EP2963237A1 - Schneidmeißelhalterung mit verstellbarem Winkel - Google Patents

Schneidmeißelhalterung mit verstellbarem Winkel Download PDF

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Publication number
EP2963237A1
EP2963237A1 EP14175520.7A EP14175520A EP2963237A1 EP 2963237 A1 EP2963237 A1 EP 2963237A1 EP 14175520 A EP14175520 A EP 14175520A EP 2963237 A1 EP2963237 A1 EP 2963237A1
Authority
EP
European Patent Office
Prior art keywords
shaft
assembly
bit
shoulder
holder body
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.)
Withdrawn
Application number
EP14175520.7A
Other languages
English (en)
French (fr)
Inventor
Joseph Fader
Alfred Lammer
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.)
Sandvik Intellectual Property AB
Original Assignee
Sandvik Intellectual Property AB
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 Sandvik Intellectual Property AB filed Critical Sandvik Intellectual Property AB
Priority to EP14175520.7A priority Critical patent/EP2963237A1/de
Priority to AU2015203149A priority patent/AU2015203149A1/en
Priority to US14/790,618 priority patent/US20160003041A1/en
Priority to CN201510423883.1A priority patent/CN105240010A/zh
Publication of EP2963237A1 publication Critical patent/EP2963237A1/de
Withdrawn legal-status Critical Current

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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
    • E21C35/197—Means for fixing picks or holders using sleeves, rings or the like, as main fixing elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/18—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by milling, e.g. channelling by means of milling tools
    • B28D1/186—Tools therefor, e.g. having exchangeable cutter bits
    • B28D1/188—Tools therefor, e.g. having exchangeable cutter bits with exchangeable cutter bits or cutter segments
    • 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
    • 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

Definitions

  • the present invention relates to a cutting bit retaining assembly for mounting a cutting bit at a cutting machine and in particular although not exclusively, to the assembly configurable to change the attack angle of the bit.
  • a drive body in the form of a rotatable drum or drill head comprises a plurality of replaceable cutting bits that provide the points of contact for the material or mineral face.
  • a mobile mining machine comprises a rotatable cutting head with the cutting bits provided on rotating drums.
  • the bits contact the surface of the rock they occasionally break and inevitably wear resulting in decreased cutting inefficiency and a need for replacement. It is therefore desirable to mount the cutting bits at the cutting head (or drive body) via releasable mounting assemblies that enable the bits to be replaced conveniently and quickly during servicing and repair.
  • Cutting bit (alternatively termed 'cutting pick' or 'tool pick' ) mountings are described in US 3,342,531 ; US 3,627,381 ; US 3,932,952 ; US 4,343,516 ; US 5,261,499 ; WO 96/31682 ; US 5,799,741 ; WO 98/39553 ; US 2008/0258536 ; US 2008/0309148 ; WO 2010/027315 ; US 2011/0278908 and EP 2514918 .
  • a first general type comprises a nose portion attached at one end of an elongate shaft whilst a second type comprises a bit having an inner cavity that fits onto an end of an 'adaptor' that comprises a projection head and an elongate shaft, with the head received within the inner cavity of the bit and the shank secured at a through bore extending within a mount body.
  • the angle by which the bit strikes the rock is referred to as the 'attack angle' and is an important cutting parameter.
  • Super hard pick materials such as diamond composites, exhibit enhanced wear resistance and are ideal for certain rock types. However due to their brittleness, a larger attack angle of 55 to 60° is preferred in contrast to a more conventional range being 40 to 50°.
  • Conventional pick holders or mounts fix the pick at a predetermined attack angle and it is currently not possible for an operator to conveniently change the attack angle to take advantage of the different pick materials that are available to best suit particular cutting applications and rock or mineral types.
  • a pick retaining assembly in which a pick is releasably mounted at an adaptor, having a shaft-like configuration that, is in turn, releasably mounted at a pick holder.
  • the adaptor is configured with a pick mounting projection at one end of a shaft that is orientated at a predetermined transverse angle relative to a longitudinal axis of the shaft.
  • Such an arrangement is effective to mount the pick at a tilted orientation representing a predetermined attack angle.
  • the adaptor may be releasably retained at the holder via a conventional retainer optionally in the form of a releasably clip, ring or bolt engageable with the shaft and pick holder.
  • the pick may be releasably engaged at the male projection by a corresponding retainer to provide a releasable couple between the projection and the bit.
  • a cutting bit retaining assembly for mounting a cutting bit at a cutting machine, the assembly comprising: a holder body having a bore extending in a direction between a forward and a rearward end of the body, an end surface positioned at an entrance of the bore; an elongate bit shaft having a central longitudinal axis and configured to extend axially into the bore to mount the shaft at the holder body; the shaft terminated at one end by a male projection configured to be received within a female cavity formed within a cutting bit attachable to the shaft; a shoulder projecting radially outward from the shaft at an axial junction of the male projection and a first end of the shaft, an underside surface of the shoulder configured to mate in touching or near touching contact with the end surface to support mounting of the shaft at the holder body; characterised in that: a central longitudinal axis of the male projection is aligned transverse to the longitudinal axis of the shaft such that the male projection is fixed at a generally tilted
  • the bit is rotatably mounted at the projection whilst the adaptor (comprising the elongate shaft and male projection) is non-rotatably mounted at the holder body so as to maintain the predetermined attack angle of the bit when mounted at the adaptor.
  • the subject invention may also comprise a set or kit of parts comprising a plurality of adaptors having respective shoulders of different configurations so as to provide respective male projections that are inclined or tilted relative to the longitudinal axis of the shaft at different respective angles. Such an arrangement is advantageous to allow a user to conveniently interchange different adaptors at the holder body to obtain the desired bit attack angle in use.
  • the shoulder is configured as a wedge having an axially thicker part relative to an axially thinner part, the underside surface provided at an underside of the wedge.
  • the respective parts represent circumferential regions of the shoulder around the central axis.
  • the relative axial thickness of the shoulder in a circumferential direction around the axis changes according to a smooth seamless transition so as to provide an uninterrupted annular surface for supporting contact with the rearward surface of the bit and the axially forward surface of the holder body.
  • the shoulder comprises a forward facing surface to mate with a rearward facing surface of the bit.
  • the angle by which the longitudinal axis of the male projection is transverse to the longitudinal axis of the shaft is in a range 1 to 60°; 1 to 40°; 1 to 30°; 2 to 20°; and more preferably 5 to 15°.
  • Such an arrangement is effective to provide the desired range of different attack angle settings available by interchanging different adaptors at the holder body, with each adaptor having a different respective tilt angle.
  • the shaft or the shoulder further comprises a first locking member and the holder body comprises a second locking member, the first and second members configured to engage and prevent the shaft rotating within the bore.
  • the first member comprises a male abutment projecting radially from the shaft or axially from the shoulder and the second member comprises a recess to at least partially receive the first member.
  • Interlocking lug and groove arrangements are a convenient means of rotatably locking the adaptor at the holder body to prevent undesirable rotation.
  • the adaptor and holder body may comprise a plurality of lug and recess mating components distributed and spaced apart circumferentially around the central axis of the shaft. Additionally, respective locking components may be provided at different axial positions of the adaptor and holder body including for example axially forward, axially mid and axially rearward positions relative to the forward mounted bit.
  • the shoulder is formed integrally with the shaft.
  • Such an arrangement is advantageous to provide a reliable and strong adaptor effective to reliably transmit the loading forces from the bit to the holder body and to reduce the creation of stress concentrations.
  • an axially rearward region of the male projection comprises a concave or tapered annular surface extending axially forward from the shoulder to mate in close touching contact with a convex or tapered surface within the cavity of the bit. Accordingly, the loading forces are transmitted evenly and effectively from the bit to the adaptor whilst allowing the bit to rotate on the adaptor.
  • the shaft comprises a length sufficient to extend axially through the bore such that a rearward second end of the shaft projects from the rearward end of holder body; and the assembly further comprises a retainer mountable at or towards the second end of the shaft to releasably retain the shaft at the holder body.
  • the adaptor may be axially locked at the holder body via a plurality of different mechanisms including for example threaded shaft and bolt arrangements; releasable clips; hole and pin or lug and groove arrangements and locking collar or ring arrangements as will be appreciated by those skilled in the art.
  • an axial length of the male projection is substantially in a range 1/4 to 1/2 of an axial length of the shaft that extends rearwardly from the shoulder.
  • a cutting bit assembly for mounting at a cutting machine comprising: a retaining assembly as claimed herein; and a cutting bit having a cutting tip at first end and a cavity projecting inwardly from a second end, the bit releasably mounted at the shaft via mating of the male projection within the cavity.
  • the shoulder is annular to provide an annular underside surface.
  • the shoulder comprises an axial length sufficient to axially separate and provide a spatial gap between the second end of the bit and the forward end of the holder body.
  • the spatial gap is sufficient to provide non-touching contact between the bit and the holder body to ensure loading forces are transmitted from the bit to the holder body exclusively via the adaptor.
  • the minimum axial length of the shoulder is therefore configured to avoid touching contact between the bit and the holder body over the entire tilt-angle range of the male projection.
  • the axial separation distance between the rearwardmost part of the bit and a respective forwardmost part of the holder body may vary for different adaptors having different projection tilt angles.
  • a cutting bit assembly 100 is adapted for mounting at an external surface of a rotatable cutting head (or drum) of a cutting machine (not shown).
  • the assembly 100 comprises a cutting bit 101 releasably and rotatably mounted at a cutting bit holder 103 via an elongate adaptor 102 that is, in turn, releasably mounted at bit holder body 103.
  • Bit 101 comprises a generally conical shape profile having a forward end 104 that mounts a cutting tip 106 and rearward end 105 mounted at a forward end 107 of holder body 103.
  • Holder body 103 is mounted at the cutting head (or drum) via a mounting flange 109 projecting laterally from one side of holder body 103.
  • a shoulder 110 projects radially outward from adaptor 102 and comprises a generally wedge shaped configuration.
  • Shoulder 110 comprises a forward facing annular surface 111 positioned in contact with bit rearward end 105 and a rearward facing annular surface 112 positioned in contact with an annular surface 113 at holder body forward end 107. Accordingly, shoulder 110 is configured to axially separate bit 101 from holder body 103 so that these two components are spaced apart in non-touching contact. Additionally, bit 101 via the wedge configuration of shoulder 110 is mounted at a tilted transverse angle relative to adaptor 102 so as to provide a desired attack angle when bit 101 is brought into contact with rock.
  • adaptor 102 comprises an elongate shaft 220 that extends axially rearward from shoulder 110 and in particular rearward facing surface 112.
  • Shaft 220 is terminated at a first end by a male projection indicated generally by reference 202.
  • Projection 202 comprises a substantially circular end face 210 and has a main body that flares radially outward via an external concave surface 206 that terminates at its rearwardmost end via an axially short cylindrical surface 208 that extends axially forward from annular forward facing surface 111.
  • a second end 212 of shaft 220 projects axially rearward from a rearward end 108 of holder body 103 with shaft 220 accommodated within a through bore 218 extending axially through holder body 103 between the forward and rearward ends 107, 108.
  • An annular groove 217 is indented at shaft second end 212 to receive a retaining clip (not shown) or the like to axially lock adaptor 102 at holder body 103.
  • shaft 220 comprises an annular channel 216 positioned substantially axially mid-way between shoulder 110 and second end 212 to partially accommodate and engage with an attachment ring 215 sandwiched between shaft 220 and the internal surface that defines bore 218.
  • Bit 101 comprises an internal cavity indicated generally by reference 201 that extends axially inward from rearward end 105.
  • Cavity 201 is shaped and dimensioned to receive projection 202 in generally close fitting contact such that bit 101 may be conveniently mounted and dismounted from adaptor 102 via the coupling between projection 202 and cavity 201.
  • bit 101 is rotatably mounted at projection 202 via an intermediate coupling ring 204 housed within cavity 201 and positioned radially between projection 202 and an internal facing surface 207 of cavity 201.
  • an annular channel 203 is indented radially into bit 101 from cavity surface 207 to at least partially accommodate ring 204.
  • a corresponding channel 205 is indented within projection 202 to at least partially receive an opposite face of ring 204 such that ring 204 is accommodated within and between the respective channels 203, 205 to releasably retain bit 101 at adaptor 102.
  • Cavity surface 207 at the region of the cavity opening (extending axially inward from rearward end 105) comprises a convex curvature so as to mate in close touching contact with the concave external surface of projection 202 at the position immediately axially forward of shoulder 110.
  • Shoulder 110 comprises an annular configuration with forward and rearward annular surfaces 111, 112 positioned in close touching engagement contact with the respective rearward annular surface 200 at bit rearward end 105 and adaptor body annular surface 113.
  • the respective shoulder abutment surfaces 111, 112 are aligned transverse to one another and are separated by a cylindrical surface 219.
  • shoulder 110 is wedge shaped it comprises an axial thickness that is non-uniform in a circumferential direction around longitudinal axis 211 about which shoulder 110 is centred such that surface 219 extends in the axial direction but is aligned transverse to axis 211.
  • a circumferential segment 214 of shoulder 110 is axially thicker than a corresponding circumferential segment 213.
  • a length of cylindrical surface 219 (in the generally axial direction) is greater at the thicker segment 214 than the thinner segment 213. Additionally, and according to the specific implementation, a radial separation of cylindrical surface 219 from axis 211 at thicker segment 214 is greater than the corresponding radial separation of surface 219 from axis 211 at thinner segment 213.
  • This wedge configuration of shoulder 110 provides an effective angled seat for bit 101 such that the central axis 209 of bit 101 is aligned transverse to shaft axis 211 via a tilt angle ⁇ .
  • Axis 209 also corresponds to the central axis of projection 202 being received centrally within cavity 201. According to the specific implementation, the tilt angle by which projection 202 and bit 101 extend relative to axis 211 is in the range 8° to 12°.
  • adaptor 102 is rotatably locked at holder body 103 via a rotational locking mechanism.
  • the locking mechanism comprises a male abutment 301 that projects radially outward from shaft 220 immediately rearward of shoulder 110 and in particular rearward facing shoulder surface 112.
  • abutment 301 is formed as a lug provided at the forward end of shaft 220.
  • a corresponding recess 300 is formed within a mouth 302 of bore 218 being shaped and dimensioned to accommodate abutment lug 301 and in turn rotationally lock adaptor 102 at holder body 103.
  • shaft 220 is prevented from rotation about axis 211 within bore 218 via mating abutment contact between lug 301 and recess 300.
  • Figure 4 illustrates an alternative embodiment in which a lug or axial projection 401 extends rearwardly from shoulder rearward facing surface 112.
  • Lug 401 is formed as a truncated cylinder and is radially separated from shaft 220.
  • holder body 103 comprises a corresponding substantially cylindrical shaped recess 400 indented in forward facing annular surface 113 being radially separated from bore mouth 302. Accordingly, when adaptor 102 is mounted at holder body 103, lug 401 engages into recess 400 to rotationally lock shaft 220 within bore 218.

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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)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
EP14175520.7A 2014-07-03 2014-07-03 Schneidmeißelhalterung mit verstellbarem Winkel Withdrawn EP2963237A1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP14175520.7A EP2963237A1 (de) 2014-07-03 2014-07-03 Schneidmeißelhalterung mit verstellbarem Winkel
AU2015203149A AU2015203149A1 (en) 2014-07-03 2015-06-12 Variable angle cutting bit retaining assembly
US14/790,618 US20160003041A1 (en) 2014-07-03 2015-07-02 Variable Angle Cutting Bit Retaining Assembly
CN201510423883.1A CN105240010A (zh) 2014-07-03 2015-07-03 可变角度的切削头保持组件

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14175520.7A EP2963237A1 (de) 2014-07-03 2014-07-03 Schneidmeißelhalterung mit verstellbarem Winkel

Publications (1)

Publication Number Publication Date
EP2963237A1 true EP2963237A1 (de) 2016-01-06

Family

ID=51176126

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14175520.7A Withdrawn EP2963237A1 (de) 2014-07-03 2014-07-03 Schneidmeißelhalterung mit verstellbarem Winkel

Country Status (4)

Country Link
US (1) US20160003041A1 (de)
EP (1) EP2963237A1 (de)
CN (1) CN105240010A (de)
AU (1) AU2015203149A1 (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD778967S1 (en) * 2015-06-26 2017-02-14 Pengo Corporation Step shank tooth holder
WO2020109207A1 (en) * 2018-11-27 2020-06-04 Element Six Gmbh Pick tool for road milling
JP7357892B2 (ja) * 2018-12-27 2023-10-10 三星ダイヤモンド工業株式会社 ホルダジョイント、ホルダユニット、およびスクライブ装置
GB201901712D0 (en) * 2019-02-07 2019-03-27 Element Six Gmbh Pick tool for road milling
AU2020265894B2 (en) * 2019-04-30 2022-01-06 Idim Pty Ltd Tool holder assembly
US11633259B2 (en) * 2019-08-15 2023-04-25 MDT Micro Diamond Technologies Ltd. Handpiece adapter for an endodontic file
KR102158269B1 (ko) * 2019-10-16 2020-09-21 황일규 노면파쇄기의 비트 유닛
DE102021112757A1 (de) * 2021-05-17 2022-11-17 Bomag Gmbh WECHSELHALTER, MEIßELWECHSELHALTERSYSTEM, FRÄSWALZE FÜR EINE STRAßENFRÄSMASCHINE UND STRAßENFRÄSMASCHINE

Citations (16)

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Publication number Priority date Publication date Assignee Title
US3342531A (en) 1965-02-16 1967-09-19 Cincinnati Mine Machinery Co Conical cutter bits held by resilient retainer for free rotation
US3627381A (en) 1970-01-14 1971-12-14 Cincinnati Mine Machinery Co Mounting means for cutter bits
US3932952A (en) 1973-12-17 1976-01-20 Caterpillar Tractor Co. Multi-material ripper tip
US4343516A (en) 1980-08-11 1982-08-10 Ingersoll-Rand Company Cutter bit assembly
US5261499A (en) 1992-07-15 1993-11-16 Kennametal Inc. Two-piece rotatable cutting bit
WO1996031682A1 (en) 1995-04-06 1996-10-10 Kennametal South Africa (Proprietary) Limited Pick holder extraction
US5799741A (en) 1996-02-26 1998-09-01 Champion Equipment Corp. Method of cutting and a cutting rotative bit
WO1998039553A1 (en) 1997-03-05 1998-09-11 Bingham Engineering Limited Pick holder and pick box assembly
EP1033216A1 (de) * 1999-03-03 2000-09-06 BITELLI S.p.A. Werkzeughalter für eine Frästrommel zur Erdbearbeitung
EP1069278A1 (de) * 1999-07-12 2001-01-17 Bauer Spezialtiefbau GmbH Bohrzahn zur Erdbearbeitung
US20080258536A1 (en) 2006-08-11 2008-10-23 Hall David R High-impact Resistant Tool
US20080309148A1 (en) 2006-08-11 2008-12-18 Hall David R Degradation Assembly Shield
WO2010027315A1 (en) 2008-09-05 2010-03-11 Sandvik Intellectual Property Ab Tool pick with channeled shaft end
DE102009052351A1 (de) * 2009-11-07 2011-05-12 Michael Steinbrecher Fräswalze
US20110278908A1 (en) 2010-05-13 2011-11-17 Gregory Rockhouse Ranch, Inc. Method and system of retaining a cutting bit
EP2514918A1 (de) 2011-04-20 2012-10-24 Sandvik Intellectual Property AB Fräser und Fräserhalter

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US4346934A (en) * 1977-06-29 1982-08-31 Kennametal Inc. Excavating bit
US4302055A (en) * 1978-02-27 1981-11-24 Sandvik Aktiebolag Wedgingly mounted tool holder or adapter for a cutting head
US8136887B2 (en) * 2006-08-11 2012-03-20 Schlumberger Technology Corporation Non-rotating pick with a pressed in carbide segment
US8534766B2 (en) * 2008-04-22 2013-09-17 Kennametal Inc. Indexable cutting tool system
US20150035344A1 (en) * 2013-07-31 2015-02-05 David R. Hall Pick Tool with a Removable Shank
EP2851507B1 (de) * 2013-09-19 2020-06-17 Sandvik Intellectual Property AB Fräser und fräserbaugruppe

Patent Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3342531A (en) 1965-02-16 1967-09-19 Cincinnati Mine Machinery Co Conical cutter bits held by resilient retainer for free rotation
US3627381A (en) 1970-01-14 1971-12-14 Cincinnati Mine Machinery Co Mounting means for cutter bits
US3932952A (en) 1973-12-17 1976-01-20 Caterpillar Tractor Co. Multi-material ripper tip
US4343516A (en) 1980-08-11 1982-08-10 Ingersoll-Rand Company Cutter bit assembly
US5261499A (en) 1992-07-15 1993-11-16 Kennametal Inc. Two-piece rotatable cutting bit
WO1996031682A1 (en) 1995-04-06 1996-10-10 Kennametal South Africa (Proprietary) Limited Pick holder extraction
US5799741A (en) 1996-02-26 1998-09-01 Champion Equipment Corp. Method of cutting and a cutting rotative bit
WO1998039553A1 (en) 1997-03-05 1998-09-11 Bingham Engineering Limited Pick holder and pick box assembly
EP1033216A1 (de) * 1999-03-03 2000-09-06 BITELLI S.p.A. Werkzeughalter für eine Frästrommel zur Erdbearbeitung
EP1069278A1 (de) * 1999-07-12 2001-01-17 Bauer Spezialtiefbau GmbH Bohrzahn zur Erdbearbeitung
US20080258536A1 (en) 2006-08-11 2008-10-23 Hall David R High-impact Resistant Tool
US20080309148A1 (en) 2006-08-11 2008-12-18 Hall David R Degradation Assembly Shield
WO2010027315A1 (en) 2008-09-05 2010-03-11 Sandvik Intellectual Property Ab Tool pick with channeled shaft end
DE102009052351A1 (de) * 2009-11-07 2011-05-12 Michael Steinbrecher Fräswalze
US20110278908A1 (en) 2010-05-13 2011-11-17 Gregory Rockhouse Ranch, Inc. Method and system of retaining a cutting bit
EP2514918A1 (de) 2011-04-20 2012-10-24 Sandvik Intellectual Property AB Fräser und Fräserhalter

Also Published As

Publication number Publication date
CN105240010A (zh) 2016-01-13
US20160003041A1 (en) 2016-01-07
AU2015203149A1 (en) 2016-01-21

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