EP2821180A1 - Machine-outil dotée d'un capot de protection - Google Patents

Machine-outil dotée d'un capot de protection Download PDF

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Publication number
EP2821180A1
EP2821180A1 EP13191932.6A EP13191932A EP2821180A1 EP 2821180 A1 EP2821180 A1 EP 2821180A1 EP 13191932 A EP13191932 A EP 13191932A EP 2821180 A1 EP2821180 A1 EP 2821180A1
Authority
EP
European Patent Office
Prior art keywords
machine tool
protective hood
tool
recess
neck portion
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.)
Withdrawn
Application number
EP13191932.6A
Other languages
German (de)
English (en)
Inventor
Martin Pietzsch
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.)
Metabowerke GmbH and Co
Original Assignee
Metabowerke GmbH and Co
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 Metabowerke GmbH and Co filed Critical Metabowerke GmbH and Co
Publication of EP2821180A1 publication Critical patent/EP2821180A1/fr
Withdrawn legal-status Critical Current

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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
    • 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 machine tool according to the preamble of claim 1, in particular an angle grinder, with a motor driven by a tool spindle tool and at least partially surrounded protective hood, the guard is without tools mounted on the machine tool and includes a substantially disc-shaped part and a extending therefrom edge portion which is capable of embracing the peripheral edge of the tool, wherein on the disc-shaped part of the protective cover an open-edged circular recess is formed, which is able to embrace a neck portion of the machine tool in an assembled state of the protective hood on the machine tool.
  • a tool-free attachment of the guard on the machine tool is useful in practice to ensure a fast mounting and dismounting of the guard on the machine tool, whereby the handling of the machine tool is simplified. Accordingly, numerous possibilities of tool-free fastening of protective hoods on angle grinders have already become known in the past.
  • the Applicant's patent application discloses DE 10 2008 059 249 A1 Such a tool-attachable protective hood, which realizes a particularly space-saving attachment of the guard due to their specific design.
  • the guard is positioned to overhang the user-facing half-side of the tool. In this way, the user is protected from the chips and dirt particles produced during grinding or cutting with the machine tool, which would otherwise be thrown in his direction.
  • the protective hood about an axis of rotation or central longitudinal axis relative to the Machine tool to be rotated, wherein the axis of rotation usually coincides with the axis of rotation of the tool spindle or is formed at least parallel to this.
  • the machine tool further comprises a securing device for securing the mounted protective hood on the machine tool, which comprises at least one blocking element which is formed on the protective hood and which cooperates with a guide element on the neck portion of the machine tool in such a way that the protective hood only in a defined Assemble and disassemble relative position to the machine tool.
  • the defined assembly and disassembly position of the protective hood can be chosen so that it is in a conventional use of the machine tool in contradiction to a normal operating position of the protective hood relative to the machine tool and thus is not used during operation of the protective hood.
  • the defined assembly and disassembly position may be one or more such positions of the protective hood relative to the machine tool.
  • Protective hoods of the type mentioned are usually designed so that they cover only a portion of the drivable tool, wherein the disc-shaped part of such protective hoods is usually formed in the shape of a circle segment which describes an angle of about 150 ° to 180 °.
  • the open-edged circular recess for mounting and dismounting the guard is arranged substantially concentric with the disc-shaped part of the guard on this. Furthermore, it has a certain diameter which substantially corresponds to (or is greater than) the outer diameter of the neck portion, and an opening of the recess through which the neck portion of the machine tool can be pushed during assembly of the guard.
  • the open-edged circular recess may also comprise a crimped portion or a collar.
  • the protective hood can thus be pushed onto the neck section of the machine tool in the plane of the disk-shaped part of the protective hood and then, as a rule, rotated into the position desired by the user relative to the neck section.
  • the neck portion of the machine tool may be formed by a portion of a housing of the machine tool, for example a gear housing of the machine tool, or by a separate component, which is attachable to the housing of the machine tool.
  • the at least one blocking element comprises a boundary of the open-edged recess which limits the opening of the recess relative to the diameter of the recess in such a way that the opening is smaller than the diameter. Even with such a development of the invention corresponds to the Diameter of the recess substantially to the outer periphery of the part of the neck portion of the machine tool to which the protective cover is to be attached.
  • the boundary of the open-edged recess can describe a circular arc of at least 180 ° and have at least one projection which extends in the plane of the disk-shaped part of the protective hood and reduces the opening of the recess relative to the diameter of the open-edged recess.
  • the at least one blocking element comprises at least one projection which extends out of the plane of the disk-shaped part of the protective hood, wherein the at least one projection is preferably provided in the region of the edge-open boundary.
  • the statement "in the region of the edge-open boundary” does not necessarily mean that the projection must extend directly from the edge-open boundary, but only in an adjacent region thereof.
  • the guide element comprises a circumferential, viewed in cross-section circular groove on the neck portion of the machine tool, which allows an axial securing of the guard, the groove having at least one flattened in cross-section.
  • cross section in this context denotes a sectional view in a plane perpendicular to the central longitudinal axis of the tool spindle.
  • the guard is thus inserted with its open-edged recess in the circular in cross-section circular groove on the neck portion of the machine tool, wherein the at least one flat is positioned on the groove in the mounting position of the guard relative to the machine tool so the opening, which is smaller than the diameter of the recess, of the open-edged recess can be pushed along the flattening onto the neck section.
  • the lateral boundaries of the groove limit the axial freedom of movement of the deferred guard.
  • the guide element comprises a circumferential, in cross-section circular groove on the neck portion of the machine tool, which allows axial securing of the guard, as well as the neck portion in cross-section considered a flattening or recess, in the mounting position of the guard relative corresponds to the machine tool with the at least one axial projection.
  • the neck portion in the region of the circumferential groove has a diameter which substantially corresponds to the diameter of the open-edged recess.
  • the protection of the protective hood on the neck portion in the axial direction is also carried out by the lateral (acting in the axial direction) boundary of the circular groove, while the radial securing is effected by the at least one axial projection and the at least one flattening or recess on the neck portion.
  • the diameter is reduced by the flattening or recess on the neck portion in such a way that the axial projection can be pushed in the mounting position of the guard relative to the machine tool on the flattening or recess along the neck portion and the axial projection at a slight twisting of the protective hood relative to the neck portion, capable of supporting radially on the neck portion.
  • a groove may be provided on the neck portion which, unlike the circular groove, does not extend radially but axially.
  • the groove described above regardless of their specific configuration, also be formed on the protective hood itself, in which a corresponding flange-like element of the neck portion for axial securing of the protective hood can be inserted.
  • the securing device for securing the guard on the machine tool additionally includes a lock that allows a determination of the guard in a desired angular position relative to the machine tool and a rotation of the guard to an axis parallel to the tool spindle is able to prevent, wherein the lock comprises a locking lever which is able to rest arresting in a locking position on the protective hood.
  • the locking lever may be resiliently biased in the direction of its locking position.
  • the protective hood has at its edge part or at its disc-shaped part a plurality of circumferentially distributed recesses or depressions with which the locking lever is able to cooperate in its locking position for locking the protective hood.
  • FIGS. 1 to 2c show a machine tool according to the invention according to a first embodiment, wherein was omitted for simplicity to a representation of a major part of the machine tool and the presentation is limited to the relevant features of the invention.
  • FIGS. 3 to 4c Accordingly, a second embodiment of the machine tool according to the invention is shown, wherein matching features are provided with the same reference numerals, which, however, the digit "1" is prefixed.
  • FIGS. 5a to 5c show further embodiments of protective hoods of a machine tool according to the invention, in which analogous matching features are provided with the same reference numerals, which, however, the numbers "2", "3" or "4" are prefixed.
  • the machine tool is indicated generally by reference numerals 10 and 110 respectively in the figures and comprises a tool spindle 12 which is drivable via a motor (not shown) to rotate about its central longitudinal axis L and at its free end 12a (in FIG FIG. 1 the upper end) a disk-shaped tool (not shown) can be mounted rotationally fixed.
  • a driven angle grinder in which in a known manner, a driving shaft (not shown) of the motor with a ring gear (not shown) of an angle gear assembly (not shown) of the angle grinder cooperates and in this way is able to transmit the driving torque to the tool spindle 12.
  • the grinding tool On the free end 12a of the tool spindle 12, the grinding tool (not shown) can be postponed, which then abuts a support flange portion 50.
  • the fixation can be done in a conventional manner by a clamping element, such as a clamping nut (not shown), which braces the disc-shaped tool against the tool flange 50.
  • the angle grinder 10 further comprises a protective hood 14.
  • the protective hood 14 comprises, as shown in the figures, a disk-shaped part 16 and a peripheral part 18 which extends radially outward of the disk-shaped part 16 axially (with respect to the longitudinal axis L of the tool spindle 12).
  • the protective hood 14 As in the isometric view of FIG. 1
  • it comprises an open-edged recess 20, which is formed substantially centrally in the disk-shaped part 16 of the protective hood 14.
  • the edge portion 18 of the protective hood 14 does not necessarily extend axially at a right angle from the disk-shaped part 16 of the protective hood 14. Alternatively, the angle may also be slightly larger.
  • the edge portion 18 in the in the Figures 1 to 5c illustrated embodiment additionally cranked radially inwardly and engages in a sense on the tool spindle 12 recorded disc-shaped tool (not shown).
  • the FIGS. 1 to 4c are recesses 48 in the cranked portion of the edge portion 18 in the circumferential direction distributed trained.
  • the recesses 48 are formed by embossing, that is, by a material displacing deformation of the cranked region.
  • the depressions may also be as in the FIGS. 5a to 5c be formed in other areas of the protective hood 14, in particular on the disc-shaped part 16.
  • a circumferentially continuous groove 28 is formed whose groove width substantially corresponds to the thickness of the edge-open recess 20 bounding edge portion 24 of the disc-shaped part 16 of the protective cover 14.
  • the protective hood can be pushed onto the neck section 22 in the direction of the tool spindle 12 so that the edge section 24 of the disk-shaped part 16 of the protective hood 14 can engage in this groove 28.
  • FIGS. 2a to 2c clearly shows the boundary or the limiting edge portion 24 of the open-edged recess 20 describes a circular arc of more than 180 °, whereby the opening O of the open-edged recess 20 has a smaller extension than the diameter D of the open-edged recess 20 (see. FIG. 2a ).
  • the outer diameter of the neck portion 22 in the region of the groove 28 is substantially identical to the inner diameter D of the open-edged recess 20. Accordingly, the protective hood 14 can be pushed onto the neck portion 22 only in that the neck portion 22 has a smaller diameter in the region of the groove 28, at least in a defined relative position of the protective hood 16 to the machine neck 22, which may not be greater than the opening O.
  • This is in the first embodiment of the Figures 1 to 2c achieved in that the groove 28 in cross section has two flats 30 which are formed parallel to each other.
  • the protective hood 14 can be rotated about an axis of rotation relative to the tool spindle, the axis of rotation coinciding with the central longitudinal axis L of the tool spindle. Because the opening O of the open-edged recess 20 is smaller than the outer diameter of the neck portion 22 in the region of the groove 28, a radial securing of the protective hood 14 on the machine neck 22 in all positions relative to the machine neck 22 is ensured via the boundary 24, except in FIG the defined mounting position (see position of the guard 14 in the Figure 2c ). In a position rotated by 180 ° with respect to this position, the protective hood 14 is mounted relative to the machine neck 22 (see the position of the protective hood 14 in FIG. 2a ), the radial securing via an additional lock 40, to which reference is made to the second embodiment closer reference.
  • the second embodiment of the FIGS. 3 to 4c differs in this respect from the first embodiment, as that acting as a blocking element boundary or the limiting edge portion 24 of the open-edged recess 20 of the first embodiment now only describes an angle of substantially 180 ° and additional projections 152 are provided for radial securing, the extend axially (relative to the central longitudinal axis L of the tool spindle 12) of the disc-shaped part 116 of the protective hood 114. These are formed in the illustrated embodiment by bending over a portion of the disk-shaped part 116 of the protective hood 114.
  • alternative embodiments are also conceivable.
  • a projection extends essentially in the axial direction (with respect to the longitudinal axis L) from the disk-shaped part 116.
  • the axial Protrusions 152 thereby form locking elements which can interact with a corresponding guide element on the machine neck 122.
  • This guide element is in the second embodiment of FIGS. 3 to 4c not formed by flattening in the groove 128, but by flats 130 (see. Figures 4a-4c ) on a groove 128 laterally limiting, upper cover plate 154.
  • the operation otherwise corresponds substantially to the first embodiment.
  • Both embodiments of a machine tool 10 and 110 according to the invention additionally have a detent 40 or 140.
  • This can on the one hand form a radial securing of the protective hood 14 or 114 in an angular position rotated by 180 ° relative to the mounting position of the protective hood 14, 114 (cf. FIGS. 2a and 4a ). In essence, however, this serves in particular the rotation of the rotatable about the axis L protective hood 14, 114 relative to the machine neck 22, 122.
  • the axial securing (relative to the longitudinal axis L) of the guard 14, 114 via the lateral boundaries of the groove 28, 128 on the machine neck 22 and 122, respectively.
  • the lock 140 (and similarly the lock 40) has a locking lever 142, which is able to engage with its front end portion in the recesses 148 in the edge portion 118 of the protective cover 114 and thereby can provide a rotation of the protective hood 114 relative to the machine neck 122.
  • the detent 140 is disposed on an extension portion 134 of the neck portion 122 which extends radially. At the free end of the extension part 134, two legs 132 are arranged, which define a recess 136 between them. The legs 132 serve to support a pivot axis 142a about which the locking lever 142 can be pivoted to bring it into its locking position or move out of this position.
  • the locking lever 142 is resiliently biased by a torsion spring or coil spring 144 in the direction of its locking position and can be manually actuated by an operator via an actuating portion 146, ie pivoted out of its locking position about the pivot axis 142a.
  • the pivot axis 42a is for example in the FIG. 1 shown schematically).
  • FIGS. 5a to 5c Further alternative embodiments of a protective hood are shown, which differ from the first two embodiments in that the recesses 248, 348 and 448 are arranged in a different region of the protective hood 214, 314 and 414, for example on an additional peripheral edge 438 which extends extends axially from the outside of the disc-shaped part 416.
  • an alternative embodiment of a detent 240 is shown, in which the pivot axis 242a is not perpendicular to the central longitudinal axis L, but parallel to this.
  • a corresponding lock can of course also on the embodiment of FIGS. 1 to 4c apply.
  • the arrangement of the recesses 248, 348 and 448 can be applied to each of the embodiments of FIGS. 1 to 4c be applied, since this is of course technically independent of the radial securing of the guard on a machine neck.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
EP13191932.6A 2013-07-04 2013-11-07 Machine-outil dotée d'un capot de protection Withdrawn EP2821180A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102013213062 2013-07-04

Publications (1)

Publication Number Publication Date
EP2821180A1 true EP2821180A1 (fr) 2015-01-07

Family

ID=49552215

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13191932.6A Withdrawn EP2821180A1 (fr) 2013-07-04 2013-11-07 Machine-outil dotée d'un capot de protection

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EP (1) EP2821180A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4423889C1 (de) * 1994-07-07 1995-06-22 Atlas Copco Elektrowerkzeuge Schutzhaube für eine Handwerkzeugmaschine
DE102008059249A1 (de) 2008-11-20 2010-05-27 Metabowerke Gmbh Winkelschleifgerät mit Schutzhaube

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4423889C1 (de) * 1994-07-07 1995-06-22 Atlas Copco Elektrowerkzeuge Schutzhaube für eine Handwerkzeugmaschine
DE102008059249A1 (de) 2008-11-20 2010-05-27 Metabowerke Gmbh Winkelschleifgerät mit Schutzhaube

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