# US 5,702,087 A · Aseismic support structure

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- Number: US 5,702,087 A
- Document ID: US5702087A
- Status: Granted
- Kind: A
- Application number: 08/570,789
- Filed: 1995-12-12
- Granted: 1997-12-30
- Earliest claimed: 1995-03-02
- Assignees: International Business Machines Corporation
- Inventors: Takeshi Tsukamoto; Hiroshi Suzuki; Akira Suzuki
- Web page: https://patentgrep.com/patent/US5702087A

## CPC

- F16F 15/00: Suppression of vibrations in systems ({damping of non-rotary systems using inertia effect F16F7/10; prevention or isolation of vibrations in machine tools B23Q11/0032; suppression of driveline vibrations in hybrid vehicle transmissions B60W30/20} ; vehicle seat suspension devices B60N2/50; {methods or devices for protecting against, or damping of, acoustic waves, e.g. sound G10K11/16}); Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion ({vibration absorbing or balancing means for aircraft propellers B64C11/008, for rotorcraft rotors B64C27/001} ; testing static and dynamic balance of machines or structures G01M1/00)
- F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION

## Abstract

Disclosed is an aseismic support structure having one end secured to a fixed floor and another end connected to a subject structure placed on a floating floor. The aseismic support structure includes a toggle bar, an attachment section and a mounting section. The toggle bar has a universal joint at each end and is adjustable in its length to have a predetermined length. The universal joints are rotatable around axes in the horizontal and vertical directions, respectively. The attachment section is connected to the toggle bar through one of the universal joints, and has at another end another universal joint comprising a vertical rotation section. The mounting section is connected to the attachment section through another universal joint, and secures the equipment.

## Claims

### Claim 1

An aseismic support structure having a first end secured on a fixed floor and a second end connected to a subject structure placed on a floating floor, said aseismic support structure comprising:
first means having a first universal joint at its first end and a second universal joint at its second, said first and second universal joints allowing the first means to rotate horizontally around an axis perpendicular to said fixed floor and to rotate vertically around a axis parallel to said fixed floor;
second means connected to said first universal joint by said second universal joint at one end, and having a third universal joint at another end, said second means position horizontal to said fixed floor and being constrained to said floating floor; and
mounting means connected to said second means through said third universal joint, said subject structure being secured on said mounting means.

### Claim 2 (depends on 1)

An aseismic support structure according to claim 1, wherein said first means has a spring constant of 15-30 kgf/mm.

### Claim 3 (depends on 1)

An aseismic support structure according to claim 1, wherein said first means comprises a mechanism for adjusting its length.

### Claim 4 (depends on 1)

An aseismic support structure according to claim 1, wherein said first and second universal joints comprise a horizontal rotation section freely rotatable around an axis in a direction perpendicular to said fixed floor surface and a vertical rotation section freely rotatable around an axis in one direction horizontal to said fixed floor surface.

### Claim 5 (depends on 1)

An aseismic support structure according to claim 1, wherein said second means is constrained on said floating floor through a mechanism absorbing vibration.

### Claim 6 (depends on 1)

An aseismic support structure according to claim 1, wherein said third universal joint comprises at least a vertical rotation section freely rotatable around an axis in one direction horizontal to said fixed floor surface.

### Claim 7 (depends on 1)

An aseismic support structure according to claim 1, wherein said mounting means is secured to a caster mounted on said subject structure.

### Claim 8 (depends on 1)

An aseismic support structure according to claim 1, wherein said mounting means is secured with a shaft of a caster mounted on said subject structure.

### Claim 9 (depends on 1)

An aseismic support structure according to claim 1, wherein said first universal joint is directly secured on said fixed floor.