US3928101A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of fabricating a rolling diaphragm seal
Assignee: Boeing North American Inc
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Filing: 1974-03-07
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Granted: 1975-12-23
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Expires: 1994-03-07
Abstract
Abstract A circular rolling diaphragm seal for retaining pressures in excess of 2500 p.s.i. while remaining flexible in a widely varying temperature environment is constructed of two or more one-piece layers of a tubular stockinet cloth material bonded to two or more layers of an ethylene-propylene terpolymer elastomer based tubular material, the multi-layered composite structure being cured and subsequently formed on a rolling diaphragm forming mandrel.
Inventors
- 👤 Jerry Tucker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:08
CPC Classifications
F; F16; F16J; F16J3/00; F16J3/06; B; B29; B29D; B29D23/00; B29D23/001; B29D99/00; B29D99/005; B29K; B29K2021/00; B29L; B29L2031/00; B29L2031/755; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1028; Y10T156/103
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
326 words
A METHOD OF FABRICATING A COMPOSITION SEAL MATERIAL FOR A FELXIBLE ROLLING DIAPHRAGM SEAL CAPABLE OF RETAINING PRESSURES UP TO 300 PSI IN A TEMPERATURE RANGE BETWEEN -40*F TO 170*F IN AN OPERATION SYSTEM SUCH AS A ROCKET ENGINE, THE COMPOSITE SEAL FABRICAION PROCESS COMPRISES THE STEPS OF: ROLLING A SHEET OF RUBBER MATERIAL IN A TUBULAR FORM ON A ROLLING MILL, AND CUTTING SAID TUBULAR FORM TO TWO OR MORE EQUAL LENGTHSS PREVIOUSLY SELECTED, CUTTING TWO OR MORE LENGTHS OF SEAMLESS TUBULAR WOVEN CLOTH TO SUBSTANTIALLY CORRESPONDING TO THE PREVIOUSLY CUT LENGTHS OF SAID RUBBER MATERIAL, SLIDING ONE OF SAID LENGTHS OF SAID TUBULAR RUBBER MATERIAL OVER A THIN-WALLED FLEXIBLE TUBE BLADDER, ALTERNATELY SLIDING A LENGTH OF SAID TUBULAR CLOTH FOLLOWED BY A LENGTH OF SAID RUBBER MATERIAL OVER THE TUBE BLADDER, BUILDING UP A COMPOSITE MATERIAL TO A DESIRED THICKNESS SLIDING SAID TUBE BLADDER WITH SAID ALTERNATE LAYERS OF SAID COMPOSITE MATERIAL THEREON INTO A HEAVY-WALLED PRESSURE IZABLE CYLINDER, PRESSURIZING THE INTERIOR OF SAID FLEXIBLE TUBE BLADDER TO COMPRESS SAID ALTERNATE LAYERS OF MATERIAL BETWEEN THE OUTSIDE WALL OF SAID FLEXIBLE BLADDER AND THE INSIDE WALL OF SAID HEAVY-WALLED CYLINDER, EVACUATING THE SPACE BETWEEN SAID OUTSIDE WALL OF SAID FLEXIBLE BLADDER AND THE INSIDE WALL OF SAID HEAVY-WALLED CYLINDER BY VACUUM PUMP MEANS TO FURTHER COMPRESS SAID ALTERNATE LAYERS OF MATERIAL ON SAID BLADDER TO A UNIFORM THICKNESS, HEAING SAID PRESSURIZED CYLINDER CONTANING SAID BLADDER AND SAID ALTERNATE LAYERS OF COMPOSITE MATERIAL IN A HEATED OVEN FOR APPROXIMATELY 240 MINUTES AT TEMPERATURES RANGING FROM 250*F TO 370*F TO FUSE AND CURE SAID LAYERS OF MATERIAL INTO SAID FLEXIBLE COMPOSTE SEAL MATE RIAL ON THE BLADDER, AND REMOVING SAID CURED COMPOSITE SEAL MATERIAL FROM SAID TUBE BLADDER, AND BONDING AT LEAST A PAIR OF SEAL ATTACHMENT RINGS TO SAID COMPOSITE SEAL MATERIAL TO FACILITATE MOUNTING IN PLACE, THE FLEXIBLE COMPOSITE SEAL MATERIAL SO PREPARED FOR RETAINING SAID PRESSURE AND SAID TEMPERATURES IN SAID OPERATING SYSTEM,
Claim 2
Independent Claim
326 words
A METHOD OF FABRICATING A COMPOSITION SEAL MATERIAL FOR A FELXIBLE ROLLING DIAPHRAGM SEAL CAPABLE OF RETAINING PRESSURES UP TO 300 PSI IN A TEMPERATURE RANGE BETWEEN -40*F TO 170*F IN AN OPERATION SYSTEM SUCH AS A ROCKET ENGINE, THE COMPOSITE SEAL FABRICAION PROCESS COMPRISES THE STEPS OF: ROLLING A SHEET OF RUBBER MATERIAL IN A TUBULAR FORM ON A ROLLING MILL, AND CUTTING SAID TUBULAR FORM TO TWO OR MORE EQUAL LENGTHSS PREVIOUSLY SELECTED, CUTTING TWO OR MORE LENGTHS OF SEAMLESS TUBULAR WOVEN CLOTH TO SUBSTANTIALLY CORRESPONDING TO THE PREVIOUSLY CUT LENGTHS OF SAID RUBBER MATERIAL, SLIDING ONE OF SAID LENGTHS OF SAID TUBULAR RUBBER MATERIAL OVER A THIN-WALLED FLEXIBLE TUBE BLADDER, ALTERNATELY SLIDING A LENGTH OF SAID TUBULAR CLOTH FOLLOWED BY A LENGTH OF SAID RUBBER MATERIAL OVER THE TUBE BLADDER, BUILDING UP A COMPOSITE MATERIAL TO A DESIRED THICKNESS SLIDING SAID TUBE BLADDER WITH SAID ALTERNATE LAYERS OF SAID COMPOSITE MATERIAL THEREON INTO A HEAVY-WALLED PRESSURE IZABLE CYLINDER, PRESSURIZING THE INTERIOR OF SAID FLEXIBLE TUBE BLADDER TO COMPRESS SAID ALTERNATE LAYERS OF MATERIAL BETWEEN THE OUTSIDE WALL OF SAID FLEXIBLE BLADDER AND THE INSIDE WALL OF SAID HEAVY-WALLED CYLINDER, EVACUATING THE SPACE BETWEEN SAID OUTSIDE WALL OF SAID FLEXIBLE BLADDER AND THE INSIDE WALL OF SAID HEAVY-WALLED CYLINDER BY VACUUM PUMP MEANS TO FURTHER COMPRESS SAID ALTERNATE LAYERS OF MATERIAL ON SAID BLADDER TO A UNIFORM THICKNESS, HEAING SAID PRESSURIZED CYLINDER CONTANING SAID BLADDER AND SAID ALTERNATE LAYERS OF COMPOSITE MATERIAL IN A HEATED OVEN FOR APPROXIMATELY 240 MINUTES AT TEMPERATURES RANGING FROM 250*F TO 370*F TO FUSE AND CURE SAID LAYERS OF MATERIAL INTO SAID FLEXIBLE COMPOSTE SEAL MATE RIAL ON THE BLADDER, AND REMOVING SAID CURED COMPOSITE SEAL MATERIAL FROM SAID TUBE BLADDER, AND BONDING AT LEAST A PAIR OF SEAL ATTACHMENT RINGS TO SAID COMPOSITE SEAL MATERIAL TO FACILITATE MOUNTING IN PLACE, THE FLEXIBLE COMPOSITE SEAL MATERIAL SO PREPARED FOR RETAINING SAID PRESSURE AND SAID TEMPERATURES IN SAID OPERATING SYSTEM,
Claim 3
Dependent Claim
156 words
The method as set forth in claim 1 further comprising the steps of: placing one of a matching pair of inner seal attachment rings and one of a matching pair of outer seal attachment rings onto a rolling diaphragm seal forming mandrel, said mandrel forming inner and outer shoulders on separate parallel planes to support one each of said pairs of inner and outer seal attachment rings thereon, stretching said cured flexible composite seal material over said mandrel with said rings positioned on said shoulders, placing the second of said matching inner and outer seal attachment rings over said flexible composite seal material on said mandrel thereby sandwiching said composite seal material between said pairs of matching inner and outer seal attachment rings, and placing said mandrel with said flexible composite seal material and said seal attachment rings in place on said mandrel, into a furnace to fuse said seal attachment rings to said composite material.
Claim 4
Dependent Claim
84 words
The method as set forth in claim 2 wherein said seal attachment rings are sandblasted on one face of each of said rings, followed by priming with a bonding agent comprised of a 50-50 by weight mixture of an adhesion bonding primer consisting of a blend of organic polymer, filler and a non-volatile isocyanate curative and trichloethylene, a polymer membrane composition is then applied to said primed seal attachment rings, said rings subsequently being bonded to said flexible composite material stretched over said mandrel.
Claim 5
Dependent Claim
40 words
The method as set forth in claim 2 wherein said mandrel with said flexible composite material and said seal attachment rings in place on said mandrel are placed into a forced air oven for approximately 120 minutes at approximately 320*F.
Claim 6
Dependent Claim
52 words
The method as set forth in claim 1 wHerein said rubber material consists primarily of 100 units of a polymer material, 20 units of a processing oil, 10 units of a tacifier, 1 unit of stearic acid, 5 units of zinc oxide, 1 unit of sulfur and 2.25 units of curling accelerators.
Claim 7
Dependent Claim
25 words
The method as set forth in claim 1 wherein said seamless tubular woven cloth material is fabricated from a polyester fiber made from polyethylene terephthalate.
Claim 8
Dependent Claim
50 words
The method as set forth in claim 1 wherein the alternating layers making up the flexible composite seal material is comprised of three layers of tubular rubber material and three layers of tubular woven cloth material, said compressed and cured seal material having a thickness between 0.060 and 0.070 inch.
Claim 9
Dependent Claim
81 words
The method as set forth in claim 1 wherein said pressurized cylinder containing said flexible tube bladder and said composite alternating layers of material are heated in a forced air oven set at a first temperature of 250* + or - 10*F for 120 + or -15 minutes, followed by increasing the temperature in said oven to a second temperature of 370* + or - 10*F, said oven being held at said second temperature for 120 + or - 15 minutes.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |