EP3140511B1 - Schaftmeissel bzw. befestigungsanordnung für einen schaftmeissel - Google Patents

Schaftmeissel bzw. befestigungsanordnung für einen schaftmeissel Download PDF

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Publication number
EP3140511B1
EP3140511B1 EP15722993.1A EP15722993A EP3140511B1 EP 3140511 B1 EP3140511 B1 EP 3140511B1 EP 15722993 A EP15722993 A EP 15722993A EP 3140511 B1 EP3140511 B1 EP 3140511B1
Authority
EP
European Patent Office
Prior art keywords
chisel
shank
receptacle
securing element
clamping element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP15722993.1A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3140511A2 (de
Inventor
Markus Roth
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.)
Betek GmbH and Co KG
Original Assignee
Betek GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Betek GmbH and Co KG filed Critical Betek GmbH and Co KG
Publication of EP3140511A2 publication Critical patent/EP3140511A2/de
Application granted granted Critical
Publication of EP3140511B1 publication Critical patent/EP3140511B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
    • E21C35/18—Mining picks; Holders therefor
    • E21C35/19—Means for fixing picks or holders
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
    • E21C35/18—Mining picks; Holders therefor
    • E21C35/19—Means for fixing picks or holders
    • E21C35/197—Means for fixing picks or holders using sleeves, rings or the like, as main fixing elements
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
    • E21C35/18—Mining picks; Holders therefor
    • E21C35/183—Mining picks; Holders therefor with inserts or layers of wear-resisting material

Definitions

  • the invention relates to a shank chisel with a chisel head and a chisel shank, the chisel shank having a securing element receptacle in which a securing element is arranged.
  • the invention also relates to a fastening arrangement with a chisel and a chisel holder, wherein the chisel can be fastened in a chisel receptacle of the chisel holder, the chisel having a chisel head and a chisel shank, the chisel shank with a clamping element forming a securing element receptacle for a securing element.
  • a round shank bit which consists of a chisel head and a chisel shank, the chisel shank having a circumferential groove with a longitudinally slotted clamping sleeve mounted therein.
  • the clamping sleeve is held in a clamping position by means of a holding member.
  • the chisel shank is axially fixed with the clamping sleeve seated under tension in the bore, but is mounted so that it can rotate freely.
  • the shank chisel in a chisel holder allows movement in the axial and in the circumferential direction during operation.
  • the shank chisel in a chisel receptacle of the chisel holder has a fixing section with a functional surface which is in operative connection with a corresponding counter surface of a securing ring.
  • the free rotation is advantageous when using shank chisels with conventional chisel tips, since the chisel tip on the shank chisel is usually subject to increased wear compared to the holder.
  • By rotating the chisel a more even wear of the chisel tip can be achieved compared to a non-rotating attachment, thus extending the service life of the chisel and the associated maintenance interval.
  • the rotational movement of the bit can cause increased wear of the bit holder due to frictional wear compared to non-rotated chisels.
  • devices that provide a rotatable attachment of the chisel to the chisel holder are often more complex, for example in assembly and disassembly.
  • New types of hard materials which exceed the hardness of the materials previously used for chisel points, nowadays enable the provision of almost wear-free chisel points.
  • the use of such a chisel point also allows a non-rotatable attachment to the chisel holder.
  • U1 discloses a chisel having a chisel head and a shank.
  • a clamping wedge element is held on the shaft and can be adjusted against the bias of a compression spring in the longitudinal direction of the shaft between a locking position and an unlocking position. In the locked position, the clamping wedge element rests with tension on the inner wall of a bore in which the shaft is held.
  • U.S. 5,992,405 discloses a chisel with a chisel head and a chisel shaft formed thereon.
  • the chisel shaft has an internal thread.
  • a nut can be screwed onto this internal thread in order to clamp the chisel in a chisel receptacle of a chisel holder.
  • WO 2013/053811 A1 discloses a chisel with a chisel head and a chisel shaft.
  • the chisel shaft has a circumferential groove.
  • a tension spring is inserted, which is annular.
  • the tension spring has claws on its outer circumference. In the assembled state, these claws rest on the inner wall of a bore into which the chisel holder is inserted.
  • WO 2015/043884 A2 describes a round shank chisel with a chisel head and a chisel shaft. On its side facing away from the chisel head, the chisel shaft has a thread.
  • the pick can be connected to a chisel holder.
  • the chisel holder has a bore for this purpose. A nut is held in the bore so that it cannot rotate. The thread of the shank can be screwed into the nut to fix the pick in the chisel holder.
  • the invention is based on the object of providing a shank chisel or a fastening for a shank chisel, with a simple assembly of a shank chisel in a chisel holder being made possible with a safe and maintenance-optimized mode of operation.
  • a clamping element can be adjusted relative to the chisel shank in such a way that at least part of the outer contour of a securing element is changed, in particular deformed.
  • the shaft chisel can easily be fixed in a chisel holder so that it cannot rotate.
  • the object relating to the fastening arrangement is achieved with the features of claim 10. It is provided that the clamping element can be adjusted relative to the chisel shaft, and that the volume of the securing element receptacle can be changed by adjusting the clamping element relative to the chisel shaft.
  • the shank chisel can easily be inserted into the chisel receptacle of a chisel holder. By tightening the locking element then the chisel was fixed in place. This assembly can be carried out easily and clearly even in confusing places and in rough construction site operations.
  • the securing element consists at least partially of elastic material. This enables simple production of the securing element with good adjustability at the same time, which can then take place by deformation.
  • the chisel shaft and the clamping element are connected to one another in a continuously adjustable manner via a connecting element and a receptacle.
  • the adjustment, in particular the deformation, of the securing element can thus take place in a defined manner, for example by applying a specific torque.
  • the connecting element can be located either on the chisel shank or on the clamping element, the receptacle correspondingly complementary on the clamping element or on the chisel shank.
  • a variant that is easy to manufacture can be the design of the connecting element or the receptacle as a thread.
  • a preferred configuration option is such that the adjustment of the clamping element relative to the chisel shank is limited by means of a stop.
  • a chisel tip made of hard material with a hardness of at least 25 GPa is attached to the chisel head.
  • the chisel tip can consist of cubic boron nitride.
  • a hardness of at least 40 GPa can also be provided for the chisel tip. This can be achieved, for example, with polycrystalline diamond.
  • the resulting high wear resistance of the tip allows the chisel to be fixed in a non-rotatable manner on the chisel holder, which results in less wear on the chisel holder compared to a rotatable fixing can.
  • a wear protection disk between the chisel and the chisel holder can be dispensed with.
  • the chisel head has a tool holder for securing a tool in a form-fitting manner in the circumferential direction.
  • the tool holder is usually easily accessible in the area of the chisel head.
  • a stable shank guide and a stable fixation as well as minimized wear result from the fact that at least part of the chisel shank is formed in a step-like manner by a first cylindrical section, a transition and a second cylindrical section.
  • the securing element has an annular securing element outer surface, an annular securing element inner surface and two radially directed securing element end faces has a positive effect on the fixing properties of the securing element in relation to the chisel holder.
  • Such a design of the securing element can generate an effective clamping pressure even with a slight adjustment of the clamping element.
  • a fuse element can also be easily manufactured.
  • Another advantageous variant of the securing element would be an O-ring, for example. This securing element can be obtained inexpensively as a standard component and it has sufficient pressure stability for the present application.
  • the design of the clamping element in such a way that it has a holding surface for a non-rotatable fixing on the chisel holder enables a rotation-free mounting of the chisel on the chisel holder, which results in less wear on the Chisel holder compared to a rotatable setting can result. This means that there is no need for a wear protection disk between the chisel and the chisel holder.
  • the clamping element is then held by the chisel holder when clamping and does not have to be held with an additional tool. This further simplifies assembly.
  • a simple and definable axial fixation of the chisel on the chisel holder results from the fact that the securing element can be changed, in particular deformed, by changing the volume of the securing element receptacle, in order to secure it in the axial direction through the forces thus generated on the surrounding walls of the securing element receptacle between shank chisel and chisel holder.
  • a limitation of the minimum volume of the securing element receptacle by a spacer has the effect that a securing element located in the volume is protected from damage due to excessive adjustment, in particular deformation.
  • an advantageous embodiment variant provides that the clamping element is mounted so that it cannot rotate in a clamping element receptacle of the chisel holder, and / or that the clamping element is guided axially displaceably in the clamping element receptacle.
  • the non-rotatable mounting facilitates assembly insofar as no separate holding element is required for holding the clamping element, since the chisel holder takes on this function.
  • the axial displaceability in the guide of the clamping element enables a relative adjustment of the clamping element with respect to the chisel, which rests on a support area of the chisel holder.
  • a space can form between the clamping element receptacle and the clamping element, which can be used as an additional space e.g. can serve when the support area is worn.
  • the chisel holder has a chisel receptacle, which is formed step-like by a first cylindrical area, a transition area and a second cylindrical area.
  • the wear properties have a positive effect if the transition of the shank chisel and the transition area of the chisel receptacle are axially spaced from one another in such a way that they form an adjustment space.
  • Fig. 1 shows a tool combination with a shank chisel 10 and a chisel holder 30. As this illustration shows, the shank chisel 10 is mounted in the chisel holder.
  • Fig. 2 shows the assignment of the shank chisel 10 to the chisel holder 30 in more detail.
  • the chisel holder 30 is in the Figures 7 and 8 shown in more detail.
  • the chisel holder 30 has a chisel receptacle in the form of a stepped bore.
  • the chisel receptacle has a first cylindrical region 35 which, via an entry chamfer 34, merges into an annular surface extending radially to the bore axis. This annular surface forms a support area 33.
  • a transition area 36 adjoins the first cylindrical area.
  • the transition area 36 is designed in the form of a conical bore geometry.
  • the chisel receptacle 301 has a second cylindrical area 37. This second cylindrical area 37 is arranged coaxially to the first cylindrical area 35.
  • the chisel holder 301 finally has a further area, which is shown in FIG Fig. 8 can be seen and forms a clamping element receptacle 31.
  • the chisel holder 30 is provided with an opening which is provided in the rear side area of the chisel holder facing away from the support area 33.
  • Fig. 7 shows the design of the clamping element receptacle 31 in more detail.
  • the clamping element receptacle is delimited by shaped surfaces 312 which are at an angle to one another.
  • the shaped surfaces 312 extend axially of the central longitudinal axis of the chisel receptacle 301.
  • Recesses 311 are provided in the transition area between the shaped surfaces 312.
  • the recesses 311 offer a tension-optimized transition between the shaped surfaces 312.
  • six shaped surfaces 312 are used and thus form a hexagonal receptacle, as is known, for example, from the socket of a ratchet.
  • a different number of shaped surfaces is also conceivable, for example in order to form a triangular or square receptacle, etc.
  • the tool combination has the shaft chisel 10 already mentioned above.
  • This shaft chisel 10 is in the Fig. 3 and 4th shown in more detail.
  • the shank chisel 10 has a chisel head 12 on which a chisel shank 16 is integrally formed.
  • the chisel head 12 of the shaft chisel 10 has a chisel tip 11 made of hard material, which is preferably soldered onto the chisel head 12.
  • the cross section of the chisel head increases like a circular cone.
  • the circular cone-like section merges into a tool holder 13, which is formed from surfaces for fixing a tool in a form-fitting manner in the circumferential direction. These allow assembly and disassembly, for example using a wrench, which can also be a torque wrench.
  • the chisel shank 16 adjoins the chisel head via a rounded transition.
  • the chisel shank 16 is designed as a stepped shank. It has a first cylindrical section 161 which, facing away from the chisel head, merges into a second cylindrical section 163 via a transition 162.
  • a connecting element 184 adjoins the second cylindrical section 163, facing away from the chisel head 12.
  • the connecting element 184 is designed in the form of a threaded bolt, which is connected in one piece to the chisel shank 16 is.
  • a first functional surface 182 is formed in the transition area between the connecting element 184 and the second cylindrical section 163. This first functional surface 182 is designed in the form of an annular surface extending radially to the central longitudinal axis of the shaft chisel 10.
  • the connecting element 184 forms a lateral functional surface 183, which in the present case is formed by the threaded section.
  • the connecting element 184 forms an end piece which is provided with a stop 186.
  • the stop 186 is formed by a conical tip. It is also conceivable that the stop 186 is formed by a further cylindrical section in the transition between the second cylindrical section 163 and the connecting element 184. This further cylindrical section could also represent the lateral functional surface 183.
  • the tool combination further comprises a clamping element 20.
  • the clamping element 20 is designed similar to a cap nut.
  • the exact design of the clamping element 20 can be the Figures 5 and 6 remove.
  • the clamping element 20 has a cap section which is delimited on the circumference by holding surfaces 21.
  • the holding surfaces 21 are arranged in a hexagonal shape to one another, similar to a nut.
  • a circumferential bevel 22 is provided which merges into an end-side boundary wall. Facing away from this delimitation wall, the tensioning element 20 has an attachment 26 which, via a projection 261, adjoins the area which forms the holding surfaces 21 in one piece.
  • the clamping element is like this Fig. 6 can be seen, limited by a second functional surface 262.
  • This second functional surface 262 is designed in the shape of a ring and runs radially to the central longitudinal axis of the clamping element 20.
  • the second functional surface 262 merges via a chamfer 27 into a receptacle 25, which in the present case is designed as a threaded receptacle.
  • the receptacle 25 terminates in a conical bore section.
  • This conical bore section forms a stop surface 23.
  • any other geometry is used which forms a stop surface 23.
  • the receptacle can also be designed as a blind hole or the like.
  • the clamping element 20 has the holding surfaces in the form of a hexagonal arrangement, as described above.
  • a different geometry can also be selected in this area.
  • Triangular or square, etc. geometries are also conceivable.
  • the holding surface 21 should form a detent in the circumferential direction.
  • the tool arrangement also comprises a securing element 40.
  • the securing element 40 is formed from an elastic material, for example a rubber-like material, etc. It has an annular securing element outer surface 41 and an annular securing element inner surface 42.
  • the securing element outer surface 41 and the securing element inner surface 42 are connected to one another by means of radially extending securing element end faces.
  • the securing element end faces 43 run parallel to one another and are arranged opposite one another on the securing element 40.
  • the securing element 40 is penetrated by a central opening 44.
  • Fig. 3 shows, with its central opening 44 pushed onto the connecting element 184 of the shaft chisel. This pushing-on movement is limited by one of the securing element end faces 43. This securing element end face 43 strikes against the first functional face 182 of the chisel shaft 16.
  • the tensioning element 20 is then placed on the connecting element 184. This assembly movement is made easier with the chamfer 27. This bevel 27 threads onto the stop 186.
  • the tensioning element 20 can then be screwed onto the external thread of the connecting element 184 with its internal thread provided in the region of the receptacle 25.
  • Thread connection preferably designed with self-locking.
  • the preassembled shaft chisel 10 can be inserted into the chisel receptacle 301 of the chisel holder 30.
  • the insertion of the shank chisel 10 into the chisel receptacle is made easier with the stepped shank design and the stepped bore design of the chisel holder 30.
  • the shaft chisel 10 can be easily inserted with its free end into the chisel receptacle 301, which offers advantages in particular in the case of confusing assembly conditions. In the assembled state it says how Fig.
  • a suitable screwing tool for example a torque wrench, is placed on the tool holders 13 in the area of the chisel head 12.
  • the tensioning element 20 is received in the tensioning element receptacle 31 in such a way that the holding surfaces 21 rest in a form-fitting manner in the circumferential direction on the shaped surfaces 312 of the tensioning element receptacle 31.
  • the shaped surfaces 312 and the holding surfaces 21 form in the axial direction of the Shank chisel 10 a sliding guide.
  • the clamping element 20 slides into this sliding guide.
  • a space 32 between the attachment 26 and the upper edge of the clamping element receptacle 31 is enlarged. This space 32 likewise forms an additional space.
  • the volume of a securing element receptacle 181 changes (see FIG Fig. 2 ) in which the fuse element 40 is housed.
  • the securing element receptacle 181 is limited by the lateral functional surface 183 of the connecting element 184, by the first functional surface 182 of the chisel shank 16 and by the second functional surface 262 of the clamping element 20. If the clamping element 20 is now adjusted in the direction of the chisel head 12, the available volume within the securing element receptacle 181 is reduced, which leads to a deformation of the elastic securing element 40.
  • the outer circumference of the securing element 40 increases in such a way that it rests against the inner wall of the chisel receptacle 301 under a tensioning effect.
  • the securing element 40 presses with its securing element outer surface 41 against the inner wall of the second cylindrical region 37.
  • the securing element inner surface 42 rests against the outer contour of the lateral functional surface 183.
  • the securing element 40 can be used to fix the shank chisel 10 in a captive manner in the axial direction of the shank chisel 10.
  • the shaft chisel 10 with the clamping element 20 is fixed in the chisel receptacle 301 so that it cannot rotate.
  • the fastening arrangement 1 again has a shank chisel 10, a chisel holder 30, a clamping element 20 and a securing element 40.
  • the chisel holder 30 and the securing element 40 are identical to the chisel holder 30 and the securing element 40 according to the variant described above.
  • the shank chisel 10 is equipped in the area of its free shank end with a receptacle 25 in the form of a threaded receptacle.
  • This receptacle 25 is introduced into the first functional surface 182 coaxially to the central longitudinal axis of the shaft chisel 10.
  • the tensioning element 20 now has, corresponding to the receptacle 25 provided with the internal thread, a projection which is provided with an external thread, like this Fig. 13 clearly shows.
  • the external thread forms the connecting element 184.
  • Fig. 10 shows that the securing element 40 with its opening 44 is pushed onto the connecting element 184.
  • the clamping element 20 can then be screwed into the receptacle 25.
  • the securing element 40 with its two securing element end faces 43 comes into contact with the first functional surface 182 and the second functional surface 262.
  • the securing element inner surface 42 is arranged in the region of a cylindrical section of the connecting element 184. This cylindrical portion forms the functional side surface 183 like this Fig. 13 shows.
  • a stop 186 is provided in the transition area of the cylindrical section to the threaded section of the connecting element 184.
  • the shank chisel 10 can be rotated relative to the clamping element until the stop 186 touches the first functional surface 182 and thus limits the screwing-in movement.
  • the tensioning element 20 can be clamped in its threaded connection so that it cannot be lost.
  • the screwing-in movement of the clamping element 20 is also limited, so that a minimum Volume of the fuse element receptacle 181 cannot be distinguished.
  • the securing element 40 is not squeezed in an inadmissible manner and thus cannot be damaged.
  • the cylindrical area of the tensioning element which forms the lateral functional surface 183, forms a spacer 185.
  • the loads acting on the shank chisel in a jerky manner may result in the support area 33 of the chisel holder and / or the support surface 13 of the chisel head being subject to wear, for example deformation.
  • the adjustment spaces 17 are provided in both tool variants.
  • the shaft chisel can readjust axially in these readjustment spaces if there is wear. Since the clamping element 20 is also held in the sliding fit in the clamping element receptacle 31, a readjustment can also take place here via the space 32.
  • the exemplary embodiments described illustrate the simple possible assembly and disassembly of the shaft chisel 10 according to the invention to form a fastening arrangement 1 according to the invention. This can be done by means of a wrench or a similar tool.
  • the fact that the fixing unit 18, consisting of the shank chisel 10, the clamping element 20 and the securing element 40, can be preassembled, as shown in FIGS Figures 2 and 8th evident.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Milling Processes (AREA)
  • Workshop Equipment, Work Benches, Supports, Or Storage Means (AREA)
EP15722993.1A 2014-05-08 2015-05-07 Schaftmeissel bzw. befestigungsanordnung für einen schaftmeissel Not-in-force EP3140511B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014106484.4A DE102014106484A1 (de) 2014-05-08 2014-05-08 Schaftmeißel bzw. Befestigungsanordnung für einen Schaftmeißel
PCT/EP2015/060070 WO2015169900A2 (de) 2014-05-08 2015-05-07 Schaftmeissel bzw. befestigungsanordnung für einen schaftmeissel

Publications (2)

Publication Number Publication Date
EP3140511A2 EP3140511A2 (de) 2017-03-15
EP3140511B1 true EP3140511B1 (de) 2020-12-16

Family

ID=53181276

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15722993.1A Not-in-force EP3140511B1 (de) 2014-05-08 2015-05-07 Schaftmeissel bzw. befestigungsanordnung für einen schaftmeissel

Country Status (10)

Country Link
US (1) US10385690B2 (enExample)
EP (1) EP3140511B1 (enExample)
JP (1) JP6556223B2 (enExample)
CN (1) CN106489018A (enExample)
AU (1) AU2015257693B2 (enExample)
BR (1) BR112016025980B1 (enExample)
DE (1) DE102014106484A1 (enExample)
DK (1) DK3140511T3 (enExample)
RU (1) RU2016147905A (enExample)
WO (1) WO2015169900A2 (enExample)

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DE102015119119A1 (de) * 2015-11-06 2017-05-11 Betek Gmbh & Co. Kg Werkzeugsystem
DE102016108306A1 (de) * 2016-05-04 2017-11-09 Jürgen Stehr Rotierendes Fräswerkzeug mit einer Vielzahl von auswechselbaren Werkzeugköpfen und Werkzeugkopf für ein solches rotierendes Fräswerkzeug
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Also Published As

Publication number Publication date
BR112016025980A2 (enExample) 2017-08-15
DE102014106484A1 (de) 2015-11-12
BR112016025980B1 (pt) 2022-03-03
RU2016147905A3 (enExample) 2018-06-08
WO2015169900A2 (de) 2015-11-12
US20170074098A1 (en) 2017-03-16
WO2015169900A3 (de) 2015-12-30
DK3140511T3 (da) 2021-02-08
US10385690B2 (en) 2019-08-20
JP6556223B2 (ja) 2019-08-07
RU2016147905A (ru) 2018-06-08
CN106489018A (zh) 2017-03-08
AU2015257693A1 (en) 2016-12-01
AU2015257693B2 (en) 2018-03-29
JP2017517660A (ja) 2017-06-29
EP3140511A2 (de) 2017-03-15

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