EP4378629A1 - Dispositif de réception d'outil pour un marteau perforateur ou burineur doté d'un amortissement de frappe à vide et de percussion - Google Patents

Dispositif de réception d'outil pour un marteau perforateur ou burineur doté d'un amortissement de frappe à vide et de percussion Download PDF

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Publication number
EP4378629A1
EP4378629A1 EP22211126.2A EP22211126A EP4378629A1 EP 4378629 A1 EP4378629 A1 EP 4378629A1 EP 22211126 A EP22211126 A EP 22211126A EP 4378629 A1 EP4378629 A1 EP 4378629A1
Authority
EP
European Patent Office
Prior art keywords
tool holder
holder body
tool
elastomer
holding device
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.)
Pending
Application number
EP22211126.2A
Other languages
German (de)
English (en)
Inventor
Maximilian Knyrim
Olaf Koch
Aaron Wiedner
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 EP22211126.2A priority Critical patent/EP4378629A1/fr
Priority to PCT/EP2023/081709 priority patent/WO2024115094A1/fr
Publication of EP4378629A1 publication Critical patent/EP4378629A1/fr
Pending 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
    • B25D17/08—Means for retaining and guiding the tool bit, e.g. chucks allowing axial oscillation of the tool bit
    • 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
    • B25D—PERCUSSIVE TOOLS
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/0011—Details of anvils, guide-sleeves or pistons
    • B25D2217/0019—Guide-sleeves
    • 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
    • B25D2250/121—Housing details
    • 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

Definitions

  • the present invention relates to a tool holder device for a drilling or chisel hammer, comprising a tubular tool holder body for a tool, at the proximal end of which a coaxially rearwardly arranged impact ram of a percussion mechanism is provided, which is acted upon by a percussion piston, wherein the tool holder body is elastically mounted axially on both sides via at least two elastomer elements, wherein for one direction of action at least a first elastomer element is arranged axially between the tool holder body and a distal, stationary housing stop, whereas for the other direction of action at least a second elastomer element is arranged axially between the tool holder body and a guide tube of the percussion mechanism in order to implement idle impact and rebound impact damping.
  • the invention also relates to a drilling or chisel hammer for machining a mineral material, in particular concrete or stone, with such a tool holder device.
  • the field of application of the invention extends primarily to hand-held drilling or chisel hammers which are equipped with an electric motor drive.
  • Such electric hand-held power tools generate a linear alternating working movement via a mechanical impact mechanism, i.e. a back and forth movement to act on the tool, which in the case of a chisel hammer is designed as a chisel and in the case of a hammer drill as an impact drill for working preferably mineral materials - such as stone, concrete and the like.
  • An electric hand-held power tool which can be driven by impact usually has a linear alternating working movement due to an interaction with The workpiece and the operator's hand-arm system as well as the internal mass and stiffness distribution result in complex vibration behavior, which must be suppressed as far as possible.
  • tool holders are primarily used to fix and guide the drilling or chiseling tools in these machines.
  • the tool holder transfers torque to the tool, ensures that impact pulses are transmitted from the impact mechanism to the workpiece by allowing limited axial movements, and prevents the tool from accidentally falling out of the machine.
  • the tool holder device according to the invention is particularly exposed to so-called idle blows and bounce blows in the context of the impact mechanism pulses. Idle blows occur when tools are accelerated by impact pulses from the impact mechanism, but this impact energy cannot be transmitted to the workpiece because the tool is not in contact with the workpiece. Bounce blows occur when the tool is in contact with too much force and/or a workpiece that is too hard, so that the impact pulses from the impact mechanism essentially have a feedback effect on the machine.
  • a generic tool holder device which is equipped with means for dampening idle and rebound impacts.
  • the tool holder device essentially consists of a tubular tool holder body for the tool, which is acted upon from the rear by a ram, a so-called striker, of a pneumatic impact mechanism.
  • the tool is locked within the tool holder body via a locking mechanism.
  • the tool holder body is axially elastically mounted on both sides via two elastomer elements, whereby the first elastomer element is arranged axially between the tool holder body and a distal, stationary housing stop.
  • the second elastomer element is arranged axially between the ram of the impact mechanism and a guide tube of the impact mechanism, which is mounted on the opposite end to a stationary Housing stop comes into contact.
  • Both elastomer elements are designed as O-rings and are pre-tensioned via the adjacent component structures, such as shoulder flanks, guide rings or sleeves, so that the axial play of the tool holder is reduced and the damping effect of the elastomer elements can be used optimally.
  • the axial pre-tension caused by the elastomer elements between the tool holder body and the machine housing causes friction between the adjacent components, since the tool holder body moves, and in particular can rotate, relative to the machine housing when the damping elements are tensioned. This component friction leads to energy losses in terms of the battery capacity in battery-operated electric hand tools, which manifests itself in a significant shortening of the machine running time and, in extreme cases, can also lead to thermal failures as a result of heat development at the friction points.
  • the invention includes the technical teaching that, for the axially elastic mounting of the tool holder body on both sides, the elastomer elements used for this purpose interact with the associated holding means for axially pre-tensioned fastening to the tool holder body.
  • the tool holder according to the invention is mounted in a floating manner and thus friction is reduced.
  • the solution according to the invention uses elastomer elements to dampen axial impacts, which are pre-tensioned within the tool holder and therefore do not press against the gear housing or fixed attachments. This significantly reduces component friction in the area of the tool holder. At the same time, the damping effect of the elastomer elements against axial impacts in the sense of idle impact and rebound impact damping is ensured.
  • the holding means attach the elastomer elements to the tool holder body in an axially pre-tensioned manner, a certain amount of play is created between the respective holding means and the component of the tool holder adjacent to the housing, which can be dimensioned to a minimum gap width, so that component friction is completely eliminated and the relatively stiff spring characteristic of a pre-tensioned elastomer element can still be used. Without pre-tension, the compression travel of the elastomer element would initially be too soft before the damping effect develops. With the pre-tensioned fastening of the elastomer element directly to the tool holder body implemented according to the invention, an initially soft compression travel, which does not contribute to effective idle impact and rebound impact damping, is avoided.
  • the holding means each have a stop ring or a stop sleeve for the associated elastomer element and a locking ring for the positive fastening of the stop ring or the stop sleeve to a pre-stressing axial position on the tool holder body.
  • the locking ring can be designed as a snap ring made of spring steel and the corresponding stop ring or the stop sleeve can be manufactured as a stamped and bent part from a sheet metal material.
  • the stop ring for the first elastomer element should have an L-shaped cross section, from which the first Elastomer element is enclosed with both legs on the outside wall of the tool holder body. Since this damping point assigned to the first elastomer element is realized on the outer circumference of the tool holder body, a stop ring enclosing the first elastomer element is recommended to save installation space.
  • the first elastomer element preferably has a rectangular cross-section. This allows the entire space formed between the L-shaped stop ring and the corresponding housing shoulder on the tool holder body to be filled to the maximum with elastomer material, which in turn enables optimal dimensioning.
  • the stop ring for the second elastomer element which also preferably has an L-shaped cross section, is arranged on the tool holder body in such a way that its axial leg comes to rest on the outside of the tool holder body on the inside wall.
  • the installation position of the second stop ring is therefore on the inside circumference of the tool holder body, preferably opposite the same tubular shoulder on which the first elastomer element comes to rest on the outside.
  • the associated stop ring can be pushed into the tubular tool holder body and fixed in the desired position by the locking ring.
  • an elastomer element with a circular cross-section is preferably used. Since there is sufficient space in the radial direction at this damping point, a compact cross-sectional shape is not necessary.
  • the idle impact and rebound impact damping consists of exactly two ring-shaped elastomer elements, which are arranged concentrically to the axis of rotation of the tubular tool holder body.
  • the two elastomer elements are each attached to the tool holder body with an axial preload path of 1 to 30% of the axial element length.
  • this preload path is sufficient to ensure that the spring properties of the elastomer elements are not restricted too much by the preload and, on the other hand, sufficient preload is applied in the stressed area to implement the optimal spring characteristic curve for the intended use, as described above.
  • a tool holder device known in the prior art and therefore conventional for a drill or chisel hammer - not shown here in more detail - usually consists of a tubular tool holder body 1, in which a grooved distal end region of a tool - also not shown here - can be inserted in a conventional manner and then locked.
  • a percussion ram 2 of a percussion mechanism 3 arranged coaxially to the rear of the tool acts on the tool.
  • the pneumatic percussion mechanism 3 comprises a percussion piston 4 which is arranged coaxially on the percussion ram 2 and dynamically sealed in a guide tube 5 and which in turn is acted upon by a connecting rod drive 6 in a generally known manner.
  • the tool holder body 1 of the conventional tool holder device is axially elastically mounted on both sides via two ring-shaped elastomer elements 7 and 8.
  • the first elastomer element 7 intended for one direction of action is arranged in an axially prestressed manner between the tool holder body 1 and a distal, stationary housing stop 9.
  • the housing stop 9 is part of a housing extension 11 which is fixedly attached to the machine housing 10 and extends this in the tool direction.
  • the first elastomer element 7 is enclosed by a stop ring 12 which is arranged so as to be displaceable relative to the tool holder body 1 and is loose in this respect.
  • the second elastomer element 8 is used for the other effective direction of the damping, which acts axially between the tool holder body 1 and the guide tube 5 of the impact mechanism 3 as a housing-fixed component arrangement.
  • a stop sleeve 13 is also provided here to bridge the gap, which rests on one side on the second elastomer element 8 and on the other side on the guide tube 5 of the impact mechanism 3.
  • a bridging stop ring 14 Opposite the second elastomer element 8 in the direction of the tool holder body 1 there is also a bridging stop ring 14, which serves as the end stop of the impact ram 2 in the retraction direction.
  • the two elastomer elements 7 and 8 for the idle impact and rebound impact damping are not pre-tensioned via housing components and are arranged in the tool holder device.
  • the same designations and reference symbols apply to identical components as were used in the above description of the prior art, and additional components are provided with further reference symbols and designations.
  • the two annular elastomer elements 7 and 8 are each provided with associated holding means for axially prestressed fastening to the tool holder body 1, which, with regard to the first elastomer element, fastens the stop ring 12 to the tool holder body 1 with an additional locking ring 15 in such a way that the first elastomer element 7, which is rectangular in cross section here, is prestressed between the visible housing shoulder of the tool holder body 1 and the stop ring 12.
  • the stop ring associated with it also has an L-shaped cross-section, but this is oriented in a different assembly position relative to the adjacent components. This is because the short leg of the stop ring 16, which is L-shaped in cross-section, comes to rest with its outer surface on the inner wall of the tool holder body 1 and is fastened to the tool holder body 1 by the associated locking ring 17 in the desired position pre-tensioning the elastomer element 8.
  • the second elastomer element 8 has a circular cross-section.
  • the invention is not limited to the preferred embodiment described above. Rather, modifications of this are also conceivable, which are also covered by the scope of the following claims.
  • the holding means that cause a preload on the tool holder body differently than L-shaped stop rings.
  • other holding means such as flat rings, pressure sleeves and the like, are also conceivable, provided that they can be accommodated within the tool holder device.
  • annular elastomer element instead of an annular elastomer element, several Individual elastomer elements can be provided, which are arranged, for example, at a distance from one another around the tubular tool holder body.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
EP22211126.2A 2022-12-02 2022-12-02 Dispositif de réception d'outil pour un marteau perforateur ou burineur doté d'un amortissement de frappe à vide et de percussion Pending EP4378629A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP22211126.2A EP4378629A1 (fr) 2022-12-02 2022-12-02 Dispositif de réception d'outil pour un marteau perforateur ou burineur doté d'un amortissement de frappe à vide et de percussion
PCT/EP2023/081709 WO2024115094A1 (fr) 2022-12-02 2023-11-14 Dispositif porte-outil pour marteau perforateur ou marteau à piquer à impact sans charge et amortissement d'impact de charge de rebond

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22211126.2A EP4378629A1 (fr) 2022-12-02 2022-12-02 Dispositif de réception d'outil pour un marteau perforateur ou burineur doté d'un amortissement de frappe à vide et de percussion

Publications (1)

Publication Number Publication Date
EP4378629A1 true EP4378629A1 (fr) 2024-06-05

Family

ID=84462652

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22211126.2A Pending EP4378629A1 (fr) 2022-12-02 2022-12-02 Dispositif de réception d'outil pour un marteau perforateur ou burineur doté d'un amortissement de frappe à vide et de percussion

Country Status (2)

Country Link
EP (1) EP4378629A1 (fr)
WO (1) WO2024115094A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2414701A (en) * 2004-06-05 2005-12-07 Black & Decker Inc Rotary spindle for a power tool
EP2103389A1 (fr) * 2008-03-21 2009-09-23 Makita Corporation Outil à impact
CN208409769U (zh) * 2018-03-08 2019-01-22 苏州宝时得电动工具有限公司 锤击工具
US20200119600A1 (en) 2017-06-14 2020-04-16 Makita Corporation Electric tool

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2414701A (en) * 2004-06-05 2005-12-07 Black & Decker Inc Rotary spindle for a power tool
EP2103389A1 (fr) * 2008-03-21 2009-09-23 Makita Corporation Outil à impact
US20200119600A1 (en) 2017-06-14 2020-04-16 Makita Corporation Electric tool
CN208409769U (zh) * 2018-03-08 2019-01-22 苏州宝时得电动工具有限公司 锤击工具

Also Published As

Publication number Publication date
WO2024115094A1 (fr) 2024-06-06

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