EP2214866A1 - Machine-outil à main - Google Patents

Machine-outil à main

Info

Publication number
EP2214866A1
EP2214866A1 EP08804856A EP08804856A EP2214866A1 EP 2214866 A1 EP2214866 A1 EP 2214866A1 EP 08804856 A EP08804856 A EP 08804856A EP 08804856 A EP08804856 A EP 08804856A EP 2214866 A1 EP2214866 A1 EP 2214866A1
Authority
EP
European Patent Office
Prior art keywords
stop
counter
hand tool
tool according
housing
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.)
Granted
Application number
EP08804856A
Other languages
German (de)
English (en)
Other versions
EP2214866B1 (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

Links

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.
  • a protective device On the flange neck a protective device is received, which is rotatable in the circumferential direction.
  • a latching lever To lock the directions of rotation of the protective device, a latching lever is provided which generates a positive connection with the protective device in its rest position.
  • the invention relates to a hand tool, in particular an angle grinder, with a housing having a flange neck, with a recordable on the flange neck protection device which is rotatable in the circumferential direction, and with at least one device for locking at least one direction of rotation of the protective device.
  • the device for blocking comprises at least one stop and at least one counter-stop cooperating with the stop.
  • the protective device is intended to prevent the user of the power tool in the event of a bursting of the grinding wheel,
  • the device according to the invention makes it possible to prevent twisting of the protective device or to reduce energy consumption in a "burst-wheel case” Stop the defined location.
  • the stops represent the last possible and desired rotational position of the protective device
  • Embodiment of the power tool allows the production of a simple and inexpensive locking device. There is no additional separate locking device necessary, since only the necessary for the locking of the protective device components are provided on parts of the hand 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 operation of a hand tool machine in which only energy from parts in contact with the protection device acts on the protection device up to a predetermined value.
  • Emergency operation is understood to mean operation of the handheld power tool in which energy of parts in contact with the protection device acts above the predetermined value on the protection device.
  • 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 In operation zerborstenen disc, such as a grinding wheel, a cutting disc, etc., can be advantageously braked or a
  • 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 is between flange neck and
  • 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 is in normal operation, ie at an energy shock below the predetermined value, fixed to the flange neck or coupled to the housing and performs only in emergency mode, ie at a power surge above the predetermined value, a rotational movement relative to the flange neck or housing.
  • Angle range perform a relative movement to each other. This absorbs some of the energy and reduces the velocity of the fragments leaving the guard.
  • 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 called
  • a tool manufacturer thus has the possibility of determining the burst-wheel stops in a suitable position that is safe for the user, this position can allow a maximum allowable angle of rotation of the protective device, but taking into account If the user does not get injured when the disc bursts, if a user changes the position of the burst-wheel
  • the tool manufacturer can encode the permissible positions. 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.
  • 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 the maximum permissible angle of rotation of the protective device, but taking into account that the user is not injured when the disc bursts. If a user can choose 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. 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 gear flange. By integrating the attachment in the existing components, can be dispensed with additional fastening means, resulting in a more cost-effective production of the power tool. In addition, 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.
  • 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.
  • 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.
  • Block 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 can be achieved on the transmission flange.
  • 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 at annen hit the attack on the counter-attack, achieved while damaging the
  • Counterstop be 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 occurring in particular 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 gearbox 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 for attachment of the counterstop to the gearbox flange is also preferably provided for fastening the gearbox flange to the handheld power tool or to its 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 gearbox 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 an exploded view of a detail of a hand-held power tool with a protective device which can be rotated in the peripheral direction
  • FIG. 3 shows a locking device in a second embodiment, in which a fastening screw serves as a counter-stop
  • FIG. 4 shows a locking device in a third embodiment, in which the housing-fixed counter-stop additionally serves as a hold-down for the protective device,
  • FIG. 5 shows 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 shows a locking device in a fifth embodiment, wherein the
  • FIG. 7 shows a locking device in a sixth embodiment, in which a
  • Housing element is adjustably mounted on a housing of the power tool
  • FIG. 8 shows a locking device in a seventh embodiment, in which an insert part having a counter-stop has projections which, in FIG.
  • Recesses can be inserted in the gearbox flange
  • FIG. 9 shows a locking device in an eighth embodiment, in which a counter-stop insert is arranged under the gear flange
  • FIG. 10 shows a locking device in a ninth embodiment, in which a
  • FIG. 11 shows an alternative of the damping device according to FIG. 9,
  • FIG. 12 shows a further alternative of the damping device according to FIG. 9,
  • FIG. 13 shows a locking device in a tenth embodiment, in which a stop arranged on the tension band is designed as a damping device,
  • Fig. 14 shows a locking device in an eleventh embodiment, in which a counter-abutment ring member is pushed onto the flange neck
  • Fig. 15 a locking device in a twelfth embodiment, in which a
  • FIG. 16 shows an alternative of the counter-stop according to FIG. 14
  • FIG. 17 shows a further alternative of the counter-stop according to FIG. 14
  • FIG. 18 shows a blocking device in a thirteenth embodiment, in the counter-stop in one direction a longitudinal axis sprung, at the front of the
  • FIG. 19 shows 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 shows a variant of a boundary according to FIG. 18, FIG.
  • FIG. 21 shows a further variant of a boundary according to FIG. 18, FIG.
  • FIG. 22 shows a locking device in a fifteenth embodiment, in which a groove extends in an edge region of the flange neck
  • FIG. 23 shows a locking device in a sixteenth embodiment, in which the groove is formed by the flange neck and a disk element mounted on the flange neck
  • FIG. 23 shows a locking device in a sixteenth embodiment, in which the groove is formed by the flange neck and a disk element mounted on the flange neck
  • FIG. 24 shows a locking device in a seventeenth embodiment, in which the groove runs in the gearbox flange
  • FIG. 25 shows a locking device in an eighteenth embodiment, in which the groove is formed by the flange neck and a plate element, which is pushed onto the flange neck and fastened to the gear flange,
  • 26 shows a locking device in a nineteenth embodiment, in which 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 of the counter-stop from FIGS. 27a, 27b in a first perspective view (FIG. 28a) and a second perspective view (FIG. 28b), FIG.
  • 29a, 29b show a partial region of the gearbox flange from FIGS. 27a, 27b in a first perspective view (FIG. 29a) and a second perspective view (FIG. 29b) and FIG
  • FIG. 30a, 30b the locking device of Figures 27a, 27b with a mounted protection device.
  • FIG. 1 shows a handheld power tool shown in partial detail.
  • 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 takes on its outer periphery a protective device 16, in the form of a
  • 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 particularly advantageous shielding of sparks, material particles and / or high-energy radially outwardly moving fragments of a burst tool is achieved by sparks and / or any material particles forward, away be managed by the operator.
  • 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 fixed in the following embodiments by clamping the clamping collar designed as a clamping band 28 by frictional engagement on the flange neck 12, similar to a pipe clamp, with any other a professional apparent sense de fixing the protective device 16 on the flange neck 12 is conceivable , For example, that can
  • Tension also be present as a separate part, which is wrapped around the receiving collar of the protection 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 handheld power tool 10 comprises the tensioning band 28 and a tensioning unit 66.
  • the tensioning band 28 is of annular design and is preferably welded to the base body 58. Basically, more, the
  • the annular tension band 28 is tensioned around the flange neck 12 by means of the tensioning unit 66, in which a circumference of the annular tension band 28 is clamped over the tensioner 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 counter-stop 26 cooperating with the stop 24, the stop 24 being fixed in a protective device and the counter-stop 26 being fixed to the hand-held power tool 10 fixed to the housing.
  • 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 according to FIGS. 2 to 30b are configured in such a way that during emergency operation of the hand-held power tool
  • 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 twisting 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, attached to the clamping band 28 component as well as integral with the protective device 16.
  • 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.
  • 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 can be arranged adjustably on the housing 14 and / or adjustably 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" upon encountering each other
  • one end 68a of the tensioning band 28a is provided as a stop 24a, but the position of the stop 24a is in this and all other variants not necessarily to see at one end 68a of the tension band 28a, but also another reasonable position can be selected.
  • FIG. 3 shows a blocking 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 "statically" formed relative to the "rotating" protective device 16b.
  • a transmission flange mounting bolt 76b is an elongated, fixed one
  • FIG. 4 shows a blocking 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 protective device-resistant counter-stop can thus be intercepted in progressivelyiler- or user-desired positions in the burst-wheel case.
  • the housing element can also be designed as a ring segment 34e according to FIG.
  • Figure 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.
  • the ring segment 34e it may also be an annular plate element with a hook notch.
  • FIG 7 shows a partially illustrated locking device 22f in a sixth embodiment.
  • a fixed 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 illustrated here) can also be carried out by making them into oblong holes, whereby an adjustment can be carried out by simply loosening the screws.
  • Figure 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 part 34g has projections 36g, which are seated in corresponding recesses 38g in the gearbox flange 30g and force a positional fixation of the insert part 34g on the gearbox 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.
  • a housing member 34h formed as an insert is under the transmission flange, not shown, and on the transmission housing 32h, i. arranged between the transmission flange and gear housing 32h, wherein the insert 34h as a thin sheet metal part, but also as a molded part is conceivable.
  • 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.
  • Figure 10 shows a partially illustrated locking device 22i in a ninth embodiment.
  • a counter-stop 26i which is attached to the gear flange 30i and is preferably screwed on is provided, which has a stop body 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 4Oi to be integrated into the recess 84i, such as a rubber buffer 4Oi 'or a spiral spring 4Oi. "In the recess 84i of the abutment main body 82i, different" dampers "may be provided by the manufacturer or the customer "be used.
  • the protective device not shown here with its counter-stop runs in a burst-wheel movement on the used damping device 4Oi and is braked by this energy absorbing.
  • 11 and 12 show two further alternatives of the counter-abutment 26i ', 26i ".
  • the counter-abutment 26i' itself is designed as a damping device 4Oi 'in that the preferably one-piece counter-abutment 26i' is made plastically or elastically deformable, whereby any deformation A lasting deformation would basically have the advantage that a burst-wheel incident for the
  • the counter-abutment 26i is itself designed as a damping device 4Oi", specifically 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 4Oj.
  • a non-integral and thus mounted stop with damping device would also be conceivable.
  • the stop 24j forming the damping device 40j is a pleat element, in which the kinetic energy in a burst-wheel case is reduced by the permanent or resilient deformation of the pleat element. Again, it should be noted that a permanent deformation has the advantage that a burst-wheel incident can be detected.
  • Figures 14 to 17 show locking devices 22, in which the housing-fixed counter-stop 26 is provided on the flange neck 12.
  • Figure 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 34 k is as one on the
  • 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.
  • a toothing would be conceivable. In a burst-wheel case of not shown stop of the protection device runs on the
  • Figure 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 stop can also be provided as a separate part 241 'on the tension band 281'.
  • the stop could be used by a permanent deformation, after a burst-wheel case, as a mechanical "indicator.” This indication could be used to detect the occurrence of the burst-wheel case 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 twisting of the protective device 16 in a direction of rotation 18 or 20, while in the opposite direction 20 or 18 a
  • Figure 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 transmission 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 limited in the circumferential direction 18n, 2On.
  • Figure 22 shows a locking device 22o in a fifteenth embodiment.
  • a groove serving as a counter-stop 26o is provided on the flange neck 12o, which passes through a groove
  • Groove 26o is formed, which extends on the outer circumference in an edge region of the flange neck 12o in the circumferential direction 18o, 2Oo limited, wherein the recess 22o not only outwardly but also upwardly open.
  • Figure 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 blocking 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 blocking 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.
  • Figure 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.
  • Figures 27a and 27b show a partially illustrated device 22t for blocking in another to the figures 2 to 26 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 bolted in a mounted state with the gear flange 30t.
  • the receiving unit 104t has a recess 106t on the gear flange 30t (FIGS. 29a and 29b).
  • the recess 106t or the receiving unit 104t is arranged on a base element 120t of the gearbox flange 30t, wherein the base element 120t extends outward in a radial direction 110t from a flange neck 12t and substantially perpendicular to the flange neck 12t or to an axis 56 an 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 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 (FIGS. 28a and 28b), through which a fastening screw 134t engages in an assembled state and is screwed to the transmission housing 32 (FIGS. 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 due to 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 counterpart stop 26t in the case of a bursting tool (FIGS. 30a and 30b).
  • 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 Figures 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 Figures 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-abutment 26t (FIGS. 28a, 28b, 30a and 30b).
  • the recess 116t is disposed on a radially outer edge portion 156t of the stopper member 146t and extends in a mounted state of the counterstop 26t with the gear flange 30t of one
  • Base body 144t remote end portion 158t up to a base body 144t facing away from end portion 160t of the support member 112t.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Gear Transmission (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Harvester Elements (AREA)

Abstract

L'invention concerne une machine-outil à main, notamment une meuleuse d'angle (10), comportant : un boîtier (14) présentant un collet de bridage (12) ; un dispositif de protection (16), qui peut être reçu sur le collet de bridage (12) et qui est rotatif en direction circonférentielle (18, 20) ; et au moins un dispositif (22) pour bloquer au moins un sens de rotation (18, 20) du dispositif de protection (16). Selon l'invention, le dispositif de blocage (22) comprend au moins une butée (24), et au moins une contre-butée (26) coopérant avec la butée (24).
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 true EP2214866A1 (fr) 2010-08-11
EP2214866B1 EP2214866B1 (fr) 2013-06-19

Family

ID=40345010

Family Applications (1)

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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EP2447003A3 (fr) * 2010-11-02 2013-12-18 Makita Corporation Meuleuses à disque

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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
DE102012214834A1 (de) * 2012-08-21 2014-02-27 Robert Bosch Gmbh Schutzhaubenvorrichtung
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
JP6632840B2 (ja) * 2015-09-10 2020-01-22 株式会社マキタ グラインダ
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
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
US20220063047A1 (en) 2020-08-28 2022-03-03 Black & Decker Inc. Retention flange for power tool
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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US9102032B2 (en) 2010-11-02 2015-08-11 Makita Corporation Disc grinders

Also Published As

Publication number Publication date
CN101878093B (zh) 2014-01-15
US8500521B2 (en) 2013-08-06
EP2214866B1 (fr) 2013-06-19
WO2009068341A1 (fr) 2009-06-04
US20100304648A1 (en) 2010-12-02
DE102007057032A1 (de) 2009-05-28
RU2492988C2 (ru) 2013-09-20
RU2010125770A (ru) 2012-01-10
CN101878093A (zh) 2010-11-03

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