US3841354A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow regulating device
Assignee: Individual
•
Filing: 1973-05-31
•
Granted: 1974-10-15
•
Expires: 1993-05-31
Abstract
Abstract A flow regulating device comprised of an internally threaded tubular member having an externally threaded pin screwed therein provides a helical capillary channel around the thread of the pin. The threads at the lower portions of the pin and tubular member are formed to allow variation of the cross-sectional area of the capillary channel on rotation of the pin in the tubular member.
Inventors
- 👤 R Mcdonnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:54
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/14; A61M5/168; A61M5/16877; A61M5/16881
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
313 words
A device for regulating the flow of a liquid which comprises a tubular body portion provided with an internal helical thread, said liquid being supplied at or towards one end of said body portion and being withdrawn at or towards the other end of said body portion; and a pin fitting within the tubular body portion and inserted in one end thereof, and being provided with an external helical thread cooperating with the said internal helical thread of the body portion such that rotation of the pin with respect to said body portion causes axial displacement of the pin within the body portion; said external helical thread on said pin having a first and a second end, the ridge of the external helical thread being removed to an increasing extent over at least part of the length thereof from said first to said second end such that said ridge is completely removed at said second end thereof, and said internal helical thread in said body portion having a first and a second end corresponding to said first and second ends of said external helical thread, the trough of the internal helical thread being filled to an increasing extent over at least part of the length thereof from said first to said second end such that said trough is completely filled at said second end thereof, the length of said internal helical thread over which the trough of the thread is filled to an increasing extent corresponding to the said length of said external helical thread over which the ridge of the thread is removed to an increasing extent such that the extent to which the trough of the internal helical thread is filled at any point on the length thereof corresponds with the extent to which the ridge of the external helical thread is removed at a corresponding point on the length thereof.
Claim 2
Independent Claim
313 words
A device for regulating the flow of a liquid which comprises a tubular body portion provided with an internal helical thread, said liquid being supplied at or towards one end of said body portion and being withdrawn at or towards the other end of said body portion; and a pin fitting within the tubular body portion and inserted in one end thereof, and being provided with an external helical thread cooperating with the said internal helical thread of the body portion such that rotation of the pin with respect to said body portion causes axial displacement of the pin within the body portion; said external helical thread on said pin having a first and a second end, the ridge of the external helical thread being removed to an increasing extent over at least part of the length thereof from said first to said second end such that said ridge is completely removed at said second end thereof, and said internal helical thread in said body portion having a first and a second end corresponding to said first and second ends of said external helical thread, the trough of the internal helical thread being filled to an increasing extent over at least part of the length thereof from said first to said second end such that said trough is completely filled at said second end thereof, the length of said internal helical thread over which the trough of the thread is filled to an increasing extent corresponding to the said length of said external helical thread over which the ridge of the thread is removed to an increasing extent such that the extent to which the trough of the internal helical thread is filled at any point on the length thereof corresponds with the extent to which the ridge of the external helical thread is removed at a corresponding point on the length thereof.
Claim 3
Dependent Claim
37 words
A device as claimed in claim 1, wherein the ridge of the external helical thread is removed to a constant extent over the remainder, if any, of the length thereof from said first to said second end.
Claim 4
Dependent Claim
45 words
A device as claimed in claim 1, wherein the rate at which the ridge of the external helical thread is removed to an increasing extent and at which the trough of the internal helical thread is filled to an increasing extent is a linear rate.
Claim 5
Dependent Claim
32 words
A device as claimed in claim 1, wherein the pin is provided with a shaft projecting beyond the body portion and sealing means are provided between said shaft and said body portion.
Claim 6
Dependent Claim
35 words
A device as claimed in claim 4, wherein said sealing means comprises one or more sealing rings which guide the shaft within the body portion while allowing both rotation and axial displacement of said shaft.
Claim 7
Dependent Claim
34 words
A device as claimed in claim 4, wherein a cap is provided on the end of said shaft remote from the external helical thread, said cap being of greater cross-sectional area than said shaft.
Claim 8
Dependent Claim
64 words
A device as claimed in claim 1, wherein the tubular body portion is provided with an outlet nozzle at one end thereof, said outlet nozzle being coaxial with said body portion, and an inlet nozzle is provided towards the other end of said body portion, said inlet nozzle being positioned in the side of said body portion and communicating with the tubular interior thereof.
Claim 9
Dependent Claim
26 words
A device as claimed in claim 7, wherein the internal helical thread extends within the body portion to the end thereof reMote from said outlet nozzle.
Claim 10
Dependent Claim
23 words
A device as claimed in claim 1, characterized in that said tubular body portion and said pin are made of a plastics material.
References Cited (Backward Citations)
US2323115A
Cited
US2568123A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |