EP2032308B1 - Protective hood fastening device - Google Patents

Abstract

The invention is based on a protective hood fastening device having a fastening element (12a - 12n) for fastening a protective hood (14a - 14n) which is intended for partly enclosing a rotating application tool on a body (16a - 16n) of an electric tool (10a - 10n). It is proposed that the fastening element (12a - 12n) comprise at least one latching element (18a - 18n) for locking the protective hood (14a - 14n) against rotation relative to the body (16a - 16n) of the electric tool (10a - 10n).

Description

State of the art

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

There is known a protective hood fastening device with a fastening element for fastening a protective hood to a body of a power tool, wherein the protective hood is intended to partially surround a rotating insert tool. The fastening element is designed as a loop and connects a fixed spindle neck of the power tool frictionally with a guard spindle stub, when the loop is clamped, for example by means of an operable by an Allen key tensioning device to the two spindle stub around.

From the publication DE 39 13 898 A1 a protective hood fastening device for an angle grinder is known. The angle grinder comprises a work spindle, a clamping flange with a clamping nut, a disk-shaped machining tool, a protective hood, which comprises the machining tool, a handle and a lever-like handling element for actuating a rotary closure of the protective hood. The lever-like handling element serves to adjust and secure the protective cover in the circumferential direction. For axial securing of the guard is a locking collar attached to the clamping neck.

From the publication DE 103 43 060 A1 An angle grinder is known which comprises a grinding wheel attachable to an output shaft. The grinding wheel is surrounded by a protective cover. At the end of a gear housing of the angle grinder is a bearing flange with a top emerging cylindrical neck, which receives the guard on its outer circumference. In the cylindrical neck grooves are recessed, which are associated with corresponding radial cam in the guard. By means of a bayonet-like closure, the protective cover can be secured axially. About a lever-like handling element, the guard is secured by locking cams, which engage in detent openings in the collar of the guard in the circumferential direction.

Advantages of the invention

The invention relates to a protective hood fastening device with a fastening element for fastening a Protective hood on a body of a power tool, wherein the protective hood is intended to partially surround a rotating insert tool, wherein the fastening element comprises at least one latching element for securing the protective cover against rotation relative to the body of the power tool, with at least one handling element for manually releasing one of the Locking element generated latching connection between the body of the power tool and the guard.

There are proposed two substantially mirror-symmetrical locking elements, wherein each of the locking elements is associated with a lever-like handling element.

The term "handling element" is used in this context as a generic term for manually operable mounting elements, in particular levers and knobs. By the handling element for manually releasing the locking connection generated by the locking element between the body of the power tool and the protective cover a tool-free installation or adjustment of the protective cover can be made possible. By two substantially mirror-symmetrical locking elements, in particular a redundant rotation of the guard against the body of the power tool and thus preferably increased security can be achieved.

A structurally simple power transmission of easily accessible areas in less accessible areas and an advantageous translation of the force of the operator according to the leverage laws can be achieved if the handling element is designed as a lever or at least a lever-like Extension has. If the protective hood mounting device comprises a spindle socket fastened to the body of the power tool for radial and axial securing of the protective cover and particularly advantageously a protective hood spindle socket which is provided for producing a plug connection with the spindle socket of the electric tool, a structurally simple and robust radial securing can be made possible ,

The pivoting or rotation of the guard is not affected, when the guard-spindle nozzle and the spindle nozzle corresponding, cylinder jacket-shaped surfaces which are suitable for producing a radially secured, rotatable connector between the guard-spindle nozzle and the spindle neck.

A robust, dust-insensitive and cost-effective rotation can be made possible when the locking element is designed as a locking cam.

Further cost savings can be achieved by simplifying the assembly and by reducing a variety of components when the locking element is formed integrally with the handling element, particularly advantageous as a plastic injection molded part.

An increased security by a redundant rotation can be ensured by at least two locking elements for securing the guard against rotation relative to the body of the power tool.

This is especially true when each of the locking elements is associated with a handling element, by which a detent connection generated by the locking element is manually releasable. A due to this doubling complication of the operation can be avoided if the two handling elements or the two points of attack of the handling elements are arranged directly adjacent to each other, so that an actuation both handling elements with only one finger is made possible.

Alternatively, the two handling elements may be disposed on opposite sides of the body of the power tool and have an opposite direction of actuation so that one-handed operation is possible through the thumb and forefinger or through the thumb and middle finger.

An axial securing can be achieved structurally simple by a Hintergreifung for axially securing the protective cover on the body of the power tool.

If the guard fastening device comprises a spring element for loading the handling element in the direction of a latching position, inadvertent release of the latching element or the latching connection generated by the latching element can be avoided.

A robust rotation lock can furthermore be realized in that the latching element comprises at least one eccentric cam for producing the latching connection between the protective hood and the body of the power tool.

A particularly high level of security against rotation can be ensured by the latching element having a toothing which corresponds to a corresponding toothing of the protective hood.

If the handling element is mounted pivotably about a pivot axis on the body of the power tool, a structurally simple, dust-insensitive storage and support is ensured.

It can be made possible a space-saving extension of an associated lever in the circumferential direction, when the pivot axis extends at least substantially parallel to a rotational axis of the insert tool. In this context, an arrangement in which the directions of the axes deviate from one another by less than 10 ° -20 ° should also be regarded as "essentially parallel".

Alternatively, it is proposed that the pivot axis has an angle to a rotation axis of the insertion tool. As a result, an adapted to the structural conditions movement space of the handling element can be made possible.

In this case, a latching direction of the handling element or of the latching element extending transversely to a direction of rotation of the insertion tool, in particular of a cutting disk, can be made possible in particular if the pivot axis extends at least substantially perpendicular to a rotation axis of the insertion tool.

Because of the danger of bursting of the insertion tool, which is particularly great in connection with this power tool, an improvement of the operational safety achieved by the protective cover fastening device according to the invention is achieved especially when the power tool is designed as an angle grinder.

Furthermore, the invention relates to a protective hood, which cooperates with the protective cover fastening device already described, for attachment to a body of a power tool and for at least partial radial encircling a usable in the power tool, rotating insert tool, with a locking recess for securing the guard against rotation relative to the Body of the power tool.

It is proposed that the protective hood has a multiplicity of latching recesses which are each assigned to a rotary position of the protective hood relative to the body. Particularly advantageously, the guard has a regular sequence of recesses with equal intervals, which can also form a periodically extending in the circumferential direction of the guard or the guard spindle stub teeth.

Further advantages emerge from the following description of the drawing. In the drawings, embodiments of the invention are shown. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

Fig. 1

einen Ausschnitt eines Winkelschleifers mit einer Schutzhauben-Befestigungsvorrichtung mit einem Rastelement nach einem ersten Ausfüh- rungsbeispiel der Erfindung,

Fig. 2

den Ausschnitt aus Figur 1 in einer Seitenan- sicht mit einer Schutzhaube,

Fig. 3

den Ausschnitt aus Figur 1 mit gelöstem Rast- element,

Fig. 4

einen Ausschnitt eines Winkelschleifers mit einer Schutzhauben-Befestigungsvorrichtung mit zwei Rastelementen nach einem zweiten Ausfüh- rungsbeispiel der Erfindung,

Fig. 5

den Ausschnitt aus Figur 4 in einer Seitenan- sicht mit einer Schutzhaube,

Fig. 6

den Ausschnitt aus Figur 4 mit gelösten Rast- elementen,

Fig. 7

einen Ausschnitt eines Winkelschleifers mit einer Schutzhauben-Befestigungsvorrichtung mit einem Rastelement und mit einem besonders lan- gen Handhabungselement nach einem dritten Aus- führungsbeispiel der Erfindung,

Fig. 8

einen Ausschnitt eines Winkelschleifers mit einer Schutzhauben-Befestigungsvorrichtung mit einem Rastelement nach einem vierten Ausfüh- rungsbeispiel der Erfindung,

Fig. 9

den Ausschnitt aus Figur 8 in einer Seitenan- sicht mit einer Schutzhaube,

Fig. 10

den Ausschnitt aus Figur 8 mit gelöstem Rast- element,

Fig. 11

einen Ausschnitt eines Winkelschleifers mit einer Schutzhauben-Befestigungsvorrichtung mit einem Rastelement nach einem fünften Ausfüh- rungsbeispiel der Erfindung,

Fig. 12

einen Ausschnitt eines Winkelschleifers mit einer Schutzhauben-Befestigungsvorrichtung mit einem als Exzenternocken ausgebildeten Rast- element nach einem sechsten Ausführungsbei- spiel der Erfindung,

Fig. 13

den Ausschnitt aus Figur 12 in einer Seitenan- sicht mit einer Schutzhaube,

Fig. 14

den Ausschnitt aus Figur 12 mit gelöstem Rast- element,

Fig. 15

einen Ausschnitt eines Winkelschleifers mit einer Schutzhauben-Befestigungsvorrichtung mit einem Rastelement nach einem siebten Ausfüh- rungsbeispiel der Erfindung,

Fig. 16

einen Ausschnitt eines Winkelschleifers mit einer Schutzhauben-Befestigungsvorrichtung mit einem Rastelement und einem Gleitelement nach einem achten Ausführungsbeispiel der Erfin- dung,

Fig. 17.

einen Ausschnitt eines Winkelschleifers mit einer Schutzhauben-Befestigungsvorrichtung mit einem Rastelement nach einem neunten Ausfüh- rungsbeispiel der Erfindung,

Fig. 18

den Ausschnitt aus Figur 17 mit gelöstem Rast- element,

Fig. 19

einen Ausschnitt eines Winkelschleifers mit einer Schutzhauben-Befestigungsvorrichtung mit einem geradlinig verschiebbaren Handhabungs-

Fig. 20

element nach einem zehnten Ausführungsbeispiel der Erfindung, den Ausschnitt aus Figur 19 in einer Seitenan- sicht mit einer Schutzhaube,

Fig. 21

den Ausschnitt aus Figur 19 mit gelöstem Rast- element,

Fig. 22

einen Ausschnitt eines Winkelschleifers mit einer Schutzhauben-Befestigungsvorrichtung mit einem Rastelement nach einem elften Ausfüh- rungsbeispiel der Erfindung,

Fig. 23

den Ausschnitt aus Figur 22 in einer Seitenan- sicht mit einer Schutzhaube,

Fig. 24

den Ausschnitt aus Figur 22 mit gelöstem Rast- element,

Fig. 25

einen Ausschnitt eines Winkelschleifers mit einer Schutzhauben-Befestigungsvorrichtung mit einem Rastelement nach einem zwölften Ausfüh- rungsbeispiel der Erfindung,

Fig. 26

den Ausschnitt aus Figur 25 in einer Seitenan- sicht mit einer Schutzhaube,

Fig. 27

den Ausschnitt aus Figur 25 mit gelöstem Rast- element,

Fig. 28

einen Ausschnitt eines Winkelschleifers mit einer Schutzhauben-Befestigungsvorrichtung mit einem Rastelement nach einem dreizehnten Aus- führungsbeispiel der Erfindung,

Fig. 29

den Ausschnitt aus Figur 28 in einer Seitenan- sicht mit einer Schutzhaube,

Fig. 30

den Ausschnitt aus Figur 28 mit gelöstem Rast- element,

Fig. 31

einen Ausschnitt eines Winkelschleifers mit einer Schutzhauben-Befestigungsvorrichtung mit einem Rastelement nach einem vierzehnten Aus- führungsbeispiel der Erfindung und

Fig. 32

den Ausschnitt aus Figur 31 mit einem Aus- schnitt einer Schutzhaube in einer Explosions- darstellung.

Show it:

Fig. 1

4 a detail of an angle grinder with a protective cover fastening device with a latching element according to a first exemplary embodiment of the invention,

Fig. 2

the cutout FIG. 1 in a side view with a protective hood,

Fig. 3

the cutout FIG. 1 with released locking element,

Fig. 4

4 a detail of an angle grinder with a protective cover fastening device with two latching elements according to a second embodiment of the invention,

Fig. 5

the cutout FIG. 4 in a side view with a protective hood,

Fig. 6

the cutout FIG. 4 with released locking elements,

Fig. 7

4 a detail of an angle grinder with a protective cover fastening device with a latching element and with a particularly long handling element according to a third exemplary embodiment of the invention,

Fig. 8

4 a detail of an angle grinder with a protective cover fastening device with a latching element according to a fourth exemplary embodiment of the invention,

Fig. 9

the cutout FIG. 8 in a side view with a protective hood,

Fig. 10

the cutout FIG. 8 with released locking element,

Fig. 11

4 a detail of an angle grinder with a protective cover fastening device with a latching element according to a fifth exemplary embodiment of the invention,

Fig. 12

4 a detail of an angle grinder with a protective cover fixing device with a locking element formed as an eccentric cam according to a sixth embodiment of the invention,

Fig. 13

the cutout FIG. 12 in a side view with a protective hood,

Fig. 14

the cutout FIG. 12 with released locking element,

Fig. 15

4 a detail of an angle grinder with a protective cover fastening device with a latching element according to a seventh exemplary embodiment of the invention,

Fig. 16

4 a detail of an angle grinder with a guard fastening device with a latching element and a sliding element according to an eighth embodiment of the invention,

Fig. 17.

4 a detail of an angle grinder with a protective cover fastening device with a latching element according to a ninth exemplary embodiment of the invention,

Fig. 18

the cutout FIG. 17 with released locking element,

Fig. 19

a section of an angle grinder with a protective cover fastening device with a straight-line sliding handling

Fig. 20

element according to a tenth embodiment of the invention, the neck of FIG. 19 in a side view with a protective hood,

Fig. 21

the cutout FIG. 19 with released locking element,

Fig. 22

4 a detail of an angle grinder with a protective cover fastening device with a latching element according to an eleventh exemplary embodiment of the invention,

Fig. 23

the cutout FIG. 22 in a side view with a protective hood,

Fig. 24

the cutout FIG. 22 with released locking element,

Fig. 25

4 a detail of an angle grinder with a protective cover fastening device with a latching element according to a twelfth exemplary embodiment of the invention,

Fig. 26

the cutout FIG. 25 in a side view with a protective hood,

Fig. 27

the cutout FIG. 25 with released locking element,

Fig. 28

a detail of an angle grinder with a protective cover fastening device with a latching element according to a thirteenth exemplary embodiment of the invention,

Fig. 29

the cutout FIG. 28 in a side view with a protective hood,

Fig. 30

the cutout FIG. 28 with released locking element,

Fig. 31

a section of an angle grinder with a guard fixing device with a locking element according to a fourteenth embodiment of the invention and

Fig. 32

the cutout FIG. 31 with a section of a protective hood in an exploded view.

Description of the embodiments

FIG. 1 shows a protective hood fastening device of a power tool 10a, namely an angle grinder, with a fastening element 12a for attaching a protective hood 14a to a body 16a of the electric tool 10a. The protective hood 14a is provided by its shape or adapted to partially surround a rotating insert tool (not shown) in the radial direction and in the circumferential direction. In the peripheral region, in which the protective cover 14a, which is segmented in an axial plan view, covers the insertion tool, which in the present embodiment is designed as a cutting disc, the protective cover 14a engages around a radially outer cutting edge of the insertion tool by means of a U-shaped profile.

The protective hood 14a protects an operator from injuries which may occur due to parts which fly radially, in particular in the event of a rupture of the insertion tool. Furthermore, the protective cover 14a shields sparks which may arise when working with the power tool 10a.

In order to enable a power tool 10a with a protective cover 14a which is easy to fasten and release or adaptable in its rotational position, the fastening element 12a comprises at least one locking element 18a for securing the protective cover 14a against rotation relative to the body 16a of the power tool 10a.

Tool-free installation or adjustment of the protective hood 14a is made possible by the fact that the protective hood fastening device has a handling element 20a for manually releasing a locking connection generated by the latching element 18a between the body 16a of the electric tool 10a and the protective hood 14a, the handling element 20a acting as a lever is formed or has two lever-like extensions.

For radial securing of the protective hood 14a, the protective hood fastening device has a spindle nozzle 22a fastened to the body 16a of the electric tool 10a and a guard spindle nozzle 24a, which is provided for producing a plug connection with the spindle nozzle 22a of the electric tool 10a.

A Hintergreifung the guard spindle nozzle 24a not shown here is used for axially securing the guard 14a on the body 16a of the power tool 10a. The Hintergreifung has openings for attaching the guard-spindle nozzle 24a on the tool-side spindle nozzle 22a and the tool-side spindle nozzle 22a has corresponding apertures, so that a Plugging only in certain, defined by the openings relative rotational positions is possible.

In addition, the protective hood spindle nozzle 24a and the spindle nozzle 22a have corresponding, cylinder jacket-shaped surfaces which are suitable for producing a radially secured, rotatable plug connection between the protective hood spindle nozzle 24a and the spindle nozzle 22a.

The latching element 18a is integrally formed as a plastic injection molded part at one end of one of the lever arms of the handling element 20a and formed as a locking cam. Alternatively, the latching element 18a could be formed, for example, as an aluminum die-cast or stamped part.

A spring element 26a, which is formed in the present embodiment as a compression spring, is used to load the handling element 20a in the direction of a latching position.

The handling element 20a is mounted pivotably about a pivot axis 28a on the body 16a of the power tool 10a, the pivot axis 28a being parallel to a rotation axis 30a of the insertion tool. In the present embodiment, the pivot axis 28a coincides with a central axis of a screw 32a, with which the machine-side spindle socket 22a is screwed to a housing of the power tool 10a designed as an angle grinder. In other conceivable embodiments of the invention, the pivot axis 28a and the central axis of the screw 32a fall apart.

FIG. 2 shows the section FIG. 1 in a side view with attached protective hood 14a. The protective hood 14a has on the guard spindle nozzle 24a a plurality of recesses 34a, which in the Figures 1 and 2 can be seen and each associated with a rotational position of the protective hood 14a relative to the body 16a.

FIG. 3 shows the section FIG. 1 with dissolved or unlocked latching element 18a. An operator can unlock the latching element 18a by exerting a radially inwardly acting pressure on an engagement region 36a of the handling element 20a in the area of the spring element 26a, which overcompensates a restoring force of the radially outwardly acting spring element 26a. The latching element 18a and the engagement region 36a are arranged at opposite ends of the curved handling element 20a extending over approximately one third of the circumference of the spindle nozzle 22a, wherein the pivot axis 28a of the handling element 20a lies in a central region thereof between the latching element 18a and the engagement region 36a located. By pressing in the engagement region 36a of the handling element 20a radially inward, therefore, the detent element 18a moves radially outwards.

If the latching element 18a is unlocked, the protective hood spindle nozzle 24a and the spindle nozzle 22a or the protective hood 14a and the electric tool 10a can be rotated against each other, wherein the corresponding cylinder jacket-shaped surfaces slide over each other and cause the resulting rotational movement. The latching element 18a also slides over one of the lateral surfaces until a latching recess 34a reaches is, in which the locking element 18a, driven by the restoring force of the spring element 26a, engages.

The FIGS. 4 to 32 show further embodiments of the invention. In the description of these figures is essentially based on differences from those in the Figures 1 - 3 illustrated embodiment, while with regard to the same features on the description of the Figures 1 - 3 is referenced. Features having the same effect are provided with the same reference numerals, with the letters a-m being added to distinguish the exemplary embodiments.

The FIGS. 4 to 6 show a section of an angle grinder with a protective cover fastening device with two locking elements 18b, 18b 'according to a second embodiment of the invention. The protective cover fastening device comprises two substantially mirror-symmetrical latching elements 18b, 18b 'for securing the protective cover 14b against rotation relative to the body 16b of the electric tool 10b. Each of the latching elements 18b, 18b 'is associated with a lever-like handling element 20b, 20b', by means of which a latching connection generated by the latching element 18b can be released manually, wherein the engagement areas 36b, 36b 'of the two handling elements 20b, 20b' are arranged directly next to one another.

FIG. 6 shows the section FIG. 4 with released locking elements 18b, 18b '. It can be seen that the two latching elements 18b, 18b 'can be released simultaneously by simultaneously pressing the two engagement areas 36b, 36b'. In an alternative embodiment of the invention, here not shown, the engagement portions 36b, 36b 'are arranged radially one above the other, so that upon actuation of the first handling member 20b, the second handling member 20b' is automatically taken.

FIG. 7 shows a section of an angle grinder with a protective cover fastening device with a latching element 18 c according to a third embodiment of the invention. The guard fixing device according to the third embodiment of the invention has a lever-shaped handling member 20c with two lever arms connected via a common pivot axis 28c extending over one half of the circumference of a spindle stub 22c of the guard attachment device, each of the lever arms being about a quarter the circumference of the spindle neck 22c extends.

The FIGS. 8-10 each show a section of an angle grinder with a protective cover fastening device with two locking elements 18d, 18d 'and two handling elements 20d, 20d' according to a fourth embodiment of the invention. The engagement areas 36d, 36d 'of the handling elements 20d, 20d' are offset radially outward and lie in an in FIG. 10 shown unlocking position on a housing 38d of the protective hood fastening device comprising a power tool 10d.

FIG. 11 shows a section of an angle grinder with a guard fastening device with two locking elements 18e, 18e 'and two handling elements 20e, 20e' according to a fifth embodiment of the invention, in which underneath engagement areas 36e, 36e 'of the handling elements 20e, 20e' between the respective handling element 20e, 20e 'and a housing 38e of a protective tool fastening device comprising the electric power tool 10e designed as compression springs spring elements 26e, 26e' are arranged.

The FIGS. 12-14 each show a section of an angle grinder with a protective cover fastening device with a latching element 18f according to a sixth embodiment of the invention. The locking element 18f is formed as an eccentric cam for establishing the latching connection between the protective hood 14f and the body 16f of the electric tool 10f, which can be rotated about a pivot point with a lever arm. The fulcrum is defined by a semi-cylindrical formation 40f on a housing 38f of a power tool 10f comprising the protective cover fixing device, on which a force with which the eccentric cam is inserted into a corresponding recess 34f on the protective cover spindle socket 24f is supported.

FIG. 15 shows a section of an angle grinder with a protective cover fastening device with a locking element 18g according to a seventh embodiment of the invention, which analogous to the sixth embodiment of the invention comprises an eccentric cam, which engages in a detent recess 34g in a guard spindle stub 24g. However, the eccentric cam is formed on two sides, so that the support of the handling element 20g on a housing 38g of a protective hood fastening device comprising Power tool 10g takes place via a cam-shaped curved path.

FIG. 16 shows a section of an angle grinder with a protective cover fastening device with a locking element 18h according to an eighth embodiment of the invention with an analogous to the seventh embodiment, two-sided eccentric cam, which, however, does not engage directly in a recess 34h in a protective hood spindle nozzle 24h, but for locking the Guard 14h a radially movable in the machine-side spindle nozzle 22h mounted sliding member 42h in such a recess 34h pushes into it.

FIG. 17 shows a section of an angle grinder with a guard attachment device with a handling element 20i and a latching element 18i according to a ninth embodiment of the invention.

The handling element 20i comprises a button 54i connected to a shaft 44i for operating the detent device. The handling element 20i is pivotable about a pivot axis 28i defined by the shaft 44i, which has an angle of 90 ° to a rotation axis 30i of the insertion tool and extends substantially tangentially to the spindle neck 22i. On the shaft 44i, a latching element 18i is formed, which can be automatically screwed by a designed as a torsion spring 26i element 26i in a recess 34i in a guard-spindle nozzle 24i. The latching connection can therefore not be solved by very large, acting on the guard 14i torques. FIG. 18 shows the Extract from FIG. 17 with dissolved latching element 18i. In an alternative embodiment, the shaft 44i may be formed as a torsion bar with a restoring spring action, so that a separate spring element 26i may be omitted.

The FIGS. 19-21 show a section of an angle grinder with a protective cover fastening device with a latching element 18j according to a tenth embodiment of the invention. A handling member 20j of the protective cover fixing device according to FIGS FIGS. 19-21 is mounted along its longitudinal direction in a straight line tangential to the spindle 22j slidably mounted on a housing 38j of a power tool 10j. A longitudinal guide of the handling element 20j is designed as a strip sliding element.

The FIGS. 22-24 show a section of an angle grinder with a guard fixing device with a locking element 18k according to an eleventh embodiment of the invention, which also has a straight tangential to the spindle 22k sliding handling element 20k. The latching element 18k has a toothing 46k, which corresponds to a corresponding toothing 48k of the protective hood 14k, so that the two toothings 46k, 48k in the in FIG. 22 engage locked position shown and secure the guard 14k against rotation.

The FIGS. 25-27 show a section of an angle grinder with a guard fastening device with a locking element 181 according to a twelfth embodiment of the invention, which also has a straight tangential to the spindle 221 slidable handling member 201. The latching element 181 is a ball which, in the direction of an axis of rotation of an insert tool, performs a longitudinal movement mediated by the handling element 201 or forced by a wedge surface or curved cam surface. In the unactuated, spring-loaded position of the handling element 201, the aforementioned surface locks the ejected ball to her, which engages in corresponding recesses 341 on the guard-spindle nozzle 241 and thus secures the guard 141 against rotation. The ball is independent of the handling element 201 captively stored on the power tool 101, so that even with the protective hood 141 removed can not fall out.

The Figures 28-30 show a section of an angle grinder with a protective cover fastening device with a locking element 18m according to a thirteenth embodiment of the invention. The latching element 18m is designed as a latching lug on an inner periphery of a spindle plate 22m of a power tool 10m frame-shaped surrounding handling element 20m of the type of sliding plate. The handling element 20m is slidably mounted perpendicular to the axis of rotation 30m of the insert tool on the housing 38m of the power tool 10m. The inner circumference limits a slot-like opening 50m.

FIG. 31 shows a section of an angle grinder with a protective cover fastening device with a latching element 18n according to a fourteenth embodiment of the invention and FIG. 32 shows the section FIG. 31 with a section of a protective hood 14n in an exploded view. In this guard fixing device is located around the fixed spindle neck 22n of the housing 38n of the protective tool fastening device 10n comprises an internally toothed, torsion-proof and spring-loaded ring 52n. The mounted protective hood 14n abuts with an end face of the guard spindle nozzle 24n on the end face of this ring 52n. Both end faces are blocked against rotation by interlocking locking elements 18n of the shape of a toothing.

In order to achieve a guard freewheel, the ring 52n is manually displaced against a spring element 26n, so that the engagement of the locking elements 18n dissolves. The protective hood 14n can then be rotated in accordance with the toothing pitch. Relaxing the spring element 26n, possibly with small rotational movements of the protective hood 14n, allows the latching elements 18n to engage again. In the effective direction of the spring element 26n of the ring 52n is held captive by a stop, not shown here on the spindle neck 22n. Suitable slopes of the locking elements 18n can facilitate automatic engagement.

In addition to compression springs, all spring types which appear suitable to the person skilled in the art can be used as spring elements, for example also leaf springs, leg coil springs or torsion bar springs.

Claims (13)

1. Protective-hood fastening device with a fastening element (12b, 12d, 12e) for fastening a protective hood (14b, 14d, 14e) which is provided for partially surrounding a rotating insertion tool, to a body (16b, 16d, 16e) of an electric tool (10b, 10d, 10e), the fastening element (12b, 12d, 12e) comprising at least one latching element (18b, 18b', 18d, 18d', 18e, 18e') for securing the protective hood (14b, 14d, 14e) against twisting with respect to the body (16b, 16d, 16e) of the electric tool (10b, 10d, 10e), with at least one handling element (20b, 20b', 20d, 20d', 20e, 20e') for manually releasing a latching connection, made by the latching element (18b, 18b', 18d, 18d', 18e, 18e'), between the body (16b, 16d, 16e) of the electric tool (10b, 10d, 10e) and the protective hood (14b, 14d, 14e), characterized by two essentially mirror-symmetrical latching elements (18b, 18b', 18d, 18d', 18e, 18e'), each of the latching elements (18b, 18b', 18d, 18d', 18e, 18e') being assigned a lever-like handling element (20b, 20b', 20d, 20d', 20e, 20e').
2. Protective-hood fastening device according to the preceding claim, characterized in that the handling element (20a - 20j) is designed as a lever.
3. Protective-hood fastening device according to either of the preceding claims, characterized by a spindle connection piece (22a - 22n), fastened to the body (16a - 16n) of the electric tool (10a - 10n), for securing the protective hood (14a - 14n) radially and axially.
4. Protective-hood fastening device according to Claim 3, characterized by a protective-hood spindle connection piece (24a - 24n) which is provided for making a plug connection with the spindle connection piece (22a - 22n) of the electric tool (10a - 10n).
5. Protective-hood fastening device according to Claim 3 and 4, characterized in that the protective-hood spindle connection piece (24a - 24n) and the spindle connection piece (22a - 22n) have matching surfaces in the form of a cylindrical surface area which are suitable for making a radially secure rotatable plug connection between the protective-hood spindle connection piece (24a - 24n) and the spindle connection piece (22a - 22n).
6. Protective-hood fastening device according to one of the preceding claims, characterized by at least two latching elements (18b, 18b'; 18d, 18d'; 18e, 18e') for securing the protective hood (14b; 14d; 14e) against twisting with respect to the body (16b; 16d; 16e) of the electric tool (10b; 10d; 10e).
7. Protective-hood fastening device according to one of the preceding claims, characterized in that the latching element (18f - 18h) comprises at least one eccentric cam for making the latching connection between the protective hood (14f - 14h) and the body (16f - 16h) of the electric tool (10f - 10h).
8. Protective-hood fastening device according to one of the preceding claims, characterized in that the handling element (20a - 20i) is mounted pivotably about a pivot axis (28a - 28i) on the body (16a - 16i) of the electric tool (10a - 10i).
9. Protective-hood fastening device according to Claim 8, characterized in that the pivot axis (28a - 28h) runs at least essentially parallel to an axis of rotation (30a - 30h) of the insertion tool.
10. Protective-hood fastening device according to Claim 8, characterized in that the pivot axis (28i) runs at least essentially perpendicularly to an axis of rotation (30i) of the insertion tool.
11. Protective-hood fastening device according to one of the preceding claims, characterized in that the electric tool (10a - 10n) is designed as an angle grinder.
12. Protective-hood (14a - 14n) which cooperates with the protective-hood fastening device from Claim 1, for fastening to a body (16a - 16n) of an electric tool (10a - 10n) and for at least partially surrounding a rotating insertion tool insertable into the electric tool (10a - 10n), with a latching recess (34a) for securing the protective hood (14a - 14n) against twisting with respect to the body (16a - 16n) of the electric tool (10a - 10n), characterized by a multiplicity of latching recesses (34a - 34n), which are assigned in each case to a rotary position of the protective hood (14a - 14n) with respect to the body (16a - 16n).
13. Angle grinder with a protective-hood fastening device according to one of Claims 1 - 11.

Images