Overlapping type double safety hinge for use in factory wall, has lower and upper cylindrical bodies, each with pair of turnable fixation wings extended at right angles from pivot

摘要

The double safety hinge has lower and upper cylindrical bodies, each with a pair of fixation wings extending at right angles from a pivot. With the fixation wings of either cylindrical body turned to overlap and comfort with the wings of the other body, the hinge can be fitted into a groove cut on a jamb and lodged into a factory wall.