US4252202A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill bit
Assignee: Individual
•
Filing: 1979-08-06
•
Granted: 1981-02-24
•
Expires: 1999-08-06
Abstract
Abstract A drill bit consisting of a tubular, main body member having a set of threads at one end thereof connectable to a drill stem and an annular mounting edge on an opposite end thereof, the mounting edge having a plurality of circumferentially spaced, longitudinally disposed recesses, the main body member having an enlarged annular portion adjacent the annular mounting edge, the enlarged portion of the main body member having a plurality of circumferentially spaced recesses disposed at an angle relative to the axis of the main body member, each of the recesses in the enlarged portion of the main body member being disposed between a set of recesses in the annular mounting edge and providing a pair of converging surfaces, a plurality of blades, each of the blades being disposed in a recess in the mounting edge, substantially radially relative to the axis of the main body member, having a recess receiving a wall portion of the main body member and a surface aligned with a surface of an adjacent set of the sets of converging surfaces, and a locking ring mountable on the main body member, having a plurality of fingers received in the recesses in the enlarged portion of the main body member, engaging a set of converging surfaces thereof and an aligned surface of the adjacent blade member in wedging relation for securing the blade members on the main body member.
Inventors
- 👤 James A. Purser, Sr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:32
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/62; E21B10/627; E21B10/633
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
162 words
A drill bit comprising a main body member having a longitudinally disposed opening therethrough, an end portion threadedly connectable to a drill stem and an opposite end portion defining a peripheral mounting edge, said mounting edge having a plurality of circumferentially spaced recesses, said main body portion having a plurality of circumferentially spaced sets of converging surfaces, each disposed between a set of recesses in said mounting edge, a plurality of blades, each of said blades being displaced in a recess in said mounting edge, having a recess receiving a wall portion of said main body member and a surface aligned with a surface of an adjacent set of said sets of coverging surfaces, and a locking ring mountable on said main body member, having a plurality of fingers, each engaging a set of converging surfaces of said main body member and an aligned surface of an adjacent blade member in wedging relation for securing said blades on said main body member.
Claim 2
Dependent Claim
162 words
A drill bit comprising a main body member having a longitudinally disposed opening therethrough, an end portion threadedly connectable to a drill stem and an opposite end portion defining a peripheral mounting edge, said mounting edge having a plurality of circumferentially spaced recesses, said main body portion having a plurality of circumferentially spaced sets of converging surfaces, each disposed between a set of recesses in said mounting edge, a plurality of blades, each of said blades being displaced in a recess in said mounting edge, having a recess receiving a wall portion of said main body member and a surface aligned with a surface of an adjacent set of said sets of coverging surfaces, and a locking ring mountable on said main body member, having a plurality of fingers, each engaging a set of converging surfaces of said main body member and an aligned surface of an adjacent blade member in wedging relation for securing said blades on said main body member.
Claim 3
Dependent Claim
56 words
A drill bit according to claim 1 wherein a side wall of each of said recesses in the mounting edge of said main body member is provided with a notch, and each blade member is provided with a protruding portion received in one of said notches when said blades are mounted on said main body member.
Claim 4
Dependent Claim
39 words
A drill bit according to claim 1 wherein each of said blades is provided with a longitudinally disposed ridge engaging an inner wall of said main body member when said blade member is mounted on said main body member.
Claim 5
Dependent Claim
37 words
A drill bit according to claim 1 wherein each of said blade members is provided with a tapered lug providing said surface of said blade member engagable with a finger of said locking ring in wedging relation.
Claim 6
Dependent Claim
24 words
A drill bit according to claim 2 wherein said tapered lug is spaced from a bottom surface of the recess of said blade member.
Claim 7
Dependent Claim
228 words
A drill bit comprising a tubular, main body member having a set of threads at one end thereof connectable to a drill stem and an annular mounting edge on an opposite end thereof, said mounting edge having a plurality of circumferentially spaced, longitudinally disposed recesses, said main body member having an enlarged annular portion adjacent said annular mounting edge, said enlarged portion of said main body member having a plurality of circumferentially spaced recesses disposed at an angle relative to the axis of said main body portion, each of said recesses in said enlaged portion being disposed between a set of recesses in said annular mounting edge and providing a pair of converging surfaces, a plurality of blades, each of said blades being disposed in a recess in said mounting edge, substantially radially relative to the axis of said main body member, having a recess receiving a wall portion of said main body member and a surface aligned with a surface of an adjacent set of said sets of converging surfaces, and a locking ring mountable on said main body member, having a plurality of fingers received in said recesses in the enlarged portion of said main body member, engaging a set of converging surfaces thereof and an aligned surface of said adjacent blade member in wedging relation for securing said blade members on said main body member.
Claim 8
Dependent Claim
228 words
A drill bit comprising a tubular, main body member having a set of threads at one end thereof connectable to a drill stem and an annular mounting edge on an opposite end thereof, said mounting edge having a plurality of circumferentially spaced, longitudinally disposed recesses, said main body member having an enlarged annular portion adjacent said annular mounting edge, said enlarged portion of said main body member having a plurality of circumferentially spaced recesses disposed at an angle relative to the axis of said main body portion, each of said recesses in said enlaged portion being disposed between a set of recesses in said annular mounting edge and providing a pair of converging surfaces, a plurality of blades, each of said blades being disposed in a recess in said mounting edge, substantially radially relative to the axis of said main body member, having a recess receiving a wall portion of said main body member and a surface aligned with a surface of an adjacent set of said sets of converging surfaces, and a locking ring mountable on said main body member, having a plurality of fingers received in said recesses in the enlarged portion of said main body member, engaging a set of converging surfaces thereof and an aligned surface of said adjacent blade member in wedging relation for securing said blade members on said main body member.
Claim 9
Dependent Claim
56 words
A drill bit according to claim 6 wherein a side wall of each of said recesses in the mounting edge of said main body member is provided with a notch, and each blade member is provided with a ridge received in one of said notches when said blade members are mounted on said main body member.
Claim 10
Dependent Claim
40 words
A drill bit according to claim 6 wherein each of said blade members is provided with a longitudinally disposed ridge engaging an inner wall of said main body member when said blade member is mounted on said main body member.
Claim 11
Dependent Claim
34 words
A drill bit according to claim 6 wherein each of said blade members is provided with a tapered lug providing said surface thereof engagable by a finger of said locking ring in wedging relation.
Claim 12
Dependent Claim
24 words
A drill bit according to claim 9 wherein said tapered lug is spaced from a bottom surface of the recess of said blade member.
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) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |