Patent US4883250A successfully refreshed from Google Patents.
US4883250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vibration-proof and earthquake-immue mount system
Assignee: Kajima Corp
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Filing: 1988-03-10
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Granted: 1989-11-28
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Expires: 2008-03-10
Abstract
Abstract A vibration-proof and earthquake immune mount system connecting machinery or a structure to a foundation which may be subject to external vibrations or earthquakes. The mount system includes a number of mounts operating in conjunction with a number of dampers, and both the mounts and the dampers function regardless of the direction of the external disturbance. In the mount this ominidirectionality is achieved by using a low-friction rolling contact between a ball attached to the machinery or structure and a dished surface attached to the foundation. Damping is provided by eddy current dissipation when a conductor plate attached to the structure of machinery and free to move in two directions is placed between the poles of an electromagnet which is integral with the foundation, and activated by a controller energized when a sensor detects motion of the foundation.
Inventors
- 👤 Kenichi Yano
- 👤 Hiroshi Midorikawa
- 👤 Toshiaki Kamei
- 👤 Takeharu Shizume
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:45
CPC Classifications
F; F16; F16F; F16F15/00; F16F15/02; E; E04; E04H; E04H9/00; E04H9/02; E04H9/021; E04H9/023; E04H9/0235; F16F15/021; F16F15/03; F16F15/035; F16F2230/00; F16F2230/14; Y; Y10; Y10S; Y10S52/00; Y10S52/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
257 words
A vibration-proof and earthquake immune mount system connecting a structure to a foundation comprising a number of mounts for reducing vibrations of said structure in any direction and dampers for reducing horizontal vibrations of said structure provided between said structure and foundation, each of said mounts comprising: a spring means connected to a bottom surface of said structure; a support mounted on a lower end of said spring means; a ball means rollably abutting said support at an upper surface of said ball means; a saucer mounted on said foundation, an upper surface of said saucer being in the form of a recess which receives a lower surface of said ball means in rollable contact; and each of said dampers comprising: an electromagnet with north and south poles mounted on said foundation; a connector mounted on a bottom surface of said structure; a conductor plate connected to said connector so as to be slidable in a vertical direction, the free end of said conductor plate being interposed between the north and south poles of said electromagnet; a sensor for detecting movement of said foundation and for generating a signal when movement of said foundation exceeds a predetermined amount; and a controller for receiving said signal from said sensor and for using said signal to control the electromagnet to develop a magnetic field which interacts with said conductor plate to produce eddy currents which generate a braking effect and absorb the disturbance energy when movement of said foundation exceeds a predetermined amount; whereby horizontal vibrations may be absorbed.
Claim 2
Dependent Claim
257 words
A vibration-proof and earthquake immune mount system connecting a structure to a foundation comprising a number of mounts for reducing vibrations of said structure in any direction and dampers for reducing horizontal vibrations of said structure provided between said structure and foundation, each of said mounts comprising: a spring means connected to a bottom surface of said structure; a support mounted on a lower end of said spring means; a ball means rollably abutting said support at an upper surface of said ball means; a saucer mounted on said foundation, an upper surface of said saucer being in the form of a recess which receives a lower surface of said ball means in rollable contact; and each of said dampers comprising: an electromagnet with north and south poles mounted on said foundation; a connector mounted on a bottom surface of said structure; a conductor plate connected to said connector so as to be slidable in a vertical direction, the free end of said conductor plate being interposed between the north and south poles of said electromagnet; a sensor for detecting movement of said foundation and for generating a signal when movement of said foundation exceeds a predetermined amount; and a controller for receiving said signal from said sensor and for using said signal to control the electromagnet to develop a magnetic field which interacts with said conductor plate to produce eddy currents which generate a braking effect and absorb the disturbance energy when movement of said foundation exceeds a predetermined amount; whereby horizontal vibrations may be absorbed.
Claim 3
Dependent Claim
291 words
A vibration-proof and earthquake immune mount system connecting g a structure to a foundation comprising; a number of mounts functioning to reduce disturbances in any direction, each mount comprising: a spring means connected to a bottom surface of said structure; a support mounted on a lower end of the spring means containing a multiplicity of smaller-diameter balls; a larger-diameter ball rollably abutting the smaller-diameter balls at an upper surface of said large-diameter ball; a saucer mounted on said foundation by a protrusion on a lower surface of said saucer and with an upper surface of said saucer in the form of a recess which receives lower surface of the larger-diameter ball in rollable contact; and a dam projecting radially outward from a periphery of the recess to prevent the larger-diameter ball from rolling out of the recess in response to an earthquake; and a number of dampers counteracting disturbances in a horizontal direction, each damper comprising: an electromagnet with north and south poles mounted on the foundation; a connector mounted on a bottom surface of the structure; a conductor plate connected to the connector in a manner such that the conductor plate is slidable in a vertical direction, the free end of the conductor plate being interposed between the north and south poles of the electromagnet; a sensor for detecting movement of the foundation and for generating a signal when movement of said foundation exceeds a predetermined amount; and a controller for receiving said signal from the sensor and for using said signal to control the electromagnet to develop a magnetic field which interacts with the conductor plate to produce eddy currents which generate a braking effect and absorb the disturbance energy when movement of said foundation exceeds a predetermined amount.
Claim 4
Dependent Claim
291 words
A vibration-proof and earthquake immune mount system connecting g a structure to a foundation comprising; a number of mounts functioning to reduce disturbances in any direction, each mount comprising: a spring means connected to a bottom surface of said structure; a support mounted on a lower end of the spring means containing a multiplicity of smaller-diameter balls; a larger-diameter ball rollably abutting the smaller-diameter balls at an upper surface of said large-diameter ball; a saucer mounted on said foundation by a protrusion on a lower surface of said saucer and with an upper surface of said saucer in the form of a recess which receives lower surface of the larger-diameter ball in rollable contact; and a dam projecting radially outward from a periphery of the recess to prevent the larger-diameter ball from rolling out of the recess in response to an earthquake; and a number of dampers counteracting disturbances in a horizontal direction, each damper comprising: an electromagnet with north and south poles mounted on the foundation; a connector mounted on a bottom surface of the structure; a conductor plate connected to the connector in a manner such that the conductor plate is slidable in a vertical direction, the free end of the conductor plate being interposed between the north and south poles of the electromagnet; a sensor for detecting movement of the foundation and for generating a signal when movement of said foundation exceeds a predetermined amount; and a controller for receiving said signal from the sensor and for using said signal to control the electromagnet to develop a magnetic field which interacts with the conductor plate to produce eddy currents which generate a braking effect and absorb the disturbance energy when movement of said foundation exceeds a predetermined amount.
Claim 5
Dependent Claim
22 words
The mount system of claim 2, wherein the larger-diameter ball and the smaller-diameter balls are made of a metal such as steel.
Claim 6
Dependent Claim
13 words
The mount system of claim 2, wherein the recess is conical in shape.
Claim 7
Dependent Claim
16 words
The mount system of claim 2, wherein the recess has a shape of a circular arc.
Claim 8
Dependent Claim
12 words
The mount system of claim 2, wherein the sensor is an accelerometer.
Claim 9
Dependent Claim
12 words
The mount system of claim 2, wherein the sensor is a velocimeter.
Claim 10
Dependent Claim
12 words
The mount system of claim 2, wherein the sensor is a vectormeter.
References Cited (Backward Citations)
US2055000A
Cited
US2414506A
Cited
US3771270A
Cited
US4496130A
Cited
US4699348A
Cited
US4662133A
Cited
US4726161A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-11-27 | 1993-05-29 | 1993-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-27 | 1997-05-29 | 1997-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-27 | 2001-05-29 | 2001-11-28 | $7700.00 | Window Closed / Lapsed |