US4076444A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill bit extension
Assignee: Individual
•
Filing: 1974-03-29
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Granted: 1978-02-28
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Expires: 1994-03-29
Abstract
Abstract The drill bit extension which utilized a length of conventional pipe or thin wall conduit without modification. A chuck adapter fitting and a drill bit adapter fitting are located at opposite ends of the pipe. Both have a pilot portion adapted to extend into the pipe, and a threaded tapered portion which engages the pipe interior. The chuck adapter fitting has a reduced shank to be received in a conventional drill chuck; and the drill adapter fitting has an opening with means for locking a drill bit into the fitting. Since the fittings are used with an unmodified pipe, the pipe section can be used in drilling the holes and then left in place after the fittings are removed. In this manner, water lines and electrical conduit may be installed simultaneously with drilling the required holes therefore.
Inventors
- 👤 Gary L. Siebrecht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:07
CPC Classifications
B; B23; B23Q; B23Q1/00; B23Q1/70; B23Q1/703; Y; Y10; Y10T; Y10T408/00; Y10T408/89; Y10T408/907; Y10T408/94; Y10T408/95; Y10T408/957
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
205 words
A drill bit extension for use with a drill bit comprising, a length of pipe having an unthreaded internal wall of preselected internal pipe size, a drill bit adapter fitting removably mounted in one end of the length of pipe and a chuck adapter fitting removably mounted in the other end of the length of pipe, said adapter fittings each including an externally threaded taper portion tapering from a minor outer diameter no larger than the internal pipe size to a major outer diameter sufficiently larger than the internal pipe size to form a binding fit with the pipe when turning threinto, said adapter fittings each including a pilot portion extending from the minor outer diameter end of the threaded taper portion and having an outer diameter substantially equal to said minor outer diameter and slidable in the pipe to maintain the axis of the respective fitting in alignment with the pipe axis when turning the threaded taper portion into the pipe, the drill bit adapter fitting having chuck means coaxial therewith for receiving the shank of the drill bit, and said chuck adapter fitting having shank means extending axially from the major end of its threaded taper portion for reception in a drill chuck.
Claim 2
Dependent Claim
205 words
A drill bit extension for use with a drill bit comprising, a length of pipe having an unthreaded internal wall of preselected internal pipe size, a drill bit adapter fitting removably mounted in one end of the length of pipe and a chuck adapter fitting removably mounted in the other end of the length of pipe, said adapter fittings each including an externally threaded taper portion tapering from a minor outer diameter no larger than the internal pipe size to a major outer diameter sufficiently larger than the internal pipe size to form a binding fit with the pipe when turning threinto, said adapter fittings each including a pilot portion extending from the minor outer diameter end of the threaded taper portion and having an outer diameter substantially equal to said minor outer diameter and slidable in the pipe to maintain the axis of the respective fitting in alignment with the pipe axis when turning the threaded taper portion into the pipe, the drill bit adapter fitting having chuck means coaxial therewith for receiving the shank of the drill bit, and said chuck adapter fitting having shank means extending axially from the major end of its threaded taper portion for reception in a drill chuck.
Claim 3
Dependent Claim
59 words
A drill bit extension according to claim 1 wherein said chuck means comprises a coaxial passage in the drill bit adapter fitting opening at the end remote from the pilot portion for receiving the shank of a drill bit, and locking means on the drill bit adapter fitting intersecting said passage for engaging the shank of the drill bit.
Claim 4
Dependent Claim
24 words
A drill bit extension according to claim 2 wherein said locking means is mounted on the pilot portion of said drill bit adapter fitting.
Claim 5
Dependent Claim
23 words
A drill bit extension according to claim 1 wherein said taper on said externally threaded taper portion is about 0.15 inches per inch.
Claim 6
Dependent Claim
47 words
A drill bit extension according to claim 1 wherein each of said adapter fittings have a multi-sided head portion at the major diameter end of the threaded taper portion for receiving a tool for turning the respective adapter fitting into and out of the length of pipe.
Claim 7
Dependent Claim
31 words
A drill bit extension according to claim 5 wherein the threads on said threaded taper portion of said adapter fittings are in a range of 18 to 24 threads per inch.
Claim 8
Dependent Claim
208 words
A drill bit extension kit for use with a length of pipe having an unthreaded internal wall of preselected internal pipe size to form a drill bit extension comprising, a drill bit adapter fitting adapted to be removably mounted on one end of the length of pipe and a chuck adapter fitting adapter to be mounted on the other end of the length of pipe, said adapter fittings each including an externally threaded taper portion, tapering from a minor outer diameter at one end to a major outer diameter at the other end, said adapter fittings each including a pilot portion extending from said one end of the respective threaded taper portion and having an outer diameter substantially equal to said minor outer diameter of the taper threaded portion, said adapter fittings each having a non-circular head at said other end of said threaded taper portion for receiving a tool for turning the respective adapter fitting into a length of pipe, said drill bit adapter fitting having an axial socket at the end remote from its pilot portion for receiving a drill bit shank, and said chuck adapter fitting having a shank extending axially from the end remote from its pilot portion for reception in a drill chuck.
Claim 9
Dependent Claim
208 words
A drill bit extension kit for use with a length of pipe having an unthreaded internal wall of preselected internal pipe size to form a drill bit extension comprising, a drill bit adapter fitting adapted to be removably mounted on one end of the length of pipe and a chuck adapter fitting adapter to be mounted on the other end of the length of pipe, said adapter fittings each including an externally threaded taper portion, tapering from a minor outer diameter at one end to a major outer diameter at the other end, said adapter fittings each including a pilot portion extending from said one end of the respective threaded taper portion and having an outer diameter substantially equal to said minor outer diameter of the taper threaded portion, said adapter fittings each having a non-circular head at said other end of said threaded taper portion for receiving a tool for turning the respective adapter fitting into a length of pipe, said drill bit adapter fitting having an axial socket at the end remote from its pilot portion for receiving a drill bit shank, and said chuck adapter fitting having a shank extending axially from the end remote from its pilot portion for reception in a drill chuck.
Claim 10
Dependent Claim
23 words
A drill bit extension bit according to claim 7 wherein said thread taper portion has a taper of about 0.15 inches per inch.
Claim 11
Dependent Claim
47 words
A drill bit extension bit according to claim 7 wherein said socket extends into the pilot portion of said drill bit adapter fitting and means on said pilot portion of the drill bit adapter fitting intersects said socket for locking a drill bit shank in the fitting.
Claim 12
Dependent Claim
19 words
A drill bit extension according to claim 1 wherein said pilot portion has a length greater than its diameter.
Claim 13
Dependent Claim
36 words
A drill bit extension according to claim 1 wherein the threads at the minor outer diameter end of the externally threaded taper portion have a root diameter less than the outer diameter of the pilot portion.
Claim 14
Dependent Claim
20 words
A drill bit extension kit according to claim 7 wherein said pilot portion has a length greater than its diameter.
Claim 15
Dependent Claim
37 words
A drill bit extension kit according to claim 7 wherein the threads at the minor outer diameter end of the externally threaded taper portion have a root diameter less than the outer diameter of the pilot portion.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |