| 摘要 |
PURPOSE: To remarkably reduce the abrasion of a packing of a coffee pouring piston in an automatic coffee maker. CONSTITUTION: During the operation of a coffee pouring piston in a coffee pouring chamber, an annular packing forms air-tightness between the coffee pouring chamber and the coffee pouring piston. The coffee pouring piston is divided into two parts 7', 7", which enter each other, resisting the work of an opposite spring, and the first part 7' of the coffee pouring piston, which enters the coffee pouring chamber 5, is formed into a flat first seat vertical in the approaching direction of the coffee pouring piston in relation to the packing ring, and the second part 7" of the coffee pouring piston, which enters the coffee pouring chamber thereafter, is formed into a conical seat in relation to the packing ring. Diameter of the seat is increased with the reduction of a space between the two parts 7', 7" of the coffee pouring piston of the coffee pouring chamber. |
