EP0819208A1 - Pick holder extraction - Google Patents
Pick holder extractionInfo
- Publication number
- EP0819208A1 EP0819208A1 EP96909909A EP96909909A EP0819208A1 EP 0819208 A1 EP0819208 A1 EP 0819208A1 EP 96909909 A EP96909909 A EP 96909909A EP 96909909 A EP96909909 A EP 96909909A EP 0819208 A1 EP0819208 A1 EP 0819208A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- shank
- pick
- pick holder
- 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.)
- Granted
Links
- 238000000605 extraction Methods 0.000 title claims description 53
- 230000015572 biosynthetic process Effects 0.000 claims description 29
- 238000005755 formation reaction Methods 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 23
- 238000004140 cleaning Methods 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 238000004873 anchoring Methods 0.000 description 2
- 230000000916 dilatatory effect Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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; to extraction means for carrying out the method of the invention, to a pick holder, and to an extraction tool.
- a continuous miner for example a continuous miner manufactured by the firm Voe ⁇ t Alpine
- a plurality of pick boxes arranged in predetermined fashion on a drum of the continuous miner.
- 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. It is an object of this invention to provide a method, an extracting means, a pick holder and an extraction tool which improve on the prior art and which do not suffer, or at least suffer to a smaller degree, from the problems of the prior art.
- a method of extracting a pick holder from a pick box of a continuous miner drum 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 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.
- 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 centring the shank of the extraction tool relative to the pick holder when applying the extraction force.
- Centring 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 invention extends in accordance with a second aspect to extraction means suitable for use in extracting a pick holder from a pick box of a continuous miner drum, 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 formations 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 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.
- the invention extends in accordance with a third aspect to a pick holder suitable for receipt in a pick box of a continuous miner, the pick holder including an internal rotary fastening formation in a bore thereof.
- the invention extends yet further in accordance with a fourth aspect to an extraction tool suitable for use in extracting a pick holder having an internal rotary fastening formation in a bore thereof from a pick box of a continuous miner, the extraction tool having a shank and, toward one end of the shank, an external rotary fastening formation, and, toward an opposed end of the shank, engagement means for applying an extraction force to the shank.
- Figure 1 shows, in side view, a prior art embodiment of a pick holder of the general kind to which this invention relates;
- Figure 2 shows, in a view corresponding to that of Figure 1 , a pick holder in accordance with this invention.
- Figure 3 shows, schematically, in part sectional side view, extraction of a pick holder from a pick box in accordance with this invention .
- 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. As described above, this method has the same disadvantages as the method used with the internal peripheral groove
- 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 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 a 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)
- Transmission Devices (AREA)
- Details Of Rigid Or Semi-Rigid Containers (AREA)
- Portable Power Tools In General (AREA)
Abstract
Description
Claims
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 true EP0819208A1 (en) | 1998-01-21 |
EP0819208B1 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 (en) |
CN (1) | CN1053946C (en) |
AU (1) | AU716518B2 (en) |
CA (1) | CA2217500A1 (en) |
DE (1) | DE69621921T2 (en) |
RU (1) | RU2152516C2 (en) |
WO (1) | WO1996031682A1 (en) |
ZA (1) | ZA962371B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2514918A1 (en) * | 2011-04-20 | 2012-10-24 | Sandvik Intellectual Property AB | Cutting bit and bit holder |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE29710357U1 (en) * | 1997-06-13 | 1997-09-04 | Komotzki Michael | Chisel holder with abutment for an extraction tool |
CN102074663B (en) * | 2010-12-31 | 2013-03-20 | 东莞市龙行航空科技有限公司 | Conveniently-extracted battery |
PL2851507T3 (en) | 2013-09-19 | 2020-11-02 | Sandvik Intellectual Property Ab | Cutting bit and bit assembly |
EP2963237A1 (en) | 2014-07-03 | 2016-01-06 | Sandvik Intellectual Property AB | Variable angle cutting bit retaining assembly |
GB2582863B (en) | 2014-09-15 | 2021-02-24 | Joy Global Underground Mining Llc | Service tool for cutting bit assembly |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU515763B2 (en) * | 1977-04-01 | 1981-04-30 | Hall & Pickles Limited | Mineral cutting pick |
FR2438739A3 (en) * | 1978-08-24 | 1980-05-09 | Krummenauer Kg H | Tunnel borer tool holder - has flexible bar engaging tangentially in annular groove in tail of tool |
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 (en) * | 1986-09-23 | 1986-11-06 | Geisert Bergtechnik GmbH, 6601 Bübingen | Chisel of a cutting head of a mining machine or jacking machine |
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 (en) * | 2009-01-08 | 2010-07-15 | Robert Bosch Gmbh | Tool device with a spindle driven by a drive device |
-
1996
- 1996-03-25 ZA ZA962371A patent/ZA962371B/en unknown
- 1996-04-03 RU RU97118424/03A patent/RU2152516C2/en not_active IP Right Cessation
- 1996-04-03 CN CN96193892A patent/CN1053946C/en not_active Expired - Fee Related
- 1996-04-03 CA CA002217500A patent/CA2217500A1/en not_active Abandoned
- 1996-04-03 WO PCT/US1996/004532 patent/WO1996031682A1/en active IP Right Grant
- 1996-04-03 AU AU53268/96A patent/AU716518B2/en not_active Ceased
- 1996-04-03 DE DE69621921T patent/DE69621921T2/en not_active Expired - Lifetime
- 1996-04-03 EP EP96909909A patent/EP0819208B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9631682A1 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2514918A1 (en) * | 2011-04-20 | 2012-10-24 | Sandvik Intellectual Property AB | Cutting bit and bit holder |
WO2012143153A3 (en) * | 2011-04-20 | 2013-04-04 | Sandvik Intellectual Property Ab | Cutting bit and bit holder |
US8960810B2 (en) | 2011-04-20 | 2015-02-24 | Sandvik Intellectual Property Ab | Cutting bit and bit holder |
Also Published As
Publication number | Publication date |
---|---|
AU5326896A (en) | 1996-10-23 |
WO1996031682A1 (en) | 1996-10-10 |
EP0819208B1 (en) | 2002-06-19 |
CN1053946C (en) | 2000-06-28 |
DE69621921D1 (en) | 2002-07-25 |
RU2152516C2 (en) | 2000-07-10 |
DE69621921T2 (en) | 2003-01-09 |
AU716518B2 (en) | 2000-02-24 |
CA2217500A1 (en) | 1996-10-10 |
ZA962371B (en) | 1996-06-26 |
CN1185192A (en) | 1998-06-17 |
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