# US 2009/0260304 A1 · Damper and vibration damping structure using the same

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- Number: US 2009/0260304 A1
- Document ID: US20090260304A1
- Status: Published application
- Kind: A1
- Application number: 12/457,728
- Filed: 2009-06-19
- Published: 2009-10-22
- Earliest claimed: 2002-02-21
- Assignees: Oiles Corporation
- Inventors: Masami Mochimaru; Sumio Kawaguchi; Mitsuru Miyazaki; Akio Suzuki
- Web page: https://patentgrep.com/patent/US20090260304A1

## CPC

- F16F 9/103: {Devices with one or more members moving linearly to and fro in chambers, any throttling effect being immaterial, i.e. damping by viscous shear effect only (F16F9/53 takes precedence)}
- F16F 9/303: {the damper being of the telescopic type}
- E04H 9/0235: {Anti-seismic devices with hydraulic or pneumatic damping}
- F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- E04H: BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL (foundations E02D)

## Abstract

A damper includes a hollow outer elongated body; a hollow inner elongated body; a liquid viscous body or liquid viscoelastic body disposed in a gap between an inner surface of the elongated body and an outer surface of the elongated body in such a manner as to be in contact with the inner surface and the outer surface of these elongated bodies, respectively; and first and second attaching structures. Further, a controller may be provided to control an increase or decrease in the internal pressure of the liquid viscous body or the liquid viscoelastic body.

## Claims

### Claim at position 1

1-67. (canceled)

### Claim 68

A damper comprising:
at least a hollow outer elongated body and a hollow inner elongated body,
said hollow outer elongated body having a hollow portion defined by an axially extending inner surface thereof,
said hollow inner elongated body including an inserted portion which has an outer surface extending in an axial direction and is disposed in said hollow portion of said hollow outer elongated body with a gap on said outer surface thereof with respect to said axially extending inner surface of said hollow outer elongated body, and which is inserted in said hollow portion of said hollow outer elongated body so as to be relatively movable in the axial direction, and an axial end portion which integrally extends from said inserted portion in the axial direction and projects to the outside from one axial end portion of said hollow outer elongated body,
a liquid viscous body or a liquid viscoelastic body being disposed in the gap between the axially extending inner surface of said hollow outer elongated body and the outer surface of said inserted portion of said hollow inner elongated body in such a manner as to be in contact with the axially extending inner surface and the outer surface,
a first attaching structure being provided on another axial end portion of said hollow outer elongated body, and a second attaching structure being provided on the axial end portion of said hollow inner elongated body, and
a controller to control an increase or decrease of the internal pressure of the liquid viscous body or the liquid viscoelastic body due to the extension or retraction of said inserted portion of said hollow inner elongated body in the axial direction with respect to said hollow portion of said hollow outer elongated body.

### Claim 69 (depends on 68)

The damper according to claim 68, wherein said inner elongated body has a hollow portion which is defined by an axially extending inner surface thereof, and which communicates with said hollow portion of said hollow outer elongated body, and said controller has a flexible partition wall for partitioning the hollow portion of at least one of said outer and inner elongated bodies into a chamber with the liquid viscous body or the liquid viscoelastic body filled therein and an air chamber, and for increasing or decreasing the volume of said chamber by the increase or decrease of the internal pressure of the liquid viscous body or the liquid viscoelastic body.

### Claim 70 (depends on 68)

The damper according to claim 68, wherein said inner elongated body has a hollow portion which is defined by an axially extending inner surface thereof, and which communicates with said hollow portion of said hollow outer elongated body, and said controller has a compressible body such as an air bag, foam rubber, a sponge, or the like which is embedded in the liquid viscous body or the liquid viscoelastic body filled in the hollow portion of at least one of said outer and inner elongated bodies, and whose volume decreases or increases due to the increase or decrease of the internal pressure of the liquid viscous body or the liquid viscoelastic body.

### Claim 71 (depends on 68)

The damper according to claim 68, wherein said controller has an air chamber which is formed in an interior of said inner elongated body and whose volume decreases or increases due to the increase or decrease of the internal pressure of the liquid viscous body or the liquid viscoelastic body.