EP2106325B1 - Portable power tool, especially angle grinder, comprising a protective hood - Google Patents
Portable power tool, especially angle grinder, comprising a protective hood Download PDFInfo
- Publication number
- EP2106325B1 EP2106325B1 EP07820407A EP07820407A EP2106325B1 EP 2106325 B1 EP2106325 B1 EP 2106325B1 EP 07820407 A EP07820407 A EP 07820407A EP 07820407 A EP07820407 A EP 07820407A EP 2106325 B1 EP2106325 B1 EP 2106325B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- power tool
- portable power
- clamping
- protective hood
- flange
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 230000001681 protective effect Effects 0.000 title claims abstract description 77
- 230000013011 mating Effects 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims 1
- 238000005520 cutting process Methods 0.000 description 4
- 239000011324 bead Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000009172 bursting Effects 0.000 description 2
- 238000004049 embossing Methods 0.000 description 2
- 238000007373 indentation Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 210000004072 lung Anatomy 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
- B24B55/04—Protective covers for the grinding wheel
- B24B55/05—Protective covers for the grinding wheel specially designed for portable grinding machines
- B24B55/052—Protective covers for the grinding wheel specially designed for portable grinding machines with rotating tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
- B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B27/00—Other grinding machines or devices
- B24B27/06—Grinders for cutting-off
- B24B27/08—Grinders for cutting-off being portable
Definitions
- the invention relates to a power tool according to the preamble of claim 1 (see. DE 101 24 439 A1 ).
- the guard is rotatably mounted on a nozzle of a flange of the angle grinder and releasably secured with only a single positive locking means.
- the flange will pass centrally from the spindle of the angle grinder.
- the spindle carries a separating or grinding disk, which can be tensely tensioned, for cutting and machining workpieces, which is partially encompassed by the protective hood.
- the protective hood on the handheld power tool is to be positioned so that it can be adjusted in a rotational manner such that the area of the grinding wheel facing the user is encompassed by the protective hood.
- the user points the way Area of grinding wheel for work piece engagement radially free beyond the flange.
- the invention relates to a hand tool for a rotating, preferably disc-shaped tool, with a machine housing having a flange or a machine neck and with a protective cover which is releasably tensioned on the flange or machine neck for covering the tool and a protective hood or protective hood collar has the annular wearing a tension band, which is contractible by means of a clamping means and wherein an acting between flange or machine neck and protective rotation between guard and flange or machine neck is arranged in the form of a profiling.
- the clamping means in its clamping position is repeatedly positively connected to the flange or machine neck and is in its release position out of shape with the flange or machine neck.
- This can advantageously be ensured a secure connection of the guard with the machine neck of the machine housing, which can withstand high loads in a working process.
- the guard is secured by means of profiling against rotation of the guard during operation of the power tool, so that in particular in the event of bursting of the tool, in particular a grinding wheel, the guard provides safe protection for the operator.
- the protective hood is basically used in hand-held power tools with a rotating, preferably disc-shaped tool, such as a grinding wheel, cutting disc and / or polishing pad, and particularly advantageous in an angle grinder used.
- a "flange or a machine neck” is to be understood as meaning a region of the handheld power tool which serves to receive and / or fix the protective hood, which at least partially encloses a tool, on the handheld power tool.
- This flange or machine neck can either be made in one piece with the hand tool or be formed by a separate component.
- a "guard hood or protective hood collar” arranged or molded onto the protective hood is to be understood here to mean a region extending preferably perpendicular to a main extension plane of the protective hood, which is provided for attachment to a flange or machine neck of the handheld power tool.
- This protective hood or guard collar is advantageously carried out in one piece with a base body of the guard.
- a “tension band” is to be understood here as meaning a band, particularly advantageously a metal band, which abuts a partial area of the protective hood, such as a protective hood, in particular for fastening the protective hood to the handheld power tool and / or in particular under a tension force. or positively encloses.
- a “tensioning means” should be understood to mean, in particular, a means having a circumference, in particular of the tensioning band, via a tensioning process, such as, for example, a folding over of a lever, a tightening of a Screw or any other skilled in the art appear appropriate process, reduced.
- a "profiling” is to be understood as meaning a shape, such as a hole structure, an edge and / or an inner embossing, which has a profile and / or a contour whose geometry is dependent on a function of the anti-twist device.
- a “clamping position” is to be understood here as meaning a position of the tension band in which the tension band with another component is a connection under a particular mechanical tension, such as, for example, a connection based on positive engagement, in particular with the flange or the machine neck Hand tool, received. Accordingly, a release position refers to a position of the tension band in which a clamping connection between the tension band and the other component is canceled.
- FIG. 1 is a trained by an angle grinder hand tool 10 is shown in a view from above.
- the angle grinding machine comprises a machine housing 14 and a main handle 66 integrated in the machine housing 14.
- the main handle 66 extends on a side 68 facing away from a tool 12 formed by a cutting disk in the direction of a longitudinal direction 70 of the angle grinding machine.
- an auxiliary handle 74 is arranged on this, which extends transversely to the longitudinal direction 70 of the angle grinder.
- the power tool 10 has a protective hood 18 which partially surrounds the tool 12 in a circumferential direction 76 of the tool 12.
- FIGS. 2a and 2b is a tool 12 facing portion of the power tool 10 and the machine housing 14 with a spindle 82 which is rotatable about a spindle axis 78 shown.
- the spindle 82 transmits a drive torque from a motor, not shown, of the power tool 10 to the tool 12.
- the portion has a flange 16 formed by a machine neck, which is fixedly connected to the machine housing 14.
- the flange 16 has centrally, in the region of the spindle 82, a circular recess 80, through which the spindle 82 is guided in an assembled state of the flange 16 to the machine housing 14.
- the spindle 82 projects beyond the flange 16 in an axial direction 84 that is perpendicular to the longitudinal direction 70 of the power tool 10. Furthermore, the flange 16 in a radial direction 86 outwardly to a tooth profile, the tooth-like, extending in the radial direction 86 outwardly extending teeth 58 and tooth gap-like, in the radial direction 86 inwardly extending recesses 38 and tooth gaps.
- the teeth are also puzzle-like or undercut in the radial direction 86 inwardly (see also Figures 2a to 3b ).
- the tooth profile is provided as a counter tooth profile 36 for coupling to a corresponding tooth profile 34 of the protective hood 18 (cf. FIGS. 5a, 5b and 5c). Furthermore, the counter tooth profile covers an area in the circumferential direction 76 of approximately 270 ° (FIG. FIGS. 2, 2b . 3a and 3b ).
- an orientation spring 62 is arranged in an area 88 of the flange 16, which has a smooth, tooth profile contour in the circumferential direction 76.
- the orientation spring 62 has the task of defining a precisely defined insertion position of the protective cover 18 when mounting the protective cover 18 with respect to the flange 16.
- the orientation spring 62 is formed by a bent spring steel sheet.
- the orientation spring 62 in the circumferential direction 76 at end regions 90 each have two support elements 92.
- the support elements 92 are arranged on the end regions 90 of the orientation spring 62 in the radial direction 86 to the outside (see. FIGS. 3a and 4 ).
- this has a recess 94 which extends in the circumferential direction 76 and has a length which corresponds to a length of the orientation spring 62 ( FIG. 3a ).
- the orientation spring 62 is supported within the recess 94 of the flange 16, wherein the support elements 92 engage through recesses 138 on a bottom 142 and a top 144 of the flange 16, so that the orientation spring 62 against falling out of the flange 16 is secured ( FIGS. 2a, 2b and 3b ).
- this U-shaped wherein the U-shaped portion 96 extends radially outward ( FIGS. 2b . 3a and 4 ). In this way, the U-shaped portion 96 protrudes in a mounted position of the orientation spring 62 radially outwardly beyond the smooth, non-profiled portion 88 of the flange 16 ( Figures 2b and 3a).
- FIGS. 5a and 5b show the power tool 10 with a mounted on the flange 16 protective cover 18, wherein the protective cover 18 is arranged on the flange 16 without auxiliary tool easily detachable and rotationally adjustable.
- the protective hood 18 comprises a disk-shaped main body 146 which, in the circumferential direction 76, covers a partial circle of approximately 180 ° of the tool 12 and is arranged centrically around the spindle 82.
- the protective hood 18 comprises a protective hood stub 20 formed by a protective hood collar.
- a clamping band 22 is arranged around the protective hood stub 20, which can be contracted by a tensioning means 24 and thereby prevents rotation by means of a profiling 26 between the flange 16 and the protective hood 18.
- end portions 98, 100 of the clamping band 22 are bent outward in the circumferential direction 76 and each form a lug 102, 104 formed by a pivot point, which are provided to an arrangement of the clamping means 24 with the clamping band 22 ( FIG. 6 ).
- An arcuate design of the tabs 102, 104 namely bent from outside to inside, reduce and / or prevent bending of the tabs 102, 104 in the case of load ( FIGS. 5a, 5b and 6 ).
- a fixation eg welded, riveted, etc.
- unfixed ends 106 of the tabs 102, 104 are also conceivable which, together with the tensioning band 22, allow suspension of the tensioning band 22.
- the design of the tabs 102, 104 of the tension band 22 can be realized as bent, bent and fixed against expansion or bent from outside to inside.
- the clamping means 24 is repeatedly positively connected in a clamping position with the flange 16 formed by the machine neck ( FIGS. 5a and 5b ). In a release position, the clamping means 24 is out of positive engagement with the flange 16.
- the clamping means 24 consists of clamping levers 28, 30, which form a toggle lever system 44.
- the clamping levers 28, 30 are formed by a rocker 40 and a locking bolt 42.
- the rocker 40 is movably mounted in the lug 102 of the tension band 22 with an end region 108 facing away from the locking bolt 42 via a bearing pin 110 about an axis of rotation which runs parallel or coaxially to the bearing pin 110.
- the rocker 40 or an end portion 118 of the rocker 40 facing the locking bolt 42 and a region 120 of the locking bolt 42 are rotatably supported relative to one another.
- the region 120 of the closure bar 42 is arranged after the end region 114 for storage in the tab 104 of the tension band 22 along the closure bar 42 in a direction away from the swing arm 40.
- the rocker 40 and the locking bolt 42 each have rear engagement means 32, 60 which are formed by a tooth profile 34 which forms the profiling 26 with the counter tooth profile 36 of the flange 16.
- the tooth profile 34 is provided for engagement in the counter-tooth profile 36 or in the recesses 38 of the flange 16 for the purpose of a torsion-proof positive connection between the protective cover 18 and the flange 16.
- the rear gripping means 32, 60 or the tooth profile 34 is arranged on a flange 16 facing side 122 of the locking bar 42 and the rocker 40.
- the rocker 40 in this case has three rear engagement means 32 and the locking bolt 42 has two rear engagement means 60 ( FIG. 7c ).
- the locking bar 42 facing the rear gripping means 32 of the rocker 40 engages in a clamping position in the same recess 38 of the counter-tooth profile 36 as the rocker 40 facing behind gripping means 60 of the locking bolt 42.
- the tension band 22 has a recess 124 in the region of the closure bolt 42 (FIG. FIG. 7b ), which extends in the circumferential direction 76 on the clamping band 22. Through the recess 124 engage the rear gripping means 60 of the locking bolt 42 and form with the opposing tooth profile 36 of the flange 16 a positive connection during a clamping position ( FIGS. 5a and 5b ).
- a recess 124 and a plurality of recesses in the clamping band 22 are possible, which are each provided only for a tooth 126 of the tooth profile 34 of the closure bolt 42.
- a width of teeth 126 of the tooth profile 34 is adapted to a width of the recesses 38 of the counter-tooth profile 36.
- the rocker 40 and the locking latch 42 are provided with holes 50 for weight reduction.
- One or more of the rear gripping means 32, 60 may also be formed ahead of the rest of the rear gripping means 32, 60 in the event of loading and thus touch the flange 16 earlier.
- An angle at contact surfaces of the rear gripping means 32, 60 and recesses 38 are designed in the leading rear gripping means 32, 60 so that they act in the case of a bursting tool 12, in particular a grinding or cutting disc, pulling and so an operator maximum protection in Operation of the power tool 10 learns.
- the protective cover 18 can be locked to the flange 16 in a fixed position.
- a mounting position in the circumferential direction 76 can be set by an operator and maximum protection for the operator can be achieved.
- the opposing tooth profile 36 of the flange 16 is limited in the circumferential direction 76 to a range of about 270 °, the opposing tooth profile 36 forms a coding means, so that an impermissible Position of the protective cover 18 can be prevented on the flange 16 and a closing of the toggle lever system 44 in the region 88 is prevented without counter-toothed profile 36.
- a guard edge 148 is loaded together with the protective hood 18 by flying tool parts.
- tearing forces and rotational forces occur on the protective hood 18, wherein undesired rotation of the protective hood 18 is prevented by means of the form-locking connection of the clamping device 24 with the flange 16.
- the tearing forces on the protective hood 18 and the tensioning band 22 act radially outward, as a result of which the locking bolt 42 and the rocker 40 or the toothed profile 34 engage in the recesses 38 or the counter tooth profile 36 of the flange 16 all the more firmly and thus dynamically Locking closure is created with highly effective anti-rotation.
- a closing force or a clamping force of the clamping band 22 can be adjusted together with the clamping means 24 for an operator.
- this also a clamping band length can be adjusted, such as to compensate for manufacturing tolerances.
- the tension band 22 has a half loop 46 which is realized in the circumferential direction 76 by a contour of the tension band 22 bent radially outward and then radially inwardly ( Figures 6, 7a and 7b ).
- the half-loop 46 has a recess 128, through which an adjusting element in the form of a screw 48 engages and is screwed to a nut 130. The tighter the nut 130 is bolted to the screw 48, the tighter a strap diameter or larger becomes the clamping force.
- tension band 22 deviating from the half loop 46 is possible at any time, such as a two-part design of the tension band 22 with two tension band elements, wherein the two tension band elements can be connected to one another by means of the adjustment element and thus a tension force or a tension band diameter can be adjusted.
- adjustability can be influenced by a number of adjusting elements and / or an embodiment of the adjusting elements and / or a position of the adjusting elements.
- the tension band 22 is inextricably disposed on the guard neck 20 over a range of 180 °. But it can also be attached over only a portion of eg 90 °, leaving the remaining portion of the tension band 22 free and stretchable.
- the tension band 22 can also be fixed at only one point.
- FIGS. 7a . 7b and 7c is the guard 18 with the clamping band 22 and the clamping means 24 in a clamping position ( FIGS. 7a and 7c ) and in a release position ( FIG. 7b ).
- the guard hood 20 of the protective hood 18, which is surrounded on a radially outwardly directed surface 132 of the clamping band 22, has perpendicular to the circumferential direction 76 extending, wave-like or hollow-tooth-like forms 52.
- a region 56 of the clamping band 22 abutting against the protective hood stub 20 also has wave profile-like or hollow-tooth-like characteristics 54 (FIG. FIG. 6 ).
- the hollow gear-like shapes 52 of the protective hood stub 20 have the main function of a Verdresterasterung the orientation spring 62 at an intended protective hood adjustment ( FIG. 8 ). Upon rotation of the protective cover 18, the orientation spring 62 engages from one to the next expression 52.
- the forms 52 correspond to the opposing tooth profile 36 of the flange 16 and constitute a, in particular coded, positioning aid.
- the orientation spring 62 mounted in the flange 16 is assigned a V-shaped impression 64 at a defined location in the tension band 22 (FIG. FIG. 6 ).
- FIGS. 9a and 14 Alternative embodiments are shown. Substantially identical components, features and functions are basically numbered by the same reference numerals. The following description is essentially limited to the differences from the embodiment in the FIGS. 1 to 8 , wherein with respect to the same components, features and functions on the description of the embodiment in the FIGS. 1 to 8 can be referenced.
- FIGS. 9a and 9b an alternative embodiment of an orientation spring 150 is shown.
- a middle, U-shaped Partial region 152 of the orientation spring 150 has, in each case, a curvature 154 in the circumferential direction 76 (FIG. FIG. 10a ) extending bead 156 in the form of notches, which cause a reinforcement of the portion 152.
- in the circumferential direction 76 left and right of the portion 152 each have a further, U-shaped region 158 arranged to support suspension during assembly of a protective cover 18 to a flange 160 of a power tool 10.
- In the circumferential direction 76 are at ends 162 of the orientation spring 150 enlarged mounting portions 164 arranged for attachment to the flange 160.
- beads 166 which are formed by indentations and which extend perpendicular to the circumferential direction 76, are embossed in the attachment regions 164.
- the attachment regions 164 extend perpendicular to the circumferential direction 76 and perpendicular to a radial direction 86 (FIG. Figures 10a and 10b ).
- the orientation spring 150 is inserted into a receiving portion 168 of the flange 160, and the flange 160 is plastically deformed in portions of the attachment portions 164 of the orientation spring 150 and pressed against the orientation spring 150.
- the orientation spring 150 is fixedly connected at its ends 162 to the flange 160.
- the receiving region 168 extends in the circumferential direction 76 on the flange 160 (FIG. Figures 10a and 10b ).
- Additional retaining elements 170 of the flange 160 which are arranged in the circumferential direction 76 to the left and right of the central, U-shaped portion 152 of the orientation spring 150, hold the orientation spring 150 in an advantageous starting position, which allows mounting of the protective cover 18 on the flange 160 and one Damage to the orientation spring 150 prevented.
- the holding elements 170 together with a radially inwardly facing wall 174 of the flange 160 limit a spring travel 176 of the orientation spring 150 in a radial direction 86 during assembly of the protective hood 18.
- FIGS. 11a and 12b is a to the toggle system 44 of the FIGS. 2 to 8 alternative tensioning system 200 shown.
- the tensioning system 200 has a tensioning strap 202, a rocker 206 formed by a tensioning part 204, and a tensioning means 210 formed by a screw 208.
- an end 212 of the clamping band 202 is bent radially outward and provided with a recess 214 for receiving the screw 208.
- the rocker 206 includes a receiving portion 216 with a thread formed by mating thread to the screw 208 so that by means of the screw 208, the rocker 206 and the strap 202, a protective cover 18 can be secured in a clamping position on a flange 16.
- the thread is introduced into oppositely and flushly curved, formed by portions forms 220 of the rocker 206, wherein the portions of the receiving portion 216 along a longitudinal extension 222 of the receiving portion 216 alternately, half-bow-like manner on opposite sides 224, 226 of the screw 208 ( FIG. 12b ).
- the mating thread is centrally introduced into a sheet thickness determining side 228 of the rocker 206.
- the end 212 has a screw lock 230 by bending end regions 232 of the end 212 in the direction 234 of a screw head 236 of the screw 208, so that this in the radial direction 86 inside the recess 214 is fixed.
- a pivot point or bearing point of the rocker 206 is disposed on an end 238 of the rocker 206 facing away from the screw 208 or on the end 240 of the tension band 202 facing the rocker 206.
- the recess 214 of the end 212 of the clamping band 202 in the radial direction 86 outwardly open, so that the screw 208 can be folded together with the rocker 206 to the outside and formed by teeth 244 rear gripping means 242 of the rocker 206 one of recesses 38th released counter tooth profile 36 of the flange 16 release. Closure of the tensioning system 200 takes place in a reverse order.
- FIG. 13 is one to the FIGS. 11a to 12b alternative embodiment of the rocker 260 shown.
- the rocker 260 has an end portion formed by an end tab 262 which extends perpendicular to a main extension surface 264 of the rocker 260 thereon.
- This end region has a recess 266 with a thread for a clamping means 210 formed by a screw 208, so that by means of the rocker 260, the screw 208 and a clamping band 202, a protective cover 18 can be clamped to a flange 16 of a hand tool 10.
- a nut may also be arranged in the end region.
- FIG. 14 is an alternative of a clamping member 280 formed rocker 282 to the FIGS. 11a to 13 shown.
- the rocker 280 includes two half rockers 284, 286, each having a half thickness 288 of the rocker 282.
- the rocker 282 has a receiving area 290 with a thread 292 for a clamping device 210 formed by a screw 208, wherein the half-rockers 284, 286 are formed in the receiving area 290 semi-arcuate for receiving the screw 208.
- the thread 292 is centered in a sheet thickness determining side 294 of the rocker 282 introduced.
- the half-wings 284, 286 by simple embossing a desired pitch shape and / or storage according to the screw 208 and the clamping means 210 form.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Grinding-Machine Dressing And Accessory Apparatuses (AREA)
- Harvester Elements (AREA)
- Clamps And Clips (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
Description
Die Erfindung geht aus von Handwerkzeugmaschine nach dem Oberbegriff des Anspruchs 1 (vgl.
Aus der
Die Erfindung geht aus von einer Handwerkzeugmaschine für ein rotierendes, vorzugsweise scheibenförmiges Werkzeug, mit einem Maschinengehäuse, das einen Flansch bzw. einen Maschinenhals aufweist und mit einer Schutzhaube, die an dem Flansch bzw. Maschinenhals zum Abdecken des Werkzeugs lösbar spannbar ist und die einen Schutzhaubenstutzen bzw. Schutzhaubenkragen aufweist der ringförmig ein Spannband trägt, das mittels eines Spannmittels zusammenziehbar ist und wobei eine zwischen Flansch bzw. Maschinenhals und Schutzhaube wirkende Verdrehsicherung zwischen Schutzhaube und Flansch bzw. Maschinenhals in Gestalt einer Profilierung angeordnet ist.The invention relates to a hand tool for a rotating, preferably disc-shaped tool, with a machine housing having a flange or a machine neck and with a protective cover which is releasably tensioned on the flange or machine neck for covering the tool and a protective hood or protective hood collar has the annular wearing a tension band, which is contractible by means of a clamping means and wherein an acting between flange or machine neck and protective rotation between guard and flange or machine neck is arranged in the form of a profiling.
Es wird vorgeschlagen, dass das Spannmittel in seiner Spannposition mehrfach formschlüssig mit dem Flansch bzw. Maschinenhals verbindbar ist und in seiner Löseposition außer Formschluss mit dem Flansch bzw. Maschinenhals steht. Hierdurch kann vorteilhaft eine sichere Verbindung der Schutzhaube mit dem Maschinenhals des Maschinengehäuses gewährleistet werden, die hohen Belastungen in einem Arbeitsprozess standhalten kann. Die Schutzhaube ist mittels der Profilierung gegen ein Verdrehen der Schutzhaube im Betrieb der Handwerkzeugmaschine gesichert, so dass insbesondere im Falle eines Berstens des Werkzeugs, insbesondere einer Schleifscheibe, die Schutzhaube einen sicheren Schutz für den Bediener bietet. Die Schutzhaube ist grundsätzlich bei Handwerkzeugmaschinen mit einem rotierenden, vorzugsweise scheibenförmigen Werkzeug, wie einer Schleifscheibe, Trennscheibe und/oder Polierscheibe, und besonders vorteilhaft bei einem Winkelschleifer einsetzbar.It is proposed that the clamping means in its clamping position is repeatedly positively connected to the flange or machine neck and is in its release position out of shape with the flange or machine neck. This can advantageously be ensured a secure connection of the guard with the machine neck of the machine housing, which can withstand high loads in a working process. The guard is secured by means of profiling against rotation of the guard during operation of the power tool, so that in particular in the event of bursting of the tool, in particular a grinding wheel, the guard provides safe protection for the operator. The protective hood is basically used in hand-held power tools with a rotating, preferably disc-shaped tool, such as a grinding wheel, cutting disc and / or polishing pad, and particularly advantageous in an angle grinder used.
In diesem Zusammenhang soll unter einem "Flansch bzw. einem Maschinenhals" ein Bereich der Handwerkzeugmaschine verstanden werden, der zur Aufnahme und/oder zur Befestigung der Schutzhaube, die zumindest teilweise ein Werkzeug umschließt, an der Handwerkzeugmaschine dient. Dieser Flansch bzw. Maschinenhals kann entweder einstückig mit der Handwerkzeugmaschine ausgeführt sein oder durch ein separates Bauteil gebildet werden. Unter einem an der Schutzhaube angeordneten bzw. angeformten "Schutzhaubenstutzen bzw. Schutzhaubenkragen" soll hier ein bevorzugt sich senkrecht zu einer Haupterstreckungsebene der Schutzhaube erstreckender Bereich verstanden werden, der zu einer Befestigung an einem Flansch bzw. Maschinenhals der Handwerkzeugmaschine vorgesehen ist. Dieser Schutzhaubenstutzen bzw. Schutzhaubenkragen ist vorteilhaft einstückig mit einem Grundkörper der Schutzhaube ausgeführt. Unter einem "Spannband" soll hier ein Band, besonders vorteilhaft ein Metallband, verstanden werden, das insbesondere zur Befestigung der Schutzhaube an der Handwerkzeugmaschine um einen Teilbereich der Schutzhaube, wie etwa einen Schutzhaubenstutzen, anliegt und insbesondere unter einer Spannkraft den Teilbereich kraft- und/oder formschlüssig umschließt. Ferner soll unter einem "Spannmittel" insbesondere ein Mittel verstanden werden, das einen Umfang, insbesondere des Spannbands, über einen Spannprozess, wie beispielsweise einem Umklappen eines Hebels, einem Anziehen einer Schraube oder einem anderen dem Fachmann als zweckdienlich erscheinenden Prozess, verkleinert. Ferner soll unter einer "Profilierung" eine Form, wie beispielsweise eine Lochstruktur, eine Kante und/oder eine Innenausprägung verstanden werden, die ein Profil und/oder eine Kontur aufweist, deren Geometrie abhängig von einer Funktion der Verdrehsicherung ist. Es ist aber auch eine andere dem Fachmann als sinnvoll erscheinende Verdrehsicherung denkbar. Unter einer "Spannposition" soll hierbei eine Position des Spannbands verstanden werden, in der das Spannband mit einem weiteren Bauteil eine unter einer insbesondere mechanischen Spannung stehende Verbindung, wie beispielsweise eine auf einen Formschluss basierende Verbindung, wie insbesondere mit dem Flansch bzw. dem Maschinenhals der Handwerkzeugmaschine, eingeht. Demzufolge bezeichnet eine Löseposition eine Position des Spannbands, bei der eine Spannverbindung zwischen dem Spannband und dem weiteren Bauteil aufgehoben ist.In this context, a "flange or a machine neck" is to be understood as meaning a region of the handheld power tool which serves to receive and / or fix the protective hood, which at least partially encloses a tool, on the handheld power tool. This flange or machine neck can either be made in one piece with the hand tool or be formed by a separate component. A "guard hood or protective hood collar" arranged or molded onto the protective hood is to be understood here to mean a region extending preferably perpendicular to a main extension plane of the protective hood, which is provided for attachment to a flange or machine neck of the handheld power tool. This protective hood or guard collar is advantageously carried out in one piece with a base body of the guard. A "tension band" is to be understood here as meaning a band, particularly advantageously a metal band, which abuts a partial area of the protective hood, such as a protective hood, in particular for fastening the protective hood to the handheld power tool and / or in particular under a tension force. or positively encloses. Furthermore, a "tensioning means" should be understood to mean, in particular, a means having a circumference, in particular of the tensioning band, via a tensioning process, such as, for example, a folding over of a lever, a tightening of a Screw or any other skilled in the art appear appropriate process, reduced. Furthermore, a "profiling" is to be understood as meaning a shape, such as a hole structure, an edge and / or an inner embossing, which has a profile and / or a contour whose geometry is dependent on a function of the anti-twist device. However, it is also conceivable another twist lock which appears to be appropriate to the person skilled in the art. A "clamping position" is to be understood here as meaning a position of the tension band in which the tension band with another component is a connection under a particular mechanical tension, such as, for example, a connection based on positive engagement, in particular with the flange or the machine neck Hand tool, received. Accordingly, a release position refers to a position of the tension band in which a clamping connection between the tension band and the other component is canceled.
Weitere Vorteile ergeben sich aus der folgenden Zeichnungsbeschreibung. In der Zeichnung sind Ausführungsbeispiele der Erfindung dargestellt.Further advantages emerge from the following description of the drawing. In the drawings, embodiments of the invention are shown.
Es zeigen:
- Fig. 1
- eine erfindungsgemäße Handwerkzeugmaschine mit einer Schutzhaube in einer schematischen Dar- stellung,
- Fig. 2a, 2b
- ein Teilbereich der Handwerkzeugmaschine mit einem Maschinengehäuse und einem Maschi- nenhals in zwei unterschiedlichen, perspekti- vischen Ansichten,
- Fig. 3a, 3b
- der Flansch mit einer Orientierungsfeder in zwei unterschiedlichen Ansichten,
- Fig. 4
- die Orientierungsfeder in einer perspektivi- schen Ansicht,
- Fig. 5a, 5b
- der Teilbereich der Handwerkzeugmaschine mit dem Maschinengehäuse und der montierten Schutzhaube (
Fig. 5a ) und eine Detaildarstel- lung eines Befestigungsbereichs (Fig. 5b ) in einer perspektivischen Ansicht, - Fig. 6
- das Spannband in einer perspektivischen An- sicht,
- Fig. 7a, 7b, 7c
- die Schutzhaube mit einem Spannband und einem Kniehebelsystem in einer Spannposi- tion (
Fig. 7a, 7c ) und einer Löseposition (Fig. 7b ) in jeweils einer perspektivischen Ansicht, - Fig. 8
- die Schutzhaube mit der Orientierungsfeder in einer perspektivischen Ansicht,
- Fig. 9a, 9b
- eine alternative Ausgestaltung der Orien- tierungsfeder in einer perspektivischen An- sicht (
Fig. 9a ) und einer Ansicht von oben (Fig. 9b ), - Fig. 10a, 10b
- die Orientierungsfeder aus den
Figu- ren 9a und 9b innerhalb eines Flansches ange- ordnet in einer perspektivischen Ansicht (Fig. 10a ) und einer Ansicht von oben (Fig. 10b ), - Fig. 11a, 11b
- ein Teilbereich der Handwerkzeugma- schine mit einer montierten Schutzhaube mit einem alternativen Verschlusselement in einer perspektivischen Ansicht,
- Fig. 12a, 12b
- die Schutzhaube aus den
Figuren 9a und 9b mit dem alternativen Verschlusselement in einer perspektivischen Ansicht und einer Seitenansicht, - Fig. 13
- eine alternative Ausgestaltung einer Schwinge in einer perspektivischen Ansicht und
- Fig. 14
- eine weitere Ausgestaltung der Schwinge in ei- ner perspektivischen Ansicht.
- Fig. 1
- a hand tool according to the invention with a protective hood in a schematic representation,
- Fig. 2a, 2b
- a subregion of the handheld power tool with a machine housing and a machine neck in two different, perspective views,
- Fig. 3a, 3b
- the flange with an orientation spring in two different views,
- Fig. 4
- the orientation spring in a perspective view,
- Fig. 5a, 5b
- the sub-area of the power tool with the machine housing and the mounted protective hood (
Fig. 5a ) and a detailed representation of a fixing area (Fig. 5b ) in a perspective view, - Fig. 6
- the strap in a perspective view,
- Fig. 7a, 7b, 7c
- the protective hood with a tension band and a toggle lever system in a clamping position (
Fig. 7a, 7c ) and a release position (Fig. 7b ) in each case in a perspective view, - Fig. 8
- the protective hood with the orientation spring in a perspective view,
- Fig. 9a, 9b
- an alternative embodiment of the orientation spring in a perspective view (
Fig. 9a ) and a view from above (Fig. 9b ) - Fig. 10a, 10b
- the orientation spring from the
FIGS. 9a and 9b within a flange arranged in a perspective view (Fig. 10a ) and a view from above (Fig. 10b ) - Fig. 11a, 11b
- a partial area of the hand-held power tool with a mounted protective hood with an alternative closure element in a perspective view,
- Fig. 12a, 12b
- the protective cover from the
FIGS. 9a and 9b with the alternative closure element in a perspective view and a side view, - Fig. 13
- an alternative embodiment of a rocker in a perspective view and
- Fig. 14
- a further embodiment of the rocker in a perspective view.
In
In den
In einem Bereich 88 des Flansches 16, der in Umfangsrichtung 76 eine glatte, zahnprofillose Kontur aufweist, ist eine Orientierungsfeder 62 angeordnet. Die Orientierungsfeder 62 hat die Aufgabe, eine genau definierte Einführposition der Schutzhaube 18 bei einer Montage der Schutzhaube 18 bezüglich des Flansches 16 festzulegen. Hierzu ist die Orientierungsfeder 62 von einem gebogenen Federstahlblech gebildet. Zu einer Abstützung der Orientierungsfeder 62 an dem Flansch 16 weist die Orientierungsfeder 62 in Umfangsrichtung 76 an Endbereichen 90 jeweils zwei Abstützelemente 92 auf. Die Abstützelemente 92 sind an den Endbereichen 90 der Orientierungsfeder 62 in radialer Richtung 86 nach außen angeordnet (vgl.
Die
Das Spannmittel 24 ist in einer Spannposition mehrfach formschlüssig mit dem von dem Maschinenhals gebildeten Flansch 16 verbindbar (
Die Schwinge 40 und der Verschlussriegel 42 weisen jeweils Hintergreifmittel 32, 60 auf, die von einem Zahnprofil 34 gebildet sind, das mit dem Gegenzahnprofil 36 des Flansches 16 die Profilierung 26 bildet. Das Zahnprofil 34 ist zu einem Eingreifen in das Gegenzahnprofil 36 bzw. in die Ausnehmungen 38 des Flansches 16 zwecks einer verdrehsicheren Formschlussverbindung zwischen der Schutzhaube 18 und dem Flansch 16 vorgesehen. Die Hintergreifmittel 32, 60 bzw. das Zahnprofil 34 ist an einer dem Flansch 16 zugewandten Seite 122 des Verschlussriegels 42 bzw. der Schwinge 40 angeordnet. Die Schwinge 40 weist hierbei drei Hintergreifmittel 32 und der Verschlussriegel 42 zwei Hintergreifmittel 60 auf (
Mittels des Zahnprofils 34, das in einem montierten Zustand der Schutzhaube 18 in die Gegenzahnprofil 36 des Flansches 16 greift, ist die Schutzhaube 18 an dem Flansch 16 in einer festen Position arretierbar. Zudem kann eine Montageposition in Umfangsrichtung 76 durch einen Bediener festgelegt werden und ein maximaler Schutz für den Bediener erzielt werden. Indem sich das Gegenzahnprofil 36 des Flansches 16 in Umfangsrichtung 76 auf einen Bereich von ca. 270° beschränkt, bildet das Gegenzahnprofil 36 ein Kodierungsmittel, so dass eine unzulässige Position der Schutzhaube 18 an dem Flansch 16 verhindert werden kann und ein Schließen des Kniehebelsystems 44 in dem Bereich 88 ohne Gegenzahnprofil 36 verhindert ist.By means of the
Bei einem Bersten des Werkzeugs 12 wird durch umherfliegende Werkzeugteile ein Schutzhaubenrand 148 zusammen mit der Schutzhaube 18 belastet. Dabei treten Zerrkräfte und Drehkräfte an der Schutzhaube 18 auf, wobei ein unerwünschtes Verdrehen der Schutzhaube 18 jedoch mittels der Formschlussverbindung des Spannmittels 24 mit dem Flansch 16 verhindert ist. Überdies wirken die Zerrkräfte an der Schutzhaube 18 und dem Spannband 22 radial nach außen, wodurch der Verschlussriegel 42 und die Schwinge 40 bzw. das Zahnprofil 34 umso fester in die Ausnehmungen 38 bzw. das Gegenzahnprofil 36 des Flansches 16 greifen und so ein dynamisch immer fester arretierender Verschluss mit hochwirksamer Verdrehsicherung geschaffen wird.When the
Des Weiteren ist eine Verschlusskraft bzw. eine Spannkraft des Spannbands 22 zusammen mit dem Spannmittel 24 für einen Bediener einstellbar. Zudem kann hierdurch auch eine Spannbandlänge eingestellt werden, wie beispielsweise zum Ausgleich von Fertigungstoleranzen. Hierzu weist das Spannband 22 eine Halbschlaufe 46 auf, die in Umfangsrichtung 76 durch eine radial nach außen und anschließend radial nach innen gebogene Kontur des Spannbands 22 realisiert ist (
In den
In den
In den
In den
In
Claims (21)
- Portable power tool for a rotating, preferably disc-shaped tool (12), comprising a machine housing (14) which has a flange (16, 160) or a machine neck and comprising a protective hood (18) which can be detachably clamped on the flange or machine neck for covering the tool (12) and which has a protective hood connection piece (20) or protective hood collar which carries a clamping band (22) in an annular manner, which clamping band (22) can be tightened by a clamping means (24), and wherein an anti-rotation locking means acting between flange or machine neck and protective hood (18) is arranged between protective hood (18) and flange or machine neck in the form of a profiling (26), characterized in that the clamping means (24) can be connected to the flange or machine neck in a multiple form-fitting manner in its clamping position and is disengaged from the form-fit connection in its release position.
- Portable power tool according to Claim 1, characterized in that the clamping means (24) has a clamping lever (28, 30) having a back-engagement means (32) or a tooth profile (34) for engaging in a mating tooth profile (36) or in recesses (38) of the flange (16, 160) or of the machine neck.
- Portable power tool at least according to Claim 2, characterized in that the clamping levers (28, 30) are formed by a rocker (40) and a locking latch (42).
- Portable power tool at least according to Claim 2, characterized in that the clamping levers (28, 30) form a toggle lever system (44).
- Portable power tool according to one of the preceding claims, characterized in that the clamping band (22) has a bent, projecting semi-loop (46) which can be tightened by an adjusting element for readjusting the clamping force, said adjusting element passing through said semi-loop (46).
- Portable power tool at least according to Claims 4 and 5, characterized in that the bent, projecting semi-loop (46) can be tightened by means of the adjusting element for readjusting the clamping force of the toggle lever system (44).
- Portable power tool according to one of the preceding claims, characterized in that the clamping band (22) has at least two clamping band elements which are intended for readjusting the clamping force of the toggle lever system (44) by means of the adjusting element.
- Portable power tool at least according to Claim 3, characterized in that the rocker (40) and the locking latch (42) are provided with a plurality of holes (50) in order to save weight and provide a better grip.
- Portable power tool according to one of the preceding claims, characterized in that wave-profile-like or ring-gear-like embossments (52) are arranged in the protective hood connection piece (20) or protective hood collar.
- Portable power tool at least according to Claim 1 or 5, characterized in that the clamping band (22, 202) has wave-profile-like or ring-gear-like embossments (54).
- Portable power tool at least according to Claim 10, characterized in that the clamping band (22, 202) comprises a region (56) which bears on the outside against the protective hood collar and which has the wave-profile-like or ring-gear like embossments (54).
- Portable power tool at least according to Claim 2, characterized in that the back-engagement means (32, 60) or the tooth profile (34) are/is provided with puzzle-like or undercut teeth (58) or tooth gaps for engaging in a mating tooth profile (36) or in recesses (38) of the flange (16, 160) or of the machine neck, and said undercut teeth (58) or tooth gaps, when rotary forces act on the protective hood (18), develop an effect which tightens or retightens the clamping band (22).
- Portable power tool according to one of the preceding claims, characterized in that an orientation spring (62, 150) is arranged on the flange (16, 160) or the machine neck, an impression (64) on the clamping band (22) being assigned to said orientation spring (62, 150) for fitting in position when the protective hood (18) is placed axially on the machine neck.
- Portable power tool at least according to Claims 9 and 13, characterized in that the orientation spring (62, 150) interacts in an over-latching manner with the wave-profile-like or ring-gear-like embossments (52) of the protective hood collar when the protective hood (18) is rotated.
- Portable power tool according to one of the preceding claims, characterized in that a screw (208) serves as clamping means (210) and engages in a clamping part (204) which is provided with teeth (244) fitting into radial recesses (38) of the flange (16) or machine neck and which, with its end (238) remote from the screw (208), is coupled to the clamping band (202).
- Portable power tool at least according to Claim 15, characterized in that the clamping part (204), with its end (238) remote from the screw (208), is coupled to an end (240) of the clamping band.
- Portable power tool at least according to Claims 15 and 16, characterized in that the screw (208) is coupled to the other end (212) of the clamping band (202).
- Portable power tool at least according to Claim 15, characterized in that the clamping part (204) has a thread serving to accommodate the screw (208).
- Portable power tool at least according to Claim 18, characterized in that the thread passes through an end tab (262) bent at right angles on the clamping part (204).
- Portable power tool at least according to Claim 18, characterized in that the thread is made in embossments of the clamping part (204) which are arched in opposite directions and in an aligned manner.
- Portable power tool at least according to Claim 18, characterized in that the thread is made centrally in that side (228, 294) of the clamping part (204) which determines the sheet thickness.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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DE102006053304 | 2006-11-13 | ||
DE102007041840A DE102007041840A1 (en) | 2006-11-13 | 2007-09-03 | Hand tool with protective hood, in particular angle grinder |
PCT/EP2007/059969 WO2008058793A1 (en) | 2006-11-13 | 2007-09-20 | Portable power tool, especially angle grinder, comprising a protective hood |
Publications (2)
Publication Number | Publication Date |
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EP2106325A1 EP2106325A1 (en) | 2009-10-07 |
EP2106325B1 true EP2106325B1 (en) | 2010-05-12 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07820407A Active EP2106325B1 (en) | 2006-11-13 | 2007-09-20 | Portable power tool, especially angle grinder, comprising a protective hood |
Country Status (7)
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US (1) | US7909680B2 (en) |
EP (1) | EP2106325B1 (en) |
CN (1) | CN101535000B (en) |
AT (1) | ATE467484T1 (en) |
DE (2) | DE102007041840A1 (en) |
RU (1) | RU2456148C2 (en) |
WO (1) | WO2008058793A1 (en) |
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SE9201990L (en) * | 1992-06-29 | 1993-12-30 | Atlas Copco Tools Ab | Pneumatic rotary grinder |
SE507264C2 (en) * | 1996-06-13 | 1998-05-04 | Atlas Copco Tools Ab | Handheld power tool |
RU2152862C2 (en) * | 1998-08-10 | 2000-07-20 | Закрытое Акционерное Общество "Энерпред" | Hand-grinding machine |
DE10000701A1 (en) * | 2000-01-10 | 2001-07-12 | Bosch Gmbh Robert | Angle grinder protection hood |
US6464573B1 (en) * | 2000-06-30 | 2002-10-15 | Porter-Cable Corporation | Guard attachment system with knurled clamp ring |
DE10124439A1 (en) * | 2001-05-18 | 2002-11-21 | Bosch Gmbh Robert | Protective hood of an electric angle grinder has an expanding clamp band held around a shaped housing collar about which it may be turned and clamped |
US6893334B1 (en) * | 2002-01-24 | 2005-05-17 | J. David Stivers | Rotating guard for angle grinder |
US6699114B1 (en) * | 2002-04-26 | 2004-03-02 | Benedict Engineering Company, Inc. | Pivotal guards for power hand tools with rotating discs |
DE10259520A1 (en) * | 2002-12-19 | 2004-07-01 | Robert Bosch Gmbh | Electric hand tool |
DE10316182A1 (en) * | 2003-04-09 | 2004-10-28 | Robert Bosch Gmbh | Hand grinder with protective hood |
DE10336873B4 (en) * | 2003-08-11 | 2007-09-20 | Hilti Ag | Guard assembly |
DE10343060A1 (en) * | 2003-09-16 | 2005-04-07 | Robert Bosch Gmbh | Protective cowl for hand power tool especially for angle grinder has an adjustable fitting with a finger pressure ratchet lever engaging ratchet holes in cowl mounting |
-
2007
- 2007-09-03 DE DE102007041840A patent/DE102007041840A1/en not_active Withdrawn
- 2007-09-20 WO PCT/EP2007/059969 patent/WO2008058793A1/en active Application Filing
- 2007-09-20 US US12/279,883 patent/US7909680B2/en active Active
- 2007-09-20 DE DE502007003805T patent/DE502007003805D1/en active Active
- 2007-09-20 AT AT07820407T patent/ATE467484T1/en active
- 2007-09-20 EP EP07820407A patent/EP2106325B1/en active Active
- 2007-09-20 RU RU2009122231/02A patent/RU2456148C2/en not_active IP Right Cessation
- 2007-09-20 CN CN2007800421329A patent/CN101535000B/en active Active
Also Published As
Publication number | Publication date |
---|---|
WO2008058793A1 (en) | 2008-05-22 |
US7909680B2 (en) | 2011-03-22 |
DE102007041840A1 (en) | 2008-05-15 |
CN101535000A (en) | 2009-09-16 |
RU2456148C2 (en) | 2012-07-20 |
DE502007003805D1 (en) | 2010-06-24 |
ATE467484T1 (en) | 2010-05-15 |
US20090029635A1 (en) | 2009-01-29 |
CN101535000B (en) | 2012-05-16 |
EP2106325A1 (en) | 2009-10-07 |
RU2009122231A (en) | 2010-12-20 |
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