F0RM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
The Patents Rules, 2003
PROVISIONAL SPECIFICATION
(See section 10; rule 13)

L Title of the invention. -

SIGHT FLOW INDICATOR SYSTEM WITH SPINNER ASSEMBLY

2. Applicant(s)
(a) NAME :
(b) NATIONALITY :
(c) ADDRESS :

LARSEN & TOUBRO LIMITED
An Indian company
L & T House, Ballard Estate, Mumbai 400 001, State of Maharashtra, India

3. PREAMBLE TO THE DESCRIPTION
The following specification describes the invention


TITLE OF THE INVENTION
SIGHT FLOW INDICATOR SYSTEM WITH SPINNER ASSEMBLY
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a sight flow indicator system for use in fuel dispensers. The invention particularly concerns a sight flow indicator system comprising a spinner assembly to show even the minimum filling/flow of actual fuel or liquid in the vehicle tank at the time of delivery.
BACKGROUND OF THE INVENTION
The petrol pumps dispense petrol or diesel or respective fuel to vehicle tank through nozzle. During dispensing of fuel, the hydraulic meter will measure the fuel. The measurement of fuel is conveyed to electronic display card through sensor cable.
Since air is also a fuel, therefore petrol pump also dispense the air. The air occupies volume, so the meters will measures air & measurement will conveyed to display card. But, customer will not able to know that his vehicle tank is filled with air instead of fuel. Therefore customer will be cheated by petrol pump filler.
To avoid such kind of customer cheating, it required a sight flow indicator system before nozzle filling fuel
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inside the Tank. This Sight flow indicator is fitted at nozzle inlet through which fuel dispense to vehicle tank.
Thus there is a need for a sight flow indicator system for use in fuel dispensing units show, even the minimum filling/flow of actual fuel or liquid in the vehicle tank at the time of delivery.
OBJECTS OF THE INVENTION
Accordingly, one object of the present invention is to overcome the problems/drawbacks of the prior art/existing knowledge.
Another object of the present invention is to provide a high sensitive sight flow indicator system to show even the minimum filling/flow of actual fuel or liquid in the vehicle tank at the time of delivery.
SUMMARY OF THE INVENTION
According to one aspect of the present invention there is provided a sight flow indicator system for use in fluid/liquid dispenser unit, said system comprising :
housing;
plurality of connector means operatively connected on both ends of said housing so as to allow entry and exit of fluid/liquid;
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indicator means being operatively disposed inside said housing and interengaged with said housing on one end and one of the connector means of said connector means; spinner means located co-axially inside said indicator means in a manner it is partially or wholly visible wherein said spinner means being such that rotational motion of said spinner means being initiated by even lowest fluid pressure of the fluid/liquid flowing through the system.
DETAILED DESCRIPTION OF THE INVENTION
Sight flow Indicator system of the present invention is fitted between hose outlet and nozzle inlet. The Sight flow indicator is used in Petrol Pump and all kind of fuel or liquid dispenser. Sight Flow Indicator system of the present invention comprises rotational spinner facility (Through about 360°).
General Working:
Fuel dispensers and pump is used to dispense different fuels through nozzle into vehicle tank. After lifting nozzle. Pump Electronics get signal to start the motor. Motor will drive pumping unit and metering unit. As soon as nozzle lever is pressed, the pumping unit of fuel suck the fuel from underground fuel tank. Then fuel is flowing through respective metering unit, solenoid valve, outlet
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casting & hoses. Then the respective fuel entered into Sight flow indicator from hose outlet.
The sight flow indicator comprises visible two transparent glass windows which will show actual flow of fuel into vehicle tank. The sight flow indicator glass is properly seal with the help of rubber gaskets. So, air will not get enter into vehicle tank and fuel will not leak from gasket and glass sealing area.
The sight flow indicator is also having spinner which is visible through glass window. The spinner is mounted centrally of Sight flow indicator housing with the help of Spinner shaft (stainless steel metallic wire). There are pair of Helical spring & washer to serve as a stopper for spinner. So that at very high flow rate of fuel the spinner will not come out along with fuel. It will not allow the spinner to get jammed in nozzle inlet port.
The spinner is in HELLICOID (Twisted) shape. As fuel get entered in the sight flow indicator, it will strike on the spinner surface. Due to helicoidal shape of spinner, spinner will rotate by fuel flow pressure itself through 360°. This shape is allowed to rotate the spinner in lowest flow rate (i.e. Minimum 3 Liters per minute) of fuel. This will also help to rotate the spinner in turbulent flow (i.e. suddenly varying flow rate) of fuel.
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After completion of delivery into vehicle tank, the nozzle lever gets released. Due to this, the fuel pressure is reduced suddenly to certain constant value of pressure. But the shape of spinner will withstand such kind in differential pressure of system. Till to start next delivery spinner will remain stable in glass window. Then same operation gets repeated for each delivery.
The customer will not be cheated by petrol filler due to Sight flow indicator along with spinner assembly. The customer will get correct measured volume amount of fuel by metering unit. Also, this will help for service engineer and filler to identify whether air is get entered inside the pump. So, they will take corrective action to remove air from system. Because air will create vapour lock within the flow which will cause jamming of fuel line.
This sight flow indicator is suitable for both heavy duty (1" Inner Diameter) Hose & standard duty (3/4 " Inner diameter) hose.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Figure 1 shows an isometric view of the sight flow indicator system of the present invention.
Figure 2 illustrates a cross sectional view of the sight flow indicator system of the present invention.
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Figure 3 illustrates an exploded view of the sight flow indicator system of the present invention.
DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Figures 2 and 3 show nozzle connector (1), sight flow indicator housing (2), rubber gaskets (3), indicator glass (4) , hose connector (5), helical spring (6), washer (7) , spinner (8), helical spring (9) and spinner shaft (10) .
Advantages :
• Effective Flow indicator visible area.
• Suitable for all density liquid
• Operates at low flow rate of 4 liters per minute.
• Less weight
• Low cost around $9.66
• Ease of assembly
• Ease of maintenance

Dated this 30th day of September 2008
Saloni Rastogi
Of S. Majumdar & Co.
(Applicant's Agent)
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