Patent US3917028A successfully refreshed from Google Patents.
US3917028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lubrication reservoir assembly
Assignee: Smith International Inc
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Filing: 1975-01-13
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Granted: 1975-11-04
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Expires: 1995-01-13
Abstract
Abstract A drill bit construction with a lubrication system for the rotary cutter means thereof which includes a lubricant reservoir having lubricant in flow communication with the bearing area of said rotary cutter means, the lubricant reservoir having a permanent closure plug removably mounted within the entrance to the reservoir and a temporary closure plug removably mounted within the entrance to the reservoir in place of the permanent plug when the reservoir is filled with lubricant whereby when so filled and the permanent plug mounted in place of the temporary plug, an expansion space is provided between the lubricant in the reservoir and the inner side of the permanent plug.
Inventors
- 👤 Lloyd L Garner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:30
CPC Classifications
F; F16; F16C; F16C33/00; F16C33/30; F16C33/66; F16C33/6603; F16C33/6607; E; E21; E21B; E21B10/00; E21B10/08; E21B10/22; E21B10/24; F16C33/6622; F16C2352/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
113 words
In a lubrication system for earth boring tools wherein the body of the tool has a reservoir for a lubricant, a journal leg, a rotary cutter on said journal leg and defining therewith a lubrication space having a lubricant connection with said reservoir, an expansion device in said reservoir, a permanent removable closure plug for said reservoir extending a given distance into the reservoir, and a temporary closure plug for the reservoir in place of the permanent plug and extending into the reservoir a greater distance than the permanent plug so that when the permanent plug is substituted for the temporary plug the reservoir is provided with a lubricant product expansion space therein.
Claim 2
Dependent Claim
113 words
In a lubrication system for earth boring tools wherein the body of the tool has a reservoir for a lubricant, a journal leg, a rotary cutter on said journal leg and defining therewith a lubrication space having a lubricant connection with said reservoir, an expansion device in said reservoir, a permanent removable closure plug for said reservoir extending a given distance into the reservoir, and a temporary closure plug for the reservoir in place of the permanent plug and extending into the reservoir a greater distance than the permanent plug so that when the permanent plug is substituted for the temporary plug the reservoir is provided with a lubricant product expansion space therein.
Claim 3
Dependent Claim
21 words
The structure in claim 1, and said tool body having a filler opening therein communicating with the interior of said reservoir,
Claim 4
Dependent Claim
17 words
The structure in claim 2, and said filler opening having a pressure relief valve removably located therein.
Claim 5
Dependent Claim
37 words
The structure in claim 1, and said reservoir having an opening to the outside of the tool, said closure plugs being selectively insertable in said opening, and means for releasably retaining the closure plugs in said opening.
Claim 6
Dependent Claim
76 words
The structure in claim 1, and said reservoir having an opening to the outside of the tool, said opening having an outwardly facing shoulder therein spaced inwardly from the outside thereof, said permanent closure plug being receivable in said opening and adapted to engage said shoulder, and said temporary plug being insertable in said opening and adapted to engage said shoulder and extending into said opening beyond said shoulder a greater distance than said permanent plug.
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) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |