CN114846906A

CN114846906A - Portable multipurpose melting appliance and equipment with same

Info

Publication number: CN114846906A
Application number: CN202080088185.XA
Authority: CN
Inventors: J·韦斯内尔; M·卡茨; M·法贝尔; A·罗约; F·法登雷希特; C·克拉默; M·施皮尔哈根; T·埃策尔; P·J·埃尔南德斯布拉斯科; S·略伦特希尔
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2019-12-19
Filing date: 2020-11-18
Publication date: 2022-08-02
Also published as: EP4079104A1; WO2021121842A1; DE102019220217A1

Abstract

The invention relates to a portable multipurpose melting device (110, 300, 350, 450, 650, 850) having at least one inductively heatable heating tip (152) for melting a melting cartridge (130) made of different meltable materials, wherein at least one heating element (170, 264, 274, 284, 294, 296, 370, 410) connected to the heating tip (152) and/or the heating tip (152) can be heated only to a predefined maximum temperature.

Description

Portable multipurpose melting appliance and equipment with same

Technical Field

The invention relates to a portable multipurpose melting appliance having at least one inductively heatable heating tip for melting cartridges formed from different meltable materials. The invention further relates to a device having at least one such portable multipurpose melting appliance and having a base station.

Background

From the prior art, induction-heatable, cordless and therefore mobile multipurpose melting appliances in the form of hot-melt adhesive pens are known, wherein the heating of the hot-melt adhesive pens takes place in each case in an associated base station. At least in the base station, complex regulating electronics are required in order to avoid overheating of the hot melt adhesive pens which are temporarily inserted into the base station for heating in each case. If the hot melt adhesive pen has additional heating means, which are independent of the base station, for an extended period of use, active electronic components, such as complex temperature-regulating electronics and electrical energy stores, are likewise provided within the hot melt adhesive pen, whereby the complexity of the overall system is further increased.

Disclosure of Invention

The invention relates firstly to a portable multipurpose melting appliance having at least one inductively heatable heating tip for melting cartridges formed from different meltable materials. The at least one heating element connected to the heating tip and/or the heating tip can only be heated to a predefined maximum temperature.

It should be noted that within the scope of the present invention, the term "portable multipurpose melting appliance" relates to a hand-held multipurpose melting appliance. The multipurpose melting appliance can preferably be operated cordless or wireless and is therefore mobile.

The invention thus enables an improved self-regulation of the heating tip of the multipurpose melting appliance in terms of structure and/or presettable temperature by appropriate material selection. At a predeterminable maximum temperature, application-specific plasticization of the material of the melting cylinder is preferably ensured. Therefore, complicated and therefore expensive electronic regulating devices inside the utility melting appliance and/or in the base station are dispensable. A particularly simple construction can be achieved in the case of a heating tip which simultaneously functions as a heating element. In contrast, the provision of an additional heating element enables the heating tip to be constructed from any metal, such as an aluminium alloy or aluminium, which has a good heat storage capacity that maximises the service life. The at least one heating element which is fixedly connected to the heating tip can in principle have any desired shape.

Preferably, at least one heating element connected to the heating tip and/or the heating tip has a ferromagnetic alloy assigned a defined curie temperature of between approximately 75 ℃ and 750 ℃.

In this way, a plurality of materials or substances can be melted and subsequently processed by means of the multipurpose melting device.

Preferably, a pen-shaped housing is provided, which has a supply section, an interior space for receiving at least one melting cartridge, and a grip section for gripping on the user side in the vicinity of the heating tip, wherein preferably the grip section at least partially surrounds the heating tip for thermal insulation. The pen-shaped housing is preferably designed substantially rotationally symmetrically with respect to the longitudinal center axis.

The multipurpose melting device thus has a manual operation according to conventional writing instruments and can thus be used intuitively, variously, flexibly and inventively by the user.

According to a preferred embodiment, the heating tip is embodied as a nozzle having a nozzle chamber and a discharge opening of reduced diameter for melting the molten material of the cartridge.

The multipurpose melting device can thus be used as a universal application device for applying different meltable materials, such as plastics, waxes or foodstuffs, to workpieces. In the case of the heating tip of the multipurpose melting appliance not being embodied as a hollow nozzle with an outlet opening, but as a solid body, completely new application possibilities are opened up, such as soldering, hot cutting of plastics, burning decorations on wood, etc.

Preferably, the nozzle is connected to at least one heating element which is approximately hollow-cylindrical, hollow-truncated-cone, cylindrical-shell, truncated-cone-shell and/or strip-shaped.

Different options are thereby obtained with regard to the heat transfer between the heating element and the nozzle and the location of the heat introduction into the nozzle. The heating element is preferably fixedly connected to the nozzle body of the nozzle in order to achieve as low a heat transfer resistance as possible.

Preferably, the nozzle has a self-closing and spring-loaded ball valve. The ball of the ball valve is preferably axially preloaded by means of a frustoconical compression spring.

The coating result can thereby be further improved by means of the multipurpose melting appliance. In addition, the molten material of the melting barrel is reliably prevented from dripping out of the nozzle of the multipurpose melting appliance. Furthermore, the rotatable reception of the ball valve in the nozzle makes it easy for the user to guide the nozzle over the surface of the workpiece, since only a significantly reduced rolling resistance has to be overcome.

Preferably, the heating element of the nozzle is arranged between a shoulder of the nozzle and a metal ring which is fixedly connected, preferably pressed or heat shrunk, to the nozzle.

Thereby simplifying the manufacture of the multipurpose melting appliance. In particular, by an axial movement of the heating element relative to the central plane of the coil of the induction heating device before the final fixing of the metal ring, a simple adjustment of the temperature of the heating element is possible during the manufacturing process in the base station or in a manufacturing aid which functions in common with the base station.

Preferably, the heating element is pretensioned axially in the direction of the outlet opening of the nozzle by means of a spring element supported between the shoulder and the metal ring. The metal ring and the nozzle are preferably made of the same metal and/or the same metal alloy in order to avoid thermal stresses.

In this way, tolerances due to manufacturing technology, alloy-induced fluctuations in the curie temperature of the heating element and thermal stresses can also be compensated for after the metal ring has been fixed to the nozzle.

Preferably, the heating element has a plurality of rectangular, trapezoidal or V-shaped, axially blind recesses, preferably arranged uniformly spaced apart from one another on the circumferential side, on the end section pointing away from the outlet opening of the nozzle.

This opens up a further possibility for adjusting the temperature of the heating element and thus of the temperature that can be achieved in the nozzle of the multipurpose melting appliance concerned.

According to an advantageous further development of the multipurpose melting device, a feed device for the melting barrels is associated with the multipurpose melting device, wherein the melting barrels are axially preloaded in the direction of the nozzle by means of a compression spring, and the feed device has at least one radially outwardly resiliently preloaded actuating element with an integrated cutting clamp.

The melting cartridge is thereby moved comfortably and ergonomically for the user for plasticizing additional material inside the nozzle of the multipurpose melting appliance. Continuous and at least virtually fatigue-free operation with a pen-shaped multipurpose melting device is therefore also possible if necessary (in addition to the replacement of the melting cartridges).

In one embodiment, the melting cartridge is held axially by means of an associated cutting clamp when at least one operating element is released on the user side. The cutting clamp is preferably formed by a beveled surface and a cutting edge.

This provides a robust and structurally simple feed device which reliably prevents the melting of the melting cartridge when the operating element is not actuated.

Preferably, the melting cartridge can be released by pressing the at least one operating element radially inwardly on the user side and can be fed in the direction of the nozzle by means of a pressure spring.

Thus, a user of the multipurpose melting appliance is able to dose additional material to the nozzle for melting and application to a workpiece with one hand.

The invention further provides a device having at least one portable utility melting appliance and having an external base station having at least one receiving well with an induction heating device, wherein at least one heating tip of the at least one utility melting appliance can be received at least partially in the at least one receiving well for induction heating by means of the induction heating device.

The invention can thus provide a device having the at least one portable utility melting appliance and a base station, in which device an improved self-regulation of the specifiable temperature of the heating tip of the utility melting appliance can be achieved in terms of construction and/or by corresponding material selection.

Preferably, the base station has at least two receiving wells for a portable multipurpose melting appliance.

In this way, a plurality of simple and thus cost-effective multipurpose melting devices can be used for melting cartridges made of different materials on a single compact base station.

Preferably, the receiving wells of the base station are each configured at an angle of preferably between 0 ° and 60 ° inclined to the vertical of the base. The angle may be variable as necessary.

Thus, the ergonomics of the device can be further optimized for the user.

Drawings

The invention is explained in detail in the following description with the aid of embodiments shown in the drawings. The figures show:

fig. 1 is a schematic longitudinal section of an apparatus according to the invention, with a multipurpose melting appliance received in a base station,

figure 2 is an enlarged longitudinal cross-section of the multipurpose melting appliance of figure 1,

figure 3 is an enlarged longitudinal cross-section of the nozzle of the multipurpose melting appliance of figure 1,

fig. 4 is a schematic view of the nozzle of fig. 3, having a heating element according to another embodiment,

fig. 5 is a schematic view of the nozzle of fig. 4, with an alternative heating element,

fig. 6 is a schematic view of the nozzle of fig. 4, with a heating element according to another embodiment,

fig. 7 is a schematic view of the nozzle of fig. 4, with an alternative heating element,

figure 8 is a partial longitudinal cross section of a multi-purpose melting appliance with another embodiment of the nozzle of the ball valve in a closed position,

figure 9 is a longitudinal section of the nozzle of figure 8 in the open state of the ball valve,

figure 10 is a schematic partial longitudinal cross-section of another embodiment of a multipurpose melting appliance insertable into the apparatus of figure 1,

figure 11 is a schematic perspective view of the heating element of the nozzle of the multipurpose melting appliance of figure 10,

FIG. 12 is a schematic view of another embodiment of a heating element for the nozzle of the multipurpose melting appliance of FIG. 10,

FIG. 13 is a schematic partial top view of an alternative embodiment of a multi-purpose melting appliance having an embodiment of a feed device,

figure 14 is a longitudinal cross-section of the multipurpose melting appliance of figure 13,

figure 15 is a schematic longitudinal cross-section of another embodiment of a feed device of the multipurpose melting appliance of figure 13,

figure 16 is a schematic longitudinal cross-section of another embodiment of a feed device of the multipurpose melting appliance of figure 13,

figure 17 is a schematic longitudinal cross-section of another embodiment of a feed device of the multipurpose melting appliance of figure 13,

figure 18 is a longitudinal cross section of a multipurpose melting appliance in an alternative embodiment to the other embodiment with a feed device,

fig. 19 is a longitudinal cross-sectional view of the multipurpose melting appliance of fig. 18, with another embodiment of the feeder device,

fig. 20 is a longitudinal cross-sectional view of the multipurpose melting appliance of fig. 18, with an alternative embodiment of the feeder device,

fig. 21 is a longitudinal cross-sectional view of the multipurpose melting appliance of fig. 18, with another embodiment of the feeder device,

figure 22 is a longitudinal cross-section of another embodiment of a multipurpose melting appliance,

FIG. 23 is an enlarged view of detail A of FIG. 22, an

Fig. 24 is an enlarged view of a portion B of fig. 22.

In the figures, elements having the same or similar function are provided with the same reference numerals and are described exactly once.

Detailed Description

FIG. 1 shows an exemplary apparatus 100 having an exemplary portable multi-purpose melting appliance 110 received in a base station 104. The base station 104 illustratively includes at least one receiving well 106 having an induction heating unit 150. In the at least one receiving well 106, a heating tip 152 of the at least one multipurpose melting appliance 110 can be received at least partially as shown by means of an induction heating device 150 for induction heating. The base station 104 may have two or any number of structurally identical receiving wells 106 for receiving additional portable multi-purpose melting appliances 110, not shown. In this case, an induction heating device 150 is preferably assigned to each receiving well.

The at least one receiving well 106 can preferably be embodied at an angle α of preferably between 0 ° and 60 ° (as indicated by the dashed outline and at an angle α of 45 °) with respect to the vertical 180 and the substrate 182 or work plane on which the device 100 is placed. The at least one induction heating device 150 is preferably able to supply the electrical energy required for operation without galvanic isolation using at least one power grid component 210, which is preferably designed according to the type of clocked, low-loss voltage converter.

The portable multi-purpose melting appliance 110 preferably has an approximately pen-shaped housing 120 preferably having a supply section 122, an interior space 124 for receiving at least one heat-plastifiable melting cartridge 130, a grip section 126 proximate the heating tip for gripping by a user, and an end section 128 directed away from the grip section 126. The pen-shaped housing 120 is preferably designed substantially rotationally symmetrically with respect to a central longitudinal axis 140, which coincides with the vertical line 180 when an angle α of the receiving well 106 is set here of approximately 0 ° with respect to the vertical line 180. The heating tip 152 is preferably at least partially surrounded by a sealing element 132 which, together with the stop 108 of the receiving well 106, forms an axial insertion boundary for the multipurpose melting appliance 110, so as to ensure a suitable orientation between the induction heating device 150 and the heating tip 152 for the heating result required for the particular application. For thermal isolation, the heating tip 152 is preferably at least partially surrounded by the gripping section 126 of the multipurpose melting appliance 110.

The heating tip 152 is preferably designed as a hollow nozzle 154 for the focused discharge of the material of the melting cartridge 130 that can be plasticized by means of the induction heating device 150 and the heating tip 152. The heating tip 152 may be formed of a metal material that can be directly induction heated to a predetermined maximum temperature by the induction heating device 150. Alternatively, the heating tip 152 can be heated indirectly via heating elements (170 in fig. 2) made of an inductively heatable metallic material, wherein at least one heating element is arranged locally on the heating tip 152 and is fixedly connected thereto for improved heat transfer. Furthermore, the heating tip 152 may be realized with a solid body formed of an inductively heatable material and may have, for example, a chisel-like, thorn-like or blade-like shape.

The multipurpose melting appliance 110 can thus be used as a universal application appliance for applying very different meltable or plastifiable materials, such as plastics, hot melt adhesives, waxes, low-melting metals or foodstuffs, to the workpiece 176. Other applications are for example the manufacture of 3D filaments comprising Polylactide (PLA), which is composed of a number of lactic acid molecules chemically bonded to each other, or the manufacture of such 3D filaments from Acrylonitrile Butadiene Styrene (ABS). Melting cartridges consisting of, for example, natural wax, sealing wax, synthetic wax, hard wax, colored wax or lipstick can likewise be handled by means of the multipurpose melting appliance 110. Furthermore, it is possible to provide the coating with a powder lacquer and a plastic coating in the form of granules and/or in the form of a stick. Furthermore, a melting cartridge composed of a food product is disposable. Here, a melting cartridge having chocolate, gelatin, cheese, sugar, caramel, frosting, sauce, spices, flavoring, and nut flour may be placed into the multi-purpose melting appliance 110. In addition, melting barrels made of metals, such as tin or other low melting point metal alloys, may be processed so that the multipurpose melting tool 110 may also be used like a conventional brazing tool. In the case of heating tips 152 of multipurpose melting appliance 110 which are not embodied as hollow nozzles 154 but as inductively heatable solid bodies, entirely new fields of application are opened up, for example (soft) soldering, hot cutting of thermoplastics, burning decorations on wood or plastics, etc. The heating tip 152 can be heated essentially only to a predefined maximum temperature.

If the base station 104 has more than one receiving well 106 and the multipurpose melting appliance 110 is received therein, the heating tips 152 can each reach different predefined maximum temperatures, so that a user can handle melting cartridges with different materials or raw materials (each having a different melting or plasticizing temperature) in a simple and comfortable manner with the aid of the apparatus 100 and the plurality of multipurpose melting appliances.

FIG. 2 shows the multipurpose melting appliance 110 of FIG. 1 and illustrates its construction. A melting cartridge, which is not shown in fig. 2, can preferably be fed by the user by means of a feeding device 190 having an actuating element 192 in the direction of the heating tip 152 embodied as a nozzle 154 and can thus be melted or plasticized on the front side. For this purpose, the feed device 190 preferably has a cutting jaw 200, which is slightly pressed or snapped into the melting cylinder at the surface and, in the non-actuated state of the actuating element 192, fixes the melting cylinder in position in the once-reached axial position. The nozzle 154 is preferably surrounded radially on the outside by a heating element 170, which can be heated by means of an induction heating device 150 (not shown here) within the base station (see fig. 1, reference numeral 150) up to a predefined maximum temperature.

The heating element 170 may be formed from a ferromagnetic alloy having a defined curie temperature preferably between 75 ℃ and 750 ℃. Therefore, the heating tip 152 preferably cannot be heated beyond the Curie temperature predetermined by the manufacturer, since the material loses its magnetic properties at higher temperatures. Due to this autonomous temperature regulation feature of the heating tip 152 or the nozzle 154, electronic control and/or regulation of the induction heating unit 150 within the base station may be omitted. By providing a plurality of multipurpose melting appliances in accordance with the type of multipurpose melting appliance 110, the heating tips 152 of which are each formed from a ferromagnetic alloy having a different curie temperature, it is possible to easily and comfortably handle melting cartridges composed of different materials or ingredients simultaneously by a user using the same apparatus (see fig. 1, reference numeral 100).

Alternatively, the heating tip 152 of the multipurpose melting appliance 110 may be entirely composed of a ferromagnetic alloy, thereby resulting in a structurally simplified construction. Further, the heating tip 152 may be constructed of stainless steel, stainless steel alloys, other metals, or other metal alloys that are preferably food grade without a defined curie temperature. In such a situation, it may be desirable to electronically control and/or adjust the induction heating unit 150 of at least one receiving well of the base station according to a pre-given maximum temperature of the heating tip 152. Such adjustment mechanisms are familiar to those skilled in the art of electrical heating appliances, such as hot melt glue pens or multi-purpose melting appliances, so that further technical explanations can be omitted within the scope of this description.

FIG. 3 shows a heating tip 152 of the multipurpose melting appliance 110 of FIG. 1, embodied as a nozzle 154, for example. In the region of the gripping section 126, the nozzle body 156 and the sealing element 132 preferably engage one another in an axial direction, preferably in a butt joint. According to one embodiment, the nozzle body 156 includes a cylindrical section 160 to which a conical section 162 axially engages, which in turn axially transitions into a hollow cylindrical tubule 164 of reduced diameter. The cylindrical section 160 and/or the conical section 162 preferably form a nozzle chamber 158 in which the material of the melting barrel is first plasticized. The thin tube 164 has a cylindrical nozzle channel 166 with a discharge opening 168 for the melted material of the melting barrel. The nozzle 154 of the heating tip 152 is shown at least partially coaxially surrounded by the heating element 170.

Fig. 4 illustrates the nozzle 154 of fig. 3 constructed in accordance with another embodiment 250. The nozzle 250, with the exception of the narrow tube 164, is preferably surrounded almost completely on the circumferential side by a heating element 264, preferably in the form of a hollow truncated cone and a hollow cylinder. This may result in as high a heat transfer as possible between the inductively heated heating element 264 and the nozzle 250.

Fig. 5 shows the nozzle 250 of fig. 4 with a heating element 274 according to another embodiment. The heating element 274, which is preferably a hollow truncated cone, preferably completely surrounds the conical section 162 of the nozzle 250, so that the heat transfer between the heating element 274 and the nozzle 250 takes place mainly in the most relevant region.

Fig. 6 shows the nozzle 250 of fig. 4 with an alternative heating element 284. According to another embodiment, the heating element 284, which is preferably hollow-cylindrical, comprises only the cylindrical section 160 of the nozzle 250, thereby resulting in a simplified and cost-effective manufacture of the heating element 284.

Fig. 7 shows the nozzle 250 of fig. 4 with preferably two approximately equally sized, approximately strip-shaped or half-shell shaped heating elements 294, 296. The two half-shell heating elements 294, 296 are preferably arranged uniformly spaced apart from one another on the circumferential side on the cylindrical section 162 and are preferably fixedly connected thereto. Two narrow longitudinal gaps 298 extend between the heating elements 294, 296, wherein only the front longitudinal gap 298 is visible here. These longitudinal gaps 298 here preferably extend parallel to the longitudinal center axis 140 and are positioned approximately diagonally relative to one another on the circumferential side.

In contrast to the illustration in fig. 7 with two approximately half-shell-shaped heating elements 294, 296, three or more heating elements can also be provided without a corresponding number of longitudinal gaps 298. The longitudinal gap 298 may also have a circumferential width of approximately zero, so that the heating elements directly abut against one another or abut against one another on the circumferential side. Furthermore, the heating element can also be configured in a C-shape. The heating elements 264, 274, 284, 294, 296 are preferably formed using the ferromagnetic alloys described above with a defined curie temperature, but may alternatively be formed using a metal or metal alloy that can be heated to a predetermined maximum temperature by means of the induction heating device 150.

FIG. 8 illustrates another embodiment of a nozzle 306 of a portable multi-purpose melting appliance 300 that can be used in place of the nozzle 154 in the multi-purpose melting appliance 110 of FIG. 1. The nozzle 306 preferably has a ball valve 320, wherein the ball valve 320 is shown in a closed state in fig. 8. The nozzle 306 preferably includes a heating element 274 of fig. 5 configured for indirect heating. According to an alternative embodiment, the nozzle 306 can be assigned an indirect or direct acting resistance heating device.

The grip section 126 of the preferably pen-shaped housing 120 of the multipurpose melting appliance 300 is preferably engaged with the nozzle 306 by means of the sealing element 132. The nozzle 306 particularly preferably comprises a conical section 310 with a discharge opening 312, which, in cooperation with a ball 314 and a frustoconical pressure spring 316, forms a ball valve 320. A cylindrical section 322 is joined to the conical section 310 of the nozzle 306. The sleeve 324, which is coaxially comprised by the cylindrical section 322 of the nozzle 306, preferably likewise has a cylindrical section 326 and a radially outwardly directed, circumferential collar 328 or flange-like projection. The cylindrical section 322 of the nozzle 306 is preferably non-releasably fixed to the cylindrical section 326 of the sleeve 324, for example by means of a press fit, by heat shrinking or the like, and the flange 328 of the sleeve 324 is fixedly connected to the grip section 126 of the pen-shaped housing 120. The ball 314 is preferably spring-loaded axially in the direction of the outlet opening 312 of the nozzle 306 by means of a frustoconical pressure spring 316. Pressure spring 316 is supported between ball 314 and an end 330 of cylindrical section 326 of sleeve 324.

In the closed state of the ball valve 320 shown in fig. 8, the material melted by the heating element 274, which preferably does not melt the cartridge 130, can be discharged from the discharge opening 312 of the nozzle 306, which is closed in a sealing manner by the ball 314. Alternatively, ball 314 may be supported directly on seal 132, such that sleeve 324 may be omitted.

Fig. 9 shows the ball valve 320 of fig. 8 in an open state. Here, the ball 314 is moved axially against the force of the pressure spring 316 in the direction of the gripping section 126 of the housing 120, so that the outlet opening 312 of the conical section 310 of the nozzle 306 is released over a predetermined circumference while achieving a narrow annular gap 336. Through the annular gap 336, the material of the melting cartridge 130 melted or plasticized by means of the heating element 274 (as indicated by the flow line 338) can be discharged in the direction of the workpiece, not shown here. Axial movement of ball 314 in the direction of gripping section 126 is accomplished by mechanical contact of ball 314 with the surface of the workpiece.

In the open state of the ball valve 320 of fig. 9, it is preferred that a substantial part of the effective opening cross section of the discharge opening 312 (with the exception of the annular gap 336) remains closed. The pressure spring 316, which tapers conically in the direction of the outlet opening 312, ensures that the ball 314 and the pressure spring 316 are reliably guided in the conical section 310 of the nozzle 306. At the same time, the pressure spring 316 matches the internal geometry of the nozzle 306, at least to a large extent. The ratio of the diameter of the outlet opening 312, which is not illustrated for a better graphical overview, to the ball diameter D is preferably between 0.5 and 0.95. In the case where the molten material of the melt cartridge 130 is hot melt adhesive, the ball diameter D is preferably about 3mm so that the hot melt adhesive can be reliably delivered through the ball valve 320 regardless of its high viscosity. For other materials that may be melted or plasticized by means of nozzle 306, such as plastics, waxes, low melting point metals, metal alloys or food products, the diameter D of ball 314 is preferably greater than 1.0 mm. If desired, ball 314 may also be formed of an inductively heatable metal or ferromagnetic alloy having a defined Curie temperature, thereby supporting the expulsion of the molten material of melting barrel 130. Alternatively, ball 314 may also be formed from stainless steel, preferably food grade, or from a stainless steel alloy.

The coating result by means of the multipurpose melting appliance 300 can be further improved on the basis of the ball valve 320. The molten material of the melting barrel 130 is reliably prevented from dripping from the nozzle 306 of the multipurpose melting appliance 300. In addition, the ball 314, which is rotatably received within the nozzle 306, facilitates guiding the nozzle 306 along the surface of the workpiece due to the reduction in rolling resistance. In addition, automatic feeding of the melting barrels 130 can be achieved by the ball valve 320 being automatically opened.

FIG. 10 illustrates another embodiment of a portable multi-purpose melting appliance 350 having a nozzle 154 and a modified heating element 370, preferably coaxially surrounding the nozzle 154, which is preferably capable of use with the apparatus 100 of FIG. 1 and is configured similarly to the multi-purpose melting appliance 110 of FIG. 1. The nozzle 154 with the outlet opening 168 can be heated to a predefined maximum temperature by means of a heating element 370, which can be heated by the induction heating 150 of the base station 104, for reliably melting or plasticizing the material of the melting cylinder. The selection of the material for the heating element 370 and the nozzle 154 is carried out analogously to the criteria described above in the context of the description of fig. 1 to 9 on the basis of the already mentioned inductively heatable starting materials or materials and material combinations for the nozzle and the heating element.

The nozzle 154 is shown with a cylindrical section 160 of larger diameter to which a cylindrical section 374 of smaller diameter and a conical section 162 engage in the direction of the discharge opening 168. As illustrated, the shoulder 378 extends in the circumferential direction between the larger diameter cylindrical section 160 and the smaller diameter cylindrical section 374, and the metal ring 380 is axially secured in a press-fit manner on the smaller diameter cylindrical section 374 in axially spaced relation from the shoulder 378. An optional sealing element 132 may be disposed between gripping section 126 of housing 120 and cylindrical section 160 of nozzle 154.

Spring element 384 embodied as a disk spring or spring element 386 embodied as a cylindrical spring is axially clamped in the axial direction between shoulder 378 and metal ring 380. The nozzle 154 and the metal ring 380 are preferably formed from the same ferromagnetic metal alloy (e.g., inductively heatable) with a suitable curie temperature, so that the press fit between the nozzle 154 and the metal ring 380 is always maintained regardless of the predefined maximum temperature of the nozzle 154. The

spring elements

384, 386 can compensate for manufacturing tolerances and always ensure a defined axial position of the heating element 370 on the smaller-diameter cylindrical section 374 of the nozzle 154 (even if the heating element 370 is at least partially lifted off from the smaller-diameter cylindrical section 374 of the nozzle 154).

In the production of the multipurpose melting appliance 350, by axially displacing the metal ring 380 over the smaller-diameter cylindrical section 374 of the nozzle 154 by the adjustment distance z before fixing the metal ring 380 to the nozzle 154, a correspondingly desired axial orientation of the heating element 370 relative to the center plane 142 of the induction heating device 150 can be achieved, and thus as a result a precise calibration of the maximum temperature of the nozzle 154 to be predefined can be achieved. Furthermore, compensation of manufacturing tolerances of the heating element 370 can be achieved. Furthermore, possible thermal stresses between the heating element 370, the shoulder 378, the press-fit fixed metal ring 380 and the smaller-diameter cylindrical section 374 of the nozzle 154 can be compensated for by the

spring elements

384, 386.

During the calibration process, the current temperature of the nozzle 154 is detected with or without contact by means of a thermometer when the induction heating device 150 is switched on, and the axial adjustment distance z is adapted accordingly. By introducing the nozzle 154 into the receiving well 106 of the base station 104, a calibration process of the multipurpose melting appliance 350 at a predetermined maximum temperature is achieved without the pen-shaped housing 120, which therefore simultaneously functions as a manufacturing aid. Thus, instead of the stop 108, for example, the upper surface 388 of the base station 104 serves to determine a defined axial position of the nozzle 154 relative to the induction heating device 150 of the receiving well 106 of the base station 104. Instead of the base station 104, a specially designed manufacturing aid can also be used for the calibration process of the nozzle 154 of the multipurpose melting device 350 to a predetermined temperature.

Fig. 11 shows an alternative embodiment of the heating element 370 of fig. 10. The heating element 370, which is preferably approximately hollow-cylindrical, has a recess 392 which, in the installed state, points away from the nozzle 154. The recess 392 preferably has three

recesses

398, 400, 402, which are arranged at a uniform distance from one another on the circumferential side and are each embodied substantially rectangular in this case. The axial height H of the

recesses

398, 400, 402 preferably corresponds to approximately half the axial height of the overall height H of the heating element 370. The three

recesses

398, 400, 402 here by way of example ensure that the heating action of the induction heating device 150 is substantially concentrated in the hollow cylindrical section 424 of the heating element 370, which is free of recesses and is located near the nozzle. Furthermore, the calibration process for a predetermined maximum temperature of the heating element 370 is simplified, since the cut-out 392 does not contribute any significant to the heating of the heating element 370. Thus, a larger axial adjustment distance (see fig. 10) firstly produces a relevant change in the predefined maximum temperature, which overall increases the accuracy of the calibration process. In contrast to the three

recesses

398, 400, 402, which are shown here only by way of example, two or more than three recesses can also be provided in the heating element 370.

Fig. 12 shows a further embodiment 410 of a heating element 370 for the nozzle 154 of fig. 10, which likewise has three

recesses

418, 420, 422 introduced in the recess section 414 at circumferential sides, spaced apart from one another uniformly. The hollow section 414 of the heating element 410 is directed away from the nozzle 154 in the fitted state on the nozzle 154. In contrast to the heating element 370 of fig. 10, the heating element 410 or the

cutouts

418, 420, 422 in this case have only an approximately triangular or trapezoidal shape, respectively. The heating element 410 may be formed from a ferromagnetic alloy having a defined curie temperature. Alternatively, the heating element 410 may be formed from any inductively heatable metal, metal alloy, preferably food grade stainless steel or stainless steel alloy. Furthermore, the heating element 410 may also be configured as an ohmic resistance heating element. The same applies to all heating elements according to fig. 1 to 11.

FIG. 13 illustrates another embodiment of a portable multi-purpose melting appliance 450, the multi-purpose melting appliance 450 being configured similarly to the multi-purpose melting appliance 110 of FIG. 1, however with an alternative feeding device 474 that may be used in place of the feeding device 190 of FIG. 1. In the region of the gripping section 126, a feed device 474, preferably for melting cartridges, is advantageously positioned ergonomically, by means of which the melting cartridges can be fed or conveyed in a controlled manner by the user in the direction of the nozzle 154. For this purpose, the advancing device 474 preferably has a rocker-type or push-button-type actuating element 480, which interacts with a spring element 482, which is only shown in dashed outline here.

Fig. 14 shows the multipurpose melting appliance 450 of fig. 13, wherein the melting cartridge 130 of fig. 1 is preferably loaded axially in the direction of the nozzle 154 by means of a pressure spring 470, as indicated by arrow 472. The rocker-operating element 480 of the feed device 474 is spring-elastically attached to the housing 120 by means of a spring element 482, substantially centrally as shown. The spring element 482 of the actuating element 480, which spring element is formed in the form of a housing web, is preferably integrally formed with the housing 120. An actuating surface 484 for the user is integrally formed, for example, on the end of the rocker-type actuating element 480 facing the nozzle 154, and a radially inwardly directed cutting clamp 486 having a wedge-shaped cross-sectional geometry is integrally formed, for example, on the end of the actuating element 480 facing away from said actuating surface.

In the non-actuated state of the actuating element 480, the cutting jaw 486 is preferably spring-loaded in the direction of the rotation arrow 490 due to the torsion spring action of the spring element 482 and bites into the melting barrel 130 at the surface. Therefore, the melting barrel 130 is reliably fixed in axial position. By pressing the actuating surface 484 of the actuating element 480 on the user side, the melting cartridge 130 is preferably released by the cutting clamp 486 and is fed or conveyed further axially in the direction of the nozzle 154 due to the force of the compression spring 470.

Fig. 15 shows the multipurpose melting appliance 450 of fig. 13 with a feed device 500 according to another embodiment, which can likewise be used instead of the feed device 190 of fig. 1. In contrast to the embodiment of fig. 14, the feed device 500 has two actuating elements 506, 508, which are embodied in the form of double-sided levers and are mounted on the housing 120 in the region of the gripping section 126 so as to be tiltable and opposite one another. In the interior 124 of the supply section 122, a melting cartridge 130, which can be axially preloaded in the direction of the nozzle 154 (as indicated by arrow 472), by means of a pressure spring, not shown here, is preferably received in an axially feedable manner. At the ends of the actuating elements 506, 508, which are not illustrated for a better overview of the drawing, wedge-shaped cutting jaws 510, 512 are preferably formed in each case. The first actuating element 506 is shown by means of a first spring element 514 and the second actuating element 508 is biased radially outward by means of a second spring element 516, so that the cutting jaws 510, 512 are slightly pressed or snapped into the melting cylinder at the surface in the respectively non-actuated state of the actuating elements 506, 508. The melting barrel 130 is thus axially fixed in position in such a way that it is not axially preloaded in the direction of the nozzle 154.

By the user pressing the two lever-type actuating elements 506, 508 radially inward in the direction of the arrow 518, the cutting jaws 510, 512 and the melting cartridge 130 are disengaged, so that the melting cartridge 130 can be fed autonomously in the direction of the nozzle 154 of the multipurpose melting appliance 450. After the two actuating elements 506, 508 have been released on the user side, the two cutting jaws 510, 512 are again slightly embedded in the melting cylinder 130 at the surface, so that the melting cylinder is again fixed in position in the current axial position and no further material or further starting material is melted and can be discharged.

FIG. 16 shows the multipurpose melting appliance 450 of FIG. 13 with an alternative feeding device 550 that can be used in place of the feeding device 190 of FIG. 1. The axially displaceable melting cartridge 130 is again axially preloaded in the direction of the nozzle 154 or in the direction of the arrow 472. The actuating element 552 of the feed device 550, which is in this case of the push-button type, is preferably realized by a toggle lever 554, which is received in a supporting point 556 in the housing 120 of the multipurpose melting appliance 450 so as to be tiltable to a predetermined extent. The end of the knee lever 554, which is not illustrated for a better overview of the drawing, has a cutting clamp 558 with an approximately wedge-shaped geometry. At the end of the knee lever 554 pointing away from this, a U-shaped spring element 562, which is embodied in one piece with the knee lever 554 and is supported against the housing 120, is preferably formed. By means of the spring element 562, the crankshaft 554 not actuated by the user is preferably pretensioned radially inward in a springing manner about the longitudinal center axis 140, so that the cutting clamp 558 is slightly pressed or cut into the melting barrel 130 at the surface and is axially fixed in position.

If the actuating element 552 is pressed radially inward by the user against the force of the U-shaped spring element 562, the cutting clamp 558 releases the melting cartridge 130 so that it can be fed axially in the direction of the nozzle 154 by the force of the compression spring. By releasing the actuating element 552 on the user side, the cutting clamp 558 is pressed again into the melting cylinder 130 at the surface by the force of the spring element 562, so that its axial feed is reliably stopped and no further material is melted or plasticized by means of the nozzle 154.

Fig. 17 shows the multipurpose melting appliance 450 of fig. 13 with a further alternative feed device 600, which can be used instead of the feed device 190 of fig. 1, wherein the melting barrels 130 are axially preloaded in the direction of the nozzles 154 or the arrow 472. The frame-like actuating element 602 of the feed device 600 preferably has an upper web 604, a lower web 606 running parallel and spaced apart therefrom, and two side webs 608, 610 running parallel and spaced apart, which preferably engage one another at approximately right angles on the circumferential side and thus enclose an opening 612, which is only illustratively square-shaped, through which the melting cartridge 130 is guided.

The actuating element 602 is preferably loaded radially outward with respect to the central longitudinal axis 140 of the multipurpose melting appliance 450 by means of a spring element 618, which is embodied, for example, in the form of a cylindrical compression spring. The spring element 618 is preferably supported between the lower tab 606 of the multipurpose melting appliance 450 and the housing 120. Upper tab 604 preferably forms a control surface 614 for the user. Integrally formed on the lower web 606 is a cutting clamp 620 which is directed in the direction of the melting cartridge 130 and which is embodied in the form of teeth 622 or grooves.

In the non-actuated state of the operating element 602 of the feed device 600 of fig. 17, the cutting and clamping element 620 slightly bites into the melt barrel 130 at the surface or slightly so that the melt barrel is axially fixed in position. By pressing the actuating element 602 on the user side, the cutting gripper 620 releases the melting cartridge 130, so that it can be advanced further in the direction of the nozzle 154 due to the force of the rear pressure spring 618. In the event of a renewed release of the operating element 602 by the user, the spring element 618 presses the operating element 602 and thus in turn presses the cutting clamp 620 formed by the lower tab 606 radially inward in the direction of the melting cartridge 130. In this case, the cutting clamp 620 is pressed slightly into the advancing melting barrel 130 again at the surface, which is thus reliably axially fixed.

FIG. 18 shows another embodiment of a portable multipurpose melting appliance 650, the portable multipurpose melting appliance 650 being constructed similarly to the multipurpose melting appliance 110 of FIG. 1, but being provided differently therefrom with another embodiment of a feed device 670 which may be used in place of the feed device 190 of FIG. 1. In the region of the feed section 122, a feed device 670, which preferably acts according to the so-called "pinch feed principle", is provided for the user, having an operating element 672 of the slider type. The actuating element 672 with the illustrated concave or rounded actuating surface 674 for the user preferably has on the underside a cutting clamp 678 oriented radially inward or in the direction of the melting cartridge 130, which is realized by means of an arrangement of teeth 680 or undercut grooves on the underside. The actuating element 672, which is designed to be slightly sprung in the radial direction, is preferably received and guided in the housing 120 so as to be displaceable parallel to the longitudinal center axis 140 by means of a guide 682.

By axially advancing the operating element 672 in the direction of the nozzle 154 on the user side, wherein the operating force F acts slightly obliquely on the operating element 672, the operating element is advanced in the axial direction and at the same time is pressed slightly radially inwards. This causes the teeth 680 of the cutting clamp 678 to bite into the melting barrel 130 at the surface, so that it can be fed by means of the actuating element 672, which is moved in the direction of the nozzle 154, a short distance in the direction of the nozzle 154 for melting on the front side. The melt cartridge 130 can be introduced into the interior 124 of the supply section 122 through a rear opening 690 of the end section 128 of the pen-shaped housing 120.

A not shown tension spring may be provided in order to return the slider-like operating element 672 autonomously to the initial position shown in fig. 18 after feeding by the user. The actuating element 672 is preferably sprung radially outward with respect to the longitudinal center axis 140 due to its inherent elasticity in the non-actuated state, so that the teeth 680 of the cutting clamp 678 and the melting cartridge 130 are disengaged when the actuating element 672 is slid back, with the melting cartridge 130 remaining in the axial position reached. In the normal operating position of the multipurpose melting tool 650, the longitudinal central axis 140 is inclined at an angle of more than 30 ° to the horizontal, so that the own weight of the melting cartridge 130 contributes to maintaining the axial position reached once and in contact with the front side of the nozzle 154. Unlike the embodiment of the feeding device of fig. 13 to 17, a pressure spring for axially feeding the melting barrels is preferably not provided.

Fig. 19 shows the multipurpose melting device 650 of fig. 18 with an alternative feed device 700, which can be used instead of the feed device 190 of fig. 1, and which has an operating element 702 which operates according to the so-called "pump principle". The toggle lever 704 of the actuating element 702 preferably comprises a first and a

second leg

706, 708, which are connected at a hinge point 710, wherein a semi-cylindrical actuating body 712 for a user is preferably arranged in the hinge point 710. Preferably, the cutting clamp 718 or clamp block is hinged to the unmarked end of the first edge 706. The clamp member 718 is axially movable within the housing 120 in a longitudinal guide 722 (e.g., an elongated hole, etc.). The end of the second side 708 not labeled is preferably pivotably hinged to the housing 120 at a pivot point 724. The cutting clamp 718 preferably has a wedge-shaped or serrated projection 726, which is directed radially inward or downward with respect to the longitudinal center axis 140 and has a cutting edge 728 and a front face 730 as well as a slip-promoting bevel 732. In this case, the slip-promoting ramp 732 is preferably inclined such that it only opposes the axial movement of the cutting clamp 718 in the direction of the end section 128 along the melting barrel 130 or the movement of the melting barrel 130 relative to the cutting clamp 718 in the feed direction 734 with relatively little mechanical resistance. The front surface 730 of the wedge-shaped protrusion 726 is preferably substantially perpendicular to the longitudinal mid-axis 140 and directed in the direction of the nozzle 154. Furthermore, the cutting clamp 718 is preferably loaded by means of a spring element 736 in the direction of the end section 128 of the housing 120.

By pressing the actuating body 712 of the toggle lever 704 of the actuating element 702, the cutting jaws 718 are first moved slightly radially inward against the force action of the spring elements 736 and are then moved in the direction of the nozzle 154. In this case, the wedge-shaped projection 726 bites with the cutting edge 728 and the associated front surface 730 into the melt barrel 130 at the surface and feeds it axially in the direction of the nozzle 154. Due to the perpendicular front face 730, the wedge-shaped projection 726 of the cutting clamp 718 reliably feeds the melt cartridge 130 in the direction of the nozzle 154.

If the user releases actuating body 712 of actuating element 702 again, cutting jaw 718 is moved back in the direction of end section 128 of housing 120 as a result of the force action of spring element 736, wedge-shaped projection 726 being lifted out of melting cartridge 130 by means of slip-assist ramp 732, so that the melting cartridge is held in the occupied axial feed position. In the case of this further embodiment of the feed device 700, it is also generally not necessary to load the melting cartridge 130 on the rear side by means of a compression spring or the like.

FIG. 20 shows the multipurpose melting appliance 650 of FIG. 18 having another embodiment of a feeding device 750 that may be used in place of the feeding device 190 of FIG. 1. The multipurpose melting device 650 has an end section 128 which, in contrast to fig. 18 and 19, is provided with a releasable rear closing element 754. As a further difference from fig. 18 and 19, the melting cartridge 130 is axially prestressed in the direction of the nozzle 154 by means of a rear pressure spring 756, the pressure spring 756 being supported between the melting cartridge 130 and the closing element 754.

The feed device 750 operates according to the so-called "brake principle" and furthermore preferably comprises a brake device 760 which can be actuated by a user by means of an actuating element 752. The braking device 760 preferably has a pot-shaped braking element 762 which is received in the housing 120 so as to be displaceable transversely and which is prestressed radially inward against the melting cartridge 130 by means of a spring element 764 embodied as a cylindrical compression spring. As a result, the melt cartridge 130 is loaded radially outward against the inner wall 770 of the interior space 124, whereby the melt cartridge 130 is axially fixed in position against the force of the back-side pressure spring 756. The resulting inclination of the melting cylinder 130 with respect to the longitudinal center axis 140 is shown exaggerated here.

By actuating the actuating element 752 on the user side (this is achieved, for example, by tilting the actuating element 752 about the pivot axis 772, by axial displacement, etc.), the radially inwardly directed pretension of the pot-shaped braking element 762 is cancelled, or the braking element 762 is lifted slightly from the inner wall 770 and the brake 760 is released. The frictional lock between the melt cylinder 130 and the inner wall 770 is removed so that the melt cylinder 130 can be fed into the nozzle 154 for melting due to the force of the pressure spring 756. The axial feed of the melting cartridge 130 is stopped again by activating the brake 760 again on the user side.

FIG. 21 shows the multipurpose melting appliance 650 of FIG. 18 with another embodiment of a feeding device 800 that can be used in place of the feeding device 190 of FIG. 1. The feeding device 800 for the multipurpose melting appliance 650 is preferably based on the so-called "spray principle". The operating element 802 of the feeding device 800 is hereby embodied as a preferably integral plunger 804, which comprises a piston 806, which is cylindrical only by way of example, and an end-side mushroom-shaped actuating button 808 for a user. The piston 806 can preferably be introduced axially into the interior 124 of the housing 120 through the rear-side opening 810 until the axial position of the piston 806 from fig. 21 is reached and its piston end face 812 abuts at least partially against the melting cartridge 130.

By pushing piston 806 further into interior space 124 of housing 120, the user can feed melting barrel 130 through cylindrical interior space 124 in the direction of nozzle 154 for continuously melting the material of melting barrel 130 on the front side as desired. To ensure the necessary sealing action and a shock-free, slight axial displaceability, at most a slight press fit exists between the inner wall 814 of the interior space 124 of the housing 120 of the multipurpose melting appliance 650 and the piston 802.

FIG. 22 illustrates another embodiment of a portable multi-purpose melting appliance 850, which is configured similar to the multi-purpose melting appliance 110 of FIG. 1, having another embodiment of a feed device 870, which can be used in place of the feed device 190 of FIG. 1. In the region of the supply section 122, a feed device 870 having an operating element 872, which acts according to the so-called "valve principle", is preferably provided, which enables automatic feeding of the melting barrels 130. The operating element 872 preferably has a slightly convex foil-like control surface 874 for the user. Furthermore, a rear opening 880 for introducing a melting cartridge 130 is preferably provided in the end 128 of the housing 120. As illustrated, part a is labeled in the area of the nozzle 154 and part B is labeled in the area of the supply section 122.

Fig. 23 shows detail a of fig. 22, wherein the feed device 870 comprises a valve unit 884 as a structural component of the inductively heatable nozzle 154 in the region of the gripping section 126 of the housing 120 of the multipurpose melting appliance 850, in particular as illustrated. The valve housing 886 of the valve unit 884 is preferably arranged axially between a focusing nozzle section 888 having a narrow tube 890 with an outlet opening 892 and a heating chamber 894 of approximately hollow cylindrical shape for melting or plasticizing the material of the melting cartridge 130.

Furthermore, the valve housing 886 preferably has an inlet channel 898 for the inflow of the material melted or plasticized in the heating chamber 894 of the melting cartridge 130, and an outlet channel 900 which opens into the nozzle section 888 of the nozzle 154 for discharging the plasticized material of the melting cartridge 130. Preferably, transversely to the longitudinal center axis 140, a substantially cylindrical valve body 906, which has an annular groove 908 running on the peripheral side, is received in a cylindrical bore 910 of the valve housing 886 so as to be displaceable transversely to the longitudinal center axis 140. The valve body 906 is loaded radially outward with respect to the longitudinal center axis 140 by means of a spring element 912, which is preferably realized by means of a compression spring. The valve body 906 preferably forms a radially outwardly directed tappet 914 which is loaded radially outward by the force action of the spring element 912 and forms a control surface 874 of the actuating element 872.

In the condition of fig. 23, valve unit 884 is closed because cylindrical valve body 906 interrupts the connection between input passage 898 and output passage 900 such that plasticized material of melt cartridge 130 cannot be discharged from heating chamber 894 into nozzle section 888. By pressing the actuating surface 874 of the actuating element 872 in the direction of the arrow 916 on the user side, the valve body 906 is moved against the force action of the spring element 912 until the inlet channel 898 and the outlet channel 900 coincide with the annular groove 908 and the material of the melting cartridge 130 melted in the heating chamber 894 can flow via the nozzle section 888 into the narrow tube 890 with the outlet opening 892. To open the valve unit 884, the valve body 906 is preferably pushed radially in by means of a tappet 914 which is actuated in its turn by a film-like elastic actuating surface 874 as an actuating element 872. If the user releases the operating element 872 again, the valve body 906 moves radially outwards autonomously by the force of the spring element 912 until the valve unit 884 reaches the closed position shown in fig. 23 again.

Fig. 24 shows a part B of fig. 22. In the region of the end section 128, the housing 120 preferably has an approximately hollow-cylindrical outer sleeve 922 which can be rotated by the user, for example in the direction of the rotational arrow 920, about the longitudinal center axis 140, coaxially surrounds the inner sleeve 924 as shown and is temporarily connected thereto in a rotationally fixed manner. Preferably, an internal thread 930 is formed on the inner sleeve 924, which internal thread interacts with a feed slide 932, which can preferably be prestressed axially in the direction of the supply section 122 or of a nozzle not shown here by means of a pressure spring 934, which is preferably implemented according to the type of cylindrical spring. The compression spring 934 is preferably supported between the feed slide 932 and a built-in shoulder 936, only indicated in the figure, of an inner wall 938 of the interior space 124 of the end section 128 of the pen-shaped housing 120. The axially freely movable tensioning jaw 944, which is preferably at least sectionally receivable in the feed slide 932, preferably has at least two radially inwardly directed and diagonally arranged tips 946, which can bite into the melting barrel 130. In particular, the internal threads 930, the feed slide 932, the compression spring 934, and the at least two tensioning clamps 944 having two tips 946 are additional structural components of the feed device 870 of the multi-purpose melting tool 850.

By twisting the outer sleeve 922 on the user side (which can be achieved, for example, only in the direction of the rotational arrow 920), the feed slide 932 is preferably moved axially within the interior space 124 by means of the internal thread 930 in the direction opposite to the feed direction 950 of the melting barrel 130. This rearward displacement of the feed slide 932 is preferably effected against the force of the compression spring 934. Once the pressure spring 934 is fully tensioned or the user releases the outer sleeve 922 again, the engagement of the feed slide 932 in the internal threads 930 of the inner sleeve 924 is again removed. The melting barrel 130 can be clamped by means of an axially freely movable tensioning clamp 944 which engages in sections into the feed slide 932. The feed slide 932 is loaded in the feed direction 950 by a pressure spring 934 acting against the feed slide 932. The tensioning clamp 944 is therefore pressed at least in sections into the feed slide 932, as a result of which the diameter of the tensioning clamp 944, which is not shown for a better graphical overview, is reduced by the subsequently formed form-locking connection with the feed slide 932, and the radially inwardly directed end 946 of the tensioning clamp 944 bites into the melting barrel 130 at the surface.

When sufficient molten material of the melt cartridge 130 flows out of the outlet opening 892 of the nozzle 154 by opening the valve unit 884, the melt cartridge 130 clamped to such an extent is fed together with the feed slide 932 loaded by the fully tensioned compression spring 934 in the discharge or feed direction 950, so that a corresponding axial pushing of the melt cartridge 130 is possible by the force action of the axially preloaded compression spring 934 of the feed device 870. As a result, the feed device 870 thus allows a fully automatic, as-needed feeding of the melting cartridge 130 (see in particular fig. 23,

reference numerals

154, 872, 884, 892) merely by actuating the operating element 872 of the valve unit 884 on the user side and by completely tensioning the pressure spring 934 beforehand by means of the rotatable outer sleeve 922.

Claims

1. A portable multipurpose melting appliance (110, 300, 350, 450, 650, 850) having at least one inductively heatable heating tip (152) for melting cartridges (130) of different meltable materials, characterized in that at least one heating element (170, 264, 274, 284, 294, 296, 370, 410) connected to the heating tip (152) and/or the heating tip (152) can be heated only to a predefined maximum temperature.

2. The portable multipurpose melting appliance according to claim 1, wherein at least one heating element (170, 264, 274, 284, 294, 296, 370, 410) connected to the heating tip (152) and/or the heating tip (152) has a ferromagnetic alloy assigned a defined curie temperature between about 75 ℃ and 750 ℃.

3. Portable multipurpose melting appliance according to claim 1 or 2, characterized in that a pen-shaped housing (120) is provided, having a supply section (122), an interior space (124) for receiving at least one melting cartridge (130) and a grip section (126) near the heating tip for gripping at the user side, wherein preferably the grip section (126) at least partially surrounds the heating tip (152) for thermal insulation.

4. The portable multi-melting apparatus of any one of the preceding claims, wherein the heating tip (152) is embodied as a nozzle (154, 250, 306) having a nozzle chamber (158) and a reduced diameter discharge opening (168) for melting the molten material of the cartridge (130).

5. The portable multipurpose melting appliance of claim 4, wherein the nozzle (154, 250, 306) is connected to at least one heating element (170, 264, 274, 284, 294, 296, 370, 410) that is approximately hollow cylindrical, hollow truncated conical, cylindrical shell, truncated conical shell and/or bar shaped.

6. A portable multipurpose melting appliance according to claim 4 or 5, wherein said nozzle (154, 306) has a self-closing and spring-loaded ball valve (320).

7. A portable multipurpose melting appliance according to any of the claims 4 to 6, characterized in that the heating element (370) of the nozzle (154) is arranged between a shoulder (378) of the nozzle (154) and a metal ring (380) which is fixedly connected, preferably pressed or heat shrunk, with the nozzle (154).

8. The portable multipurpose melting appliance according to claim 7, wherein the heating element (370) is spring biased axially in the direction of the outlet opening (168) of the nozzle (154) by means of a spring element (384, 386) supported between the shoulder (378) and the metal ring (380).

9. The portable multipurpose melting appliance according to claim 7 or 8, wherein the heating element (370) has a plurality of rectangular, trapezoidal or V-shaped and axially non-penetrating recesses (398, 400, 402, 418, 420, 422) which are preferably arranged at a uniform circumferential spacing from one another on a recess section (392) which points away from the outlet opening (168) of the nozzle (154).

10. A portable multipurpose melting appliance according to one of claims 6 to 9, characterized in that a feed device (190, 474, 500, 550, 600) is assigned to the melting cartridge (130), wherein the melting cartridge (130) is axially pretensioned in the direction of the nozzle (154, 250, 306) by means of a compression spring (470), and the feed device (190, 474, 500, 550, 600) has at least one operating element (192, 480, 506, 508, 552, 602, 672, 702) which is pretensioned radially outward in a springing manner and has an integrated cutting clamp (200, 486, 510, 512, 558, 620, 678).

11. The portable multipurpose melting appliance according to claim 10, characterized in that the melting cartridge (130) is held axially by means of an associated cutting clamp (200, 486, 510, 512, 558, 620, 678, 718) when at least one operating element (192, 480, 506, 508, 552, 602, 672, 702) is released on the user side.

12. Portable multipurpose melting appliance according to claim 10 or 11, characterized in that the melting cartridge (130) can be released by pressing the at least one operating element (192, 480, 506, 508, 552, 602) directed radially inwards on the user side and can be fed by means of the pressure spring (470) in the direction of the nozzle (154, 250, 306).

13. An apparatus (100) having at least one portable multipurpose melting appliance (110, 300, 350, 450, 650, 850) according to one of the preceding claims and having an external base station (104) with at least one receiving well (106) with an induction heating device (150), wherein in the at least one receiving well (106) at least one heating tip (152) of the at least one multipurpose melting appliance (110, 300, 350, 450, 650, 850) can be received at least partially for induction heating by means of the induction heating device (150).

14. The plant (100) according to claim 13, wherein the base station (104) has at least two receiving wells (106) for one portable multipurpose melting appliance (110, 300, 350, 450, 650, 850), respectively.

15. The apparatus (100) according to claim 14, characterised in that the receiving wells (106) of the base station (104) are each configured obliquely with respect to the perpendicular (180) to the base (182) at an angle (a) of preferably between 0 ° and 60 °.