DOUBLE-SPRING PRECOMPRESSION PUMP WITH FILLING-IN FEATURE Russian patent published in 2004 - IPC

FIELD: pumping device for dosed delivery of personal hygiene products.

SUBSTANCE: pump has inlet valve actuated by gravitational force and spring-biased outlet valve. Increased pressure in pumping chamber causes outlet valve to open against shifting of outlet valve spring. At least one outlet valve or one inlet valve is equipped with contact end, which is brought into contact engagement with other valve at lower point of stroke of pump piston for opening of outlet valve against shifting of outlet valve spring and discharging of air and liquid from pumping chamber toward spraying nozzle. In this case, said chamber is emptied so that liquid may be sucked into pumping chamber from bottle or vessel. Double-spring pump may be produced by simple injection molding process without observing strict allowances and may operate without use of frictional fitting, which is difficult to provide in case of injection molding.

EFFECT: simplified construction and enhanced reliability in operation.

49 cl, 17 dwg