The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 23, 1987
Filed:
Apr. 08, 1986
Don R Scarbrough, Elyria, OH (US);
Nordson Corporation, Amherst, OH (US);
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.