EP1440777B1 - Chain saw - Google Patents

Chain saw Download PDF

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Publication number
EP1440777B1
EP1440777B1 EP03026703A EP03026703A EP1440777B1 EP 1440777 B1 EP1440777 B1 EP 1440777B1 EP 03026703 A EP03026703 A EP 03026703A EP 03026703 A EP03026703 A EP 03026703A EP 1440777 B1 EP1440777 B1 EP 1440777B1
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EP
European Patent Office
Prior art keywords
lever
drive
blade
force reversal
chainsaw according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP03026703A
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German (de)
French (fr)
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EP1440777A1 (en
Inventor
Kvetoslav Hlavka
Manfred Kirchner
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Narex Ceska Lipa AS
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Narex Ceska Lipa AS
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Publication of EP1440777A1 publication Critical patent/EP1440777A1/en
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    • 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

Definitions

  • the invention relates to a chainsaw according to the preamble of claim 1 (see also CA 1106264)
  • the actuating element from a rotatable, but in axial Direction fixed bearing screw formed, the with the driving member in threaded engagement, so that shifted the driving member when turning the screw.
  • the present invention is therefore based on the object to create a chainsaw of the type mentioned in at the chain tension on handling relatively easy way can be adjusted.
  • the actuator may, for example, an outside of the device housing arranged, with the hand rotatable knob have, so that the operation is done without tools.
  • the chainsaw has a device housing, of which in the Drawing only a bearing cap 1 is shown.
  • the device housing further includes a drive motor, not shown, the only one in Figure 3 dash-dotted lines indicated drive wheel 2 drives, which is usually designed as a gear.
  • the chainsaw also has a front of the housing front 3 protruding sword 4, drawn the cut is, as well as guided around the drive wheel 2 and the sword 4 Saw chain 5 on, when operating the chainsaw of the drive wheel 2 is driven and the plate-like Formed sword 4 endlessly revolving. With the saw chain the respective sawing work is carried out.
  • the drive wheel 2 and the sword 4 are thus in the orbital plane of the saw chain 5 arranged one behind the other.
  • the sword 4 is on the bearing cap 1 in the direction of the drive wheel 2 out and away from this adjustable and in the fixable in each position.
  • the adjustment direction is in the drawing indicated by the double arrow 6.
  • the sword 4 in the embodiment one in the adjustment 6 extending longitudinal slot 7, in the two at a distance mutually arranged, projecting from the bearing cap 1 Guide pin 8, 9 engage, so that the sword 4 on the two guide pins 8, 9 sits.
  • the bearing cap 1 in the region of the longitudinal slot 7 of the sword 4 a Fixing 10 on which a fixing threaded bolt, not shown 10 is associated with the sword 4 can be fixed in the set position.
  • the threaded bolt For example, from the back of the bearing cap 1 forth through the fixing hole 10 and the longitudinal slot 7 be put so that outside the sword 4 against the Bearing cover 1 exciting fixing nut to be screwed can. With dissolved fixation, this can be done on the guide pin 8, 9 guided sword 4 are moved in the adjustment 6. By such a shift can be the voltage change the saw chain.
  • the sword takes 4 his the drive wheel 2 facing the end position, in the the saw chain can be removed or attached. To the To operate a chainsaw, the sword 4 is moved in the direction of Drive wheel adjusted away from the drive wheel 2.
  • the adjustment provided for adjusting the sword adjustment 11 has an externally operable by hand actuator 12, which is arranged on the outside of the device housing is.
  • the actuating element 12 is expediently rotatably mounted and has an outside of the device housing arranged, rotatable by hand knob 13 on. actuated the user the actuator 12, adjusted the chain tension. Depending on the direction of rotation of the knob 13th shifts the sword 4, the fixation is solved, for Drive wheel 2 towards or away from this.
  • the adjusting device 11 further includes a driving member 14, in a manner to be described in driving connection is with the actuator 12 and engages the sword 4.
  • the arrangement is such that when pressed of the actuating element 12, the driving member 14 and with this sword 4 is adjusted.
  • the adjusting device 11 further includes a Kraftumlenkteil 15, which is rotatable about an axis of rotation 16 on the device housing is arranged.
  • a Kraftumlenkteil 15 engage eccentrically to the axis of rotation 16 on the one hand with the actuating element 12th connected drive lever 17 and on the other hand with the Carrier member 14 connected output lever 18 at.
  • this rotary motion is the attack point 20 of the output lever 18 in the adjustment 6 moves, so that the rotational movement of the Kraftumlenkteils 15 in the adjustment movement of the driving member 14th and thus the sword 4 is implemented.
  • the Kraftumlenkteil 15 is suitably coaxial with the drive wheel 2 arranged.
  • the force deflection part 15 can also as in the embodiment, formed by a turntable 23 become.
  • the turntable 23 may be fixed to a Device housing or in the embodiment of the bearing cap. 1 arranged bearing neck 24 to be rotatably mounted, of the the drive wheel 2 driving shaft is penetrated.
  • the drive lever 17 is in its longitudinal direction 21 and the Output lever 18 in the adjustment 6 movably guided on Device housing arranged.
  • the guide means provided for this purpose are indicated only in FIG. Further is the drive lever 17 at the point of attack 19 via a Drive pin 25 and the output lever 18 at the point of attack 20 via a driven pin 26 hinged to the Kraftumlenkteil 15 connected.
  • the two pins 25, 26 are arranged parallel axis to the axis of rotation 16.
  • the respective Pin 25, 26 may be on the respective lever 17, 18 or on Kraftumlenkteil 15 may be arranged. In the embodiment they are located on the two levers 17, 18.
  • the drive lever 17 is linear in its longitudinal direction 21 and the output lever 18 is guided linearly in the adjustment direction 6 is, the drive pin 25 and the output pin 26 engage each in a larger cross section than the pin in question having bearing recess 27 and 28 on Kraftumlenkteil 15 in which they can relocate when adjusting.
  • the pins 25, 26 could also be fixed to the Kraftumlenkteil 15 be stored. In this case would be an articulated Connection between the actuator 12 and the drive lever 17 and a hinged connection between the output lever 18 and the driving member 14 required.
  • the two bearing recesses 27, 28 are each of a radially with respect to the pivot axis 16 directed slot educated.
  • the output lever 18 a stepped longitudinal shape.
  • the attack site 20 on Kraftumlenkteil 15 facing lever portion 29 is of the rotation axis 16 further away than the driving member 14th facing lever portion 30, which in Figure 3 by the sword 4 is covered.
  • the driving member 14 is in the embodiment from a seated on the output lever 18 driving pin 31 formed in a driving recess 22 in the sword 4 engages.
  • the angular position of the drive lever 17, i. the course direction its longitudinal direction 21, and the location of the attack site 19 on Kraftumlenkteil 15 depend on the location of the Actuator 12 outside the device housing. Conveniently, is the actuator 12, i. whose Knob 13, on the housing top, allowing it from the user is easily accessible. In this case, the drive lever 17 and the output lever 18 substantially at right angles arranged to each other. Furthermore, it is apparent from the drawing that the drive lever 17 and the output lever 18 in Direction of rotation about the axis of rotation 16 offset by about 90 ° to each other attack on Kraftumlenkteil 15.
  • the rotatably mounted on the device housing actuator 12 is connected via a screw drive with the drive lever 17, so that this when turning the knob 13th moved in its longitudinal direction 21.
  • the drive lever 17 a threaded projection 33, with a on the actuating element 12 arranged mating thread 34 in threaded engagement stands.
  • the point of attack 19 of the drive lever 17 on Kraftumlenkteil 15 is seen from the sword 4, beyond the Fulcrum 16. Furthermore, the point of attack 20 of the output lever 18 at Kraftumlenkteil 15 in the lower, i. in the actuator 12 remote region of the Kraftumlenkteils 15th arranged.
  • the arrangement is further made such that the two Attacks 19, 20 when adjusting the sword 4 between its two end positions each at right angles directed to the longitudinal direction of the lever concerned, of the axis of rotation 16 outgoing radius lines 35, 36 intersect.
  • the sword 4 is in the Drawing in his the drive wheel 2 facing end position.
  • To the sword 4 in the direction of the drive wheel 2 away To move and thus tension the saw chain 5, you twisted the knob 13 so that, for example, in Figure 3 of the Drive lever 17 is shifted down, so that the Kraftumlenkteil 15 rotates counterclockwise.

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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)
  • Valve Device For Special Equipments (AREA)
  • Knives (AREA)

Abstract

The chain saw has a housing with a motor-driven drive sprocket (2), a blade (4) and a saw chain (5). The spacing between the blade and the drive sprocket is adjustable by a device including a power diversion component (15) which is able to rotate round an axis (16) on the saw housing. A driving lever (17) and a driven lever (18) engage with this component. The drive lever is actuated by an operating element (12).

Description

Die Erfindung betrifft eine Kettensäge gemäß dem Oberbegriff von Anspruch 1 (siehe auch CA 1106264)The invention relates to a chainsaw according to the preamble of claim 1 (see also CA 1106264)

Bei einer aus der Praxis bekannten Kettensäge wird das Betätigungselement von einer verdrehbar, dabei jedoch in axialer Richtung feststehend gelagerten Stellschraube gebildet, die mit dem Mitnahmeglied in Gewindeeingriff steht, so dass sich das Mitnahmeglied beim Verdrehen der Stellschraube verlagert.In a chain saw known from practice, the actuating element from a rotatable, but in axial Direction fixed bearing screw formed, the with the driving member in threaded engagement, so that shifted the driving member when turning the screw.

Diese Verstellung ist in der Handhabung verhältnismäßig umständlich. Dabei treten vor allem Platzprobleme auf, da man in der Nähe des Schwerts hantieren muss. This adjustment is relatively cumbersome to handle. In particular, space problems occur because one must work near the sword.

Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, eine Kettensäge der eingangs genannten Art zu schaffen, bei der die Kettenspannung auf in der Handhabung verhältnismäßig einfache Weise verstellt werden kann.The present invention is therefore based on the object to create a chainsaw of the type mentioned in at the chain tension on handling relatively easy way can be adjusted.

Diese Aufgabe wird erfindungsgemäß durch eine Kettensäge gemäß Anspruch 1 gelöst.This object is achieved by a chainsaw according to claim 1.

Auf diese Weise erhält man sozusagen ein Verstellgetriebe, das es ermöglicht, das Betätigungselement an einer für die Handhabung günstigen Stelle des Gerätegehäuses anzuordnen. Dies wird mit verhältnismäßig wenig Teilen erreicht, so dass sich eine auch konstruktiv einfache Anordnung ergibt.In this way one obtains, so to speak, an adjusting mechanism, which makes it possible, the actuator on one for the Handling convenient location of the device housing to order. This is achieved with relatively few parts, so that a structurally simple arrangement results.

Das Betätigungselement kann beispielsweise einen außen am Gerätegehäuse angeordneten, mit der Hand verdrehbaren Drehknopf aufweisen, so dass die Betätigung werkzeuglos erfolgt.The actuator may, for example, an outside of the device housing arranged, with the hand rotatable knob have, so that the operation is done without tools.

Weitere zweckmäßige Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben.Further expedient embodiments of the invention are in the Subclaims specified.

Ein Ausführungsbeispiel der Erfindung wird nun anhand der Zeichnung beschrieben. Es zeigen:

Figur 1
den rückwärtigen Bereich des Schwerts einer Ketten- säge zusammen mit dem von einem Lagerdeckel gebil- deten Bereich des Gerätegehäuses, an dem das Schwert befestigt wird, in Schrägansicht von außen her gesehen,
Figur 2
die Anordnung nach Figur 1 in Schrägansicht von der entgegengesetzten Innenseite her gesehen,
Figur 3
die Anordnung nach Figur 1 in Seitenansicht von au- ßen her gesehen entsprechend der Figur 1, wobei der Lagerschild weggelassen und das Antriebsrad und die Sägekette strichpunktiert angedeutet sind,
Figur 4
die Anordnung nach Figur 3 ohne angedeutete Säge- kette in entgegengesetzter Seitenansicht (entsprechend Figur 2),
Figur 5
die Anordnung nach Figur 3 im stufenförmig verlau- fenden Schnitt gemäß der Schnittlinie V-V in Figur 3 und
Figur 6
wiederum die Anordnung nach Figur 3, hier jedoch im Schnitt gemäß der Schnittlinie VI-VI.
Kettensägen, die wie vorliegend als Handgerät ausgebildet sind, sind allgemein bekannt, so dass nachstehend die Beschreibung das die vorliegende Erfindung betreffenden Bereichs der Kettensäge genügt.An embodiment of the invention will now be described with reference to the drawing. Show it:
FIG. 1
the rear area of the blade of a chain saw, together with the area of the device housing, on which the sword is fastened, formed by a bearing cap, seen from the outside in an oblique view,
FIG. 2
the arrangement of Figure 1 viewed obliquely from the opposite inside,
FIG. 3
the arrangement of Figure 1 in side view seen from the outside Shen according to the figure 1, wherein the bearing plate omitted and the drive wheel and the saw chain are indicated by dash-dotted lines,
FIG. 4
3 shows the arrangement according to FIG. 3 without an indicated saw chain in an opposite side view (corresponding to FIG. 2),
FIG. 5
3 shows the arrangement according to FIG. 3 in a stepwise section according to the section line VV in FIG
FIG. 6
again the arrangement of Figure 3, but here in section along the section line VI-VI.
Chain saws, which are designed as a hand-held device as is the case in the present case, are generally known, so that the description below satisfies the area of the chain saw relating to the present invention.

Die Kettensäge weist ein Gerätegehäuse auf, von dem in der Zeichnung nur ein Lagerdeckel 1 gezeigt ist. Das Gerätegehäuse enthält ferner einen nicht dargestellten Antriebsmotor, der ein nur in Figur 3 strichpunktiert angedeutetes Antriebsrad 2 treibt, das üblicherweise als Zahnrad ausgebildet ist. Die Kettensäge weist des weiteren ein vor die Gehäuse-Vorderseite 3 vorstehendes Schwert 4, das abgeschnitten gezeichnet ist, sowie eine um das Antriebsrad 2 und das Schwert 4 geführte Sägekette 5 auf, die beim Betrieb der Kettensäge von dem Antriebsrad 2 angetrieben wird und um das plattenartige Gestalt aufweisende Schwert 4 endlos umläuft. Mit der Sägekette wird die jeweilige Sägearbeit ausgeführt. Das Antriebsrad 2 und das Schwert 4 sind somit in der Umlaufebene der Sägekette 5 hintereinander angeordnet.The chainsaw has a device housing, of which in the Drawing only a bearing cap 1 is shown. The device housing further includes a drive motor, not shown, the only one in Figure 3 dash-dotted lines indicated drive wheel 2 drives, which is usually designed as a gear. The chainsaw also has a front of the housing front 3 protruding sword 4, drawn the cut is, as well as guided around the drive wheel 2 and the sword 4 Saw chain 5 on, when operating the chainsaw of the drive wheel 2 is driven and the plate-like Formed sword 4 endlessly revolving. With the saw chain the respective sawing work is carried out. The drive wheel 2 and the sword 4 are thus in the orbital plane of the saw chain 5 arranged one behind the other.

Das Schwert 4 ist am Lagerdeckel 1 in Richtung zum Antriebsrad 2 hin und von diesem weg geführt verstellbar und in der jeweiligen Position fixierbar. Die Verstellrichtung wird in der Zeichnung durch den Doppelpfeil 6 angegeben. Hierzu weist das Schwert 4 beim Ausführungsbeispiel einen in Verstellrichtung 6 verlaufenden Längsschlitz 7 auf, in den zwei mit Abstand zueinander angeordnete, vom Lagerdeckel 1 abstehende Führungszapfen 8, 9 eingreifen, so dass das Schwert 4 auf den beiden Führungszapfen 8, 9 sitzt. Ferner weist der Lagerdeckel 1 im Bereich des Längsschlitzes 7 des Schwerts 4 eine Fixierbohrung 10 auf, die einem nicht dargestellten Fixier-Gewindebolzen 10 zugeordnet ist, mit dem sich das Schwert 4 in der jeweils eingestellten Position fixieren lässt. Der Gewindebolzen kann beispielsweise von der Rückseite des Lagerdeckels 1 her durch die Fixierbohrung 10 und den Längsschlitz 7 gesteckt sein, so dass außen eine das Schwert 4 gegen den Lagerdeckel 1 spannende Fixiermutter aufgeschraubt werden kann. Bei gelöster Fixierung kann das auf den Führungszapfen 8, 9 geführte Schwert 4 in Verstellrichtung 6 verschoben werden. Durch ein solches Verschieben lässt sich die Spannung der Sägekette verändern. In der Zeichnung nimmt das Schwert 4 seine dem Antriebsrad 2 zugewandte Endstellung ein, in der sich die Sägekette wegnehmen oder anbringen lässt. Um die Kettensäge zu betreiben, wird das Schwert 4 in Richtung vom Antriebsrad vom Antriebsrad 2 weg verstellt.The sword 4 is on the bearing cap 1 in the direction of the drive wheel 2 out and away from this adjustable and in the fixable in each position. The adjustment direction is in the drawing indicated by the double arrow 6. For this purpose points the sword 4 in the embodiment one in the adjustment 6 extending longitudinal slot 7, in the two at a distance mutually arranged, projecting from the bearing cap 1 Guide pin 8, 9 engage, so that the sword 4 on the two guide pins 8, 9 sits. Furthermore, the bearing cap 1 in the region of the longitudinal slot 7 of the sword 4 a Fixing 10 on which a fixing threaded bolt, not shown 10 is associated with the sword 4 can be fixed in the set position. The threaded bolt For example, from the back of the bearing cap 1 forth through the fixing hole 10 and the longitudinal slot 7 be put so that outside the sword 4 against the Bearing cover 1 exciting fixing nut to be screwed can. With dissolved fixation, this can be done on the guide pin 8, 9 guided sword 4 are moved in the adjustment 6. By such a shift can be the voltage change the saw chain. In the drawing, the sword takes 4 his the drive wheel 2 facing the end position, in the the saw chain can be removed or attached. To the To operate a chainsaw, the sword 4 is moved in the direction of Drive wheel adjusted away from the drive wheel 2.

Die zum Verstellen des Schwerts vorgesehene Verstelleinrichtung 11 weist ein von außen her von Hand betätigbares Betätigungselement 12 auf, das außen am Gerätegehäuse angeordnet ist. Dabei ist das Betätigungselement 12 zweckmäßigerweise verdrehbar gelagert und weist einen außen am Gerätegehäuse angeordneten, mit der Hand verdrehbaren Drehknopf 13 auf. Betätigt der Benutzer das Betätigungselement 12, verstellt sich die Kettenspannung. Je nach Drehrichtung des Drehknopfes 13 verschiebt sich das Schwert 4, ist die Fixierung gelöst, zum Antriebsrad 2 hin oder von diesem weg.The adjustment provided for adjusting the sword adjustment 11 has an externally operable by hand actuator 12, which is arranged on the outside of the device housing is. In this case, the actuating element 12 is expediently rotatably mounted and has an outside of the device housing arranged, rotatable by hand knob 13 on. actuated the user the actuator 12, adjusted the chain tension. Depending on the direction of rotation of the knob 13th shifts the sword 4, the fixation is solved, for Drive wheel 2 towards or away from this.

Die Verstelleinrichtung 11 enthält ferner ein Mitnahmeglied 14, das in noch zu beschreibender Weise in treibender Verbindung mit dem Betätigungselement 12 steht und am Schwert 4 angreift. Dabei ist die Anordnung so getroffen, dass beim Betätigen des Betätigungselements 12 das Mitnahmeglied 14 und mit diesem das Schwert 4 verstellt wird.The adjusting device 11 further includes a driving member 14, in a manner to be described in driving connection is with the actuator 12 and engages the sword 4. The arrangement is such that when pressed of the actuating element 12, the driving member 14 and with this sword 4 is adjusted.

Die Verstelleinrichtung 11 weist ferner ein Kraftumlenkteil 15 auf, das um eine Drehachse 16 verdrehbar am Gerätegehäuse angeordnet ist. An dem Kraftumlenkteil 15 greifen exzentrisch zur Drehachse 16 einerseits ein mit dem Betätigungselement 12 verbundener Antriebshebel 17 und andererseits ein mit dem Mitnahmeglied 14 verbundener Abtriebshebel 18 an. Dabei sind die beiden Angriffsstellen 19, 20, an denen der Antriebshebel 17 und der Abtriebshebel 18 am Kraftumlenkteil 15 angreifen, bezüglich der Drehachse 16 mit Winkelabstand zueinander angeordnet. Betätigt man das Betätigungselement 12, treibt es den Antriebshebel 17 zu einer Bewegung in dessen Längsrichtung 21 und über den Antriebshebel 17 das Kraftumlenkteil 15 in Drehrichtung 22 um die Drehachse 16 an. Bei dieser Drehbewegung wird über die Angriffsstelle 20 der Abtriebshebel 18 in Verstellrichtung 6 bewegt, so dass die Drehbewegung des Kraftumlenkteils 15 in die Verstellbewegung des Mitnahmeglieds 14 und somit des Schwerts 4 umgesetzt wird.The adjusting device 11 further includes a Kraftumlenkteil 15, which is rotatable about an axis of rotation 16 on the device housing is arranged. At the Kraftumlenkteil 15 engage eccentrically to the axis of rotation 16 on the one hand with the actuating element 12th connected drive lever 17 and on the other hand with the Carrier member 14 connected output lever 18 at. There are the two points of attack 19, 20, where the drive lever 17 and the output lever 18 on Kraftumlenkteil 15 attack, with respect to the axis of rotation 16 with angular distance from each other. If you press the actuator 12, it drives the Drive lever 17 to move in the longitudinal direction 21st and via the drive lever 17, the Kraftumlenkteil 15 in the direction of rotation 22 about the rotation axis 16 at. In this rotary motion is the attack point 20 of the output lever 18 in the adjustment 6 moves, so that the rotational movement of the Kraftumlenkteils 15 in the adjustment movement of the driving member 14th and thus the sword 4 is implemented.

Das Kraftumlenkteil 15 ist zweckmäßigerweise koaxial zum Antriebsrad 2 angeordnet. Das Kraftumlenkteil 15 kann ferner, wie beim Ausführungsbeispiel, von einem Drehteller 23 gebildet werden. Der Drehteller 23 kann auf einem feststehend am Gerätegehäuse bzw. beim Ausführungsbeispiel am Lagerdeckel 1 angeordneten Lagerhals 24 drehbar gelagert sein, der von der das Antriebsrad 2 treibenden Welle durchgriffen wird. The Kraftumlenkteil 15 is suitably coaxial with the drive wheel 2 arranged. The force deflection part 15 can also as in the embodiment, formed by a turntable 23 become. The turntable 23 may be fixed to a Device housing or in the embodiment of the bearing cap. 1 arranged bearing neck 24 to be rotatably mounted, of the the drive wheel 2 driving shaft is penetrated.

Der Antriebshebel 17 ist in seiner Längsrichtung 21 und der Abtriebshebel 18 in Verstellrichtung 6 bewegbar geführt am Gerätegehäuse angeordnet. Die hierzu vorgesehenen Führungseinrichtungen sind lediglich in Figur 2 angedeutet. Ferner ist der Antriebshebel 17 an der Angriffsstelle 19 über einen Antriebszapfen 25 und der Abtriebshebel 18 an der Angriffsstelle 20 über einen Abtriebszapfen 26 gelenkig mit dem Kraftumlenkteil 15 verbunden. Die beiden Zapfen 25, 26 sind parallelachsig zur Drehachse 16 angeordnet. Der jeweilige Zapfen 25, 26 kann am betreffenden Hebel 17, 18 oder am Kraftumlenkteil 15 angeordnet sein. Beim Ausführungsbeispiel befinden sie sich an den beiden Hebeln 17, 18.The drive lever 17 is in its longitudinal direction 21 and the Output lever 18 in the adjustment 6 movably guided on Device housing arranged. The guide means provided for this purpose are indicated only in FIG. Further is the drive lever 17 at the point of attack 19 via a Drive pin 25 and the output lever 18 at the point of attack 20 via a driven pin 26 hinged to the Kraftumlenkteil 15 connected. The two pins 25, 26 are arranged parallel axis to the axis of rotation 16. The respective Pin 25, 26 may be on the respective lever 17, 18 or on Kraftumlenkteil 15 may be arranged. In the embodiment they are located on the two levers 17, 18.

Da der Antriebshebel 17 linear in seiner Längsrichtung 21 und der Abtriebshebel 18 linear in Verstellrichtung 6 geführt ist, greifen der Antriebszapfen 25 und der Abtriebszapfen 26 jeweils in eine größeren Querschnitt als der betreffende Zapfen aufweisende Lagerausnehmung 27 bzw. 28 am Kraftumlenkteil 15 ein, in denen sie sich beim Verstellen verlagern können.Since the drive lever 17 is linear in its longitudinal direction 21 and the output lever 18 is guided linearly in the adjustment direction 6 is, the drive pin 25 and the output pin 26 engage each in a larger cross section than the pin in question having bearing recess 27 and 28 on Kraftumlenkteil 15 in which they can relocate when adjusting.

Die Zapfen 25, 26 könnten jedoch auch ortsfest am Kraftumlenkteil 15 gelagert sein. In diesem Falle wäre eine gelenkige Verbindung zwischen dem Betätigungselement 12 und dem Antriebshebel 17 und eine gelenkige Verbindung zwischen dem Abtriebshebel 18 und dem Mitnahmeglied 14 erforderlich.However, the pins 25, 26 could also be fixed to the Kraftumlenkteil 15 be stored. In this case would be an articulated Connection between the actuator 12 and the drive lever 17 and a hinged connection between the output lever 18 and the driving member 14 required.

Die beiden Lagerausnehmungen 27, 28 werden jeweils von einem radial mit Bezug auf die Schwenkachse 16 gerichteten Langloch gebildet.The two bearing recesses 27, 28 are each of a radially with respect to the pivot axis 16 directed slot educated.

Wie aus der Zeichnung ersichtlich ist, weist der Abtriebshebel 18 eine gestufte Längsgestalt auf. Der der Angriffsstelle 20 am Kraftumlenkteil 15 zugewandte Hebelbereich 29 ist von der Drehachse 16 weiter entfernt als der dem Mitnahmeglied 14 zugewandte Hebelbereich 30, der in Figur 3 durch das Schwert 4 verdeckt ist. Das Mitnahmeglied 14 wird beim Ausführungsbeispiel von einem am Abtriebshebel 18 sitzenden Mitnahmezapfen 31 gebildet, der in eine Mitnahmeausnehmung 22 im Schwert 4 eingreift.As can be seen from the drawing, the output lever 18 a stepped longitudinal shape. The attack site 20 on Kraftumlenkteil 15 facing lever portion 29 is of the rotation axis 16 further away than the driving member 14th facing lever portion 30, which in Figure 3 by the sword 4 is covered. The driving member 14 is in the embodiment from a seated on the output lever 18 driving pin 31 formed in a driving recess 22 in the sword 4 engages.

Die Winkellage des Antriebshebels 17, d.h. die Verlaufsrichtung seiner Längsrichtung 21, sowie die Lage der Angriffsstelle 19 am Kraftumlenkteil 15 richten sich nach dem Ort des Betätigungselements 12 außen am Gerätegehäuse. Zweckmäßigerweise befindet sich das Betätigungselement 12, d.h. dessen Drehknopf 13, an der Gehäuse-Oberseite, so dass es vom Benutzer bequem erreichbar ist. In diesem Falle sind der Antriebshebel 17 und der Abtriebshebel 18 im wesentlichen rechtwinklig zueinander angeordnet. Ferner ergibt sich aus der Zeichnung, dass der Antriebshebel 17 und der Abtriebshebel 18 in Drehrichtung um die Drehachse 16 um etwa 90° versetzt zueinander am Kraftumlenkteil 15 angreifen.The angular position of the drive lever 17, i. the course direction its longitudinal direction 21, and the location of the attack site 19 on Kraftumlenkteil 15 depend on the location of the Actuator 12 outside the device housing. Conveniently, is the actuator 12, i. whose Knob 13, on the housing top, allowing it from the user is easily accessible. In this case, the drive lever 17 and the output lever 18 substantially at right angles arranged to each other. Furthermore, it is apparent from the drawing that the drive lever 17 and the output lever 18 in Direction of rotation about the axis of rotation 16 offset by about 90 ° to each other attack on Kraftumlenkteil 15.

Das verdrehbar am Gerätegehäuse gelagerte Betätigungselement 12 ist über einen Gewindetrieb mit dem Antriebshebel 17 verbunden, so dass sich dieser beim Verdrehen des Drehknopfes 13 in seiner Längsrichtung 21 bewegt. Hierzu weist der Antriebshebel 17 einen Gewindeansatz 33 auf, der mit einem am Betätigungselement 12 angeordneten Gegengewinde 34 in Gewindeeingriff steht.The rotatably mounted on the device housing actuator 12 is connected via a screw drive with the drive lever 17, so that this when turning the knob 13th moved in its longitudinal direction 21. For this purpose, the drive lever 17 a threaded projection 33, with a on the actuating element 12 arranged mating thread 34 in threaded engagement stands.

Die Angriffsstelle 19 des Antriebshebels 17 am Kraftumlenkteil 15 befindet sich vom Schwert 4 aus gesehen jenseits der Drehachse 16. Ferner ist die Angriffsstelle 20 des Abtriebshebels 18 am Kraftumlenkteil 15 im unteren, d.h. im dem Betätigungselement 12 abgewandten Bereich des Kraftumlenkteils 15 angeordnet.The point of attack 19 of the drive lever 17 on Kraftumlenkteil 15 is seen from the sword 4, beyond the Fulcrum 16. Furthermore, the point of attack 20 of the output lever 18 at Kraftumlenkteil 15 in the lower, i. in the actuator 12 remote region of the Kraftumlenkteils 15th arranged.

Dabei ist die Anordnung ferner so getroffen, dass die beiden Angriffsstellen 19, 20 beim Verstellen des Schwerts 4 zwischen seinen beiden Endstellungen die jeweils rechtwinklig zur Längsrichtung des betreffenden Hebels gerichteten, von der Drehachse 16 ausgehenden Radiuslinien 35, 36 kreuzen. The arrangement is further made such that the two Attacks 19, 20 when adjusting the sword 4 between its two end positions each at right angles directed to the longitudinal direction of the lever concerned, of the axis of rotation 16 outgoing radius lines 35, 36 intersect.

Wie bereits erwähnt, befindet sich das Schwert 4 in der Zeichnung in seiner dem Antriebsrad 2 zugewandten Endstellung. Um das Schwert 4 in Richtung vom Antriebsrad 2 weg zu bewegen und somit die Sägekette 5 zu spannen, verdreht man den Drehknopf 13 so, dass sich beispielsweise in Figur 3 der Antriebshebel 17 nach unten verlagert, so dass sich das Kraftumlenkteil 15 entgegen der Uhrzeigerrichtung dreht.As already mentioned, the sword 4 is in the Drawing in his the drive wheel 2 facing end position. To the sword 4 in the direction of the drive wheel 2 away To move and thus tension the saw chain 5, you twisted the knob 13 so that, for example, in Figure 3 of the Drive lever 17 is shifted down, so that the Kraftumlenkteil 15 rotates counterclockwise.

Claims (12)

  1. Chainsaw, with a tool housing with a drive motor driving a drive wheel, a blade extending in front of the housing front, and a continuously revolving saw chain guided around the drive wheel and the blade, wherein the blade, for varying the chain tension, is guided adjustably on the tool housing towards and away from the drive wheel and may be fixed in the respective position, and the adjusting device provided for this purpose has an actuating element actuable by hand from the outside and a driving element acting on the blade and in driving connection with the actuating element, such that with the fixing of the blade released, on actuation of the actuating element the driving element and with it the blade are adjusted, wherein the adjusting device (11) contains a force reversal element (15) located on the tool housing, rotatable around a rotation axis (16), characterised in that a drive lever (17) and a driven lever (18) act on the force reversal element (15), eccentrically to the rotation axis (16) and with angular clearance from one another, with the drive lever (17) being drivable through actuation of the actuating element (12), and with the driven lever (18) connected to the driving element (14), so that on actuation of the actuating element (12) the force reversal element (15) executes a rotary movement which is converted via the driven lever (18) into the adjusting movement of the driving element (14).
  2. Chainsaw according to claim 1, characterised in that the force reversal element (15) is mounted coaxially to the drive wheel (2).
  3. Chainsaw according to claim 1 or 2, characterised in that the force reversal element (15) is formed by a rotary disc (23).
  4. Chainsaw according to any of claims 1 to 3, characterised in that the drive lever (17) and/or the driven lever (18) are guided in their lever longitudinal directions and hinged to the force reversal element (15) via a driving pin (25) or a driven pin (26), with the respective pin (25, 26) mounted on the relevant lever (17, 18) or on the force reversal element and engaging in a bearing recess (27, 28) on the force reversal element (15) or on the relevant lever which has a larger cross-section than the pin (25, 26), and in which the relevant pin (25, 26) may shift.
  5. Chainsaw according to claim 4, characterised in that at least one bearing recess (27, 28) is formed by an oblong hole oriented radially relative to the rotation axis (16).
  6. Chainsaw according to claim 4 or 5, characterised in that the driven lever (18) is guided parallel to the adjustment direction (6) of the blade (4).
  7. Chainsaw according to any of claims 1 to 6, characterised in that the drive lever (17) and the driven lever (18) are arranged substantially at right-angles to one another.
  8. Chainsaw according to any of claims 1 to 7, characterised in that the drive lever (17) and the driven lever (18) act on the force reversal element (15) offset relative to one another at around 90° in the direction of rotation.
  9. Chainsaw according to any of claims 1 to 8, characterised in that the point of application (19) of the drive lever (17) on the force reversal element (15), seen from the blade (4), is located on the other side of the rotation axis (16), and the point of application (20) of the driven lever (18) on the force reversal element (15) is located in the lower part of the force reversal element (15), i.e. the part facing away from the actuating element (12).
  10. Chainsaw according to any of claims 1 to 9, characterised in that, during adjustment of the blade (4) between its two end positions, the points of application (19, 20) at which the drive lever (17) and the driven lever (18) act on the force reversal element (15), intersect the radius lines (35, 36) which originate at the rotation axis (16) and are each oriented at right-angles to the longitudinal direction of the relevant lever (17, 18).
  11. Chainsaw according to any of claims 1 to 10, characterised in that the actuating element (12) is mounted rotatably and is connected to the drive lever (17) via a threaded drive.
  12. Chainsaw according to any of claims 1 to 11, characterised in that the actuating element (12) has a control knob (13), which may be turned by hand, and is provided on the outside of the tool housing.
EP03026703A 2003-01-25 2003-11-21 Chain saw Expired - Lifetime EP1440777B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10302872A DE10302872A1 (en) 2003-01-25 2003-01-25 chainsaw
DE10302872 2003-01-25

Publications (2)

Publication Number Publication Date
EP1440777A1 EP1440777A1 (en) 2004-07-28
EP1440777B1 true EP1440777B1 (en) 2005-09-28

Family

ID=32520096

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03026703A Expired - Lifetime EP1440777B1 (en) 2003-01-25 2003-11-21 Chain saw

Country Status (3)

Country Link
EP (1) EP1440777B1 (en)
AT (1) ATE305374T1 (en)
DE (2) DE10302872A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0515970D0 (en) * 2005-08-03 2005-09-07 Bosch Gmbh Robert Chain saw

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1106264A (en) * 1979-04-20 1981-08-04 Norman C. Bricker Chain saw bar tightener
DE19931250A1 (en) * 1999-07-07 2001-01-11 Bosch Gmbh Robert chainsaw

Also Published As

Publication number Publication date
DE50301256D1 (en) 2005-11-03
ATE305374T1 (en) 2005-10-15
DE10302872A1 (en) 2004-08-05
EP1440777A1 (en) 2004-07-28

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