US3654690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for removing broken studs
Assignee: Individual
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Filing: 1970-07-02
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Granted: 1972-04-11
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Expires: 1990-07-02
Abstract
Abstract A method for removing a broken threaded member from a tapped bore including a drill bit adapted for rotation in the same direction required to withdraw the broken threaded member and in which a portion of the drill bit between the ends thereof has an expanding diameter to increase the torque for removing the broken threaded member when the drill bit had drilled sufficiently into the broken threaded member to reach the expanding portion.
Inventors
- 👤 Wise J Hardin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:19
CPC Classifications
B; B25; B25B; B25B27/00; B25B27/14; B25B27/18; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49815; Y10T29/49821; Y10T29/53; Y10T29/53687; Y10T408/00; Y10T408/03
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
84 words
A method of removing broken threaded members from a tapped bore comprising in combination the steps of drilling coaxially along the longitudinal axis of said broken threaded member, said drill bit being rotated in the same direction required to withdraw said broken threaded member from said tapped bore and increasing the torque on said broken threaded member by continuing said drilling through an expanding diameter portion on said drill bit thereby increasing the torque to remove said broken threaded member from said tapped bore.
Claim 2
Independent Claim
84 words
A method of removing broken threaded members from a tapped bore comprising in combination the steps of drilling coaxially along the longitudinal axis of said broken threaded member, said drill bit being rotated in the same direction required to withdraw said broken threaded member from said tapped bore and increasing the torque on said broken threaded member by continuing said drilling through an expanding diameter portion on said drill bit thereby increasing the torque to remove said broken threaded member from said tapped bore.
Claim 3
Dependent Claim
44 words
The method in accordance with claim 1 including maintaining a substantially constant drilling pressure on said broken threaded member until said expanded diameter portion of said drill is reached and on increasing said pressure when the said expanding diameter of said drill bit begins.
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) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |