DE102005001535B3 - Mounting for mining cutter has security ring with face engaging flat face on cutter shaft - Google Patents

Abstract

The mounting for a mining cutter (1) in a receiver (21.2) of a holder (20) has a fixing section (15) with a face (15.2) on the cutter shaft to engage a corresponding conical face on a securing ring (30). In a first working position, there is a free radial and axial play between the cutter and ring. In a second position, there is a clamping action between these and between the cutter receiver (21.2) and the ring exterior surface. Claims include a demounting tool for the cutter.

Description

The The invention relates to a fastening arrangement for a shank bit in one pick receptacle a chisel holder, the shank bit a chisel head and a chisel shaft having, wherein the drill collar having a fixing portion with functional surface, which with a corresponding counter surface a locking ring is in operative connection, wherein the counter surface of the functional surface at least partially encompasses, wherein the fixing section on the drill collar, the chisel holder and the locking ring are formed so that one through the Fixing section limited relative movement of the locking ring relative to the shank bit between a first division of labor of the shank bit, in which the retaining ring in a front, chisel-tip side Position of the fixing and a second working position at the locking ring in a rear position of the fixing is given.

The Invention further relates to a disassembly tool for disassembly one with a fastening device according to one of claims 1 to 10 in a chisel holder a chisel holder held shank chisel with chisel, the shank bit is held by a retaining ring in the bit holder and wherein the disassembly tool with a Entriegelungsstück whose outer diameter smaller than the inner diameter of the bit holder is attachable to the retaining ring and the retaining ring for the disassembly of the shank chisel from the chisel holder with the unlocking piece when force is moved into an unlocked position.

Out various writings are chisel arrangements, e.g. for cutting tools, which, for example, in road construction used for removing asphalt blankets known. there is a shank chisel in the locating hole of the chisel holder by means of an elastic retaining ring made of plastic, rubber or the like held in a groove of the chisel shaft sits and framed in an annular groove of the receiving bore or a shoulder the receiving bore behind.

Such a fuse is for example in the DE 1533665 A1 described. The securing of the shank bit is done here by the positive connection between the locking ring and the area of the receiving bore behind. It is necessary that the annular groove or the annular shoulder are adapted to the cylindrical receiving bore very precisely the position of the retaining ring on the chisel shank. This is the only way to guarantee a reliable form-locking connection and thus a defined hold. The disadvantage here is that in case of deformation or as a result of contamination of the chisel holder a reliable form-locking connection is not always guaranteed. With a view to a uniform chisel wear is also required that an easy rotation of the chisel must be given. However, this is not possible due to the frictional connection on the retaining ring.

From the DE 2630276 A1 a chisel assembly for a cutting tool is known in which the locking ring, which is intended to secure the shank bit against axial displacement in the receiving bore, is arranged on a rotatably mounted on the collection of the drill shank additional bearing ring. This arrangement ensures at least a free rotation of the bit in the receiving bore. The disadvantage is that additional parts are needed during assembly. Again, a deformation of the retaining ring or due to contamination of the bit holder a reliable form-locking connection is not always guaranteed.

The EP 0163590 A1 shows a shank bit, which is secured in the receiving bore of the bit holder by a plastic ring. It is characteristic that the plastic ring in its cross-section has a substantially U-shaped cross-section and the outer part, formed with a locking edge can engage in a corresponding detent receiving portion of the chisel holder. The plastic ring also has areas with a slit. The disadvantage here is that the insertion of the bit into the bit holder is possible only with great effort by the design of the plastic ring.

From the DE 33 07 895 A1 is a mounting arrangement for a shank bit in a bit holder of a chisel holder of the type mentioned above, in which the axially limited adjustable shank bit in the chisel receiving flow medium are supplied. For this purpose, additional adjusting devices are installed in the bit holder, which increase the construction and effort for the shank bit and do not contribute to easy insertion of the shank bit in the bit holder and holding the shank bit in the bit holder without much effort.

The DE 296 23 508 U1 shows a disassembly tool for a round shank chisel, which is mounted in a chisel holder.

The disassembly tool can be pushed with a Austreibdorn through a drill-shaped bit holder through, so that it is supported at the end of a chisel holder of the round shank chisel. By means of a toggle mechanism ses the Austreibdorn can then be adjusted so that he brings a expelling force in the drill collar.

It Object of the invention, a fastening arrangement of the above mentioned To provide a type in which a shank bit easy on the one hand pick receptacle can be inserted and on the other hand safe against slipping out is held.

It Another object of the invention is to provide a dismounting tool make, with such a shank bit quickly and without much effort from the chisel holder can be removed.

The The object concerning the fastening arrangement is achieved in that in a first working position between the shank bit and the locking ring formed a free radial and axial play is and in a second working position a clamping between the functional area and the counter surface the retaining ring and an inner surface of the bit holder of the chisel holder and an outer contour is formed of the retaining ring. With this arrangement, a simple, power-saving assembly of the shank bit into the chisel holder allows because only small clamping forces Insertion of the shank bit overcome in the chisel holder Need to become. In the operating state results over the clamping mechanism in the second working position a safer Stop and slipping out of the shank bit from the bit holder is safely prevented. To disassemble the shank bit is sufficient Cancellation of the clamping by moving the locking ring relative to the shank bits as a result of a force acting on the retaining ring. So that can the shank chisel then without much effort from the chisel holder be pushed.

In preferred embodiment are the counter surface the locking ring and the functional surface of the fixing as Cone formed, wherein the cone angle of the counter surface to the Cone angle of the functional surface the fixing section is adjusted. This creates a press fit between the counter surface the retaining ring and the functional surface of the fixing, wherein the circlip clamps.

Of the Cone angle of the counter surface form the locking ring and the functional surface of the fixing in a preferred embodiment, an opening angle of 10 ° to 30 °. Ideally the opening angle in the range of 15 ° to 25 °. Thereby On the one hand it is achieved that a sufficient press fit between counter surface the locking ring and functional surface of the fixing and as well the inner surface the chisel pickup and the outer contour the securing ring is ensured, which in particular from the resulting force perpendicular to the central axis at smaller opening angles results. On the other hand, the angle is large enough to slip to prevent the fixing.

If the circlip in addition a front cone surface has, whose opening size is greater As the cross section of the free end of the drill collar, can be a simple Place the locking ring on the fixing section of the chisel shank respectively.

Especially It is advantageous if the cone angle of the front cone surface of the Circlip to the angle of an end chamfer of the chisel shaft is adjusted. This can be done during the placing on the one hand allows a centering and on the other hand a even expansion ensures the locking ring be so uneven and thus also excessive material tensions be avoided in some areas of the retaining ring. It can the circlip is an outside with, arranged parallel to the central axis of the retaining ring Have grooves that reduce the rigidity of the retaining ring and facilitate the placement of the retaining ring on the fixing.

Supported the process when the retaining ring has a slot, the in particular allows an elastic expansion.

has the circlip in addition an at least partially cylindrical outer surface, such that the transition from the partially cylindrical outer surface of the retaining ring to the rear, transverse to the longitudinal axis of the bit extending end surface each formed by chamfers, in addition, a simple insertion of the shank chisel, with the attached circlip, in the chisel holder allows. It is particularly advantageous if the bit holder a Konuserweiterung has at the front and the chamfer angle of the chamfers of the retaining ring at the opening angle the Konuserweiterung are adjusted, which in addition a tilting in the Mounting prevented.

It is advantageous with respect to the assembly of the shank bit in the bit holder, when in the mounted state of the locking ring on the fixing portion of the shank bit, the outer diameter of the outer surface of the locking ring is larger than the outer diameter of the cylindrical portion of the chisel shank. This forms a press fit between the locking ring and the inner surface of the bit holder, which prevents slipping of the retaining ring.

In preferred embodiment, the retaining ring is made of a ductile Material, preferably made of plastic or brass. In particular injection molded parts made of plastic cost-effective in complex geometries to be produced, which is the bit replacement cost helps reduce. Another advantage results from the material properties. The most preferred materials allow the circlip a good grip fit learns as soon as the shank chisel has a movement component in the direction of the bit head. The ductile Enable properties it is there that the outer surface of the Circlip, even with relatively smooth inner surfaces of the Chisel pick up, yourself get caught in fine bumps on the inner surface of the bit holder.

Of the Circlip may also be constructed of two components, wherein the circlip has a core of a first material, the from a softer, the outer contour the retaining ring forming elastic material at least partially is surrounded. This allows a optimal adaptation to the sliding friction properties of the inner surface of the Bit receptacle.

In In another embodiment, the retaining ring in the area the outer surface recesses have, which segment the outer surface. Advantageously, while the segment width of the region cylindrical outer surface of the Circlip to be smaller than the segment width of the recesses. With the segment shape can be in the space between chisel holder and chisel shaft penetrated sanding dust on the back dissipated and on the other hand thereby blocking the chisel is prevented.

The the dismantling tool related task is solved in that the unlocking piece end is provided with a recess and the fixing section of the shank chisel at least partially surrounds and that formed on Entriegelungsstück face for the Attach to the rear end surface of the circlip and for whose Druckkraftbeaufschlagung is provided.

By the dismantling tool acts during the dismantling of the shank chisel on the circlip a force that the circlip in the chisel pickup pushes in an unlocked position. This will be the clamping between functional area the fixing section and the counter surface of the retaining ring and thus also between inner surface the chisel pickup and outer contour of the Circlip lifted. The shank chisel can then easily from the pick receptacle be dismantled.

During the Disassembly of the shank bit encompasses the unlocking piece the fixing portion of the shank bit at least partially and the unlocking piece supports from the circlip.

In order to can be achieved by applying force to the circlip this is relative to the shank bit in the direction chisel head moves and thus eliminates the clamping action. An entanglement between the functional area the fixing and the mating surface of the retaining ring can be lifted by it.

In preferred variant is the release piece a flexible section molded, over the the force is applied. Thus, the shank bit can also from the, usually difficult to access toolholders Push out.

Especially is advantageous if the flexible portion of the dismantling tool is at least partially covered by a flexible leadership, being the length the flexible leadership shorter is as the length the flexible portion of the disassembly tool, and a support area the flexible leadership while the dismantling of the shank chisel on a rear end surface of the chisel holder supported. This can - much like with a nail beater - the circlip evenly, without jamming, relative to the bit holder in the chisel holder forward, towards chisel head to be moved. Furthermore, by the flexible guide a Tilting the dismantling tool prevents, since only the flexible Section of the unlocking piece moved, with the flexible guide on support area is applied. This ensures that the disassembly tool always acting in the right place.

One additional Benefits can be during the dismantling of the shank chisel be achieved when the bit pickup by means of one or more in the region of Entriegelungsstückes and / or cleaned in the area of the flexible section arranged brushes becomes.

One Replacement of a shank chisel This can be particularly time-saving, as an additional Cleaning process before the insertion of a new Schaftmeißels omitted can.

The invention will be described below with reference to an embodiment shown in FIGS explained in detail. Show it:

1 a shank bit with attached circlip and a wear protection element in the sectional view;

2 the shank bit in the assembled state in a chisel holder;

3a a locking ring in the sectional view;

3b the circlip in plan view;

3c the retaining ring in a perspective view;

3d the retaining ring in a further perspective view;

4a schematically a disassembly tool;

4b schematically another variant of the dismantling tool;

5 the shank bit in the bit holder with attached disassembly tool according to the execution 4a ;

6 the shank bit in the bit holder with attached disassembly tool according to the execution 4b ,

1 shows in the sectional view of an exemplary embodiment of a shank bit 10 , the one chisel head 11 with a chisel tip 12 made of, for example, hard metal. The shank chisel 10 supports with a support surface 13.1 a flange 13 on a support surface 41 a wear protection element 40 from, wherein the wear protection element 40 to the flange 13 of the shank chisel 10 a conus extension 43 and, opposite, a cone-shaped approach 42 having. The wear protection element 40 may consist of a hardened material, and ver prevents in a known manner that due to the rotational movement of the Schaftmeißels 10 - in mounted condition during operation - the bit holder 20 (please refer 2 ) is worn too much.

To the flange 13 then the shank chisel points 10 a chisel shaft 14 on, with the chisel shaft 14 a cylindrical section 14.1 and, opposite of the chisel head 11 , followed by a paragraph 14.2 has, on which a fixing section 15 followed. The fixing section 15 initially has a cross-sectional constriction 15.1 , followed by a functional area 15.2 on, wherein the cross-section in this area relative to the cross-sectional constriction 15.1 truncated cone is formed widened. The functional area 15.2 stands with a corresponding counter surface 35.2 an attached circlip 30 who has the functional area 15.2 at least partially encompasses, in operative connection.

According to the invention is the circlip 30 in the axial direction of the shank bit 10 arranged slightly displaceable, such that in a first working position between the functional surface 15.2 of the shank chisel 10 and the counter surface 35.2 of the circlip 30 a free radial and axial play is formed and in a second working position, a clamping between the functional surfaces 15.2 and the counter surface 35.2 of the circlip 30 is formed.

In the embodiment shown, the counter surface 35.2 of the circlip 30 and the functional area 15.2 of the fixing section 15 trained as a cone. The cone angle of the counter surface 35.2 is at the cone angle of the functional area 15.2 of the fixing section 15 customized. This angle is ideally the same. In the illustrated embodiment, the opening angle of the cone angle of the mating surface 35.2 of the circlip 30 and the functional surface area 15.2 of the fixing section 15-20 °.

As the 3a and 3b can be clearly seen, the circlip has 30 a front cone surface 35.1 whose opening dimension is larger than the cross section of the free end of the fixing section 15 of the chisel shaft 14 is that through an end chamfer 15.3 is formed. The cone angle of the front cone surface 35.1 of the circlip 30 is in the example shown at the angle of the end chamfer 15.3 of the fixing section 15 of the chisel shaft 14 customized. In the example shown, the opening angle is about 60 °.

In the fitted state of the retaining ring 30 on the fixing section 15 of the shank chisel 10 is the outer diameter of the retaining ring 30 larger than the outer diameter of the cylindrical portion 14.1 of the chisel shaft 14 ,

2 shows a mounting arrangement in the assembled state 1 for the shank chisel 10 with the circlip 30 out 1 ,

The in the mounting arrangement 1 shown chisel holder 20 has a support part 21 and a base part 22 on. The support part 21 is with a rear end face 21.4 on a front end surface 22.2 of the base part 22 placed. The base part 22 and the support part 21 are cohesively connected to each other at this juncture, for example, held together by a solder joint. As a twist protection and positive support in the circumferential direction has the base part 22 at least one nose 22.4 on that in a recess 21.5 of the support part 21 intervenes. The material of the support part 21 is made of a more resistant material than the base part 22 formed on which the shank chisel 10 with its flange 13 can support. In the in 2 The example shown has the fastening arrangement 1 between the front end surface 21.3 of the support part 21 and the flange 13 of the shank chisel 10 a wear protection element 40 on, which, as mentioned above, the service life of the support member 21 can extend.

The shank chisel 10 stuck with the cylindrical section 14.1 of the chisel shaft 14 in one of the base part 22 and the support part 21 formed chisel pickup 21.1 . 22.1 , Here is the fixing section 15 of the chisel shaft 14 with its functional area 15.2 with the corresponding counter surface 35.2 the fuse ring 30 who has the functional area 15.2 at least partially encompasses, in operative connection.

In a first working position is between the shank bit 10 and the circlip 30 a free radial and axial clearance and in a second working position is a clamping between the functional surface 15.2 and the counter surface 35.2 of the circlip 30 and an inner surface of the bit holder 21.2 . 22.1 of the chisel holder 20 and an outer contour of the retaining ring 30 educated.

The first working position is achieved in particular when a force component on the chisel tip 12 acting on the shank chisel 10 further into the chisel holder 21.2 . 22.1 pushes in, with the shank chisel 10 with its flange 13 on the wear protection element 40 and thus on the front end surface 21.3 of the support part 21 supported. Once a force on the shank chisel 10 whose component is the shank chisel 10 forward from the chisel holder 21.2 . 22.1 This results from the conical shape of the functional surface shown here 15.2 and the counter surface 35.2 of the circlip 30 to the clamping described above, such that the shank bit 10 against slipping out of the bit holder 21.2 . 22.1 is secured.

In the first working position the shank chisel learns 10 a basic safeguard against falling out of the bit holder 21.2 . 22 . 1 guaranteed. The circlip 30 due to its inherent elasticity, it tensions with its outer contour on the inner surface of the chisel holder 21.2 . 22.1 , This clamping is reinforced in the second working position.

In 3 is the circlip 30 in a preferred embodiment shown in different representations.

The in 3a in the sectional view shown locking ring 30 has an at least partially cylindrical outer surface 31 and a hole 35 on, in the example shown from a front conical surface 35.1 and a likewise cone-shaped counter surface 35.2 is formed. The counter surface 35.2 can, as already described with the functional area 15.2 of the fixing section 15 in operative connection. The cone angle of the counter surface 35.2 is at the cone angle of the functional area 15.2 of the fixing section 15 adapted and has in the example shown an opening angle of 20 °. The front cone surface 35.1 has an opening dimension which is greater than the cross section of the free end of the drill collar 14 , The opening angle of the front cone surface 35.1 is in the example shown 60 ° and is ideally at the angle of an end chamfer 15.3 of the chisel shaft 14 customized.

At the at least partially cylindrical outer surfaces 31 of the circlip 30 has the circlip 30 in the transition region to the rear transverse to the longitudinal axis of the retaining ring 30 extending end surface 34 chamfers 36 on.

The shape of the circlip 30 is chosen such that the outer diameter of the outer surface 31 of the circlip 30 larger than the outer diameter of the cylindrical portion 14.1 of the chisel shaft 14 and greater than or equal to the inner diameter of the bit holder 21.2 . 22.1 ,

3b shows the circlip 30 in the plan view. The partially cylindrical outer surface 31 is through recesses 32 segmented, with the recesses 32 as parallel to the central axis of the retaining ring 30 continuous grooves are formed. In addition, the circlip points 30 a slot 37 on. By means of the slot 37 can the circlip 30 when inserted into the bit holder 21.2 . 22.1 are radially tapered in its outer dimension with a spreading force. In a further, not shown embodiment, the recesses 32 in the area of the outer surface 31 shaped such that the segment width of the partially cylindrical outer surface 31 of the circlip 30 smaller than the segment width of the recesses 32 ,

In the 3c and 3b is the circlip 30 shown in different perspective views. They clarify again the embodiment of the preferred embodiment. Such forms can be especially as Produce plastic injection molded part inexpensively. In particular, plastic materials such as ABS or PA on the one hand have a certain resistance to impact resistance in the cold and on the other hand in terms of temperature resistance during operation. In addition, it is advantageous if the material has a certain ductility, which is the clamping effect, especially in smooth bit shots 21.2 . 22.1 favored. Metals, such as brass, can also be used. In certain cases, it may also be necessary for the circlip 30 constructed of two components, the retaining ring 30 a core of a first material, that of a softer, the outer contour of the retaining ring 30 surrounding elastic material is at least partially surrounded.

4a and 4b show schematically a disassembly tool 50 , which is particularly suitable, shank chisel 10 according to the embodiment described above again from the bit holder 21.2 . 22.1 to slide out.

This in 4a dismantling tool shown 50 has an unlocking piece 51 on which a recess 51.2 has and is rigid at least at the end. In the embodiment shown is the Entriegelungsstück 51 at one end as two or more cylinder sections 51.1 or formed as a circumferential cylinder located at a rear end surface 34 of the circlip 30 can support. In this case, the outer diameter of the Entriegelungsstückes 51 smaller than the inside diameter of the bit holder 21.2 . 22.1 of the chisel holder 20 executed. At the substantially rigid unlocking piece 51 is a flexible section in the example shown 52 molded, on whose, the Entriegelungsstück 51 opposite end, a handle area 53 followed. In the area of the unlocking piece 51 and / or in the area of the flexible section 52 In addition, at least one brush 55 be attached to the flexible section 52 and / or the unlocking piece 51 at least partially surrounded.

This simple variant of the dismantling tool 50 is especially useful when on the bit holder 20 There are already openings that provide access to the Entriegelungsstückes 51 to the rear end surface 34 of the circlip 30 enable. The openings in the chisel holder 20 serve as a guide of the flexible section 52 of the dismantling tool 50 ,

4b schematically shows a further variant of the dismantling tool 50 , Here is the flexible section 52 of the dismantling tool 50 at least partially by a flexible leadership 54 shrouded, taking the length of the flexible guide 54 shorter than the length of the flexible section 52 , The flexible leadership 54 has on the side at which the unlocking piece 51 located, a rigid support area 54.1 , which in the inserted state on a rear end face 22.3 of the chisel holder 20 can support. In addition, there is a rigid support area 54.1 on its outside a Abstützflansch 54.2 educated. For better handling is on the flexible guide 54 , the support area 54.1 opposite, a grip area 54.3 educated.

5 shows the handling of the dismantling tool 50 according to the embodiment of 4a , It is for disassembly of the in the chisel holder 21.2 . 22.1 a chisel holder 20 held shank chisel 10 the dismantling tool 50 with its unlocking piece 51 to the circlip 30 stated. The circlip 30 comes with the unlocking piece 51 placed in an unlocked position and / or kept in this during the chisel dismantling. By pushing or by hammering on the grip area 53 of the dismantling tool 50 acts during disassembly of the shank bit 10 only on the rear end surface 34 of the circlip 30 a force entering the circlip 30 in the chisel holder 21.2 . 22.1 in the direction of the chisel head 11 pushes. As a result, the clamping between the functional surface of the fixing section and the counter surface of the securing ring and thus also between the inner surface of the bit holder and outer contour of the securing ring is canceled. The shank chisel 10 can thereby forward from the chisel holder 20 be pushed out.

During disassembly of the shank bit 10 encompasses the unlocking piece 51 the fixing section 15 of the shank chisel 10 at least in certain areas. The unlocking piece 51 rests against the circlip 30 from.

The force can be applied to both a rigid connection between grip area 53 and unlocking piece 51 as well as over one, between grip area 53 and unlocking piece 51 molded flexible section 52 respectively.

6 shows the handling of the dismantling tool 50 according to the embodiment of 4b , It is, as already in 5 shown for disassembly of the in the chisel holder 21.2 . 22.1 a chisel holder 20 held shank chisel 10 the dismantling tool 50 with its unlocking piece 51 to the rear end surface 34 of the circlip 30 stated. The circlip 30 comes with the unlocking piece 51 placed in an unlocked position and / or kept in this during the chisel dismantling. By pushing or by hammer blows on the grip area 53 of the dismantling tool 50 acts during disassembly of the shank bit 10 only on the rear end surface 34 of the circlip 30 a force entering the circlip 30 in the chisel holder 21.2 . 22.1 in the direction of the chisel head 11 pushes. Here is the flexible section 52 of the dismantling tool 50 at least partially by a flexible leadership 54 shrouded, taking the flexible leadership 54 with their support area 54.1 during disassembly of the shank bit 10 on the rear end surface 22.3 of the chisel holder 20 . 21 . 22 supported. The outer diameter of the support area 54.1 is larger than the diameter of the bit holder 21.2 . 22.1 ,

It may be advantageous if the rear end surface 22.3 of the chisel holder 20 . 21 . 22 has a recess into which the support area 54.1 of the dismantling tool 50 can support what a lateral displacement of the dismantling tool 50 during the action of force on the retaining ring 30 prevented. With the mounting arrangement 1 According to the inventive embodiment, on the one hand, an easy assembly of the shank bit 10 in the chisel holder 20 . 21 . 22 , be achieved. On the other hand, the shank bit 10 sufficiently well secured against slipping out. The disassembly of the shank bit from the bit holder 21.2 . 22.1 can be done particularly quickly and inexpensively, in particular by the dismantling method described. Through the dismantling tool described 50 on the one hand good accessibility is achieved and on the other hand a particularly energy-saving replacement of the shank bit 10 allows.

Of course it is also possible the shank chisel 10 This can be done, for example, with an expelling tool which is attached to the free end of the drill collar 14 is set. By means of hammer blows the shank chisel 10 then from the chisel holder 21.2 be knocked out. Also conceivable is the use of Ausziehhebeln, eg. Ausziehgabeln, in the range of the chisel head 11 be set.

1

mounting assembly

10

shank bits

11

chisel head

12

chisel tip

13

flange

13.1

bearing surface

14

drill collar

14.1

cylindrical section

14.2

paragraph

15

fixing

15.1

Cross-sectional narrowing

15.2

functional surface

15.3

end-side chamfer

15.4

end face

20

toolholders

21

supporting part

21.1

flaring

21.2

pick receptacle

21.3

front end face

21.4

rear end face

21.5

recess

22

base

22.1

pick receptacle

22.2

front end face

22.3

rear end face

22.4

nose

30

circlip

31

outer surface

32

recess

33

front end face

34

rear end face

35

drilling

35.1

conical surface

35.2

counter surface

36

chamfer

37

slot

40

Wear protective element

41

support surface

42

approach

43

flaring

50

Removal tool

51

Unlock insert

51.1

cylinder section

51.2

recess

52

flexible section

53

grip area

54

flexible guide

54.1

support area

54.2

support flange

54.3

grip area

55

brush

Claims (14)

Mounting arrangement ( 1 ) for a shank bit ( 10 ) in a chisel holder ( 21.2 . 22.1 ) of a chisel holder ( 20 . 21 . 22 ), the shank bit ( 10 ) a chisel head ( 11 ) and a chisel shaft ( 14 ), wherein the drill collar ( 14 ) a fixing section ( 15 ) with functional area ( 15.2 ), which with a corresponding mating surface ( 35.2 ) of a retaining ring ( 30 ) is in operative connection, wherein the counter surface ( 35.2 ) the functional area ( 15.2 ) at least partially surrounds, wherein the fixing section ( 15 ) on the chisel shaft ( 14 ), the bit holder and the retaining ring ( 30 ) are formed so that one through the fixing ( 15 ) limited relative movement of the retaining ring ( 30 ) opposite the shank bit ( 10 ) between a first division of work of the shank bit ( 10 ) when the retaining ring ( 30 ) in a front, chisel-tip-side position of the fixing portion (FIG. 15 ) and a second working position, in which the retaining ring ( 30 ) in a rear position of the fixing section (FIG. 15 ) is given, characterized in that in a first working position between the shank bit ( 10 ) and the retaining ring ( 30 ) a free radial and axial play is formed and in a second working position a clamping between the functional surface ( 15.2 ) and the counterface ( 35.2 ) of the retaining ring ( 30 ) and an inner surface of the bit holder ( 21.2 . 22.1 ) of the chisel holder ( 20 . 21 . 22 ) and an outer contour of the retaining ring ( 30 ) is formed. Mounting arrangement ( 1 ) according to claim 1, characterized in that the mating surface ( 35.2 ) of the retaining ring ( 30 ) and the functional area ( 15.2 ) of the fixing section ( 15 ) are formed as a cone, and the cone angle of the counter surface ( 35.2 ) to the cone angle of the functional surface ( 15.2 ) of the fixing section ( 15 ) is adjusted. Mounting arrangement ( 1 ) Claim 1 or 2, characterized in that the cone angle of the mating surface ( 35.2 ) of the retaining ring ( 30 ) and the functional area ( 15.2 ) of the fixing section ( 15 ) an opening angle of 10 ° to 30 °; preferably 15 ° to 25 °. Mounting arrangement ( 1 ) according to one of claims 1 to 3, characterized in that the retaining ring ( 30 ) a front cone surface ( 35.1 ) whose opening dimension is greater than the cross section of the free end of the drill collar ( 14 ). Mounting arrangement ( 1 ) according to one of claims 1 to 4, characterized in that the cone angle of the front cone surface ( 35.1 ) of the retaining ring ( 30 ) at the angle of an end chamfer ( 15.3 ) of the chisel shaft ( 14 ) is adjusted. Mounting arrangement ( 1 ) according to one of claims 1 to 5, characterized in that the retaining ring ( 30 ) an at least partially cylindrical outer surface ( 31 ) and that the transition from the partially cylindrical outer surface ( 31 ) of the retaining ring ( 30 ) to the rear transverse to the longitudinal axis of the chisel end face ( 34 ) each by chamfering ( 36 ) is trained. Mounting arrangement ( 1 ) according to one of claims 1 to 6, characterized in that in the attached state of the retaining ring ( 30 ) on the fixing section ( 15 ) of the shank bit ( 10 ) the outer diameter of the outer surface ( 31 ) of the retaining ring ( 30 ) is greater than the outer diameter of the cylindrical portion ( 14.1 ) of the chisel shaft ( 14 ). Mounting arrangement ( 1 ) according to one of claims 1 to 7, characterized in that the retaining ring ( 30 ) consists of a ductile material, preferably made of plastic or brass. Mounting arrangement ( 1 ) according to one of claims 1 to 8, characterized in that the retaining ring ( 30 ) is constructed of two components, wherein the retaining ring ( 30 ) has a core made of a first material, that of a softer, the outer contour of the retaining ring ( 30 ) forming elastic material is at least partially surrounded. Mounting arrangement ( 1 ) according to one of claims 1 to 9, characterized in that the retaining ring ( 30 ) in the area of the outer surface ( 31 ) Recesses ( 32 ), the outer surface ( 31 ), wherein the segment width of the partially cylindrical outer surface ( 31 ) of the retaining ring ( 30 ) is smaller than the segment width of the recesses ( 32 ). Disassembly tool for disassembly of a fastening device according to one of claims 1 to 10 in a bit holder ( 21.2 . 22.1 ) of a chisel holder ( 20 . 21 . 22 ) shank chisel ( 10 ) with chisel shank ( 14 ), the shank bit ( 10 ) by means of a retaining ring ( 30 ) in the bit holder ( 21 . 22 . 22.1 ) and wherein the dismantling tool ( 50 ) with an unlocking piece ( 51 ) whose outer diameter is smaller than the inner diameter of the bit holder ( 21.2 . 22.1 ), to the retaining ring ( 30 ) attachable and the retaining ring ( 30 ) for dismantling the shank bit ( 10 ) from the bit holder ( 21.2 . 22.1 ) is movable with the unlocking piece when force is applied to an unlocking position, characterized in that the unlocking piece ( 51 ) end with a recess ( 51.2 ) and the fixing section ( 15 ) of the shank bit ( 10 ) at least partially encompasses and that the unlocking piece ( 51 ) formed end face for attachment to the rear end face ( 34 ) of the retaining ring ( 30 ) and is provided for its Druckkraftbeaufschlagung. Disassembly tool according to claim 11, characterized in that on the Entriegelungsstück ( 51 ) a flexible section ( 52 ) is formed. Disassembly tool according to claim 11 or 12, characterized in that the flexible section ( 52 ) of the dismantling tool ( 50 ) at least partially by a flexible leadership ( 54 ) is covered, the length of the flexible guide ( 54 ) is shorter than the length of the flexible section ( 52 ) of the dismantling tool ( 50 ), and a support area ( 54.1 ) of flexible leadership ( 54 ) during disassembly of the shank bit ( 10 ) on a rear end surface ( 22.3 ) of the chisel holder ( 20 . 21 . 22 ) is supported. Disassembly tool according to one of claims 11 to 13, characterized in that in the region of the Entriegelungsstückes ( 51 ) and / or in the area of the flexible section ( 52 ) one or more brushes for cleaning the bit holder ( 21.2 . 22.1 ) during disassembly of the shank bit ( 10 ) are mounted.