US3582088A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealing apparatus
Assignee: NEC Corp
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Filing: 1968-07-16
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Granted: 1971-06-01
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Expires: 1988-07-16
Abstract
Abstract Sealing apparatus is provided wherein differential piston means is relied upon to distribute and apportion among each of the individual seals thereof, the external pressure applied to the high-pressure seal therein. In one embodiment of such apparatus, differential piston means may be positioned between each pair of individual seals present in the sealing apparatus and thereby acts to apply a back pressure to the high-pressure seal of the pair to thereby reduce the pressure thereon while the remaining external pressure is applied to the second seal of the pair. Thus, each seal present in sealing apparatus according to this invention shares the applied pressure load.
Inventors
- 👤 Tadayoshi Matsuzaki
- 👤 Yukihisa Fukumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:20
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/002; F16J15/006; Y; Y10; Y10S; Y10S277/00; Y10S277/904; Y10S277/927
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
77 words
Sealing apparatus comprising: a first body and a second body; a plurality of sealing means interposed between engaging surfaces of said first body and said second body, said plurality of sealing means including at least two sealing means having a volume interposed therebetween; and means including differential piston means disposed in cylinder means located in said first body for applying a pressure to said volume, said applied pressure being reduced from the pressure of the external environment.
Claim 2
Dependent Claim
77 words
Sealing apparatus comprising: a first body and a second body; a plurality of sealing means interposed between engaging surfaces of said first body and said second body, said plurality of sealing means including at least two sealing means having a volume interposed therebetween; and means including differential piston means disposed in cylinder means located in said first body for applying a pressure to said volume, said applied pressure being reduced from the pressure of the external environment.
Claim 3
Independent Claim
44 words
The apparatus of claim l, wherein said volume is filled with a pressure transmitting fluid, said pressure transmitting fluid upon the application of a reduced pressure thereto acting to transmit said reduced pressure throughout said volume and to said at least two sealing means.
Claim 4
Dependent Claim
37 words
The apparatus of claim 2, wherein said means for applying a reduced pressure to said volume inCludes a plurality of discrete piston and cylinder means spaced about said engaging surfaces between said at least two sealing means.
Claim 5
Independent Claim
33 words
The apparatus of claim l, wherein said cylinder means comprises a cylindrical opening communicating with said volume at a first end thereof and communicating with said external environment at a second end thereof.
Claim 6
Dependent Claim
58 words
The apparatus of claim 4, wherein said cylindrical opening includes an annular shoulder therein, said annular should effectively reducing the diameter of a portion of the bore of said cylindrical opening, said differential piston means including first and second diameter portions, said first portion of said differential piston means being substantially larger in diameter than said second portion.
Claim 7
Dependent Claim
36 words
The apparatus of claim 5, wherein said second portion of said differential piston means is mounted in the reduced diameter portion of said bore and includes an end face in fluid communication with said external environment.
Claim 8
Dependent Claim
35 words
The apparatus of claim 6, wherein said first portion of said differential piston means is mounted in an unreduced diameter portion of said bore and includes an end face in fluid communication with said volume.
Claim 9
Dependent Claim
44 words
The apparatus of claim 7, wherein said volume is filled with a pressure transmitting fluid, said pressure transmitting fluid upon the application of a reduced pressure thereto acting to transmit said reduced pressure throughout said volume and to said at least two sealing means.
Claim 10
Dependent Claim
26 words
The apparatus of claim 8, wherein piston rings are mounted on said differential piston to protect said pressure transmitting fluid from contamination by said external environment.
Claim 11
Dependent Claim
43 words
The apparatus of claim 8, wherein the ratio of areas of the end faces of said first and second portions of said differential piston means is determinative of the rate of pressure reduction achieved by said means for applying pressure to said volume.
Claim 12
Dependent Claim
27 words
The apparatus of claim 10, wherein coil spring means are provided in a portion of said volume as an assembling positioning means for said differential piston means.
Claim 13
Dependent Claim
29 words
The apparatus of claim 10, wherein the ratio of areas of the end faces of said first and second portions of said differential piston means is two to one.
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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |