Hand-held power tool with dust and / or drilling particle discharge

Abstract

In a hand-held power tool, in particular a drill, comprising a housing (110) and at least one drive motor arranged in the housing (110) for driving an output shaft (140), which has a tool holder (142) for an insert tool, wherein the output shaft (140) has a tubular transport section (144) for transporting away dust and / or drilling particles occurring during machining, and wherein, in its end region (299) close to the drive motor (120), the tubular transport section (144) is formed for discharging dust and / or drilling particles away from the output shaft (140). The output shaft (140) has, in the end region (299) of the tubular transport section (144) in a circumferential direction (202), a first plurality of recesses (213) and a second plurality of recesses (214) for discharging the dust and / or drilling particles away from the tubular transport section (144), and the first and second plurality of recesses (213, 214) are spaced apart from one another in the longitudinal direction (201) of the output shaft (140).

Description

[0001] Description

[0002] title

[0003] hand-held power tool with dust and / or drilling particle extraction

[0004] State of the art

[0005] The present invention relates to a hand-held power tool, in particular a drill, with a housing and at least one drive motor arranged in the housing for driving an output shaft which has a tool holder for an insert tool, wherein the output shaft has a tubular transport section for removing dust and / or drill particles generated during machining, and wherein the tubular transport section is designed at its end region facing the drive motor for diverting the dust and / or drill particles from the output shaft.

[0006] A hand-held power tool designed as a drilling machine is known from the prior art. It comprises a housing and at least one drive motor arranged within the housing for driving an output shaft. The output shaft has a tool holder for an insert tool. Furthermore, the output shaft has a tubular transport section for removing dust and / or drilling particles generated during machining. The tubular transport section is designed at its end facing the drive motor to guide the dust and / or drilling particles out of the output shaft. For this purpose, the tubular transport section has a recess.

[0007] Disclosure of the invention

[0008] The invention relates to a hand-held power tool, in particular a drill, with a housing and at least one drive motor arranged in the housing for driving an output shaft, which has a tool holder for an insert tool, wherein the output shaft has a tubular transport section for transporting dust and / or drill particles generated during machining, and wherein the tubular transport section is designed at its end region facing the drive motor for diverting the dust and / or drill particles from the output shaft. The output shaft has, in the end region of the tubular transport section, a first plurality of recesses and a second plurality of recesses in the circumferential direction for diverting the dust and / or drill particles from the tubular transport section, wherein the first and second plurality of recesses are spaced apart from each other in the longitudinal direction of the output shaft.

[0009] The invention thus enables the provision of a hand-held power tool in which improved extraction of dust and / or drilling particles can be easily and simply achieved through the first and second plurality of recesses that are spaced apart from each other in the longitudinal direction of the output shaft.

[0010] Preferably, the second plurality of recesses is arranged offset in the circumferential direction of the output shaft to the first plurality of recesses, such that in the circumferential direction a recess of the second plurality of recesses is arranged between two circumferentially adjacent recesses of the first plurality of recesses.

[0011] This makes it easy and reliable to achieve an increased volume flow rate during extraction.

[0012] Preferably, the recesses of the first and / or second plurality of recesses are at least substantially identical in design.

[0013] This allows for a suitable design of the recesses in a simple manner.

[0014] Preferably, at least one of the first and / or second plurality of recesses is circular. This allows for a simple and straightforward design of at least one recess.

[0015] According to one embodiment, at least one recess of the first and / or second plurality of recesses is designed as an elongated hole.

[0016] Thus, an alternative design for increasing the volume flow rate in an extraction system can be provided in a simple way.

[0017] Preferably, the elongated hole extends in the circumferential direction of the output shaft.

[0018] This allows for a simple and straightforward alignment of the elongated hole.

[0019] According to another embodiment, the elongated hole extends along the longitudinal direction of the output shaft.

[0020] This allows for a simple alternative orientation of the elongated hole.

[0021] According to another embodiment, the elongated hole extends at a predetermined angle to a transverse direction of the output shaft that is perpendicular to the longitudinal direction.

[0022] This allows for the simple and easy provision of another alternative orientation of the elongated hole.

[0023] Preferably, an adapter is provided for connecting to a suction hose of a suction device.

[0024] This allows for a simple connection to an external extraction device.

[0025] Furthermore, the present invention relates to a hand-held power tool, in particular a drilling machine, with a housing and at least one drive motor arranged in the housing for driving an output shaft which has a tool holder for an insert tool, wherein the output shaft has a tubular transport section for removing dust and / or drilling particles generated during machining, and wherein the tubular transport section is designed at its end region facing the drive motor for diverting the dust and / or drilling particles from the output shaft.The output shaft has a plurality of recesses in the circumferential direction in the end region of the tubular transport section for diverting the dust and / or drilling particles from the tubular transport section, wherein at least one recess of the plurality of recesses is designed as an elongated hole, and wherein the elongated hole extends at a predetermined angle to a transverse direction perpendicular to a longitudinal direction of the output shaft.

[0026] The invention thus enables the provision of a hand-held power tool in which, through the elongated slot design of at least one of the majority of recesses, improved extraction of dust and / or drilling particles, as well as consistent mechanical stability, can be achieved simply and easily.

[0027] Brief description of the drawings

[0028] The invention is explained in more detail below with reference to exemplary embodiments illustrated in the drawings. The drawings show:

[0029] Fig. 1 shows a perspective view of a hand-held power tool designed as a drill with a dust extraction device.

[0030] Fig. 2 shows a longitudinal section through an output shaft arranged in a housing of the hand-held power tool of Fig. 1 with a tubular transport section according to the invention,

[0031] Fig. 3 shows a side view of the tubular transport section of Fig. 2 in a first rotation position,

[0032] Fig. 4 shows a side view of the tubular transport section of Figs. 2 and 3 in a further rotational position, Fig. 5 shows a side view of the tubular transport section of Figs. 2 to 4 according to an alternative embodiment in a first rotational position,

[0033] Fig. 6 shows a side view of the tubular transport section of Fig. 5 in a further rotational position, and

[0034] Fig. 7 shows a side view of the tubular transport section from Fig. 2 to Fig. 6 according to an alternative embodiment.

[0035] Description of the exemplary implementations

[0036] In the figures, elements with the same or comparable function are given identical reference symbols and described in detail only once.

[0037] Fig. 1 shows an exemplary hand-held power tool 100 designed as a drilling machine with a housing 110 in which a drive motor 120 is arranged. Preferably, the hand-held power tool 100 is designed as a diamond drilling machine.

[0038] The housing 110 is shown with a handle 115, on which a control element 117 for activating and deactivating the drive motor 120 is arranged. The hand-held power tool 100 is shown with a power cable 190 for mains power supply. Alternatively, the hand-held power tool 100 can also be designed to operate independently of the mains supply using a battery pack. An optional auxiliary handle 119 is shown on the hand-held power tool 100 as an example.

[0039] The drive motor 120 is designed to drive an output shaft 140. Furthermore, the drive motor 120 is preferably associated with a gearbox 130, wherein the drive motor 120 is also designed to drive the gearbox 130.

[0040] The output shaft 140 has a tool holder 142 for an insert tool. Furthermore, the output shaft 140 has a tubular transport section 144 for removing dust and / or drilling particles generated during machining. For extraction, the hand-held power tool 100 is shown to have an extraction area 150. Preferably, an adapter 152 for connecting to an extraction hose 154 of an external (not shown) extraction device is associated with the extraction area 150. During operation of the hand-held power tool 100, dust and / or drilling particles generated are transported via the tubular transport section 144 into the extraction area 150 and from there extracted by the external extraction device via the adapter 152 and the extraction hose 154.

[0041] Fig. 2 shows the output shaft 140, which is rotatably mounted in the housing 110 of the hand-held power tool 100 of Fig. 1, with the tubular transport section 144. The tubular transport section 144 is designed at its end region 299, which faces the drive motor 120 of Fig. 1, to discharge the dust and / or drilling particles from the output shaft 140.

[0042] According to the invention, the output shaft 140 has, in the end region 299 of the tubular transport section 144, a first plurality of recesses 213 and a second plurality of recesses 214 in the circumferential direction 202 for diverting the dust and / or drilling particles from the tubular transport section 144. The first and second plurality of recesses 213, 214 are arranged in the extraction area 150, so that the resulting dust and / or drilling particles can be extracted via the adapter 152.

[0043] Preferably, the first and second plurality of recesses 213, 214 are spaced apart from each other in the longitudinal direction 201 of the output shaft 140. A longitudinal axis 203 of the output shaft 140 forms the longitudinal direction 201 for illustrative purposes.

[0044] Preferably, the second plurality of recesses 214 is offset in the circumferential direction 202 of the output shaft 140 to the first plurality of recesses.

[0045] 213. In this case, a recess 212 (312 in Fig. 3; 422 in Fig. 4) of the second plurality of recesses is arranged in the circumferential direction 202.

[0046] 214 between two recesses 211 adjacent in the circumferential direction 202 (311 in Fig. 3; 511 in Fig. 5) of the first plurality of recesses 213.

[0047] According to one embodiment, the recesses 211, 212 (311, 312 in Fig. 3; 422 in Fig. 4; 511 in Fig. 5) of the first and / or second plurality of recesses 213, 214 are at least substantially identical. Preferably, at least one recess 211, 212 (311, 312 in Fig. 2; 422 in Fig. 4; 511 in Fig. 5) of the first and / or second plurality of recesses 213, 214 is circular. For illustrative purposes, both recesses 211, 212 are circular in Fig. 2.

[0048] Fig. 3 shows the output shaft 140 from Fig. 1 and Fig. 2 with the tubular transport section 144, which has the first and second plurality of recesses 213, 214. Fig. 3 illustrates a rotational position 310 in which the respective suction cross-section of the recesses of the plurality of recesses 213, 214 is minimal. For illustrative purposes, two recesses 211, 311 of the first plurality of recesses 213 and two recesses 212, 312 of the second plurality of recesses 214 are shown. In this arrangement, the recess 311 forms an extraction cross-section 322, the recess 212 an extraction cross-section 321, and the recess 312 an extraction cross-section 323. The extraction cross-sections 321, 322, 323 form a first overall extraction cross-section.

[0049] Furthermore, a web 341, 342, 351, 352 is formed between each of the first and second plurality of recesses 213, 214 arranged circumferentially 202. For illustrative purposes, a web 341 is arranged circumferentially 202 between the recesses 211, 311, and a web 342 is arranged below the recess 311. Furthermore, a web 351 is arranged above the recess 212, and a web 352 is arranged circumferentially 202 between the recesses 212, 312. Additionally, the recess 212 of the second plurality of recesses 214 is arranged along the longitudinal direction 201 next to the web 341. The webs 341, 342, 351, 352 enable the end region 299 of the tubular transport section 144 of Fig. 2, which faces the drive motor 120, to be designed in a stable and robust manner.

[0050] Fig. 4 shows the output shaft 140 from Figs. 1 to 3 with the tubular transport section 144, which has the first and second plurality of recesses 213, 214. Fig. 4 illustrates a rotational position 410 in which the respective suction cross-section of the recesses of the plurality of recesses 213, 214 is at its maximum. For illustrative purposes, two recesses 211, 311 of the first plurality of recesses 213 and three recesses 212, 312, 422 of the second plurality of recesses 214 are shown. In this arrangement, recess 211 forms an extraction cross-section 421, recess 311 forms an extraction cross-section 322, and recess 212 forms an extraction cross-section 321. The extraction cross-sections 321, 322, and 421 together form a second overall extraction cross-section. This second overall extraction cross-section is larger than the first overall extraction cross-section shown in Fig. 3.

[0051] Fig. 5 shows the output shaft 140 from Figs. 1 to 4 with the tubular transport section 144, which has the first and second plurality of recesses 213, 214. According to one embodiment, at least one recess 211, 212, 311, 312, 422, 511 of the first and / or second plurality of recesses 213, 214 is designed as an elongated hole 510. The elongated hole 510 preferably extends in the circumferential direction 202 of the output shaft 140. For illustrative purposes, all recesses 212, 311, 312, 511 of the first and second plurality of recesses 213, 214 shown in Fig. 5 are designed as elongated holes.

[0052] Fig. 5 illustrates the rotation position 310 shown in Fig. 3, in which the respective extraction cross-section of the recesses of the plurality of recesses 213, 214 is minimal. For illustrative purposes, two recesses 311, 511 of the first plurality of recesses 213 and two recesses 212, 312 of the second plurality of recesses 214 are shown. Recess 311 forms extraction cross-section 322 and recess 312 forms extraction cross-section 323. Extraction cross-sections 322, 323 together form a first overall extraction cross-section.

[0053] Fig. 6 shows the output shaft 140 from Fig. 5 with the tubular transport section 144, which has the first and second plurality of recesses 213, 214. Fig. 6 illustrates the rotational position 410 from Fig. 4, in which the respective suction cross-section of the recesses of the plurality of recesses 213, 214 is at its maximum. For illustrative purposes, three recesses 211, 311, 511 of the first plurality of recesses 213 and two recesses 212, 312 of the second plurality of recesses 214 are shown. In this arrangement, recess 311 forms the extraction cross-section 322, recess 212 forms the extraction cross-section 321, and recess 312 forms the extraction cross-section 323. The extraction cross-sections 321, 322, and 323 in turn form a second overall extraction cross-section. This second overall extraction cross-section is larger than the first overall extraction cross-section shown in Fig. 5.

[0054] Fig. 7 shows the output shaft 140 from Figs. 1 to 6 with the tubular transport section 144, which, according to a further embodiment, has a plurality of recesses 214 for diverting the dust and / or drilling particles from the tubular transport section 144. Preferably, at least one recess 510 of the plurality of recesses 214 is designed as an elongated slot 510. The elongated slot 510 extends at a predetermined angle 720 to a transverse direction 702 perpendicular to a longitudinal direction 201 of the output shaft 140. This allows for a larger, constant extraction cross-section, which can convey a high volume flow. At the same time, the mechanical stability remains constant despite the large extraction cross-section.

[0055] For illustrative purposes, the recesses 212 and 312 are shown in the majority of the recesses 214. Recess 212 is associated with the extraction cross-section 321, and recess 312 is associated with the extraction cross-section 323. However, recesses 212 and 312 are exemplary and, unlike the embodiments described in Figures 3 to 6, are not spaced apart from each other in the longitudinal direction 201 of the output shaft 140.

[0056] It should be noted that the recesses of the first and / or second plurality of recesses 213, 214 may also have any other shape. Furthermore, the recesses of the first plurality of recesses 213 may differ from the recesses of the second plurality of recesses 214 in shape and / or orientation. Alternatively, at least one recess of the plurality of recesses 213, 214, configured as an elongated hole 510, may extend along the longitudinal direction 201 of the output shaft 140.

Claims

Claims 1. Hand-held power tool (100), in particular a drilling machine, with a housing (110) and at least one drive motor (120) arranged in the housing (110) for driving an output shaft (140) which has a tool holder (142) for an insert tool, wherein the output shaft (140) has a tubular transport section (144) for transporting dust and / or drilling particles generated during machining, and wherein the tubular transport section (144) is designed at its end region (299) facing the drive motor (120) for diverting the dust and / or drilling particles from the output shaft (140), characterized in that the output shaft (140) has in the end region (299) of the tubular transport section (144) a first plurality of recesses (213) and a second plurality of recesses (214) in the circumferential direction (202) for diverting the dust and / or contains drill particles from the tubular transport section (144),wherein the first and second plurality of recesses (213, 214) are spaced apart from each other in the longitudinal direction (201) of the output shaft (140).

2. Hand-held power tool according to claim 1, characterized in that the second plurality of recesses (214) is arranged offset in the circumferential direction (202) of the output shaft (140) to the first plurality of recesses (213), such that in the circumferential direction (202) a recess (212; 312; 422) of the second plurality of recesses (214) is arranged between two recesses (211; 311; 511) of the first plurality of recesses (213) adjacent in the circumferential direction (202).

3. Hand-held power tool according to claim 1 or 2, characterized in that the recesses (211, 212; 311, 312; 422; 511) of the first and / or second plurality of recesses (213, 214) are at least substantially are identically trained.

4. Hand-held power tool according to one of the preceding claims, characterized in that at least one recess (211 , 212; 311 , 312; 422; 511) of the first and / or second plurality of recesses (213, 214) is circular.

5. Hand-held power tool according to one of claims 1 to 3, characterized in that at least one recess (211 , 212; 311 , 312; 422; 511) of the first and / or second plurality of recesses (213, 214) is designed as an elongated hole (510).

6. Hand-held power tool according to claim 5, characterized in that the elongated hole (510) extends in the circumferential direction (202) of the output shaft (140).

7. Hand-held power tool according to claim 5, characterized in that the elongated hole (510) extends along the longitudinal direction (201) of the output shaft (140).

8. Hand-held power tool according to claim 5, characterized in that the elongated hole (510) extends at a predetermined angle (720) to a transverse direction (702) of the output shaft (140) formed perpendicular to the longitudinal direction (201).

9. Hand-held power tool according to one of the preceding claims, characterized in that an adapter (152) is provided for connecting to a suction hose (154) of a suction device.

10. Hand-held power tool (100), in particular a drilling machine, with a housing (110) and at least one drive motor (120) arranged in the housing (110) for driving an output shaft (140) which has a tool holder (142) for an insert tool, wherein the output shaft (140) has a tubular transport section (144) for removing dust and / or drilling particles generated during machining, and wherein the tubular transport section (144) is attached at its The end region (299) facing the drive motor (120) is designed for the discharge of dust and / or drill particles from the output shaft (140), characterized in that the output shaft (140) in the end region (299) of the tubular transport section (144) has a plurality of recesses (214) in the circumferential direction (202) for the discharge of dust and / or drill particles from the tubular transport section (144), wherein at least one recess (510) of the plurality of recesses (214) is designed as an elongated hole (510), and wherein the elongated hole (510) extends at a predetermined angle (720) to a transverse direction (702) formed perpendicular to a longitudinal direction (201) of the output shaft (140).

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