Kinematic model: Whitworth quick return mechanism (KI 140)

Kinematic model: Whitworth quick return mechanism (KI 140)

representation of a non-uniform reciprocating motion



  • The Whitworth mechanism is also known as the quick-return mechanism.
  • It represents a revolving crank slider and produces non-uniform stroke movement with slow forward movement and fast backward movement.
  • This mechanism is used in tools, packaging and transport machinery.
  • The KI 140unit generates non-uniform stroke movement by means of a Whitworth mechanism.
  • The experimental unit comprises the drive disk with crank and coupling, the driving rod and the cylinder.
  • The angle is adjusted using the crank disk, and an angle scale is integrated into the base plate.
  • A millimetre-precise steel ruler is attached to the cylinder to measure the stroke.
  • The elements are mounted on a base plate.
  • Two handles make it easy to carry and stack the unit.

Technical Details:


  • investigation of a revolving crank slider
  • generation and investigation of non-uniform stroke movements
  • adjustment of the crank radius at three positions of the connecting rod on the crank disk
  • adjustment of the angle by turning the crank disk
  • measuring the stroke on the cylinder

Technical Data:

  • Drive disk:
    • anodised aluminium
    • ball-bearing mounted
  • Crank radius:
    • 46mm
  • Slider radius:
    • 55mm
  • Driving rod:
    • anodised aluminium
    • length: 145mm
  • Cylinder/driving rod/frame:
    • stroke 0…100mm

Dimensions & Weight:

  • L x W x H: 360x280x70mm
  • Weight: approx. 2kg

Learning Objections/Experiments:

  • investigation of a revolving crank slider
  • influence of crank length and input angle on the output stroke
  • recording the transmission function of a revolving crank slider

Scope of Delivery:

  • 1 kinematic model
  • 1 set of instructional material



Due to the continuous development of our products, the goods supplied may vary in detail to that illustrated on this Website.