EP2883662A1 - Porte-outil - Google Patents

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Publication number
EP2883662A1
EP2883662A1 EP13197272.1A EP13197272A EP2883662A1 EP 2883662 A1 EP2883662 A1 EP 2883662A1 EP 13197272 A EP13197272 A EP 13197272A EP 2883662 A1 EP2883662 A1 EP 2883662A1
Authority
EP
European Patent Office
Prior art keywords
tool holder
side surfaces
face
tool
web
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.)
Withdrawn
Application number
EP13197272.1A
Other languages
German (de)
English (en)
Inventor
Ralf Meixner
Udo Hauptmann
Horst Stroissnigg
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.)
Hilti AG
Original Assignee
Hilti AG
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 Hilti AG filed Critical Hilti AG
Priority to EP13197272.1A priority Critical patent/EP2883662A1/fr
Priority to PCT/EP2014/076962 priority patent/WO2015086552A1/fr
Priority to EP14809028.5A priority patent/EP3079859A1/fr
Publication of EP2883662A1 publication Critical patent/EP2883662A1/fr
Withdrawn legal-status Critical Current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
    • B25D17/08—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
    • 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
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/065—Details regarding assembling of the tool
    • B25D2250/075—Assembled by welding

Definitions

  • the present invention relates to a tool holder for a rotating and chiseling hand tool, in particular a combination hammer.
  • US 7,338,051 describes a tool holder for a combination hammer.
  • the tool holder has a tubular base body, in the interior of which the drill is received along its axis movable. Locking elements engage in the interior and secure the drill against falling out.
  • the tool holder webs which engage in corresponding grooves of the drill to transmit torque from the tool holder to the drill.
  • the webs are made of a carbide are used as inserts in the body. The attachment of the webs takes place in overlapping holes in the body, a fixation can be done by gluing, press fit, soldering or welding.
  • the use of bars made of carbide leads to a very high wear of the drill. End pieces of the webs tilt in longitudinal grooves of the drill and knock them out.
  • the tool holder according to the invention for a rotating and chiseling hand tool has a tubular base body which surrounds a receiving space for receiving a tool coaxial with an axis and which has at least one opening in the radial direction.
  • An insert is inserted into the breakthrough and has a radially projecting into the receiving space web.
  • the web has along the axis successively a main portion and a rear portion.
  • the main section has along the working axis a constant, limited by a roof surface and two opposite mutually inclined side surfaces, trapezoidal cross-section.
  • the rear portion has a plane facing away from the main portion flat end face and two opposing inlet surfaces.
  • the preferably flat inlet surfaces connect the end face with one of the side surfaces.
  • the inlet surfaces are inclined relative to the side surfaces between 2 degrees and 10 degrees. The little compared to the side surfaces employed inlet surfaces prove to be more favorable to align the tool along the webs compared to arcuate end pieces.
  • Fig. 1 shows as an example of a chiseling hand tool machine schematically a combination hammer 1.
  • the combination hammer 1 has a tool holder 2, in which a shank end 3 of a tool, for example one of the hammer drill 4, can be used.
  • a primary drive of the combihammer 1 is a motor 5, which drives a hammer mechanism 6 and an output shaft 7 .
  • a user can cause the combination hammer 1 by means of a handle 8 and take means of a system switch 9, the combination hammer 1 is in operation.
  • the combination hammer 1 rotates the hammer drill 4 continuously about a working axis 10 and can beat the hammer drill 4 in the direction of impact 11 along the working axis 10 in a substrate.
  • the striking mechanism 6 is preferably a motor-driven pneumatic percussion 6.
  • a racket 12 is coupled via an air spring 13 to one of the motor 5 along a working axis 10 reciprocating piston 14 .
  • the bat 12 strikes directly or indirectly by an anvil 15 on the shaft end . 3
  • the tool holder 2 is shown in detail in FIG Fig. 2 in a longitudinal section and in a cross section in Fig. 3 shown.
  • the tool holder 2 has a driven by the output shaft 7 hollow spindle 16 (main body) with a receiving space 17 for the tool 4.
  • the hammer drill 4 can by an output-side opening 18 in the insertion direction (opposite the direction of impact 11 ) are inserted into the receiving space 17 .
  • the receiving space 17 is preferably complementary to the shaft end 3, for example cylindrical.
  • the pawls 19 are inserted into slots 20 in a wall of the hollow spindle 16 .
  • a radial inhibition of the pawls 19 is effected by a locking ring 21, on which radially from the inside fitting the pawls 19 partially protrude into the receiving space 17 .
  • the projecting into the receiving space 17 part of the pawls 19 can engage in the locking groove of the tool 4 .
  • a spring-loaded slider 22 holds the pawls 19 within the locking ring 21, ie axially overlapping with the locking ring 21 .
  • the pawls 19 When inserting the hammer drill 4 , the pawls 19 are moved against the spring-loaded slide 22 and get out of engagement with the locking ring 21. The pawls 19 can dodge radially and release the receiving space 17 . The pawls 19 can be displaced by an actuating sleeve 23 against the spring-loaded slide 22 , whereby the radial inhibition of the pawls 19 is released and the hammer drill 4 can be removed.
  • the rotational movement of the hollow spindle 16 are transmitted to the hammer drill 4 via webs 24 projecting into the receiving space 17 .
  • the exemplary embodiment of the tool holder 2 has a web 24.
  • Alternative tool holder 4, in particular for large diameter drill bits may have two or webs 24 .
  • the web 24 is along the working axis 10 at the height of the slots 20 for the pawls 19th
  • the web 24 is the projecting into the receiving space 17 part of an insert 25.
  • the insert 25 has the web 24 and a base 26.
  • the hollow spindle 16 has a recess 27 for each web 24 , in which the base 26 inserted in the radial direction 28 is.
  • the recess 27 is complementary to the base 26.
  • the base 26 is permanently fixed by soldering in the recess 27 .
  • the total insert 25 is preferably monolithic, ie, made of one material and without joining zones.
  • the insert 25 may be made of a tool steel.
  • the hollow spindle 16 is made of a different material, for example made of one.
  • the web 24 has a main portion 29.
  • the main portion 29 transmits substantially all the torque to the combination hammer 1.
  • the exposed outer surfaces, in particular a roof surface 30 and two side surfaces 31, of the main portion 29 are parallel to the working axis 10 .
  • the outer surfaces define a trapezoidal Cross-section which is constant along the working axis 10 over the entire length of the main portion 29 .
  • the roof surface 30 is perpendicular to a radial direction 28 (vertical direction).
  • the side surfaces 31 preferably adjoin the opposite longitudinal edges of the roof surface 30 .
  • the side surfaces 31 are preferably inclined to each other between 20 degrees and 40 degrees.
  • the web 24 is thus preferably wider at its bottom surface, ie at the base 26, than at the roof surface 30.
  • An average width 32 of the web 24 is approximately equal, eg less than 20%, to the height 33 of the web 24.
  • a length 34 of the main portion 29 is at least three times the height 33.
  • the web 24 must be sufficiently long for the transmission of
  • the web 24 has a rear portion 35 which is arranged in the direction of impact 11 after the main portion 29 .
  • the rear portion 35 has an end face 36 which points in the direction of impact 11 .
  • the end face 36 is preferably trapezoidal.
  • the normal of the end face 36 lies in a plane spanned by the working axis 10 and the vertical direction 28.
  • the exemplary end face 36 is not inclined perpendicular to the working axis 10 but between 70 degrees and 80 degrees.
  • the end face 36 is preferably flat.
  • the end face 36 is slightly narrower than the main section 29, ie smaller than the trapezoidal cross section.
  • a width 37 of the end face 36 on the base 26 is between 80% and 90% of the width 32 of the cross section of the base 26th
  • the inlet surfaces 38 adjoin the end face 36 laterally.
  • the inlet surfaces 38 connect the end face 36 with the side surfaces 31.
  • the flat inlet surfaces 38 are slightly inclined relative to the side surfaces 31 , preferably between 2 degrees and 10 degrees.
  • the inlet surfaces 38 preferably extend from the base 26 to the roof surface 30.
  • a length 39 of the inlet surfaces 38 corresponds approximately to the distance between the two inlet surfaces 38, ie the width 37 of the web 24th
  • the base 26 is longer and wider than the bridge 24.
  • the base 26 is closed at its longitudinal ends by semi-cylindrical end pieces. Between the two end pieces of the base 26 is substantially cuboid.
  • the recess 27 also has correspondingly semi-cylindrical ends with a cuboid intermediate region.
  • the hollow spindle 16 is made, for example, from a tubular blank.
  • the tubular blank can be cold expanded to the desired inner profile. Subsequently, the inner and outer surfaces are machined.
  • the slots 20 for the pawls 19 and the recess 27 for the insert 25 for example with a milling head, formed. Bearing sections can be trimmed to a desired diameter and polished.
  • the steel of the tubular blank is preferably a low alloy steel, e.g. 16MnCr5.
  • a carbon content is less than 0.4 wt%, preferably more than 0.1 wt%.
  • the steel is low alloyed; the total admixture of alloying elements is less than 5% by weight.
  • Chromium can have the highest proportion here, e.g. between 1.0 and 2.2 wt .-%.
  • the steel can also be unalloyed.
  • the carbon content is also less than 0.4 wt .-%.
  • the insert 25 is preferably produced without machining.
  • the insert 25 is forged, for example, from a steel blank.
  • the shaping takes place for example by a die, in which the blank is inserted.
  • the die for example, can be made in several parts and has the complementary shape to the insert 25, ie the web 24 with the base 26.
  • the blank is forged at a temperature between 950 Celsius and 1150 Celsius. This exceeds the AC3 temperature of the steel, which causes austenite to form.
  • the insert 25 cools to room temperature , preferably in air.
  • the insert 25 can alternatively be produced by means of a precision casting process.
  • the blank for use 25 is a tool steel, eg X155CrVMo12-1.
  • the carbon content is greater than 0.8% by weight, preferably less than 2.2% by weight.
  • the blank is highly alloyed, the proportion of total alloying elements is greater than 7 wt .-%.
  • the insert 25 is placed in the recess 27 of the hollow spindle 16 .
  • a solder preferably a copper-containing solder, is introduced between the insert 25 and the hollow spindle 16 .
  • the insert 25 is soldered to the hollow spindle 16 , eg in a soldering oven, at a temperature in the range of 1030 Celsius and 1070 Celsius. The soldering process lasts between 20 minutes and 60 minutes.
  • the steels of hollow mandrel 16 and insert 25 are heated above their recrystallization temperature. The tool steel loses hardness.
  • the composite of hollow spindle 16 and insert 25 cools , preferably in air or in another gas atmosphere.
  • the composite is heat treated in an immediately subsequent step.
  • the composite is heated to a temperature between 800 Celsius and 950 Celsius.
  • the temperature can be raised in two or more steps to minimize thermomechanical stresses in the composite.
  • the composite is held at temperature for 30 minutes to 2 hours.
  • the temperature is well below a temperature which is suitable for hardening the tool steel.
  • this temperature is atypical for the three times repeated heat treatments on tool steel, which take place at a maximum temperature between 400 and 600 Celsius, to obtain the typical hardness and load capacity of a tool steel.
  • the heat treatment takes place in a carbon-containing atmosphere, for example in a gas carburization furnace.
  • the carbon level is increased by adding eg methanol and propane.
  • a C-level control preferably keeps the carbon level constant during the heat treatment.
  • the carbon level is chosen so that the hollow spindle 16 is carburized.
  • the C-level can be taken for the selected steel tables or simulations, or be determined in a few experiments.
  • a measurement of the C-level can be determined in a known manner indirectly via the partial pressure of oxygen.
  • the C level is further adjusted so that the tool steel of the insert 25 is not carburized. For example, the C level is between 0.7 and 0.75.
  • the carbon can be lowered or maintained in the insert 25 .
  • the heat treatment is terminated by rapid quenching, for example in oil.
  • the composite is cured.
  • the heat treatment is followed by a single tempering at a low temperature between 180 Celsius and 210 Celsius to relieve internal stresses.
  • quenching the composite to room temperature can be followed by cooling to -60 Celsius to -120 Celsius. Freezing may favor hardening of the composite. The one-off tempering follows the freezing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
EP13197272.1A 2013-12-13 2013-12-13 Porte-outil Withdrawn EP2883662A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP13197272.1A EP2883662A1 (fr) 2013-12-13 2013-12-13 Porte-outil
PCT/EP2014/076962 WO2015086552A1 (fr) 2013-12-13 2014-12-09 Porte-outil
EP14809028.5A EP3079859A1 (fr) 2013-12-13 2014-12-09 Porte-outil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13197272.1A EP2883662A1 (fr) 2013-12-13 2013-12-13 Porte-outil

Publications (1)

Publication Number Publication Date
EP2883662A1 true EP2883662A1 (fr) 2015-06-17

Family

ID=49765382

Family Applications (2)

Application Number Title Priority Date Filing Date
EP13197272.1A Withdrawn EP2883662A1 (fr) 2013-12-13 2013-12-13 Porte-outil
EP14809028.5A Withdrawn EP3079859A1 (fr) 2013-12-13 2014-12-09 Porte-outil

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP14809028.5A Withdrawn EP3079859A1 (fr) 2013-12-13 2014-12-09 Porte-outil

Country Status (2)

Country Link
EP (2) EP2883662A1 (fr)
WO (1) WO2015086552A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3107695B1 (fr) * 2014-02-20 2019-11-13 Hilti Aktiengesellschaft Porte-outil

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4702326A (en) * 1984-07-03 1987-10-27 Oy Tampella Ab Coupling arrangement for a drill shank of a percussion drilling machine
US5016892A (en) * 1988-04-01 1991-05-21 Societe De Prospection Et D'inventions Techniques Drill tool holder
JPH0911155A (ja) * 1995-06-23 1997-01-14 Hitachi Koki Co Ltd 衝撃工具の工具保持装置
US6261035B1 (en) * 1998-11-12 2001-07-17 Black & Decker Inc. Chuck, bit, assembly thereof and methods of mounting
DE10061071C1 (de) * 2000-11-20 2002-04-25 Hubert Drohmann Einrichtung zur Einführhilfe für bohrende Werkzeuge sowie Verfahren und Werkzeug zur Herstellung einer Einführhilfe
US7338051B2 (en) 2002-11-14 2008-03-04 Black & Decker Inc. Tool holder for a rotary hammer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4702326A (en) * 1984-07-03 1987-10-27 Oy Tampella Ab Coupling arrangement for a drill shank of a percussion drilling machine
US5016892A (en) * 1988-04-01 1991-05-21 Societe De Prospection Et D'inventions Techniques Drill tool holder
JPH0911155A (ja) * 1995-06-23 1997-01-14 Hitachi Koki Co Ltd 衝撃工具の工具保持装置
US6261035B1 (en) * 1998-11-12 2001-07-17 Black & Decker Inc. Chuck, bit, assembly thereof and methods of mounting
DE10061071C1 (de) * 2000-11-20 2002-04-25 Hubert Drohmann Einrichtung zur Einführhilfe für bohrende Werkzeuge sowie Verfahren und Werkzeug zur Herstellung einer Einführhilfe
US7338051B2 (en) 2002-11-14 2008-03-04 Black & Decker Inc. Tool holder for a rotary hammer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3107695B1 (fr) * 2014-02-20 2019-11-13 Hilti Aktiengesellschaft Porte-outil

Also Published As

Publication number Publication date
EP3079859A1 (fr) 2016-10-19
WO2015086552A1 (fr) 2015-06-18

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