Electrostatic paint spray apparatus having rotary spray head with an air seal

In an electrostatic paint spray apparatus including a body member, a shaft mounted for rotation in bearing means in the body member, a rotary spray-head mounted at one end of the shaft, an injection collar arranged around the shaft for distributing paint or solvent through a distributing ring protruding into said spray head;

• the improvement comprising an air seal adapted to be connected to a source of pressurized air and defining an air barrier against paint or solvent, said air seal including an air flow path running along the shaft axially intermediate the spray head and the bearing means and connected to barrier air venting means for venting barrier air to the surroundings before reaching the bearing means, and further comprising an annular air feed chamber connected to the upstream end of said air flow path which is defined between the shaft and a distribution sleeve operatively disposed between the injection collar and the spray head, an air inlet in the injection collar being adapted to be connected to said source of pressurized air and to said annular feed chamber via an annular distributing groove.