US5494382A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill bit
Assignee: Amic Industries Ltd
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Filing: 1994-04-19
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Granted: 1996-02-27
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Expires: 2014-04-19
Abstract
Abstract A rotary or rotary/percussion drill bit 10 has a taper socket 14 in one end. A wall 18 bounds the socket 14. A plurality of recesses 20 is provided in the wall. In one embodiment, each recess 20 extends longitudially and resembles a flute. It has a valley 22 flanked by peaks 24. In another embodiment, the recesses may be circumferential, e.g. helical.
Inventors
- 👤 Stephanus F. Kloppers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:57
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/02; E21B17/04; E21B17/046; Y; Y10; Y10T; Y10T408/00; Y10T408/89; Y10T408/907; Y10T408/909; Y10T408/9098
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
91 words
A drill bit which includes a body which has a mounting socket having a mouth towards an end of the body, the socket being defined by a wall of round female frusto-conical shape tapering from the mouth inwardly, the wall having a plurality of recesses formed and arranged to leave intact internal ridges or peaks coinciding with said round female frusto-conical shape, the body being of hardened and tempered metal to render the ridges or peaks plastically deformable to enhance frictional receipt of the body over a complementally round frusto-conical shaft.
Claim 2
Dependent Claim
91 words
A drill bit which includes a body which has a mounting socket having a mouth towards an end of the body, the socket being defined by a wall of round female frusto-conical shape tapering from the mouth inwardly, the wall having a plurality of recesses formed and arranged to leave intact internal ridges or peaks coinciding with said round female frusto-conical shape, the body being of hardened and tempered metal to render the ridges or peaks plastically deformable to enhance frictional receipt of the body over a complementally round frusto-conical shaft.
Claim 3
Dependent Claim
38 words
A drill bit as claimed in claim 1 in which the recesses are of curved concave cross-sectional shape resembling flutes, the peaks or ridges having correspondingly curved, concave sides rendering the ridges or peaks narrower than the recesses.
Claim 4
Dependent Claim
17 words
A drill bit as claimed in claim 1 in which said internal ridges or peaks extend longitudinally.
Claim 5
Dependent Claim
17 words
A drill bit as claimed in claim 1 in which said internal ridges or peaks extend circumferentially.
Claim 6
Dependent Claim
128 words
A combination of a shaft having a frusto-conical end portion of round cross-section and smooth surface; and a drill bit which includes a body which has a mounting socket having a mouth toward an end of the body, the socket being defined by a wall of round female frusto-conical shape tapering from the mouth inwardly and being complemental to and receivable over said end portion of the shaft, the wall having a plurality of recesses formed and arranged to leave intact internal ridges or peaks coinciding with said round female frusto-conical shape to interface with said smooth surface of the end portion of the shaft, the body being of hardened and tempered metal to allow plastic deformation of the ridges and peaks against said smooth surface in use.
Claim 7
Dependent Claim
128 words
A combination of a shaft having a frusto-conical end portion of round cross-section and smooth surface; and a drill bit which includes a body which has a mounting socket having a mouth toward an end of the body, the socket being defined by a wall of round female frusto-conical shape tapering from the mouth inwardly and being complemental to and receivable over said end portion of the shaft, the wall having a plurality of recesses formed and arranged to leave intact internal ridges or peaks coinciding with said round female frusto-conical shape to interface with said smooth surface of the end portion of the shaft, the body being of hardened and tempered metal to allow plastic deformation of the ridges and peaks against said smooth surface in use.
Claim 8
Dependent Claim
37 words
A combination as claimed in claim 5 in which the recesses are of curved concave cross-sectional shape resembling flutes, the ridges or peaks having correspondingly curved, concave sides rendering the ridges or peaks narrower than the recesses.
Claim 9
Dependent Claim
16 words
A combination as claimed in claim 5 in which said internal ridges or peaks extend longitudinally.
Claim 10
Dependent Claim
16 words
A combination as claimed in claim 5 in which said internal ridges or peaks extend circumferentially.
Claim 11
Dependent Claim
131 words
A combination of a shaft having a frusto-conical end portion of round cross-section and smooth surface; and a drill bit which includes a body which has a mounting socket having a mouth toward an end of the body, the socket being defined by a wall of round female frusto-conical shape tapering from the mouth inwardly and being complemental to said end portion of the shaft, the wall having a plurality of recesses formed and arranged to form internal ridges or peaks coinciding with said round female frusto-conical shape, the body being of hardened and tempered metal., the end portion of the shaft being forcefully, frictionally received within said mounting socket, such that said ridges or peaks interface under plastic deformation with said smooth surface of the end portion of the shaft.
Claim 12
Dependent Claim
131 words
A combination of a shaft having a frusto-conical end portion of round cross-section and smooth surface; and a drill bit which includes a body which has a mounting socket having a mouth toward an end of the body, the socket being defined by a wall of round female frusto-conical shape tapering from the mouth inwardly and being complemental to said end portion of the shaft, the wall having a plurality of recesses formed and arranged to form internal ridges or peaks coinciding with said round female frusto-conical shape, the body being of hardened and tempered metal., the end portion of the shaft being forcefully, frictionally received within said mounting socket, such that said ridges or peaks interface under plastic deformation with said smooth surface of the end portion of the shaft.
Claim 13
Dependent Claim
33 words
A combination as claimed in claim 9, in which said plastic deformation of the ridges or peaks varies in degree from one position to another to accommodate surface irregularities of said smooth surface.
Claim 14
Dependent Claim
37 words
A combination as claimed in claim 9, in which said plastic deformation of the ridges or peaks varies in degree from one position to another to compensate for manufacturing inaccuracies in said end portion of the shaft.
Claim 15
Dependent Claim
51 words
A combination as claimed in claim 9 in which the recesses are of curved, concave cross-sectional shape resembling flutes, the ridges or peaks having correspondingly curved concave sides rendering the ridges or peaks sharp, in which combination said ridges or peaks cut through relatively soft foreign matter on said smooth surface.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-02-26 | 1999-08-28 | 2000-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-02-26 | 2003-08-28 | 2004-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-02-26 | 2007-08-28 | 2008-02-27 | $7700.00 | Window Closed / Lapsed |