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Publication numberUS3833265 A
Publication typeGrant
Publication dateSep 3, 1974
Filing dateNov 6, 1972
Priority dateOct 20, 1965
Publication numberUS 3833265 A, US 3833265A, US-A-3833265, US3833265 A, US3833265A
InventorsElders G
Original AssigneeElders G
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Rotatable sleeve for self-sharpening bit
US 3833265 A
Abstract
A bit and block assembly in which a sleeve is rotatively mounted in a block bore and in which a point-attack bit has its elongate shank mounted in a sleeve bore and has a cutting tip on the leading end of the bit head that penetrates the material being mined with a picking action upon travel of the bit into and out of a mine face. A plurality of protuberances are provided on and extend outwardly from the periphery of the sleeve head, the protuberances providing frictional contact with the material being mined to effect positive turning of the sleeve, and hence of the bit in the sleeve, upon picking of the mine face by the bit head. In one embodiment, the protuberances consist of fins on and extending substantially lengthwise of the sleeve head and projecting laterally outwardly from the periphery of the sleeve head. In another embodiment, the protuberances consist of individual knobs formed on and projecting laterally outwardly from the periphery of the sleeve head. The protuberances are circumferentially spaced about the periphery of the sleeve head to provide longitudinal passages therebetween extending from its leading end to its trailing end, the material being mined being movable through the passages and engageable with the protuberances to effect positive turning of the sleeve and bit and to effect removal of the material being mined from the sleeve head. The sleeve head with its protuberances extends laterally outwardly beyond the outer block face to enable discharge of the material being mined from the passages between the circumferentially spaced protuberances.
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United States Patent [191 Elders Sept. 3, 1974 ROTATABLE SLEEVE FOR SELF-SHARPENING BIT [76] Inventor: Gerald W. Elders, 10 l-lillcrest St.,

Christopher, Ill. 62822 [22] Filed: Nov. 6, 1972 [21] Appl. No.: 304,242

Related US. Application Data [63] Continuation-impart of Ser. No. 69,161, Sept. 2, 1970, abandoned, Continuation-in-part of Ser. No. 498,638, Oct. 20, 1965, abandoned.

Elders 299/86 Primary ExaminerErnest R. Purser [57] ABSTRACT A bit and block assembly in which a sleeve is rotatively mounted in a block bore and in which a pointattack bit has its elongate shank mounted in a sleeve bore and has a cutting-tip on the leading end of the bit head that penetrates the material being mined with a picking action upon travel of the bit into and out of a mine face. A plurality of protuberances are provided on and extend outwardly from the periphery of the sleeve head, the protuberances providing frictional contact with the material being mined to effect positive turning of the sleeve, and hence of the bit in the sleeve, upon picking of the mine face by the bit head. In one embodiment, the protuberances consist of fins on and extending'substantially lengthwise of the sleeve head and projecting laterally outwardly from the periphery of the sleeve head. In another embodiment, the protuberances consist of individual knobs formed on and projecting laterally outwardly from the periphery of the sleeve head. The protuberances are circumferentially spaced about the periphery of the sleeve head to provide longitudinal passages therebetween extending from its leading end to its trailing end, the material being mined being movable through the passages and engageable with the protuberances to effect positive turning of the sleeve and bit and to effect removal of the material being mined from the sleeve head. The sleeve head with its protuberances extends laterally outwardly beyond the outer block face to enable discharge of the material being mined from the passages between the circumferentially spaced protuberances.

5 Claims, 4 Drawing Figures ROTATABLE SLEEVE FOR SELF-SI-IARPENING BIT CROSS REFERENCE TO RELATED APPLICATIONS This application is a continuation-in-part of copending U.S. Pat. application Ser. No. 69,161, filed Sept. 2, 1970 now abandonedwhich was a copending continuation of U.S. Pat. application Ser. No. 498,638 filed Oct. 20, 1965 now abandoned.

BACKGROUND OF THE INVENTION This invention relates generally to improvements in a bit mounting, and more particularly to a mounting that causes the bit to turn automatically during cutting action to provide a self-sharpening of the bit head that results in longer bit wear and life.

A self-sharpening bit has been realized by providing protuberances on the conical head of the bit so that the protuberances will engage the material being mined during the picking action of the bit, the frictional contact of the protuberances with the material causing the bit to rotate in its mounting in the block bore.

SUMMARY OF THE INVENTION The present bit and block assembly consists of -a sleeve rotatively mounted in a block bore, and a pointattack bit having its elongate shank mounted in the sleeve bore and having a cutting tip on the leading end of the bit head-that penetrates material being mined with a picking action upon travel of the bit into and out of a mine face. A plurality of protuberances are provided on and extend outwardly from the periphery of the sleeve head, the protuberances providing frictional contact with the material being mined to effect positive turning of the sleeve, and hence of the bit in the sleeve, upon picking of the mine face by the bit head.

The provision of protuberances on the sleeve head realizes effective rotation of the bit without sole reliance on any protuberances on the bit head as previously provided.

The protuberances are provided about the periphery of the sleeve head with at least one protuberance in position to frictionally engage the material being mined to effect positive turning. Preferably, the protuberances are circumferentially spaced relatively about the sleeve head periphery.

In one embodiment, the protuberances consist of fins on and extending substantially lengthwise of the sleeve head and projecting laterally outwardly from the periphery of the sleeve head.

In another embodiment, the protuberances consist of individual knobs formed on and projecting laterally outwardly from the periphery of the sleeve head.

The sleeve head with its protuberances, engages the block front face to position the sleeve in the block, and the bit head engages the sleeve head to position the bit in the sleeve. Upon cutting action, the force of the bit head striking the mine face, urges the bit head rearwardly against the sleeve head, and hence urges the sleeve head rearwardly against the block front face. Accordingly, the bit and sleeve are frictionally interconnected so that as the material being mined engages and passes longitudinally between the protuberances on the sleeve head to effect a positive angular rotation of the sleeve, the sleeve will in turn angularly rotate the bit.

The protuberances are circumferentially spaced about the periphery of the sleeve head to provide longitudinal passages therebetween extending from its leading end of the sleeve head to its trailing end, the material being mined being movable through the passages and engageable with the protuberances to effect positive turning of the sleeve and bit and to effect removal of the material being mined from the sleeve head.

The block has an outer face adjacent to the front face. The sleeve head with its protuberances engages the block front face to position the sleeve in the block and extends laterally outwardly beyond the outer block face to enable discharge of the material being mined rearwardly from the passages between the circumferentially spaced protuberances.

DETAILED DESCRIPTION OF THE DRAWING DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now by characters of reference to the drawing, and first to the embodiment of FIGS. 1-3, it will be understood that the block 10 is provided with a substantially cylindrical bore 11 extending through the front block face 12 and the rear block face 13. The bore 11 is flared at the front block face 12 to provide an outwardly divergent shoulder 14. The block 10 includes an outer block face 15.

A point-attack bit generally indicated at 16 includes an elongate shank 17 having a circular cross-section. A tapered head 20 is formed integrally and coaxially with the shank 17, the head 20 tapering toward the forward end of the bit to provide a reduced leading end 21 and a relatively enlarged trailing end 22. The bit shank 16 includes an enlarged, outwardly diverging shank portion 23 integrally connected to the trailing end 22 of the bit head 20.

Inserted in and attached to the leading end 21 of the bit head 20 is a carbide cutting tip 24. The tip 24 is provided with a relatively sharp point. The tapered bit head 20 including the carbide tip 24 picks at the mine wall in order to cut away a portion of such wall. The tapered bit end 20' enters the wall with its leading end foremost and with its longitudinal axis arranged at a slight angle to the surface of the wall, in an intermittent picking action.

Associated with both the block 10 and the bit 16 is a sleeve generally indicated by 25. This sleeve includes an elongate shank 26 rotatively mounted in the block bore 1 l, the rearmost end 27 of the sleeve 25 extending outwardly beyond the rear block face 13. The forwardmost end of the sleeve 25 includes an enlarged head 30 that can be tapered to provide a reduced leading end 31 and an enlarged trailing end 32. The sleeve shank 26 includes an enlarged, outwardly diverging shank portion 33 integrally connected to the head 30, the shank portion 33 engaging the annular bore shoulder 14.

The sleeve 25 includes a longitudinal bore 34 that is adapted to receive the bit shank 16. The sleeve bore 34 is flared at the outermost face of the sleeve head 30 to provide an outwardly divergent shoulder 35. When the bit 16 is assembled to the sleeve 25, the bit shank portion 23 engages the annular sleeve shoulder 35'.

To look the sleeve 25 in the block 10, a pin 36 is inserted into the side of the block and into an annular groove 37 provided inthe sleeve shank 26. The rear block face 13 is immediately adjacent the locking connection provided by pin 36 and groove 37 to permit any foreign material moving axially along the block bore 11 between the block 10 and sleeve shank 26 to fall freely out of the block for discharge, and thereby enable the sleeve shank 26 to rotate at all times in the block bore 11.

When assembled, the bit shank 17 is selectively locked to the sleeve shank 26. A pin 40 is inserted'into the sleeve shank 26 and into a compatible annular groove 41 formed in the end of the bit shank 17. The rear end of the sleeve shank 26 is countersunk to provide a recess immediately rearwardly of the annular groove 41 to permit any foreign material moving axially along the sleeve bore 34 between the bit shank 17 and sleeve shank 26 to fall freely out of the bore 34 for discharge.

To assemble this device, the bit shank 17 is usually first inserted into the sleeve bore 34 until the bit shank portion 23 engages the sleeve shoulder 35. Then, the bit shank 17 is locked to the sleeve 25 by inserting the pin 40 into the sleeve shank 26 and into the annular groove 41 of the bit shank 17. Then, the sleeve shank 26, together with its assembled bit 16, is inserted into the block bore 11 until the sleeve shank portion 33 engages the block shoulder 14. Then, a pin 36 is inserted into the block 10 and into the annular groove 37 of the sleeve shank 26 to lock the sleeve 25 in the block 10.

A plurality of protuberances42 are provided on and extend outwardly from the periphery of the sleeve head 30, the protuberances being circumferentially spaced so that at least one of theprotuberances will frictionally engage the material being mined. Specifically, the protuberances are spaced to provide longitudinal passages therebetween extending from the leading end 31 to the trailing end 32 of the sleeve head 30. The material being mined is movable through the passages and engageable with the probuterances 42 to effect positive turning of the sleeve 25 and'bit 16, and in addition, to effect removal of the material being mined from the sleeve head 30. The sleeve head 30 with its protuberances 42 extend outwardly from the outer block face to enable the free discharge of the material being mined from the passages between the circumferentially spaced protuberances 42.

In the embodiment of FIGS. 1-3, the protuberances consist of fins on and extending substantially lengthwise of the sleeve head 30. These fins are preferably inclined at an angle to the longitudinal axis of the sleeve and bit 16.

In the embodiment of FIG. 4, the protuberances 42- consist of individual knobs formed on and projecting laterally outwardly from the periphery of the sleeve head. These knobs can be randomly spaced, but it is preferred that they be aligned in circumferentially spaced rows arranged at an angle to the longitudinal axis of the sleeve 25 and bit l6.

the mine face with a picking action to remove material from such face. The material being mined will move rearwardly over the sleeve head 30 and into the passages between thecircumferentially spaced protuberances 42, the material frictionally engaging the protuberances 42 and tending to rotate the sleeve 25 in its mounting in theblock bore 11. Because the bit head 20 is forcefully urged against the sleeve head 30 during this picking action, rotation of the sleeve 25 will cause a resultant rotationof the bit 16 carried within the sleeve 25. The bit 16 is moved to a'different angular position for each picking stroke. Consequently, all of the periphery of the tapered bit head 20 is presented to the wall in a picking action at different times in different angular positions, whereby the periphery of the tapered bit head 20. and carbide tip 24 is worn substantially evenly and .is maintained in a cutting, tapered configuration because it is self-sharpened.

It is thought that the usage and operation of the bit and block assembly have become apparent from the foregoing detailed description of parts, but for completeness of disclosure, it will be understood that the block 10 is secured to a rotating head (not shown). The bit '16 is assembled to the sleeve 25 by inserting the bit shank 17 into the sleeve bore 34, and is locked in position by insertion of pin 40 into the sleeve shank 26 and into the bit shank groove 41. The sleeve 25 is then assembled to the block 10 by inserting the sleeve shank 26 into the block bore 11, and is locked in place by insertion of the pin 36 into the block 10 and into the sleeve shank groove 37.

As the mining head (not shown) including the block 10 is rotated, the bit head 20 strikes the mine face at an angle so that the cutting tip 24 penetrates the mine face and dislodges material with a picking action. The material moves rearwardly along the bit head 20 and over the sleeve head 30. More particularly, the material being mined moves into the passages between the circumferentiallyspaced protuberances 42 and frictionally engages such protuberances 42 to cause a turning of the sleeve 25 and hence of the bit 16 carried in the sleeve 25. The material is discharged from the passages at the trailing end 32 of sleeve head 30 laterally out wardly of the outer block face 15. Because the bit 16 is rotated during each picking stroke, the bit head 20 is self-sharpened by substantially even wear. This selfsharpening action of the bit head 20 effectively increases the operating life of the bit 16.

I claim as my invention:

1. A bit and block assembly comprising:

a. a block movable along a mine face, the block being provided with a substantially cylindrical bore,

b. a sleeve rotatively mounted in the block bore, the

sleeve being provided with a substantially cylindrical bore and including an enlarged head,

0. a point-attack bit for removing material from the mine face including:

1. an elongate shank mounted in the sleeve bore,

2. an enlarged bit head integral and coaxial with the shank, the bit head having a leading end and a trailing end, and

3. a cutting tip on the leading end of the bit head penetrating the material being mined with a picking action upon travel of the bit along a mine face, and d. a plurality of protuberances on and extending outwardly from the periphery of the sleeve head, the protuberances extending generally longitudinally of and at an angle to the longitudinal axis of the sleeve, the protuberances providing frictional contact with the material being mined to effect positive turning of the sleeve, and hence of the bit in the sleeve, upon picking of the mine face by the bit head. 2. A bit and block assembly as defined in claim 1, in which:

e. the protuberances consist of fins that are relatively circumferentially spaced on the sleeve head. 3. A bit and block assembly as defined in claim 1, in which:

e. the protuberances consist of individual knobs in circumferentially spaced rows on the sleeve head.

4. A bit and block assembly as defined in claim 1, in which:

e. the block has a front face and an adjacent outer face, the block bore extending through the block front face,

f. the sleeve head with its protuberances, engages the block front face outwardly of the block bore to position the sleeve in the block, and

g. the bit head engages the sleeve head to position the bit in the sleeve.

5. A bit and block assembly as defined in claim 1, in

which:

e. the protuberances are circumferentially spaced about the periphery of the sleeve head to provide longitudinal passages therebetween extending from its leading end to its trailing end, the material being mined being movable through the passages and engageable with the protuberances,

f. the block has a front face and an adjacent outer face, the block bore extending through the block front face, and

g. the sleeve head with its protuberances engages the block front face outwardly of the block bore to position the sleeve in the block, and extends laterally outwardly beyond the outer block face vto enable discharge of the material being mined from the passages between the circumferentially spaced protuberances, and past the outer block face.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3361481 *Oct 18, 1965Jan 2, 1968Westinghouse Air Brake CoRotating cutter bit
US3476438 *Dec 18, 1967Aug 16, 1983 Title not available
US3499685 *Aug 8, 1968Mar 10, 1970Kennametal IncPick-type mining bit with support block having rotatable seat
US3652130 *Mar 2, 1970Mar 28, 1972Elders G WBit and block assembly
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3957307 *Sep 18, 1974May 18, 1976Olind VardaRough cutter mining tool
US4247150 *Apr 17, 1979Jan 27, 1981Voest-Alpine AktiengesellschaftBit arrangement for a cutting tool
US5131725 *Sep 4, 1990Jul 21, 1992Kennametal Inc.Rotatable cutting tool having an insert with flanges
US6176552 *Oct 5, 1998Jan 23, 2001Kennametal Inc.Cutting bit support member with undercut flange for removal
US6244665Feb 17, 1999Jun 12, 2001Kennametal Pc Inc.Cutting toolholder with recessed groove for cutting tool removal
US6354771Dec 2, 1999Mar 12, 2002Boart Longyear Gmbh & Co. KgCutting or breaking tool as well as cutting insert for the latter
US6786557Dec 20, 2000Sep 7, 2004Kennametal Inc.Protective wear sleeve having tapered lock and retainer
US7963615Nov 5, 2008Jun 21, 2011Alexander GreenspanMining and demolition tool
US8020940Dec 18, 2008Sep 20, 2011Gregory GreenspanMining and demolition tool
US8197011 *Jul 13, 2011Jun 12, 2012Gregory GreenspanMining and demolition tool
US8201892Dec 10, 2007Jun 19, 2012Hall David RHolder assembly
US8292372 *Dec 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
US8449040Oct 30, 2007May 28, 2013David R. HallShank for an attack tool
US8449041 *Oct 27, 2010May 28, 2013Sandvik Intellectual Property AbGrading pick with extended fins
US8454096Jun 26, 2008Jun 4, 2013Schlumberger Technology CorporationHigh-impact resistant tool
US8636325May 16, 2012Jan 28, 2014Gregory GreenspanMining and demolition tool
US20120104830 *Oct 27, 2010May 3, 2012Sandvik Intellectual Property AbGrading Pick With Extended Fins
DE3026930A1 *Jul 16, 1980Oct 15, 1981Cincinnati Mine Machinery CoEarthmoving, road levelling or mining machine cutter mounting - has base with tapered hole enclosing tapered wedged main piece (ZA 11.6.81)
DE3441949C1 *Nov 16, 1984Apr 24, 1986Paurat FDevice for holding the picks and for controlling the spray-medium feed in a cutting head for a heading machine
DE3441950C1 *Nov 16, 1984Apr 24, 1986Paurat GmbhDevice for holding the picks and for controlling the spray-medium feed in a cutting head for a heading machine
DE10160668C2 *Dec 11, 2001Oct 2, 2003Kennametal IncSchrämwerkzeug
EP0274645A1 *Dec 2, 1987Jul 20, 1988Kennametal Inc.Erosion resistant cutting bit with hardfacing
Classifications
U.S. Classification299/104, 175/354
International ClassificationE21C35/183, E21C35/00, E21C35/19, E21C35/18
Cooperative ClassificationE21C35/183, E21C2035/1816, E21C35/19
European ClassificationE21C35/19, E21C35/183