US3865126A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid metering apparatus
Assignee: TH BAGGALEY Ltd
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Filing: 1973-11-26
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Granted: 1975-02-11
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Expires: 1993-11-26
Abstract
Abstract A system for supplying a liquid additive to a flow of liquid under pressure in a pipe uses a pump which is operated by the pressure of the liquid. The pump has two interconnected diaphragms which are both acted on by the liquid which is admitted by solenoid controlled valves and only one of the diaphragms serves to pump the additive. The pump thus pumps the additive at a greater pressure than that of the liquid in the pipe and hence enables the additive to be pumped into the liquid flowing in the pipe. The system preferably includes a rotary flow meter in the pipe which controls the solenoid valves of the pump to meter the proportion of additive pumped into the liquid accurately in dependence on the rate of flow of liquid through the pipe.
Inventors
- 👤 Thomas H Baggaley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:54
CPC Classifications
A; A01; A01C; A01C23/00; A01C23/04; A01C23/042; B; B01; B01F; B01F35/00; B01F35/80; B01F35/83; F; F04; F04B; F04B43/00; F04B43/02; F04B43/06; F04B43/073; F04B9/00; F04B9/08; F04B9/10; F04B9/103; F04B9/107; G; G05; G05D; G05D11/00; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2514; Y10T137/2516; Y10T137/2531
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
374 words
A system for supplying a liquid additive to a flow of liquid under pressure, such system comprising: 1. a pipe for carrying the flow of liquid under pressure; 2. a diaphragm pump including a first diaphragm having first and second faces, a pumping chamber bounded partly by said first face of said first diaphragm, a primary operating chamber bounded partly by said second face of said first diaphragm, a second diaphragm having first and second faces, a secondary operating chamber bounded partly by said first face of said second diaphragm, means for subjecting said second face of said second diaphragm to ambient pressure, and means connecting said first and said second diaphragms for movement thereof in unison; 3. means for communicating said pumping chamber with a supply of liquid additive, and first check valve means for preventing flow from said pumping chamber to said supply; 4. means communicating said pipe and said pumping chamber, and second a check valve means preventing flow from said pipe to said pumping chambers; 5. means communicating said first and said second operating chambers with said pipe, means for venting said first and said second operating chambers, solenoid valve means for controlling said pipe communicating means and said venting means of said first and second operating chambers, and a control device for operating said solenoid valve means cyclically whereby liquid under pressure is admitted from said pipe to said first and said second operating chambers when said venting means is closed and when said second face of said second diaphragm is subjected to ambient pressure, the force exerted on the said second diaphragm by said liquid under pressure in said second operating chamber combined with the force exerted on said first diaphragm by said liquid under pressure in said first operating chamber causing said diaphragms to move to pump additive in said pumping chamber into said pipe against the pressure of the liquid in said pipe, and means communicating said pipe to said first and said second operating chambers is then closed and said venting means opened to allow fresh additive to fill said pumping chamber; 6. and means for causing said diaphragms to move when said venting means opens whereby fresh additive is drawn into said pumping chamber.
Claim 2
Independent Claim
374 words
A system for supplying a liquid additive to a flow of liquid under pressure, such system comprising: 1. a pipe for carrying the flow of liquid under pressure; 2. a diaphragm pump including a first diaphragm having first and second faces, a pumping chamber bounded partly by said first face of said first diaphragm, a primary operating chamber bounded partly by said second face of said first diaphragm, a second diaphragm having first and second faces, a secondary operating chamber bounded partly by said first face of said second diaphragm, means for subjecting said second face of said second diaphragm to ambient pressure, and means connecting said first and said second diaphragms for movement thereof in unison; 3. means for communicating said pumping chamber with a supply of liquid additive, and first check valve means for preventing flow from said pumping chamber to said supply; 4. means communicating said pipe and said pumping chamber, and second a check valve means preventing flow from said pipe to said pumping chambers; 5. means communicating said first and said second operating chambers with said pipe, means for venting said first and said second operating chambers, solenoid valve means for controlling said pipe communicating means and said venting means of said first and second operating chambers, and a control device for operating said solenoid valve means cyclically whereby liquid under pressure is admitted from said pipe to said first and said second operating chambers when said venting means is closed and when said second face of said second diaphragm is subjected to ambient pressure, the force exerted on the said second diaphragm by said liquid under pressure in said second operating chamber combined with the force exerted on said first diaphragm by said liquid under pressure in said first operating chamber causing said diaphragms to move to pump additive in said pumping chamber into said pipe against the pressure of the liquid in said pipe, and means communicating said pipe to said first and said second operating chambers is then closed and said venting means opened to allow fresh additive to fill said pumping chamber; 6. and means for causing said diaphragms to move when said venting means opens whereby fresh additive is drawn into said pumping chamber.
Claim 3
Dependent Claim
88 words
a diaphragm pump including a first diaphragm having first and second faces, a pumping chamber bounded partly by said first face of said first diaphragm, a primary operating chamber bounded partly by said second face of said first diaphragm, a second diaphragm having first and second faces, a secondary operating chamber bounded partly by said first face of said second diaphragm, means for subjecting said second face of said second diaphragm to ambient pressure, and means connecting said first and said second diaphragms for movement thereof in unison;
Claim 4
Dependent Claim
88 words
a diaphragm pump including a first diaphragm having first and second faces, a pumping chamber bounded partly by said first face of said first diaphragm, a primary operating chamber bounded partly by said second face of said first diaphragm, a second diaphragm having first and second faces, a secondary operating chamber bounded partly by said first face of said second diaphragm, means for subjecting said second face of said second diaphragm to ambient pressure, and means connecting said first and said second diaphragms for movement thereof in unison;
Claim 5
Dependent Claim
68 words
The system of claim 1 wherein said control device comprises a rotary flow meter arranged in series with said pipe, a change-over switch, means operatively connecting said flow meter to said change-over switch, and electrical connecting means operatively connecting said changeover switch and said solenoid valve means whereby said solenoid valve means are operated cyclically in dependence on the rate of flow of said liquid through said pipe.
Claim 6
Dependent Claim
191 words
The system of claim 1 wherein said means for subjecting said second face of said second diaphragm to ambient pressure permanently exposes said second face to ambient pressure, and wherein said means communicating said first and second operating chambers with said pipe, said means for venting said first and second operating chambers and said solenoid valve means for controlling said pipe communicating means and said venting means comprise a first pipe means communicating said first and said second operating chambers, a second means communicating said second operating chamber and said pipe, a first solenoid valve controlling said second means, venting means communicating with said second operating chamber, and a second solenoid valve controlling said venting means, whereby said first solenoid valve is opened to admit liquid under pressure from said pipe into said second operating chamber and along said first pipe means to said first operating chamber when said second solenoid valve is closed, and then as said control device operates cyclically said first solenoid valve closes and said second solenoid valve opens to vent liquid from said operating chamber and through said first pipe means from said first operating chambeR.
Claim 7
Dependent Claim
27 words
means for communicating said pumping chamber with a supply of liquid additive, and first check valve means for preventing flow from said pumping chamber to said supply;
Claim 8
Dependent Claim
27 words
means for communicating said pumping chamber with a supply of liquid additive, and first check valve means for preventing flow from said pumping chamber to said supply;
Claim 9
Dependent Claim
23 words
means communicating said pipe and said pumping chamber, and second a check valve means preventing flow from said pipe to said pumping chambers;
Claim 10
Dependent Claim
23 words
means communicating said pipe and said pumping chamber, and second a check valve means preventing flow from said pipe to said pumping chambers;
Claim 11
Dependent Claim
208 words
The system of claim 1 wherein said diaphragm pump further includes a first, a second, a third, and a fourth saucer-shaped plate, said first and said second plates being clamped together with their concave faces toward one another with said first diaphragm between them, said third and said fourth plates being clamped together with their concave faces toward one another and with said second diaphragm between them, said first plate together with said first face of said first diaphragm bounding said pumping chamber, said second plate together with said second face of said first diaphragm bounding said primary operating chamber, said third plate including a vent and together with said first face of said second diaphragm bounding a space which is permanently vented to ambient pressure, said fourth plate together with said second face of said second diaphragm bounding said second operating chamber, and means mounting said first and said second plate and said third and said fourth plate coaxially; and wherein said means connecting said first and said second diaphragms is a rigid rod having one end fixed to the centre of said first diaphragm and the other end fixed to the centre of said second diaphragm, said rod passing through said second and said third plates.
Claim 12
Independent Claim
415 words
A system for supplying a liquid additive to a flow of liquid under pressure, said system comprising a pipe for containing said flow of liquid under pressure a diaphragm pump including a first diaphragm and a second diaphragm, means including one side of said first diaphragm bounding a pumping chamber, an inlet in communication with said pumping chamber, a non-return valve in said inlet, an outlet in communication with said pumping chamber, a non-return valve in said outlet, means including the other side of said first diaphragm bounding a primary operating chamber, a first passage communicating with said primary operating chamber, means including one side of said second diaphragm bounding a secondary operating chamber, a second passage communicating with said secondary operating chamber, communicating means for subjecting the other face of said second diaphragm to ambient pressure, and rigid means interconnecting said two diaphragms for movement in unison with each other, said system further comprising solenoid valve means operatively connected to said first and said second passages, means for communicating said inlet of said pumping chamber with an additive supply reservoir, said outlet of said pumping chamber communicating with said pipe, a first conduit communicating said pipe upstream from said outlet of said pumping chamber to said solenoid valve means, a vent outlet in communication with said solenoid valve means, a control device, and electrical connecting means connecting said control device to said solenoid valve means, said control device controlling the operation of said solenoid valve means to cause the admission of said liquid under pressure from said pipe through said first conduit, through said valve means through said first and said second passages into said primary and said secondary operating chambers to cause said first and said second diaphragms to move in unison to pump additive out of said pumping chamber through said outlet and into said flow of liquid in said pipe, said communicating means subjecting said outer face of said second diaphragm to ambient pressure whilst said additive is being pumped into said pipe, said control device subsequently controlling the operation of said valve means to cause the discharge of said liquid from said primary and said secondary operating chambers, through said first and said second passages through said valve means, and from said vent outlet to allow said first and said second diaphragms to return in unison to draw additive from said said stock reservoir through said inlet and into said pumping chamber under the influence of a return bias means.
Claim 13
Independent Claim
415 words
A system for supplying a liquid additive to a flow of liquid under pressure, said system comprising a pipe for containing said flow of liquid under pressure a diaphragm pump including a first diaphragm and a second diaphragm, means including one side of said first diaphragm bounding a pumping chamber, an inlet in communication with said pumping chamber, a non-return valve in said inlet, an outlet in communication with said pumping chamber, a non-return valve in said outlet, means including the other side of said first diaphragm bounding a primary operating chamber, a first passage communicating with said primary operating chamber, means including one side of said second diaphragm bounding a secondary operating chamber, a second passage communicating with said secondary operating chamber, communicating means for subjecting the other face of said second diaphragm to ambient pressure, and rigid means interconnecting said two diaphragms for movement in unison with each other, said system further comprising solenoid valve means operatively connected to said first and said second passages, means for communicating said inlet of said pumping chamber with an additive supply reservoir, said outlet of said pumping chamber communicating with said pipe, a first conduit communicating said pipe upstream from said outlet of said pumping chamber to said solenoid valve means, a vent outlet in communication with said solenoid valve means, a control device, and electrical connecting means connecting said control device to said solenoid valve means, said control device controlling the operation of said solenoid valve means to cause the admission of said liquid under pressure from said pipe through said first conduit, through said valve means through said first and said second passages into said primary and said secondary operating chambers to cause said first and said second diaphragms to move in unison to pump additive out of said pumping chamber through said outlet and into said flow of liquid in said pipe, said communicating means subjecting said outer face of said second diaphragm to ambient pressure whilst said additive is being pumped into said pipe, said control device subsequently controlling the operation of said valve means to cause the discharge of said liquid from said primary and said secondary operating chambers, through said first and said second passages through said valve means, and from said vent outlet to allow said first and said second diaphragms to return in unison to draw additive from said said stock reservoir through said inlet and into said pumping chamber under the influence of a return bias means.
Claim 14
Dependent Claim
181 words
means communicating said first and said second operating chambers with said pipe, means for venting said first and said second operating chambers, solenoid valve means for controlling said pipe communicating means and said venting means of said first and second operating chambers, and a control device for operating said solenoid valve means cyclically whereby liquid under pressure is admitted from said pipe to said first and said second operating chambers when said venting means is closed and when said second face of said second diaphragm is subjected to ambient pressure, the force exerted on the said second diaphragm by said liquid under pressure in said second operating chamber combined with the force exerted on said first diaphragm by said liquid under pressure in said first operating chamber causing said diaphragms to move to pump additive in said pumping chamber into said pipe against the pressure of the liquid in said pipe, and means communicating said pipe to said first and said second operating chambers is then closed and said venting means opened to allow fresh additive to fill said pumping chamber;
Claim 15
Dependent Claim
181 words
means communicating said first and said second operating chambers with said pipe, means for venting said first and said second operating chambers, solenoid valve means for controlling said pipe communicating means and said venting means of said first and second operating chambers, and a control device for operating said solenoid valve means cyclically whereby liquid under pressure is admitted from said pipe to said first and said second operating chambers when said venting means is closed and when said second face of said second diaphragm is subjected to ambient pressure, the force exerted on the said second diaphragm by said liquid under pressure in said second operating chamber combined with the force exerted on said first diaphragm by said liquid under pressure in said first operating chamber causing said diaphragms to move to pump additive in said pumping chamber into said pipe against the pressure of the liquid in said pipe, and means communicating said pipe to said first and said second operating chambers is then closed and said venting means opened to allow fresh additive to fill said pumping chamber;
Claim 16
Dependent Claim
22 words
and means for causing said diaphragms to move when said venting means opens whereby fresh additive is drawn into said pumping chamber.
Claim 17
Dependent Claim
22 words
and means for causing said diaphragms to move when said venting means opens whereby fresh additive is drawn into said pumping chamber.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |