Self-sharpening bit and mounting therefor

Claim 2

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 point-attack bit including an elongate shank rotatively mounted in the block bore, c. a substantially conicaL head integral and coaxial with the shank, the head having a reduced diameter leading end and a larger diameter trailing end, and d. a cutting tip on the reduced diameter leading end of the head penetrating the material being mined with a scraping action upon travel of the bit along a mine face, e. spiral fins extending outwardly from the conical head and along the conical head from the leading to the trailing end, the spiral fins providing frictional contact with the material being mined to effect positive turning of the bit upon picking movement of the cutting tip along the mine face.

Claim 3

A bit and block assembly as defined in claim 1, in which: f. the substantially cylindrical bore extends through the block to provide an open rear bore end, g. spiral means having the same spiral direction as the spiral fins is provided on the shank for moving cuttings axially along the shank away from the conical head upon turning of the bit to discharge the cuttings from the bore through the open rear bore end out of the block.

Claim 4

a substantially conical head integral and coaxial with the shank, the head having a reduced diameter leading end and a larger diameter trailing end, and

Claim 5

a substantially conical head integral and coaxial with the shank, the head having a reduced diameter leading end and a larger diameter trailing end, and

Claim 6

a cutting tip on the reduced diameter leading end of the head penetrating the material being mined with a scraping action upon travel of the bit along a mine face, and c. a plurality of protuberances extending outwardly from the periphery of the conical head and along the conical head between the leading end and the trailing end, the protuberances having frictional contact with the material being mined to effect positive turning of the bit upon picking and scraping movement of the cutting tip and head along the mine face.

Claim 7

a cutting tip on the reduced diameter leading end of the head penetrating the material being mined with a scraping action upon travel of the bit along a mine face, and c. a plurality of protuberances extending outwardly from the periphery of the conical head and along the conical head between the leading end and the trailing end, the protuberances having frictional contact with the material being mined to effect positive turning of the bit upon picking and scraping movement of the cutting tip and head along the mine face.

Claim 8

In a cutter bit for mining machines and the like and in combination with a mining machine cutter block movable along a mine face and forming a support for the bit, a generally frusto-conical head having a reduced diameter leading end and a large diameter trailing end, a concentric shank extending from the large diameter trailing end of said head for rotatable mounting in the mining machine cutter block, a hardened cutting tip recessed in and bonded to the small diameter leading end of said head and extending axially therefrom and having a generally conical cutting tip penetrating the material being mined with a scraping action upon travel of the bit along a mine face, and spiral ribs extending along said conical head from the leading to the trailing end thereof and providing the frictional contact with the material being mined to effect positive turning of the bit within the cutter block upon cutting movement of said cutting tip along a mine face.

Claim 9

In a cutter bit for mining machines and the like and in combination with a mining machine cutter block movable along a mine face and forming a support for the bit, a generally frusto-conical head having a reduced diameter leading end and a large diameter trailing end, a concentric shank extending from the large diameter trailing end of said head for rotatable mounting in the mining machine cutter block, a hardened cutting tip recessed in and bonded to the small diameter leading end of said head and extending axially therefrom and having a generally conical cutting tip penetrating the material being mined with a scraping action upon travel of the bit along a mine face, and spiral ribs extending along said conical head from the leading to the trailing end thereof and providing the frictional contact with the material being mined to effect positive turning of the bit within the cutter block upon cutting movement of said cutting tip along a mine face.

Claim 10

A cutter bit in accordance with claim 3, wherein the shank has an outwardly opening recess extending thereabout wherein a pin mounted in the cutter block and extending chordally of the shank, extends along said recess to accommodate rotation of said bit within said cutter block and to retain said bit to said block, and wherein the spiral ribs are uniform in cross section throughout their length, leaving furrows therebetween increasing in width from the leading to the trailing end of the bit.

Claim 11

In a cutter bit, a cutter block therefor of a type moving along the mine face as it is advanced into the mine face, a cylindrical shank rotatably mounted in said cutter block and supporting the bit at a cutting angle with respect to a mine face, a generally frusto-conical head extending from said shank and tapering toward its outer end, a generally conical cutter tip inserted in and bonded to the end of said head and extending axially therefrom, the frusto-conical face of said head having helical convolutions in the form of spiral ribs extending for the length of said face to effect positive rotation of said bit by the wedging of said ribs into the material being mined during the operation of advancing said tip into and along a mine face, to effect a mining operation.

Claim 12

In a cutter bit, a cutter block therefor of a type moving along the mine face as it is advanced into the mine face, a cylindrical shank rotatably mounted in said cutter block and supporting the bit at a cutting angle with respect to a mine face, a generally frusto-conical head extending from said shank and tapering toward its outer end, a generally conical cutter tip inserted in and bonded to the end of said head and extending axially therefrom, the frusto-conical face of said head having helical convolutions in the form of spiral ribs extending for the length of said face to effect positive rotation of said bit by the wedging of said ribs into the material being mined during the operation of advancing said tip into and along a mine face, to effect a mining operation.

Claim 13

A cutter bit in accordance with claim 5, wherein the ribs are of a generally V-shaped cross section throughout their length and have furrows therebetween opening to the end of the head supporting the tip and increasing in width from the leading to the trailing end thereof to provide a self-cleaning serrated end portion of said head wedging into and rotating said bit during the operation of advancing said tip into and along a mine face, to effect a cutting operation.

Claim 14

The structure of claim 6, wherein the shank has an outwardly opening annular recessed portion extending thereabout, wherein a pin extending through said block is slidably engaged by said recesseD portion to accomdate rotation of said bit in said block and to retain said bit thereto, and wherein the ribs are V-shaped in cross section and of uniform cross section throughout their length and leave furrows therebetween increasing in width from the leading to the trailing end of said cutter bit.

Claim 15

A point-attack bit for removing material from a mine face comprising: a. an elongate shank, b. a substantially conical head integral and coaxial with the shank, the head having a reduced diameter leading end and a larger diameter trailing end, and c. a plurality of protuberances on and extending outwardly from the periphery of the conical head, the protuberances providing frictional contact with the material being mined to effect positive turning of the bit upon picking the mine face by the conical head.

Claim 16

A point-attack bit for removing material from a mine face comprising: a. an elongate shank, b. a substantially conical head integral and coaxial with the shank, the head having a reduced diameter leading end and a larger diameter trailing end, and c. a plurality of protuberances on and extending outwardly from the periphery of the conical head, the protuberances providing frictional contact with the material being mined to effect positive turning of the bit upon picking the mine face by the conical head.

Claim 17

A point-attack bit as defined in claim 8, in which: d. the protuberances are provided about the periphery of the conical head between the leading end and the trailing end, at least one of the protuberances being in position to frictionally engage the material being mined to effect positive turning.

Claim 18

A point-attack bit as defined in claim 9, in which: e. the protuberances are circumferentially spaced relatively so that at least one of the protuberances will frictionally engage the material being mined to effect positive turning.

Claim 19

A point-attack bit as defined in claim 10, in which: f. the protuberances consist of a plurality of individual knobs formed on and projecting laterally outwardly from the periphery of the conical head.

Claim 20

A point-attack bit as defined in claim 10, in which: f. the protuberances consist of fins on and extending the length of the conical head from the leading to the trailing end, and projecting laterally outwardly from the periphery of the conical head.

Claim 21

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 point-attack bit including:

Claim 22

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 point-attack bit including:

Claim 23

A bit and block assembly as defined in claim 13, in which: d. the protuberances are provided about the periphery of the conical head between the leading end and the trailing end, at least one of the protuberances being in position to frictionally engage the material being mined to effective positive turning.

Claim 24

A bit and block assembly as defined in claim 14, in which: e. the protuberances are circumferentially spaced relatively so that at least one of the protuberances will frictionally engage the material being mined to effect positive turning.

Claim 25

A bit and block assembly as defined in claim 15, in which: f. the protuberances consist of a plurality of individual knobs formed and projecting laterally outwardly from the periphery of the conical head.

Claim 26

A bit and block assembly as defined in claim 15, in which: f. the protuberances consist of fins on and extending along the length of the conical head from the leading to the trailing end, and projecting laterally outwardly from the periphery of the conical head.

Claim 27

A point-attack bit for removing material from a mine face, comprising: a. An elongate shank, and b. A head integral and coaxial with the shank, the head including a plurality of laterally projecting fins extending generally longitudinally of the bit yet at an angle to the longitudinal axis of the bit, the fins providing frictional contact with the material being mined to effect a positive turning of the bit upon picking of the mine face by the head.

Claim 28

A point-attack bit for removing material from a mine face, comprising: a. An elongate shank, and b. A head integral and coaxial with the shank, the head including a plurality of laterally projecting fins extending generally longitudinally of the bit yet at an angle to the longitudinal axis of the bit, the fins providing frictional contact with the material being mined to effect a positive turning of the bit upon picking of the mine face by the head.

Claim 29

A point-attack bit as defined in claim 18, in which: c. the head including the fins provides a substantially conical profile having a reduced leading end and a larger trailing end.