EP1542836A1 - Werkzeugaufnahme - Google Patents
WerkzeugaufnahmeInfo
- Publication number
- EP1542836A1 EP1542836A1 EP03798040A EP03798040A EP1542836A1 EP 1542836 A1 EP1542836 A1 EP 1542836A1 EP 03798040 A EP03798040 A EP 03798040A EP 03798040 A EP03798040 A EP 03798040A EP 1542836 A1 EP1542836 A1 EP 1542836A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- locking
- tool holder
- tool
- axially
- holder according
- 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
Links
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
- B25D2216/00—Details of 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
- B25D2216/0069—Locking means
-
- 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
- B25D2217/0049—Roll-shaped locking members
Definitions
- the invention relates to a tool holder according to the preamble of claim 1, in particular for a hammer drill or a chisel bunting.
- Receiving body with an insertion opening into which a tool shaft can be inserted axially In the inserted state, the tool shank can then be axially locked by locking bodies, the locking bodies engaging in axially extending grooves in the tool shank, so that the tool shank has a certain freedom of movement in the axial direction in the locked state.
- an axially displaceable locking sleeve prevents a radial evasive movement of the locking body when the locking sleeve is in a locking position.
- the locking sleeve is pushed into an unlocking position by the operator tion position is pushed, the locking body can move radially outwards and the drill bit can be removed from the tool holder or inserted into the tool holder.
- the locking sleeve is biased by a spring in the direction of the locking position to prevent unintentional unlocking of the drill bit.
- the locking sleeve can be axially locked in the unlocking position, the locking being carried out, for example, by a leaf spring which engages in the locking sleeve from the inside.
- the invention provides a tool holder in which the mechanism for locking the locking sleeve is simple and robust.
- a locking bolt is mounted in the preferably sleeve-shaped locking element, which can be displaced in the radial direction with respect to the insertion opening between a locking position and a release division.
- the locking element In the locking position of the locking bolt, the locking element is then locked in the unlocking position, so that the tool shaft can be inserted into or removed from the tool holder without the user having to hold the locking element. In the release position of the locking bolt, however, the locking element is not locked in the unlocking position, as a result of which the tool shank is axially locked in the tool holder.
- a spring element which prestresses the locking bolt in the direction of the locking position, the locking bolt in the locking position abutting an axial stop in the receiving body.
- the locking bolt then preferably slides automatically into the locking position due to the spring preload when the user moves the locking element from the locking position into the unlocking position. No user intervention is required to lock the locking element in the unlocking position, which considerably simplifies operation.
- the locking of the locking element can also be released without user intervention in order to further simplify operation.
- the locking bolt can be released from the locking position by the tool shank. This release of the locking is preferably carried out in that the movement of the tool shank is transferred to the locking bolt when it is removed from the tool holder or when it is inserted into the tool holder, thereby releasing the latter from the locking position.
- a preferably spherical Shaped transmission element can be provided, which projects radially into the insertion opening of the tool holder and is displaced radially outwards when the tool shank is inserted or removed and thereby presses the locking bolt radially outwards.
- the transmission element is preferably a ball which is mounted in a radially displaceable manner in an opening in the receiving body.
- the breakthrough tapers conically inwards in order to prevent the ball from falling inwards when there is no tool shank in the tool holder.
- locking element used in the context of the invention is to be understood generally and is not restricted to the locking sleeve described at the outset, which surrounds the receiving body in the form of a jacket and is axially displaceable.
- a spring element is preferably provided, which prestresses the locking element in the direction of the locking position in order to prevent unintentional unlocking of the tool shaft.
- the locking element can be moved, for example, as in the known tool holder described at the outset, in that the user operates the locking element directly.
- Control element provided, preferably as an operating sleeve is executed and the locking element advantageously surrounds a jacket.
- the control element is preferably axially displaceable and biased in the axial direction by a spring element in order to establish a rest position.
- a movement of the operating element can then be transmitted to the locking element, which can be done, for example, by the operating element taking the locking element with it.
- the operating element it is alternatively also possible for the operating element to be coupled rigidly or elastically to the locking element in order to transmit the movement of the operating element to the locking element.
- the actual locking of the tool shank in the tool holder can take place, as in the known tool holder described above, by locking bodies which engage in corresponding grooves in the tool shaft.
- radially displaceable locking rollers are used to lock the tool shank, which are significantly less wear.
- the invention also includes a machine tool, such as a hammer drill or chisel hammer, with a tool holder according to the invention.
- a machine tool such as a hammer drill or chisel hammer
- FIG. 1 shows a cross-sectional view of a tool holder according to the invention in the unlocked position when inserting a tool shank
- FIG. 2 shows a cross-sectional view of the tool holder from FIG. 1 in the locked position with the tool shaft inserted
- FIG. 3 shows a cross-sectional view of the tool holder from FIG. 1 in the unlocked position when removing the Tool shank
- Fig. 4a is a detailed view of the tool holder
- FIG. 4b the detailed view from FIG. 4a in a radial top view
- FIG. 5 an alternative embodiment of a tool holder according to the invention.
- FIGS. 1 to 3 show a tool holder 10 for a hammer drill or chisel hammer, wherein the tool holder 10 enables an axial locking of a tool shank 12 with a predetermined axial range of motion and simple one-hand operation when changing tools.
- the tool holder has an essentially hollow-cylindrical holder body 14 with an insertion opening 16, into which the tool shaft 12 can be inserted axially.
- a plurality of openings are provided in the receiving body 14 distributed over the circumference, in each of which a locking roller 18 is arranged, the openings tapering inwards in the radial direction in order to prevent the locking rollers 18 from falling out inwards.
- the locking rollers 18 can engage for axially locking the tool shaft 12 in an axially extending groove 20 in the lateral surface of the tool shaft 12, whereby the tool shaft 12 is locked with a predetermined axial range of motion.
- the tool holder 10 has a locking sleeve 22 which is axially displaceable between the locking position shown in FIG. 2 and the unlocking position shown in FIG. 1.
- the locking sleeve 22 covers the openings in the receiving body 14 and thus prevents a radial evasive movement of the locking rollers 18, thereby preventing the tool shank 12 from being removed.
- the openings in the receiving body 14 are through covers an elastic sleeve 26 which is attached to the inside of a step-like extension of the locking sleeve 22.
- the locking rollers 18 can then move radially outward, so that the tool shank 12 can be removed from the tool holder 10 or inserted into the tool holder 10.
- the locking sleeve 22 is biased by a spring element 24 in the direction of the locking position to prevent unintentional unlocking of the tool shaft 12.
- the tool holder 10 is operated by an operating sleeve 28 which surrounds the locking sleeve 22 on the outside and is axially displaceable, the operating sleeve 28 being biased in the axial direction by a spring element 30.
- the operating sleeve 28 When the operating sleeve 28 is displaced in the direction of the locking sleeve 22, the operating sleeve 28 abuts the locking sleeve 22, the locking sleeve 22 being taken along axially.
- the tool holder 10 has an elastic, ring-shaped dust collar 32, which prevents dust from penetrating into the insertion opening 16.
- the tool holder 10 has a locking mechanism which locks the locking sleeve 22 in the unlocking position and thereby enables one-hand operation when changing tools.
- the locking mechanism consists, among other things, of a steel ball 34, which is mounted in a radially extending opening 35 in the receiving body 14 so as to be radially displaceable.
- the opening 35 in the uptake body 14 tapers inward in the radial direction in order to prevent the ball 34 from falling out of the opening 35 inwards into the insertion opening 16.
- the ball 34 can therefore only partially protrude inwards into the insertion opening 16, as shown in FIG. 1.
- the locking mechanism has a locking bolt 36 which is mounted in a radially displaceable bore in the locking sleeve 22, the locking bolt 36 being biased radially inwards by an annular spring 38.
- the locking bolt 36 is guided in two axially extending grooves 40, 42, which are arranged in the lateral surface of the receiving body 14 on both sides of the opening 35 for the ball 34, the groove 40 on the workpiece side having a smaller groove depth than the groove 42 on the tool side In the unlocking position shown in FIG. 1, the locking bolt 36 therefore lies axially against the step between the two grooves 40, 42, as a result of which the locking sleeve 22 is axially locked.
- the locking sleeve 22 Before the tool shank 12 is inserted, the locking sleeve 22 must first be brought into the unlocking position shown in FIG. 1. For this purpose, the user pushes the operating sleeve 28 in the direction of the locking sleeve 22, the locking sleeve 22 being axially entrained until the locking bolt 36 finally engages behind the step between the two grooves 40, 42 and thereby axially locks the locking sleeve 22.
- the user can then release the control sleeve 28, which then returns to its starting position due to the pretension of the spring 30.
- the tool shaft 12 When the tool shaft 12 is inserted axially into the insertion opening 16, the tool shaft 12 then presses the locking rollers 18 radially outward until the locking rollers 18 then engage in the grooves 20 in the tool shaft 12.
- the tool shank 12 is thus automatically locked when it is inserted into the tool holder 10 without any user intervention being necessary.
- the locking sleeve 22 Before the tool shank 12 is removed from the tool holder 10, the locking sleeve 22 must first be moved from the locking position shown in FIG. 2 to the unlocking position shown in FIG. 3. For this purpose, the user pushes the operating sleeve 28 axially from the position shown in FIG. 1 in the direction of the locking sleeve 22, the operating sleeve 28 taking the locking sleeve 22 axially until the locking bolt 36 lies behind the ball 34 in the groove 42 on the tool side and thereby engages the ball 34 abuts.
- the locking sleeve 22 is then axially locked by the ball 34 and the locking bolt 36, since the locking bolt 36 lies laterally on the ball 34, while the ball 34 is pressed outwards by the outer surface of the tool shank 12.
- the groove 20 for the locking rollers 18 in the circumferential direction does not include the part in which the ball 34 is arranged. The ball 34 can therefore not move inwards into the groove 20, since this is arranged at an angle to the ball 34.
- the user can then pull the tool shank 12 axially out of the tool holder 10 until the tool shank 12 finally releases the ball 34, which then deflects radially inwards.
- the locking bolt 36 is then no longer blocked by the ball 34, so that the locking sleeve 22 moves into the locking position shown in FIG. 2 due to the pretension of the spring 24.
- FIG. 5 The exemplary embodiment of a tool holder 10 'according to the invention shown in FIG. 5 largely corresponds to the tool holder 10 described above, so that in the following reference is made to avoid repetition of the above description and the same reference numerals are used for corresponding components, which are only used to distinguish them are marked by an apostrophe.
- the peculiarity of this exemplary embodiment is that the spring 30 provided in FIGS. 1 to 3 for resetting the operating sleeve 28 is dispensed with.
- the operating sleeve 28 'in this embodiment is firmly connected to the locking sleeve 22', so that both are moved together.
- the invention is not restricted to the preferred exemplary embodiments described above. Rather, a large number of variants and modifications are possible which likewise make use of the idea according to the invention and therefore fall within the scope of protection.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Percussive Tools And Related Accessories (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10243289 | 2002-09-18 | ||
DE2002143289 DE10243289A1 (de) | 2002-09-18 | 2002-09-18 | Werkzeugaufnahme |
PCT/DE2003/001851 WO2004028752A1 (de) | 2002-09-18 | 2003-06-04 | Werkzeugaufnahme |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1542836A1 true EP1542836A1 (de) | 2005-06-22 |
EP1542836B1 EP1542836B1 (de) | 2008-05-07 |
Family
ID=32038158
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03798040A Expired - Lifetime EP1542836B1 (de) | 2002-09-18 | 2003-06-04 | Werkzeugaufnahme |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1542836B1 (de) |
JP (1) | JP2005538859A (de) |
CN (1) | CN1681625A (de) |
DE (2) | DE10243289A1 (de) |
WO (1) | WO2004028752A1 (de) |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3421811C2 (de) * | 1984-06-12 | 1995-11-16 | Hilti Ag | Werkzeughalter für Bohr- und Meisselgeräte |
DE3638215A1 (de) * | 1986-11-08 | 1988-05-11 | Hilti Ag | Werkzeughalter mit anschlagelement |
DE3773471D1 (de) * | 1986-12-17 | 1991-11-07 | Hilti Ag | Handgeraet. |
-
2002
- 2002-09-18 DE DE2002143289 patent/DE10243289A1/de not_active Ceased
-
2003
- 2003-06-04 JP JP2004538677A patent/JP2005538859A/ja active Pending
- 2003-06-04 EP EP03798040A patent/EP1542836B1/de not_active Expired - Lifetime
- 2003-06-04 CN CN 03822201 patent/CN1681625A/zh active Pending
- 2003-06-04 WO PCT/DE2003/001851 patent/WO2004028752A1/de active IP Right Grant
- 2003-06-04 DE DE50309802T patent/DE50309802D1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO2004028752A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE10243289A1 (de) | 2004-05-19 |
WO2004028752A1 (de) | 2004-04-08 |
EP1542836B1 (de) | 2008-05-07 |
CN1681625A (zh) | 2005-10-12 |
DE50309802D1 (de) | 2008-06-19 |
JP2005538859A (ja) | 2005-12-22 |
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