EP2408600B1 - Chainsaw comprising a quick tensioning unit and a guide bar - Google Patents

Description

The invention relates to a chain saw comprising a quick-release device and a sword.

Known chainsaws include a main body with one or more handles to hold the chain saw in use and a saw chain / sword assembly removably attached to the main body. In the main body is a drive unit, in particular an electric or internal combustion engine, which drives a drive pinion, which is in communication with the saw chain for driving. The sword is a substantially elongated, rectangular and flat body with a rounded end, which has on its outer edge a guide groove for guiding the saw chain.

In view of a desired ease of use, conventional chainsaws have a number of disadvantages. For example, a chainsaw is usually offered packaged in the trade, that find their sword and chain as separate parts next to the main body in the package, so that the customer must assemble the parts themselves before putting the saw. This is often not easy even for an experienced user. For this purpose, a housing cover located on the housing, which covers the chain drive in the sawing operation, usually has to be removed from the main body. This is often not possible without tools. Then the saw chain has to be looped around the sword that it runs in the guide groove of the sword. Only now can the sword with the saw chain attached to it be connected to the main body of the chain saw. Care must be taken to ensure that the saw chain does not slip out of the guide groove in the blade and that the saw chain rests correctly on the drive pinion connected to the drive unit.

Following this installation, the housing cover can then be reapplied, whereby it can not yet be locked in its final position, since before the tension of the saw chain on the sword must be properly adjusted. This is necessary for safety reasons, but also to optimize the sawing properties. Otherwise, there is a particular danger that the saw chain jumps from the sword during operation of the chainsaw and inflicts serious injuries on the operator. However, manually setting the optimum chain tension is difficult and requires experience and practice. In conventional chain saws, the tension of the chain is often possible via a lever located on the chain saw. After the voltage has been applied, the housing is completely locked in its final position and serves in this way to fix the sword between the machine and the housing cover.

Since both the saw chain and the sword wear out in the course of operation or become dull, they must be removed regularly for maintenance and cleaning activities from the main body of the chain saw. Thus, over the life cycle of a chain saw results in frequent and repeated insertion of the saw chain associated with the need to re-tension them correctly.

Also, the saw chain will lengthen over time due to the tensile stress acting on it during operation, so that even if the saw chain and the sword remain in the chain saw for a long time, a regular re-tensioning of the saw chain is necessary to continuously optimum safety and to ensure cutting action. Inexperienced users are often overwhelmed with this retightening of the saw chain. For this purpose, usually the housing cover must be released from its lock in order to move the sword to a suitable extent so far that the tension of the running thereon saw chain is corrected again. Following this, the housing cover to fix the sword is to be locked again on the main body.

From the SU 1 329 966 A1 is a chain saw with a quick-clamping device and with a drive unit known. The drive unit is provided for driving a running over a sword and a drive pinion saw chain. The drive pinion is connected to the drive unit via a drive shaft. The sword is slidably mounted to the chassis of a main body of the chain saw on a support surface, with a wedge mounted on the sword. A rotatable tension lever assembly is mounted on the chassis in the area of the drive shaft. The sword includes a counterwedge.

The object of the invention is therefore to form a chain saw or parts thereof so that attaching the saw chain and sword on the main body of the chain saw is easy to do and easy clamping of the saw chain is possible.

The object is achieved on the one hand with a chainsaw with the features of claim 1. Advantageous embodiments and further developments of the invention are described by the respective subclaims 2 to 20.

In the chain saw according to the invention comprising a quick-release device, a sword, a drive pinion, and a drive unit for driving a running over the sword and the drive pinion saw chain, the drive pinion is connected via a drive shaft with the drive unit in connection. The chassis of the chainsaw is provided with bearing surfaces on which the sword comes to rest on the main body during its mounting slide-movable. On the sword there is a wedge mounted, while on the chassis in the region of the drive shaft, a movable clamping lever assembly comprising a counter-wedge is mounted, which cooperates with the mounted on the sword wedge. The interaction of wedge and counterwedge causes the locking of the sword on the chainsaw and at the same time the tensioning of the saw chain. Because by the interaction of the two wedges on a surface inclined relative to the surface normal of the chassis of the chainsaw surface is both a contact pressure, which presses the sword on the chassis, as well as a sliding pressure, which pushes the sword away from the drive pinion generated.

As part of the automatic clamping and locking operation, the clamping lever assembly on the one hand on an open position in which at least the saw chain and the sword can be removed from the main body of the chain saw, and on the other hand, a closed position in which the saw chain stretched on the drive pinion and the sword and the sword is firmly locked to the chassis of the main body.

From the chassis of the main body extending connected to the drive unit of the chain saw drive shaft extends.

In a possible embodiment of the invention, the drive pinion is applied to this drive shaft only when mounting the chain unit to the chassis of the chain saw, for example by plugging.

In another possible embodiment of the invention, a drive pinion is already applied to the drive shaft before mounting a sword, so that during or after assembly of this sword, the saw chain is placed around the drive pinion.

In the chain unit with the quick-release device of the chainsaw, the sword, the saw chain and the drive pinion driving the saw chain form a structural unit. On the sword, a wedge and a spacer are mounted. The spacer is movably mounted in the longitudinal direction of the sword and is tensioned against the sword by spring force. The direction of the spring force is oriented in the direction of the drive pinion so that the spacer presses by means of the spring force, the drive pinion from the sword in the direction of the chain or pulls. In this way, the drive pinion is held with engagement in the chain between the chain and the sword. At the same time, the pressure force exerted by the spacer on the drive pinion causes the saw chain to be held in tension so that it does not automatically slip out of the guide groove in the blade. Preferably, a contact surface is formed on the drive pinion about the axis of rotation at which the spacer comes to rest.

In one possible embodiment of the chain unit, the wedge is firmly locked on the sword.

In an alternative embodiment of the chain unit, the wedge is mounted on the one hand movable relative to the sword along its longitudinal axis and movable relative to the spacer. In a particularly advantageous manner, the wedge is connected via micro gears with the sword.

On the sword with the quick-release device of the chain saw, which is suitable for use in the chain unit described above, a wedge is mounted. In one possible embodiment of the sword according to the invention, the wedge is firmly locked on the sword.

In another alternative embodiment of the sword, the wedge is movably mounted relative to the sword along its longitudinal axis. In a particularly advantageous manner, the wedge is connected via micro gears with the sword. Thus, the underside of the wedge lying on the sword is provided with a micro-toothing. A corresponding micro-toothing is applied along those longitudinal sections on the top of the sword, on which the wedge can move. The micro-toothing is preferably designed such that the wedge can be displaced with respect to the sword in only one direction along its longitudinal axis (this is with the sword mounted in the direction of the drive pinion).

Preferably, in addition to the wedge, the sword also has a spacer movably mounted in the longitudinal direction of the sword.

In a first advantageous embodiment of the quick-release device according to the invention a counter-holder is formed on the chassis in the region of the support surface for the sword, which preferably projects beyond this support surface vertically. In order to cooperate with this counter-holder, in the mounted on the sword wedge preferably the middle part, as well as corresponding to the underlying portion of the sword, so recessed that when applying the chain unit on the support surface of the anvil can penetrate the wedge in this recess and in Follow the wedge overhanging. In order to assist the adjustment of the sword on the chassis of the chain saw, preferably the recess in the wedge, as well as in the underlying area in the sword, should be designed as a longitudinal groove, in which a located on the chassis below the counter-holder elongated spring can engage.

In a special way, in this case the movement of the elements of the clamping lever assembly in the transition from the open position to the closed position designed such that the counter wedge slides over the wedge mounted on the sword and held by the anvil by means of contact pressure locks the sword on the chassis. At the same time thereby the sword is pushed longitudinally in the direction away from the drive pinion, so that the saw chain is tensioned.

Advantageously, the tensioning lever arrangement for tensioning the saw chain and locking the sword on the chassis comprises a lid, which can for example also be formed directly by that housing cover which covers the chain drive in the sawing operation. On the cover pivotally mounted on the chassis, a linkage is provided, by means of which the rotary movement of the cover is transformed into a longitudinal movement of a rod becomes. This rod in turn is in connection with a counter wedge and thus promotes its rotational and longitudinal movement.

If the cover is pivoted in the direction of the chain unit applied to the main body of the chain saw (towards the closed position of the tension lever arrangement), then in a first step the counter wedge is also pivoted onto the wedge mounted on the sword. Then realized via link and rod connection between the lid and counter-wedge causes a longitudinal displacement of the counter-wedge on the wedge. Here, the counter-wedge pushes under the mounted on the chassis, over the wedge on the sword standing out counterhold. This causes the counterwedge is pressed with increasing longitudinal displacement on the wedge. This ensures that transmits the longitudinal movement of the counter-wedge on the sword mounted on the wedge on the sword. At the same time, the pressing force acting perpendicularly on the chassis, which the counter-holder generates between the counter-wedge and the wedge, generates a locking of the chain unit on the main body of the chain saw. The pressing pressure between the wedge and counterwedge further causes a longitudinal displacement of the sword in the direction away from the drive pinion, so that the saw chain is tensioned.

In the event that, for improved adjustment of the sword, a spring formed on the chassis extends into a groove located in the wedge and sword in the omission, it is profitable to provide this spring with a slot in which the spacer in a Longitudinal displacement can penetrate unhindered.

In a possible variant of the first advantageous embodiment of the quick-release device according to the invention, the rod, by means of which the movement of the cover is transferred to the counter-wedge, with one or more Spring biased so that the spring force supports the longitudinal movement of the rod. Furthermore, the cooperation between cover and counter wedge can be profitably improved by introducing a movably mounted connecting web between the two components.

In an alternative variant of the first advantageous embodiment of the quick-release device according to the invention, the longitudinal movement of the rod, by means of which the rotational movement of the cover is transmitted to the counter-wedge, supported by a lever and / or a clamping mechanism.

In this case, the clamping mechanism can be configured such that it is actuated via a link connected to the lid of the tensioning lever assembly and acts on the connected to the counter-wedge rod. The clamping mechanism causes between the cover and rod adjusts a traction, which supports the transmission of the rotational movement of the lid in a linear movement of the rod. In this way, the counter-wedge is moved towards the wedge located on the sword, so that it locks with the main body of the chain saw and the saw chain is tensioned.

To release the locking of the sword on the chassis of the chain saw, the counter wedge is pulled by means of a longitudinal movement of the rod again from the wedge mounted on the sword. Here, the longitudinal movement of the rod is initially supported by acting between the lid and rod clamping mechanism. In the course of the rotation of the lid is transmitted by means of a movably mounted on this lever on the rod. Here, this lever exerts a compressive force on a stop attached to the rod, so that in this way also the rotational movement of the lid is transformed into a linear movement of the rod.

In order to improve the adhesion by means of the clamping mechanism, it is advisable to carry out the rod in the region in which it interacts with the clamping mechanism, advantageously with a non-slip, in particular corrugated surface. It is also conceivable to carry out the bar in a profitable manner, at least in the area of interaction with the clamping mechanism with an elliptical cross-section. Alternatively, according to a circular cross-section of the rod and the clamping mechanism can be designed such that there the cross section of the passage for the rod is performed elliptical.

Preferably, the lid of the clamping lever assembly is provided with a fastening element, by means of which it is automatically or manually fixed after completion of the locking and clamping operation on the chassis of the chain saw.

In a second advantageous refinement of the quick-action clamping device according to the invention, the counterwedge and a locking lever are mounted on the cover which is pivotably mounted on the chassis of the chain saw. In this case, the locking lever is pivotally mounted relative to the lid. To cooperate with this locking lever a locking pin is formed on the chassis. This locking pin extends in the region of the support surface and projects beyond this preferably perpendicular, approximately corresponding to the counter-holder in the previously described first advantageous embodiment of the quick-release device. In order to cooperate with the locking lever of the locking pin is provided in a profitable manner with a recess into which a preferably hook-shaped training can engage the locking lever. The interacting surfaces of locking lever and locking pin are to be designed so that upon pivoting of the locking lever in the locking position of the lid located on the counter wedge is pressed onto the wedge mounted on the sword. This acting on the chassis pressing pressure generated between the counter wedge and wedge, causes a locking of the chain unit to the main body of the chain saw. Furthermore, the pressing pressure causes a longitudinal displacement of the sword in the direction away from the drive pinion, so that the saw chain is tensioned.

In the cooperating with this embodiment of the quick-release device sword a spacer is mounted on the sword movable and is biased by means of springs in the direction of the drive pinion for the saw chain. The wedge cooperating with the counter wedge on the cover of the tensioning lever arrangement is fastened to the sword in a sliding manner. Advantageously, this wedge is so in connection with the spacer that when the spacer slides after opening the clamping lever assembly in the direction of the drive pinion, it is also pushed or pulled by the spacer in this direction. Alternatively, it would of course also conceivable to bias the wedge slidably mounted on the sword itself in the direction of the drive pinion with a spring force.

In order to cause the pressing pressure between the wedge and counter wedge in a thrust force on the sword away from the drive pinion when closing the clamping lever assembly, but at the same time to allow a shift of the wedge toward the drive pinion when opening the clamping lever assembly, wedge and sword are preferably on a micro-toothing in contact with each other. So it is conceivable to provide the resting on the sword bottom of the wedge with a micro-toothing. A corresponding micro-toothing is then applied along those longitudinal sections on the top of the sword, on which move the wedge can. The micro-toothing is designed so that the wedge with respect to the sword in only one direction along its longitudinal axis (this is when mounted sword in the direction of the drive pinion) can be moved.

If a chain unit or a sword is used with one of the embodiments of the quick-release device according to the invention, which has a spacer which is biased by spring forces from the sword in the direction of the drive pinion, it is advantageous if in this case the lid of the clamping lever assembly as well as on the sword located spacers are formed so that they cooperate such that upon completion of the locking and tensioning operation, when the lid on the wedge and the counter wedge lowers, the spacer is pushed on the sword against the spring force in the longitudinal direction away from the drive pinion. In this way, after the locking of the chain unit on the main body of the chain saw is no longer necessary connection between the drive pinion and spacer solved so that no frictional losses and wear occur during operation of the chainsaw.

Advantageously, for this purpose, the spacer is provided on its side opposite the contact surface of the drive pinion side with a wedge-shaped nose. To cooperate with this wedge-shaped nose, a likewise wedge-shaped counter-nose is formed on the lid. With the completion of the locking and clamping process thus nose and counter-nose act on each other so that the spacer is pushed on the sword against the spring force in the longitudinal direction away from the drive pinion.

In order to use a sword on which a spacer is movably mounted, even with a chainsaw, in which the drive pinion already mounted on the drive shaft before mounting the sword is, such a chainsaw to be provided with a stop for this spacer. In this case, the stop is to be designed such that the biased by spring force in the direction of the drive pinion spacer comes into contact with this stop before contacting the drive pinion. In this way, the spacer is protected during the assembly of the sword on the chassis of the chain saw from damage due to undefined running on the drive pinion or the drive shaft.

In order to facilitate the assembly of the chain unit to the main body, advantageously in the mounting area on the chassis to the support of the sword trained bearing surfaces can be carried out magnetically or provided with a magnet. In this way it is achieved that after hanging up the chain unit holds this automatically, so that the operator can operate the clamping lever assembly without simultaneous holding the chain unit.

With reference to the following figures possible, advantageous embodiments of the quick-release device according to the invention and the chain unit will be explained in detail. This show the FIGS. 3 to 9 the interaction of the chain unit according to the invention with the quick-release device according to the invention according to a first advantageous embodiment. The FIGS. 10 to 15 describe the alternative variant of this first advantageous embodiment of the quick-release device. A second advantageous embodiment of the quick-release device according to the invention is characterized by the FIGS. 16 to 23 described. The FIGS. 24 and 25 show the formation and effect of a stop for the spacer by way of example with reference to the embodiment according to the FIGS. 16 to 23 ,

Figur 1

schematisch eine an den Hauptkörper 1 einer Kettensäge montierte Ketteneinheit 4.

Figur 2

die Ketteneinheit 4, bestehend aus Schwert 7, Antriebsritzel 5 und Sägekette 8.

Figur 3

eine erste vorteilhafte Ausgestaltung der erfindungsgemäßen Schnellspanneinrichtung umfassend Chassis 21 mit Auflageflächen 23 und Gegenhalter 24, sowie Spannhebelanordnung 20 in geöffnetem Zustand.

Figur 4

die Verbindung zwischen Deckel 25 und Gegenkeil 26 über den Verbindungssteg 27, sowie die Kulisse 28 mit der Stange 29.

Figur 5

die auf das Chassis 21 aufgebrachte Ketteneinheit 4 nebst Spannhebelanordnung 20.

Figur 6 u. 7

das die Arretierung und die Kettenspannung bewirkende Zusammenwirken von Keil 10, Gegenkeil 26 und Gegenhalter 24 beim Schließen des Deckels 25.

Figur 8 u. 9

das Zusammenwirken der an dem Abstandhalter 11 und dem Deckel 25 ausgeformten Nasen 13, 40, welche die Trennung des Abstandhalters 11 vom Antriebsritzel 5 bewirken.

Figuren 10 bis 13

die Funktionsweise einer alternativen Variante zur ersten vorteilhaften Ausgestaltung der Schnellspanneinrichtung aus den Figuren 3 bis 9.

Figur 14

Details zur 3D-Kulisse 160 aus Figuren 10 bis 13.

Figur 15

Details zum Zusammenwirken von Klemmmechanismus 170, Stange 129 und Kulisse 160 im Rahmen der alternativen Variante aus Figuren 10 bis 13.

Figur 16

die Spannhebelanordnung einer zweiten vorteilhaften Ausgestaltung der erfindungsgemäßen Schnellspanneinrichtung.

Figuren 17 bis 19

eine alternative Ausgestaltung von erfindungsgemäßer Ketteneinheit und Schwert, insbesondere geeignet zum Zusammenwirken mit der Spannhebelanordnung aus Figur 16.

Figuren 20 bis 24

die Funktionsweise der zweiten alternativen Ausgestaltung der erfindungsgemäßen Schnellspanneinrichtung.

Figur 25

die Verbindung zwischen Keil 210 und Schwert 207 mittels der Mikroverzahnung 250.

Figuren 26 u. 27

die Ausbildung und Wirkung eines Anschlags für den Abstandhalter.

It shows

FIG. 1

schematically a mounted on the main body 1 of a chain saw chain unit 4th

FIG. 2

the chain unit 4, consisting of sword 7, drive pinion 5 and saw chain. 8

FIG. 3

a first advantageous embodiment of the quick-release device according to the invention comprising chassis 21 with bearing surfaces 23 and counter-holder 24, and clamping lever assembly 20 in the open state.

FIG. 4

the connection between the cover 25 and counterwedge 26 via the connecting web 27, and the link 28 with the rod 29th

FIG. 5

the applied to the chassis 21 chain unit 4 together with clamping lever assembly 20th

Figure 6 u. 7

the locking and the chain tension causing interaction of wedge 10, counter wedge 26 and counter-holder 24 when closing the lid 25th

Figure 8 u. 9

the interaction of the formed on the spacer 11 and the cover 25 lugs 13, 40, which cause the separation of the spacer 11 from the drive pinion 5.

FIGS. 10 to 13

the operation of an alternative variant to the first advantageous embodiment of the quick-release device from the FIGS. 3 to 9 ,

FIG. 14

Details on the 3D backdrop 160 off FIGS. 10 to 13 ,

FIG. 15

Details on the interaction of clamping mechanism 170, rod 129 and link 160 in the alternative variant FIGS. 10 to 13 ,

FIG. 16

the tensioning lever arrangement of a second advantageous embodiment of the quick-release device according to the invention.

FIGS. 17 to 19

an alternative embodiment of inventive chain unit and sword, in particular suitable for cooperation with the clamping lever assembly FIG. 16 ,

FIGS. 20 to 24

the operation of the second alternative embodiment of the quick-release device according to the invention.

FIG. 25

the connection between wedge 210 and sword 207 by means of the micro-toothing 250th

Figures 26 and. 27

the training and effect of a stop for the spacer.

The FIG. 1 shows by way of example and schematically the main body 1 of a chain saw with a drive unit (not shown) for driving a saw chain 8. The main body 1 is a handle 2 with a switch 3 for switching on and off of the drive unit. The main body 1 is shown without the housing cover covering the chain drive during operation, so that the chain unit 4 comprising the sword 7, the saw chain 8 and the drive pinion 5 is visible. The drive pinion 5 is connected via a drive shaft 6 to the drive unit for driving the saw chain 12. The mounted on the sword 7 wedge and the spacer are not shown in this schematic representation.

A possible advantageous embodiment of the chain unit 4 is in FIG. 2 demonstrated. For better visualization of the individual details of the chain unit 4, the representation of the saw chain 8 has only been outlined here. As usual, the saw chain 8 runs around the drive pinion 5 and the blade 7. For this reason and for reasons of clarity, the representation of the saw chain 8 is completely dispensed with in the following figures.

On the sword 7, a wedge 10 is mounted, which is preferably provided as shown here in the middle along its longitudinal extent with a recess 15. Furthermore, a spacer 11 is slidably mounted on the sword 7. This is braced with springs 12 against the wedge 10 in the direction of the drive pinion 5. In this way, the saw chain 8 is biased because the spacer 11 presses the drive pinion 5 against the sword 7 in the saw chain 8. The spacer 11 also extends into the space formed in the wedge 10 and has at its end a protruding upward from the wedge 10 nose 13. At least in the region of this intermediate space of the wedge 10, both the blade 7 and the spacer 11 have a recess 14, which preferably extends longitudinally along the entire gap.

The FIGS. 3 to 15 show by way of example an advantageous realization of a first advantageous embodiment of the quick-release device according to the invention. This shows the FIG. 3 one of these first alternative embodiment corresponding clamping lever assembly 20 in the open state. Extending from the chassis 21 of the main body 1 of the chain saw is a drive shaft 22 connected to its drive unit, onto which drive pinion 5 is applied during assembly of the chain unit 4 to the main body. Furthermore, bearing surfaces 23 are provided on the chassis, on which the Sword 7 of the chain unit 4 comes to rest when mounted on the main body 1. Preferably, in the region of these bearing surfaces 23, a counter-holder 24 is formed, which projects beyond the bearing surfaces 23 vertically. The counter-holder 24 penetrates during assembly of the chain unit 4 to the main body 1 in the region of the recess 14 both the sword 7 and the spacer 11 and the gap in the wedge 10. To assist the adjustment of the sword 7 is on the chassis 21 in the region of Support surfaces 23, a spring 50 is formed, which extends after application of the chain unit 4 between the omissions in wedge 10 and 7 sword. In order to avoid that this spring 50 hinders the longitudinal movement of the spacer 11, this is provided with a slot 51, in which the spacer 11 can penetrate unhindered in the context of a longitudinal displacement.

The function of the link 28 and the coupled thereto rod 29 for transmitting the resulting from the rotational movement of the lid 25 movement behavior on the counter-wedge 26 is clear from the cross-sectional drawing of Figure 4. On the cover 25, a gate holder 32 is mounted or formed, in which a movement transmitting the predetermined setting 28 is formed. On the rod 29, a holder for a sliding block 31 is mounted, which extends into the slot 28 and slides at a resulting from the rotation of the lid 25 change in position of the link holder 32 along the link 28 and so transmits the motion information to the rod 29. Preferably, the rod 29 is biased by a spring 30, so that a longitudinal displacement of the counter-wedge 26 against wedge 10 and counter-holder 24 is supported.

In the FIG. 5 the chain unit 4 inserted into the tensioning lever arrangement 20 can be seen in a preferred embodiment. As already described above, the drive pinion 5 is connected to the drive shaft 6. The counterpart 24 projects beyond the wedge 10 in the space formed thereon. In the left part of the figure, the lid 25 and the counter wedge 26 is shown, which are rotatably mounted and coupled via a link 28 and a rod 29 with each other. Furthermore, in the exemplary embodiment shown here, an additional coupling between cover 25 and counter wedge 26 is realized by means of a connecting web 27. By this coupling mechanisms, a rotational movement of the lid 25 is transmitted to both in a rotational movement of the counter-wedge 26 as well as in a longitudinal movement of the same.

This movement and the resulting interaction of counter-wedge 26 with the wedge 10 by means of the counter-holder 24 is subsequently by means of FIGS. 6 and 7 demonstrated.

In terms of in the FIG. 5 described situation was in the in FIG. 6 illustrated situation, the lid 25 already partially inclined in the direction of the wedge 10. As a result, the counterwedge 26 has already lowered to the wedge 10.

If the lid 25 is pivoted further, the results with the FIG. 7 described situation in which the counter-wedge 26 is already pressed by means of the counter-holder 24 by longitudinal movement on the wedge 10 on this. At the same time causes the longitudinal movement of the counter-wedge 26 and a rectified longitudinal force on the sword 7, so that the saw chain 8 is tensioned.

The FIGS. 8 and 9 show the decoupling between the spacer 11 and drive pinion 5 in the contact area 60 when the cover is fully closed. For this purpose, a wedge-shaped nose 13 is formed on the spacer 11 on its side opposite the contact surface of the drive pinion 5. Here, the running in the recess 15 of the wedge 10 Part of the spacer 11 to be provided with an omission 14 through which during the assembly of the chain unit 4 of the anvil 24 and possibly the spring 50 can penetrate. To cooperate with the wedge-shaped nose 13, a likewise wedge-shaped counter-nose 40 is formed on the lid 25. Upon completion of the locking and clamping operation, when the lid 25 lowers to the wedge 10 and the counterwedge 26, nose 13 and counter-nose 40 act on each other such that the spacer 11 on the sword 7 against the spring force in the longitudinal direction away from the drive pinion fifth is pushed. In this way, after the locking of the chain unit 4 on the main body of the chain saw is no longer necessary connection between the drive pinion 5 and spacer 11 is released.

The in the FIGS. 10 to 13 shown tension lever assembly 100 is an alternative with respect to the interaction of lid 125, rod 129 and counter-wedge 126 of the means of FIGS. 3 to 9 described advantageous first alternative embodiment of the quick-release device according to the invention.

This is in the FIGS. 10 and 11 the interaction of lid 125, rod 129 and counter wedge 126 in the final phase of opening the clamping lever assembly 100 is shown. The cover 125 is in this case provided with a lever arm 140 movably mounted thereon, which rests on the rod 129, preferably by means of a bias by a spring. When opening the clamping lever assembly 100, the contact point of the lever arm 140 moves on the rod 129 in the direction of a stop 141. Upon reaching the stop which acts of the lever 140 on the stop 141 compressive force causes a displacement of the rod 129 in the direction 130. By this shift is the coupled with the rod 129 counter wedge 126 against pushed the scenery 150 ( FIG. 10 ) and due to their stepped configuration tilted upwards ( FIG. 11 ).

The FIGS. 12 and 13 show the interaction of cover 125, rod 129 and counter wedge 126 when closing the clamping lever assembly 100. Here, the clamping lever assembly 100 is shown in the region of the lid 125, the lever 140 and the link 160 in a sectional view, so that guided on the guide rail 180 clamping device 170 becomes clearly visible. The clamping device 170 comprises two leg sections and surrounds the rod 129 in a region 128, wherein each of these two leg sections, preferably by means of sliding blocks attached thereto, in each case a slide track 161 a and 161 b of the guide 160 is performed.

In the FIGS. 14 a) and b) are the two side parts of the backdrop 160 and introduced therein slide tracks 161 a and 161 b shown. From the in the FIG. 14c) illustrated section through one of the side panels 160 is the varying in relation to the side surface depth profile (3D curve) of the slide tracks clearly. While in the upper region 162 of the backdrop the slide track runs close to the edge of the side part, the slide track dives deeper into the lower part 163 in the side part. This three-dimensional course of the slide track causes when moving the lid 125 of the clamping lever assembly 100 that the clamping device 170 connected to these slide tracks opens or closes.

This functionality is in the in the FIGS. 15 a) and b ) shown cuts through gate 160, rod 129, clamping device 170 and guide rail 180 illustrates. This shows the FIG. 15 a) a section with open clamping lever assembly. In this case, the leg sections of the clamping device 170 which are connected to the slide tracks are located in the For this reason, the clamping device 170 is in an open or extended state (indicated by the arrows in FIG. 15 a) , As a result, the clamping connection between the clamping device 170 and the rod 125 is released.

If the cover 125 is lowered in the direction of the sword 7, the leg sections of the clamping device 170 which are connected to the link 160 move along the slide tracks to their track sections 162 displaced to the edge. This leads to a jamming or a frictional connection between the clamping device 170 and rod 129, so that thereby the transformation of the rotational movement of the lid (125) can be supported in a linear movement of the rod 125.

In order to further improve the frictional connection between the clamping device 170 and the bar 129 caused by the jamming, in the case of the FIGS. 10 to 13 illustrated embodiment in the area 128, in which the rod 129 cooperates with the clamping device 170, executed with a non-slip, in particular fluted surface.

The FIGS. 16 to 23 describe by way of example an advantageous realization of an alternative second embodiment of the inventive quick-release device.

From the FIG. 16 It can be seen that in this advantageous embodiment, the clamping lever assembly as an essential element comprises a mounted from a pivotally mounted on the chassis of the chain saw cover 225 to which a counterwedge 226 and a locking lever 227 is mounted on the one hand. It may be at this cover 225 at the same time to the one Part of the outer casing of the chainsaw forming cover for drive shaft 222 and sword rest 223 act. The locking lever 227 is pivotally mounted relative to the cover 225. In this embodiment, the clamping lever assembly is dispensed with a complex mechanism for transforming the rotational movement of the lid 225 in a longitudinal movement of the counter-wedge. To cooperate with the locking lever 227, a locking pin 224 is formed on the chassis of the chain saw, which has an omission 228 for engagement with the locking lever 227.

The Figures 17 and 18 describe a chain unit according to the invention suitable for interacting with this tension lever arrangement. This chain unit consists on the one hand of a drive shaft 222 can be applied to the drive pinion 205, a saw chain 208 and a sword 207, on which a wedge 210 and a spacer 211 are mounted. In the FIG. 18 This chain unit is shown again with the omission of the wedge 210 in order to show the formation of the spring-biased spacer 211 more clearly. The spacer 211 is biased by two springs 212 relative to the sword 207 such that it is biased by the spring force in the direction of the drive pinion 205. At its end opposite to the drive pinion 205, a transverse element 216 is formed on the spacer 211. This cross member 216 engages behind the displaceably mounted on the sword 207 wedge 210 such that it is also pushed in a direction of the drive pinion 205 in a direction of the spacer 211 in this direction.

FIG. 19 shows a detail of the on the clamping lever assembly (off FIG. 16 ) mounted chain unit (off Figures 17 and 18 ). From the sectional view in FIG. 19 It will be seen how the spring 212 penetrates the wedge 210. Also Here is the taking place during assembly of the chain unit penetration of locking pin 224 by the chain unit can be seen.

The FIGS. 20 and 21 show the second inventive design quick release device in the open and almost closed state (the full locking means locking lever 227 is not done here). From the FIG. 21 It can be seen how already in the almost closed state of the quick-release device located on the cover 225 counter wedge 226 comes to rest on the wedge 210, and then exert the necessary pressing force 230 and sliding force 231 on the sword 207 with completion of the lock.

In the in the Figures 22 a) and 22 b ) shown by the clamping lever assembly, the interaction of locking lever 227 and locking pin 224 at the conclusion of the lock is shown (to better understand the operation, the chain unit has not been shown here). As can be seen from the figures, the pivoting of the locking lever 227 from an open to a closed position results in an engagement of a hook formed thereon into an aperture 228 in the locking pin 224.

This in the Figures 22 illustrated engagement and its effect on locking the sword 207 on the chassis of the chain saw and the simultaneous voltage of the saw chain 208 is connected to the sequence of FIGS. 23 a) - c) explained in more detail. These figures represent schematically the three essential steps in the locking of the quick-release device.

The with the FIG. 23 a) The situation shown corresponds essentially to the situation FIG. 21 , Here are the wedge 210 and the counterwedge 226 still easy on each other. If, in the following, the locking lever 227 is pressed downwards in the direction of the cover 225, its hook-shaped formation engages in the recess 228 in the locking pin 224 (FIG. FIG. 23 b) , The eccentric configuration of the hook-shaped recess, when penetrating into the recess 228, causes an increasing pressing of the counterwedge 226 on the wedge 210, so that both a pressing pressure 230 and a sliding pressure 231 are exerted on the blade 207 connected to the wedge 210. This causes, after complete locking of the quick-release device ( FIG. 23 c) the sword 207 locked by the pressing pressure 230 fixed to the chassis and the saw chain 208 is tensioned by the sliding pressure 231.

Like from the FIG. 24 As can be seen, when locking the quick-release device formed on the cover 225 wedge-shaped nose 240 lowers on a corresponding location on the spacer 211 mounted counter-nose 213, whereby with the completion of the locking operation of the spacer 211 against the force applied by the springs 212 spring force away from the drive pinion 205 is pushed. If the locking is released again later and the cover 225 is raised, the nose 240 releases the counter-nose 213 again, so that the spacer 211 is pushed back again in the direction of the drive pinion 205 by the spring force. At the same time, the spacer 211 also pushes the wedge 210 back in the direction of the drive pinion 205 via its transverse element 216.

So that on the wedge 210 on the one hand, the sliding pressure in a direction away from the drive pinion 205 can be transmitted to the sword 207, but on the other hand, the wedge 210 can be moved by means of the spacer 211 when opening the lid 225 back toward the drive pinion 205 is in the connecting area between wedge 210 and sword 207 a Micro-toothing formed as in the FIG. 25 shown. In this illustration, the spacer 211 is not shown, and also the wedge 210 is only partially shown to show the lower surface of the sword 207 can. Like from the FIG. 23 As can be seen, the region of the sword 207, on which the wedge 210 can move, is provided with a micro-toothing which cooperates with a corresponding on the opposite surface of the wedge 210 corresponding micro-toothing 250 together. In a conceivable embodiment, this micro-toothing 250 is realized with a sawtooth-like structure, wherein the structure applied to the surface of the sword is formed by a plurality of sawtooth-shaped elevations. In this case, the elevations on the drive pinion 205 side facing a steep, in particular vertical edge, while they are running on the side facing away from the drive pinion 205 side with low pitch.

In the FIG. 26 is shown using the example of a quick-release device according to the second alternative embodiment, a chassis of a chain saw, in which the drive pinion 305 is fixedly mounted on the drive shaft. In order to be able to use such a chain saw and a sword according to the invention, on which a spacer 311 is movably mounted, a stop 300 for this spacer 311 is provided on the chassis. The FIG. 27 shows a sword 307 according to the invention applied to this type of chain saw. As can be seen from the figure, in this case the spacer 311 comes into contact with the stop 300. A contact with the drive pinion 305 and thus possibly accompanying damage to the spacer 311 can thereby be effectively avoided.

Claims (20)

1. Chainsaw comprising a quick-tensioning device, a blade, a drive pinion, and a drive unit for driving a saw chain that runs over the blade and the drive pinion,
   wherein the drive pinion (5) is connected to the drive unit via a drive shaft (6),
   wherein the blade (7) is mounted in a slidable manner on a supporting surface (23) on the chassis (21) of the main body (1) of the chain saw,
   wherein a wedge (10) is mounted on the blade,
   wherein a movable tensioning lever arrangement (20) comprising a mating wedge (26) is mounted on the chassis (21) in the region of the drive shaft (6),
   wherein the tensioning lever arrangement (20) comprises a cover mounted pivotably on the chassis, said cover having on the one hand an open position in which at least the saw chain (8) and the blade (7) can be removed from the main body (1) of the chainsaw, and on the other hand a closed position in which the saw chain (8) bears in a tensioned manner on the drive pinion (5) and the blade (7) and the blade (7) is firmly fixed to the chassis (21) of the main body (1),
   and wherein the movement sequence of the elements of the tensioning lever arrangement (20) at the transition from the open position to the closed position is designed such that the mating wedge (26) comes to rest over the wedge (10),
   such that, by means of contact pressure, the blade (7) is fixed on the chassis (21) and at the same time the blade is slid along in the direction away from the drive pinion (5) by means of sliding force such that the saw chain (8) is tensioned.
2. Chainsaw according to Claim 1, characterized in that a mating holder (24) is mounted in the region of the supporting surface of the blade (7), wherein this mating holder (24) is configured to interact with the mating wedge (26),
   such that the contact and sliding pressure between the mating wedge (26) and wedge (10) is generated with the aid of a mating holder (24) in that the latter prevents the mating wedge (26) from yielding counter to the contact pressure.
3. Chainsaw according to Claim 2, characterized in that a slotted guide is attached to the cover, the rotary movement of the cover being transformed by means of said slotted guide into a longitudinal movement of a rod connected to the mating wedge, such that said rod promotes a rotary and longitudinal movement of the mating wedge.
4. Chainsaw according to Claim 3, characterized in that the rod is pretensioned by means of at least one spring such that the longitudinal movement of the rod is supported by the spring force.
5. Chainsaw according to either of Claims 3 and 4, characterized in that a movably mounted connecting bar is fitted between the cover and mating wedge.
6. Chainsaw according to one of Claims 3 to 5, characterized in that it comprises a clamping mechanism which actuates the slotted guide connected to the cover of the tensioning lever arrangement and acts on the rod connected to the mating wedge.
7. Chainsaw according to Claim 6, characterized in that the rod is embodied with a nonslip, in particular ribbed surface in the region in which it interacts with the clamping mechanism.
8. Chainsaw according to either of Claims 6 and 7, characterized in that the rod is embodied with an elliptical cross section in the region of the engagement of the clamping mechanism,
   or in that, in the case of a circular cross section of the rod, the clamping mechanism is designed such that the cross section of the passage for the rod is embodied in an elliptical manner at that location.
9. Chainsaw according to one of Claims 3 to 8, characterized in that a lever is fastened in a movable manner to the cover of the tensioning lever arrangement, said lever acting, during the opening of the cover, on a stop fastened to the rod and thereby transforming the rotary movement of the cover into a linear movement of the rod.
10. Chainsaw according to one of Claims 2 to 9, characterized in that the cover of the tensioning lever arrangement is provided with a fastening element by means of which it is fastened automatically or manually following the fixing of the blade and the tensioning of the saw chain.
11. Chainsaw according to Claim 1, characterized in that the mating wedge (226) is connected to the cover (225) in order to cover the drive pinion (205) and that end of the blade (207) located in the vicinity thereof, and in particular is formed thereon or fastened thereto,
    and in that this cover (225), when interacting with a locking device (224, 227), generates the opposing force on the mating wedge (226) such that the mating wedge (26) is prevented from yielding counter to the contact pressure.
12. Chainsaw according to Claim 11, characterized in that the locking device is formed by a locking lever mounted pivotably on the cover and by a locking pin formed on the chassis of the chainsaw, wherein in particular the locking pin is provided with a cutout into which the locking lever can engage, in particular by means of a hook-like configuration.
13. Chainsaw according to one of the preceding claims, characterized in that the cover of the tensioning lever arrangement and a spacer located on the blade are configured, in particular by the cover and the spacer being offset by a lug and mating lug interacting therewith,
    such that they interact in such a way that at the end of the fixing and tensioning operation the spacer is slid away from the drive pinion in the longitudinal direction on the blade.
14. Chainsaw according to one of the preceding claims, characterized in that a stop is formed on the chassis of the chainsaw in the vicinity of the drive pinion, a spacer which is mounted on the blade and is pretensioned in the direction of the drive pinion coming into abutment against said stop.
15. Chainsaw according to one of the preceding claims, characterized in that the drive shaft and the drive pinion are configured such that the drive pinion, as part of a chain unit, can be mounted on the drive shaft during the mounting of this chain unit on the chassis of the chainsaw.
16. Chainsaw according to one of the preceding claims, characterized in that the supporting surfaces, formed in the mounting region of the chassis in order to support the blade, are embodied in a magnetic manner or are provided with a magnet.
17. Chainsaw according to one of Claims 1 to 16, wherein the saw chain runs in a guide groove, wherein a spacer (11) is mounted in a slidable manner on the blade (7),
    wherein the spacer (11) is pretensioned in the direction of the drive pinion (5) with respect to the wedge (10) by means of springs (12), wherein, starting from the springs (12), the spacer (11) exerts a force on the drive pinion (5) such that the latter is pushed counter to the blade (7) into the saw chain (8).
18. Chainsaw according to Claim 17, characterized in that the wedge is mounted in a slidable manner along the longitudinal axis of the blade,
    wherein a spring force acts on the wedge such that, during the opening of the tensioning lever arrangement of the quick-tensioning device, the wedge is slid on the blade in the direction of that end of the blade that is adjacent to the drive pinion.
19. Chainsaw according to Claim 18, characterized in that the wedge is connected to the blade via micro-serrations, to which end in particular the underside, resting on the blade, of the wedge is provided with micro-serrations which interact with micro-serrations on the longitudinal portion of the blade, the wedge moving on said microserrations,
    wherein the micro-serrations are configured such that the wedge can be moved with respect to the blade only in the direction towards that end of the blade that is adjacent to the drive pinion.
20. Chainsaw according to either of Claims 18 and 19, characterized in that, with the wedge mounted on the blade, preferably the central part and also in a corresponding manner the region, located therebeneath, of the blade are cut out in particular in the form of a longitudinal groove, such that when the chain unit is applied to the supporting surface, a spring, supporting the adjustment of the blade, can pass through this cutout.

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