Patent US3067319A successfully refreshed from Google Patents.
US3067319A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal-graphite brush with welded shunt
Assignee: Airco Inc
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Filing: 1959-11-10
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Granted: 1962-12-04
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Expires: 1979-11-10
Abstract
No abstract record available.
Inventors
- 👤 George R Zamboldi
- 👤 Herman E Hanes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:18
CPC Classifications
H; H01; H01R; H01R43/00; H01R43/12; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49119
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
220 words
THE METHOD OF ATTACHING A METAL SHUNT TO A BRUSH CONSISTING OF A BLOCK MADE OF A MIXTURE OF POWDERED METAL AND POWDERED GRAPHITE AND BEING AT LEAST 50% METAL AND HAVING A SUBSTANTIAL QUANTITY OF GRAPHITE THAT PREVENTS WELDING OF THE BRUSH TO A COMMUTATOR AS THE RESULT OF ELECTRIC ARCS BETWEEN THE BRUSH AND COMMUTATOR WHEN THE BRUSH IS IN SERVICE, WHICH METHOD COMPRISES PRESSING A METAL SHUNT AGAINST A SURFACE OF A MIXTURE OF POWDERED METAL AND GRAPHITE BY MEANS OF AN ELECTRODE AND WITH AN EVENLY DISTRIBUTED PRESSURE AND WITH SUFFICIENT PRESSURE TO OBTAIN A SUBSTANTIAL AREA OF SURFACE CONTACT BETWEEN THE SHUNT AND THE BRUSH, THE PRESSURE BEING LESS THAN THAT WHICH WILL CRUSH THE BLOCK, UNITING THE SHUNT TO PARTICLES OF POWDERED METAL, EXPOSED AT SAID AREA OF SURFACE CONTACT, BY ELECTRIC RESISTANCE WELDING PRODUCED BY A FLOW OF HIGH DENSITY CURRENT THROUGH THE SHUNT AND BRUSH WHILE THE SHUNT AND BRUSH ARE HELD TOGETHER UNDER PRESSURE, APPLYING THE CURRENT TO THE SHUNT FROM A SOURCE OF CURRENT AND OVER AN OUTER SURFACE OF THE SHUNT OPPOSITE THE SURFACE OF THE SHUNT THAT IS PRESSED AGAINST THE BRUSH AND OVER AN AREA THAT KEEPS THE CURRENT DENSITY LOW ENOUGH TO PREVENT FUSING AND WELDING OF SAID OUTER SURFACE OF THE SHUNT TO THE ELECTRODE.
Claim 2
Independent Claim
220 words
THE METHOD OF ATTACHING A METAL SHUNT TO A BRUSH CONSISTING OF A BLOCK MADE OF A MIXTURE OF POWDERED METAL AND POWDERED GRAPHITE AND BEING AT LEAST 50% METAL AND HAVING A SUBSTANTIAL QUANTITY OF GRAPHITE THAT PREVENTS WELDING OF THE BRUSH TO A COMMUTATOR AS THE RESULT OF ELECTRIC ARCS BETWEEN THE BRUSH AND COMMUTATOR WHEN THE BRUSH IS IN SERVICE, WHICH METHOD COMPRISES PRESSING A METAL SHUNT AGAINST A SURFACE OF A MIXTURE OF POWDERED METAL AND GRAPHITE BY MEANS OF AN ELECTRODE AND WITH AN EVENLY DISTRIBUTED PRESSURE AND WITH SUFFICIENT PRESSURE TO OBTAIN A SUBSTANTIAL AREA OF SURFACE CONTACT BETWEEN THE SHUNT AND THE BRUSH, THE PRESSURE BEING LESS THAN THAT WHICH WILL CRUSH THE BLOCK, UNITING THE SHUNT TO PARTICLES OF POWDERED METAL, EXPOSED AT SAID AREA OF SURFACE CONTACT, BY ELECTRIC RESISTANCE WELDING PRODUCED BY A FLOW OF HIGH DENSITY CURRENT THROUGH THE SHUNT AND BRUSH WHILE THE SHUNT AND BRUSH ARE HELD TOGETHER UNDER PRESSURE, APPLYING THE CURRENT TO THE SHUNT FROM A SOURCE OF CURRENT AND OVER AN OUTER SURFACE OF THE SHUNT OPPOSITE THE SURFACE OF THE SHUNT THAT IS PRESSED AGAINST THE BRUSH AND OVER AN AREA THAT KEEPS THE CURRENT DENSITY LOW ENOUGH TO PREVENT FUSING AND WELDING OF SAID OUTER SURFACE OF THE SHUNT TO THE ELECTRODE.
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) | 1965-12-03 | 1966-06-04 | 1966-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-03 | 1970-06-04 | 1970-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-03 | 1974-06-04 | 1974-12-04 | $7700.00 | Window Closed / Lapsed |