Whitworth Quick Return Mechanism is an Inversion of

Answer: B– Single slider crank chain

Whitworth quick return mechanism is an inversion of a single slider crank chain.

Solution:

Single slider crank mechanism:

• A slider-crank is a four-link kinematic chain.
• It contains three turning pairs and one sliding pair.
• The second link, which is referred to as a crank, rotates.
• The third link, often called the connecting rod, combines reciprocating and rotary motion.
• Link 4 is a slider and has reciprocating action.
• A frame is Link 1. (fixed).
• This device converts rotary motion to reciprocating motion and vice versa.

A slider-crank is a four-link kinematic chain having one sliding pair and three turning pairs.

The crank (Link 2)  has rotary motion only. The connecting rod (Link 3) has a combined rotary and reciprocating motion. The slider (Link 4) has reciprocating motion only. Slider crank  mechanism converts rotary motion to reciprocating and vice versa.

Inversions:

• First inversion: Inversion is obtained by fixing link 1(Ground body).
  Application: Reciprocating compressors and engines.
• Second inversion: Inversion is obtained by fixing link 2 (crank).
  Application: Rotary engine, Whitworth quick return mechanism.
• Third inversion: Inversion is obtained by fixing link 3 (Connecting rod).
  Application: Slotted crank mechanism, Oscillatory engine.
• Fourth inversion:  Inversion obtained by fixing link 4 (Slider).
  Application: Pendulum pump or Bull engine, A hand pump.

Whitworths quick return mechanism is an inversion of a single slider crank chain in which link 2 (crank) is fixed.

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