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US4065185A Expired / Lapsed US ⏱️ 0.0 years remaining

Point-attack bit

Assignee: Individual
•
Filing: 1976-07-22
•
Granted: 1977-12-27
•
Expires: 1996-07-22
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Abstract

Abstract A point-attack bit retained for rotation in a block bore, and used for removing material from a mine face. The bit has an elongate shank, and a head integral and coaxial with the shank, the head including a plurality of peripherally spaced, laterally projecting vanes extending generally longitudinally of the bit. Each vane is substantially triangular with a narrow leading end and a wider trailing end, and has sides that extend from the leading end to the trailing end. One of the vane sides has a different angle with respect to the longitudinal axis of the bit than the other vane side to provide different transverse forces on the vane sides upon contact with material being mined to effect a positive turning of the bit upon picking of the mine face. More particularly, the vane sides extend from the leading end to the trailing end on opposite sides of a longitudinal plane passed through the longitudinal axis of the bit and the leading end of the vane so that one vane side has a different included angle with respect to the longitudinal plane than the other vane side.

Inventors

  • 👤 Gerald W. Elders

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 13:44
CPC Classifications
E; E21; E21C; E21C35/00; E21C35/18

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 92 words
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 peripherally spaced, laterally projecting vanes extending generally longitudinally of the bit, each vane being substantially triangular with a narrow leading end and a wider trailing end, and having relatively diverging sides that extend from the leading end to the trailing end, and contact with material being mined to effect a positive turning of the bit upon picking of the mine face.
Claim 2
Dependent Claim 92 words
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 peripherally spaced, laterally projecting vanes extending generally longitudinally of the bit, each vane being substantially triangular with a narrow leading end and a wider trailing end, and having relatively diverging sides that extend from the leading end to the trailing end, and contact with material being mined to effect a positive turning of the bit upon picking of the mine face.
Claim 3
Dependent Claim 64 words
A point-attach bit as defined in claim 1, in which: c. one vane side of each vane has a different angle with respect to the longitudinal axis of the bit than the other vane side to provide different transverse forces on the vane sides upon contact with material being mined to effect a positive turning of the bit upon picking of the mine face.
Claim 4
Dependent Claim 99 words
A point-attack bit as defined in claim 1, in which: c. the vane sides of each vane extend from the leading end to the trailing end on opposite sides of a longitudinal plane passed through the longitudinal axis of the bit and the leading end of the vane, one vane side of each vane having a different included angle with respect to the longitudinal plane than the other vane side to provide different transverse forces on the vane sides on contact with material being mined to effect a positive turning of the bit upon picking of the mine face.
Claim 5
Dependent Claim 49 words
A point-attack bit as defined in claim 3, in which: d. in a transverse plane passed through the bit head, the height radially of the bit of one of the vane sides of each vane is different than the height radially of the bit of the other vane side.
Claim 6
Dependent Claim 43 words
A point-attack bit as defined in claim 3, in which: d. the vanes are peripherally spaced so that only one vane is disposed on each said longitudinal plane passed through the longitudinal axis of the bit and the leading end of each vane.
Claim 7
Dependent Claim 35 words
A point-attack bit as defined in claim 3, in which: d. the said longitudinal plane of each vane passes diametrically of the bit between a pair of peripherally spaced vanes without passing through another vane.
Claim 8
Dependent Claim 39 words
A point-attack bit as defined in claim 3, in which: d. each vane side of each vane has a side portion adjacent the trailing end that has a greater included angle than the side portion adjacent the leading end.

References Cited (Backward Citations)

US1550669A Cited
US3361481A Cited
US3652130A Cited
US3801158A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1980-12-26 1981-06-27 1981-12-27 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1984-12-26 1985-06-27 1985-12-27 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1988-12-26 1989-06-27 1989-12-27 $7700.00 Window Closed / Lapsed

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