US3816018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boring bit
Assignee: Tatra np
•
Filing: 1972-10-06
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Granted: 1974-06-11
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Expires: 1992-10-06
Abstract
Abstract A boring bit comprising a hollow body having a cavity therein for the storage of a lubricant, a pair of discharge passages in communication with the cavity for directing the lubricant and a pair of cutting blades mounted in the bit. The body passages are each provided with an aligned straight-walled portion adapted to mount one of the cutting blades. At least two guide rollers are mounted in the body with their axes of rotation lying in planes substantially parallel with the rotational axis of the bit and substantially perpendicular to the planes of the cutting edges of the blades.
Inventors
- 👤 L Hlocky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:08
CPC Classifications
B; B23; B23B; B23B51/00; B23B51/06; B23B51/04; B23B51/0486; B23B51/0493; B23B2251/00; B23B2251/58; B23B51/063; Y; Y10; Y10S; Y10S408/00; Y10S408/713; Y10T; Y10T408/00; Y10T408/44; Y10T408/45; Y10T408/455; Y10T408/89; Y10T408/907; Y10T408/94
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
133 words
A boring bit having a pair of cutting blades comprising a hollow body portion provided with a cavity for the storage of a lubricant, said body terminating in a cutting head and having a pair of discharge passages in communication with said cavity for directing said lubricant therefrom, said body passages being each provided with a straight-walled portion to mount a cutting blade, the edges of said blades being aligned coplanar substantially parallel to the axis of the rotation of the bit, a guide roller being mounted in each of said body passages, said rollers being disposed substantially opposite each other and having their axes of rotation in a plane substantially parallel with the axis of rotation of said bit and substantially perpendicular to the planes of the cutting edges of said blades.
Claim 2
Dependent Claim
133 words
A boring bit having a pair of cutting blades comprising a hollow body portion provided with a cavity for the storage of a lubricant, said body terminating in a cutting head and having a pair of discharge passages in communication with said cavity for directing said lubricant therefrom, said body passages being each provided with a straight-walled portion to mount a cutting blade, the edges of said blades being aligned coplanar substantially parallel to the axis of the rotation of the bit, a guide roller being mounted in each of said body passages, said rollers being disposed substantially opposite each other and having their axes of rotation in a plane substantially parallel with the axis of rotation of said bit and substantially perpendicular to the planes of the cutting edges of said blades.
Claim 3
Dependent Claim
49 words
A boring bit according to claim 1 wherein the head of the bit terminates in a conical surface and said discharge passages extend through the body of the bit and terminate in openings in said conical surface in diametrically opposed relation to each other and between said straight-walled portions.
Claim 4
Dependent Claim
28 words
A boring bit according to claim 2 wherein a notch is provided in each of said straight-walled portions adapted to mechanically mount one of said cutting blades therein.
Claim 5
Dependent Claim
16 words
A boring bit according to claim 3 including detachable fastening means for removably mounting said blades.
Claim 6
Dependent Claim
29 words
A boring bit according to claim 1 wherein two of said guide rollers are provided, said guide rollers being positioned at substantially diametrically opposed points of the bit circumference.
References Cited (Backward Citations)
US3010345A
Cited
GB1200127A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |