Elliptical trammels is an example of inversion of _____. 

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  1. quick return mechanism
  2. single slider crank chain 
  3. double slider crank chain
  4. four bar chain

Answer (Detailed Solution Below)

Option 3 : double slider crank chain
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Detailed Solution

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Explanation:

Mechanism and Inversion:

  • When one of the links of a kinematic chain is fixed, the chain is known as a mechanism.
  • A mechanism with four links is known as a simple mechanism, and a mechanism with more than four links is known as a compound mechanism.
  • We can obtain as many mechanisms as the number of links in the kinematic chain by fixing, in turn, different links in a kinematic chain.
  • This method of obtaining different mechanisms by fixing different links in a kinematic chain is known as the inversion of a mechanism.

INVERSION

Four Bar Chain Mechanism

  • Beam Engine (crank and lever mechanism)
  • Coupling rod of a locomotive (double crank mechanism)
  • Watt’s Indicator (Double lever mechanism)

Single Slider Crank Mechanism

  • First Inversion
    • Reciprocating engine or compressor.
  • Second Inversion
    • Whitworth quick return mechanism, Rotary engine etc.
  • Third Inversion
    • Slotted crank mechanism, Oscillatory engine.
  • Fourth Inversion
    • Hand pump, Pendulum pump or Bull engine.

Double Slider Crank Mechanism

  • Elliptical trammels
  • Scotch yoke mechanism
  • Oldham’s coupling

Explanation:

Elliptical trammels:

  • It is an instrument used for drawing ellipses.

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Additional Information 

Geneva mechanism:

  • The Geneva mechanism translates a continuous rotation into an intermittent rotary motion.
  • The rotating drive wheel has a pin that reaches into a slot of the driven wheel.
  • The drive wheel also has a raised circular blocking disc that locks the driven wheel in position between steps

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Scotch yoke mechanism:

  • This mechanism is used for converting rotary motion into a reciprocating motion.

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Whitworth Mechanism:

  • This mechanism is mostly used in shaping and slotting machines.

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