US Patent 7140485 Lubrication device for endless belt of treadmills

A lubrication device for a treadmill includes a plurality of dispensing tubes connected between two rails of the frame and a plurality of apertures are defined through a wall of each dispensing tube. The dispensing apertures face an inside of the endless belt located at a lower position. A plurality of input tubes are connected the two ends of the dispensing tubes so that lubricant can be fed into the dispensing tubes via the input tubes such that the inside of the endless belt is lubricated. The customer can easily lubricate the endless belt without removing the endless belt from the frame.