US4684298A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill
Assignee: Santrade Ltd
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Filing: 1986-05-16
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Granted: 1987-08-04
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Expires: 2006-05-16
Abstract
Abstract The invention relates to a drill for metal drilling, comprising a drill body and a drill tip provided with cutting portions. The drill tip is detachably secured to the drill body by means of fastening devices, which are arranged on opposite sides of the centerline (CL) of the drill. The planar lower face of the drill tip is provided with a central tap which engages in a central recess in the mainly planar front surface of the drill body in order to center the drill tip relative to the drill body. A central fluid passage is formed in the drill body, which transforms into eccentrically arranged fluid passages in the drill tip. The fastening devices form at least partly walls in the eccentrical fluid passages.
Inventors
- 👤 Aage V. Roos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:29
CPC Classifications
B; B23; B23B; B23B51/00; B23B51/06; Y; Y10; Y10S; Y10S408/00; Y10S408/713; Y10T; Y10T408/00; Y10T408/44; Y10T408/45; Y10T408/455; Y10T408/89; Y10T408/909; Y10T408/9098; Y10T408/94; Y10T408/95
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
229 words
A rotary drill comprising a drill body, a drill tip, and fasteners securing said drill tip to a front end of said drill body; said drill body comprising front-to-rear extending first chip flutes, a generally planar front surface, a forwardly open recess disposed in said front surface along a longitudinal centerline of said drill body, first holes for receiving said fasteners, and fluid passages for conducting drilling fluid to said drill tip; said drill tip including a generally planar rear surface resting against said front surface, a tap projecting rearwardly from said rear surface and disposed in said recess, second chip flutes aligned with and forming forward extensions of said first chip flutes, cutting edges disposed at front ends of said second chip flutes, a plurality of longitudinally extending second holes aligned with said first holes, said first and second holes together defining fastener-receiving hole means for receiving said fasteners which extend between said drill body and said drill tip for urging said drill tip against said drill body and transmitting rotary forces from said drill body to said drill tip; and thin cylindrical collets positioned in said hole means between said fasteners and walls of said hole means, said collets formed of a softer material than said fasteners so as to be deformable to compensate for dimensional imprecisions between said fasteners and said walls of said hole means.
Claim 2
Dependent Claim
229 words
A rotary drill comprising a drill body, a drill tip, and fasteners securing said drill tip to a front end of said drill body; said drill body comprising front-to-rear extending first chip flutes, a generally planar front surface, a forwardly open recess disposed in said front surface along a longitudinal centerline of said drill body, first holes for receiving said fasteners, and fluid passages for conducting drilling fluid to said drill tip; said drill tip including a generally planar rear surface resting against said front surface, a tap projecting rearwardly from said rear surface and disposed in said recess, second chip flutes aligned with and forming forward extensions of said first chip flutes, cutting edges disposed at front ends of said second chip flutes, a plurality of longitudinally extending second holes aligned with said first holes, said first and second holes together defining fastener-receiving hole means for receiving said fasteners which extend between said drill body and said drill tip for urging said drill tip against said drill body and transmitting rotary forces from said drill body to said drill tip; and thin cylindrical collets positioned in said hole means between said fasteners and walls of said hole means, said collets formed of a softer material than said fasteners so as to be deformable to compensate for dimensional imprecisions between said fasteners and said walls of said hole means.
Claim 3
Dependent Claim
22 words
A drill according to claim 1, wherein said drill tip includes fluid passages aligned with said fluid passages of said drill body.
Claim 4
Dependent Claim
20 words
A drill according to claim 2, wherein said passages in said drill tip and drill body extend through said fasteners.
Claim 5
Dependent Claim
12 words
A drill according to claim 3, wherein said fasteners comprise hollow screws.
Claim 6
Dependent Claim
14 words
A drill according to claim 3, wherein said fasteners comprise hollow, radially resilient pins.
Claim 7
Dependent Claim
15 words
A drill according to claim 1, wherein said recess and tap are of cylindrical cross-section.
Claim 8
Dependent Claim
15 words
A drill according to claim 1, wherein said collets are disposed in said second holes.
References Cited (Backward Citations)
US1746716A
Cited
US2237901A
Cited
US2640378A
Cited
US3085453A
Cited
US4222690A
Cited
US4565473A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-03 | 1991-02-02 | 1991-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-03 | 1995-02-02 | 1995-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-03 | 1999-02-02 | 1999-08-04 | $7700.00 | Window Closed / Lapsed |