WO2003077717A1

WO2003077717A1 -

Info

Publication number: WO2003077717A1
Application number: PCT/IT2002/000177
Authority: WO
Priority date: 2002-03-20
Filing date: 2002-03-20
Publication date: 2003-09-25

Description

"Whole fruit electric juicer" * * * * *

DESCRIPTION

The present invention relates to a whole fruit electric juicer.

In the present description and in the attached claims, the term "juicer" is used for clarity, without however any limiting intent. As it shall be clear later on, the juicer of the invention is, indeed, also useful for juicing raw or cooked fruit and vegetables other than citrus fruits. In the same way, the terms "citrus fruit" and "fruit" should not be construed in a limiting sense.

Various types of juicers are known. Most juicers for domestic use provide a static or rotating, substantially cone-shaped member, upon which half a fruit is juiced at a time .

In the industrial field, for example for pubs and the like, whole fruit juicers are also known, in which the fruit is fed without cutting it in half. The juice obtained is conveyed through an outlet spout into a suitable container, such as directly into a glass, whereas the rind is separated and collected in a second suitable container.

The present invention regards such a whole fruit juicer for domestic and industrial use.

More specifically, an industrial whole fruit juicer is known which comprises a pair of upper rollers and a pair of lower rollers, rotating about respective horizontal axes. The upper rollers have a substantially circular cross section, with spherical dome-shaped grooves distributed along their side surface. Interposed between the two upper rollers, in the area of minimum distance, there is a vertical blade. The lower rollers have a lobed, for example trefoil-like cross section. The lower rollers are sized and arranged so that their lobes loosely insert into the spherical dome-shaped grooves of the upper rollers.

The upper rollers rotate in opposite directions, towards the blade, whereas the lower rollers rotate in opposite directions, away from the blade. The citrus fruit, left to fall into the area of the upper rollers, is dragged by two grooves of the upper rollers towards the blade and is cut in half thereby. Each half then continues to be dragged by the groove of the respective upper roller and is juiced on a lobe of the respective lower roller. The juice is collected in the central zone below the lower rollers, whereas the rind is removed by falling.

Such a known juicer, although functional, has various drawbacks. Firstly, it is bulky, practically precluding a domestic use thereof. Secondly, its assembly is fairly critical since it is necessary to guarantee the correct mutual orientation of the rollers so that time after time there is a pair of grooves facing one another at the blade and two corresponding lobe/groove pairs downstream of the blade. The criticalness of the assembly means that rinsing takes place without disassembling the juicer, which, if it may be practical in the industrial field where it is virtually in continual use, is inconceivable for a domestic use, where the juicer is sometimes left unused for long periods. Moreover, such a juicer is liable to jamming in the presence of particularly small or large fruits or where the rind is particularly thick. Moreover, since the clearance between the lobes and the grooves is fixed, if a citrus fruit has a particularly thin rind, it tends not to be completely juiced. Finally, having numerous parts which must be synchronously rotated, such a juicer requires quite a complex gearbox.

The technical problem at the basis of the present invention is that of providing a whole fruit electric juicer which is small in size and is easy to manufacture and assemble. The invention regards a whole fruit electric juicer comprising a first juicing roller and a second juicing roller rotated by an electric motor, the first juicing roller and the second juicing roller having an area of smallest mutual distance acting as a maximum juicing zone, characterized in that the first juicing roller is hollow and- the second juicing roller is arranged eccentrically inside the first juicing roller.

Unlike the known juicer described above, the fruit is juiced between the outer surface of the second juicing roller and the inner surface of the first juicing roller. The volume of the juicer is therefore dictated by the diameter of the first juicing roller. Moreover, since the surfaces of the juicing rollers do not have preferential juicing zones, rather act continually, the assembly of the juicing rollers does not exhibit the critical factors outlined above and the juicing is actually continuous.

In some embodiments, the second juicing roller is capable of being fitted on a drive shaft of said electric motor, means for transmitting the rotational motion from the second juicing roller to the first juicing roller being provided.

In an embodiment the transmission means comprises a sprocket integral with the second juicing roller and means for engagement with said sprocket integral with the first juicing roller.

In particular, the engagement means can comprise a toothing at a lower portion of the circumferential inner surface of the first juicing roller.

In such a case the first juicing roller preferably comprises a flange transversal to its axis extending internally at a lower portion of the circumferential surface and provided with said inner toothing.

Alternatively, the engagement means can comprise a plurality of holes at a lower portion of the circumferential surface of the first juicing roller.

In a different embodiment, first means for transmitting the rotational motion from a drive shaft of said electric motor to the first juicing roller and second means for transmitting the rotational motion from the first juicing roller to the second juicing roller are provided.

In such a case the first transmission means can comprise a first sprocket fitted onto a drive shaft of said electric motor and an outer toothing of the first juicing roller in engagement with the first sprocket and the second transmission means can comprise an inner toothing of the first juicing roller and an outer toothing of the second juicing roller.

Preferably, the first juicing roller and the second juicing roller rotate at the same surface speed.

Alternatively, the first juicing roller can rotate at a greater surface speed than the second juicing roller or vice-versa.

Preferably, moreover, the inner surface of the first juicing roller and/or the outer surface of the second juicing roller are rough.

Preferably, moreover, the first juicing roller is housed in a cylindrical container, means for allowing the rotation of the first juicing roller within the container being provided between the side surface of the cylindrical container and the first juicing roller.

The means for allowing the rotation can comprise at least one annular sliding block.

Alternatively, the means for allowing the rotation can comprise a plurality of bearings, like rolling bearings, circumferentially spaced from each other. Preferably, moreover, a bottom surface of the cylindrical container has an outlet spout for the juice at the maximum juicing zone.

Even more preferably, filtering means are provided at the outlet spout .

Alternatively or in addition to the provision of the outlet spout for the juice, the bottom surface of the cylindrical container can be sloped with a minimum height at the maximum juicing zone.

In an embodiment, the rotational axes of the first juicing roller and of the second juicing roller are parallel to each other and are sloped at a predetermined angle with respect to the vertical, the second juicing roller being arranged eccentrically inside the first juicing roller in such a position that the maximum juicing zone corresponds to the minimum height zone .

In the practice of the present invention, the predetermined angle of inclination is chosen in such a way as to convey by gravity the citrus fruit into the maximum juicing zone and/or the juice towards the outlet spout for the juice.

Preferably, the juicer has cutting means acting upon the citrus fruit upstream of or at the juicing zone.

The cutting means can comprise a blade acting parallel to the direction of the rotational axes of the first and of the second juicing roller.

Alternatively or additionally, the cutting means can comprise at least one blade acting perpendicular to the direction of the rotational axes of the first and of the second juicing roller.

The second juicing roller can comprise a groove at a plane transversal to its axis, which can also consist of the space between two frustums of roller making up the second juicing roller.

In such a case, said at least one blade acting perpendicular to the direction of the rotational axes of the first and of the second juicing roller preferably extends from said groove of said second juicing roller.

Moreover, the juicer according to the invention preferably has means for detaching the rind from the second juicing roller.

The means for detaching the rind can comprise a foil perpendicular to the rotational axis of the second juicing roller.

When the second juicing roller comprises a groove at a plane transversal to its own axis, the end of the foil is preferably slidable in said groove of the second juicing roller.

Preferably, moreover, the cylindrical container has a removable cover with a loading opening for the citrus fruits, the cover being arranged on the cylindrical container in such a way that the opening is substantially in a diametrically opposed position with respect to the second juicing roller.

The cover preferably has a chute extending upwards at the loading opening for the citrus fruits.

Advantageously, means for interrupting the rotation of the first and of the second juicing roller, slaved to the positioning of the cover, is provided.

The means for interrupting the rotation can comprise a spring acting to disengage the second juicing roller from the respective rotational axis in the absence of the cover.

Alternatively, the means for interrupting the rotation can comprise an electric switch interacting with an edge of the cover . The second juicing roller advantageously has an elastic hub at its rotational axis, whereby the distance between the first and the second juicing roller at the maximum juicing zone is variable depending on the stresses originating when the citrus fruit is between the two juicing rollers.

The elastic hub preferably comprises a plurality of elastomeric radial elements.

Preferably, the first juicing roller is housed in a cylindrical container, a bottom of the cylindrical container having a rind discharge opening downstream of the maximum juicing zone.

Preferably, at least one wall for deflecting the rinds towards the rind discharge opening is provided.

Even more preferably the at least one deflecting wall comprises a wall extending vertically from the bottom of the container.

Alternatively or additionally, the at least one deflecting wall comprises a wall hanging from the cover.

Characteristics and advantages of the invention shall now be illustrated with reference to embodiments represented as a non limiting example in the drawings, wherein:

- Fig. 1 schematically shows a perspective view of a first embodiment of a whole fruit electric juicer according to the present invention; - Fig. 2 schematically shows a section view in a vertical plane accross the juicer of Fig. 1;

- Fig. 3 schematically shows a top view of the juicer of Fig. 1, with a cover thereof partially cutaway;

- Fig. 4 schematically shows a section view in the vertical plane accross a whole fruit electric juicer according to a second embodiment of the present invention; and

- Fig. 5 shows a principle diagram of a third embodiment of a whole fruit electric juicer according to the present invention. Figures 1 to 3 schematically show a first embodiment of a whole fruits electric juicer 1 according to the present invention.

A base unit 2 including a motor 3 having a drive shaft 4 is illustrated. The base unit 2 is intended to be rested upon a support plane and can be provided, for example, with suction feet. The motor 3 is typically a low power electric motor fed from the mains through an electric cable (not shown) and an on/off switch (not shown) arranged on the base unit 2.

The direction of rotation of the drive shaft 4 (counterclockwise in the illustrated embodiment) is indicated with X. Hereinafter in the present description and in the attached claims, the expressions "upstream" and "downstream" shall be used with reference to the direction of rotation X.

The base 2 is preferably substantially cylindrical, with a first recess 5 at its front part to receive a glass 6 or another container for the juice obtained and a second recess 7 at a side part thereof to receive a container 8 for the rinds and other leftovers of the juiced citrus fruits .

Above the base 2 a cylindrical container 9 is fitted.

The bottom 10 of the cylindrical container 9 is provided with an eccentric hole 11 for the passage of the drive shaft 4. A sealing gasket (not shown) is preferably provided at the hole 11, made so as to allow the rotation of the drive shaft 4 within the hole 11.

The cylindrical container 9 is preferably provided with an outlet spout 12 for the juice at the first recess 5 of the base 2. A filtering element 13, such as a perforated double bottom for holding the pips, is provided at the spout 12.

A portion of the bottom 10 of the cylindrical container 9 is moreover preferably lowered, sloped towards the spout 12.

A first juicing roller 14 is housed in the cylindrical container 9. The first juicing roller 14 is hollow and has no bottom, or in other words is essentially comprised of the side surface of a cylinder.

An annular flange 15 extends transversally inwards from the lower portion of the surface of the first juicing roller 14.

In the annular flange 15 a plurality of teeth 16 are made. In the gap between the first juicing roller 14 and the cylindrical container 9 means for allowing the rotation of the first juicing roller 14 within the cylindrical container 9, about their axis indicated with A, is provided.

Such means comprises, in the embodiment illustrated in figures 1-3, a plurality of bearings 17, in particular rolling bearings, circumferentially spaced along the inner side wall of the cylindrical container 9. Preferably the bearings 17 are not arranged at the outlet spout 12 for the juice .

The inner surface of the first juicing roller 14 is provided with a plurality of closely spaced longitudinal ribs 18, so as to be rough overall.

The second juicing roller 19 is capable of being fitted centered on the drive shaft 4. The second juicing roller 19 is therefore arranged eccentrically inside the first juicing roller 14.

The axis of the second juicing roller 19 and of the drive shaft 4 is indicated with B.

More specifically, the second juicing roller 19, for coupling with the drive shaft 4, has an elastic hub comprising a rigid bush 20 and a plurality of radial elements 21 extending in equally spaced radial planes between the bush 20 and the cylindrical surface of the second juicing roller 19. The radial elements 21 are made of an elastic material, for example an elastomeric material .

The outer surface of the second juicing roller 19 is provided with a plurality of closely spaced longitudinal ribs 22, so as to be rough overall.

A sprocket 23 is fitted onto the drive shaft 4, below the second juicing roller 19. The sprocket 23 is therefore rotationally integral with the second juicing roller 19. The sprocket 23 in such a case has a diameter which is slightly greater than the diameter of the second juicing roller 19 in order to ease the manufacture of the teeth.

The outer diameter of the sprocket 23 of the second juicing roller 19 and the inner diameter of the toothed flange 15 of the first juicing roller 14, as well as the shape and size of the respective teeth, are chosen so as to allow a mutual engagement thereof. The engagement modulus is preferably relatively low, for example 2 or 3. Such a low engagement modulus allows, on the one hand, an easy fitting of the second juicing roller 19 inside the first juicing roller 14 and, on the other hand, the passage of the citrus fruit juice which has been obtained in the manner which shall be described later on.

The first juicing roller 14 and the second juicing roller 19 therefore rotate in the same direction of rotation indicated by the arrow X.

Therefore, there is a zone of minimum distance between the first juicing roller 14 and the second juicing roller 19, or maximum juicing zone 24.

A blade 25 extends upwards from the bottom 10 of the cylindrical container 9 slightly upstream of the maximum juicing zone 24 in the direction of rotation X. The cutting edge of the blade 25 is the edge perpendicular to the bottom 10, upstream with respect to the direction of rotation X. The height of the blade 25 is preferably much less than the height of the cylindrical container 9, of the first juicing roller 14 and of the second juicing roller 19. More specifically, the height of the blade 25 is preferably such as to only partially cut a citrus fruit 100.

Downstream of the maximum juicing zone 24, in the direction of rotation X of the first and of the second juicing roller 14, 19, the bottom 10 of the cylindrical container 9 has an opening 26. Such an opening 26 is arranged at the recess 7 for the container 8 for the rinds .

A first wall 27 extends perpendicularly upwards from the bottom 10 of the cylindrical container 9. The first wall 27 has a curvilinear, substantially radial progression.

A first portion 28 of the first wall 27 is essentially arc- shaped. Such a first portion 28 of the first wall 27 defines an entry zone 29 of the citrus fruit in the first juicing roller 14. The entry zone 29 of the citrus fruit, in the illustrated embodiment, is substantially diametrically opposed to the second juicing roller 19.

The first portion 28 of the first wall 27 extends, moreover, from its side upstream with respect to the direction of rotation X, until it is tangent to the second juicing roller 19.

A second portion 30 of the first wall 27 extends along a portion of the perimeter of the opening 26 for the rinds on the bottom 10 of the cylindrical container 9. The portion of perimeter of the opening 26 along which the second portion 30 of the first wall 27 extends is in particular the end portion of the opening 26 in the direction of rotation X. A second wall or foil 31 extends transversally from the first wall 27.

The second wall or foil 31 is substantially shaped as a curvilinear triangle. A first floating side 32 of the second wall 31 extends up to the outer surface of the second juicing roller 19 and has a shape which is complementary to it.

The second juicing roller 19 preferably has a circumferential groove 33 extending in a median plane thereof.

Preferably, the first floating side 32 of the second wall or foil 31 partially extends in the circumferential groove 33 without impairing the rotation of the second juicing roller 19.

A cover 34 is provided to be inserted above the assembly formed of the cylindrical container 9, of the first juicing roller 14 and of the second juicing roller 19. The cover 34 has an entry opening 35 for the citrus fruits and preferably an outer chute 36 at the entry opening 35 for the citrus fruits .

The cover 34 and the cylindrical container 9 can have conjugated stop means suitable for allowing the correct insertion of the cover 34 in the angular position in which the entry opening 34 for the citrus fruits is at the entry zone 29 for the citrus fruits. As stated above, the entry zone 29 for the citrus fruits of the first juicing roller 14 preferably extends diametrically opposite to the second juicing roller 19.

Such conjugated stop means are not highlighted in the figures of the drawings, but can be for example made through tabs and tab-seats, in a way which will be obvious to those skilled in the art.

A wall 37 preferably extends from the cover 34. The wall 37 is arranged at the opening 26 for the rinds and hangs from the cover 34 with such a slope as to be substantially flush with the bottom 10 of the cylindrical container 9 at the end downstream of the opening 26 for the rinds, so as to guide the rinds towards the opening 26.

Moreover, the juicer according to the invention preferably has a safety device which allows, with the power supply connected, the rotation of the two juicing rollers 14, 19 only when the cover 34 is correctly positioned.

Such means are comprised, in a first embodiment, of an electric switch (not shown) actuated to be closed by an edge of the cover 34.

In an alternative embodiment, such means are comprised of a spring (not shown) at the hub of the second juicing roller 19. The spring is compressed by the pressure of the second juicing roller 19 towards the bottom of the cylindrical container 9 caused by the closing of the cover 34. In the absence of the cover 34, the spring tends to return into its rest state, forcing the second juicing roller 19 upwards, out of engagement with the drive shaft 4.

Since the motion is transmitted to the first juicing roller 14 by means of the sprocket 23 integral with the second juicing roller 19, when the second juicing roller 19 comes out of its seat there is no longer transmission of the motion even to the first juicing roller 14.

In the embodiment of figs. 1-3, the axis A of the first juicing roller 14 and of the cylindrical container 9 and the axis B of the drive shaft 4 and of the second juicing roller 19 are sloped at an angle of inclination α with respect to the vertical V. The angle of inclination α is chosen so as to convey by gravity the citrus fruit 100 to the maximum juicing zone 24 and/or to convey the juice of the juiced fruit 100 towards the outlet spout 12 for the juice . The axis B is arranged in such a way that the second juicing roller 19 is in the minimum height position.

In the illustrated preferred embodiment, the entry zone 29 for the citrus fruit is, accordingly, inside the first juicing roller 19 at its highest zone.

This arrangement promotes the juicing action of the citrus fruits since the displacement of the citrus fruit 100 towards the maximum juicing zone 24 is promoted by the force of gravity.

The size of the juicer 1 is related to that of the citrus fruits to be juiced. Indicating the maximum diameter of the citrus fruits to be juiced as D, preferably the height of the first juicing roller 14, of the second juicing roller 19 and of the cylindrical container 9 are substantially equal to D; the diameter of the first juicing roller 14 is substantially equal to 2D; the diameter of the second juicing roller 19 is substantially equal to D and the height of the blade 25 is less than D/2.

The operation of the juicer 1 is the following. A whole citrus fruit 100 is inserted into the chute 36 of the cover 34 and falls by gravity through its opening 35 into the cylindrical container 9, inside the first juicing roller 14, at the entry zone 29. The rotation of the first juicing roller 14 in the direction of rotation X and the presence of the first portion 28 of the first wall 27 convey the citrus fruit 100 in the direction of rotation X. The citrus fruit 100 is then pushed into contact with the inner wall of the first juicing roller 14 and with the outer wall of the second juicing roller 19. The citrus fruit 100, dragged in rotation in the direction of rotation X, is increasingly compressed between the juicing rollers 14, 19. When it passes by the blade 25, the citrus fruit 100 is partially cut at its lower portion. The cut citrus fruit 100 is then juiced at the maximum juicing zone 24. Thanks to the elasticity of the hub of the second juicing roller 19 achieved by the elastomeric radial elements 21, the size of the maximum juicing zone 24 is automatically variable depending on the pressures originating when the citrus fruit 100 is arranged in it, in particular depending on the thickness of the rind of the citrus fruit 100.

The juice filters between the teeth of the sprocket 23 integral with the second juicing roller 19 and the teeth 16 of the flange 15 of the first juicing roller 14, collects at the bottom 10 of the cylindrical container 9 and pours from the spout 12 directly into the glass 6 arranged in the recess 5 of the base unit 2 of the juicer 1. The pips, small pieces of rind and other possible leftovers are held by the filter 13. The rind of the juiced citrus fruit 100 is dragged by the juicing rollers 14, 19 downstream in the direction of rotation X, beyond the maximum juicing zone 24, and falls through the appropriate opening 26 in the bottom 10 of the cylindrical container 9, into the container 8 for the rinds arranged in the recess 7 of the base unit 2 of the juicer 1.

The second portion 30 of the first wall 27 and/or the second wall or foil 31 function as scrapers of the second juicing roller 19 to promote the detachment of the rind. The second portion 30 of the first wall 27, moreover, prevents the rind and other leftovers from being dragged in rotation beyond the opening 26 for the rind and promotes their disposal into the container 8 for the rind. An analogous function is carried out by the wall 37 hanging rom the cover 34.

As soon as a citrus fruit 100 has begun rotating in the direction of rotation X and has freed the entry zone 29, a second citrus fruit inserted into the chute 36 can enter into the entry zone 29. The operation of the juicer 1 according to the present invention is therefore totally continuous and automatic.

The cover 34 has the function of avoiding spattering of juice around the juicer 1. Moreover, it has a safety function since, in the case of removal of the cover 34, as described above the rotation of the two juicing rollers 14, 19 is automatically interrupted.

At the end of use of the juicer 1, the cover 34, the second juicing roller 19, the first juicing roller 14 and possibly the cylindrical container 9 can be removed from the base unit 2 to be washed.

All of such elements are preferably made of a plastic material suitable for use with food, which can be washed in a dishwasher.

Fig. 4 schematically shows a section view in the vertical plane accross a whole fruits electric juicer 1 according to a second embodiment of the present invention.

Such an embodiment differs from the embodiment shown in figures 1-3 in that the axes A and B are vertical, namely that the angle of inclination with respect to the vertical V is zero. To ease the outflow of the juice from the spout 12 in such an embodiment, all of the bottom 10 of the cylindrical container 9 is preferably slaped towards the spout 12.

Fig. 5 shows a principle diagram of a third embodiment of a whole fruit electric juicer 1 according to the present invention, in a top view.

Such an embodiment differs from the embodiments shown in figures 1-4 in that the transmission of the rotational motion takes place from the drive shaft 4 to the first juicing roller 14 and from the first juicing roller 14 to the second juicing roller 19.

More specifically, in the embodiment of figure 5, a sprocket 38 is integral with the drive shaft 4. Such a sprocket 38 is arranged outside of the first juicing roller 14 and engages with an outer toothing 39 made on the first juicing roller 14 or at least integral with it. To allow the engagement, an aperture (not shown) shall be suitably provided in the wall of the cylindrical container 9. The coupling between the two juicing rollers 14, 19 can be, for example, as described with reference to figures 1-4.

Moreover, in figure 5 cutting means different from the blade 25 described with reference to the embodiment of figures 1-3 are shown. In particular, in figure 5 a horizontal blade 40 is illustrated housed between two frustums of a roller making up the second juicing roller 19. Such a blade 40 slightly protrudes beyond the side surface of the second juicing roller 19 and rotates with the second juicing roller 19.

Moreover, variants, modifications, additions, replacements and omissions of details can be applied to the various embodiments, for example as described hereinafter.

The different configuration of the cutting means and the configuration of the second juicing roller 19 as being composed of two coaxial frustums of roller can be applied to all of the embodiments of the juicer 1 according to the invention.

The direct coupling between the first juicing roller 14 and the second juicing roller 19 implies an equal tangential speed of the respective internal and external surfaces, and therefore an equal dragging speed of the citrus fruit 100 by the two juicing rollers 14, 19. Alternatively it is however possible to use different means for transmitting the motion, in other words to provide a surface speed of the second juicing roller 19 which is greater than the surface speed of the first juicing roller 14 or vice-versa.

Independently of the respective speeds, the coupling between the first juicing roller 14 and the second juicing roller 19 and the drive shaft 4 can be made in many different ways from those illustrated with reference to the figures, as it shall be manifest to a man skilled in the art .

The sprocket 23 can be made as a single piece with the second juicing roller 19.

The manufacture of the inner toothing 16 at the annular flange 15 extending from the first juicing roller 14 is advantageous since it promotes the manufacture of the toothing itself providing the material discharge outlet for the tool or at least for the removal from the mould.

However, as an alternative to this, a toothing made by removing material at the lower portion of the side surface of the first juicing roller 14 may be provided.

Alternatively, the first juicing roller 14 can have, at the lower portion of its side surface, a series of holes for engagement with the teeth of the sprocket 23 integral with the second juicing roller 19.

As still another alternative, the second juicing roller 19 can have a series of holes for engagement with a sprocket integral with the first juicing roller 14.

The toothings 16 and 23 for the transmission of motion between the first juicing roller 14 and the second juicing roller 19 can be arranged other than as shown in the figures. For example, they could be arranged at the upper end of the juicing rollers 14, 19. Alternatively, they could be made below the bottom of the cylindrical container 9.

Moreover, it is possible to provide for distinct electric motors, still fed in parallel, for the rotation of the first juicing roller 14 and of the second juicing roller 19. The first juicing roller 14 can in such a case have a central shaft and radial elements arranged at its upper periphery. The ribs 18, 22 of the first juicing roller 14 and of the second juicing roller 19 can be missing or can be replaced by annular ribs or by differently shaped raised elements.

Although in the embodiments of figures 1-3 three rolling bearings 17 are illustrated, it will be understood that the actual number of rolling bearings 17 can vary according to the size of the juicer 1, the speed of rotation of the motor 3, the materials used, etceteras.

Alternatively, the means for allowing the rolling of the first juicing roller 14 within the cylindrical container 9 can be of the sliding-block- or of the ball-bearing-type.

The first wall 27 and the second wall or foil 31 can be missing, just one can be present or they can be modified. For example, the second wall or foil 31 can be missing when the second portion 30 of the first wall 27 or another wall perpendicular to the bottom 10 of the cylindrical container 9 extends along the entire portion of the perimeter of the opening 26 for the rind, for example if the first wall 27 is forked upstream or if the opening 26 for the rind extends up to very close to the second juicing roller 19 and to the second portion 30 of the first wall 27.

The first portion 28 of the vertical wall 27, defining the entry zone 29 of the citrus fruit, can be missing and/or replaced with a wall hanging from the cover 34 or with pins extending from the bottom 10 of the cylindrical container 9.

The second portion 30 of the first wall 27 or the second wall or foil 31 can, moreover, be missing when the outer surface of the second juicing roller 19 is smooth, that is when the ribs 22 are missing, or else when the speed of rotation of the second juicing roller 19 creates a sufficient centrifugal force to determine the detachment of the rind from its outer surface.

The entry zone 29 for the citrus fruit does not necessarily have to be diametrically opposite the maximum juicing zone 24, although such a configuration allows the diameter of the first juicing roller 14 and therefore the overall size of the juicer 1 to be reduced as much as possible.

The stop means for the angular position of the cover 34 can also be missing. This can be preferable in order to allow the entry zone 29 of the citrus fruits to be displaced in the direction of rotation X to allow that the citrus fruit is inserted in an area between the two juicing rollers 14, 19 having always a suitable size. In other words, the smaller the diameter of the citrus fruit, the further downstream it can be inserted in the first juicing roller 14, to promote it being dragged between the juicing rollers 14, 19 also in the absence of the portion 28 of the vertical wall 27.

The blade 25 and the rotating blade 40 can be used alternatively or simultaneously, in each of the described embodiments .

Instead of the single rotating blade 40 illustrated in figure 5 different rotating blades can be present distributed around the circumference of the second juicing roller 19.

The juicer 1 of the embodiments described above, and in particular of the one in figure 4, could also be marketed as a self-contained accessory, without the base unit 2, for use with the base of a kitchen appliance provided with a rotating motor, such as a food processor, a blender or the like.

Claims

1. Whole fruit electric juicer (1) comprising a first juicing roller (14) and a second juicing roller (19) rotated by an electric motor (3) , the first juicing roller (14) and the second juicing roller (19) having a zone of minimum mutual distance acting as a maximum juicing zone (24) , characterized in that the first juicing roller (14) is hollow and the second juicing roller (19) is arranged eccentrically inside the first juicing roller (14) .

2. Juicer (1) according to claim 1, characterized in that the second juicing roller (19) is capable of being fitted on a drive shaft (4) of said electric motor (3) , means (15, 16, 23) for transmitting the rotational motion from the second juicing roller (19) to the first juicing roller (14) being provided.

3. Juicer (1) according to claim 2, characterized in that the transmission means (15, 16, 23) comprises a sprocket

(23) integral with the second juicing roller (19) and means (15, 16) for engagement with said sprocket (23) integral with the first juicing roller (14) .

4. Juicer (1) according to claim 1, characterized in that it comprises first means (38, 39) for transmitting the rotational motion from a drive shaft (4) of said electric motor (3) to the first juicing roller (14) and second means (15, 16, 23) for transmitting the rotational motion from the first juicing roller (14) to the second juicing roller (19) .

5. Juicer (1) according to claim 1, characterized in that the first juicing roller (14) and the second juicing roller (19) rotate at the same surface speed.

6. Juicer (1) according to any one of the previous claims, characterized in that the inner surface of the first juicing roller (14) and/or the outer surface of the second juicing roller (19) are rough (18, 22) .

7. Juicer (1) according to any of the previous claims, characterized in that the first juicing roller (14) is housed in a cylindrical container (9) , means (17) for allowing the rotation of the first juicing roller (14) within the cylindrical container (9) being provided between the side surface of the cylindrical container (9) and the first juicing roller (14) .

8. Juicer (1) according to claim 7, characterized in that a bottom surface (10) of the cylindrical container (9) has an outlet spout (12) for the juice at the maximum juicing zone (24) .

9. Juicer (1) according to one of claims 7 and 8, characterized in that the bottom surface (10) of the cylindrical container (9) is sloped with a minimum height at the maximum juicing zone (24) .

10. Juicer (1) according to any of the previous claims, characterized in that the axes of rotation (A, B) of the first juicing roller (14) and of the second juicing roller (19) are parallel to each other and are sloped at a predetermined angle (α) with respect to the vertical (V) , the second juicing roller (19) being arranged eccentrically inside the first juicing roller (14) in such a position that the maximum juicing zone (24) corresponds to the minimum height zone .

11. Juicer (1) according to any one of the previous claims, characterized in that it has cutting means (25, 40) acting upon the citrus fruit (100) upstream of or at the maximum juicing zone (24) .

12. Juicer (1) according to any of the previous claims, characterized in that it has means (28, 31) for detaching the rind from the second juicing roller (19) .

13. Juicer (1) according to any one of claims 7-9 or 10-12 when dependent upon claim 7, characterized in that said cylindrical container (9) has a cover (34) with a loading opening (35) for the citrus fruits, the cover (34) being arranged on the cylindrical container (9) in such a way that the opening (35) is substantially in a diametrically opposite position with respect to the second juicing roller (19) .

14. Juicer (1) according to claim 13, characterized in that it has means for interrupting the rotation of the first and of the second juicing roller (14, 19), slaved to the positioning of the cover (34) .

15. Juicer (1) according to any of the previous claims, characterized in that the second juicing roller (19) has an elastic hub (20, 21) at its rotational axis (B) .

16. Juicer (1) according to claim 15, characterized in that the elastic hub (20, 21) comprises a plurality of elastomeric radial elements (21) .

17. Juicer (1) according to any of the previous claims, characterized in that the first juicing roller (14) is housed in a cylindrical container (9) , a bottom(lθ) of the cylindrical container having a rind discharge opening (26) downstream of the maximum juicing zone (24) .

18. Juicer (1) according to claim 17, characterized in that it comprises at least one wall (30, 37) for deflecting the rind towards the rind discharge opening (26) .