Latching and sealing device
US4804290A · kind A · utility
100Cited by
26References
18Claims
0Family size
Assignees
Inventor
Key dates
| Filing date | Aug 22, 1986 |
| Grant date | Feb 14, 1989 |
| Priority date | — |
| Expiry date | Aug 22, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T403/7052
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A latching and sealing device suitable for use as a cover seal for a plunger or piston in a syringe or plunger pump includes a cylindrical seal member having a body portion and lip-and-latch means for both sealably engaging a surrounding surface and latching to the piston. A spring disposed in between the lip-and-latch means and the piston provide a constant sealing pressure while allowing the piston and seal member to be moved within a bore. Sealing between the lip-and-latch means and the bore is enhanced by use of a berm and notches radially aligned with the biasing spring.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.