US3094646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety circuit
Assignee: Ingersoll Rand Co
•
Filing: 1959-04-20
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Granted: 1963-06-18
•
Expires: 1979-04-20
Abstract
No abstract record available.
Inventors
- 👤 Alton P Swett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:44
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/08; H02H7/093
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
225 words
SAFETY CIRCUIT FOR A SYSTEM THAT INCLUDES A PUMP AND A MOTOR TO DRIVE THE PUMP, COMPRISING A SEQUENCING SWITCH CONNECTED TO THE MOTOR FOR CONTROLLING THE FLOW OF POWER THERETO, A RELAY FOR ACTUATING THE SEQUENCING SWITCH, A MAINTAINING SWITCH CONNECTED IN SERIES WITH THE SEQUENCING SWITCH RELAY AND BEING ARRANGED TO OPEN AND CLOSE SIMULTANEOUSLY WITH THE SEQUENCING SWITCH IN RESPONSE TO SAID RELAY, A NORMALLY OPEN STARTING CIRCUIT CONNECTED IN PARALLEL WITH THE MAINTAINING SWITCH TO THE SEQUENCING SWITCH RELAY AND HAVING A MANUALLY OPERABLE SWITCH FOR CLOSING THE STARTING CIRCUIT TO ENERGIZED THE SEQUENCING SWITCH RELAY FOR STARTING THE MOTOR, A TEMPORARY RUNNING CIRCUIT CONNECTED TO AND CLOSED BY THE MAINTAINING SWITCH WHEN THE MOTOR IS STARTED AND HAVING A TIME DELAY RELAY SWITCH MEANS RESPONSIVE TO POWER FLOW TO THE MOTOR FOR OPENING SAID TEMPORARY RUNNING CIRCUIT AFTER A PREDETERMINED TIME INTERVAL AFTER THE MOTOR IS STARTED, AND AN OPERATING CIRCUIT CONNECTED IN PARALLEL WITH THE TEMPORARY RUNNING CIRCUIT TO THE MAINTAINING SWITCH AND HAVING A SENSING SWITCH ASSOCIATED WITH THE PUMP THAT OPENS AND CLOSES AT A FREQUENCY RELATIVE TO THE SPEED OF THE PUMP AND A TIME DELAY RELAY SWITCH MEANS RESPONSIVE TO THE SENSING SWITCH THAT OPENS WHEN THE PUMP FAILS TO RUN AT A REQUIRED SPEED TO DEENERGIZE THE SEQUENCING SWITCH RELAY TO STOP THE PUMP.
Claim 2
Dependent Claim
225 words
SAFETY CIRCUIT FOR A SYSTEM THAT INCLUDES A PUMP AND A MOTOR TO DRIVE THE PUMP, COMPRISING A SEQUENCING SWITCH CONNECTED TO THE MOTOR FOR CONTROLLING THE FLOW OF POWER THERETO, A RELAY FOR ACTUATING THE SEQUENCING SWITCH, A MAINTAINING SWITCH CONNECTED IN SERIES WITH THE SEQUENCING SWITCH RELAY AND BEING ARRANGED TO OPEN AND CLOSE SIMULTANEOUSLY WITH THE SEQUENCING SWITCH IN RESPONSE TO SAID RELAY, A NORMALLY OPEN STARTING CIRCUIT CONNECTED IN PARALLEL WITH THE MAINTAINING SWITCH TO THE SEQUENCING SWITCH RELAY AND HAVING A MANUALLY OPERABLE SWITCH FOR CLOSING THE STARTING CIRCUIT TO ENERGIZED THE SEQUENCING SWITCH RELAY FOR STARTING THE MOTOR, A TEMPORARY RUNNING CIRCUIT CONNECTED TO AND CLOSED BY THE MAINTAINING SWITCH WHEN THE MOTOR IS STARTED AND HAVING A TIME DELAY RELAY SWITCH MEANS RESPONSIVE TO POWER FLOW TO THE MOTOR FOR OPENING SAID TEMPORARY RUNNING CIRCUIT AFTER A PREDETERMINED TIME INTERVAL AFTER THE MOTOR IS STARTED, AND AN OPERATING CIRCUIT CONNECTED IN PARALLEL WITH THE TEMPORARY RUNNING CIRCUIT TO THE MAINTAINING SWITCH AND HAVING A SENSING SWITCH ASSOCIATED WITH THE PUMP THAT OPENS AND CLOSES AT A FREQUENCY RELATIVE TO THE SPEED OF THE PUMP AND A TIME DELAY RELAY SWITCH MEANS RESPONSIVE TO THE SENSING SWITCH THAT OPENS WHEN THE PUMP FAILS TO RUN AT A REQUIRED SPEED TO DEENERGIZE THE SEQUENCING SWITCH RELAY TO STOP THE PUMP.
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US1849847A
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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) | 1966-06-17 | 1966-12-17 | 1967-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-06-17 | 1970-12-17 | 1971-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-06-17 | 1974-12-17 | 1975-06-18 | $7700.00 | Window Closed / Lapsed |