Patent US3583158A successfully refreshed from Google Patents.
US3583158A
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: 1971-06-08
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Expires: 1989-01-10
Abstract
Abstract A transducer for converting fluid pressure oscillations into mechanical oscillations comprising a piston member moveable in a cylinder, first and second opposing faces of the piston member being disposed in first and second chambers of the cylinder, both chambers being adapted to contain pressure fluid, means to connect at least the first chamber to a source of oscillating pressure fluid to cause the piston member to oscillate relatively to the cylinder, and cooling means to permit a restricted flow of pressure fluid sequentially through one said chamber and then through the other said chamber to a relatively low pressure region, whereby to cool the transducer.
Inventors
- 👤 Keith Foster
- 👤 John Fredericton Duff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:48
CPC Classifications
B; B25; B25D; B25D9/00; B25D9/06; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
220 words
A transducer for converting hydraulic fluid pressure oscillations into mechanical oscillations comprising: a cylinder member; a piston member having first and second opposing faces and moveable within said cylinder member; said cylinder member having first and second chambers adapted to contain hydraulic fluid under pressure; said first and second opposing faces of said piston member bounding in part said first and second chambers, respectively, of said cylinder member; first means adapted to connect said first chamber to a source of oscillating pressure hydraulic fluid for causing relative movement between said piston member and said cylinder member in a first relative direction; second means associated with the second chamber to cause relative movement between said piston member and said cylinder member 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 member; means predisposing the piston member to creep in the second direction relative to the cylinder member towards a predetermined position; said last-mentioned means including means adapted to permit limited flow of hydraulic fluid from said first chamber to said second chamber; valve means operable upon relative movement of said piston member and cylinder to said predetermined position for permitting flow of fluid to a low pressure region from said second chamber.
Claim 2
Dependent Claim
220 words
A transducer for converting hydraulic fluid pressure oscillations into mechanical oscillations comprising: a cylinder member; a piston member having first and second opposing faces and moveable within said cylinder member; said cylinder member having first and second chambers adapted to contain hydraulic fluid under pressure; said first and second opposing faces of said piston member bounding in part said first and second chambers, respectively, of said cylinder member; first means adapted to connect said first chamber to a source of oscillating pressure hydraulic fluid for causing relative movement between said piston member and said cylinder member in a first relative direction; second means associated with the second chamber to cause relative movement between said piston member and said cylinder member 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 member; means predisposing the piston member to creep in the second direction relative to the cylinder member towards a predetermined position; said last-mentioned means including means adapted to permit limited flow of hydraulic fluid from said first chamber to said second chamber; valve means operable upon relative movement of said piston member and cylinder to said predetermined position for permitting flow of fluid to a low pressure region from said second chamber.
Claim 3
Dependent Claim
56 words
A transducer as in claim 1 wherein the valve means comprises: a port in a wall of said cylinder member, means connecting said port to said low pressure region, and a longitudinally extending groove connecting said port to the second chamber when the piston member has moved relative to said cylinder member to said predetermined position.
Claim 4
Dependent Claim
89 words
A transducer as in claim 1 wherein the means adapted to permit limited flow of hydraulic fluid from said first chamber to said second chamber includes a flow passage containing a valve which is an open position allows a relatively unrestricted flow of fluid to pass from the first chamber to the second chamber to stop relative oscillating movement between the piston member and the cylinder member, and when in the second position allows only said limited flow of hydraulic fluid from the first chamber to the second chamber.
Claim 5
Dependent Claim
72 words
A transducer as in claim 1 further comprising: a conduit adapted to contain hydraulic pressure fluid and communicating with said first chamber, a regulator valve disposed in the conduit and adapted to maintain the pressure of the fluid in the said first chamber, and control valve means to supply pressure fluid from the conduit to the second chamber when the piston member moves excessively towards that chamber thus resisting such excessive movement.
Claim 6
Dependent Claim
16 words
A transducer as claimed in claim 4 wherein a pressure accumulator is provided in the conduit.
Claim 7
Dependent Claim
46 words
A transducer as claimed in claim 4 wherein the control valve means comprises a port in the wall of the cylinder member which communicates with the conduit, and a drilling or groove in the piston member which communicates with the port when said excessive movement occurs.
Claim 8
Dependent Claim
36 words
Apparatus comprising a source of oscillating pressure hydraulic fluid and a transducer as in claim 1, the source of oscillating pressUre fluid being connected to the said first chamber and the piston member driving a load.
Claim 9
Dependent Claim
39 words
A transducer as in claim 1 wherein the means adapted to permit limited flow of hydraulic fluid from said first chamber to said second chamber comprise a nonreturn valve permitting flow only from the first to the second chamber.
Claim 10
Dependent Claim
168 words
A transducer for converting hydraulic fluid pressure oscillations into mechanical oscillations comprising: a cylinder member, a piston member having first and second opposing faces and moveable within said cylinder, said cylinder member having first and second chambers with said first and second opposing faces of the piston member bounding said first and second chambers, means for connecting the first chamber to a source of oscillating pressure fluid for urging said piston member towards the second chamber in a first stroke directed in a first direction said second camber being effective to contain pressure fluid for urging the piston member towards the first chamber in a second stroke directed in a second direction opposite to said first direction vent means for venting pressure fluid from said second chamber to a low pressure region upon excessive movement of the piston during said second stroke, and a restricted flow passage between said first and second chambers for permitting a restricted flow therebetween to substantially replenish fluid vented by said vent means.
Claim 11
Dependent Claim
168 words
A transducer for converting hydraulic fluid pressure oscillations into mechanical oscillations comprising: a cylinder member, a piston member having first and second opposing faces and moveable within said cylinder, said cylinder member having first and second chambers with said first and second opposing faces of the piston member bounding said first and second chambers, means for connecting the first chamber to a source of oscillating pressure fluid for urging said piston member towards the second chamber in a first stroke directed in a first direction said second camber being effective to contain pressure fluid for urging the piston member towards the first chamber in a second stroke directed in a second direction opposite to said first direction vent means for venting pressure fluid from said second chamber to a low pressure region upon excessive movement of the piston during said second stroke, and a restricted flow passage between said first and second chambers for permitting a restricted flow therebetween to substantially replenish fluid vented by said vent means.
Claim 12
Dependent Claim
154 words
A transducer for converting hydraulic fluid pressure oscillations comprising: a piston member moveable in a cylinder, the cylinder having first and second chambers, first and second opposing faces of the piston member bounding said first and second chambers of the cylinder, means connecting the first chamber to a source of oscillating pressure fluid to urge the piston member towards the second chamber in a first stroke, the second chamber containing pressure fluid which urges the piston member towards the first chamber in a second stroke, the second chamber being substantially full of pressure fluid throughout the said first and second strokes, vent means for venting pressure fluid to a low pressure region from the second chamber upon excessive movement of the piston during said second stroke, and a restricted but permanently open flow passage between the first and second chambers, permitting a restricted flow therebetween to substantially replenish fluid vented by said vent means.
Claim 13
Dependent Claim
154 words
A transducer for converting hydraulic fluid pressure oscillations comprising: a piston member moveable in a cylinder, the cylinder having first and second chambers, first and second opposing faces of the piston member bounding said first and second chambers of the cylinder, means connecting the first chamber to a source of oscillating pressure fluid to urge the piston member towards the second chamber in a first stroke, the second chamber containing pressure fluid which urges the piston member towards the first chamber in a second stroke, the second chamber being substantially full of pressure fluid throughout the said first and second strokes, vent means for venting pressure fluid to a low pressure region from the second chamber upon excessive movement of the piston during said second stroke, and a restricted but permanently open flow passage between the first and second chambers, permitting a restricted flow therebetween to substantially replenish fluid vented by said vent means.
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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) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |