EP0266305B1 - Drillhammer with percussion mechanism - Google Patents
Drillhammer with percussion mechanism Download PDFInfo
- Publication number
- EP0266305B1 EP0266305B1 EP87810528A EP87810528A EP0266305B1 EP 0266305 B1 EP0266305 B1 EP 0266305B1 EP 87810528 A EP87810528 A EP 87810528A EP 87810528 A EP87810528 A EP 87810528A EP 0266305 B1 EP0266305 B1 EP 0266305B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tool
- ring
- balls
- guide cylinder
- spring
- 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
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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
- B25D11/005—Arrangements for adjusting the stroke of the impulse member or for stopping the impact action when the tool is lifted from the working surface
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- 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
- B25D2211/068—Crank-actuated impulse-driving mechanisms
Definitions
- the invention relates to a hammer drill with percussion mechanism, in which a flying piston, which conveys a tool to a tool, is displaceably mounted in a guide cylinder between a position facing away from the tool and a position facing the tool, and beyond the reciprocating movement intended to act on the tool is further displaceable into an empty position and spring-loaded balls which can be inserted radially by the spring force into a recess in the tool-side end area on the flying piston in the tool-side end area of the guide cylinder for holding the flying piston in the empty position.
- Known rotary hammers have a striking mechanism which is used to impart strikes to a clamped tool for performing work.
- So-called pneumatic percussion mechanisms have proven to be particularly advantageous which have a flying piston which is caused to move back and forth in a guide cylinder by overpressure or underpressure from a drive piston and thereby acts on the tool with each stroke directed towards the tool.
- care is taken to ensure that the flying piston is brought to a standstill despite the drive piston continuing to run.
- the flying piston can be moved further towards the tool beyond the working stroke movement provided for the application of the tool. If the flying piston carries out this further displacement movement, a circumferential recess of the flying piston comes into the effective range of balls which spring radially into the trajectory of the flying piston. The latter snap into the recess of the flying piston and hold it in the so-called empty position. To reactivate the flying piston, it is pushed out of the empty position directly or indirectly by the tool.
- a spring-elastic 0-ring acts radially on these to deflect them.
- Balls and O-ring are held in a guide ring adjacent to the guide cylinder.
- Significant disadvantages arise in particular from the high abrupt stress on the O-ring when the flying piston enters the effective area of the balls, which are disengaged at high speed. This leads to premature wear of the O-ring.
- this arrangement of balls and O-ring does not allow a radially compact design, since both the balls and the O-ring lying above them are sunk in the guide ring and a radial spring travel must also be taken into account.
- An O-ring also has a strongly progressive spring characteristic and a large spread of spring force.
- an automatic spring punch is known. It is a hand tool that has no special requirements with regard to wear.
- the tool has a piston for generating a single stroke as a one-time action.
- the energy required to pressurize the tool is achieved by pretensioning the hardest spring when pressing the tool onto the component.
- the piston has a circumferential groove in the central area, in which locking elements engage in the form of two balls. The balls are held radially displaceably in a guide sleeve in a radial through bore. In the relaxed state of the tool, the piston is connected to the guide sleeve via the balls.
- the spring required for the energy build-up of the piston and a spring which presses on a collar of the guide sleeve which extends radially outward are pretensioned.
- the invention is based on the object of ensuring a high life expectancy of the spring means in a hammer drill with a flying piston which is held by balls in the empty position with balls being held uniformly, and at the same time enabling a simple and compact construction.
- the object is achieved in that the balls are displaceably mounted in openings in the guide cylinder and are supported by a ring which can be displaced along the guide cylinder, wherein the ring is supported on the guide cylinder via a stop shoulder facing away from the tool by means of a compression spring driving the ring in the direction of the tool, and the contour of the ring serving to support the balls is designed as a conical surface.
- the spring-loaded ring presses against each of the balls with the same spring force and thus snaps them evenly into the recess of the flying piston, which may be in the empty position.
- the flying piston can be pushed out of the empty position while overcoming the spring force, the curvature of the balls, in cooperation with the conical surface of the ring lying against them, allowing the ring to be displaced against the spring force.
- the balls can thus withdraw from the trajectory of the flying piston.
- the conical surface allows an optimal transfer of the axial spring force to the balls, in that higher radial forces act on the balls for locking purposes with a relatively small axial force while deflecting the force.
- the conical surface also prevents any angular attack of the ring on the balls, which has both functional and wear-related advantages.
- the ring can for example consist of largely wear-resistant metal.
- the spring is not subjected to any direct radial action by the balls and therefore guarantees a long life expectancy, especially since steel is the preferred material for the spring.
- the conical surface expediently widens in the direction facing the tool. This arrangement is particularly advantageous if a short overall length of the device is to be achieved.
- the drill hammer shown in FIG. 1 with its front area has a guide cylinder 1 and a guide sleeve 2 screwed to it.
- the guide cylinder 1 is rotatably mounted in a device housing 4 via a roller bearing 3.
- the bore of the guide cylinder 1 is enlarged in diameter compared to the front area and accommodates a flying piston 5 and a drive piston 6 of a pneumatic percussion mechanism which is known per se and which is driven by a motor.
- a striker 7 extending into the guide sleeve 2 is slidably mounted. Blows transmitted from the flying piston 5 to the anvil 7 emits them to a tool 8 which is displaceably mounted in the guide sleeve 2.
- the flying piston 5 has a sealing ring 9 on the rear and is provided with a circumferential recess 11 on the front.
- the balls 13 are indented by a ring 14, the inner contour of which has a conical surface 15 for supporting the balls 13.
- a compression spring 16 which is shouldered on a support disk 17 of the guide cylinder 1, drives the ring 14 forward.
- the balls 13, together with the ring 14 and the compression spring 16, thus form a catching device for the flying piston 5.
- the flying piston 5 does not cover a ventilation opening 18 in the guide cylinder 1, so that further stroke movement of the drive piston 6 does not cause any Flight piston 5 causes pneumatic underpressure or overpressure in the guide cylinder 1 to set in motion.
- a sealing ring 19 engages around the striker 7 in the central longitudinal section for the sealing mounting of the striker.
- These balls 22 are mounted in bores 23 of the guide cylinder 1 and are held in engagement with the striker 7 by a retaining ring 24.
- the guide cylinder 1 is penetrated by two diametrically opposite opening 25, in which roller-shaped locking bodies 26 are axially and radially displaceable.
- the locking bodies 26 serve to hold the tool 8 in a rotationally locking and axially displaceable manner and for this purpose are radially indented in driving recesses 27 of the tool.
- An engagement element in the form of an adjusting sleeve 28 serves to engage the locking bodies 26. It is slidably seated concentrically on the guide sleeve 2 and is urged forward by a compression spring 29. 1 shows the tool 8 inserted into the guide sleeve 2 in the locking position and the adjusting sleeve 28 in the release position, into which it is withdrawn against the force of the compression spring 29. In the release position of the adjusting sleeve 28, the locking bodies 26 face pocket-shaped recesses 31 in the adjusting sleeve 28, so that the locking bodies 26 can be moved radially freely for inserting or removing the tool 8.
- the adjusting sleeve 28 is pushed forward by the compression spring 29 from the release position shown in FIG. 1 into the locking position shown in FIG. 2, the adjusting sleeve 28 running against a stop ring 32 of the guide sleeve 2.
- the inner contour 33 of the adjusting sleeve 28 lying behind the recesses 31 presses the locking bodies 26 into the driving recesses 27 on the tool side.
- the tool 8 In the locked position, the tool 8 is pressed against a work piece to perform the work, as a result of which the tool 8 moves the striker 7 backwards against the flying piston 5.
- the flying piston 5 moves out of the holding engagement of the balls 13 by disengaging the balls 13 against the force of the compression spring 16 into the impact-effective working position which can be seen in FIG. 2.
- the flying piston 5 covers the ventilation opening 18, as a result of which alternating negative and positive pressure is created in the guide cylinder 1 between the flying piston 5 and the driving piston 6, which leads to the lifting movement of the flying piston 5.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Percussive Tools And Related Accessories (AREA)
- Drilling And Boring (AREA)
Description
Die Erfindung betrifft einen Bohrhammer mit Schlagwerk, wobei in einem Führungszylinder ein einem Werkzeug Schläge vermittelnder Flugkolben zwischen einer dem Werkzeug abgewandten und einer dem Werkzeug zugewandten Stellung hin und her verschiebbar gelagert, sowie über die zur Beaufschlagung des Werkzeuges vorgesehene Hin- und Herbewegung hinaus zum Werkzeug hin in eine Leerschlagstellung weiter verschiebbar ist und federbelasteten, durch die Federkraft radial in eine im werkzeugseitigen Endbereich angeordnete Ausnehmung am Flugkolben einrückbaren Kugeln im werkzeugseitigen Endbereich des Führungszylinders zum Festhalten des Flugkolbens in der Leerschlagstellung.The invention relates to a hammer drill with percussion mechanism, in which a flying piston, which conveys a tool to a tool, is displaceably mounted in a guide cylinder between a position facing away from the tool and a position facing the tool, and beyond the reciprocating movement intended to act on the tool is further displaceable into an empty position and spring-loaded balls which can be inserted radially by the spring force into a recess in the tool-side end area on the flying piston in the tool-side end area of the guide cylinder for holding the flying piston in the empty position.
Bekannte Bohrhämmer verfügen über ein Schlagwerk, das dazu dient, einem eingespannten Werkzeug zur Arbeitsverrichtung Schläge zu vermitteln. Als besonders vorteilhaft haben sich sogenannte pneumatische Schlagwerke erwiesen, die einen Flugkolben aufweisen, der in einem führungszylinder durch Ueber- bzw Unterdruck von einem Antriebskolben in hin und her gehende Bewegung versetzt wird und dabei mit jedem zum Werkzeug hin gerichteten Hub das Werkzeug beaufschlagt. Insbesondere aus Gründen der Geräteschonung bei leerschlagendem Werkzeug wird bei Abschaltbarkeit der Beaufschlagung des Werkzeugs dafür gesorgt, dass der Flugkolben trotz weiterlaufendem Antriebskolben stillgesetzt wird.Known rotary hammers have a striking mechanism which is used to impart strikes to a clamped tool for performing work. So-called pneumatic percussion mechanisms have proven to be particularly advantageous which have a flying piston which is caused to move back and forth in a guide cylinder by overpressure or underpressure from a drive piston and thereby acts on the tool with each stroke directed towards the tool. In particular for reasons of protecting the device when the tool is empty, when the tool can be switched off, care is taken to ensure that the flying piston is brought to a standstill despite the drive piston continuing to run.
Zum Zwecke des Stillsetzens des Flugkolbens ist bei einem der DE-PS 2 806 611 entnehmbaren Bohrhammer der Flugkolben über die zur Beaufschlagung des Werkzeugs vorgesehene Arbeitshub-Bewegung hinaus zum Werkzeug hin weiter verschiebbar. Führt der Flugkolben diese weitere Verschiebebewegung aus, so gelangt eine umlaufende Ausnehmung des Flugkolbens in den Wirkbereich von radial in die Bewegungsbahn des Flugkolbens einfedernden Kugeln. Letztere rasten in die Ausnehmung des Flugkolbens ein und halten diesen in der sogenannten Leerschlagstellung fest. Zum neuerlichen Aktivieren des Flugkolbens wird dieser direkt oder indirekt vom Werkzeug wieder aus der Leerschlagstellung gestossen.For the purpose of stopping the flying piston, in one of DE-PS 2 806 611 removable hammer drills the flying piston can be moved further towards the tool beyond the working stroke movement provided for the application of the tool. If the flying piston carries out this further displacement movement, a circumferential recess of the flying piston comes into the effective range of balls which spring radially into the trajectory of the flying piston. The latter snap into the recess of the flying piston and hold it in the so-called empty position. To reactivate the flying piston, it is pushed out of the empty position directly or indirectly by the tool.
Zum Einfedern der Kugeln wirkt auf diese radial ein federelastischer 0-Ring ein. Kugeln und O-Ring sind in einem dem Führungszylinder benachbarten Führungsring gehaltert. Erhebliche Nachteile ergeben sich dabei insbesondere durch die hohe schlagartige Beanspruchung des O-Ringes beim Eintreten des Flugkolbens in den Wirkbereich der Kugeln, die dabei mit hoher Geschwindigkeit ausgerückt werden. Dies führt zu frühzeitigem Verschleiss des O-Ringes. Hinzu kommt der weitere Nachteil, dass diese Anordnung von Kugeln und O-Ring eine radial gedrängte Bauweise nicht erlaubt, da im Führungsring sowohl die Kugeln als auch der darüber liegende O-Ring versenkt gelagert sind und zusätzlich ein radialer Federweg zu berücksichtigen ist. Ein O-Ring weist zudem eine stark progressive Federkennlinie sowie grosse Streuung der Federkraft auf.A spring-elastic 0-ring acts radially on these to deflect them. Balls and O-ring are held in a guide ring adjacent to the guide cylinder. Significant disadvantages arise in particular from the high abrupt stress on the O-ring when the flying piston enters the effective area of the balls, which are disengaged at high speed. This leads to premature wear of the O-ring. In addition, there is the further disadvantage that this arrangement of balls and O-ring does not allow a radially compact design, since both the balls and the O-ring lying above them are sunk in the guide ring and a radial spring travel must also be taken into account. An O-ring also has a strongly progressive spring characteristic and a large spread of spring force.
Aus der FR-PS 987 499 ist ein automatischer Federschlagkörner bekannt. Es handelt sich dabei um ein Handwerkzeug, an welches hinsichtlich Verschleiss keine besonderen Anforderungen gestellt werden. Zur Erzeugung eines einzelnen Schlages als Einmalaktion weist das Werkzeug einen Kolben auf.From the FR-PS 987 499 an automatic spring punch is known. It is a hand tool that has no special requirements with regard to wear. The tool has a piston for generating a single stroke as a one-time action.
Im Inneren des Werkzeuges befinden sich drei Druckfedern mit unterschiedlichen Federkennlinien. Die zur Beaufschlagung des Werkzeuges notwendige Energie wird durch das Vorspannen der härtesten Feder beim Andrücken des Werkzeuges auf das Bauteil erreicht. Der Kolben weist im mittleren Bereich eine umlaufende Nut auf, in der Verriegelungselemente in Form zweier Kugeln eingreifen. Die Kugeln werden in einer radialen Durchgangsbohrung in einer Führungshülse radial verschiebbar gehalten. Im entspannten Zustand des Werkzeuges ist der Kolben mit der Führungshülse über die Kugeln verbunden. Beim Andrücken des Werkzeuges auf das Bauteil wird die für den Energieaufbau des Kolbens notwendige Feder und eine auf einen radial nach aussen erstreckenden Kragen der Führungshülse drückende Feder vorgespannt.Inside the tool there are three compression springs with different spring characteristics. The energy required to pressurize the tool is achieved by pretensioning the hardest spring when pressing the tool onto the component. The piston has a circumferential groove in the central area, in which locking elements engage in the form of two balls. The balls are held radially displaceably in a guide sleeve in a radial through bore. In the relaxed state of the tool, the piston is connected to the guide sleeve via the balls. When the tool is pressed onto the component, the spring required for the energy build-up of the piston and a spring which presses on a collar of the guide sleeve which extends radially outward are pretensioned.
Der Erfindung liegt die Aufgabe zugrunde, bei einem Bohrhammer mit in Leerschlagstellung durch Kugeln festhaltbarem Flugkolben bei gleichmässiger Federbelastung der Kugeln eine hohe Lebenserwartung der Federmittel zu gewährleisten und gleichzeitig eine einfache und gedrängte Bauweise zu ermöglichen.The invention is based on the object of ensuring a high life expectancy of the spring means in a hammer drill with a flying piston which is held by balls in the empty position with balls being held uniformly, and at the same time enabling a simple and compact construction.
Erfindungsgemäss wird die Aufgabe dadurch gelöst, dass die Kugeln in Durchbrüchen im Führungszylinder verschiebbar gelagert und von einem entlang des Führungszylinders verschiebbaren Ring abgestützt sind, wobei sich der Ring über eine vom Werkzeug abgewandte Anschlagschulter mittels einer den Ring in Richtung Werkzeug treibenden Druckfeder am Führungszylinder abstützt und die dem Abstützen der Kugeln dienende Kontur des Ringes als Kegelfläche ausgebildet ist.According to the invention, the object is achieved in that the balls are displaceably mounted in openings in the guide cylinder and are supported by a ring which can be displaced along the guide cylinder, wherein the ring is supported on the guide cylinder via a stop shoulder facing away from the tool by means of a compression spring driving the ring in the direction of the tool, and the contour of the ring serving to support the balls is designed as a conical surface.
Der federbelastete Ring drückt mit gleicher Federkraft gegen jede der Kugeln und rastet diese so gleichmässig in die Ausnehmung des sich gegebenenfalls in Leerschlagstellung befindlichen Flugkolbens ein. Der Flugkolben kann unter Ueberwindung der Federkraft aus der Leerschlagstellung gestossen werden, wobei die Krümmung der Kugeln unter Zusammenwirken mit der an diesen anliegenden Kegelfläche des Ringes ein Verschieben des Ringes gegen die Federkraft ermöglicht. Die Kugeln können so aus der Bewegungsbahn des Flugkolbens zurücktreten.The spring-loaded ring presses against each of the balls with the same spring force and thus snaps them evenly into the recess of the flying piston, which may be in the empty position. The flying piston can be pushed out of the empty position while overcoming the spring force, the curvature of the balls, in cooperation with the conical surface of the ring lying against them, allowing the ring to be displaced against the spring force. The balls can thus withdraw from the trajectory of the flying piston.
Die Kegelfläche erlaubt ein optimales Übertragen der axialen Federkraft auf die Kugeln, indem mit relativ kleiner axialer Kraft unter Umlenkung der Kraft höhere radiale Kräfte zum Rastzwecke auf die Kugeln einwirken. Die Kegelfläche verhindert auch jeglichen kantigen Angriff des Ringes an den Kugeln, was sowohl funktionelle als auch verschleisstechnische Vorteile mit sich bringt.The conical surface allows an optimal transfer of the axial spring force to the balls, in that higher radial forces act on the balls for locking purposes with a relatively small axial force while deflecting the force. The conical surface also prevents any angular attack of the ring on the balls, which has both functional and wear-related advantages.
Der Ring kann beispielsweise aus weitestgehend verschleissfestem Metall bestehen. Die Feder unterliegt keiner direkten radialen Beaufschlagung durch die Kugeln und gewährleistet demnach hohe Lebenserwartung, zumal als Material für die Feder Stahl bevorzugt in Betracht kommt. Eine gedrängte radiale Bauweise und das zur Vereinfachung führende Anordnen der Kugeln in Durchbrüchen des Führungszylinders ist so möglich, da die Federkraft axial auf den Ring und von diesem unter Umlenkung radial auf die Kugeln einwirkt.The ring can for example consist of largely wear-resistant metal. The spring is not subjected to any direct radial action by the balls and therefore guarantees a long life expectancy, especially since steel is the preferred material for the spring. A compact radial design and the arrangement of the balls in openings in the guide cylinder, which leads to simplification, is possible because the spring force acts axially on the ring and radially deflects it on the balls.
Zweckmässig erweitert sich die Kegelfläche in der dem Werkzeug zugewandten Richtung. Diese Anordnung ist insbesondere von Vorteil, wenn eine kurze Baulänge des Gerätes erreicht werden soll.The conical surface expediently widens in the direction facing the tool. This arrangement is particularly advantageous if a short overall length of the device is to be achieved.
Die Erfindung wird nachstehend anhand von Zeichnungen, die ein Ausführungsbeispiel wiedergeben, näher erläutert.
Es zeigen:
- Fig. 1
- einen Längsschnitt durch den Vorderbereich eines Bohrhammers in Leerschlagstellung mit eingeführtem Werkzeug, vor dem Verriegeln;
- Fig. 2
- einen Längsschnitt durch den Vorderbereich des Bohrhammers nach Fig. 1 in Arbeitsstellung.
Show it:
- Fig. 1
- a longitudinal section through the front region of a rotary hammer in the empty position with inserted tool, before locking;
- Fig. 2
- a longitudinal section through the front region of the rotary hammer according to FIG. 1 in the working position.
Der in Fig. 1 mit seinem Vorderbereich dargestellte Bohrhammer verfügt über einen Führungszylinder 1 und eine mit diesem verschraubte Führungshülse 2. Der Führungszylinder 1 ist über ein Wälzlager 3 in einem Gerätegehäuse 4 drehgelagert. Im hinteren Bereich ist die Bohrung des Führungszylinders 1 gegenüber dem vorderen Bereich im Durchmesser erweitert und nimmt einen Flugkolben 5 und einen motorisch in Hubbewegung versetzten Antriebskolben 6 eines an sich bekannten pneumatischen Schlagwerkes auf. In dem nach vorne anschliessenden Bereich der Bohrung mit kleinerem Durchmesser ist ein in die Führungshülse 2 sich erstreckender Döpper 7 verschiebbar gelagert. Vom Flugkolben 5 an den Döpper 7 übertragene Schläge gibt dieser an ein in der Führungshülse 2 verschiebbar gelagertes Werkzeug 8 ab.The drill hammer shown in FIG. 1 with its front area has a
Der Flugkolben 5 verfügt hinterseitig über einen Dichtring 9 und ist vorderseitig mit einer umlaufenden Ausnehmung 11 versehen. Wie die Fig. 1 zeigt, rasten in Durchbrüchen 12 des Führungszylinders 1 gelagerte Kugeln 13 in die Ausnehmung 11 ein, um den Flugkolben 5 in der gezeigten Leerschlagstellung zu halten. Die Kugeln 13 werden von einem Ring 14, dessen Innenkontur eine Kegelfläche 15 zum Abstützen der Kugeln 13 aufweist, eingerückt. Hierzu treibt eine Druckfeder 16, die sich an einer Stützscheibe 17 des Führungszylinders 1 abschultert, den Ring 14 nach vorne. Die Kugeln 13 bilden so zusammen mit dem Ring 14 und der Druckfeder 16 eine Fangvorrichtung für den Flugkolben 5. In der Leerschlagstellung deckt der Flugkolben 5 eine Entlüftungsöffnung 18 im Führungszylinder 1 nicht ab, so dass weitere Hubbewegung des Antriebskolbens 6 keinen den Flugkolben 5 in Bewegung versetzenden pneumatischen Unter-oder Ueberdruck im Führungszylinder 1 verursacht. Zur dichtenden Lagerung des Döppers 7 umgreift diesen im mittleren Längsabschnitt ein Dichtring 19. Der verschieblichen Halterung des Döppers 7 dienen Längsnuten 21, in welche Kugeln 22 einragen. Diese Kugeln 22 sind in Bohrungen 23 des Führungszylinders 1 gelagert und werden von einem Haltering 24 in Eingriff mit dem Döpper 7 gehalten.The flying piston 5 has a
Vorderseitig ist der Führungszylinder 1 von zwei einander diametral gegenüberliegenden Oeffnung 25 durchsetzt, in welchen walzenförmige Verriegelungskörper 26 axial und radial versetzbar gelagert sind. Die Verriegelungskörper 26 dienen der drehschlüssigen und axial verschieblichen Halterung des Werkzeugs 8 und werden hierzu in Mitnahmevertiefungen 27 des Werkzeugs radial eingerückt.At the front, the
Dem Einrücken der Verriegelungskörper 26 dient ein Zustellorgan in Form einer Stellhülse 28. Diese sitzt verschiebbar konzentrisch auf der Führungshülse 2 und wird von einer Druckfeder 29 nach vorne beaufschlagt. Die Fig. 1 zeigt das in Verriegelungsstellung in die Führungshülse 2 eingeschobene Werkzeug 8 und die Stellhülse 28 in Freigabestellung, in welche sie gegen die Kraft der Druckfeder 29 zurückgezogen wird. In Freigabestellung der Stellhülse 28 stehen den Verriegelungskörpern 26 taschenförmige Ausnehmungen 31 in der Stellhülse 28 gegenüber, so dass die Verriegelungskörper 26 zum Einführen oder Entnehmen des Werkzeugs 8 radial frei beweglich sind.An engagement element in the form of an adjusting
Zum Verriegeln des Werkzeugs 8 wird die Stellhülse 28 von der Druckfeder 29 aus der in Fig. 1 gezeigten Freigabestellung in die der Fig. 2 entnehmbare Verriegelungsstellung nach vorne verschoben, wobei die Stellhülse 28 an einem Anschlagring 32 der Führungshülse 2 aufläuft. Die hinter den Ausnehmungen 31 liegende Innenkontur 33 der Stellhülse 28 drückt die Verriegelungskörper 26 in die werkzeugseitigen Mitnahmevertiefungen 27 ein.To lock the tool 8, the adjusting
In der Verriegelungsstellung wird das Werkzeug 8 zur Arbeitsverrichtung gegen ein Bearbeitungsgut gedrückt, wodurch das Werkzeug 8 den Döpper 7 nach hinten gegen den Flugkolben 5 verschiebt. Der Flugkolben 5 gelangt durch unter Ausrücken der Kugeln 13 gegen die Kraft der Druckfeder 16 aus dem Halteeingriff der Kugeln 13 in die der Fig. 2 entnehmbare schlagwirksame Arbeitsstellung. In der Arbeitsstellung überdeckt der Flugkolben 5 die Entlüftungsöffnung 18, wodurch im Führungszylinder 1 zwischen Flugkolben 5 und Antriebskolben 6 wechselweise Unter- und Ueberdruck entsteht, was zur Hubbewegung des Flugkolbens 5 führt.In the locked position, the tool 8 is pressed against a work piece to perform the work, as a result of which the tool 8 moves the
Claims (3)
- A hammer drill with percussion mechanism, wherein in a guide cylinder (1) a free piston (5), which transmits impacts to a tool (8), is mounted so as to be slidable to and fro between a position in which it turns away from the tool (8) and a position in which it turns towards the tool (8), as well as, upon the to and fro movement provided to impact the tool, being further slidable out towards the tool into a no load stroke position, and spring-loaded balls which are held radially by spring force in a recess (11) arranged in the end region of the free piston (5) near the tool to keep the free piston (5) in the no load stroke position in the end of the guide cylinder (1) near the tool, characterised in that the balls (13) are slidably mounted in openings (12) of the guide cylinder (1) and are supported by a ring (14) which is slidable along the guide cylinder (1), in which respect the ring (14) is supported on the guide cylinder (1) relative to a strike shoulder spaced further away from the tool (8) by means of a compression spring (16) which urges the ring (14) in the direction of the tool (8), and the contour of the ring (14) providing support to the balls (13) is formed as a bevelled surface (15).
- A hammer drill according to claim 1, characterised in that the bevelled surface (15) widens in the direction of the tool (8).
- A hammer drill according to claim 2, characterised in that a compression spring (16) acting on the ring, urging it in the direction of the tool (8) provides the spring force for engagement of the ball bearings (13).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3633675 | 1986-10-03 | ||
| DE19863633675 DE3633675A1 (en) | 1986-10-03 | 1986-10-03 | DRILLING HAMMER WITH STRIKE |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0266305A1 EP0266305A1 (en) | 1988-05-04 |
| EP0266305B1 true EP0266305B1 (en) | 1991-10-23 |
Family
ID=6310964
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP87810528A Expired - Lifetime EP0266305B1 (en) | 1986-10-03 | 1987-09-15 | Drillhammer with percussion mechanism |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US4798249A (en) |
| EP (1) | EP0266305B1 (en) |
| JP (1) | JPS6393578A (en) |
| DE (2) | DE3633675A1 (en) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5447205A (en) * | 1993-12-27 | 1995-09-05 | Ryobi Motor Products | Drill adjustment mechanism for a hammer drill |
| DE102005046664B4 (en) | 2005-09-29 | 2016-11-17 | Robert Bosch Gmbh | Method for creating a flexible display area for a video surveillance system |
| DE102006000395A1 (en) * | 2006-08-07 | 2008-02-14 | Hilti Ag | Hand tool with pneumatic percussion |
| DE102007000081A1 (en) * | 2007-02-08 | 2008-08-21 | Hilti Ag | Hand tool with pneumatic percussion |
| DE102008000727A1 (en) * | 2008-03-18 | 2009-09-24 | Robert Bosch Gmbh | Portable machine tool, in particular drilling or percussion hammer, with a club catching device and / or racket damping device |
| US9592600B2 (en) | 2011-02-23 | 2017-03-14 | Ingersoll-Rand Company | Angle impact tools |
| US8925646B2 (en) | 2011-02-23 | 2015-01-06 | Ingersoll-Rand Company | Right angle impact tool |
| 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 |
| US9022888B2 (en) | 2013-03-12 | 2015-05-05 | Ingersoll-Rand Company | Angle impact tool |
| EP3181300A1 (en) * | 2015-12-15 | 2017-06-21 | HILTI Aktiengesellschaft | Percussive handheld machine tool |
| EP3789162A1 (en) * | 2019-09-04 | 2021-03-10 | Hilti Aktiengesellschaft | Rotary drive for a handheld machine tool |
| EP3822030A1 (en) * | 2019-11-15 | 2021-05-19 | Hilti Aktiengesellschaft | Drill and/or chisel hammer with impact device assembly |
| EP3822037A1 (en) * | 2019-11-15 | 2021-05-19 | Hilti Aktiengesellschaft | Impact device assembly |
| EP4126464A4 (en) | 2020-03-23 | 2024-04-10 | Milwaukee Electric Tool Corp | Rotary hammer |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2290256A (en) * | 1940-11-04 | 1942-07-21 | Eugene H Souter | Pneumatic tool |
| FR987499A (en) * | 1943-02-26 | 1951-08-14 | Auto batting tool | |
| DE2165066B2 (en) * | 1971-12-28 | 1976-12-02 | Impex-Essen Vertrieb Von Werkzeugen Gmbh, 8800 Ansbach | ROTARY IMPACT DRILL |
| DE2242944B2 (en) * | 1972-08-31 | 1981-04-23 | Robert Bosch Gmbh, 7000 Stuttgart | Hammer drill |
| DE2252951B2 (en) * | 1972-10-28 | 1981-09-10 | Robert Bosch Gmbh, 7000 Stuttgart | Hammer drill |
| DE2806611C2 (en) * | 1978-02-16 | 1983-10-27 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Device for switching an electropneumatic hammer drill from rotary drilling to percussion drilling |
| DE2820128A1 (en) * | 1978-05-09 | 1979-11-22 | Bosch Gmbh Robert | CRAFT MACHINE |
| DE8027989U1 (en) * | 1980-10-21 | 1982-04-01 | Robert Bosch Gmbh, 7000 Stuttgart | DRILLING HAMMER |
| US4442906A (en) * | 1980-11-18 | 1984-04-17 | Black & Decker Inc. | Percussive drills |
-
1986
- 1986-10-03 DE DE19863633675 patent/DE3633675A1/en not_active Withdrawn
-
1987
- 1987-09-15 EP EP87810528A patent/EP0266305B1/en not_active Expired - Lifetime
- 1987-09-15 DE DE8787810528T patent/DE3774072D1/en not_active Expired - Fee Related
- 1987-10-01 JP JP62245932A patent/JPS6393578A/en active Pending
- 1987-10-05 US US07/105,084 patent/US4798249A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6393578A (en) | 1988-04-23 |
| EP0266305A1 (en) | 1988-05-04 |
| DE3774072D1 (en) | 1991-11-28 |
| US4798249A (en) | 1989-01-17 |
| DE3633675A1 (en) | 1988-04-14 |
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