EP2065139A1 - Hand tool machine with pneumatic striking mechanism - Google Patents

Hand tool machine with pneumatic striking mechanism Download PDF

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Publication number
EP2065139A1
EP2065139A1 EP08105745A EP08105745A EP2065139A1 EP 2065139 A1 EP2065139 A1 EP 2065139A1 EP 08105745 A EP08105745 A EP 08105745A EP 08105745 A EP08105745 A EP 08105745A EP 2065139 A1 EP2065139 A1 EP 2065139A1
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EP
European Patent Office
Prior art keywords
hand tool
bore
tool according
piston
powered hand
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.)
Granted
Application number
EP08105745A
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German (de)
French (fr)
Other versions
EP2065139B1 (en
Inventor
James Zhong
Kevin Guo
Rory App. 21A RT2 Britz
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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 refers to a hand-held power tool with a pneumatic percussion mechanism with a reciprocating air piston reciprocated by an air spring, preferably a rotary hammer or chisel hammer.
  • 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 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.
  • 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 simply variable, starting from a uniform raw missile in the form of a solid, starting a bore with impact-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 omitted 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 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.

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

Abstract

The tool (1) has a pneumatic percussion mechanism (2) including a percussion piston (5) reciprocating along a percussion axis (A) with a bore (6) extending at an angle to the percussion axis, and an air spring (4) for displacing the percussion piston. The percussion piston made of steel includes an axial length and half of guide diameter, and an axial end side comprises a radial reduction with a spherical impact surface, where the reduction forms a radial bead adjacent to the impact surface.

Description

Die Erfindung bezeichnet eine Handwerkzeugmaschine mit einem pneumatischen Schlagwerk mit einem durch eine Luftfeder hin- und herbewegten Flugkolben, vorzugsweise einen Bohrhammer oder Meisselhammer.The invention refers to a hand-held power tool with a pneumatic percussion mechanism with a reciprocating air piston reciprocated by an air spring, preferably a rotary hammer or chisel hammer.

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 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 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 simply variable, starting from a uniform raw missile in the form of a solid, starting a bore with impact-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.

Vorteilhaft 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.Advantageously, 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 omitted 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 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 (11)

Handwerkzeugmaschine mit einem pneumatischen Schlagwerk (2) mit einem durch eine Luftfeder (4) längs einer Schlagachse (A) hin- und herbewegbaren Flugkolben (5), dadurch gekennzeichnet, dass der Flugkolben (5) eine Ausbohrung (6) aufweist, die sich in einem Winkel zur Schlagachse (A) erstreckt.Hand tool with a pneumatic percussion (2) with a by an air spring (4) along a striking axis (A) reciprocable air piston (5), characterized in that the flying piston (5) has a bore (6) extending in extends at an angle to the impact axis (A). Handwerkzeugmaschine nach Anspruch 1, dadurch gekennzeichnet, dass der Flugkolben (5) aus Stahl besteht.Powered hand tool according to claim 1, characterized in that the flying mass (5) consists of steel. Handwerkzeugmaschine nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Flugkolben (5) eine axiale Länge (L) aufweist, die im Bereich des einfachen bis eineinhalbfachen seines Führungsdurchmessers (D) liegt.Powered hand tool according to claim 1 or 2, characterized in that the flying piston (5) has an axial length (L) which is in the range of one to one and a half times its guide diameter (D). Handwerkzeugmaschine nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass ein axiales Stirnende als radiale Verjüngung (7) mit einer balligen Schlagfläche (8) ausgebildet ist.Powered hand tool according to one of claims 1 to 3, characterized in that an axial end face as a radial taper (7) is formed with a spherical striking surface (8). Handwerkzeugmaschine nach Anspruch 4, dadurch gekennzeichnet, dass die radiale Verjüngung (7) nahe der Schlagfläche (8) einen Radialwulst (9) ausbildet.Powered hand tool according to claim 4, characterized in that the radial taper (7) near the impact surface (8) forms a radial bead (9). Handwerkzeugmaschine nach Anspruch 4 oder 5, dadurch gekennzeichnet, dass die der Schlagfläche (8) gegenüberliegende Stirnseite (10) des Flugkolbens (5) eben ausgebildet ist.Powered hand tool according to claim 4 or 5, characterized in that the striking surface (8) opposite end face (10) of the flying piston (5) is flat. Handwerkzeugmaschine nach Anspruch 6, dadurch gekennzeichnet, dass zwischen der Stirnseite (10) und der Ausbohrung (6) eine umlaufende Radialnut (11) vorhanden ist.Powered hand tool according to claim 6, characterized in that between the end face (10) and the bore (6) has a circumferential radial groove (11) is present. Handwerkzeugmaschine nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die Ausbohrung (6) zentral zur Schlagachse (A) verläuft.Powered hand tool according to one of claims 1 to 7, characterized in that the bore (6) extends centrally to the impact axis (A). Handwerkzeugmaschine nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass der Bohrungsdurchmesser (B) der Ausbohrung (6) im Bereich von der Hälfte und drei Vierteln des Führungsdurchmessers (D) liegt.Hand tool according to one of claims 1 to 8, characterized in that the bore diameter (B) of the bore (6) in the range of half and three quarters of the guide diameter (D). Handwerkzeugmaschine nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass der Winkel der Ausbohrung (6) zur Schlagachse (A) 90° beträgt.Powered hand tool according to one of claims 1 to 9, characterized in that the angle of the bore (6) to the impact axis (A) is 90 °. Handwerkzeugmaschine nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass die Ausbohrung (6) eine Durchgangsbohrung ist.Hand tool according to one of claims 1 to 10, characterized in that the bore (6) is a through hole.
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 true EP2065139A1 (en) 2009-06-03
EP2065139B1 EP2065139B1 (en) 2017-03-15

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

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US12122030B2 (en) 2020-08-31 2024-10-22 Hilti Aktiengesellschaft Hand-held power tool

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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
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EP4382254A1 (en) 2022-12-07 2024-06-12 Hilti Aktiengesellschaft Striking mechanism for a hand-held electric tool and hand-held electric tool
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US2533487A (en) * 1946-08-15 1950-12-12 Chicago Pneumatic Tool Co Gas hammer
GB659331A (en) * 1949-03-30 1951-10-24 Atlas Diesel Ab Improvements in pressure fluid driven hammer pistons for hammer drills and other percussion tools
US3402776A (en) 1965-05-12 1968-09-24 Evgeny Vsevolodovich Alexandrov Device for impact loading a solid body
DE1809016A1 (en) * 1968-11-15 1970-06-18 Fein C & E Electrically insulated nailer hand tools driven by an electric motor
DE4215288A1 (en) * 1991-07-08 1993-01-14 Bosch Gmbh Robert DRILLING HAMMER
GB2425503A (en) * 2005-04-28 2006-11-01 Bosch Gmbh Robert Hand machine tool striking mechanism unit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103481246A (en) * 2012-06-13 2014-01-01 罗伯特·博世有限公司 Impact mechanism
WO2014122101A1 (en) * 2013-02-07 2014-08-14 Hilti Aktiengesellschaft Machine tool
US12122030B2 (en) 2020-08-31 2024-10-22 Hilti Aktiengesellschaft Hand-held power tool

Also Published As

Publication number Publication date
CN101444909B (en) 2013-03-27
US20090133893A1 (en) 2009-05-28
JP2009125931A (en) 2009-06-11
US7926586B2 (en) 2011-04-19
EP2065139B1 (en) 2017-03-15
JP5584408B2 (en) 2014-09-03
CN101444909A (en) 2009-06-03

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