US4043698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill attachment
Assignee: Individual
•
Filing: 1976-11-02
•
Granted: 1977-08-23
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Expires: 1996-11-02
Abstract
Abstract A follower is provided for a conventional flat drill bit which adapts the drill bit to provide a diametrally enlarged bore. The follower generally comprises a cylindrical section having a diametral slot therein in which the blade end of the bit is received. The well-bottom of the diametral slot includes a tapered socket in which the nose of the bit is received, the nose of the bit extending beyond the bottom wall of the cylindrical section. A means is provided for releasably mounting the follower on the drill bit. A bore in the work piece to be drilled is initiated by the nose of the bit extending through the follower thereon. As the nose penetrates into the work piece, the follower diametrally enlarges the bore provided thereby.
Inventors
- 👤 Rodney Chelberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:08
CPC Classifications
B; B23; B23B; B23B51/00; B23B51/10; B23B51/107; B23B2251/00; B23B2251/14; Y; Y10; Y10T; Y10T408/00; Y10T408/55; Y10T408/557; Y10T408/558; Y10T408/5583; Y10T408/5584; Y10T408/89; Y10T408/892; Y10T408/8923; Y10T408/902; Y10T408/96
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
133 words
A boring follower for a standard flat drill bit of the type having a shank mountable in a drill brace, a bit stem issuing therefrom and having a substantially flat paddle blade connected thereto including an axially extending tapered cutting nose, said boring follower comprising a cylindrical section having an axially extending diametral slot therein, said paddle blade of said bit being matingly engageable in said diametral slot, said diametral slot terminating in a radially extending well-bottom in said follower, an axially extending tapered socket in said well-bottom said tapered socket extending through said follower, said socket having a taper corresponding to said taper of said nose of said paddle blade, said nose of said paddle blade being registrable in said tapered socket, and means releasably fixing said follower on said paddle blade.
Claim 2
Dependent Claim
133 words
A boring follower for a standard flat drill bit of the type having a shank mountable in a drill brace, a bit stem issuing therefrom and having a substantially flat paddle blade connected thereto including an axially extending tapered cutting nose, said boring follower comprising a cylindrical section having an axially extending diametral slot therein, said paddle blade of said bit being matingly engageable in said diametral slot, said diametral slot terminating in a radially extending well-bottom in said follower, an axially extending tapered socket in said well-bottom said tapered socket extending through said follower, said socket having a taper corresponding to said taper of said nose of said paddle blade, said nose of said paddle blade being registrable in said tapered socket, and means releasably fixing said follower on said paddle blade.
Claim 3
Dependent Claim
39 words
The boring follower as claimed in claim 1, said means comprising a threaded radial aperture in said follower, and a set screw threadable therein, said set screw being engageable against said paddle blade for releasably fixing the position thereof.
Claim 4
Dependent Claim
25 words
The boring follower as claimed in claim 2, said threaded radial aperture in said follower being substantially perpendicular to said diametral slot in said follower.
References Cited (Backward Citations)
US413316A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-22 | 1981-02-21 | 1981-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-22 | 1985-02-21 | 1985-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-22 | 1989-02-21 | 1989-08-23 | $7700.00 | Window Closed / Lapsed |