US3842632A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacture of lightweight,high-speed dental drill
Assignee: Individual
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Filing: 1973-03-28
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Granted: 1974-10-22
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Expires: 1993-03-28
Abstract
Abstract A method of forming a lightweight, high-speed dental drill having integrally formed head and shank portions is disclosed. A piece of metal tubing is selected and the wall thickness thereof is reduced over the head portion of the drill. Thereafter the drill is swage formed to the desired external configuration, and the reduced wall thickness is the head portion insures that a bore of maximum dimension is maintained from the tubular shank portion to and through the drill head portion to the tip end. The hollow, very small diameter and high strength dental drill thus formed is employed advantageously in high-speed, air turbine dental handpieces. Reduction of the wall thickness of the head portion is accomplished by several types of forming steps, and swaging may additionally be employed to form the shank portion of the drill and before reducing the wall thickness of the head portion. Passageways are formed in the head portion to connect to the tubular bore in the head portion for aeration of the drill or flow of coolant therefrom.
Inventors
- 👤 M Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:54
CPC Classifications
B; B21; B21J; B21J7/00; B21J7/02; B21J7/14; B21J7/16; B21K; B21K5/00; B21K5/02; A; A61; A61C; A61C3/00; A61C3/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
145 words
In a method of manufacturing a lightweight, high-speed dental drill having an integrally formed head portion and shank portion, and including the steps of selecting a piece of metal tubing having predetermined dimensions, and swage forming a first end of said tubing to substantially the desired external configuration of said head portion, the improvement comprising the step of: reducing the wall thickness of said tubing over substantially the entire length of said head portion prior to said swage forming step, said reducing step being effected in an amount combining with said selecting step to produce a head portion after said swaging step having a mass distribution for maximization of rotational velocities, a central bore in said head portion extending over substantially the entire length thereof, and a wall strength in said head portion sufficient to withstand the high rotational velocities and loading forces during use.
Claim 2
Dependent Claim
145 words
In a method of manufacturing a lightweight, high-speed dental drill having an integrally formed head portion and shank portion, and including the steps of selecting a piece of metal tubing having predetermined dimensions, and swage forming a first end of said tubing to substantially the desired external configuration of said head portion, the improvement comprising the step of: reducing the wall thickness of said tubing over substantially the entire length of said head portion prior to said swage forming step, said reducing step being effected in an amount combining with said selecting step to produce a head portion after said swaging step having a mass distribution for maximization of rotational velocities, a central bore in said head portion extending over substantially the entire length thereof, and a wall strength in said head portion sufficient to withstand the high rotational velocities and loading forces during use.
Claim 3
Dependent Claim
87 words
A method of manufacturing a dental drill as defined in claim 1 wherein, said head portion is formed during said swage forming step with a frusto-conical surface having the small diameter end thereof proximate the distal end of said head portion and having a wall thickness progressively increasing and a bore diameter progressively decreasing in the direction of said distal end, said bore diameter progressively decreasing toward said distal end at a rate faster than the rate of decrease of the outside diameter of said head portion.
Claim 4
Dependent Claim
76 words
A method of manufacturing a dental drill as defined in claim 1 and the step of: forming at least one passageway terminating in an opening in said head portion, said passageway extending between said bore in said head portion and the exterior surface of said head portion, said reducing step being accomplished to an amount insuring sufficient strength in said head portion after formation of said passageway for high speed rotation and use of said drill.
Claim 5
Dependent Claim
62 words
A method of manufacturing a dental drill as defined in claim 1 wherein, said reducing step is accomplished by machining a portion of said tubing from the interior surface thereof to effect the removal of excess tubing mass at larger diameter portions of said head portion and to insure a continuation of said bore at smaller diameter portions of said head portion.
Claim 6
Dependent Claim
68 words
A method of manufacturing a dental drill as defined in claim 1 wherein, said reducing step is accomplished by machining a portion of said tubing off the exterior surface thereof, said selecting step being accomplished to insure continuation of said bore at smaller diameter portions of said head portion and said reducing step effecting the removal of excess tubing mass at larger diameter portions of said head portion.
Claim 7
Dependent Claim
118 words
A method of manufacturing a dental drill as defined in claim 1 wherein, said metal tubing is selected to have an outside diameter about equal to the largest diameter of said head portion upon completion of said drill and an outside diameter larger than the diameter of said shank portion upon completion of said drill, and the additional steps of: swage forming the second end of said tubing to reduce the outside diameter thereof over a length of said second end defining said shank portion; and after swage forming said first end of said tubing, closing the end of said head portion to terminate said bore and provide a working surface at the distal end of said drill.
Claim 8
Dependent Claim
114 words
A method of manufacturing a dental drill as defined in claim 1 and the steps of: swage forming said head portion before said reducing step to decrease the outside diameter of said head portion to an intermediate diameter, and wherein, said reducing step is accomplished after said head portion is decreased to said intermediate diameter by center boring said head portion to increase said bore substantially over the length of said head portion, and sAid swage forming after said reducing step decreases the diameter of said head portion to a finished diameter; and the step of: thereafter closing the distal end of said head portion to provide a working surface at said distal end.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |