Automatic purging system

Details Automatic purging system Automatic purging system

B - Operations, Transporting

05

B

222/30.3

B05B 7/04 (2006.01) B29B 7/74 (2006.01)

Patent

CA 1107253

ABSTRACT OF THE DISCLOSURE A plural component dispensing system includes supplies which fur- nish first and second components, such as a resin and catalyst, under press- ure to a hand-held dispensing device having first and second valves, respec- tively. First and second passageways lead from the first and second valves to a mixing chamber in which the components are mixed, and from which the components are ejected. Upon mixing, the components are subject to increas- ing viscosity and hardening. A third valve controls flow of a purging medium from a supply of such a medium to the mixing chamber. A sensing device, such as a pressure sensor, senses the orientation of either/or both of the first and second valves. When the first and second valves are moved to positions to halt the flow of the two components, the sensing device generates a signal to start a first timing device. At the end of a predetermined time interval, the first timing device generates a signal which opens the third valve, per- mitting the purging medium to flow into the chamber and purge the mixed com- ponents from the chamber before they harden, The first timer also starts a second timer. At the end of a second predetermined time interval, the second timer generates a signal which closes the third valve, halting the flow of the purging medium.

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