Aerosol dispenser for fluid products comprising a piston pump assembly for generating compressed air

In an aerosol dispenser for fluid products comprising a container for product to be dispensed, a piston-cylinder pump means separate from the product container, and having piston and cylinder means, one of which is movable relative to the other which is fixed, for generating compressed air as a propellant, spray nozzle in which compressed air flowing therethrough aspirates, and sprays product from the product container, flowpaths, for compressed air from the pump means, and for product from the product container, to the spray nozzle, valve means comprising valve housing and displaceable valve bodies in the housing, and being associated with said flowpaths and opening the paths dependent on the movable means of said pump means approaching or reaching full compression stroke position in the fixed means of the aforesaid pump means, abutment means in the pump means acting, in the aforesaid compression stroke position, by direct mechanical contact on at least the valve body of the compressed air flow-controlling valve means;

• and a mounting for said spray nozzle and having a passageway therein which is part of said compressed-air flowpath;
• said product container and product flow control valve means being mounted on said mounting and said mounting being detachably connected to the fixed means of said piston and cylinder means, forming a mounting-piston assembly;
• and said fixed means being hollow and constituting the housing for the remaining parts of said compressed air controlling valve means;
• the improvement comprising
• a. flexible elastic wall means across said compressed air flowpath and separating the latter from the interior of said product container;
• b. product outlet means in the wall of said product container outside said flexible elastic wall means and being part of said flowpath for product to said spray nozzle;
• and
• c. a movable valve member mounted on said flexible elastic wall means and biased toward the closed position and having abutting means in an open end of said passageway in said mounting, and said valve body of said compressed air flow-controlling valve means having contact rod means extending through said passageway and engaging said abutting means of said product flow control valve means and thereby opening the product flowpath, when said abutment means in the piston pump acts on the valve body of said compressed air flow-controlling valve means.