US3749188A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill bit
Assignee: GW Murphy Industries Inc
•
Filing: 1971-08-20
•
Granted: 1973-07-31
•
Expires: 1991-08-20
Abstract
Abstract A drill bit including at least one roller cutter rotatably mounted on a shaft which is supported between two legs of a saddle wherein the ends of the shaft are non-circular in cross section and fit with non-circular portions on the legs, the shaft being secured to the legs by bolt means passing diagonally through the shaft ends and one side of the mating saddle leg, whereby the shaft may be held against turning with respect to the saddle legs. This abstract is neither intended to define the invention of the application which, of course, is measured by the claims, nor is it intended to be limiting as to the scope of the invention in any way.
Inventors
- 👤 P Schumacher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:45
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/10; E21B10/22
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
141 words
In a drill bit comprising a head and a plurality of cutter assemblies supported on said head, at least one of said assemblies including: a saddle having spaced-apart legs, a bearing shaft extending between said legs; a roller cutter; bearing means rotatably supporting said cutter on the shaft between said legs; at least one of said legs having non-circular And non-parallel surfaces on the lower portion thereof; at least one end of said shaft being shaped to mate with said non-circular and non-parallel surfaces whereby the shaft is held against rotatable movement relative to said saddle leg; at least said one end of said shaft having a bore therein extending substantially diagonally; at least one leg of said saddle having a bore aligned with said shaft bore; and screw means in said bores adapted to secure said shaft to said leg.
Claim 2
Dependent Claim
141 words
In a drill bit comprising a head and a plurality of cutter assemblies supported on said head, at least one of said assemblies including: a saddle having spaced-apart legs, a bearing shaft extending between said legs; a roller cutter; bearing means rotatably supporting said cutter on the shaft between said legs; at least one of said legs having non-circular And non-parallel surfaces on the lower portion thereof; at least one end of said shaft being shaped to mate with said non-circular and non-parallel surfaces whereby the shaft is held against rotatable movement relative to said saddle leg; at least said one end of said shaft having a bore therein extending substantially diagonally; at least one leg of said saddle having a bore aligned with said shaft bore; and screw means in said bores adapted to secure said shaft to said leg.
Claim 3
Dependent Claim
42 words
A drill bit cutter assembly according to claim 1 wherein the bores in the end of the shaft and in the leg extend toward the head and rearwardly with respect to the direction of rotation of said head during the drilling operation.
Claim 4
Dependent Claim
42 words
A drill bit cutter assembly according to claim 1 wherein the bores in the end of the shaft and in the leg extend toward the head and forwardly with respect to the direction of rotation of said head during the drilling operation.
Claim 5
Dependent Claim
18 words
A drill bit cutter assembly according to claim 1 wherein the screw means includes a nut and bolt.
Claim 6
Dependent Claim
21 words
A drill bit cutter assembly according to claim 4 wherein a resilient member is positioned between the nut and said leg.
Claim 7
Dependent Claim
19 words
A drill bit cutter assembly according to claim 5 wherein the resilient member includes at least one Belleville spring.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |