Work table for a stepped platform

Claim 1

In a surface traversing apparatus adapted to be supported near a member for traversing the surface of the member by stepwise motion, the surface traversing apparatus including base means, first and second anchor means each movably connected to the base means for stepwise lateral relative motion in different respective directions, the first and second anchor means being selectively engageable with the member for resisting lateral motion relative thereto, first and second actuating means operatively connected to the first and second anchor means respectively and to the base means for moving the respective first and second anchor means laterally relative to one another in discrete steps, means to alternately engage the first and second anchor means with the member while the other of the anchor means is disengaged from the member so as to transport the first and second anchor means laterally relative to the other of the anchor means by the first or second actuating means respectively to move the first and second anchor means to new relative positions, the improvement wherein, a circular race is mounted on the base means with its center in substantial vertical alignment with the geometrical center of the base means, a work table in the form of a circular flange and positioned concentric the race, a plurality of guide wheels spaced at fixed positions between the race and table so as to enable the table to rotate relative the race in a plane parallel the surface of the member, motor means connected between the race and table to rotate the table to selected positions relative to the surface traversed by the base, and tools mounted at stations on the work table, whereby each tool is positioned in a desired sequence over the same location on the surface of the member to carry out work on the same surface structure.