US20070294855A1 - Backpack blower - Google Patents
Backpack blower Download PDFInfo
- Publication number
- US20070294855A1 US20070294855A1 US11/808,889 US80888907A US2007294855A1 US 20070294855 A1 US20070294855 A1 US 20070294855A1 US 80888907 A US80888907 A US 80888907A US 2007294855 A1 US2007294855 A1 US 2007294855A1
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- US
- United States
- Prior art keywords
- air intake
- blower
- backpack
- partition
- opposite surface
- Prior art date
- Legal status (The legal status 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 status listed.)
- Abandoned
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Classifications
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L5/00—Structural features of suction cleaners
- A47L5/12—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum
- A47L5/14—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum cleaning by blowing-off, also combined with suction cleaning
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- 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
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L5/00—Structural features of suction cleaners
- A47L5/12—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum
- A47L5/22—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum with rotary fans
- A47L5/36—Suction cleaners with hose between nozzle and casing; Suction cleaners for fixing on staircases; Suction cleaners for carrying on the back
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
- A47L9/0081—Means for exhaust-air diffusion; Means for sound or vibration damping
Definitions
- the present invention relates to a backpack blower in which a blower is mounted on a backpack frame.
- Backpack blowers are machines that are suitable for blowing cut grass or fallen leaves.
- noise is generated by various causes; one such cause is the air intake noise of the blower that is mounted on the backpack frame. Naturally, it is desirable that this air intake noise be as small as possible.
- the present invention employs a construction that is distinguished from the conventional technique described above in order to achieve a great reduction in air intake noise.
- the backpack blower comprises a blower which has an air intake opening, a backpack frame which is used to support the blower on the back of a user, and a back pad that is coupled to the backpack frame and contacts the back of the user.
- the back pad is composed of a cushion material.
- the back pad comprises a back surface contacting the back of the user and a surface (hereinafter referred to as “opposite surface”) opposite the back surface.
- the air intake opening communicates with at least a portion of the opposite surface, so that the air intake noise of the blower can reach at least the portion of the opposite surface.
- at least a portion of the opposite surface faces the air intake opening and communicates with the air intake opening.
- the back pad absorbs the shock of the vibration and load that are transmitted to the back of the user from the backpack frame, and protects the user.
- the back pad also has a noise attenuating action. Specifically, the air intake noise of the blower reaches at least the portion of the opposite surface and is attenuated by the back pad composed of a cushion material. As a result, noise created by the operation of the blower is reduced.
- the back pad has a noise reducing action in addition to an intrinsic shock-absorbing action. Accordingly, the present invention has a rational construction with no waste.
- the backpack blower may have at least one partition between the air intake opening and the opposite surface, and this at least one partition may have numerous holes that allow the air intake noise of the blower to pass through.
- the air intake noise diffuses or expands immediately after passing through the numerous holes, thereby improving the noise eliminating effect.
- the intake and outlet of air is performed via the numerous holes, and the flow or air is adjusted. Consequently, the generation of noise is prevented.
- a first partition and second partition may be provided between the air intake opening and the opposite surface, and each of these partitions may have numerous holes that allow the air intake noise of the blower to pass through.
- the air intake noise diffuses or expands immediately after passing through the numerous holes in the first partition, and again diffuses or expands immediately after passing through the numerous holes in the second partition, thereby improving the noise eliminating effect.
- the at least one partition described above may be an air intake guide which has a smooth raised part oriented toward the air intake opening in the central part. In this case, since the partition has this raised part, the air intake efficiency of the blower is improved.
- the backpack blower may have a ventilation cover that prevents the intake of foreign matter into the air intake opening, and the ventilation cover and air intake guide may be formed as an integral unit. This facilities the installation and removal of the ventilation cover and air intake guide on or from the backpack blower.
- the unit described above may be supported on the backpack frame. If this is done, an attachment method can be used which is simpler than the method used in cases where the unit is supported on the blower. The reason for this is that the vibration of the backpack frame is far smaller than the vibration of the blower itself.
- the blower is a working member that generates noise
- the present invention can also be defined as a backpack working machine comprising a working member that generates noise, a backpack frame that is used to support this working member on the back of a user, and a back pad that is coupled to the backpack frame and contacts the back of the user, and is a pad that is composed of a cushion material and has a back surface contacting the back of the user and an opposite surface, wherein the working member communicates with at least a portion of the opposite surface so that noise generated by the working member is eliminated by the back pad.
- FIG. 1 is a perspective view showing the use state of the backpack blower according to one embodiment of the present invention
- FIG. 2 is a longitudinal sectional left side view of the central portion in the left-right direction of the main body part of the backpack blower shown in FIG. 1 ;
- FIG. 3 is a perspective view of the backpack frame and air intake assist unit shown in FIG. 2 ;
- FIG. 4 is a sectional view showing a modification of FIG. 2 .
- FIG. 1 depicts a backpack blower 1 suitable for blowing away fallen leaves L, cut branches and leaves, and the like.
- the backpack blower 1 of the present embodiment comprises a centrifugal blower 5 as a blower, and a backpack frame 4 that is used to support this blower 5 on the back of an operator U.
- the backpack frame 4 has a pair of backpack straps, i.e., left and right backpack straps 3 , 3 .
- an internal combustion engine 6 such as an air-cooled two-cycle gasoline engine or the like is mounted on the backpack frame 4 as a motor that is used to drive the blower 5 .
- An air discharge pipe 9 is connected to the air discharge opening 5 a of the blower 5 via an elbow pipe 7 and a bellows hose 8 .
- the operator or user U carries the backpack frame 4 on the back via the left and right backpack straps 3 , 3 , and grips a grip part 10 that is attached to the base end part of the air discharge pipe 9 . While controlling the orientation of the air discharge pipe 9 and the internal combustion engine 6 , the user can efficiently perform the work of blowing away fallen leaves L or the like by blowing a large quantity of air that is discharged from an air discharge opening 9 a at the tip end of the air discharge pipe 9 .
- the backpack frame 4 comprises a plate-form upright part 11 , and a plate-form seat part 12 that extends substantially horizontally to the rear of the worker U from the lower part of the upright part 11 .
- the backpack frame 4 is thus formed substantially in an L shape as seen in a left side view.
- the backpack frame 4 can be integrally formed by a method such as blow molding or the like using a plastic that has light weight and good durability.
- the backpack frame 4 may have ribs, indentations and projections in the manufactured structure, or the like for the purpose of reinforcement. In FIG. 3 , however, the backpack frame 4 is drawn with a simple shape in order to simplify the graphic representation.
- a blower unit 14 in which the blower 5 and internal combustion engine 6 are integrated, is supported in an anti-vibration manner on the backpack frame 4 .
- An anti-vibration member 15 composing compression coil springs, rubber blocks, or the like is disposed between the blower unit 14 and backpack frame 4 . Accordingly, the vibration that occurs during the operation of the blower unit 14 is not directly transmitted to the backpack frame 4 .
- the centrifugal fan 16 of the blower 5 is operatively connected to the output shaft 17 of the internal combustion engine 6 .
- the air intake opening 18 of the blower 5 faces the back surface 11 r of the upright part 11 with an air intake space S of specified dimensions provided therebetween.
- An intake air flow channel 19 is formed in the seat part 12 so that intake air from below can also be ensured by the blower 5 .
- a back pad 20 which contacts the back of the user U, is linked to the front surface 11 f of the upright part 11 .
- This back pad 20 is formed from a plate-form cushion material that has a good shock-absorbing and sound-absorbing properties.
- urethane foam formed by compression-molding expanded urethane can be used as the material of the back pad 20 .
- the back pad 20 comprises a back surface (front surface) 20 f contacting the back of the user U, and an opposite surface (rear surface) 20 r .
- a spacer part 21 which rises toward the upright part 11 , is around the periphery of the back pad 20
- a contact part 22 which contacts the upright part 11 , is formed around the entire circumference of the spacer part 21 .
- the contact part 22 is fastened to the upright part 11 . This fastening may be accomplished by fastening parts such as screws or the like, or may be accomplished by bonding using an adhesive agent.
- a space part (second space part described later) 23 is formed by the action of the spacer part 21 between the opposite surface 20 r and the front surface 11 f of the upright part 11 .
- the back pad 20 comprises a reinforcing spacer part 24 in a position on the lower part of the opposite surface 20 r .
- the reinforcing spacer part 24 protrudes to a position contacting the front surface 11 f of the upright part 11 , and is fastened to the front surface 11 f .
- the lower part of the back pad 20 is firmly pressed against the back of the worker U by the load of the backpack blower 1 .
- the installation position of the reinforcing spacer part 24 is a position that causes no blockage of numerous holes 26 in a second partition 25 described later, such as the left and right sides of the lower part of the opposite surface 20 r , or the like.
- An air intake guide 27 which is used to increase the efficiency of the intake of air into the air intake opening 18 , is attached to the backpack frame 4 . As will be described later, the air intake guide 27 also acts as a first partition that is used to reduce or eliminate noise.
- the air intake guide 27 is positioned between the opposite surface 20 r of the back pad 20 and the air intake opening 18 , and faces the air intake opening 18 .
- the air intake guide 27 comprises a smooth raised part 28 oriented toward the air intake opening 18 in the central part of a circular main body.
- a space part 29 which includes the second space part 23 , is disposed between the air intake guide 27 and the opposite surface 20 r of the back pad 20 .
- the air intake guide 27 may be configured with numerous holes (small holes) 30 that allow the air intake noise of the blower 5 to pass through.
- the size of each hole 30 is set at a size in which the air intake noise can be effectively reduced eliminated by being diffused or expanded immediately after passing through the hole 30 . It is desirable that each hole 30 has no corner portions and be configured in a circular, elliptical, or other non-covered shape.
- a plurality of claws 31 (only one is shown in FIG. 2 ) are formed on the front surface of the air intake guide 27 as attachment parts for attaching to the backpack frame 4 . These claws 31 engage with claw receiving holes 32 formed in the second partition 25 .
- the air intake guide 27 can be formed using a plastic.
- the second partition 25 used to reduce or eliminate noise is disposed between the air intake guide 27 and the opposite surface 20 r of the back pad 20 .
- the second partition 25 is formed in a circular shape with a small thickness in substantially the central portion of the upright part 11 as one part of the upright part 11 .
- the second partition 25 partitions the space part 29 between the air intake guide 27 and the back pad 20 into a first space part 33 on the side of the air intake guide 27 , and the second space part 23 on the side of the back pad 20 .
- the numerous holes (small holes) 26 that are used to allow the air intake noise of the blower 5 to pass through are formed in the second partition 25 . These holes 26 are formed in positions facing the numerous holes 30 formed in the air intake guide 27 .
- the size of each hole 26 is also set such that the air intake noise can be effectively reduced or eliminated by being diffused or expanded immediately after passing through the hole 26 .
- Each hole 26 is preferably round, elliptical, or of another non-cornered shape.
- a ring-form spacer 34 is integrally formed on the second partition 25 , on the surface located on the side of the air intake guide 27 .
- the air intake guide 27 is concentrically disposed on the ring-form spacer 34 , and is fastened to the second partition 25 .
- the ring-form spacer 34 defines the first space part 33 between the air intake guide 27 and the second partition 25 .
- the claw receiving holes 32 are disposed in the second partition 25 at intervals in the circumferential direction of the ring-form spacer 34 .
- the respective claws 31 of the air intake guide 27 engage with the respective claw receiving holes 32 .
- a collar-form grid 36 which has numerous ventilation holes 35 in the circumference, is disposed in the air intake space S.
- the collar-form grid 36 is a ventilation cover which is used to prevent foreign matter such as fallen leaves, small branches, or the like from being taken into the air intake opening 18 from the air intake space S.
- the collar-form grid 36 is disposed concentrically with the air intake opening 18 so that the ventilation holes 35 are positioned on the outside in the radial direction of the air intake opening 18 .
- the collar-form grid 36 can also be formed using a plastic.
- the air intake guide 27 and the collar-form grid 36 are formed as an integral unit, and are formed as an air intake assist unit 13 , as is shown in FIG. 3 . Accordingly, the work of attaching the collar-form grid 36 and air intake guide 27 to the backpack frame 4 is facilitated.
- the air intake guide 27 and collar-form grid 36 may be integrated by connecting separately formed parts, or may be formed as an integral unit from the beginning.
- the air intake assist unit 13 is supported on the backpack frame 4 .
- the air intake assist unit 13 can also be supported on the blower 5 .
- an attachment method can be used, that is simpler than the method used in cases where the unit is attached to the blower 5 . The reason is that the vibration of the backpack frame 4 is far smaller than the vibration of the blower 5 due to the action of the anti-vibration member 15 .
- fastening parts such as screws or bonding using an adhesive agent may be used in addition to the engagement of the claws 31 and the claw receiving holes 32 .
- the air intake opening 18 of the blower 5 and at least a portion of the opposite surface 20 r of the back pad 20 communicate with each other, so that the air intake noise of the blower 5 can reach at least the portion of the opposite surface 20 r .
- the air intake opening 18 communicates with at least the portion of the opposite surface 20 r via the air intake space S, the numerous holes 30 formed in the air intake guide (first partition) 27 , the first space part 33 , the numerous holes 26 formed in the second partition 25 , and the second space part 23 .
- the air intake noise of the blower 5 reaches at least the portion of the opposite surface 20 r via the first space part 33 and second space part 23 , and is attenuated or eliminated by the back pad 20 that comprises a cushion material. As a result, the noise generated by the operation of the blower 5 is reduced.
- the back pad 20 absorbs the shock of the vibration or load that is transmitted to the back of the user U from the side of the backpack frame 4 , and protects the user U.
- the back pad 20 also has the action of causing attenuation of the noise. Accordingly, there is no need to install a special sound-absorbing material in addition to the back pad 20 ; consequently, the backpack blower is rational, with no waste in the construction, and reduction in cost.
- the air intake guide 27 used as a first partition, and the second partition 25 also have a noise reducing or eliminating functionality, so that the noise-attenuating effect is greatly improved.
- the air intake noise of the blower 5 is caused to diffuse or expand by the first space part 33 immediately after passing through the numerous holes (small holes) 30 of the air intake guide 27 .
- the noise is first attenuated at this point in time.
- the air intake noise is caused to expand by the second space part 23 immediately after passing through the numerous holes 26 of the second partition 25 ; accordingly, the noise is further attenuated at this point in time.
- the air intake noise that is thus attenuated at a plurality of stages is finally absorbed by the back pad 20 . If necessary, the expansion and flow adjustment of the air intake noise can be repeated a number of times by increasing the partitioning of the space part 29 which in turn would provide a greater noise reducing or eliminating effect.
- the numerous holes 30 and 26 are formed in the air intake guide 27 and second partition 25 , the following advantage is obtained: namely, even in cases where air pressure fluctuations occur in the air that is taken in from the air intake opening 18 , the intake and outlet of air is performed by the numerous holes 30 and 26 , the flow is adjusted, and the generation of noise is prevented.
- FIG. 4 shows a modification of FIG. 2 .
- the first difference from the example shown in FIG. 2 is that the second partition 25 is eliminated.
- an opening 40 that is larger than the air intake opening 18 of the blower 5 is formed concentrically in a position facing the air intake opening 18 .
- only an air intake guide 41 is present as a first partition for partitioning between the air intake opening 18 and the back pad 20 .
- a space part 42 is present between the air intake guide 41 and the opposite surface 20 r of the back pad 20 .
- the air intake guide 41 has a smooth raised part 39 oriented toward the air intake opening 18 in the central portion, and has numerous noise-eliminating holes (small holes) 43 that allow the air intake noise to pass through.
- the air intake opening 18 communicates with at least a portion of the opposite surface 20 r via the numerous holes 43 formed in the air intake guide 41 , and the space part 42 . Accordingly, the air intake noise of the blower 5 reaches at least the portion of the opposite surface 20 r via the numerous holes 43 and space part 42 , and is attenuated by the back pad 20 that comprises a cushion material. As a result, the noise that is generated by the blower 5 is reduced. Since the air intake noise is caused to diffuse or expand by the space part 42 immediately after passing through numerous holes 43 , the noise reducing or eliminating effect is greatly improved.
- this embodiment includes an air intake assist unit 45 in which the air intake guide 41 and collar-form grid 44 are integrated is supported on a volute case 46 of the blower 5 .
- insertion parts 47 for fastening screws 48 are integrally formed in the collar-form grid 44 .
- female screw holes 49 which receive the fastening screws 48 are formed in the volute case 46 .
- the shape of the collar-form grid 44 also differs from that used in the previous embodiment of FIG. 2 .
- an advantage of the present invention is the provision of air intake noise attenuating properties in a backpack blower configuration that has been conventionally used to protect users from vibration. Furthermore, another feature is the provision of at least one partition having numerous holes with noise-eliminating effect, and, if possible, a plurality of such partitions, are disposed between the air intake opening and the back pad.
- the blower 5 may be defined as a working member that generates noise; so that the present invention may be defined as a backpack working machine comprising a working member 5 that generates noise, a backpack frame 4 that is used to support the working member 5 on the back of a user U, a back pad 20 that is coupled to the backpack frame 4 and contacts the back of the user U, and is composed of a cushion material and has a back surface 20 f and an opposite surface 20 r , wherein the working member 5 communicates with at least a portion of the opposite surface 20 r so that the noise generated by the working member 5 is attenuated by the back pad 20 .
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Cleaning Of Streets, Tracks, Or Beaches (AREA)
Abstract
A backpack blower comprising a blower which has an air intake opening, a backpack frame which is used to support the blower on the back of a user, and a back pad that is coupled to the backpack frame and contacts the back of the user. The back pad is composed of a cushion material and has a back surface contacting the back of the user and an opposite surface. The air intake opening communicates with at least a portion of the opposite surface, so that the air intake noise of the blower can reach at least the portion of the opposite surface.
Description
- 1. Field of the Invention
- The present invention relates to a backpack blower in which a blower is mounted on a backpack frame. This application claims priority to Japanese Patent Application No. 2006-171065, filed Jun. 21, 2006, the entire contents of which is hereby incorporated by references.
- 2. Description of the Related Art
- Backpack blowers are machines that are suitable for blowing cut grass or fallen leaves. During the operation of a backpack blower, noise is generated by various causes; one such cause is the air intake noise of the blower that is mounted on the backpack frame. Naturally, it is desirable that this air intake noise be as small as possible.
- Accordingly, a technique has been proposed for the purpose of reducing the air intake noise (see US-2002-0060107-A1) in which a hollow space is formed in the backpack frame, and small holes are formed in a wall that constitutes the hollow space and that faces the air intake opening of the blower.
- The present invention employs a construction that is distinguished from the conventional technique described above in order to achieve a great reduction in air intake noise.
- In the embodiment of the present invention, the backpack blower comprises a blower which has an air intake opening, a backpack frame which is used to support the blower on the back of a user, and a back pad that is coupled to the backpack frame and contacts the back of the user. The back pad is composed of a cushion material. The back pad comprises a back surface contacting the back of the user and a surface (hereinafter referred to as “opposite surface”) opposite the back surface. Here, the air intake opening communicates with at least a portion of the opposite surface, so that the air intake noise of the blower can reach at least the portion of the opposite surface. As such, at least a portion of the opposite surface faces the air intake opening and communicates with the air intake opening.
- In the present invention, the back pad absorbs the shock of the vibration and load that are transmitted to the back of the user from the backpack frame, and protects the user. In addition, the back pad also has a noise attenuating action. Specifically, the air intake noise of the blower reaches at least the portion of the opposite surface and is attenuated by the back pad composed of a cushion material. As a result, noise created by the operation of the blower is reduced. In the present invention, the back pad has a noise reducing action in addition to an intrinsic shock-absorbing action. Accordingly, the present invention has a rational construction with no waste.
- In one embodiment, the backpack blower may have at least one partition between the air intake opening and the opposite surface, and this at least one partition may have numerous holes that allow the air intake noise of the blower to pass through. In this case, the air intake noise diffuses or expands immediately after passing through the numerous holes, thereby improving the noise eliminating effect. Furthermore, even in cases where a fluctuation in air pressure is generated in the air that is taken in from the air intake opening, the intake and outlet of air is performed via the numerous holes, and the flow or air is adjusted. Consequently, the generation of noise is prevented.
- In another embodiment, a first partition and second partition may be provided between the air intake opening and the opposite surface, and each of these partitions may have numerous holes that allow the air intake noise of the blower to pass through. In this case, the air intake noise diffuses or expands immediately after passing through the numerous holes in the first partition, and again diffuses or expands immediately after passing through the numerous holes in the second partition, thereby improving the noise eliminating effect.
- In one embodiment, the at least one partition described above may be an air intake guide which has a smooth raised part oriented toward the air intake opening in the central part. In this case, since the partition has this raised part, the air intake efficiency of the blower is improved.
- In one embodiment, the backpack blower may have a ventilation cover that prevents the intake of foreign matter into the air intake opening, and the ventilation cover and air intake guide may be formed as an integral unit. This facilities the installation and removal of the ventilation cover and air intake guide on or from the backpack blower.
- In one embodiment, the unit described above may be supported on the backpack frame. If this is done, an attachment method can be used which is simpler than the method used in cases where the unit is supported on the blower. The reason for this is that the vibration of the backpack frame is far smaller than the vibration of the blower itself.
- Furthermore, since the blower is a working member that generates noise, the present invention can also be defined as a backpack working machine comprising a working member that generates noise, a backpack frame that is used to support this working member on the back of a user, and a back pad that is coupled to the backpack frame and contacts the back of the user, and is a pad that is composed of a cushion material and has a back surface contacting the back of the user and an opposite surface, wherein the working member communicates with at least a portion of the opposite surface so that noise generated by the working member is eliminated by the back pad.
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FIG. 1 is a perspective view showing the use state of the backpack blower according to one embodiment of the present invention; -
FIG. 2 is a longitudinal sectional left side view of the central portion in the left-right direction of the main body part of the backpack blower shown inFIG. 1 ; -
FIG. 3 is a perspective view of the backpack frame and air intake assist unit shown inFIG. 2 ; and -
FIG. 4 is a sectional view showing a modification ofFIG. 2 . - Embodiments of the present invention will be described below with reference to the attached figures.
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FIG. 1 depicts abackpack blower 1 suitable for blowing away fallen leaves L, cut branches and leaves, and the like. - The
backpack blower 1 of the present embodiment comprises acentrifugal blower 5 as a blower, and abackpack frame 4 that is used to support thisblower 5 on the back of an operator U. Thebackpack frame 4 has a pair of backpack straps, i.e., left andright backpack straps internal combustion engine 6 such as an air-cooled two-cycle gasoline engine or the like is mounted on thebackpack frame 4 as a motor that is used to drive theblower 5. An air discharge pipe 9 is connected to the air discharge opening 5a of theblower 5 via anelbow pipe 7 and abellows hose 8. - The operator or user U carries the
backpack frame 4 on the back via the left andright backpack straps grip part 10 that is attached to the base end part of the air discharge pipe 9. While controlling the orientation of the air discharge pipe 9 and theinternal combustion engine 6, the user can efficiently perform the work of blowing away fallen leaves L or the like by blowing a large quantity of air that is discharged from an air discharge opening 9 a at the tip end of the air discharge pipe 9. - As shown in
FIGS. 2 and 3 , thebackpack frame 4 comprises a plate-formupright part 11, and a plate-form seat part 12 that extends substantially horizontally to the rear of the worker U from the lower part of theupright part 11. Thebackpack frame 4 is thus formed substantially in an L shape as seen in a left side view. For example, thebackpack frame 4 can be integrally formed by a method such as blow molding or the like using a plastic that has light weight and good durability. Furthermore, thebackpack frame 4 may have ribs, indentations and projections in the manufactured structure, or the like for the purpose of reinforcement. InFIG. 3 , however, thebackpack frame 4 is drawn with a simple shape in order to simplify the graphic representation. - As better seen in
FIG. 2 , ablower unit 14, in which theblower 5 andinternal combustion engine 6 are integrated, is supported in an anti-vibration manner on thebackpack frame 4. Ananti-vibration member 15 composing compression coil springs, rubber blocks, or the like is disposed between theblower unit 14 andbackpack frame 4. Accordingly, the vibration that occurs during the operation of theblower unit 14 is not directly transmitted to thebackpack frame 4. In theblower unit 14, thecentrifugal fan 16 of theblower 5 is operatively connected to theoutput shaft 17 of theinternal combustion engine 6. The air intake opening 18 of theblower 5 faces the back surface 11 r of theupright part 11 with an air intake space S of specified dimensions provided therebetween. An intakeair flow channel 19 is formed in theseat part 12 so that intake air from below can also be ensured by theblower 5. - A
back pad 20, which contacts the back of the user U, is linked to thefront surface 11 f of theupright part 11. Thisback pad 20 is formed from a plate-form cushion material that has a good shock-absorbing and sound-absorbing properties. For example, urethane foam formed by compression-molding expanded urethane can be used as the material of theback pad 20. - The
back pad 20 comprises a back surface (front surface) 20f contacting the back of the user U, and an opposite surface (rear surface) 20 r. Aspacer part 21, which rises toward theupright part 11, is around the periphery of theback pad 20, and acontact part 22, which contacts theupright part 11, is formed around the entire circumference of thespacer part 21. In theback pad 20, mainly thecontact part 22 is fastened to theupright part 11. This fastening may be accomplished by fastening parts such as screws or the like, or may be accomplished by bonding using an adhesive agent. In the state in which theback pad 20 is attached to theupright part 11, a space part (second space part described later) 23 is formed by the action of thespacer part 21 between theopposite surface 20 r and thefront surface 11 f of theupright part 11. - The
back pad 20 comprises a reinforcingspacer part 24 in a position on the lower part of theopposite surface 20 r. The reinforcingspacer part 24 protrudes to a position contacting thefront surface 11 f of theupright part 11, and is fastened to thefront surface 11 f. When the user U carries the main body part of thebackpack blower 1 on the back, the lower part of theback pad 20 is firmly pressed against the back of the worker U by the load of thebackpack blower 1. However, by virtue of providing of the reinforcingspacer part 24, there is no crushing of thesecond space part 23. For example, the installation position of the reinforcingspacer part 24 is a position that causes no blockage ofnumerous holes 26 in asecond partition 25 described later, such as the left and right sides of the lower part of theopposite surface 20 r, or the like. - An
air intake guide 27, which is used to increase the efficiency of the intake of air into theair intake opening 18, is attached to thebackpack frame 4. As will be described later, theair intake guide 27 also acts as a first partition that is used to reduce or eliminate noise. Theair intake guide 27 is positioned between theopposite surface 20 r of theback pad 20 and theair intake opening 18, and faces theair intake opening 18. Theair intake guide 27 comprises a smooth raisedpart 28 oriented toward theair intake opening 18 in the central part of a circular main body. Aspace part 29, which includes thesecond space part 23, is disposed between theair intake guide 27 and theopposite surface 20 r of theback pad 20. - Furthermore, the
air intake guide 27 may be configured with numerous holes (small holes) 30 that allow the air intake noise of theblower 5 to pass through. The size of eachhole 30 is set at a size in which the air intake noise can be effectively reduced eliminated by being diffused or expanded immediately after passing through thehole 30. It is desirable that eachhole 30 has no corner portions and be configured in a circular, elliptical, or other non-covered shape. A plurality of claws 31 (only one is shown inFIG. 2 ) are formed on the front surface of theair intake guide 27 as attachment parts for attaching to thebackpack frame 4. Theseclaws 31 engage withclaw receiving holes 32 formed in thesecond partition 25. Theair intake guide 27 can be formed using a plastic. - The
second partition 25 used to reduce or eliminate noise is disposed between theair intake guide 27 and theopposite surface 20 r of theback pad 20. Thesecond partition 25 is formed in a circular shape with a small thickness in substantially the central portion of theupright part 11 as one part of theupright part 11. Thesecond partition 25 partitions thespace part 29 between theair intake guide 27 and theback pad 20 into afirst space part 33 on the side of theair intake guide 27, and thesecond space part 23 on the side of theback pad 20. The numerous holes (small holes) 26 that are used to allow the air intake noise of theblower 5 to pass through are formed in thesecond partition 25. Theseholes 26 are formed in positions facing thenumerous holes 30 formed in theair intake guide 27. The size of eachhole 26 is also set such that the air intake noise can be effectively reduced or eliminated by being diffused or expanded immediately after passing through thehole 26. Eachhole 26 is preferably round, elliptical, or of another non-cornered shape. - As shown in
FIG. 3 , a ring-form spacer 34 is integrally formed on thesecond partition 25, on the surface located on the side of theair intake guide 27. Theair intake guide 27 is concentrically disposed on the ring-form spacer 34, and is fastened to thesecond partition 25. The ring-form spacer 34 defines thefirst space part 33 between theair intake guide 27 and thesecond partition 25. Theclaw receiving holes 32 are disposed in thesecond partition 25 at intervals in the circumferential direction of the ring-form spacer 34. Therespective claws 31 of theair intake guide 27 engage with the respective claw receiving holes 32. - As shown in
FIG. 2 , a collar-form grid 36, which has numerous ventilation holes 35 in the circumference, is disposed in the air intake space S. The collar-form grid 36 is a ventilation cover which is used to prevent foreign matter such as fallen leaves, small branches, or the like from being taken into theair intake opening 18 from the air intake space S. The collar-form grid 36 is disposed concentrically with theair intake opening 18 so that the ventilation holes 35 are positioned on the outside in the radial direction of theair intake opening 18. The collar-form grid 36 can also be formed using a plastic. - In the present embodiment, the
air intake guide 27 and the collar-form grid 36 are formed as an integral unit, and are formed as an air intake assistunit 13, as is shown inFIG. 3 . Accordingly, the work of attaching the collar-form grid 36 andair intake guide 27 to thebackpack frame 4 is facilitated. Theair intake guide 27 and collar-form grid 36 may be integrated by connecting separately formed parts, or may be formed as an integral unit from the beginning. - In the present embodiment, the air intake assist
unit 13 is supported on thebackpack frame 4. Conversely, the air intake assistunit 13 can also be supported on theblower 5. However, if the air intake assistunit 13 is supported on thebackpack frame 4, an attachment method can be used, that is simpler than the method used in cases where the unit is attached to theblower 5. The reason is that the vibration of thebackpack frame 4 is far smaller than the vibration of theblower 5 due to the action of theanti-vibration member 15. - Furthermore, in regard to the method used to attach the air intake assist
unit 13 to thebackpack frame 4, fastening parts such as screws or bonding using an adhesive agent may be used in addition to the engagement of theclaws 31 and the claw receiving holes 32. - In the
backpack blower 1, as is shown inFIG. 2 , theair intake opening 18 of theblower 5 and at least a portion of theopposite surface 20 r of theback pad 20 communicate with each other, so that the air intake noise of theblower 5 can reach at least the portion of theopposite surface 20 r. In concrete terms, theair intake opening 18 communicates with at least the portion of theopposite surface 20 r via the air intake space S, thenumerous holes 30 formed in the air intake guide (first partition) 27, thefirst space part 33, thenumerous holes 26 formed in thesecond partition 25, and thesecond space part 23. Accordingly, the air intake noise of theblower 5 reaches at least the portion of theopposite surface 20 r via thefirst space part 33 andsecond space part 23, and is attenuated or eliminated by theback pad 20 that comprises a cushion material. As a result, the noise generated by the operation of theblower 5 is reduced. - Moreover, the
back pad 20 absorbs the shock of the vibration or load that is transmitted to the back of the user U from the side of thebackpack frame 4, and protects the user U. In addition, theback pad 20 also has the action of causing attenuation of the noise. Accordingly, there is no need to install a special sound-absorbing material in addition to theback pad 20; consequently, the backpack blower is rational, with no waste in the construction, and reduction in cost. - For the present embodiment, in addition to the sound-absorbing action of the
back pad 20, theair intake guide 27 used as a first partition, and thesecond partition 25, also have a noise reducing or eliminating functionality, so that the noise-attenuating effect is greatly improved. In concrete terms, the air intake noise of theblower 5 is caused to diffuse or expand by thefirst space part 33 immediately after passing through the numerous holes (small holes) 30 of theair intake guide 27. As such, the noise is first attenuated at this point in time. Furthermore, the air intake noise is caused to expand by thesecond space part 23 immediately after passing through thenumerous holes 26 of thesecond partition 25; accordingly, the noise is further attenuated at this point in time. The air intake noise that is thus attenuated at a plurality of stages is finally absorbed by theback pad 20. If necessary, the expansion and flow adjustment of the air intake noise can be repeated a number of times by increasing the partitioning of thespace part 29 which in turn would provide a greater noise reducing or eliminating effect. - Furthermore, in the present embodiment, since the
numerous holes air intake guide 27 andsecond partition 25, the following advantage is obtained: namely, even in cases where air pressure fluctuations occur in the air that is taken in from theair intake opening 18, the intake and outlet of air is performed by thenumerous holes -
FIG. 4 shows a modification ofFIG. 2 . Here, the first difference from the example shown inFIG. 2 is that thesecond partition 25 is eliminated. Specifically, in theupright part 11 of thebackpack frame 4, anopening 40 that is larger than theair intake opening 18 of theblower 5 is formed concentrically in a position facing theair intake opening 18. In this case, only anair intake guide 41 is present as a first partition for partitioning between theair intake opening 18 and theback pad 20. A space part 42 is present between theair intake guide 41 and theopposite surface 20 r of theback pad 20. As in the example shown inFIG. 2 , theair intake guide 41 has a smooth raised part 39 oriented toward theair intake opening 18 in the central portion, and has numerous noise-eliminating holes (small holes) 43 that allow the air intake noise to pass through. - In the embodiment shown in
FIG. 4 , theair intake opening 18 communicates with at least a portion of theopposite surface 20 r via thenumerous holes 43 formed in theair intake guide 41, and the space part 42. Accordingly, the air intake noise of theblower 5 reaches at least the portion of theopposite surface 20 r via thenumerous holes 43 and space part 42, and is attenuated by theback pad 20 that comprises a cushion material. As a result, the noise that is generated by theblower 5 is reduced. Since the air intake noise is caused to diffuse or expand by the space part 42 immediately after passing throughnumerous holes 43, the noise reducing or eliminating effect is greatly improved. - Furthermore, this embodiment includes an air intake assist
unit 45 in which theair intake guide 41 and collar-form grid 44 are integrated is supported on avolute case 46 of theblower 5. In order to allow attachment to thevolute case 46,insertion parts 47 forfastening screws 48 are integrally formed in the collar-form grid 44. In correspondence with these, female screw holes 49 which receive the fastening screws 48 are formed in thevolute case 46. Furthermore, the shape of the collar-form grid 44 also differs from that used in the previous embodiment ofFIG. 2 . - As is clear from the above embodiments, an advantage of the present invention is the provision of air intake noise attenuating properties in a backpack blower configuration that has been conventionally used to protect users from vibration. Furthermore, another feature is the provision of at least one partition having numerous holes with noise-eliminating effect, and, if possible, a plurality of such partitions, are disposed between the air intake opening and the back pad.
- Although embodiments of the apparatus embodying the present invention have been depicted and disclosed in the foregoing detailed description, it will be appreciated that the present invention is not limited to the disclosed embodiments and the modifications are possible without departing from the spirit and scope of the invention as set forth and defined by the attached claims.
- For example, the
blower 5 may be defined as a working member that generates noise; so that the present invention may be defined as a backpack working machine comprising a workingmember 5 that generates noise, abackpack frame 4 that is used to support the workingmember 5 on the back of a user U, aback pad 20 that is coupled to thebackpack frame 4 and contacts the back of the user U, and is composed of a cushion material and has aback surface 20f and anopposite surface 20 r, wherein the workingmember 5 communicates with at least a portion of theopposite surface 20 r so that the noise generated by the workingmember 5 is attenuated by theback pad 20.
Claims (13)
1. A backpack blower comprising:
a blower having an air intake opening;
a backpack frame configured to support the blower on the back of a user; and
a back pad that is coupled to the backpack frame and is configured to contact the back of the user, the back pad comprising a cushion material and having a back surface contacting the back of the user and an opposite surface,
wherein the air intake opening communicates with at least a portion of the opposite surface so that the air intake noise of the blower can reach at least the portion of the opposite surface.
2. The backpack blower according to claim 1 , wherein
at least one partition is disposed between the air intake opening and the opposite surface; and
the at least one partition has numerous holes that allow the air intake noise of the blower to pass through.
3. The backpack blower according to claim 1 , wherein
a first partition and a second partition are disposed between the air intake opening and the opposite surface; and
each of the partitions includes numerous holes that allow the air intake noise of the blower to pass through.
4. The backpack blower according to claim 2 , wherein the at least one partition is an air intake guide which has a smooth raised part oriented toward the air intake opening in the central part.
5. The backpack blower according to claim 4 , comprising a ventilation cover which prevents foreign matter from being taken into the air intake opening, wherein the ventilation cover and the air intake guide are formed as an integral unit.
6. The backpack blower according to claim 5 , wherein the unit is supported on the backpack frame.
7. A backpack blower comprising:
a blower having an air intake opening;
a backpack frame configured to support the blower on the back of a user; and
a back pad that is coupled to the backpack frame and is configured to contact the back of the user, the back pad being composed of a cushion material and having a back surface contacting the back of the user and an opposite surface,
wherein at least a portion of the opposite surface faces the air intake opening and communicates with the air intake opening.
8. The backpack blower according to claim 7 , comprising at least one partition between the air intake opening and opposite surface, wherein the at least one partition has numerous holes that allow the air intake noise of the blower to pass through.
9. The backpack blower according to claim 7 , wherein
a first partition and a second partition are disposed between the air intake opening and the opposite surface; and
each of the partitions includes numerous holes that allow the air intake noise of the blower to pass through.
10. The backpack blower according to claim 8 , wherein the at least one partition is an air intake guide which has a smooth raised part oriented toward the air intake opening in the central part.
11. The backpack blower according to claim 10 , comprising a ventilation cover which prevents foreign matter from being taken into the air intake opening, wherein the ventilation cover and the air intake guide are formed as an integral unit.
12. The backpack blower according to claim 11 , wherein the unit is supported on the backpack frame.
13. A backpack working machine comprising:
a working member that generates noise;
a backpack frame which is used to support the working member on the back of a user; and
a back pad that is coupled to the backpack frame and is configured to contact the back of the user, and is a pad that is composed of a cushion material and has a back surface contacting the back of the user and an opposite surface,
wherein the working member communicates with at least a portion of the opposite surface so that the noise generated by the working member is attenuated by the back pad.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006-171065 | 2006-06-21 | ||
JP2006171065A JP2008002310A (en) | 2006-06-21 | 2006-06-21 | Back carrying type blower |
Publications (1)
Publication Number | Publication Date |
---|---|
US20070294855A1 true US20070294855A1 (en) | 2007-12-27 |
Family
ID=38872234
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/808,889 Abandoned US20070294855A1 (en) | 2006-06-21 | 2007-06-13 | Backpack blower |
Country Status (2)
Country | Link |
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US (1) | US20070294855A1 (en) |
JP (1) | JP2008002310A (en) |
Cited By (17)
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US20110056047A1 (en) * | 2009-09-08 | 2011-03-10 | Harald Schliemann | Back carried work apparatus |
CN102102683A (en) * | 2009-12-18 | 2011-06-22 | 株式会社牧田 | Backpack power tool |
US20130061419A1 (en) * | 2010-08-26 | 2013-03-14 | Richard B. Patrono | Propane vacuum |
EP2684446A3 (en) * | 2012-07-09 | 2014-03-05 | Techtronic Outdoor Products Technology Limited | Backpack leaf blower |
US20150020345A1 (en) * | 2013-07-17 | 2015-01-22 | Tacony Corporation | Wearer Comfort Backpack Vacuum |
US20160108924A1 (en) * | 2014-10-17 | 2016-04-21 | Mean Green Products, LLC | Battery-powered, low-noise backpack blower |
USD806330S1 (en) * | 2015-09-08 | 2017-12-26 | Maruyama Mfg. Co., Inc. | Backpack blower |
US9854746B2 (en) * | 2016-04-27 | 2018-01-02 | Andreas Stihl Ag & Co. Kg | Backpack power tool with a drive motor and a blower driven by the drive motor |
EP3479680A1 (en) | 2017-11-02 | 2019-05-08 | Carl Pickett | Vented backpack blower |
US10327392B2 (en) | 2014-11-05 | 2019-06-25 | Mean Green Products, LLC | Battery-powered debris blower |
US11032973B2 (en) | 2019-07-26 | 2021-06-15 | Generac Power Systems, Inc. | Battery-operated electric mower |
US11156224B2 (en) | 2017-10-10 | 2021-10-26 | Tti (Macao Commercial Offshore) Limited | Backpack blower |
US11434929B2 (en) | 2019-08-02 | 2022-09-06 | Techtronic Cordless Gp | Blowers having noise reduction features |
US11690318B2 (en) | 2018-10-17 | 2023-07-04 | Generac Power Systems, Inc. | Deck height control system |
US11778960B2 (en) | 2020-01-21 | 2023-10-10 | Techtronic Cordless Gp | Blowers |
US11817073B2 (en) | 2020-01-21 | 2023-11-14 | Techtronic Cordless Gp | Power tool having noise reduction features |
US11889794B2 (en) | 2020-12-30 | 2024-02-06 | Milwaukee Electric Tool Corporation | Handheld blower |
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JP2010133376A (en) * | 2008-12-08 | 2010-06-17 | Husqvarna Zenoah Co Ltd | Backpack type working machine |
JP5464687B2 (en) * | 2009-03-03 | 2014-04-09 | ナブテスコオートモーティブ株式会社 | Compressed air dryer |
CN102482856B (en) | 2009-08-03 | 2015-07-22 | 富世华智诺株式会社 | Engine blower |
CN102251977B (en) * | 2011-08-24 | 2013-01-16 | 张家港施亿百机电设备有限公司 | External tilting centrifugal fan |
JP6253088B2 (en) | 2013-10-25 | 2017-12-27 | 株式会社マキタ | Back working machine |
JP6180879B2 (en) * | 2013-10-25 | 2017-08-16 | 株式会社マキタ | Back blower |
JP2016078005A (en) * | 2014-10-21 | 2016-05-16 | 株式会社マキタ | Blowing implement |
US20210270291A1 (en) * | 2016-09-30 | 2021-09-02 | Koki Holdings Co., Ltd. | Blower |
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Cited By (24)
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US20110056047A1 (en) * | 2009-09-08 | 2011-03-10 | Harald Schliemann | Back carried work apparatus |
CN102011371A (en) * | 2009-09-08 | 2011-04-13 | 安德烈亚斯.斯蒂尔两合公司 | Back carried work apparatus |
CN102102683A (en) * | 2009-12-18 | 2011-06-22 | 株式会社牧田 | Backpack power tool |
US20110146023A1 (en) * | 2009-12-18 | 2011-06-23 | Makita Corporation | Backpack power tool |
US20130061419A1 (en) * | 2010-08-26 | 2013-03-14 | Richard B. Patrono | Propane vacuum |
EP2684446A3 (en) * | 2012-07-09 | 2014-03-05 | Techtronic Outdoor Products Technology Limited | Backpack leaf blower |
US10306843B2 (en) | 2012-07-09 | 2019-06-04 | Techtronic Outdoor Products Technology Limited | Backpack leaf blower |
US9167751B2 (en) | 2012-07-09 | 2015-10-27 | Techtronic Outdoor Products Technology Limited | Backpack leaf blower |
US20150020345A1 (en) * | 2013-07-17 | 2015-01-22 | Tacony Corporation | Wearer Comfort Backpack Vacuum |
US9486120B2 (en) * | 2013-07-17 | 2016-11-08 | Tacony Corporation | Wearer comfort backpack vacuum |
US20160108924A1 (en) * | 2014-10-17 | 2016-04-21 | Mean Green Products, LLC | Battery-powered, low-noise backpack blower |
US10327392B2 (en) | 2014-11-05 | 2019-06-25 | Mean Green Products, LLC | Battery-powered debris blower |
USD806330S1 (en) * | 2015-09-08 | 2017-12-26 | Maruyama Mfg. Co., Inc. | Backpack blower |
US9854746B2 (en) * | 2016-04-27 | 2018-01-02 | Andreas Stihl Ag & Co. Kg | Backpack power tool with a drive motor and a blower driven by the drive motor |
US11156224B2 (en) | 2017-10-10 | 2021-10-26 | Tti (Macao Commercial Offshore) Limited | Backpack blower |
EP3479680A1 (en) | 2017-11-02 | 2019-05-08 | Carl Pickett | Vented backpack blower |
US10555646B2 (en) | 2017-11-02 | 2020-02-11 | Carl Pickett | Vented backpack blower |
US11690318B2 (en) | 2018-10-17 | 2023-07-04 | Generac Power Systems, Inc. | Deck height control system |
US11032973B2 (en) | 2019-07-26 | 2021-06-15 | Generac Power Systems, Inc. | Battery-operated electric mower |
US11434929B2 (en) | 2019-08-02 | 2022-09-06 | Techtronic Cordless Gp | Blowers having noise reduction features |
US11841023B2 (en) | 2019-08-02 | 2023-12-12 | Techtronic Cordless Gp | Blowers having noise reduction features |
US11778960B2 (en) | 2020-01-21 | 2023-10-10 | Techtronic Cordless Gp | Blowers |
US11817073B2 (en) | 2020-01-21 | 2023-11-14 | Techtronic Cordless Gp | Power tool having noise reduction features |
US11889794B2 (en) | 2020-12-30 | 2024-02-06 | Milwaukee Electric Tool Corporation | Handheld blower |
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Owner name: KIORITZ CORPORATION, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:IIDA, GIICHI;TSUTSUI, NAOSHI;TAKANO, MASAYUKI;REEL/FRAME:019737/0497 Effective date: 20070806 |
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Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |