Sughrue, Mion, Zinn, Macpeak and Seas
Molding device for modular concrete unit
 A molding device includes a multi-sided contractible inner form and outer forms that can be connected detachably to the inner form. The inner form has, at each side, a wedge-shaped spacer formwork board, on which are mounted a power means and a linkage mechanism, disposed between and connected detachably to left and right component formwork boards. The wedge-shaped spacer boards in all sides of the inner form can be pulled inward by individual power means through individual linkage mechanisms to leave space for the left and right component formwork boards to approach one another at all sides to contract the entire inner form. 
E
E04G
inventional
Yuan H.
Lee