Claims
- 1. A plug cutter comprising a shank connected to a body and a plurality of blades depending from the body that define a bore having, progressing away from the body, a constant diameter portion and a gently outwardly flared portion that is longer than the constant diameter portion and terminates at tips that define a mouth that is wider than any other portion of the bore.
- 2. A plug cutter comprising a shank connected to a body and a plurality of blades depending from the body that define a bore having, progressing away from the body, a constant diameter portion and an outwardly flared portion that is longer than the constant diameter portion and terminates at tips that define a mouth that is wider than any other portion of the bore, wherein the blades further define a rounded portion between the body and the constant diameter portion.
- 3. The plug cutter of claim 1 wherein the blades are substantially helical and contain cutting edges at the tips and scraping edges defining the bore.
- 4. A plug cutter comprising a shank connected to a body and a plurality of blades depending from the body that define a bore having, progressing away from the body, a constant diameter portion and an outwardly flared portion terminating at tips that define a mouth that is wider than any other portion of the bore, wherein the flared portion flares outwardly at approximately 3.degree..
- 5. A plug cutter comprising:
- a) a shank;
- b) a body having a shoulder; and
- c) a plurality of helical blades having tips containing scraping edges that define a longitudinal bore within the body, the bore having, progressing from the body, a rounded edge producing portion, a constant diameter portion and a flared portion flaring outwardly away from the constant diameter portion at approximately 3.degree. and cutting edges at the tips that define a mouth that is wider than any other portion of the bore.
Parent Case Info
This is a continuation of copending application Ser. No. 07/614,618 filed on Nov. 16, 1990, now abandoned.
US Referenced Citations (13)
Foreign Referenced Citations (4)
Number |
Date |
Country |
293770 |
Mar 1915 |
DE2 |
1040092 |
May 1953 |
FRX |
2535635 |
May 1984 |
FRX |
96710 |
Jun 1982 |
JPX |
Non-Patent Literature Citations (1)
Entry |
Trend Routing Technology Catalog p. 43. |
Continuations (1)
|
Number |
Date |
Country |
Parent |
614618 |
Nov 1990 |
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