Coating processes – Electrical product produced – Integrated circuit – printed circuit – or circuit board
Patent
1986-04-08
1987-06-23
Nase, Jeffrey V.
Coating processes
Electrical product produced
Integrated circuit, printed circuit, or circuit board
118629, 118663, 169 46, 169 59, 239691, B05B 1212, B05B 502, B05D 106
Patent
active
046752030
ABSTRACT:
A system for detecting fire in a powder spray booth having a spray gun for depositing powder onto products moving through the booth includes a switch mounted to the spray gun which is operatively connected to a control system which operates the booth and controls the supply of powder to the spray guns. A spring biases the switch toward an open, operating position in which a signal is sent to the control system to shut down the booth operation and powder supply. Under normal operating conditions, the spring force is overcome by a switch closure mechanism which comprises a fixed rod, and a movable rod mounted to the switch which is pulled toward the fixed rod to close the switch by a burnable filament extending between the rods and positioned in the path of the powder discharged from the spray gun. If a fire starts in the booth, the burnable filament is immediately destroyed and releases the movable rod so that the spring is permitted to move the switch to the open position. In turn, the switch sends a signal to the control system to shut down the supply of powder to the spray guns to extinguish the fire.
REFERENCES:
patent: 2024316 (1935-12-01), Theissing
patent: 2752095 (1956-06-01), Puster
patent: 3174496 (1965-03-01), Hoeppel
patent: 3800816 (1974-04-01), Follett
patent: 3824374 (1974-07-01), Mayher
patent: 3889756 (1975-06-01), Dunn
patent: 4193416 (1980-03-01), Slawson
patent: 4276064 (1981-06-01), Gerdes
patent: 4281790 (1981-08-01), McGinnis
patent: 4356868 (1982-11-01), Bentley et al.
Nase Jeffrey V.
Nordson Corporation
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