EP0469356A1 - Porte outil pour des marteaux perforateurs - Google Patents

Porte outil pour des marteaux perforateurs Download PDF

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Publication number
EP0469356A1
EP0469356A1 EP19910111530 EP91111530A EP0469356A1 EP 0469356 A1 EP0469356 A1 EP 0469356A1 EP 19910111530 EP19910111530 EP 19910111530 EP 91111530 A EP91111530 A EP 91111530A EP 0469356 A1 EP0469356 A1 EP 0469356A1
Authority
EP
European Patent Office
Prior art keywords
tool holder
shaft
hammer
plug
tool
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.)
Granted
Application number
EP19910111530
Other languages
German (de)
English (en)
Other versions
EP0469356B1 (fr
Inventor
Manfred Bleicher
Ulrich Dipl.-Ing. Bohne
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0469356A1 publication Critical patent/EP0469356A1/fr
Application granted granted Critical
Publication of EP0469356B1 publication Critical patent/EP0469356B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 is based on 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.
  • a drill chuck arranged in extension to the tool holder of the rotary hammer 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.
  • 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 body 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 bodies 12 do 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 hammer drill mers via the rotary driving bars 11 and the rotary driving grooves 26 on the shaft 24 and further on 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)
  • Jigs For Machine Tools (AREA)
  • Gripping On Spindles (AREA)
EP91111530A 1990-08-02 1991-07-11 Porte outil pour des marteaux perforateurs Expired - Lifetime EP0469356B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9011315U 1990-08-02
DE9011315U DE9011315U1 (fr) 1990-08-02 1990-08-02

Publications (2)

Publication Number Publication Date
EP0469356A1 true EP0469356A1 (fr) 1992-02-05
EP0469356B1 EP0469356B1 (fr) 1993-10-20

Family

ID=6856142

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91111530A Expired - Lifetime EP0469356B1 (fr) 1990-08-02 1991-07-11 Porte outil pour des marteaux perforateurs

Country Status (3)

Country Link
EP (1) EP0469356B1 (fr)
JP (1) JP3100681B2 (fr)
DE (2) DE9011315U1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2310392A (en) * 1996-02-06 1997-08-27 Bosch Gmbh Robert A mount of a needle chisel for a hammer drill

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0108411A1 (fr) * 1982-11-10 1984-05-16 Eugen Lutz GmbH & Co. Maschinenfabrik Machine à percer
EP0199842A1 (fr) * 1985-05-02 1986-11-05 Licentia Patent-Verwaltungs-GmbH Perforateur à percussion électropneumatique
DE3637354A1 (de) * 1986-11-03 1988-05-05 Bosch Gmbh Robert Werkzeughalter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0108411A1 (fr) * 1982-11-10 1984-05-16 Eugen Lutz GmbH & Co. Maschinenfabrik Machine à percer
EP0199842A1 (fr) * 1985-05-02 1986-11-05 Licentia Patent-Verwaltungs-GmbH Perforateur à percussion électropneumatique
DE3637354A1 (de) * 1986-11-03 1988-05-05 Bosch Gmbh Robert Werkzeughalter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2310392A (en) * 1996-02-06 1997-08-27 Bosch Gmbh Robert A mount of a needle chisel for a hammer drill
GB2310392B (en) * 1996-02-06 1998-04-08 Bosch Gmbh Robert A device for mounting an auxiliary device on a hand machine tool

Also Published As

Publication number Publication date
DE9011315U1 (fr) 1991-11-28
JPH04360740A (ja) 1992-12-14
EP0469356B1 (fr) 1993-10-20
DE59100501D1 (de) 1993-11-25
JP3100681B2 (ja) 2000-10-16

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