The cartridges of the type taken into consideration have, in most cases, a rotary shutter member with an excentrical passage opening, which co-operates with a fixed seal packing and, under action of a rotary control member, is made to rotate between a position of complete opening and a po- sition of complete closure, through intermediate positions of regulation of the delivery rate. The main drawback of this structure resides in that the travel from the complete opening and the complete closure covers a very limited an- gular field, whereby the control of the delivery rate is difficult for the user and is little sensitive, because it needs to be done by means of very limited angu- lar displacements.

There are also known cartridges of the type taken into consideration, wherein two plates of ceramic material are installed, the one, unmovable, be- ing provided with an inlet opening and an outlet opening, and the other being movable in translation under action of a tilting control lever, and being pro- vided with a channel intended to connect the passage openings of the un- movable plate. In this case, by choosing a suitable ratio between the arms of the control member, it is possible to render the control sensitive enough.

However a drawback of these cartridges, which are of the closed type, resides in that the presence of two passage openings in the unmovable plate needs that these openings are disposed in an eccentric manner, and this involves providing complicated passageways in the faucet body for which the cartridge is intended. Moreover, the manufacture of such a cartridge is expensive due to the use of plates of ceramic material.

Therefore, the object of this invention is to find a remedy for all or a part of these drawbacks of the known cartridges, though preserving the re- spective advantages. More particularly, it is intended that the cartridge should afford an easy and sensitive control, that its manufacture cost should be limited, that its duration in use should be satisfactory, and that no compli- cate shape should be needed for the faucet body in order to allow installing

the cartridge.

This object is attained, according to the present invention, in a car- tridge for a one-way hydraulic faucet of the type having a plane shutter mem- ber, in that:-the cartridge includes a cartridge body having a bottom portion wherein there is hollowed a cylindrical seat housing a sleeve packing provided with elastic pushing means;-the plane shutter member is formed by a slide which is guided within the cartridge body for diametrical movement with re- spect to said body, is kept in operative contact with said sleeve packing, and shows an opening suitable for registering, in a position of the slide, to the passage of said sleeve packing, whereas the slide, in another position, closes said passage;-and said slide is kinematically coupled to an inner arm of a lever, which is pivoted in the cartridge body and whose outer arm forms the control member of the faucet.

Preferably, said slide is manufactured of a suitable plastic material.

Preferably, said sleeve packing is installed in the bottom portion of the cartridge body in a central position.

Thanks to these features, the control of the faucet may be rendered easy and sensitive by means of a suitable choice of the ratio between the two lever arms. Because the closure of the faucet is ensured by the sleeve packing, the slide does not need to be manufactured of an expensive material such the ceramics, on the contrary it may be made of a suitable plastics, whereby the manufacture of the cartridge is easy and cheap. Because such a cartridge is of the open type, the bottom of the cavity of the faucet body, in- tended to house the cartridge, only needs to have a passageway for water inlet, which moreover may be central, whereby there is no need for a compli- cated structure of the faucet body.

Preferably, said slide includes a thin protective sheet applied to its surface which co-operates with the sleeve packing. Said thin protective sheet may be of metal or it may be made of a synthetic material having high char- acteristics.

This way, the slide may be made of a particularly cheap plastics which, in view of its scarce characteristics, could not resist on the long time to the erosive action due to the water flow in the conditions of considerable throttle, but it is protected with respect to said erosive action by the thin pro- tective sheet, which is made of a more expensive material but in view of its

very little quantity does not have a considerable influence on the cartridge cost.

Preferably, the control lever is pivoted in the cartridge body by means of a spherical shape of an intermediate portion of the lever and a comple- mentary shape of a seat in the cartridge body, a suitable packing being pro- vided, preferably shaped as a so-called quadring.

These and other features, objects and advantages of the subject of the present invention will appear more clearly from the following description of an embodiment being a non-limiting example, with reference to the appended drawings, wherein: Fig. 1 shows the cartridge according to the invention in the closure position and in an axial cross section, transversal with respect to the direction of the slide movement, namely a section taken along line I-I of Figure 2; Fig. 2 shows the same cartridge in an axial cross section, longitudinal with respect to the direction of the slide movement, namely a section taken along line 11-11 of Figure 1; Fig. 3 shows the cartridge in a cross section corresponding to that of Figure 2, but in the position of complete opening; and Fig. 4 shows a transversal cross section of the cartridge, taken along line IV-IV of Figure 3.

The cartridge comprises a body 1 which, in this case, is made of a single piece with a bottom portion 2, and wherein are made openings 3 for the delivery of the water controlled by the cartridge; this cartridge is, therefore, of an open type. The bottom portion 2 is provided with a packing 5 intended to seal with respect to a water inlet channel, and in the shown embodiment it has some pins 4 intended for establishing the position of the cartridge when it is inserted in a faucet body (not shown). Different positioning means may be foreseen in different embodiments of the cartridge. In the bottom portion 2 there is hollowed a cylindrical seat 6, wherein is installed a sleeve packing 7, made of an elastomeric material and pushed by a spring 8.

In the cartridge body 1 is housed a plane shutter member having the shape of a slide, comprising a bottom part 9 with a passageway 11 and a top part 10 with a coupling seat 12. The passageway 11 is so disposed and sized that, in a position of the slide (Figure 2: opening position) the passageway 11 registers with the passageway of the sleeve packing 7, whereas in another

position of the slide (Figure 3: closing position) the passageway 11 does not communicate with the passageway of the sleeve packing 7, whereby this lat- ter is closed. As it may be understood, in the intermediate positions between the two described and shown, the passageway 11 registers only in part with the passageway of the sleeve packing 7, which therefore is not closed but is more or less throttled.

The slide 9-10 is axially kept in its position within the cartridge body 1 by means of an inner member 13, inserted in the body 1 and having tongues 14 which prevent its rotation. The inner member 13 is provided with project- ing portions 15, and between these latter is mounted the top part 10 of the slide 9-10, which in this way is guided for a diametrical movement with re- spect to the body 1. Moreover the inner member 13 has, opposite the projec- tions 15, a partially spherical seat 16.

On its turn, the inner member 13 is kept in its position within body 1 by a cover 17, which is mounted on body 1 in any way (for example by means of elastically snapping teeth, not shown, or by sticking or welding), which at its inner portion forms a partially spherical seat 18.

Between the partially spherical seats 16 and 18 there is seated the partially spherical intermediate portion 19 of a two-arm lever, whose inner arm 20 is coupled with the coupling seat 12 of the slide 9-10, whereas the outer arm 21 (usually provided with a lever, cap or handle, not shown) forms the control member for the faucet. A seal packing 22, for example of the type called"quadring", seals among the spherical portion 19 of the control lever and the spherical portions of the cover 17 and the inner member 13, respec- tively. In the shown embodiment, packing 22 is mounted in equatorial posi- tion with respect to the partial sphere 19, but in other embodiments it could be situated in different manners. As it may be understood, by causing the con- trol member 21 to tilt, the slide 9-10 is caused to displace diametrically and therefore the flow traversing the faucet is controlled.

When the passageway 11 of the slide 9-10 closes in an about com- plete manner the passageway of the sleeve packing 7, the water flow is highly throttled and it assumes a great speed and erosive capacity, which is applied to the rims of passageway 11. In order that these rims are not damaged, the slide 9-10 may be manufactured of a high quality plastics, such as those based on polysulfones. However such plastics are somewhat expensive.

Therefore, in certain cases it is preferable to use for the slide 9-10 a cheap plastics, and provide its surface intended to co-operate with the sleeve pack- ing 7 with a thin sheet of a material suitable for resisting to the erosion, fixed to the slide. This thin sheet may be made of a high quality plastics or, pref- erably, by a thin sheet of metal, for example stainless steel.

As it may be understood from the above, the cartridge according to the present invention collects together substantially all the advantages of the different types of known cartridges, by obviating most of their drawbacks; it is easy to use, has a considerable control sensitivity, is relatively cheap in ma- nufacture and does not raise particular installation problems. Moreover it is easy to design the same in order to satisfy different installation requirements.

An advantage afforded by the cartridge according to the invention re- sides in that, particularly when its inlet opening is in a central position, it may be mounted in a body of simple shape, which may replace the usual screwed upper part of an existing faucet.

It should be realized that the invention is not limited to the embodi- ment which has been described and shown as an example. Some possible changes have been described, and other are within the skill of any technician.

For example, the bottom part 2 of body 1 could be applied to the body instead of being integral therewith; the sleeve packing 7 may be mounted, when needed, in a non-central position; it may be pushed by an elastic member different from a spring, or even by its own elasticity ; the shape of slide 9-10 may be chosen in various manners; its diametrical guidance within the car- tridge body may be obtained in different manners; and the control lever may be pivoted in any manner different from a partially spherical intermediate por- tion.

These and other changes and any replacement by technically equivalent means may be introduced without departing from the spirit of the invention and the scope of this Patent.