Hand tool with a dust sealing element

Abstract

In a hand-held power tool with a tool holder (145) for receiving an insert tool (190), wherein the tool holder (145) has at least one dust sealing element (170) which is arranged in an associated receptacle (224), the at least one dust sealing element (170) is designed to enclose an insert tool (190) which can be arranged in the tool holder (145) with prestress, wherein the at least one dust sealing element (170) is arranged in the associated receptacle (224, 226) so as to be movable in the radial direction (202) of the tool holder (145), and an inner diameter (243) of the associated receptacle (224) is greater than an outer diameter (242) of the at least one dust sealing element (170).

Description

State of the art

[0001] The present invention relates to a hand-held power tool with a tool holder for receiving an insert tool, wherein the tool holder has at least one dust sealing element which is arranged in an associated holder.

[0002] A handheld power tool with a tool holder for holding an insert tool is known from the prior art. Associated with the tool holder is a dust sealing element for sealing the tool holder against dust penetrating during operation. The dust sealing element is arranged in a receptacle provided for this purpose. Disclosure of the invention

[0003] The invention relates to a handheld power tool with a tool holder for receiving an insert tool, wherein the tool holder has at least one dust sealing element arranged in an associated receptacle. The at least one dust sealing element is designed to pre-tension an insert tool that can be arranged in the tool holder, wherein the at least one dust sealing element is arranged in the associated receptacle so as to be movable in the radial direction of the tool holder, and an inner diameter of the associated receptacle is larger than an outer diameter of the at least one dust sealing element.

[0004] The invention thus enables the provision of a hand-held power tool with a tool holder in which the movable arrangement of the at least one dust sealing element in an associated holder enables a safe and reliable dust seal for sealing the tool holder against dust penetrating during operation.

[0005] Preferably, the tool holder has a protective cap, wherein the associated holder is formed on an inner circumference of the protective cap.

[0006] This makes it easy and uncomplicated to arrange the recording appropriately.

[0007] Preferably, the protective cap comprises a first cap and a second cap arranged in the first cap, wherein the first cap comprises metal and the second cap comprises plastic.

[0008] This means that a simple and cost-effective protective cap can be provided.

[0009] According to one embodiment, the associated receptacle is formed on the second cap.

[0010] This makes it easy to arrange the recording in an alternative way.

[0011] According to a further embodiment, the at least one dust sealing element is connected to the second cap via a bellows.

[0012] Thus, a compact dust sealing element can be provided.

[0013] Alternatively, the associated holder is arranged at a free end of the tool holder.

[0014] This makes it easy to arrange the recording in an alternative way.

[0015] Preferably, the tool holder has an inner receptacle, wherein the associated receptacle is formed on an inner circumference of the inner receptacle.

[0016] This makes it easy and uncomplicated to arrange the recording in a different way.

[0017] Preferably, the at least one dust sealing element comprises rubber.

[0018] Thus, a safe and reliable dust sealing element can be provided.

[0019] According to one embodiment, the at least one dust sealing element has a holding portion and a sealing portion, wherein the holding portion comprises metal and the sealing portion comprises rubber.

[0020] This makes it easy to provide an alternative dust sealing element.

[0021] According to a further embodiment, at least one further dust sealing element is provided, wherein a separate receptacle is assigned to the at least one further dust sealing element, or wherein the at least one dust sealing element and the at least one further dust sealing element are arranged next to one another in the assigned receptacle.

[0022] This makes it easy to achieve improved dust sealing. Short description of the drawings

[0023] The invention is explained in more detail in the following description with reference to exemplary embodiments illustrated in the drawings. They show: Fig. 1 a schematic side view of a hand-held power tool with a tool holder to which a dust sealing element is assigned, Fig. 2 a longitudinal section through the tool holder of the hand-held power tool of FIG. 1, designed according to a first embodiment. Fig. 1, with two dust sealing elements arranged according to a first arrangement, Fig. 3 a longitudinal section through the tool holder of Fig. 2, in which an insert tool is arranged obliquely to the longitudinal axis, Fig. 4 a perspective view of the dust sealing element of Fig. 1 to Fig. 3 according to a first embodiment, Fig. 5 a longitudinal section through the tool holder of the hand-held power tool designed according to a second embodiment of Fig. 1, with two dust sealing elements analogous to the first arrangement of Fig. 2 and Fig. 3, Fig. 6 a perspective view of the dust sealing element of Fig. 5 according to the second embodiment, Fig. 7 a longitudinal section through the tool holder according to the first embodiment of Fig. 2 and Fig. 3 with a second arrangement of a dust sealing element according to a third embodiment, Fig. 8 a longitudinal section through the tool holder of Fig. 7 with two dust sealing elements, Fig. 9 a longitudinal section through the tool holder according to the first embodiment of Fig. 2 and Fig. 3 with two dust sealing elements according to the first embodiment in the second arrangement of Fig. 7 and Fig. 8, Fig. 10 a longitudinal section through the tool holder according to the second embodiment of Fig. 5 with the dust sealing element according to the third embodiment of Fig. 7 and Fig. 8 in the second arrangement of Fig. 7 to Fig. 9, Fig. 11 a longitudinal section through the tool holder of Fig. 10 with two dust sealing elements, Fig. 12 a longitudinal section through the tool holder according to the second embodiment of Fig. 5, Fig. 10 and Fig. 11 with two dust sealing elements according to the second embodiment of Fig. 5 and Fig. 6 in the second arrangement of Fig. 7 to Fig. 11, Fig. 13 a longitudinal section through the tool holder according to the first embodiment of Fig. 2 with the dust sealing element according to the first embodiment of Fig. 2 to Fig. 4, in a third arrangement, Fig. 14 a longitudinal section through the tool holder of Fig. 13 with two dust sealing elements, Fig. 15 a longitudinal section through the tool holder according to the second embodiment of Fig. 5, Fig. 10 to Fig. 12, with the dust sealing element according to the second embodiment of Fig. 5 and Fig. 6 in the third arrangement, Fig. 16 a longitudinal section through the tool holder of Fig. 15 with two dust sealing elements, Fig. 17 a longitudinal section through the tool holder of the hand-held power tool of FIG. 1, designed according to a third embodiment Fig. 1 with the dust sealing element according to the second embodiment of Fig. 5 and Fig. 6 in the third arrangement of Fig. 15 and Fig. 16, Fig. 18 a longitudinal section through the tool holder of Fig. 17 with two dust sealing elements, and Fig. 19 a longitudinal section through the tool holder according to the first embodiment of Fig. 2 and Fig. 3 with a dust sealing element according to a fourth embodiment. Description of the embodiments

[0024] In the figures, elements with the same or comparable function are provided with identical reference symbols and are described in detail only once.

[0025] Fig. 1 shows an exemplary handheld power tool 100 with a housing 110 in which a drive unit 120 is arranged for driving a tool holder 145 or an insert tool 190 arranged therein. The handheld power tool 100, in particular the tool holder 145, preferably has a protective cap 140. A grip sleeve 142 is preferably associated with the protective cap 140.

[0026] The tool holder 145 has at least one dust sealing element 170. The at least one dust sealing element 170 is designed to pre-stress the insert tool 190 that can be arranged in the tool holder 145. Preferably, the at least one dust sealing element 170 comprises rubber. Alternatively, the at least one dust sealing element 170 comprises a soft plastic, such as polyurethane.

[0027] Optionally, an output unit 130, in particular a gear, is assigned to the drive unit 120; however, the handheld power tool 100 can also be designed without the output unit 130. Furthermore, the handheld power tool 100 preferably has an impact mechanism 150 for generating an impact pulse. An impact pulse of the impact mechanism 150 can be generated in a manner already known to a person skilled in the art. In particular, a suitable impact mechanism with which the impact mechanism 150 can be implemented is sufficiently known to a person skilled in the art, so that a detailed description of the impact mechanism 150 is omitted here for the sake of simplicity and conciseness.

[0028] Illustratively, the housing 110 has a handle 105 on its side 104 facing away from the tool holder 140 and an optional additional handle 115 on its side 102 facing the tool holder 140. Illustratively, the handheld power tool 100 can be connected to a power grid via a power cable 199; however, the handheld power tool 100 can also be operated wirelessly, e.g., via a battery pack. Preferably, the handheld power tool 100 is designed in the manner of a drill or chisel hammer. Such a handheld power tool 100 as such is, in principle, sufficiently known from the prior art, which is why a detailed description is omitted here for the sake of brevity.

[0029] Fig. 2 shows an exemplary embodiment of the tool holder 145 of the hand-held power tool 100 of Fig. 1 with the protective cap 140 of Fig. 1. The tool holder 145 has an internal receptacle 212 in which Fig. 2 the insert tool 190 is arranged. Preferably, the tool holder 145 has a cylindrical inner receptacle 212 for receiving the insert tool 190, which is illustratively designed in the manner of a round shank insert tool, of Fig. 1, which here illustratively has a circular fastening cross-section. Preferably, the tool holder 145 is Fig. 2 designed as an SDS-Plus or SDS-Max tool holder.

[0030] The protective cap 140 is arranged at a free end 211 of the tool holder 145. The protective cap 140 has a holding portion 229, which is arranged in sections on an outer circumference 213 of the tool holder 145 and is designed to fasten the protective cap 140 to the tool holder 145. The holding portion 229 is arranged in the radial direction 202 of the tool holder 145 between the outer circumference 213 of the tool holder 145 and the grip sleeve 142 of the protective cap 140.

[0031] Preferably, the at least one dust sealing element 170 is arranged in an associated receptacle 224. Preferably, the at least one dust sealing element 170 is arranged in the associated receptacle 224 so as to be movable in the radial direction 202 of the tool holder 145. For this purpose, an inner diameter 243 of the associated receptacle 224 is larger than an outer diameter 242 of the at least one dust sealing element 170. Furthermore, an inner circumference 228 of the at least one dust sealing element 170 is arranged on an outer circumference 214 of the insert tool 190. Here, an inner diameter 241 is preferably assigned to an outer diameter 244 of the insert tool 190.

[0032] According to the Fig. 2, the associated receptacle 224 is formed on an inner circumference 222 of the protective cap 140. According to a further embodiment, the receptacle 224 associated with the at least one dust sealing element 170 is arranged on the free end 211 of the tool holder 145, as shown in Fig. 7 to Fig. 12 shown.

[0033] Illustratively, at least one further dust sealing element 280 is provided. According to one embodiment, a separate receptacle 226 is assigned to the at least one further dust sealing element 280. The two receptacles 224, 226 are arranged spaced apart from one another along a longitudinal extension 201 of the tool holder 145. Preferably, the illustratively two dust sealing elements 170, 280 are identically formed, at least within predetermined manufacturing tolerances. Alternatively, the illustratively two dust sealing elements 170, 280 can have different dimensions and / or different configurations or geometries.

[0034] Alternatively, the at least one dust sealing element 170 and the at least one further dust sealing element 280 are arranged next to one another in the associated receptacle 224.

[0035] In addition, the inner receptacle 212 of the tool holder 145 has a rotation axis 203 and the insert tool 190 has a rotation axis 204. In Fig. 2, the two rotation axes 203, 204 are arranged congruently.

[0036] Fig. 3 shows the tool holder 145 with the insert tool 190 of Fig. 2. In Fig. 3, the insert tool 190 is arranged obliquely in the internal receptacle 212, whereby the two rotation axes 203, 204 are no longer congruent. Such an oblique arrangement can arise during operation of the handheld power tool 100 due to comparatively high manufacturing tolerances and / or wear, in particular due to dust. According to the invention, at least one, illustratively the two dust sealing elements 170, 280, adapts to the oblique position of the insert tool 190 by moving in the radial direction 202 in the associated receptacles 224, 226. As a result, the ingress of dust into the tool holder 145 can preferably be at least largely prevented, so that wear can be reduced or prevented.

[0037] Fig. 4 shows the at least one dust sealing element 170, 280 of Fig. 2 and Fig. 3 with an annular round base body 410. The round base body 410 has the outer diameter 243 and the inner diameter 241 as well as an inner circumference 228 assigned to the insert tool 190 with a circular recess 420.

[0038] Fig. 5 shows the tool holder 145 of the hand tool 100 of Fig. 1, which according to one embodiment variant has a hexagonal inner receptacle 212 for receiving a hexagonal insert tool 590. Accordingly, the insert tool 590 has a hexagonal fastening cross-section. Analogous to the insert tool 590, the at least one, illustratively the two dust sealing elements 170, 280, has a hexagonal inner receptacle (610 in Fig. 6). Preferably, the tool holder 145 is in Fig. 5 in contrast to Fig. 2 and Fig. 3 designed as a HEX tool holder, preferably with a 22 mm internal receptacle.

[0039] According to one embodiment, the protective cap 140 is in Fig. 5 is formed in two parts and has a first cap 510 and a second cap 520 arranged in the first cap 510. Preferably, the first cap 510 is made of metal and the second cap 520 is made of plastic. Preferably, the associated receptacle 224 is formed on the second cap 520. Likewise, the associated receptacle 226 is formed on the second cap 520. Furthermore, the second cap 520 has a holding section 529 for fastening the protective cap 140 to the outer circumference 213 of the tool holder 145.

[0040] Analogous to the embodiment of Fig. 2 and Fig. 3, the at least one, illustratively two associated receptacles 224, 226 are formed on the inner circumference 522 of the second cap 520.

[0041] Fig. 6 shows the dust sealing element 170, 280 of Fig. 5. The dust sealing element 170, 280 has the annular round base body 410 and an inner circumference 228 with a hexagonal recess 610 assigned to the insert tool 590.

[0042] Fig. 7 shows the tool holder 145 with the insert tool 190 of Fig. 2 and Fig. 3, wherein the dust sealing element 170 is formed according to a further embodiment and arranged according to a second arrangement. Here, the associated receptacle 224 is arranged at the free end 211 of the tool holder 145. Illustratively, the receptacle 224 is formed between the free end 211 of the tool holder 145 and a side wall 711 of the protective cap 140.

[0043] In addition, Fig. 7, the dust sealing element 170 is formed in two parts. The dust sealing element 170 preferably has a holding section 732 and a sealing section 731. Preferably, the holding section 732 is made of plastic or metal, and the sealing section 731 is made of rubber. The sealing section 731 is preferably attached to the holding section 732, e.g., by vulcanization. Furthermore, the sealing section 731 has a circular inner circumference 228.

[0044] Fig. 8 shows the tool holder 145 with the insert tool 190 of Fig. 7, wherein the dust sealing element 170 and the further dust sealing element 280 are arranged in the receptacle 224 according to the second arrangement of Fig. 7. The two dust sealing elements 170, 280 are arranged next to one another in the longitudinal direction 201. Illustratively, the two dust sealing elements 170, 280 are each formed in two parts with the holding section 732 and the sealing section 731.

[0045] Fig. 9 shows the tool holder 145 with the insert tool 190 of Fig. 7 and Fig. 8, wherein in the receptacle 224 the dust sealing element 170 and the further dust sealing element 280 of Fig. 2 to Fig. 4 are arranged.

[0046] Fig. 10 shows the tool holder 145 with the insert tool 590 of Fig. 5, in which analogous to the embodiment of Fig. 7 to Fig. 9, the associated receptacle 224 is arranged at the free end 211 of the tool holder 145. Illustratively, the receptacle 224 is formed between the free end 211 of the tool holder 145 and a side wall 1011 of the second cap 520 of the protective cap 140.

[0047] In addition, Fig. 10, the dust sealing element 170 is formed in two parts. The dust sealing element 170 preferably comprises the holding section 732 and a sealing section 1031. Preferably, the holding section 732 comprises metal, and the sealing section 1031 comprises rubber. The sealing section 1031 is preferably attached to the holding section 732, e.g., by vulcanization. Furthermore, the sealing section 1031 illustratively has a hexagonal inner circumference 228 with a hexagonal recess 610.

[0048] Fig. 11 shows the tool holder 145 with the insert tool 590 of Fig. 10, wherein the dust sealing element 170 and the further dust sealing element 280 are arranged in the receptacle 224. The two dust sealing elements 170, 280 are arranged next to one another in the longitudinal direction 201. Illustratively, the two dust sealing elements 170, 280 are each formed in two parts with the holding section 732 and the sealing section 1031.

[0049] Fig. 12 shows the tool holder 145 with the insert tool 590 of Fig. 10 and Fig. 11, wherein in the receptacle 224 the dust sealing element 170 and the further dust sealing element 280 of Fig. 5 and Fig. 6 are arranged.

[0050] Fig. 13 shows the tool holder 145 with the insert tool 190 of Fig. 2, Fig. 3 and Fig. 7 to Fig. 9, with the dust sealing element 170 of Fig. 2 to Fig. 4, which is arranged according to a third arrangement. Here, the associated receptacle 224 is formed on an inner circumference 1312 of the inner receptacle 212.

[0051] Fig. 14 shows the tool holder 145 with the insert tool 190 and the third arrangement of the dust sealing element 170 according to Fig. 13. The dust sealing element 170 and the further dust sealing element 280 are arranged in the receptacle 224 arranged on the inner circumference 1312 of the inner receptacle 212. The two dust sealing elements 170, 280 are arranged next to one another in the longitudinal direction 201. Illustratively, the two dust sealing elements 170, 280 are shown in accordance with the embodiment of Fig. 2 to Fig. 4 trained.

[0052] Fig. 15 shows the tool holder 145 with the insert tool 590 of Fig. 5 and Fig. 10 to Fig. 12, with the dust sealing element 170 of Fig. 5, Fig. 6 and Fig. 12, which according to the third order of Fig. 13 and Fig. 14 is arranged on the inner circumference 1312 of the inner receptacle 212.

[0053] Fig. 16 shows the tool holder 145 with the insert tool 590 of Fig. 15, wherein the dust sealing element 170 is arranged in the receptacle 224 and the further dust sealing element 280 is arranged in the receptacle 226. The two dust sealing elements 170, 280 or the associated receptacles 224, 226 are arranged spaced apart from one another in the longitudinal direction 201. Illustratively, the two dust sealing elements 170, 280 are shown in accordance with the embodiment of Fig. 5, Fig. 6 and Fig. 12 trained.

[0054] Fig. 17 shows the tool holder 145 with the insert tool 590 of Fig. 5, wherein the insert tool 590 has a larger diameter than the insert tool 590 of Fig. 5. In Fig. 17 is the dust sealing element 170 according to the third arrangement of Fig. 13 is arranged on the inner circumference 1312 of the inner receptacle 212. Preferably, the tool holder 145 is Fig. 17 designed as a HEX tool holder, preferably with a 28 mm internal receptacle.

[0055] Fig. 18 shows the tool holder 145 with the insert tool 590 of Fig. 17, wherein the dust sealing element 170 is arranged in the receptacle 224 and the further dust sealing element 280 is arranged in the receptacle 226. The two dust sealing elements 170, 280 and the associated receptacles 224, 226 are arranged spaced apart from one another in the longitudinal direction 201.

[0056] Fig. 19 shows the tool holder 145 of Fig. 5, Fig. 10 to Fig. 12, Fig. 15 and Fig. 16 without the insert tool 590 with an alternative dust sealing element 170. The dust sealing element 170 is connected to the second cap 520 via a bellows 1910. Preferably, the dust sealing element 170 is formed integrally with the second cap 520. In this case, the bellows 1910 is arranged between the free end 211 of the tool holder 145 and a side wall 1920 of the first cap 510 of the protective cap 140. Furthermore, the dust sealing element 170 has at its free end 1930 in an unloaded state, as in Fig. 19, has a diameter 1931. In the unloaded state, the diameter 1931 is smaller than a diameter 1941 of the inner receptacle 212. This makes it possible to grip an insert tool arranged in the tool holder 145 with preload.

[0057] It should be noted that any number of dust sealing elements 170 and 280 may be present. Furthermore, the different embodiments of the dust sealing elements 170, 280 and / or the different arrangements of the dust sealing elements 170, 280 may be combined. For example, at least one two-part dust sealing element 170 may be used as shown in Fig. 7, Fig. 8, Fig. 10 and Fig. 11 shown in the first arrangement of Fig. 2, Fig. 3 and Fig. 5 and / or the third arrangement of Fig. 12 to Fig. 18. Furthermore, at least two differently designed dust sealing elements, e.g. a dust sealing element 170 of Fig. 2 to Fig. 4, Fig. 13 and Fig. 14 and a two-part dust sealing element 170 of Fig. 7 and Fig. 8 in a common recording, e.g. recording 224 of Fig. 2. In addition, the tool holder 145 can also have a plurality of receptacles 224 for arranging dust sealing elements, wherein the receptacles 224 can be designed according to the different arrangements. Thus, the tool holder 145 can have a receptacle 224 according to the first arrangement of Fig. 2 and Fig. 3, which is formed on the inner circumference 222 of the protective cap 140, and a further receptacle 224 according to the second arrangement of Fig. 7 to Fig. 9, in which the receptacle 224 is formed between the free end 211 of the tool holder 145 and a side wall 711 of the protective cap 140, and / or a further receptacle 224 according to the third arrangement of Fig. 13 and Fig. 14, in which the receptacle 224 is formed on an inner circumference 1312 of the inner receptacle 212.

Claims

[1] Hand-held power tool (100) with a tool holder (145) for receiving an insert tool (190; 590), wherein the tool holder (145) has at least one dust sealing element (170) which is arranged in an associated holder (224), characterized by in that the at least one dust sealing element (170) is designed to enclose, with prestress, an insert tool (190; 590) which can be arranged in the tool holder (145), wherein the at least one dust sealing element (170) is arranged in the associated holder (224, 226) so as to be movable in the radial direction (202) of the tool holder (145) and an inner diameter (243) of the associated holder (224) is greater than an outer diameter (242) of the at least one dust sealing element (170). [2] Hand tool according to claim 1, characterized bythat the tool holder (145) has a protective cap (140), wherein the associated holder (224) is formed on an inner circumference (222; 522) of the protective cap (140). [3] Hand tool according to claim 2, characterized by that the protective cap (140) has a first cap (510) and a second cap (520) arranged in the first cap (510), wherein the first cap (510) comprises metal and the second cap (520) comprises plastic. [4] Hand tool according to claim 3, characterized by that the associated receptacle (224) is formed on the second cap (520). [5] Hand tool according to claim 4, characterized by that the at least one dust sealing element (170) is connected to the second cap (520) via a bellows (1910). [6] Hand tool according to one of the preceding claims, characterized bythat the associated receptacle (224) is arranged at a free end (211) of the tool holder (145). [7] Hand tool according to one of the preceding claims, characterized by that the tool holder (145) has an inner receptacle (212), wherein the associated receptacle (224) is formed on an inner circumference (1312) of the inner receptacle (212). [8] Hand tool according to one of the preceding claims, characterized by that the at least one dust sealing element (170) comprises rubber. [9] Hand tool according to one of the preceding claims, characterized by that the at least one dust sealing element (170) has a holding portion (732) and a sealing portion (731; 1031), wherein the holding portion (732) comprises metal and the sealing portion (731; 1031) comprises rubber. [10] Hand tool according to one of the preceding claims, characterized bythat at least one further dust sealing element (280) is provided, wherein the at least one further dust sealing element (280) is assigned a separate receptacle (226), or wherein the at least one dust sealing element (170) and the at least one further dust sealing element (280) are arranged next to one another in the assigned receptacle (224).

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