Abstract: A road block having an extensible bollard that is manually or electronically actuated by a powerful spring force for slow extension, and by both the spring and a power lift for rapid extension.

Abstract: A pair of channel members are fastened by lag bolts between the rails, and a single channel member is fastened on each outer side thereof, each channel member being formed of a pair of U-shaped steel channels welded together in side by side relationship. A metal plate is welded across the upper, open portions of each channel member, the upper surface of the metal plates being coated with epoxy and a non-skid aggregate.

Abstract: A fluid motor actuator, including a hydraulic cylinder, includes a cam which is extended to become engagable with a cam follower of an extension chute section which is hinged and folded within a first chute section during transport. When the cam engages the follower of the retracted extension chute section, the cam causes the extension section to pivot out of its retracted position so that both chute sections form a unitary elongated chute adapted for receiving and directing the flow of concrete from the bowl of the mixer to the construction site. The extension chute section is retracted when the pour is completed and the cam is moved to non-interfering relation with the chute against the yieldable resistance of a spring.