Hot runner valve gate piston assembly
US6343925B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 14, 2000 |
| Grant date | Feb 5, 2002 |
| Priority date | — |
| Expiry date | Apr 14, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2045/277
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Improved hot runner valve gate piston apparatus and method includes structure and steps whereby the air piston cylinder wall transmits less than all of the compressive force between the backplate and the manifold. Preferably, a backup pad is disposed in contact with the manifold and the backplate, for transmitting some of these compressive forces. Preferably, the backup pad also transmits heat from the backplate to the manifold, reducing the temperature of the cylinder wall. A flex member is preferably provided adjacent to or integral with the cylinder for absorbing some of the compressive forces between the backplate and the manifold, and in order to maintain the air seal between the piston cylinder in the air channel in the hot runner backplate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.