Patent ID: 7717027
Filing Date: 2010-05-18
Classification: A47J

Abstract:
1. A beverage extractor comprising: a cylinder for accommodating a raw material; a piston disposed to be movable within the cylinder; an electric motor for moving the piston relative to the cylinder; a hot water feed pipe for supplying hot water into the cylinder; an extraction pipe for causing a beverage extracted in the cylinder to flow out; a first extraction channel for causing the beverage extracted in the cylinder to flow into the extraction pipe via a hole of a prescribed first bore; a second extraction channel for causing the beverage extracted in the cylinder to flow into the extraction pipe via a hole of a prescribed second bore, which is smaller than the first bore; and a channel switching mechanism for switching over the first extraction channel and the second extraction channel between each other by the motor, the channel switching mechanism is linked to the piston, wherein said piston has a piston rod which is inserted into the extraction pipe to be movable within the extraction pipe and has the extraction channels inside, and said channel switching mechanism includes the piston rod having a beverage outlet hole of the first bore in the circumferential face thereof, a pair of seal rings disposed with a space in-between in the direction of the center axis of the extraction pipe to seal the gap between the inner circumferential face of the extraction pipe and the outer circumferential face of the piston rod, and a communication channel provided with a channel of the second bore for letting the beverage flowing out of the beverage outlet hole flow from between the pair of seal rings to the extraction pipe on the downstream side between the seal rings.