The present invention concerns a special wear indicator pin which is placed into an applied bore hole on the slightly uprising contour edge of a rotary sweeping dish brush mounted under a conventional sweeping machine. Said pin gives a clear indication of how far the wear of the dish brush has progressed in order to decide when to replace the old brush by a new dish brush. In practice, this is important for a good result of the sweeping activities on pavements.

The state of the art does not include an effective system for indicating the wear situation of a rotary sweeping dish brush. In practice it is very important to estimate the wear situation of said dish brush in order to achieve a good cleaning of the pavements. It happens to be an important issue to replace the worn-off dish brush in time. The usually known dish brushes do not have such an indication mark.

Object of the invention.

To eliminate the drawback of the non-indicating wear situation of dish brushes an effective wear indicator mark has been developed. The developed wear indicator mark or pin can be installed in the slightly uprising contour edge of the dish brush plate. See, for example, dish brush plate EP 19075004, filed 01-03-2019, titled: "Dish Brush for Sweeping Machines", applicant KOTI Onroerend Goed B.V., Weert, The Netherlands.

Wear indicator pin for rotary sweeping dish brushed, which are place or mounted at a rotating vertical driving axle under a conventional sweeping machine. The dish brush consists of a circular plate with a slightly uprising contour edge or rim, wherein at mutually equal tangential distances sweeping elements are fixed (welded) at the bottom side of said contour edge, characterized in that in the contour edge or rim between said sweeping elements with length L1,n extra bore holes are fixed with diameter D and wherein is pulled or installed a nail-formed coloured wear indicator pin, wherein said wear indicator pins have a pin diameter d1, a conical end diameter d2, a ring diameter d1, a nail head diameter d3 and an effective length L2, wherein L2 < L1, wherein the material of said wear indicator pin is made from a coloured plastic material.

The advantage is an excellent view on the wear situation of the rotary sweeping dish brushed mounted under a conventional sweeping machine shown from a side view. The dish brush can be replaced in time in order to achieve an optimal sweeping result.

Furthermore, the wear indicator pin as in claim 1 is further characterized in that said length L2 is between 1/6 L1 and 1/3 L1, preferably 1/5 L1. The advantage is an optimal use of the dish brush before replacement.

Then the wear indicator pin as in claim 1-2 is further characterized in that said n is between 1 and 4, preferably 1 or 2. The advantage is that the wear and tear of the dish brush can be seen from different sides.

Furthermore, the wear indicator pin as in claim 1-3 is further characterized in that said diameter d1 is about 95% of diameter D and that diameter d2 is about 110% of diameter D, being 6 mm. The advantage is a very easy and fast mounting or pulling of a wear indicator pin.

Then the wear indicator pin as in claim 1-4 is further characterized in that said nail head diameter d3 is 15 mm. The advantage is a very stable and strong mounting of the head of the wear indicator pin.

Furthermore, the wear indicator pin as in claim 1-5 is further characterized in that said plastic material is polyethylene, wherein said colour is chosen as yellow, red, green or blue. If required other colours can be chosen. The advantages are a strong, flexible (bending strength) product, executed as wear indicator pin, in different colours.

The embodiment of the wear indicator pin is mounted in the slightly uprising contour edge of rim of the circular plate of a dish brush according to the invention which will now be described below. This is by way of example with reference to the accompanying drawing with figures, in which:

• figure 1 shows an oblique projection of the rotary sweeping dish brush with sweeping elements and at least one wear indicator pin according to the invention;
• figure 2 shows a top view over the line II-II of the circular plate of a rotary sweeping dish brush with on wear indicator pin;
• figure 3 shows a cross section over the line III-III of figure 2 with only one wear indicator pin; and
• figure 4 shows an oblique side view of the wear indicator pin according to the invention.

Figure 1 shows an oblique projection of the rotary sweeping dish brush 1 with a circular plate and a slightly uprising contour edge or rime 3. The circular plate 2 has mounting or installation holes 4 for coupling to the vertical axle of a sweeping machine (not shown). Underneath through the L-formed openings 5 the sweeping elements 6 are welded under the contour edge or rim 3. The wear indicator pin 8 is pulled through a mentioned bore hole 7. The length L2 of said wear indicator pin 8 is between 70 mm and 110 mm depending on the diameter of the dish brush 1. The material itself is polyethylene and can be coloured yellow, red, green or blue. If required another colour can be chosen. The length L1 of the sweeping elements 6 is between 240 mm and 290 mm, preferably 270 mm. The length L2 will be about 90 mm, being 1/3 of L1.

Figure 2 shows a top view over the line II-II of figure 1 of the circular plate 2 and the slightly uprising edge or rim 3. Only one bore hole 7 is indicated for pulling through said wear indicator pin 8. In practice, more wear indicator pins 8 can be installed.

Figure 3 shows a cross section over the line III-III of figure 2. The same elements have the same numbers.

Figure 4 shows an oblique side view of the wear indicator pin 8 according to the invention. The same elements have also the same numbers. The diameter d1 is around 6 mm and the conical diameter d2 is around 7,5 mm. The nail head 9 has a diameter d3 of 15 mm. The bore hole diameter D with number 7 is 6,5 mm.

However, it is obvious that modifications to the aforementioned wear indicator pin 8 according to the invention can be made, but these shall remain within the field and scope of the invention.