|Publication number||US3807804 A|
|Publication date||Apr 30, 1974|
|Filing date||Sep 12, 1972|
|Priority date||Sep 12, 1972|
|Also published as||CA963652A, CA963652A1, DE2345965A1|
|Publication number||US 3807804 A, US 3807804A, US-A-3807804, US3807804 A, US3807804A|
|Original Assignee||Kennametal Inc|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (3), Referenced by (172), Classifications (7), Legal Events (1)|
|External Links: USPTO, USPTO Assignment, Espacenet|
United States Patent [191 Kniff 1 Apr. 30, 1974  [MPACTING TOOL WITH TUNGSTEN 3,356,418 12/1967 Healey et a1 299/94 X CARBIDE INSERT TIP 6/1939 Killgore 299/94  Inventor: Thomas J. Kniff, Bedford, Pa.
 Assignee: Kennametal lnc., Latrobe, Pa.
 Filed: Sept. 12, 1972  Appl. No.: 288,292
 US. Cl 299/91, 175/410, 299/94  Int. Cl. E2lc 13/01  Field of Search 299/91, 94; 175/410, 413; 279/96, 103; 29/525  References Cited UNITED STATES PATENTS 3,268,260 8/1966 Snipe 299/91 Primary ExaminerErnest R. Purser Attorney, Agent, or Firm-Melvin A. Crosby ABSTRACT An impacting tool in which a massive hard carbide e1- ement is fitted to a steel holder which is reciprocated to drive the element against a formation to be broken. The massive carbide element can be press fitted in the steel holder or shrink fitted therein or brazed thereto and, furthermore, the carbide element can be fitted to a steel sleeve adapted for being secured to a steel holder as by threading or brazing.
11 Claims, 5 Drawing Figures IMPACTING TOOL WITH TUNGSTEN CARBIDE INSERT TIP The present invention relates to an impact tool, especially to a heavy duty impact tool adapted for being driven by a motor against a formation or rock to be broken.
Impacting tools are known in which an arrangement is provided for driving an impact tool against a rock or formation to be broken or reduced. Reciprocating motors can be employed for reciprocating the impact tool and the motor can either be fluid operated or pneumatically operated. Such impact tools are also adapted for being dropped under the influence of a weight against a region to be impacted thereby.
In the past, hard steel has been employed as the impact tool, or at least the working end of the impact tool, has been formed of hard steel or has been hard faced.
While hard steel and hard facing produces a more wear resistant working end on the impact tool, such treatment of steel leaves a great deal to be desired in the way of wear resistance and hardness.
Such impact tools havebeen provided with small inserts of hard cemented metal carbide material and this greatly improves the wear resistance of the, working end of the tool but, nevertheless, the steel in which the carbide elements are mounted tends to wear away leaving the elements exposed and will sometimes mushroom and create difficulties.
With the foregoing in mind, the present invention proposes the provision of an impact tool of the nature referred to which avoids the drawbacks referred to above in connection with prior art impact tools.
A particular object of the present invention is the provision of an impact tool in which only a single massive wear resistant element is provided as opposed to the provision of multiple wear resistant elements.
Still another object is the provision of an impact point arrangement for an impact tool which can be fitted to a worn impact tool, or detachably mounted on an impact tool formed in such a manner as to receive the point.
The foregoing objects as well as still other objects and advantages of the present invention will become more apparent upon reference to the following detailed specification taken in connection with the accompanying drawings in which:
FIG. 1 is a fragmentary view partly in section showing the working end of an impact tool according to the present invention.
FIG. 2 is a view like FIG. 1 but shows a modification.
FIG. 3 is a view like FIG. 1 but shows still another modification.
FIG. 4 is a fragmentary sectional view showing how a pocket could be formed in the steel holder of the tool for receiving shavings when the hard wear resistant tip is pressed into the holder.
FIG. 5 is a view similar to FIG. 4 but shows another manner of forming the pocket for receiving shavings.
BRIEF SUMMARY OF THE INVENTION According to the present invention, a steel member of substantial size is provided which is adapted for being impelled forcibly in the axial direction against a formation or a rock which is to be reduced or broken tungsten carbide, is mounted in the working end of the steel member and provides a hard wear resistant tip by means of which the tool impacts on the formation or rock. The steel member thus forms a holder and is referred to herein in this manner.
The carbide can be pressed into the steel holder or shrink fitted therein or brazed in position or otherwise secured to the steel holder so as to be fixed thereto. The end of the piece of carbide disposed in the steel holder takes a bearing directly on the holder and is, thus, efiicient for transferring the energy from the holder into the work engaged by the outer end of the carbide piece.
The carbide piece can be mounted directly in the holder, or it can be mounted in steel retaining ring which is welded to the end of a steel holder or threadedly engaged therewith.
DETAILED DESCRIPTION OF THE INVENTION Referring to the drawings somewhat more in detail, in FIG. 1, 10 indicates a steel body adapted to reciprocate in the direction of arrow 12 so as to drive the working end thereof against a formation or rock. The body 10 forms a holder for a hard wear resistant tip and the lower end of the holder is formed with an axial bore 14 and mounted therein is a massive tip element 16 formed of hard wear resistant material, in particular, cemented metal carbide, especially cemented tungsten carbide.
The tip element 16 has a cylindrical portion closely fitting in bore 14 and outwardly beyond the lower end of holder 10 tapers inwardly along a first region 18 at one angle and then tapers inwardly more sharply along a second region 20 to a point.
The holder 10 commencing at about the lower end of the cylindrical region of tip element 16 tapers out-- element 16 thereby providing for a shrink fit of the tip 1 element in the holder or the tip element can be brazed into the holder by placing it in bore 14 with braze material in surrounding relation thereto and heating the holder and tip element to brazing temperature.
It will be appreciated that the upper end of tip element 16 at 26 takes a firm solid bearing on the surface at the bottom of bore 14 for an efficient transfer of energy from holder 10 into tip element 16.
As will be seen in FIG. 2, a tip element 16 can be fixed in a steel support ring 28 and the steel support ring 28 welded, as by welding 30 to the lower end of a steel holder 32 which has been cut off to receive the ring 28. Preferably, both ring 28 and holder 32 are cut off to provide an annular V-shaped recess in which the welding material 30 is received.
Tip element 16 in FIG. 2 extends completely through ring 28 and it will be noted that the upper end 26 thereof takes a full and solid bearing on the lower end of holder 32.
In FIG. 3, tip element 16 is fitted in a steel ring 34 which is provided with threads 36 at the upper end adapted threadedly to engage threads 38 formed on holder 40. When ring 34 is torqued up tight on holder 40, the upper end 26 of tip element 16 will take a firm bearing on the downwardly facing lower end of holder 40.
It has been mentioned that tip element 16 can be press fitted into the holder and FIG. 4 shows how a holder 42 could be provided with a pocket 44 adjacent the bottom of the bore in which tip element 16 is pressed so that any shavings taken from the holder by the tip element during the pressing of the tip element into the bore in the holder will be received in the pocket 44 and will not be disposed between the inner end 26 of tip element 16 and the bottom wall of the bore in the holder.
FIG. 5 shows a manner in which a tip element 16a could be provided with a region thereof at the inner end at 46 somewhat reduced in diameter thereby to provide a pocket 48 for receiving any shavings taken by the tip element as it is pressed into the holder. Both of FIGS. 4 and 5 show arrangements wherein the inner end of the tip element takes a full solid bearing on the bottom of the bore in the holder when the tip element is pressed into the holder. The pockets of FIGS. 4 and 5 are not required for the FIGS. 2 and 3 modifications because the rings shown therein in which the tip elements are mounted can be freed of shavings before assembly with the holder.
All of the modifications illustrated and described are characterized in the use of a single massive piece of cemented carbide, preferably tungsten carbide, to form the working end of the impact tool.
By way of example, such a carbide tip element might be 1% inches in diameter by about 5 inches long and could weigh as much as about 6 pounds.
Greatly increased utility of the impact tool results from the use of the hard metal carbide insert element greater penetrating power and substantially longer life.
What is claimed is:
1. In an impacting tool; steel holder means, a blind cylindrical bore extending into said holder means from the working end thereof, and an impact member in the form of a single cylindrical piece of cemented hard metal carbide material fixed in said bore and having a pointed end protruding from the working end of said holder means, the axially inner end of said impact member bearing directly on the bottom of said bore in load transmitting relation thereto.
2. An impacting tool according to claim 1 in which said material comprises cemented tungsten carbide.
3. An impacting tool according to claim 1 in which said impact member is brazed in said bore.
4. An impacting tool according to claim 1 in which said impact member is cemented in said bore.
5. An impacting tool according to claim 1 in which the pointed outer end of said member comprises a first portion at the point having a wide angle and a second portion adjacent thereto having a narrow angle.
6. An impacting tool according to claim 1 in which said impact member is press fitted into said bore.
7. An impacting tool according to claim 6 in which said bore has an undercut at the bottom to receive any shavings taken by said impact member when it is pressed into said bore.
8. An impacting tool according to claim 6 in which said impact member has a tenon formed on the end in said bore to provide a space to receive any shavings taken by said member when it is pressed into said bore.
9. An impacting tool according to claim 1 in which said holder means comprises a first axial portion at the working end through which said bore extends, and a second axial portion connected to said first portion and having a region forming the bottom of said bore.
10. An impacting tool according to claim 9 in which said portions are connected by welding.
11. An impacting tool according to claim 9 in which said portions are threaded together.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US2161062 *||Mar 24, 1934||Jun 6, 1939||Killgore Robert J||Percussion tool|
|US3268260 *||Mar 7, 1963||Aug 23, 1966||Minsup Mining Supplies||Mounting boxes and picks for coal-cutting machines|
|US3356418 *||Dec 30, 1965||Dec 5, 1967||Tungsten Carbide Developments||Coal-cutter pick with hard metal tip and method of making|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US4005906 *||Dec 15, 1975||Feb 1, 1977||Kennametal Inc.||Impact or demolition tool|
|US4047583 *||Jun 1, 1976||Sep 13, 1977||Dresser Industries, Inc.||Earth boring cutting element retention system|
|US4077734 *||Jun 29, 1976||Mar 7, 1978||Kennametal Inc.||Insert for mining tools and the like|
|US4181187 *||Feb 24, 1978||Jan 1, 1980||Sandvik Aktiebolag||Rock drill bit with stress relief insert sockets|
|US4289211 *||Oct 11, 1979||Sep 15, 1981||Sandvik Aktiebolag||Rock drill bit|
|US4655508 *||Sep 5, 1984||Apr 7, 1987||Tomlinson Peter N||Tool component|
|US4678237 *||Aug 5, 1983||Jul 7, 1987||Huddy Diamond Crown Setting Company (Proprietary) Limited||Cutter inserts for picks|
|US4725099 *||Jul 18, 1985||Feb 16, 1988||Gte Products Corporation||Rotatable cutting bit|
|US4804231 *||Jun 24, 1985||Feb 14, 1989||Gte Laboratories Incorporated||Point attack mine and road milling tool with replaceable cutter tip|
|US4865392 *||Jul 16, 1987||Sep 12, 1989||Gte Products Corporation||Rotatable cutting bit|
|US5131481 *||Dec 19, 1990||Jul 21, 1992||Kennametal Inc.||Insert having a surface of carbide particles|
|US5582494 *||Nov 3, 1994||Dec 10, 1996||Cook; Harold D.||Tool holder system and method of use|
|US5975816 *||Jul 9, 1997||Nov 2, 1999||Cook; Harold D.||Harmonic dampener for rotary tool holder|
|US5979912 *||Jul 9, 1997||Nov 9, 1999||Cook; Harold D.||Heavy-metal shrink fit cutting tool mount|
|US6035512 *||Mar 26, 1999||Mar 14, 2000||Cook; Harold D.||Machine tool extension and method of forming the same|
|US6071219 *||Aug 3, 1998||Jun 6, 2000||Cook; Harold D.||Method and apparatus for mitigating vibration associated with rotary cutting machines|
|US6109842 *||Aug 3, 1999||Aug 29, 2000||Cook; Harold D.||Tool holder with harmonic dampening drive mechanism|
|US6161309 *||Apr 28, 1999||Dec 19, 2000||Cook; Harold D.||Heat shrink tool holder cooler|
|US6234729||Apr 28, 1999||May 22, 2001||Harold D. Cook||Shrink fit shoulder interface|
|US6354771||Dec 2, 1999||Mar 12, 2002||Boart Longyear Gmbh & Co. Kg||Cutting or breaking tool as well as cutting insert for the latter|
|US6382888||Aug 22, 2001||May 7, 2002||Harold D Cook||Vibration dampened spindle and tool holder assembly|
|US6425716||Apr 13, 2000||Jul 30, 2002||Harold D. Cook||Heavy metal burr tool|
|US6932172 *||Nov 30, 2000||Aug 23, 2005||Harold A. Dvorachek||Rotary contact structures and cutting elements|
|US7204560||Aug 15, 2003||Apr 17, 2007||Sandvik Intellectual Property Ab||Rotary cutting bit with material-deflecting ledge|
|US7320505||Aug 11, 2006||Jan 22, 2008||Hall David R||Attack tool|
|US7338135||Aug 11, 2006||Mar 4, 2008||Hall David R||Holder for a degradation assembly|
|US7347292||Jan 29, 2007||Mar 25, 2008||Hall David R||Braze material for an attack tool|
|US7353893||Jan 29, 2007||Apr 8, 2008||Hall David R||Tool with a large volume of a superhard material|
|US7384105||Aug 11, 2006||Jun 10, 2008||Hall David R||Attack tool|
|US7387345||May 11, 2007||Jun 17, 2008||Hall David R||Lubricating drum|
|US7390066||May 11, 2007||Jun 24, 2008||Hall David R||Method for providing a degradation drum|
|US7396086||Apr 3, 2007||Jul 8, 2008||Hall David R||Press-fit pick|
|US7401863||Apr 3, 2007||Jul 22, 2008||Hall David R||Press-fit pick|
|US7410221||Nov 10, 2006||Aug 12, 2008||Hall David R||Retainer sleeve in a degradation assembly|
|US7413256||Aug 11, 2006||Aug 19, 2008||Hall David R||Washer for a degradation assembly|
|US7419224||Aug 11, 2006||Sep 2, 2008||Hall David R||Sleeve in a degradation assembly|
|US7445294||Aug 11, 2006||Nov 4, 2008||Hall David R||Attack tool|
|US7464993||Aug 11, 2006||Dec 16, 2008||Hall David R||Attack tool|
|US7469971||Apr 30, 2007||Dec 30, 2008||Hall David R||Lubricated pick|
|US7469972||Jun 16, 2006||Dec 30, 2008||Hall David R||Wear resistant tool|
|US7475948||Apr 30, 2007||Jan 13, 2009||Hall David R||Pick with a bearing|
|US7503628 *||Sep 1, 2006||Mar 17, 2009||Hall David R||Formation breaking assembly|
|US7568770 *||Mar 15, 2007||Aug 4, 2009||Hall David R||Superhard composite material bonded to a steel body|
|US7588102||Mar 27, 2007||Sep 15, 2009||Hall David R||High impact resistant tool|
|US7594703||May 14, 2007||Sep 29, 2009||Hall David R||Pick with a reentrant|
|US7600823||Aug 24, 2007||Oct 13, 2009||Hall David R||Pick assembly|
|US7628233||Jul 23, 2008||Dec 8, 2009||Hall David R||Carbide bolster|
|US7635168||Jul 22, 2008||Dec 22, 2009||Hall David R||Degradation assembly shield|
|US7637574||Aug 24, 2007||Dec 29, 2009||Hall David R||Pick assembly|
|US7648210||Jan 10, 2008||Jan 19, 2010||Hall David R||Pick with an interlocked bolster|
|US7661765||Aug 28, 2008||Feb 16, 2010||Hall David R||Braze thickness control|
|US7665552||Oct 26, 2006||Feb 23, 2010||Hall David R||Superhard insert with an interface|
|US7669674||Mar 19, 2008||Mar 2, 2010||Hall David R||Degradation assembly|
|US7669938||Jul 6, 2007||Mar 2, 2010||Hall David R||Carbide stem press fit into a steel body of a pick|
|US7712693||Apr 7, 2008||May 11, 2010||Hall David R||Degradation insert with overhang|
|US7717365||Apr 7, 2008||May 18, 2010||Hall David R||Degradation insert with overhang|
|US7722127||Jul 27, 2007||May 25, 2010||Schlumberger Technology Corporation||Pick shank in axial tension|
|US7740414||Nov 2, 2007||Jun 22, 2010||Hall David R||Milling apparatus for a paved surface|
|US7744164||Jul 22, 2008||Jun 29, 2010||Schluimberger Technology Corporation||Shield of a degradation assembly|
|US7832808||Oct 30, 2007||Nov 16, 2010||Hall David R||Tool holder sleeve|
|US7832809||Jul 22, 2008||Nov 16, 2010||Schlumberger Technology Corporation||Degradation assembly shield|
|US7871133||Apr 30, 2008||Jan 18, 2011||Schlumberger Technology Corporation||Locking fixture|
|US7886560||Feb 19, 2008||Feb 15, 2011||Cook Harold D||Heat shrink tool holder cooling cart|
|US7926883||May 15, 2007||Apr 19, 2011||Schlumberger Technology Corporation||Spring loaded pick|
|US7946656||Jun 9, 2008||May 24, 2011||Schlumberger Technology Corporation||Retention system|
|US7946657||Jul 8, 2008||May 24, 2011||Schlumberger Technology Corporation||Retention for an insert|
|US7950746||Jun 16, 2006||May 31, 2011||Schlumberger Technology Corporation||Attack tool for degrading materials|
|US7963617||Mar 19, 2008||Jun 21, 2011||Schlumberger Technology Corporation||Degradation assembly|
|US7992944||Apr 23, 2009||Aug 9, 2011||Schlumberger Technology Corporation||Manually rotatable tool|
|US7992945||Oct 12, 2007||Aug 9, 2011||Schlumberger Technology Corporation||Hollow pick shank|
|US7997661||Jul 3, 2007||Aug 16, 2011||Schlumberger Technology Corporation||Tapered bore in a pick|
|US8007050||Mar 19, 2008||Aug 30, 2011||Schlumberger Technology Corporation||Degradation assembly|
|US8007051||Nov 29, 2007||Aug 30, 2011||Schlumberger Technology Corporation||Shank assembly|
|US8028774||Nov 25, 2009||Oct 4, 2011||Schlumberger Technology Corporation||Thick pointed superhard material|
|US8029068||Apr 30, 2008||Oct 4, 2011||Schlumberger Technology Corporation||Locking fixture for a degradation assembly|
|US8033615||Jun 9, 2008||Oct 11, 2011||Schlumberger Technology Corporation||Retention system|
|US8033616||Aug 28, 2008||Oct 11, 2011||Schlumberger Technology Corporation||Braze thickness control|
|US8038223||Sep 7, 2007||Oct 18, 2011||Schlumberger Technology Corporation||Pick with carbide cap|
|US8061457||Feb 17, 2009||Nov 22, 2011||Schlumberger Technology Corporation||Chamfered pointed enhanced diamond insert|
|US8061784||Jun 9, 2008||Nov 22, 2011||Schlumberger Technology Corporation||Retention system|
|US8079648||Jan 26, 2009||Dec 20, 2011||Kennametal Inc.||Cold-formed cutting tool|
|US8109349||Feb 12, 2007||Feb 7, 2012||Schlumberger Technology Corporation||Thick pointed superhard material|
|US8118371||Jun 25, 2009||Feb 21, 2012||Schlumberger Technology Corporation||Resilient pick shank|
|US8136887||Oct 12, 2007||Mar 20, 2012||Schlumberger Technology Corporation||Non-rotating pick with a pressed in carbide segment|
|US8201892||Dec 10, 2007||Jun 19, 2012||Hall David R||Holder assembly|
|US8215420||Feb 6, 2009||Jul 10, 2012||Schlumberger Technology Corporation||Thermally stable pointed diamond with increased impact resistance|
|US8250786||Aug 5, 2010||Aug 28, 2012||Hall David R||Measuring mechanism in a bore hole of a pointed cutting element|
|US8292372||Dec 21, 2007||Oct 23, 2012||Hall David R||Retention for holder shank|
|US8322796||Apr 16, 2009||Dec 4, 2012||Schlumberger Technology Corporation||Seal with contact element for pick shield|
|US8342611||Dec 8, 2010||Jan 1, 2013||Schlumberger Technology Corporation||Spring loaded pick|
|US8365845||Oct 5, 2011||Feb 5, 2013||Hall David R||High impact resistant tool|
|US8414085||Jan 28, 2008||Apr 9, 2013||Schlumberger Technology Corporation||Shank assembly with a tensioned element|
|US8434573||Aug 6, 2009||May 7, 2013||Schlumberger Technology Corporation||Degradation assembly|
|US8439369 *||Apr 25, 2011||May 14, 2013||Franz Haimer Maschinenbau Kg||Tool holder for a rotary tool|
|US8449040||Oct 30, 2007||May 28, 2013||David R. Hall||Shank for an attack tool|
|US8453497||Nov 9, 2009||Jun 4, 2013||Schlumberger Technology Corporation||Test fixture that positions a cutting element at a positive rake angle|
|US8454096||Jun 26, 2008||Jun 4, 2013||Schlumberger Technology Corporation||High-impact resistant tool|
|US8459751||Dec 9, 2011||Jun 11, 2013||Giovanni Andrina||Percussion tool for a demolishing hammer or the like|
|US8485609||Jan 28, 2008||Jul 16, 2013||Schlumberger Technology Corporation||Impact tool|
|US8500209||Apr 23, 2009||Aug 6, 2013||Schlumberger Technology Corporation||Manually rotatable tool|
|US8500210||Jun 25, 2009||Aug 6, 2013||Schlumberger Technology Corporation||Resilient pick shank|
|US8534767||Jul 13, 2011||Sep 17, 2013||David R. Hall||Manually rotatable tool|
|US8540037||Apr 30, 2008||Sep 24, 2013||Schlumberger Technology Corporation||Layered polycrystalline diamond|
|US8567532||Nov 16, 2009||Oct 29, 2013||Schlumberger Technology Corporation||Cutting element attached to downhole fixed bladed bit at a positive rake angle|
|US8590644||Sep 26, 2007||Nov 26, 2013||Schlumberger Technology Corporation||Downhole drill bit|
|US8622155||Jul 27, 2007||Jan 7, 2014||Schlumberger Technology Corporation||Pointed diamond working ends on a shear bit|
|US8646848||Jun 28, 2011||Feb 11, 2014||David R. Hall||Resilient connection between a pick shank and block|
|US8657385 *||Apr 30, 2009||Feb 25, 2014||Sandvik Intellectual Property Ab||Carbide block and sleeve wear surface|
|US8668275||Jul 6, 2011||Mar 11, 2014||David R. Hall||Pick assembly with a contiguous spinal region|
|US8701799||Apr 29, 2009||Apr 22, 2014||Schlumberger Technology Corporation||Drill bit cutter pocket restitution|
|US8714285||Nov 16, 2009||May 6, 2014||Schlumberger Technology Corporation||Method for drilling with a fixed bladed bit|
|US8728382||Mar 29, 2011||May 20, 2014||David R. Hall||Forming a polycrystalline ceramic in multiple sintering phases|
|US8777326||Jan 23, 2012||Jul 15, 2014||David R. Hall||Pick with hardened core assembly|
|US8931854||Sep 6, 2013||Jan 13, 2015||Schlumberger Technology Corporation||Layered polycrystalline diamond|
|US8960337||Jun 30, 2010||Feb 24, 2015||Schlumberger Technology Corporation||High impact resistant tool with an apex width between a first and second transitions|
|US9028009 *||Jan 18, 2011||May 12, 2015||Element Six Gmbh||Pick tool and method for making same|
|US9033425||May 28, 2013||May 19, 2015||Element Six Gmbh||Pick tool and method for making same|
|US9051794||Apr 12, 2007||Jun 9, 2015||Schlumberger Technology Corporation||High impact shearing element|
|US9051795||Nov 25, 2013||Jun 9, 2015||Schlumberger Technology Corporation||Downhole drill bit|
|US9068410||Jun 26, 2009||Jun 30, 2015||Schlumberger Technology Corporation||Dense diamond body|
|US20050035649 *||Aug 15, 2003||Feb 17, 2005||Sandvik Ab||Rotary cutting bit with material-deflecting ledge|
|US20070290546 *||Jun 16, 2006||Dec 20, 2007||Hall David R||A Wear Resistant Tool|
|US20070290547 *||Mar 15, 2007||Dec 20, 2007||Hall David R||Superhard Composite Material Bonded to a Steel Body|
|US20080035380 *||Jul 27, 2007||Feb 14, 2008||Hall David R||Pointed Diamond Working Ends on a Shear Bit|
|US20080035383 *||Oct 12, 2007||Feb 14, 2008||Hall David R||Non-rotating Pick with a Pressed in Carbide Segment|
|US20080035386 *||Aug 24, 2007||Feb 14, 2008||Hall David R||Pick Assembly|
|US20080035387 *||Sep 26, 2007||Feb 14, 2008||Hall David R||Downhole Drill Bit|
|US20080036269 *||Oct 12, 2007||Feb 14, 2008||Hall David R||Hollow Pick Shank|
|US20080036271 *||May 11, 2007||Feb 14, 2008||Hall David R||Method for Providing a Degradation Drum|
|US20080036274 *||Aug 11, 2006||Feb 14, 2008||Hall David R||Sleeve in a Degradation Assembly|
|US20080036275 *||Nov 10, 2006||Feb 14, 2008||Hall David R||Retainer Sleeve in a Degradation Assembly|
|US20080036276 *||Apr 30, 2007||Feb 14, 2008||Hall David R||Lubricated Pick|
|US20080036279 *||Aug 11, 2006||Feb 14, 2008||Hall David R||Holder for a degradation assembly|
|US20080036280 *||Aug 24, 2007||Feb 14, 2008||Hall David R||Pick Assembly|
|US20080036283 *||Aug 11, 2006||Feb 14, 2008||Hall David R||Attack Tool|
|US20080054707 *||Sep 1, 2006||Mar 6, 2008||Hall David R||Formation Breaking Assembly|
|US20080088172 *||Dec 10, 2007||Apr 17, 2008||Hall David R||Holder Assembly|
|US20080099250 *||Oct 26, 2006||May 1, 2008||Hall David R||Superhard Insert with an Interface|
|US20080115977 *||Jan 28, 2008||May 22, 2008||Hall David R||Impact Tool|
|US20080185468 *||Apr 7, 2008||Aug 7, 2008||Hall David R||Degradation insert with overhang|
|US20080197691 *||Apr 30, 2008||Aug 21, 2008||Hall David R||Locking fixture for a degradation assembly|
|US20080246329 *||Jun 9, 2008||Oct 9, 2008||Hall David R||Retention System|
|US20080250724 *||Apr 12, 2007||Oct 16, 2008||Hall David R||High Impact Shearing Element|
|US20080258536 *||Jun 26, 2008||Oct 23, 2008||Hall David R||High-impact Resistant Tool|
|US20080264697 *||Jul 8, 2008||Oct 30, 2008||Hall David R||Retention for an Insert|
|US20080284234 *||May 14, 2007||Nov 20, 2008||Hall David R||Pick with a Reentrant|
|US20080284235 *||May 15, 2007||Nov 20, 2008||Hall David R||Spring Loaded Pick|
|US20080309146 *||Jul 22, 2008||Dec 18, 2008||Hall David R||Degradation assembly shield|
|US20080309147 *||Jul 22, 2008||Dec 18, 2008||Hall David R||Shield of a Degradation Assembly|
|US20080309148 *||Jul 22, 2008||Dec 18, 2008||Hall David R||Degradation Assembly Shield|
|US20080309149 *||Aug 28, 2008||Dec 18, 2008||Hall David R||Braze Thickness Control|
|US20090051211 *||Feb 12, 2007||Feb 26, 2009||Hall David R||Thick Pointed Superhard Material|
|US20090066149 *||Sep 7, 2007||Mar 12, 2009||Hall David R||Pick with Carbide Cap|
|US20090146489 *||Jun 9, 2008||Jun 11, 2009||Hall David R||Retention System|
|US20090160238 *||Dec 21, 2007||Jun 25, 2009||Hall David R||Retention for Holder Shank|
|US20090267403 *||Jun 25, 2009||Oct 29, 2009||Hall David R||Resilient Pick Shank|
|US20090294182 *||Aug 6, 2009||Dec 3, 2009||Hall David R||Degradation Assembly|
|US20100054875 *||Nov 9, 2009||Mar 4, 2010||Hall David R||Test Fixture that Positions a Cutting Element at a Positive Rake Angle|
|US20100065338 *||Nov 25, 2009||Mar 18, 2010||Hall David R||Thick Pointed Superhard Material|
|US20100263939 *||Oct 21, 2010||Hall David R||High Impact Resistant Tool with an Apex Width between a First and Second Transitions|
|US20100264721 *||Apr 16, 2009||Oct 21, 2010||Hall David R||Seal with Rigid Element for Degradation Assembly|
|US20100275425 *||Apr 29, 2009||Nov 4, 2010||Hall David R||Drill Bit Cutter Pocket Restitution|
|US20100326740 *||Jun 26, 2009||Dec 30, 2010||Hall David R||Bonded Assembly Having Low Residual Stress|
|US20110175430 *||Jul 21, 2011||Ernst Heiderich||Pick tool and method for making same|
|US20110198818 *||Aug 18, 2011||Franz Haimer Maschinenbau Kg||Tool holder for a rotary tool|
|US20110241407 *||Apr 30, 2009||Oct 6, 2011||Sandvik Intellectual Property Ab||Carbide block and sleeve wear surface|
|US20150035344 *||Jul 31, 2013||Feb 5, 2015||David R. Hall||Pick Tool with a Removable Shank|
|USRE38151||Aug 20, 2001||Jun 24, 2003||Kennametal Inc.||Rotatable cutting bit|
|DE2807353A1 *||Feb 21, 1978||Sep 7, 1978||Sandvik Ab||Gesteins-bohrspitze|
|EP2305433A1||Oct 4, 2010||Apr 6, 2011||Mario Giancarlo Di||Impact demolition tool|
|EP2465644A1 *||Dec 12, 2011||Jun 20, 2012||Giovanni Andrina||Percussion tool for a demolishing hammer or the like|
|WO2010085730A1 *||Jan 25, 2010||Jul 29, 2010||Kennametal Inc.||Cold-formed cutting tool|
|International Classification||E21C37/00, E21C37/24, B25D17/00, B25D17/02|
|Dec 28, 1987||AS||Assignment|
Owner name: EAGLE SIGNAL CONTROLS CORP., A CORP. OF DE.
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:WICKES MANUFACTURING COMPANY, A DE. CORP.;REEL/FRAME:004821/0443
Effective date: 19871218
Owner name: WICKES MANUFACTURING COMPANY, 26261 EVERGREEN ROAD
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:GULF & WESTERN INDUSTRIES, INC., FORMERLY GULF & WESTERNINDUSTRIES, INC.,;REEL/FRAME:004821/0437
Effective date: 19871215
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:GULF & WESTERN INDUSTRIES, INC., FORMERLY GULF & WESTERN INDUSTRIES, INC.,;REEL/FRAME:004821/0437
Owner name: WICKES MANUFACTURING COMPANY, A CORP. OF DE.,MICHI