EP2247413B1 - Vibration-reduced handle - Google Patents

Abstract

The invention relates to a handle, in particular an auxiliary handle (10), for controlling a hand machine-tool (1), said handle comprising at least one fixing element (12) and a grip element (14) that can be moved in relation to the fixing element (12). Said grip element (14) comprises at least one connecting element (18) comprising a damping device (28), said connecting element connecting said grip element (14) in such a manner to the fixing element (12) that it can be moved in a damped manner from the rest position. Said connecting element (18) radially surrounds the fixing element (12). Also, the grip element (14) can be fixed in relation to the fixing element (12) by means of a locking device (20) in a pivoting position defining the rest position such that the mode of action of the said damping device (28) is essentially not influenced.

Description

State of the art

The invention relates to a vibration-decoupled handle, in particular a vibration-decoupled auxiliary handle for a hand tool and a hand tool with a vibration-decoupled handle, preferably a vibration-decoupled auxiliary handle according to the preamble of the independent claims.

From the EP 1400 317 A1 is a designed as a bow handle vibration-isolated auxiliary handle known. The auxiliary handle has a mounting portion which is connected to a grip portion via a vibration-damping, elastic material. The elastic material forms at least in the region of the connection, the surface of the auxiliary handle. In particular, the grip region and the attachment region are connected to one another by the elastic material such that a further connection means is dispensed with. In the event of damage to the elastic material, as may be caused, inter alia, by partially considerable vibration forces, and subsequent cracking or breakage of the elastic material, destruction of the handle, in particular detachment of the grip area from the attachment area, may occur.

Disclosure of the invention Advantages of the invention

The handle according to the invention, in particular additional handle with the features of claim 1 has the advantage that the handle element has a connecting element which surrounds the fastening element radially. The connecting element is rigidly connected to the handle element, preferably embodied integrally therewith. The enclosure may in particular be designed so that the grip element in a Circumferential direction around the fastening element is movable, in particular pivotable, but without being removable from the fastening element in the radial direction.

A further advantage is to be considered that the radially enclosing arrangement of a connecting element to the fastener allows a convenient arrangement, in particular receiving a damping device for damping a movement of the handle member relative to the fastener.

The measures listed in the dependent claims, advantageous refinements and improvements of the main claim features.

An advantageous embodiment of a damping device of a handle according to the invention comprises at least one elastic element. The elastic element has in particular a spring element and / or a rubber-elastic material and / or a porous material.

In a particularly cost-effective manner, the elastic element consists essentially of a rubber-elastic material and / or a porous material.

In a particularly compact embodiment of a damping device, the damping device is arranged between an inner circumferential surface of the connecting element and an outer lateral surface of the fastening element. The inner circumferential surface and the outer circumferential surface are operatively connected to one another by the damping device. In particular, in an effective manner to an element - fastening or connecting element - acting forces attenuated by the damping device to the respective other element - connecting or fastening element - transferred.

In a particularly effective embodiment, the elastic element has a rubber-elastic material, which is vulcanized or adhesively bonded to the inner lateral surface of the connecting element and / or the outer lateral surface of the fastening element.

A possible uniform effect of the handle according to the invention provides at least one, preferably two radially projecting bearing disks. The contact disks are arranged on the fastening element in such a way that they axially surround a radial enclosing region of the fastening element. In an advantageous manner, the contact disks extend in a radial extent beyond an outer diameter of the outer lateral surface of the fastening element. Preferably, the contact disks are made in one piece with the fastening element.

In a particularly protected embodiment, the elastic element is arranged between the system disks. In particular, the elastic element can be supported on the system disks.

A particularly comfortable embodiment of a handle according to the invention is achieved by a bow-shaped design of the grip element. In particular, for larger and / or heavy hand tool machines, the execution as a bar handle due to the larger forces occurring advantageous. The training as a strap handle also allows a comfortable working posture of the operator, since the tool can be guided laterally, without twisting the hand of the operator is necessary. At the same time a good vibration damping can be achieved through the closed frame of the auxiliary handle. If the bow-shaped grip element has connecting elements at its two end regions which radially surround the fastening element, a uniform force distribution is achieved.

Cost-effective, the connection areas are substantially the same, preferably identical.

In a particularly convenient for the use of a power tool embodiment of a handle according to the invention, in particular an auxiliary handle according to the invention, the handle element is designed to be pivotable relative to the fastener. In this case, an actuating element comprehensive locking device is provided, with which the grip element can be fixed in a selectable pivot position. By actuating the actuating element by an operator, the locking device can be released and fixed again. The selected pivot position defines a rest position of the handle member relative to the fastener. The damping device of the handle according to the invention allows an elastic deflection of the grip element from this rest position.

A particularly simple embodiment of a locking device has a toothing.

In an advantageous embodiment of a handle according to the invention, the elastic deflection of the pivoting position is limited starting from the rest position by a limiting means to an angular range W. With this limiting means possible overloading of the damping device, in particular by stretching and / or stretching loads are largely prevented.

In a preferred embodiment of a handle according to the invention, the elastic deflection of the pivotal position, starting from the rest position in one direction is greater than in the corresponding opposite direction. When used in one Working state of the power tool, the hand tool is pressed by the operator by means of the handle according to the invention against a workpiece. The direction of the contact pressure defines a printing direction. The grip element is loaded in this working state in the pressure direction and deflected relative to the fastening element. In order to effectively damp vibrations, the elastic deflection is preferably desired in this printing direction. After completion of the workpiece processing, ie the transition from the working state to an idle state, the hand tool is lifted by the operator from the workpiece. For this purpose, the operator pulls the power tool against the pressure direction of the workpiece away, whereby a pulling direction is defined. The handle element is loaded in the pulling direction. In order to use as small forces as possible when removing the power tool from the workpiece, it is preferable to ensure that the elastic deflection in the pulling direction is small, preferably negligible, ideally equal to zero.

A particularly versatile and comfortable embodiment of a handle according to the invention, in particular an additional handle according to the invention provides a fixing device for releasably fixing the handle on a machine housing of the power tool. The fixing device is connected to the fastening element. In particular, the fixing device can allow a, in a circumferential direction on the machine housing selectable orientation of the handle relative to the machine housing, in particular a machine axis, which further increases the comfort for the operator. As a further advantage is to be considered that the fixing device allows usability of the handle according to the invention on various hand tool machines by exchange.

In a particularly easy-to-use embodiment, the fixing device can be closed and opened via the actuating element.

In a structurally simple embodiment, the fixing device comprises a clamping band, with which the handle can be fixed to the hand tool.

If the tensioning band has recesses which interact with the toothing, a joint actuation of locking device and fixing device is implemented in a particularly simple manner.

In a low-cost, robust and easily adaptable embodiment, the fixing device comprises a clamping screw, and the actuating element is designed substantially as a clamping nut.

If the clamping nut is supported on a contact disk, a largely uniform effect of the damping device which is largely independent of external influences is ensured.

Description of the drawings

• Fig. 1 eine perspektivische Ansicht eines Bohrhammers mit einem erfindungsgemäßen Zusatzhandgriff
• Fig. 2 eine Seitenansicht eines ersten Ausführungsbeispiels eines erfindungsgemäßen Zusatzhandgriffs
• Fig. 3a und 3c je eine Seitenansicht eines zweiten bzw. dritten Ausführungsbeispiels eines Zusatzhandgriffs nach Fig. 2 mit einem ersten bzw. zweiten Einschränkungsmittel zur Begrenzung der elastischen Auslenkung aus der Ruhelage des Griffbereichs
• Fig. 3b und 3d je eine Detailansicht des ersten bzw. zweiten Einschränkungsmittels in Blickrichtung B-B
• Fig. 4a bis 4d Schnittansichten entlang der Linie A-A gemäß Fig. 2 des Verbindungsbereichs eines vierten Ausführungsbeispiels mit unterschiedlichen Dämpfungsvorrichtungen mit einem Federelement
• Fig. 4b Schnittansichten entlang der Linie A-A gemäß Fig. 2 des Verbindungsbereichs eines fünften Ausführungsbeispiels mit unterschiedlichen Dämpfungsvorrichtungen mit einem Federelement
• Fig. 4c Schnittansichten entlang der Linie A-A gemäß Fig. 2 des Verbindungsbereichs eines sechsten Ausführungsbeispiels mit unterschiedlichen Dämpfungsvorrichtungen mit einem Federelement
• Fig. 4d Schnittansichten entlang der Linie A-A gemäß Fig. 2 des Verbindungsbereichs eines siebten Ausführungsbeispiels mit unterschiedlichen Dämpfungsvorrichtungen mit einem Federelement
• Fig. 5a eine Schnittansicht entlang der Linie A-A gemäß Fig. 2 des Verbindungsbereichs eines achten Ausführungsbeispiels mit einer Dämpfungsvorrichtung mit einem gummielastischen Material
• Fig. 5b eine Schnittansicht entlang der Linie A-A gemäß Fig. 2 des Verbindungsbereichs eines neunten Ausführungsbeispiels mit einer Dämpfungsvorrichtung mit einem porösen Material
• Fig. 5c eine Schnittansicht entlang der Linie A-A gemäß Fig. 2 des Verbindungsbereichs eines zehnten Ausführungsbeispiels mit einer Dämpfungsvorrichtung mit einem innenliegenden Einschränkungsmittel zur Begrenzung der elastischen Auslenkung aus der Ruhelage des Griffbereichs
• Fig. 6a eine Schnittansicht entlang der Linie A-A gemäß Fig. 2 des Verbindungsbereichs eines elften Ausführungsbeispiels mit einer, eine Luftfeder umfassenden Dämpfungsvorrichtung
• Fig. 6b die Luftfeder eines zwölften Ausführungsbeispiels einer Dämpfungsvorrichtung mit richtungsabhängiger Elastizität
• Fig. 7a eine Schnittansicht entlang der Linie A-A gemäß Fig. 2 des Verbindungsbereichs eines dreizehnten Ausführungsbeispiels mit einer Dämpfungsvorrichtung mit einem porösen Material und lamellenartigen Übertragungsmitteln
• Fig. 7b eine Dämpfungsvorrichtung ähnlich wie in Fig. 7a eines vierzehnten Ausführungsbeispiels jedoch mit asymmetrisch angeordneten, lamellenartigen Übertragungsmitteln

Embodiments of the invention are illustrated in the drawings and explained in more detail in the following description. Show it:

• Fig. 1 a perspective view of a hammer drill with an additional handle according to the invention
• Fig. 2 a side view of a first embodiment of an additional handle according to the invention
• Fig. 3a and 3c depending on a side view of a second or third embodiment of an additional handle after Fig. 2 with a first or second restriction means for limiting the elastic deflection from the rest position of the grip area
• Fig. 3b and 3d each a detail view of the first or second restriction means in the direction BB
• Fig. 4a to 4d Sectional views along the line AA according to Fig. 2 the connection region of a fourth embodiment with different damping devices with a spring element
• Fig. 4b Sectional views along the line AA according to Fig. 2 the connection region of a fifth embodiment with different damping devices with a spring element
• Fig. 4c Sectional views along the line AA according to Fig. 2 the connecting portion of a sixth embodiment with different damping devices with a spring element
• Fig. 4d Sectional views along the line AA according to Fig. 2 the connecting portion of a seventh embodiment with different damping devices with a spring element
• Fig. 5a a sectional view taken along the line AA according to Fig. 2 the connecting portion of an eighth embodiment having a damping device with a rubber-elastic material
• Fig. 5b a sectional view taken along the line AA according to Fig. 2 the connecting portion of a ninth embodiment with a damping device with a porous material
• Fig. 5c a sectional view taken along the line AA according to Fig. 2 the connection portion of a tenth embodiment with a damping device with an internal restriction means for limiting the elastic deflection from the rest position of the handle portion
• Fig. 6a a sectional view taken along the line AA according to Fig. 2 the connecting portion of an eleventh embodiment with a damping device comprising an air spring
• Fig. 6b the air spring of a twelfth embodiment of a damping device with directional elasticity
• Fig. 7a a sectional view taken along the line AA according to Fig. 2 the connection portion of a thirteenth embodiment with a damping device with a porous material and lamellar transmission means
• Fig. 7b a damping device similar to Fig. 7a a fourteenth embodiment, however, with asymmetrically arranged, lamellar transmission means

Description of the embodiments

Fig. 1 shows a hammer drill 1 as an example of a power tool with a machine housing 2, an inserted in a tool holder 3 insert tool 4, which defines a machine axis 5, and one, in a front portion 6 of the machine housing 2 as an additional handle 10 formed according to the invention handle.

Fig. 2 shows a first embodiment of an executed as an additional handle 10 handle, as in Fig. 1 is used in a side sectional view with a fastener 12 and a handle member 14. The fastener 12 has in the present example, two sub-elements 12a, 12b. The grip element 14 is bow-shaped and has two end portions 16a, 16b. Each end region 16a, 16b comprises a connecting element 18a, 18b, which radially encloses a partial region 19a, 19b of a partial element 12a, 12b as a radial enclosing region of the fastening element 12. The radial enclosure in the end regions 16a, 16b is best in FIG Fig. 4a to recognize.

The auxiliary handle 10 further comprises a locking device 20 and a fixing device 22, which are arranged on the fastening element 12 of the auxiliary handle 10 and connected thereto. In particular, the locking device 20 and the fixing device 22 are enclosed by the two partial elements 12a, 12b of the fastening element 12.

The fastening element 12 comprises a fastening sleeve 24a, 24b in each end region 16a, 16b. The fastening sleeves 24a, 24b are surrounded by the respective associated connecting element 18a, 18b so that in each case a radial space 26a, 26b is formed. In each of these radial spaces 26a, 26b, a damping device 28a, 28b is provided.

The fastening sleeves 24a, 24b are each provided with an inner bore in the present example. The inner bores are coaxially oriented and serve to receive a clamping screw 30. The clamping screw 30 extends through the entire fastening element 12 and is received on its threaded side by a clamping nut 32 which is received in a locking knob 34 and rotatably connected thereto. The locking knob 34 thus forms an actuating element 36. In the present example, the clamping screw 30 is supported with its head via a contact disk 37 on the fastening sleeve 24a of the end portion 16a. The actuating element 36 is supported in the end region 16b directly on the mounting sleeve 24b. Preferably, a corresponding contact washer 37 is also provided in this end region 16b. It is also possible to form the contact disks 37 on the fastening sleeves 24a, 24b, in particular in each case in one piece with them. In an alternative embodiment, the support can also be made directly on the end faces of the sleeves, as shown by way of example in the end region 16b.

The locking device 20 comprises a toothing 38a, 38b provided on each fastening sleeve 24a, 24b. The teeth 38a, 38b are formed in the present example on a perpendicular to the clamping screw 30 oriented, inner end face of the mounting sleeves 24a, 24b.

The fixing device 22 comprises in the present example, a clamping band 40. With the clamping band 40, the auxiliary handle 10 can be attached to a machine housing 2 of a hand tool, not shown here and fixed. In its clamping region 42, the clamping band is provided with two clamping jaws 44a, 44b. In this case, the clamping band 40 can be received in correspondingly provided, not shown here, receiving openings in the clamping jaws 44a, 44b. Alternatively, the clamping jaws 44a, 44b may also be formed on the clamping band 40.

The clamping jaws 44a, 44b each have a bore for receiving the clamping nut 30. In the outwardly oriented surface area around the bores, the clamping backbones 44a, 44b each have depressions 46a, 46b. The depressions 46a, 46b interact with the teeth 38a, 38b of the fastening sleeves 24a, 24b in such a way that the fastening sleeves 24a, 24b are pivoted about the clamping screw 30 as pivot axis 48 with respect to alignment of the tension band and locked in the selected pivot position by tightening the clamping nut 32 can be.

If the clamping nut 32 is tightened, the clamping band 40 is clamped over the clamping jaws 44a, 44b at the same time, so that the auxiliary handle 10 is fixed to the machine housing of the power tool. When loosening the clamping screw 30, a circumferential position of the auxiliary handle 10 can be changed relative to the machine housing by turning the auxiliary handle 10 in a circumferential direction of the clamping band 40. By tightening the clamping nut 30, the auxiliary handle 10 is fixed in the new circumferential position.

A grip position of the grip element 14 can thus be optimally adapted to a work situation in two axes, so that the operator can comfortably guide the handheld power tool.

The abutment disc 37 ensures that no clamping forces 50a, 50b act on the damping devices 28a, 28b, so that their effectiveness does not depend on the currently applied tensioning forces 50a, 50b. Regardless of the clamping force 50a, 50b as well as the pivoting and circumferential position of the handle member 14, the damping devices 28a, 28b unfold their effects, so that occurring vibrations of the machine housing of the power tool largely independent of pivot and circumferential position of the auxiliary handle 10 damped on the handle member 14 are transmitted. In preferred embodiments, the damping devices 28a, 28b are designed so that the handle element 14, in particular in a working state in which the hand tool is pressed against the same by the operator with an insert tool for machining a workpiece, is largely isolated from the vibrations.

Preferably, a surface of the handle member 14 may be partially or completely provided with an elastic material, in particular an elastomer and / or a porous foam and / or an elastic fabric, to improve the damping properties and the ease of use.

In the following figures, the same effect, in particular the same features with the already known reference numerals.

In the Fig. 3a to 3d are two further developments of the auxiliary handle Fig. 2 shown. The show Fig. 3a and 3b a second embodiment and the Fig. 3c and 3d a third embodiment of an auxiliary handle 10, in which an area of action of the damping devices 28a, 28b is limited to a range of motion, in particular an angular range W in the pivoting direction about the rest position. The same reference numerals are used for the same elements.

Fig. 3a shows a side view of an additional handle 10, the handle member 14 oriented at its end portions 16a, 16b to the fastener 12 out parallel to a handle portion 52 of the handle member 14 inwardly oriented, wedge-shaped stop projections 54a, 54b.

The fastening sleeves 24a, 24b have radially oriented abutment recesses 56a, 56b in their cylindrical regions which carry the toothings 38a, 38b. The stop extensions 54a, 54b project with their fastening element 12 oriented free end in this stop recesses 56a, 56b. This is especially good in Fig. 3b to see which is a sectional view taken along the line B - B Fig. 3a shows. The abutment extensions 54a, 54b have two contact surfaces 58a, 59a, 58b, 59b along a longitudinal extent extending parallel to the pivot axis 48. The stop recesses 56a, 56b are distinguished by two stop faces 60a, 61a, 60b, 61b extending parallel to the pivot axis 48, which interact with the respective contact surfaces 58a, 59a, 58b, 59b in such a way that a pivoting movement of the grip element 14, in particular a pivoting movement Deflection of the handle member 14 from the rest position is limited to the angle range W. Each pair of abutment extension 54a, 54b and abutment recess 56a, 56b acts as a limiting means 62a, 62b, by which the elastic deflection of the pivot position is limited starting from the rest position. With this limiting means possible overloading of the damping device 28a, 28b, in particular by stretching and / or draft loads are largely prevented in a simple manner.

In the operation of a hand tool, in particular a drill and / or chisel hammer occur at least three different operating conditions, which is supported by an advantageous development of the handle according to the invention. In the working state, the handle is loaded by the operator in a pressure direction RD on the grip element 14, which is determined by a pressing of the insert tool against the workpiece. In this working condition, vibrations occur in the machine housing due to the effects of a drive device arranged in the machine housing for driving the insert tool and / or repercussions of a working process between the insert tool and the workpiece can be transferred to the handle. In a second operating state, which results in the transition from the working state to an idle state, and is referred to as a transition state, the hand tool is removed or released by a, applied by the operator on the handle tensile force from the workpiece. The direction of the tensile force can analogously be referred to as the pulling direction RZ on the handle element. Has the tool wedged in working condition, jammed or the like, are in the transition state sometimes considerable tensile forces in the pulling direction apply.

In an advantageous further development, the limiting means 62a, 62b of the auxiliary handle 10 are designed so that the elastic deflection of the pivot position starting from the rest position in one direction, preferably the pressure direction RD on the handle element, is greater than in an opposite direction, preferably the pulling direction RZ on handle element. As in Fig. 3b the stop extension 54a, 54b is shown asymmetrically in the angular range W of the stop recess 56a, 56b. In the present embodiment, the abutment surface 59a, 59b lying in the direction of pressing include an angle WD with the abutment surface 61a, 61b in the rest position shown. The oriented in the pulling direction abutment surface 58a, 58b include an angle WZ with the abutment surface 60a, 60b. The angle WD is made larger than the angle WZ. In a particularly preferred embodiment, the angle WZ is very small, preferably chosen to be almost equal to zero. By this choice of the angle WD and WZ, the elastic deflection of the pivot position from the rest position in the pressure direction RD on the handle element 14 can be significantly greater than in the direction of pull RZ on the handle element 14. In this way, the damping device 24a, 24b dampening vibrations in the working state while in Transient state the applied tensile force is largely exempt from damping losses.

In the Fig. 3c and 3d another embodiment of an auxiliary handle 10 is shown with a limiting means 62 for limiting the elastic deflection. In this case, stop extensions 54a ', 54b' are provided on the connecting elements 18a, 18b. In the embodiment shown, these stop projections 54a ', 54b' are arranged on the side facing away from the grip element 14 or the tension band facing side of the connecting elements 18a, 18b. The stop projections 54a ', 54b' are designed as hollow cylinder segments which extend parallel, preferably coaxially to the pivot axis 48 in the direction of the clamping jaws 44a, 44b. The fastening sleeves 24a, 24b each have a stop recess 56a ', 56b' which receive the stop projections 54a ', 54b', in particular in the circumferential direction. This is especially good in Fig. 3d to see. Analogous to the embodiment of Fig. 3b are at the abutment extensions 54a ', 54b' contact surfaces 58a ', 59a', 58b ', 59b' and to the Stop recesses 56a ', 56b' abutment surfaces 60a ', 61a', 60b ', 61b'. The already known embodiment Fig. 3a and 3b following, two different angles WD, WZ between the surface pairings of abutment surface 58a ', 58b' and abutment surface 60a ', 60b' or abutment surface 59a ', 59b' and stop surface 61a ', 61b' are formed in such a way that in the printing direction RD on the handle member a greater elastic deflection can be made from the rest position than in the pulling direction RZ on the handle element.

In addition to these embodiments of the limiting means 62, there are a wealth of other modifications that are obvious to those skilled in the art. Thus, among other things, variations result from the choice of the positioning of the stop projections 54a, 54b and stop notches 56a, 56b over the circumference of the connecting element 18a, 18b. Also, the assignments of the stop projections 54a, 54b and

Stop notches 56a, 56b to connecting element 18a, 18b and fastener 12 to be reversed. In addition, there are further modifications, which, however, do not influence the inventive idea.

All following FIGS. 4a to 7b show different embodiments of a damping device 28 for a handle according to the invention. In all the following figures, views of the fastening element 12 and connecting element 18 are shown in the end region 16 of the grip element 14, wherein the representation respectively shows the grip element 14 in the rest position. Since only one end region is shown in each case, the reference a or b is omitted in the following. Of course, the embodiments shown are suitable for both end portions 16a, 16b of a bow-shaped handle according to the invention. The illustrations are therefore not to be understood as limiting to handles with only one connecting element 18, but can be used regardless of the number of connecting elements 18 in this.

In the Fig. 4a to 4d four embodiments of a damping device 28 with an elastic member 64 are shown. The elastic member 64 is in the embodiments of Fig. 4a to 4d is designed as a spring element 66. The representations of the Fig. 4a to 4c show here sectional views of the handle according to the invention along the line A - A from Fig. 2 ,

In Fig. 4a the end portion 16 of a fourth embodiment is shown with the connecting element 18 which radially surrounds the fastening element 12. In a gap 67, which extends between the fastening element 12 and the connecting element 18, the damping device 28 is arranged. The Damping device 28 comprises a designed as a spring element 66 elastic element 64, which is designed as a leaf spring 68.

On an inner circumferential surface 70 of the connecting element 18, a radially inwardly oriented first hook element 71 is provided. On the fastening element 12, a radially outwardly oriented second hook element 73 is provided on an outer lateral surface 72. The leaf spring 68 is hooked with its first, designed as a radially outwardly directed hook end 74 on the first hook member 71. The second, designed as a radially inwardly directed hook end 75 of the leaf spring 68 is hooked to the second hook member 73. The leaf spring 68 extends radially about the fastening element 12 between its first end 74 and its second end 75. In the present example, in the rest position of the grip element 14 shown here, the leaf spring 68 completely encloses the fastening element 12 approximately once.

If the handle element 12 along in Fig. 4a If the directional arrows are deflected out of the rest position, the leaf spring 68 acts on the grip element 12 in a restoring manner. If vibrations occur on the machine housing during operation of the power tool, they are transmitted to the grip element 12 in a damped manner by the leaf spring 68.

In modifications of the damping device 28 according to the invention, the extent of the leaf spring 68 can be varied. In particular, it may be advantageous for the leaf spring 68 to surround the fastening element 12 two, three or more times.

In Fig. 4b the end region 16 of a fifth exemplary embodiment with a damping device 28 comprising a spring element 66 is shown. In this embodiment, the spring element 66 is designed as a helical compression spring 76.

Analogous to that Fig. 4a known embodiment, the connecting element 18 on its inner circumferential surface 70 with a first, radially inwardly directed support member 77 and the fastener 12 on its outer circumferential surface 72 with a second, radially outwardly directed support member 78 is provided. The support elements 77, 78 each have a contact surface 79, 80, which are oriented in the circumferential direction. The helical compression spring 76 is supported with its ends on a respective contact surface 79, 80.

In the embodiment shown here, the two support elements 77, 78 are arranged adjacent to one another, so that the helical compression spring 76 almost encloses the fastening element 12 in the rest position of the grip element 14. In addition, the two support elements 77, 78 executed radially overlapping, so that they act as a limiting means 62 at the same time. In particular, a deflection of the grip element 14 in the pulling direction RZ is limited to a small angle WZ. Preferably, the angle is WZ almost zero. In the compression direction RD, the helical compression spring 76 acts on the grip element 14 to damp vibrations which, starting from the machine housing, are transferred almost undamped to the fastening element 12.

Fig. 4c shows a further embodiment variant with a helical tension spring 82 as a spring element 66 as a sixth embodiment of a handle according to the invention. The helical tension spring 82 has two end regions 83, 83 '. In this embodiment, the hook or support elements 71, 72, 77, 78 each have a receiving element. At each receiving element an end portion 83, 83 'of the coil spring 82 is received and connected to the respective hook or support members 71, 72, 77, 78. In the embodiment shown here, the receiving elements are designed as receiving bores 84, 85. The end regions 83, 83 'of the helical tension spring 82 are hook-shaped, received in the receiving bores 84, 85 and hooked to the hook or support elements 71, 72, 77, 78. In a deflection of the handle member 14 from the rest position of this is offset by the coil spring 82 in the rest position. The mode of action is therefore analogous to the exemplary embodiments Fig. 4a and 4b ,

The skilled person are next to the here shown receiving holes 83, 83 'further suitable receiving elements known which can be used in a handle according to the invention for fastening the coil spring 82. Also, the helical tension spring 82 may be otherwise provided e.g. by gluing, clamping or similar processes to the hook or support elements 71, 72, 77, 78 are fastened.

In Fig. 4d an alternative embodiment of a damping device 28 is shown as a seventh embodiment. The figure shows a, parallel to the clamping screw 30 longitudinal section through a side view of an end portion 16. The elastic member 66 of the damping device 28 is designed here as a torsion spring 86 which surrounds the fastening sleeve 24 coaxially. The end portions of the torsion spring 86 are designed as insertion ends 87, 87 '. The connecting element 18 is provided with a frontal end 88, which extends perpendicular to the clamping screw 30. One of the torsion spring 86 facing end surface of the conclusion 88 has a Einsteckbohrung 90 for receiving the insertion end 87 of the torsion spring 86. The insertion hole 90 acts as a receiving element. The tooth surface facing away from the end face of the mounting sleeve 24 also has a Einsteckbohrung 90 ', which receives the second insertion end 87' of the torsion spring 86. If the grip element 14 is deflected out of its rest position about the pivot axis 48, the torsion spring 86 generates a restoring force. The mode of action is therefore analogous to the exemplary embodiments Fig. 4a to 4c ,

In addition to the insertion holes 90, 90 'shown here, the person skilled in the art is familiar with further suitable receiving elements which can be used in a handle according to the invention for fastening the torsion spring 86. Also, the torsion spring 86 may be otherwise provided e.g. be attached by gluing, clamping or similar processes on the fastener 12 and the connecting element 18.

An eighth embodiment of the handle according to the invention with a damping device 28 is shown in FIG Fig. 5a shown. In this embodiment, a rubber-elastic material 92 is inserted between the fastening sleeve 24 of the fastening element 12 and the connecting element 18. The rubber-elastic material 92 is connected to the outer circumferential surface 70 of the fastening sleeve and the inner lateral surface 72 of the connecting element 18. The connection can be made by mounting or vulcanization and / or gluing. An alternative connection provides surface structures on the inner and outer lateral surface 70, 72, to which a damping element 93 made of the rubber-elastic material 92 is inserted or used.

If the grip element 14 is deflected out of the rest position along the directions of the arrows, the rubber-elastic material 92 undergoes a torsion about the pivot axis 48, so that the deflection is only transmitted in a damped manner to the fastening element 12. The same applies if the fastening element 12 experiences forces due to transmitted vibrations. Also in this case, only a muted transfer to the grip element 14 takes place, so that the grip element 14 is largely decoupled from the vibrations.

Fig. 5b shows a ninth embodiment of an end portion 16 with a damping device 28. The fastening sleeve 24 in this case has a quadrangular outer contour 94. The connecting element 18 has a, also quadrangular inner contour 96. In the rest position of the grip element 14 shown, the outer contour 94 and the inner contour 96 are tilted relative to one another by an angle WK, preferably 45 °, relative to one another. A gap 98, which extends between the outer contour 94 and the inner contour 96, is filled with a porous material.

If the grip element 14 is deflected out of the rest position along the arrow directions, then the porous material 100 is compressed in a direction of rotation of the inner contour 96. As a result, the porous material 100 has a damping effect on the deflection.

Fig. 5c shows a tenth embodiment with a modification of the outer contour 94 and the inner contour 96. The mounting sleeve 24 in this case has a wing-shaped outer contour 94 '. The inner contour 96 'of the connecting element 18 is provided with two radially inwardly drawn protuberances 102. In the space between the fastening sleeve 24 and the connecting element 18 is a rubber-elastic material 92nd or a porous material 100 is provided as a damping element 66. The protuberances 102 each have a radial stop surface 104. In the rest position of the grip element 14 shown here, the wings 106 of the fastening sleeve 24 are positioned adjacent to the stop surfaces 104. As a result of this positioning, the damping element 66 acts asymmetrically on deflections on the grip element 14. If the grip element 14 is deflected along the direction of the arrow RD, which preferably corresponds to the pressure direction on the grip element 14, the deflection is transmitted only damped. However, acts a force in the direction of RZ, the damping element 66 is almost ineffective.

In the Fig. 6a and 6b show an eleventh and twelfth embodiment of an end portion with a damping device 28 of a handle according to the invention. The figure shows a section through the handle according to the invention along the line A - A from Fig. 2 , At the end region 16 of the grip element 14, the predominantly hollow cylindrical connecting element 18 is provided. The connecting element 18 encloses the fastening sleeve 24 of the fastening element 12, wherein a gap 108 between the inner circumferential surface of the connecting element 18 and the fastening sleeve 24 is formed.

The fastening sleeve 24 has four radially outwardly directed, evenly distributed over the circumference, lamellar radial extensions 110. On the inner lateral surface of the connecting element 18, four inwardly directed, evenly distributed over the circumference, lamellar radial projections 112 are provided. In the rest position of the gripping element 14 shown here, the inwardly directed radial extensions 112 are tilted by an angle WL in relation to the outwardly directed radial extensions 110 Fig. 6a is the angle WL in the rest position about 45 °.

In the intermediate space 108, an existing, an elastic material air spring 114 is also provided. The air spring 114 is designed here as a molded part, which has four radially inwardly directed grooves 116 and four radially outwardly directed grooves 118. The receiving grooves 116,118 are distributed uniformly over the circumference of the air spring 114 analogous to the radial projections, so that the inwardly directed receiving grooves 116 receive the inwardly directed radial extensions 112 and the outwardly directed receiving grooves 118, the outwardly directed radial extensions 110. In the intermediate spaces between the receiving grooves 116, 118, the air spring 114 has an open honeycomb structure 120 with air corrugations 122. About size and geometry of the air honeycomb 122, an elasticity of the air spring 114 can be selectively produced.

Acting along the direction arrows forces on the mounting sleeve 24 or the handle member 14, these forces are attenuated by the air spring 114 transmitted to the handle member 14 or the mounting sleeve 24.

If the radial extensions 110,112 radially overlap, as in the present example, then the alternating inwardly and outwardly directed radial extensions 110, 112 form a limiting means 62, which limits the elastic deflection of the pivoting position from the rest position to an angular range W.

By designing the angle WL, the elastic deflection of the pivoting position starting from the rest position in one direction can be carried out in a simple manner in a larger direction than in an opposite direction. Preferably, the elastic deflection in the pressure direction on the grip element 14 is significantly greater than in the pulling direction.

Fig. 6b shows a further possibility with which the elastic deflection of the pivoting position, starting from the rest position in one direction can be made greater than in an opposite direction. The honeycomb structure 120 of the air spring 114 has, starting from the inwardly directed radial extensions 112, an asymmetrical shape of the air cores 122. In the present example 112 air cells 122 are provided only one side of each radial extension. By this arrangement of the air corrugations 122, the air spring 114 acts in different pivoting directions with different elasticity.

In the Fig. 6a Radial projections 110, 112 shown are also suitable in combination with a porous material 100 for the production of a damping device 28, as shown in FIG Fig. 7a is shown. This embodiment can be considered as thirteenth embodiment. The mode of action is analogous to the action of the air spring 114 Fig. 6a , In the case of an elastic deflection from the rest position, the radial extensions compress the porous material 100 lying in front of these extensions in a direction of movement, as a result of which the movement undergoes damping.

Fig. 7b shows the already under Fig. 6a described possibility as a fourteenth embodiment by design of the angle WL, the elastic deflection of the pivot position starting from the rest position in one direction to be made greater than in an opposite direction.

Inventive damping devices 28 according to one of the examples Fig. 6a to 7b are not limited to the specific number of radial extensions 110, 112. In particular, the choice of a rubber-elastic material for the air spring or the porous material may require other numbers of radial extensions 110, 112. Also the Concrete shape of the radial extensions 110, 112 and their execution may vary without affecting the spirit of the invention.

Furthermore, it is conceivable that by combining two or more features of the embodiments described above, meaningful further developments of the handle result. In particular, a combination of a spring element 66 with a damping material appears to be an advantageous further development.

Claims (20)

1. Handle, in particular auxiliary handle (10), for guiding a portable power tool, having at least one fastening element (12, 12a, 12b) and a grip element (14) which is movable with respect to the fastening element (12, 12a, 12b), wherein the grip element (14) has at least one connecting element (18, 18a, 18b) which comprises a damping device (28, 28a, 28b) and via which the grip element (14) is connected to the fastening element (12, 12a, 12b) such that the grip element (14) is configured in a pivotable manner with respect to the fastening element (12, 12a, 12b), and wherein there is provided a locking device (20) which comprises an actuating element (34, 36) and by way of which the grip region (14) can be fixed releasably in a selectable pivoting position, wherein a selected pivoting position defines the rest position of the grip element (14) in relation to the fastening element (12, 12a, 12b) and the damping device (28, 28a, 28b) allows elastic deflection of the grip element (14) out of the rest position, characterized in that the connecting element (18, 18a, 18b) radially encloses the fastening element (12, 12a, 12b), and in that the damping device (28, 28a, 28b) is arranged between an inner lateral surface (70) of the connecting element (18, 18a, 18b) and an outer lateral surface (72) of the fastening element (12, 12a, 12b, 24, 24a, 24b) and operatively connects these together.
2. Handle according to Claim 1, characterized in that the damping device (28, 28a, 28b) has at least one elastic element (64), in particular a spring element (66, 68, 76, 82, 86, 114) and/or a rubber-elastic material (92) and/or porous material (100).
3. Handle according to Claim 2, characterized in that the elastic element (64) of the damping device (28, 28a, 28b) consists substantially of the rubber-elastic material (92) and/or porous material (100).
4. Handle according to Claim 2 or 3, characterized in that the elastic element (64) has a rubber-elastic material (92) which is vulcanized onto or adhesively bonded to the inner lateral surface (70) of the connecting element (18, 18a, 18b) and/or the outer lateral surface (72) of the fastening element (12, 12a, 12b, 24, 24a, 24b).
5. Handle according to one of the preceding claims, characterized by the provision of at least one, preferably two radially projecting bearing discs (37) which are arranged on the fastening element (12, 12a, 12b), are configured preferably in one piece with the latter, and axially border a radial enclosing region (19, 19a, 19b) of the fastening element (12, 12a, 12b).
6. Handle according to Claim 5 and one of Claims 2-4, characterized in that the elastic element (64) is arranged between the bearing discs (37) and is protected by the latter.
7. Handle according to one of the preceding claims, characterized in that the grip element (14) is configured in a bracket-like manner and, at the two end regions (16, 16a, 16b), has connecting elements (18, 18a, 18b) in two enclosing regions (19, 19a, 19b) which radially enclose the fastening element (12, 12a, 12b).
8. Handle according to Claim 7, characterized in that the enclosing regions (19, 19a, 19b) are constructed in a substantially similar, preferably identical manner.
9. Handle according to Claim 1, characterized in that the locking device (20) has a toothing (38) for locking.
10. Handle according to Claim 1 or 9, characterized by the provision of a limiting means (62) which limits the elastic deflection of the pivoting position out of the rest position to an angular range (W).
11. Handle according to Claim 10, characterized in that the limiting means (62) is configured such that the elastic deflection of the pivoting position starting from the rest position is greater in one direction, preferably a pushing direction (RD) at the grip element (14) than in an opposite direction, preferably a pulling direction (RZ) at the grip element (14).
12. Handle according to one of the preceding claims, characterized by the provision of a fixing device (22) for releasably fixing the handle to a housing (2) of the portable power tool, said fixing device being connected to the fastening element (12, 12a, 12b) of the handle.
13. Handle according to Claim 12, characterized in that the fixing device (22) can be closed and opened via the actuating element (34, 36).
14. Handle according to either of Claims 12 and 13, characterized in that the fixing device (22) comprises a clamping band (40), by way of which the handle is fixable to the portable power tool.
15. Handle according to Claim 14, characterized in that the clamping band (40) has depressions (46a, b) which interact with toothings (38) on the fastening element (12, 12a, 12b).
16. Handle according to one of Claims 12 to 14, characterized in that the fixing device (22) comprises a clamping screw (30) and the actuating element (34, 36) is configured substantially as a clamping nut (32).
17. Handle according to Claim 16, characterized in that the clamping nut (32) is supported on a bearing disc (37).
18. Handle according to one of Claims 1 to 3, characterized in that the elastic element (64) of the damping device (28, 28a, 28b) is in the form of an air spring (114) which has asymmetrically formed air cells (122) provided in particular only in a circumferential direction of the air spring (114).
19. Handle according to one of Claims 1 to 3, characterized in that in each case an intermediate space (108) is produced between the connecting elements (18, 18a, 18b) and the fastening elements (12, 12a, 12b), and in that radial protrusions (110, 112), which are directed in each case into the intermediate space (108), are provided on an inner lateral surface (70) of the connecting elements (18, 18a, 18b) and on an outer lateral surface (72) of the fastening elements (12, 12a, 12b, 24, 24a, 24b), wherein the angle (WL) between in each case one outwardly directed radial protrusion (110) and one inwardly directed radial protrusion (112) is greater in one circumferential direction of the elastic element (64) than in the opposite circumferential direction.
20. Portable power tool, in particular a rotary and/or demolition hammer (1), having a handle, in particular an auxiliary handle (10) according to at least one of the preceding claims.

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