EP2214866B1 - Machine-outil à main - Google Patents

Machine-outil à main Download PDF

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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.)
Active
Application number
EP08804856.6A
Other languages
German (de)
English (en)
Other versions
EP2214866A1 (fr
Inventor
Cornelius Boeck
Joachim Schadow
Sinisa Andrasic
Josef Enfellner
Michael Habele
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2214866A1 publication Critical patent/EP2214866A1/fr
Application granted granted Critical
Publication of EP2214866B1 publication Critical patent/EP2214866B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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)
  • Harvester Elements (AREA)
  • Gear Transmission (AREA)

Claims (29)

  1. Machine-outil à main, en particulier meuleuse d'angle (10), comprenant un boîtier (14) présentant un collet de bride (12), un dispositif de protection (16) pouvant être reçu sur le collet de bride (12), lequel dispositif de protection pouvant tourner dans la direction périphérique (18, 20), et au moins dispositif (22) pour bloquer au moins un sens de rotation (18, 20) du dispositif de protection (22), le dispositif (22) de blocage comprenant au moins une butée (24) et au moins une contre-butée (26) coopérant avec la butée (24), caractérisée en ce que les butées (24, 26) sont configurées de telle sorte qu'en mode de fonctionnement de secours de la machine-outil à main, une rotation du dispositif de protection (16) dans au moins un sens de rotation (18, 20) ne soit possible que jusque dans une position de rotation prédéterminée, de telle sorte que le dispositif de protection (16), en cas d'impact de fragments d'outils, absorbe de l'énergie, le dispositif de protection (16) effectuant pour cela tout d'abord un mouvement de rotation par rapport au boîtier (14) de la machine-outil à main.
  2. Machine-outil à main selon la revendication 1, caractérisée en ce que les butées (24, 26) sont configurées de telle sorte qu'elles empêchent une rotation du dispositif de protection (16) dans un sens de rotation (18, 20) et qu'elles permettent une rotation du dispositif de protection (16) dans le sens de rotation opposé (20, 18).
  3. Machine-outil à main selon la revendication 1 ou 2, caractérisée en ce que la butée (24) est disposée sur la machine-outil à main (10) de manière fixée au dispositif de protection et la contre-butée (26) est disposée de manière fixée au boîtier sur la machine-outil à main (10).
  4. Machine-outil à main selon l'une quelconque des revendications précédentes, caractérisée en ce que la butée (24) est prévue au niveau d'une bande de serrage (28) du dispositif de protection (16).
  5. Machine-outil à main selon la revendication 4, caractérisée en ce que la butée (24) est formée au moins en partie par un élément de fermeture (162t) du dispositif de protection (16).
  6. Machine-outil à main selon l'une quelconque des revendications précédentes, caractérisée en ce que la contre-butée (26) est prévue sur une bride de mécanisme (30), sur le collet de bride (12), sur un boîtier de mécanisme (32) et/ou sur un élément de boîtier (34).
  7. Machine-outil à main selon la revendication 6, caractérisée en ce que la contre-butée (26) est réalisée d'une seule pièce avec la bride de mécanisme (30), le collet de bride (12), le boîtier de mécanisme (32) et/ou l'élément de boîtier (34).
  8. Machine-outil à main selon la revendication 6, caractérisée en ce que l'élément de boîtier (34) est réalisé sous forme d'élément (34d, 34e, 34f, 34g, 34h, 34r) prévu sur ou sous la bride de mécanisme (30) ou sous forme d'élément (34k, 34p) pouvant être reçu sur le collet de bride (12).
  9. Machine-outil à main selon l'une quelconque des revendications précédentes, caractérisée en ce que la butée (24) est disposée de manière réglable sur le dispositif de protection (16) et/ou en ce que la contre-butée (26) est disposée de manière réglable sur le boîtier (14) et/ou sur l'élément de boîtier (34).
  10. Machine-outil à main selon l'une quelconque des revendications précédentes, caractérisée en ce que l'élément de boîtier (34) est connecté de manière réglable au boîtier (14).
  11. Machine-outil à main selon la revendication 10, caractérisée en ce que la connexion s'effectue par le biais de saillies (36) de l'élément de boîtier (34) et/ou du boîtier (14), qui peuvent être introduites dans des évidements (38) du boîtier (14) et/ou de l'élément de boîtier (34).
  12. Machine-outil à main selon l'une quelconque des revendications précédentes, caractérisée en ce que le dispositif (22) de blocage présente au moins un dispositif d'amortissement (40).
  13. Machine-outil à main selon la revendication 12, caractérisée en ce que la butée (24) et/ou la contre-butée (26) présentent le dispositif d'amortissement (40) et/ou sont réalisées sous forme de dispositif d'amortissement (40).
  14. Machine-outil à main selon l'une quelconque des revendications précédentes, caractérisée en ce que la butée est réalisée sous forme d'au moins un ergot (24) qui vient en prise dans une rainure (26) réalisée sous forme de contre-butée.
  15. Machine-outil à main selon la revendication 14, caractérisée en ce que l'ergot (24) est prévu sur un côté intérieur (42) et/ou sur un côté frontal (44) de la bande de serrage (28) du dispositif de protection (16).
  16. Machine-outil à main selon la revendication 14 ou 15, caractérisée en ce que la rainure est formée par un renfoncement (26) limité dans la direction périphérique, s'étendant sur une périphérie extérieure du collet de bride (12) et/ou dans la bride de mécanisme (30).
  17. Machine-outil à main selon l'une quelconque des revendications 14 à 16, caractérisée en ce que la rainure (26) est formée par le collet de bride (12) et par un élément de rondelle (34p) posé sur le collet de bride (12).
  18. Machine-outil à main selon l'une quelconque des revendications 14 à 17, caractérisée en ce que la rainure (26) est formée par la bride de mécanisme (30) et par un élément formant plaque (34r) posé sur la bride de mécanisme (30).
  19. Machine-outil à main selon l'une quelconque des revendications 14 à 18, caractérisée en ce que la limitation (48) de la rainure (26) est formée par un élément (48n) enfoncé dans la rainure (26), par une patte (48p) prévue sur l'élément de rondelle (34p) ou par une protubérance (48r) prévue sur l'élément formant plaque (34r).
  20. Machine-outil à main selon l'une quelconque des revendications précédentes, caractérisée en ce que la contre-butée fixée au boîtier (26) sert en outre de serre-flan pour le dispositif de protection (16).
  21. Machine-outil à main selon l'une quelconque des revendications précédentes, caractérisée en ce que le dispositif (22t) de blocage présente au moins une unité de réception (104t) qui est disposée sur une bride de mécanisme (30t) et qui est prévue pour recevoir la contre-butée (26t).
  22. Machine-outil à main selon la revendication 21, caractérisée en ce que l'unité de réception (104t) présente au moins un évidement (106t) sur la bride de mécanisme (30t) qui est prévu pour recevoir la contre-butée (26t).
  23. Machine-outil à main selon la revendication 21, caractérisée en ce que l'unité de réception (104t) présente au moins un élément d'appui (108t) qui supporte la contre-butée (26t) dans au moins un sens de rotation (18t, 20t).
  24. Machine-outil à main selon la revendication 23, caractérisée en ce que l'élément d'appui (108t) est formé par une nervure (114t) s'étendant dans la direction radiale (110t).
  25. Machine-outil à main selon la revendication 21, caractérisée en ce que l'unité de réception (104t) présente au moins un élément d'appui (112t) qui supporte la contre-butée (26t) dans au moins une direction radiale (110t).
  26. Machine-outil à main selon la revendication 23 et/ou 25, caractérisée en ce que l'élément d'appui (112t) est réalisé pour supporter la contre-butée (26t) dans la direction radiale (110t) et/ou l'élément d'appui (108t) est réalisé d'une seule pièce avec une bride de mécanisme (30t) pour supporter la contre-butée (26t) dans au moins un sens de rotation (18t, 20t).
  27. Machine-outil à main selon l'une quelconque des revendications précédentes, caractérisée en ce que la contre-butée (26t) est disposée de manière à pouvoir être vissée sur une bride de mécanisme (30t).
  28. Machine-outil à main selon l'une quelconque des revendications précédentes, caractérisée en ce que la contre-butée (26t) est formée d'un matériau qui est différent d'un matériau d'une bride de mécanisme (30t).
  29. Machine-outil à main selon l'une quelconque des revendications précédentes, caractérisée en ce que la contre-butée (26t) présente un renfoncement (116t) qui est disposé dans une région de contact (118t) pour la butée (24t).
EP08804856.6A 2007-11-27 2008-09-29 Machine-outil à main Active EP2214866B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007057032A DE102007057032A1 (de) 2007-11-27 2007-11-27 Handwerkzeugmaschine
PCT/EP2008/062994 WO2009068341A1 (fr) 2007-11-27 2008-09-29 Machine-outil à main

Publications (2)

Publication Number Publication Date
EP2214866A1 EP2214866A1 (fr) 2010-08-11
EP2214866B1 true EP2214866B1 (fr) 2013-06-19

Family

ID=40345010

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Application Number Title Priority Date Filing Date
EP08804856.6A Active EP2214866B1 (fr) 2007-11-27 2008-09-29 Machine-outil à main

Country Status (6)

Country Link
US (1) US8500521B2 (fr)
EP (1) EP2214866B1 (fr)
CN (1) CN101878093B (fr)
DE (1) DE102007057032A1 (fr)
RU (1) RU2492988C2 (fr)
WO (1) WO2009068341A1 (fr)

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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

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US8690637B2 (en) * 2008-12-08 2014-04-08 Toyota Motor Engineering & Manufacturing North America, Inc. Flex-arm devices and methods
DE102009028404A1 (de) * 2009-08-10 2011-02-17 Robert Bosch Gmbh Werkzeugmaschine mit einer Schutzhaube
JP5579575B2 (ja) * 2010-11-02 2014-08-27 株式会社マキタ ディスクグラインダ
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 (de) 2014-12-15 2015-01-16 Robert Bosch Gmbh Handwerkzeugmaschine
JP6634248B2 (ja) 2015-09-10 2020-01-22 株式会社マキタ グラインダ及びカバー
JP6667236B2 (ja) 2015-09-10 2020-03-18 株式会社マキタ グラインダ、カバー及びカバーセット
JP6632840B2 (ja) * 2015-09-10 2020-01-22 株式会社マキタ グラインダ
JP6307787B1 (ja) * 2017-05-26 2018-04-11 株式会社ナカヤ ガード装着機構
JP6982991B2 (ja) * 2017-06-20 2021-12-17 株式会社マキタ グラインダ
DE102017213743A1 (de) * 2017-08-08 2019-02-14 Robert Bosch Gmbh Schutzvorrichtung für eine Handwerkzeugmaschine
CN112223119A (zh) * 2020-10-20 2021-01-15 上海波邦电控科技发展有限公司 一种角磨机防尘罩

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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
CN101878093A (zh) 2010-11-03
EP2214866A1 (fr) 2010-08-11
CN101878093B (zh) 2014-01-15
US8500521B2 (en) 2013-08-06
RU2010125770A (ru) 2012-01-10
US20100304648A1 (en) 2010-12-02
DE102007057032A1 (de) 2009-05-28
WO2009068341A1 (fr) 2009-06-04
RU2492988C2 (ru) 2013-09-20

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