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2. Jack (device) - Wikipedia

   en.wikipedia.org/wiki/Jack_(device)

   A jack is a mechanical lifting device used to apply great forces or lift heavy loads. A mechanical jack employs a screw thread for lifting heavy equipment. A hydraulic jack uses hydraulic power. [1] The most common form is a car jack, floor jack or garage jack, which lifts vehicles so that maintenance can be performed. Jacks are usually rated ...

3. Derrick - Wikipedia

   en.wikipedia.org/wiki/Derrick

   The Universal Hallen derrick, replacing the D-Frame option, is a kind of traditional topping lift. The Hallen D-Frame is a steel bracket welded on the mast in the centerline. For an observer standing a beam, the frame has a "D"-shape. The D-Frame supersedes the outriggers and provides a good controlling angle on the guys.

4. Engine crane - Wikipedia

   en.wikipedia.org/wiki/Engine_crane

   The arm of the hydraulic engine hoist raises and lowers with the use of a hydraulic jack, which is operated with a bar that pumps the hydraulic jack to raise the arm. To lower the arm, pressure is released from the hydraulic jack. [2] To support the hydraulic arm, a frame with a set of legs stabilizes the weight of the engine.

5. Hoist (device) - Wikipedia

   en.wikipedia.org/wiki/Hoist_(device)

   Hoist atop an elevator. A hoist is a device used for lifting or lowering a load by means of a drum or lift-wheel around which rope or chain wraps. It may be manually operated, electrically or pneumatically driven and may use chain, fiber or wire rope as its lifting medium.

6. Headframe - Wikipedia

   en.wikipedia.org/wiki/Headframe

   Headframe of the #1 Shaft at Oyuu Tolgoi. A steel headframe is less expensive than a concrete headframe; the tallest steel headframe measures 87 m. [4] Steel headframes are more adaptable to modifications (making any construction errors easier to remedy), and are considerably lighter, requiring less substantial foundations.

7. Jackscrew - Wikipedia

   en.wikipedia.org/wiki/Jackscrew

   A machinist's jack is a miniature screw jack used to support protruding parts of a workpiece or to balance clamping forces on that workpiece during machining operations. Aside from their size, these frequently look no different from the screw jacks used to lift buildings off their foundations.