| 摘要 |
The invention relates to a mechanically and hydrodynamically operated brewing unit ( 1 ) for automatic beverage vending machines, comprising a rotatable base ( 3 ) provided with a compartment ( 15 ) that acts as a brewing chamber, means to let water under pressure into said compartment, means to connect said compartment with the point at which the brewed beverage is dispensed, and a brewing head ( 4 ). This brewing head is comprised of a hollow containment structure ( 279 , a first hollow piston ( 28 ) that is housed in said containment structure movably relative thereto, a second piston ( 29 ) that is accommodated in said first piston movably relative thereto, and elastic means ( 30 ) contrasting the movement of said second piston. The brewing unit is characterized in that said first piston and said second piston are operated by the direct action of a fluid under pressure.
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