SLIDER-CRANK MECHANISM WITH EQUAL CRANK AND CONNECTING-ROD LENGTHS AND WITH A STOP

The lengths of the links comply with the condition: A͞B=B͞C=B͞D. Point D travels along straight line c-c. Stops a and b are provided to eliminate uncertainty of motion of the mechanism when it passes through its uncertain (dead-centre) position. The motion of connecting rod 2 can be reproduced by the rolling of circle d without slipping around fixed circle e, the radii of the circles being in the proportion A͞B:D͞C. The full stroke S of slider 3 is equal to four times the length of crank 1.
$1484$SC,4L$