US3738531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid pumping system
Assignee: Bennett Pump Inc
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Filing: 1971-02-10
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Granted: 1973-06-12
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Expires: 1991-02-10
Abstract
Abstract A control system for the dispensing of gasoline includes leak detector means disposed in the main supply line, and a switch means responsive to the attitude of the leak detector means and operative to control the discharge of fluid from the dispenser nozzle valve. By this arrangement, the switch means insures that the leak detector means is in its fully opened position, prior to discharge of fluid from the dispenser nozzle valve.
Inventors
- 👤 T Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:13
CPC Classifications
B; B67; B67D; B67D7/00; B67D7/06; B67D7/32; B67D7/3209; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86485
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
172 words
A system for controlling the dispensing of fluid from a fluid supply line in which fluid is intermittently delivered under pressure and wherein the supply line pressure can vary over a wide range between a low pressure and a relatively higher delivery pressure comprising: a source of supply of pressurized fluid; a supply line connected to said source of supply at one end and fluid dispensing means at its opposite end; leak detector valve means provided in said supply line, which leak detector valve means is operative to temporarily prevent free flow to the supply line when the differential between the supply line pressure and the delivery pressure from the source of supply is more than a pre-selected amount; and switch means operative in response to the operational position of said leak detector valve means to prevent flow of fluid through said fluid dispensing means until the differential pressure between the supply line pressure and the delivery pressure from the source of supply is equal to or less than said pre-selected amount.
Claim 2
Independent Claim
172 words
A system for controlling the dispensing of fluid from a fluid supply line in which fluid is intermittently delivered under pressure and wherein the supply line pressure can vary over a wide range between a low pressure and a relatively higher delivery pressure comprising: a source of supply of pressurized fluid; a supply line connected to said source of supply at one end and fluid dispensing means at its opposite end; leak detector valve means provided in said supply line, which leak detector valve means is operative to temporarily prevent free flow to the supply line when the differential between the supply line pressure and the delivery pressure from the source of supply is more than a pre-selected amount; and switch means operative in response to the operational position of said leak detector valve means to prevent flow of fluid through said fluid dispensing means until the differential pressure between the supply line pressure and the delivery pressure from the source of supply is equal to or less than said pre-selected amount.
Claim 3
Dependent Claim
27 words
A system as in claim 1 wherein a check valve is provided in the supply line between the source of supply and the leak detector valve means.
Claim 4
Dependent Claim
25 words
A system as in claim 1 whereIn the fluid dispensing means includes a main valve and filter assembly, a delivery hose and a dispenser nozzle.
Claim 5
Dependent Claim
16 words
A system as in claim 1 wherein the switch means comprises a fluid pressure responsive switch.
Claim 6
Dependent Claim
27 words
A system as in claim 1 wherein the switch means comprises a mechanical switch operative in response to the operational position of the leak detector valve means.
Claim 7
Dependent Claim
25 words
A system as in claim 1 wherein a plurality of fluid dispensing means are provided, each fluid dispensing means being connected to said supply line.
Claim 8
Dependent Claim
72 words
A liquid pumping system as in claim 1 wherein said switch means comprises a fluid pressure responsive switch having a tubular housing having slideably mounted therein a spring biased plunger, said plunger operatively connected to a flexible diaphragm, said flexible diaphragm and tubular housing defining a chamber for receiving pressurized fluid from said supply line, the opposite end of said moveable plunger activating an electrical switch for controlling said fluid dispensing means.
Claim 9
Dependent Claim
155 words
A liquid pumping system including a storage tank, a least one remote delivery outlet, a supply line extending from the tank to the delivery outlet, a pump at said tank, means including a selectively actuatable control switch for controlling operation of said pump, a first valve means in said supply line adjacent said outlet, a second valve means in said supply line adjacent said tank, leak detector valve means in said supply line intermediate said first and second valve means and operative to prevent the free flow of fluid from the tank to the delivery outlet when the differential in the pressure in the supply line upstream and downstream of the leak detector valve is more than a predetermined amount, and means responsive to the leak detector valve means for controlling said first valve, whereby said first valve is maintained in its closed position until the leak detector valve means has assumed a pre-determined position.
Claim 10
Dependent Claim
155 words
A liquid pumping system including a storage tank, a least one remote delivery outlet, a supply line extending from the tank to the delivery outlet, a pump at said tank, means including a selectively actuatable control switch for controlling operation of said pump, a first valve means in said supply line adjacent said outlet, a second valve means in said supply line adjacent said tank, leak detector valve means in said supply line intermediate said first and second valve means and operative to prevent the free flow of fluid from the tank to the delivery outlet when the differential in the pressure in the supply line upstream and downstream of the leak detector valve is more than a predetermined amount, and means responsive to the leak detector valve means for controlling said first valve, whereby said first valve is maintained in its closed position until the leak detector valve means has assumed a pre-determined position.
Claim 11
Dependent Claim
31 words
A liquid pumping system as in claim 8 wherein said second valve comprises a check valve for trapping the liquid in the supply line between said first and second valve means.
Claim 12
Dependent Claim
26 words
A liquid pumping system as in claim 8 wherein a plurality of remote delivery outlets are provided, each of which is connected to said supply line.
References Cited (Backward Citations)
US2880909A
Cited
US2997207A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |