DE8915789U1 - Small electrical household appliance for chopping firm fruits and vegetables, especially onions, and meat products - Google Patents

Description

Small electrical household appliance for chopping firm fruits and vegetables, especially onions and meat products

The invention relates to a small electrical household appliance for chopping up solid ribs and vegetables, in particular onions, and meat products, with a fixed counter knife arranged in a cup-like working chamber and with rotating knives arranged on a working _shaft driven by an electric drive motor.

Such a device is known from DE-PS 12 19 641. It has a working container in which a knife driven by an electric motor rotates. The material to be chopped is filled into the container and chopped by the knives rotating at high speed. A counter knife is arranged on the drive shaft of the knives and is mounted laterally in a vertical groove in the container wall.

The known devices use high-speed universal motors with an idle speed of around 10,000 - 20,000 rpm and a power consumption of around 100 W. They are accordingly large and expensive. More recently, high-speed brush motors with permanent magnet excitation have also been used. The idle speed of these motors is around 10,000 rpm.

PhD 89-066

What all known devices have in common is that the blade is directly coupled to the motor shaft, so the blade has the same speed as the driving motor. This means that when, for example, onions are chopped in a small container, a mush-like pulp is produced which quickly loses its flavour and becomes unsightly. If a larger container is used, the chopping result is better. You get small pieces of onion as desired; however, these are thrown against the wall of the container by the blade and are difficult to collect in order to then be processed further.

When chopping fruit and vegetables, care must be taken to ensure that the material is not pushed in front of the blade or gets stuck between the container wall and the blade. This requires a sufficiently high blade speed. If you want the material to be cut into individual pieces and not processed into a puree, then the blade speed must not be too high.

2C should not be too high.

For practical reasons, the container should be large enough to accommodate fruits and vegetables, such as apples and onions, of normal size without being cut. This results in a container diameter of about 10 cm.

When chopping meat, the aim is to obtain a dough-like mass with as homogeneous a consistency as possible. This is only possible if the blade speed is above approx. 1,000 rpm. Together with the required cutting torque, this results in a necessary minimum power of approx. 25 to 30 W on the motor shaft for a container diameter of around 10 cm.

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PhD 89-066

It is the object of the invention to create a small, handy household appliance of the type mentioned above , with which fruits and vegetables, such as apples and onions, can be chopped into small pieces and in which the motor power can be reduced.

The stated task is solved by the invention _in that the working shaft has a rotational speed of 500 - 1,000 rpm. &ngr;&iacgr;&ogr;

By arranging a counter knife, a fruit to be chopped can no longer be pushed in front of the rotating knife; it is pressed by the rotating knives against the fixed knife. Even with meat products, the counter force of the counter knife improves the ■mincing process because the meat products cannot be skewered and taken away by the cutting knives. This allows the speed of the rotating blade. The full cutting speed of the cutting blades is thus achieved. The possibility _of using a counter blade to reduce the

The need to reduce the working speed in order to obtain well-cut pieces _J has not yet been recognized. In this way, the full cutting speed of the cutting blades is fully utilized.

According to a further embodiment of the invention, the counter knife is mounted on the working shaft so that it can rotate, and a stop for the counter knife is provided on the inner wall of the working container, which limits the free rotation of the counter knife to a maximum of 360°. The counter knife can therefore rotate a maximum of

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PhD 89-066

full rotation and then stops.

According to a further embodiment of the invention, the counter knife is arranged on the inner wall of the work container. This arrangement variant has the same

shaft and runs onto a stop on the work container wall. The rotating bearing on the work shaft can be omitted.

According to a further embodiment of the invention, it is provided that in an arrangement with longitudinally offset shaft-axis arranged, connected to the working shaft

Drive connection standing knives the counter knife

is arranged between the drive-connected knives. This results in the fruit or meat products being cut on both sides, which improves the cutting effect. The fixed counter knife holds the cutting material firmly, and the rotating Knives cut the material above and below the fixed knife.

According to a further embodiment of the invention, it is provided that the counter knife is an unground knife Such an unsharpened knife holds the material being cut better than a sharp counter knife.

According to a further embodiment of the invention, it is provided that the drive motor drives the working shaft under Intermediate gearing with a rotational speed of 500 - 1,000 rpm. If the drive motor does not drive the drive shaft directly , then

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PMD89-066

it can rotate at a higher speed and it is possible to operate with a lower power motor.

According to a further embodiment of the invention, the drive motor is a two-pole single-phase 5^&Pgr;0&igr;&igr;&Ggr;&Oacgr;&Pgr;&mgr;&idigr;&Ogr;&igr;·&Ogr;!&Ggr; inj. u uauciTuicignctxoGiiciu &igr;\&Ogr;&idiagr;.&Ogr;£" is ■ &eegr;&khgr;&idigr;&idigr; &ogr;&udigr;&igr;&udiagr;&igr;&igr;&eacgr;&Ggr; Single-phase synchronous motor with permanent magnet rotor delivers sufficient power with very small dimensions. Since this motor does not have a predetermined direction of rotation, either a symmetrical arrangement with double-sided ground blades or the use of a backstop is required.

A special design of squat and

appealing form _can be realized if, according to a further embodiment of the invention, it is provided that the drive motor when using two .with the working shaft rotating knives and a counter knife in a working container with an inner diameter of approx. 10 cm, a two-pole single-phase synchronous motor with an output of 15 to 20 W. The rotational speed of the working shaft is preferably set to approx. 750 rpm.

The invention is explained in more detail with reference to the drawing.

Fig. 1 an embodiment of a small onion and meat chopper with a non-rotating additional counter knife,

Fig. 2 shows a modification of the arrangement of the counter knife.

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PhD 89-066

In the embodiment according to Fig. 1, the drive of a small onion and meat chopper is taken over by a two-pole single-phase synchronous motor 1, which is arranged in a motor housing 3 that is fitted into a cover of the chopper. The cover of the chopper can be placed on a work container 7.

The single-phase synchronous motor with two-pole _> permanent magnet rotor drives via a transmission gear with a reduction ratio of 1:4, a working shaft 10 to which two working blades 11 are centrally attached. The working blades 11 are spaced apart along the shaft axis. Between the clamps 12 of the working blades 11 there is a counter knife 13 is rotatably mounted in the working shaft 10. For the sake of simplicity, the bearing is designed as a plain bearing 13a. On the inner wall 14 of the working container 7, a stop 15 is provided against which the counter knife can run. The stop 15 holds the counter knife after at the latest after a rotation of approx. 360°.

Between the working shaft 10 and a gear 16 of the transmission 9 driving it, a free-running clutch 17 is provided, which enables the motor 1 enables the machine to start before the drive shaft is driven. A backstop 18 acts on the gear 16, which only allows the drive motor 1 to start in one direction. If both working knives 11 are sharpened on both sides, the backstop can also be blocking can be waived.

In the embodiment according to Fig. 2, the counter knife 13 is attached directly to the container via a holder 19.

PhD 89-066

inner wall 14. The counter knife is thus arranged immovably in the working container.

The household appliance has a particularly advantageous design if it is constructed as follows: The drive motor is a single-phase synchronous motor with a two-pole, permanent magnet rotor that operates with mains voltage at 3,000 rpm. The working container has an inner diameter of approx. 10 cm. The motor power is designed for approx. 15 W. The rotational speed of the working shaft is set to approx. 750 rpm.

Such an electrical household appliance used as an onion and meat chopper is very small and handy. 15

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Claims (9)

■ · a ti &igr;&igr; it' « PHD 89-066 8 PROTECTION CLAIMS 1. Small electrical household appliance for chopping firm-fleshed fruits and vegetables, in particular onions, and meat products, with a work container (7) arranged in a single bowl-like container, fixed counter knives (13) and with rotating knives (11) which are fixedly arranged on a working shaft (10) driven by an electric drive motor (1), characterized in that the working shaft (10) has a rotational speed of 500 - 1,000 rpm. 2. Household appliance according to claim 1, characterized in that the counter knife (13) is rotatably mounted on the working shaft (10) and a stop (15) for the counter knife (13) is provided on the inner wall (14) of the working container, which stop limits the free rotation of the counter knife (13) to 360°. 3. Household appliance according to claim 1, characterized in that the counter knife (13) is arranged on the inner wall (14) of the working container. 4. Household appliance according to claim 1, characterized in that in an arrangement with knives (11) arranged offset along the working shaft axis and in drive connection with the working shaft (10), the counter knife (13) is arranged between the knives in drive connection lation standing knives (11). PhD 89-066 5. Household appliance according to claim 1, characterized in that the counter knife (13) is an unground knife. 6. Household appliance according to claim 1, characterized _in that the drive motor (1) drives the working shaft with the interposition of a gear at a rotational speed of 500 - 1,000 rpm. 7. Household appliance according to _Annex 6, characterized in that the driving motor (1) is a single-phase synchronous motor with a two-pole, permanent magnet rotor. 8. Household appliance according to claim 6, characterized in that the drive motor is designed as a single-phase synchronous motor with an output of approx. 15 W when using two knives (11) rotating with the working shaft (10) and a counter knife (13) in a working container (7) with an internal diameter of approx. 10 cm. 9. Household appliance according to claim 1, characterized in that the rotational speed of the working shaft (10) is set to approximately 750 rpm. 25