HAND-GUIDED WORK TOOL WITH A GUIDE TUBE

Description

[0001] The invention relates to a hand-held work device of the type specified in the preamble of claim 1.

[0002] From DE 10 2014 006 910 A1, a working device is known which has a first operating element, namely a throttle lever, and a second operating element for actuating a safety locking mechanism. The second operating element is rotatable about an axis that lies parallel to the longitudinal center axis of the guide tube and is arranged above it. It is supported by an approximately semicircular guide element.

[0003] EP 2 875 904 B1 discloses a switching device for garden equipment comprising a speed control element, a slider, a locking control element, and a blocking element pivotally mounted on the locking control element. The pivot axes of the locking control element and the blocking element are parallel to each other.

[0004] CN 112470737 A discloses a work device with a control element and a pivotally mounted locking lever.

[0005] The invention is based on the objective of providing a hand-held work device that has an advantageous design.

[0006] For this purpose, it is provided that the second control element is pivotably mounted about a second pivot axis and the holding element is pivotably mounted about a fourth pivot axis, and that the second pivot axis lies in a plane that runs perpendicular to the fourth pivot axis.

[0007] The arrangement of the second pivot axis in a plane perpendicular to the fourth pivot axis is an inventive concept independent of the arrangement of the pivot bearings of the second control element. The arrangement of the second pivot axis in a plane perpendicular to the fourth pivot axis is also advantageous for work equipment in which the second control element is not mounted with two pivot bearings arranged on opposite sides of a central plane and / or for work equipment whose second control element does not have an opening through which the guide tube projects.

[0008] The second pivot axis of the second control element and the fourth pivot axis of the holding element are therefore not parallel to each other. Advantageously, the second pivot axis lies in a plane that contains the longitudinal center axis of the guide tube. Particularly preferably, the second and fourth pivot axes are at an angle of 90° to each other when viewed in the direction of the longitudinal center axis. The second and fourth pivot axes can intersect, particularly at an angle of 90°, or be spaced apart from each other. The fourth pivot axis preferably runs parallel to the first pivot axis of the first control element and to the third pivot axis of the third control element.Because the second pivot axis and the fourth pivot axis are not parallel to each other, the forces introduced by the second control element into the holding element can be effectively introduced into the housing of the working device and only partially act in the direction of actuation of the holding element.

[0009] In particular, the working device comprises a guide tube on which a tool unit with the at least one tool is arranged, wherein the at least one handle is arranged on the guide tube, the handle enclosing the guide tube, the first pivot axis being transverse to a longitudinal center axis of the guide tube, the guide tube having a median plane which contains a longitudinal center axis of the guide tube and which is aligned parallel to the first pivot axis, the first control element projecting from the handle on a first side of the median plane, the second control element being pivotably mounted on a first pivot bearing and a second pivot bearing, the first pivot bearing being arranged on the first side of the median plane and the second pivot bearing being arranged on an opposite, second side of the median plane, and the second control element having an opening through which the guide tube projects.

[0010] In particular, the second control element is pivotally mounted on a first pivot bearing and a second pivot bearing. The two pivot bearings are arranged on opposite sides of a central plane. The central plane is aligned parallel to the first pivot axis of the first control element and contains the longitudinal center axis of the guide tube. The control element has an opening through which the guide tube protrudes. The control element thus encompasses the guide tube. This allows for an inclination of the second pivot axis relative to the longitudinal center axis of the guide tube, while maintaining a simple and compact design. This enables ergonomic operation.

[0011] An advantageous design results when the second control element extends over an angle of at least 180°, preferably over an angle of at least 270°, around the longitudinal center axis of the guide tube. An angle of at least 270° is particularly advantageous when the second control element has at least three operating sections at which an operator can actuate the second control element. Most preferably, the second control element extends over the entire circumference of the guide tube, i.e., over 360° around the longitudinal center axis. This allows for a high degree of stability of the second control element to be achieved easily.

[0012] Ergonomic operation can be achieved if, when viewed in a direction parallel to the first pivot axis of the first control element, the second pivot axis of the second control element is inclined to the longitudinal center axis of the guide tube by an angle of 5° to 85°. Advantageously, the angle at which the second pivot axis is inclined to the longitudinal center axis of the guide tube in the viewing direction parallel to the first pivot axis is 10° to 60°, particularly 15° to 45°, and most preferably 20° to 30°.

[0013] The second control element is preferably operated by the operator with their thumb. This operation is preferably performed while the operator's hand at least partially encloses the handle, including the guide tube. Due to the angle of inclination of the second pivot axis relative to the longitudinal center axis, the actuation movement of the second control element can be approximated to the ergonomic movement of the thumb around the operator's thumb joint, resulting in ergonomic operation.

[0014] Preferably, the second pivot axis intersects the longitudinal center axis of the guide tube. Advantageously, the second pivot axis and the longitudinal center axis of the guide tube are coincidentally aligned when viewed perpendicular to the center plane.

[0015] Advantageously, the second control element is part of a locking device that prevents unintentional activation of the first control element. Advantageously, in its unactivated position, the second control element locks the first control element from moving towards an activated position. The second control element advantageously locks the first control element mechanically. In particular, the second control element locks the first control element directly. Preferably, in its unactivated position, the second control element lies within the pivot path of the first control element. When the second control element is in its unactivated position, the first control element cannot be activated and the drive motor cannot be started.

[0016] Because the first pivot bearing of the second control element and the first control element are arranged on the same side of the center plane, the locking force exerted by the first control element on the second control element when the first control element is actuated while the second control element is not actuated can be directly introduced into the first pivot bearing.

[0017] Advantageously, the handle has a transverse plane that runs perpendicular to the longitudinal center axis in a region of the handle located away from the first operating element. Preferably, the transverse plane runs in a region where the operator's little finger is to be positioned. The first pivot bearing is advantageously located at a greater distance from the transverse plane than the second pivot bearing. Advantageously, the first pivot axis is located at a distance from the transverse plane that is less than the distance of the first pivot bearing to the transverse plane. Advantageously, the second pivot bearing and the first pivot axis of the first operating element are arranged at approximately the same distance from the transverse plane.

[0018] To enable ergonomic operation for both right- and left-handed users, the second control element is designed to pivot from its unactuated position in one direction to a first release position and in the opposite direction to a second release position. This allows the second control element to be operated ergonomically with either the thumb of the right or left hand. Advantageously, the second control element has multiple actuation sections, so that the operator can grasp an actuation section of the second control element regardless of the position of the tool.

[0019] The second control element is advantageously spring-mounted. The spring advantageously pre-tensions the second control element into the unactuated position. In an advantageous embodiment, the spring is a torsion spring or leg spring, which is supported with both legs against both the housing and the second control element. This is particularly advantageous if the second control element can be pivoted in two opposite directions into a first and a second release position. By using a leg spring, a pre-tension from both release positions can be achieved with a single spring.

[0020] Advantageously, both legs of the torsion spring are supported by the same housing part. If the torsion spring is supported by both legs on different housing parts, positional tolerances can occur between the housing parts, resulting in different actuation and return forces for the two pivot directions. By supporting both legs on the same housing part, positional tolerances between the supports of the legs can be minimized.

[0021] Advantageously, a third control element is mounted on the handle so that it can pivot about a third axis. It can be provided that the third control element is part of a locking device, and that when the third control element is in the unactuated state, the first or second control element cannot be actuated.

[0022] In a preferred alternative design, the third control element serves to hold the second control element in its release position. In this design, the third control element advantageously does not form part of a locking device. To actuate the first control element and to start the drive motor, the third control element advantageously does not need to be actuated. If the third control element serves to hold the second control element in its release position, the operator does not need to continuously hold the second control element in the actuated position.

[0023] Advantageously, the third control element is arranged on the second side of the central plane. The first and third control elements are preferably arranged on opposite sides of the central plane. This allows the operator to operate the first control element with the index finger and the third control element with the palm of one hand. With this arrangement, the operator can keep the third control element continuously activated with minimal effort.

[0024] Advantageously, the third pivot axis has a smaller distance to the transverse plane than the first pivot axis. In particular, the third pivot axis has a smaller distance to the transverse plane than the second pivot bearing.

[0025] Advantageously, the third pivot axis runs parallel to the first pivot axis. In a particularly preferred design, the third pivot axis passes through the second pivot bearing. However, it is also possible for the third pivot axis to run at a distance from the second pivot bearing.

[0026] Advantageously, the device has means that hold the second control element in its release position as long as the third control element is in its actuated position. This means that the second control element only needs to be actuated to start the drive motor and can then be held in its actuated position by the third control element.

[0027] A simple design is achieved when the work tool has a holding element upon which the third control element acts, and which holds the second control element in its release position as long as the third control element is in its actuated position. Because the third control element does not act directly on the second control element, but rather via a holding element, the movements of the third and second control elements can be decoupled. The holding element can be positioned to ensure optimal force transmission to the second control element, while the third control element can be positioned for ergonomic operation and holding by the operator.

[0028] In a particularly preferred design, the third control element acts on the holding element via a spring. The spring allows the third control element to be actuated while the second control element is not yet actuated. The spring can pre-tension the holding element so that it moves into its holding position as soon as the second control element is moved to its release position. The spring allows the second and third control elements to be actuated in any sequence. This enables ergonomic and simple operation.

[0029] Preferably, the retaining element is pivotally mounted about a fourth pivot axis. This fourth pivot axis runs parallel to the third pivot axis. This allows for a favorable force distribution and efficient force transmission into the housing of the working tool. Bearing forces on the retaining element can be reduced. Other arrangements of the fourth pivot axis may also be advantageous. It is also possible for the retaining element itself to be designed as a spring.

[0030] Exemplary embodiments of the invention are explained below with reference to the drawing. The drawing shows: Fig. 1 a schematic representation of an operator with a hand-held tool, Fig. 2 a perspective view of the area of ​​a tool housing with a handle, Fig. 3 a perspective view of the handle, with one front housing half of the handle removed so that the internal elements are visible, Fig. 4 a longitudinal section through the handle, Fig. 5 a perspective view of the operating elements and the holding element of the handle, Fig. 6 an exploded view of the arrangement made of Fig. 3 , Fig. 7 a representation of the arrangement made of Fig. 5 , wherein the second control element is shown in its unactuated position and its two actuated positions, Fig. 8 a sectional view through the arrangement made of Fig. 7 in the unactivated position of the second control element, Fig. 8a a partially enlarged view from Fig. 8 , Fig. 9 a sectional view accordingly Fig. 8 with the second control element in an actuated position, Figs. 10 to 12 illustrations accordingly Figs. 3 to 5 , with the third control element being actuated, Figs. 13 to 15 illustrations accordingly Figs. 3 to 5 , with the second and third control elements activated, Figs. 16 to 18 illustrations accordingly Figs. 3 to 5 , wherein the first, second and third operating elements are actuated, Fig. 19 a sectional view of an alternative embodiment of the handle of the work tool with unactuated operating elements, Fig. 20 a sectional view of the handle made of Fig. 19 , wherein the second and third operating elements are actuated, Fig. 21 a sectional view of a further embodiment of the handle of the hand-held tool, Fig. 22 a perspective view of a further embodiment of a handle of a hand-held tool, Fig. 23 a schematic sectional view of the handle made of Fig. 22With the controls unactivated, Fig. 24 shows a perspective view of the second control element of the handle. Fig. 22 , Fig. 25 a schematic sectional view of the handle made of Fig. 22 With the controls activated, Figs. 26 to 28 show perspective views of parts of the handle in the position of the controls according to Fig. 25 , Fig. 29 a section through the handle in the area of ​​the first bearing pin of the second control element, Fig. 30 a side view of the second control element.

[0031] Fig. 1Figure 1 schematically shows a handheld tool 1, which is held by an operator. The tool 1 has a guide tube 2, which carries a tool unit 3 at its free end. In the exemplary embodiment, the tool 1 is a brush cutter. However, the tool 1 can also be another handheld tool, in particular a tool with a guide tube, such as a pole pruner, long-shafted hedge trimmer, or the like. The tool unit 3 comprises a tool 23, in the exemplary embodiment a trimmer line. The tool unit 3 can also include a gearbox and / or a drive motor. In the exemplary embodiment, a schematically depicted drive motor 4 is arranged at the end of the guide tube 2 facing away from the tool unit 3. Another arrangement of the drive motor 4, for example on the tool unit 3, may also be advantageous.

[0032] In the exemplary embodiment, a handle 5 and a loop handle 6 are arranged on the guide tube 2. Instead of the loop handle 6, another handle can also be provided. The handle 5 encloses the guide tube 2. The guide tube 2 has a longitudinal center axis 7.

[0033] Fig. 2 Figure 1 shows an embodiment of a battery-powered work device 1, namely a brush cutter. Fig. 2 The guide tube 2 is shown in section. The handle 5 is part of a housing 46. The housing 46 can be fitted with, for example, a [missing information] Fig. 1 The drive motor 4 is shown schematically. In the exemplary embodiment according to Fig. 2 The housing 46 is designed to accommodate a battery or accumulator.

[0034] In the exemplary embodiment, the handle 5 is integrally formed with the housing 46. The housing 46, in this embodiment, is constructed from two housing half-shells 67 and 68, which are divided parallel to the longitudinal center axis 7 of the guide tube 2. The handle 5 forms a grip section 47, which the operator can grasp with their hand. The guide tube 2 is guided through the grip section 47. The handle 5 can preferably also be formed separately from the housing 46.

[0035] On the handle 5, a first control element 11, a second control element 12, and a third control element 13 are arranged so that they can be gripped by the operator. The first control element 11 and the second control element 12 are arranged adjacent to the handle section 47. In the exemplary embodiment, the third control element 13 protrudes from the handle section 47. The second control element 12 has several control sections, of which in Fig. 2A first operating section 35 and a second operating section 36 are shown. A third operating section 37 is shown in Fig. 6 As shown. Adjacent to the second control element 12, a carrying eyelet 27 is arranged on the housing 46, into which a carrying strap can be attached.

[0036] The housing 46 forms a handle housing 70, on which the handle 5 is formed and in which the operating elements 11, 12 and 13 are mounted.

[0037] In Fig. 3 The second housing half-shell 68 is not shown, so that the guide tube 2, which is guided through the handle section 47, is visible. How Fig. 3 As shown, the first control element 11 is pivotally mounted about a first pivot axis 14. The third control element 13 is pivotally mounted about a third pivot axis 16. The third pivot axis 16 is advantageously parallel to the first pivot axis 14.

[0038] The third control element 13 is coupled to a retaining element 24. Advantageously, the third control element 13 is coupled to the retaining element 24 via a spring 29. In the exemplary embodiment, the retaining element 24 is designed as a pivotable lever. The retaining element 24 is pivotably mounted about a fourth pivot axis 25. In the exemplary embodiment, the fourth pivot axis 25 runs parallel to the third pivot axis 16. Advantageously, the fourth pivot axis 25 runs parallel to the first pivot axis 14.

[0039] In the exemplary embodiment, the second control element 12 surrounds the guide tube 2. Advantageously, the second control element 12 can be returned to an unactuated position 20 by a spring 38. The second control element 12 is held by the spring 38 in the direction of its position in the Figs. 3 to 5 The unactuated position 20 shown is pre-tensioned. In the exemplary embodiment, the spring 38 is a torsion spring, whose two legs 81 and 82 ( Fig. 7) rest against the second control element 12 and the housing 47. How Fig. 6 As shown, the handle housing 70 has a recess 57 for the spring 38.

[0040] The second operating element 12 has a first bearing pin 33 and a second bearing pin 34 for storage.

[0041] How Fig. 4As shown, the first bearing pin 33 projects into a receptacle 60 of the handle housing 70 and forms a first pivot bearing 17 with it. The second bearing pin 34 is mounted in a receptacle 61 of the handle housing 70 and forms a second pivot bearing 18 with it. A different design of the pivot bearings 17 and 18 may also be advantageous. In particular, bearing pins 33 and 34 can be formed on the handle housing 70 that engage in receptacles 60 and 61 of the second operating element 12. The second operating element 12 is pivotally mounted on the two pivot bearings 17 and 18 about a second pivot axis 15. When viewed in the direction of the first pivot axis 14, the second pivot axis 15 is inclined at an angle α to the longitudinal center axis 7 of the guide tube 2. The second pivot axis 15 therefore does not run parallel to the longitudinal center axis 7. The angle α is advantageously from 5° to 85°, in particular from 10° to 60°, preferably from 15° to 45°, and most preferably from 20° to 30°.In the exemplary embodiment, an angle α of approximately 25° is provided. This allows for an ergonomic direction of movement of the second control element 12 when actuated. As the . Figs. 3 and 5 As shown, the second control element 12 has an opening 19 through which the guide tube 2 projects. In the exemplary embodiment, the second control element 12 surrounds the guide tube 2 over its entire circumference. The second control element 12 thus extends over an angle of 360° around the longitudinal center axis 7. Preferably, the second control element 12 surrounds the guide tube 2 over at least 180°, and in particular at least 270°, of the circumference of the guide tube 2. Advantageously, the second control element 12 extends over an angle of at least 180°, and in particular at least 270°, around the longitudinal center axis 7 of the guide tube 2. Advantageously, the second control element 12 extends over the aforementioned angular range around the guide tube 2.

[0042] How Fig. 4As shown, in the exemplary embodiment, the second pivot axis 15 intersects the longitudinal center axis 7. The longitudinal center axis 7 lies in a median plane 8. The median plane 8 runs parallel to the first pivot axis 14 of the first control element 11. The first pivot bearing 17 is arranged on a first side 9 of the median plane 8. In the exemplary embodiment, the first pivot bearing 17 and the first control element 11 are located on the same side 9 of the median plane 8. The second pivot bearing 18 is arranged on the opposite, second side 10 of the median plane 8. In the exemplary embodiment, the third control element 13 and the retaining element 24 are also arranged on the second side 10 of the median plane 8. The retaining element 24 can engage the second control element 12 on either the first side 9 or the second side 10 of the median plane 8. Preferably, the retaining element 24 engages the second control element 12 on the second side 10 of the median plane 8.

[0043] In the usual working position of the tool 1, the first side 9 is advantageously located below the central plane 8 and the second side 10 is advantageously located above the central plane 8. The first operating element 11 is preferably arranged below the guide tube 2 in the usual working position of the tool 1 and the third operating element 13 above the guide tube 2. The second operating element 12 projects from the handle housing 70 on the second side 10 of the central plane 8.

[0044] The handle 5 has a transverse plane 26 that runs perpendicular to the longitudinal center axis 7 of the guide tube 2. The transverse plane 26 advantageously intersects the handle section 47 in an area where, in a normal hand position, a user's little finger is located. The first pivot axis 14 of the first control element 11, both pivot bearings 33 and 34 of the second control element 12, and the third pivot axis 16 of the third control element 13 are arranged on the same side of the transverse plane 26. The fourth pivot axis 25 of the retaining element 24 is also arranged on the same side of the transverse plane 26 as the pivot axes 14 and 16 of the control elements 11 and 13 and the pivot bearings 33 and 34 of the second control element 12.

[0045] How Fig. 4As shown, the first pivot axis 14 of the first control element 11 has a distance a from the transverse plane 26. The third pivot axis 16 of the third control element 13 has a distance b from the transverse plane 26. The first pivot bearing 33 of the second control element 12 has a distance c from the transverse plane 26. The second pivot bearing 34 of the second control element 12 has a distance d from the transverse plane 26. The fourth pivot axis 25 of the retaining element 24 has a distance e from the transverse plane 26.

[0046] The distance d of the second pivot bearing 34 to the transverse plane 26 is greater than the distance c of the first pivot bearing 33 to the transverse plane 26. The first pivot bearing 33 is therefore further away from the transverse plane 26 than the second pivot bearing 34. With respect to the hand of a user at the handle section 47, the second pivot axis 15 is inclined forwards and downwards.

[0047] The distance a of the first pivot axis 14 of the first control element 11 to the transverse plane 26 is smaller than the distance c of the first pivot bearing 33 of the second control element 12 to the transverse plane 26. The distance a of the first pivot bearing 14 of the first control element 11 to the transverse plane 26 corresponds approximately to the distance d of the second pivot bearing 34 of the second control element 12 to the transverse plane 26.

[0048] The distance b of the third pivot axis 16 of the third control element 13 is less than the distance d of the second pivot bearing 34 of the second control element 12 to the transverse plane 26. The distance e of the fourth pivot axis 25 of the holding element 24 is greater than the distance d of the second pivot bearing 34 of the second control element 12 to the transverse plane 26. The distance e of the fourth pivot axis 25 of the holding element 24 is greater than the distance b of the third pivot axis 16 of the third control element 13 to the transverse plane 26.

[0049] The locking device 30 and the first pivot bearing 33 of the second operating element 12 are arranged approximately on a line that runs parallel to the longitudinal center axis 7 of the guide tube 2. Because the locking device 30 and the first pivot bearing 33 are arranged on the same side of the center plane 8 and, in particular, also at approximately the same distance from the center plane 8, a force exerted by the operator on the locking device 30 in the locked position 32 with the first operating element 11 can be transmitted as a pressure force directly into the handle housing 70 via the first pivot bearing 33.

[0050] A switch 48 is provided for commissioning the drive motor 4. In the exemplary embodiment, the switch 48 is arranged on the first side 9 of the central plane 8. The first operating element 11 has an actuating section 66 which actuates the switch 48 when the first operating element 11 is in the actuated position. This is shown in the Figures 16 to 18The signal generated at switch 48 is used to control the drive motor 4. Switch 48 is advantageously a potentiometer.

[0051] The Figs. 3 to 5 The first control element 11 is shown in its unactuated position 42. The second control element 12 is arranged in its unactuated position 20, and the third control element 13 in its unactuated position 44. The second control element 12 forms a locking device 30 for the first control element 11. In the Figs. 3 to 5 In the unactuated position 20 of the second control element 12 shown, the locking device 30 is in its locked position 32. The second control element 12 is in the pivot path of the first control element 11. When moving towards its actuated position, the first control element 11 abuts the second control element 12 and therefore cannot move in the direction of arrow 76 ( Figs. 3 and 5 ) be moved into its activated position, as to Fig. 6This will be explained further.

[0052] As the Figs. 3 to 5 As shown, the third control element 13 preferably acts on the holding element 24 via the spring 29. The third control element 13 can be actuated by the operator in the direction of an arrow 77, which points in Fig. 5 The spring 29 rests with its first end 54 against a receptacle 56 of the third control element 13. If the second control element 12 is in its unactuated position 20, the third control element 13 can still be actuated. The actuated position 45 of the third control element 13 is shown in the Figs. 10 to 12 As shown. Actuation of the third control element 13 while the second control element 12 is in the unactuated position 20 causes the retaining element 24 to pivot until it rests against the second control element 12. Further actuation of the third control element 13 leads to elastic deformation of the spring 29, as the retaining element 24 can no longer move.

[0053] The exploded view in Fig. 6 Figure 1 shows the design of the operating elements 11 to 13 and their mounting in the handle housing 70 in detail. A bearing pin 58 is provided on the handle housing 70 for the pivotable mounting of the third operating element 13. How Fig. 6 As also shown, the spring 29 has a second end 55 which is supported on the retaining element 24. The retaining element 24 also has a retaining section 41 which is designed to engage with the second operating element 12. Fig. 6Three operating sections 35, 36, and 37 of the second operating element 12, as well as the opening 19 for the guide tube 2, are also visible. The two operating sections 36 and 37 are arranged approximately opposite each other. The first operating section 35 is located on the circumference between the second operating section 36 and the third operating section 37. The operating sections 35 to 37 preferably point approximately radially outwards and can, for example, enclose an angle of approximately 90°. A different number and / or arrangement of operating sections 35, 36, and 37 may also be advantageous. In particular, a second operating element 12 with two operating sections constitutes an advantageous alternative embodiment.

[0054] How Fig. 6As also shown, the second control element 12 has a locking section 62, which forms part of the locking device 30. A locking area 63 is formed on the first control element 11, which, when the second control element 12 is not actuated, comes into contact with the locking section 62, thus preventing the first control element 11 from moving into its actuated position 43. The first control element 11 is preferably biased by a spring 39 towards its unactuated position 42.

[0055] In Fig. 6 The receptacles 60 and 61 on the handle housing 70 for the bearing pins 33 and 34 of the second control element 12 are also visible. The handle housing 70 also has a bearing pin 59 for the retaining element 24. The retaining section 41 extends from a bearing section 64 of the retaining element 24, which is to be arranged on the bearing pin 59, towards the third control element 13.

[0056] When the third control element 13 is actuated, it deflects the first end 54 of the spring 29 approximately radially outwards relative to the guide tube 2. This also pre-tensions the retaining section 41 radially outwards. The second control element 12 surrounds the retaining element 24 on its outer circumference, so that the retaining element 24 is pressed against the second control element 12. Alternatively, the retaining element 24 may interact with the control element 12 at a different location.

[0057] How Fig. 7 As shown schematically, the second control element 12 can be pivoted from its central unactuated position in a first pivoting direction 49 to a first actuated position 21 and in a second, opposite pivoting direction 50 to a second actuated position 22. Fig. 7All three positions of the second control element 12 are shown in one illustration. The actuated positions 21 and 22 are so-called release positions, in which the first control element 11 is not locked by the second control element 12. In the actuated positions 21 and 22, the locking section 62 is not within the pivot range of the locking area 63. The pivot directions 49 and 50 are also shown in Fig. 8 marked.

[0058] Fig. 8 The second control element 12 and the holding element 24 are shown in the unactivated position 20 of the second control element 12. How Fig. 8As shown, the retaining element 24 projects into the opening 19 of the second operating element 12. The second operating element 12 advantageously has an inwardly projecting projection 40. The retaining section 41 of the retaining element 24 is arranged opposite the projection 40 and can, particularly when the third operating element 13 is actuated, bear against an end face 53 of the projection 40. The second pivot axis 15 lies in a plane 28. The plane 28 is perpendicular to the fourth pivot axis 25. In the exemplary embodiment, the plane 28 contains the longitudinal center axis 7 of the guide tube 2 and the second pivot axis 15 of the second operating element 12. It can also be provided that the plane 28 runs parallel to the longitudinal center axis 7 and at a distance from the longitudinal center axis 7. As the Figures 7 and 8 As shown, the fourth pivot axis 25 and the second pivot axis 15 do not run parallel to each other.

[0059] How Fig. 8aAs shown, the retaining element 24 has an end face 73 on its retaining section 41, which is designed to abut the end face 53 of the projection 40. The projection 40 also has contact surfaces 51 and 52, which are inclined towards the plane 28. The retaining element 24 has a first contact surface 71, which, in the first actuated position 21 of the second operating element 12, can come into contact with the first contact surface 51 on the projection 40. On the opposite side, the retaining element 24 has a second contact surface 72, which, in the second actuated position 22, can come into contact with the second contact surface 52. The contact surfaces 71 and 72 each form an angle β with the central plane 29, which tapers towards the end face 73. The angle β is chosen such that no self-locking can occur between the retaining element 24 and the second operating element 12. The angle β is advantageously 5° to 40°; in particular 20° to 30°.An angle β of approximately 25° is considered particularly advantageous.

[0060] Fig. 9 Figure 1 shows the arrangement when the second control element 12 is actuated. The second control element 12 is in its second actuated position 22. The contact surfaces 52 and 72 are in contact with each other. The contact surface 72 of the retaining element 24 is located in the pivot path of the projection 40 in the direction of the unactuated position 20 of the second control element 12. This prevents the second control element 12 from pivoting back to its unactuated position 20, but rather holds it in the actuated position 22 by the retaining element 24.

[0061] Due to the inclined position of the mounting surface 72, the force exerted by the second control element 12 towards its unactuated position 20 is resolved into a comparatively large force component acting parallel to the fourth pivot axis 25, and a significantly smaller force component acting towards the longitudinal center axis 7. Due to the angle β ( Fig. 8a The radially inward force component acting on the retaining element 24 is small, and the retaining element 24 can be held in its position even by a comparatively weak spring 29. The forces exerted by the second operating element 12 can be transmitted via the bearing section 64 ( Figs. 6 and 7 The forces are well channeled into the handle housing 70, resulting in a stable design. It is advantageous if the projection 40, into which the retaining element 24 engages, is arranged radially as far away as possible from the second pivot axis 15.

[0062] In the Figs. 8 and 9The barrier section 62 of the barrier device 30 is also visible.

[0063] In the Figs. 10 to 12 The first control element 11 is in its unactuated position 42 and the second control element 12 is in its unactuated position 20. The third control element 13 was positioned opposite the one shown in the Figs. 3 to 5 The handle 5 pivots from its unactuated position 44 and is now in its actuated position 45. In this position, the third operating element 13 rests against the outer circumference of the handle 5. In the exemplary embodiment, a recess 65 is provided on the handle 5 in which the third operating element 13 lies, resulting in a comfortable outer contour of the handle 5. The recess 65 is also in Fig. 6 As shown. Due to the pivoting of the third control element 13, the spring 29 was pre-tensioned. The retaining element 24 rests against the projection 40 of the second control element 12.

[0064] The Figs. 13 to 15Figure 1 shows the arrangement after the second control element 12 has been pivoted into its second actuated position 22. A corresponding arrangement results when the second control element 12 is pivoted into its first actuated position 21. The projection 40 has moved circumferentially to the longitudinal center axis 7, so that the retaining element 24 could pivot radially outwards. The retaining element 24 is positioned as shown in Figure 1. Fig. 9 and Fig. 15 shown at the second contact surface 52 of the projection 40. This prevents the second control element 12 from returning to its unactuated position 20 ( Figs. 10 to 12 ) sway.

[0065] The operator can first actuate the third control element 13 and then the second control element 12. Alternatively, the operator can also actuate the second control element 12 first and then the third control element 13. The operating sequence can be freely chosen by the operator due to the spring 29. After both control elements 12 and 13 have reached their actuated positions 45 and 21 or 22, the operator can release the second control element 12. The second control element 12 is held in the actuated position 21 or 22 by the third control element 13 via the spring 29 and the retaining element 24.

[0066] In the Figs. 16 to 18 The first control element 11 is also in its actuated position 43. When the second control element 12 pivots into its second actuated position 22, the locking section 62 ( Fig. 15 ) swiveled out of the swivel range of the locking area 63 of the first control element 11. This is in the Figs. 16 to 18visible. Accordingly, the locking section 62 pivots in the opposite direction out of the pivoting range 63 of the first control element 11 when the second control element is pivoted into its first actuated position 21. The locking device 30 is in its release position 31. The first control element 11 actuates a switch 48 and thus engages the drive motor 4 ( Fig. 1 ) in operation. In the exemplary embodiment, the first control element 11 has an actuating section 66 which acts on the switch 48.

[0067] The locking area 63 of the first control element 11 lies within the pivoting area of ​​the locking section 62 of the second control element 12. As a result, the second control element 12 cannot pivot back to its unactuated position 20 as long as the first control element 11 is actuated. The second control element 12 is also held in its actuated position 22, 21 by the retaining element 24, which rests against the projection 40 with one of its contact surfaces 71, 72. As soon as the operator releases the third control element 13 and the first control element 11, the retaining element 24 pivots back to its initial position due to the force of the spring 29.

[0068] The Figs. 19 and 20 An alternative embodiment is shown in which the third control element 13 acts on the holding element 24 via a spring 29 designed as a leaf spring. The second control element 12, in this embodiment, is shown as follows: Figs. 19 and 20 a recess 69 for the retaining element 24.

[0069] At the in Fig. 21 In the illustrated alternative embodiment, the second pivot bearing 18 of the second control element 12 is arranged in the area of ​​the third pivot axis 16 of the third control element 13. In this embodiment, the third pivot axis 16 extends according to Fig. 21 through the second pivot bearing 18. In Fig. 21 The retaining element 24 is not shown.

[0070] More on the Figs. 19 to 21 Features not described in detail advantageously correspond to those of the preceding embodiment.

[0071] The Figures 22 to 30 Figures show another embodiment of a handle for a tool. The same reference numerals denote corresponding elements in all figures. To avoid repetition, reference numerals that appear in the figures are renamed. Figures 22 to 30 For elements shown but not described again below, reference is made to the description of the corresponding elements in the preceding figures.

[0072] The in the Figures 22 to 30 The illustrated embodiment differs from the preceding embodiments, among other things, in the design of the retaining element 24 and the arrangement and design of the projection 40 and retaining section 41. Fig. 23 As shown, a projection 40 is arranged on an end face 74 of the second control element 12. The end face 74 extends around the second pivot axis 15 and is a front face of the second control element 12 visible when looking in the direction of the second pivot axis 15. Fig. 24 As shown, a further projection 40 is provided on the front face 74 of the second control element 12. A version with only one projection 40 or three or more projections 40 is also possible.

[0073] In Fig. 23The position of the guide tube 2 is shown schematically, which protrudes through the second control element 12 and is completely enclosed by the second control element 12 over 360° around the second pivot axis 15.

[0074] Fig. 24 Figure 1 shows the design of the second control element 12 in perspective view. The second control element 12 has two control sections 36 and 37, which are arranged opposite each other. How Fig. 24 As shown, the second control element 12 in the area of ​​the opening 19 is approximately ring-shaped around the second pivot axis 15 ( Fig. 23 ) formed. The guide tube 2 protrudes through the opening 19 ( Fig. 23 ).

[0075] How Fig. 26As shown, the retaining element 24 in the exemplary embodiment is approximately U-shaped. The retaining element 24 is pivotably mounted about the pivot axis 25 with the bearing pin 59. The pivot axis 25 is located adjacent to the base of the U formed by the retaining element 24. The two legs of the U carry the retaining sections 41, which project towards an end face 74 of the second operating element 12 and interact with the projections 40 of the second operating element 12.

[0076] In the unactivated position of the second control element 12, as Fig. 23The figure shows the end face 73 of the retaining section 41 of the retaining element 24 adjacent to the end face 53 of the projection 40. The retaining element 24 is coupled to the third operating element 13 via the spring 29. The first end 54 of the spring 29 rests in a receptacle 56 of the third operating element 13. The second end 55 of the spring 29 rests against the retaining element 24. When the third operating element 13 is actuated, the retaining element 24 is biased by the spring 29 against the end face 53 of the second operating element 12.

[0077] In the unactivated position 20 of the second control element 12 ( Fig. 23 ) the mounting surfaces 51 and 52 on the projection 40 are inclined to the second pivot axis 15.

[0078] The Figures 25 to 30The figures show the second control element 12 in its second actuated position 22. In this position, the end face 53 of the projection 40 is pivoted out of the pivot range of the end face 73 of the retaining section 41. The third control element 13 is in its actuated position 45, in which the retaining element 24 is biased against the second control element 12. Due to the bias, the retaining element 24 is pivoted relative to the position shown in the preceding figures. The locking section 62 has moved out of the pivot range of the first control element 11, so that the first control element 11 could be moved into its actuated position 43.

[0079] The retaining element 24 is positioned as follows: Fig. 26The figure shows that, in the pivoted position, a contact surface 72 of the retaining section 41 rests against a contact surface 52 of the projection 40. The contact surface 52 lies within the pivot path of the projection 40 in the direction of the unactuated position 20 of the second operating element 12. The retaining element 24 thus holds the second operating element 12 in the second actuated position 22 as long as the third operating element 13 is held by the operator in its actuated position 45. In the exemplary embodiment, the retaining element 24 engages the second operating element 12 on the first side 9 of the central plane 8 and projects into its pivot path.

[0080] The projection 40 located on the opposite side of the second control element 12 interacts with the associated holding section 41 in the same way as Fig. 26 shows.

[0081] If the second control element 12 is moved to its first actuated position 21 (not shown) (see Fig. 7), the first contact surface 51 of the projections 40 and the first contact surface 71 of the associated holding section 41 work together to hold the second control element 12 in the first actuated position 21 as long as the third control element 13 is in its actuated position 45.

[0082] How Fig. 27 As shown, the second control element has the locking section 62, which is formed by two ribs 75. Similarly, the locking area 63 on the first control element 11 is formed by two ribs 80 on the first control element 11.

[0083] A different number and / or arrangement of ribs 75 and 80 or a different design of the locking section 62 and / or the locking area 63 may also be advantageous.

[0084] Fig. 28 shows the arrangement of the retaining element 24 on the second operating element 12.

[0085] The Figures 29 and 30Figure 1 shows the arrangement of the spring 38, which biases the second control element 12 into the unactuated position 20. In the exemplary embodiment, the spring 38 is designed as a torsion spring or leg spring. However, another design of the spring 38 may also be advantageous. The spring 38 has two legs 81 and 82, which are supported on the second control element 12 and on the housing 46, respectively. The second control element 12 has brackets 83 for support on the second control element 12.

[0086] How Fig. 29 As shown, both legs 81 and 82 are supported on the same housing half-shell 67 of the housing 46. For this purpose, the legs 81 and 82 project into a receptacle 84 formed in the housing half-shell 67. However, a different support design can also be advantageous. Because both legs 81 and 82 are supported on the same component, positional tolerances between the housing 46 and the spring 38 can be minimized.

[0087] When the second control element 12 is pivoted, one of the legs 81 or 82 rests against a bracket 83 and the other leg 81 or 82 rests against the receptacle 84 of the housing 46.

Claims

1. Hand-held implement having a drive motor (4), having at least one tool (23) which is driven by the drive motor (4), and having at least one handle (5), wherein a first operating element (11), a second operating element (12) and a third operating element (13) are mounted pivotably on the handle (5), wherein the first operating element (11) is configured for activating the drive motor (4) and is mounted so as to be pivotable about a first pivot axis (14), wherein the second operating element (12) is mounted so as to be pivotable about a second pivot axis (15), wherein provision is made of a blocking device (30) which, in a release position (31) of the blocking device (30), releases the first operating element (11) with regard to operation of the drive motor (4) and, in a blocking position (32) of the blocking device (30), blocks the first operating element (11) with regard to operation of the drive motor (4), wherein the blocking device (30) is adjustable between the release position (31) and the blocking position (32) via the second operating element (12), wherein the third operating element (13) is mounted so as to be pivotable about a third pivot axis (16), wherein, in its actuated position (45), the third operating element (13) holds the second operating element (12) in its actuated position via a holding element (24), wherein the holding element (24) is mounted so as to be pivotable about a fourth pivot axis (25), characterized in that the second pivot axis (15) lies in a plane (28) which is perpendicular to the fourth pivot axis (25).

2. Implement according to Claim 1, characterized in that, in a non-actuated position (20), the second operating element (12) blocks a movement of the first operating element (11) towards an actuated position (43) of the first operating element (11).

3. Implement according to Claim 1 or 2, characterized in that the second operating element (12) is pivotable from the non-actuated position (20) into a first release position (21) in a first pivoting direction (49) and into a second release position (22) in a second, opposite pivoting direction (50).

4. Implement according to one of Claims 1 to 3, characterized in that the third pivot axis (16) is parallel to the first pivot axis (14).

5. Implement according to one of Claims 1 to 4, characterized in that the third operating element (13) acts on the holding element (24) via a spring (29).

6. Implement according to one of Claims 1 to 5, characterized in that the fourth pivot axis (25) is parallel to the third pivot axis (16).

7. Implement according to one of Claims 1 to 6, characterized in that the implement (1) has a guide tube (2) which, at its free end, carries a tool unit (3).

8. Implement according to Claim 7, characterized in that the second operating element (12) extends around a longitudinal central axis (7) of the guide tube (2) over an angle of at least 180°.

9. Implement according to Claim 7 or 8, characterized in that the second operating element (12) is mounted pivotably on a first pivot bearing (17) and a second pivot bearing (18), and in that the blocking device (30) and the first pivot bearing (33) of the second operating element (12) are arranged on a line that is parallel to the longitudinal central axis (7) of the guide tube (2).

10. Implement according to one of Claims 1 to 9, characterized in that the second operating element (12) has a first operating portion (35), a second operating portion (36) and a third operating portion (37), wherein the operating portions (35, 36, 37) are directed radially outwards.