Concrete block mold with parallel linkage means

Claim 1

A mold for casting concrete blocks comprising, two oppositely disposed fixed end walls, a fixed rear wall, a bottom floor, means for moving vertically said floor, a movable front wall engageable with edges of said fixed end walls, the inner surface of the movable wall being non-planar and constituting means for embossing indicia on the face of a block in the mold, rigid links in a parallel relationship pivotally connected to the ends of said movable wall and to each of said two fixed end walls, said links being disposed at an acute angle to the horizontal when the movable wall is engaged with said edges, the bottom edge of said movable wall resting on said bottom floor when the mold is closed, and said movable wall being movable away from the edges of the fixed walls, under control of said links, when said floor and movable wall are moved downward, said fixed walls having their bottom edges in a common plane, the bottom edge of said movable wall also lying in said common plane, and means for ejecting a block from the mold, said latter means being normally above the mold and having a part projecting over the upper edge of the front wall in a position to engage and move downward the movable front wall in synchronism with downward movement of the floor.