Components of automatic pool cleaners

Abstract

Components of automatic pool cleaners (APCs) are detailed. The components may include brushes configured to attach to blades of scrubbers of the APCs. The flexible brushes may rotate as their associated blades rotate and have fingers which flex so as to adduce contact between a to-be-cleaned pool or spa surface and bristles protruding outward from sides of the fingers.

Claims

1. An automatic pool cleaner comprising: a. a body (i) configured to travel autonomously along a surface of a pool to be cleaned and (ii) comprising an inlet for receiving water of the pool; and b. a down-force scrubber comprising: i. a shaft positioned at least partially within the body so as to be generally perpendicular to the surface as the body travels therealong; ii. a hub having a circumference; iii. a first brush (A) displaced radially from the shaft about the circumference of the hub, (B) configured to rotate about the shaft, and (C) configured to contact the surface as the body travels therealong; and iv. a blade (A) configured to rotate about the shaft and (B) circumferentially displaced from the first brush about the circumference of the hub.

2. An automatic pool cleaner according comprising: a. a body configured to travel along a surface to be cleaned; b. a shaft positioned at least partially within the body so as to be generally perpendicular to the surface as the body travels therealong; c. a first brush (i) displaced radially from the shaft, (ii) configured to rotate about the shaft, (iii) configured to contact the surface as the body travels therealong, and (iv) comprising: A. a brush body; B. a finger depending from the brush body and comprising opposed first and second major sides; and C. bristles protruding outward from the first major side; and d. a blade (i) configured to rotate about the shaft and (ii) circumferentially displaced from the first brush.

3. An automatic pool cleaner according to claim 2 in which the first brush further comprises bristles protruding outward from the second major side.

4. An automatic pool cleaner according to claim 3 in which the shaft and the blade are parts of a scrubber also comprising a hub interconnecting the shaft and the blade.

5. An automatic pool cleaner according to claim 4 in which the hub comprises an attachment assembly configured to receive the first brush.

6. An automatic pool cleaner according to claim 5 in which (i) the attachment assembly comprises a first recess, (ii) the first brush comprises a member, and (iii) the member is frictionally fitted into the recess to attach the first brush to the hub.

7. An automatic pool cleaner according to claim 6 in which the member is detachable from the recess.

8. An automatic pool cleaner according to claim 7 in which the finger is flexible.

9. An automatic pool cleaner according to claim 8 further comprising a second brush (i) displaced radially from the shaft, (ii) configured to rotate about the shaft, (iii) configured to contact the surface as the body travels therealong, and (iv) circumferentially spaced from the first brush.

10. An automatic pool cleaner according to claim 9 in which the second brush is circumferentially opposed to the first brush.

11. An automatic pool cleaner according to claim 2 in which the bristles comprise at least one pair of generally parallel sections protruding outward from the first major side.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1A is an elevational view of an exemplary scrubber similar to that of those of the van der Meijden application.

(2) FIG. 1B is a perspective view of the scrubber of FIG. 1A.

(3) FIGS. 2A-C are various views of an exemplary brush configured to attach to the scrubber of FIG. 1A.

(4) FIG. 3 is an elevational view of the scrubber of FIG. 1A to which two brushes of FIGS. 2A-C have been attached.

(5) FIG. 4 is a perspective view of the scrubber of FIG. 1A to which one brush of FIGS. 2A-C has been attached for purposes of showing its flexibility.

(6) FIG. 5 is a perspective view of an APC including two scrubbers, to each of which brushes have been attached in a manner similar to FIG. 3.

DETAILED DESCRIPTION

(7) Depicted in FIGS. 1A-B is exemplary scrubber 10. Scrubber 10, which is generally similar to scrubbers of the van der Meij den application, may include blades 14 and shaft 18. Also illustrated in FIGS. 1A-B is hub 20 interconnecting blades 14 and shaft 18. In use, scrubber 10 desirably rotates about shaft 18 so as to move water toward an inlet 21 of a cleaner such as APC 22 (see FIG. 5). When the APC 22 is upright on a bottom surface of a pool, shaft 18 will be generally perpendicular to the plane of the bottom surface and thus scrubber 10 will rotate about an axis perpendicular (or generally so) to the bottom surface.

(8) Consistent with the discussion in the van der Meijden application, blades 14 preferably are semi-rigid in nature, meaning that they have sufficient flexibility to accommodate passage into inlet 21 of APC 22, without blockage, of at least some larger types of debris often found in outdoor swimming pools. The term semi-rigid also means that blades 14 nevertheless have sufficient rigidity to move volumes of water toward the inlet 21 of the cleaner as they rotate about shaft 18. A presently-preferred material from which blades 14 is made remains molded thermoplastic polyurethane, although other materials may be used instead.

(9) Scrubber 10 advantageously may include six blades 14 extending radially from shaft 18. Fewer or greater numbers of blades 14 may be employed as appropriate, however. As illustrated in FIG. 5, two scrubbers 10 preferably are employed as part of APC 22, with each scrubber 10 being positioned at least partly to a side of inlet 21 of the APC 22. Again, though, fewer or greater numbers of scrubbers 10 may be utilized, and each or any scrubber 10 may be positioned in any suitable location.

(10) As shown in FIG. 1A, many of the six blades 14 are circumferentially spaced approximately forty-five degrees, rather than approximately sixty degrees, from adjacent blades 14. This is because attachment assemblies 26 of hub 20 have, in effect, replaced the seventh and eighth blades. The two attachment assemblies 26 are at least partially visible in FIG. 1A spaced circumferentially about shaft 18 by approximately one hundred eighty degrees. Symmetrical positioning of attachment assemblies 26 about shaft 18 presently is preferred, although situations may arise in which an odd number of assemblies 26, or asymmetrical positioning of an even number of assemblies 26, is desired.

(11) The exemplary attachment assembly 26 of FIG. 1A may comprise at least one recess 30A. In the version of scrubber 10 depicted in FIG. 1A, recess 30A is formed by a pair of spaced walls 34A-B connected to hub 20. A second recess 30B, formed by a pair of spaced walls 38A-B connected to hub 20, also appears in FIG. 1A.

(12) Shown especially in FIGS. 2A-C is exemplary brush 42. Included as part of brush 42 is member 46, which is sized and shaped to be frictionally fitted into recesses 30A and 30B. Concurrently, clips 50 of brush 42 frictionally slide along walls 34A-B and 38A-B. Manipulating brush 42 in this manner connects the brush 42 to scrubber 10 for useas shown in FIGS. 3-5. Because brush 42 is likely to wear through use, it preferably may be detached from scrubber 42 (as through manual force, for example) for replacement.

(13) Also included as parts of brush 42 are brush body 54, fingers 58, and bristles 62. Fingers 58 depend from body 54, with each finger 58 comprising opposed major sides 66A-B. Bristles 52 protrude outward from these major sides 66A-B. Although FIGS. 2A-5 illustrate three fingers 58 depending from each body 54, more or fewer fingers 58 may be present instead if appropriate or desired.

(14) Fingers 58 beneficially are flexible. Accordingly, as shown in FIG. 4, fingers 58 may flex as blades 14 rotate about shaft 18. Whereas major sides 66A-B are nominally vertical when APC is upright (e.g. FIG. 5) and blades 14 are not rotating, flexing of fingers 58 causes major sides 66A-B to become more closely parallel to the surface to be cleaned. Consequently, because bristles 52 protrude outward from major sides 66A-B, these bristles 52 become more closely perpendicular to the to-be-cleaned surface as the fingers 58 flex. Bristles 52 thus in use may contact the to-be-cleaned surface so as to scrub the surface and suspend bottom-dwelling debris into the water of the pool for evacuation into inlet 21 of APC 22. Consistent with other suction-type APCs, APC 22 also may include body 70 through which the evacuated water may flow to outlet 74 and then into a hose, all under influence of a pump.

(15) Moreover, because scrubber 10 rotates about an axis perpendicular to the to-be-cleaned surface, the speed of movement of brushes 42 (and hence of bristles 52) relative to the surface may be faster than that of passive devices which merely are dragged along the surface. This relative speed of movement likewise may be faster than that of rollers, which typically rotate about axes parallel to the surface and in the same direction as the wheels or tracks of an associated cleaner. Rotation of scrubber 10 about the perpendicular axis also requires approximately fifty percent less surface-area contact between brushes 42 and the pool surface to scrub an equivalent width of pool surface than would a roller, whose length must span that entire width. This decreased surface-area contact of brushes 42 produces less resistance on the drive system of APC 22 than would rollers, potentially enhancing the longevity and robustness of the drive system.

(16) If scrubber 10 is configured to rotate only in one direction, bristles 52 need necessarily be present only on whichever of major sides 66A or 66B is the leading side for purpose of the rotation (as the other, trailing major side will flex away from the to-be-cleaned surface). It nevertheless may be advantageous to include bristles 52 on the trailing major side 66B or 66A of brush 42 so that, when bristles 52 on the leading side wear, brush 42 may be switched to a circumferentially opposite location on scrubber 10 so that the previously-trailing side becomes the leading side and presents unworn bristles 52 to the to-be-cleaned surface. This switch effectively can double the useful life of a brush 42. (And of course, if scrubber 10 ever is configured to rotate both clockwise and counterclockwise, including bristles 52 on both major sides 66A-B may be valuable.)

(17) The foregoing is provided for purposes of illustrating, explaining, and describing embodiments of the present invention. Modifications and adaptations to these embodiments will be apparent to those skilled in the art and may be made without departing from the scope or spirit of the invention. Also, although pool and spa are sometimes used separately, any reference to pool herein may include a spa, hot tub, or other vessel in which water is placed for swimming, bathing, therapy, or recreation. Finally, incorporated herein in their entirety by this reference are the contents of the van der Meij den application.