EP2853364A1 - Handheld tool for machining a process material - Google Patents

Abstract

The hand tool (10) comprises a tool part (1), which is held in a preferably wooden-cylindrical housing body (21) of a housing part (2) and which comprises an ultrasound transducer (15) provided with at least one piezo element (154) and capable of emitting ultrasonic energy to a provided on the tool part (1) blade (11) is used. According to the invention, a plurality of piezoelements (154) are provided which are separated from one another by contact elements (155) and each have a transfer opening (1541) through which a transducer rod (151) passes, which is connected in one piece or directly or indirectly to a coupling rod (12) which is integrally connected to the blade (11) and in that a pressure element (152) connected to the transducer rod (151) is provided, by means of which the piezo elements (154) are pressed against a stop (A) and mechanically connected to the coupling rod (12). are coupled.

Description

The invention relates to a hand tool for processing, in particular for cutting a process material using ultrasound energy and a device with at least one such knife.

In many industrial applications, especially in the food industry, products of the intended dimensions must be provided. Often bread, meat products, in particular sausages, or cheese are divided into pieces and packed. For this purpose, cutting tools are used by means of which the process material is divided using ultrasound energy. Devices of this kind are known from EP2551077A1 known. These devices include holding devices and guiding devices by means of which the cutting tools are held and guided in order to process the process material.

Often a process material is also to be processed manually. For example, to inspect a product, cuts are made through a processed process good to determine the quality. In a shop, for example in a bakery or a butchery, 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.

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 also be constructed stably, so that mechanically solid process material can be processed over a longer period of time without the occurrence of signs of wear.

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 wooden-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 piezo elements separated by contact elements are provided, each having a transfer opening through which a transducer rod is passed, which is integrally or directly or indirectly connected to a coupling rod which is integrally connected to the blade and that one connected to the transducer rod Pressing element is provided, by means of which the piezo elements are pressed against a stop 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 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 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 holzzylindrischen 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 on the front side a solid or wood-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 cylinder are 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 powerful piezoelectric elements, preferably wood cylindrical or annular plates and still has compact dimensions. The annular piezoelectric disks can have an outer diameter, which is a Has multiple of the inner diameter or the diameter of the transducer rod, so that ultrasonic waves can be transmitted with high energy 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, cover the piezoelectric elements preferably 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 advantageous 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 connection lines of the sensors used are preferably arranged in a cable channel which extends coaxially through the transducer rod. Based on the temperature sensors, the temperature 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 frequency at which no optimum energy transfer to the sonotrode or the processed product takes place.

The advantageous construction of the tool part is thus allowed to build this together in a simple manner and to integrate 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 wood-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 can press the outer flange provided on the tool part against the inner flange provided on the housing part. The threaded element is inserted into the wood-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. Likewise, within the housing body, a power supply unit, for example a battery or an accumulator may be provided, which provides the electrical energy required for the hand tool. The supply voltage, for example, 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. 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, such as 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 on the back of the blade, resulting in an optimal coupling of the ultrasonic energy.

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 Figur 1 in einer Explosionsdarstellung mit dem (entlang der Schnittlinie S-S von Figur 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 in einer Explosionsdarstellung mit dem Wandlerstab 151, einem Isolationsrohr 153, ringförmigen Piezoelementen 154, ringförmigen Kontaktplatten 155 und einem Anpresselement 152;

Fig. 3a

einer Seitenansicht des Handwerkzeugs 10 von Figur 1;

Fig. 3b

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

Fig. 4

einen Teil des Handwerkzeugs 10 von Figur 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 Figur 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 Figur 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 Figur 3a in einer weiteren vorzugsweisen Ausgestaltung mit einem Schnitt entlang der Schnittlinie S--S;

Fig. 6b

in der Schnittdarstellung von Figur 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

den Verbindungszylinder 14 und den Kopplungsstab 12 von Figur 7a miteinander verbunden in Schnittdarstellung;

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 SS 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 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 SS 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

the connecting cylinder 14 and the coupling rod 12 of Figure 7a interconnected in sectional view;

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 wood-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 is connected to a first rod portion 121 of a coupling rod 12, the second rod portion 122 perpendicular to the Back 112 of a blade 11 is. The blade 11 has the shape of a circle segment and comprises a cutting edge 111 running along the circumference.

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. Furthermore, preferably the frequency and the amplitude of the ultrasonic signals or preprogrammed modes can be selected. 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, for example, an accumulator can be charged. By contrast, by means of the data, the hand tool can also be programmed to adapt it to the intended use. For example, frequencies or frequency intervals are selected which are optimal 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 now allows a process material to be cut 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 for example 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, a temperature sensor 42 is 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 piezzo element 154 resting thereon. 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 to fix the tool part 1 within the housing part 2, preferably between the inner flange 214 and the outer flange 144 is an elastic element which the two together mechanically holding connected parts and preventing the transmission of ultrasonic energy.

FIG. 2a further shows a flexible printed circuit board 3 with electrical elements 31, 32, for example multi-color 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 printed 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 terminal contacts of the contact elements 155, so that electrical alternating voltages in the ultrasonic range clamped to the Piezo elements 154 can be applied, 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 wood-cylindrical housing body 21. In this way, a relatively large-scale circuit board with a small space requirement can be 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. On the other hand, the generator lines 150 connected to five contact elements 155, two measuring lines 410 and 420, are the first and the second Temperature sensor 41, 42 are guided, and further electrical lines 310 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 the connecting cylinder 14 against the front provided on the housing body 21 inner flange 214 is pressed. 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 SS 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 SS. 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, which connects the connecting cylinder 14 with the first rod portion 121 of the coupling rod 12. 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.

Figure 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 wood-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 also 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 Figure 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 example 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 forms an end thus at the same time the transducer rod 151, which preferably has the same dimensions as the transducer rod 151 of 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 cables

Claims (15)

Hand tool (10) with a tool part (1) which is held in a preferably wooden cylindrical housing body (21) of a housing part (2) and which comprises a with at least one piezoelectric element (154) provided with ultrasound transducer (15), for the delivery of ultrasonic energy a provided on the tool part (1) blade (11), characterized in that a plurality of contact elements (155) are provided separate piezo elements (154), each having a transfer opening (1541) through which a transducer rod (151) passed is, which is integrally or directly or indirectly connected to a coupling rod (12) which is integrally connected to the blade (11) and that a with the transducer rod (151) connected to pressing element (152) is provided, by means of which the piezo elements (154 ) are pressed against a stop surface (A) and mechanically coupled to the coupling rod (12). Hand tool (10) according to claim 1, characterized in that the transducer rod (151), preferably a metal rod, which is separated by an insulating tube (153) from the piezo elements (154), a) a part of the coupling rod (12) and thereby integrally connected thereto; or b) is held at the front by a press connection or screw connection in a rod opening (1210) in the coupling rod (12); or c) at the front by a press connection or screw connection in a first cylinder opening (141) of a connecting cylinder (14) is connected to the coupling rod (12). Hand tool (10) according to claim 2, characterized in that the connecting cylinder (14) a) a part of the coupling rod (12) and thereby integrally connected thereto; or b) has a second cylinder opening (142) on the front side, in which a bar bolt (1211) provided on the coupling rod (12) is held by a press connection or screw connection; or c) has on the front a solid or wood-cylindrical cylinder pin, which is held by a press connection or screw connection within the rod opening (1210); or d) has on the front side a second cylinder opening (142) in which a first bolt part (131) of a connecting bolt (13) is held by a press connection or screw connection and in that the rod opening (1210) has a second bolt part (132) of the connecting bolt (13) is held by a press connection or screw connection. Hand tool (10) according to claim 2 or 3, characterized in that the coupling rod (12) and the transducer rod (151) or the coupling rod (12) and the connecting cylinder (14) are welded together. Hand tool (10) according to one of claims 1 - 4, characterized in that the stop surface (A), preferably a circular ring surface on which the ultrasonic transducer (15). facing the end of the connecting cylinder (14) or the coupling rod (12) is provided, which has a circular, triangular, rectangular or polygonal cross-section. Hand tool (10) according to claim 2 or 3, characterized 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 rear opening (1511) in the transducer rod (151 ) a temperature sensor (41, 42) is arranged. Hand tool (10) according to any one of claims 1-6, characterized in that the mutually pressed piezoelectric elements (154) are configured as hollow cylindrical or annular and form a cylindrical transducer block (158) and that the contact pressure element (152) has an internal thread, of a External thread of the transducer rod (151) is held. Hand tool (10) according to claim 2 or 3, characterized in that the transducer rod (151) or the connecting cylinder (14) or the coupling rod (12) with an outer flange (144) is provided or held by an inner flange (214) is, which projects into the cross section of the wood-cylindrical housing body (21). Hand tool (10) according to claim 8, characterized in that the housing body (21) has an internal thread (210) holding a threaded element (22), such as a castle nut, which presses the outer flange (144) against the inner flange (214) , which is preferably arranged on the front side of the housing body (21). Hand tool (10) according to any one of claims 1-9, characterized in that a flexible printed circuit board (3) is provided, which at least partially surrounds the transducer block (158) or the connecting cylinder (14) and which with electronic components and electrical switching elements (350 ), which serve to control the hand tool (10). Hand tool (10) according to claim 10, characterized in that the housing body (21) by a rotatably held operating ring (24) is enclosed, by means of which the electrical switching elements (350) are actuated. Hand tool (10) according to any one of claims 1-11, characterized in that a local power supply unit (300) is provided, or that electrical energy via a connecting cable (7) can be fed and that an ultrasonic generator (30) enclosed in the housing part (2) or that the hand tool (10) is connectable to an ultrasonic generator. Hand tool (10) according to any one of claims 1-12, characterized in that within the housing body (21) a cooling spiral (5) is provided, through which a cooling medium can be guided. Hand tool (10) according to any one of claims 1-13, characterized in that the coupling rod (12) extends arcuately and with the front end piece (122) perpendicular to the back (112) of the blade (11). Hand tool (10) according to any one of claims 1-14, characterized in that the blade (11) is aligned with the cutting edge (111) to the front, to the side or backwards.

Images