Patent US3309757A successfully refreshed from Google Patents.
US3309757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boring bars
Assignee: Individual
•
Filing: 1966-04-01
•
Granted: 1967-03-21
•
Expires: 1986-04-01
Abstract
No abstract record available.
Inventors
- 👤 Konwal Ignatius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:38
CPC Classifications
B; B23; B23B; B23B27/00; B23B27/14; B23B27/16; B23B27/1666; B23B27/007; Y; Y10; Y10T; Y10T407/00; Y10T407/22; Y10T407/2272; Y10T407/2282; Y10T407/2286
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
206 words
IN COMBINATION, A TOOL HOLDER COMPRISING (A) A BAR HAVING AT ONE END PORTION A BIT-RECEIVING CAVITY, (B) A BIT MOUNTED IN SAID CAVITY, (C) AN ELONGATED COUNTERBORE FORMED IN SAID BAR AT ONE SIDE OF AND OPENING INTO SAID CAVITY, (D) THE TOP SURFACE OF SAID BIT WHEN MOUNTED IN SAID CAVITY BEING IN A PLANE ABOVE THE BOTTOM SURFACE OF SAID COUNTERBORE AND BELOW THE TOP SURFACE OF SAID BAR, (E) SAID BAR HAVING AN OPENING FORMED THEREIN CENTRALLY WITH RESPECT TO SAID COUNTERBORE, (F) A CLAMPING SCREW HAVING AN ENLARGED HEAD AND A RESILIENT SHANK THREADED INTO SAID OPENING, (G) SAID HEAD BEING OF A DIAMETER LESS THAN THE ELONGATED LENGTH AND GREATER THAN THE WIDTH OF SAID COUNTERBORE SO AS TO SPAN THE WIDTH OF SAID COUNTERBORE WHEN INITIALLY THREADED INTO SAID OPENING FORMED IN SAID BAR, SAID HEAD HAVING A PORTION BEARING UPON THE TOP SURFACE OF SAID BAR AND AN EQUAL PORTION CLAMPINGLY BEARING UPON THE TOP SURFACE OF SAID BIT WHEN SAID CLAMPING SCREW IS FURTHER THREADED INTO SAID OPENING WITH ITS RESILIENT SHANK BIASED TO CANT SAID HEAD INTO CLAMPING ENGAGEMENT WITH SAID TOP SURFACE OF SAID BIT BELOW THE PLAIN OF THE TOP SURFACE OF SAID BAR.
Claim 2
Dependent Claim
206 words
IN COMBINATION, A TOOL HOLDER COMPRISING (A) A BAR HAVING AT ONE END PORTION A BIT-RECEIVING CAVITY, (B) A BIT MOUNTED IN SAID CAVITY, (C) AN ELONGATED COUNTERBORE FORMED IN SAID BAR AT ONE SIDE OF AND OPENING INTO SAID CAVITY, (D) THE TOP SURFACE OF SAID BIT WHEN MOUNTED IN SAID CAVITY BEING IN A PLANE ABOVE THE BOTTOM SURFACE OF SAID COUNTERBORE AND BELOW THE TOP SURFACE OF SAID BAR, (E) SAID BAR HAVING AN OPENING FORMED THEREIN CENTRALLY WITH RESPECT TO SAID COUNTERBORE, (F) A CLAMPING SCREW HAVING AN ENLARGED HEAD AND A RESILIENT SHANK THREADED INTO SAID OPENING, (G) SAID HEAD BEING OF A DIAMETER LESS THAN THE ELONGATED LENGTH AND GREATER THAN THE WIDTH OF SAID COUNTERBORE SO AS TO SPAN THE WIDTH OF SAID COUNTERBORE WHEN INITIALLY THREADED INTO SAID OPENING FORMED IN SAID BAR, SAID HEAD HAVING A PORTION BEARING UPON THE TOP SURFACE OF SAID BAR AND AN EQUAL PORTION CLAMPINGLY BEARING UPON THE TOP SURFACE OF SAID BIT WHEN SAID CLAMPING SCREW IS FURTHER THREADED INTO SAID OPENING WITH ITS RESILIENT SHANK BIASED TO CANT SAID HEAD INTO CLAMPING ENGAGEMENT WITH SAID TOP SURFACE OF SAID BIT BELOW THE PLAIN OF THE TOP SURFACE OF SAID BAR.
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) | 1970-03-20 | 1970-09-19 | 1971-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-20 | 1974-09-19 | 1975-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-20 | 1978-09-19 | 1979-03-21 | $7700.00 | Window Closed / Lapsed |