Patent ID: 6431055
Filing Date: 2002-08-13
Classification: A47J

Abstract:
An automatic espresso coffee dispensing unit comprisinghot water delivery means (2); an annular body (15) axially movable in respect of said water delivery means; a first hollow piston (7) axially movable in respect to said annular body, comprising a jacket (73) suitable to enter the central hole of said annular body; the first hollow piston being provided by first elastic means (72) to maintain said first hollow piston in a position far from said water delivery means, and second elastic means (16) to maintain said first hollow piston in a position far from said annular body; said jacket comprising a compartment (47) for containing coffee powder or a capsule, and being suitable to contact sealedly said delivery means; said first hollow piston (7) being sealedly movable into the cavity of a fixed hollow body (5, 50) to create a variable volume chamber; said chamber being connected via a two- or three-way valve alternately to a pressurized water source and to discharge; a second piston being sealedly movable into said jacket by third elastic means; said second piston comprising a perforated plate (94) communicating with the outside via a duct for draining brewed coffee, and a pawl (17) securely fixed to the first hollow piston and removably and elastically inserted into a seat provided in the annular body.