X-ray casette with a snap-action closure system

DETAILED DESCRIPTION What we claim is: 1.
An X-ray cassette comprising a substantially rigid lower rectangular tray section, having a peripheral rim, a resilient rectangular cover having a peripheral rim and a slight convex curvature in its free state relative to the rim of the lower rectangular tray section, a snap-action closure system for closing the cassette and flattening the convex curvature of the cover against the peripheral rim of the lower tray section, hinge means connecting rear portions of the resilient rectangular cover and lower rectangular tray section, a thin bar, slide means mounting the thin bar within the peripheral rim of the lower rectangular tray section remote from the hinge, projections on the outside of the front of the rim of the resilient rectangular cover and on the thin bar which are aligned with each other when the cover is closed down on the lower rectangular tray section, the projections each having tapered surfaces directed toward each other when the cover is slightly raised above the lower rectangular tray section, the projections each having substantially flat interengaging shoulder surfaces which engage each other when the rectangular cover is pressed downwardly into full engagement with the lower rectangular tray section whereby the cover is resiliently locked to the lower rectangular tray section against the resiliency of the convex curvature of the cover, a lever movably mounted on the lower rectangular tray section and connected to the thin bar whereby movement of the lever shifts the thin bar longitudinally to missalign its projections with those on the front rim of the cover whereby the flat shoulder surfaces of the projections on the thin bar are shifted out of line with those on the front rim of the cover whereby the cover is released and allowed to be opened by the resilient convex curvature away from the lower rectangular tray section.
2.
An X-ray cassette as set forth in claim 1 wherein a pad of resilient material is disposed within the rectangular cover for helping confine material in the lower rectangular tray section when the cover is closed and locked upon it