Abstract: A tool for manipulating suspended display holders such that a user can mount suspended displays on and remove suspended displays from an overhead support structure from floor level is provided. The tool includes an elongate handle having an upper end on which is arranged a gripping head. The gripping head includes a channel portion which can be brought into engagement with a suspended display holder and a clamp member which is mounted on the gripping head for sliding movement between a position wherein the gripping head engages the suspended display holder and a retracted released position. The slide member is biased towards the engaged position by a spring which is provided on the gripping head. The tool also includes an actuating cord which can be used to effect movement of the clamp member between the engaged and retracted positions.

Abstract: A suspended display holder is provided for securing a display to a base with magnetic attraction. The holder includes an elongate support unit which subtends the base, a magnet unit provided on the support unit and in selective magnetic engagement with the base, and a removable hanger assembly mounted on the support unit and supportingly engaging a display.

Abstract: Methods and apparatus for attaching a sign element to a base with a frameless magnetically attractive support system.

Abstract: Methods and apparatus for attaching a sign element to a base with a frameless magnetically attractive support system.

Abstract: A labyrinth seal has two relatively rotatable members which are configured to define between them a succession of annular orifice or clearances between seal knives on one member and generally cylindrical surfaces or lands on the other. The members define a doubly recurved flow path from each orifice to the orifice next downstream. The first reversal of flow is effected by a barrier at the downstream end of the land having a hemi-toroidal surface to deflect the flow back toward the orifice. Flow is again reversed in passing around the barrier and flows between the barrier and the other seal member to the next downstream orifice. A ring of slots through the barrier tangential to the hemi-toroidal surface discharges some of the flow into the twice reversed flow so as to provide an aerodynamic dam to increase turbulence and reduce the flow area and, therefore, increase pressure drop and sealing effectiveness.