CN209021994U - Hand held power machine and attachment - Google Patents

Abstract

A hand-held power tool (100) with a tool attachment interface (140) for a rotationally fixed connection to a fixing interface (200) of a tool attachment (202) and with a tool attachment (204) and an impact mechanism ), the plug-in tool (400, 430, 434, 438) can be received in the tool receptacle in a rotationally fixed manner, and the impact mechanism is used for the tool receptacle (204) in the impact operation associated with the hand-held power tool (100). The tool attachment interface (140) is configured with an at least substantially hollow-cylindrical handle sleeve (142) and an at least substantially hollow-cylindrical retaining element of the driven element of the hammer mechanism to drive the plug-in tool impact-type in the axial direction of the impact mechanism. section, wherein the outer centering section with the smaller diameter adjoins, starting from the free end of the holding section, the outer guide section which is located further inward in the axial direction and has a larger diameter.

Description

Handheld Power Tools and Tool Accessories

technical field

The utility model relates to a hand-held power tool, which is provided with a tool attachment interface and an impact mechanism, the tool attachment interface is used for being connected with a fixed interface of the tool attachment in a twist-resistant manner, the tool attachment has a tool receiving part, and a plug-in tool In the tool receptacle, which can be received in a rotationally fixed manner, the striking mechanism serves to drive the insertion tool in an impact-like manner in the axial direction of the tool receptacle during striking operation associated with the hand-held power tool. Furthermore, the invention relates to a tool attachment having a tool receptacle for receiving a plug-in tool in a rotationally fixed manner and a fastening interface for attaching the tool attachment to a tool attachment interface of such a hand-held power tool.

Background technique

Hand-held power tools of the hammer drill type are known from the prior art, in which a hammer-type hammer mechanism with a percussion bolt or a hammer head drives the tools which are respectively arranged in the respective tool receptacles percussively and/or rotationally. . Today, impact drills with less power can often be connected with different tool attachments. As a result, the tool attachment can be easily replaced in the event of wear. Furthermore, such a percussion drill can be combined with various tool attachments which, in order to extend, for example, the range of use of tools are provided with interface geometries implemented differently from the SDS-Plus interface (for example round shanks or shanks of the HEX type). ).

Utility model content

The utility model relates to a hand-held power tool, which is provided with a tool attachment interface and an impact mechanism, the tool attachment interface is used for being connected with a fixed interface of the tool attachment in a twist-resistant manner, the tool attachment has a tool receiving part, and a plug-in tool In the tool receptacle, which can be received in a rotationally fixed manner, the striking mechanism serves to drive the insertion tool in an impact-like manner in the axial direction of the tool receptacle during striking operation associated with the hand-held power tool. The tool attachment interface is formed with an at least substantially hollow-cylindrical handle sleeve and an at least substantially hollow-cylindrical holding section of the driven element of the impact mechanism, wherein the outer centering section with the smaller diameter extends from the holding section. Starting from the free end, it engages on the outer guide section which is located further in the axial direction and has a larger diameter.

Therefore, the present invention makes it possible to provide a hand-held power tool in which a bolt or stepped bolt according to a stepped hollow cylinder is produced which produces a tool attachment received on the holding section. Improved concentricity properties or radial runout properties and improved contamination resistance properties due to the type of construction of the retaining section. Furthermore, a reliable centering of the tool attachment on the holding section of the tool attachment interface of the hand-held power tool is produced. The impact mechanism is preferably implemented with a hammer-type impact mechanism in order to generate a relatively high impact energy. The smaller diameter section of the holding section is used for pre-centering when the kit is attached. After the assembly has been completed, both the smaller diameter section of the holding section and the larger diameter section center the tool attachment on the tool attachment interface of the hand-held power tool.

An annular shoulder, preferably with a radial height in the range of 0.1 mm to 1.0 mm, extends between the outer centering section and the outer guide section of the retaining section. Thus, the production tool attachment is received precisely on the holding section.

In a preferred configuration, the driven element is the hammer tube of the impact mechanism. Therefore, a structurally simple construction is ensured.

In a technically advantageous development, the handle sleeve has a plurality of detent hooks which are arranged at a uniform distance from one another on the peripheral side and are formed integrally. As a result, a separate component otherwise required for fixing the handle sleeve is dispensed with.

According to another embodiment, the detent hook engages a crimping sleeve connected to the hammer tube or a radially outwardly directed annular flange formed integrally with the hammer tube in order to fasten the handle sleeve. Thus, the heat input from the rotating hammer tube is furthermore reduced.

Preferably, the tool attachment has an at least approximately hollow-cylindrical support body, at a first end of which the tool receptacle is formed and at a second end of the support body, which is oriented away from the first end The fastening interface has an at least substantially hollow-cylindrical receiving section. This results in a structurally simple, durable and robust embodiment of the tool attachment.

According to an advantageous development, in order to connect the fastening interface of the tool attachment with the tool attachment interface of the hand-held power tool, the receiving section can be received on the holding section in a form-locking manner at least in regions and without play. This results in an improved concentricity of the plug-in tool inserted into the tool receptacle of the tool attachment.

The outer diameter of the outer guide section of the retaining section is preferably dimensioned larger than the diameter of the shank of the insertion tool. This results in an improved concentricity characteristic of the plug-in tool inserted into the tool receptacle of the tool attachment while the mechanical load capacity of the tool attachment connected to the hand-held power tool is at the same time relatively high. In the case of a plug-in tool whose shank has a so-called SDS-Plus interface or is of the SDS-Plus type, the outer diameter of the shank is generally about 10 mm.

According to a preferred configuration, the tool receptacle has a spring-loaded, hollow-cylindrical locking sleeve for locking the plug-in tool in the tool receptacle. Unintentional unlocking of the tool attachment from the hand-held power tool on the part of the user is thus excluded.

The handle sleeve is preferably acted on the tool attachment in the axial direction by means of a compression spring, and the handle sleeve can be moved in the axial direction against the return force exerted by the compression spring in the direction of the housing end side of the hand-held power tool in order to The tool attachment is locked or unlocked with the holding section of the tool attachment interface. This results in a secure and ergonomic locking and unlocking of the tool attachment on the hand-held power tool that is intuitive to the user and ergonomic.

Preferably, the handle of the plug-in tool is constructed in particular according to the type of SDS-Plus interface. In this way, a plug-in tool for maximum expansion of the hammer drill can be inserted into the tool receptacle of the tool attachment. Alternatively, the tool receptacle of the tool attachment can be designed to receive any desired plug-in tool, the shank of which is embodied, for example, according to the type of known SDS-Quick interface or as a conventional round shank.

In a technically advantageous refinement, the striking mechanism has a striking bolt which is designed to actuate the insertion tool in a percussive manner. The impact energy generated by the impact mechanism is coupled directly into the shank of the plug-in tool with a high effective coefficient of action by means of the impact pin, which is received coaxially in the hammer tube and can be moved axially therein.

According to a technically advantageous configuration, the tool attachment interface has an at least substantially radial arrangement of the length-critical structural elements, in particular the retaining section and the sealing ring of the striker bolt. As a result, the axial structural length of the hand-held power tool can be further reduced, in particular in order to increase the user's operating comfort and ergonomics.

Furthermore, the present invention relates to a tool attachment having a tool receptacle for receiving a plug-in tool in a rotationally fixed manner, a fastening interface for attaching the tool attachment to a tool attachment interface of a hand-held power tool, and a During the impact operation associated with the hand-held power tool, the impact mechanism of the plug-in tool is driven in a percussive manner in the axial direction of the tool receptacle. The tool attachment has an at least approximately hollow-cylindrical support body, on a first end of which a tool receptacle is formed and on a second end of the support body, which is oriented away from the first end, a band is formed There is a fastening interface with an at least substantially hollow-cylindrical receiving section, the inner guide section of which, starting from the free end of the receiving section, with a larger diameter, adjoins the axially further inner guide section and has a larger diameter. on the small inner centering segment. As a result, a tool attachment with improved concentricity properties and a mechanically secure fit on the tool attachment interface of the hand-held power tool can be achieved.

Description of drawings

The invention is explained in detail in the following description on the basis of the embodiments shown in the drawings. The attached figure shows:

FIG. 1 shows a schematic illustration of a hand-held power tool with a tool attachment interface and an exemplary plug-in tool according to an embodiment,

FIG. 2 shows an enlarged perspective view of the retaining section of the tool attachment interface of FIG. 1 ,

FIG. 3 shows a longitudinal section of the tool attachment interface of FIG. 1 with the tool attachment fastened thereon,

Figure 4 shows a partial longitudinal section of another embodiment of a tool accessory interface having a tool accessory secured thereon, and

FIG. 5 shows a longitudinal section of the handle sleeve of the tool accessory interface of FIGS. 1 and 3 .

Detailed ways

FIG. 1 shows a hand-held power tool 100 , which is designed as an example of a hammer drill and has a housing 106 in which a drive unit 111 of an electric motor 110 is arranged. The drive unit 111 can be switched on and off at least via an electrical switch 108 arranged on the handle 105 and is used to generate a torque, which is transmitted via a transmission 120 to the striking mechanism 122 . An additional holding handle 114 is preferably provided in the region of the housing end face 107 for the user to securely guide the hand-held power tool 100 with both hands. The impact mechanism 122 can be realized, for example, as a pneumatic impact mechanism and/or as a hammer impact mechanism. Here, the current supply of the electric motor 110 of the drive unit 111 takes place by way of example by means of the mains line 112 .

However, the invention is not limited to impact drills that can be operated on a grid, but can be used in a variety of different power tools, regardless of whether the power tools are implemented as grid-dependent or battery-operated. For example, the hand-held power tool 100 can be designed not only as a hammer drill, but alternatively, for example, also according to the type of battery driver with an integrated hammer hammer mechanism.

The hand-held power tool 100 preferably has a tool attachment interface 140 in the region of the housing end face 107 for a rotationally fixed connection to the fastening interface 200 of the tool attachment 202 . The tool attachment 202 is, for its part, equipped with tool receptacles 204 for receiving various plug-in tools. When the tool attachment 202 is connected to the tool attachment interface 140 of the hand-held power tool 100 , the plug-in tool received in the tool receptacle 204 can be rotated and/or when the electric motor 110 is switched on by means of the manual switch 108 . Or driven by the transmission 120 and/or the impact mechanism 122 in a percussive manner. The tool attachment interface 140 can be actuated or locked and unlocked by means of an axially movable, preferably substantially hollow-cylindrical handle sleeve 142 , so that the user can easily and quickly connect the tool attachment 202 to the hand-held power tool 100 . Connect and separate from it.

In this case, the tool receptacle 204 of the tool attachment 202 is preferably designed to receive a plug-in tool 400 with a coupling contour 404 according to the requirements of the so-called SDS-Plus type, which can be connected to the tool receptacle 204 . Torsionally connected handle 402 . Furthermore, the coupling contour 404 of the SDS-Plus plug-in tool 400 has two longitudinal grooves 406 , 408 located at diametrically opposite ends, which are each formed open or open out in the region of the first end 410 . The two elliptical recesses 412 , 414 are also inserted into the shank 402 of the insertion tool 400 at diametrically opposite ends relative to each other, offset by 90° in each case with respect to the two longitudinal grooves 406 , 408 on the peripheral side. The two elliptical recesses 412 , 414 with rounded inner corners or crescents each have a central section 416 , 418 with an approximately semicircular cross-sectional geometry, two elliptical recesses 412 , 414 The two truncated spherical end sections each adjoin the cross-sectional geometry. Between the shank 402 and the second end 420 , which points away from the first end 410 , a machining section 422 is formed on the insert tool 400 , which machining section can, for example, comprise at least one tool for carrying out the machining. swirls or spirals of material being removed from the workpiece, carbide inserts (or carbide platelets) for increasing the service life of the insert tool 400, and the like. Preferably, the diameter D of the shank 402 of the insert tool 400 of the SDS-Plus type is at least substantially 10 mm large.

Furthermore, the hand-held power tool 100 can be used or combined with other not shown embodiments of a tool attachment with a tool receptacle. These tool attachments can be configured to receive other plug-in tools, such as plug-in tools 430 with so-called SDS-Quick-type shanks 432, plug-in tools 434 with so-called Hex-type shanks 436, or simple cylindrical Insertion tool 438 with shank 440 of the round or round shank type.

The tool attachment 202 , which can be connected to the hand-held power tool 100 and detached again, can easily be replaced with a new tool attachment in the event of wear. Furthermore, tool attachments with tool receptacles for SDS-Plus, SDS-Quick, Hex, or conventional round-shank plug-in tools in each case enable the use of the hand-held power tool 100 in the most diverse application scenarios. Universal application.

FIG. 2 shows the tool attachment interface 140 of FIG. 1 , which is preferably realized as an at least substantially hollow-cylindrical holding section 144 with the driven element 146 of the striking mechanism 122 of FIG. 1 . The smaller diameter outer centering section 148 of the retaining section 144 preferably extends from the preferably slightly chamfered free end 150 of the retaining section 144 to the axially further inner and larger diameter of the retaining section 144 . on the outer guide section 152. Here, the terms "smaller diameter" and "larger diameter" may be considered relative size specifications in direct relation to each other, ie the outer centering section 148 has a smaller outer diameter than the outer guide section 152 .

An annular shoulder 154 having a relatively small radial height H extends between the smaller diameter outer centering section 148 and the larger diameter outer guide section 152 . Preferably the height H is moved within a range between 0.1 and 1.0 mm including the mentioned interval boundaries. The radial flange 156 , which is preferably formed in one piece with the output element 146 , has an annular abutment surface 158 , which points toward the free end 150 of the holding section 144 and is preferably used for inserting a tool attachment onto the holding section. 144 on the axial travel limit.

By guiding the tool attachment ( 202 in FIG. 1 ) on the outer guide section 152 , the guide ratio, ie the quantitative ratio between the axial guide length (not shown) and the outer diameter D _A1 of the outer guide section 152 , can be maintained The relatively small size results in a small axial length of the tool attachment interface 140 and at the same time the hand-held power tool ( 100 in FIG. 1 ). For this purpose, the dimensions of the outer diameter D _A1 of the larger diameter outer guide section 152 are preferably much larger than the outer diameter of the shank of the insertion tool, whereby improved concentricity properties occur. The smaller diameter outer centering section 148 serves at least for radial centering of tool attachments to be fitted onto the holding section 144 .

In the outer centering section 148 with the smaller diameter, preferably at least three receiving cutouts 160 , 162 , 164 are provided which are preferably truncated cone-shaped and are preferably arranged evenly spaced relative to each other on the circumferential side. The longitudinal grooves 166 , 168 , 170 respectively extend from each of the three receiving cutouts 160 , 162 , 164 within the smaller diameter outer centering section 148 to the chamfered free end 150 of the retaining section 144 . The radial depths of the longitudinal grooves 166 , 168 , 170 , which are not indicated for the sake of clarity in the drawing, are in each case smaller than the radial depths of the receiving cutouts 160 , 162 , 164 which are respectively assigned to them.

FIG. 3 shows the tool attachment interface 140 of the hand-held power tool 100 of FIG. 1 with the tool attachment 202 of FIG. 1 fastened to it. In the drawing area I below the longitudinal center axis 198 , the fastening interface 200 of the tool attachment 202 is pushed onto the holding section 144 of the tool attachment interface 140 of the hand-held power tool 100 in the axial direction as far as the impact mechanism (see FIG. 1 ). The radial flange 156 of the retaining section 144 of the driven element 146 of the hammer tube 124 , referenced 122 ), is, however, not mechanically locked with the retaining section 144 . In contrast, in the drawing area II above the longitudinal center axis 198 , the fastening interface 200 of the tool attachment 202 and the tool attachment interface 140 are mechanically locked to each other, ie the tool attachment 202 is firmly connected to the hand-held power tool 100 . The locking and unlocking or connecting and releasing of the tool attachment 202 to the housing end face 107 of the hand-held power tool 100 is carried out by corresponding axial displacement of the handle sleeve 142 by the user along the double arrow 199 . Furthermore, in the lower drawing area I, the plug-in tool 400 is inserted into the tool receptacle 204 only completely in the axial direction, but is not locked in a form-locking manner therewith, whereas in the upper drawing area II, the plug-in The tool 400 is positively locked with the tool receptacle 204 .

The tool attachment 202 preferably has an at least substantially hollow-cylindrical solid support body 206 , a preferably tubular tool receptacle 204 is integrally formed on the first end 208 of this support body and preferably has an at least substantially hollow-cylindrical receptacle. The fixing interface 200 of the section 212 is formed on a second end 210 of the support body which is oriented axially away from the first end 208 . In order for the fastening interface 200 of the tool attachment 202 to be mechanically and firmly connected to the tool attachment interface 140 on the hand-held power tool 100 , the receiving section 212 can preferably be received at the tool attachment interface 140 in a form-locking and play-free manner at least in regions. on the holding section 144. This results in relatively precise guidance and improved concentricity properties of the insert tool 400 of the SDS-Plus type, which is inserted here only by way of example in the tool receptacle 204 of the tool attachment 202 .

Starting from the free end 214 of the receiving section 212 , which preferably has a cylindrical inner guide section 216 with a larger diameter, preferably further in the axial direction of the receiving section 212 of the bearing body 206 of the tool attachment 202 An inner, cylindrical inner centering section 218 with a smaller diameter, which is located on the inside, engages the inner guide section. Alternatively to this, the inner guide section 216 and the inner centering section 218 can also be configured with a uniform diameter.

In this case, the inner guide section 216 with a larger diameter preferably has an inner diameter D _I , which is dimensioned in such a way that, ideally, it is ensured that the gap is received in a reduced or "suction" manner On the larger diameter outer guide section 152 of the holding section 144 of the tool attachment interface 140 , said outer guide section has a diameter D _A1 . In addition, an efficient self-cleaning effect of the tool attachment interface 140 of the tool attachment 202 and of the fastening interface 200 on the hand-held power tool 100 is produced due to the narrowest possible component pairing.

Preferably, at least three recesses, preferably evenly spaced from one another on the circumferential side, are introduced into the receiving section 212 of the tool attachment 202 , of which only two recesses 220 , 222 are here. visible. A locking ball is preferably received in each of the three recesses and is guided in a radially displaceable manner, of which also only two locking balls 224 , 226 are here. visible.

When the tool attachment 202 is axially pushed onto the holding section 144 of the tool attachment interface 140 of the hand-held power tool 100 , the locking balls 224 , 226 , including the invisible locking balls, are each pressed radially outwards, wherein, The illustration in the lower drawing area I shows that the radial exit of the locking ball 226 from the recess 220 is prevented, for example by the hollow-cylindrical radial collar 172 of the handle sleeve 142 . The same applies to the locking balls 224 in the unlocked state of the tool attachment 202 , which is described in the lower drawing area I, as well as the other locking balls that are not visible and their associated recesses.

When the tool attachment 202 is inserted in the axial direction, the locking balls 224 , 226 preferably first rest on the chamfered, smaller-diameter outer centering section 148 , preferably only when the tool attachment 202 is twisted in such a way that the locking Further insertion is possible when the balls 224 , 226 respectively enter circumferentially into longitudinal grooves (see FIG. 2 , reference numerals 166 , 168 , 170 ) of the holding section 144 which are not indicated for better clarity in the drawing.

The hand-held power tool-side handle sleeve 142 is preferably loaded axially toward the tool attachment 202 or in a direction oriented away from the housing end 107 of the hand-held power tool 100 by means of the compression spring 174 . The compression spring 174 is preferably clamped on both sides between the crimping sleeve 176 and the inner hollow cylindrical support ring 178 of the handle sleeve 142 which is fastened to the handle sleeve 142 . Here, the crimping sleeve 176 is preferably fixed at least in the axial direction in the annular groove 182 of the output element 146 or the hammer tube 124 by means of a fixing ring 180 . In addition, undrawn noses may be provided on the hemming sleeve 176 that prevent relative rotational movement between the handle sleeve 142 and the hemming sleeve 176 such that wall contact may occur at the handle sleeve 142 Only relative movement between the crimping sleeve 176 and the hammer tube 124 can occur, which results in reduced wear.

The handle sleeve 142 is preferably formed in one piece with the optionally fiber-reinforced plastic material and furthermore has a plurality of snap-in hooks that are designed in one piece and are directed radially inward, of which only only the ones shown here are shown here. Two snap hooks 184, 186. Thus, assembly is furthermore facilitated and possible heat input from the hammer tube 124 is reduced. The latching hooks 184 , 186 serve to fasten the handle sleeve 142 to the beading sleeve 176 , which for this purpose has a small flange flange 188 or rim oriented radially outwards, The latching hooks 184 , 186 of the handle sleeve 142 hook onto the flange flange or rim, which is representatively explained with reference to the latching hook 184 . Preferably, the crimp sleeve 176 is realized by a one-piece panel modification.

For example, the locking balls 224 (as is apparent in the upper drawing area II) are held radially in the receiving cutouts 160 of the holding section 144 and the recesses 220 of the tool attachment 202 by means of a preferably metallic support ring 178 or It is prevented from moving radially outwards to a greater extent, whereby the tool attachment 202 is effectively locked on the hand-held power tool 100 by means of a form-locking connection with the tool attachment interface 140 .

By pushing the handle sleeve 142 back in the axial direction towards the housing end side 107 (as shown in the lower drawing area I), the locking ball 226 is released radially, so that the tool attachment 202 can be When the power tool 100 is unlocked, the locking ball can emerge radially outwards from the receiving cutout 162 of the holding section 144 into the cutout 222 , wherein the radial flange 172 of the handle sleeve 142 forms a space for the locking ball The radial travel limit necessary for the radial outward movement of 226 . Due to the locking balls radially emerging from the receiving cutout of the holding section 144 , the tool attachment 202 can be held by the user from the tool attachment interface 140 of the hand-held power tool 100 in the unlocked state shown in the drawing area I. Section 144 is removed.

A shoulder 230 is preferably formed between the receptacle section 212 of the tool attachment 202 and the substantially tubular clamping section 228 of the tool receptacle 204 for the insertion tool 400 . Furthermore, preferably the clamping section 228 of the tool receiver 204 has two elliptical cutouts 232 , 234 arranged at diametrically opposite ends. The locking ball 236 is located in the oval cutout 232 and the locking ball 238 is located in the cutout 234 . The essentially conical locking sleeve 240 , which is axially displaceable along the double arrow 197 , preferably also has a radially inner support ring 242 for radially locking the locking balls 236 , 238 . The locking sleeve 240 is biased towards the insertion tool 400 by means of a compression spring 244 , the compression spring 244 being supported on the shoulder 230 and a substantially hollow truncated cone-shaped, bearing ring 242 for guiding the pressure between the pads 246 of the spring 244 . Furthermore, in order to limit the travel of the handle sleeve 240 in the axial direction towards the insertion tool 400 , a protective cover 248 is preferably provided, which is preferably fastened in the axial direction on the tool receptacle by means of two fastening rings 250 , 251 . 204 in the region of the first end 208 of the support body 206 .

Furthermore, the locking sleeve 240 preferably has an annular groove 254 at its free end, which is not indicated for the sake of clarity in the drawing, and which points towards the handle sleeve 142 or the housing end side 107 , and the handle sleeve 142 is connected to the housing end. The side 107 , which is directed away from the annular wall 256 , sinks into the annular groove at least in sections. Because the annular groove 254 partially overlaps the annular wall 256 , it is difficult to at least allow contaminants, such as foreign particles and/or liquids, to enter the area inside the tool attachment interface 140 and the fixed interface 200 of the tool attachment 202 .

The shank 402 of the insert tool 400 of the SDS-Plus type has two oval recesses 412, 414 arranged at diametrically opposite ends (see especially FIG. 1). In the lower drawing area I, the locking ball 238 emerges radially outward from the oval recess 414 and locks approximately flush with the cylindrical inner surface 258 of the clamping section 228 of the tool receptacle 204 . Here, the locking ball 238 is also located at least partially inside the oval cutout 234 of the clamping section 228 and rests radially on the outside against the circumferential, inner corners of the locking sleeve 240 , which are rounded on the inside. On start ramp 260. The insert tool 400 is thus in the unlocked state in the lower drawing area I and can be pulled out of the tool receptacle 204 of the tool attachment 202 by the user with little effort. Preferably, the starting ramp 260 engages axially inwardly and radially to the cylindrical inner surface 262 of the support ring 242 of the locking sleeve 240 of the tool receiver 204 flush or without transition. The inner diameter of the rounded starting ramp 260 , which is not indicated for the sake of clarity in the drawing, preferably decreases non-linearly or curvedly starting from the support ring 242 towards the first end 208 of the carrier 206 of the tool receptacle 204 .

In order to proceed from the locked state of the tool receptacle 204 , which is shown in the upper drawing area II, to reach the unlocked state again in order to remove the insert tool 400 , it is preferably necessary to move the locking sleeve 240 against the force of the compression spring 244 . The spring force pulls back the housing end 107 or the handle sleeve 142 of the hand-held power tool 100 . As a result of this, a radial free space is created by the starting ramp 260 of the locking sleeve 240 , which is also moved inwards in the axial direction, which enables a radial displacement of the two locking balls 236 , 238 . In turn, a complete release of the insert tool 400 in the tool receptacle 204 can be achieved.

On the contrary, since the axially retracted locking sleeve 240 is released or released when the insertion tool 400 is fully inserted into the tool receiver 204 (as shown in drawing area II), by radially inwardly The locking balls 236 , 238 moved back into the elliptical recesses 412 , 414 of the insertion tool 400 effect the locking of the insertion tool 400 in the tool receptacle 204 . Here, as can be seen from the locking balls 236 in the upper drawing area II, the radial displacement of the locking balls 236 is preferably prevented by the support ring 242 , whereby the insertion tool 400 is provided by a reliable mechanical The form-fit connection is locked inside the tool receiver 204 .

The torque transmission between the insertion tool 400 and the tool receptacle 204 preferably takes place by means of projections, not shown here, which are directed radially inward and are formed on the shank 402 at the diametrically opposite end, said projections The two longitudinal grooves (see FIG. 1 , reference numerals 406 , 408 ) of an insertion tool 400 of the SDS-Plus type, which are shown here only by way of example, are preferably fitted at least partially.

If necessary, the impact on the insertion tool 400 can be achieved by means of the impact pin 126 received coaxially in the hammer tube 124 with the impact energy generated by the impact mechanism (122 in FIG. 1 ) acting mainly in the axial direction. Loading of the rounded first end 410 of the 100°C enables particularly light and fast drilling advancement by means of the insert tool 400 , for example in mineral-containing workpieces. Here, the elliptical recesses 412 , 414 in the shank 402 of the insertion tool 400 in combination with the longitudinal grooves formed therein allow the insertion tool 400 to rotate from the hammer tube 124 to the insertion tool 400 during impact operation. The torque transfer is most efficient while moving in the axial direction without hindrance.

In order to ensure an improved sealing action between the impact bolt 126 and the driven element 146 , which is designed as the hammer tube 124 , a sealing ring 194 made of an elastic material can be provided in the region of the inner shoulder 192 .

FIG. 4 shows an alternative embodiment of the tool attachment interface 300 of the hand-held power tool 100 from FIG. 1 , which in turn has an axially displaceable handle sleeve 142 with an axially movable handle sleeve 142 . Radial flange 172 directed radially inwardly for locking and unlocking with fixed interface 200 of tool attachment 202 of FIG. 1 . In the here merely illustratively actuated state of the handle sleeve 142 , the tool attachment 202 , which is fully fitted onto the small, alternatively configured holding section 302 , is unlocked from the tool attachment interface 300 and can therefore be used by the user along the The housing end 107 of the hand-held power tool 100 is removed away from the orientation. Here, a plug-in tool 400 of the SDS-Plus type is exemplarily received in the tool attachment 202 .

The preferably at least partial form-locking mechanical locking between the further embodiment of the tool attachment interface 300 of the hand-held power tool 100 and the fixing interface 200 of the tool attachment 202 is again achieved by means of a locking ball, which is described Of the locking balls, only one locking ball 226 is shown here. To lock the tool attachment 202 on the tool attachment interface 300 , the locking ball 226 can be pressed radially inwards into the receiving cutout 304 and can be locked therein by means of the support ring 178 of the handle sleeve 142 . The receiving cutout 304 is preferably constructed identically in structure to the receiving cutout shown in FIGS. 2 and 3 of the holding section 302 there. Of the preferably at least three receiving cutouts of the holding section 302 , only the receiving cutouts 304 are shown here to represent all the remaining receiving cutouts.

The driven element 146 is in turn the hammer tube 124 , wherein, as a major difference from the embodiment of FIG. 3 , its holding section 302 has a solid ring, ie constructed in one piece with the hammer tube 124 , which is directed radially outwards Type flange 306. The annular flange 306 is preferably designed in such a way that the detent hooks 186 , which are only visible here and are integrally formed with the handle sleeve 142 and which are formed at the end on the holding arms ( 344 in FIG. 5 ), can engage the annular Flange 306 to secure handle sleeve 142 to hammer tube 124. The same applies to all other detent hooks of handle sleeve 142 , which are designed to be evenly offset on the circumferential side relative to detent hooks 186 , but are not shown here.

Thereby, the irreplaceable crimping sleeve, which is also necessary in the embodiment of FIG. 3 , can be dispensed with. The compression spring 174 for preloading or charging the handle sleeve 124 in the axial direction in a direction oriented away from the housing end face 107 of the hand tool 100 is preferably supported on a solid holding section 302 of the tool attachment interface 300 . Between ring flange 306 and support ring 178 of handle sleeve 142 .

Along the length-critical line 196 , the preferably inner structural elements of the tool attachment interface 300 (eg the retaining section 302 and the sealing ring 194 of the striker 126 ) are arranged at least substantially radially opposite each other or in the "longitudinal" direction. parallel". Due to the at least partial “parallel” of the structural elements of the tool attachment interface 300 , more installation space is available for the structural elements, so that the axial structural length of the hand-held power tool 100 can be further reduced in order to improve the operability or ergonomics. The parallelism of the inner structural elements is substantially achieved by a correspondingly suitable increase in the outer diameter D _A2 of the larger-diameter outer guide section 303 of the holding section 302 of the tool attachment interface 300 . The outer diameter D _A2 lies at least approximately in the range of the outer diameter _DH of the hammer tube 124 of the output element 146 of the hand-held power tool 100 in the size class. Furthermore, the diameter D _S of the impact pin 126 preferably substantially corresponds to the diameter D of the shank 402 of the insert tool 400 of the SDS-Plus type. The same structural dimensional basis applies analogously to the first embodiment of the tool attachment interface according to FIG. 3 .

The functional principle of the mechanical form-locking locking between the tool attachment 202 and the tool attachment interface 300 of the hand-held power tool 100 is the same as that explained in the context of FIG. 3 , in the tool attachment 202 and there. The coupling mechanism between the tool accessory interfaces 140 is consistent, so in this case please refer to the explanation in FIG. 3 for the sake of brevity and brevity of explanation. The same applies to the working principle of the tool receptacle 204 and the axially displaceable locking sleeve 240 during its operation, which interacts with the locking ball 238 , which is only shown here, as well as the end-side attachment to the tool. The working principle of the protective cover 248 on the receiving part 204 .

5 illustrates the handle sleeve 142 of FIGS. 1 and 3 , which preferably has an at least substantially hollow cylindrical base body 330 having a first end 332 and a second end 334 , the base body The configuration is preferably rotationally symmetrical with respect to the longitudinal center axis 198 . The base body 330 of the handle sleeve 142 preferably has a larger-diameter, substantially hollow-cylindrical section 336 , which is further intended to be gripped by the user, and a smaller-diameter, substantially hollow-cylindrical section 338 , a shoulder 340 . extends between the segments.

A plurality of axial latching hooks are preferably formed in the region of the shoulders 340 of the handle sleeve 142 , which are oriented towards the first end 332 of the base body 330 of the handle sleeve 142 , and in which the latching hooks are located. Of the hooks, only two detent hooks 184 , 186 are provided with reference numerals representing all the remaining detent hooks. The detent hook 184 preferably has a retaining arm 342 extending parallel to the longitudinal center axis 198 , and the detent hook 186 correspondingly has a retaining arm 344 . On the retaining arms 342 , 344 of the detent hooks 184 , 186 , preferably radially inwardly directed detent projections 346 , 348 are respectively formed, the cross-sectional geometry of which corresponds to the cross-section of a right-angled trapezoid. The geometry is consistent.

Furthermore, the radial flange 172 is integral with the handle sleeve 142 and is coaxially surrounded by its smaller diameter section 338 and is molded radially inward in the region of the shoulder 340 . A preferably metallic support ring (see FIG. 3 , reference numeral 178 ), not shown here, bears here against the inner contour 350 of the smaller-diameter section 338 and against the first surface facing the handle sleeve 142 . The end 332 points on the annular contact surface 352 .

Claims (14)

1. A hand-held power tool (100) having a tool attachment interface (140, 300) and an impact mechanism (122), the tool attachment interface being used to resist torsion with a fixing interface (200) of the tool attachment (202) ground connection, the tool attachment has a tool receptacle ( 204 ) in which a plug-in tool ( 400 , 430 , 434 , 438 ) can be received in a rotationally fixed manner, the impact mechanism being used for The insertion tool (400, 430, 434, 438) is driven impulsive in the axial direction of the tool receptacle (204) during the impact operation of the hand-held power tool (100), characterized in that the The tool attachment interface (140, 300) is configured with an at least substantially hollow-cylindrical handle sleeve (142) and an at least substantially hollow-cylindrical holding section of the driven element (146) of the impact mechanism (122) , wherein, starting from the free end ( 150 ) of the holding section, the smaller diameter outer centering section ( 148 ) adjoins the axially further inner and larger diameter outer guide section. 2 . The hand-held power tool according to claim 1 , wherein an annular shoulder ( 154 ) with a radial height (H) in the range of 0.1 mm to 1.0 mm is outside the holding section. 3 . Extending between the centering section (148) and the outer guide section. 3 . The hand-held power tool according to claim 1 , wherein the driven element ( 146 ) is a hammer tube ( 124 ) of the striking mechanism ( 122 ). 4 . 4 . The hand-held power tool according to claim 3 , wherein the handle sleeve ( 142 ) has a plurality of latching hooks ( 184 , which are arranged evenly spaced apart from one another on the circumferential side and are designed in one piece). 5 . , 186). 5 . The hand-held power tool according to claim 4 , wherein the latching hooks ( 184 , 186 ) hook on a crimping sleeve ( 176 ) connected to the hammer tube ( 124 ) or with all The hammer tube (124) is integrally constructed with a radially outwardly directed annular flange (306) to secure the handle sleeve (142). 6 . The hand-held power tool according to claim 1 , wherein the tool attachment ( 202 ) has an at least approximately hollow-cylindrical support body ( 206 ) at a first end of the support body. 7 . The tool receptacle ( 204 ) is formed on ( 208 ) and a second end ( 210 ) of the support body, which is oriented away from the first end ( 208 ), is formed with an at least substantially hollow cylinder. The fixed interface (200) of the shaped receiving section (212). 7. The hand-held power tool according to claim 6, characterized in that, in order to connect the fixing interface (200) of the tool attachment (202) with the tool attachment interface (140) of the hand-held power tool (100), 300 ) connection, the receiving section ( 212 ) can be received on the holding section ( 144 , 302 ) in a form-locking manner at least in regions and without play. 8 . The hand-held power tool according to claim 7 , wherein the dimension ratio of the outer diameter (D _A1,2 ) of the outer guide section ( 152 , 303 ) of the holding section ( 144 , 302 ) The diameter (D) of the shank (402) of the insertion tool (400, 430, 434, 438) is large. 9 . The hand-held power tool according to claim 1 , wherein the tool receptacle ( 204 ) has a spring-loaded, hollow-cylindrical locking sleeve ( 240 ) for the Insertion tools (400, 430, 434, 438) are locked in the tool receiver (204). 10 . The hand-held power tool as claimed in claim 1 , wherein the handle sleeve ( 142 ) is axially loaded towards the tool attachment ( 202 ) by means of a compression spring ( 174 ) and the The handle sleeve (142) can be moved in the axial direction towards the housing end (107) of the hand-held power tool (100) against the return force exerted by the compression spring (174), in order to enable all the The tool attachment (202) is locked or unlocked with the retaining section (144, 302) of the tool attachment interface (140, 300). 11 . The hand-held power tool according to claim 1 , wherein the handle ( 402 ) of the plug-in tool is designed in particular according to the type of SDS-Plus interface. 12 . 12 . The hand-held power tool according to claim 11 , wherein the striking mechanism ( 122 ) has a striking bolt ( 126 ), which is designed to impact the insertion tool ( 400 ). 13 . , 430, 434, 438). 13 . The hand-held power tool according to claim 12 , wherein the tool attachment interface ( 140 , 300 ) has length-critical structural elements, in particular the holding section ( 144 , 302 ) and the impact. 14 . At least substantially radial arrangement of the sealing ring (194) of the peg (126). 14. A tool attachment (202) having a tool receptacle (204) for rotationally fixed reception of an insertion tool (400, 430, 434, 438) for securing the tool attachment (202) on Fastening interface ( 200 ) on tool attachment interface ( 140 , 302 ) of hand-held power tool ( 100 ) and shaft for tool receptacle ( 204 ) during impact operation associated with the hand-held power tool Impact mechanism (122) which drives the insertion tool (400, 430, 434, 438) impact-like in the direction, characterized in that the tool attachment (202) has an at least approximately hollow-cylindrical support body (206) ), the tool receiver (204) is configured on a first end (208) of the support and on a second end of the support, oriented away from the first end (208) The fastening interface ( 200 ) is formed on ( 210 ) with an at least substantially hollow-cylindrical receiving section ( 212 ) from which a larger-diameter inner guide section ( 216 ) extends The free end ( 214 ) of ( 212 ) initially engages on an inner centering section ( 218 ) which is located further in the axial direction and has a smaller diameter.