EP0876880B1 - Drill- and/or percussion apparatus - Google Patents
Drill- and/or percussion apparatus Download PDFInfo
- Publication number
- EP0876880B1 EP0876880B1 EP98810142A EP98810142A EP0876880B1 EP 0876880 B1 EP0876880 B1 EP 0876880B1 EP 98810142 A EP98810142 A EP 98810142A EP 98810142 A EP98810142 A EP 98810142A EP 0876880 B1 EP0876880 B1 EP 0876880B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- guide tube
- air passages
- piston
- air
- striker
- 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.)
- Expired - Lifetime
Links
- 238000009527 percussion Methods 0.000 title description 3
- 238000003754 machining Methods 0.000 claims description 14
- 238000005553 drilling Methods 0.000 claims description 8
- 238000003825 pressing Methods 0.000 description 9
- 238000009423 ventilation Methods 0.000 description 9
- 238000006073 displacement reaction Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Images
Classifications
-
- 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
- B25D11/06—Means for driving the impulse member
- B25D11/12—Means for driving the impulse member comprising a crank mechanism
- B25D11/125—Means for driving the impulse member comprising a crank mechanism with a fluid cushion between the crank drive and the striking body
-
- 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
Definitions
- the invention relates to a drilling and / or chiseling device according to the preamble of patent claim 1.
- a chisel device which has a guide tube in which a piston of a percussion mechanism and a club cooperating with a striker are arranged axially displaceable. Between the piston and the racket, the guide tube has a plurality of radially extending air passages distributed along a plane extending perpendicular to the machining direction over the circumference, which can be covered by a control body that can be displaced axially back and forth relative to the guide tube.
- the control body is in the form of a sleeve and surrounds the guide tube.
- the latter In the end region of the free end of the control body pointing counter to the machining direction, the latter has a plurality of radially extending ventilation openings which are distributed over the circumference in a plane running perpendicular to the machining direction.
- the ventilation openings are arranged on the control body such that they can be brought into coincidence with the air passages when a back and forth displacement of the control body relative to the guide tube takes place.
- the cross-sectional area of each ventilation hole corresponds substantially to half the cross-sectional area of each air passage of the guide tube.
- the device To machine a substrate, the device must be pressed against it.
- the device is supported by the chisel tool on the ground.
- a displacement of the chisel tool, the striker and the control body takes place counter to the machining direction relative to the device. In this case, the control body occupies three different positions.
- control body Before pressing the device against the ground, the control body relative to the guide tube in the machining direction is offset so far that the air passages are not closed by the control body.
- the ventilation openings cover the air passages of the guide tube.
- the interior of the guide tube is vented between the racket and the piston via the small vents, a low pressure air cushion can be built up sufficient to move the racket at a slower speed in the machine direction.
- a hammer drill with a percussion mechanism which has in a guide cylinder a piston which can be driven by a motor, a beater and an anvil. Between the piston and the racket, a first air chamber and between the racket and the striker a second air chamber is formed. In this case, six ventilation openings are arranged between the piston and the racket in the region of the first air chamber and six further ventilation openings in the region of the second air chamber between the racket and the striker in the wall of the guide cylinder.
- the invention has for its object to provide a drilling and / or chiselling device that is economical and easy to manufacture, has a long life and in which the contamination of the interior of the guide tube is prevented.
- a drilling and / or chiseling device which has the features listed in the characterizing portion of claim 1.
- a drilling and / or chiseling device which has the features listed in the characterizing portion of claim 1.
- By arranging further air passages between the piston and the racket it is possible to make the cross-sectional areas of the individual air outlets very small in order to effectively prevent the penetration of drilling dust or dirt particles into the interior of the guide tube.
- Via the further air outlets a slight ventilation of the interior of the guide tube is achieved when the device is in a first contact position and the air passages are closed by the control.
- the interior of the guide tube is slightly ventilated by the other air passages, is the construction of an air cushion possible, by means of which the racket can be set back and forth at a slow speed.
- the pressure of the air cushion which can be built up in the first contact pressure substantially corresponds to half the pressure of that air cushion which can be built up in a second contact pressure position
- a plurality of further air passages are distributed over the circumference in each case along the further levels.
- the racket is slowly accelerated and when lifting the device from the machined surface reduces the speed with which the racket is set back and forth.
- the other air outlets are distributed uniformly over the respective circumference of the guide tube.
- a further reduction in the cross sections of the air passages and the further air outlets can be achieved by connecting to the first level several further levels opposite to the processing direction, along which a plurality of further air outlets are distributed over the circumference. Closing of these further air passages in the other levels is also carried out by the displaceable by the striker control body.
- the drilling and / or chiseling device shown schematically in FIG. 1 comprises a housing 1 with a handle 3, a switch 4, a tool holder 2 for a tool, not shown, and an electric cable 5, via which the device can be connected to an external power source is.
- FIGS. 2 to 4 In the interior of the drilling and / or chiseling device is shown in FIGS. 2 to 4 extending parallel to the machining direction guide tube 9 with pointing in the machine direction first free end and the first free end opposite the second free end.
- the piston 7 of a striking mechanism 6, not shown In the guide tube 9, the piston 7 of a striking mechanism 6, not shown, is arranged axially displaceable.
- the piston 7 is connected via a bolt 8 with a connecting rod in connection, which projects beyond the second free end of the guide tube 9 against the machining direction.
- the guide tube 9 has a plurality of radially extending air passages 10 and a plurality of radially extending further air passages 11 which are arranged between the piston 7 and the racket 19 and via which the pressure of the air cushion can be influenced.
- the air passages 10 are along the periphery of a first plane E1 and the air passages 11 are distributed along the periphery of another plane E2, which is spaced from the first plane E1 counter to the machining direction.
- the control of the air passages 10 and the other air passages 11 by means of a control body, which is opposite to the guide tube 9 of the striker 17 against the processing direction and displaceable by a spring 12 in the machine direction.
- the striker 17 is guided in an anvil guide 18 which axially with the guide tube. 9 communicates.
- the spring 12 surrounds the guide tube 9 on the outside and is supported on a stop edge of the housing 1 and a counter to the machining direction facing support surface of the shift sleeve 13 from.
- the control body is formed by a shift fork 15, a shift rod 14 and a shift sleeve 13.
- the shift fork 15 cooperates in the interior of the guide tube 9 with the striker 17 and interspersed with their opposite free ends diametrically opposite openings 16 of the guide tube 9.
- the free A portion of the shift rod 14 is semicircular in shape and protrudes into a circumferentially formed recess of the shift sleeve 13.
- the two free ends of the shift rod 14 extend in the machine direction and embrace the form-fitting two free ends of the shift fork 15th
- Fig. 2 shows the control body in its normal position.
- the device is not in a pressed position.
- the at a distance A from each other arranged air outlets 10 and the other air passages 11 are open. Over all air outlets 10, 11, such a strong ventilation of the interior of the guide tube 9 is achieved, so that the piston 7 can build up no air cushion and the racket 19 can move in the machine direction.
- Fig. 3 shows the control body in a first pressing position, which is achieved when pressed against the device to be machined, not shown, for example, after half the Anpressweg.
- the occurring during pressing displacement of the striker 17 against the machining direction also causes a displacement of the control body in the same direction.
- the shift sleeve 13 of the control body covers all the air passages 10. Only the other air outlets 11 are open. From the piston 7, an air cushion can be constructed with a low pressure. The pressure of this air cushion is sufficient to move the racket 19 at a slow speed in the machine direction.
- Fig. 4 shows the control body in a further pressing position, which is achieved after the complete pressing of the device against the substrate to be processed.
- the shift sleeve 13 of the control body covers all the air outlets 10 and all other air passages 11.
- the interior of the guide tube 9 is no longer ventilated.
- an air cushion can be constructed, with which the racket 19 can be displaced at a high speed in the machining direction.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
- Percussive Tools And Related Accessories (AREA)
Description
Die Erfindung betrifft ein Bohr- und/oder Meisselgerät gemäss dem Oberbegriff des Patentanspruchs 1.The invention relates to a drilling and / or chiseling device according to the preamble of patent claim 1.
Aus der DE-OS 39 32 134 ist ein Meisselgerät bekannt, das ein Führungsrohr aufweist, in dem ein Kolben eines Schlagwerks und ein mit einem Döpper zusammenwirkender Schläger axial versetzbar angeordnet sind. Zwischen dem Kolben und dem Schläger weist das Führungsrohr mehrere entlang einer senkrecht zur Bearbeitungsrichtung verlaufenden Ebene über den Umfang verteilte, radial verlaufende Luftdurchlässe auf, die von einem gegenüber dem Führungsrohr axial hin- und herversetzbaren Steuerkörper abdeckbar sind.From DE-OS 39 32 134 a chisel device is known which has a guide tube in which a piston of a percussion mechanism and a club cooperating with a striker are arranged axially displaceable. Between the piston and the racket, the guide tube has a plurality of radially extending air passages distributed along a plane extending perpendicular to the machining direction over the circumference, which can be covered by a control body that can be displaced axially back and forth relative to the guide tube.
Der Steuerkörper ist in Form einer Hülse ausgebildet und umgibt das Führungsrohr. Im Endbereich des entgegen der Bearbeitungsrichtung weisenden, freien Endes des Steuerkörpers weist dieser mehrere radial verlaufende Belüftungsöffnungen auf, die in einer senkrecht zur Bearbeitungsrichtung verlaufenden Ebene über den Umfang verteilt sind. Die Belüftungsöffnungen sind derart an dem Steuerkörper angeordnet, dass sie in Überdeckung mit den Luftdurchlässen gebracht werden können, wenn eine Hin und Herversetzung des Steuerkörpers gegenüber dem Führungsrohr erfolgt. Die Querschnittsfläche jeder Belüftungsbohrung entspricht im wesentlichen der halben Querschnittsfläche jedes Luftdurchlasses des Führungsrohres.The control body is in the form of a sleeve and surrounds the guide tube. In the end region of the free end of the control body pointing counter to the machining direction, the latter has a plurality of radially extending ventilation openings which are distributed over the circumference in a plane running perpendicular to the machining direction. The ventilation openings are arranged on the control body such that they can be brought into coincidence with the air passages when a back and forth displacement of the control body relative to the guide tube takes place. The cross-sectional area of each ventilation hole corresponds substantially to half the cross-sectional area of each air passage of the guide tube.
Zur Bearbeitung eines Untergrundes muss das Gerät gegen diesen gedrückt werden. Das Gerät stützt sich dabei über das Meisselwerkzeug an dem Untergrund ab. Beim Anpressvorgang erfolgt eine Verschiebung des Meisselwerkzeuges, des Döppers und des Steuerkörpers entgegen der Bearbeitungsrichtung gegenüber dem Gerät. Dabei nimmt der Steuerkörper drei verschiedene Stellungen ein.To machine a substrate, the device must be pressed against it. The device is supported by the chisel tool on the ground. During the pressing process, a displacement of the chisel tool, the striker and the control body takes place counter to the machining direction relative to the device. In this case, the control body occupies three different positions.
Vor dem Anpressen des Geräts gegen den Untergrund ist der Steuerkörper gegenüber dem Führungsrohr in Bearbeitungsrichtung derart weit versetzt, dass die Luftdurchlässe von dem Steuerkörper nicht verschlossen sind.Before pressing the device against the ground, the control body relative to the guide tube in the machining direction is offset so far that the air passages are not closed by the control body.
In einer ersten Anpressstellung überdecken die Belüftungsöffnungen die Luftdurchlässe des Führungsrohres. Obwohl der Innenraum des Führungsrohres zwischen dem Schläger und dem Kolben über die kleinen Belüftungsöffnungen belüftet wird, lässt sich ein einen geringen Druck aufweisendes Luftpolster aufbauen, das ausreicht um den Schläger mit einer geringen Geschwindigkeit in Bearbeitungsrichtung zu versetzen.In a first pressing position, the ventilation openings cover the air passages of the guide tube. Although the interior of the guide tube is vented between the racket and the piston via the small vents, a low pressure air cushion can be built up sufficient to move the racket at a slower speed in the machine direction.
In einer zweiten Anpressstellung werden die Luftdurchlässe von dem Steuerkörper vollständig abgedeckt. Zwischen dem Schläger und dem Kolben kann sich ein Luftpolster mit einem hohen Druck aufbauen, mit dessen Hilfe der Schläger mit einer hohen Geschwindigkeit in Bearbeitungsrichtung versetzbar ist.In a second pressing position, the air passages are completely covered by the control body. Between the racket and the piston, an air cushion can build up at a high pressure, with the aid of which the racket is displaceable in the machine direction at a high speed.
Beim Transport des Geräts kann Bohrklein oder sonstige Schmutzpartikel, die sich im äusseren Umfangsbereich des Führungsrohres angesammelt haben, losgeschlagen werden und durch die offenen Luftdurchlässe in den Innenraum des Führungsrohres gelangen. Dieses Bohrklein bzw. diese Schmutzpartikel können bei einer weiteren Inbetriebnahme des Geräts zu einer Beschädigung des Schlägers, des Kolbens oder der Innenwandung des Führungsrohres führen.When transporting the device cuttings or other dirt particles that have accumulated in the outer peripheral region of the guide tube can be hit and get through the open air passages into the interior of the guide tube. This drill cuttings or these dirt particles can lead to damage of the racket, the piston or the inner wall of the guide tube in a further commissioning of the device.
Aus der EP 0 759 341 A1 ist ein Bohrhammer mit einem Schlagwerk bekannt, das in einem Führungszylinder einen über einen Motor antreibbaren Kolben, einen Schläger und einen Döpper aufweist. Zwischen dem Kolben und dem Schläger ist eine erste Luftkammer und zwischen dem Schläger und dem Döpper eine zweite Luftkammer ausgebildet. Dabei sind sechs Lüftungsöffnungen zwischen dem Kolben und dem Schläger im Bereich der ersten Luftkammer angeordnet sowie sechs weitere Lüftungsöffnungen im Bereich der zweiten Luftkammer zwischen dem Schläger und dem Döpper in der Wand des Führungszylinders.From EP 0 759 341 A1 a hammer drill with a percussion mechanism is known which has in a guide cylinder a piston which can be driven by a motor, a beater and an anvil. Between the piston and the racket, a first air chamber and between the racket and the striker a second air chamber is formed. In this case, six ventilation openings are arranged between the piston and the racket in the region of the first air chamber and six further ventilation openings in the region of the second air chamber between the racket and the striker in the wall of the guide cylinder.
Der Erfindung liegt die Aufgabe zugrunde, ein Bohr- und/oder Meisselgerät zu schaffen, das wirtschaftlich und einfach herstellbar ist, eine lange Lebensdauer aufweist und bei dem die Verschmutzung des Innenraumes des Führungsrohres verhindert wird.The invention has for its object to provide a drilling and / or chiselling device that is economical and easy to manufacture, has a long life and in which the contamination of the interior of the guide tube is prevented.
Die Lösung dieser Aufgabe erfolgt durch ein Bohr- und/oder Meisselgerät, welches die im kennzeichnenden Abschnitt des Patentanspruchs 1 angeführten Merkmale aufweist. Durch die Anordnung weiterer Luftdurchlässe zwischen dem Kolben und dem Schläger ist es möglich, die Querschnittsflächen der einzelnen Luftdurchlässe sehr klein auszubilden, um das Eindringen von Bohrstaub oder Schmutzpartikeln in den Innenraum des Führungsrohres wirksam zu verhindern. Über die weiteren Luftdurchlässe wird auch eine geringe Belüftung des Innenraumes des Führungsrohres erreicht, wenn sich das Gerät in einer ersten Anpressstellung befindet und die Luftdurchlässe von dem Steuerelement verschlossen sind. Obwohl der Innenraum des Führungsrohres durch die weiteren Luftdurchlässe schwach belüftet wird, ist der Aufbau eines Luftpolsters möglich, durch das der Schläger mit einer langsamen Geschwindigkeit hin- und herversetzt werden kann.
Damit der Druck des in der ersten Anpressstellung aufbaubaren Luftpolsters im wesentlichen der Hälfte des Druckes jenes Luftpolsters entspricht, das in einer zweiten Anpressstellung aufbaubar ist, sind vorzusgsweise entlang der weiteren Ebenen jeweils mehrere weitere Luftdurchlässe über den Umfang verteilt. Insbesondere bei der Inbetriebnahme des Gerätes wird der Schläger langsam beschleunigt und beim Abheben des Gerätes von dem bearbeiteten Untergrund verringert sich die Geschwindigkeit, mit der der Schläger hin- und herversetzt wird.The solution of this object is achieved by a drilling and / or chiseling device, which has the features listed in the characterizing portion of claim 1. By arranging further air passages between the piston and the racket, it is possible to make the cross-sectional areas of the individual air outlets very small in order to effectively prevent the penetration of drilling dust or dirt particles into the interior of the guide tube. Via the further air outlets, a slight ventilation of the interior of the guide tube is achieved when the device is in a first contact position and the air passages are closed by the control. Although the interior of the guide tube is slightly ventilated by the other air passages, is the construction of an air cushion possible, by means of which the racket can be set back and forth at a slow speed.
So that the pressure of the air cushion which can be built up in the first contact pressure substantially corresponds to half the pressure of that air cushion which can be built up in a second contact pressure position, a plurality of further air passages are distributed over the circumference in each case along the further levels. In particular, when starting up the device, the racket is slowly accelerated and when lifting the device from the machined surface reduces the speed with which the racket is set back and forth.
Aus herstelltechnischen Gründen sind vorteilhafterweise die weiteren Luftdurchlässe gleichmässig über den jeweiligen Umfang des Führungsrohres verteilt.For manufacturing reasons, advantageously the other air outlets are distributed uniformly over the respective circumference of the guide tube.
Um eine gleichmässige Belüftung des Innenraumes des Führungsrohres durch die weiteren Luftdurchlässe erreichen zu können, weisen vorzugsweise alle weiteren Luftdurchlässe gleiche Querschnitte auf.In order to achieve a uniform ventilation of the interior of the guide tube through the other air passages, preferably all other air passages on the same cross-sections.
Damit Bohrklein oder sonstige Schmutzpartikel weder durch die Luftdurchlässe noch durch die weiteren Luftdurchlässe in den Innenraum des Führungsrohres gelangen können, entspricht zweckmässigerweise der Querschnitt jedes weiteren Luftdurchlasses im wesentlichen dem Querschnitt jedes Luftdurchlasses.So that cuttings or other dirt particles can not get through the air passages through the other air passages into the interior of the guide tube, suitably corresponds to the cross section of each further air passage substantially the cross section of each air passage.
Eine weitere Verringerung der Querschnitte der Luftdurchlässe und der weiteren Luftdurchlässe kann dadurch erreicht werden, dass sich entgegen der Bearbeitungsrichtung an die erste Ebene mehrere weitere Ebenen anschliessen, entlang denen mehrere weitere Luftdurchlässe über den Umfang verteilt sind. Ein Verschliessen dieser weiteren Luftdurchlässe in den weiteren Ebenen erfolgt ebenfalls durch den von dem Döpper versetzbaren Steuerkörper.A further reduction in the cross sections of the air passages and the further air outlets can be achieved by connecting to the first level several further levels opposite to the processing direction, along which a plurality of further air outlets are distributed over the circumference. Closing of these further air passages in the other levels is also carried out by the displaceable by the striker control body.
Die Erfindung wird anhand von Zeichnungen, die ein Ausführungsbeispiel wiedergeben, näher erläutert. Es zeigen:
- Fig. 1
- ein erfindungsgemässes, schematisch dargestelltes Bohr- und/oder Meisselgerät ohne Werkzeug;
- Fig. 2
- einen Teil des Führungsrohrs des Geräts der Fig. 1 mit sich in einer Grundstellung befindlichem Steuerkörper; in geschnittener Darstellung;
- Fig. 3
- einen Teil des Führungsrohres des Geräts gemäss Fig. 1 in einer ersten Anpressstellung; in geschnittener Darstellung;
- Fig. 4
- einen Teil des Führungsrohres des Geräts gemäss Fig. 1 in einer weiteren Anpressstellung, in geschnittener Darstellung.
- Fig. 1
- an inventive, schematically illustrated drilling and / or chiseling tool without tools;
- Fig. 2
- a part of the guide tube of the device of Figure 1 with befindlichem in a basic position control body. in a sectional view;
- Fig. 3
- a part of the guide tube of the device according to FIG. 1 in a first contact pressure position; in a sectional view;
- Fig. 4
- a part of the guide tube of the device according to FIG. 1 in a further pressing position, in a sectional view.
Das in der Fig. 1 schematisch dargestellte Bohr- und/oder Meisselgerät weist ein Gehäuse 1 mit einem Handgriff 3, einen Schalter 4, eine Werkzeugaufnahme 2 für ein nicht dargestelltes Werkzeug und ein Elektrokabel 5 auf, über das das Gerät mit einer extemen Stromquelle verbindbar ist.The drilling and / or chiseling device shown schematically in FIG. 1 comprises a housing 1 with a
Im Innem des Bohr- und/oder Meisselgerätes befindet sich gemäss den Fig. 2 bis 4 ein sich parallel zur Bearbeitungsrichtung erstreckendes Führungsrohr 9 mit einem in Bearbeitungsrichtung weisenden ersten freien Ende und einem dem ersten freien Ende gegenüberliegenden zweiten freien Ende. Im Führungsrohr 9 ist der Kolben 7 eines nicht vollständig dargestellten Schlagwerkes 6 axial versetzbar angeordnet. Der Kolben 7 steht über einen Bolzen 8 mit einem Pleuel in Verbindung, das das zweite freien Ende des Führungsrohres 9 entgegen der Bearbeitungsrichtung überragt.In the interior of the drilling and / or chiseling device is shown in FIGS. 2 to 4 extending parallel to the machining
Zwischen dem Kolben 7 und dem ersten freien Ende des Führungsrohres 9 befindet sich ein mit einem Döpper 17 zusammenwirkender Schläger 19, der über ein vom Kolben 7 aufgebautes Luftpolster hin- und herversetzbar ist. Das Führungsrohr 9 weist mehrere radial verlaufende Luftdurchlässe 10 und mehrere radial verlaufende weitere Luftdurchlässe 11 auf, die zwischen dem Kolben 7 und dem Schläger 19 angeordnet sind und über die der Druck des Luftpolsters beeinflussbar ist. Die Luftdurchlässe 10 sind entlang des Umfangs einer ersten Ebene E1 und die Luftdurchlässe 11 sind entlang des Umfangs einer weiteren Ebene E2 verteilt, die entgegen der Bearbeitungsrichtung von der ersten Ebene E1 beabstandet ist.Between the
Die Steuerung der Luftdurchlässe 10 und der weiteren Luftdurchlässe 11 erfolgt mittels eines Steuerkörpers, der gegenüber dem Führungsrohr 9 von dem Döpper 17 entgegen der Bearbeitungsrichtung und von einer Feder 12 in Bearbeitungsrichtung versetzbar ist. Der Döpper 17 wird in einer Döpperführung 18 geführt, die axial mit dem Führungsrohr 9 in Verbindung steht. Die Feder 12 umgibt das Führungsrohr 9 auf der Aussenseite und stützt sich an einer Anschlagkante des Gehäuses 1 und einer entgegen der Bearbeitungsrichtung weisenden Stützfläche der Schalthülse 13 ab.The control of the
Der Steuerkörper wird gebildet von einer Schaltgabel 15, einer Schaltstange 14 und einer Schalthülse 13. Die Schaltgabel 15 wirkt im Innenraum des Führungsrohres 9 mit dem Döpper 17 zusammen und durchsetzt mit ihren einander gegenüberliegenden freien Enden einander diametral gegenüberliegende Öffnungen 16 des Führungsrohres 9. Die freien Enden der Schaltgabel 15 stehen in formschlüssiger Verbindung mit der als Drahtbügel ausgebildeten Schaltstange 14. Ein Teil der Schaltstange 14 ist halbkreisförmig geformt und ragt in eine umlaufend ausgebildete Vertiefung der Schalthülse 13. Die beiden freien Enden der Schaltstange 14 erstrecken sich in Bearbeitungsrichtung und umgreifen formschlüssig die beiden freien Enden der Schaltgabel 15.The control body is formed by a
Die Fig. 2 zeigt den Steuerkörper in seiner Grundstellung. Das Gerät befindet sich nicht in einer angepressten Stellung. Die im Abstand A voneinander angeordneten Luftdurchlässe 10 und die weiteren Luftdurchlässe 11 sind offen. Über alle Luftdurchlässe 10, 11 wird eine derart starke Belüftung des Innenraumes des Führungsrohres 9 erreicht, so dass der Kolben 7 kein Luftpolster aufbauen und den Schläger 19 in Bearbeitungsrichtung versetzen kann.Fig. 2 shows the control body in its normal position. The device is not in a pressed position. The at a distance A from each other arranged
Die Fig. 3 zeigt den Steuerkörper in einer ersten Anpressstellung, die beim Anpressen des Gerätes gegen den zu bearbeitenden, nicht dargestellten Untergrund beispielsweise nach dem halben Anpressweg erreicht wird. Die beim Anpressen stattfindende Versetzung des Döppers 17 entgegen der Bearbeitungsrichtung bewirkt ebenfalls eine Versetzung des Steuerkörpers in die gleiche Richtung. Die Schalthülse 13 des Steuerkörpers deckt alle Luftdurchlässe 10 ab. Nur die weiteren Luftdurchlässe 11 sind offen. Vom Kolben 7 kann ein Luftpolster mit einem geringen Druck aufgebaut werden. Der Druck dieses Luftpolsters reicht aus, um den Schläger 19 mit einer langsamen Geschwindigkeit in Bearbeitungsrichtung zu versetzen.Fig. 3 shows the control body in a first pressing position, which is achieved when pressed against the device to be machined, not shown, for example, after half the Anpressweg. The occurring during pressing displacement of the
Die Fig. 4 zeigt den Steuerkörper in einer weiteren Anpressstellung, die nach dem vollständigen Anpressen des Geräts gegen den zu bearbeitenden Untergrund erreicht wird. Die Schalthülse 13 des Steuerkörpers deckt alle Luftdurchlässe 10 und alle weiteren Luftdurchlässe 11 ab. Der Innenraum des Führungsrohres 9 ist nicht mehr belüftet. Vom Kolben 7 kann ein Luftpolster aufgebaut werden, mit dem der Schläger 19 mit einer hohen Geschwindigkeit in Bearbeitungsrichtung versetzbar ist.Fig. 4 shows the control body in a further pressing position, which is achieved after the complete pressing of the device against the substrate to be processed. The
Claims (5)
- Drilling and/or chiselling tool comprising a striking mechanism (6), the piston (7) of which reciprocates a striker (19) guided in a guide tube (9) and cooperating with a plunger (17) by means of an air cushion, the guide tube (9) being provided between the piston (7) and the striker (19) with a plurality of radially extending air passages (10) of identical cross section distributed around the circumference along a first plane (E1) extending perpendicularly to the machining direction, which air passages can be covered by a control body displaceable parallel to the machining direction and cooperating with the plunger (17), characterised in that the guide tube (9) is provided between the piston (7) and the striker (19) with further radially extending air passages (11) distributed around the circumference along at least one further plane (E2) arranged at a distance from the first plane (E1) in the opposite direction to the machining direction, the planes (E1, E2) extending essentially in parallel.
- Tool according to claim 1, characterised in that a plurality of further air passages (11) are distributed around the circumference along the further planes (E1, E2).
- Tool according to claim 2, characterised in that the further air passages (11) are distributed in a uniform manner around the respective circumference.
- Tool according to one of claims 1 to 3, characterised in that all of the further air passages (11) have the same cross section.
- Tool according to claim 4, characterised in that the cross section of each further air passage (11) corresponds essentially to the cross section of each air passage (10).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19714288 | 1997-04-07 | ||
| DE19714288A DE19714288A1 (en) | 1997-04-07 | 1997-04-07 | Drilling and / or chiseling device |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0876880A2 EP0876880A2 (en) | 1998-11-11 |
| EP0876880A3 EP0876880A3 (en) | 2002-11-27 |
| EP0876880B1 true EP0876880B1 (en) | 2006-11-15 |
Family
ID=7825677
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98810142A Expired - Lifetime EP0876880B1 (en) | 1997-04-07 | 1998-02-23 | Drill- and/or percussion apparatus |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5975217A (en) |
| EP (1) | EP0876880B1 (en) |
| JP (1) | JP4195119B2 (en) |
| CN (1) | CN1065165C (en) |
| DE (2) | DE19714288A1 (en) |
Families Citing this family (48)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6309829B1 (en) * | 1997-05-27 | 2001-10-30 | Pe Corporation (Ny) | Length determination of nucleic acid repeat sequences by discontinuous primer extension |
| GB9902793D0 (en) * | 1999-02-09 | 1999-03-31 | Black & Decker Inc | Rotary hammer |
| GB9902789D0 (en) * | 1999-02-09 | 1999-03-31 | Black & Decker Inc | Rotary hammer |
| DE19929183B4 (en) * | 1999-06-25 | 2004-07-29 | Wacker Construction Equipment Ag | Air spring hammer mechanism with hollow impact piston with idle opening |
| DE19955412A1 (en) * | 1999-11-18 | 2001-05-23 | Hilti Ag | Drilling and chiseling device |
| DE10019071A1 (en) * | 2000-04-18 | 2001-10-25 | Hilti Ag | Electric hand tool device with blank stop |
| DE10033362A1 (en) * | 2000-07-08 | 2002-01-17 | Hilti Ag | Electric hand tool with empty stroke shutdown |
| DE10111717C1 (en) * | 2001-03-12 | 2002-10-24 | Wacker Werke Kg | Air spring hammer mechanism with motion frequency controlled idle state |
| GB0109747D0 (en) | 2001-04-20 | 2001-06-13 | Black & Decker Inc | Hammer |
| DE10121088A1 (en) * | 2001-04-28 | 2002-11-07 | Bosch Gmbh Robert | Hammer drill and / or chisel hammer |
| DE10145464C2 (en) | 2001-09-14 | 2003-08-28 | Wacker Construction Equipment | Drill and / or impact hammer with idle control depending on the contact pressure |
| JP4016772B2 (en) * | 2001-11-16 | 2007-12-05 | 日立工機株式会社 | Hammer drill |
| DE10156388A1 (en) * | 2001-11-16 | 2003-06-05 | Bosch Gmbh Robert | Hand tool with a pneumatic striking mechanism |
| DE10333799B3 (en) * | 2003-07-24 | 2005-02-17 | Wacker Construction Equipment Ag | Hollow piston impact mechanism with air compensation and idling opening |
| JP4179159B2 (en) * | 2003-12-18 | 2008-11-12 | 日立工機株式会社 | Impact tool |
| DE502004011101D1 (en) * | 2004-06-18 | 2010-06-10 | Hilti Ag | Device for improving the turn-off behavior of an electropneumatic degradation device |
| US7306048B2 (en) * | 2004-11-24 | 2007-12-11 | Hitachi Koki Co., Ltd. | Hammer drill having switching mechanism for switching operation modes |
| DE102005028918A1 (en) * | 2005-06-22 | 2006-12-28 | Wacker Construction Equipment Ag | Drilling and/or percussive hammer for making holes has delay device controlling valve during closing |
| DE102005036560A1 (en) * | 2005-08-03 | 2007-02-08 | Wacker Construction Equipment Ag | Drilling and / or percussion hammer with linear drive and air cooling |
| JP4509890B2 (en) * | 2005-08-19 | 2010-07-21 | 株式会社マキタ | Impact type work tool |
| US7383895B2 (en) * | 2005-08-19 | 2008-06-10 | Makita Corporation | Impact power tool |
| JP5041575B2 (en) * | 2006-03-07 | 2012-10-03 | 日立工機株式会社 | Impact tool |
| DE102007000081A1 (en) * | 2007-02-08 | 2008-08-21 | Hilti Ag | Hand tool with pneumatic percussion |
| JP4965333B2 (en) * | 2007-05-14 | 2012-07-04 | 株式会社マキタ | Impact tool |
| US8485274B2 (en) * | 2007-05-14 | 2013-07-16 | Makita Corporation | Impact tool |
| JP4965334B2 (en) * | 2007-05-14 | 2012-07-04 | 株式会社マキタ | Impact tool |
| JP4889564B2 (en) * | 2007-05-14 | 2012-03-07 | 株式会社マキタ | Impact tool |
| US8534527B2 (en) * | 2008-04-03 | 2013-09-17 | Black & Decker Inc. | Cordless framing nailer |
| US9216502B2 (en) | 2008-04-03 | 2015-12-22 | Black & Decker Inc. | Multi-stranded return spring for fastening tool |
| DE102008064221B4 (en) * | 2008-12-22 | 2016-03-17 | Koki Technik Transmission Systems Gmbh | shift fork |
| US8636081B2 (en) | 2011-12-15 | 2014-01-28 | Milwaukee Electric Tool Corporation | Rotary hammer |
| JP5518617B2 (en) * | 2010-08-02 | 2014-06-11 | 株式会社マキタ | Impact tool |
| DE102010062874A1 (en) * | 2010-12-13 | 2012-06-14 | Hilti Aktiengesellschaft | Hand tool |
| US8393409B2 (en) * | 2010-12-29 | 2013-03-12 | Ortho Technologies, Llc | Electric motor driven tool for orthopedic impacting |
| JP6229956B2 (en) | 2010-12-29 | 2017-11-15 | メディカル エンタープライゼス， エルエルシー | Electric motor driven instrument for applying orthopedic impact |
| US8695726B2 (en) | 2010-12-29 | 2014-04-15 | Medical Enterprises LLC | Electric motor driven tool for orthopedic impacting |
| US9308636B2 (en) | 2012-02-03 | 2016-04-12 | Milwaukee Electric Tool Corporation | Rotary hammer with vibration dampening |
| DE102012209020A1 (en) * | 2012-05-29 | 2013-12-05 | Robert Bosch Gmbh | Hand-held power tool rammer installed in e.g. drilling hammer, has shock damping unit that damps racket, and enables multi-stage attenuation |
| US9346158B2 (en) | 2012-09-20 | 2016-05-24 | Black & Decker Inc. | Magnetic profile lifter |
| US9399281B2 (en) | 2012-09-20 | 2016-07-26 | Black & Decker Inc. | Stall release lever for fastening tool |
| EP2821183B1 (en) | 2013-07-05 | 2017-06-21 | Black & Decker Inc. | Hammer Drill |
| EP2857150A1 (en) * | 2013-10-03 | 2015-04-08 | HILTI Aktiengesellschaft | Manual tool machine |
| WO2015133198A1 (en) * | 2014-03-03 | 2015-09-11 | 日立工機株式会社 | Striking tool |
| EP3181300A1 (en) * | 2015-12-15 | 2017-06-21 | HILTI Aktiengesellschaft | Percussive handheld machine tool |
| CN106895131B (en) * | 2015-12-21 | 2024-01-23 | 博世电动工具（中国）有限公司 | Sealing ventilation device and equipment comprising same |
| WO2020056654A1 (en) * | 2018-09-20 | 2020-03-26 | 博世电动工具（中国）有限公司 | Impact machine tool |
| CN219337617U (en) * | 2020-04-02 | 2023-07-14 | 米沃奇电动工具公司 | Rotary hammer |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2580158A (en) * | 1948-12-23 | 1951-12-25 | Dean William Henry | Power-operated portable tool |
| US4113035A (en) * | 1977-04-21 | 1978-09-12 | Licentia Patent-Verwaltungs-G.M.B.H. | Hammer drill with drive and percussion elements accommodated in a cylinder |
| EP0052507B1 (en) * | 1980-11-18 | 1985-02-13 | Black & Decker Inc. | Percussive drills |
| DE3304916A1 (en) * | 1983-02-12 | 1984-08-16 | Robert Bosch Gmbh, 7000 Stuttgart | DRILLING HAMMER |
| DE3826213A1 (en) * | 1988-08-02 | 1990-02-15 | Bosch Gmbh Robert | DRILLING HAMMER |
| DE3932134A1 (en) * | 1989-09-27 | 1991-04-04 | Bosch Gmbh Robert | Motor driven hammer - has indirect air cushion striker action which can be adjusted from outside |
| DE4239294A1 (en) * | 1992-11-23 | 1994-05-26 | Black & Decker Inc | Hammer drill with pneumatic hammer mechanism |
| JP2602411Y2 (en) * | 1993-11-26 | 2000-01-17 | 日立工機株式会社 | Switching mechanism of impact tool |
| JP3292969B2 (en) * | 1995-08-18 | 2002-06-17 | 株式会社マキタ | Hammer drill |
| JP3292972B2 (en) * | 1996-03-29 | 2002-06-17 | 株式会社マキタ | Impact tool |
-
1997
- 1997-04-07 DE DE19714288A patent/DE19714288A1/en not_active Withdrawn
-
1998
- 1998-02-23 EP EP98810142A patent/EP0876880B1/en not_active Expired - Lifetime
- 1998-02-23 DE DE59813801T patent/DE59813801D1/en not_active Expired - Lifetime
- 1998-04-06 JP JP09352798A patent/JP4195119B2/en not_active Expired - Lifetime
- 1998-04-06 CN CN98106333A patent/CN1065165C/en not_active Expired - Fee Related
- 1998-04-07 US US09/056,588 patent/US5975217A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE19714288A1 (en) | 1998-10-08 |
| US5975217A (en) | 1999-11-02 |
| JPH10309679A (en) | 1998-11-24 |
| JP4195119B2 (en) | 2008-12-10 |
| CN1197716A (en) | 1998-11-04 |
| EP0876880A3 (en) | 2002-11-27 |
| DE59813801D1 (en) | 2006-12-28 |
| EP0876880A2 (en) | 1998-11-11 |
| CN1065165C (en) | 2001-05-02 |
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