EP2460630B1 - Manually operated power tool - Google Patents

Description

The invention relates to a hand-held working device of the type specified in the preamble of claim 1, such a working device is in DE 4 120 876 disclosed.

From the DE 41 20 876 C2 is a hand-held implement with an upper handle, namely a top-hand saw, known. On the handle a mode selector, a throttle lever and a throttle lock are pivotally mounted, wherein the mode selector and the throttle cooperate in the starting position of the mode selector and the throttle lever. The detent elements of mode selector and throttle lever defining the start position are arranged so that the mode selector can be pressed into the starting position when the throttle lever is not actuated. The throttle is pivoted. This pivoting movement is locked when not activated throttle lock. However, if the throttle lever lock is pressed, the starting position can be inserted without the throttle lever is actuated.

It is desirable that insertion of the start position of the mode selector is not possible if the throttle lever is not depressed by the operator.

The invention has for its object to provide a hand-held implement of the generic type, which allows insertion of the starting position only when the throttle is depressed.

This object is achieved by a hand-held implement with the features of claim 1.

Characterized in that the second locking element is in the unactuated position of the throttle lever outside the pivoting path of the first locking element on the mode selector, the mode selector can be pivoted freely when not actuated throttle. There is no catch between the mode selector and the throttle. The mode selector is therefore moved back to the operating position due to its spring load when released from the starting position. Inserting the starting position without first pressing the throttle lever is not possible.

Advantageously, when adjusting the throttle lever from the unactuated position in the full throttle position, the second locking element is pivoted by the pivoting of the first locking element. In full throttle position, the second latching element is advantageously outside the pivoting path of the first latching element. The position outside of the pivoting path comprises both a position relative to the pivot axis of the throttle lever radially outside the pivoting path and a position radially within the pivoting path. In particular, the second locking element is in the unactuated position of the throttle lever radially outside and full throttle position radially within the pivoting path of the first locking element, thus has in the unactuated position a larger and full throttle position a smaller distance from the pivot axis of the throttle lever than the first locking element. The mode selector can thus be adjusted only when the throttle lever has been adjusted so far that the second locking element is outside the pivoting path of the first locking element.

In order to ensure latching in the starting position, it is provided that the first latching element lies in the starting position of the operating mode actuator in the pivoting path of the second latching element. As a result, the second locking element comes after releasing the throttle lever to rest on the first locking element and is held in the starting position.

Advantageously, the locking elements extend in the direction of the pivot axis of the throttle lever. When pivoting the mode selector from the start position to the off position is provided that the locking of the locking elements is released, wherein at least one of the locking elements in the direction of the pivot axis of the throttle lever is deflected away from the other locking element. By the deflection in the direction of the pivot axis to release the locking can be ensured that the throttle lever is not further actuated when pivoting the mode selector from the start position to the off position. However, it can also be provided that additionally or alternatively at least one of the latching elements is elastically deformed when releasing the latching. Even with an elastic deformation of at least one of the locking elements further actuation of the throttle lever when releasing the locking can be avoided. Advantageously, at least one of the locking elements has a portion inclined to the pivot axis of the throttle lever, which slides on pivoting of the mode selector from the starting position to the off position on the other locking element. The inclined portion may be straight, such as a chamfer, or arcuate, such as in a radius. In particular, one of the locking elements is a pin. A pin is simple and can be produced with low tolerances and can be easily manufactured in the production of the mode selector made of plastic with the mode selector. Also, the verification of compliance with the required tolerances is easily possible with a pin, as a pin can be easily measured. The inclined to the pivot axis of the throttle lever extending portion is advantageously arranged at the free end of the pin. A chamfer or a radius can be very easily formed at the free end of the pin, so that results in a simple design. A radius is considered to be particularly advantageous because sharp edges on the pin can thereby be avoided.

Suitably, one of the latching elements is an arcuate wall section which forms a receptacle for the other latching element. Due to the arched design a secure locking is achieved. The pin can be hung behind the arcuate section and is held so securely. The wall section is arranged in particular on an arm of the gas lever. The arcuate shape of the wall portion prevents simultaneous insertion of the starting position of the Betriebsstellstellers without sufficient operation of the throttle lever. In detent position, the pin is advantageously on the concave side of the wall portion. When the mode selector is pressed in the OFF position, the journal exerts on the wall section a force in the radial direction to the pivot axis, which is converted by the chamfer or the radius into an axial force. To insert In the starting position, the mode selector must rest on the convex side of the wall section and press against the convex wall section. Due to the arcuate shape of the wall portion of the force exerted by the pin force of the throttle lever is pivoted, and inserting the starting position is not possible.

In particular, the mode selector has a receptacle for a contact pin. The contact pin can interact with the contact spring of an ignition device and short-circuit the drive motor designed as an internal combustion engine in the off position of the mode selector. At the same time a desired spring load of the mode selector can be achieved via the contact spring. In particular, the pivot axes of throttle lever, throttle lock and mode selector are parallel to each other and have a distance to each other.

Advantageously, the throttle lever engages an actuating element for actuating a drive motor of the working device. The distance between the point of application of the actuating element to the second locking element is advantageously up to about one third of the distance of the point of application of the actuating element to the pivot axis of the throttle lever. Due to the comparatively small distance of the point of application to the locking element are achieved for the starting position, which is set by the actuator, low tolerances. It can be achieved in a simple manner, a precise position, for example, a throttle element in the starting position.

Fig. 1

eine schematische Seitenansicht einer Motorsäge,

Fig. 2

eine ausschnittsweise Seitenansicht des oberen Handgriffs der Motorsäge aus Fig. 1 mit abgenommener oberer Griffhalbschale,

Fig. 3

eine Seitenansicht von Gashebelsperre, Gashebel und Betriebsartensteller in Aus-Stellung,

Fig. 4

eine Seitenansicht der Hebel aus Fig. 3 in Vollgasstellung des Gashebels,

Fig. 5

eine Seitenansicht der Hebel aus Fig. 3 in Startstellung,

Fig. 6

eine perspektivische Darstellung der Hebel in der Stellung aus Fig. 5,

Fig. 7

eine schematische Schnittdarstellung durch die Hebel in der Stellung aus den Fig. 5 und 6,

Fig. 8 und 9

perspektivische Darstellungen des Gashebels,

Fig. 10

eine Seitenansicht des Gashebels in Richtung des Pfeils X in Fig. 8,

Fig. 11 und Fig. 12

perspektivische Darstellungen des Betriebsartenstellers,

Fig. 13

einen Schnitt durch den Betriebsartensteller.

An embodiment of the invention will be explained below with reference to the drawing. Show it:

Fig. 1

a schematic side view of a power saw,

Fig. 2

a partial side view of the upper handle of the chainsaw Fig. 1 with removed upper grip half shell,

Fig. 3

a side view of throttle lock, throttle and mode selector in the off position,

Fig. 4

a side view of the lever Fig. 3 in full throttle position of the throttle lever,

Fig. 5

a side view of the lever Fig. 3 in starting position,

Fig. 6

a perspective view of the lever in the position Fig. 5 .

Fig. 7

a schematic sectional view through the lever in the position of the FIGS. 5 and 6 .

8 and 9

perspective views of the throttle lever,

Fig. 10

a side view of the throttle lever in the direction of arrow X in Fig. 8 .

11 and FIG. 12

perspective views of the mode selector,

Fig. 13

a section through the mode selector.

Fig. 1 shows as an exemplary embodiment of a hand-held implement a chainsaw 1. The chainsaw 1 is in Fig. 1 shown in a usual parking position. The power saw 1 has a housing 2 which is parked in the parking position on the floor or a storage area. On the housing 2, a guide rail 5 projects to the front, on which a saw chain 6 is driven in rotation. The saw chain 6 is driven by a housing 2 arranged in the drive motor 10, which is designed as an internal combustion engine. The drive motor 10 is supplied via a carburetor 11 and an intake passage 12 fuel and combustion air. It can also be provided to supply the fuel directly to the drive motor 10. The carburetor 11 is in a rear, the guide rail 5 remote region of an upper handle 3 is arranged. The upper handle 3 is arranged on the upwardly projecting in Abstellposition side of the housing 2 and fixed to the housing 2 via anti-vibration elements, not shown. The upper handle 3 serves as a carrying handle. At the upper handle 3, a throttle lever lock 7, a throttle lever 8 and a mode selector 9 are pivotally mounted. Adjacent to the front end of the upper handle 3, a hand guard 4 is arranged, which serves to trigger a chain brake for the saw chain 6.

As Fig. 2 shows, the throttle lock 7 is pivotally mounted about a pivot axis 13. The throttle lock 7 has a locking shoulder 17, which prevents actuation of the throttle lever 8 in the unactuated position of the throttle lock 7. For this purpose, the locking collar 17 is adjacent to a locking edge 18 of the throttle lever 8. The throttle lever 8 is pivotally mounted about a pivot axis 14 which has a distance a to the pivot axis 13 of the throttle lever lock 7. To accelerate the throttle lever 8 is pivoted in the direction of the arrow 26 about the pivot axis 14. The throttle lever 8 has an arm 22 to which a gas linkage 16 is suspended for actuating a throttle element arranged in the carburetor 11. The throttle linkage 16 is suspended in an opening 28 of the arm 22. Adjacent to its free end, an arcuate wall portion 20 is disposed on the arm 22, which is offset from the surface of the arm 22 in the direction of the pivot axis 14.

The mode selector 9 is pivotally mounted about a pivot axis 15, the distance to the pivot axis 14 of the throttle lever 8 b and the pivot axis 13 of the throttle lock 7 has a distance c. The mode selector 9 has an in Fig. 2 shown pin 21. The pin 21 and the wall portion 20 form locking elements which cooperate in the starting position. When pivoting the throttle lever 8, the wall portion 20 defines a pivoting path 44 and the pin 21 a pivoting 45th Fig. 2 shows the mode selector 9 in the operating position 40. The throttle lever 8 is arranged in the unactuated position 48. In this position, the wall portion 20 is outside the pivoting path 45 of the pin 21. The mode selector 9 can be moved freely in this position, without the pin 21 in engagement with the wall portion 20 can come. This prevents that when the throttle lever 8 is operated, a latching between mode selector 9 and throttle lever 8 can take place.

Fig. 3 shows the throttle lever 8 in the de-energized position 48 and the mode selector 9 in the off position 42. In this position, the mode selector 9 was compared with the in Fig. 2 shown operating position 40 pivoted in the direction of arrow 25. The mode selector 9 has an arm 24 which projects radially to the pivot axis 15 in the direction of the throttle lever 8. In off position 42 of the arm 24 is located on a stop, not shown, of the handle 3. The arm 24 is designed so that it rests in any position of the throttle lever 8 on the stop, so that regardless of the position of the throttle lever 8, a stop for the off position 42 is given. As Fig. 3 shows, the arcuate wall portion 20 forms a receptacle 43 for the pin 21st

The throttle linkage is on the arm 22 of the throttle lever in an opening 28 (FIG. Fig. 8 ), which has a distance e to the pivot axis 14 of the throttle lever. The opening 28 has a distance d from the wall section 20 that is up to one third of the distance e ( Fig. 3 ). Due to the small distance of the suspension of the gas linkage 16 for locking an accurate positioning of the gas linkage 16 is achieved in the starting position.

Fig. 4 shows the throttle 8 in full throttle position 47. To get into the full throttle position 47, the throttle lever 8 was from the in Fig. 2 shown position in the direction of arrow 26, in the illustrations in the clockwise direction, pivoted. In order to pivot the throttle 8, the throttle lock 7 was first pressed. As a result, the locking collar 17 enters a receptacle 19 in the throttle lever 8. The locking edge 18 of the throttle lever 8 can swing freely past the locking shoulder 17. To achieve the full throttle position 47 of the throttle lever 8, the wall portion 20 is pivoted by the pivoting path 45 of the pin 21. The pivoting path 44 of the wall portion 20 intersects the pivoting path 45 of the pin 21 and when accelerating the wall portion 20 is moved from the lying with respect to the pivot axis 15 radially outward of the pivot path 45 side lying on the radially within the pivoting path 45 side. To get out of the Fig. 4 shown full throttle 47 to switch to start position 41 of the mode selector 9, the Mode selector 9 in the direction of arrow 27, in Fig. 4 thus counterclockwise, pivoted. If the throttle lever 8 is then released, the wall section 20 hangs on the pin 21. This is in Fig. 5 shown. The throttle lever 8 is held in a starting position 46, in which the throttle lever 8 is partially actuated, that is adjusted from the unactuated position partially in the direction of the full throttle position. When pivoting the mode selector 9 from the operating position 40 into the starting position 41 of the pin 21 is moved in the pivoting path 44 of the wall portion 20, ie, where the pivoting paths 44 and 45 intersect.

As Fig. 6 shows, the pin 21 is in the receptacle 43 when the throttle lever 8 in start position 46 and the mode selector 9 are in start position 41. As Fig. 6 Also shows, the throttle lever lock 7 is pivotally mounted with a bearing pin 35 in the upper handle 3. The throttle lever 8 has a receptacle 39, in which a bearing pin 36 is arranged for pivotal mounting in the upper handle 3. The mode selector 9 has a hollow bearing shaft 32, with which it is pivotally mounted in the handle 3.

Fig. 7 illustrates the position of the pin 21 in the receptacle 43, which is formed by the wall portion 20. As Fig. 7 also shows, the mode selector 9 has a cover wall 34 which extends in a circular arc around the pivot axis 15. The cover wall 34 covers an opening formed in the upper handle 3 opening, through which an actuating portion 37 of the mode selector 9 protrudes.

As Fig. 8 shows, the throttle lever 8 has an operating portion 38 which protrudes from the upper handle 3 and is operated by the operator. On the wall section 20, a chamfer 29 is formed on the pivoting path 45 of the pin 21 in the unactuated position 48. As Fig. 9 shows, on the opposite side of the arm 22, a chamfer 30 is arranged, which will be described in more detail below.

As the FIGS. 11 and 12 show, is formed on the bearing shaft 32 of the mode selector 9 in the axial direction of the pivot axis 15 adjacent to the actuating portion 37, a receptacle 33 for a contact pin. As the FIGS. 11 and 12 also show the possesses Pin 21 at its free end a radius 31, which allows the release of the starting position 41 by lateral deflection of the wall portion 20. If the mode selector 9 from the in the Fig. 5 to 7 The starting position 41 shown in the off position 42, the radius 31 causes a lateral deflection of the arm 22 with the wall portion 20. The radius 31 slides on the wall portion 20 and deflects it in the direction of the pivot axis 14 of the throttle lever 8. As a result, a release of the detent position is possible with a corresponding effort, so that the off position 42 can be inserted from the starting position 41 alone by pressing the mode selector 9. Alternatively or additionally, an elastic deformation of the pin 21 and / or the wall portion 20 may be provided for releasing the locking. Characterized in that the wall portion 20 and / or the pin 21 to move in the axial direction of the pivot axis 14 and not in the circumferential direction to the pivot axis 14, an actuation of the throttle lever 8 when releasing the detent position is avoided. Instead of pressing the mode selector 9, a release of the starting position is also possible in the usual way by accelerating. In this case, the wall portion 20 pivots out of the pivoting path 45 of the pin 21, whereby the latching is released.

The bearing shaft 32 has directly adjacent to the cover wall 34, on which the pin 21 is disposed, a recess 49 into which the arm 22 of the throttle lever 8 in the in Fig. 4 full throttle position shown dives. In order to avoid snagging of the throttle lever 8 at the edge of the recess 49 when accelerating, the chamfers 29 and 30 are provided on the throttle lever 8. The chamfers 29 and 30 are used when accelerating as insertion bevels.

Claims (14)

1. Hand-guided working implement, comprising a handle (3) which in the usual storage position is located above a housing (2) of the working implement and forms a carrying handle for the working implement, a throttle lever (8) and a throttle lever lock (7) being provided on the handle (3), and further comprising a mode selector (9) having an off position (42), an operating position (40) and at least one starting position (41), wherein the mode selector (9), the throttle lever lock (7) and the throttle lever (8) are pivotably mounted and wherein a first latching element (21) is provided on the mode selector (9) and a second latching element (20) is provided on the throttle lever (8), which latching elements are provided for acting together in the starting position (41) of the mode selector (9) and the starting position (46) of the throttle lever (8) and for holding the throttle lever (8) in the starting position (46),
   characterised in that the second latching element (20) lies outside the pivoting range (45) of the first latching element (21) in the inoperative position of the throttle lever (8).
2. Working implement according to claim 1,
   characterised in that, when the throttle lever (8) is moved from the inoperative position (48) into the full throttle position (47), the second latching element is pivoted through the pivoting range of the first latching element, and in that the second latching element lies outside the pivoting range (45) of the first latching element in the full throttle position (47) of the throttle lever (8).
3. Working implement according to claim 1 or 2,
   characterised in that the first latching element lies in the pivoting range (44) of the second latching element in the starting position (46) of the mode selector (9).
4. Working implement according to any of claims 1 to 3,
   characterised in that the latching elements extend in the direction of the pivoting axis (14) of the throttle lever (8), and in that the engagement of the latching elements is released when the mode selector (9) is moved from the starting position (41) into the off position (42).
5. Working implement according to claim 4,
   characterised in that at least one of the latching elements is deflected away from the other latching element towards the pivoting axis (14) of the throttle lever (8) when the engagement is released.
6. Working implement according to claim 4 or 5,
   characterised in that at least one of the latching elements is elastically deformed when the engagement is released.
7. Working implement according to any of claims 4 to 6,
   characterised in that at least one of the latching elements has a section which extends at an angle relative to the pivoting axis (14) of the throttle lever (8), which section slides on the other latching element if the mode selector (9) is pivoted from the starting position (41) into the off position (42).
8. Working implement according to claim 7,
   characterised in that one of the latching elements is a peg (21).
9. Working implement according to claim 8,
   characterised in that the section (31) which extends at an angle relative to the pivoting axis (14) of the throttle lever (8) is located at the free end of the peg (21).
10. Working implement according to any of claims 1 to 8,
    characterised in that one of the latching elements is a curved wall section (20) which forms a receptacle (43) for the other latching element.
11. Working implement according to claim 10,
    characterised in that the wall section (20) is located on an arm (22) of the throttle lever (8).
12. Working implement according to any of claims 1 to 11,
    characterised in that the mode selector (9) has a receptacle (33) for a contact pin.
13. Working implement according to any of claims 1 to 12,
    characterised in that the pivoting axes (13, 14, 15) of the throttle lever lock (7), the throttle lever (8) and the mode selector (9) extend parallel to one another, each having a distance (a, b, c) from one another.
14. Working implement according to any of claims 1 to 13,
    characterised in an actuating element acts on the throttle lever (8) for actuating a drive motor of the working implement, the distance (d) between the point of action of the actuating element and the second latching element being approximately a third of the distance (e) between the point of action of the actuating element and the pivoting axis (14) of the throttle lever (8).

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