Large umbrella has top ring connected by push rods to handle sliding along channels let into circumference of mast, which can also be used for e.g. wiring, lighting and heating

摘要

The top ring (18) is connected by push rods (34) to a handle (36) which slides upon and is guided along the mast (10). In the circumference of the mast there are a number of undercut channels (48) running longitudinally. The channels guide push rods (34). Some of the channels provide for installation of e.g. wires, electric lights and heaters.