US3884593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for drilling aligned holes
Assignee: Individual
•
Filing: 1974-06-03
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Granted: 1975-05-20
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Expires: 1994-06-03
Abstract
Abstract Apparatus to be secured in the chuck of a portable power drill, for drilling holes in spaced panels, includes an elongated bit extension carrying a housing, longitudinally slidable and rotatable on the extension shaft. The housing is urged toward the leading end of the extension shaft, which carries the drilling bit. The housing includes a nose cone for centering the housing and bit extension in the first drilled hole; and the housing carries level indicating devices for either plumbing or leveling the bit extension to assure vertical or horizontal alignment of the second drilled hole. An anchor device secured to the power drill, prevents rotation of the housing relative to the drill.
Inventors
- 👤 Virgil F Christoffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:26
CPC Classifications
B; B23; B23B; B23B45/00; B23B45/003; B25; B25H; B25H1/00; B25H1/0021; B25H1/0078; B25H1/0085; Y; Y10; Y10T; Y10T408/00; Y10T408/21; Y10T408/55; Y10T408/557; Y10T408/558
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
117 words
Apparatus for use with a portable power drill for drilling aligned holes in closely spaced panels, comprising: an elongated shaft defining a drill bit extension having stop means at each end; a housing rotatably and slidably mounted on said shaft for relative sliding and rotational movement; an elongated coiled compression spring, disposed on said shaft, between said housing and the shaft stop means at the trailing end of the shaft, for continuously urging said housing along said shaft toward engagement with the shaft stop means at the leading end thereof; at least one level indicator means mounted on said housing to enable the drill operator to level said bit extension shaft in a selected orientation for drilling.
Claim 2
Dependent Claim
117 words
Apparatus for use with a portable power drill for drilling aligned holes in closely spaced panels, comprising: an elongated shaft defining a drill bit extension having stop means at each end; a housing rotatably and slidably mounted on said shaft for relative sliding and rotational movement; an elongated coiled compression spring, disposed on said shaft, between said housing and the shaft stop means at the trailing end of the shaft, for continuously urging said housing along said shaft toward engagement with the shaft stop means at the leading end thereof; at least one level indicator means mounted on said housing to enable the drill operator to level said bit extension shaft in a selected orientation for drilling.
Claim 3
Dependent Claim
62 words
Apparatus as set forth in claim 1 said at least one level indicator means including a first indicator means mounted on said housing in position to enable the drill operator to plumb said bit extension shaft during vertical drilling, and a second indicator means mounted on said housing to enable the drill operator to level said bit extension shaft during horizontal drilling.
Claim 4
Dependent Claim
44 words
Apparatus as set forth in claim 1 centering means mounted on said housing at its leading end; said centering means defining a conical structure having its axis coinciding with the rotational axis of said extension shaft, with its smaller end being the leading end.
Claim 5
Dependent Claim
52 words
Apparatus as set forth in claim 3 a bit for drilling a relatively large hole secured to the leading end of said bit extension; said centering means defining a flat surface; disposed in a plane parallel to the bit extension axis and spaced therefrom a distance corresponding to the drill bit radius.
Claim 6
Dependent Claim
74 words
Apparatus as set forth in claim 1 an anti-rotation assembly for said apparatus comprising a pair of elongated flexible members of equal length, annular elastic grommet means dimensioned to be stretched over the nose portion of the portable drill, means coupling one end of said respective flexible members to said grommet means at opposite sides thereof, and means on said housing for coupling one end of said respective flexible members at opposite sides thereof.
Claim 7
Dependent Claim
73 words
Apparatus as set forth in claim 5 said annular grommet means comprising two generally semi-circular elastic members, with their confronting ends being spaced from each other and being coupled by coupling pins rigidly coupling the confronting ends thereof; and said coupling pins defining journal members surrounded by links at the end of the flexible members to enable rolling of the grommet means relative to the flexible members and the nose of the drill.
Claim 8
Dependent Claim
44 words
Apparatus as set forth in claim 6 said elastic members having cross-sectional shaped means to enable unrestricted rolling of said grommet means over the nose of the drill in one direction and, which restrIcts the rolling of said grommet means in the reverse direction.
Claim 9
Dependent Claim
69 words
Apparatus as set forth in claim 1 said housing having a transverse shelf projecting therefrom, provided with a viewing hole; level indicator means including a first level indicator mounted on the leading side of said shelf overlying said viewing hole, for normal viewing from the leading side, and having a transparent base to enable viewing from the trailing or bottom side through said viewing hole during upward vertical drilling.
Claim 10
Dependent Claim
33 words
Apparatus as set forth in claim 8 said shelf having means for detachably mounting a second level indicator on the trailing side thereof, for viewing from the trailing side for downward vertical drilling.
Claim 11
Dependent Claim
46 words
Apparatus as set forth in claim 1 said housing having at least one planar wall parallel to the axis of said extension shaft; and said level indicator means including a first level indicator mounted on said planar wall for leveling said bit extension during horizontal drilling.
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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |