Model: UK005 Excentric Slider Mechanism (left)
The slider-crank is a basic mechanism to convert circular motion into oscillating linear motion or vice versa. The eccentric-slider is a topological cousin to the slider-crank in that it has four links, one sliding joint and three cylindrical joints. Reuleaux created seven variations of this kinematic circuit by changing the ratio of the diameter of the cylindrical joints to the lengths of the links. Reuleaux called this variation “pin expansion”. In the present model, a small brass disc is driven eccentrically about a fixed pin that, in turn, drives a larger iron disc through a combination of rotary and oscillatory sliding motions. The inside of the outer brass shell acts as the diameter of the connecting link-slider joint, and is clearly greater in size than the lengths of both the crank link and the connecting links. Thus, the connecting link-crank pin is contained within the slider pin, and the crank pin is contained within the connecting link-crank pin. Eccentrics were often used in steam engine control linkage.

This model is obviously not made at the workshop of the Polytechnic School at Karlsruhe and seems to be the Reuleaux-Voigt model E06.

Francis Moon 2005-00-00

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