Patent US3596562A successfully refreshed from Google Patents.
US3596562A
Expired / Lapsed
US
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Transducer for converting fluid pressure oscillations into mechanical oscillations
Assignee: NAT RES DEV
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Filing: 1969-01-10
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Granted: 1971-08-03
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Expires: 1989-01-10
Abstract
Abstract A transducer for converting fluid pressure oscillations into mechanical oscillations comprising a piston member in a cylinder, the piston member and the cylinder being relatively movable, first and second opposing faces of the piston member being respectively disposed in first and second chambers in the cylinder, each chamber being adapted to contain fluid under pressure, and means for connecting at least the said first chamber to a respective source of oscillating pressure fluid to cause relative oscillating movement of the piston member and the cylinder, excessive relative movement of the piston member and the cylinder in one sense being limited by a snubber, the piston and cylinder being predisposed to relative movement in the opposite sense to a predetermined position by means including limited fluid flow between the first and second chambers, valve means being provided to vent the fluid from the second chamber to drain when the piston and cylinder are in said predetermined position.
Inventors
- 👤 Keith Foster
- 👤 John Duff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:49
CPC Classifications
B; B25; B25D; B25D9/00; B25D9/06; B06; B06B; B06B1/00; B06B1/18; B06B1/183; Y; Y10; Y10S; Y10S173/00; Y10S173/04
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
278 words
A transducer for converting fluid pressure oscillations into mechanical oscillations, comprising: a cylinder; a piston member in said cylinder; said piston member and said cylinder being adapted for relative movement; said cylinder having first and second chambers adapted to contain fluid under pressuRe; said piston member having first and second opposing faces disposed in said first and second chambers respectively; first means adapted to connect said first chamber to a source of oscillating pressure fluid to cause relative movement between said piston member and said cylinder in a first relative direction; second means associated with the second chamber to cause relative movement between said piston member and said cylinder in a second relative direction opposite to the first relative direction whereby said first and second means cause relative oscillating movement between said piston member and said cylinder; said cylinder including means in said second chamber defining a snubbing space adapted to contain fluid; said piston member including a portion adapted to enter said snubbing space and to compress fluid in said snubbing space upon excessive relative movement of said piston member and cylinder in one sense; means defining a restricted outlet from said snubbing space when said portion of said piston member has entered said snubbing space; means predisposing the piston member to creep in the second direction relative to the cylinder towards a predetermined position; said last mentioned means including means adapted to permit limited flow of fluid from said first chamber to said second chamber; and valve means operable upon relative movement of said piston member and cylinder to said predetermined position, to allow flow of fluid to a low pressure region from said second chamber.
Claim 2
Dependent Claim
278 words
A transducer for converting fluid pressure oscillations into mechanical oscillations, comprising: a cylinder; a piston member in said cylinder; said piston member and said cylinder being adapted for relative movement; said cylinder having first and second chambers adapted to contain fluid under pressuRe; said piston member having first and second opposing faces disposed in said first and second chambers respectively; first means adapted to connect said first chamber to a source of oscillating pressure fluid to cause relative movement between said piston member and said cylinder in a first relative direction; second means associated with the second chamber to cause relative movement between said piston member and said cylinder in a second relative direction opposite to the first relative direction whereby said first and second means cause relative oscillating movement between said piston member and said cylinder; said cylinder including means in said second chamber defining a snubbing space adapted to contain fluid; said piston member including a portion adapted to enter said snubbing space and to compress fluid in said snubbing space upon excessive relative movement of said piston member and cylinder in one sense; means defining a restricted outlet from said snubbing space when said portion of said piston member has entered said snubbing space; means predisposing the piston member to creep in the second direction relative to the cylinder towards a predetermined position; said last mentioned means including means adapted to permit limited flow of fluid from said first chamber to said second chamber; and valve means operable upon relative movement of said piston member and cylinder to said predetermined position, to allow flow of fluid to a low pressure region from said second chamber.
Claim 3
Dependent Claim
27 words
A transducer as claimed in claim 1 in which the restricted outlet comprises at least one narrow conduit extending from the snubbing space to the second chamber.
Claim 4
Dependent Claim
18 words
A transducer as claimed in claim 2 in which the or each narrow conduit is a narrow groove.
Claim 5
Dependent Claim
67 words
A transducer as claimed in claim 2 in which, upon initial said excessive relative movement, the at least one groove communicates with the snubbing space or the second chamber over a substantial fraction of its length, further excessive relative movement in the said one sense reducing the said fraction whereby the resistance afforded by the at least one groove to the flow of fluid therethrough is increased.
Claim 6
Dependent Claim
53 words
A transducer as claimed in claim 3 in which the piston member has a circumferential surface upon which the at least one groove is situated, the groove extending from the said second opposing face of the piston member towards the first opposing face for part of the axial length of the circumferential surface.
Claim 7
Dependent Claim
41 words
A transducer as claimed in claim 1 in which the average magnitude of the said limited flow of fluid per cycle of oscillation of the piston member is 5 percent to 20 percent of the swept volume of the first chamber.
Claim 8
Dependent Claim
23 words
A transducer as claimed in claim 6 wherein the said average magnitude is 5 percent to 10 percent of the said swept volume.
Claim 9
Dependent Claim
95 words
A transducer as claimed in claim 3 in which the valve means comprising a port in the wall of the cylinder, means connecting said port to the said low pressure region, the piston member having a circumferential surface upon which the at least one groove is situated, the groove extending from the said second opposing face of the piston member towards the first opposing face for part of the axial length of the circumferential surface, said at least one groove connecting said port to the second chamber upon said relative movement to said predetermined position.
Claim 10
Dependent Claim
91 words
A transducer as claimed in claim 8 in which when the piston member and the cylinder are in the said predetermined position, the at least one groove only communicates with the said port at its end remote from the said second face, further relative movement in the second direction causing the at least one groove to communicate with the said port at a part of its length nearer the said second face, reducing the resistance afforded by the at least one groove to the flow of fluid from the second chamber.
Claim 11
Dependent Claim
62 words
A transducer as claimed iN claim 1 in which the means to permit limited flow comprises a duct containing a valve which when in a first position, allows a relatively unlimited flow of fluid to pass from the first chamber to the second chamber, and when in the second position allows said limited flow from the first chamber to the second chamber.
Claim 12
Dependent Claim
39 words
Apparatus comprising a source of oscillating pressure fluid and a transducer as claimed in claim 1 the source of oscillating pressure fluid being connected to the said first chamber and a driven load being connected to the piston member.
Claim 13
Dependent Claim
33 words
Apparatus as claimed in claim 11 comprising a further source of oscillating pressure fluid connected to the second chamber, the further source of pressure fluid being in antiphase relationship with the first-mentioned source.
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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) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |