US3566915A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic system using concentric lines
Assignee: Boeing North American Inc
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Filing: 1969-05-05
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Granted: 1971-03-02
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Expires: 1989-05-05
Abstract
Abstract The pressure hose of a hydraulic system is enclosed within the return hose and connected by a hydraulic fitting to the mechanical system being operated by the hydraulic fluid passing through the hoses.
Inventors
- 👤 Willis D Griffin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:57
CPC Classifications
F; F16; F16L; F16L39/00; F16L39/02; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/85938
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
177 words
A system for coupling hydraulic lines to and from a fluid utilization device, said system comprising: coaxial fluid lines arranged one inside of another with the inside fluid line conducting fluid having a relatively higher pressure than the fluid in the outer fluid line; a hydraulic fitting including an outer manifold section having an inner diameter for mating with the outer diameter of the outer line, and a hydraulic joint inside said fitting for coupling with the inner line; and said hydraulic fitting including a stem section connecting said hydraulic fitting to a fluid utilization device, said stem section enclosing an extension plug having a central channel and an orifice for conducting fluid from said inner fluid line to said fluid utilization device, said extension plug having a flange about its circumference including openings for permitting fluid to flow from the reservoir of said fluid utilization device into said outer fluid line, said flange mating inside said stem section for preventing said fluid from flowing into said outer fluid line except through the openings of said flange.
Claim 2
Independent Claim
177 words
A system for coupling hydraulic lines to and from a fluid utilization device, said system comprising: coaxial fluid lines arranged one inside of another with the inside fluid line conducting fluid having a relatively higher pressure than the fluid in the outer fluid line; a hydraulic fitting including an outer manifold section having an inner diameter for mating with the outer diameter of the outer line, and a hydraulic joint inside said fitting for coupling with the inner line; and said hydraulic fitting including a stem section connecting said hydraulic fitting to a fluid utilization device, said stem section enclosing an extension plug having a central channel and an orifice for conducting fluid from said inner fluid line to said fluid utilization device, said extension plug having a flange about its circumference including openings for permitting fluid to flow from the reservoir of said fluid utilization device into said outer fluid line, said flange mating inside said stem section for preventing said fluid from flowing into said outer fluid line except through the openings of said flange.
Claim 3
Dependent Claim
32 words
The hydraulic system recited in claim 1 wherein said hydraulic fitting is a T-fitting for accommodating additional coaxial fluid lines for conducting fluid to and from a plurality of fluid utilization devices.
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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |