US3904247A - Bit assembly - Google Patents

Bit assembly Download PDF

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Publication number
US3904247A
US3904247A US400412A US40041273A US3904247A US 3904247 A US3904247 A US 3904247A US 400412 A US400412 A US 400412A US 40041273 A US40041273 A US 40041273A US 3904247 A US3904247 A US 3904247A
Authority
US
United States
Prior art keywords
screw
bit
end wall
holder
head
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
US400412A
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English (en)
Inventor
Berthold Ostrop
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.)
Gewerkschaft Eisenhutte Westfalia GmbH
Original Assignee
Gewerkschaft Eisenhutte Westfalia GmbH
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 Gewerkschaft Eisenhutte Westfalia GmbH filed Critical Gewerkschaft Eisenhutte Westfalia GmbH
Application granted granted Critical
Publication of US3904247A publication Critical patent/US3904247A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C27/00—Machines which completely free the mineral from the seam
    • E21C27/20—Mineral freed by means not involving slitting
    • E21C27/32—Mineral freed by means not involving slitting by adjustable or non-adjustable planing means with or without loading arrangements
    • E21C27/44—Planing knives

Definitions

  • FIG] BIT ASSEMBLY BACKGROUND OF THE INVENTION
  • Bit assemblies for coal ploughs and the like which comprise a holder or housing which defines a cavity in which a root part of the bit or tool is received.
  • the bit may have a projection which hooks into a recess in an end wall of the holder while the other end of the bit is held in place by a releasable securing device.
  • 1,291,708 discloses a bit as sembly of this type in which the bit is held in place at the other end of the holder by a lining piece which is inserted in an aperture in the wall at that end and engages between the wall and a projection on the bit and by a clamping pin which is driven through a bore in the lining piece and into a bore in the bit.
  • the object of this invention is to overcome this problem and provide for a bit assembly of this type a securing device which is simple to construct, easy to handle and is removable without any particular difficulty even when equipment has been left standing idle for some time.
  • the securing device takes the form of a cap screw which can be screwed through an aperture in the end wall of the holder and into a screw-threaded bore in the bit.
  • the head of the cap screw which is preferably cylindrical with a diameter substantially greater than that of the shank, bears against the surface of the end wall defining the aperture and retains the bit in the cavity.
  • the screw head may be provided with a polygonal recess, more usually a hexagonal recess, to receive a suitable tool.
  • the bit may be retained by a screw having a strong cylindrical head which is at least partly countersunk in the aperture in the end wall, the head of the screw acting as a projection interfitting with the wall.
  • the end wall of the holder is formed with a narrow rib, ridge or shoulder which projects into the aperture and acts as a support surface for the side of the screw head.
  • This support surface is in line with the point through which pass at least the major forces which are transmitted to the screw head from the holder or bit.
  • this unthreaded portion may include a frusto-conical shoulder which bears against a complementary dished recess at the bore mouth.
  • the forces transmitted to the screw head from the narrow shoulder and the dished recess may be arranged to intersect at a point on, or adjacent to, the screw axis, the stress suffered by the screw will be confined to the axial direction, that is, will constitute tractive stress, despite the fact that the head of the screw will be subjected to transverse loads.
  • the screw connection provided by the invention is particularly suited to retaining bits in bit holders such as are used in coal ploughs and other mining equipment. It can, however, also have other applications in any field in which there is desired a screw connection which will not suffer bending stress. The invention is therefore not confined to the mining field.
  • FIG. I is a partial section taken through a bit holder showing a bit in place therein
  • FIG. 2 is an end elevation of the assembly shown in FIG. 1.
  • a cutter bit assembly for a coal plough consists of a bit holder 10 having a cavity or compartment 12 opening towards the coal face and into which the root part of a plate-like blade part, tool or bit 11 is received.
  • the bit holder may have a conical shank for insertion in a boring of complementary shape in the body of the plough or in a bit carrier.
  • the bit 11 has a tip which may be made up from hard metal inserts 13.
  • the body of the bit holder is cut away to form a recess 15 which constitutes an extension to the compartment l2 and receives a projection 14 on the root part of the bit housed within the compartment.
  • the projection I4 therefore hooks around the rear side of the wall I6 of the bit holder.
  • the bit I1 is inserted into the com partment and the projection 14 mated with the recess 15. The bit is then pivoted around the projection (in the direction of arrow S) into the position illustrated. To permit the bit to be pivoted in this way, the wall 16 is cut away or bevelled at 17 and a slight clearance 18 is left between the opposite wall 19 and the part of the bit which lies proximate to it.
  • the wall 19 is provided with an aperture 20 which accommodates the head 22 of a cap screw 21 which is screwed into a screw threaded bore 22' in the root part of the bit and serves to retain the latter in place within the compartment.
  • the head 22 is cylindrical and has a hexagonal recess 23 for an appropriately shaped tool.
  • the diameter of the head 22 is substantially greater than that of the screw shank 24 and is separated therefrom by an unthreaded portion which includes a frusto-conical section 25 and a cylindrical section 27 which has a diameter somewhat greater than the outer diameter of the threaded shank.
  • the frustoconical section bears against a complementary surface 26 at the mouth of the bore while the cylindrical section 27 fits within a cylindrically enlarged portion of the bore. This unthreaded portion serves to seal the bore against the ingress of moisture.
  • the aperture in the wall 19 is generally U-shaped and the circular sectioned part and parts of the tangential flat parts of the circumference of the aperture have a narrow support rib or shoulder 28 which bears against and supports the screw head over an arc of about 180.
  • the screw is inserted and tightened, whereby the bit is retained in place.
  • the head of the screw is situated in a partially countersunk position within the aperture 20 (it may of course, in a modification. be completely countersunk) and is supported against the frustoconical surface 26 and the narrow shoulder 28.
  • the screw and its supporting surfaces are so dimensioned and located relative to each other that the forces acting on the screw, namely the transverse force Z transmitted to the head of the screw from the shoulder 28, the oblique forces transmitted to the screw from the surface 26 and the axial force Y, will intersect at a point M disposed substantially on the screw axis.
  • a bit assembly comprising:
  • a hollow bit holder having top and bottom walls, side walls and end walls, one of said end walls having an aperture therein communicating with the hollow interior of said holder, said bottom wall having an opening therein communicating with the hollow interior of said holder;
  • a tool bit having a root portion inserted through the bottom wall opening into the hollow interior of said bit holder, said root portion having retaining means thereon for interacting with said bit holder support member, said root portion having an internally threaded bore which is axially aligned with the end wall aperture, said bore having its opening countersunk;
  • said one end wall shoulder, said screw head, said countersunk bore opening, and said frusto-conical screw surface all being arranged relative to each other whereby forces transmitted to said screw head intersect at a point on the axis of said screw.

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)
  • Earth Drilling (AREA)
  • Knives (AREA)
US400412A 1972-09-14 1973-09-24 Bit assembly Expired - Lifetime US3904247A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2244977A DE2244977C3 (de) 1972-09-14 1972-09-14 Meißel, insbesondere für Kohlenhobel u.dgl

Publications (1)

Publication Number Publication Date
US3904247A true US3904247A (en) 1975-09-09

Family

ID=5856240

Family Applications (1)

Application Number Title Priority Date Filing Date
US400412A Expired - Lifetime US3904247A (en) 1972-09-14 1973-09-24 Bit assembly

Country Status (7)

Country Link
US (1) US3904247A (de)
BE (1) BE795710A (de)
CS (1) CS212290B2 (de)
DE (1) DE2244977C3 (de)
FR (1) FR2230853B1 (de)
GB (1) GB1433164A (de)
PL (1) PL84151B1 (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4280735A (en) * 1977-11-08 1981-07-28 Gewerkschaft Eisenhutte Westfalia Non-rotary mining cutter with recessed nozzle insert
US4512612A (en) * 1982-07-21 1985-04-23 Eurotungstene System for mounting tooth-carrier sectors on a cutter wheel or a milling-cutter drum
US4637658A (en) * 1984-09-11 1987-01-20 Wolfgang Annipajo Cutters for use in mineral mining
US4679639A (en) * 1983-12-03 1987-07-14 Nl Petroleum Products Limited Rotary drill bits and cutting elements for such bits
US4776639A (en) * 1986-12-10 1988-10-11 Halbach & Braun Industrieanlagen Tool assembly for mining machines, coal planes and coal cutting machines
US4998778A (en) * 1989-01-04 1991-03-12 Halbach & Braun Industrieanlagen Mining tool including a chisel and a chisel holder
US5678645A (en) * 1995-11-13 1997-10-21 Baker Hughes Incorporated Mechanically locked cutters and nozzles
US5983534A (en) * 1997-09-17 1999-11-16 G. H. Hensley Industries, Inc. Rotary lock system for excavating tooth/adapter assembly
US20050150666A1 (en) * 2002-05-15 2005-07-14 Bernd Holl Fixing device for a shank chisel

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3122868C2 (de) * 1981-06-10 1986-06-26 Gewerkschaft Eisenhütte Westfalia, 4670 Lünen Hobelmeißelbefestigung, insbesondere für Kohlenhobel

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1595112A (en) * 1925-09-23 1926-08-10 Stockland Road Machinery Compa Scarifying device
US2190674A (en) * 1936-01-21 1940-02-20 Sullivan Machinery Co Cutter chain
US3271080A (en) * 1964-02-06 1966-09-06 Gen Electric Cutter bit assembly for mining machines

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1595112A (en) * 1925-09-23 1926-08-10 Stockland Road Machinery Compa Scarifying device
US2190674A (en) * 1936-01-21 1940-02-20 Sullivan Machinery Co Cutter chain
US3271080A (en) * 1964-02-06 1966-09-06 Gen Electric Cutter bit assembly for mining machines

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4280735A (en) * 1977-11-08 1981-07-28 Gewerkschaft Eisenhutte Westfalia Non-rotary mining cutter with recessed nozzle insert
US4512612A (en) * 1982-07-21 1985-04-23 Eurotungstene System for mounting tooth-carrier sectors on a cutter wheel or a milling-cutter drum
US4679639A (en) * 1983-12-03 1987-07-14 Nl Petroleum Products Limited Rotary drill bits and cutting elements for such bits
US4637658A (en) * 1984-09-11 1987-01-20 Wolfgang Annipajo Cutters for use in mineral mining
US4776639A (en) * 1986-12-10 1988-10-11 Halbach & Braun Industrieanlagen Tool assembly for mining machines, coal planes and coal cutting machines
US4998778A (en) * 1989-01-04 1991-03-12 Halbach & Braun Industrieanlagen Mining tool including a chisel and a chisel holder
US5678645A (en) * 1995-11-13 1997-10-21 Baker Hughes Incorporated Mechanically locked cutters and nozzles
US5906245A (en) * 1995-11-13 1999-05-25 Baker Hughes Incorporated Mechanically locked drill bit components
US5983534A (en) * 1997-09-17 1999-11-16 G. H. Hensley Industries, Inc. Rotary lock system for excavating tooth/adapter assembly
US20050150666A1 (en) * 2002-05-15 2005-07-14 Bernd Holl Fixing device for a shank chisel
US7086704B2 (en) * 2002-05-15 2006-08-08 Wirtgen Gmbh Fixing device for a shank chisel

Also Published As

Publication number Publication date
PL84151B1 (de) 1976-03-31
GB1433164A (en) 1976-04-22
CS212290B2 (en) 1982-03-26
DE2244977A1 (de) 1974-03-21
FR2230853B1 (de) 1976-09-10
DE2244977C3 (de) 1981-01-08
BE795710A (fr) 1973-06-18
DE2244977B2 (de) 1980-04-30
FR2230853A1 (de) 1974-12-20

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