| One of the window cleaning equipments
is the powered platform, “swing stage” or ‘stage”,
which is a work platform, whose frame is typically constructed of aluminum.
The stage is vertically propelled using electrically powered motor(s),
either traction hoist or drum type, on board. Compressed air powered hoists
are occasionally used in lieu of electrical power. The platform, suspended
by at least two independent wire ropes of 5/16 inch diameter or greater,
may be as short as three feet for a single man cage, or as long as forty
feet, carrying three men plus tools, equipment and supplies.
Whether “ground rigged” or “roof
rigged”, the stage and its electrical cord are suspended from one
of several types of roof top supports, including: davits; rolling roof
carriage; outriggers; “drop thru” sleeves; monorail track;
parapet clamps or parapet hooks. Each of these supporting devices is elaborated
upon in subsequent paragraphs.
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