![]() ![]() The male component is the twistlock, which is fitted to cranes and transport bases. The hole is an oval 4.9 in (124.5 mm) on the long axis with two flat sides 2.5 in (63.5 mm) apart. The female part of the connector is the 7×7× 4 + 1⁄ 2 in (180×180×110 mm) corner casting, which forms each of the eight corners, welded to the container itself, and has no moving parts, only an oval hole in the tops of the four upper corners, and in the bottom of the four lower corners. The male part (which is more exposed and susceptible to damage) is placed on vehicles and equipment that are inspected very frequently, and will work with all standard containers.Ĭlose-up of corner casting with twist-lock in place and locked. Only when corrosion is very extensive (to the extent of being easily visible) does the twistlock become dangerous to move the crate. ![]() ![]() Even with long term exposure to the weather the container remains as simple to move as ever. ![]() Ī major advantage of this approach to attachment is that containers, which may be stored or transported without being inspected for months at a time, do not require any maintenance in order to function effectively. Tantlinger later released his patent royalty-free, which enabled the twist-lock to become an industry and international standard. The relative obscurity of this invention belies its importance to a more efficient world trade and transport, as the Tantlinger lock made handling and stacking standard containers much easier. The twistlock was developed in Spokane, Washington in the 1950s by transport engineer Keith Tantlinger. Shorter than 40‑foot containers must be joined together horizontally with twist-locks, to form a rigid combined whole of 40‑foot length, to make them stackable and be able to support and be supported by an ISO standard 40- or 45‑foot container stacked underneath or above them. Twist-locks also have to be used when stacking shorter than 40-foot containers, together with 40‑foot (12.2 m) and longer containers. The primary uses are to securely stack containers, for locking them into place on a container ship, : 4:18 semi-trailer or rail carriage, and for lifting and handling by specific container-handling equipment, like straddle carriers, reach stackers, container-handling forklifts, sidelifters, and various types of container cranes. A twistlock or twist lock, together with matching corner castings, as defined in norms including ISO 1161:1984, form a standardized (rotating) connector system, for connecting and securing intermodal, and predominantly ISO-standard international shipping containers. ![]()
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