EP0552328B1 - Percussion drill - Google Patents
Percussion drill Download PDFInfo
- Publication number
- EP0552328B1 EP0552328B1 EP92914235A EP92914235A EP0552328B1 EP 0552328 B1 EP0552328 B1 EP 0552328B1 EP 92914235 A EP92914235 A EP 92914235A EP 92914235 A EP92914235 A EP 92914235A EP 0552328 B1 EP0552328 B1 EP 0552328B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- guide tube
- hammer
- ring
- hammer drill
- tool socket
- 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
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- 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
- B25D17/08—Means for retaining and guiding the tool bit, e.g. chucks allowing axial oscillation of the tool bit
- B25D17/084—Rotating chucks or sockets
- B25D17/088—Rotating chucks or sockets with radial movable locking elements co-operating with bit shafts specially adapted therefor
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- 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
- B25D11/062—Means for driving the impulse member comprising a wobbling mechanism, swash plate
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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
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- 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
- B25D2217/003—Details relating to chucks with radially movable locking elements
- B25D2217/0038—Locking members of special shape
-
- 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
- B25D2217/003—Details relating to chucks with radially movable locking elements
- B25D2217/0038—Locking members of special shape
- B25D2217/0042—Ball-shaped locking members
-
- 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
- B25D2217/003—Details relating to chucks with radially movable locking elements
- B25D2217/0053—Devices for securing the tool retainer to the machine part
-
- 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
- B25D2250/191—Ram catchers for stopping the ram when entering idling mode
Definitions
- the invention is based on a hammer according to the preamble of claim 1.
- a rotary hammer is known in which, contrary to the otherwise customary design, the guide tube for the striking mechanism and the tool holder are in two parts. The two parts are connected by locking elements which engage as balls in recesses in both parts, which results in a high point load on the parts. For this reason, the guide tube, like the tool holder, had to be tempered or hardened. Otherwise, the construction requires a high level of construction.
- the hammer or rotary hammer according to the invention with the characterizing features of claim 1 has the advantage that the high axial forces resulting from the striking mechanism are transmitted over a large area. This enables the use of an unhardened guide tube, which prevents warping and reworking of the guide tube. Last but not least, the lower weight of the components to be hardened is accompanied by a noticeable relief for the environment due to the omission of hardening steps.
- the use of a resilient profile ring and corresponding, preferably adapted in shape grooves in the guide tube and in the tool holder avoid shear stresses of the connecting element, so that the profile ring is only subjected to pressure and no punctual, but only two-dimensional pressures on the components to be connected between " hard "and” soft “components occur.
- the grooves adapt exactly to the shape of the profile rings, so that they support with their entire surface.
- the axial connection according to the invention has the further advantage that the hammer sleeve is easy to manufacture in a plug-in assembly and that the tool holder runs smoothly.
- the contact surface In its inclined position with respect to the longitudinal axis, can be flat or also concave in order to adapt to the outer contour of the profile ring used.
- the profile ring can in particular have a circular or oval, rectangular or other cross section.
- a detent ring as a coupling part for a safety clutch, which is fastened by means of a plurality of rollers, which preferably lie linearly in three recesses. This makes the catch ring easily replaceable when worn. A good transfer of the torque between the catch ring and the guide sleeve is possible via the rollers with easy manufacturing possibilities.
- a round ring can advantageously also be attached in the guide tube, which is on a slope of the detent ring may be under tension. The entire construction makes it possible to use a seamlessly drawn or welded soft piece of pipe as a guide tube, which considerably reduces the manufacturing costs.
- the construction according to the invention has the further advantage that the connecting means between the guide tube and tool holder as well as the detent ring are very space-saving and enable a thin-walled hammer sleeve in comparison to one-piece designs.
- the connections therefore do not require any additional space, in contrast to the solution according to DE 38 28 309 C2.
- Figure 1 shows a longitudinal section through the front part of a hammer drill
- Figure 2 shows an enlarged view of an axial connection
- Figure 3 shows a perspective view of a hammer sleeve
- Figure 4 shows a second embodiment.
- a hammer drill has a housing 2 made of plastic, in which a motor, not shown, is housed, which drives an intermediate shaft 3.
- a striking mechanism 4 is accommodated in the housing 2, at the front end of which a tool holder 5 is arranged.
- the striking mechanism 4 lies within a three-part hammer sleeve 6, which consists of a guide tube 7, a tool holder 8 with a longitudinal axis 14 and a catch ring 9.
- the striking mechanism 4 is guided in the guide tube 7 which is mounted in the housing 2 and which is designed as a seamlessly drawn or welded uncured tube piece.
- the tool holder 8 can rest against the guide tube 7 inside (as in FIG. 1) or outside.
- the detent ring 9 which serves as part of a safety lock-up clutch 10.
- the safety clutch 10 has rollers 11 as driving bodies, which cooperate with locking recesses in the hardened locking ring 9 and with a gear wheel 12.
- the gear wheel 12 is rotatable relative to the guide tube 7 and engages in a toothing 13 of the intermediate shaft 3.
- the two parts 9 and 12 of the safety clutch 10 are pressed together by a compression spring 15, which determines the latching torque of the clutch.
- the compression spring 15 is secured in a known manner by means of a support disk 18 held in the guide tube 7 by round rings 16, 17.
- the striking mechanism 4 with a cup-shaped, reciprocatingly driven piston 20 and a striker 21 located therein.
- the energy of the striker 21 driven by the piston 20 is applied to a striker 22 and from there to a striker (not shown) Transfer tool.
- the piston 20 is guided in the guide tube 7.
- a slotted, resilient profile ring 24 is additionally inserted (see also FIG. 2). This is inserted under prestress into a mounting ring groove 25 in the tool holder 8, which can fully accommodate the profile ring 24. Please refer for this purpose the dashed mounting position 26 of the profile ring.
- the mounting ring groove 25 ends on one side in a contact surface 27 which is inclined at 30 ° -60 °, preferably 45 °, to the longitudinal axis 14.
- the contact surface can also be rounded or concave, but in such a way that at least one part of the contact surface 27 that absorbs compressive forces is inclined approximately by the angle mentioned to the longitudinal axis 14.
- the guide tube 7 has an annular groove 28 which is preferably adapted to the respective profile of the hardened profile ring 24.
- the profile ring 24 here has a circular cross section and the annular groove 28 has a semicircular cross section.
- the detent ring 9 is connected to the guide tube 7 via three elongated rollers 30.
- the rollers 30 lie in the guide tube 7 in three rectilinear notches 31 with a semicircular cross section, which end at the ends (see FIG. 3, in which the rollers 30 have been omitted).
- the detent ring 9 has three rectilinear recesses 32.
- the rollers 30 are first inserted into the notches 31 and then the Rastenring 9 pushed over it.
- an elastic round ring 34 is inserted into a groove in the guide tube 7 from the opposite side, that is to say from the rear.
- the round ring 34 lies against a slope 35 of the detent ring 9.
- the detent ring 9 can be dismantled by removing the round ring 34 and, if necessary, exchanged.
- the hammer sleeve is in two parts and consists of a tool holder and a guide sleeve with an integrally formed detent ring for torque transmission.
- the structure, in particular with regard to the axial connection, is the same with the exemplary embodiment shown in the drawing.
- a two-part design also has the advantage that a high-quality material only needs to be used for the tool holder and the guide tube does not have to be subjected to complete heat treatment. In addition, the production is considerably simplified and cheaper.
- Another advantage is that the components located in the area of the striker can be mounted either from the front or from the rear with a two-part as well as with a three-part hammer sleeve. This is not possible with a one-piece version.
- the profile ring 124 has a square cross section.
- the mounting ring groove 125 with contact surface 127 is unchanged from the first embodiment.
- the mounting position 126 of the profile ring 124 is shown in dashed lines.
- the annular groove 128 also has a similar, flat, inclined contact surface 129 opposite to the contact surface 127.
- the annular groove 128 is so limited that it can not fully accommodate the profile ring 124, but only partially in an inclined position.
- the axial connection with the profile ring 24/124 can, in reverse of the arrangement in the exemplary embodiments shown, also be designed such that the mounting ring groove is located in the outer tube part. Then the profile ring is inserted under pre-tension in the form of a pre-stretch and contracts again after the pipe parts have been joined together.
Abstract
Description
Die Erfindung geht aus von einem Hammer nach dem Oberbegriff des Anspruchs 1. Aus der DE 38 28 309 C2 ist ein Bohrhammer bekannt, bei dem entgegen der sonst üblichen Bauweise das Fürhrungsrohr für das Schlagwerk und die Werkzeugaufnahme zweiteilig sind. Die Verbindung beider Teile erfolgt durch Verriegelungselemente, die als Kugeln in Ausnehmungen beider Teile eingreifen, was eine hohe punktuelle Belastung der Teile mit sich bringt. Aus diesem Grund mußte das Führungsrohr, genauso wie die Werkzeugaufnahme vergütet, beziehungsweise gehärtet werden. Im übrigen erfordert die Konstruktion einen hohen baulichen Aufwand.The invention is based on a hammer according to the preamble of claim 1. From DE 38 28 309 C2, a rotary hammer is known in which, contrary to the otherwise customary design, the guide tube for the striking mechanism and the tool holder are in two parts. The two parts are connected by locking elements which engage as balls in recesses in both parts, which results in a high point load on the parts. For this reason, the guide tube, like the tool holder, had to be tempered or hardened. Otherwise, the construction requires a high level of construction.
Der erfindungsgemäße Schlag- oder Bohrhammer mit den kennzeichnenden Merkmalen des Anspruchs 1 hat demgegenüber den Vorteil, daß die vom Schlagwerk herrührenden hohen Axialkräfte großflächiger übertragen werden. Dies ermöglicht die Verwendung eines ungehärteten Führungsrohrs, wodurch Härteverzug und Nacharbeit am Führungsrohr vermieden werden. Nicht zuletzt geht mit dem geringeren Gewicht der zu härtenden Bauteile auch eine merkliche Entlastung der Umwelt durch wegfallende Härtungsschritte einher.The hammer or rotary hammer according to the invention with the characterizing features of claim 1 has the advantage that the high axial forces resulting from the striking mechanism are transmitted over a large area. This enables the use of an unhardened guide tube, which prevents warping and reworking of the guide tube. Last but not least, the lower weight of the components to be hardened is accompanied by a noticeable relief for the environment due to the omission of hardening steps.
Die Verwendung eines federnden Profilrings und entsprechender, vorzugsweise in ihrer Form angepaßter Nuten im Führungsrohr und in der Werkzeugaufnahme vermeiden Scherbeanspruchungen des Verbindungselements, so daß der Profilring nur noch auf Druck beansprucht wird und an den zu verbindenden Bauteilen keine punktuellen, sondern nur flächige Pressungen zwischen "harten" und "weichen" Bauteilen auftreten. Spätestens durch Einlaufen während des Betriebs passen sich die Nuten genau der Form der Profilringe an, so daß sie mit ihrer gesamten Fläche tragen. Die erfindungsgemäße Axialverbindung hat den weiteren Vorteil, daß die Hammerhülse leicht in Steckmontage zu fertigen ist und daß ein einwandfreier Rundlauf des Werkzeughalters gegeben ist.The use of a resilient profile ring and corresponding, preferably adapted in shape grooves in the guide tube and in the tool holder avoid shear stresses of the connecting element, so that the profile ring is only subjected to pressure and no punctual, but only two-dimensional pressures on the components to be connected between " hard "and" soft "components occur. At the latest by running in during operation, the grooves adapt exactly to the shape of the profile rings, so that they support with their entire surface. The axial connection according to the invention has the further advantage that the hammer sleeve is easy to manufacture in a plug-in assembly and that the tool holder runs smoothly.
Durch die in den abhängigen Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Anspruch 1 angegebenen Bohrhammers möglich. Die Anlagefläche kann in ihrer Schräglage zur Längsachse eben oder auch konkav gewölbt sein, um sich der Außenkontur des verwendeten Profilrings anzupassen. Der Profilring kann insbesondere kreisrunden oder auch ovalen, rechteckigen oder sonstigen Querschnitt haben.Advantageous further developments and improvements of the rotary hammer specified in claim 1 are possible through the measures listed in the dependent claims. In its inclined position with respect to the longitudinal axis, the contact surface can be flat or also concave in order to adapt to the outer contour of the profile ring used. The profile ring can in particular have a circular or oval, rectangular or other cross section.
Besonders vorteilhaft ist es, das an der Werkzeugaufnahme erforderliche Drehmoment über einen Preßsitz zu übertragen, da über den Profilring in Umfangsrichtung nur begrenzt Kräfte übertragen werden können. Weiter vorteilhaft ist ein Rastenring als Kupplungsteil für eine Sicherheitskupplung, der mittels mehrerer Walzen befestigt ist, die in vorzugsweise drei Aussparungen linienförmig anliegen. Damit ist der Rastenring bei Verschleiß leicht austauschbar. Über die Walzen ist bei leichter Fertigungsmöglichkeit eine gute Übertragung des Drehmoments zwischen dem Rastenring und der Führungshülse möglich. Zur axialen Sicherung kann vorteilhafterweise zusätzlich ein Rundring in dem Führungsrohr angebracht sein, der an einer Schräge des Rastenrings gegebenenfalls unter Vorspannung anliegt. Die gesamte Konstruktion ermöglicht es, als Führungsrohr ein nahtlos gezogenes oder geschweißtes weiches Rohrstück zu verwenden, was die Fertigungskosten erheblich reduziert.It is particularly advantageous to transmit the torque required on the tool holder via a press fit, since only limited forces can be transmitted in the circumferential direction via the profile ring. Also advantageous is a detent ring as a coupling part for a safety clutch, which is fastened by means of a plurality of rollers, which preferably lie linearly in three recesses. This makes the catch ring easily replaceable when worn. A good transfer of the torque between the catch ring and the guide sleeve is possible via the rollers with easy manufacturing possibilities. For axial securing, a round ring can advantageously also be attached in the guide tube, which is on a slope of the detent ring may be under tension. The entire construction makes it possible to use a seamlessly drawn or welded soft piece of pipe as a guide tube, which considerably reduces the manufacturing costs.
Die erfindungsgemäße Konstruktion hat den weiteren Vorteil, daß die Verbindungsmittel zwischen Führungsrohr und Werkzeugaufnahme sowie Rastenring sehr platzsparend sind und eine im Vergleich zu einteiligen Ausführungen ebenso dünnwandige Hammerhülse ermöglichen. Die Verbindungen benötigen also keinen zusätzlichen Platz im Gegensatz zu der Lösung gemäß der DE 38 28 309 C2.The construction according to the invention has the further advantage that the connecting means between the guide tube and tool holder as well as the detent ring are very space-saving and enable a thin-walled hammer sleeve in comparison to one-piece designs. The connections therefore do not require any additional space, in contrast to the solution according to DE 38 28 309 C2.
Zwei Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und in der nachfolgenden Beschreibung erläutert. Figur 1 zeigt einen Längsschnitt durch den vorderen Teil eines Bohrhammers, Figur 2 zeigt in vergrößerter Darstellung eine Axialverbindung und Figur 3 zeigt eine perspektivische Ansicht einer Hammerhülse. Figur 4 zeigt ein zweites Ausführungsbeispiel.Two embodiments of the invention are shown in the drawing and explained in the following description. Figure 1 shows a longitudinal section through the front part of a hammer drill, Figure 2 shows an enlarged view of an axial connection and Figure 3 shows a perspective view of a hammer sleeve. Figure 4 shows a second embodiment.
Ein Bohrhammer weist ein Gehäuse 2 aus Kunststoff auf, in dem ein nicht gezeigter Motor untergebracht ist, der eine Zwischenwelle 3 antreibt. Außerdem ist in dem Gehäuse 2 ein Schlagwerk 4 untergebracht, an dessen vorderem Ende ein Werkzeughalter 5 angeordnet ist. Das Schlagwerk 4 liegt innerhalb einer dreiteiligen Hammerhülse 6, die aus einem Führungsrohr 7, einer Werkzeugaufnahme 8 mit Längsachse 14 und einem Rastenring 9 besteht. Das Schlagwerk 4 ist geführt in dem im Gehäuse 2 gelagerten Führungsrohr 7, das als nahtlos gezogenes oder geschweißtes ungehärtetes Rohrstück ausgebildet ist.A hammer drill has a
Mit dem Führungsrohr 7 ist die im wesentlichen ebenfalls rohrförmige Werkzeugaufnahme 8 verbunden, die zum Werkzeughalter 5 gehört und in die ein nicht gezeigtes Werkzeug unmittelbar eingesteckt wird. Die Werkzeugaufnahme 8 kann innerhalb (wie in Figur 1) oder auch außerhalb an dem Führungsrohr 7 anliegen. Weiter sitzt auf dem Führungsrohr 7 der Rastenring 9, der als Teil einer Sicherheitsüberrastkupplung 10 dient. Die Sicherheitskupplung 10 weist in bekannter Weise als Mitnahmekörper Walzen 11 auf, die mit Rastmulden in dem gehärteten Rastenring 9 und mit einem Zahnrad 12 zusammenarbeiten. Das Zahnrad 12 ist gegenüber dem Führungsrohr 7 drehbar und greift in eine Verzahnung 13 der Zwischenwelle 3 ein. Die beiden Teile 9 und 12 der Sicherheitskupplung 10 werden durch eine Druckfeder 15, die das Überrastmoment der Kupplung bestimmt, zusammengepreßt. Die Druckfeder 15 ist in bekannter Weise mittels einer durch Rundringe 16, 17 in dem Führungsrohr 7 gehaltenen Stützscheibe 18 gesichert.The essentially likewise
Innerhalb des Führungsrohrs 7 befindet sich das Schlagwerk 4 mit einem topfförmigen, hin- und hergehend angetriebenen Kolben 20 und einem darin befindlichen Schläger 21. Die Energie des vom dem Kolben 20 angetriebenen Schlägers 21 wird auf einen Döpper 22 und von dort aus auf ein nicht gezeigtes Werkzeug übertragen. Der Kolben 20 ist in dem Führungsrohr 7 geführt.Within the
Führungsrohr 7 und Werkzeugaufnahme 8 überlappen sich in einem gewissen Bereich und sind dort mittels eines Preßsitzes miteinander verbunden. Eine sorgfältige Bearbeitung der gut zugänglichen Kontaktflächen der Preßsitzverbindung gewährleistet gleichzeitig einen guten Rundlauf des Werkzeughalters. Zur insbesondere axialen Sicherung der beiden Teile ist zusätzlich ein geschlitzter, federnder Profilring 24 eingelegt (vergleiche auch Figur 2). Dieser wird unter Vorspannung in eine Montageringnut 25 in der Werkzeugaufnahme 8 eingesetzt, die den Profilring 24 voll in sich aufnehmen kann. Siehe hierzu die gestrichelt gezeichnete Montagestellung 26 des Profilrings. Die Montageringnut 25 läuft einseitig in einer Anlagefläche 27 aus, die um 30° - 60°, vorzugsweise 45° schräg zur Längsachse 14 geneigt ist. Bei einem Profilring 24 mit rundem Querschnitt kann die Anlagefläche auch gerundet, bzw. konkav sein, jedoch so, daß zumindest ein Druckkräfte aufnehmender Teil der Anlagefläche 27 etwa um den genannten Winkel zur Längsachse 14 geneigt ist. Das Führungsrohr 7 weist eine vorzugsweise dem jeweiligen Profil des gehärteten Profilrings 24 angepaßte Ringnut 28 auf. Der Profilring 24 hat hier einen kreisförmigen Querschnitt und die Ringnut 28 einen halbkreisförmigem Querschnitt. Bei fertigmontierter Hammerhülse 6 weitet sich der Profilring 24 aus, so daß er in der Ringnut 28 formschlüssig anliegt und eine flächige Kraftübertragung erfolgen kann. Mit seiner inneren Seite liegt der Profilring an der Anlagefläche 27 an (siehe Kraftpfeil F1).
Im Betrieb des Schlagwerks 5 treten insbesondere beim Übergang in den Leerlauf an der Axialverbindung hohe Momentanbelastungen in Richtung des Pfeiles F in Figur 2 auf. Aufgrund der Neigung der Anlagefläche 27 führt dies zu einer Druckbeanspruchung in Richtung des Pfeiles F1. Dadurch wird das weiche Führungsrohr 7 nicht hauptsächlich an der empfindlichen Kante der Ringnut 28, sondern vorwiegend weiter im Nutgrund beansprucht. Auch eine Scherbeanspruchung des Profilrings 24 wird mit dieser Bauweise vermieden.During operation of the striking mechanism 5, high instantaneous loads in the direction of the arrow F in FIG. 2 occur in particular in the transition to idling at the axial connection. Due to the inclination of the
Der Rastenring 9 ist mit dem Führungsrohr 7 über drei längliche Walzen 30 verbunden. Die Walzen 30 liegen in dem Führungsrohr 7 in drei geradlinigen, an den Enden auslaufenden Einkerbungen 31 mit halbkreisförmigen Querschnitt an (siehe Figur 3, in der die Walzen 30 weggelassen wurden). Der Rastenring 9 weist entsprechend drei geradlinige Aussparungen 32 auf. Bei der Montage werden zunächst die Walzen 30 in die Einkerbungen 31 eingelegt und anschließend der Rastenring 9 darübergeschoben. Zur axialen Fixierung des Rastenrings wird von der Gegenseite, also von hinten, ein elastischer Rundring 34 in eine Nut in dem Führungsrohr 7 eingesetzt. Der Rundring 34 liegt an einer Schräge 35 des Rastenrings 9 an. Der Rastenring 9 kann bei dieser Konstruktion durch Herausnehmen des Rundrings 34 demontiert und gegebenenfalls ausgetauscht werden.The
In einem anderen, nicht gezeigten Ausführungsbeispiel ist die Hammerhülse zweiteilig und besteht aus einer Werkzeugaufnahme und einer Führungshülse mit angeformtem Rastenring für die Drehmomentübertragung. Im übrigen ist der Aufbau insbesondere auch bezüglich der Axialverbindung mit dem in der Zeichnung gezeigten Ausführungsbeispiel gleich. Auch eine zweiteilige Ausführung hat den Vorteil, daß nur für die Werkzeugaufnahme ein hochwertiger Werkstoff verwendet zu werden braucht und das Führungsrohr keiner vollständigen Wärmebehandlung unterzogen werden muß. Außerdem wird die Fertigung dadurch schon erheblich vereinfacht und verbilligt. Ein weiterer Vorteil liegt darin, daß die im Bereich des Döppers gelegenen Bauteile bei einer zweiteiligen wie auch schon bei einer dreiteiligen Hammerhülse entweder von vorne oder von hinten montiert werden können. Dies ist bei einer einteiligen Ausführung nicht möglich.In another embodiment, not shown, the hammer sleeve is in two parts and consists of a tool holder and a guide sleeve with an integrally formed detent ring for torque transmission. Otherwise, the structure, in particular with regard to the axial connection, is the same with the exemplary embodiment shown in the drawing. A two-part design also has the advantage that a high-quality material only needs to be used for the tool holder and the guide tube does not have to be subjected to complete heat treatment. In addition, the production is considerably simplified and cheaper. Another advantage is that the components located in the area of the striker can be mounted either from the front or from the rear with a two-part as well as with a three-part hammer sleeve. This is not possible with a one-piece version.
Im zweiten Ausführungsbeispiel nach Figur 4 hat der Profilring 124 einen quadratischen Querschnitt. Die Montageringnut 125 mit Anlagefläche 127 ist gegenüber dem ersten Ausführungsbeispiel unverändert. Die Montagestellung 126 des Profilrings 124 ist gestrichelt eingezeichnet. Die Ringnut 128 weist schräg gegenüberliegend zu der Anlagefläche 127 ebenfalls eine gleichartige, ebene, geneigte Anlagefläche 129 auf. Im übrigen ist die Ringnut 128 so begrenzt, daß sie den Profilring 124 nicht voll, sondern nur in Schräglage teilweise aufnehmen kann. Dies führt bei der Montage der Axialverbindung zwangsläufig zu einem erwünschten Kippen des Profilrings 124, so daß dieser, wie im ersten Ausführungsbeispiel, schräg zur Trennfuge 133 zwischen Führungsrohr 107 und Werkzeugaufnahme 108, in Richtung der Kraft F1 beansprucht wird. In gleicher Weise werden die Nuten 125 und 128 bei axialen Schlägen auf den Werkzeughalter 108 nicht hauptsächlich an ihren empfindlichen Rändern sondern weiter im Nutgrund beansprucht.In the second exemplary embodiment according to FIG. 4, the profile ring 124 has a square cross section. The mounting
Die Axialverbindung mit dem Profilring 24/124 kann in Umkehrung der Anordnung bei den gezeigten Ausführungsbeispielen auch so gestaltet sein, daß die Montageringnut sich im äußeren Rohrteil befindet. Dann wird der Profilring unter Vorspannung in Form einer Vordehnung eingesetzt und zieht sich nach dem Zusammenfügen der Rohrteile wieder zusammen.The axial connection with the
Claims (11)
- Motor-driven hammer with a casing (2) and a multi-part hammering sleeve (6) mounted therein which has at least one guide tube (7) and a tool socket (8), connected to the latter, which is driven in rotation by a motor, in particular via a gearwheel (12), characterised in that the tool socket (8) is attached to the hammering sleeve (6) by means of an axial connection which has a resilient slotted profiled ring (24) which, in its assembly position, can be inserted completely, under radial prestress, into an annular assembly groove (25) on the tool socket (8), and, with the hammering sleeve (6) fully assembled, engages in an annular groove (28) on the guide tube (7), and in that the annular assembly groove (25) has a bearing surface (27) set obliquely to a normal to the longitudinal axis (14) of the tool socket (8), against which bearing surface the profiled ring (24) rests with the hammering sleeve (6) fully assembled.
- Hammer according to Claim 1, characterised in that the bearing surface (27) is essentially flat and is inclined obliquely to the longitudinal axis (14) of the tool socket (8) at an angle of 30° - 60°, preferably 45°.
- Hammer according to Claim 1 or 2, characterised in that the bearing surface (27) is matched to the outer contour of a profiled ring (24) having a circular cross-section.
- Hammer, in particular hammer drill, according to one of the preceding claims, characterised in that the tool socket (8) and the guide tube (7) are rotationally connected by a press fit.
- Hammer according to one of the preceding claims, characterised in that a latching ring (9) is connected to the guide tube (7) by means of a plurality of rollers (30) which rest in linear fashion in recesses (32), of which there are preferably three, of the latching ring (9).
- Hammer drill according to one of the preceding claims, characterised in that the latching ring (9) is held axially on the guide tube (7) by a round ring (34) and rests on the guide tube by a chamfer (35).
- Hammer drill according to one of the preceding claims, characterised in that the connecting elements (24, 30) rest via a surface against the guide tube (7), in the annular groove (28) or notches (31) of the latter.
- Hammer drill according to one of the preceding claims, characterised in that the latching ring (9) is part of a safety slip/latch (10).
- Hammer drill according to one of the preceding claims, characterised in that the guide tube (7) is manufactured from "soft" unhardened steel.
- Hammer drill according to one of the preceding claims, characterised in that the guide tube (7) is a seamlessly drawn tube.
- Hammer drill according to one of the preceding claims, characterised in that the guide tube (7) is a welded tube.
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4122516 | 1991-07-08 | ||
DE4122516 | 1991-07-08 | ||
DE4215288 | 1992-05-09 | ||
DE4215288A DE4215288A1 (en) | 1991-07-08 | 1992-05-09 | DRILLING HAMMER |
PCT/DE1992/000559 WO1993001027A1 (en) | 1991-07-08 | 1992-07-06 | Percussion drill |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0552328A1 EP0552328A1 (en) | 1993-07-28 |
EP0552328B1 true EP0552328B1 (en) | 1995-10-11 |
Family
ID=25905294
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92914235A Expired - Lifetime EP0552328B1 (en) | 1991-07-08 | 1992-07-06 | Percussion drill |
Country Status (4)
Country | Link |
---|---|
US (1) | US5373905A (en) |
EP (1) | EP0552328B1 (en) |
DE (2) | DE4215288A1 (en) |
WO (1) | WO1993001027A1 (en) |
Families Citing this family (41)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19540396A1 (en) * | 1995-10-30 | 1997-05-07 | Hilti Ag | Drilling and / or chiseling device |
DE19634346A1 (en) * | 1996-08-26 | 1998-03-05 | Schaeffler Waelzlager Kg | Hammer tool for power tool |
DE19707588B4 (en) * | 1997-02-26 | 2005-08-18 | Robert Bosch Gmbh | Machine tool, in particular drill or impact drill or hammer drill |
DE19717712A1 (en) * | 1997-04-18 | 1998-10-22 | Black & Decker Inc | Hammer drill |
DE19955412A1 (en) * | 1999-11-18 | 2001-05-23 | Hilti Ag | Drilling and chiseling device |
GB0008465D0 (en) | 2000-04-07 | 2000-05-24 | Black & Decker Inc | Rotary hammer mode change mechanism |
ES2208623T3 (en) * | 2001-03-07 | 2004-06-16 | Black & Decker Inc. | HAMMER. |
GB0105547D0 (en) | 2001-03-07 | 2001-04-25 | Black & Decker Inc | Tool holder for a rotary hammer or a chisel hammer |
DE10140319A1 (en) * | 2001-08-16 | 2003-03-13 | Bosch Gmbh Robert | Hand tool, in particular drill and / or chisel hammer |
GB0121947D0 (en) | 2001-09-12 | 2001-10-31 | Black & Decker Inc | Tool holder for hammer |
EP1438160B1 (en) * | 2001-10-26 | 2011-01-19 | Black & Decker Inc. | Hammer |
GB0213289D0 (en) * | 2002-06-11 | 2002-07-24 | Black & Decker Inc | Rotary hammer |
GB0214772D0 (en) * | 2002-06-26 | 2002-08-07 | Black & Decker Inc | Hammer |
GB2394516A (en) * | 2002-10-23 | 2004-04-28 | Black & Decker Inc | Power tool |
DE10253973A1 (en) * | 2002-11-20 | 2004-06-03 | Robert Bosch Gmbh | Hand tool, in particular hammer drill or hammer |
DE10253972A1 (en) * | 2002-11-20 | 2004-06-03 | Robert Bosch Gmbh | Hand tool, in particular hammer drill or hammer |
GB2401410A (en) * | 2003-05-03 | 2004-11-10 | Black & Decker Inc | An overload clutch having an elastomeric O-ring stop and tapered splines |
EP1468789A3 (en) * | 2003-04-17 | 2008-06-04 | BLACK & DECKER INC. | Clutch for rotary power tool and rotary power tool incorporating such clutch |
GB2401570B (en) * | 2003-05-12 | 2006-07-05 | Black & Decker Inc | Spindle assembly for hammer drill |
GB0311045D0 (en) * | 2003-05-14 | 2003-06-18 | Black & Decker Inc | Rotary hammer |
DE102004020177A1 (en) * | 2004-04-24 | 2005-11-17 | Robert Bosch Gmbh | Hand tool with a rotating and / or beating drive |
GB2414701A (en) * | 2004-06-05 | 2005-12-07 | Black & Decker Inc | Rotary spindle for a power tool |
DE102004034268B3 (en) * | 2004-07-15 | 2005-12-29 | Wacker Construction Equipment Ag | Rotary hammer with safety coupling |
DE102004058686A1 (en) * | 2004-09-03 | 2006-03-09 | Robert Bosch Gmbh | Power tool with a drive that can be switched over between the operating modes drilling, impact drilling, and chiseling |
EP1674207B1 (en) * | 2004-12-23 | 2008-12-10 | BLACK & DECKER INC. | Power tool |
GB2422569A (en) * | 2005-01-26 | 2006-08-02 | Black & Decker Inc | Rotary hammer |
US20080296034A1 (en) * | 2006-06-06 | 2008-12-04 | Willy Braun | Percussion Mechanism with a Striking Pin and an Associated Catching Mechanism |
WO2008006635A1 (en) * | 2006-07-10 | 2008-01-17 | Robert Bosch Gmbh | Hand-held machine tool |
CA2555533A1 (en) * | 2006-08-08 | 2008-02-08 | Fern Beauchamp | Hammer drill bit chuck attachment |
DE102006061627A1 (en) * | 2006-12-27 | 2008-07-10 | Robert Bosch Gmbh | Schlagwerk an electric hand tool machine |
DE102007001494B3 (en) * | 2007-01-10 | 2008-07-10 | Aeg Electric Tools Gmbh | Hand-held hammer drill |
DE102007000255A1 (en) * | 2007-05-03 | 2008-11-06 | Hilti Aktiengesellschaft | Hand tool with lubricated striking mechanism |
DE102007000365A1 (en) * | 2007-07-04 | 2009-01-08 | Hilti Aktiengesellschaft | Hand tool with friction clutch |
CN101444909B (en) * | 2007-11-27 | 2013-03-27 | 希尔蒂股份公司 | Hand-held tool machine with pneumatic impacting device |
JP5431000B2 (en) * | 2009-04-01 | 2014-03-05 | 株式会社マキタ | Hammer drill |
DE102010002672A1 (en) * | 2010-03-09 | 2011-09-15 | Robert Bosch Gmbh | hammer drill device |
DE102011007660A1 (en) * | 2011-04-19 | 2012-10-25 | Hilti Aktiengesellschaft | Hand tool and manufacturing process |
JP2012254513A (en) * | 2011-06-10 | 2012-12-27 | Makita Corp | Impact tool |
DE102011080800A1 (en) * | 2011-08-11 | 2013-02-14 | Hilti Aktiengesellschaft | Hand tool |
DE102011081617A1 (en) * | 2011-08-26 | 2013-02-28 | Hilti Aktiengesellschaft | Hand-held machine tool |
EP4341047A1 (en) * | 2021-05-21 | 2024-03-27 | Milwaukee Electric Tool Corporation | Chisel hammer |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
DE3429140A1 (en) * | 1984-08-08 | 1986-02-20 | Black & Decker Inc., Newark, Del. | DRILLING HAMMER WITH A PNEUMATIC STRIKE |
DE3506695A1 (en) * | 1985-02-26 | 1986-08-28 | Robert Bosch Gmbh, 7000 Stuttgart | DRILLING HAMMER |
DE3828309C3 (en) * | 1988-08-20 | 1998-07-30 | Bosch Gmbh Robert | Hammer drill |
-
1992
- 1992-05-09 DE DE4215288A patent/DE4215288A1/en not_active Withdrawn
- 1992-07-06 WO PCT/DE1992/000559 patent/WO1993001027A1/en active IP Right Grant
- 1992-07-06 EP EP92914235A patent/EP0552328B1/en not_active Expired - Lifetime
- 1992-07-06 US US07/989,005 patent/US5373905A/en not_active Expired - Lifetime
- 1992-07-06 DE DE59203993T patent/DE59203993D1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
WO1993001027A1 (en) | 1993-01-21 |
US5373905A (en) | 1994-12-20 |
DE4215288A1 (en) | 1993-01-14 |
EP0552328A1 (en) | 1993-07-28 |
DE59203993D1 (en) | 1995-11-16 |
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