Patent US4074922A successfully refreshed from Google Patents.
US4074922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill bit
Assignee: Reed Tool Co
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Filing: 1976-06-11
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Granted: 1978-02-21
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Expires: 1996-06-11
Abstract
Abstract A roller cutter drill bit comprises a body having a journal, a roller cutter, bearing means for rotatively mounting a roller cutter on the journal and a part of said bearing means including a hard, tough metal bushing with a lubricant metal coated thereon, and positioned between the sleeve and the journal and between the sleeve and the roller cutter to prevent galling.
Inventors
- 👤 Henry W. Murdoch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:14
CPC Classifications
F; F16; F16C; F16C17/00; F16C17/12; F16C17/18; E; E21; E21B; E21B10/00; E21B10/08; E21B10/22; F16C33/00; F16C33/02; F16C33/04; F16C33/06; F16C33/12; F16C2352/00; Y; Y10; Y10S; Y10S384/00; Y10S384/90; Y10S384/912
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
99 words
A drill bit, comprising a body having a journal extending therefrom, a roller cutter, bearing means for rotatively mounting said roller cutter on said journal, at least part of said bearing means including a hard tough metal sleeve having a Rockwell C hardness of at least 35 positioned around said journal within said roller cutter, and a metal coating on said sleeve having lubricating properties positioned between said sleeve and said journal and between said sleeve and said roller cutter, said metal coating imparting sufficient lubricity to said sleeve to prevent galling of said roller cutter and said journal.
Claim 2
Dependent Claim
99 words
A drill bit, comprising a body having a journal extending therefrom, a roller cutter, bearing means for rotatively mounting said roller cutter on said journal, at least part of said bearing means including a hard tough metal sleeve having a Rockwell C hardness of at least 35 positioned around said journal within said roller cutter, and a metal coating on said sleeve having lubricating properties positioned between said sleeve and said journal and between said sleeve and said roller cutter, said metal coating imparting sufficient lubricity to said sleeve to prevent galling of said roller cutter and said journal.
Claim 3
Dependent Claim
16 words
A drill bit according to claim 1 wherein said metal coating is plated on said sleeve.
Claim 4
Dependent Claim
10 words
A drill bit according to claim 1 wherein said metal
Claim 5
Dependent Claim
8 words
coating is applied to said sleeve by metalizing.
Claim 6
Dependent Claim
8 words
coating is applied to said sleeve by metalizing.
Claim 7
Dependent Claim
19 words
A drill bit according to claim 1 wherein said metal coating comprises a plurality of layers of lubricating metal.
Claim 8
Dependent Claim
23 words
A drill bit according to claim 1 wherein said metal coating is at least one layer of silver, copper, tin, lead or indium.
Claim 9
Dependent Claim
32 words
A drill bit according to claim 1 wherein said metal coating includes at least one additional layer of metal coating, wherein said additional layer is of copper, silver, tin, lead or indium.
Claim 10
Dependent Claim
23 words
A drill bit according to claim 1 wherein said sleeve is of beryllium-copper alloy or a maraging steel alloy heat-treated to considerable hardness.
Claim 11
Dependent Claim
39 words
A drill bit according to claim 1 wherein there is provided between said sleeve, said journal, and said cutter, supplemental lubricating material comprising a grease containing metallic particles wherein said particles consist of indium, tin, lead, silver or copper.
Claim 12
Dependent Claim
70 words
A drill bit according to claim 1, including a lubrication system within said body and in communication with said bearing means, a lubricant grease having metallic particles dispersed therein wherein said metallic particles consist of silver or copper, and said lubricant grease being added to said lubrication system whereby the grease and particles are delivered to the areas of contact on said sleeve with said journal and said roller cutter.
Claim 13
Dependent Claim
13 words
A drill bit according to claim 9 wherein said metal coating is silver.
References Cited (Backward Citations)
US3990751A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-20 | 1981-08-22 | 1982-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-20 | 1985-08-22 | 1986-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-20 | 1989-08-22 | 1990-02-21 | $7700.00 | Window Closed / Lapsed |