Mixing system for expanding foam and apparatus for applying same

Abstract

Abstract A spray gun, for mixing expanded plastic foam using compressed air and discharging the foam-air mixture, has a gun body with a mixing chamber, inlet means for connection to a supply of expanded plastic foam, inlet means for connection to a compressed air supply and a mixture discharge line. The gun has valves mounted in the body controlling supply of the expanded plastic foam to the mixing chamber. A third inlet is provided for connection to a control line, for the pump or the like, and this control line contains air under pressure which, when released, interrupts operation of the foam supplying means. Another valve in the gun body is operable to release the air under pressure from the control line. The body carries an operating handle which is geared to operating members for the valves controlling the supply of plastic foam, so that the valves are operated conjointly, and further gearing interconnects these valves with the valve controlling release of air under pressure from the control line. Thereby, when the supply line to the gun is closed down, air is discharged from the control line responsive to movement of the operating member in a valve closing direction, and the release of air from the control line interrupts operation of the pump or the like. Preferably, the gearing interconnecting the several valves and the operating handle is provided so that the gearing and the control handle may be removed as a unit from the gun body for pre-adjustment of the several valves.

Inventors

• 👤 D Reimold

Bibliographic Details