EP3990229A1

EP3990229A1 - Side handle for an electric hand-held power tool

Info

Publication number: EP3990229A1
Application number: EP20732231.4A
Authority: EP
Inventors: Daniela Lachica Koch; Philipp Amelung; Martin Siemen; Manuel Roelecke; Konstantin Wullbrandt; Tobias Ströer; Isabel Völz; Hui Sun; Dogukan Mintas; Michael Göttlinger; Julian Janke; Ernst-Rudolf Lübkert; Markus Sommer; Georg Kugelmann; Maximilian Kummer; Steffen Mucha; Silke Topp
Original assignee: Hilti AG
Current assignee: Hilti AG
Priority date: 2019-06-26
Filing date: 2020-06-16
Publication date: 2022-05-04
Anticipated expiration: 2040-06-16
Also published as: EP3756833A1; WO2020260071A1; CN113853278B; EP3990229B1; US20220241953A1; US11858109B2; CN113853278A

Abstract

The invention relates to a side handle for an electric hand-held power tool, the side handle having a gripping region, which is designed to be gripped by a user, and a clamping unit by means of which the side handle can be releasably fastened to a machine neck of the hand-held power tool, the clamping unit having an operating element by means of which the clamping unit can be tightened and slackened, and the operating element, when the clamping unit is in the tightened state, being substantially flush with the surface of the gripping region. The operating element is preferably designed as a clamping lever.

Description

Side handle for an electric hand tool

The present invention relates to a side handle for an electric hand tool machine. The side handle has a grip area designed for gripping by a user and a tensioning unit. The side handle can be releasably fastened to a machine neck of the handheld power tool by means of the clamping unit, the clamping unit having an operating element by means of which the clamping unit can be clamped and relaxed.

Side handles of the type mentioned are basically known from the prior art. EP 1 974 867 B1 discloses a handle for a hand-held tool with a pair of clamping halves, an operating device which has an operating part which is suitable for opening and closing the clamping halves relative to the holding part, and a handle body which can be gripped by an operator configured.

The object of the present invention is to provide an ergonomic side handle.

The object is achieved in that the operating element, when the clamping unit is in the clamped state, is essentially flush with the surface of the grip area. Thanks to the control element designed according to the invention, the side handle, in particular its grip area, can be gripped particularly comfortably by a user who is now advantageously not hindered by an operating part protruding beyond the grip area, such as knurled knobs known from the prior art. At the same time, a tensioning screw typically used for tensioning can be made comparatively short, whereby both material savings and weight savings can be achieved.

It has been found to be advantageous if the operating element is designed as a tensioning lever. In a particularly preferred embodiment, the tensioning lever is arranged on the side handle so that it can rotate about an axis of rotation with respect to the grip area. The axis of rotation preferably runs perpendicular to a working axis of the handheld power tool when the side handle is attached to the handheld power tool. In a further particularly preferred embodiment, the rotation of the clamping lever about the axis of rotation is limited to 360 degrees, preferably to 180 degrees. In this regard, it was recognized that side handles of the prior art, typically a repeated, tedious turning of the operating part is required in order to adjust and move the side handle to the desired position both around the working axis of the handheld power tool and in the tilting axis. In other words, in the case of side handles of the prior art, a tensioning strap must be rotated several times, ie by more than 360 degrees, by a tensioning screw that interacts with the operating part.

According to a further preferred embodiment, the rotation of the clamping lever about the axis of rotation is limited to 340 degrees. As a result, the tension band holders can be moved further away from one another or pushed away, so that assembly and also disassembly of the side handle on or from a handheld power tool is facilitated.

It has been found to be advantageous if a stop is formed on the tensioning lever, which stop is preferably formed complementary to a counter-stop provided on the grip area. The grip area can have a hollow profile or can essentially be formed by such a profile.

The clamping unit can have two cylindrical section-shaped clamping bodies which are each oriented coaxially to a clamping screw of the clamping unit running in the axis of rotation. The tensioning unit preferably has a tensioning strap holder and a tensioning strap intended to encompass the machine neck. Preferably, one of the cylindrical section-shaped clamping bodies is designed in one piece with the clamping lever or at least connected to it in a rotationally fixed manner. The strap holder can have two holding bodies, preferably exactly two holding bodies. The clamping screw can be connected to the clamping lever in a rotationally fixed manner, for example via a hexagon.

In a particular embodiment, the tension band is hooked or can be hooked into the tension band holder. Advantageously, the tensioning band is free of a through-hole intended for a tensioning screw. This has the advantage that the side handle can be preassembled at the factory only by unhooking and re-hanging the tensioning strap on handheld power tools whose tool holder has a larger diameter than their machine neck. In the case of side handles of the prior art, under such circumstances, an essentially complete dismantling of the side handle, but at least the clamping unit, is typically necessary. Due to the advantageous embodiment of the tensioning strap holder with a suspending tensioning strap, time savings and thus also cost savings can be achieved during assembly. It has also been found to be advantageous if the tensioning strap holder has a recess set back in the radial direction with a retaining lug such that instead of the attached tensioning strap with a first diameter, a second tensioning strap with a second diameter different from the first can be suspended. The retaining lug can have a spring contact surface, the curvature of which is greater than a clamping surface of the clamping band holder that is in contact with the machine neck. One and the same clamping bracket holder can advantageously be used for hand-held power tools with different machine neck diameters. Advantageously, a system comprising a side handle with a plurality of tightening straps of different diameters is provided, each of the tightening straps being able to be suspended in one and the same tightening strap holder.

In a further preferred embodiment, the tensioning spell holder has two holding bodies lying coaxially to one another, at least one of the holding bodies being able to be braced with one of the cylindrical section-shaped tensioning bodies via a cone-hollow cone pairing. A second of the holding bodies can be braced with a handle end piece of the side handle via a cone-hollow cone pairing. The handle end piece can be designed in one piece with a handle area. The cone-hollow cone pairing can be assigned a cone formed on the second clamping body and / or a hollow cone formed on the first holding body, or vice versa. A cone-hollow cone pairing can be provided between the handle end piece and the second holding body.

On a side facing the machine neck, the clamping spell holder can have at least one surface section which, in relation to the remaining part of the clamping holder, has an increased coefficient of friction and / or an increased modulus of elasticity.

According to a further independent subject matter of protection, a side handle is provided for an electric handheld power tool, the side handle having a grip area designed for gripping by a user and a clamping unit, by means of which the side handle can be releasably attached to a machine neck of the handheld power tool, the clamping unit having an operating element by means of which the clamping unit can be tensioned and relaxed. The tensioning unit furthermore has a tensioning strap holder and a tensioning strap provided for embracing the machine neck, the tensioning strap being suspended in the tensioning strap holder and preferably free of a through-hole intended for a tensioning screw. The tightening strap holder can have a recess set back in the radial direction with a retaining lug such that instead of the suspended tightening strap with a first diameter, a second tightening strap with a second one different from the first Diameter can be suspended, the retaining lug preferably having a spring contact surface, the curvature of which is greater than a clamping surface of the clamping band holder which is in contact with the machine neck. The side handle can be designed in a corresponding manner by the features described with reference to the exemplary embodiments of the side handle according to the invention.

According to a further independent subject matter of protection, a side handle is provided for an electric handheld power tool, the side handle having a grip area designed for gripping by a user and a clamping unit, by means of which the side handle can be releasably attached to a machine neck of the handheld power tool, the clamping unit having an operating element by means of which the clamping unit can be tensioned and relaxed. On a side facing the machine neck, the tensioning strap holder can have at least one surface section which, in relation to the remaining part of the tensioning holder, has an increased coefficient of friction and / or an increased modulus of elasticity. The side handle can be designed in a corresponding manner by the features described with reference to the exemplary embodiments of the side handle according to the invention.

According to a further independent subject matter of protection, a side handle is provided for an electric handheld power tool, the side handle having a grip area designed for gripping by a user and a clamping unit, by means of which the side handle can be releasably attached to a machine neck of the handheld power tool, the clamping unit having an operating element by means of which the clamping unit can be tensioned and relaxed. The tensioning unit can have two cylindrical section-shaped tensioning bodies, each of which is oriented coaxially to a tensioning screw of the tensioning unit running in the axis of rotation, and also have a tensioning bracket holder with two holding bodies lying coaxially to one another, at least one of the holding bodies being paired with one of the cylindrical section-shaped ones via a cone-hollow cone pairing Clamping body is braced. The side handle can be designed in a corresponding manner by the features described with reference to the exemplary embodiments of the side handle according to the invention.

Further advantages emerge from the following description of the figures. Various exemplary embodiments of the present invention are shown in the figures. 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 useful further combinations. In the figures, the same and similar components are numbered with the same reference symbols. Show it:

Fig. 1 a first preferred embodiment of a side handle according to the invention;

Fig. 2 a second preferred embodiment of a side handle according to the invention;

3 shows detailed representations of the exemplary embodiment in FIG. 2; and

FIG. 4 shows further detailed representations of the exemplary embodiment in FIG. 2.

Execution for board:

A preferred exemplary embodiment of a side handle 100 according to the invention for an electric handheld power tool 200, for example a hammer drill, is shown in FIG. 1. The side handle has 100 a handle area 10 designed to be gripped by a user and a clamping unit 20, by means of which the side handle 100 can be releasably attached to a machine neck 210 of the handheld power tool 200. The tensioning unit 20 has an operating element designed as a tensioning lever 15 by means of which the tensioning unit 20 can be tensioned and relaxed, FIG. 1A showing the tensioned state SZ and FIG. 1B showing the relaxed state EZ.

When the clamping unit 20 is in the clamped state SZ, the operating element designed as a clamping lever 15 is flush with the surface, or at least essentially flush with the surface of the grip area 10. The clamping lever 15 is arranged on the side handle 100 so that it can rotate about a rotation axis DA with respect to the grip area 10, wherein the axis of rotation DA runs perpendicular to a working axis AA of the handheld power tool 200 when the side handle 100 is attached to the handheld power tool 200.

The grip area 10 can for example consist of polypropylene, ABS, polyamide or polyurethane or have such. The tensioning lever 15 can consist of the same material as the grip area 10. The tensioning lever 15 can consist of a thermoplastic elastomer (TPE) or have one.

The tensioning unit 20 of the exemplary embodiment in FIG. 1 has two cylindrical section-shaped tensioning bodies 21, 23 which are each oriented coaxially to a tensioning screw 25 of the tensioning unit 20 running in the axis of rotation DA. As can be seen from Fig. 1B, the clamping bodies 21, 23 are designed to be complementary to one another, i.e. they essentially form a cylinder when they lie on top of one another with a minimal length (FIG. 1 B), the clamping bodies 21, 23 essentially completely touching one another along the wave profile W. The wave profile W does not necessarily have to have a straight section; rather, as in the exemplary embodiment in FIG. 1, it can have a somewhat sinusoidal profile. The clamping lever 15 and the first clamping body 21 can be formed integrally with one another.

As can be seen from FIG. 1, the tensioning unit 20 also has a tensioning band holder 28 and a tensioning band 29 provided for encompassing the machine neck 210. The tensioning spell holder 28 has two holding bodies 31, 33 lying coaxially to one another, to which the tensioning band 29 is attached. Both between the second clamping body 23 and the first Holding body 31, as well as between the second holding body and a handle end piece 11, a crown toothing KR is provided, which prevents rotation of the handle area 10 about the axis of rotation DA when the clamping unit is in the clamped state SZ as shown in FIG. 1 A) . In the clamped state SZ, the clamping bodies 21, 23 - with reference to FIG. 1 B) rotated by 180 degrees about the axis of rotation to one another - lie on one another with a maximum length. In other words, a rotation of the tensioning lever by 180 degrees is sufficient to tension or relax the tensioning unit 20. Other wave profiles are possible.

A second preferred embodiment of a side handle 100 according to the invention is shown in FIG. FIG. 2B) shows a plan view coaxial to the working axis AA and FIG. 2B) shows a section which runs through the axis of rotation DA.

When the tensioning unit 20 is in the tensioned state SZ, the operating element embodied as a tensioning lever 15 is flush with the surface, or at least essentially flush with the surface of the grip area 10. Both FIGS. 2A and 2B show the tensioned state SZ. In addition to the tensioning lever 15 shown in FIG. 1, a stop 27 is formed on the tensioning lever 15 of the exemplary embodiment in FIG. 2, which is formed complementary to a counter-stop 17 provided on the handle area 10. The stop 27 is formed by a recess at the outer end of the clamping lever 15, which can be clearly seen, for example, from FIG. 4A. The complementary counterstop 17 is designed in one piece with the grip area 10. The stop 27 allows the clamping lever to be unscrewed about the axis of rotation in only one direction (out of the plane of the figure in FIG. 2). At the same time, a rotation of the tensioning lever 15 about the axis of rotation DA by the stop 27 is mechanically limited to 360 degrees, here for example to less than 360 degrees.

The clamping unit 20 has two cylindrical section-shaped clamping bodies 21, 23, which are each oriented coaxially to a clamping screw 25 of the clamping unit 20 running in the axis of rotation DA. The first tensioning body 21 is located completely within a volume V of the side handle, whereas the second tensioning body 23 protrudes beyond the volume V along the axis of rotation DA, at least in sections in the tensioned state SZ.

The tensioning unit 20 of the side handle of FIG. 2 also has a tensioning strap holder 28 and a tensioning strap 29A, 29B provided to encompass the machine neck 210, the tensioning strap 29A, 29B being suspended in the tensioning strap holder 28 and preferably free of a through-hole intended for a tensioning screw 25 is trained. This can be seen clearly in FIG. 2 B). Due to the possibility of hooking in the tensioning straps 29A, 29B and, in particular, dispensing with any ones intended for a tensioning screw 25 Through bores, the tensioning straps 29A, 29B can be exchanged comparatively easily - with the side handle 200 otherwise fully assembled.

The tension band holder 28 of FIG. 2 is advantageously designed both as a tension band 29A with a small diameter D1 and a tension band 29B with a large diameter D2. In FIG. 2, both tensioning straps 29A, 29B are shown simultaneously in order to make it clear that both tensioning straps 29A, 29B can be suspended in one and the same tensioning strap holder 28, more precisely in a retaining lug 26 of the tightening strap holder 26. Of course, only one of the tensioning straps 29A, 29B is installed during use.

The tightening strap holder 28 has a recess 24 set back in the radial direction RR with a retaining lug 26, which can be clearly seen in the detailed illustration of FIG. 3B. The retaining lug 26 is designed in such a way that instead of the suspended tensioning band 29A with the first diameter D1, the second tensioning band 29B with the second diameter D2 different from the first can be suspended. For this purpose, the retaining lug 26 has a spring contact surface 22 (cf. FIGS. 3A and 3B), the curvature K1 of which is greater than a curvature K2 of a clamping surface 30 of the clamping band holder 28 that is in contact with the machine neck 210 how the tension band 29B with a large diameter clings to the spring contact surface 22 of the retaining lug 26.

Back to FIG. 2 in which it can be clearly seen that the tensioning spell holder 28 has two holding bodies 31, 33 lying coaxially to one another. A first of the holding bodies 31 can be tensioned via a cone-hollow cone pairing 35 with one of the cylindrical section-shaped tensioning bodies 23 (which protrudes at least in sections in the tensioned state SZ along the axis of rotation DA beyond the volume V) (cf. also FIG. 3A). In the same way, such a cone-hollow cone pairing 35 can be provided between the second holding body 33 and a handle end piece 11. In the exemplary embodiment in FIG. 2, the handle end piece 11 is formed in one piece with the handle 10. Alternatively, the handle end piece 11 and the handle can be different parts.

The cone-hollow cone pairing 35, to which a cone 35A formed on the second clamping body 23 and a hollow cone 35B formed on the first holding body 31 is assigned, will now be explained in more detail with reference to FIG. 3A. The cone-hollow cone pairing 35 enables the handle 10 to pivot continuously about the axis of rotation DA. This is in contrast to a crown toothing KR provided in the exemplary embodiment in FIG. 1. The cone-hollow cone pairing 35 enables the clamping unit 20 to be braced independent of wear, since the non-positive cone-hollow cone pairing 35 adjusts itself automatically in the direction of the axis of rotation DA in the event of any wear. Alternatively to a stepless one In the configuration of the cone-hollow cone pairing 35, the cone 35A and / or the hollow cone 36B can be chamfered. For example, the hollow cone 35B, which can be clearly seen in FIG. 4C, has eight conical flanks 35F.

3B shows a holding body 31, 33 as part of the tensioning strap holder 28. The recess 24 formed there and the function of the holding lug 26 have already been explained above. The holding body 31, 33 has, on a side facing the machine neck 210, at least one surface section OF which, based on the remaining part VT of the tensioning strap holder 28, has an increased coefficient of friction. For example, the holding body 31, 33 can essentially consist of its comparatively hard ABS plastic and the surface section OF can consist of a comparatively soft thermoplastic elastomer or another rubber-like material. This in order to compensate for any tolerances between the machine neck and the tension band holder or to increase the friction between these components. Alternatively, a first and a second recess can be provided at the ends of the tensioning strap 29. A first holding element is positioned through the first recess and a second holding element is positioned through the second recess. Both the first and the second holding element are connected to the tensioning strap 29 by a clip mechanism. In addition, each retaining element is made from acrylonitrile butadiene rubber. Acrylonitrile butadiene rubber can also be referred to as nitrile rubber (AB) or nitrile butadiene rubber (NBR).

Finally, FIG. 4 shows detailed views of the side handle 100, the tensioning lever 15 being in different rotational positions. 4A shows the tensioned state SZ in which the tensioning lever is deflected by 0 degrees and thus the stop 27 formed on the tensioning lever rests on the complementary counter-stop 17, which is formed in one piece with the handle 10. The second clamping body 23 and the first holding body 31 (and not shown here, the second holding body 33 and the handle end piece 1 1) are pressed against one another, so that the handle area 10 cannot be rotated about the axis of rotation DA.

4B shows the relaxed state SZ in which the tensioning lever is deflected by 180 degrees. The second clamping body 23 is spaced apart from the first holding body along the axis of rotation DA. The grip area 10 can be rotated or pivoted about the axis of rotation DA as desired. At the same time, the entire side handle can be rotated or pivoted about the working axis AA of a handheld power tool, not shown here. Likewise, the entire side handle cannot be rotated or pivoted about the working axis AA of a handheld power tool, not shown here. Finally, FIG. 4C shows the relaxed state SZ in which the clamping lever is deflected by 270 degrees. The second clamping body 23 is spaced further apart from the first holding body along the axis of rotation DA compared to FIG. 4B. In the state shown in Fig. 4C, the side handle can be removed from the machine neck, not shown here.

Reference list

10 grip area

1 1 grip end piece

15 tension levers

17 counter stop

20 clamping unit

21 first clamping body

22 spring contact surface

23 second clamping body

24 deepening

25 clamping screw

26 retaining lug

27 stop

28 strap holders

29 strap

29A small diameter tightening strap

29B large diameter strap

30 clamping surface

31 first holding body

33 second holding body

35 Cone-hollow cone pairing

35A cone

35B hollow cone

35F tapered flanks

100 side handle

200 electric hand machine tool

210 machine neck

AA working axis

DA axis of rotation

D1 first diameter

D2 second diameter

EZ relaxed state

KR crown teeth

K1 first curve

K2 second curve OF surface section RR radial direction SZ stressed state

VT remaining part V volume

W wave

Claims

1 . Side handle (100) for an electric hand tool (200), the side handle (100) having a handle area (10) designed for gripping by a user and a clamping unit (20) by means of which the side handle (100) is attached to a machine neck (210) the handheld power tool (200) can be releasably attached, the clamping unit (20) having an operating element by means of which the clamping unit (20) can be clamped and relaxed,

characterized in that the operating element, when the clamping unit (20) is in the clamped state (SZ), is essentially flush with the surface of the grip area (10).

2. side handle (100) according to claim 1,

characterized in that the operating element is designed as a tensioning lever (15).

3. side handle (100) according to claim 2,

characterized in that the clamping lever (15) is arranged on the side handle (100) so as to be rotatable about an axis of rotation (DA) with respect to the grip area (10), the axis of rotation (DA) running perpendicular to a working axis (AA) of the handheld power tool (200), when the side handle (100) is attached to the hand machine tool (200).

4. side handle (100) according to claim 3,

characterized in that a rotation of the clamping lever (15) about the axis of rotation (DA) is limited to 360 degrees, preferably to 180 degrees.

5. side handle (100) according to claim 4,

characterized in that a stop (27) is formed on the tensioning lever (15), which is preferably designed to be complementary to a counter-stop (17) provided on the grip area (10).

6. side handle (100) according to one of the preceding claims,

characterized in that the clamping unit (20) has two cylindrical section-shaped clamping bodies (21, 23) which are each oriented coaxially to a clamping screw (25) of the clamping unit (20) running in the axis of rotation (DA).

7. side handle (100) according to one of the preceding claims,

characterized in that the tensioning unit (20) further comprises a tensioning strap holder (28) and a tensioning strap (29A) provided for embracing the machine neck (210), the tensioning strap (29A) preferably being suspended in the tensioning strap holder (28) and preferably free of one for a clamping screw (25) certain through hole (26) is formed.

8. side handle (100) according to claim 8,

characterized in that the tensioning strap holder (28) has a recess (24) set back in the radial direction (RR) with a retaining lug (26) such that instead of the attached tensioning strap (29A) with a first diameter (D1), a second Tensioning strap (29B) with a second diameter (D2) different from the first can be suspended, the retaining lug (26) preferably having a spring contact surface (22), the curvature (K1) of which is greater than a curvature (K2) of the machine neck (210) in contacting clamping surface (30) of the clamping band holder (28).

9. side handle (100) according to one of claims 6 to 8,

characterized in that the tensioning spell holder (28) has two holding bodies (31, 33) lying coaxially to one another, at least a first of the holding bodies (31) being braced with one of the cylindrical section-shaped tensioning bodies (23), preferably via a cone-hollow cone pairing (35) is.

10. Side handle (100) according to one of claims 7 to 9,

characterized in that the tensioning strap holder (28) and / or the holding body (31, 33), on a side facing the machine neck (210), has at least one surface section (OF) which, based on the remaining part of the tensioning holder (VT) , an increased coefficient of friction and / or an increased modulus of elasticity.