EP1708851A1 - Elektrohandwerkzeug - Google Patents
ElektrohandwerkzeugInfo
- Publication number
- EP1708851A1 EP1708851A1 EP05701164A EP05701164A EP1708851A1 EP 1708851 A1 EP1708851 A1 EP 1708851A1 EP 05701164 A EP05701164 A EP 05701164A EP 05701164 A EP05701164 A EP 05701164A EP 1708851 A1 EP1708851 A1 EP 1708851A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electric hand
- hand tool
- protective hood
- tool
- tool according
- 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
- 230000001681 protective effect Effects 0.000 claims abstract description 85
- 239000000428 dust Substances 0.000 description 6
- 238000003754 machining Methods 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 4
- 230000004224 protection Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 230000036544 posture Effects 0.000 description 1
- 230000009979 protective mechanism Effects 0.000 description 1
- 238000009420 retrofitting Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
- B27G19/00—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws
- B27G19/02—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for circular saws
- B27G19/04—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for circular saws for manually-operated power-driven circular saws
Definitions
- the invention relates to an electric hand tool with a rotatably drivable, disk-shaped tool with a protective hood that can be attached to the electric hand tool and that is at least limited or partially rotatable about an axis parallel to or coaxial to a shaft, wherein a tool can be completely covered in a rest position of the protective hood and by a restoring device, a restoring force acts on the protective hood in the direction of the rest position and the protective hood comprises a fixed part.
- Such a handheld power tool can be designed, for example, as a hand-held angle grinder or a hand-held circular saw.
- a cutting disc which represents the disk-shaped tool is covered by a fixed protective hood over approximately 180 ° of its circumference.
- the protective hood can be rigidly mountable or removable and at least partially covers the area of the cutting disc facing the user. The area of the cutting disc facing away from the user is exposed and is used for machining the workpiece.
- the disc-shaped tool is formed from a substantially circular disc-shaped saw blade.
- the saw blade can be almost completely shielded by means of a protective cover which can be pivoted substantially about the axis of rotation of the saw blade.
- the protective cover When the saw blade is immersed in a plate-like workpiece to be machined, the protective cover either opens automatically or after a lock is triggered. As soon as the saw blade is removed from the workpiece to be machined, the protective cover closes automatically.
- a hand-held power tool is known, for example, from DE 101 10 119 AI, which describes an electric hand tool with a disk-shaped tool that can be driven in rotation, comprising a pivotable tool cover.
- the Tool cover can be designed such that the front side of the tool cover, when actuated, crosses at least a part of the surface of the disk-shaped tool in a direction transverse to the circumferential direction thereof and has an essentially curved end face.
- a fixed protective hood is provided, which covers the circumference of the tool towards the user.
- the swivel axis for the tool cover is provided eccentrically to the spindle axis of the tool.
- DE 30 37 573 C2 discloses a two-part protective and exhaust hood for angle grinding machines, comprising a stationary hood part and a pivotably mounted hood part, both hood parts being sector-shaped and the sector angle of the first hood part being smaller than the sector angle of the second hood part , whereby by pivoting the pivotable second hood part an additional work area for corner processing is free.
- the disadvantage here is that the tool is not completely covered in the rest position.
- DE 101 07 290 AI discloses a protective device for electric hand-held machines, comprising a rigid and a rotatable part which almost completely covers the danger zone.
- a reset device is provided which ensures that the pivotable part is pivoted back into a rest position.
- the disadvantage here is the low flexibility.
- the German utility model G 90 05 339.7 discloses a rotating tool, in particular one
- Pendulum grinding machine in which a rotatable protective hood is provided in addition to a rigid protective hood, an actuator being provided for the second protective hood, the actuator being inevitably to be controlled as a function of the operating conditions.
- a rotatable protective hood is provided in addition to a rigid protective hood, an actuator being provided for the second protective hood, the actuator being inevitably to be controlled as a function of the operating conditions.
- a full protective hood for a portable machine tool is known from German utility model G 85 32 524.4, which fully surrounds the cutting tool, in particular for angle grinders, with a rigid hood part and a pendulum hood, the hood part and pendulum hood together being a closed part, essentially only in the area of the Form the tool shaft open space and enclose the cutting tool.
- the pendulum hood is to be attached in such a way that during operation the pendulum hood swivels backwards into the upper hood part by placing it on the workpiece with the direction of rotation of the tool shaft, and after completion of the work process the pendulum hood slides forward again and forms full protection again. although the cutting tool is still rotating.
- the invention is based on the object of providing a further hand tool which meets the current guidelines and at the same time enables work in all positions.
- the invention solves this problem by means of an electric hand tool of the generic type, in which the protective hood comprises two or more movable parts which, together with the fixed part, completely cover the tool in the rest position.
- the protective hood comprises two or more movable parts which, together with the fixed part, completely cover the tool in the rest position.
- Such a design with a fixed part and at least two or more movable protective hood parts, the tool being completely enclosed in a rest position has the advantage that only a small pivoting or displacement path of the individual parts or segments of the movable protective hood is necessary.
- the displacement path can be realized in part by two adjoining protective hood parts, so that no large displacement paths are necessary and a large number of machining positions can nevertheless be achieved.
- a so-called "counter-cut” can also be used in, for example, an angle grinder State of the art is not used due to dust and flying sparks. Since then, the opposite cut has only been used on hand-held circular saws. By using this cutting direction, however, the application forces can be reduced and the cutting speed increased.
- the electric hand tool has a protective hood with three or more movable parts, which are in particular segmented like a telescope and can be pushed into one another.
- the processing area can be arranged between each of the parts or segments and an adjacent part or segment. The provision of more than two parts that can be pushed into one another significantly improves safety while at the same time providing a high degree of flexibility in the work area.
- the segments can also abut one another in an abrupt manner and be prestressed against one another.
- the movable parts of the protective hood can extend into the area of the rigid protective hood that can at least partially cover or accommodate the movable parts.
- a partial area of either between any or only certain segments Tool can be freed from the protective hood as a work area, an advantage is achieved for the flexibility of the size of the work area by the telescopically telescoping parts.
- the movable protective hood can also span 360 °, for example.
- the maximum work area to be provided must be minimally left out. It can be provided that a working area cannot be defined between each of the individual parts in the case of a telescopic design of the segments.
- the parts between which a work area can be defined can be freely moved to the desired work position without opening up any other areas.
- the parts between which the work area can be stretched are loaded against one another in the rest position.
- the individual segments slide into each other, for example the innermost segment being the segment that is closest to the defined work area.
- the segments can be partially covered by the rigid protective hood, which covers the area facing the user, and can be guided therein.
- the entire movable protective hood can be pivoted freely with respect to the fixed protective hood, at least in the area that is not covered by the fixed protective hood.
- the strong division in particular can reduce the space required for moving the individual parts.
- the displacement path can be further reduced and the safety of the machine can also be ensured over longer cutting distances, since only a small one Opening angle and thus there is only a slight exposure of the tool.
- the fixed part of the protective hood points in the direction of a housing of the electric hand tool or of the user and is in particular arranged symmetrically to the longitudinal axis of the housing.
- the fixed part can cover essentially 120 ° of the grinding wheel.
- a larger angular range can be used to machine workpieces.
- the two movable parts each cover essentially 120 ° of the tool in the rest position.
- the movable parts of the protective cover each cover essentially 180 ° or between 180 ° and 120 °, and when the protective cover is opened, the movable parts either slide past one another within the fixed part or can be telescopically pushed into one another, so that Regardless of the angular position on the tool that is to be used for machining, the entire remaining area of the tool is always enclosed by the protective hood.
- the movable protective hood parts are preferably divided into equal parts over the free circumference, which is not covered by the fixed protective hood part.
- the fixed part is non-detachably connected to the machine housing.
- the moving part must be permanently connected to prevent disassembly by the user.
- the protective hood is opened automatically by contact with the workpiece to be machined, the opening taking place only as much as is absolutely necessary for the tool to be exposed for machining.
- feed devices for a workpiece are provided on one or more of the movable parts of the protective hood in the region of the contact points between the movable parts, which are provided for releasing a work area.
- the protective hood can be operated manually, for example an opening device provided for opening the protective hood can be arranged in the region of a handle provided on an electric hand tool.
- a suction device can be connected to the electric hand tool, the suction device being able to have a connection option, in particular in the area of the fixed part of the protective hood.
- a corresponding arrangement of the suction device does not impair the safety devices, in particular on Housing of the electric hand tool, the supply to the suction device can take place safely or appropriate dust collection devices can be attached.
- Figure 1 shows an angle grinder in a side view
- Figure 2 shows the angle grinder according to Figure 1 in a view from below.
- FIG. 1 shows an angle grinder in a side view, which is provided in its entirety with the reference numeral 10.
- the angle grinder comprises a machine housing 12 which has a longitudinal axis 14, along which the machine housing extends.
- the machine housing 12 comprises an end 16 on the tool side and an opposite end 18, on which a cable 20 is provided for connection to a power supply network.
- a drive motor is provided in the machine housing 12, which drives a tool, here a grinding wheel 22, in a rotating manner via a shaft.
- a deflection gear (not shown) is provided, via which the rotary movement in the direction of the axis 14 is deflected into a rotary movement in the direction of an axis 24, which corresponds to the axis of rotation of the tool 22 and runs through the center of the tool.
- the deflecting gear is arranged in a gear housing 26 which is connected to the motor housing or machine housing 12.
- a gear housing 26 which is connected to the motor housing or machine housing 12.
- a rigid or fixed part of a protective hood 28 which serves to partially cover the tool 22, the fixed part of the protective hood 28 in the direction of the machine housing and thus is directed towards an operator of the electric hand tool at a normal operating position.
- the housing 12 can be made of plastic, in particular in the form of a clamshell housing, which is produced by injection molding.
- a connection piece 30 can also be arranged in one piece with this, to which an external dust extraction device can be connected, as a result of which the development of dust during grinding in particular can be significantly reduced. This reduces the environmental impact, but also the burden on the operator with grinding dust, which is sometimes hazardous to health.
- the housing 12 itself serves as the first handle, the housing 12 being gripped by the operator with one or both hands, so that the machine can be held and positioned in this way.
- a movable part of the protective hood 32 is also provided, which consists of at least two parts.
- the movable part 32 of the protective cover covers the part of the tool 22 which is directed away from the operator.
- the protective cover encompasses the tool on both its upper and lower sides and only leaves an opening on the underside for the person carrying the tool Shaft 34, which runs coaxially to the longitudinal axis 24 of the grinding tool.
- the fixed portion 28 and the movable portions 32 of the protective cover together also essentially have a circular shape, the diameter of the Protective hood is designed larger than the diameter of the tool 22.
- FIG. 2 now shows the angle grinder 10 in a view from below in the direction of arrow II.
- the view from below shows the division of the protective hood into fixed 28 and movable components 32.
- the fixed part 28 essentially encloses a region of 120 ° of the tool 22, the arrangement of the fixed part 28 running symmetrically to the longitudinal axis 14 of the housing 12.
- the movable components 32a and 32b each enclose essentially 180 ° of the tool, wherein the movable part 32b can be telescopically inserted into the movable part 32a and, moreover, both movable parts are guided telescopically within the rigid part 28.
- the movable components 32a and 32b are equipped with a feed device 36 which is formed by two projections on the circumference of the movable parts 32a and 32b in the region of the contact surfaces between the movable components of the protective hood, the two projections forming a V-shaped region between include each other, provided the protective device is in the rest position and the workpiece to be machined is inserted in the direction of arrow 38 between the projections and securely guided through the V-shaped intermediate space and thus leads to a spreading apart of the movable components 32a and 32b of the protective hood, the components being rotated about the longitudinal axis 24.
- a feed device 36 which is formed by two projections on the circumference of the movable parts 32a and 32b in the region of the contact surfaces between the movable components of the protective hood, the two projections forming a V-shaped region between include each other, provided the protective device is in the rest position and the workpiece to be machined is inserted in the direction of arrow 38 between the projections and securely guided
- Both movable components of the protective hood 32a and 32b are biased by a spring, the spring force acting in the direction of the other protective hood components 32a and 32b.
- the moveable protective hood parts over 180 ° ensure that only a small part of the tool is released, which ensures the greatest possible coverage of the tool at all times and thus the greatest possible protection of the environment and the operator.
- a manual opening device 40 can also be provided, which can be attached to an additional handle 42, the additional handle 42 being attached to the fixed protective hood 28 is arranged.
- the additional handle 42 By means of the additional handle 42, the hand-held power tool can be guided even more reliably in two-hand operation, even with larger acting forces.
- an angle grinder can be provided which ensures the greatest possible protection and at the same time enables particularly ergonomic work in the largest possible angular range using the tool 22.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Grinding-Machine Dressing And Accessory Apparatuses (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Surgical Instruments (AREA)
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102004004333A DE102004004333A1 (de) | 2004-01-29 | 2004-01-29 | Elektrohandwerkzeug |
| PCT/EP2005/000701 WO2005072911A1 (de) | 2004-01-29 | 2005-01-25 | Elektrohandwerkzeug |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1708851A1 true EP1708851A1 (de) | 2006-10-11 |
| EP1708851B1 EP1708851B1 (de) | 2008-10-22 |
Family
ID=34801152
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP05701164A Expired - Lifetime EP1708851B1 (de) | 2004-01-29 | 2005-01-25 | Elektrohandwerkzeug |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1708851B1 (de) |
| AT (1) | ATE411874T1 (de) |
| DE (2) | DE102004004333A1 (de) |
| WO (1) | WO2005072911A1 (de) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008022294A1 (de) * | 2008-04-28 | 2009-10-29 | C. & E. Fein Gmbh | Schutzhaube für ein Schleifgerät |
| JP4866956B2 (ja) * | 2009-05-19 | 2012-02-01 | 株式会社呉英製作所 | 防塵カバー構造体、研削装置及び切削装置 |
| DE102010064184B4 (de) | 2010-12-27 | 2023-02-09 | Robert Bosch Gmbh | Verfahren zum Betrieb einer Einspritzanlage für eine Brennkraftmaschine |
| DE102013002713B4 (de) | 2013-02-16 | 2014-08-28 | Audi Ag | Drehstabfederanordnung für eine Radaufhängung eines Kraftfahrzeugs |
| EP3208038B2 (de) * | 2014-07-11 | 2023-12-13 | Festool GmbH | Hand-trenngerät |
| JP7107554B2 (ja) * | 2018-06-05 | 2022-07-27 | 株式会社呉英製作所 | 防塵カバー |
| US11685017B2 (en) | 2020-02-07 | 2023-06-27 | West Bufkin Industries, Llc | Storage shield for angle grinding disc |
| WO2023097281A1 (en) | 2021-11-24 | 2023-06-01 | Milwaukee Electric Tool Corporation | Grinder including enhanced sensing and component detection |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2274421A (en) * | 1939-11-21 | 1942-02-24 | Linn Olaf B Lindstrom | Power driven pruning device |
| GB724728A (en) * | 1953-04-23 | 1955-02-23 | Durell & Company Ltd R | Circular saw guards |
| US3805639A (en) * | 1972-11-21 | 1974-04-23 | Best & Donovan | Safety guard for a breaking saw |
| DE3505040A1 (de) * | 1985-02-14 | 1986-08-14 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Handkreissaege oder dergleichen elektrowerkzeug mit einem zweischalig ausgebildeten gehaeuse |
| SE443532B (sv) * | 1985-02-25 | 1986-03-03 | Kaj Mickos | Undanforbar skyddskapa for handverktyg med roterbart, skivformigt verktyg |
| US5537748A (en) * | 1991-07-09 | 1996-07-23 | Ryobi Limited | Cover structure for electric circular saw |
| US5542183A (en) * | 1994-12-23 | 1996-08-06 | Allison; Philip | Firefighter's ceiling cutting tool |
| DE10107290A1 (de) * | 2001-02-16 | 2002-09-05 | Esau Ulrich | Schutzvorrichtung für Elektrohandmaschine |
| DE10110119A1 (de) * | 2001-03-02 | 2002-09-12 | Bosch Gmbh Robert | Handwerkzeugmaschine |
| US6722046B2 (en) * | 2001-09-04 | 2004-04-20 | Ben L Evenson | Portable forward cutting power saw |
-
2004
- 2004-01-29 DE DE102004004333A patent/DE102004004333A1/de not_active Ceased
-
2005
- 2005-01-25 EP EP05701164A patent/EP1708851B1/de not_active Expired - Lifetime
- 2005-01-25 AT AT05701164T patent/ATE411874T1/de active
- 2005-01-25 DE DE502005005747T patent/DE502005005747D1/de not_active Expired - Lifetime
- 2005-01-25 WO PCT/EP2005/000701 patent/WO2005072911A1/de not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2005072911A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102004004333A1 (de) | 2005-08-18 |
| ATE411874T1 (de) | 2008-11-15 |
| EP1708851B1 (de) | 2008-10-22 |
| WO2005072911A1 (de) | 2005-08-11 |
| DE502005005747D1 (de) | 2008-12-04 |
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