US3722734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety relief device
Assignee: Individual
•
Filing: 1970-08-17
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Granted: 1973-03-27
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Expires: 1990-08-17
Abstract
Abstract A rupture disc and assembly is provided with a reverse acting frangible disc having a relieved burst pattern. The disc is positioned with its convex surface directed upstream and supports a diaphragm seal. When the relief pressure is reached, the disc snaps over center and assumes the configuration of a prebulged frangible disc. A burst pattern is cut or relieved in the dome of the disc to fail at a pressure less than the snap over pressure so that pressure causing snap over results in failure and bursting of the disc. To prevent premature tensile failure, a partial support member is positioned to overlay the relieved pattern. In this manner, a highly precise reverse acting structure is provided without the necessity to include in the assembly a punch such as is normally provided with a reverse acting, frangible disc device.
Inventors
- 👤 J Raidl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:53
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/02; F16K17/14; F16K17/16; F16K17/1606; Y; Y10; Y10S; Y10S137/00; Y10S137/91; Y10T; Y10T137/00; Y10T137/1624; Y10T137/1632; Y10T137/1692; Y10T137/1714; Y10T137/1729; Y10T137/1737; Y10T137/1744
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
268 words
A reverse acting safety pressure relief device comprising first and second body members each having a passage therethrough with the passage in one of said body members constituting an upstream passage and with the passage in the other body member constituting a downstream passage for the device; means retaining said first and second body members in sealed relatioNship with said passages in communication with one another; and reverse acting sealing means disposed across said passage at the junction of said first and second body members comprising a sealing diaphragm and support member therefor having arcuate diametrical cross sections in convex orientation relative to said upstream passage, said diaphragm and said support member being reversible from said convex orientation to concave orientation relative to said upstream passage in response to being subjected to a predetermined positive snap-over pressure in said upstream passage, said diaphragm being disposed on the initially convex upstream face of the support member and the initially convex face of said diaphragm being subjected to said pressure in the upstream passage, said support member having a dome portion cut through its thickness to define a predetermined pattern of structural weakness sufficient to cause said support member to rupture when said support member reverses at a pressure no greater than the snap-over pressure whereupon said diaphragm is caused to rupture thereby to effect failure of the sealing means; and partial support means contiguous to said support member and overlapping at least a portion of said pattern of predetermined structural weakness to prevent localized deformation of the structurally weakened support member when it is in the original convex orientation.
Claim 2
Dependent Claim
268 words
A reverse acting safety pressure relief device comprising first and second body members each having a passage therethrough with the passage in one of said body members constituting an upstream passage and with the passage in the other body member constituting a downstream passage for the device; means retaining said first and second body members in sealed relatioNship with said passages in communication with one another; and reverse acting sealing means disposed across said passage at the junction of said first and second body members comprising a sealing diaphragm and support member therefor having arcuate diametrical cross sections in convex orientation relative to said upstream passage, said diaphragm and said support member being reversible from said convex orientation to concave orientation relative to said upstream passage in response to being subjected to a predetermined positive snap-over pressure in said upstream passage, said diaphragm being disposed on the initially convex upstream face of the support member and the initially convex face of said diaphragm being subjected to said pressure in the upstream passage, said support member having a dome portion cut through its thickness to define a predetermined pattern of structural weakness sufficient to cause said support member to rupture when said support member reverses at a pressure no greater than the snap-over pressure whereupon said diaphragm is caused to rupture thereby to effect failure of the sealing means; and partial support means contiguous to said support member and overlapping at least a portion of said pattern of predetermined structural weakness to prevent localized deformation of the structurally weakened support member when it is in the original convex orientation.
Claim 3
Dependent Claim
28 words
The device of claim 1 wherein said pattern of predetermined structural weakness comprises an arcuate slit cut along the base portion of the dome of said support member.
Claim 4
Dependent Claim
31 words
The device of claim 1 wherein said diaphragm and support member have an annular flat flange surrounding their dome portions with said flat flanges positioned between first and second mounting rings.
Claim 5
Dependent Claim
27 words
The device of claim 1 wherein said pattern of predetermined structural weakness comprises radial slits cut through the crown portion of the dome of said support member.
Claim 6
Dependent Claim
37 words
The device of claim 4 wherein said partial support means is a disc contoured for securement to the initially convex face of the dome portion of the support member overlying the radial slits in said dome portion.
Claim 7
Dependent Claim
35 words
The device of claim 4 wherein said partial support means comprises a plurality of support tabs secured to the initially concave face of the support member with each tab overlapping one of said radial slits.
Claim 8
Dependent Claim
49 words
The device of claim 1 wherein said sealing means also comprises a second support member positioned upstream of said diaphragm and having an arcuate cross section with its concave surface supporting said diaphragm and at least one cut through its thickness to define a predetermined pattern of structural weakness.
Claim 9
Dependent Claim
31 words
The device of claim 7 wherein said second support member also bears at least one partial support member that overlaps at least a portion of its pattern of predetermined structural weakness.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |