US4128971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Abrasive drill
Assignee: GLENNEL CORP
•
Filing: 1976-09-14
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Granted: 1978-12-12
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Expires: 1996-09-14
Abstract
Abstract An abrasive drill of small diameter is provided with a cored portion that is eccentric, i.e., lacking a substantial concentric portion, relative to the longitudinal axis of the drill. The core, regardless of shape, is located so that during drill rotation all of the surface of a workpiece within the outline of the end of the drill is abraded by some part of the rotating end of the drill. The drill composition comprises abrasive particles in a less abrasive matrix, and the core is not hollow but comprises relatively non-abrasive material. The drill is formed by deposition of matrix material entraining abrasive particles onto a taut filamentary mandrel. The mandrel preferably comprises one or more round filaments, either straight or twisted together, alongside the longitudinal axis of the drill, and may be metallic, such as copper wire or may be non-metallic, such as nylon or other synthetic polymeric textile fiber composition. The drill diameter may be on the order of a millimeter or so or smaller.
Inventors
- 👤 Bruce W. Dunnington
- 👤 William B. Gernert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:18
CPC Classifications
B; B24; B24D; B24D7/00; B24D7/02; B28; B28D; B28D1/00; B28D1/14; Y; Y10; Y10S; Y10S408/00; Y10S408/704; Y10T; Y10T408/00; Y10T408/81
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
14 words
A cylindrical abrasive drill having an eccentric longitudinal solid, relatively non-abrasive cored portion throughout.
Claim 2
Dependent Claim
14 words
A cylindrical abrasive drill having an eccentric longitudinal solid, relatively non-abrasive cored portion throughout.
Claim 3
Dependent Claim
11 words
Drill according to claim 1, comprising diamond particles as abrasive material.
Claim 4
Dependent Claim
26 words
Drill according to claim 2, wherein the particles are embedded in a matrix of less abrasive material extending throughout the drill cross-section except at the core.
Claim 5
Dependent Claim
22 words
Drill according to claim 1, having a diameter on the order of 10ths of a millimeter to about a millimeter in extent.
Claim 6
Dependent Claim
22 words
Drill according to claim 4, wherein the greatest transverse dimension of the core is between about one-twentieth and one-third the drill diameter.
Claim 7
Dependent Claim
30 words
A cylindrical drill comprising particles of abrasive material and having an eccentric longitudinal solid, relatively non-abrasive cored portion lacking any substantial concentricity relative to the longitudinal axis of the drill.
Claim 8
Dependent Claim
30 words
A cylindrical drill comprising particles of abrasive material and having an eccentric longitudinal solid, relatively non-abrasive cored portion lacking any substantial concentricity relative to the longitudinal axis of the drill.
Claim 9
Dependent Claim
15 words
Drill according to claim 6, wherein the cored portion comprises at least one metallic filament.
Claim 10
Dependent Claim
16 words
Drill according to claim 6, wherein the cored portion comprises at least one synthetic polymeric filament.
Claim 11
Dependent Claim
57 words
In a method of forming the drill of claim 6, the steps of selecting a filamentary member of substantially uniform cross-section and depositing thereon material comprising abrasive particles to obtain a substantially cylindrical article having the longitudinal member as the cored portion, located substantially tangential to the longitudinal axis of the drill and otherwise off the axis.
Claim 12
Dependent Claim
67 words
Method of forming a cylindrical drill having an eccentric longitudinal cored portion and otherwise made up of substantially uniform composition thereacross including abrasive particles in a less abrasive matrix, comprising providing filamentary means as a core mandrel, depositing thereon the matrix material with the abrasive particles entrained therein to obtain a cylindrical outline of drill with the longitudinal axis thereof extending alongside the resulting longitudinal cored portion.
Claim 13
Dependent Claim
67 words
Method of forming a cylindrical drill having an eccentric longitudinal cored portion and otherwise made up of substantially uniform composition thereacross including abrasive particles in a less abrasive matrix, comprising providing filamentary means as a core mandrel, depositing thereon the matrix material with the abrasive particles entrained therein to obtain a cylindrical outline of drill with the longitudinal axis thereof extending alongside the resulting longitudinal cored portion.
Claim 14
Dependent Claim
8 words
Drill formed by the method of claim 10.
Claim 15
Dependent Claim
39 words
Method of forming a cylindrical drill having an eccentric solid, relatively non-abrasive core, comprising providing filamentary means lacking a substantial portion concentric with the longitudinal axis of the drill, and depositing abrasive material thereon to obtain a cylindrical outline.
Claim 16
Dependent Claim
39 words
Method of forming a cylindrical drill having an eccentric solid, relatively non-abrasive core, comprising providing filamentary means lacking a substantial portion concentric with the longitudinal axis of the drill, and depositing abrasive material thereon to obtain a cylindrical outline.
Claim 17
Dependent Claim
8 words
Drill formed by the method of claim 12.
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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) | 1981-12-11 | 1982-06-12 | 1982-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-11 | 1986-06-12 | 1986-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-11 | 1990-06-12 | 1990-12-12 | $7700.00 | Window Closed / Lapsed |