Abstract: The combined ballast apparatus provides dual function, as both slave ballast and emergency battery ballast, without the expense of a dual installation of ballast onto or into a light fixture. The apparatus is further designed for best efficiency in mounting and in service and removal. The mount holes and quick clips provide for installation to existing fixtures without the need for screwdrivers, for example. The quick connects allow the apparatus to be quickly plugged and unplugged from a light fixture, without having to strip wires and use wire nuts or the like. If equipped with the apparatus and needing a ballast change, the fixture is serviced in a matter of perhaps ¼ to ? the time previously required, without the litter.

Abstract: A butterfly valve disc has a circular cross-section bore for receiving the end of a drive shaft which engages with a member non-rotatably located in the bore. The member is polygonal and preferably formed with twelve sides and edges, the edges biting into the internal surface of the bore to prevent rotation. The member preferably is of harder alloy than the disc to resist wearing and is formed with a slot extending perpendicularly to the plane of the disc to receive a corresponding tongue formed at the end of the shaft. This arrangement allows a small degree of play so that if the disc is subjected to pressure on one side and therefore bends, the torque required to open the valve is not increased. Alternatively wherein the disc (or another component) is not subject to such pressure the member may be integrally formed with the shaft.

Abstract: A butterfly valve disc has a circular cross-section bore for receiving the end of a drive shaft which engages with a member non-rotatably located in the bore. The member is polygonal and preferably formed with twelve sides and edges, the edges biting into the internal surface of the bore to prevent rotation. The member preferably is of harder alloy than the disc to resist wearing and is formed with a slot extending perpendicularly to the plane of the disc to receive a corresponding tongue formed at the end of the shaft. This arrangement allows a small degree of play so that if the disc is subjected to pressure on one side and therefore bends, the torque required to open the valve is not increased. Alternatively wherein the disc (or another component) is not subject to such pressure the member may be integrally formed with the shaft.

Abstract: A valve disc and drive shaft assembly wherein the end of the drive shaft seats in a blind bore at the periphery of the valve disc. The end of the shaft or the base of the bore is formed with a tang, extending perpendicularly to the plane of the disc, seating in an elongated recess in the base of the bore or end of the shaft respectively.