US3663073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealed bearing earth boring bit
Assignee: Varel International Inc
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Filing: 1970-04-16
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Granted: 1972-05-16
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Expires: 1990-04-16
Abstract
Abstract A sealed bearing earth boring bit of the rolling cutter type in which a tapered first axially extending flange at the inner periphery of the annular seal is wedged in and bonded to a correspondingly tapered axially extending groove in the leg of the bit thereby positively fixedly securing the seal to the leg in a fluidly sealed relationship, and a method of making same. At the outer periphery of the seal, a second axially extending flange, which is resiliently urged against and in fluidly sealed engagement with the cutter, is provided with a plurality of radially extending cavities in fluid communication with the lubricant proximate the bearings to promote circulation of the lubricant, enchance cooling, and reduce friction and resulting wear of both the seal face and the mating surface of the cutter.
Inventors
- 👤 Charles L Bronson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:23
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/22; E21B10/25; F; F16; F16C; F16C33/00; F16C33/72; F16C33/76; F16C33/78; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/3436; F16J15/3456; F16C2352/00
Claims Analysis
Total Claims: 40
Claim 1
Independent Claim
125 words
In a sealed bearing earth boring bit comprising at least one leg having a first sealing surface and terminating in an integral shaft; a cutter rotatably mounted on said shaft and having a second sealing surface; at least one antifriction bearing disposed between said shaft and said cutter; means for supplying lubricant to said bearing; and seal means resiliently interposed between said leg and said cutter for effecting a fluid-tight seal therebetween at said first and second sealing surfaces, the improvement comprising: a portion of said seal means being wedged into a groove provided in one of the sealing surfaces, said groove being defined at least in part by a pair of generally opposed walls between which said portion of said seal means is wedged.
Claim 2
Dependent Claim
125 words
In a sealed bearing earth boring bit comprising at least one leg having a first sealing surface and terminating in an integral shaft; a cutter rotatably mounted on said shaft and having a second sealing surface; at least one antifriction bearing disposed between said shaft and said cutter; means for supplying lubricant to said bearing; and seal means resiliently interposed between said leg and said cutter for effecting a fluid-tight seal therebetween at said first and second sealing surfaces, the improvement comprising: a portion of said seal means being wedged into a groove provided in one of the sealing surfaces, said groove being defined at least in part by a pair of generally opposed walls between which said portion of said seal means is wedged.
Claim 3
Dependent Claim
16 words
The earth boring bit of claim 1 wherein said groove is tapered inwardly with increasing depth.
Claim 4
Dependent Claim
24 words
The earth boring bit of claim 2 wherein said portion of said seal means is tapered outwardly with increasing distance from the extremity thereof.
Claim 5
Dependent Claim
24 words
The earth boring bit of claim 3 wherein said groove and said portion of said seal means are tapered in a mutually mating fashion.
Claim 6
Dependent Claim
33 words
The earth boring bit of claim 4 wherein said portion of said seal means is sufficiently wide relative to the width of said groove to provide an end clearance therebetween when wedged therein.
Claim 7
Dependent Claim
24 words
The earth boring bit of claim 1 wherein said portion of said seal means is taped outwardly with increasing distance from the extremity thereof.
Claim 8
Dependent Claim
40 words
The earth boring bit of claim 1 wherein said seal means is provided with a plurality of cavities in fluid communication with the space proximate said bearing when said seal means is resiliently interposed between said leg and said cutter.
Claim 9
Dependent Claim
40 words
The earth boring bit of claim 4 wherein said seal means is provided with a plurality of cavities in fluid communication with the space proximate said bearing when said seal means is resiliently interposed between said leg and said cutter.
Claim 10
Dependent Claim
40 words
The earth boring bit of claim 5 wherein said seal means is provided with a plurality of cavities in fluid communication with the space proximate said bearing when said seal means is resiliently interposed between said leg and said cutter.
Claim 11
Dependent Claim
98 words
An earth boring bit, comprising: at least one leg terminating in an integral shaft, said leg being provided with a grove therearound, said groove being defined at least in part by a pair of generally opposes walls; a cutter rotatably mounted on said shaft; at least one antifriction bearing disposed between said shaft and said cutter; means for supplying lubricant to said bearing; and seal means resiliently interposed between said leg and said cutter for effecting a fluid-tight seal therebetween, a portion of said seal means being wedged into said groove between said pair of generally opposeD walls.
Claim 12
Dependent Claim
98 words
An earth boring bit, comprising: at least one leg terminating in an integral shaft, said leg being provided with a grove therearound, said groove being defined at least in part by a pair of generally opposes walls; a cutter rotatably mounted on said shaft; at least one antifriction bearing disposed between said shaft and said cutter; means for supplying lubricant to said bearing; and seal means resiliently interposed between said leg and said cutter for effecting a fluid-tight seal therebetween, a portion of said seal means being wedged into said groove between said pair of generally opposeD walls.
Claim 13
Dependent Claim
19 words
The earth boring bit of claim 10 wherein said groove in said leg is tapered inwardly with increasing depth.
Claim 14
Dependent Claim
24 words
The earth boring bit of claim 11 wherein said portion of said seal means is tapered outwardly with increasing distance from the extremity thereof.
Claim 15
Dependent Claim
24 words
The earth boring bit of claim 12 wherein said groove and said portion of said seal means are tapered in a mutually mating fashion.
Claim 16
Dependent Claim
33 words
The earth boring bit of claim 13 wherein said portion of said seal means is sufficiently wide relative to the width of said groove to provide an end clearance therebetween when wedged therein.
Claim 17
Dependent Claim
24 words
The earth boring bit of claim 10 wherein said portion of said seal means is tapered outwardly with increasing distance from the extremity thereof.
Claim 18
Dependent Claim
40 words
The earth boring bit of claim 10 wherein said seal means is provided with a plurality of cavities in fluid communication with the space proximate said bearing when said seal means is resiliently interposed between said leg and said cutter.
Claim 19
Dependent Claim
40 words
The earth boring bit of claim 13 wherein said seal means is provided with a plurality of cavities in fluid communication with the space proximate said bearing when said seal means is resiliently interposed between said leg and said cutter.
Claim 20
Dependent Claim
40 words
The earth boring bit of claim 14 wherein said seal means is provided with a plurality of cavities in fluid communication with the space proximate said bearing when said seal means is resiliently interposed between said leg and said cutter.
Claim 21
Dependent Claim
141 words
In a sealed bearing boring bit comprising at least one leg having a first sealing surface and terminating in an integral shaft; a cutter rotatably mounted on said shaft and having a second sealing surface; at least one antifriction bearing disposed between said shaft and said cutter; means for supplying lubricant to said hearing; and seal means resiliently interposed between said leg and said cutter for effecting a fluid-tight seal therebetween at said first and second sealing surfaces, the improvement comprising: a portion of said seal means being wedged into a groove provided in one of the sealing surfaces, said groove being defined at least in part by a pair of generally opposed walls between which said portion of said seal means is wedged, and said portion of said seal means being bonded to at least one wall of said groove.
Claim 22
Dependent Claim
141 words
In a sealed bearing boring bit comprising at least one leg having a first sealing surface and terminating in an integral shaft; a cutter rotatably mounted on said shaft and having a second sealing surface; at least one antifriction bearing disposed between said shaft and said cutter; means for supplying lubricant to said hearing; and seal means resiliently interposed between said leg and said cutter for effecting a fluid-tight seal therebetween at said first and second sealing surfaces, the improvement comprising: a portion of said seal means being wedged into a groove provided in one of the sealing surfaces, said groove being defined at least in part by a pair of generally opposed walls between which said portion of said seal means is wedged, and said portion of said seal means being bonded to at least one wall of said groove.
Claim 23
Dependent Claim
16 words
The earth boring bit of claim 19 wherein said groove is tapered inwardly with increasing depth.
Claim 24
Dependent Claim
24 words
The earth boring bit of claim 20 wherein said portion of said seal means is tapered outwardly with increasing distance from the extremity thereof.
Claim 25
Dependent Claim
24 words
The earth boring bit of claim 21 wherein said groove and said portion of said seal means are tapered in a mutually mating fashion.
Claim 26
Dependent Claim
33 words
The earth boring bit of claim 22 wherein said portion of said seal means is sufficiently wide relative to the width of said groove to provide an end clearance therebetween when wedged therein.
Claim 27
Dependent Claim
24 words
The earth boring bit of claim 19 wherein said portion of said seal means is tapered outwardly with increasing distance from the extremity thereof.
Claim 28
Dependent Claim
40 words
The earth boring bit of claim 19 wherein said seal means is provided with a plurality of cavities in fluid communication with the space proximate said bearing when said seal means is resiliently interposed between said leg and said cutter.
Claim 29
Dependent Claim
40 words
The earth boring bit of claim 22 wherein said seal means is provided with a plurality of cavities in fluid communication with the space proximate said bearing when said seal means is resiliently interposed between said leg and said cutter.
Claim 30
Dependent Claim
40 words
The earth boring bit of claim 23 wherein said seal means is provided with a plurality of cavities in fluid communication with the space proximate said bearing when said seal means is resiliently interposed between said leg and said cutter.
Claim 31
Dependent Claim
104 words
An earth boring bit, comprising: at least one leg terminating in an integral shaft, said leg being provided with a groove therearound, said groove being defined at least in part by a pAir of generally opposed walls; a cutter rotatably mounted on said shaft; at least one antifriction bearing disposed between said shaft and said cutter; means for supplying lubricant to said bearing; and seal means resiliently interposed between said leg and said cutter for effecting a fluid-tight seal therebetween, a portion of said seal means being wedged into said groove between said pair of generally opposed walls and bonded to said leg thereat.
Claim 32
Dependent Claim
104 words
An earth boring bit, comprising: at least one leg terminating in an integral shaft, said leg being provided with a groove therearound, said groove being defined at least in part by a pAir of generally opposed walls; a cutter rotatably mounted on said shaft; at least one antifriction bearing disposed between said shaft and said cutter; means for supplying lubricant to said bearing; and seal means resiliently interposed between said leg and said cutter for effecting a fluid-tight seal therebetween, a portion of said seal means being wedged into said groove between said pair of generally opposed walls and bonded to said leg thereat.
Claim 33
Dependent Claim
19 words
The earth boring bit of claim 28 wherein said groove in said leg is tapered inwardly with increasing depth.
Claim 34
Dependent Claim
24 words
The earth boring bit of claim 29 wherein said portion of said seal means is tapered outwardly with increasing distance from the extremity thereof.
Claim 35
Dependent Claim
24 words
The earth boring bit of claim 30 wherein said groove and said portion of said seal means are tapered in a mutually mating fashion.
Claim 36
Dependent Claim
33 words
The earth boring bit of claim 31 wherein said portion of said seal means is sufficiently wide relative to the width of said groove to provide an end clearance therebetween when wedged therein.
Claim 37
Dependent Claim
24 words
The earth boring bit of claim 28 wherein said portion of said seal means is tapered outwardly with increasing distance from the extremity thereof.
Claim 38
Dependent Claim
40 words
The earth boring bit of claim 28 wherein said seal means is provided with a plurality of cavities in fluid communication with the space proximate said bearing when said seal means is resiliently interposed between said leg and said cutter.
Claim 39
Dependent Claim
40 words
The earth boring bit of claim 31 wherein said seal means is provided with a plurality of cavities in fluid communication with the space proximate said bearing when said seal means is resiliently interposed between said leg and said cutter.
Claim 40
Dependent Claim
40 words
The earth boring bit of claim 32 wherein said seal means is provided with a plurality of cavities in fluid communication with the space proximate said bearing when said seal means is resiliently interposed between said leg and said cutter.
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |