Patent ID: 7931215

Claim:
A device for spraying a coating fluid, the device comprising a sprayer and a reservoir for feeding said sprayer with fluid, said reservoir comprising a body and defining a cylindrical housing in which there slides a piston forming a moving wall for a storage volume for storing the coating fluid, said housing being defined by a jacket received in said body that forms a support for said jacket, the device being characterized in that said jacket is provided with an end wall cooperating with the peripheral wall of said jacket and said piston to define said storage volume wherein said piston is in sliding contact with a peripheral wall of said jacket and wherein said jacket is provided with an end wall cooperating with said peripheral wall of said jacket and said piston in order to define said storage volume between said piston, said peripheral wall and said end wall and wherein said peripheral wall has a first thickness over the major fraction of its length taken parallel to the direction (X 9 ) in which said piston moves, and a second thickness in the vicinity of said end wall, said second thickness having a value that is greater than said first thickness.