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Patent Searching and Data


Title:
AIR PUMP
Document Type and Number:
WIPO Patent Application WO/2014/005725
Kind Code:
A4
Abstract:
Air pump for inflating small objects such as a bicycle tyre comprises an elongate chamber (80) and a piston (73) slidable in said chamber between a first position and a second position, said chamber having cross-sections of different cross-sectional areas and differing circumferential lengths at the first and second positions, and at least substantially continuously different cross-sectional areas and circumferential lengths at intermediate positions between the first and second positions, the cross-sectional area and circumferential length at said second position being smaller than the cross-sectional area and circumferential length at said first position. Said air pump further comprises a hose (118) communicating the air pump exit valve with a valve on the object to be inflated. The hose comprises an expansion chamber (123) which permits variation of the volume inside the hose.

Inventors:
VAN DER BLOM, Nicolaas (Forbury SquareReading, Berkshire RG1 3EU, GB)
Application Number:
EP2013/002007
Publication Date:
April 03, 2014
Filing Date:
July 08, 2013
Export Citation:
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Assignee:
SIPHO PUMPS LTD (1st. Fl. Davidson House, Forbury SquareReading, Berkshire RG1 3EU, GB)
VAN DER BLOM, Nicolaas (Forbury SquareReading, Berkshire RG1 3EU, GB)
International Classes:
F04B33/00
Download PDF:
Claims:
AMENDED CLAIMS

received by the International Bureau on 10 February 2014 (10.02.2014)

1 . A hose for a piston-chamber combination communicating at one end

5" with an object to be inflated, at the other end with a chamber,

said chamber is comprising an elongate chamber which is bounded by an inner chamber wall, and comprising a piston in said chamber to be engagingly movable relative to said chamber wall at least between a first position and a second position of the chamber.

said chamber having cross-sections of different cross-sect ional areas and differing / 0 circumferential lengths at the first and second longitudinal positions, and at least substantially continuously different cross-sectional areas at intermediate longitudinal positions between the first and second longitudinal positions, the cross-sectional area at said second longi tudinal position being smaller than the cross-sectional area at said first longitudinal position.

between or including said chamber and said hose is comprising an exit valve, which is 15 communicating with a valve between the other end of said hose and an object to be inflated, characterized by the tact that

the size of the internal volume of said hose between said valves is variable by expanding the diameter of its transversal cross-sectional area of said hose, when pressurized. 0 2. A hose according to claim 1 , wherein said piston is scalingly movable,

3. A hose according to claim lor 2. wherein the internal volume of said hose is zero when unpressurized, and >0 when pressurized. <f 4. A hose according to claim 1 - 3, wherein said change is initialed from a certain predestinated pressure inside said hose.

5. A hose according to claim 1 - 4. wherein the expansion of the diameter is takes place on a part of the length of the hose.

6 A hose according to claim 5.. wherein said hose is comprising an inflatable container, which expand when pressurized, and which implode when depressurizcd.

7. A hose according to claim 6, wherein the form of said container is an ellipsoide, when " pressurized, and a. cylinder whe depressurized. 8. A hose according to claim 7, wherein the wall of said container is comprising a layer with reinlOrforcement strengths which iy parallel to the centre axis of the hose.

9. A hose according to claini 7 or 8, further comprising means for for

" limiting the expansion, wherein said container is comprising a stopper for its expansion.