EP2366495B1 - Machine-outil manuelle dotée d'un engrenage excentrique et d'un verrou - Google Patents

Machine-outil manuelle dotée d'un engrenage excentrique et d'un verrou Download PDF

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Publication number
EP2366495B1
EP2366495B1 EP20110001855 EP11001855A EP2366495B1 EP 2366495 B1 EP2366495 B1 EP 2366495B1 EP 20110001855 EP20110001855 EP 20110001855 EP 11001855 A EP11001855 A EP 11001855A EP 2366495 B1 EP2366495 B1 EP 2366495B1
Authority
EP
European Patent Office
Prior art keywords
eccentric
tool
gear
rotation
hand
Prior art date
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Active
Application number
EP20110001855
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German (de)
English (en)
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EP2366495A1 (fr
Inventor
Hans-Peter Albrecht
Stefan Tulodziecki
Nina Rauscher
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.)
Festool GmbH
Original Assignee
Festool Group and Co KG
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Publication date
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Publication of EP2366495A1 publication Critical patent/EP2366495A1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B24B23/03—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor the tool being driven in a combined movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/04—Portable grinding machines, e.g. hand-guided; Accessories therefor with oscillating grinding tools; Accessories therefor

Definitions

  • the invention relates to a hand-held machine tool, in particular a grinding machine and / or a polishing machine, according to the preamble of claim 1.
  • Such a hand-held machine tool in the form of an eccentric sander starts EP 0 525 328 A1 out. Due to the bearing friction of the tool shaft bearing, the tool shaft comes into rotation about the drive axle, but can be braked. There are proposed as an additional device rotation angle guide means which act directly on the sanding pad to hold this in a predetermined rotation angle sector. At the tool holder of the known eccentric grinder tools with polygonal outer contour, for example, triangular sanding plates can be attached. There is a risk that they start to rotate in the rotation eccentric mode about the drive axle, which leads to danger to the operator.
  • the blocking contour goes through e.g. in a tool assembly a mounting path.
  • the locking contour assumes, for example in the mounted position, an end position.
  • a basic idea of the invention is that the eccentric gear directly from the Exzentermodus only in the rotation eccentric mode, For example, a forced rotation eccentric mode or a free-rotation eccentric mode can be switched, but only if there is no tool on the tool holder or one that is suitable for a rotation eccentric mode, such as a round pad or even another, a at least substantially round outer contour exhibiting tool.
  • a forced rotation eccentric mode or a free-rotation eccentric mode can be switched, but only if there is no tool on the tool holder or one that is suitable for a rotation eccentric mode, such as a round pad or even another, a at least substantially round outer contour exhibiting tool.
  • Another inventive approach is that such a tool can only be mounted on the tool holder when the tool holder is stable in rotation angle, ie that it is within the predetermined, limited by the rotation angle guide means rotational angle sector and remains there.
  • the locking body is in the first position towards the tool holder, i. advanced in the assembly path of the locking contour or the end position or stands there.
  • the blocking body In the second position, the blocking body is moved away from the end position or the mounting path of the locking contour of the tool.
  • the blocking body by means of the switching means or other, for example, manual adjustment, in the first or second position is adjustable.
  • the blocking body is spring-loaded in the first or second position.
  • the switching means expediently have an actuator acting on a transmission component of the eccentric drive for switching between the eccentric only mode and the rotary eccentric mode, for example the forced rotation eccentric mode and / or the free rotation eccentric mode.
  • the locking body can now be firmly connected to the actuator of the switching means or form a part of the actuator.
  • an adjusting gear is arranged between the locking body and the actuating member, for example, a sliding gear, a bevel gear or a deflection gear. It is understood that even gears, belt or cable transmission or the like other gearboxes are possible.
  • an inclined surface gear which comprises a locking body arranged on the blocking body oblique surface and arranged on the actuating member actuator oblique surface. It is understood that even a single bevel could be sufficient.
  • the actuator is expediently rotatable, while the locking body is mounted linearly. In a rotational adjustment of the actuator expediently causes a linear adjustment of the locking body.
  • the locking body When the locking body is in the first position and abuts against the locking contour, it expediently forms a stop for the actuating member such that an adjustment from the eccentric-only mode in the rotation eccentric mode is not possible.
  • a blocking body guide for guiding the locking body with respect to the machine housing between the first and second position is expediently designed as a linear guide. It is understood that the locking body could also be mounted rotatably or rotatably and slide-movable.
  • the eccentric gear expediently has a transmission housing.
  • various of the following measures can be taken in the blocking body.
  • the blocking body has a contour adapted to the transmission housing.
  • it is particularly space-saving accommodate.
  • the transmission housing can provide a stop surface on which the locking body abuts in the first position or the second position.
  • the blocking body is arranged outside of the transmission housing.
  • the gear housing contour it is understood that alternatively, an arrangement of the locking body in the gear housing, at least partially, is possible.
  • the blocking body expediently projects in front of the machine housing.
  • the rotation eccentric mode comprises, as it were, two rotation eccentric modes, namely a free rotation eccentric mode, in which the tool shaft performs its rotational movements due to the bearing friction of the tool shaft bearing, and a forced rotation eccentric mode, in which the rotation of the tool shaft is, so to speak, predetermined.
  • the forced rotation guide ensures then for a forced rotation of the tool holder to the drive axle.
  • the switching means are accordingly advantageously designed to to switch the eccentric gear between the free rotation eccentric mode and the forced rotation eccentric mode.
  • the forced rotation guide expediently has a rolling body which is rotationally fixed relative to the tool shaft and a rolling base which is rotationally fixed with respect to the machine housing or the gear housing and at which the rolling body rolls in the forced rotation eccentric mode.
  • the rolling element and the rolling base are formed for example by a planetary gear and a ring gear (or vice versa).
  • a maloperation of the hand-held machine tool prevents it when a rotation angle coding for cooperation with Jacobkodtechnik the tool is arranged on the tool holder, wherein the rotation angle coding and the Gegenkodtechnik fit only in a single angular position of the tool relative to the tool holder to each other.
  • the tool can be mounted only in a single angular position on the tool holder, wherein this rotational angle position is in turn held by the rotational angle guide means within the limited rotational angle sector.
  • a tool for the eccentric only mode conveniently has a polygonal, e.g. square or triangular, Au- ⁇ enkontur.
  • the rotation angle sector is limited to a single angle of rotation or a narrow angle range of, for example, 1 to 5 °, so that the tool does not or only slightly oscillates back and forth on the tool holder.
  • the rotation angle guide means hold the tool holder rotationally stable, thus the eccentric only mode is set, the tool holder with respect to the drive axle rotation.
  • the rotation angle guide means thus fulfill the function of a spindle stop.
  • the rotation angle guide means can thus be advantageously brought into action when the tool is to be removed from the tool holder or arranged at this, so a tool change takes place.
  • a rotational actuation of the tool relative to the tool holder readily possible because the rotation angle guide means hold the tool holder rotation.
  • the Wälzköper the forced rotation guide forms a part of the rotation angle guide means.
  • a guide contour in particular a linear guide contour, can be arranged directly on the rolling element, in particular its end face.
  • the drawing shows a hand machine tool 10, which in the present case is designed as a grinding machine or polishing machine, depending on which tool is used.
  • the hand machine tool 10 can be operated in an eccentric mode.
  • a machine housing 11 of the hand-held machine tool 10 comprises a tool area 12 and a motor area 13, which are connected to one another by a handle 14 and a connecting section 15.
  • the machine housing 11 is formed, for example, by two shell-like side parts 16a, 16b, which delimit a receiving space for components to be protected of the hand-held machine tool 10.
  • the motor portion 13 and the tool portion 12 as well as the handle 14 and the connecting portion 15 have a substantially cylindrical shape, wherein the end faces of the cylinder defined by the handle 14 and the connecting portion 15 on the peripheral sides defined by the tool portion 12 and the motor portion 13 Adjacent cylinder.
  • a drive motor 17 is housed, in this case an electric motor, wherein pneumatic motors or other drive principles are also conceivable.
  • the drive motor 17 is supplied with electrical energy via an electrical connection 18.
  • the hand-held power tool 10 is thus one Wired electric machine, with a battery operation, so therefore a wireless variant is well within the scope of the invention.
  • the electrical connection 18 is arranged on a rear side 19 of the machine housing and is preferably suitable for fastening a connection cable by means of a known quick connection technology.
  • the tool region 12 forms a front side 20 of the machine housing 11.
  • the connecting section 15 extends on a lower side 21, the handle 14 on an upper side 22 of the machine housing 11.
  • a tool holder 23 for holding and receiving exemplified tools 24 or 25 is further arranged.
  • the tool holder 23 is arranged on the front side of a tool shaft 26.
  • the tool holder 23 advantageously has a bayonet 118, wherein also other fastening means, e.g. Clamp or screw means are possible.
  • An eccentric weight 117 is advantageously arranged on the tool holder 23.
  • the eccentric weight 117 projects as a segment of a circle segment from the drive part 33 downwards in the direction of the tool holder 23.
  • an eccentric 27 is provided, with the eccentric movements of the tool shaft 26 can be generated.
  • the eccentric 27 is disposed in the tool area 12 of the machine housing 11. It would be possible, for example, instead of the eccentric 27, for example, a manual transmission accommodate with multiple speed levels in the tool area 12.
  • the eccentric 27 forms, so to speak, a main gear of the hand-held power tool 10th
  • a distance between the drive motor 17 and the driven eccentric 27 and the tool holder 23 with respect to a longitudinal axis 28 of the machine housing 11 is present. This distance is bridged by a transmission gear 29, which rotatably couples the drive motor 17 with the eccentric 27.
  • the transmission gear 29 has a transmission member 30 in which it is present and a transmission belt 31. Conceivable, however, would be a transmission by means of a toothed gear or a transmission rod, for example, a propeller shaft.
  • the transmission belt 31 couples a driven part 32 of the drive motor 17 with a drive part 33 of the eccentric 27, thus a drive part for the tool holder 23.
  • Matching the transmission belt 31 is the output member 32 and the drive member 33 to pulleys or pulleys to the Transmission belt 31 is looped.
  • edges 34 are advantageously provided, between which the transmission belt 31 finds secure hold.
  • a corrugation 35 on the components 31, 32 and / or 33 is also expedient, so that reliable operation and reliable hold of the transmission belt 31 on the output part 32 and / or drive part 33 are ensured as well.
  • the drive part 33 rotates about a drive axis 36, to which a tool axis 37 of the tool holder 23 about an eccentricity 38th eccentric, but parallel.
  • a motor shaft 39 of the drive motor 17 rotates about a motor shaft 40.
  • the output member 32 is rotatably mounted on the motor shaft 39.
  • the drive shaft 36 and the motor shaft 40 each extend from the top 22 to the bottom 21 of the machine housing 11.
  • the arrangement is such that the motor shaft 40 and the drive shaft 36 are parallel to each other, whereby inclination are conceivable.
  • it does not necessarily have to be such that the tool axis 37 and the drive axle 36 are parallel to one another, even if this is preferred.
  • the motor shaft 40 and the drive axle 36 extend perpendicular to a machining surface 41 of the tool 24 or 25, and therefore also perpendicular to a workpiece surface to be machined.
  • the remote arrangement of drive motor 17 and eccentric 27 in the hand-held power tool 10 allows ergonomically advantageous housing various components, such as a controller 42 which is disposed in the interior of the handle 14. From the controller 42, a board is exemplified. Coupled directly to the control 42 is an adjusting element 43, for example an adjusting element for setting a rotational speed.
  • a motor switch 45 is arranged, which is ergonomically placed. Namely, an operator can comfortably grip the handle 14 by grasping around the handle 14 through a through-hole 46 passing between the handle 14 and the connecting portion 15 is provided. The motor switch 45 can then be conveniently pressed with, for example, the thumb to turn the drive motor 17 on and off.
  • the handle extends somewhat obliquely downwards, that is to say in the direction of the tool holder 23, so that a kind of waisting is provided at the transitional area between the tool region 12 and the handle 14, which is ergonomically advantageous.
  • the handle is slightly enlarged, which allows a comfortable palm rest.
  • the connecting portion 15 is not only used for stiffening and reinforcing purposes, but also contains functional elements, namely, for example, a receiving space for the transmission member 30.
  • the connecting portion 15 has a relatively large transverse width, which also benefits the stability of the machine housing 11.
  • a broad receiving space for the transmission belt 31 is created so that its dreams 47 from the output part 32 to the drive part 33 and back again can have a relatively large distance from each other.
  • the strands 47 run close to side walls 48 of the connecting portion 15th
  • a dust discharge channel 49 is arranged in the connecting section 15.
  • the dust removal channel 49 extends in a channel housing 50, which encases the dust discharge channel 49, as far as it runs in the interior of the machine housing 11. Thus dust-laden air does not enter the interior of the machine housing 11.
  • the dust removal channel 49 extends from the tool holder 23 to a configured for connection of a suction hose discharge port 51 on the rear side 19 of the machine housing 11, that is also on the output member 32 over.
  • the channel housing 50 accordingly has an adapted outer contour, expediently also to provide movement space for the transmission member 30.
  • the space concept of the hand-held machine tool 10 also enables optimum cooling of the components which heat up during operation, also with regard to ergonomic handling.
  • Cooling air can namely flow through inlet openings 52 on side sections of a peripheral wall 53 of the tool area 12 and on the side walls 48, near the tool area 12 into the machine housing 11.
  • the cooling air then flows on the one hand on the eccentric 27, so that this is cooled, wherein the cooling air flowing there is introduced in particular in the connecting portion 15, on the other hand through the handle 14 through, where it cools the controller 42 and also for a pleasant Temperature of the handle 14 provides for the operator to then pass the drive motor 17 before the cooling air leaves the machine housing 11 through discharge openings 54 on the rear side 19.
  • all the essential components in the interior of the machine housing 11 are cooled.
  • a fan 55 which is arranged on the motor shaft 39, generates the cooling air flow. It goes without saying that a fan wheel can also be provided for generating a dust removal air stream, for example where a speed sensor 56 is arranged on the motor shaft 39.
  • the fan 55 is arranged close to the outflow openings 54, namely in the vicinity of the underside 21. Thus, therefore, the fan 55 and the output member 32 are positioned side by side. It is understood that even at the top 22 of the machine housing 11, for example, a fan wheel would be conceivable. Further, for example, could a differently designed as the eccentric gear 27 gear a fan to be provided to generate the air flow in the tool area 12.
  • the drive motor 17, which heats up relatively strongly during operation, is arranged away from the handle 14 in the space concept of the hand-held power tool 10, which represents a clear difference from conventional grinding machines in which the motor is arranged in the handle. Furthermore, the machine housing 11 is optimally balanced, so to speak, since the drive motor 17 can be counterweight for the eccentric gear.
  • eccentric gear 27 which are advantageous in connection with the drive concept of the hand-held power tool 10, but can of course also be used when a drive motor is arranged, for example, directly next to the eccentric gear 27 and this directly drives, eg via an angle gear (bevel gear, etc.).
  • the drive member 33 is rotatably connected to a drive shaft 57, for example in one piece with this.
  • the drive shaft 57 is mounted by means of drive shaft bearings 58, 59 rotatably about the drive shaft 36 to a transmission housing 60 of the eccentric 27.
  • the drive shaft bearings 58, 59 are arranged, for example, in bearing receivers, in particular stages, of the transmission housing 60.
  • the drive shaft bearings 58, 59 are ball bearings, although other types of rolling bearings or slide bearings are also conceivable.
  • the drive shaft 57 rotates centrically to the transmission housing 60th
  • the drive shaft 57 is configured here as a hollow shaft which receives the tool shaft 26.
  • a middle, rod-like portion of the tool shaft 26 penetrates a central portion of the drive shaft 57, which is there, as it were, fitted.
  • the bearings 58, 59 are located between tool shaft bearings 61, 62, which are arranged at opposite end portions of the drive shaft 57, for example, on a bearing receiving part 63 on the tool holder 23 opposite side and in an interior of the drive part 33.
  • the bearing receiving part 63 is rotatably connected to the drive shaft 57, could also be integral therewith.
  • a projection of the bearing receiving part 63, which is located in the interior of the drive shaft 57, could also serve for transverse support (transverse to the axes 36, 37), but this is not the case here, since the support on the two tool shaft bearings 61, 62 takes place.
  • the gear housing 60 is now rotatably received in the machine housing 11, for which suitable form-fitting contours, screws and the like are provided.
  • a floating storage by means of rubber rings or other elastic elements, for example, is possible.
  • the tool shaft bearings 61, 62 form a tool shaft bearing. If the drive shaft 57 is now driven by the drive part 33, a bearing friction of the tool shaft bearings 61, 62 ensures that the tool shaft 26 is also taken to this rotation about the drive axis 36 and thus performs a rotational movement. If no braking torque acts on the tool shaft 26, the tool shaft 26 will rotate immediately As the drive shaft 57.
  • Such an operating mode of the eccentric 27 is hereinafter referred to as free-rotation eccentric mode F.
  • the tool holder 23 can also be placed in a forced rotation, whereby it undergoes so-called hypercycloidal movements, i. on the one hand, a rotation about the drive axis 36, on the other hand, a superimposed eccentric caused by the eccentricity 38.
  • This mode is referred to as forced rotation eccentric mode Z, so that the hand machine tool with the eccentric modes F and Z a total of two rotation eccentric modes F , Z has.
  • a forcible rotation guide 64 which includes a rolling element 65 and a rolling base 66. At least in the forced rotation eccentric mode Z of the rolling elements 65 with the tool shaft 26 is rotationally fixed and the rolling base 66 with the gear housing 60 rotatably, thus also the machine housing 11, rotatably. This is emphasized because by canceling one or both of the aforementioned rotational strengths, the forced rotation could be canceled, which is not the case in the embodiment. Rather, the rolling element 65 and the rolling base 66 are displaced relative to each other so that they are engaged in the forced rotation eccentric mode Z to effect the forced rotation. In the other rotation eccentric mode, namely the free rotation eccentric mode F, the rolling element 65 and the rolling base 66 are separated from each other.
  • the rolling element 65 is configured as a planetary gear, which is arranged in the interior of a rolling gear 66 forming the ring gear. In forced rotation eccentric mode Z, there is a positive fit between these two components, so that the rolling element 65 meshes with its toothing on the outer circumference with the toothing on the inner circumference of the rolling base 66.
  • an only eccentric mode N is possible in which the tool 24 or 25 does not rotate about the drive axis 36, but only performs the eccentric 38 caused by the eccentric movements when the drive motor 17 is running.
  • rotational angle guide means 67 are engaged with the tool shaft 26.
  • the rotation angle guide means 67 comprise a first linear guide 68, and a second linear guide 69, which are at right angles to each other at an angle, in the present case.
  • a guide axis q of the first linear guide 68 runs, for example, transversely to the longitudinal axis 28, a guide axis 1 of the second linear guide 69 parallel to the longitudinal axis 28, of course, other orientations of the first and second linear guides 68, 69 relative to each other and / or the machine housing 11 in principle also would be possible.
  • the linear guides 68, 69 include first and second guide members 70, 71 and a guide base 72 rotatable relative to the gear housing 60.
  • the second guide member 71 is sandwiched between the first guide member 70 and the guide base 72.
  • the second guide element 71 forms an intermediate layer.
  • the second guide element 71 is designed in the manner of a carriage, which is mounted so as to be bidirectionally movable between the first guide element 70 and the guide base 72, namely along the guide axes 1 and q of the two linear guides 68, 69.
  • the guide base 72 is rotationally fixed with respect to the transmission case 60 except for buffering, but linear displaced.
  • a holder 73 for example, linear guide bushes, grooves or the like comprehensive sliding guides 74, in which guide projections 75 of the guide base 72 are mounted so as to move along a control axis, for example, parallel to the drive axis 36th
  • a coupling by means of a rotary adjustment or other angular positions of the adjusting axis to the drive shaft 36 would also be possible depending on the type of actuation of the rotation angle guide means for engaging and disengaging with the tool shaft 26.
  • the guide projections 75 protrude from the guide base 72 in the direction of the holder 73. This in turn is rotatably held in a receptacle 76.
  • a receptacle 76 For example, by adjusting the guide base 72 relative to the bracket 73 by means of the slide guides 74, it is possible to bring the rotation angle guide means 67 into engagement and disengagement with the tool shaft 26 to switch to the only eccentric mode N or back out of it into one of the rotation eccentric modes F or Z.
  • a spring 78 loads the rotation angle guide means 67 in the coupling position.
  • the spring 78 is supported on the one hand on the holder 73 and on the other hand on the guide base 72 from.
  • the spring 78 is further penetrated by a pin 79 which also penetrates into a mating bore on the guide base 72 to provide further stabilization thereof.
  • the holder 73 is configured as an elastic holder. It comprises for example a block-like buffer 73b made of rubber or an elastic plastic, in which the sliding guides 74 are accommodated.
  • the two sliding guides 74 are radially away from the drive axle 36, along which the central bolt 79 runs.
  • a torque acts on the sliding guides 74.
  • the sliding guides 74 can rotate slightly about the drive axis 36, namely around a buffer path 80.
  • the buffer path 80 is advantageously limited by rotational stops 81. When the guide projections 75 are designed around the buffer path 80 at the maximum, they strike the rotation stops 81.
  • this operating state is extremely rare, so that a vibration-poor operation of the hand-held power tool 10 is possible by the designed as an elastic buffer holder 73.
  • the corresponding guides are in the present case configured as sliding guides, it being expedient to use matching metal materials or plastics, e.g. Brass on steel or the like, so that the rotation angle guide means 67 operate with low friction, which reduces the noise and is also energy efficient.
  • linear guides 68 and / or 69 could have some play transverse to their axes q and 1.
  • the first guide member 70 which is formed here by a projection 82 on the rolling body 65, in engagement with a guide receptacle 83 on the second guide member 71, so to speak, the intermediate element.
  • side guides 160 From the second guide member 71 is up, i. in the direction of the guide base 72, side guides 160 from.
  • the side guides 160 which are configured as walls (frame-like configurations or hooks are also possible) are inwardly, i. in the direction of the guide base 72, holding projections 161, so that the guide base 72 can be guided from below under the guide projections 163.
  • the retaining projections 161 hold the second guide element 71 on the guide base 72, in particular when disengaging from the tool shaft 26.
  • the rotation angle guide means 67 are balanced so to speak.
  • a balance recess 62 is arranged on the projection 82.
  • Further guidance measures can be taken so that, for example, a guide projection 163 is arranged in the guide receptacle 83 and engages in the direction of a guide recess 164 on the associated projection 82 of the rolling element 65.
  • the eccentric 27 is easily switchable. A one-hand operation for switching between the operating modes F, Z and N is possible. There are not several controls or controls required, but it is sufficient a single handle 84, which is designed here as a rotary handle. Schiebebetuschistsbeatene, bevel gear or the like would be optional in other embodiments, but are not realized in the hand-held power tool 10.
  • the shift handle 84 is at the top 22 of the Machine housing 11 is arranged so that it can be easily grasped. Conveniently, the arrangement of the switching handle 84 on the head portion 44 of the tool area 12.
  • the switching handle 84 are provided appropriately marks that represent the operating modes F, N and Z symbolically, so that an operator at the respective rotational position of the control handle 84 directly set respectively recognize the selected operating mode.
  • the motor switch 45 blocks an adjustment of the control handle 84 when it turns on the drive motor 17. It is also possible that the switching handle 84 blocks the motor switch 45 when no unique switching position is set. Between a drive switch and a gearshift switch of a hand-held machine tool according to the invention, a locking of the gearshift switch by the engine switch and / or vice versa in at least one position of the engine switch or the gearshift switch is expediently provided.
  • the switching handle 84 forms a component of switching means 85 for switching the eccentric gear 27.
  • the switching handle 84 acts via a coupling joint, which in the present case is designed as a universal joint 86 (other joints would be conceivable) on an actuating member 87, which in turn is coupled with a link operating member 88 in turn. in the present case is rotationally coupled.
  • the actuator 87 is configured as a kind of cap for the transmission.
  • the actuating member 87 is rotatably mounted on a front of the cover 77 projecting portion of the bolt 79.
  • a projection 89 of the lid 77 engages in a receptacle 90 of the actuating member 87, so that in this respect a rotary guide is realized.
  • the actuator 87 can rotate on the lid 77, when Embodiment around the drive shaft 36, wherein an axial offset would be possible.
  • the slide actuator 88 includes an annular body 91 which is also rotatably mounted about the drive axle 36 within the transmission housing 60. From the annular body 91 are pivot bearing projections 92 radially outward from which engage in a rotary guide 93 of the gear housing 60.
  • the rotary guide 93 is designed for example as an annular groove.
  • the rotary guide 93 is formed, for example, between the cover 77 and the transmission housing 60, which facilitates the assembly of the slide actuator 88.
  • the switching handle 84 rotates about an axis which is angled relative to the drive axis 36, wherein the angular offset between the axis of rotation of the control handle 84 and the axis of rotation of the actuating member 87 actuated by it is bridged by the coupling joint designed as a universal joint 86.
  • the driving projections 94 are driving projections 94, for example three, frontally from, i.
  • the driving projections 94 penetrate the cover 77. This has this ring grooves 95, for example, on the outer circumference of the receptacle 90.
  • the driving projections 94 engage in driving recesses 96 of the actuator 87 rotatably (a rotational game would be conceivable), so that the actuator 87 entrains the slide actuator 88 in a rotary actuator.
  • the slide actuator 88 can naverstellen to one hand to adjust the position of the rotation angle guide means 67 relative to the tool shaft 26 (switching between the modes F and N) and on the other hand, the relative position of the rolling base 66th to the rolling element 65 (switching between the operating modes Z and F).
  • the switching sequence is such that the eccentric 27 passes from the forced rotation eccentric Z mode in the free rotation eccentric mode F and from there into the only eccentric mode N and vice versa (N - F - Z).
  • counter track followers 97 slide along a gate 98 of the gate actuator 88 from a lower portion (closer to the first guide member 70) to a higher portion 100 (further away from the first guide member) 70), so that thereby the second guide member 71 and the guide base 72 are lifted from the first guide member 70 against the spring force of the spring 78.
  • the linear guide engagement between the guide elements 70, 71 is then canceled, so that the tool shaft 26 can rotate freely.
  • the SchmidtissenGermaner 97 can in turn get back into the lower portion 99, so that the guide elements 70, 71 engage and the eccentric cam mode N is set.
  • the SchmidtissenGermaner 97 are presently designed as radially outwardly projecting projections of the second guide member 71.
  • the "package" of guide base 72 and second guide member 71 can be moved into the interior of the ring body 91 in turn or something out of it to switch between the two operating modes N and F.
  • the slide actuator 88 For actuation of the rolling base 66, ie for their adjustment in the forced rotation eccentric mode Z or out, the slide actuator 88 also has link follower 101, which cooperate with a counter runner 102 of a counter link member 103.
  • the Schmidtkulissenglied 103 includes an annular body 104, on the front side of the counter-backdrop 102 is arranged. The Schmidtkulissenglied 103 in turn actuates the rolling base 66th
  • the Wälzbasis 66 and the Jacobkulissenglied 103 are both rotationally fixed, as well as with respect to the drive shaft 36 firmly connected to each other, so that an adjustment of the Gegenkulissengliedes 103 causes an adjustment of the Wälzbasis 66 directly and vice versa.
  • the Wälzbasis 66 is locked with the Jacobkulissenglied 103, for example.
  • the Gegenkulisse 102 is a ring backdrop, so that the slide follower 101 slides on rotation of the slide operating member 88 on the counter-guide 102 along.
  • the Jacobkulisse 102 now has deep portions 106 and higher portions 107, which are rotatably offset by 120 ° to each other corresponding to the gate followers 101, so that an annular uniform support of the gate follower 101 is given to the Schmidtisse 102 and vice versa.
  • this is also the case with the upper pair of links, since the counter-link followers 97 are arranged diametrically opposite one another, so that a uniform support of the rotational-angle guide means 67 on the link 98 is possible.
  • Theellesmaschineer 97 are formed by the Drehlagervorsprüngen 92, at least from the radially inner portions. On the underside of these rotary bearing projections 92 locking projections 108 are arranged, which slide on the counter-guide 102 along. Now, when the slide followers 101 slide along the higher portions 107, thereby the counter link member 103 is force-applied in a direction away from the rolling element 65, so that the rolling base 66 is moved away from the rolling element 65 and disengaged arrives. Then, the tool shaft 26 is free of the forced rotation guide 64 and can rotate freely relative to the drive shaft 36.
  • the free rotation eccentric mode F is set.
  • the rolling base 66 and the counter link element 103 firmly connected thereto are non-rotatable with respect to the drive axle 36, but can be adjusted parallel to the drive axle 36 by means of linear guides 110.
  • the linear guides 110 comprise guide rods 111, which are fixedly connected to the lid 77. In any case, the linear guides 110 extend parallel to the drive axle 36 and are fixed relative to the gear housing 60.
  • the guide rods 111 penetrate guide seats 112 on plantskulissenglied 103 and the rolling base 66, which are provided on respective guide projections 113.
  • the guide projections 113 are radially outward in front of the ring body 104 and the annular rolling base and are also against rotation in grooves 114 on the inner circumference of the gear housing 60, so that the combination as Wälzbasis 66 and counter link member 103 is exclusively linearly movable, but secured against rotation.
  • the bayonet 118 comprises a bayonet disc 119, which is spring-loaded by means of a spring arrangement, for example a spring assembly 120.
  • a screw 121 penetrates the spring assembly 120 and the bayonet disc 119 and is screwed from below into the tool shaft 26.
  • the spring assembly 120 loads the bayonet plate 119 in the direction of a pressure plate 122.
  • From the bayonet disc 119 are bayonet projections 123, 124 radially outwardly from, wherein the bayonet projection 124 is narrower than the other two bayonet projections 123.
  • the projections 123, 124 together form a rotation angle coding 125.
  • the bayonet projections 123, 124 can be inserted through bayonet recesses 126, 127 on bayonet receptacles 128 or 129, ie machine mounts, the tools 24, 25, wherein subsequently the tool 24 or 25 is rotated relative to the tool holder 23, so that the projections 123, 124 come with Schugreifvorsprüngen 130 of the bayonet receptacles 128, 129 for abutment or abut against rotational stops 131.
  • the bayonet recesses 126 extend over larger rotational angular distances than the narrower bayonet recess 127. Only the narrower bayonet projection 124 passes through them. Thus, it is only possible that rotation-angle-sensitive tool 25, namely the delta plate to attach to the tool holder 23 when the tool holder 23 and the tool 25 are rotationally correct to each other. Thus, therefore, the recesses 126, 127 form a counter-coding 132, which cooperates with the rotation angle coding 125.
  • the tools 24, 25 have on their advantageous elastic bottom expediently Velcro or other fastening means 180 for attachment of a sanding sheet or a polishing element.
  • Suction openings 181 are also advantageously arranged on the underside, which communicate via channels leading to the top of the tools 24, 25 with a suction space 117b, which is connected to the dust discharge channel 49.
  • the tools 24, 25 are provided with annular seals 149 which seal on the tool holder 23 in the mounted state in cooperation with the tool holder 23, the suction chamber 117b.
  • the rotation lock comprises a latch 133, which is expediently actuated by a push handle 134.
  • the latch 133 acts in its locking position in which it engages or engages behind one of the bayonet projections 123 or 124, as the second, the rotation stops 131 opposite rotational stop.
  • the latch 133 is advantageously spring-loaded in the locking position.
  • the operator only has to operate the push handle 134, i. in the direction of the working surface 41 of the tool 25 to adjust the latch 133 in its release position.
  • the locking occurs almost automatically when the delta tool 25 is rotated to its correct position, namely, when its tip 135 faces the front 20 of the machine housing 11.
  • the rotation angle guide means 67 have advantages: Namely, if they are in the eccentric only mode N, the tool holder 23 can no longer rotate about the drive shaft 36. A fastening and releasing the tool 24 is thus very easy to accomplish by a simple rotational movement.
  • the rotation angle guide means 67 functions as a so-called spindle stop.
  • the rotation angle guide means 67 which is advantageous in the case of the tool 25, are brought into engagement with the drive shaft 57 in only one rotational angle position of the tool shaft 26, so that the angular position of the tool receptacle 23 relative to the operating position of the tool 25 in relation to the machine housing 11 fits (tip 135 to the front 20), but alternatively, another or more other angular positions are conceivable, so that the tip 135 could project obliquely or laterally transversely in front of the machine housing 11.
  • the protrusion 82 on the rolling element 65 is configured such that it fits in the guide seat 83 only in the correct rotational angle position relative to the second guide element 71.
  • guide surfaces 136, 137 have different distances from the tool axis 37 intersecting diagonals of the rolling element 65, corresponding to guide surfaces 138 and 139 on the associated guide receptacle 83.
  • the guide surfaces 136-139 By off-center or eccentric arrangement of the guide surfaces 136-139, it is only possible, they engage with each other when the rotational angle of the projection 82, and therefore also the thus rotatably fixed tool shaft 26 and the tool holder 23 to the rotational position of the machine side rotational angle stable second guide element 71 fits.
  • the rotation angle guides 67 are in the cam-only mode N, i. the guide members 70, 71 are engaged also matches the rotational angular position of the rotational angle sensitive tool 25 so that the tip 135 fits forward to the front 20.
  • the tool 25 has an actuating projection 140.
  • This is suitable, for example, for gripping the tool 25 in order to rotate it.
  • the actuating projection 140 also fulfills a blocking function in which it interacts with a blocking body 141.
  • the locking contour 142 passes through a mounting path 143 when mounted on the tool holder 23 and finally assumes an end position 144 in the mounted state.
  • the locking contour 142 cooperates with the locking body 141 and that alternately such that when located in the end position 144 tool 25, an adjustment of the eccentric 27 in one of the rotation eccentric modes F or Z not possible is and vice versa, when the eccentric 27 is adjusted in one of these modes, it is not possible to attach the tool 25 to the tool holder 23.
  • the blocking body 141 is guided on the outside of the transmission housing 60 linear.
  • the transmission housing 60 is therefore closed so far.
  • This measure is particularly advantageous because the locking body 141 projecting in front of the outer contour of the machine housing 11, namely down, at least when he has a in FIG. 10a shown, to the tools 24 or 25 vorverInstitut first position assumes, so to speak, a tool locking position.
  • a passage opening 145 through which a locking projection 146 passes out of the machine housing 11 a risk that dust enters the interior of the machine housing 11.
  • the transmission housing 60 is encapsulated.
  • the locking projection 146 projects from an angular section 147, which in turn protrudes angularly from a rod section 148 of the locking body 141 radially outward (relative to the gear housing 60).
  • the rod portion 148 is guided directly on the outer circumference of the transmission housing 60, that is, it is adapted to the contour of the transmission housing 60.
  • a radial offset between the transmission housing 60 and an outer periphery of the seal 149 which has the tool 25 to the tool holder 23 out, bridged.
  • the locking projection 146 acts in its first position in a region outside the seal 149, namely on the locking contour 142nd
  • An Axialverstellweg the locking body 141 is limited by linear stops.
  • the angle section 147 strikes, for example, on the drive part 33, in particular its lower edge.
  • a circumferential projection 150 acts in the transition region between the gear housing 60 and cover 77 as a longitudinal stop, namely a step 151 of the locking body 141 on the Circumferential projection 150 strikes.
  • the axial travel of the locking body 141 is limited.
  • the bevel gear 152 For its actuation in the first position now acts a bevel gear 152 (other gear, for example, toothed or rope gears are conceivable).
  • the bevel gear 152 comprises an actuator bevel 153 on the actuator 87 and a locking body inclined surface 154 at the upper, free end of the locking body 141.
  • the actuator bevel 153 is provided on an actuating projection 155 which projects radially outward in front of the actuator 87.
  • the actuator 87 is rotated counterclockwise, at least in the direction of the locking body 141, the two inclined surfaces 153, 154 slide along each other, wherein the locking body 141 is adjusted in the direction of the tool holder 23 (see arrow in FIG. 10b ). However, when the actuator 87 is rotated in the opposite direction, the lock body 141 is exposed to the top so that it can move from its first position to the second position.
  • the blocking body 141 is advantageously loaded by a spring 156 in the second position.
  • the spring 156 rests on the one hand on the machine housing 11, i. on the outer circumference of the passage opening 145, and on the other hand on the locking body 141, specifically the angle section 147th
  • the brake member 170 is an annular brake member that rubs with its front side against a brake plate 171, which annularly surrounds the tool holder 23.
  • the brake plate 171, so to speak, a brake ring is, so to speak expediently a replaceable component that can be replaced when worn.
  • a brake segment 172 still protrudes from the brake plate 171 at an angle, on which, due to the eccentricity 38, the tool 24 rubs along in a specific rotational angle position and thereby experiences a braking torque.
  • the brake segment 172 and the brake member 170 are not constantly, but only in certain rotational angle states with each other, so that the braking effect does not take place over an entire rotation of the tool 24, but only partial movements. As a result, an advantageous braking effect can be achieved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Claims (12)

  1. Machine-outil manuelle, en particulier ponceuse et/ou polisseuse, comprenant un moteur d'entraînement (17) destiné à entraîner un support d'outil (23) pour un outil (24, 25), en particulier un disque de ponçage ou un disque de polissage, au moyen d'une transmission à excentrique (27) qui présente un arbre d'entraînement (57) pouvant tourner autour d'un axe d'entraînement (36), couplé en rotation avec le moteur d'entraînement (17), sur lequel est montée une prise d'outil (26), au niveau de laquelle le support d'outil (23) est agencé, de façon à réaliser des mouvements de l'excentrique de façon excentrique par rapport à l'axe d'entraînement (36) au moyen d'un roulement de prise d'outil (61, 62), étant entendu que la prise d'outil (26) effectue des mouvements de rotation dans un moins un mode de rotation de l'excentrique (F, Z), en particulier en raison d'un frottement dans le palier du roulement de prise d'outil (61, 62), lors d'une rotation de l'arbre d'entraînement (57) et/ou au moyen d'un guide de rotation forcée (64), étant entendu que pour un mode d'excentrique seul (N), une position d'angle de rotation du support d'outil (23) par rapport à un boîtier (11) de la machine-outil manuelle (10) peut être définie dans un secteur d'angles de rotation délimité par des moyens de guidage de l'angle de rotation (67), et étant entendu qu'un outil d'excentrique seul (25) pouvant être monté sur le support d'outil (23), ne convenant pas pour un mode de rotation de l'excentrique (F, Z), présente un profil de blocage (142), caractérisée en ce que la machine-outil manuelle forme un composant d'un système qui comprend l'outil d'excentrique seul (25), en ce que la transmission à excentrique (27) présente des moyens de commutation (85) destinés à commuter les moyens de guidage de l'angle de rotation (67) entre le mode d'excentrique seul (N) et l'au moins un mode de rotation de l'excentrique (F, Z) et en ce que les moyens de commutation (85) présentent un corps de blocage (141) pouvant être déplacé entre une première et une deuxième position destiné à venir en butée contre le profil de blocage (142) de telle sorte que lorsqu'un outil d'excentrique seul est monté, une commutation dans l'au moins un mode de rotation de l'excentrique (F, Z) est bloquée et/ou un montage de l'outil d'excentrique seul sur le support d'outil (23) est bloqué lorsque les moyens de commutation (85) sont placés dans l'au moins un mode de rotation de l'excentrique (F, Z).
  2. Machine-outil manuelle selon la revendication 1, caractérisée en ce que le corps de blocage (141) est maintenu par une force de ressort dans la première et/ou la deuxième position.
  3. Machine-outil manuelle selon la revendication 1 ou 2, caractérisée en ce que les moyens de commutation (85) présentent un organe d'actionnement (87) agissant sur un composant de transmission de la transmission à excentrique (27) destiné à commuter entre le mode d'excentrique seul (N) et l'au moins un mode de rotation de l'excentrique (F, Z) et en ce que le corps de blocage (141) est relié de façon fixe avec l'organe d'actionnement (87) des moyens de commutation (85) ou fait partie intégrante de l'organe d'actionnement (87).
  4. Machine-outil manuelle selon l'une des revendications précédentes, caractérisée en ce que les moyens de commutation (85) présentent un organe d'actionnement (87) agissant sur un composant de transmission de la transmission à excentrique (27) destiné à commuter entre le mode d'excentrique seul (N) et l'au moins un mode de rotation de l'excentrique (F, Z) et en ce qu'un bras de levier variable est agencé entre le corps de blocage (141) et l'organe d'actionnement (87).
  5. Machine-outil manuelle selon l'une des revendications précédentes, caractérisée en ce que le bras de levier variable comprend une transmission à coulisse et/ou une transmission à surface inclinée (152) et/ou une boîte de transmission intermédiaire.
  6. Machine-outil manuelle selon la revendication 5, caractérisée en ce que la transmission à surface inclinée (152) comprend une surface inclinée (154) du corps de blocage agencée sur le corps de blocage (141) et/ou une surface inclinée (153) de l'organe d'actionnement agencée sur l'organe d'actionnement (87).
  7. Machine-outil manuelle selon l'une des revendications précédentes, caractérisée en ce que l'organe d'actionnement (87) est monté de façon rotative et le corps de blocage (141) de façon linéaire et en ce qu'un déplacement rotatif de l'organe d'actionnement (87) provoque un déplacement linéaire du corps de blocage (141).
  8. Machine-outil manuelle selon l'une des revendications précédentes, caractérisée en ce que le corps de blocage (141) forme ou présente dans la première position, lorsqu'il vient en butée contre le profil de blocage (142) avec l'outil (25) monté, une butée empêchant un déplacement du mode d'excentrique seul (N) dans l'au moins un mode de rotation de l'excentrique (F, Z) pour l'organe d'actionnement (87).
  9. Machine-outil manuelle selon l'une des revendications précédentes, caractérisée en ce qu'un guide de corps de blocage destiné à guider le corps de blocage (141) par rapport au boîtier (11) entre la première et la deuxième position est réalisé comme guide linéaire (68, 69).
  10. Machine-outil manuelle selon l'une des revendications précédentes, caractérisée en ce que la transmission à excentrique (27) présente un logement de transmission (60) et en ce que le corps de blocage (141) présente un profil adapté au logement de transmission (60) et/ou il vient en butée dans la première position et/ou dans la deuxième position contre une surface de butée du logement de transmission (60) et/ou il est agencé en dehors du logement de transmission (60).
  11. Machine-outil manuelle selon l'une des revendications précédentes, caractérisée en ce que dans la première position, le corps de blocage (141) fait saillie devant le boîtier (11).
  12. Machine-outil manuelle selon l'une des revendications précédentes, caractérisée en ce que lors du montage d'un outil, le profil de blocage (142) traverse un trajet de montage (143), et dans la position montée, il adopte une position finale (144).
EP20110001855 2010-03-19 2011-03-07 Machine-outil manuelle dotée d'un engrenage excentrique et d'un verrou Active EP2366495B1 (fr)

Applications Claiming Priority (1)

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DE201010012021 DE102010012021B3 (de) 2010-03-19 2010-03-19 Hand-Werkzeugmaschine mit einem Exzentergetriebe und einer Sperre

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EP2366495B1 true EP2366495B1 (fr) 2014-01-22

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Publication number Priority date Publication date Assignee Title
US10414014B2 (en) 2017-09-19 2019-09-17 Campbell Hausfeld, Llc Multifunction rotary tool including driveshaft
US10603760B2 (en) 2017-09-19 2020-03-31 Campbell Hausfeld, Llc Multifunction rotary tool including hub

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Publication number Priority date Publication date Assignee Title
DE4118392B4 (de) * 1991-06-05 2010-03-18 Robert Bosch Gmbh Exzenterschleifer
DE4314799C2 (de) * 1993-05-05 1995-04-13 Fein C & E Elektrowerkzeug
DE10104993A1 (de) * 2001-02-03 2002-08-22 Bosch Gmbh Robert Handwerkzeugmaschine zum Schleifen, Polieren oder dergleichen
CN1724216A (zh) * 2005-07-21 2006-01-25 苏州宝时得电动工具有限公司 多功能砂光机

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