Patent ID: 6817491
Filing Date: 2004-11-16
Classification: B05B

Abstract:
A discharge container for discharging a liquid received within a container to an external portion from a discharge port on the basis of a pump operation comprising:a cylinder within which a liquid is charged; a first piston slidably provided within said cylinder and urged in a backward moving direction by a first spring; a second piston slidably provided within said cylinder and backward moving while compressing a second spring when the liquid within said cylinder is pressed by said first piston; an inflow port for flowing the liquid from the inner portion of said container to an inner portion of said cylinder; an inflow valve provided between said inflow port and said container, passing the liquid flowing into said cylinder and shutting an outflow of the liquid from the inner portion of said cylinder; an outflow port for flowing the liquid to the external portion from the inner portion of said cylinder; and a liquid passage connecting said outflow port to said discharge port, wherein said cylinder has a small diameter portion having a small inner diameter, a large diameter portion k having a large inner diameter and a step portion corresponding to a boundary therebetween, said first piston is provided within said small diameter portion, said second piston is provided within said large diameter portion so as to oppose to said first piston, said outflow port is formed near a front end portion of said first piston so as to direct to a sliding surface with said cylinder, said liquid passage is connected to said discharge port through said first piston, said inflow port is provided so as to pass through said second piston, said first piston is urged in a direction moving apart from said second piston by said first spring, said second piston is urged by said second spring so as to be brought into contact with said step portion, wherein while said first piston moves at a predetermined stroke, said outflow port is closed, and said second piston moves backward while pressing and compressing said second spring by the liquid existing between said first piston and said second piston, and wherein when said first piston moves over the predetermined stroke, said outflow port is opened, said second piston is pressed back to said second spring and the liquid within said cylinder is discharged to the external portion via said outflow port, said liquid passage and said discharge port due to an urging force of said second spring.