RU2588450C2 - Device for producing soya bean milk - Google Patents

Abstract

FIELD: food industry.

SUBSTANCE: invention relates to device for production of soya bean milk, and production method applying device for production of soya bean milk. Device comprises: a reservoir to accommodate beans or soya milk; working head, located on upper part of reservoir, whereas working head accommodates motor; rotary cutting device, driven by motor; collection unit, located inside reservoir, for collecting peel and residues; adjustment mechanism, located on working head and controlled to allow displacement of collecting unit inside reservoir between first position whereat beans are processed, and second position whereat peel or residues are collected into collection unit.

EFFECT: such design allows collecting peel and residues into collection unit without furnishing this assembly with separate filter and separate bowl.

15 cl, 19 dwg

Description

Technical field

The present invention relates to the field of devices for the production of soy milk and, more specifically, to a domestic device for the production of soy milk.

State of the art

Currently, devices for the production of soy milk, in particular household devices for the production of soy milk, are becoming increasingly popular. Most commercially available soya milk production devices cannot dispense soya milk without residues.

Chinese Patent CN 101632430A discloses a device for the production of soy milk, which comprises: a working head; engine located in the working head; control device; soy milk tank; a chopping device located on the output shaft of the engine; heating device and base. The known process for the production of soy milk in domestic conditions mainly includes the following stages: manually soaking the beans by the consumer, for example, by placing dry beans in water and soaking them at room temperature until morning; mixing / boiling beans when controlling this process in an automatic mode by means of a device for the production of soy milk; filtering the residues manually by the consumer to obtain soy milk.

Therefore, this type of device for the production of soy milk should be equipped with a separate filter and a separate bowl for filtering soy milk, since residues remaining in soy milk will affect the taste and aroma of soy milk. One problem is that residues must be manually filtered by consumers. Another problem is that the additional filter and bowl will occupy a larger space, which will bring inconvenience to the user.

SUMMARY OF THE INVENTION

It will be preferable to obtain a device for the production of soy milk, in which there is a unit for collecting peel and residue. It will also be desirable to provide the device for the production of soy milk with the possibility of collecting peels after the process of peeling and collecting residues after the production process of soy milk using the same collection unit.

In this regard, in a first aspect of the invention, there is provided an apparatus for producing soy milk, comprising: a reservoir; a working head located in the upper part of the tank, inside which the engine is located; rotary cutting device driven by the specified engine; peel and residue collection unit located inside the tank; an adjustment mechanism located on the working head and adjustable so as to allow the collection unit to move inside the tank between the first position in which the beans are processed and the second position in which the peel and residues are collected in the collection unit.

In this aspect, the peel and residues can be collected in a collection unit and stored temporarily there, and then soy milk is obtained and stored in a tank, ready for human consumption.

In one preferred embodiment, the collection unit of the device for the production of soy milk contains a collecting basket and a guide bowl concentrically located at the bottom of the collecting basket.

In this preferred embodiment, the guide bowl may agitate a mixture of water and beans in the tank to form a stream passing through the collecting basket above the guide bowl, as a result of which the peel and residues are trapped in the collecting basket.

In another preferred embodiment, the device for the production of soy milk contains a connector passing through the working head and connecting the collecting basket with an adjustment mechanism for hanging the collecting basket inside the tank.

In this preferred embodiment, the collecting unit of the collection unit of the soy milk production device is suspended inside the tank and connected to the adjusting mechanism by means of a connector so that the collection unit can easily move inside the tank between the first position and the second position by operating the adjustment mechanism.

In another preferred embodiment, the adjusting mechanism comprises a threaded rod attached to the working head and extending upward, a nut screwed onto the threaded rod, and a hand lever detachably mounted on the nut and connected to the connector.

In this preferred embodiment, the device for the production of soybean milk contains an adjustment mechanism that provides the collection unit with the ability to move between the first position and the second position in case the manual lever of the adjustment mechanism is moved up and down as the nut is raised up and down. This type of adjustment mechanism has a simple structure and can be easily operated.

In yet another preferred embodiment, the guide bowl of the collection unit of the soy milk production apparatus extends a first distance above the lower surface of the collection basket of the collection unit so that a chamber is formed between the guide bowl and the collection basket.

In this preferred embodiment, a chamber is formed between the guide bowl and the collecting basket of the collection unit so that peel and debris accumulate therein.

In yet another preferred embodiment, the upper end of the guide bowl is adjacent to the lower end of the working head when the collection unit is in the first position.

In this preferred embodiment, the chamber is arranged in such a way as to prevent the skin and residues retained therein from coming into contact with the mixture of water and beans in the tank through the guide bowl.

In yet a further preferred embodiment, the upper end of the collecting basket is fixedly mounted on the working head in such a way as to prevent spilling of the peel or residues in the chamber, and also to prevent the contents of the tank from entering the collection unit through the upper end of the collecting basket.

In a second aspect of the invention, there is provided a method for producing soy milk using a device for producing soy milk, comprising the steps of: grinding at a first speed, wherein the peel is separated from the beans when the collection unit is held in the first position; grinding at a second speed to collect the peel when the collection unit is installed and held in a second position; grinding at a third speed when the collection unit is installed and held in a first position; and grinding at a fourth speed to collect residues when the collection unit is installed and held in a second position.

In this aspect, the peel is collected after grinding at a first speed, that is, before the peeling process and before grinding at a third speed, that is, before complete grinding, to produce soy milk. Residues are collected after grinding at the third speed, that is, after the soy milk production process. The addition of a bean peeling and peeling step will improve the parameters for reducing residues during the soy milk production process and will squeeze more nutrients into soy milk. Both at the stage of collecting the peel and at the stage of collecting residues, the collection unit is installed and held in the second position.

In one preferred embodiment, the second speed is lower than the first speed, the first speed is lower than the third speed, and the fourth speed is equal to the second speed, the first speed being an average speed in the range of 1000-4000 rpm, the second speed is a low speed in the range of 300-800 rpm / min, and the third speed is a high speed that exceeds 10,000 rpm.

In this preferred embodiment, the beans can be satisfactorily peeled at medium speed, the peel and residues can be efficiently collected at low speed, and soy milk can be produced at high speed.

In another preferred embodiment, for separating the peel from the beans before the grinding step at a first speed, the method further includes the steps of regulating the adjusting mechanism, ensuring that the collection unit of the soy milk production unit is held in the first position.

In yet another preferred embodiment, the method further comprises the step of adjusting the adjusting mechanism, ensuring that the collection unit is held in the first position so that the milk is ready for consumption.

In yet another preferred embodiment, prior to the grinding step at a first speed to separate the peel from the beans, when the collection unit is held in the first position, the method further includes the step of soaking the beans in water having a temperature of about 90 ° for about 4 minutes.

These and other aspects of the present invention are explained below with reference to the following embodiments.

Brief Description of the Drawings

The details and operation of the mechanism of the device according to the invention, as well as additional technical results and advantages will be clearer from the following description with reference to the accompanying drawings, in which the same positions denote the same elements, in which:

Figa is a top and perspective view of a device for the production of soy milk in accordance with an embodiment of the invention, wherein the collection unit of this device is in a first position;

Fig.1b is a side view of the device of Fig.1a;

Fig. 1c is a sectional view of the device of Fig. 1a;

Fig. 2a is another top and perspective view of a device for producing soy milk in accordance with an embodiment in which a collection unit of a device for producing soy milk is in a second position;

Fig.2b is a side view of the device of Fig.2a;

Fig. 2c is a sectional view of the device of Fig. 2a;

Fig. 3a is a top and perspective view of a part of the device for producing soy milk in Fig. 1a, which shows the adjusting mechanism and the collection unit of the device for producing soy milk, moreover, at least the reservoir of the device for soy milk production;

Fig. 3b is an exploded perspective view of a part of the soy milk production apparatus of Fig. 3a;

Fig. 4a is a perspective view of a part of the device for the production of soy milk in Fig. 3a, which shows the adjusting mechanism mounted on it in its first position, and for clarity, the collection unit is not shown;

Fig. 4b is a side view of a portion of the soy milk production apparatus of Fig. 4a, which shows the adjustment mechanism in its first position;

Fig. 4c is a plan view of Fig. 4b;

Fig. 4d is an enlarged perspective view of the nut of the adjusting mechanism of Fig. 4a;

Fig. 5a is a perspective view of a collection unit of a device for producing soy milk in Fig. 3a;

Fig. 5b is a side view of the collection unit of Fig. 5a;

Fig. 5c is a plan view of the collection unit of Fig. 5a;

Fig. 6a is a cross-sectional view similar to Fig. 1c, showing parts inside the device for producing soy milk, in which the collection unit is in the first position;

Fig. 6b is a cross-sectional view similar to Fig. 2c, showing parts inside the soy milk production apparatus, in which the collection unit is in the second position;

Fig.6c is a partial view of Fig.6b on an enlarged scale.

7 is a block diagram of a device.

Detailed Description of Embodiments

Although various forms of the invention may be allowed, the drawings show and will describe in detail specific embodiments with the understanding that the present disclosure is to be considered an illustrative example of the principles of the invention and is not intended to limit the invention to the examples shown and described.

Used here are the terms that specify the direction, such as upper, lower, vertical, horizontal, etc., do not indicate the specific desired orientation, but are used to simplify the description of the invention.

The term "beans" as used here is a generic term and can refer to soybeans, golden bean beans, Chinese wigne, etc., and the term "cotyledon" (cotyledon) means non-husked beans, which may also be called the "inside of the bean" "Or" peeled beans. "

The device will now be described with reference to FIGS. 1a-3b, which show a device for the production of soy milk in accordance with a preferred embodiment of the invention. The device 100 for the production of soy milk contains a tank 1 for placing beans or soy milk, a working head 2 located on the upper part of the tank 1 and containing the engine (not shown), a rotary cutting device 3, driven by the engine; a peel and residue collection unit 4 located inside the tank 1, and an adjustment mechanism 5 located on the working head, said adjustment mechanism being configured to allow the collection unit 4 to be moved inside the tank 1 between the first position (see Fig. 1c) and the second position ( see Fig. 2c).

As shown in FIG. 1a or FIG. 2a, the tank 1 has a housing 11 and a base 12 on which the housing 11 is mounted. At the base 12, a heating device (not shown) is provided, such as a heating tube, which is used to heat beans or soy milk in the housing 11 of the tank 1. Alternatively, the heating tube may be connected to the rotary cutting device 3 (see Fig.3b). For ease of use, a handle 13 is additionally provided in the tank 1.

As shown in FIGS. 3a and 3b, the working head 2 comprises a head cover 21 for closing the reservoir 1 and the head housing 22 containing the engine. On the head cover 21, the adjusting mechanism 5 is located along the longitudinal axis A. The rotary cutting device 3 is connected to the output shaft of the engine and extends vertically downward so that it can be rotated by the engine.

Now with reference to FIG. 3a-3b in connection with FIG. 5a-5c, in these figures, the collecting unit 4 comprises a collecting basket 41 for collecting peel and residues and a guide bowl 42 concentrically located at the bottom of the collecting basket 41 for mixing water or mixture in the tank body 11. As can be seen in FIG. 6c, the guide bowl 42 extends a first distance above the bottom surface of the collecting basket 41 so that a chamber 44 is formed between the guide bowl 42 and the collecting basket 41. The guide bowl 42 extends a second distance B below the lower surface of the collecting basket 41 and is located at a third distance from the bottom of the tank 1.

As shown in FIG. 5a, the collecting basket 41 has a cylindrical shape, a filter 411 is provided in its lower part for filtering the liquid from the peel and residues. In some cases, the filter 411 may also be provided from the side of the collecting basket 41. Note that the filter 411 may be a separate element mounted on the collecting basket 41, or a mesh screen formed integrally with the collecting basket 41, subject to the filtering function. As shown in FIG. 5b, the guide bowl 42 has a cylindrical body with guide holes 421 located therein, which allow an unlimited flow of water or mixture to flow in and out of the guide bowl. Guide holes 421 may be sized in accordance with normal practice.

3b, the adjusting mechanism 5 comprises: a threaded rod 51 mounted on the cover 21 of the working head 2 and continuing upward; a nut 52 screwed onto a threaded rod 51; and a hand lever 53 detachably mounted on the nut 52. As shown in Fig. 4d, a lower part 521 is provided at the bottom of the nut 52 so that the hand lever 53 can be fitted on it. In addition, an annular groove 522 is formed in the central part of the nut 52 .When the hand lever 53 is mounted on the nut 52 between the base 521 and the annular groove 522, the fixing spring 54 is attached to the nut 52 and received in the annular recess 522. As a result, the hand lever 53 is held in place and can be displaced together with the nut 52 between the first position andsecond position.

In this embodiment, a control unit (not shown), such as an MCU (microprocessor), is provided in the working head for controlling the engine and, accordingly, the rotary cutting device 3 driven by the engine. Therefore, the grinding speed and grinding time of the rotary cutting apparatus 3 can be controlled by the engine control unit.

This control unit may further control a heater (not shown) so as to control the heating process during the production of soy milk. It can also control the soaking time of beans, etc. If required, the control unit can also provide information to the user, such as giving a signal to remind the user of the end of the process (such as peeling), and the adjusting mechanism 5 must function to move the collection unit from one position (first position or second position) to another position (second position or first position).

As shown in FIGS. 3a and 3b, a connector 43 is provided for holding the collection unit 4 in place (see FIG. 3b) for connecting the collecting basket 41 to the hand lever 53 of the adjusting mechanism 5. In this embodiment, the connector 43 comprises three suspensions 431, which are attached to three eyes 412, evenly distributed on the basket 41 along the periphery of its upper end. In this case, the pendants 431 extend upward from the collecting basket 41 and pass through the corresponding holes 211 (see Fig. 3b), which are formed in the cover 21 of the head of the working head 2 for connection with the adjusting mechanism 5. As a result, the collection unit 4 is suspended inside the tank so that it can move between the first position in which the beans are processed to separate the peel or residues, and the second position in which the peel or residues are collected in the collection unit 4. Note that for the suspension to pass through the head cover 21 The appropriate through holes 211 (see. Fig 3b) formed in the lid 21 of the working head 2, through which the suspension 431 so as to be connected with a hand lever 53.

3b, the hand lever 53, respectively, has three horizontal elongated lever parts 531 for attaching the top of each of the suspensions 431 to the corresponding elongated part 531 of the lever 53 through a through hole 532 formed in each of the elongated lever parts 531 . Preferably, screws from the upper side of the hand lever 53 are used to secure the suspensions 431 in the through hole 532. Alternatively, the through holes 532 may be threaded holes and the upper ends of the suspensions 431 may be threaded (see FIG. 3b), so that the upper end of the suspension 431 is screwed into the corresponding threaded through hole 532. In addition, it should be noted that although three suspensions are disclosed in this embodiment, the number of suspensions 431 can be changed, and the number of elongated lever parts 531 can be changed accordingly. In addition, even though the connector 43 in this embodiment takes the form of pendants, it can also take other forms, such as carrier rings, and pendants or carrier rings can be formed, for example, as a unit with the collecting basket 41.

Now, with reference to Fig. 6a, the collection unit 4 is in the first position, namely in the upper position. Accordingly, the adjusting mechanism 5 is also in its first or upper position. It should be understood that the upper position is the so-called initial position of the device for the production of soy milk, and in this position the beans can be processed in any way, but the collection of the peel or residues is not possible. Thus, only if the peel or residues are collected, the collection unit 4 is in the second position, which is the lower position (see Fig.6b). In this case, the adjusting mechanism 5 is in its second or lower position.

As indicated by FIG. 6a, the upper end of the guide bowl 42 is adjacent to the lower end of the housing 22 of the head of the working head 2, if the collection unit 4 is in the upper position so that fluid communication between the chamber 44 and the tank 1 through the guide bowl can be prevented 42. A rubber pad 423, which is impervious to both water and soy milk, is located on the upper end of the guide bowl 42 between the guide bowl 42 and the housing 22 of the head of the working head 2. As a result, in this case, water or soy milk will never enter the chamber 44 through the guide bowl 42.

Further, as shown in FIGS. 6a-6c, and especially in FIG. 6c, we can see that the upper end of the collecting basket 41 fits snugly on the housing 22 of the head of the working head 2, regardless of the position in which it is located (upper position, as shown in Fig. 6a, or lower position, as shown in Fig. 6b or 6c), in order to prevent spilling of the peel or residues (if any) present in the chamber 44, and also to prevent the ingress of water or soy milk, located in the tank 1, in the collection node 4 from the upper end of the collecting basket 41 Note that the rubber gasket 413 is also located on the upper end of the collecting basket 41 to ensure waterproof sealing between the collecting basket 41 and the side wall of the housing 22 of the head of the working head 2.

When picking peel or residue separated from the beans is required, the picking unit 4 will be moved from the upper position to the lower position by turning the nut 52 in the downward direction of the threaded rod 51. When the nut 52 is moved by the user with one hand, the hand lever 53 moves down along with the nut 52 so that the pendants 431 cause the collecting basket 41 to move down. When the bottom 52 of the nut is adjacent to the upper surface of the smooth part 511 of the threaded rod 51 (see FIG. 6b), the collecting basket 41 will reach the lower position. In this lower position, the upper end of the collecting basket 41 is in contact with the side wall of the housing 22 of the head of the working head 2, while the upper end of the guide bowl 42 is disconnected from the lower end of the housing 22 of the head of the working head 2 (see Fig. 6c). Therefore, the peel or residues can be transferred from the reservoir 1 in the chamber 44 of the collection unit 4 through the guide bowl 42, as shown in FIG. 6b.

When soy milk is ready, the collection unit 4 is set back to its initial position, which is the upper position, by turning the nut 52 up. Before cleaning the collection unit 4, the upper end of the suspensions 431 is disconnected from the through holes 532 of the manual lever 5 so that the suspensions 431 can be removed from the through holes 532 (see Fig. 3b) of the manual lever 53 and from the through holes 211 of the cover 21 of the working head 2. As a result, the collection unit 4 can be removed so that it is possible to clean and rinse the peel and residues.

Next, with reference to flowchart 7, a process for producing soy milk by a device for producing soy milk in accordance with one preferred embodiment of the second aspect of the present invention will be described, including the following steps in which:

1) hold the collection unit 4 of the device 100 for the production of soy milk in the upper position by functioning of the nut 52 of the adjusting mechanism 5 (if necessary) at step 101;

2) soak the beans in water at a temperature of 90 ° C for 4 minutes in step 102;

3) carry out the peeling of the beans by grinding at a first average speed at which the peel is separated from the cotyledons at stage 103;

4) rotate the nut 5 down and hold the collection unit 4 in the lower position, after which the peel is collected in the chamber 44 by grinding at a second low speed in step 104;

5) rotate the nut 5 up and hold the collection unit 4 in the upper position, perform grinding at a third high speed to obtain soy milk in step 105;

6) heat soy milk for one minute at step 106;

7) rotate the nut 5 down and hold the collection unit 4 in the lower position, and then collect the residues in the chamber 44 by performing grinding at the fourth low speed in step 107.

The soaking time and the soaking temperature indicated in the present embodiment are merely examples intended to achieve a good effect; and they should not be construed as limiting the invention. Those skilled in the art will appreciate that the soaking time is different for different soaking temperatures. For example, with regard to soybeans, if the beans are soaked in hot water in the range of, for example, from 45 to 90 ° C, the soaking period is from 4 to 45 minutes (from about 4 minutes in water with a temperature of 90 ° C and up to about 45 minutes in water at 45 ° C). These parameters are not limited to the specified specific range; for example, when using water at room temperature or lower, it is still possible to soak the beans at a water temperature above 90 ° C.

Experiments prove that peeling helps to reduce residues during the soy milk production process and ensures that more nutrients are squeezed into soy milk. However, in the case of peeling, the mixture of cotyledons and peel will remain mixed in water. Since it is still difficult to completely grind the peel into small pieces due to the elasticity of their fabric, it is necessary to carry out the collection of the peel before it becomes possible to carry out the collection of residues.

Note that depending on various types of beans, different absorption times or any other factors, it is possible to set different grinding speeds to achieve high productivity. The grinding speed for different conditions can be set through experiments or tests. In this embodiment, the first average grinding speed in step 103 may be 3800 rpm, the second low grinding speed in step 104 may be 600 rpm, the third high grinding speed in step 105 may be 15000 rpm, and the fourth low speed grinding at stage 107 may be 600 rpm

Specialists in the art can understand and implement modifications to the disclosed embodiments by examining the description, drawings and appended claims. All such modifications, which do not depart from the essence of the invention, are intended to be included in the scope of the attached claims.

For example, the invention can be implemented in an embodiment in which the adjusting mechanism may take a different shape, in the sense that the nut 52 from the adjusting mechanism is replaced by a sliding sleeve, and the threads of the threaded rod 51 of the adjusting mechanism are removed so that the sliding sleeve is mounted on the rod and could slide up and down along the rod. The adjusting mechanism may further comprise at least one cam, which is located under the collecting basket 41 of the collecting unit 4 inside the tank 1. The cam (s) can be driven by a stepper motor, moving the collecting unit 4 of the device 100 for the production of soy milk up and down between the two positions. Thus, in steps 101 and 105, under the control of the MCB, the stepper motor drives the cam (s), rotating them so that the protrusion or protruding parts of the cam (s) come into contact with the collecting basket 41 from the collection unit in order to to raise it to a high position and hold it there. At stages 104 and 107, the protruding parts of the cam (s) are disconnected from the lower part of the collecting basket 41, and the concave parts of the cam (s) are adjacent to it so that the collection unit 4 of the soy milk production apparatus 100 is lowered and held in a lower position .

Other changes to the disclosed embodiments may be understood and made by those skilled in the art in practicing the claimed invention, from a study of the drawings, disclosure and appended claims. The word “comprising” or “comprises” does not exclude the presence of elements or steps not listed in the claims or in the description. An attribute in the singular does not exclude the presence of a plurality of such elements. In the claims, any positions in parentheses should not be construed as limiting the scope of the invention.

Claims (15)

1. A device for the production of soy milk, containing:
reservoir (1);
a working head (2) located on the upper part of the tank, the engine being located in the working head;
rotary cutting device (3) driven by an engine;
a collection unit (4) located inside the tank (1) for collecting peel and residues;
an adjustment mechanism (5) adjustable to allow the collection unit (4) to move inside the tank (1) between the first position in which the beans are processed and the second position in which the peel and residues are collected in the collection unit. 2. The device according to claim 1, in which the collection unit (4) further comprises a collecting basket (41) and a guide bowl (42) concentrically located at the bottom of the collecting basket. 3. The device according to claim 2, in which a connector (43) is provided for connecting the collecting basket to the adjusting mechanism through the working head for hanging the collecting basket inside the tank. 4. The device according to claim 3, in which the connector (43) contains pendants (431), extending upward from the collecting basket and through the working head for connection with the adjusting mechanism. 5. The device according to claim 3, in which the adjusting mechanism (5) comprises a threaded rod (51) fixed to the working head and continuing upward; a nut (52) engaged with the threaded rod, and a hand lever (53) removably mounted on the nut and connected to the connector (43). 6. The device according to claim 5, in which the pendants (431) contain three pendants that are evenly spaced along the circumference of the collecting basket, while the manual lever (53), respectively, has three elongated parts (531) of the lever, each suspension being fixed on its upper end, corresponding to the length of the hand lever. 7. The device according to claim 6, in which the nut (52) has a base (521) on its lower part and an annular groove (522) in its middle part, and a holding spring (54) fits inside the annular recess to hold the hand lever in place when the hand lever is installed between the base and the annular groove of the nut. 8. The device according to claim 3, in which the adjusting mechanism (5) comprises a rod attached to the working head (2) and extending upward, a sliding sleeve mounted on the rod with the possibility of sliding along the rod, a manual lever (53), removably mounted on a sliding sleeve and connected to the connector (43), and at least one cam located under the base of the collecting basket inside the tank and driven by the second engine so that the collection unit can move between the first position and the second position through PTO cam rotation. 9. The device according to any one of paragraphs. 1-8, in which the guide bowl (42) extends a first distance above the lower surface of the collecting basket so that a chamber (44) is formed between the guide bowl and the collecting basket. 10. The device according to any one of paragraphs. 1-8, in which the guide bowl (42) extends a second distance B below the lower surface of the collecting basket (41) and is spaced a third distance C from the bottom of the tank (1). 11. The device according to any one of paragraphs. 1-8, in which the upper end of the guide bowl (42) is adjacent to the lower end of the working head (2) when the collection unit is in the first position so that fluid communication between the chamber (44) and the reservoir through the guide bowl is prevented. 12. The device according to claim 11, in which the rubber gasket (423) is located on the guide cup (42) to form a waterproof seal between the guide cup and the working head. 13. The device according to any one of paragraphs. 1-8, 12, in which the upper end of the collecting basket (41) is firmly seated on the working head (2) in order to prevent spilling of the peel or residues from the chamber, and to prevent the ingress of water or soy milk in the tank into the collection unit through the upper end of the collecting basket. 14. The device according to claim 13, in which the filter (411) is provided in the lower or side of the collecting basket (41). 15. The device according to any one of paragraphs. 1-8, 12, 14, in which the working head (2) contains a cover (21) for closing the reservoir and the housing (22) of the head containing the engine.

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