Patent ID: 10392852

Abstract:
A door opening and closing operating system includes a pressurized fluid source (102), two fluid control push pull valves (144a), (144b), and a double acting cylinder (160) which is mounted to the movable element of a door (66) mounted within its adjacent frame (62) for the purpose of opening and closing the door. This system utilizes two push pull valves connected fluid-wise to opposite sides of the piston. Activating or energizing one push pull valve while deactivating the second push pull valve connects the first cylinder chamber to the pressurized fluid source, and vents the second chamber, thereby pushing the piston in a first direction, which pushes the door in a first direction. Energizing the second push pull valve and de-energizing the first push pull valve has the opposite effect, and moves the piston and attached door in a second direction opposite the first direction.