Thermal insulation grade foam dispensing system
US5246143A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 22, 1992 |
| Grant date | Sep 21, 1993 |
| Priority date | — |
| Expiry date | Apr 22, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29B7/7404
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A solventless, flushless hand held impingement mixing and dispensing gun for dispensing controlled quantities of a controlled thermal insulation grade reactive chemical foam composition is provided. The dispenser gun preferably includes a unitary socket member mounted to the gun body having a receptacle portion for receiving an extended service life impingement mixing and dispensing module. A converter subassembly is provided to convert variable pressure and flow rate streams of the chemical components into regulated controlled pressure metered flow rate chemical component flows for introduction to the opposed sides of the impingement mixing dispenser gun. In accordance with the invention, the controlled pressure, metered flow rate streams of components are gradually repressurized prior to entering side orifices leading to the impingement mixing chamber of the dispenser module to provide balanced pressure approach needed to consistently and reproducibly provide high quality thermal insulation grade foams of known composition and physical properties. The extended service life dispenser module includes a valving assembly employing a valving rod of hardened tool steel and scraper memb…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.