Link 2, designed as a wedges, slides along fixed guides a-a and is connected by sliding pair c-c to link 1 which slides along fixed guides b-b. Link 1 moves up or down when link 2 is moved to the right or left. Set screws 3 and 4, locked by nuts, limit the stroke of wedge 2 and thereby also limit the stroke of link 1.
$2166$WL,3L$