EP3117962A1 - Handwerkzeugmaschine - Google Patents

Handwerkzeugmaschine Download PDF

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Publication number
EP3117962A1
EP3117962A1 EP15177226.6A EP15177226A EP3117962A1 EP 3117962 A1 EP3117962 A1 EP 3117962A1 EP 15177226 A EP15177226 A EP 15177226A EP 3117962 A1 EP3117962 A1 EP 3117962A1
Authority
EP
European Patent Office
Prior art keywords
piston
hand tool
excitation
movement axis
closure plate
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Withdrawn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
EP15177226.6A
Other languages
German (de)
English (en)
French (fr)
Inventor
Bernhard Liebert
Olaf Koch
Jerome Jaromin
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 EP15177226.6A priority Critical patent/EP3117962A1/de
Priority to US15/745,415 priority patent/US20180207783A1/en
Priority to CN201680041749.8A priority patent/CN107848098B/zh
Priority to PCT/EP2016/066501 priority patent/WO2017012915A1/de
Priority to EP16738743.0A priority patent/EP3325219B1/de
Publication of EP3117962A1 publication Critical patent/EP3117962A1/de
Withdrawn legal-status Critical Current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
    • B25D17/06—Hammer pistons; Anvils ; Guide-sleeves for pistons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D11/00—Portable percussive tools with electromotor or other motor drive
    • B25D11/06—Means for driving the impulse member
    • B25D11/062—Means for driving the impulse member comprising a wobbling mechanism, swash plate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D11/00—Portable percussive tools with electromotor or other motor drive
    • B25D11/06—Means for driving the impulse member
    • B25D11/12—Means for driving the impulse member comprising a crank mechanism
    • B25D11/125—Means for driving the impulse member comprising a crank mechanism with a fluid cushion between the crank drive and the striking body
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • 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
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/0011—Details of anvils, guide-sleeves or pistons
    • B25D2217/0023—Pistons
    • 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
    • B25D2250/051—Couplings, e.g. special connections between 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
    • B25D2250/065—Details regarding assembling of the tool

Definitions

  • the present invention relates to a chiselling or drilling tool hand tool.
  • a hammer drill is out of the EP 2 857 149 known.
  • the hammer drill has a pneumatic hammer mechanism with a guided in a guide tube excitation piston.
  • a closure plate clamps a connecting rod in the exciter piston.
  • a hand tool has a tool holder for holding a tool, an electric motor and a pneumatic striking mechanism.
  • the impact mechanism has a guided in a guide tube along a movement axis excitation piston and a coupled via a pneumatic chamber to the exciter piston racket, wherein a piston wall of the exciter piston contacts the guide tube.
  • a connecting rod is attached at one end to a piston pin in the exciter piston and coupled to the electric motor at another end.
  • a bearing for supporting the piston pin is formed by a piston head of the excitation piston and a closure plate inserted in the exciter piston, the piston crown opposite.
  • a rotary closure is formed by a groove extending in a direction of rotation about the movement axis in the piston wall of the excitation piston and a radially projecting wing of the closure plate.
  • a pawl for locking the wing against the direction of rotation can be pivoted in the radial direction between a locking position and a releasing position, wherein the pawl is deflected in the releasing position in the radial direction over the outer dimension of the piston wall.
  • the closure plate can be inserted into the hollow exciter piston and fastened by the screw cap.
  • the pawl prevents unwanted free rotation of the closure plate.
  • the pawl itself is inhibited by the guide tube, which must be able to protrude the pawl for the releasing position on the piston wall.
  • Fig. 1 shows as an example of a chiseling hand tool machine schematically a hammer drill 1.
  • the hammer drill 1 has a tool holder 2, in which a shank end 3 of a tool 4, for example one of the drill, can be used and locked.
  • a primary drive of the hammer drill 1 is an electric motor 5, which drives a hammer mechanism 6 and an output shaft 7 .
  • a battery pack 8 or a power line supplies the electric motor 5 with power.
  • a user can guide the hammer drill 1 by means of a handle 9 and be by means of a system switch 10 to the hammer drill 1 is in operation.
  • the hammer drill 1 rotates the drill 4 continuously about a working axis 11 and can beat the drill 4 in the direction of impact 12 along the working axis 11 in a substrate.
  • the percussion 6 is a pneumatic percussion 6.
  • An exciter piston 13 and a racket 14 are movably guided in a guide tube 15 in the striking mechanism 6 along the working axis 11 .
  • the excitation piston 13 is coupled via an eccentric 16 or a wobble finger to the electric motor 5 and forced to a periodic, linear movement.
  • the excitation piston 13 moves on a predetermined by the guide tube 15 movement axis 17, which preferably coincides with the working axis 11 .
  • a connecting rod 18 connects the eccentric 16 and the wobble finger with the excitation piston 13.
  • An air spring formed by a pneumatic chamber 19 between the excitation piston 13 and the racket 14 couples a movement of the racket 14 to the movement of the exciter piston 13 .
  • the bat 14 can strike directly on a rear end of the drill 4 or indirectly transfer a portion of its pulse to the drill 4 via a substantially quiescent striker 20 .
  • the striking mechanism 6 and preferably the further drive components are arranged within a machine housing
  • a piston wall 22 of the exciter piston 13 is substantially cylindrical and adapted in its diameter 23 to the guide tube 15 so that the piston wall 22 rests against the guide tube 15 .
  • the piston wall 22 slides on the inner surface of the guide tube 15, whereby the exciter piston 13 is guided parallel to the movement axis 17 .
  • a piston head 24 of the excitation piston 13 is oriented perpendicular to the movement axis 17 .
  • a diameter 23 of the piston head 24 or the piston wall 22 substantially corresponds to the inner diameter of the guide tube 15 in order to close off the pneumatic chamber 19 through the piston head 24 .
  • the excitation piston 13 is connected by the connecting rod 18 to the eccentric 16 .
  • An axis of rotation 25 of the eccentric 16 is perpendicular to the axis of movement 17 of the impact mechanism 6.
  • the eccentric 16 has, for example, an eccentric finger 26 which rotatably engages in an eye 27 at one end of the connecting rod 18 .
  • the connecting rod 18 has at the other end a piston pin 28.
  • the piston pin 28 is mounted within the excitation piston 13 in a bearing 29 , which allows pivoting of the connecting rod 18 about an axis of rotation 25 parallel to the pivot axis 30 .
  • the piston pin 28 is oriented perpendicular to the movement axis 17 .
  • the piston pin 28 may be rigidly connected to the connecting rod 18 , in particular, the piston pin 28 with respect to the piston pin 28 does not rotate about the pivot axis 30 .
  • the connecting rod 18 and the piston pin 28 are preferably a coherent monolithic component, which is made for example of the same plastic.
  • the connecting rod 18 and the piston pin 28 may be made, for example, in an injection molding process.
  • Monolithic means that the connecting rod 18 and the piston pin 28 are connected inseparably and without joining zone.
  • the connecting rod may have a second eye into which the piston pin is inserted.
  • the piston pin is in this case rotatable relative to the connecting rod about the pivot axis.
  • the bearing 29 for the piston pin 28 is disposed within the exciter piston 13 ( Fig. 2 ).
  • the excitation piston 13 is substantially hollow ( Fig. 3 ).
  • the piston wall 22 and the piston head 24 enclose a cavity 31 which is open on the rear side 32 facing away from the piston head 24 .
  • the piston pin 28 and the connecting rod 18 are inserted into the exciter piston 13 via the rear side 32 .
  • the piston pin 28 abuts against the inside 33 of the piston crown 24 .
  • the inside 33 has a first bearing shell 34 ( Figure 4 ).
  • the first bearing shell 34 preferably includes two semi-cylindrical bearing surfaces 35 which face the impact direction 12 opposite.
  • the piston pin 28 is located on the first bearing shell 34, ie , for example, on the semi-cylindrical bearing surfaces 35, a form-fitting manner.
  • the piston pin 28 is supported in the direction of impact 12 on the first bearing shell 34 .
  • the shape of the first bearing shell 34 which partially encompasses the directions of rotation about the movement axis 17 , furthermore inhibits a rotation of the piston pin 28 in the two directions of rotation about the movement axis 17.
  • the bearing 29 is closed by a closure plate 36 .
  • the closure plate 36 includes a second bearing shell 37 which is opposite the first bearing shell 34 along the movement axis 17 ( Figure 5 ).
  • the second bearing shell 37 rests with its bearing surfaces 38 in the direction of impact 12 against the cylindrical sections of the piston pin 28 .
  • the second bearing surfaces 38 may have a part-cylindrical shape, which lie positively against the piston pin 28 .
  • the exemplary bearing surfaces 38 correspond to a quarter of a cylinder. However, the bearing surfaces 38 abut on the piston pin 28 only in one direction of rotation about the movement axis 17 . In one embodiment, the bearing surfaces 38 may be flat.
  • the bearing surfaces 38 of the closure plate 36 are exposed to low mechanical loads, and may therefore be formed with a smaller contact surface to the piston pin 28 .
  • the closure plate 36 can be inserted along the movement axis 17 into the cavity 31 of the exciter piston 13 .
  • the profile of the cavity 31 along the movement axis 17 and the profile of the closure plate 36 along the movement axis 17 are preferably the same in shape and size ( Fig. 6 ).
  • the profile is the projection along the movement axis 17 on the plane perpendicular thereto.
  • the closure plate 36 slides largely positive fit along the movement axis 17 up to the piston head 24, that is to say adjacent to the first bearing shell 34, into the exciter piston 13 .
  • the closure plate 36 forms together with the piston wall 22 a rotary closure, which fixes the closure plate 36 along the movement axis 17 in the exciter piston 13 .
  • the closure plate 36 has a cylindrical body 39 (indicated by the dashed circle) and two vanes 40 radially projecting from the body , which give the closure plate 36 a non-rotationally symmetrical shape.
  • the radial direction refers throughout the description to the movement axis 17 or longitudinal axis of the excitation piston 13.
  • the two wings 40 define the largest radial dimension 41 of the closure plate 36.
  • the exemplary wings 40 are arranged diametrically from the movement axis 17 .
  • the closure plate 36 may have a different number of wings instead of two.
  • the wings 40 may be formed parallel to the piston head 24 or slightly inclined relative to the piston head 24 may be formed.
  • the cavity 31 has a cylindrical core 42 (indicated by the dashed circle) and two radially projecting recesses 43 which have a complementary to the wings 40 , along the movement axis 17 constant cross-section.
  • the piston wall 22 encloses this cavity 31.
  • the piston wall 22 has two grooves 44 which extend parallel to the piston head 24 or possibly with the inclination of the wings 40 relative to the piston head 24 ( Fig. 7 ).
  • the grooves 44 are opened counter to a direction of rotation 45 in the recesses 43 .
  • the direction of rotation 45 in the description refers continuously to the movement axis 17 or longitudinal axis of the exciter piston 13.
  • the grooves 44 are offset in the direction of rotation 45 to the recesses 43.
  • the grooves 44 may have a constant depth or varying depth along the direction of rotation 45 . However, the depth is sufficiently dimensioned so that a radial distance of the groove bottom from the movement axis 17 is greater than the radial dimension 41 of the closure plate 36, ie the distance of the wings 40 from the movement axis 17 .
  • the number and arrangement of the grooves 44 about the movement axis 17 corresponds to the arrangement of the wings 40 about the movement axis 17th
  • the closure plate 36 is pushed so far into the excitation piston 13 along the movement axis 17 until the wings 40 are at the same height as the grooves 44 . Thereafter, the closure plate 36 can be rotated about the movement axis 17 , whereby the wings 40 slide into the grooves 44 .
  • the closure plate 36 is preferably rotatable about the rotation axis 17 by a rotation angle between 45 degrees and 90 degrees, for example at least 60 degrees, for example at most 75 degrees.
  • the maximum Angle of rotation is limited by a stop 46 , which takes place for example by the closed in the direction of rotation 45 grooves 44 or a stop of the closure plate 36 outside of the grooves 44 .
  • the closure plate 36 is fixed by the rotary closure along the movement axis 17 in the exciter piston 13 .
  • the wings 40 are within the grooves 44 on a contact surface 47 against the direction of impact 12 at.
  • the effective against the direction of impact 12 tensile forces on the exciter piston 13 are introduced via the contact surface 47 .
  • the trapped between the two bearing shells 34, 37 piston pin 28 fixes the connecting rod 18 in the excitation piston thirteenth
  • a pawl 48 is provided in the groove 44 .
  • the pawl 48 engages the groove 44 and inhibits rotation of the wings 40 in the groove 44.
  • the pawl 48 is deflected radially outwardly by the wing 40 to its releasing position.
  • the wing 40 passes the pawl 48 so far that the pawl 48 can return to the wing 40 back into the locking position.
  • the wing 40 is caught in the groove 44 between the stop 46 and the pawl 48 .
  • the exemplary pawl 48 is suspended on a spring element 49 which drives the pawl 48 in the locking position.
  • the exemplary groove 44 has a constant height 50, ie dimension along the movement axis 17.
  • the pawl 48 has a lower height than the groove 44.
  • the exemplary wing 40 has a flat plate 51 and a bump 52.
  • the flat plate 51 may in the Groove 44 slide past the pawl 48 in the direction of rotation 45 , since they do not overlap along the movement axis 17 .
  • the bump 52 abuts the pawl 48 . In the locked position of the closure plate 36 , the bump 52 between the stopper 46 and the pawl 48 is caught.
  • the radial dimensions of the wings 40 and the pawl 48 are dimensioned such that the pawl 48 must be deflected for the releasing position over the circumference of the piston wall 22 .
  • a radial distance 53 of the pawl 48 from the movement axis is less than the radial dimension 41 of the closure plate 36 in the region of the wing 40.
  • the outer radius, ie half the diameter 23 of the piston wall 22 and the inner radius of the guide tube 15, is less than the sum the radial distance of the wing 40 to the movement axis 17 and the radial dimension of the pawl 48.
  • the pawl 48 may be formed as part of the piston wall 22 .
  • the pawl 48 is a protruding into the groove 44 mandrel.
  • the piston wall 22 is so far weakened around the mandrel that the piston wall 22 yields when pressing the blade 40 in the radial direction.
  • the piston wall 22 is slotted adjacent the pawl 48 .
  • a longitudinal slot 54 extends parallel to the groove 44 in the direction of impact 12 above and below the pawl 48.
  • An opening 55 extends adjacent to the pawl 48 parallel to the movement axis 17 and connects the two longitudinal slots 54.
  • the section of the piston wall bordered by the longitudinal slots 54 22 forms in the embodiment as a solid-body joint , the spring element 49, which behaves elastically at the radial deflection in the releasing position of the pawl 48 .
  • the slots 54 break through the piston wall 22.
  • the excitation piston 13 has a circumferential groove 56 on the outside of the piston wall 22 .
  • a sealing ring 57 the groove 56 is inserted.
  • the groove 56 overlaps along the movement axis 17 with the piston pin 28.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
EP15177226.6A 2015-07-17 2015-07-17 Handwerkzeugmaschine Withdrawn EP3117962A1 (de)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP15177226.6A EP3117962A1 (de) 2015-07-17 2015-07-17 Handwerkzeugmaschine
US15/745,415 US20180207783A1 (en) 2015-07-17 2016-07-12 Portable Power Tool
CN201680041749.8A CN107848098B (zh) 2015-07-17 2016-07-12 手持式工具机
PCT/EP2016/066501 WO2017012915A1 (de) 2015-07-17 2016-07-12 Handwerkzeugmaschine
EP16738743.0A EP3325219B1 (de) 2015-07-17 2016-07-12 Handwerkzeugmaschine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15177226.6A EP3117962A1 (de) 2015-07-17 2015-07-17 Handwerkzeugmaschine

Publications (1)

Publication Number Publication Date
EP3117962A1 true EP3117962A1 (de) 2017-01-18

Family

ID=53673819

Family Applications (2)

Application Number Title Priority Date Filing Date
EP15177226.6A Withdrawn EP3117962A1 (de) 2015-07-17 2015-07-17 Handwerkzeugmaschine
EP16738743.0A Active EP3325219B1 (de) 2015-07-17 2016-07-12 Handwerkzeugmaschine

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP16738743.0A Active EP3325219B1 (de) 2015-07-17 2016-07-12 Handwerkzeugmaschine

Country Status (4)

Country Link
US (1) US20180207783A1 (zh)
EP (2) EP3117962A1 (zh)
CN (1) CN107848098B (zh)
WO (1) WO2017012915A1 (zh)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3260239A1 (de) * 2016-06-24 2017-12-27 HILTI Aktiengesellschaft Handwerkzeugmaschine
CN110394769B (zh) * 2018-04-24 2022-03-01 博世电动工具（中国）有限公司 电动工具
EP3581337A1 (de) * 2018-06-11 2019-12-18 HILTI Aktiengesellschaft Handwerkzeugmaschine
EP4371709A1 (de) * 2022-11-15 2024-05-22 Hilti Aktiengesellschaft Schlagwerk für eine elektrohandwerkzeugmaschine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2272630A2 (de) * 2009-07-06 2011-01-12 Robert Bosch GmbH Elektrohammervorrichtung
EP2857149A1 (de) 2013-10-03 2015-04-08 HILTI Aktiengesellschaft Handwerkzeugmaschine

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5081910A (en) * 1990-04-10 1992-01-21 Ascenzo Jr Frank D Locking linear actuator
JP3618264B2 (ja) * 1999-10-18 2005-02-09 Ｓｍｃ株式会社 エスケープメントシリンダ
US6832539B2 (en) * 2002-07-15 2004-12-21 Delaware Capital Formation, Inc. Cylinder lock
DE102006000252A1 (de) * 2006-05-30 2007-12-06 Hilti Ag Handwerkzeugmaschine mit Rutschkupplung
DE102007000081A1 (de) * 2007-02-08 2008-08-21 Hilti Ag Handwerkzeugmaschine mit pneumatischem Schlagwerk
DE102009002474A1 (de) * 2009-04-20 2010-10-21 Hilti Aktiengesellschaft Pneumatisches Schlagwerk und Handwerkzeugmaschine
DE102010029917A1 (de) * 2010-06-10 2011-12-15 Hilti Aktiengesellschaft Werkzeugmaschine
DE102011075765A1 (de) * 2011-05-12 2012-11-15 Hilti Aktiengesellschaft Handwerkzeugmaschine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2272630A2 (de) * 2009-07-06 2011-01-12 Robert Bosch GmbH Elektrohammervorrichtung
EP2857149A1 (de) 2013-10-03 2015-04-08 HILTI Aktiengesellschaft Handwerkzeugmaschine

Also Published As

Publication number Publication date
EP3325219A1 (de) 2018-05-30
WO2017012915A1 (de) 2017-01-26
CN107848098B (zh) 2020-11-10
CN107848098A (zh) 2018-03-27
US20180207783A1 (en) 2018-07-26
EP3325219B1 (de) 2019-05-15

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