EP2679357A2 - Work device - Google Patents
Work device Download PDFInfo
- Publication number
- EP2679357A2 EP2679357A2 EP13002893.9A EP13002893A EP2679357A2 EP 2679357 A2 EP2679357 A2 EP 2679357A2 EP 13002893 A EP13002893 A EP 13002893A EP 2679357 A2 EP2679357 A2 EP 2679357A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- cam
- clutch
- speed
- reset
- combustion engine
- 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.)
- Granted
Links
- 238000002485 combustion reaction Methods 0.000 claims abstract description 24
- 230000008878 coupling Effects 0.000 claims description 17
- 238000010168 coupling process Methods 0.000 claims description 17
- 238000005859 coupling reaction Methods 0.000 claims description 17
- 230000001419 dependent effect Effects 0.000 claims description 2
- 239000000446 fuel Substances 0.000 description 7
- 239000000203 mixture Substances 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N19/00—Starting aids for combustion engines, not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M1/00—Carburettors with means for facilitating engine's starting or its idling below operational temperatures
- F02M1/02—Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling being chokes for enriching fuel-air mixture
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M1/00—Carburettors with means for facilitating engine's starting or its idling below operational temperatures
- F02M1/08—Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling becoming operative or inoperative automatically
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
- F02B63/02—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for hand-held tools
Definitions
- the invention relates to a working device of the type specified in the preamble of claim 1.
- a portable working device namely a power saw known, in which a starting position is adjustable via a mode selector.
- a starting position is adjustable via a mode selector.
- means for detecting the starting position are provided.
- the invention has for its object to provide a working device of the generic type, which has a simple structure and are avoided in the incorrect operation.
- the return device ensures that the starting position is not maintained when the speed of the crankshaft of the engine of the working device exceeds a reset speed. As a result, a release of the starting position can be achieved in a simple manner.
- the restoring device advantageously locks an adjustment of the start-up device into a starting position at a rotational speed above the reset rotational speed.
- the Reset speed is advantageously below the usual operating speed. As a result, it can be prevented in a simple manner that the start enrichment device is accidentally set to the start position by the operator during normal operation.
- a simple structure is achieved when the restoring device has an actuating element which is adjustable between an actuated and an unactuated position.
- the actuator is advantageously mounted stationary in the housing, so does not rotate with the crankshaft of the drive motor or a drive shaft of the tool.
- the position of the start enrichment device is advantageously coupled to the position of the actuating element.
- the actuator is in particular in the starting position of the start enrichment device in the unactuated and in the operating position of the Startanreich réelles adopted in the actuated position. This ensures in a simple manner that when actuated position of the actuating element, the Startanreich réelles recruited is always in the operating position and not in the starting position.
- the restoring device comprises a cam which is operatively connected to the crankshaft at rotational speeds above the reset rotational speed and which acts on the actuating element.
- the cam can always be operatively connected to the crankshaft and rotate with it.
- the cam is connected downstream of a clutch of the working device, for example, which engages only at or above the reset rotational speed, so that the cam is operatively connected to the crankshaft only above the reset rotational speed.
- the internal combustion engine is advantageously operatively connected to the tool via a clutch which switches in dependence on the rotational speed, in particular via a centrifugal clutch.
- the cam is arranged on the drive side of the clutch.
- the position of the cam is advantageously dependent on the speed of the crankshaft. This can be achieved in a simple manner in that the cam is arranged on a flyweight of the coupling designed as a centrifugal clutch. As the speed increases, the centrifugal weight moves away from the axis of rotation. This movement of the flyweight can be used to actuate the actuator.
- the actuator has in the unactuated position to the axis of rotation of the clutch a distance which is greater than the outer distance of the cam of the rotation axis at speeds below the reset speed.
- the outer distance of the cam is the distance of the adjacent to the actuator arranged outer circumference of the cam, so the area of the cam, which has the greatest distance from the axis of rotation and can come into contact with the actuator, so the actuator has no offset in the direction of the axis of rotation , At a speed below the reset speed of the cam can not come into contact with the actuator due to the smaller distance from the axis of rotation and not operate this.
- the actuating element is arranged radially outside of the cam relative to the axis of rotation of the crankshaft. The actuator is therefore located outside a circle on which moves the outer portion of the cam.
- At a speed above the reset speed of the cam advantageously has a larger outer distance to the axis of rotation than the actuator in the de-energized position and adjusts the actuator in the actuated position.
- the orbit described by the outer portion of the cam acts as a fixed limit at speeds above the reset speed due to the rapid rotation, which prevents the actuator from being returned to the unactuated position. As a result, an adjustment of the mode selector is prevented in the starting position at speeds above the reset speed.
- the reset rotational speed is an engagement speed of the clutch.
- the reset speed is advantageously the speed at which the clutch begins to engage, the output side and the tool thus begin to move.
- the rotational movement of the output side of the clutch is used as an actuating movement for the provision of the start enrichment device.
- the cam is arranged in particular on the output side of the coupling, and the outer distance of the cam to the rotational axis of the coupling is smaller than the distance of the actuating element to the rotational axis in the unactuated position of the actuating element.
- the cam actuates the adjusting element during the first revolution of the output side of the clutch and adjusts it into the actuated one Position.
- the clutch has a clutch drum on which the cam is fixed.
- combustion air is supplied to the internal combustion engine via an intake passage.
- at least one adjustable valve element is arranged in the intake channel, wherein the start enrichment device acts on the position of the valve element.
- the valve element may be a throttle element or a choke element.
- the start enrichment device can also act both on a throttle element and on a choke element and adjust it to a suitable starting position.
- the speed of the crankshaft can alternatively be detected by other means.
- the rotational speed of the crankshaft can be detected via a sensor, and the start enrichment device can be reset to the operating position as a function of the sensor signal.
- the oil pressure can be used as a parameter for the speed of the crankshaft.
- the oil can act on a sprung actuator, which is adjusted depending on the oil pressure.
- Other parameters of the implement which allow a conclusion about the speed of the crankshaft, can be used to operate the restoring device.
- Fig. 1 shows as an exemplary embodiment of a working device, a hand-held working device, namely a brushcutter 1.
- a brushcutter the present invention can also be used in other implements such as chainsaws, cutters or the like.
- the brushcutter 1 has a guide tube 3. At the end of the guide tube 3, which faces away from the ground during operation, a motor housing 2 is arranged. At the motor housing 2 opposite, facing the bottom end of the guide tube 3, a cutting head 4 is arranged, which carries a tool 5.
- the tool 5 is a knife. Instead of the blade 5, however, another tool such as a thread mowing head or the like may be provided.
- the tool 5 rotates about an axis of rotation 6, which is transverse to the longitudinal axis of the guide tube 3.
- a protection 7 is fixed to the guide tube 3, the tool 5 in the direction of the motor housing 2 and shields to an operator of the brush cutter 1 down.
- a handle frame with two handles 8 for guiding the brush cutter 1 is set on the guide tube 3.
- an internal combustion engine 9 is arranged in the motor housing 2, an internal combustion engine 9 is arranged.
- the internal combustion engine 9 has a piston 11 which rotatably drives a crankshaft 12 about a rotation axis 20.
- the internal combustion engine 9 also has a spark plug 10 for igniting the fuel / air mixture.
- a starting device 13 is provided, which may be designed, for example, as a pull-starter or as an electrical starting device.
- a fan 14 is fixed to the crankshaft 12.
- the fan 14 carries magnets, not shown, which induce the ignition voltage for the spark plug 10 in a arranged on the outer circumference of the fan 14 ignition module 23.
- centrifugal clutch 15 On the crankshaft 12, a centrifugal clutch 15 is also fixed.
- the centrifugal clutch 15 has a clutch drum 16, which is arranged on the output side of the centrifugal clutch 15 and which is connected via a coupling piece 18 with a guided through the guide tube 3 drive shaft 19. About the drive shaft 19, the knife 5 is driven.
- a brake band 17 On the outer circumference of the clutch drum 16, a brake band 17 may be arranged, which is part of a brake device, not shown.
- the internal combustion engine 9 is fuel / air mixture on the in Fig. 3 shown carburetor 21 supplied.
- the internal combustion engine 9 is advantageously a mixture-lubricated engine, in particular a single-cylinder engine.
- the internal combustion engine 9 is a two-stroke engine.
- the carburetor 21 has a carburetor housing 24 in which an intake passage 25 is formed. Through the intake passage 25, fuel / air mixture is sucked to the engine 9 during operation. The fuel can be sucked into the intake passage due to the pressure prevailing in the intake passage 25 negative pressure. However, it may also be provided an electronic metering of the fuel in the intake passage 25. It can also be provided to supply the fuel via a fuel valve directly into the internal combustion engine 9, in particular into the crankcase of the internal combustion engine 9.
- the carburetor 21 is in this case only as a throttle device for control the amount of air supplied to the engine 9 and not designed as a mixture forming device.
- a throttle valve 26 is pivotally mounted with a throttle shaft 28 about a pivot axis 32. Outside the carburetor housing 24, a throttle lever 30 is fixed to the throttle shaft 28.
- Fig. 3 is the intake port 25 drawn to illustrate the structure to the throttle lever 30 out.
- the intake passage 25 is configured as a tube through the carburetor housing 24, and the throttle lever 30 is disposed on the outside of the carburetor housing 24.
- Fig. 3 shows the throttle valve 26 in neutral position.
- a choke flap 27 is pivotally mounted in the intake passage 25 with a choke shaft 29 about a pivot axis 33.
- a choke lever 31 is fixed to the choke shaft 29, which cooperates with the throttle lever 30.
- a coupling rod 35 which couples the position of the choke lever 31 to the position of a mode selector 22.
- the mode selector 22 is pivotally mounted about a pivot axis 36.
- the mode selector 22 and the coupling rod 35 are part of a start enrichment device 60.
- the start enrichment device 60 is shown in an operating position 52. In the operating position, the choke flap 27 is fully open, and the throttle valve 26 is in its idle position.
- the start enrichment device is moved into a start position, for example a hot start position or a cold start position.
- a start position for example a hot start position or a cold start position.
- the throttle lever 30 is pivoted out of the swing range of the choke lever 31, as in FIG Fig. 3 indicated by the arrow 38.
- the mode selector 22 is operated by the operator and pivoted in the direction of the arrow 40, whereby the choke lever 31 is pivoted in the direction of the arrow 39 and the choke flap 27 in the in Fig. 4 shown starting position 41 is adjusted.
- start position 41 the choke flap 27 closes the flow cross-section of the intake passage 25 partially.
- start position 53 of the start enrichment device 60 the throttle valve 26 is slightly opened. In order to hold the throttle valve 26 in this position, the throttle lever 30 abuts against a shoulder 42 of the choke lever 31. The throttle lever 30 is sprung toward the fully closed position of the throttle valve 26 and the choke lever 31 toward the fully open position of the choke 27. Due to the formation of throttle lever 30 and choke lever 31 and the spring load of choke lever 31 and throttle lever 30 are fixed the levers 30, 31 in the starting position 53 of the start enrichment device 60 mutually.
- start position 53 is a warm start position.
- the start enrichment device 60 may have a cold start position. In the cold start position, the choke flap 27 is advantageously completely closed so that combustion air can only flow through openings in the choke flap 27.
- Fig. 5 schematically shows a restoring device 61 of the brush cutter 1.
- the reset speed is advantageously within a Einkuppelwindierebands between a lower and an upper Einkuppelwindiere.
- the centrifugal clutch 15 has centrifugal weights 49, which are guided on guides 50 in their movement away from the axis of rotation 20 to the outside. On the outer circumference of the centrifugal weights 49, a cam 48 is arranged.
- start position 53 of the Startanreich mecanics Rhein 60 is the mode selector 22 in a position that is associated with a warm start symbol 44.
- the mode selector 22 can also be placed in an operating position and a cold start position.
- an operating symbol 43 for the operating position and a cold start symbol 45 for the cold starting position are arranged on the brushcutter 1, for example on the motor housing 2 Fig. 5 are shown schematically.
- the mode selector 22 is coupled via a coupling element, in the exemplary embodiment a coupling rod 46, with an actuating element 47.
- Each position of the mode selector 22 is assigned a position of the control element 47.
- the actuator 47 moves and vice versa.
- the coupling rod 46 is fixedly formed in the forces acting during operation.
- the coupling element may also be resilient in the acting operating forces.
- the adjusting element 47 is designed as a lever which is pivotally mounted about a pivot axis 51. As Fig. 2 shows, the actuator 47 is fixed and pivotally mounted on the motor housing 2. The actuator 47 does not rotate with the crankshaft 12 or the drive shaft 19 during operation.
- Fig. 5 is the actuator 47 arranged in an unactuated position 64.
- the speed of the crankshaft 12 and thus also the centrifugal clutch 15 is below a reset speed.
- the reset rotational speed is advantageously a rotational speed which corresponds to an engagement rotational speed of the centrifugal clutch 15.
- the centrifugal clutch 15 has a Einkuppelwindiereband extending from a lower speed at which the centrifugal weights 49 start to move outward, to an upper Einkuppelmosiere at which the flyweights 49 abut the clutch drum 16 extends.
- the reset speed is advantageously within this speed band, in particular in the region of the upper engagement speed.
- the cam 48 has at its outer, the axis of rotation remote area a distance b to the axis of rotation 20.
- the actuator 47 has in the in Fig. 5 shown unactuated position 64 at its axis of rotation 20 facing area a smallest distance a to the axis of rotation 20.
- the distance a is greater than the distance b, so that the cam 48 is not in contact with the actuating element during rotation of the crankshaft 12 about the rotation axis 20 47 is coming.
- Fig. 6 shows the return device 61 at a speed of the crankshaft 12, which is above the reset speed.
- the flyweights 49 have moved radially outward with respect to the axis of rotation 20.
- the cam 48 has a greatest distance d, which is greater than the distance b, from the axis of rotation 20. Fig. 5 ) and also greater than the distance a of Control element 47 in the unactuated position 64 to the rotation axis 20 ( Fig. 5 ).
- the cam 48 has the actuating element 47 during the rotation of the crankshaft 12 in the direction of the arrow 37 (FIG. Fig. 6 ) is adjusted to its actuated position 63.
- the actuator 47 In the actuated position 63, the actuator 47 has a smallest distance c to the rotation axis 20, which is greater than the distance d in the embodiment.
- the actuator 47 By an appropriately designed detent position of mode selector 22 and / or actuator 47 can be achieved that the actuator 47 is further outward than the cam 48, the actuator 47 presses outward. This ensures that the actuator 47 is not permanently actuated by the cam 48 during operation. As a result, wear and noise can be kept low.
- the mode selector In the actuated position 63 of the actuating element 47, the mode selector is in a position to which the operating symbol 43 is assigned.
- the starting position 53 of choke flap 27 and throttle valve 26 is achieved in this position of the mode selector 22.
- the start enrichment device 60 is located in the in Fig. 3 shown operating position 60.
- FIGS. 7 and 8 show a structural design for the return device 61.
- the return device 61 is shown in the unactuated position of the actuating element 47 at a speed above the reset speed.
- the cam 48 is applied to the actuating element 47.
- the mode selector 22 is in a position associated with the warm start symbol 44.
- the actuator 47 has to the rotation axis 20 a distance a, which is smaller than the distance d of the cam 48 to the rotation axis 20.
- the cam 48 is designed as a flat ramp to keep a shock on the actuator 47 when adjusting to the actuated position 63 as low as possible.
- Fig. 8 shows the return means 61 after the crankshaft 12 has rotated by a few degrees in the direction of arrow 37 on.
- the cam 48 has moved past the adjusting element 47 and thereby pivoted the actuating element 47 relative to the axis of rotation 20 to the outside.
- the actuator 47 is located in Fig. 8 in the actuated position 63, while the actuator 47 in Fig. 7 is shown in the de-energized position 64.
- the actuator 47 has adjusted via the coupling rod 46 and the mode selector 22 in the operating position 52. This became the Start position of start enrichment device 60 is released and throttle flap 26 and choke flap 27 (FIG. Fig. 3 ) were returned to the unconfirmed position.
- the return from the latched position can for example be made possible by the throttle lever 30 ( Fig. 3 ) is made of an elastic material.
- Fig. 8 also shows a spring 59 of the centrifugal clutch 15, which acts on the flyweight 49.
- the guides 50 of the flyweights 49 are inclined, so that the flyweights 49 also move in the circumferential direction on their way from the axis of rotation 20 to the outside.
- FIGS. 9 and 10 show a restoring device 62, which may be provided instead of a restoring device 61.
- the same reference numerals as in the preceding figures designate corresponding elements.
- the restoring device 62 has a cam 57, which is fixed on the output side of the centrifugal clutch 15, namely on the clutch drum 16. The cam 57 moves together with the clutch drum 16 only when the centrifugal weights 49 (FIG. Fig. 5 to 8 ) abut the clutch drum 16 and begin to take this.
- Fig. 9 shows the return device 62 in the start position 53 of the start enrichment device 60.
- Wie Fig. 9 shows, a stop position for the mode selector 22 is additionally provided, which is associated with a stop symbol 54.
- the mode selector 22 short-circuits the ignition of the internal combustion engine 9.
- the mode selector 22 is connected via a coupling element 58, which in the FIGS. 9 and 10 only shown schematically, connected to an actuating element 55.
- the coupling element 58 may be, for example, a coupling rod, a Bowden cable, a lever linkage or the like.
- the actuator 55 is mounted longitudinally displaceable in a guide 56. However, the actuator 55 may alternatively be designed as a pivotable lever or the like.
- the cam 57 has at its outer, the rotation axis 20 remote, provided for the actuation of the actuating element 55 range a distance f to the rotation axis 20.
- the cam 57 does not move relative to the actuator 55, and the start enrichment device 60 stops in its starting position 53.
- the cam 57 comes into contact with the actuating element 55 and moves it into its actuated position 63.
- About the coupling element 58 of the mode selector 22 is moved to its operating position 52.
- the actuator 55 has in the actuated position 63 a distance g to the axis of rotation 20, which is advantageously slightly larger than the distance f of the cam 57. This can be achieved by a corresponding locking position of the actuating element 55. This prevents the cam 57 from coming into contact with the actuating element 55 during each revolution of the clutch drum 16.
- the cams 48 and 57 also prevent the mode selector 22 from being placed in the starting position 53 of the start enrichment device 60 when the speed is above the reset speed.
- the cams 48 and 57 come in an adjustment of the mode selector 22 with the adjusting elements 47 and 55 in contact. Since the crankshaft 12 and the centrifugal clutch 15 rotate relatively quickly, namely at a speed above the reset speed, the cams 48 and 57 act as a continuous, rotationally symmetrical to the rotation axis 20 limiting the displacement of the actuating elements 47 and 55, respectively. This avoids a simple way that the mode selector 22 can be reset in operation in the starting position 53.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- One-Way And Automatic Clutches, And Combinations Of Different Clutches (AREA)
- Harvester Elements (AREA)
- Portable Power Tools In General (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
- High-Pressure Fuel Injection Pump Control (AREA)
Abstract
Description
Die Erfindung betrifft ein Arbeitsgerät der im Oberbegriff des Anspruchs 1 angegebenen Gattung.The invention relates to a working device of the type specified in the preamble of
Aus der
Es ist bekannt, bei Arbeitsgeräten, die mit einem Vergaser mit Startgasverrastung betrieben werden, die Startgasverrastung zu lösen, wenn der Bediener den Gashebel betätigt.It is known that work implements that are operated with a carburetor with Startgasverrastung, the Startgasverrastung solve when the operator operates the throttle.
Der Erfindung liegt die Aufgabe zugrunde, ein Arbeitsgerät der gattungsgemäßen Art zu schaffen, das einen einfachen Aufbau besitzt und bei dem Fehlbedienungen vermieden sind.The invention has for its object to provide a working device of the generic type, which has a simple structure and are avoided in the incorrect operation.
Diese Aufgabe wird durch ein Arbeitsgerät mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved by a working device with the features of
Die Rückstelleinrichtung stellt sicher, dass die Startstellung nicht eingelegt bleibt, wenn die Drehzahl der Kurbelwelle des Verbrennungsmotors des Arbeitsgeräts eine Rückstelldrehzahl überschreitet. Dadurch kann auf einfache Weise ein Lösen der Startstellung erreicht werden.The return device ensures that the starting position is not maintained when the speed of the crankshaft of the engine of the working device exceeds a reset speed. As a result, a release of the starting position can be achieved in a simple manner.
Vorteilhaft sperrt die Rückstelleinrichtung eine Verstellung der Startanreichungseinrichtung in eine Startstellung bei einer Drehzahl oberhalb der Rückstelldrehzahl. Die Rückstelldrehzahl liegt dabei vorteilhaft unterhalb der üblichen Betriebsdrehzahl. Dadurch kann auf einfache Weise verhindert werden, dass beim üblichen Betrieb vom Bediener versehentlich die Startanreicherungseinrichtung in die Startstellung gestellt wird.The restoring device advantageously locks an adjustment of the start-up device into a starting position at a rotational speed above the reset rotational speed. The Reset speed is advantageously below the usual operating speed. As a result, it can be prevented in a simple manner that the start enrichment device is accidentally set to the start position by the operator during normal operation.
Ein einfacher Aufbau wird erreicht, wenn die Rückstelleinrichtung ein Stellelement besitzt, das zwischen einer betätigten und einer unbetätigten Stellung verstellbar ist. Das Stellelement ist dabei vorteilhaft ortsfest in dem Gehäuse gelagert, rotiert also nicht mit der Kurbelwelle des Antriebsmotors oder einer Antriebswelle des Werkzeugs. Die Stellung der Startanreicherungseinrichtung ist dabei vorteilhaft an die Stellung des Stellelements gekoppelt. Das Stellelement steht insbesondere in Startstellung der Startanreicherungseinrichtung in der unbetätigten und in Betriebsstellung der Startanreicherungseinrichtung in der betätigten Stellung. Dadurch ist auf einfache Weise sichergestellt, dass bei betätigter Stellung des Stellelements die Startanreicherungseinrichtung immer in der Betriebsstellung und nicht in der Startstellung steht.A simple structure is achieved when the restoring device has an actuating element which is adjustable between an actuated and an unactuated position. The actuator is advantageously mounted stationary in the housing, so does not rotate with the crankshaft of the drive motor or a drive shaft of the tool. The position of the start enrichment device is advantageously coupled to the position of the actuating element. The actuator is in particular in the starting position of the start enrichment device in the unactuated and in the operating position of the Startanreicherungseinrichtung in the actuated position. This ensures in a simple manner that when actuated position of the actuating element, the Startanreicherungseinrichtung is always in the operating position and not in the starting position.
Ein einfacher Aufbau ergibt sich, wenn die Rückstelleinrichtung einen Nocken umfasst, der bei Drehzahlen oberhalb der Rückstelldrehzahl mit der Kurbelwelle wirkverbunden ist und der auf das Stellelement wirkt. Der Nocken kann dabei immer mit der Kurbelwelle wirkverbunden sein und mit dieser rotieren. Es kann jedoch auch vorgesehen sein, dass der Nocken beispielsweise einer Kupplung des Arbeitsgeräts nachgeschaltet ist, die erst bei oder oberhalb der Rückstelldrehzahl einkuppelt, so dass der Nocken erst oberhalb der Rückstelldrehzahl mit der Kurbelwelle wirkverbunden ist. Der Verbrennungsmotor ist mit dem Werkzeug vorteilhaft über eine drehzahlabhängig schaltende Kupplung, insbesondere über eine Fliehkraftkupplung, wirkverbunden.A simple structure results when the restoring device comprises a cam which is operatively connected to the crankshaft at rotational speeds above the reset rotational speed and which acts on the actuating element. The cam can always be operatively connected to the crankshaft and rotate with it. However, it may also be provided that the cam is connected downstream of a clutch of the working device, for example, which engages only at or above the reset rotational speed, so that the cam is operatively connected to the crankshaft only above the reset rotational speed. The internal combustion engine is advantageously operatively connected to the tool via a clutch which switches in dependence on the rotational speed, in particular via a centrifugal clutch.
Es kann vorgesehen sein, dass der Nocken an der Antriebsseite der Kupplung angeordnet ist. Die Position des Nockens ist vorteilhaft von der Drehzahl der Kurbelwelle abhängig. Dies kann auf einfache Weise dadurch erreicht werden, dass der Nocken an einem Fliehgewicht der als Fliehkraftkupplung ausgebildeten Kupplung angeordnet wird. Bei steigender Drehzahl bewegt sich das Fliehgewicht von der Drehachse weg nach außen. Diese Bewegung des Fliehgewichts kann genutzt werden, um das Stellelement zu betätigen. Vorteilhaft besitzt das Stellelement in unbetätigter Stellung zur Drehachse der Kupplung einen Abstand, der größer als der äußere Abstand des Nockens der Drehachse bei Drehzahlen unterhalb der Rückstelldrehzahl ist. Der äußere Abstand des Nockens ist dabei der Abstand des benachbart zum Stellelement angeordneten Außenumfangs des Nockens, also des Bereichs des Nockens, der den größten Abstand zur Drehachse besitzt und mit dem Stellelement in Kontakt kommen kann, zum Stellelement also keinen Versatz in Richtung der Drehachse aufweist. Bei einer Drehzahl unterhalb der Rückstelldrehzahl kann der Nocken aufgrund des geringeren Abstands zur Drehachse nicht mit dem Stellelement in Kontakt kommen und dieses nicht betätigen. Das Stellelement ist bezogen auf die Drehachse der Kurbelwelle radial außerhalb des Nockens angeordnet. Das Stellelement ist demnach außerhalb eines Kreises, auf dem sich der äußere Bereich des Nockens bewegt, angeordnet. Bei einer Drehzahl oberhalb der Rückstelldrehzahl besitzt der Nocken vorteilhaft einen größeren äußeren Abstand zur Drehachse als das Stellelement in unbetätigter Stellung und verstellt das Stellelement in die betätigte Stellung. Die Kreisbahn, die der äußere Bereich des Nockens beschreibt, wirkt bei Drehzahlen oberhalb der Rückstelldrehzahl aufgrund der schnellen Rotation wie eine feste Begrenzung, die verhindert, dass das Stellelement zurück in die unbetätigte Stellung gestellt werden kann. Dadurch ist ein Verstellen des Betriebsartenstellers in die Startstellung bei Drehzahlen oberhalb der Rückstelldrehzahl verhindert.It can be provided that the cam is arranged on the drive side of the clutch. The position of the cam is advantageously dependent on the speed of the crankshaft. This can be achieved in a simple manner in that the cam is arranged on a flyweight of the coupling designed as a centrifugal clutch. As the speed increases, the centrifugal weight moves away from the axis of rotation. This movement of the flyweight can be used to actuate the actuator. Advantageously, the actuator has in the unactuated position to the axis of rotation of the clutch a distance which is greater than the outer distance of the cam of the rotation axis at speeds below the reset speed. The outer distance of the cam is the distance of the adjacent to the actuator arranged outer circumference of the cam, so the area of the cam, which has the greatest distance from the axis of rotation and can come into contact with the actuator, so the actuator has no offset in the direction of the axis of rotation , At a speed below the reset speed of the cam can not come into contact with the actuator due to the smaller distance from the axis of rotation and not operate this. The actuating element is arranged radially outside of the cam relative to the axis of rotation of the crankshaft. The actuator is therefore located outside a circle on which moves the outer portion of the cam. At a speed above the reset speed of the cam advantageously has a larger outer distance to the axis of rotation than the actuator in the de-energized position and adjusts the actuator in the actuated position. The orbit described by the outer portion of the cam acts as a fixed limit at speeds above the reset speed due to the rapid rotation, which prevents the actuator from being returned to the unactuated position. As a result, an adjustment of the mode selector is prevented in the starting position at speeds above the reset speed.
Es kann vorgesehen sein, dass die Rückstelldrehzahl eine Einkuppeldrehzahl der Kupplung ist. Die Rückstelldrehzahl ist vorteilhaft die Drehzahl, bei der die Kupplung einzukuppeln beginnt, die Abtriebsseite und das Werkzeug also beginnen, sich zu bewegen. Vorteilhaft wird die Drehbewegung der Abtriebsseite der Kupplung als Stellbewegung für die Rückstellung der Startanreicherungseinrichtung benutzt. Der Nocken ist insbesondere an der Abtriebsseite der Kupplung angeordnet, und der äußere Abstand des Nockens zur Drehachse der Kupplung ist kleiner als der Abstand des Stellelements zur Drehachse in unbetätigter Stellung des Stellelements. Sobald die Abtriebsseite der Kupplung in Rotation versetzt wird, weil die Kupplung einkuppelt, betätigt der Nocken während der ersten Umdrehung der Abtriebsseite der Kupplung das Stellelement und verstellt diese in die betätigte Stellung. Insbesondere besitzt die Kupplung eine Kupplungstrommel, an der der Nocken festgelegt ist.It can be provided that the reset rotational speed is an engagement speed of the clutch. The reset speed is advantageously the speed at which the clutch begins to engage, the output side and the tool thus begin to move. Advantageously, the rotational movement of the output side of the clutch is used as an actuating movement for the provision of the start enrichment device. The cam is arranged in particular on the output side of the coupling, and the outer distance of the cam to the rotational axis of the coupling is smaller than the distance of the actuating element to the rotational axis in the unactuated position of the actuating element. As soon as the output side of the clutch is set in rotation because the clutch engages, the cam actuates the adjusting element during the first revolution of the output side of the clutch and adjusts it into the actuated one Position. In particular, the clutch has a clutch drum on which the cam is fixed.
Vorteilhaft wird dem Verbrennungsmotor über einen Ansaugkanal Verbrennungsluft zugeführt. In dem Ansaugkanal ist insbesondere mindestens ein verstellbares Ventilelement angeordnet, wobei die Startanreicherungseinrichtung auf die Stellung des Ventilelements wirkt. Das Ventilelement kann ein Drosselelement oder ein Chokeelement sein. Die Startanreicherungseinrichtung kann auch sowohl auf ein Drosselelement als auch auf ein Chokeelement wirken und diese in eine geeignete Startstellung verstellen.Advantageously, combustion air is supplied to the internal combustion engine via an intake passage. In particular, at least one adjustable valve element is arranged in the intake channel, wherein the start enrichment device acts on the position of the valve element. The valve element may be a throttle element or a choke element. The start enrichment device can also act both on a throttle element and on a choke element and adjust it to a suitable starting position.
Die Drehzahl der Kurbelwelle kann alternativ auch über andere Einrichtungen erfasst werden. Beispielsweise kann die Drehzahl der Kurbelwelle über einen Sensor erfasst werden, und die Startanreicherungseinrichtung kann in Abhängigkeit des Sensorsignals in die Betriebsstellung zurückgestellt werden. Bei Arbeitsgeräten, die eine Ölpumpe zur Förderung von Schmieröl für den Betrieb des Werkzugs besitzen, kann alternativ der Öldruck als Parameter für die Drehzahl der Kurbelwelle genutzt werden. Das Öl kann auf ein gefedertes Stellelement wirken, das in Abhängigkeit des Öldrucks verstellt wird. Auch andere Parameter des Arbeitsgeräts, die einen Rückschluss auf die Drehzahl der Kurbelwelle zulassen, können zur Betätigung der Rückstelleinrichtung genutzt werden.The speed of the crankshaft can alternatively be detected by other means. For example, the rotational speed of the crankshaft can be detected via a sensor, and the start enrichment device can be reset to the operating position as a function of the sensor signal. In the case of implements which have an oil pump for conveying lubricating oil for the operation of the train, alternatively, the oil pressure can be used as a parameter for the speed of the crankshaft. The oil can act on a sprung actuator, which is adjusted depending on the oil pressure. Other parameters of the implement, which allow a conclusion about the speed of the crankshaft, can be used to operate the restoring device.
Ausführungsbeispiele der Erfindung werden im Folgenden anhand der Zeichnung erläutert. Es zeigen:
- Fig. 1
- eine schematische Darstellung eines Freischneiders,
- Fig. 2
- einen schematischen Schnitt durch das Motorgehäuse des Freischneiders aus
Fig. 1 , - Fig. 3
- die Startanreicherungseinrichtung des Freischneiders aus
Fig. 1 in Betriebsstellung, - Fig. 4
- eine schematische Darstellung der Startanreicherungseinrichtung in Startstellung,
- Fig. 5
- eine schematische Darstellung der Rückstelleinrichtung des Freischneiders bei unbetätigter Stellung des Stellelements,
- Fig. 6
- die Rückstelleinrichtung aus
Fig. 5 in betätigter Stellung des Stellelements, - Fig. 7
- eine teilgeschnittene Ansicht des Motorgehäuses des Freischneiders mit der Starteinrichtung in Startstellung,
- Fig. 8
- den Freischneider aus
Fig. 7 mit der Starteinrichtung in Betriebsstellung, - Fig. 9
- eine schematische Darstellung eines Ausführungsbeispiels einer Rückstelleinrichtung mit dem Stellelement in unbetätigter Stellung,
- Fig. 10
- die schematische Darstellung aus
Fig. 9 mit dem Stellelement in betätigter Stellung.
- Fig. 1
- a schematic representation of a brush cutter,
- Fig. 2
- a schematic section through the motor housing of the brushcutter
Fig. 1 . - Fig. 3
- the start enrichment facility of the brush cutter
Fig. 1 in operating position, - Fig. 4
- a schematic representation of the start enrichment device in the starting position,
- Fig. 5
- a schematic representation of the return means of the brushcutter when unactuated position of the actuating element,
- Fig. 6
- the reset from
Fig. 5 in the actuated position of the actuating element, - Fig. 7
- a partially sectioned view of the motor housing of the brush cutter with the starting device in the starting position,
- Fig. 8
- the brush cutter
Fig. 7 with the starting device in operating position, - Fig. 9
- a schematic representation of an embodiment of a restoring device with the actuating element in the unactuated position,
- Fig. 10
- the schematic representation
Fig. 9 with the actuator in the actuated position.
Wie
Dem Verbrennungsmotor 9 wird Kraftstoff/Luft-Gemisch über den in
Im Ansaugkanal 25 ist eine Drosselklappe 26 mit einer Drosselwelle 28 um eine Schwenkachse 32 schwenkbar gelagert. Außerhalb des Vergasergehäuses 24 ist an der Drosselwelle 28 ein Drosselhebel 30 festgelegt. In
Zum Starten des Verbrennungsmotors 9 wird die Startanreicherungseinrichtung in eine Startstellung, beispielsweise eine Warmstartstellung oder eine Kaltstartstellung, verstellt. Zum Verstellen der Startanreicherungseinrichtung 60 in eine Startstellung muss zunächst vom Bediener ein nicht gezeigter Gashebel des Freischneiders 1 gedrückt werden. Dadurch wird der Drosselhebel 30 aus dem Schwenkbereich des Chokehebels 31 verschwenkt, wie in
In
Wie
Die
Die
In der in
Die Nocken 48 und 57 verhindern auch, dass der Betriebsartensteller 22 im Betrieb in die Startstellung 53 der Startanreicherungseinrichtung 60 gestellt werden kann, wenn die Drehzahl oberhalb der Rückstelldrehzahl liegt. Die Nocken 48 bzw. 57 kommen bei einer Verstellung des Betriebsartenstellers 22 mit den Stellelementen 47 bzw. 55 in Kontakt. Da die Kurbelwelle 12 und die Fliehkraftkupplung 15 vergleichsweise schnell, nämlich mit einer Drehzahl oberhalb der Rückstelldrehzahl rotieren, wirken die Nocken 48 bzw. 57 wie eine durchgehende, zur Drehachse 20 rotationssymmetrische Begrenzung, die ein Verschieben der Stellelemente 47 bzw. 55 verhindert. Dadurch ist auf einfache Weise vermieden, dass der Betriebsartensteller 22 im Betrieb in die Startstellung 53 zurückgestellt werden kann.The
Claims (12)
dadurch gekennzeichnet, dass das Arbeitsgerät eine Rückstelleinrichtung (61, 62) besitzt, die die Startanreicherungseinrichtung (60) aus der Startstellung (53) in die Betriebsstellung (52) zurückstellt, wenn die Drehzahl der Kurbelwelle (12) eine Rückstelldrehzahl überschreitet.Implement with a tool and with an internal combustion engine (9), which is arranged in a housing of the working device and which drives the tool, wherein the internal combustion engine (9) has a rotatably mounted crankshaft (12), and wherein the working device has a start enrichment device (60). for the internal combustion engine (9), which comprises an operator-actuated mode selector (22), the start-enrichment device (60) having an operating position (52) and at least one starting position (53),
characterized in that the implement has return means (61, 62) for resetting the start enrichment means (60) from the starting position (53) to the operating position (52) when the rotational speed of the crankshaft (12) exceeds a reset speed.
dadurch gekennzeichnet, dass die Rückstelleinrichtung (61, 62) eine Verstellung der Startanreichungseinrichtung (60) in die Startstellung (53) bei einer Drehzahl oberhalb der Rückstelldrehzahl sperrt.Working device according to claim 1,
characterized in that the restoring device (61, 62) blocks an adjustment of the start-up device (60) into the starting position (53) at a rotational speed above the reset rotational speed.
dadurch gekennzeichnet, dass die Rückstelleinrichtung (61, 62) ein Stellelement (47, 55) besitzt, das zwischen einer betätigten Stellung (63) und einer unbetätigten Stellung (64) verstellbar ist, wobei die Stellung der Startanreicherungseinrichtung (60) an die Stellung des Stellelements (47, 55) gekoppelt ist und das Stellelement (47, 55) in Startstellung (53) der Startanreicherungseinrichtung (60) in der unbetätigten Stellung (64) und in Betriebsstellung (52) der Startanreicherungseinrichtung (60) der betätigten Stellung (63) steht.Tool according to claim 1 or 2,
characterized in that the restoring means (61,62) has an actuator (47,55) which is adjustable between an actuated position (63) and an unactuated position (64), the position of the start enrichment means (60) being at the position of Adjusting element (47, 55) is coupled and the actuating element (47, 55) in the starting position (53) of the Startanreicherungseinrichtung (60) in the unactuated Position (64) and in the operating position (52) of the Startanreicherungseinrichtung (60) of the actuated position (63) is.
dadurch gekennzeichnet, dass die Rückstelleinrichtung (61, 62) einen Nocken (48, 57) umfasst, der bei Drehzahlen oberhalb der Rückstelldrehzahl mit der Kurbelwelle (12) wirkverbunden ist und der auf das Stellelement (47, 55) wirkt.Working device according to claim 3,
characterized in that the restoring device (61, 62) comprises a cam (48, 57) which is operatively connected to the crankshaft (12) at rotational speeds above the reset rotational speed and which acts on the adjusting element (47, 55).
dadurch gekennzeichnet, dass der Verbrennungsmotor mit dem Werkzeug über eine drehzahlabhängig schaltende Kupplung wirkverbunden ist.Working device according to claim 4,
characterized in that the internal combustion engine is operatively connected to the tool via a speed-dependent switching clutch.
dadurch gekennzeichnet, dass der Nocken (48) an der Antriebsseite der Kupplung angeordnet ist.Working device according to claim 5,
characterized in that the cam (48) is arranged on the drive side of the clutch.
dadurch gekennzeichnet, dass die Kupplung eine Fliehkraftkupplung (15) mit mindestens einem Fliehgewicht (49) ist und dass der Nocken (48) an dem Fliehgewicht (49) festgelegt ist.Working device according to claim 6,
characterized in that the clutch is a centrifugal clutch (15) with at least one flyweight (49) and that the cam (48) is fixed to the flyweight (49).
dadurch gekennzeichnet, dass das Stellelement (47) in unbetätigter Stellung (64) zur Drehachse (20) der Kupplung einen Abstand (a) besitzt, der größer als der äußere Abstand (b) des Nockens (48) zur Drehachse (20) bei Drehzahlen unterhalb der Rückstelldrehzahl ist, und dass der Nocken (48) bei einer Drehzahl oberhalb der Rückstelldrehzahl einen größeren äußeren Abstand (d) zur Drehachse (20) besitzt als das Stellelement (47) in unbetätigter Stellung (64) und das Stellelement (47) in die betätigte Stellung (63) verstellt.Tool according to claim 6 or 7,
characterized in that the actuating element (47) in the unactuated position (64) to the rotational axis (20) of the coupling has a distance (a) which is greater than the outer distance (b) of the cam (48) to the rotational axis (20) at speeds is below the reset speed, and that the cam (48) at a speed above the reset speed has a greater outer distance (d) to the axis of rotation (20) than the actuator (47) in the unactuated position (64) and the actuator (47) in adjusted the actuated position (63).
dadurch gekennzeichnet, dass die Rückstelldrehzahl eine Einkuppeldrehzahl der Kupplung ist, und dass die Drehbewegung der Abtriebsseite der Kupplung als Stellbewegung für die Rückstellung der Startanreicherungseinrichtung (60) genutzt wird.Working device according to claim 5,
characterized in that the reset speed is a Einkuppeldrehzahl the clutch, and that the rotational movement of the output side of the clutch is used as an actuating movement for the provision of the Startanreicherungseinrichtung (60).
dadurch gekennzeichnet, dass der Nocken (57) an der Abtriebsseite der Kupplung angeordnet ist und dass der äußere Abstand (f) des Nockens (57) zur Drehachse (20) der Kupplung kleiner als der Abstand (e) des Stellelements (64) zur Drehachse (20) in unbetätigter Stellung (64) des Stellelements (55) ist.Tool according to claim 9,
characterized in that the cam (57) is arranged on the output side of the clutch and that the outer distance (f) of the cam (57) to the axis of rotation (20) of the clutch is smaller than the distance (e) of the actuating element (64) to the axis of rotation (20) in the de-energized position (64) of the actuating element (55).
dadurch gekennzeichnet, dass die Kupplung eine Kupplungstrommel (16) besitzt, an der der Nocken (57) festgelegt ist.Tool according to claim 9 or 10,
characterized in that the clutch has a clutch drum (16) on which the cam (57) is fixed.
dadurch gekennzeichnet, dass dem Verbrennungsmotor (9) über einen Ansaugkanal (55) Verbrennungsluft zugeführt wird, wobei in dem Ansaugkanal (25) mindestens ein verstellbares Ventilelement angeordnet ist, und wobei die Startanreicherungseinrichtung (60) auf die Stellung des Ventilelements wirkt.Tool according to one of claims 1 to 11,
characterized in that the internal combustion engine (9) via an intake passage (55) combustion air is supplied, wherein in the intake passage (25) at least one adjustable valve element is arranged, and wherein the Startanreicherungseinrichtung (60) acts on the position of the valve element.
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DE102012012801.0A DE102012012801A1 (en) | 2012-06-28 | 2012-06-28 | implement |
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EP (1) | EP2679357B1 (en) |
CN (1) | CN103573518B (en) |
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JP4868523B2 (en) | 2007-04-04 | 2012-02-01 | 京都電機器株式会社 | Auto choke device in engine |
JP2008303911A (en) | 2007-06-05 | 2008-12-18 | Toyota Motor Corp | Speed-change controller and vehicle control device |
DE202007008525U1 (en) * | 2007-06-14 | 2007-08-30 | Weber Maschinentechnik Gmbh | Gas adjustment device for adjusting speed of engine of soil compaction machine, has resetting units, which push adjusting lever automatically into idle position, when adjusting lever is in protection area |
DE102008007786A1 (en) | 2008-02-06 | 2009-08-13 | Andreas Stihl Ag & Co. Kg | Hand-held implement |
DE102009011684A1 (en) | 2009-03-04 | 2010-09-09 | Andreas Stihl Ag & Co. Kg | Hand-held implement |
DE102010009915B4 (en) * | 2009-03-21 | 2017-09-14 | Andreas Stihl Ag & Co. Kg | carburetor arrangement |
DE102009036372A1 (en) | 2009-08-06 | 2011-02-10 | Andreas Stihl Ag & Co. Kg | Portable hand-operated tool i.e. engine chain saw, has control unit for limiting speed of combustion engine to speed that is below coupling speed depending on state signal in operating position of starting device |
JP5278552B2 (en) | 2009-10-09 | 2013-09-04 | トヨタ自動車株式会社 | Vehicle control device |
DE102011105159B4 (en) | 2011-06-17 | 2021-12-30 | Andreas Stihl Ag & Co. Kg | Hand-held tool |
DE102012012798B4 (en) | 2012-06-28 | 2014-11-13 | Andreas Stihl Ag & Co. Kg | Working device with a braking device |
DE102012012799A1 (en) | 2012-06-28 | 2014-01-02 | Andreas Stihl Ag & Co. Kg | Working device with a braking device |
DE102012012827A1 (en) | 2012-06-28 | 2014-01-02 | Andreas Stihl Ag & Co. Kg | Start safety circuit in a working device with an internal combustion engine |
DE102013009154A1 (en) | 2013-05-31 | 2014-12-04 | Andreas Stihl Ag & Co. Kg | Hand-guided implement with an internal combustion engine |
DE102013009891A1 (en) | 2013-06-13 | 2014-12-18 | Andreas Stihl Ag & Co. Kg | Work tool with an internal combustion engine |
-
2012
- 2012-06-28 DE DE102012012801.0A patent/DE102012012801A1/en not_active Withdrawn
-
2013
- 2013-06-05 EP EP13002893.9A patent/EP2679357B1/en active Active
- 2013-06-17 RU RU2013127181A patent/RU2640850C2/en active
- 2013-06-28 US US13/931,551 patent/US9546636B2/en active Active
- 2013-06-28 CN CN201310266139.6A patent/CN103573518B/en active Active
Also Published As
Publication number | Publication date |
---|---|
RU2013127181A (en) | 2014-12-27 |
EP2679357B1 (en) | 2018-08-15 |
CN103573518B (en) | 2019-03-22 |
DE102012012801A1 (en) | 2014-01-02 |
US20140000543A1 (en) | 2014-01-02 |
RU2640850C2 (en) | 2018-01-12 |
US9546636B2 (en) | 2017-01-17 |
EP2679357A3 (en) | 2017-02-01 |
CN103573518A (en) | 2014-02-12 |
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