EP4058251B1 - Agencement de mécanisme de frappe - Google Patents

Agencement de mécanisme de frappe Download PDF

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Publication number
EP4058251B1
EP4058251B1 EP20797491.6A EP20797491A EP4058251B1 EP 4058251 B1 EP4058251 B1 EP 4058251B1 EP 20797491 A EP20797491 A EP 20797491A EP 4058251 B1 EP4058251 B1 EP 4058251B1
Authority
EP
European Patent Office
Prior art keywords
damper element
hammer
impact
combination
chisel
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.)
Active
Application number
EP20797491.6A
Other languages
German (de)
English (en)
Other versions
EP4058251A1 (fr
Inventor
Uto Plank
Ulrich Mandel
Josef Fünfer
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
Publication of EP4058251A1 publication Critical patent/EP4058251A1/fr
Application granted granted Critical
Publication of EP4058251B1 publication Critical patent/EP4058251B1/fr
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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
    • 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
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/131—Idling mode of tools
    • 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
    • B25D2250/351—Use of pins

Definitions

  • the present invention relates to a drill and/or chisel hammer with a drive motor, a striking mechanism and a tool holder for holding a tool.
  • the impact mechanism has a striker that is axially displaceable in a striker guide and acts on the tool.
  • the impact mechanism is equipped with an empty shock absorber element and a rebound shock absorber element, which are designed in one piece with each other and form a combination damper element.
  • Rotary hammers of the type mentioned are basically known from the prior art and, for example, in EP 1 479 485 A1 described.
  • Empty shock absorber elements and bounce shock absorber elements which are preferably designed as elastomer damping elements, are used to keep force peaks on downstream components and vibrations as low as possible.
  • the striker hits a typically provided impact disc after each impact and is absorbed by the impact dampening element.
  • an empty stroke damping element is typically used. for use.
  • An empty hit dampening of the empty strike damper element influences the return speed of the striker after an empty strike and thus also the stopping behavior of the hammer.
  • the object is achieved in that the striker guide is arranged outside, preferably exclusively outside, of the combination damper element.
  • the invention includes the knowledge that a striker guide implemented within the combination damper element, especially if the combination damper element itself forms part of this striker guide, as in the previously known prior art, a significant reduction in the service life of the Combined damper element and thus the entire impact mechanism.
  • the striker guide is arranged outside, preferably exclusively outside, of the combination damper element, this disadvantage is avoided.
  • the striker is cylindrical.
  • the otherwise preferably cylindrical striker can have a radial bead which is arranged to abut against the empty impact damper element on the one hand and to abut against the bounce damper element on the other hand.
  • the combi-steamer element can have a central recess that extends over the entire length of the combi-steamer element.
  • the striker is preferably accommodated at least in sections within the central recess and/or passed through it.
  • the combination damper element has a cylindrical inner surface which extends in the axial direction between an empty stop stop surface and a bounce stop surface.
  • a radial distance is provided between the cylindrical inner surface and the bead, preferably along the entire inner surface.
  • the radial distance is provided between the cylindrical inner surface and a thickest point of the bead, based on the radial direction.
  • the combination damper element has a flat end stop surface, via which the combination damper element is supported on a shoulder of the tool holder.
  • the front stop surface is annular and/or the front stop surface runs perpendicular to the axial direction of the striker.
  • the combination damper element has a longitudinal slot. It has proven to be advantageous if the longitudinal slot extends axially along the combination damper element on the tool receiving side.
  • the longitudinal slot preferably serves for air exchange. In this way, a vacuum suction of the striker on the empty stop stop surface or at the parking point located on the empty stop stop surface can be avoided. It has proven to be advantageous if, when the empty shock absorber element is compressed, a residual opening remains in the longitudinal slot.
  • the combination damper element consists of or has an elastomeric material. This has the advantage that the combination damper element can be put over the striker comparatively easily when assembling the striking mechanism. In a particularly preferred embodiment, this has Empty shock absorber element has a higher stop rigidity than the rebound shock absorber element.
  • the combination steamer element is formed by two half-shells.
  • a parting plane between the half-shells is oriented parallel to the axial direction of the striker.
  • the striker guide has at least one plain bearing and/or at least one rolling bearing.
  • the striker is guided or supported on both sides outside the combination damper element by a plain bearing and/or at least one roller bearing.
  • FIG. 1 A preferred embodiment of a drill and/or chisel hammer 100 according to the invention is shown in Fig. 1 shown.
  • the drill and/or chisel hammer 100 is equipped with an electric drive motor 70, a striking mechanism 10 and a tool holder 50 for holding a tool 110.
  • the striking mechanism 10, which is arranged in a housing 90, has a striker guide 20 in the axial direction AR movable striker 30 which acts on the tool 110.
  • the impact mechanism 10 has an empty shock absorber element 11 and a rebound shock absorber element 13.
  • the empty shock absorber element 11 and the rebound shock absorber element 13 are designed in one piece with each other and thus form a combination damper element 15.
  • the combination damper element 15 has a central recess 40 which extends over the entire length L ( see. Fig. 2B ) of the combination damper element 15 extends.
  • the striker 30 is at least partially accommodated within the central recess 40 and guided through it.
  • the striker guide 20 has two roller bearings 21, 23, which are arranged completely outside the combination damper element 15.
  • the striker 30 is therefore not stored within the combi-steamer element 15 or by the combi-steamer element 15 itself.
  • the striker 30 is cylindrical and has a radial bead 31 approximately in the middle.
  • the radial bead 31 is designed to abut against the empty shock absorber element 11 on the one hand (left in Fig.1 ) and for striking the impact absorber element 13 on the other hand (right in Fig. 1 ) is arranged.
  • the combination damper element 15 has a cylindrical inner surface 16 which extends in the axial direction AR between an empty impact stop surface 12 of the empty impact damper element 11 and a rebound impact stop surface 14 of the rebound impact damper element 13.
  • the cylindrical inner surface 16 is delimited on the one hand by the beginning of the empty stop stop surface 12 and on the other hand by the beginning of a bounce stop surface 14, each seen in the axial direction AR.
  • a radial distance 19 is provided (particularly easy to see also in Fig. 2B ).
  • the radial distance 19 extends along the entire inner surface 16, ie the thickest point 32 of the bead 31 does not touch the thickest point 32 of the bead 31 at any point between the empty strike stop surface 12 and the rebound strike stop surface 14 cylindrical inner surface 16 of the combination damper element 15. Therefore, undesirable abrasion of the combination damper element 15 is effectively avoided.
  • Fig. 2 now shows a first preferred embodiment of a combination damper element 15, as is the case, for example, in the drill and/or chisel hammer 100 of Fig. 1 can be used.
  • Fig. 2A shows the combination damper element 15 from the view of the tool holder 50. It can be clearly seen that the combination damper element 15 has a flat end stop surface 51, via which the combination damper element 15 rests on a shoulder 52 (see also Fig. 1 ) the tool holder 50 is supported.
  • the combi-steamer element 15 of the Fig. 2 consists, for example, of an elastomeric material and is formed by two half-shells 15', 15", which make assembly easier.
  • a parting plane 18 between the half-shells 15', 15" runs parallel to the axial direction AR.
  • Fig. 2B shows a section through the combi-steamer element 15 along the parting plane 18.
  • the central recess 40 which is delimited by the annular, flat end stop surface 51.
  • the central recess 40 extends over the entire length L of the combination damper element 15.
  • the striker 30 (indicated schematically here) is at least partially accommodated within the central recess 40.
  • the radial distance 19 already described is provided between the cylindrical inner surface 16 and the bead 31, more precisely between the cylindrical inner surface 16 and the thickest point 32 of the bead 31 in the radial direction RR.
  • the empty shock absorber element 11 has a higher stop rigidity than the bounce shock absorber element 13. This is achieved by design alone in such a way that - based on the axial direction AR - a "more" amount of elastomeric material is used in the empty shock absorber element 11 than in the rebound shock absorber element 13. If the empty shock absorber element 11 has a more cylindrical ring-shaped cross section Q11, it widens Cross section Q12 of the impact damper element 13 in the manner of a diffuser (to the right in Fig. 2B ).
  • FIG. 3 A second preferred embodiment of a combination damper element 15 is in Fig. 3 shown.
  • a longitudinal slot 17 is provided, which is located on the tool holder side (in Fig. 3 from the left) extends axially along the combination damper element 15.
  • the longitudinal slot 17 ensures an exchange of air, so that a vacuum suction of the striker (not shown here) on the empty stroke stop surface 12 is avoided.
  • Fig. 3A shows the combination damper element 15 in a relaxed state, ie Döpper is located, for example in Fig. 2B can be seen in a central position.
  • the combination damper element 15, more precisely the empty impact damper element 11, is shown in the compressed state.
  • a residual opening 17' remains from the longitudinal slot 17, through which air exchange is possible even when the empty shock absorber element 11 is compressed.

Landscapes

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

Claims (10)

  1. Marteau perforateur et/ou burineur (100) comportant un moteur d'entraînement (70), un mécanisme de percussion (10) et un réceptacle d'outil (50) destiné à recevoir un outil (110), le mécanisme de percussion (10) présentant une bouterolle (30) pouvant être déplacée axialement (AR) dans un guide de bouterolle (20) et agissant sur l'outil (110), le mécanisme de percussion (10) présentant un élément d'amortissement de frappe à vide (11) et un élément d'amortissement de frappe à rebond (13), lesquels sont réalisés d'un seul tenant l'un avec l'autre et forment ainsi un élément d'amortissement combiné (15),
    caractérisé en ce que le guide de bouterolle (20) est disposé à l'extérieur, de préférence exclusivement à l'extérieur de l'élément d'amortissement combiné (15).
  2. Marteau perforateur et/ou burineur (100) selon la revendication 1,
    caractérisé en ce que la bouterolle (30), par ailleurs de préférence cylindrique, présente un bourrelet (31) radial disposé pour venir en butée contre l'élément d'amortissement de frappe à vide (11) d'une part et pour venir en butée contre l'élément d'amortissement de frappe à rebond (13) d'autre part.
  3. Marteau perforateur et/ou burineur (100) selon la revendication 2,
    caractérisé en ce que l'élément d'amortissement combiné (15) présente une surface intérieure (16) cylindrique qui s'étend dans la direction axiale (AR) entre une surface de butée de frappe à vide (12) et une surface de butée de frappe à rebond (14), un espacement radial (19) étant prévu entre la surface intérieure (16) cylindrique et le bourrelet (31), de préférence le long de toute la surface intérieure (16).
  4. Marteau perforateur et/ou burineur (100) selon l'une des revendications précédentes,
    caractérisé en ce que l'élément d'amortissement combiné (15) présente une surface de butée frontale plane (51) par l'intermédiaire de laquelle l'élément d'amortissement combiné (15) est appuyé sur un épaulement (52) du réceptacle d'outil (50)
  5. Marteau perforateur et/ou burineur (100) selon l'une des revendications précédentes, caractérisé en ce que l'élément d'amortissement combiné (15) présente une fente longitudinale (17) qui s'étend axialement le long de l'élément d'amortissement combiné (15) du côté du réceptacle d'outil.
  6. Marteau perforateur et/ou burineur (100) selon la revendication 5,
    caractérisé en ce que, lorsque l'élément d'amortissement de frappe à vide 11 est comprimé, il reste une ouverture résiduelle 17' de la fente longitudinale 17.
  7. Marteau perforateur et/ou burineur (100) selon l'une des revendications précédentes,
    caractérisé en ce que l'élément d'amortissement combiné (15) est constitué d'un matériau élastomère ou présente un tel matériau.
  8. Marteau perforateur et/ou burineur (100) selon l'une des revendications précédentes,
    caractérisé en ce que l'élément d'amortissement de frappe à vide (11) présente une rigidité de butée plus élevée que celle de l'élément d'amortissement de frappe à rebond (13).
  9. Marteau perforateur et/ou burineur (100) selon l'une des revendications précédentes,
    caractérisé en ce que l'élément d'amortissement combiné (15) est formé par deux demi-coques (15', 15"), un plan de séparation (18) entre les demi-coques (15', 15") étant orienté de préférence parallèlement à la direction axiale (AR) de la bouterolle (30).
  10. Marteau perforateur et/ou burineur (100) selon l'une des revendications précédentes,
    caractérisé en ce que le guide de bouterolle (20) présente au moins un palier lisse et/ou au moins un palier à roulement (21, 23).
EP20797491.6A 2019-11-12 2020-11-02 Agencement de mécanisme de frappe Active EP4058251B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP19208476.2A EP3822036A1 (fr) 2019-11-12 2019-11-12 Agencement de mécanisme de frappe
PCT/EP2020/080640 WO2021094117A1 (fr) 2019-11-12 2020-11-02 Ensemble mécanisme à percussion

Publications (2)

Publication Number Publication Date
EP4058251A1 EP4058251A1 (fr) 2022-09-21
EP4058251B1 true EP4058251B1 (fr) 2023-09-13

Family

ID=68581193

Family Applications (2)

Application Number Title Priority Date Filing Date
EP19208476.2A Withdrawn EP3822036A1 (fr) 2019-11-12 2019-11-12 Agencement de mécanisme de frappe
EP20797491.6A Active EP4058251B1 (fr) 2019-11-12 2020-11-02 Agencement de mécanisme de frappe

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP19208476.2A Withdrawn EP3822036A1 (fr) 2019-11-12 2019-11-12 Agencement de mécanisme de frappe

Country Status (4)

Country Link
US (1) US20240123589A1 (fr)
EP (2) EP3822036A1 (fr)
CN (1) CN114555298B (fr)
WO (1) WO2021094117A1 (fr)

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DE3224176C2 (de) * 1982-06-29 1995-02-02 Bosch Gmbh Robert Motorisch angetriebene schlagende Handwerkzeugmaschine
DE4400779A1 (de) * 1994-01-13 1995-07-20 Duss Maschf Elektropneumatischer Schlag- oder Drehschlaghammer
EP1238759B1 (fr) * 2001-03-07 2003-12-17 Black & Decker Inc. Marteau
DE10157831B4 (de) * 2001-11-24 2004-06-24 Robert Bosch Gmbh Handwerkzeugmaschine mit einem ein Werkzeug aufnehmenden Döpper
GB2401570B (en) * 2003-05-12 2006-07-05 Black & Decker Inc Spindle assembly for hammer drill
DE10362025B4 (de) 2003-05-20 2006-02-09 Robert Bosch Gmbh Bohr- oder Schlaghammer
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JP4525904B2 (ja) * 2004-06-08 2010-08-18 日立工機株式会社 打撃工具
DE102004044499B4 (de) * 2004-09-15 2021-02-18 Robert Bosch Gmbh Handwerkzeugmaschine, insbesondere Bohr- und/oder Schlaghammer
DE102005035099A1 (de) * 2005-07-27 2007-02-01 Robert Bosch Gmbh Schlagwerk und wenigstens schlagend antreibbare Handwerkzeugmaschine mit einem Schlagwerk
DE102006000395A1 (de) * 2006-08-07 2008-02-14 Hilti Ag Handwerkzeugmaschine mit pneumatischem Schlagwerk
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EP2848370A1 (fr) * 2013-09-12 2015-03-18 HILTI Aktiengesellschaft Machine-outil manuelle
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EP2918376A1 (fr) * 2014-03-12 2015-09-16 HILTI Aktiengesellschaft Machine-outil portative de burinage
CN104101422B (zh) * 2014-07-31 2016-08-24 苏州科技学院 超声振动刀具刃口振幅测量装置
EP3231560A1 (fr) * 2016-04-13 2017-10-18 HILTI Aktiengesellschaft Machine-outil portative
FR3058664B1 (fr) * 2016-11-17 2019-07-05 Montabert Appareil a percussions
EP3822037A1 (fr) * 2019-11-15 2021-05-19 Hilti Aktiengesellschaft Agencement de mécanisme de percussion
EP3822030A1 (fr) * 2019-11-15 2021-05-19 Hilti Aktiengesellschaft Marteau perforateur et/ou burin avec agencement de mécanisme de percussion

Also Published As

Publication number Publication date
US20240123589A1 (en) 2024-04-18
CN114555298B (zh) 2024-07-26
CN114555298A (zh) 2022-05-27
WO2021094117A1 (fr) 2021-05-20
EP3822036A1 (fr) 2021-05-19
EP4058251A1 (fr) 2022-09-21

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