US3917104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tank construction
Assignee: Metal Cladding Inc
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Filing: 1974-03-06
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Granted: 1975-11-04
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Expires: 1994-03-06
Abstract
Abstract An improved upstanding cylindrical tank is provided, in one aspect of the invention, with a ring-like stiffening member at its open upper end to resist flexure and deformation of the side wall structure under wind loading. The stiffening member has a cylindrical inner flange portion formed integrally with the tank wall, an annular web portion extending radially outward from an upper part of the upper flange portion, and a cylindrical outer flange portion depending from an outer part of the web portion and arranged concentrically with the inner flange portion. The stiffening member has a minimum vertical moment of inertia and is configured to have its vertical neutral axis located approximately midway between the furthermost fibers of the inner and outer flange portions. A tank is provided, in another aspect of the invention, with means for resisting an overturning moment which produces additional tensile forces in a leading portion of the wall structure and additional compressive forces in a trailing portion thereof. The resisting means are arranged near the bottom of the tank and include vertically-spaced upper and lower annular flanges extending radially outwardly from the side wall structure, and a plurality of circularly-spaced anchor bolts arranged to act on the upper flange to resist the additional tensile forces. The centroid of the polar moment of inertia of the resisting means is located equidistant from the furthermost fibers of the upper and lower flanges.
Inventors
- 👤 Vincent J Rossitto
- 👤 Robert E Baker
- 👤 James J Jarvis
- 👤 Serio James N De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:56
CPC Classifications
B; B65; B65D; B65D90/00; B65D90/02; B65D90/023; B65D90/024; B65D88/00; B65D88/02; B65D88/06; B65D88/08; B65D90/029; B65D90/12; Y; Y10; Y10S; Y10S220/00; Y10S220/901
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
285 words
An upstanding fiberglass reinforced plastic tank adapted to receive and store a fluid exposed to atmospheric pressure, said tank having a bottom resting on a support and having a cylindrical side wall structure, the head of a fluid within said tank exerting hydrostatic pressure on said side wall structure which urges said side wall structure to expand in a radial direction, wherein the improvement comprises: resisting means arranged at the lower portion of said tank and adapted to resist torsional stress in said tank lower portion produced by an external overturning moment applied to said tank, said moment causing a stress reversal in said tank lower portion by producing tensile forces in one part of said side wall structure and compressive forces in another part thereof, said resisting means including annular lower flange means extending radially outwardly from said tank and having a lower face arranged in downwardly thrusting relation to said support; annular upper flange means extending radially outwardly from said tank and arranged in vertically spaced relation to said lower flange means; and anchorage means secured to said support and arranged to slidably engage said upper flange means and adapted to exert substantial downward force thereon when said moment is applied to said tank, whereby such sliding engagement between said anchorage means and upper flange means may permit radial expansion of said side wall structure and, when said moment is applied to said tank, the tensile forces in said one tank part may be resisted by downward force exerted on said upper flange means by said anchorage means, and the compressive forces in such other tank part may be resisted by an upward force exerted by said support on said lower flange means.
Claim 2
Dependent Claim
285 words
An upstanding fiberglass reinforced plastic tank adapted to receive and store a fluid exposed to atmospheric pressure, said tank having a bottom resting on a support and having a cylindrical side wall structure, the head of a fluid within said tank exerting hydrostatic pressure on said side wall structure which urges said side wall structure to expand in a radial direction, wherein the improvement comprises: resisting means arranged at the lower portion of said tank and adapted to resist torsional stress in said tank lower portion produced by an external overturning moment applied to said tank, said moment causing a stress reversal in said tank lower portion by producing tensile forces in one part of said side wall structure and compressive forces in another part thereof, said resisting means including annular lower flange means extending radially outwardly from said tank and having a lower face arranged in downwardly thrusting relation to said support; annular upper flange means extending radially outwardly from said tank and arranged in vertically spaced relation to said lower flange means; and anchorage means secured to said support and arranged to slidably engage said upper flange means and adapted to exert substantial downward force thereon when said moment is applied to said tank, whereby such sliding engagement between said anchorage means and upper flange means may permit radial expansion of said side wall structure and, when said moment is applied to said tank, the tensile forces in said one tank part may be resisted by downward force exerted on said upper flange means by said anchorage means, and the compressive forces in such other tank part may be resisted by an upward force exerted by said support on said lower flange means.
Claim 3
Dependent Claim
143 words
The improvement as set forth in claim 1 wherein said side wall structure includes an upper cylindrical part having a first annular flange portion extending radially outwardly from a lower end thereof, and includes a lower cylindrical part having a second annular flange portion extending radially outwardly from an upper end thereof and a third annular flange portion extending radially outwardly from a lower end thereof, said lower end of said upper cylindrical part being adApted to rest on said upper end of said lower cylindrical part such that said first and second flange portions form said upper flange means, and said lower end of said lower cylindrical part being adapted to rest on an annular marginal portion of said bottom extending beneath said third flange portion such that said third flange portion and said bottom marginal portion form said lower flange means.
Claim 4
Dependent Claim
79 words
The improvement as set forth in claim 1 wherein said anchorage means comprises a contact member having a leg portion arranged to engage said support and a plate portion adapted to engage said upper flange means, and bolt means secured to said support and adapted to act against said plate portion such that, when said moment is applied to said tank, said plate portion may exert said downward force on said upper flange means to resist said tensile forces.
Claim 5
Dependent Claim
35 words
The improvement as set forth in claim 1 wherein said lower flange means further includes a cylindrical portion upstanding from an outer part thereof and arranged in spaced concentric relation to said side wall structure.
References Cited (Backward Citations)
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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) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |