Oil-free/oil-less air compressor with an improved seal
US7140291B2 · kind B2 · utility
7Cited by
27References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 28, 2005 |
| Grant date | Nov 28, 2006 |
| Priority date | — |
| Expiry date | Jan 28, 2025 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16J15/3236
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An oil-free/oil-less air compressor with a piston positioned for reciprocating in a bore, the piston having a first piston ring assembly made from a rigid, high temperature polymer, and a second piston ring assembly comprising a first portion that engages the bore, the first portion made from a relatively soft, self-lubricating polymer, and a second portion that biases the first portion against the bore.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.