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A conventional injection group comprises a massive, metal injection block 49 with a plan interior surface having a central projecting interface 50 formed in part of the central portion and then machine-finished. On this projection 50, which serves as both a connecting unit and a mechanical means for packing coffee grounds, is a diffusion unit com¬monly known as a spray 51.
Injection block 49 is a massive support 52, for example made of brass, connected to the rest of the circuit by a belt 53 and there is an inlet 54 penetrating the support for the passage of hot water to the spray through central interface projection 50.
The lower plan surface of the injection block serves as a support for a female element usually called a cup-holder 55, that is, a screwed-on piece for mounting a container 56 with a handle 57 designed to hold a strainer 58 for the ground coffee which will be brewed by the drip method.
Strainer 58, held by container 56, is attached to central projection 50 so the ground coffee can be lightly packed inside. In the conventional version, a seal is formed between projection 50 and strainer 58 using a fiat gasket or, in an original but known manner, using a toric gasket 59 as shown in FIGS. 4 and 5.
According to the present invention, the injection group is unique first because it lacks the massive, onerous, metal mechanical support 52 constituting injection block 49 and, as a result, holder 55 can be attached directly to the subsurface of the lower plate 12 of the front portion 11; and also because central projecting interface unit 50 is formed of an assemblage of elements, as will be shown below.
Holder 55, which will be attached to container 56, is solidly attached directly to the lower plate 12 of the sub¬surface of front portion 11.
It is attached firmly in order to withstand the maneuvers involved in attaching or removing container 56 with its holder 55.
Another feature of the simplified injection group, accord¬ing to the invention, is the direct connection of the water
inlet on the interface and injection unit, and the existence of the hydropneumatic storage hydraulically connected to the interface and injection unit.
With reference to FIGS. 5 through 7, each injection and interface group in the coffee machine, consisting of several juxtaposed functionally independent units, is composed of inpidual elements, removable in succession, located between the strainer 58 and the subsurface of lower plate 12 of front portion 11.
First there is an injection piece 60 which transmits hot water to the coffee through the diffuser or spray element 51. The spray element is attached to the front portion, perhaps by a screw 61. A plurality of longitudinal canals 62 open through this front portion for the passage of water through the injection piece, with canals 62 communicating upward with an upper annular distribution chamber 63 supplied with hot water by flexible conduit inlet 47 and hydraulically connected with a hydropneumatic storage 64 through an intermediate piece (FIG. 7).
Hydraulic connections 65 and 66, which exist not only between hydropneumatic storage 64, electrovalve 48 and the next injection group thus formed, but also between electro-valve 48 and that injection group, are also made of flexible tubes, preferably thermally insulating plastic, with the injec¬tion ends connected to the interface and injection unit by connectors 67, 68, which may have one threaded portion meshing with the other portion.
This injection element 60 also seals the strainer, perhaps by using a peripheral groove 69 with a toric seal 59 on the lateral surface, as shown in FIGS. 4 and 5.
The interface and injection unit is attached to lower plate 12 using an intermediate piece called the crosspiece 70 which functions as a support and a contact, formed of a disc applied to the lower plate 12 of the subsurface of front portion 11 and attached to this plate by a screw-pin connec¬tion 71.
Crosspiece 70 has an interior threaded portion 72 toward the bottom of its central portion, which receives screw 61 attaching spray element 51.