EP2185320B1 - Dispositif de protection - Google Patents

Dispositif de protection Download PDF

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Publication number
EP2185320B1
EP2185320B1 EP20080760638 EP08760638A EP2185320B1 EP 2185320 B1 EP2185320 B1 EP 2185320B1 EP 20080760638 EP20080760638 EP 20080760638 EP 08760638 A EP08760638 A EP 08760638A EP 2185320 B1 EP2185320 B1 EP 2185320B1
Authority
EP
European Patent Office
Prior art keywords
energy absorption
protective device
absorption element
base body
energy
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
EP20080760638
Other languages
German (de)
English (en)
Other versions
EP2185320A1 (fr
Inventor
Cornelius Boeck
Joachim Schadow
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 EP2185320A1 publication Critical patent/EP2185320A1/fr
Application granted granted Critical
Publication of EP2185320B1 publication Critical patent/EP2185320B1/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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/768—Rotatable disc tool pair or tool and carrier
    • Y10T83/7734—With guard for tool

Definitions

  • the invention relates to a protective device according to the preamble of claim 1.
  • the invention is based on a protective device, in particular for handheld power tools with a disk-shaped and rotating tool, with a base body.
  • the protective device comprises an energy absorption element which is coupled to the base body via a coupling which is fixed in a normal operation and in an emergency operation at least one rotational movement of the energy absorbing element allows the body.
  • the coupling takes place in at least one coupling point or at least one coupling region, wherein the rotational movement takes place within the coupling point or within the coupling region.
  • a "normal operation” is to be understood as meaning operation of a handheld power tool in which only energy from parts in contact with the energy absorption element acts on the energy absorption element up to a predetermined value.
  • An “emergency operation” is to be understood as meaning an operation of the handheld power tool in which energy of parts in contact with the energy absorption element acts above the predetermined value on the energy absorption element.
  • the protection device comprising the main body and the energy absorption element is preferably arranged around a disk-shaped and rotating tool of a hand tool, such as an angle grinder, so that sparks and / or material particles and / or in particular rotating and / or with large ones by the protective device during operation of the power tool Balanced outward fragments of a broken-in-operation disk, such as a grinding wheel, a cutting disc, etc., can be advantageously braked or energy, in particular kinetic energy of the particles can be reduced.
  • the basic body is in this case coupled in an endangered area with the energy absorption element by suitable measures such that the energy absorption element absorbs energy upon impact of tool fragments by the energy absorption element executing a rotational movement or a rotary movement to the main body.
  • an "energy absorbing element” is to be understood as an element that due to its material properties and the nature of its coupling with the body particularly good energy, especially kinetic energy, such as rotational energy, translational energy, heat, etc., of parts that come into contact with the energy absorbing element record.
  • the energy absorbing element alleviates the tendency of the body to twist under a sudden force effect by preventing the high material strength of the energy absorbing member from penetrating and locking the broken tool parts into the body.
  • the energy absorbing element which preferably consists of a tough, low-destructive material, thus has the task both to absorb a portion of the impinging force on the energy absorbing element when bursting the tool, as well as to protect the body from damage. In this way, a risk of injury to an operator of the power tool can advantageously be averted.
  • the coupling is made via a frictional, positive and / or material connection between the base body and the energy absorption element.
  • a frictional engagement is produced, for example, by a forming process on the interconnected guard parts at partial locations by means of press fit.
  • the static friction between the main body and the energy absorbing element overcome, and the two components can advantageously perform a relative movement to each other by a certain angular range. This absorbs some of the energy and reduces the velocity of the fragments leaving the guard.
  • the frictional connection is particularly simple and inexpensive to produce.
  • the connection of the base body and the energy absorption element takes place, for example, as a toothing.
  • the toothing initially prevents a displacement of the energy absorption element relative to the base body in the radial direction.
  • the abruptly occurring at breakage of the tool energy burst causes elastic or plastic deformation of this toothing and then advantageously allows a movement of the energy absorbing element in an angular range.
  • the two protective device parts are joined together by means of gluing, joining, welding, etc., so that the abruptly occurring energy burst during rupture of the tool causes a separation of the cohesive connection, whereby advantageously the relative movement of the energy absorbing element relative to the main body can take place. In this case, no additional fastening means are necessary.
  • connection has at least one predetermined separation point and / or at least one predetermined separation region.
  • a coupling point or a coupling region is to be understood by a “predetermined separation point” or by a “predetermined separation region” which is separated at a predetermined load of the protective device.
  • the predetermined separation point and / or the predetermined separation region is or are designed in such a way that, upon introduction of a energy pulse having a predetermined value into the energy absorption element, the rotational movement of the energy absorption element with respect to the main body occurs.
  • the energy absorbing element is in normal operation, i. at a burst of energy below the predetermined value, fixedly coupled to the body and leads only in emergency mode, i. at a burst of energy above the predetermined value, a rotational movement relative to the base body.
  • the energy absorption element is designed as an edge.
  • the energy absorbing element can be limited to a range that is preferably taken in the operation of a hand tool of sparks, material particles and / or fragments of broken tools.
  • the energy absorption element is adapted to an edge of the base body.
  • An "edge of the base body” is to be understood here as a partial region of the base body which is aligned parallel to a thickness of a tool, in particular a grinding or cutting disk, and is arranged around the tool on the base body in the circumferential direction.
  • the energy absorption element covers an angular range of a tool of 180 ° together with the base body.
  • a particularly advantageous shielding of sparks, material particles and / or fragments of a burst tool moving radially outwards with high energy is achieved for an operator of a handheld power tool with the protective device.
  • FIG. 1 shows in a sectional view of a protective device 10 according to the invention, in the form of a protective hood, which for a hand tool, not shown, such as an angle grinder, with a disc-shaped and rotating tool 12 (FIG. FIG. 2 ) is provided.
  • the protective device 10 comprises a base body 14 and a fastening unit 28.
  • the main body 14 is provided for protection of an operator of the power tool from sparks and / or material particles that arise during operation of the power tool.
  • the base body 14 is formed by a plate-shaped element 30 which has a semicircular design, wherein the plate-shaped element 30 has an angular range of approximately 180 ° of the tool 12 (FIG. FIG. 2 ) covers.
  • the element 30 is made of sheet steel.
  • it can also be made of a suitable natural hard Aluminum wrought alloy exist, which is particularly applicable when weight is to be saved.
  • other materials that appear appropriate to a person skilled in the art and that have sufficient strength and hardness, such as, for example, a carbon fiber construction, are conceivable for forming the main body 14.
  • a protective edge 34 formed as an edge is arranged on the base body 14, which is initially aligned perpendicular to the plate-shaped steel sheet 30 (FIG. FIG. 2 ).
  • aligned portion 36 of the protective edge 34 is followed perpendicular thereto, a further portion 38 of the protective edge 34, which is additionally aligned parallel to the plate-shaped steel sheet 30 ( FIG. 2 ).
  • the further portion 38 of the protective edge 34 also extends radially inwardly.
  • the two sections 36, 38 of the protective edge 34 and the plate-shaped steel sheet 30 are made in one piece in a sheet metal forming process.
  • the fastening unit 28 is arranged on the base body 14 ( FIGS. 1 and 2 ).
  • the fastening unit 28 comprises a tensioning band 42, which is formed from spring steel, and a tensioning unit 44.
  • the tensioning band 42 is ring-shaped and arranged around a semicircular edge 46 of the base body 14, wherein the semicircular edge 46 is perpendicular to the plate-shaped steel sheet 30 of the base body 14 is formed ( FIGS. 1 and 2 ).
  • the semicircular edge 46 of the main body 14 and the plate-shaped steel sheet 30 are made in one piece in a sheet metal forming process ( FIG. 2 ).
  • the tension band 42 is preferably welded to the base body 14. In principle, other connections that appear appropriate to the person skilled in the art between the tension band 42 and the base body 14 are also conceivable, for example a connection by a pressure joining method, etc.
  • the annular clamping band 42 is clamped by means of the clamping unit 44 about a receiving area, not shown, of a hand tool machine by shortening or widening a circumference of the annular clamping band 42 together with the clamping unit 44.
  • the connection of the base body 14 and the power tool is permanently locked by means of a clamping lever 48 designed as a hinge.
  • the annular clamping band 42 in the region of the clamping unit 44 has a rib-shaped locking element 50 which extends along a portion 52 of the annular clamping band 42 ( FIG. 1 ) and engages in a non-visible recess on a clamping neck of the power tool.
  • the rib-shaped locking element 50 is provided for locking the base body 14, so that the base body 14 is arranged non-rotatably about the disc-shaped and rotating tool 12 of the power tool.
  • the locking member 50 provides a coding function for a proper assignment of the protective device 10 to the power tool.
  • connection of the base body 14 with the power tool can also be made via a screw connection, not shown here, between the clamping band 42 and a gear flange of the hand tool machine, also not shown here.
  • a not-shown knob-shaped, located on the clamping band 42 element engages in a recess on the flange of the angle grinder and prevented by this positive locking a twisting of the guard on the flange.
  • an energy absorption element 16 is arranged between the subregion 38 of the protective edge 34 and the plate-shaped steel sheet 30 along the semicircular formation of the steel sheet 30 in an inner side 54 of the protective region 34 facing the tool 12 ( FIGS. 1 and 2 ), which is coupled to the base body 14, wherein the coupling is carried out firmly in normal operation and in emergency operation at least one rotational movement of the energy absorbing element 16 relative to the base body 14 allows.
  • the energy absorption element 16 is adapted to an edge 26 of the main body 14 and conforms to the contour preferably equal to a groove-like profile of the inner side 54 of the portion 36 in an angular range which is predetermined by the base body 14.
  • the energy absorption element 16 is preferably designed as an inner protective hood.
  • the energy absorbing element 16 is also made Alternatively, the energy absorbing element 16 may be at least partially formed by a harder material than the steel sheet 30 of the base body 14, such as in particular a steel foam, or the energy absorbing element 16 may be at least partially formed of a softer material as the steel sheet 30 of the main body 14, so that an effective absorption of sparks and / or material particles by the energy absorbing element 16 takes place. In principle, other materials that appear appropriate to the person skilled in the art for the energy absorption element 16 are also conceivable.
  • a thickness 58 of the energy absorption element 16 is at least partially smaller than a thickness 60 of the base body 14. Together with the base body 14, the energy absorption element 16 covers an angular range of 180 ° of the disk-shaped and rotating tool 12 of the portable power tool (FIG. FIG. 1 ).
  • the resulting fragments are spun onto the annular inner region of the protective device 10 or onto the inner side of the energy absorption element 16 with high kinetic energy.
  • the force of the impact provides a tangential force which tends to twist the energy absorbing member 16 out of position in a radial direction.
  • Part of the kinetic energy of the fragments is absorbed.
  • the fragments of the ruptured disc-shaped tool 12 are decelerated and exit at a reduced speed from an open area 56 of the protection device 10.
  • the coupling of the energy absorbing element 16 with the base body 14 is made via a frictional, positive and / or material connection.
  • the connection has at least one predetermined separation point and / or at least one predetermined separation region.
  • the predetermined separation point and / or the predetermined separation region are / is designed in such a way that upon the introduction of an energy impulse with a predetermined value into the energy absorption element 16, the rotational movement of the energy absorption element 16 with respect to the main body 14 occurs.
  • FIG. 3 shows a connection which is designed as a clamping connection 18. This is a frictional connection, which takes place by friction. Between the main body 14 and the energy absorption element 16 is by a forming process of the base body 14, a press connection Both parts 14, 16 made to each other by 62 occurrences 62 are provided in the subregion 38 of the base body 14 at one or more locations. These forms 62 may have various shapes, such as round, elliptical, lens and / or rod-shaped. You can, as in the sectional view of the Fig. 3 shown, only in the portion 38 of the body 14 or in other portions 30, 32, 36 of the body 14 are executed as continued impressions.
  • Fig. 4 shows a connection which is designed as a snap connection 20.
  • shapes are formed as molding 64 on both components (base body 14 and energy absorption element 16).
  • the energy released upon breakage of the tool 12 is required to cause elastic deformation of the base body 14 and the energy absorption element 16 or the portion 38 of the protection device 10 and to displace the energy absorption element 16 radially.
  • One or more ratchet teeth 66 attached to the circumference of the open portion 38 prevent a change in position of the energy absorbing element 16 in the axial direction.
  • Fig. 5 shows a compound which is designed as a toothing 22.
  • the toothing 22 in the form of a knurl 68 with paraxial grooves or knurled teeth 70, 72 for the junction of both Components 14, 16 are selected, that is, both the base 14 and the energy absorption element 16 have knurled teeth 70, 72, which can be engaged with each other.
  • the energy absorbing element 16 has both segment-like sections with knurled teeth 72 and segment-like sections without knurling teeth 72, however, with recesses 74, wherein the sections alternate.
  • portions with engaged knurled teeth alternate with portions that do not engage knurled teeth.
  • a twisting of the energy absorbing element 16 relative to the base body 14 is possible only by shearing the tips of the knurling teeth 70, 72.
  • connection can be achieved by using suitable fasteners, such as rivets, pins or screws, preferably made of soft metals.
  • suitable fasteners such as rivets, pins or screws
  • Cohesive connections are possible by bonding with suitable special adhesives.
  • steel structures by welding methods are conceivable in which partially (e.g., punctiformly) both parts are joined together. In this case, only a relative movement between the base body and the energy absorption element can take place if the energy impact occurring at the time of the break of the tool shears off the fastening means or separates the cohesive connections. That the predetermined breaking point of a positive connection is designed, for example, for shearing. The shearing of the fastening means takes place at a predetermined force acting on the fastening means.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Professional, Industrial, Or Sporting Protective Garments (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Auxiliary Devices For Machine Tools (AREA)
  • Seal Device For Vehicle (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Sawing (AREA)

Claims (10)

  1. Dispositif de protection (10), en particulier pour machines-outils à main, comprenant un outil rotatif en forme de disque (12), avec un corps de base (14), caractérisé par un élément d'absorption d'énergie (16), qui est accouplé au corps de base (14) par le biais d'un accouplement qui est réalisé sous forme fixe dans un fonctionnement normal, et qui permet, en cas de fonctionnement de secours, un mouvement de rotation de l'élément d'absorption d'énergie (16) par rapport au corps de base (14).
  2. Dispositif de protection selon la revendication 1, caractérisé en ce que l'accouplement est réalisé par le biais d'une connexion par engagement par force, par correspondance géométrique et/ou par liaison de matière.
  3. Dispositif de protection selon la revendication 2, caractérisé en ce que la connexion est réalisée sous forme de connexion par serrage (18).
  4. Dispositif de protection selon la revendication 2 ou 3, caractérisé en ce que la connexion est réalisée sous forme de connexion par encliquetage (20).
  5. Dispositif de protection selon l'une quelconque des revendications 2 à 4, caractérisé en ce que la connexion est réalisée sous forme de denture (22).
  6. Dispositif de protection selon l'une quelconque des revendications 2 à 5, caractérisé en ce que la connexion présente au moins un point destiné à la rupture et/ou au moins une zone destinée à la rupture.
  7. Dispositif de protection selon la revendication 6, caractérisé en ce que le point destiné à la rupture et/ou la zone destinée à la rupture sont conçus de telle sorte que lors de l'introduction d'un choc énergique d'une valeur prédéfinie dans l'élément d'absorption d'énergie (16), il se produise le mouvement de rotation de l'élément d'absorption d'énergie (16) par rapport au corps de base (14).
  8. Dispositif de protection selon l'une quelconque des revendications précédentes, caractérisé en ce que l'élément d'absorption d'énergie (16) est réalisé sous forme de bord (24).
  9. Dispositif de protection selon l'une quelconque des revendications précédentes, caractérisé en ce que l'élément d'absorption d'énergie (16) est adapté à un bord (26) du corps de base (14).
  10. Dispositif de protection selon l'une quelconque des revendications précédentes, caractérisé en ce que l'élément d'absorption d'énergie (16) couvre conjointement avec le corps de base (14) une zone angulaire de l'outil (12) de 180°.
EP20080760638 2007-07-30 2008-06-06 Dispositif de protection Not-in-force EP2185320B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007035704A DE102007035704A1 (de) 2007-07-30 2007-07-30 Schutzvorrichtung
PCT/EP2008/057065 WO2009015929A1 (fr) 2007-07-30 2008-06-06 Dispositif de protection

Publications (2)

Publication Number Publication Date
EP2185320A1 EP2185320A1 (fr) 2010-05-19
EP2185320B1 true EP2185320B1 (fr) 2010-10-27

Family

ID=39877484

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20080760638 Not-in-force EP2185320B1 (fr) 2007-07-30 2008-06-06 Dispositif de protection

Country Status (7)

Country Link
US (1) US8137164B2 (fr)
EP (1) EP2185320B1 (fr)
CN (1) CN101784370B (fr)
AT (1) ATE485920T1 (fr)
DE (2) DE102007035704A1 (fr)
RU (1) RU2466847C2 (fr)
WO (1) WO2009015929A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005062458A1 (de) * 2005-12-27 2007-07-05 Robert Bosch Gmbh Schutzhaube für ein Handwerkszeug
DE102007046311A1 (de) * 2007-09-27 2009-04-02 Robert Bosch Gmbh Schutzvorrichtung
DE102011089758A1 (de) * 2011-12-23 2013-06-27 Robert Bosch Gmbh Schutzhaubenverdrehsicherungsvorrichtung
DE102012214834A1 (de) * 2012-08-21 2014-02-27 Robert Bosch Gmbh Schutzhaubenvorrichtung
US10201889B2 (en) * 2014-08-06 2019-02-12 Sparky Guard, LLC Fully rotatable grinder guard assembly and method for making same
JP6571463B2 (ja) * 2015-09-10 2019-09-04 株式会社マキタ グラインダ、及びカバー
CN112496960B (zh) * 2020-11-26 2022-11-22 重庆市巨亮机械制造有限责任公司 一种具有抱闸组件的砂轮机

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3129537A (en) * 1961-07-31 1964-04-21 Norton Co Protective device for grinding machines
US3571983A (en) * 1969-05-06 1971-03-23 Cincinnati Milacron Inc Guard system
US3638364A (en) * 1970-02-19 1972-02-01 Cincinnati Milacron Inc Guard device for machine tools
US3694971A (en) * 1970-08-31 1972-10-03 Cincinnati Milacron Inc Guard system for high speed grinder
DE2232350C3 (de) * 1971-07-06 1978-05-11 Tos Hostivar, N.P., Prag-Hostivar (Tschechoslowakei) Schutzhaube für Unifangsschleifscheiben
SU495192A1 (ru) * 1973-04-11 1975-12-15 В Есоюзный Научно-Исследовательский Институт По Монтажным И Специальным Строительным Работам Ручна машина
US3902286A (en) * 1974-08-30 1975-09-02 Cincinnati Milacron Inc Grinding wheel guard with energy absorbing apparatus
SE506590C2 (sv) * 1996-05-13 1998-01-19 Electrolux Ab Sprängskydd vid cirkelformigt verktyg
RU2152862C2 (ru) * 1998-08-10 2000-07-20 Закрытое Акционерное Общество "Энерпред" Ручная шлифовальная машина
US6464573B1 (en) 2000-06-30 2002-10-15 Porter-Cable Corporation Guard attachment system with knurled clamp ring
DE20109169U1 (de) 2001-06-01 2002-10-10 Bosch Gmbh Robert Winkelschleiferschutzhaube
DE102005044298B4 (de) * 2004-10-29 2019-08-29 Andreas Stihl Ag & Co. Kg Schutzhaube eines handgeführten Trennschleifers

Also Published As

Publication number Publication date
ATE485920T1 (de) 2010-11-15
WO2009015929A1 (fr) 2009-02-05
US8137164B2 (en) 2012-03-20
CN101784370B (zh) 2012-05-30
DE102007035704A1 (de) 2009-02-05
EP2185320A1 (fr) 2010-05-19
RU2466847C2 (ru) 2012-11-20
CN101784370A (zh) 2010-07-21
RU2010107384A (ru) 2011-09-10
DE502008001673D1 (de) 2010-12-09
US20090266214A1 (en) 2009-10-29

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