Abstract: The present invention provides a system to quickly and easily employ a thermal/wind barrier over the surface of a mechanical dock leveler. Dock levelers used in structures with loading docks allow air transfer and thermal conductivity into the loading dock area from the outside environment through joints and openings in and around the dock leveler, when the leveler is not in use, causing economic loss of climate controlled air. The present invention provides a system to employ a thermal/wind barrier over the surface of a dock leveler when it is not being used, so as to prevent this loss. The barrier is deployed and retracted by use of a detent clutch operated spooling mechanism. The spooling mechanism is enclosed in a housing which is mounted to the inside, bottom surface of a loading dock door. An alternative embodiment uses an electric motor to deploy and retract the barrier.

Abstract: Method and hardware for multiple distributing business or residential telephone connections and multiple Ethernet data connections over a standard 4 twisted pair telephone cable system.

Abstract: A displaceable purifier body improves the delivery of high purity gases from gas tanks or cylinders by providing a large flow area for filling the cylinder or tank with gas while preventing contamination of gases during the filling procedure and by automatically engaging the purifier for purification when withdrawing gas from the tank or cylinder. The purifier body or a separate seal body has an arrangement for reciprocal movement between a filling position wherein the gas entering the cylinder by-passes the purifier body and an engaged position wherein the purifier body moves towards the cylinder head assembly to prevent by-passing of exiting gases around the purifier. This arrangement offers little restriction to gas flow entering the cylinder and allows rapid filling of cylinders to make gas delivery more economical.