Noise levels are high in an assembly plant of the car maker. Just-in sequence trolleys for plant-internal transport of vehicle parts are continuously moving over the concrete floor. The floor in the hall is in fact smooth, but it is regularly punctuated by expansion joints featuring cast iron gratings.
The trolleys used are still equipped with competitor castors with non-marking grey elastic solid rubber wheels. Because these castors have been in use for some time and the rubber treads are relatively hard, the manoeuvrability is not optimal due to the relatively high rolling and swivel resistance. The noise produced by moving the just-in sequence trolleys also exceeds the specified noise protection standards. The foot guard of the castors, which is attached for safety reasons, comes into contact with the floor during crossing of the expansion joints, resulting in a short lifespan for this accessory part.
The customer would therefore like a new castor solution with significantly lower rolling and swivel resistance as well as a tread with particularly low noise properties. The spacing of the also desired foot guard to the floor must prevent contact when crossing the thresholds.