# US 2010/0164262 A1 · Damper and vehicle seat having the damper

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- Number: US 2010/0164262 A1
- Document ID: US20100164262A1
- Status: Published application
- Kind: A1
- Application number: 12/597,212
- Filed: 2008-04-25
- Published: 2010-07-01
- Earliest claimed: 2007-04-27
- Assignees: Oiles Corporation
- Inventors: Akihiko Okimura; Naohiro Horita; Yoshiteru Igarashi
- Web page: https://patentgrep.com/patent/US20100164262A1

## CPC

- F16F 9/512: Means responsive to load action, {i.e. static load} on the damper or {dynamic} fluid pressure {changes} in the damper, {e.g. due to changes in velocity (F16F9/504, F16F9/516 take precedence; non-automatic damper adjustment from a distance using servo control, the servo pressure being created by the flow of damping fluid F16F9/465; self-pumping fluid springs in vehicle suspensions B60G17/044)}
- B60N 2/888: with arrangements for protecting against abnormal g-forces, e.g. by displacement of the head-rest
- F16F 9/14: Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect
- F16F 2232/04: Rotary-to-translation conversion
- F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- B60N: SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR

## Abstract

A damper 1 includes a vessel 2; a partitioning member 6 which partitions the interior of the vessel 2 into two accommodation chambers 4 and 5 for accommodating a viscous fluid 3, and which rotates together with the vessel 2 in an R direction and is movable in an axial direction A; a moving force imparting means 7 for imparting to the partitioning member 6 a moving force in an A1 direction by the input of rotation in an R1 direction; a resilient means 8 for resiliently urging the partitioning member 6 in an A2 direction; a through hole 9 for allowing the two accommodation chambers 4 and 5 inside the vessel 2 to communicate with each other; and an allowing/limiting member 10 which allows the viscous fluid 3 accommodated in the two accommodation chambers 4 and 5 in the vessel 2 to flow reciprocally between the two accommodation chambers 4 and 5 through the through hole 9, and which limits the flow of the viscous fluid 3 in the accommodation chamber 4 into the accommodation chamber 5 in the A2 direction through the through hole 9 when the internal pressure of the viscous fluid 3 accommodated in the accommodation chamber 4 in the A1 direction is generated in excess of a fixed value on the basis of the movement of the partitioning member 6 in the A1 direction.

## Claims

### Claim 1

A damper comprising:
a vessel;
a partitioning member which partitions an interior of said vessel into two accommodation chambers for accommodating a viscous fluid, and which rotates together with said vessel about an axis of said vessel and is movable in an axial direction of said vessel;
moving force imparting means for imparting to said partitioning member a moving force in one axial direction by the input of relative rotation about the axis of said vessel with respect to said vessel, so that a moving velocity is set to one corresponding to a rotating velocity of the input of rotation;
resilient means for resiliently urging said partitioning member in another axial direction;
a through hole formed in said partitioning member so as to allow the two accommodation chambers inside said vessel to communicate with each other; and
an allowing/limiting member which is resiliently urged in the one axial direction to allow the viscous fluid accommodated in said two accommodation chambers in said vessel to flow reciprocally between said two accommodation chambers through said through hole, and which limits the flow of the viscous fluid in said accommodation chamber in the one axial direction into said accommodation chamber in the other axial direction through said through hole against the resilient urge in the one axial direction allowing that flow, when the internal pressure of the viscous fluid accommodated in said accommodation chamber in the one axial direction is generated in excess of a fixed value on the basis of the movement of said partitioning member in the one axial direction.

### Claim 2 (depends on 1)

The damper according to claim 1, wherein said moving force imparting means includes a rotatable member disposed rotatably in said vessel; and inclined surface means having inclined surfaces which are formed between an axial one end face of said rotatable member and an axial one end face of said partitioning member opposing that one end face and which are inclined with respect to the axial direction.

### Claim 3 (depends on 2)

The damper according to claim 2, wherein said inclined surface means includes a plurality of rotatable member projections formed integrally on the one end face of said rotatable member projectingly in the one axial direction, and arranged in a direction about the axis, and a plurality of partitioning member projections formed integrally on the one end face of said partitioning member projectingly in the other axial direction, and arranged in the direction about the axis so as to mesh with the rotatable member projections, and wherein the inclined surfaces are formed on the rotatable member projections and the partitioning member projections, respectively, so as to be brought into sliding contact with each other.

### Claim 4 (depends on 1)

The damper according to claim 1, wherein said allowing/limiting member has a lid portion which is opposed to an axial one open end of said through hole at an axial other end face of said partitioning member and is disposed movably in the axial direction, and said damper has resilient means for urging said lid portion in the one axial direction.

### Claim 5 (depends on 4)

The damper according to claim 4, wherein said allowing/limiting member has at least a pair of mutually spaced-apart projections formed integrally on said lid portion projectingly in the other axial direction and fitted in said through hole movably in the axial direction.

### Claim 6 (depends on 1)

A vehicle seat comprising:
a backrest of a vehicle;
a headrest supported by said backrest movably in a forward direction of the vehicle;
movement urging means for urging said headrest to move in the forward direction;
an inhibition mechanism for inhibiting the movement of said headrest in the forward direction; and
canceling means for canceling the inhibition by said inhibition mechanism of the movement of said headrest in the forward direction when a moving velocity applied to said backrest in a backward direction of the vehicle has exceeded a fixed value,
said canceling means having a load-rotation converting mechanism for converting a load applied to a back receiving portion of said backrest into a rotational force and a transmitting mechanism for transmitting to said inhibition mechanism the force on the basis of the moving velocity applied to said backrest in the backward direction of the vehicle and exceeding the fixed value,
said transmitting mechanism having said damper according to claim 1,
wherein one of said vessel and said partitioning member of said damper is coupled to said load-rotation converting mechanism so as to receive the rotational force from said load-rotation converting mechanism as an input of rotation, and another one of said vessel and said partitioning member of said damper is coupled to said inhibition mechanism so as to transmit to said inhibition mechanism the force on the basis of the moving velocity applied to said backrest in the backward direction of the vehicle and exceeding the fixed value.

### Claim 7 (depends on 6)

The vehicle seat according to claim 6, wherein said load-rotation converting mechanism has a load receiving plate supported rotatably by a frame of said backrest and disposed in the back receiving portion of said backrest.

### Claim 8 (depends on 6)

The vehicle seat according to claim 6, wherein said headrest is supported by said backrest forwardly rotatably or translatably, said movement urging means is adapted to urge said headrest to forwardly rotate or translate, and said inhibition mechanism is adapted to inhibit the rotation or translation of said headrest in the forward direction.