US3845434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tension sensing apparatus
Assignee: Control Data Corp
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Filing: 1973-10-31
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Granted: 1974-10-29
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Expires: 1993-10-31
Abstract
Abstract Apparatus for sensing the tension in a looped strip, is provided having a resilient member having a cavity. Fluid under pressure is admitted into said cavity, and apertures are disposed in said resilient member to admit fluid from said cavity into a region between the looped strip and the resilient member. The tension in the strip bears against the fluid in said region, and the resilient member is sufficiently resilient to deform in accordance with the tension on the strip. Sensor means is provided for sensing the deformation of the resilient means.
Inventors
- 👤 J Carter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:48
CPC Classifications
G; G01; G01L; G01L5/00; G01L5/04; G01L5/10; G01L5/108; G01L5/08; G11; G11B; G11B15/00; G11B15/18; G11B15/43
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
167 words
Sensing apparatus for sensing the tension of a strip, comprising, in combination: resilient means having a substantially rounded wall portion formed about an axis to form a cavity in said resilient means; fluid conduit means in fluid communication with said cavity, said strip being positioned outside of said resilient means and at least partially looped about said axis in spaced relation to said wall portion; fluid aperture means in said wall portion providing fluid communication between said cavity and the region between the looped portion of said strip and said wall portion, said wall portion being sufficiently resilient so as to deform when the force against the outside surface of said wall portion changes; and sensor means mounted to said resilient means for sensing the deformation of said wall portion, whereby upon change in tension in said strip a corresponding change occurs in the force imposed on fluid in said region by said strip to correspondingly change the force against the outside surface of said wall portion.
Claim 2
Dependent Claim
167 words
Sensing apparatus for sensing the tension of a strip, comprising, in combination: resilient means having a substantially rounded wall portion formed about an axis to form a cavity in said resilient means; fluid conduit means in fluid communication with said cavity, said strip being positioned outside of said resilient means and at least partially looped about said axis in spaced relation to said wall portion; fluid aperture means in said wall portion providing fluid communication between said cavity and the region between the looped portion of said strip and said wall portion, said wall portion being sufficiently resilient so as to deform when the force against the outside surface of said wall portion changes; and sensor means mounted to said resilient means for sensing the deformation of said wall portion, whereby upon change in tension in said strip a corresponding change occurs in the force imposed on fluid in said region by said strip to correspondingly change the force against the outside surface of said wall portion.
Claim 3
Dependent Claim
40 words
Apparatus according to claim 1, wherein said resilient means comprises a substantially cylindrical thin-walled tube, housing means fixedly supporting at least a portion of said tube, and resilient seal means closing the ends of said tube to form said cavity.
Claim 4
Dependent Claim
13 words
Apparatus according to claim 1, wherein said strip is a flexible, moving strip.
Claim 5
Dependent Claim
76 words
Apparatus according to claim 1, wherein said fluid aperture means comprises at least a first and a second row of a plurality of fluid apertures, said first and second rows each being disposed at approximately 5* toward the apex of said loop from the tangent between said looped portion of said strip and said resilient means, the fluid in said region forming a fluid bearing between said looped portion of said strip and said wall portion.
Claim 6
Dependent Claim
53 words
Apparatus according to claim 4, wherein said sensor includes coil means fixedly positioned within said resilient means, said coil means having an axis, and metal core means mounted to said wall portion and adapted to reciprocate within said coil along the axis of said coil in accordance with deformation of said wall portion.
Claim 7
Dependent Claim
41 words
Apparatus according to claim 5, wherein said coil is a linearly variable differential transformer and said core means is reciprocable within said transformer to alter an electric signal output from said transformer in accordance with thE position of said core means.
Claim 8
Dependent Claim
21 words
Apparatus according to claim 6, wherein the axis of said coil is substantially perpendicular to the axis of said resilient means.
Claim 9
Dependent Claim
53 words
Apparatus according to claim 1, wherein said sensor includes coil means fixedly positioned within said resilient means, said coil means having an axis, and metal core means mounted to said wall portion and adapted to reciprocate within said coil along the axis of said coil in accordance with deformation of said wall portion.
Claim 10
Dependent Claim
41 words
Apparatus according to claim 8, wherein said coil is a linearly variable differential transformer and said core means is reciprocable within said transformer to alter an electric signal output from said transformer in accordance with the position of said core means.
Claim 11
Dependent Claim
21 words
Apparatus according to claim 9, wherein the axis of said coil is substantially perpendicular to the axis of said resilient means.
References Cited (Backward Citations)
US3058076A
Cited
GB946342A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |