• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present disclosure relates to an engine-driven tool (1) comprising a rotatable work tool (2), an engine (4) that is arranged to propel the rotatable work tool (2), a shielding cover (8) for shielding the rotatable work tool (2), and a dust channel (11) that is formed between the shielding cover (8) and the rotatable work tool (2). A dust hose (14) is arranged to connect the dust channel (11) to a dust container (17) and an electrically driven fan (16) that is arranged to convey air from the dust channel (11) into the dust container (17) via the dust hose (14). The engine-driven tool (1) comprises an electrical generator (18) that is electrically connectable to the fan motor (26) and is arranged to be at least indirectly driven by the engine (4). The electrical generator (18) is furthermore arranged to generate an electrical current when driven, where said electrical current at least indirectly is arranged to propel the fan motor (26).
    公开号:SE1651452A1
    申请号:SE1651452
    申请日:2016-11-03
    公开日:2018-03-13
    发明作者:Karlsson Fredrik
    申请人:Husqvarna Ab；
    IPC主号:
    专利说明:

    TITLE A dust removal arrangement for an engine-driven tool TECHNICAL FIELD The present disclosure relates to an engine-driven tool comprising a rotatable worktool, an engine that is arranged to propel the rotatable work tool, a shielding cover thatis arranged to shield a part of the rotatable work tool, and a dust channel that is formedbetween the shielding cover and the rotatable work tool. A dust hose is arranged to atleast indirectly connect the dust channel to a dust container and an electrically drivenfan that is arranged to convey air from the dust channel into the dust container.
    BACKG FlOUND Many motor tools such as engine-driven handheld cutting machines have saw bladeswhich may be circular or ring-shaped. Such a cutting machine may be used for cuttinghard materials such as concrete or rock, where the cutting procedure may result in thecreation of dust. For example concrete dust is unhealthy to breathe and also impairsvisions, and it is desired to minimize the creations of such dust that freely may expandin the air. Such free concrete dust that finds its way into the engine of the tool drasticallyaffects the engine in a negative way, may cause undesirable health effects and generally pollutes the environment.
    Many tools of the above type or for this purpose equipped with a water supply, wherea flow of water is directed towards the saw blade in such a way that a large quantity ofthe dust is mixed with the water and thus retained and kept from expanding in the air.
    The flow of water is preferably held at a minimum while maintaining a proper function,since the water normally has to be taken care of at the working site, more water thannecessary is undesirable. At some working sites, a demand for cleanliness, or shortageof water, results in that such a water supply is undesired. For this purpose, many typesof dust removal systems of vacuum cleaner type have been developed. Some of themhave an integrated fan motor for propelling air into a dust hose that guides undesireddust particles to a remote dust container. Others have an electrical fan motorpositioned at such a remote dust container, where the fan motor then is connected toa suitable power outlet.
    There is, however, a desire for a less complicated and versatile dust removalarrangement for an engine-driven tool such as a power cutter.
    SUMMARYThe object of the present disclosure is to provide a dust removal arrangement for anengine-driven tool that is less complicated and versatile compared to prior art.
    This object is achieved by means of an engine-driven tool comprising a rotatable worktool, an engine that is arranged to propel the rotatable work tool, a shielding cover thatis arranged to shield a part of the rotatable work tool, and a dust channel that is formedbetween the shielding cover and the rotatable work tool. A dust hose is arranged to atleast indirectly connect the dust channel to a dust container and an electrically drivenfan which comprises a fan motor. The electrically driven fan is arranged to convey airfrom the dust channel into the dust container via the dust hose. The engine-driven toolfurthermore comprises an electrical generator that is at least indirectly electricallyconnectable to the fan motor and is arranged to be at least indirectly driven by theengine. The electrical generator is furthermore arranged to generate an electricalcurrent when driven, where said electrical current at least indirectly is arranged topropel the fan motor.
    According to an example, the engine-driven tool comprises an electrical conductorarrangement that is arranged to at least indirectly connect the electrical generator tothe fan motor.
    According to another example, the electrical conductor arrangement is partly runninginside the dust hose.
    According to another example, the electrical conductor arrangement is releasablyconnectable to the electrical generator and/or the electrically driven fan.
    According to another example, the electrical generator comprises circumferentiallyarranged coils and is co-axially arranged with an engine flywheel that comprises atleast one circumferentially running magnet. The engine flywheel is arranged to spinwhile the electrical generator is fixed in relation to an engine flywheel such that themagnets spin past the coils when the engine flywheel is rotating.
    According to another example, the engine-driven tool comprises a power transferringmeans that is arranged to connect the rotatable work tool to the engine. The electricalgenerator is suitably arranged to be propelled by the power transferring means.
    Other examples are disclosed in the dependent claims.
    A number of advantages are obtained by means of the present disclosure. Mainly, thepower cutter does not have to be equipped with an integrated fan for dust removal, andthe electrically driven fan does not need a separate power source. This results in a toolwith reduced weight that thus is easy to handle.
    BFllEF DESCRIPTION OF THE DRAWINGS The present disclosure will now be described more in detail with reference to theappended drawings, where: Figure 1 shows a perspective view of a hand-held power cutter; Figure 2A shows a partially cut-open view of a part of the power cutter without anengine flywheel; and Figure 2B shows the engine flywheel and an electrical generator.
    DETAILED DESCRIPTION With reference to Figure 1, there is a hand-held power cutter 1 with a circularly shapedsaw blade 2, for example suitable to cut through concrete. The power cutter 1comprises a casing 3 at least partly enclosing a combustion engine 4, where the casing3 in turn comprises a first handle part 5 from which a power/throttle switch 6a andcorresponding switch lock 6b is accessible. The power cutter 1 further comprises a second handle part 7 that runs in an arcuate shape over the casing 3, the secondhandle part 7 being attached to the casing 3 via means that attenuate vibrations in awell-known manner.
    The power cutter 1 comprises a shielding cover 8 that is arranged to shield a part ofthe saw blade 2. The saw blade 2 is connected to the engine 4 with a power transferringmeans 9 that is covered by a power transfer cover 10. The power transferring means9 is according to some aspects either in the form of an endless belt or a gearedtransmission.
    A dust channel 11 is formed between the shielding cover 8 and the saw blade 2, wherea dust pipe 12 is connected between an upper part of the shielding cover 8 and a firsthose end 13 of a dust hose 14. A second hose end 15 of the dust hose 14 is connectedto a dust container 17 and an electrically driven fan 16 that is arranged to lower the airpressure at the second hose end 15 such that air is conveyed from the first hose end13 to the second hose end 15 and further into the dust container 17 via the fan 16,such that an operation that is similar or the same as the operation of a vacuum cleaneris obtained. When the power cutter 1 is in operation and the saw blade 2 for exampleis cutting through concrete, a lot of concrete dust is formed. By means of the fan 16and the dust hose 14, the concrete dust is conveyed from the dust channel 11 in theshielding cover 8 to the dust container 17. lt is to be noted that the fan 16 and the dustcontainer 17 only are schematically indicated for describing a principle, not beingshown in actual sizes and configurations.
    According to the present disclosure, with reference also to Figure 2A and Figure 2B,the power cutter 1 comprises an electrical generator 18 that is at least indirectlyelectrically connected to the fan motor 26 and is arranged to be at least indirectly drivenby the engine 4 and to generate an electrical current when driven. Said electricalcurrent is at least indirectly arranged to propel the fan motor 26.
    Figure 1 shows the electrical generator 18 schematically indicated with dashed lines,Figure 2A shows a partially cut-open view of a part of the power cutter 1 without anengine flywheel 19 but with the electrical generator 18 schematically indicated withdashed lines, According to some aspects, the generator 18 is positioned inside the flywheel 19 and is attached in a fixed manner to a crank case (not shown), for exampleby means of screws. Figure 2B shows the engine flywheel 19 together with theelectrical generator 18 only schematically indicated with dashed lines, as well asseparately.
    The electrical generator 18 is arranged to be mounted such that it is fixed in relation toan engine flywheel 19 as will be described in detail below. The engine flywheel 19comprises circumferentially running magnets 20 (only a few indicated for reasons ofclarity) and the electrical generator 18 comprises circumferentially running coils 21(only a few indicated for reasons of clarity). Generally, the engine flywheel 19 comprises at least one circumferentially running magnet.
    The flywheel 19 is arranged to be mounted to an engine axis 22 such that when theengine is running, the flywheel is spinning while the electrical generator 18 is fixed inrelation to an engine flywheel 19. As indicated in Figure 2B, the electrical generatorand the flywheel are co-axially arranged, such that the magnets 20 spin past the coils21 such that an electrical current is induced and is available at generator terminals 23.An electrical conductor arrangement 24 is connected to the generator terminals 23 andruns to fan motor terminals 25a, 25b at the fan motor 26 schematically indicated inFigure 1. ln this way, electrical power that is generated by the electrical generator 18 is used forpropelling the fan motor 26. Due to the type of fan motor 26 that is used in the fan 16,a power conversion device 27 may be needed and could for example be comprised inthe fan 16 or between the electrical generator 16 and the first hose end 13 along theelectrical conductor arrangement 24. ln Figure 1, a power conversion device 27 ispositioned at the fan motor terminals 25a, 25b, being arranged to convert the incomingelectrical current to a format suitable for the fan motor 26. Such a power conversiondevice 27 could be an alternating current (AC) to direct current (DC) converter deviceor a frequency period time converter device. lt is to be noted, that due to the type offan motor 26, a power conversion device 27 does not have to be used.
    This means that when the power cutter engine 4 is run, the electrical generator 18 isalso run. The electrical generator 18 is electrically connected to the electrically driven fan 16, such that the power cutter engine 4 is arranged to run the electrical generator18, and when electrical current is generated by the electrical generator 18, saidelectrical current can be used for running the electrically driven fan 16 via the electricalconductor arrangement 24. ln this manner, the power cutter does not have to be equipped with an integrated fanfor dust removal, and the electrically driven fan 16 does not need a separate powersource, but acquires its required electrical power from the electrical generator 18 thatis comprised in the power cutter 1. ln this example, the electrical conductor arrangement 24 is shown to be running insidethe dust hose 14. According to some aspects, the electrical conductor arrangement 24is running outside the dust hose 14; either attached to the outer surface of the dusthose 14 or separate from the dust hose 14.
    According to some aspects, the conductor arrangement 24 is releasably connectableto the electrical generator 18 and/or the electrically driven fan 16, for example bymeans of a corresponding electrical connector at a suitable position, as schematicallyindicated with dashed lines in Figure 1 where an electrical connector 30 is positionedat the casing. A corresponding electrical connector can be mounted electrically drivenfan 16 as well. Such electrical connectors suitably comprises an environmentprotection; and are according to some aspects screw-mounted.
    The present disclosure is not limited to the above examples, but may vary freely withinthe scope of the appended claims. For example, the electrical generator 18 may bepositioned at any other rotating part and is at least indirectly driven by the engine 4.According to some aspects, the electrical generator 18 is connected to, and arrangedto be propelled by the power transferring means 9, such as a drive belt. According tosome aspects, the electrical generator 18 is at least partly comprised in a clutch wheelthat is arranged to drive a drive belt, or alternatively at least partly comprised in a beltwheel that is connected to the saw blade 2.
    The number of coils and magnets shown in the Figures is only an example fordescribing a principle; there may of course be any suitable number of coils and anysuitable number of magnets.
    The electrical generator 18 is according to some aspects at least partly made in aplastic material that constitutes an insulator and provides a low weight for the electricalgenerator 18.
    The hand-held power cutter 1 with a circular saw blade 2 may be any type of engine-driven tool with a rotatable work tool such as a saw blade, a circular saw blade or aring saw blade, where dust removal is desired. Only some items of the engine-driventool in the example have been described, the engine-driven tool in itself being of awell-known kind.
    The dust hose 14 is arranged to connect the dust channel 11 to the dust container 17via the dust pipe 12. The dust hose 14 is according to some aspects directly connectedto the shielding cover 8 and the dust channel 11.
    The fan 16 is shown positioned between the second hose end 15 and the dustcontainer 17, and is shown to be supported by a stand 29. The fan may have otherpositions downstream the second hose end 15. For example, the dust container 17can be positioned between the fan 16 and the dust hose 14.
    The electrical conductor arrangement 24 may comprise two or more conductor wiresdepending on number of phases, the possible presence of a ground connection, possible data communication wires.
    The fan 16 is suitably equipped with a switch 28 for turning on or turning off the fan 16.Such a switch 28 may be positioned anywhere along the electrical conductorarrangement 24; in Figure 1 the switch is shown positioned at the dust container 17.
    According to some aspects, the dust container 17 comprises dust bags which arereplaced when filled with dust to a sufficient extent.
    Generally, the present disclosure relates to an engine-driven tool 1 comprising arotatable work tool 2, an engine 4 that is arranged to propel the rotatable work tool 2,a shielding cover 8 that is arranged to shield a part of the rotatable work tool 2, and adust channel 11 that is formed between the shielding cover 8 and the rotatable worktool 2, where a dust hose 14 is arranged to at least indirectly connect the dust channel11 to a dust container 17 and an electrically driven fan 16 which comprises a fan motor26, where the electrically driven fan 16 is arranged to convey air from the dust channel11 into the dust container 17 via the dust hose 14. The engine-driven tool 1 comprisesan electrical generator 18 that is at least indirectly electrically connectable to the fanmotor 26 and is arranged to be at least indirectly driven by the engine 4, where theelectrical generator 18 furthermore is arranged to generate an electrical current whendriven, where said electrical current at least indirectly is arranged to propel the fanmotor 26.
    According to an example, the engine-driven tool 1 comprises an electrical conductorarrangement 24 that is arranged to at least indirectly connect the electrical generator18 to the fan motor 26.
    According to an example, the electrical conductor arrangement 24 partly is runninginside the dust hose 14.
    According to an example, the electrical conductor arrangement 24 is releasablyconnectable to the electrical generator 18 and/or the electrically driven fan 16.
    According to an example, the electrical conductor arrangement 24 is releasablyconnectable by means of at least one screw-mounted electrical connector 30.
    According to an example, the engine-driven tool 1 comprises a power transferringmeans 9 that is arranged to connect the rotatable work tool 2 to the engine 4.
    According to an example, the engine-driven tool 1 comprises a dust pipe 12 that isconnected between an upper part of the shielding cover 8 and a first hose end 13 ofthe dust hose 14, where the dust pipe 12 is arranged to extend over the power transferring means 9.
    According to an example, the electrical generator 18 comprises circumferentiallyarranged coils and is co-axially arranged with an engine flywheel 19 that comprises atleast one circumferentially running magnet 20, where the engine flywheel 19 isarranged to spin while the electrical generator 18 is fixed in relation to an engineflywheel 19 such that the magnets 20 spin past the coils 21 when the engine flywheel 19 is rotating.
    According to an example, the electrical generator 18 is arranged to be propelled by the power transferring means 9.
    权利要求:
    Claims (9)
    [1] 1. An engine-driven tool (1) comprising a rotatable work tool (2), an engine(4) that is arranged to propel the rotatable work tool (2), a shielding cover (8) that isarranged to shield a part of the rotatable work tool (2), and a dust channel (11) that isformed between the shielding cover (8) and the rotatable work tool (2), where a dusthose (14) is arranged to at least indirectly connect the dust channel (11) to a dustcontainer (17) and an electrically driven fan (16) which comprises a fan motor (26),where the electrically driven fan (16) is arranged to convey air from the dust channel(11) into the dust container (17) via the dust hose (14), characterized in that theengine-driven tool (1) comprises an electrical generator (18) that is at least indirectlyelectrically connectable to the fan motor (26) and is arranged to be at least indirectlydriven by the engine (4), where the electrical generator (18) furthermore is arranged togenerate an electrical current when driven, where said electrical current at leastindirectly is arranged to propel the fan motor (26).
    [2] 2. An engine-driven tool (1) according to claim 1, characterized in that theengine-driven tool (1) comprises an electrical conductor arrangement (24) that isarranged to at least indirectly connect the electrical generator (18) to the fan motor(26).
    [3] 3. An engine-driven tool (1) according to claim 2, characterized in that theelectrical conductor arrangement (24) partly is running inside the dust hose (14).
    [4] 4. An engine-driven tool (1) according to any one of the claims 2 or 3,characterized in that the electrical conductor arrangement (24) is releasablyconnectable to the electrical generator (18) and/or the electrically driven fan (16).
    [5] 5. An engine-driven tool (1) according to claim 4, characterized in that theelectrical conductor arrangement (24) is releasably connectable by means of at leastone screw-mounted electrical connector (30). 11
    [6] 6. An engine-driven tool (1) according to any one of the previous claims,characterized in that the engine-driven tool (1) comprises a power transferring means(9) that is arranged to connect the rotatable work tool (2) to the engine (4).
    [7] 7. An engine-driven tool (1) according to claim 6, characterized in that theengine-driven tool (1) comprises a dust pipe (12) that is connected between an upperpart of the shielding cover (8) and a first hose end (13) of the dust hose (14), wherethe dust pipe (12) is arranged to extend over the power transferring means (9).
    [8] 8. An engine-driven tool (1) according to any one of the previous claims,characterized in that the electrical generator (18) comprises circumferentiallyarranged coils and is co-axially arranged with an engine flywheel (19) that comprisesat least one circumferentially running magnet (20), where the engine flywheel (19) isarranged to spin while the electrical generator (18) is fixed in relation to an engineflywheel (19) such that the magnets (20) spin past the coils (21) when the engineflywheel (19) is rotating.
    [9] 9. An engine-driven tool (1) according to any one of the claims 6 or 7,characterized in that the electrical generator (18) is arranged to be propelled by the power transferring means (9).
    类似技术:
    公开号 | 公开日 | 专利标题
    DE3880752D1|1993-06-09|GRINDING DEVICE WITH DUST EXTRACTION DEVICE.
    SE1651452A1|2018-03-13|An engine-driven tool with a generator connected to a fan motor
    US20210069807A1|2021-03-11|Dust Removal Arrangement for an Engine-Driven Tool
    GB1569532A|1980-06-18|Suction device for attachment to a motor-driven hand tool
    US2444598A|1948-07-06|Tile-sawing machine
    GB690979A|1953-04-29|Improvements in or relating to electrical generating machines
    JPS61200333A|1986-09-04|Torque fluctuation restraining device for engine
    US2585313A|1952-02-12|Starter for internal-combustion engines
    ES335719A1|1967-12-16|A machine for working surfaces of concrete floors. |
    JPS6215069A|1987-01-23|Hose grinding device
    CN206808071U|2017-12-29|A kind of agricultural machinery of weeding
    GB618339A|1949-02-21|Improvements in or relating to appliances for cutting and gathering leaves, grasses, herbs and so forth
    GB839265A|1960-06-29|Improvements in abrasive blasting appliances
    ES360615A1|1970-07-16|Equipment for the collection of the olive. |
    GB848325A|1960-09-14|Improvements in or relating to hedge trimming appliances
    GB946192A|1964-01-08|Grinding apparatus
    CN109474140A|2019-03-15|Automatic charging device is used in a kind of processing of motor stator
    US1958753A|1934-05-15|Stationary armature construction
    JPS51142627A|1976-12-08|The starting operation system of a generator-motor in pumping-up power equipments
    GB705933A|1954-03-24|Engine couplings
    CN104695686A|2015-06-10|Skirting machine
    GB518820A|1940-03-08|A portable vibrator, chiefly adapted for the vibration of concrete
    GB625293A|1949-06-24|Improvements in and relating to planimeters employing photo-sensitive devices
    GB992840A|1965-05-19|Improvements in lawn mowers
    GB500750A|1939-02-15|Vibrator for use in consolidating concrete
    同族专利:
    公开号 | 公开日
    JP6970196B2|2021-11-24|
    SE540065C2|2018-03-13|
    WO2018084771A1|2018-05-11|
    US20200261991A1|2020-08-20|
    JP2020500495A|2020-01-09|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JPH0339365U|1989-08-21|1991-04-16|
    WO1998043794A1|1997-03-28|1998-10-08|Koumu Co., Ltd.|Hand cutter|
    JPH1119820A|1997-06-30|1999-01-26|Kioritz Corp|Power cutter with dust sucking device|
    JP3429983B2|1997-08-27|2003-07-28|株式会社共立|Power cutting machine with dust suction device|
    JP3729624B2|1997-10-31|2005-12-21|小松ゼノア株式会社|Hand cutter|
    SE520988C2|1998-11-12|2003-09-16|Stihl Maschf Andreas|Hand-made work tool with generator|
    JP3805154B2|1999-12-13|2006-08-02|株式会社共立|Engine cutter|
    JP4021625B2|2001-02-01|2007-12-12|株式会社マキタ|Dust collector and electric tool|
    CN101505899A|2006-07-13|2009-08-12|创科实业有限公司|Portable power tool for cutting concrete board and other substrates|
    US9221110B2|2009-10-02|2015-12-29|JPL Global, LLC|Power saw apparatus with integrated dust collector|JP2020196151A|2019-05-31|2020-12-10|株式会社呉英製作所|Portable circulation filtering device|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1651452A|SE540065C2|2016-11-03|2016-11-03|An engine-driven tool with a generator connected to a fan motor|SE1651452A| SE540065C2|2016-11-03|2016-11-03|An engine-driven tool with a generator connected to a fan motor|
    PCT/SE2017/051050| WO2018084771A1|2016-11-03|2017-10-25|An engine-driven tool with a generator connected to a fan motor|
    US16/347,324| US20200261991A1|2016-11-03|2017-10-25|An engine-driven tool with a generator connected to a fan motor|
    JP2019522900A| JP6970196B2|2016-11-03|2017-10-25|Engine driven tool with generator connected to fan motor|
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