Abstract: This actuator switch assembly is used in conjunction with a concrete block machine and provides first and second switch portions, each attached to one of the height pins of the concrete block machine. Both switch portions include spring-loaded plungers and one of the portions includes a pair of electrical contacts which are closed by engagement of the plungers when the height bars approach each other.

Abstract: This core puller assembly includes a bank of interconnected core puller units each having a cylinder, and a piston mounted within the cylinder and having a rearwardly extending connecting rod. Each core puller unit includes a core puller bar disposed in side-by-side relation below the cylinder and connected to the piston connecting rod for movement with said connecting rod. Each cylinder carries front and rear guide units receiving the core puller bar in sliding relation to guide the core puller bars into the mold assembly.The cylinders are operated by a pneumatic air supply which includes a surge tank and a control system for controlling the supply of pressurized air to the cylinders.