US4567437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual oscillator method for detecting flaws in a moving chain
Assignee: Individual
•
Filing: 1983-06-10
•
Granted: 1986-01-28
•
Expires: 2003-06-10
Abstract
Abstract A method of detecting a flaw in a moving chain is disclosed in which two identical free-running oscillators are used, and through the inductive core of one a chain is passed. A comparator circuit monitors the oscillators' outputs so that changes in mass of the chain may be sensed.
Inventors
- 👤 Lincoln W. Hubbard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:13
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/72; G01N27/82; G01N27/02; G01N27/023
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
177 words
A method of detecting a flaw in a moving chain comprising the steps of providing two oscillators with ringing circuits having capacitive and inductive components; placing a brass core in the inductive component of the first oscillator; placing a perfect chain in the other inductive component; adjusting the oscillatory amplitude of the first oscillator to be slightly greater than the other oscillator; noting the position of the brass core; replacing the perfect chain with a faulty chain and readjusting the brass core to the same output as before; noting the new position of the brass core and adjusting the core to a position between the noted positions to establish a threshold signal for a faulty chain; removing the faulty chain; providing a comparator and feeding the output of the two oscillators to the comparator; passing a moving chain through the said other inductive component to check for flaws whereby a faulty chain will cause a different output of the two oscillators and an output of the comparator as an indicator of the presence of a faulty chain.
Claim 2
Independent Claim
177 words
A method of detecting a flaw in a moving chain comprising the steps of providing two oscillators with ringing circuits having capacitive and inductive components; placing a brass core in the inductive component of the first oscillator; placing a perfect chain in the other inductive component; adjusting the oscillatory amplitude of the first oscillator to be slightly greater than the other oscillator; noting the position of the brass core; replacing the perfect chain with a faulty chain and readjusting the brass core to the same output as before; noting the new position of the brass core and adjusting the core to a position between the noted positions to establish a threshold signal for a faulty chain; removing the faulty chain; providing a comparator and feeding the output of the two oscillators to the comparator; passing a moving chain through the said other inductive component to check for flaws whereby a faulty chain will cause a different output of the two oscillators and an output of the comparator as an indicator of the presence of a faulty chain.
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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) | 1989-01-27 | 1989-07-29 | 1990-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-27 | 1993-07-29 | 1994-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-27 | 1997-07-29 | 1998-01-28 | $7700.00 | Window Closed / Lapsed |