EP3325219A1 - Handwerkzeugmaschine - Google Patents
HandwerkzeugmaschineInfo
- Publication number
- EP3325219A1 EP3325219A1 EP16738743.0A EP16738743A EP3325219A1 EP 3325219 A1 EP3325219 A1 EP 3325219A1 EP 16738743 A EP16738743 A EP 16738743A EP 3325219 A1 EP3325219 A1 EP 3325219A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- exciter
- hand tool
- movement axis
- closure plate
- 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
- B25D17/06—Hammer pistons; Anvils ; Guide-sleeves for pistons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D11/00—Portable percussive tools with electromotor or other motor drive
- B25D11/06—Means for driving the impulse member
- B25D11/062—Means for driving the impulse member comprising a wobbling mechanism, swash plate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D11/00—Portable percussive tools with electromotor or other motor drive
- B25D11/06—Means for driving the impulse member
- B25D11/12—Means for driving the impulse member comprising a crank mechanism
- B25D11/125—Means for driving the impulse member comprising a crank mechanism with a fluid cushion between the crank drive and the striking body
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D16/00—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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
- B25D2211/06—Means for driving the impulse member
- B25D2211/068—Crank-actuated impulse-driving mechanisms
-
- 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
- B25D2217/0011—Details of anvils, guide-sleeves or pistons
- B25D2217/0023—Pistons
-
- 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
- B25D2250/051—Couplings, e.g. special connections between components
-
- 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
Definitions
- the present invention relates to a chiselling or drilling tool hand tool.
- a hammer drill is known from EP 2 857 149.
- the hammer drill has a pneumatic hammer mechanism with a guided in a guide tube excitation piston.
- a closure plate clamps a connecting rod in the exciter piston.
- a portable power tool has a tool holder for holding a tool, an electric motor and a pneumatic impact mechanism.
- the impact mechanism has a guided in a guide tube along a movement axis excitation piston and a coupled via a pneumatic chamber to the exciter piston racket, wherein a piston wall of the exciter piston contacts the guide tube.
- a connecting rod is attached at one end to a piston pin in the exciter piston and coupled to the electric motor at another end.
- a bearing for supporting the piston pin is formed by a piston head of the excitation piston and a closure plate inserted in the exciter piston, the piston crown opposite.
- a rotary closure is formed by a groove extending in a direction of rotation about the movement axis in the piston wall of the excitation piston and a radially projecting wing of the closure plate.
- a pawl for locking the wing against the direction of rotation can be pivoted in the radial direction between a locking position and a releasing position, wherein the pawl is deflected in the releasing position in the radial direction over the outer dimension of the piston wall.
- the closure plate can be inserted into the hollow exciter piston and fastened by the screw cap.
- the pawl prevents unwanted free rotation of the closure plate.
- the pawl itself is inhibited by the guide tube, which must be able to protrude the pawl for the releasing position on the piston wall.
- Fig. 1 a hammer drill
- FIG. 2 shows an excitation piston with a connecting rod in a longitudinal section.
- FIG. 3 shows the excitation piston in a perspective illustration.
- FIG. 4 shows the exciter piston from the rear side.
- FIG. 5 shows a top view of the front side of a closure plate
- Fig. 6 shows a cross section in plane Vl-Vl by the excitation piston and the unlocked closure plate
- Fig. 7 shows a cross section in the plane Vl-Vl by the exciter piston and the locked closure plate
- Fig. 1 shows an example of a chiseling hand tool machine schematically a hammer drill 1.
- the hammer drill 1 has a tool holder 2, in which a shaft end 3 of a tool 4, for example one of the drill, can be used and locked.
- a primary drive of the hammer drill 1 is an electric motor 5, which drives a hammer mechanism 6 and an output shaft 7.
- a battery pack 8 or a power line supplies the electric motor 5 with power.
- a user can lead the hammer drill 1 by means of a handle 9 and take the hammer drill 1 by means of a system switch 10 in operation.
- the hammer drill 1 rotates the drill 4 continuously about a working axis 11 and can beat the drill 4 in the direction of impact 12 along the working axis 11 in a substrate.
- the percussion 6 is a pneumatic percussion 6.
- An exciter piston 13 and a racket 14 are movably guided in a guide tube 15 in the striking mechanism 6 along the working axis 11.
- the excitation piston 13 is coupled via an eccentric 16 or a wobble finger to the electric motor 5 and forced to a periodic, linear movement.
- the excitation piston 13 moves on a predetermined by the guide tube 15 movement axis 17, which preferably coincides with the working axis 11.
- a connecting rod 18 connects the eccentric 16 and the wobble finger with the excitation piston 13.
- the bat 14 can strike directly on a rear end of the drill 4 or indirectly transfer a portion of its pulse to the drill 4 via a substantially quiescent striker 20.
- the striking mechanism 6 and preferably the further drive components are arranged within a machine housing 21.
- a piston wall 22 of the exciter piston 13 is substantially cylindrical and adapted in its diameter 23 to the guide tube 15 so that the piston wall 22 rests against the guide tube 15.
- the piston wall 22 slides on the inner surface of the guide tube 15, whereby the exciter piston 13 is guided parallel to the movement axis 17.
- a piston head 24 of the excitation piston 13 is oriented perpendicular to the movement axis 17.
- a diameter 23 of the piston head 24 or the piston wall 22 substantially corresponds to the inner diameter of the guide tube 15 in order to close off the pneumatic chamber 19 through the piston head 24.
- the excitation piston 13 is connected by the connecting rod 18 to the eccentric 16.
- An axis of rotation 25 of the eccentric 16 is perpendicular to the axis of movement 17 of the hammer mechanism 6.
- the eccentric 16 has, for example, an eccentric finger 26, which in an eye
- the connecting rod 18 has at the other end a piston pin 28.
- the piston pin 28 is mounted within the excitation piston 13 in a bearing 29, which allows pivoting of the connecting rod 18 about an axis of rotation 25 parallel to the pivot axis 30.
- the piston pin 28 is oriented perpendicular to the movement axis 17.
- the piston pin 28 may be rigidly connected to the connecting rod 18, in particular, the piston pin 28 relative to the piston pin
- the connecting rod 18 and the piston pin 28 are preferably a coherent monolithic component, which is made for example of the same plastic.
- the connecting rod 18 and the piston pin 28 may be made, for example, in an injection molding process.
- Monolithic means that the connecting rod 18 and the piston pin 28 are connected inseparably and without joining zone.
- the connecting rod may have a second eye into which the piston pin is inserted.
- the piston pin is in this case rotatable relative to the connecting rod about the pivot axis.
- the bearing 29 for the piston pin 28 is disposed within the excitation piston 13 (Fig. 2).
- the exciter piston 13 is substantially hollow (FIG. 3).
- the piston wall 22 and the piston head 24 enclose a cavity 31 which is open on the rear side 32 facing away from the piston head 24.
- the piston pin 28 and the connecting rod 18 are inserted into the exciter piston 13 via the rear side 32.
- the piston pin 28 abuts against the inside 33 of the piston crown 24.
- the inner side 33 has a first bearing shell 34 (FIG. 4).
- the first bearing shell 34 preferably includes two semi-cylindrical bearing surfaces 35 which face the impact direction 12 opposite.
- the piston pin 28 abuts the first bearing cup 34, i. e.g.
- the piston pin 28 is supported in the direction of impact 12 on the first bearing shell 34.
- the shape of the first bearing shell 34 which partially encompasses the directions of rotation about the movement axis 17, furthermore inhibits a rotation of the piston pin 28 in the two directions of rotation about the movement axis 17.
- the bearing 29 is closed off by a closure plate 36.
- the closure plate 36 includes a second bearing shell 37 which is opposite the first bearing shell 34 along the movement axis 17 (FIG. 5).
- the second bearing shell 37 rests with its bearing surfaces 38 in the direction of impact 12 against the cylindrical sections of the piston pin 28.
- the second bearing surfaces 38 may have a part-cylindrical shape, which lie positively against the piston pin 28.
- the exemplary bearing surfaces 38 correspond to a quarter of a cylinder. However, the bearing surfaces 38 abut on the piston pin 28 only in one direction of rotation about the movement axis 17. In one embodiment, the bearing surfaces 38 may be flat. The bearing surfaces 38 of the closure plate 36 are exposed to low mechanical loads, and may therefore be formed with a smaller contact surface to the piston pin 28.
- the closure plate 36 can be inserted along the movement axis 17 into the cavity 31 of the exciter piston 13.
- the profile of the cavity 31 along the movement axis 17 and the profile of the closure plate 36 along the movement axis 17 are preferably the same in shape and size (FIG. 6).
- the profile is the projection along the movement axis 17 on the plane perpendicular thereto.
- the closure plate 36 slides largely positive fit along the movement axis 17 up to the piston head 24, that is to say adjacent to the first bearing shell 34, into the exciter piston 13.
- the closure plate 36 forms together with the piston wall 22 a rotary closure, which fixes the closure plate 36 along the movement axis 17 in the exciter piston 13.
- the closure plate 36 has a cylindrical body 39 (indicated by the dashed circle) and two vanes 40 radially projecting from the body, which give the closure plate 36 a non-rotationally symmetrical shape.
- the radial direction refers throughout the description to the movement axis 17 or longitudinal axis of the excitation piston 13.
- the two wings 40 define the largest radial dimension 41 of the closure plate 36.
- the exemplary wings 40 are arranged diametrically from the movement axis 17.
- the closure plate 36 may have a different number of wings instead of two.
- the wings 40 may be formed parallel to the piston head 24 or slightly inclined relative to the piston head 24 may be formed.
- the cavity 31 has a cylindrical core 42 (indicated by the dashed circle) and two radially projecting recesses 43 which have a complementary to the wings 40, along the movement axis 17 constant cross-section.
- the piston wall 22 encloses this cavity 31.
- the piston wall 22 has two grooves 44, which extend parallel to the piston head 24 or possibly with the inclination of the wings 40 relative to the piston head 24 (FIG. 7).
- the grooves 44 are opened counter to a direction of rotation 45 in the recesses 43.
- the direction of rotation 45 in the description refers continuously to the movement axis 17 or longitudinal axis of the exciter piston 13.
- the grooves 44 are offset in the direction of rotation 45 to the recesses 43.
- the grooves 44 may have a constant depth or varying depth along the direction of rotation 45. However, the depth is sufficiently sized so that a radial distance of the groove bottom from the movement axis 17 is greater than the radial dimension 41 of the closure plate 36, i. the distance of the wings 40 from the movement axis 17 is.
- the number and arrangement of the grooves 44 about the movement axis 17 corresponds to the arrangement of the wings 40 about the movement axis 17th
- the closure plate 36 is pushed so far into the excitation piston 13 along the movement axis 17 until the wings 40 are at the same height as the grooves 44. Thereafter, the closure plate 36 can be rotated about the movement axis 17, whereby the wings 40 slide into the grooves 44.
- the closure plate 36 is preferably rotatable about the rotation axis 17 by a rotation angle between 45 degrees and 90 degrees, for example at least 60 degrees, for example at most 75 degrees.
- the maximum Angle of rotation is limited by a stop 46, which takes place for example by the closed in the direction of rotation 45 grooves 44 or a stop of the closure plate 36 outside of the grooves 44.
- the closure plate 36 is fixed by the rotary closure along the movement axis 17 in the exciter piston 13.
- the wings 40 are within the grooves 44 on a contact surface 47 against the direction of impact 12 at.
- the effective against the direction of impact 12 tensile forces on the exciter piston 13 are introduced via the contact surface 47.
- the enclosed between the two bearing shells 34, 37 piston pin 28 fixes the connecting rod 18 in the excitation piston 13.
- a pawl 48 is provided in the groove 44. In its locking position, the pawl 48 engages the groove 44 and inhibits rotation of the wings 40 in the groove 44.
- the pawl 48 is deflected radially outwardly by the wing 40 to its releasing position. The wing 40 passes the pawl 48 so far that the pawl 48 can return to the wing 40 back into the locking position.
- the wing 40 is caught in the groove 44 between the stop 46 and the pawl 48.
- the exemplary pawl 48 is suspended on a spring element 49 which drives the pawl 48 in the locking position.
- the exemplary groove 44 has a constant height 50, ie dimension along the movement axis 17.
- the pawl 48 has a lower height than the groove 44.
- the exemplary wing 40 has a flat plate 51 and a bump 52.
- the flat plate 51 may in the Groove 44 slide past the pawl 48 in the direction of rotation 45, since they do not overlap along the movement axis 17.
- the bump 52 abuts the pawl 48. In the locked position of the closure plate 36, the bump 52 between the stopper 46 and the pawl 48 is caught.
- the radial dimensions of the wings 40 and the pawl 48 are dimensioned such that the pawl 48 must be deflected for the releasing position over the circumference of the piston wall 22.
- a radial distance 53 of the pawl 48 from the movement axis is less than the radial dimension 41 of the closure plate 36 in the region of the wing 40.
- the outer radius, ie half the diameter 23 of the piston wall 22 and the inner radius of the guide tube 15, is less than the sum the radial distance of the wing 40 to the movement axis 17 and the radial dimension of the pawl 48.
- the pawl 48 may be formed as part of the piston wall 22.
- the pawl 48 is a protruding into the groove 44 mandrel.
- the piston wall 22 is so far weakened around the mandrel that the piston wall 22 yields when pressing the blade 40 in the radial direction.
- the piston wall 22 is slotted adjacent the pawl 48.
- a longitudinal slot 54 extends parallel to the groove 44 in the direction of impact 12 above and below the pawl 48.
- An opening 55 extends adjacent to the pawl 48 parallel to the movement axis 17 and connects the two longitudinal slots 54.
- the section of the piston wall bordered by the longitudinal slots 54 22 forms in the embodiment as a solid-body joint, the spring element 49, which behaves elastically at the radial deflection in the releasing position of the pawl 48.
- the slots 54 break through the piston wall 22.
- the excitation piston 13 has a circumferential groove 56 on the outside of the piston wall 22.
- a sealing ring 57, the groove 56 is inserted.
- the groove 56 overlaps along the movement axis 17 with the piston pin 28.
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 |
|---|---|---|---|
| EP15177226.6A EP3117962A1 (de) | 2015-07-17 | 2015-07-17 | Handwerkzeugmaschine |
| PCT/EP2016/066501 WO2017012915A1 (de) | 2015-07-17 | 2016-07-12 | Handwerkzeugmaschine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3325219A1 true EP3325219A1 (de) | 2018-05-30 |
| EP3325219B1 EP3325219B1 (de) | 2019-05-15 |
Family
ID=53673819
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP15177226.6A Withdrawn EP3117962A1 (de) | 2015-07-17 | 2015-07-17 | Handwerkzeugmaschine |
| EP16738743.0A Not-in-force EP3325219B1 (de) | 2015-07-17 | 2016-07-12 | Handwerkzeugmaschine |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP15177226.6A Withdrawn EP3117962A1 (de) | 2015-07-17 | 2015-07-17 | Handwerkzeugmaschine |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20180207783A1 (de) |
| EP (2) | EP3117962A1 (de) |
| CN (1) | CN107848098B (de) |
| WO (1) | WO2017012915A1 (de) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3260239A1 (de) * | 2016-06-24 | 2017-12-27 | HILTI Aktiengesellschaft | Handwerkzeugmaschine |
| CN110394769B (zh) * | 2018-04-24 | 2022-03-01 | 博世电动工具(中国)有限公司 | 电动工具 |
| EP3581337A1 (de) * | 2018-06-11 | 2019-12-18 | HILTI Aktiengesellschaft | Handwerkzeugmaschine |
| EP4371709A1 (de) * | 2022-11-15 | 2024-05-22 | Hilti Aktiengesellschaft | Schlagwerk für eine elektrohandwerkzeugmaschine |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5081910A (en) * | 1990-04-10 | 1992-01-21 | Ascenzo Jr Frank D | Locking linear actuator |
| JP3618264B2 (ja) * | 1999-10-18 | 2005-02-09 | Smc株式会社 | エスケープメントシリンダ |
| US6832539B2 (en) * | 2002-07-15 | 2004-12-21 | Delaware Capital Formation, Inc. | Cylinder lock |
| DE102006000252A1 (de) * | 2006-05-30 | 2007-12-06 | Hilti Ag | Handwerkzeugmaschine mit Rutschkupplung |
| DE102007000081A1 (de) * | 2007-02-08 | 2008-08-21 | Hilti Ag | Handwerkzeugmaschine mit pneumatischem Schlagwerk |
| DE102009002474A1 (de) * | 2009-04-20 | 2010-10-21 | Hilti Aktiengesellschaft | Pneumatisches Schlagwerk und Handwerkzeugmaschine |
| DE102009027469A1 (de) * | 2009-07-06 | 2011-01-13 | Robert Bosch Gmbh | Werkzeugvorrichtung |
| DE102010029917A1 (de) * | 2010-06-10 | 2011-12-15 | Hilti Aktiengesellschaft | Werkzeugmaschine |
| DE102011075765A1 (de) * | 2011-05-12 | 2012-11-15 | Hilti Aktiengesellschaft | Handwerkzeugmaschine |
| EP2857149A1 (de) * | 2013-10-03 | 2015-04-08 | HILTI Aktiengesellschaft | Handwerkzeugmaschine |
-
2015
- 2015-07-17 EP EP15177226.6A patent/EP3117962A1/de not_active Withdrawn
-
2016
- 2016-07-12 WO PCT/EP2016/066501 patent/WO2017012915A1/de not_active Ceased
- 2016-07-12 CN CN201680041749.8A patent/CN107848098B/zh active Active
- 2016-07-12 EP EP16738743.0A patent/EP3325219B1/de not_active Not-in-force
- 2016-07-12 US US15/745,415 patent/US20180207783A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| WO2017012915A1 (de) | 2017-01-26 |
| CN107848098B (zh) | 2020-11-10 |
| EP3117962A1 (de) | 2017-01-18 |
| EP3325219B1 (de) | 2019-05-15 |
| US20180207783A1 (en) | 2018-07-26 |
| CN107848098A (zh) | 2018-03-27 |
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