US Patent 10088261 Blast mitigation device

A blast mitigation device that includes a collar having a central collar aperture formed therethrough and having one or more collar venting apertures and one or more locking notches; and a blast shield having one or more levers, one or more blast shield venting apertures, and a collar receiving recess, wherein each lever is pivotable for releasable engagement with a corresponding locking notch and wherein when at least a portion of the collar is appropriately received within the collar receiving recess, each collar venting aperture is aligned with each blast shield venting aperture.