초록 ▼

A coffee extracting apparatus for a coffee machine, which allows easy extraction of coffee liquid and easy removal of coffee grinds, is disclosed. The coffee extracting apparatus includes a machine case, a hopper receiving coffee grinds, a cylinder unit disposed below the hopper and rotated within a

A coffee extracting apparatus for a coffee machine, which allows easy extraction of coffee liquid and easy removal of coffee grinds, is disclosed. The coffee extracting apparatus includes a machine case, a hopper receiving coffee grinds, a cylinder unit disposed below the hopper and rotated within a certain angle range, a upper piston movably inserted in the cylinder unit and having a hot water path therein, a lower piston inserted in the cylinder unit to press coffee grinds against the upper piston and having coffee discharge paths therein, cam and link members to guide movement of the cylinder, the upper piston and the lower piston, and a drive unit mounted on the machine case to supply driving force to the cam members. The coffee extracting apparatus is easily removed from the coffee machine. A unit amount of coffee liquid is extracted every revolution of the drive unit. Since hot water to be mixed with coffee grinds is supplied to the lower piston from the upper piston, adhesion of coffee grinds on a bottom surface of the upper piston is avoided.

대표청구항 ▼

What is claimed is: 1. A coffee extracting apparatus for a coffee machine, comprising: a case, a cylinder unit having a cylinder, in which coffee grinds are received; an upper piston unit having a hot water path to guide hot water toward the cylinder; a pair of first guide pins symmetrically formed

What is claimed is: 1. A coffee extracting apparatus for a coffee machine, comprising: a case, a cylinder unit having a cylinder, in which coffee grinds are received; an upper piston unit having a hot water path to guide hot water toward the cylinder; a pair of first guide pins symmetrically formed on both sides of the upper piston unit and a pair of second guide pins symmetrically formed on both sides of the upper piston unit to be spaced from the first guide pins by a certain distance; and a lower piston received in the cylinder unit to be moved upward and downward, and having a discharge path to discharge coffee liquid produced by mixing coffee grinds and hot water, and wherein the case includes a pair of first guide holes to guide the first guide pins of the upper piston unit, and a pair of second guide holes to guide the second guide pins of the upper piston. 2. The coffee extracting apparatus as set forth in claim 1, further comprising: a hopper removably mounted on a case constituting a body of the coffee machine, into which coffee grinds are poured; a plurality of cam members and a plurality of link members to guide movement of the cylinder unit, the upper piston unit and the lower piston; and a drive unit fixedly mounted on the machine body to supply driving force to the plurality of cam members; wherein the cylinder unit is disposed below the hopper to be rotated within a certain angular range, wherein the upper piston unit is disposed over the cylinder unit to be rotated, and to be raised and lowered. 3. The coffee extracting apparatus as set forth in claim 2, wherein the plurality of cam members include a first cam member connected to the drive unit to be rotated, and a second cam member coaxially connected to the first cam member and rotated therewith, and wherein the plurality of link members include a first link members connected s between the first cam member and the upper piston unit to guide movement of the upper piston unit, a second link member connected between the second cam member and the lower piston to guide movement of the lower piston, and a third link member connected between the second cam member and the cylinder unit to guide movement of the cylinder unit. 4. The coffee extracting apparatus as set forth in claim 3, wherein the first link member includes a first hinge portion to allow the first link member to be connected to the first cam member, and a second hinge portion fitted on 20 one of the pair of first guide pins. 5. The coffee extracting apparatus as set forth in claim 4, wherein the first cam member includes a hinge protrusion at a side thereof to be fitted into the first hinge portion of the first link member, and wherein the drive unit includes a transmission member, which is connected to the drive unit at one end thereof and engaged to the hinge protrusion of the first cam member at the other end thereof. 6. The coffee extracting apparatus as set forth in claim 3, wherein the second s cam member includes a first guide path at one side thereof to guide movement of the second link member, and wherein the second link member includes a third hinge portion rotatably connected to the case, a fourth hinge portion hingedly connected to the lower piston, and a first guide protrusion moved along the first guide path to move the second link to member. 7. The coffee extracting apparatus as set forth in claim 6, wherein the lower piston has a lower open end, through which a connecting rod is fixed to the lower piston, the connecting rod being hingedly connected to the fourth hinge portion at a lower end is thereof. 8. The coffee extracting apparatus as set forth in claim 7, wherein the cylinder includes a lower end having an opening, the lower end being provided around the opening with an extension, which is extended to be perpendicular to the lower end. 9. The coffee extracting apparatus as set forth in claim 3, wherein the cylinder unit includes a third guide pin protruded therefrom by a certain length, and the case includes a third guide hole to guide the third guide pin of the cylinder unit, wherein the second cam member includes a second guide path at one side thereof to guide movement of the third link member, and wherein the third link member includes a fifth hinge portion hingedly connected to the case, a sixth hinge portion hingedly connected to the third guide pin of the cylinder unit, and a second guide protrusion moved along the second guide path of the second cam member to move the link member. 10. The coffee extracting apparatus as set forth in claim 2, wherein the hot water path includes a hot water feeding path therein. 11. The coffee extracting apparatus as set firth in claim 11, wherein the hot water path includes a plurality of hot water discharge paths, which allow hot water passed through the hot water feeding path to be discharged toward the cylinder unit. 12. The coffee extracting apparatus as set forth in claim 11, wherein the plurality of hot water discharge paths are radially and outwardly inclined by a certain angle so as is to allow the hot water to be discharged in a skirt pattern. 13. The coffee extracting apparatus as set forth in claim 2, wherein a lower end of the upper piston unit, which faces the lower piston, is provided with a first filter having a plurality of fine holes so as to allow coffee liquid to pass therethrough while preventing 20 coffee grinds from passing therethrough. 14. The coffee extracting apparatus as set forth in claim 2, wherein an upper end of the lower piston, which faces the upper piston, is provided with a second filter having a plurality of fine holes so as to allow coffee liquid to pass therethrough while allowing 2s coffee grinds to be caught thereby. 15. The coffee extracting apparatus as set forth in claim 2, wherein the discharge path includes a coffee discharge path formed on the lower piston, and a coffee discharge j pipe provided at the cylinder unit to communicate with the coffee discharge trough, s thereby allowing coffee liquid to be discharged to the outside. 16. The coffee extracting apparatus as set forth in claim 2, wherein the coffee discharge path is defined by a trough longitudinally formed on an outer surface of the lower piston.