# US 2014/0150644 A1 · Piston damper

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- Number: US 2014/0150644 A1
- Document ID: US20140150644A1
- Status: Published application
- Kind: A1
- Application number: 13/881,598
- Filed: 2011-10-26
- Published: 2014-06-05
- Earliest claimed: 2010-10-26
- Assignees: Nifco Inc.
- Inventors: Akinori Harada
- Web page: https://patentgrep.com/patent/US20140150644A1

## CPC

- F16J 1/005: {obtained by assembling several pieces}
- F16C 11/04: Pivotal connections (hinges for doors, windows or wings E05D)
- F16C 25/04: self-adjusting
- F16F 9/0218: {Mono-tubular units (F16F9/0227, F16F9/0236, F16F9/0245 take precedence)}
- F16F 9/3221: {of piston rods}
- F16F 9/3235: {of cylinders (F16F9/483 takes precedence)}
- F16F 9/54: Arrangements for attachment {(grommet-type rubber mounting springs per se F16F1/3732; construction of cylinder ends F16F9/3242; attachments to vehicles B60G13/001, B60G15/00)}
- F16C 2361/53: Spring-damper, e.g. gas springs
- F16J: PISTONS {(specially adapted for dampers F16F9/32)}; CYLINDERS; SEALINGS
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION

## Abstract

A piston damper has a cylinder including an attachment portion; a piston reciprocatingly disposed inside the cylinder; and a rod including an attachment portion that is moved synchronously with the piston. Each of the attachment portions of the cylinder and the rod is adapted to connect to different one of a first member and a second member to damp a movement of the other member relative to one member among both the members. At least one of the attachment portion of the cylinder and the attachment portion of the rod is formed with a fitting hole, and the attachment portion is axially supported in a fitted state between the fitting hole and an axis relative to at least one of the first member and the second member, and includes an urging device absorbing looseness of the fitting hole relative to the axis.

## Claims

### Claim 1

A piston damper, comprising:
a cylinder including an attachment portion;
a piston reciprocatingly disposed inside the cylinder; and
a rod including an attachment portion that is moved synchronously with the piston,
wherein each of the attachment portions of the cylinder and the rod is adapted to connect to different one of a first member and a second member to damp a movement of the other member relative to one member among both the members, and
at least one of the attachment portion of the cylinder and the attachment portion of the rod is formed with a fitting hole, and the attachment portion is axially supported in a fitted state between the fitting hole and an axis relative to at least one of the first member and the second member, and includes an urging device absorbing looseness of the fitting hole relative to the axis.

### Claim 2 (depends on 1)

A piston damper according to claim 1, wherein the urging device comprises an elastic piece portion in which one portion dividing an inner circumferential face of the fitting hole is deformably formed in a hole diameter direction.

### Claim 3 (depends on 2)

A piston damper according to claim 2, wherein the elastic piece portion is deformed according to an arc-like slit having a shape substantially similar to one portion of the inner circumferential face of the fitting hole.

### Claim 4 (depends on 1)

A piston damper according claim 1, wherein the cylinder includes a cap placed on one end opening and having a through-hole inserting and passing the rod, and
the rod includes a fitting piece elastically pressing against an inner face of the through-hole immediately before the rod is pushed into the cylinder to fullest extent.

### Claim 5 (depends on 1)

A piston damper according to claim 1, the cylinder and the rod each includes different one of a concave portion and a convex portion which can be mutually fitted when the rod is pushed into the cylinder.

### Claim 6 (depends on 4)

A piston damper according to claim 4, wherein the cap includes a frame portion provided to protrude on an outer end face and edging the through-hole, and a curve-shaped concave portion is formed in a central part wherein the frame portion faces.