EP2607014B1 - Dispositif de blocage de tournevis de protection - Google Patents

Dispositif de blocage de tournevis de protection Download PDF

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Publication number
EP2607014B1
EP2607014B1 EP12191781.9A EP12191781A EP2607014B1 EP 2607014 B1 EP2607014 B1 EP 2607014B1 EP 12191781 A EP12191781 A EP 12191781A EP 2607014 B1 EP2607014 B1 EP 2607014B1
Authority
EP
European Patent Office
Prior art keywords
clamping
unit
rotation
twist prevention
protective
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.)
Not-in-force
Application number
EP12191781.9A
Other languages
German (de)
English (en)
Other versions
EP2607014A3 (fr
EP2607014A2 (fr
Inventor
Joachim Schadow
Rainer Vollmer
Sinisa Andrasic
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 EP2607014A2 publication Critical patent/EP2607014A2/fr
Publication of EP2607014A3 publication Critical patent/EP2607014A3/fr
Application granted granted Critical
Publication of EP2607014B1 publication Critical patent/EP2607014B1/fr
Not-in-force 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
    • B24B23/028—Angle tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • 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 guard anti-rotation device of a machine tool.
  • a device according to the preamble of claim 1 is for example from the DE 10 2008 002451 A1 known.
  • a guard anti-rotation device of a machine tool in particular an angle grinder, known, which has a tensioning a guard unit clamping unit, which has a clamping element and cooperating with the clamping element further clamping element, a rotation locking unit, which has a VerFréselement, and a movement coupling unit to a movement the anti-rotation element in response to a movement of the clamping element and / or the further clamping element comprises.
  • the invention is based on a guard anti-rotation locking device of a machine tool, in particular an angle grinder, with at least one clamping unit provided for clamping a guard unit comprising at least one clamping element and at least one further clamping element cooperating with the clamping element, with at least one anti-rotation unit having at least one anti-rotation element , in particular at least one anti-rotation element formed separately from the tensioning element and separate from the further tensioning element, and with at least one movement coupling unit for movement of the anti-rotation element in response to movement of the tensioning element and / or the further tensioning element, in particular in a dependence of movement of the tensioning element relative to another clamping element.
  • the movement coupling unit comprises at least one energy storage element.
  • the movement coupling unit is provided in at least one operating state, at least to move the anti-rotation element against a force acting on the anti-rotation element force of the energy storage element in a Verwar Anlagens ein.
  • clamping unit should in particular define a unit which secures a protective hood unit by means of positive locking and / or by means of a force fit to protect an operator during machining of a workpiece on the machine tool, in particular on a clamping neck of the machine tool.
  • a clamping force is generated for a tightening of the protective hood unit.
  • the tensioning element can in this case be designed as a tensioning screw, as a tensioning lever, as a bayonet locking element, etc.
  • the further clamping element is preferably designed as a tension band.
  • the clamping band is preferably fixed by means of a cohesive connection, such as by means of a welded connection, an adhesive connection, etc., to the protective hood unit.
  • the clamping element designed as a further clamping element is fixed by means of another, a person skilled in the sense appearing connection to the protective hood unit.
  • anti-rotation unit is intended here to define in particular a unit which largely prevents rotation of the protective hood unit in a mounted state relative to a clamping neck of the machine tool in the event of damage to a tool holder of the machine tool arranged machining tool by means of a positive and / or non-positive connection, in particular in addition to the clamping unit.
  • a positive and / or non-positive connection of the anti-rotation unit is achieved by engaging the anti-rotation in a arranged on the clamping neck of the machine tool Verfitterssaus strictly supra.
  • a "damage case of a machining tool” is to be understood here in particular as a bursting of the machining tool during operation of the machine tool, wherein individual machining tool parts are thereby thrown outwards due to a rotation of the machining tool.
  • a Position of the protective hood unit relative to the clamping neck of the machine tool during the damage of the machining tool by means of the anti-rotation device largely maintained.
  • movement coupling unit should in particular define a unit which is provided, at least one movement of an element, in particular of the tensioning element and / or the further tensioning element, along at least one direction of movement in at least one movement of a separate element formed separately from the element, in particular of the anti-rotation element, to be transferred along at least the direction of movement and / or along at least one further direction of movement.
  • An “energy storage element” is to be understood here as meaning, in particular, an element which is intended to store potential energy against a force as a result of a movement of a further element, in particular of the anti-rotation element, and this in at least one operating state in the form of kinetic energy to the anti-rotation element leave.
  • the energy storage element may in this case be designed as a gas spring, as an oil pressure spring, etc.
  • the energy storage element has another, a skilled person appear appropriate design.
  • an effective and in particular secure protection of an operator of the machine tool in front of the machining tool rotating during operation of the machine tool and / or in particular in case of damage of the machining tool, such as in the case of bursting machining tool, in front of the operator flying parts of the machining tool can be achieved.
  • advantageously a secure movement of the anti-rotation element can be achieved in a Verwarschommes ein due to the movement dependence of the anti-rotation of the clamping element and / or the other clamping element.
  • an at least substantially automatic movement of the anti-rotation element can advantageously be achieved as a result of a tightening of the protective hood unit on a clamping neck of the machine tool.
  • advantageously a high level of operating comfort can be achieved.
  • the movement coupling unit is provided in at least one operating state, the anti-rotation element in response to a change in a distance between a clamping surface of the Clamping element and a clamping surface of the further clamping element to move at least in a Verwarêtsarretier ein.
  • the anti-rotation element is moved at least substantially transversely to a direction of rotation securing movement of the anti-rotation element.
  • the anti-rotation movement direction of the anti-rotation element preferably extends in a state of the protective hood unit clamped to the clamping neck of the machine tool by means of the clamping unit at least substantially perpendicular to an output axis of an output unit of the machine tool.
  • the anti-rotation movement direction runs along a radial direction of the output axis.
  • the movement coupling unit is preferably provided to the anti-rotation element in at least one operating state subsequent to a movement in a Verwar Anlagens sued the anti-rotation element in response to a change in a distance between a clamping surface of the clamping element and a clamping surface of the further clamping element at least along at least substantially transversely to the direction of rotation Move direction in an anti-rotation locking position.
  • an "anti-rotation locking position” is to be understood here in particular as a position of the anti-rotation element, in which the anti-rotation element is largely secured against movement against an anti-rotation movement direction along which the anti-rotation element is moved into the anti-rotation position.
  • the clamping surface of the clamping element and the clamping surface of the further clamping element are at least in an operating state along a at least in an at least substantially perpendicular to the output axis extending circumferential direction arranged relatively spaced.
  • the clamping surface of the clamping element and the clamping surface of the further clamping element to a clamping of the protective hood unit are moved towards each other.
  • an anti-rotation function and at the same time a further security function can advantageously be achieved by the movement of the anti-rotation element by means of the movement coupling unit, for example an axial securing function or a radial securing function of the anti-rotation element.
  • the movement coupling unit for example an axial securing function or a radial securing function of the anti-rotation element.
  • the energy storage element is supported with one end on the anti-rotation element and with another end on the other clamping element.
  • the end of the energy storage element is preferably fixed to the anti-rotation element form-fitting, non-positively and / or cohesively.
  • the other end of the energy storage element is preferably fixed in a form-fitting, non-positive and / or material fit to the other clamping element. It can thus be advantageously achieved an effect of a force of the energy storage element on the anti-rotation element.
  • the anti-rotation element is pivotally mounted at least relative to the clamping element and / or relative to the further clamping element.
  • the anti-rotation element is pivotally mounted due to a partial arrangement of the energy storage element on Verwarêtselement and a partial arrangement of the energy storage element on the further clamping element.
  • the anti-rotation element is preferably mounted pivotably relative to the clamping element and / or relative to the further clamping element by means of a bearing element of the anti-rotation unit.
  • a pivoting movement of the anti-rotation element can be achieved by means of the movement coupling unit in the anti-rotation position.
  • a space-saving arrangement of the anti-rotation element can be achieved on the clamping unit.
  • the energy storage element is designed as a spring element.
  • a "spring element” is to be understood in particular as a macroscopic element which has at least one extension that is elastically changeable by at least 10%, in particular by at least 20%, preferably by at least 30% and particularly advantageously by at least 50% in a normal operating state , And in particular generates a dependent on a change in the extension and preferably proportional to the change counterforce, which counteracts the change.
  • An “extension” of an element should, in particular, be understood to mean a maximum distance between two points of a vertical projection of the element onto a plane.
  • a “macroscopic element” is meant in particular an element with an extension of at least 1 mm, in particular of at least 5 mm and preferably of at least 10 mm become.
  • the spring element is designed as a spring plate.
  • the spring element is preferably designed as a leg spring or as a helical compression spring.
  • the spring element has another, a skilled person appear appropriate design, such as a design as Evolutfeder, as a plate spring, etc.
  • the further clamping element has at least one receiving region in which the anti-rotation element is at least partially disposed in an unlocking position of the anti-rotation element.
  • An anti-rotation area of the anti-rotation element is preferably arranged in the unlocking position of the anti-rotation element.
  • the receiving area is formed by a U-shaped portion of the further clamping element.
  • the receiving area is formed by a material recess in the further clamping element or the like.
  • the anti-rotation element has at least one axial securing region, which is provided in at least one operating state to at least largely prevent an axial movement of the anti-rotation element extending at least substantially transversely to an anti-rotation movement direction of the anti-rotation element.
  • the axial securing region preferably cooperates with a semicircular protective hood cover region of the protective hood unit to prevent as far as possible an axial movement of the anti-rotation locking element in at least one operating state.
  • an axial deflection of the anti-rotation element can advantageously be prevented in order to advantageously achieve a high degree of safety, in particular in the case of a damage of the machining tool, for an operator by means of the protective device of the anti-rotation device according to the invention.
  • the clamping unit comprises at least one screw unit for clamping the protective hood unit.
  • a "screw unit” is to be understood here in particular as a unit which has at least one element with at least one thread and another element corresponding to the element with at least one thread, which are intended, by means of cooperation, a clamping force to a clamping of the protective hood unit to create.
  • the screw unit comprises at least the clamping element, which is designed as a screw and a corresponding with the clamping element threaded element, which is designed as a nut.
  • the threaded element formed as a nut is preferably fixed in a form-fitting, non-positive and / or materially fixed manner to the further clamping element.
  • the threaded element is formed integrally with the further clamping element by being introduced with the screw formed as a clamping element corresponding threads directly into the further clamping element. It can be advantageously realized a low-cost clamping unit.
  • the clamping unit comprises at least one lever unit for clamping the guard unit.
  • a “lever unit” is to be understood here in particular as a unit which has at least one lever element which is provided to generate a clamping force for a tightening of the protective hood unit.
  • the lever unit comprises a lever element on which the clamping element is arranged eccentrically to a pivot axis of the lever element.
  • the lever unit can be configured as a toggle lever unit, as a parallelogram lever unit or as another lever unit that appears appropriate to a person skilled in the art.
  • a force transmission by means of a lever principle to a generation of a clamping force to a tightening of the protective hood unit can be achieved.
  • a tool-free clamping operation can be realized.
  • a high level of operating comfort can be achieved.
  • the invention is based on a machine tool system having at least the protective hood anti-rotation device according to the invention, with at least one machine tool, in particular an angle grinder, and with at least one protective hood unit.
  • the machine tool is preferred as a portable Machine tool, in particular as a portable, hand-held machine tool formed.
  • a "portable machine tool” is to be understood here in particular as meaning a machine tool for machining workpieces, which can be transported without transport machine by an operator.
  • the portable power tool has a mass which is less than 40 kg, preferably less than 10 kg and particularly preferably less than 7 kg.
  • FIG. 12 shows a machine tool system including a machine tool 12a, which is formed by a portable machine tool designed as an angle grinder, a protective hood unit 14a and a guard anti-rotation device 10a.
  • the guard anti-rotation device 10a of the machine tool system comprises at least one clamping unit 16a provided for clamping the guard unit 14a, comprising at least one clamping element 18a and at least one further clamping element 20a cooperating with the clamping element 18a, at least one anti-rotation unit 22a having at least one anti-rotation element 24a, and at least a movement coupling unit 26a for a movement of the anti-rotation element 24a in response to a movement of the clamping element 18a and / or the further clamping element 20a.
  • the anti-rotation element 24a is in this case formed separately from the clamping element 18a and separated from the further clamping element 20a.
  • the protective hood unit 14a is in a state arranged on the machine tool 12a by means of an interaction of the clamping element 18a and the further clamping element 20a in a manner already known to a person skilled in the art in at least one position by means of a form-locking and / or non-positive connection to a clamping neck (not shown here in detail) of a tool holder 74a of the machine tool 12a tightened.
  • the machine tool 12a designed as an angle grinder further comprises a handle housing 50a, a drive housing 52a and a driven housing 54a.
  • a handle-shaped handle portion 56a of the handle housing 50a forms a main handle of the machine tool 12a.
  • the main handle extends at least substantially starting from a connection region 58a of the handle housing 50a in a direction away from the connection region 58a direction to a side 60a of the handle housing 50a, on which a cable of the designed as angle grinder machine tool 12a is arranged for power supply.
  • the handle-shaped handle portion 56a of the handle housing 50a is inclined at an angle smaller than 30 ° relative to a main extension direction 62a of the machine tool 12a.
  • the handle housing 50a in addition to the handle-shaped handle portion 56a has a bow-shaped portion 64a, which is integrally formed on the handle-shaped handle portion 56a.
  • the bow-shaped portion 64 a has an L-shaped configuration, which starting from a
  • the connecting portion 58a of the handle housing 50a opposite end of the handle-shaped handle portion 56a extends L-shaped in the direction of the connection region 58a.
  • Extending out of the driven housing 54a is an output shaft 66a, designed as a spindle, of an output unit 68a of the machine tool 12a, to which a machining tool (not shown here) can be fixed to a machining of a workpiece (not shown here).
  • the machining tool can be designed as a grinding wheel, as a cutting wheel or as a polishing pad.
  • the machine tool 12a comprises the drive housing 52a for receiving a drive unit 70a of the machine tool 12a and the output housing 54a for receiving the output unit 68a.
  • the drive unit 70a is provided to rotate the machining tool via the output unit 68a.
  • the machining tool can in this case by means of a fastener (not shown here) for machining a workpiece rotatably connected to the output shaft 66a.
  • the machining tool can be rotationally driven in an operation of the machine tool 12a.
  • the output unit 68a is connected to the drive unit 70a in a manner already known to a person skilled in the art by means of a drive element (not shown here in detail) designed as a pinion and rotationally drivable.
  • an auxiliary handle 72a is arranged on the output housing 54a. The auxiliary handle 72a extends in a state mounted on the output housing 54a transversely to the main extension direction 62a of the machine tool 12a.
  • FIG. 2 shows a detail view of the protective hood unit 14a, on which the guard anti-rotation device 10a is arranged, in a state removed from the machine tool 12a.
  • the protective hood unit 14a has a semicircular protective hood covering area 76a which, in a state fixed to the clamping neck of the machine tool 12a, covers a machining tool coupled to the output shaft 66a along an angular range of approximately 180 °.
  • the protective hood covering region 76a extends in a state of the protective hood unit 14a fixed to the clamping neck of the machine tool 12a in a plane extending at least substantially perpendicular to a rotational axis of the output shaft 66a.
  • the protective hood unit 14a has at least one protective hood side wall 78a which is at least substantially transverse to a main extension surface 80a of the protective hood covering area 76a is arranged and in a state fixed to the clamping neck of the machine tool 12a surrounding a coupled to the output shaft 66a machining tool radially along an angular range of about 180 °. Furthermore, the protective hood unit 14a has a protective collar 118a, which is arranged transversely to the protective hood side wall 78a on a side of the protective hood side wall 78a facing away from the protective hood covering region 76a at least substantially parallel to the protective hood covering region 76a.
  • the protective hood collar 118a viewed in a state of the protective hood unit 14a fixed to the clamping neck of the machine tool 12a, extends radially inwardly in the direction of the output shaft 66a, starting from the protective hood side wall 78a.
  • the guard unit 14a includes a guard neck 82a disposed on the guard cover portion 76a.
  • the guard neck 82a extends at least substantially perpendicular to the main extension surface 80a of the guard cover portion 76a and at least substantially parallel to the guard side wall 78a.
  • the further clamping element 20a is in this case fixed in a form-fitting, force-fitting and / or material-locking manner to the protective hood neck 82a.
  • the further clamping element 20a is designed as a tension band, which is fixed to an outer contour of the protective hood neck 82a.
  • the protective hood unit 14a has an axial securing extension 114a, which is integrally formed on the protective hood neck 82a.
  • the axial securing extension 114a extends in the direction of the output shaft 66a, starting from the guard neck 82a, in a state of the guard unit 14a fixed to the clamping neck of the machine tool 12a.
  • the axial securing extension 114a is intended to cooperate in a state of the protective hood unit 14a fixed to the clamping neck of the machine tool 12a in a manner already known to a person skilled in the art with a corresponding axial securing groove (not shown here in detail) of the clamping neck.
  • the clamping element formed as a further clamping element 20a has an at least substantially annular base region.
  • the base region of the clamping element formed as a further clamping element 20a has a maximum total circumferential extent, which extends in at least one operating state along an angular range which is smaller than 360 °.
  • the total circumferential extent of the base region of the further clamping element 20a extends along a circumferential direction 84a which, in a state of the protective hood unit 14a mounted on the machine tool 12a, is at least substantially perpendicular extends to the axis of rotation of the output shaft 66a extending plane.
  • the further clamping element 20a has a clamping element end 86a which, viewed at least in an operating state, along the circumferential direction 84a, is arranged at a distance from a further clamping element end 88a of the further clamping element 20a.
  • the clamping element end 86a and the further clamping element end 88a extend, starting from the base region of the further clamping element 88a, at least substantially transversely to the circumferential direction 84a.
  • the clamping element end 86a and the further clamping element end 88a are integrally formed integrally with the base region of the further clamping element 20a.
  • the clamping element end 86a and the further clamping element end 88a each have one of at least two receiving recesses 90a, 92a of the further clamping element 20a, in which the clamping element 18a is at least partially arrangeable.
  • the clamping element 18a is in this case designed as a screw which extends in a state arranged on the further clamping element 20a through the receiving recesses 90a, 92a.
  • the tensioning element 18a cooperates with a counter-tensioning element 94a of the tensioning unit 16a that corresponds to the tensioning element 18a.
  • the counter-clamping element 94a is designed as a nut which has a thread corresponding to a thread of the screw element designed as a screw 18a.
  • the counter-clamping element 94a is arranged on the further clamping element end 88a by means of a positive, non-positive and / or material-locking connection on a side of the further clamping element end 88a facing away from the clamping element end 86a.
  • the clamping unit 16a thus comprises at least one screw unit 46a for tightening the protective hood unit 14a.
  • the further clamping element 20a has at least one receiving area 40a in which the anti-rotation locking element 24a is arranged at least partially in an unlocking position of the anti-rotation locking element 24a.
  • the receiving region 40a becomes, in a state of the protective hood unit 14a arranged on the clamping neck of the machine tool 12a, in the plane extending at least substantially perpendicular to the axis of rotation of the output shaft 66a considered formed by a U-shaped portion of the further clamping element 20a.
  • the receiving area 40a is formed by a material recess in the further clamping element 20a.
  • an anti-rotation area 104a of the anti-rotation element 24a is arranged in the unlocking position of the anti-rotation element 24a.
  • the anti-rotation area 104a engages in an anti-rotation position of the anti-rotation element 24a to prevent rotation of the guard unit 14a relative to the clamping neck of the tool holder 74a in a VerFêts Society 104a arranged on the clamping neck of the tool holder 74a Vermosellessausnaturalung (not shown here) of the guard anti-rotation device 10a.
  • the clamping neck of the tool holder 74a here, as already known to the person skilled in the art, has a plurality of distributed anti-rotation recesses of the guard anti-rotation device 10a along the circumferential direction 84a.
  • the anti-rotation recesses may be arranged uniformly or non-uniformly along the circumferential direction 84a on the clamping neck of the tool holder 74a.
  • the guard anti-rotation device 10a comprises for movement of the anti-rotation element 24a to a rotation of the guard unit 14a relative to the machine tool 12a in case of damage of the machining tool during operation of the machine tool 12a, the movement coupling unit 26a.
  • the movement coupling unit 26a comprises at least one energy storage element 28a.
  • the movement coupling unit 26a is provided in at least one operating state to move the anti-rotation element 24a counter to a force of the energy storage element 28a acting on the anti-rotation element 24a at least into the anti-rotation position of the anti-rotation element 24a (FIG. FIG. 4 ).
  • the movement coupling unit 26a is provided in at least one operating state to move the anti-rotation element 24a at least into an anti-rotation position as a function of a change in a distance between a clamping surface 30a of the clamping element 18a and a clamping surface 32a of the further clamping element 20a.
  • the clamping surface 30a of the clamping element 18a faces the clamping surface 32a of the further clamping element 20a.
  • the clamping surface 30a of the clamping element 18a is formed by one of an operating tool side of the screw element designed as a screw 18a opposite side of the clamping element 18a formed.
  • the clamping surface 32a of the further clamping element 20a is formed by a side of the clamping element end 86a, which faces the clamping element 18a designed as a screw.
  • the anti-rotation element 24a is at least partially against the clamping surface 30a of the clamping element 18a.
  • a support region 96a of the anti-rotation element 24a abuts at least substantially completely on the clamping surface 30a of the clamping element 18a (not shown here in detail).
  • a recess is introduced, through which the clamping element 18a designed as a screw extends at least partially therethrough.
  • the energy storage element 28a is fixed to the support region 96a of the anti-rotation element 24a.
  • the energy storage element 28a is supported with one end 34a on the anti-rotation element 24a and with a further end 36a, the energy storage element 28a is supported on the further clamping element 20a.
  • the energy storage element 28a is arranged spatially between the clamping surface 30a of the clamping element 18a and the clamping surface 32a of the further clamping element 20a.
  • the energy storage element 28a viewed along a clamping direction 120a of the clamping element 18a and the further clamping element 20a, fixed on one of the clamping surface 30a of the clamping element 18a side facing away from the support portion 96a of the anti-rotation element 24a and the clamping surface 32a of the further clamping element 20a.
  • the energy storage element 28a is designed as a spring element 38a.
  • the energy storage element 28a is formed as a spring plate, which has a substantially V-shaped configuration in at least one unloaded state.
  • the energy storage element 28a at least two legs 98a, 100a, which are connected to each other via an arcuate portion 102a of the energy storage element 28a ( FIG. 3 ).
  • the legs 98a, 100a and the arcuate portion 102a of the energy storage element 28a are formed integrally with each other.
  • One of the legs 98a, 100a is fixed to the support region 96a of the rotation-preventing element 24a, and one of the legs 98a, 100a is fixed to the clamping surface 32a of the further clamping element 20a ( FIG. 3 ).
  • the anti-rotation element 24a is pivotally mounted at least relative to the clamping element 18a and / or relative to the further clamping element 20a.
  • the anti-rotation element 24a by means of the energy storage element 28a is relative to the clamping element 18a and / or pivotally mounted relative to the further clamping element 20a.
  • a pivot axis of the anti-rotation element 24a is formed by the arcuate portion 102a of the energy storage element 28a.
  • the anti-rotation element 24a is mounted pivotably relative to the clamping element 18a and / or relative to the further clamping element 20a by means of a hinge unit.
  • the joint unit may comprise, for example, a bearing pin, which is arranged on the further tensioning element 20a and is received in a bearing lug of the joint unit disposed on the anti-rotation element 24a.
  • the anti-rotation element 24a has at least one axial securing region 42a, which is provided in at least one operating state to at least largely prevent an axial movement of the anti-rotation element 24a running at right angles to an anti-rotation movement direction 44a of the anti-rotation element 24a (FIG. FIG. 6 ).
  • the axial securing region 42a runs at least substantially transversely to the supporting region 96a of the anti-rotation locking element 24a.
  • the anti-rotation locking element 24a is moved starting from the unlocking position of the anti-rotation element 24a along the direction of anti-rotation movement direction 44a of the anti-rotation element 24a in the anti-rotation position of the anti-rotation element 24a.
  • the axial securing region 42a viewed in a state of the protective hood unit 14a arranged on the clamping neck of the tool holder 74a, extends at least substantially parallel to the plane extending at least substantially perpendicular to the axis of rotation of the output shaft 66a. Furthermore, the axial securing region 42a extends at least substantially parallel to the protective cover area 76a of the protective hood unit 14a.
  • the axial securing portion 42a is designed to be supported on a prevention of axial movement of the anti-rotation member 24a in at least one operating condition on the protective cover portion 76a of the guard unit 14a.
  • the guard neck 82a is pushed over the clamping neck of the tool holder 74a. Subsequently, by tightening the clamping element designed as a screw 18a and by cooperating with the tensioning band designed as another clamping element 20a, a tightening of the protective hood neck 82a and thus the protective hood unit 14a reaches the clamping neck of the tool holder 74a in a manner already known to a person skilled in the art. During the tightening, the energy storage element 28a arranged spatially between the clamping surface 30a of the clamping element 18a and the clamping surface 32a of the further clamping element 20a is compressed.
  • the rotation-preventing element 24a is moved relative to the clamping element 18a and relative to the further clamping element 20a in the direction of the clamping neck of the tool holder 74a due to the design of the energy storage element 28a and due to the fixation of the energy storage element 28a.
  • the rotation-preventing region 104a of the rotation-preventing element 24a is thus removed from the receiving region 40a of the further clamping element 20a (FIG. FIG. 4 ) in one of the VerFDellessaus founded here) of the clamping neck of the tool holder 74 a pivoted.
  • the anti-rotation element 24a is moved along the clamping direction 120a of the clamping element 18a and the further clamping element 20a as a result of further tightening of the clamping element 18a designed as a screw.
  • the anti-rotation portion 104a is moved along a protective cover diameter of the protective hood neck 82a.
  • a radial locking of the anti-rotation element 24a is achieved which largely prevents a radial movement of the anti-rotation element 24a in a locked anti-rotation position of the anti-rotation element 24a ( FIG. 5 ).
  • FIGS. 7 to 11 Alternative embodiments are shown. Substantially identical components, features and functions are basically numbered by the same reference numerals. To distinguish the embodiments, the letters a to e are added to the reference numerals of the embodiments. The following description is limited essentially to the differences from the first embodiment in the FIGS. 1 to 6 , wherein with respect to the same components, features and functions on the description of the first embodiment in the FIGS. 1 to 5 can be referenced.
  • FIG. 7 shows an alternative guard anti-rotation device 10b designed as an angle grinder machine tool (not shown here).
  • the guard anti-rotation device 10b comprises at least one clamping unit 16b provided for clamping a guard unit 14b (shown only partially here), comprising at least one clamping element 18b and a further clamping element 20b cooperating at least with the clamping element 18b, at least one anti-rotation locking element 22b, which comprises at least one anti-rotation element 24b and at least one movement coupling unit 26b for a movement of the anti-rotation element 24b in response to a movement of the clamping element 18b and / or the further clamping element 20b.
  • the movement coupling unit 26b comprises at least one energy storage element 28b.
  • the energy storage element 28b is designed as a spring element 38b.
  • the spring element 38b is designed as a leg spring.
  • the spring element 38b designed as a leg spring comprises two legs 98b, 100b. One of the legs 98b, 100b is fixed to a support portion 96b of the anti-rotation member 24b, and one of the legs 98b, 100b is fixed to a chuck member end 86b of the further chuck member 20b.
  • the spring element 38b designed as a leg spring to be arranged on a bearing pin which is integrally formed on the further tensioning element 20b and which, for example, forms a pivot axis of the anti-rotation locking element 24b.
  • FIG. 8 shows an alternative arrangement of an energy storage element 28b 'of the guard anti-rotation device 10b to a in FIG. 7 illustrated arrangement of the energy storage element 28b of the guard anti-rotation device 10b.
  • the energy storage element 28b ' is in this case formed as a spring element 38b', which is formed by a leg spring.
  • a central axis of the energy storage element 28b ' extends at least substantially parallel to a longitudinal direction of the clamping element 18b.
  • the spring element 38b ' is arranged on a thread of the clamping element designed as a screw 18b.
  • the spring element 38b ' viewed along the longitudinal direction of the clamping element 18b, spatially between a clamping element end 86b and another clamping element end 88b of the further clamping element 20b.
  • the spring element 38b 'designed as a leg spring has two legs 98b', 100b '. One of the legs 98b ', 100b' is supported on an outer diameter of a protective hood neck 82b of the protective hood unit 14b and one of the legs 98b ', 100b' is supported on the anti-rotation element 24b.
  • FIG. 9 shows an alternative guard anti-rotation device 10c designed as an angle grinder machine tool (not shown here).
  • the guard anti-rotation device 10c comprises at least one clamping unit 16c provided for clamping a protective guard unit 14c (shown only partially here), comprising at least one clamping element 18c and a further clamping element 20c cooperating at least with the clamping element 18c, at least one anti-rotation unit 22c, which comprises at least one anti-rotation element 24c and at least one movement coupling unit 26c for a movement of the anti-rotation element 24c in response to a movement of the clamping element 18c and / or the further clamping element 20c.
  • the movement coupling unit 26c comprises at least one energy storage element 28c.
  • the energy storage element 28c is designed as a spring element 38c.
  • the spring element 38c is designed as a compression spring.
  • the compression spring is designed as a helical spring.
  • the spring element 38c embodied as a compression spring is supported on a further clamping element end 88c of the further clamping element 20c and on a supporting region 96c of the anti-rotation locking element 24c.
  • the anti-rotation element 24c is pivotally mounted relative to the clamping element 18c and / or to the further clamping element 20c by means of a hinge unit 106c of the rotation-preventing unit 22c.
  • the joint unit 106c comprises a bearing lug 108c formed integrally with the further tensioning element 20c, in which engages a bearing pin 110c of the joint unit 106c formed integrally with the support region 96c.
  • the bearing pin 110c is formed by a member formed separately from the support portion 96c and / or that the bearing tab 108c is formed integrally with the support portion 96c in which the bearing pin 110c engages.
  • FIG. 10 shows an alternative guard anti-rotation device 10d designed as an angle grinder machine tool (not shown here).
  • the guard anti-rotation device 10d comprises at least one clamping unit 16d provided for clamping a guard unit 14d (here only partially illustrated) comprising at least one clamping element 18d and a further clamping element 20d cooperating at least with the clamping element 18d, at least one anti-rotation unit 22d comprising at least one anti-rotation element 24d and at least one movement coupling unit 26d for a movement of the anti-rotation element 24d in response to a movement of the clamping element 18d and / or the further clamping element 20d.
  • the movement coupling unit 26d comprises at least one energy storage element 28d.
  • the energy storage element 28d is formed by a gas or oil pressure spring.
  • the energy storage element 28d is supported on a further clamping element end 88d of the further clamping element 20d and on a supporting region 96d of the anti-rotation element 24d.
  • the anti-rotation element 24d is pivotally mounted relative to the clamping element 18d and / or pivotable to the further clamping element 20d by means of a hinge unit 106d of the rotation-preventing unit 22d.
  • the joint unit 106d comprises a bearing lug 108d which is formed integrally with the further tensioning element 20d and into which engages a bearing pin 110d of the joint unit 106d formed integrally with the support region 96d.
  • bearing pin 110d may be formed by a member formed separately from the support region 96d and / or for the bearing lug 108d to be formed integrally with the support region 96d into which the bearing pin 110d engages.
  • FIG. 11 shows an alternative guard anti-rotation device 11 e designed as an angle grinder machine tool (not shown here).
  • the guard anti-rotation device 11 e comprises at least one clamping unit 16e provided for clamping a protective hood unit 14e, comprising at least one clamping element 18e and a further clamping element 20e cooperating at least with the clamping element 18e, at least one anti-rotation unit 22e having at least one anti-rotation element 24e, and at least one Motion coupling unit 26e to a movement of the anti-rotation element 24e in response to movement of the clamping element 18e and / or the further clamping element 20e.
  • the motion coupling unit 26e comprises at least one energy storage element 28e.
  • the clamping unit 16e comprises at least one lever unit 48e for clamping the protective hood unit 14e.
  • the clamping element 18e is designed as a clamping bracket. Trained as a clamping bracket clamping element 18e is arranged with one end eccentric to a bearing axis of a clamping lever element 112e of the lever unit 48e on the clamping lever element 112e. With another end, the clamping element 18e is arranged in a receiving lug 114e of the anti-rotation element 24e.

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)

Claims (9)

  1. Dispositif de fixation contre la rotation d'un capot de protection pour une machine-outil, en particulier pour une meuleuse d'angle, comprenant au moins une unité de serrage (16a ; 16b ; 16c ; 16d ; 16e) prévue pour serrer fixement une unité de capot de protection (14a ; 14b ; 14c ; 14d ; 14e), qui comprend au moins un élément de serrage (18a ; 18b ; 18c ; 18d ; 18e) et un élément de serrage supplémentaire (20a ; 20b ; 20c ; 20d ; 20e) coopérant avec l'élément de serrage (18a ; 18b ; 18c ; 18d ; 18e), avec au moins une unité de fixation contre la rotation (22a ; 22b ; 22c ; 22d ; 22e) qui empêche essentiellement une rotation de l'unité de capot de protection (14a ; 14b ; 14c ; 14d ; 14e) dans un état monté par rapport à un col de serrage de la machine-outil en cas d'endommagement d'un outil d'usinage disposé au niveau d'un logement d'outil (74a) de la machine-outil au moyen d'une connexion par engagement par correspondance de formes et/ou par force et qui présente au moins un élément de fixation contre la rotation (24a ; 24b ; 24c ; 24d ; 24e), et comprenant au moins une unité d'accouplement de mouvement (26a ; 26b ; 26c ; 26d ; 26e) à un mouvement de l'élément de fixation contre la rotation (24a ; 24b ; 24c ; 24d ; 24e), en fonction d'un mouvement de l'élément de serrage (18a ; 18b ; 18c ; 18d ; 18e) et/ou de l'élément de serrage supplémentaire (20a ; 20b ; 20c ; 20d ; 20e), caractérisé en ce que l'unité d'accouplement de mouvement (26a ; 26b ; 26c ; 26d ; 26e) comprend au moins un élément accumulateur d'énergie (28a ; 28b ; 28c ; 28d ; 28e) qui est prévu pour accumuler de l'énergie potentielle suite à un mouvement d'un élément supplémentaire à l'encontre d'une force et pour fournir cette énergie dans au moins un état de fonctionnement sous forme d'énergie cinétique à l'élément de fixation contre la rotation (24a ; 24b ; 24c ; 24d ; 24e), l'élément accumulateur d'énergie (28a ; 28b ; 28c ; 28d ; 28e) s'appuyant par une extrémité (34a ; 34b ; 34c ; 34d ; 34e) contre l'élément de fixation contre la rotation (24a ; 24b ; 24c ; 24d ; 24e) et s'appuyant par une autre extrémité (36a ; 36b ; 36c ; 36d ; 36e) contre l'élément de serrage supplémentaire (20a ; 20b ; 20c ; 20d ; 20e).
  2. Dispositif de fixation contre la rotation d'un capot de protection selon la revendication 1, caractérisé en ce que l'unité d'accouplement de mouvement (2 6a ; 2 6b ; 2 6c ; 2 6d ; 26e), dans au moins un état de fonctionnement, est prévue pour déplacer dans au moins une position de blocage de fixation contre la rotation l'élément de fixation contre la rotation (24a ; 24b ; 24c ; 24d ; 24e) en fonction d'une variation d'une distance entre une surface de serrage (30a ; 30b ; 30c ; 30d ; 30e) de l'élément de serrage (18a ; 18b ; 18c ; 18d ; 18e) et une surface de serrage (32a ; 32b ; 32c ; 32d ; 32e) de l'élément de serrage supplémentaire (20a ; 20b ; 20c ; 20d ; 20e).
  3. Dispositif de fixation contre la rotation d'un capot de protection selon l'une quelconque des revendications précédentes, caractérisé en ce que l'élément de fixation contre la rotation (24a ; 24b ; 24c ; 24d ; 24e) est supporté de manière pivotante au moins par rapport à l'élément de serrage (18a ; 18b ; 18c ; 18d ; 18e) et/ou par rapport à l'élément de serrage supplémentaire (20a ; 20b ; 20c ; 20d ; 20e).
  4. Dispositif de fixation contre la rotation d'un capot de protection selon l'une quelconque des revendications précédentes, caractérisé en ce que l'élément accumulateur d'énergie (28a ; 28b ; 28c ; 28e) est réalisé sous forme d'élément à ressort (38a ; 38b ; 38c ; 38e).
  5. Dispositif de fixation contre la rotation d'un capot de protection selon l'une quelconque des revendications précédentes, caractérisé en ce que l'élément de serrage supplémentaire (20a ; 20b ; 20c ; 20d ; 20e) présente au moins une région de réception (40a ; 40b ; 40c ; 40d ; 40e) dans laquelle l'élément de fixation contre la rotation (24a ; 24b ; 24c ; 24d ; 24e) est disposé au moins en partie dans une position de déverrouillage de l'élément de fixation contre la rotation (24a ; 24b ; 24c ; 24d ; 24e).
  6. Dispositif de fixation contre la rotation d'un capot de protection selon l'une quelconque des revendications précédentes, caractérisé en ce que l'élément de fixation contre la rotation (24a ; 24b ; 24c ; 24d ; 24e) présente au moins une région de fixation axiale (42a ; 42b ; 42c ; 42d ; 42e) qui est prévue dans au moins un état de fonctionnement pour empêcher au moins sensiblement un mouvement axial de l'élément de fixation contre la rotation (24a ; 24b ; 24c ; 24d ; 24e) s'étendant au moins sensiblement transversalement à une direction de mouvement de fixation contre la rotation (44a ; 44b ; 44c ; 44d ; 44e) de l'élément de fixation contre la rotation (24a ; 24b ; 24c ; 24d ; 24e).
  7. Dispositif de fixation contre la rotation d'un capot de protection selon l'une quelconque des revendications précédentes, caractérisé en ce que l'unité de serrage (16a ; 16b ; 16c ; 16d) comprend au moins une unité de vissage (46a ; 46b ; 46c ; 46d) pour serrer fixement l'unité de capot de protection (14a ; 14b ; 14c ; 14d).
  8. Dispositif de fixation contre la rotation d'un capot de protection selon l'une quelconque des revendications 1 à 6, caractérisé en ce que l'unité de serrage (16e) comprend au moins une unité de levier (48e) pour serrer fixement l'unité de capot de protection (14e).
  9. Système de machine-outil comprenant au moins un dispositif de fixation contre la rotation d'un capot de protection selon l'une quelconque des revendications précédentes, comprenant au moins une machine-outil, en particulier une meuleuse d'angle, et comprenant au moins une unité de capot de protection (14a ; 14b ; 14c ; 14d ; 14e).
EP12191781.9A 2011-12-23 2012-11-08 Dispositif de blocage de tournevis de protection Not-in-force EP2607014B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201110089754 DE102011089754A1 (de) 2011-12-23 2011-12-23 Schutzhaubenverdrehsicherungsvorrichtung

Publications (3)

Publication Number Publication Date
EP2607014A2 EP2607014A2 (fr) 2013-06-26
EP2607014A3 EP2607014A3 (fr) 2014-10-01
EP2607014B1 true EP2607014B1 (fr) 2017-03-01

Family

ID=47227511

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12191781.9A Not-in-force EP2607014B1 (fr) 2011-12-23 2012-11-08 Dispositif de blocage de tournevis de protection

Country Status (3)

Country Link
EP (1) EP2607014B1 (fr)
CN (1) CN103170911B (fr)
DE (1) DE102011089754A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012214834A1 (de) * 2012-08-21 2014-02-27 Robert Bosch Gmbh Schutzhaubenvorrichtung
CN107553416B (zh) * 2017-10-25 2024-03-15 锐奇控股股份有限公司 电动工具防护罩调节装置及电动工具

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002070201A1 (fr) * 2001-03-07 2002-09-12 Sparky Eltos Carter de protection pour meuleuses d'angle
DE10124439A1 (de) * 2001-05-18 2002-11-21 Bosch Gmbh Robert Handgeführtes Elektrowerkzeug mit Schutzhaube
DE102006053303A1 (de) * 2006-11-13 2008-05-15 Robert Bosch Gmbh Handwerkzeugmaschine für ein rotierendes Werkzeug mit Schutzhaube
DE102006053305A1 (de) 2006-11-13 2008-05-15 Robert Bosch Gmbh Handwerkzeugmaschine mit Schutzhaube, insbesondere Winkelschleifer
DE102008002451A1 (de) * 2008-06-16 2009-12-17 Robert Bosch Gmbh Werkzeugmaschine, insbesondere Handwerkzeugmaschine

Non-Patent Citations (1)

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Title
None *

Also Published As

Publication number Publication date
CN103170911A (zh) 2013-06-26
EP2607014A3 (fr) 2014-10-01
DE102011089754A1 (de) 2013-06-27
EP2607014A2 (fr) 2013-06-26
CN103170911B (zh) 2017-08-11

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