EP2205397B1 - Protective device - Google Patents

Abstract

The invention relates to a protective device for a hand power tool (12a-k) for a rotating, preferably disc-shaped tool (14a-k), particularly for an angle grinder, comprising at least one base body unit (16a-k). According to the invention, the base body unit (16a-k) comprises an absorption element (18a-k) that is provided for deformation.

Description

State of the art

The invention relates to a protective device according to the preamble of claim 1.

It has already been proposed to provide protective devices for a hand tool machine for a rotating, preferably disk-shaped tool, in particular for an angle grinder, which are equipped with at least one main body unit.

From the generic US 4 218 853 A is already a protective device for a hand tool for a rotating, preferably disc-shaped tool, in particular for an angle grinder, known with at least one basic body unit, wherein the basic body unit at least a semi-disc-shaped base body and a base body wall which is arranged transversely to a main extension surface of the base body and the tool radially surrounds, and has an intended for deformation absorption element, wherein the basic body unit comprises at least two sub-areas, which have specifically different absorption properties, wherein the absorption element has a profiling for receiving kinetic energy.

Furthermore, from the not previously published WO 2008/049684 A1 and WO 2009/015929 A1 also already known protective devices for hand machine tools for a rotating, preferably disc-shaped tool, in particular for an angle grinder, with at least one basic body unit, in addition to the features of US 4 218 853 A the feature include that a main body wall has a profiling. Body walls with profiles are also off US 3,129,537 A. and US Pat. No. 3,808,749 known.

Advantages of the invention

The invention relates to a protective device for a hand tool for a rotating, preferably disc-shaped tool, in particular for an angle grinder, with at least one basic body unit, wherein the basic body unit at least one semi-disc-shaped base body and a base body wall which is arranged transversely to a main extension surface of the base body and the Radially surrounds tool, and having an intended for deformation absorption element, wherein the basic body unit comprises at least two sub-areas that have specifically different absorption properties, wherein the absorption element has a profiling for receiving kinetic energy, wherein the base body wall has the profiling.

It is proposed that the absorption element has at least one partial area with a sawtooth and / or a wave profile, the sawtooth and / or the wave profile extending in the circumferential direction along an outer side of the main body wall, which faces on a side of the main body wall facing away from the tool is arranged, and extends along an inner side of the main body wall, which is arranged on a tool-facing side of the base body wall. A "basic body unit" is to be understood here as meaning, in particular, a unit which has at least one base body means, such as a base body, a base body wall, a base body collar, a base body neck and / or a base body element. It is advantageous if at least one radial wall of the main body unit is provided, which forms the absorption element at least partially. Here, "radial wall" is to be understood as the part of the basic body unit which is arranged radially and extends at least along a partial area of the circumference of the tool. The radial wall may preferably be formed by the main body wall. By virtue of the configuration according to the invention, basic body means, which are unequal to the radial wall or the main body wall, can be realized in an unchanged basic form. It can be provided a stable and at the same time safe protection device. In this context, an "absorption element" should be understood to mean, in particular, an element which has a specific shaping intended for deformation and / or can be deformed particularly well owing to its material and / or construction properties and / or energy, in particular kinetic energy, such as for example, rotational energy, translational energy, Heat, etc., of parts that come into contact with the absorption element record. The absorption element can absorb energy by elastic and / or plastic deformability. By virtue of the configuration according to the invention, a risk of injury to an operator of the handheld power tool can advantageously be averted. The main body unit is preferably arranged around a disc-shaped and rotating tool of a hand tool, such as an angle grinder, so that by the absorption element in operation of the power tool sparks and / or material particles and / or in particular rotating and / or with great force to the outside hurled fragments of a In operation zerborstenen tool, such as a grinding wheel, a cutting disc, etc., can be absorbed advantageously.

A "profiling" is to be understood here in particular as a shaping configuration such as a slot, a perforation, a corrugated or a sawtooth profile, a concentric profile, a variation of the wall thickness, a multi-walled and / or another design that appears appropriate to a person skilled in the art , The arrangement of the profiling, an efficient energy absorption can be achieved in particular by an easy-to-implement deformation.

According to the invention, the basic body unit particularly advantageously comprises at least two partial areas which have specifically differing absorption properties. As a result, the protective device can be structurally designed simply for different load situations. If, for example, a first partial region is arranged in an edge and / or edge region of the protective device and if it is designed with the higher absorption characteristic or with a slight deformability than a second partial region which is located in a position facing away from the edge, the protective device can be targeted a most likely impact location of a fragment of the bursting tool.

An efficient and gradual release of the kinetic energy of impacting fragments of a damaged tool can advantageously be achieved if the absorption element has at least one partial area with a sawtooth and / or a wave profile. The sawtooth and / or the wave profile is particularly advantageously arranged in the base body wall and extends in the circumferential direction along the base body wall. The profile can be embossed and / or punched executed. Furthermore, it can advantageously be achieved that there is a contact time and / or reduces a contact distance that the tool fragment has with the protection device in the event of bursting and forceful movement out of the protection device. The repeated impact reduces the residual energy which is released to the attachment of the protective device to the machine tool. In addition, a comminution and / or a crumbling of the fragment can take place by a wandering through the profile or a repeated impact of the fragment on the absorption element, in particular in the circumferential direction one behind the other and pointing in the direction of the tool troughs.

In an alternative development of the subject matter of the invention, it is conceivable that the profiling represents at least one recess arranged in at least one subregion of at least one main body means of the main body unit. In this context, a "recess" is to be understood as meaning, in particular, an opening extending through an entire extension, preferably a thickness, of an object, such as a hole and / or a slot. By means of the recess arranged in the base body means, a targeted deformation of the protective device can be achieved at a location at which the energy absorption, after an energy maximum has been generated by, for example, a body mass a maximum impact of a fragment of a destroyed during operation of the power tool tool. A particularly homogeneous deformation and thus an efficient energy absorption can be achieved if the profiling and / or the recess is arranged in two and preferably in three base body means, such as the base body, the base body wall and / or the body trunk. It can also be provided more than one recess extending in the circumferential direction over the Base body means extend. Furthermore, the recesses may differ in their shapes.

Furthermore, it is conceivable that the recess represents a longitudinal opening which is arranged along a direction of the basic body unit pointing essentially radially outward. A "longitudinal opening" is to be understood here in particular as meaning an opening, in particular a slot, which has a longitudinal extent of at least twice as long, preferably 10 times as long and particularly advantageously 30 times as long as its extent in its width. However, another length-to-width ratio that appears appropriate to the person skilled in the art is also conceivable. In this context, the term "radially outward-pointing direction" should be understood to mean, in particular, a direction that runs along a line that extends from an imaginary center of the main body neck to a partial circle circumference of the main body. The addition "essentially" describes here that the longitudinal opening can be arranged at an angle of up to 10 ° in an intersection between the longitudinal opening and the line deviating from the line. Furthermore, more than one longitudinal opening may be provided, which may have different radial lengths, and these differently long longitudinal openings may be arranged alternately to one another and / or in groups, preferably in the circumferential direction.

Furthermore, it is conceivable that the basic body unit has at least two walls with different wall thicknesses. A first wall here preferably represents a wall of the base body wall and a second wall preferably represents a wall of the base body and / or the basic body collar. As a result, different absorption properties can be realized in a structurally simple and component-saving manner.

In addition, it is conceivable that at least one basic body means of the basic body unit is provided, which has different wall thicknesses. In this case, the base body means preferably represents the base body wall. The different wall thicknesses here preferably define elements or subregions of the sawtooth and / or wave profile. The profile has different partial regions, such as a thick flank facing a direction of rotation of the tool, and / or a thin flank extending in the radial direction of the main body and / or pointing in the direction of rotation of the tool, and / or a punched opening , which differ in their absorption properties. The inventive design can be ensured that the absorption element or a related profile weakness is located on a trajectory of a tool fragment and that little Motion energy of the impacting on the absorption element tool fragment is converted into an unwanted and dangerous movement of the protective device and / or the basic body unit.

Furthermore, it is conceivable that the absorption element has an at least substantially concentric profile. A "concentric profile" is to be understood here in particular as a shaping that extends at least partially in the circumferential direction around a center, such as, for example, the main body neck. In this case, the profile is preferably arranged in the base body. Due to the design according to the invention structurally simple, a spring element can be integrated into the protection device, which absorbs energy in strikes of fragments in a main body wall inner wall.

A conceivable further development is that the absorption element is designed to be multi-walled, whereby structurally simply more wall material is present, which can be deformed and thus absorbs more energy. In this context, by "multi-walled" in particular a version with more than one wall to be understood. Furthermore, it is advantageous if at least two walls are provided, between which a cavity is formed.

It is also conceivable that a filling component is introduced between an inner and an outer wall of the absorption element. A "filling component" is to be understood here in particular as a component of an energy-absorbing material, such as a foam and / or an elastomer. By introducing a filling component, such as the foam, a particularly simple, flexible and inexpensive additional absorption element can be provided. In addition, foam has a sound-absorbing effect, which additionally advantageous noises of the power tool can be reduced. In principle, however, other energy-absorbing filling components that appear appropriate to the person skilled in the art are also conceivable.

In addition, it is conceivable that the protective device has a multi-part body neck, which structurally simple, an absorption element can be installed in the main body neck.

Furthermore, it is conceivable if at least one rubber-elastic component is provided, which is arranged on the main body neck. The term "rubber-elastic component" is to be understood here in particular as a component that absorbs energy under a reversible deformation and free again, wherein the deformation is preferably greater than 2% of a component thickness. The rubber-elastic component may be cohesively arranged on the main body neck. By integrating the rubber-elastic component shocks can be attenuated or absorbed on the protection device. Further, a relative movement of an inner ring of the protective device or the main body neck relative to a mounting flange of the protective device can be minimized by damping vibrations that occur in a normal operation of the power tool, whereby wear can be reduced.

drawing

Further advantages emerge from the following description of the drawing. In the drawings, embodiments of the invention are shown, and protective devices that do not belong to the invention.

Fig. 1

eine Handwerkzeugmaschine mit einer Schutzvorrichtung in einer schematischen Darstellung zur Erläuterung der Funktion der Erfindung,

Fig. 2

die Schutzvorrichtung aus Figur 1 in einer perspektivischen Sicht von oben,

Fig. 3

eine alternative, nicht erfindungsgemäße Schutzvorrichtung mit einem sich verjüngenden Absorptionselementenprofil in einer perspektivischen Sicht von oben,

Fig. 4

eine weitere alternative, nicht erfindungsgemäße Schutzvorrichtung mit einem in einer Grundkörperwand angeordneten Absorptionselement in einer perspektivischen Sicht von oben,

Fig. 5

einen parallel zu einem Grundkörper verlaufenden Schnitt durch eine Grundkörperwand mit einem Sägezahnprofil einer erfindungsgemäßen Schutzvorrichtung,

Fig. 6

einen parallel zu einem Grundkörper verlaufenden Schnitt durch eine Grundkörperwand mit einem alternativen Sägezahnprofil einer alternativen erfindungsgemäßen Schutzvorrichtung,

Fig. 7

einen parallel zu einem Grundkörper verlaufenden Schnitt durch eine Grundkörperwand mit einem Wellenprofil einer alternativen erfindungsgemäßen Schutzvorrichtung,

Fig. 8

eine weitere alternative, nicht erfindungsgemäße Schutzvorrichtung mit einem in einem Grundkörper angeordneten Absorptionselement in einer perspektivischen Sicht von oben,

Fig. 9

eine weitere alternative, nicht erfindungsgemäße Schutzvorrichtung mit einem in einer doppelwandig ausgeführten Grundkörperwand in einer perspektivischen Sicht von oben

Fig. 10

eine weitere alternative, nicht erfindungsgemäße Schutzvorrichtung mit einem mehrteilig ausgeführten Grundkörperhals und einem daran angeordneten Absorptionselement in einer perspektivischen Sicht von oben und

Fig. 1 1

einen parallel zu einem Grundkörper verlaufenden Schnitt durch einen Grundkörperhals mit einer Spannvorrichtung einer alternativen, nicht erfindungsgemäßen Schutzvorrichtung.

Show it:

Fig. 1

a hand tool with a protective device in a schematic representation for explaining the function of the invention,

Fig. 2

the protection device FIG. 1 in a perspective view from above,

Fig. 3

an alternative, non-inventive protection device with a tapered Absorptionselementenprofil in a perspective view from above,

Fig. 4

a further alternative, non-inventive protection device with an arranged in a base body wall absorption element in a perspective view from above,

Fig. 5

a parallel to a main body extending section through a main body wall with a sawtooth profile of a protective device according to the invention,

Fig. 6

a parallel to a main body extending section through a main body wall with an alternative sawtooth profile of an alternative protective device according to the invention,

Fig. 7

a parallel to a main body extending section through a main body wall with a wave profile of an alternative protection device according to the invention,

Fig. 8

a further alternative, non-inventive protective device with an arranged in a base body absorption element in a perspective view from above,

Fig. 9

a further alternative, non-inventive protection device with a executed in a double-walled base body wall in a perspective view from above

Fig. 10

a further alternative, non-inventive protection device with a multipart base body neck and an absorbent element arranged thereon in a perspective view from above and

Fig. 1 1

a parallel to a main body extending section through a main body neck with a tensioning device of an alternative, non-inventive protection device.

Description of the embodiments

In FIG. 1 For purposes of explanation and understanding of the present invention, a hand tool 12a formed by an angle grinder is shown in a top view. The angle grinder comprises a housing 60a and a main handle 62a integrated in the housing 60a. At a front of a tool 14a, which is formed by a cutting disc, facing portion 64a of the angle grinder, a tool holder 66a is arranged on which a protective device 10a, namely a protective hood with a main body unit 16a is arranged.

The main body unit 16a serves to protect an operator of the handheld power tool 12a from sparks and material particles and to protect against broken pieces of the tool 14a, which may result from damage such as bursting of the tool 14a during operation of the handheld power tool 12a. The protective device 10a or the basic body unit 16a is composed of a plurality of main body means 24a and comprises a half-disk-shaped main body 68a and a main body wall 70a, which is transverse to a main extension surface 72a of the base body 68a is arranged and radially surrounds a tool 14a. In this case, the main body wall 70a is arranged on a side 74a facing the tool 14a. Furthermore, the The basic body unit 16a has a main body collar 76a which is arranged transversely to an extension surface 78a of the main body wall 70a on a side 80a of the main body wall 70a facing away from the main body 68a, parallel to the main body 68a and extends radially inwardly from the main body wall 70a. Furthermore, a main body neck 56a is arranged on the main body 68a, which extends transversely to a main extension surface 72a of the main body 68a and is aligned parallel to the main body wall 70a. In this case, the main body neck 56a is arranged on a side 82a facing away from the tool 14a.

As in FIG. 2 1, the semicircular base body unit 16a has an absorption element 18a provided for deformation, which is arranged in a base body means 24a designed as the base body 68a. Further, the steel main body unit 16a covers an angular range of 180 ° of the tool 14a (FIG. FIG. 1 ). In principle, however, other materials which appear appropriate to the person skilled in the art and which have sufficient strength and hardness, such as, for example, a carbon fiber construction, are conceivable for forming the basic body unit 16a.

The absorption element 18a has a profiling 20a for receiving kinetic energy. For this purpose, the profiling 20a constitutes a recess 26a in the form of a longitudinal opening 28a, which is arranged along a direction 30a of the main body unit 16a pointing in a substantially radially outward direction. The recess 26a or the longitudinal opening 28a is arranged in a partial region 22a of the main body means 24a or of the main body 68a of the main body unit 16a, which extends from an edge 84a which extends in the radial direction of the main body 68a along a circumferential direction 86a to approximately one Third extends over the main extension surface 72a of the body 68a. Furthermore, the partial region 22a has further longitudinal openings 28a, which extend in the circumferential direction 86a one behind the other over the main body 68a. Here, the longitudinal openings 28a are arranged radially around a center, such as the main body neck 56a. The longitudinal openings 28a extend radially outward from an imaginary center 88a of the main body neck 56a to different points 90a of the pitch circle circumference 92a of the main body 68a, the points 90a being arranged one after the other in the circumferential direction 86a. Furthermore, the recesses 26a and the longitudinal openings 28a differ with respect to their shapes and / or their length. A longitudinal opening 94a, which is arranged in a region of the partial region 22a pointing to the edge 84a, is approximately half as long as a longitudinal opening 96a, which is placed in the circumferential direction 86a immediately after the longitudinal opening 94a. Longitudinal openings 94a and longitudinal openings 96a are arranged in the circumferential direction 86a alternately to one another. The longitudinal opening 94a has an approximately 30 times as long longitudinal extent 98a opposite to an extension in its width 100a.

In the FIGS. 3, 4 and 8 to 11 FIG. 2 shows alternative embodiments of the protective device 10a for a better understanding of the invention, wherein FIG FIGS. 5 to 7 Protection devices 10d-f according to the invention are shown. Essentially, the same components, features and functions are always numbered the same. To distinguish the embodiments, however, the reference numerals of the embodiments, the letters a to i and k are added. The following description is essentially limited to the differences from the embodiment in the FIG. 2 , wherein with respect to the same components, features and functions on the description of the embodiment in the FIG. 2 can be referenced.

In FIG. 3 For example, FIG. 3 shows a protective device 10b that is alternative to the protective device 10a, having a main body unit 16b that has a main body 68b, a main body wall 70b, a main body collar 76b and a main body neck 56b for a better understanding of the invention. In this case, the semicircular base body unit 16b has an absorption element 18b provided for deformation, which is arranged in the base body 68b. The absorption element 18b has a profiling 20b in the form of a recess 26b or a longitudinal opening 28b, which is arranged along a direction 30b of the main body unit 16b pointing essentially radially outward. There are further longitudinal openings 28b arranged in a partial region 22b, which extend in a circumferential direction 86b in succession over the main body 68b. In this case, the longitudinal openings 28b are arranged radially around a center, such as the main body neck 56b. In order to minimize the burden of a protective device fastening at the moment of impact of a fragment of a bursting tool and to make the fastening component wear-resistant, the partial region 22b of the basic body unit 16b comprises two partial regions 32b and 34b which have specifically differing absorption properties. The partial region 32b is arranged in a region of the partial region 22b facing the edge 84a and the partial region 34b in a region facing away from the edge 84b or in a region which is located substantially centrally between the edge 84b and a second radially extending edge 102b , A longitudinal opening 94b, which is arranged in the partial area 32b, has a longer longitudinal extent 98b than a longitudinal opening 104b arranged in the partial area 34b. The longitudinal openings 28b in an intermediate region 106b between the longitudinal opening 94b and the longitudinal opening 104b shorten in their longitudinal extent 98b in Direction of the circumferential direction 86b, starting from the edge 84b toward an axis of symmetry 108b of the body 68b, gradually by about 10% to 50% of a length of each longitudinal opening 28b previously arranged in the circumferential direction 86b. This shares the

Symmetryeachse 108b the main body 68b in two nearly equal parts. In order to achieve a particularly homogeneous deformation and thus efficient energy absorption, the absorption element 18b is arranged in two base body means 24b, namely the base body 68b and the base body wall 70b designed as a radial wall 40b, or the longitudinal openings 28b extend over a plurality of base body means 24b. However, it would also be conceivable for the absorption element 18b to be arranged in two other and / or in at least three base body means 24b, such as the base body 68b, the base body wall 70b and / or the base body collar 76b.

FIG. 4 For better understanding of the invention, an alternative protective device 10c to the protective device 10a is shown, comprising a main body unit 16c, which has a main body 68c, a main body wall 70c, a main body collar 76c and a main body neck 56c. In this case, the semicircular base body unit 16c has two walls 36c, 38c with different wall thicknesses, wherein one of the walls 36c, 38c represents a radial wall 40c. The radial wall 40c is designed as a base body wall 70c and forms the absorption element 18c provided for deformation. The radial wall 40c or the absorption element 18c has a thickness 110c which is thinner than a thickness 112c of the wall 38c, which represents a wall of the main body 68c and / or of the main body collar 76c.

FIG. 5 shows a protective device according to the invention 10d in a plan view of a parallel to a base body not shown here section through a main body wall 70d of a basic body unit 16d. In the main body wall 70d, which constitutes a radial wall 40d, an absorption element 18d, which has a partial region 42d with a sawtooth profile 44d, is arranged. The sawtooth profile 44d extends in the circumferential direction 86d along an outer side 114d of the main body wall 70d, which is arranged on a side facing away from a tool, not shown here side of the main body wall 70d and the main body 76d and 76d extends along an inner side 116d, which at one Tool facing side is arranged. As a result of an arrangement of alternately arranged flank regions 118d, 120d in the sawtooth profile 44d, the base body means 24d of the base body unit 16d, namely the base body wall 70d, have different wall thicknesses. The flank region 118d has a thickness 122d formed by a wall thickness which is thicker than a thickness 124d of the flank region 120d. A major extension of the flank region 118d extends substantially along the circumferential direction 86d and extends in a rotational direction of the tool, not shown here, which runs parallel to the circumferential direction 86d. On the other hand, extends the Flank region 120d substantially in the radial direction 30d. Due to this flank orientation is the sawtooth profile 44d oriented counter to a rotational direction of the tool, which is structurally simple prevents sparks resulting from the impact of fragments and / or the fragments themselves can leave the protective device. The sawtooth profile 44d is introduced into the outside 114d and the inside 116d of the main body wall by means of embossing, but it is also conceivable to make another insertion that would appear meaningful to a person skilled in the art.

FIG. 6 shows an alternative protection device according to the invention 10e in a plan view of a parallel to a base body not shown here section through a main body wall 70e of a basic body unit 16e. In the main body wall 70e, which is a radial wall 40e, an absorption element 18e, which has a partial region 42e with a sawtooth profile 44e, is arranged. The sawtooth profile 44e extends in the circumferential direction 86e along an outer side 114e and along an inner side 116e of the main body wall 70e and is introduced by means of a punching process into the outer side 114e of the main body wall. By an arrangement of alternately arranged flank regions 118e, 120e in the sawtooth profile 44e, the main body wall 70e has different wall thicknesses. The flank region 118e represents a lamination 126e which is flanked in the circumferential direction 86e by two flank regions 120e in the form of two punched openings 128e. The blade 126e extends substantially along the circumferential direction 86e and extends in a rotational direction of the tool. The punch opening 128e spaces two blades in the radial direction 30e, with the blades 126e abutting each other at their end portions. However, it would also be conceivable to enlarge the punched openings by rotating the slats 126e in their respective axis of rotation 130e, so that air can be sucked from outside into the protective device 10e by a rotation of the tool, not shown, which cools sparks in the protective device 10e and thus a Sparks reduced.

FIG. 7 shows an alternative protection device according to the invention 10f in a plan view of a parallel to a basic body not shown here section through a main body wall 70f of a basic body unit 16f. In the main body wall 70f, which is a radial wall 40f, an absorbent member 18f having a portion 42f with a corrugated profile 46f is disposed. The corrugation profile 46f extends in the peripheral direction 86f along an outer side 114f and along an inner side 116f of the main body wall 70f. As a result of an arrangement of alternately arranged flank regions 118f and 120f in the corrugated profile 46f, the main body wall 70f has different wall thicknesses. The flank area 118f has a thickness 122f that is thicker than a thickness 124f of the flank area 120f. The major extensions of the flank regions 118f, 120f extend substantially along the circumferential direction 86f and ers stretches in a direction of rotation of the tool not shown here. The flank region 118f points from a wave crest 132f to a waveguide 134f previously arranged in the circumferential direction 86f, and the flank region 120f points from a wave valley 134f to a wave crest 132f following in the circumferential direction 86f. In principle, the wall thickness of the entire wave profile 46f can also be of the same thickness.

In FIG. 8 For better understanding of the invention, an alternative protective device 10g to the protective device 10a is shown with a main body unit 16g having a main body 68g, a main body wall 70g, a main body collar 76g and a main body neck 56g. In this case, the semicircular base body unit 16g has an absorption element 18g provided for deformation, which is arranged in the base body 68g and a concentric profile 48g, which extends in the circumferential direction 86g around the main body neck 56g. The concentric profile 48g is an additional damping or spring element and is composed of three wave crests 136g and valleys 138g, which are arranged in the radial direction 30g from the main body neck 56g to the pitch circle circumference 92g in succession.

FIG. 9 For better understanding of the invention, an alternative protective device 10h to the protective device 10a is shown with a main body unit 16h having a main body 68h, a main body wall 70h, a main body collar 76h and a main body neck 56h. In this case, the main body wall 70h and / or the main body collar 76h constitutes part of an absorption element 18h, which has a multi-walled construction. The main body wall 70h forms an outer wall 52h of the absorption element 18h, which is arranged substantially parallel to an inner wall 50h of the absorption element 18h. The inner wall 50h is arranged transversely to a main extension surface 72h of the main body 68a and constitutes a wall extending in the circumferential direction 86h around a portion of a tool, not shown, facing the latter. A thickness 140h of the inner wall 50h is thinner than a thickness 142h of the outer wall 52h , The inner wall 50h and the outer wall 52h include in the radial direction 30h a cavity 144h in which a filling component 54h in the form of a foam is introduced. Here, a foam defines a solid containing gaseous inclusions, such as gaseous bubbles in particular. In principle, an embodiment without filling component would also be conceivable.

In FIG. 10 For better understanding of the invention, an alternative protective device 10i to the protective device 10a is provided with a basic body unit 16i which has a main body 68i, a Main body wall 70i, a base body 76i, a main body neck 56i and a base member 146i has shown. Here, the semicircular design Basic body unit 16i a multi-part main body neck 56i, consisting of an outer ring 148i, an inner ring 150i and the base member 146i, on. The body member 146i is configured as a rubber elastic member 58i disposed on the body neck 56i between the outer 148i and the inner ring 150i. The inner ring 150i is frictionally arranged on a flange, not shown, of the angle grinder.

FIG. 11 shows for better understanding of the invention, an alternative to the protective device 10a construction of a protective device 10k with a base member 146k and a clamping device 152k. In this case, a circular segment-shaped rubber-elastic component 58k is arranged between an outer ring 148k and an inner ring 150k of a main body neck 56k of the main body unit 16k. The inner ring 150k has a clamping device 152k with a clamping region 154k, by means of which the protective device 10k is frictionally secured via a clamping element 156k, such as a screw, to a flange, not shown, of an angle grinder.

Claims (2)

1. Protective device for a portable power tool (12a-k) for a rotating, preferably disc-shaped, tool (14a-k), in particular for an angle grinder, comprising at least one basic body unit (16a-k), wherein the basic body unit (16a-k) has at least one half-disc-shaped basic body (68a-c; 68g-i) and a basic body wall (70a-i), arranged transversely to a main extension surface of the basic body (68a-c; 68g-i) and radially surrounding the tool (14a-k), and an absorption element (18a-k) provided for deformation, wherein the basic body unit (16a-k) comprises at least two sections (32a, 34a; 32b, 34b; 32c, 34c; 32d, 34d; 32e, 34e; 32f, 34f; 32g, 34g; 32h, 34h; 32i, 34i; 32k, 34k) which have specifically differing absorption properties, wherein the absorption element (18a-h) has profiling (20a-h) for absorbing kinetic energy, characterized in that the basic body wall (70a-i) has the profiling (20a-h), wherein the absorption element (18d-f) has at least one section (42d-f) having a saw tooth profile (44d; 44e) and/or a corrugated profile (46f), wherein the saw tooth profile (44d; 44e) and/or the corrugated profile (46f) extends in the circumferential direction (86d-f) along an outer side (114d-f) of the basic body wall (70d-f), which is arranged on a side of the basic body wall (70d-f) facing away from the tool, and extends along an inner side (116d-f) of the basic body wall (70d-f), which is arranged on a side of the basic body wall (70d-f) facing the tool, and with at least one radial wall (40d-f) of the basic body unit (16d-f), said radial wall (40d-f) at least partly forming the absorption element (18d-f).
2. Protective device according to Claim 1, characterized by at least one basic body means (24d-f) of the basic body unit (16d-f), said basic body means (24d-f) having different wall thicknesses.

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