Kinematic model: four-joint link (KI 130)

Kinematic model: four-joint link (KI 130)

conversion of rotary motion into oscillating motion



  • The four-joint link is a four-bar pivot gear.
  • It converts rotary motion into oscillating motion.
  • The KI 130unit can be used to investigate the crank-rocker mechanism, the double rocker mechanism and the double crank.
  • The experimental unit comprises the drive disk with the crank and coupling and the output disk with the rocker.
  • The elements are connected to each other via pivot joints.
  • The positions of the pivot joints can be varied to adjust the crank radius, oscillation radius and coupling length.
  • The drive disk can be driven by the crank.
  • The input angle is adjusted using the drive disk, and an angle scale is integrated into the base plate.
  • The output angle is read at the angle scale on the output disk.
  • The elements are mounted on a base plate.
  • Two handles make it easy to carry and stack the unit.

Technical Details:


  • investigation of a four-joint link
  • adjustment of the crank radius at three positions of the crank on the drive disk
  • adjustment of the oscillation radius at three positions
  • adjustment of the coupling length at five positions
  • adjustment of the input angle by turning the drive disk
  • measure the output angle on the angle scale of the output disk

Technical Data:

  • Drive disk and output disk:
    • anodised aluminium
    • ball-bearing mounted
  • Crank radius:
    • 25mm, 37,5mm, 50mm
  • Rocker:
    • aluminium, anodised black
    • oscillation radius: 50mm, 100mm, 200mm
  • Coupling:
    • aluminium, anodised black
    • length: 60mm, 160mm, 180mm, 200mm, 220mm

Dimensions & Weight:

  • L x W x H: 380x280x100mm
  • Weight: approx. 3kg

Learning Objections/Experiments:

  • investigation of the mechanical relationships on the four-joint link
  • investigation of the principle of the crank-rocker mechanism, double rocker mechanism and double crank
  • verification of the Grashof condition by varying the crank radius, oscillation radius and coupling length

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.