EP0819208B1 - Pick holder extraction - Google Patents

Pick holder extraction Download PDF

Info

Publication number
EP0819208B1
EP0819208B1 EP96909909A EP96909909A EP0819208B1 EP 0819208 B1 EP0819208 B1 EP 0819208B1 EP 96909909 A EP96909909 A EP 96909909A EP 96909909 A EP96909909 A EP 96909909A EP 0819208 B1 EP0819208 B1 EP 0819208B1
Authority
EP
European Patent Office
Prior art keywords
shank
pick holder
pick
bore
extraction
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.)
Expired - Lifetime
Application number
EP96909909A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0819208A1 (en
Inventor
Noel G. Wright
Richard George Holtshausen
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.)
Kennametal South Africa Pty Ltd
Original Assignee
Kennametal South Africa Pty Ltd
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 Kennametal South Africa Pty Ltd filed Critical Kennametal South Africa Pty Ltd
Publication of EP0819208A1 publication Critical patent/EP0819208A1/en
Application granted granted Critical
Publication of EP0819208B1 publication Critical patent/EP0819208B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • E21C35/188—Mining picks; Holders therefor characterised by adaptations to use an extraction tool
    • 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

  • THIS INVENTION relates to extracting a pick holder from a pick box in a continuous miner drum; and to extraction means for carrying out the method of the invention.
  • each pick box has a substantially blind socket within which a pick holder is replaceably received.
  • a shank of a pick is in turn replaceably received within the pick holder such as to allow rotation of the pick relative to the pick holder in use. Receipt of the pick holder in the pick box is by means of a tight, frictional, press fit.
  • the pick holder is to be removable to allow replacement, reconditioning, and the like.
  • an internal circumferential groove to retain a pick in use via a retaining ring on a shank of the pick.
  • One way to remove the pick holder from the pick box (when the pick has been removed), is by dilating a collar on a shank of an extracting tool to locate in said internal circumferential groove and to apply an extraction force on the shank. The force is then transmitted via a shoulder of the internal circumferential groove to extract the pick holder from the pick box.
  • An alternative, known, method is to provide an external circumferential groove in a portion of the outer surface of the pick holder which protrudes from the pick box.
  • This method has generally the same disadvantages as the first mentioned known method.
  • the external circumferential groove is exposed to the working conditions and becomes worn and unusable for locating purposes fairly quickly.
  • the protruding portion or head may shear off, which renders extraction by means of the external groove impossible.
  • GB- A-2 072 241 discloses a pick box body having a bore adapted to receive the shank of a pick; the bore is grooved for an enhanced latching effect on the shank.
  • a method of extracting a pick holder, from a pick box of a continuous miner drum, said pick holder being internally grooved characterized by the method including providing an internal rotary fastening formation in a bore of the pick holder, providing a complemental external rotary fastening formation on a shank of an extraction tool, interengaging the complemental internal and external rotary fastening formations by relative rotation between the pick holder and the extraction tool and applying an extraction force to the pick holder via the shank and via the engaged rotary fastening formations.
  • extraction means suitable for use in extracting, a pick holder from a pick box of a continuous miner drum, said pick holder being internally grooved, characterized by the extraction means including, in combination an internal rotary fastening formation in a bore of the pick holder; and a complemental external rotary fastening formation on a shank of an extraction tool, the shank being receivable in the bore of the pick holder and the complemental rotary fastening formation being interengagable by relative rotation to allow an extraction force to be applied to the pick holder via the extraction tool and the interengaged rotary fastening formations in use.
  • the rotary fastening formations may be screw threads and interengaging the complemental rotary fastening formations may be by screwing them together. In other methods, mere twisting or pivoting may be required.
  • the method may include centering the shank of the extraction tool relative to the pick holder when applying the extraction force. Centering may be effected by supporting the shank in the mouth or bore of the pick holder with little clearance. Supporting the shank in the mouth or bore may be via a sleeve received over the shank and fitting into the mouth or bore with little clearance, or by appropriate selection of the diameter of the shank.
  • the rotary fastening formations may be in the form of screw threads which are screw threadingly interengagable.
  • other kinds of rotary fastening formations requiring mere twisting or pivoting e.g. a bayonet-type connector may be provided.
  • the internal screw thread may conveniently be positioned axially remote from a mouth of the pick holder spaced behind an internal circumferential groove provided for anchoring a pick in the pick holder.
  • the internal screw thread may be of a diameter such that an outer or major diameter of the complemental screw thread on the shank is smaller than the bore of the pick holder.
  • the external screw thread on the shank may have a leading thread in the form of a cleaning or opening thread, tap fashion, to clean up the internal screw thread.
  • the leading thread may be sharp or knife edged.
  • the external screw thread may have at least one longitudinal groove or passage to pass matter which has been cleared from the internal screw thread.
  • the extraction means may further comprise a collar or sleeve which is replaceably received around the shank and which is of an outer diameter allowing it to enter the bore of the pick holder with little clearance so as to support the shank in the bore with little clearance.
  • a prior art or known pick holder of the general kind to which this invention relates is generally indicated by reference numeral 10. It comprises a round cylindrical outer surface 12 which is machined to a close tolerance to allow the pick holder 10 to be frictionally received, by means of a press fit, within a complemental bore of a pick box.
  • the pick holder 10 has a concentric inner bore 14 of a size slidingly to pass a shank of a pick.
  • the inner bore 14 is open at a mouth 16 at a front of the pick holder 10.
  • the bore 14 opens up in a rearward portion of the pick holder 10 in the form of a diverging passage 26 running out in a rear end 24 of the pick holder 10.
  • an internal peripheral groove 18 within which an expandable locating ring of the pick is received to locate the pick axially within the pick holder 10 and to allow free rotation of the pick relative to the pick holder 10.
  • the pick holder 10 can be extracted from the pick box by passing a shank of an extraction tool into the inner bore 14, dilating a dilatable collar to seat in the internal peripheral groove 18 and by applying an extraction force on the shank.
  • a fore portion of the pick holder 10 projects in use from the pick box.
  • An outer circumferential groove 22 is provided in such protruding portion 20.
  • An alternative method of extracting the pick holder 10 from the pick box is to provide a contractible jaw which is contracted to seat in the outer circumferential groove 22. An extraction force can then be applied via the jaw to the pick holder 10 to extract it from the pick box.
  • this method 5 has the same disadvantages as the method used with the internal peripheral groove 18.
  • the external extraction method further has the disadvantage that the outer circumferential groove 22 is exposed to working conditions of the pick and thus quickly becomes worn to an extent in which it is unusable for extraction purposes.
  • a pick holder in accordance with this invention is generally indicated by reference numeral 110.
  • it is similar to the pick holder 10 of Figure 1 and similar features and components are not again described. Those features and components are numbered using like reference numerals. Emphasis will herein be placed on the differences of 5 the pick holder 110 over he pick holder 10.
  • the pick holder 110 does not require an outer circumferential groove in its protruding portion 120. It can, however, be provided with such a groove to allow an operator the option of extracting it from a pick box by the known method.
  • an internal screw thread 30 is provided in the internal bore 114 at position spaced behind the internal circumferential groove 118.
  • the screw thread 30 is provided such that a major root thereof is not larger than the nominal diameter of the inner bore 114.
  • the screw thread 30 is conveniently of saw-tooth shape.
  • FIG. 3 where an extraction device is generally indicated by reference numeral 50 in operative condition to extract the pick holder 110 from a pick box 40. It is emphasised that, especially Figure 3, is schematic to illustrate the principle of the invention.
  • the extraction device 50 has a centre shank 52 having, at one end, a screw thread 54 complemental to the screw thread 30 of the pick holder 110. Furthermore, the diameter of the shank 52 is selected such that it is snugly, slidingly received in the inner bore 114 of the pick holder 110. As described above, the screw thread 30 projects inwardly thus allowing the screw thread 54 to interengage the screw thread 30 and yet be able to enter the inner bore 114. If desired, one thread of the screw thread 54, advantageously the screw thread which will be a leading screw thread in use, may be a cleaning screw thread, tap-fashion.
  • the shank At an end of the shank remote from the screw thread 54, it has a screw thread 56 for a locating or anchoring nut 58.
  • the extraction device 50 further comprises an annular hydraulic jack means 60 and a bush 62 arranged in series around the shank 52.
  • An outer end of the hydraulic jacking means 60 abuts the nut 58 and an opposed end of the bush 62 abuts a nose 44 of the pick box 40.
  • the bush 62 fits snugly around the protruding portion 120 of the pick holder 110.
  • Extension of the hydraulic means 60 imparts an extraction force on the shank 52 which is transmitted via the interengaging screw threads 54, 30 to the pick holder 110 to extract it from the pick box 40.
  • the screw threads 30, 54 are conveniently of a relative course kind and may be of rounded or saw-tooth cross-section.
  • the method and extraction means in accordance with the invention are of high integrity which would not slip or otherwise fail unless under most extreme circumstances.
  • the extraction means is of simple construction thus allowing it to be manufactured at relatively low expense and with a high degree of integrity.

Landscapes

  • 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)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
  • Details Of Rigid Or Semi-Rigid Containers (AREA)
  • Transmission Devices (AREA)
  • Portable Power Tools In General (AREA)
EP96909909A 1995-04-06 1996-04-03 Pick holder extraction Expired - Lifetime EP0819208B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ZA952855 1995-04-06
ZA9502855 1995-04-06
PCT/US1996/004532 WO1996031682A1 (en) 1995-04-06 1996-04-03 Pick holder extraction

Publications (2)

Publication Number Publication Date
EP0819208A1 EP0819208A1 (en) 1998-01-21
EP0819208B1 true EP0819208B1 (en) 2002-06-19

Family

ID=25584984

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96909909A Expired - Lifetime EP0819208B1 (en) 1995-04-06 1996-04-03 Pick holder extraction

Country Status (8)

Country Link
EP (1) EP0819208B1 (xx)
CN (1) CN1053946C (xx)
AU (1) AU716518B2 (xx)
CA (1) CA2217500A1 (xx)
DE (1) DE69621921T2 (xx)
RU (1) RU2152516C2 (xx)
WO (1) WO1996031682A1 (xx)
ZA (1) ZA962371B (xx)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29710357U1 (de) * 1997-06-13 1997-09-04 Komotzki, Michael, 44319 Dortmund Meißelhalter mit Widerlager für ein Ausziehwerkzeug
CN102074663B (zh) * 2010-12-31 2013-03-20 东莞市龙行航空科技有限公司 一种方便提取的电池
EP2514918B1 (en) * 2011-04-20 2015-07-29 Sandvik Intellectual Property AB Cutting bit and bit holder
PL2851507T3 (pl) 2013-09-19 2020-11-02 Sandvik Intellectual Property Ab Wkładka tnąca i zespół wkładki
EP2963237A1 (en) 2014-07-03 2016-01-06 Sandvik Intellectual Property AB Variable angle cutting bit retaining assembly
CN110486011B (zh) 2014-09-15 2021-05-07 久益环球地下采矿有限责任公司 用于钻头组件的维修工具

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU515763B2 (en) * 1977-04-01 1981-04-30 Hall & Pickles Limited Mineral cutting pick
FR2438739A3 (fr) * 1978-08-24 1980-05-09 Krummenauer Kg H Porte-trepan et trepan de haveuse
JPS56112355A (en) * 1980-02-09 1981-09-04 Toyota Motor Corp Brake booster
GB2072241B (en) * 1980-03-07 1983-07-06 Hall & Picles Ltd Pick box
GB8333339D0 (en) * 1983-12-14 1984-01-18 Hall & Pickles Ltd Mineral cutter pick and box
DE8625406U1 (de) * 1986-09-23 1986-11-06 Geisert Bergtechnik GmbH, 6601 Bübingen Meißel eines Schneidkopfes einer Gewinnungsmaschine oder Vortriebmaschine
US5067775A (en) * 1988-04-21 1991-11-26 Kennametal Inc. Retainer for rotatable bits
US5106166A (en) * 1990-09-07 1992-04-21 Joy Technologies Inc. Cutting bit holding apparatus
US5374111A (en) * 1993-04-26 1994-12-20 Kennametal Inc. Extraction undercut for flanged bits
GB9400114D0 (en) * 1994-01-05 1994-03-02 Minnovation Ltd Mineral pick box
DE102009000065A1 (de) * 2009-01-08 2010-07-15 Robert Bosch Gmbh Werkzeuggerät mit einer durch eine Antriebsvorrichtung angetriebenen Spindel

Also Published As

Publication number Publication date
EP0819208A1 (en) 1998-01-21
AU716518B2 (en) 2000-02-24
CN1053946C (zh) 2000-06-28
DE69621921T2 (de) 2003-01-09
CN1185192A (zh) 1998-06-17
RU2152516C2 (ru) 2000-07-10
DE69621921D1 (de) 2002-07-25
ZA962371B (en) 1996-06-26
WO1996031682A1 (en) 1996-10-10
AU5326896A (en) 1996-10-23
CA2217500A1 (en) 1996-10-10

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