Patent US4974378A successfully refreshed from Google Patents.
US4974378A
Expired / Lapsed
US
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Seismic-isolator
Assignee: Individual
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Filing: 1989-12-29
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Granted: 1990-12-04
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Expires: 2009-12-29
Abstract
Abstract A manufacture to isolate a structure from earthquake motion of a hazardous magnitude and at the same time to secure its stability under strongest possible wind, which comprises: (a) a number of ball transfer units rigidly coupled to a supported superstructure; (b) the same number of pedestal plates, each having a concave upper surface with an extra central depression following the shape of the ball. The force of gravity will keep the structure in its steady initial position when the balls are inset into corresponding depressions at any wind pressure and at slight earthquakes. With magnitude of earth movement exceeding a certain threshold the balls get out of central depressions, any transfer of horizontal movement to the superstructure dramatically decreases, and hazardous shaking of the earth cannot damage the structure.
Inventors
- 👤 Valentin N. Shustov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:21
CPC Classifications
E; E04; E04H; E04H9/00; E04H9/02; E04H9/021; E04H9/023; E02; E02D; E02D27/00; E02D27/32; E02D27/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
241 words
A system of seismic base isolation devices adapted to separate a superstructure from a foundation for protection against damaging effect of strong earthquakes and at the same time to prevent a separation under wind loads or minor earthquakes, each of said devices comprising: a ball transfer unit consisting of a large ball positioned in a massive steel housing, said housing located above said ball and connected rigidly to a supported superstructure, said ball separated from said housing by several smaller balls running in a hemispheric shell; a pedestal plate attached to a foundation and supporting said ball transfer unit being in rollable contact with a concave upper surface of said pedestal plate during horizontal vibration of said foundation, the geometry of said upper surface of said pedestal plate being governed by correlation of natural periods of vibration of isolated and fixedbase structures, as well as by maximum credible earthquake displacement; an additional depression in the center of said pedestal plate forming a contacting surface following the shape of said ball, the geometry of said depression at given radius of said ball being governed by interrelation between design wind load and weight of the structure in supposition that said ball remains in said depression retaining integrity of the superstructure with the foundation under wind loads or minor earthquakes, but wheels out of said depression permitting relative movement of the foundation with respect to the superstructure during earthquakes of moderate to strong magnitude.
Claim 2
Independent Claim
241 words
A system of seismic base isolation devices adapted to separate a superstructure from a foundation for protection against damaging effect of strong earthquakes and at the same time to prevent a separation under wind loads or minor earthquakes, each of said devices comprising: a ball transfer unit consisting of a large ball positioned in a massive steel housing, said housing located above said ball and connected rigidly to a supported superstructure, said ball separated from said housing by several smaller balls running in a hemispheric shell; a pedestal plate attached to a foundation and supporting said ball transfer unit being in rollable contact with a concave upper surface of said pedestal plate during horizontal vibration of said foundation, the geometry of said upper surface of said pedestal plate being governed by correlation of natural periods of vibration of isolated and fixedbase structures, as well as by maximum credible earthquake displacement; an additional depression in the center of said pedestal plate forming a contacting surface following the shape of said ball, the geometry of said depression at given radius of said ball being governed by interrelation between design wind load and weight of the structure in supposition that said ball remains in said depression retaining integrity of the superstructure with the foundation under wind loads or minor earthquakes, but wheels out of said depression permitting relative movement of the foundation with respect to the superstructure during earthquakes of moderate to strong magnitude.
References Cited (Backward Citations)
US896431A
Cited
US1651411A
Cited
US2014643A
Cited
US2208872A
Cited
US2359036A
Cited
US3425652A
Cited
SU666266A1
Cited
SU903546A1
Cited
US4496130A
Cited
US4883250A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-03 | 1994-06-04 | 1994-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-03 | 1998-06-04 | 1998-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-03 | 2002-06-04 | 2002-12-04 | $7700.00 | Window Closed / Lapsed |