US3888049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for grinding rock bit inserts
Assignee: Individual
•
Filing: 1973-09-28
•
Granted: 1975-06-10
•
Expires: 1993-09-28
Abstract
Abstract Apparatus for grinding inserts in the head of a rock drill bit uses a cup shaped grinding wheel having a planar lip; the bit is held in a vice and the planar lip is movable across the insert and also to a limited extent into the insert, which limitation is effected by incorporating a spring acting against the support. The grinding wheel is vibrated during the grinding process.
Inventors
- 👤 George Macsween
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:28
CPC Classifications
B; B24; B24B; B24B3/00; B24B3/24; B24B3/33
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
148 words
Apparatus for grinding the surface of an insert located at one end of a rock drill bit body comprising means for holding said body to locate said insert in a predetermined position, a driven cup shaped grinding wheel having a planar lip, moveable support means for said wheel comprising a first transversely rotatable arm and a second transversely rotatable arm rotatable with respect to said first arm, said grinding wheel being located on said second arm, whereby said planar lip of said grinding wheel is transversely moveable across said insert during grinding; and means acting between said support means providing limited movement of said planar lip into said insert, comprising a member pivoted on said first arm about a transverse axis and secured to said second arm, stop means on said first arm, and biasing means supported by said first arm urging said member away from said stop.
Claim 2
Dependent Claim
148 words
Apparatus for grinding the surface of an insert located at one end of a rock drill bit body comprising means for holding said body to locate said insert in a predetermined position, a driven cup shaped grinding wheel having a planar lip, moveable support means for said wheel comprising a first transversely rotatable arm and a second transversely rotatable arm rotatable with respect to said first arm, said grinding wheel being located on said second arm, whereby said planar lip of said grinding wheel is transversely moveable across said insert during grinding; and means acting between said support means providing limited movement of said planar lip into said insert, comprising a member pivoted on said first arm about a transverse axis and secured to said second arm, stop means on said first arm, and biasing means supported by said first arm urging said member away from said stop.
Claim 3
Dependent Claim
58 words
Apparatus according to claim 1 wherein said stop means is positioned whereby manual pressure on said second arm against the action of said biasing means brings said planar lip into a substantially horizontal position in grinding contact with said insert surface, and wherein said means for holding said body includes a base bracket for supporting a cylindrical member.
Claim 4
Dependent Claim
59 words
Apparatus according to claim 1 having means vibrating said grinding wheel during grinding and wherein said bracket base supports a cylindrical member, said bit body being located therein, toothed abutments in said bracket, chain means around said cylindrical member and means acting on said chain means to move said cylindrical member whereby said bit body engages said toothed abutments.
Claim 5
Dependent Claim
31 words
Apparatus according to claim 3, wherein said cylindrical member has a vertical slot wider than said toothed abutments to receive same when said cylindrical member is activated by said chain means.
Claim 6
Dependent Claim
25 words
Apparatus according to claim 3, having means acting on said cylindrical member to disengage it from said toothed abutments on release of said chain means.
References Cited (Backward Citations)
US115068A
Cited
US515801A
Cited
US1054662A
Cited
US1179850A
Cited
US2055361A
Cited
US2751718A
Cited
US2849839A
Cited
US3451171A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |