USRE33494E - Pick holding arrangements - Google Patents
Pick holding arrangements Download PDFInfo
- Publication number
- USRE33494E USRE33494E US07/184,960 US18496088A USRE33494E US RE33494 E USRE33494 E US RE33494E US 18496088 A US18496088 A US 18496088A US RE33494 E USRE33494 E US RE33494E
- Authority
- US
- United States
- Prior art keywords
- pick
- bore
- forwardly
- shank
- sleeve
- 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
Links
- 238000005520 cutting process Methods 0.000 claims abstract description 17
- 230000000717 retained effect Effects 0.000 claims abstract 3
- 239000002184 metal Substances 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 2
- 229910000760 Hardened steel Inorganic materials 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Images
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
Definitions
- This invention relates to holding arrangements for cutting picks, particularly but not necessarily exclusively point attack picks, which are intended to be free to rotate in use. It relates to rotatable cutter picks themselves and to assemblies of other picks with their holding arrangements.
- an arrangement for holding a cutter pick comprising a pick box having a bore and sleeve receiving a shank of the pick lining at least a part of the length of said bore, the sleeve being rotatable in the bore to permit rotation of the pick about a longitudinal axis, a thrust ring at the front end of the bore being arranged to fit closely to the tool and the bore so as to impede the passage of foreign matter into the bore, said ring having an end face to support the pick against rearward axial forces.
- a cutter pick assembly comprising a point attack cutter pick rotatably mounted in a sleeved bore of a pick box, the forward end of said bore being substantially closed against the ingress of foreign matter by a metal thrust and seal ring closely fitting the pick and the pick box and having a forward annular face for supporting the pick against rearwardly directed cutting forces.
- a point attack cutter pick comprising a cylindrical shank having an annular recess receiving a spring clip for retaining the pick shank axially in a bore of a sleeve and having a radially extending skirt at the forward end of the shank with a rearwardly directed recess for engagement by a thrust and seal ring supporting the pick against rearwardly directed cutting forces.
- the drawing shows a pick box 2 with a cylindrical bore 4 in which a sleeve 6 is held axially between a front thrust ring 8 and an annular rear wall 10 of the bore.
- the ring and the bore have annular recesses 12, 14 that come into registration with each other when the thrust ring is inserted, and a spring clip 16 that is resiliently deformable into the thrust ring recess during insertion but then springs out to engage both recesses.
- the front end face 8a of the thrust ring tapers forwardly to define a V-shaped cross-sectional form with the apex projecting forwards. That is, a first portion 27 of the end face 8a extends radially outwardly and axially outwardly and converges forwardly relative to a second portion 29 which extends radially inwardly and axially forwardly.
- Both the sleeve and the thrust ring are of a hard metallic material, e.g. hardened steel.
- a point attack coal-cutter pick 20 is inserted into the bore to seat in the sleeve 6 and be held there frictionally by a spring clip 22 located on a smaller diameter intermediate portion 24a of the pick shank 24.
- the axial retention of the thrust ring also traps the sleeve 6 in the bore by means of a radially extending portion 34 of a rear end face 30 of the ring which extends into the path of the sleeve.
- the annular front shoulder 26 of the pick has a rear face 28 which includes a recess-shaped complementary to the front face of the thrust ring and these two faces normally fit closely to togetherher, as do the inner peripheral face of the thrust ring and the opposed periphery of the pick shank.
- the thrust ring therefore acts not only to react the rearwardly directed cutting forces on the pick due to engagement of the rear end face 30 of the ring with a radial shoulder 32 of the bore, but also as a seal restricting the passage of foreign matter, in particular abrasive particles, into the bore.
- the rear of the bore may be sealed by a snap-in cap (not shown) which can be removed to allow a driver (not shown) to be inserted when the pick is replaced.
- the pick In use, the pick is intended to operate in the usual manner of a point attack pick, rotating randomly about its axis as it cuts in order to extend its useful life.
- the sleeve is freely rotatable in the pick box bore, although rotation between the shank and the sleeve is also not excluded.
- the thrust ring 8 may be rotatably fixed to the pick box or may be left free to rotate in the box. A gap between the thrust ring and the sleeve ensures that its freedom to rotate is not restrained by axial forces transmitted through the thrust ring.
- the rotatability of the pick in use is less readily affected by the dirty conditions in which such picks are used and the life of the pick is thereby extended.
- the choice of a hard material for the ring 8 ensures that it can be placed at the very front of the tool box bore where a seal is best effected and yet it is capable of withstanding the substantial axial forces generated during the cutting.
- the hardness of the thrust ring material also ensures that it has along operational life.
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)
- Percussive Tools And Related Accessories (AREA)
- Tires In General (AREA)
Abstract
A cutter pick assembly comprises a point attack cutter pick rotatably mounted in a pick box through a sleeve in a bore. In front of the sleeve a hardened metal thrust and seal ring is mounted surrounding the forward end of the pick shank. The ring has a front face which engages in a recess in a shoulder of the pick and the ring both supports the pick against rearwardly directed cutting forces and provides a sufficiently close fit with the pick and the pick box bore to limit passage into the bore of foreign matter that may interfere with rotation of the pick in use. The thrust ring is retained axially in the bore by a spring clip and a further spring clip holds the pick axially in the sleeve, the latter being trapped in the bore by the thrust ring.
Description
This invention relates to holding arrangements for cutting picks, particularly but not necessarily exclusively point attack picks, which are intended to be free to rotate in use. It relates to rotatable cutter picks themselves and to assemblies of other picks with their holding arrangements.
To provide for rotatability it is known to provide a pick with a cylindrical shank fitting freely in a cylindrical bore of a pick box, which may be sleeved to make rotation easier. These picks are usually employed in the severe conditions of mining and it is found that the freedom of a pick to rotate in the bore is impaired by build-up of foreign matter in the bore. As a result the working life of the pick will be considerably reduced because wear is concentrated on only a portion of the cutting tip.
According to one aspect of the invention there is provided an arrangement for holding a cutter pick comprising a pick box having a bore and sleeve receiving a shank of the pick lining at least a part of the length of said bore, the sleeve being rotatable in the bore to permit rotation of the pick about a longitudinal axis, a thrust ring at the front end of the bore being arranged to fit closely to the tool and the bore so as to impede the passage of foreign matter into the bore, said ring having an end face to support the pick against rearward axial forces.
According to another aspect of the invention, there is provided a cutter pick assembly comprising a point attack cutter pick rotatably mounted in a sleeved bore of a pick box, the forward end of said bore being substantially closed against the ingress of foreign matter by a metal thrust and seal ring closely fitting the pick and the pick box and having a forward annular face for supporting the pick against rearwardly directed cutting forces.
According to a further aspect of the invention, there is provided a point attack cutter pick comprising a cylindrical shank having an annular recess receiving a spring clip for retaining the pick shank axially in a bore of a sleeve and having a radially extending skirt at the forward end of the shank with a rearwardly directed recess for engagement by a thrust and seal ring supporting the pick against rearwardly directed cutting forces.
By way of example, the accompanying drawing illustrates an embodiment of the invention in axial section.
The drawing shows a pick box 2 with a cylindrical bore 4 in which a sleeve 6 is held axially between a front thrust ring 8 and an annular rear wall 10 of the bore. To hold the thrust ring axially in the pick box, the ring and the bore have annular recesses 12, 14 that come into registration with each other when the thrust ring is inserted, and a spring clip 16 that is resiliently deformable into the thrust ring recess during insertion but then springs out to engage both recesses.
The front end face 8a of the thrust ring tapers forwardly to define a V-shaped cross-sectional form with the apex projecting forwards. That is, a first portion 27 of the end face 8a extends radially outwardly and axially outwardly and converges forwardly relative to a second portion 29 which extends radially inwardly and axially forwardly. Both the sleeve and the thrust ring are of a hard metallic material, e.g. hardened steel.
A point attack coal-cutter pick 20 is inserted into the bore to seat in the sleeve 6 and be held there frictionally by a spring clip 22 located on a smaller diameter intermediate portion 24a of the pick shank 24. The axial retention of the thrust ring also traps the sleeve 6 in the bore by means of a radially extending portion 34 of a rear end face 30 of the ring which extends into the path of the sleeve.
The annular front shoulder 26 of the pick has a rear face 28 which includes a recess-shaped complementary to the front face of the thrust ring and these two faces normally fit closely togehther, as do the inner peripheral face of the thrust ring and the opposed periphery of the pick shank. The thrust ring therefore acts not only to react the rearwardly directed cutting forces on the pick due to engagement of the rear end face 30 of the ring with a radial shoulder 32 of the bore, but also as a seal restricting the passage of foreign matter, in particular abrasive particles, into the bore. The rear of the bore may be sealed by a snap-in cap (not shown) which can be removed to allow a driver (not shown) to be inserted when the pick is replaced.
In use, the pick is intended to operate in the usual manner of a point attack pick, rotating randomly about its axis as it cuts in order to extend its useful life. For this purpose the sleeve is freely rotatable in the pick box bore, although rotation between the shank and the sleeve is also not excluded. The thrust ring 8 may be rotatably fixed to the pick box or may be left free to rotate in the box. A gap between the thrust ring and the sleeve ensures that its freedom to rotate is not restrained by axial forces transmitted through the thrust ring.
Because the bore 4 is closed at the front by the thrust ring 8, the rotatability of the pick in use is less readily affected by the dirty conditions in which such picks are used and the life of the pick is thereby extended. At the same time, the choice of a hard material for the ring 8 ensures that it can be placed at the very front of the tool box bore where a seal is best effected and yet it is capable of withstanding the substantial axial forces generated during the cutting. The hardness of the thrust ring material also ensures that it has along operational life.
Claims (10)
1. A holding arrangement for a cutter pick of the type comprising a rearwardly open, forwardly tapering recess, said holding arrangement comprising:
a pick box containing a forwardly open bore defining a front-to-rear extending longitudinal axis and including a radial shoulder,
a sleeve disposed within and lining at least a portion of said bore and sized to receive therein a shank of the pick, said sleeve being rotatable about said axis to permit rotation of the pick about said axis; and
a thrust ring extending into a front end of said bore and retained therein against axial dislodgement, said thrust ring arranged to closely fit said pick and said bore to impede the passage of foreign matter into said bore, said thrust ring including a front end face and a rear radial surface bearing against said shoulder for resisting axial inward forces applied thereagainst by the pick during a cutting action, and a radially extending portion extending into the path of said sleeve for preventing axial dislodgement thereof,
said front end face defined by a first portion extending radially outwardly and axially forwardly, and a second portion extending radially inwardly and axially forwardly, said first and second portions converging forwardly in V-shape to engage first and second forwardly converging surfaces of said recess formed in said pick.
2. An arrangement according to claim 1 including a resilient retaining ring acting between said thrust ring and said pick box for retaining said thrust ring against axial dislodgement from said bore.
3. An arrangement according to claim 2, wherein said retaining ring comprises a radially elastic annular clip disposed within an annular groove defined by radially aligned recesses in said thrust ring and said bore.
4. An arrangement according to claim 1, wherein said radial shoulder is situated between a front end of said sleeve and a front end of said pick box, said radial surface of said thrust ring being defined by a rear end face of said thrust ring, said radially extending portion of said thrust ring being defined by a portion of said end face projecting radially inwardly beyond said shoulder into radially overlying relationship with said sleeve.
5. An arrangement according to claim 1, wherein said thrust ring is rotatable about said axis.
6. An arrangement according to claim 1 including frictional retaining means disposed along an inside wall of said sleeve for engagement with the pick shank.
7. A cutting pick assembly comprising:
a point attack bit including a front cutting face, a rearwardly projecting shank, and a shoulder disposed between said cutting face and said shank, said shoulder including a rearwardly open, forwardly tapering recess defined by first and second forwardly converging surfaces,
a pick box containing a forwardly open bore defining a front-to-rear extending longitudinal axis and including a radial shoulder disposed rearwardly of a front end of said bore,
a sleeve disposed within said bore and lining a portion of said bore, said sleeve receiving said shank axially therein, said sleeve being rotatable about said axis to permit rotation of said pick about said axis, and
a thrust ring extending into a front end of said bore and retained therein against axial dislodgement, said thrust ring arranged to closely fit said pick and said bore to impede the passage of foreign matter into said bore, said thrust ring including:
a front end face defined by a first portion extending radially outwardly and axially forwardly, and a second portion extending radially inwardly and axially forwardly, said first and second portions converging forwardly in V-shape to engage said first and second surfaces of said recess in said bit, and
a rear end face bearing against said shoulder of said bore to resist axial forces applied against said thrust ring by said pick during a cutting operation, and a radially extending portion extending in front of said sleeve to prevent axial dislodgement thereof.
8. An assembly according to claim 7 including a retainer acting between said shank and said sleeve for axially retaining said shank in place while permitting rotation thereof about said axis. .Iadd.
9. A cutting pick assembly comprising:
a point attack bit including a front cutting face, a rearwardly projecting cylindrical shank, and a shoulder disposed between said cutting face and said shank, said shoulder including a rearwardly open, forwardly tapering recess defined by first and second forwardly converging frusto-conical surfaces,
a pick box containing a forwardly open bore defining a front-to-rear extending longitudinal axis for receiving said shank axially therein, one of said frusto-conical surfaces extending from a forward end of said cylindrical shank,
means retaining said shank in said bore and permitting rotation of said pick about said axis,
said pick box carrying a face surrounding a front end of said bore, said face defined by a first frusto-conical portion extending radially outwardly and axially forwardly, and a second frusto-conical portion extending radially inwardly and axially forwardly, said first and second frusto-conical portions converging forwardly in V-shape to engage said first and second frusto-conical surfaces of said recess in said bit, to impede the passage of foreign matter into said bore. .Iaddend. .Iadd.
10. A point attack bit adapted to be mounted in a pick box, said point attack bit comprising a front cutting face, a rearwardly projecting cylindrical shank, and a shoulder disposed between said cutting face and said shank, said shoulder including a rearwardly open, forwardly tapering recess defined by first and second forwardly converging frusto-conical surfaces, one of said frusto-conical surfaces extending from a forward end of said cylindrical shank, said frusto-conical surfaces adapted to engage corresponding surfaces on the pick box to impede the passage of foreign matter. .Iaddend.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB838306641A GB8306641D0 (en) | 1983-03-10 | 1983-03-10 | Pick holding arrangements |
GB8306641 | 1983-03-10 |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US06/587,224 Reissue US4603911A (en) | 1983-03-10 | 1984-03-07 | Pick holding arrangements |
Publications (1)
Publication Number | Publication Date |
---|---|
USRE33494E true USRE33494E (en) | 1990-12-18 |
Family
ID=10539329
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US06/587,224 Ceased US4603911A (en) | 1983-03-10 | 1984-03-07 | Pick holding arrangements |
US07/184,960 Expired - Lifetime USRE33494E (en) | 1983-03-10 | 1988-04-19 | Pick holding arrangements |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US06/587,224 Ceased US4603911A (en) | 1983-03-10 | 1984-03-07 | Pick holding arrangements |
Country Status (6)
Country | Link |
---|---|
US (2) | US4603911A (en) |
AU (1) | AU578892B2 (en) |
DE (1) | DE3408209C2 (en) |
FR (2) | FR2542369B1 (en) |
GB (1) | GB8306641D0 (en) |
ZA (1) | ZA841792B (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040118615A1 (en) * | 2002-12-20 | 2004-06-24 | Beach Wayne H. | Rotatable bit having a resilient retainer sleeve with clearance |
US8033616B2 (en) | 2006-08-11 | 2011-10-11 | Schlumberger Technology Corporation | Braze thickness control |
US8123302B2 (en) | 2006-08-11 | 2012-02-28 | Schlumberger Technology Corporation | Impact tool |
CN102535561A (en) * | 2011-01-03 | 2012-07-04 | 山特维克知识产权股份有限公司 | Polygon-shaped carbide tool pick |
US8449040B2 (en) | 2006-08-11 | 2013-05-28 | David R. Hall | Shank for an attack tool |
US8454096B2 (en) | 2006-08-11 | 2013-06-04 | Schlumberger Technology Corporation | High-impact resistant tool |
US8701799B2 (en) | 2009-04-29 | 2014-04-22 | Schlumberger Technology Corporation | Drill bit cutter pocket restitution |
Families Citing this family (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3439491A1 (en) * | 1984-10-27 | 1986-04-30 | Gerd 5303 Bornheim Elfgen | ROUNDING CHISEL |
US4836614A (en) * | 1985-11-21 | 1989-06-06 | Gte Products Corporation | Retainer scheme for machine bit |
EP0259620A1 (en) * | 1986-09-09 | 1988-03-16 | Kennametal Inc. | Cutter bit having hard tip with middle section defined by concave surface of revolution |
DE3701905C1 (en) * | 1987-01-23 | 1988-09-15 | Betek Bergbau & Hartmetall | Attachment of a round shank chisel |
US5078540A (en) * | 1990-08-24 | 1992-01-07 | Astec Industries, Inc. | Asphalt pavement milling machine and cutter drum therefor |
DE4202961C2 (en) * | 1992-02-01 | 1994-06-16 | Boart Hwf Gmbh Co Kg | Chisel holder |
US5415462A (en) * | 1994-04-14 | 1995-05-16 | Kennametal Inc. | Rotatable cutting bit and bit holder |
US5628549A (en) * | 1995-12-13 | 1997-05-13 | Kennametal Inc. | Cutting tool sleeve rotation limitation system |
DE19630642C2 (en) * | 1996-07-30 | 1999-04-22 | Betek Bergbau & Hartmetall | Tool for a cutting machine |
US5730502A (en) * | 1996-12-19 | 1998-03-24 | Kennametal Inc. | Cutting tool sleeve rotation limitation system |
DE19856916C1 (en) * | 1998-12-10 | 2000-08-31 | Betek Bergbau & Hartmetall | Attachment for a round shank chisel |
PL187208B1 (en) * | 1999-01-25 | 2004-06-30 | Boart Longyear Gmbh & Co Kg | Rotary cutter assembly for mining machines |
US6478383B1 (en) | 1999-10-18 | 2002-11-12 | Kennametal Pc Inc. | Rotatable cutting tool-tool holder assembly |
US6758530B2 (en) | 2001-09-18 | 2004-07-06 | The Sollami Company | Hardened tip for cutting tools |
US6739327B2 (en) | 2001-12-31 | 2004-05-25 | The Sollami Company | Cutting tool with hardened tip having a tapered base |
RU2533799C2 (en) * | 2012-09-04 | 2014-11-20 | Анатолий Витальевич Костюченко | Method of orienting, assembling and locking of thrust tool in holder by self-locking retainer with help of low-wear orienting bushes and controlled low-wear thrusts |
CN102828750B (en) * | 2012-09-11 | 2015-08-05 | 三一重型装备有限公司 | Pick device and mining machinery |
US9028008B1 (en) * | 2014-01-16 | 2015-05-12 | Kennametal Inc. | Cutting tool assembly including retainer sleeve with compression band |
US10107098B2 (en) * | 2016-03-15 | 2018-10-23 | The Sollami Company | Bore wear compensating bit holder and bit holder block |
US20200080420A1 (en) * | 2018-09-12 | 2020-03-12 | Joy Global Underground Mining Llc | Sleeve retention for cutting pick assembly |
CN112282754B (en) * | 2020-10-29 | 2021-06-01 | 徐州中矿汇弘矿山设备有限公司 | Tooth holder and tooth boot system |
US11585217B2 (en) | 2021-03-11 | 2023-02-21 | Kennametal Inc. | Washerless cutting tool assembly |
US12006825B2 (en) | 2021-03-11 | 2024-06-11 | Kennametal Inc. | Cutting tool with shank portion configured for limiting rotation and controlling orientation of the tool |
USD982633S1 (en) | 2021-03-11 | 2023-04-04 | Kennametal Inc. | Washerless cutting tool assembly |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1747907A (en) * | 1927-03-22 | 1930-02-18 | Earl A Reed | Bit |
US1792604A (en) * | 1925-10-07 | 1931-02-17 | Earl A Reed | Bit |
US3307645A (en) * | 1964-10-20 | 1967-03-07 | Exxon Production Research Co | Reverse bearing bit |
US3512838A (en) * | 1968-08-08 | 1970-05-19 | Kennametal Inc | Pick-type mining tool |
GB2024287A (en) * | 1978-06-15 | 1980-01-09 | Voest Alpine Ag | Toolbit arrangement for a rotary mining tool |
US4201421A (en) * | 1978-09-20 | 1980-05-06 | Besten Leroy E Den | Mining machine bit and mounting thereof |
US4302053A (en) * | 1980-02-23 | 1981-11-24 | The United States Of America As Represented By The Secretary Of The Interior | Mounting block to rotate coal cutter bits |
US4489986A (en) * | 1982-11-01 | 1984-12-25 | Dziak William A | Wear collar device for rotatable cutter bit |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ZA721763B (en) * | 1971-04-01 | 1972-12-27 | Kennametal Inc | Cutter chain |
AT358510B (en) * | 1978-10-19 | 1980-09-10 | Voest Ag | DEVICE FOR COOLING THE CHISELING TOOLS OF A BREAKING MACHINE AND THE LOCAL CHEST |
AU536728B2 (en) * | 1980-05-20 | 1984-05-24 | Kennametal Inc. | Mining cutter |
-
1983
- 1983-03-10 GB GB838306641A patent/GB8306641D0/en active Pending
-
1984
- 1984-03-07 DE DE3408209A patent/DE3408209C2/en not_active Expired - Lifetime
- 1984-03-07 US US06/587,224 patent/US4603911A/en not_active Ceased
- 1984-03-09 FR FR8403643A patent/FR2542369B1/en not_active Expired
- 1984-03-09 AU AU25457/84A patent/AU578892B2/en not_active Expired
- 1984-03-09 ZA ZA841792A patent/ZA841792B/en unknown
-
1987
- 1987-05-19 FR FR878706962A patent/FR2600716B1/en not_active Expired - Lifetime
-
1988
- 1988-04-19 US US07/184,960 patent/USRE33494E/en not_active Expired - Lifetime
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1792604A (en) * | 1925-10-07 | 1931-02-17 | Earl A Reed | Bit |
US1747907A (en) * | 1927-03-22 | 1930-02-18 | Earl A Reed | Bit |
US3307645A (en) * | 1964-10-20 | 1967-03-07 | Exxon Production Research Co | Reverse bearing bit |
US3512838A (en) * | 1968-08-08 | 1970-05-19 | Kennametal Inc | Pick-type mining tool |
GB2024287A (en) * | 1978-06-15 | 1980-01-09 | Voest Alpine Ag | Toolbit arrangement for a rotary mining tool |
US4201421A (en) * | 1978-09-20 | 1980-05-06 | Besten Leroy E Den | Mining machine bit and mounting thereof |
US4302053A (en) * | 1980-02-23 | 1981-11-24 | The United States Of America As Represented By The Secretary Of The Interior | Mounting block to rotate coal cutter bits |
US4489986A (en) * | 1982-11-01 | 1984-12-25 | Dziak William A | Wear collar device for rotatable cutter bit |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040118615A1 (en) * | 2002-12-20 | 2004-06-24 | Beach Wayne H. | Rotatable bit having a resilient retainer sleeve with clearance |
US6851758B2 (en) | 2002-12-20 | 2005-02-08 | Kennametal Inc. | Rotatable bit having a resilient retainer sleeve with clearance |
US8033616B2 (en) | 2006-08-11 | 2011-10-11 | Schlumberger Technology Corporation | Braze thickness control |
US8123302B2 (en) | 2006-08-11 | 2012-02-28 | Schlumberger Technology Corporation | Impact tool |
US8449040B2 (en) | 2006-08-11 | 2013-05-28 | David R. Hall | Shank for an attack tool |
US8454096B2 (en) | 2006-08-11 | 2013-06-04 | Schlumberger Technology Corporation | High-impact resistant tool |
US8701799B2 (en) | 2009-04-29 | 2014-04-22 | Schlumberger Technology Corporation | Drill bit cutter pocket restitution |
CN102535561A (en) * | 2011-01-03 | 2012-07-04 | 山特维克知识产权股份有限公司 | Polygon-shaped carbide tool pick |
US20120167420A1 (en) * | 2011-01-03 | 2012-07-05 | Sandvik Intellectual Property Ab | Polygon-shaped carbide tool pick |
Also Published As
Publication number | Publication date |
---|---|
AU578892B2 (en) | 1988-11-10 |
DE3408209C2 (en) | 1994-09-29 |
FR2542369A1 (en) | 1984-09-14 |
FR2600716B1 (en) | 1993-06-11 |
AU2545784A (en) | 1984-09-13 |
FR2600716A1 (en) | 1987-12-31 |
DE3408209A1 (en) | 1984-09-13 |
FR2542369B1 (en) | 1987-10-02 |
US4603911A (en) | 1986-08-05 |
ZA841792B (en) | 1984-10-31 |
GB8306641D0 (en) | 1983-04-13 |
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