Piston for a beverage infusion automatic machine

Details Piston for a beverage infusion automatic machine Piston for a beverage infusion automatic machine

2004-12-29

2009-11-24

Alexander, Reginald L (Department: 3742)

Foods and beverages: apparatus

Beverage

Infusors

C099S297000

Reexamination Certificate

active

07621212

ABSTRACT:
A piston (11) of an automatic machine for infusion of beverages, such as coffee and the like, the piston having a piston head (13a,13b) divided into two parts connected together and axially movable relative to each other, an annular gasket (15) being housed between those parts and radially expanding when an axially directed thrust such as to make said two piston parts (13a,13b) approach each other is applied onto said piston (11), wherein the elastic resistance of said gasket (15) keeps said two piston parts (13a,13b) spaced apart when no axial thrust is applied onto the piston.

REFERENCES:
patent: 1002173 (1911-08-01), Naegelen
patent: 1523986 (1925-01-01), Schmidt
patent: RE18820 (1933-05-01), Olson
patent: 1921996 (1933-08-01), Hooydonk
patent: 2004618 (1935-06-01), Schmidt
patent: 2157039 (1939-05-01), Hooydonk
patent: 2409764 (1946-10-01), Jessup
patent: 2961278 (1960-11-01), Newhall
patent: 4796521 (1989-01-01), Grossi
patent: 6634280 (2003-10-01), Sowden et al.
patent: 7017474 (2006-03-01), Comte

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