Workbench apparatus, particularly for working on diesel engine injection pumps

A workbench apparatus for working on articles, particularly Diesel injection pumps, comprising a base and means supported by said base for carrying an article to be worked on, said means comprising at least one connection element having article supporting members for fixedly engaging said article and rigid insertion members in form of pins, and at least one clamping device rotatably supported by said base to be fixable thereon at different angular positions, said clamping device having a plurality of seats for receiving said pins of said at least one connection element and means for clamping said pins in said seats, wherein said pins are arranged on said at least one connection element according to directions forming angles between each other and said seats are arranged in said clamping device at positions such as to receive selected of said pins to allow positioning of said at least one connection element and article at plural angled positions with respect to said clamping device, and wherein said clamping device comprises a clamping block rotatably supported by said base, said clamping block comprising a shaped element having said seats machined therein such as to be partially open laterally, and clamp members for clampingly engaging said pins in said seats at points where said seats are open.