Leakage preventing liquid supply pump
US4681516A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 3, 1986 |
| Grant date | Jul 21, 1987 |
| Priority date | — |
| Expiry date | Nov 3, 2006 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B53/126
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A liquid supply pump adapted for coupling to a reciprocable motor, particularly for pumping liquids having thermosetting properties. The pump incorporates a double-acting piston in a pumping cylinder, driven by an elongated drive shaft which projects from the top of the pump for reciprocable motion, the pump having a lower intake valve and an upper exhaust valve, and an intermediate drive shaft seal above the pumping cylinder and a liquid and air drive shaft seal proximate the point of projection of the drive shaft from the pump, wherein said two seals are spaced apart by a distance greater than the pump stroke length, and a liquid drainage path from the intermediate seal back to the pump intake region.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.