EP0932736B1

EP0932736B1 - Swimming pool cleaner component

Info

Publication number: EP0932736B1
Application number: EP97945389A
Authority: EP
Inventors: David Seagrave Atkins
Original assignee: Zodiac Pool Care Europe SAS
Current assignee: Zodiac Pool Care Europe SAS
Priority date: 1996-10-03
Filing date: 1997-09-29
Publication date: 2004-11-24
Anticipated expiration: 2017-09-29
Also published as: ES2234035T3; DE69731761D1; AU728551B2; BR9711848A; CA2266355A1; EP0932736A1; WO1998014678A1; AU4660697A; DE69731761T2; CA2266355C

Description

FIELD OF THE INVENTION

This invention relates to a component for a suction operated automatic swimming pool cleaner as particularly disclosed in US-4193156.

BACKGROUND OF THE INVENTION

Several kinds of swimming pool cleaners have been developed which operate on suction generated by the swimming pool filtration plant. Usually these cleaners require a flexible disc to hold the cleaner against the surface being cleaned and a wear resistant foot which runs over the surface. The foot is moulded to have a stepped configuration so that water can pass under the disc and foot carrying detritus into the cleaner body and thence to be caught in a collection trap or the pool filter.

The foot is firmly resiliently engaged on the body and the disc engaged in a peripheral recess around the foot so that it can rotate around the foot. The components are made of different materials and are costly components of the cleaner.

OBJECT OF THE INVENTON

The Applicant has monitored the wear and tear on many cleaners and the object of this invention is to provide a component which will materially reduce the cost of manufacture of the pool cleaner while in no way reducing its efficacy in use.

SUMMARY OF THE INVENTION

According to this invention there is provided a swimming pool cleaner component comprising a foot and flexible disc moulded as an integral unit, and as defined in claim 1.

Further features of this invention provide for the foot to be rotatable on and supported by the body of the pool cleaner, for the shape of the foot to generally conform to a truncated conical shape and for the inner edges of the surface engaging parts of the foot to be more rigid than the outer edges.

The invention also provides for the disc to have a ring of reduced thickness around the foot and to have radially extending ribs of reduced thickness and a series of venturi openings spaced apart from the foot symmetrically there around. The surface of material around the openings in contact in use with a surface being cleaned will preferably be dished to ensure a very thin suction at the opening.

The invention also provides for the upper surface of the foot to provide a series of sand traps facilitating the transport of sand cleaned from the pool through the cleaner.

The outer edge of the disc will preferably be of serrated shape with short upward projections extending from the peaks of the serrations.

It is a feature of this invention that the component can be moulded from a polyvinyl chloride composition.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other features of this invention will become apparent from the following description of two examples illustrated in the accompanying drawings in which:

Fig. 1: is a plan view of the cleaner component in accordance with a first embodiment of the invention;
Fig. 2: is a diametral section through the central part of the component;
Fig. 3: is a plan view of a second embodiment of the invention;
Fig. 4: is an underneath view of the second embodiment;
Fig. 5: is a diametral sectional elevation on section C-C;
Fig. 6: is an enlarged partial diametral sectional elevation on section B-B;
Fig. 7: is an enlarged diametral section through the central part on section C-C;
Fig. 8: is an enlarged diametral section through the central point on section B-B;
Fig. 9: is a partial sectional elevation showing a hinge detail; and
Fig. 10: is a plan view showing a detail of venturi holes.

DETAILED DESCRIPTION OF THE DRAWINGS

As shown the component 1 for a swimming pool cleaner is preferably moulded of polyvinyl chloride material. This material is chosen to be cross-linkable to enable wear resistance characteristics to be varied to predetermined degrees. The component is designed so that this material can be used without distorting hoop stresses developing in the component during curing. This is achieved by the construction described below.

The component 1 consists of a peripheral annular disc part 2 integrally moulded with a central boss part forming a foot 3 for the pool cleaner. The foot is of truncated conical shape as indicated at 4. This gives a stability to the structure while allowing the base 5 of the foot 3 to be flexible around its outer edges. The conical section emphasises the ability of the foot to deform at the surface being cleaned and so tend to cling to projections and corners formed, for example, by steps on the surface to be cleaned. The normally circular opening into the foot can be given different elongated shapes to assist the facility. Gussets 6 are provided symmetrically spaced around the foot 3 extending between the central and horizontal sections.

An annular inwardly facing rim 7 is provided to rotatably engage in a groove provided around the bottom of a pool cleaner body (not shown).

The base of the foot 3 is of stepped configuration with the lower sections 8 providing the parts of the foot engaging the surface being cleaned during use of the pool cleaner. The indented stepped sections 9 on the bottom surface provide flow openings into the body of the pool cleaner from underneath the foot and disc. The outer part of the surface engaging sections is more flexible than the smaller diameter inner sections.

Further openings 10 through the wall of the base part of the foot 3 allow flow of water above the disc into the pool cleaner body.

The foot 3 is joined to the flexible annular disc 2 by a ring 12 of thin sectioned material which provide great flexibility of the disc 2 relative to the foot 3.

Radially extending upstanding hinge sections 13 of reduced section material are symmetrically distributed across the upper surface of the disc 2 providing both flexibility to the disc and guide paths for sand and other detritus over the top surface of the disc towards the pockets formed between the stepped sections of the foot 3. These hinge sections also enable the effects of hoop stresses occurring during moulding and curing to be overcome. Escape holes 14 are provided through the walls of the pockets not providing flow openings 10 into the body of the cleaner. The intention is to allow escape of sand which may otherwise accumulate.

These hinge sections 13 and the ring 12 of reduced sectioned material ensure a flexibility to the dish which enables it to move over or around obstacles encountered during cleaning of a pool and substantially prevents the cleaner from becoming jammed.

The edge 15 of the disc 2 is serrated and short upstanding and outwardly projecting fins 16 extend from the apices of the serrations.

Venturi shaped holes 17 are provided through the disc at spaced intervals. The disc below these holes 17 is dished as indicated at 18 to provide thin edges around the periphery of the holes. These holes improve the flow characteristics of the water over the surface of the disc into the body of the pool cleaner.

It will be appreciated that the construction described above results in a highly flexible and efficient disc and foot combination which has a central part providing adequate support to hold the body of a pool cleaner properly orientated during use. It further provides substantial cost savings in the manufacture of the components by reduction both in the amount of material required and in the kind of material that can be used in the moulding of the combined components.

Referring to Figures 3 to 10, many features are the same as are shown in Figures 1 and 2 and the same reference numerals for these features are used. The description of Figures 1 and 2 is referred to. No escape holes 14 are provided in this second embodiment. They are not important to have. The venturi shaped holes 17 are so called because they provide a narrowing passage for the radially inward flow of water through the holes, accelerating this flow. Hence the comment that they improve the flow characteristics of the water over the disc into the body of the pool cleaner.

The view of Figure 4 of the underneath of the disc shows a circle 20 which is the position at which the thickness of the disc 2 commences to reduce radially outwardly to the edge 15. Radially inwardly of the circle 20 the thickness of the disc remains constant.

Claims

For a swimming pool cleaner which consists of a body which has first structure for connection to a flexible suction pipe, second structure for intermittent interruption of a flow of water into the suction pipe and third structure for connection to a foot and flexible disc, a component (1) characterized in that it comprises:

a foot (3) and a flexible disc (2) moulded as an integral unit, a central boss part forming said foot (3) with a peripheral base (5),

the boss part (3) having an inwardly facing upper rim (7) for connection to the third structure of the body part, and

the disc (2) being formed as an integral outer annular part extending from the peripheral base (5) of the central boss part (3),

openings (10) through the wall of the boss part (3) above the integral disc (2) to allow flow of water above the disc into the body of the pool cleaner.
A component (1) for a swimming pool cleaner as claimed in claim 1, in which the foot (3) has a truncated conical shape and the rim (7) is inwardly facing.
A component (1) for a swimming pool cleaner as claimed in claim 1, in which the boss has indented stepped sections (9) which provide flow openings into the body of the pool cleaner from underneath the integral foot (3) and disc (2).
A component (1) for a swimming pool cleaner as claimed in claim 1, in which gussets (6) are provided symmetrically spaced around the boss of the foot (3) and the inner part of the foot is less flexible than the outer part of the foot (3).
A component (1) for a swimming pool cleaner as claimed in claim 1, which comprises a ring (12) of reduced sectional material which provides flexibility of the disc (2) relative to the foot (3).
A component (1) for a swimming pool cleaner as claimed in claim 1, in which the disc (2) comprises radially extending upstanding hinge sections (13) of reduced sectional material symmetrically distributed across the upper surface of the disc (2), providing flexibility to the disc and guide paths for sand and other detritus.
A component (1) for a swimming pool cleaner as claimed in claim 1, in which the outer edge (15) of the disc (2) is serrated and short upstanding and outwardly projecting fins (16) extend from the apices of the serrations.
A component (1) for a swimming pool as claimed in claim 1, in which-tapering holes (17) are provided in the disc (2) at spaced intervals and the material of the disc (2) is dished (18) around the holes (17) to provide thin edges around the periphery of the holes (17).