Abstract: An erection hinge for use in erecting columns for open air structures utilizes a mounting plate which removably attaches to the foundation of such structures and which supports an offset hinge. The offset hinge carries a cradle which supports a column to be erected. A gin pole and rigging attached to the cradle or column translates simple linear force into a pivotal motion of the column and cradle on the hinge to position the column on its foundations.

Abstract: A portable suspended scaffold utilizes a carriage having circumferentially grooved rollers which engage upturned flanges on a set of purlins. A suspension structure depends from the carriage such that workers may affix overhead fixtures such as roof panels to the purlins above the scaffold. The scaffold utilizes a plurality of platform elements which are removably carried by the suspension structure such that the scaffold may be manually propelled along the length of the purlin without having the workers thereon dismount.

Abstract: A positioner for a movable window sash embodies a guide bracket carried by the sash with one side of the guide bracket spaced from and facing an adjacent side of a window frame and extending in a plane which is inclined relative to a plane extending in the direction of movement of the sash with the opposite side of the guide bracket being parallel to said one side thereof. A wedge-like member has a first surface in sliding engagement with said one side of the guide bracket. A second surface of the wedge-like member extends parallel to and faces the adjacent side of a window frame and is movable into and out of engagement with the window frame in response to sliding movement of the wedge-like member in opposite directions. An actuator mounted for sliding movement along said opposite side of the guide bracket is operatively connected to the wedge-like member to move it in opposite directions. A resilient member urges the wedge-like member into engagement with the adjacent side of the window frame.