Swing clamp

A swing clamp apparatus adapted to be mounted adjacent a work surface and operable to clamp a work article against the work surface in order for work to be carried out on the article, the apparatus comprising:

• a housing including a bore defining a longitudinal axis, a mounting flange extending outward from the housing in a direction perpendicular to the longitudinal axis, and means for permitting the apparatus to be mounted relative to the work surface in any one of the plurality of different positions;
• a piston received within the bore and being movable in the direction of the longitudinal axis, the piston being in sealing engagement with the housing to divide the bore into first and second bore regions;
• a clamping arm supported on the piston for movement therewith between a clamping position in which the arm moves toward the work surface to permit clamping of a work article against the work surface and a releasing position in which the arm moves away from the work surface to release the work article;
• a first passageway for delivering pressurizing fluid from a source of pressurized fluid to the first bore section of the housing to move the piston in a first direction between the clamping and releasing positions;
• shifting means for shifting the piston in a second direction opposite the first direction between the clamping and releasing position;
• the passageway including a first plurality of external ports formed in the flange and a first manifold with which the first plurality of ports communicate to permit pressurizing fluid to be delivered to the first passageway;
• and
• plugging means for plugging any of the plurality of ports not used during delivery of pressurizing fluid to the passageway in order to prevent leakage of fluid from the manifold;
• the shifting means including a second passageway for delivery pressurizing fluid from the source of pressurized fluid to the second bore section of the housing to move the piston in the second direction between the clamping and releasing positions, the second passageway including a second plurality of external ports formed in the flange and a second manifold with which the second plurality of ports communicate to permit fluid to be delivered to the second passageway,
• wherein the flange includes a plurality of contiguous surfaces, and one of the first external ports and one of the second external ports are formed in at least two of the contiguous surfaces.