US4065947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compensatory expansion bellows and its production
Assignee: Individual
•
Filing: 1976-12-03
•
Granted: 1978-01-03
•
Expires: 1996-12-03
Abstract
Abstract Large diameter expanding bellows is described for pipe systems produced by the invention from portable apparatus combining fixed and slidable rings, the former connected to an end of and the latter sealably mounted on a sleeve and a skirt slideable into sealing relationship with the former and connected to the slideable ring, pressure fluid admission means communicating with the annular space between the rings and an outlet for regulation of liquid flow therefrom; a sleeve 1 may be strengthened by a core 3 of cement and fitted with a dismountable ring 4 co-operative with a displaceable ring 6 connected to an upper skirt 8 defining a chamber in communication with a pump 15 for introducing fluid in hydroforming to lower fixed ring 4.
Inventors
- 👤 Paul Mazier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:51
CPC Classifications
B; B21; B21D; B21D26/00; B21D26/02; B21D26/033; B21D26/041; B21D15/00; B21D15/04; B21D15/10; B21D26/045
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
215 words
A device for manufacture, by the hydroforming process, of expanding bellows for pipe systems from metal collars, characterised in that it comprises, in combination, a rigid sleeve for placement inside said metal collar and forming an inner annular space therebetween, a fixed ring connected to the outer surface of one end of said sleeve, a displaceable ring mounted concentric to said sleeve and located between said fixed ring and the other end of said sleeve and arranged to slide with a sealing action thereon and contacting an edge of said metal collar, a cylindrical skirt concentric to said sleeve and connected to said displaceable ring and having a length so as to slidably contact said fixed ring with a sealing effect thereby defining a closed variable volume annular chamber, means for admitting under pressure a fluid into the variable volume annular chamber formed between said sleeve and said skirt and bounded by said rings, and means to regulate the inflow and outflow of liquid into and out of the inner annular space between the collar to be shaped and the sleeve, whereby when said fluid is admitted under pressure to said variable volume annular chamber, said displacable ring and said skirt are displaced relative to said fixed ring thereby deforming the collar into a bellows.
Claim 2
Independent Claim
215 words
A device for manufacture, by the hydroforming process, of expanding bellows for pipe systems from metal collars, characterised in that it comprises, in combination, a rigid sleeve for placement inside said metal collar and forming an inner annular space therebetween, a fixed ring connected to the outer surface of one end of said sleeve, a displaceable ring mounted concentric to said sleeve and located between said fixed ring and the other end of said sleeve and arranged to slide with a sealing action thereon and contacting an edge of said metal collar, a cylindrical skirt concentric to said sleeve and connected to said displaceable ring and having a length so as to slidably contact said fixed ring with a sealing effect thereby defining a closed variable volume annular chamber, means for admitting under pressure a fluid into the variable volume annular chamber formed between said sleeve and said skirt and bounded by said rings, and means to regulate the inflow and outflow of liquid into and out of the inner annular space between the collar to be shaped and the sleeve, whereby when said fluid is admitted under pressure to said variable volume annular chamber, said displacable ring and said skirt are displaced relative to said fixed ring thereby deforming the collar into a bellows.
Claim 3
Dependent Claim
26 words
Device according to claim 1, characterised in that said sleeve is inwardly strengthened by a core of cement directly cast in the interior of said sleeve.
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) | 1981-01-02 | 1981-07-04 | 1982-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-02 | 1985-07-04 | 1986-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-02 | 1989-07-04 | 1990-01-03 | $7700.00 | Window Closed / Lapsed |