Claims
- 1. A bit for mining coal, said bit being of the type wherein said bit is adapted to be forced into the exposed surface of the coal being mined, comprising
- an elongated metal base having a first end portion adapted to be rotatably mounted to a mining machine and having a second end portion,
- said second end portion being frustoconical and having therein a cylindrical hole extending along the longitudinal axis of said base,
- a tungsten carbide percussion tip having a cylindrical end portion, said end portion being disposed in said hole and affixed to said base,
- the portion of said tip extending from said base having a generally frustoconical surface and extending axially from said second end portion of said base, and
- said tip having at the end thereof opposite said cylindrical end portion an elongated flattened surface which is delineated by said generally frustoconical surface and which is elongated in a direction transverse to the principal longitudinal axis of said bit.
- 2. A bit according to claim 1 wherein said base comprises
- a base section formed of a first steel, and
- said second end portion being formed of a second steel different from said first steel.
- 3. A bit according to claim 2 wherein
- said second steel is non-sparking.
- 4. A bit according to claim 2 wherein
- said sections of said base are welded together.
- 5. A bit according to claim 1 wherein
- said tip has a diameter at the base of said frustoconical end portion which is not less than nine-sixteenths of an inch.
- 6. A bit according to claim 1 comprising
- a plurality of flats on said second end portion of said metal base.
- 7. A bit according to claim 6 wherein
- said second end portion has a distal end, and
- said flats extend rearwardly from said distal end of said second end portion.
- 8. A bit according to claim 1 comprising a plurality of angularly spaced flats on said second end portion of said metal base in juxtaposition with said generally frustoconical portion of said tip,
- said flats defining relief areas to cause intermittent rotation of said bit.
Parent Case Info
This is a continuation-in-part application of co-pending prior application Ser. No. 06/721,047, filed on Apr. 8, 1985, now abandoned, by Phillip A. Sollami and Jimmie L. Sollami for a Conical Bit.
US Referenced Citations (8)
Foreign Referenced Citations (3)
Number |
Date |
Country |
2633779 |
Feb 1978 |
DEX |
1114156 |
May 1968 |
GBX |
1419900 |
Dec 1975 |
GBX |
Non-Patent Literature Citations (2)
Entry |
Smith Mining Tools, "Conical Mining Bits", 10/1982. |
"Tooth-Type Insert Bits Get More Work", The Oil and Gas Journal, vol. 67, No. 30, 7-1969. |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
721047 |
Apr 1985 |
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