Piston, method of making the piston and piston and cylinder unit comprising the piston
US5174192A · kind A · utility
0Cited by
4References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 15, 1991 |
| Grant date | Dec 29, 1992 |
| Priority date | — |
| Expiry date | Oct 15, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49256
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A piston for a door closer comprises metal cups on opposite ends of a stem. A plastics ring is a snap-fit in one of the cups and protrudes from that cup to seal against the wall of a cylinder. A groove in the side wall of the cup for receiving a rib on the ring is formed by pressing a substantially flat blank before the blank is formed into the cup.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.