Electric handheld power tool with ball latch clutch

Abstract

An electric handheld power tool, in particular a hammer drill and / or a rotary hammer, comprises: a function setting tube that can be actuated via a manual function selector switch to achieve a plurality of different operating modes, a guide tube equipped with a tool assembly, and a ball-type latch clutch for transmitting rotational movement from the function setting tube to the guide tube, wherein the ball-type latch clutch has a radial hole formed in the function setting tube, a main latch recess formed in the guide tube, a coupling ball installed in the radial hole and intended to engage in the main latch recess, and a spring-loaded conical ring, wherein the coupling ball can be deflected in a radial direction to overcome the actuation force of the spring-loaded conical ring, wherein the guide tube has an auxiliary recess formed therein, which is different from the main latch recess and whose opening angle is greater than the opening angle of the main latch recess.

Description

Technical Field

[0001] The present invention relates to an electric hand-held power tool, in particular a hammer drill and / or a rotary hammer. The hand-held power tool is equipped with a function setting tube, which can be actuated via a manual function selector switch. A variety of different operating modes can be set thereby, such as chisel positioning, cutting, hammer drilling and non-impact drilling. The hand-held power tool has a guide tube equipped with a tool assembly and a ball-type latch clutch for transmitting rotational movement from the function setting tube to the guide tube. The ball-type latch clutch has a radial hole formed in the function setting tube, a main latch recess preferably in a groove shape formed in the guide tube, a coupling ball installed in the radial hole and intended to engage in the main latch recess, and a spring-loaded cone ring. The coupling ball can deflect in a radial direction relative to the guide tube against the actuation force of the spring-loaded cone ring. If the tool received in the tool assembly gets stuck, the guide tube stops working. On the other hand, the function setting tube continues to be driven, for example in the hammer drill operating mode. If the torque applied by the guide tube overcomes the actuation force of the spring-loaded cone ring, the coupling ball comes out of the main latch recess and moves in the circumferential direction along the guide tube. In this way, damage to one or more transmission components of the handheld power tool can be prevented. If the torque applied by the guide tube is lower than the actuation force of the spring-loaded cone ring, the coupling ball is pressed back into the main latch recess by the cone ring. Background Art

[0002] Hand-held power tools of the type mentioned in the introduction are known in principle from the prior art. Summary of the invention

[0003] It is an object of the present invention to provide a hand-held power tool which can be operated in a particularly reliable manner.

[0004] This object is achieved in that the guide tube has an auxiliary recess formed therein which is different from the main latch recess and whose opening angle is greater than the opening angle of the main latch recess. The corresponding opening angle is preferably located in a radial cross-sectional plane of the guide tube. The radial cross-sectional plane of the guide tube is preferably a cross-sectional plane whose surface normal extends parallel to, preferably coaxially to, the working axis (longitudinal axis) of the guide tube. It has been found to be advantageous if the opening angle of the main latch recess is between 70 and 80 degrees, preferably 75 degrees. In a particularly preferred embodiment, the opening angle of the auxiliary recess is greater than 90 degrees, preferably greater than 120 degrees.

[0005] The invention includes the discovery that there are situations in which a coupling ball that has been moved out of the main latch recess (i.e. after the ball latch clutch has been safely stopped) does not return to its intended position in the main latch recess, but comes to rest on the non-recessed surface of the guide tube. In this case, the radial forces between the guide tube and the coupling ball are such that the function setting tube can no longer be axially adjusted to achieve a variety of different operating modes of the handheld power tool. By means of the auxiliary recess with a larger opening angle provided according to the invention, a defined position of the coupling ball is provided on the surface of the guide tube, so that the function setting tube can be moved in the axial direction at any time.

[0006] It has been found to be advantageous if the auxiliary recess is longer in the axial direction than the main latching recess. In a particularly preferred embodiment, the main latching recess and the auxiliary recess are spaced apart from one another in the circumferential direction relative to the guide tube by a web. It has been found to be advantageous if the web width of the web in the circumferential direction is less than 1 mm. The web width may be less than 0.5 mm. In a particularly preferred embodiment, the web width is 0.4 mm.

[0007] It has been found to be advantageous if the opening width of the auxiliary recess relative to the circumferential circle of the guide tube is greater than the opening width of the primary latch recess relative to the circumferential circle. It is understood that the circumferential circle of the guide tube is preferably a circle extending along the outer surface of the guide tube and tangent to all the connecting plates of the guide tube. Here, the opening width of the primary latch recess is preferably the arc length of the part of the circumferential circle spanning the primary latch recess. Here, the opening width of the auxiliary recess is preferably the arc length of the part of the circumferential circle spanning the auxiliary recess.

[0008] In a particularly preferred embodiment, the main latch recess and / or the auxiliary recess is groove-shaped, preferably with a longer extent in the axial direction of the guide tube. The main latch recess, in particular the main latch recess in the shape of a groove, can have a variable radius of curvature in the radial cross-sectional plane and / or side portions that are rectilinear in some parts. If this is the case, the opening angle of the main latch recess is preferably predefined by the side portion of the main latch recess that has the longest extent in the radial direction. Alternatively, if the main latch recess, in particular the main latch recess in the shape of a groove, has a constant radius of curvature in the radial cross-sectional plane, the opening angle of the main latch recess is preferably spanned by those secants that are tangent to the connecting plate in the respective case on the one hand and intersect at the base point of the main latch recess on the other hand.

[0009] The auxiliary recess, in particular the auxiliary recess in the shape of a groove, can have a constant radius of curvature in the radial cross-sectional plane. In this case, the opening angle of the main latch recess is preferably spanned by those secants that are tangent to the connecting plate in the respective case on the one hand and intersect at the base point of the main latch recess on the other hand. Alternatively, the auxiliary recess, in particular the auxiliary recess in the shape of a groove, can have a variable radius of curvature in the radial cross-sectional plane and / or a side that is rectilinear in some parts. In this case, the opening angle of the auxiliary recess is preferably spanned by those secants that are tangent to the connecting plate in the respective case on the one hand and intersect at the base point of the auxiliary recess on the other hand. In a particularly preferred embodiment, a plurality of main latch recesses and a plurality of auxiliary recesses are provided in the guide tube. It has been found that it is advantageous if the main latch recesses and the auxiliary recesses alternate in the circumferential direction of the guide tube.

[0010] It has been found that it is advantageous if the conical ring has a first conical shoulder and a second conical shoulder different from the first conical shoulder. Particularly preferably, the first conical shoulder and the second conical shoulder have different inclination angles relative to the axial direction. It has been found that it is advantageous if the inclination angle of the first conical shoulder, in particular the conical shoulder extending further away from the guide tube in the radial direction, is between 50 and 60 degrees, preferably 55 degrees. The inclination angle of the second conical shoulder is preferably between 35 and 45 degrees, preferably 38 degrees. In a further preferred embodiment, the radial hole has a cylindrical channel and / or a conical bevel in the function setting tube. Particularly preferably, the conical bevel has a cone angle of between 15 and 25 degrees, preferably 20 degrees, wherein the cone angle is based on the radial direction.

[0011] In a particularly preferred embodiment, the electric hand-held power tool takes the form of a battery-powered combination hammer. The maximum operating torque that can be transmitted via the ball-type latch clutch (the coupling ball is paired with the main latch recess) is preferably between 30 and 40 Newton-meters. The axial force applied for the axial displacement of the function setting tube is preferably between 30 and 100 Newtons, especially between 35 and 45 Newtons. The torque required to overcome the auxiliary recess (the coupling ball is paired with the auxiliary recess) is preferably at most 50% of the maximum operating torque that can be transmitted via the ball-type latch clutch, and particularly preferably at most 20%.

[0012] The present invention is also realized by a guide tube for an electric hand-held power tool, in particular for a hammer drill and / or a rotary hammer, wherein the guide tube has a primary latching recess for at least partially engaging with a coupling ball and an inner volume for receiving an excitation piston of an impact mechanism. The guide tube has an auxiliary recess formed therein, which is different from the primary latching recess and has an opening angle greater than the opening angle of the primary latching recess. The guide tube according to the present invention can be configured in a corresponding manner by means of the exemplary embodiments described with reference to the electric hand-held power tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Further advantages will become apparent from the following description of the drawings. Various exemplary embodiments of the invention are shown in the drawings. The drawings, the description and the claims contain many combined features. It will also be convenient for a person skilled in the art to consider these features individually and combine them to give useful further combinations. In the drawings, identical and similar components are indicated by the same reference numerals. In the drawings:

[0014] Figure 1A A first exemplary embodiment of a handheld power tool according to the present invention is shown;

[0015] Figure 1B shows a cross-sectional view of a handheld power tool;

[0016] Figure 2A shows a side view of a guide tube according to a first preferred exemplary embodiment with section line AA indicated;

[0017] Figure 2B Shows Figure 2A Section view AA (sagittal section plane);

[0018] Figure 3A shows a side view of a guide tube according to a second preferred exemplary embodiment with section line AA indicated;

[0019] Figure 3B Shows Figure 3A Section view AA (sagittal section plane);

[0020] Figure 4A A preferred exemplary embodiment of a ball-type latch clutch is shown;

[0021] Figure 4B The radial holes in the function setting tube are shown;

[0022] Figure 4C A tapered ring having a first tapered shoulder and a second tapered shoulder is shown; and

[0023] Figure 5 The hand-held power tool of FIG. 1 is shown in different operating modes. DETAILED DESCRIPTION

[0024] Figure 1A A first preferred exemplary embodiment of an electric handheld power tool 100 according to the present invention is shown in FIG. The handheld power tool 100 is, for example, in the form of a combination hammer. The handheld power tool 100 is equipped with a manual function selector switch 10, via which a plurality of different operating modes of the handheld power tool 100 can be set. Thus, Figure 1BBy way of example, a cross section of the handheld power tool 100 is shown in a hammer drill operating mode BH, while Figure 5 By way of example a cross section of the hand held power tool 100 is shown in a cutting operating mode ME.

[0025] The electric hand-held power tool 100 is equipped with a cylindrical guide tube 30 having a tool assembly 35. A chisel 36 is received in the tool assembly 35. Figure 1B Only a part of the chisel is shown in FIG. 1 . The handheld power tool 100 has a function setting tube 20 which can be moved in an axial direction AR to achieve a plurality of different operation modes via the manual function selector switch 10 . The cylindrical function setting tube 20 is coaxially arranged with a guide tube 30 .

[0026] The hand-held power tool 100 is also equipped with a pneumatic impact mechanism 50 having an excitation piston 51, which is movable in the axial direction AR along the working axis AX in the guide tube 30. The excitation piston 51 is connected to an impact mechanism eccentric 55 via a connecting rod 53, which is driven by an electric motor, which is not shown here. By means of the excitation piston 51, a periodic impact mechanism pressure can be generated in the guide tube 30, because Figure 1B In the hammer drill operation mode BH shown, the ventilation opening 31 of the guide pipe 30 is closed by the function setting pipe 20 .

[0027] Both the function setting tube 20 and the guide tube 30 are mounted in the housing 90 of the handheld power tool 100 so as to be rotatable about the working axis AX. In order to rotate the function setting tube 20 about the working axis AX, the handheld power tool 100 has a bevel gear 23 which can be driven by an electric motor, which is not shown here. The bevel gear 23 in turn drives a conical ring 25, with which the function setting tube 20 is engaged in a form-fitting manner in the circumferential direction UR, at least in the hammer drill operating mode BH shown in FIG. 1 .

[0028] The hand-held power tool 100 further has a ball-type latch clutch 40 for transmitting the rotational movement from the function setting tube 20 to the guide tube 30. To this end, the ball-type latch clutch 40 is equipped with a radial hole 42 formed in the function setting tube 20. The ball-type latch clutch 40 also has a coupling ball 45 installed in the radial hole 42. The coupling ball 45 is intended to engage in a primary latch recess 43 formed in the guide tube 30. If the coupling ball 45 engages with the primary latch recess 43, the rotational movement can be transmitted from the function setting tube 20 to the guide tube 30. In the exemplary embodiment currently shown, the guide tube 30 has a plurality of primary latch recesses 43 formed on the guide tube 30 in the circumferential direction UR. Accordingly, a plurality of coupling balls 45 and a plurality of radial holes 42 are also provided. The ball-type latch clutch 40 has a cone ring 47, which is spring-loaded by a spring 48, and the coupling ball 45 can be deflected outward in the radial direction RR against the actuation force AF of the cone ring.

[0029] Fig. 2 shows a first preferred exemplary embodiment of a guide tube 30. The guide tube 30 is used in an electric handheld power tool 100 (see Fig. 1). Figure 2A Here a side view of the guide tube 30 is shown with the section line AA indicated. Figure 2B AA (radial cross-sectional plane) is shown in . The guide tube 30 has six primary latch recesses 43 arranged in the circumferential direction UR on the guide tube 30 . Six auxiliary recesses 44 are formed in the guide tube 30 in an alternating manner with the primary latch recesses 43 .

[0030] from Figure 2B As can be seen from the figure, the groove-shaped main latch recess 43 does not have a constant radius of curvature in the radial cross-sectional plane AA. The opening angle W1 of the main latch recess 43 is predefined by the side portion 43' of the main latch recess 43 having the longest extent in the radial direction RR. The opening angle W1 of the main latch recess 43 is, for example, 75 degrees. Figure 2B It can also be seen that the groove-shaped auxiliary recess 44 has a constant radius of curvature KR. The opening angle W2 of the auxiliary recess 44 is spanned in the radial section plane AA by those secants SK which are tangent to the connecting plate 46 in each case on the one hand and intersect at the base point (“deepest” point) of the auxiliary recess 43 on the other hand. The opening angle W2 of the auxiliary recess 44 is formed, for example, to be 135 degrees. Therefore, the opening angle W2 of the auxiliary recess 44 is greater than the opening angle W1 of the main latch recess 43. Due to the relatively small opening angle W1 of the main latch recess 43, the main latch recess 43 is used to actually transfer the working torque from the functional setting tube 20 (see Figure 1B) is transferred to the guide tube 30. The auxiliary recess 44 is only used to provide a defined position for the coupling ball 45 along the circumferential direction UR of the guide tube 30, so that the function setting tube 20 can be displaced in the axial direction AR regardless of the rotational position of the guide tube 30.

[0031] It can also be seen from FIG. 2 that the auxiliary latch length LZ of the auxiliary recess 44 in the axial direction AR is greater than the main latch length LH of the main latch recess 43. In addition, the auxiliary recess 44 is spaced apart from the main latch recess 43 in the circumferential direction UR by the connecting plate 46. For example, the thickness of the connecting plate 46 in the circumferential direction UR is 0.4 mm. Obviously, due to the small connecting plate thickness of the connecting plate 46, the coupling ball 45 (not shown in FIG. 2) is located in the main latch recess 43 or in the auxiliary recess 44.

[0032] Figure 2B It is shown that the opening width OW2 of the auxiliary recess 44 relative to the circumferential circle UK of the guide tube 30 is greater than the opening width OW1 of the main latch recess 43 relative to the circumferential circle UK. The circumferential circle UK of the guide tube 30 is a circle tangent to all the connecting plates 46 of the guide tube. Here, the opening width OW1 of the main latch recess 43 corresponds to the arc length of the portion UK1 of the circumferential circle UK that spans the main latch recess 43. Here, the opening width OW of the auxiliary recess corresponds to the arc length of the portion UK2 of the circumferential circle UK that spans the auxiliary recess 44.

[0033] Fig. 3 shows a second preferred exemplary embodiment of a guide tube 30. The guide tube 30 is used in an electric handheld power tool 100 (see Fig. 1). Figure 3A Here a side view of the guide tube 30 is shown with the section line AA indicated. Figure 3B AA (radial cross-sectional plane) is shown in . The guide tube 30 has six primary latch recesses 43 arranged in the circumferential direction UR on the guide tube 30 . Six auxiliary recesses 44 are formed in the guide tube 30 in an alternating manner with the primary latch recesses 43 .

[0034] The main latch recess 43 of the exemplary embodiment of FIG. 3 is formed to be the same as the main latch recess 43 of the exemplary embodiment of FIG. 2 . Accordingly, the opening angle W1 of the main latch recess 43 is predefined by the side portion 43' of the main latch recess 43 having the longest range in the radial direction RR. Compared with the exemplary embodiment of FIG. 2 , the auxiliary recess 44 of the guide tube 30 of FIG. 3 is stepped, specifically, the auxiliary recess 44 has two side surfaces 44', at least some parts of which extend straight, so that the auxiliary recess does not have a constant radius of curvature. The opening angle W2 of the auxiliary recess 44 is spanned by the two side surfaces 44' extending straight at least in some parts. The opening angle W2 of the auxiliary recess 44 is formed to be 135 degrees, for example. Therefore, the opening angle W2 of the auxiliary recess 44 is greater than the opening angle W1 of the main latch recess 43.

[0035] Figure 4A 4 shows a preferred exemplary embodiment of a ball-type latching clutch 40. The ball-type latching clutch 40 is used to transmit a rotational movement from the function setting tube 20 to the guide tube 30. To this end, the ball-type latching clutch 40 is equipped with a radial hole 42 formed in the function setting tube 20. The ball-type latching clutch 40 also has a coupling ball 45 mounted in the radial hole 42. The coupling ball 45 is intended to engage in a main latching recess 43 formed in the guide tube 30. The ball-type latching clutch 40 has a cone ring 47, which is spring-loaded by a spring 48, and the coupling ball 45 can be deflected outwardly (upward in FIG. 4) in a radial direction RR against the actuation force AF of the cone ring.

[0036] from Figure 4B It can be seen that the radial passage 42 (see Figure 4A ) has a cylindrical channel 42' oriented coaxially with the radial direction RR. A tapered surface 42' is formed on the side of the radial channel 42' facing away from the guide tube 30, and the tapered surface has a tapered angle KW of 20 degrees relative to the radial direction RR, for example. This tapered surface 42' makes it easier for the coupling ball 45 to exit outward in the radial direction (see Figure 4A , upward movement of the coupling ball 45).

[0037] Figure 4CA preferred embodiment of a spring-loaded conical ring 47 is now shown. The conical ring 47 has a first conical shoulder 47a and a second conical shoulder 47b. The first conical shoulder 47a and the second conical shoulder 47b have different inclination angles N1, N2 relative to the axial direction AR. The first conical shoulder 47a, i.e., the conical shoulder extending farther from the guide tube 30 in the radial direction RR, has an inclination angle N1 of, for example, 55 degrees. The second conical shoulder 47b has, for example, an inclination angle N2 of 38 degrees. Since the spring-loaded conical ring 47 is formed with the first conical shoulder 47a and the second conical shoulder 47b, the axial actuation force required for the movement of the function setting tube 20 can be significantly reduced in combination with the conical ramp 42". At the same time, it has been shown that the release torque achieved by the ball-type latch clutch 45 is only minimally reduced.

[0038] at last, Figure 5 The handheld power tool 100 of FIG. 1 is shown in a cutting mode of operation ME. Figure 5 The hand-held power tool 100 is also equipped with a pneumatic impact mechanism 50 having an excitation piston 51, which is movable in the axial direction AR along the working axis AX in the guide tube 30. The excitation piston 51 is connected to an impact mechanism eccentric 55 via a connecting rod 53, and the impact mechanism eccentric 55 is driven by an electric motor, which is not shown here. By means of the excitation piston 51, a periodic impact mechanism pressure can be generated in the guide tube 30, because Figure 1B In the illustrated cutting operation mode ME, the ventilation opening 31 of the guide pipe 30 is closed by the function setting pipe 20 .

[0039] Both the function setting tube 20 and the guide tube 30 are mounted in the housing 90 of the handheld power tool 100 so as to be rotatable about the working axis AX. In the cutting operation mode ME, the guide tube 30 does not need to be rotated. Therefore, in the cutting operation mode ME, the function setting tube 20 is not driven to rotate about the working axis AX. Although the bevel gear 23 continues to drive the guide tube 30 from the cutting operation mode ME, the guide tube 30 is not driven to rotate about the working axis AX. Figure 1B The cone ring 25 is known in the art, but the cone ring does not form a mating engagement with the function setting tube 20 relative to the circumferential direction UR. This is because the function selector switch 10 (see Figure 1A ) function sets the direction of the tube 20 in the tool assembly 35 ( Figure 5 The left side in the figure is shifted upward, and the straight teeth 27 of the function setting tube 27 are spaced apart from the conical ring 25.

[0040] Reference numerals list

[0041] 10-function selector switch

[0042] 20 function setting tube

[0043] 23 Bevel gear

[0044] 25 cone ring

[0045] 27 straight teeth

[0046] 30 guide tube

[0047] 31 Vents

[0048] 35 tool assembly parts

[0049] 36 Chisel

[0050] 40 ball latch clutch

[0051] 42 radial holes

[0052] 42' cylindrical channel

[0053] 42'' cone bevel

[0054] 43 Main latch recess

[0055] 43' side section

[0056] 44 auxiliary recess

[0057] 44' side

[0058] 45 connection ball

[0059] 46 connection plate

[0060] 47 cone ring

[0061] 47a First taper shoulder

[0062] 47b Second taper shoulder

[0063] 48 Compression spring

[0064] 50 Impact mechanism

[0065] 51 Incentive Piston

[0066] 53 Connecting rod

[0067] 55 Impact mechanism eccentric wheel

[0068] 90 Shell

[0069] 100 Electric Handheld Power Tools

[0070] AF Actuation Force

[0071] AR Axial Direction

[0072] AX working axis

[0073] BH hammer drill operation mode

[0074] FP basis points

[0075] KW cone angle

[0076] KR radius of curvature

[0077] LH main latch length

[0078] LZ auxiliary latch length

[0079] ME cutting operation mode

[0080] N1 first cone shoulder inclination angle

[0081] N2 second cone shoulder inclination angle

[0082] OW1 Main Latch Recess Open Width

[0083] OW2 auxiliary recess opening width

[0084] RR radial direction

[0085] SK Secant

[0086] UK Circumferential Circle

[0087] UK1 portion of the circumferential circle on the main latch recess

[0088] UK2 The part of the circumferential circle on the auxiliary recess

[0089] UR circumferential direction

[0090] W1 Main latch recess opening angle

[0091] W2 auxiliary recess opening angle

Claims

1. An electric hand-held power tool (100) comprising: a function setting tube (20) which can be actuated via a manual function selector switch (10) to achieve a plurality of different operating modes (ME, BH); a guide tube (30) which is equipped with a tool assembly (35); and a ball-type latch clutch (40) for transmitting a rotational motion from the function setting tube (20) to the guide tube (30), wherein: The ball-type latch clutch (40) has a radial hole (42) formed in the function setting tube (20), a main latch recess (43) formed in the guide tube (30), a coupling ball (45) mounted in the radial hole (42) and intended to engage in the main latch recess (43), and a spring-loaded cone ring (47), the coupling ball (45) being deflectable in a radial direction (RR) against an actuation force (AF) of the spring-loaded cone ring, The invention is characterized in that the guide tube (30) has an auxiliary recess (44) formed therein, the auxiliary recess is different from the main latch recess (43) and its opening angle (W2) is greater than the opening angle (W1) of the main latch recess (43), and the auxiliary recess (44) is longer than the main latch recess (43) in the axial direction (AR).

2. The electric handheld power tool (100) according to claim 1, It is characterized in that The opening angle (W1) of the main latch recess (43) is between 70 and 80 degrees, and / or the opening angle (W2) of the auxiliary recess (44) is greater than 90 degrees.

3. The electric handheld power tool (100) according to claim 2, It is characterized in that The opening angle (W1) of the main latch recess (43) is 75 degrees, and / or the opening angle (W2) of the auxiliary recess (44) is greater than 120 degrees.

4. An electric hand-held power tool (100) according to any one of the preceding claims, It is characterized in that The shape of the primary latch recess (43) and / or the auxiliary recess (44) in the axial direction (AR) is a groove shape.

5. The electric handheld power tool (100) according to any one of claims 1 to 3, It is characterized in that The opening width (OW2) of the auxiliary recess (44) relative to the circumferential circle (UK) of the guide tube (30) is greater than the opening width (OW1) of the main latch recess (43) relative to the circumferential circle (UK).

6. The electric handheld power tool (100) according to any one of claims 1 to 3, It is characterized in that The primary latch recess (43) and the auxiliary recess (44) are spaced apart in the circumferential direction (UR) of the guide tube (30) by a connecting plate (46).

7. The electric handheld power tool (100) according to claim 6, It is characterized in that The connecting plate (46) has a connecting plate width of less than 1 mm.

8. The electric handheld power tool (100) according to any one of claims 1 to 3, It is characterized in that The tapered ring (47) has a first tapered shoulder (47a) and a second tapered shoulder (47b), wherein the first tapered shoulder and the second tapered shoulder have different inclination angles (N1, N2) relative to the axial direction (AR).

9. The electric handheld power tool (100) according to any one of claims 1 to 3, It is characterized in that The radial hole (42) has a cylindrical passage (42') with a tapered surface (42'').

10. The electric handheld power tool (100) according to claim 9, It is characterized in that The cone slope has a cone angle (KW) of 20 degrees.

11. The electric handheld power tool (100) according to any one of claims 1 to 3, It is characterized in that A plurality of primary latch recesses (43) and a plurality of auxiliary recesses (44) are provided, which are alternated along a circumferential direction (UR) of the guide tube (30).

12. The electric handheld power tool (100) according to any one of claims 1 to 3, It is characterized in that The electric handheld power tool (100) is a hammer drill and / or a rotary hammer.

13. A guide tube (30) for an electric handheld power tool (100), wherein: The guide tube has a primary latch recess (43) for at least partially engaging with a coupling ball (45) and an inner volume for receiving an actuating piston (51) of an impact mechanism (50). The invention is characterized in that the guide tube (30) has an auxiliary recess (44) formed therein, the auxiliary recess is different from the main latch recess (43) and its opening angle (W2) is greater than the opening angle (W1) of the main latch recess (43), and the auxiliary recess (44) is longer than the main latch recess (43) in the axial direction (AR).

14. The guide tube (30) according to claim 13, It is characterized in that The electric handheld power tool (100) is a hammer drill and / or a rotary hammer.

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