EP1886767A2 - Hand tool machine with pneumatic striking mechanism - Google Patents

Hand tool machine with pneumatic striking mechanism Download PDF

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Publication number
EP1886767A2
EP1886767A2 EP07113295A EP07113295A EP1886767A2 EP 1886767 A2 EP1886767 A2 EP 1886767A2 EP 07113295 A EP07113295 A EP 07113295A EP 07113295 A EP07113295 A EP 07113295A EP 1886767 A2 EP1886767 A2 EP 1886767A2
Authority
EP
European Patent Office
Prior art keywords
damping element
hand tool
striker
axially
anvil
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Withdrawn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
EP07113295A
Other languages
German (de)
French (fr)
Other versions
EP1886767A3 (en
Inventor
Stefan Hammerstingl
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 EP1886767A2 publication Critical patent/EP1886767A2/en
Publication of EP1886767A3 publication Critical patent/EP1886767A3/en
Withdrawn legal-status Critical Current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
    • 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
    • B25D11/00—Portable percussive tools with electromotor or other motor drive
    • B25D11/005—Arrangements for adjusting the stroke of the impulse member or for stopping the impact action when the tool is lifted from the working surface
    • 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
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/0011—Details of anvils, guide-sleeves or pistons
    • B25D2217/0015—Anvils
    • 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
    • B25D2250/131—Idling mode of tools

Definitions

  • the invention refers to an at least partially striking hand tool with a pneumatic impact mechanism such as a chisel hammer or a hammer drill.
  • a pneumatic percussion mechanism has a guided in a guide tube and driven by an air spring air piston, which usually strikes a limited axially movable striker, which hits even the front end of a limited axially movable tool.
  • EP0014760 and the W003024671 has a beating hand tool with a pneumatic percussion on a damping element, which dampens both a free space of the flying piston and an impact impact of the striker. It points after the W003024671 the flying piston on an axially offset outer portion by a tapered portion, which penetrates rubbing into a radially narrower steel ring of the damping element and thereby dissipates a large part of the kinetic energy of the flying piston in the damping element during idle over a long axial pre-damping.
  • the object of the invention consists in a suitable damping of both the blank and the impact impact of the striker damping element.
  • a hand tool for at least partially beating drive a tool a pneumatic percussion with a guided in a guide tube as well as by an air spring axially reciprocatingly driven air piston, which on the tool side strikes a limited axially movable striker, which is axially impact contacted with the tool, wherein in the guide tube, a viscoelastic damping element is arranged, which radially inwardly limited in an axially on both sides, encircling radial groove of the striker engages.
  • the radial groove of the striker has an axial length in the range of half to twice the diameter of the striker, whereby the axial movement of the striker in the normal operating state is not limited by the damping element.
  • the damping element is annular, further advantageous as an O-ring with a ring thickness in the range of one quarter to one third of the diameter of the striker, whereby by utilizing the rotational symmetry standardized components with a sufficiently large dissipation volume can be used.
  • the damping element is arranged with its radially outer part in a Radialinnennut of the guide tube, further advantageously supported axially by means of annular disks, whereby a majority of the damping element is disposed in the radial region of the guide tube and thus the striker in the axial region of the radial groove is only slightly tapered, which its acoustic Impedance at the axial edge of the radial groove does not change significantly and thus causes practically no reflections of the shock wave.
  • the damping element consists of a fluoro-elastomer, such as vinylidene fluoride-hexafluoro-propylene (VF2 / HFP), whereby a highly wear-resistant and high-temperature resistant damping element is realized.
  • VF2 / HFP vinylidene fluoride-hexafluoro-propylene
  • a hand tool machine 1 (only partially shown) drives a tool 3 introduced into a tool holder 2 along an axis A in a rotating and striking manner, in that a pneumatic percussion mechanism 4 is axially guided by a spring tube 6 guided in a guide tube 5 and by an air spring 6. and forth powered driven air piston 7 is present, which on the tool side strikes a limited axially movable striker 8, which in turn strikes the tool 3 axially.
  • a viscoelastic damping element 9 of vinylidene fluoride-hexafluoro-propylene VF2 / HFP is arranged in the form of an O-ring with its radially outer part in a Radialinnennut 10 of the guide tube 5 and axially supported by an annular disc 11.
  • the damping element 9 with a ring thickness R of one quarter of the diameter D of the striker 8 engages radially inwardly with an axially limited axial limitations on both sides 12, circumferential radial groove 13 of the striker 8, whose axial length L corresponds to the diameter D of the striker 8.

Landscapes

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

Abstract

The tool (1) has an anvil (8) applying blows to a working tool (3) and axially displaceable within certain limits. A pneumatic percussion mechanism (4) e.g. chisel hammer, axially impacts the anvil, where the mechanism includes a guide tube (5) and a percussion piston (7) applies impacts to the anvil. An air spring (6) drives the percussion piston for applying impacts to the anvil. A viscoelastic damping member is arranged in the tube and engaged in a circumferential radial groove of the anvil and axially limited at opposite sides, where the damping member is formed of fluoroelastomer.

Description

Die Erfindung bezeichnet eine zumindest teilweise schlagende Handwerkzeugmaschine mit einem pneumatischen Schlagwerk wie einen Meisselhammer oder einen Bohrhammer.The invention refers to an at least partially striking hand tool with a pneumatic impact mechanism such as a chisel hammer or a hammer drill.

Ein pneumatisches Schlagwerk weist einen in einem Führungsrohr geführten sowie durch eine Luftfeder angetriebenen Flugkolben auf, welcher üblicherweise auf einen begrenzt axial beweglichen Döpper schlägt, der selbst auf das Stirnende eines begrenzt axial beweglichen Werkzeugs trifft.A pneumatic percussion mechanism has a guided in a guide tube and driven by an air spring air piston, which usually strikes a limited axially movable striker, which hits even the front end of a limited axially movable tool.

Bei aussergewöhnlichen Betriebszuständen wie bei werkzeugseitig gerichteten Leerschlägen bei vom Untergrund abgehobenem Werkzeug als auch bei zurückreflektierten, entgegengesetzt gerichteten Prallschlägen bei einem hartelastischen Armierungstreffer kommt das Schlagwerk aus dem optimierten Normalbetriebszustand und erzeugt verstärkte Vibrationen, welche gedämpft werden müssen.In unusual operating conditions such as tool-side directed clearances with tool lifted off the ground as well as back-reflected, oppositely directed impact impacts with a hard-elastic Armierungstreffer the striking mechanism comes from the optimized normal operating condition and generates amplified vibrations, which must be damped.

Nach der EP0014760 und der W003024671 weist eine schlagende Handwerkzeugmaschine mit einem pneumatischen Schlagwerk ein Dämpfelement auf, welches sowohl einen Leerschlag des Flugkolbens als auch einen Prallschlag des Döppers dämpft. Dabei weist nach der W003024671 der Flugkolben einen durch einen verjüngten Abschnitt axial abgesetzten Aussenkonus auf, der reibend in einen radial engeren Stahlring des Dämpfelements eindringt und dadurch beim Leerschlag über einen langen axialen Vordämpfbereich einen Grossteil der Bewegungsenergie des Flugkolbens in dem Dämpfelement dissipiert.After EP0014760 and the W003024671 has a beating hand tool with a pneumatic percussion on a damping element, which dampens both a free space of the flying piston and an impact impact of the striker. It points after the W003024671 the flying piston on an axially offset outer portion by a tapered portion, which penetrates rubbing into a radially narrower steel ring of the damping element and thereby dissipates a large part of the kinetic energy of the flying piston in the damping element during idle over a long axial pre-damping.

Die Aufgabe der Erfindung besteht in einem zur Dämpfung sowohl des Leerschlags als auch des Prallschlags des Döppers geeigneten Dämpfelement.The object of the invention consists in a suitable damping of both the blank and the impact impact of the striker damping element.

Die Aufgabe wird im Wesentlichen durch die Merkmale des Anspruchs 1 gelöst. Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen.The object is essentially achieved by the features of claim 1. Advantageous developments emerge from the subclaims.

So weist eine Handwerkzeugmaschine zum zumindest teilweise schlagenden Antrieb eines Werkzeugs ein pneumatisches Schlagwerk mit einem in einem Führungsrohr geführten sowie durch eine Luftfeder axial hin- und herbewegt angetriebenen Flugkolben auf, welcher werkzeugseitig auf einen begrenzt axial beweglichen Döpper schlägt, der axial schlagend mit dem Werkzeug kontaktierbar ist, wobei im Führungsrohr ein viskoelastisches Dämpfungselement angeordnet ist, welches radial innen in eine axial beidseitig begrenzte, umlaufende Radialnut des Döppers eingreift.Thus, a hand tool for at least partially beating drive a tool a pneumatic percussion with a guided in a guide tube as well as by an air spring axially reciprocatingly driven air piston, which on the tool side strikes a limited axially movable striker, which is axially impact contacted with the tool, wherein in the guide tube, a viscoelastic damping element is arranged, which radially inwardly limited in an axially on both sides, encircling radial groove of the striker engages.

Durch die axial beidseitig begrenzte, umlaufende Radialnut wird bei aussergewöhnlichen Betriebszuständen die Bewegung des Döppers axial beidseitig elastisch begrenzt und dessen Bewegungsenergie im Dämpfungselement dissipiert. Dabei wird sowohl der Leerschlag als auch der Prallschlag des Döppers mit einem gemeinsamen Dämpfungselement hinreichend gedämpft.Due to the axially limited on both sides, circumferential radial groove, the movement of the striker is elastically limited axially on both sides in exceptional operating conditions and its kinetic energy dissipated in the damping element. In this case, both the idle and the impact impact of the striker is sufficiently attenuated with a common damping element.

Vorteilhaft weist die Radialnut des Döppers eine axiale Länge im Bereich von der Hälfte bis zu dem Doppelten des Durchmessers des Döppers auf, wodurch die axiale Bewegung des Döppers im Normalbetriebszustand nicht durch das Dämpfelement begrenzt wird.Advantageously, the radial groove of the striker has an axial length in the range of half to twice the diameter of the striker, whereby the axial movement of the striker in the normal operating state is not limited by the damping element.

Vorteilhaft ist das Dämpfelement kreisringförmig ausgebildet, weiter vorteilhaft als O-Ring mit einer Ringdicke im Bereich von einem Viertel bis zu einem Drittel des Durchmessers des Döppers, wodurch unter Ausnutzung der Rotationssymmetrie standardisierte Bauteile mit einem hinreichend grossen Dissipationsvolumen verwendbar sind.Advantageously, the damping element is annular, further advantageous as an O-ring with a ring thickness in the range of one quarter to one third of the diameter of the striker, whereby by utilizing the rotational symmetry standardized components with a sufficiently large dissipation volume can be used.

Vorteilhaft ist das Dämpfelement mit seinem radial äusseren Teil in einer Radialinnennut des Führungsrohres angeordnet, weiter vorteilhaft mittels Ringscheiben axial gestützt, wodurch ein Grossteil des Dämpfelements im Radialbereich des Führungsrohres angeordnet ist und somit der Döpper im Axialbereich der Radialnut nur unwesentlich verjüngt ist, was seine akustische Impedanz am axialen Rand der Radialnut nicht wesentlich verändert und somit praktisch keine Reflektionen der Stosswelle verursacht.Advantageously, the damping element is arranged with its radially outer part in a Radialinnennut of the guide tube, further advantageously supported axially by means of annular disks, whereby a majority of the damping element is disposed in the radial region of the guide tube and thus the striker in the axial region of the radial groove is only slightly tapered, which its acoustic Impedance at the axial edge of the radial groove does not change significantly and thus causes practically no reflections of the shock wave.

Vorteilhaft besteht das Dämpfungselement aus einem Fluor-Elastomer, wie Vinylidenfluorid-Hexafluoro-Propylen (VF2/HFP), wodurch ein hochverschleissfestes und hochtemperaturbeständiges Dämpfungselement realisiert ist.Advantageously, the damping element consists of a fluoro-elastomer, such as vinylidene fluoride-hexafluoro-propylene (VF2 / HFP), whereby a highly wear-resistant and high-temperature resistant damping element is realized.

Die Erfindung wird bezüglich eines vorteilhaften Ausführungsbeispiels näher erläutert mit:

  • Fig. 1 als Handwerkzeugmaschine
  • Fig. 2 als Ausschnitt des Schlagwerks im Längsschnitt
The invention will be explained in more detail with respect to an advantageous embodiment with:
  • Fig. 1 as a hand tool
  • Fig. 2 as a detail of the striking mechanism in longitudinal section

Nach Fig. 1 treibt eine (nur teilweise dargestellte) Handwerkzeugmaschine 1 ein längs einer Achse A in eine Werkzeugaufnahme 2 eingeführtes Werkzeug 3 drehend und schlagend an, indem ein pneumatisches Schlagwerk 4 mit einem in einem Führungsrohr 5 geführten sowie durch eine Luftfeder 6 axial hin- und herbewegt angetriebenen Flugkolben 7 vorhanden ist, welcher werkzeugseitig auf einen begrenzt axial beweglichen Döpper 8 schlägt, der seinerseits axial auf das Werkzeug 3 schlägt.According to FIG. 1, a hand tool machine 1 (only partially shown) drives a tool 3 introduced into a tool holder 2 along an axis A in a rotating and striking manner, in that a pneumatic percussion mechanism 4 is axially guided by a spring tube 6 guided in a guide tube 5 and by an air spring 6. and forth powered driven air piston 7 is present, which on the tool side strikes a limited axially movable striker 8, which in turn strikes the tool 3 axially.

Nach Fig. 2 ist ein viskoelastisches Dämpfungselement 9 aus Vinylidenfluorid-Hexafluoro-Propylen VF2/HFP in Form eines O-Rings mit seinem radial äusseren Teil in einer Radialinnennut 10 des Führungsrohr 5 angeordnet und mittels einer Ringscheibe 11 axial gestützt. Das Dämpfungselement 9 mit einer Ringdicke R von einem Viertel des Durchmessers D des Döppers 8 greift radial innen in eine mit Axialbegrenzungen 12 axial beidseitig begrenzte, umlaufende Radialnut 13 des Döppers 8 ein, deren Axiale Länge L dem Durchmesser D des Döppers 8 entspricht. Im dargestellten aussergewöhnlichen Betriebszustand eines Prallschlags wird die maschinenseitig gerichtete Bewegung des Döppers 8 gedämpft, indem sich die werkzeugseitige Axialbegrenzung 12 gegen das Dämpfungselement 9 presst und dieses viskoelastisch verformt, wodurch Bewegungsenergie im Dämpfungselement 9 dissipiert wird.2, a viscoelastic damping element 9 of vinylidene fluoride-hexafluoro-propylene VF2 / HFP is arranged in the form of an O-ring with its radially outer part in a Radialinnennut 10 of the guide tube 5 and axially supported by an annular disc 11. The damping element 9 with a ring thickness R of one quarter of the diameter D of the striker 8 engages radially inwardly with an axially limited axial limitations on both sides 12, circumferential radial groove 13 of the striker 8, whose axial length L corresponds to the diameter D of the striker 8. In the illustrated exceptional operating state of a collision impact, the machine-side directed movement of the striker 8 is damped by the tool-side Axialbegrenzung 12 presses against the damping element 9 and this visco-elastically deformed, whereby kinetic energy is dissipated in the damping element 9.

Claims (5)

Handwerkzeugmaschine zum zumindest teilweise schlagenden Antrieb eines Werkzeugs (3) mit einem pneumatischen Schlagwerk (4) mit einem in einem Führungsrohr (5) geführten sowie durch eine Luftfeder (6) antreibbaren Flugkolben (7) zum Beaufschlagen eines axial begrenzt beweglichen Döppers (8) für das Werkzeug (3), wobei im Führungsrohr (5) ein viskoelastisches Dämpfungselement (9) angeordnet ist, dadurch gekennzeichnet, dass das Dämpfungselement (9) in eine axial beidseitig begrenzte, umlaufende Radialnut (13) des Döppers (8) eingreift.Hand tool for at least partially striking drive a tool (3) with a pneumatic percussion (4) with a guided in a guide tube (5) and by an air spring (6) driven air piston (7) for acting on an axially limited beatpiece (8) for the tool (3), wherein in the guide tube (5) a viscoelastic damping element (9) is arranged, characterized in that the damping element (9) engages in an axially on both sides limited, circumferential radial groove (13) of the striker (8). Handwerkzeugmaschine nach Anspruch 1, dadurch gekennzeichnet, dass eine axiale Länge (L) der Radialnut (13) des Döppers (8) im Bereich von der Hälfte bis zu dem Doppelten des Durchmessers (D) des Döppers (8) liegt.Hand tool according to claim 1, characterized in that an axial length (L) of the radial groove (13) of the striker (8) in the range of half to twice the diameter (D) of the striker (8). Handwerkzeugmaschine nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Dämpfelement (9) kreisringförmig ausgebildet ist.Powered hand tool according to claim 1 or 2, characterized in that the damping element (9) is annular. Handwerkzeugmaschine nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das Dämpfelement (9) mit seinem radial äusseren Teil in einer Radialinnennut (10) des Führungsrohres (5) angeordnet ist.Powered hand tool according to one of claims 1 to 3, characterized in that the damping element (9) with its radially outer part in a Radialinnennut (10) of the guide tube (5) is arranged. Handwerkzeugmaschine nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das Dämpfungselement (9) aus einem Fluor-Elastomer besteht.Powered hand tool according to one of claims 1 to 4, characterized in that the damping element (9) consists of a fluoro-elastomer.
EP07113295A 2006-08-07 2007-07-27 Hand tool machine with pneumatic striking mechanism Withdrawn EP1886767A3 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006000395A DE102006000395A1 (en) 2006-08-07 2006-08-07 Hand tool with pneumatic percussion

Publications (2)

Publication Number Publication Date
EP1886767A2 true EP1886767A2 (en) 2008-02-13
EP1886767A3 EP1886767A3 (en) 2008-02-27

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ID=38693557

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07113295A Withdrawn EP1886767A3 (en) 2006-08-07 2007-07-27 Hand tool machine with pneumatic striking mechanism

Country Status (3)

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US (1) US20080029283A1 (en)
EP (1) EP1886767A3 (en)
DE (1) DE102006000395A1 (en)

Cited By (2)

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Publication number Priority date Publication date Assignee Title
EP2105260A1 (en) * 2008-03-28 2009-09-30 Makita Corporation Impact tool
EP2254732A1 (en) * 2008-02-20 2010-12-01 Robert Bosch GmbH Handheld machine tool

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US8011547B2 (en) * 2007-10-05 2011-09-06 Senco Brands, Inc. Fastener driving tool using a gas spring
US8763874B2 (en) 2007-10-05 2014-07-01 Senco Brands, Inc. Gas spring fastener driving tool with improved lifter and latch mechanisms
US8636081B2 (en) 2011-12-15 2014-01-28 Milwaukee Electric Tool Corporation Rotary hammer
US20240123589A1 (en) * 2019-11-12 2024-04-18 Hilti Aktiengesellschaft Impact mechanism arrangement
SE545906C2 (en) * 2022-12-09 2024-03-12 Atlas Copco Ind Technique Ab Hand-held percussive tool

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DE2207962A1 (en) * 1972-02-21 1972-08-30 Bosch Gmbh Robert AIR SPRING HAMMER
NL7810416A (en) * 1977-12-21 1979-06-25 Duss Maschf ELECTROPNEUMATIC HAMMER, FITTED WITH A ROCKET FOR THE IMPACT PISTON.
EP0014760A1 (en) * 1979-01-31 1980-09-03 Black & Decker Inc. Idling and air replenishing system for a reciprocating hammer mechanism
DE19933972A1 (en) * 1999-07-20 2001-01-25 Bosch Gmbh Robert Hammer drill or hammer
EP1147861A2 (en) * 2000-04-18 2001-10-24 HILTI Aktiengesellschaft Electric hand tool with idle running switch off
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2254732A1 (en) * 2008-02-20 2010-12-01 Robert Bosch GmbH Handheld machine tool
EP2105260A1 (en) * 2008-03-28 2009-09-30 Makita Corporation Impact tool
US8037947B2 (en) 2008-03-28 2011-10-18 Makita Corporation Impact tool with shock absorbing element

Also Published As

Publication number Publication date
EP1886767A3 (en) 2008-02-27
DE102006000395A1 (en) 2008-02-14
US20080029283A1 (en) 2008-02-07

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