EP2981395A1

EP2981395A1 - Tool attachment for a hand-held power tool

Info

Publication number: EP2981395A1
Application number: EP14713817.6A
Authority: EP
Inventors: Jens Blum; Heiko Roehm; Joerg Welke; Dietmar Saur; Tobias Herr
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2013-04-03
Filing date: 2014-03-26
Publication date: 2016-02-10
Anticipated expiration: 2034-03-26
Also published as: WO2014161752A1; EP2981395B1; CN105102190A; DE102014205555A1; US10259111B2; US20160346911A1; CN105102190B

Abstract

The invention relates to a tool attachment (300) for a hand-held power tool, which hand-held power tool has a housing having a fastening interface. The tool attachment comprises an attachment housing (305), on which a locking unit (350) for locking the tool attachment (300) to the fastening interface of the hand-held power tool and a tool receptacle (340) for receiving an insertion tool are arranged. An impact unit (320) is arranged in the attachment housing (305), which impact unit is designed to apply impacts performed in the axial direction of the tool receptacle (340) to the insertion tool during impact operation of the tool attachment (300).

Description

Description title

Tool attachment for a hand tool state of the art

The present invention relates to a tool attachment for a hand tool, which has a housing with a mounting interface, with an attachment housing, on which a locking unit for locking the tool attachment to the attachment interface of the power tool and a tool holder for receiving an insert tool are arranged.

Such a tool attachment provided with a tool holder is known from WO 2008/068100 A1, which has a locking unit for locking on a fastening interface of a hand-held power tool machine designed in the manner of a screwdriver, drill or drill. The locking unit serves to allow mounting or removal of the tool attachment to or from the power tool in an unlocked state and to lock in a locking state the tool attachment for operation on the power tool.

A disadvantage of the prior art is that such a tool attachment is limited or not at all suitable for drilling in hard rock or concrete.

Disclosure of the invention

An object of the invention is therefore to provide a new tool attachment, which can also be used for drilling in hard rock or concrete application. This problem is solved by a tool attachment for a hand tool, which has a housing with a mounting interface, with an attachment housing on which a locking unit for locking the tool attachment to the mounting interface of the power tool and a tool holder for receiving an insert tool are arranged. In the attachment housing a striking mechanism is arranged, which is adapted to act on the insert tool in the striking operation of the tool attachment with executed in the axial direction of the tool holder punches. Here, either the tool holder or the insert tool can be acted upon with the blows.

The invention thus makes it possible to provide a tool attachment, which is also suitable for drilling in hard rock or concrete by the impact mechanism acting in the axial direction of an associated insertion tool.

According to one embodiment, the impact mechanism is designed in the manner of a pneumatic striking mechanism.

Thus, the provision of a tool attachment with a reliable and reliable impact mechanism can be made possible.

The percussion preferably has a racket which is driven in the operation of the tool attachment by an associated piston hitting against a firing pin.

Thus, the provision of a stable and robust impact mechanism can be made possible.

Preferably, the firing pin is connected to an output member associated with the tool holder.

Thus, generated by the percussion, axial impacts can be transmitted in a simple manner on the tool holder on the associated insert tool.

According to one embodiment, the percussion mechanism is designed in the manner of a mechanical striking mechanism. The invention thus makes it possible to provide a tool attachment with a striking mechanism, which has a comparatively uncomplicated and space-saving design.

Preferably, the hammer mechanism has a drive member arranged coaxially with the tool holder.

The invention thus enables the provision of a compact striking mechanism with reduced spatial dimensions.

Preferably, the tool holder has a rotatable about an associated axis of rotation output spindle, wherein the axis of rotation coincides with a drive axis of the impact mechanism.

Thus, the provision of an uncomplicated and precise and user-friendly applicable percussion can be made possible.

The percussion mechanism is preferably designed for the direct impact drive of an output member associated with the tool holder in impact operation of the tool attachment, wherein the output member is designed to transmit corresponding impact impulses directly to the insertion tool. According to one embodiment, the output member is formed by the output spindle of the tool holder.

Thus, a stable and robust percussion can be provided, in which a simple way a impact energy of more than 0.6 J can be generated, so using the percussion z. B. also in concrete holes can be drilled.

Preferably, the striking mechanism has a spring-loaded impactor with a spring element, which is coupled via a ball guide with an associated spring tensioning member.

The invention thus enables the provision of a striking mechanism with a reliable and uncomplicated structure. According to one embodiment, the impact mechanism has an actuatable engagement clutch for activating the impact operation of the percussion mechanism.

The invention thus enables the provision of an impact mechanism in which a corresponding impact operation can be activated in a simple manner.

Preferably, the engagement clutch is adapted to allow upon actuation a drive of the spring tensioning member for tensioning and releasing the spring element.

Thus, a safe and reliable activation of the impact operation of the impact mechanism can be made possible.

According to one embodiment, a transmission is arranged in the attachment housing.

Thus, a generation of a required for drilling in hard rock or concrete impact of the percussion can be ensured in a simple manner.

The transmission is preferably designed in the manner of a transmission gear in such a way that a speed for driving the percussion gear is increased relative to a rotational speed of a driven member by the transmission gear. The transmission gear is formed in particular in the manner of a single-stage planetary gear. The transmission gear is in particular designed such that it can be activated in the impact mode of the striking mechanism. The transmission gear is in particular coupled to the engagement clutch. The coupling of the transmission gear and the engagement clutch is preferably such that upon activation of the clutch and the transmission gear is activated.

According to one embodiment, the tool holder is designed to accommodate SDS-plus and / or SDS-Quick insert tools.

The invention thus makes it possible to provide a tool attachment that can be used with a variety of types of insert tools and thus can be used in a variety of different applications and in a variety of different working conditions.

Preferably, the tool holder is designed for receiving round shaft insert tools and / or HEX insert tools.

Thus, the possible areas of application and working conditions in which the tool attachment can be applied can be additionally extended. Preferably, the tool attachment for positive drive by the

Hand tool machine trained. For this purpose, the tool attachment on a drive member, which may be formed for example as a drive shaft. The drive member has a free end on which a polygonal drive contour is formed. The polygonal drive contour can be designed, for example, as a hexagonal driving contour. The polygonal driving contour is intended to be received in a tool holder of a power tool and to be driven in rotation by the tool holder. The tool holder of the power tool has for this purpose a corresponding to the polygonal driving contour polygonal inner receptacle.

Thus, an uncomplicated and stable drive of the tool attachment can be made possible. The problem mentioned at the outset is also solved by a tool system with a hand tool having a housing with a mounting interface, and with a tool attachment having a header housing to which a locking unit for locking the tool attachment to the mounting interface of the power tool and a tool holder for receiving an insertion tool are arranged. In the attachment housing a striking mechanism is arranged, which is adapted to act on the insert tool in the striking operation of the tool attachment with executed in the axial direction of the tool holder punches. The invention thus makes it possible to provide a tool system with a hand-held power tool and a tool attachment, which is characterized by the axia- ler direction of an associated application tool effective Schlagwerk is also suitable for drilling in hard rock or concrete.

The hand tool is preferably designed in the manner of a cordless drill or cordless screwdriver.

Thus, hand tooling machines for drilling in hard rock or concrete can be equipped with the tool attachment according to the present invention, which would not be suitable without the tool attachment, so that their fields of application and usability can be increased or improved in a simple manner.

Preferably, the tool attachment is designed for the positive drive by the power tool.

Thus, an uncomplicated and stable drive of the tool attachment can be made possible.

Preferably, the power tool on a drive spindle and the tool holder of the tool attachment an output spindle, wherein the drive spindle and the output spindle after attachment of the tool attachment to the power tool have a common axis of rotation.

Thus, the provision of an uncomplicated and precise as well as user-friendly applicable tool system can be made possible.

Brief description of the drawings

The invention is explained in more detail in the following description with reference to exemplary embodiments illustrated in the drawings. Show it:

1 is a schematic view of a hand tool with a tool holder and a mounting interface according to a first embodiment, 2 is a sectional view of a detail of a tool system with the portable power tool of FIG. 1 and a tool attachment attached thereto according to a first embodiment, FIG.

3 is a sectional view of the tool attachment of Fig. 2,

4 is a sectional view of a tool attachment according to a second embodiment,

5 is a perspective view of a tool holder and a mounting interface of the power tool of FIG. 1 according to a second embodiment,

6 is a sectional view of a tool attachment according to a third embodiment,

Fig. 7 shows a detail of Fig. 6, and

8 is a sectional view of the tool attachment of FIG. 6, viewed in the direction of a section line VIII-VIII of FIG. 6.

Description of the embodiments

1 shows an exemplary handheld power tool 100, which has a tool housing 105 with a handle 15, and an enlarged detail 160 of the handheld power tool 100. According to one embodiment, the handheld power tool 100 can be mechanically and electrically connected to a battery pack 190 for mains-independent power supply. In Fig. 1, the power tool 100 is exemplified as a cordless drill driver. It should be noted, however, that the present invention is not limited to cordless drill, but rather can be applied to various hand tool machines in which a tool is rotated, regardless of whether the hand tool network dependent on the network or independently operated with the battery pack 190 is, for. B. in a screwdriver or cordless screwdriver, etc. In the tool housing 105, at least one of the battery pack 190 powered with electricity, electric drive motor 180 and a transmission 109 are preferably arranged. The drive motor 180 is z. B. via a manual switch 195 on and off and can be any type of engine, z. As an electronically commutated motor or a DC motor. The gear 109 may, for. Example, be designed in the manner of a reduction gear that can be realized, for example, with a planetary gear formed with different planetary stages, which is optionally associated with a torque clutch 199. The operation and structure of a suitable drive motor and a suitable transmission and a suitable torque clutch and their

Functions are well known to those skilled in the art, so for the sake of brevity of the description and simplicity of the drawings, an illustration and detailed description thereof will be omitted. The transmission 109 is illustratively arranged in a gear housing 1 10 and the drive motor 180 in a motor housing 185, wherein the gear housing 1 10 and the motor housing 185 are arranged for example in the tool housing 105. The drive motor 180 is connected via the gear 109 with a drive shaft 120, z. B. a drive spindle connected. During operation of the hand-held power tool 100, the motor 180 rotatably drives the drive shaft 120 via the gear 109.

According to one embodiment, the power tool 100 is associated with a tool holder 140 for receiving an insert tool 150, which has a bit holder 145 by way of example. This tool holder 140 may be integrally formed with the drive shaft 120 which can be driven by the drive motor 180 via the gear mechanism 109 or be connected to it in a tower-shaped manner.

Illustratively, the bit holder 145 has an actuating sleeve 149 and a polygonal inner receptacle 147, in particular a hexagonal inner receptacle, for receiving a so-called HEX drill or a screwdriver bit. Suitable HEX drills and bits are tools that have a shank with at least a section hexagonal section, which is provided with an annular groove in HEX drills. In addition, the bit holder 145 can also, or alternatively, for receiving a so-called SDS-Quick Mini

Drilling tool to be formed. Suitable SDS-Quick Mini drilling tools are drilling tools that have a substantially cylindrical shaft have two parallel to the longitudinal axis of the shaft protruding rotary drive webs, each having a locking recess. It should be noted, however, that the hexagonal inner receptacle 147 may also or alternatively be designed to accommodate other types of insert tools. For example, the hexagonal inner receptacle 147 may also be designed to accommodate SDS-Plus insert tools. Exemplary application tools and the structure and operation of a suitable bit holder are well known to the skilled person, z. Example, from DE 20 2007 010 699 111, the disclosure of which is explicitly included in the present description, so that here for the sake of scarcity of description can be dispensed with a detailed description of these components.

According to one embodiment, the handheld power tool 100 or the tool holder 140 is associated with a mounting interface 170, which is advantageously arranged axially and radially immovably in the region of an end face 12 of the tool housing 105. It is however referred to below as "mounting sleeve." It should be noted, however, that the fastening sleeve 170 is designed, for example, as a separate component and, alternatively, also integrally with the tool housing 105 and / or the gear housing 110 can be trained.

The fastening sleeve 170 serves as a locking and centering arrangement for an associated tool attachment (300 in FIG. 3) and at least partially encloses the bit holder 145 with a predetermined radial spacing, in order to axially displace the actuating sleeve 149 of the bit holder 145 inside the fastening sleeve 170 to enable. On the inner circumference 179 of the mounting sleeve 170 are illustratively spaced, web-like elevations are provided which extend in the longitudinal direction of the mounting sleeve 170 and are directed radially inwardly, and of which only two elevations are marked by the reference numeral 171 for clarity and clarity of the drawing. Between these web-like elevations illustratively groove-like recesses are formed, of which for the sake of clarity and clarity of the drawing, only two recesses are identified by the reference numeral 178. These recesses 178 may z. B. as spaces between the web-like elevations or on the type of depressions on the inner circumference 179 of the mounting sleeve 170 may be formed. According to one embodiment, the fastening sleeve 170 has an outer circumference 173, which tapers at an annular shoulder 172 into a reduced region 176 facing away from the tool housing 105. In this reduced region 176, at least one and preferably a multiplicity of plate-shaped control elements are provided on the outer circumference 173. These are illustratively designed in the manner of right-angled trapezoids and each have an associated, bevelled leading edge. For the sake of simplicity and clarity of the drawings, only two controls are identified by the reference numeral 174 and only two leading edges by the reference numeral 175.

FIG. 2 shows an exemplary tool system 200, which comprises the hand tool 100 of FIG. 1 provided with the tool housing 105, the bit holder 145 and the mounting sleeve 170 and a tool attachment 300 fastened thereto and attached by way of example thereto. The fastening sleeve 170 of the handheld power tool 100 illustratively has on its outer periphery 173 the exemplary plate-shaped control element 174 and another exemplary plate-shaped control element 276, which has a guide edge 277 by way of example. A complete description of the attachment interface parts 170 can be found in DE 10 201 1 084 499 A1, the disclosure of which is explicitly included in the present description, so that a detailed description thereof can be dispensed with here for the purpose of conciseness of the description. According to one embodiment, the tool attachment 300 has one in one

Attachment housing 305 arranged output unit 370 and arranged on the attachment housing 305 locking unit 350 for locking the tool attachment 300 on the mounting sleeve 170 of the power tool 100, preferably for rotationally fixed locking. The output unit 370 is shown for simplicity and clarity of the drawing in Fig. 2 only partially and therefore not described here. However, the output unit 370 will be described in greater detail in FIG. 3, in which it is fully shown. The attachment housing 305 may be formed in one piece or several pieces. In addition, the attachment housing 305 can also be made of several individual housings be composed or have a plurality of interconnected individual housing.

The locking unit 350 illustratively has a main body 302 connected to the attachment housing 305, in which a drive member 380 of the tool attachment 300 is rotatably mounted. The drive member 380 is formed in the embodiment of FIG. 3 as a drive shaft. This main body 302 has illustratively on its outer circumference 355 an annular groove 21 1, in which a radially inwardly directed annular collar 249 of the attachment housing 305 is fixed such that the attachment housing 305 at least axially immovable on the base body

302 is attached.

The main body 302 forms a receiving region 315 in the form of an inner cavity for receiving the bit holder 145 provided with at least one locking element 148 and an actuating sleeve 149. On its outer circumference 355, on the one hand, a rotation-preventing unit 332 is formed and, on the other hand, a locking sleeve 205 is arranged rotatably and preferably axially non-displaceably. The rotation-preventing unit 332 is designed to fasten the base body 302 to the fastening sleeve 170 of the hand-held power tool 100 preferably secured against rotation. The locking sleeve 205 is used to release or block at least one associated locking element 202, which is illustratively formed in the manner of a circumferential direction of the locking sleeve 205 aligned blocking ridge on the inner circumference 207 of the locking sleeve 205.

According to one embodiment, the rotation-preventing unit 332 is formed in an axial end region of the outer circumference 355 of the main body 302 facing the tool housing 105 of the handheld power tool 100 such that the anti-rotational unit 332 and the fastening sleeve 170 of the handheld power tool 100 have complementary geometric shapes that form a positive connection are suitable and are accordingly adapted to engage for releasable, preferably secured against rotation attachment of the base body 302 to the mounting sleeve 170 into one another. Accordingly, the anti-twist unit 332 illustratively has at least one web-like elevation, which extends on the outer circumference 355 in FIG

Longitudinal direction of the base body 302 extends, wherein in FIG. 2 by way of example two elevations 334, 336 are visible. Between these ridge-like elevations 334, 346 are z. B. groove-like recesses formed, preferably as spaces between the web-like elevations 334, 336 or on the type of depressions on the outer circumference 355. Illustratively, the web-like elevations 334, 336 and these groove-like recesses extend to a formed on the outer circumference 355, annular projection 220, against which of

Tool housing 105 remote from an annular shoulder 210 is applied, which is formed on the inner circumference 207 of the locking sleeve 205.

The annular shoulder 210 is at the outer periphery 355 of the body 302 between the annular projection 220 and one illustratively in an annular groove 212 of

Main body 302 arranged retaining ring 216 arranged at least substantially axially immovable. In the region of the securing ring 216, the annular shoulder 210 has a beveled edge 299 by way of example. Between the annular shoulder 210 and an end face 241 of the attachment housing 305 facing the handheld power tool 100, a spring element 298, for example, is shown. Legs

Torsion spring, arranged. This is preferably designed to impose the locking sleeve 205 in a locking position with a predetermined spring force in the direction of an arrow 297 in order to form the detachable, preferably non-rotational fastening of the base body 302 to the fastening sleeve 170, wherein the locking position of a first rotational position position of the locking sleeve 205 equivalent.

For attachment of the tool attachment 300 to the mounting sleeve 170 of the power tool 100 whose base 302 is pushed in the direction of arrow 297 on the mounting sleeve 170, so that the drive shaft 380 of the tool 300 is positively inserted into the bit holder 145 thus can be rotationally driven by this form-fitting. For this purpose, the drive shaft 380 has a free end 382 which is provided with a polygonal driving contour 384. For positive reception of the polygonal driving contour 384 in the polygonal inner receptacle 147 are the

Polygonal driving contour 384 and the polygonal inner receptacle 147 formed correspondingly. The base body 302 and thus the tool attachment 300 are in this case releasably locked to the fastening sleeve 170 of the power tool 100, without the need for manual rotation of the locking sleeve 205 by a user. Thus, the assembly of the tool attachment 300 on the hand tool 100 can be done in a comfortable manner one-handed by the user. In addition, will the base body 302 for torque support by means of the anti-rotation device 332 preferably fixed against rotation and fixed to the mounting sleeve 170 and centered. It should be understood, however, that the attachment of the tool attachment 300 to the mounting sleeve 170 is not part of the present invention, so that a detailed description thereof is given for the purpose of

Shortage of description can be dispensed with.

It should be noted, however, that the above description of the at least within predetermined tolerances axially immovable and preferably non-rotatable attachment of the locking unit 350 on the mounting sleeve or - cut parts 170 only exemplary character and is not to be understood as limiting the invention. Rather, a variety of different, also known from the prior art fastening types find application by a z. B. secured against rotation attachment of a corresponding tool attachment to the power tool 100 can be made possible. In this case, both rotary fastening devices, such. As bayonet joints, as well as spring-loaded fasteners apply, etc. Fig. 3 shows the tool attachment 300 of Fig. 2 with the attachment in the housing

At an axial end of the attachment housing 305 facing away from the locking unit 350, a tool receptacle 340, which is provided with an output member 344, for receiving an insertion tool (eg, the insertion tool 150 of FIG. arranged. The output member 344 is illustratively

Formed a type of locking sleeve or a tool holder and provided with an inner receptacle 348. This is designed according to an embodiment for receiving SDS-plus and / or SDS-Quick insert tools. In addition or as an alternative, the inner receptacle 348 can also be designed to accommodate round shaft insert tools and / or HEX insert tools.

The output unit 370 is driven in accordance with an embodiment of the drive shaft 380, which via an associated bearing element 307, z. B. a rolling bearing, rotatably mounted in the main body 302 of the locking unit 350 which is axially immovably connected to the attachment housing 305 as described in FIG. Preferably, the drive shaft 380 for rotating drive of the output member 344 and for driving a percussion mechanism 320 arranged in the attachment housing 305, which is designed to engage an insertion tool (eg the insertion tool 150 of FIG. 1) arranged in the tool receptacle 340 in the axial direction of the tool attachment 300 - To act on the tool holder 340 executed blows. In order to produce a required in particular for drilling in hard rock or concrete impact force, a gear 310 is preferably interposed between the drive shaft 380 and the hammer mechanism 320, which is preferably designed in the manner of a transmission gear. Alternatively, the transmission 310 may be formed in the manner of a reduction gear.

According to a first embodiment, the percussion mechanism 320 is designed in the manner of a pneumatic impact mechanism and has a racket 322, which is driven in the operation of the tool attachment 300 by a piston 321 hitting against a firing pin 324 which is connected to the output member 344. The piston 321 is driven at least indirectly by the transmission 310. Air acts as a spring between the piston 321 and the beater 322 in the case of the percussion mechanism 320 designed in the manner of a pneumatic impact mechanism. In addition, impact mechanism 320 has, for example, an overload clutch 330.

It should be noted, however, that the construction and operation of a pneumatic impact mechanism are well known to those skilled in the art. For example, the pneumatic percussion mechanism may be designed in the manner of a pneumatic impact mechanism commonly used in rotary hammers. Therefore, here in order

Scarcity of description dispensed to a detailed description of the pneumatic impact mechanism.

FIG. 4 shows a tool attachment 400 according to a second embodiment, which has an output unit 470 arranged in an attachment housing 405 and a

Locking unit 450 has. The locking unit 450 is realized by way of example with the locking unit 350 of the tool attachment 300 of FIGS. 2 and 3, so that the tool attachment 400 is operated instead of the tool attachment 300 of FIGS. 2 and 3 with the handheld power tool 100 of FIG. 1 and attached thereto to its mounting sleeve 170 can be. At one of the locking unit 350 facing away from the axial end of the attachment housing 405 is preferably provided with an output member 444 tool holder 440 for receiving an insert tool, for. B. the insert tool 150 of Fig. 1, arranged. The output member 444 is illustratively formed in the manner of a latching sleeve and a tool holder and with a

Indoors 448 provided. This is designed according to an embodiment for receiving SDS-plus and / or SDS-Quick insert tools. In addition or alternatively, the inner receptacle 448 may also be designed to accommodate round shaft insert tools and / or HEX insert tools.

The output unit 470 is driven by the formed as a drive shaft drive member 380, which via an associated bearing element 407, z. B. a rolling bearing, rotatably in the base body 302 of the locking unit 350 is superimposed ger, which is here axially immovably connected to the attachment housing 405.

Preferably, the drive shaft 380 is arranged for the rotary drive of the output member 444 and for driving a percussion mechanism 420 arranged in the attachment housing 405, which is adapted to the arranged in the tool holder 440 insert tool 150 during operation of the tool attachment 400 in the axial direction of the tool holder 440 executed To impose blows. In order to produce a required in particular for drilling in hard rock or concrete impact force, preferably between the drive shaft 380 and the hammer mechanism 420, a gear 410 interposed, which is preferably designed in the manner of a transmission gear. Alternatively, the gear 410 may be formed in the manner of a reduction gear.

According to the second embodiment, the striking mechanism 420 is formed in the manner of a mechanical percussion and has a racket 422 which is driven in operation of the tool attachment 400 by a drive spring 421 beating against a firing pin 424 which is connected to the output member 444. The drive spring 421 is driven at least indirectly by the transmission 410. In addition, percussion gear 420 has an overload clutch 430 by way of example.

It should be noted, however, that the construction and operation of the mechanical impact mechanism 420 also sufficiently known to the skilled person are. For example, the mechanical striking mechanism 420 may be designed in the manner of a mechanical percussion mechanism commonly used in rotary hammers. Therefore, for the sake of brevity of the description, a detailed description of the mechanical impact mechanism 420 is omitted here.

5 shows the cutout 160 of the handheld power tool 100 of FIG. 1 with the tool holder 140, which has the bit holder 145 by way of example, and with a fastening interface 550, also referred to below as a "machine interface", according to an alternative embodiment Embodiment of Fig. 2, the bit holder 145 a

Polygonal inner receptacle 147, in particular a hexagonal inner receptacle 147, on. The bit holder 145 has a locking element 148, which can be actuated by means of an actuating sleeve 149. The machine interface 550 is illustratively fixed axially and radially immovably in the area of the bit holder 145 on the tool housing 105 and / or the gear housing 110 of the handheld power tool 100 of FIG. 1. It is pointed out, however, that the machine interface 550 is designed, for example, as a separate component, and as an alternative thereto may also be formed integrally with the tool housing 105 and / or the gear housing 110.

The machine interface 550 is used for preferably secured against rotation attachment of an associated tool attachment (600 in Fig. 6), the z. B. in the manner of a so-called inline, Bohrfutter-, angle or Exzentervorsatzes may be formed and preferably a percussion (640 in Fig. 6). Illustratively, the machine interface 550 has a fastening element 551 fastened against rotation on the end face 12 of the tool housing 105 on this and / or the gear housing 1 10. This is exemplified at least partially sleeve or annular and in the region of a ring on the end face 1 12 12 arranged on the tool housing 105 and the optional torque coupling 199 associated Drehmomenteinstellhülse 558 with suitable fasteners, z. As screws or rivets, attached, but may alternatively be integrally formed with the tool housing 105 and / or the gear housing 1 10. The fastening element 551 preferably surrounds the bit holder 145, at least in sections, with a predetermined radial spacing in order to allow an axial displacement of the locking sleeve 149 of the bit holder 145 in the interior of the fastening element 551. According to one embodiment, the fastening element 551 has on its outer circumference at least one blocking element 555 and at least two retaining members 552, 554. The blocking element 555 preferably has at least one blocking toothing 556, and the at least two holding elements 552, 554 are designed, for example, in the manner of bayonets for forming a bayonet connection. It should be understood, however, that the description of such a bayonet connection is merely exemplary in nature and is not intended to limit the invention. Rather, alternative fastening options can also be used in the machine interface 550, in which a corresponding tool attachment (600 in FIG. 6) can be fastened to the machine interface 550 via a rotational movement, for B. a so-called wire-bar lock, etc.

Illustratively, an at least partially cone-shaped centering aid 553 for axially centering a locking unit (602 in FIG. 6) of an associated tool attachment (600 in FIG. 6) is provided on the machine interface 550, wherein the fastening element 551 is designed to axially center the associated tool attachment (600 in Fig. 6) on the tool housing 105 and / or the transmission housing 1 10 allow. For this purpose, an exemplary annular, at least partially funnel-shaped centering surface 559 for forming the centering aid 553 is provided on the inner circumference of the fastening element 551.

It should be noted, however, that the centering surface 559 is funnel-shaped only as an example and not as a limitation of the invention. Rather, a conical configuration on an additional centering ring can be realized. Accordingly, reference to the term "cone-shaped" in the context of the present invention represents both a reference to a conical and a funnel-shaped configuration of a corresponding component In addition, the centering aid 553 may have multiple cone-shaped arc sections instead of a single annular and funnel-shaped centering surface 559 have, etc.

Furthermore, the fastening element 551 has at least one and by way of example three optional angle adjustment members 557. These serve, for example, in a fastening of a trained in the manner of an angle or Exzentervorsatzes Tool attachment on the machine interface 550 for specifying a predetermined angular position.

FIG. 6 shows a tool attachment 600 according to a third embodiment, which is designed for attachment to the machine interface 550 of FIG. 5.

The tool attachment 600 has, by way of example, a mounting interface 602, which is also referred to below as a "drive section" for the sake of clarity of the description, and a tool receptacle 606, also referred to below as a "receiving section." This illustratively has an SDS here -plus- or SDS-

Quick recording 655 on, but can also have any other recording, z. B. a circular chuck and so on. The drive unit 604 has, for example, an impact mechanism 640 configured in the manner of a mechanical impact mechanism. Therefore, to simplify the description, the tool attachment 600 will also be referred to as the "percussion attachment 600".

The drive section 604 has, for example, a header housing 610 which preferably has an outer, e.g. B. rubberized grip portion 61 1 has. In the attachment housing 610, a percussion 640 associated, rotatably driven drive member 697 is rotatably mounted in a first bearing element 677. The drive member 697 is preferably arranged coaxially to the receiving portion 606 and serves to drive a driven member 698, z. B. via an at least positive connection, wherein the output member 698 is also rotatably mounted in the attachment housing 610, for example in a storage element 623, and z. B. for receiving the screwdriver bit 150 of FIG. 1 may be formed. At this output member 698, a securing member 624, preferably a securing ring, is arranged in the region of the bearing element 623 on the axial side facing the striking mechanism 640, in order to prevent slippage of the output member 698 from the attachment housing 610. On the side remote from the impact mechanism 640 axial side of the bearing element 623 is located

Support ring 625 for supporting a spring element 626, which rests against a secured in the receiving portion 606 via a retaining ring 628, plate-shaped Beaufschlagungsglied 627. The spring element 626 designed in the manner of a compression spring biases the receiving section 606 and thus the output member 698 in an axial direction pointing away from the attachment housing 610, as indicated by an arrow 601. The output member 698 is preferably a driven spindle which is associated with the receiving portion 606 and rotatable about an axis of rotation 619, wherein the rotational axis 619 coincides with a corresponding drive axis of the percussion mechanism 640 or a corresponding axis of rotation of the drive member 697. Accordingly, the percussion mechanism 640 is designed in the manner of a so-called "in-line percussion mechanism" for directly driving the driven member or the output spindle 698 during impact mode of the percussion attachment 600, wherein the output member or the output spindle 698 is designed to apply corresponding impact impulses directly The output member 698 includes a striking surface 696 which is impacted by a striking member 641 of the percussion mechanism 640 in impact mode to damp the impact pulses or any resulting feedback to the attachment housing 610 and for damping vibrations transmitted to the attachment housing 610 by the receiving section 606, an attenuator 622 is provided in the attachment housing 610, which is fixed in the region of the bearing element 623 via a securing element 621, preferably a securing ring 623.

According to one embodiment, the striking mechanism 640 has a spring element 642 which is spring-loaded with a spring element 642 designed in the manner of a compression spring

Impactor 641 which is coupled via a ball guide 680 with an associated spring biasing member 646. The impactor 641 is preferred for performing axially aligned impacts, i. H. Shocks in the direction of arrow 601, provided against the output spindle 698. The spring biasing member 646 is exemplified sleeve-shaped and with its front, the impactor 641 facing axial end 643 received in this, wherein in the region between the spring tension member 646 and the impactor body 641, a spherical clamping element 645 is arranged. This is arranged on the one hand in a radial recess 644 of the impactor body 641 and on the other hand in a formed on the inner periphery of the spring tensioning member 646 cam

Roll off 647. The radial recess 644 of the impactor body 641 is formed on the inner circumference and may, for. B. via a diametrically opposite through-hole 649 are created by performing a corresponding drilling tool.

The position of the spherical clamping element 645 shown in FIG. 6 illustratively corresponds to a clamping position in which the spring element 642 is maximally tensioned is such that by releasing the clamping element 645 an axial impact is made possible by the impactor 641 against the output spindle 698. After carrying out such a stroke, the tensioning element 645 is in a rest position 689 indicated by dashed lines.

At its axial end facing away from the impact body 641, the spring tensioning member 646 receives the drive member 697, wherein the spring tensioning member 646 is rotatably mounted and rotatably mounted thereon independently of the drive member 697. To drive the spring tensioning member 646, a transmission mechanism 700 which can be activated in impact operation of the percussion mechanism 640 is preferably designed here in the manner of a single-stage planetary gear with a planet carrier 615 drivable by the drive member 697 and a plurality of planetary gears 682. These are drivingly coupled to the spring tensioning member 646 via a rotational engagement toothing 648 and arranged in an associated ring gear 650. This is fixed to the housing and secured against rotation in the attachment housing 610 and has a shock body 641 facing axial end in which a bearing element 679, z. B. a rolling bearing, for radially rotatably supporting the spring clamping member 646 is preferably arranged radially and axially immovable, and facing away from the impact body 641 and the set interface 602 facing axial end on which the planet gears 682 attack.

According to one embodiment, to activate the percussion mode of the percussion mechanism 640, an engagement clutch 620, which is preferably actuated by an axial displacement of the output spindle 698 against the spring force of the spring element 626 acting as an idling spring and an actuation of the arrow 601 opposite to the direction of the arrow 601, is provided. This is preferably designed, upon actuation by the output spindle 698 shown in FIG. 6 in an assigned idling position, to drive the spring tensioning element 646 through the transmission gear 700 for tensioning and releasing the spring element 642 via the

To allow impactor 641. In order to permit actuation of the engagement clutch 620 by the output spindle 698, this preferably has a cone-shaped axial end 699, which is arranged in the drive member 697 and is provided for engagement with the engagement clutch 620 in impact operation of the striking mechanism 640. The operation of the engagement clutch 620 is described below in FIG. 7. The mode of operation of percussion mechanism 640 and further details of components thereof are described in DE 10 2013 208 882.5, the disclosure of which is explicitly included in the present description, so that a detailed description thereof can be omitted here for the purpose of conciseness of the description.

The drive member 697 has a remote from the drive portion 604, free end 669, on which advantageously a polygonal driving contour 665, in particular a hexagonal driving contour, is formed. The polygonal driving contour

665 is formed corresponding to the polygonal inner receptacle 147 of the tool holder 140. The polygonal driving contour 665 is intended to be rotationally driven by the polygonal inner receptacle 147 of the power tool 100.

At the free end 669 an at least partially sleeve or rohrformig trained Winkeleinstellelement 672 is arranged, through which the drive member 697 engages at least in sections. The angle adjusting element has a main body 673. The main body 673 is preferably rigid, d. H. axially and radially immovable, connected to the attachment housing 610 and / or formed integrally therewith. Illustratively, the main body 673 has at its the drive portion 604 facing the axial end of an outer annular collar 609, which is arranged axially and radially immovable in the attachment housing 610, z. B. by pressing or jamming, and axially abuts against the ring gear 650. This annular collar 609 is preferably formed on its inner circumference as a receptacle for the planet carrier 615. At its other axial end 671, an end-side Winkeleinstellverzahnung 674 is provided. Between the outer annular collar 609 and the Winkeleinstellverzahnung 674, the main body 673 has a sleeve-shaped portion 608, which forms a receiving portion 675 in the form of an inner cavity for receiving the provided with at least one locking element 148 and an actuating sleeve 149 bit holder 145 of the tool holder 140.

In addition, the drive member 697 forms an actuating member 688, which surrounds the drive member 697 at least partially sleeve-shaped and which is designed to act on the locking sleeve 149 of FIG. Alternatively, the drive member 697 and the actuator 688 may also be formed two or more pieces. The actuator 688 is exemplarily disposed inside the Winkeleinstellelements 672 and preferably radially spaced therefrom. The intent interface 602 is used to attach the percussion attachment 600 to an associated hand tool, z. 1, or its machine interface 550 of FIG. 5, and illustratively has an angular position setting unit 670, to which the angle adjusting element 672 is assigned, and a locking unit 660. The locking unit 660 is designed to act in FIG a lock state the

Schlagwerkvorsatz 600 for operation on the power tool in a predetermined angular position to lock on this and to allow removal of the Schlagwerkvorsatzes 600 of the power tool in an unlocked state. The Winkelpositionseinstelleinheit 670 is adapted to allow adjustment of the predetermined angular position of the percussion attachment 600 for operation on the power tool. Here, according to an embodiment, the angular position setting unit 670 is operable in the locking state of the locking unit 660 to allow a change in the predetermined angular position. Such an operation for changing the predetermined angular position is preferably carried out by a combined longitudinal and rotational movement of the attachment housing 610th

According to one embodiment, the locking unit 660 has a locking body 632 and a rotatably mounted in this spring-loaded centering 681 on. This centering 681 is about suitable

Fasteners 683, z. As screws, secured against rotation on an axial end collar 605 of the Winkeleinstellelements 672, in which the bearing element 677 is arranged. At an axial end of the centering body 681 facing away from the drive section 604, the centering element 631 has at least one centering element 631, which, for. B. at least two arcuate, in the longitudinal direction of Schlagwerkvorsatzes 600, ie against the direction 601, tapered centering 676, 678 has. It should be noted, however, that the centering member 631 merely by way of example has the at least two arcuate tapered centering portions 676, 678 and not for the purpose of limiting the invention. Rather, the centering member 631 can also have a single centering region designed in the manner of a truncated cone. The locking body 632 preferably has at least two locking elements 666, 668, which are exemplified in the manner of bayonets to form a bayonet connection. Furthermore, an actuating ring 664 is arranged on the outer circumference of this locking body 632 by way of example, which can be actuated to lock the locking body 632 to the handheld power tool, wherein the locking body 632 and the actuating ring 664 can be formed in one piece.

In the region between the locking body 632 and the actuating ring 664 is preferably an optional, at least partially resilient blocking and blocking member 607 is arranged. This is at least partially fixed in position on the locking body 632 and / or the actuating ring 664 and designed, in the locking state of the locking unit 660, a rotation of the locking body 632 from its locking position into its

To prevent unlocking position, wherein the blocking and blocking member 607 preferably with the machine interface 550 of FIG. 5 associated locking member 555 of FIG. 5 cooperates. Here, the actuating ring 664 is preferably designed to act on the blocking and blocking member 607 in the locking state of the locking unit 660 at least in sections against the machine interface 550 of FIG. 5. The blocking and blocking member 607 is in this case designed to block the actuating ring 664 in the locking state of the locking unit 660 in a blocking position on the locking body 632, in which the actuating ring 664 acts on the blocking and blocking member 607 at least in sections against the machine interface 550 of FIG to prevent an automatic rotation of the actuating ring 664 relative to the locking body 632.

FIG. 7 shows a detail of the percussion attachment 600 of FIG. 6 to illustrate the transmission 700 and the engagement clutch 620. This has at least one and preferably several, illustratively four, coupling members 712,

714 (and 812, 814 in FIG. 8) disposed in associated apertures of the drive member 697 and in this case by an optional clamping element, for. B. an O-ring or suitable compression springs, can be applied radially inwardly. The coupling members 712, 714 are shown here by way of example in their radially outer clutch positions in which they connect the drive member 697 in a rotationally fixed manner to the planet carrier 615, so that the transmission gear 700 is activated and thus the spring tensioning member 646 is driven faster by its translation, as the output spindle 698th

In addition, Fig. 7 shows the spherical coupling members 712, 714 in their radially inner, dashed or transparent indicated idle positions in which the coupling members 712, 714 are further positioned radially inwardly compared to their coupling positions. From these idle positions, the spherical coupling members 712, 714 can be moved into their coupling positions by being acted upon by the cone-shaped axial end 699 of the output spindle 698 and held there by the output spindle 698. This is achieved by the described in Fig. 6, axial displacement of the output spindle 698 against the force applied by the idle spring 626 of FIG. 6 spring force, with a release of the output spindle 698 this from the idle spring 626 of FIG. 6 back to its idle position procedure or is pressed.

Fig. 8 shows the engagement clutch 620 of the percussion attachment 600 of Fig. 6 and 7 to illustrate the spherical coupling members 712, 714 and two other spherical coupling members 812, 814. These are shown on the one hand in their idle positions and beyond indicated in dashed form in their coupling positions in which they engage in sections in the drive member 697 and sections in associated, dome-shaped recesses 828, 824, 822 and 826 of the planet carrier 615.

The attachment interface 170 of FIG. 1 and the attachment interface 550 of FIG. 5 are each selected by way of example. For example, attachment interface 170 may alternatively be used to secure percussion attachment 600, and attachment interface 550 may alternatively be used to attach percussion attachment 300 or 400. The fastening interfaces 170, 550 are designed to provide an axial securing and an anti-rotation lock of the tool attachment 300, 400, 600 on a stationary housing component, in particular the tool housing 105 and / or the gear housing 110, of the handheld power tool 100.

Alternative embodiments of the attachment interface and the securing elements for axial securing and securing elements for preventing rotation are possible. An alternative attachment interface with the corresponding For example, in DE 10 201 1 084 495 A1, the disclosure of which is explicitly included in the present description, so that a detailed description thereof can be omitted here for the purpose of conciseness of the description. Other alternative security elements are also possible. Thus, for example, serve as an axial securing element and a clamping element, for example, a clamping lever on the tool attachment, which cooperates with a circumferential groove on the housing of the power tool. In a further alternative embodiment of a locking of a tool attachment to a hand tool machine, securing elements for preventing rotation are formed on a stationary housing component such as the tool housing and / or the gear housing. The anti-rotation elements may be, for example, locking projections, for which corresponding locking recesses are provided on the tool attachment. Securing elements for axial securing, however, are provided on the output spindle or the bit holder of the power tool. As Axialsicherungselement can be present on the circumferential surface of the bit holder circumferential groove. Accordingly, at least one locking body cooperating with the groove, for example a locking ball, is arranged on the tool attachment. For locking purposes, the locking body engages in the groove on the bit holder.

Claims

claims

1 . Tool attachment (300, 400, 600) for a hand tool (100), comprising a housing (105) with a mounting interface (170), with an attachment housing (305, 405, 610) to which a locking unit (350, 602) for Locking the tool attachment (300) on the attachment interface (170) of the handheld power tool (100, 300, 600) and a tool holder (340, 440, 606) for receiving an insertion tool (150) are arranged, characterized in that in the attachment housing (305 , 405, 610) a striking mechanism (320, 420, 640) is arranged, which is adapted to the insert tool (150) in the striking operation of the tool attachment (300, 400, 600) in the axial direction of the tool holder (340, 440, 606 ) applied impacts.

2. Tool attachment according to claim 1, characterized in that the

Schlagwerk (320) is designed in the manner of a pneumatic impact mechanism.

3. Tool attachment according to claim 1 or 2, characterized in that the percussion mechanism (320) has a racket (322) which is driven during operation of the tool attachment (300) by an associated piston (321) striking against a firing pin (324).

4. Tool attachment according to claim 3, characterized in that the

Striker (324) with a tool holder (340) associated output member (344) is connected.

5. Tool attachment according to claim 1, characterized in that the

Schlagwerk (640) is designed in the manner of a mechanical striking mechanism.

6. Tool attachment according to claim 5, characterized in that the

Impact mechanism (640) has a coaxial with the tool holder (606) arranged drive member (697).

7. Tool attachment according to claim 5 or 6, characterized in that the tool holder (606) has an associated about an axis of rotation (619) rotatable output spindle (698), wherein the axis of rotation (619) with a drive axle (619) of the impact mechanism (640) coincides.

8. Tool attachment according to one of claims 5 to 7, characterized in that the striking mechanism (640) for direct beating drive of the tool holder (606) associated output member (698) in the impact mode of the tool attachment (600) is formed, wherein the output member (698 ) is adapted to transmit corresponding impact pulses directly to the insert tool (150).

9. Tool attachment according to one of claims 5 to 8, characterized in that the striking mechanism (640) with a spring element (642) spring-loaded striker (641) which is coupled via a ball guide (680) with an associated spring biasing member (646) ,

10. Tool attachment according to one of claims 5 to 9, characterized in that the striking mechanism (640) has an actuatable engagement clutch (620) for activating the impact operation of the striking mechanism (640).

1 1. Tool attachment according to claim 9 and 10, characterized in that the engagement clutch (620) is adapted to allow upon actuation a drive of the spring biasing member (646) for tensioning and releasing the spring element (642).

12. Tool attachment according to one of the preceding claims, characterized in that in the attachment housing (305) a transmission (310) is arranged.

13. Tool attachment according to one of the preceding claims, characterized by a transmission gear (700) which is adapted to increase a speed for driving the impact mechanism (640) against a rotational speed of a driven member (698).

14. Tool attachment according to one of the preceding claims, characterized in that the tool holder (340, 440, 606) is designed for receiving SDS-plus and / or SDS-Quick insert tools.

15. Tool attachment according to one of the preceding claims, characterized in that the tool holder (340, 440, 606) is designed for receiving round shank insert tools and / or HEX insert tools.

16. Tool attachment according to one of the preceding claims, which is designed for the positive drive by the power tool (100).

17. Tool attachment according to one of the preceding claims, characterized in that a drive member (380, 697) has a free end (382, 669) on which a polygonal driving contour (384, 665) is formed.

18. Tool system (200) with a hand tool (100), which has a housing (105) with a mounting interface (170), and with a tool attachment (300), which has an attachment housing (305) on which a locking unit (350) for locking the tool attachment (300) on the attachment interface (170) of the hand tool (100) and a tool holder (340) for receiving an insert tool (150) are arranged, characterized in that in the attachment housing (305) arranged a striking mechanism (320) is that is adapted to act on the insert tool (150) in the impact mode of the tool attachment (300) with in the axial direction of the tool holder (340) executed blows.

19. Tool system according to claim 18, characterized in that the hand tool (100) is designed in the manner of a cordless drill or cordless screwdriver.

20. Tool system according to claim 18 or 19, characterized in that the tool attachment (300) is designed for the positive drive by the hand tool (100). Tool system according to one of claims 18 to 20, characterized in that the hand tool (100) has a drive spindle (120) and the tool holder (606) of the tool attachment (600) has an output spindle (698), wherein the drive spindle (120) and the

Output spindle (698) after attachment of the tool attachment (600) on the power tool (100) have a common axis of rotation (619).