EP2065139B1 - Hand tool machine with pneumatic striking mechanism - Google Patents

Hand tool machine with pneumatic striking mechanism Download PDF

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Publication number
EP2065139B1
EP2065139B1 EP08105745.7A EP08105745A EP2065139B1 EP 2065139 B1 EP2065139 B1 EP 2065139B1 EP 08105745 A EP08105745 A EP 08105745A EP 2065139 B1 EP2065139 B1 EP 2065139B1
Authority
EP
European Patent Office
Prior art keywords
hand
power tool
held power
tool according
bore
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
EP08105745.7A
Other languages
German (de)
French (fr)
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EP2065139A1 (en
Inventor
James Zhong
Kevin Guo
Rory App. 21A RT2 Britz
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
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Hilti AG
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Publication date
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Publication of EP2065139A1 publication Critical patent/EP2065139A1/en
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Publication of EP2065139B1 publication Critical patent/EP2065139B1/en
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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
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/06—Means for driving the impulse member
    • B25D2211/061—Swash-plate 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
    • B25D2222/00—Materials of the tool or the workpiece
    • B25D2222/21—Metals
    • B25D2222/42—Steel
    • 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
    • B25D2250/391—Use of weights; Weight properties of the tool

Definitions

  • the invention relates to a hand tool with a pneumatic percussion mechanism with a reciprocating by an air spring piston, preferably a hammer drill or chisel hammer, according to the preamble of claim 1 and as from DE 494 775 C known.
  • an electromechanically driven percussion device of a handheld power tool has a reciprocating in a guide tube by an air spring reciprocating piston, which strikes a striker or directly on the front end of a recorded in a tool holder tool.
  • an air spring reciprocating piston For tilt-free axial guidance of the flying piston is usually axially longer than the guide diameter of the guide tube.
  • the flying piston and an optional steel anvil so that the impact pulse generation sufficiently high toughness and strength is given.
  • the flying piston also be made of plastic.
  • US2283292 has a pneumatic percussion of a power hand tool on a reciprocating exciter cylinder, in which mediates an air spring reciprocating a steel piston reciprocated.
  • the flying piston is in the form of a solid body (composed of several pieces of solid cylinders in pieces). For lightweight electric hand tool machines, such a flying piston is too heavy.
  • the task is the realization of a powerful, lightweight hand tool.
  • Another aspect is the technologically simple production of the appropriate air piston.
  • a portable power tool has a pneumatic percussion mechanism with a reciprocating piston which can be moved back and forth along an impact axis by an air spring and which has a bore which extends at an angle to the impact axis.
  • the bore creates a much lighter, holes-containing body given a given axial length and guide diameter from the (original) solid body.
  • This bore can be introduced in a conventionally machined flying piston in the form of a solid body by a technologically simple manufacturing process, in particular by drilling.
  • the mass of the flying mass (with different striking mechanisms) is technologically easily variable, starting from a uniform raw missile in the form of a solid body, a bore is introduced with a hammer-specific bore diameter.
  • the flying piston made of steel, whereby a high load capacity is achieved.
  • the (except for the bore rotationally symmetrical) air piston has an axial length which is in the range of one to one and a half times its guide diameter, whereby the flying piston is well feasible in the guide tube or exciter cylinder.
  • an axial end face is designed as a radial taper with a crowned face, whereby a reflection-poor impact pulse transmission to the striker or impact tool takes place.
  • the radial taper near the impact surface forms a radial bead, whereby in the case of no-flyfall the flying mass can be temporarily locked in a ring-shaped elastic catching device.
  • the impact surface opposite end face of the flying piston is flat, whereby the pressure forces of the air spring act axially on the flying piston.
  • a circumferential radial groove is present between this end face and the bore, whereby an O-ring can be used for airtight guidance.
  • the bore extends centrally to the impact axis, whereby the possible hole depth is maximized.
  • the bore diameter of the bore is in the range of half to three quarters of the guide diameter, whereby a sufficient amount of material and thus mass is cut out with sufficient strength of the flying piston.
  • the angle of the bore to the striking axis is 90 °, whereby the bore is a transverse bore.
  • the bore is a throughbore, thereby maximizing the wellbore volume.
  • FIG. 1 has a tool 13 rotating and hitting driving hand tool 1 in the form of a combi hammer on a pneumatic percussion 2, with a guided inside a exciter cylinder 3 and by an air spring 4 along a striking axis A reciprocating air piston 5, which from a bore 6 in Form of a designed as a through hole transverse bore is interspersed, which extends at right angles to the striking axis A and crosses them.
  • FIG. 2 has the (except for the bore rotationally symmetrical) air piston 5 made of steel on an axial length L, which is 1.5 times its guide diameter D.
  • An axial end face is designed as a radial taper 7 with a crowned face 8 and a radial bead 9 close to it.
  • the impact surface 8 opposite end face 10 of the flying piston 5 is flat.

Landscapes

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

Description

Die Erfindung bezeichnet eine Handwerkzeugmaschine mit einem pneumatischen Schlagwerk mit einem durch eine Luftfeder hin- und herbewegten Flugkolben, vorzugsweise einen Bohrhammer oder Meisselhammer, nach dem Oberbegriff von Anspruch 1 und wie aus DE 494 775 C bekannt.The invention relates to a hand tool with a pneumatic percussion mechanism with a reciprocating by an air spring piston, preferably a hammer drill or chisel hammer, according to the preamble of claim 1 and as from DE 494 775 C known.

Üblicherweise weist ein elektromechanisch angetriebenes Schlagwerk einer Handwerkzeugmaschine einen, in einem Führungsrohr durch eine Luftfeder hin- und herbewegten Flugkolben auf, welcher über einen Döpper oder direkt auf das Stirnende eines in einer Werkzeugaufnahme aufgenommenen Werkzeugs schlägt. Zur verkantungsfreien axialen Führung ist der Flugkolben zumeist axial länger als der Führungsdurchmesser des Führungsrohrs.Usually, an electromechanically driven percussion device of a handheld power tool has a reciprocating in a guide tube by an air spring reciprocating piston, which strikes a striker or directly on the front end of a recorded in a tool holder tool. For tilt-free axial guidance of the flying piston is usually axially longer than the guide diameter of the guide tube.

Üblicherweise bestehen der Flugkolben und ein optionaler Döpper aus Stahl, damit die zur Schlagimpulserzeugung hinreichend hohe Zähigkeit und Festigkeit gegeben ist. Jedoch kann bspw. nach der US3402776 der Flugkolben auch aus Kunststoff ausgebildet sein.Usually, the flying piston and an optional steel anvil, so that the impact pulse generation sufficiently high toughness and strength is given. However, for example, after the US3402776 the flying piston also be made of plastic.

Nach der US2283292 weist ein pneumatisches Schlagwerk einer Elektrohandwerkzeugmaschine einen hin- und herbewegten Erregerzylinder auf, in dem vermittelt über eine Luftfeder ein Flugkolben aus Stahl hin- und herbewegt wird. Der Flugkolben hat die Form eines (aus mehreren Vollzylinderstücken stückweise zusammengesetzten) Vollkörpers. Für leichtgewichtige Elektrohandwerkzeugmaschinen ist ein derartiger Flugkolben zu schwer.After US2283292 has a pneumatic percussion of a power hand tool on a reciprocating exciter cylinder, in which mediates an air spring reciprocating a steel piston reciprocated. The flying piston is in the form of a solid body (composed of several pieces of solid cylinders in pieces). For lightweight electric hand tool machines, such a flying piston is too heavy.

Die Aufgabe besteht in der Realisierung einer leistungsstarken, leichtgewichtigen Handwerkzeugmaschine. Ein weiterer Aspekt besteht in der technologisch einfachen Herstellung des dafür geeigneten Flugkolbens.The task is the realization of a powerful, lightweight hand tool. Another aspect is the technologically simple production of the appropriate air piston.

Die Aufgabe wird durch eine Handwerkzeugmaschine mit den Merkmalen des Anspruchs 1 gelöst. Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen.The object is achieved by a hand tool with the features of claim 1. Advantageous developments emerge from the subclaims.

So weist eine Handwerkzeugmaschine ein pneumatisches Schlagwerk mit einem durch eine Luftfeder längs einer Schlagachse hin- und herbewegbaren Flugkolben auf, welcher eine Ausbohrung aufweist, die sich in einem Winkel zur Schlagachse erstreckt.Thus, a portable power tool has a pneumatic percussion mechanism with a reciprocating piston which can be moved back and forth along an impact axis by an air spring and which has a bore which extends at an angle to the impact axis.

Durch die Ausbohrung entsteht bei gegebener axialer Länge und Führungsdurchmesser aus dem (ursprünglichen) Vollkörper ein wesentlich leichterer, Löcher aufweisender Körper. Diese Ausbohrung ist in einem üblicherweise spanend gefertigten Flugkolben in Form eines Vollkörpers durch einen technologisch einfachen Herstellungsprozess einbringbar, insbesondere durch Ausbohren. Zudem ist die Masse des Flugkolbens (bei unterschiedlichen Schlagwerken) technologisch einfach variabel, indem von einem einheitlichen Rohflugkörper in Form eines Vollköpers ausgehend, eine Ausbohrung mit schlagwerksspezifischem Bohrungsdurchmesser eingebracht wird.The bore creates a much lighter, holes-containing body given a given axial length and guide diameter from the (original) solid body. This bore can be introduced in a conventionally machined flying piston in the form of a solid body by a technologically simple manufacturing process, in particular by drilling. In addition, the mass of the flying mass (with different striking mechanisms) is technologically easily variable, starting from a uniform raw missile in the form of a solid body, a bore is introduced with a hammer-specific bore diameter.

Vorteilhaft besteht der Flugkolben aus Stahl, wodurch eine hohe Belastbarkeit erzielt wird.Advantageously, the flying piston made of steel, whereby a high load capacity is achieved.

Vorteilhaft weist der (bis auf die Ausbohrung rotationssymmetrische) Flugkolben eine axiale Länge auf, die im Bereich des einfachen bis eineinhalbfachen seines Führungsdurchmessers liegt, wodurch der Flugkolben gut im Führungsrohr bzw. Erregerzylinder führbar ist.Advantageously, the (except for the bore rotationally symmetrical) air piston has an axial length which is in the range of one to one and a half times its guide diameter, whereby the flying piston is well feasible in the guide tube or exciter cylinder.

Vorteilhaft ist ein axiales Stirnende als radiale Verjüngung mit einer balligen Schlagfläche ausgebildet, wodurch eine reflexionsarme Schlagimpulsübertragung zum Döpper bzw. Schlagwerkzeug erfolgt.Advantageously, an axial end face is designed as a radial taper with a crowned face, whereby a reflection-poor impact pulse transmission to the striker or impact tool takes place.

Vorteilhaft bildet die radiale Verjüngung nahe der Schlagfläche einen Radialwulst aus, wodurch im Leerschlagfall der Flugkolben in einer ringförmig elastischen Fangvorrichtung temporär arretierbar ist.Advantageously, the radial taper near the impact surface forms a radial bead, whereby in the case of no-flyfall the flying mass can be temporarily locked in a ring-shaped elastic catching device.

Vorteilhaft ist die der Schlagfläche gegenüberliegende Stirnseite des Flugkolbens eben ausgebildet, wodurch die Druckkräfte der Luftfeder axial auf den Flugkolben wirken.Advantageously, the impact surface opposite end face of the flying piston is flat, whereby the pressure forces of the air spring act axially on the flying piston.

Vorteilhaft ist zwischen dieser Stirnseite und der Ausbohrung eine umlaufende Radialnut vorhanden, wodurch ein O-Ring zur luftdichten Führung einsetzbar ist.Advantageously, a circumferential radial groove is present between this end face and the bore, whereby an O-ring can be used for airtight guidance.

Vorteilhaft verläuft die Ausbohrung zentral zur Schlagachse, wodurch die mögliche Bohrlochtiefe maximiert ist.Advantageously, the bore extends centrally to the impact axis, whereby the possible hole depth is maximized.

Erfindungsgemäß liegt der Bohrungsdurchmesser der Ausbohrung im Bereich von der Hälfte bis zu drei Vierteln des Führungsdurchmessers, wodurch bei hinreichender Festigkeit des Flugkolbens viel Material und dadurch Masse ausgespart wird.According to the invention, the bore diameter of the bore is in the range of half to three quarters of the guide diameter, whereby a sufficient amount of material and thus mass is cut out with sufficient strength of the flying piston.

Vorteilhaft beträgt der Winkel der Ausbohrung zur Schlagachse 90°, wodurch die Ausbohrung eine Querbohrung ist.Advantageously, the angle of the bore to the striking axis is 90 °, whereby the bore is a transverse bore.

Vorteilhaft ist die Ausbohrung eine Durchgangsbohrung, wodurch das Bohrlochvolumen maximiert ist.Advantageously, the bore is a throughbore, thereby maximizing the wellbore volume.

Die Erfindung wird bezüglich eines vorteilhaften Ausführungsbeispiels näher erläutert mit:

  • Fig. 1 schematisch als Handwerkzeugmaschine im Teillängsschnitt
  • Fig. 2 als Flugkolben im Längsschnitt
The invention will be explained in more detail with respect to an advantageous embodiment with:
  • Fig. 1 schematically as a hand tool in partial longitudinal section
  • Fig. 2 as a flying piston in longitudinal section

Nach Fig. 1 weist eine ein Werkzeug 13 drehend und schlagend antreibende Handwerkzeugmaschine 1 in Form eines Kombihammers ein pneumatisches Schlagwerk 2 auf, mit einem innerhalb eines Erregerzylinders 3 geführten und durch eine Luftfeder 4 längs einer Schlagachse A hin- und herbewegten Flugkolben 5, welcher von einer Ausbohrung 6 in Form einer als Durchgangsbohrung ausgeführten Querbohrung durchsetzt ist, die sich im rechten Winkel zur Schlagachse A erstreckt und diese kreuzt.To Fig. 1 has a tool 13 rotating and hitting driving hand tool 1 in the form of a combi hammer on a pneumatic percussion 2, with a guided inside a exciter cylinder 3 and by an air spring 4 along a striking axis A reciprocating air piston 5, which from a bore 6 in Form of a designed as a through hole transverse bore is interspersed, which extends at right angles to the striking axis A and crosses them.

Nach Fig. 2 weist der (bis auf die Ausbohrung rotationssymmetrische) Flugkolben 5 aus Stahl eine axiale Länge L auf, die bei dem 1.5-fachen seines Führungsdurchmessers D liegt. Ein axiales Stirnende ist als radiale Verjüngung 7 mit einer balligen Schlagfläche 8 und einer zu dieser nahen Radialwulst 9 ausgebildet. Die der Schlagfläche 8 gegenüberliegende Stirnseite 10 des Flugkolbens 5 ist eben ausgebildet. Zwischen dieser Stirnseite 10 und der zur Schlagachse A senkrechten sowie zentralen Ausbohrung 6 mit einem Bohrungsdurchmesser B von der Hälfte des Führungsdurchmessers D (Durchmesser des geführten Bereiches) ist eine umlaufende Radialnut 11 vorhanden, in welcher ein O-Ring 12 aus Gummi eingesetzt ist.To Fig. 2 has the (except for the bore rotationally symmetrical) air piston 5 made of steel on an axial length L, which is 1.5 times its guide diameter D. An axial end face is designed as a radial taper 7 with a crowned face 8 and a radial bead 9 close to it. The impact surface 8 opposite end face 10 of the flying piston 5 is flat. Between this end face 10 and the central bore 6, which is perpendicular to the striking axis A and having a bore diameter B of half the guide diameter D (diameter of the guided area), there is a circumferential radial groove 11, in which an O-ring 12 made of rubber is inserted.

Claims (10)

  1. Hand-held power tool comprising a pneumatic striking mechanism (2) with a free piston (5) that can be reciprocated along a striking axis (A) in a guide tube of the hand-held power tool by means of an air spring (4), the free piston (5) having a bore hole (6) extending at an angle to the striking axis (A), characterised in that the bore diameter (B) of the bore hole (6) is in the range of half to three-quarters of the guide diameter (D) of the guide tube.
  2. Hand-held power tool according to claim 1, characterised in that the free piston (5) consists of steel.
  3. Hand-held power tool according to claim 1 or claim 2, characterised in that the free piston (5) has an axial length (L) in the range of one to one and a half times its guide diameter (D).
  4. Hand-held power tool according to one of claims 1 to 3, characterised in that one axial end is designed as a radial taper (7) with a spherical impact surface (8).
  5. Hand-held power tool according to claim 4, characterised in that the radial taper (7) forms a radial bead (9) close to the impact surface (8).
  6. Hand-held power tool according to claim 4 or claim 5, characterised in that the end face (10) of the free piston (5) opposite the impact surface (8) is flat.
  7. Hand-held power tool according to claim 6, characterised by a circumferential radial groove (11) between the end face (10) and the bore hole (6).
  8. Hand-held power tool according to one of claims 1 to 7, characterised in that the bore hole (6) extends centrally relative to the striking axis (A).
  9. Hand-held power tool according to one of claims 1 to 8, characterised in that the angle of the bore hole (6) relative to the striking axis (A) is 90°.
  10. Hand-held power tool according to one of claims 1 to 9, characterised in that the bore hole (6) is a through bore.
EP08105745.7A 2007-11-27 2008-11-07 Hand tool machine with pneumatic striking mechanism Active EP2065139B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2007101964165A CN101444909B (en) 2007-11-27 2007-11-27 Hand-held tool machine with pneumatic impacting device

Publications (2)

Publication Number Publication Date
EP2065139A1 EP2065139A1 (en) 2009-06-03
EP2065139B1 true EP2065139B1 (en) 2017-03-15

Family

ID=40457349

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08105745.7A Active EP2065139B1 (en) 2007-11-27 2008-11-07 Hand tool machine with pneumatic striking mechanism

Country Status (4)

Country Link
US (1) US7926586B2 (en)
EP (1) EP2065139B1 (en)
JP (1) JP5584408B2 (en)
CN (1) CN101444909B (en)

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SE1150383A1 (en) 2011-05-03 2012-07-24 Atlas Copco Rock Drills Ab A stroke transfer part, and a drill comprising such a stroke transfer part
DE102011075765A1 (en) 2011-05-12 2012-11-15 Hilti Aktiengesellschaft Hand tool
JP2013151055A (en) * 2012-01-26 2013-08-08 Makita Corp Striking tool
DE102012209875A1 (en) * 2012-06-13 2013-12-19 Robert Bosch Gmbh striking mechanism
DE102013202000A1 (en) * 2013-02-07 2014-08-07 Hilti Aktiengesellschaft machine tool
EP2910336A1 (en) * 2014-02-21 2015-08-26 HILTI Aktiengesellschaft Power tool
DE102017209829A1 (en) * 2017-06-12 2018-12-13 Robert Bosch Gmbh Hand tool
CN107627263B (en) * 2017-09-30 2023-11-10 苏州宝时得电动工具有限公司 Electric hammer
CN110125454B (en) * 2019-06-17 2021-07-30 上海同叶应用技术发展中心 Robot for mining and surveying
JP7412135B2 (en) * 2019-11-05 2024-01-12 株式会社マキタ impact tool
CN116220540A (en) * 2023-03-06 2023-06-06 徐州徐工基础工程机械有限公司 Impact part and impact mechanism

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Also Published As

Publication number Publication date
CN101444909B (en) 2013-03-27
JP2009125931A (en) 2009-06-11
US7926586B2 (en) 2011-04-19
CN101444909A (en) 2009-06-03
EP2065139A1 (en) 2009-06-03
US20090133893A1 (en) 2009-05-28
JP5584408B2 (en) 2014-09-03

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