US3638499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for sampling fluid of hydraulic circuit
Assignee: Individual
•
Filing: 1969-05-13
•
Granted: 1972-02-01
•
Expires: 1989-05-13
Abstract
Abstract A device for taking samples of fluid from a hydraulic circuit while operating under pressure comprises a hollow body having a chamber which is connected into the circuit through a very small opening which is normally closed by a point at the end of a spring-pressed plunger slidable in the chamber and having near its point lateral channels leading into a central longitudinal channel through which the sample is discharged when the plunger is pulled down against its spring so as to open the opening. A controlled-leakage passage prevents accumulation of solid particles and keeps the device clean so that subsequent samplings are not contaminated.
Inventors
- 👤 Robert Saint-Andre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:10
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/02; G01N1/10; G01N1/28; G01N1/40; G01N1/4077; G01N2001/1031; G01N2001/105; Y; Y10; Y10S; Y10S251/00; Y10S251/903
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
201 words
A device for taking a sample of the fluid of a hydraulic circuit while operating under pressure which comprises a hollow body having a chamber communicating with said circuit by a small diameter orifice, a collar slidable in said chamber, a reciprocable plunger slidable in said collar and having at one end a point engageable in said orifice to close it, a central channel extending through said plunger to the opposite end of said plunger and at least one lateral channel opening from said central channel into said chamBer near said point, means for limiting movement of said collar in a direction away from said orifice, compression spring means surrounding said plunger and acting between said collar and said plunger for urging said plunger toward said orifice to close said orifice by said point, said spring means being calibrated normally to exert on said plunger a force greater than the force exerted on said plunger by the pressure fluid of said hydraulic circuit, said plunger being retractable against the force of said spring means to open said orifice and permit a sample of hydraulic fluid to flow through said channels and to be discharged from said opposite end of said plunger.
Claim 2
Independent Claim
201 words
A device for taking a sample of the fluid of a hydraulic circuit while operating under pressure which comprises a hollow body having a chamber communicating with said circuit by a small diameter orifice, a collar slidable in said chamber, a reciprocable plunger slidable in said collar and having at one end a point engageable in said orifice to close it, a central channel extending through said plunger to the opposite end of said plunger and at least one lateral channel opening from said central channel into said chamBer near said point, means for limiting movement of said collar in a direction away from said orifice, compression spring means surrounding said plunger and acting between said collar and said plunger for urging said plunger toward said orifice to close said orifice by said point, said spring means being calibrated normally to exert on said plunger a force greater than the force exerted on said plunger by the pressure fluid of said hydraulic circuit, said plunger being retractable against the force of said spring means to open said orifice and permit a sample of hydraulic fluid to flow through said channels and to be discharged from said opposite end of said plunger.
Claim 3
Dependent Claim
44 words
A sampling device according to claim 1, further comprising a cap screwed onto an end of said body opposite said orifice and engageable with said collar to move it toward said orifice and thereby increase the pressure exerted on said plunger by said spring.
Claim 4
Dependent Claim
32 words
A sampling device according to claim 1, in which said plunger conforms closely to the walls of said chamber so as to avoid excessive dead space in which solid particles can collect.
Claim 5
Dependent Claim
42 words
A sampling device according to claim 1, in which a removable cap closes an end of said hollow body opposite said orifice, and in which said cap includes means engageable with said plunger to retract said plunger and thereby open said orifice.
Claim 6
Dependent Claim
54 words
A sampling device according to claim 1, comprising a removable cap for closing an end of said hollow body opposite said orifice, said cap comprising means cooperating with said spring means to increase the force exerted by said spring means for urging said plunger toward said orifice when said cap is in closed position.
Claim 7
Independent Claim
230 words
A device for taking a sample of the fluid of a hydraulic circuit while operating under pressure which comprises a hollow body having a chamber communicating with said circuit by a small diameter orifice, a plunger reciprocable in said chamber and having at one end a point engageable in said orifice to close it, a central channel extending through said plunger to the opposite end of said plunger and at least one lateral channel opening from said central channel into said chamber near said point, spring means for urging said plunger toward said orifice to close said orifice by said point, said spring means being calibrated normally to exert on said plunger a force greater than the force exerted on said plunger by the pressure fluid of said hydraulic circuit, said plunger being retractable against the force of said spring means to open said orifice and permit a sample of hydraulic fluid to flow through said channels and to be discharged from said opposite end of said plunger, said plunger conforming closely to the walls of said chamber so as to avoid excessive dead space in which material can collect, said body being provided with a restricted leakage passage for conducting fluid from space between said plunger and the walls of said chamber to a discharge outlet to avoid retention in said space of fluid which might contaminate future samplings.
Claim 8
Independent Claim
230 words
A device for taking a sample of the fluid of a hydraulic circuit while operating under pressure which comprises a hollow body having a chamber communicating with said circuit by a small diameter orifice, a plunger reciprocable in said chamber and having at one end a point engageable in said orifice to close it, a central channel extending through said plunger to the opposite end of said plunger and at least one lateral channel opening from said central channel into said chamber near said point, spring means for urging said plunger toward said orifice to close said orifice by said point, said spring means being calibrated normally to exert on said plunger a force greater than the force exerted on said plunger by the pressure fluid of said hydraulic circuit, said plunger being retractable against the force of said spring means to open said orifice and permit a sample of hydraulic fluid to flow through said channels and to be discharged from said opposite end of said plunger, said plunger conforming closely to the walls of said chamber so as to avoid excessive dead space in which material can collect, said body being provided with a restricted leakage passage for conducting fluid from space between said plunger and the walls of said chamber to a discharge outlet to avoid retention in said space of fluid which might contaminate future samplings.
Claim 9
Dependent Claim
19 words
A sampling device according to claim 6, comprising valve means controlling the discharge of fluid through said leakage passage.
Claim 10
Dependent Claim
17 words
A sampling device according to claim 7, in which said valve means comprises a manually controlled valve.
Claim 11
Dependent Claim
16 words
A sampling device according to claim 8, in which said valve means comprises a pressure-responsive valve.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |