US3801158A - Rotating hub assembly for a mining cutter bit - Google Patents

Rotating hub assembly for a mining cutter bit Download PDF

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Publication number
US3801158A
US3801158A US00300539A US3801158DA US3801158A US 3801158 A US3801158 A US 3801158A US 00300539 A US00300539 A US 00300539A US 3801158D A US3801158D A US 3801158DA US 3801158 A US3801158 A US 3801158A
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US
United States
Prior art keywords
hub assembly
bit block
bit
axial opening
assembly
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
US00300539A
Inventor
L Wolfe
F Radd
D Oertle
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.)
C0NSOLIDATION COAL Co
Consolidation Coal Co
ConocoPhillips Co
Original Assignee
Continental Oil Co
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Application filed by Continental Oil Co filed Critical Continental Oil Co
Application granted granted Critical
Publication of US3801158A publication Critical patent/US3801158A/en
Assigned to CONSOLIDATION COAL COMPANY, A CORP OF DE. reassignment CONSOLIDATION COAL COMPANY, A CORP OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. SUBJECT TO LICENSE RECITED Assignors: CONOCO, INC.
Assigned to C0NSOLIDATION COAL COMPANY reassignment C0NSOLIDATION COAL COMPANY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: CONOCO INC., A CORP. OF DE.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH 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
    • E21C35/193—Means for fixing picks or holders using bolts as main fixing elements
    • E21C35/1933—Means for fixing picks or holders using bolts as main fixing elements the picks having a cylindrical shank
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH 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
    • E21C35/191—Means for fixing picks or holders for fixing holders
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH 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

  • ABSTRACT A mounting assembly for a mining tool adapted to fit in a bit block consisting of a hub assembly having an axial opening therethrough of a size to journal a mining cutter bit.
  • the bit block has a larger opening adapted to accept the hub assembly and permit rotation of the hub assembly in the bit block.
  • the hub assembly extends over the bit block so that a seal can be mounted between the bit block and the hub assembly.
  • a peripheralgroove is formed in the hub assembly'so that a screw can lock the hub assembly into the bit [56] References Cited block.
  • FIG. 1 is a cross-sectional view of the hub assembly with the cutter bit in full view
  • FIG. 2 is a top view of FIG. 1 having a partial section through lines 22 of FIG. 1.
  • a bit block is attached to a continuous mining machine belt 11 by means of a weld or other suitable attaching means 12.
  • the bit block 10 has an axial opening 13 for receiving a rotatably journaling hub assembly generally referred to as 14.
  • Hub assembly 14 essentially comprises a cylinder portion 15, a second cylinder portion 16 having a larger diameter than portion 15, a downwardly extending circumferential lip 17, and an axial opening 18 adapted to receive cutter bit 19.
  • a plurality of impact arms 20 is attached normal to the surface of cylindrical portion 16.
  • Axial opening 18 has a circumferential groove 21 adapted to receive a locking ring 22 having a plurality of dimples 23 which snap into circumferential groove 21 and retain the cutter bit in axial opening 18.
  • the cutter bit is of the usual type having a shank 30, a removal groove 31, a conical tip 32, and a hardened tungsten carbide insert tip 33.
  • Cylindrical portion has a circumferential groove 40 which mates with a threaded opening 41 having a bolt 42 therein.
  • the tip 43 of bolt 42 fits into groove 40 and retains hub assembly 14 in axial opening 13.
  • the seal assembly comprises a projection 50 on the bit block 10 which has a recess 51. Seal 52 fits into recess 51 and extends to the inside of the circumferential lip 17. Since the seal is fairly well restrained from movement, no means need be provided for anchoring the seal in recess 51.
  • the space between bit block and cylindrical portion 15 may be lubricated by any suitable lubricant, such as grease, oil, graphite, or the like. In some instances it may be preferable to leave any form of lubricant out of the space, since, in spite of the seal, some dust may get into the lubricant, causing the hub assembly to bind to bit block 10 when the dust mixes with the lubricant. Operation Unlike the prior art, dust, dirt and water are prevented from entering the bearing surface between bit block 10 and cylindrical portion 15 by virtue of the seal 52. Any dirt or dust entering the passageway will be blocked effectively by the seal.
  • the seal also provides for free rotation of the hub assembly. The cutter bit 19 is also free to rotate. If the hub assembly should bind, bolt 42 can be removed and the hub assembly lifted out and cleaned. The seal can also easily be replaced using the same procedure.
  • a second advantage is that, should the area around the shoulder of the cutter bit become damaged due to impacting of product, such as coal, the hub assembly can be removed; and a new one can be substituted without necessitating breaking the weld 12 and substituting an entire new bit block.
  • the impacting arm 20 being formed on the cylindrical portion 16 provides a method of insuring rotation of the hub assembly. Since the impact arm 20 is mounted to the hub assembly, there is no need to provide additional impact arms on the cutter bit 19, thus reducing the cost of the cutter bit.
  • Seal 52 may be made of any suitable seal material, such as rubber or one or more of the manufactured plastics.
  • a sealed hub assembly has been disclosed which will function in spite of the environmental contaminants in the region of the cutter bit.
  • the seal assembly furthermore, is easy to maintain.
  • a mounting for a mining tool comprising:
  • a hub assembly having an axial opening therethrough of a size to journal a mining cutter bit
  • a hub assembly for a cutter bit comprising a bit block having an axial opening therein; a hub assembly having a cylindrical portion dimensioned to fit the axial opening in said bit block, said cylindrical portion having a length sufficient to extend from said axial opening, said portion extending from said axial opening having a circumferential lip, a circumferential seal; means for mounting said circumferential seal between said bit block and said circumferential lip; a peripheral groove in said cylindrical portion dimensioned to fit said axial opening in said bit block; retainer means mounted in 5.
  • An assembly as described in claim 4 having a plusaid bit block and engaging said circumferential rality of impact arms mounted normal to the surface of groove; and an axial opening in said hub assembly of a said hub assembly.

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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)
  • Earth Drilling (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)

Abstract

A mounting assembly for a mining tool adapted to fit in a bit block consisting of a hub assembly having an axial opening therethrough of a size to journal a mining cutter bit. The bit block has a larger opening adapted to accept the hub assembly and permit rotation of the hub assembly in the bit block. The hub assembly extends over the bit block so that a seal can be mounted between the bit block and the hub assembly. A peripheral groove is formed in the hub assembly so that a screw can lock the hub assembly into the bit block.

Description

Radd et al.
Apr. 2, 1974 ROTATING HUB ASSEMBLY FOR A MINING CUTTER BIT Inventors: Frederick J. Radd; Donald H.
Oertle; Louis I-I. Wolfe, all of Ponca City, Okla.
Continental Oil Company, Ponca City, Okla.
Filed: Oct. 25, 1972 Appl. No.: 300,539
Assignee:
US. Cl 299/86, 175/334, 175/336,
175/338, 175/354, 175/371 Int. Cl. E21c 35/18 Field of Search 299/86; 175/338, 354, 371,
3,519,309 7/1970 Engle et al 299/86 Primary ExaminerErnest R. Purser Attorney, Agent, or Firm-William J. Miller [57] ABSTRACT A mounting assembly for a mining tool adapted to fit in a bit block consisting of a hub assembly having an axial opening therethrough of a size to journal a mining cutter bit. The bit block has a larger opening adapted to accept the hub assembly and permit rotation of the hub assembly in the bit block. The hub assembly extends over the bit block so that a seal can be mounted between the bit block and the hub assembly. A peripheralgroove is formed in the hub assembly'so that a screw can lock the hub assembly into the bit [56] References Cited block.
UNITED STATES PATENTS 3,498,677 3/1970 Morrow 299/86 5 Claims, 2 Drawing Figures so 52 +1; 1 2 o 1 Q 2| l 2 Q 52 x \g ATENTEUAPR 2 1974 FIG. 2
ROTATING HUB ASSEMBLY FOR A MINING CUTTER BIT PRIOR ART The closest patent relating to the hub assembly is the patent to T. J. Kniff, U.S. Pat. No. 3,499,685. This patent discloses a bit block having a sleeve mounted into the bit block and an axial opening in the sleeve adapted to hold and retain a cutter bit. The sleeve and the cutter bit are free to rotate. The principal purpose of the Kniff patent is to permit replacement of the shoulder support for the bit block. A secondary purpose is to permit rtation of the sleeve assembly as well as the cutter bit. There is no provision, however, in the aforementioned device for preventing the entrance of coal dust and other materials between the bearing surfaces causing binding of the bit and loss of rotation. Since bits are continuously washed with water, it is fairly easy to form a fine water-coal slurry which will enter most exposed bearing surfaces.
Various other means have been tried to insure bit rotation. Ridges or flutes have been made on the sides of the conical bits; and projections of various types have been welded or attached to the base of the cone. These measures increase the bit life; however, the bit life could be increased further if the rotation of the bit was insured.
BRIEF DESCRIPTION OF THE FIGURES FIG. 1 is a cross-sectional view of the hub assembly with the cutter bit in full view; and
FIG. 2 is a top view of FIG. 1 having a partial section through lines 22 of FIG. 1.
Referring to both FIGS. 1 and 2, a bit block is attached to a continuous mining machine belt 11 by means of a weld or other suitable attaching means 12. The bit block 10 has an axial opening 13 for receiving a rotatably journaling hub assembly generally referred to as 14. Hub assembly 14 essentially comprises a cylinder portion 15, a second cylinder portion 16 having a larger diameter than portion 15, a downwardly extending circumferential lip 17, and an axial opening 18 adapted to receive cutter bit 19. A plurality of impact arms 20 is attached normal to the surface of cylindrical portion 16. Axial opening 18 has a circumferential groove 21 adapted to receive a locking ring 22 having a plurality of dimples 23 which snap into circumferential groove 21 and retain the cutter bit in axial opening 18. The cutter bit is of the usual type having a shank 30, a removal groove 31, a conical tip 32, and a hardened tungsten carbide insert tip 33. Such bits are readily available on the market and, as such, will not be further discussed. Cylindrical portion has a circumferential groove 40 which mates with a threaded opening 41 having a bolt 42 therein. The tip 43 of bolt 42 fits into groove 40 and retains hub assembly 14 in axial opening 13. The seal assembly comprises a projection 50 on the bit block 10 which has a recess 51. Seal 52 fits into recess 51 and extends to the inside of the circumferential lip 17. Since the seal is fairly well restrained from movement, no means need be provided for anchoring the seal in recess 51. The space between bit block and cylindrical portion 15 may be lubricated by any suitable lubricant, such as grease, oil, graphite, or the like. In some instances it may be preferable to leave any form of lubricant out of the space, since, in spite of the seal, some dust may get into the lubricant, causing the hub assembly to bind to bit block 10 when the dust mixes with the lubricant. Operation Unlike the prior art, dust, dirt and water are prevented from entering the bearing surface between bit block 10 and cylindrical portion 15 by virtue of the seal 52. Any dirt or dust entering the passageway will be blocked effectively by the seal. The seal also provides for free rotation of the hub assembly. The cutter bit 19 is also free to rotate. If the hub assembly should bind, bolt 42 can be removed and the hub assembly lifted out and cleaned. The seal can also easily be replaced using the same procedure.
A second advantage is that, should the area around the shoulder of the cutter bit become damaged due to impacting of product, such as coal, the hub assembly can be removed; and a new one can be substituted without necessitating breaking the weld 12 and substituting an entire new bit block. The impacting arm 20 being formed on the cylindrical portion 16 provides a method of insuring rotation of the hub assembly. Since the impact arm 20 is mounted to the hub assembly, there is no need to provide additional impact arms on the cutter bit 19, thus reducing the cost of the cutter bit. Seal 52 may be made of any suitable seal material, such as rubber or one or more of the manufactured plastics.
A sealed hub assembly has been disclosed which will function in spite of the environmental contaminants in the region of the cutter bit. The seal assembly, furthermore, is easy to maintain.
It is obvious that modifications and changes can be made in the method of mounting the seal or seal materials and still be within the scope of the specification and appended claims.
What we claim is:
l. A mounting for a mining tool comprising:
a. a bit block;
b. a hub assembly having an axial opening therethrough of a size to journal a mining cutter bit;
c. means for rotatably journaling said hub assembly in said bit block; and d. seal means between said hub assembly and said bit block, whereby said hub assembly is free to rotate in said bit block, said seal means preventing the intrusion of dust particles on said bearing surface.
2. A mounting assembly as described in claim I wherein said hub assembly has a plurality of impact extensions formed normal to the surface of said hub as sembly.
3. A mounting assembly as described in claim 1 wherein said hub assembly contains a peripheral groove and wherein said bit block includes a screw means aligned with said peripheral groove for retaining said hub assembly in said bit block, yet permitting said hub assembly to rotate.
4. A hub assembly for a cutter bit comprising a bit block having an axial opening therein; a hub assembly having a cylindrical portion dimensioned to fit the axial opening in said bit block, said cylindrical portion having a length sufficient to extend from said axial opening, said portion extending from said axial opening having a circumferential lip, a circumferential seal; means for mounting said circumferential seal between said bit block and said circumferential lip; a peripheral groove in said cylindrical portion dimensioned to fit said axial opening in said bit block; retainer means mounted in 5. An assembly as described in claim 4 having a plusaid bit block and engaging said circumferential rality of impact arms mounted normal to the surface of groove; and an axial opening in said hub assembly of a said hub assembly.
size to receive said cutter bit.

Claims (5)

1. A mounting for a mining tool comprising: a. a bit block; b. a hub assembly having an axial opening therethrough of a size to journal a mining cutter bit; c. means for rotatably journaling said hub assembly in said bit block; and d. seal means between said hub assembly and said bit block, whereby said hub assembly is free to rotate in said bit block, said seal means preventing the intrusion of dust particles on said bearing surface.
2. A mounting assembly as described in claim 1 wherein said hub assembly has a plurality of impact extensions formed normal to the surface of said hub assembly.
3. A mounting assembly as described in claim 1 wherein said hub assembly contains a peripheral groove and wherein said bit block includes a screw means aligned with said peripheral groove for retaining said hub assembly in said bit block, yet permitting said hub assembly to rotate.
4. A hub assembly for a cutter bit comprising a bit block having an axial opening therein; a hub assembly having a cylindrical portion dimensioned to fit the axial opening in said bit block, said cylindrical portion having a length sufficient to extend from said axial opening, said portion extending from said axial opening having a circumferential lip, a circumferential seal; means for mounting said circumferential seal between said bit block and said circumferential lip; a peripheral groove in said cylindrical portion dimensioned to fit said axial opening in said bit block; retainer means mounted in said bit block and engaging said circumferential groove; and an axial opening in said hub assembly of a size to receive said cutter bit.
5. An assembly as described in claim 4 having a plurality of impact arms mounted normal to the surface of said hub assembly.
US00300539A 1972-10-25 1972-10-25 Rotating hub assembly for a mining cutter bit Expired - Lifetime US3801158A (en)

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Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4065185A (en) * 1976-07-22 1977-12-27 Elders G W Point-attack bit
FR2428735A1 (en) * 1978-06-15 1980-01-11 Voest Alpine Ag PIC ASSEMBLY AND PIC HOLDER FOR CLEANER TOOL
USRE30807E (en) * 1979-12-17 1981-12-01 Point-attack bit
US5131725A (en) * 1990-09-04 1992-07-21 Kennametal Inc. Rotatable cutting tool having an insert with flanges
US6341823B1 (en) 2000-05-22 2002-01-29 The Sollami Company Rotatable cutting tool with notched radial fins
US6354771B1 (en) 1998-12-12 2002-03-12 Boart Longyear Gmbh & Co. Kg Cutting or breaking tool as well as cutting insert for the latter
US6454360B1 (en) * 2000-10-10 2002-09-24 Sandvik Rock Tools, Inc. Ground-working tools for use in power rakes
WO2004092542A1 (en) * 2003-04-16 2004-10-28 Boart Longyear Gmbh & Co. Kg Hartmetallwerkzeug- Fabrik Cylindrical cutting body
US20080048484A1 (en) * 2006-08-11 2008-02-28 Hall David R Shank for an Attack Tool
US7380888B2 (en) * 2001-04-19 2008-06-03 Kennametal Inc. Rotatable cutting tool having retainer with dimples
US20090160238A1 (en) * 2007-12-21 2009-06-25 Hall David R Retention for Holder Shank
US20090200857A1 (en) * 2006-08-11 2009-08-13 Hall David R Manually Rotatable Tool
US20090267403A1 (en) * 2006-08-11 2009-10-29 Hall David R Resilient Pick Shank
CN101513706B (en) * 2009-04-01 2010-04-14 河南省煤科院耐磨技术有限公司 Method for processing wear-proof head separation prevention pickaxe type cutting pick
US20110080036A1 (en) * 2007-05-15 2011-04-07 Schlumberger Technology Corporation Spring Loaded Pick
US8201892B2 (en) 2006-08-11 2012-06-19 Hall David R Holder assembly
US8322796B2 (en) 2009-04-16 2012-12-04 Schlumberger Technology Corporation Seal with contact element for pick shield
WO2014022333A1 (en) * 2012-07-31 2014-02-06 Caterpillar Paving Products Inc. Milling drum tool holder
US8701799B2 (en) 2009-04-29 2014-04-22 Schlumberger Technology Corporation Drill bit cutter pocket restitution
US9458607B2 (en) 2010-04-06 2016-10-04 Kennametal Inc. Rotatable cutting tool with head portion having elongated projections
US9828742B2 (en) 2014-01-31 2017-11-28 Leroy G. Hagenbuch Cutter assembly with freewheeling cutting elements
CN109025988A (en) * 2018-08-28 2018-12-18 辽宁工程技术大学 A kind of novel dismountable continuous miner roller
US10233752B2 (en) * 2016-05-31 2019-03-19 Everpads Co., Ltd. Cutting tool holding mechanism
US10352163B2 (en) 2014-01-31 2019-07-16 Leroy G. Hagenbuch Cutter assembly with freewheeling cutting elements

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3498677A (en) * 1968-10-30 1970-03-03 Bowdil Co Cutting apparatus
US3519309A (en) * 1965-08-12 1970-07-07 Kennametal Inc Rotary cone bit retained by captive keeper ring

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3519309A (en) * 1965-08-12 1970-07-07 Kennametal Inc Rotary cone bit retained by captive keeper ring
US3498677A (en) * 1968-10-30 1970-03-03 Bowdil Co Cutting apparatus

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4065185A (en) * 1976-07-22 1977-12-27 Elders G W Point-attack bit
FR2428735A1 (en) * 1978-06-15 1980-01-11 Voest Alpine Ag PIC ASSEMBLY AND PIC HOLDER FOR CLEANER TOOL
USRE30807E (en) * 1979-12-17 1981-12-01 Point-attack bit
US5131725A (en) * 1990-09-04 1992-07-21 Kennametal Inc. Rotatable cutting tool having an insert with flanges
US6354771B1 (en) 1998-12-12 2002-03-12 Boart Longyear Gmbh & Co. Kg Cutting or breaking tool as well as cutting insert for the latter
US6341823B1 (en) 2000-05-22 2002-01-29 The Sollami Company Rotatable cutting tool with notched radial fins
US6454360B1 (en) * 2000-10-10 2002-09-24 Sandvik Rock Tools, Inc. Ground-working tools for use in power rakes
US7380888B2 (en) * 2001-04-19 2008-06-03 Kennametal Inc. Rotatable cutting tool having retainer with dimples
WO2004092542A1 (en) * 2003-04-16 2004-10-28 Boart Longyear Gmbh & Co. Kg Hartmetallwerkzeug- Fabrik Cylindrical cutting body
US8500209B2 (en) * 2006-08-11 2013-08-06 Schlumberger Technology Corporation Manually rotatable tool
US8449040B2 (en) 2006-08-11 2013-05-28 David R. Hall Shank for an attack tool
US20090200857A1 (en) * 2006-08-11 2009-08-13 Hall David R Manually Rotatable Tool
US20090267403A1 (en) * 2006-08-11 2009-10-29 Hall David R Resilient Pick Shank
US8500210B2 (en) 2006-08-11 2013-08-06 Schlumberger Technology Corporation Resilient pick shank
US20080048484A1 (en) * 2006-08-11 2008-02-28 Hall David R Shank for an Attack Tool
US8118371B2 (en) 2006-08-11 2012-02-21 Schlumberger Technology Corporation Resilient pick shank
US8201892B2 (en) 2006-08-11 2012-06-19 Hall David R Holder assembly
US8342611B2 (en) 2007-05-15 2013-01-01 Schlumberger Technology Corporation Spring loaded pick
US20110080036A1 (en) * 2007-05-15 2011-04-07 Schlumberger Technology Corporation Spring Loaded Pick
US20090160238A1 (en) * 2007-12-21 2009-06-25 Hall David R Retention for Holder Shank
US8292372B2 (en) 2007-12-21 2012-10-23 Hall David R Retention for holder shank
CN101513706B (en) * 2009-04-01 2010-04-14 河南省煤科院耐磨技术有限公司 Method for processing wear-proof head separation prevention pickaxe type cutting pick
US8322796B2 (en) 2009-04-16 2012-12-04 Schlumberger Technology Corporation Seal with contact element for pick shield
US8701799B2 (en) 2009-04-29 2014-04-22 Schlumberger Technology Corporation Drill bit cutter pocket restitution
US9458607B2 (en) 2010-04-06 2016-10-04 Kennametal Inc. Rotatable cutting tool with head portion having elongated projections
US8911024B2 (en) 2012-07-31 2014-12-16 Caterpillar Paving Products Inc. Milling drum tool holder
WO2014022333A1 (en) * 2012-07-31 2014-02-06 Caterpillar Paving Products Inc. Milling drum tool holder
US9828742B2 (en) 2014-01-31 2017-11-28 Leroy G. Hagenbuch Cutter assembly with freewheeling cutting elements
US10352163B2 (en) 2014-01-31 2019-07-16 Leroy G. Hagenbuch Cutter assembly with freewheeling cutting elements
US10233752B2 (en) * 2016-05-31 2019-03-19 Everpads Co., Ltd. Cutting tool holding mechanism
CN109025988A (en) * 2018-08-28 2018-12-18 辽宁工程技术大学 A kind of novel dismountable continuous miner roller

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AS Assignment

Owner name: CONSOLIDATION COAL COMPANY, A CORP OF DE.

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. SUBJECT TO LICENSE RECITED;ASSIGNOR:CONOCO, INC.;REEL/FRAME:004923/0180

Effective date: 19870227

AS Assignment

Owner name: C0NSOLIDATION COAL COMPANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CONOCO INC., A CORP. OF DE.;REEL/FRAME:004912/0683

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Owner name: C0NSOLIDATION COAL COMPANY, A CORP. OF DE.

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CONOCO INC., A CORP. OF DE.;REEL/FRAME:004912/0683

Effective date: 19870227