Automatic air vent device for cup of cylindrical or truncated shape paint spray gun, has crossing vent opening released from projection for inlet air passage in cup for realizing venting function during gun bending operation

摘要

The device has a flexible bottom wall (3) placed on a part of a flexible surface and provided with a crossing vent opening (5). The flexible part of the surface is doubled by a rigid closing wall (6) with an air passage and provided with a closing projection (8) corresponding in position to the opening. The opening is released from the projection for an inlet air passage (7) in a cup (1) for realizing venting function during a gun bending operation caused toward interior of the cup of the surface of the wall.