US3893487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High pressure hydraulic fitting
Assignee: Caterpillar Inc
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Filing: 1973-12-26
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Granted: 1975-07-08
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Expires: 1993-12-26
Abstract
Abstract A fitting for utilization in high pressure hydraulic systems including a threaded plug and housing having a threaded bore. The housing has a bevelled portion for mating engagement with a correspondingly bevelled surface on the threaded plug. Disposed within a groove upon the threaded plug is an elastomeric annular ''''O''''-ring seal. Upon pressurization of the hydraulic system, the threaded plug tends to move axially with respect to the threaded bore to create a gap between the respective bevelled surfaces of the housing and the plug, into which gap the elastomeric seal ring tends to extrude. For any given amount of axial movement of the threaded plug under pressure, the gap between the respective bevelled surfaces will be appreciably less with a consequent reduction in the tendency and extent of seal ring extrusion thereinto.
Inventors
- 👤 Frederick S Engelking
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:19
CPC Classifications
B; B65; B65D; B65D39/00; B65D39/08; F; F16; F16L; F16L55/00; F16L55/10; F16L55/11; F16L55/1108
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
200 words
A fitting assembly for a high pressure fluid system including; housing means for containing said high pressure fluid, said housing means including an axially extending bore, plug means for being received within said bore for selective closure thereof, seal means disposed between said plug means and said housing means for preventing egress of fluid from said bore when said plug means is positioned for closure thereof, said housing means including a first bevelled surface proximate said seal means and disposed at a first predetermined angle with respect to the axis of said bore, said plug means including a second bevelled surface proximate said seal means and disposed at said first predetermined angle with respect to said axis for abutting engagement with said first bevelled surface when said plug means is positioned for closure of said bore, said first predetermined angle being acute, said plug means including a plug member having an enlarged head portion and having a reduced section shank portion, said plug member further having a further reduced section annular groove thereon axially between said head portion and said shank portion, said seal means being disposed in said annular groove and not between said first and second bevelled surfaces.
Claim 2
Dependent Claim
200 words
A fitting assembly for a high pressure fluid system including; housing means for containing said high pressure fluid, said housing means including an axially extending bore, plug means for being received within said bore for selective closure thereof, seal means disposed between said plug means and said housing means for preventing egress of fluid from said bore when said plug means is positioned for closure thereof, said housing means including a first bevelled surface proximate said seal means and disposed at a first predetermined angle with respect to the axis of said bore, said plug means including a second bevelled surface proximate said seal means and disposed at said first predetermined angle with respect to said axis for abutting engagement with said first bevelled surface when said plug means is positioned for closure of said bore, said first predetermined angle being acute, said plug means including a plug member having an enlarged head portion and having a reduced section shank portion, said plug member further having a further reduced section annular groove thereon axially between said head portion and said shank portion, said seal means being disposed in said annular groove and not between said first and second bevelled surfaces.
Claim 3
Dependent Claim
31 words
The invention of claim 1 wherein said bore is cylindrical and wherein screw threads are provided in said bore and upon a portion of said plug means for mutual mating engagement.
Claim 4
Dependent Claim
21 words
The invention of claim 1 wherein said seal means include an elastomeric annular ring member operatively disposed in said annular groove.
Claim 5
Dependent Claim
50 words
The invention of claim 1 wherein said first bevelled surface forms a first frustum of a right circular cone having an apex on said axis of said bore having an angle of rotation equal to said first predetermined angle and wherein said second bevelled surface forms a second corresponding frustum.
Claim 6
Dependent Claim
15 words
The invention of claim 4 wherein said first predetermined angle is between 1* and 45*.
Claim 7
Dependent Claim
12 words
The invention of claim 5 wherein said first predetermined angle is 30*.
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) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |