DE4332988A1 - Hand-held implement - Google Patents

Description

The invention relates to a hand-held implement with a their tool unit, a drive motor, a housing and with a grip device, which consists of a front grip part and a rear grip part.

Hand-held tools with a front tool unit and a drive motor, a housing and a handle device has long been known in practice, especially chainsaws, Cutters or hedge trimmers. The handle device that the Handling such devices, mostly consists of a vorde and a rear handle section for two-handed operation guarantee. The front handle part is usually used for guidance and to hold the device in very different positions must be brought, such as. B. chainsaws to cut off branches a felled tree according to the location of the tree, while the rear handle mostly also controls device functions enables.

A corresponding working device is known from EP 0 267 472 B1, the one front tool unit, a drive motor, a housing and a handle assembly comprising a front handle member and a rear handle part. The front handle part is as Bow handle executed, the con about a longitudinal axis of the implement is pivotable during operation, so that the poss Chen handle positions on a semicircle around the implement. The bow handle here has an annular approach that the Grips around the housing and is received in a groove that is around the Stretches around. The bow handle is continuously under Rei Exercise resistance swiveling. The rear handle part is in the shape of a Handle executed, which is rotatable about a longitudinal axis of the handle Stigt, which is at an angle relative to the pivot axis of the Bow handle extends, the angle is less than 90 °. The The front part of the handle can be swiveled and the back can be turned tere handle part allow the implement regardless of Arm position of the operator in a with respect to a longitudinal axis of the Ar  to lead any position.

However, this known tool has the disadvantage that the Aligning the implement with respect to a workpiece in ver different heights and locations above the ground for an unfavorable body positions and postures of the user, on the other hand often extreme deflections of the hand arm system, especially in the hands direct, conditionally. The distance between the front handle and the rear Handle part is not variable, so the user is forced to to bend down sharply when working at floor level, when working at hip or chest height no optimal angular position of the elbow joints can be taken.

In contrast, it is an object of the present invention to work device of the type specified in the preamble of claim 1 form that it is an operator regardless of the work situation of the implement is possible, an ergonomically favorable and thus to take a relaxed posture and posture, while doing extreme to avoid deflections and twists of the hand arm system and to keep and operate the implement safely and safely.

This object is achieved in that the front Handle part on an upper side of the implement several in the longitudinal direction device has spaced gripping points.

This arrangement leads to the advantage that on the one hand when working on So the user does not have to bend down as much, for Ar the hands should be at a good distance at the waist or chest can take each other, resulting in a favorable angle position of the elbow joints optimally transfers the force to the device can be worn. In addition, secure access is possible Lich, since the front handle part is fixed relative to the implement, d. H. is not mounted rotatable or displaceable, so that an increased Ensure safety when the implement hits or jams is accomplished. Furthermore, more efficient work is possible because dynami gripping allows continuous work, so no breaks are necessary for handle adjustment.  

The front handle part expediently also has a left-hand one and / or right side of the implement at least one gripping point on. Since it is often necessary to tilt the implement by 90 ° in order to e.g. B. make horizontal cuts with a chainsaw illuminates this gripping point, which in this case is above the center of gravity tes of the implement comes to rest, one of tilting moments around the free hand holding and guiding the implement tes.

An advantageous embodiment of the implement according to the invention is given in that the front handle part on the top of the Tool from cross struts, which have the gripping points, and there is at least one longitudinal strut, preferably two opposite lying longitudinal struts between which the cross struts are arranged and to which these are attached. This is a simple and Cost-effective design of the front handle part guaranteed.

It is also advantageous if the front handle part at least a front lateral strut, which has the gripping point, and at least least has a rear lateral strut. Especially when two on the left and right side of the implement against each other Overlying front lateral struts on the top of the implement tes connected to the longitudinal struts and / or a cross strut and the underside of the implement with a connecting strut and are attached to the housing, and if a rear lateral strut be one of the two longitudinal struts supported on the housing, the front Lateral struts together with the rear lateral strut, the longitudinal and the cross struts form a lattice-like lattice frame. The La teral struts on the left and right side of the implement possible, on the one hand, the machining direction of the implement such as B. in a horizontal cut with a chainsaw on the other hand, the use for left and right-handers is the same ensured. The grid-like grip frame allows thanks of its many gripping points for the user, easy and safe to move around fen to keep the working tool in the required working condition position and to hold and guide with little effort ren.  

In the event that the implement is in a tilted position will, d. H. that the originally left and right side of the Arbeitsge advises to come up or down, it is particularly advantageous that the longitudinal struts between at least two cross struts are concave are bulging. So it is possible to connect the two longitudinal struts with the konka venous bulge on the upper body or stomach and thereby support the implement with the body. This ensures a particularly safe and stable holding and guiding of the implement.

An inexpensive and particularly simple embodiment of the implement tes is given by the fact that the cross struts are formed straight and are arranged at right angles to a longitudinal axis of the device. On the one hand the cross struts can be manufactured economically, on the other hand due to their symmetrical arrangement with regard to the device longitudinal axis gripped by right-handed and left-handed people alike become.

A curved configuration of the is ergonomically particularly favorable Cross struts together with a symmetrical arrangement of this cover Lich a device longitudinal axis. This will make the ulnar abduction d. H. outward deflections of the wrist, both for Lefties as well as righties reduced.

Another ergonomically favorable and easy to manufacture version is given in that the cross struts are angled in a V-shape and are arranged symmetrically to a device longitudinal axis. More preferred these cross struts are at an angle of approx. 75 ° to the device angled along the longitudinal axis so that ulnare, d. H. outward facing Wrist deflections, for both left and right manual operators are largely avoided.

A particularly advantageous embodiment is furthermore thereby ben that the cross struts are detachably connected to the longitudinal struts, preferably if for each of these cross struts on the longitudinal struts ben several spaced attachment points are provided. So can On the one hand, the distances between the individual cross struts are individual duel to be adapted to the operator, on the other hand, the Cross struts suitable for both left and right-handers  tends to be attached to a device longitudinal axis.

It is still special with regard to this last embodiment favorable that the cross struts are telescopically adjustable in length. In addition to the advantages already mentioned, this results in the possibility of the inclination of the cross struts with respect to the device's longitudinal axis adapt individually to the operator.

To in the event that the implement is tilted, i. H. that the ur originally left and right side of the implement above and below comes to rest, the volar ulnars, d. H. down and out To minimize deflection of the wrist, it is beyond from favorable that the front lateral struts inclined to a device are arranged along the longitudinal axis. The angle to the longitudinal axis of the device is preferably about 65 °, for ergonomically convenient access enable.

Another advantageous embodiment of the implement is thereby given that the front handle part is integrated into the housing. There The handle device is particularly light, which creates a force saving handling of the implement becomes possible. The separate ones Gripping points along a top of the device or on one or Both sides of the same are then through corresponding recesses of the housing itself.

Furthermore, according to a preferred embodiment, the Er Find the tool in conjunction with the rear handle part Control element for controlling device functions and at least one fixed handle section, the control element relative to the fixed handle portion rotatable about a longitudinal axis thereof is stored. This can result in a tilting of the implement Longitudinal axis is a strong dorsal, i.e. H. facing inwards or downwards Deflection of the wrist can be avoided as the hand that does that rear grip part detected, in this way in any angular position of the Ar device can effortlessly grasp and operate the control element. The fixed handle section therefore ensures safe at all times Res and firm access as well as holding and guiding the implement, so that an unintentional tilting of the implement along one implement  axis is avoided.

In a further advantageous embodiment, the control element mounted on a rotating sleeve and forms a rotationally movable with this Chen handle section, wherein the rotating sleeve preferably to a front ren end of the fixed handle portion adjacent and coaxial this is. This allows the hand to control the control element particularly easily turn with you and operate effortlessly in any position without the easy-to-use guidance and handling of the implement by the operator servant is impaired.

The implement is advantageously designed such that the control element an eccentric lever with a protruding control is cam and that the control element is perpendicular to a pivot axis is pivotable to the longitudinal axis. This allows the control element can be easily handled by index finger or thumb, whereby by the above control cams the rotational movement of the controls tes in a translatory movement to control device function is converted.

Another advantage results from the fact that a clutch device between fixed handle section and rotating handle Section is arranged, preferably formed from an axial Clutch bearing and a stationary or rotating friction disc preferably with at least one pair of friction surfaces and / or a ver pair of teeth. On the one hand, this makes it possible for the moment that for the Dre hung of the rotatable handle section is necessary to defined make sure that the rotating Handle section its position not unintentionally due to vibrations of the Ar beitsgerätes changed.

The invention is described below using exemplary embodiments and associated drawings explained in more detail. In these show:

Fig. 1 is a side view of a working apparatus according to a first embodiment of the invention in a schematic representation,

Fig. 2 is a plan view of the implement of FIG. 1 in a schematic representation,

Fig. 3 is a front view of the implement of FIG. 1 in a schematic representation,

Fig. 4 is an enlarged side view of a front handle portion of the implement of FIG. 1,

Fig. 5 is an enlarged front view of the front handle portion of Fig. 4,

Fig. 6 is an enlarged plan view of the front handle portion of Fig. 4 and 5,

Fig. 7 is a perspective view of the implement with Be dienungsperson in a side view, wherein the working device is handled in a low height in the vertical position,

Fig. 8 wherein the working device is guided around the hips of the operator is a perspective view similar to FIG. 7,

Fig. 9 is a perspective view similar to FIGS. 7 and 8, wherein the working device is held at chest height of the operator,

Fig. 10 is a perspective view, similar to that shown in FIGS. 7 to 9, wherein the working device is held in a horizontal posi tion and is abge supported in the abdominal area of the operator,

Fig. 11 is a plan view of the implement according to a further example from execution of the front grip member having straight, left-handed inclined transverse struts mounted in schemati shear representation,

Fig. 12 is a plan view of the power tool, similar to that in Fig. 11, with straight, inclined for right-mounted cross members of the front handle part,

Fig. 13 is a plan view of the working machine, similar to those in Fig. 11 and 12 with arc-shaped cross members of the front handle part in a schematic representation;

Fig. 14 is a plan view of the working machine, similar to those in FIGS. 11 to 13, with V-shaped angled cross struts of the front handle part in a schematic representation;

Fig. 15 is a plan view of the working machine, similar to those in FIGS. 11 to 14, with only one longitudinal strut and a V-shaped abge angled cross struts of the front handle part in schemati shear representation,

Fig. 16 is a plan view of the working machine, similar to those length-adjustable cross members of the front handle portion in a schematic depicting lung in FIGS. 11 to 15, attached with releasable

Fig. 17 is a plan view of the working machine, similar to those in FIGS. 11 to 16, fastened with detachable, adjustable cross struts of the front handle part in an arrangement for left-handed in a schematic representation;

Fig. 18 is a plan view of the working machine, similar to those in FIGS. 11 to 17, fastened with detachable, adjustable cross struts of the front handle part in an arrangement for right-handed in a schematic representation;

Fig. 19 is an enlarged sectional view of a length-adjustable cross member of the front handle portion of Fig. 18 in schemati shear representation,

Fig. 20 is an enlarged, perspective view of a rear handle portion of the implement of FIG. 1,

FIG. 21 shows an illustration, like FIG. 20, with an operator's hand that partially encompasses the rear handle

Fig. 22 is a longitudinal section through the rear handle of the Arbeitsge device according to Figs. 20 and 21 in an actuated state of an operating element in a schematic representation, and

Fig. 23 is an enlarged cross-sectional view of a rotationally movable handle portion of the rear handle part with the operating element according to Fig. 22 in a schematic representation.

Fig. 1 shows a schematic side view of a grinder 1 with a front, the cutting wheel 2 rotatably supporting tool unit, a housing 3 with a gasoline engine not shown here as a driving source of the grinder 1 as well as with a handle device 5 , which consists of a front handle part 6th and a rear handle part 7 . The front handle part 6 is primarily used to hold and guide the power grinder 1 , that is, to support the weight of the power grinder 1 by an operator, while the rear handle part 7 in addition to its task to allow reliable two-hand operation of the power grinder, also to control motor functions , in particular the speed control, is used by operating devices explained in more detail below.

In order to enable the operator, depending on the work task and the resulting spatial position of the grinder 1 , also depending on the physique of the operator to be determined kinematic conditions in the handling of the grinder 1 to allow optimal handling, points the front grip part 6 at the top of cut-off machine 1 a plurality of spaced in the direction of the longitudinal axis of the power cutter 1 gripping points 8, which can be realized in this case by three crosspieces 12th

In this way, it is possible to operate the power cutter 1 independently of the work task, essentially free of ulnar abduction, and thus to avoid long-term health problems, particularly in the wrist area of the operator, and to enable fatigue-free working. The hand that holds the power grinder 1 on the front handle part 6 and depending on the size of the operator, the job and the spatial position of the power grinder 1 engages either on the front, middle or rear cross strut 12 as a handle 8 , in this way kept essentially free of volar or dorsal loading regardless of the work task and spatial position of the power cutter 1 and can also take a position during the work process essentially in extension of the lower arm of the operator.

In the area of the front handle 8 are on both sides of the grinder 1 , preferably connected to a circumferential frame, as shown in Fig. 3, hen front lateral struts 10 , which are part of the front handle part 6 and also form gripping points 8 and preferably with the Housing 3 are the verbun. A rear lateral strut 9 , which preferably does not form a gripping point, serves for the force-transmitting connection of the front handle part 6 to the housing 3 .

Fig. 2 shows schematically the grinder 1 from above in plan view, the position and arrangement of the cross struts 12 to form upper, in the longitudinal direction of the grinder 1 be spaced gripping points 8 is particularly well visible. The obe ren gripping points 8 are formed on the upper side of the grinder 1 by the three cross struts 12 , which are preferably connected in one piece by the oppositely arranged longitudinal struts 13 , these longitudinal struts 13 optionally also for supporting the grinder 1 on the body of the operator can serve or can also be used for the hand attack of an operator.

The front lateral struts 10 extend from the connec tion point of the front cross strut 12 and the opposite longitudinal struts 13 inclined vertically downwards to the longitudinal axis of the cut-off machine 1 , as can be seen from FIG. 1.

Fig. 3 shows a front view of the cut-off machine, in which the integral structure of the front lateral struts 10 with the front upper cross strut 12 can be seen, the lateral struts 10 also along an underside of the housing 3 with one another, preferably while supporting the weight of the front tool unit of the Cut-off machine 1 and the housing 3 and the internals in this be sensitive are connected by a connecting strut 14 . The rear lateral strut 9 , which has no function as a gripping point, is connected on the right side of the grinder 1 to one of the longitudinal struts 13 at the top of the separating grinder 1 and serves to support the front handle part 6 on the housing 3 .

Fig. 4 shows the front handle part 6 in an enlarged side view. The longitudinal struts 13 are concavely curved between the rear and mitt lere transverse strut 12 . This facilitates an adaptation to the body when the cut-off machine 1 is supported on the body of the operator. The lateral strut 9 is fastened to one of the longitudinal struts 13 between the rear and central cross strut and supports the longitudinal strut obliquely downwards and backwards on the housing 3 . The front lateral strut 10 is connected to the longitudinal struts 13 and the foremost of the cross struts 12 and forms with the front lateral strut 10 on the opposite side of the cut-off machine 1 a closed by the connecting strut 14 ge ( Fig. 5) or open strut train ( Fig. 6). In this way, the rear lateral strut 9 , the front late ralstreben 10 together with the longitudinal struts 13 and the cross struts 12 and the connecting strut 14 are connected to a grid-like, integra len grip frame.

In Figs. 7 to 10 show various operating positions are shown in the handling of the power cutter. 1 While FIGS. 7 to 9 each show vertical sections and a vertical working position of the cut-off wheel 2 , FIG. 10 illustrates a horizontal working position, the attack taking place at a gripping point 8 of the lateral struts 10 . From the illustrations, it is easy to see that, due to the possibility of different gripping positions at different gripping points 8 on the top of the power cutter 1 or laterally for the attack of the left hand (for right-handers) or the right hand (for left-handers) dern) and for the handling of the grinder 1 select that both ulnar abduction and dorsal extensions of the left or right hand of the operator when attacking one of the gripping points 8 are practically avoided and the hand even in different working positions in essentially extends in a straight line extension of the forearm of the operator.

FIGS. 11 and 12 show further advantageous embodiments for the front grip part 6 at the top of the power cutter. 1 The cross struts 12 are in this case formed as straight struts, but inclined to the longitudinal axis of the power cutter 1, in a parallel arrangement to one another, the handle design shown in FIG. 11 with asymmetrically angled gripping points 8 to reduce or avoid ulnar abduction of the hand for left-handers is.

Fig. 12 is similar to the above-explained two plan views of a preferred embodiment for the arrangement of the cross members 12 with asymmetrically angled gripping surfaces 8 for reducing or avoiding ulnar abduction in right-handed.

Fig. 13 shows a further embodiment for the upper gripping points 8 of the front handle part 6 , here the cross struts 12 are arcuate and symmetrical to the longitudinal axis of the device between the two opposing longitudinal struts 13 are arranged. Such a design of the front handle part on the top of the cut-off machine 1 is equally good for avoiding ulnar abduction in right- and left-handers.

In Figs. 14 and 15, further embodiments are shown for shaping the upper gripping portions 8 of the front handle part 6, in which case each transverse rod 12 forms two symmetric abge angled gripping surfaces 8 and such a handle design also for the prevention or reduction of ulnar abduction at Links - and right-handed is suitable. In the embodiment of FIG. 15, the gripping surfaces 8 are also formed as a V-shaped abge angled cross members 12 which are arranged symmetrically with the longitudinal axis of the device, wherein in contrast to the execution form of Fig. 14, the gripping portions 8 not ge between the two genüberliegenden longitudinal struts 13 are arranged, but in the embodiment of FIG. 15, the cross struts 12 angled to a central in the longitudinal direction of the cut-off machine 1 he stretching longitudinal strut 13 are attached and extend herringbone angled to both sides from this.

Fig. 16 shows an embodiment in which the cross struts 12 between the opposite longitudinal struts 13 on the top of the front handle part 6 are in turn adjustable, where in the longitudinal struts 13 grouped together each have several re, mutually adjacent fastening points 25 with which the opposite ends of a cross strut can be connected as desired. As a result, the Querstre ben 12 can also be mounted parallel to each other at different distances, on the other hand, as shown in the Ausführungsbeispie len according to FIGS . 17 and 18, at different angles to the longitudinal axis of the device with the longitudinal struts 13 fixed, but exchangeable bar. With the individual grip elements formed in this way, individual adjustment of the respective gripping point 8 is possible to a large extent by the different positioning of the cross struts 12 , both for right-handers and for left-handers.

A longitudinal section through such a telescopic length-adjustable cross strut 12 is shown in Fig. 19. Between the BEFE stigungsstellen at the opposite ends of the cross strut 12 , this is formed from a sleeve-shaped part 12 a, in which a return spring 4 is arranged, and an engagement part 12 b, which has a length compensation section 12 c. The BEFE stigung the cross struts 12 on the longitudinal struts 13 can each by screws or z. B. socket pins.

In Figs. 20 and 21, the back tere handle part 7 is shown the handle device 5 in a perspective view, the rear handle part as an operating element for a speed control of the power cutter 1 7 has an eccentric lever 15, the bond in United having a rotating sleeve 17 as a rotationally movable handle portion 18 is arranged adjacent to a the essential part of the rear handle part 7 forming fixed handle portion 16 . The rotary sleeve 17 with the eccentric lever 15 is rotatably mounted about a longitudinal axis of the fixed handle portion 16 (or a parallel axis thereto) at the front end of the fixed Griffabschnit 16 or in a central region thereof. Here it is possible that the essential for the speed control eccentric lever 7 by the operator always in an optima len, ie relative to the fixed handle section depending on the speed of the working position rotated position and can be actuated so that the right hand the operator is kept essentially free of dorsal extensions and overall a much more comfortable handling of the separator 1 is possible.

In Fig. 22, the rear handle part 7 is shown in an enlarged longitudinal section. The rotatable handle portion 18 , which is formed by the rotary sleeve 17 and the eccentric lever 15 , is preferably rotatably supported by means of a coupling device 19 to the fixed handle portion 16 and coaxially with this. The coupling device 19 makes it possible to give the rotary sleeve 17 a steadfastness in the respective angular position, so that it does not rotate inadvertently. The coupling device 19 can consist of an axial clutch bearing 20 and a friction disc 21 in engagement with the end faces of the fixed handle portion 16 and the rotatable Griffab section, ie the rotary sleeve 17 . The eccentric lever 15 is shown in Fig. 22 in its actuated, a front linkage 23 for speed control of the gasoline engine of the power grinder 1 in the longitudinal actuating state. The eccentric lever 15 can be pivoted about a pivot axis 23 extending perpendicular to the axis of rotation of the rotating sleeve 17 and has a control cam 24 on its front for longitudinal actuation of the linkage 23 .

In a further exemplary embodiment, in which the rotary sleeve 17 is mounted in a starting position pretensioned in the circumferential direction on the fixed handle section 16 , FIG. 23 shows an enlarged cross section through the rotary sleeve 17 in the region of its coupling connection to the fixed handle section 16 . Here on the pivot axis 20 of the rotary sleeve 17 a Spi ralfeder 11 is added, the one hand with radial legs on a fixed, with the fixed handle portion 16 verbun which stop pin 26 and with its other leg on a rotatable with the rotating sleeve 17 stop pin 27 . Fig. 23 shows the rotary sleeve 17 in its maximum twisted state, which is determined by the engagement of the pin 27 in an engagement groove 28 which extends over an angle of 180 °, so that when the eccentric lever 15 is released, the one shown in FIG ., the rotary sleeve 90 is 23 ° back to the right-oriented leg of the return spring 11, located to the rotatable stop pin 27 is substantially below the fixed pin 26.

Due to the combined, deflection of the wrist as far as possible avoiding design of the front and rear handle parts 6 , 7 of the handle device 5 , much better handling of the cut-off machine 1 and less fatigue are possible with such a working device.

Claims (22)

1. Hand-held implement with a front tool unit, a drive motor, a housing and with a handle device, which consists of a front handle part and a rear handle part, characterized in that the front handle part ( 6 ) on an upper side of the implement ( 1 ) several in Has longitudinally spaced gripping points ( 8 ). 2. Tool according to claim 1, characterized in that the front handle part ( 6 ) on a left and / or right side of the implement ( 1 ) has at least one gripping point ( 8 ). 3. Tool according to one of claims 1 or 2, characterized in that the front handle part ( 6 ) on the top of the implement ( 1 ) from cross struts ( 12 ) having the gripping points ( 8 ), and at least one longitudinal strut ( 13 ) exists. 4. Tool according to claim 3, characterized in that the cross struts ( 12 ) between two opposite longitudinal struts ( 13 ) are arranged and attached to both longitudinal struts ( 13 ). 5. Tool according to at least one of claims 1 to 4, characterized in that the front handle part ( 6 ) has at least one front lateral strut ( 10 ) with a gripping point ( 8 ) and at least one tere lateral strut ( 9 ). 6. Tool according to claim 5, characterized in that two on the left and right side of the implement ( 1 ) against each other opposite front lateral struts ( 10 ) on the top of the Ar beitsgerätes ( 1 ) with the longitudinal struts ( 13 ) and / or one Cross strut ( 12 ) connected and on the underside of the implement ( 1 ) with a connecting strut ( 14 ) and attached to the housing ( 3 ), and that the rear lateral strut ( 9 ) one of two longitudinal struts ( 13 ) on the housing ( 3 ) supports, the front lateral struts ( 10 ) together with the rear lateral strut ( 9 ), the longitudinal and the cross struts ( 12 , 13 ) form a grid-like grip frame. 7. Tool according to at least one of claims 3 to 6, characterized in that the longitudinal struts ( 13 ) between at least two cross struts ( 12 ) are concavely curved. 8. Tool according to at least one of claims 3 to 7, characterized in that the cross struts ( 12 ) are straight and are arranged at right angles to a longitudinal axis of the device. 9. Tool according to at least one of claims 3 to 7, characterized in that the cross struts ( 12 ) are formed straight and arranged inclined to a longitudinal axis of the device. 10. Tool according to at least one of claims 3 to 7, characterized in that the cross struts ( 12 ) are arcuate and arranged symmetrically to a longitudinal axis of the device. 11. Tool according to at least one of claims 3 to 7, characterized in that the cross struts ( 12 ) angled V-shaped and are arranged symmetrically to a longitudinal axis of the device. 12. Tool according to at least one of claims 3 to 7, characterized in that the cross struts ( 12 ) are detachably connected to the longitudinal struts ( 13 ). 13. Tool according to claim 12, characterized in that the longitudinal struts ( 13 ) for each cross strut ( 12 ) have a plurality of spaced fastening points ( 25 ). 14. Tool according to at least one of claims 12 or 13, characterized in that the cross struts ( 12 ) are telescopically adjustable in length. 15. Tool according to at least one of claims 3 to 14, characterized in that the front lateral struts ( 10 ) are arranged inclined to a longitudinal axis of the device. 16. Tool according to at least one of claims 1 or 2, characterized in that the front handle part ( 6 ) in the housing ( 4 ) is integrated. 17. Tool according to at least one of claims 1 to 16, characterized in that the rear handle part ( 7 ) has an operating element ( 15 ) for controlling device functions and at least one fixed handle section ( 16 ), the operating element ( 15 ) relative to the fixed handle portion ( 16 ) is rotatably mounted about a longitudinal axis thereof. 18. Tool according to claim 17, characterized in that the control element ( 15 ) is mounted on a rotary sleeve ( 17 ) and forms a rotatable handle portion ( 16 ) with the water. 19. Tool according to at least one of claims 17 or 18, characterized in that the rotating sleeve ( 17 ) is adjacent to a front end of the fixed handle portion ( 16 ) and be. 20. Tool according to at least one of claims 17 to 19, characterized in that the control element ( 15 ) is an eccentric lever ( 23 ) with a projecting control cam ( 24 ). 21. Tool according to at least one of claims 17 to 20, characterized in that the control element ( 15 ) is pivotable about a pivot axis perpendicular to the longitudinal axis. 22. Tool according to at least one of claims 17 to 21, characterized in that a coupling device ( 19 ) between the fixed handle portion ( 16 ) and rotatable handle portion ( 18 ) is arranged and from an axial clutch bearing ( 20 ) and at least one friction surface pair ( 21 ) and / or a pair of teeth ( 22 ) is formed.