US3725778A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Testing apparatus having improved means for maintaining a constant density of magnetic flux induced in a moving strip of metal
Assignee: General Electric Co
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Filing: 1971-07-06
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Granted: 1973-04-03
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Expires: 1991-07-06
Abstract
Abstract A synchronous time delay is provided to assure substantially constant flux density in a moving strip of steel where it passes through a relatively stationary loss measurement guage in a continuous steel tester system. This synchronous delay system utilizes a rotary make-before-break switch with associated signal storage means to transfer a signal representative of the thickness of a section of the moving strip at a first position to control the flux density of the same section at a second position.
Inventors
- 👤 S Leonard
- 👤 M Dilick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:11
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
273 words
In apparatus for continuously Testing a moving strip having magnetic properties while the strip moves longitudinally through a gauge disposed along its path of movement, improved means for automatically maintaining a substantially constant flux density in the portion of the moving strip passing through said gauge, comprising: a. means adjacent said path for measuring the area of the cross section of said moving strip at a predetermined position in advance of said gauge and for producing a first signal whose magnitude is directly proportional to the measured area; b. rotary storage means comprising a plurality of means operative in sequence for sampling the magnitude of said first signal during periodic intervals, storing a signal of corresponding magnitude, and after a predetermined length of time delivering the stored signal to an output terminal; c. means for driving said storage means in synchronism with the movement of said strip so that said predetermined length of time corresponds to the time that elapses while a section of said strip moves from said predetermined position to said gauge; d. controllable magnetizing means for inducing flux in the portion of the strip located in said gauge; e. means associated with said gauge for producing a second signal representative of the flux level in the portion of said strip located therein; and f. means responsive to the difference between the magnitude of the signal at the output terminal of said storage means and the magnitude of said second signal for controlling said magnetizing means so as to adjust the flux level as necessary to maintain a substantially constant ratio of flux to area in said portion of said strip.
Claim 2
Dependent Claim
273 words
In apparatus for continuously Testing a moving strip having magnetic properties while the strip moves longitudinally through a gauge disposed along its path of movement, improved means for automatically maintaining a substantially constant flux density in the portion of the moving strip passing through said gauge, comprising: a. means adjacent said path for measuring the area of the cross section of said moving strip at a predetermined position in advance of said gauge and for producing a first signal whose magnitude is directly proportional to the measured area; b. rotary storage means comprising a plurality of means operative in sequence for sampling the magnitude of said first signal during periodic intervals, storing a signal of corresponding magnitude, and after a predetermined length of time delivering the stored signal to an output terminal; c. means for driving said storage means in synchronism with the movement of said strip so that said predetermined length of time corresponds to the time that elapses while a section of said strip moves from said predetermined position to said gauge; d. controllable magnetizing means for inducing flux in the portion of the strip located in said gauge; e. means associated with said gauge for producing a second signal representative of the flux level in the portion of said strip located therein; and f. means responsive to the difference between the magnitude of the signal at the output terminal of said storage means and the magnitude of said second signal for controlling said magnetizing means so as to adjust the flux level as necessary to maintain a substantially constant ratio of flux to area in said portion of said strip.
Claim 3
Dependent Claim
42 words
The improvement of claim 1 wherein the sequentially operative means of said rotary storage means are constructed and arranged so that successive sampling intervals overlap one another, whereby each sampling interval in turn commences before the end of the preceding sampling interval.
Claim 4
Dependent Claim
44 words
The improvement of claim 1 wherein said rotary storage means includes a make-before-break switch which is arranged to deliver the sequentially stored signals to said output terminal in an overlapping fashion, whereby the output terminal is continuously energized by a succession of stored signals.
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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |