Abstract: A sandwich stacker for grasping, rotating and stacking one half of a bisected sandwich on the other half. The stacker includes a half-sandwich gripper. A selectively actuable rotator is coupled to the gripper. The gripper is adapted to releasably hold a first half-sandwich of a bisected sandwich. The rotator selectively rotates the gripper about a first axis of rotation for stacking the first half-sandwich on the other half of the sandwich. The stacker is adapted to be coupled to a positioning device, such as a robotic arm. The rotator may be mounted on the stacker or on the positioning device. The first axis of rotation may be through a center of mass of the first half-sandwich when held by the gripper, or through a cut-line bisecting the bisected sandwich when the first half-sandwich is first held by the gripper.

Abstract: The present invention provides an air distributing manifold that is positioned and operative within the interior of the debris holding tank of the hydrovac system. The air distributing manifold can be configured to aid in the recirculating of the airflow within the debris holding tank prior to exit from the tank, thereby enhancing the precipitation of entrained particulates within the air stream.