US6572311B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-piece drill bits
Assignee: Team Fair Holdings Ltd
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Filing: 2001-07-24
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Granted: 2003-06-03
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Expires: 2021-07-24
Abstract
Abstract Two-piece drill bits and methods of manufacturing same provide a preferably hexagonal shank, and a drill portion having a proximal end inserted into an axial hole in a distal end of the shank. In a preferred embodiment, at least part of the area adjacent the proximal end of the drill portion is knurled. Alternative embodiments have wings, polygons, tapers or other irregular shapes, or combinations of same. A variety of means may be employed to mechanically capture the drill portion in the shank.
Inventors
- 👤 Kailash C. Vasudeva
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:06
CPC Classifications
B; B23; B23B; B23B31/00; B23B31/005; B23B2231/00; B23B2231/02; B23B2231/0204; B23B2231/0216; B23B2231/0232; B23B2231/026; B23B2231/0264; B23B2231/0268; B23B2231/028; B23B2240/00; B23B2240/28; B23B2251/00; B23B2251/02; Y; Y10; Y10T; Y10T408/00; Y10T408/89; Y10T408/907; Y10T408/909; Y10T408/94; Y10T408/95; Y10T408/957
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
60 words
A two-piece drill bit having a shank tightly compressed against a drill portion, said shank having a proximal end for mounting and a distal end having an axial hole for receiving a proximal end section of said drill portion, said drill portion further comprising: two knurled portions separated by an unknurled portion at the proximal end of said drill portion.
Claim 2
Dependent Claim
60 words
A two-piece drill bit having a shank tightly compressed against a drill portion, said shank having a proximal end for mounting and a distal end having an axial hole for receiving a proximal end section of said drill portion, said drill portion further comprising: two knurled portions separated by an unknurled portion at the proximal end of said drill portion.
Claim 3
Dependent Claim
20 words
The two-piece drill bit of claim 1 , wherein a number of wings extend radially outwardly from the unknurled portion.
Claim 4
Independent Claim
128 words
A method of manufacturing a two-piece drill bit, said two-piece drill bit comprising a shank and a drill portion, said shank having a proximal end for mounting and a distal end having an axial hole for receiving a proximal end section of said drill portion, said method comprising the steps of: forming a knurled portion on at least a portion of said proximal end section of said drill portion; drilling an axial hole at a distal end of said shank; inserting said proximal end section of said drill portion into said axial hole; and, mechanically deforming at least a portion of said shank to symmetrically compress said shank onto said drill portion after said insertion of said proximal end section of said drill portion into said axial hole.
Claim 5
Independent Claim
128 words
A method of manufacturing a two-piece drill bit, said two-piece drill bit comprising a shank and a drill portion, said shank having a proximal end for mounting and a distal end having an axial hole for receiving a proximal end section of said drill portion, said method comprising the steps of: forming a knurled portion on at least a portion of said proximal end section of said drill portion; drilling an axial hole at a distal end of said shank; inserting said proximal end section of said drill portion into said axial hole; and, mechanically deforming at least a portion of said shank to symmetrically compress said shank onto said drill portion after said insertion of said proximal end section of said drill portion into said axial hole.
Claim 6
Dependent Claim
22 words
The method of claim 3 , wherein said axial hole and said proximal end section of said drill portion are correspondingly tapered.
Claim 7
Dependent Claim
26 words
The two-piece drill bit of claim 1 , wherein said axial hole is tapered, and said proximal end section of said drill portion is correspondingly tapered.
Claim 8
Dependent Claim
18 words
The method of claim 3 , wherein the step of mechanically deforming includes rolling, peening, roll-peening, and pressing.
Claim 9
Dependent Claim
19 words
The method of claim 3 , wherein the step of forming a knurled portion includes forming a cross-hatched pattern.
Claim 10
Dependent Claim
29 words
The method of claim 3 , wherein the step of forming includes forming wings extending radially outwardly on the portion of said proximal end section of said drill portion.
Claim 11
Dependent Claim
53 words
The two-piece drill bit of claim 1 , wherein said shank has a proximal portion having one cross-sectional dimension, and a distal portion having a large cross-sectional dimension, said distal portion accommodating drill portions of a larger diameter than if said distal portion was of the same cross-sectional dimension as said proximation portion.
Claim 12
Dependent Claim
53 words
A two-piece drill bit having a shank tightly compressed against a drill portion, said shank having a proximal end for mounting and a distal end having an axial hole for receiving a proximal end section of said drill portion, comprising: wings extending radially outwardly from said proximal end section of said drill portion.
Claim 13
Dependent Claim
53 words
A two-piece drill bit having a shank tightly compressed against a drill portion, said shank having a proximal end for mounting and a distal end having an axial hole for receiving a proximal end section of said drill portion, comprising: wings extending radially outwardly from said proximal end section of said drill portion.
Claim 14
Dependent Claim
14 words
The two-piece drill bit of claim 10 , wherein said wings include barbed wings.
Claim 15
Dependent Claim
30 words
The method of claim 3 , wherein the step of forming includes forming barbed wings extending radially outwardly on the portion of said proximal end section of said drill portion.
Claim 16
Dependent Claim
86 words
A two-piece drill bit having a shank tightly compressed against a drill portion, said shank having a proximal end for mounting and a distal end having an axial hole for receiving a proximal end section of said drill portion, characterized by said axial hole being tapered, and said drill portion having a correspondingly tapered proximal end, said drill portion comprising: a knurled portion at said tapered proximal end of said drill portion; and, an unknurled portion adjacent said tapered proximal end section of said drill portion.
Claim 17
Dependent Claim
86 words
A two-piece drill bit having a shank tightly compressed against a drill portion, said shank having a proximal end for mounting and a distal end having an axial hole for receiving a proximal end section of said drill portion, characterized by said axial hole being tapered, and said drill portion having a correspondingly tapered proximal end, said drill portion comprising: a knurled portion at said tapered proximal end of said drill portion; and, an unknurled portion adjacent said tapered proximal end section of said drill portion.
Claim 18
Dependent Claim
15 words
The two-piece drill bit of claim 13 , wherein the knurled portion has cross-hatched pattern.
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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) | 2006-06-02 | 2006-12-02 | 2007-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-06-02 | 2010-12-02 | 2011-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-06-02 | 2014-12-02 | 2015-06-03 | $7700.00 | Window Closed / Lapsed |