EP3213879A1 - Vibration reducing auxiliary handle - Google Patents

Abstract

Additional handle (100) for an electric hand tool machine, comprising a gripping piece (10), a tensioning band unit (20) for attaching the auxiliary handle (100) to the handheld power tool and an adapter (30) arranged between the grip piece (10) and the tensioning band unit (20). in which the tensioning band unit (20) can be tensioned by turning the grip (10) in the clockwise direction (R) and by opposing rotation (L), in each case relative to a longitudinal axis (LA) of the grip (10), wherein the adapter (30 ) An outer sleeve (31) and a coaxially arranged and via an elastomer (33) at least partially within the outer sleeve (31) mounted inner sleeve (35), wherein the adapter (30) has a rotation stop (40) having a predetermined rotation (AD) between outer sleeve (31) and inner sleeve (35) in both directions of rotation (L, R) around the longitudinal axis (LA) hard limited.

Description

The present invention relates to an auxiliary handle for an electric hand tool, with a handle, a clamping band unit for attaching the auxiliary handle to the power tool and a arranged between the handle and the strap unit adapter. The tension band unit can be tensioned by turning the grip in a clockwise direction. A relaxation of the clamping band unit can be done by rotating the handle in the opposite direction of rotation. The direction of rotation in each case refers to a longitudinal axis of the handle.

Additional handles of the type mentioned are basically known from the prior art. They are used in electric hand tool machines, such as drills, hammer drills or combi hammer used.

It is an object of the present invention to provide an auxiliary handle which is comfortable and safe.

The object is achieved in that the adapter has an outer sleeve and a coaxially arranged and at least partially mounted inside the outer sleeve via an elastomer inner sleeve, wherein the adapter has a rotation stop, which has a predetermined rotation between the outer sleeve and inner sleeve in both directions of rotation about the longitudinal axis hard limited.

The invention includes the realization that elastomers as vibration-damping damping elements for additional handles for power tools, although in principle known from the prior art, but not with additional handles of the type mentioned.

Thus, the European patent publication EP 0 700 328 B1 For example, a vibration-absorbing handle for a power tool. From the German patent DE 34 15 255 C2 is described another vibration-damping handle for work machines. The German patent application DE 10 2007 047 083 A1 Finally, describes an auxiliary handle for a hand tool with at least one handle element and an insulating device with at least one damping element, wherein the insulating device has at least one hard stop cooperating with the grip element when the grip element is tilted.

In contrast to the additional handles of the prior art just described, the present invention designed additional handle allows easy and safe installation or disassembly on a device neck of an electric hand tool by the fact that an overload of the elastomer during rotation by means of the rotation stop is avoided. As a result, the auxiliary handle according to the invention is comfortable, that is, vibration-reducing, and at the same time safe, since a high service life of the elastomer is ensured by the protection of the elastomer. These advantages does not offer the additional handles known from the prior art.

It has been found to be advantageous if the adapter has a tilt stop, which limits a predetermined tilting between outer sleeve and inner sleeve transverse to the longitudinal axis hard. Thus, in an advantageous manner, a backup of the elastomer against excessive cardan tilting or too high axial forces can be avoided.

In a particularly preferred embodiment, the rotation stop and the tilt stop are formed together in functional integration. For the rotational stop and the tilt stop may have a common stop pin, which is on the one hand rigidly coupled to the inner sleeve. On the other hand, the stop pin can be arranged to be movable in a recess. Preferably, the stop pin is designed as a dowel pin. The stop pin can be oriented transversely, preferably perpendicular to the inner sleeve. These orientations are to be understood in each case with respect to the axis of rotation of the inner sleeve.

It has proven to be advantageous if the recess is formed as a groove. Preferably, the recess is formed as a groove extending in length parallel to the longitudinal axis within the adapter. A width of the groove is preferably oriented radially to the longitudinal axis. It has proven to be advantageous if the length of the groove is preferably ten times as large as the width of the groove. In a particularly preferred embodiment, two grooves, preferably exactly two grooves are arranged within the adapter. These may be arranged uniformly spaced around the longitudinal axis.

In an alternative preferred embodiment, the recess is provided as a bore in the outer sleeve.

It has proved to be advantageous if the adapter has a threaded bolt as a clamping anchor for the clamping band unit. Preferably, the threaded bolt is pressed into the inner sleeve.

As an alternative to the fact that the adapter has a threaded bolt as a tensioning anchor for the tensioning belt unit, the adapter can have a threaded sleeve for tensioning a threaded bolt encompassed by the tensioning belt unit. Preferably then the threaded sleeve is pressed into the inner sleeve.

It has been found to be advantageous if the stop pin has a pin diameter and the bore has a bore diameter and a radial clearance is provided around a located within the adapter end of the threaded bolt, whose width is greater than the difference between the bore diameter and pin diameter.

In a further preferred embodiment, the inner sleeve protrudes, based on the longitudinal axis, on one side or on both sides beyond the outer sleeve. If, for example, the inner sleeve projects beyond the outer sleeve on the side facing the tensioning strap unit, then the protruding inner sleeve can form an uprising for the tensioning strap unit. For example, if the inner sleeve protrudes beyond the outer sleeve on the side of the outer sleeve facing the handle, then this projection can define, for example, a radial free space.

It has been found to be advantageous that when mounted additional handle, the inner sleeve are rigidly connected to the clamping band unit and / or the outer sleeve rigidly connected to the handle.

Preferably, the tensioning band unit is rigidly connected to the inner sleeve via a threaded bolt as a tensioning anchor. The handle may be rigidly connected to the outer sleeve via a different threaded bolt, such as a hexagon screw.

In a preferred embodiment, the adapter is frusto-conical.

The elastomer is preferably specified for a maximum torque of 10 to 20 Newton meters between outer sleeve and inner sleeve, preferably 15 Newton meters specified.

Further advantages will become apparent from the following description of the figures. In the figures, various embodiments of the present invention are shown. The figures, 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.

In the figures, the same and similar components are numbered with the same reference numerals.

Fig. 1

ein erstes Ausführungsbeispiel eines erfindungsgemäßen Zusatzhandgriffs;

Fig. 2

einen Zusatzhandgriff mit Spannbandeinheit;

Fig. 3

eine perspektivische Darstellung eines Adapters des Ausführungsbeispiels aus Fig. 1;

Fig. 4

zwei Schnittdarstellungen des Adapters aus Fig. 3;

Fig. 5

ein alternatives Ausführungsbeispiel eines erfindungsgemäßen Zusatzhandgriffs;

Fig. 6

zwei Schnittdarstellungen des Ausführungsbeispiels aus Fig. 5.

Show it:

Fig. 1

a first embodiment of an additional handle according to the invention;

Fig. 2

an additional handle with strap unit;

Fig. 3

a perspective view of an adapter of the embodiment Fig. 1 ;

Fig. 4

two sectional views of the adapter Fig. 3 ;

Fig. 5

an alternative embodiment of an additional handle according to the invention;

Fig. 6

two sectional views of the embodiment of Fig. 5 ,

EXAMPLES

A first embodiment of an auxiliary handle 100 according to the invention is shown in FIG Fig. 1 shown. The auxiliary handle 100 has a handle 10. A tension band unit 20 included in the auxiliary handle is shown in FIG Fig. 1 not shown, but can, for example, the Fig. 2 be removed. The additional handle 100 in Fig. 1 has an adapter 30. The adapter 30 has an outer sleeve 31 and a coaxially arranged on an elastomer 33 in sections within the outer sleeve 31 mounted inner sleeve 35.

The adapter 30 has a rotation stop 40, which has a predetermined rotation AD (see. Fig. 4a ) between the outer sleeve 31 and inner sleeve 35 in both directions of rotation L, R hard around the longitudinal axis LA of the handle 10. Also included in the adapter 30 is a tilting stop 50, which has a predetermined tilting AK (cf. Fig. 4b ) between outer sleeve 31 and inner sleeve 35 transverse to the longitudinal axis LA hard limited.

The rotational stop 40 and the tilt stop 50 are formed together in functional integration and have for this purpose a common stop pin in the form of a clamping pin 45. The clamping pin 45 is on the one hand rigidly coupled to the inner sleeve 35, in the presently illustrated embodiment via a threaded bolt 34 which is pressed into the inner sleeve 35 and as a clamping anchor for the clamping band unit 20 (see. Fig. 2 ) serves. On the other hand, the clamping pin 45 is movable in a recess formed as a groove 37. Again Fig. 1 can be removed, the stop pin is oriented in the form of the clamping pin 45 perpendicular to the inner sleeve 35 and braced in a bore of the threaded bolt 34.

The exact function of the rotationally-engaged stopper 40 and the tilting stopper 50 formed together in functional integration will be described later with reference to FIG Fig. 4 explained in more detail.

First, but with respect to Fig. 2 briefly the function of the tension band unit 20 will be explained. The clamping band unit 20 is placed in the assembled state around the neck of a hand-held power tool, not shown here. Via a pressure piece 21, a disc 22 and a threaded bolt 34 'encompassed by the tensioning band unit, they are firmly connected to a threaded sleeve 36 encompassed by the adapter 30. The threaded sleeve 36 is firmly pressed into the inner sleeve 35. The forces and moments are elastically transmitted to the outer sleeve 31 via the elastomer 33.

The outer sleeve 31 is rotationally pressed in the present embodiment shown in the adapter 30. The adapter 30 in turn is connected via a threaded bolt 34 fixed to the handle 10.

Due to the V-shaped inner contour of a housing 23 of the tension band unit 20, the tension band unit 24 can be drawn into the housing 23 to a certain extent. As a result, the neck of the device (not shown) between clamping band 24 and a clamping segment 25 is braced. The housing 23 thus serves as a pressure support, while the clamping band 24 and the threaded bolt 34 ', in this case a hexagonal screw, are loaded in the mounted state to pressure.

A cocking in Fig. 2 shown clamping band unit 20 is effected by rotating the handle 10 in a clockwise direction R about the longitudinal axis LA. A relaxation of the tension band 24 of the tension band unit 20 takes place by turning the grip 10 in the opposite clockwise direction L about the longitudinal axis LA.

For reasons of simplicity, rotational stop 40 and tilt stop 50 are in FIG Fig. 2 not shown. These should now, however, with reference to Fig. 3 be explained in more detail. In addition shows Fig. 3 a perspective view of the adapter 30 of the embodiment Fig. 1 ,

Again Fig. 3 can be removed, the recess is provided in the form of two grooves 37 which extend their length LN parallel to the longitudinal axis LA within the adapter 30 and whose width BN is oriented radially to the longitudinal axis LA.

The elastomer 33 is specified in the present embodiment for a maximum torque between outer sleeve 31 and inner sleeve 35 of 15 Newton meters.

The adapter 30 has a threaded bolt 34 as a clamping anchor for the clamping band unit 20 (see. Fig. 2 ) on. The threaded bolt 34 is pressed in the present embodiment shown in the inner sleeve 35. The clamping pin 45 is made in one piece with the threaded bolt 34 as a special screw.

In the illustrated embodiment, the outer sleeve 31 is pressed into the adapter 30, so that slipping out of the outer sleeve 31 is avoided from the adapter 30. Alternatively or additionally, this may be, this is in Fig. 1 represented by a support disk 31 'be realized. Alternatively or additionally, an axial securing of the inner sleeve 35 in Adapter 30 by means of a screw 36, which is introduced transversely to the longitudinal axis. This will be with reference to the embodiment of Fig. 5 described later.

The two recesses formed as rectangular grooves 37 are in Fig. 3 good to see. The one-piece designed as a special screw with the threaded bolt 34 clamping pin 45 projects on both sides as a guide pin in a respective groove 37 a.

The function of the combined rotation stop tilt stopper 40, 50 will now be described with reference to FIG Fig. 4 explained exactly. In addition shows Fig. 4a a section through the adapter 30 in the longitudinal direction. In Fig. 4b is a section AA along the section line AA in Fig. 4a First, the function of the tilt stopper 50 will be described with reference to FIG. 4a.

For explanatory purposes, this is in Fig. 4a a tipping point KP drawn by a tilting AK to be adopted according to the indicated arrow. Such a gimbal can occur because the threaded bolt 34 is rigid with the tension band unit (see. Fig. 2 ) connected is.

In the Fig. 4a shown distances a, b, c of integrally formed with the threaded bolt 34 clamping pin to the groove define the maximum possible path, which is implemented by bending the elastomer 33 vibration-reducing. If the tilt AK maximum, the rigid dowel pin 45 is located on a stop surface 45 'in the adapter. Such a predetermined tilt AK between outer sleeve 31 and inner sleeve 35 is limited transversely to the longitudinal axis LA hard.

Regarding Fig. 4b Now, the rotation stop 40 will be explained. This is realized by the integrally formed with the threaded bolt 34 clamping pin 45 within the groove 37. An in Fig. 4b Plotted distance D defines a distance over which the clamping pin 45 can move in the radial direction within the groove 37. If the rotation AD around the pivot point DP is the maximum, a rotational stop 40 acting between the outer sleeve 31 and the inner sleeve 35 in both directions of rotation LR is realized in that the tensioning pin 45 abuts against the abutment surface 45 "which is formed by an inner side of the groove attached to this.

An alternative embodiment of the adapter 30 is shown in FIG Fig. 5 shown. In contrast to that from the FIGS. 1 . 3 , and 4 apparent embodiment, the recess in which the clamping pin 45 is movable, provided as a bore 39 in the outer sleeve 31.

An axial securing of the outer sleeve 31 in the adapter 30 is realized in the present embodiment by a screw 36 present a grub screw.

Through the interaction of the bore 39 and the tensioning pin 45, a rotation stop tilting stop 40, 50 which acts in functional integration is realized. Its function is now with reference to the Fig. 6 explained in more detail.

In addition shows Fig. 6a first a cross section along the longitudinal axis LA. Fig. 6b shows a sectional view AA along the in Fig. 6 a drawn section line AA.

Again Fig. 6 can be removed, the adapter 30 has a threaded bolt 34 as a clamping anchor for the clamping band unit 20 (see. Fig. 2 ) on. The threaded bolt 34 is pressed into the inner sleeve.

The stop pin provided as a clamping pin 45 is in turn clamped in the threaded bolt 34 and thereby rigidly coupled to the threaded bolt 34. By this rigid coupling of the clamping pin 45 is also coupled to the inner sleeve 35, since in this the threaded bolt 34 is pressed.

The hole 39 has a bore diameter BD, which is greater than a pin diameter SD of the clamping pin 45. To a located within the adapter 30 end of the threaded bolt 34, a radial clearance 38 is provided, whose width W38 is greater than the difference between the bore diameter BD and Pin diameter SD. As a result, the clamping pin is tilted both at a tilt AK around the tilting point KP (see. Fig. 6a ) as well as at a rotation AD about the pivot point DP (see. Fig. 6b ) movable.

The inner edge of the bore 39 defines a circumferential belt-shaped abutment surface 45 '"for the clamping pin 45. The belt-shaped stop surface 45''forms a hard stop both for a rotation AD between the outer sleeve 31 and inner sleeve 35 and for a tilt AK between the outer sleeve 31 and Inner sleeve 35. In this way, the rotation stop 40 and the tilt stop 50 are formed together in functional integration.

LIST OF REFERENCE NUMBERS

10

grip

20

Strap unit

21

Pressure piece

22

disc

23

casing

24

strap

25

clamping segment

30

adapter

31

outer sleeve

31 '

support disc

33

elastomer

35

inner sleeve

36

screw

34.34 '

threaded bolt

37

groove

38

radial clearance

39

drilling

40

rotary stop

45

dowel pin

45 ', 45 ", 45"'

stop surfaces

50

tilt stop

100

Additional handle

AD

twisting

AK

tilt

BD

Bore diameter

BN

width

DP

pivot point

EN

Width of the groove

KP

tipping point

L

Turn in the counterclockwise direction

LA

longitudinal axis

LN

Length of the groove

Q

transversely

R

clockwise

SD

Pin diameter

W38

Width of the radial clearance

Claims (11)

Additional handle (100) for an electric hand tool machine, comprising a gripping piece (10), a tensioning band unit (20) for fastening the auxiliary handle (100) to the hand tool machine and an adapter (30) arranged between the grip piece (10) and the tension band unit (20). wherein the tension band unit (20) can be tensioned by turning the grip piece (10) in the clockwise direction (R) and by opposing turning (L), in each case with respect to a longitudinal axis (LA) of the grip piece (10),
characterized in that the adapter (30) has an outer sleeve (31) and an inner sleeve (35) arranged coaxially therewith and at least partially within an outer sleeve (31) via an elastomer (33), wherein the adapter (30) has a rotation stop (30). 40) which limits a predetermined rotation (AD) between outer sleeve (31) and inner sleeve (35) in both directions of rotation (L, R) around the longitudinal axis (LA) hard. Additional handle (100) according to claim 1,
characterized in that the adapter (30) has a tilting stop (50) which limits a predetermined tilting (AK) between the outer sleeve (31) and inner sleeve (33) transversely (Q) to the longitudinal axis (LA) hard. Additional handle (100) according to claim 2,
characterized in that the rotation stop (40) and the tilt stop (50) are formed together in functional integration and for a common stop pin, preferably a clamping pin (45), on the one hand rigidly coupled to the inner sleeve (35) and on the other hand movable in a recess is, wherein the stop pin is oriented transversely, in particular perpendicular to the inner sleeve (35). Additional handle (100) according to claim 3,
characterized in that the recess is formed as a groove (37) extending its length (LN) parallel to the longitudinal axis (LA) within the adapter (30) and whose width (BN) is oriented radially to the longitudinal axis (LA) , Additional handle (100) according to claim 3,
characterized in that the recess is provided as a bore (39) in the outer sleeve (31). Additional handle (100) according to one of the preceding claims,
characterized in that the adapter (30) has a threaded bolt (34) as a clamping anchor for the clamping band unit (20), wherein the threaded bolt (34) is pressed into the inner sleeve (35). Additional handle (100) according to claim 6,
characterized in that the stop pin has a pin diameter (SD) and the bore has a bore diameter (BD) and a radial clearance (38) is provided around an end of the threaded bolt (34) located inside the adapter (30) whose width (W38) greater than the difference between bore diameter (BD) and pin diameter (SD). Additional handle (100) according to one of claims 6,
characterized in that the adapter (30) has a threaded sleeve (36) for clamping a threaded bolt (34 ') encompassed by the tensioning band unit (20), wherein the threaded sleeve (36) is pressed into the inner sleeve (35). Additional handle (100) according to one of the preceding claims,
characterized in that the inner sleeve (35), based on the longitudinal axis (LA) on one side or on both sides beyond the outer sleeve (31) protrudes. Additional handle (100) according to one of the preceding claims,
characterized in that when mounted additional handle (100), the inner sleeve (35) is rigidly connected to the clamping band unit (20) and / or the outer sleeve (31) rigidly connected to the handle (10). Additional handle (100) according to one of the preceding claims,
characterized in that the adapter (30) is frusto-conical.

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