AU721028B2 - Automatic cleaners for sweeping and cleaning swimming pools - Google Patents

Description

AUSTRALIA

PATENTS ACT 1990 COMPLETE SPECIFICATION for a Standard Patent

ORIGINAL

NAME OF APPLICANT: K.K.AUSTRALIA PTY. LTD.

ACTUAL INVENTOR: WIESLAW NIEWIAROWSKI ADDRESS FOR SERVICE: T.R.JACKSON 321 SELBY STREET OSBORNE PARK W A 6017 INVENTION TITLE: AUTOMATIC CLEANERS FOR SWEEPING AND CLEANING SWIMMING POOLS :ASSOCIATED PATENT APPLICATION DETAILS Application No.PN 3987/95 dated 7th. July 1995 The following statement is a full description of this invention, including the best method of performing it known to us P-2 sherone This invention relates to automatic pool cleaners of the type adapted to be connected through a flexible hose to the inlet of a pump circulating water through the pool. One such cleaner is marketed throughout Australia and other countries under the trade mark "Kreepy Krauly". One version of the "Kreepy Krauly" cleaner is described in Australian Patent Specification No.505209.

Such automatic pool cleaners (hereinafter referred to as "automatic pool cleaners of the type described") comprise a body having an inlet, a flexible seal mounted on the body to bear against the surface of the wall or floor of the pool, a flip-flop valve member capable of moving back and forth between two extreme positions for controlling the flow of water through the body (and in so doing produces a water hammer effect which acts on the cleaner to propel it across the surface), an elongated member inclined upwardly from the body connecting the body to the inlet end of a flexible hose said elongated member having two passages or being formed of two parallel tubes through which the water flows alternately.

It has been found that as the water discharges from the upper end of one passage or tube it tends to exert a jetting effect on the water in the other passage or tube and effects the efficiency of the cleaner. It has been found that the efficiency of the cleaner can be improved if the upper ends of the two passages or tubes are connected by an arcuate passage substantially co-planar with the two passages or tubes and the arcuate passage is connected to at least one arcuate outlet passage in a plane at an oo** angle to said first mentioned plane.

Thus the present invention resides in an automatic pool cleaner of the type described characterised in that the upper ends of the two passages or tubes of the elongated member are connected together by an arcuate passage substantially co-planar with the elongated member and the arcuate passage is connected to at least one arcuate outlet passage in a plane at an angle to said first mentioned plane.

Preferably the plane in which the outlet passage is located is at right angles to the plane in which the elongated member is located.

The invention will be better understood by reference to the following description when read in conjunction with the accompanying drawings wherein:- Fig. 1 is a sectional view of a known automatic pool cleaner of the type described; Fig. 2 is a perspective view of the upper portion (enclosed in the circle) of the elongated member of the cleaner of Fig. 1 modified in accordance with the invention; and Fig. 3 is a repetition of Fig. 2 partially sectioned; Referring to Fig. I of the drawings the body 11 of the cleaner is "constructed substantially as described in Australian Patent Specification No.50509 and has a valve chamber 12 in which a wedge shaped hammer *15 valve member 13 is housed so that it can move back and forth with a flip-flop action about an axis coinciding with the apex of the valve member from a position in which it bears against and closes the inlet end of a first passage 14 to a position in which it bears against the inlet end and closes a second passage 15 also formed in the body. The movement of the valve member from one position to the other produces a water hammer effect which acts on the cleaner to propel it across the 9 surface to be cleaned. The elongated member 16 connected to the cleaner body is formed by two lengths of plastic tube 14a and ".."which, in effect, are extensions of the passages 14.and 15. The upper ends 25 of the tubes 14a and 15a are connected to a chamber 17 the upper end of which is pivotally connected to the inlet end of a flexible hose (not shown) by means of a swivel coupling. The base of the cleaner body is provided with laterally projecting wings and a pleated flexible seal which bears on the surface to be cleaned. It is also provided with one or more inlets whilst the valve chamber may be provided with baffle 21. A dive float assembly 22 is pivotally mounted on the body of the cleaner.

With the valve member in the position shown in Fig. 1 the water passing up through tube 14a enters the chamber 17 with a jetting action and this causes the water in the tube 15a to tend to move upwardly and thus reduce the pressure acting on the valve member.

If, in accordance with the invention the circled portion at the top of Fig. 1 is replaced by the construction shown in Figs. 2 3 a more efficient cleaner is provided and it is possible to reduce the diameter of the tubes 14a and 15a. The construction shown in Figs. 2 3 comprises a member 24 having an arcuate passage 25 which is coplanar with the elongated member formed by tubes 14a and 15a. Each end of the arcuate passage 25 is adapted to be connected to the upper ends of tubes 14a and 15a respectively. Arcuate outlet passages 26 and 27 are connected to the arcuate passage 25 on opposite sides thereof and lead to the swivel coupling 28 through which the inlet end of the hose is ,::connected to the elongated member. By bleeding off the water from the arcuate passage 25 through the lateral arcuate passages 26 and/or 27 any 2 jetting action of the water as it enters the area of the arcuate passage between the inlet ends of the passages 26 and 27 is substantially eliminated. Furthermore the water passing from the tube 14a through the passage 25 and into the tube 15a applies additional pressure to the S'flip-flop valve member to move it to its opposite position. Thus it is possible to reduce the diameter of the tubes 14a and 15a so that less water has to be pumped to operate the cleaner which is less noisy.

Claims (7)

1. An automatic pool cleaner including a body: an elongated member having an axis, said elongated member being connected to said body, and having two fluid flow paths therein; a valve mounted relative to said elongated member for alternately directing the flow of fluid between the two fluid flow paths; an arcuate passage; the upper ends of the two fluid flow paths being connected together by said arcuate passage in a first plane substantially co-planar with the axis of the elongated member; and said arcuate passage connected to at least on arcuate outlet passage in a second plane at an angle to the first plane. .o

2. An automatic pool cleaner as claimed in claim 1, wherein the at least one arcuate outlet passage is located in a plane substantially at a right angle to the plane in which the flow paths of the elongated member are located.

3. An automatic pool cleaner as claimed in claim 1, wherein two arcuate outlet passages are provided, oppositely disposed on opposite sides of the oooo arcuate passage.

4. An automatic pool cleaner as claimed in claim 2, wherein two arcuate outlet passages are provided, oppositely disposed on opposite sides of the arcuate passage.

An automatic pool cleaner as claimed in claim 1, wherein the two fluid flow paths are passages in said elongated member.

6. An automatic pool cleaner as claimed in claim 1, wherein the two fluid flow paths are tubes in said elongated member.

7. An automatic pool cleaner substantially as herein before described with reference to the accompanying drawings. DATED this 17"h day of April 2000 KREEP KRAULY AUSTRALIA PTY LTD I: WATERMARK PATENT TRADEMARK ATTORNEYS 4TH FLOOR, DURACK CENTRE" I 263 ADELAIDE TERRACE PERTH WESTERN AUSTRALIA 6000 AUSTRALIA