EP3826811A1 - Werkzeugaufnahme und handwerkzeugmaschine - Google Patents
Werkzeugaufnahme und handwerkzeugmaschineInfo
- Publication number
- EP3826811A1 EP3826811A1 EP19737547.0A EP19737547A EP3826811A1 EP 3826811 A1 EP3826811 A1 EP 3826811A1 EP 19737547 A EP19737547 A EP 19737547A EP 3826811 A1 EP3826811 A1 EP 3826811A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tool
- locking
- tool holder
- eccentric
- locking element
- 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
-
- 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
- B25D17/082—Retainers consisting of a swinging yoke or latching means
-
- 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
- B25D2250/231—Sleeve details
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T279/00—Chucks or sockets
- Y10T279/17—Socket type
- Y10T279/17042—Lost motion
- Y10T279/17068—Rotary socket
Definitions
- the present invention relates to a tool holder for a hand tool and a hand tool with such a tool holder.
- a demolition hammer or chisel hammer comprises a tool holder in which a tool, such as a chisel, can be received.
- a tool holder can have a locking device for locking the tool in the tool holder in the form of a folding mechanism.
- a folding mechanism comprises a locking element which can be folded perpendicular to a central axis of the tool in order to lock the tool in the tool holder and to release it again.
- Such a folding mechanism is mostly stiff when new and after some operating time of the hand-held power tool is often so worn that it opens by itself and the tool can fall out of the tool holder.
- An object of the present invention is to provide an improved tool holder for a hand machine tool.
- the tool holder for a handheld power tool, in particular for a demolition hammer or chisel hammer, is proposed.
- the tool holder comprises a receiving element for receiving a tool, and a locking element, which is mounted eccentrically and rotatably on the receiving element, for locking the tool in the tool holder, the locking element being rotated around the receiving element from an unlocked state in which the tool emerges from the receiving element can be removed, in a locking state in which the locking element engages around the tool in a form-fitting manner, and vice versa.
- the eccentric pivoting of the locking element around the receiving element means that there is no need for a hinged folding mechanism as mentioned above. This increases the operational reliability of the tool holder.
- the receiving element preferably comprises a receiving section for receiving the tool.
- the receiving section can have, for example, a hexagonal inner geometry, the tool correspondingly having a hexagonal outer geometry.
- the tool holder is preferably mounted on the handheld power tool such that the tool holder can perform a linear movement.
- the handheld power tool can comprise a striking mechanism for linear movement of the tool holder.
- the striking mechanism can be driven, for example, with the aid of an electric motor.
- the tool can comprise a, in particular circumferential, locking collar, which the locking element engages or engages behind in a form-fitting manner in the locked state.
- the unlocked state can also be referred to as the unlocked position
- the locked state can also be referred to as the locked position.
- a positive connection is understood to mean a connection in which two connection partners, in the present case the locking element and the tool, engage or engage behind one another. In the unlocked state, this positive connection is released so that the tool can be pulled out of the receiving element. In the locked state, it is not possible to remove the tool from the receiving element, since the locking element surrounds or engages behind the tool in a form-fitting manner.
- the locking element can also be referred to as a locking sleeve or is a locking sleeve.
- the locking element engages both in the unlocked state and in the locked state.
- a locking device can be provided.
- the latching device can comprise, for example, a spring-loaded ball or a spring-loaded bolt.
- the locking element can be spring-biased both in the direction of the unlocked state and in the direction of the locked state, so that no intermediate position of the locking element is possible between the unlocked state and the locked state. This simplifies the handling of the tool holder.
- the tool holder comprises a central axis assigned to the receiving element and an eccentric axis assigned to the locking element, about which the locking element is rotatably mounted, the eccentric axis being arranged parallel to and spaced from the central axis.
- the receiving element is preferably constructed to be rotationally symmetrical to the central axis.
- the eccentric axis is arranged eccentrically to the central axis.
- eccentric with respect to the axes is to be understood to mean that the eccentric axis is arranged parallel to and spaced from the central axis. This means that the eccentric axis does not match the central axis.
- the locking element can be moved from the unlocked state into the locked state and vice versa by rotating the same about the eccentric axis.
- the locking element is mounted, in particular, off-center on or around the receiving element with respect to the central axis of the receiving element.
- the locking element can be rotatably mounted directly on the receiving element.
- the locking element can be rotatably mounted directly on the receiving element.
- the locking element can be rotatably mounted indirectly on the receiving element.
- a further element or component can be provided between the receiving element and the locking element, on which the locking element is rotatably mounted.
- the tool holder comprises an eccentric element which is arranged between the holder element and the locking element.
- the eccentric element is optional.
- the eccentric element and the receiving element can be two separate components.
- the eccentric element can also be formed in one piece with the receiving element or in one piece with the locking element his.
- the locking element is rotatably mounted on the eccentric element.
- a plain bearing or a roller bearing can be provided.
- the eccentric element has a cylindrical inner geometry in which the receiving element is received and which is constructed rotationally symmetrically to the central axis, and a cylindrical outer geometry which is arranged eccentrically to the inner geometry and which is received in the locking element and which is rotationally symmetrical to the eccentric axis is.
- the aforementioned central axis is in particular the central axis of the receiving element.
- the aforementioned eccentric axis is in particular the eccentric axis of the locking element.
- the eccentric axis can also be assigned to the eccentric element.
- the cylindrical inner geometry of the eccentric element can be a cylindrical inner surface of a recess or bore breaking through the eccentric element.
- the eccentric element is preferably cylindrical and comprises two end faces spaced apart and parallel to one another.
- the cylindrical outer geometry of the eccentric element can be a cylindrical outer surface of the same.
- the locking element can be rotatably mounted on the cylindrical outer geometry of the eccentric element.
- the fact that the inner geometry and the outer geometry of the eccentric element are arranged eccentrically to one another means that they do not have a common central axis.
- the outer geometry can also be provided on the receiving element. In this case the eccentric element is optional.
- the receiving element has a cylindrical outer geometry which is received in the inner geometry of the eccentric element and which is constructed rotationally symmetrically to the central axis.
- the cylindrical outer geometry of the receiving element can be a cylindrical outer surface of the same.
- the outer geometry of the receiving element preferably bears against the inner geometry of the eccentric element.
- the eccentric element is rotatably fixed with respect to the receiving element, the locking element being rotatable with respect to the eccentric element.
- the eccentric element is firmly connected to the receiving element, in particular screwed.
- the locking element can be rotatably mounted on the eccentric element.
- a bearing device such as a slide bearing or a roller bearing, can be provided.
- the locking element has a cylindrical inner geometry, in which the eccentric element is accommodated, and a cylindrical outer geometry, which is arranged eccentrically to the inner geometry.
- the cylindrical inner geometry is preferably a cylindrical inner surface of the locking element.
- the inner geometry of the locking element can bear against the outer geometry of the eccentric element.
- the cylindrical outer geometry of the locking element can be a cylindrical outer surface thereof.
- the inner geometry of the locking element is rotationally symmetrical to a first central axis of the locking element, and the outer geometry of the locking element is rotationally symmetrical to a second central axis of the locking element.
- the two central axes are arranged parallel to one another and spaced apart from one another. This means that the central axis of the inner geometry and the central axis of the outer geometry are positioned eccentrically to one another.
- the locking element has a holding collar which engages around the tool in a form-fitting manner in the locked state.
- the tool preferably comprises a circumferential locking collar.
- the holding collar is set up to engage behind or encompass the locking collar in such a way that the tool cannot be pulled out of the receiving element in the locked state.
- the holding collar extends out of an end face of the locking element.
- the locking element preferably comprises two end faces arranged parallel to one another and spaced apart from one another.
- the holding collar extends out of one of the two end faces.
- the holding collar has a holding section arranged parallel to the end face and having a recess, the Holding section in the locked state engages around the tool in a form-fitting manner and the tool is guided through the recess in the locked state.
- the holding collar preferably comprises a partially cylindrical base section which extends out of the end face and which is connected in one piece to the holding section with the aid of a connecting section which is curved in particular in the form of a spherical cap.
- the holding section at least partially closes off the locking element on the front or front side.
- the recess is preferably curved, in particular a circular arc.
- the locking element has a tubular geometry with a variable wall thickness.
- the wall thickness is preferably greater in the area of the holding collar than in an area in which the holding collar is not provided. As a result, a smaller wall thickness can be provided in areas of the locking element that are not mechanically stressed. In this way, a significant weight saving can be achieved compared to a constant wall thickness.
- a handheld power tool with such a tool holder is also proposed.
- the hand tool is preferably a demolition hammer or chisel hammer.
- the handheld power tool preferably comprises a drive, in particular an electric motor, which is set up to linearly move the tool holder back and forth in order to actuate the tool.
- the tool can be a chisel, for example.
- the hand-held power tool comprises a tool received in the receiving element, which has a locking collar which the locking element engages in a form-fitting manner in the locking state in order to lock the tool in the tool holder.
- the locking collar preferably runs completely around the tool. Alternatively, the locking collar can only partially run around the tool.
- the tool has an enlarged diameter in the region of the locking collar.
- the Locking collar can be ring-shaped.
- the locking collar can also be polygonal, in particular hexagonal.
- Fig. 1 is a schematic view of an embodiment of a
- Fig. 2 is a schematic perspective view of an embodiment of a
- FIG. 3 shows a schematic top view of the tool holder according to FIG. 2;
- FIG. 4 shows a schematic side view of the tool holder according to FIG. 2;
- FIG. 5 shows a further schematic side view of the tool holder according to FIG. 2;
- FIG. 6 shows a further schematic perspective view of the tool holder according to FIG. 2;
- FIG. 7 shows a further schematic top view of the tool holder according to FIG. 2;
- FIG. 8 shows a further schematic side view of the tool holder according to FIG. 2;
- FIG. 9 shows a further schematic side view of the tool holder according to FIG. 2;
- Fig. 10 is a schematic perspective view of an embodiment of a
- Fig. 1 1 is a schematic plan view of the locking element according to FIG. 10;
- FIG. 12 shows a schematic side view of the locking element according to FIG. 10; 13 is a schematic sectional view of the locking element according to the section line Xlll-Xlll of FIG. 12; and
- FIG. 14 shows a further schematic sectional view of the locking element according to FIG.
- the handheld power tool 1 shows a schematic view of an embodiment of a handheld power tool 1.
- the handheld power tool 1 is in particular a demolition hammer or chisel hammer.
- the handheld power tool 1 comprises a machine body 2, on the left and right of which a handle 3, 4 is provided in the orientation of FIG. 1.
- the handles 3, 4 are mounted on the machine body 2 in a vibration-decoupled manner.
- the machine body 2 comprises a plurality of housings 5 to 7.
- a drive of the hand power tool 1 can be accommodated in a first housing 5.
- a second housing 6 arranged on the underside of the first housing 5 in the orientation of FIG. 1 can be suitable for receiving an impact mechanism of the handheld power tool 1.
- a third housing 7 is provided on the underside of the second housing 6.
- the third housing 7 can for example be screwed to the second housing 6.
- a tool holder 8 can be mounted in a linearly movable manner in or on the third housing 7. When the handheld power tool 1 is in operation, the tool holder 8 moves up and down in a vertical direction V.
- the vertical direction V can be oriented from top to bottom in the orientation of FIG. 1.
- the vertical direction V can coincide with a direction of gravity.
- a tool 9 is received in the tool holder 8.
- the tool 9 can be a chisel, for example.
- the tool 9 can be hexagonal in cross section.
- the tool 9 comprises a locking collar 10 running around the same, the function of which will be explained below.
- the locking collar 10 can be hexagonal in cross section.
- the locking collar 10 can, however, also be circular. 8 and 9, the locking collar is provided with the reference number 10 at an operating point of the tool 9, and the locking collar is provided with the reference number 10 'in an empty position of the tool 9.
- the tool holder 8 comprises a receiving element 11 for receiving the tool 9.
- the receiving element 11 is rotationally symmetrical with respect to a symmetry or center axis M1 1.
- the receiving element 11 comprises a cylindrical or cylindrical outer geometry 12 constructed rotationally symmetrically with respect to the central axis M1 1.
- the outer geometry 12 can, for example, be a cylindrical outer surface of the receiving element 11.
- the receiving element 1 1 is slidably mounted in the housing 7 along the vertical direction V.
- the receiving element 11 comprises a receiving area for receiving the tool 9.
- the receiving area can be designed, for example, as a hexagon socket into which the tool 9 is inserted.
- the receiving element 1 1 is received in an eccentric element 13.
- the eccentric element 13 is preferably connected to the receiving element 11 in a rotationally fixed manner. That is, the eccentric element 13 cannot rotate with respect to the receiving element 11.
- the eccentric element 13 can be formed in one piece with the receiving element 11. That is, the receiving element 11 and the eccentric element 13 can form a common, in particular one-piece, component.
- the eccentric element 13 has a circular cylindrical shape with a cylindrical or cylindrical inner geometry 14 in which the receiving element 11 is received.
- the inner geometry 14 can be, for example, a cylindrical inner surface of the eccentric element 13.
- the inner geometry 14 is an opening which breaks through the eccentric element 13 over its entire length.
- the outer geometry 12 of the receiving element 11 bears against the inner geometry 14 of the eccentric element 13.
- the inner geometry 14 is constructed rotationally symmetrical to the central axis M1 1.
- the eccentric element 13 comprises a cylindrical or cylindrical outer geometry 15, which is constructed rotationally symmetrically to an eccentric axis E.
- the eccentric axis E is constructed eccentrically to the central axis M1 1.
- “eccentric” is to be understood to mean that the eccentric axis E is arranged parallel to and at a distance from the central axis M1 1.
- the eccentric element 13 furthermore comprises two end faces 16 arranged parallel to one another and spaced apart from one another, which are oriented both perpendicularly to the inner geometry 14 and to the outer geometry 15.
- the tool holder 8 further comprises a locking element 17 shown in FIGS. 2 to 14.
- the locking element 17 is sleeve-shaped and can therefore also be referred to as a locking sleeve.
- the locking element 17 comprises a cylindrical or cylindrical inner geometry 18 in which the eccentric element 13 is received.
- the inner geometry 18 is a cylindrical inner surface of the locking element 17.
- the inner geometry 18 of the locking element 17 can be rotatably mounted on the outer geometry 15 of the eccentric element 13.
- the inner geometry 18 is rotationally symmetrical with respect to a symmetry or center axis M18 (FIGS. 11 to 14) of the locking element 17.
- the central axis M18 can coincide with the eccentric axis E.
- the locking element 17 furthermore comprises a cylindrical or cylindrical outer geometry 19 arranged eccentrically to the inner geometry 18.
- the outer geometry 19 is, for example, a cylindrical outer surface of the locking element 17.
- the outer geometry 19 is rotationally symmetrical with respect to a symmetry or center axis M19 (FIGS. 1 1 to 14) of the locking element 17 is formed.
- the central axes M18, M19 are arranged eccentrically. That is, the central axis M19 is positioned parallel to the central axis M18 and at a distance from it. This means in particular that the central axis M19 does not coincide with the central axis M18.
- the locking element 17 has a constant wall thickness W instead of a constant one. In this way, significant weight savings can be achieved compared to a constant wall thickness.
- the locking element 17 furthermore comprises a fastening shoulder 20 which extends radially to the central axes M18, M19 and extends out of the inner geometry 18.
- the fastening shoulder 20 can, for example, engage in the eccentric element 13 in such a way that the locking element 17 is fastened to the eccentric element 13 so that it cannot be rotated is.
- the locking element 17 further comprises two end faces 21, 22 arranged parallel to one another and spaced apart from one another.
- the end faces 21, 22 are oriented perpendicular to the central axes M18, M19.
- Extending out of the end face 22 is a holding collar 23 which is set up to positively engage around the locking collar 10 of the tool 9.
- a positive connection is created by the or reaching behind of at least two connection partners, in the present case the holding collar 23 and the locking collar 10.
- the holding collar 23 comprises a part-cylindrical base section 24 which extends out of the end face 22.
- “part-cylindrical” is to be understood to mean that the base section 24 is formed with the aid of part of a cylinder, in particular part of a hollow cylinder.
- the base section 24 is not closed circumferentially, but open.
- the base section 24 is partially closed at the front or the front by a holding section 25.
- a spherical, in particular spherical cap, curved connecting section 26 can be provided between the base section 24 and the holding section 25.
- An opening or window 27 is also provided in the base section 24.
- the holding section 25 further comprises an arcuate recess 28 through which the tool 9 is passed.
- the recess 28 can be constructed rotationally symmetrical to the central axis M18.
- the functionality of the tool holder 8 is explained below with reference to FIGS. 2 to 9. 2 to 5, in which the tool 9 can be pulled out of the receiving element 11 in the vertical direction V and in which the holding collar 23 does not engage or engage behind the locking collar 10 in one 6 to 9, shown in the locking state Z2, in which the locking element 17 positively engages around the tool 9 and in particular the locking collar 10, and vice versa.
- the locking element 17 is rotated around the receiving element 11 and in particular around the eccentric element 13, as indicated in FIG. 6 with the aid of a double arrow 29.
- the locking element 17 is rotated about the eccentric axis E.
- the holding collar 23 pivots when the locking element 17 is moved from the unlocked state Z1 (FIG. 3) to the locked state Z2 (FIG. 7) via the locking collar 10 of the tool 9 in such a way that the tool 9 has a positive fit the receiving element 11 is locked.
- the retaining collar 23 thus engages or engages behind the locking collar 10 in a form-fitting manner. Pulling the tool 9 out of the tool holder 8 in the vertical direction V is therefore not possible in the locked state Z2.
- the holding collar 23 pivots away from the tool 9 such that it can be pulled out of the receiving element 11 in the vertical direction V without the holding collar 23 in contact with the locking collar 10 devices.
- the retaining collar 23 is arranged in the unlocked state Z1 in such a way that the locking collar 10 can be led out through the recess 28 of the retaining collar 23.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Percussive Tools And Related Accessories (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP18184891.2A EP3599058A1 (de) | 2018-07-23 | 2018-07-23 | Werkzeugaufnahme und handwerkzeugmaschine |
| PCT/EP2019/068824 WO2020020667A1 (de) | 2018-07-23 | 2019-07-12 | Werkzeugaufnahme und handwerkzeugmaschine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3826811A1 true EP3826811A1 (de) | 2021-06-02 |
| EP3826811B1 EP3826811B1 (de) | 2024-09-18 |
Family
ID=63035885
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP18184891.2A Withdrawn EP3599058A1 (de) | 2018-07-23 | 2018-07-23 | Werkzeugaufnahme und handwerkzeugmaschine |
| EP19737547.0A Active EP3826811B1 (de) | 2018-07-23 | 2019-07-12 | Werkzeugaufnahme und handwerkzeugmaschine |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP18184891.2A Withdrawn EP3599058A1 (de) | 2018-07-23 | 2018-07-23 | Werkzeugaufnahme und handwerkzeugmaschine |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US12083662B2 (de) |
| EP (2) | EP3599058A1 (de) |
| CN (1) | CN112334277B (de) |
| WO (1) | WO2020020667A1 (de) |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2278931A (en) * | 1940-10-11 | 1942-04-07 | Chicago Pneumatic Tool Co | Double lock chuck for rock drills |
| DE838734C (de) * | 1950-09-12 | 1952-05-15 | Rudolf Hausherr & Soehne Masch | Abbauhammer od. dgl. |
| DE2432105A1 (de) * | 1974-07-04 | 1976-01-22 | Duss Maschf | Schlag- oder drehschlaghammer |
| US4106573A (en) * | 1976-09-13 | 1978-08-15 | Joy Manufacturing Company | Drill |
| US4206820A (en) * | 1976-09-13 | 1980-06-10 | Joy Manufacturing Company | Striking bar |
| DE3029560A1 (de) * | 1980-08-05 | 1982-03-11 | Friedrich Duss Maschinenfabrik GmbH & Co, 7265 Neubulach | Werkzeughalterung an einem schlag- oder drehschlaghammer |
| JPS6029432Y2 (ja) * | 1981-11-30 | 1985-09-05 | リョービ株式会社 | ハンマ−ドリル等の工具脱着装置 |
| CA2339430A1 (en) | 2000-03-10 | 2001-09-10 | Black & Decker Inc. | Hammer |
| DE102011004985A1 (de) | 2011-03-02 | 2012-09-06 | Hilti Aktiengesellschaft | Werkzeugaufnahme |
| DE102011075858A1 (de) * | 2011-05-16 | 2012-11-22 | Robert Bosch Gmbh | Werkzeugaufnahme |
| DE102011075860A1 (de) * | 2011-05-16 | 2012-11-22 | Robert Bosch Gmbh | Werkzeugaufnahme |
| DE102013213814A1 (de) * | 2012-11-15 | 2014-05-15 | Robert Bosch Gmbh | Werkzeugvorsatz für eine Handwerkzeugmaschine |
| US10011008B2 (en) | 2012-11-15 | 2018-07-03 | Robert Bosch Gmbh | Tool attachment for a hand-held machine tool |
| DE102012222639A1 (de) * | 2012-12-10 | 2014-06-12 | Robert Bosch Gmbh | Handwerkzeugmaschinenschlagwerkvorrichtung |
-
2018
- 2018-07-23 EP EP18184891.2A patent/EP3599058A1/de not_active Withdrawn
-
2019
- 2019-07-12 US US17/256,684 patent/US12083662B2/en active Active
- 2019-07-12 WO PCT/EP2019/068824 patent/WO2020020667A1/de not_active Ceased
- 2019-07-12 CN CN201980041899.2A patent/CN112334277B/zh active Active
- 2019-07-12 EP EP19737547.0A patent/EP3826811B1/de active Active
Also Published As
| Publication number | Publication date |
|---|---|
| EP3599058A1 (de) | 2020-01-29 |
| WO2020020667A1 (de) | 2020-01-30 |
| EP3826811B1 (de) | 2024-09-18 |
| US20210362316A1 (en) | 2021-11-25 |
| US12083662B2 (en) | 2024-09-10 |
| CN112334277A (zh) | 2021-02-05 |
| CN112334277B (zh) | 2024-10-29 |
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