System and method of injecting insulating foam precursors into cavities in a required ratio without reliance on valves or volumetric proportioners
US12385593B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 19, 2025 |
| Grant date | Aug 12, 2025 |
| Priority date | — |
| Expiry date | May 19, 2045 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04B2001/742
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A self-contained, mobile precursor dispensing system causes foam precursors to flow from precursor vessels via hoses to a dispensing gun in a required volumetric ratio. Instead of requiring the precursors to flow through a volumetric proportioner, volumetric flow meters, or flow control valves, effective lengths of the hose are configured to cause the precursors to flow in the required volumetric ratio. The effective hose lengths can be configured by selecting hoses having different inner diameters, different physical lengths, and/or different degrees of internal roughness. A compound hose having a desired effective length can be formed by joining together a plurality of hose segments of differing physical properties. The precursor flow rates can be measured by dispensing each precursor separately under identical conditions and weighing the dispensed precursor quantities. Initial precursor volumes and gas-filled head spaces in the vessels can be proportionate to the required volumetric ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.