WO2009083314A1

WO2009083314A1 - Auxiliary handle device

Info

Publication number: WO2009083314A1
Application number: PCT/EP2008/064864
Authority: WO
Inventors: Robert Simm; Aldo Di Nicolantonio; Roswitha Eicher; Stefan Heess; Joerg Maute; Florian Esenwein; Bernhard Eicher; Marcus Schuller
Original assignee: Robert Bosch Gmbh
Priority date: 2007-12-27
Filing date: 2008-11-03
Publication date: 2009-07-09
Also published as: DE102007062725A1

Abstract

The invention relates to an auxiliary handle device, particularly for a hand-held power tool (12a-d), comprising an auxiliary handle (14a-d) and a damping unit (16a-d) having at least one damping medium (18a, 20a; 18b, 20b; 18c; 18d, 20d). The invention is characterized in that the damping medium (18a, 20a; 18b, 20b; 18c; 18d, 20d) is at least in part a fibre composite.

Description

Auxiliary handle device

State of the art

The invention is based on an auxiliary handle device according to the preamble of claim 1.

There is already known an auxiliary handle device for a hand tool. The auxiliary handle device has an auxiliary handle and a damping unit with a damping means.

Advantages of the invention

The invention is based on an auxiliary handle device, in particular for a hand-held power tool, with an auxiliary handle and a damping unit which has at least one damping means.

It is proposed that the damping means is at least partially formed by a fiber composite. In this context, an "additional handle" of the auxiliary handle device is to be understood as an area and / or a component and / or an element, for the purpose of creating, in particular embracing, by one or more hands of an operator a guide of a power tool by means of the auxiliary handle device, is provided, and in particular next to another handle, in particular a main handle, in addition to the hand tool is attachable, wherein the additional hand grip device is arranged laterally on the hand tool and / or can be dismantled without tools by an operator on the power tool and / or arranged in a front, near the tool area of the power tool and / or the auxiliary handle is rod-shaped. Furthermore, a "fiber composite" is to be understood as meaning a composite of a plurality of individual fibers, which, viewed as a whole, has a substantially higher interconnectivity

Having stiffness than the individual fibers, wherein the individual fibers are preferably arranged at least partially movable in at least one direction to each other. The individual fibers can be arranged within the fiber composite, such as parallel to each other, or arranged randomly to each other. Preferably, by means of the fiber composite, a vibration damping by converting a vibration energy into an internal friction energy in a movement of the individual fibers to each other. The embodiment according to the invention makes it possible to achieve an advantageous damping of the auxiliary handle, in particular of a grip area, and thus a high level of operating comfort for an operator. The auxiliary handle device according to the invention is basically used in conjunction with all hand tool machines that appear useful to the person skilled in the art, in which, in particular, guidance of the handheld power tool by means of the auxiliary handle for an operator is facilitated. Due to its damping characteristic, the auxiliary handle device is particularly advantageous in connection with an angle grinder.

A particularly advantageous damping can be achieved if the fiber composite of a

Knitted fabric is formed. In this case, a "knitted fabric" is to be understood as meaning, in particular, a composite of a plurality of fibers, individual fibers having at least one intersection point with one another and preferably having a plurality of intersection points with one another.

Furthermore, it is proposed that the fiber composite is formed by a metal, whereby an advantageous stability of the damping means within the auxiliary handle device can be achieved.

Furthermore, an advantageous vibration damping can be achieved and a high level of operating comfort for an operator of the auxiliary handle device can be achieved if the fiber composite is formed by a mesh. In this context, a "braid" is to be understood in particular as a composite of a plurality of fibers, which are preferably arranged in an ordered manner, wherein individual fibers are advantageously combined into strands and the strands are looped into each other, such as a rope. Furthermore, it is proposed that the fiber composite is annular, whereby the most uniform possible vibration damping in a circumferential direction of the auxiliary handle can be advantageously achieved.

It is further proposed that the damping unit has at least two separately formed damping means, whereby a vibration damping of the damping unit can be achieved at separately formed vibration transmission areas within the auxiliary handle device.

In an advantageous embodiment of the invention it is proposed that at least one of

Damping means is formed by a swing leg. Furthermore, an "oscillating leg" is to be understood as meaning, in particular, a damping means which has a substantially smaller cross-sectional area than the auxiliary handle for vibration damping, wherein the cross-sectional area is preferably smaller by at least 10%, advantageously by at least 20% and particularly advantageously by at least 50% the transverse extent of the auxiliary handle, and / or the damping means web-shaped and / or cylindrical and is also preferably formed by a bridging element and between the auxiliary handle and a vibration transmitting component, such as a fastening unit, in particular along an axial direction or along a longitudinal extent of the Zusatzhandgriffvorrich- is arranged or stores the auxiliary handle against the component and thus a direct

Vibration transmission from the component to the auxiliary handle at least partially prevented. The inventive design of the auxiliary handle device allows at least partial vibration isolation of the auxiliary handle of the power tool by a transmission area is reduced in its cross-sectional area to a minimum. In addition, an advantageous transmission of a force is possible by means of the oscillating legs, which is exerted by an operator of the power tool on the auxiliary handle to a guide of the hand tool.

An advantageous vibration damping along a preferred direction of a vibration propagation within the auxiliary handle device, in particular along a longitudinal extent of the

Additional handle, can be achieved if at least one swing leg has a longitudinal extent, which is aligned substantially parallel to a longitudinal extent of the auxiliary handle. By "substantially parallel" in this case in particular an inclination of a maximum of ± 10 ° and particularly preferably ± 5 ° of the longitudinal extension of the oscillating leg relative to the longitudinal extension of the auxiliary handle.

In an advantageous development of the invention, it is proposed that the auxiliary handle device has a fastening unit which at least partially by means of at least one

Damping means is mounted relative to the auxiliary handle. In this way, an advantageous at least partial vibration decoupling between the auxiliary handle and the fastening unit, which is preferably provided for attachment to the power tool, can be achieved during operation of the power tool. In addition, an at least vibration-reduced and thus in particular exact guidance of the power tool in operation for a

Operator possible.

If a damping means is additionally provided for fastening the additional handle to the fastening unit, it is possible in particular to advantageously save further components for fastening the auxiliary handle to the fastening unit. In this context, "intended" should be understood to mean in particular specially equipped and / or designed.

It is further proposed that the auxiliary handle has an end region facing the fastening unit and the damping unit is arranged at least partially along an axial direction between the end region and the fastening unit, whereby the

Damping unit can be arranged at least partially along a path of a vibration propagation within the auxiliary handle device advantageously before the auxiliary handle, in particular in front of a handle portion of the auxiliary handle. An "axial direction" of the auxiliary handle should be understood to mean a direction of the additional handle, which is preferably aligned along a length of the auxiliary handle

"End region" in particular a region of the auxiliary handle are understood, which is arranged along the axial direction at one end of the auxiliary handle facing region and along the axial direction an extension of preferably not more than 20% and more preferably at most 10% of a longitudinal extent of the auxiliary handle includes.

In addition, it is proposed that the additional handle device has a securing element which secures the auxiliary handle to a fastening unit, whereby an advantageous, captive arrangement of the auxiliary handle with the fastening unit can be achieved. A particularly advantageous adaptation of a damping parameter of the damping unit during operation to a vibration behavior of the handheld power tool can be achieved if the securing element is provided for setting at least one damping parameter of the damping unit.

Furthermore, it is proposed that the auxiliary handle has a grip sleeve, which at least partially forms a Aufhahmebereich for the damping unit, whereby a structurally simple recording and a compact, especially space-saving arrangement of the damping unit can be achieved within the auxiliary handle device.

drawing

Further advantages emerge from the following description of the drawing. In the drawing exemplary embodiments of the invention are shown. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

Show it:

1 shows a hand tool with an additional handle device according to the invention in a schematic representation,

2 shows an additional handle device according to the invention with a damping unit in a schematic sectional view, FIG. 3 shows an alternative auxiliary handle device with a support element in a schematic sectional view,

4 shows an alternative auxiliary handle device with a fastening unit, which is screwed to the damping unit, in a schematic sectional illustration, and FIG. 5 shows an alternative auxiliary handle device with a damping unit, which has a plurality of oscillating legs, in a schematic sectional illustration, Description of the exemplary embodiments

FIG. 1 shows a hand-held power tool 12a formed by an angle grinder from above. The angle grinder comprises a housing 60a and a main handle 58a integrated in the housing 60a. The main handle 58a extends on a one of a

Cutting disc formed tool 62a opposite side 64a in the direction of a longitudinal direction 66a of the angle grinder. An auxiliary handle device 10a, which extends transversely to the longitudinal direction 66a of the angle grinder, is disposed on a front, tool-near region 68a of the angle grinder.

In Figure 2, the auxiliary handle device 10a is shown in a schematic side view. The auxiliary handle device 10a has an auxiliary handle 14a, a damping unit 16a and a fastening unit 44a. The fixing unit 44a has a bolt-shaped fixing member 70a provided for attachment to the portable power tool 12a, and a disk-shaped base member 72a formed integrally with each other. The

Damping unit 16a is provided during operation of the power tool 12a to a vibration damping and arranged along a path of a vibration transmission within the auxiliary handle device 10a in front of the auxiliary handle 14a. The damping unit 16a has two damping means 18a, 20a, each formed by a fiber composite, for vibration damping. The damping means 18a, 20a are of a knitted fabric 24a, 26a of a

Metal formed. In a further embodiment of the invention, it is also conceivable that at least one of the two damping means 18a, 20a is formed by a knitted fabric 24a, 26a with an elastomer core arranged therein and / or by a metal wool and / or other materials which the skilled person considers useful is.

One of the two damping means 18a is arranged along an axial direction 48a, 50a, which is aligned parallel to a longitudinal extent 42a of the auxiliary handle 14a, between an end portion 46a of the auxiliary handle 14a facing the fastening unit 44a and the fastening unit 44a or its disk-shaped base element 72a. By means of the damping means 18a, the fastening unit 44a is at least partially mounted in a vibration-decoupled manner relative to the auxiliary handle 14a, and direct vibration transmission during operation of the hand-held power tool 12a via the fastening unit 44a to the auxiliary handle 14a is prevented. To protect the damping means 18a, an annular edge 74a is arranged on the end region 46a of the auxiliary handle 14a facing the fastening unit 44a. The annular rim 74a is disposed in a radial direction 76a in an outer peripheral portion 78a of the end portion 46a and extends therefrom in the direction 48a of the mounting unit 44a. In addition to the end region 46a of the auxiliary handle 14a, the disk-shaped base element 72a of the fastening unit 44a also has an annular edge 80a for protecting the damping means 18a. This annular edge 80a is arranged on a radially outer edge region 82a of the base element 72a and extends from the base element 72a in the direction 50a of the auxiliary handle 14a. A longitudinal extent 84a of the annular edge 74a of the end portion 46a adds to a longitudinal extent 86a of the annular edge 80a of the

Base member 72a along the axial direction 48a, 50a is smaller than a longitudinal extent 88a of the damping means 18a, so that the two annular edges 74a, 80a along the axial direction 48a, 50a are spaced from each other and direct vibration transmission from the mounting unit 44a on the auxiliary handle 14a is prevented.

For an attachment or a captive arrangement of the fastening unit 44a with the auxiliary handle 14a, the auxiliary handle device 10a has a securing element 52a, which is arranged in the radial direction 76a in an inner, central region of the auxiliary handle device 10a. The damping means 18a arranged between the end region 46a facing the fastening unit 44a and the fastening unit 44a is arranged in a circumferential direction 90a about the securing element 52a, wherein the securing element 52a and the damping means 18a are arranged at a distance from one another in the radial direction 76a. The securing element 52a is formed by a screw and can be screwed to the fastening unit 44a. For this purpose, the fastening element 70a and the disk-shaped base element 72a have an opening 92a with an internal thread, which is arranged in an inner, central portion 94a along the radial direction 76a. For fastening the securing element 52a to the auxiliary handle 14a, the latter has a recess 98a arranged in an inner, middle subregion 96a in the radial direction 76a, through which the securing element 52a is guided. A screw head 100a of the securing element 52a is arranged on a side 102a of the end region 46a facing away from the fastening unit 44a. A cylindrical grip sleeve 54 of the auxiliary handle 14a includes, with a radially inwardly directed surface 104a, a receiving region 56a, which makes it possible to import the securing element 52a. The screw head 100a of the securing element 52a also has, in the radial direction 76a, a greater transverse extent than a transverse extent of the recess 98a of the end region 46a. In the receiving region 56a, the further damping means 20a of the damping unit 16a formed by the knitted fabric 26a are arranged. The damping means 20a is arranged between the screw head 100a of the securing element 52a and the side facing away from the fastening unit 44a side 102a of the end portion 46a along the axial direction 48a, 50a. The damping means 20a is annular and arranged in a circumferential direction 90a directly around the securing element 52a. In addition, the end region 46a with a securing element 52a in the radial direction 76a facing side 106a spaced from the securing element 52a, so that together with the damping means 20a direct vibration transmission from the mounting unit 44a via the fuse element 52a on the auxiliary handle 14a during operation of the power tool 12a is at least partially prevented.

During operation of the handheld power tool 12a, an operator can adjust a damping parameter of the damping unit 16a to a vibration behavior of the handheld power tool 12a by setting a distance equal to the longitudinal extent 88a of the damping means 18a between the attachment unit 44a and the end portion 46a of the auxiliary handle

14a in the axial direction 48a, 50a can be adjusted. For this purpose, the operator can be adjusted by turning the securing element 52a, such as by means of a screwdriver, which is insertable into the receiving area 56a, and thus a damping property, such as a bias, of the two damping means 18a, 20a can be set. A minimum distance is through the longitudinal extensions 84a, 86a of the two

Given edges 74a, 80a.

In the figures 3 to 5 alternative exemplary embodiments are shown. Substantially identical components, features and functions are basically numbered by the same reference numerals. To distinguish the embodiments, however, the reference numerals of the embodiments, the letters a to d are added. The following description is limited essentially to the differences from the exemplary embodiment in FIGS. 1 and 2, wherein reference can be made to the description of the exemplary embodiment in FIGS. 1 and 2 with regard to components, features and functions remaining the same.

In Figure 3, an alternative additional handle device 1 Ob is shown. The auxiliary handle device 10b has a damping unit 16b with two annular damping means 18b, 20b, an auxiliary handle 14b and a fastening unit 44b. In addition, the auxiliary handle device 10b has a bolt-shaped support element 108b, which extends along an axial Direction 48b, 50b extends through a receiving portion 56b of the auxiliary handle 14b. The receiving region 56b is enclosed by a surface 104b, which faces inward in the radial direction 76b, of a grip sleeve 54b of the auxiliary handle 14b. The support member 108b is formed integrally with a fixing member 70b of the fixing unit 44b. Furthermore, the support element 108b or the fastening unit 44b is firmly connected to the auxiliary handle 14b by means of the two damping means 18b, 20b formed by a respective fabric formed from metal 24b, 26b. For this purpose, the two damping means 18b, 20b are respectively arranged in the radial direction 76b between the support element 108b and the grip sleeve 54b. Along the axial direction 48b, 50b or a longitudinal extension 42b of the auxiliary handle 14b, the damping means 18b, 20b are arranged on end regions 46b, 110b of the auxiliary handle 14b, one of the two damping means 18b on the end region 46b facing the fastening unit 44b and the other of the two Damping means 20b is arranged at the end portion 110b facing away from the fastening unit 44b. The gripping sleeve 54b or the auxiliary handle 14b is mounted exclusively by means of the two damping means 18b, 20b with respect to the support element 108b or the fastening unit 44b, so that a direct transmission of vibration during operation of the power tool 12b is substantially prevented.

FIG. 4 shows an alternative auxiliary handle device 10c. The auxiliary handle device 10c has a damping unit 16c with a damping means 18c, an additional handle 14c and a fastening unit 44c. The auxiliary handle 14c has a grip sleeve 54c, which forms a receiving region 56c for the damping unit 16c with a radially inwardly facing surface 104c. For a delimitation of the receiving region 56c in an axial direction 48c, 50c or in a longitudinal extension 42c of the auxiliary handle 14c, the auxiliary handle 14c has a partition wall 114c in a central subregion 112c along the axial direction 48c, 50c. The receiving portion 56c for the damping unit 16c extends from the

Partition 114c in the direction 48c of the fastening unit 44c. The damping means 18c formed by a knitted fabric 24c fills the receiving area 56c. In this case, the fabric 24c formed from a metal is firmly connected to the grip sleeve 54c. Furthermore, the damping means 18c is fixedly connected to a bolt-shaped fastening element 70c of the fastening unit 44c. For this purpose, the fastening element 70c points in a projecting into the receiving area 56c

End portion 116c on a thread which is screwed to the damping means 18c. An attachment of the attachment unit 44c with the auxiliary handle 14c or a storage of the auxiliary handle 14c relative to the attachment unit 44c takes place exclusively by means of the damping means 18c, so that a direct contact between the attachment unit 44c and the accessory set handle 14c is prevented and thus the auxiliary handle 14c as possible vibration-decoupled compared to a hand tool 12c in operation. Furthermore, it is conceivable to adapt a damping parameter during a production process to a possible vibration behavior of the handheld power tool 12c by varying a density or pressure and / or a shape and / or a material of the knitted fabric 24c.

FIG. 5 shows an alternative auxiliary handle device 1 Od. The auxiliary handle device 10d has a damping unit 16d, an auxiliary handle 14d and a fastening unit 44d. The damping unit 16d has three mutually parallel damping means 18d, 20d, of which only two are visible in FIG. 5, each of which is a braid

28d, 30d are formed. The three damping means 18d, 20d are each formed by an oscillating leg 34d, 36d, wherein the oscillating legs 34d, 36d have a longitudinal extent 4d, which are aligned substantially in an axial direction 48d, 50d or along a longitudinal extent 42d of the auxiliary handle 14d. The vibrating legs 34d, 36d, which are formed by a respective plastic cable, are arranged along the axial direction 48d, 50d between one of the fastening units

44d facing end portion 46d of the auxiliary handle 14d and the fixing unit 44d or a disc-shaped base member 72d of the fixing unit 44d arranged. In addition, the damping means 18d, 20d are arranged pressed with the disk-shaped base element 72d of the fastening unit 44d with an end portion facing the fastening unit 44d and encapsulated by the auxiliary handle 14d with an end region facing the auxiliary handle 14d, so that a firm connection between the auxiliary handle 14d and the Fastening unit 44d by means of the damping unit 16d or the three damping means 18d, 2Od is reached.

Claims

claims

1. Auxiliary handle device, in particular for a hand tool (12a-d), with an auxiliary handle (14a-d) and a damping unit (16a-d), which at least one damping means (18a, 20a; 18b, 20b; 18c; 18d, 2Od) characterized in that the damping means (18a, 20a; 18b, 20b; 18c; 18d, 20d) is at least partially formed by a fiber composite.

2. ZusatzhandgriffVorrichtung according to claim 1, characterized in that the fiber composite of a knitted fabric (24a, 26a, 24b, 26b, 24c) is formed.

3. ZusatzhandgriffVorrichtung according to claim one of the preceding claims, character- ized in that the fiber composite is formed of a metal.

4. ZusatzhandgriffVorrichtung according to any one of the preceding claims, characterized in that the fiber composite of a braid (28d, 30d) is formed.

5. ZusatzhandgriffVorrichtung according to any one of the preceding claims, characterized in that the fiber composite is annular.

6. ZusatzhandgriffVorrichtung according to any one of the preceding claims, characterized in that the damping unit (16c) has at least two separately formed from each other damping means (18c, 20c).

7. ZusatzhandgriffVorrichtung at least according to claim 6, characterized in that, at least one of the damping means (18c, 20c) by a swing leg (34c, 36c) is formed.

8. ZusatzhandgriffVorrichtung at least according to claim 7, characterized in that at least one oscillating leg (34c, 36c) has a longitudinal extent (40c), which is aligned substantially parallel to a Längsersrawreckung (42c) of the auxiliary handle (14c).

9. auxiliary handle device according to one of the preceding claims, characterized by a fixing unit (44a-d), at least partially by means of at least one damping means (18a, 20a, 18b, 20b, 18c, 18d, 2Od) relative to the auxiliary handle (14a-c) stored is.

10. auxiliary handle device at least according to claim 9, characterized in that at least one damping means (18a, 20a; 18b, 20b; 18c; 18d, 2Od) for attachment of the auxiliary handle (14a-d) to the fastening unit (44a-d) is provided ,

11. Additional handle device according to claim 9, characterized in that the auxiliary handle (14a, 14d) has an end portion (46a, 46d) facing the fastening unit (44a, 44d) and the damping unit (16a, 16d) is at least partially along an axial direction (48a , 50a, 48d, 50d) is arranged between the end region (46a, 46d) and the fastening unit (44a, 44d).

12. auxiliary handle device according to one of the preceding claims, characterized by a securing element (52 a) which secures the auxiliary handle (14 a) to a fixing unit (44 a).

13. Additional handle device at least according to claim 11, characterized in that the securing element (52a) is provided for setting a damping parameter of the damping unit (16a).

14. Additional handle device according to one of the preceding claims, characterized in that the auxiliary handle (14a-c) has a grip sleeve (54a-c) which at least partially forms a receiving region (56a-c) for the damping unit (16a-c).

15. Hand tool, in particular an angle grinder, with a main handle (58a-d) and an auxiliary handle device (10a-d) according to any one of the preceding claims.