System for improving the gripping power of a vehicle wheel on a support

A system for improving the gripping power of vehicle wheels on a surface, comprising nozzles near the wheels supplied with a liquid from a container and means for controlling the liquid supply, characterized in that:

• said container holds a liquid which in the winter enhances the gripping power of the wheels on a winter slippery surface,
• said system includes a compressor for using the air therefrom for applying the liquid and for cleaning the nozzles,
• said container is connected with a dosing means for dosed application of the liquid,
• said dosing means comprises:
• first conduit means connecting said compressor to said container for forcing liquid therefrom to said nozzles, valve means controlling the supply of liquid from said container to said nozzles, second conduit means connecting said compressor directly to said nozzles for cleaning the same, and a timing relay with two different time adjustments, a first timing interval guiding compressed air to said container and opening said valve means to supply said liquid to said nozzles and a second time interval longer than said first time interval guiding compressed air directly to said nozzles to clean the same after the supply of liquid thereto has been shut off by the closing of said valve means.