Intermediate attachment for a hand tool

Abstract

Intermediate attachment (100) for a hand-held power tool (10), which has a fastening interface (50) to which an exchangeable tool attachment (60, 160) can be fastened, and which has a tool holder (40) in which an associated insert tool (74, 120) can be received, wherein the intermediate attachment (100) has a locking unit (102) for locking to the fastening interface (50) of the hand-held power tool (10) and an attachment tool holder (110) for receiving an associated insert tool (74, 120), characterized in that the intermediate attachment (100) has an attachment fastening interface (130) to which an exchangeable tool attachment (60, 160) can be locked, wherein the attachment fastening interface (130) is designed to be compatible with the fastening interface (50) of the hand-held power tool (10).

Description

State of the art

[0001] The present invention relates to an intermediate attachment for a handheld power tool, which has a fastening interface to which an interchangeable tool attachment can be fastened, and which has a tool holder in which an associated insert tool can be received. The intermediate attachment has a locking unit for locking to the fastening interface of the handheld power tool and an attachment tool holder for receiving an associated insert tool. Furthermore, the present invention relates to a tool system comprising a handheld power tool and such an intermediate attachment.

[0002] A variety of tool attachments for use with cordless or mains-powered hand tools are known in the art. These attachments are equipped with a universal interface for quick connection to the hand tools. Such tool attachments are designed, for example, as angle attachments, eccentric attachments, or torque attachments.

[0003] Furthermore, a tool attachment for a handheld power tool having a housing with a mounting interface is already known from document DE 10 2014 205 555 A1. Document DE 10 2013 213 816 A1 discloses a drill chuck attachment whose drive shaft engages in a tool holder and is axially centered by it. Furthermore, document DE 10 2012 220 905 A1 also shows a handheld power tool having a housing to which a mounting interface for attaching a tool attachment having a centering mechanism is provided. Final versionDisclosure of the invention

[0004] The present invention provides an intermediate attachment for a handheld power tool, which has a fastening interface to which an interchangeable tool attachment can be fastened, and a tool receptacle in which an associated insert tool can be received. The intermediate attachment has a locking unit for locking to the fastening interface of the handheld power tool and an attachment tool receptacle for receiving an associated insert tool. The intermediate attachment has an attachment fastening interface to which an interchangeable tool attachment can be locked, the attachment fastening interface being designed to be compatible with the fastening interface of the handheld power tool.

[0005] By using the intermediate attachment, at least the overall axial length of a handheld power tool can be easily extended, allowing, among other things, access to otherwise difficult-to-access areas of a workpiece to be machined. Furthermore, another tool attachment can be attached to the intermediate attachment and removably coupled to it, allowing, for example, an angle or eccentric attachment to be operated with the intermediate attachment.

[0006] Preferably, a device for adjusting a torque is provided.

[0007] This allows another tool attachment downstream of the intermediate attachment to be operated with a defined drive torque.

[0008] In an advantageous embodiment, the locking unit is designed for anti-twist locking at the fastening interface of the hand-held power tool.

[0009] As a result, a rotationally fixed connection between the intermediate attachment and an associated hand-held power tool can be achieved in a simple manner.

[0010] Preferably, the attachment fastening interface is designed for the rotationally secured fastening of the replaceable tool attachment.

[0011] This makes it possible, for example, to couple a tool attachment with a different functionality serially and in a rotationally secured manner with the intermediate attachment and to operate both together on a hand-held power tool.

[0012] In an advantageous further development, the interchangeable tool attachment is an angle attachment.

[0013] As a result, even hard-to-reach workpieces or components can be reached with the insert tool in cases of confined spaces.

[0014] The interchangeable tool attachment is preferably an eccentric attachment.

[0015] This allows for working close to the edge. Furthermore, the intermediate attachment can be designed as a rigid extension or as a flexible, so-called "bendable" shaft.

[0016] Furthermore, the present invention provides a tool system with a handheld power tool and an intermediate attachment, wherein the handheld power tool has a fastening interface to which an interchangeable tool attachment can be fastened, as well as a tool holder in which an associated insert tool can be received, and wherein the intermediate attachment has a locking unit for locking to the fastening interface of the handheld power tool and an attachment tool holder for receiving an associated insert tool. The intermediate attachment has an attachment fastening interface to which an interchangeable tool attachment can be locked, wherein the attachment fastening interface is designed to be compatible with the fastening interface of the handheld power tool.

[0017] The invention thus enables the provision of a tool system in which the overall axial length of a handheld power tool can be easily increased by using an intermediate attachment. Furthermore, another tool attachment can be attached to the intermediate attachment and releasably coupled to it, allowing, for example, an angle or eccentric attachment to be operated with the intermediate attachment.

[0018] According to one embodiment, the tool system has at least one interchangeable tool attachment, in particular an angle and / or an eccentric attachment.

[0019] This allows the application possibilities of the tool system to be expanded considerably with only minimal additional effort.

[0020] Preferably, the interchangeable tool attachment can be attached to the attachment interface of the hand-held power tool or the attachment attachment interface of the intermediate attachment.

[0021] This makes it possible to provide a complex tool system that is suitable for a wide range of different applications.

[0022] Preferably, the intermediate attachment has a device for adjusting a torque.

[0023] This allows another tool attachment downstream of the intermediate attachment to be operated with a defined drive torque. Short description of the drawings

[0024] The invention is explained in more detail in the following description using exemplary embodiments illustrated in the drawings. They show: Fig. 1 a side view of a hand-held power tool with an intermediate attachment locked thereto according to an embodiment, Fig. 2 an enlarged view of the intermediate endpaper of Fig. 1 showing section II of Fig. 1, Fig. 3 a perspective view of a mounting interface of the hand tool of Fig. 1, Fig. 4 the hand tool from Fig. 1 with a on the intermediate endpaper of Fig. 1 and Fig. 2 locked, optional tool attachment, Fig. 5 a perspective view of the optional tool attachment of Fig. 4, and Fig. 6 a perspective view of another optional tool attachment. Description of the embodiments

[0025] Fig. 1 shows a handheld power tool 10 which, by way of example, is equipped with a battery pack 12 for mains-independent power supply. The battery pack 12 is illustratively permanently installed in the handheld power tool 10, but alternatively can also be connected to it in an interchangeable manner. The handheld power tool 10 is, by way of example, designed in the manner of a cordless drill / driver. It should be noted, however, that the present invention is not limited to cordless drill / drivers, but can rather be applied to various handheld power tools in which a tool is set in rotation, regardless of whether the handheld power tool can be operated with the battery pack 12 in a mains-dependent or mains-independent manner, e.g., in a screwdriver, a cordless screwdriver, or the like.

[0026] In a tool housing 16 with a pistol-like handle 18 of the hand-held power tool 10, at least one drive motor 20, preferably an electric one, supplied with power by the battery pack 12, and a gear mechanism 22 connected downstream thereof are preferably arranged. The drive motor 20 can be switched on and off, for example, via a handset 30 and can be any motor type, e.g., an electronically commutated motor or a DC motor. The gear mechanism 22 can be designed, for example, in the manner of a switchable reduction gear, which can be realized, for example, with a planetary gear mechanism configured with various planetary stages. The mode of operation and the structure of a suitable drive motor and a suitable gear mechanism and their modes of operation are sufficiently known to those skilled in the art, so that an illustration and detailed description thereof are omitted here for the sake of brevity of the description and simplicity of the drawings.

[0027] The drive motor 20 is connected to the gear unit 22 by means of a drive shaft 24, e.g., a drive spindle. During operation of the handheld power tool 10, the drive motor 20 drives the gear unit 22 in rotation by means of the drive shaft 24. According to the embodiment shown here, the handheld power tool 10 is equipped with a tool holder 40, indicated only by dashed lines, which is driven in rotation by the gear unit 22 via an output shaft 42. The tool holder 40 can, for example, be integrally formed on the output shaft 42 or connected to it in the form of an attachment.

[0028] The handheld power tool 10 has, in the area of ​​an end face 32 of the tool housing 16—which faces a workpiece to be machined—a fastening interface 50 to which an interchangeable tool attachment (not shown here) or an interchangeable intermediate attachment 100 can be fastened by means of a locking unit 102. The locking unit 102 of the intermediate attachment 100 is designed to lock the intermediate attachment 100 to the fastening interface 50 of the handheld power tool 10 in a rotationally secured manner.

[0029] The intermediate attachment 100, in turn, has an attachment fastening interface 130, which extends axially away from the locking unit 102 and to which a further, in particular interchangeable, tool attachment can be locked. The attachment fastening interface 130 is designed to be compatible with the fastening interface 50 of the handheld power tool 10 to enable the free interchangeability of any optional tool attachment with the intermediate attachment 100. The attachment fastening interface 130 is also designed for anti-twist locking with any interchangeable tool attachment.

[0030] Furthermore, the intermediate attachment 100 has an attachment tool holder 110 for receiving an associated insert tool 120, which is preferably identical to the tool holder 40 of the handheld power tool 10, at least within specified tolerances. In other words, the structural design of the tool holder 40 preferably corresponds to that of the attachment tool holder 110. For the sake of simplicity and conciseness of the description, therefore, only the attachment tool holder 110 will be described in more detail below.

[0031] The attachment tool holder 110 is preferably designed in the manner of a bit holder 112 with a polygonal socket 114, i.e. for receiving an insert tool 120 designed in the manner of a screwdriver bit, which can be pushed or inserted into the polygonal socket 114 in the direction of the handheld power tool 10. A screwdriver bit of this type, which can be of the so-called HEX type, for example, is sufficiently known from the prior art, so that a more detailed description is omitted here for the sake of brevity. It should be noted, however, that the present invention is not limited to the use of so-called HEX screwdriver bits, but that other insert tools can also be used depending on the respective selected configuration of the attachment tool holder 110, e.g. HEX drills or so-called SDS-Quick insert tools.Furthermore, it is pointed out that the structure and functioning of a suitable bit holder 112 are sufficiently familiar to the person skilled in the art, so that a more detailed description of the bit holder 112 can be omitted here for the sake of brevity of the description.

[0032] Preferably, a device 150 for adjusting a torque or a torque adjustment device is integrated into the intermediate attachment 100. Such a device for adjusting a torque is known to the person skilled in the art from the prior art, including DE 10 2006 057 928 A1 (cf. in particular the description with respect to Fig. 3 and reference number 70), the disclosure of which is expressly included in the description at this point. To avoid repetition of content, a further description of the torque adjustment device 150 can therefore be omitted here.

[0033] Fig. 2 shows a section II of Fig. 1 to illustrate the intermediate attachment 100. Its locking unit 102 is preferably designed for anti-twist locking at the fastening interface 50 of the hand-held power tool 10 of Fig. 1. A maximum torque that can be transmitted via the intermediate attachment 100 by means of the torque adjustment device 150 to the attachment tool holder 110 is preferably adjustable by means of a rotatable adjusting ring 152. To facilitate operation, the adjusting ring 152 can be grooved, knurled and / or rubberized. The preferred detailed structural design of the locking unit 102 of the intermediate attachment 100 is known to the person skilled in the art from the prior art, inter alia from DE 10 2007 006 329 A1 (cf. the description with reference to Fig. 3, in particular reference number 40), so that their disclosure is expressly and explicitly included in the description at this point in order to avoid repetition of content.

[0034] However, it should be noted that alternative designs of the locking unit 102 of the intermediate attachment 100 are also possible. Exemplary designs are known to the person skilled in the art, for example, from the prior art, including DE 10 2011 084 495 A1, DE 10 2011 084 499 A1, DE 10 2012 220 905 A1 and DE 10 2013 213 804 A1, the disclosures of which are expressly and explicitly included in the description at this point in order to avoid repetition of content. For example, DE 10 2013 213 804 A1 describes a locking unit which is designed for bayonet locking on a correspondingly designed fastening interface of the hand-held power tool 10 of Fig. 1 is provided.

[0035] The attachment fastening interface 130 of the intermediate attachment 100 has, among other things, an annular groove 132 and a frustoconical or conical toothed ring 134 arranged axially offset therefrom in the direction of the attachment tool holder 110. The attachment fastening interface 130 is preferably fully compatible with the fastening interface 50 (see in particular Fig. 3) of the hand tool 10.

[0036] Fig. 3 shows the in the area of ​​the front side 32 of the tool housing 16 of the hand tool 10 of Fig. 1 arranged, machine-side fastening interface 50 of the hand-held power tool 10. This fastening interface 50 comprises an annular groove 52 and a conical toothed ring 54. The fastening interface 50 is preferably compatible or corresponding to the attachment fastening interface 130 of the intermediate attachment 100 (cf. Fig. 1 and Fig. 2), ie the annular groove 52 and the toothed ring 54 are geometrically corresponding to the annular groove 132 and the toothed ring 134 of the attachment fastening interface 130 of Fig. 2. Thus, the same interchangeable and optional tool attachments can be locked both directly to the mounting interface 50 of the handheld power tool 10 and to the attachment mounting interface 130 of the intermediate attachment 100.

[0037] The more detailed preferred structural design of the fastening interface 50 on the front side 32 of the hand-held power tool 10 and thus of the attachment fastening interface 50 is known to the person skilled in the art from DE 10 2007 006 329 A1 (cf. in particular the description with regard to Fig. 1) is sufficiently known, so that its disclosure—to avoid repetition of content—is explicitly and fully incorporated into the description at this point. An optional illumination 140 can be provided in the area of ​​the end face 32 of the tool housing 16 for optimal illumination of a workpiece surface to be machined using the handheld power tool 10.

[0038] Fig. 4 shows the hand tool 10 with the intermediate attachment 100 arranged thereon of Fig. 1. As with Fig. 1, the locking unit 102 of the intermediate attachment 100 is locked to the fastening interface 50 of the hand-held power tool 10 arranged in the region of the front side 32 of the tool housing 16.

[0039] An interchangeable, optional tool attachment 60 has a locking unit 62 that is locked to the attachment mounting interface 130 of the intermediate attachment 100. The optional tool attachment 60 is exemplified here as an angle attachment 64.

[0040] The angle attachment 64 preferably has a Fig. 1 described tool holder 40 of the hand tool 10 and with the Fig. 2, the attachment tool holder 110 of the intermediate attachment 100 is designed to be fully compatible with the attachment tool holder 66. The attachment tool holder 66 is designed here merely by way of example in the manner of a bit holder 68 with a polygonal socket 70 - i.e., for receiving an insert tool 74 designed, for example, in the manner of a screwdriver bit 72 or a drill - which insert tool 74 can be inserted or pushed into the polygonal socket 70 of the angle attachment 64 and locked therein. With regard to the further design details of the attachment tool holder 66, in order to avoid repetition, reference is made in the further course of the description to the description of the tool holder 40 or the attachment tool holder 110.

[0041] The handheld power tool 10 and the intermediate attachment 100 preferably form a tool system 90. Furthermore, according to one embodiment, the optional, interchangeable angle attachment 64 can also be part of this tool system 90.

[0042] The intermediate attachment 100 according to the invention with the integrated torque adjustment device 150 makes it possible for the first time to operate the interchangeable, optional tool attachment 60, designed here as an angle attachment 64, with a torque limiting function that can be freely adjusted by the user.

[0043] Fig. 5 shows the interchangeable, optional tool attachment 60 or the angle attachment 64 of Fig. 4, which illustratively has an attachment housing 80 with a first and a second leg 82, 84, which are arranged at right angles to each other, for example. An angular gear 86 for deflecting the force flow by, for example, 90° is preferably integrated into the attachment housing 80. In the area of ​​the first leg 82, the locking unit 62 is located for selectively locking the tool attachment 60 to the intermediate attachment 100 of Fig. 2 or the fastening interface 50 of the hand tool 10 of Fig. 1. The design of the locking unit 62 corresponds to that of the above-described locking unit 102 of the intermediate attachment 100 of Fig. 2. On the second leg 84 of the attachment housing 80, the attachment tool holder 66 is arranged, in which the screwdriver bit 72 is accommodated as an example here.

[0044] Fig. 6 shows a further interchangeable, optional tool attachment 160, which is designed here as an eccentric attachment 162 with an attachment housing 164 and an offset gear 166 arranged therein. The attachment housing 164 has a locking unit 170 at a first end section 168 for selectively locking the tool attachment 160 to the intermediate attachment 100 of Fig. 2 or at the mounting interface 50 of the hand tool 10 of Fig. 1. On a slightly tapered second end section 172 directed axially away from the first end section 168, an attachment tool holder 174 is arranged, in which the screwdriver bit 72 is inserted here as an example.

[0045] The structural design of the locking unit 170 of the eccentric attachment 162 is in turn preferably fully compatible with the technical design of the locking unit 102 of the intermediate attachment 100 and the locking unit 62 of the angle attachment 64 of Fig. 5 to ensure maximum flexibility within the tool system 90 of Fig. 4 to ensure.

[0046] As described above, the angle attachment 64 can be Fig. 5, the eccentric attachment 162 of Fig. 6 and the intermediate endpaper 100 of Fig. 2 optionally at the mounting interface 50 of the hand tool 10 of Fig.1 or can be secured thereto in a rotationally fixed manner. Furthermore, the angle attachment 64 or the eccentric attachment 162 can be locked to the intermediate attachment 100. Furthermore, the intermediate attachment 100, in its function as a "spacer," allows for an axial extension of the handheld power tool 10, making even more distant workpiece surfaces or workpieces to be machined accessible to a user. As a result, the intermediate attachment 100 according to the invention, in combination with the optional, interchangeable tool attachments 60, 160, allows for a considerable expansion of the application spectrum of the handheld power tool 10.

Claims

[1] Intermediate attachment (100) for a hand-held power tool (10), which has a fastening interface (50) to which an exchangeable tool attachment (60, 160) can be fastened, and which has a tool holder (40) in which an associated insert tool (74, 120) can be received, wherein the intermediate attachment (100) has a locking unit (102) for locking to the fastening interface (50) of the hand-held power tool (10) and an attachment tool holder (110) for receiving an associated insert tool (74, 120), characterized by in that the intermediate attachment (100) has an attachment fastening interface (130) to which an exchangeable tool attachment (60, 160) can be locked, wherein the attachment fastening interface (130) is designed to be compatible with the fastening interface (50) of the hand-held power tool (10). [2] Intermediate attachment according to claim 1, characterized bythat a device (150) for adjusting a torque is provided. [3] Intermediate attachment according to claim 1 or 2, characterized by that the locking unit (102) is designed for anti-twist locking at the fastening interface (50) of the hand-held power tool (10). [4] Intermediate attachment according to one of the preceding claims, characterized by that the attachment fastening interface (130) is designed for the rotationally secured fastening of the exchangeable tool attachment (60, 160). [5] Intermediate attachment according to one of the preceding claims, characterized by that the interchangeable tool attachment (60) is an angle attachment (64). [6] Intermediate attachment according to one of claims 1 to 4, characterized by that the interchangeable tool attachment (160) is an eccentric attachment (162). [7] Tool system (90) with a hand-held power tool (10) and an intermediate attachment (100), wherein the hand-held power tool (10) has a fastening interface (50) to which an exchangeable tool attachment (60, 160) can be fastened, and a tool holder (40) in which an associated insert tool (74, 120) can be received, and wherein the intermediate attachment (100) has a locking unit (102) for locking to the fastening interface (50) of the hand-held power tool (10) and an attachment tool holder (110) for receiving an associated insert tool (74, 120), characterized by in that the intermediate attachment (100) has an attachment fastening interface (130) to which an exchangeable tool attachment (60, 160) can be locked, wherein the attachment fastening interface (130) is designed to be compatible with the fastening interface (50) of the hand-held power tool (10). [8] Tool system according to claim 7, characterized bythat the tool system (90) has at least one interchangeable tool attachment (60, 160), in particular an angle and / or an eccentric attachment (64, 162). [9] Tool system according to claim 8, characterized by that the interchangeable tool attachment (60, 160) can be fastened to the fastening interface (50) of the hand-held power tool (10) or the attachment fastening interface (130) of the intermediate attachment (100). [10] Tool system according to one of claims 7 to 9, characterized by that the intermediate attachment (100) has a device (150) for adjusting a torque.

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