Backpack blower

Abstract

The invention relates to a back-carryable blowpipe device, comprising a back frame with a supporting frame, a blowpipe with a supporting side tube section held at the back side of the supporting frame and a hand side tube section extending through a first side region of the supporting frame, a drive motor, an energy source for the drive motor and an axial blower driven by the drive motor, which is arranged in the supporting side tube section of the blowpipe. According to the invention, the supporting side tube section of the blowpipe extends with a main directional component in the supporting transverse direction of the supporting frame and has an axial blowpipe end portion, which laterally projects beyond a second side region of the supporting frame, which faces away from the first side region and / or which is at least on a partial circumferential side surrounded by a protection ring element connected to the supporting frame. The use, for example, for an electric blowpipe device.

Description

TECHNICAL FIELD

[0001] The invention relates to a back-carrying blow device, comprising a back frame with a supporting frame, a blow tube with a supporting side tube section held at the back side of the supporting frame and a hand side tube section extending through a first side region of the supporting frame, a drive motor, an energy source for the drive motor and an axial flow blower driven by the drive motor, which has an axial blower axis and is arranged in the supporting side tube section of the blow tube. BACKGROUND

[0002] Such a blow device is carried on the back of a user in operation. For this purpose, the back frame usually has a carrying strap or shoulder strap, which is fixed at the supporting frame and with which the user carries the back frame with the supporting frame according to the form of a backpack and thus can be carried on the back. The supporting side tube section and the hand side tube section are currently to be understood as the tube section which is associated with the supporting frame, that is to say in the surroundings thereof, or the tube section which is on the hand side of the user. In use, the user can thus hold or operate the blow tube with one or two hands at the hand side tube section. At the supporting frame there are the main further components of the blow device, in particular the supporting side tube section with the axial flow blower, the drive motor for driving the axial flow blower and the energy source for the drive motor.

[0003] Blow devices of this form and similar forms are used as blow-out blow devices, in particular as blow leaf devices, usually also called blow leafers, and as suction blow devices, for example as back-carrying vacuum cleaners. In the case of a blow-out blow device, the supporting side tube section constitutes the air inflow side tube section, that is to say the section of the blow tube in which there is an inlet for the blow medium to be guided in the blow tube, while the hand side tube section constitutes the air outflow side tube section, that is to say the section of the blow tube in which there is an outlet for the blow medium. In the case of a suction blow device, in contrast, the hand side tube section constitutes the air inflow side tube section, while the supporting side tube section constitutes the air outflow side tube section. For easier understanding, reference is currently made to the concepts for a blow-out type blow device. These concepts are to be understood correspondingly modified for a suction type blow device, that is to say the air inflow side is thus the air outflow side, the air inflow channel is the air outflow channel, etc. Usually, the blow medium is air, in special cases however it can also be other blow media, wherein the concepts currently referred to for simplicity, for example air inflow side, air outflow side, air inflow channel, etc. are to be understood in the general sense, which also include these other cases in which the blow medium is not air.

[0004] For such hairdryer devices, embodiments with an internal combustion engine as hairdryer drive motor and a gasoline tank as an attached energy source and embodiments with an electric motor as hairdryer drive motor and a battery pack as an attached energy source are common, wherein the term battery pack is to be understood in a general sense for representing any conventional form of battery.

[0005] If present terms of orientation such as top side, bottom side, front side, back side, vertical direction and horizontal direction and the like are used for the hairdryer device and more particularly for the backrest or support frame, these terms of orientation are directed to the hairdryer device in its support position on the back of a user. The top side is then the side which is in the vertical upper part, the bottom side is the side which is in the vertical lower part, the longitudinal sides of the hairdryer device or backrest extend laterally to the left and to the right in a generally vertical direction, the transverse sides of the hairdryer device or backrest extend generally horizontally transversely to the upper and lower part, the front side is the side which faces the user in the support position, the back side is the side of the hairdryer device or backrest which faces away from the user in the support position, and the direction from the front side to the back side or from the back side to the front side is called the front-rear direction.

[0006] A hairdryer device of the previously mentioned form is disclosed in the publication EP 3 225 098 A1 in an embodiment as a hairdryer device of the blow-out type. An electric motor and an axial hairdryer are integrated into a common hairdryer body with a common axial motor / hairdryer axis, which is arranged in a support-side tube section with an axial hairdryer axis parallel to the longitudinal direction of the tube section, wherein preferably two hairdryer tubes are provided, which for operation by the user with both hands extend with their hand-side tube sections past the left or right side area of the support frame. The respective support-side tube section is arranged at the support frame in such a way that its longitudinal axis and thus the hairdryer axis of the axial hairdryer integrated therein extends parallel to the back side of the backrest or support frame. Instead of the support-side tube section being arranged approximately vertically at the left or right side of the support frame or backrest next to the battery pack held at the back side of the support frame, it is suggested that the respective support-side tube section is positioned below the battery pack at the back side of the support frame with a horizontal course of the hairdryer axis or a course inclined with respect to the horizontal and vertical lines. Here, the respective support-side tube section extends along the back side of the support frame in the direction to the oppositely located side area and is interrupted at a distance in front of the end region of the axial hairdryer tube which tapers conically towards the axial hairdryer end (Blasrohr-Endabschluss) as air inlet.

[0007] The publication EP 2 684 446 A2 discloses a back-carried leaf-blowing device with a radial-flow blower which, together with an attached drive motor, is held at a support frame of a back frame in such a way that the common drive shaft of the motor and the radial-flow blower extends at an acute angle of approximately 5° to approximately 35° to the vertical main direction component in a support frame plane in which the support frame substantially lies, wherein the drive shaft intersects the support frame plane at a point close to the top side of the support frame.

[0008] The publication US 2016 / 0208449 A1 discloses a back-carried electric blower device in which a battery pack is held at a support frame of a back frame, while a axial-flow blower and an attached electric drive motor are arranged in a hand-guided blowing tube which is connected via a flexible support connection and an electric cable to the back-carried battery pack.

[0009] The publication EP 3 682 730 A1 discloses a blower unit for a portable, hand-guided blowing device with a tubular housing section in which an axial-flow blower together with an attached drive motor is accommodated, wherein an air deflector is arranged before the suction opening at an axial distance, the outer dimensions of which are greater than the outer dimensions of the suction opening. Between the air deflector and the outer edge of the housing section an annular suction gap is configured which is provided with an air inflow grille or a protection grille, from which an air transport channel continues which is limited radially outward by the tube wall of the housing section and radially inward by an air guide cone which is coupled to the air deflector towards the suction opening. SUMMARY

[0010] As a technical problem, the present invention is based on the provision of a back-carried blowing device of the previously mentioned form which offers advantages in particular with regard to the arrangement of the tube section of the support side of the blowing tube at the support frame and / or with regard to the blowing medium guidance compared to the prior art mentioned above.

[0011] The present invention solves this problem by the provision of a back-carried blowing device according to the invention. Advantageous refinements of the invention which contribute to solving this problem and further problems are explained in other parts of the present disclosure, the content of which is therefore fully referred to the content of the specification.

[0012] According to the application, in the case of the blow dryer the pipe section of the support side of the blow pipe extends with a main directional component in the support transverse direction of the support frame and has an axial blow pipe end which laterally projects beyond the second side region of the support frame facing away from the first side region and / or is at least partially surrounded by a protection ring element connected to the support frame. Here, the support transverse direction is to be understood as the direction perpendicular to the front-rear direction and extending horizontally or approximately horizontally in the use position of the blow dryer on the back of the user.

[0013] In the case of this configuration of the blow dryer, the pipe section of the support side of the blow pipe thus extends with its longitudinal direction parallel to or at least predominantly in the support transverse direction of the support frame, that is to say with a greater directional component in this direction than in a direction perpendicular thereto, which is an advantageous prerequisite for a compact arrangement of the blow pipe section of the support side at the support frame of the back frame.

[0014] By having the pipe section of the support side laterally, that is to say transversely or in a lateral direction, project with its axial end region beyond the facing side region of the support frame, that is to say its left or right side region, in the relevant inventive aspect the pipe section of the support side can be arranged very compactly and space-savingly at the support frame if necessary, even when it has a conical widening in the direction pointing radially outwards in this axial end region, for example in the form of an air inlet funnel. In particular, the pipe section of the support side does not necessarily have to be accommodated behind the support frame and / or behind other blow dryer components held at the support frame with the full cross section or diameter of its conically widened end region. Rather, the optionally conically widened end region can be arranged overlapping the support frame and / or other blow dryer components held there in the depth direction of the back frame, that is to say in the front-rear direction.

[0015] By having the axial blow pipe end of the pipe section of the support side surrounded by a protection ring element connected to the support frame, more precisely at least along a portion of the entire circumference of the blow pipe end, the blow pipe end can be protected against external damaging influences by the at least partial surrounding protection ring element. In particular, the protection ring element can provide impact protection or drop protection for the blow pipe end against external impacts, which can be caused, for example, when the support frame or the back frame is inadvertently dropped onto the floor or is left by the user on the floor or the user inadvertently collides with a solid obstacle with the blow dryer supported on the back by it.

[0016] In an embodiment of the application, the blower axis is enclosed with the vertical support transverse plane of the support frame in a horizontal angle of between 1° and 30°. Here, the vertical support transverse plane is to be understood as such vertical plane which is perpendicular to the front-rear direction of the backrest or support frame, in which the support frame is mainly located. In this case, the blower axis and thus generally also the support-side tube section of the blowpipe is correspondingly inclined in the longitudinal direction of the blower axis / support-side tube section of the blowpipe in the horizontal plane to the vertical support transverse plane of the support frame and thus to the support transverse direction thereof which extends in the horizontal plane. This can contribute to an optimal positioning of the support-side blowpipe section and to an optimal blow medium guidance in the support-side blowpipe section. Furthermore, by this inclined position of the blower axis with respect to the support frame the protection ring element can correspondingly protrude with its side facing the support frame at the associated support frame side and in the case where the backrest with its side, that is to say its left or right side, is to be brought to rest on the ground, provide an impact protection as far as possible in such a way that it in particular takes up occurring impact forces with this protruding section and further conducts them to the support frame. In an alternative embodiment, the blower axis extends parallel to the support transverse direction of the support frame or only encloses a slight angle of less than 1° therewith, or the support-side blowpipe section is arranged at the support frame with a greater inclination so that the blower axis encloses a horizontal angle of more than 30° with the support transverse direction of the support frame.

[0017] In an embodiment of the application, the horizontal angle is in particular in the range between 2° and 15° or more particularly between 2° and 3°. The thus defined inclination of the blower axis and thus also of the support-side blowpipe section with respect to the support transverse direction of the support frame can be particularly advantageous for certain blow device embodiments, in particular in terms of optimal positioning and / or optimal impact protection or drop protection.

[0018] In an embodiment of the application, the blower axis is enclosed with the vertical support transverse plane of the support frame in a horizontal angle of between 1° and 30°. Here, the vertical support transverse plane is to be understood as such vertical plane which is perpendicular to the front-rear direction of the backrest or support frame, in which the support frame is mainly located. In this case, the blower axis and thus generally also the support-side tube section of the blowpipe is correspondingly inclined in the longitudinal direction of the blower axis / support-side tube section of the blowpipe in the horizontal plane to the vertical support transverse plane of the support frame and thus to the support transverse direction thereof which extends in the horizontal plane. This can contribute to an optimal positioning of the support-side blowpipe section and to an optimal blow medium guidance in the support-side blowpipe section. Furthermore, by this inclined position of the blower axis with respect to the support frame the protection ring element can correspondingly protrude with its side facing the support frame at the associated support frame side and in the case where the backrest with its side, that is to say its left or right side, is to be brought to rest on the ground, provide an impact protection as far as possible in such a way that it in particular takes up occurring impact forces with this protruding section and further conducts them to the support frame. In an alternative embodiment, the blower axis extends parallel to the support transverse direction of the support frame or only encloses a slight angle of less than 1° therewith, or the support-side blowpipe section is arranged at the support frame with a greater inclination so that the blower axis encloses a horizontal angle of more than 30° with the support transverse direction of the support frame.

[0019] In one design of the application, the vertical angle is at most 10°. In this configuration, the hair dryer axis or the support-side hair tube section thus extends horizontally or as horizontally as possible over the user's back in the use position of the hair blowing device, which proves to be optimal for many applications.

[0020] In one refinement of the application, the support-side tube section has a curved section from a hard tube material with a bending angle of less than 90°. The selection of the hard tube material for the curved section of the support-side hair tube section contributes to a good stability of this tube section in the curved region, which tube section can for example constitute the transition to the hand-side tube section. By means of the smaller bending angle than 90°, a tube bend of less than a vertical angle bend and thus a deflection of the blown gas medium guided therethrough is derived for the curved section, which can be advantageous in the case of the respective application for the tube guidance and the guidance of the blown gas medium in the hair tube. Advantageously, the bending angle can be coordinated to a certain inclined position of the hair dryer axis with respect to the support transverse direction of the support frame, if necessary, such that the curved section is approximately parallel to the fore-aft direction in the direction of the hand-side hair tube section. In alternative embodiments, the curved section is composed of a curved soft tube material and / or with a bending angle of 90° or more.

[0021] In one design of the application, the bending angle is in particular in the range between 60° and 85°. This is an optimal bending for the support-side hair tube section for certain hair blowing device applications.

[0022] In one refinement of the application, the drive motor is an electric motor and the energy source comprises a battery pack held at the support frame. In this configuration, the hair blowing device thus constitutes an electric hair blowing device. In alternative embodiments, the hair blowing device can for example comprise an internal combustion engine as drive motor and a gasoline tank as energy source.

[0023] In one refinement of the application, the drive motor has a motor axis parallel to the hair dryer axis and / or is arranged in the support-side tube section. This configuration provides an advantageous prerequisite for a compact arrangement of the drive motor and the axial hair dryer, for example as an integrated motor / hair dryer structural unit, in the support-side hair tube section. In alternative embodiments, the drive motor is arranged with a motor axis not parallel to the hair dryer axis and / or outside the support-side tube section of the hair tube.

[0024] In one design of the application, the drive motor and the axial blower are arranged in the region of the support-side tube section which constitutes the housing. This achieves a favourable integration of the drive motor and the axial blower in a common housing which in this case simultaneously serves as part of the support-side blow pipe section via which the support-side blow pipe section can be held at the support frame for many application cases. In an alternative embodiment, the drive motor and the axial blower are arranged in a common housing which is accommodated in the interior of the support-side blow pipe section.

[0025] In one refinement of the application, the support-side tube section is connected to the support frame by means of a sleeve-like holding element. To this end, the sleeve-like holding element can surround the support-side tube section, for example completely or alternatively on a portion of its circumference, preferably on more than half of its circumference. In an advantageous implementation, the holding element surrounds the support-side tube section in the region thereof which constitutes the housing and accommodates the drive motor and the axial blower. The holding element can be constituted as a component which is fastened at the support frame, for example in one piece or in multiple pieces, for example in the form of two half-shells, or alternatively as a component which is in one piece with the support frame, as required.

[0026] In one refinement of the application, the protection ring element is supported at the sleeve-like holding element and / or directly at the support frame. This can contribute to an enhanced impact resistance in such a way that the protection ring element can guide the impact forces acting out to the holding element which is therefore suitably impact-resistant implemented or can guide them directly to the support frame.

[0027] In one refinement of the application, the protection ring element surrounds the axial blow pipe terminal portion at a radial spacing and / or projects axially with an axial projection relative to the axial blow pipe terminal portion. In this case, the protection ring element can act as a radially and axially forward impact protection for the blow pipe terminal portion, so that the blow pipe terminal portion can be kept completely free from the impact forces acting.

[0028] In one design of the application, the axial tube wall end region of the support-side tube section is coaxially forward of a gas guide cone, wherein a radially annular air inflow opening is constituted. The gas guide cone constitutes a funnel-like axial outer delimitation of an associated air inflow channel which is thus radially open and constitutes the blow pipe terminal portion with an axial outer end. The support-side tube section of the blow pipe can optionally be correspondingly funnel- or conically shaped in its axial tube wall end region, alternatively however also axially cut off without conical expansion.

[0029] An air inlet grille composed of an elastically deformable material is arranged at the air inlet opening, wherein the air inlet grille non-contactingly surrounds the axial tube wall end region of the support-side tube section at a radial spacing at least partially circumferentially and is connected to the protection ring element on the one hand axially in front of the axial tube wall end region of the support-side tube section at an axially outer end and to the sleeve-like holder and / or support frame on the other hand axially behind the axial tube wall end region of the support-side tube section at an axially inner end.

[0030] This implementation makes it possible for the air inlet grille to be used as an impact-absorbing element in such a way that it elastically deforms under the impact action onto the more rigidly embodied protection ring element and thereby absorbs and conducts away the impact energy. The axial tube wall end region of the support-side tube section can remain unaffected by possible elastic deformations of the air inlet grille used in this way as an impact protection grille, since it has no mechanical contact with respect thereto. To this end, the radial spacing of the air inlet grille from the axial tube wall end region of the support-side tube section is expediently chosen to be at least as great as the spacing change of such an elastic deformation of the air inlet grille under impact action that is to be expected. Overall, this design of the invention is a very advantageous design in view of the air transport function and the impact protection.

[0031] In an improved embodiment of the invention, the protection ring element surrounds the axial blow pipe terminal end at least at the bottom face. Thus, the protection ring element can in particular be used as an impact protection against impact from below towards the blow pipe terminal end, as can occur for example in the case of the blow device being placed on the ground or in the case of the blow device falling unintentionally onto the ground.

[0032] In an embodiment of the invention, the protection ring element completely, that is to say approximately along its entire circumference, encloses the axial blow pipe terminal end, wherein, if necessary, a smaller circumferential range of several circumferential angles can remain free. This achieves a corresponding full protection of the blow pipe terminal end, for example, against impact action from any radial direction.

[0033] In an improved embodiment of the invention, the protection ring element comprises a ring holding section connected to the support frame and a protection section curvedly led out of the ring holding section, which surrounds the axial blow pipe terminal end over a circumferential angle of at least 180°. This is an advantageous design of the protection ring element in view of the structural link to the support frame and in view of the impact protection and impact force conduction for the axial blow pipe terminal end. BRIEF DESCRIPTION OF DRAWINGS

[0034] Advantageous embodiments of the application are shown in the drawings. These and further advantageous embodiments of the application are described below. Among others:

[0035] Figure 1 a perspective view from the rear left onto the back-carrying hairdryer device is shown,

[0036] Figure 2 a perspective view from the rear right onto the hairdryer device is shown,

[0037] Figure 3 a top view from the rear onto the hairdryer device is shown,

[0038] Figure 4 a top view from above onto the hairdryer device is shown,

[0039] Figure 5 a right side view onto the hairdryer device is shown,

[0040] Figure 6 a left side view onto the hairdryer device is shown,

[0041] Figure 7 a sectional view along the line VII-VII in Figure 3

[0042] Figure 8 a sectional view along the line VIII-VIII in Figure 4

[0043] Figure 9 a sectional view along the line IX-IX in Figure 4 DETAILED DESCRIPTION

[0044] As can be seen in the shown embodiment according to Figures 1 to 9 the back-carrying hairdryer device according to the application comprises a back frame 1, a blowpipe 4, a drive motor 2, an energy source 3 for the drive motor 2 and an axial blower 6 driven by the drive motor 2. The back frame 1 has a support frame 1 a, at the back side of which a support-side pipe section 4a of the blowpipe 4 is held. The support-side pipe section 4a is axially closed with an axial blowpipe end 9, as can be seen in particular from the sectional view in Figure 7 .

[0045] Furthermore, the blowpipe 4 comprises a hand-side pipe section 4b, which extends past a first side region S1 of the support frame 1 a, as can be seen for example from the perspective view in Figure 2 and 3 ​​​As can be discerned, the axial blower 6 has an axial blower axis 6a and is arranged in the support-side tube section 4a of the blow tube 4. By means of the axial blower 6, blowing medium, preferably air, can be sucked in at one end of the blow tube 4, guided through the blow tube 4 and blown out at the other end of the blow tube.

[0046] In a corresponding embodiment, the support-side tube section 4a of the blow tube 4 extends with a main directional component in the support transverse direction RQ of the support frame la, as in the example shown, that is to say the longitudinal axis LR of the support-side tube section 4a is parallel to the support transverse direction RQ. a extends parallel to the support transverse direction RQ, or as in the example shown, obliquely thereto with a greater directional component in comparison to a perpendicular straight direction.

[0047] In a corresponding embodiment, the support-side tube section 4a extends with its axial blow tube end 9, as in the example shown, beyond the second side region S2 of the support frame la facing away from the first side region SI, as can be seen from the Figure 7 In the example shown, the first side region SI of the support frame la is the right-hand side region and the second side region S2 is the left-hand side region, in an alternative embodiment the situation is reversed.

[0048] In a corresponding embodiment, the axial blow tube end 9, as in the example shown, is at least partially circumferentially surrounded by a protective ring element 10 connected to the support frame la.

[0049] In the example shown, the back-carrying blow device, in particular an electric blow device, that is to say the drive motor 2 is an electric motor, wherein it can for example be an electric blower device. In the case of the latter, the air inflow channel 18 serves as a suction channel. In this case, as in the case of the example shown, the battery pack 11 held at the support frame la serves as the energy source 3. Preferably here, as in the example shown, the blow tube 4 with its support-side tube section 4a is positioned below the battery pack 11 in the vertical direction.

[0050] In an alternative embodiment, the blow device can be of the suction type instead of the blow-out type as in the example shown and / or can be equipped with an internal combustion engine as a blower drive motor and a gasoline tank or the like as an auxiliary energy source.

[0051] The user can carry the blow device on his back, for which the back frame la in the case of the example shown has suitable back or shoulder straps, for example two shoulder straps 12 and / or a waist belt unit 13, fixed at the support frame la, as shown. In the support state of the blow device on the back of the user, the support frame la faces the front TV Facing the user's back, with the back side of the T-shirt R Back to back. The lateral direction RQ of the support frame 1a is perpendicular to the front side T of the support frame in the horizontal plane. V and the back side of the support frame T R The VH direction is defined by the spacing direction.

[0052] When the user carries the hair dryer, that is, the back frame 1 and supports it on their back, they can grasp and guide the hand-side section 4b of the hair dryer tube with their corresponding hand on the same side, in the case of the hair dryer shown, with their right hand. As a gripping aid and for operating the hair dryer, the hand-side section 4b of the hair dryer tube 4 has an attached operating handle 17 that preferably extends upward.

[0053] In a corresponding implementation of the blower, the support frame 1a has a bottom region 16, as in the example shown, and the support frame 1a or the back frame 1 can be placed on the ground with the bottom region 16.

[0054] In the corresponding implementation, the blower axis 6a, as shown in the example, is clamped between 1° and 30° to the vertical support transverse plane EV of the support frame 1a. Figure 4 The horizontal angle Wh is described in detail below. In a particular implementation, the horizontal angle Wh is between 2° and 15°, or more particularly between 2° and 3°. Alternatively, the horizontal angle Wh is above 30° or less than 1°, for example in such an implementation where the blower axis 6a extends parallel to the support transverse direction RQ of the support frame 1a, which is parallel to the support transverse plane EV in its aspect, and the horizontal angle Wh is therefore 0°.

[0055] In the corresponding implementation, the blower axis 6a, as shown in the example, is clamped at a maximum angle of 45° to the horizontal support plane EH of the support frame 1a. Figure 3 The vertical angle Wv is described in detail. In a particular implementation, the vertical angle Wv is at most 10°, wherein, in an auxiliary implementation, the blower axis 6a extends horizontally and therefore parallel to the horizontal support plane EH or parallel to the support lateral direction RQ of the support frame 1a, the vertical angle is, for example, 0°.

[0056] In an advantageous embodiment, the pipe section 4a on the support side, as in the illustrated embodiment, has a bent section 7 made of rigid tubing with a bending angle Kw of less than 90°. In a particular implementation, this bending angle Kw is in the range of 60° to 85°. In the illustrated embodiment, the bending angle Kw is close to 90°.

[0057] In a corresponding embodiment, the drive motor 2 has, as in the example shown, a motor axis 2a which is parallel to the blower axis 6a, as can be recognized in the cross-sectional view in Figure 7 Particularly, in the example shown the blower axis 6a and the motor axis 2a coincide with the longitudinal axis LR of the support-side tube section 4a. a

[0058] In a corresponding embodiment, the drive motor 2 is arranged, as in the example shown, in the support-side tube section 4a. Alternatively, the drive motor 2 can be arranged outside the support-side tube section 4a, for example at the support frame 1a. The positioning of the drive motor 2 and the axial blower 6 in the support-side tube section 4a in the case of the example shown can be recognized particularly in the cross-sectional view in Figure 7

[0059] In an advantageous embodiment, the drive motor 2 and the axial blower 6 are arranged, as in the case of the example shown, in the housing-constituting region 14 of the support-side tube section 4a, which is mechanically held at the support frame 1a at the same time. To this end, a sleeve-like holding piece 15 is provided, which surrounds the housing-constituting region 14 of the support-side tube section 4a and is fastened at the support frame 1a. Here, by the name of housing-constituting region is meant that it is the region of the support-side tube section 4a which accommodates the drive motor 2 and the axial blower 6 in the form of a housing.

[0060] In the example shown, the holding piece 15 comprises, as can be recognized in particular by Figure 8 and 9 the front half-shell 15a which is fixed at the support frame 1a, for example as shown via a holding dome 25 and an associated screw connection, and the rear half-shell 15b which is fastened at the front half-shell 15a, for example as shown also by means of a screw connection, and which clampingly holds the housing-constituting region 14 of the support-side tube section 4a between the two half-shells 15a, 15b. The ribs 21 which act as fastening serve the axial and tangential fastening of the housing-constituting region 14 of the support-side tube section 4a at the sleeve-like holding piece 15, as can be recognized in the cross-sectional view in Figure 9 In the example shown, the front half-shell 15a has a bulge 26 which points towards the support frame 1a, in which for example the electrical control device 24 for the blower drive motor 2 can be protectedly seated. In an alternative embodiment, the holding piece 15 can be configured in one piece or constitute an integrated component of the support frame 1a.

[0061] ​​In an alternative implementation, the drive motor 2 and the axial flow blower 6 are arranged inside the tube section 4a on the support side without having a common housing, which can then be held directly at the support frame 1a, for example, by its tube wall.

[0062] Preferably, the protective ring element 10 is directly supported at the support frame 1a and / or at the sleeve-shaped retainer 15. For this purpose, the protective ring element 10 can be mechanically connected to the support frame 1a directly and / or via the retainer 15. Alternatively, when the support-side tube section 4a is sufficiently rigid, the protective ring element 10 is additionally or solely supported at the support frame 1a via the support-side tube section 4a.

[0063] In an advantageous embodiment, the protective ring element 10 radially surrounds the axial blowpipe end portion 9 on the outer side with a radial spacing Ra and / or protrudes axially relative to the axial blowpipe end portion 9. Extending outwards, where both are achieved in the examples shown, as specifically in Figure 7 As can be identified in the text. Thus, the protective ring element 10 can protect the air tube terminal 9 from radial or axial impacts in such a way that it is not mechanically connected to it, i.e., in all cases, radial or axial impacts act first on the protective ring element 10, which absorbs the impact force and can be directly or indirectly transmitted to the support frame 1a, wherein a fully comprehensive avoidance movement (sometimes called deviation movement) of the protective ring element 10 relative to the air tube terminal 9 is possible. Therefore, for example, the radial spacing Ra is sized such that it is at least as large as the maximum foreseeable temporary radial spacing change of the protective ring element 10 relative to the air tube terminal 9 due to such impacts.

[0064] In an advantageous embodiment, the blowing device has, as in the shown example, a gas guide cone 22 which, in the case of a radially annular air inflow opening 18a, is coaxially in front of the axial pipe wall end region 23 of the support-side blowing pipe section 4a and has an air inflow grille 5 which is arranged at the air inflow opening 18a and consists of an elastically deformable material. The gas guide cone 22 is axially outwardly closed with a cover plate which, in this case, constitutes the axial blowing pipe terminal end 9 and maintains the axial spacing Ag relative to the axial pipe wall end region 23 of the support-side blowing pipe section 4a, which defines the effective air inflow cross section for the radial air inflow opening 18a. The air inflow grille 5 non-contactingly surrounds the axial pipe wall end region 23 of the support-side blowing pipe section 4a at least partially circumferentially with a radial spacing Rg and is connected, on the one hand, at the axial outer end with the protection ring element 10 and, on the other hand, at the axial inner end with the sleeve-like holder 15, preferably axially behind the axial pipe wall end region 23 of the support-side blowing pipe section 4a.

[0065] The gas guide cone 22 constitutes the air-tight, funnel-like axial outer delimitation of the thereby radially open associated air inflow channel 18 and holds at the motor / blower structure in the support-side pipe section 4a. The axial pipe wall end region 23 of the support-side pipe section 4a of the blowing pipe can be optionally correspondingly funnel- or conically shaped axially outwardly as in the shown example and in this way constitutes an air inflow funnel 8. In this case, the air inflow channel 18 to the blower 6 is axially flanked on both sides by conically or funnel-like guiding surfaces next to the annular radial air inflow opening 18a. In an alternative implementation, the support-side pipe section 4a is not closed with a conical expansion at the axial pipe wall end region 23.

[0066] Optionally, the protection ring element 10 has, as in the shown example, an axial terminal end 19 which serves as or constitutes a component part of the axial end of the protection ring element 10. In this case, the protection ring element 10 is axially outwardly spaced with a gap spacing Sa from the cover plate which, in this case, constitutes the blowing pipe terminal end 9, as can be seen from Figure 7 The gap spacing Sa makes it possible in this embodiment for the terminal end 19 of the protection ring element 10 to axially escape under impact from the blowing pipe terminal end 9, for which it is correspondingly dimensioned like the above-mentioned radial spacing Ra of the protection element 10.

[0067] In an alternative implementation variant, the gas guide cone 22 is dispensed with, so that the axial blowing pipe terminal end 9 is then constituted by the axial end side end 9' of the axial pipe wall end region 23 of the support-side pipe section 4a, as in Figure 7As is shown in the drawing. In this case, the protection ring element 10 then maintains the mentioned radial clearance Ra and with its optional terminal portion 19 maintains the mentioned axial clearance spacing Sa of the axial pipe wall end region 23 of the support-side pipe section 4a relative to the axial end-side end 9' of the air inflow grid 5.

[0068] The air inflow grid 5 constitutes a grid structure for the passage of the blowing medium, in particular air, wherein the radial intake or blow-out characteristic for the blowing pipe 4 is provided at the end, which is axially outwardly closed by the air guide cone 22. In the case of this configuration, air can thus radially from the outside reach the air inflow channel 18. The air inflow grid 5 can act as an impact-absorbing element and, for example in the case of a collision, elastically deformably absorb the impact forces acting on the protection ring element 10, which prevents damage to the blowing pipe end 9 or the air inflow funnel 8. Here, the air inflow grid 5 can move in the range of its radial clearance Rg relative to the axial pipe wall end region 23 of the support-side pipe section 4a without contacting it. Thus, the flexurally soft air inflow grid 5 can in the case of no damage to the axial pipe wall end region 23 or the air inflow funnel 8 deformably intercept the impact forces acting on the more rigid protection ring element 10, in particular axially and / or radially from the outside, and guide them away to the flexurally rigid holder 15, which can guide the impact forces on its side to the support frame 1a.

[0069] The air inflow grid 5 is preferably fastened to the holder 15, for example by means of a screw connection, as in the example shown. Figure 7 The form-fit connection 20 is visible as being axially supported at the sleeve-like holder 15. In addition, the air inflow grid 5 can be fastened radially at the sleeve-like holder 15, for example by means of an attached screw connection.

[0070] As is more precisely visible from the drawing, Figure 8 and 9 The air inflow grid 5 is not in the example shown configured in a ring shape closed, but has a ring shape open in the lower region, in order to leave space there for the bottom region 16 of the support frame 1a, which limits the intake space or the air inflow opening 18a there and can additionally protect the axial blowing pipe end 9 from impacts. The air inflow grid 5 can be pre-fabricated in one piece or consist of a plurality of separate grid pieces, as required.

[0071] In an advantageous embodiment, the protection ring element 10 surrounds the axial blowing pipe end 9 at least on the bottom side, as in the case of the example shown. Thus, the protection ring element 10 can protect the axial blowing pipe end 9 on the bottom side against impact or blow effects and the like. Alternatively, it surrounds the axial blowing pipe end 9, for example only in the rear section.

[0072] In an advantageous embodiment, the protection ring element 10 surrounds the axial blow pipe terminal portion 9 completely, that is to say along its entire circumference, as in the example shown. The blow pipe terminal portion 9 can thus be protected overall against impact or blow effects and the like.

[0073] In an advantageous embodiment, the protection ring element 10, as in the example shown, comprises a ring holding section 10a connected to the support frame la and a ring-shaped protection section 10b which is curvedly guided from the ring holding section 10a and which surrounds the axial blow pipe terminal portion 9 over a circumferential angle of at least 180°. In the example shown, the protection section 10b surrounds the blow pipe terminal portion 9 over its entire circumferential angle of 360°. The air inlet grille 5 is supported at the protection section 10b and optionally also at the ring holding section 10a, as in the example shown. Furthermore, the protection section 10b can serve as a stand for the terminal portion 19 in this case.

[0074] As the examples shown and further explained above illustrate, the application provides in a very advantageous manner a backpack blow device which can be configured as a blow-out or alternatively as a suction blow device, which is optimized in terms of its blow medium guidance and enables a compact arrangement of the blow pipe at the support frame of the back frame, if necessary together with a battery pack as an energy source for the blow machine drive motor. The arrangement of the mainly horizontal and laterally projecting support frame of the pipe section of the support side of the blow pipe contributes to a compact construction form with optimum air guidance. Additionally or alternatively, the blow pipe terminal portion can be protected overall or partially at its circumference by a protection ring element against external mechanical effects. Furthermore, the possibility of the blow pipe to be arranged with its support side pipe section under the battery pack contributes to a compact construction of the blow device.

Claims

1. Portable hair dryer with... - Back frame (1) with support frame (1a), -A blower tube (4) having a support section (4a) held at the back of the support frame (1a) and a hand section (4b) extending through the first side region (S1) of the support frame (1a). -Drive motor (2), - Energy source (3) for the drive motor (2), and - An axial flow blower (6) driven by the drive motor (2), the axial flow blower having an axial blower axis (6a) and arranged in a pipe section (4a) on the support side of the blower pipe (4), Its features are, - The support-side section (4a) of the blower pipe (4) extends in the support transverse direction (RQ) of the support frame (1a) with a main directional component and has an axial blower pipe end portion (9), which extends laterally upward beyond the second side region (S2) of the support frame (1a) opposite to the first side region (S1) and / or is surrounded at least partially on the peripheral side by a protective ring element (10) connected to the support frame (1a). - The hair dryer axis (6a) is sandwiched between the vertical support transverse plane (EV) of the support frame (1a) at a horizontal angle (Wh) between 1° and 30°.

2. The portable hair dryer according to claim 1, further characterized in that the hair dryer axis (6a) is sandwiched between a horizontal angle (Wh) of 2° and 15° with the vertical support transverse plane (EV) of the support frame (1a) and / or with a vertical angle (Wv) of up to 45° with the horizontal support plane (EH) of the support frame (1a).

3. The backpack blower according to claim 1, further characterized in that the tube section (4a) on the support side has a bent section (7) made of rigid tube material with a bending angle (Kw) of less than 90°.

4. The backpack hair dryer according to any one of claims 1 to 3, further characterized in that the drive motor (2) is an electric motor and the energy source comprises a battery pack (11) held at the support frame (1a).

5. The backpack hair dryer according to any one of claims 1 to 3, further characterized in that the drive motor (2) has a motor axis (2a) parallel to the hair dryer axis (6a) and / or is arranged in the tube section (4a) on the support side.

6. The backpack blower according to claim 5, further characterized in that the drive motor (2) and the axial flow blower (6) are arranged in the region (14) of the housing formed by the tube section (4a) on the support side.

7. The backpack blower according to any one of claims 1 to 3, further characterized in that the tube section (4a) on the support side is connected to the support frame (1a) by a sleeve-shaped retainer (15).

8. The backpack blower according to claim 7, further characterized in that the protective ring element (10) is supported at the sleeve-shaped retainer (15).

9. The backpack hair dryer according to any one of claims 1 to 3, further characterized in that the protective ring element (10) surrounds the axial air tube terminal portion (9) with a radial spacing (Ra) and / or has an axial protrusion relative to the axial air tube terminal portion (9). Extend.

10. The backpack hair dryer according to claim 7, further characterized in that, - Air guide cone (22), which, in the case of forming an annular radial air inflow opening (18a), is coaxially positioned at the axial end region (23) of the pipe section (4a) on the support side and forms the air blowing pipe terminal (9) with the axial outer end. An air inlet grille (5) made of elastically deformable material is arranged at the air inlet opening (18a), the air inlet grille surrounds the axial pipe wall end region (23) of the support-side pipe section (4a) at least partially on the peripheral side with an axial spacing (Rg) without contact, and the air inlet grille (5) is connected to the protective ring element (10) on the one hand at the axially outer end along the axial direction in front of the blower pipe terminal (9) and the air inlet grille (5) on the other hand at the axially inner end along the axial direction behind the blower pipe terminal (9) to the sleeve-shaped retainer (15).

11. The backpack blower according to any one of claims 1 to 3, further characterized in that the protective ring element (10) surrounds the axial blower tube terminal (9) at least on the bottom side.

12. The backpack blower according to claim 11, further characterized in that the protective ring element (10) completely surrounds the axial blower tube terminal (9).

13. The backpack blower according to any one of claims 1 to 3, further characterized in that the protective ring element (10) includes a ring retaining section (10a) connected to the support frame (1a) and a protective section (10b) bent out from the ring retaining section (10a), which surrounds the axial blower tube terminal (9) at a circumferential angle of at least 180°.

14. The backpack blower according to any one of claims 1 to 3, further characterized in that the backpack blower is an electric blower.

15. The backpack hair dryer according to claim 2, further characterized in that the hair dryer axis (6a) and the vertical support transverse plane (EV) of the support frame (1a) are sandwiched at a horizontal angle (Wh) between 2° and 3°.

16. The backpack hair dryer according to claim 2, further characterized in that the hair dryer axis (6a) and the horizontal support plane (EH) of the support frame (1a) enclose a vertical angle (Wv) of up to 10°.

17. The backpack blower according to claim 1, further characterized in that the tube section (4a) on the support side has a bent section (7) made of rigid tubing with a bending angle (Kw) between 60° and 85°.

18. The backpack blower according to any one of claims 1 to 3, further characterized in that the protective ring element (10) is directly supported on the support frame (1a).

19. The backpack hair dryer according to any one of claims 1 to 3, further characterized in that, - Air guide cone (22), which, in the case of forming an annular radial air inflow opening (18a), is coaxially positioned at the axial end region (23) of the pipe section (4a) on the support side and forms the air blowing pipe terminal (9) with the axial outer end. An air inlet grille (5) made of elastically deformable material is arranged at the air inlet opening (18a), the air inlet grille surrounds the axial pipe wall end region (23) of the pipe section (4a) on the support side at least partially on the peripheral side with an axial spacing (Rg) without contact, and the air inlet grille (5) is connected to the protective ring element (10) on the axially outer end along the axial direction in front of the blower pipe terminal (9) and the air inlet grille (5) is connected to the support frame (1a) on the axially inner end along the axial direction behind the blower pipe terminal (9).

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