GB1493614A - Aerosol dispensers - Google Patents

Abstract

1493614 Spray producers CIBA-GEIGY AG 31 Oct 1974 [31 Oct 1973 (4) 29 Nov 1973 (2) 26 March 1974 (2) 4 Oct 1974] 47181/74 Heading B2F An aerosol dispenser comprises at least one container for a liquid product to be dispensed at least one source of propellant, the source being separate from the container, and a nozzle arrangement comprising a spray nozzle having a central nozzle passage therethrough from an inletend to a discharge end of the nozzle, the central nozzle passage comprising (i) a first portion having a constant diameter portion, (ii) a diverging second portion of cross-sectional area everywhere greater than, or equal to, the cross-sectional area of the junction of portions (i) and (ii), and (iii) at least one inlet passage in the nozzle, opening into the central nozzle passage. Flowpaths are provided for the liquid product from the container to the nozzle and for propellant from the source to the nozzle, together with valves for controlling flow through the flowpaths, wherein the valves are controlled by actuating means which admit liquid product flow to the nozzle at a higher pressure than the propellant flowing to the nozzle, the liquid product being pressurized by liquidpressurizing piston means associated with the container or with the liquid product flowpath upstream of the valve controlling liquid product flow. In Fig. 4, the dispenser comprises a main body 20, liquid product held in a flexible sac 24 within a container 21 at its upper end flowing through an outlet passage 48a to a check valve 45, 46 and thence to a liquid pressurizing space 32a. At the lower end of body 20 is located an air compressing pump 25, comprising a piston 27 within a bore 26a, the piston being guided by an integral sleeve 28 axially reciprocable on body 20. In operation, reciprocation of parts 21, 28 towards each other causes air to be compressed in bore 26a; towards the end of the stroke of the piston 27 an actuating pin 30 on piston 27 lifts an obturating member from a seat 15a in space 32a, allowing air to pass to a nozzle 3 in the body 20. Obturating member 15 is retained on a piston 34 slidable in space 32a; upward movement of piston 34 in space 32a in response to upward movement of sleeve 28 causes liquid product to be compressed in the space 32a, the liquid product flowing through bores 39, 39a to the nozzle 3 when the pressure is sufficient to lift a sealing gasket 41 from its seat on bore 39a. In Figs. 6. 7 (not shown) liquid product flows through bores (32d), (58) to a nozzle passage (55), while compressed air flows into a cup-shaped space (51) surrounding the member having bore (58) to a nozzle (50). There are two separate obturating members (15), (57) for controlling liquid product and air flow to the nozzle. In Figs. 8. 9 (not shown) obturating members (15), (70) are retained on a single piston (67). In Figs. 11-12 (not shown) a liquid product pressurizing niston integral with a container closure (23) is reciprocable within a cvlinder (147b), the cvlinder (147b) being keved to a body (147a) containing a nozzle (90). Liquid product flows from the cylinder (147b) to the nozzle (90) via a bore (141) closed by a sealing gasket (143) in the cylinder. In Fig. 13 (not shown) a cylinder (177) has an extension at its lower end, the extension having the bore (141) closed by the sealing gasket (143). In Figs. 14-19 (not shown) a main body (310) has a liquid product container (311) at its upper end and an air-compressing pump (312) at its lower end. Liquid product is pressurized by the container (311) moving against a hollow fixed piston (315a), flow of liquid product and air to nozzle (327), of Venturi type, being controlled by a slidable valve stem (340) having obturating members (336), (339a). In Figs. 20-23 (not shown) the liquid-pressurizing means are associated with a container (410), liquid product flows to the central passage of a nozzle (433) while compressed air is fed to the nozzle through transverse openings (434a). In Figs. 24-25 (not shown) liquid product passes to a nozzle via passages 510 while air is fed through a transverse bore (516). In Figs. 26-27 (not shown) compressed air is fed to both the central bore of a nozzle (625) and a transverse passage or passages (631). In Fig. 28 (not shown) compressed air and liquid product are fed to transverse openings, the central bore being closed off. In Fig. 29 (not shown) the arrangement is similar to Fig. 23 except that liquid product and air are admitted to the transverse openings in the nozzle and air only to the central nozzle passage. In all of the embodiments, on cessation of spraying, any liquid product remaining in the nozzle is purged therefrom by the propellant.