Portable power tool

Abstract

A portable power tool, in particular an angle grinder, includes a housing that accommodates a drive and an electronic device with an interface configured to electrically connect the electronic device. The power tool further includes a housing inner part that is configured as a drive housing and supports the electronic device. The interface has at least one first electrical interface contact region and at least one second interface contact region spaced apart from the first interface contact region. At least one insulating element spaced apart from the interface contact regions is arranged between the housing inner part and the electronic device. The insulating element is configured to avoid an electrical short-circuiting connection between the first interface contact region and the second interface contact region.

Claims

1. A portable power tool, comprising: a housing having at least one of a housing cover or a housing half-shell; a drive arranged in the housing; an electronic device arranged in the housing and having an interface configured to electrically connect the electronic device, the interface having at least one first electrical interface contact region and at least one second interface contact region that is spaced apart from the first interface contact region; a housing inner part configured as a drive housing, the housing inner part supporting the electronic device; and at least one insulating element spaced apart from the first and second interface contact regions and arranged between the housing inner part and the electronic device, the insulating element configured to avoid an electrical short-circuiting connection between the first interface contact region and the second interface contact region, wherein the insulating element is configured as a filling element that fills a clearance between a surface of the housing inner part and a surface of the electronic device.

2. The portable power tool as claimed in claim 1, wherein: the insulating element forms a first chamber region and a second chamber region, which is spaced apart from the first chamber region, the insulating element separates the first chamber region from the second chamber region, at least in one section, along a plane, and the first chamber region has the first interface contact region, and the second chamber region has the second interface contact region.

3. The portable power tool as claimed in claim 2, wherein the plane extends (i) parallel to a main direction of extent of the portable power tool or (ii) orthogonally to the main direction of extent of the portable power tool.

4. The portable power tool as claimed in claim 1, wherein the filling element is elastically deformable and is preloaded between the surface of the housing inner part and the surface of the electronic device so as to fill the clearance.

5. The portable power tool as claimed in claim 1, wherein the clearance has an extent between the surface of the housing inner part and the surface of the electronic device of less than 2 mm.

6. The portable power tool as claimed in claim 5, wherein the extent of the clearance is less than 0.6 mm.

7. The portable power tool as claimed in claim 1, wherein the electronic device is configured as one or more of an electric on/off switch, an electric open-loop control unit, and an electric closed-loop control unit.

8. The portable power tool as claimed in claim 7, wherein the insulating element surrounds the on/off switch in an L shape or C shape and delimits at least two sides or at least three sides of the electronic device in at least one plane.

9. The portable power tool as claimed in claim 1, wherein the insulating element surrounds the electronic device in an L shape or C shape and delimits at least two sides or at least three sides of the electronic device in at least one plane.

10. The portable power tool as claimed in claim 1, further comprising: at least one further insulating element, which is configured to avoid an electrical short-circuiting connection between the first interface contact region and the second interface contact region, is arranged between the housing inner part and the electronic device.

11. The portable power tool as claimed in claim 10, wherein the electronic device is configured as an open-loop and/or closed-loop control unit, and wherein the at least one further insulating element is arranged between the housing inner part and the open-loop and/or closed-loop control unit.

12. The portable power tool as claimed in claim 1, wherein the insulating element is configured as an integral shaped stamped part that includes a foam.

13. The portable power tool as claimed in claim 12, wherein the foam is a polyurethane foam.

14. The portable power tool as claimed in claim 1, wherein the portable power tool is configured as an angle grinder.

15. The portable power tool as claimed in claim 1, wherein the clearance defined at least partially in a direction perpendicular to a main direction of extent of the power tool.

16. A portable power tool, comprising: a housing having at least one of a housing cover or a housing half-shell; a drive arranged in the housing; an electronic device arranged in the housing and having an interface configured to electrically connect the electronic device, the interface having at least one first electrical interface contact region and at least one second interface contact region that is spaced apart from the first interface contact region; a housing inner part that is configured as a drive housing and supports the electronic device; and at least one insulating element spaced apart from the interface contact regions and arranged between the housing inner part and the electronic device, the insulating element configured to avoid an electrical short-circuiting connection between the first interface contact region and the second interface contact region, wherein the insulating element is configured as a film with at least one film surface having a self-adhesive layer configured to connect the film to one or more of the housing inner part and the electronic device.

17. A portable power tool, comprising: a housing having at least one of a housing cover or a housing half-shell; a drive arranged in the housing; an electronic device arranged in the housing and having an interface configured to electrically connect the electronic device, the interface having at least one first electrical interface contact region and at least one second interface contact region that is spaced apart from the first interface contact region; a housing inner part that is configured as a drive housing and supports the electronic device; and at least one insulating element spaced apart from the interface contact regions and arranged between the housing inner part and the electronic device, the insulating element configured to avoid an electrical short-circuiting connection between the first interface contact region and the second interface contact region, wherein: the electronic device has a first labyrinth seal element configured as a sealing groove, the housing inner part has a second labyrinth seal element configured as a sealing protrusion, and the insulating element is (i) arranged in or on one or more of the first labyrinth seal element and the second labyrinth seal element and (ii) configured to prevent material transport of metal chips.

18. The portable power tool as claimed in claim 17, wherein the electronic device is configured as an on/off switch.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further advantages will become apparent from the following description of the drawings. The drawings illustrate illustrative embodiments of the disclosure. The drawings, the description and the claims contain numerous features in combination. A person skilled in the art will also expediently consider the features individually and combine them into worthwhile further combinations. In the drawings:

(2) FIG. 1 shows a perspective view of a portable power tool,

(3) FIG. 2 shows a segment of a cross section of the portable power tool shown in FIG. 1,

(4) FIG. 3 shows a cross section of the portable power tools shown in FIG. 1,

(5) FIG. 4 shows a view of an electronic device,

(6) FIG. 5 shows another view of the electronic device,

(7) FIG. 6 shows a perspective view of the electronic device,

(8) FIG. 7 shows a perspective view of a housing frame,

(9) FIG. 8 shows another view of a housing frame,

(10) FIG. 9 shows another view of a housing frame, and

(11) FIG. 10 shows another view of a housing frame.

DETAILED DESCRIPTION

(12) In the following description of the figures, identical components are provided with the same reference signs.

(13) FIG. 1 shows a portable power tool 12, which is formed by portable power tool 12 designed as an angle grinder. The portable power tool 12 comprises at least one switch unit 14, which has at least one actuating device 16 for actuation of at least one electric switch unit 18 (FIG. 2). A drive motor (not shown), which can be switched on and off by means of the switch unit 18, for driving a tool chuck 20 around a housing 22 is furthermore provided. The housing 22 extends along a direction of longitudinal extent 40 of the portable power tool 12.

(14) The portable power tool 12 furthermore comprises a grip housing 26 designed as a housing cover, a drive housing 28 designed as a drive housing, and an output housing 30. In an alternative embodiment, however, the housing parts (26, 28) can be of single-part or integral design. The drive housing 28 has a housing inner part 32, which extends in the direction of the grip housing 26 and, in a state in which it is connected to the grip housing 26, is surrounded by the grip housing 26 designed as a housing cover.

(15) Starting from a region of attachment 34 of the grip housing 26 to the drive housing 28, the grip housing 26 extends at least substantially in a direction of the grip housing 26 away from the region of attachment 34, in which a cable of the portable power tool 12 is arranged for the purpose of supplying power.

(16) Suitable power tools here include both a fixed power tool, e.g. a bench saw in accordance with applications DE 102010042016 or U.S. Pat. No. 2,062,969 A and a non-fixed, portable power tool, e.g. a circular hand saw in accordance with application DE 3740200 A1 or, for example, a brush cutter that can be worn on the back, in accordance with application DE 19616764 A1.

(17) FIG. 2 shows part of a cross section of the portable power tool through the plane 36 shown in FIG. 1. A drive (not shown) and two electronic devices 38a, 38b, each having an interface 40a, 40b for electrically connecting the electronic devices 38a, 38b, are accommodated in the housing 22. The drive housing 28 is formed in one piece with the housing inner part 32. In an assembled state of the portable power tool 12, the housing inner part 32 is surrounded by the grip housing 26. The housing inner part 32 of the drive housing 28 is intended to support an electronic device 38a, 38b in that the drive housing 28 at least partially surrounds the electronic devices 38a, 38b. The housing inner part 32 is intended to leave the electronic devices 38a, 38b exposed in an unassembled state of the portable power tool 12 and to support them positively and nonpositively in the housing inner part 32 in an assembled state. The housing inner part 32 is designed as a housing frame.

(18) The portable power tool 12 has two electronic devices 38a, 38b. One of the electronic devices 38a is designed as an on/off switch 42a. The interface 40a of the on/off switch 42a has four interface contact regions 44a, 44b, 46a, 46b (FIG. 5, FIG. 10). The four interface contact regions 44a, 44b, 46a, 46b are divided into a first interface contact region 44a and a second interface contact region 44b, which transmit an electric current from the on/off switch 42a, in particular directly, to the drive unit by means of two leads 48a, 48b, and into an additional first interface contact region 46a (FIG. 10) and an additional second interface contact region 46b (FIG. 10), which form an electrical connection to a further electronic device 38a. The interface contact regions 44a, 44b, 46a, 46b of the on/off switch 42a are arranged in an outer region 50 of the on/off switch 42a and are exposed in the outer regions 50 of the on/off switch 42a. The interface contact regions 44a, 44b, 46a, 46b protrude in the outer regions 50 of the on/off switch 42a in order to ensure good accessibility of the interface contact regions 44a, 44b, 46a, 46b.

(19) The further electronic device 42b is designed as an open-loop and/or closed-loop control unit 42b. The interface 40b of the open-loop and/or closed-loop control unit 42b has at least one further first electrical interface contact region 52a and at least one further second interface contact region 52b spaced apart from the further first interface contact region 52a. The interface contact regions 52a, 52b are arranged in an outer region of the electronic device 42b and are exposed in the outer region 54 of the open-loop and/or closed-loop control unit 42b. The interface contact regions 52a, 52b protrude in the outer region 54 of the open-loop and/or closed-loop control unit 42b in order to ensure good accessibility of the interface contact regions 52a, 52b.

(20) The additional interface contact regions 46a, 46b are designed as plug connectors and are intended to form an electrical connection to the further interface contact regions 52a, 52b, which are designed as plug sockets.

(21) The portable power tool 12 has an insulating element 56a, which is arranged between the housing inner part 32 and the on/off switch 42a. The insulating element 56a is arranged at a distance from the interface contact regions 44a, 44b, 46a, 46b. The insulating element 56a is intended to avoid an electrical short-circuiting connection between the first interface contact region 44a and the second interface contact region 44b.

(22) The portable power tool 12 has a further insulating element 56b, which is arranged between the housing inner part 32 and the open-loop and/or closed-loop control unit 42b. The further insulating element 56b is arranged at a distance from the further interface contact regions 46a, 46b. The further insulating element 56b is intended to avoid an electrical short-circuiting connection between the further first interface contact region 46a and the further second interface contact region 46b.

(23) The insulating element 56a, 56b is formed in one piece or from a coherent part. The insulating element 56a, 56b is designed as a filling element. The insulating element 56a, 56b is designed to be elastically deformable. The insulating element 56a, 56b is designed as a one-piece shaped stamped part. The insulating element 56a, 56b contains a PU foam or consists thereof. The further insulating element 56b is of T-shaped design (FIG. 10). The insulating element 56a, 56b is designed as a film which has at least one film surface having a self-adhesive layer for connecting the film to the housing inner part 32 and/or to the on/off switch 42a or open-loop and/or closed-loop control unit 42b. The insulating element 56a, 56b is bonded onto a housing inner part 32 by means of the self-adhesive layer. As an alternative or in addition, the insulating element 56a, 56b can be bonded onto the electronic device 42a, 42b by means of the self-adhesive layer.

(24) The insulating element 56a, 56b is intended to fill a clearance 58a, 58b between the housing inner part 32 and the electronic device 42a 42b or the on/off switch 42a and/or the open-loop and/or closed-loop control unit 42b in order to prevent deposition of metal chips in the clearance 58a, 58b. The clearance 58a, 58b has an extent of less than 1.2 mm between the housing inner part 32 and the on/off switch 42a or the open-loop and/or closed-loop control unit 42b.

(25) The insulating element 56a, 56b is designed to be elastically deformable. The insulating element 56a, 56b has a material thickness which is greater than the clearance 58a, 58b between the housing inner part 32 and the on/off switch 42a or the open-loop and/or closed-loop control unit 42b, with the result that the insulating element 56a, 56b completely fills the clearance 58a, 58b. The insulating element 56a, 56b has a material thickness of about 0.8 or 0.6 mm.

(26) The insulating element 56a is of C-shaped design and surrounds the on/off switch 42a. The insulating element 56a, 56b delimits at least three sides of the on/off switch 42a in at least one plane 36. The insulating element 56a is arranged on the on/off switch 42a in such a way that the insulating element 56a, 56b extends at least substantially in a direction away from the interface contact regions 44a, 44b, 46a, 46b.

(27) The on/off switch 42a has a switch actuating element 60 designed as a push button, which is intended to actuate the on/off switch 42a. The interface contact regions 44a, 44b, 46a, 46b are arranged on a drive side 62 of the on/off switch 42a, said side facing away from the switch actuating element 60.

(28) The on/off switch 42a has a first labyrinth seal element 64a (FIG. 3). The housing inner part 32 has a second labyrinth seal element 66a. The insulating element 56a is arranged in or on the first labyrinth seal element 64a and is intended to prevent material transport of metal chips. In particular, the first labyrinth seal element 64a can be designed as a sealing groove. The second labyrinth seal element 66a is designed as a sealing protrusion. The first and/or the second labyrinth seal element 64a, 66a are/is intended to form a mutually corresponding labyrinth seal 68a. Through the combination of a labyrinth seal 68a with the insulating element 58a, material transport, e.g. of metal dust containing metal chips, can be avoided.

(29) Similarly to the labyrinth seal 68a, the housing inner part 32 can have a further labyrinth seal 68b, which has a further first labyrinth seal element 64b on the open-loop and/or closed-loop control unit 42b, said element being designed as a sealing groove and/or as a sealing protrusion, and a further second labyrinth seal element 66b on the housing inner part 32, said element being designed as a sealing protrusion and/or sealing groove.

(30) The insulating element 56a, 56b is designed as a flat insulating strip. The insulating element 56a, 56b is formed from a material through which it is impossible per se for dust, in particular metal dust, to flow, and therefore it is not possible for any metal chips/particles to pass through the insulating element 56a, 56b.

(31) In FIG. 4 and FIG. 5, the insulating element 56a, 56b forms a first chamber region 70a and a second chamber region 70a spaced apart from the first chamber region 70a, at least in some section or sections. The insulating element 56a, 56b separates the first chamber region 70a from the second chamber region 70b, at least in some section or sections, along a plane 36 which extends parallel to a main direction of extent 40 of the portable power tool 12. The first chamber region 70a has the first interface contact region 44a. The second chamber region 70b has the second interface contact region 44b.

(32) Any properties and embodiments of the insulating element 56a which have been described are also intended to be applicable to the further insulating element 56b.

(33) The portable power tool 12 has at least one lead (not shown), which is intended to carry electric current between the interface contact regions 44a, 44b and the additional interface contact regions 52a, 52b.

(34) The on/off switch 42a is arranged on a first side of the housing inner part 32, and the open-loop and/or closed-loop control unit 42b is arranged on a second side of the housing inner part, which faces away from the first side. In an assembled state of the portable power tool 12, the additional interface contact regions 46a, 46b of the on/off switch 42a make contact with the further interface contact regions 52a, 52b of the open-loop and/or closed-loop control unit 42b. The on/off switch 42a and the open-loop and/or closed-loop control unit 42b are arranged opposite one another in an assembled state.

(35) In an assembled state of the portable power tool 12, the further interface contact regions 52a, 52b of the open-loop and/or closed-loop control unit 42b are separated by a housing frame 74 of the housing inner part 32. In an assembled state, the further interface contact regions 52a, 52b each extend through two apertures 76 in the housing inner part 32, which are separated by the housing frame 74.

(36) The further insulating element 56a, 56b is arranged substantially on the housing frame 74 of the housing inner part 32 and fills a clearance 78a, 78b between the open-loop and/or closed-loop control unit 42b and the housing frame 74 of the housing inner part 32.

(37) The open-loop and/or closed-loop control unit 42b furthermore has two projecting holding arms 80a, 80b (FIG. 8), which each extend through the apertures 76 (FIG. 9) in the housing inner part 32 in an assembled state. The holding arms 80a, 80b each have a holding groove 82a, 82b, which is intended to interact with holding protrusions 84a, 84b (FIG. 8) of the on/off switch 42a in order to fix the on/off switch 42a relative to the open-loop and/or closed-loop control unit 42b. The holding arms 80a, 80b are designed as snap-fit arms.

(38) In particular, the insulating element 56a, 56b can be provided between an electronic device and a magnetic wheel region, wherein the magnetic wheel region forms a region in the direct vicinity of the electric motor.