EP2214866B1 - Hand-held power tool - Google Patents
Hand-held power tool Download PDFInfo
- Publication number
- EP2214866B1 EP2214866B1 EP08804856.6A EP08804856A EP2214866B1 EP 2214866 B1 EP2214866 B1 EP 2214866B1 EP 08804856 A EP08804856 A EP 08804856A EP 2214866 B1 EP2214866 B1 EP 2214866B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- stop
- power tool
- counter
- portable power
- tool according
- 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 claims description 100
- 230000005540 biological transmission Effects 0.000 claims description 51
- 238000013016 damping Methods 0.000 claims description 25
- 239000000463 material Substances 0.000 claims description 12
- 230000000903 blocking effect Effects 0.000 claims description 10
- 239000012634 fragment Substances 0.000 claims description 9
- 238000007373 indentation Methods 0.000 claims description 2
- 230000009172 bursting Effects 0.000 description 10
- 239000002245 particle Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- 230000000977 initiatory effect Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 241000511343 Chondrostoma nasus Species 0.000 description 1
- 239000011358 absorbing material Substances 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 238000009420 retrofitting Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
Classifications
-
- 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
- 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
Definitions
- the invention relates to a hand tool according to the preamble of claim 1.
- the angle grinder includes a housing having an output shaft exiting the housing and a flange disposed on the housing forming a flange neck. On the flange neck a protective device is received, which is rotatable in the circumferential direction. To lock the directions of rotation of the protective device, a locking lever is provided, which generates a positive connection with the protective device in its rest position, wherein a stop and a counter stop cooperating with the stop is proposed for locking.
- the invention relates to a hand tool, in particular an angle grinder, as already known from the DE 39 13 898 is known.
- the protective device according to claim 1 the user of the power tool in case of a possible bursting of the grinding wheel, Protect against injuries in a so-called burst-wheel case. Typically, a broken grinding wheel will set the guard in rotation.
- the device according to the invention makes it possible, in an emergency or "burst-wheel case", to prevent rotation of the protective device to reduce energy at a defined point.
- the stops represent the last possible and desired rotational position of the protective device.
- the embodiment of the portable power tool according to the invention makes it possible to produce a simple and cost-effective locking device. There is no additional separate locking device necessary, since only necessary for the locking of the protective device components are provided on parts of the power tool.
- the stops are designed such that in emergency operation, a rotation of the protective device in at least one direction of rotation is only possible up to a predetermined rotational position.
- the device initially allows a rotational movement of the protective device relative to the housing until the stop and the counter-stop meet one another.
- normal operation is understood to mean the operation of a handheld power tool in which only energy from parts in contact with the protective device acts on the protective device up to a predetermined value.
- Emergency operation is to be understood as meaning operation of the handheld power tool in which energy of parts in contact with the protection device acts on the protection device above the predetermined value.
- the protective device is preferably arranged around a disc-shaped and rotating tool of a hand tool, such as an angle grinder, so that by the protective device during 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 sliced in operation disc, such as a grinding wheel, a cutting disc, etc., can be advantageously slowed down or an energy, in particular a kinetic energy of the particles can be reduced.
- the device for blocking at least one direction of rotation of the protective device is designed so that the protective device absorbs energy when breaking tool fragments by the protective device first performs a rotational movement or rotational movement to the housing of the power tool.
- the clamping device generates a frictional connection between the flange neck and the protective device by means of a press fit.
- the clamping device is designed such that it comes at the initiation of a power surge with a predetermined value in the protection device to the rotational movement of the protective device relative to the housing.
- the protective device in normal operation, ie at a power surge below the predetermined value, fixedly coupled to the flange neck or to the housing and performs only in emergency operation, ie at a power surge above the predetermined value, a rotational movement relative to the flange neck or housing.
- the static friction between flange neck and protective device is overcome, and the two components can perform a relative movement to each other by a certain angular range. This absorbs some of the energy and reduces the velocity of the fragments leaving the guard.
- the stops are designed such that they prevent twisting of the protective device in a direction of rotation and allow rotation of the protective device in the opposite direction of rotation.
- the stops are designed such that they prevent twisting of the protective device in a direction of rotation and allow rotation of the protective device in the opposite direction of rotation.
- only the direction of rotation is locked, in which the protective device would rotate uncontrollably in an emergency operation.
- twisting or locking of the protective device is possible.
- the stop protection device fixed and the counter-stop is fixed to the housing fixed to the power tool.
- the protective device fixed stop is moved with a movement of the protective device relative to the other hand tool with the protective device, while the housing-fixed stop remains stationary relative to the power tool.
- the housing-fixed stopper is also referred to as a "static" stop and the guard fixed stop also as a "moving" stop.
- this is to interrupt the relative movement of the protective device relative to the housing and the attacks can be used as a so-called "burst-wheel-fuse".
- the stops allow relative movement of the protective device relative to the housing of the power tool until the "static" stop on the housing and the "moved" counter-stop on the protective device meet.
- a tool manufacturer thus has the opportunity to determine the burst-wheel stops in a suitable and safe for the user position. This position can allow a maximum allowable twist angle of the protection device, but taking into account that in a bursting of the disc, the user is not injured. If a user can choose the position of the burst-wheel stops himself, then the tool manufacturer can encode the permissible positions.
- the stop is provided on a strap of the protective device. This allows a simple, inexpensive production with easy accessibility of the attack.
- the arrangement of the stop on the strap of the protective device causes an optimal interaction with a counter-stop arranged on the housing.
- Other components, space, assembly costs and costs can be advantageously saved when the stop is at least partially formed by a closure element, such as a clamping screw, a nut, a clamping lever and / or further, the expert appears useful as closure elements.
- the counter-stop is provided on a gear flange, on the flange neck, on a gear housing and / or on a housing element.
- advantageously already existing elements, such as screws for mounting the gear flange on the gear housing can also be designed as a counter-stop and used.
- the counter-stop is formed integrally with the gear flange, the flange neck, the gear housing and / or the housing element.
- the device for locking, in particular the counter-stop of the protective device for locking thereby advantageously provided to be subsequently integrated on the gear flange, the flange neck, the gear housing and / or the housing element of the power tool.
- the housing element is designed as an element provided on or under the gearbox flange or as an element which can be accommodated on the flange neck.
- any conceivable position of the housing stop can be implemented thereby.
- the stop are adjustably arranged on the protective device and / or the counter-stop adjustable on the housing and / or on the housing element.
- This makes it possible to determine the burst-wheel stops in a suitable and safe for the user position. This position can allow a maximum allowable twist angle of the protection device, but taking into account that in a bursting of the disc, the user is not injured. If a user can select the position of the burst-wheel stops themselves, then the tool manufacturer can encode the permissible positions, for example via predetermined threaded holes for a screw-in stop pin.
- the housing element is adjustably connected to the housing.
- the counter-stop is automatically adjustable via the adjustable housing on the housing element. The variation of the stop position can be controlled by the choice of the position of the housing member on the housing without additional effort.
- the connection of the housing element to the housing takes place via projections of the housing element and / or of the housing, which can be inserted into recesses of the housing and / or of the housing element. After applying and attaching the protection device on the flange neck, the housing element is fixed on the transmission flange.
- this housing element is advantageously conceivable as a retrofit.
- the device for blocking has at least one damping device.
- the damping device usually, after the initiation of the energy impact when the tool ruptures, the static friction between the flange neck and the protective device is overcome, and the two components can advantageously perform a relative movement relative to one another until the stops strike one another. As a result, some of the energy is already absorbed and the speed of the fragments emerging from the protective device is reduced.
- the damping device now additionally acts to absorb energy.
- the counter-stop and / or the stop has the damping device and / or is designed as a damping device.
- the damping device can be adapted to the application at any time both by the manufacturer and by the customer.
- the stop is designed as at least one nose, which engages in a groove formed as a counter-stop. This embodiment allows a simple and cost-effective production of the locking device, since only one more groove and a nose are provided in a component of the power tool.
- the boundary of the groove is formed by an inserted into the groove element, provided on the disc element tab or provided on the plate member protuberance.
- the housing-fixed counter-stop additionally serves as a hold-down for the protection device.
- a component fulfills two functions.
- the device for locking has at least one receiving unit which is arranged on a transmission flange and is provided for receiving the counter-stop, whereby a particularly advantageous, in particular stable arrangement or recording of the counter-attack on the transmission flange can be achieved.
- the receiving unit is preferably designed to receive forces which are transmitted by the protective device moving in the direction of rotation due to a tool part of a bursting tool being transmitted via the counter-stop or to support the counter-stop against these forces to protect an operator of the hand-held power tool ,
- the receiving unit has at least one recess on the gear flange, which is provided for receiving the counter-stop, whereby a structurally simple recording of the counter-attack on the gear flange can be realized.
- a shape of the recess is accurately formed on a shape of the counter-stop, so that a particular safe and play-free arrangement of the counter-attack can be achieved.
- the receiving unit has at least one support element which supports the counter-stop in at least one direction of rotation. It can be a stable support of the counter-attack, in particular in a direction of rotation of a tool in an impact of the stop on the counter-stop, can be achieved while damaging the counter-attack are at least partially prevented. This can be achieved in a structurally simple manner if the support element is formed by a web extending in the radial direction.
- the receiving unit has at least one support element which supports the counter-stop in at least one radial direction, whereby an advantageous support of the counter-stop can be achieved outwardly in the case of a bursting tool and also in particular occurring in an impact centrifugal forces in the radial direction outside to protect an operator can be intercepted.
- the support member for supporting the counter-stop in the radial direction and / or the support member for supporting the counter-stop in at least one direction of rotation of the transmission flange can be achieved if the support element for supporting the counter-stop in the radial direction and / or the support element for supporting the counter-stop in at least one direction of rotation is formed integrally with a transmission flange.
- the term "in one piece” is to be understood to mean, in particular, in one piece, made of a cast and / or designed as a component.
- An advantageous replacement of the counter-stop on the gear flange can be achieved if the counter-stop is screwed to a gear flange. If a screw is provided for attachment of the counterstop to the gearbox flange preferably at the same time for attachment of the gearbox flange to the handheld power tool or to the housing, a particularly compact arrangement and a particularly stable attachment to the gearbox flange can be achieved.
- the counter-stop is already preassembled on the transmission flange and is mountable with the transmission flange as a unit and / or by means of an alternative, the expert appears to be useful attachment to the transmission flange and / or particularly advantageous in one piece is formed of the transmission flange.
- the counter-stop is formed of a material that is different from a material of a gear flange, whereby properties of the counter-stop are advantageously adapted to a power transmission or a power transmission to the counter-attack upon impact of the stop in the case of a bursting tool can.
- the counter-stop may be formed of a material that already absorbs part of the energy transferred to the counter-stop and only passes on part of the energy to the transmission flange and / or the hand-held power tool.
- the counter-stop has a recess which is arranged in an impact area for the stop, whereby an advantageous receiving a closure element, in particular a nut, which is provided for screwing with a clamping screw, can be achieved in the impact area and
- a clamping screw end can advantageously be passed to the counter-stop.
- FIG. 1 shows a partially illustrated hand tool.
- the hand tool is an angle grinder 10.
- the angle grinder 10 has a housing 14 which comprises a motor housing 50 and a gear housing 32 flanged to the motor housing 50. From the gear housing 32 protrudes an output shaft 52, which carries at its free end a disk-shaped tool 54, for example, a grinding wheel which is rotatably driven about an axis 56 of the output shaft 52.
- the output shaft 52 is rotatably mounted in a non-visible bearing, which is received in the present embodiments by a gearbox 32 formed by the transmission flange 30.
- the transmission housing 32 forms a subsequent to the transmission flange 30, freely projecting, cylindrical flange neck 12 which engages around the output shaft 52.
- the flange neck 12 receives on its outer periphery a protective device 16, in the form of a protective hood, which in the circumferential direction 18, 20 on the flange neck 12 is rotatable.
- the protective device 16 comprises a main body 58 and a receiving collar 28 connected to the main body 58, which forms a central opening for the free passage of the output shaft 52.
- the receiving collar 28 is designed as a cylindrical body which runs parallel to the flange neck 12.
- the main body 58 is provided for protection of an operator of the power tool from sparks and / or material particles that arise during operation of the power tool.
- the base body 58 is formed by a plate-shaped element 60, which has a semicircular design, wherein the plate-shaped element 60 covers an angular range of approximately 180 ° of the tool 54.
- a protective edge 62 Arranged on the dish-shaped element 60 is a protective edge 62, which is initially aligned perpendicular to the dish-shaped element 60 and subsequently parallel to the dish-shaped element 60.
- the protective device 16 is in the following embodiments by clamping the band designed as a clamping band 28 by frictional engagement on the Flanschhals 12, similar to a pipe clamp, attached, with any other one skilled in the art seem appropriate sense attachment of the protective device 16 on the flange neck 12 is conceivable.
- the strap may also be present as a separate part, which is placed around the receiving collar of the protective device 16.
- the clamping of the clamping band 28 is usually carried out either via a clamping screw 64 or via a clamping lever.
- the hand tool 10 comprises the clamping band 28 and a clamping unit 66.
- the clamping band 28 is annular and preferably welded to the main body 58.
- the annular tension band 28 is tensioned around the flange neck 12 by means of the tensioning unit 66, by a circumference of the annular tension band 28 via the tensioning unit 66 is shortened or extended.
- the clamping unit 66 shown in the embodiment two ends 68 of the clamping band 28 are braced against each other via the clamping screw 64.
- the handheld power tool 10 has a device 22 for blocking at least one direction of rotation 18, 20 of the protective device 22.
- the device 22 according to the invention comprises at least one stop 24 and at least one cooperating with the stop 24 counter-stop 26, wherein the stop 24 Schutzvoriquessfest and the counter-stop 26 is fixed to the housing fixed to the power tool 10.
- the rotation of the protective device 16 is stopped by means of the protective device-fixed stop 24, which runs onto the housing-fixed counter-stop 26.
- the at least one stop 24 and the at least one counter stop 26 designed such that in emergency operation of the power tool 10, a rotation of the protective device 16 in at least one direction of rotation 18, 20 is only possible up to a predetermined rotational position.
- the stops 24, 26 are designed such that they prevent rotation of the protective device 16 in a direction of rotation 18 or 20 and allow rotation of the protective device 16 in the opposite direction of rotation 20 or 18.
- the stop 24 is provided on the tension band 28 of the protective device 16, wherein any other, the expert appears appropriate Protective device fixed arrangement of the stopper 24 is possible.
- the embodiments show different variants of the arrangement of the stop 24 on the tension band 28, such as an arrangement on an outer side 72 of the tension band 28, an arrangement on an inner side 42 of the tension band 28, an arrangement on an end face 44 of the tension band 28 or a further variant in which the stop 24 is integrated into the protective device 16 or designed in one piece with the protective device 16 by the two ends 68 of the clamping band 28 serve as a stop 24.
- the stop 24 can be designed both as a separate component fastened to the tensioning band 28 and integrally with the protective device 16.
- the housing-fixed counter-stop 26 is attached to different components.
- the counter-stop 26 is provided, for example, on the gearbox flange 30, on the flange neck 12, on the gearbox housing 32 and / or on a separate, housing-fixed housing element 34 of the handheld power tool 10.
- the counter-abutment 26 can be embodied both as a separate element fastened to the respective component 12, 30, 32, 34 and integrally with the respective component 12, 30, 32, 34.
- the separate, housing-fixed housing element 34 is formed in the embodiments as a provided on or below the transmission flange 30 plate member 48 or as a receivable on the Flanschhals 12 ring member.
- the stop 24 can be adjustably arranged on the protective device 16 and / or the counter-stop 26 adjustable on the housing 14 and / or adjustable on the housing element 34.
- the housing member 34 may be adjustably connected to the housing 14. The connection of the housing element 34 with the housing 14 can take place via projections 36 of the housing element 34 and / or of the housing 14, which can be inserted into recesses 38 of the housing 14 and / or of the housing element 34.
- FIG. 2 shows a device 22a for blocking at least one direction of rotation 18a, 20a of the protective device 16a in a first embodiment.
- a counter-stop 26a provided on the gear flange 30a.
- the counter-stop 26a is formed integrally with the transmission flange 30a, wherein the transmission flange 30a is preferably produced by casting.
- the corresponding stop 24a on the protective device 16a forms the "burst-wheel-stop" at the meeting.
- one end 68a of the tension band 28a is provided as a stop 24a.
- the position of the stop 24a is not necessarily to be seen at one end 68a of the tension band 28a; on the contrary, another meaningful position can also be selected.
- FIG. 3 shows a locking device 22b in a second embodiment.
- the transmission flange 30b is fastened to the transmission housing 32b via screws 76b.
- at least one of these screws 76b is used as a counter-abutment 26b, this counter-abutment 26b being formed "statically" with respect to the "rotating" protective device 16b.
- a gear flange fixing bolt 76b as an elongated, fixed bolt is provided to the rotating need of the protector 16b as a rotation end stopper 26b.
- the counter-abutment 26b collides with the stop 24b arranged on the protective device 16b.
- FIG. 4 shows a locking device 22c in a third embodiment.
- the clamping band 28c on a gear flange 30c facing end face 44c on a bead or a perpendicular to the clamping band 28c at least partially over the circumference of the clamping band 28c extending edge 78c, which is overlapped by the formed as a hook counter-stop 26c.
- the housing-fixed counter-abutment 26 c additionally serves as a hold-down for the protective device 16 c, by holding the protective device 16 c via a positive connection in the axial operating position.
- FIG. 5 shows a partially illustrated locking device 22d in a fourth embodiment.
- a housing element 34d designed as an annular plate element is screwed onto the gearbox flange 30d, wherein any further meaningful manner of fastening would also be conceivable.
- a plurality of threads 80d are concentric with an axis 56d arranged the output shaft, wherein a trained as a bolt counter-stop 26d can be mounted, wherein the counter-stop 26d may also be otherwise attached to the housing member 34d. Due to the different thread positions, a sensible burst-wheel stop position can be selected for the user.
- the protection device-resistant counter-stop can thus be intercepted in manufacturer or user-desired positions in the burst-wheel case.
- the housing element can also be designed as a ring segment 34e FIG. 6 be executed.
- FIG. 6 shows a part of a locking device 22e in a fifth embodiment.
- the trained as a sheet metal part ring segment 34e a Hakenausklinkung 26e impressed.
- This notch serves the protective device after bending as a counter-stop 26e.
- the variation of the position of the counter-abutment 26e can be controlled by the choice of the screw-on position of the ring segment 34e.
- a plurality of threads 80e are arranged concentrically to an axis of the output shaft in the ring segment 34e.
- it may be an annular plate member with hook notch instead of the ring segments 34e.
- FIG. 7 shows a partially illustrated locking device 22f in a sixth embodiment.
- a fixedly mounted counter-stop 26f is provided on the annular plate element 34f.
- the annular plate member 34f has a plurality of peripheral screw holes 80f.
- the housing element 34f is adjustably fastened to the housing 14f or to the gear flange 30f via these screw holes 80f.
- the position of the housing-fixed counter-stop 26f can be influenced.
- a variation of the screw holes, not shown here is executable by these are made to slots, whereby an adjustment can be performed by simply loosening the screws.
- FIG. 8 shows a partially illustrated locking device 22g in a seventh embodiment.
- a designed as an annular insert housing member 34g is placed on the gear flange 30g.
- This insert 34g has projections 36g, which are seated in corresponding recesses 38g in the gear flange 30g and force a positional fixation of the insert 34g on the gear flange 30g.
- An erected hook or pin of the insert 34g forms a counter-abutment 26g opposite the rotating guard. Both the projections 36g and the hook 26g of the insert 34g may be referred to as Notches be executed. Further, the counter-stop 26g can be adjustably mounted on the insert 34g.
- FIG. 9 shows a partially illustrated locking device 22h in an eighth embodiment.
- the insert 34h has an upwardly rising, formed as a hook counter-stop 26h. This hook 26h forms the stop or casserole situation by means of a stop in the protective device, not shown here.
- the device 22 for blocking may preferably have at least one damping device 40, wherein the counter-stop 26 and / or the stop 24 has the damping device 40 and / or is designed as a damping device 40.
- FIG. 10 shows a partially illustrated locking device 22i in a ninth embodiment.
- a counter-stop 26i which is attached to the gearbox flange 30i and is preferably screwed on is provided, which has a stopper base 82i which is open at an end face and has a recess 84i for receiving the damping device 40i.
- the main body 82i of the counter-abutment 26i is equipped with the damping device 40i to be integrated in the recess 84i, such as a rubber buffer 40i 'or a coil spring 40i.
- FIGS. 11 and 12 show two other alternatives of the counter-attack 26i ', 26i " FIG. 11 is the counter-stop 26i 'itself as a damping device 40i' executed by the preferably one-piece counter-stop 26i 'is designed plastically or elastically deformable, with any deformation can be made permanent or non-permanent. A permanent deformation would basically have the advantage that a burst-wheel incident could be detected for the tool manufacturer.
- FIG. 12 is the counter-stop 26i "also implemented as a damping device 40i", namely as a plastically deformable sheet metal element.
- FIG. 13 shows a part of a locking device 22j in a tenth embodiment.
- an integrally formed on the clamping band 28j and thus integrated into the protection device 16j stop 24j is provided, which is designed as a damping device 40j.
- a non-integral and thus mounted stop with damping device would also be conceivable.
- the stop 24j forming the damping device 40j is a folding element in which the kinetic energy in a burst-wheel case is broken down by the permanent or resilient deformation of the folding element. Again, it should be noted that a permanent deformation has the advantage that a burst-wheel incident can be detected.
- FIGS. 14 to 17 show locking devices 22, in which the housing-fixed counter-stop 26 is provided on the flange neck 12.
- FIG. 14 shows a partially illustrated locking device 22k in an eleventh embodiment.
- the housing-fixed counter-stop 26k is provided on a housing element 34k connected to the flange neck 12k.
- the housing member 34k is formed as a ring member receivable on the flange neck 12k.
- the pushed onto the Flanschhals 12k ring member 34k is provided with a hook designed as a counter-stop 26k, which is held positively in a recess 86k of the gear flange 30k.
- the stop, not shown here, of the protection device runs on the stop hook 26k.
- FIG. 15 shows a locking device 221 in a twelfth embodiment.
- the counter-stop 261 is provided on an end face 881 of the flange neck 121.
- the counter-abutment 261 is preferably provided on the flange neck 121 via a plurality of threaded holes 901, it being understood that a fixed arrangement of the counter-abutment would also be conceivable.
- the cooperating with the counter-stopper 261 stop 241 is provided on an inner side 421 of the clamping band 281, preferably as a notched or shaped hook.
- the attack can be carried out according to FIG. 16 Of course, be provided as a separate part 241 'on the strap 281'.
- FIG. 17 shows an alternative counter-abutment 261 'on the end face 881' of the flange neck 121 ', which is integrated in the Flanschhals 121'.
- Stops may be designed such that they lock a rotation of the protective device 16 in a direction of rotation 18 or 20, while in the opposite direction 20 or 18, a locking of the protective device 16 is allowed.
- FIG. 18 shows a partially illustrated locking device 22m in a thirteenth embodiment.
- the counter-abutment 26m is sprung in a direction of a longitudinal axis 92m, mounted on the end face 88m of the flange neck 12m.
- it has a deflection in the direction of rotation 18m or 20m extending 94m.
- the guard-fixed counter-abutment 26m in a twisting direction 18m or 20m overrun the spring-loaded, provided with fold 94m counter-stop 26m by the counter-stop 26m is pushed back in the longitudinal direction 92m, while the protective device stopped 16m in the opposite direction 20m or 18m stop becomes.
- the stop 24 is formed as at least one nose which engages in a formed as a counter-stop groove 26, wherein the nose 24 is provided on an inner side 42 and / or on an end face 44 of a clamping band 28 of the protective device 16 and the groove 26 is formed by a on an outer circumference of the flange neck 12 and / or in the gear flange 30 extending, in the circumferential direction 18, 20 limited recess.
- the boundary 48 of the groove 26 is formed by an inserted into the groove 26 element, provided on the disc member 34 tab or provided on the plate member 34 protuberance.
- FIG. 19 shows a locking device 22n in a fourteenth embodiment.
- a groove serving as a counter-stop 26n is provided on the flange neck 12n, which is formed by a recess 26n extending on an outer circumference of the flange neck 12n and bounded in the circumferential direction 18n, 20n.
- FIG. 20 to 21 show alternative limitations 48n ', 48n "of an annular groove 26n' encircling the flange neck 12n ' FIG. 20 the annular groove interruption is achieved by inserting a limiting element 48n 'into a recess of the flange neck 12n'.
- the FIG. 21 shows a limiting element 48n "in an alternative form Stop position can also be provided more limiting elements on the circumference of the flange neck.
- FIG. 22 shows a locking device 22o in a fifteenth embodiment.
- a serving as a counter-stop 26o groove on Flanschhals 12o is provided, which is formed by a recess 26o, which extends limited in the peripheral periphery in an edge region of the flange neck 12o in the circumferential direction 18o, 20o, wherein the recess 22o not only to the outside, but also open to the top.
- FIG. 23 shows a partially illustrated locking device 22p in a sixteenth embodiment.
- the groove 26p is formed by the flange neck 12p and a disk member 34p fitted to the flange neck 12p, in which the flange neck 12p has a larger diameter lower portion 96p and a smaller diameter upper portion 98p, and the flange neck 12p patch disk element 34p has a larger diameter than the upper portion 98p of the flange neck 12p.
- the boundary of the groove 26p is formed by a tab 48p provided on the disc member 34p, which extends toward the lower portion 96p of the flange neck 12p.
- the disc member 34p is connected via two rivet pins 100p with the Flanschhals 12p, with other useful attachment types are conceivable. If there are a plurality of rivet bolt holes arranged concentrically with the shaft 56p of the drive shaft, the disk member 34p can be put on the flange neck 12p at various positions, whereby a stopper position can be put "forward" or "back” by the manufacturer.
- FIG. 24 shows a locking device 22q in a seventeenth embodiment.
- the housing-fixed groove 26q is then limited, so that in the burst-wheel case the protective device-fixed nose 24q abuts the boundary 48q and the rotation stops.
- FIG. 25 shows a locking device 22r in an eighteenth embodiment.
- the groove serving as a counter stop 26r is provided on a housing element 34r, which is a plate element 34r provided on the gear flange (not shown here).
- the groove 26r is formed by the flange neck (not shown) and the gear flange-mounted plate member 34r pushed onto the flange neck by the plate member 34r having an opening 102 whose diameter is larger than the diameter of the flange neck.
- the groove 26r is formed between the flange neck and the plate element 34r, which groove is delimited by a protuberance 48r provided on the plate element 34r in the circumferential direction.
- This variant is very suitable for retrofitting a hand tool.
- FIG. 26 shows a partially illustrated locking device 22s in a nineteenth embodiment.
- the counter-stop 26s is arranged on the transmission housing 32s.
- the counter-stop 26s is integrated in the transmission housing 32s.
- the counter-stop can also be mounted as a separate component to the transmission housing.
- the Figures 27a and 27b show a partially illustrated device 22t for locking in one of the FIGS. 2 to 26 another embodiment.
- a counter stop 26t of the locking device 22t is disposed on a gear flange 30t of a portable power tool.
- the counter stop 26t is formed as a separate component to the gear flange 30t and screwed in a mounted state with the gear flange 30t.
- the locking device 22t has a receiving unit 104t disposed on the transmission flange 30t and provided for receiving the counter-stop 26t.
- the receiving unit 104t has a recess 106t on the transmission flange 30t ( FIGS. 29a and 29b ).
- the recess 106t and the receiving unit 104t are disposed on a base member 120t of the gear flange 30t, wherein the base member 120t extends outward in a radial direction 110t from a flange neck 12t and substantially perpendicular to the flange neck 12t and an axis 56, respectively Output shaft 52 is aligned.
- the recess 106t is disposed in a radially outer edge portion 124t of the base member 120t and extends in a twisting direction 18t, 20t along a portion of the flange neck 12t (see FIG. Figures 27a, 27b . 29a and 29b ).
- the recess 106t is also tapered in a rotational direction 126t of a tool formed by a grinding wheel 54.
- the recess 106t is arranged in the region 128t of a fastening recess 130t for fastening the gearbox flange 30t to a gearbox housing 32 of the handheld power tool, as well that at an attachment of the counter-stop 26t with the gear flange 30t this is attached to the transmission housing 32 at the same time.
- the counter-stop 26t has a recess 132t ( Figures 28a and 28b ), through which a fastening screw engages in a mounted state 134t and is screwed to the transmission housing 32 ( Figures 27a and 27b ).
- the fastening screw 134t is in this case formed by a countersunk screw, so that upon a rotational movement of a protective device 16t together with the stop 24t, the stop 24t can hit the counter-abutment 26t unhindered on account of a momentum transfer of an outwardly thrown tool part of a broken tool ( FIGS. 30a and 30b ).
- the receiving unit 104t has two supporting elements 108t, 112t, which are provided for supporting the counterstop 26t in the case of a bursting tool ( Figures 27a, 27b . 29a and 29b ).
- One of the two support elements 108t is provided for supporting the counter-abutment 26t in the direction of rotation 18t or in the direction of rotation 126t of the tool and arranged in the direction of rotation 18t or in the direction of rotation 126t at a tapered end 136t of the recess 106t and from a radially in the direction 110t extending web 114t formed.
- the further support element 112t is provided for supporting the counterstop 26t in a radial direction 110t.
- the support element 112t is formed by a wall which extends along the direction of rotation 18t, 20t or the direction of rotation 126t on a radially outer edge 110t, the recess 106t surrounding edge 138t of the base member 120t.
- the two support elements 108t, 112t are integrally formed with each other and also formed integrally with the base member 120t and with the gear flange 30t ( Figures 27a, 27b, 29a and 29b).
- the support element 112t for supporting the counterstop 26t in the radial direction 110t has, along the axis 56 of the output shaft 52, a height 150t that is at most as high as a height 152t of a portion 140t of the flange neck 12t facing the base body 120t.
- the base body 120t facing portion 140t of the flange neck 12t is bounded along the axis 56 by a direction of rotation 18t, 20t on the Flanschhals 12t circumferential groove 142t, which is provided to guide a coding element of the protection device not shown, wherein the groove 142t through a subsequent processing of the gear flange 30t, as can be introduced, for example, by a turning process.
- the counter-abutment 26t has a main body 144t, which has a tapered shape of the recess 106t and is disposed therein in an assembled state, and a stopper member 146t (see FIG. FIGS. 27a to 28b ).
- the stopper member 146t is disposed in a tapered portion 148t of the main body 144t.
- the stop element 146t also has a height 154t which is higher than a height 150t of the support member 112t, so that the stopper 24t can hit the abutment member 146t of the counterstop 26t.
- the stop 24t is formed by a closure element 162t of the clamping unit 66t formed by a nut, wherein the nut is screwed together with a closure element 166t formed by a clamping screw 164t in an assembled state of the protective device 16t.
- a clamping screw end 168t of the clamping screw 164t facing the counter-stop 267t can be guided past the counter-stop 26t due to the small height 150t of the supporting element 112t, so that only the stop 24t of the clamping unit 66t formed by the nut moves in the direction of rotation 126t when the protective device 16t is undesirably rotated of the tool due to an outwardly thrown and hit on the protective device 16t tool part of the ruptured tool on the counter-stop 26t strikes or hits (see FIGS. 30a and 30b ).
- the abutment member 146t of the counter-abutment 26t abuts against the support member 112t in the radial direction 110t outwardly on the support member 112t and on the support member 108t in the twisting direction 18t and in the rotational direction 126t, respectively, in an assembled state with the transmission flange 30t, so that upon impact the abutment 53 of the protective device 16 is supported on the gearbox flange 30t via the receiving unit 104t due to a ruptured tool with the counter-abutment 26t, and forces transmitted to the counter-abutment 26t can be dissipated via the gearbox flange 30t.
- the counter-abutment 26t is formed by a different material to the transmission flange 30t, such as an energy-absorbing material.
- the counter stop 26t and the gear flange 30t are formed integrally with one another, namely as a component, and / or the counter stop 26t and the gear flange 30t are formed or made of a same material.
- the stop element 146t of the counter-stop 26t has a recess 116t, which is arranged in an impact area 118t when the stop 24t strikes the counter-stop 26t ( Figures 28a, 28b . 30a and 30b ).
- the indentation 116t is arranged on an outer edge region 156t of the stop element 146t in the radial direction 110t and, in an assembled state of the counterstop 26t, extends with the gearbox flange 30t from an end region 158t facing away from the main body 144t to an end region 160t of the support element facing away from the main body 144t 112t.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Grinding-Machine Dressing And Accessory Apparatuses (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Gear Transmission (AREA)
- Harvester Elements (AREA)
Description
Die Erfindung geht aus von einer Handwerkzeugmaschine nach dem Oberbegriff des Anspruchs 1.The invention relates to a hand tool according to the preamble of claim 1.
Aus der
Die Erfindung geht aus von einer Handwerkzeugmaschine, insbesondere einem Winkelschleifer, wie sie bereits aus der
Die Schutzvorrichtung gemäß Anspruch 1 soll den Benutzer der Handwerkzeugmaschine bei einem eventuellen Bersten der Schleifscheibe, einem so genannten "burst-wheel-Fall" gegen Verletzungen schützen. Üblicherweise versetzt eine gebrochene Schleifscheibe die Schutzvorrichtung in Rotation. Die erfindungsgemäße Vorrichtung ermöglicht im Notfall bzw. "burst-wheel-Fall" ein Verdrehen der Schutzvorrichtung energievermindernd an einer definierten Stelle zu stoppen. Die Anschläge stellen die letztmögliche und gewünschte Drehposition der Schutzvorrichtung dar. Die erfindungsgemäße Ausgestaltung der Handwerkzeugmaschine ermöglicht die Herstellung einer einfachen und kostengünstigen Sperrvorrichtung. Es ist keine zusätzliche separate Sperrvorrichtung notwendig, da nur die für das Sperren der Schutzvorrichtung notwendigen Bauteile an Teilen der Handwerkzeugmaschine vorzusehen sind.The protective device according to claim 1, the user of the power tool in case of a possible bursting of the grinding wheel, Protect against injuries in a so-called burst-wheel case. Typically, a broken grinding wheel will set the guard in rotation. The device according to the invention makes it possible, in an emergency or "burst-wheel case", to prevent rotation of the protective device to reduce energy at a defined point. The stops represent the last possible and desired rotational position of the protective device. The embodiment of the portable power tool according to the invention makes it possible to produce a simple and cost-effective locking device. There is no additional separate locking device necessary, since only necessary for the locking of the protective device components are provided on parts of the power tool.
Erfindungsgemäß sind die Anschläge derart ausgestaltet, dass im Notfallbetrieb ein Verdrehen der Schutzvorrichtung in mindestens einer Verdrehrichtung nur bis zu einer vorbestimmten Drehposition ermöglicht ist. Die Vorrichtung ermöglicht im Notfallbetrieb zunächst eine Rotationsbewegung der Schutzvorrichtung gegenüber dem Gehäuse bis dann der Anschlag und der Gegenanschlag aufeinander treffen. In diesem Zusammenhang soll unter "Normalbetrieb" ein Betrieb einer Handwerkzeugmaschine verstanden werden, bei dem nur Energie von mit der Schutzvorrichtung in Kontakt kommenden Teilen, bis zu einem vorgegebenen Wert auf die Schutzvorrichtung einwirkt. Unter "Notfallbetrieb" soll ein Betrieb der Handwerkzeugmaschine verstanden werden, bei dem Energie von mit der Schutzvorrichtung in Kontakt kommenden Teilen oberhalb des vorgegebenen Wertes auf die Schutzvorrichtung einwirkt. Die Schutzvorrichtung ist vorzugsweise um ein scheibenförmiges und rotierendes Werkzeug einer Handwerkzeugmaschine, wie beispielsweise einen Winkelschleifer, angeordnet, so dass durch die Schutzvorrichtung im Betrieb der Handwerkzeugmaschine Funken und/oder Materialpartikel und/oder insbesondere rotierende und/oder mit großer Wucht nach außen geschleuderte Bruchstücke einer im Betrieb zerborstenen Scheibe, wie beispielsweise einer Schleifscheibe, einer Trennscheibe usw., vorteilhaft abgebremst werden können bzw. eine Energie, insbesondere eine Bewegungsenergie der Partikel reduziert werden kann. Die Vorrichtung zum Sperren mindestens einer Verdrehrichtung der Schutzvorrichtung ist so ausgeführt, dass die Schutzvorrichtung beim Aufschlagen von Werkzeugbruchstücken Energie absorbiert, indem die Schutzvorrichtung zunächst eine Rotationsbewegung bzw. Drehbewegung zum Gehäuse der Handwerkzeugmaschine ausführt. Durch die Spannvorrichtung wird zwischen Flanschhals und Schutzvorrichtung mittels Presspassung ein Reibschluss erzeugt. Vorteilhafterweise ist die Spannvorrichtung derart ausgelegt, dass es bei Einleitung eines Energiestoßes mit einem vorgebbaren Wert in die Schutzvorrichtung zu der Rotationsbewegung der Schutzvorrichtung gegenüber dem Gehäuse kommt. Hierdurch ist die Schutzvorrichtung im Normalbetrieb, d.h. bei einem Energiestoß unterhalb des vorgegebenen Wertes, fest mit dem Flanschhals bzw. mit dem Gehäuse gekoppelt und führt erst im Notfallbetrieb, d.h. bei einem Energiestoß oberhalb des vorgebbaren Wertes, eine Rotationsbewegung gegenüber dem Flanschhals bzw. Gehäuse aus. Nach Einleitung des Energiestoßes beim Bersten des Werkzeugs wird die Haftreibung zwischen Flanschhals und Schutzvorrichtung überwunden, und die beiden Bauteile können um einen bestimmten Winkelbereich eine Relativbewegung zueinander ausführen. Dadurch wird ein gewisser Teil der Energie absorbiert und die Geschwindigkeit der aus der Schutzvorrichtung austretenden Bruchstücke vermindert.According to the invention, the stops are designed such that in emergency operation, a rotation of the protective device in at least one direction of rotation is only possible up to a predetermined rotational position. In emergency operation, the device initially allows a rotational movement of the protective device relative to the housing until the stop and the counter-stop meet one another. In this context, "normal operation" is understood to mean the operation of a handheld power tool in which only energy from parts in contact with the protective device acts on the protective device up to a predetermined value. "Emergency operation" is to be understood as meaning operation of the handheld power tool in which energy of parts in contact with the protection device acts on the protection device above the predetermined value. The protective device is preferably arranged around a disc-shaped and rotating tool of a hand tool, such as an angle grinder, so that by the protective device during 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 sliced in operation disc, such as a grinding wheel, a cutting disc, etc., can be advantageously slowed down or an energy, in particular a kinetic energy of the particles can be reduced. The device for blocking at least one direction of rotation of the protective device is designed so that the protective device absorbs energy when breaking tool fragments by the protective device first performs a rotational movement or rotational movement to the housing of the power tool. The clamping device generates a frictional connection between the flange neck and the protective device by means of a press fit. Advantageously, the clamping device is designed such that it comes at the initiation of a power surge with a predetermined value in the protection device to the rotational movement of the protective device relative to the housing. As a result, the protective device in normal operation, ie at a power surge below the predetermined value, fixedly coupled to the flange neck or to the housing and performs only in emergency operation, ie at a power surge above the predetermined value, a rotational movement relative to the flange neck or housing. After initiation of the energy impact when bursting the tool, the static friction between flange neck and protective device is overcome, and the two components can perform a relative movement to each other by a certain angular range. This absorbs some of the energy and reduces the velocity of the fragments leaving the guard.
Es wird vorgeschlagen, dass die Anschläge derart ausgestaltet sind, dass diese ein Verdrehen der Schutzvorrichtung in eine Verdrehrichtung verhindern und ein Verdrehen der Schutzvorrichtung in die entgegengesetzte Verdrehrichtung ermöglichen. Vorteilhafterweise ist damit nur die Verdrehrichtung gesperrt, in welche die Schutzvorrichtung im Notfallbetrieb unkontrolliert rotieren würde. In der Gegenrichtung ist ein Verdrehen bzw. Durchrasten der Schutzvorrichtung möglich.It is proposed that the stops are designed such that they prevent twisting of the protective device in a direction of rotation and allow rotation of the protective device in the opposite direction of rotation. Advantageously, thus only the direction of rotation is locked, in which the protective device would rotate uncontrollably in an emergency operation. In the opposite direction twisting or locking of the protective device is possible.
Des Weiteren wird vorgeschlagen, dass der Anschlag schutzvorrichtungsfest und der Gegenanschlag gehäusefest an der Handwerkzeugmaschine angeordnet ist. Der schutzvorrichtungsfeste Anschlag wird bei einer Bewegung der Schutzvorrichtung gegenüber der übrigen Handwerkzeugmaschine mit der Schutzvorrichtung mitbewegt, während der gehäusefeste Anschlag ortsfest gegenüber der Handwerkzeugmaschine bleibt. Im Folgenden wird der gehäusefeste Anschlag auch als "statischer" Anschlag und der schutzvorrichtungsfeste Anschlag auch als "bewegter" Anschlag bezeichnet. Vorteilhafterweise ist hierdurch die Relativbewegung der Schutzvorrichtung gegenüber dem Gehäuse zu unterbrechen und die Anschläge sind als so genannte "burst-wheel-Sicherung" nutzbar. Die Anschläge lassen eine Relativbewegung der Schutzvorrichtung gegenüber dem Gehäuse der Handwerkzeugmaschine soweit zu, bis der "statische" Anschlag am Gehäuse und der "bewegte" Gegenanschlag an der Schutzvorrichtung aufeinander treffen. Ein Werkzeughersteller hat somit die Möglichkeit die burst-wheel-Anschläge in einer geeigneten und für den Anwender sicheren Position zu bestimmen. Diese Position kann einen größtmöglichen zulässigen Verdrehwinkel der Schutzvorrichtung zulassen, dies jedoch unter Berücksichtigung, dass bei einem Bersten der Scheibe der Anwender nicht verletzt wird. Falls ein Anwender die Position der burst-wheel-Anschläge selbst wählen kann, so kann vom Werkzeughersteller eine Kodierung der zulässigen Positionen vorgenommen werden.Furthermore, it is proposed that the stop protection device fixed and the counter-stop is fixed to the housing fixed to the power tool. The protective device fixed stop is moved with a movement of the protective device relative to the other hand tool with the protective device, while the housing-fixed stop remains stationary relative to the power tool. In the following, the housing-fixed stopper is also referred to as a "static" stop and the guard fixed stop also as a "moving" stop. Advantageously, this is to interrupt the relative movement of the protective device relative to the housing and the attacks can be used as a so-called "burst-wheel-fuse". The stops allow relative movement of the protective device relative to the housing of the power tool until the "static" stop on the housing and the "moved" counter-stop on the protective device meet. A tool manufacturer thus has the opportunity to determine the burst-wheel stops in a suitable and safe for the user position. This position can allow a maximum allowable twist angle of the protection device, but taking into account that in a bursting of the disc, the user is not injured. If a user can choose the position of the burst-wheel stops himself, then the tool manufacturer can encode the permissible positions.
Es wird vorgeschlagen, dass der Anschlag an einem Spannband der Schutzvorrichtung vorgesehen ist. Dies ermöglicht eine einfache, kostengünstige Herstellung bei leichter Zugänglichkeit des Anschlags. Die Anordnung des Anschlags am Spannband der Schutzvorrichtung bewirkt ein optimales Zusammenspiel mit einem am Gehäuse angeordneten Gegenanschlag.
Weitere Bauteile, Bauraum, Montageaufwand und Kosten können vorteilhaft eingespart werden, wenn der Anschlag zumindest teilweise von einem Verschlusselement, wie beispielsweise von einer Spannschraube, einer Mutter, einem Spannhebel und/oder weiteren, dem Fachmann als sinnvoll erscheinenden Verschlusselementen, gebildet ist.It is proposed that the stop is provided on a strap of the protective device. This allows a simple, inexpensive production with easy accessibility of the attack. The arrangement of the stop on the strap of the protective device causes an optimal interaction with a counter-stop arranged on the housing.
Other components, space, assembly costs and costs can be advantageously saved when the stop is at least partially formed by a closure element, such as a clamping screw, a nut, a clamping lever and / or further, the expert appears useful as closure elements.
Des Weiteren wird vorgeschlagen, dass der Gegenanschlag an einem Getriebeflansch, am Flanschhals, an einem Getriebegehäuse und/oder an einem Gehäuseelement vorgesehen ist. Hierbei können vorteilhafterweise bereits vorhandene Elemente, wie beispielsweise Schrauben zur Befestigung des Getriebeflansches am Getriebegehäuse zusätzlich als Gegenanschlag ausgestaltet und mitverwendet werden. Zudem ist es auch denkbar, dass der Gegenanschlag einstückig mit dem Getriebeflansch, dem Flanschhals, dem Getriebegehäuse und/oder dem Gehäuseelement ausgebildet ist. Ferner ist die Vorrichtung zum Sperren, insbesondere der Gegenanschlag der Schutzvorrichtung zum Sperren, dabei vorteilhafterweise dazu vorgesehen, nachträglich an dem Getriebeflansch, dem Flanschhals, dem Getriebegehäuse und/oder dem Gehäuseelement der Handwerkzeugmaschine integriert zu werden.Furthermore, it is proposed that the counter-stop is provided on a gear flange, on the flange neck, on a gear housing and / or on a housing element. In this case, advantageously already existing elements, such as screws for mounting the gear flange on the gear housing can also be designed as a counter-stop and used. In addition, it is also conceivable that the counter-stop is formed integrally with the gear flange, the flange neck, the gear housing and / or the housing element. Furthermore, the device for locking, in particular the counter-stop of the protective device for locking, thereby advantageously provided to be subsequently integrated on the gear flange, the flange neck, the gear housing and / or the housing element of the power tool.
Ferner wird vorgeschlagen, dass das Gehäuseelement als ein auf oder unter dem Getriebeflansch vorgesehenes Element oder als ein auf dem Flanschhals aufnehmbares Element ausgebildet ist. Vorteilhafterweise ist hierdurch jede erdenkliche Position des Gehäuseanschlags umsetzbar.It is also proposed that the housing element is designed as an element provided on or under the gearbox flange or as an element which can be accommodated on the flange neck. Advantageously, any conceivable position of the housing stop can be implemented thereby.
Vorteilhafterweise sind der Anschlag verstellbar an der Schutzvorrichtung und/oder der Gegenanschlag verstellbar am Gehäuse und/oder am Gehäuseelement angeordnet. Hierdurch besteht die Möglichkeit die burst-wheel-Anschläge in einer geeigneten und für den Anwender sicheren Position zu bestimmen. Diese Position kann einen größtmöglichen zulässigen Verdrehwinkel der Schutzvorrichtung zulassen, dies jedoch unter Berücksichtigung, dass bei einem Bersten der Scheibe der Anwender nicht verletzt wird. Falls ein Anwender die Position der burst-wheel-Anschläge selbst wählen kann, so kann vom Werkzeughersteller eine Kodierung der zulässigen Positionen vorgenommen werden, beispielsweise über vorgegebene Gewindelöcher für einen einschraubbaren Anschlagsbolzen.Advantageously, the stop are adjustably arranged on the protective device and / or the counter-stop adjustable on the housing and / or on the housing element. This makes it possible to determine the burst-wheel stops in a suitable and safe for the user position. This position can allow a maximum allowable twist angle of the protection device, but taking into account that in a bursting of the disc, the user is not injured. If a user can select the position of the burst-wheel stops themselves, then the tool manufacturer can encode the permissible positions, for example via predetermined threaded holes for a screw-in stop pin.
Ferner wird vorgeschlagen, dass das Gehäuseelement verstellbar mit dem Gehäuse verbunden ist. Vorteilhafterweise ist über das am Gehäuse verstellbare Gehäuseelement automatisch auch der Gegenanschlag verstellbar ausgebildet. Die Variation der Anschlagsposition kann durch die Wahl der Position des Gehäuseelements am Gehäuse ohne zusätzlichen Aufwand gesteuert werden.
Es wird vorgeschlagen, dass die Verbindung des Gehäuseelements mit dem Gehäuse über Vorsprünge des Gehäuseelements und/oder des Gehäuses erfolgt, welche in Aussparungen des Gehäuses und/oder des Gehäuseelements einlegbar sind. Nach dem Aufbringen und Befestigen der Schutzvorrichtung auf dem Flanschhals ist das Gehäuseelement auf dem Getriebeflansch fixiert. Durch die Integration der Befestigung in die vorhandenen Bauteile, kann auf zusätzliche Befestigungsmittel verzichtet werden, wodurch sich eine kostengünstigere Herstellung der Handwerkzeugmaschine ergibt. Zudem ist dieses Gehäuseelement vorteilhafterweise als Nachrüstteil vorstellbar.It is also proposed that the housing element is adjustably connected to the housing. Advantageously, the counter-stop is automatically adjustable via the adjustable housing on the housing element. The variation of the stop position can be controlled by the choice of the position of the housing member on the housing without additional effort.
It is proposed that the connection of the housing element to the housing takes place via projections of the housing element and / or of the housing, which can be inserted into recesses of the housing and / or of the housing element. After applying and attaching the protection device on the flange neck, the housing element is fixed on the transmission flange. By integrating the attachment in the existing components, can be dispensed with additional fasteners, resulting in a more cost-effective production of the power tool. In addition, this housing element is advantageously conceivable as a retrofit.
Ferner wird vorgeschlagen, dass die Vorrichtung zum Sperren mindestens eine Dämpfungseinrichtung aufweist. Üblicherweise wird nach der Einleitung des Energiestoßes beim Bersten des Werkzeugs die Haftreibung zwischen Flanschhals und Schutzvorrichtung überwunden, und die beiden Bauteile können vorteilhafterweise um einen bestimmten Winkelbereich eine Relativbewegung zueinander ausführen bis die Anschläge aufeinander treffen. Dadurch wird bereits ein gewisser Teil der Energie absorbiert und die Geschwindigkeit der aus der Schutzvorrichtung austretenden Bruchstücke vermindert. Vorteilhafterweise wirkt nun die Dämpfungseinrichtung zusätzlich energieabsorbierend.It is also proposed that the device for blocking has at least one damping device. Usually, after the initiation of the energy impact when the tool ruptures, the static friction between the flange neck and the protective device is overcome, and the two components can advantageously perform a relative movement relative to one another until the stops strike one another. As a result, some of the energy is already absorbed and the speed of the fragments emerging from the protective device is reduced. Advantageously, the damping device now additionally acts to absorb energy.
Es wird vorgeschlagen, dass der Gegenanschlag und/oder der Anschlag die Dämpfungseinrichtung aufweist und/oder als Dämpfungseinrichtung ausgebildet ist. Hierdurch kann mittels geeigneter Wahl der Position und/oder des Materials und/oder der Gestaltung des Anschlags eine optimale Dämpfungswirkung und dadurch Energieabsorption erzielt werden. Ist als Anschlag ein Grundkörper mit einer austauschbaren Dämpfungseinrichtung vorgesehen, so kann die Dämpfungseinrichtung jederzeit sowohl vom Hersteller als auch vom Kunden auf den Anwendungsfall abgestimmt werden.It is proposed that the counter-stop and / or the stop has the damping device and / or is designed as a damping device. In this way, by means of a suitable choice of the position and / or the material and / or the design of the stop an optimal damping effect and thereby energy absorption can be achieved. If a main body with a replaceable damping device is provided as a stop, then the damping device can be adapted to the application at any time both by the manufacturer and by the customer.
Ebenfalls wird vorgeschlagen, dass der Anschlag als mindestens eine Nase ausgebildet ist, welche in eine als Gegenanschlag ausgebildete Nut eingreift. Diese Ausgestaltung ermöglicht eine einfache und kostengünstige Herstellung der Sperrvorrichtung, da nur mehr eine Nut und eine Nase in einem Bauteil der Handwerkzeugmaschine vorzusehen sind.It is also proposed that the stop is designed as at least one nose, which engages in a groove formed as a counter-stop. This embodiment allows a simple and cost-effective production of the locking device, since only one more groove and a nose are provided in a component of the power tool.
Ferner wird vorgeschlagen, dass die Begrenzung der Nut durch ein in die Nut eingeschobenes Element, eine an dem Scheibenelement vorgesehene Lasche oder eine an dem Plattenelement vorgesehene Ausstülpung gebildet ist. Diese Ausgestaltungen ermöglichen sowohl einen festen als auch einen verstellbaren Gegenanschlag am Gehäuse.It is also proposed that the boundary of the groove is formed by an inserted into the groove element, provided on the disc element tab or provided on the plate member protuberance. These embodiments allow both a fixed and an adjustable counter-stop on the housing.
Es wird vorgeschlagen, dass der gehäusefeste Gegenanschlag zusätzlich als Niederhalter für die Schutzvorrichtung dient. Vorteilhafterweise erfüllt hierbei ein Bauteil zwei Funktionen.It is proposed that the housing-fixed counter-stop additionally serves as a hold-down for the protection device. Advantageously, a component fulfills two functions.
In einer vorteilhaften Weiterbildung der Erfindung wird vorgeschlagen, dass die Vorrichtung zum Sperren zumindest eine Aufnahmeeinheit aufweist, die an einem Getriebeflansch angeordnet ist und zu einer Aufnahme des Gegenanschlags vorgesehen ist, wodurch eine besonders vorteilhafte, insbesondere stabile Anordnung bzw. Aufnahme des Gegenanschlags an dem Getriebeflansch erreicht werden kann. Vorzugsweise ist die Aufnahmeeinheit hierbei dazu ausgelegt, Kräfte, die von einer sich in Verdrehrichtung bewegenden Schutzvorrichtung aufgrund eines auf die Schutzvorrichtung treffenden Werkzeugteils eines berstenden Werkzeugs über den Gegenanschlag übertragen werden, aufzunehmen bzw. den Gegenanschlag gegen diese Kräfte zu einem Schutz eines Bedieners der Handwerkzeugmaschine abzustützen.In an advantageous development of the invention it is proposed that the device for locking has at least one receiving unit which is arranged on a transmission flange and is provided for receiving the counter-stop, whereby a particularly advantageous, in particular stable arrangement or recording of the counter-attack on the transmission flange can be achieved. In this case, the receiving unit is preferably designed to receive forces which are transmitted by the protective device moving in the direction of rotation due to a tool part of a bursting tool being transmitted via the counter-stop or to support the counter-stop against these forces to protect an operator of the hand-held power tool ,
Weiterhin wird vorgeschlagen, dass die Aufnahmeeinheit zumindest eine Aussparung an dem Getriebeflansch aufweist, die zur Aufnahme des Gegenanschlages vorgesehen ist, wodurch eine konstruktiv einfache Aufnahme des Gegenanschlags an dem Getriebeflansch realisiert werden kann. Vorzugsweise ist eine Form der Aussparung passgenau an eine Form des Gegenanschlags angeformt, so dass eine insbesondere sichere und spielfreie Anordnung des Gegenanschlags erreicht werden kann.Furthermore, it is proposed that the receiving unit has at least one recess on the gear flange, which is provided for receiving the counter-stop, whereby a structurally simple recording of the counter-attack on the gear flange can be realized. Preferably, a shape of the recess is accurately formed on a shape of the counter-stop, so that a particular safe and play-free arrangement of the counter-attack can be achieved.
Es wird ferner vorgeschlagen, dass die Aufnahmeeinheit zumindest ein Abstützelement aufweist, das den Gegenanschlag in zumindest eine Verdrehrichtung abstützt. Es kann eine stabile Abstützung des Gegenanschlags, insbesondere in eine Rotationsrichtung eines Werkzeugs bei einem Auftreffen des Anschlags auf den Gegenanschlag, erreicht werden und dabei eine Beschädigung des Gegenanschlags zumindest teilweise verhindert werden. Konstruktiv einfach kann dies erreicht werden, wenn das Abstützelement von einem sich in radialer Richtung erstreckenden Steg gebildet ist.It is further proposed that the receiving unit has at least one support element which supports the counter-stop in at least one direction of rotation. It can be a stable support of the counter-attack, in particular in a direction of rotation of a tool in an impact of the stop on the counter-stop, can be achieved while damaging the counter-attack are at least partially prevented. This can be achieved in a structurally simple manner if the support element is formed by a web extending in the radial direction.
Zudem wird vorgeschlagen, dass die Aufnahmeeinheit zumindest ein Abstützelement aufweist, das den Gegenanschlag in zumindest eine radiale Richtung abstützt, wodurch eine vorteilhafte Abstützung des Gegenanschlags nach außen im Falle eines berstenden Werkzeugs erreicht werden kann und ferner insbesondere bei einem Aufprall auftretende Fliehkräfte in radialer Richtung nach außen zum Schutz eines Bedieners abgefangen werden können.In addition, it is proposed that the receiving unit has at least one support element which supports the counter-stop in at least one radial direction, whereby an advantageous support of the counter-stop can be achieved outwardly in the case of a bursting tool and also in particular occurring in an impact centrifugal forces in the radial direction outside to protect an operator can be intercepted.
Es können zudem weitere Bauteile, Bauraum, Montageaufwand und Kosten eingespart werden und es kann zudem eine besonders stabile Anordnung des Abstützelements zur Abstützung des Gegenanschlags in radialer Richtung und/oder des Abstützelements zur Abstützung des Gegenanschlags in zumindest eine Verdrehrichtung an dem Getriebeflansch erzielt werden, wenn das Abstützelement zur Abstützung des Gegenanschlags in radialer Richtung und/oder das Abstützelement zur Abstützung des Gegenanschlags in zumindest eine Verdrehrichtung einstückig mit einem Getriebeflansch ausgebildet ist. In diesem Zusammenhang soll unter "einstückig" dabei insbesondere einteilig, aus einem Guss hergestellt und/oder als ein Bauteil ausgebildet verstanden werden.In addition, other components, space, installation costs and costs can be saved and it can also be a particularly stable arrangement of the support member for supporting the counter-stop in the radial direction and / or the support member for supporting the counter-stop in at least one direction of rotation of the transmission flange can be achieved if the support element for supporting the counter-stop in the radial direction and / or the support element for supporting the counter-stop in at least one direction of rotation is formed integrally with a transmission flange. In this context, the term "in one piece" is to be understood to mean, in particular, in one piece, made of a cast and / or designed as a component.
Ein vorteilhaftes Auswechseln des Gegenanschlags an dem Getriebeflansch kann erreicht werden, wenn der Gegenanschlag an einem Getriebeflansch verschraubbar angeordnet ist. Ist eine Schraube zu einer Befestigung des Gegenanschlags mit dem Getriebeflansch vorzugsweise zugleich zu einer Befestigung des Getriebeflanschs an der Handwerkzeugmaschine bzw. an deren Gehäuse vorgesehen, kann zudem eine besonders kompakte Anordnung und eine insbesondere stabile Befestigung an dem Getriebeflansch erzielt werden. Grundsätzlich ist es zudem jederzeit denkbar, dass der Gegenanschlag bereits an dem Getriebeflansch vormontiert ist und mit dem Getriebeflansch als eine Einheit montierbar ist und/oder mittels einer alternativen, dem Fachmann als sinnvoll erscheinenden Befestigung an dem Getriebeflansch angeordnet ist und/oder besonders vorteilhaft einstückig mit dem Getriebeflansch ausgebildet ist.An advantageous replacement of the counter-stop on the gear flange can be achieved if the counter-stop is screwed to a gear flange. If a screw is provided for attachment of the counterstop to the gearbox flange preferably at the same time for attachment of the gearbox flange to the handheld power tool or to the housing, a particularly compact arrangement and a particularly stable attachment to the gearbox flange can be achieved. In principle, it is also always conceivable that the counter-stop is already preassembled on the transmission flange and is mountable with the transmission flange as a unit and / or by means of an alternative, the expert appears to be useful attachment to the transmission flange and / or particularly advantageous in one piece is formed of the transmission flange.
Des Weiteren wird vorgeschlagen, dass der Gegenanschlag aus einem Material gebildet ist, das unterschiedlich zu einem Material eines Getriebeflansches ausgebildet ist, wodurch Eigenschaften des Gegenanschlags vorteilhaft an eine Energieübertragung bzw. eine Kraftübertragung auf den Gegenanschlag bei Auftreffen des Anschlags im Falle eines berstenden Werkzeugs angepasst werden können. Der Gegenanschlag kann dabei aus einem Material gebildet sein, das bereits einen Teil der auf den Gegenanschlag übertragenen Energie absorbiert und nur einen Teil der Energie auf den Getriebeflansch und/oder die Handwerkzeugmaschine weitergibt.Furthermore, it is proposed that the counter-stop is formed of a material that is different from a material of a gear flange, whereby properties of the counter-stop are advantageously adapted to a power transmission or a power transmission to the counter-attack upon impact of the stop in the case of a bursting tool can. The counter-stop may be formed of a material that already absorbs part of the energy transferred to the counter-stop and only passes on part of the energy to the transmission flange and / or the hand-held power tool.
Es wird ferner vorgeschlagen, dass der Gegenanschlag eine Einbuchtung aufweist, die in einem Auftreffbereich für den Anschlag angeordnet ist, wodurch eine vorteilhafte Aufnahme eines Verschlusselements, insbesondere einer Mutter, die zu einem Verschrauben mit einer Spannschraube vorgesehen ist, in dem Auftreffbereich erreicht werden kann und zudem ein Spannschraubenende vorteilhaft an dem Gegenanschlag vorbeigeführt werden kann.It is further proposed that the counter-stop has a recess which is arranged in an impact area for the stop, whereby an advantageous receiving a closure element, in particular a nut, which is provided for screwing with a clamping screw, can be achieved in the impact area and In addition, a clamping screw end can advantageously be passed to the counter-stop.
Weitere Vorteile ergeben sich aus der folgenden Zeichnungsbeschreibung. In den Zeichnungen sind neunzehn Ausführungsbeispiele der Erfindung dargestellt. Die Figuren, die Beschreibung und die Ansprüche enthalten zahlreiche Merkmale in Kombination. Der Fachmann wird die Merkmale zweckmäßigerweise auch einzeln betrachten und zu sinnvollen weiteren Kombinationen zusammenfassen.Further advantages emerge from the following description of the drawing. In the drawings, nineteen embodiments of the invention are shown. The figures, 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.
Es zeigen:
- Fig. 1
- in einer Explosionsdarstellung eine ausschnittsweise dargestellte Handwerkzeugmaschine mit einer in Umfangsrichtung verdrehbaren Schutzvorrichtung,
- Fig. 2
- in einer ersten Ausführungsform eine erfindungsgemäße Vorrichtung zum Sperren mindestens einer Verdrehrichtung der Schutzvorrichtung, wobei die Vorrichtung einen Anschlag und einen Gegenanschlag aufweist,
- Fig. 3
- eine Sperrvorrichtung in einer zweiten Ausführungsform, bei welcher eine Befestigungsschraube als Gegenanschlag dient,
- Fig. 4
- eine Sperrvorrichtung in einer dritten Ausführungsform, bei welcher der gehäusefeste Gegenanschlag zusätzlich als Niederhalter für die Schutzvorrichtung dient,
- Fig. 5
- eine Sperrvorrichtung in einer vierten Ausführungsform, bei welcher der Gegenanschlag an einem als Plattenelement ausgebildetes Gehäuseelement vorgesehen ist,
- Fig. 6
- eine Sperrvorrichtung in einer fünften Ausführungsform, bei welcher der Gegenanschlag als Hakenausklinkung an einem als Blechformteil ausgebildeten Gehäuseelement vorgesehen ist,
- Fig. 7
- eine Sperrvorrichtung in einer sechsten Ausführungsform, bei welcher ein Gehäuseelement verstellbar an einem Gehäuse der Handwerkzeugmaschine angebracht ist,
- Fig. 8
- eine Sperrvorrichtung in einer siebten Ausführungsform, bei welcher ein einen Gegenanschlag aufweisendes Einlegeteil Vorsprünge aufweist, die in Aussparungen im Getriebeflansch einlegbar sind,
- Fig. 9
- eine Sperrvorrichtung in einer achten Ausführungsform, bei welcher ein einen Gegenanschlag aufweisendes Einlegeteil unter dem Getriebeflansch angeordnet ist,
- Fig. 10
- eine Sperrvorrichtung in einer neunten Ausführungsform, bei welcher eine Dämpfungseinrichtung vorgesehen ist,
- Fig. 11
- eine Alternative der Dämpfungseinrichtung gemäß
Figur 9 , - Fig. 12
- eine weitere Alternative der Dämpfungseinrichtung gemäß
Figur 9 , - Fig. 13
- eine Sperrvorrichtung in einer zehnten Ausführungsform, bei welcher ein am Spannband angeordneter Anschlag, als Dämpfungseinrichtung ausgebildet ist,
- Fig. 14
- eine Sperrvorrichtung in einer elften Ausführungsform, bei welcher ein einen Gegenanschlag aufweisendes Ringelement auf den Flanschhals aufschiebbar ist,
- Fig. 15
- eine Sperrvorrichtung in einer zwölften Ausführungsform, bei welcher ein Gegenanschlag an einer Stirnseite des Flanschhalses vorgesehen ist,
- Fig. 16
- eine Alternative des Gegenanschlags gemäß
Figur 14 , - Fig. 17
- eine weitere Alternative des Gegenanschlags gemäß
Figur 14 , - Fig. 18
- eine Sperrvorrichtung in einer dreizehnten Ausführungsform, bei der Gegenanschlag in einer Richtung einer Längsachse gefedert, an der Stirnseite des Flanschhalses gelagert ist,
- Fig. 19
- eine Sperrvorrichtung in einer vierzehnten Ausführungsform, bei welcher eine als Anschlag ausgebildete Nase in eine als Gegenanschlag ausgebildete Nut eingreift, wobei die Nut in Umfangsrichtung Begrenzungen aufweist,
- Fig. 20
- eine Variante einer Begrenzung gemäß
Figur 18 , - Fig. 21
- eine weitere Variante einer Begrenzung gemäß
Figur 18 , - Fig. 22
- eine Sperrvorrichtung in einer fünfzehnten Ausführungsform, bei welcher eine Nut in einem Randbereich des Flanschhalses verläuft,
- Fig. 23
- eine Sperrvorrichtung in einer sechzehnten Ausführungsform, bei welcher die Nut durch den Flanschhals und ein auf den Flanschhals aufgesetztes Scheibenelement gebildet ist,
- Fig. 24
- eine Sperrvorrichtung in einer siebzehnten Ausführungsform, bei welcher die Nut im Getriebeflansch verläuft,
- Fig. 25
- eine Sperrvorrichtung in einer achtzehnten Ausführungsform, bei welcher die Nut durch den Flanschhals und ein auf den Flanschhals aufgeschobenes, am Getriebeflansch befestigtes Plattenelement gebildet ist,
- Fig. 26
- eine Sperrvorrichtung in einer neunzehnten Ausführungsform, bei welcher der Anschlag am Getriebegehäuse angeordnet ist,
- Fig. 27a, 27b
- eine Sperrvorrichtung in einer zwanzigsten Ausführungsform, bei welcher ein Gegenanschlag an dem Getriebeflansch angeordnet ist, in einer ersten perspektivischen Darstellung (
Fig. 27a ) und einer zweiten perspektivischen Darstellung (Fig. 27b ), - Fig. 28a, 28b
- der Gegenanschlag aus den
Figuren 27a, 27b in einer ersten perspektivischen Darstellung (Fig. 28a ) und einer zweiten perspektivischen Darstellung (Fig. 28b ), - Fig. 29a, 29b
- ein Teilbereich des Getriebeflanschs aus den
Figuren 27a, 27b in einer ersten perspektivischen Darstellung (Fig. 29a ) und einer zweiten perspektivischen Darstellung (Fig. 29b ) und - Fig. 30a, 30b
- die Sperrvorrichtung aus den
Figuren 27a, 27b mit einer montierten Schutzvorrichtung.
- Fig. 1
- in an exploded view, a detail of hand-held power tool shown with a rotatable in the circumferential direction protective device,
- Fig. 2
- in a first embodiment, a device according to the invention for blocking at least one direction of rotation of the protective device, wherein the device has a stop and a counter-stop,
- Fig. 3
- a locking device in a second embodiment, in which a fastening screw serves as a counter-stop,
- Fig. 4
- a locking device in a third embodiment, in which the housing-fixed counter-stop additionally serves as hold-down for the protective device,
- Fig. 5
- a locking device in a fourth embodiment, in which the counter-stop is provided on a housing element designed as a plate element,
- Fig. 6
- a locking device in a fifth embodiment, in which the counter-stop is provided as a hook notch on a housing element designed as a sheet-metal part,
- Fig. 7
- a locking device in a sixth embodiment, in which a housing element is adjustably mounted on a housing of the power tool,
- Fig. 8
- a locking device in a seventh embodiment, in which a counterpart having Einlageteil has projections which can be inserted into recesses in the transmission flange,
- Fig. 9
- a locking device in an eighth embodiment, in which a counter-abutment insert is disposed below the transmission flange,
- Fig. 10
- a locking device in a ninth embodiment, in which a damping device is provided,
- Fig. 11
- an alternative of the damping device according to
FIG. 9 . - Fig. 12
- a further alternative of the damping device according to
FIG. 9 . - Fig. 13
- a locking device in a tenth embodiment, in which a stop arranged on the strap, is designed as a damping device,
- Fig. 14
- a locking device in an eleventh embodiment, in which a counter-abutment ring element is pushed onto the flange neck,
- Fig. 15
- a locking device in a twelfth embodiment, in which a counter-stop is provided on an end face of the flange neck,
- Fig. 16
- an alternative to the counter-attack according to
FIG. 14 . - Fig. 17
- another alternative of the counter-attack according to
FIG. 14 . - Fig. 18
- a locking device in a thirteenth embodiment, wherein the counter-stop is sprung in a direction of a longitudinal axis, is mounted on the end face of the flange neck,
- Fig. 19
- a locking device in a fourteenth embodiment, in which a nose formed as a stop engages in a groove formed as a counter-stop, wherein the groove has boundaries in the circumferential direction,
- Fig. 20
- a variant of a limitation according to
FIG. 18 . - Fig. 21
- a further variant of a limitation according to
FIG. 18 . - Fig. 22
- a locking device in a fifteenth embodiment, in which a groove extends in an edge region of the flange neck,
- Fig. 23
- a locking device in a sixteenth embodiment, in which the groove is formed by the flange neck and a disc member mounted on the flange neck,
- Fig. 24
- a locking device in a seventeenth embodiment, in which the groove extends in the gearbox flange,
- Fig. 25
- a locking device in an eighteenth embodiment, in which the groove is formed by the flange neck and a pushed onto the Flanschhals, attached to the transmission flange plate member
- Fig. 26
- a locking device in a nineteenth embodiment, wherein the stop is arranged on the transmission housing,
- Fig. 27a, 27b
- a locking device in a twentieth embodiment, in which a counter-stop on the gear flange is arranged, in a first perspective view (
Fig. 27a ) and a second perspective view (Fig. 27b ) - Fig. 28a, 28b
- the counter-attack from the
Figures 27a, 27b in a first perspective view (Fig. 28a ) and a second perspective view (Fig. 28b ) - Fig. 29a, 29b
- a portion of the gearbox flange from the
Figures 27a, 27b in a first perspective view (Fig. 29a ) and a second perspective view (Fig. 29b ) and - Fig. 30a, 30b
- the locking device from the
Figures 27a, 27b with a mounted protection device.
Die Abtriebswelle 52 ist in einem hier nicht sichtbaren Lager drehbar gelagert, das in den vorliegenden Ausführungsbeispielen von einem vom Getriebegehäuse 32 ausgebildeten Getriebeflansch 30 aufgenommen wird. Das Getriebegehäuse 32 bildet einen an den Getriebeflansch 30 anschließenden, frei vorstehenden, zylindrischen Flanschhals 12, der die Abtriebswelle 52 umgreift.
Der Flanschhals 12 nimmt auf seinem Außenumfang eine Schutzvorrichtung 16, in Form einer Schutzhaube auf, welche in Umfangsrichtung 18, 20 auf dem Flanschhals 12 verdrehbar ist. Die Schutzvorrichtung 16 umfasst einen Grundkörper 58 und einen mit dem Grundkörper 58 verbundenen Aufnahmebund 28, welcher eine zentrale Öffnung zum freien Durchtritt der Abtriebswelle 52 ausbildet. Der Aufnahmebund 28 ist als zylindrischer Körper, welcher parallel zum Flanschhals 12 verläuft, ausgeführt. Der Grundkörper 58 ist zu einem Schutz eines Bedieners der Handwerkzeugmaschine vor Funken und/oder Materialpartikel, die im Betrieb der Handwerkzeugmaschine entstehen, vorgesehen. Hierzu ist der Grundkörper 58 von einem tellerförmigen Element 60 gebildet, das eine halbkreisförmige Ausbildung aufweist, wobei das tellerförmige Element 60 einen Winkelbereich von ca. 180° des Werkzeugs 54 abdeckt. Hierdurch wird für einen Bediener der Handwerkzeugmaschine 10 mit der Schutzvorrichtung 16 eine besonders vorteilhafte Abschirmung von Funken, Materialpartikel und/oder sich mit hoher Energie radial nach außen bewegende Bruchstücke eines geborstenen Werkzeugs erreicht, indem Funken und/oder etwaige Materialpartikel nach vorne, weg vom Bediener geleitet werden. An das tellerförmige Element 60 ist ein Schutzrand 62 angeordnet, der zunächst senkrecht zum tellerförmigen Element 60 und anschließend parallel zum tellerförmigen Element 60 ausgerichtet ist.The
The
Die Schutzvorrichtung 16 wird bei den folgenden Ausführungsbeispielen über eine Klemmung des als Spannband ausgeführten Aufnahmebundes 28 durch Reibschluss auf dem Flanschhals 12, ähnlich einer Rohrschelle, befestigt, wobei auch jede andere einem Fachmann als sinnvoll erscheinende Befestigung der Schutzvorrichtung 16 am Flanschhals 12 denkbar ist. Beispielsweise kann das Spannband auch als separates Teil vorliegen, welches um den Aufnahmebund der Schutzvorrichtung 16 herumgelegt wird. Die Klemmung des Spannbandes 28 erfolgt üblicherweise entweder über eine Spannschraube 64 oder über einen Spannhebel. Hierzu umfasst die Handwerkzeugmaschine 10 das Spannband 28 und eine Spanneinheit 66. Das Spannband 28 ist ringförmig ausgebildet und vorzugsweise an den Grundkörper 58 angeschweißt. Grundsätzlich sind auch weitere, dem Fachmann als sinnvoll erscheinende Verbindungen zwischen dem Spannband 28 und dem Grundkörper 58 denkbar. Das ringförmige Spannband 28 wird mit Hilfe der Spanneinheit 66 um den Flanschhals 12 gespannt, indem ein Umfang des ringförmigen Spannbands 28 über die Spanneinheit 66 verkürzt oder erweitert wird. Bei der im Ausführungsbeispiel dargestellten Spanneinheit 66 werden zwei Enden 68 des Spannbandes 28 über die Spannschraube 64 gegeneinander verspannt.The
Im Notfallbetrieb beispielsweise bei einem Bersten des Werkzeugs 54, einem sogenannten burst-wheel-Fall, werden die entstehenden Bruchstücke mit hoher kinetischer Energie auf den ringförmigen Innenbereich der Schutzvorrichtung 16 geschleudert. Die Wucht des Aufpralls sorgt für eine in tangentialer Richtung auftreffenden Kraft, die das Bestreben hat, die Schutzvorrichtung 16 trotz der Klemmung am Flanschhals 12 aus ihrer Lage in radialer Richtung bzw. in Umfangsrichtung 18, 20 zu verdrehen. Durch das Verdrehen der Schutzvorrichtung 16 gegenüber dem Flanschhals 12 bzw. dem Gehäuse 14 um einen durch Versuche vorher bestimmbaren Winkelbetrag wird ein Teil der kinetischen Energie der Bruchstücke absorbiert. Die Bruchstücke des geborstenen scheibenförmigen Werkzeugs 54 werden abgebremst und treten mit verminderter Geschwindigkeit aus einem offenen Bereich 70 der Schutzvorrichtung 16 hinaus.In emergency operation, for example, when a bursting of the
Um das Verdrehen der Schutzvorrichtung 16 im burst-wheel-Fall zu unterbinden bzw. energievermindernd an einer definierten Stelle zu stoppen, weist die Handwerkzeugmaschine 10 eine Vorrichtung 22 zum Sperren mindestens einer Verdrehrichtung 18, 20 der Schutzvorrichtung 22 auf. Gemäß
Vorteilhafterweise sind der mindestens eine Anschlag 24 und der mindestens eine Gegenanschlag 26 gemäß
Vorzugsweise sind die Anschläge 24, 26 derart ausgestaltet, dass diese ein Verdrehen der Schutzvorrichtung 16 in eine Verdrehrichtung 18 oder 20 verhindern und ein Verdrehen der Schutzvorrichtung 16 in die entgegengesetzte Verdrehrichtung 20 oder 18 ermöglichen.Preferably, the stops 24, 26 are designed such that they prevent rotation of the
In den vorliegenden Ausführungsbeispielen ist der Anschlag 24 am Spannband 28 der Schutzvorrichtung 16 vorgesehen, wobei auch jede andere, einem Fachmann als sinnvoll erscheinende schutzvorrichtungsfeste Anordnung des Anschlags 24 möglich ist. Die Ausführungsbeispiele zeigen dabei unterschiedliche Varianten der Anordnung des Anschlags 24 am Spannband 28, wie beispielsweise eine Anordnung an einer Außenseite 72 des Spannbandes 28, eine Anordnung an einer Innenseite 42 des Spannbandes 28, eine Anordnung an einer Stirnseite 44 des Spannbandes 28 oder eine weitere Variante, bei welcher der Anschlag 24 in die Schutzvorrichtung 16 integriert bzw. einstückig mit der Schutzvorrichtung 16 ausgeführt ist, indem die beiden Enden 68 des Spannbandes 28 als Anschlag 24 dienen. Es sind noch weitere einem Fachmann als sinnvoll erscheinende Anordnungen des Anschlags 24 am Spannband 28 denkbar. Der Anschlag 24 kann sowohl als separates, an dem Spannband 28 befestigtes Bauteil als auch einstückig mit der Schutzvorrichtung 16 ausgeführt sein.In the present embodiments, the stop 24 is provided on the
In den vorliegenden Ausführungsbeispielen gemäß
Das separate, gehäusefeste Gehäuseelement 34 ist in den Ausführungsbeispielen als ein auf oder unter dem Getriebeflansch 30 vorgesehenes Plattenelement 48 oder als ein auf dem Flanschhals 12 aufnehmbares Ringelement ausgebildet.The separate, housing-fixed housing element 34 is formed in the embodiments as a provided on or below the
Vorteilhafterweise kann der Anschlag 24 verstellbar an der Schutzvorrichtung 16 und/oder der Gegenanschlag 26 verstellbar am Gehäuse 14 und/oder verstellbar am Gehäuseelement 34 angeordnet sein. Des Weiteren kann das Gehäuseelement 34 verstellbar mit dem Gehäuse 14 verbunden sein. Die Verbindung des Gehäuseelements 34 mit dem Gehäuse 14 kann über Vorsprünge 36 des Gehäuseelements 34 und/oder des Gehäuses 14, welche in Aussparungen 38 des Gehäuses 14 und/oder des Gehäuseelements 34 einlegbar sind, erfolgen.Advantageously, the stop 24 can be adjustably arranged on the
Die zwanzig Ausführungsbeispiele der erfindungsgemäßen Sperrvorrichtung 22, welche in den
Die Vorrichtung 22 zum Sperren kann vorzugsweise mindestens eine Dämpfungseinrichtung 40 aufweisen, wobei der Gegenanschlag 26 und/oder der Anschlag 24 die Dämpfungseinrichtung 40 aufweist und/oder als Dämpfungseinrichtung 40 ausgebildet ist.The device 22 for blocking may preferably have at least one damping device 40, wherein the counter-stop 26 and / or the stop 24 has the damping device 40 and / or is designed as a damping device 40.
Anschläge können derart gestaltet sein, dass diese ein Verdrehen der Schutzvorrichtung 16 in eine Verdrehrichtung 18 oder 20 sperren, während in entgegen gesetzter Richtung 20 oder 18 ein Durchrasten der Schutzvorrichtung 16 erlaubt ist.
In den folgenden Ausführungsbeispielen ist der Anschlag 24 als mindestens eine Nase ausgebildet, welche in eine als Gegenanschlag 26 ausgebildete Nut eingreift, wobei die Nase 24 an einer Innenseite 42 und/oder an einer Stirnseite 44 eines Spannbandes 28 der Schutzvorrichtung 16 vorgesehen ist und die Nut 26 durch eine an einem Außenumfang des Flanschhalses 12 und/oder im Getriebeflansch 30 verlaufende, in Umfangsrichtung 18, 20 begrenzte Vertiefung gebildet ist. Die Begrenzung 48 der Nut 26 ist durch ein in die Nut 26 eingeschobenes Element, eine an dem Scheibenelement 34 vorgesehene Lasche oder eine an dem Plattenelement 34 vorgesehene Ausstülpung gebildet.In the following embodiments, the stop 24 is formed as at least one nose which engages in a formed as a counter-stop groove 26, wherein the nose 24 is provided on an inner side 42 and / or on an end face 44 of a
Die
Die Aussparung 106t ist im Bereich 128t einer Befestigungsausnehmung 130t zur Befestigung des Getriebeflansches 30t an einem Getriebegehäuse 32 der Handwerkzeugmaschine angeordnet, so dass bei einer Befestigung des Gegenanschlags 26t mit dem Getriebeflansch 30t dieser zugleich mit dem Getriebegehäuse 32 befestigt wird. Hierzu weist auch der Gegenanschlag 26t eine Ausnehmung 132t auf (
Der Gegenanschlag 26t weist einen Grundkörper 144t, der eine verjüngte Form der Aussparung 106t aufweist und in einem montierten Zustand in dieser angeordnet ist, und ein Anschlagelement 146t auf (vgl.
Zudem weist das Anschlagelement 146t des Gegenanschlags 26t eine Einbuchtung 116t auf, die in einem Auftreffbereich 118t bei einem Auftreffen des Anschlags 24t auf den Gegenanschlag 26t angeordnet ist (
Claims (29)
- Portable power tool, in particular an angle grinder (10), having a housing (14) that has a flange neck (12), having a protective apparatus (16) which is receivable on the flange neck (12) and is rotatable in the circumferential direction (18, 20), and having at least one apparatus (22) for blocking at least one direction of rotation (18, 20) of the protective apparatus (22), wherein the apparatus (22) for blocking comprises at least one stop (24) and at least one counter-stop (26) that interacts with the stop (24), characterized in that the stops (24, 26) are configured such that, in emergency operation, the portable power tool allows rotation of the protective apparatus (16) in at least one direction of rotation (18, 20) only as far as a predetermined rotary position, such that the protective apparatus (16) absorbs energy when struck by tool fragments, with the protective apparatus (16) first of all executing a rotary movement with respect to the housing (14) of the portable power tool.
- Portable power tool according to Claim 1, characterized in that the stops (24, 26) are configured such that they prevent rotation of the protective apparatus (16) in one direction of rotation (18, 20) and allow rotation of the protective apparatus (16) in the opposite direction of rotation (20, 18).
- Portable power tool according to Claim 1 or 2, characterized in that the stop (24) is arranged on the portable power tool (10) in a manner fixed to the protective apparatus and the counter-stop (26) is arranged on the portable power tool (10) in a manner fixed to the housing.
- Portable power tool according to one of the preceding claims, characterized in that the stop (24) is provided on a clamping band (28) of the protective apparatus (16).
- Portable power tool according to Claim 4, characterized in that the stop (24) is formed at least partially by a closure element (162t) of the protective apparatus (16).
- Portable power tool according to one of the preceding claims, characterized in that the counter-stop (26) is provided on a transmission flange (30), on the flange neck (12), on a transmission housing (32) and/or on a housing element (34).
- Portable power tool according to Claim 6, characterized in that the counter-stop (26) is formed integrally with the transmission flange (30), the flange neck (12), the transmission housing (32) and/or the housing element (34).
- Portable power tool according to Claim 6, characterized in that the housing element (34) is in the form of an element (34d, 34e, 34f, 34g, 34h, 34r) provided on or under the transmission flange (30) or in the form of an element (34k, 34p) that is receivable on the flange neck (12).
- Portable power tool according to one of the preceding claims, characterized in that the stop (24) is arranged in an adjustable manner on the protective apparatus (16) and/or the counter-stop (26) is arranged in an adjustable manner on the housing (14) and/or on the housing element (34).
- Portable power tool according to one of the preceding claims, characterized in that the housing element (34) is connected to the housing (14) in an adjustable manner.
- Portable power tool according to Claim 10, characterized in that the connection takes place via projections (36) of the housing element (34) and/or of the housing (14), said projections being insertable into cutouts (38) in the housing (14) and/or in the housing element (34).
- Portable power tool according to one of the preceding claims, characterized in that the apparatus (22) for blocking has at least one damping device (40).
- Portable power tool according to Claim 12, characterized in that the stop (24) and/or the counter-stop (26) has the damping device (40) and/or is in the form of the damping device (40).
- Portable power tool according to one of the preceding claims, characterized in that the stop is in the form of at least one lug (24) which engages into a groove (26) in the form of a counter-stop.
- Portable power tool according to Claim 14, characterized in that the lug (24) is provided on an inner side (42) and/or on an end side (44) of the clamping band (28) of the protective apparatus (16).
- Portable power tool according to Claim 14 or 15, characterized in that the groove is formed by a depression (26) that extends on an outer circumference of the flange neck (12) and/or in the transmission flange (30) and is delimited in the circumferential direction.
- Portable power tool according to one of Claims 14 to 16, characterized in that the groove (26) is formed by the flange neck (12) and a disc element (34p) placed on the flange neck (12).
- Portable power tool according to one of Claims 14 to 17, characterized in that the groove (26) is formed by the transmission flange (30) and a plate element (34r) placed on the transmission flange (30).
- Portable power tool according to one of Claims 14 to 18, characterized in that the limit (48) of the groove (26) is formed by an element (48n) introduced into the groove (26), a tab (48p) provided on the disc element (34p) or a protrusion (48r) provided on the plate element (34r).
- Portable power tool according to one of the preceding claims, characterized in that the counter-stop (26) fixed to the housing additionally serves as a holding-down means for the protective apparatus (16).
- Portable power tool according to one of the preceding claims, characterized in that the apparatus (22t) for blocking has at least one receiving unit (104t) which is arranged on a transmission flange (30t) and is provided to receive the counter-stop (26t).
- Portable power tool according to Claim 21, characterized in that the receiving unit (104t) has at least one cutout (160t) on the transmission flange (30t), said cutout (160t) being provided to receive the counter-stop (26t).
- Portable power tool according to Claim 21, characterized in that the receiving unit (104t) has at least one supporting element (108t) which supports the counter-stop (26t) in at least one direction of rotation (18t, 20t).
- Portable power tool according to Claim 23, characterized in that the supporting element (108t) is formed by a rib (114t) that extends in the radial direction (110t).
- Portable power tool according to Claim 21, characterized in that the receiving unit (104t) has at least one supporting element (112t) which supports the counter-stop (26t) in at least one radial direction (110t).
- Portable power tool according to Claim 23 and/or 25, characterized in that the supporting element (112t) for supporting the counter-stop (26t) in the radial direction (110t) and/or the supporting element (108t) for supporting the counter-stop (26t) in at least one direction of rotation (18t, 20t) is formed integrally with a transmission flange (30t).
- Portable power tool according to one of the preceding claims, characterized in that the counter-stop (26t) is arranged on a transmission flange (30t) in a screwable manner.
- Portable power tool according to one of the preceding claims, characterized in that the counter-stop (26t) is formed from a material which is formed differently from a material of a transmission flange (30t).
- Portable power tool according to one of the preceding claims, characterized in that the counter-stop (26t) has an indentation (116t) which is arranged in an impact region (118t) for the stop (24t).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007057032A DE102007057032A1 (en) | 2007-11-27 | 2007-11-27 | Hand tool |
PCT/EP2008/062994 WO2009068341A1 (en) | 2007-11-27 | 2008-09-29 | Hand-held power tool |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2214866A1 EP2214866A1 (en) | 2010-08-11 |
EP2214866B1 true EP2214866B1 (en) | 2013-06-19 |
Family
ID=40345010
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08804856.6A Active EP2214866B1 (en) | 2007-11-27 | 2008-09-29 | Hand-held power tool |
Country Status (6)
Country | Link |
---|---|
US (1) | US8500521B2 (en) |
EP (1) | EP2214866B1 (en) |
CN (1) | CN101878093B (en) |
DE (1) | DE102007057032A1 (en) |
RU (1) | RU2492988C2 (en) |
WO (1) | WO2009068341A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140057538A1 (en) * | 2012-08-21 | 2014-02-27 | Robert Bosch Gmbh | Protective hood device |
US11806857B2 (en) | 2020-08-28 | 2023-11-07 | Black & Decker, Inc. | Airflow intake configuration in power tool |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8690637B2 (en) * | 2008-12-08 | 2014-04-08 | Toyota Motor Engineering & Manufacturing North America, Inc. | Flex-arm devices and methods |
DE102009028404A1 (en) | 2009-08-10 | 2011-02-17 | Robert Bosch Gmbh | Machine tool with a protective hood |
JP5579575B2 (en) | 2010-11-02 | 2014-08-27 | 株式会社マキタ | Disc grinder |
US9475172B2 (en) | 2014-07-15 | 2016-10-25 | Milwaukee Electric Tool Corporation | Adjustable guard for power tool |
USD744800S1 (en) | 2014-07-16 | 2015-12-08 | Milwaukee Electric Tool Corporation | Power tool blade guard |
DE202014009916U1 (en) | 2014-12-15 | 2015-01-16 | Robert Bosch Gmbh | Hand tool |
JP6632840B2 (en) * | 2015-09-10 | 2020-01-22 | 株式会社マキタ | Grinder |
JP6634248B2 (en) | 2015-09-10 | 2020-01-22 | 株式会社マキタ | Grinders and covers |
JP6667236B2 (en) | 2015-09-10 | 2020-03-18 | 株式会社マキタ | Grinders, covers and cover sets |
JP6307787B1 (en) * | 2017-05-26 | 2018-04-11 | 株式会社ナカヤ | Guard mounting mechanism |
JP6982991B2 (en) * | 2017-06-20 | 2021-12-17 | 株式会社マキタ | Grinder |
DE102017213743A1 (en) * | 2017-08-08 | 2019-02-14 | Robert Bosch Gmbh | Protective device for a hand tool machine |
CN112223119A (en) * | 2020-10-20 | 2021-01-15 | 上海波邦电控科技发展有限公司 | Dust cover of angle grinder |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
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IT1040243B (en) | 1975-07-30 | 1979-12-20 | Star Utensili Elett | PROTECTION CASE FOR PORTABLE CORNER TOOLS |
SU716792A1 (en) * | 1978-04-07 | 1980-02-25 | Всесоюзный Научно-Исследовательский И Проектно-Конструкторский Институт Механизированного И Ручного Строительно-Монтажного Инструмента, Вибраторов И Строительно-Отделочных Машин | Vibration-insulated hand-operated tool |
CS222119B1 (en) * | 1981-03-10 | 1983-04-29 | Borivoj Prazsky | Protective cover of the grinding disc |
DE3636601A1 (en) * | 1986-10-28 | 1988-05-05 | Bosch Gmbh Robert | PROTECTIVE COVER FOR GRINDING MACHINES, ESPECIALLY ANGLE GRINDERS, AND THE FASTENING MOUNTING THAT MATCH THEM |
DE3744219A1 (en) * | 1987-12-24 | 1989-07-06 | Fein C & E | HAND GRINDING MACHINE WITH ADJUSTABLE PROTECTIVE COVER |
DE3913898A1 (en) * | 1989-04-27 | 1990-10-31 | Licentia Gmbh | Adjustable guard for portable power tools - has indent mechanism for angular adjustment and finger pressure actuated fastening to spindle nose |
DE19834839C2 (en) * | 1998-08-01 | 2002-04-11 | C & E Fein Gmbh & Co Kg | Grinder with a removable protective hood |
US6464573B1 (en) * | 2000-06-30 | 2002-10-15 | Porter-Cable Corporation | Guard attachment system with knurled clamp ring |
DE10131266A1 (en) | 2001-06-29 | 2003-01-09 | Bosch Gmbh Robert | hand grinder |
US6893334B1 (en) * | 2002-01-24 | 2005-05-17 | J. David Stivers | Rotating guard for angle grinder |
DE10316182A1 (en) * | 2003-04-09 | 2004-10-28 | Robert Bosch Gmbh | Hand grinder with protective hood |
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 |
DE10348395A1 (en) * | 2003-10-17 | 2005-05-19 | Robert Bosch Gmbh | Protective cover for a power tool, power tool and system with protective hood and power tool |
-
2007
- 2007-11-27 DE DE102007057032A patent/DE102007057032A1/en not_active Withdrawn
-
2008
- 2008-09-29 CN CN200880117986.3A patent/CN101878093B/en active Active
- 2008-09-29 EP EP08804856.6A patent/EP2214866B1/en active Active
- 2008-09-29 US US12/745,060 patent/US8500521B2/en active Active
- 2008-09-29 WO PCT/EP2008/062994 patent/WO2009068341A1/en active Application Filing
- 2008-09-29 RU RU2010125770/02A patent/RU2492988C2/en not_active IP Right Cessation
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140057538A1 (en) * | 2012-08-21 | 2014-02-27 | Robert Bosch Gmbh | Protective hood device |
US9089950B2 (en) * | 2012-08-21 | 2015-07-28 | Robert Bosch Gmbh | Protective hood device |
US11806857B2 (en) | 2020-08-28 | 2023-11-07 | Black & Decker, Inc. | Airflow intake configuration in power tool |
Also Published As
Publication number | Publication date |
---|---|
US8500521B2 (en) | 2013-08-06 |
DE102007057032A1 (en) | 2009-05-28 |
RU2010125770A (en) | 2012-01-10 |
EP2214866A1 (en) | 2010-08-11 |
RU2492988C2 (en) | 2013-09-20 |
CN101878093B (en) | 2014-01-15 |
US20100304648A1 (en) | 2010-12-02 |
WO2009068341A1 (en) | 2009-06-04 |
CN101878093A (en) | 2010-11-03 |
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