US3656764A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill bit seal assembly
Assignee: Individual
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Filing: 1970-08-31
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Granted: 1972-04-18
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Expires: 1990-08-31
Abstract
Abstract An earth boring drill bit employing roller cutters is provided with an improved seal for inhibiting ingress of abrasive materials into the bearing surfaces and egress of lubricant. The improved seal is between an outwardly facing re-entrant corner on the journal and an inwardly facing re-entrant corner on the cutter. The seal is made by a pair of O-rings engaging the opposed re-entrant corners and separated by a floating rigid ring having opposed bearing surfaces for seating the O-rings into the corners. This seal accommodates radial, axial, and angular displacements of almost twice the magnitude that can be accommodated by a single O-ring of the size of one of the O-rings without significantly increasing the length of journal needed for the seal.
Inventors
- 👤 William P Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:40
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/22; E21B10/25; F; F16; F16C; F16C21/00; F16C33/00; F16C33/72; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/3436; F16J15/3456; F16C2352/00
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
96 words
A rotary seal comprising: a first member having a first substantially flat face and an outwardly facing cylindrical face; a second member cooperating with the first member and having a second flat face opposite the first flat face and an inwardly directed cylindrical face opposite the outwardly directly cylindrical face; a first compressible seal ring having a portion in engagement with the outer cylindrical face; a second compressible seal ring having a portion in engagement with the inner cylindrical face; and a rigid floating ring between and in engagement with the first and second seal rings.
Claim 2
Dependent Claim
96 words
A rotary seal comprising: a first member having a first substantially flat face and an outwardly facing cylindrical face; a second member cooperating with the first member and having a second flat face opposite the first flat face and an inwardly directed cylindrical face opposite the outwardly directly cylindrical face; a first compressible seal ring having a portion in engagement with the outer cylindrical face; a second compressible seal ring having a portion in engagement with the inner cylindrical face; and a rigid floating ring between and in engagement with the first and second seal rings.
Claim 3
Dependent Claim
50 words
A rotary seal as defined in claim 1 wherein the first flat face and the second flat face are spaced apart by a distance greater than the cross section of the seal rings so that each of the seal rings is in engagement with no more than one flat face.
Claim 4
Dependent Claim
39 words
A rotary seal as defined in claim 1 wherein the rigid ring comprises: a cylindrical section between the first and second seal rings and a flange portion transverse to the cylindrical portion and adjacent one of the seal rings.
Claim 5
Dependent Claim
27 words
A rotary seal as defined in claim 3 wherein the rigid ring has an L-shaped cross section with the flange portion extending inwardly from the cylindrical portion.
Claim 6
Dependent Claim
56 words
A rotary seal as defined in claim 4 wherein the first flat face further comprises a recessed portion recessed from the flat face a distance approximately the same as the thickness of the flange portion of the L-shaped rigid ring so that both seal rings have substantially the same clearance from the first and second faces.
Claim 7
Dependent Claim
41 words
A rotary seal as defined in claim 3 wherein the rigid ring has a generally S-shaped cross section with a second flange portion extending transverse to the cylindrical portion and in an opposite direction therefrom from the first mentioned flange portion.
Claim 8
Dependent Claim
35 words
A rotary seal as defined in claim 1 wherein the rigid ring has a generally S-shaped cross section, the first and second rings being accommodated in the respective opposed crooks of the S-shaped rigid ring.
Claim 9
Dependent Claim
57 words
A seal as defined in claim 7 wherein a first crook of the generally S-shaped cross section of the rigid ring faces diagonally outwardly from the rigid ring and the other crook of the S-shaped cross section of the rigid ring faces diagonally inwardly from the rigid ring in substantially the opposite direction from the first crook.
Claim 10
Dependent Claim
67 words
A seal for a pair of relatively rotatable parts comprising: a first elastomeric compressible ring bearing on one rotatable part; a second elastomeric compressIble ring bearing on the other rotatable part; and a rigid floating ring having a generally S-shaped cross section between the first ring and the second ring, the first and second rings being accommodated in the respective opposed crooks of the S-shaped rigid ring.
Claim 11
Dependent Claim
67 words
A seal for a pair of relatively rotatable parts comprising: a first elastomeric compressible ring bearing on one rotatable part; a second elastomeric compressIble ring bearing on the other rotatable part; and a rigid floating ring having a generally S-shaped cross section between the first ring and the second ring, the first and second rings being accommodated in the respective opposed crooks of the S-shaped rigid ring.
Claim 12
Dependent Claim
57 words
A seal as defined in claim 9 wherein a first crook of the generally S-shaped cross section of the rigid ring faces diagonally outwardly from the rigid ring and the other crook of the S-shaped cross section of the rigid ring faces diagonally inwardly from the rigid ring in substantially the opposite direction from the first crook.
Claim 13
Dependent Claim
65 words
A seal as defined in claim 8 wherein a first crook of the S-shaped cross section of the rigid ring faces one face of the rigid ring and the second crook of the S-shaped cross section of the rigid ring faces the other face of the rigid ring; and wherein the first crook is radially further from the ring center than the second crook is.
Claim 14
Dependent Claim
82 words
A seal as defined in claim 9 wherein a first crook of the S-shaped cross section of the rigid ring faces radially outwardly from the rigid ring and a second crook of the S-shaped cross section rigid ring faces radially inwardly from the rigid ring, and wherein the first compressible ring is in a plane parallel to the plane of the second compressible ring and is displaced from the second compressible ring in a direction normal to the plane of the rings.
Claim 15
Dependent Claim
74 words
A seal for a pair of relatively rotatable parts comprising: a first elastomeric compressible ring bearing on one rotatable part; a second elastomeric compressible ring bearing on the other rotatable part; and a rigid floating ring between the first ring and the second ring, the rigid ring comprising a diagonally inwardly facing recessed portion on one face of the ring and adjacent the inner perimeter of the ring for accommodating the first compressible ring.
Claim 16
Dependent Claim
74 words
A seal for a pair of relatively rotatable parts comprising: a first elastomeric compressible ring bearing on one rotatable part; a second elastomeric compressible ring bearing on the other rotatable part; and a rigid floating ring between the first ring and the second ring, the rigid ring comprising a diagonally inwardly facing recessed portion on one face of the ring and adjacent the inner perimeter of the ring for accommodating the first compressible ring.
Claim 17
Dependent Claim
38 words
A seal as defined in claim 13 wherein the rigid ring further comprises a second diagonally outwardly facing recessed portion on the opposite face of the ring and adjacent the outer perimeter for accommodating the second compressible ring.
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) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |