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2. Orenstein & Koppel - Wikipedia

   en.wikipedia.org/wiki/Orenstein_&_Koppel

   The effect of the latter was also utilised on the toothed track and the load on the rack was relieved accordingly. The locomotives worked either on a simple flat steel rack or on Riggenbach ladder rack. [19] A cumulative number of only 6 to 9 rack steam locomotives were made by O&K in total.

3. 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.

4. Chain - Wikipedia

   en.wikipedia.org/wiki/Chain

   Ladder chain, a light wire chain used with sprockets for low torque power transmission; Long link chain; O-ring chain, a specialized type of roller chain; Roller chain, the type of chain most commonly used for transmission of mechanical power on bicycles, motorcycles, and in industrial and agricultural machinery

5. Rigid chain actuator - Wikipedia

   en.wikipedia.org/wiki/Rigid_chain_actuator

   Rigid chain actuators function as rack and pinion linear actuators that use articulated racks. Rigid chain actuators use limited-articulation chains, usually resembling a roller chain, that engage with pinions mounted on a drive shaft within a housing. The links of the actuating member, the “rigid chain”, are articulated in a manner that ...

6. Watt's linkage - Wikipedia

   en.wikipedia.org/wiki/Watt's_linkage

   Watt's linkage consists of three bars bolted together in a chain. The chain of bars consists of two end bars and a middle bar. The middle bar is bolted at each of its ends to one of the ends of each outer bar. The two outer bars are of equal length, and are longer than the middle bar. The three bars can pivot around the two bolts.

7. Ladder logic - Wikipedia

   en.wikipedia.org/wiki/Ladder_logic

   Ladder notation is best suited to control problems where only binary variables are required and where interlocking and sequencing of binary is the primary control problem. Like all parallel programming languages , the sequential order of operations may be undefined or obscure; logic race conditions are possible which may produce unexpected results.