US3841193A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fastening device
Assignee: Toshiba Corp
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Filing: 1972-06-02
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Granted: 1974-10-15
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Expires: 1992-06-02
Abstract
Abstract A fastening device for high pressure turbine and pump casings comprising an elongated bolt externally threaded at both ends for threaded engagement with securement nuts. Internally of the elongated bolt is a fluid passageway for conducting pressurized fluid from an external source to a chamber internal of the fastening device. In assembling the fastening device relative to turbine or pump casings, the bolt is inserted within an opening of the casings and is secured relative thereto by a first and second securement nut. Pressurized fluid is then introduced into the internal chamber of the assembly, the fluid causing the bolt to elongate. When the bolt has elongated a predetermined amount, the second securement nut is tightened to the bolt, the pressurized fluid withdrawn allowing the bolt to contract thereby securely fitting together the turbine or pump casings.
Inventors
- 👤 A Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:01
CPC Classifications
F; F16; F16B; F16B31/00; F16B31/04; F16B31/043; B; B25; B25B; B25B29/00; B25B29/02; F16B39/00; Y; Y10; Y10S; Y10S411/00; Y10S411/01; Y10S411/916
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
293 words
A fastening device comprising: an elongated cylindrical bolt having first and second portions of different diameters and having a circular flange integrally formed therewith and extending radially outward near one end of the bolt but spaced therefrom to define said second diameter portion, said bolt being capable of insertion through two components to be fastened together; first external thread means disposed upon said one end of said elongated bolt adjacent said circular flange; a first securement nut for threaded engagement with said first external thread means; an annular shoulder member having a flat edge at one end, an inner diameter substantially equal to the diameter of said circular flange and a radially inwardly extending end face at its other end which is parallel to said flat edge, said end face having a central opening of substantially the same diameter as said first diameter portion of said bolt, whereby upon insertion of the other end of said bolt therethrougH, said first securement nut may be tightened to forceably engage the one flat edged end of said shoulder member to cause the opposite and parallel end face thereof to be secured against one of the said components being fastened together; annular fluid chamber means being defined by said first diameter portion and one annular face of said circular flange of said elongated bolt and by said shoulder member; fluid passageway means located internally of said bolt at said one end thereof and connected to an external source of fluid and being in communication with said fluid chamber means for conducting fluid from said source into said fluid chamber; second external thread means disposed upon the other end of said elongated bolt; and a second securement nut for threaded engagement with said second external thread means.
Claim 2
Dependent Claim
293 words
A fastening device comprising: an elongated cylindrical bolt having first and second portions of different diameters and having a circular flange integrally formed therewith and extending radially outward near one end of the bolt but spaced therefrom to define said second diameter portion, said bolt being capable of insertion through two components to be fastened together; first external thread means disposed upon said one end of said elongated bolt adjacent said circular flange; a first securement nut for threaded engagement with said first external thread means; an annular shoulder member having a flat edge at one end, an inner diameter substantially equal to the diameter of said circular flange and a radially inwardly extending end face at its other end which is parallel to said flat edge, said end face having a central opening of substantially the same diameter as said first diameter portion of said bolt, whereby upon insertion of the other end of said bolt therethrougH, said first securement nut may be tightened to forceably engage the one flat edged end of said shoulder member to cause the opposite and parallel end face thereof to be secured against one of the said components being fastened together; annular fluid chamber means being defined by said first diameter portion and one annular face of said circular flange of said elongated bolt and by said shoulder member; fluid passageway means located internally of said bolt at said one end thereof and connected to an external source of fluid and being in communication with said fluid chamber means for conducting fluid from said source into said fluid chamber; second external thread means disposed upon the other end of said elongated bolt; and a second securement nut for threaded engagement with said second external thread means.
Claim 3
Dependent Claim
60 words
A fastening device as set forth in claim 1, wherein said bolt contains a plurality of O-rings located on the circumferences of said first and second diameter portions of said bolt in contact with said annular shoulder member, whereby the O-rings operate as static seals preventing the seepage of fluid from said fluid chamber to other parts of the device.
Claim 4
Dependent Claim
21 words
A fastening device as set forth in claim 1, further comprising a flexible, expansible bladder disposed in said fluid chamber means.
Claim 5
Dependent Claim
25 words
A fastening device as set forth in claim 3, wherein said bladder has a sleeve integrally connected thereto and surroundingly engaging said fluid passageway means.
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) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |