A twist lock and corner casting with one another type a standardised rotating connector for securing shipping and delivery containers. The main utilizes are for locking a container into area on container ship, semi-trailer truck or railway container train; and for lifting in the containers by container cranes and sidelifters.
The female element in the connector may be the 7×7×41?2 in (180×180×110 mm) corner casting fitted in the direction of container itself, and which has no shifting parts, only an oval hole all through the bottom. The hole may nicely be considered a 4.9 in (124.5 mm) diameter circle with two flat sides 2.5 in (63.5 mm) apart. The male element may be the twist lock, that is fitted to cranes and transport bases. This may nicely be inserted through the hole (it is roughly 4.1 in/104.1 mm prolonged and 2.2 in/55.9 mm wide), after which the best portion (normally pointed to produce insertion easier) is rotated 90° to make certain that it cannot be withdrawn. The mechanism may be identical as that of the Kensington lock, but on the a terrific offer bigger scale.
It was designed by transport engineer Keith W. Tantlinger from Spokane in Washington. The relative obscurity of the creation belies it worth to some additional effective world business and transport, since the Tantlinger lock designed managing and stacking basic containers a terrific offer easier.
The maximum size and position of the holes in the connector is defined in international standard ISO 1161:1984.