# US 4,395,809 A · Manufacture of vibration dampers

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 4,395,809 A
- Document ID: US4395809A
- Status: Granted
- Kind: A
- Application number: 06/226,194
- Filed: 1981-01-19
- Granted: 1983-08-02
- Earliest claimed: 1980-01-25
- Assignees: Concentric Pumps Limited
- Inventors: John L. Whiteley
- Web page: https://patentgrep.com/patent/US4395809A

## CPC

- F16F 15/1442: {with a single mass}
- F16F 15/10: Suppression of vibrations in rotating systems by making use of members moving with the system (by balancing F16F15/22 {; yielding couplings F16D3/00} ; with flywheels acting variably or intermittently F16H {; construction providing resilience or vibration-damping for gear elements F16H55/14})
- Y10T 29/49872: Confining elastic part in socket
- F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A vibration damper comprises a rigid inner member having a plain cylindrical outer surface, a rigid outer member having a plain cylindrical inner surface located in generally concentric relation with the cylindrical outer surface of the inner member, and an intermediate moulded ring of elastomeric material inserted between said cylindrical surfaces so as to be radially compressed therebetween. The elastomeric ring has outer and inner generally cylindrical surfaces contacting the inner and outer plain cylindrical surfaces of the outer and inner members respectively. At least one of the said inner and outer surfaces of the elastomeric ring is formed with a moulded textured finish with peaks and troughs such that the differential between the peaks and troughs in the textured surface is in the range of 250 to 1000 micro inches.

## Claims

### Claim 1

A method of manufacturing a vibration damper comprising the steps of producing a rigid inner member having a plain cylindrical outer surface, a rigid outer member having a plain cylindrical inner surface of a diameter greater than the diameter of the outer surface of said inner member, and an intermediate ring of elastomeric material having concentric inner and outer surfaces to fit said cylindrical surfaces of said inner and outer members, wherein the improvement comprises the steps of moulding said ring in such form that at least one of its inner and outer surfaces has ribs extending circumferentially of said ring with peaks and troughs such that the differential between the peaks and troughs is in the range of 250 to 1000 microinches, and then pressing said ring axially between said inner and outer members.

### Claim 2 (depends on 1)

A method as claimed in claim 1 in which said differential lies in the range of 400 to 600 microinches.

### Claim 3 (depends on 1)

A method as claimed in claim 1 characterised in that said ribs are of V-section.