Viscous material dispenser piston
US7913881B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 12, 2004 |
| Grant date | Mar 29, 2011 |
| Priority date | — |
| Expiry date | May 26, 2028 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16J1/06
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A piston assembly for use in a viscous material dispenser is disclosed. The assembly has a main body with an axial bore for receipt of a push rod. The body has a face including an annular recess and an endless lip surrounding the recess. A camming washer is disposed at least in part in the recess. The washer includes a perimeteral camming surface engageable with the lip. The body and washer are connected together for limited relative axial movement when the piston assembly is advanced against material in a cartridge to dispense such material. The relative movement is effective to cause the camming surface to force the lip outwardly into tight engagement with a wall of such a cartridge.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.