EP2181810A1 - Outil électrique à vibrations amorties - Google Patents

Outil électrique à vibrations amorties Download PDF

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Publication number
EP2181810A1
EP2181810A1 EP08167924A EP08167924A EP2181810A1 EP 2181810 A1 EP2181810 A1 EP 2181810A1 EP 08167924 A EP08167924 A EP 08167924A EP 08167924 A EP08167924 A EP 08167924A EP 2181810 A1 EP2181810 A1 EP 2181810A1
Authority
EP
European Patent Office
Prior art keywords
handle
power tool
housing
side portion
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.)
Withdrawn
Application number
EP08167924A
Other languages
German (de)
English (en)
Inventor
Horst Fahrner
Markus Männel
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.)
Techtronic Industries GmbH
Original Assignee
AEG Electric Tools 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 AEG Electric Tools GmbH filed Critical AEG Electric Tools GmbH
Priority to EP08167924A priority Critical patent/EP2181810A1/fr
Publication of EP2181810A1 publication Critical patent/EP2181810A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/04—Handles; Handle mountings
    • B25D17/043—Handles resiliently mounted relative to the hammer housing
    • 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
    • B25F5/008—Cooling means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2222/00—Materials of the tool or the workpiece
    • B25D2222/54—Plastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2222/00—Materials of the tool or the workpiece
    • B25D2222/54—Plastics
    • B25D2222/57—Elastomers, e.g. rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2222/00—Materials of the tool or the workpiece
    • B25D2222/54—Plastics
    • B25D2222/61—Polyamides, e.g. Nylon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2222/00—Materials of the tool or the workpiece
    • B25D2222/54—Plastics
    • B25D2222/66—Polypropylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/085—Elastic behaviour of tool components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/121—Housing details

Definitions

  • the invention relates to a power tool, in particular a drill and chisel, with a housing and a handle having a handle portion and a side portion attached to the housing, for damping vibrations of the power tool when guiding the power tool by a user.
  • a power tool according to the above technical field is already known from DE 10 2007 001 591 known.
  • the power tool which may be in particular a drill or chisel hammer, has a substantially U-shaped bow handle in the rear area, ie on the tool (eg drill or chisel) opposite or opposite end of the power tool, with two legs of the " U "substantially parallel to each other point towards the housing of the power tool and are connected thereto. So far, at least one leg of the U-shaped handle is resiliently connected to the housing to reduce vibrations, so that strong shocks that occur during operation of the power tool, not directly transmitted to the user but are cushioned by the handle.
  • a coil spring is housed, the axial forces along a vibration axis of the power tool, so for example, the axis along which moves the bit of a chisel hammer, or cushion such movements.
  • the lower leg of the handle is pivotally attached to the housing of the power tool.
  • a hinge or a hinge is used as a connection between the lower leg of the handle and the housing.
  • Such a hinge allows rotation of the handle about the axis of the hinge and thus substantially axial movement of the upper leg of the handle along the suspension axis of the coil spring.
  • the hinge is needed to ensure the structural strength of the handle on the power tool.
  • the handle is thus mounted on both parallel legs on the power tool, wherein at one mounting location, an axial suspension is provided and at the other mounting location is a rotationally movable attachment of the handle.
  • Another known from the prior art embodiment uses a type of hinge joint instead of a rotary joint, with which the lower leg of the U-shaped strap handle is bonded to the housing and pivotable relative to the housing.
  • the damping suspension is still effected by a corresponding coil spring at the other mounting location, namely in the upper leg of the handle.
  • the object of the present invention is therefore to provide a power tool of the above-mentioned technical field, which requires compared to the prior art fewer components and at the same time provides a high vibration damping.
  • the power tool is characterized in that the handle is resiliently secured to the housing by the side portion.
  • the side portion which corresponds to a leg of the handle in a substantially U-shaped strap handle, is formed of such a material and dimensioned so that an elastic bending under application of a damping force is possible. This means that the side portion is forced to spring back by a backward movement of the power tool and a correspondingly directed force, for example, by a kickback of a drill or chisel, in conjunction with the counterforce exerted by the user on the handle.
  • the elasticity (spring constant) of the side section preferably corresponds approximately to the elasticity of a helical spring mounted in an upper leg, so that the damping effect of the handle is comparable to the damping effect of the abovementioned devices known from the prior art.
  • the attachment of the handle via the side portion to the housing thus constitutes integral structural attachment of the handle and at the same time a vibration damping for the handle, which requires no further damping element or fastener.
  • the side portion is therefore angled significantly away from the handle portion and can be used in this way particularly well by bending as a damping element for vibration damping.
  • a spring force is generated, which is directed against the bending movement and thus serves for the damping of transmitted to the handle vibrations of the power tool.
  • the handle is a U-shaped strap handle, wherein the handle portion connects the side portion and a rim portion, wherein the rim portion and the housing are separated by a gap between each other and wherein the edge portion is preferably guided by a guide means on the housing.
  • the handle may also be made substantially L-shaped.
  • the edge portion preferably extends parallel to the side portion in the U-shaped embodiment and, when the side portion is a first side leg of the U-shaped handle, the other of the two such side legs of the handle. The edge portion is thus attached only as part of the handle on the handle portion and thus on the side portion of the housing.
  • the gap between the edge portion and the housing thus represents a possibility that the handle can move freely in the direction of the housing along the distance of the gap.
  • the gap is an area in which there is no structurally fastening connection between the edge section and the housing of the power tool.
  • a sheathing of the gap by a panel, a guide of the edge portion or the like is not excluded by this.
  • Such a panel or guide can form a guide device along which the handle is guided.
  • Such a guide device may, for example, be a housing surrounding the edge section, in which the edge section can slide in the direction of the gap. Characterized in that the edge portion is guided only in the guide means, slides in it, but undergoes no structural attachment, serving as a guide device component can be carried out according to easily.
  • the side portion can be attached according to the invention, for example, by screws, rivets or other fastening means to the housing.
  • the side portion is made integral with the housing part.
  • the housing and the handle can be cast, for example in the form of two half-shells, which are then assembled.
  • the handle is considered to be integral with the housing, because the parts to be assembled in each case comprise both parts of the handle and of the housing.
  • the side section is made of a plastic.
  • This plastic may be a conventional elastic plastic, for example, a thermoplastic such as polyolefin, polypropylene, polystyrene and its copolymers, polyamide and many other engineering plastics. Such plastics are particularly suitable for injection molding.
  • the handle has at least one operating element for operating the power tool, in particular an operating switch, pushbutton or controller.
  • Corresponding operating elements are preferably suitable for the operation, i. to control or regulate a start of operation as well as an end of operation and an operating speed, etc.
  • the power tool is particularly comfortable to use, as well as the damped handle may have such control.
  • the grip portion has a softer surface than that of the side portion, in particular a rubber surface.
  • a corresponding coating of the handle portion provides a pleasant feel of the handle.
  • the side portion is attached to a remote from a vibration axis, preferably a spaced by at least 10cm from the axis of vibration point on the housing of the power tool.
  • the side portion may for example form the lower leg of the handle, which is mounted at a position on the housing, which is not in extension of the vibration axis, wherein the vibration axis by the resulting vibrations, For example, is defined by a chisel operation of the power tool.
  • On the vibration axis is for example the tool, which is operated by the power tool, such as a chisel or a drill.
  • a particularly preferred minimum of this spacing of 10 cm corresponds approximately to a minimum length of the handle portion, so that it can be fully grasped by an adult hand.
  • the grip portion preferably extends from the side portion toward the vibration axis. Accordingly, in a preferred embodiment of the power tool having a side portion spaced from the vibration axis, the grip portion is preferably disposed on the vibration axis side of the side portion. If the grip portion is preferably in extension of the vibration axis or at least comes close, the power tool can be particularly efficient, accurate and secure lead and exert a particularly safe exercise of force by the user to the power tool, for example in the case of a drill or chisel.
  • the extension ie the longitudinal extent of the side portion extends substantially parallel, ie in an angular interval of up to 15 ° to one or the vibration axis.
  • a particularly good axial damping is achieved along the axis of vibration, because this leads to efficient bending of the side portion in holding the handle during the formation of the vibrations, the damping of the Handle essentially makes.
  • the side portion is adapted to pivot at an angle of at least 3 °, preferably at least 5 ° elastically.
  • the side portion is arranged to pivot at an angle of up to 10 °.
  • a ribbed structure preferably filled with a rubber material, which allows a wide elastic pivoting range and at the same time provides sufficient elasticity, ie. provides a sufficiently large spring constant.
  • the rib structure which is preferably filled with a rubber material, so it is a particular embodiment of the side portion.
  • the ribs of the structure thereby run substantially perpendicular to the expansion, i. the longitudinal extent of the side portion and are in the direction of expansion, i. the longitudinal extent spaced from each other.
  • the filling with rubber material is for visual and haptic purposes, because the side portion can be given in this way an elastic impression.
  • a power tool is created that requires fewer components compared to the prior art and at the same time provides high vibration damping.
  • Fig. 1 shows a partially sectioned side view of a power tool 10 with a housing 12 and a handle 14, wherein the housing 12 and the handle 14 are integrally formed and in Fig. 1 are shown cut.
  • the power tool 10 is a hammer drill having a drilling axis substantially horizontally oriented in its upright orientation along which vibration occurs during operation.
  • the coincident with the drilling axis vibration axis 34 is therefore also substantially aligned horizontally, that is subject to an angular deviation of at most 15 ° relative to the horizontal.
  • the motor housing 12 which houses a motor, a gearbox and other peripherals of the hammer drill.
  • the housing 12 thus extends in the upright, in Fig. 1 shown orientation of the hammer drill 10 substantially vertically from the vibration axis 34 downwards, ie at an angle of between 70 ° and 110 ° relative to the drilling axis.
  • the handle 14 At the lower end of the housing 12, it is integrally connected to the handle 14.
  • the handle 14 in this case comprises a handle portion 16 and a side portion 18 and a rim portion 24, wherein the handle portion 16 is substantially parallel to the orientation of the housing 12, that is substantially vertically along the handle axis 20, which is analogous to the housing 12th in an angular range of between 70 ° and 110 ° to the drilling axis.
  • the side portion 18 extends in the direction of a side portion axis 22 which is also substantially perpendicular to the handle axis 20, that is arranged at an angle of between 70 ° and 110 °.
  • an air guide element 19 Integral with the side portion 18, an air guide element 19 is formed.
  • This air guide element 19 allows a targeted guidance of cooling air through vents 17 to the motor of the power tool and also improves the stability and at the same time the elasticity of the side portion 18 by being shaped and formed so that the corresponding properties of the side portion 18 are variable.
  • the vibration damping of the handle 14 is adjustable.
  • the side portion 18 is dimensioned and shaped such that the handle 14 is resiliently secured to the housing 12.
  • FIG. 1 also clearly shows an arcuate concavity or sidecut in the side portion 18 which is provided with soft plastic or rubber material 21 and a rib structure 23.
  • On the inner surface of the side portion 18 is this provided with the ventilation slots 17.
  • the side portion 18 is thus deliberately weakened, whereby one of the in Fig. 1 Represented deviant realization of the weakening is possible, for example by other form weakening or by introducing a relatively weak material.
  • An example of a deviant realization of the weakening is in FIG. 2 shown.
  • the side portion 18 of the handle 14 together with the handle portion 16 is substantially L-shaped, with the rim portion 24 attached to the handle portion 16 on the side of the handle portion 16 opposite the side portion 18.
  • the edge portion 24 forms, together with the handle portion 16 and the side portion 18 has a substantially U-shaped handle 14 which is integrally attached to the lower portion of the side portion 18 on the housing 12.
  • the side portion 18 allows on the one hand a relative movement between the handle portion 16 of the handle 14 and the housing 12, on the other hand exerts the side portion 18 a defined, the deflection of the handle portion 16 relative to the housing 12 proportional and its counteracting force, which leads to the damping of vibrations.
  • the side portion 18 thus assumes both the function of a used in conventional corresponding power tools hinge on the lower leg of the handle 14 and the function of a damper spring, the conventional power tools, usually in or on the upper leg of the handle, in analog or in the edge portion 24 of shown power tool is arranged.
  • the edge portion 24 has a guide projection 30 or pin which is provided with a guide 38 on the housing 12 of the power tool, more precisely with a slot guide 28th cooperates in the guide member 38.
  • a gap 26 between the edge portion 24 and the housing 12 of the power tool according to the invention is not provided with an additional spring element and not with a structural support member, such as a hinge.
  • an elastic stop can be attached in the front region of the gap 26 facing the tool, in order to still achieve a certain degree of damping in the case of a particularly strong contact pressure.
  • the edge portion 24 is guided in the preferred embodiment shown here by the guide member 38 along the direction of the slot guide 28. This direction is substantially parallel to the vibration axis 34.
  • the guide member 38 are two parallel slots 28, of which Fig. 1 a slot 28 is shown.
  • the respective guide projection 30 or pin of the edge portion 24 of the handle 14 is placed so that the handle 14 is slidable along the slot 28 and blocked from movement in other directions.
  • Fig. 2 shows a slight of the in Fig. 1 Represented deviant rotary hammer in a perspective exploded view.
  • the housing 12 is in Fig. 2 shown as consisting of two housing halves 12.1, 12.2. Analogous to the two housing halves 12.1 and 12.2 and the handle 14.1, 14.2 is shown in two parts with its sections.
  • the assembled to the housing 12 housing parts 12.1, 12.2 enclose the drive unit 36 for the hammer drill in the assembled state, and the handle portion 14.1, 14.2 join together to form an integral handle 14 which is integral with the housing 12 and secured thereto.
  • Fig. 2 again shows the guide element 38 with the oblong holes 28, in which the guide projections 30, of which in Fig.
  • Fig. 2 is, in contrast to Fig. 1 , another, wavy configuration of the side portion 18 in the region of the concavity at the side portion of the power tool Fig. 1 to recognize.
  • This corrugated embodiment also provides additional elasticity of the side portion 18.
  • integrally formed with the side portion 18, the air guide member 19 described above, from the in Fig. 2 the part 19.1 of the side portion part 18.1 is shown.
  • FIGS. 3A and 3B show a section of the hammer from the FIGS. 1 and 2 , The figures show the gap 26 between the edge portion 24 of the handle 14 and the housing 12 of the power tool.
  • FIG. 3A shows a rebounded state of the handle 14, in which the guide projection 30 of the edge portion 24 in the slot 28 of the guide member 38 at the rear end of the slot 28, ie at the end, which is opposite to the handle 14, rests.
  • FIG. 3B to recognize that the handle 14 is compressed in the direction of the power tool housing.
  • FIG. 3A shows FIG. 3B that instead of the gap 26, the in FIG. 3B is substantially no longer recognizable, almost a contact between the edge portion 24 and the housing of the power tool is made.
  • someone specific Residual gap 26 is, however, also in the in FIG. 3B retained by the guide 38 shown by the guide projection 30 of the edge portion 24 of the handle 14 in the slot guide 28 on the front side of the slot 28, ie on the side facing the housing 12 of the power tool, to the Limitation of the slot 28 abuts and is prevented from further deflection.
  • Fig. 3A So shows the maximum rebounded state
  • Fig. 3B represents the maximum spring-loaded state of the handle 14.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
EP08167924A 2008-10-30 2008-10-30 Outil électrique à vibrations amorties Withdrawn EP2181810A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08167924A EP2181810A1 (fr) 2008-10-30 2008-10-30 Outil électrique à vibrations amorties

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08167924A EP2181810A1 (fr) 2008-10-30 2008-10-30 Outil électrique à vibrations amorties

Publications (1)

Publication Number Publication Date
EP2181810A1 true EP2181810A1 (fr) 2010-05-05

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ID=40456264

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08167924A Withdrawn EP2181810A1 (fr) 2008-10-30 2008-10-30 Outil électrique à vibrations amorties

Country Status (1)

Country Link
EP (1) EP2181810A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2415562A3 (fr) * 2010-08-05 2017-12-20 Black & Decker Inc. Poignée arrière
US20180099396A1 (en) * 2016-10-07 2018-04-12 Makita Corporation Power tool
US9993915B2 (en) 2014-01-23 2018-06-12 Black & Decker Inc. Rear handle
US10040184B2 (en) 2014-01-23 2018-08-07 Black & Decker Inc. Rear handle
US10046451B2 (en) 2014-01-23 2018-08-14 Black & Decker Inc. Rear handle
US10137562B2 (en) 2014-01-23 2018-11-27 Black & Decker Inc. Rear handle
EP3778131A1 (fr) * 2019-08-12 2021-02-17 Metabowerke GmbH Boitier pour un appareil outil portatif électrique
DE102022134555A1 (de) 2022-12-22 2024-06-27 Andreas Stihl Ag & Co. Kg Handgeführtes Arbeitsgerät

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE860480C (de) * 1950-12-12 1952-12-22 Hauhinco Maschf Drucklufthammer, bei dem zum Auffangen von Stoessen die Griffhaube mit dem Griffstueck aus Gummi besteht
EP1674210A1 (fr) * 2004-12-21 2006-06-28 HILTI Aktiengesellschaft Outil avec poignée principale mécaniquement découplée
DE102006059348A1 (de) * 2006-12-15 2008-07-03 Robert Bosch Gmbh Handwerkzeugmaschine mit schwingungsentkoppeltem Handgriff
DE102007001591A1 (de) 2007-01-10 2008-07-17 Aeg Electric Tools Gmbh Tragbare, handgeführte Werkzeugmaschine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE860480C (de) * 1950-12-12 1952-12-22 Hauhinco Maschf Drucklufthammer, bei dem zum Auffangen von Stoessen die Griffhaube mit dem Griffstueck aus Gummi besteht
EP1674210A1 (fr) * 2004-12-21 2006-06-28 HILTI Aktiengesellschaft Outil avec poignée principale mécaniquement découplée
DE102006059348A1 (de) * 2006-12-15 2008-07-03 Robert Bosch Gmbh Handwerkzeugmaschine mit schwingungsentkoppeltem Handgriff
DE102007001591A1 (de) 2007-01-10 2008-07-17 Aeg Electric Tools Gmbh Tragbare, handgeführte Werkzeugmaschine

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2415562A3 (fr) * 2010-08-05 2017-12-20 Black & Decker Inc. Poignée arrière
US9993915B2 (en) 2014-01-23 2018-06-12 Black & Decker Inc. Rear handle
US10040184B2 (en) 2014-01-23 2018-08-07 Black & Decker Inc. Rear handle
US10046451B2 (en) 2014-01-23 2018-08-14 Black & Decker Inc. Rear handle
US10137562B2 (en) 2014-01-23 2018-11-27 Black & Decker Inc. Rear handle
US20180099396A1 (en) * 2016-10-07 2018-04-12 Makita Corporation Power tool
US10780564B2 (en) * 2016-10-07 2020-09-22 Makita Corporation Power tool
EP3778131A1 (fr) * 2019-08-12 2021-02-17 Metabowerke GmbH Boitier pour un appareil outil portatif électrique
DE102022134555A1 (de) 2022-12-22 2024-06-27 Andreas Stihl Ag & Co. Kg Handgeführtes Arbeitsgerät

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