EP2185320A1 - Schutzvorrichtung - Google Patents
SchutzvorrichtungInfo
- Publication number
- EP2185320A1 EP2185320A1 EP08760638A EP08760638A EP2185320A1 EP 2185320 A1 EP2185320 A1 EP 2185320A1 EP 08760638 A EP08760638 A EP 08760638A EP 08760638 A EP08760638 A EP 08760638A EP 2185320 A1 EP2185320 A1 EP 2185320A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- base body
- energy absorption
- energy
- connection
- protection device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- 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.
- DE 201 09 169 U1 discloses a protective device, in particular for handheld power tools with a disk-shaped and rotating tool, which has a main body.
- 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 has an energy absorption element which is coupled to the main 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 against. allows above the main 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 understood to mean the operation of a handheld power tool, in which only energy from parts coming into contact with the energy absorbing element acts on the energy absorbing element up to a predetermined value be understood, in which
- 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
- a broken-in-operation disk such as a grinding wheel, a cutting disc, etc.
- 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 absorption element can thus be advantageously achieved a buffer zone on the base body and thereby the base body can be advantageously protected.
- the energy absorbing element alleviates the tendency of the body to fall under a sudden
- 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 handheld power tool can advantageously be averted.
- the coupling is made by means of a force-fit, positive-fit and / or material-locking 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 frictional connection is particularly simple and inexpensive to produce.
- a positive connection 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 sudden burst of energy occurring when the tool breaks causes elastic or plastic deformation of this toothing and then advantageously allows movement of the energy absorbing element in an angular range.
- a cohesive connection 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 be done. 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 absorption element can be limited to a range that is preferably met in the operation of a hand tool machine 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 meaning 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 on the base body in the circumferential direction around the tool stable design of the energy absorption element achieved on the base body, since thus the main body additionally supports the energy absorption element.
- the energy absorption element covers, together with the base body, an angular range of a tool of 180 °.
- 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 a protective device according to the invention with a base body and an energy absorption element in a sectional view
- FIG. 2 shows a section through the protective device of Figure 1 along the line II-II
- 3 shows a partial section of the protective device with a connection of main body and energy absorbing element in a first embodiment
- FIG. 4 shows a partial section of the protective device with a connection in a second embodiment
- FIG 5 shows a partial section of the protective device with a connection in a third embodiment.
- FIG. 1 shows, in a sectional representation, a protective device 10 according to the invention, specifically in the form of a protective hood, which is provided for a hand-held power tool not shown in detail, such as an angle grinder with a disk-shaped and rotating tool 12 (FIG. 2).
- 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 covers an angular range of about 180 ° of the tool 12 ( Figure 2).
- the element 30 is made of sheet steel. However, it can also be made from a suitable natural hard aluminum wrought alloy, which is particularly applicable when weight is to be saved. In principle, however, 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 designed as an edge is arranged on the base body 14, which is initially aligned perpendicular to the plate-shaped steel sheet 30 (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 ( Figure 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 ( Figures 1 and 2).
- the fastening unit 28 comprises a tension band 42, which is formed from spring steel, and a tensioning unit 44.
- the tension 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. pers 14 is formed ( Figures 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 ( Figure 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 recess, not visible here, on a clamping neck of the hand 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 main body 14 to the power tool can also be produced by means of a screw connection, not shown here, between the tensioning band 42 and a gearbox flange, likewise not shown here, of the manual power tool.
- 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 partial region 38 of the protective rim 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) the main body 14 is coupled, 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, at the same time, preferably hugs the inner side 54 of the partial area 36 in an angular range which is predetermined by the main body 14 as a groove-like profile.
- the energy absorption element 16 is preferably designed as an inner protective hood.
- the energy absorbing element 16 is also made Alternatively, the energy absorption element 16 may be at least partially formed by a harder material than the steel sheet 30 of the main body 14, such as in particular by a steel foam, or the energy absorption element 16 may at least partially be made of a softer material be formed as the steel sheet 30 of the base body 14, so that an effective absorption of sparks and / or material particles by the energy absorption 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 main body 14. Together with the base 14, the energy absorption element 16 covers an angular range of 180 ° of the disk-shaped and rotating tool 12 of the hand tool ( Figure 1).
- the resulting fragments are thrown with high kinetic energy onto the annular inner region of the protective device 10 or onto the inner side of the energy absorption element 16.
- 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.
- amount of kinetic energy of the fragments is absorbed.
- the fragments of the ruptured disk-shaped tool 12 are decelerated and exit at a reduced speed from an open area 56 of the protective device 10.
- the coupling of the energy absorption element 16 with the base body 14 is made via a frictional, positive and / or cohesive 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.
- a pressing process of the base body 14 causes Binding of the two parts 14, 16 made to each other by in the partial region 38 of the base body 14 at one or more locations forms 62 are provided.
- These forms 62 may have various shapes, such as round, elliptical, lens and / or rod-shaped. They can, as shown in the sectional view of FIG. 3, only in the partial region 38 of the main body 14 or in other portions 30, 32, 36 of the base body 14 are executed as a continuous 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 radially displace the energy absorption element 16.
- Fig. 5 shows a connection which is designed as a toothing 22.
- the toothing 22 is in the form of a border 68 with axially parallel grooves or knurled teeth 70, 72 for the connection point 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.
- sections of engaged knurled teeth alternate with sections of unmounted 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 made by using suitable fasteners, such as
- Rivets, pins or screws preferably made of soft metals, can be achieved. Cohesive connections are possible by bonding with suitable special adhesives. Also, 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 arising from the breakage of the tool shears off the fastening means or separates the cohesive compound. 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)
- Auxiliary Devices For Machine Tools (AREA)
- Grinding-Machine Dressing And Accessory Apparatuses (AREA)
- Emergency Protection Circuit Devices (AREA)
- Percussive Tools And Related Accessories (AREA)
- Seal Device For Vehicle (AREA)
- Crushing And Pulverization Processes (AREA)
- Sawing (AREA)
Description
Claims
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 (de) | 2007-07-30 | 2008-06-06 | Schutzvorrichtung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2185320A1 true EP2185320A1 (de) | 2010-05-19 |
EP2185320B1 EP2185320B1 (de) | 2010-10-27 |
Family
ID=39877484
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20080760638 Not-in-force EP2185320B1 (de) | 2007-07-30 | 2008-06-06 | Schutzvorrichtung |
Country Status (7)
Country | Link |
---|---|
US (1) | US8137164B2 (de) |
EP (1) | EP2185320B1 (de) |
CN (1) | CN101784370B (de) |
AT (1) | ATE485920T1 (de) |
DE (2) | DE102007035704A1 (de) |
RU (1) | RU2466847C2 (de) |
WO (1) | WO2009015929A1 (de) |
Families Citing this family (7)
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)
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 | Robert Bosch Gmbh, 70469 Stuttgart | Winkelschleiferschutzhaube |
DE102005044298B4 (de) | 2004-10-29 | 2019-08-29 | Andreas Stihl Ag & Co. Kg | Schutzhaube eines handgeführten Trennschleifers |
-
2007
- 2007-07-30 DE DE102007035704A patent/DE102007035704A1/de not_active Withdrawn
-
2008
- 2008-06-06 DE DE200850001673 patent/DE502008001673D1/de active Active
- 2008-06-06 EP EP20080760638 patent/EP2185320B1/de not_active Not-in-force
- 2008-06-06 RU RU2010107384/02A patent/RU2466847C2/ru not_active IP Right Cessation
- 2008-06-06 WO PCT/EP2008/057065 patent/WO2009015929A1/de active Application Filing
- 2008-06-06 CN CN2008801011735A patent/CN101784370B/zh not_active Expired - Fee Related
- 2008-06-06 US US12/444,196 patent/US8137164B2/en not_active Expired - Fee Related
- 2008-06-06 AT AT08760638T patent/ATE485920T1/de active
Non-Patent Citations (1)
Title |
---|
See references of WO2009015929A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN101784370A (zh) | 2010-07-21 |
WO2009015929A1 (de) | 2009-02-05 |
RU2466847C2 (ru) | 2012-11-20 |
RU2010107384A (ru) | 2011-09-10 |
ATE485920T1 (de) | 2010-11-15 |
DE502008001673D1 (de) | 2010-12-09 |
US8137164B2 (en) | 2012-03-20 |
CN101784370B (zh) | 2012-05-30 |
US20090266214A1 (en) | 2009-10-29 |
EP2185320B1 (de) | 2010-10-27 |
DE102007035704A1 (de) | 2009-02-05 |
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