Which mechanism serves as an inversion of a single slider crank chain?

• A. Oldham's coupling
• B. Whitworth quick return mechanism
• C. Elliptical trammel
• D. Pantograph mechanism

Answer: (B)

The Whitworth quick return mechanism effectively serves as an inversion of a single slider crank chain. This mechanism consists of a crank that is connected to a ram, and its unique configuration allows for a quick return of the ram during its operation. In particular, during the forward stroke, the ram moves slower for most of its travel and quickly returns back, hence the name "quick return."

Inversions of a mechanism usually refer to the reconfiguration of linkages to produce different motion characteristics. The Whitworth mechanism is specifically designed to convert rotary motion from a crank into linear motion for the ram, illustrating this principle of inversion. In this case, the inversion of the single slider crank chain allows for a distinct time-efficient operation that is highly valued in machining processes.

The other mechanisms listed, while significant in their respective features, do not serve as an inversion of the single slider crank chain. For instance, Oldham's coupling is used primarily for coupling two shafts at an angle without misalignment issues, the elliptical trammel traces elliptical paths, and the pantograph mechanism is utilized for copying or scaling drawings and does not relate directly to the inversion of a crank mechanism. Each of these functions in a unique manner that does not align with the characteristics of the Whitworth