CA2076437A1 - Tools - Google Patents
ToolsInfo
- Publication number
- CA2076437A1 CA2076437A1 CA002076437A CA2076437A CA2076437A1 CA 2076437 A1 CA2076437 A1 CA 2076437A1 CA 002076437 A CA002076437 A CA 002076437A CA 2076437 A CA2076437 A CA 2076437A CA 2076437 A1 CA2076437 A1 CA 2076437A1
- Authority
- CA
- Canada
- Prior art keywords
- ring
- tool
- insert
- aperture
- tool according
- 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.)
- Abandoned
Links
- 239000000463 material Substances 0.000 claims abstract description 21
- 238000005520 cutting process Methods 0.000 claims abstract description 11
- 238000005219 brazing Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims 1
- 230000009969 flowable effect Effects 0.000 claims 1
- 230000002093 peripheral effect Effects 0.000 claims 1
- 239000002184 metal Substances 0.000 description 16
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000005245 sintering Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 230000002028 premature Effects 0.000 description 2
- 229910052582 BN Inorganic materials 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000012217 deletion Methods 0.000 description 1
- 230000037430 deletion Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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
- E21C35/183—Mining picks; Holders therefor with inserts or layers of wear-resisting material
-
- 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
Abstract
Abstract of the Disclosure A breaking or excavating tool has a cutting insert mounted at the forward end of a tool body which is made of a softer material than the insert. A separately formed ring, made of harder material than the body is brazed to a front face of the body surrounding the insert to protect the tool body against wear.
Description
TOOL COMP~I~ED OF A ~IOLDER BODY
AND A l~a~!D IN~:ERT AND ~ 0D
OF M~ING 8AME
FIELD OF THE INVENTION
This invention relates to tools for breakiny or excavating, such as for mineral cutting, which comprise a working insert of a harder material projecting from a hole at the tapered front end of a body of the tool, typically of steel.
Backqround of the Invention Tools for breaking or excavating with worXing inserts of hard metal have been produced in con~igurations (e.g., see European Publication No. 122 893) which have a lower energy consumption for a given operating capability.
Although the front tip o~ the insert is intended to provide the cutting or breaking action in these low energy tools, the softer material of the body exposed to impact or abrasion during operation of the tool can suffer wear and damage, one result o~ which is to weaken the attachment of the insert. The tool then fails prematurely because the insert has been dislodged.
As regards the forms of tool illustrated in European Publication 122 893, this kind of problem is more likely to be encountered when the insert is a simple cylinder with a~conical tip. Other insert forms shown in that patent have conical portions much larger than the hole into which the insert fits, so that the outer regions of these conical portions provide protection for the . : .
:
.
.
forward end of the body. However, these alternative hard metal inserts are mvre difficult to produce, because their complex shapes are not well adapted to the pressure sintering method that must be used. They also require substantially more hard metal.
In Soviet Patent 8~9916 it has been proposed to form the hard metal insert with a larye disc-like skirt intermediate its length so that when the cylindrical rear end of the insert is placed in a fitting bore in the front of the tool body the skirt covers the front face around the boreO This requires less material than the large conical portions of the inserts shown in European Publication 122 893, but the shape cannot be formed satisfactorily by sintering, because the very high sintering pressures demanded cannot be applied evenly and the insert will have weaknesses tending to produce premature failure.
German Patents No. 24 42 146 and No. 30 05 685 show tools in which the front portion of the tool body is composed of a matrix containing hard metal. This does not overcome the problem of wear because the softer mass of steel in which the hard metal is held is exposed and although the hard metal particles may not wear they will be dislodged as the steel wears. A greater concentration of hard metal in the matrix to avoid this disadvantage would lead to increased material costs without simplifying the manufacture of the tool.
The tool disclosed in British Patent 2,004,315 has, on the outer circumference of the leading end of its body, a cylindrical ring of hard metal serving as reinforcement for the body, but the metal body between the ring and the in~ert is still exposed to wear.
Furthermore, to the extent that the outer ring functions~
to protect the tool against abrasion, it is not possible to use this solution to manufacture a so-called low-energy tool because the ring will only have this low energy effect if the entire front end of the tool participates in the cutting or breaking action.
Finally, there ~ay be mentioned examples of tools which can be considered analogous to that in British Patent 2,004,315 in that, instead of the outer ring of hard metal, there is provided a layer of hard metal extending as a complete sheath over at least the ~orward portion of the shank. One example is to be found in U.S.
Patent 4,682,9g7 in which the hard metal is applied as a fused coating to the shank, clearly a rather complicated and expensive solution. U.S. Patent 3,627,387 shows another example in which a considerably thicker sheath of hard metal is provided, adding to the cost of the tool.
Summary of the Invention According to the present invention, there is provided a tool comprising a working insert having a body portion held in an aperture in the forward end of a body of the tool and a tapered forward tip projecting from said aperture, a separately formed ring surrounding said body portion of the insert and covering a front face of the tool body, said insert and ring both being secured in position on the tool body and being formed from a harder material than the tool body.
Preferably there is some radial clearance between the ring and the insert. One function of such a clearance would be to simplify not only the assembly but also the securing of the ring and insert in place.
.
Thus, if they are secured by brazing, it is possible to place the brazi~g alloy in the tool body aperture, the radial clearance allowing the brazing material from the aperture to flow into contact with the ring and simultaneously secure both parts in place.
The ring may take a variety of forms. A flat annular shape has particular advantages in simplicity of production; prior to sintering the individual rings can be formed simply by cutting them from an extruded tube of the lo material. It is not necessary that it is a clos~d ring, however and it may be prePerred to make it up from a number of segments, particularly if a form other than the flat annular form is required.
The insert may also be given a variety of forms, as regards both the exposed cutting tip and the body portion disposed within the main body of the tool.
Generally, the cutting tip will have a rotationally ~ymmetrical form but it may be conical or spherical for example. A generally cylindrical form may be most convenient for the body portion but not necessarily of circular cross-section.
The invention will be described in more detail by way of example with reference to the accompanying drawing.
Brief Description of the Drawinas The objects and advantages of the invention will become apparent from the following detailed description of a preferred embodiment thereo~ in connection with the accompanying drawings in which like numerals designate like elements and in which:
FIG. 1 shows a tool according to the invention in a partly sectioned side view;
FIG. 2 is an enlarged fra~mentary view of FIG. 1;
and FIG. 3 is a view similar to FIG. 2 depicting an alternate embodiment of the ring.
Description of the Preferred Embodiment of the Invention The main body 2 of the tool is entirely conventional, being made of steel with a centr~l cylindrical shank 4 which locates the tool rotatably in a bore o~ a holder (not shown). That is, the tool rotates freely about its longitudinal axis. A shoulder 6 at the forward end of the shank 4 provides an abutment face 8 limiting the insertion of the tool into the bore. A
reduced diameter rear portion 10 of the shank serves for mounting a locking ring (not shown) to retain the tool in the bore.
At its forward end the tool body 2 has a tapered front portion 12 in which a central circular bore 14 recei~es a hard metal cutting insert 20 comprising a main cylindrical portion 22 projecting from the bore and a generally conical tip 24. The tool body has a flat annular face 16 surrounding the bore 14 and that face is covered by a separate hard metal ring 30 of flat rectangular cross-section. The ring outer diameter is chosen such that a line T tangential to the tapered tip and the periphery of the ring lies at an angle ~ to the longi~udinal axis L of the tool, which angle is greater than the angle B formed by the axis L and an extension E
o~ the tapered outer surface 12A o~ the tool body located immediately behind the ring so that the body lies within the conical envelope defined by the tangential line T.
.:
., ~' , That is, the line T intersects each of: (i) the outer periphery of the tapered tip 24, (ii) an outer edge of a forwardly facing surface 30A of the ring, and (iii) the axis L. To avoid premature wear of the ring, however, the angle ~ is preferably not substantially greater than about 40. There is a small radial clearance C, e.g., not substantially more than 0.5mm, and preferably not substantially more than O.~mm, between insert 20 and ring 30.
The insert and ring are secured to the tool body by brazing. Brazing material (not shown) placed in the bore 14 before the insert 20 is melted and i5 able to flow up the sides of the bore and into a first interface between the insert 20 and ring 30 and simultaneously into a second interface between the ring 30 and body 2. In this way, both parts 20,30 are brazed simultaneously to the tool body.
In use, the ring serves as a simple and economical shield over the most exposed part of the tool body to reduce the wear around the insert and so prolong the life of the tool. By shielding the metal of the body from direct impact with the surface being worked, e.g., in rock cutting, the tool can also reduce the possibility of sparks being ge~era~ed.
Depending upon the intended use, the ring may be given different forms but it is always made as a separate one piece or multi-piece part to be assembled with the insert on the shank. For particular uses the insert and ring may be made of other materials, such as cubic boron nitride or polycrystalline diamond, including composites of two or more materials, and the insert and ring can be made of different materials from each other to reflect their different functions.
Instead of being flat, a ring 30' could have a concave forward surface 40 as depicted in FIG. 3.
Although the present invention has been described in connection with pre~erred embodiments thereof, it will be appreciated by those skilled in the art that additions, modifications, substitutions, and deletions not specifically described may be made without departing from the spirit and scope of the invention ag defined in the appended claims.
WXAT IS CLAI~ED IS:
, :
~, ,
AND A l~a~!D IN~:ERT AND ~ 0D
OF M~ING 8AME
FIELD OF THE INVENTION
This invention relates to tools for breakiny or excavating, such as for mineral cutting, which comprise a working insert of a harder material projecting from a hole at the tapered front end of a body of the tool, typically of steel.
Backqround of the Invention Tools for breaking or excavating with worXing inserts of hard metal have been produced in con~igurations (e.g., see European Publication No. 122 893) which have a lower energy consumption for a given operating capability.
Although the front tip o~ the insert is intended to provide the cutting or breaking action in these low energy tools, the softer material of the body exposed to impact or abrasion during operation of the tool can suffer wear and damage, one result o~ which is to weaken the attachment of the insert. The tool then fails prematurely because the insert has been dislodged.
As regards the forms of tool illustrated in European Publication 122 893, this kind of problem is more likely to be encountered when the insert is a simple cylinder with a~conical tip. Other insert forms shown in that patent have conical portions much larger than the hole into which the insert fits, so that the outer regions of these conical portions provide protection for the . : .
:
.
.
forward end of the body. However, these alternative hard metal inserts are mvre difficult to produce, because their complex shapes are not well adapted to the pressure sintering method that must be used. They also require substantially more hard metal.
In Soviet Patent 8~9916 it has been proposed to form the hard metal insert with a larye disc-like skirt intermediate its length so that when the cylindrical rear end of the insert is placed in a fitting bore in the front of the tool body the skirt covers the front face around the boreO This requires less material than the large conical portions of the inserts shown in European Publication 122 893, but the shape cannot be formed satisfactorily by sintering, because the very high sintering pressures demanded cannot be applied evenly and the insert will have weaknesses tending to produce premature failure.
German Patents No. 24 42 146 and No. 30 05 685 show tools in which the front portion of the tool body is composed of a matrix containing hard metal. This does not overcome the problem of wear because the softer mass of steel in which the hard metal is held is exposed and although the hard metal particles may not wear they will be dislodged as the steel wears. A greater concentration of hard metal in the matrix to avoid this disadvantage would lead to increased material costs without simplifying the manufacture of the tool.
The tool disclosed in British Patent 2,004,315 has, on the outer circumference of the leading end of its body, a cylindrical ring of hard metal serving as reinforcement for the body, but the metal body between the ring and the in~ert is still exposed to wear.
Furthermore, to the extent that the outer ring functions~
to protect the tool against abrasion, it is not possible to use this solution to manufacture a so-called low-energy tool because the ring will only have this low energy effect if the entire front end of the tool participates in the cutting or breaking action.
Finally, there ~ay be mentioned examples of tools which can be considered analogous to that in British Patent 2,004,315 in that, instead of the outer ring of hard metal, there is provided a layer of hard metal extending as a complete sheath over at least the ~orward portion of the shank. One example is to be found in U.S.
Patent 4,682,9g7 in which the hard metal is applied as a fused coating to the shank, clearly a rather complicated and expensive solution. U.S. Patent 3,627,387 shows another example in which a considerably thicker sheath of hard metal is provided, adding to the cost of the tool.
Summary of the Invention According to the present invention, there is provided a tool comprising a working insert having a body portion held in an aperture in the forward end of a body of the tool and a tapered forward tip projecting from said aperture, a separately formed ring surrounding said body portion of the insert and covering a front face of the tool body, said insert and ring both being secured in position on the tool body and being formed from a harder material than the tool body.
Preferably there is some radial clearance between the ring and the insert. One function of such a clearance would be to simplify not only the assembly but also the securing of the ring and insert in place.
.
Thus, if they are secured by brazing, it is possible to place the brazi~g alloy in the tool body aperture, the radial clearance allowing the brazing material from the aperture to flow into contact with the ring and simultaneously secure both parts in place.
The ring may take a variety of forms. A flat annular shape has particular advantages in simplicity of production; prior to sintering the individual rings can be formed simply by cutting them from an extruded tube of the lo material. It is not necessary that it is a clos~d ring, however and it may be prePerred to make it up from a number of segments, particularly if a form other than the flat annular form is required.
The insert may also be given a variety of forms, as regards both the exposed cutting tip and the body portion disposed within the main body of the tool.
Generally, the cutting tip will have a rotationally ~ymmetrical form but it may be conical or spherical for example. A generally cylindrical form may be most convenient for the body portion but not necessarily of circular cross-section.
The invention will be described in more detail by way of example with reference to the accompanying drawing.
Brief Description of the Drawinas The objects and advantages of the invention will become apparent from the following detailed description of a preferred embodiment thereo~ in connection with the accompanying drawings in which like numerals designate like elements and in which:
FIG. 1 shows a tool according to the invention in a partly sectioned side view;
FIG. 2 is an enlarged fra~mentary view of FIG. 1;
and FIG. 3 is a view similar to FIG. 2 depicting an alternate embodiment of the ring.
Description of the Preferred Embodiment of the Invention The main body 2 of the tool is entirely conventional, being made of steel with a centr~l cylindrical shank 4 which locates the tool rotatably in a bore o~ a holder (not shown). That is, the tool rotates freely about its longitudinal axis. A shoulder 6 at the forward end of the shank 4 provides an abutment face 8 limiting the insertion of the tool into the bore. A
reduced diameter rear portion 10 of the shank serves for mounting a locking ring (not shown) to retain the tool in the bore.
At its forward end the tool body 2 has a tapered front portion 12 in which a central circular bore 14 recei~es a hard metal cutting insert 20 comprising a main cylindrical portion 22 projecting from the bore and a generally conical tip 24. The tool body has a flat annular face 16 surrounding the bore 14 and that face is covered by a separate hard metal ring 30 of flat rectangular cross-section. The ring outer diameter is chosen such that a line T tangential to the tapered tip and the periphery of the ring lies at an angle ~ to the longi~udinal axis L of the tool, which angle is greater than the angle B formed by the axis L and an extension E
o~ the tapered outer surface 12A o~ the tool body located immediately behind the ring so that the body lies within the conical envelope defined by the tangential line T.
.:
., ~' , That is, the line T intersects each of: (i) the outer periphery of the tapered tip 24, (ii) an outer edge of a forwardly facing surface 30A of the ring, and (iii) the axis L. To avoid premature wear of the ring, however, the angle ~ is preferably not substantially greater than about 40. There is a small radial clearance C, e.g., not substantially more than 0.5mm, and preferably not substantially more than O.~mm, between insert 20 and ring 30.
The insert and ring are secured to the tool body by brazing. Brazing material (not shown) placed in the bore 14 before the insert 20 is melted and i5 able to flow up the sides of the bore and into a first interface between the insert 20 and ring 30 and simultaneously into a second interface between the ring 30 and body 2. In this way, both parts 20,30 are brazed simultaneously to the tool body.
In use, the ring serves as a simple and economical shield over the most exposed part of the tool body to reduce the wear around the insert and so prolong the life of the tool. By shielding the metal of the body from direct impact with the surface being worked, e.g., in rock cutting, the tool can also reduce the possibility of sparks being ge~era~ed.
Depending upon the intended use, the ring may be given different forms but it is always made as a separate one piece or multi-piece part to be assembled with the insert on the shank. For particular uses the insert and ring may be made of other materials, such as cubic boron nitride or polycrystalline diamond, including composites of two or more materials, and the insert and ring can be made of different materials from each other to reflect their different functions.
Instead of being flat, a ring 30' could have a concave forward surface 40 as depicted in FIG. 3.
Although the present invention has been described in connection with pre~erred embodiments thereof, it will be appreciated by those skilled in the art that additions, modifications, substitutions, and deletions not specifically described may be made without departing from the spirit and scope of the invention ag defined in the appended claims.
WXAT IS CLAI~ED IS:
, :
~, ,
Claims (13)
1. A tool comprising a tool body having a forward end; an aperture disposed in said forward end;
an insert comprising a body portion received in said aperture and a tapered tip projecting forwardly from said aperture; said forward end including a front face situated adjacent said aperture; a separately formed ring lying over said front face and surrounding said body portion of said insert, said insert and ring both each being secured in position on said tool body and being formed from a harder material than said tool body.
an insert comprising a body portion received in said aperture and a tapered tip projecting forwardly from said aperture; said forward end including a front face situated adjacent said aperture; a separately formed ring lying over said front face and surrounding said body portion of said insert, said insert and ring both each being secured in position on said tool body and being formed from a harder material than said tool body.
2. A tool according to Claim 1, wherein a radial clearance is formed between said ring and said insert.
3. A tool according to Claim 2, wherein said insert and said ring are secured to said tool body by brazing material, some of which lies in said radial clearance.
4. A tool according to Claim 2, wherein said clearance is not greater than about 0.5mm.
5. A tool according to Claim 2, wherein said clearance is not greater than about 0.2mm.
6. A tool according to Claim 1, wherein said ring has a flat annular shape.
7. A tool according to Claim 1, wherein said front face of said tool body receiving said ring has a flat annular form.
8. A tool according to Claim 1, wherein said ring includes a front surface of concave shape.
9. A tool according to Claim 1, wherein a line tangential to both said tapered tip and said ring lies at an angle of inclination to a longitudinal axis of the tool; an outer periphery of said tool body located immediately rearwards of said ring lying at a lesser angle of inclination to said axis than said tangential line.
10. A tool according to Claim 1, wherein a first line intersecting each of said outer periphery of said tapered tip, an outer peripheral edge of a forwardly facing surface of said ring, and a longitudinal axis of the tool forms a first angle with said axis; an outer periphery of said tool body located immediately rearwardly of said ring forming a second angle with said axis, said first angle being larger than said second angle.
11. A tool according to Claim 1, wherein the material from which said ring is formed is different from the material from which said insert is formed.
12. A tool according to Claim 1, wherein said ring is of one-piece construction.
13. A method of making a tool, comprising the steps of:
providing a tool body having a front face and an aperture formed in said front face;
inserting onto said front face a separately formed ring formed of a harder material than said tool body, said ring surrounding said aperture;
providing in said aperture a brazing material in a flowable state; and inserting into said aperture a rear body portion of a cutting insert formed of a harder material than said tool body such that said body portion forces said brazing material to flow out of said aperture and into a first interface formed between said front face and said ring, and into a second interface formed between an outer periphery of said insert and an inner periphery of said ring for securing both said insert and said ring to said tool body, with a tapered cutting tip of said insert projecting forwardly of said aperture.
providing a tool body having a front face and an aperture formed in said front face;
inserting onto said front face a separately formed ring formed of a harder material than said tool body, said ring surrounding said aperture;
providing in said aperture a brazing material in a flowable state; and inserting into said aperture a rear body portion of a cutting insert formed of a harder material than said tool body such that said body portion forces said brazing material to flow out of said aperture and into a first interface formed between said front face and said ring, and into a second interface formed between an outer periphery of said insert and an inner periphery of said ring for securing both said insert and said ring to said tool body, with a tapered cutting tip of said insert projecting forwardly of said aperture.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9117993.7 | 1991-08-20 | ||
| GB919117993A GB9117993D0 (en) | 1991-08-20 | 1991-08-20 | Tools |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2076437A1 true CA2076437A1 (en) | 1993-02-21 |
Family
ID=10700272
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002076437A Abandoned CA2076437A1 (en) | 1991-08-20 | 1992-08-19 | Tools |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPH06212875A (en) |
| AU (1) | AU661005B2 (en) |
| CA (1) | CA2076437A1 (en) |
| DE (1) | DE4226976A1 (en) |
| GB (2) | GB9117993D0 (en) |
| ZA (1) | ZA925913B (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19821147C2 (en) * | 1998-05-12 | 2002-02-07 | Betek Bergbau & Hartmetall | Attack cutting tools |
| US7204560B2 (en) * | 2003-08-15 | 2007-04-17 | Sandvik Intellectual Property Ab | Rotary cutting bit with material-deflecting ledge |
| AU2004201284B2 (en) | 2004-03-26 | 2008-12-18 | Sandvik Intellectual Property Ab | Rotary cutting bit |
| AU2005203762B2 (en) | 2005-08-22 | 2010-12-02 | Sandvik Intellectual Property Ab | Rotary cutting pick |
| AU2006252152B2 (en) | 2006-12-20 | 2009-12-10 | Sandvik Intellectual Property Ab | Rotary cutting pick |
| DE102007047215A1 (en) | 2007-10-02 | 2011-02-17 | David Guitelmakher | Mountain cutting tool useful as chisels and drill bits for mining extraction machines, comprises carbide cutting inserts, where the tool is produced by casting in a casting mold with the target of increasing the wear resistance |
| DE202008007212U1 (en) | 2008-05-29 | 2008-11-27 | Guitelmakher, David | Mount cutting tool |
| US9028009B2 (en) | 2010-01-20 | 2015-05-12 | Element Six Gmbh | Pick tool and method for making same |
| DE102015101063A1 (en) * | 2015-01-26 | 2016-07-28 | Betek Gmbh & Co. Kg | Chisel, in particular round shank chisel |
| US11512456B2 (en) * | 2018-04-13 | 2022-11-29 | Caterpillar Inc. | Arcuate bit surface and blade assembly |
| DE102018119928A1 (en) * | 2018-08-16 | 2020-02-20 | Hartmetall-Werkzeugfabrik Paul Horn Gmbh | thread milling |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2442146C2 (en) * | 1974-09-03 | 1982-09-23 | Fried. Krupp Gmbh, 4300 Essen | Pick for removing minerals and process for its manufacture |
| DE3005684A1 (en) * | 1980-02-15 | 1981-08-20 | Fried. Krupp Gmbh, 4300 Essen | Chisel for rocks or minerals - esp. coal, ores, salt, and soft to medium hard stone, where chisel tip made of tungsten carbide is inserted in composite hard material |
-
1991
- 1991-08-20 GB GB919117993A patent/GB9117993D0/en active Pending
-
1992
- 1992-08-04 AU AU20781/92A patent/AU661005B2/en not_active Expired
- 1992-08-04 GB GB9216537A patent/GB2258876B/en not_active Expired - Lifetime
- 1992-08-06 ZA ZA925913A patent/ZA925913B/en unknown
- 1992-08-14 DE DE4226976A patent/DE4226976A1/en not_active Ceased
- 1992-08-19 CA CA002076437A patent/CA2076437A1/en not_active Abandoned
- 1992-08-20 JP JP4221305A patent/JPH06212875A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| GB2258876B (en) | 1995-04-12 |
| GB9117993D0 (en) | 1991-10-09 |
| JPH06212875A (en) | 1994-08-02 |
| AU2078192A (en) | 1993-02-25 |
| GB9216537D0 (en) | 1992-09-16 |
| AU661005B2 (en) | 1995-07-13 |
| ZA925913B (en) | 1993-04-28 |
| DE4226976A1 (en) | 1993-02-25 |
| GB2258876A (en) | 1993-02-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |