Foam pump system for firefighting apparatus
US6009953A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 25, 1997 |
| Grant date | Jan 4, 2000 |
| Priority date | — |
| Expiry date | Feb 25, 2017 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA62C5/02
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A foam pump system for injecting chemical foamant into a firefighting stream includes a water pump, a foam pump, and an optional air compressor which are all connected to a common transmission. The transmission includes an input shaft which may be connected to a single power source (such as an engine of a fire truck) for driving the water pump, foam pump, and air compressor. The water pump, foam pump, and air compressor are preferably mounted (directly or indirectly) on the transmission to provide a compact unit that may be sold in modular form for ready incorporation into a firefighting apparatus such as a fire truck. The system also advantageously includes a hydrostatic transmission for selectively and accurately driving and controlling the speed of the foam pump and the resultant proportion of chemical foamant that is injected into the fire fighting stream. The hydrostatic transmission preferably includes a hydraulic motor for driving the foam pump and a variable displacement hydraulic pump for driving the hydraulic motor. By varying the displacement of the hydraulic pump, the speed of the foam pump can be selectively and accurately controlled. The displacement of the hydraulic …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.