Patent US3710084A successfully refreshed from Google Patents.
US3710084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-contact strip coil linear footage measuring apparatus and method
Assignee: Inland Steel Co
•
Filing: 1971-04-29
•
Granted: 1973-01-09
•
Expires: 1991-04-29
Abstract
Abstract Method and apparatus for very accurately determining the length of strip coils, such as hot or cold rolled steel strip, without contacting the strip.
Inventors
- 👤 E Valonis
- 👤 W Slagley
- 👤 G Seifert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:56
CPC Classifications
G; G01; G01B; G01B21/00; G01B21/02; G01B21/06; Y; Y10; Y10S; Y10S242/00; Y10S242/912
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
82 words
A method for determining the length of a strip coil during its coiling or uncoiling on a mandrel, said method comprising: (a) continuously measuring the outside radius of the coil, without mechanically contacting the strip, and generating a signal, r, proportional thereto; (b) generating a pulse, theta , each time said mandrel rotates a predetermined amount; (c) calculating each arc length, theta r, of the coil and; (d) summing all said arc lengths to thereby provide the length of the strip coil.
Claim 2
Independent Claim
82 words
A method for determining the length of a strip coil during its coiling or uncoiling on a mandrel, said method comprising: (a) continuously measuring the outside radius of the coil, without mechanically contacting the strip, and generating a signal, r, proportional thereto; (b) generating a pulse, theta , each time said mandrel rotates a predetermined amount; (c) calculating each arc length, theta r, of the coil and; (d) summing all said arc lengths to thereby provide the length of the strip coil.
Claim 3
Dependent Claim
15 words
A method according to claim 1 wherein said predetermined amount is 2 pi /10 radians.
Claim 4
Dependent Claim
22 words
A method in accordance with claim 1 wherein the sum obtained in step (d) is adjusted by a neutral axis correction factor.
Claim 5
Dependent Claim
32 words
A method in accordance with claim 1 wherein the sum obtained in step (d) is adjusted by a predetermined footage which is wound on the mandrel before the footage counting is initiated.
Claim 6
Dependent Claim
20 words
A method in accordance with claim 1 wherein the method is initiated in response to the start of mandrel rotation.
Claim 7
Dependent Claim
19 words
A method in accordance with claim 1 wherein step (c) is stopped in response to shearing of said strip.
Claim 8
Dependent Claim
83 words
Apparatus for accurately determining the length of a strip coil during its coiling or uncoiling on a mandrel, said apparatus comprising; pulser means for generating a pulse, theta , each time said mandrel rotates a predetermined amount; coil radius signal means for continuously measuring the outside radius of said coil without mechanically contacting the strip and generating a signal, r, proportional thereto; and computer means for calculating each arc length, theta r, of said coil and further for totaling all said arc lengths.
Claim 9
Dependent Claim
83 words
Apparatus for accurately determining the length of a strip coil during its coiling or uncoiling on a mandrel, said apparatus comprising; pulser means for generating a pulse, theta , each time said mandrel rotates a predetermined amount; coil radius signal means for continuously measuring the outside radius of said coil without mechanically contacting the strip and generating a signal, r, proportional thereto; and computer means for calculating each arc length, theta r, of said coil and further for totaling all said arc lengths.
Claim 10
Dependent Claim
14 words
Apparatus as defined by claim 7 wherein said pulser means generates an electrical pulse.
Claim 11
Dependent Claim
26 words
Apparatus as defined by claim 7 wherein said coil radius signal means comprise means for sensing the outside radius of said coil with low pressure air.
Claim 12
Dependent Claim
28 words
Apparatus as defined by claim 7 wherein said coil radius signal means comprise a light source and photoelectrical eye means for sensing the outside radius of said coil.
Claim 13
Dependent Claim
32 words
Apparatus as defined by claim 7 which includes starting means for initiating the operation of said pulser means and said coil radius signal means in response to the start of mandrel rotation.
Claim 14
Dependent Claim
11 words
Apparatus as defined by claim 7 including shear actuated stop means.
References Cited (Backward Citations)
US3145294A
Cited
US3172208A
Cited
US3315907A
Cited
US3411055A
Cited
US3519831A
Cited
US3406601A
Cited
US3553992A
Cited
US3564219A
Cited
US3600562A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |