Suspension support device for an outer wall working machine

A suspension support device adapted to be movably mounted on the upper surface of a building for suspending, by means of ropes, an outer wall working machine having a fitting and moving member which can be fittedly engaged in a pair of guide grooves formed vertically on an outer wall surface of said building, said guide grooves being provided for guiding said outer wall working machine along said outer wall surface, said suspension support device comprising:

• a main body comprising a movable base capable of moving on the upper surface of the building, a rotary body provided on the movable base rotatably about a vertical first axis and a winding device for taking up and feeding out the ropes;
• a pivotable arm supported on the main body pivotably about a vertical second axis;
• a holding unit provided on the foremost end portion of the pivotable arm rotatably about a vertical third axis and including a pair of holding guide members provided at an interval equal to an interval of the pair of guide grooves and capable of receiving the fitting and moving members;
• a rolling-contact type bearing including an outer race and an inner race which are rotatable relative to each other, said rotary body being supported on said movable base through said bearing and either an outer peripheral portion of the outer race or an inner peripheral portion of the inner race being formed as a toothed-wheel;
• a driving toothed-wheel, which is rotatable on an axis, provided in meshing engagement with the toothed-wheel of said rolling-contact type bearing, said driving toothed wheel being divided into two wheels across said axis;
• drive means for driving and rotating said driving toothed-wheel and having a rotary shaft to which one of the two wheels of said driving toothed-wheel being fixed and to which the other of the two wheels being rotatably mounted;
• and
• energizing means for energizing the other of the two wheels of said driving toothed-wheel with a predetermined force to rotate relative to said one of the two wheels and thereby increase the width of teeth of said driving toothed-wheel for eliminating backlash between the toothed-wheel of the rolling-contact type bearing and the driving toothed-wheel.