CYLINDRICAL ROTARY TIRE BRUSH ELEMENT WITH AN INTEGRATED WEAR INDICATOR

Abstract

The present invention, a cylindrical rotary tire brush element with an integrated wear indicator, is intended to replace the prior art cylindrical rotary tire brush element in a prior art rotary tire brush assembly. The cylindrical rotary tire brush element with integrated wear indicator is intended as a drop-in replacement to the prior art cylindrical rotary tire brush element of a prior art rotary tire brush assembly. The invention is made from at least two homogeneous pluralities of bristles, with each homogeneous plurality of bristles having the same purpose, material, color, and specified length. At least one plurality is a cleaning bristle of a first color and first specified length. At least one plurality is an indicator bristle of a second color and a third specified length, where the second color is a highly noticeable color such as yellow, red, orange, green, or white. The third specified length is equal to the minimum acceptable actual length of the cleaning bristles.

Claims

1. A cylindrical rotary tire brush element with an integrated wear indicator comprising at least two homogeneous pluralities of bristles densely arranged on a cylindrical body, the cylindrical body having a cylindrical outer surface, an axis, a first end, and a second end; wherein each homogeneous plurality of bristles contains bristles having a common purpose, a common material, a common color, and a common specified length; wherein at least one of the homogeneous pluralities of bristles is a first plurality of cleaning bristles of a first color and a first specified length; wherein at least one of the homogeneous pluralities of bristles is a first plurality of indicator bristles of a second color and a third specified length; wherein the number of pluralities of cleaning bristles of a first color and first specified length is always greater than or equal to the number of pluralities of indicator bristles of a second color and third specified length; wherein the first specified length is greater than the third specified length; wherein, in use, the cylindrical body is exposed to rapid rotation about its axis, causing the tips of the bristles of the first plurality of cleaning bristles of a first color and first specified length to repeatedly contact a tire of a vehicle and shear off upon contact, slowing reducing the actual length of the bristles of the first plurality of cleaning bristles of a first color and first specified length; wherein there exists a minimum acceptable actual length for the bristles of the first plurality of cleaning bristles at which the cleaning bristles are able to perform their essential function of cleaning tires; and wherein the third specified length is the minimum acceptable actual length.

2. The cylindrical rotary tire brush element with an integrated wear indicator of claim 1, wherein the indicator bristles are a material consisting essentially of a polymer selected from a list of polyethylene (“PE”), polypropylene (“PP”), and nylon, together with a colorant.

3. The cylindrical rotary tire brush element with an integrated wear indicator of claim 1, wherein the cleaning bristles are a material consisting essentially of a polymer selected from a list of PE, PP, and nylon, together with a colorant

4. The cylindrical rotary tire brush element with an integrated wear indicator of claim 3, wherein the first color is black.

5. The cylindrical rotary tire brush element with an integrated wear indicator of claim 4, wherein the second color is one of yellow, red, orange, and green.

6. The cylindrical rotary tire brush element with an integrated wear indicator of claim 5, further comprising a second plurality of cleaning bristles of a first color and a first specified length and wherein the first plurality of indicator bristles of a second color and third specified length is arranged as a narrow band between the first plurality of cleaning bristles of a first color and first specified length and the second plurality of cleaning bristles of a first color and first specified length.

7. The cylindrical rotary tire brush element with an integrated wear indicator of claim 6, further comprising a third plurality of cleaning bristles of a first color and a first specified length; and a second plurality of indicator bristles of a second color and third specified length; wherein the second plurality of indicator bristles of a second color and third specified length is arranged as a narrow band between the second plurality of cleaning bristles of a first color and first specified length and the third plurality of cleaning bristles of a first color and first specified length.

8. The cylindrical rotary tire brush element with an integrated wear indicator of claim 7, further comprising a fourth plurality of cleaning bristles of a first color and a first specified length; and a third plurality of indicator bristles of a second color and third specified length; wherein the third plurality of indicator bristles of a second color and third specified length is arranged as a narrow band between the third plurality of cleaning bristles of a first color and first specified length and the fourth plurality of cleaning bristles of a first color and first specified length.

9. The cylindrical rotary tire brush element with an integrated wear indicator of claim 8, further comprising a fifth plurality of cleaning bristles of a first color and a first specified length; and a fourth plurality of indicator bristles of a second color and third specified length; wherein the fourth plurality of indicator bristles of a second color and third specified length is arranged as a narrow band between the fourth plurality of cleaning bristles of a first color and first specified length and the fifth plurality of cleaning bristles of a first color and first specified length.

10. The cylindrical rotary tire brush element with an integrated wear indicator of claim 6, further comprising a first plurality of cleaning bristles of a first color and second specified length; a third plurality of cleaning bristles of a first color and a first specified length; a fourth plurality of cleaning bristles of a first color and a first specified length; and a second plurality of cleaning bristles of a second color and third specified length; wherein the second plurality of indicator bristles of a second color and third specified length is arranged as a narrow band between the third plurality of cleaning bristles of a first color and first specified length and the fourth plurality of cleaning bristles of a first color and first specified length; and wherein the first plurality of cleaning bristles of a first color and a second specified length is immediately adjacent to two pluralities of cleaning bristles of a first color and first specified length.

11. The cylindrical rotary tire brush element with an integrated wear indicator of claim 10, further comprising a second plurality of cleaning bristles of a first color and second specified length; a fifth plurality of cleaning bristles of a first color and a first specified length; a sixth plurality of cleaning bristles of a first color and a first specified length; and a third plurality of indicator bristles of a second color and third specified length; wherein the third plurality of indicator bristles of a second color and third specified length is arranged as a narrow band between the fifth plurality of cleaning bristles of a first color and first specified length and the sixth plurality of cleaning bristles of a first color and first specified length; and wherein the second plurality of cleaning bristles of a first color and a second specified length is immediately adjacent to two pluralities of cleaning bristles of a first color and first specified length.

12. The cylindrical rotary tire brush element with an integrated wear indicator of claim 11, wherein the second specified length is shorter than the first specified length.

13. A method for making a cylindrical rotary tire brush element with an integrated wear indicator comprising the steps of selecting a first plurality of cleaning bristles of a first color and first specified length; populating a u-channel with a first end and a second end with the first plurality of cleaning bristles of a first color and a first specified length; capturing the first plurality of cleaning bristles of a first color and first specified length in the u-channel using a retention member; selecting a first plurality of indicator bristles of a second color and third specified length; populating the u-channel with the first plurality of indicator bristles of a second color and third specified length so that the first plurality of indicator bristles of a second color and third specified length immediately follow the first plurality of cleaning bristles of a first color and first specified length; capturing the first plurality of indicator bristles of a second color and third specified length in the u-channel using a retention member; selecting a second plurality of cleaning bristles of a first color and first specified length; populating the u-channel with the second plurality of cleaning bristles of a first color and a first specified length so that the second plurality of cleaning bristles of a first color and first specified length immediately follow the first plurality of indicator bristles of a second color and third specified length; capturing the second plurality of cleaning bristles of a first color and first specified length in the u-channel using a retention member; crimping closed the u-channel so that the bristles and retention member are permanently captured within the u-channel, creating a u-channel assembly; welding the first end of the populated u-channel assembly to a first edge of a cylindrical outer surface of a cylindrical body; wrapping the u-channel in a tight helix around a cylindrical outer surface of a cylindrical body, fully populating the cylindrical outer surface with bristles; and welding the second end of the populated u-channel assembly to a second edge of the cylindrical outer surface of the cylindrical body.

14. The method for making a cylindrical rotary tire brush element with an integrated wear indicator of claim 13 comprising the further steps, inserted immediately prior to crimping closed the u-channel: selecting a second plurality of indicator bristles of a second color and third specified length; populating the u-channel with the second plurality of indicator bristles of a second color and third specified length so that the second plurality of indicator bristles of a second color and third specified length immediately follow the second plurality of cleaning bristles of a first color and first specified length; capturing the second plurality of indicator bristles of a second color and third specified length in the u-channel using a retention member; selecting a third plurality of cleaning bristles of a first color and first specified length; populating the u-channel with the third plurality of cleaning bristles of a first color and a first specified length so that the third plurality of cleaning bristles of a first color and first specified length immediately follow the second plurality of indicator bristles of a second color and third specified length; and capturing the third plurality of cleaning bristles of a first color and first specified length in the u-channel using a retention member.

15. The method for making a cylindrical rotary tire brush element with an integrated wear indicator of claim 14 comprising the further steps, inserted immediately prior to crimping closed the u-channel: selecting a third plurality of indicator bristles of a second color and third specified length; populating the u-channel with the third plurality of indicator bristles of a second color and third specified length so that the third plurality of indicator bristles of a second color and third specified length immediately follow the third plurality of cleaning bristles of a first color and first specified length; capturing the third plurality of indicator bristles of a second color and third specified length in the u-channel using a retention member; selecting a fourth plurality of cleaning bristles of a first color and first specified length; populating the u-channel with the fourth plurality of cleaning bristles of a first color and a first specified length so that the fourth plurality of cleaning bristles of a first color and first specified length immediately follow the third plurality of indicator bristles of a second color and third specified length; and capturing the fourth plurality of cleaning bristles of a first color and first specified length in the u-channel using a retention member.

16. The method for making a cylindrical rotary tire brush element with an integrated wear indicator of claim 13 comprising the further steps, inserted immediately prior to crimping closed the u-channel: selecting a first plurality of cleaning bristles of a first color and a second specified length; populating the u-channel with the first plurality of cleaning bristles of a first color and a second specified length so that the first plurality of cleaning bristles of a first color and a second specified length immediately follow the second plurality of cleaning bristles of a first color and a first specified length; capturing the first plurality of cleaning bristles of a first color and second specified length in the u-channel using a retention member; selecting a third plurality of cleaning bristles of a first color and first specified length; populating the u-channel with the third plurality of cleaning bristles of a first color and a first specified length so that the third plurality of cleaning bristles of a first color and first specified length immediately follow the first plurality of cleaning bristles of a first color and second specified length; capturing the third plurality of cleaning bristles of a first color and first specified length in the u-channel using a retention member. selecting a second plurality of indicator bristles of a second color and third specified length; populating the u-channel with the second plurality of indicator bristles of a second color and third specified length so that the second plurality of indicator bristles of a second color and third specified length immediately follow the third plurality of cleaning bristles of a first color and first specified length; capturing the second plurality of indicator bristles of a second color and third specified length in the u-channel using a retention member; selecting a fourth plurality of cleaning bristles of a first color and first specified length; populating the u-channel with the fourth plurality of cleaning bristles of a first color and a first specified length so that the fourth plurality of cleaning bristles of a first color and first specified length immediately follow the second plurality of indicator bristles of a second color and third specified length; capturing the fourth plurality of cleaning bristles of a first color and first specified length in the u-channel using a retention member; selecting a second plurality of cleaning bristles of a first color and a second specified length; populating the u-channel with the second plurality of cleaning bristles of a first color and a second specified length so that the second plurality of cleaning bristles of a first color and a second specified length immediately follow the fourth plurality of cleaning bristles of a first color and a first specified length; and capturing the second plurality of cleaning bristles of a first color and second specified length in the u-channel using a retention member.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention is illustrated with 11 figures on 8 sheets. The accompanying drawings are incorporated in and constitute a part of this disclosure. The figures are intended to illustrate various embodiments of the invention. The present invention is a cylindrical rotary tire brush element with an integrated wear indicator.

[0030] FIG. 1 is a perspective view of a first embodiment of a prior art cylindrical rotary tire brush element, also known as a stepped wheel brush element. FIG. 2 is a perspective view of a second prior art rotary cylindrical rotary tire brush element. FIG. 3 is a perspective view a prior art rotary tire brush assembly using the second embodiment of the prior art cylindrical rotary tire brush element. FIG. 4 is a perspective view of a prior art rotary tire brush assembly using the first embodiment of the prior art cylindrical rotary tire brush element.

[0031] FIG. 5 is a perspective view of a cylindrical rotary tire brush element with an integrated wear indicator being fabricated.

[0032] FIG. 6 is a close-up showing a plurality of indicator bristles arranged in a narrow band, nestled between a first plurality of cleaning bristles and a second plurality of cleaning bristles.

[0033] FIG. 7 is a perspective view of the present invention, a cylindrical rotary tire brush element with integrated wear indicators.

[0034] FIG. 8 is an isolation of a u-channel being wrapped around a cylindrical body. FIG. 9 is a front isolation of cleaning bristles captured in a u-channel and attached to a cylindrical body.

[0035] FIG. 10 is a u-channel populated with a first plurality of cleaning bristles, a first plurality of indicator bristles, and a second plurality of cleaning bristles.

[0036] FIG. 11 is a close-up showing a plurality of indicator bristles arranged in a narrow band, nestled between a first plurality of cleaning bristles and a second plurality of cleaning bristles in a stepped wheel brush application.

DETAILED DESCRIPTION

[0037] This description is intended to disclose the present invention, a cylindrical rotary tire brush element with an integrated wear indicator. The cylindrical rotary tire brush element with integrated wear indicator is intended to be a drop-in replacement in a prior art rotary tire brush assembly for a prior art cylindrical rotary tire brush element. This description is not intended to limit the scope of the claimed subject matter. Certain terminology is used in the following description for convenience only and is not limiting. The article “a” is intended to include one or more items, and where only one item is intended the term “one” or similar language is used. To assist in the description of the present invention, words such as before, after, first, second, near, far, short, long, top, bottom, side, upper, lower, front, rear, inner, outer, right and left are used to describe the relative sequence, order, proximity, size, and orientation of aspects of the present invention, a rotary tire brush with an integrated wear indicator. The terminology includes the words above specifically mentioned, derivatives thereof, and words of similar import. Once a numbered element is described within this Detailed Description, it may be referred to with respect to other figures.

[0038] A prior art rotary tire brush assembly used in a carwash is comprised of a cylindrical rotary tire brush element; at least two spindles; at least two bearings; a rotary motor; and a power source. One or more couplers may be used to connect multiple cylindrical rotary tire brush element using additional spindles and bearings.

[0039] The present invention, a cylindrical rotary tire brush element with an integrated wear indicator, is intended to replace the prior art cylindrical rotary tire brush element in a prior art rotary tire brush assembly. The cylindrical rotary tire brush element with integrated wear indicator is intended as a drop-in replacement to the prior art cylindrical rotary tire brush element of a prior art rotary tire brush assembly.

[0040] FIGS. 1-2 show a first 1 and a second 2 embodiment of a prior art cylindrical rotary tire brush element 1, 2 used in a prior art rotary tire brush assembly. Referring first to FIG. 2, the second embodiment of the prior art cylindrical rotary tire brush element 2 is comprised of a cylindrical body 19, a first end 18, and a second end (second end is obverse to first end and cannot be seen in perspective view of FIG. 2). A plurality of cleaning bristles 10 of a first color and a first specified length 99 are densely arranged on the cylindrical body 19. The first end 18 has a collar 13 with an opening 74 into which a spindle of a prior art tire brush assembly can fit. The prior art cylindrical rotary tire brush element 2 spins about its axis 75 in use, the axis 75 passing through the center 14 of the opening 74 into which the spindle fits.

[0041] In FIG. 1, the first embodiment of the prior art cylindrical rotary tire brush element 1 is comprised of a cylindrical body 19 having a first end 18 and a second end (second end is obverse to first end and cannot be seen in perspective view of FIG. 1); pluralities of cleaning bristles 10, 110, 210, 310, 410, 510, 610, 710 of a first color and first specified length 99, and pluralities of cleaning bristles 11, 111, 211, 311, 411, 511, 611 of a first color and a second specified length 98. The first end 18 has a collar 13 with an opening 74 that acts as a receiver into which a spindle of a prior art rotary tire brush assembly can fit. The prior art cylindrical rotary tire brush element spins on its axis 75, the axis 75 passing through the center 14 of the opening 74 into which the spindle fits.

[0042] In FIGS. 3 and 4, the first 1 and second 2 embodiments of a prior art cylindrical rotary tire brush element 1, 2 are shown, in situ, in a rotary tire brush assembly 22. In FIG. 3, the second embodiment 2 of a prior art cylindrical rotary tire brush element 2 is shown in a rotary tire brush assembly 22 cleaning the tires 201 of a vehicle 200. There is a plurality of cleaning bristles 10 of a first color and first specified length 99. The rotary tire brush assembly 22 has vertical supports 26, horizontal supports 23, feed hoses 24, and sprayers 25. FIG. 4 shows the first embodiment 1 of a prior art cylindrical rotary tire brush element 1, a stepped wheel brush element 1, in situ, in a rotary tire brush assembly 22. There are pluralities of cleaning bristles 10 of a a first color and first specified length 99 and cleaning bristles 11 of a first color and a second specified length 98. In this view, the collar 13 is visibly attached to the spindle 20, which is supported by a bearing 21.

[0043] FIG. 5 shows the present invention 100, a cylindrical rotary tire brush element with integrated wear indicator 100, in the process of being fabricated. This view is illustrative of the construction of the present invention 100. The cylindrical body 19 is partially populated and exposed. A first plurality of cleaning bristles 10 of a first color and first specified length 99 have been added. A first plurality of indicator bristles 102 of a second color and third specified length 97 has been added. The u-channel 101 in which the bristles 10, 102 are captured is wrapped in a tight helix about the cylindrical body 19. A retaining guard 444 keeps the u-channel 101 and bristles 10, 102 in position, making for densely compacted bristles 10, 102.

[0044] FIG. 6 shows a front isolation of the present invention 100, with a first plurality of cleaning bristles 10 of a first color and first specified length 99, a second plurality of cleaning bristles 110 of a first color and a first specified length 99, and a first plurality of indicator bristles 102 of a second color and a third specified length 97. The plurality of indicator bristles 102 of a second color and a third specified length 97 is arranged in a narrow band and is nested between the two pluralities of cleaning bristles 10, 110. In use, the first plurality of cleaning bristles 10 of a first color and first specified length 99 and the second plurality of cleaning bristles 110 of a first color and first specified length 99 would wear at approximately the same rate, slowly losing length due to repetitive contact with the tires of vehicles. When the actual length of the first plurality of cleaning bristles 10 of a first color and first specified length 99 and the second plurality of cleaning bristles 110 of a first color and first specified length 99 is, on average, equal to the third specified length 97, that of the first plurality of indicator bristles 102 of a second color and a third specified length 97, the first plurality of indicator bristles 102 of a second color and a third specified length 97 will become highly visible indicating that replacement of the present invention 100 is required.

[0045] Material selection for the bristles is important here. The color of the indictor bristles 102 should be embedded within the material, not merely applied after the bristle 102 is fabricated, such as painting. The indicator bristles 102 cannot mark or discolor the vehicle 200 tires 201 in any way. As a result, the indicator bristles 102 will typically be extruded from a material consisting essentially a polymer selected from a list of PE, PP, and nylon, together with a colorant. In other words, the indicator bristles 102 may be PE; PP; nylon; or a composition of PE-PP; PE-nylon; PP-nylon; or PE-PP-nylon. The colorant, such as yellow or red, is embedded in the bristle 102 material prior to its extrusion. In this way, the material will not mark the tires 201 of the vehicle 200. From an economic perspective, the cleaning bristles 10, 11 can be made from the same materials with the addition of a black colorant, so that the extruded cleaning bristles 10, 11 are black.

[0046] The cylindrical rotary tire brush element with an integrated wear indicator 100 is comprised of a cylindrical body 19 having a cylindrical surface, a first end 18, a second end, at least a first plurality of cleaning bristles 10 of a first color and a first specified length 99; and at least a first plurality of indicator bristles 102 having a second color and a third specified length 97 arranged around and attached to the cylindrical body 19, which act as a wear indicator. The first plurality of cleaning bristles 10, 110 of a first color and a first specified length 99 and the first plurality of indicator bristles 102 of a second color and a third specified length 97 are tightly packed and cover almost the entirety of the cylindrical body 19. The first plurality of indicator bristles 102 having a second color and third specified length 97 are typically arranged in a narrow radial band.

[0047] FIG. 7 is a perspective view of a representative first embodiment of the present invention, a cylindrical rotary tire brush element with integrated wear indicators 100. The present invention 100 has a length 12. Starting at the bottom of the figure, there is a collar 13 with an opening 74 to receive a spindle. The present invention 100 is designed to spin on its axis 75. Starting at the bottom of the figure, the present invention has a cylindrical body 19 populated with a first plurality of cleaning bristles 10 of a first color and a first specified length 99; followed by a first plurality of indicator bristles 102 of a second color and a third specified length 97; followed by a second plurality of cleaning bristles 110 of a first color and a first specified length 99; followed by a second plurality of indicator bristles 202 of a second color and a third specified length 97; followed by a third plurality of cleaning bristles 210 of a first color and a first specified length 99; followed by a third plurality of indicator bristles 302 of a second color and a third specified length 97; followed by a fourth plurality of cleaning bristles 310 of a first color and a first specified length 99; followed by a fourth plurality of indicator bristles 402 of a second color and a third specified length 97; followed by a fifth plurality of cleaning bristles 410 of a first color and a first specified length 99. The pluralities of indicator bristles 102, 202, 302, 402 are arranged in narrow bands nested between pluralities of cleaning bristles 10, 110, 210, 310, 410. This arrangement can be extended to create a cylindrical rotary tire brush element with integrated wear indicator 100 of any length 12. In the first embodiment of the present invention 100, the pluralities of cleaning bristles 10, 110, 210, 310, 410 of a first color and a first specified length 99 are longer in length than the pluralities of indicator bristles 102, 202, 302, 402 of a second color and a third specified length 97. In other words, the first specified length 99 is greater than the third specified length 97. The pluralities of cleaning bristles 10, 110, 210, 310, 410 of a first color and first specified length 99 have a first minimum acceptable actual length for the bristles 10, 110, 210, 310, 410. The length 97 of the first plurality of indicator bristles 102, 202, 302, 402 of a second color and third specified length 97 are equal in length to the first minimum acceptable actual length of the pluralities of cleaning bristles 10, 110, 210, 310, 410 of a first color and a first specified length 99. In use, as the pluralities of cleaning bristles 10, 110, 210, 310, 410 of a first color and first specified length 99 contact tires 201 and rims, the bristles 10, 110, 210, 310, 410 will repetitively shear, losing a small amount of material off of their tips. As the actual length of the pluralities of cleaning bristles 10, 110, 210, 310, 410 of a first color and first specified length 99 diminishes with use, the pluralities of indicator bristles 102, 202, 302, 402 of a second color and a third specified length 97 becomes more pronounced. When the bristles 10, 110, 210, 310, 410 of the pluralities of cleaning bristles 10, 110, 210, 310, 410 of a first color and a first specified length 99 are equal in actual length to the length of the pluralities of indicator bristles 102, 202, 302, 402 of a second color and a third specified length 97, it is time to change the cylindrical rotary tire brush element 100. In other words, the third specified length 97 is equal to the first minimum acceptable actual length.

[0048] The bristles 10, 110, 210, 310, 410 of the pluralities of cleaning bristles 10, 110, 210, 310, 410 of a first color and first specified length 99 are typically black or charcoal gray. Cleaning bristles 10, 110, 210, 310, 410 of a first color make up the vast majority of bristles in the present invention 100. The pluralities of indicator bristles 102, 202, 302, 402 of a second color and third specified length 97 are bright yellow in color. The pluralities of indicator bristles 102, 202, 302, 402 of a second color and third specified length 97 are arranged in narrow bands between the pluralities of 10, 110, 210, 310, 410 of a first color and first specified length 99. In an alternative embodiment, the second color can be bright red. In yet another alternative embodiment, the second color can be bright orange. In yet another alternative embodiment, the second color can be a bright green. In yet another alternative embodiment, the second color can be white. Although the second color could conceivable be blue, purple, or even brown, these colors do not work as well from a visual contrast point of view.

[0049] FIG. 11 shows a second embodiment 200 of the present invention 200. Specifically, FIG. 11 shows the present invention 200 being applied to a stepped wheel brush 200. FIG. 11 shows a front isolation of the second embodiment of the present invention 200, with a first plurality of cleaning bristles 10 of a first color and first specified length 99; a second plurality of cleaning bristles 110 of a first color and a first specified length 99; a first plurality of indicator bristles 102 of a second color and a third specified length 97 arranged in a narrow band between the first plurality of cleaning bristles 10 of a first color and first specified length 99 and the second plurality of cleaning bristles 110 of a first color and a first specified length 99. To the right of the first plurality of cleaning bristles 10 of a first color and first specified length 99 is a first plurality of cleaning bristles 11 of a first color and a second specified length 98. To the left of the second plurality of cleaning bristles 110 of a first color and first specified length 99 is a second plurality of cleaning bristles 111 of a first color and a second specified length 98. In use, the first plurality of cleaning bristles 10 of a first color and first specified length 99 and the second plurality of cleaning bristles 110 of a first color and first specified length 99 would wear at approximately the same rate, slowly losing length due to repetitive contact with the tires of vehicles. When the actual length of the first plurality of cleaning bristles 10 of a first color and first specified length 99 and the second plurality of cleaning bristles 110 of a first color and first specified length 99 is, on average, equal to the third specified length 97, that of the first plurality of indicator bristles 102 of a second color and a third specified length 97, the first plurality of indicator bristles 102 of a second color and a third specified length 97 will become highly visible indicating that replacement of the present invention 100 is required. The tips of the pluralities of cleaning bristles 10, 110 of a first color and first specified length shear off before the tips of pluralities of cleaning bristles 11, 111 of a first color and a second specified length, because the first specified length 99 is longer than the second specified length 98. The various pluralities of cleaning bristles 10, 11, 110, 111 and indicator bristles 102 are homogeneous pluralities, meaning that all of the bristles of a plurality share a common purpose (cleaning or indicator), a common color, a common material, and a common specified length.

[0050] FIGS. 8-10 show one common method for fabricating the present invention 100, 200. FIG. 8 shows a cylindrical body 19 to which is attached a u-channel 101 containing bristles. The u-channel 101 containing bristles is wrapped in a tight helix on the cylindrical outer surface 109 of the cylindrical body 19. The collar 13 of the cylindrical body 19 is also visible. The u-channel 101 is welded 119 to the cylindrical outer surface 109 at the edge 25 of the cylindrical outer surface 109.

[0051] FIG. 9 shows a cross-section view, showing the cylindrical outer surface 109 to which the u-channel 101 is attached. There are two successive turns of the tight helix visible in this view. The cleaning bristles 10 of a first color and first specified length 99 are captured in the u-channel 101 using a retention member 120. The u-channel 101 is crimped around the bristles 10 and retention member 120. The retention member 120 can be a fashioned using metal or polymers. The retention member 120 is a flexible cylinder which can be compressed when the u-channel 101 is crimped.

[0052] FIG. 10 shows an isolation of an assembly 300 comprised of a u-channel 101 containing a first plurality of cleaning bristles 10 of a first color and first specified length 99, followed by a first plurality of indicator bristles 102 of a second color and third specified length 97, followed by a second plurality of cleaning bristles 110 of a first color and first specified length 99. This assembly 300 is wrapped around the cylindrical outer surface 109 of the cylindrical body 19 in a tight helix, creating the present invention 100.