US3256946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hammer drill
Assignee: HUYGMETAAL NV
•
Filing: 1963-05-14
•
Granted: 1966-06-21
•
Expires: 1983-05-14
Abstract
No abstract record available.
Inventors
- 👤 Jansen Johann Wilhelm
- 👤 Hoffmann Hendrik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:11
CPC Classifications
B; B25; B25D; B25D11/00; B25D11/06; B25D11/10; B25D11/102
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
234 words
A HAMMER DRILL COMPRISING, IN COMBINATION, A MO TOR HAVING A BEARING AND A DRIVE SHAFT EXTENDING WITH AN END PORTION THEREOF THROUGH SAID BEARING END; A TUBULAR SUPPORT FIXED AT ONE END THEREOF TO SAID BEARING END OF SAID MOTOR AND PROJECTING THEREFROM SUBSTANTIALLY COAXIALLY WITH THE DRIVE SHAFT; A HOLLOW SHAFT ARRANGED IN SAID TUBULAR SUPPORT SPACED FROM THE INNER SURFACE THEREOF AND COAXIAL WITH SAID DRIVE SHAFT, SAID HOLLOW SHAFT BEING FORMED INTERMEDIATE THE ENDS THEREOF WITH AT LEAST TWO LONGITUDINALLY EXTENDING SLOTS; COUPLING MEANS CONNECTING SAID END PORTION OF SAID DRIVE SHAFT WITH ONE END OF SAID HOLLOW SHAFT; ANTI-FRICTION BEARING MEANS BETWEEN THE OTHER END OF SAID TUBULAR SUPPORT AND THE OTHER END OF SAID HOLLOW SHAFT; A STRIKER HAMMER SLIDABLY GUIDED IN SAID HOLLOW SHAFT FOR RECIPROCATING MOVEMENT IN LONGITUDINAL DIRECTION OF THE LATTER; SPRING MEANS IN SAID HOLLOW SHAFT AND ENGAGING SAID STRIKER HAMMER AND BIASED TO MOVE THE LATTER IN A DIRECTION TOWARD SAID OTHER END OF SAID HOLLOW SHAFT; CONTROL MEANS FOR MOVING, DURING ROTATION OF SAID HOLLOW SHAFT THROUGH A GIVEN ANGLE, SAID STRIKER HAMMER IN A DIRECTION TOWARD SAID ONE END OF THE SAID HOLLOW SHAFT TO STRESS THEREBY SAID SPRING MEANS AND FOR RELEASING SAID STRIKER HAMMER DURING FURTHER ROTATION OF SAID HOLLOW SHAFT SO THAT SAID STRIKER HAMMER IS DRIVEN BY SAID SPRING MEANS TOWARD SAID OTHER END OF SAID HOLLOW
Claim 2
Dependent Claim
234 words
A HAMMER DRILL COMPRISING, IN COMBINATION, A MO TOR HAVING A BEARING AND A DRIVE SHAFT EXTENDING WITH AN END PORTION THEREOF THROUGH SAID BEARING END; A TUBULAR SUPPORT FIXED AT ONE END THEREOF TO SAID BEARING END OF SAID MOTOR AND PROJECTING THEREFROM SUBSTANTIALLY COAXIALLY WITH THE DRIVE SHAFT; A HOLLOW SHAFT ARRANGED IN SAID TUBULAR SUPPORT SPACED FROM THE INNER SURFACE THEREOF AND COAXIAL WITH SAID DRIVE SHAFT, SAID HOLLOW SHAFT BEING FORMED INTERMEDIATE THE ENDS THEREOF WITH AT LEAST TWO LONGITUDINALLY EXTENDING SLOTS; COUPLING MEANS CONNECTING SAID END PORTION OF SAID DRIVE SHAFT WITH ONE END OF SAID HOLLOW SHAFT; ANTI-FRICTION BEARING MEANS BETWEEN THE OTHER END OF SAID TUBULAR SUPPORT AND THE OTHER END OF SAID HOLLOW SHAFT; A STRIKER HAMMER SLIDABLY GUIDED IN SAID HOLLOW SHAFT FOR RECIPROCATING MOVEMENT IN LONGITUDINAL DIRECTION OF THE LATTER; SPRING MEANS IN SAID HOLLOW SHAFT AND ENGAGING SAID STRIKER HAMMER AND BIASED TO MOVE THE LATTER IN A DIRECTION TOWARD SAID OTHER END OF SAID HOLLOW SHAFT; CONTROL MEANS FOR MOVING, DURING ROTATION OF SAID HOLLOW SHAFT THROUGH A GIVEN ANGLE, SAID STRIKER HAMMER IN A DIRECTION TOWARD SAID ONE END OF THE SAID HOLLOW SHAFT TO STRESS THEREBY SAID SPRING MEANS AND FOR RELEASING SAID STRIKER HAMMER DURING FURTHER ROTATION OF SAID HOLLOW SHAFT SO THAT SAID STRIKER HAMMER IS DRIVEN BY SAID SPRING MEANS TOWARD SAID OTHER END OF SAID HOLLOW
References Cited (Backward Citations)
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US1925289A
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US2191608A
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US2724573A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-06-20 | 1969-12-20 | 1970-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-20 | 1973-12-20 | 1974-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-20 | 1977-12-20 | 1978-06-21 | $7700.00 | Window Closed / Lapsed |