US3975110A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flat beaded double end track bit
Assignee: AEW ELECTRIC Inc LOS ANGELES CA
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Filing: 1975-10-06
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Granted: 1976-08-17
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Expires: 1995-10-06
Abstract
Abstract The improved flat beaded track bit disclosed herein comprises an elongated, generally rectangular member having first and second ends separated by a middle section. First and second drill bodies are formed on the first and second ends, respectively, of the member, with the drill bodies being identical, but mirror images of each other. The lands of the first and second drill bodies terminate adjacent to the middle section of the member, and the diameters of the lands of the drill bodies are larger adjacent to the first and second ends of the member than adjacent to the middle section of the member.
Inventors
- 👤 Gerald G. Kraiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:41
CPC Classifications
B; B23; B23B; B23B51/00; B23B2251/00; B23B2251/14; Y; Y10; Y10T; Y10T408/00; Y10T408/89; Y10T408/909; Y10T408/9093; Y10T408/9095
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
641 words
An improved flat beaded track bit comprising: an elongated, generally rectangular member having a first end, a second end and middle section, disposed midway between the first and second ends, and including first and second flat, substantially parallel, side surfaces extending between the first and second ends and curved, upper and lower surfaces extending between the side surfaces and between the first and second ends, with a first longitudinal edge joining the first side surface and the upper surface, a second longitudinal edge joining the second side surface and the upper surface, a third longitudinal edge joining the first side surface and the lower surface and a fourth longitudinal edge joining the second side surface and the lower surface and with each of the first, second, third and fourth longitudinal edges extending, from one end to the other, between the first end to the second end of the member; a first longitudinal bead formed on the first side surface, disposed midway between the first and third edges and extending between the first and third edges and extending between the first and second ends of the member; a second longitudinal bead formed on the second side surface, disposed midway between the second and fourth edges and extending between the first and second ends of the member, the first and second side surfaces, including the first and second longitudinal beads, constituting the shank portions of the track bit and being adapted to be held by a machine which may then be utilized to rotate the member about its central longitudinal axis; a first drill body formed on the first end of the body and including a centrally disposed first chisel edge and first and second cutting lips, with the first lip extending from the first chisel edge to adjacent to one end of the first longitudinal edge and with the second lip extending from the first chisel edge to adjacent to one end of the fourth longitudinal edge; a first margin formed on the upper surface and along the first longitudinal edge, from its one end to adjacent to the middle section of the member, with the remaining land portion of the upper surface, between the first and second longitudinal edges and between the first end and the middle section of the member, having a reduced diameter body diameter clearance; a second margin formed on the lower surface and along the fourth longitudinal edge, from its one end to the middle section of the member, with the remaining land portion of the lower surface, between the third and fourth longitudinal edges and between the one end and the middle section of the member, having a reduced diameter body diameter clearance; a second drill body formed on the second end of the member and including a centrally disposed second chisel edge and third and fourth cutting lips, with the third lip extending from the second chisel edge to adjacent to the other end of the second longitudinal edge and with the fourth lip extending from the second chisel edge to adjacent to the other end of the fourth longitudinal edge; a third margin formed on the upper surface and along the second longitudinal edge, from its other end to adjacent to the middle section of the member, with the remaining land portion of the upper surface, between the first and second longitudinal edges and between the second end and the middle section of the member, having a reduced diameter body diameter clearance; a fourth margin formed on the lower surface and along the third longitudinal edge, from its other end to adjacent to the middle section of the member, with the remaining land portion of the lower surface, between the third and fourth longitudinal edges and between the other end and the middle section of the member, having a reduced diameter body diameter clearance.
Claim 2
Dependent Claim
641 words
An improved flat beaded track bit comprising: an elongated, generally rectangular member having a first end, a second end and middle section, disposed midway between the first and second ends, and including first and second flat, substantially parallel, side surfaces extending between the first and second ends and curved, upper and lower surfaces extending between the side surfaces and between the first and second ends, with a first longitudinal edge joining the first side surface and the upper surface, a second longitudinal edge joining the second side surface and the upper surface, a third longitudinal edge joining the first side surface and the lower surface and a fourth longitudinal edge joining the second side surface and the lower surface and with each of the first, second, third and fourth longitudinal edges extending, from one end to the other, between the first end to the second end of the member; a first longitudinal bead formed on the first side surface, disposed midway between the first and third edges and extending between the first and third edges and extending between the first and second ends of the member; a second longitudinal bead formed on the second side surface, disposed midway between the second and fourth edges and extending between the first and second ends of the member, the first and second side surfaces, including the first and second longitudinal beads, constituting the shank portions of the track bit and being adapted to be held by a machine which may then be utilized to rotate the member about its central longitudinal axis; a first drill body formed on the first end of the body and including a centrally disposed first chisel edge and first and second cutting lips, with the first lip extending from the first chisel edge to adjacent to one end of the first longitudinal edge and with the second lip extending from the first chisel edge to adjacent to one end of the fourth longitudinal edge; a first margin formed on the upper surface and along the first longitudinal edge, from its one end to adjacent to the middle section of the member, with the remaining land portion of the upper surface, between the first and second longitudinal edges and between the first end and the middle section of the member, having a reduced diameter body diameter clearance; a second margin formed on the lower surface and along the fourth longitudinal edge, from its one end to the middle section of the member, with the remaining land portion of the lower surface, between the third and fourth longitudinal edges and between the one end and the middle section of the member, having a reduced diameter body diameter clearance; a second drill body formed on the second end of the member and including a centrally disposed second chisel edge and third and fourth cutting lips, with the third lip extending from the second chisel edge to adjacent to the other end of the second longitudinal edge and with the fourth lip extending from the second chisel edge to adjacent to the other end of the fourth longitudinal edge; a third margin formed on the upper surface and along the second longitudinal edge, from its other end to adjacent to the middle section of the member, with the remaining land portion of the upper surface, between the first and second longitudinal edges and between the second end and the middle section of the member, having a reduced diameter body diameter clearance; a fourth margin formed on the lower surface and along the third longitudinal edge, from its other end to adjacent to the middle section of the member, with the remaining land portion of the lower surface, between the third and fourth longitudinal edges and between the other end and the middle section of the member, having a reduced diameter body diameter clearance.
Claim 3
Dependent Claim
148 words
The improved flat beaded track bit described in claim 1 wherein the surfaces of the first, second, third and fourth margins and of the remaining land portions of the upper and lower surfaces are continuous from the ends of the member to the middle section of the member; wherein the lengths of radii defining the first and second margins and the remaining portions of the upper and lower surfaces adjacent to the first end of the member, are greater adjacent to the one end of the longitudinal edges than adjacent to the middle section of the member; and wherein the lengths of the radii defining the third and fourth margins and the remaining portions of the upper and lower surfaces, adjacent to the second end of the member, are greater adjacent to the other ends of the longitudinal edges than adjacent to the middle section of the member.
Claim 4
Dependent Claim
27 words
The improved flat beaded track bit described in claim 2 wherein the first drill body is identical to but a mirror image of the second drill body.
References Cited (Backward Citations)
US1131991A
Cited
US2977828A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-17 | 1980-02-16 | 1980-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-17 | 1984-02-16 | 1984-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-17 | 1988-02-16 | 1988-08-17 | $7700.00 | Window Closed / Lapsed |