US4547020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotatable cutting bit
Assignee: Rogers Tool Works Inc
•
Filing: 1983-05-09
•
Granted: 1985-10-15
•
Expires: 2003-05-09
Abstract
Abstract A rotatable cutting insert of the type having a shank depending from a head portion and having a hard insert mounted therein, includes an improved insert comprising a heat conducting base section disposed within a cavity in an intermediate section.
Inventors
- 👤 Randall W. Ojanen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:36
CPC Classifications
E; E21; E21C; E21C35/00; E21C35/18; E21C35/183; E21C35/1835; E21C35/1837
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
108 words
A rotatable cutting bit comprising a head portion, a shank portion depending from said head portion along a longitudinal axis, said head portion having a socket at the forward end, a hard insert having coaxially aligned an integral sections, said sections comprising a nose section, a base section, and an intermediate section contiguous said base and said nose section, said intermediate section having a cavity at the rearward end, said base section comprising a material of greater thermal conductivity than said intermediate section, a portion of said base being disposed in said cavity and another portion exiting rearwardly in said socket for conducting heat away from the insert.
Claim 2
Dependent Claim
108 words
A rotatable cutting bit comprising a head portion, a shank portion depending from said head portion along a longitudinal axis, said head portion having a socket at the forward end, a hard insert having coaxially aligned an integral sections, said sections comprising a nose section, a base section, and an intermediate section contiguous said base and said nose section, said intermediate section having a cavity at the rearward end, said base section comprising a material of greater thermal conductivity than said intermediate section, a portion of said base being disposed in said cavity and another portion exiting rearwardly in said socket for conducting heat away from the insert.
Claim 3
Dependent Claim
32 words
A rotatable cutting bit according to claim 1 wherein said base portion is entirely disposed in said socket and at least a portion of said intermediate section is disposed in said socket.
Claim 4
Dependent Claim
28 words
A rotatable cutting bit according to claim 2 wherein said base includes a forward portion disposed in said cavity and a rearward section projecting rearward at said cavity.
Claim 5
Dependent Claim
20 words
A rotatable cutting bit according to claim 3 wherein said insert is fixedly held to said head portion by brazing.
References Cited (Backward Citations)
US3299186A
Cited
US3455000A
Cited
US3830321A
Cited
US3970158A
Cited
DE2610734A1
Cited
SU632497A1
Cited
DE2849711A1
Cited
US4199039A
Cited
SU757701A1
Cited
US4176725A
Cited
US4277106A
Cited
US4307984A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-14 | 1989-04-15 | 1989-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-14 | 1993-04-15 | 1993-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-14 | 1997-04-15 | 1997-10-15 | $7700.00 | Window Closed / Lapsed |