US3672455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drag bits
Assignee: TARTON IND Inc
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Filing: 1970-04-14
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Granted: 1972-06-27
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Expires: 1990-04-14
Abstract
Abstract An earth drilling bit of the drag type is provided having a body with a plurality of radial slots at one end, each having a portion extending across said one end from the axis, a plurality of L-shaped wings removably fitted in said slots and held in place by resilient means extending through passages in the body and wings.
Inventors
- 👤 James L Foster Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:16
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/62; E21B10/627; E21B10/36; E21B10/38
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
165 words
An earth drilling bit of the drag type adapted for rotation about its longitudinal axis comprising a body, a plurality of radial slots at one end having a portion extending across said one end from the axis, a plurality of L-shaped wings removably fitted in said slots, a passage through each said wings intermediate their ends, a like plurality of passages in said body intersecting each of said slots at a point axially offset from the passage in said wings when said wings are inserted in said slots and a resilient member extending through each of said passages biasing each of said wings in both a direction parallel to the longitudinal axis of the body and a direction transverse to the longitudinal axis of the body into tight engagement with the slot and body, each said wing extending radially beyond the body to provide a hole gauging portion and axially ahead of the said one end of the body to provide an end drilling face.
Claim 2
Dependent Claim
165 words
An earth drilling bit of the drag type adapted for rotation about its longitudinal axis comprising a body, a plurality of radial slots at one end having a portion extending across said one end from the axis, a plurality of L-shaped wings removably fitted in said slots, a passage through each said wings intermediate their ends, a like plurality of passages in said body intersecting each of said slots at a point axially offset from the passage in said wings when said wings are inserted in said slots and a resilient member extending through each of said passages biasing each of said wings in both a direction parallel to the longitudinal axis of the body and a direction transverse to the longitudinal axis of the body into tight engagement with the slot and body, each said wing extending radially beyond the body to provide a hole gauging portion and axially ahead of the said one end of the body to provide an end drilling face.
Claim 3
Dependent Claim
23 words
An earth drilling bit of the drag type as claimed in claim 1 wherein the resilient means is a spring steel roll pin.
Claim 4
Dependent Claim
38 words
An earth drilling bit of the drag type as claimed in claim 1 wherein the radial slot extends across said one end from the axis and vertically up the side of the body to form an L-shaped slot.
Claim 5
Dependent Claim
44 words
An earth drilling bit of the drag type as claimed in claim 1 wherein each wing has a forward face of generally planar form having a layer of hard abrasive resistant material secured to and over-laying said forward face to provide hard cutting edges.
Claim 6
Dependent Claim
44 words
An earth drilling bit of the drag type as claimed in claim 1 wherein the wings, in the portion extending ahead of the body, are in the form of stepped segments, the steps increasing in length ahead of the body from the axis outwardly.
Claim 7
Dependent Claim
50 words
An earth drilling bit of the drag type as claimed in claim 1 wherein each wing is a flat generally planar member having an L-shaped body engaging recess at one end and a plurality of stepped extensions at the other end forming a cutting edge extending ahead of said body.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |