EP3043967A1 - Machine-outil portative - Google Patents

Machine-outil portative

Info

Publication number
EP3043967A1
EP3043967A1 EP14758866.9A EP14758866A EP3043967A1 EP 3043967 A1 EP3043967 A1 EP 3043967A1 EP 14758866 A EP14758866 A EP 14758866A EP 3043967 A1 EP3043967 A1 EP 3043967A1
Authority
EP
European Patent Office
Prior art keywords
handle
axis
suspension
working axis
machine housing
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
Application number
EP14758866.9A
Other languages
German (de)
English (en)
Other versions
EP3043967B1 (fr
Inventor
Michael Weber
Stefan Schmid
Markus Holubarsch
Axel Fischer
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.)
Hilti AG
Original Assignee
Hilti AG
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 Hilti AG filed Critical Hilti AG
Priority to EP14758866.9A priority Critical patent/EP3043967B1/fr
Publication of EP3043967A1 publication Critical patent/EP3043967A1/fr
Application granted granted Critical
Publication of EP3043967B1 publication Critical patent/EP3043967B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/24—Damping the reaction force
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/06—Means for driving the impulse member
    • B25D2211/068—Crank-actuated impulse-driving mechanisms
    • 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
    • B25D2250/371—Use of springs

Definitions

  • the present invention relates to a hand tool for drilling, chiselling or combined drilling chiseling tools.
  • the hand tool includes a percussion, before the return of which the user is protected by vibration-damping decoupling between the percussion and a handle.
  • the portable power tool has a tool holder for receiving a chiselling, drilling or drilling chisel tool and a striking mechanism.
  • the percussion mechanism is arranged in a machine housing.
  • a handle is oriented along a tilted to the working axis, inclined by at least 70 degrees or perpendicular handle axis and applied with three suspensions on the machine housing.
  • the first suspension is located closer to the working axis than the second suspension.
  • the third suspension is offset from the first suspension and the second suspension along the working axis, for example offset in the direction of impact.
  • the second suspension has a lever arm extending along the handle axis. The first end of the lever arm is attached to one of the machine housing and handle.
  • a guide is attached to the other of the machine housing and handle.
  • the second end of the lever arm is forced in the guide on a tilted or perpendicular to the working axis path against a spring device deflected.
  • the arrangement of the three suspensions is particularly suitable for a hand tool, the focus is outside the working axis.
  • the first suspension may be located closer to the working axis than the second suspension.
  • the second suspension isolates by means of the guide the vibration damping along the handle axis of a required connection along the working axis.
  • the spring device and the lever arm can be designed independently of each other in order to optimize the vibration damping in the individual directions.
  • One embodiment provides to provide the second end of the lever arm for further decoupling with a pivot bearing.
  • the lever arm may be formed as a leaf spring, which geometrically has a high rigidity along the handle axis and a low rigidity along the working axis.
  • the third suspension has a in a linear guide parallel to the working axis sliding pivot bearing whose axis of rotation is perpendicular to a plane spanned by the working axis and the handle axis.
  • the third suspension allows the handle to move freely for damping the recoil along the working axis.
  • the pivot bearing reduces the transmission of the torque of the power tool around its center of gravity.
  • the guide allows only parallel to the working axis displacement of the machine housing relative to the handle.
  • the rotary bearing complements the translatory degree of freedom of the guide by a rotational degree of freedom, the axis of rotation of the pivot bearing, however, remains within the leadership. Other translational or rotational movements are inhibited by the third suspension.
  • the third suspension can be advantageously arranged at the height of the intermediate racket.
  • the percussion has successively arranged on the working axis in the direction of impact a racket and an intermediate racket.
  • the intermediate bat lies between the bat and the tool.
  • the intermediate beater viewed from the handle, is typically clearly behind the center of gravity along the working axis.
  • Fig. 1 a chisel hammer
  • Fig. 2 a suspension
  • Fig. 3 a suspension
  • Identical or functionally identical elements are indicated by the same reference numerals in the figures, unless stated otherwise.
  • Fig. 1 shows schematically, as an example of a chiseling hand tool machine, a chisel hammer 1.
  • the chisel hammer 1 has a tool holder 2 into which a shank end 3 of a tool, e.g. one of the chisel 4, can be used.
  • a primary drive of the chisel hammer 1 is a motor 5, which drives a percussion 6 and optionally an output shaft.
  • a user can lead the chisel hammer 1 by means of a handle 7 and take the chisel hammer 1 into operation by means of a system switch 8.
  • An additional handle 9 is arranged around or near the tool holder 2.
  • the chisel hammer 1 strikes the chisel 4 continuously in the direction of impact 10 along the working axis 11 into a substrate.
  • the tool holder 2 may additionally be rotationally driven by the motor 5 about the working axis 11.
  • the impact mechanism 6 is, for example, a pneumatic percussion 6.
  • a pathogen 12 and a racket 13 are movably guided in the striking mechanism 6 along the working axis 11 in a guide tube 14.
  • the exciter 12 is coupled via an eccentric 15 or a wobble finger to the motor 5 and forced to a periodic, linear movement.
  • An air spring formed by a pneumatic chamber 16 between exciter 12 and racket 13 couples a movement of the racket 13 to the movement of the exciter 12 at.
  • the racket 13 transmits a portion of its momentum to the drill bit 4 indirectly via an intermediate racket 17 resting substantially during operation.
  • the motor 5, hammer mechanism 6 and other drive components of the chipping hammer 1 are arranged in a cohesive, one-piece or multi-piece machine housing 18.
  • a center of gravity 19 of the machine housing 18 with the drive components 5, 6 is due to the off-axis arrangement of the motor 5 outside the working axis 11 on the side of the motor 5.
  • a motor shaft 20 is located outside the working axis 11, the two axes 11, 20 span a plane, hereinafter main plane on.
  • the two axes 11, 20 may be inclined to each other, for example, be vertical.
  • the handle 7 has a grip rod 21 to be gripped, whose axis 22 (handle axis) is largely perpendicular to the working axis 11.
  • the handle axis 22 is preferably in the main plane with the working axis 11 and the motor axis 20.
  • the handle bar 21 is arranged in the direction of impact 10 in front of the impact mechanism 6.
  • the working axis 11 passes through the handle bar 21, so that the user can thus initiate a contact force on the working axis 11 in the chisel hammer 1 in the chisel 4.
  • the handle bar 21 may be arranged asymmetrically with respect to the working axis 11.
  • a center of the handle bar 21 is displaced along the handle axis 22 of the working axis 11 in the direction of the center of gravity 19.
  • the center can lie along the handle axis 22 at the height of the center of gravity 19.
  • the handle bar 21 may have an ergonomic surface adapted to the palm.
  • the exemplary handle 7 has a housing shell 23.
  • the housing shell 23 encloses the entire machine housing 18, apart from an opening for the tool holder 2 and possibly smaller apertures for controls and ventilation openings.
  • the handle 7 is attached to the machine housing 18 with three suspensions 24, 25, 26.
  • the three suspensions 24, 25, 26 allow the machine housing 18 to be guided by means of the handle 7.
  • the suspensions 24, 25, 26 impart the movements in the main plane from the machine housing 18 to the handle 7, and vice versa.
  • a movement perpendicular to the main plane is preferably inhibited by one of the suspensions 24, 25, 26 or to the main plane parallel, mutually contacting surfaces of the machine housing 18 and handle 7.
  • the first suspension 24 is disposed near the working axis 11. In the exemplary embodiment, the first suspension 24 is on the side facing away from the center of gravity 19 side of the working axis 11.
  • the first suspension 24 is preferably arranged in the direction of impact 10 in front of the machine housing 18.
  • the first suspension 24 preferably has a pure force coupling, at least in the planes parallel to the main plane.
  • the handle 7 is movable in the first suspension 24 along the working axis 11 relative to the machine housing 18. Stops 27, 28 in and against the direction of impact 10 limit the movement to a lifting height 29.
  • the handle 7 can also move along the handle axis 22 in the first suspension 24 relative to the machine housing 18.
  • the first suspension 24 includes a spring element 30, which imparts a contact force parallel to the working axis 11 between the handle 7 and the machine housing 18.
  • a coil spring oriented parallel to the working axis 11 between the machine housing 18 and the handle 7 to be clamped.
  • the coil spring is preferred for transmitting the high contact pressure.
  • the spring element 30 may be composed of a plurality of parallel oriented coil springs.
  • the exemplary coil spring is fixed at one end along the handle axis 22, here along the working axis 11 on the machine housing 18 supporting end. The other end, here the at the handle 7 supporting end, can slide along the handle axis 22 Alternatively, the coil spring can be fixed at both ends, this transverse stiffness should be chosen low due to the selected spring geometry relative to the longitudinal stiffness of the coil spring.
  • the spring element 30 and the first suspension 24 may preferably provide only a small force along the handle axis 22 compared to a force along the working axis 11.
  • the spring stiffness of the exemplary coil spring transverse to the working axis 11 is at least an order of magnitude less than its spring stiffness along the working axis 11.
  • the spring element 30 may be provided with a bias along the working axis 11 such that the handle 7 is pressed against the direction of impact 10 of the machine housing 18.
  • the second suspension 25 is arranged offset along the handle axis 22 relative to the first suspension 24.
  • the second suspension 25 is on the side of the working axle 11 facing away from the center of gravity 19.
  • the second suspension 25 preferably has a pure force coupling, at least in the planes parallel to the main plane.
  • the second suspension 25 imparts a transverse force perpendicular to the working axis 11 between the handle 7 and the machine housing 18.
  • the second suspension 25 can apply a force parallel to the working axis 11 between the Exercise machine housing 18 and the handle 7 and convey.
  • the second suspension 25 is preferably arranged in the direction of impact 10 in front of the machine housing 18.
  • the second suspension 25 includes a lever arm 31, the first end 32 of which is rigidly secured to the handle 7 and the second end 33 of which is movably suspended in a guide 34 along a track.
  • the guide 34 is fixed to the machine housing 18.
  • the second suspension 25 can also be fixed to the guide housing 34 on the handle 7 and the first end 31 of the lever arm 31 on the machine housing 18.
  • the lever arm 31 is oriented substantially along the handle axis 22.
  • the lever arm 31 is e.g. tilted between 70 degrees and 90 degrees with respect to the working axis 11.
  • the attached to the handle 7, here first end 32 is disposed closer to the working axis 11 than the second end 33.
  • the lever arm 31 is preferably formed as a leaf spring.
  • the lever arm 31 is almost stiff in a direction parallel to the handle axis 22, so under pressure and tensile load.
  • the lever arm 31 is elastically yielding parallel to the working axis 11, ie at a bending load.
  • the track 36 of the guide 34 is for example rectilinear and inclined relative to the working axis 11.
  • the inclination of the guide 34 with respect to the axis 22 is between 45 degrees and 90 degrees, for example between 70 degrees and 90 degrees.
  • the web can be straight as illustrated.
  • a curved track 36 may be advantageous in order to obtain the right angle between the working axis 3 and the handle axis 22 as possible during spring movements by the feed force and by the dynamic deflections.
  • the guide 34 has a carriage 37 whose outer dimension perpendicular to the track 36 is equal to the inner dimension 38 of the guide 34.
  • the suspended end 33 may be pivotally suspended in the guide 34 about an axis of rotation 39 extending through the end 33 and perpendicular to the main plane.
  • the carriage 37 is provided with a pivot bearing 40 to which the end 33 is rotatably suspended.
  • the second suspension 25 may include a spring means 41 which provides a restoring force against deflection of the guided end 33 from a home position.
  • the spring device 41 may, for example, springs made of an elastomer 42, foam, leaf springs or coil springs included.
  • the use of progressive spring elements has the advantage that at high forces along the handle axis 22, the function is fulfilled even with a small gap between the housing shell 23 and machine housing 18.
  • the spring device 41 can, as shown, be arranged spatially in the guide 34, or arranged outside the guide 34.
  • the spring device 41 is loaded only along the path 36 and can be designed independently.
  • the spring device 41 damps the first component, while the lever arm 31 essentially does not influence it.
  • the lever arm 31 can damp the second component.
  • a spring constant of the lever arm 31 acting parallel to the working axis 11 may be smaller by one order of magnitude than a spring constant of the spring element 30 of the first suspension 24 acting parallel to the working axis 11.
  • the second component is therefore mediated mainly via the first suspension 24 between the machine housing 18 and handle 7.
  • the lever arm 31 may be provided with a bias, which pulls the handle 7 in the direction of impact 10 to the machine housing 18.
  • the bias of the lever arm 31 thus counteracts the bias in the first suspension 24.
  • the bias of the lever arm 31 is preferably canceled when the user presses the power tool in operation in the direction of impact 10 by between 25% and 75% of the lifting height 29, which is the case in normal operation. Due to the bias of the gap between the housing shell 23 and machine housing 18 can be kept small in the working direction, which saves space.
  • the third suspension 26 is arranged along the working axis 11 at the height of the intermediate beater 17.
  • the center of gravity 19 of the machine housing 18 lies in the direction of impact 10 in front of the third suspension 26, typically more than 20% of the distance of the first suspension 24 to the third suspension 26.
  • the third suspension 26 lies in a plane with the working axis 11.
  • the third suspension 26 connects the machine housing 18 via an inserted into a linear guide 35 pivot bearing 43 with the handle 7.
  • a rotation axis 44 of the pivot bearing 43 is perpendicular to the main plane, which are spanned by the working axis 11 and the handle axis 22.
  • the axis of rotation 44 is offset in the direction of impact 10 to the center of gravity 19 of the machine housing 18.
  • the linear guide 35 extends parallel to the working axis 11.
  • Das Machine housing 18 is thus movable parallel to the working axis 11 and about the rotational axis 44 pivotally relative to the handle 7.
  • the linear guide 35 may be formed, for example, by an elongated groove extending parallel to the working axis 11 in the machine housing 18.
  • the groove has for example a length of 1 cm to 2 cm, which corresponds approximately to the lifting height 29 of the first suspension 24.
  • the handle 7 has, for example, a cylindrical pin which engages in the groove. The pin can rotate in the groove about its axis forming the axis of rotation 44. Similarly, the pin may be provided on the machine housing 18 and the groove in the handle 7.
  • the third suspension 26 may be formed by a ring 45 on the handle 7, in which the machine housing 18 is inserted axially movable (Fig. 3).
  • the inner surface 46 of the ring 45 is convexly curved.
  • the machine housing 18 can tilt in the ring 45 with respect to this about the rotation axis 39.
  • the rotation axis 39 passes through the center of the ring 45.
  • the closed housing shell 23 of the handle 7 may have a cylindrical portion 47 near the tool holder 2.
  • the auxiliary handle 9 may be attached to the cylindrical portion 47.
  • the additional handle 9 is preferably detachable without tools from the housing shell 23, for example, to orient the additional handle 9 new relative to the handle axis 22.
  • the auxiliary handle 9 is indirectly suspended vibration-damped by the three suspensions 24, 25, 26 of the handle 7 on the machine housing 18.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)

Abstract

L'invention concerne un machine-outil portative qui comporte un porte-outil (2) destiné à recevoir un outil de burinage (4) sur un axe de travail (11) et un outil de percussion (6) qui agit sur l'outil (4) dans la direction de percussion (10). L'outil de percussion (6) est disposé dans un carter de machine (18). Une poignée (7) est orientée le long de l'axe de poignée (22) perpendiculairement à l'axe de travail (11) et est montée au moyen de trois suspensions (24, 25, 26) sur le carter de machine (18). La deuxième suspension (25) comporte un bras de levier (31) s'étendant le long de l'axe (22) de la poignée. La première extrémité (32) du bras de levier (31) est fixée à l'un parmi le carter de machine (18) et la poignée (7). Un guide (34) est fixé à l'autre parmi le carter de machine (18) et la poignée (7). La seconde extrémité (33) du bras de levier (31) peut être déviée dans le guide (34) sur une piste (36), perpendiculaire ou inclinée par rapport à l'axe de travail (11), en s'opposant à un moyen à ressort (41).
EP14758866.9A 2013-09-12 2014-09-02 Machine-outil manuelle Active EP3043967B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14758866.9A EP3043967B1 (fr) 2013-09-12 2014-09-02 Machine-outil manuelle

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP20130184071 EP2848370A1 (fr) 2013-09-12 2013-09-12 Machine-outil manuelle
EP14758866.9A EP3043967B1 (fr) 2013-09-12 2014-09-02 Machine-outil manuelle
PCT/EP2014/068571 WO2015036279A1 (fr) 2013-09-12 2014-09-02 Machine-outil portative

Publications (2)

Publication Number Publication Date
EP3043967A1 true EP3043967A1 (fr) 2016-07-20
EP3043967B1 EP3043967B1 (fr) 2017-07-19

Family

ID=49223562

Family Applications (2)

Application Number Title Priority Date Filing Date
EP20130184071 Withdrawn EP2848370A1 (fr) 2013-09-12 2013-09-12 Machine-outil manuelle
EP14758866.9A Active EP3043967B1 (fr) 2013-09-12 2014-09-02 Machine-outil manuelle

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP20130184071 Withdrawn EP2848370A1 (fr) 2013-09-12 2013-09-12 Machine-outil manuelle

Country Status (5)

Country Link
US (1) US10406668B2 (fr)
EP (2) EP2848370A1 (fr)
CN (1) CN105555485B (fr)
ES (1) ES2637198T3 (fr)
WO (1) WO2015036279A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6620434B2 (ja) * 2015-06-12 2019-12-18 マックス株式会社 打撃工具
EP3501750A1 (fr) * 2017-12-19 2019-06-26 Hilti Aktiengesellschaft Machine-outil portative à vibrations amorties
US12021437B2 (en) 2019-06-12 2024-06-25 Milwaukee Electric Tool Corporation Rotary power tool
EP3822036A1 (fr) * 2019-11-12 2021-05-19 Hilti Aktiengesellschaft Agencement de mécanisme de frappe
DE102020216538A1 (de) 2020-12-23 2022-06-23 Robert Bosch Gesellschaft mit beschränkter Haftung Handwerkzeugmaschine
JP2022119301A (ja) * 2021-02-04 2022-08-17 株式会社マキタ 打撃工具
JP2022128006A (ja) * 2021-02-22 2022-09-01 株式会社マキタ 打撃工具
CN115648129B (zh) * 2022-10-29 2024-06-21 江苏东成工具科技有限公司 冲击电动工具

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DE3505181A1 (de) * 1985-02-15 1986-08-21 Hilti Ag, Schaan Schwingungen erzeugendes handwerkzeug
DE3839207A1 (de) 1988-11-19 1990-05-23 Hilti Ag Tragbares handgeraet mit schlagwerk
JP4157382B2 (ja) 2001-04-11 2008-10-01 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング 振動減衰式のハンドグリップを備えた手持ち工作機械
DE10136015A1 (de) * 2001-07-24 2003-02-13 Bosch Gmbh Robert Handwerkzeugmaschine mit vibrationsgedämpftem Handgriff
ATE361182T1 (de) 2001-10-15 2007-05-15 Hilti Ag Kühlluftleitung für ein elektrohandwerkzeuggerät mit elektropneumatischem schlagwerk
ITMI20021231A1 (it) 2002-06-06 2003-12-09 Nuovo Pignone Spa Sistema di controllo e regolazione della temperatura di fiamma per turbine a gas monoalbero
DE10255162A1 (de) * 2002-11-22 2004-06-03 Hilti Ag Vibrationsentkoppelte Schlagwerksbaugruppe
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EP2801448B1 (fr) * 2013-05-06 2017-11-01 HILTI Aktiengesellschaft Machine-outil manuelle

Also Published As

Publication number Publication date
US20160207188A1 (en) 2016-07-21
US10406668B2 (en) 2019-09-10
CN105555485A (zh) 2016-05-04
ES2637198T3 (es) 2017-10-11
WO2015036279A1 (fr) 2015-03-19
CN105555485B (zh) 2017-10-17
EP3043967B1 (fr) 2017-07-19
EP2848370A1 (fr) 2015-03-18

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