Finger-operable pump with piston biasing post
US5850948A · kind A · utility
24Cited by
115References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 13, 1996 |
| Grant date | Dec 22, 1998 |
| Priority date | — |
| Expiry date | Sep 13, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05B11/1061
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A finger-operable pump includes a pump body, a non-return valve, and an actuating plunger. A plunger return spring biases the plunger toward an elevated, rest position. A piston is carried by the plunger and is movable relative to the plunger between a closed position sealing a discharge passage in the plunger and an open position in which fluid can flow from the pump through the plunger discharge passage and out of the pump. A piston return spring is provided between the piston and the plunger for biasing the piston toward the closed position, and the piston return spring includes a post which is resiliently bendable.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.