Backpack-mounted blower

Abstract

Backpack-mounted blower (1), comprising at least three assemblies, - wherein the first assembly is a back carrying device (10), - wherein the second assembly is a blower unit (20) with a drive motor (3), - wherein the third assembly is a holder (30) for an energy storage device for supplying the drive motor (3) with energy, wherein the backpack device (10) has a front side (11) and a rear side (12), wherein at least the second assembly and the third assembly are arranged on the front side (11) of the backpack device (10), wherein the blower (1) comprises a fastening unit (40) with a plurality of screws (42) for connecting the assemblies to one another, wherein the fastening unit (40) has a released position (44) and a fastened position (45), characterized in that the fastening unit (40) is designed such that - that in the released position (44) of the fastening unit (40) all assemblies can be detached from one another without tools, - that in the fastened position (45) of the fastening unit (40) all assemblies are clamped together, and - that all screws (42) of the fastening unit (40) can be screwed into the assemblies via the rear side (12) of the back carrying device (10).

Description

[0001] The invention relates to a backpack blower according to the preamble of claim 1.

[0002] Blowers are known from the prior art which comprise a blower unit with a drive motor, a holder for an energy storage device for supplying the drive motor with energy and a back carrying device for carrying the blower.

[0003] A disadvantage of such blowers is their extremely complex assembly. Typically, the backpack device serves as the base platform to which all components are screwed one after the other. This sequential assembly process is very complex and time-consuming.

[0004] US 2023 / 0 200 310 A1 discloses a backpack-mounted blower comprising a backpack carrying device, a blower unit with an electric motor, and a mount for two battery packs. Parts of the mount for the two battery packs are screwed to the blower unit.

[0005] EP 4 202 126 A1 discloses a backpack-mounted blower comprising a backpack carrying device, a blower unit with an electric motor, and a holder for two battery packs. Both the holder for the battery packs and the blower unit are mounted on the backpack carrying device.

[0006] DE 20 2020 001 322 U1 discloses a backpack-mounted blower comprising a backpack carrying device, a blower unit with an electric motor, and a holder for two battery packs. The blower unit is arranged between the backpack carrying device and the holder for the battery packs. The holder for the battery packs is screwed to the backpack carrying device.

[0007] It is therefore an object of the invention to provide a blower of the generic type which can be assembled in a simple and quick manner.

[0008] This object is achieved by a blower having the features of claim 1.

[0009] The backpack-mounted blower according to the invention comprises at least three assemblies, the first assembly being a backpack device, the second assembly being a blower unit with a drive motor, and the third assembly being a holder for an energy storage device for supplying the drive motor with energy. The backpack device has a front side and a rear side, with at least the second assembly and the third assembly being arranged on the front side of the backpack device. The blower device comprises a fastening unit with a plurality of screws for connecting the assemblies to one another, the fastening unit having a released position and a fastened position, the fastening unit being designed such that - that in the released position of the fastening unit all assemblies can be detached from each other without tools, - that in the fixed position of the fastening unit all components are clamped together, and - that all screws of the fastening unit can be screwed into the assemblies via the back of the backpack device.

[0010] The three assemblies are pre-assembled into an assembly without tools. For this purpose, the blower unit and the bracket are arranged on the front of the backpack device. The at least three assemblies are fastened together. Several screws of the fastening unit are screwed into the at least three assemblies. This clamps the assemblies together. Since all screws of the fastening unit are screwed into the assemblies via the back of the backpack device, the fastening, i.e. the clamping, of the assemblies to one another takes place in a single assembly step. The screwing in of the several screws preferably takes place only via the back of the backpack device.

[0011] During pre-assembly of the components, the blower unit is preferably placed on a flat surface. The bracket for the energy storage unit is then placed on the blower unit. This is particularly advantageous because the bracket for the energy storage unit must be connected to the blower unit in such a way that the drive motor of the blower unit can be supplied with energy. Accordingly, the bracket for the energy storage unit is connected to the blower unit either by an electrical cable or a fuel line. Once the bracket is placed on the blower unit, both assemblies can be easily connected to one another using a corresponding cable. Due to the close arrangement, the cable can be kept short. The backpack device is then placed on the blower unit and the bracket.In this state of the blower, the fastening unit is in the released position. The at least three components are pre-assembled without tools. Disassembly of the blower into the at least three components can also be carried out without tools in this state. Finally, the multiple screws of the fastening unit are to be screwed through the backpack device, in particular via the back of the backpack device, into the holder of the energy storage unit and / or into the blower unit. This clamps the at least three components together. The fastening unit is in the fastened position. Accordingly, the mutual fastening of the at least three components to one another takes place in a single assembly step. This not only simplifies the assembly of the blower, but also makes it considerably faster than with prior art blowers.

[0012] It is advantageous that all screws of the fastening unit each have a longitudinal center axis, whereby the longitudinal center axes of the screws point in the same direction when the fastening unit is in the fastened position. When the screws of the fastening unit are screwed into the backpack device, the longitudinal center axes of the screws run parallel to one another. This enables simple automation of the assembly step. Automated screwing devices in assembly lines are often designed as simple 3-axis machines. Pivoting the screwing tool of such a screwing device is then not possible. Due to the parallel arrangement of all screws of the fastening unit, all screws can also be screwed into the backpack device using such a screwing device. Manual rework is therefore not necessary.

[0013] In particular, it is provided that the fastening unit has a plurality of first screw connections that serve to connect only two assemblies to one another. For example, first screw connections can be provided for connecting the backpack device and the holder for the energy storage device, or for connecting the backpack device and the blower unit. The first screws for connecting only the holder and the blower unit are not provided, as these cannot be screwed together via the backpack device.

[0014] It is advantageous for the fastening unit to have a plurality of second screw connections that serve to connect at least three assemblies to one another. Second screw connections thus serve, for example, to connect the backpack device, the blower unit, and the bracket for the energy storage device.

[0015] The blower unit preferably comprises anti-vibration elements, wherein the anti-vibration elements are part of the first screw connections and / or part of the second screw connections. The anti-vibration elements serve to decouple vibrations from the blower unit and the backpack device. Thus, the vibrations emanating from the blower unit are not transmitted to the operator, thereby increasing the wearing comfort of the blower.

[0016] The energy storage device is, in particular, a battery pack, and the holder is preferably designed as a battery pack receptacle, in particular two battery pack receptacles. In such an embodiment, the drive motor is designed as an electric motor. In an alternative embodiment of the blower, the drive motor can also be designed as an internal combustion engine. In such an alternative embodiment, the energy storage device corresponds to the fuel for the drive motor, and the holder corresponds to the fuel tank.

[0017] In particular, it is provided that the blower comprises a cover for cladding the holder, wherein the cover can be attached to the holder by means of a fastening that can be operated without tools, wherein the fastening is designed in particular as a snap-in connection. The fastening is designed to center the cover on the holder for the energy storage device. During assembly of the blower, the cover is placed on the holder. The holder and cover snap together without tools. This ensures that the cover is secured to the holder even when the blower is not yet fastened. If the fitter moves the components of the blower during assembly, a secure hold of the cover on the holder for the energy storage device is ensured. This simplifies handling of the components during assembly. The cover preferably covers part of the spiral and part of the backpack device.

[0018] Further features of the invention will become apparent from the drawing, which shows a detailed embodiment of the invention. It shows: Fig. 1 shows a perspective view of the blower according to the invention, Fig. 2 in perspective view the blower according to Fig. 1 without intake grille, Fig. 3 in perspective sectional view the blower unit of the blower according to Fig. 1, Fig. 4 in perspective view the blower according to Fig. 1 in assembled condition and in the fixed position of the fastening unit, Fig. 5 in perspective view the blower according to Fig. 1 with the backpack device removed and the bracket attached to the blower unit, Fig. 6 in perspective view the blower according to Fig. 1 in disassembled condition, Fig. 7 in perspective view the blower unit with attached bracket and pre-assembled cover, Fig. 8 in side view the blower according to Fig. 1 and Fig. 9 in a side, partial sectional view of the blower according to Fig. 1.

[0019] In Fig. 1 shows a backpack-mounted blower 1 according to the invention. Alternatively, the blower can also be designed as a suction / blowing device. In such an embodiment, the working device 1 comprises two operating modes, namely a suction mode and a blowing mode, in which it can be operated. The term "backpack-mounted" is to be understood as meaning that the working device is carried on the operator's back during its intended operation.

[0020] As in Fig. 1, the blower 1 comprises a housing 2. The blower 1 also comprises a drive motor 3 arranged in the housing 2. The blower 1 comprises a blower unit 20. The blower unit 20 comprises a spiral housing 21 and an impeller 22. The impeller 22 can be driven to rotate about an axis of rotation 23 by means of the drive motor 3. The impeller 22 is rotatably mounted relative to the housing 2. The drive motor 3 is part of the blower unit 20. In the exemplary embodiment, the drive motor 3 is designed as an electric motor. The electric motor is supplied with electrical energy in particular by at least one first battery pack 33, preferably by a first battery pack 33 and a second battery pack 33'. The two battery packs 33, 33' are each guided in a battery compartment 32 open towards the outside of the housing, so that the battery packs 33, 33' can be replaced without opening the housing 2.Alternatively, it can also be provided that the drive motor 3 is designed as an internal combustion engine, in particular as a two-stroke engine or as a mixture-lubricated four-stroke engine.

[0021] As in the Fig. 1 and Fig. 2, the working device 1 comprises a handle 56. At least one actuating element 57 is assigned to the handle 56 to control the drive motor 3. In the present embodiment of the working device 1, the actuating element 57 is arranged on the handle 56. The actuating element 57 is designed as an actuating lever. The handle 56 comprises further actuating elements 58, 58' which serve, for example, to release the drive motor 3, to set continuous throttle, corresponding operating modes for adjusting the power, the speed, etc. Furthermore, the handle 56 comprises a display 59 for transmitting information to the operator.

[0022] As in the Fig. 1 and Fig. As shown in Figure 2, the implement 1 comprises a back carrying device 10. The back carrying device 10 comprises a carrying frame 13 and a carrying strap system (not shown in detail). In the exemplary embodiment, padding 14 for the shoulder straps and hip belts, as well as back padding, are provided on the carrying frame 13.

[0023] As in Fig. As shown in Figure 2, during operation of the working device 1, the blower unit 20 draws in air through an intake opening 25 and expels it through an exhaust opening 26. An air stream 27 flows from an external environment 6 of the blower 1 into an interior space 7 of the housing 2 toward the blower unit 10. In the exemplary embodiment, the blower unit 10 is designed as a radial fan. The air stream 27 is therefore redirected by the blower unit 20 from the intake opening 25 via the spiral housing 21 to the exhaust opening 26.

[0024] As in the Fig. 1 and Fig. 2, the working device 1 comprises a blower pipe 60. The blower pipe 60 connects to the blow-out opening 26 of the housing 2, in particular of the spiral housing 21. The blower pipe 60 comprises a connecting piece 61, an elastic pipe section 62, an intermediate piece 63, and an end piece 64. The connecting piece 61 is arranged, in particular fastened, to the blow-out opening 26 of the housing 2, in particular of the spiral housing 21. The connecting piece 61 is curved in such a way that the remainder of the blower pipe 60 is directed forwards, starting from an operator (not shown) who carries the blower 1. The pipe section 62 connected to the connecting piece 61 is elastic, so that the operator of the working device 1 can easily pivot the blower pipe 60 in order to be able to direct the air flow 27 specifically onto the material to be blown. In the exemplary embodiment, the elastic tube section 62 is designed as a bellows.The intermediate piece 63 is connected to the elastic tube section 62. The intermediate piece 63 is preferably rigid. The handle 56 is preferably attached to the blowpipe 60. The blowpipe 60 can be pivoted via the handle 56. For this purpose, the handle 56 is particularly preferably attached to the rigid intermediate piece 63. The end piece 64 is mounted on the intermediate piece 63. The end piece 64 tapers conically. Accordingly, the end piece 64 is nozzle-shaped. The individual components of the blowpipe 60 are connected to one another via clamps, plug connections, and / or screw connections.

[0025] As in Fig. 3, the drive motor 3 is arranged in a motor housing 65. The motor housing 65 is part of the housing 2. The drive motor 3 comprises a drive shaft 66. In the exemplary embodiment, the drive shaft 66 is designed as a rotor 67 of the electric motor. The electric motor also comprises a stator 68 which is firmly connected to the motor housing 65. The electric motor is designed as an external rotor. In an alternative embodiment, the electric motor can also be designed as an internal rotor. The impeller 22 is fastened to one end of the drive shaft 66. The drive shaft 66 has an axis of rotation which corresponds to the axis of rotation 23 of the impeller 22. The impeller 22 is clamped onto the drive shaft 66 of the drive motor 3 by means of a central screw 69. The impeller 22 is fastened to the drive shaft 3 only by means of the one central screw 69.No further fastening means are required, thus ensuring simple and quick fastening of the impeller 22 to the drive shaft 3.

[0026] As in Fig. 3, the impeller 22 is surrounded by a spiral 70 radially relative to the rotational axis 23. The spiral 70 is formed from the motor housing 65 and the spiral housing 21. As is known, a plurality of fan blades 71 are formed on the impeller 22. During operation of the working device 1, as the impeller 22 rotates, air is sucked in through the impeller 22 via the intake opening 25. The air is conveyed radially outward into the spiral 70 via the fan blades 71. This creates the previously described air flow 27, which flows from the intake opening 20 via the impeller 22 into the spiral 70. The air flow 27 then flows through the outlet opening 26 into the blowpipe 60 and through the end piece 64 of the blowpipe 60 back into the outside environment 6.

[0027] As in Fig. 3, during operation of the blower 1, the rotation of the impeller 22 creates a negative pressure in the intake area, i.e., in the area of the intake opening 25. In contrast, an overpressure develops in the spiral 70. Accordingly, during operation of the blower 1, a negative pressure zone 72 develops in the area of the intake opening 25 and an overpressure zone 73 develops in the spiral 70. The overpressure created in the spiral 70 should be used as fully as possible to blow air out of the blower tube 60. The overpressure zone 73 should be sealed as well as possible from the negative pressure zone 72 so that leakage currents can be minimized or even completely avoided. A seal is therefore provided between the spiral housing 21 and the impeller 22. Since the impeller 22 is relatively movable relative to the spiral housing 21, a contact-free seal is required. Therefore, the blower unit 20 in this case comprises a gap seal 74.The gap seal 74 is formed between the spiral casing 21 and the impeller 22.

[0028] In the Fig. 4 and Fig. 5, the blower 1 is shown without parts of the blower tube 60 and without the cushion 14. The blower 1 comprises at least three assemblies. The first assembly is the backpack device 10. The second assembly is the blower unit 20. The third assembly is a holder 30 for the energy storage device for supplying the drive motor 3 with energy ( Fig. 5). In the present embodiment of the blower 1, the drive motor 3 is designed as an electric motor. Therefore, the holder 30 for the energy storage device is a battery pack holder 31, which is provided for receiving at least one battery pack 33, preferably for receiving two battery packs 33, 33' ( Fig. 1). The battery pack holder 31 includes the battery compartments 32, 32'. The battery packs 33, 33' correspond to the energy storage device. In the alternative embodiment, in which the drive motor 3 is an internal combustion engine, the holder 30 for an energy storage device is the fuel tank. The energy storage device itself is the fuel contained in the fuel tank.

[0029] As in Fig. As shown in Figure 5, the blower 1 comprises a fastening unit 40. The fastening unit 40 comprises several screws 42 for connecting the assemblies to one another. The fastening unit 40 has a released position 44 and a fastened position 45 ( Fig. 4). In the present embodiment, the fastening unit 40 is formed from the screws 42. The fastening unit 40 is designed such that, in the released position 44 of the fastening unit 40, all assemblies can be detached from one another without tools. In the released position 44 of the fastening unit 40, all screws 42 are loosened. The fastening unit 40 is designed such that, in the fastened position 45 of the fastening unit 40, all assemblies are clamped together. In the fastened position 45 of the fastening unit 40, all screws 42 are tightened. Furthermore, the fastening unit 40 is designed such that all screws 42 of the fastening unit 40 can be screwed into the assemblies via a rear side 12 of the backpack device 10. The backpack device 10 comprises a rear side 12 and a front side 11 facing away from the rear side 12.All components, such as the blower unit 20 or the holder 30 for an energy storage device, are arranged on the front side 11.

[0030] As in Fig. 5, the plurality of screws 42 each have a longitudinal center axis 46. In the fastened position of the fastening unit 40, all of the plurality of screws 42 are arranged relative to one another such that their longitudinal center axes 46 point in the same direction. Accordingly, in the fastened position of the fastening unit 40, all of the plurality of screws 42 are arranged relative to one another such that their longitudinal center axes 46 are aligned parallel to one another. This arrangement of the screws 42 relative to one another makes it possible to screw the screws 42 of the fastening unit 40 into the assemblies in an automated manner, for example using a 3-axis machining center.

[0031] As in Fig. 5, the screws 42 are part of a screw connection 47, 48 of the fastening unit 40. The screw connections 47, 48 of the fastening unit 40 can be divided into a plurality of first screw connections 47 and a plurality of second screw connections 48. The plurality of first screw connections 47 are intended for connecting only two assemblies. The plurality of second screw connections 48 are intended for connecting at least three assemblies. As shown in Fig. 5, a plurality of first screw connections 47 are provided for connecting the backpack device 10 and the blower unit 20. Furthermore, a plurality of first screw connections 47 are provided for connecting the backpack device 10 and the holder 30. In the preferred embodiment of the blower device 1, a plurality of second screw connections 48 are provided for connecting the backpack device 10, the blower unit 20, and the holder 30. Furthermore, a plurality of second screw connections 48 are provided for connecting the backpack device 10, the holder 30, and a cover 34. The cover 34 is part of the housing 2 and delimits the interior space 7, particularly in the region of the holder 30. The cover 34 forms a fourth assembly.

[0032] As in the Fig. 6 and Fig. 7, the blower 1 comprises a plurality of anti-vibration elements 49. The anti-vibration elements 49 are part of the blower unit 20. The anti-vibration element 49 comprises a coil spring, one end of which is attached to a dome 50 formed on the blower unit 20. The anti-vibration elements 49 are firmly connected to the dome 50. The domes 50 are formed in particular on the motor housing 65 of the blower unit 20. At the other end of the coil spring, a thread 43 is provided for the screw 42. The thread 43 is formed in a pin 80 of the anti-vibration element 49, wherein the pin 80 is held at the other end of the coil spring. The blower unit 20 is connected to the backpack device 10 by the anti-vibration elements 49. The anti-vibration elements 49 are part of several first screw connections 47 and / or several second screw connections 48.The anti-vibration elements 49 can reduce or even prevent the mutual transmission of vibrations between the blower unit 20 and the backpack device 10. In the exemplary embodiment, four anti-vibration elements 49 are provided for connecting the blower unit 20 to the backpack device 10.

[0033] As in the Fig. 8 and Fig. 9, a screw connection 47, 48 comprises a screw 42 and a thread 43 formed in an assembly. In selected screw connections 47, 48, the thread 43 for the screw 42 is provided in the anti-vibration element 49. In such screw connections, the anti-vibration element 49 forms part of the screw connection 47, 48. In other screw connections 47, 48, the threads 43 are preferably provided in a dome 50' formed on the housing 2. Such domes 50' are preferably formed on the holder 30, in particular exclusively on the holder 30. In such screw connections 47, 48, the anti-vibration elements 49 are not part of the screw connection 47, 48.

[0034] When the blower 1 is assembled, the screws 42 extend through a corresponding opening 15 of the backpack device 10 and engage the thread 43 of the dome 50'. Thus, the backpack device 10 as the first assembly and the blower unit 20 as the second assembly are secured to one another by a plurality of first screw connections 47.

[0035] As in Fig. 6, the holder 30 comprises at least one receptacle 37, in particular two receptacles 37 ( Fig. 7), which are intended to rest on the anti-vibration element 49. The receptacles 37 are hat-shaped and, when the blower 1 is assembled, encompass the anti-vibration element 49. With such second screw connections 48, the screw 42 projects through the opening 15 of the backpack device 10, through the receptacle 37 of the holder 30, into the thread 43 of the pin 80 of the anti-vibration element 49. By means of this second screw connection 48, the backpack device 10 as the first assembly, the holder 30 as the third assembly, and the blower unit 20 as the second assembly are connected to one another.

[0036] As in Fig. 6, the cover 34 is arranged on the holder 30. The cover 34 forms a covering for the holder 30. The cover 34 is thus part of the housing 2 of the blower 1. The cover 34 can be fastened to the holder 30 by means of a fastening 35 that can be operated without tools. The fastening 35 is preferably designed as a snap-in connection 51. As shown in Fig. 6, a centering section 36 is formed on the inside of the cover 34. The centering section 36 aligns the cover 34 with respect to the holder 30. The centering section 36 is formed from a projection 52 formed on the inside of the cover 34 with a U-shaped recess 53. Two legs 54 are formed on the projection 52 by the recess 53 on the projection 52. When the cover 34 is fastened to the holder 30, the cover is arranged with the centering section 36 relative to the holder 30 in such a way that the legs 54 of the fastening 35 encompass a contour 55, in particular a screw dome, of the holder 30 ( Fig. 9). Furthermore, the fastening 35 of the cover 34 comprises a tab 38 which rests on the contour 55. The tab 38 has an opening 39 through which the screw 42 protrudes in the fastened position 45 of the fastening device 40. Due to the tab 38 of the cover 34 resting on the contour 55 of the holder 30, the cover 34 is aligned in the direction of the longitudinal center axis 46 of the screws 42. Since the legs 54 encompass the contour 55 of the holder 30 and thus also the longitudinal center axis 46 of the screws 42, securing the cover 34 on the holder 30 transversely to the longitudinal center axis 46 of the screws 42 is ensured.

[0037] As in the Fig. 8 and Fig. 9, the holder 30 comprises a retaining contour 75, which forms the locking connection 51 with the tab 38 of the cover 34. Once the locking connection 51 is engaged, the retaining contour 75 of the holder 30 engages in the opening 39 of the tab 38 of the cover 34. When attaching the cover 34, it is first pushed onto the holder 30 until the retaining contour 75 of the holder 30 engages in the opening 39 of the tab 38 of the cover 34. The backpack device 10 is then arranged on the blower unit 20, the holder 30, and the cover 34. Finally, the screws 42 are screwed into the assemblies. A screw 42 of the fastening device 40 projects through the opening 39 of the tab 38 of the cover 34. The tab 38 of the cover 34 is held clamped between the backpack device 10 and the holder 30 when the screw 42 is tightened.

[0038] As in the Fig. 8 and Fig.9, the holder 30 comprises a first housing part 76 and a second housing part 77. The first housing part 76 faces the fan 20. The second housing part 77 faces the backpack device 10. The individual housing parts 76, 77 of the holder 30 are also screwed together using the screws 42. The first housing part 76 has a plurality of screw bosses 78. Threads 43 for engagement with the screws 42 are provided in the screw bosses 78. The threads 43 in the screw bosses 78 can also be formed by self-tapping screws. Corresponding mating contours 79 are formed on the second housing part 77. Each mating contour 79 of the second housing part 77 engages around a screw boss 78 of the first housing part 76, whereby the first housing part 76 and the second housing part 77 are fixed to one another in a form-fitting manner.Due to the positive connection of the two housing parts 76, 77 with each other, a simple arrangement of the housing parts 76, 77 and the various assemblies is possible.

[0039] The assembly process of the backpack blower 1 is described in more detail below: The various assemblies are to be arranged in an assembly. For this purpose, the second assembly, namely the blower unit 20, is to be placed on a base 8 that is as flat as possible. The front side 28 of the blower unit 20, facing away from the backpack device 10, faces the base 8. The rear side 29 of the blower unit 20 is directed "upward" in this position of the blower unit 20. Anti-vibration elements 49 are arranged, in particular screwed, onto the domes 50 of the blower unit 20. For this purpose, a negative contour is provided on the domes 50 for engagement by the anti-vibration element 49. In the present embodiment, four anti-vibration elements 49 are provided. A different number of anti-vibration elements 49 may also be expedient. The holder 30 is then arranged on the blower unit 20. The two receptacles 37 of the holder 30 overlap two anti-vibration elements 49. The first housing part 76 faces the fan 20.By resting the first housing part 76 on the anti-vibration elements 49, a vibration gap is formed between the fan 20 and the first housing part 76. The receptacles 37 of the holder 30 are formed on the second housing part 77. The cover 34 is fastened to the holder 30. The tab 38 of the cover 34 is pushed onto the holder 30 until the retaining contour 75 of the holder 30 snaps into the opening 39 of the tab 38 of the cover 34. The cover 34 can be fastened to the holder 30 without tools via the snap-in connection 51. The cover 34 is centered relative to the holder 30 via the fastening 35.This arrangement of the blower unit 20, the bracket 30, and in particular the cover 34 in a pre-assembled state without the backpack device 10 allows the installer to easily perform further assembly steps of the blower device 1, such as the electrical connection of the drive motor 3 to the bracket 30 in order to supply it with electrical energy from the energy storage device during operation. The snap-in connection 51 between the cover 34 and the bracket 30, as well as the support of the receptacle 37 of the bracket 30 on the anti-vibration elements 49, hold the assemblies sufficiently firmly to one another so that any detachment of the assemblies from one another can be ruled out during corresponding further assembly steps. In this pre-assembled arrangement, the anti-vibration elements 49 serve as a connecting element between the blower unit 20 and the bracket 30.Finally, the backpack device 10 is positioned on the blower unit 20, on the bracket 30, and on the cover 34. The front side 11 of the backpack device 10 faces the other assemblies. The backpack device 10 is aligned with the other assemblies via the anti-vibration elements 49, the cover 34, and the screw points of the bracket 30. Finally, all screws 42 are screwed into the assemblies. The longitudinal center axes 46 of the screws 42 all point in the same direction. All screws 42 are screwed in via the rear side 12 of the backpack device 10, i.e., the side of the backpack device 10 facing away from the assemblies. The screws 42 form the fastening device 40. Once the screws 42 are tightened, the assemblies are clamped together. The fastening unit 40 is then in the fastened position 45.In the present embodiment, the fastening unit 40 comprises 10 screws 42. In an alternative embodiment, more or fewer screws 42 may be appropriate.

Claims

[1] Backpack-mounted blower (1), comprising at least three assemblies, - wherein the first assembly is a back carrying device (10), - wherein the second assembly is a blower unit (20) with a drive motor (3), - wherein the third assembly is a holder (30) for an energy storage device for supplying the drive motor (3) with energy, wherein the backpack device (10) has a front side (11) and a rear side (12), wherein at least the second assembly and the third assembly are arranged on the front side (11) of the backpack device (10), wherein the blower device (1) comprises a fastening unit (40) with a plurality of screws (42) for connecting the assemblies to one another, wherein the fastening unit (40) has a released position (44) and a fastened position (45), characterized by that the fastening unit (40) is designed such that - that in the released position (44) of the fastening unit (40) all assemblies can be detached from one another without tools, - that in the fastened position (45) of the fastening unit (40) all assemblies are clamped together, and - that all screws (42) of the fastening unit (40) can be screwed into the assemblies via the rear side (12) of the back carrying device (10). [2] Blower (1) according to claim 1, characterized by that all screws (42) each have a longitudinal center axis (46), wherein the longitudinal center axes (46) of the screws (42) have the same direction. [3] Blower (1) according to claim 1 or 2, characterized by that the fastening unit (40) has a plurality of first screw connections (47) which serve to connect only two assemblies to one another. [4] Blower (1) according to one of claims 1 to 3, characterized bythat the fastening unit (40) has a plurality of second screw connections (48) which serve to connect at least three assemblies to one another. [5] Blower (1) according to claim 3 or 4, characterized by that the blower unit (20) comprises anti-vibration elements (49), wherein the anti-vibration elements (49) are part of the first screw connections (47) and / or the second screw connections (48). [6] Blower (1) according to one of claims 1 to 5, characterized by that the energy storage device is a battery pack (33) and the holder (30) is designed as a battery pack receptacle (31, 31'), in particular two battery pack receptacles (31, 31'). [7] Blower (1) according to one of claims 1 to 6, characterized byin that the blower (1) comprises a cover (34) for covering the holder (30), wherein the cover (34) can be fastened to the holder (30) by means of a fastening (35) which can be actuated without tools, wherein the fastening (35) is designed in particular as a snap-in connection (51).

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