Abstract:
The device has a timing system which consists of two chambers interconnected by a constricted passage and by a quick opening valve one chamber being permanently filled with a timing fluid, advantageously a liquid. A flexible member having means providing snap action forms the wall between one of these chambers and a discharge chamber from which pressure fluid is ejected to the atmosphere. Pressurized fluid from a pressure pack, such as an aerosol container, passes first to a metering chamber and then to the surface of the flexible member by which it is ejected through a discharge outlet.