High performance foam dispensing gun
First Claim
1. A hand held dispenser for dispensing a reactive chemical foam composition, said dispenser comprising, in combination:
- a dispenser body including a handle portion and a carrier portion having a dispenser cartridge-receiving area with at least one pair of chemical component supply ports defined therein, each of said component supply ports conveying an individual chemical component under pressure from a pressurized source of the chemical component into an impingement mixing passage in which said components are mixed immediately prior to discharge, a dispenser cartridge including an elongated housing having a peripheral side wall, a front discharge end with a foam discharge opening and an opposed rear end, said impingement mixing passage extending rearwardly from said foam discharge opening within said housing to a point intermediate the front discharge end and said rear end, at least one pair of chemical side entry ports extending through said peripheral side wall in fluid communication with said impingement mixing passage, sealing means disposed between said peripheral side wall and said dispenser carrier receiving area about each said chemical side entry port, means for mounting said dispenser cartridge in sealed movable relation in said cartridge receiving area, means for moving said dispenser cartridge relative to said receiving area between a normally closed position wherein each said chemical component supply port is sealed by said sealing means against the peripheral side wall of said housing and an open position wherein each chemical side entry port is disposed in registering sealed relationship with a said chemical component supply port thereby permitting chemical components to flow into said passage under pressure for impingement mixing and discharge;
said dispenser further including means for periodically purging residues from said impingement mixing passage.
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Accused Products
Abstract
A hand held dispenser for chemical foam compositions having enhanced service life and being capable of delivering higher outputs of foam products is provided. In accordance with the invention, a dispenser cartridge is mounted in sealed movable relation to a cartridge carrier. Reliable face to face compressible seals are employed to accomplish primary porting to pressurized sources of chemical components. The dispenser cartridge does not rely on a sealed interface between a cylindrical valving rod and a dimensionally unstable TEFLON® bushing for porting which provides improved sealing performance. Multiple porting from two or more pressurized sources of chemical components is also facilitated by the sliding seal feature.
44 Citations
24 Claims
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1. A hand held dispenser for dispensing a reactive chemical foam composition, said dispenser comprising, in combination:
- a dispenser body including a handle portion and a carrier portion having a dispenser cartridge-receiving area with at least one pair of chemical component supply ports defined therein, each of said component supply ports conveying an individual chemical component under pressure from a pressurized source of the chemical component into an impingement mixing passage in which said components are mixed immediately prior to discharge, a dispenser cartridge including an elongated housing having a peripheral side wall, a front discharge end with a foam discharge opening and an opposed rear end, said impingement mixing passage extending rearwardly from said foam discharge opening within said housing to a point intermediate the front discharge end and said rear end, at least one pair of chemical side entry ports extending through said peripheral side wall in fluid communication with said impingement mixing passage, sealing means disposed between said peripheral side wall and said dispenser carrier receiving area about each said chemical side entry port, means for mounting said dispenser cartridge in sealed movable relation in said cartridge receiving area, means for moving said dispenser cartridge relative to said receiving area between a normally closed position wherein each said chemical component supply port is sealed by said sealing means against the peripheral side wall of said housing and an open position wherein each chemical side entry port is disposed in registering sealed relationship with a said chemical component supply port thereby permitting chemical components to flow into said passage under pressure for impingement mixing and discharge;
said dispenser further including means for periodically purging residues from said impingement mixing passage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
- a dispenser body including a handle portion and a carrier portion having a dispenser cartridge-receiving area with at least one pair of chemical component supply ports defined therein, each of said component supply ports conveying an individual chemical component under pressure from a pressurized source of the chemical component into an impingement mixing passage in which said components are mixed immediately prior to discharge, a dispenser cartridge including an elongated housing having a peripheral side wall, a front discharge end with a foam discharge opening and an opposed rear end, said impingement mixing passage extending rearwardly from said foam discharge opening within said housing to a point intermediate the front discharge end and said rear end, at least one pair of chemical side entry ports extending through said peripheral side wall in fluid communication with said impingement mixing passage, sealing means disposed between said peripheral side wall and said dispenser carrier receiving area about each said chemical side entry port, means for mounting said dispenser cartridge in sealed movable relation in said cartridge receiving area, means for moving said dispenser cartridge relative to said receiving area between a normally closed position wherein each said chemical component supply port is sealed by said sealing means against the peripheral side wall of said housing and an open position wherein each chemical side entry port is disposed in registering sealed relationship with a said chemical component supply port thereby permitting chemical components to flow into said passage under pressure for impingement mixing and discharge;
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24. In a foam dispenser of the type including a separable dispenser cartridge including an impingement mixing chamber wherein chemical components are introduced and mixed under pressure prior to discharge and a carrier member having a receiving area for receiving the dispenser cartridge, a valving rod movable within the impingement mixing chamber to open and close chemical component entry ports thereby permitting the chemical components to be discharged from the foam dispenser, the method for sealing the pressurized chemical components to provide a leak-free discharge arrangement, said method comprising providing a chemical component supply port for each component in the receiving area, providing a chemical component entry port for each component in the dispenser cartridge, said component entry ports being disposed in fluid communication with said impingement mixing chamber, providing an abrasion resistant, face to face sealing means intermediate the dispenser cartridge and the carrier adjacent the chemical component supply ports and chemical component entry ports and moving the dispenser housing relative to the receiving area so that the component supply ports and the chemical component entry ports are alternately disposed in registering sealed relation to each other and disposed in non-registering sealed relation against adjacent surface portions on the dispenser cartridge and the receiving area, respectively.
Specification