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
• • 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

Definitions

• the invention relates to a protective device according to the preamble of claim 1.
• the invention relates to a protective device for a hand tool for a rotating, preferably disc-shaped tool, in particular for an angle grinder, with at least one main body unit.
• the basic body unit has an absorption element provided for deformation.
• a “basic body unit” is to be understood here as meaning, in particular, a unit which has at least one base body means, such as a base body, a base body wall, a base body collar, a base body neck and / or a base body element.
• an “absorption element” is understood to mean in particular an element which has a special deformation intended for deformation and / or can be deformed particularly well due to its material and / or construction properties and / or energy, in particular kinetic energy, such as rotational energy, translational ons energie, heat, etc., of parts that come into contact with the absorption element record.
• the absorption element can absorb energy by elastic and / or plastic deformability.
• the embodiment according to the invention advantageously avoids a risk of injury to an operator of the handheld power tool.
• the main body unit is preferably arranged around a disc-shaped and rotating tool of a hand tool, such as an angle grinder, so that by the absorption element in 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 tool, such as a grinding wheel, a cutting disc, etc., can be absorbed advantageously.
• the absorption element has a profiling for receiving kinetic energy.
• a profiling for receiving kinetic energy.
• a shaping design such as a slot, a perforation, a wave or a sawtooth profile, a concentric profile, a variation of the wall thickness, a multi-walled and / or another, the
• the profiling is at least one recess arranged in at least one subregion of at least one main body by means of the main body unit.
• a "recess” is understood to mean, in particular, an opening extending through an entire extension, preferably a thickness, of an object, such as a hole and /
• a basic body means represents the main body wall, the main body waistband, the main body neck, and particularly preferably the main body.
• a targeted deformation of the protective device can be achieved at a point at which the energy absorption occurs the formation of an energy maximum by, for example, the impact of a fragment of a tool destroyed during operation of the handheld power tool is required to a maximum extent, a particularly homogeneous deformation and thus an efficient energy absorption tion can be achieved if the profiling and / or the recess in two and preferably in three basic body means, such as the base body, the base body wall and / or the body trunk, is arranged. It can also be provided more than one recess extending in the circumferential direction over the Grand body means extend. Furthermore, the recesses may differ in their shapes.
• the recess represents a longitudinal opening which is arranged along a direction of the basic body unit pointing essentially radially outward.
• a “longitudinal opening” is to be understood here as meaning, in particular, an opening, in particular a slot, which has a longitudinal extent of at least twice as long, preferably 10 times as long and particularly advantageously 30 times as long as its extent
• the term "radially outward-pointing direction” should be understood to mean, in particular, a direction that runs along a line extending from an imaginary center point of the imaginary center Grandkesselhalses extends to a circle circumference of the Grand stresses.
• the longitudinal opening can be arranged at an angle of up to 10 ° in an intersection between the longitudinal opening and the line deviating from the line Lengths may have and these differently long longitudinal openings may be arranged alternately to each other and / or in groups, preferably in the circumferential direction.
• the grand-body unit comprises at least two partial areas which have specifically different absorption properties.
• the protective device can be structurally designed simply for different load situations. If, for example, a first partial region is arranged in an edge and / or edge region of the protective device and if it is designed with the higher absorption characteristic or with a slight deformability than a second partial region which is located in a position facing away from the edge, the protective device can be targeted a most likely impact location of a fallow piece of the bursting tool.
• the grand-body unit has at least two walls with different wall thicknesses.
• a first wall here preferably represents a wall of the grand body wall and a second wall preferably represents a wall of the grand body and / or the Grand stresses.
• a second wall preferably represents a wall of the grand body and / or the Grand stresses.
• different absorption properties can be realized structurally simple and component-saving.
• at least one radial wall of the basic body unit is provided which at least partially forms the absorption element.
• the term "radial wall” should be understood to mean that part of the basic body unit which is arranged radially and extends at least along a partial area of the circumference of the tool
• the radial wall or the base body wall can be realized in an unchanged basic form.A stable and at the same time secure protection device can be provided.
• the absorption element has at least one partial area with a sawtooth and / or a wave profile.
• the sawtooth and / or the Wellenproeuropa is particularly advantageously arranged in the base body wall and extends in the circumferential direction along the main body wall.
• the profile can be embossed and / or punched executed.
• it can advantageously be achieved that a contact time and / or a contact distance that the tool fragment has with the protective device in the event of a bursting and a forcefully moving out of the protective device decreases. Due to the repeated impact, the residual energy that is released to the attachment of the protection device on the machine tools, is reduced.
• a comminution and / or a crumbling of the fragment can take place by a wandering through the profile or a repeated impact of the fragment on the absorption element, in particular in the circumferential direction one behind the other and pointing in the direction of the tool troughs.
• the base body means preferably represents the base body wall.
• the different wall thicknesses here preferably define elements or subregions of the sawtooth and / or wave profile.
• the profile has different partial regions, such as a thick flank facing a direction of rotation of the tool, and / or a thin flank or lamella extending in the radial direction of the main body and / or pointing in the direction of rotation of the tool Punch opening, which differ in their absorption properties.
• the inventive design can be ensured that the absorption element or a related profile weakness is located on a trajectory of a tool fragment and that little Motion energy of the impacting on the absorption element tool fragment is converted into an unwanted and dangerous movement of the protective device and / or the basic body unit.
• the absorption element has an at least substantially concentric profile.
• a “concentric profile” is to be understood here as meaning, in particular, a shape which extends at least partially in the circumferential direction around a center, such as the main body neck, in which case the profile is preferably arranged in the base body - Derelement are integrated into the protection device, which absorbs energy in strikes of fragments in a main body wall inner wall.
• the absorption element is designed multi-walled, which structurally simply more wall material is present, which can be deformed and thus absorbs more energy.
• multi-walled should be understood to mean, in particular, a design with more than one wall
• a filling component is introduced between an inner wall and an outer wall of the absorption element.
• a “filling component” is to be understood here as meaning, in particular, a component of an energy-absorbing material, such as a foam and / or an elastomer,
• foam has a sound-absorbing effect, whereby additionally advantageous noises of the power tool can be reduced.
• the protective device has a multi-part main body neck, whereby structurally simple an absorption element can be installed in the main body neck.
• At least one rubber-elastic component is provided, which is arranged on the main body neck.
• the term "rubber-elastic component” is to be understood here in particular as a component which absorbs energy under a reversible deformation. biert and free again, the deformation is preferably greater than 2% of a component thickness.
• the rubber-elastic component may be cohesively arranged on the main body neck.
• FIG. 1 shows a hand tool with a protection device according to the invention in a schematic representation
• FIG. 2 shows the protective device of FIG. 1 in a perspective view from above
• FIG. 3 shows an alternative protective device with a tapered absorption element profile in a perspective view from above
• FIG. 4 shows a further alternative protective device with one arranged in a base body wall Absorption element in a perspective view from above
• Fig. 5 is a parallel to a main body extending section through a
• Fig. 6 is a parallel to a main body extending section through a
• FIG. 7 is a parallel to a main body extending section through a
• FIG. 8 shows a further alternative protection device with an absorption element arranged in a basic body in a perspective view from above
• FIG. 9 shows a further alternative protection device with a basic body wall constructed in a double-walled construction in a perspective view from above
• FIG. 10 a further alternative protection device with a multipart base body neck and an absorption element arranged thereon in a perspective view from above and FIG
• Fig. 11 is a parallel to a main body extending section through a
• FIG. 1 shows a hand-held power tool 12a formed by an angle grinder in a view from above.
• the angle grinder comprises a housing 60a and a main handle 62a integrated in the housing 60a.
• a tool 14a which is formed by a cutting disc, facing portion 64a of the angle grinder, a tool holder 66a is arranged on which a protective device 10a, namely a protective hood with a main body unit 16a is arranged.
• the basic body unit 16a serves to protect an operator of the handheld power tool 12a from sparks and material particles and to protect against fragments of the tool 14a, which may result from damage such as bursting of the tool 14a during operation of the handheld power tool 12a.
• the protective device 10a or the basic body unit 16a is composed of a plurality of base body means 24a and comprises a half-disc-shaped base body 68a and a base body wall 70a, which is arranged transversely to a main extension surface 72a of the base body 68a and radially surrounds a tool 14a.
• the main body wall 70a is arranged on a side 74a facing the tool 14a.
• the basic body unit 16a has a main body collar 76a which is arranged transversely to an extension surface 78a of the main body wall 70a on a side 80a of the main body wall 70a facing away from the main body 68a, parallel to the main body 68a and extends radially inwardly from the main body wall 70a. Furthermore, a main body neck 56a is arranged on the main body 68a, which extends transversely to a main extension surface 72a of the main body 68a and is aligned parallel to the main body wall 70a. In this case, the main body neck 56a is arranged on a side 82a facing away from the tool 14a.
• the semicircular base body unit 16a has an absorption element 18a provided for deformation, which is arranged in a base body means 24a configured as the base body 68a. Further, the steel main body unit 16a covers an angular range of 180 ° of the tool 14a (FIG. 1). In principle, however, other materials that appear appropriate to the person skilled in the art and that have sufficient strength and hardness, such as, for example, a carbon fiber construction, are also conceivable for forming the basic body unit 16a.
• the absorption element 18a has a profiling 20a for receiving kinetic energy.
• the profiling 20a represents a recess 26a in the form of a longitudinal opening 28a, which is arranged along a direction 30a of the basic body unit 16a that points essentially radially outwards.
• the recess 26a or the longitudinal opening 28a is arranged in a partial region 22a of the main body means 24a or of the main body 68a of the main body unit 16a, which extends from an edge 84a which extends in the radial direction of the main body 68a along a circumferential direction 86a to approximately one Third extends over the main extension surface 72a of the body 68a.
• the partial region 22a has further longitudinal openings 28a, which extend in the circumferential direction 86a one behind the other over the main body 68a.
• the longitudinal openings 28a are arranged radially around a center, such as the main body neck 56a.
• the longitudinal openings 28a extend radially outwardly from an imaginary center 88a of the main body neck 56a to different points 90a of the pitch circle circumference 92a of the main body 68a, the points 90a being arranged one after another in the circumferential direction 86a.
• the recesses 26a and the longitudinal openings 28a differ with respect to their shapes and / or their length.
• a longitudinal opening 94a which is arranged in a region of the partial region 22a pointing to the edge 84a, is approximately half as long as a longitudinal opening 96a, which is placed in the circumferential direction 86a immediately after the longitudinal opening 94a.
• Longitudinal openings 94a and longitudinal openings 96a are alternately to one another in the circumferential direction 86a. orderly.
• the longitudinal opening 94a has an approximately 30 times as long longitudinal extent 98a opposite to an extension in its width 100a.
• FIGS. 3 to 11 show alternative embodiments of the protective device 10a. Essentially, the same components, features and functions are always numbered the same. To distinguish the embodiments, however, the reference numerals of the embodiments, the letters a and k are added. The following description is essentially limited to the differences from the exemplary embodiment in FIG. 2, reference being made to the description of the exemplary embodiment in FIG. 2 with regard to components, features and functions remaining the same.
• FIG. 3 shows an alternative protective device 10b with a main body unit 16b, which has a main body 68b, a main body wall 70b, a main body collar 76b and a main body neck 56b.
• the semicircular base body unit 16b has an absorption element 18b provided for deformation, which is arranged in the base body 68b.
• the absorption element 18b has a profiling 20b in the form of a recess 26b or a longitudinal opening 28b, which is arranged along a direction 30b of the main body unit 16b pointing essentially radially outward. Further longitudinal openings 28b are arranged in a partial region 22b, which extend in a circumferential direction 86b behind one another over the main body 68b.
• the longitudinal openings 28b are arranged radially around a center, such as the main body neck 56b.
• the partial area 22b of the main body unit 16b comprises two partial areas 32b and 34b which have specifically different absorption properties.
• the partial region 32b is arranged in a region of the partial region 22b facing the edge 84a and the partial region 34b in a region facing away from the edge 84b or in a region which is located substantially centrally between the edge 84b and a second radially extending edge 102b ,
• a longitudinal opening 94b which is arranged in the partial area 32b, has a longer longitudinal extent 98b than a longitudinal opening 104b arranged in the partial area 34b.
• the absorption element 18b is arranged in two grand body means 24b, namely the grand body 68b and the grand body wall 70b designed as a radial wall 40b, or the longitudinal openings 28b extend over a plurality of grand body means 24b.
• the absorption element 18b is arranged in two grand body means 24b, namely the grand body 68b and the grand body wall 70b designed as a radial wall 40b, or the longitudinal openings 28b extend over a plurality of grand body means 24b.
• FIG 4 shows an alternative protection device 10c with a Grand Economics ancient 16c, the one
• Grand body 68c a Grand restructuringwand 70c, a Grandeniabund 76c and a main body neck 56c has.
• the semicircular Grandisson 16c two walls 36c, 38c with different wall thicknesses, wherein one of the walls 36c, 38c is a radial wall 40c.
• the radial wall 40c is designed as a grand body wall 70c and forms the absorption element 18c provided for deformation.
• Absorbent element 18c has a thickness 110c that is thinner than a thickness 112c of wall 38c that is a wall of the main body 68c and / or the body trim 76c.
• FIG. 5 shows an alternative protective device 10d in a plan view of a section running parallel to a grand body, not shown here, through a main body wall 7Od of FIG
• an absorption element 18d which has a partial region 42d with a sawtooth profile 44d, is arranged in the grand body wall 7Od, which constitutes a radial wall 4Od.
• the sawtooth profile 44d extends in the circumferential direction 86d along an outer side 114d of the Granddoubtedlywand 7Od, which is arranged on a side facing away from a tool not shown here side of the Grandeniawand 7Od and the Grandeniabunds 76d and it extends along an inner side 116d, the at a tool facing side is arranged.
• flank region 118d has a thickness 122d formed by a wall thickness which is thicker than a thickness 124d of the flank region
• flank region 118d A major extension of the flank region 118d extends substantially along the circumferential direction 86d and extends in a rotational direction of the tool, not shown here, which runs parallel to the circumferential direction 86d.
• flank region 12Od extends substantially in the radial direction 30d. Due to this flank orientation, the seed tooth profile 44d oriented counter to a rotational direction of the tool, which is structurally simple prevents sparks resulting from the impact of fragments and / or the fragments themselves can leave the protective device.
• the sawtooth profile 44d is introduced by embossing into the outside 114d and the inside 116d of the main body wall, but it is also conceivable for another introduction that appears appropriate to the person skilled in the art.
• FIG. 6 shows an alternative protection device 10e in a plan view of a section running parallel to a base body, not shown here, through a base body wall 7Oe of a basic body unit 16e.
• the main body wall 7Oe which represents a radial wall 4Oe
• an absorption element 18e which has a partial region 42e with a sawtooth profile 44e
• the sawtooth profile 44e extends in the circumferential direction 86e along an outer side 114e and along an inner side 116e of the main body wall 7Oe and is introduced by means of a punching process into the outer side 114e of the main body wall.
• An arrangement of alternately arranged flank regions 118e, 12Oe in the sawtooth profile 44e has the basic body wall 7Oe with different wall thicknesses.
• the flank region 118e constitutes a lamella
• the blade 126e which is flanked in the circumferential direction 86e by two flank regions 12Oe in the form of two punched openings 128e.
• the blade 126e extends substantially along the circumferential direction 86e and extends in a rotational direction of the tool.
• the punch opening 128e spaces two lamellae in the radial direction 30e, with the louvers 126e abutting one another at their end regions.
• it would also be conceivable to enlarge the punched openings by turning the slats 126e in their respective axis of rotation 130e, so that air can be sucked from outside into the protective device 10e by rotation of the tool, not shown, which cools sparks in the protective device 10e and thus reducing a spark.
• FIG. 7 shows an alternative protection device 1 Of in a plan view of a section running parallel to a base body, not shown here, through a base body wall 7Of of a basic body unit 16f.
• the main body wall 7Of which constitutes a radial wall 4Of
• an absorption element 18f which has a partial region 42f with a corrugated profile 46f
• the corrugation profile 46f extends in the circumferential direction 86f along an outer side 114f and along an inner side 116f of the main body wall 7Of.
• the main body wall 7Of has different wall thicknesses.
• the flank region 118f has a thickness 122f that is thicker than a thickness 124f of the flank region 12Of.
• the major extensions of the flank regions 118f, 12Of extend substantially along the circumferential direction 86f and extend in a rotational direction. direction of the tool, not shown here.
• the flank region 118f points from a wave crest 132f to a wave trough 134f previously arranged in the circumferential direction 86f, and the flank region 12Of points from a wave trough 134f to a wave crest 132f following in the circumferential direction 86f.
• the wall thickness of the entire wave profile 46f can also be of the same thickness.
• FIG. 8 shows an alternative protective device 10g with a basic body unit 16g, which has a main body 68g, a main body wall 70g, a main body collar 76g and a main body neck 56g.
• the semicircular base body unit 16g has an absorption element 18g provided for deformation, which is arranged in the base body 68g and a concentric profile 48g, which extends in the circumferential direction 86g around the main body neck 56g.
• the concentric profile 48g represents an additional damping or spring element and is composed of three wave crests 136g and valleys 138g, which are arranged one after the other in the radial direction 30g from the main body neck 56g to the circular circle circumference 92g.
• FIG. 9 shows an alternative protection device 10h with a basic body unit 16h, which has a main body 68h, a main body wall 70h, a main body collar 76h and a main body neck 56h.
• the main body wall 70h and / or the main body collar 76h constitutes part of an absorption element 18h, which has a multi-walled construction.
• the main body wall 70h forms an outer wall 52h of the absorption element 18h, which is arranged substantially parallel to an inner wall 50h of the absorption element 18h.
• the inner wall 50h is arranged transversely to a main extension surface 72h of the main body 68a and constitutes a wall extending in the peripheral direction 86h around a part of a tool not shown here and facing the same.
• a thickness 140h of the inner wall 50h is thinner than a thickness 142h of FIG.
• the inner wall 50h and the outer wall 52h include in the radial direction 30h a cavity 144h in which a filling component 54h in the form of a foam is introduced.
• a foam defines a solid containing gaseous inclusions, such as gaseous bubbles in particular.
• an embodiment without filling component would also be conceivable.
• FIG. 10 shows an alternative protective device 10i with a basic body unit 16i, which has a main body 68i, a main body wall 7Oi, a main body collar 76i, a main body neck 56i and a base body element 146i.
• the semicircular Basic body unit 16i formed a multi-part main body neck 56i, consisting of an outer ring 148i, an inner ring 15Oi and the base member 146i on.
• the base member 146i is configured as a rubber-elastic member 58i disposed on the main body neck 56i between the outer 148i and the inner ring 15Oi.
• the inner ring 15Oi is frictionally arranged on a flange, not shown, of the angle grinder.
• FIG. 11 shows an alternative construction of a protective device 1 Ok having a base element 146k and a tensioning device 152k.
• a segment-shaped rubber-elastic component 58k is arranged between an outer ring 148k and an inner ring 150k of a main body neck 56k of the main body unit 16k.
• the inner ring 150k has a clamping device 152k with a clamping region 154k, by means of which the protective device 10k is frictionally secured via a clamping element 156k, such as a screw, to a flange, not shown, of an angle grinder.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Grinding-Machine Dressing And Accessory Apparatuses (AREA)
• Professional, Industrial, Or Sporting Protective Garments (AREA)
• Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
• Vibration Dampers (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=39800524

Family Applications (1)

Country Status (6)

Cited By (1)

Families Citing this family (3)

Family Cites Families (11)

• 2007
  • 2007-09-27 DE DE102007046311A patent/DE102007046311A1/de not_active Withdrawn
• 2008
  • 2008-07-28 EP EP08786495A patent/EP2205397B1/fr not_active Not-in-force
  • 2008-07-28 WO PCT/EP2008/059854 patent/WO2009043615A1/fr active Application Filing
  • 2008-07-28 RU RU2010116342/02A patent/RU2492040C2/ru not_active IP Right Cessation
  • 2008-07-28 AT AT08786495T patent/ATE549126T1/de active
  • 2008-07-28 CN CN200880108822.4A patent/CN101808779B/zh not_active Expired - Fee Related

Non-Patent Citations (1)

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