EP4169669A1 - Appareil de travail guidé à la main - Google Patents

Appareil de travail guidé à la main Download PDF

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Publication number
EP4169669A1
EP4169669A1 EP21203947.3A EP21203947A EP4169669A1 EP 4169669 A1 EP4169669 A1 EP 4169669A1 EP 21203947 A EP21203947 A EP 21203947A EP 4169669 A1 EP4169669 A1 EP 4169669A1
Authority
EP
European Patent Office
Prior art keywords
working device
helical spring
holding
handle
holding elements
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.)
Pending
Application number
EP21203947.3A
Other languages
German (de)
English (en)
Inventor
Markus Nefzger
Andreas Schulz
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
Priority to EP21203947.3A priority Critical patent/EP4169669A1/fr
Priority to US17/970,177 priority patent/US20230128835A1/en
Priority to CN202211292401.XA priority patent/CN116000373A/zh
Publication of EP4169669A1 publication Critical patent/EP4169669A1/fr
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/006—Vibration damping means
    • 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
    • B27B17/0033—Devices for attenuation of vibrations
    • 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
    • B27B17/0008—Means for carrying the chain saw, e.g. handles

Definitions

  • the invention relates to a hand-operated tool of the type specified in the preamble of claim 1.
  • a hand-held working device in which the motor unit and handle unit are connected to one another via at least one anti-vibration element. Retaining elements are screwed into the ends of the coil springs.
  • the object of the invention is to provide a hand-held working device with improved guidance properties and improved vibration decoupling.
  • the present invention now provides for a corresponding stop to be formed by the end faces of the holding elements. Additional components for the stop can thereby be avoided. If the end faces of the holding elements are oriented obliquely to the loading direction, when the end faces of the holding elements are pressed against one another, a force is exerted perpendicularly to the longitudinal central axis of the helical spring of the anti-vibration element. This force can cause further relative movement between the motor unit and the handle unit, which is undesirable.
  • Such a force perpendicular to the longitudinal central axis of the coil spring can load components of the implement in unusual directions and therefore lead to overloading.
  • the end faces of the holding elements have centering elements which center the holding elements with respect to one another.
  • At least one control element for controlling the drive motor is advantageously arranged on the handle. If the hand-held power tool is a chainsaw, the handle is particularly preferably a rear handle.
  • the holding elements are advantageously dimensionally stable.
  • the holding elements can be made of dimensionally stable plastic, for example.
  • one centering element is designed as a cone and the other centering element as a depression.
  • the cone and the depression are advantageously matched to one another in terms of their contour.
  • the depression also advantageously has a conical contour.
  • the first holding element is screwed into the first end of the helical spring
  • the second holding element is screwed into the second end of the helical spring.
  • the holding elements serve to fix the helical spring, as a stop and to center the holding elements in relation to one another. This achieves a simple structure with a small number of components.
  • the arrangement of the holding elements inside the helical spring results in a small installation space.
  • the outer circumference of the coil spring is advantageously exposed over the entire length of the coil spring.
  • the holding elements do not extend radially outside of the helical spring.
  • the longitudinal center axis of the helical spring of the first anti-vibration element is in a parked position of the implement in which the The implement is standing on a level, horizontal surface, inclined at an angle to the surface.
  • the angle of inclination is preferably more than 0° and less than 90°.
  • the angle of inclination is in particular more than 45°, preferably more than 60°.
  • An angle of inclination of 60° to 80° is considered to be particularly preferred.
  • a force directed upwards on a rear handle of the working device in the parking position of the working device acts with a comparatively large proportion in the longitudinal direction of the coil spring.
  • the longitudinal center axis of the helical spring of the first anti-vibration element can be aligned parallel to the parking surface in the parking position.
  • the longitudinal central axis is particularly preferably inclined at an angle of more than 0°, in particular of more than 45°, preferably by approximately 90°, to the longitudinal direction of the implement.
  • the central longitudinal axis of the helical spring preferably runs obliquely, in particular perpendicular to the plane of a guide rail of the motor saw.
  • the cone angle of the centering element designed as a cone is preferably smaller than the angle of inclination of the longitudinal central axis of the helical spring to the parking surface in the parking position. This ensures that when the handle is moved upwards into the parking position on the cone, a force is generated which causes the holding elements to be centered relative to one another.
  • the cone angle of the centering element designed as a cone is preferably at least 5° smaller than the angle of inclination of the longitudinal central axis of the helical spring.
  • the first anti-vibration element has a tear-off protection, the ends of which are held in the holding elements.
  • the holding elements each have a Have slot that extends from the periphery of a passage opening for the tear-off to the outer periphery of the retaining element.
  • the passage opening advantageously widens in at least one longitudinal section in the direction of the end face of the holding element. Due to the fact that the passage opening widens in at least one longitudinal section in the direction of the end face of the holding element, during relative movements of the motor unit and handle unit in a direction perpendicular to the longitudinal center axis of the helical spring, the tear-off protection later rests on the holding element. As a result, vibrations between the motor unit and the handle unit are only transmitted in the event of larger lateral deflections, ie shear loads on the helical spring.
  • the end faces of the holding elements are at a distance from one another when the implement is not under load.
  • the distance is at most 30%, in particular at most 20%, of a length of the helical spring.
  • the distance is advantageously at most 3 cm, in particular at most 2 cm.
  • the holding elements are made of plastic.
  • the end faces of the holding elements can consist of a different plastic than the base body of the holding elements.
  • the centering elements can preferably come into contact with one another when the handle is moved in a direction that corresponds to an upward movement when the implement is in the parked position. Such a movement occurs, for example, with large loads. Overloading of the components should be prevented here.
  • the centering elements advantageously do not come into contact with one another, so that good vibration decoupling of the handle unit and motor unit is achieved during operation.
  • the first anti-vibration element is preferably arranged adjacent to a front side of the handle facing the tool.
  • the front of the handle is preferably the area that is closer to an operator's thumb and forefinger than to an operator's little finger in the usual gripping position during operation.
  • the hand-held tool is preferably a chainsaw.
  • the hand-held tool is in particular a hand-held tool.
  • the fastening elements are advantageously made of an elastic material, in particular an elastomer, at least in the region of the centering elements.
  • the elastic material is advantageously injection molded onto a base body made of dimensionally stable material, for example in a two-component injection molding process.
  • the hand-held working device 1 shows a hand-held working device 1.
  • a hand-held working device ie a working device 1 that is carried by the user during operation
  • the hand-held implement 1 in 1 is a chainsaw.
  • the working device 1 has a motor unit 2 and a handle unit 3 .
  • the handle unit 3 includes a rear handle 7 on which a control element 8 is arranged.
  • the operating element 8 is arranged in the area of an index finger and/or middle finger of an operator.
  • the operating element 8 is arranged near a front side 16 of the rear handle 7 .
  • the front side 16 is the side of the handle 7 that is closer to a tool of the implement 1.
  • the thumb and/or forefinger of an operator's hand are arranged near the front side 16.
  • the handle unit 3 also includes a handle tube 6.
  • the tool 1 can alternatively also be a cut-off machine.
  • the working device 1 of the exemplary embodiment has a saw chain 5 which forms the tool of the working device 1 .
  • the saw chain 5 runs around a guide rail 4 arranged.
  • the drive motor 10 is part of the motor unit 2.
  • the motor unit 2 is coupled to the handle unit 3 via a number of anti-vibration elements 11, 12, 13, 14.
  • the working device 1 also has a hand guard 9 which is arranged on the side of the handle tube 6 facing the saw chain 5 .
  • the hand guard 9 can be provided for triggering a braking device, not shown, for the saw chain 5 .
  • the working device 1 is shown in a parking position 18 in which the working device 1 is on a flat, horizontal parking surface 19 .
  • the handle unit 3 is connected to the motor unit 2 via a first anti-vibration element 11 comprising a coil spring 20 .
  • the coil spring 20 is held on the motor unit 2 by a first holding element 21 and on the handle unit 3 by a second holding element 22 .
  • the coil spring 20 has a central longitudinal axis 23 .
  • the longitudinal central axis 23 is inclined at an angle ⁇ to the storage surface 19 .
  • the angle ⁇ is more than 0° and less than 90°.
  • the angle ⁇ is preferably more than 45°.
  • An angle ⁇ of 60° to 80° is considered particularly preferred.
  • the longitudinal center axis 23 runs parallel to the storage area 19 .
  • the longitudinal central axis 23 it is particularly preferred for the longitudinal central axis 23 to be oriented obliquely, in particular perpendicular to the plane of the drawing 1 .
  • the longitudinal central axis 23 is preferably arranged perpendicular to the guide rail 4 level.
  • the drive motor 10 is an internal combustion engine that draws in combustion air via an air filter 26 and an intake duct 27 .
  • the internal combustion engine is preferably a two-stroke engine, in particular a single-cylinder engine.
  • the longitudinal central axes of the anti-vibration elements 12, 13 and 14 are arranged parallel to the guide rail 4 level.
  • the handle unit 3 has an operating fluid tank 15, in particular a fuel tank.
  • the resource tank 15 is preferably integrated into a handle housing of the handle unit 3 .
  • the second holding element 22 is arranged on the side of the operating medium tank 15 which is at the top in the parking position 18 .
  • the working device 1 has a longitudinal plane 42 .
  • the longitudinal plane 42 is preferably parallel to the rear handle 7.
  • the longitudinal plane 42 is parallel to the guide rail 4 level.
  • the longitudinal center axes of the helical springs of the anti-vibration elements 12 and 13 are perpendicular to the longitudinal plane 42.
  • the longitudinal center axis 23 of the first anti-vibration element 11 runs parallel to the longitudinal plane 42. A different alignment of the first anti-vibration element 11 can, however, also be advantageous.
  • FIG 3 shows an embodiment of a working device 1. Also in 3 Tool 1 shown is a hand-held tool, in the exemplary embodiment a hand-held tool.
  • the working device 1 is a chainsaw in the exemplary embodiment.
  • the construction of the chain saw 1 from the motor unit 2 and the handle unit 3, which are connected to one another via anti-vibration elements 11, 12, 13 and 14, corresponds to that in FIG 1 illustrated and to 1 described structure.
  • the implement 1 off 3 differs from the work tool 1 is that the drive motor 10 according to the embodiment 3 is an electric motor.
  • the energy for the electric motor is provided by a rechargeable battery 28 .
  • a different structure and/or a different type of energy supply for the drive motor 10 can also be advantageous.
  • the Figures 4 to 9 12 show the structure of the first anti-vibration element 11 in detail.
  • the coil spring 20 has a first end 24 in which the first retaining element 21 is screwed in. This is also in figure 5 recognizable.
  • the coil spring 20 has a second end 25 into which the second holding element 22 is screwed, as also in FIG figure 5 shown.
  • the second holding element 22 is advantageously arranged on a side of a section of the handle unit 3 that is at the top in the storage position 18 . If the implement 1 has an operating fluid tank 15 on the handle unit 3, the second holding element 22 is advantageously arranged on the operating fluid tank 15, in the exemplary embodiment on the side of the operating fluid tank 15 that is at the top in the parking position 18.
  • the second holding element 22 is advantageously arranged in a corresponding position.
  • the coil spring 20 is advantageously exposed at its outer periphery.
  • the coil spring 20 is advantageously not held on its outer circumference.
  • the retaining elements 21 and 22 advantageously do not fix the coil spring 20 on its outer circumference.
  • FIG 5 shows the first anti-vibration element 11 in the unloaded state of the handle unit 3 and motor unit 2.
  • the helical spring 20 has a length b measured parallel to the longitudinal center axis 23.
  • the first end 24 of the coil spring 20 is held on the first holding element 21 .
  • the helical spring 20 is advantageously screwed into the holding element 21 with from one turn to three turns. A different number of turns of the helical spring 20 fixed to the holding element 21 can also be advantageous.
  • the first end 24 is held on a holding section 43 of the holding element 21 .
  • the holding section 43 has a helical groove 46 on its outer circumference for receiving the coil spring 20 .
  • a guide section 44 of the holding element 21 adjoins the holding section 43 .
  • the turns of the helical spring 20 are at a distance c from the retaining element 21 , measured perpendicularly to the longitudinal center axis 23 .
  • the guide section 44 the windings of the helical spring 20 are therefore not in contact with the holding element 21 in the unloaded state.
  • the guide section 44 is located inside the helical spring 20.
  • the guide section 44 has no groove 46.
  • the Guide section 44 has a groove, to which the coil spring 20 in the unloaded state has a distance in at least one direction, ie in the radial and/or axial direction, to adjust the spring stiffness.
  • the holding element 21 has an end face 31 arranged in an interior space 34 of the helical spring 20 .
  • the interior space 34 is the interior of the coil spring 20 that is enclosed by the coil spring 20 and does not denote a space that is closed off from the outside.
  • the end face 31 of the holding element 21 is formed on the guide section 44 .
  • a first centering element 35 is arranged on the end face 31 of the holding element 21 .
  • a second centering element 36 is arranged on the end face 32 of the second holding element 22 .
  • the first centering element 35 is designed as a cone protruding toward the second holding element 22 .
  • the cone has a cone angle ⁇ .
  • the cone angle ⁇ is the angle that the end face 31 encloses with the longitudinal center axis 23 in a section through the longitudinal center axis 23 .
  • the cone angle ⁇ is smaller than the angle ⁇ , which the longitudinal center axis 23 encloses with the parking surface 19 in the parking position 18 ( 1 ).
  • the angle ⁇ to a line 19 ′ is drawn in, which runs parallel to the shelf 19 .
  • the cone angle ⁇ is preferably at least 5° smaller than the angle of inclination ⁇ .
  • the cone angle ⁇ is advantageously 50° to 75°.
  • the centering element 35 encloses a centering angle ⁇ with the line 19'.
  • the centering angle ⁇ is the smallest angle that the centering element 35 encloses with the shelf 19 .
  • the centering angle ⁇ causes a force that centers the holding elements 21 and 22 with respect to the longitudinal center axis 23 .
  • the second holding element 22 also has a holding section 43 with a circumferential groove which is screwed into the coil spring 20 .
  • a guide section 44 adjoins the holding section 43 .
  • the holding element 22 has a an interior 34 of the coil spring 20 arranged end face 32 on.
  • a centering element 36 is formed on the end face 32 .
  • the centering element 36 is preferably designed to complement the centering element 35 and interacts with it to center the holding elements 21 and 22 when the distance between the holding elements 21 and 22 is correspondingly small.
  • the centering element 36 is designed as a conical depression.
  • a tear-off safety device 30 protrudes through the interior space 34 of the coil spring 20.
  • the tear-off safety device 30 is preferably designed as a steel cable.
  • a different design of the tear-off safeguard 30 can also be provided. The ends of the tear-off fuse 30 are held on the holding elements 21 and 22 . If the helical spring 20 breaks, the motor unit 2 and the handle unit 3 are thereby connected to one another via the tear-off safeguard 30 .
  • the end faces 31 and 32 have a distance d to one another in the unloaded state.
  • the distance d is advantageously at most 30%, in particular at most 20% of the length b of the coil spring 20.
  • the distance d in the unloaded state is at most 3 cm, in particular at most 2 cm.
  • the unloaded state is the state of the working device 1 in which the working device 1 is standing on the parking surface 19 when the drive motor 10 is switched off and no external forces are acting on the working device 1 .
  • the end faces 31 and 32 act as a stop between the motor unit 2 and the handle unit 3, for example under high loads.
  • the distance b is smaller than the difference between the length b of the helical spring 20 in the unloaded state and the block length of the helical spring 20. As a result, the end faces 31 and 32 come into contact with each other and act as a stop.
  • the holding section 43 and the guide section 44 of each holding element 21, 22 have a common length e.
  • the common length e is measured parallel to the longitudinal center axis 23 of the helical spring 20 .
  • the common length e corresponds to the length over which the holding element 21, 22 in the interior 34 of the coil spring 20 protrudes.
  • the common length e is advantageously at least 30%, in particular at least 35%, of the length b of the coil spring 20 for at least one holding element 21 or 22, in particular for both holding elements 21 and 22.
  • the holding elements 21 and 22 move towards one another until the end faces 31 and 32 of the holding elements 21 and 22 come into contact with one another.
  • the centering elements 35 and 36 center the holding elements 21 and 22 in relation to one another and to the longitudinal central axis 23.
  • the breakaway protection 30 includes a safety cable 37, in particular a steel cable.
  • the safety rope 37 is preferably a shear-resistant rope.
  • the safety cable 37 carries nipples 38 which have an outer diameter which is larger than that of the safety cable 37 .
  • the nipples 38 are arranged in receptacles 41 of the holding elements 21 and 22 .
  • a through-opening 40 leads from the receptacles 41 to the end faces 31 and 32.
  • the inner diameter of the through-opening is dimensioned such that the associated nipple 38 cannot pass through the through-opening 40.
  • the safety cable 37 thus limits the maximum distance between the holding elements 21 and 22 in the event of a breakage of the helical spring 20.
  • an enlarged section 45 is provided in each case.
  • the inner diameter of the through-opening 40 increases in the direction of the end face 31, 32 of the holding element 21 or 22, in which the through-opening 40 is arranged.
  • the extended section 45 can also advantageously be designed as a conical recess.
  • the angle ⁇ between the wall of the enlarged section 45 and the longitudinal central axis 23, which is 6 is drawn in can be, for example, 5° to 20°.
  • the passage opening 40 such as 7 shows, via a slot 39 with the periphery of the support member 21 and 22 respectively.
  • the slot 39 connects the passage opening 40 with the outer circumference in the guide section 44.
  • Each holding element 21, 22 has at least one fastening opening 47 for fastening to adjacent components.
  • a fastening screw for example, can protrude through the fastening openings 47 and fixes the holding element 21 to the motor unit 2 and the holding element 22 to the handle unit 3 , for example in the region of a fuel tank 15 .
  • the holding elements 21 and 22 are preferably made of plastic.
  • the coil spring 20 is advantageously a steel spring.
  • the fact that the centering elements 35, 36 can come into contact with one another means that the centering elements 35 and 36 can come into contact with a movement of the handle 7 provided for operation.
  • the holding elements 21 and 22 can advantageously consist of at least two different materials.
  • the holding elements 21 and 22 can advantageously be produced in two-component injection molding.
  • the holding elements 21 and 22 are advantageously formed from a soft component in the area of the end faces 31 and 32 .
  • the centering elements 35 and 36 are in particular made of an elastic material, preferably an elastomer.
  • the holding section 43 advantageously consists of a dimensionally stable plastic.
  • radial and axial consistently refer to the radial direction of the longitudinal center axis of the helical spring, ie perpendicular to the longitudinal center axis of the helical spring, and to the direction parallel to the longitudinal center axis of the helical spring.
EP21203947.3A 2021-10-21 2021-10-21 Appareil de travail guidé à la main Pending EP4169669A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP21203947.3A EP4169669A1 (fr) 2021-10-21 2021-10-21 Appareil de travail guidé à la main
US17/970,177 US20230128835A1 (en) 2021-10-21 2022-10-20 Handheld work apparatus
CN202211292401.XA CN116000373A (zh) 2021-10-21 2022-10-21 手持式工作器具

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP21203947.3A EP4169669A1 (fr) 2021-10-21 2021-10-21 Appareil de travail guidé à la main

Publications (1)

Publication Number Publication Date
EP4169669A1 true EP4169669A1 (fr) 2023-04-26

Family

ID=78371826

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21203947.3A Pending EP4169669A1 (fr) 2021-10-21 2021-10-21 Appareil de travail guidé à la main

Country Status (3)

Country Link
US (1) US20230128835A1 (fr)
EP (1) EP4169669A1 (fr)
CN (1) CN116000373A (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE469824B (sv) * 1989-10-27 1993-09-27 Electrolux Ab Motorsågsunderrede
DE10105826A1 (de) * 2001-02-07 2002-08-08 Stihl Maschf Andreas Schwingungsdämpfer zwischen zwei Bauteilen
DE102010011986A1 (de) 2010-03-19 2011-09-22 Andreas Stihl Ag & Co. Kg Handgeführtes Arbeitsgerät
EP2436263A2 (fr) * 2010-09-29 2012-04-04 Hitachi Koki Co., Ltd. Machine de travail portable
DE102013012513A1 (de) * 2013-07-27 2015-01-29 Andreas Stihl Ag & Co. Kg "Handgeführtes Arbeitsgerät"
DE102013012511A1 (de) * 2013-07-27 2015-01-29 Andreas Stihl Ag & Co. Kg "Handgeführtes Arbeitsgerät"

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10106915C2 (de) * 2001-02-15 2003-02-13 Benteler Automobiltechnik Gmbh Federungsanordnung
DE10332637A1 (de) * 2003-07-18 2005-02-03 Andreas Stihl Ag & Co. Kg Antivibrationselement

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE469824B (sv) * 1989-10-27 1993-09-27 Electrolux Ab Motorsågsunderrede
DE10105826A1 (de) * 2001-02-07 2002-08-08 Stihl Maschf Andreas Schwingungsdämpfer zwischen zwei Bauteilen
DE102010011986A1 (de) 2010-03-19 2011-09-22 Andreas Stihl Ag & Co. Kg Handgeführtes Arbeitsgerät
EP2436263A2 (fr) * 2010-09-29 2012-04-04 Hitachi Koki Co., Ltd. Machine de travail portable
DE102013012513A1 (de) * 2013-07-27 2015-01-29 Andreas Stihl Ag & Co. Kg "Handgeführtes Arbeitsgerät"
DE102013012511A1 (de) * 2013-07-27 2015-01-29 Andreas Stihl Ag & Co. Kg "Handgeführtes Arbeitsgerät"

Also Published As

Publication number Publication date
US20230128835A1 (en) 2023-04-27
CN116000373A (zh) 2023-04-25

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