Bridge scaffold apparatus

Claim 1

A SCAFFOLD APPARATUS FOR USE ON AN ELEVATED ROADWAY COMPRISING AN ELONGATED UPSTANDING MOBILE FRAME ADAPTED TO STRADDLE AND REST UPON AN ELEVATED ROADWAY, A VERTICALLY DISPOSED SUPPORT MEMBER MOUNTED ON EACH END OF SAID MOBILE FRAME AND HAVING A PORTION EXTENDING BELOW SAID MOBILE FRAME, THE LOWER END OF SAID MOBILE FRAME EXTENDING VERTICALLY BENEATH THE ROADWAY, A HORIZONTALLY DISPOSED WALKWAY ON EACH SAID SUPPORT MEMBER NORMALLY DISPOSED AT SMALL ANGLES WITH OR IN LONGITUDINAL ALIGNMENT WITH RESPECT TO SAID FRAME AND WITH ONE END ADJACENT THE LOWER END OF SAID SUPPORT MEMBER, MEANS CONNECTING SAID ONE END OF EACH SAID WALKWAY TO SAID SUPPORT MEMBER FOR SWINGING MOVEMENT OF SAID WALKWAY FROM THE NORMAL POSITION BELOW AND IN LONGITUDINAL ALIGNMENT TO SAID FRAME TO A POSITION PERPENDICULAR TO SAID FRAME, EACH SAID WALKWAY, WHEN SAID MOBILE FRAME STRADDLES AND RESTS UPON AN ELEVATED ROADWAY, BEING OF A LENGTH TO EXTEND ACROSS AND BELOW SAID ROADWAY AND ADAPTED TO SUPPORT WORKMEN THEREON FOR THE PURPOSE OF TREATING THE UNDERSIDE OF SAID ROADWAY, AND HAND OPERATED MEANS FOR PROPELLING SAID MOBILE FRAME ALONG SAID ROADWAY WHEN RESTING THEREON.