Operating device for a hand-held tool

Abstract

The invention relates to an operating device for a hand-held tool, comprising: a housing unit (A11) having a housing main body (A12) and an accumulator casing (A13), the housing unit (A11) surrounding a substantially hermetically sealed, hollow interior (A18), and the accumulator casing (A13) at least partially delimiting the interior (A18); an operating element (A19) located on the housing unit (11) for actuating at least one operating function of the operating device (A10); and / or a display element (A28) located on the housing unit (A11) for transmitting information to the operator, wherein the accumulator casing (A13) has at least one predetermined breaking point (A20) for pressure equalization between the interior (A18) and the surroundings when there is excess pressure in the interior (A18) of the housing unit (A11).

Description

[0001] Operating device for a hand-held work tool

[0002] The invention relates to an operating device for a hand-held working device according to the preamble of claim 1.

[0003] Operating devices for a hand-held tool are known, comprising a housing unit with a housing base and a battery housing. The housing unit comprises a hollow interior that is essentially hermetically sealed. The interior is at least partially defined by the battery housing. A circuit board is provided in the housing, which is powered by a battery. The battery is arranged in the battery housing.

[0004] It is well known that excess pressures that arise in the battery casing when a battery emits gas must be compensated for. For this purpose, battery casings are designed in such a way that they rupture or burst when excess pressure develops.

[0005] The disadvantage of such operating devices is that it is likely to be difficult to open the battery casing in a targeted manner if the excess pressure is high enough. Furthermore, if the battery casing bursts open, splinters may form, which then fall into the housing of the tool.

[0006] It is therefore an object of the invention to provide an operating device for a hand-held working device of the generic type that enables reliable overpressure compensation at a targeted threshold value without damaging the rest of the working device.

[0007] This object is achieved by a hand-held tool according to the features of claim 1. The operating device according to the invention for a hand-held tool, in particular a portable and hand-held tool, comprises a housing unit with a housing base body and with a battery housing, wherein the housing unit comprises a substantially airtight, hollow interior, wherein the battery housing at least partially delimits the interior. Furthermore, the tool comprises an operating element arranged on the housing unit for actuating at least one operating function of the operating device and / or a display element arranged on the housing unit for transmitting information to the operator. The battery housing has at least one predetermined breaking point for pressure equalization between the interior and the environment in the event of overpressure in the interior of the housing unit.

[0008] The predetermined breaking point on the battery casing ensures that the battery casing breaks open at a predetermined location. This point on the battery casing can be designed in such a way that the battery casing breaks open at precisely this location at a predetermined overpressure. The targeted design of the predetermined breaking point allows the predetermined overpressure at which pressure equalization should occur to be defined very precisely. Furthermore, it prevents the battery casing from breaking open at a location other than the predetermined breaking point, thus preventing unwanted breakage or splintering.

[0009] The predetermined breaking point is designed in particular in such a way that pressure equalization occurs in particular at a pressure value between 10 bar and 30 bar, preferably between 15 bar and 25 bar, advantageously between 18 bar and 23 bar. Very particularly, pressure equalization occurs at a maximum of 20.7 bar, preferably at approximately 18 bar. In other words, the battery housing breaks open at the predetermined breaking point at the above-mentioned pressure values, so that the pressurized interior is fluidly connected to the outside environment and pressure equalization between the interior and the outside environment can occur. It is preferably provided that the battery housing has a housing wall, wherein the predetermined breaking point is formed by a partial thinning of the housing wall. The battery housing has a wall thickness at the partial thinning which is preferably at most 0.5 mm, in particular approximately 0.4 mm.Adjusting the wall thickness is one way to set a pressure value at which the battery casing breaks open at the predetermined breaking point and pressure equalization can occur.

[0010] The battery housing is particularly cup-shaped, with the predetermined breaking point being located at the bottom of the cup, particularly centrally. The wall thickness of the battery housing at the bottom of the cup adjacent to the partial thinning is preferably less than 1 mm, particularly preferably less than 0.8 mm, in particular approximately 0.7 mm.

[0011] It is advantageous for the predetermined breaking point to have a central region and several, in particular four, legs extending from the central region. The multiple legs divide the region in which the predetermined breaking point is formed into several segments. The central region and the legs form the partial thinning of the housing wall, whereby the battery housing breaks open at the central region and at the legs. The central arrangement of the predetermined breaking point, in particular of the central region on the housing base, ensures that the crack always occurs in the central region when the housing base is broken. From there, the crack extends further into the legs. Preferably, the multiple legs each extend from a proximal end at the central region to a free, distal end. The crack then migrates to the distal ends of the legs.Particularly preferably, the legs extend radially toward the central region. If the battery housing is broken open at the predetermined breaking point, a segment formed by two legs has two free edges. The free edges are formed by the broken legs of the predetermined breaking point. Furthermore, the segment has a foot that extends between two distal ends of adjacent legs. The foot connects the segment to the housing base of the battery housing. This prevents the segments from breaking completely off the housing base.

[0012] Particularly advantageous is the circular design of the distal end of the multiple legs. This reduces the stress concentration and thus the stress peaks at the distal end of the leg. This prevents unintentional tearing of the housing wall beyond the predetermined breaking point. The crack originating from the central area thus terminates at the circular distal ends of the multiple legs.

[0013] The predetermined breaking point is particularly cross-shaped. Thus, the predetermined breaking point divides an area of ​​the housing wall into four segments. A different number of segments may also be appropriate. The segments are preferably of equal size.

[0014] It is advantageously provided that the battery housing is cast with the housing body, wherein the battery housing has several, in particular four, feet cast in the casting compound. In addition to the housing base, in particular the pot base, the battery housing has a housing shell. The housing shell extends along a longitudinal center axis from a first end to a second end. The housing base is arranged at the first end of the housing shell. The plurality of feet are arranged at the second end of the housing shell. The plurality of feet of the battery housing extend radially to the longitudinal center axis of the battery housing, whereby the cast-over feet can absorb axial forces acting on the battery housing. Such axial forces act in the direction of the longitudinal center axis of the battery housing. This can prevent the battery housing from being pushed out of the casting compound, even at high internal pressures. A firm hold of the battery housing in the casting compound is thus ensured.

[0015] The housing unit is preferably made of plastic. Particularly preferably, the housing unit is made entirely of plastic. HMI (Human-Machine Interface) units for hand-held implements are also known from the prior art. These units comprise a housing unit with a housing base, an operating element arranged on the housing unit, and a receptacle for attaching the operating element to the housing base. The HMI unit is attached to a housing of the implement.

[0016] A disadvantage of such devices is often the large number of parts, which in turn leads to complex assembly of the HMI unit. Furthermore, connecting the HMI unit to the housing can also be complex.

[0017] The invention is therefore further based on the object of specifying an HMI unit for a hand-held working device of the generic type, which enables simple assembly of the HMI unit itself and simple connection to a housing of the working device.

[0018] This object is achieved by an HMI unit for a hand-held working device according to the features of claim 11.

[0019] The HMI unit according to the invention for a hand-held working device comprises a housing unit with a housing base body, a _, Control element for activating at least one control function of the HMI unit. The control element is held in place by a holder on the housing base. The holder is made of one of the _, type of elastic, first material that the operating element in a relative movement _,The housing base body is designed with at least one mounting stud for contact with the housing of the hand-held implement. The at least one mounting stud and the receptacle are made of the same, first material. The operating element, the receptacle, the housing base body, and the mounting stud are formed as a single piece. The following steps are required to manufacture the HMI unit for a hand-held implement:

[0020] - Casting of the housing base body,

[0021] - Casting the control element,

[0022] - Casting the receptacle and the at least one mounting stud with a first material.

[0023] The housing base body of the housing unit and the operating element are cast in a chronological sequence, particularly before the receptacle and the at least one mounting stud. The housing base body and the operating element are connected to each other by the subsequent casting of the receptacle. Thus, the housings are _,_,The housing base, operating element, and holder are formed as a single piece. The mounting stud, which is molded onto the housing base, is also formed as a single piece with the housing base, the operating element, and the holder. This design of the HMI unit reduces the number of separate parts. Consequently, the assembler only has to assemble a small number of individual components. This makes handling the HMI unit components much easier during assembly. In addition, the mounting stud serves as a contact point with the housing of the work tool. Since the mounting stud is made of an elastic material, it deforms upon contact with the housing, generating a preload force. This preload force, in turn, creates a clamping force between the mounting stud and the housing of the work tool.Since the control element holder and the at least one mounting stud are made of the same material, the holder and the mounting stud can be cast simultaneously. Particularly preferably, the mounting stud and the holder are directly connected to each other. A further advantage of the described one-piece design of the housing base, control element, and holder is that the HMI unit is well sealed against the ingress of water or other liquids. The electrical / electronic components in the HMI unit are protected.

[0024] In particular, it is provided that the housing base body is made of a second material and / or the operating element is made of a third material. The first material is in particular different from the second material and the third material. The first material is in particular more elastic than the second material and / or the third material. The material of the housing base body is significantly less elastic than the material for the mounting stud and the holder of the operating element. The material for the operating element is also significantly less elastic than the first material for the holder and the mounting stud. It can also be provided that the housing material for the housing base body and the third material for the operating element are identical.

[0025] In particular, at least two or more mounting studs are formed on the housing base. The two or more mounting studs are preferably formed on opposite sides of the housing base. Due to the mounting studs, a visible edge of the control element is spaced from the housing of the implement. This allows the manufacturing tolerances of the housing base to be _,body should be comparatively generously dimensioned. The distance between the housing base body and the housing allows for the compensation of inaccuracies in the manufacture of the housing base body with regard to the accuracy of fit. The mounting studs serve to fix the housing base body in the housing of the implement. The mounting studs are elastic and are pressed into the housing when the HMI unit is attached. The deformability of the mounting studs allows higher tolerances in the manufacture of the housing base body, which promotes easier production. In particular, it is provided that the housing base body has an outer side and an inner side, wherein the outer side faces the housing of the implement when the HMI unit is attached to the hand-held implement. The at least one mounting stud is formed in particular on the outer side of the housing base body.In particular, at least two or more mounting studs are formed on the outside of the housing base body.

[0026] Another disadvantage of known HMI units is that some of the controls are difficult to operate.

[0027] It is therefore a further object of the invention to provide an HMI unit which enables a simple actuation of a control element of the HMI unit.

[0028] This object is achieved by an HMI unit having the features according to claim 16.

[0029] The further independent invention is based on the finding that incorrect operation of a control element is often due to its tilting. If the control element tilts, the actuating element molded onto the control element often cannot be moved the required distance to touch a contact element in order to actuate an electrical or electronic circuit.

[0030] The HMI unit according to the invention for a hand-held working device comprises a housing unit with a housing base body, a _,An arranged operating element for actuating at least one operating function of the HMI unit, wherein the operating element extends from a first to a second end along a second longitudinal center axis over a length. The operating element is designed to be movable relative to the housing base body. The operating element has an upper side with an actuating surface for the operator and a lower side opposite the upper side. An actuating element with a second longitudinal center axis is arranged centrally on the lower side of the operating element. A contact element of the HMI unit can be actuated by means of the actuating element. The HMI unit has at least one first support element with a first support surface. The at least one first support element is designed to prevent tilting of the HMI unit.The maximum distance d between the first support surface of the at least one first support element and the first longitudinal center axis of the actuating element corresponds to at least 35%, preferably at least 40% of the length of the operating element. _, ele _, mentes.

[0031] If the operator presses the control element off-center, the section of the control element where the support element and the support surface are located will move. The support element contacts a corresponding counter-body, preferably the circuit board, with the support surface. The force then applied by the operator to the control element causes a lifting effect on the control element around the contact point of the support element's support surface. This leverage, in turn, causes the control element to move in its center, i.e., in the area of ​​the actuating element. Consequently, the actuating element of the control element is moved towards the contact element. The support element initiates movement of the actuating element even if the operator presses the control element off-center. This enables more convenient and easier operation of the HMI unit.

[0032] The HMI unit has at least one second support element with a second support surface, wherein the maximum distance between the first support surface and the second support surface corresponds to at least 70%, in particular at least 80%, of the length of the control element. The support elements are preferably arranged at the ends of the control element. The further apart the support elements are, the more robustly the control element reacts to off-center operation by the operator. This also ensures that the bearing points on the counter element, in particular the printed circuit board, are as far apart as possible, which also improves the leverage effect acting on the HMI unit.

[0033] In particular, it is provided that the at least one first support element and / or the at least one second support element are formed on the underside of the operating element and extend in the direction of the second longitudinal center axis of the actuating element and, in particular, project beyond the actuating element in the direction of the second longitudinal center axis of the actuating element. In an alternative embodiment, it could also be provided that the support elements are arranged on the printed circuit board.

[0034] In particular, it is provided that the HMI unit comprises at least one display element arranged on the housing unit for transmitting information to the operator. Such a display element is preferably designed as a display, in particular as a touch-sensitive display.

[0035] A printed circuit board is located in the housing base. Light sources, particularly LEDs, are arranged on the printed circuit board, which serve to illuminate the display.

[0036] HMI (Human-Machine Interface) units for hand-held tools are also known from the prior art. These units comprise a housing unit with a housing base, a circuit board with an LED arranged in the housing base, a shaft unit with a light shaft mounted on the circuit board, and a light-diffusing element. Display symbols are formed on the light-diffusing element. The light-diffusing element's task is to scatter the light emanating from the light source and generate a so-called "soft" or diffuse light. The soft light creates a translucent area on the light-diffusing element. The light source itself and its contours are no longer visible to the operator. The display symbols are formed by a contrast of translucent and opaque areas on the top side of the light-diffusing element.The opaque areas are created by a light-blocking barrier layer, such as a lacquer, on the light-diffusing element. The light-diffusing element is covered by a transparent display area of ​​the housing unit. The operator can see the display symbols on the light-diffusing element through the transparent display area. Information about the operating status of the implement or similar information can be transmitted to the operator via the display symbols.

[0037] The light diffusion element extends into the light well and rests completely against the edges of the light well. This directs all light rays in the light well into the light diffusion element. The light is scattered in the light diffusion element across the thickness of the light diffusion element. To produce sufficiently soft light, the light diffusion element requires a certain minimum height. If the light diffusion element is too high, it can happen that light intended for a first display symbol is directed to a second display symbol. This means that the second display symbol may be illuminated even if such illumination is not intended. This results in the display symbol becoming blurred.

[0038] It is therefore an object of the invention to provide an HMI unit which has a compact design of the HMI unit, a high selectivity of a display symbol and at the same time a sufficient translucency for display symbols.

[0039] This object is achieved with an HMI unit according to the features of claim 21.

[0040] The HMI unit according to the invention for a hand-held work device comprises a housing unit with a housing base body, a printed circuit board arranged in the housing base body, wherein at least one light source, in particular an LED, is arranged on the printed circuit board, a shaft unit arranged in the housing base body with at least one light shaft, wherein the at least one light source is assigned to the at least one light shaft, a diffuser arranged on the shaft unit and covering the at least one light shaft for generating a soft light, wherein the diffuser has an upper side facing the housing base body and a lower side facing the shaft unit, wherein the housing base body has a transparent display area, wherein the display area at least partially covers the diffuser, wherein the diffuser has a formed on the underside of the diffuser,light-scattering scattering layer and a light-blocking barrier layer formed on the top of the diffuser.

[0041] In the HMI unit according to the invention, the diffuser is a light-scattering element. The diffuser is designed such that it has the scattering layer on its underside, in particular only on its underside. The light is scattered on the underside of the diffuser. This creates sufficient translucency. By forming the scattering layer on the underside of the diffuser, the diffuser itself can be made comparatively thin. In other words, the diffuser has a low height. This enables a compact design of the HMI unit. By forming a low diffuser height, the scattering of the light intended for one display symbol to another display symbol is also reduced. This makes it possible to achieve a high selectivity of the individual display symbols.

[0042] It is advantageous for the diffuser to be designed as a film. The height of the diffuser is thus particularly low, which promotes the properties described above. In particular, the film has a height of less than 0.425 mm.

[0043] The diffusing layer of the diffuser is preferably formed as one or more lacquer layers. This allows the diffusing layer to be applied particularly thinly. The diffusing layer preferably has a particularly rough surface, which scatters the light. This enables sufficient translucency within the diffuser's compact installation space.

[0044] In particular, at least one display symbol is formed on the top side of the diffuser. The display symbol is preferably formed directly on the top side of the diffuser.

[0045] In particular, it is provided that a base layer is formed between the barrier layer and the scattering layer. The base layer serves, in particular, as a carrier for the scattering layer and the barrier layer. Particularly preferably, the base layer is transparent.

[0046] The diffuser is arranged, in particular, outside the at least one light shaft of the shaft unit. The diffuser rests, in particular, on the light shaft without protruding into it. The light shaft can thus be designed significantly lower.

[0047] A further object of the invention is to provide an HMI unit that can be manufactured in a simple manner and at the same time is easily adaptable for different work devices or for different functions.

[0048] This object is achieved by an HMI unit for a hand-held working device according to the features of claim 27.

[0049] The HMI unit according to the invention for a hand-held work tool comprises a housing unit with a housing base body, a printed circuit board arranged in the housing base body, wherein at least one light source, in particular an LED, is arranged on the printed circuit board, a shaft unit arranged in the housing base body with at least one light shaft, wherein the at least one light source is assigned to the at least one light shaft, a diffuser arranged on the shaft unit and covering the at least one light shaft for generating a soft light, wherein the diffuser has an upper side facing the housing base body and a lower side facing the shaft unit, wherein the diffuser has on its upper side at least one display symbol assigned to the at least one light shaft, wherein the display symbol is formed from translucent areas and opaque areas,wherein the housing base body has a transparent display area, wherein the display area at least partially covers the diffuser, wherein the translucent areas of the display symbol can be enclosed by a single, minimal outer contour, wherein the outer contour of the translucent areas is smaller than the cross-section of the at least one light shaft.

[0050] Display symbols are known from the prior art whose size or outer contour corresponds to the cross-section of the light well. The translucent area of ​​the display symbol extends into the light well, as already explained above with regard to the prior art, and contacts its inner walls. The outer contour of the translucent area, which corresponds to the contour of the cross-section of the light well, forms the frame of each display symbol.

[0051] The translucent region of the display symbol of the HMI unit according to the invention has an outer contour that is smaller than the cross-section of the associated light well. In other words, the area enclosed by the outer contour is smaller than the cross-sectional area of ​​the light well. If the HMI unit is to be equipped with a different display symbol, only the diffuser of the HMI unit needs to be replaced. Since the display symbol or the translucent region of the display symbol is smaller than the cross-section of the light well, the shape and size of the display symbol can be varied. The size of the display symbol simply needs to be selected so that it is smaller than the cross-section of the light well.

[0052] In particular, it is provided that the diffuser is arranged outside the at least one light shaft. Thus, the diffuser does not have to be molded into the light shaft, but can be designed as a simple film. If the diffuser is designed as a film, it has a light-scattering layer, particularly on its underside.

[0053] In particular, it is provided that a control element arranged on the housing unit is provided for activating at least one operating function of the HMI unit. The operator can use the control element to enter information into the HMI unit.

[0054] Further features of the invention will become apparent from the description and the drawing, which below depicts a detailed embodiment of the invention. They show:

[0055] Fig. Al in a perspective, schematic representation of a working device with an operating device,

[0056] Fig. A2 shows a schematic representation of the operating device according to the invention with a battery housing,

[0057] Fig. A3 in a perspective view of the battery housing with a predetermined breaking point from below,

[0058] Fig. A4 in a view from below the battery housing with predetermined breaking point according to Fig. A3, Fig. A5 in a sectional view the battery housing according to Fig. A3,

[0059] Fig. A6 shows a partial, enlarged sectional view of the

[0060] Predetermined breaking point of the battery housing and

[0061] Fig. A7 shows a foot of the battery housing in a sectional view along section line VII according to Fig. A4.

[0062] Further features of further blindness training arise from the

[0063] Description and the drawings described below. They show:

[0064] Fig. Bl in a perspective, schematic representation of the working device with an HMI unit,

[0065] Fig. B2 shows a perspective, schematic representation of the HMI unit according to the invention,

[0066] Fig. B3 shows a perspective exploded view of the HMI unit according to Fig. B2,

[0067] Fig. B4 in a perspective view from above of the housing body of the HMI unit according to Fig. B2,

[0068] Fig. B5 in a perspective view from below of the housing base of the HMI unit according to Fig. B2,

[0069] Fig. B6 shows a schematic view from below of the HMI unit according to Fig. B2,

[0070] Fig. B7 shows a sectional view of the HMI unit according to Fig. B2 with the control element not actuated, Fig. B8 shows a sectional view of the HMI unit according to Fig. B2 with the control element actuated,

[0071] Fig. B9 shows a schematic perspective view of another embodiment of the diffuser,

[0072] Fig. BIO in a top view of the diffuser according to Fig. B9,

[0073] Fig. Bl l shows a schematic sectional view of a diffuser according to the invention,

[0074] Fig. B12 shows a schematic perspective view of another embodiment of the diffuser,

[0075] Fig. B13 in a plan view of the diffuser according to Fig. B12,

[0076] Fig. B14 shows a schematic perspective view of an embodiment of the shaft unit and

[0077] Fig. B15 shows a plan view of the shaft unit according to Fig. B14.

[0078] Fig. A1 shows an embodiment of a working device A1 with an operating device A10 according to the invention. The working device A1 is, in particular, hand-held. Particularly preferably, the working device A1 is portable, in particular hand-carried. The term "hand-carried" is to be understood such that the working device is carried by the operator during normal operation. In the present embodiment, the working device A1 is designed as a power chainsaw. In an alternative embodiment, the working device A1 can also be designed as a free-cutting saw, brush cutter, cut-off grinder, blower, blower and vacuum cleaner, rock cutter, wood cutter, pole pruner, hedge trimmer, lawn mower, high-pressure cleaner, or similar working device.

[0079] As shown in Fig. A1, the working device A1 comprises a housing A2. The working device A1 comprises a drive motor A3. The drive motor A3 is arranged in the housing A2. The working device A1 further comprises a tool A6, wherein the tool A6 is driven by the drive motor A3. In the present exemplary embodiment, the tool A6 is a saw chain, which is only schematically represented in Fig. A1 by a dashed line. The saw chain is driven to rotate in a guide groove of a guide rail A4. The drive motor A3 drives a drive sprocket via its drive shaft, which in turn drives the saw chain A6 to rotate around the guide rail A4.

[0080] As shown in Fig. A1, the drive motor A3 in the exemplary embodiment is designed as an electric motor. The work device A1 comprises at least one battery pack A7. The battery pack A7 is provided for supplying the drive motor A3 with electrical energy. In an alternative embodiment of the work device A1, it can also be provided that a further battery pack is provided. The further battery pack is then likewise provided for supplying the drive motor A3 with electrical energy. The work device 1, in particular the drive motor A3 of the work device 1, can in such an embodiment be operated using only one of the two battery packs. In such an embodiment, both battery packs are preferably connected in series. In an alternative embodiment of the work device A1, the drive motor A3 can also be designed as an internal combustion engine.

[0081] As shown in Fig. A1, the housing A2 of the working device A1 comprises a front end A45 and a rear end A46. The guide rail A4 is attached to the housing A2 and protrudes from the housing A2 at the front end A45. In the present embodiment, the rear end A46 is formed by a handle A47 of the working device A1.

[0082] As shown in Fig. A1, the working device A1 comprises the handle A47 for resting an operator's hand. The handle A47 is formed on a handle housing A49. The handle housing A49 is part of the housing A2. The working device A1 comprises a control element A50 for actuating the drive motor A3. The control element A50 is assigned to the first handle A47, i.e. during normal operation of the working device A1, the operator actuates the control element A50 with the hand resting on the handle A47. The control element A50 is preferably designed as a control lever. The working device A1 comprises a preferably mechanical locking element A51. The locking element A51 is preferably designed as a locking lever. The locking element A51 is designed to lock the control element A50 in a locked position, preferably mechanically, and to release it in an operating position.If the operator wishes to operate control element A50, they must first unlock control element A50 by operating locking element A51. The operator can then operate control element A50 and control drive motor A3. In an alternative embodiment, the locking of control element A50 can be implemented electronically. Such an unlocking mechanism could be implemented in addition to a mechanical locking element or as an alternative to one. An electronic locking mechanism could then be released, for example, via a switch or a similar control element.

[0083] In addition to the handle A47, the working device A1 comprises a further handle A48. The further handle A48 is designed as a bow-shaped handle and surrounds the housing A2. The further handle A48 is designed in front of the handle A47. The further handle A48 can be grasped by the operator's second hand. As shown in Fig. A1, the working device A1 comprises an operating device A10. The operating device A10 is shown schematically in more detail in Fig. A2. The operating device A10 comprises a housing unit A11 with a housing base body A12 and with a battery housing A13. The housing base body A12 and / or the battery housing A13 are preferably made of plastic. The operating device A10 further comprises a control board A29. In the present exemplary embodiment, the control board A29 is connected to the control unit of the working device A1 (not shown in more detail).In an alternative embodiment, the control board A29 itself can also be provided as the control unit of the working device A1. The control unit serves, in particular, to control the drive motor A3. The control board A29 is located within the housing unit A11.

[0084] As shown in Fig. A2, the operating device A10 preferably comprises an operating element A19, which acts on the control board A29. The operating element A19 is preferably arranged on the housing base A12. Actuation of the operating element A19 actuates a circuit board element. Such a circuit board element can be designed, for example, as a pushbutton or the like. Actuation of the operating element A19 can, for example, actuate functions such as the provision of energy to the drive motor A3, the speed of the drive motor A3, or similar functions. The functions are of course not limited to the drive motor A3. The operating device A10 can also comprise multiple actuation elements that act on the control board A29.

[0085] As also schematically shown in Fig. A2, the operating device A10 comprises a display element A28. The display element A28 is preferably arranged on the housing base body A12. Operating information of the work device A1 can be transmitted to the operator via the display element A28. In this case, the display element A28 is designed as a display. It can also be provided that the display is a touch-sensitive display, allowing user inputs to be made via it. Other configurations may also be expedient.

[0086] The housing unit A11 comprises a hollow interior space A18 that is essentially hermetically sealed. The hollow interior space A18 is at least partially defined by the battery housing A13.

[0087] As shown in Fig. A2, the battery housing Al 3 is arranged on the control board A29. A battery A27 is arranged on the control board A29, which supplies the control board A29 with electrical energy. The battery A27 is enclosed by the battery housing Al 3. The battery A27 is arranged inside the battery housing Al 3. If the work tool Al is designed as an electrical, battery-operated work tool Al, the battery A27 is charged with electrical energy via the battery pack A7.

[0088] As shown in Fig. A2, the control board A29 is arranged in the housing base A12 of the operating device A10. The control board A29 has a top side A30 and a bottom side A31 opposite the top side A30. The battery A27 and the battery housing A13 surrounding the battery A27 are arranged on the bottom side A31 of the control board A29. The top side A29 of the control board A29 faces the control element A19 and the display element A28, respectively. If the design of the operating device A10 therefore has a control element A19, this acts on a board element arranged on the top side A30 of the control board A29. If the design of the operating device A10 has a display element A28, for example, light sources are arranged on the top side A30 of the control board A29, which supply the display element A29 with light.In the preferred embodiment of the operating device A10, as already described above, it comprises both an operating element A19 and a display element A28. The control board A29 is cast together with the battery housing Al 3 in the housing base body Al 2. For this purpose, a casting compound A26 is applied to the underside A31 of the control board A29, which at least partially also encloses the battery housing Al 3. The control board A29 is thus sealed by the casting compound A26. The casting compound A26 is preferably a cast resin. Other materials may also be suitable as casting compounds. The hollow interior Al 8 of the housing unit Al 1 is delimited by the battery housing Al 3 and the underside A31 of the control board A29.

[0089] As shown in Fig. A2, the operating device A10 can have a further hollow interior space Al8'. In the present, preferred embodiment, this is formed between the top side A30 of the control board A29 and the housing base body A12. The hollow interior space Al8 between the bottom side A31 of the control board A29 and the battery housing Al3 and the further hollow interior space Al8' are separated from one another by the control board A29. In an alternative embodiment, it can also be provided that the two interior spaces Al8, Al8' are fluidly connected to one another via a channel, which is formed, for example, by an opening in the control board A29.

[0090] Figure A3 shows a perspective view of the Al 3 battery housing. The Al 3 battery housing has at least one predetermined breaking point A20. The predetermined breaking point serves to allow a targeted rupture in the Al 3 battery housing if excess pressure develops in the Al 3 battery housing. A flow connection is created between the environment and the Al 8 interior space, allowing pressure equalization. Such excess pressure can arise in the Al 8 interior space due to the outgassing of the battery A27.

[0091] As shown in Fig. A3, the battery housing A13 comprises a housing wall A14. The predetermined breaking point A20 is a partial thinning A21 in the housing wall A14. The partial thinning A21 of the housing wall A14 is preferably formed as a groove-like depression on the outer side of the housing wall A14 of the battery housing A13. The predetermined breaking point A20 is designed such that pressure equalization occurs, in particular, at a pressure value between 10 bar and 30 bar, preferably between 15 bar and 25 bar, advantageously between 18 bar and 23 bar, most particularly at a maximum of 20.7 bar, preferably at approximately 18 bar.

[0092] The battery housing Al 3 has a housing base Al 6 and a housing shell Al 5 adjoining the housing base Al 6. As shown in Fig. A3, the battery housing Al 3 is pot-shaped. The housing base Al 6 therefore corresponds to a pot base, and the housing shell Al 5 to a pot shell. The housing shell Al 5 is approximately cylindrical and closed on one side by the housing base Al 6. Of course, other geometries of the battery housing A13, for example, a cuboid shape or the like, may also be suitable.

[0093] In the preferred embodiment, the predetermined breaking point A20 is formed on the housing base Al 6. In an alternative embodiment of the operating device A10, it may also be expedient to form the predetermined breaking point A20 on the housing shell Al 5. The battery housing Al 3 has a longitudinal center axis A32. The housing shell Al 5 extends along the longitudinal center axis A32 of the battery housing Al 3 from a first end A33 to a second end A34. The housing base A16 is arranged at the first end A33 of the housing shell A15. The second end A34 of the housing shell Al 5 is a free end. At the second end A34 of the battery housing Al 3, the battery housing Al 3 is cast onto the control board A29 using the casting compound A26. The casting compound A26 does not cover the predetermined breaking point A20, in particular not the housing base Al 6 of the battery housing Al 3.This ensures that the predetermined breaking point A20 can be opened in the event of overpressure, so that a flow connection can be established between the environment and the interior space Al 8 of the housing unit Al 1. In other words, the predetermined breaking point A20, in particular the housing base Al 6, is free of casting compound A26.

[0094] As shown in Figures A3, A4, A5 and A7, the battery case A13 comprises several

[0095] Feet Al 7. The feet Al 7 are in the preferred embodiment on the second

[0096] end A34 of the housing shell Al 5. A different position of the feet Al 7 on the battery housing Al 3 may also be expedient. The feet Al 7 are cast into the casting compound A26. The feet Al 7 serve to anchor the battery housing Al 3 in the casting compound A26 so that in the event of corresponding overpressure in the interior Al 7, the battery housing Al 3 is not pressed out of the casting compound A26. If a corresponding overpressure is present in the interior Al 7, this causes an axial force acting on the housing base Al 6 in the direction of the longitudinal center axis A32 of the battery housing Al 3. The plurality of feet Al 7 of the battery housing Al 3 extend from the housing shell Al 5 radially towards the longitudinal center axis A32 of the battery housing Al 3 away from the longitudinal center axis A32. As a result, the feet Al 7 of the battery housing Al 3 engage behind the casting compound A26 in such a way that when an axial force acts on the housing base Al 6, they act in a form-fitting manner against the casting compound A26.The feet Al 7 of the battery housing Al 3 form an undercut in the direction of the longitudinal center axis A32 of the battery housing Al 3. In the present embodiment, four feet Al 7 are provided on the housing shell Al 5. Adjacent feet Al 7 are preferably spaced at equal angular intervals relative to the longitudinal center axis A32 of the battery housing Al 3. This ensures that the battery housing Al 3 is firmly held in the casting compound A26. Of course, a different number of feet Al 7 on the housing shell Al 5 may also be expedient.

[0097] Fig. A7 shows the battery housing Al 3. A pin A35 is formed on at least one foot Al 7, which extends from the housing base Al 6 away from the battery housing Al 3. The pin Al 7 preferably serves to position the battery housing Al 3 on the control board A29, in particular on the underside A31 of the control board A29, before the battery housing Al 3 is encapsulated with the control board A29 in the housing base body A12. In the preferred embodiment, a pin A36 is arranged on each of two feet A17. This determines the position of the battery housing Al 3 on the control board A29.

[0098] As shown in Figures A3 and A4, the predetermined breaking point A20 comprises a central region A22. The central region A22 of the predetermined breaking point A20 is preferably arranged centrally on the housing base A16. The central region A22 of the predetermined breaking point A20 is preferably located centrally in the housing base A16 such that it is intersected by the longitudinal central axis A32 of the battery housing A13. Furthermore, the predetermined breaking point A20 comprises several, in particular four, legs A23. The legs A23 likewise form partial thinnings A21 of the housing wall A14, which are provided for targeted rupture in the event of excess pressure in the interior A18. The legs A23 extend from the central region A22 away from the longitudinal central axis A32 of the battery housing A13. Particularly preferably, the legs A23 extend radially to the central region A22. Preferably, the plurality of legs A23 each extend from a proximal end 24, which is arranged at the central region, to a free, distal end A25.The distal end A25 of each leg A23 is circular. This is intended to reduce stress concentrations and thus stress peaks at the distal end of the leg.

[0099] As shown in Fig. A4, the housing base A16 is divided into several segments A37 by the plurality of legs A23. Adjacent legs A23 are at uniform angular distances relative to the longitudinal center axis A32 of the battery housing A13. In the present, preferred exemplary embodiment, four legs A23 are provided, which form a cross-shaped predetermined breaking point A20. Thus, the segments A37 in a preferred embodiment of the operating device A10 are also of uniform design. Each segment A37 has a foot A38, shown in dashed lines, which extends between two adjacent distal ends A25 of two legs A23. If the battery housing A13 breaks along its predetermined breaking point A20, each segment A37 remains attached to the housing base A16 via its foot A38. Splintering of the segment A37 can thus be avoided.

[0100] Fig. A6 shows an enlarged view of the central region A22 of the predetermined breaking point A20. In this view, it is particularly clearly visible that the predetermined breaking point A20 forms a partial thinning of the housing wall A14 of the battery housing A13. The housing wall A14 has a wall thickness Aa adjacent to the predetermined breaking point A20, i.e. directly adjoining the predetermined breaking point A20. Furthermore, the housing wall A13 has a wall thickness Ab in the partial thinning A21 that is less than the wall thickness Aa. The wall thickness Aa of the housing wall A14 adjacent to the predetermined breaking point A20 is preferably less than 1 mm, particularly preferably less than 0.8 mm, in particular approximately 0.7 mm. The wall thickness Ab of the housing wall A14 of the battery housing A13 in the partial thinning A21 is preferably at most 0.5 mm, in particular approximately 0.4 mm.Particularly preferably, the wall thickness Ab of the housing wall A14 in the partial thinning A21 is at least 30%, in particular at least 50%, and / or particularly preferably at most 70% of the wall thickness Aa of the housing wall Al3 of the battery housing Al3 adjacent to the predetermined breaking point A20. The wall thickness of the housing wall A14 is essentially constant in the partial thinning A21, i.e., at least 60%, preferably at least 70% of the housing wall A14 in the partial thinning A21 has the same wall thickness Ab.

[0101] Fig. A5 schematically shows a sprue A39, which is used to feed the casting material into the casting mold of the battery housing A13. The sprue A39 is located outside the predetermined breaking point A20 of the battery housing Al3. It has been found that with sprue arrangements that open directly into the predetermined breaking point A20, local thickenings can occur. The intended wall thickness Ab of the housing wall A14 cannot therefore be reliably maintained. This results in an undesirable increase in the opening pressure of the battery housing Al3. In order to reliably and reproducibly achieve a constant wall thickness Ab at the partial thinning A21 of the housing wall A14, the sprue A39 on the casting mold must be positioned outside the predetermined breaking point A20.

[0102] The work device A1 comprises a housing A2, a drive motor A3 arranged in the housing A2, a tool A6 which can be driven by the drive motor A3 and an operating device A10, comprising a housing unit with a housing base body and with a battery housing, wherein the housing unit comprises a substantially airtight, hollow interior space, wherein the battery housing at least partially delimits the interior space, an operating element arranged on the housing unit for actuating at least one operating function of the operating device and / or a display element arranged on the housing unit for transmitting information to the operator, wherein the battery housing has at least one predetermined breaking point for pressure equalization between the interior space and the environment in the event of overpressure in the interior space of the housing unit.

[0103] In Fig. Bl, a further embodiment of a working device B 1 with an inventive _,The HMI unit BIO is shown. The implement B1 is, in particular, hand-held. Particularly preferably, the implement is portable, in particular hand-carried. The term "hand-carried" is to be understood such that the implement B1 is carried by the operator during normal operation. In the present exemplary embodiment, the implement B1 is designed as a power chainsaw. In an alternative embodiment, the implement B1 can also be designed as a brush cutter, brush cutter, cut-off grinder, blower, blower and vacuum cleaner, stone cutter, wood cutter, pole pruner, hedge trimmer, lawn mower, high-pressure cleaner, or similar implement.

[0104] As shown in Fig. B1, the working device B1 comprises a housing B2. The working device B1 has a drive motor B3, which is only schematically indicated by a dotted line. ,The drive motor B3 is arranged in the housing B2. The working device B1 further comprises a tool B6. The tool B6 is driven by the drive motor B3. In the present embodiment, the tool B6 is a saw chain, which is only schematically shown in Figure B1 by a dashed line. The saw chain is driven in a rotating manner in a guide groove of a guide rail B4. _,The drive motor B3 drives a drive sprocket via its drive shaft, which in turn drives the saw chain B6 to rotate around the guide bar B4. As shown in Fig. B1, the drive motor B3 in the exemplary embodiment is designed as an electric motor. The work tool B1 comprises at least one battery pack B7. The battery pack B7 is provided for supplying the drive motor B3 with electrical energy. In an alternative embodiment of the work tool B1, it can also be provided that a further battery pack is provided. The further battery pack is then likewise provided for supplying the drive motor B3 with electrical energy. The work tool B1, in particular the drive motor B3 of the work tool B1, can in such an embodiment be operated using only one of the two battery packs. In such an embodiment, both battery packs are preferably connected in series.In an alternative embodiment of the working device B1, the drive motor B3 can also be designed as an internal combustion engine.

[0105] As shown in Fig. B1, the housing B2 of the working device B1 comprises a front end 45 and a rear end 46. The guide rail B4 is attached to the housing B2 and protrudes from the housing B2 at the front end 45. The rear end 46 is formed in the present embodiment by a handle B47 of the working device B1.

[0106] As shown in Fig. B1, the working device B1 comprises the handle B47 for resting the operator's hand. The handle B47 is formed on a handle housing B49. The handle housing B49 is part of the housing B2. The working device B1 comprises a control element B50 for actuating the drive motor B3. The control element B50 is assigned to the first handle B47, i.e. during normal operation of the working device B1, the operator actuates the control element B50 with the hand resting on the handle B47. The control element B50 is preferably arranged on the handle B47. The control element B50 is preferably designed as a control lever. The working device B1 includes a, preferably mechanical, locking element B51. The locking element B51 is preferably designed as a locking lever. The locking element B51 is designed to lock the control element B50 in a locked position, preferably mechanically, and to release it in an operating position.The locking element B51 is assigned, in particular, to the handle B47, in particular arranged on the handle B47. If the operator wishes to operate the control element B50, he or she must first unlock the control element B50 by actuating the locking element B51. The operator can then actuate the control element B50 and control the drive motor B3. In an alternative embodiment, the locking of the control element B50 can be implemented electronically. Such an unlocking could be implemented in addition to a mechanical locking element or as an alternative to one. An electronic lock could then be canceled, for example, via a switch or a comparable operating element.

[0107] In addition to the handle B47, the work tool B1 includes a further handle B48. The further handle B48 is designed as a loop handle and surrounds the housing B2. The further handle B48 is located in front of the handle B47. The further handle B48 can be grasped by the operator's left hand.

[0108] As shown in Fig. B1, the work device B1 comprises an HMI (Human-Machine Interface) unit BIO. An HMI unit is a “human-machine interface” unit or a “human-machine interface” unit. Such an HMI unit usually has input functions and / or output functions, i.e. the user of the HMI unit can transfer functions, parameters, etc. to the machine, in particular to the work device, via control elements of the HMI unit and / or receive functions, parameters, etc. from the machine, in particular the work device, from the machine. The HMI unit BIO is shown schematically in Figure B2. The HMI unit BIO comprises a housing unit B11 with a housing base body B12. The HMI unit BIO comprises in particular at least one control element B16. The control element B16 is arranged in particular on the housing unit B11.The operating element B 16 serves to actuate at least one operating function of the HMI unit BIO. The operating element B 16 is held on the housing base B 12 via a holder B 18. The operating element B 16 is designed in particular as a button. In the preferred embodiment, the HMI unit BIO comprises in particular a further operating element B 17. The further operating element B 17 is held on the housing base B 12 via a further holder B 19. The further operating element B 17 serves to actuate a further operating function of the HMI unit BIO, in particular for switching the working device B 1 on and off. In an alternative embodiment of the working device B 1, it can also be provided that the HMI unit BIO has additional operating elements.

[0109] As schematically indicated in Fig. B2, the HMI unit BIO comprises, in particular, a display element B20. The display element B20 serves to transmit information to the operator. The display element B20 is a display, which can also be used, in particular, as a touchscreen. _, sensitive display can be designed.

[0110] Fig. B3 shows an exploded view of the HMI unit BIO according to Fig. B2. The HMI unit BIO comprises, in particular, a printed circuit board B14. The printed circuit board B14 is arranged, in particular, in the housing base body B12. The HMI unit BIO comprises a shaft unit B15. The shaft unit B15 is arranged, in particular, on the printed circuit board B14. The shaft unit B15 comprises at least one light shaft B21. In particular, at least one light source B22 is arranged on the printed circuit board B14. The at least one light source B22 is designed, in particular, as an LED. The at least one light source B22 is assigned to the at least one light shaft B21. The shaft unit B15 is preferably arranged on the printed circuit board B14 such that the light source B22 sits in the light shaft B21 of the shaft unit B15. The light shaft B21 serves to transmit the light emanating from the light source B22 to a diffuser B23.The diffuser B23 serves to generate a soft light. The diffuser B23 is arranged in particular on the shaft unit B15. The diffuser B23 is arranged in particular directly on the shaft unit B15. The diffuser B23 comprises at least one display symbol B24. The at least one display symbol B24 is preferably illuminated by the light from the light source B22. The housing base body B12 is arranged, in particular directly, on the diffuser B23. The housing base body B12 is formed from a transparent plastic, so that the at least one display symbol B24 on the diffuser B23 is visible through the housing base body B12 when illuminated. The area of ​​the housing base body B12 through which the diffuser B23 is visible corresponds to the display area B70. At least the display area B70 of the housing base body B12 is transparent.

[0111] The HMI unit BIO further comprises a battery housing B13. The battery housing B13 is arranged in particular on an underside B53 of the printed circuit board B14. A battery B27 is inserted into the battery housing B13 (see Figures B7 and 8), which supplies the HMI unit BIO with electrical energy. The battery housing B13 is connected to the battery pack B7 of the work tool B1, which charges the battery B27 of the HMI unit BIO. The battery housing B13 is cast onto the printed circuit board B14 with a casting resin B26. The casting resin B26 covers the entire printed circuit board B14 and thus forms the underside of the HMI unit BIO, as shown in Figure B6.

[0112] In Fig. B4, only the housing base body B12 of the HMI unit BIO is shown. At least one mounting stud B25, B25' is arranged on the housing base body B12. The mounting stud B25, B25' serves to contact the housing B2 when the HMI unit BIO is fastened to the housing B2 of the working device B1. The mounting stud B25, B25' is designed such that the housing base body B12 is held clamped to the housing B2 by the at least one mounting stud B25, B25'. As shown in Fig. B5, the HMI unit comprises a further mounting stud B25' which is arranged on the housing base body B12. In an alternative embodiment, more than two mounting studs can be formed on the housing base body B12. The at least one mounting stud B25 and / or the further mounting stud B25' are formed from an elastic, first material. The holder B18 of the HMI unit BIO is preferably made of the elastic, first material.The receptacle B18 and the mounting studs B25, B25' are in particular formed from the same first material. Preferably, the further receptacle B19, via which the further operating element B17 is held on the housing base B12, is also formed from the same elastic first material as the receptacle B18 and the mounting studs B25, B25'. An elastic material in this case is a material whose modulus of elasticity is less than 100 MPa.

[0113] The housing base body Bl 2, the operating element Bl 6, the at least one mounting stud B25, and the receptacle B18 are particularly formed as a single piece. Particularly preferably, the additional mounting stud B25' and / or the additional receptacle B19 are also formed as a single piece with the housing base body Bl 2, the operating element Bl 6, the at least one mounting stud B25, and the receptacle B18.

[0114] To manufacture the HMI unit, the housing base body B12, the at least one operating element B16, the at least one receptacle B18 and the at least one mounting stud B25 are cast. In one process step, the housing base body B12 is cast. Furthermore, the operating element B16 is cast. It can be provided that the housing base body B12 is cast first and then the operating element B16. Alternatively, the operating element B16 and then the housing base body B12 can also be cast. It is also conceivable that the housing base body B12 and the operating element B16 are cast simultaneously. In a subsequent process step, in particular the receptacle B18 and the mounting stud B25 are cast. The receptacle B18 and the mounting stud B25 are in particular made of the same material, so that the receptacle B18 and the mounting stud B25 are cast simultaneously.Preferably, the mounting stud B25 and the receptacle B18 are connected to one another. Particularly preferably, in this subsequent method step, the additional receptacle B19 for the additional control element B17 and / or the additional mounting stud B25' is also cast with the receptacle B18 and the mounting stud B25. All casting processes are carried out, in particular, in one and the same casting mold of the HMI unit BIO. The manufacture of such casting molds is sufficiently known from the prior art, in particular for casting multiple materials. The casting process is particularly designed as an injection molding process.

[0115] The housing base body B12 is formed from a second material, in this case a rigid material. The second material is designed such that the housing base body B12 is transparent, at least in the area of ​​the display element B20, i.e., in the display area B70. This ensures that the diffuser B23, in particular the display symbol B24 of the diffuser B23, is visible through the housing base body B12. Particularly preferably, the second material is designed such that the housing base body B12 has a tint. In an alternative embodiment of the HMI unit B10, the housing base body B12 can also be provided with a coating, a paint, or the like to tint it.

[0116] The operating element B 16 is formed from a third material. The third material is also a rigid material. In an alternative embodiment, the second material and the third material can be the same. The first material is, in particular, more elastic than the second material and / or the third material.

[0117] As shown in Figures B4 and B5, the housing base body B12 comprises an outer side B32 and an inner side B33. The inner side B33 of the housing base body B12 faces the printed circuit board B14, the shaft unit B15, and the diffuser B23. The outer side B32 faces away from the printed circuit board B14, the shaft unit B15, and the diffuser B23. Furthermore, when the HMI unit BIO is in the assembled state, the outer side B32 at least partially faces the housing B2 of the working device B1. The mounting studs B25, B25' are preferably arranged on the outer side B32, in particular on the outer longitudinal sides B34, B35 of the housing base body B12. The housing base body B12 extends from a front end face B36 along its first longitudinal outer side B34 and its second longitudinal outer side B35 to its rear end face B37. In the preferred embodiment, the at least one mounting stud B25 is arranged on the first longitudinal outer side B34.The further mounting stud B25' is preferably arranged on the second longitudinal outer side B35. When the HMI unit BIO is fastened to the housing B2 of the working device B1, the housing base body B12 is held clamped to the housing B2 via the mounting studs B25, B25'. Due to the elastic first material of the mounting studs B25, B25', these are pressed in when they are fastened to the housing B2. This creates a spring-like preload between the mounting studs B25, B25' and the housing B2 of the working device B1. Thus, clamping forces are generated via the mounting studs B25, B25' on the two longitudinal outer sides B34, B35 of the housing base body B12, by means of which the HMI unit BIO is fixed to the housing B2 of the working device B1. The HMI unit BIO, in particular the housing base body B12, is held clamped to the housing B2. Of course, more than two mounting studs can be formed on the housing base body B 12.In an alternative version of the HMI unit BIO, additional mounting studs can also be provided, for example, on the front end B36 and / or the rear Stim. _, page B37.

[0118] As shown in Figures B4 and B5, the housing base body B12 comprises a top side B38 and a bottom side B39. The bottom side B39 is in particular part of the inside B33 of the housing _,base body B12. The underside B39 of the housing base body B12 faces the diffuser B23. The top side B38 faces away from the diffuser B23. The top side B38 of the housing base body B12 is accessible to the operator. The operating element B16 and / or the further operating element B17 are at least partially arranged on the top side B38 of the housing base body B12. The operator can thus actuate the operating element B16 and / or the further operating element B17 on the top side B39 of the housing base body B12. As shown in Figures B4 and B5, the operating element B16 is embedded in the receptacle B18 and / or the further operating element B17 is embedded in the further receptacle B19 and is held on the housing base body B12 via this. The receptacle B18 and / or the further receptacle B19 are formed from the elastic, first material, whereby the operating element B16 and / or the further operating _,element B17 are designed to be movable relative to the housing base body B12. The first operating element B16 and / or the second operating element B17 can be pressed in relative to the housing base body B12 due to the elastic design of the receptacle B18 and / or the further receptacle B19. The receptacle B18 and / or the further receptacle B19 yield elastically and allow a relative movement between the operating element B16 and / or the further operating element B17 relative to the housing base body B12. Contact elements B42 can be actuated by pressing in the operating element B16 and / or the further operating element B17. Such contact elements B42 are arranged in particular on the printed circuit board B14 and are part of electrical and / or electronic circuits.

[0119] As shown in Fig. B5, the at least one operating element B 16 comprises an actuating element B40. The contact element B42 of the HMI unit BIO can be actuated by means of the actuating element B40. In the present embodiment of the HMI unit BIO, the contact element B42 is designed as a microswitch. As shown in Fig. B3, a microswitch is attached to the printed circuit board B14 for each of the at least one operating element B 16 and for the further operating element B 17. However, the contact element B42 can also be designed as a mechanical lever, for example a tongue, which in turn switches an electrical or electronic circuit when actuated. The further operating element B 17 also has a further actuating element B41, by means of which the contact element B42 can be actuated. The actuating element B40 and / or the further actuating element B41 are arranged on the underside B39 of the housing base body B 12.As shown in Figures B4 and B5, the at least one operating element B16 extends from a first end B60 to a second end B61 along a first longitudinal center axis B62. The distance between the first end B60 and the second end B61, measured along the first longitudinal center axis B43, corresponds to the length Ba of the operating element B16. The operating element B16 has an upper side B63 and a lower side B64 opposite the upper side B63. The upper side B63 of the operating element B16 is designed as an actuating surface for the operator. The actuating element B40 of the operating _,The element B16 is arranged, in particular formed, on the underside B64 of the operating element B16. The adjusting element B40 of the operating element B16 is arranged centrally on the underside B64 of the operating element B16. "Centrally" means that the adjusting element B40 is located approximately at the center of gravity of the underside B64 of the operating element B16. The adjusting element B40 extends from the underside B64 of the operating element B16 along a second longitudinal center axis B44.

[0120] As shown in Figures B5, B7 and B8, the operating element B 16 comprises a first support element B66 and in particular a second support element B67. A plurality of support elements can also be provided. The first support element B66 and / or the second support element B67 are designed such that tilting of the operating element B 16 when the operating element B16 is actuated is avoided as far as possible. If the operator actuates the operating element B 16 on the upper side B63 off-center, the operating element B 16 merely tends to tilt. In conventional operating elements without support elements, such an actuating element would merely rotate without moving translationally towards the contact element. The contact element would not be actuated. If the present at least one operating element B 16 is actuated off-center, the at least one operating element B 16 is supported against tilting by the first support element B66 and / or the second support element B67.The first support element B66 and / or the second support element B67 are arranged, preferably formed, in particular on the operating element B16. The first support element B66 and / or the second support element B67 are preferably arranged, in particular formed, on the underside B64 of the operating element B16.

[0121] If the operator presses the operating element at its first end B60, it is pressed against the printed circuit board B14 by means of the first support element B66. The first support element B66 has a first support surface B68, via which the first support element B66 contacts the printed circuit board B14. If the operator presses the actuating element B40 in an area lying between the first support element B66 and the first actuating element B40, a torque is generated around the contact point between the support surface B68 of the first support element B66 and the printed circuit board B14. This torque causes the operating element B16 to rotate around the contact point between the support surface B68 and the printed circuit board B14. Consequently, the actuating element B40 also moves translationally towards the contact element B42, even though the operator actuates the operating element B16 off-center. The operation just described also applies analogously to the second support element B67 with a second support surface B69.The support elements B66, B67, in particular the support surfaces B68, B69 of the support elements B66, B67, are designed for contact with the printed circuit board B14. Particularly preferably, the support elements B66, B67 project beyond the actuating element B40 along the second longitudinal center axis B44 of the actuating element B40 in the direction away from the underside B64 of the operating element B16.

[0122] As shown in Figures B5, B7 and B8, the first support element B66 is arranged in particular in the region of the first end B60, and the second support element B67 is arranged in particular in the region of the second end B61 of the operating element B16. In an alternative embodiment, multiple support elements can also be used. The first support element B66 and / or the second support element B67 are preferably approximately pin-shaped. With one end of the support element B66, B67, the respective support element B66, B67 is connected to the underside B64 of the operating element B16. The support surface B68, B69 is formed at a free end of the support element B66, B67. In an alternative embodiment, it can also be provided to provide a support element in the form of a circumferential collar. Other shapes of the support elements B66, B67 can also be expedient.

[0123] The further outward the support elements B66, B67 are arranged on the underside B64 of the operating element B16, the further outward the operator can actuate the operating element B16 and still achieve actuation of the contact element B42 via the actuating element B40. The maximum distance Bb between the first support surface B68 of the at least one first support element B66 and the first longitudinal center axis B44 of the actuating element B40 corresponds to at least 35%, preferably at least 40%, of the length Ba of the operating element B16. The maximum distance Bb' between the second support surface B69 of the second support element B67 and the first longitudinal center axis B44 of the actuating element B40 corresponds to at least 35%, preferably at least 40%, of the length Ba of the operating element B16.

[0124] As shown in Fig. B5, the first support surface B68 of the first support element B66 and the second support surface B69 of the second support element B67 have a maximum distance c between them. This maximum distance c between the two support surfaces B68, B69 corresponds to at least 70%, in particular at least 80%, of the length Ba of the operating element B16.

[0125] As shown in Figs. B4 and B5, the additional control element B17 is significantly smaller than the control element B16 of the HMI unit BIO. Furthermore, the additional control element B17 is circular and located on the top side of the housing base. Due to its small size, the use of a support element to prevent tilting is not necessary. In an alternative embodiment, it may also be conceivable to arrange additional larger control elements, which in turn require support elements to simplify actuation of the control element. Figures B9 and B10 show an embodiment of the diffuser B23 of the HMI unit BIO. The diffuser B23 is a light scattering element. The diffuser B23 serves to generate a soft or scattered light. The diffuser B23 also comprises at least one display symbol B24. In the embodiment according to Figures B9 and B10, the diffuser B23 comprises three display symbols B24.A different number of display symbols B24 may also be appropriate. The diffuser B23 has a top side B71 and a bottom side B72. The display symbols B24 are formed on the top side B71. The top side B71 of the diffuser B23 faces the housing base body B12, in particular the display area B70 of the housing base body B12. The bottom side B72 of the diffuser B23 faces the shaft unit B15.

[0126] The diffuser B23 is designed, in particular, as a film. The film has a height Bd that corresponds to the distance between the top side B71 of the diffuser B23 and the bottom side B72 of the diffuser B23 (Fig. B1 1). The height Bd of the film is, in particular, less than 2 mm, in particular less than 1.5 mm, in particular less than 1 mm.

[0127] Fig. B1 1 shows a schematic cross-section of a diffuser B23 according to the invention. The diffuser B23 has a plurality of layers B73, B74, B75. On the upper side B71 of the diffuser B23, in particular, a light-blocking barrier layer B75 is formed. On the underside B72 of the diffuser B23, in particular, a light-scattering scattering layer B74 is formed. Furthermore, the printed circuit board B14, on which a light source B22 is arranged, is shown. The shaft unit B15 is located on the printed circuit board B14. The light source B22 is assigned to a light shaft B21 of the shaft unit B15, in particular is arranged in the light shaft B21. The light source B22 emits directed light. The light is shown schematically by individual lines. The directed light is guided through the light shaft B21 to the diffuser B23. The diffuser B23 is arranged, in particular directly, on the light unit B15.The diffuser B23 rests, in particular with its scattering layer B74, on the light shaft B21 of the shaft unit B15. The diffuser B23 is arranged entirely outside the light shaft B21 of the shaft unit B15. When the directed light reaches the scattering layer B74 on the underside B72 of the diffuser B23, the light is scattered in the scattering layer B74. The scattered light is also schematically represented by individual lines. The scattering layer B74 itself is a translucent layer of the diffuser B23.

[0128] The scattering layer B74 is particularly preferably formed by a layer of lacquer. It can also be provided that the scattering layer B74 is formed from several lacquer layers, in particular from two lacquer layers, preferably from three lacquer layers. The scattering layer B74 can be formed over the entire underside B72 of the diffuser B23. It can also be provided that the scattering layer B74 is formed only partially on the underside B72 of the diffuser B23.

[0129] As shown in Fig. B1 1, the light from the scattering layer B74 radiates as scattered light into a base layer B73 of the diffuser B23. The base layer B73 is preferably arranged between the scattering layer B74 and the barrier layer B75. The base layer B73 preferably directly adjoins the scattering layer B74. In particular, the base layer B73 directly adjoins the barrier layer B75. In an alternative embodiment, it may also be provided to provide more than three layers.

[0130] The base layer B73 of the diffuser B23 is preferably transparent. The scattered light radiates through the base layer B73 of the diffuser B23 to the barrier layer B75 of the diffuser B23. The soft, scattered light is transmitted from the scattering layer B74 via the base layer B73 to the barrier layer B75.

[0131] As shown in Fig. B1 1, the display symbol B24 is formed on the upper side B71 of the diffuser B23. The display symbol B24 is formed by at least one translucent region B76 and by at least one opaque region B77 of the diffuser B23 on its upper side B71. The opaque region B77 is formed by the barrier layer B75. The barrier layer B75 is opaque. The barrier layer B75 is preferably formed as one or more lacquer layers on the upper side B71 of the diffuser B23. The barrier layer B75 blocks all light emanating from the light source B2, so that it cannot shine through the upper side B71 of the diffuser B23 in the region of the barrier layer B75.

[0132] The translucent region B76 of the diffuser B23 is formed by a recess B82 in the barrier layer B75. In other words, no barrier layer B75 is provided in the translucent region B76 on the top side B71 of the diffuser B23. The light scattered by the scattering layer B74 can pass through the top side B71 of the diffuser B23 in the translucent region B76 of the top side B71 of the diffuser B23. The contour of the display symbol B24 is formed from the contrast between the translucent region and the opaque region B77.

[0133] Figures B12 and B13 show an alternative embodiment of the diffuser B23 of the HMI unit BIO. The diffuser B23 also has at least one display symbol B24, in this case three display symbols B24.

[0134] Figures B14 and B15 show an alternative embodiment of the shaft unit B15. This embodiment of the shaft unit B15 is intended for an HMI unit B10, which is compatible with the embodiments of the diffuser B23 according to Figures B9, B10, B12, B13. The shaft unit B15 has at least one light shaft B21. In the exemplary embodiment, the shaft unit B15 has several light shafts B21. The shaft unit B15 comprises a top side B83 and a bottom side B84. The diffuser B23 rests on the top side B83 of the shaft unit B15, in particular with its bottom side B72. The diffuser B23 lies outside all light shafts B21 of the shaft unit B15. The bottom side B84 of the shaft unit B15 faces the printed circuit board B14. In the preferred embodiment, the bottom side B84 of the shaft unit B15 contacts the printed circuit board B14.As shown in Figures B14 and B15, a projection B88 is formed on the upper side B83 of the shaft unit B15. The projection B88 is preferably formed at a corner of the shaft unit B15. The projection B88 serves as a fitting element for the correct arrangement of the diffuser B23 on the upper side B83 of the shaft unit B15. In turn, the diffuser B23 is designed such that it can only be placed in a predetermined arrangement on the upper side B83 of the shaft unit B15. Errors during assembly of the HMI unit BIO can thus be avoided. Furthermore, when attaching the diffuser B23 to the shaft unit B15, the diffuser B23 can simply be placed against the projection B88. This then serves as an assembly stop. Simple assembly is ensured. Furthermore, the diffuser B23 is preferably adhesively bonded to the shaft unit B15, in particular to the upper side B83 of the shaft unit B15.

[0135] As shown in Figures B14 and B15, several alignment pins B89 are provided on the underside B84 of the shaft unit B15. Corresponding mating openings are formed on the printed circuit board B14, into which the alignment pins B89 of the shaft unit B15 engage. A predefined, precise alignment of the shaft unit B15 and the printed circuit board B14 is ensured.

[0136] As shown in Figures B14 and B15, the present shaft unit B15 comprises three light shafts, namely a first light shaft B21', a second light shaft B21", and a third light shaft B21'". The light shafts B21', B21", B21'" are designed as through-openings and extend from the top side B83 of the shaft unit B15 to the bottom side B84 of the shaft unit B15. Each light shaft B21', B21", B21'" of the shaft unit B15 is assigned a light source B22, wherein the respective light source B22 is preferably fastened to the printed circuit board B14 and simultaneously arranged in the respective light shaft B21', B21", B21'". Several light sources B22 can also be provided per light shaft B21', B21", B21'". The light sources B22 can be switched separately from one another.As shown in Figures B9 and B10, the diffuser B23 comprises three display symbols B24, namely a first display symbol B24', a second display symbol B24", and a third display symbol B24'". The first display symbol B24' is designed as a brake symbol. The second display symbol B24" is designed as an arrow symbol. The third display symbol B24'" is designed as a temperature symbol. The first display symbol B24' of the diffuser B23 is assigned to the first light shaft B21' of the shaft unit B15, i.e., the display symbol B24' is arranged above the light shaft B2T and can be illuminated by the light beams guided in the light shaft B2T. The second display symbol B24" of the diffuser B23 is assigned to the second light shaft B21" of the shaft unit B15. The third display symbol B24" of the diffuser B23 is assigned to the third light shaft B21'" of the shaft unit B 15.

[0137] As shown in Figures B12 and B13, this diffuser B23 differs from the diffuser B23 according to Figures B9 and B10 only in the design of the display symbols B24. This diffuser B23 also has three display symbols B24, with the first display symbol B24', the second display symbol B24", and the third display symbol B24'" each being designed as an arrow symbol. Analogous to the design of the diffuser B23 according to Figures B9 and B10, here too, the first display symbol B24' is assigned to the first light shaft B2T, the second display symbol B24" to the second light shaft B21", and the third display symbol B24'" to the third light shaft B2T".

[0138] As already explained above, each display symbol B24', B24", B24'" is formed from a translucent area B76 and an opaque area B77. Each display symbol B24', B24", B24'" comprises a minimal outer contour B78. The minimal outer contour B78 encloses the entire translucent area B76 of a single display symbol B24', B24", B24'". The minimal outer contour B78 encloses an area 79 in which all translucent areas B76 of a single display symbol B24', B24", B24'" are included (Fig. B9, 12). As shown in Fig. B15, each light well B21', B21", B21" comprises a cross-section B80. The cross-section B80 of each light well B21', B21", B21'" is aligned parallel to the top B83 of the shaft unit B15. The cross-section B80 refers to the area of ​​the light well B21', B21", B21'" to which the diffuser B23 is adjacent. In other words, the cross-section B80 is measured at the top of the light wells B21', B21", B21'".The cross-sectional area B81 of a cross-section B80 of at least one of the light shafts B21', B21", B21'" is larger than the area B79 of the associated display symbol B24', B24'" enclosed by the minimum outer contour B78. In other words, at least one display symbol B24', B24'" is smaller than the cross-sectional area B81 of the associated light shaft B21', B21'". As shown in the embodiments according to Figures B9 to B15, the first display symbols B21' of the diffusers B23 differ in size. The shaft unit B15, on the other hand, is unchanged and compatible with both diffusers B23. With one embodiment of the shaft unit B15, various diffusers B23 can be used, whose display symbols B24', B24", B24'" can differ in size and type.

Claims

Claims 1. An operating device for a hand-held implement, in particular a portable and hand-held implement, comprising a housing unit (A1 1) with a housing base body (A1 2) and with a battery housing (A1 3), wherein the housing unit (A1 1) comprises a substantially hermetically sealed, hollow interior space (A1 8), wherein the battery housing (A1 3) at least partially delimits the interior space (A1 8), an operating element (A19) arranged on the housing unit (A1 1) for actuating at least one operating function of the operating device (10) and / or a display element (28) arranged on the housing unit (A1 1) for transmitting information to the operator, characterized in that the battery housing (A1 3) has at least one predetermined breaking point (A20) for pressure equalization between the interior space (A1 8) and the environment in the event of overpressure in the interior space (A1 8) of the housing unit (A1 1), wherein the predetermined breaking point (A20) is designed in particular such thatthat the pressure equalization takes place in particular at a pressure value between 10 bar and 30 bar, preferably between 15 bar and 25 bar, advantageously between 18 bar and 23 bar, very particularly at a maximum of 20.7 bar, preferably at approximately 20.7 bar.

2. Operating device according to claim 1, characterized in that the battery housing (A13) has a housing wall (A14), wherein the predetermined breaking point (A20) is formed by a partial thinning (A21) of the housing wall (A14).

3. Operating device according to claim 1 or 2, characterized in that the battery housing (Al 3) is pot-shaped, wherein the predetermined breaking point (A20) is arranged on a pot bottom (Al 6) of the battery housing (A13), in particular centrally.

4. Operating device according to one of claims 1 to 3, characterized in that the predetermined breaking point (A20) has a central region (A22) and several, in particular four, legs (A23) extending from the central region (A22).

5. Operating device according to claim 4, characterized in that the plurality of legs (A23) each extend from a proximal end (A24) at the central region (A22) to a free, distal end (A25).

6. Operating device according to claim 5, characterized in that the distal end (A25) of the plurality of legs (A23) is circular.

7. Operating device according to one of claims 1 to 6, characterized in that the predetermined breaking point (A20) is cross-shaped.

8. Operating device according to one of claims 1 to 7, characterized in that the battery housing (Al 3) is cast with the housing body (A12), wherein the battery housing (A13) has several, in particular four feet (Al 7) which are cast in the casting compound (A26).

9. Operating device according to one of claims 1 to 8, characterized in that the housing unit (Al 1) is in particular made entirely of plastic.

10. Hand-held working device with an operating device according to one of claims 1 to 9 11. HMI unit for a hand-held implement, comprising a housing unit (Bl 1) with a housing base body (Bl 2), an operating element (Bl 6) arranged on the housing unit (Bl 1) for actuating at least one operating function of the HMI unit (B10), wherein the operating element (Bl 6) is held on the housing base body (Bl 2) via a receptacle (Bl 8), characterized in that the receptacle (Bl 8) is formed from an elastic, first material such that the operating element (B16) can be actuated in a relative movement with respect to the housing base body (B12), that at least one mounting stud (B25, B25') is formed on the housing base body (B12) for contact with a housing (B2) of the hand-held implement (Bl), wherein the at least one mounting stud (B25, B25') and the receptacle (Bl 8) are formed from the same, first material, and that Control element (Bl 6), the holder (Bl 8), the housing base (B12) and the mounting studs (B25,B25') are formed in one piece., 12. HMI unit according to claim 11, characterized in that the housing base body (Bl 2) is formed from a second material and / or the operating element (Bl 6) is formed from a third material, wherein the first material is different from the second material and the third material, wherein the first material is in particular more elastic than the second material and / or the third material.

13. HMI unit according to claim 11 or 12, characterized in that at least two or more mounting studs (B25, B25') are formed on the housing base body (B12).

14. HMI unit according to one of claims 11 to 13, characterized in that the housing base body (B12) has an outer side (B32) and an inner side (B33), wherein the outer side (B32) faces the housing (B2) of the working device (B1) when the HMI unit (B10) is fastened to the housing (B2) of the hand-held working device (B1), wherein the at least one mounting stud (B25, B25') is formed on the outer side (32) of the housing base body (B12).

15. A method for producing an HMI unit for a hand-held implement, wherein the HMI unit comprises a housing unit (Bl 1) with a housing base body (Bl 2), an operating element (Bl 6) arranged on the housing unit (Bl 1) for actuating at least one operating function of the HMI unit (BIO), a receptacle (Bl 8) for connecting the operating element (Bl 6) to the housing base body (Bl 2), and at least one mounting stud (B25, B25') formed on the housing base body (B12) for contact with a housing (B2) of the hand-held implement (Bl), comprising the following steps: - Casting of the housing base body (B12), - Casting of the control element (B 16), - Casting the receptacle (B1 8) and the at least one mounting stud (B25, B25') with a first material, wherein the first material is designed to be elastic such that the operating element (BIO) can be actuated in a relative movement with respect to the housing base body (B12).

16. HMI unit for a hand-held working device, comprising a housing unit (Bl 1) with a housing base body (Bl 2), an operating element (Bl 6) arranged on the housing unit (Bl 1) for actuating at least one operating function of the HMI unit (BIO), wherein the operating element (B16) extends from a first end (B60) to a second end (B61) along a first longitudinal central axis (B43) over a length (Ba), wherein the operating element (BIO) is designed to be movable relative to the housing base body (Bl 2), wherein the operating element (B16) has an upper side (B63) with an actuating surface (B65) for the operator and a lower side (B64) opposite the upper side (B63), wherein an adjusting element (B40) with a second longitudinal central axis (B44) is arranged centrally on the lower side (B64) of the operating element (B16), wherein a contact element (B42) of the HMI unit can be actuated by means of the adjusting element (B40) (BIO), characterized in thatthat the HMI unit (BIO) has at least one first support element (B66) with a first support surface (B68), wherein the at least one first support element (B66) is designed to prevent tilting of the operating element (B16), and that the maximum distance (Bb) between the first support surface (B68) of the at least one first support element (B66) and the second longitudinal center axis (B44) of the actuating element corresponds to at least 35%, preferably at least 40% of the length (Ba) of the operating element (B16).

17. HMI unit according to claim 16, characterized in that the HMI unit (BIO) has at least one second support element (B67) with a second support surface (B69), wherein the maximum distance (Bc) between the first support surface (B68) and the second support surface (B69) corresponds to at least 70%, in particular at least 80% of the longitudinal (Ba) of the operating element (B1 6).

18. HMI unit according to claim 16 or 17, characterized in that the at least one first support element (B66) and / or that at least one second support element (B67) is formed on the underside (B64) of the operating element (B1 6) and extends in the direction of the second longitudinal center axis (B44) of the actuating element (B40) and in particular projects beyond the actuating element (B40) in the direction of the second longitudinal center axis (B44) of the actuating element (B40).

19. HMI unit according to one of claims 11 to 14 or 16 to 18, characterized in that the HMI unit (BIO) comprises at least one display element (B20) arranged on the housing unit (B1 1) for transmitting information to the operator.

20. HMI unit according to one of claims 11 to 14 or 16 to 19, characterized in that a printed circuit board (14) is arranged in the housing base body (Bl 2).

21. HMI unit for a hand-held work tool, comprising a housing unit (B11) with a housing base body (B12), a printed circuit board (B14) arranged in the housing base body (B12), wherein at least one light source (B22), in particular an LED, is arranged on the printed circuit board (B14), a shaft unit (B15) arranged in the housing base body (B12) with at least one light shaft (B21), wherein the at least one light source (B22) is assigned to the at least one light shaft (B21), a diffuser (B23) arranged on the shaft unit (B15) and covering the at least one light shaft (B21) for generating a soft light, wherein the diffuser (B23) has an upper side (B71) facing the housing base body (B12) and a lower side (B72) facing the shaft unit (B15). has, wherein the housing base body (B12) has a transparent display area (B70), wherein the display area (B70) at least partially covers the diffuser (B23), characterized in that the diffuser (B23) comprises a light-scattering scattering layer (B74) formed on the underside (B72) of the diffuser (B23) and a light-blocking barrier layer (B75) formed on the upper side (B71) of the diffuser (B23).

22. HMI unit according to claim 21, characterized in that the diffuser (B23) is designed as a film, wherein the film in particular has a height (Bd) of less than 0.425 mm.

23. HMI unit according to claim 21 or 22, characterized in that the scattering layer (B74) is formed as one or more lacquer layers.

24. HMI unit according to one of claims 21 to 23, characterized in that at least one display symbol (B24) is formed on the upper side (B71) of the diffuser (B23).

25. HMI unit according to one of claims 21 to 24, characterized in that a base layer (B73) is formed between the barrier layer (B75) and the scattering layer (B74), wherein the base layer (B73) is in particular transparent.

26. HMI unit according to one of claims 21 to 25, characterized in that the diffuser (B23) is arranged outside the at least one light shaft (B21) of the shaft unit (B15).

27. HMI unit for a hand-held tool, comprising a housing unit (B11) with a housing base body (B12), a printed circuit board (B14) arranged in the housing base body (B12), wherein at least one light source (B22), in particular an LED, is arranged on the printed circuit board (B14), a shaft unit (B15) arranged in the housing base body (B12) with at least one light shaft (B21), wherein the at least one light source (B22) is assigned to the at least one light shaft (B21), a diffuser (B23) arranged on the shaft unit (B15) and covering the at least one light shaft (B21) for generating a soft light, wherein the diffuser (B23) has an upper side (B72) facing the housing base body (B12) and a lower side (B71) facing the shaft unit (B15), wherein the diffuser (B23) has on its upper side (B72) at least one display symbol (B24) associated with the at least one light shaft (B21),wherein the display symbol (B24) is formed from translucent regions (B76) and opaque regions (B77), wherein the housing base body (B12) has a transparent display region (B70), wherein the display region (B70) at least partially covers the diffuser (B23), characterized in that the translucent regions (B76) of the display symbol (B24) can be enclosed by a single, minimal outer contour (B78) on the upper side (B71) of the diffuser (B23), wherein the area (B79) enclosed by the outer contour (B78) is smaller than the cross-sectional area (B81) of the cross section (B80) of the at least one light shaft (B21).

28. HMI unit according to claim 27, characterized in that the diffuser (B23) is arranged outside the at least one light shaft (B21).

29. HMI unit according to claim 27 or 28, characterized in that the diffuser (B23) has a light-scattering scattering layer (B74) on its underside (B72).

30. HMI unit according to one of claims 21 to 29, characterized in that an operating element (Bl 6) arranged on the housing unit (Bl 1) is provided for actuating at least one operating function of the HMI unit (BIO).

31. A hand-held tool with an HMI unit according to any one of claims 11 to 30.

Images