EP1940594A1 - Portable power tool - Google Patents
Portable power toolInfo
- Publication number
- EP1940594A1 EP1940594A1 EP05806448A EP05806448A EP1940594A1 EP 1940594 A1 EP1940594 A1 EP 1940594A1 EP 05806448 A EP05806448 A EP 05806448A EP 05806448 A EP05806448 A EP 05806448A EP 1940594 A1 EP1940594 A1 EP 1940594A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sleeve
- motor housing
- handle
- housing
- hand tool
- 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
- 238000013016 damping Methods 0.000 claims abstract description 82
- 239000000463 material Substances 0.000 claims description 18
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000001746 injection moulding Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 9
- 230000006870 function Effects 0.000 description 5
- 230000003993 interaction Effects 0.000 description 5
- 230000000630 rising effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 230000009993 protective function Effects 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
- B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
- B25F5/006—Vibration damping means
Definitions
- the invention relates to a handheld power tool with a motor housing and a separate handle housing which is fastened to the motor housing by means of an elastic vibration damper and is positively secured thereon.
- Such a machine tool is known from WO 2004/039541 Al 1 of the known.
- the cited document proposes a vibration damper which comprises a holder on the side of the motor housing and a mounting plate on the side of the handle housing, between which an annular damping element is located in the axial direction is arranged.
- the three components of the vibration damper are stacked on top of one another in the axial direction and penetrated by a number of helical securing elements in the axial direction.
- the mounting plate is positively secured to the securing elements. A loosening of the rear handle held on the mounting plate from the motor housing when the damping element is damaged is prevented.
- the aforementioned arrangement requires considerable space in the axial and radial directions and is complicated in construction.
- the soft damping element is unprotected in the peripheral area and is exposed to the harsh environmental conditions prevailing there during operation.
- the invention has for its object to develop a generic machine tool such that a Damping and securing function is ensured with a simplified structure.
- a handheld power tool wherein the vibration from a motor housing associated fixing sleeve, a coaxial 'gungs-' the Fixed To sleeve surrounds elastic damping sleeve, and a likewise coaxial with the mounting sleeve and the damping sleeve encompassing assigned to the handle housing Griffhal- constructed ter.
- the essentially rigid assembly consisting of the handle holder and the handle housing is positively secured with play directly to the essentially rigid assembly consisting of the fastening sleeve and the motor housing.
- the fastening sleeve, the elastic damping sleeve and the handle holder are layered in the radial direction, which allows a thin-walled construction.
- the backlash-like, form-fitting securing of the essentially rigid assembly from the handle holder and the handle housing to the also essentially rigid assembly from the fastening sleeve and the motor housing permits free elastic, vibration-damping relative shaping between the two rigid assemblies and thus effective vibration decoupling.
- the positive engagement with play secures the handle housing on the motor housing without hindering the vibration decoupling. Due to the direct positive locking between the two aforementioned units, additional securing elements can be dispensed with.
- the vibration damper needs to have no geometric adjustment to accommodate such security elements, which contributes to the reduction of its construction volume.
- the damping sleeve can be designed solely from the point of view of the required damping effect, without its function being impaired by separate securing elements.
- the handle housing overlaps the vibration damper in the axial direction in the direction of the motor housing and is directly on with play
- the security chain consists of only two links, namely the handle housing and the motor housing, while all other links such as the fastening sleeve, the damping sleeve and the handle holder are removed from this security chain.
- the safety function is not only limited to damage in the damping sleeve, but also covers damage to the mounting sleeve or the handle holder. Furthermore, the arrangement of the handle housing that extends over the outside leads to a protective function of the vibration damper. All individual components of the vibration damper are covered on the outside by the overlapping area of the handle housing. Dirt, moisture, UV radiation or other adverse environmental influences are kept away from the vibration damper.
- the motor housing has a circumferential groove which is open radially outwards and into which a radially inwardly directed ring flange of the handle housing engages with play.
- the arrangement of the circumferential groove in the circumferential region of the motor housing achieves a high level in interaction with the ring flange Load capacity.
- the fastening sleeve and ring flange together form a labyrinth seal, which increases the covering protective function for the vibration damper.
- the handle holder has at least one radially inwardly directed securing projection, which engages with play in a securing receptacle of the fastening sleeve.
- the position of the handle housing relative to the motor housing is achieved indirectly through direct interaction between the handle holder and the fastening sleeve.
- the vibration damper can be arranged in a ring with a maximum radius to the longitudinal axis of the device in the area of the outer contour of the motor housing and handle housing.
- the securing projection together with a radial damping section of the damping sleeve is guided into the securing receptacle from the outside in, the radial damping section filling the play between the securing projection and the securing receptacle. It is therefore not a completely free game, but a game that is permitted by the elastic deformation of the radially inwardly projecting damping section. Gaps, cavities or the like , in which dirt could get in the way of preventing movement.
- an especially circumferential gap is provided between the handle holder and the motor housing in the axial direction, from which an abutting edge of the damping sleeve protrudes radially beyond the contour of the handle holder and the motor housing.
- the damping sleeve performs a multiple function.
- the ' rubber-elastic, soft material of the damping sleeve reduces the device load in the area of the butt edge with external shock or impact loads.
- the non-slip haptic properties of the damper material increase the grip of the device housing.
- the abutting edge also acts as a seal in the circumferential gap between the motor housing and the handle housing, so that the penetration of dirt and moisture is effectively avoided.
- the damping sleeve has an axial damping section which lies in the axial direction between an end face of the holder and an end face assigned to the motor housing.
- a section is also created which is exposed to tensile and compressive stresses. It is an elevated one Number of degrees of freedom given for constructive adaptation of the vibration and damping behavior.
- the damping sleeve and the handle holder and / or the damping sleeve and the fastening sleeve are designed in one piece as a two-component injection-molded component.
- positional tolerances between the individual components are avoided.
- Clearly defined contact surfaces between the individual components can be specified precisely in terms of design and remain constant over a long operating period due to the avoidance of the ingress of dirt and moisture. Breakthroughs in a sleeve section of the handle holder and / or the fastening sleeve are expedient from
- the structural unit consisting of the handle holder and the damping sleeve is designed in the form of two half-shells firmly connected to one another.
- a parting plane of the two half-shells is arranged at an angle with respect to the axial direction, in particular at 90 ° to a parting plane of two housing shells of the motor housing.
- the twisted arrangement of the two parting planes relative to one another allows the use of the two half shells as a connecting element for the two housing shells of the motor housing.
- the assembly effort is reduced. Worn vibration dampers can be replaced by simply replacing the half-shell replace len.
- the two half-shells are expediently connected to one another by screwing or by pushing on an external, circumferential clamping ring.
- Fig. 2 is an exploded perspective view of a
- Fig. 3 shows the detail III of FIG. 1 with details of
- FIG. 4 shows an exploded view of a further exemplary embodiment of the invention with a vibration damper in the form of two separate half-shells and a position securing device on the fastening sleeve assigned to the motor housing;
- Fig. 6 shows a variant of the arrangement according to FIG. 4 with screwed half shells of the vibration damper
- FIG. 7 shows a sectional illustration of the arrangement according to FIG. 6 in the area of the vibration damper with details of an additional impact edge molded on in one piece.
- Fig. 1 shows a partially sectioned side view of a hand tool according to the invention using the example of a cut-off machine.
- An electric motor (not shown in more detail) is arranged in a motor housing 1 of the machine tool and drives a work tool using a cutting disk 32 as an example, via an angular gear (also not shown) arranged in a gear housing 30.
- the cutting disc 32 is held on a tool shaft 31 which is driven to rotate about an axis of rotation 33, the axis of rotation 33 being approximately at right angles to a longitudinal axis 29 of the approximately cylindrical, here slightly conical motor housing 1.
- a handle housing 3 is arranged on the front side of the motor housing 1 opposite the gear housing 30, which can accommodate various operating elements for the drive motor and forms a rear handle of the machine tool.
- the drive motor and the cutting disc 32 generate vibrations, which are transmitted to the motor housing 1 and components held thereon.
- a elastic vibration damper 2 attached to the motor housing 1.
- the rubber-elastic vibration damper 2 allows a swinging relative movement of the motor housing 1 relative to the handle housing 3. Its elastic flexibility is designed in such a way that the vibrations are only transmitted to the handle 3 in a significantly reduced manner.
- the relative position of the handle housing 3 relative to the motor housing 1 defines an axial direction 7 which, in the exemplary embodiment shown, lies approximately parallel to the longitudinal axis 29 of the motor housing 1.
- the handle housing 3 overlaps the vibration damper 2 in the axial direction 7 in the direction of the motor housing 1 and is directly on the motor housing with play
- the vibration damper 2 is comparable to one in the
- the vibration damper 2 is composed of a fastening sleeve 4 assigned to the motor housing 1, an elastic damping sleeve 5 coaxially encompassing the fastening sleeve 4 and a fastening element likewise coaxial. supply sleeve 4 and the damping sleeve 5 encompassing the handle housing 3 assigned handle holder 6.
- the coaxial structure is selected such that the fastening sleeve 4 and the handle holder 6 with the damping sleeve 5 in between are constructed in layers radially from the inside to the outside.
- the handle housing 3 is firmly connected to the handle holder 6 and forms together with this a structural unit which is essentially rigid overall with respect to the elasticity of the damping sleeve.
- the vibration-isolating and vibration-damping relative movement between the two components is essentially limited to the deformation of the damping sleeve 5.
- angle grinder instead of the angle grinder shown here, other comparable handheld power tools, in particular with an electric motor drive such as drills or the like, can also be used. , be provided.
- FIG. 2 shows an exploded view of an individual housing shell 26 of the motor housing 1 according to FIG. 1 in the area of the vibration damper 2.
- An opposite housing shell, not shown here, is constructed approximately mirror-symmetrically according to the same principle and complements the assembly with the half shell 26 shown here to the motor housing 1 with the integrally formed vibration damper 2. It can be seen that the fastening sleeve 4 is made in one piece with the motor housing 1. A two-part construction can also be expedient.
- a radially outwardly open, circumferential circumferential groove 8 is arranged between the fastening sleeve 4 and the motor housing 1, which in the axial direction 7 towards the motor housing 1 through an end wall 35 and in the opposite direction to the fastening sleeve 4 through a circumferential one , outer ring flange 34 is limited.
- the handle holder 6 comprises a cylindrical sleeve section 19, which is adjoined on the end face on the side facing away from the motor housing 1 by a radially outwardly rising, circumferential outer ring flange 36.
- the fastening sleeve 4 and the sleeve section 19 of the handle holder 6 are provided with a number of openings 20, 21. 1 and 3, the damping sleeve 5, the handle holder 6 and the fastening sleeve 4 are made in one piece as a two-component injection-molded component, the sleeve section 19 of the handle holder 6 and the fastening sleeve 4 being radial on both sides of the material the damping sleeve 5 are enclosed.
- the material of the damping sleeve 5 penetrates the openings 20, 21, whereby an intimate, positive connection of the damping sleeve 5 with the fastening sleeve 4 and the handle holder 6 is brought about.
- the housing shell 26 shown is listed in one piece with an assigned half shell of the vibration damper 2 as a two-component injection molded component. It can also be expedient, with a corresponding geometric design, to attach the fastening sleeve 4, the damping to produce sleeve 5 and the handle holder 6 as separate parts.
- Fig. 3 shows an enlarged view of the detail III of FIG. 1 with the motor housing 1 shown in Fig. 2 and the vibration damper 2 also shown there in the assembled state. Accordingly, it can be seen that the damping sleeve 5 is formed as S-shaped in cross-section, the 'fixing sleeve 4 is completely enclosed in the radial direction inside and outside the material of the damping sleeve. 5 The same also applies to the sleeve section 19 of the handle holder 6, the larger material cross section of the damping sleeve 5 lying in the radial direction between the fastening sleeve 4 and the handle holder 6 in order to produce the required elastic resilience.
- the outer ring flange 34 and the sleeve section 19 of the handle holder 6 are at a distance from each other, facing end faces 18, 17, between which there is a one-piece molded axial damping section 16 of the damping sleeve 5, and for receiving compressive stresses running in the axial direction 7 is provided.
- the outer ring flange 36 of the handle holder 6 projects in the radial direction beyond the material of the damping sleeve 5 and engages in an inner ring groove 37 of the handle housing 3 without play.
- the handle holder 6 is designed separately from the handle housing 3.
- the play-free engagement of the outer ring flange 36 in the inner ring groove 37 creates an essentially rigid and immovable connection between the handle housing 3 and the handle holder 6.
- the handle housing 3 carries, on its front end facing the motor housing 1, on the inside of its circumferential wall shown in section, a radially inwardly directed circumferential ring flange 9, which with free play in the peripheral groove 8 of the motor housing 1 intervenes.
- the annular flange 9 is located at a radial distance from the bottom of the circumferential groove 8 and at an axial distance from the end wall 35 and from the outer ring flange 34.
- the radially inwardly directed annular flange 9 engages so deeply in the circumferential groove 8 that it is related to the axial direction 7 lies in overlap with the outer ring flange 34 of the motor housing 1.
- the axial and radial play between the ring flange 9 and the circumferential groove 8 allows a freely oscillating relative movement of the assembly from the motor housing 1 and the fastening sleeve 4 relative to the assembly from the handle housing 3 and the handle holder 6.
- the handle housing 3 is secured directly on the motor housing 1 against detachment by the ring flange 9 engages positively with play in the circumferential groove 8.
- FIG. 4 shows a further exemplary embodiment of the invention, in which a motor housing 1 shown in perspective corresponding to the illustration according to FIG. 1 and a vibration damper 2 comprising two half-shells 22, 23 are provided.
- the motor housing 1 consists of two housing shells 26, 27.
- a dividing line 41 indicates a division plane 25, shown in more detail in FIG. 5, between the two housing shells 26, 27.
- a radially outwardly rising annular flange 38, 39 is provided on both sides of the fastening sleeve 4.
- the fastening sleeve 4 is provided at two diametrically opposite points with a securing receptacle 11 in the form of an open opening.
- the two half shells 22, 23 of the vibration damper 2 are made separately from the motor housing 1, between which a division plane 24 lies.
- the two half-shells 22, 23 are each made in one piece as a two-component injection-molded component separately from the handle housing 3 (FIG. 1) and from the motor housing 1 and comprise half-shells of the damping sleeve 5 and the handle holder 6.
- the damping sleeve 5 and the handle holder 6 can also be made separately from each other in the form of individual half-shells.
- Both half-shells 22, 23 are provided centrally on their inside with a radially inwardly rising securing projection 10 which engages in the associated securing receptacle 11 of the fastening sleeve 4 in the assembled state.
- a circumferential approximately cylindrical clamping ring 28 is provided, which in the assembled state comes to rest on an associated circumferential cylindrical outer surface 40 of the two half-shells 2, 23.
- Fig. 5 shows a longitudinal sectional view of the arrangement of FIG. 4 in the assembled state.
- the two diametrically opposed locking projections 10 of the sleeve-shaped handle holder 6 are directed radially inwards and engage with play in the respectively assigned locking receptacle 11 of the fastening sleeve 4 from the outside inwards.
- a free radial and axial play between the securing projection 10 and the securing receptacle 11 can also be expedient here.
- the two securing projections 10 are passed through the securing receptacle 11 from the outside inwards together with a radial damping section of the damping sleeve 5.
- the radially inwardly rising damping section 12 of the damping sleeve 5 completely surrounds the securing projection 10 and projects together with it into the interior of the fastening sleeve 4.
- the radial damping section 12 fills the play between the securing projection 10 and the securing receptacle 11 and, due to its elastic flexibility, allows the rigid assembly from the motor housing 1 and the fastening sleeve 4 to move relative to the rigid assembly from the handle housing 3 CFIg, not shown here i) de ⁇ nd m handle holder 6 to.
- the engagement of the securing projection 10 in the securing receptacle 11, which extends in the radial direction, causes a positive engagement with play, which secures the unit from the handle housing 3 (FIG. 1) and the handle holder 6 on the unit from the motor housing 1 and the fastening sleeve 4 against detachment when the damping sleeve 5 fails.
- a circumferential gap 13 is provided between the handle holder 6 and the motor housing 1, which gap is filled by the one-piece molded material of the rubber-elastic damping sleeve 5.
- the material of the damping sleeve 5 is shaped in such a way that a circumferential abutting edge 14 which is rounded and has a cross section is formed which protrudes beyond the contour of the handle holder 6 and the motor housing 1.
- this also forms an axial damping section 16 of the damping sleeve 5, which resiliently lies between end faces 17, 18 of the motor housing 1 or the handle holder 6.
- An outer surface of the clamping ring 28 is approximately aligned with an outer surface of the motor housing 1 and the handle housing 3 (FIG. 1) and can also serve as a gripping surface for the user.
- a suitable surface structure or non-slip coating of the outer surface of the clamping ring 28 can be expedient.
- the handle housing 3 runs with its inner annular groove 37 (FIG. 3) rotatable about the longitudinal axis 29 on the outer ring flange 36 shown here Locking the selected rotational position a number of notches 45 is formed in the free end face of the handle holder 6.
- FIGS. 4 and 5 corresponds to that according to FIGS. 1 to 3.
- FIGS. 4 and 5 show a variant of the arrangement according to FIGS. 4 and 5, so that the two half-shells 22, 23 are screwed together.
- the exploded view according to FIG. 6 shows that the two half-shells 22, 23 are constructed to be rotationally symmetrical to one another and each have a hollow pin 42 and a bore 43 on their mutually facing end faces. In the assembled state, the respective hollow pin 42 engages in the opposite bore 43.
- a screw 44 is inserted tangentially from the outside inwards into the two bores 43 and screwed into the hollow pin 42, as a result of which the two half-shells 22, 23 are firmly connected to one another and to the motor housing 1.
- the longitudinal sectional view according to FIG. 7 also shows that in addition to the abutting edge 14 in the gap 13 between the motor housing 1 and the vibration damper 2, another abutting edge 15 is provided, which is made in one piece and with the same material as the damping sleeve 5 of the vibration damper 2.
- the butt edge 15 protrudes outward in the radial direction beyond the contour of the handle holder 6 and runs on the outside of the cylindrical outer surface 40 around the handle holder 6.
- the exemplary embodiment according to FIGS. 6 and 7 corresponds to that according to FIGS. 4 and 5.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Motor Or Generator Frames (AREA)
- Vibration Dampers (AREA)
- Percussive Tools And Related Accessories (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2005/011601 WO2007048435A1 (en) | 2005-10-29 | 2005-10-29 | Portable power tool |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1940594A1 true EP1940594A1 (en) | 2008-07-09 |
EP1940594B1 EP1940594B1 (en) | 2009-07-08 |
Family
ID=36593634
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05806448A Active EP1940594B1 (en) | 2005-10-29 | 2005-10-29 | Portable power tool |
Country Status (5)
Country | Link |
---|---|
US (1) | US8496073B2 (en) |
EP (1) | EP1940594B1 (en) |
CN (1) | CN101282822B (en) |
DE (1) | DE502005007679D1 (en) |
WO (1) | WO2007048435A1 (en) |
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DE102007030703A1 (en) | 2007-07-02 | 2009-01-08 | Robert Bosch Gmbh | Elastic connection between housing parts of motor-driven machine tools |
ITMI20080407U1 (en) | 2008-12-11 | 2010-06-12 | Valentini Guido | HANDLE FOR PNEUMATIC MACHINES FOR SURFACE MACHINING |
DE102009002975A1 (en) * | 2009-05-11 | 2010-11-18 | Robert Bosch Gmbh | Hand tool machine, in particular electric hand tool machine |
WO2011060512A1 (en) * | 2009-10-15 | 2011-05-26 | Sparky Eltos Ad | Anti-vibration handle for electric machine tools |
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DE102012103604A1 (en) * | 2012-04-24 | 2013-10-24 | C. & E. Fein Gmbh | Handleable machine tool with housing |
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CN105500296A (en) * | 2015-12-31 | 2016-04-20 | 宁波中旺工具有限公司 | Electric screw driver with vibration reduction separating piece |
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2005
- 2005-10-29 US US12/091,649 patent/US8496073B2/en not_active Expired - Fee Related
- 2005-10-29 CN CN2005800517996A patent/CN101282822B/en not_active Expired - Fee Related
- 2005-10-29 DE DE502005007679T patent/DE502005007679D1/en active Active
- 2005-10-29 WO PCT/EP2005/011601 patent/WO2007048435A1/en active Application Filing
- 2005-10-29 EP EP05806448A patent/EP1940594B1/en active Active
Non-Patent Citations (1)
Title |
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See references of WO2007048435A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP1940594B1 (en) | 2009-07-08 |
WO2007048435A1 (en) | 2007-05-03 |
US20080223594A1 (en) | 2008-09-18 |
CN101282822A (en) | 2008-10-08 |
CN101282822B (en) | 2010-05-12 |
US8496073B2 (en) | 2013-07-30 |
DE502005007679D1 (en) | 2009-08-20 |
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