US4078621A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling head
Assignee: Individual
•
Filing: 1976-06-01
•
Granted: 1978-03-14
•
Expires: 1996-06-01
Abstract
Abstract A drilling apparatus, especially for boring holes in the earth, having a drill as an integral unit including a first portion for starting the hole, a second portion for reaming the hole, and a third portion for maintaining the hole cylindrical. The drill is selectively fastened to a conventional auger. Extension plates may be attached to the third portion for drilling holes of different diameters. As an alternate embodiment, the first portion of the drill may include an auger, the drill and the auger being formed from a flat stock. At least some of the sides or cutting edges of the first, second or third portions being carbided or fabricated from extremely hard steel.
Inventors
- 👤 Donald M. Dewar
- 👤 James Wilseck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:12
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/58; E21B10/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
A drilling apparatus comprising: a first portion for starting the drilling; a second portion for boring a hole to a first predetermined diameter; a third portion having non-diverging parallel sides disposed perpendicular to said first predetermined diameter for maintaining said apparatus in a proper centered alignment; said first portion, said second portion, and said third portion being formed as a substantially flat integral unit from a single piece of flat steel stock; said first portion being adapted to be selectively connected to rotatable means for rotating said integral unit to drill a substantially smooth-sided hole; said first portion having carbided cutting edges; said second portion having carbided cutting edges; said non-diverging parallel sides of said third portion being carbided; and the apparatus being detachably connectable to an auger.
Claim 2
Dependent Claim
128 words
A drilling apparatus comprising: a first portion for starting the drilling; a second portion for boring a hole to a first predetermined diameter; a third portion having non-diverging parallel sides disposed perpendicular to said first predetermined diameter for maintaining said apparatus in a proper centered alignment; said first portion, said second portion, and said third portion being formed as a substantially flat integral unit from a single piece of flat steel stock; said first portion being adapted to be selectively connected to rotatable means for rotating said integral unit to drill a substantially smooth-sided hole; said first portion having carbided cutting edges; said second portion having carbided cutting edges; said non-diverging parallel sides of said third portion being carbided; and the apparatus being detachably connectable to an auger.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-13 | 1981-09-12 | 1982-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-13 | 1985-09-12 | 1986-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-13 | 1989-09-12 | 1990-03-14 | $7700.00 | Window Closed / Lapsed |