US3583504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gauge cutting bit
Assignee: Mission Manufacturing Co
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Filing: 1969-02-24
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Granted: 1971-06-08
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Expires: 1989-02-24
Abstract
Abstract A solid, button-insert-type percussion bit having a generally cylindrical body with a forwardly facing surface and hardened cutter inserts mounted therein and projecting therefrom. A portion of the surface is of conical or frustoconical contour, and the cutter inserts in this portion are arranged asymmetrically so as to produce a lateral component of body motion under axial percussive blows so that other inserts mounted at the periphery of the bottom surface may more effectively cut and maintain the gauge of the hole.
Inventors
- 👤 Carl V Aalund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:59
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/56
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
84 words
A percussion-type drill bit comprising a body with a forwardly facing surface including at least a portion which is inclined to the axis of the body, cutting elements mounted on said head and projecting laterally therefrom for cutting the sidewall of the hole being drilled and wear-resistant elements applied to said surface portion asymmetrically with respect to said surface for causing lateral cutting motion by said cutting elements responsive to each axial percussive blow applied to said head to maintain the hole at gauge.
Claim 2
Dependent Claim
84 words
A percussion-type drill bit comprising a body with a forwardly facing surface including at least a portion which is inclined to the axis of the body, cutting elements mounted on said head and projecting laterally therefrom for cutting the sidewall of the hole being drilled and wear-resistant elements applied to said surface portion asymmetrically with respect to said surface for causing lateral cutting motion by said cutting elements responsive to each axial percussive blow applied to said head to maintain the hole at gauge.
Claim 3
Dependent Claim
20 words
A drill bit as described in claim 1 in which said cutting and wear resisting elements comprise discrete, hardened inserts.
Claim 4
Dependent Claim
24 words
A drill bit as described in claim 1 in which said surface portion is located substantially centrally of said surface and is generally conical.
Claim 5
Dependent Claim
35 words
A drill bit as described in claim 1 in which said surface includes a part disposed normal to the body axis and further including bottom cutting elements mounted in and projecting forwardly of said surface.
Claim 6
Dependent Claim
54 words
A drill bit as described in claim 1 in which said body has a sidewall structure merging with said forwardly facing surface, said laterally projecting cutting elements projecting outwardly and downwardly from said body substantially along the intersection of said wall structure and said surface for maintaining the gauge of the hole being drilled.
Claim 7
Dependent Claim
103 words
A percussion-type drill bit comprising a body with sidewall structure and a forwardly facing surface including a generally conical portion and a second portion disposed normal to the body axis, wash passages in said body and said surface for lubricating the bit and removing cuttings, first cutter inserts mounted in said conical surface portion asymmetrically with respect to said surface for causing lateral motion of the body when subjected to axial percussive blows in drilling, bottom cutting inserts mounted in and projecting forwardly from said second surface portion, and gauge cutting inserts mounted adjacent the intersection of said sidewall structure and said surface.
Claim 8
Dependent Claim
103 words
A percussion-type drill bit comprising a body with sidewall structure and a forwardly facing surface including a generally conical portion and a second portion disposed normal to the body axis, wash passages in said body and said surface for lubricating the bit and removing cuttings, first cutter inserts mounted in said conical surface portion asymmetrically with respect to said surface for causing lateral motion of the body when subjected to axial percussive blows in drilling, bottom cutting inserts mounted in and projecting forwardly from said second surface portion, and gauge cutting inserts mounted adjacent the intersection of said sidewall structure and said surface.
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) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |