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Publication numberUS3807804 A
Publication typeGrant
Publication dateApr 30, 1974
Filing dateSep 12, 1972
Priority dateSep 12, 1972
Also published asCA963652A1, DE2345965A1
Publication numberUS 3807804 A, US 3807804A, US-A-3807804, US3807804 A, US3807804A
InventorsKniff T
Original AssigneeKennametal Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Impacting tool with tungsten carbide insert tip
US 3807804 A
Abstract
An impacting tool in which a massive hard carbide element 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.
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Description  (OCR text may contain errors)

United States Patent [191 Kniff 1 Apr. 30, 1974 [54] [MPACTING TOOL WITH TUNGSTEN 3,356,418 12/1967 Healey et a1 299/94 X CARBIDE INSERT TIP 6/1939 Killgore 299/94 [75] Inventor: Thomas J. Kniff, Bedford, Pa.

[73] Assignee: Kennametal lnc., Latrobe, Pa.

[22] Filed: Sept. 12, 1972 [21] Appl. No.: 288,292

[52] US. Cl 299/91, 175/410, 299/94 [51] Int. Cl. E2lc 13/01 [58] Field of Search 299/91, 94; 175/410, 413; 279/96, 103; 29/525 [56] 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.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2161062 *Mar 24, 1934Jun 6, 1939Killgore Robert JPercussion tool
US3268260 *Mar 7, 1963Aug 23, 1966Minsup Mining SuppliesMounting boxes and picks for coal-cutting machines
US3356418 *Dec 30, 1965Dec 5, 1967Tungsten Carbide DevelopmentsCoal-cutter pick with hard metal tip and method of making
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4005906 *Dec 15, 1975Feb 1, 1977Kennametal Inc.Impact or demolition tool
US4047583 *Jun 1, 1976Sep 13, 1977Dresser Industries, Inc.Earth boring cutting element retention system
US4077734 *Jun 29, 1976Mar 7, 1978Kennametal Inc.Insert for mining tools and the like
US4181187 *Feb 24, 1978Jan 1, 1980Sandvik AktiebolagRock drill bit with stress relief insert sockets
US4289211 *Oct 11, 1979Sep 15, 1981Sandvik AktiebolagRock drill bit
US4655508 *Sep 5, 1984Apr 7, 1987Tomlinson Peter NTool component
US4678237 *Aug 5, 1983Jul 7, 1987Huddy Diamond Crown Setting Company (Proprietary) LimitedCutter inserts for picks
US4725099 *Jul 18, 1985Feb 16, 1988Gte Products CorporationRotatable cutting bit
US4804231 *Jun 24, 1985Feb 14, 1989Gte Laboratories IncorporatedPoint attack mine and road milling tool with replaceable cutter tip
US4865392 *Jul 16, 1987Sep 12, 1989Gte Products CorporationRotatable cutting bit
US5131481 *Dec 19, 1990Jul 21, 1992Kennametal Inc.Insert having a surface of carbide particles
US5582494 *Nov 3, 1994Dec 10, 1996Cook; Harold D.Tool holder system and method of use
US5975816 *Jul 9, 1997Nov 2, 1999Cook; Harold D.Harmonic dampener for rotary tool holder
US5979912 *Jul 9, 1997Nov 9, 1999Cook; Harold D.Heavy-metal shrink fit cutting tool mount
US6035512 *Mar 26, 1999Mar 14, 2000Cook; Harold D.Machine tool extension and method of forming the same
US6071219 *Aug 3, 1998Jun 6, 2000Cook; Harold D.Method and apparatus for mitigating vibration associated with rotary cutting machines
US6109842 *Aug 3, 1999Aug 29, 2000Cook; Harold D.Tool holder with harmonic dampening drive mechanism
US6161309 *Apr 28, 1999Dec 19, 2000Cook; Harold D.Heat shrink tool holder cooler
US6234729Apr 28, 1999May 22, 2001Harold D. CookShrink fit shoulder interface
US6354771Dec 2, 1999Mar 12, 2002Boart Longyear Gmbh & Co. KgCutting or breaking tool as well as cutting insert for the latter
US6382888Aug 22, 2001May 7, 2002Harold D CookVibration dampened spindle and tool holder assembly
US6425716Apr 13, 2000Jul 30, 2002Harold D. CookHeavy metal burr tool
US6932172 *Nov 30, 2000Aug 23, 2005Harold A. DvorachekRotary contact structures and cutting elements
US7204560Aug 15, 2003Apr 17, 2007Sandvik Intellectual Property AbRotary cutting bit with material-deflecting ledge
US7320505Aug 11, 2006Jan 22, 2008Hall David RAttack tool
US7338135Aug 11, 2006Mar 4, 2008Hall David RHolder for a degradation assembly
US7347292Jan 29, 2007Mar 25, 2008Hall David RBraze material for an attack tool
US7353893Jan 29, 2007Apr 8, 2008Hall David RTool with a large volume of a superhard material
US7384105Aug 11, 2006Jun 10, 2008Hall David RAttack tool
US7387345May 11, 2007Jun 17, 2008Hall David RLubricating drum
US7390066May 11, 2007Jun 24, 2008Hall David RMethod for providing a degradation drum
US7396086Apr 3, 2007Jul 8, 2008Hall David RPress-fit pick
US7401863Apr 3, 2007Jul 22, 2008Hall David RPress-fit pick
US7410221Nov 10, 2006Aug 12, 2008Hall David RRetainer sleeve in a degradation assembly
US7413256Aug 11, 2006Aug 19, 2008Hall David RWasher for a degradation assembly
US7419224Aug 11, 2006Sep 2, 2008Hall David RSleeve in a degradation assembly
US7445294Aug 11, 2006Nov 4, 2008Hall David RAttack tool
US7464993Aug 11, 2006Dec 16, 2008Hall David RAttack tool
US7469971Apr 30, 2007Dec 30, 2008Hall David RLubricated pick
US7469972Jun 16, 2006Dec 30, 2008Hall David RWear resistant tool
US7475948Apr 30, 2007Jan 13, 2009Hall David RPick with a bearing
US7503628 *Sep 1, 2006Mar 17, 2009Hall David RFormation breaking assembly
US7568770 *Mar 15, 2007Aug 4, 2009Hall David RSuperhard composite material bonded to a steel body
US7588102Mar 27, 2007Sep 15, 2009Hall David RHigh impact resistant tool
US7594703May 14, 2007Sep 29, 2009Hall David RPick with a reentrant
US7600823Aug 24, 2007Oct 13, 2009Hall David RPick assembly
US7628233Jul 23, 2008Dec 8, 2009Hall David RCarbide bolster
US7635168Jul 22, 2008Dec 22, 2009Hall David RDegradation assembly shield
US7637574Aug 24, 2007Dec 29, 2009Hall David RPick assembly
US7648210Jan 10, 2008Jan 19, 2010Hall David RPick with an interlocked bolster
US7661765Aug 28, 2008Feb 16, 2010Hall David RBraze thickness control
US7665552Oct 26, 2006Feb 23, 2010Hall David RSuperhard insert with an interface
US7669674Mar 19, 2008Mar 2, 2010Hall David RDegradation assembly
US7669938Jul 6, 2007Mar 2, 2010Hall David RCarbide stem press fit into a steel body of a pick
US7712693Apr 7, 2008May 11, 2010Hall David RDegradation insert with overhang
US7717365Apr 7, 2008May 18, 2010Hall David RDegradation insert with overhang
US7722127Jul 27, 2007May 25, 2010Schlumberger Technology CorporationPick shank in axial tension
US7740414Nov 2, 2007Jun 22, 2010Hall David RMilling apparatus for a paved surface
US7744164Jul 22, 2008Jun 29, 2010Schluimberger Technology CorporationShield of a degradation assembly
US7832808Oct 30, 2007Nov 16, 2010Hall David RTool holder sleeve
US7832809Jul 22, 2008Nov 16, 2010Schlumberger Technology CorporationDegradation assembly shield
US7871133Apr 30, 2008Jan 18, 2011Schlumberger Technology CorporationLocking fixture
US7886560Feb 19, 2008Feb 15, 2011Cook Harold DHeat shrink tool holder cooling cart
US7926883May 15, 2007Apr 19, 2011Schlumberger Technology CorporationSpring loaded pick
US7946656Jun 9, 2008May 24, 2011Schlumberger Technology CorporationRetention system
US7946657Jul 8, 2008May 24, 2011Schlumberger Technology CorporationRetention for an insert
US7950746Jun 16, 2006May 31, 2011Schlumberger Technology CorporationAttack tool for degrading materials
US7963617Mar 19, 2008Jun 21, 2011Schlumberger Technology CorporationDegradation assembly
US7992944Apr 23, 2009Aug 9, 2011Schlumberger Technology CorporationManually rotatable tool
US7992945Oct 12, 2007Aug 9, 2011Schlumberger Technology CorporationHollow pick shank
US7997661Jul 3, 2007Aug 16, 2011Schlumberger Technology CorporationTapered bore in a pick
US8007050Mar 19, 2008Aug 30, 2011Schlumberger Technology CorporationDegradation assembly
US8007051Nov 29, 2007Aug 30, 2011Schlumberger Technology CorporationShank assembly
US8028774Nov 25, 2009Oct 4, 2011Schlumberger Technology CorporationThick pointed superhard material
US8029068Apr 30, 2008Oct 4, 2011Schlumberger Technology CorporationLocking fixture for a degradation assembly
US8033615Jun 9, 2008Oct 11, 2011Schlumberger Technology CorporationRetention system
US8033616Aug 28, 2008Oct 11, 2011Schlumberger Technology CorporationBraze thickness control
US8038223Sep 7, 2007Oct 18, 2011Schlumberger Technology CorporationPick with carbide cap
US8061457Feb 17, 2009Nov 22, 2011Schlumberger Technology CorporationChamfered pointed enhanced diamond insert
US8061784Jun 9, 2008Nov 22, 2011Schlumberger Technology CorporationRetention system
US8079648Jan 26, 2009Dec 20, 2011Kennametal Inc.Cold-formed cutting tool
US8109349Feb 12, 2007Feb 7, 2012Schlumberger Technology CorporationThick pointed superhard material
US8118371Jun 25, 2009Feb 21, 2012Schlumberger Technology CorporationResilient pick shank
US8136887Oct 12, 2007Mar 20, 2012Schlumberger Technology CorporationNon-rotating pick with a pressed in carbide segment
US8201892Dec 10, 2007Jun 19, 2012Hall David RHolder assembly
US8215420Feb 6, 2009Jul 10, 2012Schlumberger Technology CorporationThermally stable pointed diamond with increased impact resistance
US8250786Aug 5, 2010Aug 28, 2012Hall David RMeasuring mechanism in a bore hole of a pointed cutting element
US8292372Dec 21, 2007Oct 23, 2012Hall David RRetention for holder shank
US8322796Apr 16, 2009Dec 4, 2012Schlumberger Technology CorporationSeal with contact element for pick shield
US8342611Dec 8, 2010Jan 1, 2013Schlumberger Technology CorporationSpring loaded pick
US8365845Oct 5, 2011Feb 5, 2013Hall David RHigh impact resistant tool
US8414085Jan 28, 2008Apr 9, 2013Schlumberger Technology CorporationShank assembly with a tensioned element
US8434573Aug 6, 2009May 7, 2013Schlumberger Technology CorporationDegradation assembly
US8439369 *Apr 25, 2011May 14, 2013Franz Haimer Maschinenbau KgTool holder for a rotary tool
US8449040Oct 30, 2007May 28, 2013David R. HallShank for an attack tool
US8453497Nov 9, 2009Jun 4, 2013Schlumberger Technology CorporationTest fixture that positions a cutting element at a positive rake angle
US8454096Jun 26, 2008Jun 4, 2013Schlumberger Technology CorporationHigh-impact resistant tool
US8459751Dec 9, 2011Jun 11, 2013Giovanni AndrinaPercussion tool for a demolishing hammer or the like
US8485609Jan 28, 2008Jul 16, 2013Schlumberger Technology CorporationImpact tool
US8500209Apr 23, 2009Aug 6, 2013Schlumberger Technology CorporationManually rotatable tool
US8500210Jun 25, 2009Aug 6, 2013Schlumberger Technology CorporationResilient pick shank
US8534767Jul 13, 2011Sep 17, 2013David R. HallManually rotatable tool
US8540037Apr 30, 2008Sep 24, 2013Schlumberger Technology CorporationLayered polycrystalline diamond
US8567532Nov 16, 2009Oct 29, 2013Schlumberger Technology CorporationCutting element attached to downhole fixed bladed bit at a positive rake angle
US8590644Sep 26, 2007Nov 26, 2013Schlumberger Technology CorporationDownhole drill bit
US8622155Jul 27, 2007Jan 7, 2014Schlumberger Technology CorporationPointed diamond working ends on a shear bit
US8646848Jun 28, 2011Feb 11, 2014David R. HallResilient connection between a pick shank and block
US8657385 *Apr 30, 2009Feb 25, 2014Sandvik Intellectual Property AbCarbide block and sleeve wear surface
US8668275Jul 6, 2011Mar 11, 2014David R. HallPick assembly with a contiguous spinal region
US8714285Nov 16, 2009May 6, 2014Schlumberger Technology CorporationMethod for drilling with a fixed bladed bit
US8728382Mar 29, 2011May 20, 2014David R. HallForming a polycrystalline ceramic in multiple sintering phases
US8777326Jan 23, 2012Jul 15, 2014David R. HallPick with hardened core assembly
US8931854Sep 6, 2013Jan 13, 2015Schlumberger Technology CorporationLayered polycrystalline diamond
US8960337Jun 30, 2010Feb 24, 2015Schlumberger Technology CorporationHigh impact resistant tool with an apex width between a first and second transitions
US20110175430 *Jan 18, 2011Jul 21, 2011Ernst HeiderichPick tool and method for making same
US20110198818 *Apr 25, 2011Aug 18, 2011Franz Haimer Maschinenbau KgTool holder for a rotary tool
US20110241407 *Apr 30, 2009Oct 6, 2011Sandvik Intellectual Property AbCarbide block and sleeve wear surface
US20150035344 *Jul 31, 2013Feb 5, 2015David R. HallPick Tool with a Removable Shank
USRE38151Aug 20, 2001Jun 24, 2003Kennametal Inc.Rotatable cutting bit
DE2807353A1 *Feb 21, 1978Sep 7, 1978Sandvik AbGesteins-bohrspitze
EP2305433A1Oct 4, 2010Apr 6, 2011Mario Giancarlo DiImpact demolition tool
EP2465644A1 *Dec 12, 2011Jun 20, 2012Giovanni AndrinaPercussion tool for a demolishing hammer or the like
WO2010085730A1 *Jan 25, 2010Jul 29, 2010Kennametal Inc.Cold-formed cutting tool
Classifications
U.S. Classification299/113
International ClassificationE21C37/00, E21C37/24, B25D17/00, B25D17/02
Cooperative ClassificationB25D17/02
European ClassificationB25D17/02
Legal Events
DateCodeEventDescription
Dec 28, 1987ASAssignment
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