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2. Lewis (lifting appliance) - Wikipedia

   en.wikipedia.org/wiki/Lewis_(lifting_appliance)

   Lewis (lifting appliance) A lewis (sometimes called a lewisson) is one of a category of lifting devices used by stonemasons to lift large stones into place with a crane, chain block, or winch. It is inserted into a specially prepared hole, or seating, in the top of a stone, preferably above its centre of mass. It works by applying principles of ...

3. Rigid chain actuator - Wikipedia

   en.wikipedia.org/wiki/Rigid_chain_actuator

   A rigid chain actuator, known variously as a linear chain actuator, push-pull chain actuator, electric chain actuator or column-forming chain actuator, is a specialized mechanical linear actuator used in window operating, push-pull material handling and lift applications. The actuator is a chain and pinion device that forms an articulated ...

4. Chain - Wikipedia

   en.wikipedia.org/wiki/Chain

   Chain. A common metal short-link chain. Roller chains. A chain is a serial assembly of connected pieces, called links, typically made of metal, with an overall character similar to that of a rope in that it is flexible and curved in compression but linear, rigid, and load-bearing in tension. A chain may consist of two or more links.

5. Differential pulley - Wikipedia

   en.wikipedia.org/wiki/Differential_pulley

   In lifting a load, for each full revolution of the double sprocket assembly, P1 chain link pairs (alternate perpendicular links fit between pockets) will be taken up by the larger sprocket while P2 chain link pairs are released by the smaller sprocket, for a net gain of P1-P2 chain link pairs.

6. Linkage (mechanical) - Wikipedia

   en.wikipedia.org/wiki/Linkage_(mechanical)

   Variable stroke engine (Autocar Handbook, Ninth edition) A mechanical linkage is an assembly of systems connected to manage forces and movement. The movement of a body, or link, is studied using geometry so the link is considered to be rigid. [1] The connections between links are modeled as providing ideal movement, pure rotation or sliding for ...

7. Hoist (device) - Wikipedia

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

   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. The most familiar form is an elevator, the car of which is raised and lowered by a hoist mechanism.