EP2065139B1 - Hand tool machine with pneumatic striking mechanism - Google Patents
Hand tool machine with pneumatic striking mechanism Download PDFInfo
- 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
Links
- 230000007246 mechanism Effects 0.000 title claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 230000004323 axial length Effects 0.000 claims description 4
- 239000011324 bead Substances 0.000 claims description 3
- 238000009527 percussion Methods 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Images
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
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
Nach der
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
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
-
Fig. 1 schematically as a hand tool in partial longitudinal section -
Fig. 2 as a flying piston in longitudinal section
Nach
Nach
Claims (10)
- 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.
- Hand-held power tool according to claim 1, characterised in that the free piston (5) consists of steel.
- 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).
- 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).
- 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).
- 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.
- 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).
- 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).
- 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°.
- Hand-held power tool according to one of claims 1 to 9, characterised in that the bore hole (6) is a through bore.
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) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE535393C2 (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 |
EP4382254A1 (en) | 2022-12-07 | 2024-06-12 | Hilti Aktiengesellschaft | Striking mechanism for a hand-held electric tool and hand-held electric 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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GB189711793A (en) * | 1897-05-12 | 1898-05-07 | John Warren | An Improved Hub for Cycle and other Wheels. |
DE494775C (en) * | 1928-12-09 | 1930-03-28 | Siemens Schuckertwerke Akt Ges | Device for lubricating mechanically driven impact devices |
US2283292A (en) | 1941-03-20 | 1942-05-19 | Ingersoll Rand Co | Percussive tool |
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 |
DE2449191C2 (en) * | 1974-10-16 | 1988-03-24 | Robert Bosch Gmbh, 7000 Stuttgart | hammer |
JPS5828779Y2 (en) * | 1978-07-15 | 1983-06-23 | 株式会社山田重機 | chisel striking device |
JPS59100670U (en) * | 1982-12-27 | 1984-07-07 | 自動車機器株式会社 | Power steering gear piston |
SE500864C2 (en) * | 1989-10-28 | 1994-09-19 | Berema Atlas Copco Ab | Damping device for percussion |
DE4215288A1 (en) * | 1991-07-08 | 1993-01-14 | Bosch Gmbh Robert | DRILLING HAMMER |
JPH0720274U (en) * | 1993-09-27 | 1995-04-11 | ヨコタ工業株式会社 | Air hammer |
DE19540396A1 (en) * | 1995-10-30 | 1997-05-07 | Hilti Ag | Drilling and / or chiseling device |
JP2001096474A (en) * | 1999-09-28 | 2001-04-10 | Makita Corp | Impact tool |
EP1238759B1 (en) * | 2001-03-07 | 2003-12-17 | Black & Decker Inc. | Hammer |
EP1468789A3 (en) * | 2003-04-17 | 2008-06-04 | BLACK & DECKER INC. | Clutch for rotary power tool and rotary power tool incorporating such clutch |
DE102005019710A1 (en) * | 2005-04-28 | 2006-11-09 | Robert Bosch Gmbh | Hand tools percussion unit |
DE102007000393A1 (en) * | 2007-07-19 | 2009-01-22 | Hilti Aktiengesellschaft | Hand tool with pneumatic percussion |
-
2007
- 2007-11-27 CN CN2007101964165A patent/CN101444909B/en active Active
-
2008
- 2008-11-07 EP EP08105745.7A patent/EP2065139B1/en active Active
- 2008-11-19 US US12/313,485 patent/US7926586B2/en active Active
- 2008-11-25 JP JP2008299556A patent/JP5584408B2/en active Active
Non-Patent Citations (1)
Title |
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None * |
Also Published As
Publication number | Publication date |
---|---|
US7926586B2 (en) | 2011-04-19 |
US20090133893A1 (en) | 2009-05-28 |
CN101444909B (en) | 2013-03-27 |
EP2065139A1 (en) | 2009-06-03 |
JP5584408B2 (en) | 2014-09-03 |
CN101444909A (en) | 2009-06-03 |
JP2009125931A (en) | 2009-06-11 |
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