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1. (WO2018024579) INFUSER UNIT FOR A COFFEE MACHINE

Pub. No.:    WO/2018/024579    International Application No.:    PCT/EP2017/068910
Publication Date: Fri Feb 09 00:59:59 CET 2018 International Filing Date: Thu Jul 27 01:59:59 CEST 2017
IPC: A47J 31/36
A47J 31/44
Applicants: DE' LONGHI APPLIANCES S.R.L.
Inventors: DE' LONGHI, Giuseppe
FRANZON, Floriano
Title: INFUSER UNIT FOR A COFFEE MACHINE
Abstract:
An infuser unit (1) for a coffee machine, comprising a closing piston (3) and an infusion cylinder (2) which are axially movable selectively or in combination for reciprocal engagement and disengagement so as to close and open an infusion chamber inside the infusion cylinder (2), in which a dose of coffee can be positioned, an ejection piston (5) engaged in the infusion cylinder (2) and axially movable in the infusion cylinder (2) so as to expel the spent coffee grounds, a first radial hydraulic sealing means between said closing piston (3) and said infusion cylinder (2), and a second radial hydraulic sealing means between said infusion cylinder (2) and said ejection piston (5), at least one between the first hydraulic sealing means and the second hydraulic sealing means comprising at least one seal (100, 101) having an anti-friction surface coating made of a material free of grease and lubricating oils and compatible with use in contact with foodstuffs and drinking water.