NASA NTRS · 19880000250
Door Opens Four Ways
Abstract
Concept based on poppable hinges. Hinge system allows door to swing open on any of four edges. Proposed system consists of four separable ball joints resembling "pop-it" beads, one at each corner of door. Made of molded plastic, joints cheap to make and install.
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Morrison, Andrew D.. 1988-04-01. Door Opens Four Ways. https://ntrs.nasa.gov/citations/19880000250
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