US3807804A - Impacting tool with tungsten carbide insert tip - Google Patents

Impacting tool with tungsten carbide insert tip Download PDF

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Publication number
US3807804A
US3807804A US28829272A US3807804A US 3807804 A US3807804 A US 3807804A US 28829272 A US28829272 A US 28829272A US 3807804 A US3807804 A US 3807804A
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United States
Prior art keywords
bore
impacting tool
tool according
impact member
holder
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Expired - Lifetime
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T Kniff
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EAGLE SIGNAL CONTROLS CORP A CORP OF DE
Kennametal Inc
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Kennametal Inc
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Assigned to EAGLE SIGNAL CONTROLS CORP., A CORP. OF DE. reassignment EAGLE SIGNAL CONTROLS CORP., A CORP. OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: WICKES MANUFACTURING COMPANY, A DE. CORP.
Assigned to WICKES MANUFACTURING COMPANY, A CORP. OF DE. reassignment WICKES MANUFACTURING COMPANY, A CORP. OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: GULF & WESTERN INDUSTRIES, INC., FORMERLY GULF & WESTERN INDUSTRIES, INC.,
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D17/00Details of, or accessories for, portable power-driven percussive tools
    • B25D17/02Percussive tool bits

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.

Description

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.

Claims (11)

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.
US28829272 1972-09-12 1972-09-12 Impacting tool with tungsten carbide insert tip Expired - Lifetime US3807804A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US28829272 US3807804A (en) 1972-09-12 1972-09-12 Impacting tool with tungsten carbide insert tip

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US28829272 US3807804A (en) 1972-09-12 1972-09-12 Impacting tool with tungsten carbide insert tip
CA180,255A CA963652A (en) 1972-09-12 1973-09-04 Impacting tool
GB4141873A GB1403137A (en) 1972-09-12 1973-09-04 Impacting tool
JP10099373A JPS5543868B2 (en) 1972-09-12 1973-09-07
DE19732345965 DE2345965A1 (en) 1972-09-12 1973-09-12 impact tool
FR7332852A FR2198812B1 (en) 1972-09-12 1973-09-12

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US3807804A true US3807804A (en) 1974-04-30

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JP (1) JPS5543868B2 (en)
CA (1) CA963652A (en)
DE (1) DE2345965A1 (en)
FR (1) FR2198812B1 (en)
GB (1) GB1403137A (en)

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US6071219A (en) * 1997-07-09 2000-06-06 Cook; Harold D. Method and apparatus for mitigating vibration associated with rotary cutting machines
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US7503628B2 (en) * 2006-09-01 2009-03-17 Hall David R Formation breaking assembly
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US20080099250A1 (en) * 2006-10-26 2008-05-01 Hall David R Superhard Insert with an Interface
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US7347292B1 (en) 2006-10-26 2008-03-25 Hall David R Braze material for an attack tool
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US8646848B2 (en) 2007-12-21 2014-02-11 David R. Hall Resilient connection between a pick shank and block
US20090160238A1 (en) * 2007-12-21 2009-06-25 Hall David R Retention for Holder Shank
US7886560B2 (en) 2008-02-19 2011-02-15 Cook Harold D Heat shrink tool holder cooling cart
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US8931854B2 (en) 2008-04-30 2015-01-13 Schlumberger Technology Corporation Layered polycrystalline diamond
US8540037B2 (en) 2008-04-30 2013-09-24 Schlumberger Technology Corporation Layered polycrystalline diamond
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US7628233B1 (en) 2008-07-23 2009-12-08 Hall David R Carbide bolster
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US8079648B2 (en) 2009-01-26 2011-12-20 Kennametal Inc. Cold-formed cutting tool
US8061457B2 (en) 2009-02-17 2011-11-22 Schlumberger Technology Corporation Chamfered pointed enhanced diamond insert
US20100242375A1 (en) * 2009-03-30 2010-09-30 Hall David R Double Sintered Thermally Stable Polycrystalline Diamond Cutting Elements
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US8701799B2 (en) 2009-04-29 2014-04-22 Schlumberger Technology Corporation Drill bit cutter pocket restitution
US20100275425A1 (en) * 2009-04-29 2010-11-04 Hall David R Drill Bit Cutter Pocket Restitution
US20100326740A1 (en) * 2009-06-26 2010-12-30 Hall David R Bonded Assembly Having Low Residual Stress
ITMI20091205A1 (en) * 2009-07-08 2011-01-09 Delfino Giuseppe Hand tool for stone material and tow for that tool
EP2305433A1 (en) 2009-10-05 2011-04-06 Giancarlo Di Mario Impact demolition tool
US20110175430A1 (en) * 2010-01-20 2011-07-21 Ernst Heiderich Pick tool and method for making same
US9028009B2 (en) * 2010-01-20 2015-05-12 Element Six Gmbh Pick tool and method for making same
US9033425B2 (en) 2010-01-20 2015-05-19 Element Six Gmbh Pick tool and method for making same
US8250786B2 (en) 2010-06-30 2012-08-28 Hall David R Measuring mechanism in a bore hole of a pointed cutting element
EP2465644A1 (en) * 2010-12-20 2012-06-20 Giovanni Andrina Percussion tool for a demolishing hammer or the like
ITTO20101023A1 (en) * 2010-12-20 2012-06-21 Giovanni Andrina percussive tool for a demolition hammer or the like.
US8459751B2 (en) 2010-12-20 2013-06-11 Giovanni Andrina Percussion tool for a demolishing hammer or the like
US8728382B2 (en) 2011-03-29 2014-05-20 David R. Hall Forming a polycrystalline ceramic in multiple sintering phases
US8668275B2 (en) 2011-07-06 2014-03-11 David R. Hall Pick assembly with a contiguous spinal region
US8777326B2 (en) 2012-01-23 2014-07-15 David R. Hall Pick with hardened core assembly
US20150035344A1 (en) * 2013-07-31 2015-02-05 David R. Hall Pick Tool with a Removable Shank
WO2016153364A3 (en) * 2015-03-20 2018-04-26 Bihasa Ismael L Chipping bit

Also Published As

Publication number Publication date
FR2198812B1 (en) 1978-04-28
JPS4994000A (en) 1974-09-06
JPS5543868B2 (en) 1980-11-08
FR2198812A1 (en) 1974-04-05
DE2345965A1 (en) 1974-03-28
CA963652A (en) 1975-03-04
GB1403137A (en) 1975-08-13
CA963652A1 (en)

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