US3904256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Supporting pivot system for a centrifuge bowl
Assignee: Commissariat à l'Énergie Atomique et Aux Énergies Alternatives
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Filing: 1973-06-21
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Granted: 1975-09-09
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Expires: 1993-06-21
Abstract
Abstract A step-bearing pivot having a spherical lower end is secured to the centrifuge bowl and a spherical step-bearing cup formed at the bottom of a lifting-oil chamber rests on elastic damping means which essentially comprise a hollow elastic shaft surrounded by and attached to a hollow damping support of slightly conical shape, a leak-tight cylindrical-conical outer casing which forms a closed space containing the shaft-support assembly and filled with damping oil which has low variation of viscosity, an inner tube and axial deflector for ensuring laminar flow of a cooling fluid within the central portion of the hollow elastic shaft.
Inventors
- 👤 Hans Pfeifer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:32
CPC Classifications
B; B04; B04B; B04B9/00; B04B9/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
208 words
A supporting pivot system for a centrifuge bowl of the type comprising in known manner a step bearing in which the male portion or pivot is secured directly to the bottom portion of the bowl and in which the female portion rests on elastic damping means, wherein said elastic damping means essentially comprise: a hollow elastic shaft having a cylindrical shape and terminating at the top end in a lifting-oil reservoir chamber, the spherical female cup of the step bearing being formed as a recess in the bottom of said chamber, a damping support of hollow construction which surrounds the hollow shaft and is of slightly conical shape, said shaft being inserted into the lower end of said support, a casing of substantially cylindrical shape which is secured to the base of the support and to the top end of the elastic shaft so as to enclose the shaft-support assembly in leak-tight manner and to form on the one hand between said shaft and said support and on the other hand between said support and said casing a closed space filled with damping oil having low variation of viscosity, means provided in the hollow central portion of the elastic shaft for ensuring laminar flow of a cooling fluid.
Claim 2
Dependent Claim
208 words
A supporting pivot system for a centrifuge bowl of the type comprising in known manner a step bearing in which the male portion or pivot is secured directly to the bottom portion of the bowl and in which the female portion rests on elastic damping means, wherein said elastic damping means essentially comprise: a hollow elastic shaft having a cylindrical shape and terminating at the top end in a lifting-oil reservoir chamber, the spherical female cup of the step bearing being formed as a recess in the bottom of said chamber, a damping support of hollow construction which surrounds the hollow shaft and is of slightly conical shape, said shaft being inserted into the lower end of said support, a casing of substantially cylindrical shape which is secured to the base of the support and to the top end of the elastic shaft so as to enclose the shaft-support assembly in leak-tight manner and to form on the one hand between said shaft and said support and on the other hand between said support and said casing a closed space filled with damping oil having low variation of viscosity, means provided in the hollow central portion of the elastic shaft for ensuring laminar flow of a cooling fluid.
Claim 3
Dependent Claim
68 words
A supporting pivot system according to claim 1, wherein the casing is metallic and is provided on the one hand with a number of bulges for endowing said casing with rigidity and on the other hand with a bellows element which forms an integral part of the metallic wall of the casing and is located substantially aT the level of the nodal point of the hollow elastic shaft.
Claim 4
Dependent Claim
52 words
A pivot system according to claim 2, wherein a system of hollow grooves in the form of loxodromes is cut in the spherical male portion of the step bearing over at least part of its height to permit use of lifting oil having substantial variation of viscosity as a function of temperature.
Claim 5
Dependent Claim
32 words
A supporting pivot system according to claim 1, wherein the damping support is fitted with a protective member in the internal top portion thereof in adjacent relation to the hollow elastic shaft.
Claim 6
Dependent Claim
54 words
A pivot system according to claim 1, wherein a system of hollow grooves in the form of loxodromes is cut in the spherical male portion of the step bearing over at least part of its height, the lifting-oil being such as to have a substantial variation of viscosity as a function of the temperature.
Claim 7
Dependent Claim
55 words
A supporting pivot system according to claim 1, wherein the top hemispherical wall of the lifting-oil chamber forms the first component of a Holweck pump in which the second component is constituted by a hemispherical flared portion which forms part of the lower end of the centrifuge bowl and is placed over said first component.
Claim 8
Dependent Claim
32 words
A supporting pivot system according to claim 6, wherein the lifting-oil reservoir chamber is provided with a predetermined number of radial pins for preventing displacement of the oil in rotational flow motion.
Claim 9
Dependent Claim
29 words
A supporting pivot system according to claim 1, wherein the spherical female cup of the step bearing is surmounted by a cylindrical portion which is coaxial with the pivot.
Claim 10
Dependent Claim
41 words
A supporting pivot system according to claim 1, wherein the male portion of the step bearing is constituted by a spherical portion joined to a conical portion surmounted by a cylindrical ridge for preventing the upward progression of the oil film.
Claim 11
Dependent Claim
34 words
A pivot system according to claim 1, wherein the centrifuge bowl is driven by a hysteresis motor carried by a member which is fixed on the damping support with inter-position of a heat insulator.
References Cited (Backward Citations)
FR1577754A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |