Fluid injector
US3979028A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 31, 1974 |
| Grant date | Sep 7, 1976 |
| Priority date | — |
| Expiry date | Oct 31, 1994 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41F31/08
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A fluid injector unit wherein fluid from a chamber is deposited through an outlet passage in the chamber and onto a surface through the action of a first piston which moves in the chamber and a second piston which reciprocates within a bore in the first piston. Self sealing valve means are carried by the second piston and operate to urge the second piston toward a closed position in which it closes the outlet passage against fluid flow. Movement of the first piston within the chamber pressurizes the fluid therein and forces the second piston away from the closed position. Sealing means, also carried by the second piston, are then operative to prevent fluid leakage between the second piston and the bore as well as to act as stop means to regulate the range of motion of the second piston away from the closed position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.