Abstract: A magnetic building block assembly provides rotating self-aligning magnetic discs in a plurality of blocks to facilitate coupling blocks together. Each block comprises a container having a removable top wall providing an opening into an interior space. A center piece is positioned in the interior space. Each of a plurality of discs is positioned in the interior space adjacent to an exterior of the center piece and adjacent to a respective one of the planar faces to rotate freely within the interior space adjacent to the respective one of the planar faces. Each of a plurality of magnetic pole zones is arranged around each disc. Each disc is free to rotate whereby adjacently positioned blocks are magnetically coupled together by the discs. Each of a plurality of spacers extends along a respective interior edge of the container to center the discs relative to the respective one of the planar faces.

Abstract: A trailer assembly including a load deck and a detachable gooseneck. The load deck includes a rotatable shaft and latch wedge and the detachable gooseneck includes a hook. The attachment of the gooseneck to the load deck will result in the rotation of the shaft and latch wedge and engage the latch wedge and hook preventing detachment of the gooseneck and load deck. Misalignment of the gooseneck and load deck may be compensated for by a chamfer of the hook and a v-shaped groove.

Abstract: A trailer assembly including a load deck and a detachable gooseneck. The load deck includes a rotatable shaft and latch wedge and the detachable gooseneck includes a hook. The attachment of the gooseneck to the load deck will result in the rotation of the shaft and latch wedge and engage the latch wedge and hook preventing detachment of the gooseneck and load deck. Misalignment of the gooseneck and load deck may be compensated for by a chamfer of the hook and a v-shaped groove.