WO2015139720A1 - Agencement de ventilateur - Google Patents

Agencement de ventilateur Download PDF

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Publication number
WO2015139720A1
WO2015139720A1 PCT/EP2014/055280 EP2014055280W WO2015139720A1 WO 2015139720 A1 WO2015139720 A1 WO 2015139720A1 EP 2014055280 W EP2014055280 W EP 2014055280W WO 2015139720 A1 WO2015139720 A1 WO 2015139720A1
Authority
WO
WIPO (PCT)
Prior art keywords
motor
blower
providing
sleeve
rotor hub
Prior art date
Application number
PCT/EP2014/055280
Other languages
English (en)
Inventor
Christian BYLUND
Lars Malmqvist
Pär MARTINSSON
Tobias Nyberg
Jan LEJON
Fredrik WIBLING
Jonas HAGLIND
Original Assignee
Husqvarna Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Husqvarna Ab filed Critical Husqvarna Ab
Priority to PCT/EP2014/055280 priority Critical patent/WO2015139720A1/fr
Publication of WO2015139720A1 publication Critical patent/WO2015139720A1/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G20/00—Cultivation of turf, lawn or the like; Apparatus or methods therefor
    • A01G20/40—Apparatus for cleaning the lawn or grass surface
    • A01G20/43—Apparatus for cleaning the lawn or grass surface for sweeping, collecting or disintegrating lawn debris
    • A01G20/47—Vacuum or blower devices

Definitions

  • Example embodiments generally relate to outdoor power equipment and, more particularly, relate to optimizing a structural arrangement of various blower components to improve performance and operator experience.
  • Outdoor power equipment includes such devices as mowers, trimmers, edgers, chainsaws, blowers and the like. These devices are often used to perform tasks that inherently require the devices to be mobile. Accordingly, these devices are typically made to be relatively robust and capable of handling difficult work in hostile environments, while balancing the requirement for mobility.
  • Some example embodiments may therefore provide structures that are positioned and oriented to facilitate improved operation and ergonomics. Some embodiments may also provide for the provision of design features that improve performance and reduce noise production relative to conventional blowers.
  • a blower of an example embodiment may include a housing including a handle portion, a blower tube disposed below the handle portion, a motor provided in a motor sleeve, a fan assembly operably coupled to the motor to force air through the blower tube responsive to operation of the motor, control circuitry provided in a portion of the housing to selectively apply power to the motor for operation of the motor, and a battery disposed rearward of the handle portion.
  • a center of mass of each of the motor, the fan assembly and the control circuitry is disposed forward of a balance point at the handle portion.
  • the battery may be integrated into the housing such that a center of mass of the battery is disposed rearward of the balance point to act as a counterweight.
  • a method of assembling a blower may include providing a housing including a handle portion, providing a blower tube below the handle portion, providing a motor in a motor sleeve, providing a fan assembly operably coupled to the motor to force air through the blower tube responsive to operation of the motor, providing control circuitry in a portion of the housing to selectively apply power to the motor for operation of the motor, and providing a battery rearward of the handle portion.
  • a center of mass of each of the motor, the fan assembly and the control circuitry may be disposed forward of a balance point at the handle portion and the battery may be integrated into the housing such that a center of mass of the battery is disposed rearward of the balance point.
  • a blower may include a housing including a handle portion, a blower tube disposed below the handle portion, a motor provided in a motor sleeve, a fan assembly operably coupled to the motor to force air through the blower tube responsive to operation of the motor, control circuitry provided in a portion of the housing to selectively apply power to the motor for operation of the motor, and a battery disposed rearward of the handle portion.
  • the motor sleeve may include a motor attachment plane at which the motor is affixed to the motor sleeve.
  • the motor may turn a shaft that extends through the motor attachment plane in an upstream direction.
  • the shaft may be operably coupled to a rotor hub upstream of the motor attachment plane.
  • a blower may include a housing including a handle portion, a blower tube disposed below the handle portion, a motor provided in a motor sleeve, a fan assembly operably coupled to the motor to force air through the blower tube responsive to operation of the motor, control circuitry provided in a portion of the housing to selectively apply power to the motor for operation of the motor, and a battery disposed rearward of the handle portion.
  • the fan assembly may include a channel defining a distance D between stator blades and rotor fan blades of the fan assembly. The distance D may be selected to be in a range between about S/2 to about S/10, S being a diameter of the stator blades.
  • FIG. 1 illustrates a cutaway side view of a blower in accordance with an example embodiment
  • FIG. 2 a cross section view of an area of a blower tube proximate to the motor in accordance with an example embodiment
  • FIG. 3A is a front view of an annular arrangement of stator blades to show a full diameter of the stator blades in accordance with an example embodiment
  • FIG. 3B illustrates a side view of the stator blades and the rotor fan blades of the fan assembly in accordance with an example embodiment
  • FIG. 4 is a block diagram of a method of arranging blower components in accordance with an example embodiment.
  • operable coupling should be understood to relate to direct or indirect connection that, in either case, enables functional interconnection of components that are operably coupled to each other.
  • Some example embodiments described herein provide an ergonomic and balanced design for a blower that integrates the battery into the housing of the blower in a way that positions components to achieve a comfortable feel for the operator.
  • the battery can be employed as a counterweight for the other significant components of the blower.
  • Some example embodiments may also provide a way to avoid the typical stacked arrangement of components. By avoiding the typical stacked arrangement, the length and weight of the blower may be reduced.
  • Some example embodiments may also provide for an optimal range of distances between rotor and stator components in order to reduce noise generation.
  • FIG. 1 illustrates a cross sectional view of a blower 100 taken along a longitudinal centerline of the blower 100.
  • the blower 100 of FIG. 1 merely represents one example of power equipment on which an example embodiment may be employed.
  • the blower 100 may include a housing 110 inside which various components of the blower 100 are housed.
  • the blower 100 may further include a motor 120 or power unit for providing the driving force to move air through the blower 100.
  • the power unit may be a three phase electric motor that is operated under the control of a control unit 130 or control circuitry and powered by a battery 140 or battery adaptor.
  • a DC motor could be used in some embodiments as well.
  • the housing 110 may be formed of plastic, composite materials, metals or any other desirable materials.
  • the housing 110 may be formed of two or more molded pieces that can be fit together.
  • the molded pieces may form half-shells (e.g., right and left half-shells) that can be affixed to each other via welding, adhesives, snap fittings, fixing members (e.g., screws), and/or the like. When molded pieces are fit together, they may form a seam at the location of joining between the molded pieces.
  • control unit 130 may be housed in its own portion of the housing 110.
  • the portion of the housing 110 in which the control unit 130 is housed may be referred to as a control unit housing portion 132, and the control unit housing portion 132 may be an integral part of a half-shell (as described above) or may be a separate housing portion that is joined to other housing portions.
  • the control unit housing portion 132 may be disposed proximate to a portion of the housing 110 near which the motor 120 is provided.
  • the battery 140 may be housed in a battery compartment 142 that may be disposed at a rear portion of the housing 110, separated from the control unit housing portion 132 by a handle 144.
  • the handle 144 may include a trigger 146 that may be operated by a finger of the operator while the operator holds the handle 144. Actuation of the trigger 146 may cause power from the battery 140 to be selectively applied to the motor 120 to turn the motor 120 based on control provided by the control unit 130.
  • control unit 130 may include interlocks, protective functions or other control mechanisms that may sense various conditions of the blower 100 via sensors, switches or other mechanisms in order to selectively control the application of power to the motor 120 based on indications of user intent (e.g., via actuation of the trigger 146) and/or determinations regarding the state of the blower 100 as provided by the sensors, switches or other mechanisms.
  • FIG. 1 shows an example in which the trigger 146 is used for selective powering of the motor 120
  • other example embodiments may employ a selector, switch, button or other such operative member in order to selectively control operation of the motor 120.
  • on/off, speed control or other operable functions for controlling the motor 120 may be performed using an operative member of any desirable form, and the trigger 146 is just one example.
  • the blower 100 may further include a blower tube 150 that is attached to housing 110 (or is a part of the housing 110) and through which air may be expelled.
  • the blower tube 150 may define a blower tube axis 152, which defines an axial centerline of the blower tube 150.
  • the blower tube 150 may include an inlet portion 154 and an outlet 156.
  • the outlet 156 may be at a distal end of the blower tube 150 and the inlet portion 154 may be at an opposite end of the blower tube 150 proximate to the motor 120 and the battery 140.
  • the inlet portion 154 may include louvers, vanes, guide holes or other such apertures 158 formed in the housing 110 to enable air to enter into the blower tube 150 responsive to operation of the motor 120 to be expelled via the outlet 156.
  • the operation of the motor 120 may cause an impeller or fan assembly 160 to rotate so that a low pressure area is generated to draw air into the inlet portion 154 through the apertures 158 to be passed through the fan assembly 160 and expelled from the blower tube 150 at the outlet 156 to blow leaves, debris, or any other material.
  • the motor 120 and the fan assembly 160 may each be coaxial with the blower tube axis 152, so that air exiting the fan assembly 160 is generally moved (although such flow may be turbulent) along a direction substantially parallel to the blower tube axis 152.
  • air entering into the inlet portion 154 is generally drawn in at an angle relative to the blower tube axis 152.
  • the angle may be about 90 degrees as shown by arrow 162 in FIG. 1.
  • the angle could be an obtuse angle in some embodiments.
  • the air entering into the blower tube 150 may undergo a direction change relative to the direction such air takes through the fan assembly 160 and/or through the blower tube 150 as the air approaches the outlet 156 (i.e., as outlet air).
  • the louvers, vanes, guide holes or other such apertures 158 formed in the housing 110 to embody the inlet portion 154 may be strategically located to reduce the ability of noise from the motor 120 or airflow in the blower tube 150 from transmitting up to the operator's ears.
  • the louvers, vanes, guide holes or other such apertures 158 of the inlet portion 154 may be formed on a side portion of the housing 110 as shown in FIG. 1.
  • the apertures 158 may be provided generally inline with each other on each side of the blower 100 and may be angled at about 45 degrees relative to a plane passing through the centerline of the blower 100 to divide it into right and left halves.
  • the apertures 158 may be provided to run parallel to each other and may be provided at different angles relative to the plane described above.
  • the battery compartment 142 may be disposed at a rearward most end of the housing 110, which may be above or even rearward of the inlet portion 154.
  • the control unit housing portion 132 may be disposed proximate to the motor 120 outside of the blower tube 150.
  • the battery 140 is located at a rear of the blower 100 and the outlet 156 is at the front of the blower 100.
  • the handle 144 is generally held by the operator in a manner that places the handle 144 at the top with the motor 120 suspended below the handle 144.
  • the blower 100 may be designed for balance and optimal ergonomics while being operated.
  • the handle 144 is generally designed to extend substantially horizontal to the ground plane while the operator holds the blower 100 in a natural or comfortable grip as shown by line 180, which is parallel to the ground plane.
  • the blower tube axis 152 lies at an angle relative to line 180 and the ground plane. The angle may be between about 15 degrees and about 35 degrees in some embodiments, and could be selected based on balancing the centers of mass of the various components of the blower 100, while also generating a natural downward cant angle that generally points the outlet 156 toward the ground when the blower 100 is held in its most comfortable and natural position by the operator.
  • FIG. 1 shows example vectors indicative of the masses of various components of the blower 100.
  • mi represents the center of mass of the battery 140, which is relatively heavy and located at a rear portion of the blower 100, closest to the intersection of the blower tube axis 152 and line 180.
  • m 2 represents the smaller center of mass of the motor 120 and m 3 represents the center of mass of the control unit 130.
  • the "x" shape 182 represents a balance or pivot point about which the various centers of mass of the blower 100 are balanced.
  • rri 4 represents the center of mass of the fan assembly 160 of the blower 100, which lies forward of the handle 144. The positioning of the components as shown in FIG.
  • the battery 140 can act as a counterweight for the other components and balance about the balance point 182 proximate to where the operator normally holds the blower 100 at the handle 144.
  • This structure therefore causes the blower 100 to have a natural downward cant angle when held in its ergonomically optimized, balanced condition, and also places the natural pivot point at the location of the operator's hand so that there are not any unnatural or additional stresses on the operator's wrist or hand when the blower 100 is in use.
  • the structure provided in FIG. 1 also enables the provision of a longer inlet length for the inlet portion 154.
  • an electric motor e.g., motor 120
  • the motor 120 can also make weight balance considerations complex since the motor 120 could account for as much as 20% of the overall weight of the product in some cases.
  • the motor 120 is fitted with a conventional axial fan system in which a shaft extends from an end of the motor and the fan system (including at least rotor blades) is attached to the shaft, the length of the combined motor and fan system may cause the overall length of the blower 100 to be increased as the inlet, fan, motor, stator, cone and outlet may all stack sequentially with each other. This stacking of components in a linear fashion may further complicate balance issues and change the pivot point 182.
  • some example embodiments may provide for an attachment plane between the motor 120 and the fan assembly 160 to be positioned upstream of the rotor blades of the fan assembly 160.
  • the rotor blades may be positioned downstream (in the direction of flow) and completely behind the attachment plane of the motor 120 and the fan assembly 160.
  • FIG. 2 illustrates a partially cutaway side view of the region in which the fan assembly 160 and motor 120 are provided to illustrate this design feature in accordance with an example embodiment.
  • the motor 120 may be housed in a motor sleeve 200 that may extend substantially around the periphery of the motor 120 and define an interior wall forming a channel 210 though which air expelled by rotor fan blades 220 of the fan assembly 160 can travel to pass through stator blades 230 of the fan assembly 160 before exiting the blower 100 via the blower tube 150.
  • the stator blades 230 and the rotor fan blades 220 may each form an annular ring of blades for propelling (as in the case of the rotor fan blades 220) or directing (as in the case of the stator blades 230) airflow through the blower 100.
  • the motor sleeve 200 may be formed integrally with the stator blades 230 to provide a structure inside the blower tube 150 from which the motor 120 can be attached.
  • the motor sleeve 200 could be a continuous cylindrical or semi-cylindrical member, or it could have holes therein to permit cooling air to reach the motor 120.
  • the motor 120 may be attached to the motor sleeve 200 via screws 202 or any other suitable attachment mechanisms.
  • the screws 202 may extend through an end portion of the motor sleeve 200 to engage and hold the motor 120.
  • the end portion of the motor sleeve 200 may form a motor attachment plane 204.
  • the screws 202 may therefore extend parallel to the tube axis 152 into an upstream end of the motor 120 through the motor attachment plane 204.
  • the motor 120 may include a shaft 206 that may extend along the axis of the motor 120 (which may be coaxial with the tube axis 152).
  • the shaft 206 may extend in a direction substantially opposite of the direction of extension of the screws 202 and the direction of flow of air through the fan assembly 160.
  • the shaft 206 may engage a rotor hub 240 to which the rotor fan blades 220 may be mounted.
  • the corresponding rotation may be transferred to the rotor hub 240 which in turn causes the rotor fan blades 220 to rotate and force air from the inlet portion 154 through the channel 210 and ultimately through the blower tube 150 to the outlet 156.
  • the rotor hub 240 may have a somewhat conical shape centered around an axis formed by the shaft 206.
  • the rotor hub 240 may be attached to the shaft 206 at any point along the shaft 206 where the rotor hub 240 and shaft 206 overlap, and a rearmost point of the overlap region over which the rotor hub 240 overlaps with the shaft 206 may lie proximate to the motor attachment plane 204.
  • the rotor fan blades 220 may actually be provided downstream of the rotor hub 240 and the motor attachment plane 204.
  • the rotor hub 240 may extend in a downstream direction to overlap a portion of the motor sleeve 200 and extend over at least a portion of a periphery of the motor 120, at which point the rotor fan blades 220 are mounted.
  • the rotor fan blades 220 may be provided to have a positive overlap having a distance L with the motor sleeve 200 where L is measured from the motor attachment plane 204 to a downstream-most point of extension of the rotor fan blades 220.
  • the motor sleeve 200 may have a diameter A over at least a portion thereof (which may be a majority portion thereof). However, at the area of overlap between the rotor hub 240 and the motor sleeve 200 (defined by the overlap distance L), the motor sleeve 200 may have a diameter that is less than A.
  • the rotor hub 240 may further overlap with at least some portion of the windings of the motor 120.
  • the rotor hub 240 may have a diameter of about A at the area of overlap between the rotor hub 240 and the motor sleeve 200 (defined by the distance L).
  • the rotor fan blades 220 may rotate freely and push air through the channel 210 and there may be a substantially small (or no) change in diameter of the channel 210 over its length, and any discontinuity in diameters of the motor sleeve 200 and the rotor hub 240 may be minimal at the point at which they meet to improve the aerodynamic characteristics and performance of the fan assembly 160.
  • the overall length of the blower 100 may be reduced since the stacked arrangement of conventional designs may be avoided, and balance of the components of the blower 100 may be improved.
  • a ratio may be established to relate the sizes of the diameter A of the downstream portion of the motor sleeve 200 (which may be the maximum diameter of the motor sleeve 200 and may also match the maximum diameter of the rotor hub 240) and the overlap distance L.
  • the overlap distance L may be selected to be greater than or equal to a hub diameter ratio of A/5.
  • Airflow through the blower tube 150 may be expected to be somewhat turbulent and may generate some level of noise.
  • a distance D between the rotor fan blades 220 and the stator blades 230 may be controlled to obtain desired noise generation performance.
  • the distance D may be selected based on a relationship between the overall diameter of the stator blades 230 and the distance D.
  • FIG. 3 which includes FIGS. 3 A and 3B, illustrates an example embodiment to show how the distance D may be selected for noise reduction.
  • FIG. 3A is an illustration of the annular arrangement of the stator blades 230 to show a diameter S of the stator blades 230.
  • FIG. 3B illustrates a side view of the stator blades 230 and the rotor fan blades 220 of the fan assembly 160 in accordance with an example embodiment.
  • a minimum distance D may be selected in a range of about S/10 to about S/2.
  • desirable values for D may therefore be about 15 mm to about 50 mm.
  • D of about 25 mm has shown noise level reductions on the order of about 8 dB(A) to about 4 dB(A).
  • a reduction of amplitude of blade passing frequencies may be achieved to give the fan assembly 160 more favorable acoustic performance characteristics.
  • any impact on efficiency may be negligible (e.g., less than about 2% to 3%), and could in any case be mitigated.
  • FIG. 4 is a block diagram of a method of arranging blower components in accordance with an example embodiment.
  • the method may include providing a housing including a handle portion at operation 400, providing a blower tube below the handle portion at operation 410, and providing a motor in a motor sleeve at operation 420.
  • the method may further include providing a fan assembly operably coupled to the motor to force air through the blower tube responsive to operation of the motor at operation 430, providing control circuitry in a portion of the housing to selectively apply power to the motor for operation of the motor at operation 440 and providing a battery rearward of the handle portion at operation 450.
  • a center of mass of each of the motor, the fan assembly and the control circuitry may be disposed forward of a balance point at the handle portion and the battery may be integrated into the housing such that a center of mass of the battery is disposed rearward of the balance point to act as a counterweight to the other masses.
  • the method may include additional optional operations.
  • the method may further include providing the fan assembly to include a channel defining a distance D between stator blades and rotor fan blades of the fan assembly.
  • the distance D may be selected to be in a range between about S/2 to about S/10, where S is a diameter of the stator blades.
  • the method may further include (or alternatively include) providing the motor sleeve to include a motor attachment plane at which the motor is affixed to the motor sleeve, wherein the motor turns a shaft that extends through the motor attachment plane in an upstream direction, wherein the shaft is operably coupled to a rotor hub upstream of the motor attachment plane.
  • the method may further include (or alternatively include) providing the rotor hub to overlap at least a portion of the motor sleeve. In some embodiments, the method may further include (or alternatively include) providing the rotor hub to overlap at least a portion of the motor sleeve. In some cases, the rotor hub may be provided to overlap the motor sleeve by an overlap distance L, and the overlap distance L may be selected to be greater than or equal to a hub diameter ratio of about A/5, where A defines a diameter of the rotor hub.
  • a blower of an example embodiment may therefore include a housing including a handle portion, a blower tube disposed below the handle portion, a motor provided in a motor sleeve, a fan assembly operably coupled to the motor to force air through the blower tube responsive to operation of the motor, control circuitry provided in a portion of the housing to selectively apply power to the motor for operation of the motor, and a battery disposed rearward of the handle portion.
  • a center of mass of each of the motor, the fan assembly and the control circuitry is disposed forward of a balance point at the handle portion.
  • the battery may be integrated into the housing such that a center of mass of the battery is disposed rearward of the balance point to act as a counterweight.
  • the blower of some embodiments may include additional features that may be optionally added either alone or in combination with each other.
  • the fan assembly may include a channel defining a distance D between stator blades and rotor fan blades of the fan assembly.
  • the distance D may be selected to be in a range between about S/2 to about S/10, where S is a diameter of the stator blades.
  • the distance D may be selected to be between about 15 mm to about 50 mm.
  • the distance D may be selected to be about 25 mm.
  • the motor sleeve may include a motor attachment plane at which the motor is affixed to the motor sleeve.
  • the motor may turn a shaft that extends through the motor attachment plane in an upstream direction, and the shaft may be operably coupled to a rotor hub upstream of the motor attachment plane.
  • (5) rotor fan blades attached to the rotor hub may extend downstream of the motor attachment plane.
  • (6) an entirety of the rotor fan blades may be provided downstream of the motor attachment plane.
  • (7) the motor attachment plane may be located between a portion of the rotor hub that engages the shaft and rotor fan blades.
  • any or all of (1) to (7) may be employed in addition to the optional modifications or augmentations described below.
  • any or all of (1) to (7) may be employed in addition to the optional modifications or augmentations described below.
  • a diameter of the rotor hub may be substantially equal to a diameter of at least a portion of the motor sleeve that is proximate to the channel. Additionally or alternatively, the rotor hub may overlap at least a portion of the motor sleeve. Additionally or alternatively, the rotor hub may overlap the motor sleeve by an overlap distance L, and the overlap distance L may selected to be greater than or equal to a hub diameter ratio of about A/5, where A defines a diameter of the rotor hub. Additionally or alternatively, the fan assembly and the motor may be coaxial with a tube axis of the blower tube.

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Abstract

L'invention concerne un procédé d'assemblage d'un ventilateur, comprenant : la fourniture d'un boîtier (110) comprenant une partie poignée (144), le placement d'un tube de soufflage (150) au-dessous de la partie poignée (144), le placement d'un moteur (120) dans une gaine de moteur (200), le placement d'un ensemble ventilateur (160) couplé de manière fonctionnelle au moteur (120) pour forcer l'air à passer travers le tube de soufflage (150) en réponse au fonctionnement du moteur (120), le placement de circuits de commande (130) dans une partie du boîtier (110) pour appliquer sélectivement de l'énergie au moteur (120) pour le fonctionnement du moteur (120), et le placement d'une batterie (140) à l'arrière de la partie poignée. La gaine de moteur (200) comprend un plan de fixation de moteur (204) au niveau duquel le moteur (120) est fixé à la gaine de moteur (200). Le moteur (120) fait tourner un arbre (206) qui s'étend à travers le plan de fixation de moteur (204) dans une direction amont. L'arbre (206) est couplé de manière fonctionnelle à un moyeu de rotor (240) en amont du plan de fixation de moteur (204). L'invention concerne le ventilateur assemblé par ce procédé.
PCT/EP2014/055280 2014-03-17 2014-03-17 Agencement de ventilateur WO2015139720A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2014/055280 WO2015139720A1 (fr) 2014-03-17 2014-03-17 Agencement de ventilateur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2014/055280 WO2015139720A1 (fr) 2014-03-17 2014-03-17 Agencement de ventilateur

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WO2015139720A1 true WO2015139720A1 (fr) 2015-09-24

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PCT/EP2014/055280 WO2015139720A1 (fr) 2014-03-17 2014-03-17 Agencement de ventilateur

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6158082A (en) * 1998-03-10 2000-12-12 The Toro Company Portable blower with blower tube noise reduction
WO2012136906A2 (fr) * 2011-04-07 2012-10-11 Pellenc (Societe Anonyme) Souffleur electroportatif autonome a vitesse de sortie d'air modulable
WO2014030755A1 (fr) * 2012-08-20 2014-02-27 Hitachi Koki Co., Ltd. Soufflante portative

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6158082A (en) * 1998-03-10 2000-12-12 The Toro Company Portable blower with blower tube noise reduction
WO2012136906A2 (fr) * 2011-04-07 2012-10-11 Pellenc (Societe Anonyme) Souffleur electroportatif autonome a vitesse de sortie d'air modulable
WO2014030755A1 (fr) * 2012-08-20 2014-02-27 Hitachi Koki Co., Ltd. Soufflante portative

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