EP0469356B1 - Tool holder for hammer drills - Google Patents
Tool holder for hammer drills Download PDFInfo
- Publication number
- EP0469356B1 EP0469356B1 EP91111530A EP91111530A EP0469356B1 EP 0469356 B1 EP0469356 B1 EP 0469356B1 EP 91111530 A EP91111530 A EP 91111530A EP 91111530 A EP91111530 A EP 91111530A EP 0469356 B1 EP0469356 B1 EP 0469356B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tool holder
- shank
- hammer drill
- slip
- tool receptacle
- 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
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D17/00—Details of, or accessories for, portable power-driven percussive tools
- B25D17/005—Attachments or adapters placed between tool and hammer
-
- 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
Definitions
- the invention relates to a tool holder according to the preamble of claim 1.
- a tool holder which can be coupled as an attachment with a rotary hammer, is known from DE-PS 36 37 354. In this case, only the striking movement is transmitted to the tool holder. Rotary drilling is therefore not possible with this tool holder.
- the tool holders for grooved shank tools attached to rotary hammers are also not suitable for precise rotary drilling due to the wear on the mounting holes during hard impact operations. Because of the poor concentricity, the quality of holes, for example in metal, is mostly unsatisfactory.
- the tool holder according to the invention with the characterizing features of claim 1 has the advantage that exact round bores can be made with a hammer drill even when the tool holder is knocked out. For this purpose, the transmission of the hammer action is suppressed and the tool holder is attached to the clamping neck of the hammer drill.
- An in An extension to the tool holder of the hammer drill and connected to the rotary drive of the hammer, in particular a three-jaw chuck, ensures exact concentricity of the drilling tool used.
- the mounting of the shaft of the tool holder corresponding to a drilling spindle via two spaced roller bearings further contributes to a quiet and exact concentricity of the drill chuck.
- the shaft sits with play in the tool holder of the rotary hammer, so that concentricity inaccuracies are compensated for.
- the tool holder is quick and easy to assemble and disassemble. All usual additional devices such as additional handle can be attached to the clamping neck of the tool holder, which has the same diameter as that of the rotary hammer.
- FIG. 1 An embodiment of the invention is shown in the drawing and explained in more detail in the following description.
- the figure shows a longitudinal section through a hammer drill with a tool holder attached.
- the percussion mechanism 3 which is known per se, essentially consists of a rotary wobble finger 5 which drives a piston 6 back and forth.
- the striker 7 In the cup-shaped piston 6 there is a striker 7 which is accelerated forward by an air cushion formed between the piston and the striker in the direction of the tool holder 4.
- the striker 7 strikes another striking body, a striker 8.
- the striker 8 projects into the tool holder 4 and strikes the end of the shaft when the tool is inserted into the tool holder 4.
- the tool holder 4 has a receiving bore 10 in which two axially extending rotary driving bars 11 are arranged opposite one another. Otherwise, the tool holder corresponds to that from DE-PS 36 37 354. In particular, it also has spring-loaded locking bodies 12.
- a clamping neck 14 is arranged on the tool holder 4 on the housing 2 of the hammer drill.
- a tool holder 15 with its push-on part 16 made of plastic is placed on the clamping neck 14.
- the plug-on part 16 like the tool holder according to DE-PS 36 37 354, has a slot 17 and can be firmly clamped onto the clamping neck 14 by means of a clamping screw, not shown, reaching through a bore 18.
- two roller bearings 20, 21 are arranged at a distance from one another in the area in front of the tool holder 4. The distance between the roller bearings 20, 21 is determined by a spacer sleeve 22.
- a shaft 24 is mounted in the roller bearings 20, 21 and engages with one end 25 in the tool holder 4.
- the shaft 24 has, as a means for rotational driving, two opposite rotational driving grooves 26, in which the rotary driving bars 11 engage. Otherwise, the shaft end 25 has a cylindrical cross section, so that in particular the locking body 12 does not engage in the shaft end 25.
- the shaft end 25 is only so far in the tool holder 4 that it can no longer be reached by the striker 8 in its foremost position.
- the shaft 24 carries a thread 27 onto which a commercially available drill chuck is screwed.
- the drill chuck 28 can in particular be designed as a three-jaw chuck into which drilling tools can be clamped exactly centrally.
- a clamping neck 29 is formed on the plug-on part 16 of the tool holder 15 in the area of the roller bearings 20, 21, and its diameter corresponds to that of the clamping neck 14 of the rotary hammer.
- the tool holder 15 transmits the rotary movement of the tool holder 4 of the rotary hammer via the rotary driver bars 11 and the rotary driver grooves 26 to the shaft 24 and further to the drill chuck 28.
- the striking movement of the striking mechanism 3 is not transmitted to the tool holder 15.
- the tool holder 15 is axially fixed on the clamping neck 14 of the hammer drill. Any wear on the receiving bore 10 has no effect on the concentricity of the drill chuck 28, since the shaft 24 sits in the receiving bore 10 with play. This is achieved in that the shaft end 25 has a slightly smaller diameter than the tool shanks usually used in the tool holder 4.
- the concentricity of the drill chuck 28 is rather ensured by the tight fit of the plug-on part 16 on the clamping neck 14 of the hammer drill.
- the invention is not limited to the exemplary embodiments shown.
- the means for rotary driving as different, e.g. B. not diametrically opposed but otherwise associated grooves or formed as strips.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gripping On Spindles (AREA)
- Jigs For Machine Tools (AREA)
Description
Die Erfindung geht aus von einem Werkzeughalter nach der Gattung des Anspruchs 1. Ein solcher als Vorsatzgerät mit einem Bohrhammer koppelbarer Werkzeughalter ist aus der DE-PS 36 37 354 bekannt. Hierbei wird lediglich die Schlagbewegung auf den Werkzeughalter übertragen. Mit diesem Werkzeughalter ist also Drehbohren nicht möglich. Die an Bohrhämmern angebrachten Werkzeugaufnahmen für Nutenschaftwerkzeuge eignen sich aufgrund des Verschleißes an den Aufnahmebohrungen beim harten Schlagbetrieb ebenfalls nicht für exaktes Drehbohren. Wegen der schlechten Rundlaufeigenschaften ist die Qualität von Bohrungen, beispielsweise in Metall meist unbefriedigend.The invention relates to a tool holder according to the preamble of claim 1. Such a tool holder, which can be coupled as an attachment with a rotary hammer, is known from DE-PS 36 37 354. In this case, only the striking movement is transmitted to the tool holder. Rotary drilling is therefore not possible with this tool holder. The tool holders for grooved shank tools attached to rotary hammers are also not suitable for precise rotary drilling due to the wear on the mounting holes during hard impact operations. Because of the poor concentricity, the quality of holes, for example in metal, is mostly unsatisfactory.
Der erfindungsgemäße Werkzeughalter mit den kennzeichnenden Merkmalen des Anspruchs 1 hat demgegenüber den Vorteil, daß mit einem Bohrhammer auch bei ausgeschlagener Werkzeugaufnahme exakte Rundbohrungen ausgeführt werden können. Zu diesem Zweck wird die Übertragung der Schlagwerkstätigkeit unterdrückt und der Werkzeughalter am Spannhals des Bohrhammers befestigt. Ein in Verlängerung zur Werkzeugaufnahme des Bohrhammers angeordnetes und mit dem Drehantrieb des Hammers verbundenes Bohrfutter, insbesondere ein Dreibackenfutter, stellt einen exakten Rundlauf des eingesetzten Bohrwerkzeugs sicher. Die Lagerung des einer Bohrspindel entsprechenden Schaftes des Werkzeughalters über zwei beabstandete Wälzlager trägt weiter zu einen ruhigen und exakten Rundlauf des Bohrfutters bei. Der Schaft sitzt mit Spiel in dem Werkzeughalter des Bohrhammers, sodaß Rundlaufungenauigkeiten dadurch ausgeglichen werden. Der Werkzeughalter ist als Vorsatzgerät leicht und schnell an- und abzubauen. An den Spannhals der Werkzeugaufnahme, die den gleichen Durchmesser aufweist wie der des Bohrhammers, lassen sich alle üblichen Zusatzgeräte wie z.B. Zusatzhandgriff anbringen.The tool holder according to the invention with the characterizing features of claim 1 has the advantage that exact round bores can be made with a hammer drill even when the tool holder is knocked out. For this purpose, the transmission of the hammer action is suppressed and the tool holder is attached to the clamping neck of the hammer drill. An in An extension to the tool holder of the hammer drill and connected to the rotary drive of the hammer, in particular a three-jaw chuck, ensures exact concentricity of the drilling tool used. The mounting of the shaft of the tool holder corresponding to a drilling spindle via two spaced roller bearings further contributes to a quiet and exact concentricity of the drill chuck. The shaft sits with play in the tool holder of the rotary hammer, so that concentricity inaccuracies are compensated for. The tool holder is quick and easy to assemble and disassemble. All usual additional devices such as additional handle can be attached to the clamping neck of the tool holder, which has the same diameter as that of the rotary hammer.
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Die Figur zeigt einen Längsschnitt durch einen Bohrhammer mit aufgesetztem Werkzeughalter.An embodiment of the invention is shown in the drawing and explained in more detail in the following description. The figure shows a longitudinal section through a hammer drill with a tool holder attached.
Von einem Bohrhammer ist nur der vordere, in einem Gehäuse 2 untergebrachte Teil gezeigt, der ein Schlagwerk 3 und eine Werkzeugaufnahme 4 zeigt. Das an sich bekannte Schlagwerk 3 besteht im wesentlichen aus einem drehend angetriebenen Taumelfinger 5, der einen Kolben 6 hin- und hergehend antreibt. In dem topfförmig ausgebildeten Kolben 6 befindet sich ein Schläger 7, der von einem zwischen Kolben und Schläger ausgebildeten Luftpolster nach vorn in Richtung auf die Werkzeugaufnahme 4 beschleunigt wird. Der Schläger 7 trifft dabei auf einen weiteren Schlagkörper, einen Döpper 8. Der Döpper 8 ragt in die Werkzeugaufnahme 4 hinein und schlägt bei in die Werkzeugaufnahme 4 eingesetztem Werkzeug auf dessen Schaftende.Only the front part of a rotary hammer, which is accommodated in a housing 2, is shown, which shows a
Die Werkzeugaufnahme 4 hat eine Aufnahmebohrung 10, in der zwei sich axial erstreckende Drehmitnahmeleisten 11 gegenüberliegend angeordnet sind. Im übrigen entspricht die Werkzeugaufnahme derjenigen aus der DE-PS 36 37 354. Insbesondere weist sie auch federbelastete Verriegelungskörper 12 auf.The tool holder 4 has a
Am Gehäuse 2 des Bohrhammers ist auf die Werkzeugaufnahme 4 hingerichtet ein Spannhals 14 angeordnet. Auf den Spannhals 14 ist ein Werkzeughalter 15 mit seinem Aufsteckteil 16 aus Kunststoff aufgesetzt. Das Aufsteckteil 16 weist wie der Werkzeughalter nach der DE-PS 36 37 354 einen Schlitz 17 auf und ist mittels einer nicht gezeigten durch eine Bohrung 18 greifende Spannschraube auf den Spannhals 14 fest aufspannbar. Innerhalb des Aufsteckteils 16 sind im Bereich vor der Werkzeugaufnahme 4 mit Abstand zueinander zwei Wälzlager 20, 21 angeordnet. Der Abstand zwischen den Wälzlagern 20, 21 wird durch eine Distanzhülse 22 bestimmt. In den Wälzlagern 20, 21 ist ein Schaft 24 gelagert, der mit einem Ende 25 in die Werkzeugaufnahme 4 eingreift. An dem Ende 25 weist der Schaft 24 als Mittel zur Drehmitnahme zwei gegenüberliegende Drehmitnahmenuten 26 auf, in die die Drehmitnahmeleisten 11 eingreifen. Ansonsten weist das Schaftende 25 einen zylindrischen Querschnitt auf, so daß insbesondere die Verriegelungskörper 12 nicht in das Schaftende 25 eingreifen. Das Schaftende 25 steckt nur soweit in der Werkzeugaufnahme 4, daß es von dem Döpper 8 in dessen vorderster Stellung nicht mehr erreicht werden kann. An seinem gegenüberliegenden Ende trägt der Schaft 24 ein Gewinde 27, auf das ein handelsübliches Bohrfutter aufgeschraubt ist. Das Bohrfutter 28 kann insbesondere als Dreibackenfutter ausgebildet sein, in das sich Bohrwerkzeuge exakt zentrisch spannen lassen. An dem Aufsteckteil 16 des Werkzeughalters 15 ist im Bereich der Wälzlager 20, 21 ein Spannhals 29 ausgebildet, der in seinem Durchmesser demjenigen Spannhals 14 des Bohrhammers entspricht.A
Der Werkzeughalter 15 überträgt die Drehbewegung der Werkzeugaufnahme 4 des Bohrhammers über die Drehmitnahmeleisten 11 und die Drehmitnahmenuten 26 auf den Schaft 24 und weiter auf das Bohrfutter 28. Die Schlagbewegung des Schlagwerks 3 wird nicht auf den Werkzeughalter 15 übertragen. Der Werkzeughalter 15 sitzt axial fest auf dem Spannhals 14 des Bohrhammers. Etwaiger Verschleiß an der Aufnahmebohrung 10 bleibt ohne Auswirkung auf den Rundlauf des Bohrfutters 28, da der Schaft 24 mit Spiel in der Aufnahmebohrung 10 sitzt. Dies wird dadurch erreicht, daß das Schaftende 25 einen etwas geringeren Durchmesser aufweist, als die üblicherweise in die Werkzeugaufnahme 4 eingesetzten Werkzeugschäfte. Der Rundlauf des Bohrfutters 28 wird vielmehr durch den festen Sitz des Aufsteckteils 16 an dem Spannhals 14 des Bohrhammers gewährleistet.The
Die Erfindung beschränkt sich nicht auf die gezeigten Ausführungsbeispiele. Insbesondere können die Mittel zur Drehmitnahme als anders, z. B. nicht diametral gegenüberliegende sondern anderweitig einander zugeordnete Nuten oder als Leisten ausgebildet sein.The invention is not limited to the exemplary embodiments shown. In particular, the means for rotary driving as different, e.g. B. not diametrically opposed but otherwise associated grooves or formed as strips.
Claims (7)
- Toolholder with a slip-on part (16) to be fastened to the clamping collar (14) of a hammer drill, for coupling to a tool receptacle (4) for grooved-shanked tools of the hammer drill, and with a shank (24) engaging into the tool receptacle (4) of the hammer drill, characterised in that the shank (24) is mounted rotatably in the slip-on part (16) and has means (26) which, in engagement with the tool receptacle (24), serve for rotary take-up, and in that the length of the shank (24) is determined so that it under no circumstances touches the striking bodies (7, 8).
- Toolholder according to Claim 1, characterised in that it has a drill chuck (28), the latter being connected fixedly in terms of rotation to the shank (24).
- Toolholder according to Claim 1 or 2, characterised in that the shank (24) is mounted in the slip-on part in two rolling bearings (20, 21) spaced from one another.
- Toolholder according to one of the preceding claims, characterised in that the shank (24) has longitudinal grooves (26) for engagement into rotary take-up strips (11) of the tool receptacle (4) of the hammer drill.
- Toolholder according to one of the preceding claims, characterised in that the shank (24) is seated with play in the receiving bore (10) of the tool receptacle (4) of the hammer drill.
- Toolholder according to one of the preceding claims, characterised in that the slip-on part (16) consists of plastic.
- Toolholder according to one of the preceding claims, characterised in that the slip-on part (16) has, preferably in the region of the rolling bearings (20, 21), a clamping collar (29) which has the same diameter as the clamping collar (14) of the hammer drill.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE9011315U DE9011315U1 (en) | 1990-08-02 | 1990-08-02 | Tool holder for hammer drills |
DE9011315U | 1990-08-02 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0469356A1 EP0469356A1 (en) | 1992-02-05 |
EP0469356B1 true EP0469356B1 (en) | 1993-10-20 |
Family
ID=6856142
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91111530A Expired - Lifetime EP0469356B1 (en) | 1990-08-02 | 1991-07-11 | Tool holder for hammer drills |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0469356B1 (en) |
JP (1) | JP3100681B2 (en) |
DE (2) | DE9011315U1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19604169A1 (en) * | 1996-02-06 | 1997-08-07 | Bosch Gmbh Robert | Holder of an additional device for hand machine tools |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3241528C2 (en) * | 1982-11-10 | 1986-04-10 | Eugen Lutz GmbH u. Co Maschinenfabrik, 7130 Mühlacker | Tool chuck for a hammer drill |
DE3515661A1 (en) * | 1985-05-02 | 1986-11-06 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | ELECTROPNEUMATIC TORQUE DRILL |
DE3637354A1 (en) * | 1986-11-03 | 1988-05-05 | Bosch Gmbh Robert | Tool holder |
-
1990
- 1990-08-02 DE DE9011315U patent/DE9011315U1/en not_active Expired - Lifetime
-
1991
- 1991-07-11 DE DE91111530T patent/DE59100501D1/en not_active Expired - Fee Related
- 1991-07-11 EP EP91111530A patent/EP0469356B1/en not_active Expired - Lifetime
- 1991-07-30 JP JP03189678A patent/JP3100681B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
EP0469356A1 (en) | 1992-02-05 |
JPH04360740A (en) | 1992-12-14 |
JP3100681B2 (en) | 2000-10-16 |
DE59100501D1 (en) | 1993-11-25 |
DE9011315U1 (en) | 1991-11-28 |
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