US4561812A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extensible drill
Assignee: Individual
•
Filing: 1982-10-11
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Granted: 1985-12-31
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Expires: 2002-10-11
Abstract
Abstract An extensible drill assembly comprising a plurality of separate drill members having different drill diameters which are arranged to permit assembly of two or more of the drill members into a continuous drill combination having a stepwise increasing diameter from the outermost drill member.
Inventors
- 👤 Karl H. Linden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:24
CPC Classifications
B; B23; B23B; B23B51/00; B23B51/009; Y; Y10; Y10T; Y10T408/00; Y10T408/89; Y10T408/892; Y10T408/8923; Y10T408/8928; Y10T408/905; Y10T408/906; Y10T408/9065
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
155 words
An extensible drill assembly for drilling holes of different diameters with the same assembly comprising: (a) a front drill member; (b) a plurality of rear drill members having different drill diameters; (c) the front drill member including at least one cutting portion extending peripherally and axially thereof and means for detachably connecting the front drill member to one or more rear drill members; (d) each rear drill member including first means for detachably connecting one end thereof to either the front drill member or another rear drill member and second means for detachably connecting the other end thereof to either a drilling machine or another rear drill member, whereby the first and second detachable connection means permit the rear drill members to be connected to each other in any desired number and combination; and (e) the connected drill members being of stepwise increasing diameters from the front drill member to the last rear drill member.
Claim 2
Dependent Claim
155 words
An extensible drill assembly for drilling holes of different diameters with the same assembly comprising: (a) a front drill member; (b) a plurality of rear drill members having different drill diameters; (c) the front drill member including at least one cutting portion extending peripherally and axially thereof and means for detachably connecting the front drill member to one or more rear drill members; (d) each rear drill member including first means for detachably connecting one end thereof to either the front drill member or another rear drill member and second means for detachably connecting the other end thereof to either a drilling machine or another rear drill member, whereby the first and second detachable connection means permit the rear drill members to be connected to each other in any desired number and combination; and (e) the connected drill members being of stepwise increasing diameters from the front drill member to the last rear drill member.
Claim 3
Dependent Claim
58 words
The drill assembly of claim 1 wherein: (a) the means for connecting the front drill member to one or more rear drill members includes a threaded tap; (b) the first detachable connection means of each rear drill member includes a threaded recess; and (c) the second detachable connection means of each rear drill member includes a threaded tap.
Claim 4
Dependent Claim
18 words
The drill assembly of claim 1 wherein the front drill member includes two cutting portions of different diameters.
Claim 5
Dependent Claim
30 words
The drill assembly of claim 1 wherein the front drill member and each rear drill member are provided with means engageable by a tool for connecting the drill members together.
Claim 6
Dependent Claim
21 words
The drill assembly of claim 1 wherein the rear drill member having the largest drill diameter is configured for plane countersinking.
Claim 7
Dependent Claim
20 words
The drill assembly of claim 1 wherein the front and rear drill members each include two to four cutting edges.
Claim 8
Dependent Claim
29 words
The drill assembly of claim 1 further including at least one chuck fastener for detachable connection to the second detachable connection means of any of the rear drill members.
Claim 9
Dependent Claim
14 words
The drill assembly of claim 7 further including plural chuck fasteners of different lengths.
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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) | 1988-12-30 | 1989-07-01 | 1989-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-30 | 1993-07-01 | 1993-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-30 | 1997-07-01 | 1997-12-31 | $7700.00 | Window Closed / Lapsed |