Blackbody radiation shield protective apparatus
An arc flash protective hood device. The protective hood is fitted with a passive blackbody radiation shield device formed with facing plates, each plate having a plurality of slots therethrough, the slots in one plate being in offset registration with the slots in the other plate, thereby creating a semi-tortuous path for fluid flow through the device. The semi-tortuous path for air flow is so formed to prevent arc-flash energy from passing through the shield device. Alternatively, the shield device may be a single, integral element, or each plate may be made in two or more segments. The blackbody radiation shield device may be mounted in an opening in a hood, and several such shield devices may be mounted in several openings in the hood.
1. A blackbody radiation shield device for use with a personal protection assembly incorporating a face shield, the device comprising:
a hood configured to cover at least the head of a wearer and incorporating the personal protection assembly, the hood and face shield being formed of materials that act as a blackbody radiation shield and protect the wearer from arc-flashes, said hood having an opening in at least one location;
a passive fluid flow blackbody radiation shield device mounted in said opening, said passive fluid flow blackbody radiation shield device having a periphery, said hood being secured to the periphery of said passive fluid flow blackbody radiation shield device,
said passive fluid flow blackbody radiation shield device comprising:
a relatively rigid first plate having a first plurality of slots therethrough; and
a relatively rigid second plate having a second plurality of slots therethrough;
said first and second plates being arranged in face-to-face relationship with said slots in said first and second plates, the slots being in offset registration so that there is no direct fluid flow route through the slots in said first and second plates, the first and second plates formed as two coplanar segments, the first plate formed with a peripheral rim thicker than a central portion of said first plate, which central portion faces said second plate, and which peripheral rim is formed with a peripheral groove, said central portion of said first plate is formed with a plurality of stand-offs which are in the plane of said peripheral rim, the path through the slots thereby providing a semi-tortuous path for fluid flow between internal and external sides of said hood;
said fluid flow blackbody radiation shield device being formed of materials that block arc-flashes, the semi-tortuous path thereby protecting the wearer from an external arc-flash while permitting fluid flow therethrough.
2. The device recited in claim 1 , wherein said first plurality of slots in said first plate differs in number from said second plurality of slots in said second plate.
3. The device recited in claim 1 , wherein said first plurality of slots in said first plate is equal in number to said second plurality of slots in said second plate.
4. The device recited in claim 1 , wherein said first plurality of slots defines a first plurality of lands therebetween, and said second plurality of slots defines a second plurality of lands therebetween.
5. The device recited in claim 1 , wherein said first plurality of slots defines a first plurality of lands therebetween, and said second plurality of slots defines a second plurality of lands therebetween and wherein said plurality of stand-offs are formed on said first plurality of lands to maintain spacing between the facing surfaces of said first and second plates.
6. The device recited in claim 1 , wherein said first plate is formed with a peripheral groove in the surface facing away from said second plate.
7. The device recited in claim 6 , wherein said passive fluid flow blackbody radiation shield device is mounted in said opening by stitches through said peripheral groove in said first plate, through said second plate, and through the hood material.