EP2743429B1

EP2743429B1 - Automated pool cleaning vehicle with scrubber apparatus

Info

Publication number: EP2743429B1
Application number: EP13197509.6A
Authority: EP
Inventors: Wing-Kin Hui; Wing-Tak Hui
Original assignee: Upward Sales Ltd
Current assignee: Compurobot Technology Co
Priority date: 2012-12-17
Filing date: 2013-12-16
Publication date: 2016-10-05
Anticipated expiration: 2033-12-16
Also published as: EP2743429A1; ES2607756T3; CN103867000A

Description

This application mentions the Applications 13/531,594 and 12/939,079 , filed by co-inventor, Wing-kin HUI, for POOL CLEANING VEHICLE HAVING SIDE VENTS AND DUCTS POOL CLEANING VEHICLE WITH ENDLESS LOOP TRACK, respectively and filed on Nov.17 & 18, 2008, also respectively.
This application also mentions US 8,225,446 B2 POOL CLEANING VEHICLE HAVING SIDE VENTS AND DUCTS and issued on July 24, 2012

Field of the Invention

This invention generally relates to the field of automated pool products. Particularly, this invention relates to an automated swimming pool cleaning vehicle (PCV) for facilitating thorough cleaning of the pool water and pool surfaces. More particularly, this invention relates to devices and cleaning structure used in cooperation with a PCV having a set of spaced apart wheels and providing structure for cleaning and scrubbing the pool surface.

Background of the Invention

It is well accepted that submersible automated pool cleaning devices, such as self-propelled pool cleaning vehicles (PCV's) are essential to the proper maintenance of a pool, whether the pool be above or below ground. The typical PCV includes a housing and drive members. The drive members attach to the housing usually through connection to a chassis. Drive members include wheels, endless loop tracks and combinations of each. Additionally, vehicles have included two and four wheel drive vehicles in various combinations and variations. In the case of a belt or endless loop track, the track wraps around the drive and/or idler wheels or rollers.
It will be appreciated that a vehicle may also have some combinations of wheels and/or rollers and the vehicle may also be a two or four-wheel drive vehicle. The endless loop track may be fitted over any combination of two or four-wheel drive vehicles. Such tracks have been found to be an effective means for moving the vehicle around the surface of the pool while the vehicle is submerged.
Of course, the primary purpose for all PCV's is to clean the pool and pool water. In order to properly maintain clean pool water, the water itself as well as the pool surfaces must be cleaned and kept clean. It is imperative to keep the pool surfaces free from the buildup of dirt and debris. Once dirt and/or debris is allowed to settle in on the pool surface, algae forms. A large enough buildup of such algae can cause the pool pH to become unbalanced and the pool water unstable.
Sometimes drastic efforts caused by "dirty" water result in the entire contents of the pool being drained and starting again. As can be appreciated this is an expensive and time consuming process. Additionally, without thorough cleaning and maintenance, the situation will simply be repeated. There is no guarantee, without proper maintenance methods that the water will not simply revert to the same "dirty" condition.
Of special concern in this regard, is the fact that embedded particulates can be particular concerned. As noted by others, these embedded particulates can cause fatal consequences in term of "dirty water". It can lead to the emptying of the pool of all its water for dry cleaning. Clearly, such a condition is to be avoided if at all possible.
Clearly, there is a strong industry-wide need to prevent the buildup of particulates in the pool water. There is even a stronger need to prevent the embedding of such particulates in the surface of the pool. Cleaning each and every square millimeter of the pool's surface manually is simply not a practical solution. Therefore, Applicant has developed a structure for using the automated pool cleaning vehicle to dislodge even embedded particulates in the surface of the pool. Additionally, the cleaning structure, in accordance with the invention herein, facilitates the PCV in thoroughly cleaning the dirt and debris dislodged from the pool's surface. Thus, the structure in accordance with the invention herein, not only serves the short term goal of keeping the water clean and free from dirt and debris, but also is helpful in accomplishing the long term goal of preventing the buildup of such particulates on and in the surface of the pool by removing the same from the pool water.
What is needed is cleaning structure for a submersible automated pool cleaning vehicle (PCV), which is adapted to clean the pool surface by dislodging dirt and debris from the surface of the pool and further to dislodge even embedded dirt and debris from the surface of the pool using the automated motion of the PCV.
European patent EP2450505 discloses a pool cleaning vehicle as defined in the preamble of claim 1. EP2163711A2 , DE202011051889U1 and EP2447449A2 disclose pool cleaners according to the prior art.

Summary of the Invention

The cleaning structure for a Pool Cleaning Vehicle (PCV), in accordance with the present invention defines a sanitizing structure. Such structure is limited to a PCV having spaced apart free-spinning and drive wheels and not drive tracks, which was the subject of an earlier patent specification by the one of the inventors herein. The sanitizing structure herein is a combination of the cleaning member on the PCV chassis, the suction created by the PCV for absorbing dirt and debris through the PCV intakes and the scrubbing elements associated with the wheels. The scrubbing members include elements extending from the wheels. In an exemplary embodiment, the wheels include wheel covers substantially covering the wheels. The scrubbing elements extend from the wheel covers. The cleaning member may be a rotating brush attached to the bottom of the PCV housing and may include bristles for dislodging dirt and debris as the PCV moves along the pool surface. As the PCV with the sanitizing structure, in accordance with the invention, moves along the pool surface, the wheels with the scrubbing elements and the bristles on the housing dislodge dirt and debris. Thus, the dirt and debris dislodged by the cleaning and scrubbing members are then sucked up by the PCV through housing intakes, cleaning and sanitizing the pool water.
It is an object of this invention to provide a cleaning structure attachable to the PCV through the chassis of the drive wheels and housing for sanitizing swimming pool water. The object of the present invention is solved by the technical features of claim 1.
It is an additional object of this invention to provide such sanitizing structure, which is attachable to a PCV and thereby uses automated means to dislodge dirt and debris from the pool surface.
It is an additional object of this invention to provide such sanitizing structure, which is attachable to a PCV and thereby uses automated means to dislodge dirt and debris embedded in the pool surface.
In accordance with the objects set forth above and those that will be described hereinafter, the PCV for sanitizing water in a swimming pool in accordance with this invention comprises:

a housing having an exterior and an interior and including intakes and a vacuum member for drawing water into the housing through the intakes, the housing including a filter member for filtering water drawn into the housing through the intakes and an outlet for expelling the filtered water back into the pool;
a chassis attached to the housing and being generally within the interior;
drive means attached to the chassis for propelling the PCV throughout the surface of the pool, the drive means including spaced apart wheels connected to axles for receiving power from the drive means;
a cleaning member attached to the housing, for dislodging particulates;
scrubbing members extending from at least some of the wheels, the portion extending from the wheels defining scrubbing elements;
whereby, as the PCV moves around the pool surface the scrubbing elements contact the surface of the pool and dislodge dirt and debris and whereby the vacuum member absorb the dislodged dirt and debris to facilitate sanitizing the pool water.

In another exemplary embodiment of the PCV, in accordance with this invention, the wheels having scrubbing elements include wheel covers, covering at least a substantial portion of the wheels and the scrubbing elements are embedded in the wheel covers.
According to an exemplary embodiment, the wheels may be connected to the chassis through gears or a set of gears.
According to an exemplary embodiment, the wheels are easily detached from the chassis and easily re-attached to the chassis.
According to an exemplary embodiment, the wheel covers are easily detached from the wheels and easily re-attached to the wheels, in particular by stretching the wheel covers over the wheels.
According to an exemplary embodiment, the cleaning member defines a rotating brush roller connected to the bottom of the housing adjacent the intakes. According to an exemplary embodiment, the brush roller is easily detached from the wheels and easily re-attached to the chassis.
In an exemplary embodiment, all of the spaced apart wheels have scrubbing elements and include wheel covers coverering at least a substantial portion of the wheels and the scrubbing elements extend from the wheel covers.
In another exemplary embodiment, the wheels include a tire made of a soft rubber compound and the wheel covers are made from elastomer.
In another exemplary embodiment, the wheel covers include a scrubbing element insert made from a material specifically designed for scrubbing pool surfaces.
The wheel covers include extended scrubbing elements, extending on the side from the wheel covers and away from the housing. The extended scrubbing elements may include a plurality of circular members. The plurality of circular members may have parallel axes and overlap. The circular scrubbing elements may be made from a material specifically designed to loosen stains and dirt and debris from pool surfaces with rotating action.
It is an advantage of the instant invention to provide a sanitizing PCV, which cleans and sanitizes pool water in an automated fashion by dislodging particulates from the surface of the pool.
It is also an advantage of the invention to provide detachable sanitizing elements to a pool cleaning vehicle, which can be replaced upon becoming worn.

Brief Description of the Drawing

For a further understanding of the objects and advantages of the present invention, reference should be made to the following detailed description, taken in conjunction with the accompanying drawing, in which like parts are given like reference numerals and wherein:

Fig. 1 is a perspective view of a pool cleaning vehicle having the sanitizing structure according to the prior art.
Figs. 2 is side perspective view of an exemplary embodiment of the PCV according to the prior art illustrating wheel covers in the applied and unapplied states having embedded scrubbing elements in the wheel covers.
Figs. 3 illustrates, in perspective, the wheel cover according to the prior art applied to and/or separated from the wheel of the PCV.
Fig. 4 is a side by side illustration of the wheel cover according to the prior art from the wheel.
Fig. 5 is a partial sectional view of the wheel cover being applied to the wheel of the PCV in accordance with this invention.
Fig. 6 is a perspective view of another exemplary embodiment of the pool cleaning vehicle having additional sanitizing structure in accordance with this invention.
Fig. 7 is a perspective view of alternative scrubbing elements in accordance with this invention attached to the wheel cover of the wheel of the PCV in accordance with this invention.

Detailed Description Of The Invention

With respect to Fig. 1 there is shown an exemplary embodiment of the submersible pool cleaning vehicle (PCV) having the cleaning structure in accordance with the prior art generally denoted by the numeral 20.
The PCV 20 includes a housing 22 having an exterior 24 and an interior (not shown). Within the interior of the housing is a motor for creating a vacuum effect. The housing includes a conduit terminating at intakes for drawing water into a filter system and an outlet 25 for expelling filtered water back into the pool. Such features are well known and are described in the art. For example, US Patent 7,867,389 B2 and US Application 12/100,414 show further details of the above functions, the entire specifications of which are specifically incorporated herein for all purposes.
The PCV 20 includes a chassis (not shown) generally within the interior of the housing 22. The PCV includes an electrical motor (not shown) which drive wheels 30. The PCV includes additional free-spinning wheels 32. The free-spinning wheels 32 are also mounted on the chassis.
The wheels, whether drive wheels 30 or free spinning wheels 32 are spaced apart from one another. This is in contrast to earlier described inventions in this art where the PCV included a drive track instead of spaced apart wheels. For example, such inventive aspects of cleaning a pool surface under water are described in a related application, namely US Application 12/939,079 , the entire specification of which is specifically incorporated herein for all purposes. When the drive motor is activated, the PCV is propelled by supplying rotational power to the drive wheels 30.
The PCV also includes a cleaning member 40. The cleaning member 40 is mounted on an axle between drive wheels 30 as shown clearly in Fig. 1. In the exemplary embodiment shown, each pair of drive wheels 30, front and rear, includes a brush roller 42 defining a cleaning member 40. Under power, the drive wheels 30 turn the roller 42 with sufficient torque to cause the brush roller 42 to dislodge particulates and dirt and debris. The brush roller 42 can be easily removed and replaced as needed.
An intake (not shown) is located in close proximity to the roller 42 for sucking up such loosened matter. Again, this is well understood in the art and the references specifically incorporated above and below provide sufficient basis for understanding these principles.
With particular reference to Fig. 2 there is shown another illustration of the PCV 20 in accordance with the prior art. Particularly illustrated are the wheels 30 and 32 having wheel covers 34 removed from two of the wheels 30 and 32. As shown, the wheel covers 34 fit over either the drive wheel 30 or free-spinning wheel 32 without modification. In other words, the wheel cover 34 is the same for the drive wheel 30 as it is for the free-spinning wheel 32.
The wheel cover 34 is made from an elastic material which fits over the wheel and covers the outer diameter dimension of the wheel. In this manner, the wheel cover 34 covers substantially the wheel. The fit can be made tight or sloppy. In some instances, a sloppy fit serves the purpose of dislodging particulates, dirt and/or debris better than a tight fit. At other times, the reverse is true and an exemplary embodiment with either a tight fit or a sloppy fit are both within the spirit and scope of the present invention. In the exemplary embodiment illustrated in Figs. 1 & 2, the wheel cover 34 is tightly stretched over the wheel forming a snug fit.
As also illustrated in Fig. 2, the drive wheel 30 includes gearing 50 for compatible mating of the drive wheel 30 with the chassis gearing 52. A locking member 54, locks the wheel to the chassis. In applying the wheel cover 34 to the drive wheel 30, the cover fits so that it does not interfere with the ability of the drive wheel 30 to be driven by the PCV motor.
The wheel cover 34 is easily removed from either drive or free-spinning wheel by again stretching the elastic wheel cover 34 over the wheel and completing the removal process. Thus, should the wheel cover 34 become worn or a different type of wheel cover 34 for a particular pool surface is desired, such removal can easily be facilitated in this manner.
The flexibility of selecting a wheel cover to match the kind of cleaning function desired enables the PCV in accordance with this invention to maximize the cleaning such that the pool can, in fact, be sanitized. Additionally advantageous, long standing stains found in certain pool surfaces can be removed by automatic means, without having to resort to manual brushes and the like.
With respect to Figs. 3 and 4 are detailed views that illustrate the construction of the drive wheel 30 and wheel cover 34. The wheel cover 34 includes scrubbing elements 36. The scrubbing elements 36 are embedded in the wheel cover 34. The scrubbing elements 36 extend from the wheel cover 34 as most clearly illustrated in Fig. 4.
In an exemplary embodiment, the wheel covers 34 are made from elastomer. The degree of hardness of the elastomer depends upon the pool surface. On some pool surfaces a harder degree of elastomer is more desirable than on others. By providing a variety of different wheels which are easily changeable, the user can custom make his PCV for his own particular pool surface.
Likewise, the scrubbing elements 36 are similarly customizable. For example, a wheel cover 34 may have one type of hardness and the scrubbing element can be imbedded with a specific material that would be best suited for that surface. In this way, a variety of wheel covers and scrubbing elements can be offered to the user to best suit the needs of a particular pool surface.
The drive wheels 30 as well as the free spinning wheels 32 may include tires (not shown) where the tire is made from a soft rubber compound and the wheel cover is made from an elastomer. In the exemplary embodiment of Figs. 3 & 4, the wheel cover defines the tire and can be made from various compounds, both natural and synthetic that would satisfy the requires of moving the PCV and cleaning the underwater pool surface.
With particular reference to Fig. 5, there is shown the partial sectional illustration of the wheel cover 34 according to the invention having scrubbing elements 36 attached over the wheel 30. As noted above the wheel cover 34 is made from elastic material and is stretched over the wheel 30. Also illustrated is that the wheel cover 34 does not interfere with the gearing 50.
With respect to Figs. 6 & 7, there is shown another exemplary embodiment of the scrubbing elements in accordance with the invention, generally designated by the numeral 60. In this embodiment, the scrubbing elements 60 extend from the wheel cover 34, on the side opposite to the housing 22. The scrubbing elements 60 include a plurality of individual members 62.
The members 62 define circular scrubbing elements having an outer surface 64 which, in the illustrated embodiment, is parallel to the central plane (mid-plane) of the corresponding wheel 30. The outer surface 64 is made from a material designed to dislodge dirt and remove stain from a pool surface as the PCV collides with the surface during normal operation. For example, the material such as a vinyl or rubber sponge having a rough, but non-abrasive surface is suited for such function.
The circular members 62 as illustrated have parallel axes and overlapping, and they are arranged so that their axes are located on an imaginary cylinder having as axis the axis of the corresponding wheel 30. In the exemplary embodiment shown, there are five such members. In other exemplary embodiments, two members or more than five would also be within the spirit and scope of the invention.
It will be appreciated by those skilled in the art that as the wheels turn, the scrubbing elements 60 rotate. When contact between the scrubbing elements 60 and the underwater pool surface, for example a pool wall, is made, the rotating action continues. As the scrubbing elements rotate against dirt and stain, such are removed from the pool surface so contacted. The dislodged material is sucked by the vacuum created by the motor through the intakes. The water is filtered and then returned to the pool through the outlet 25. In this manner, the pool water is not simply cleaned, but sanitized.
Various other types of scrubbing elements which extend from the wheel cover are also within the spirit and scope of the invention. For example, the scrubbing element 60 may be of a, irregular shape or a rectangle or square configuration, all within the spirit and scope of the instant invention. Additionally, the number of members which form the scrubbing element 60 may also vary within the spirit and scope of the invention.
While the foregoing detailed description has described several embodiments of the cleaning structure in accordance with this invention, it is to be understood that the above description is illustrative only and not limiting of the disclosed invention. Particularly, there are varieties of different combinations of embedded and extended scrubbing elements that can be used successfully with the PCV in accordance with this invention, as defined by the appended claims.

Claims

An automated fully submersible pool cleaning vehicle (PCV) (20) for sanitizing water in a swimming pool, the PCV (20), comprising:
a housing (22) having an exterior (24) and an interior and including intakes and a vacuum member for drawing water into the housing (22) through the intakes, the housing (22) including a filter member for filtering water drawn into the housing (22) through the intakes and an outlet (25) for expelling the filtered water back into the pool;

a chassis attached to the housing (22) and being generally within the interior;

drive means attached to the chassis for propelling the PCV (20) throughout the surface of the pool, the drive means including spaced apart wheels (30, 32) connected to axles for receiving power from the drive means;

a cleaning member (40) attached to the housing (22);

scrubbing members extending from at least some of the wheels (30, 32), the portion extending from the wheels (30, 32) defining scrubbing elements (36);

whereby, as the PCV (20) moves around the pool surface the scrubbing elements (36) contact the surface of the pool and dislodge dirt and debris and whereby the vacuum member absorb the dislodged dirt and debris to facilitate sanitizing the pool water; the wheels (30, 32) having scrubbing elements (36) including wheel covers (34) covering at least a substantial portion of the wheels (30, 32) and the scrubbing elements (36) being embedded in the wheel covers (34);

the wheel covers (34) including extended scrubbing elements (60) extending on the side from the wheel covers (34) and away from the housing (22), the extended scrubbing elements (60) including a plurality of circular members (62);

characterized by the fact the plurality of circular members (62) have parallel axes and are overlapping.
The PCV (20) as set forth in Claim 1, wherein the wheels (30) are connected to the chassis through gears (50, 52), so that the wheels (30) are easily detached from the chassis and easily re-attached to the chassis.
The PCV (20) as set forth in Claim 1, wherein the wheels (30) are connected to the chassis through a set of gears (50, 52), so that the wheels (30) are easily detached from the chassis and easily re-attached to the chassis.
The PCV (20) as set forth in any one of Claims 1 to 3, wherein the wheels (30, 32) include a tire made of a soft rubber compound and wherein the wheel covers (34) are made from elastomer, so that the wheel covers (34) are easily detached from the wheels (30, 32) and easily re-attached to the wheels (30, 32) by stretching the wheel covers (34) over the wheels (30, 32).
The PCV (20) as set forth in Claim 4, wherein the wheel covers (34) include a scrubbing element insert made from a material having a rough, but non-abrasive surface, such as a vinyl or rubber sponge.
The PCV (20) as set forth in any one of Claims 1 to 5, wherein the cleaning member (40) defines a rotating brush roller (42) connected to the bottom of the housing (22) adjacent the intakes.
The PCV (20) as set forth in Claim 1, wherein the extended scrubbing elements (60) are made from a material having a rough, but non-abrasive surface, such as a vinyl or rubber sponge, so that stains and dirt and debris are loosened from pool surfaces with rotating action.