Device for production of cavities in walls.

p0001The invention relates to an apparatus for the manufacture of wall recesses, in particular for the installation of sockets for electrical installation devices, such as hollow-wall boxes, with a centering member and spaced to engage with a motorized drive device operated working tool.

p0002From DE-OS 24 10 120 an apparatus for the manufacture of wall recesses of the kind mentioned is known, wherein the centering member consists of a twist drill, which is detachably attached to a holder. This bracket is to the centering forming twist drill, a saw blade ring fixed to a radial distance. Here, the twist drill is so set on the holder that it protrudes beyond the plane of the teeth of the annular blade downwards, so that in the preparation of the wall recess above the centering serving twist drill is already something penetrated the wall. The rear shank end of the centering drill is serving in a drive device, such as a drill is clamped, whereby the total Ausschneidevorrichtung is driven. With this known device, however, can be only one wall recess same diameter produced, so that for wall recesses with differing diameters at least the bracket with the attached circular saw blade on the centering forming twist drill must be replaced.

p0003The object of the present invention is to provide an apparatus of the aforementioned type, with which it is possible without changing tools, produce wall recesses with different diameters at a predetermined diameter range with stepless diameter adjustment.

p0004This object is achieved by the features mentioned in the characterizing part of claim 1. Thereby, it is possible to adjust the radial distance of the working tool to the centering member in a range between a minimum distance and a maximum distance continuously so that when leading around of the working tool to the centering a wall recess with the set radius of appropriate diameter is formed, after previously with the working tool one of the depth of the recess corresponding hole has been formed. For distance setting of the working tool by centering on the one hand and for generating the output port for the working tool on the other hand, the tool carrier is advantageously mounted on a slide parallel to the wall adjustable, and out of the carriage at a supportable on the wall stand in milling longitudinal direction. Here, the stator is advantageously composed of at least two diametrically opposite pillars, at a maximum wall recess comprehensive positioning are supported with its lower end and engage in guides of the carriage having a handle. This handle is a part of the vertical displacement of the carriage and thus of the tool holder and the working tool against the columns, on the other hand the working tool can be advanced in the circumferential direction of the wall recess to be created with the handle.

p0005Thus, the carriage may return with respect to its vertical wall movement automatically to its initial position, is arranged according to a further embodiment feature of the invention between positioning and carriage return means for the slide. This restoring device is advantageously formed from the column comprising pressure springs which are supported at one end on the positioning ring and the other end on the slide. To gleichmäßgigen system of the positioning on the wall during the operation of the positioning ring is provided on its wall facing side advantageously with a support, in particular made of foam rubber, coated.

p0006To define the set distance of the tool carrier by centering this tool carrier is advantageous with at least one clamping screw against the carriage fixed. Here the carriage is advantageously associated with a scale, while the tool carrier, a label is placed, with which on the scale of the set distance between centering and milling associated diameter of the wall recess can be read for finding the desired distance. To facilitate finding the adjustment positions that correspond to the most common, sub-standard diameters of cavity wall boxes used which is arranged in a carriage associated guide tool carrier is advantageously locked in these positions of adjustment.

p0007For easy handling of the device, it is proposed to form the handle consists of two opposing handles on the carriage. However, it is also possible to form the handle from a distance the carriage as orbiting grip ring, which is connected via spokes to the carriage. To facilitate the manual power transmission for extending circumferentially advancing the cutter grip ring with the spokes connected advantageously via a ratchet mechanism, which in the feed direction of the router to handle ring combines a form-fitting with the carriage, while the handle ring against the direction of the cutter relative to the slide free is back rotation. This is advantageous in that, for generating a manual rotary movement through 360 ° does not need to be converted handles. The centering member advantageously formed from a pointed pin can be determined in all cases in which the feed of the working tool is performed manually in the circumferential direction on a diametrical strut of the positioning ring.

p0008An independent from the manual handling feed in circumferential direction of the manufactured wall recess can thereby be achieved that the tool carrier via a arranged on the slide feed gear can be brought into circulation by the centering member in an advantageous embodiment of the invention. In this case, like a central pinion shaft of the held on the carriage drive device be both the input drive member of the feed mechanism and the input drive member of a cutter gear for autorotation of the cutter. Here, the feed gear drives advantageous to a rotatably mounted on the carriage turntable on which is the tool carrier mounted radially. This rotary plate advantageously has a toothed rim which is provided with a pinion, which is coaxially coupled to a mounted on the carriage and meshing with the pinion gear shaft.

p0009An easy storage of the tool carrier adjustable halter side rotating plate can be achieved advantageously by the turntable evenly with its periphery on three arranged distributed on the slide guide rollers is mounted.

p0010For replacement of the working tool and also its drive other hand, according to another feature of the invention, the tool carrier has a drive spindle advantageously supported with a chuck for milling cutter or drill, the drive spindle is coupled with an output member of the tiller gear forming gear. Here, the cutter gear advantageously comprises a gear meshing with the gear of the drive spindle intermediate, which is also to the pinion shaft in engagement with the pinion shaft, the idler gear and the gear by a pair of two-part gear members - of both during and after the shift - a so-called two-stroke tool carrier are held against the turntable engaged.

p0011To a compact unit working tool and tool carrier to each other operate separately, according to another embodiment of the invention, except that of a private Erstmotor driven working tool also of this drive motor halternde and rotatable around the centering tool carrier can be driven by an exclusively associated therewith second engine. The distribution of drive power to two motors and the reduction of the components for adequate feed gear enabling a compact construction of the device. This can be especially also be achieved that the educated as a geared motor Second motor is fixedly connected to the tool carrier and engages with a pinion in an internal ring gear which is fixed to a relative to a positioning in the tool longitudinal axis movable carriage for a design feature of the invention.

p0012For supplying the electric current to the peripheral connected to the toolholder motors of the invention for a further embodiment feature, the slide associated with slip rings, contact the set with the rotatable tool carrier Stromabgreifern. The slip rings are preferably disposed side by side at a distance from the insulating material formed from an internal ring gear and is connected to power lines, between which a in the area of ​​the handle is arranged, by a push pin operable switch is connected.

p0013To a continuous adjustment of the distance between the centering and to achieve the working tool, to a further embodiment feature of the invention, optionally configured as a geared motor Erstmotor is set on a one recess of the tool carrier covering plate which is pivotable and lockable connected to the tool carrier. Here the Erstmotor with a shank portion and a chuck, the holding plate and the tool carrier for positioning is towards penetrating, can be clamped by means of a fixed on the holding plate clamping ring.

p0014To protect the operator and also the components of the invention of the internal gear, the tool carrier, the guide rollers, the retaining plate and the two motors are covered by a slide on releasably attached hood to a further design feature. However, in order to be able to allow the accessibility of the components in a simple manner, the hood is advantageously connected by means of a quick-action closure with the carriage.

p0015Thus at high speed of the work implement its adjustable storage can be supported on a broad basis, is at the turning to the centering tool carrier with an arm is mounted, the free end of a chuck for the working tool superimposed which via at least two gear with reverse gear ratios same speed of the central drive motor rotates. By using a pivot arm for continuous radial adjustment of the working tool with respect to the centering member, the mounting of the swing arm through its support on a broad scale can make low. It is advantageous to mount the pivot concentric to the shaft of the second wheel of the first gear stage, since no center distance for pivotally working tool in this associated gear stage occur in this way.

p0016To generate a relative to the speed of the work implement substantially slower motrisch operated orbital motion of this work tool to the centering the shaft of the second wheel of the first gear stage is the tap for several downstream, mounted on the tool carrier gear stages for reducing the circulation speed of the tool holder with respect to the engine speed. It may advantageously be formed from the collar of a longitudinal direction of the working tool displaceable but non-rotatable slide the last wheel of the last gear stage to the circulates the first wheel of the last gear stage together with the tool carrier and the swivel arm.

p0017To achieve a simple construction of the reduction gear for the rotation of the tool carrier that is formed of a first disc and a thereto distance-wise arranged second disc, said discs being connected to each other via the shafts of the gear stages, and the disks except the last gear stage all the other reduction stages between to include. The drive motor of the tool carrier disc adjacent to the collar of the carriage is rotatably mounted.

p0018Although it is conceivable to form the gear stages friction wheels, gears or the like. use, yet it is advantageous to form the gear stages of belt drives.

p0019An encapsulated gear unit can advantageously be made by that the slide is designed like a pot which is under bordered at its lower side of the second, also cup-shaped and open on the side plate of the tool carrier, the gear stages are housed in the cavity of the slide.

p0020The invention is illustrated in embodiments in the drawing and is explained in detail below. Show it:<dl id="dl0001"><dt>Fig. 1</dt><dd>a from the motor drive of the working tool apart exclusively manually operated device in a vertical section along the line I - I of Figure 2.</dd><dt>FIG. 2</dt><dd>the apparent from FIG. 1 device in a plan view,</dd><dt>Fig. 3</dt><dd>the device shown in a broken sectional view in the direction of arrow III of FIG. 2 seen from the scale for adjusting the distance between the centering member and the working tool can be seen,</dd><dt>Fig. 4</dt><dd>the edge region of a designed as a grip ring handle in a sectional view, the grip ring is connected to the set on the carriage spokes on a ratchet gear,</dd><dt>Fig. 5</dt><dd>a further embodiment of the inventive device in a half-section along the line V -. V of Figure 6, wherein besides the drive motor of the working tool also its feed movement motor takes place in circumferential direction of the wall recess to be created,</dd><dt>Fig. 6</dt><dd>the apparent of FIG. 5 device in a broken plan view,</dd><dt>Fig. 7</dt><dd>a plan view of the tool holder with the cutter gear the working tool associated in a schematic illustration, wherein the working tool is in its greatest distance from the location centering,</dd><dt>Fig. 8</dt><dd>one of the FIG. 7 similar plan view of the device in which the working tool is in its smallest possible Arbstand from centering. </dd><dt>Fig. 9</dt><dd>one of two motors driven device in a vertical section along the line IX - IX of Figure 10.</dd><dt>Fig. 10</dt><dd>. Consisting of 9 device shown in a plan view along section line X - X of Figure 9 in a partially broken sectional view.</dd><dt>Fig. 11</dt><dd>consisting of Figs. 9 and 10 device shown in a view in the direction of arrow XI of Fig. 10,</dd><dt>Fig. 12</dt><dd>a transmission having an apparatus in a longitudinal section along the line XII - XII. of Figure 13,</dd><dt>Fig. 13</dt><dd>the apparent from Fig. 12 apparatus, in a schematic plan view illustrating the reduction stages of the reduction operation.</dd></dl>

p0021The apparent from FIGS. 1 to 4 embodiment, only the drive for the self rotation of the working tool 10 is carried on motorized manner, for which purpose, in the simplest case, as the drive unit 12 an electric drill can be used which is received in a tool support 13. can be used in a known manner as a working tool 10, a router that is necessary, may be exchanged for another working tool in the chuck of the drill designed as a drive unit 12th The tool carrier 13 is arranged transversely to the longitudinal axis of the working tool 10 slidably in the slide 15 of a carriage 14, and can be set in this link 15 by means of a an elongated hole 16 of the slide 14 by cross clamping screw 17th The carriage 14 is slidably guided on a stand 18 in cutter longitudinal direction, wherein the stator 18 in the present case consists of at least two diametrically oppositely disposed pillars 19, which are fixed with its lower end on a can be placed on the wall positioning the twentieth These columns 19 engage with your top end in guides 21 of the carriage 14 and are oberendig provided with the guides overarching stop which the respective column 19 superior disc 22 may be formed from a, in turn, for example, by a screw 23 to the column 19 is set. The carriage 14 has a handle 24 which is at the apparent from FIGS. 1 to 4 embodiment, surrounds the carriage 14 as a grip ring 25 and is connected thereto by spokes 26th

p0022there is a restoring device, for example, the column 19 enclosing springs may be made be formed, which are supported at one end on the positioning ring 20 and the other end on the slide 14 and against the restoring force of the slide 14 relative to the positioning ring 20 in cutter longitudinal axis between the positioning ring 20 and the carriage 14 can be moved.

p0023The integral with the columns 19 positioning 20 has at the apparent from FIGS. 1 to 4 embodiment, a diametrical strut 28 at which the centering member 11 is fixed, which is formed in this embodiment from a pointed pin 29 in the diametrical strut 28 is screwed. there is a support 30, which is preferably made of a foam rubber ring and is used for example in an annular groove of the positioning ring 20 such that the bottom surface of the positioning is slightly beyond on the underside of the positioning 20th

p0024On slide 14 is located in the region of the slot 16 is a scale 31, which is associated with a tool carrier 13 associated marker 32, and thus the distance position of the working tool 10 against the centering member 11 is read. To easily adjust the spacing position of the cutter 10 against the centering for the most common, sub-standard diameter of the cavity wall sockets used, the use of non-illustrated locking devices between the gate 15 of the carriage 14 and the tool holder 13 is possible. These locking means may be formed for example in a known manner of a on a fixed component and ball catch from one arranged on the other component recess.

p0025In addition, 33 can be replaced, the rigid connection between the carriage 14 and the grip ring 25 by the use of which is arranged between the spokes 26 and 25 grip ring ratchet gear. This ratchet mechanism allows a reverse rotation of the grip ring 25 against the feed movement circumferentially around the centering member 11 around, so that the operator on the grip ring 25 does not have to reach around to accomplish the forward movement of the cutter 10 to a full circular movement of 360 ° to the centering member 11 around ,

p0026To produce a wall recess with the apparatus described above, the required distance between the centering member 11 and the cutter 10 by means of the scale 31 and the marker 32 is initially set and defined by the clamping screw 17th Then fix the operator by means of the handle 24, the device with the positioning ring 20 at the desired location on the wall, and 12 take the drive unit for driving the working tool 10 in operation. Then the operator presses on the grip ring 25 to slide 14 with the fixed mind toolholder 13 and the supported thereto cutter 10 toward the wall so that the cutter 10 is a hole in the wall to the desired at the set distance to the centering member 11 depth or introduced by the wall itself. Then the operator rotates in the depressed position of the slide 14 that together with the positioning ring 20 and fixed to the slide tool fixture 13 to the centering member 11 around until a circle was described by 360 °, and thus the desired wall recess is formed.

p0027In this embodiment, a manual feed in the circumferential direction of the wall recess to be created is required. In the apparent from FIGS. 5 to 8 embodiment, the force exerted in the circumferential direction feed motion via a motor drive is provided. Although the basic structure of the group consisting of FIGS. 5 to 8 to that apparent apparatus corresponding to that of FIGS. 1-4 apparent apparatus, the apparatus described above is modified in the manner described below. This device comprises as shown in Figs. 1 to 4 device shown one of a carrier formed from columns 19 stand 18 with guides 21 content Erten and in the vertical direction manually movable slide 14, on which a drive unit 12, for example in the form of a geared motor, is set. The columns 19 are also fixed by its lower end to a positioning ring 20, which also has a lower side formed from a foam rubber ring pad 30th From the center of this positioning ring 20 projects above the support 30 before a centering member 11 in the form of a set at the top of the device and at the bottom sharpened cylinder pin. On the carriage 14 a handle 24 is also arranged, which is formed, however, in which apparent from FIGS. 5-8 embodiment, two diametrically opposed handles 34th

p0028In contrast to the above described embodiment, protrudes from the example embodied as a geared motor drive unit 12, a pinion shaft 35 to the clearance between carriage 14 and positioning 20 before. In addition, a turntable 36 is positioned as opposed to the embodiment described below of the carriage 14 which is mounted on at least three evenly distributed on its periphery arranged guide rollers 37th These guide rollers 37 in turn are rotatably mounted on the carriage 14th The rotary plate 36 has in turn an indication ends to the carriage 14, in this case, internally toothed gear rim 38 which is part of a feed transmission. 39 This ring gear 38 meshes with a pinion 40 which is coaxially coupled to a gear 41 which in turn engages the pinion shaft 35, in turn, the input transmission element of the feed gear 39 forms, which also includes the pinion gear 41 and together with it mounted on the carriage 14 gear 41 belong.

p0029Below the turntable 36 is at this -. In particular from Figures 7 and 8 can be seen - a spacer plate 42 is fixed, which has a threaded bore 43 for receiving the clamping screw 17, with the help of over the link 15 displaceable tool carrier 13 on the turntable 36 is fixable. This tool carrier 13 a spindle drive 44 is mounted, having a chuck 45 for holding the work tool 10th Between the turntable 36 and the toolholder 13, a gear 47 is rotatably connected to the drive spindle 44, which in turn communicates via an intermediate wheel 48 rotationally connected to the pinion shaft 35 of the drive unit 12th The gear 47 and the intermediate wheel 48 form with the also the feed gear 39 common pinion shaft 35, the cutter gear 46 for driving the work tool 10. In order to enable a stepless displacement of the tool carrier 13, while maintaining the driving connection of the drive spindle 44 with the pinion shaft 35, the axis the intermediate wheel 48 bipartite by a pair of transmission gates 49 and 50 - which are referred to in the transmission doctrine as a two stroke - associated with the axes of the pinion shaft 35 and the gear 47, so that in any case the adjustment the gear 47 with the intermediate 48 is engaged , which is also always is in turn connected to the pinion shaft 35 in engagement. The pinion shaft 35 is never directly connected to the gear 47 in engagement, but only via the intermediate 48th

p0030In the apparent from FIGS. 5 to 8 embodiment, a scale 31 and a label 32 is also provided, which for adjusting the distance between the centering member 11 and the working tool 10 of the corresponding diameter of the produced wall recess can be read. The scale is 31 assigned to the turntable 36 and secured, for example on the spacer plate 42, when the cursor 32 is located on the tool carrier. 13

p0031Also in this a motorized circumferential feed containing device is first in accordance with the set distance to the centering member 11 at first only driven working tool 10 in the space provided in the wall of a hole in the depth of the proposed wall recess or through the wall, by manually depressing the carriage 14 drilled towards his salary Erten over the positioning ring on the wall stand 18th The then switchable feed gear 39 is rotated then the above meaning the turntable 36, with which together the tool carrier 13 and the working tool 10 rotates and the wall recess ausfräst. During this milling procedure, the carriage needs to be 14 only held in its depressed position.

p0032The apparent from Figures 9 to 11 apparatus comprises a housing formed of a ring substantially carriage 14 which is guided on a stand 18 in the longitudinal direction of the working tool 10 slidably. The stator 18 consists of at least two diametrically oppositely disposed pillars 19, which are fixed by its lower end to a wall placed onto the positioning ring 20th These columns 19 engage with their upper end in guides 21 of connecting strips 52 of the slide 14 and are oberendig provided with the guides cross-stop, which can for example be formed from a respective column 19 superior and set on this lock washer 52 in the form of a Seeger ring , The carriage 14 has a handle 24, which is formed in the embodiment of ring segments which are connected to opposite sides of the carriage 14 at this over some guides 21 for the column 19 containing compound strips 52nd

p0033Between the positioning ring 20 and the carriage 14 a resetting device 27, for example, the column 19 enclosing springs can be formed of which are supported at one end on the positioning ring 20 and at the other to the carriage 14, and against the restoring force of the slide 14 relative to the positioning ring 20 can be moved along the longitudinal axis of the working tool 10th

p0034The integral with the columns 19 positioning 20 has its underside on a layer formed of, for example, two foam rubber rings support 30 and is connected to a ring pipe 53, which can telescopically immersed in a on the tool carrier 13 under-side angle ring 54 when depressing the carriage 14th

p0035The tool carrier 13 essentially consists of a circular disc, fixed to which three upstanding guide rollers 37, which are guided with peripheral recesses on a fixed on the carriage 14 ring rail 55 and thus the tool holder 13 in the axial direction non-displaceably but rotatably supporting the carriage fourteenth In the center of the circular tool carrier 13 which is made of, for example, a pointed rod centering member 11 is arranged by a connecting shoe 56 is fixedly connected to the tool carrier. 13

p0036On the tool carrier 13, a motor bracket 57 is fixed also on one side, which in turn serves as the terminal of an electric motor formed with an integrated reduction gear secondary Motores 58th On the drive shaft, this second Motores a pinion 40 is fixed, which in turn meshes with an internal ring gear 38, which in turn is fixed non-rotatably and non-displaceably on the carriage fourteenth The internal ring gear 38 and the pinion 40 together with the second motor 58, a feed gear 39, by which the tool support 13 can rotate around the center of the centering member eleventh

p0037On the side opposite the second motor 58 side, the tool holder 13 has a recess 59 which is covered by a retaining plate 60, 17 and 61 is fixed on the tool carrier 13 by means of clamping screws. Except clamping functions, the clamping screw 61 will also assume also the function of a pivot axis for the holding plate 60, which is pivoted to change the distance of the working tool 10 to the centering member 11 by the clamping screw 61 around. The breakthrough having a retaining plate 60 also has a clamping ring 62, with which the shaft part 64 of a chuck having 45, possibly formed as a geared motor Erstmotors 63 is fixable to the holding plate 60th Thus, the trained example as cutters working tool 10 is independent of the operation of the feed gear 39 driven by the second motor 58 via Erstmotor 63rd

p0038To power the motors serve the carriage 14 associated slip rings 65, which are spaced one above the other in the formed of insulating internal ring gear 38th These slip rings contact 65 Slip rings 66, which are fixed to the tool carrier. 13 Of these Stromabgreifern 66 lead wires 67 at a specified example the second motor 58 distributor 68, from which the current is fed to a second for the motor and the other for 63 Erstmotor out.

p0039The power supply to the slip rings 65 is carried by power lines 69 and 70, between which an operable switch disposed 71st Here, the power lines 69 and 70 containing the end of cable is inserted 72 in one of the connecting strips 52, said connection bar 52 is provided for the purpose of accommodating the switch 71 with a cavity 73, which continues to the top of the connection bar 52 down in a bore in which a pressure pin 74 is disposed to actuate the switch 71 and protrudes out of the top of the handle 24th

p0040On the top of the carriage 14, a hood 75 is placed, through which the internal gear 38, the toolholder 13, which guide rollers 37, the holding plate 60 and the two motors 58 and 63 can be covered. This hood 75 is detachably mounted on the carriage by a quick release mechanism 76 is attached to the carriage 14, with which the hood 75 can be pressed and secured in this position against the top of the carriage fourteenth

p0041Before using the from the Fig. 9 - 11 apparent apparatus, it is necessary to introduce a bore for receiving the centering member 11 in the wall. Only then the device is recognized by that is inserted with the tool carrier 13 rotating centering member 11 in the wall hole, after which additionally introduced by commissioning the Erstmotors 63 via the trained example as cutters working tool 10, a bore in the set distance to the centering member 11 in the wall , By activating the second motor 58, the retaining plate is connected to the toolholder 13 60 set in rotation, so that the working tool 10 starts to revolve the centering member 11, thereby forming an annular milling groove is produced in the wall. The encompassed by the milled groove wall portion can then break so that a wall recess for installation of cans produced for electrical installation equipment.

p0042Consisting of Figs. 12 and 13 ersichtlicheVorrichtung has a pot-shaped slide 14 which is guided on a stand 18 in the longitudinal direction of the working tool 10 slidably. The stator 18 consists of at least two diametrically oppositely disposed pillars 19, which are fixed by its lower end to a wall placed onto the positioning ring 20th These columns 19 engage with their upper end in guides 21 of handle 24 of the carriage 14 and are oberendig the guide cross-stopper provided with a, for example, of a respective column 19 superior and set on this lock washer 51, for example in the form of a Seeger ring, may be formed. The carriage 14 has a handle 24, which comprises, for example on opposite sides of the carriage 14 connected thereto ring segments.

p0043Between the positioning ring 20 and the carriage 14 a resetting device 27, for example, the column 19 enclosing springs can be formed of which are supported at one end on the positioning ring 20 and at the other to the carriage 14, and against the restoring force of the slide 14 relative to the positioning ring 20 can be moved along the longitudinal axis of the working tool 10th The integral with the columns 19 positioning 20 is connected to an annulus 53 which telescopically can plunge when depressing the carriage 14 in a on the tool carrier 13 under-side ring jacket.

p0044In the closed top of the carriage 14 is fixed as a single drive unit 12 is an electric motor, which centrally engages with its motor shaft 77 in the interior of the carriage. This motor shaft 77 is fixed with an extension shaft 78 which is on the underside a centering member 11 attached to the form of a rod and connected in such a way with this, that the pointed end of the centering member 11 the positioning ring 20 surmounted underside.

p0045The cup-shaped slide 14 has, at its upper-side ground concentric with its center penetrating motor shaft 77 an annular collar 79, to which via a not shown in detail, however, common bearing a first pulley is mounted 80, with a further rolling bearing the extension shaft 78 of the motor shaft 77 is supported. At a distance to the first plate 80 a second disc is stored 81 on the extension shaft 78, which engages under the slide 14 at its open end, and a downwardly projecting annular jacket 82, the annular tube 53 of the positioning ring 20 overlap telescopically. The first disc 80 forms together with the second disc 81 the tool carrier 13 which can rotate around the centering member 11 due to the enclosed between these feed gear 39th

p0046Below the plate 80 is connected to the extension shaft 78 of the motor shaft 77 a first wheel 83 firmly connected, rotationally fixed with a bearing on the discs 80 and 81 shaft 85 second, larger wheel connected 84 the first gear stage 86 forms by the first wheel 83 with the second wheel 86 via a belt with each other. In proximity to the disc 81 of the tool carrier 13, a further wheel is on the shaft 85 87 rotatably arranged with the same diameter as the wheel 84 which via a belt drive with a smaller diameter, the fourth wheel 88 - corresponds to the diameter of the wheel 83 - in communication and the second gear 89 is formed. In this case, the fourth wheel 88 is disposed on a shaft 90 which is journalled in a pivot arm 91, which in turn is concentrically mounted to the shaft 85 to the disc 81 of the tool carrier 13 pivotable. At the of the pivot arm 91 at each projecting end of the shaft 90 it is rotationally fixed with an associated em chuck 45, which in turn work implement 10 - can take - in which it will be advantageous to a router.

p0047there is a third transmission stage 92, whose diameter is small wheel 93 is also rotatably connected to the shaft 85 between the gear stage 86 and 89th This wheel 93 is connected via a drive belt, a diameter larger wheel 94 in conjunction, which in turn is rotatably connected to a further, stored in the disks 80 and 81 of the tool carrier 13 wave 95th This shaft 95 a diameter small wheel 96 rotatably is still connected, the fourth gear stage, together with a larger diameter wheel 97 through a belt 98th This wheel 97 is rotatably arranged on a shaft 99 which is likewise rotatably mounted in the discs 80 and 81 of the tool carrier thirteenth This shaft 99 penetrates upward the tool carrier 13 and there comprises a diameter small wheel 100, which is also connected in a rotationally fixed shaft 99th This wheel 100 forms a superimposed belts, together with the large diameter collar 79 of the carriage 14, the fifth gear stage one hundred and first

p0048The pivot arm 91 can be switched by means not shown in any pivotal position between the position shown in Fig. 2 in full lines the shaft 90 and the position shown in dotted lines and be found. Thus with circulating through the feed gear 39 toolholder 13 different large circular groove milling in a wall, wherein the depth of each groove of the employed Cavity wall socket corresponds by the work tool 10 has been correspondingly low previously drilled in the wall. both the working tool 10 and the tool holder 13 in rotation can be set by turning on the electric motor 12th The rotational speed of the work tool 10 due to the squat or translated gear steps 86 and 89 corresponds approximately to the rotational speed of the motor shaft 77 while the rotational speed of the tool carrier 13 is considerably less in accordance with the total reduction ratio and is adapted to the permitted feed of the functions as a milling cutter working tool 10th

p0049As already mentioned, give the embodiments illustrated and described above, the invention only example again, which is by no means alone limited. Rather, they are still many changes and refinements of the invention are conceivable. Moreover, all mentioned in the description and / or essential to the invention shown in the drawing, new features, even if they are not expressly claimed in the claims.

<b>LIST OF REFERENCE NUMBERS</b>

p0050<dl id="dl0002"><dt>10</dt><dd>Working tool / cutter</dd><dt>11</dt><dd>centering</dd><dt>12</dt><dd>drive unit</dd><dt>13</dt><dd>toolholder</dd><dt>14</dt><dd>carriage</dd><dt>15</dt><dd>scenery</dd><dt>16</dt><dd>slot</dd><dt>17</dt><dd>clamping screw</dd><dt>18</dt><dd>stand</dd><dt>19</dt><dd>pillar</dd><dt>20</dt><dd>positioning</dd><dt>21</dt><dd>Leadership, at 14</dd><dt>22</dt><dd>disc</dd><dt>23</dt><dd>screw</dd><dt>24</dt><dd>handle</dd><dt>25</dt><dd>grip ring</dd><dt>26</dt><dd>spoke</dd><dt>27</dt><dd>Reset device / spring</dd><dt>28</dt><dd>Diametrically strut</dd><dt>29</dt><dd>Pen, of 11</dd><dt>30</dt><dd>edition</dd><dt>31</dt><dd>scale</dd><dt>32</dt><dd>mark</dd><dt>33</dt><dd>Ratcheting</dd><dt>34</dt><dd>Handle</dd><dt>35</dt><dd>pinion shaft</dd><dt>36</dt><dd>turntable </dd><dt>37</dt><dd>leadership</dd><dt>38</dt><dd>sprocket</dd><dt>39</dt><dd>feed gear</dd><dt>40</dt><dd>pinion</dd><dt>41</dt><dd>gear</dd><dt>42</dt><dd>spacer plate</dd><dt>43</dt><dd>threaded bore</dd><dt>44</dt><dd>drive spindle</dd><dt>45</dt><dd>chuck</dd><dt>46</dt><dd>milling gear</dd><dt>47</dt><dd>gear</dd><dt>48</dt><dd>idler</dd><dt>49</dt><dd>transmission member</dd><dt>50</dt><dd>transmission member</dd><dt>51</dt><dd>Lock washer</dd><dt>52</dt><dd>connecting strip</dd><dt>53</dt><dd>annulus</dd><dt>54</dt><dd>angle ring</dd><dt>55</dt><dd>ring rail</dd><dt>56</dt><dd>terminal shoe</dd><dt>57</dt><dd>Motorkonsole</dd><dt>58</dt><dd>second motor</dd><dt>59</dt><dd>recess</dd><dt>60</dt><dd>retaining plate</dd><dt>61</dt><dd>clamping screw</dd><dt>62</dt><dd>clamping ring</dd><dt>63</dt><dd>Erstmotor</dd><dt>64</dt><dd>Shank part, at 63 </dd><dt>65</dt><dd>slip ring</dd><dt>66</dt><dd>Slip rings</dd><dt>67</dt><dd>management</dd><dt>68</dt><dd>distributor</dd><dt>69</dt><dd>power line</dd><dt>70</dt><dd>power line</dd><dt>71</dt><dd>switch</dd><dt>72</dt><dd>Electric wire</dd><dt>73</dt><dd>Cavity of 52</dd><dt>74</dt><dd>pushpin</dd><dt>75</dt><dd>Hood</dd><dt>76</dt><dd>Schell clamp closure</dd><dt>77</dt><dd>motor shaft</dd><dt>78</dt><dd>extension shaft</dd><dt>79</dt><dd>Collar, 14</dd><dt>80</dt><dd>disc</dd><dt>81</dt><dd>disc</dd><dt>82</dt><dd>ring Sleeve</dd><dt>83</dt><dd>wheel</dd><dt>84</dt><dd>wheel</dd><dt>85</dt><dd>wave</dd><dt>86</dt><dd>Gear, first</dd><dt>87</dt><dd>wheel</dd><dt>88</dt><dd>wheel</dd><dt>89</dt><dd>Gear, second</dd><dt>90</dt><dd>wave</dd><dt>91</dt><dd>swivel arm</dd><dt>92</dt><dd>Gear, third</dd><dt>93</dt><dd>wheel</dd><dt>94</dt><dd>wheel</dd><dt>95</dt><dd>wave</dd><dt>96</dt><dd>wheel</dd><dt>97</dt><dd>wheel</dd><dt>98</dt><dd>Gear, fourth</dd><dt>99</dt><dd>wave</dd><dt>100</dt><dd>wheel</dd><dt>101</dt><dd>Fifth gear stage,</dd></dl>