WO1995027840A1 - Improvements in securing clips for coal and rock picks - Google Patents

Improvements in securing clips for coal and rock picks Download PDF

Info

Publication number
WO1995027840A1
WO1995027840A1 PCT/AU1995/000189 AU9500189W WO9527840A1 WO 1995027840 A1 WO1995027840 A1 WO 1995027840A1 AU 9500189 W AU9500189 W AU 9500189W WO 9527840 A1 WO9527840 A1 WO 9527840A1
Authority
WO
WIPO (PCT)
Prior art keywords
pick
holder
shank
clip
head
Prior art date
Application number
PCT/AU1995/000189
Other languages
French (fr)
Inventor
Kieron Denz
Allan D. Clair
Original Assignee
Cutincoal Pty. Limited
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 Cutincoal Pty. Limited filed Critical Cutincoal Pty. Limited
Priority to AU21320/95A priority Critical patent/AU2132095A/en
Publication of WO1995027840A1 publication Critical patent/WO1995027840A1/en

Links

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
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/28—Small metalwork for digging elements, e.g. teeth scraper bits
    • E02F9/2866—Small metalwork for digging elements, e.g. teeth scraper bits for rotating digging elements

Definitions

  • This invention relates to picks for use with mining machines and whilst not limited thereto is particularly applicable to picks used in coal mining operations.
  • the mining machines with which such picks are used include a cylindrical cutting head having spiral rows of picks mounted thereon.
  • the cutting head is rotatably driven from an appropriate power source and is brought into contact with a coal seam. As the head is rotated the picks cut coal from the seam which is subsequently removed by a conveyor and transport means.
  • the number of picks on a cutting head varies. A typical head would have any where from 100 to 300 picks mounted thereon.
  • Mining machines of the aforementioned type are well known in the mining industry and are generally referred to as continuous miners and long wall shearers.
  • the picks used in machines of the type described include a body or head having a pick point and a shank.
  • the shank has a circumferential groove or channel adjacent its end remote from the pick point which accommodates a securing clip whereby the pick is fixed in a holder in the cutter head.
  • a further circumferential groove or grooves are located on the head of the pick, the purpose of which will be explained hereafter.
  • the securing clip is made of spring steel and is of the split ring type. A number of dimples are pressed outwardly from the surface of the clip to effectively increase its overall thickness dimension.
  • the diameter of the clip has to be compressed so as to be accommodated wholly within the mentioned groove.
  • the clip expands to its original diameter and the dimples lock into a circumferential groove in the holder and so retain the pick therein.
  • Being of spring steel considerable force is required to cause the securing clip to be accommodated wholly within the groove in the shank and the mounting of the pick within the holder is effected by hammer blows. It sometimes happens that the securing clip is distorted or twisted during installation of the pick. This does not become apparent until mining operations are commenced. The result is the pick is not properly mounted in its holder and is quickly damaged and worn with consequential wear and damage to the holder itself.
  • the number of picks mounted in a cutter head vary in accordance with the type of head used. As previously stated the number varies from 100 to 300 picks and it is not uncommon to replace up to 75 worn, damaged or lost picks in a normal mining shift.
  • securing clips as presently used suffer from a number of disadvantages and there has been a need to provide a securing clip which will not be damaged during installation, which will not damage the holder in the cutting head, which will properly and securely retain the pick in its holder and which leads to ease of operation in the installation and removal of the pick from its holder.
  • the invention accordingly provides a novel securing clip for use with picks of the type referred to and which will overcome the problems associated with spring steel clips as currently used and which will retain the pick in its holder until its replacement becomes necessary and which will allow the pick to freely rotate in its holder throughout its working life.
  • a securing clip to retain a pick in its holder in a mining machine, said pick having a body or head with a pick point thereon and a shank extending from said body with a circumferential groove or channel adjacent the end of said shank, said clip comprising a cylindrical member formed of elastomeric material and of such dimension that it can be force fitted over said shank and accommodated in said channel, said cylindrical member having a smooth internal wall with a circumferential bead or flange on its outerwall intermediate its ends which is engageable in a circumferential groove in said pick holder to retain said pick in said holder.
  • Fig. 1 is a perspective view of a conventional coal pick with a spring steel securing clip positioned thereon;
  • Fig. 2 is a perspective view of the securing clip illustrated in Fig. 1 ;
  • Fig. 3 is a perspective view of a pick with a damaged spring steel clip;
  • Fig. 4 is a perspective view of a securing clip in accordance with the invention.
  • Fig. 5 is a perspective view of a securing clip in accordance with the invention fitted to a conventional pick.
  • the pick designated generally by the reference 1 includes a cone shaped body 2 provided with a pick point 3 and an extraction groove 4.
  • a shank 5 extends from the rear end of the head is provided with a circumferential groove 6 which accommodates a securing clip 7.
  • the securing clip is manufactured from spring steel. It is of the split-ring type as illustrated in Fig 2 and has a number of dimples 8 pressed outwardly therefrom which when the pick is mounted in a holder in the cutter head of a mining machine accommodated in a circumferential groove (not shown) therein.
  • Fig. 3 illustrates a conventional pick with a damaged spring steel clip 7. It will be noted that the clip has opened and the wall 9 has twisted and been forced over the rear end of the shank 5. This prevents rotation of the pick in its holder and makes it extremely difficult and dangerous to extract it.
  • the securing clip illustrated in Fig. 4 is made from plastic elastomeric material preferably polyurethane and comprises a sleeve 10 having a smooth internal wall 11 and an external circumferential flange or bead 12.
  • the inner diameter of the sleeve is such that it can be force fitted over the rear end of shank 5 and accommodated in groove 6.
  • the flange 12 when the pick is mounted in a holder in the cutter head of a mining machine being accommodated in a circumferential groove therein to retain the pick in said holder.

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)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)

Abstract

The pick (1) has a body or head with a pick point on the head (2) and a shank extends from the rear end of the body and has a circumferential groove adjacent the end of the shank (5). The securing clip (10) comprises a cylindrical member formed of elastomeric material which is adapted to be force fitted over the shank (5) and accommodated in the channel. The cylindrical member has a smaller internal wall and a circumferential bead or flange (12) on its outer wall intermediate its ends which is engageable in a circumferential groove in the pick holder to retain the pick therein.

Description

IMPROVEMENTS IN SECURING CLIPS FOR COAL AND ROCK PICKS
This invention relates to picks for use with mining machines and whilst not limited thereto is particularly applicable to picks used in coal mining operations.
The mining machines with which such picks are used include a cylindrical cutting head having spiral rows of picks mounted thereon. The cutting head is rotatably driven from an appropriate power source and is brought into contact with a coal seam. As the head is rotated the picks cut coal from the seam which is subsequently removed by a conveyor and transport means. The number of picks on a cutting head varies. A typical head would have any where from 100 to 300 picks mounted thereon. Mining machines of the aforementioned type are well known in the mining industry and are generally referred to as continuous miners and long wall shearers.
The picks used in machines of the type described include a body or head having a pick point and a shank. The shank has a circumferential groove or channel adjacent its end remote from the pick point which accommodates a securing clip whereby the pick is fixed in a holder in the cutter head.
A further circumferential groove or grooves are located on the head of the pick, the purpose of which will be explained hereafter.
The securing clip is made of spring steel and is of the split ring type. A number of dimples are pressed outwardly from the surface of the clip to effectively increase its overall thickness dimension.
In order to permit the pick to be secured in a holder in the cutter head the diameter of the clip has to be compressed so as to be accommodated wholly within the mentioned groove. Once in the holder the clip expands to its original diameter and the dimples lock into a circumferential groove in the holder and so retain the pick therein. Being of spring steel considerable force is required to cause the securing clip to be accommodated wholly within the groove in the shank and the mounting of the pick within the holder is effected by hammer blows. It sometimes happens that the securing clip is distorted or twisted during installation of the pick. This does not become apparent until mining operations are commenced. The result is the pick is not properly mounted in its holder and is quickly damaged and worn with consequential wear and damage to the holder itself. Also damaged clips could allow the pick to become easily dislodged from its holder and lost before they are worn out. The number of picks mounted in a cutter head vary in accordance with the type of head used. As previously stated the number varies from 100 to 300 picks and it is not uncommon to replace up to 75 worn, damaged or lost picks in a normal mining shift.
The removal of worn or damaged picks and the replacement with new ones is a laborious and time consuming operation.
In particular, when a clip is distorted or twisted part of the clip extends down the shank of the pick causing an interference fit between the pick and the holder. Removal of such a pick from its holder is difficult and requires the use of a punch and heavy blows with a seven pound hammer which is both dangerous and time consuming. In the installation process the shank of the pick has to be driven into the bore in the cutter head and in a removal operation a tool is engaged in the peripheral groove or grooves in the cutter head. In both mounting and dismounting operations force is applied to the pick and tool by hammer blows.
In consequence, securing clips as presently used suffer from a number of disadvantages and there has been a need to provide a securing clip which will not be damaged during installation, which will not damage the holder in the cutting head, which will properly and securely retain the pick in its holder and which leads to ease of operation in the installation and removal of the pick from its holder.
The invention accordingly provides a novel securing clip for use with picks of the type referred to and which will overcome the problems associated with spring steel clips as currently used and which will retain the pick in its holder until its replacement becomes necessary and which will allow the pick to freely rotate in its holder throughout its working life.
In accordance with a preferred embodiment of the invention a securing clip to retain a pick in its holder in a mining machine, said pick having a body or head with a pick point thereon and a shank extending from said body with a circumferential groove or channel adjacent the end of said shank, said clip comprising a cylindrical member formed of elastomeric material and of such dimension that it can be force fitted over said shank and accommodated in said channel, said cylindrical member having a smooth internal wall with a circumferential bead or flange on its outerwall intermediate its ends which is engageable in a circumferential groove in said pick holder to retain said pick in said holder.
A preferred embodiment of the invention will now be described with reference to the accompanying drawings in which:
Fig. 1 is a perspective view of a conventional coal pick with a spring steel securing clip positioned thereon;
Fig. 2 is a perspective view of the securing clip illustrated in Fig. 1 ; Fig. 3 is a perspective view of a pick with a damaged spring steel clip;
Fig. 4 is a perspective view of a securing clip in accordance with the invention; and
Fig. 5 is a perspective view of a securing clip in accordance with the invention fitted to a conventional pick. Referring now to the drawings as illustrated in Fig.1 the pick designated generally by the reference 1 includes a cone shaped body 2 provided with a pick point 3 and an extraction groove 4. A shank 5 extends from the rear end of the head is provided with a circumferential groove 6 which accommodates a securing clip 7. The securing clip is manufactured from spring steel. It is of the split-ring type as illustrated in Fig 2 and has a number of dimples 8 pressed outwardly therefrom which when the pick is mounted in a holder in the cutter head of a mining machine accommodated in a circumferential groove (not shown) therein.
Fig. 3 illustrates a conventional pick with a damaged spring steel clip 7. It will be noted that the clip has opened and the wall 9 has twisted and been forced over the rear end of the shank 5. This prevents rotation of the pick in its holder and makes it extremely difficult and dangerous to extract it.
The securing clip illustrated in Fig. 4 is made from plastic elastomeric material preferably polyurethane and comprises a sleeve 10 having a smooth internal wall 11 and an external circumferential flange or bead 12. The inner diameter of the sleeve is such that it can be force fitted over the rear end of shank 5 and accommodated in groove 6. The flange 12 when the pick is mounted in a holder in the cutter head of a mining machine being accommodated in a circumferential groove therein to retain the pick in said holder.
SUBSTITUTE SHEET (RULE 26

Claims

THE CLAIMS:
1 A securing clip to retain a pick in its holder in a mining machine, said pick having a body or head with a pick point thereon and a shank extending from said body with a circumferential groove or channel adjacent the end of said shank, said clip comprising a cylindrical member formed of elastomeric material and of such dimension that it can be force fitted over said shank and accommodated in said channel, said cylindrical member having a smooth internal wall with a circumferential bead or flange on its outerwall intermediate its ends which is engageable in a circumferential groove in said pick holder to retain said pick in said holder. 2. A securing clip as claimed in claim 1 wherein said clip is formed of polyurethane. 3. A securing clip substantially as hereinbefore described with reference to Figures
PCT/AU1995/000189 1994-04-08 1995-04-04 Improvements in securing clips for coal and rock picks WO1995027840A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU21320/95A AU2132095A (en) 1994-04-08 1995-04-04 Improvements in securing clips for coal and rock picks

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPM4944 1994-04-08
AUPM4944A AUPM494494A0 (en) 1994-04-08 1994-04-08 Integrated drilling and rock bolting apparatus

Publications (1)

Publication Number Publication Date
WO1995027840A1 true WO1995027840A1 (en) 1995-10-19

Family

ID=3779524

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1995/000189 WO1995027840A1 (en) 1994-04-08 1995-04-04 Improvements in securing clips for coal and rock picks

Country Status (3)

Country Link
AU (1) AUPM494494A0 (en)
WO (1) WO1995027840A1 (en)
ZA (1) ZA952885B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001023708A1 (en) 1999-09-28 2001-04-05 Voest-Alpine Bergtechnik Gesellschaft M.B.H. Device for detachably fixing a rounded-shaft tool into a tool bushing
WO2004109059A1 (en) * 2003-06-03 2004-12-16 Gerd Elfgen Retaining element for a round shank bit on a milling machine
WO2006108200A1 (en) * 2005-04-14 2006-10-19 Sattler, Erich Plastic ring for removeably fixing a round shank chisel in a chisel bush
CN110714502A (en) * 2019-10-10 2020-01-21 北京三一智造科技有限公司 Toothholder, bucket tooth, tooth tool and excavating equipment

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE29900E (en) * 1968-08-08 1979-02-06 Kennametal Inc. Pick-type mining bit with support block having rotatable seat
AU3046077A (en) * 1977-04-01 1979-05-17 Hall & Pickles Limited Mineral cutting pick
US4247147A (en) * 1979-11-21 1981-01-27 Sandvik Aktiebolag Retainer clip for cutter bits
GB1602697A (en) * 1977-05-12 1981-11-11 Lamouric P Tool-holding devices
EP0201073B1 (en) * 1985-05-10 1988-06-08 Hans Krummenauer GmbH & Co. KG Pick holder for a cutting tool
US5110244A (en) * 1991-08-27 1992-05-05 Caterpillar Inc. Fastener assembly

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE29900E (en) * 1968-08-08 1979-02-06 Kennametal Inc. Pick-type mining bit with support block having rotatable seat
AU3046077A (en) * 1977-04-01 1979-05-17 Hall & Pickles Limited Mineral cutting pick
GB1602697A (en) * 1977-05-12 1981-11-11 Lamouric P Tool-holding devices
US4247147A (en) * 1979-11-21 1981-01-27 Sandvik Aktiebolag Retainer clip for cutter bits
EP0201073B1 (en) * 1985-05-10 1988-06-08 Hans Krummenauer GmbH & Co. KG Pick holder for a cutting tool
US5110244A (en) * 1991-08-27 1992-05-05 Caterpillar Inc. Fastener assembly

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001023708A1 (en) 1999-09-28 2001-04-05 Voest-Alpine Bergtechnik Gesellschaft M.B.H. Device for detachably fixing a rounded-shaft tool into a tool bushing
WO2004109059A1 (en) * 2003-06-03 2004-12-16 Gerd Elfgen Retaining element for a round shank bit on a milling machine
WO2006108200A1 (en) * 2005-04-14 2006-10-19 Sattler, Erich Plastic ring for removeably fixing a round shank chisel in a chisel bush
AU2006235185B2 (en) * 2005-04-14 2010-12-16 Robert Exel Plastic ring for removeably fixing a round shank chisel in a chisel bush
AU2006235185B8 (en) * 2005-04-14 2011-03-10 Robert Exel Plastic ring for removeably fixing a round shank chisel in a chisel bush
EP1869286B2 (en) † 2005-04-14 2014-03-05 Sattler, Erich Plastic ring for removeably fixing a round shank chisel in a chisel bush
CN110714502A (en) * 2019-10-10 2020-01-21 北京三一智造科技有限公司 Toothholder, bucket tooth, tooth tool and excavating equipment
CN110714502B (en) * 2019-10-10 2024-06-11 北京三一智造科技有限公司 Toothholder, bucket tooth, tooth tool and excavating equipment

Also Published As

Publication number Publication date
AUPM494494A0 (en) 1994-05-05
ZA952885B (en) 1995-12-21

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