EP2679358B1 - Outil de travail doté d'un système de freinage - Google Patents

Outil de travail doté d'un système de freinage Download PDF

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Publication number
EP2679358B1
EP2679358B1 EP13002892.1A EP13002892A EP2679358B1 EP 2679358 B1 EP2679358 B1 EP 2679358B1 EP 13002892 A EP13002892 A EP 13002892A EP 2679358 B1 EP2679358 B1 EP 2679358B1
Authority
EP
European Patent Office
Prior art keywords
lever
choke
working implement
starting position
implement according
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.)
Not-in-force
Application number
EP13002892.1A
Other languages
German (de)
English (en)
Other versions
EP2679358A2 (fr
EP2679358A3 (fr
Inventor
Carel Karrar
Helmut Zimmermann
Werner Geyer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Andreas Stihl AG and Co KG
Original Assignee
Andreas Stihl AG and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Andreas Stihl AG and Co KG filed Critical Andreas Stihl AG and Co KG
Publication of EP2679358A2 publication Critical patent/EP2679358A2/fr
Publication of EP2679358A3 publication Critical patent/EP2679358A3/fr
Application granted granted Critical
Publication of EP2679358B1 publication Critical patent/EP2679358B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B17/00—Chain saws; Equipment therefor
    • B27B17/08—Drives or gearings; Devices for swivelling or tilting the chain saw
    • B27B17/083—Devices for arresting movement of the saw chain
    • 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 with a braking device of the type specified in the preamble of claim 1, which is known from the document DE 33 08 400 A1 is known.
  • a power saw which has a braking device.
  • the mode selector of the chainsaw is connected via a Bowden cable with a lever part, which acts on the band brake of the chainsaw. If the mode selector is set to the starting position, the band brake of the chain saw is inserted. For inserting and releasing the band brake comparatively large operating forces are required, so that the operation of the mode selector for the user is unergonomic.
  • the invention has for its object to provide a working device of the generic type, which has a high ease of use and a simple structure and in which the braking device is always actuated when the Startanreich ceremoniess adopted is in a starting position.
  • a locking device can be easily prevented that the starting position can be engaged by the operator when the braking device is not actuated.
  • An insertion of the starting position denotes an adjustment of the Startanreich réelles promoted in a starting position in which the Startanreich réelles promoted without external action, ie after releasing a Radioartstellers or the like remains. If the starting position can not be engaged, the operator knows that the braking device must first be inserted before the starting position can be inserted. As a result, accidental insertion of the starting position during operation is prevented because the braking device is not active during operation.
  • About the mode selector only the usual, relatively low operating forces must be applied to insert the starting position.
  • the locking device can also be operated with low operating forces. This allows a simple construction of the working device.
  • the start enrichment device has a valve element which is adjustable between an operating position and at least one starting position.
  • two start positions namely a hot start position and a cold start position are provided so that the implement can be started adapted to the ambient conditions and the temperature of the internal combustion engine.
  • the valve element is advantageously held by a fixing device in the starting position.
  • the locking device prevents fixation of the valve element by the fixing device in the starting position.
  • the valve element is advantageously spring-mounted in the direction of its operating position and, when the valve element is not fixed by the fixing device, is returned to its operating position by the spring force as soon as the operator releases the mode selector.
  • a valve element is in particular a choke element connected to a choke lever. If the choke element can not be adjusted to its starting position, usually no starting of the internal combustion engine is possible.
  • a valve element is advantageously a throttle element connected to a throttle lever. It has been found that it is sufficient to avoid adjusting a throttle element to its starting position, ie usually a slightly open position, in order to ensure that the internal combustion engine can not be started.
  • the choke element and the throttle element are advantageously adjusted to a starting position.
  • the free flow cross-section of an intake duct of the internal combustion engine, which releases the throttle element in the starting position, is advantageously greater than the released in the unactuated position of the throttle element flow cross-section.
  • the choke element advantageously does not significantly reduce the flow cross-section of the intake duct in the operating position.
  • the free flow cross section of the intake duct is advantageously reduced very clearly by the choke element.
  • the throttle lever acts to fix a starting position of at least one valve element with the choke lever together. This results in a simple structure.
  • the throttle lever and the choke lever are advantageously arranged in the usual manner on the outside of a carburetor of the working device.
  • the locking device advantageously prevents a fixation of a valve element in a starting position.
  • the locking device prevents in particular an engagement of the throttle lever on the choke lever. Due to the fact that the throttle lever can not engage the choke lever and fix the choke lever in the starting position of the choke element, the choke element does not remain in the starting position.
  • the choke element can therefore be adjusted to the starting position, but advantageously returns to the operating position after releasing the mode selector. Insertion of the starting position, that is to say an adjustment of the start enrichment device to a starting position in which the start enrichment device remains without external action, is not possible.
  • a fixation of the throttle element in its starting position can be prevented, in particular when the mode selector acts on the throttle element.
  • the throttle element is advantageously not fixed in its starting position, but returns after releasing the mode selector back to its operating position, so that the starting position can not be engaged, so the throttle element does not remain without external action in the starting position.
  • a simple structure is achieved when the choke lever is mounted on a choke shaft and the throttle lever on a throttle shaft.
  • the choke lever is rotatably held on the choke shaft and the throttle lever against rotation of the throttle shaft.
  • at least one of the levers is slidably mounted on its shaft in the longitudinal direction of its pivot axis.
  • the locking device advantageously has a displacement contour which moves at least one of the levers in the longitudinal direction of its pivot axis. This can be achieved in a simple way that the levers can not interfere with each other.
  • an already inserted starting position is advantageously also released again when the braking device is released.
  • the displacement of the lever is advantageously against the force of a spring.
  • the spring is advantageously a torsion spring which biases the respective lever in its unactuated position.
  • the throttle lever is spring-loaded in the direction of the fully closed position of the throttle element and the choke lever in the direction of the fully open position of the choke element.
  • a simple construction can also be achieved if the locking device prevents movement of the valve element into the starting position. This can be done in a simple manner in that the locking device extends in the path of movement of one of the moving during insertion of the starting position components.
  • a simple structure is achieved when the valve element is to be actuated via a coupling rod of the mode selector and the locking device is arranged in the adjustment path of the coupling rod.
  • the locking device blocks the path of movement of the mode selector, for example by blocking the shift gate.
  • the path of movement of a lever connected to the valve element in particular a choke lever or throttle lever can be blocked by the locking device.
  • the valve element is spring-loaded in the direction of its operating position and pivots back when releasing the mode selector due to the spring force in its operating position.
  • the locking device has an actuating contour which releases the start enrichment device from the starting position when the braking device is released while the start enrichment device is in the starting position.
  • the actuating device for the braking device is advantageously a hand guard.
  • the working device is in particular a hand-held implement, advantageously a power saw.
  • a simple construction is achieved when the braking device comprises a differential belt brake.
  • a differential band brake has a self-reinforcing effect and can be operated with minimal operating forces. This results in an ergonomic operation.
  • Fig. 1 shows as an exemplary embodiment of an implement a hand-held power saw 1.
  • the power saw 1 has a housing 2 to which a rear handle 3 and a handle tube 4 are fixed.
  • the rear handle 3 and the handle tube 4 are of a arranged in the housing 2 internal combustion engine 11 (FIG. Fig. 2 ) vibration decoupled.
  • a throttle lever 8 and a throttle lever lock 9 are pivotally mounted.
  • Adjacent to the rear handle 3, a mode selector 10 projects out of the housing 2.
  • a guide rail 6 protrudes from the housing 2 to the front.
  • On the guide rail 6, a saw chain 7 is arranged circumferentially, which is driven by the engine 11.
  • a hand guard 5 is arranged, which is pivotally mounted on the housing 2.
  • Fig. 2 shows the structure of the drive of the power saw 1 in detail.
  • the internal combustion engine 11 has a cylinder 16 in which a piston 18 is reciprocated.
  • the piston 18 drives via a connecting rod 19 a rotatably mounted in a crankcase 17 crankshaft 12.
  • the internal combustion engine 11 is advantageously a single-cylinder engine, in particular a two-stroke engine.
  • a fan 20 is set, which serves to promote cooling air for the engine 11.
  • a starting device 21 is arranged, which serves to crank the internal combustion engine 11.
  • the starting device 21 is advantageously a manually operated picking device, such as a pull starter. However, the starting device 21 may also be electrically operated.
  • centrifugal clutch 13 At the side facing away from the fan 20 of the engine 11, a centrifugal clutch 13 is fixed to the crankshaft 12.
  • the centrifugal clutch 13 has a clutch drum 14, which at the same time as a brake drum for a braking device 55 (FIG. Fig. 3 ) serves.
  • the brake device 55 is a band brake and has one around the clutch drum 14 looped brake band 15.
  • On the clutch drum 14, a drive pinion 22 is fixed, which serves to drive the saw chain 7 to the guide rail 6.
  • the operator When starting the internal combustion engine 11, the operator must use the braking device 55 (FIG. Fig. 3 ), so insert the brake, so that the brake band 15 rests against the clutch drum 14 and the saw chain 7 brakes.
  • the braking device 55 is to be operated via the hand guard 5.
  • the hand guard 5 As Fig. 3 shows, the hand guard 5 is pivotally mounted about a pivot axis 31.
  • the hand guard 5 has a bearing portion 34 adjacent to which a first arm 25 of a toggle mechanism 24 extends.
  • the first arm 25 is connected via a second arm 26 with a pivot lever 27.
  • the pivot lever 27 forms with a brake spring 28 and the toggle mechanism 24 a trigger mechanism 23 for the braking device 55.
  • the bearing section 34 takes on a movement of the hand guard 5 in the direction of arrow 32, ie in the direction of the saw chain 7 forward, the first arm 25th the toggle mechanism 24 with.
  • the toggle mechanism 24 is thereby guided over its dead center.
  • the brake spring 28 can pivot the pivot lever 27 in the direction of the arrow 33 and thereby move a first end 29 of the brake band 15 away from the clutch drum 14.
  • a second end 30 of the brake band 15 is fixedly mounted on the housing 2.
  • the hand guard 5 is pivoted in the opposite direction to the arrow 32, the hand guard 5 is thus pulled in the direction of the handle tube 4.
  • the bearing portion 34 takes the first arm 25 in the in Fig. 3 shown position with.
  • the brake spring 28 is tensioned, and the toggle mechanism 24 is guided over its dead center, so that the force exerted by the brake spring 28 via the toggle mechanism 24 is intercepted.
  • the hand guard 5 returns after actuation in the direction of arrow 32 or after pressing in the opposite direction always back to its original position.
  • a return spring not shown, is provided.
  • Another braking device 55 may be advantageous for the power saw 1.
  • the structure of the braking device 55 is independent of the hereinafter described construction of a locking device for the start enrichment device of the power saw 1.
  • Fig. 4 schematically shows a carburetor 35 of the engine 11.
  • the carburetor 35 has a carburetor housing 45, in which an intake passage section 36 is formed, via which the engine 11, fuel / air mixture is supplied.
  • a throttle valve 37 is mounted with a throttle shaft 39 pivotally about a pivot axis 84.
  • a choke flap 38 with a choke shaft 40 is mounted pivotably about a pivot axis 85 upstream of the throttle flap 37.
  • other choke elements or throttle elements for example, cylindrical choke or throttle elements may be provided.
  • a throttle lever 41 is fixed to the throttle shaft 39 and a choke lever 42 at the choke shaft 40.
  • the intake passage section 36 is in Fig. 4 shown cut and throttle lever 41 and choke lever 42 in side view.
  • the throttle lever 41 is non-rotatably connected to the throttle shaft 39 and the choke lever 42 rotatably connected to the choke shaft 40.
  • Throttle lever 41 and throttle shaft 39 and choke lever 42 and choke shaft 40 may also be mutually rotatable, advantageously by a structurally predetermined, small angular amount, for example Compensation of manufacturing tolerances.
  • the choke flap 38 can be actuated via a coupling rod 46 suspended on the choke lever 42, ie pivoted about the pivot axis 85.
  • the coupling rod 46 is connected to the mode selector 10 in conjunction.
  • the coupling rod 46 is mounted on the mode selector 10.
  • the mode selector 10 together with the coupling rod 46, the choke lever 42 and the choke flap 38, forms a start enrichment device of the internal combustion engine 11.
  • the throttle lever 41 is also part of the start enrichment device. In order to set a start position 48 of the start enrichment device, first the throttle lever 41 has to be pivoted out of the swivel range of the choke lever 42. For this purpose, an operator must have the in Fig. 1 Press the throttle lever 8 shown.
  • Fig. 5 shows the carburetor 35 in starting position 48.
  • the in Fig. 5 shown start position 48 is a warm start position.
  • a cold start position can also be provided.
  • start position 48 of the throttle lever 41 fixes the choke lever 42.
  • the throttle lever 41 is located on a shoulder 49 of the choke lever 42 at.
  • the throttle 37 is spring loaded towards its fully closed position and the choke flap 38 is toward its fully open position.
  • the throttle lever 41 and the choke lever 42 fix each other.
  • the throttle valve 37 is slightly open.
  • the choke flap 38 is partially closed.
  • the choke flap 38 may, for example, at an angle of about 30 ° to 60 ° relative to the in Fig. 4 shown operating position 83 to be pivoted.
  • the choke flap 38 reduces the free flow cross section through the intake passage section 36 the start position 48 the mode selector 10 ( Fig. 1 ) let go. Throttle 37 and choke flap 38 remain in their starting positions 82 and 86 stand. This allows the operator with the free hand, the starting device 21 ( Fig. 2 ) and at the same time hold the chainsaw 1 on the handle tube 4.
  • Fig. 6 shows a first embodiment of a barrier means 56 for the start enrichment device.
  • the braking device 55 is not inserted.
  • a control lever 52 is connected via not shown, which is also pivotally mounted about the pivot axis 31. If the hand guard 5 was actuated in the direction of the arrow 51, that is to say attracted to the grip tube 4, then the adjusting lever 52 is in the position shown in FIG Fig. 6 shown position.
  • the braking device 55 is not actuated, so the brake band 15 so not tightly wrapped around the clutch drum 14.
  • an actuating element 53 is fixed, which acts on a blocking element 57.
  • the actuator 53 is a coupling rod, but it can also be another, also a multi-part actuator 53 may be provided.
  • the blocking element 57 is stirred via guides, not shown, on the housing 2, which are advantageous in Fig. 6 are arranged in front of the plane of the drawing.
  • the blocking element 57 is designed as a slide. Another design of the locking member 57, for example as a pivot lever or the like, may be advantageous.
  • the blocking element 57 is arranged adjacent to the carburetor housing 45 and projects into the region of the choke lever 42. In the side view in FIG Fig. 6 the throttle lever 41 is covered by the blocking element 57.
  • Fig. 6 is also the structure of the mode selector 10 shown in detail.
  • the mode selector 10 is pivotally mounted about a pivot axis 54 on the housing 2 and has an operating section 58 which protrudes from the housing 2 and can be operated by the operator.
  • a spring 63 is held, which serves as a contact spring for an ignition device of the internal combustion engine 11.
  • the spring 63 is applied to a short-circuit contact and short-circuits the ignition of the internal combustion engine 11, so that the internal combustion engine 11 stops.
  • the spring 63 can simultaneously define detent positions of the mode selector 10.
  • Fig. 6 shows the internal combustion engine 11 and the carburetor 35 are covered by a hood 59 of the housing 2.
  • the blocking element 57 has a displacement contour 47, which in the in FIGS. 6 and 7 shown blocking position 80 laterally displaces the throttle lever 41 in the direction of the carburetor housing 35.
  • the choke lever 42 and the throttle lever 41 are arranged in staggered planes and can not come into engagement with each other.
  • the throttle lever 41 has been displaced against the force of a spring 61 in the longitudinal direction of the pivot axis 84.
  • the spring 61 is a torsion spring that biases the throttle 37 toward its fully closed position.
  • the choke lever 42 and the choke flap 38 are spring-loaded by a spring 50 in the direction of the fully open position of the choke flap 38.
  • a spring 50 in the direction of the fully open position of the choke flap 38.
  • the blocking element 57 acts on the choke lever 42 and shifts the choke lever 42 laterally out of the swiveling range of the throttle lever 41, in order to prevent the choke lever 42 and throttle lever 41 from locking.
  • FIGS. 9 to 11 show the locking device 56 in the release position 81.
  • the operator To adjust the locking device 56 from the blocking position 80 in the release position 81, the operator must the hand guard 5 in the direction of arrow 62 in Fig. 9 pivot, ie in the direction of the saw chain 7.
  • the braking device 55 is actuated and the brake band 15 tightened around the clutch drum 14.
  • the hand guard 5 takes the lever 52 in the direction of arrow 65 in Fig. 9 With.
  • the blocking element 57 is pulled away from the choke lever 42 and throttle lever 41 in the direction of the hand guard 5.
  • Fig. 10 shows the displacement contour 47 thereby disengaged from the throttle lever 41.
  • FIG. 11 shows the throttle lever 41 was thereby pressed by the spring 61 away from the carburetor housing 45 and placed in the same plane in which the choke lever 42 is arranged. If the mode selector 10 in the direction of arrow 60 ( Fig. 9 ), after the throttle lever 8 has been operated for pivoting the throttle lever 41, the in Fig. 5 shown starting position 48 or a cold start position, not shown, to reach the mode selector 10 must be pressed even further in the direction of arrow 60, are set. In the in the FIGS. 9 to 11 Accordingly, the operator can set the starting position 48 and then release the mode selector 10 due to the fixation of the choke lever 42 by the throttle lever 41. As a result, the operator has a hand free to start the starting device 21 (FIG. Fig. 2 ) too Press and can start the engine 11 so. Due to the blocking device 56, starting of the internal combustion engine 11 is possible only when the braking device 55 is in its actuated position and the saw chain 7 is braked.
  • FIGS. 12 to 15 show a locking device 66 in a blocking position 80.
  • the same reference numerals as in the preceding figures indicate corresponding components.
  • the locking device 66 has a blocking element 67, on which the actuating element 53 acts.
  • the blocking element 67 can also be guided on the housing 2.
  • In the blocking position 80 shown is an in Fig. 13 shown locking contour 70 is arranged in the path of movement of the coupling rod 46.
  • the coupling rod 46 may not or only slightly in the direction of in Fig. 13 shown arrow 68 are pivoted.
  • the coupling rod 46 can not be pivoted until the choke flap 38 reaches the starting position 48.
  • the operator can not actuate the mode selector 10 or not far enough in the direction of the arrow 60, and inserting a starting position 48 is not possible.
  • a pivoting of the choke lever 42 about the pivot axis 85 is blocked by the locking contour 70.
  • the throttle lever 41 and the choke lever 42 are in the same plane, the throttle lever 41 can not fix the choke lever 42 in a start position 48 since the choke lever 42 can not be pivoted sufficiently far about the pivot axis 85.
  • the blocking contour 70 prevents a pivoting of the throttle lever 41. Even if the throttle valve 37 is not in its starting position 86, starting the internal combustion engine 9 is usually not possible.
  • FIGS. 16 to 18 show the locking device 66 in the release position 81.
  • the release position 81 is by pivoting the hand guard 5 in the direction of arrow 62 in Fig. 16 inserted.
  • the braking device 55 is actuated and the brake is engaged.
  • the adjusting lever 52 pivots in the direction of the arrow 65 about the pivot axis 31, whereby the blocking element 67 is moved with the locking contour 70 from the pivoting range of the coupling rod 46.
  • Characterized in that the locking contour 70 is not arranged in the pivoting range of the coupling rod 46 can the mode selector 10 in the direction of arrow 60 ( Fig. 16 ) is pivoted until reaching the starting position 48 and thereby the starting position 48 (FIG. Fig. 5 ) be inserted.
  • FIGS. 19 to 21 show an embodiment of a locking device 76 having a blocking element 77.
  • the blocking element 77 has both a displacement contour 47 and a blocking contour 70.
  • blocking position 80 is a pivoting of the mode selector 10 is not possible because the locking contour 70 ( Fig. 21 ) is arranged in Verschwenkweg the coupling rod 46 and thereby prevents an adjustment of the mode selector 10.
  • a coupling between throttle lever 41 and choke lever 42 is not possible because the displacement contour 47 has the throttle lever 41 against the force of the spring 61 laterally disengaged and moved from the pivoting range of the choke lever 42. As a result, latching of throttle lever 41 and choke lever 42 is not possible.
  • the locking device 76 is shown in the release position 81.
  • the displacement contour 47 is no longer in engagement with the throttle lever 41, so that throttle lever 41 and choke lever 42 are arranged in the same plane and can engage with each other.
  • the locking contour 70 has moved out of the pivoting region of the coupling rod 46, so that the choke lever 42 can be pivoted via the coupling rod 46 by pivoting the operating mode actuator 10. This allows the in Fig. 5 shown start position 48 inserted and then the mode selector 10 are released. Due to the locking between choke lever 42 and throttle lever 41, the mode selector 10 stops in the starting position 48.
  • the choke lever 42 in addition to or alternatively to the throttle lever 41, can also be displaced in the longitudinal direction of its pivot axis 85 to place choke lever 42 and throttle lever 41 in staggered planes and to prevent the levers 41, 42 from engaging with each other can come.
  • the locking devices 66 and 76 have on the blocking element 67 and on the blocking element 77 an actuating contour 64, which in Fig. 13 and Fig. 19 is shown in detail.
  • the actuating contour 64 is formed as a slope.
  • the actuating contour 64 returns the choke lever 42 to the operating position 83 of the choke flap 38 when the brake device 55 is released while the start enrichment device is in the start position 48.
  • the starting position 48 is achieved in the locking devices 56 and 66 via the displacement contour 47, which disengages the throttle lever 41 laterally when the braking device 55 is released. This ensures that an inserted starting position 48 is released when the braking device 55 is placed in the released position of the brake.
  • the throttle lever 41 may consist of an elastic material, such as a plastic.
  • Fig. 25 shows an alternative embodiment for a braking device 90.
  • the braking device 90 has a differential belt brake 91, which includes the brake band 15 and the clutch drum 14.
  • the same reference numerals as in the preceding figures designate corresponding elements.
  • the clutch drum 14 rotates in operation in a rotational direction 97 about a rotation axis 98.
  • the differential band brake 91 has a pivot lever 92, on which the hand guard 5 acts.
  • the braking device 91 is shown in the braked position in which the brake band 15 tightly wraps around the clutch drum 14.
  • the pivot lever 91 is pivotally mounted about a pivot axis 93 and biased by a spring 96 in the direction of the unactuated, unbraked position of the differential belt brake 91.
  • the brake band 15 has a first end 94 and a second end 95.
  • the two ends 94 and 95 of the brake band are fixed at different distances from the pivot axis 93 on the pivot lever 92.
  • the first end 94 has the pivot axis 93 at a distance a, which is significantly smaller than a distance b of the second end 95 to the pivot axis 93.
  • the distances a and b are measured perpendicular to the longitudinal direction of the ends 94 and 95.
  • the distance b may advantageously be about 2 times to about 20 times the distance a.
  • the direction of rotation 97 is directed on the outer circumference of the clutch drum 14 from the first end 94 to the second end 95. As a result, the differential band brake acts self-reinforcing.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical & Material Sciences (AREA)
  • Means For Warming Up And Starting Carburetors (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Portable Power Tools In General (AREA)
  • Harvester Elements (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)

Claims (15)

  1. Appareil de travail avec un outil, un moteur à combustion interne (11) qui sert à entraîner l'outil, un dispositif d'enrichissement au démarrage, pour le moteur à combustion interne (11), qui présente au moins une position de démarrage (48) et qui est à actionner par l'intermédiaire d'un sélecteur de mode de fonctionnement (10), un dispositif de freinage (55, 90) qui freine l'outil, en position actionnée, et débloque l'outil, en position non actionnée, et un dispositif d'actionnement pour le dispositif de freinage (55, 90),
    caractérisé en ce que l'appareil de travail comporte un dispositif de blocage (56, 66, 76) qui, dans une position de blocage (80), empêche une mise en place de la position de démarrage (48), étant précisé que le dispositif de freinage (55, 90) est couplé avec le dispositif de blocage (56, 66, 76) de telle sorte que ce dernier, dans la position non actionnée du dispositif de freinage (55, 90), est en position de blocage (80).
  2. Appareil de travail selon la revendication 1,
    caractérisé en ce que le dispositif d'enrichissement au démarrage comporte au moins un élément formant soupape qui est apte à être déplacé entre une position de fonctionnement (83) et une position de démarrage (82, 86).
  3. Appareil de travail selon la revendication 2,
    caractérisé en ce que l'élément formant soupape est retenu dans la position de démarrage (82, 86) par un élément de fixation, et en ce que le dispositif de blocage (56, 66, 76) empêche une fixation de l'élément formant soupape dans la position de démarrage (82, 86).
  4. Appareil de travail selon la revendication 2 ou 3,
    caractérisé en ce qu'un élément formant soupape est un élément formant starter qui est relié à un levier de starter (42).
  5. Appareil de travail selon la revendication 4,
    caractérisé en ce qu'un élément formant soupape est un élément d'étranglement qui est relié à un levier d'étranglement (41).
  6. Appareil de travail selon la revendication 5,
    caractérisé en ce que le levier d'étranglement (41) coopère avec le levier de starter (42) en vue de fixer une position de démarrage (82, 86) d'au moins un élément formant soupape.
  7. Appareil de travail selon la revendication 6,
    caractérisé en ce que le dispositif de blocage (56, 76) empêche une prise du levier d'étranglement (41) sur le levier de starter (42).
  8. Appareil de travail selon la revendication 6 ou 7,
    caractérisé en ce que le levier de starter (42) est monté sur un axe de starter (39), étant précisé que l'un au moins des leviers (41, 42) est monté coulissant dans le sens longitudinal de son axe de pivotement (84, 85).
  9. Appareil de travail selon la revendication 8,
    caractérisé en ce que le dispositif de blocage (56, 76) présente un contour de coulissement (47) qui déplace l'un au moins des leviers, parmi le levier d'étranglement (41) et le levier de starter (42), dans le sens de son axe de pivotement (84, 85).
  10. Appareil de travail selon l'une des revendications 2 à 9,
    caractérisé en ce que le dispositif de blocage (66, 76) empêche un déplacement d'un élément formant soupape jusqu'à la position de démarrage (82, 86).
  11. Appareil de travail selon la revendication 10,
    caractérisé en ce que le sélecteur de mode de fonctionnement (10) déplace l'élément formant soupape par l'intermédiaire d'une tige de couplage (46), et en ce que le dispositif de blocage (66, 76) est disposé sur la trajectoire de la tige de couplage (46).
  12. Appareil de travail selon l'une des revendications 2 à 11,
    caractérisé en ce que l'élément formant soupape est contraint par ressort en direction de sa position de fonctionnement (83).
  13. Appareil de travail selon l'une des revendications 1 à 12,
    caractérisé en ce que le dispositif de blocage (66, 76) présente un contour d'actionnement (64) qui sort le dispositif d'enrichissement au démarrage de la position de démarrage (48) si le dispositif de freinage (55, 90) est desserré dans la position de démarrage (48) du dispositif d'enrichissement au démarrage.
  14. Appareil de travail selon l'une des revendications 1 à 13,
    caractérisé en ce que le dispositif d'actionnement pour le dispositif de freinage (55, 90) est un arceau de protection des mains (5).
  15. Appareil de travail selon l'une des revendications 1 à 14,
    caractérisé en ce que le dispositif de freinage (90) comprend un frein différentiel à bande (91).
EP13002892.1A 2012-06-28 2013-06-05 Outil de travail doté d'un système de freinage Not-in-force EP2679358B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102012012799.5A DE102012012799A1 (de) 2012-06-28 2012-06-28 Arbeitsgerät mit einer Bremseinrichtung

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EP2679358A2 EP2679358A2 (fr) 2014-01-01
EP2679358A3 EP2679358A3 (fr) 2014-12-17
EP2679358B1 true EP2679358B1 (fr) 2016-02-03

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US (1) US9470143B2 (fr)
EP (1) EP2679358B1 (fr)
CN (1) CN103527326B (fr)
DE (1) DE102012012799A1 (fr)
RU (1) RU2629107C2 (fr)

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CN111936735B (zh) * 2019-03-05 2022-02-18 本田技研工业株式会社 进气部件的开闭机构
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Publication number Publication date
RU2013127179A (ru) 2014-12-27
RU2629107C2 (ru) 2017-08-24
US20140000542A1 (en) 2014-01-02
EP2679358A2 (fr) 2014-01-01
CN103527326A (zh) 2014-01-22
US9470143B2 (en) 2016-10-18
EP2679358A3 (fr) 2014-12-17
CN103527326B (zh) 2017-08-11
DE102012012799A1 (de) 2014-01-02

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