EP3197651B1 - Work device - Google Patents

Work device Download PDF

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Publication number
EP3197651B1
EP3197651B1 EP15766398.0A EP15766398A EP3197651B1 EP 3197651 B1 EP3197651 B1 EP 3197651B1 EP 15766398 A EP15766398 A EP 15766398A EP 3197651 B1 EP3197651 B1 EP 3197651B1
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EP
European Patent Office
Prior art keywords
adjustment member
work apparatus
axis
rotation
tensioning
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.)
Active
Application number
EP15766398.0A
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German (de)
French (fr)
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EP3197651A1 (en
Inventor
Benjamin FREY
Helmut Zimmermann
Klaus-Martin Uhl
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
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Publication of EP3197651A1 publication Critical patent/EP3197651A1/en
Application granted granted Critical
Publication of EP3197651B1 publication Critical patent/EP3197651B1/en
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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
    • B27B17/14—Arrangements for stretching the chain saw
    • 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
    • B27B17/02—Chain saws equipped with guide bar

Definitions

  • the invention relates to an implement of the type specified in the preamble of claim 1.
  • a chainsaw is known with a saw chain which is driven to rotate on a guide rail and which can be tensioned via a tensioning device.
  • the tensioning device comprises a rotatably mounted adjusting screw with a screw head and a screw shaft.
  • the screw shaft acts via a threaded connection on a tendon attached to the guide rail.
  • a rotation of the adjusting screw causes a longitudinal displacement of the guide bar via the threaded connection, so that the saw chain is tensioned.
  • the operator has to apply a large amount of torque to the screw head. Due to the small diameter of the screw shaft, the transferable clamping forces are limited.
  • a chainsaw is known with a saw chain which is driven to rotate on a guide rail and which can be tensioned via a tensioning device.
  • the tensioning device comprises an adjusting screw mounted in the housing of the chainsaw and a clamping means screwed onto the adjusting screw.
  • the clamping means is firmly connected to the guide rail in the longitudinal direction of the guide rail.
  • the invention is based on the object of creating an implement of the generic type which has a simple structure and enables the transmission of comparatively high clamping forces.
  • the greatest distance between the threaded section of the adjusting element and the axis of rotation is at least as great as the greatest distance between the actuation contour and the axis of rotation. Due to the comparatively large outer circumference of the threaded section compared to the outer circumference of the actuating contour, large forces can be transmitted from the adjusting element to the tensioning element. At the same time, the structure is simple, since no additional components are required for the transmission of comparatively high forces.
  • the at least one depression in the actuating contour of the adjusting element advantageously interrupts the at least one thread turn of the adjusting element at least partially.
  • the actuating contour advantageously extends over a length section of the adjusting element, and the thread of the adjusting element extends over the entire length of this length section.
  • the overlapping of the actuating contour and the threaded section in the length section of the adjusting element makes it possible to achieve a short overall length of the adjusting element. This results in a compact design of the adjusting member with a short length. Due to the compact design of the adjusting element, the adjusting element is light, so that there is a weight saving of the implement.
  • the adjusting member preferably has a base body with a cylindrical outer surface, and the actuating contour and the threaded section each extend over the entire axial length of the base body of the adjusting member.
  • the adjusting member is very compact, and yet the actuating contour and the threaded section are designed to be as large as possible.
  • the actuating contour is expediently formed by at least one, preferably by at least three, in particular by at least four grooves.
  • the longitudinal direction of the at least one groove of the actuating contour expediently runs at an angle of at most approximately 40 ° with respect to the axis of rotation of the adjusting member.
  • the longitudinal direction of the at least one groove of the actuating contour runs parallel to the axis of rotation of the adjusting member.
  • the flanks of the groove expediently enclose an angle in a sectional plane perpendicular to the axis of rotation of the adjusting member which is from approximately 60 ° to approximately 120 °, in particular from approximately 70 ° to approximately 110 °.
  • the large angle allows a large opening on the circumference of the adjusting member so that the operator can easily grip between the flanks and rotate the adjusting member.
  • the implement advantageously comprises a sprocket cover on which the adjusting member is rotatably mounted, the adjusting member being supported on the sprocket cover in the direction of the axis of rotation.
  • the adjusting member is held in the sprocket cover, and the sprocket cover can be easily assembled together with the adjusting member. Because the adjusting member is mounted on the sprocket cover and not directly on the housing, the clamping force is diverted into the housing via the sprocket cover.
  • the sprocket cover has an opening through which the main body of the adjusting member protrudes at least partially to the outside of the sprocket cover.
  • the sprocket cover advantageously has a recessed grip on at least one side of the opening that runs parallel to the axis of rotation of the adjusting member. As a result, the adjusting member is easily accessible to an operator.
  • the opening can also allow dirt that is in the Clamping device has deposited, for example sawdust, emerge. The dirt is conveyed through the opening when the adjusting member is turned.
  • the adjusting member expediently has bearing journals on its end faces, which are held in receptacles in the sprocket cover.
  • the bearing journals are expediently clipped into receptacles in the sprocket cover.
  • the bearing journals can also be held in a bearing shell formed on a bearing cover, the bearing cover being attached to the sprocket cover.
  • the implement advantageously has an actuating element for fixing the sprocket cover on the housing of the implement, which is arranged adjacent to the tensioning device on the sprocket cover.
  • an operator can, for example, tension the chain, in particular the saw chain, with one hand by turning the adjusting member and, after reaching the desired saw chain tension, fix the sprocket cover on the housing of the implement with the other hand by adjusting the actuating element.
  • the clamping member is preferably designed in the form of a disk and carries the threaded section on a flat side, the threaded section being formed by subsections of adjacent threads.
  • the flat side carrying the threaded section advantageously has a step running transversely to the longitudinal center axis of the guide rail, the thickness of the tensioning member being reduced on the side of the step facing the fastening element.
  • the clamping member can be pushed into the area of the fastening element, so that a large clamping path of the clamping device results with a small overall width of the saw.
  • the working device has a compact and narrow design, particularly in the transverse direction, that is to say in the direction of the axis of rotation of the drive shaft.
  • the actuating element can be made comparatively large, so that an operator can actuate the actuating element easily and conveniently.
  • the outer diameter of the adjusting member is expediently at least 15 mm, in particular at least 20 mm. Due to the comparatively large outer diameter, a large force can be transmitted from the adjusting member to the clamping member via the threaded sections. The adjusting member can apply high clamping forces even with low strength. Furthermore, due to the comparatively large outer diameter of the adjusting element, a large thread diameter is made possible, whereby due to the large thread diameter, the stress on the thread flanks is lower compared to an adjusting element with a smaller outer diameter and smaller thread diameter with the same load, so that the threaded section of the adjusting element can be made of plastic, for example.
  • the clamping member advantageously has at least one pin which engages in an opening in the guide rail and thereby connects the clamping member to the guide rail in a form-fitting manner in the direction of the longitudinal center axis of the guide rail.
  • the threads of the threaded connection are expediently trapezoidal threads, the flank angles of the trapezoidal threads being from 0 ° to 60 °.
  • the threaded section of the adjusting element and the threaded section of the clamping element are advantageously made of plastic, in particular of fiber-reinforced plastic.
  • the weight of the adjusting member and the weight of the tensioning member are comparatively low, so that the total weight of the implement is reduced.
  • the adjusting element and the tensioning element are expediently made entirely of plastic, in particular of fiber-reinforced plastic.
  • the implement is expediently a chainsaw. It can also be useful that the implement is a stone cutter.
  • Fig. 1 shows a motor saw 1 as an exemplary embodiment of a working device.
  • the motor saw 1 comprises a housing 6 in which a drive motor 52, for example an internal combustion engine or an electric motor, is arranged. Is the drive motor 52 as Designed as an electric motor, the electric motor can draw its energy from a battery (not shown).
  • the drive motor 52 drives a chain 5 via a drive shaft 2 and a drive pinion 3.
  • the chain 5 is designed as a saw chain.
  • a sprocket cover 10 is fixed to the housing 6 in the area of the drive pinion 3.
  • the chainsaw 1 comprises a guide rail 4. In operation, the chain 5 revolves on the guide rail 4.
  • handles namely a rear handle 7 and a handle tube 8, are fixed on the housing 6.
  • the chainsaw 1 has an in Fig. 2
  • the tensioning device 15 comprises a tensioning element 16 and an adjusting element 17.
  • the guide rail 4 is moved relative to the housing 6 in the direction of a longitudinal center axis 18 ( Fig. 1 ) the guide rail 4 moves.
  • the clamping member 16 engages positively in two circular openings 14 arranged on the guide rail 4, so that forces can be transmitted from the clamping member 16 to the guide rail 4, in particular in the direction of the longitudinal center axis 18 of the guide rail 4.
  • the guide rail 4 has a longitudinal slot 13.
  • a bolt 9 is fixed on the housing 6 and engages in the longitudinal slot 13.
  • the longitudinal slot 13 enables the movement of the guide rail 4 in the direction of the longitudinal center axis 18 of the guide rail 4.
  • An actuating element 11, which comprises a nut 12, can be screwed onto the bolt 9.
  • the sprocket cover 10 covers the tensioning device 15 and the drive pinion 3.
  • the sprocket cover 10 is via the actuating element 11 screwed onto the bolt 9 on the in Fig. 3 housing 6 shown schematically held.
  • the guide rail 4 is held clamped between the sprocket cover 10 and the housing 6 by the actuating element 11.
  • the adjusting member 17 is mounted in the sprocket cover 10 so as to be rotatable about an axis of rotation 21.
  • the adjusting member 17 is connected to the clamping member 16 via a threaded connection 20. Due to the threaded connection 20, a rotation of the adjusting member 17 about its axis of rotation 21 causes the clamping member 16 to move in the direction of the longitudinal center axis 18 of the guide rail 4.
  • the adjusting member 17 has a threaded section 22 with four threads 23 on its outer circumference.
  • the clamping member 16 has a threaded section 24.
  • the threaded portion 22 of the adjusting member 17 is provided for engagement in the threaded portion 24 of the clamping member 16, whereby the threaded connection 20 is formed.
  • the actuating element 11 is tightened onto the bolt 9 with the nut 12 injected into the actuating element 11. As a result, the guide rail 4 is clamped between the bolt 9 and nut 12.
  • the sprocket cover 10 has one in the Fig. 5 and 8th Opening 25 shown. That in the Figures 4 and 5
  • the adjusting member 17 shown protrudes at least partially through the opening 25 to an outside 26 of the sprocket cover 10, so that an operator can rotate the adjusting member 17 from the outside. So that the operator can easily rotate the adjusting member 17, the sprocket cover 10 has a recessed grip 28 which extends on the sides 27 of the opening 25 running parallel to the axis of rotation 21 of the adjusting member 17.
  • an elevation 29 formed in one piece with the sprocket cover 10 is provided on the sprocket cover 10, in the area of the opening 25, an elevation 29 formed in one piece with the sprocket cover 10 is provided.
  • the elevation 29 arches towards the outside 26 of the sprocket cover 10 and ends approximately flush with the adjusting member 17 in the area of the adjusting member 17.
  • the elevation 29 and the adjusting member 17 are at least partially in one plane.
  • the clamping member 16 has two pins 30. When installed, the pins 30 engage in the openings 14 of the guide rail 4 ( Fig. 2 ) and thereby connect the tendon 16 in the direction of the longitudinal center axis 18 ( Fig. 1 ) of the guide rail 4 in a form-fitting manner with the guide rail 4.
  • Guide elements 31 are provided on the clamping member 16. When the guide rail 4 is mounted, the hook-shaped guide elements 31 protrude into the longitudinal slot 13 of the guide rail 4 ( Fig. 2 ) and rest on the side of the guide rail 4 facing the drive pinion 3 on the guide rail 4.
  • a wall 33 is arranged on an inner side 32 of the sprocket cover 10.
  • the wall 33 delimits a channel in which the saw chain ( Fig. 1 ) runs to the outside. This largely prevents sawdust from getting stuck in the sprocket cover 7.
  • receptacles 34 for the rotatable mounting of the adjusting member 17 ( Fig. 3 ) intended.
  • Each of the receptacles 34 is approximately semicircular.
  • locking lugs 36 are provided on the receptacles 34 so that the cylindrical bearing journals 35 of the adjusting member 17 ( Fig. 3 ) can be clipped into the receptacles 34 of the sprocket cover 10.
  • a bearing cover which has receptacles 34 for the latching lugs 36 and which is fastened to the sprocket cover 10, for example screwed onto the sprocket cover 10, can also be provided.
  • the adjusting member 17 has an actuating contour 39.
  • An operator can rotate the adjusting member 17 on the actuating contour 39.
  • the actuating contour 39 comprises four depressions which interrupt the threads 23.
  • the depressions are designed as grooves 41.
  • Each of the grooves 41 is formed by two flanks 42 ( Figures 12 and 13 ) limited.
  • the flanks 42 of the grooves 41 each enclose an angle ⁇ , which in the exemplary embodiment is approximately 90 °.
  • the angle ⁇ is advantageously in a range from approximately 60 ° to approximately 120 °, in particular from approximately 70 ° to approximately 110 °.
  • the longitudinal direction of the groove 41 runs parallel to the axis of rotation 21 ( Fig. 10 ).
  • the longitudinal direction of the at least one groove 41 in a side view of the adjusting member 17 can run at an angle with respect to the axis of rotation 21 of the adjusting member 17, the angle advantageously being at most 40 °.
  • the adjusting member 17 has a base body 44 with a cylindrical outer surface 45, the cylindrical outer surface 45 being interrupted by the grooves 41 and the threads 23.
  • the actuating contour 39 extends over the entire axial length of the cylindrical base body 44 of the adjusting member 17.
  • the threaded section 22 of the adjusting member 17 also extends over the entire axial length of the base body 44 of the adjusting member 17.
  • the Grooves 41 and the threads 23 extend only over a portion of the axial length of the base body 44 and advantageously only partially overlap in the axial direction.
  • the actuation contour 39 has a greatest distance a to the axis of rotation 21, which in the exemplary embodiment is exactly as great as the greatest distance b of the outer circumference of the threaded section 22 of the adjusting member 17 to the axis of rotation 21.
  • the outer circumference of the threaded section 22 of the adjusting member 17 is advantageously at least 15 mm, in particular at least 20 mm.
  • the thread of the threaded section 22 is designed as a trapezoidal thread 46, the flank angle ⁇ of which is at most 60 °.
  • the thread of the threaded section 24 of the tendon 16 is also designed as a trapezoidal thread 47, the flank angle ⁇ ( Fig. 14 ) is at most 60 °.
  • the threaded section 22 of the adjusting member 17 ( Figures 10 to 13 ) and the threaded section 24 of the tendon 16 ( Figures 14 to 16 ) are made of plastic, especially fiber-reinforced plastic.
  • the adjusting member 17 and the clamping member 16 are made entirely of plastic.
  • the adjusting member 17 has a central bore 37.
  • the axis of the central bore 37 corresponds to the axis of rotation 21.
  • the central bore 37 penetrates the adjusting member 17 completely and serves as a weight reduction bore.
  • several, namely four, channels 38 are formed, offset radially outward, which run parallel to the central bore 37 and completely penetrate the adjusting member 17.
  • the channels 38 are also provided for weight reduction.
  • the clamping member 16 is flat. On a flat side 48, the clamping member 16 carries the threaded section 24. The threaded section 24 is not formed by complete threads, but by subsections of adjacent threads.
  • the tension member 16 has on its flat side 48 a transverse to the longitudinal center axis 18 of the guide rail 4 ( Fig. 3 ) and step 51 running transversely to the plane of the guide rail 4.
  • the thickness d of the tendon 16 in a first portion 49 of the tendon 16 is smaller than the thickness e of the tendon 16 in a second portion 50 of the tendon 16.
  • the thicknesses d and e are measured perpendicular to the plane of the guide rail 4.
  • the sub-sections of the thread turns of the thread section 24 in the first sub-area 49 are thus flatter sections of a complete thread turn than that Sub-sections of the threads in the second sub-area 50.
  • the sub-area 49 with reduced thickness d is the actuating element 11 ( Fig. 2 ) facing arranged like Fig. 3 shows.
  • the clamping member 16 On the side facing away from the flat side 48, the clamping member 16 carries the pins 30 and the guide elements 31. How Fig. 17 shows, openings 40 are formed in sub-area 49 between adjacent threads. As a result, a very small thickness d can be achieved. At the same time, when the adjusting member 17 is rotated, dirt can be conveyed out of the threads of the clamping member 16.
  • the clamping member 16 is a separate component. However, it can also be expedient for the clamping member 16 to be designed as part of the guide rail 4.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Sawing (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Description

Die Erfindung betrifft ein Arbeitsgerät der im Oberbegriff des Anspruchs 1 angegebenen Gattung.The invention relates to an implement of the type specified in the preamble of claim 1.

Aus der WO 2005/108030 A1 ist eine Motorsäge mit einer an einer Führungsschiene umlaufend angetriebenen Sägekette bekannt, die über eine Spannvorrichtung gespannt werden kann. Die Spannvorrichtung umfasst eine drehbar gelagerte Verstellschraube mit einem Schraubenkopf und einem Schraubenschaft. Der Schraubenschaft wirkt über eine Gewindeverbindung auf ein an der Führungsschiene festgelegtes Spannglied. Eine Drehung der Verstellschraube bewirkt über die Gewindeverbindung eine Längsverschiebung der Führungsschiene, so dass die Sägekette gespannt wird. Damit die Sägekette gespannt werden kann, muss der Bediener ein großes Drehmoment auf den Schraubenkopf aufbringen. Aufgrund des geringen Durchmessers des Schraubenschafts sind die übertragbaren Spannkräfte begrenzt.From the WO 2005/108030 A1 a chainsaw is known with a saw chain which is driven to rotate on a guide rail and which can be tensioned via a tensioning device. The tensioning device comprises a rotatably mounted adjusting screw with a screw head and a screw shaft. The screw shaft acts via a threaded connection on a tendon attached to the guide rail. A rotation of the adjusting screw causes a longitudinal displacement of the guide bar via the threaded connection, so that the saw chain is tensioned. In order for the saw chain to be tensioned, the operator has to apply a large amount of torque to the screw head. Due to the small diameter of the screw shaft, the transferable clamping forces are limited.

Aus der JP 2002-36203 A ist eine Motorsäge mit einer an einer Führungsschiene umlaufend angetriebenen Sägekette bekannt, die über eine Spannvorrichtung gespannt werden kann. Die Spannvorrichtung umfasst eine im Gehäuse der Motorsäge gelagerte Stellschraube und ein auf der Stellschraube aufgeschraubtes Spannmittel. Das Spannmittel ist mit der Führungsschiene in Längsrichtung der Führungsschiene fest verbunden. Durch Drehung der Stellschraube mit einem Schraubendreher wird das Spannmittel mit der Führungsschiene in Längsrichtung der Führungsschiene verschoben, so dass die Sägekette gespannt wird.From the JP 2002-36203 A a chainsaw is known with a saw chain which is driven to rotate on a guide rail and which can be tensioned via a tensioning device. The tensioning device comprises an adjusting screw mounted in the housing of the chainsaw and a clamping means screwed onto the adjusting screw. The clamping means is firmly connected to the guide rail in the longitudinal direction of the guide rail. By turning the adjusting screw with a screwdriver, the tensioning means with the guide bar is moved in the longitudinal direction of the guide bar, so that the saw chain is tensioned.

Der Erfindung liegt die Aufgabe zugrunde, ein Arbeitsgerät der gattungsgemäßen Art zu schaffen, das einen einfachen Aufbau besitzt und die Übertragung vergleichsweise hoher Spannkräfte ermöglicht.The invention is based on the object of creating an implement of the generic type which has a simple structure and enables the transmission of comparatively high clamping forces.

Diese Aufgabe wird mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved with the features of claim 1.

Es ist vorgesehen, dass der größte Abstand des Gewindeabschnitts des Verstellglieds zur Drehachse mindestens so groß ist wie der größte Abstand der Betätigungskontur zur Drehachse. Durch den vergleichsweise großen Außenumfang des Gewindeabschnitts gegenüber dem Außenumfang der Betätigungskontur können große Kräfte vom Verstellglied auf das Spannglied übertragen werden. Gleichzeitig ergibt sich ein einfacher Aufbau, da für die Übertragung vergleichsweise hoher Kräfte keine zusätzlichen Bauteile benötigt werden.It is provided that the greatest distance between the threaded section of the adjusting element and the axis of rotation is at least as great as the greatest distance between the actuation contour and the axis of rotation. Due to the comparatively large outer circumference of the threaded section compared to the outer circumference of the actuating contour, large forces can be transmitted from the adjusting element to the tensioning element. At the same time, the structure is simple, since no additional components are required for the transmission of comparatively high forces.

Vorteilhaft unterbricht die mindestens eine Vertiefung der Betätigungskontur des Verstellglieds den mindestens einen Gewindegang des Verstellglieds mindestens teilweise. Die Vertiefung und der Gewindegang überlappen sich demnach mindestens teilweise. Vorteilhaft erstreckt sich die Betätigungskontur über einen Längenabschnitt des Verstellglieds, und der Gewindegang des Verstellglieds erstreckt sich über die gesamte Länge dieses Längenabschnitts. Durch die Überlappung von Betätigungskontur und Gewindeabschnitt in dem Längenabschnitt des Verstellglieds kann eine geringe Baulänge des Verstellglieds erreicht werden. Dadurch ergibt sich eine kompakte Bauweise des Verstellglieds mit geringer Länge. Durch die kompakte Bauweise des Verstellglieds ist das Verstellglied leicht, so dass sich eine Gewichtsersparnis des Arbeitsgeräts ergibt.The at least one depression in the actuating contour of the adjusting element advantageously interrupts the at least one thread turn of the adjusting element at least partially. The depression and the thread turn accordingly at least partially overlap. The actuating contour advantageously extends over a length section of the adjusting element, and the thread of the adjusting element extends over the entire length of this length section. The overlapping of the actuating contour and the threaded section in the length section of the adjusting element makes it possible to achieve a short overall length of the adjusting element. This results in a compact design of the adjusting member with a short length. Due to the compact design of the adjusting element, the adjusting element is light, so that there is a weight saving of the implement.

Vorzugsweise besitzt das Verstellglied einen Grundkörper mit einer zylindrischen Außenfläche, und die Betätigungskontur und der Gewindeabschnitt erstrecken sich jeweils über die gesamte axiale Länge des Grundkörpers des Verstellglieds. Dadurch ist das Verstellglied sehr kompakt aufgebaut, und dennoch sind die Betätigungskontur und der Gewindeabschnitt möglichst groß ausgebildet.The adjusting member preferably has a base body with a cylindrical outer surface, and the actuating contour and the threaded section each extend over the entire axial length of the base body of the adjusting member. As a result, the adjusting member is very compact, and yet the actuating contour and the threaded section are designed to be as large as possible.

Zweckmäßig ist die Betätigungskontur durch mindestens eine, vorzugsweise durch mindestens drei, insbesondere durch mindestens vier Nuten gebildet. Zweckmäßig verläuft die Längsrichtung der mindestens einen Nut der Betätigungskontur unter einem Winkel von höchstens etwa 40° gegenüber der Drehachse des Verstellglieds. Insbesondere verläuft die Längsrichtung der mindestens einen Nut der Betätigungskontur parallel zur Drehachse des Verstellglieds. Zweckmäßig schließen die Flanken der Nut in einer Schnittebene senkrecht zur Drehachse des Verstellglieds einen Winkel ein, der von etwa 60° bis etwa 120°, insbesondere von etwa 70° bis etwa 110° beträgt. Der große Winkel ermöglicht eine große Öffnung am Umfang des Verstellglieds, so dass der Bediener gut zwischen die Flanken greifen und das Verstellglied drehen kann.The actuating contour is expediently formed by at least one, preferably by at least three, in particular by at least four grooves. The longitudinal direction of the at least one groove of the actuating contour expediently runs at an angle of at most approximately 40 ° with respect to the axis of rotation of the adjusting member. In particular, the longitudinal direction of the at least one groove of the actuating contour runs parallel to the axis of rotation of the adjusting member. The flanks of the groove expediently enclose an angle in a sectional plane perpendicular to the axis of rotation of the adjusting member which is from approximately 60 ° to approximately 120 °, in particular from approximately 70 ° to approximately 110 °. The large angle allows a large opening on the circumference of the adjusting member so that the operator can easily grip between the flanks and rotate the adjusting member.

Vorteilhaft umfasst das Arbeitsgerät einen Kettenraddeckel, an dem das Verstellglied drehbar gelagert ist, wobei sich das Verstellglied in Richtung der Drehachse an dem Kettenraddeckel abstützt. Dadurch ist das Verstellglied im Kettenraddeckel gehalten, und der Kettenraddeckel lässt sich zusammen mit dem Verstellglied einfach montieren. Dadurch, dass das Verstellglied am Kettenraddeckel und nicht unmittelbar am Gehäuse gelagert ist, wird die Spannkraft über den Kettenraddeckel ins Gehäuse abgeleitet.The implement advantageously comprises a sprocket cover on which the adjusting member is rotatably mounted, the adjusting member being supported on the sprocket cover in the direction of the axis of rotation. As a result, the adjusting member is held in the sprocket cover, and the sprocket cover can be easily assembled together with the adjusting member. Because the adjusting member is mounted on the sprocket cover and not directly on the housing, the clamping force is diverted into the housing via the sprocket cover.

Der Kettenraddeckel weist eine Öffnung auf, durch die der Grundkörper des Verstellglieds mindestens teilweise zur Außenseite des Kettenraddeckels ragt. Der Kettenraddeckel weist vorteilhaft an mindestens einer parallel zur Drehachse des Verstellglieds verlaufenden Seite der Öffnung eine Griffmulde auf. Dadurch ist das Verstellglied für einen Bediener gut zugänglich. Durch die Öffnung kann zudem Schmutz, der sich in der Spannvorrichtung abgelagert hat, beispielsweise Sägespäne, austreten. Der Schmutz wird dabei beim Drehen des Verstellglieds durch die Öffnung gefördert.The sprocket cover has an opening through which the main body of the adjusting member protrudes at least partially to the outside of the sprocket cover. The sprocket cover advantageously has a recessed grip on at least one side of the opening that runs parallel to the axis of rotation of the adjusting member. As a result, the adjusting member is easily accessible to an operator. The opening can also allow dirt that is in the Clamping device has deposited, for example sawdust, emerge. The dirt is conveyed through the opening when the adjusting member is turned.

Zweckmäßig weist das Verstellglied an seinen Stirnseiten Lagerzapfen auf, die in Aufnahmen des Kettenraddeckels gehalten sind. Zweckmäßig sind die Lagerzapfen in Aufnahmen des Kettenraddeckels eingeklipst. Die Lagerzapfen können auch in einer an einer Lagerabdeckung ausgebildeten Lagerschale gehalten sein, wobei die Lagerabdeckung am Kettenraddeckel befestigt ist.The adjusting member expediently has bearing journals on its end faces, which are held in receptacles in the sprocket cover. The bearing journals are expediently clipped into receptacles in the sprocket cover. The bearing journals can also be held in a bearing shell formed on a bearing cover, the bearing cover being attached to the sprocket cover.

Vorteilhaft weist das Arbeitsgerät ein Betätigungselement zur Fixierung des Kettenraddeckels an dem Gehäuse des Arbeitsgeräts auf, das benachbart zu der Spannvorrichtung am Kettenraddeckel angeordnet ist. Dadurch kann ein Bediener beispielsweise mit einer Hand durch Drehen des Verstellglieds die Kette, insbesondere Sägekette, spannen und nach Erreichen der gewünschten Sägekettenspannung den Kettenraddeckel am Gehäuse des Arbeitsgeräts mit der anderen Hand durch Verstellen des Betätigungselements fixieren.The implement advantageously has an actuating element for fixing the sprocket cover on the housing of the implement, which is arranged adjacent to the tensioning device on the sprocket cover. As a result, an operator can, for example, tension the chain, in particular the saw chain, with one hand by turning the adjusting member and, after reaching the desired saw chain tension, fix the sprocket cover on the housing of the implement with the other hand by adjusting the actuating element.

Vorzugsweise ist das Spannglied scheibenförmig ausgebildet und trägt an einer Flachseite den Gewindeabschnitt, wobei der Gewindeabschnitt durch Teilabschnitte von benachbarten Gewindegängen gebildet ist. Die den Gewindeabschnitt tragende Flachseite weist vorteilhaft eine quer zur Längsmittelachse der Führungsschiene verlaufende Stufe auf, wobei die Dicke des Spannglieds an der dem Befestigungselement zugewandten Seite der Stufe verringert ist. Dadurch kann das Spannglied bis in den Bereich des Befestigungselements geschoben werden, so dass sich ein großer Spannweg der Spannvorrichtung bei geringer Baubreite der Säge ergibt. Dadurch ist das Arbeitsgerät insbesondere in Querrichtung, also in Richtung der Drehachse der Antriebswelle, kompakt und schmal aufgebaut. Das Betätigungselement kann vergleichsweise groß ausgebildet sein, so dass ein Bediener das Betätigungselement einfach und bequem betätigen kann.The clamping member is preferably designed in the form of a disk and carries the threaded section on a flat side, the threaded section being formed by subsections of adjacent threads. The flat side carrying the threaded section advantageously has a step running transversely to the longitudinal center axis of the guide rail, the thickness of the tensioning member being reduced on the side of the step facing the fastening element. As a result, the clamping member can be pushed into the area of the fastening element, so that a large clamping path of the clamping device results with a small overall width of the saw. As a result, the working device has a compact and narrow design, particularly in the transverse direction, that is to say in the direction of the axis of rotation of the drive shaft. The actuating element can be made comparatively large, so that an operator can actuate the actuating element easily and conveniently.

Zweckmäßig beträgt der Außendurchmesser des Verstellglieds mindestens 15 mm, insbesondere mindestens 20 mm. Durch den vergleichsweise großen Außendurchmesser ist eine große Kraft vom Verstellglied über die Gewindeabschnitte auf das Spannglied übertragbar. Das Verstellglied kann auch bei geringer Festigkeit hohe Spannkräfte aufbringen. Weiterhin ist aufgrund des vergleichsweise großen Außendurchmessers des Verstellglieds ein großer Gewindedurchmesser ermöglicht, wobei aufgrund des großen Gewindedurchmessers die Beanspruchung der Gewindeflanken gegenüber einem Verstellglied mit kleinerem Außendurchmesser und kleinerem Gewindedurchmesser bei gleicher Belastung geringer ist, so dass der Gewindeabschnitt des Verstellglieds beispielsweise aus Kunststoff bestehen kann.The outer diameter of the adjusting member is expediently at least 15 mm, in particular at least 20 mm. Due to the comparatively large outer diameter, a large force can be transmitted from the adjusting member to the clamping member via the threaded sections. The adjusting member can apply high clamping forces even with low strength. Furthermore, due to the comparatively large outer diameter of the adjusting element, a large thread diameter is made possible, whereby due to the large thread diameter, the stress on the thread flanks is lower compared to an adjusting element with a smaller outer diameter and smaller thread diameter with the same load, so that the threaded section of the adjusting element can be made of plastic, for example.

Vorteilhaft weist das Spannglied mindestens einen Zapfen auf, der in eine Öffnung der Führungsschiene eingreift und dadurch das Spannglied in Richtung der Längsmittelachse der Führungsschiene formschlüssig mit der Führungsschiene verbindet. Zweckmäßig sind die Gewinde der Gewindeverbindung Trapezgewinde, wobei die Flankenwinkel der Trapezgewinde von 0° bis 60° betragen.The clamping member advantageously has at least one pin which engages in an opening in the guide rail and thereby connects the clamping member to the guide rail in a form-fitting manner in the direction of the longitudinal center axis of the guide rail. The threads of the threaded connection are expediently trapezoidal threads, the flank angles of the trapezoidal threads being from 0 ° to 60 °.

Vorteilhaft bestehen der Gewindeabschnitt des Verstellglieds und der Gewindeabschnitt des Spannglieds aus Kunststoff, insbesondere aus faserverstärktem Kunststoff. Dadurch sind das Gewicht des Verstellglieds und das Gewicht des Spannglieds vergleichsweise gering, so dass das Gesamtgewicht des Arbeitsgeräts verringert ist. Zweckmäßig bestehen das Verstellglied und das Spannglied vollständig aus Kunststoff, insbesondere aus faserverstärktem Kunststoff.The threaded section of the adjusting element and the threaded section of the clamping element are advantageously made of plastic, in particular of fiber-reinforced plastic. As a result, the weight of the adjusting member and the weight of the tensioning member are comparatively low, so that the total weight of the implement is reduced. The adjusting element and the tensioning element are expediently made entirely of plastic, in particular of fiber-reinforced plastic.

Zweckmäßig ist das Arbeitsgerät eine Motorsäge. Es kann auch zweckmäßig sein, dass das Arbeitsgerät ein Gesteinschneider ist.The implement is expediently a chainsaw. It can also be useful that the implement is a stone cutter.

Ein Ausführungsbeispiel der Erfindung wird im Folgenden anhand der Zeichnung erläutert. Es zeigen:

Fig. 1
eine schematische Darstellung eines Arbeitsgeräts,
Fig. 2
eine perspektivische Explosionsdarstellung von Betätigungselement, Kettenraddeckel, Spannvorrichtung und Führungsschiene des Arbeitsgeräts aus Fig. 1,
Fig. 3
eine schematische Schnittdarstellung durch den Kettenraddeckel, die Spannvorrichtung, das Betätigungselement und die Führungsschiene,
Fig. 4
eine perspektivische Ansicht des Kettenraddeckels mit Verstellglied und Betätigungselement,
Fig. 5
eine Seitenansicht des Kettenraddeckels, des Verstellglieds und des Betätigungselements,
Fig. 6
eine perspektivische Ansicht des Kettenraddeckels und des Spannglieds,
Fig. 7
eine Seitenansicht des Kettenraddeckels und des Spannglieds,
Fig. 8 und 9
perspektivische Ansichten des Kettenraddeckels,
Fig. 10
eine perspektivische Ansicht des Verstellglieds,
Fig. 11
eine Seitenansicht des Verstellglieds,
Fig. 12
eine Seitenansicht des Verstellglieds in Richtung des Pfeils XII in Fig. 11,
Fig. 13
eine Seitenansicht des Verstellglieds in Richtung des Pfeils XIII in Fig. 11,
Fig. 14 und 15
perspektivische Ansichten des Spannglieds,
Fig. 16 und 17
Seitenansichten des Spannglieds,
Fig. 18
eine Seitenansicht des Spannglieds in Richtung des Pfeils XVIII in Fig. 16,
Fig. 19
eine Seitenansicht des Spannglieds in Richtung des Pfeils XIX in Fig. 16.
An exemplary embodiment of the invention is explained below with reference to the drawing. Show it:
Fig. 1
a schematic representation of an implement,
Fig. 2
a perspective exploded view of the actuating element, sprocket cover, tensioning device and guide rail of the implement Fig. 1 ,
Fig. 3
a schematic sectional view through the sprocket cover, the tensioning device, the actuating element and the guide rail,
Fig. 4
a perspective view of the sprocket cover with adjusting member and actuating element,
Fig. 5
a side view of the sprocket cover, the adjusting member and the actuating element,
Fig. 6
a perspective view of the sprocket cover and the tension member,
Fig. 7
a side view of the sprocket cover and the tendon,
Figures 8 and 9
perspective views of the sprocket cover,
Fig. 10
a perspective view of the adjusting member,
Fig. 11
a side view of the adjusting member,
Fig. 12
a side view of the adjusting member in the direction of arrow XII in Fig. 11 ,
Fig. 13
a side view of the adjusting member in the direction of arrow XIII in Fig. 11 ,
Figures 14 and 15
perspective views of the tendon,
Figures 16 and 17
Side views of the tendon,
Fig. 18
a side view of the tendon in the direction of arrow XVIII in Fig. 16 ,
Fig. 19
a side view of the tendon in the direction of arrow XIX in Fig. 16 .

Fig. 1 zeigt als Ausführungsbeispiel für ein Arbeitsgerät eine Motorsäge 1. Die Motorsäge 1 umfasst ein Gehäuse 6, in dem ein Antriebsmotor 52, beispielsweise ein Verbrennungsmotor oder ein Elektromotor, angeordnet ist. Ist der Antriebsmotor 52 als Elektromotor ausgebildet, so kann der Elektromotor seine Energie über einen nicht gezeigten Akku beziehen. Der Antriebsmotor 52 treibt über eine Antriebswelle 2 und ein Antriebsritzel 3 eine Kette 5 an. Im Ausführungsbeispiel ist die Kette 5 als Sägekette ausgeführt. Im Bereich des Antriebsritzels 3 ist ein Kettenraddeckel 10 am Gehäuse 6 fixiert. Die Motorsäge 1 umfasst eine Führungsschiene 4. Im Betrieb läuft die Kette 5 an der Führungsschiene 4 um. Zum Führen der Motorsäge 1 sind an dem Gehäuse 6 Handgriffe, nämlich ein hinterer Handgriff 7 sowie ein Griffrohr 8, festgelegt. Fig. 1 shows a motor saw 1 as an exemplary embodiment of a working device. The motor saw 1 comprises a housing 6 in which a drive motor 52, for example an internal combustion engine or an electric motor, is arranged. Is the drive motor 52 as Designed as an electric motor, the electric motor can draw its energy from a battery (not shown). The drive motor 52 drives a chain 5 via a drive shaft 2 and a drive pinion 3. In the exemplary embodiment, the chain 5 is designed as a saw chain. A sprocket cover 10 is fixed to the housing 6 in the area of the drive pinion 3. The chainsaw 1 comprises a guide rail 4. In operation, the chain 5 revolves on the guide rail 4. To guide the chainsaw 1, handles, namely a rear handle 7 and a handle tube 8, are fixed on the housing 6.

Die Motorsäge 1 besitzt eine in Fig. 2 gezeigte Spannvorrichtung 15 zum Spannen der Kette 5. Die Spannvorrichtung 15 umfasst ein Spannglied 16 und ein Verstellglied 17. Zum Spannen der Kette 5 wird die Führungsschiene 4 gegenüber dem Gehäuse 6 in Richtung einer Längsmittelachse 18 (Fig. 1) der Führungsschiene 4 bewegt. Das Spannglied 16 greift hierzu formschlüssig in zwei an der Führungsschiene 4 angeordnete kreisförmige Öffnungen 14 ein, so dass Kräfte vom Spannglied 16 auf die Führungsschiene 4, insbesondere in Richtung der Längsmittelachse 18 der Führungsschiene 4, übertragen werden können.The chainsaw 1 has an in Fig. 2 The tensioning device 15 shown for tensioning the chain 5. The tensioning device 15 comprises a tensioning element 16 and an adjusting element 17. To tension the chain 5, the guide rail 4 is moved relative to the housing 6 in the direction of a longitudinal center axis 18 ( Fig. 1 ) the guide rail 4 moves. For this purpose, the clamping member 16 engages positively in two circular openings 14 arranged on the guide rail 4, so that forces can be transmitted from the clamping member 16 to the guide rail 4, in particular in the direction of the longitudinal center axis 18 of the guide rail 4.

Die Führungsschiene 4 besitzt einen Längsschlitz 13. Am Gehäuse 6 ist ein Bolzen 9 festgelegt, der in den Längsschlitz 13 eingreift. Der Längsschlitz 13 ermöglicht die Bewegung der Führungsschiene 4 in Richtung der Längsmittelachse 18 der Führungsschiene 4. Auf den Bolzen 9 ist ein Betätigungselement 11, welches eine Mutter 12 umfasst, aufschraubbar. Im in Fig. 3 gezeigten fixierten Zustand überdeckt der Kettenraddeckel 10 die Spannvorrichtung 15 und das Antriebsritzel 3. Der Kettenraddeckel 10 ist über das auf den Bolzen 9 aufgeschraubte Betätigungselement 11 am in Fig. 3 schematisch gezeigten Gehäuse 6 gehalten. Die Führungsschiene 4 ist in fixiertem Zustand durch das Betätigungselement 11 zwischen dem Kettenraddeckel 10 und dem Gehäuse 6 geklemmt gehalten.The guide rail 4 has a longitudinal slot 13. A bolt 9 is fixed on the housing 6 and engages in the longitudinal slot 13. The longitudinal slot 13 enables the movement of the guide rail 4 in the direction of the longitudinal center axis 18 of the guide rail 4. An actuating element 11, which comprises a nut 12, can be screwed onto the bolt 9. In the in Fig. 3 The fixed state shown, the sprocket cover 10 covers the tensioning device 15 and the drive pinion 3. The sprocket cover 10 is via the actuating element 11 screwed onto the bolt 9 on the in Fig. 3 housing 6 shown schematically held. In the fixed state, the guide rail 4 is held clamped between the sprocket cover 10 and the housing 6 by the actuating element 11.

Das Verstellglied 17 ist im Kettenraddeckel 10 um eine Drehachse 21 drehbar gelagert. Das Verstellglied 17 ist über eine Gewindeverbindung 20 mit dem Spannglied 16 verbunden. Aufgrund der Gewindeverbindung 20 bewirkt eine Drehung des Verstellglieds 17 um seine Drehachse 21 eine Bewegung des Spannglieds 16 in Richtung der Längsmittelachse 18 der Führungsschiene 4.The adjusting member 17 is mounted in the sprocket cover 10 so as to be rotatable about an axis of rotation 21. The adjusting member 17 is connected to the clamping member 16 via a threaded connection 20. Due to the threaded connection 20, a rotation of the adjusting member 17 about its axis of rotation 21 causes the clamping member 16 to move in the direction of the longitudinal center axis 18 of the guide rail 4.

Das Verstellglied 17 weist an seinem Außenumfang einen Gewindeabschnitt 22 mit vier Gewindegängen 23 auf. Das Spannglied 16 weist einen Gewindeabschnitt 24 auf. Der Gewindeabschnitt 22 des Verstellglieds 17 ist zum Eingriff in den Gewindeabschnitt 24 des Spannglieds 16 vorgesehen, wodurch die Gewindeverbindung 20 gebildet ist. Bei einer Drehung des Verstellglieds 17 um seine Drehachse 21 bewegt sich das Spannglied 16 in Richtung der Längsmittelachse 18 der Führungsschiene 4. Da das Spannglied 16 formschlüssig mit der Führungsschiene 4 verbunden ist, wird die Führungsschiene 4 zusammen mit dem Spannglied 16 in Richtung der Längsmittelachse 18 verstellt. Dadurch wird die Spannung der Kette 5 eingestellt.The adjusting member 17 has a threaded section 22 with four threads 23 on its outer circumference. The clamping member 16 has a threaded section 24. The threaded portion 22 of the adjusting member 17 is provided for engagement in the threaded portion 24 of the clamping member 16, whereby the threaded connection 20 is formed. When the adjusting member 17 is rotated about its axis of rotation 21, the clamping member 16 moves in the direction of the longitudinal center axis 18 of the guide rail 4 adjusted. This adjusts the tension of the chain 5.

Ist die gewünschte Spannung der Kette 5 eingestellt, so wird das Betätigungselement 11 mit der im Betätigungselement 11 eingespritzten Mutter 12 auf dem Bolzen 9 festgezogen. Dadurch wird die Führungsschiene 4 zwischen Bolzen 9 und Mutter 12 festgeklemmt.Once the desired tension of the chain 5 has been set, the actuating element 11 is tightened onto the bolt 9 with the nut 12 injected into the actuating element 11. As a result, the guide rail 4 is clamped between the bolt 9 and nut 12.

Der Kettenraddeckel 10 weist eine in den Fig. 5 und 8 gezeigte Öffnung 25 auf. Das in den Fig. 4 und 5 gezeigte Verstellglied 17 ragt mindestens teilweise durch die Öffnung 25 zu einer Außenseite 26 des Kettenraddeckels 10, so dass ein Bediener das Verstellglied 17 von außen drehen kann. Damit der Bediener das Verstellglied 17 einfach drehen kann, weist der Kettenraddeckel 10 eine Griffmulde 28 auf, die sich an den parallel zur Drehachse 21 des Verstellglieds 17 verlaufenden Seiten 27 der Öffnung 25 erstreckt.The sprocket cover 10 has one in the Fig. 5 and 8th Opening 25 shown. That in the Figures 4 and 5 The adjusting member 17 shown protrudes at least partially through the opening 25 to an outside 26 of the sprocket cover 10, so that an operator can rotate the adjusting member 17 from the outside. So that the operator can easily rotate the adjusting member 17, the sprocket cover 10 has a recessed grip 28 which extends on the sides 27 of the opening 25 running parallel to the axis of rotation 21 of the adjusting member 17.

Am Kettenraddeckel 10 ist im Bereich der Öffnung 25 eine einteilig mit dem Kettenraddeckel 10 ausgebildete Erhöhung 29 vorgesehen. Wie Fig. 3 zeigt, wölbt sich die Erhöhung 29 zur Außenseite 26 des Kettenraddeckels 10 und schließt im Bereich des Verstellglieds 17 etwa bündig mit dem Verstellglied 17 ab. Die Erhöhung 29 und das Verstellglied 17 liegen mindestens teilweise in einer Ebene.On the sprocket cover 10, in the area of the opening 25, an elevation 29 formed in one piece with the sprocket cover 10 is provided. As Fig. 3 shows, the elevation 29 arches towards the outside 26 of the sprocket cover 10 and ends approximately flush with the adjusting member 17 in the area of the adjusting member 17. The elevation 29 and the adjusting member 17 are at least partially in one plane.

Wie die Fig. 6 und 7 zeigen, weist das Spannglied 16 zwei Zapfen 30 auf. Im eingebauten Zustand greifen die Zapfen 30 in die Öffnungen 14 der Führungsschiene 4 (Fig. 2) und verbinden dadurch das Spannglied 16 in der Richtung der Längsmittelachse 18 (Fig. 1) der Führungsschiene 4 formschlüssig mit der Führungsschiene 4. Am Spannglied 16 sind Führungselemente 31 vorgesehen. Die hakenförmigen Führungselemente 31 ragen bei montierter Führungsschiene 4 in den Längsschlitz 13 der Führungsschiene 4 (Fig. 2) und liegen an der dem Antriebsritzel 3 zugewandten Seite der Führungsschiene 4 an der Führungsschiene 4 an.As the Fig. 6 and 7th show, the clamping member 16 has two pins 30. When installed, the pins 30 engage in the openings 14 of the guide rail 4 ( Fig. 2 ) and thereby connect the tendon 16 in the direction of the longitudinal center axis 18 ( Fig. 1 ) of the guide rail 4 in a form-fitting manner with the guide rail 4. Guide elements 31 are provided on the clamping member 16. When the guide rail 4 is mounted, the hook-shaped guide elements 31 protrude into the longitudinal slot 13 of the guide rail 4 ( Fig. 2 ) and rest on the side of the guide rail 4 facing the drive pinion 3 on the guide rail 4.

Wie die Figuren 6 und 7 auch zeigen, ist an einer Innenseite 32 des Kettenraddeckels 10 eine Wand 33 angeordnet. Die Wand 33 begrenzt einen Kanal, in dem die Sägekette (Fig. 1) läuft, nach außen. Damit wird weitgehend verhindert, dass sich Sägespäne im Kettenraddeckel 7 festsetzen.As the Figures 6 and 7th also show, a wall 33 is arranged on an inner side 32 of the sprocket cover 10. The wall 33 delimits a channel in which the saw chain ( Fig. 1 ) runs to the outside. This largely prevents sawdust from getting stuck in the sprocket cover 7.

Wie die Fig. 8 und 9 zeigen, sind am Kettenraddeckel 10 Aufnahmen 34 zur drehbaren Lagerung des Verstellglieds 17 (Fig. 3) vorgesehen. Jede der Aufnahmen 34 verläuft etwa halbkreisförmig. In den Aufnahmen 34 sind an den Stirnseiten des Verstellglieds 17 angeordnete Lagerzapfen 35 (Fig. 3) gehalten. Im Ausführungsbeispiel sind an den Aufnahmen 34 Rastnasen 36 vorgesehen, so dass die zylinderförmigen Lagerzapfen 35 des Verstellglieds 17 (Fig. 3) in den Aufnahmen 34 des Kettenraddeckels 10 eingeklipst werden können. In einem weiteren Ausführungsbeispiel kann auch eine nicht gezeigte Lagerabdeckung, die Aufnahmen 34 für die Rastnasen 36 besitzt, und die am Kettenraddeckel 10 befestigt, beispielsweise auf den Kettenraddeckel 10 geschraubt ist, vorgesehen sein.As the Figures 8 and 9 show, on the sprocket cover 10 are receptacles 34 for the rotatable mounting of the adjusting member 17 ( Fig. 3 ) intended. Each of the receptacles 34 is approximately semicircular. Bearing journals 35 ( Fig. 3 ) held. In the exemplary embodiment, locking lugs 36 are provided on the receptacles 34 so that the cylindrical bearing journals 35 of the adjusting member 17 ( Fig. 3 ) can be clipped into the receptacles 34 of the sprocket cover 10. In a further exemplary embodiment, a bearing cover, not shown, which has receptacles 34 for the latching lugs 36 and which is fastened to the sprocket cover 10, for example screwed onto the sprocket cover 10, can also be provided.

Wie die Figuren 10 bis 13 zeigen, weist das Verstellglied 17 eine Betätigungskontur 39 auf. Ein Bediener kann das Verstellglied 17 an der Betätigungskontur 39 drehen. Die Betätigungskontur 39 umfasst im Ausführungsbeispiel vier Vertiefungen, die die Gewindegänge 23 unterbrechen. Im Ausführungsbeispiel sind die Vertiefungen als Nuten 41 ausgebildet. Jede der Nuten 41 ist durch zwei Flanken 42 (Fig. 12 und 13) begrenzt. Die Flanken 42 der Nuten 41 schließen jeweils einen Winkel α ein, der im Ausführungsbeispiel etwa 90° beträgt. Der Winkel α liegt vorteilhaft in einem Bereich von etwa 60° bis etwa 120°, insbesondere von etwa 70° bis etwa 110°.As the Figures 10 to 13 show, the adjusting member 17 has an actuating contour 39. An operator can rotate the adjusting member 17 on the actuating contour 39. In the exemplary embodiment, the actuating contour 39 comprises four depressions which interrupt the threads 23. In the exemplary embodiment, the depressions are designed as grooves 41. Each of the grooves 41 is formed by two flanks 42 ( Figures 12 and 13 ) limited. The flanks 42 of the grooves 41 each enclose an angle α, which in the exemplary embodiment is approximately 90 °. The angle α is advantageously in a range from approximately 60 ° to approximately 120 °, in particular from approximately 70 ° to approximately 110 °.

Die Längsrichtung der Nut 41 verläuft im Ausführungsbeispiel parallel zur Drehachse 21 (Fig. 10). In einem weiteren Ausführungsbeispiel kann die Längsrichtung der mindestens einen Nut 41 in Seitenansicht auf das Verstellglied 17 unter einem Winkel gegenüber der Drehachse 21 des Verstellglieds 17 verlaufen, wobei der Winkel vorteilhaft höchstens 40° beträgt.In the exemplary embodiment, the longitudinal direction of the groove 41 runs parallel to the axis of rotation 21 ( Fig. 10 ). In a further exemplary embodiment, the longitudinal direction of the at least one groove 41 in a side view of the adjusting member 17 can run at an angle with respect to the axis of rotation 21 of the adjusting member 17, the angle advantageously being at most 40 °.

Das Verstellglied 17 besitzt einen Grundkörper 44 mit einer zylindrischen Außenfläche 45, wobei die zylindrische Außenfläche 45 durch die Nuten 41 und die Gewindegänge 23 unterbrochen ist. Die Betätigungskontur 39 erstreckt sich über die gesamte axiale Länge des zylindrischen Grundkörpers 44 des Verstellglieds 17. Auch der Gewindeabschnitt 22 des Verstellglieds 17 erstreckt sich jeweils über die gesamte axiale Länge des Grundkörpers 44 des Verstellglieds 17. Es kann jedoch auch vorteilhaft sein, dass sich die Nuten 41 und die Gewindegänge 23 nur über einen Teilabschnitt der axialen Länge des Grundkörpers 44 erstrecken und vorteilhaft in axialer Richtung nur teilweise überlappen. Die Betätigungskontur 39 besitzt einen größten Abstand a zur Drehachse 21, der im Ausführungsbeispiel genau so groß ist wie der größte Abstand b des Außenumfangs des Gewindeabschnitts 22 des Verstellglieds 17 zur Drehachse 21. Der Außendurchmesser D des Verstellglieds 17, der im Ausführungsbeispiel identisch zum Außendurchmesser des Außenumfangs des Gewindeabschnitts 22 des Verstellglieds 17 ist, beträgt vorteilhaft mindestens 15 mm, insbesondere mindestens 20 mm.The adjusting member 17 has a base body 44 with a cylindrical outer surface 45, the cylindrical outer surface 45 being interrupted by the grooves 41 and the threads 23. The actuating contour 39 extends over the entire axial length of the cylindrical base body 44 of the adjusting member 17. The threaded section 22 of the adjusting member 17 also extends over the entire axial length of the base body 44 of the adjusting member 17. However, it can also be advantageous that the Grooves 41 and the threads 23 extend only over a portion of the axial length of the base body 44 and advantageously only partially overlap in the axial direction. The actuation contour 39 has a greatest distance a to the axis of rotation 21, which in the exemplary embodiment is exactly as great as the greatest distance b of the outer circumference of the threaded section 22 of the adjusting member 17 to the axis of rotation 21. The outer diameter D of the adjusting member 17, which in the exemplary embodiment is identical to the outer diameter of the The outer circumference of the threaded section 22 of the adjusting member 17 is advantageously at least 15 mm, in particular at least 20 mm.

Wie die Fig. 11 zeigt, ist das Gewinde des Gewindeabschnitts 22 als Trapezgewinde 46 ausgebildet, dessen Flankenwinkel β höchstens 60° beträgt. Wie die Figuren 14 bis 17 zeigen, ist auch das Gewinde des Gewindeabschnitts 24 des Spannglieds 16 als Trapezgewinde 47 ausgebildet, dessen Flankenwinkel γ (Fig. 14) höchstens 60° beträgt.As the Fig. 11 shows, the thread of the threaded section 22 is designed as a trapezoidal thread 46, the flank angle β of which is at most 60 °. As the Figures 14 to 17 show, the thread of the threaded section 24 of the tendon 16 is also designed as a trapezoidal thread 47, the flank angle γ ( Fig. 14 ) is at most 60 °.

Der Gewindeabschnitt 22 des Verstellglieds 17 (Fig. 10 bis 13) und der Gewindeabschnitt 24 des Spannglieds 16 (Fig. 14 bis 16) bestehen aus Kunststoff, insbesondere aus faserverstärktem Kunststoff. Im Ausführungsbeispiel bestehen das Verstellglied 17 und das Spannglied 16 vollständig aus Kunststoff.The threaded section 22 of the adjusting member 17 ( Figures 10 to 13 ) and the threaded section 24 of the tendon 16 ( Figures 14 to 16 ) are made of plastic, especially fiber-reinforced plastic. In the exemplary embodiment, the adjusting member 17 and the clamping member 16 are made entirely of plastic.

Wie die Figuren 10 bis 13 zeigen, weist das Verstellglied 17 eine Zentralbohrung 37 auf. Die Achse der Zentralbohrung 37 entspricht der Drehachse 21. Die Zentralbohrung 37 durchdringt das Verstellglied 17 komplett und dient als Gewichtsreduzierungsbohrung. Radial nach außen versetzt sind im Ausführungsbeispiel mehrere, nämlich vier, Kanäle 38 gebildet, die parallel zur Zentralbohrung 37 verlaufen und das Verstellglied 17 komplett durchdringen. Auch die Kanäle 38 sind zur Gewichtsreduzierung vorgesehen.As the Figures 10 to 13 show, the adjusting member 17 has a central bore 37. The axis of the central bore 37 corresponds to the axis of rotation 21. The central bore 37 penetrates the adjusting member 17 completely and serves as a weight reduction bore. In the exemplary embodiment, several, namely four, channels 38 are formed, offset radially outward, which run parallel to the central bore 37 and completely penetrate the adjusting member 17. The channels 38 are also provided for weight reduction.

Wie die Figuren 14 bis 19 zeigen, ist das Spannglied 16 flach ausgebildet. An einer Flachseite 48 trägt das Spannglied 16 den Gewindeabschnitt 24. Der Gewindeabschnitt 24 ist nicht durch vollständige Gewindegänge, sondern durch Teilabschnitte von benachbarten Gewindegängen gebildet. Das Spannglied 16 weist an seiner Flachseite 48 eine quer zur Längsmittelachse 18 der Führungsschiene 4 (Fig. 3) und quer zur Ebene der Führungsschiene 4 verlaufende Stufe 51 auf. Wie die Figuren. 18 und 19 zeigen, ist die Dicke d des Spannglieds 16 in einem ersten Teilbereich 49 des Spannglieds 16 kleiner als die Dicke e des Spannglieds 16 in einem zweiten Teilbereich 50 des Spannglieds 16. Die Dicken d und e sind dabei senkrecht zur Ebene der Führungsschiene 4 gemessen. Damit sind die Teilabschnitte der Gewindegänge des Gewindeabschnitts 24 im ersten Teilbereich 49 flachere Abschnitte eines vollständigen Gewindegangs als die Teilabschnitte der Gewindegänge im zweiten Teilbereich 50. Der Teilbereich 49 mit verringerter Dicke d ist dem Betätigungselement 11 (Fig. 2) zugewandt angeordnet, wie Fig. 3 zeigt. Bei Verstellen des Spannglieds 16 in Richtung der Längsmittelachse 18 ist durch die Stufe 51 gewährleistet, dass das Spannglied 16 sich unter das Betätigungselement 11 schieben kann.As the Figures 14 to 19 show, the clamping member 16 is flat. On a flat side 48, the clamping member 16 carries the threaded section 24. The threaded section 24 is not formed by complete threads, but by subsections of adjacent threads. The tension member 16 has on its flat side 48 a transverse to the longitudinal center axis 18 of the guide rail 4 ( Fig. 3 ) and step 51 running transversely to the plane of the guide rail 4. As the Characters. 18 and 19 show, the thickness d of the tendon 16 in a first portion 49 of the tendon 16 is smaller than the thickness e of the tendon 16 in a second portion 50 of the tendon 16. The thicknesses d and e are measured perpendicular to the plane of the guide rail 4. The sub-sections of the thread turns of the thread section 24 in the first sub-area 49 are thus flatter sections of a complete thread turn than that Sub-sections of the threads in the second sub-area 50. The sub-area 49 with reduced thickness d is the actuating element 11 ( Fig. 2 ) facing arranged like Fig. 3 shows. When adjusting the clamping member 16 in the direction of the longitudinal center axis 18, the step 51 ensures that the clamping member 16 can slide under the actuating element 11.

An der der Flachseite 48 abgewandt liegenden Seite trägt das Spannglied 16 die Zapfen 30 und die Führungselemente 31. Wie Fig. 17 zeigt, sind im Teilbereich 49 zwischen benachbarten Gewindegängen Durchbrechungen 40 gebildet. Dadurch kann eine sehr geringe Dicke d erreicht werden. Gleichzeitig kann bei einer Drehung des Verstellglieds 17 Schmutz aus den Gewindegängen des Spannglieds 16 gefördert werden.On the side facing away from the flat side 48, the clamping member 16 carries the pins 30 and the guide elements 31. How Fig. 17 shows, openings 40 are formed in sub-area 49 between adjacent threads. As a result, a very small thickness d can be achieved. At the same time, when the adjusting member 17 is rotated, dirt can be conveyed out of the threads of the clamping member 16.

Im Ausführungsbeispiel ist das Spannglied 16 ein separates Bauteil. Es kann jedoch auch zweckmäßig sein, dass das Spannglied 16 als Teil der Führungsschiene 4 ausgebildet ist.In the exemplary embodiment, the clamping member 16 is a separate component. However, it can also be expedient for the clamping member 16 to be designed as part of the guide rail 4.

Claims (14)

  1. Work apparatus having a guide bar (4) on which a chain (5) is driven in circulation, wherein the work apparatus has a tensioning device (15) for the chain (5), wherein the tensioning device (15) has a tensioning member (16) that acts on the guide bar (4) in the direction of a longitudinal centre axis (18) of the guide bar (4), and wherein the tensioning device (15) has a rotatably mounted adjustment member (17) that is connected to the tensioning member (16) via a threaded connection (20), wherein a rotation of the adjustment member (17) about its axis of rotation (21) causes the tensioning member (16) to move in the direction of the longitudinal centre axis (18) of the guide bar (4), wherein the adjustment member (17) has, on its outer circumference, a threaded portion (22) having at least one thread run (23), which is intended to engage with at least one threaded portion (24) of the tensioning member (16), and wherein the adjustment member (17) has an actuating contour (39) for the adjustment member (17) to be rotated by an operator, said actuating contour (39) comprising at least one recess, wherein the greatest distance (b) of the threaded portion (22) of the adjustment member (17) from the axis of rotation (21) is at least as large as the greatest distance (a) of the actuating contour (39) from the axis of rotation (21), characterized in that a sprocket wheel cover (10) of the work apparatus has an opening (25), and wherein the adjustment member (17) projects at least partially through the opening (25) as far as an outer side of the sprocket wheel cover (10), such that an operator can turn the adjustment member (17) from the outside by way of the actuating contour (39).
  2. Work apparatus according to Claim 1,
    characterized in that the at least one recess of the actuating contour (39) of the adjustment member (17) at least partially interrupts the at least one thread run (23) of the adjustment member (17).
  3. Work apparatus according to Claim 1 or 2,
    characterized in that the actuating contour (39) extends along a length portion (43) of the adjustment member (17), and in that the threaded portion (22) of the adjustment member (17) extends along the entire length of this length portion (43).
  4. Work apparatus according to Claim 3,
    characterized in that the adjustment member (17) has a main body (44) with a cylindrical outer face (45), and in that the actuating contour (39) and the threaded portion (22) each extend along the entire axial length of the main body (44) of the adjustment member (17).
  5. Work apparatus according to one of Claims 1 to 4,
    characterized in that the actuating contour (39) is formed by at least one groove (41).
  6. Work apparatus according to Claim 5,
    characterized in that the longitudinal direction of the at least one groove (41) of the actuating contour (39) extends at an angle of at most about 40° with respect to the axis of rotation (21) of the adjustment member (17).
  7. Work apparatus according to Claim 5 or 6,
    characterized in that the flanks (42) of the groove (41) enclose an angle (α) of about 60° to about 120° in a section plane perpendicular to the axis of rotation (21) of the adjustment member (17).
  8. Work apparatus according to one of Claims 1 to 7,
    characterized in that the adjustment member (17) is mounted in a rotatable manner on the sprocket wheel cover (10), wherein the adjustment member (17) is supported on the sprocket wheel cover (10) in the direction of the axis of rotation (21).
  9. Work apparatus according to one of Claims 1 to 8,
    characterized in that the sprocket wheel cover (10) has a recessed grip (28) on at least one side (27) of the opening (25) that extends parallel to the axis of rotation (21) of the adjustment member (17).
  10. Work apparatus according to one of Claims 1 to 9,
    characterized in that the adjustment member (17) has, on its end sides, bearing journals (35) that are retained in receptacles (34) in the sprocket wheel cover (10).
  11. Work apparatus according to one of Claims 1 to 10,
    characterized in that the work apparatus has an actuating element (11) for fixing the sprocket wheel cover (10) to the housing (6) of the work apparatus, which is arranged next to the tensioning device (15) on the sprocket wheel cover (10).
  12. Work apparatus according to Claim 11,
    characterized in that the tensioning member (16) is configured in a disc-like manner and carries the threaded portion (24) on a flat side (48), wherein the threaded portion (24) is formed by sub-portions of adjacent thread runs, and in that the flat side (48) carrying the threaded portion (24) has a step (51) extending transversely to the longitudinal centre axis (18) of the guide bar (4), wherein the thickness of the tensioning member (16) is reduced on that side of the step (51) that faces the actuating element (11).
  13. Work apparatus according to one of Claims 1 to 12,
    characterized in that the outside diameter of the adjustment member (17) is at least 15 mm.
  14. Work apparatus according to one of Claims 1 to 13,
    characterized in that the tensioning member (16) has at least one peg (30) that engages in an opening (14) in the guide bar (4) and as a result connects the tensioning member (16) to the guide bar (4) in a form-fitting manner in the direction of the longitudinal centre axis (18) of the guide bar (4).
EP15766398.0A 2014-09-26 2015-09-12 Work device Active EP3197651B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014014275.2A DE102014014275A1 (en) 2014-09-26 2014-09-26 implement
PCT/EP2015/001833 WO2016045773A1 (en) 2014-09-26 2015-09-12 Work device

Publications (2)

Publication Number Publication Date
EP3197651A1 EP3197651A1 (en) 2017-08-02
EP3197651B1 true EP3197651B1 (en) 2021-11-03

Family

ID=54148456

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15766398.0A Active EP3197651B1 (en) 2014-09-26 2015-09-12 Work device

Country Status (5)

Country Link
US (1) US10144146B2 (en)
EP (1) EP3197651B1 (en)
CN (1) CN107000241B (en)
DE (1) DE102014014275A1 (en)
WO (1) WO2016045773A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11673287B2 (en) * 2021-11-10 2023-06-13 Techtronic Cordless Gp Systems and methods of chainsaw tensioning

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3382898A (en) * 1966-05-16 1968-05-14 Charles M. Walker Chain saw attachment
SE469825B (en) * 1990-03-28 1993-09-27 Electrolux Ab Chain clamp device on chainsaw
SE511283C2 (en) * 1997-06-04 1999-09-06 Sandvik Ab Stretch mechanism and chain saw for chain saws
US6049986A (en) * 1997-10-02 2000-04-18 Blount, Inc. Chain saw guide bar equipped with chain tensioner
DE19931249A1 (en) * 1999-07-07 2001-01-11 Bosch Gmbh Robert Chain saw has chain tensioner module with tension bolt with T-shaped head and tension pulley
JP2002036203A (en) 2000-07-24 2002-02-05 Ryobi Ltd Tension adjuster for saw chain
DE20118322U1 (en) * 2001-11-12 2002-01-17 Jenn Feng Ind Co Device for adjusting the tension of a chainsaw
SE0300611D0 (en) * 2003-03-06 2003-03-06 Electrolux Ab Chain saw tensioning device
DE102004022170A1 (en) 2004-05-05 2006-01-12 Hans Einhell Ag chainsaw
JP5314496B2 (en) * 2009-05-20 2013-10-16 株式会社マキタ Chainsaw
CN204195612U (en) * 2014-09-19 2015-03-11 国家电网公司 A kind of novel quick adjustment opening movable wrench

Also Published As

Publication number Publication date
EP3197651A1 (en) 2017-08-02
DE102014014275A1 (en) 2016-03-31
CN107000241A (en) 2017-08-01
WO2016045773A1 (en) 2016-03-31
US20170266834A1 (en) 2017-09-21
US10144146B2 (en) 2018-12-04
CN107000241B (en) 2020-09-01

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