US3744527A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulse damper unit for hydraulic system
Assignee: EXOL Inc A CORP OF DE
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Filing: 1972-07-13
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Granted: 1973-07-10
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Expires: 1992-07-13
Abstract
Abstract The present invention relates to a pulse damper unit for a hydraulic system and comprises a rigid container with two opposed ports, each having an associated tubular fitting defining an inlet and outlet respectively for connection of the unit to the hydraulic system. A flexible separator in the form of a bladder having two opposed ports, is positioned in the container defining an inner and outer chamber with said bladder ports being associated with and operatively connected to said fittings. A tube extending axially in said container, has its ends operatively connected to said tubular fittings, one end of said tube being rigidly secured to an associated fitting and the other end of the tube being slidably mounted with respect to an associated fitting. The tube defines a longitudinal passageway connecting said tubular fittings and has a permeable wall providing communication between said passageway and said inner chamber, a baffle adjustably mounted in said tube insuring that all of the hydraulic fluid entering the inlet fitting will flow through said permeable wall into said inner chamber before discharge from said outlet fitting. A third fitting is connected to a port leading into said container and in communication with said outer chamber, for charging of said outer chamber with fluid under pressure in order to dampen pulses in the hydraulic system.
Inventors
- 👤 J Mercier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:32
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/04; F16L55/045; F16L55/05; F16L55/052; F15; F15B; F15B1/00; F15B1/02; F15B1/04; F15B1/08; F15B1/10; F15B1/16; F16L55/053; F16L55/054; F15B2201/00; F15B2201/20; F15B2201/205; F15B2201/30; F15B2201/315; F15B2201/3152; F15B2201/3156; F15B2201/40; F15B2201/41; F15B2201/413; F15B2201/415
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
141 words
A pulse damper unit for a hydraulic system, comprising a rigid container having two axially aligned ports, an inlet fitting and an outlet fitting mounted respectively in said ports for connection of the unit into the hydraulic system, a tube in said container extending between said ports and interconnecting said fittings, said tube having a permeable wall, a deformable bladder in said container encompassing said tube and having two axially aligned ports associated respectively with said fittings, said bladder defining an inner and outer chamber in said container, means for charging said outer chamber with fluid under pressure, and a baffle positioned in said tube between said inlet and outlet fittings, whereby all of the hydraulic fluid entering said inlet fitting will flow through said permeable wall of said tube into said inner chamber before being discharged from said outlet fitting.
Claim 2
Dependent Claim
141 words
A pulse damper unit for a hydraulic system, comprising a rigid container having two axially aligned ports, an inlet fitting and an outlet fitting mounted respectively in said ports for connection of the unit into the hydraulic system, a tube in said container extending between said ports and interconnecting said fittings, said tube having a permeable wall, a deformable bladder in said container encompassing said tube and having two axially aligned ports associated respectively with said fittings, said bladder defining an inner and outer chamber in said container, means for charging said outer chamber with fluid under pressure, and a baffle positioned in said tube between said inlet and outlet fittings, whereby all of the hydraulic fluid entering said inlet fitting will flow through said permeable wall of said tube into said inner chamber before being discharged from said outlet fitting.
Claim 3
Dependent Claim
28 words
The combination set forth in claim 1 in which said baffle is axially movable in said tube and means are provided to retain said baffle in desired position.
Claim 4
Dependent Claim
63 words
The combination set forth in claim 1 in which said tube has a plurality of perforations therethrough along the length thereof, said baffle is a plug of diameter substantially the same as the inner diameter of said tube, said plug having a diaMetrical bore therethrough and a pin extends through said bore and through a pair of diametrically aligned perforations in said tube.
Claim 5
Dependent Claim
58 words
The combination set forth in claim 1 in which said tube has a plurality of perforations therethrough along the length thereof, and a stack of juxtaposed washers encompass said tube, each of said washers having a plurality of grooves in at least one surface thereof radiating from the axis thereof to the outer periphery, said grooves defining passageways.
Claim 6
Dependent Claim
40 words
The combination set forth in claim 1 in which one end of said tube is rigidly connected to one of said fittings and the other end of said tube is slidably mounted with respect to the other of said fittings.
Claim 7
Dependent Claim
50 words
The combination set forth in claim 1 in which each of said fittings is a hollow sleeve, a ring member is secured in each of the ports of said bladder, and a retainer sleeve releasably mounted in each of said fitting sleeves, clamps said ring members against said fitting sleeves.
Claim 8
Dependent Claim
58 words
The combination set forth in claim 1 in which each of said fittings is an internally threaded sleeve, said tube having an externally threaded portion at one end coacting with the threads of said fitting for secure connection thereto, the other end of said tube extending coaxially through said other fitting and being slidably mounted with respect thereto.
Claim 9
Dependent Claim
55 words
The combination set forth in claim 1 in which each of said fittings is a sleeve extending through an associated container port, means releasably locking said fittings in each of said container ports, an O-ring encompassing said fitting and positioned between said fitting and the wall of the associated port to define an annular seal.
Claim 10
Dependent Claim
170 words
The combination set forth in claim 1 in which each of said fittings is a sleeve extending through an associated container port, each of said sleeves having a radially extending flange at its inner end of outer diameter less than the diameter of the associated container port, a deformable locking ring encompassing each of said sleeves and interposed between the annular flange and periphery of the associated container port, said locking ring having an annular hub extending between the wall of the associated container port and the associated sleeve, a retainer ring encompassing each of said sleeves externally of said container port, said retainer ring having a reduced diameter portion defining an annular shoulder and an annular hub, said hub extending between the wall of the associated container port and the associated sleeve, the outer end of each sleeve being externally threaded and a nut screwed on said threaded end to lock said sleeve, said deformable ring and said retainer ring in fixed position with respect to the associated port.
Claim 11
Dependent Claim
62 words
The combination set forth in claim 9 in which an O-ring is positioned in said space, between the hub of said deformable locking ring and the hub of said retainer ring, said annular shoulder of said retainer ring having an annular groove and an O-ring positioned in said annular groove to engage the outer surface of said container coaxially with said port.
Claim 12
Dependent Claim
17 words
The combination set forth in claim 10 in which said hub of said retainer ring is bevelled.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |