EP3049220B1 - Handheld tool for machining a process material - Google Patents

Description

The invention relates to a hand tool for processing, in particular for cutting a process material using ultrasound energy.

In many industrial applications, especially in the food industry, products of predetermined dimensions must be provided. Often foods such as bread, meat products, sausages or cheese are split and packed in tranches. For this purpose, cutting tools are used by means of which the process material is divided using ultrasound energy. A device of this kind is from [1], EP2551077A1 , known. This device comprises holding devices and guide devices by means of which the cutting tools are held and guided in order to process the process material.

In 2], EP0543628A1 , a method for cutting food using ultrasonic energy is described. In this case, ultrasonic signals are applied to a blade, which are in the frequency range between 10kHz and 60kHz and have the amplitudes in the range between 20pm and 200μm.

Often a process material is also to be processed manually. For example, to check the product quality, cuts must be made through a processed process good. In a shop, for example in a bakery or a butcher's shop, a process good, such as bread, meat or cheese, but also manually very fine and precise cut can be what often fails with conventional knives, even if the process material is clamped.

In industrial processes and hospitality, it is also often necessary to add a powder finely atomized to a process material, which usually does not succeed as desired, so the added powder must normally be distributed by stirring.

From [3], US5695510 , a surgical knife is known, which is acted upon by ultrasonic energy. Knives of this type can not be used for the purposes described above.

From [4], US6785970B1 , a knife is known which can be vibrated by means of a motor, but which requires space and energy. In addition, the desired cutting quality can not be achieved with the mechanically oscillating knife.

The present invention is therefore based on the object to provide an improved hand tool, with which a process material can advantageously be processed manually using ultrasound energy, in particular cut or atomized.

The hand tool should be compact and easy to handle. Nevertheless, relatively large process material, in particular bread, meat, cheese and vegetables can be processed precisely and with little effort with the hand tool.

The hand tool should work efficiently, so that it can work with an external or a local power supply unit and has only a relatively low weight even in autonomous operation.

The ultrasound energy should be transferable to a sonotrode with virtually no losses. Furthermore, if necessary, sufficient ultrasonic energy is available, so that even mechanically solid process material can be processed. Furthermore, the hand tool should be constructed stably, so that mechanically solid process material can be processed over a long period of time, without causing wear and tear.

This object is achieved with a hand tool having the features specified in claim 1. Advantageous embodiments of the invention are specified in further claims.

The hand tool comprises a tool part, which is held in a preferably hollow-cylindrical housing body of a housing part and which comprises an ultrasound transducer provided with at least one piezo element, which serves to deliver ultrasound energy to a blade provided on the tool part.

According to the invention, a plurality of piezoelectric elements separated by contact elements are provided, each having a transfer opening through which a transducer rod is passed, which is directly or indirectly connected to a coupling rod which is integrally connected to the blade and that provided with the transducer rod pressing member is that presses the piezoelectric elements to a stop surface of an element directly or indirectly connected to the coupling rod and mechanically coupled to the coupling rod.

1. a) ein Teil des Kopplungsstabs und dadurch einstückig mit diesem verbunden; oder
2. b) frontseitig durch eine Pressverbindung oder Schraubverbindung in einer Staböffnung im Kopplungsstab gehalten; oder
3. c) frontseitig durch eine Pressverbindung oder eine Schraubverbindung in einer ersten Zylinderöffnung eines Verbindungszylinders gehalten, der mit dem Kopplungsstab verbunden ist.

In preferred embodiments, the transducer bar

1. a) a part of the coupling rod and thereby integrally connected thereto; or
2. b) held at the front by a press connection or screw connection in a rod opening in the coupling rod; or
3. c) held at the front by a press connection or a screw connection in a first cylinder opening of a connecting cylinder, which is connected to the coupling rod.

1. a) ist ein Teil des Kopplungsstabs und dadurch einstückig mit diesem verbunden ist; oder
2. b) weist frontseitig eine zweite Zylinderöffnung auf, in der ein am Kopplungsstab vorgesehener Stabbolzen durch eine Pressverbindung oder Schraubverbindung gehalten ist; oder
3. c) weist frontseitig einen massiven oder hohlzylindrischen Zylinderbolzen auf, welcher durch eine Pressverbindung oder Schraubverbindung innerhalb der Staböffnung gehalten ist; oder
4. d) weist frontseitig eine zweite Zylinderöffnung auf, in der ein erster Bolzenteil eines Verbindungsbolzens durch eine Pressverbindung oder Schraubverbindung gehalten ist und dass in der Staböffnung ein zweiter Bolzenteil des Verbindungsbolzens durch eine Pressverbindung oder Schraubverbindung gehalten ist.

The connecting cylinder, if provided,

1. a) is a part of the coupling rod and is thereby integrally connected thereto; or
2. b) has on the front side a second cylinder opening, in which a rod provided on the coupling rod is held by a press connection or screw connection; or
3. c) has at the front a solid or hollow cylindrical cylinder pin, which is held by a press connection or screw connection within the rod opening; or
4. d) has on the front side a second cylinder opening, in which a first bolt part of a connecting bolt is held by a press connection or screw connection and that in the bar opening a second bolt part of the connecting bolt is held by a press connection or screw connection.

In preferred embodiments, the coupling rod and the transducer rod or the coupling rod and the Connecting cylinders welded together, so that a virtually one-piece connection between the transducer rod and the coupling rod and optionally provided therebetween connecting pieces, such as the connecting cylinder and the connecting bolt results.

In preferred embodiments, the transducer rod is aligned coaxially with the facing first part of the coupling rod, so that the provided with the ultrasonic transducer part of the tool part can be arranged with little space in a cylindrical housing body, which is suitable as a handle.

In all types of connection of the transducer rod with the coupling rod results in a compact design of the cutting tool. The transducer rod and the coupling rod preferably form a uniform metal body, so that a lossless coupling and a still compact design can be achieved.

Due to the advantageous embodiment of the tool part of the ultrasonic transducer can be provided with larger and more powerful piezoelectric elements, preferably hollow cylindrical or annular plates and still has compact dimensions. The annular piezoelectric disks may have an outer diameter which is a multiple of the inner diameter or the diameter of the transducer rod, so that ultrasonic waves with high energy can be transmitted to the coupling rod and the sonotrode.

Preferably, four to ten annular piezoelectric disks, which are separated from each other by contact elements, are connected in series. The contact elements, preferably Brass plates, preferably cover the piezoelectric elements over the entire surface and have connection contacts.

The piezoelectric elements and the contact elements which are seated on the transducer rod and which are preferably separated from the transducer rod by an insulation tube are pressed by the pressure element against a stop surface which is provided at the end of the connecting cylinder or the coupling rod facing the ultrasonic transducer. The abutment surface is preferably an annular surface that is congruent with the end face of the adjacent piezoelectric element. The mechanical ultrasound energy emitted by the piezoelectric elements therefore reaches the front of the stop surface to the connecting cylinder or directly to the coupling rod and the back of the contact pressure and the transducer rod to the connecting cylinder or directly to the coupling rod. There is thus a double coupling of the ultrasonic energy in the coupling rod.

The transducer rod preferably has an external thread, of which the provided with an internal thread pressing member is held. By turning the pressing element, the transducer block held between the pressing element and the stop surface can be pressed together.

The coupling rod has a circular, triangular, rectangular or polygonal cross-section, which is advantageously adapted to the range of operating frequencies used.

In preferred embodiments, temperature sensors are provided which are provided in openings in the coupling rod, in the connecting bolt, and / or in the transducer rod. The connecting cables of the sensors used are preferably arranged in a cable channel which extends coaxially through the transducer rod. On the basis of the temperature sensors, the temperatures of the coupling rod and the transducer rod can be measured. Depending on the measured temperatures, the ultrasonic generator can be advantageously controlled in order to reduce or completely avoid the emission of ultrasonic energy to the tool part under unfavorable working conditions. In this way, it is possible to detect an unfavorable operating behavior and to avoid damage to the tool part. Preferably, an additional piezoelectric element is provided, which can scan the vibrations on the transducer rod, on the connecting cylinder or on the coupling rod. By evaluating the amplitudes of the oscillations in the respective frequency ranges, it is possible to set optimum operating frequencies and to avoid operating frequencies at which no optimal energy transfer to the sonotrode or the processed product takes place.

The advantageous construction of the tool part thus makes it possible to assemble this in a simple manner and to integrate it into the housing part.

For this purpose, the transducer rod or the connecting cylinder or the coupling rod is preferably provided or connected to an outer flange, which is held by an inner flange which projects into the cross-section of the hollow cylindrical housing body.

In addition, the housing body preferably has an internal thread, which holds a threaded element provided with an external thread, such as a castellated nut, which holds the outer flange provided on the tool part on the Housing part provided inner flange can press. The threaded element is inserted into the hollow cylindrical housing body and screwed into the internal thread until the outer flange and the inner flange abut each other with the desired pressure. In particularly preferred embodiments, an elastic element between the inner flange and the outer flange is provided, which acoustically decouples the tool part and the housing part from each other.

Preferably, the inner flange is provided on the front side of the housing body. The tool part is therefore held on the front side in the housing body, which is why the back of the housing part relatively much space is available in which further device units can be arranged. For example, an ultrasonic generator is arranged there, to which a supply voltage can be supplied and which can deliver electrical ultrasonic signals in the frequency range from 25 kHz to 50 kHz. Preferably, a controllable ultrasonic generator is provided, which can if necessary generate the desired frequencies. Alternatively, electrical ultrasonic signals can also be supplied via a connection cable. In addition, inside the housing body, a power supply unit, e.g. a battery or an accumulator may be provided, which provides the electrical energy required for the hand tool. The supply voltage, e.g. a DC voltage, but can also be supplied via a connecting cable.

Within the housing body, a printed circuit board with electrical and electronic components is preferably arranged, by means of which a control and regulation of the hand tool is possible. Also the electrical modules of the Ultrasonic generator can be advantageously arranged on the circuit board.

Preferably, a flexible circuit board is used, which at least partially surrounds the transducer block or the connecting cylinder. In this way, the circuit board takes up little space and can be coupled in preferred embodiments with metal elements of the tool part. Preferably, an insulated metal substrate is used as a flexible printed circuit board, by means of which the heat loss of the electrical and electronic components removed and preferably to a metal body, e.g. the connecting cylinder, can be discharged.

To operate the hand tool, an operating ring is preferably provided, which encloses the housing body and is rotatably supported by this. By rotating the operating ring, which preferably comprises magnetic elements, electrical switching elements can be actuated to set a desired operating state of the hand tool.

Within the housing body, a cooling coil is preferably additionally provided, through which a cooling medium flows. The cooling coil can be advantageously connected to the metal substrate of the circuit board in order to cool it.

The coupling rod and the blade are adapted to the needs of the user. The coupling rod preferably extends arcuately and is preferably perpendicular to the tail of the blade with the tail, whereby an optimal coupling of the ultrasonic energy results.

The blade can be aligned with the cutting edge as needed forward, to the side or backwards. The hand tool can therefore be adapted to any work process. If necessary, it can also be provided that the sonotrode or the blade can be replaced.

Fig. 1

in einer vorzugsweisen Ausgestaltung ein erfindungsgemässes Handwerkzeug 10, welches ein Gehäuseteil 2 umfasst, in dem ein Werkzeugteil 1 gehalten ist, das einen Kopplungsstab 12 aufweist, der frontseitig mit einer Klinge 11 verbunden ist;

Fig. 2a

das Handwerkzeug 10 von Fig. 1 in einer Explosionsdarstellung mit dem entlang der Schnittlinie S--S von Fig. 3a aufgeschnittenen Gehäuseteil 2, einem Ultraschallwandler 15 mit einem Wandlerstab 151, der über einen Verbindungszylinder 14 und einen Verbindungsbolzen 13 mit dem zugewandten ersten Stabteil 121 des Kopplungsstabs 12 verbindbar und koaxial dazu ausgerichtet ist;

Fig. 2b

den Ultraschallwandler 15 von Fig. 2a in einer Explosionsdarstellung mit dem Wandlerstab 151, einem Isolationsrohr 153, ringförmigen Piezoelementen 154, ringförmigen Kontaktplatten 155 und einem Anpresselement 152;

Fig. 3a

eine Seitenansicht des Handwerkzeugs 10 von Fig. 1;

Fig. 3b

einen Schnitt durch das Handwerkzeug 10 entlang der in Fig. 3a gezeigten Schnittlinie S--S;

Fig. 4

einen Teil des Handwerkzeugs 10 von Fig. 3a mit einem ersten Schnitt entlang der Schnittlinie S--S durch den Verbindungszylinder 14 und den Gehäusekörper 21 und mit einem zweiten Schnitt senkrecht dazu durch eine Kronenmutter 22, mittels der der Verbindungszylinder 14 gegen einen frontseitig am Gehäusekörper 21 vorgesehenen Innenflansch 214 angedrückt wird;

Fig. 5a

einen Schnitt entlang der Schnittlinie S--S von Fig. 3a durch den Ultraschallwandler 15 und den Wandlerstab 151 sowie den Verbindungszylinder 14 und den Verbindungsbolzen 13, welcher den Verbindungszylinder 14 mit dem ersten Stabteil 121 des Kopplungsstabs 12 verbindet;

Fig. 5b

in der Schnittdarstellung von Fig. 5a den Verbindungszylinder 14, den Verbindungsbolzen 13 und das erste Stabteil 121 des Kopplungsstabs 12, die voneinander gelöst sind;

Fig. 6a

das Handwerkzeug 10 von Fig. 3a in einer weiteren vorzugsweisen Ausgestaltung mit einem Schnitt entlang der Schnittlinie S--S;

Fig. 6b

in der Schnittdarstellung von Fig. 6a den Verbindungszylinder 14 und das erste Stabteil 121 des Kopplungsstabs 12, die voneinander gelöst sind;

Fig. 7a

einen vorzugsweise ausgestalteten Verbindungszylinder 14 und einen dazu passenden Kopplungsstab 12, die voneinander getrennt sind;

Fig. 7b

in Schnittdarstellung den Verbindungszylinder 14 und den damit verbundenen Kopplungsstab 12 von Fig. 7a;

Fig. 8

einen vorzugsweise ausgestalteten Kopplungsstab 12, dessen erstes Stabteil 121 den Verbindungszylinder 14 bildet und dessen zweites Stabteil 122 eine Klinge 11 hält, die in einer Ebene senkrecht zum ersten Stabteil 121 ausgerichtet ist;

Fig. 9

einen vorzugsweise ausgestalteten Kopplungsstab 12, dessen erstes Stabteil 121 den Wandlerstab 151 bildet und dessen zweites Stabteil 122 eine Klinge 11 hält, die in einer Ebene parallel zum ersten Stabteil 121 ausgerichtet ist, welcher einen runden Querschnitt aufweist;

Fig. 10a

einen Kopplungsstab 12 mit dreieckigem Querschnitt;

Fig. 10b

einen Kopplungsstab 12 mit rechteckigen Querschnitt; und

Fig. 10c

einen Kopplungsstab 12 mit achteckigen Querschnitt.

The invention will be explained in more detail with reference to drawings. Showing:

Fig. 1

in a preferred embodiment, a hand tool according to the invention 10, which comprises a housing part 2, in which a tool part 1 is held, which has a coupling rod 12 which is connected at the front with a blade 11;

Fig. 2a

the hand tool 10 of Fig. 1 in an exploded view with the along the section line S - S of Fig. 3a cut housing part 2, an ultrasonic transducer 15 with a transducer rod 151 which is connected via a connecting cylinder 14 and a connecting pin 13 with the facing first rod portion 121 of the coupling rod 12 and aligned coaxially thereto;

Fig. 2b

the ultrasonic transducer 15 of Fig. 2a in an exploded view with the transducer rod 151, an insulating tube 153, annular piezo elements 154, annular contact plates 155 and a pressing member 152;

Fig. 3a

a side view of the hand tool 10 of Fig. 1 ;

Fig. 3b

a section through the hand tool 10 along the in Fig. 3a shown section line S - S;

Fig. 4

a part of the hand tool 10 from Fig. 3a with a first section along the section line S - S through the connecting cylinder 14 and the housing body 21 and with a second section perpendicular thereto by a castle nut 22, by means of which the connecting cylinder 14 is pressed against a front side provided on the housing body 21 inner flange 214;

Fig. 5a

a section along the section line S - S of Fig. 3a through the ultrasonic transducer 15 and the transducer rod 151 and the connecting cylinder 14 and the connecting bolt 13, which connects the connecting cylinder 14 with the first rod portion 121 of the coupling rod 12;

Fig. 5b

in the sectional view of Fig. 5a the connecting cylinder 14, the connecting pin 13 and the first rod part 121 of the coupling rod 12, which are disengaged from each other;

Fig. 6a

the hand tool 10 of Fig. 3a in a further preferred embodiment with a section along the section line S - S;

Fig. 6b

in the sectional view of Fig. 6a the connecting cylinder 14 and the first rod part 121 of the coupling rod 12, which are disengaged from each other;

Fig. 7a

a preferably designed connecting cylinder 14 and a mating coupling rod 12, which are separated from each other;

Fig. 7b

in a sectional view of the connecting cylinder 14 and the associated coupling rod 12 of Fig. 7a ;

Fig. 8

a preferably configured coupling rod 12, the first rod part 121 of which forms the connecting cylinder 14 and the second rod part 122 of which holds a blade 11 which is aligned in a plane perpendicular to the first rod part 121;

Fig. 9

a preferably designed coupling rod 12 whose first rod part 121 forms the transducer rod 151 and whose second rod part 122 holds a blade 11 which is aligned in a plane parallel to the first rod part 121, which has a round cross section;

Fig. 10a

a coupling rod 12 having a triangular cross section;

Fig. 10b

a coupling rod 12 having a rectangular cross section; and

Fig. 10c

a coupling rod 12 with octagonal cross-section.

Fig. 1 shows a hand tool 10 according to the invention in a preferred embodiment. The hand tool 10 comprises a tool part 1, which is held within a housing part 2, which comprises a hollow cylindrical housing body 21.

In the detailed representation of Fig. 1 It is shown that a connecting cylinder 14 protrudes from the housing body 21, which protrudes with a first rod portion 121 of a coupling rod 12th is connected, the second rod portion 122 is perpendicular to the back 112 of a blade 11. The blade 11 has the shape of a circle segment and comprises a cutting edge 111 running along the circular line. The blade 11 can also have a different course and, for example, form part of a polygon.

The housing body 21 also has an operating ring 24 on the front, which can be conveniently rotated to change the operating mode of the hand tool 10. For example, an ultrasonic generator can be switched on within the housing part 2. Preferably, suitable values for the frequency and / or the amplitude of the ultrasonic signals or preprogrammed operating modes can be selected, which were determined for the processing of the process material. On the back of the housing body 21 is closed by a closing element 23. In this embodiment, the hand tool 10 is provided with a connecting cable 7, via which a supply voltage or ultrasonic signals can be supplied. Preferably, the terminating element 23 has a plug connector, to which a cable 7 can be connected, via which a supply voltage and / or data can be transmitted. By means of the supply voltage, e.g. a rechargeable battery will be charged. By contrast, the hand tool can also be programmed by means of the transmitted data in order to adapt it to the intended use. For example, frequencies or frequency intervals are selected that are suitable for the processing of a specific process material.

It can be seen that the hand tool 10 has a compact design and despite the relatively large tool part 1 has a relatively small housing part 2, which can be easily held with one hand. The blade 11 allows to cut a process material easily and precisely using ultrasound energy or to finely atomize a pulverulent process material, which is placed on the blade 11.

Fig. 2a shows the hand tool 10 of Fig. 1 in an exploded view. The housing part 2 with the housing body 21, the annular operating part 24 and the termination part 23 are cut along the longitudinal axis. The tool part 1 comprises an ultrasonic transducer 15, which in Fig. 2a as a unit and in Fig. 2b shown in exploded view.

The ultrasonic transducer 15 comprises six hollow-cylindrical or annular piezoelements 154, which are separated from one another by five annular contact elements or contact plates 155. The piezo elements 154 are configured disk-shaped and provided with a transfer opening 1541. For example, piezo elements 154 are provided with a thickness in a range of 2 mm-8mm. The contact elements 155 are e.g. Brass plates with a thickness in the range of 1 / 10mm - 1 / 2mm and also have a transfer opening 1551 on. In addition, the contact elements 155 are provided with connection contacts. Through the transfer openings 1541, 1551 a transducer rod 151 and an insulating tube 153 are passed, which isolates the piezo elements 154 and the contact elements 155 relative to the metal transducer rod 151.

The transducer rod 151 has an opening 1511 on the front side and an external thread on which a pressure element 152 is placed in order to clamp the piezo elements 154 and the contact elements 155 against each other. In the front opening 1511 is a temperature sensor 42nd used, by means of which the temperature of the ultrasonic transducer 15 can be measured.

In Fig. 2a is further shown that the transducer rod 151 is fixed by a press connection or screw in a first cylinder opening 141 which is provided on the ultrasonic transducer 15 facing the end of a connecting cylinder 14, as shown in FIG Fig. 4 shown in detail. At this end of the connecting cylinder 14, a stop surface A is provided, which has approximately the same cross-section as the piezoelectric element 154 applied thereto. The transducer block 158 with the piezo elements 154 and the intermediate contact elements 155 can thus be pressed by means of the pressing element 152 against the stop surface A, in order to achieve an optimal coupling. The transducer block 158 and the connecting cylinder 14 thus form a non-positively or positively connected unit, via which the ultrasonic waves can be optimally transmitted to the blade 11.

At the end facing the blade 11, the connecting cylinder 14 has a second cylinder opening 142, in which a second bolt part 132 of a connecting bolt 13 can be fixed by a press connection or screw connection. The connecting pin 13 also has a first pin part 131, which can be fixed in a rod opening 1210 of the first rod part 121 of the coupling rod 12 by a press connection or screw connection. The second rod portion 122 of the coupling rod 12 extends in an arc perpendicular to the back 112 of the blade 11 and is integrally connected thereto, preferably by welding.

It can be seen that the elements of the transmission chain for the ultrasonic signals are stably connected to one another and, with a compact construction of the tool part 1, a low-loss transmission of the ultrasonic signals to the blade can be achieved. In preferred embodiments, which are described below, this transmission chain is further simplified and shortened, so that a more compact design of the tool part and a virtually optimal transmission of the ultrasonic signals can be achieved.

The in Fig. 2a shown connecting cylinder 14 has an outer flange 144 which serves to mount the tool part 1 within the housing body 21, which has an inner flange 214 on the front side. Furthermore, the housing body 21 has an internal thread 210 into which a threaded element provided with an external thread 221, namely the illustrated crown nut 22, can be screwed. By means of the castle nut 22, the outer flange 144 of the connecting cylinder 14 can be pressed against the inner flange 214 of the housing body 21 in order to fix the tool part 1 within the housing part 2. Preferably, between the inner flange 214 and the outer flange 144, an elastic member which holds the two interconnected parts mechanically safe and prevents the transmission of ultrasonic energy, however.

Fig. 2a further shows a flexible circuit board 3 with electrical elements 31, 32, for example multicolored LEDs, which signal the operating state of the hand tool 10. The operating ring 24 can therefore be rotated until the LEDs 31, 32 indicate that the desired mode of operation has been achieved. The flexible circuit board 3, preferably a bendable insulated Metal substrate IMS, is equipped with electrical and electronic components, which preferably perform the control and monitoring of the entire hand tool 10. Furthermore, the modules of the ultrasound generator 30 can be arranged on the printed circuit board 3.

Fig. 2b shows that the ultrasonic generator 30 is connected via generator lines 150 to the terminals of the contact elements 155, so that electrical alternating voltages in the ultrasonic range can be applied to the clamped piezo elements 154, whereby they are deformed accordingly.

The ultrasound generator 30 is connected to a power supply unit 300, which is likewise arranged in the hand tool 10 in the form of a rechargeable battery or batteries. Alternatively, a supply voltage via a connecting line 7, as in Fig. 1 shown, are supplied.

The ultrasound generator 30 is further connected to a control unit 350, by means of which the ultrasound generator 30 is preferably controllable such that ultrasound signals having the desired operating frequency and amplitude are emitted. Furthermore, intervals can be programmed by means of which the operating frequency is changed or keyed. As mentioned, the control unit 350 can be arranged on the flexible circuit board 3.

The flexible circuit board 3 is preferably bent cylindrically with a radius which is slightly smaller than the inner radius of the hollow cylindrical housing body 21. In this way, a relatively large-area circuit board with small space requirements are integrated into the housing body 21.

Fig. 3a shows a side view of the hand tool 10 of Fig. 1 and a section line SS.

Fig. 3b shows a section through the hand tool 10 along in Fig. 3a The elements of the tool part 1 and the housing part 2 and the elements of the flexible printed circuit board 3, on which optionally the control unit 350 and the ultrasonic generator 30 are realized, have already been described. By contrast, the generator lines 150 connected to five contact elements 155, two measuring lines 410 and 420, which are routed to the first and the second temperature sensors 41, 42, and further electrical lines 310 are shown. All schematically shown lines 150, 310, 410 and 420 can be led to a control unit 350 and / or to an ultrasonic generator 30, which are arranged on the flexible circuit board 3 or outside the hand tool 10. Furthermore, switches may be provided by means of which the lines 150, 310, 410 and 420 are interrupted or closed.

In Fig. 3b Furthermore, a cooling coil 5 is shown through which a coolant can be passed to dissipate heat from the interior of the housing body 21. In preferred embodiments, the cooling coil 5 encloses the ultrasonic transducer 15, so that its temperature can be regulated to an ideal value and heat loss can be dissipated.

Fig. 4 shows a part of the hand tool 10 of Fig. 3a with a first section along the section line S - S through the connecting cylinder 14 and the housing body 21 and a second section perpendicular thereto through the castle nut 22, by means of which the connecting cylinder 14 is pressed against the front side provided on the housing body 21 inner flange 214 at. Particularly well recognizable is the close coupling of the ultrasonic transducer 15, which is pressed by means of the pressing element 152, for example a press nut with an internal thread, against the connecting cylinder 14.

Fig. 5a shows a section along the section line S - S of Fig. 3a by the ultrasonic transducer 15 and the transducer rod 151 and the connecting cylinder 14 and the connecting bolt 13, which connects the connecting cylinder 14 with the first rod portion 121 of the coupling rod 12.

Fig. 5b shows in the sectional view of Fig. 5a the connecting cylinder 14, the connecting bolt 13 and the first rod part 121 of the coupling rod 12, which are detached from each other.

Fig. 6a shows the hand tool 10 of Fig. 3a in a further preferred embodiment with a section along the section line S - S. In this embodiment, the use of the in Fig. 4 omitted connecting bolt 13 is omitted. Instead, on the first rod part 121 of the coupling rod 12, a rod pin 1211 is formed, which is inserted into the front-side cylinder opening 142 of the connecting cylinder 14. The rod pin 1211 is preferably connected to the connecting cylinder 14 by a press connection and / or a screw connection and / or a welded connection. The detailed representation of Fig. 6a shows a view of the front side of the connecting cylinder 14, a weld 6, the connecting cylinder 14 with the first rod portion 121 of Coupling rod 12 connects. By dispensing with the connecting pin 13 reduces the transmission chain, which is why a closer coupling of the ultrasonic transducer 15 to the sonotrode or blade 11 results.

In this embodiment, the orientation of the blade 11 in the manner of a Kebab knife with backward cutting edge 111 is further observed. The embodiment shows that by means of the inventive hand tool 10, by appropriate alignment of the blade 11, virtually all manually possible cutting operations can be advantageously realized.

Fig. 6b shows in the sectional view of Fig. 6a the connecting cylinder 14 and the first rod part 121 of the coupling rod 12, which are detached from each other.

Fig. 7a shows a preferably designed connecting cylinder 14 and a mating coupling rod 12, which are separated from each other. The connecting cylinder 14 has a hollow cylindrical connecting bolt 143, which can be inserted into a rod opening 1210 in the first rod part 121 of the coupling rod 12. This embodiment has the advantage that measuring cables can be guided to the coupling rod 12 in order to contact a sensor provided in the rod opening 1210, for example a temperature sensor 41 or else an ultrasonic sensor or a piezoelement. Again, this results in a close coupling of the ultrasonic transducer 15 to the blade 11th

Fig. 7b shows a sectional view of the coupling cylinder 14 connected to the coupling rod 12 of Fig. 7a ,

Fig. 8 shows a sectional view of a preferably designed coupling rod 12, the first rod portion 121 forms the connecting cylinder 14 and the second rod portion 122 holds a blade 11 which is aligned in a plane perpendicular to the first rod portion 121. The first rod part 121 is thus formed at the end as a connecting cylinder 14. The in the FIGS. 2a, 2b and 4 shown transducer rod 151 can thus be connected directly to the coupling rod 12. The transducer block 158 is thereby pressed directly against the stop surface A on the first rod part 121, so that a nearly optimal coupling results.

Fig. 9 shows a further preferably designed coupling rod 12, the first rod portion 121 forms the transducer rod 151 and the second rod portion 122 holds a blade 11 which is aligned in a plane parallel to the first rod portion 121, which has a round cross-section. The first rod part 121 of the coupling rod 12 thus simultaneously forms the transducer rod 151 at the end, which preferably has the same dimensions as the transducer rod 151 of FIG Fig. 2a , In this embodiment of the invention, the transducer block 158 is thus coupled with the piezo elements 154 directly to the coupling rod, which is why a direct coupling takes place without transmission losses. Preferably, the cross section of the piezo elements 154 is adapted to the cross section of the stop surface A provided on the coupling rod, or vice versa.

The Figures 9, 10a, 10b and 10c show that the coupling rod 12 may have a matched to the operating frequencies and to the application cross-section.

Fig. 9 shows a coupling rod 12 with a round cross-section. Fig. 10a shows a coupling rod 12 with triangular cross-section. Fig. 10b shows a coupling rod 12 with a rectangular cross-section. Fig. 10c shows a coupling rod 12 with octagonal cross-section.

References

1

tool part

10

hand tool

11

blade

111

cutting edge

112

blade back

12

coupling rod

121

first part of the rod

1210

rod aperture

1211

rod bolts

122

second rod part

13

connecting bolts

131

first bolt part

132

second bolt part

14

connecting cylinder

141

first cylinder opening

142

second cylinder opening

143

cylinder bolt

144

outer flange

15

ultrasound transducer

150

generator lines

151

converter staff

1511

location hole

152

presser

153

insulating tube

154

piezo elements

1541

Transfer opening in the piezo element

155

contact element

1551

Transfer opening in the contact elements

158

transducer block

2

housing part

21

housing body

210

inner thread

214

inner flange

22

Threaded element, castellated nut

221

external thread

23

termination element

24

operation ring

3

flexible circuit board

30

ultrasonic generator

300

Power supply unit

31, 32

electrical elements

310

electric lines

350

control unit

41

first temperature sensor

410

first sensor line

42

second temperature sensor

420

second sensor line

5

cooling coil

6

Weld

7

connection cable

Claims (15)

1. Hand tool (10) with a tool part (1) that is held in a preferably hollow cylindrical housing body (21) of a housing part (2) and that comprises an ultrasonic transducer (15) with at least one piezo element (154), which serves for delivering ultrasonic energy to a blade (11) that is connected to the tool part (1), characterised in that a plurality of piezo elements (154) are provided, which are separated from one another by contact elements (155) and which comprise each a transfer opening (1541), which is traversed by a transducer rod (151) that is connected, directly or indirectly, to a coupling rod (12) that is connected in one piece to the blade (11) and that a pressing element (152) is provided that is connected to the transducer rod (151) and that presses the piezo elements (154) against a locating surface (A) of an element which is connected, directly or indirectly, to the coupling rod (12) and which mechanically couples the piezo elements (154) with the coupling rod (12).
2. Hand tool (10) according to claim 1, characterised in that the transducer rod (151) that preferably is a metal rod and that is separated from the piezo elements (154) by a insulation tube (153),

   a) is a part of the coupling rod (12) and is therefore connected in one piece with the coupling rod (12); or

   b) is held at the front side by a press fitting or a threaded connection in a rod opening (1210) provided in the coupling rod (12); or

   c) is held at the front side by a press fitting or a threaded connection in a first cylinder opening (141) of a connecting cylinder (14) that is connected to the coupling rod (12).
3. Hand tool (10) according to claim 2, characterised in that the connecting cylinder (14)

   a) is part of the coupling rod (12) and therefore connected to the coupling rod (12) in one piece; or

   b) comprises on the front side a second cylinder opening (142), in which a rod bolt (1211) that is provided on the coupling rod (12) is held by a press fitting or a threaded connection; or

   c) comprises on the front side a massive or hollow cylindrical cylinder bolt, which is held within the rod opening (1210) by a press fitting or a threaded connection; or

   d) comprises on the front side a second cylinder opening (142), in which a first bolt member (131) of a connecting bolt (13) is held by a press fitting or a threaded connection and that in the rod opening (1210) of the connecting cylinder (14) a second bolt member (132) of the connecting bolt (13) is held by a press fitting or a threaded connection.
4. Hand tool (10) according to claim 2 or 3, characterised in that the coupling rod (12) and the transducer rod (151) or the coupling rod (12) and the connecting cylinder (14) are welded together.
5. Hand tool (10) according to one of the claims 1 - 4, characterised in that the locating surface (A) is preferably an annular ring area that is provided on the end piece of the connecting cylinder (14) or of the coupling rod (12), which is facing the ultrasonic transducer (15), and wherein the coupling rod (12) comprises a circular, triangular, rectangular or square cross section.
6. Hand tool (10) according to claim 2 or 3, characterised in that in the rod opening (1210) of the coupling rod (12) and/or in an opening of the connecting bolt (13) and/or in a back-sided opening (1511) in the transducer rod (151) a temperature sensor (41; 42) is located.
7. Hand tool (10) according to one of the claims 1 - 6, characterised in that the piezo elements (154), which are pressed against one another, have a hollow cylindrical design or an annular design and form a cylindrical transducer block (158) and that the pressing element (152) comprises an internal thread, that is engaged in an external thread of the transducer rod (151).
8. Hand tool (10) according to claim 2 or 3, characterised in that the transducer rod (151) or the connecting cylinder (14) or the coupling rod (12) are provided with or connected to an outer flange (144), which is held by an inner flange (214) that extends into the cross-section of the hollow cylindrical housing body (21) .
9. Hand tool (10) according to claim 8, characterised in that the housing body (21) comprises an internal thread (210), which holds a threaded element (22), such as a crown nut, that process the outer flange (144) against the inner flange (214), which is provided preferably at the front side of the housing body (21).
10. Hand tool (10) according to one of the claims 1 - 9, characterised in that a flexible printed circuit board (3) is provided, which at least partially encloses the transducer block (158) or the connecting cylinder (14) and which is equipped with the electronic modules and electrical switching elements (350) that serve for controlling the tool (10).
11. Hand tool (10) according to claim 10, characterised in that the housing body (21) is surrounded by a rotatable control ring (24), with which the electrical switching elements (350) can be operated.
12. Hand tool (10) according to one of the claims 1 - 11, characterised in that a local power supply unit (300) is provided or that electrical energy can be supplied via a connecting cable (7) and that a ultrasonic generator (30) is enclosed in the housing part (2) or that the hand tool (10) is connectable to an ultrasonic generator.
13. Hand tool (10) according to one of the claims 1 - 12, characterised in that a cooling coil (5) is provided within the housing body (21), through which a cooling agent is guidable.
14. Hand tool (10) according to one of the claims 1 - 13, characterised in that the coupling rod (12) is curved and stands with the front sided end piece end piece (122) perpendicularly on the back (112) of the blade (11) .
15. Hand tool (10) according to one of the claims 1 - 14, characterised in that the cutting edge (111) of the blade (11) is directed forwards, backwards or to the side.

Images