EP3573790A1

EP3573790A1 - Portable power tool

Info

Publication number: EP3573790A1
Application number: EP17817755.6A
Authority: EP
Inventors: Cornelius Boeck; Daniel BARTH; Rainer Vollmer; Sinisa Andrasic; Manfred Lutz; Andreas Wolf; Peter Stierle
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2017-01-27
Filing date: 2017-12-20
Publication date: 2019-12-04
Anticipated expiration: 2037-12-20
Also published as: US20190375089A1; CN110214070A; US11565395B2; EP3573790B1; CN110214070B; WO2018137861A1; DE102017201311A1

Abstract

The invention relates to a portable power tool, in particular an angle grinder, comprising a housing (22) which has in particular at least one housing cover or a housing half-shell and in which a drive and an electronic device (42a, 42b) having an interface (40a, 40b) for electrically connecting the electronic device are accommodated, and a housing inner part (32) which is configured in particular as a drive housing and supports the electronic device, wherein the interface has at least one first electrical interface contact region (44a, 46a, 52a) and at least one second interface contact region (44b, 46b, 52b) spaced apart from the first interface contact region. It is proposed that at least one insulating element (56a, 56b) spaced apart from the interface contact regions be arranged between the housing inner part and the electronic device, said insulating element (56a, 56b) being intended to avoid an electrical short-circuiting connection between the first interface contact region and the second interface contact region.

Description

Description title

Hand tool

The invention relates to a hand tool, in particular an angle grinder, according to the preamble of the first claim.

State of the art

Hand power tools are known from the prior art with a housing and with an electronics unit accommodated inside the housing. This electronic unit is used in the housing such that the electronics unit is held positively and / or non-positively in the housing relative to the housing. Due to production-related tolerances can not be prevented that form gaps between the electronic unit and the housing. These gaps can fill with dirt.

Disclosure of the invention

The invention is based on the object with simple constructive

Measures a hand tool, especially an angle grinder to improve.

The object is achieved with a hand tool, in particular angle grinder, comprising a, in particular at least one housing cover or a housing half shell exhibiting, housing in which a drive and an electronic device with an interface for electrical

Connection of the electronic device are included, and a, in particular designed as a drive housing, housing inner part, which the

Electronic device stores, wherein the interface has at least a first electrical interface contact area and at least one spaced from the first interface contact area second interface contact area.

According to the invention is between the housing inner part and the

Electronic device arranged at least one spaced apart from the interface contact areas insulation element, which is intended to provide an electrical short-circuit connection between the first

Interface contact area and the second interface contact area to avoid.

When processing, for example, metal workpieces are small

Removed metal chips / particles from the workpiece and get into the immediate vicinity. These metal chips / particles can get from the environment in the power tool by this example by

Air inlet openings are sucked into the power tool and with a cooling the hand tool machine cooling air into the interior of the

Get angle grinder. The metal chips / particles can thereby deposit / settle in the interior of the portable power tool and thereby soil and clog the power tool.

Especially in factories, such as foundry cleaning companies, users wear protective clothing and respiratory protection to protect themselves against the metal chips in the air, and stick their clothes around the neck, around the wrists and ankles, with adhesive tape, so that the Fine metal chips / particles, which circulate as metal dust in the ambient air, can not penetrate through the spaces between two adjacent clothing pieces.

Since the metal shavings / particles are usually good electrical conductors, the metal shavings / particles can lead to a short circuit if adjacent electrical interface contact areas become clogged with metal shavings / particles. This can lead to the failure of components, for example, by the formation of Creepage currents inside the device comes and an electrical connection is formed, which connects, for example, two adjacent interface contact areas together. Due to production-related tolerances of two adjacent components to be mounted in the interior of the power tool is to be expected in the rule with gaps between the components to be mounted. These production-related tolerances can cause the gaps to fill with metal chips / particles.

The hand tool can be designed as an angle grinder and form, for example, a grinding, cutting or polishing machine.

The housing inner part may be provided to the components such as

For example, expose the electronic device in a non-mounted state and in a mounted state positively and / or non-positively in the housing, in particular the housing inner part to store. Due to manufacturing tolerances between the housing inner part and the components may occur, which is a gap between the components and the

Housing can form part.

The housing may be formed integrally with the housing inner part. The housing inner part is surrounded in a mounted state of the power tool by a further, in particular designed as a housing cover, housing.

The interface of the electronic device is designed as an electrical interface and provided to an electrical connection with a

Power unit, such as a power supply or designed as a battery pack electric power storage to allow.

Such electrical interfaces are state of the art and well-known to a person skilled in the art, so that such interfaces are not further elaborated.

Such interfaces have at least two interface contact areas, which are intended to generate an electric current flow, which at least partially flows through the electronic device upon actuation of the electronic device and, for example, from the first

Interface contact area at least partially to the second

Interface contact area is forwarded.

In particular, the interface contact areas may be exposed at an outer area of the electronic device. Preferably, the

Interface contact areas protrude at an outer area of the electronic device to ensure good accessibility of the interface contact areas.

The interface contact areas are formed electrically suffering. The interface contact areas may contain or consist of a metal material.

The hand tool may have lines, which with the

Interface contact areas are connected and intended to conduct electrical power.

An "electronic device" is to be understood as meaning, in particular, a device which influences at least one electric current in a gas, in a conductor, in a vacuum and / or advantageously in a semiconductor, Preferably, the electronic device may comprise at least one transistor, in particular at least one microprocessor Preferably, the

Electronic device having a switch.

In particular, the insulating element can serve to increase the shortest possible distance of the metal chips to the interface contact areas when an accumulation of metal chips / particles in the interior of the housing by the insulating element is arranged between the interface contact areas.

In particular, the insulation element can be made in one piece or from one

contiguous part or multiple parts or several consecutive be arranged arranged isolation elements. The insulation elements can be designed as flat insulation strips. Preferably, the insulation element may be formed of a material which can not be penetrated by dust, in particular metal dust, so that any, if any, material is present

Metal chips / particles can not pass through the insulation element.

In this context, an "insulation element" is to be understood as meaning, in particular, a layer which has a high insulation resistance and / or a low electrical conductivity Preferably, the insulation layer consists at least partially of a material with a high level of insulation

Insulation resistance. In this context, a "high insulation resistance" is to be understood as meaning a resistance of at least 50Ω, preferably of at least 300Ω, and particularly preferably of at least 500Ω.Furthermore, it is proposed that the insulation layer consist at least partially of a technical plastic.

In particular, the insulation element can be elastic and compressible, which is intended to mean, in particular, an element which, in a normal operating state, is at least 10%, in particular at least 20%, preferably at least 30% and particularly advantageously at least 50% % elastically changeable, and in particular generates a dependent on a change in the extension and preferably proportional to the change of counterforce, which counteracts the change. An "extension" of an element should, in particular, be understood as a maximum distance between two points of a vertical projection of the element onto a plane

Tolerance differences between housing inner parts and electrical device can be compensated. The dependent claims give appropriate developments of

Hand tool according to the invention.

It may be expedient that the insulation element has a first

Chamber area and one to the first chamber area at least forms the second chamber area at least partially along one, in particular parallel and / or orthogonal to a

Main extension direction of the power tool extending plane separates from the second chamber portion, wherein the first chamber portion has the first interface contact area and the second chamber area has the second interface contact area. This can ensure that the shortest route between the two

Interface contact areas is increased. A chamber is to be understood as an intermediate space which is delimited, at least in sections, for example, by the housing inner part and the electronic device and in particular at least in sections between the insulating element and the chamber region. In particular, the chamber region may be formed as a gap between the housing inner part and the electronic device.

Furthermore, it may be expedient that the insulation element is designed as a filling element. In particular, the insulation element can be formed elastically deformable. Preferably, the filling element may be provided to a distance space between the housing inner part and the

Electronic device to fill. As a result, the insulation element can separate or insulate the two interface contact areas from one another in a particularly simple manner. Furthermore, as a result, a bias voltage between the housing inner part and the electronic device can be achieved, so that Mirko vibrations between the electronic device and the

Housing inner part are reliably damped.

Since the isolation element can be used in existing hand-held power tools, an insulating element of compressible material may be preferred. Alternatively, the insulating member may include or be made of a material that is less elastic, such as a material that contains or consists of the housing inner part.

In particular, the insulating element between an electronic device and a Magnetradbereich be provided, wherein the Magnetradbereich represents an area in the immediate vicinity of the electric motor.

Furthermore, it may be expedient that the distance space has an extension between the housing inner part and the electronic device of less than 2 mm, in particular less than 1, 5 mm, preferably less than 1, 2 mm, preferably less than 1 mm, more preferably less than 0.8 mm, more preferably less than 0.6 mm, .. This allows distances between the housing inner part and the electronic device can be reduced or avoided.

The insulating element may extend between the housing inner part and the electronic device in such a way that the insulating element is an extension of the distance between the housing inner part and the

Electronic device, in particular completely, fills. It can do that

Insulation element in particular be designed so elastic that it is ensured that the distance space between the housing inner part and the electronic device is filled. Preferably, the insulating element can penetrate through the entire

Have material thickness of the insulating member extending material breakthrough, which may be formed for example as a slot. The material breakthrough can be completely surrounded by the insulating element. As a result, assembly forces can be reduced when mounting the electronic device with the housing inner part.

Alternatively, the insulating element may extend such that the

Isolation element an extension of the distance space between the

Housing inner part and the electronics device only partially filled. In this case, the insulation element an extension between the housing inner part and the

Have electronic device which less than 1, 5 mm, in particular less than 1, 2 mm, preferably less than 1, 0 mm, preferably less than 0.8 mm, more preferably less than 0.6 mm, corresponds to and provided is the distance space between the housing inner part and the

Electronics device to reduce or completely fill.

It is further proposed that the electronic device is designed as an electrical on / off switch and / or as an electrical control and / or regulating unit. A "control and / or regulating unit" should be understood in particular a unit with at least one control electronics, which in particular a unit with a processor unit and with a

Storage unit as well as with a stored in the storage unit

Operating program.

Furthermore, it may be expedient that the insulation element C-shaped surrounds the electronic device, in particular an on / off switch.

In particular, the insulation element can limit at least three sides of the electronic device in at least one plane. It may also be expedient that the insulation element L-shaped the electronic device,

in particular the on / off switch, surrounds and, in particular in at least one plane limits at least two sides of the electronic device.

Preferably, the insulation element can be at the

Be arranged electronics device, that the insulating element extends at least substantially in a direction away from the interface contact areas direction. This allows the

Interface contact areas are particularly effectively separated from each other. Conveniently, the trained as an on / off switch

Electronic device designed as a push button

Have switch actuator, which is intended to operate the on / off switch. The interface contact areas can preferably be arranged on a side of the on / off switch which faces away from the switch actuating element.

It is suggested that between the housing inner part and the

Electronic device, in particular a control and / or regulating unit, a further insulating element is arranged, which is intended to provide an electrical short-circuit connection between the first Interface contact area and the second interface contact area to avoid. As a result, an accumulation of metal chips can be prevented. It is further proposed that the isolation element as a one-piece

Form punched part is formed, which in particular contains a foam, preferably a polyurethane foam, or consists thereof. In particular, the insulating element may comprise or consist of a plastic material, preferably a material such as TPE or NBR may be used as the plastic material. Preferably, the

Insulation element have a material thickness of more than 0.8 mm, in particular more than 1 mm. In this case, a plastic material such as rubber Moss with a material thickness of about 1, 2 mm can be used. In particular, the insulation element may be T-shaped, which preferably forms a T-shape from two separate insulation strips. This can do that

Isolation be particularly simple design.

It may be expedient that the insulation element is formed as a film which has at least one film surface with a self-adhesive layer for connecting the film to the housing inner part and / or the

Electronic device has. In particular, the insulating element, in particular by means of the self-adhesive layer, be glued to a housing inner part and / or the electronic device. Alternatively, the

Isolation element be placed on the housing inner part, so that the

Insulating element between the housing inner part and the electronic device is frictionally held or clamped. Alternatively, the

Insulation element are molded onto the housing inner part or to the electronic device. Further alternatively, the insulating element on the

Housing inner part or foamed at the electronics device.

As a result, the power tool can be produced particularly easily.

Furthermore, it may be expedient that the electronic device, in particular an on / off switch, has a first labyrinth seal element and that Housing inner part has a second labyrinth seal member. In particular, the isolation element in or on the first and / or second

Labyrinthdichtungselement be arranged and be intended to prevent mass transfer. In particular, the first

Labyrinth seal element be designed as a seal groove. Preferably, the second labyrinth seal member may be formed as a seal elevation. The first and / or the second labyrinth seal element may be provided to form a labyrinth seal. By combining a labyrinth seal with the insulation element, mass transport of, for example, metal dust-containing metal dust can be avoided.

Brief description of the drawings

Further advantages emerge from the following description of the drawing. In the drawings, embodiments of the invention are shown. The

Drawings, the description and the claims contain numerous

Features in combination. The skilled person will become the characteristics

expediently also consider individually and to meaningful further

Combine combinations. Hereby shows:

1 is a perspective view of a hand tool,

2 shows a section of a cross section of the hand tool of FIG. 1,

3 shows a cross section of the hand tool of FIG. 1,

4 is a view of an electronic device,

5 is a further view of the electronic device,

6 is a perspective view of the electronic device,

7 is a perspective view of a housing frame,

8 is another view of a housing frame,

Fig. 9 is another view of a housing frame and

Fig. 10 is another view of a housing frame.

In the following figures, the same components are provided with the same reference numerals. FIG. 1 shows a hand-held power tool 12 which is used by a machine tool 12

Angle grinder trained portable power tool 12 is formed. The portable power tool 12 includes at least one switching unit 14, the at least one actuator 16 to a

Actuation at least one electrical switching unit 18 (Figure 2).

Furthermore, a drive motor (not shown) which can be switched on and off via the switching unit 18 is arranged around a housing 22 for driving a tool holder 20. The housing 22 extends along a

Longitudinal direction 40 of the power tool 12.

The handheld power tool 12 further comprises a housing housing designed as a handle housing 26, designed as a drive housing

Drive housing 28 and a driven housing 30. In an alternative

Embodiment, the housing parts (26, 28), however, in one piece or

be formed integrally. The drive housing 28 has a housing inner part 32 which extends in the direction of the handle housing 26 and is surrounded in a connected to the handle housing 26 state of the housing cover designed as a handle housing 26.

The handle housing 26 extends at least substantially starting from a connection region 34 of the handle housing 26 to the drive housing 28 in a direction away from the connection region 34 direction of the handle housing 26 to which a cable of the portable power tool 12 for

Power supply is arranged.

As a machine tool is both a stationary

Machine tool such as a table saw according to the applications DE 102010042016 or US 2062969 A, as well as a non-stationary hand tool such as a circular saw according to the application DE 3740200 A1 or as for example a back-supportive brush cutter according to the application DE 19616764 A1. 2 shows a part of a cross-section of the handheld power tool through the plane 36 of FIG. 1. In the housing 22 are a drive (not shown) and two electronic devices 38a, 38b, each with an interface 40a, 40b for electrically connecting the electronic devices 38a, 38b added. The drive housing 28 is formed integrally with the housing inner part 32. The housing inner part 32 is in an assembled state of

Hand tool 12 surrounded by the handle housing 26. The

Housing inner part 32 of the drive housing 28 is provided to store an electronic device 38a, 38b by the drive housing 28, the electronics devices 38a, 38b at least partially surrounds. The

Housing inner part 32 is provided to expose the electronic devices 38a, 38b in a non-mounted state of the power tool 12 and to store in a mounted state positive and non-positive in the housing inner part 32. The housing inner part 32 is formed as a housing frame.

The hand tool 12 has two electronic devices 38a, 38b. One of the electronic devices 38a is as an on / off switch 42a

educated. The interface 40a of the on / off switch 42a has four

Interface contact areas 44a, 44b, 46a, 46b (Fig. 5, Fig. 10) on. The four interface contact areas 44a, 44b, 46a, 46b are subdivided into a first interface contact area 44a and a second interface contact area 44b, which pass on an electrical current of the on / off switch 42a, in particular directly, to the drive unit by means of second lines 48a, 48b. and 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 another electronics device 38a. The interface contact areas 44a, 44b, 46a, 46b of the on / off switch 42a are arranged on an outer area 50 of the on / off switch 42a and open at the outer areas 50 of the on / off switch 42a. The

Interface contact areas 44a, 44b, 46a, 46b protrude from the outer areas 50 of the on / off switch 42a in order to ensure good accessibility

To ensure interface contact areas 44a, 44b, 46a, 46b. The further electronic device 42b is designed as a control and / or regulating unit 42b. The interface 40b of the control and / or regulating unit 42b has at least one further first electrical interface contact region 52a and at least one further second interface contact region 52b spaced from the further first interface contact region 52a. The interface contact regions 52a, 52b are arranged on an outer region 54 of the electronic device 42b and are open on the outer region 54 of the control and / or regulating unit 42b. The interface contact areas 52a, 52b project from the outer area 54 of the control and / or regulating unit 42b in order to ensure good accessibility of the interface contact areas 52a, 52b.

The additional interface contact areas 46a, 46b are as

Plug connections formed and provided to an electrical connection with the plug-in bushings designed as another

Interface contact areas 52a, 52b form.

The hand tool 12 has an insulation element 56a, which is arranged between the housing inner part 32 and the on / off switch 42a. The insulating member 56a is spaced from the

Interface contact areas 44a, 44b, 46a, 46b arranged. The

Isolation element 56a is intended to be an electrical

Short circuit connection between the first interface contact area 44a and the second interface contact area 44b to avoid.

The hand tool 12 has a further insulating element 56b, which between the housing inner part 32 and the control and / or

Control unit 42b is arranged. The further insulation element 56b is spaced apart from the further interface contact regions 46a, 46b

arranged. The further insulation element 56b is intended to provide an electrical short-circuit connection between the other first

Interface contact area 46a and the other second

Interface contact area 46b to avoid. The insulation element 56a, 56b is in one piece or out of one

formed coherent part. The insulating member 56a, 56b is formed as a filling member. The insulation element 56a, 56b is elastically deformable. The insulation element 56a, 56b is formed as a one-piece molded part. The insulation element 56a, 56b contains a PU

Foam or consists of it. The further insulation element 56b is T-shaped (FIG. 10). The insulation element 56a, 56b is designed as a film which has at least one film surface with a self-adhesive layer for connecting the film to the housing inner part 32 and / or the on / off switch 42a or the control and / or regulating unit 42b. The

Insulation element 56a, 56b is glued by means of the self-adhesive layer on a housing inner part 32. Alternatively or additionally, the

Isolation element 56a, 56b by means of the self-adhesive layer on the

Electronics device 42a, 42b glued.

The insulation element 56a, 56b is provided to fill a clearance space 58a, 58b between the housing inner part 32 and the electronic device 42a, 42b or the on / off switch 42a and / or the control and / or regulating unit 42b by a deposit to prevent metal chips in the gap 58a, 58b. The spacer 58a 58b has an extension between the

Housing inner part 32 and the on / off switch 42a and the control and / or regulating unit 42b of less than 1, 2 mm.

The insulation element 56a, 56b is elastically deformable. The insulation element 56a, 56b has a material thickness which is greater than that

Distance space 58a, 58b between the housing inner part 32 and the on / off switch 42a and the control and / or regulating unit 42b, so that the insulation element 56a, 56b, the spacer space 58a, 58b completely fills. The insulation element 56a, 56b has a material thickness of about 0.8 or 0.6 mm.

The insulation element 56a is C-shaped and surrounds the on / off switch 42a. The insulation element 56a, 56b limits at least three sides of the on / off switch 42a in at least one plane 36. The insulation element 56a is disposed on the on / off switch 42a such that the

Isolation element 56a, 56b at least substantially in one of the

Interface contact areas 44a, 44b, 46a, 46b direction pointing away.

The on / off switch 42a has a trained as a push button

Switch actuator 60, which is intended to actuate the on / off switch 42a. The interface contact areas 44a, 44b, 46a, 46b are arranged on a drive side 62 of the on / off switch 42a facing away from the switch actuating element 60.

The on / off switch 42a has a first labyrinth seal member 64a (FIG. 3). The housing inner part 32 has a second labyrinth seal element 66a. The insulating member 56a is in or on the first one

Labyrinth seal member 64 a arranged and provided to a

Prevent material transport of metal shavings. In particular, the first labyrinth seal member 64a may be formed as a seal groove. The second labyrinth seal member 66a is formed as a seal elevation. The first and / or the second labyrinth seal element 64a, 66a are intended to form a labyrinth seal 68a which corresponds to one another.

By combining a labyrinth seal 68a with the insulation element 58a, mass transport of metal dust containing, for example, metal shavings can be avoided. Analogous to the labyrinth seal 68a, the housing inner part 32 can be another

Have labyrinth seal 68b, which has a further first formed as a seal groove and / or as a seal elevation labyrinth seal 64b on the control and / or regulating unit 42b and another as a sealing elevation and / or sealing groove as trained

Labyrinth seal element 66b on the housing inner part 32 has.

The insulation element 56a, 56b is formed as a flat insulation strip. The insulating element 56a, 56b is made of a per se by dust, in particular Metal dust, non-permeable material may be formed so that any metal chips / particles can not pass through the insulation element 56a, 56b.

The insulation element 56a, 56b forms a first one in FIGS. 4 and 5

Chamber portion 70a and at least partially spaced from the first chamber portion 70a second chamber portion 70b. The

Isolation element 56a, 56b separates the first chamber region 70a at least in sections along a plane 36 extending parallel to a main extension direction 40 of the handheld power tool 12 from the second chamber region 70b. The first chamber portion 70a has the first one

Interface contact area 44a. The second chamber area 70b has the second interface contact area 44b.

Any described properties and configurations of

Isolation element 56a should also be applicable to the further insulation element 56b.

The hand tool 12 has at least one line (not shown) which is intended to supply electrical current between the two

Interface contact areas 44a, 44b and the additional

Interface contact areas 52a, 52b to conduct.

The on / off switch 42a is arranged on a first side of the housing inner part 32 and the control and / or regulating unit 42b is arranged on a second side of the housing inner part facing away from the first side. The additional interface contact areas 46a, 46b of the on / off switch 42a contact the further interface contact areas 52a, 52b of the control and / or in an assembled state of the handheld power tool 12

Control unit 42b. The on / off switch 42a and the control unit 42b are in an assembled state with each other

arranged opposite.

The further interface contact areas 52a, 52b of the control and / or regulating unit 42b are in an assembled state Hand tool 12 by a housing frame 74 of the

Housing inner part 32 separately. The further interface contact areas 52a, 52b extend in an assembled state in each case by two

Recesses 76 in the housing inner part 32, which are separated by the housing frame 74.

The further insulation element 56a, 56b is substantially on the

Housing frame 74 of the housing inner part 32 is disposed and fills a clearance space 78 a, 78 b between the control and / or regulating unit 42 b and the housing frame 74 of the housing inner part 32nd

The control and / or regulating unit 42b also has two projecting holding arms 80a, 80b (FIG. 8), which in an assembled state respectively extend through the recesses 76 (FIG. 9) of the housing inner part 32. The support arms 80a, 80b each have a retaining groove 82a, 82b which is provided to cooperate with retaining projections 84a, 84b (Figure 8) of the on / off switch 42a about the on / off switch 42a opposite the control - And / or control unit 42 b to fix. The holder arms 80a, 80b are designed as snap arms.

In particular, the insulation element 56a, 56b may be connected between a

Electronic device and a Magnetradbereich be provided, wherein the Magnetradbereich represents an area in the immediate vicinity of the electric motor.

Claims

claims

1 . Hand tool, in particular angle grinder, comprising a, in particular at least one housing cover or a housing half shell exhibiting, housing (22), in which a drive and a

Electronic device (42a, 42b) with an interface (40a, 40b) for electrically connecting the electronic device (42a, 42b) are received, and a, in particular designed as a drive housing, housing inner part (32), which supports the electronic device (42a, 42b) wherein the interface (40a, 40b) has at least a first electrical interface contact region (44a, 46a, 52a) and at least one second interface contact region (44b, 46b, 52b) spaced from the first interface contact region (44a, 46a, 52a)

characterized in that between the housing inner part (32) and the electronic device (42a, 42b) at least one of the

Interface contact areas (44a, 44b, 46a, 46b, 52a, 52b)

spaced insulation element (56a, 56b) is arranged, which is intended to avoid an electrical short-circuit connection between the first interface contact area (44a, 46a, 52a) and the second interface contact area (44b, 46b, 52b).

2. Hand tool according to claim 1, characterized in that the insulating element (56 a, 56 b) forms a first chamber portion (70 a) and one to the first chamber portion (70 a) at least partially spaced second chamber portion (70 b), wherein the

Isolation element (56a, 56b) the first chamber portion (70a) at least in sections along one, in particular parallel and / or orthogonal to a main extension direction (40) of the

Hand tool (12) extending, level (36) of the second chamber portion (70 b) separates, wherein the first chamber portion (70 a) the first interface contact region (44a, 46a, 52a) and the second chamber region (70b) has the second interface contact region (44b, 46b, 52b).

Hand tool according to one of the preceding claims, characterized in that the insulating element (56a, 56b) is formed as a filling element and is elastically deformable, wherein the filling element is provided to a distance space between the housing inner part (32) and the electronic device (42a, 42b).

Hand tool according to Claim 3, characterized in that the spacing space has an extension between the housing inner part (32) and the electronic device (42a, 42b) of less than 2 mm,

in particular less than 1, 5 mm, preferably of less than 1, 2 mm, preferably less than 1, 0 mm, more preferably less than 0.8 mm, particularly preferably less than 0.6 mm.

Hand tool according to one of the preceding claims, characterized in that the electronic device (42a, 42b) as an electrical on / off switch (42a) and / or as an electrical control and / or regulating unit (42b) is formed.

Hand tool according to one of the preceding claims, characterized in that the insulating element (56a, 56b) L-shaped or C-shaped, the electronic device (42a, 42b), in particular the on / off switch (42a) surrounds, and, in particular at least one level (36) at least two sides or at least three sides of

Electronic device (42a, 42b) limited.

Hand tool according to one of the preceding claims, characterized in that between the housing inner part (32) and the electronic device (42a, 42b), in particular a control and / or regulating unit (42b), at least one further insulating element (56b) is arranged, which is provided, an electrical Short circuit connection between the first interface contact area (44a, 46a, 52a) and the second interface contact area (44b, 46b, 52b) to avoid.

Hand tool according to one of the preceding claims, characterized in that the insulating element (56a, 56b) is formed as a one-piece stamped part, which in particular a

Foam, preferably a PU foam, contains or consists of.

Hand tool according to one of the preceding claims, characterized in that the insulation element (56a, 56b) is formed as a film, which at least one film surface with a self-adhesive layer for connecting the film with the housing inner part (32) and / or the electronic device (42a, 42b).

0. Hand tool according to one of the preceding claims,

characterized in that the electronic device (42a, 42b), in particular an on / off switch (42a), as a sealing groove

formed first labyrinth seal member (64) and the housing inner part (32) has a formed as a seal elevation second labyrinth seal member (66), wherein the insulation element (56a, 56b) in or on the first and / or second labyrinth seal member (64,66) is arranged and is intended to prevent a mass transfer of metal chips.