US3608654A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rock drill bit
Assignee: Individual
•
Filing: 1969-11-21
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Granted: 1971-09-28
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Expires: 1989-11-21
Abstract
Abstract A rock drill bit having helical side cutting edges and radial bottom cutting edges, and having an inside cavity for receiving cooling mud, with diametrically opposite downwardly and outwardly inclined outward passages connecting the inside cavity to diametrically opposite grooves between the side cutting edges. The bottom of the bit has a central mud return passage leading to the inside cavity and provided with a ball check valve.
Inventors
- 👤 Joseph W Powell
- 👤 Juanita Powell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:27
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/36; E21B10/38
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
186 words
A rock drill bit comprising a body adapted to be connected to a hollow supporting shank to receive cooling fluid therefrom, said body having a central cavity and a plurality of side cutting teeth having grooves therebetween, respective radial bottom cutting teeth mounted on the bottom of said body and merging with said side cutting teeth, said body being formed at its bottom portion with an axial bore communicating with said central cavity, said bore having a centrally apertured bottom wall opening adjacent the inner ends of said radial bottom teeth, said body having a plurality of sIde passages connecting said central cavity to said respective grooves between pairs of side cutting teeth, and a vibratory ball member loosely disposed in said axial bore and being sealingly engageable over the central aperture of said bottom wall, wherein said side cutting teeth are spirally curved, wherein said side passages are inclined downwardly and outwardly from said central cavity, wherein said side passages are located diametrically opposite each other, and wherein said axial bore is provided with stop means limiting upward movement of said vibratory ball member therein.
Claim 2
Dependent Claim
186 words
A rock drill bit comprising a body adapted to be connected to a hollow supporting shank to receive cooling fluid therefrom, said body having a central cavity and a plurality of side cutting teeth having grooves therebetween, respective radial bottom cutting teeth mounted on the bottom of said body and merging with said side cutting teeth, said body being formed at its bottom portion with an axial bore communicating with said central cavity, said bore having a centrally apertured bottom wall opening adjacent the inner ends of said radial bottom teeth, said body having a plurality of sIde passages connecting said central cavity to said respective grooves between pairs of side cutting teeth, and a vibratory ball member loosely disposed in said axial bore and being sealingly engageable over the central aperture of said bottom wall, wherein said side cutting teeth are spirally curved, wherein said side passages are inclined downwardly and outwardly from said central cavity, wherein said side passages are located diametrically opposite each other, and wherein said axial bore is provided with stop means limiting upward movement of said vibratory ball member therein.
Claim 3
Dependent Claim
39 words
The rock drill bit of claim 1, and wherein said stop means comprises a sleeve member secured in the upper portion of said axial bore and having an inside diameter less than the diameter of the vibratory ball member.
Claim 4
Dependent Claim
26 words
The rock drill bit of claim 1, and wherein said side passages are inclined downwardly and outwardly at an angle of approximately 45* to the horizontal.
Claim 5
Dependent Claim
27 words
The rock drill bit of claim 1, and wherein the bottom wall of the axial bore is formed with a frustoconical ball seat around said central aperture.
Claim 6
Dependent Claim
39 words
The rock drill bit of claim 1, and wherein the underside of said body is formed with a central recess inwardly adjacent the inner ends of the radial bottom teeth, said central aperture opening centrally in said central recess.
Claim 7
Dependent Claim
55 words
The rock drill bit of claim 1, and wherein said central cavity of the body has a frustoconical downwardly convergent bottom wall surface, said axial bore merging with said bottom wall surface at the apex portion of said bottom wall surface, said side passages opening into the central cavity at said frustoconical bottom wall surface.
References Cited (Backward Citations)
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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) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |