AU2009200063B2

AU2009200063B2 - Float device

Info

Publication number: AU2009200063B2
Application number: AU2009200063A
Authority: AU
Inventors: Michael John James
Original assignee: Fuel Active Ltd
Current assignee: Fuel Active Ltd
Priority date: 2009-01-07
Filing date: 2009-01-07
Publication date: 2015-02-19
Anticipated expiration: 2029-01-07
Also published as: AU2009200063A1

Abstract

Abstract A float device for use in drawing liquids such as fuel from a tank or other reservoir is disclosed. The device comprises a float arranged for rising and falling with the level of liquid in the tank and a liquid pick-up duct, which comprises a flexible tube having its 5 free end coupled to the float. The float is arranged for vertical movement within a filter or other member, which encloses the float and the flexible tube. The filter or other member is elongate and tubular in construction and comprises an open lower end. 111 -'-20 ri'.FIG. rr , oo o oooo, sooooo oos 19 ** ***** 19

Description

AUSTRALIA PATENTS ACT 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT ORIGINAL Name of Applicant/s: Michael John James Actual Inventor/s: Michael John James Address for Service is: SHELSTON IP 60 Margaret Street Telephone No: (02) 9777 1111 SYDNEY NSW 2000 Facsimile No. (02) 9241 4666 CCN: 3710000352 Attorney Code: SW Invention Title: FLOAT DEVICE The following statement is a full description of this invention, including the best method of performing it known to me/us: File: 61361AUP00 -2 This invention relates to a float device for use in drawing liquids such as fuel from a tank or other reservoir. Any discussion of the prior art throughout the specification should in no way be considered as an admission that such prior art is widely known or forms part of common 5 general knowledge in the field. In conventional fuel tanks, the fuel is drawn from a point adjacent the bottom of the tank in order to enable the pick-up of fuel even when the level of fuel in the tank is low. However, a disadvantage of this arrangement is that any water and/or sediment which has accumulated at the bottom of the tank can be drawn up with the fuel. 10 UK Patent Number GB2 350 337B discloses a solution to this problem in the form of a float device having a float arranged for rising and falling with the level of fuel in the tank, and a fuel pick up duct which comprises a flexible tube having its free end coupled to the float, the float being arranged for vertical movement within a filter which encloses the float and the flexible tube. 15 In use, the float ensures that the fuel entry or pick-up end of the tube is always adjacent the surface of the fuel in the tank. Accordingly, the pick-up point is always adjacent the surface of the fuel in the tank and thus the risk of drawing up a sediment or water is alleviated. The filter in which the float moves vertically comprises an elongate perforated tube 20 which is closed at its lower end by a solid or perforated end wall. A disadvantage of this arrangement is that the length of the filter needs to be accurate, otherwise it will abut the bottom of the tank and prevent the device from fitting properly. Alternatively, if the filter is too short, the pick-up end of the tube will not reach to the bottom of the tank and as such the fuel capacity of the tank is not maximised. 25 It is an object of the present invention to overcome or ameliorate at least one of the disadvantages of the prior art, or to provide a useful alternative. Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is to say, in the 30 sense of "including, but not limited to". In accordance with the present invention, as seen from a first aspect, there is provided a float device for use in drawing liquids such as fuel from a tank or other reservoir, the -3 device comprising a float arranged for rising and falling with the level of liquid in the tank, and a liquid pick-up duct which comprises a flexible tube having its free end coupled to the float, the float being arranged for vertical movement within a filter or other member which encloses the float and the flexible tube, wherein the filter or other 5 member is elongate and tubular in construction and comprises an open the lower end. In use, the device operates in the same manner as the float device of UK Patent Number GB2 350 337B. However, the lower end of the filter or other member is open thereby allowing the float to extend partially below the filter or other member when the level of fuel in the tank is low. In this way a device with a slightly shorter filter or other 10 member can be fitted into a tank to ensure that the device fits and to allow for manufacturing tolerances or deformations in the tank. However, when the level of fuel is low, the float extends below the level of the filter or other member so that more fuel can be drawn from the tank compared with the device disclosed in UK Patent Number GB2 350 337B. It will be appreciated that a device having a filter or other member of a 15 particular length can thus be fitted to tanks having a range of different depths. The end of the tube may be outside the filter or other member when the fuel in tank is low and thus the float preferably carries filter means arranged to filter the liquid being drawn up the tube. Preferably the float comprises a hollow chamber to which said tube is connected, the 20 chamber comprising an apertured wall forming said filter means. Preferably the apertured wall forms the bottom wall of the float, so that filtered fuel can be drawn right down to the point where the float buts the bottom of the tank. Also in accordance with this invention, as seen from a second aspect, there is provided a float device for use in drawing liquids such as fuel from a tank or other reservoir, the 25 device comprising a float arranged for rising and falling with the level of liquid in a reservoir, and a liquid pick-up duct which comprises a flexible tube having its free end coupled to the float, the float being arranged for vertical movement within an enclosure which encloses the float and the flexible tube, wherein the float carries filter means arranged to filter liquid being drawn up the tube. 30 Preferably the float comprises a hollow chamber to which said tube is connected, the chamber comprising an apertured wall forming said filter means. Preferably the apertured wall forms the bottom wall of the float.

-4 Preferably the bottom surface of the float is profiled or comprises projections which prevent the apertured wall from abutting the bottom surface of the tank and thereby inhibiting the flow of liquid. An embodiment of the present invention will now be described by way of an example 5 only and with reference to the accompanying drawing, the single figure of which is a sectional view through a float device in accordance with the present invention. Referring to the drawing, there is shown a float device for fitting to a circular aperture formed in the top wall of a fuel tank (not shown). The device comprises an elongate circular-section of filter in the form of a metal sleeve 10 provided with an array of 10 apertures 11. The sleeve 10 is open at its lower end and closed at its upper end by a flanged end cap 12, which is arranged for securing around its periphery to the edges of the aperture in the fuel tank. A rigid feed pipe 13 extends through the end cap 12, the lower end of the pipe 13 being connected to an elongate coiled flexible tube 14 of plastics material. The lower end of 15 the flexible tube 14 is connected to a float 15 by means of a tubular connector 20. The float 15 is generally circular in section and is arranged to freely move vertically within the sleeve 10 with the level of fuel in the tank. The float 15 comprises a sealed upper chamber 16 which is filled with air and a separate bottom chamber 18 having bottom and side walls which are provided with apertures 19. The bottom chamber 18 20 comprises an outlet duct connected to the flexible tube 14 via the connector 20. In use, when fitted to a fuel tank, the float 15 floats on the surface of the fuel and fuel is drawn into the lower chamber 18 through the apertures 19 and along the flexible tube 14. The apertures 19 serve to filter the fuel and prevent sediment and other matter from being drawn up the flexible tube 14. The apertures 11 in the sleeve 10 also serve to 25 prevent sediment and other matter from entering the device. As the level of fuel falls, the lower end of the float 15 moves out of the sleeve 10 as shown, thereby allowing fuel to be drawn to a level slightly below the sleeve 10. In this manner, the volume of fuel in the tank can be maximised even if the sleeve 10 does not reach fully to the bottom of the tank.

Claims

1. A float device for use in drawing liquids such as fuel from a tank or other reservoir, said device including a float arranged for rising and falling with the level of liquid in said tank, and a liquid pick-up duct which includes a flexible tube having its free end coupled to said float, said float being arranged for vertical movement within a filter or other member which encloses said float and said flexible tube, wherein said filter or other member is elongate and tubular in construction and has an open lower end, said lower end of said filter being open thereby allowing said float to extend partially below said filter or other member when the level of fuel in said tank is low.

2. A float device according to claim 1, wherein said float carries filter means arranged to filter said liquid being drawn up said tube.

3. A float device according to claim 1 or claim 2, wherein said float has a hollow chamber to which said tube is connected, said chamber including an aperture wall forming said filter means.

4. A float device according to claim 3, wherein said aperture wall forms the bottom wall of the float, so that filtered fuel can be drawn right down to the point where the float butts the bottom of said tank.

5. A float device substantially as herein described with reference to the accompanying drawings. JAMES, MICHAEL JOHN By his Patent Attorneys ARMOUR IP P2081 AUOO