US3718037A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paper machine tension tester
Assignee: CONS PAPER BAHAMAS Ltd
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Filing: 1970-11-23
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Granted: 1973-02-27
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Expires: 1990-11-23
Abstract
Abstract A device for measuring local tension or modulus of elasticity of web comprising a vacuum chamber into which a portion of the width of the web is drawn and the deflection of the web into the chamber measured to provide a measurement of the tension and to a pair of such devices having cavities of different widths operating together and the outputs compared to obtain a reading of the local modulus of elasticity of the web being tested.
Inventors
- 👤 D Waye
- 👤 P Stringer
- 👤 R Knight
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:57
CPC Classifications
G; G01; G01N; G01N3/00; G01N3/08; G01N3/10; G01N2203/00; G01N2203/02; G01N2203/026; G01N2203/0262; G01N2203/0278; G01N2203/0282
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
101 words
A testing device for measuring the characteristic of a web in a desired direction comprising a head, a cavity having a mouth opening in said head wherein said mouth opening is substantially oval-shaped and the long axis of said oval-shape is substantially perpendicular to the direction in which said characteristic is being tested, to have a greater sampling area along said long axis, means for drawing a vacuum in said cavity for drawing a portion of said web into said cavity and means for sensing the deflection of said web into said cavity and measuring the said characteristic of said web.
Claim 2
Dependent Claim
101 words
A testing device for measuring the characteristic of a web in a desired direction comprising a head, a cavity having a mouth opening in said head wherein said mouth opening is substantially oval-shaped and the long axis of said oval-shape is substantially perpendicular to the direction in which said characteristic is being tested, to have a greater sampling area along said long axis, means for drawing a vacuum in said cavity for drawing a portion of said web into said cavity and means for sensing the deflection of said web into said cavity and measuring the said characteristic of said web.
Claim 3
Dependent Claim
49 words
A device as defined in claim 1 wherein said means for sensing the deflection of said web adjusts said means for drawing a vacuum to maintain said deflection substantially constant and wherein said characteristic of said web is measured by measuring the degree of vacuum applied to said cavity.
Claim 4
Dependent Claim
28 words
A device as defined in claim 1 further comprising a peripheral channel surrounding said cavity, means connecting said channel to a source of vacuum to hold said web.
Claim 5
Dependent Claim
24 words
A device as defined in claim 1 wherein said long axis of said oval is at least twice the short axis of said oval.
Claim 6
Dependent Claim
44 words
A device as defined in claim 1 further comprising a pair of plates, one on each side of said cavity, orifices in said plates, means for directing jets of air through said orifices to hold said web adjacent said plates by a ''''coanda'''' effect.
Claim 7
Dependent Claim
63 words
A device as defined in claim 1 further comprising a peripheral channel surrounding said cavity, means connecting said channel to a source of vacuum to hold said web, a pair of plates one at each side of said cavity, orifices in said plates, means for directing jets of air through said orifices to hold said web adjacent said plates by a ''''coanda'''' effect.
Claim 8
Dependent Claim
121 words
A testing device for testing characteristics of a web comprising a pair of pneumatic deflecting means for pneumatically deflecting a web, said means being positioned in spaced apart relationship, means for restricting the area of said web deflected by each of said deflecting means, means for independently sensing the deflection caused by each of said deflecting means, said areas of said web being less in dimension in each direction than that of the web, said means for restricting the area of said web of each said deflecting means comprising a cavity having a mouth opening, the mouth of one of said cavities of one of said deflecting means being larger than the mouth of the cavity of the other deflecting means.
Claim 9
Dependent Claim
121 words
A testing device for testing characteristics of a web comprising a pair of pneumatic deflecting means for pneumatically deflecting a web, said means being positioned in spaced apart relationship, means for restricting the area of said web deflected by each of said deflecting means, means for independently sensing the deflection caused by each of said deflecting means, said areas of said web being less in dimension in each direction than that of the web, said means for restricting the area of said web of each said deflecting means comprising a cavity having a mouth opening, the mouth of one of said cavities of one of said deflecting means being larger than the mouth of the cavity of the other deflecting means.
Claim 10
Dependent Claim
130 words
A testing device for testing characteristics of a web comprising a head, a pair of cavities each having a mouth opening in said head, means for drawing a vacuum in said cavities for drawing a portion of said web into each of said cavities, means for positioning said web adjacent said cavities, said mouth openings of said cavities being relatively small compared with the width of said web whereby only local areas of said web are deflected into said cavities, the mouth of one of said cavities being larger than the mouth of the other of said cavities, and means for sensing the deflection of said web into each of said cavities and for comparing the deflection in each of said cavities and computing the said characteristics of said web.
Claim 11
Dependent Claim
130 words
A testing device for testing characteristics of a web comprising a head, a pair of cavities each having a mouth opening in said head, means for drawing a vacuum in said cavities for drawing a portion of said web into each of said cavities, means for positioning said web adjacent said cavities, said mouth openings of said cavities being relatively small compared with the width of said web whereby only local areas of said web are deflected into said cavities, the mouth of one of said cavities being larger than the mouth of the other of said cavities, and means for sensing the deflection of said web into each of said cavities and for comparing the deflection in each of said cavities and computing the said characteristics of said web.
Claim 12
Dependent Claim
31 words
A device as defined in claim 8 further comprising a peripheral channel surrounding said cavity, means connecting said channel to a source of vacuum to hold said web against said head.
Claim 13
Dependent Claim
14 words
A device as defined in claim 8 wherein said mouth opening is substantially oval-shaped.
Claim 14
Dependent Claim
24 words
A device as claimed in claim 10 wherein the long axis of said oval is at least twice the short axis of said oval.
Claim 15
Dependent Claim
44 words
A device as defined in claim 10 further comprising a pair of plates, one on each side of said head, orifices in said plates, means for directing jets of air through said orifices to hold said web adjacent said plates by a ''''coanda'''' effect.
Claim 16
Independent Claim
145 words
A method of measuring localized tension in a particular direction of a continuously moving web, at a particular modulus, comprising drawing a small portion of said web into a first cavity by means of a vacuum, sensing the deflection of said web into said first cavity, and indicating the tension in said web in accordance with the deflection of said web into said first cavity, drawing a second small portion of said web into a second cavity by means of vacuum in said second cavity said second cavity being of different size than said first cavity and aligned with said first cavity so that each said cavity will measure in the same location along the web, sensing the deflection of said web into said second cavity, and indicating the tension in said web in accordance with the deflection of said web into said second cavity.
Claim 17
Independent Claim
145 words
A method of measuring localized tension in a particular direction of a continuously moving web, at a particular modulus, comprising drawing a small portion of said web into a first cavity by means of a vacuum, sensing the deflection of said web into said first cavity, and indicating the tension in said web in accordance with the deflection of said web into said first cavity, drawing a second small portion of said web into a second cavity by means of vacuum in said second cavity said second cavity being of different size than said first cavity and aligned with said first cavity so that each said cavity will measure in the same location along the web, sensing the deflection of said web into said second cavity, and indicating the tension in said web in accordance with the deflection of said web into said second cavity.
Claim 18
Dependent Claim
32 words
A method as defined in claim 13 further comprising directing jets of air in each axially opposed outside edge region of said cavities to create a ''''coanda'''' effect in each said region.
Claim 19
Dependent Claim
80 words
A testing device for testing the characteristics of a web comprising a head, a cavity having a mouth opening in said head, means for drawing a vacuum in said cavity for drawing a portion of said web into said cavity, a channel adjacent said cavity, means for drawing a vacuum in said channel for drawing said web against said cavity, and means for sensing the deflection of said web into said cavity and measuring the said characteristics of said web.
Claim 20
Dependent Claim
80 words
A testing device for testing the characteristics of a web comprising a head, a cavity having a mouth opening in said head, means for drawing a vacuum in said cavity for drawing a portion of said web into said cavity, a channel adjacent said cavity, means for drawing a vacuum in said channel for drawing said web against said cavity, and means for sensing the deflection of said web into said cavity and measuring the said characteristics of said web.
Claim 21
Independent Claim
76 words
A method of measuring localized tension in a continuously moving web, at a particular modulus, comprising drawing a small portion of said web into a cavity by means of vacuum, further drawing said web about the periphery of said cavity by means of a vacuum in a peripheral channel, sensing the deflection of said web into said cavity, and indicating the tension in said web in accordance with the deflection of said web into said cavity.
Claim 22
Independent Claim
76 words
A method of measuring localized tension in a continuously moving web, at a particular modulus, comprising drawing a small portion of said web into a cavity by means of vacuum, further drawing said web about the periphery of said cavity by means of a vacuum in a peripheral channel, sensing the deflection of said web into said cavity, and indicating the tension in said web in accordance with the deflection of said web into said cavity.
References Cited (Backward Citations)
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GB1160112A
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US3496744A
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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) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |