Schraubstütze

Schraubstütze, also known as a screw jack or screw support, is a mechanical device used for lifting or supporting heavy loads. It operates on the principle of a screw thread, converting rotational motion into linear motion. A common form of the Schraubstütze consists of a threaded rod, a base or saddle to contact the load, and a handle or crank for rotation.

When the handle is turned, the threaded rod moves vertically, either extending or retracting depending on the direction of rotation. This allows for precise and gradual adjustments of the load's position. Schraubstützen are valued for their ability to hold a load in place without requiring continuous effort, unlike hydraulic jacks that may lose pressure over time. They are also generally simpler in construction and more robust.

Applications for Schraubstützen are diverse. They are frequently found in automotive repair for lifting vehicles, in construction for temporary support of structures, and in industrial settings for positioning heavy machinery. Their stability and fine adjustment capabilities make them suitable for tasks requiring meticulous placement. Different designs exist, including trapezoidal thread screw jacks for general use and ball screw jacks for higher efficiency and precision. Maintenance typically involves ensuring the screw threads are clean and lubricated to prevent wear and ensure smooth operation.