate
active
06558086
ABSTRACT:
FIELD OF THE INVENTION
This present invention is generally related to cutting tools for use in machining operations, such as milling. In particular, this invention is related to a broach for supporting disposable carbide inserts.
BACKGROUND OF THE INVENTION
Broaches have been commonly used for machining metal, and for specific machine operations, such as cutting slots, openings, and channels of specialized cross-section. Conventional broaches are unitary in construction. Such broaches have a plurality of teeth formed on a single solid stick-like member. The quality of such a broach is only as good as its worst tooth. The existence of a few worn teeth often require that the entire broach be discarded, even though useful life remains in some of its teeth.
Conventional broaches are formed of high-speed steel. Tougher, more expensive materials, such as carbides, cannot be used because of prohibitive costs associated with the tools manufactured of such materials. Moreover, damage to any part of a conventional broach dictates the replacement of the entire tool.
What is needed is a cost-effective broach that does not necessitate disposal when a single portion thereof is worn or damaged.
SUMMARY OF THE INVENTION
The present invention is directed towards a cost-effective broach for supporting cutting inserts. Such a broach does not warrant disposal when a single cutting insert becomes worn or damaged. The broach comprises an elongate body. The body has a plurality of longitudinally spaced pockets therein. A threaded hole is provided in each of the pockets. The pockets are adapted to receive cutting inserts. The cutting inserts have a hole that is adapted to align with a hole in the pockets. The aligning holes are adapted to receive insert screws. The insert screws are threadably received in the threaded hole in the pockets. When a cutting insert becomes worn or damaged, it may be removed from its pocket and replaced with another cutting insert. Hence, the broach need not be discarded because of a worn or damaged cutting insert.
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Affidavit executed by inventor David A. Rigotti on Apr. 23, 2001, and inventor Gregory J. Lavoie on Apr. 27, 2001.
Lavoie Gregory J.
Rigotti David A.
Kennametal Inc.
Meenan Larry R.
Tsai Henry W. H.
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