High pressure plunger
US7213273B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 15, 2005 |
| Grant date | May 8, 2007 |
| Priority date | — |
| Expiry date | Dec 17, 2025 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE03C1/308
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A plunger includes a lever, a pipe, a rod passed through an axial hole of the pipe, a covering member, and a spring; the rod will be upwards displaced when the lever is pivoted upwards; the rod has a passage therein, and a head at an upper end for connection with an air pump; the covering member has a neck, and an outlet on a lower side; the pipe is inserted in the neck; two airtight rings are secured on an inner side of the neck; the rod is normally biased to a lowermost position by the spring; the lower end of the rod will block the outlet, and the passage will communicate with inside of the covering member when the rod is in lowermost position; when the lever is pivoted upwards, high-pressure air will escape through the outlet to push a blockage in a drain tube of a sink.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.