Apparatus for detecting broken tools
Abstract
Abstract APPARATUS FOR MONITORING THE CONDITION OF MACHINE TOOLS FOR THE PURPOSE OF DETECTING A BROKEN OR MISSING TOOL. THE APPARATUS CONSISTS OF AN ELECTRIC CURRENT CARRYING TOOL SENSING PROBE WHICH IS ROTATABLY MOUNTED ADJACENT A TOOL TO BE MONITORED. WHEN THE TOOL IS IN PROPER CONDITION, ROTATION OF THE PROBE THROUGH A PREDETERMINED ANGLE WILL RESULT IN CONTACT OF THE PROBE WITH THE TOOL. IN THE CASE OF A BROKEN OR MISSING TOOL CONDITION, SUCH AS WHEN THE TOOL HAS BEEN BROKEN OFF, NO CONTACT BETWEEN PROBE AND TOOL WILL BE OBTAINED RESULTING IN AN ELECTRIC SIGNAL INDICATIVE OF THIS TOOL CONDITION. A ROTARY SOLENOID IS EMPLOYED TO ROTATE THE TOOL SENSING PROBE, AND IN ONE FORM OF THE INVENTION A SECOND PROBE, PARALLEL TO THE FIRST PROBE, IS CONNECTED TO GROUND FOR COMPLETING THE CIRCUIT WHEN THE TOOL TO BE DETECTED IS IN PROPER CONDITION. IN ANOTHER FORM OF THE INVENTION, THE SECOND PROBE IS OMITTED AND THE DRIVE SPINDLE FOR THE TOOL IS CONNECTED TO GROUND.
Inventors
- 👤 Archibald S Mitchell
Bibliographic Details
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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) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |